Document:

EX-10.6

 Exhibit 10.6 

NASA AMES RESEARCH CENTER 

ENHANCED USE LEASE 

Basic Lease Information 
 Date:
December 5, 2011. 
 Landlord: NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, an Agency of the United States, Ames Research Center located at Moffett
Field, California. 
 Tenant: BLOOM ENERGY CORPORATION, a Delaware corporation. 

Premises (section 1.1): (a) The parcel of real property outlined in Exhibit A, containing approximately 73,939 square feet (more or less) of land
area, including Building 543 (containing approximately 9,166 square feet (more or less) of building space (“Building 543”)) and all other improvements owned by Landlord thereon (collectively, the “Building 543 Premises”); and
(b) all of the space in Building 154 (“Building 154”) outlined in Exhibit A-1, containing approximately 14,359 square feet (more or less) of building area (the “Building 154 Premises”). The Building 543 Premises and
the Building 154 Premises are located at NASA Ames Research Center, Moffett Field, California. A site plan showing the locations of the Building 543 Premises and the Building 154 Premises is attached hereto as Exhibit A. Building 543 and
Building 154 are individually referred to herein as a “Building” and are collectively referred to herein as the “Buildings.” 
 Property
(section 1.1): The land, the buildings and other improvements known as NASA Ames Research Center, Moffett Field, California 94035-1000. 
 Term (section
2.1): Approximately three (3) years. 
 Commencement Date (section 2.1): December 16, 2011. 

Expiration Date (section 2.1): December 31, 2014. 

Monthly Base Rent (dollars per month) (section 3.1): $40,967.86; provided, however, during the month during which the TI Period (as defined in section 1.3)
occurs, the monthly Base Rent for the Premises shall be reduced to $32,687.50 (because the monthly Base Rent for the Building 154 Premises shall be reduced to $1,986.33 during such TI Period). 

Security Deposit (section 3.3): $40,500.00. 

  

					
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	Rent Payment Address (section 3.7):	  	 NASA Shared Service Center (NSSC)-
 FMD Accounts
Receivable
 Attn: For the Accounts of Ames Research Center

(Agreement #SAA2-402658)
 Bldg. 1111, C Road

Stennis Space Center, MS 39529

 Permitted Use of the Premises (section 4.1): Bloom Energy will use and occupy the Building 543 Premises solely for research
and development, and testing, including as its research laboratory and to test its products. Bloom Energy will use and occupy the Building 154 Premises solely for office purposes; provided, however, Bloom Energy may use rooms 124, 125, 126, 128, 129
and 130 for minor assembly of wiring harnesses and piping. 
  

			
	Landlord’s Address (section 14.1):	  	 NASA Ames Research Center
 Ms. Mejghan K.
Haider, Mail Stop 204 – 2
 Bldg. 204, Rm 215
 P.O. Box
1
 Moffett Field, CA 94035-0001

		
	Tenant’s Address (section 14.1):	  	 Bloom Energy Corporation
 1252 Orleans Drive

Sunnyvale, CA 94089
 Attn: Mr. William H. Kurtz

 Exhibit A – Site Plan; Plan Outlining the Building 543 Premises 

Exhibit A-1 – Plans Outlining the Building 154 Premises 

Exhibit B – Description of the TI Work 
 Exhibit C –
Support Agreement 
 Exhibit D – List of Environmental Reports 

The foregoing Basic Lease Information is incorporated in and made a part of the Lease to which it is attached. If there is any conflict
between the Basic Lease Information and the Lease, the Basic Lease Information shall control. 
  

									
	Tenant:	 		 	Landlord:
			
	 BLOOM ENERGY CORPORATION, a

Delaware corporation
	 		 	 NATIONAL AERONAUTICS AND
 SPACE
ADMINISTRATION, an
 Agency of the United States

					
	By	 	/s/ William H. Kurtz	 		 	By	 	/s/ S. Pete Worden
		 	William H. Kurtz	 		 		 	S. Pete Worden
		 	Chief Financial Officer	 		 		 	Director, Ames Research Center

  

					
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 TABLE OF CONTENTS 

 

							
	 Article
	 	 	  	Page	 
		
	 ARTICLE 1 PREMISES
	  	 	2	 
			
	 1.1
	 	LEASE OF PREMISES	  	 	2	 
	 1.2
	 	TERMINATION oF EXISTING LEASES	  	 	2	 
	 1.3
	 	TENANT IMPROVEMENT WORK	  	 	3	 
	 1.4
	 	UA LEASE	  	 	3	 
	 1.5
	 	COMMON AREAS	  	 	4	 
		
	 ARTICLE 2 TERM
	  	 	4	 
			
	 2.1
	 	TERM oF LEASE	  	 	4	 
	 2.2
	 	POSSESSION	  	 	4	 
	 2.3
	 	HOLDING OVER	  	 	5	 
		
	 ARTICLE 3 RENT
	  	 	5	 
			
	 3.1
	 	MONTHLY BASE RENT AND ADDITIONAL RENT	  	 	5	 
	 3.2
	 	PROCEDURES	  	 	6	 
	 3.3
	 	INITIAL PAYMENT; SECURITY DEPOSIT	  	 	6	 
	 3.4
	 	LATE PAYMENT	  	 	7	 
	 3.5
	 	TAXES PAYABLE BY TENANT	  	 	7	 
	 3.6
	 	CERTAIN DEFINITIONS	  	 	8	 
	 3.7
	 	RENT PAYMENT ADDRESS	  	 	8	 
		
	 ARTICLE 4 USE OF THE PREMISES
	  	 	8	 
			
	 4.1
	 	PERMITTED USE	  	 	8	 
	 4.2
	 	ENVIRONMENTAL DEFINITIONS	  	 	9	 
	 4.3
	 	ENVIRONMENTAL REQUIREMENTS	  	 	9	 
	 4.4
	 	COMPLIANCE WITH LAW	  	 	10	 
	 4.5
	 	RULES AND REGULATIONS	  	 	11	 
	 4.6
	 	ENTRY BY LANDLORD	  	 	11	 
		
	 ARTICLE 5 UTILITIES AND DEMAND SERVICES
	  	 	12	 
			
	 5.1
	 	LANDLORD’S RESPONSIBILITIES	  	 	12	 
	 5.2
	 	TENANT’S RESPONSIBILITIES	  	 	13	 
		
	 ARTICLE 6 MAINTENANCE AND REPAIRS
	  	 	13	 
			
	 6.1
	 	OBLIGATIONS OF LANDLORD	  	 	13	 
	 6.2
	 	OBLIGATIONS OF TENANT	  	 	14	 
		
	 ARTICLE 7 ALTERATION OF THE PREMISES
	  	 	14	 
			
	 7.1
	 	NO ALTERATIONS BY TENANT	  	 	14	 
	 7.2
	 	TENANT’S PROPERTY	  	 	15	 
		
	 ARTICLE 8 INDEMNIFICATION AND INSURANCE
	  	 	16	 
			
	 8.1
	 	DAMAGE OR INJURY	  	 	16	 
	 8.2
	 	INSURANCE COVERAGES AND AMOUNTS	  	 	16	 
	 8.3
	 	INSURANCE REQUIREMENTS	  	 	17	 
	 8.4
	 	SUBROGATION	  	 	18	 
		
	 ARTICLE 9 ASSIGNMENT OR SUBLEASE
	  	 	19	 
			
	 9.1
	 	PROHIBITION	  	 	19	 
	 9.2
	 	LANDLORD’S CONSENT OR TERMINATION	  	 	20	 

  

					
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 TABLE OF CONTENTS 

 

							
	 Article
	 	 	  	Page	 
	 9.3
	 	COMPLETION	  	 	20	 
	 9.4
	 	TENANT NOT RELEASED	  	 	20	 
		
	 ARTICLE 10 EVENTS OF DEFAULT AND REMEDIES
	  	 	21	 
			
	 10.1
	 	DEFAULT BY TENANT	  	 	21	 
	 10.2
	 	TERMINATION	  	 	22	 
	 10.3
	 	CONTINUATION	  	 	22	 
	 10.4
	 	REMEDIES CUMULATIVE	  	 	22	 
	 10.5
	 	TENANT’S PRIMARY DUTY	  	 	22	 
	 10.6
	 	ABANDONED PROPERTY	  	 	22	 
	 10.7
	 	LANDLORD DEFAULT	  	 	23	 
	 10.8
	 	LANDLORD’S RIGHT TO TERMINATE	  	 	23	 
		
	 ARTICLE 11 DAMAGE OR DESTRUCTION
	  	 	23	 
			
	 11.1
	 	RESTORATION	  	 	23	 
	 11.2
	 	TERMINATION OF LEASE	  	 	24	 
		
	 ARTICLE 12 EMINENT DOMAIN
	  	 	24	 
			
	 12.1
	 	CONDEMNATION	  	 	24	 
	 12.2
	 	AWARD	  	 	25	 
	 12.3
	 	TEMPORARY USE	  	 	25	 
	 12.4
	 	DEFINITION OF TAKING	  	 	25	 
		
	 ARTICLE 13 SUBORDINATION AND SALE
	  	 	25	 
			
	 13.1
	 	SUBORDINATION	  	 	25	 
	 13.2
	 	SALE OF THE PROPERTY	  	 	26	 
	 13.3
	 	ESTOPPEL CERTIFICATE	  	 	26	 
		
	 ARTICLE 14 NOTICES
	  	 	26	 
			
	 14.1
	 	METHOD	  	 	26	 
	 14.2
	 	CLOSE CALLS AND MISHAPS	  	 	27	 
		
	 ARTICLE 15 MISCELLANEOUS
	  	 	27	 
			
	 15.1
	 	GENERAL	  	 	27	 
	 15.2
	 	NO WAIVER	  	 	28	 
	 15.3
	 	EXHIBITS	  	 	28	 
	 15.4
	 	BROKER(S)	  	 	28	 
	 15.5
	 	WAIVERS OF JURY TRIAL AND CERTAIN DAMAGES	  	 	28	 
	 15.6
	 	ENTIRE AGREEMENT	  	 	28	 
	 15.7
	 	GOVERNING LAW	  	 	28	 
	 15.8
	 	CONFIDENTIALITY	  	 	29	 
	 15.9
	 	ANTI – DEFICIENCY ACT	  	 	29	 

 Exhibit A – Site Plan; Plan Outlining the Building 543 Premises 

Exhibit A-1 – Plans Outlining the Building 154 Premises 

Exhibit B – Description of the TI Work 
 Exhibit C –
Support Agreement 
 Exhibit D – List of Environmental Reports 

  

					
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 NASA AMES RESEARCH CENTER 

ENHANCED USE LEASE 
 This
NASA Ames Research Center Enhanced Use Lease of (the “Lease”) is made as of the date specified in the Basic Lease Information, by and between the NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, an Agency of the United States
(“Landlord”), Ames Research Center located at Moffett Field, California, and the tenant specified in the Basic Lease Information (“Tenant”). This Lease is made under the authority of section 315 of the National Aeronautics
and Space Act, as amended (51 U.S.C. §20145), with reference to the following facts: 
 R E C I T A L S 

A. Landlord is committed to using its resources to the greatest public benefit and thus will take advantage of its unique research
capabilities, stock of land, buildings and existing partnerships with state and local government, academia, industry and private organizations to create a center in which Landlord, its collaborative partners and the public can jointly work to
advance: astrobiology; biotechnology; robotics; lunar exploration; technologies for NASA’s space exploration system (SLS and MPCV); the search for habitable planets; supercomputing; intelligent/adaptive systems; advanced thermal protection;
airborne astronomy; science and technology education; the dissemination of information concerning Landlord’s activities; and the commercial use of Landlord’s basic research by the private sector. 

B. In furtherance of Landlord’s missions, this Lease furthers the development of a collaborative research environment on the Property (as
defined in section 1.1) in which Landlord, industry and academia are co-located to further foster research related to the activities described in Recital A above, as well as other research activities in furtherance of the goals and missions of both
Landlord and Tenant. Landlord’s signatory hereby certifies that this Lease will not have a negative impact on NASA’s mission. 

C. Landlord and Tenant previously entered into the following leases (collectively, the “Existing Leases”): (a) NASA Ames
Research Center Enhanced Use Lease, dated as of May 14, 2004 (SAA2-401733), as amended (collectively, the “Building 543 Lease”); (b) NASA Ames Research Center Enhanced Use Lease of Unimproved Real Property, dated as of
June 4, 2008 (SAA2-402120), as amended (collectively, the “Land Lease”); and (c) NASA Ames Research Center Enhanced Use Lease of Historic Property, dated as of August 5, 2009 (SAA2-402379), as amended (collectively, the
“Building 19 Lease”). Tenant desires to relocate its personnel from the premises demised under the Building 19 Lease and from the temporary office trailer installed by Tenant on the property demised under the Land Lease to the Building 154
Premises (which is near the Building 543 Premises), thus more conveniently locating Tenant’s personnel and facilities leased at the Property. 

D. In addition the parties desire to replace the Existing Leases with this Lease. The Building 543 Lease and the Land Lease will be terminated
concurrently with the Commencement Date (as defined in section 2.1). The Building 19 Lease will be terminated on the last day of the TI Period (as defined in section 1.3). 

  

					
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 E. Accordingly, Landlord has agreed to lease the Premises (as defined in section 1.1) on the
terms and conditions set forth in this Lease and for the purposes provided herein to facilitate the development and long-term operation of a collaborative research environment on the Property and to provide support to various activities in support
of this goal. All collaborative efforts between Landlord and Tenant will be documented in separate agreements. The parties acknowledge and agree that the Premises are not being provided to Tenant as government furnished property under any contract
or subcontract, and Tenant agrees that it shall not charge or submit for payment any rent (as defined in section 3.1 (d)) as a direct or indirect cost or charge under any such contract or subcontract. 

NOW, THEREFORE, the parties agree as follows. 

ARTICLE 1 
 Premises

 1.1 Lease of Premises. Landlord hereby leases to Tenant, and Tenant hereby leases from Landlord, for the Term (as defined in
section 2.1 and subject to the covenants hereinafter set forth, the Building 543 Premises and the Building 154 Premises, all as specified in the Basic Lease Information (collectively, the “Premises”) located at NASA Ames Research
Center, Moffett Field, California 94035-1000 (the “Property”). The Premises are outlined on the plans attached hereto as Exhibits A and A-1. Landlord and Tenant agree that, for purposes of this Lease, the Premises and the Buildings
each contains the number of square feet of land area and building area specified in the Basic Lease Information. The parties acknowledge and agree that Tenant installed certain improvements, fixtures and equipment on portions of the Building
543 Premises pursuant to the Building 543 Lease. Landlord agrees that Tenant may continue to maintain and use such improvements, fixtures and equipment pursuant to this Lease. Notwithstanding the foregoing, Tenant shall not use, and shall not allow
its employees, contractors, licensees, agents or invitees to use, any portion of the Building 543 Premises within a seventy-five (75) foot radius of Tenant’s existing hydrogen tank area as more particularly shown and designated as the
“Restricted Area” on attached Exhibit A. Without limiting the foregoing, Tenant agrees that no motor vehicle parking, employee recreational areas (such as picnic tables or lunch areas) or other improvements or structures shall be
allowed within the Restricted Area. Tenant shall not install or place any improvements, fixtures or personal property within the Restricted Area. Notwithstanding the foregoing provisions regarding the Restricted Area, Tenant may install a portion of
its test pad improvements within the Restricted Area so long as such improvements do not include any utility connections and Landlord approves the same. 

1.2 Termination of Existing Leases. Landlord and Tenant hereby agree that the Building 543 Lease and the Land Lease shall automatically
terminate as of the Commencement Date, and that the Building 19 Lease shall automatically terminate as of the last day of the TI Period. Concurrently with executing this Lease, the parties shall execute agreements evidencing the foregoing
terminations in to fulfill Landlord’s real property records and reporting requirements. 

  

					
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 1.3 Tenant Improvement Work. Tenant desires to perform certain tenant improvement work in
Building 154, which work is generally described on attached Exhibit B (the “TI Work”). Tenant shall: (a) commence the TI Work on the Commencement Date; (b) diligently prosecute the same to completion; (c) comply with
all Applicable Laws (as defined in section 4.4); (d) obtain all necessary permits and approvals (including as set forth in section 7.1); and (e) use its reasonable efforts to complete the TI Work as quickly as possible thereafter, which is
expected to occur during the TI Period. Subject to compliance with the terms and conditions of this Lease (including the obligation to obtain permits, if applicable), Landlord hereby consents to the Tenant performing the TI Work. During the TI
Period, Landlord has agreed to reduce the monthly Base Rent applicable to the Building 154 Premises as set forth herein. If the TI Work is not completed during the TI Period, Tenant may continue to perform the TI Work thereafter; provided, however,
Tenant shall pay the full monthly Base Rent with respect to the Building 154 Premises, and the Building 19 Lease and the Land Lease shall nevertheless terminate effective on the last day of the TI Period. As used in this Lease, the phrase “TI
Period” means the period of time beginning on the Commencement Date and ending on the earlier of: (a) the date on which NASA’s Chief Building Official issues to Tenant a final certificate of occupancy for the Building 154 Premises
following completion of the TI Work; or (b) fifteen (15) days following the Commencement Date. In addition to the TI Work, on or before the last day of the TI Period, Tenant shall remove from the Property the portable office trailer that
Tenant installed on the parcel of land demised under the Land Lease. 
 1.4 UA Lease. 

(a) Tenant understands that the United States Government (“Government”) has leased the real property on which the Buildings are
located, together with all of the improvements thereon, to University Associates-Silicon Valley LLC, a Delaware limited liability company (“UA”), pursuant to that certain Enhanced Use Lease dated as of December 12, 2008, as amended
(such amended lease, as it may be further amended or modified during the Term, is referred to herein as the “UA Lease”). Tenant’s lease of the Premises is subject and subordinate to all of the terms and conditions of the UA Lease.
Tenant acknowledges that the UA Lease is available at Landlord’s “electronic reading room”: 

http://www.nasa.gov/centers/ames/business/foia/elec.html. 

(b) Pursuant to the UA Lease, Landlord retains the beneficial use and occupancy of the premises demised to UA (the “UA Premises”)
until such time as UA requires possession of all or any portion of the UA Premises, in which event Landlord is obligated to deliver possession thereof free and clear of all existing tenancies and occupancies. Accordingly, and in addition to
Landlord’s other rights to terminate set forth in this Lease, Tenant agrees that this Lease shall terminate with respect to, and Tenant shall vacate and surrender possession of, all or any portion of the Premises, within one hundred twenty
(120) days after Landlord delivers to Tenant written notice (a “UA Termination Notice”) if UA requires possession of the portion of the UA Premises on which the applicable portion(s) of the Premises is located prior to the Expiration
Date. In addition, if Landlord’s UA Termination Notice applies to less than all of the Premises, Tenant will have the right to terminate this Lease as to all or any other portion of the Premises as Tenant shall designate by delivering to
Landlord written notice exercising such termination right within thirty (30) days of the date of such UA Termination Notice, which termination shall be effective as of the date set specified in Tenant’s written notice to Landlord
exercising such termination right. 

  

					
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 1.5 Common Areas. During the Term, Tenant shall have the nonexclusive right, in common
with other tenants and users of the Property, to use only for their intended purposes the common areas (such as driveways, sidewalks, parking areas, loading areas and access roads) in the Property. Landlord shall have the right from time to time to
change the size, location, configuration, character or use of any such common areas, construct additional improvements or facilities in any such common areas, or close any such common areas so long as Tenant’s obligations under this Lease are
not materially increased nor its rights materially decreased. Tenant shall not interfere with the rights of Landlord and other tenants or users of the Property to use such common areas. 

ARTICLE 2 
 Term 

2.1 Term of Lease. The term of this Lease shall be the term specified in the Basic Lease Information (the “Term”),
which shall commence on the commencement date specified in the Basic Lease Information (the “Commencement Date”) and, unless sooner terminated as hereinafter provided, shall end on the expiration date specified in the Basic Lease
Information (the “Expiration Date”). If Landlord, for any reason whatsoever, does not deliver possession of the Premises to Tenant on the Commencement Date, this Lease shall not be void or voidable and Landlord shall not be liable to
Tenant for any loss or damage resulting therefrom, but, in such event, the Commencement Date shall be postponed until the date on which Landlord delivers possession of the Premises to Tenant, but the Expiration Date shall not be extended. Tenant
acknowledges that Tenant has inspected the Premises, the Buildings and the Property or has had the Premises, the Buildings and the Property inspected by professional consultants retained by Tenant, Tenant is familiar with the condition of the
Premises, the Buildings and the Property, the Premises, the Buildings and the Property are suitable for Tenant’s purposes, and the condition of the Premises, the Buildings and the Property is acceptable to Tenant. Tenant accepts the Premises in
its “AS IS” condition, with all faults, without any covenant, representation or warranty of any kind or nature whatsoever, express or implied (including with respect to the suitability of the Premises or any utility systems serving the
Premises for Tenant’s purposes), and Tenant is relying solely on its own investigation of the Premises, the Buildings and the Property. Tenant agrees that Landlord has made no representations or warranties concerning such conditions, state of
repair and use, nor any agreement or promise to alter, improve, adapt, repair or keep in repair the same, or any portion thereof. Landlord shall have no obligation to construct or install any improvements in the Premises, the Buildings or the
Property or to remodel, renovate, recondition, alter or improve the Premises, the Buildings or the Property in any manner. 
 2.2
Possession. Landlord shall deliver possession of the Premises to Tenant on the Commencement Date, and Tenant shall accept such delivery of the Premises. Notwithstanding section 2.1 and Tenant’s acceptance of the Premises, Tenant shall
not use or occupy the Premises until a certificate of occupancy and all other necessary approvals have been issued by Landlord and all other applicable governmental agencies. If a certificate of occupancy and all other

  

					
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necessary approvals have been issued by Landlord and all other applicable governmental agencies, and the Premises are ready for occupancy by Tenant prior to the Commencement Date, Tenant shall
have the right to take early occupancy of the Premises prior to the Commencement Date and the Term shall commence on such date of early occupancy by Tenant, in which event the Commencement Date shall be advanced to such date of early occupancy, but
the Expiration Date shall not be advanced. Tenant shall give Landlord written notice of Tenant’s determination to take early occupancy of the Premises at least ten (10) days in advance, which notice shall specify the date of such early
occupancy. 
 2.3 Holding Over. If, with consent by Landlord, Tenant holds possession of the Premises after expiration of the Term,
Tenant shall become a tenant from month to month under this Lease, but the Base Rent during such month to month tenancy shall be equal to one hundred fifty percent (150%) of the Base Rent in effect at the expiration of the Term. Landlord and
Tenant each shall have the right to terminate such month to month tenancy by giving at least thirty (30) days’ written notice of termination to the other at any time, in which event such tenancy shall terminate on the termination date set
forth in such termination notice. 
 ARTICLE 3 

Rent 
 3.1 Monthly Base
Rent and Additional Rent. Tenant shall pay to Landlord the following amounts as rent for the Premises: 
 (a) During the Term, Tenant
shall pay to Landlord, as monthly base rent, the amount of monthly Base Rent specified in the Basic Lease Information. 
 (b) During
each Government fiscal year (or part thereof) during the Term, Tenant shall pay to Landlord, as additional rent and in accordance with this Lease and the terms and conditions of the annual Support Agreement, the current form of which is attached
hereto as Exhibit C (each, a “Support Agreement”), the costs of Demand Services (as defined in section 3.6(a)) provided to Tenant by Landlord in such year. 

(c) The amount of monthly Base Rent shall be increased on January 1, 2013 and on each January 1 thereafter throughout the Term
(each, a “CPI Adjustment Date”) by the percentage increase in the CPI (as defined below) during the twelve (12) month period immediately preceding each CPI Adjustment Date (each such twelve (12) month period being referred to
herein as a “Lease Year”), which increase shall be determined as follows. The base for computing each increase in monthly Base Rent shall be the CPI published most immediately before the first day of the applicable Lease Year (a
“Beginning Index”), and the CPI published most immediately before the last day of the applicable Lease Year (an “Adjustment Index”) shall be used in determining the amount of the adjustment. If the Adjustment Index has increased
over the Beginning Index since the last CPI Adjustment Date, then the monthly Base Rent for the next Lease Year shall be increased by multiplying the amount of the last payment of monthly Base Rent by a fraction, the numerator of which is the
Adjustment Index and the denominator of which is the Beginning Index. As used in this Lease, the term “CPI” means the United States Department of Labor, Bureau of Labor Statistics, Consumer Price Index, All Urban Consumers, All Items, San
Francisco – Oakland – San Jose, California (1982 – 84 equals 100), or if such 

  

					
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index is no longer published, a successor or substitute index designated by Landlord, published by a governmental agency reflecting changes in consumer prices in the San Francisco Bay Area that
is most nearly comparable to the CPI. If the CPI is changed so that the base year differs from that in effect when the Initial Term commences, the CPI shall be converted in accordance with the conversion factor published by the United States
Department of Labor, Bureau of Labor Statistics. If the CPI is discontinued or revised during the Term, such other government index or computation with which it is replaced shall be used in order to obtain substantially the same result as would have
been obtained if the CPI had not been discontinued or revised. 
 (d) Throughout the Term, Tenant shall pay, as additional rent, all other
amounts of money and charges required to be paid by Tenant under this Lease, whether or not such amounts of money or charges are designated “additional rent.” As used in this Lease, “rent” shall mean and include all Base Rent,
all additional rent and all other amounts of money and charges payable by Tenant in accordance with this Lease. 
 3.2 Procedures.

 (a) Immediately following the execution of this Lease, Landlord and Tenant shall execute the initial Support Agreement. The current
amounts of monthly Base Rent and the current costs of Demand Services are set forth on the initial Support Agreement. Tenant understands that costs of Demand Services may increase in the future, and Tenant agrees to pay the costs of Demand Services
as determined by Landlord from time to time. 
 (b) Cost estimates for Demand Services, and reimbursement thereof, shall be consistent with
Applicable Laws and Landlord’s policy, including the requirement for payment in advance of the rate at which Landlord anticipates incurring costs. Landlord will review costs for Demand Services periodically to ensure that the rates are based on
actual costs to Landlord. 
 (c) If the Term commences or ends on a day other than the first or last day of the Government’s fiscal
year, respectively, the amounts payable by Tenant under section 3.1(b) applicable to the fiscal year in which such term commences or ends shall be prorated according to the ratio which the number of days during the Term in such fiscal year bears to
three hundred sixty—five (365). Termination of this Lease shall not affect the obligations of Landlord and Tenant pursuant to section 3.1(b) to be performed after such termination. 

3.3 Initial Payment; Security Deposit. Upon signing this Lease, Tenant shall pay to Landlord (a) an amount equal to the Base Rent
and Demand Services (if any) for the partial month (if any) during which the Commencement Date occurs and the first month of the Term, and (b) the amount of the security deposit specified in the Basic Lease Information (the
“Security Deposit”). The Security Deposit shall be held by Landlord as security for the performance by Tenant of all of the covenants of this Lease to be performed by Tenant, and Tenant shall not be entitled to interest thereon (or on any
amount paid to Landlord in advance for Demand Services). If Tenant fails to perform any of the covenants of this Lease to be performed by Tenant, then Landlord shall have the right, but no obligation, to apply the Security Deposit, or so much
thereof as may be necessary, to cure any such failure by Tenant. If Landlord applies the Security Deposit or any part thereof to cure any such failure by Tenant, then Tenant shall immediately pay to Landlord the sum necessary to restore the Security
Deposit to the full amount 

  

					
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required by this section 3.3. Landlord shall return any remaining portion of the Security Deposit to Tenant within thirty (30) days after termination of this Lease. Upon termination of the
original Landlord’s or any successor owner’s interest in the Premises, the original Landlord or such successor owner shall be released from further liability with respect to the Security Deposit upon the original Landlord’s or such
successor owner’s transferring the Security Deposit to the new owner. 
 3.4 Late Payment. Tenant acknowledges that the late
payment by Tenant of any monthly installment of Base Rent or additional rent will cause Landlord to incur costs and expenses, the exact amount of which is extremely difficult and impractical to fix. Such costs and expenses will include
administration and collection costs and processing and accounting expenses. Therefore, if any monthly installment of Base Rent or additional rent is not received by Landlord within ten (10) days after such installment is due, Tenant shall
immediately pay to Landlord a late charge equal to five percent (5%) of such delinquent installment. Landlord and Tenant agree that such late charge represents a reasonable estimate of such costs and expenses and is fair reimbursement to
Landlord. In no event shall such late charge be deemed to grant to Tenant a grace period or extension of time within which to pay any rent or prevent Landlord from exercising any right or enforcing any remedy available to Landlord upon Tenant’s
failure to pay each installment of rent due under this Lease when due, including the right to terminate this Lease and recover all damages from Tenant. All amounts that become payable by Tenant to Landlord under this Lease shall bear interest from
the date due until paid. The interest rate per annum shall be the interest rate established pursuant to 31 U.S.C. §3717 and 14 C.F.R. §1261.412 (or any successor rate schedule set under Applicable Laws) which are applicable to the period
in which the amount becomes due. Amounts shall be due upon the earliest one of (i) the date fixed pursuant to this Lease, or (ii) the date of the first written demand for payment, consistent with this Lease, including demand upon default.

 3.5 Taxes Payable by Tenant. Tenant shall pay, to the applicable taxing authority upon written demand and prior to delinquency,
all taxes, assessments, excises, levies, fees and charges, including all payments related to the cost of providing facilities or services, of every kind and description, general or special, ordinary or extraordinary, foreseen or unforeseen, secured
or unsecured, whether or not now customary or within the contemplation of Landlord and Tenant, that are levied, assessed, charged, confirmed or imposed by any public or government authority upon or against, or measured by, or reasonably attributable
to, or otherwise with respect to (a) the Premises or any part thereof or any personal property used in connection with the Premises, (b) the cost or value of Tenant’s furniture, fixtures, equipment and other personal property located
in the Premises or the cost or value of any improvements made in or to the Premises by or for Tenant, regardless of whether title to such improvements is vested in Tenant or Landlord, (c) any rent payable under this Lease, including any gross
income tax or excise tax levied by any public or government authority with respect to the receipt of any such rent, (d) the possession, leasing, operation, management, maintenance, alteration, repair, use or occupancy by Tenant of the Premises,
or (e) this transaction or any document to which Tenant is a party creating or transferring an interest or an estate in the Premises. All taxes, assessments, excises, levies, fees and charges payable by Tenant under this section 3.5 shall be
deemed to be, and shall be paid as, additional rent. 

  

					
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 3.6 Certain Definitions. As used in this Lease, certain words are defined as follows: 

(a) “Demand Services” shall mean all Utilities (as defined in section 3.6(b)) consumed by Tenant that Landlord will provide as set
forth in section 5.1, and any other materials or services furnished by Landlord at the request of Tenant on or about the Premises. Demand services shall exclude any telecommunication and date communication services and janitorial services, which
will be separately contracted for by Tenant pursuant to this Lease. 
 (b) “Utilities” shall mean all natural gas, electricity and
other power services, water service, sewer service, and any other utilities, furnished by Landlord directly or indirectly to, for the benefit of, or used by Tenant on or about the Premises. 

3.7 Rent Payment Address. Tenant shall pay all monthly Base Rent and costs of Demand Services (if any) under section 3.1 to “NASA
Ames Research Center,” in advance, on or before the first day of each and every calendar month during the Term. Each payment shall reference the number of this Lease. Tenant shall pay all rent to Landlord without notice, demand, deduction or
offset, in lawful money of the United States of America, at the address for the payment of rent specified in the Basic Lease Information, or to such other person or at such other place as Landlord may from time to time designate in writing.

 ARTICLE 4 
 Use of
the Premises 
 4.1 Permitted Use. Tenant shall use the Premises only for the Permitted Use of the Premises specified in the
Basic Lease Information and for lawful purposes incidental thereto, and no other purpose whatsoever. Tenant shall not do or permit to be done in. on or about the Premises, nor bring or keep or permit to be brought or kept therein, anything
which is prohibited by or will in any way conflict with any Applicable Laws, or which is prohibited by any insurance policy applicable to the Premises, or will in any way increase the existing rate of, or disallow any fire rating or sprinkler
credit, or cause a cancellation of, or affect any insurance for the Premises. Tenant shall not do or permit anything to be done in or about the Premises which will in any way obstruct or interfere with the rights of Landlord or other tenants or
users of the Property, or injure or annoy them. Tenant shall not use or allow the Premises to be used for any improper, immoral unlawful or objectionable activity, nor shall Tenant cause, maintain or permit any nuisance in, on or about the Premises
or commit or suffer to be committed any waste in, on or about the Premises. Except for equipment and fixtures that Tenant has constructed on the Building 543 Premises pursuant to permits previously issued by Landlord, Tenant shall not store any
materials equipment or vehicles outside the Premises and agrees that no washing of any type (including washing vehicles) shall take place in or outside the Premises. Tenant shall not receive, store or otherwise handle any product or material that is
explosive or highly inflammable, except in accordance with Applicable Laws. Tenant shall not install any signs on the Premises without the prior written consent of Landlord. Tenant shall, at Tenant’s expense, remove all such signs prior to or
upon termination of this Lease, repair any damage caused by the installation or removal of such signs, and restore the Premises to the condition that existed before installation of such signs. 

  

					
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 4.2 Environmental Definitions. As used in this Lease, “Hazardous Material” shall
mean any substance that is (a) defined under any Environmental Law (as defined below) as a hazardous substance, hazardous waste, hazardous material, pollutant or contaminant, (b) a petroleum hydrocarbon, including crude oil or any fraction
or mixture thereof, (c) hazardous, toxic, corrosive, flammable, explosive, infectious, radioactive, carcinogenic or a reproductive toxicant, or (d) otherwise regulated pursuant to any Environmental Law. As used in this Lease,
“Environmental Law” shall mean all Federal, state and local laws, statutes, ordinances, regulations, rules, judicial and administrative orders and decrees, permits, licenses, approvals, authorizations and similar requirements of all
Federal, state and local governmental agencies (including Landlord) or other governmental authorities pertaining to the protection of human health and safety or the environment, now existing or later adopted during the Term. As used in this Lease,
“Permitted Activities” shall mean the lawful activities of Tenant that are part of the ordinary course of Tenant’s business in accordance with the Permitted Use specified in the Basic Lease Information. As used in this Lease,
“Permitted Materials” shall mean the materials handled by Tenant in the ordinary course of conducting Permitted Activities. 
 4.3
Environmental Requirements. Tenant understands that the Property is underlain by a plume of contaminated groundwater that comprises two Superfund sites: the former Naval Air Station Moffett Field; and the Middlefield-Ellis-Whisman site.
Tenant understands that the groundwater is contaminated with solvents and petroleum hydrocarbons. Tenant hereby acknowledges receipt of the environmental reports listed on attached Exhibit D. Tenant hereby agrees that: (a) Tenant shall
not conduct, or permit to be conducted, on the Premises any activity which is not a Permitted Activity; (b) Tenant shall not use, store or otherwise handle, or permit any use, storage or other handling of, any Hazardous Material which is not a
Permitted Material on or about the Premises; (c) Tenant shall obtain and maintain in effect all permits and licenses required pursuant to any Environmental Law for Tenant’s activities on the Premises, and Tenant shall at all times comply
with all applicable Environmental Law; (d) Tenant shall not engage in the storage, treatment or disposal on or about the Premises of any Hazardous Material except for any temporary accumulation of waste generated in the course of Permitted
Activities; (e) Tenant shall not install any aboveground or underground storage tank or any subsurface lines for the storage or transfer of any Hazardous Material, except in accordance with Environmental Law, and Tenant shall store all
Hazardous Materials in a manner that protects the Premises, the Buildings, the Property and the environment from accidental spills and releases; (f) Tenant shall not cause any (and shall not allow any third party other than Landlord on the
Premises during the Term to) release of any Hazardous Material or any condition of pollution or nuisance on or about the Premises, whether affecting surface water or groundwater, air, the land or the subsurface environment; (g) Tenant shall
promptly remove from the Premises any Hazardous Material introduced, or permitted to be introduced, onto the Premises by Tenant which is not a Permitted Material and, on or before the date Tenant ceases to occupy the Premises, Tenant shall remove
from the Premises all Hazardous Materials and all Permitted Materials handled by or permitted on the Premises by Tenant; and (h) if any release of a Hazardous Material to the environment, or any condition of pollution or nuisance, occurs on or
about or beneath the Premises or either Building as a result of any act of Tenant or its agents, employees, contractors, invitees or licensees, Tenant, at Tenant’s sole cost and expense, shall promptly undertake all remedial measures required
to clean up and abate or otherwise respond to the release, pollution or nuisance in accordance with all applicable Environmental Law. Landlord and Landlord’s representatives shall have the right, but not the obligation, to enter the Premises at
any reasonable time for the purpose of inspecting the storage, use and handling of any Hazardous 

  

					
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Material on the Premises in order to determine Tenant’s compliance with the requirements of this Lease and applicable Environmental Law. If Landlord gives written notice to Tenant that
Tenant’s use, storage or handling of any Hazardous Material on the Premises may not comply with this Lease or applicable Environmental Law. Tenant shall correct any such violation within five (5) days after Tenant’s receipt of such
notice from Landlord to the extent required by Environmental Laws. Tenant shall indemnify and defend Landlord against and hold Landlord harmless from all claims, demands, actions, judgments, liabilities, costs, expenses, losses, damages, penalties,
fines and obligations of any nature (including reasonable attorneys’ fees and disbursements incurred in the investigation, defense or settlement of claims) that Landlord may incur as a result of, or in connection with, claims arising from the
presence, use, storage, transportation, treatment, disposal, release or other handling, on or about or beneath the Premises, of any Hazardous Material existing on or about or beneath the Premises caused by Tenant or its agents, employees,
contractors, invitees or licensees (collectively “Tenant Contamination”). Landlord hereby agrees to release Tenant from, and shall not charge Tenant for, any liabilities, costs, expenses, losses, damages, penalties, fines or obligations of
any nature as a result of, or in connection with any Hazardous Materials existing at the Property that are not Tenant Contamination, except to the extent that Tenant or its employees, agents, contractors or invitees exacerbates or causes a release
of any such existing Hazardous Materials. Tenant’s activities that comply with the permitted use of the Premises set forth in the Basic Lease Information will be included in NASA’s sitewide permits and plans, as applicable, such as
the Spill Prevention Control and Countermeasures Plan, the Storm Water Pollution Prevention Plan, the Biennial Hazardous Waste Report, the above ground storage tank statement, the Sunnyvale Industrial Waste Water permit, the Environmental Resources
Document, and the Integrated Natural Resources Management Plan. Coverage in these and other sitewide plans is included in the cost of ISP Services (as defined in section 6.1). Tenant shall promptly supply information to the NASA Environmental Office
(Code JQ) that is needed to complete these documents, and comply with the conditions of these permits. Tenant, at its sole cost, is responsible for obtaining hazardous materials storage permits and air permits required by Environmental Law for
Tenant’s use of the Premises. The liability of Tenant under this section 4.3 shall survive the termination of this Lease with respect to acts or omissions that occur before such termination. Landlord acknowledges that Tenant has provided the
necessary documents required under this Lease as of the Commencement Date with respect to Tenant’s existing use of Hazardous Materials at the Premises. 

4.4 Compliance With Law. Tenant shall, at Tenant’s sole cost and expense, promptly comply with all Federal, state and local laws,
ordinances, rules, regulations, codes (including the California Building Code), orders and other requirements of any government or public authority (including Landlord) now in force or which may hereafter be in force, with all requirements of any
board of fire underwriters such as the National Fire Protection Association (“NFPA”) or other similar body now or hereafter constituted, and with all directions and certificates of occupancy issued pursuant to any law by any governmental
agency (including Landlord) or officer, insofar as any thereof relate to Tenant’s use of the Premises or the operation, use or maintenance of any personal property, fixtures, machinery, equipment or improvements on the Premises (collectively,
“Applicable Laws”). Without limiting the foregoing, Tenant shall comply with all policy directives, procedural requirements, procedures and guidelines, and standards promulgated by Landlord or NASA Ames Research Center from time to time

  

					
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(collectively, “Landlord Policies”), including with respect to construction activities, facility use, land use, health, safety, security and environmental standards (including
Environmental Law). Landlord agrees that no change in Landlord Policies shall be retroactively applied to the Premises with the result that Tenant must incur any capital expense, unless (i) Tenant modifies the Premises, changes its use or takes
such other act as would require compliance with Landlord Policies, or (ii) a corresponding change in Applicable Laws other than Landlord Policies requires retroactive application to the Premises. Notwithstanding the foregoing, Tenant shall not
be obligated to comply with Ames Procedural Requirements 1700.1, except with respect to explosive materials; radioactive materials (as defined by the Nuclear Regulatory Commission); Class IIIa, IIIb or IV lasers or microwave or radio frequency
transmitters; cryogens; pressure systems; or human pathogens that require Center for Disease Control Biosafety level III or IV containment. Tenant shall deliver prior written notice to Landlord before Tenant manufactures, uses, stores or transports
any such items on or about the Premises or the Property, and Landlord shall have the right to approve (and establish requirements for, or conditions of, approval) before Tenant manufactures, uses, stores or transports any such items. This Lease does
not grant Tenant any rights to use the NASA or NASA Ames Research Center name, initials or logo. Tenant agrees to submit to Landlord for its approval all promotional and advertising material that uses the NASA or NASA Ames Research Center name,
initials or logo prior to publication. Approval by Landlord shall be based on Applicable Laws (e.g. 51 U.S.C. §§ 20141, 20111(a) and 20113(a); and 14 C.F.R. § 1221.100 et seq.) and policy governing the use of the words “National
Aeronautics and Space Administration” and the letters “NASA.” Tenant shall not be required to make structural changes to the Premises or the Buildings unless structural changes are related to or required by Tenant’s acts or use
of the Premises or by improvements made by or for Tenant. Occupancy of the Premises is permitted under Landlord’s 2002 Environmental Impact Statement. To comply with the TDM Plan (as defined below), Tenant will cooperate with Landlord and
hereby authorizes Landlord to complete a transportation survey of Tenant’s employees as may be requested by Landlord from time to time. As used in this Lease, the phrase “TDM Plan” shall mean that certain draft report entitled
“NASA Research Park and Bay View Transportation Demand Management Plan,” dated July 2002 (prepared by Nelson/Nygaard Consulting Associates), which is a portion of Appendix B to the NASA Ames Development Plan Final Programmatic
Environmental Impact Statement. 
 4.5 Rules and Regulations. The use and occupancy of the Premises shall be subject to such
reasonable and non-discriminatory rules and regulations as may be prescribed from time to time by NASA policy covering various matters, including operations, security, access, communications or other aspects of the mission of the Property. Landlord
agrees that no change in such rules and regulations shall be retroactively applied to the Premises with the result that Tenant must incur any capital expense, unless (i) Tenant modifies the Premises, changes its use or takes such other act as
would require compliance with such rules and regulations, or (ii) a corresponding change in Applicable Laws other than such rules and regulations requires retroactive application to the Premises. 

4.6 Entry by Landlord. Landlord shall have the right to enter the Premises at any time to (a) inspect the Premises,
(b) exhibit the Premises to prospective purchasers, tenants or users, (c) determine whether Tenant is performing all of Tenant’s obligations, (d) supply any service to be provided by Landlord, (e) post notices of
nonresponsibility, and (f) make any repairs to the Premises, or make any repairs to any adjoining space or Utilities, or make any repairs, alterations 

  

					
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or improvements to any other portion of the Property, provided that all such work shall be done as promptly as reasonably practicable and so as to cause as little interference to Tenant as
reasonably practicable. Landlord also specifically reserves the following rights: (i) to control ingress to and egress from the Property, to erect and maintain gates, and to regulate or prevent traffic; and (ii) on behalf of Landlord, the
United States Environmental Protection Agency, the State of California and other entities and governmental agencies that are involved in the remediation of, or that are responsible to remediate, existing contamination on or about the Property, the
right to have unobstructed access to known or suspected areas of contamination or other areas upon which any containment system, treatment system, monitoring system, or other environmental response action is installed or implemented, or to be
installed or implemented, for the purposes of the complying with Environmental Law and requirements. Tenant waives all claims for damages for any injury or Inconvenience to or interference with Tenant’s business, any loss of occupancy or quiet
enjoyment of the Premises or any other loss occasioned by such entry or Landlord’s exercise of such reserved rights. All locks for all doors in, on or about the Premises (excluding Tenant’s vaults, safes and similar special security areas
designated in writing by Tenant) shall be keyed to the master system for the Property. Landlord shall at all times have a key to unlock all such doors and Landlord shall have the right to use any and all means which Landlord may deem proper to open
such doors in an emergency to obtain entry to the Premises. Any entry to the Premises obtained by Landlord by any of such means shall not under any circumstances be construed or deemed to be a forcible or unlawful entry into or a detainer of the
Premises or an eviction, actual or constructive, of Tenant from the Premises or any portion thereof. 
 ARTICLE 5 

Utilities and Demand Services 

5.1 Landlord’s Responsibilities. Landlord shall furnish Utilities to the Premises in accordance with Landlord’s current
practices and standards for the Property, subject to temporary shut down for repairs, for security purposes, for compliance with any Applicable Laws or due to any event or occurrence beyond Landlord’s reasonable control. Tenant agrees that
Landlord’s practices and standards do not include Utilities in quantities exceeding those typically and reasonably necessary for average office building environments and uses, and Landlord makes no representations or warranties to Tenant
regarding the adequacy or fitness of any Utilities for Tenant’s use, occupancy or enjoyment of the Premises (including, without limitation, Tenant’s needs, If any for additional or unique heating, ventilation, air conditioning, electricity
or natural gas). The Parties acknowledge that the Buildings are separately metered for electricity service, natural gas service and water service (following Tenant’s installation of a water meter with respect to the Building 154 Premises).
Tenant shall pay Landlord as Demand Services for all Utilities consumed on the Premises as measured by such meters and as read by Landlord periodically (charges for sewer service shall be calculated as a percentage of water consumed). Landlord shall
not be in default under this Lease or be liable for any damage or loss directly or indirectly resulting from, nor shall the rent be abated or a constructive or other eviction be deemed to have occurred by reason of, any interruption of or failure to
supply or delay in supplying any Utilities or Demand Services or any limitation, curtailment, rationing or restriction on use of water, electricity, natural gas or any resource or form of energy or other service serving the Premises or the Property,
whether such results from mandatory restrictions or voluntary compliance with guidelines; provided, however, that in the event any such curtailment, 

  

					
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limitation, rationing or restriction materially interferes with Tenant’s ability to perform its operations in the Premises for thirty (30) continuous days or longer, Tenant shall have
the right to terminate this Lease by delivering written notice to Landlord on or before the date which is sixty (60) days after such curtailment, limitation, rationing or restriction commenced. 

5.2 Tenant’s Responsibilities. Tenant shall pay before delinquency for all Demand Services supplied to the Premises in accordance
with Article 3, together with all taxes, assessments, surcharges and similar expenses relating to such Demand Services (if any). Tenant shall make arrangements with an appropriate telephone service provider for any or all telephone services to be
provided directly to Tenant, and Tenant shall pay before delinquency the costs thereof to the entity providing the same. In addition, at Tenant’s option from time to time, but in each instance subject to Landlord’s prior written approval
(which approval shall not be unreasonably withheld), Tenant may make arrangements with appropriate service providers for any or all Demand Services to be provided directly to Tenant, in which event Tenant shall pay before delinquency the costs
thereof to the entity providing the same. 
 ARTICLE 6 

Maintenance and Repairs 

6.1 Obligations of Landlord. Landlord shall maintain and repair the common areas of the Property, and keep them in good condition,
reasonable wear and tear excepted. The parties agree that, for purposes of this Article 6, Landlord’s obligations extend to the following locations (the “Points of Connection”): (a) with respect to the electrical power (including
wiring, electrical components and apparatus, and auxiliary supporting systems and equipment such as HVAC equipment), natural gas service and water utility systems located on, in or under the common areas of the Property and which serve the
Buildings, to the applicable meter for each such utility system for each Building; and (b) with respect to the common areas of the Property and all utility systems other than electrical power, natural gas service and water, to the point which
is five (5) feet from the exterior walls of each Building. If requested by Tenant in writing, Landlord shall provide, as a Demand Service, janitorial services in accordance with Landlord’s current standards and practices (and Tenant
acknowledges that trash is collected only three (3) times per week). Landlord shall provide ISP Services with respect to the Property in accordance with Landlord’s current practices and standards for the Property, subject to temporary shut
down for repairs, for security purposes, for compliance with any Applicable Laws or due to any event or occurrence beyond Landlord’s reasonable control. Tenant shall give Landlord written notice of the need for any maintenance or repair for
which Landlord is responsible, after which Landlord shall have a reasonable opportunity to perform the maintenance or make the repair, and Landlord shall not be liable for any failure to do so unless such failure continues for an unreasonable time
after Tenant gives such written notice to Landlord. Tenant waives any right to perform maintenance or make repairs for which Landlord is responsible at Landlord’s expense. Landlord’s liability with respect to any maintenance or repair for
which Landlord is responsible shall be limited to the cost of the maintenance or repair. Any damage to any part of the Property for which Landlord is responsible that is caused by Tenant or any agent, employee, contractor, licensee or invitee of
Tenant shall be repaired by Landlord at Tenant’s expense and Tenant shall pay to Landlord, upon billing by Landlord, as additional rent, the cost of such repairs incurred by Landlord. As used in this Lease, the phrase “ISP Services”
shall mean: (i) common grounds and road maintenance; (ii) security; (iii) structural fire response and periodic Fire Marshal inspections; (iv) first responder operations (Hazardous Material); (v) utility infrastructure
systems maintenance and repair; and (vi) routine administrative support and management oversight (i.e. environmental oversight) related to this Lease. 

  

					
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 6.2 Obligations of Tenant. Tenant shall maintain and repair the Premises and the
Buildings, including the foundations, walls, windows, glass or plate glass, exterior doors, entries, the heating and air conditioning, mechanical, electrical, plumbing and life safety systems, the roof and other structural components of the
Buildings. The parties agree that, for purposes of this Article 6, Tenant’s obligations to maintain and repair the Premises (including the utility systems on, in and under the common areas of the Property that serve the Buildings) extend to and
include the Points of Connection. Tenant shall not damage the Premises or disturb the integrity and support provided by any wall. Tenant shall, at Tenant’s expense, promptly repair any damage to the Premises caused by Tenant or any agent,
employee, contractor, licensee or invitee of Tenant. Tenant shall take good care of the Premises and keep the Premises free from dirt, rubbish, waste and debris at all times. Tenant, at its cost, shall provide janitorial services for the Premises.
Tenant shall not overload the floors in the Buildings or exceed the load-bearing capacity of the floors in the Buildings. Tenant shall, at the end of the Term, surrender to Landlord the Premises and all alterations, additions, fixtures and
improvements therein or thereto in the same condition as existed on the Commencement Date, ordinary wear and tear excepted; provided, however, Tenant shall remove all improvements, alterations, additions, equipment and fixtures installed or placed
by Tenant on any portion of the Building 543 Premises other than Building 543. 
 ARTICLE 7 

Alteration of the Premises 

7.1 No Alterations by Tenant. Tenant shall not make any alterations, additions or improvements in or to the Premises or any part
thereof, or attach any fixtures or equipment thereto, without Landlord’s prior written consent, not to be unreasonably withheld or delayed. All alterations, additions and improvements in or to the Premises to which Landlord consents shall be
made by Tenant at Tenant’s sole cost and expense as follows: 
 (a) Tenant shall submit to Landlord, for Landlord’s written
approval, complete plans and specifications for all work to be done by Tenant. Such plans and specifications shall be prepared by responsible licensed architect(s) and engineer(s), shall comply with all Applicable Laws, shall not adversely affect
any systems, components or elements of the Buildings or the Property, shall be in a form sufficient to secure the approval of all government authorities with jurisdiction over the Property, and shall be otherwise satisfactory to Landlord in
Landlord’s reasonable discretion. 
 (b) Tenant shall obtain all required permits for the work from the Ames Construction Permit
Office, in accordance with Ames Policy Directive 8829.1. In addition, Tenant shall obtain hot-work permits from the NASA Safety, Health and Medical Services Division during normal business hours at least twenty – four (24) hours prior to
performing any welding, cutting, torching or similar open flame work. Tenant shall engage responsible contractor(s) licensed in the State of California to perform all work. Tenant and its contractors shall carry such liability and builder’s
risk insurance as Landlord may reasonably require with respect to the work, which 

  

					
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policies shall comply with the provisions of section 8.3. Landlord reserves the right to cause Tenant or its contractors to procure and maintain payment, performance and/or completion bonds with
respect to the work. Tenant shall perform all work in accordance with the plans and specifications approved by Landlord, in a good and workmanlike manner, in full compliance with all Applicable Laws, and free and clear of any mechanics’ liens.
Tenant shall pay for all work (including the cost of all Utilities, permits, fees, taxes, and property and liability insurance premiums in connection therewith) required to make the alterations, additions and improvements. Tenant shall pay to
Landlord all direct costs and shall reimburse Landlord for all expenses incurred by Landlord in connection with the review, approval and supervision of any alterations, additions or improvements made by Tenant. Under no circumstances shall Landlord
be liable to Tenant for any damage, loss, cost or expense incurred by Tenant on account of design of any work, construction of any work, or delay in completion of any work. 

(c) Tenant shall give written notice to Landlord of the date on which construction of any work will be commenced at least five (5) days
prior to such date. Tenant shall keep the Premises and the Property free from mechanics’, materialmen’s and all other liens arising out of any work performed, labor supplied, materials furnished or other obligations incurred by Tenant.
Tenant shall promptly and fully pay and discharge all claims on which any such lien could be based. Tenant shall have the right to contest the amount or validity of any such lien, provided Tenant gives prior written notice of such contest to
Landlord, prosecutes such contest by appropriate proceedings in good faith and with diligence, and, upon request by Landlord, furnishes such bond as may be required by law or such security as Landlord may require to protect the Premises and the
Property from such lien. Landlord shall have the right to post and keep posted on the Premises any notices that may be provided by law or which Landlord may deem to be proper for the protection of Landlord, the Premises and the Property from such
liens, and to take any other action Landlord deems necessary to remove or discharge liens or encumbrances at the expense of Tenant. 
 7.2
Tenant’s Property. All improvements, alterations, additions, equipment and fixtures, whether temporary or permanent in character, made in or to any portion of the Building 543 Premises other than Building 543 (including all such
improvements, alterations, additions, equipment and fixtures previously made by Tenant pursuant to the Existing Leases) shall be removed by Tenant upon the expiration or earlier termination of this Lease. Tenant shall return Building 543 its
condition as existed on the Commencement Date, reasonable wear and tear excepted, or to such other condition as is mutually agreed to by Landlord and Tenant. Tenant shall return the Building 154 Premises to its condition as existed upon completion
of the TI Work, reasonable wear and tear excepted, or to such other condition as is mutually agreed to by Landlord and Tenant. Should Tenant abandon any such alterations, additions, fixtures or improvements, they shall become the property of the
United States Government and shall be retained by Landlord. All movable furniture, equipment, trade fixtures, computers, office machines and other personal property shall remain the property of Tenant. Upon termination of this Lease, Tenant shall,
at Tenant’s expense, remove all such movable furniture, equipment, trade fixtures, computers, office machines and other personal property from the Property and repair all damage caused by any such removal. Termination of this Lease shall not
affect the obligations of Tenant pursuant to this section 7.2 to be performed after such termination. 

  

					
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 ARTICLE 8 

Indemnification and Insurance 

8.1 Damage or Injury. Landlord shall not be liable to Tenant, and Tenant hereby waives and releases all claims against Landlord, for
any damage to or loss or theft of any property or for any bodily or personal injury, illness or death of any person in, on or about the Premises or the Property arising at any time and from any cause whatsoever, unless the same is caused solely by
the willful misconduct of Landlord. Tenant shall indemnify and defend Landlord against and hold Landlord harmless from all claims, demands, liabilities, damages, losses, costs and expenses, including reasonable attorneys’ fees and
disbursements, arising from or related to any use or occupancy of the Premises, or any condition of the Premises, or any default in the performance of Tenant’s obligations under this Lease, or any damage to any property (including property of
employees and invitees of Tenant) or any bodily or personal injury, illness or death of any person (including employees and invitees of Tenant) occurring in, on or about the Premises or any part thereof arising at any time and from any cause
whatsoever (unless the same is caused solely by the willful misconduct of Landlord) or occurring in, on or about any part of the Property other than the Premises when such damage, bodily or personal injury, illness or death is caused by any act or
omission of Tenant or its agents, employees, contractors, invitees or licensees. This section 8.1 shall survive the termination of this Lease with respect to any damage, bodily or personal injury, illness or death occurring prior to such
termination. 
 8.2 Insurance Coverages and Amounts. Tenant shall, at all times during the Term and at Tenant’s sole cost and
expense, obtain and keep in force the insurance coverages and amounts set forth in this section 8.2. 
 (a) Tenant shall maintain commercial
general liability insurance, including contractual liability, broad form property damage liability, premises and completed operations, with limits not less than one million dollars ($1,000,000) per occurrence and three million dollars ($3,000,000)
annual aggregate, and for fire legal liability with a limit not less than one hundred thousand dollars ($100,000) and for medical payments with a limit not less than five thousand dollars ($5,000), insuring against claims for bodily injury, personal
injury and property damage arising from the use, occupancy or maintenance of the Premises and the Property. The policy shall contain an exception to any pollution exclusion which insures damage or injury arising out of heat, smoke or fumes from a
hostile fire. Any general aggregate shall apply on a per location basis. 
 (b) If Tenant uses owned, hired and non-owned vehicles, Tenant
shall maintain business auto liability insurance with limits not less than one million dollars ($1,000,000) per accident covering such vehicles. 

(c) Tenant shall carry workers’ compensation insurance for all of its employees in statutory limits as required by California law and
employers liability insurance which affords not less than five hundred thousand dollars ($500,000) for each coverage. 

  

					
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 (d) Tenant shall maintain property insurance for the perils covered by a standard fire insurance
policy, extended coverage perils and vandalism and malicious mischief and, if applicable, boiler machinery and pressure vessel insurance. The amount of such insurance shall be the Full Insurable Replacement Value (as defined below). All such
policies shall specify that proceeds shall be payable on a Full Insurable Replacement Value basis if the improvements are actually repaired or rebuilt and on an “actual cash value” basis if the improvements are neither repaired nor
replaced, and shall include a “guaranteed amount” or “stipulated amount” endorsement of coverage in lieu of a coinsurance provision under the policy. As used in this Lease, the phrase “Full Insurable Replacement Value”
means one hundred percent (100%) of actual costs to perform repairs, maintenance, replacement or alterations of the Premises or any part thereof (without deduction for depreciation but with standard exclusions such as foundations, excavations,
paving and landscaping, as applicable to specific perils), including Tenant’s movable furniture, equipment, trade fixtures or personal property in the Premises, and including the costs of demolition and debris removal and an increased cost of
construction endorsement. The Full Insurable Replacement Value of Building 543 initially shall be one million four hundred fifty – three thousand dollars ($1,453,000). The Full Insurable Replacement Value of Building 154 initially shall be four
million seven hundred forty – two thousand dollars ($4,742,000). Tenant shall, throughout the Term, maintain coverage at the current Full Insurable Replacement Value (with a commercially reasonable deductible) determined as provided herein.

 (e) Tenant shall, at Tenant’s sole expense, obtain and keep in force during the Term an “all risk” insurance policy for
Tenant’s personal property, furniture, fixtures and equipment, inventory, alterations, trade fixtures, and plate glass located on the Premises, in an amount not less than one hundred percent (100%) of their actual replacement value,
providing coverage for risk of direct physical loss or damage including vandalism and malicious mischief. The proceeds of such insurance, so long as this Lease remains in effect, shall be used to repair or replace the personal property, furniture,
fixtures and equipment, inventory, alterations, trade fixtures, and plate glass so insured. Provided such proceeds are applied as set forth in this section 8.2(e), any insurance proceeds received by Tenant under such policy shall be the sole
property of Tenant, and Landlord shall have no rights thereto. 
 (f) Any deductibles selected by Tenant for any insurance policy described
in this section 8.2 shall be the sole responsibility of Tenant. 
 8.3 Insurance Requirements. 

(a) All insurance and all renewals thereof shall be issued by companies with a rating of at least “A-” “VIII” (or its
equivalent successor) or better in the current edition of Best’s Insurance Reports (or its equivalent successor, or, if there is no equivalent successor rating, otherwise acceptable to Landlord) and be licensed to do and doing business in
California. 
 (b) Each policy shall be endorsed to provide that the policy shall not be canceled or materially altered without thirty
(30) days prior written notice to Landlord and shall remain in effect notwithstanding any such cancellation or alteration until such notice shall have been given to Landlord and such period of thirty (30) days shall have expired. 

  

					
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 (c) The commercial general liability and any automobile liability insurance shall be endorsed to
name Landlord (and any other parties designated by Landlord) as an additional insured, shall be primary and noncontributing with any insurance which may be carried by Landlord, and shall afford coverage for all claims based on any act, omission,
event or condition that occurred or arose (or the onset of which occurred or arose) during the policy period. 
 (d) Tenant shall deliver
certificates of insurance and endorsements, acceptable to Landlord, together with copies of the insurance policies, to Landlord at least ten (10) days before the Commencement Date and at least ten (10) days before expiration of each
policy. Such documents shall be delivered to the address for certificate holder set forth below. If Tenant fails to insure or fails to furnish any such insurance certificate, endorsement or policy. Landlord shall have the right from time to time to
effect such insurance for the benefit of Tenant or Landlord or both of them, and Tenant shall pay to Landlord on written demand, as additional rent, all premiums paid by Landlord. Each certificate of insurance shall list the certificate holder as
follows: 
 NASA Ames Research Center 

Office of the Chief Counsel, Mail Stop 200-12 

Bldg. 200, Rm 234 
 P.O. Box 1

 Moffett Field, CA 94035-0001 

(e) If Landlord at any time believes that the limits or extent of coverage or deductibles with respect to any of the insurance required in
this Lease are insufficient, Landlord may determine the proper and reasonable limits and extent of coverage and deductibles for such insurance and such insurance shall thereafter be carried with the limits and extent of coverage and deductibles as
so determined until further change pursuant to the provisions of this Lease. 
 (f) No approval by Landlord of any insurer, or the terms or
conditions of any policy, or any coverage or amount of insurance, or any deductible amount shall be construed as a representation by Landlord of the solvency of the insurer or the sufficiency of any policy or any coverage or amount of insurance or
deductible. By requiring insurance herein, Landlord makes no representation or warranty that coverage or limits will necessarily be adequate to protect Tenant, and such coverage and limits shall not be deemed as a limitation on Tenant’s
liability under the indemnities granted to NASA in this Lease. 
 (g) Failure of NASA to demand such certificate or other evidence of full
compliance with these insurance requirements or failure of NASA to identify a deficiency from evidence that is provided shall not be construed as a waiver of Tenant’s obligation to maintain such insurance. 

8.4 Subrogation. Tenant waives on behalf of all insurers under all policies of insurance now or hereafter carried by Tenant insuring or
covering the Premises, or any portion or any contents thereof, or any operations therein, all rights of subrogation which any such insurer might otherwise, if at all, have to any claims of Tenant against Landlord except for workers’
compensation. Tenant shall procure from each of the insurers under all such policies of insurance a waiver of all rights of subrogation which the insurer might otherwise, if at all, have to any claims of Tenant against Landlord as required by this
section 8.4 stating the following: “The insurer waives any right of subrogation against the United States of America which might arise by reason of any payment made under this policy.” 

  

					
	BE 543 154 EUL Final 120511	  		  	SAA2 – 402658
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 ARTICLE 9 

Assignment or Sublease 

9.1 Prohibition. Tenant shall not, directly or indirectly, without the prior written consent of Landlord (which consent may be given or
withheld in Landlord’s sole and absolute discretion), assign this Lease or any interest herein or sublease the Premises or any part thereof, or permit the use or occupancy of the Premises by any person or entity other than Tenant, Tenant shall
not, directly or indirectly, without the prior written consent of Landlord (which consent may be given or withheld in Landlord’s sole and absolute discretion), pledge, mortgage or hypothecate this Lease or any interest herein. This Lease shall
not, nor shall any interest herein, be assignable as to the interest of Tenant involuntarily or by operation of law without the prior written consent of Landlord (which consent may be given or withheld in Landlord’s sole and absolute
discretion), provided that if Landlord’s consent is unreasonably withheld, Tenant shall have the right to terminate this Lease by delivering written notice to Landlord within ten (10) days after the date Landlord withholds its consent.
Landlord’s consent to any proposed assignment or subletting shall not be unreasonably delayed and if not given or withheld within thirty (30) days following Tenant’s request for consent, shall be deemed withheld. Any of the foregoing
acts without such prior written consent of Landlord shall be void and shall, at the option of Landlord, constitute a default that entitles Landlord to terminate this Lease. Tenant agrees that the instrument by which any assignment or sublease to
which Landlord consents is accomplished shall expressly provide that the assignee or subtenant will perform all of the covenants to be performed by Tenant under this Lease (in the case of a sublease, only insofar as such covenants relate to the
portion of the Premises subject to such sublease) as and when performance is due after the effective date of the assignment or sublease and that Landlord will have the right to enforce such covenants directly against such assignee or subtenant. Any
purported assignment or sublease without an instrument containing the foregoing provisions shall be void. Tenant shall in all cases remain liable for the performance by any assignee or subtenant of all such covenants. Notwithstanding the foregoing,
Tenant may, subject to Landlord’s limited consent rights set forth below and without any participation by Landlord in assignment and subletting proceeds, sublet the Premises or assign the Lease to any of the following entities (each, a
“Permitted Transferee”): (i) a subsidiary, affiliate, division or corporation controlling, controlled by or under common control with Tenant; (ii) a successor corporation related to Tenant by merger, consolidation, nonbankruptcy
reorganization, or government action; or (iii) a purchaser of substantially all of Tenant’s assets located in the Premises. If Tenant desires to sublet the Premises or assign the Lease to a Permitted Transferee, Tenant shall deliver
written notice to Landlord and describe in reasonable detail the proposed use of the Premises by the Permitted Transferee and discuss whether or not the Permitted Transferee will continue (or expand) the collaborative and programmatic relationships
between Landlord and Tenant in support of Landlord’s missions. Landlord agrees not to unreasonably withhold its consent to a sublease or assignment to a Permitted Transferee; provided, however, Tenant agrees that it shall be reasonable for
Landlord to withhold consent if Landlord reasonably determines that the Permitted Transferee will not continue and maintain such collaborative and programmatic relationships. Landlord’s consent to a sublease or assignment to a Permitted
Transferee shall be deemed given unless Landlord delivers to Tenant written notice withholding its consent within thirty (30) days after receiving Tenant’s written request. For the purpose of this Lease, sale of Tenant’s capital stock
through any public exchange shall not be deemed an assignment, subletting, or any other transfer of the Lease or the Premises. 

  

					
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 9.2 Landlord’s Consent or Termination. If Tenant wishes to assign this Lease or
sublease all or any part of the Premises, Tenant shall give written notice to Landlord identifying the intended assignee or subtenant by name and address and specifying all of the terms of the intended assignment or sublease. Tenant shall give
Landlord such additional information concerning the intended assignee or subtenant (including complete financial statements and a business history) or the intended assignment or sublease (Including true copies thereof) as Landlord requests. For a
period of thirty (30) days after such written notice is given by Tenant, Landlord shall have the right, by giving written notice to Tenant, (a) to consent in writing to the intended assignment or sublease, unless Landlord determines not to
consent, or (b) in the case of an assignment of this Lease or a sublease of substantially the entire Premises for substantially the balance of the Term, to terminate this Lease, which termination shall be effective as of the date on which the
intended assignment or sublease would have been effective if Landlord had not exercised such termination right. 
 9.3 Completion. If
Landlord consents in writing, Tenant may complete the intended assignment or sublease subject to the following covenants: (a) the assignment or sublease shall be on the same terms as set forth in the written notice given by Tenant to Landlord,
(b) no assignment or sublease shall be valid and no assignee or subtenant shall take possession of the Premises or any part thereof until an executed duplicate original of such assignment or sublease has been delivered to Landlord, (c) no
assignee or subtenant shall have a right further to assign or sublease, and (d) all “excess rent” (as defined below) derived from such assignment or sublease shall be paid to Landlord. Such excess rent shall be deemed to be, and shall
be paid by Tenant to Landlord as, additional rent. Tenant shall pay such excess rent to Landlord immediately as and when such excess rent becomes due and payable to Tenant. As used in this section 9.3, “excess rent” shall mean the amount
by which the total money and other economic consideration to be paid by the assignee or subtenant as a result of an assignment or sublease, whether denominated rent or in lieu of rent, exceeds, in the aggregate, the total amount of rent which Tenant
is obligated to pay to Landlord under this Lease (prorated to reflect the rent allocable to the portion of the Premises subject to such assignment or sublease), less only the reasonable costs paid by Tenant for reasonable leasing commissions,
reasonable attorneys’ fees and additional improvements installed in the portion of the Premises subject to such assignment or sublease by Tenant at Tenant’s sole cost and expense for the specific assignee or subtenant in question, without
deduction for carrying costs due to vacancy or otherwise. The costs of additional improvements shall be amortized without interest over the term of such assignment or sublease. 

9.4 Tenant Not Released. No assignment or sublease whatsoever shall release Tenant from Tenant’s obligations and liabilities under
this Lease or alter the primary liability of Tenant to pay all rent and to perform all obligations to be paid and performed by Tenant. No assignment or sublease shall amend or modify this Lease in any respect, and every assignment and sublease shall
be subject and subordinate to this Lease. The acceptance of rent by Landlord from any other person or entity shall not be deemed to be a waiver by Landlord of any provision of this Lease. Consent to one assignment or sublease shall not be deemed
consent to any subsequent assignment or sublease. Tenant shall pay to Landlord all direct costs and shall reimburse Landlord for all expenses incurred by Landlord in connection with any assignment or sublease 

  

					
	BE 543 154 EUL Final 120511	  		  	SAA2 – 402658
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 requested by Tenant not to exceed two thousand dollars ($2,000) per event of assignment or subletting. If any
assignee, subtenant or successor of Tenant defaults in the performance of any obligation to be performed by Tenant under this Lease. Landlord may proceed directly against Tenant without the necessity of exhausting remedies against such assignee,
subtenant or successor. Landlord may consent to subsequent assignments or subleases or amendments or modifications to this Lease with assignees, subtenants or successors of Tenant, without notifying Tenant or any successor of Tenant and without
obtaining any consent thereto from Tenant or any successor of Tenant, and such action shall not release Tenant from liability under this Lease. 

ARTICLE 10 
 Events of
Default and Remedies 
 10.1 Default by Tenant. The occurrence of any one or more of the following events (“Event of
Default”) shall constitute a breach of this Lease by Tenant: 
 (a) Tenant fails to pay any Base Rent, or any additional rent under
section 3.1, or other amount of money or charge payable by Tenant and such failure continues for more than ten (10) days after the date such rent becomes due and payable; or 

(b) Tenant fails to perform or breaches any other agreement or covenant of this Lease to be performed or observed by Tenant as and when
performance or observance is due and such failure or breach continues for more than ten (10) days after Landlord gives written notice thereof to Tenant; provided, however, that if, by the nature of such agreement or covenant, such failure or
breach cannot reasonably be cured within such period of ten (10) days, an Event of Default shall not exist as long as Tenant commences with due diligence and dispatch the curing of such failure or breach within such period of ten (10) days
and, having so commenced, thereafter prosecutes with diligence and dispatch and completes the curing of such failure or breach; or 
 (c)
Tenant (i) files, or consents by answer or otherwise to the filing against it of, a petition for relief or reorganization or arrangement or any other petition in bankruptcy or for liquidation or to take advantage of any bankruptcy, insolvency
or other debtors’ relief law of any jurisdiction, (ii) makes an assignment for the benefit of its creditors, or (iii) consents to the appointment of a custodian, receiver, trustee or other officer with similar powers of Tenant or of
any substantial part of Tenant’s property; or 
 (d) Without consent by Tenant, a court or government authority enters an order, and
such order is not vacated within thirty (30) days, (i) appointing a custodian, receiver, trustee or other officer with similar powers with respect to Tenant or with respect to any substantial part of Tenant’s property, or
(ii) constituting an order for relief or approving a petition for relief or reorganization or arrangement or any other petition in bankruptcy or for liquidation or to take advantage of any bankruptcy, insolvency or other debtors’ relief
law of any jurisdiction, or (iii) ordering the dissolution, winding-up or liquidation of Tenant; or 
 (e) This Lease or any estate of
Tenant hereunder is levied upon under any attachment or execution and such attachment or execution is not vacated within thirty (30) days; or 

  

					
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 (f) Tenant abandons the Premises. 

10.2 Termination. If an Event of Default occurs, Landlord shall have the right at any time to give a written termination notice to
Tenant and, on the date specified in such notice, Tenant’s right to possession shall terminate and this Lease shall terminate. Upon such termination, Landlord shall have the full and immediate right to possession of the Premises and Landlord
shall have the right to recover from Tenant all unpaid rent which had been earned at the time of termination, all unpaid rent for the balance of the Term after termination, and all other amounts necessary to compensate Landlord for all the detriment
proximately caused by Tenant’s failure to perform all of Tenant’s obligations under this Lease or which in the ordinary course of things would be likely to result therefrom. 

10.3 Continuation. If an Event of default occurs, this Lease shall continue in effect for so long as Landlord does not terminate
Tenant’s right to possession, and Landlord shall have the right to enforce all its rights and remedies under this Lease, including the right to recover all rent as it becomes due under this Lease. Acts of maintenance or preservation or efforts
to relet the Premises or the appointment of a receiver upon initiative of Landlord to protect Landlord’s interest under this Lease shall not constitute a termination of Tenant’s right to possession unless written notice of termination is
given by Landlord to Tenant. 
 10.4 Remedies Cumulative. Upon the occurrence of an Event of Default, Landlord shall have the right
to exercise and enforce all rights and remedies granted or permitted by law. The remedies provided for in this Lease are cumulative and in addition to all other remedies available to Landlord at law or in equity by statute or otherwise. Exercise by
Landlord of any remedy shall not be deemed to be an acceptance of surrender of the Premises by Tenant, either by agreement or by operation of law. Surrender of the Premises can be effected only by the written agreement of Landlord and Tenant. 

10.5 Tenant’s Primary Duty. All agreements and covenants to be performed or observed by Tenant under this Lease shall be at
Tenant’s sole cost and expense and without any abatement of rent. If Tenant fails to pay any sum of money to be paid by Tenant or to perform any other act to be performed by Tenant under this Lease, Landlord shall have the right, but shall not
be obligated, and without waiving or releasing Tenant from any obligations of Tenant, to make any such payment or to perform any such other act on behalf of Tenant in accordance with this Lease. All sums so paid by Landlord and all costs incurred or
paid by Landlord shall be deemed additional rent hereunder and Tenant shall pay the same to Landlord on written demand, together with interest on all such sums and costs from the date of expenditure by Landlord to the date of repayment by Tenant at
the rate of ten percent (10%) per annum. 
 10.6 Abandoned Property. If Tenant abandons the Premises, or is dispossessed by
process of law or otherwise, all alterations, additions, fixtures and improvements made by Tenant and left in the Premises, and all movable furniture, equipment, trade fixtures or personal property belonging to Tenant and left in the Premises, shall
be deemed to be abandoned. Landlord may retain the same, or at the option of Landlord, sell or otherwise dispose of the same in any commercially reasonable manner. 

  

					
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 10.7 Landlord Default. If Landlord defaults under this Lease, Tenant shall give written
notice to Landlord specifying such default with particularity, and Landlord shall have thirty (30) days after receipt of such notice within which to cure such default. In the event of any default by Landlord, Tenant’s exclusive remedy
shall be an action for damages. Notwithstanding any other provision of this Lease, Landlord shall not have any personal liability under this Lease. 

10.8 Landlord’s Right to Terminate. Notwithstanding any other provision of this Lease, Landlord or the Government may terminate
this Lease, in whole or in part, and without cost to the Government, if there has been a determination by either (i) the Director of NASA Ames Research Center, (ii) the Assistant Administrator for Infrastructure and Administration, or
(iii) the Director of the Facilities Engineering and Real Property Division that the interests of the national space program, the national defense or public welfare require termination of this Lease, and Landlord or the Government delivers to
Tenant at least thirty (30) days prior written notice of such determination. In the event termination of this Lease under this section 10.8, the Government shall make a pro rata adjustment of any advance rent paid by Tenant. 

ARTICLE 11 
 Damage or
Destruction 
 11.1 Restoration. If a fire or other casualty occurs on the Premises during the Term, Tenant shall promptly
undertake to determine the extent of the same and the estimated cost and time to perform repairs, restoration, replacement or alterations of the applicable portions of the Premises in accordance with the provisions of this Lease. Tenant shall notify
Landlord of Tenant’s estimation of such cost and time as soon as reasonably practicable, but in no event later than sixty (60) days after the occurrence of the fire or other casualty. If the Premises, or any part thereof, is damaged by
fire or other casualty during the Term and this Lease is not terminated pursuant to section 11.2, Tenant shall repair such damage and restore the Premises (including, if Tenant desires, as determined at Tenant’s sole discretion, any
alterations, additions, fixtures or improvements made by Tenant) to substantially the same condition in which the Premises existed before the occurrence of such fire or other casualty and this Lease shall, subject to this section 11.1, remain in
full force and effect. Tenant shall not be required to repair or replace any or all of Tenant’s movable furniture, equipment, trade fixtures and personal property. If such fire or other casualty damages the Premises or common areas of the
Property necessary for Tenant’s use and occupancy of the Premises and if such damage is not the result of the negligence or willful misconduct of Tenant or Tenant’s agents, employees, contractors, licensees or invitees, then, during the
period the Premises is rendered unusable by such damage, Tenant shall be entitled to a reduction in Base Rent in the proportion that the area of the Premises rendered unusable by such damage bears to the total area of the Premises. Landlord shall
not be obligated to repair any damage to, or to make any replacement of, the Premises or any part thereof, or any of Tenant’s movable furniture, equipment, trade fixtures or personal property in the Premises. If there are proceeds of insurance
in excess of that required to repair or replace the Premises as required by this section 11.1, upon receipt by Landlord of satisfactory evidence that the repair work required under this section 11.1 has been fully completed and paid for and that the
last day for filing any mechanic’s or materialmen’s liens has passed without the filing of any, or if filed, any such lien has been released, any remaining amount of such proceeds of insurance shall be paid to Landlord and Tenant, as their
respective interests may appear. If a fire or other casualty occurs, there is a substantial possibility that immediate emergency repairs will be required to 

  

					
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eliminate defective or dangerous conditions and to comply with Applicable Laws or Environmental Law pending settlement of insurance claims and prior to procuring bids for performance of repair
work. Notwithstanding any provision of this Article 11 to the contrary, Tenant shall promptly undertake such emergency repair work after a fire or other casualty as is necessary or appropriate under the circumstances to eliminate defective or
dangerous conditions and to comply with Applicable Laws or Environmental Law. 
 11.2 Termination of Lease. If the Premises, or any
part thereof, is damaged by fire or other casualty during the Term and (a) such fire or other casualty occurs during the last twelve (12) months of the Term and the repair and restoration work to be performed by Tenant in accordance with
section 11.1 cannot, as reasonably estimated by Tenant, be completed within two (2) months after the occurrence of such fire or other casualty, or (b) the cost of the repair and restoration work to be performed by Tenant in accordance with
section 11.1: (i) exceeds either two hundred fifty thousand dollars ($250,000) of insured loss or fifty thousand dollars ($50,000) of uninsured loss (including any applicable deductibles), (ii) exceeds the amount of insurance proceeds
received by or payable to Tenant in connection with such fire or other casualty, or (iii) will take longer than one hundred twenty (120) days to repair as reasonably determined by Tenant, then, in any such event, Tenant shall have the
right, by giving written notice to Landlord within sixty (60) days after the occurrence of such fire or other casualty, to terminate this Lease as of the date of such notice, provided that, in the event of such termination, and if requested to
do so by Landlord in writing, Tenant shall assign to Landlord the right to receive all proceeds of the insurance maintained by Tenant pursuant to section 8.2(d), excluding any proceeds relating to any alterations or improvements paid for by Tenant
and any of Tenant’s equipment, trade fixtures and other personal property. If Tenant does not exercise the right to terminate this Lease in accordance with this section 11.2, Tenant shall repair such damage and restore the Premises in
accordance with section 11.1 and this Lease shall, subject to section 11.1, remain in full force and effect. 
 ARTICLE 12 

Eminent Domain 
 12.1
Condemnation. Landlord shall have the right to terminate this Lease if any part of the Premises or any substantial part of the Property (whether or not it includes the Building or the Premises) is taken by exercise of the power of eminent
domain before the Commencement Date or during the Term. Tenant shall have the right to terminate this Lease if a substantial portion of the Premises is taken by exercise of the power of eminent domain before the Commencement Date or during the Term
and the remaining portion of the Premises is not reasonably suitable for Tenant’s purposes. In each such case, Landlord or Tenant shall exercise such termination right by giving written notice to the other within thirty (30) days after the
date of such taking. If either Landlord or Tenant exercises such right to terminate this Lease in accordance with this section 12.1, this Lease shall terminate as of the date of such taking. If neither Landlord nor Tenant exercises such right to
terminate this Lease in accordance with this section 12.1, this Lease shall terminate as to the portion of the Premises so taken as of the date of such taking and shall remain in full force and effect as to the portion of the Premises not so taken,
and the Base Rent shall be reduced as of the date of such taking in the proportion that the area of the Premises so taken bears to the total area of the Premises. If all of the Premises are taken by exercise of the power of eminent domain before the
Commencement Date or during the Term, this Lease shall terminate as of the date of such taking. 

  

					
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 12.2 Award. If all or any part of the Premises is taken by exercise of the power of
eminent domain, all awards, compensation, damages, income, rent and interest payable in connection with such taking shall, except as expressly set forth in this section 12.2, be paid to and become the property of Landlord, and Tenant hereby assigns
to Landlord all of the foregoing. Without limiting the generality of the foregoing, Tenant shall have no claim against Landlord or the entity exercising the power of eminent domain for the value of the leasehold estate created by this Lease or any
unexpired Term. Tenant shall have the right to claim and receive directly from the entity exercising the power of eminent domain only the share of any award determined to be owing to Tenant for the taking of improvements installed in the portion of
the Premises so taken by Tenant at Tenant’s sole cost and expense based on the unamortized cost actually paid by Tenant for such improvements, for the taking of Tenant’s movable furniture, equipment, trade fixtures and personal property,
for loss of goodwill, for interference with or interruption of Tenant’s business, or for removal and relocation expenses. 
 12.3
Temporary Use. Notwithstanding sections 12.1 and 12.2 to the contrary, if the use of all or any part of the Premises is taken by exercise of the power of eminent domain during the Term on a temporary basis for a period less than the Term
remaining after such taking, this Lease shall continue in full force and effect, Tenant shall continue to pay all of the rent and to perform all of the covenants of Tenant in accordance with this Lease, to the extent reasonably practicable under the
circumstances, and the condemnation proceeds in respect of such temporary taking shall be paid to Tenant. 
 12.4 Definition of
Taking. As used herein, a “taking” means the acquisition of all or part of the Property for a public use by exercise of the power of eminent domain or voluntary conveyance in lieu thereof and the taking shall be considered to occur as
of the earlier of the date on which possession of the Property (or part so taken) by the entity exercising the power of eminent domain is authorized as stated in an order for possession or the date on which title to the Property (or part so taken)
vests in the entity exercising the power of eminent domain. 
 ARTICLE 13 

Subordination and Sale 

13.1 Subordination. This Lease shall be subject and subordinate at all times to the lien of all mortgages, deeds of trust, easements,
rights of way and other matters affecting title to the Property (whether or not of record) which may now exist or hereafter be placed on or against the Property or on or against Landlord’s interest or estate therein, all without the necessity
of having further instruments executed by Tenant to effect such subordination. Notwithstanding the foregoing, in the event of a foreclosure of any such mortgage or deed of trust or of any other action or proceeding for the enforcement thereof, or of
any sale thereunder, this Lease shall not be terminated or extinguished, nor shall the rights and possession of Tenant hereunder be disturbed, if no Event of Default then exists under this Lease, and Tenant shall attorn to the person who acquires
Landlord’s interest hereunder through any such mortgage or deed of trust. Tenant agrees to execute, acknowledge and deliver upon demand such further instruments evidencing such subordination of this Lease to the lien of all such mortgages and
deeds of trust as may reasonably be required by Landlord. 

  

					
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 13.2 Sale of the Property. If the original Landlord hereunder, or any successor owner of
the Property, sells or conveys the Property, all liabilities and obligations on the part of the original Landlord, or such successor owner, under this Lease accruing after such sale or conveyance shall terminate and the original Landlord, or such
successor owner, shall automatically be released therefrom, and thereupon all such liabilities and obligations shall be binding upon the new owner. Tenant agrees to attorn to such new owner. 

13.3 Estoppel Certificate. At any time and from time to time, Tenant shall, within ten (10) days after written request by
Landlord, execute, acknowledge and deliver to Landlord a certificate certifying: (a) that this Lease is unmodified and in full force and effect (or, if there have been modifications, that this Lease is in full force and effect as modified, and
stating the date and nature of each modification); (b) the Commencement Date and the Expiration Date determined in accordance with Article 2 and the date, if any, to which all rent and other sums payable hereunder have been paid; (c) that
no notice has been received by Tenant of any default by Tenant hereunder which has not been cured, except as to defaults specified in such certificate; (d) that Landlord is not in default under this Lease, except as to defaults specified in
such certificate; and (e) such other matters as may be reasonably requested by Landlord or any actual or prospective purchaser or mortgage lender. Any such certificate may be relied upon by Landlord and any actual or prospective purchaser or
mortgage lender of the Property or any part thereof. At any time and from time to time, Tenant shall, within ten (10) days after written request by Landlord, deliver to Landlord copies of all current financial statements (including a balance
sheet, an income statement, and an accumulated retained earnings statement), annual reports, and other financial and operating information and data of Tenant prepared by Tenant in the course of Tenant’s business. Unless available to the public,
Landlord shall disclose such financial statements, annual reports and other information or data only to actual or prospective purchasers or mortgage lenders of the Property or any part thereof, and otherwise keep them confidential unless other
disclosure is required by law. 
 ARTICLE 14 

Notices 
 14.1
Method. Except as otherwise specifically provided in this Lease, all requests, approvals, consents, notices and other communications under this Lease shall be properly given only if made in writing and either deposited in the United States
mail, postage prepaid, certified with return receipt requested, or delivered by hand (which may be through a messenger or recognized delivery, courier or air express service), or sent via facsimile or electronic mail, and addressed to the applicable
party as specified in the Basic Lease Information (or to such other personnel or place as a party may from time to time designate in a written notice to the other party). Such requests, approvals, consents, notices and other communications
shall be effective on the date: of receipt (evidenced by the certified mail receipt) if delivered by United States mail; of hand delivery if hand delivered; or of transmission as evidenced by a machine – generated receipt or proof of
transmission if sent via facsimile or electronic mail. If any such request, approval, consent, notice or other communication is not received or cannot be delivered due to a change in the address of the receiving party of which notice was not
previously given to 

  

					
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		  	-26-	  	

 
the sending party or due to a refusal to accept by the receiving party, such request, approval, consent, notice or other communication shall be effective on the date delivery is attempted. Any
request, approval, consent, notice or other communication under this Lease may be given on behalf of a party by the attorney for such party. 

14.2 Close Calls and Mishaps. 

(a) For purposes of this Lease, the following terms shall have the following meanings (i) “Close Call” shall mean an occurrence
or a condition of employee concern in which there is no injury, or only minor injury requiring first aid, or damage to property or equipment of less than one thousand dollars ($1,000), but which possesses a potential to cause a Mishap (as defined
below); and (ii) “Mishap” shall mean an unplanned event on or about the Property and arising from the acts or omissions of Tenant or its employees, agents, contractors or invitees that results in at least one (1) of the
following: (1) injury to any person; (2) damage to public or private property (including foreign property); (3) occupational injury or occupational illness to any person; or (4) failure of a NASA mission. If, in Tenant’s
discretion, Tenant believes that a Close Call or Mishap may become highly visible outside of Tenant’s organization (such as by the media or a governmental agency), then Tenant shall promptly notify Landlord by telephoning the NASA Ames Safety,
Health and Medical Services Division at 650 – 604 – 5602. 
 (b) In addition, if a Mishap involves the death of an employee, or
the hospitalization for inpatient care of three (3) or more employees, then as soon as possible after the Mishap but in no event more than eight (8) hours after Tenant has knowledge of any such Mishap, Tenant shall notify both the
Occupational Safety and Health Administration (“OSHA”) by telephoning the area office nearest the site of the Mishap or OSHA’s toll-free number, 800 – 321 – 6742 and the NASA Ames Safety, Health and Medical Services Division
at 650 – 604 – 5602. If Tenant obtains knowledge of a fatality or hospitalization of three (3) or more employees after the eight (8) hour period described above, Tenant shall notify the foregoing offices as soon as possible but
within thirty (30) days of the Mishap. 
 (c) The Director of NASA Ames Research Center reserves the right to investigate any Mishap in
accordance with Landlord’s policies and procedures. 
 ARTICLE 15 

Miscellaneous 
 15.1
General. The words “Landlord” and “Tenant” as used herein shall include the plural as well as the singular. The words “include.” “includes” and “including” shall be deemed to be followed by
the phrase “without limitation.” If there is more than one Tenant, the obligations hereunder imposed upon Tenant shall be joint and several. Time is of the essence of this Lease and each and all of its provisions. This Lease shall benefit
and bind Landlord and Tenant and the permitted personal representatives, heirs, successors and assigns of Landlord and Tenant. If any provision of this Lease is determined to be illegal or unenforceable, such determination shall not affect any other
provision of this Lease and all such other provisions shall remain in full force and effect. Tenant shall not record this Lease or any memorandum or short form of it. 

  

					
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 15.2 No Waiver. The waiver by Landlord or Tenant of any breach of any covenant in this
Lease shall not be deemed to be a waiver of any subsequent breach of the same or any other covenant in this Lease, nor shall any custom or practice which may grow up between Landlord and Tenant in the administration of this Lease be construed to
waive or to lessen the right of Landlord or Tenant to insist upon the performance by Landlord or Tenant in strict accordance with this Lease. The subsequent acceptance of rent hereunder by Landlord or the payment of rent by Tenant shall not waive
any preceding breach by Tenant of any covenant in this Lease, nor cure any Event of Default, nor waive any forfeiture of this Lease or unlawful detainer action, other than the failure of Tenant to pay the particular rent so accepted, regardless of
Landlord’s or Tenant’s knowledge of such preceding breach at the time of acceptance or payment of such rent. 
 15.3
Exhibits. The exhibits and any other attachments specified in the Basic Lease Information are attached to and made a part of this Lease. 

15.4 Broker(s). Tenant warrants and represents to Landlord that Tenant has negotiated this Lease directly with Landlord and has not
authorized or employed, or acted by implication to authorize or to employ, any other real estate broker to act for Tenant in connection with this Lease. 

15.5 Waivers of Jury Trial and Certain Damages. Landlord and Tenant each hereby expressly, irrevocably, fully and forever releases,
waives and relinquishes any and all right to trial by jury and any and all right to receive punitive, exemplary and consequential damages from the other (or any past, present or future member, trustee, director, officer, employee, agent,
representative, or advisor of the other) in any claim, demand, action, suit, proceeding or cause of action in which Landlord and Tenant are parties, which in any way (directly or indirectly) arises out of, results from or relates to any of the
following, in each case whether now existing or hereafter arising and whether based on contract or tort or any other legal basis: This Lease; any past, present or future act, omission, conduct or activity with respect to this Lease; any transaction,
event or occurrence contemplated by this Lease; the performance of any obligation or the exercise of any right under this Lease; or the enforcement of this Lease. Landlord and Tenant reserve the right to recover actual or compensatory damages, with
interest, attorneys’ fees, costs and expenses as provided in this Lease, for any breach of this Lease. 
 15.6 Entire Agreement.
There are no oral agreements between Landlord and Tenant affecting this Lease, and this Lease supersedes and cancels any and all previous negotiations, arrangements, brochures, offers, agreements and understandings, oral or written, if any, between
Landlord and Tenant or displayed by Landlord to Tenant with respect to the subject matter of this Lease, the Premises or the Property. There are no commitments, representations or assurances between Landlord and Tenant or between any real estate
broker and Tenant other than those expressly set forth in this Lease and all reliance with respect to any commitments, representations or assurances is solely upon commitments, representations and assurances expressly set forth in this Lease. This
Lease may not be amended or modified in any respect whatsoever except by an agreement in writing signed by Landlord and Tenant. 
 15.7
Governing Law. Except to the extent the same may be in conflict with the laws of the United States, the laws of the State of California shall govern the validity, construction and effect of this Lease. In instances where the laws of the
United States refer to the laws of the state applicable to a transaction, such reference shall be made to the laws of the State of California, including California Civil Code §§1542, 1951.2 and 1951.4. 

  

					
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 15.8 Confidentiality. Tenant shall hold all Confidential Information (as defined below) in
strict confidence and, except as specifically set forth in this section 15.8 or to the extent as may be required by an order of a court of competent jurisdiction, shall not disclose, or permit the disclosure of, any Confidential Information to any
third person without the prior written approval of Landlord, which approval may be given or withheld in Landlord’s sole and absolute discretion. Tenant may disclose Confidential Information to its officers, directors, shareholders, partners,
members, managers, employees, contractors, legal counsel, accountants, lenders or financial advisers with a need to have access to such information and who have signed confidentiality agreements or are otherwise bound by confidentiality obligations
at least as restrictive as those contained herein. Tenant shall immediately notify Landlord upon receipt of any request or demand from any third person for any Confidential Information or the discovery of any loss or unauthorized disclosure of the
Confidential Information, and Tenant shall cooperate with Landlord to permit Landlord to exhaust all challenges to the disclosure of Confidential Information (including, without limitation, seeking to quash a subpoena or seeking a protective order).
Tenant acknowledges that the Confidential Information is not necessarily in the public domain by virtue of the fact that Landlord is a Federal agency, and Tenant nevertheless agrees to be bound by the provisions of this section 15.8. As used in this
Lease, the phrase “Confidential Information” shall mean this Lease, any of its terms or conditions, and all other information or other matter learned, used, furnished, disclosed or generated (or hereafter learned, used, furnished,
disclosed or generated) by either party pursuant to this Lease or during the negotiations leading to this Lease, provided that nothing contained in this Section 15.8 shall prohibit Tenant from publicly disclosing this Lease to the extent
required by applicable securities or other laws, provided that nothing contained in this Section 15.8 shall prohibit Tenant from publicly disclosing this Lease to the extent required by applicable securities or other laws. 

15.9 Anti – Deficiency Act. Landlord’s ability to perform its obligations under this Lease is subject to the availability of
appropriated funds. Nothing in this Lease commits the United States Congress to appropriate funds for the purposes stated herein (pursuant to the Anti-Deficiency Act, 31 U.S.C. §1341). 

IN WITNESS WHEREOF, Landlord and Tenant have executed this Lease as of the date specified in the Basic Lease Information. 

 

									
	Tenant:	 		 	Landlord:
			
	 BLOOM ENERGY CORPORATION, a

Delaware corporation
	 		 	 NATIONAL AERONAUTICS AND
 SPACE
ADMINISTRATION, an Agency of
 the United States

					
	By	 	/s/ William H. Kurtz	 		 	By	 	/s/ S. Pete Worden
		 	 William H. Kurtz
	 		 		 	S. Pete Worden
		 	Chief Financial Officer	 		 		 	Director, Ames Research Center

  

					
	BE 543 154 EUL Final 120511	  		  	SAA2 – 402658
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 EXHIBIT A 

Site Plan; Plan Outlining the Building 543 Premises 

This site plan is used solely for the purpose of identifying the approximate location and size of the Premises, including the approximate location and size of
the Building 543 Premises and the Restricted Area. Building sizes, site dimensions, access, common and parking areas, and existing tenants and locations are subject to change at Landlord’s discretion. 

 
 

 

  

					
	BE 543 154 EUL Final 120511	  		  	SAA2 – 402658
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 EXHIBIT A-l 

Plans Outlining the Building 154 Premises 

These site plans or floor plans are used solely for the purpose of identifying the approximate location and size of the Building 154 Premises. Building sizes,
site dimensions, access, common and parking areas, and existing tenants and locations are subject to change at Landlord’s discretion. 
  

 

  

					
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 EXHIBIT B 

Description of the TI Work 
 Painting 

Replace carpets 
 New furniture and cabinets in break room 

Install IT network system (Cisco switches and routers) 
 Install
badge readers on external doors that will be tied into the Ames Security system 
 Install separate water meter 

  

					
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 EXHIBIT C 

Support Agreement 

[Consists of three pages immediately following this page] 

  

					
	BE 543 154 EUL Final 120511	  		  	SAA2 – 402658
		  	-1-	  	

 FIRST AMENDMENT TO NASA AMES RESEARCH 

CENTER ENHANCED USE LEASE 

This First Amendment to NASA Ames Research Center Enhanced Use Lease (the “Amendment”) is made as of November 1, 2012 (the
“Effective Date”), by and between the NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, an Agency of the United States, acting by and through Ames Research Center located at Moffett Field, California (“Landlord”), and BLOOM ENERGY
CORPORATION, a Delaware corporation (“Tenant”), with reference to the following facts: 
 A. Landlord and Tenant entered into that
certain NASA Ames Research Center Enhanced Use Lease, dated as of December 5, 2011 (SAA2 - 402658) (the “Lease”). Each capitalized term used in this Amendment, but not defined herein, shall have the meaning ascribed to it in the
Lease. 
 B. Tenant desires to construct a building (containing approximately 3,375 square feet of space) (such building, together with all
other work related thereto as shown on the construction drawings for such building, is referred to collectively herein as the “Additional Building”) on the real property included within the Building 543 Premises. Landlord is willing to
allow Tenant to construct the Additional Building on the terms and conditions of this Amendment. 
 C. Landlord has informed Tenant that new
agency guidance is being promulgated regarding the disposal of hazardous waste generated by tenants. The parties desire to revise the Lease to conform to such guidance. 

NOW, THEREFORE, the parties agree as follows: 

1. Construction of the Additional Building. 

(a) Pursuant to section 7.1 of the Lease, Landlord hereby consents to Tenant’s construction of the Additional Building subject to the
following conditions precedent, which must be satisfied or waived in writing by Landlord before construction of the Additional Building (or any work in connection therewith) can begin: (1) Landlord shall have approved a complete set of
construction drawings for the Additional Building as required by section 7.1 of the Lease (including all other information required pursuant to section 7.1 of the Lease); (2) Tenant shall have paid to Landlord all fees and other amounts due to
Landlord (if any) under the Lease, including the fee to issue the Permit (as defined below); and (3) Landlord’s Chief Building Official shall have issued to Tenant a construction permit for the Additional Building and to install a
temporary construction trailer on the Building 543 Premises as more particularly described in section 1(j) of this Amendment (the “Permit”). 

(b) Tenant shall: (i) commence construction of the Additional Building promptly after the date on which the Permit is issued to Tenant
(the “Permit Issue Date”); (ii) diligently prosecute the same to completion; (iii) comply with all Applicable Laws; (iv) obtain all necessary permits and approvals other than the Permit; and (v) use its reasonable
efforts to 

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	1	  	

 
complete the Additional Building as quickly as possible thereafter, which is expected to occur during the Construction Period (as defined below). During the Construction Period, Landlord has
agreed to reduce the monthly Base Rent applicable to the Additional Building as set forth on the amended Basic Lease Information attached to this Amendment as Exhibit 1. If the Additional Building is not completed during the Construction
Period, Tenant may continue to perform such work thereafter; provided, however, Tenant shall pay the full monthly Base Rent with respect to the Premises. As used in this Amendment, the phrase “Construction Period” means the period of time
beginning on the Effective Date and ending on the earlier of: (1) the date on which NASA’s Fire Marshal completes a final inspection of the Additional Building and determines that the Additional Building is substantially complete; or
(2) ninety (90) days following the Permit Issue Date. 
 (c) Tenant does not intend to obtain secured financing in connection with
the construction, use or occupancy of the Additional Building. Tenant understands and agrees that Landlord will not subordinate fee title to any financing. 

(d) At all times while work on the Additional Building is being performed, and in addition to the insurance coverage required under the Lease,
Tenant shall maintain comprehensive “all risk” or “special form” builder’s risk insurance, including vandalism and malicious mischief. Such builder’s risk insurance shall cover all portions of the Additional Building,
all materials and equipment stored at the Premises or the Property by Tenant or its agents, employees, contractors, invitees or licensees (collectively, “Tenant’s Related Entities”), and all materials and equipment that are in the
process of fabrication at the premises of any third party or that have been placed in due course of transit to the Premises when such fabrication or transit is at the risk of, or when title to or an insurable interest in such materials or equipment,
has passed to Tenant or Tenant’s Related Entities (excluding any tools and equipment, and property owned by the employees of Tenant’s Related Entities). Such builder’s risk insurance shall be written on a completed value basis in an
amount not less than the full estimated replacement cost of the Additional Building. 
 (e) Tenant shall perform all work in accordance with
all Applicable Laws, the recommendations of Tenant’s geotechnical, environmental, engineering and other construction consultants, and in a good and workmanlike manner using materials of a quality consistent with the nature of the other
improvements on the Premises. Tenant shall not construct any buildings or other structures outside the boundaries of the Premises or on, over or above any utilities of Landlord within or crossing the Premises. Tenant shall not use any portion of the
Property other than the Premises in connection with the construction of the Additional Building. 
 (f) Tenant shall prepare and maintain on
the Premises (i) on a current basis during the construction of the Additional Building, annotated construction drawings showing clearly all substantive changes, revisions and substitutions during such period of construction, and (ii) upon
the substantial completion of the Additional Building, as - built drawings showing clearly all changes, revisions and substitutions during the period of construction, including minor field changes and the final location of all mechanical equipment,
utility lines, ducts, outlets, structural members, walls, partitions and other significant features of the work. 

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	2	  	

 (g) All rights of Landlord to review, comment upon, approve, inspect or take any other action
with respect to the Premises, the Additional Building or the design or construction thereof are specifically for the benefit of Landlord and no other party. No review, comment, approval or inspection, required or permitted by, of, or to Landlord
hereunder shall give or be deemed to give Landlord any liability, responsibility or obligation for, in connection with, or with respect to, the design, demolition, construction, maintenance, repair, preservation, rehabilitation, reconstruction,
restoration or operation of the Premises or the Additional Building, or the removal and/or remediation of any Hazardous Materials on, in or from the Premises, nor shall any such approval or inspection be deemed to relieve Tenant of the sole
obligation and responsibility for the design, construction, maintenance, repair, preservation, rehabilitation, reconstruction, restoration, and operation of the Premises (including the Additional Building) and the removal and/or remediation of
Hazardous Materials. Similarly, no inspection performed or not performed by Landlord under this Lease shall: (i) give or be deemed to give Landlord any responsibility or liability with respect to the thing inspected, the work or the prosecution
thereof, or the design or construction of the work or any part thereof; (ii) constitute or be deemed to constitute a waiver of any of Tenant’s obligations or Tenant’s rights hereunder; or (iii) be construed as approval or
acceptance of the thing inspected or the prosecution thereof, or the design or construction of the work or any part thereof. 
 (h) Tenant
shall have no power to do any act or to make any contract that may create or be the foundation for any lien, mortgage or other encumbrance upon the reversion, fee interest or other estate of Landlord or of any interest of Landlord in the Premises.
Tenant shall notify all of its contractors that Tenant does not own fee title to the Premises (or any other portion of the Property), and such contractors shall be instructed to record any preliminary notice or other document related to any
mechanic’s or materialmen’s liens against only Tenant’s leasehold interest in the Premises and not against fee title to the Property. At least ten (10) days before the date on which construction begins or materials are delivered,
Tenant shall give written notice to Landlord of such date of commencement of construction or of the delivery of materials, as the case may be. Landlord shall then have the right to post and maintain on the Premises and other portions of the Property
any notices that are required to protect Landlord and Landlord’s interest in the Property from any liens for work and labor performed or materials furnished in completing the Additional Building. Nothing in this Amendment or the Lease shall be
deemed to be, or be construed in any way as constituting, the consent of or request by Landlord, expressed or implied, by inference or otherwise, to any person, firm or corporation, for the performance of any labor or the furnishing of any materials
for any construction, repairs, maintenance, replacement, alterations or redevelopment of or to the Premises or any part thereof, or as giving Tenant any right, power or authority to contract for or permit the rendering of any services or the
furnishing of any materials that might in any way give rise to the right to file any lien against Landlord’s interest in the Premises. 

(i) Tenant shall not suffer or permit any liens to stand against the Property or any part thereof by reason of any work, labor, services or
materials done for, or supplied to, or claimed to have been done for or supplied to Tenant. Tenant shall keep the Property free and clear of any and all mechanics’, materialmen’s and other liens for work done, services performed, materials
supplied or appliances used or furnished in or about the Premises in connection with any activities of Tenant on or about the Premises. If any such lien shall at any 

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	3	  	

 
time be filed, Tenant shall cause the same to be discharged of record within thirty (30) days prior to the date any such lien may be foreclosed upon. If Tenant fails to discharge or contest
such lien within such period and such failure shall continue for a period of fifteen (15) days after notice by Landlord, then, in addition to any other right or remedy of Landlord, Landlord may, but shall not be obligated to, procure the
discharge of the same either by paying the amount claimed to be due, by deposit in court, or by bonding. All amounts paid or deposited by Landlord for any of the aforesaid purposes, and all other expenses of Landlord and all necessary disbursements
in connection therewith, in defending any such action or in procuring the discharge of such lien, shall become due and payable by Tenant to Landlord promptly upon written demand therefor. 

(j) Provided that the Permit is issued to Tenant, Landlord hereby gives Tenant permission: (i) to use the Building 543 Premises during
the Construction Period as a materials storage and staging area to construct the Additional Building; and (ii) to install on the Building 543 Premises a temporary construction trailer in connection with the construction of the Additional
Building. Tenant shall remove the temporary construction trailer from the Property no later than the date which is thirty (30) days after NASA’s Fire Marshal completes a final inspection of the Additional Building and determines that the
Additional Building is substantially complete. 
 (k) Tenant shall construct the Additional Building by engaging contractors that pay the
prevailing wages in the area. 
 (l) Upon the expiration or earlier termination of the Lease, Tenant shall demolish and remove from the
Property the Additional Building and all other improvements now or hereafter constructed in connection therewith (including, without limitation, the slab, foundation and other improvements on or under the ground surface) (collectively, the
“Removal Work”). Tenant agrees that if Tenant fails to complete the Removal Work, and Landlord incurs any costs in connection therewith, Landlord may apply the Security Deposit to cover such costs. 

2. Amendments of the Lease. As of the Effective Date, the parties hereby agree to amend the Lease as follows: 

(a) The Basic Lease Information attached to the Lease is hereby deleted and replaced in its entirety with the Basic Lease Information attached
to this Amendment as Exhibit 1. Among other things, the amended Basic Lease Information sets forth the monthly Base Rent to be paid during construction of the Additional Building and after its completion. 

(b) The site plan depicting the Building 543 Premises attached to the Lease as Exhibit A is hereby deleted and replaced with the site
depicting the Building 543 Premises (including the proposed location of the Additional Building) attached to this Amendment as Exhibit 2. 

(c) The Support Agreement attached to the Lease as Exhibit C is hereby deleted and replaced with the Support Agreement attached to this
Amendment as Exhibit 3. 

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	4	  	

 (d) Section 4.3 of the Lease is hereby deleted and restated in its entirety as follows: 

“4.3 Environmental Requirements. Tenant understands that the Property is underlain by a plume of contaminated
groundwater that comprises two Superfund sites: the former Naval Air Station Moffett Field; and the Middlefield-Ellis-Whisman site. Tenant understands that the groundwater is contaminated with solvents and petroleum hydrocarbons. Tenant hereby
acknowledges receipt of the environmental reports listed on attached Exhibit D. Tenant hereby agrees that: (a) Tenant shall not conduct, or permit to be conducted, on the Premises any activity which is not a Permitted Activity;
(b) Tenant shall not use, store or otherwise handle, or permit any use, storage or other handling of, any Hazardous Material which is not a Permitted Material on or about the Premises; (c) Tenant shall obtain and maintain in effect all
permits and licenses required pursuant to any Environmental Law for Tenant’s activities on the Premises, and Tenant shall at all times comply with all applicable Environmental Law; (d) Tenant shall not engage in the storage, treatment or
disposal on or about the Premises of any Hazardous Material except for any temporary accumulation of waste generated in the course of Permitted Activities; (e) Tenant shall not install any aboveground or underground storage tank or any
subsurface lines for the storage or transfer of any Hazardous Material, except in accordance with Environmental Law, and Tenant shall store all Hazardous Materials in a manner that protects the Premises, the Buildings, the Property and the
environment from accidental spills and releases; (f) Tenant shall not cause any (and shall not allow any third party other than Landlord on the Premises during the Term to) release of any Hazardous Material or any condition of pollution or
nuisance on or about the Premises, whether affecting surface water or groundwater, air, the land or the subsurface environment; (g) Tenant shall promptly remove from the Premises any Hazardous Material introduced, or permitted to be introduced,
onto the Premises by Tenant which is not a Permitted Material and, on or before the date Tenant ceases to occupy the Premises, Tenant shall remove from the Premises all Hazardous Materials and all Permitted Materials handled by or permitted on the
Premises by Tenant; (h) if any release of a Hazardous Material to the environment, or any condition of pollution or nuisance, occurs on or about or beneath the Premises or either Building as a result of any act of Tenant or its agents,
employees, contractors, invitees or licensees, Tenant, at Tenant’s sole cost and expense, shall promptly undertake all remedial measures required to clean up and abate or otherwise respond to the release, pollution or nuisance in accordance
with all applicable Environmental Law; and (i) Tenant shall obtain its own identification number from the United States Environmental Protection Agency (and all applicable state and local agencies) and shall store, handle, transport and dispose
of all hazardous waste generated by Tenant 

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	5	  	

 on or about the Premises in accordance with all applicable Environmental Law. Landlord and
Landlord’s representatives shall have the right, but not the obligation, to enter the Premises at any reasonable time for the purpose of inspecting the storage, use and handling of any Hazardous Material on the Premises in order to determine
Tenant’s compliance with the requirements of this Lease and applicable Environmental Law. If Landlord gives written notice to Tenant that Tenant’s use, storage or handling of any Hazardous Material on the Premises may not comply with this
Lease or applicable Environmental Law, Tenant shall correct any such violation within five (5) days after Tenant’s receipt of such notice from Landlord to the extent required by Environmental Laws. Tenant shall indemnify and defend
Landlord against and hold Landlord harmless from all claims, demands, actions, judgments, liabilities, costs, expenses, losses, damages, penalties, fines and obligations of any nature (including reasonable attorneys’ fees and disbursements
incurred in the investigation, defense or settlement of claims) that Landlord may incur as a result of, or in connection with, claims arising from the presence, use, storage, transportation, treatment, disposal, release or other handling, on or
about or beneath the Premises, of any Hazardous Material existing on or about or beneath the Premises caused by Tenant or its agents, employees, contractors, invitees or licensees (collectively ‘Tenant Contamination’). Landlord hereby
agrees to release Tenant from, and shall not charge Tenant for, any liabilities, costs, expenses, losses, damages, penalties, fines or obligations of any nature as a result of, or in connection with any Hazardous Materials existing at the Property
that are not Tenant Contamination, except to the extent that Tenant or its employees, agents, contractors or invitees exacerbates or causes a release of any such existing Hazardous Materials. Except for the storage, handling, transportation
(including execution of manifests) and disposal of hazardous waste generated by Tenant on or about the Premises, Tenant’s activities that comply with the permitted use of the Premises set forth in the Basic Lease Information will be
included in NASA’s sitewide permits and plans, as applicable, such as the Spill Prevention Control and Countermeasures Plan, the Storm Water Pollution Prevention Plan, the above ground storage tank statement, the Sunnyvale Industrial Waste
Water permit, the Environmental Resources Document, and the Integrated Natural Resources Management Plan. Coverage in these and other sitewide plans is included in the cost of ISP Services (as defined in section 6.1). Tenant shall promptly supply
information to the NASA Environmental Office (Code JQ) that is needed to complete these documents, and comply with the conditions of these permits. Tenant, at its sole cost, is responsible for obtaining an identification number from the United
States Environmental Protection Agency, and obtaining hazardous materials storage permits and air permits required by Environmental Law for Tenant’s use of the Premises. The liability of Tenant under this section 4.3 shall survive the
termination of this Lease with respect to acts or omissions that occur before such termination.” 

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	6	  	

 (e) Section 8.2(d) of the Lease is hereby amended by adding the following sentence
immediately before the last section of section 8.2(d): 
 “The Full Insurable Replacement Value of the Additional Building initially
shall be four hundred fifty thousand dollars ($450,000.00).” 
 3. No Other Amendment; Conflicts. Except as set forth in this
Amendment, the provisions of the Lease remain in full force. If the provisions of this Amendment conflict with the provisions of the Lease, then the provisions of this Amendment shall prevail. 

IN WITNESS WHEREOF, Landlord and Tenant have executed this Amendment as of the Effective Date. 

 

									
	Tenant:	 		 	Landlord:
			
	 BLOOM ENERGY CORPORATION, a

Delaware corporation
	 		 	 NATIONAL AERONAUTICS AND
 SPACE
ADMINISTRATION, an Agency of
 the United States

					
	By 	 	/s/ William H. Kurtz	 		 	By 	 	/s/ S. Pete Worden
		 	 William H. Kurtz
 Chief Financial
Officer
	 		 		 	 S. Pete Worden
 Director, Ames Research
Center

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	7	  	

 EXHIBIT 1 TO FIRST AMENDMENT 

NASA AMES RESEARCH CENTER 

ENHANCED USE LEASE 

Amended Basic Lease Information 

Date: November 1, 2012. 
 Landlord: NATIONAL AERONAUTICS
AND SPACE ADMINISTRATION, an Agency of the United States, Ames Research Center located at Moffett Field, California. 
 Tenant: BLOOM ENERGY CORPORATION, a
Delaware corporation. 
 Premises (section 1.1): (a) The parcel of real property outlined in Exhibit A, containing approximately 73,939 square
feet (more or less) of land area, including Building 543 (containing approximately 9,166 square feet (more or less) of building space (“Building 543”)) and all other improvements owned by Landlord thereon (collectively, the “Building
543 Premises”); and (b) all of the space in Building 154 (“Building 154”) outlined in Exhibit A-1, containing approximately 14,359 square feet (more or less) of building area (the “Building 154 Premises”). The
Building 543 Premises and the Building 154 Premises are located at NASA Ames Research Center, Moffett Field, California. A site plan showing the locations of the Building 543 Premises and the Building 154 Premises is attached hereto as Exhibit
A. Tenant intends to construct an additional building on the Building 543 Premises (the “Additional Building”) in the location depicted on such site plan. Building 543, the Additional Building and Building 154 are individually referred
to herein as a “Building” and are collectively referred to herein as the “Buildings.” 
 Property (section 1.1): The land, the buildings
and other improvements known as NASA Ames Research Center, Moffett Field, California 94035-1000. 
 Term (section 2.1): Approximately three (3) years.

 Commencement Date (section 2.1): December 16, 2011. 

Expiration Date (section 2.1): December 31, 2014. 

Monthly Base Rent (dollars per month) (section 3.1): $42,351.61; provided, however, during the period beginning on November 1, 2012 and ending on
January 30, 2013 during which Tenant intends to construct the Additional Building, the monthly Base Rent for the Premises shall be reduced to $41,643.86. 

Security Deposit (section 3.3): $40,500.00. 

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	i	  	

			
	Rent Payment Address (section 3.7):	  	 NASA Shared Service Center (NSSC)-
 FMD Accounts
Receivable
 Attn: For the Accounts of Ames Research Center

(Agreement #SAA2-402658)
 Bldg. 1111, C Road

Stennis Space Center, MS 39529

 Permitted Use of the Premises (section 4.1): Bloom Energy will use and occupy the Building 543 Premises solely for research
and development, and testing, including as its research laboratory and to test its products. Bloom Energy will use and occupy the Building 154 Premises solely for office purposes; provided, however, Bloom Energy may use rooms 124, 125, 126, 128, 129
and 130 for minor assembly of wiring harnesses and piping. 
  

			
	Landlord’s Address (section 14.1):	  	 NASA Ames Research Center
 Ms. Mejghan K.
Haider, Mail Stop 204 – 2
 Bldg. 204, Rm 215
 P.O. Box
1
 Moffett Field, CA 94035-0001

		
	Tenant’s Address (section 14.1):	  	 Bloom Energy Corporation
 1252 Orleans Drive

Sunnyvale, CA 94089
 Attn: Mr. William H. Kurtz

 Exhibit A – Site Plan; Plan Outlining the Building 543 Premises 

Exhibit A-1 – Plans Outlining the Building 154 Premises 

Exhibit B – Description of the TI Work 
 Exhibit C –
Support Agreement 
 Exhibit D – List of Environmental Reports 

The foregoing Basic Lease Information is incorporated in and made a part of the Lease to which it is attached. If there is any conflict
between the Basic Lease Information and the Lease, the Basic Lease Information shall control. 
  

									
	 Tenant:
  

BLOOM ENERGY CORPORATION, a
 Delaware corporation
	 		 	 Landlord:
  

NATIONAL AERONAUTICS AND
 SPACE ADMINISTRATION, an

Agency of the United States

					
	By	 	/s/ William H. Kurtz	 		 	By	 	/s/ S. Pete Worden
		 	 William H. Kurtz
 Chief Financial
Officer
	 		 		 	 S. Pete Worden
 Director, Ames Research
Center

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	ii	  	

 EXHIBIT 2 TO FIRST AMENDMENT 

Revised Site Plan; Plan Outlining the Building 543 Premises 

(Supersedes Exhibit A to Lease) 
 This site
plan is used solely for the purpose of identifying the approximate location and size of the Premises, including the approximate location and size of the Building 543 Premises and the Restricted Area. Building sizes, site dimensions, access, common
and parking areas, and existing tenants and locations are subject to change at Landlord’s discretion. 
  
 

 

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	1	  	

 EXHIBIT 3 TO FIRST AMENDMENT 

Revised Support Agreement 

(Supersedes Exhibit C to Lease) 

[Consists of three pages immediately following this page] 

  

					
	BE 543 154 EUL 1st Amend Final 110112	  		  	SAA2 – 402658
		  	1	  	

 SECOND AMENDMENT TO NASA AMES RESEARCH 

CENTER ENHANCED USE LEASE 
 This
Second Amendment to NASA Ames Research Center Enhanced Use Lease (the “Amendment”) is made as of August 25. 2014 (the “Effective Date”), by and between the NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, an Agency of the
United States, acting by and through Ames Research Center located at Moffett Field, California (“Landlord”), and BLOOM ENERGY CORPORATION, a Delaware corporation (“Tenant”), with reference to the following facts: 

A. Landlord and Tenant entered into that certain NASA Ames Research Center Enhanced Use Lease, dated as of December 5, 2011 (SAA2 -
402658) (the “Lease”) Each capitalized term used in this Amendment, but not defined herein, shall have the meaning ascribed to it in the Lease. 

B. Tenant duly requested, and Landlord duly approved Tenant’s request to extend the Term as provided in section 2.1(b) of the Original
Lease. Tenant has requested that Landlord agree to extend the term for two (2) years. Landlord is willing to extend the Term on the terms and conditions of this Amendment. 

NOW, THEREFORE, the parties agree as follows: 

1. Amendments of the Lease. As of the Effective Date, the parties hereby agree to amend the Lease as follows: 

(a) The Basic Lease Information attached to the Lease is hereby deleted and replaced in its entirety with the Basic Lease Information attached
to this Amendment as Exhibit 1. Among other things, the amended Basic Lease Information reflects (1) the extension of the Term such that the Expiration Date is December 31, 2016. (2) the amount of monthly Gross Rent as of the
Effective Date. 
 2. No Other Amendment; Conflicts. Except as set forth in this Amendment, the provisions of the Original Lease
remain in full force. If the provisions of this Amendment conflict with the provisions of the Original Lease, then the provisions of this Amendment shall prevail. 

  

					
	BE 543 154 EUL 2nd Amend Final 082514	  		  	SAA2 – 402658
		  	1	  	

 IN WITNESS WHEREOF. Landlord and Tenant have executed this Amendment as of the Effective Date.

  

									
	 Tenant:
  

BLOOM ENERGY CORPORATION, a
 Delaware corporation
	 		 	 Landlord:
  

NATIONAL AERONAUTICS AND
 SPACE ADMINISTRATION, an Agency of

the United States

					
	By	 	/s/ William H. Kurtz	 		 	By	 	/s/ S. Pete Worden 
		 	 William H. Kurtz
 Chief Financial
Officer
	 		 		 	 S. Pete Worden 
 Director, Ames
Research Center

  

					
	BE 543 154 EUL 2nd Amend Final 082514	  		  	SAA2 – 402658
		  	2	  	

 EXHIBIT 1 TO SECOND AMENDMENT 

NASA AMES RESEARCH CENTER 

ENHANCED USE LEASE 

Amended Basic Lease Information 

Date: August 25, 2014. 
 Landlord: NATIONAL AERONAUTICS AND
SPACE ADMINISTRATION, an Agency of the United States. Ames Research Center located at Moffett Field, California. 
 Tenant: BLOOM ENERGY CORPORATION, a
Delaware corporation. 
 Premises (section 1.1): (a) The parcel of real property outlined in Exhibit A, containing approximately 73,939 square
feet (more or less) of land area, including Building 543 (containing approximately 9,166 square feet (more or less) of building space (“Building 543”)) and all other improvements owned by Landlord thereon (collectively, the “Building
543 Premises”); and (b) all of the space in Building 154 (“Building 154”) outlined in Exhibit A-1, containing approximately 14,359 square feet (more or less) of building area (the
“Building 154 Premises”). The Building 543 Premises and the Building 154 Premises are located at NASA Ames Research Center, Moffett Field, California. A site plan showing the locations of the Building 543 Premises and the Building 154
Premises is attached hereto as Exhibit A. Tenant constructed an additional building (approximately 3,375 square feet (more or less) on the Building 543 Premises (the “Additional Building”) in the location depicted on such site plan.
Building 543, the Additional Building and Building 154 are individually referred to herein as a “Building” and are collectively referred to herein as the “Buildings.” 

Property (section 1.1): The land, the buildings and other improvements known as NASA Ames Research Center, Moffett Field, California 94035-1000. 

Term (section 2.1): Approximately five (5) years. 

Commencement Date (section 2.1): December 16, 2011. 

Expiration Date (section 2.1): December 31, 2016. 

Monthly Base Rent (dollars per month) (section 3.1): $31,793.11 (based on $1.02 per square foot per month for Bldg. 543, (b) $1.04 per square foot per
month for Bldg. 154, (c) $0.17 per square foot per month for additional land (approximately 44.179 sf) which is the remainder of the total parcel less the normalized parcel for Bldg. 543). 

Security Deposit (section 3.3): $40,500.00. 

  

					
	BE 543 154 EUL 2nd Amend Final 082514	  		  	SAA2 – 402658
		  	i	  	

			
	Rent Payment Address (section 3.7):	  	 NASA Shared Service Center (NSSC)-
 FMD Accounts
Receivable
 Attn: For the Accounts of Ames Research Center

(Agreement #SAA2-402658)
 Bldg. 1111, C Road

Stennis Space Center, MS 39529

 Permitted Use of the Premises (section 4.1): Bloom Energy will use and occupy the Building 543 Premises solely for research
and development, and testing, including as its research laboratory and to test its products. Bloom Energy will use and occupy the Building 154 Premises solely for office purposes; provided, however, Bloom Energy may use rooms 124, 125, 126, 128, 129
and 130 for minor assembly of wiring harnesses and piping. 
  

			
	Landlord’s Address (section 14.1):	  	 NASA Ames Research Center
 Ms. Mejghan K.
Haider, Mail Stop 204 2
 Bldg. 204, Rm 215
 P.O. Box 1

Moffett Field, CA 94035-0001

		
	Tenant’s Address (section 14.1):	  	 Bloom Energy Corporation
 1252 Orleans Drive

Sunnyvale, CA 94089
 Attn: Mr. William H. Kurtz

 Exhibit A – Site Plan; Plan Outlining the Building 543 Premises 

Exhibit A-1 – Plans Outlining the Building 154 Premises 

Exhibit B – Description of the TI Work 
 Exhibit C –
Support Agreement 
 Exhibit D – List of Environmental Reports 

The foregoing Basic Lease Information is incorporated in and made a part of the Lease to which it is attached. If there is any conflict
between the Basic Lease Information and the Lease, the Basic Lease Information shall control. 
  

									
	 Tenant:
  

BLOOM ENERGY CORPORATION, a
 Delaware corporation
	 		 	 Landlord:
  

NATIONAL AERONAUTICS AND
 SPACE ADMINISTRATION, an

Agency of the United States

					
	By	 	/s/ William H. Kurtz	 		 	By	 	/s/ S. Pete Worden
		 	 William H. Kurtz
 Chief Financial
Officer
	 		 		 	 S. Pete Worden
 Director, Ames Research
Center

  

					
	BE 543 154 EUL 2nd Amend Final 082514	  		  	SAA2 – 402658
		  	ii	  	

 EXHIBIT 2 TO SECOND AMENDMENT 

Revised Site Plan; Plan Outlining the Building 543 Premises 

(Supersedes Exhibit A to Lease) 
 This site
plan is used solely for the purpose of identifying the approximate location and size of the Premises, including the approximate location and size of the Building 543 Premises and the Restricted Area. Building sizes, site dimensions, access, common
and parking areas, and existing tenants and locations are subject to change at Landlord’s discretion. 
  
 

 

  

					
	BE 543 154 EUL 2nd Amend Final 082514	  		  	SAA2 – 402658
		  	1	  	

 EXHIBIT 3 TO SECOND AMENDMENT 

Revised Support Agreement 

(Supersedes Exhibit C to Lease) 

  

					
	BE 543 154 EUL 2nd Amend Final 082514	  		  	SAA2 – 402658
		  	2	  	

 

 
 SUPPORT AGREEMENT 1 agreement number (Provided by Suppler SAA2-402658 2 superseded agreement no. 6. SUPPLYING ACTIVITY 3 name and
ADDRESS National Aeronautics and Space Administration Ames Research Center Morten Field, CA 94035-1000 NRP Business Development Specialist: Cynthia Carbon-Norman D major COMMAND NASA HQ, Science Mission Directorate, Washington DC. 3 effective date
October 1. 2014 4. expiration date (May be ‘indefinite’) September 30, 2015 6. RECEIVING ACTIVITY a name AND ADDRESS Bloom Energy Corporation 1252 Orleans Drive Sunnyvale, CA 94089 Attn: William Kurtz C MAJOR COMMAND 7. SUPPORT PROVIDED BY
SUPPLIER a SUPPOR (Specify what, when, where, and how much) Modified Net Rent (Includes ISP, except for Additional Land) From 10/01/14 - 12/31/14: Building 543 Premises (9,166 sf@ $1.46 sf/mo) Bldg. 543 Additional Land Area (No ISP, 44,179 sf @
$0.17 sf/mo) Bldg. 154 (14,359 sf @ $1.48 sf/mo) B543 Addition (ISP Only, 3,375 sf @ $0,44 sf/mo) Sub Total From 01/01/15 09/31/15 (3% CPI Increase begins on 01 01/15) Building 543 Premises (9,166 sf @ $1.49 sf/mo) Bidg. 543 Additional Land Area (No
ISP, 44.179 sf @ $0.18 sf/mo) Bldg. 154 (14,359 sf @ $1.51 sf/mo) B543 Addition (ISP Only, 3,375 sf (@ $0,44 sf/mo) Sub Total Demand Services (Due in Advance Quarterly): -Utilities Metered, Bldgs 543 & 154 (based on FY14 actual) Facilities
Services - Declined Janitorial Services Demand Services Total Grand Total Security Deposit ADDITIONAL SUPPORT REQUIREMENTS ATTACHED Market comps Market comps Market comps C BASIS FOR REIMBURSEMENT C ESTIMATED REIMBURSEMENT $ 40,147.08 $ 22,531.29 $
63,753.96 $ 4,455.00 $130,88733 $122,916.06 $ 71,569.98 $195,138.81 $ 13,365.00 Actual Cost Actual Cost $402,989.85 $330,000.00 $ 2,000 00 $ -0- Yes $332,000.00 $865,877.18 Paid in FY12, carryover into FY13 $ 40,500.00 No S. SUPPLYING COMPONENT a
COMPTROLLER SIGNATURE n/a b DATE SIGNED n/a c. APPROVING AUTHORITY (1) Typed Name Paul Agnew (2) Organization Chief Financial Officer (4) Signature 10. TERMINATION is terminated pnor to scheduled expiration data) (3) Telephone Number (650) 604-1301
(5) Date Signed 9. RECEIVING COMPONENT a COMPTROLLER SIGNATURE n/a b DATE SIGNED n/a c. APPROVING AUTHORITY (1) Typed Name William H. Kurtz. Chief Financial Officer (2) Organization Bloom Energy Corporation (4) Signature (3) Telephone Number (408)
543-1550 (5) Date Signed 3 APPROVING AUTHORITY SIGNATURE D DATE SIGNED a APPROVING AUTHORITY SIGNATURE D DATE SIGNED 00 FORM 1144, NOV 2001 PREVIOUS EOTIONS MAY BE USED Page 1 of 3 

 

 
 11. GENERAL PROVISIONS (Complete blank spaces and add additional general provision as appropriate e.g. exceptions to printed provisions,
additional paths to this agreement, billing and reimbursement instructions) a. The receiving components will provide the supplying component projections of requested support (significant changes in the receiving components support requirements
should be submitted to the supplying component in a manner that will permit timely modification of resources requirements) b. It is the responsibility of supplying component to bring any required change in support to the attention of prior to
changing or cancelling support c. The component providing reimbursable support in this agreement will submit statements of costs to d. All rates expressing the unit cost of services provided in this agreement are base on current rates which may be
subject to change for uncontrollable reasons, such as legislation, DoD directives, and commercial utility rate increases The receiver will be notified immediately of such rate changes that must be passed through to the support receivers e. This
agreement may be cancelled at any time by mutual consent of the parties concerned This agreement may also be canceled by either party upon giving at least 180 days written notice to the other party f. In case of mobilization or other emergency this
agreement remain in force only within supplier’s capabilities ADDITIONAL SUPPORT REQUIERMENTS ATTACHED Yes No 12. SPACIFIC PROVISION (As a appropriate e.g. location n and size of occupied facilities, unique support and receiver responsibilities
conditions, requirements, quantity standards, and catena for measurement/ reimbursement of unique requirements ) ADDITONAL SUPPORT REQUIREMENTS ATTACHED Yes No DD FORM 1144 MOV 2001 PREVIOUS EDITIONS MAY BE USED Page 2 of 3 

					
	 13. ADDITIONAL PROVISIONS (Use this space to
continue general and/or specific provisions as needed)
  
  

 
  
  

	DD FORM 1144, NOV 2001	 	PREVIOUS EDITIONS MAY BE USED	 	Page 3 of 3

 Revised Human Health Risk Assessment NASA Research Park 

Moffett Field, California 
 MACTEC 

 Revised Human Health Risk Assessment NASA Research Park 

Moffett Field, California 
 Prepared for 

PAl/ISSi 
 NASA Ames Research Center Moffett Field, California
94035-1100 
 MACTEC Project No. 56042 3.6 
 David
Brenner, Ph.D. 
 Principal Environmental Scientist 
 Matthew
Walraven 
 Staff Environment Scientist 
 July 28, 2003

 Engineering and Consulting 
 MACTEC, Inc. 90 Digital Drive

 Novato, CA 94949 - (415) 883-0112 

  
 2 

 Revised Human Health Risk Assessment NASA Research Park 

Moffett Field, California 
 MACTEC Project No. 56042 3.6

 This document was prepared by MACTEC Engineering and Consulting, Inc. (MACTEC, formerly Harding ESE, Inc.), at the direction of PAI/ISSi for the sole use
of PAI/ISSi the only intended beneficiaries of this work. No other party should rely on the information contained herein without the prior written consent of PAI/ISSi and MACTEC. This report and the interpretations, conclusions, and recommendations
contained within are based in part on information presented in other documents that are cited in the text and listed in the references. Therefore, this report is subject to the limitations and qualifications presented in the referenced documents.

  
 3 

 CONTENTS 
  

							
	 LIST OF ACRONYMS
	  	 	7	 
	 1.0
	 	 INTRODUCTION
	  	 	9	 
	 2.0
	 	 BACKGROUND
	  	 	11	 
	 2.1
	 	 Physical Setting
	  	 	11	 
	 2.2
	 	 Groundwater Contamination
	  	 	11	 
	 2.3
	 	 Soil Contamination
	  	 	12	 
	 2.4
	 	 Previous Risk Assessment Evaluations
	  	 	12	 
	 3.0
	 	 DATA EVALUATION AND IDENTIFICATION OF CHEMICALS OF POIBNTIAL CONCERN
	  	 	14	 
	 3.1
	 	 Areas Defined for Evaluation of Risk
	  	 	14	 
	 3.2
	 	 Data Evaluation
	  	 	14	 
	 3.3
	 	 COPC Selection
	  	 	15	 
	 3.4
	 	 Background Evaluation of Air Concentration
	  	 	16	 
	 4.0
	 	 EXPOSURE ASSESSMENT
	  	 	17	 
	 4.1
	 	 Exposure Setting and Land Use
	  	 	17	 
	 4.2
	 	 Identification of Receptors and Pathways
	  	 	17	 
	 4.3
	 	 Potential Receptors
	  	 	18	 
	 4.4
	 	 Exposure Pathways
	  	 	18	 
	 4.5
	 	 Conceptual Site Models
	  	 	19	 
	 4.6
	 	 Exposure Point Concentrations
	  	 	19	 
	 4.7
	 	 Chemical Intake Estimates
	  	 	20	 
	 4.7.1
	 	 General Exposure Assumptions
	  	 	21	 
	 4.7.2
	 	 Exposure Parameters and Equations for Dermal Contact with Groundwater
	  	 	21	 
	 4.7.3
	 	 Groundwater Volatilization Model
	  	 	22	 
	 4.7.3.l
	 	 Differences between Draft Addendum and Revised Final HHRA
	  	 	24	 
	 4.7.4
	 	 Exposure Parameters and Equations for Inhalation of Volatiles from Groundwater
	  	 	25	 
	 5.0
	 	 TOXICITY ASSESSMENT
	  	 	26	 
	 5.1
	 	 Noncarcinogenic Toxicity Criteria
	  	 	26	 
	 5.2
	 	 Carcinogenic Toxicity Criteria
	  	 	27	 
	 5.3
	 	 Toxicity Criteria for the COPCs
	  	 	29	 
	 6.0
	 	 RISK CHARACTERIZATION
	  	 	35	 
	 6.1
	 	 Noncarcinogenic Hazard
	  	 	35	 
	 6.2
	 	 Cancer Risks
	  	 	36	 
	 6.3
	 	 Risk Characterization Results
	  	 	37	 
	 6.3.l
	 	 Risk Characterization Summary
	  	 	38	 
	 6.3.1.1
	 	 Differences between Draft Addendum and Revised HHRA
	  	 	41	 
	 6.3.2
	 	 Risk Estimated from Groundwater Volatilization Model
	  	 	41	 
	 6.3.3
	 	 Risk Estimated from Air Measurements
	  	 	42	 
	 6.4
	 	 Soil Target Cleanup Levels
	  	 	44	 
	 7.0
	 	 UNCERTAINTY EVALUATION
	  	 	45	 
	 7.1
	 	 Toxicity Criteria and Factors
	  	 	45	 
	 7.2
	 	 Exposure Pathways and Parameters
	  	 	45	 
	 7.3
	 	 Laboratory and Sampling Results
	  	 	46	 
	 7.4
	 	 Site Target Cleanup Levels
	  	 	46	 

  
 4 

							
	 7.5
	 	 Site Air Concentration Measurements
	  	 	46	 
	 7.6
	 	 Flux Measurements
	  	 	47	 
	 7.7
	 	 Calculation of Modeled Airborne VOC Concentrations
	  	 	48	 
	 7.8
	 	 Volatilization Model
	  	 	48	 
	 7.9
	 	 1,1-DCE Carcinogenicity Assessment
	  	 	49	 
	 7.10
	 	 TCE Health Risk Assessment
	  	 	49	 
	 7.11
	 	 Benzene Health Risk Assessment
	  	 	50	 
	 7.12
	 	 Factoring Out Vinyl Chloride Concentrations
	  	 	50	 
	 8.0
	 	 SUMMARY AND CONCLUSIONS
	  	 	50	 
	 9.0
	 	 LITERATURE CITED
	  	 	54	 
		
	 TABLES
	  			
			
	 1
	 	 Groundwater Wells Sampled
	  			
	 2
	 	 Statistical Data Summary of Chemicals in Groundwater
	  			
	 3
	 	 Locations of Air Samples Taken at NRP
	  			
	 4
	 	 Statistical Data Summary of Chemicals in Air
	  			
	 5
	 	 COPCs for Groundwater and Air
	  			
	 6
	 	 Statistical Data Summary for Chemicals in Background Air
	  			
	 7
	 	 Exposure Parameters for a Construction Worker
	  			
	 8
	 	 Exposure Parameters for an Indoor Worker
	  			
	 9
	 	 Exposure Parameters for Adult and Child Residents
	  			
	 10
	 	 Exposure Parameters for 30 yr Residential Receptor
	  			
	 11
	 	 Chemical Specific Derma) Factors
	  			
	 12
	 	 Site-Specific Soil and Groundwater Characteristics
	  			
	 13
	 	 Chemical Physical Properties
	  			
	 14
	 	 Volatilization Model Parameters
	  			
	 15
	 	 Toxicity Criteria for COPCs
	  			
	 16
	 	 Construction Worker Receptor; Risks and Hazards Estimated from Groundwater
Concentrations
	  			
	 17
	 	 Indoor Worker Receptor; Risks and Hazards Estimated from Groundwater Concentrations
	  			
	 18
	 	 Adult Resident (10 yr RME) Receptor; Risks and Hazards Estimated from Groundwater
Concentrations
	  			
	 19
	 	 Child Resident (10 yr RME) Receptor; Risks and Hazards Estimated from Groundwater
Concentrations
	  			
	 20
	 	 RME 30 yr Residential Receptor; Risks and Hazards Estimated from Groundwater
Concentrations
	  			
	 21
	 	 Construction Worker Receptor; Risks and Hazards Estimated from Measured Air
Concentrations
	  			
	 22
	 	 Indoor Worker Receptor; Risks and Hazards Estimated from Measured Air Concentrations
	  			
	 23
	 	 Adult Resident (10 yr RME) Receptor; Risks and Hazards Estimated from Measured Air
Concentrations
	  			
	 24
	 	 Child Resident (10 yr RME) Receptor; Risks and Hazards Estimated from Measured Air
Concentrations
	  			

  
 5 

							
	 25
	 	 RME 30 yr Residential Receptor; Risks and Hazards Estimated from Measured Air
Concentrations
	  			
	 26
	 	 Background Risks and Hazards Estimated from Measured BAAQMD Air Concentrations
	  			
	 27
	 	 Comparison of Cleanup Levels for Soil
	  			
	
	 PLATES
	  

			
	 l
	 	 Property and Parcel Location Map
	  			
	 2
	 	 Well Sample Location Map
	  			
	 3
	 	 Air Sample Location Map
	  			
	 4
	 	 Construction RME Risk
	  			
	 5
	 	 Construction CTE Risk
	  			
	 6
	 	 Construction RME HI
	  			
	 7
	 	 Construction CTE HI
	  			
	 8
	 	 Indoor Worker RME Risk
	  			
	 9
	 	 Indoor Worker CTE Risk
	  			
	 10
	 	 Indoor Worker RME HI
	  			
	 11
	 	 Indoor Worker CTE HI
	  			
	 12
	 	 Adult Resident (10 yr) RME Risk
	  			
	 13
	 	 Adult Resident (5 yr) CTE Risk
	  			
	 14
	 	 Adult Resident (10 yr) RME HI
	  			
	 15
	 	 Adult Resident (5 yr) CTE HI
	  			
	 16
	 	 Child Resident (10 yr) RME Risk
	  			
	 17
	 	 Child Resident (5 yr) CTE Risk
	  			
	 18
	 	 Child Resident (10 yr) RME HI
	  			
	 19
	 	 Child Resident (5 yr) CTE HI
	  			
	 20
	 	 Resident (30 yr) RME Risk
	  			
	 21
	 	 Resident, Adult (24 yr) HI
	  			
	 22
	 	 Resident, Child (6 yr) HI
	  			
		
	 FIGURES
	  			
		
	 Conceptual Site Model
	  			
		
	 APPENDIXES
	  			
			
	 A
	 	 SURFACE FLUX MEASUREMENT PROGRAM
	  			
	 B
	 	 CALCULATION OF EXPOSURE POINT CONCENTRATIONS GROUNDWATER DATA
	  			
	 D
	 	 AIR DATA
	  			
	 E
	 	 INTERMEDIATE CALCULATIONS FOR THE GROUNDWATER TO AIR VOLATILIZATION MODEL
	  			
	 F
	 	 RESPONSES TO COMMENTS
	  			

  
 6 

			
	 DISTRIBUTION

	
	 LIST OF ACRONYMS

		
	 1,1-DCA
	 	 1,1-Dichloroethane

	 1,1-DCE
	 	 1,1-Dichloroethylene, also called 1,1-Dichloroethene

	 1,2-DCA
	 	 1,2-Dichloroethane

	 1,1,1-TCA
	 	 1,1,1 -Trichloroethane

	 ABS
	 	 Dermal-Absorption factor

	 ADD
	 	 Average Daily Dose

	 AF
	 	 Soil-Adherence Factor

	 ASTM
	 	 American Society for Testing and Materials

	 AT
	 	 Averaging Time

	 B[a]P
	 	 Benzo(a)pyrene

	 BW
	 	 Body Weight

	 BTEX
	 	 Benzene, Toluene, Ethyl benzene, and Xylenes

	 Cal/EPA
	 	 California Environmental Protection Agency

	 cis-1,2-DCE
	 	 cis-1,2-Dichloroethylene, also called cis-1,2-Dichloroethene

	 cfm
	 	 cubic feet per minute

	 Cgw
	 	 Exposure point concentration (EPC) in groundwater

	 COPC
	 	 Chemical of Potential Concern

	 CSM
	 	 Conceptual Site Model

	 CTE
	 	 Central Tendency Estimate

	 DNA
	 	 Deoxyribonucleic acid, commonly called DNA with further description

	 DTSC
	 	 Department of Toxic Substances Control

	 EA
	 	 Endangerment Assessment

	 EBS
	 	 Environmental Baseline Survey

	 ED
	 	 Exposure Duration

	 EF
	 	 Exposure Frequency

	 EPC
	 	 Exposure Point Concentration

	 ET
	 	 Exposure Time

	 FOD
	 	 Frequency of Detection

	 FS
	 	 Feasibility Study

	 HEAST
	 	 Health Effects Assessment Summary Tables

	 HHAG
	 	 Human Health Assessment Group

	 HHRA
	 	 Human Health Risk Assessment

	 HI
	 	 Hazard Index

	 HLA
	 	 Harding Lawson Associates, now MACTEC

	 HQ
	 	 Hazard Quotient

	 IR
	 	 Ingestion Rate

	 IRIS
	 	 Integrated Risk Information System

	 IRS
	 	 Ingestion Rate for Soil

	 Kp
	 	 Dermal permeability constant

	 LADD
	 	 Lifetime Average Daily Dose

	 LMS
	 	 Linearized Multistage model

	 LOAEL
	 	 Lowest-Observed-Adverse-Effect Level

	 MCF
	 	 Mass Conversion Factor

	 MCL
	 	 Maximum Contaminant Level

  
 7 

			
	 MEW
	 	 Middlefield Ellis Whisman (Superfund Site)

	 MFA
	 	 Moffett Federal Airfield

	 MDL
	 	 Method Detection Limit

	 μg/kg
	 	 Micrograms per Kilogram

	 mg/kg
	 	 Milligrams per Kilogram

	 NAS
	 	 Naval Air Station

	 NASA
	 	 National Aeronautics and Space Administration

	 NCEA
	 	 National Center for Environmental Assessment

	 NOAEL
	 	 No-Observed-Adverse-Effect Level

	 NRP
	 	 NASA Research Park

	 PAH
	 	 Polycyclic Aromatic Hydrocarbon

	 PCB
	 	 Polychlorinated Biphenyl

	 PCE
	 	 Tetrachloroethene, also called Tetrachloroethlyene or Perchloroethylene

	 PEF
	 	 Particulate-Emission Factor

	 PPE
	 	 Personal Protective Equipment

	 PRG
	 	 Preliminary Remediation Goal

	 QA
	 	 Quality Assurance

	 QC
	 	 Quality Control

	 RA
	 	 Risk Assessment

	 RID
	 	 Reference Dose

	 RI
	 	 Remedial Investigation

	 RME
	 	 Reasonable Maximum Exposure

	 ROD
	 	 Record of Decision

	 RWQCB
	 	 Regional Water Quality Control Board

	 SA
	 	 Body Surface Area

	 SF
	 	 Slope Factor

	 SFo
	 	 Slope Factor, Oral

	 SFi
	 	 Slope Factor, Inhalation

	 SVOC
	 	 Semivolatile Organic Compound

	 TCE
	 	 Trichloroethene, also called Trichloroethylene

	 TCL
	 	 Target Cleanup Level

	 TPH
	 	 Total Petroleum Hydrocarbons

	 trans-1,2-DCE
	 	 trans-1,2-Dichloroethylene, also called trans-1,2-Dichloroeth

	 ITO
	 	 Total Toxic Organics

	 UCL
	 	 Upper Confidence Limit

	 USEPA
	 	 U.S. Environmental Protection Agency

	 UST
	 	 Underground Storage Tank

	 vc
	 	 Vinyl Chloride

	 VCF
	 	 Volume Conversion Factor

	 VF
	 	 Volatilization Factor

	 VFa
	 	 Volatilization Factor for VOCs from groundwater to ambient air

	 voe
	 	 Volatile Organic Compound

	 WATS
	 	 West-Side Aquifers Treatment System

	 WP
	 	 Work Plan

  
 8 

 1.0 INTRODUCTION 

MACTEC Engineering and Consulting, Inc. (MACTEC, formerly Harding ESE) has prepared this Human Health Risk Assessment (HHRA) to assess the health risks
associated with Parcels 1 through 9 and 12 through 19 of the NASA Research Park (NRP-Site). The NRP site, located in Moffett Field, CA, is comprised of 213 acres is being planned for redevelopment as a collaborative research and educational campus,
with associated facilities. For planning purposes, NRP was divided into 19 parcels as part of the Final Programmatic Environmental Impact Statement (DCE, 2002). The location of the parcels is shown in Plate 1. Based on their historical use and the
proposed future use, Parcels 1 through 8 and 12, 13, 14, 15, 17, 18, and 19 were selected for evaluation as part of the HHRA. No contamination sources have been identified in Parcels 9, 10, 11, and 16 and they have been eliminated from further
consideration. MACTEC conducted this assessment and prepared this report under contract to PAI/ISSi on behalf of NASA Ames Research Center. 
 Contaminated
groundwater is the primary environmental medium of concern at the Site. Exposure to chemicals in the groundwater is primarily the result of transport of volatile organic compounds (VOCs) from the groundwater to the ground surface. Once at the
surface, these VOCs enter the outdoor atmosphere or infiltrate the indoor building environment. The risks resulting from potential exposure to VOC vapors were calculated using (1) groundwater data, and (2) air quality data. Soil surface
flux measurements were used in .the selection of GW COPCs (see section 3.3 and Appendix A). 
 Although soil containing metals, PAHs, SVOCs, and VOCs, have
been detected, most of the source areas and surrounding soil have been removed. However, a residual soil data set (i.e., representing post-remediation conditions following the removal of contamination sources) was not available for this HHRA. This
HHRA is intended to reflect potential risks associated with current use and future development of the Site. Because a soil data set representing current chemical concentrations in soil at the five parcels could not be compiled, due to lack of
post-remediation soil samples, quantitative risks could not be estimated.’ Instead, a discussion of applicable target cleanup levels (TCLs) for soil is presented. Comparison of the TCLs to measured soil concentrations can then be used to
support any further removal action decisions. 
 Only exposure to groundwater and air were evaluated in this HHRA. This HHRA does not address potential
exposure to lead-based paint in soil as this issue will be addressed separately. Prior to building demolition, soil contaminated with lead will be removed to the Risk Based Screening Level (RBSL) of 200 ng/kg. 

This HHRA is consistent with the methods and assumptions presented in the HHRA Work Plan, NASA Research Park, Moffett Field, California (HLA, 2002), and is
based on risk assessment guidance provided by the U.S. Environmental Protection Agency (USEPA) and the California Environmental Protection Agency (Cal/EPA). As discussed below, the Work Plan activities were amended to include the collection of soil
flux samples. 
 The purpose of this HHRA is to provide guidance for development of the NRP parcels consistent with the land uses described in the Final
Environmental Impact Statement (FEIS) prepared by 

  
 9 

 
Design, Community, and Environment (DCE, 2002). Development of the site is planned to occur over the next eleven years, while ground water remediation will require between 20 and 100 years.
Therefore, it is expected that the developers of each site will conduct their own detailed, site-specific assessment as part of the proposed development. All requirements for environmental remediation levels for volatile organic compounds are set
forth in the MEW Record of Decision (VSEPA, 1989b) and these levels are not changed because of this HHRA. 
 This HHRA is organized as follows: 

 

	•	 	Section 1 - Introduction: Describes the organization and content of the HHRA. 

  

	•	 	Section 2 - Background: Describes the physical setting of Moffett Field and the groundwater and soil contamination at the Site. Previous risk assessments at Moffett Field are also discussed. 

 

	•	 	Section 3 - Data Evaluation and Selection of Chemicals of Potential Concern: Describes methods to select chemicals of potential concern evaluated in the HHRA. A description of the data sets used in the HHRA is also
included. 

  

	•	 	Section 4 - Exposure Assessment: Describes the potential exposed populations, exposure pathways, exposure assumptions, methods of assessing chemical uptake, and estimation of exposure point concentrations (see also
Appendix B). 

  

	•	 	Section 5 - Toxicity Assessment: Describes the types of adverse health effects and dose-response criteria used to assess the potential toxic effects for the chemicals of potential concern. Uncertainties used to
develop the toxicity criteria are also discussed. 

  

	•	 	Section 6 - Risk Characterization: Describes the qualitative and quantitative estimates of risk. 

  

	•	 	Section 7 - Uncertainty Evaluation: Presents and discusses uncertainties associated with the quantitative results of the assessment and input data and assumptions. 

 

	•	 	Section 8 - Summary and Conclusions: Presents a summary of the results of the HHRA. 

  

	•	 	Section 9 - References: Provides a list of references cited in the text. 

  
 10 

 2.0 BACKGROUND 

This section presents relevant information about Moffett Field and includes a description of the groundwater and soil contamination at the NRP Site. A summary
of previous risk assessments conducted for the Site is also included. 
 2.1 Physical Setting 

Moffett Field lies 35 miles south of San Francisco, 10 miles north of San Jose, and about 1mile south of San Francisco Bay. The facility encompasses about
2,000 acres in Santa Clara County and borders the cities of Mountain View and Sunnyvale, California. To the north of Moffett Field are saltwater evaporation ponds and wetlands associated with San Francisco Bay; Stevens Creek lies to the west; U.S.
Highway 101 runs along the southern perimeter; and Lockheed-Martin Aerospace facilities are located to the east. The Ames Campus is located in the northwest portion of Moffett Field. The area south of U.S. Highway 101 is industrial and includes a
group of companies located or formerly located in a 0.5 square-mile area bounded by East Middlefield Road, Ellis Street, Whisman Road, and U.S. Highway 101, referred to as the MEW Superfund Site. These companies are implementing remedial activities
for soil and groundwater contamination believed to originate within the MEW Superfund Site. Groundwater beneath the NRP parcels is impacted by migration of chemicals from the MEW Superfund Site and from past Navy operations at Moffett Field (Tetra
Tech, 1998). The groundwater plumes underneath the NRP parcels are referred to as the West Side Aquifer or Regional Plume. 
 Moffett Field was operated as
a NAS by the U.S. Military beginning on its date of commission in April 1933. The base was designated for closure as an active military base under the U.S. Department of Defense Base Realignment and Closure (BRAC) program. The base was transferred
in July 1994 to NASA, except for the military housing units and associated facilities, which were transferred to Onizuka Air Force Base. As described in the Moffett Field Comprehensive Use Plan, Environmental Assessment (Brady & Associates,
1994), portions of Moffett Field will be converted from their former military use and redeveloped as a laboratory and associated offices. Other portions of the NRP Site are proposed for development as a collaborative research and educational campus,
pursuant to the FEIS (DCE, 2002). 
 2.2 Groundwater Contamination 

The remedial investigation (RI) of the MEW area, concluded in 1988 (HL.A, 1988), demonstrated that VOCs, especially trichlorothene (TCE) and
1,1,1-trichloroethane (1,1,1-TCA), were the most frequently detected chemicals in groundwater. The MEW companies completed the RI, the feasibility study (FS), and the remedial design, and are currently conducting remedial action activities under
USEPA supervision. Construction of the MEW treatment system was completed and routine operations began in October 1998 (Tetra Tech, 1999a). 
 In addition
to the MEW Superfund Site, groundwater at the NRP was impacted by past Navy operations. Sources of groundwater contamination included a fuel storage tank farm, a former service station, a former aircraft wash rack sump, and a former dry cleaner. Of
these, the former dry cleaner and wash rack are considered the primary sources of VOC contamination. The Navy designed and installed the West Side Aquifers Treatment System (WATS) to extract VOCs and petroleum contamination from groundwater (Tetra
Tech, 1999b). 

  
 11 

 The VOCs in groundwater from the West Side Aquifer are being cleaned up to drinking water maximum contaminant
levels (MCLs; USEPA, 1989b). Water levels are measured on a quarterly basis, and groundwater sampling is conducted periodically by the Navy and the MEW Companies. 

2.3 Soil Contamination 
 Total petroleum hydrocarbons (TPH);
benzene, toluene, ethyl benzene, and xylenes (B1EX); metals; polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs); semivolatile organic compounds (SVOCs); and other VOCs such as 1,1,1-TCA, 1,1,-DCE, methylene chloride, and
acetone have been detected in soil at the NRP: Contaminated soil at NRP is primarily a result of previous leaks from underground storage tanks (USTs). Releases associated with the USTs are being actively investigated or monitored. Other sources that
may have contributed to soil contamination at the Site include sumps and oil/water separators, storage of hazardous wastes, a paint facility, capacitors, transformers, fuel pits, high-speed fuel hydrants, and a fuel pier. Most of the USTs, oil/water
separators, and sumps, and surrounding contaminated soils at the Site have been removed (HLA, 2000a; Harding ESE, 200Ja, b). Exposure to soil contamination was not evaluated; instead, applicable TCLs are presented in Section 6.4. 

2.4 Previous Risk. Assessment Evaluations 
 A Baseline HHRA was
conducted by the Navy to evaluate human health risks for potential future residential, occupational, and recreational receptors at Moffett Field and was included in the station-wide RI report (PRC, 1996) as well as the OU2 RI (IT, 1993a). In
addition, station-wide ecological risk assessments were conducted (PRC and MW, 1995 and 1997). Both of the site wide assessments focused on the wetland areas, the runway, and surrounding hangars and maintenance facilities and did not address the
areas occupied by the redevelopment property. The Baseline HHRA estimated cancer risks above lx 10-4 (or one-in-ten thousand) for residential and occupational receptors at some areas of the Site, suggesting that soil remediation may be necessary and
that treatment of the groundwater plume to MCLs would reduce the risk to acceptable levels. 
 In accordance with the MEW ROD, an Endangerment Assessment
(EA) was prepared for the MEW Site (including Moffett Field) to address the potential effects to human health and the environment for environmental conditions at that time (ICF-Clement, 1988). The EA evaluated the potential risks posed by
contamination existing in 1988 without considering future remedial actions proposed for the Site. The assessment focused primarily on risks from exposure to contaminated groundwater, but also qualitatively evaluated risks to construction workers,
which were included as a worst-case scenario, assuming residential units would be constructed. The EA concluded that there was not a significant risk over most of the MEW area because of the relatively low VOC concentrations in exposed surface soils
under the then-current use conditions. However, the EA did qualitatively note that redevelopment of the Site could lead to 

  
 12 

 
significant exposure to contaminants present in subsurface soils through inhalation of vapors or dust, assuming that no remedial action was taken at the Site. In addition, the EA did not evaluate
inhalation of contaminated indoor air. 

  
 13 

 3.0 DATA EVALUATION AND IDENTIFICATION OF CHEMICALS OF POTENTIAL CONCERN 

This section describes the groundwater, air, and flux data used for the HHRA. The methods for selecting chemicals of potential concern (COPes) that were
evaluated in the HHRA are also discussed. 
 3.1 Areas Defined for Evaluation of Risk 

The 213 acre NRP is being planned for redevelopment as a collaborative research and educational campus, with associated facilities. For planning purposes, NRP
was divided into 19 parcels as part of the Final Programmatic Environmental Impact Statement (DCE, 2002). The location of the parcels is shown in Plate 1 (DCE, 2002). Based on their historical use and the proposed future use, Parcels 1 through 9 and
12 through 19 were selected for evaluation as part of the HHRA. No contamination sources have been identified in Parcels 9, 10, 11, and 16 and they have been eliminated from further consideration. 

Groundwater sampling and/or treatment wells in the upper aquifer (A aquifer) are located in parcels 1, 2, 4, 5, 6, 7, 8, 12, 12a, 13, 15, 17, 18, and 19. No A
aquifer wells are present in parcels 3 and 14. Air samples were taken in and around buildings located in parcels 1, 2, 3, 4, 6, 12, 13, 15, 17, and 18. Only parcel 14 did not have either air sample or groundwater sample data associated with its
location. 
 3.2 Data Evaluation 
 Groundwater monitoring data
collected from the uppermost (Al) aquifer at the Site from February 1996 to July 2000 (i.e., the five most recent sampling years) from Parcels 1 through 8, and 12, 13, 14, 15, 17, 18, and 19 were compiled. Table 1 lists the wells from which data
were evaluated for this Risk Assessment. VOCs were the only chemicals for which the groundwater samples were analyzed for this HHRA. For each chemical, in each well, the following descriptive statistics for groundwater were calculated for each VOC:
number of detections, number of analyses, frequency of detection, minimum and maximum detected values, and arithmetic mean. Per USEPA guidance, for a non-detect sample, half the detection limit was used in the statistical calculations. A statistical
summary for groundwater is detailed in Table 2. Groundwater sample locations are shown in Plate 2. (The full groundwater data set is provided in Appendix e.) Groundwater wells were not present in parcels 3 and 14. 

Predicted indoor air concentrations for VOCs (USEPA, 2000b), based upon the measured groundwater concentrations were compared to indoor air concentrations
(HIA, 2000b; Harding ESE, 2001d; SAIC, 1999, 2000) measured in numerous buildings and outdoors throughout the NRP (Section 7.3). Table 3 lists those buildings on the NRP site for which air data was available. The building locations are shown in
Plate 3. In some of the indoor air samples, chemicals detected in the groundwater were not present (e.g., vinyl chloride). To confirm this result, surface soil flux was measured. The measured surface soil flux is primarily due to contaminants in the
groundwater on the Site, but some contribution may also be from VOCs in soil. 

  
 14 

 Indoor and outdoor air quality measurements have been conducted at several locations at NRP (SAIC 1999, 2000;
HLA, 2000b; Harding ESE, 200ld). These data were used to calculate indoor and outdoor risk. Descriptive statistics for the air data, for each chemical, in each building, are provided in Table 4. (The fu11 air data set is provided in Appendix D.)

 C.E. Schmidt, Ph.D., Environmental Consultant, Red Bluff, California, performed flux measurements at 22 locations (Appendix A) on March 20 and
April 24, 2001, under subcontract to Harding ESE, now MACTEC Engineering and Consulting. Dry-season measurements were made on August 8, 2001, at the same 22 locations, plus 1 new additional location; total 23 flux sample locations. Flux
measurements were performed following the USEPA flux chamber protocol (USEPA, 1986b) and all surface flux samples were shipped offsite for chemical analyses using USEPA Test Method T0-14/gas chromatography mass spectroscopy (GC/MS) for selected VOCs
(Section 3.2), operated in the selective ion mode (SIM). A technical memorandum, which includes descriptions of the flux chamber methodology, locations of samples, and a discussion of the results, is included as Appendix A. 

3.3 COPC Selection 
 According to USEPA guidance (1989a), a risk
assessment should focus on the chemicals that pose the greatest risk to human health. USEPA provides selection criteria for excluding from the assessment those chemicals that are nonhazardous or not site-related. Because the groundwater is not used
for drinking, (i.e. drinking water PRG does not apply to vapor intrusion of VOCs from groundwater) there were no readily available toxicity criteria against which to screen groundwater contaminants. 

For all chemicals detected in groundwater, NRP air and flux samples were used to verify the presence of VOCs in the air. If a chemical was detected in the
groundwater, but there were no detections in any air or flux samples, then those chemicals were not carried through the air exposure route to the risk assessment. However, some chemicals, which were detected in the groundwater, but not detected in
air, were not analyzed for in the surface flux samples. Erring on the conservative side, these chemicals were kept as COPCs when estimating risk based upon the groundwater volatilization modeling. Similarly, if a chemical is detected in air samples,
but was not present in any of the groundwater samples, it was not carried through to the risk assessment because it was assumed to be due to background air, not to site groundwater contamination. Table 5 lists all the chemicals that were selected as
COPCs. 
 Onsite indoor and outdoor air samples were analyzed for a full suite of volatile organic compounds. Only benzene, TCE, PCE, and 1,4-dioxane were
consistently detected in air across the Site. 
 The following chemicals were evaluated during the soil flux sampling: 

 

											
	•	  	Vinyl Chloride	  	•	  	cis-1,2-Dichloroethene	  	•	  	1,4-Dioxane
	•	  	1,1-Dichloroethene	  	•	  	Chloroform	  	•	  	Trichloroethene (TCE)
	•	  	Methylene chloride	  	•	  	1,1,1-Trichloroethane	  	•	  	Tetrachloroethene (PCE)
	•	  	trans-1,2-Dichloroethene	  	•	  	1,2-Dichloroethane	  		  	
	•	  	1,1-Dichloroethane	  	•	  	Benzene	  		  	

  
 15 

 3.4 Background Evaluation of Air Concentration 

Measurement of indoor and outdoor air on the NRP Site may detect chemicals present because of volatilization through the soil from the groundwater plume, but
they may also represent a background of chemicals nonnaHy present in the urban atmosphere. Data from the Bay Area Air Quality Management District (BAAQMD), Mountain View monitoring station (BAAQMD, 2000) were evaluated. Based on geographical
considerations, the 1999 BAAQMD Mountain View data were used for comparison to air measurements on the NRP site. (Note: 2000 BAAQMD data was not available for the Mountain View monitoring station.) The principal contaminants in the BAAQMD data are
benzene, TCE, and PCE. A statistical summary of this data is provided in Table 6. A background correction could only be applied to the contaminants listed in Table 6. In as much as other contaminants were detected in the NRP samples, but were not on
the BAAQMD analyte list, a background correction of the NRP air sample data could not be made. 
 Concentrations of benzene, due to emissions from burning
of fossil fuel (e.g., automobile exhaust), are significantly higher than any of the other organic chemicals routinely measured by BAAQMD. In the evaluation of risk based upon air measurements, the BAAQMD data were used to correct the onsite air
measurements for background benzene that would normally be present in the air, above any contribution from benzene in the groundwater. 

  
 16 

 4.0 EXPOSURE ASSESSMENT 

An exposure assessment evaluates how much of a specific substance a receptor may ingest, inhale, or absorb through the skin over a specified time period. This
section describes the potential receptors and exposure pathways selected for quantitative risk characterization. Exposure assumptions (or factors), equations used to estimate doses for the selected receptors, and methods used to derive exposure
point concentrations (EPCs) are also described. The methodology for exposure point concentrations utilized in this risk assessment applies to both current and future land use. For purposes of this risk assessment, both current and future land use
are described by the exposure parameters chosen in the following sections. 
 4.1 Exposure Setting and Land Use 

Moffett Field was operated as a NAS by the U.S. Military beginning on its date of commission in April 1933. The base was designated for closure as an active
military base under the U.S. Department of Defense Base Realignment and Closure (BRAC) program. Currently, the building and facilities are used as described below (HLA, 2000a; Harding ESE, 2001b,c): 

 

	•	 	Buildings are used by NASA and other federal agencies for administration, research support, storage, base support services, retail, motor pool operations, or are vacant. 

 

	•	 	Dormitories and administrative buildings associated with the Space Camp Operations are present in the western portion of the site; however, because of their location relative to the contamination, they are not included
further in this HHRA. 

  

	•	 	Hangar 1 is used for special events, and houses a museum of the former NAS Moffett Field. The buildings immediately adjacent to Hangar 1 are vacant. 

 

	•	 	In the areas adjacent to the airfield, buildings are used for office operations, air traffic control, or are vacant. A large portion of these areas (Parcel 19) have been identified as a habitat area for burrowing owls,
a California species of special concern, and will not be developed. 

 4.2 Identification of Receptors and Pathways 

Pathways of exposure are the means through which an individual may contact a chemical. Determinants of complete exposure pathways include
environmental/geographic considerations, locations and activity patterns of the potentially exposed populations, and the potential for a chemical to migrate within a particular medium (e.g., air transport) or from one medium to another (e.g.,
release of particulates from soil to air). Each of the fo11owing components must be present for an exposure pathway to be complete (USEPA, 1989a): 
  

	•	 	A potential source of a toxic substance must be present in an environmental medium, such as groundwater. 

  

	•	 	A potential receptor must be present, such as a resident living near or on the potential source. 

  
 17 

	•	 	A contact point must also be present, such as a construction worker touching groundwater contaminated with some substance. 

  

	•	 	There must also be a route for the substance to enter the body, such as the inhalation of vapors by a child playing outside. 

The potential receptors, exposure routes, and pathways considered in this HHRA are described in the sections below. A conceptual site model (CSM) illustrating
these exposure routes and pathways are discussed and presented in Figure 1. 
 4.3 Potential Receptors 

Potential receptors are members of a population who may be exposed to contaminated media during the course of daily living and working in the areas of concern.
The receptors to be evaluated in the HHRA were identified based on the current and future land uses, which are research and development, education, office, and may inc1ude dormitory style housing and childcare facilities. On the basis of discussions
with NASA, contractor personnel and regulators, (Harding, 2002), four receptors were evaluated for this HHRA: 
 1. Construction worker - This receptor
represents construction workers and laborers who could have direct contact with groundwater. 
 2. Indoor worker - This receptor is representative of all
persons who would spend the majority of their working day on site indoors. This would include researchers, lecturers, office personnel students, as well as maintenance workers whose primary duties involve indoor activities (e.g. electricians and
plumbers). 
 3. Adult and child residents - some dormitory style housing is planned for the site. It is assumed that residents would primarily be comprised
of students living on site, as well as their spouses and children. 
 4. EPA default 30 year resident - this is comprised of a 6 year chi1d exposure (0 to 6
years of age) and a 24 year adult exposure. 
 It is assumed that all receptors are exposed to chemicals present in the air. Since subsurface building
foundations and below ground utility work would be required, it is assumed that construction workers could be in direct contact with the shallow groundwater aquifer present at the site. 

4.4 Exposure Pathways 
 Receptors could be exposed to the COPCs
by any of the following pathways: 
  

	•	 	Inhalation of volatile chemicals 

  
 18 

	•	 	Dermal absorption due to direct contact with groundwater (construction worker only) 

 Dermal absorption of
COPCs is a result of chemicals being absorbed into the body from any direct skin contact with contaminated groundwater. Contact by construction workers with subsurface groundwater is assumed to involve exposure to greater body surface areas due to
the type of below ground level manual work involved. Chemicals absorbed through the skin are potentially absorbed into the blood stream. 
 VOCs present in
groundwater have the ability to volatilize from the groundwater, and via migration of the soil vapors, into indoor and ambient air. Once in the air, humans can inhale the gas. Once inhaled, the VOCs can potentially be absorbed into the .blood
stream. 
 4.5 Conceptual Site Models 
 A conceptual site model
(CSM) is a representation of the possible combinations of receptors; exposure routes, and exposure pathways possible for a site. Figure I shows the CSM for each receptor considered as part of the HHRA. Dermal exposure due to direct contact with the
shallow groundwater at the site was evaluated for construction workers and the inhalation exposure pathway was evaluated for all receptors. 
 4.6 Exposure
Point Concentrations 
 To provide a range of risk estimates, two types of exposure scenarios were used in this HHRA: a reasonable maximum exposure (RME) and
a central tendency exposure (CTE). A RME, as defined by USEPA (1989a), is the “highest exposure that is reasonably expected to occur” and is estimated using a combination of average and upper-bound values of human exposure parameters. A
CTE provides an estimate for exposure at a site by the use of average or site-related exposure parameters. 
 According to USEPA (1992a), the measure of
exposure appropriate for a risk assessment is the average concentration of a contaminant throughout an exposure unit, or a geographic area to which humans are exposed. This premise is based on the assumption that, over a long enough period of time,
a receptor would contact all parts of the exposure unit. A receptor would not likely be exposed to only the maximum or any other particular detected concentration of a chemical for the full period of exposure. Therefore, for the CTE scenario, the
arithmetic average concentration for each COPC for each well or building was used as the EPC. 
 For each chemical, in each well or building, if the
chemical was detected above the method detection limit (MDL) in at least one sample, it was assumed that the chemical was present. When calculating the EPC, all other non-detect results for that chemical were then set at one-half the MDL (USEPA,
1989a). However, if all of the samples for a given chemical, within a well or building, were non-detects, it was assumed that the chemical was not present, and therefore EPCs were not calculated. 

A conservative estimate of the average concentration of a chemical across an exposure unit is the 95 percent upper confidence limit (95 percent UCL) on the
mean, which was the EPC used for 

  
 19 

 
the RME scenario. Different methods are available to estimate the 95 percent UCL, depending upon the underlying distribution of the data set. In the HHRA, arithmetic, Land, and Chebyshev 95
percent UCLs were calculated for each data set (USEPA, 1997b; Schulz and Griffin, 1999). If the results of the W-test (Shapiro and Wilk, 1965) indicated that the data were normally distributed, then the arithmetic 95 percent UCL was used. If the
W-test suggested that the sample set was log-normally distributed, Land’s method (Land, 1975) was used to determine the 95 percent UCL. If the W-test indicated that the data set was neither normal nor lognormal, Chebyshev’s inequality
(Singh et al., 1997, USEPA, 2002) was used to provide an upper-bound estimate of the 95 percent UCL. 
 EPCs for the RME scenario were selected based upon
the results of the relationship between the most appropriate 95 percent UCL and the maximum sample value. In those cases where the 95 percent UCL exceeded the highest measured sample result, the maximum detected concentration was used as the EPC
(USEPA, 1992a). If the 95 percent UCL did not exceed the maximum detected value, the 95 percent UCL was selected as the EPC. 
 EPCs for groundwater were
calculated (Table 2) to assess risk due to direct exposure to groundwater and to volatiles from groundwater. EPCs were calculated for each well. These results were then used to generate iso-risk contours, which are presented in Plates 4 through 22.
Separate EPCs were calculated for the air measurements in each building (Table 4). These measured air values result from the presence of contaminants in the groundwater and/or soil, as well as other non-site specific contaminant sources (e.g.
background). Therefore, the measured air EPCs used for calculating the indoor and ambient air risk, were corrected using the 1999 BAAQMD background data from the monitoring station located in Mountain View presented in Table 6. 

4.7 Chemical Intake Estimates 
 Intake estimates were calculated
for each COPC and exposure pathway, using air concentrations estimated using the groundwater volatilization model and direct air measurement. Intake, or dose, is defined as the average amount of chemical systematically taken in by the body over a
given period of time. For noncarcinogenic effects, the intake is averaged over the period of time that receptors are exposed to the COPCs and is referred to as the average daily dose (ADD). For carcinogenic effects, the intake is averaged over a
receptor’s lifetime and is referred to as the lifetime average daily dose (LADD). The general equations employed to estimate intakes for each exposure pathway considered in the HHRA are presented in Sections 4.7.1 through 4.7.4. 

Quantification of exposure intake is dependent on chemical EPCs, as well as general exposure assumptions, or parameters. Exposure parameters are single-point
estimates used to develop the intake estimates for each scenario. They are based on information that is highly conservative in nature and are intended to overestimate exposure to be protective of sensitive members of the population, such as children
or the elderly. 
 Both CTE and RME assumptions were used in the exposure assessment and subsequent risk ca1culations. The parameters used to assess
exposure in the HHRA are summarized in the sections below and are provided in Tables 7 through 10. 

  
 20 

 4.7.1 General Exposure Assumptions 

General exposure assumptions are used in the intake calculations for all exposure pathways evaluated in the HHRA. General exposure assumptions include body
weight, exposure duration, exposure frequency, and averaging time. These assumptions are provided in Tables 7 through 10 and detailed below: 
  

	•	 	Body weight (BW): It was assumed that the BW for an adult is 70 kilograms (kg) for the CTE and RME scenarios (USEPA, 1997a). A BW of 15 kg was used for the CTE and RME child (USEPA, 1997a). 

 

	•	 	Exposure duration (ED): For maintenance and indoor workers, a CTE ED of 4 years, corresponding to an average employee tenure (USEPA, 1997a), and an RME ED of 25 years were used (USEPA, 1997a). Construction workers were
considered to be onsite for relatively short periods of time; consequently, a CTE ED of 1 year and an RME ED of 2 years were assumed for this receptor. The EDs for adult and child residents were assumed to be 5 years for the CTE scenario (related to
an average post-doctoral tenure) and 10 years for the RME scenario (corresponding to an extended post - doctoral tenure). A separate default 30 yr residential exposure, consisting of a 6-year child exposure
and a 24-year adult exposure was also evaluated. 

  

	•	 	Exposure frequency (EF): An EF of 250 days per year was used for both the CTE and RME scenarios for outdoor maintenance, construction, indoor worker, and student receptors. This value is based on a 5-day workweek; 50
weeks per year. However, for a construction worker, it was assumed that direct contact with groundwater would only occur 50 days per year for both the CTE and RME scenarios. For the CTE scenario, it was assumed that adult and child residents would
be exposed to chemicals at the Site 300 days per year; for the RME scenario as well as the default 30 year residential scenario, the EF for adult and child residents was assumed to be 350 days per year (USEPA, 199Ia). 

 

	•	 	Averaging time (AT): As explained above in Section 4.7, intake calculations are averaged over periods of time. For noncarcinogenic effects, the AT is equal to the period of time that receptors are exposed to the
COPCs, or 365 days per year multiplied-by the ED; these ATs vary for each receptor. For carcinogenic effects, the AT is equal to a receptor’s lifetime, or 365 days per year multiplied by 70 years. Accordingly, the AT for carcinogenic effects
was 25,550 days. 

 4.7.2 Exposure Parameters and Equations for Dermal Contact with Groundwater 

Exposure assumptions used in the intake calculation for dermal contact with groundwater are shown in Tables 7 through 10 and detailed below: 

 

	•	 	Body surface area (SA): The SA is the total amount of skin surface that can be exposed to contaminated media. The construction worker was assumed to have hands, feet, and lower legs exposed and in contact with
groundwater; therefore, SAs of 4,860 cm2 and 6,140 cm2 were used for the CTE and RME scenarios, respectively, for groundwater exposure (USEPA, 1997a). 

  
 21 

	•	 	Dermal permeability constant (Kp): The Kp is a measure of the rate at which a chemical is absorbed from a medium through the skin. Permeability constants are typially derived from animal experiments. Each Kp is
associated with a specific chemical, absorbed from a specified solvent. For VOCs in water, Kp values were compiled from USEPA (2001e). The Kp values are presented in Table 11. 

 

	•	 	Exposure time (ET): For dermal contact with groundwater, an ET parameter was applied to the intake estimates to account for the amount of time during one day that a construction worker would contact COPCs in
groundwater. For the CTE scenario, an ET of I hour (for 50 days per year) was used. For the RME scenario, an ET of 2 hours (for 50 days per year) was applied. 

Chemical intake via dermal contact with groundwater was estimated according to the following equation: 

 

					
	Intake	  	=	  	Cgw × SA × Kg × ET × EF × ED × VCF
		  		  	                         BW × AT
	
	where:
			
	Intake	  	=	  	Intake, or dose, for each COPC (mg/kg-day)
	Cgw	  	=	  	EPC in groundwater (milligrams/liter [mg/L])
	SA	  	=	  	Body surface area (cm2)
	Kp	  	=	  	Dermal permeability constant (cm/hr)
	ET	  	=	  	Exposure time (hrs/day)
	EF	  	=	  	Exposure frequency (days/year)
	ED	  	=	  	Exposure duration (years)
	VCF	  	=	  	Volume conversion factor (10-3 L/cm3)
	BW	  	=	  	Body weight (kg)
	AT	  	=	  	Averaging time (days).

 4.7.3 Groundwater Volatilization Model 

Evaluation of the inhalation exposure routes requires estimations of indoor and outdoor air concentrations based upon the amount of chemical contamination
present in groundwater. For each groundwater COPC, the Johnson and Ettinger Volatilization model (EPA, 2000b) was used to estimate indoor air concentrations and a volatilization factor (VF), taken from the ASTM methodology (ASTM , 1995), was used to
calculate the fraction of each chemical present in the contaminated media that would evaporate to the air (outdoor). 
 Details of the Johnson and Ettinger
model can be found in the USEPA Users Guide (EPA, 2000b). The EPA Johnson and Ettinger (EPA, 2002) spreadsheet cannot be utilized due to the number of chemicals and number of wells that must be evaluated to generate the risk isopleths. Consequently,
only the Tier 1 Infinite Source equations from Johnson and Ettinger (as implemented by EPA, (EPA, 2000)) were extracted and. used to develop a database model capable of handing the large amount of site groundwater data. The ASTM VF equations for
outdoor air were also incorporated into the database model. 

  
 22 

 Assumptions required for use of the building parameters employed in the volatilization model are detailed in
Table 14. It was assumed, based upon projected ]and use, that the typical structure that will be constructed would be a three story, 90,000 square foot (30,000 square feet per floor) office/research building. Nominal dimensions were 200’ by
150’ by 40’ tall. Planning factors for office buildings typically allocate a total of 250 square feet person (including personal office space as well as common areas such as conference rooms and break rooms). ASHRAE Standard 62-1999
(ASHRAE, 2000) sets a ventilation rate of 20 cubic feet per minute (cfm) per person for office buildings. Multiplying the ASHRAE ventilation rate times the floor space requirements, and converting units, results in a ventilation rate of 3,400,000
cm3/sec. 
 VFs were calculated based on models and recommendations presented by the American Society of Testing and Materials (ASTM) in Standard Guide for
Risk-Based Corrective Action Applied at Petroleum Release Sites (ASTM, 1995). 
  
 

 
 ASTM makes use of a simple, yet conservative, approach to the prediction of outdoor ambient air concentrations by the use
of a “box model.” The box model is a simple mass-balance equation that uses the concept of a theoretically enclosed space or box over the area of interest. The model assumes the emission of compounds into a box, with the removal of the
compounds based on wind speed. Airborne concentrations for the area can there be estimated and used to represent the onsite air concentrations. 

  
 23 

 For both the volatilization model and direct air measurements, the CTE concentrations were based upon the average
modeled or measured value for each contaminant. RME concentrations were based on the calculated EPC for each modeled or measured contaminant air concentration. These calculated or measured air concentrations then formed the basis for the risk
assessment. 
 Both the EPA Johnson and Ettinger and the ASTM model are based on a number of conservative and health-protective assumptions; accordingly,
modeled indoor and outdoor air concentrations could be greater than actual concentrations that could occur at the Site, and risks and hazards estimated using these methods could err on the side of conservatism. However, in many cases at this site,
the risk due to measured air concentrations is higher than the risk estimated from the groundwater volatilization model. 
 Input parameters used in the
model were default values provided by EPA (2002) and ASTM (1995), with the exception of available site-specific parameters. Boring logs from representative monitoring wells were evaluated and available site-specific data were extracted and
entered into the model. Soil and groundwater characteristics data, used in the volatilization model, are provided in Table 12. Chemical and site-specific inputs used in the model are listed in Tables 13 and 14, respectively. 

Intermediate model results (EPA J & E Intercalc Table) and the calculated indoor and outdoor air concentrations are provided in appendix E. 

4.7.3.1 Differences between Draft Addendum and Revised Final HHRA 

In the Draft Addendum HHRA dated December 16, 2003 a value for of 200 cm was used for the depth below grade to the bottom of the enclosed floor space
(Lt). This has been changed to 15 cm, based upon comments received from one of the reviewers. In addition, the calculation of the area of the enclosed space below grade (Ab) and the crack-to-total area ratio (T\) were incorrectly linked to the
floor-wall seam perimeter (Xcrack). Due to use of incorrect building crack data (which was too large), that was not linked to the theoretical building dimensions, the failure to properly link the actual building dimensions to the enclosed space
below grade parameter resulted in an estimate of the total crack length being much greater than that present in the theoretical future building. This resulted in exaggerated estimates of indoor air concentration, and hence risk. This has been
corrected and the values used in calculation of the air concentrations are shown in table 14 and appendix E. These changes were made based upon comments received on the Draft Addendum HHRA dated December 16, 2003 (see appendix F). Overall,
correction of this error results in a lower risk estimate to the indoor worker. 

  
 24 

	4.7.4	Exposure Parameters and Equations for Inhalation of Volatiles from Groundwater 

 This HHRA addresses inhalation
of volatile COPCs migrating from the underlying groundwater and/or soil. Exposure assumptions used in the intake calculations include inhalation rate and exposure time. These factors are shown in Tables 7 trough l0 and detailed below: 

 

	•	 	Inhalation rate (IR): Inhalation rates for adults differ depending upon the receptor. For construction workers, a CTE IR of 1.5 cubic meters per hour (m3/hr; moderate activity level for outdoor work) and a RME IR of 2.5
m3/hr (heavy activity level for outdoor work) were used (USEPA, 1997a). IRs for indoor workers were 1.0 m3/hr (light activity level for indoor work) and 1.6 m3/h (moderate activity level for indoor work) for the CTE and RME exposure scenarios,
respectively (USEPA, 1997a). Based on a 24-hour average, a CTE IR of 0.63 m3/hr (USEPA, 1997a) and a RME IR of 0.83 m3/hr (USEPA 2000a) were used for adult residents. For children 6 to 8 years of age, a CTE IR of 0.34 m3/hr (USEPA, 1997a) and an
RME. IR of 0.42 m3/hr are recommended (USEPA, 2000). These are the highest recommended IRs for a child within the age range of l through 6 years. These values were used as conservative estimates of inhalation for children. 

 

	•	 	Exposure time (ET): An ET parameter was applied to the intake estimates to account’ for the amount of time during one day that a receptor can potentially inhale COPCs. For construction and indoor worker receptors,
ETs were based upon a typical workday of 8 hours for the CTE scenario and an extended workday of 12 hours for the RME scenario (USEPA, 1997a). For the indoor worker it was assumed that 1 hour for the CTE scenario and 2 hours for the RME scenario
would be spent outdoors. For the CTE scenario, an ET of 17.75 hours (16 hours indoors and 1.75 hours outdoors; USEPA, 1997a) was assumed for adult and child residents. The RME ET assumed for child and adult residents was 24 hours (22.25 hours
indoors and 1.75.hours outdoors; USEPA, 1997a), which is very conservative because residents are typically not exposed all day to contaminants at their place of residence (indoors or outdoors). 

Chemical intake via inhalation of volatiles in indoor air was estimated according to the following equation: 

 

							
	Intake	  	=	  	Cin × IR × EF × ET × ED	  	
		  		  	BW × AT	  	

 Chemical intake via inhalation of volatiles in the outdoor air, based upon flux measurements, was estimated according to the
following equation: 
  

							
	 Intake
	  	=	  	Ca × IR × EF × ET × ED	  	
		  		  	BW × AT	  	
				
	where:	  		  		  	
			
	 Intake
	  	=	  	Intake, or dose, for each COPC (mg/kg-day)
	 Cin
	  	=	  	EPC in indoor air (mg/m3 measured or modeled
	 Ca
	  	=	  	EPC in ambient air (mg/m3 measured or modeled
	 IR
	  	=	  	Inhalation rate (m3/hr)
	 EF
	  	=	  	Exposure frequency (days per year)
	 ET
	  	=	  	Exposure time (hours per day)
	 ED
	  	=	  	Exposure duration (years)
	 BW
	  	=	  	Body weight (kg)
	 AT
	  	=	  	Averaging time (days).

  
 25 

 5.0 TOXICITY ASSESSMENT 

This section presents the toxicity assessment for the COPCs evaluated in the HHRA. The toxicity assessment includes identification of the types of potential
toxicity associated with each COPC (i.e., noncancer and carcinogenic effects) and the chemical-specific dose-response relationships. The dose-response characterizes the relationship between the dose of a chemical and the probability of an adverse
health effect in an exposed population. 
 5.1 Noncarcinogenic Toxicity Criteria 

Dose-response criteria for assessing the potential for noncancer health effects from exposure to chemicals have been developed by USEPA on the principle
(supported by scientific data) that noncancer health effects occur only after a threshold dose is reached. This threshold dose is usually estimated from the “No Observed Adverse Effect Level” (NOAEL) or the “Lowest Observed Adverse
Effect Level” (LOAEL) determined from chronic (i.e., long-term) animal studies. The NOAEL is defined as the highest dose at which no adverse effects are observed, while the LOAEL is defined as the lowest dose at which adverse effects are
observed. 
 Uncertainty factors, or safety factors, are applied to the NOAEL or LOAEL observed in animal studies or human epidemiological studies to
establish reference doses (RfDs). A chronic RID, as defined by USEPA, is an estimate of continuous (i.e., chronic) exposure to the human population (including sensitive subgroups) that is likely to be without appreciable risk of deleterious effects
during a lifetime (USEPA, 1989a). 
 In most cases, the RfD is calculated using non-toxic exposure levels in animals extrapolated to humans and reduced
further using individual uncertainty factors ranging from 1 to 10. Uncertainty factors are used in an attempt to account for limitations in the quality or quantity of available dose-response data. For example, an uncertainty factor of 10 is applied
to account for variation of the sensitivity of the human population. If the toxic endpoints are based upon animal studies, but applied to humans, an additional factor of 1 to 10 is applied. Ideally, the RfD is based upon the NOAEL. In those cases
where only the LOAEL is available, another factor of 1 to 10 is applied. Similarly, if only sub-chronic data are available, then an uncertainty factor of 1 to 10 is applied. Finally, RfDs can be adjusted downward using a modifying factor of l to 10
to account for the quality of the toxicological studies or results. Thus, the uncertainty factors and the modifying factors provide an inherently more conservative RfD. If all uncertainty and modifying factors are applied at their maximum value of
10, then the endpoint doses observed in animal studies may be reduced by an overall factor of 10,000 for estimation of human exposures. 
 Rills developed
by USEPA were used to evaluate noncarcinogenic health hazards in the HHRA. The current Rills were compiled from USEPA’s Integrated Risk Information System (IRIS; VSEPA, 200Ja). If values for a particular chemical were not in IRIS, the Health
Effects Assessment Summary Tables (HEAST; USEPA, 1997c) were consulted, as suggested in USEPA’s risk assessment guidelines (USEPA, 1989a). If RfDs were not available in HEAST, RfDs were compiled from the National Center for Environmental
Assessment (NCEA) as cited in USEPA (2000a). 

  
 26 

 The noncancer toxicity criteria for the COPCs are listed in Table 15 and discussed in Section 5.3 for each
chemical. For purposes of this assessment and consistent with USEPA guidance (USEPA, 1998), oral Rills were used to represent dermal Rills (USEPA, 1989a). Where inhalation toxicity criteria were not available, oral toxicity criteria were used. 

5.2 Carcinogenic Toxicity Criteria 
 Chemical carcinogens are
generally divided into two classes, based upon the mechanism by which they cause cancer. These two classes are genotoxic agents (capable of causing DNA damage) and non- genotoxic (toxic through mechanisms not
related to DNA damage). For genotoxic carcinogens, it is generally assumed that no threshold exists below which the agent cannot cause cancer. In other words, no matter how small the dose, there is some carcinogenic response, even if that response
cannot be measured in animal experiments or in an exposed human population. In contrast to this, non-genotoxic carcinogens are likely to have a threshold dose, below which no adverse toxicological impact would be expected to occur. However,
regulatory agencies, such as USEPA, have traditionally treated as chemical carcinogens as if there was no threshold for the carcinogenic effect. This is the most health conservative (i.e., most protective) approach to extrapolation of animal studies
to humans. 
 The dose-response curve used by regulatory agencies is typically derived using the linearized multistage (LMS) model, which extrapolates the
tumor response observe in animals exposed to high doses (commonly reaching the maximum tolerated exposure) of a chemical to a theoretical cancer risk for humans exposed to low doses. The LMS model is considered highly conservative because:
(1) it does not allow for adjustments from metabolism or known DNA repair mechanisms that may prevent tumor formation at low doses, thus providing a threshold for the carcinogenic effect, and (2) it does not account for species differences
that may result in chemical carcinogenicity by a mechanism only relevant to the specific laboratory animal. 
 The LMS model provides policymakers with an
upper-bound risk estimate. Accordingly, USEPA acknowledges that the LMS mode] estimates are likely to greatly overestimate cancer risks (USEPA, 1986a): 

It should be emphasized that the linearized multistage procedure leads to a plausible upper limit to risk that is consistent with some proposed mechanisms of
carcinogenesis. Such an estimate, however, does not necessarily give a realistic prediction of the risk. The true value of the risk is unknown, and may be as low as zero. The range of risks defined by the upper limit given by the chosen model and
the lower limit which may be as low as zero, should be explicitly stated. An established procedure does not yet exist for making “most likely” or “best” estimates of risk within the range of uncertainty defined by the upper and
lower limit estimates. 
 In 1996, USEPA published proposed Guidelines for Carcinogen Risk Assessment (USEPA, 1996). The proposed guidelines are a revision
of USEPA’s 1986 Guidelines for Carcinogen Risk Assessment, and when finalized, will replace the 1986 cancer guidelines. The proposed guidelines are intended to improve upon the 1986 guidelines by incorporating recent scientific advances in the
understanding of carcinogenesis. Whereas the existing guidelines only allow for 

  
 27 

 
a default approach (the LMS model) for extrapolating low-exposure risks to humans from high-exposure studies, the proposed guidelines allow for the application of biologically based models that
incorporate an understanding of a chemical’s mechanism of action. Thus, where scientific studies of a chemical provide strong indication that a threshold is necessary for the initiation or promotion of carcinogenesis, the updated dose-response
assessment can incorporate a threshold dose (VSEPA, 1996). Because the current methodology does not incorporate this mechanism of action (including possible threshold response), toxicity values derived using the 1986 cancer guidelines may result in
greater overestimates of the potential risk of chemicals. 
 Cancer risks for exposure to carcinogens are defined in terms of probabilities. The
probabilities identify the likelihood (based on the assumptions established in the model) of a carcinogenic response in a member of the exposed population who receives a given dose of a particular chemical (based on mathematical modeling of the
dose-response data). The probabilities are expressed in terms of the slope factor (SF). The SF represents the probability of a carcinogenic response (per unit dose). The SF, multiplied by the predicted chemical dose, provides an estimate of the
upper-bound theoretical excess cancer risk over the course of a 70-year lifetime. 
 SFs for this assessment were compiled from Cal/EPA’s Toxicity
Criteria Database (Cal/EPA, 2001) and IRIS (USEPA, 2001a). For each COPC and exposure route, the higher SF from these two sources was used. 
 An important
component of the toxicity assessment is an evaluation of the weight-of-evidence for human toxicity of each chemical. In assessing the carcinogenic potential of a chemical, USEPA’s Human Health Assessment Group (HHAG) classifies the chemical
into one of the following groups, according to the weight-of-evidence from epidemiologic and animal studies (USEPA, 1997c): 
  

	•	 	Group A - Human carcinogen (sufficient evidence of carcinogenicity in humans) 

  

	•	 	Group B - Probable human carcinogen (“B1” indicates limited evidence of carcinogenicity in humans; “B2” indicates sufficient evidence of carcinogenicity in animal, with inadequate or lack of evidence
in humans) 

  

	•	 	Group C - Possible human carcinogen (limited evidence of carcinogenicity in animals and inadequate or lack of human data) 

  

	•	 	Group D - Not classifiable as to human carcinogenicity (inadequate or no evidence) 

  

	•	 	Group E - Evidence of non-carcinogenicity for humans (no evidence of carcinogenicity in adequate studies). 

Generally, quantitative carcinogenic risks are evaluated only for chemicals in Groups A and B and on a case-by-case basis for chemicals in Group C. The SFs,
RfDs, and USEPA classifications for COPCs are presented in Table 15 and discussed in Section 5.3. 

  
 28 

 5.3 Toxicity Criteria for the COPCs 

The following sections summarize the toxicity associated with the detected soil and groundwater contaminants, and COPCs evaluated in this HHRA and the
derivation of cancer SFs and noncancer RfDs for each COPC. This information is summarized in Table 15. 
 Soil Only Contaminants 

 

	•	 	Arsenic 

 Arsenic is a known human carcinogen (Group A) based on increased lung cancer in human populations
exposed via inhalation. In addition, liver, kidney, lung, bladder, and skin cancers have been observed from consumption of drinking water containing large amounts of inorganic arsenic. The oral noncancer toxicity value is based on hyperpigmentation,
keratosis, and vascular complications. An inhalation RID is not available for arsenic. 
  

	•	 	Cadmium 

 Cadmium is a Group Bl, or probable, carcinogen based on human, occupational, and epiderniologic
studies, as well as studies on laboratory rats and mice. An RID associated with food intake was applied to this HHRA based on human studies involving chronic exposures. There is no recommended inhalation RID for cadmium. 

 

	•	 	Chromium (VI) 

 Chromium (VI) is classified as Group A carcinogen via the inhalation route only, based on a
relationship between occupational exposure and lung cancer. Carcinogenicity via the oral route has not been verified and thus, it is a Group D carcinogen by this pathway. The oral RID is based on the NOAEL in experimental animals. The inhalation RID
was derived from occupational exposure via inhalation. 
  

	•	 	Mercury 

 Toxicity data for mercuric chloride were used to evaluate mercury in the HHRA. The RID is based on
oral and subcutaneous administration to laboratory animals. The inhalation RID is based on the oral RID. Due to a lack of evidence in humans and limited data in animals, mercury is classified as a Group C, or possible, carcinogen; no SFs are
recommended for mercury. 
  

	•	 	Thallium 

 Thallium carbonate was used as a surrogate compound for thallium. The oral RID was derived from
observed increases in hormone levels in experimental animals. The oral RID was used for the inhalation pathway. Thallium is a Group D carcinogen due to a lack of carcinogenicity data in humans and animals. 

 

	•	 	Carcinogenic PAHs 

 The carcinogenic PAHs detected in onsite soil were benzo(a) anthracene, B(a)P, benzo(b)
fluoranthene, benzo(k) fluoranthene, and chrysene. These compounds are classified as Group B2, or probable carcinogens. The SFs for these compounds are based on toxicity data for B(a)P (EPA, 1993). In multiple animal studies, B(a)P has been
carcinogenic via several exposure routes. These compounds have not been demonstrated as causing noncancer health effects. 

  
 29 

	•	 	Bis(2-ethylhexyl)phthalate 

 Bis(2-ethylhexyl)phthalate is a probable carcinogen (Group B2). Increased liver
tumors have been observed in laboratory animals exposed to the compound orally. Liver abnormalities were observed in animals exposed to the compound orally resulting in the oral RID value. The inhalation RID was based on the oral value in this
assessment. 
  

	•	 	Naphthalene 

 Naphthalene is classified by USEPA as a possible carcinogen (Class C). However, recent studies by
the National Toxicology Program (NTP) suggest that naphthalene is a carcinogen. The National Institute of Environmental Health Services of the National Institute of Health has indicated that naphthalene is a carcinogen via the inhalation route in
laboratory animals (NTP, 2001). A SF has not yet been developed for naphthalene, however. The oral RID for naphthalene is based on a NOAEL in animal studies. The inhalation RID was derived from animal studies in which nasal effects were observed.

  

	•	 	Pentachlorophenol 

 Pentachlorophenol is a Class B2 carcinogen, based on increases of several tumor types in
laboratory animals and limited evidence in humans. The oral RID is based on liver and kidney effects in laboratory animals. The oral RID was used for the inhalation route in the HHRA. 

 

	•	 	Polychlorinated Biphenyls 

 PCBs are a Class B2; probable human carcinogen. This is based on a 1996 study that
found liver tumors in female rats exposed to Aroclors 1260, 1254, 1242, and 1016, and in male rats exposed to 1260. These mixtures contain overlapping groups of congeners that, together, span the range of congeners most often found in environmental
mixtures. 
 VOCs in Groundwater or Air 
  

	•	 	Benzene 

 Benzene is a known human carcinogen (Group A). This classification is based on epidemiologic studies
that have demonstrated tumor responses by all exposure routes. The RfDs were compiled from NCEA (USEPA, 2000a) for which no supporting data were provided. 
  

	•	 	Carbon Tetrachloride 

 Carbon tetrachloride is classified as a probable human carcinogen (Group B2) based on
hepatocellular carcinomas in mice, rats, and hamsters. The ND was derived from the NOAEL based upon liver lesions in rats. 
  

	•	 	Chlorobenzene 

 Chlorobenzene is not classifiable as to carcinogenicity in humans and hence is a Group D
carcinogen. Based upon pathological changes in the liver, kidneys, gastrointestinal mucosa, and hematopoietic tissues of male and female beagle dogs, an RfD was derived from the NOAEL. 

  
 30 

	•	 	Chloroethane 

 No data on the carcinogenic potential of chloroethane was available. The RfC is based upon fetal
toxicity in mice and is derived from the NOAEL. 
  

	•	 	Chloroform 

 Chloroform is a probable human carcinogen (Group B2) based on increased incidences of several tumor
types in laboratory animals. The oral RfD was derived from the NOAEL; which is based on liver effects in dogs. In the HHRA, the oral RfD was used for the inhalation pathway in the absence of an inhalation RfD. 

 

	•	 	1,2-Dichlorobenzene 

 1,2-Dichlorobenzene is classified as a Group D carcinogen by U.S. EPA. The RfD, derived
from the NOAEL, is based upon liver lesions in mice. 
  

	•	 	1,3-Dichlorobenzene 

 1,3-Dichlorobenzene is classified as a Group D carcinogen by U.S. EPA. The RfD is taken
from NCEA. No supporting toxicological details were provided. 
  

	•	 	1,4-Dichlorobenzene 

 1,4-Dichlorobenzene is classified as a Group B2 carcinogen by Cal/EPA. An RfC, based upon
significant increases in liver weights for male rats, was derived from the NOAEL. 
  

	•	 	1,1-Dichloroethane 

 1,1-DCA is a Group C, or possible, carcinogen. SFs were developed for 1,1-DCA based on an
increased incidence of tumors in laboratory animals exposed to the compound. Oral and inhalation Rills were derived from NOAEL values based on kidney damage in animals. 
  

	•	 	1,2-Dichloroethane 

 1,2-DCA is classified as a Group B2, or probable, carcinogen. Several tumor types were
observed in laboratory animals exposed to the compound by gavage and topical applications. The RfDs for this compound were compiled from NCEA (USEPA, 2000a), which did not provide supporting data for the values. 

 

	•	 	1,1-Dichloroethene 

 1,1-DCE is a Group C, or possible, carcinogen. Tumors were observed in one mouse strain
exposed to the compound via inhalation. An inhalation slope factor is no longer available. 1,1-DCE is mutagenic and is known to alkylate and bind with DNA. The oral RfD is based on an observance of hepatic lesions in laboratory animals. There is no
inhalation RfD for this compound; thus, the oral RfD was used for the inhalation pathway (for more discussion of the toxicity of 1,1-DCE, see Section 7.10.). 
  

	•	 	Cis-1,2-Dichloroethene 

 There are no data linking cis-1,2-DCE and tumor responses. Therefore, the compound is
c1assified as a Group D carcinogen. The oral RfD was derived from observed blood abnormalities in laboratory animals. There is no recommended inhalation RfD; therefore, the oral RfD was used for this pathway in the assessment. 

  
 31 

	•	 	Trans-1,2-Dichloroethene 

 Trans-1,2-DCE does not have a carcinogenic c1assification, pending an evaluation by
USEPA. An oral RID was derived from an animal study in which subjects were exposed orally to the compound. There is no inhalation RfD; therefore, the oral RfD was used in the HHRA for this pathway. 

 

	•	 	1,2-Dichloropropane 

 1,2-Dichloropropane is not classified a carcinogen by USEPA or Cal/EPA. The RfC is based
upon nasal lesions in mice, rats, and rabbits. The RfC was derived from the LOAEL. 
  

	•	 	Cis- and Trans-1,3-Dichloropropene 

 1,3-Dichloropropene (a mixture of cis- and trans- isomers) is classified a
probable human carcinogen based upon observations of tumors in F344 rats (forestomach, adrenal and thyroid tumors, and liver nodules) and B6C3Fl mice (forestomach, urinary bladder, and lung tumors), positive mutagenic activity, and structural
similarity to known oncogens that produce similar types of tumors in rodents. The RfD was derived from the NOAEL and based upon) increased kidney weights in rats. The RfC was based upon observed changes in respiratory and olfactory epithelium in
both mice and rats. The RfC was derived from the NOAEL. 
  

	•	 	1,4-Dioxane 

 1A-Dioxane is classified a probable human carcinogen (Group B2). The classification is based on:
(1) induction of nasal cavity and liver carcinomas in multiple strains of rats, (2) liver carcinomas in mice, (3) gallbladder carcinomas in guinea pigs. Oral and inhalation RfDs are not available for
non-carcinogenic effects. 
  

	•	 	Ethyl benzene 

 Ethyl benzene is currently classified as Group D by USEPA. The RfD is based on histopatholog c
changes in the liver and kidneys of female rats and derived from the NOAEL. 
  

	•	 	Freon 113 (1,1,2-Trichloro-1,2,2-triDuoroethane) 

 No information on the carcinogenicity of Freon 113 was
available. The RfD was derived from the NOAEL, and based upon slight impairment of psychomotor performance in male human volunteers. No supporting toxicological data was available on the derivation of the RfC. 

 

	•	 	Methylene Chloride 

 Methylene chloride is a Group B2, or probable carcinogen. Increased incidences in several
tumor types have been observed in animals exposed to the compound. The oral and inhalation RfDs are based on observed liver toxicity in laboratory studies. 
  

	•	 	1,1,2,2-Tetrachloroethane 

 1,1,2,2-Tetrachloroethane is a group C carcinogen (possible human carcinogen) based
on increased incidence of hepatocellular carcinomas in mice. No supporting toxicological data was available for the RfD. 

  
 32 

	•	 	Tetrachloroethene (PCE) 

 USEPA has not classified the carcinogenic potential of PCE. Cal/EPA (2001) has
developed SFs for PCE based on liver. carcinomas in laboratory animals. An oral RFD for this compound was derived experimentally based on observed liver toxicity in animals. The inhalation RFD was compiled from NCEA (USEPA, 2000a) and no supporting
data were provided. 
  

	•	 	Toluene 

 Toluene is a Group D (not classified) carcinogen. The RFD is based upon histopathologic changes in the
liver and kidneys, as well as increased liver and kidney weights, in rats. This RFD was derived from the NOAEL. 
  

	•	 	1,1,1-Trichloroethane 

 1,1,1-Trichloroethane does not have a carcinogenic classification (Group D). The oral
and inhalation reference doses were compiled from NCEA (USEPA, 2000a) and no supporting data were provided. 
  

	•	 	1,1,2-Trichloroethane 

 1,1,2-Trichloroethane is classified group C; possible human carcinogen. This is based on
hepatocellular carcinomas and pheochromocytoma in one strain of mice forms the basis for this classification. Carcinogenicity was not shown in rats. 1,1,2-Trichloroethane is structurally related to 1,2-dichloroethane, a probable human carcinogen.
The RfD was derived from the NOAEL and based upon adverse liver effects in mice. 
  

	•	 	Trichloroethene (TCE) 

 USEPA recently reviewed the carcinogenic potential of TCE (USEPA, 200Jd). The upper
bound slope factor of0.4 (mg/kg-day) 1 calculated in this document was used for this HHRA. Cal/EPA (2001) has developed SFs for TCE based on liver and lung carcinomas in laboratory animals. The RfDs were compiled from NCEA (USEPA, 2002a) and no
supporting data were provided. Based upon the revised TCE risk assessment (USEPA, 2001d) and the USEPA Region IX PRG tables (USEPA, 2002a), an inhalation reference dose of 0.01 mg/kg-day was used to estimate
non-carcinogenic health effects. Epidemiologic studies have associated TCE exposure with excess risks of kidney cancer, liver cancer, lympho-hematopoietic cancer, cervical cancer, and prostate cancer. Observed
non-catcinogenic effects include neurotoxicity, immunotoxicity, developmental toxicity, liver and kidney toxicity, and endocrine effects (see also Section 7.11). 
  

	•	 	Vinyl Chloride 

 VC is classified as a known human carcinogen (Group A). The c1assification is based on
(1) epidemiologic evidence for inhalation exposure in occupational scenarios, (2) carcinogenicity in laboratory animals, (3) mutagenicity and DNA adduct formation in in-vitro tests, and (4) the rapid absorption of VC following
exposure. The oral and inhalation RfDs are based on observed liver cell changes in laboratory animals. 
  

	•	 	Xylenes 

 Xylene (dimethylbenzene) exists in three isomeric forms; o-Xylene (ortho or 1,2-dimethlybenzene),
m-Xylene (meta or 1,3-dimethylbenzene), and p-Xylene (para or 1,4-dimethylbenzene). Due to their close physical and toxicological properties, all three isomers are 

  
 33 

 
grouped together as one chemical “Xylenes” by USEPA and classified as non-carcinogenic (class D). CNS toxicity and respiratory effects have been observed in rats at relatively high
doses. Xylenes have been observed to be fetotxic and teratogenic at high doses in mice. The inhalation RID was based on the oral RID. 

  
 34 

 6.0 RISK CHARACTERIZATION 

In risk characterization, the information, results, and conclusions from the data evaluation, exposure assessment, and toxicity assessment are integrated.
Numerical risk estimates calculated for each COPC and exposure route and pathway are combined to estimate total theoretical noncancer hazards and, for carcinogens, total lifetime excess cancer risks. The critical uncertainties affecting risk
calculations are also addressed. 
 6.1 Noncarcinogenic Hazard 

Noncarcinogenic effects for each exposure route and pathway, and for each chemical are evaluated by comparing an average dose to a RID for the same time
period, generally one day. The ratio of the average daily dose to RID is called a hazard quotient (HQ), which is calculated as follows: 
  

					
	 HQ
	  	=	  	ADD
		  		  	RfD
			
	Where:	  		  	
			
	 HQ
	  	=	  	Theoretical noncancer hazard quotient for a specific chemical and exposure pathway
			
	 ADD
	  	=	  	Average Daily Dose (mg/kg-day) for chemical and exposure pathway
			
	 RfD
	  	=	  	Reference Dose (mg/kg-day) for chemical and exposure pathway.

 The HQ assumes that there is a dose below which adverse health effects are unlikely (USEPA, 1989a). If the average daily dose
is below the threshold RID (i.e., the ratio is less than 1), it is unlikely that noncarcinogenic effects would occur. The HQ is specific to chemicals and exposure pathway combination. Therefore, to assess the overall potential for noncarcinogenic
effects from a particular exposure scenario, HQs for the relevant individual exposure pathways (e.g., ingestion, dermal contact, and inhalation) and individual chemicals are summed to obtain the hazard index (HI) for the populations evaluated. 

In general, it is USEPA’s position that a theortical HI value at or below indicates that there is unlikely to be an increased health risk, even for
sensitive populations (USEPA, 1989a). At the same time, a HI greater than 1 does not necessarily indicate that adverse effects will occur, because the RID used in the calculation contains a substantial measure of conservatism. As previously
discussed, the RID is conservative because it is typically derived by applying multiple safety factors to a level at which no adverse effects have been observed or to the lowest level at which effects have been observed in the most sensitive animal
species that have been tested. 
 A significant limitation of the HIs is related to the assumption of additivity. Additivity is most properly applied to
compounds that induce the same effect by the same mechanism of action. Summing HIs for a number of compounds that are not expected to induce the same type of 

  
 35 

 
effects or that do not act by the same mechanism is likely to further overestimate the potential for effects. However, for this HHRA, all of the COPCs are assumed to have similar toxicological
endpoints, because they are all solvents with similar mechanisms of action. Thus, summing of HIs is likely appropriate and is not expected to result in significant overestimation of risk. 

6.2 Cancer Risks 
 The theoretical lifetime excess cancer risks
associated with the lifetime average daily doses are calculated as the product of the lifetime average daily dose (LADD) and the SF for each chemical and exposure pathway as shown below: 

 

					
	 Risk
	  	=	  	SF × LADD
			
	Where:	  		  	
			
	 Risk
	  	=	  	Theoretical lifetime excess cancer risk for chemical and exposure pathway
			
	 SF
	  	=	  	Slope Factor for chemical and exposure pathway
			
	 LADD
	  	=	  	Lifetime Average Daily Dose for chemical and exposure pathway.

 The quantitative risk estimate for suspected carcinogens is expressed as the lifetime theoretical excess (or additional) risk
of contracting cancer above the actual incidence of cancer in the U.S. population. The likelihood of actually developing cancer is l-in-2 for a male and 1-in-3 for a female (American Cancer Society, 1999). The risk estimate is chemical- and exposure
pathway-specific. Therefore, the total upper-bound theoretical excess cancer risk is calculated by combining the risks across exposure pathways and chemicals as follows: 

Total lifetime theoretical excess risk = Sum of risks by chemical and pathway. 

USEPA has provided guidance on the role of risk assessment in federal Superfund remedy selection (USEPA, 199lb). USEPA considers a target lifetime theoretical
excess risk range of lx l0-6 to 1x104 (between one-in-one-million and one-in-ten thousand) to be “safe and protective of public health.” 

According to USEPA, where the total lifetime theoretical excess cancer risk to an individual (based on an RME scenario for both current and future land use)
is Jess than 1x104 and the theoretical noncarcinogenic HI is less than 1, remedial action is generally not warranted unless there are other adverse environmental impacts or an applicable or relevant and appropriate requirement (ARAR) is exceeded.
Even risks slightly greater than l x 10-4 may be considered to be acceptable (i.e., protective) if justified based on site-specific conditions, including uncertainties about the nature and extent of
contaminants and associated risks. Alternatively, on a case-by-case basis, action may be recommended for sites within the 1x 10-4 to lx 10-6 risk range. Where remedial action is warranted, guidance for remedy selection is provided in the USEPA
directive entitled Land Use in the CERCI.A Remedy Selection Process (USEPA, 1995). The directive notes that it is not USEPA’s intent that acceptable risk standards be based solely on categories of land use (e.g., with residential cleanups at a
lx l0-6 level or industrial cleanups at a 

  
 36 

 
lx l0-4 1evel). The Regional Water Quality Control Board, San Francisco Bay Region has accepted 1 x l0-5 cleanup ‘levels on a site-specific basis. Therefore, the risk range provides the risk
manager with the necessary flexibility to address technical and cost limitations, and the performance and risk uncertainties inherent in all site remediation efforts. 

6.3 Risk Characterization Results 
 In this section, the
quantitative evaluations of theoretical noncancer hazards and lifetime theoretical excess cancer risks are presented for each app1icable receptor for air concentrations estimated using the ground water volatilization mode] and direct air
measurements evaluated. Quantitative risks and hazards were estimated under RME and CTE conditions for the data sets described in Section 3.0 (i.e., using groundwater and air). These estimates are summarized in Tables 16 through 25, and Plates
4 through 22. Quantitative risks were compared to the USEPA risk management range of Ix 10-6 to 1x 10-4. Lifetime excess carcinogenic risks within the risk management range may be managed through construction techniques (indoor air) to reduce risks
to an acceptable level and the use of appropriate personal protective equipment (PPE, construction). For the NRP, the acceptable lifetime excess cancer risk level is lx l0-6. Where risk management techniques are not available to achieve acceptable
risk, NASA will implement land use controls. Noncancer hazards were compared to a HI of 1. As discussed in Section 1.0, analytical data for residual soil contamination were not available. Therefore, applicable clean-up target contamination
levels (TCLs) for soil were compiled and are discussed in Section 6.4. 
 As discussed previously, EPCs for individual contaminants were calculated for
each well (groundwater) and each building (air). Within each well or building, risks and hazards were calculated based upon the EPC of the COPCs in groundwater and measured air values using the appropriate models. Tables 16 through 25 contain the
detailed risks and HIs for individual chemicals for each well or building. 
 When calculating risks and HIs, special consideration must be given to vinyl
chloride (VC), benzene, and 1,4-dioxane. Although VC was detected in some of the groundwater samples, it was not detected in any of the flux or air samples. When calculating risk using groundwater data, the groundwater volatilization model used to
estimate air concentrations would tend to overestimate risks because of the presence of VC. In particular, the GW-to-Indoor air model predicted indoor concentrations for VC at levels above the average indoor air measurement detection levels. Since
the air measurement technique employed should have detected VC if present at the predicted model levels, it appears that the model, as used, over predicts indoor air VC concentrations. The calculated risk, at the average detection limit of the
indoor air sampling, corresponds to a risk less than lx l0-6. Therefore, where VC was present in the groundwater, risks were estimated by subtracting out the VC risk. These VC corrected risks and HIs formed the basis for the data used to generate
the iso-risk and HI contours in Plates 4 through 22. 
 Contaminant levels measured in air may include multiple sources for any given chemical. In
particular, benzene risks based upon the air data can be greater than that expected from the groundwater data. Benzene is ubiquitous in the urban atmosphere, primarily due to vehicle exhausts. For many of the estimated risks and HIs that were based
on air measurements, benzene was the single largest contributor to the total risk, even where it was not detected in the 

  
 37 

 
underlying groundwater plume. Therefore, it was concluded that the presence of benzene in the air data could be, for certain buildings, primarily a result of background concentrations, and not
because of significant soil vapor migration from the groundwater plume. Consequently, concentrations due to the presence of background benzene in the air data were subtracted from the measured benzene concentrations. In addition to benzene,
background corrections (Table 6) were also applied for toluene, methylene chloride, 1,1,1 -trichloroethane, tetrachloroethene (PCE), and trichloroethene (TCE). As discussed previously, 1999 data for the BAAQMD Mountain View monitoring station was
used to make this adjustment. Improvements in automobile emissions controls and the use of reformulated gasoline since 1999 should result in decreased background ambient air concentrations for some of these chemicals (e.g. benzene). However, only
BAAQMD data for 1998 and 1999 were available for the Mountain View location. For benzene, toluene, methylene chloride, and trichloroethene the 1998 mean values were greater then the 1999 mean values; a trend towards improving air quality. However,
for perchloroethlyene and trichloroethylene the 1999 mean values were greater than the 1998 mean values. Indoor air measurements were taken in 1999 and 2000, therefore these background concentnltions are likely representative of the actual
background concentrations in the air during the site sampling. 
 The third chemical requiring additional consideration, 1,4-dioxane, was detected in many
flux and air samples, but was not part of the suite of chemicals historically analyzed in the groundwater. Recent sampling has detected 1,4-dioxane only at low levels and only in some of the samples from the Al aquifer underlying the site. The
presence of 1,4-dioxane in the indoor air could result from off gassing of building materials, from other solvent-containing products used in the buildings, or be present as a background contaminant in urban air. However, although risks calculated
from air data may be overestimated under these circumstances (i.e., airborne 1,4-dioxane concentrations are higher than would be expected from the groundwater data), no correction is incorporated because background air data from the BAAQMD were not
available for 1,4-dioxane. 
 The overall carcinogenic risks and noncancer HIs for the NRP are summarized in Section 6.3.1 for each receptor.
Section 6.3.2 presents the calculations of risks and HIs from the groundwater volatilization model. Section 6.3.3 presents the risks and HIs estimated using the measured air concentration data. 

6.3.1 Risk Characterization Summary 
 In general, the highest
estimated lifetime excess cancer risks were located primarily in parcels 1, parts of 2 and 5, 7, 13, 14, 15, 17, and 18 (see Plates 4 through 22). The estimated lifetime excess cancer risks and HIs for all receptors were highest in Parcel.15 or the
space east of 15 (wells W9-l8, W9-35, WIC-11, and WIC-12, see Tables 16 through 20). For construction workers and adult residents (10 year RME, 5 year CTE), RME and CTE risks estimated from the groundwater volatilization model were within the risk
management range. For the indoor worker, child resident (10 year RME, 5 year CTE), and default 30-year residential receptor, the lifetime excess cancer risks estimated from the groundwater volatilization model were above the risk management range
for at least one wen in Parcel 15 (W9-18, W9-35, WIC-11, or WIC-12). Estimated lifetime excess cancer risk based on the measured air concentrations were above the 

  
 38 

 
risk management range for buildings within or adjacent to Parcel 15, for all receptors except the construction worker. In addition, lifetime excess cancer risks estimated from groundwater
volatilization modeling for the eastern portions of Parcels 12 and 12a, the northern portion of Parcel 5, and parts of Parcels 1, 2, and 7 were within the risk management range for all receptors. 

For some of the buildings (e.g. 21, 22, 476, 148, and 156) on the western boundary of the plume, the estimated lifetime excess cancer risks, based upon the
measured air data for some exposure scenarios, were many orders of magnitude greater than that which would have been predicted using the groundwater volatilization model and measured groundwater concentrations for wells in the vicinity of the
building. This discrepancy may be due to: 1) contaminants present in the background air but which could not be corrected for due to a lack of BAAQMD background data; 2) differences between actual building parameters (such as ventilation rate or
building floor wall perimeter crack length and modeled building parameters); 3) contaminant sources other than groundwater which have not been identified nor for which data were available to correct the air measurement data; 4) inaccuracy in the
groundwater volatilization model. 
 The results of the HHRA for each receptor are summarized as follows: 

 

	•	 	Maximum RME lifetime excess cancer risk for construction workers was within the USEPA risk management range (lx l0-6 to lx l0-4) based upon the groundwater volatilization modeling and direct air measurement results. The
maximum estimated RME and CTE HIs for the construction worker, based upon the groundwater volatilization modeling and direct air measurements were greater than 1. This is primarily due to direct exposure to the contaminated groundwater.

  

	•	 	RME lifetime excess cancer risks for indoor workers, estimated from the groundwater volatilization model, were within or below the risk management range, except for one well in parcel 15 (W9-35). RME lifetime excess
cancer risk estimated from the air measurements was above the risk management range (2.3E-4) for four buildings (Building 156, 566, 6 and Hangar 1), but within the risk management range for the remaining buildings. However, lifetime estimated excess
cancer risks estimated from wells near Buildings 6, 156 and 566 were all in the lower end of the risk management range. This high estimated lifetime excess cancer risk for Buildings 156 and 566 may due to sources other than contaminated groundwater
(note that Building 156 is very close to highway 101) or there may be high contaminant levels in the soil or groundwater close to the building, but which are not detected in the current monitoring wells. If the results for Building 156 are
considered anomalous, then Hangar 1 has the highest estimated lifetime excess cancer risk. This building is adjacent to Well W9-35, which has the highest estimated lifetime excess cancer risk based upon the groundwater volatilization modeling. This
suggests that the results for Hangar 1 are associated with contaminants in the groundwater. Maximum RME HIs for indoor workers estimated from both the groundwater volatilization model and direct air measurements were less than or equal to I and the
CTE HIs were less than 1. 

  

	•	 	 Maximum RME and CTE lifetime excess cancer risks for adult residents (10 year and 5 year exposure duration,
respectively), estimated from the groundwater volatilization model, were within or below the risk management range. RME lifetime excess cancer risks estimated from the air measurements were above the risk management range for Building 156, 6, and
Hangar 1 

  
 39 

	 	 
but within the risk management range for the remaining buildings. The high estimated lifetime excess cancer risk for Building 156 may due to sources other than contaminated groundwater, because
the risks estimated from wells in the vicinity of this building were all below or at the low end of the risk management range. If the results for Building 156 are considered anomalous, then Hangar 1 has the highest estimated lifetime excess cancer
risk. CTE lifetime excess cancer risks estimated from the air measurements were below the risk management range for Building 111, and within the risk management range for the remaining buildings. Maximum RME HIs for adult residents (10 year exposure
duration) estimated from the groundwater volatilization model were less than 1. Maximum RME HIs based upon direct air measurements were greater than 1 (Building 6), but the CTE (5 year exposure duration) HIs for all buildings were less than 1.

  

	•	 	RME lifetime excess cancer risks for child residents (I 0 year exposure duration), estimated from the groundwater volatilization model, were within or below the risk management range except for two wells (W9-35 and
W9-2) in parcels 15 and 13. CTE lifetime excess cancer risks for child residents (5 year exposure duration), estimated from the groundwater volatilization model, were within or below the risk management range for all parcels. RME lifetime excess
cancer risk estimated from the air measurements was above the risk management range for Buildings 148, 2, 21, 566, 156, 6, and Hangar 1. As discussed previously, the results for Buildings 566, 21 and 156 may be due to sources other than groundwater
contamination. However, the results for the remaining buildings appear to be associated with groundwater contaminants, based upon comparison to lifetime excess cancer risk estimated from wells near these buildings using the groundwater
volatilization model. Maximum RME lifetime excess cancer risk estimated from contaminant concentrations in wells near Buildings 566, 21 and 156 were between one to two orders of magnitude lower than risks estimated from the indoor air measurements.
Maximum RME (10 year exposure duration) and CTE (5 year exposure duration) HIs for child residents estimated from the groundwater volatilization model were less than 1.Maximum RME (10 year exposure duration) HIs for child residents estimated from
direct air measurements were greater than 1 for Building 6, but less than or equal to 1 for the remaining buildings. Maximum CTE (5 year exposure duration) child resident HIs were less than or equal to 1 for all buildings. 

 

	•	 	Maximum RME lifetime excess cancer risk for 30-year residents, estimated from the groundwater volatilization model, was above the risk management range. RME lifetime excess cancer risk estimated from the air
measurements was also above the risk management range for Buildings 148, 156, 2, 21, 476, 566, 6, and Hangar 1. As discussed previously, the results for Buildings 566, 156, 21 and 476 may be due to sources other than groundwater contamination. The
maximum excess lifetime cancer risks estimated from contaminant concentrations in wells in the vicinity of these buildings were all lower by at least one order of magnitude. However, the results for the other buildings do appear to be associated
with groundwater contaminants, based upon comparison to lifetime excess cancer risk estimated from wells near these buildings using the groundwater volatilization model. Maximum adult and child His, estimated from both the groundwater volatilization
model and direct air measurements, were greater than 1. 

  
 40 

 6.3.1.1 Differences between Draft Addendum and Revised HHRA 

As discussed in section 4.7.3.1, the groundwater to air volatilization model was revised based upon comments received on the Draft Addendum HHRA dated
December 16, 2003. Overall, these changes result in lower risk estimates for most wells. 
 6.3.2 Risk Estimated from Groundwater Volatilization Model

 The individual estimated lifetime excess carcinogenic risks and HIs for each well and receptor are presented in Tables 16 through 20 and Plates 4, 5, 8,
9, 12, 13, l6, l7, and 20. As shown in the tables, risks and HIs were calculated with vinyl chloride (VC) present, as wen as VC subtracted from the total risk and HI. As discussed in Section 6.3, VC was detected in the groundwater but not in
the air or soil flux samples. Therefore, although the presence or absence of VC in the various media is noted for each of the wells, the most applicable total risk estimates do not take into account the presence of VC in the groundwater. All of the
iso-risk plots presented in the plates are exclusive of VC. The risks discussed below for each receptor are exclusive of VC. Other chemicals, such as carbon tetrachloride, were not detected in air, but were also not on the flux analytes list. As
discussed in section 3.3, under these circumstances, in order to err on the conservative side, these chemicals were kept as COPCs. 
 Since the groundwater
volatilization model is based upon contaminant groundwater concentrations, no correction for contaminant concentrations in background air is required. Consequently, Benzene and the other contaminants measured by BAAQMD iri the background air were
included in the risks that were estimated using the groundwater data without correction. 
 Construction Workers 

Table 16 and Plates 4, 5, 6, and 7. 
 Lifetime excess RME and CTE
cancer risk for all of the parcels were within or below the risk management range. The space east of Parcel 15 (well W9-35) had the highest (3.lx I0-5 maximum lifetime excess cancer risk. RME lifetime excess cancer risks were within the risk
management range for Parcels l , 2, 3, 4, 5, 6, 7,12, 12a, 13, 14, 15 and the space east of 15, 17, and 18. CTE lifetime excess cancer risks were within the risk management range for Parcels 5, 13, 15 and the space east of I5, and 17. RME HIs were
above l for parcels 2, 5, 13, 14 15 and the open space east of 15, and 17. CTE HIs were above l for Parcels 13, 15 and the open space east of 15. 
 Indoor
Workers 
 Table 17 and Plates 8, 9, l 0, and 11. 
 Lifetime
excess RME and CTE cancer risk for all of the parcels were within or below the risk management range. The space east of Parcel 15 (well W9-35) had the highest (l.3x 10-4) maximum lifetime excess cancer risk. This was the only well above the risk
management range, however the results for this one well does not significantly impact the risk estimate (within the risk management range) for the entire parcel. RME lifetime excess cancer risks were within the risk management range for Parcels 1,
2, 4, 5, 7, the eastern portions of 12 and 12A, 13, 14, 15 

  
 41 

 
and the space east of 15, 17, and 18. Parcels 13, 15 and the space east of 15, and 17 had CTE lifetime excess cancer risks within the risk management range. The remaining parcels all had CTE
lifetime excess cancer risks below the risk management range. All parcels had an RME and CTE HIs less than 1. 
 Adult (10-year RME, 5-year CTE) 

Table 18 and Plates 12, 13, 14, and 15. 
 Lifetime excess RME and
CTE cancer risk for all of the parcels were within or below the risk management range. The space east of Parcel 15 (well W9-35) had the highest (8.3x 10-5) maximum lifetime excess cancer risk. RME lifetime excess cancer risks were within the risk
management range for Parcels 1, 2, 4, 5, 7, the NE comer of 12A, 13, 14, 15 and the space east of 15, 17, and 18. CTE lifetime excess cancer risks for Parcels l, 2, 3, 5, 13, 14, 15 and the space east of 15, 17, and 18 were within the risk
management range. RME and CTE HIs for all parcels were less than 1. 
 Child (10-year RME, 5-year CTE) 

Table 19 and Plates 16, 17, 18, and 19. 
 Lifetime excess RME
cancer risk for Parcels 13 and 15 and the space east of Parcel 15 was above the risk management range. The space east of Parcel 15 lifetime excess cancer risk (2xl0-4 well W9-35). RME lifetime excess cancer risks were within the risk management
range for Parcels 1, 2, 3, 4, 5, 6, 7, 12A, the eastern edge of 12, 14, 17, and 18. CTE lifetime excess cancer risks for Parcels 1, 2, 3, 4, 5, 7, the eastern edge of 12 and 12A, 13, 14, 15 and the space east of 15, 17, and 18 were within the risk
management range. RME and CTE HIs were less than I for all parcels. 
 Default 30-year Resident 

Table 20 and Plates 20; 21, and 22. 
 The estimated maximum
lifetime excess cancer risk for the default 30-year residential receptor for Parcels 13, 14, 15 and the space east of Parcel 15, and NE comer of 17 were above the risk management range. Well W9-35, in Parcel 15, had the highest estimated lifetime
excess cancer risk (3.2x 10-4). RME lifetime excess cancer risks were within the risk management range for all other parcels. For Parcels 12 and l2A, only the very eastern portions were within the risk management range. The remainders of these two
parcels were below the risk management range. Both adult and child RME HIs (10 year exposure) were less than 1 for all parcels. 
  

	6.3.3	Risk Estimated from Air Measurements 

 Because benzene is present in ambient air, background benzene
concentration, based upon the BAAQMD monitoring station in Mountain View was subtracted from the total measured benzene concentration (Table 6). In addition to benzene, background corrections (Table 6) were also applied for toluene, methylene
chloride, 1,1,1-trichloroethane, tetrachloroethene (PCE), and trichloroethene (TCE). Since VC was not detected in any air sample, the risks presented for each building do not include a contribution from VC. Risks associated with these background
concentrations, for each receptor, are provided in Table 26. 

  
 42 

 For the construction worker receptor risks were the result of exposure to groundwater (dermal) as well as air.
Risks for all other receptors are based only on the direct air measurements. In order to account for the construction worker dermal exposure, the groundwater concentrations are based upon the maximum for each chemical for groupings of wells in
closest proximity (within approximately 500’ radius) to the building in question. (For GW vapor transport into buildings, each well was considered individually.) For the CTE exposure scenario, the maximum of the average of any chemical/well was
used. For the RME exposure scenario, the maximum EPC for any well/chemical was used. 
 Construction Workers 

Table 21 and Plates 4, 5, 6, and 7. 
 Lifetime excess RME and CTE
cancer risk for all of the buildings were within the risk management range except Building 111, which was below the risk management range. CTE lifetime excess cancer risks were within the risk management range for Buildings 148, 15, 2, 476, 555,
566, 583C, 6, and Hangar 1. RME HIs were equal to or greater than 1 for Buildings 148, 15, 2, 476, 555, 566, 583C, 6, and Hangar 1. Hangar 1 had the highest RME HI (9). CTE HIs were greater than l for Buildings 15, 6, and Hangar 1. For most
receptors, the Building 6 HI is greater than that calculated for Hangar 1. For the construction worker, the Hangar l HI is equal to the HI for Building 6 due to the assumption of direct dermal exposure to groundwater. As explained above, groups of
groundwater wells in closest proximity to the building were used to evaluate the dermal exposure. Different wens were considered for Building 6 and Hangar 1 based upon the 500’ radius from each well. The result is that for many chemicals, the
groundwater concentration used to evaluate the dermal exposure was the same for these two buildings. However, for one well associated with Hangar 1, WU4-l0, 1,4-dioxane was detected. None of the wells associated with Building 6 had 1,4-dioxane. Due
to the 1,4-dioxane RID, the HI for the Hangar l construction worker equals the HI for the Building 6 construction worker. 
 Indoor Workers 

Table 22 and Plates 8, 9, 10, and 11. 
 Lifetime excess RME
cancer risks for all of the buildings were within the risk management range, except Buildings 156 (2.3x l0-4), 566 (1.1x10-4), 6 (l.5x 10-4 and Hangar l (1.7x 10-4) which were above the risk management range. However, Plate 8 reveals that Building
566 and 156 are located on the very edge of the known groundwater plume. Lifetime excess cancer risks estimated from the groundwater volatilization model for wells near this building were all significantly lower by about two orders of magnitude. In
addition, Building 156 is located relatively dose to State Highway 101. These factors seem to indicate that the measured concentrations for this building might be due to sources other than contaminated groundwater. All of the buildings had CTE
lifetime excess Cancer risks within or below the risk management range. RME and CTE HIs for all buildings were Jess than or equal to l. 

  
 43 

 Adult (10-year RME, 5-year CTE) 

Table 23 and Plates 12, 13, 14, and 15. 
 Lifetime excess RME
cancer risks for Buildings 156, 6, and Hangar 1 were above the risk management range, however all of the remaining buildings were within the risk management range. Wells closest to Building 156 had estimated lifetime excess cancer risks based upon
contaminant concentrations in the groundwater at least two orders of magnitude lower than the risk estimated for Building 156 from the measured indoor air concentrations. As discussed previously, the indoor air concentration of contaminants in
Building 156 may be due to sources other than the underlying groundwater. All of the buildings had CTE lifetime excess cancer risks within the risk management range, except Building 111, which was below the risk management range. Only Building 6 had
an RME HI greater than 1. CTE HIs for all buildings were less than 1. 
 Child (10-year RME, 5-year CTE) 

Table 24 and Plates 16, 17, 18, and 19. 
 Lifetime excess RME
cancer risks for Buildings 148, 156, 2, 21, 566, 6, and Hangar l were above the risk management range. Lifetime excess RME cancer risks for the remaining buildings were all within the risk management range. As previously discussed, the results for
Building 21, 566, and 156 may be due to sources other than contaminated groundwater. Lifetime excess cancer risk based upon contaminant concentrations in wells closest to these buildings were all at least one order of magnitude lower than the
estimate based upon the measured indoor air concentrations. All of the buildings had CTE lifetime excess cancer risks within the risk management range. Only Building 6 and Hanger l had RME HIs greater than or equal to 1. CTE HIs for all buildings
were less than or equal to 1. 
 Default 30-year Resident 

Table 25 and Plates 20, 21, and 22. 
 The estimated maximum
lifetime excess cancer risk for the default 30-year residential receptor for Buildings 148, 156, 2, 21, 576, 566, 6, and Hangar 1 were all above the risk management range. RME lifetime excess cancer risks were within the risk management range for
all the other buildings. As per the previous discussion, the results for Buildings 21, 156, 476, and 566 may be due to sources other than contaminated groundwater, based upon risk estimates for wells near these buildings. Only Building 6 had an
Adult or Child HI greater than I. 
 6.4 Soil Target Cleanup Levels 

Soil TCLs were obtained from the U.S. EPA Region IX PRGs (USEPA, 2000a); Cal/EPA RBSLs, and the MEW ROD (USEPA, 1989b). These data are summarized in Table 26.
For an individual chemical, the lowest soil TCL from the three data sources will be used to assess future measured soil concentrations. Use of the values selected will result in conservative soil cleanup levels to support future removal action
decisions. If TCLs are less than background metals, background concentrations will be used as the TCL. 

  
 44 

 7.0 UNCERTAINTY EVALUATION 

Uncertainty is inherent in many aspects of the risk assessment process. Direct measurements are not available for many of the criteria upon which the risk
estimates are dependent (e.g., human exposure parameters, and the toxicity criteria used to assess the potential for adverse effects at. very low dose levels). Therefore, conservative assumptions and methodologies were employed to reduce the
possibility of underestimating risk. The following sections provide more detailed information on some, but not all, of the most significant areas of uncertainty. 

7.1 Toxicity Criteria and Factors 
 Many toxicity factors used in
human health risk assessments are based on animal data and, therefore, potentially overestimate risk. In most cases, the noncancer RID is calculated using animal data for nontoxic exposures that are extrapolated to humans and the RID is further
reduced using uncertainty and modifying factors (Section 5.1). These factors provide an inherently conservative RID. For chemicals that are classified as probable human carcinogens (i.e., lacking evidence of carcinogenicity in humans), the USEPA
method for developing cancer SFs extrapolates data from high-dose animal experiments to low-dose human exposures, and thus is associated with a high potential for overestimating risk. Actual SFs could be lower but are unlikely to be higher. The
linearized multistage model used to perform this extrapolation is considered conservative (Section 5.2). 
 For chronic and lifetime exposures, the
simplifying assumption that all chemical concentrations will remain constant is employed. This assumption is likely to result in an overestimate of chronic or lifetime exposure for chemicals that biodegrade over time or are undergoing remediation.

 When humans are exposed to more than one chemical in a medium, it is normally assumed that the adverse effects of the different chemicals are additive
(USEPA, 1989a). However, in some cases synergistic or antagonistic interactions may occur. Although there are no data to suggest that synergistic or antagonistic interactions occur between the COPCs at the Site, this possibility is nevertheless a
source of uncertainty in the HHRA. 
 7.2 Exposure Pathways and Parameters 

A large part of the risk assessment is the estimation of lifetime theoretical excess cancer risks and theoretical noncancer hazards that are conditional on the
occurrence of the exposure conditions analyzed. Although residential receptors were evaluated (adults and children), commercial parameters were used for the building inputs because the onsite residents would reside in dormitory-type housing that is
better approximated by commercial building parameters. Although other receptors might be present at a particular parcel (e.g., utility-worker receptors), the receptors evaluated for that parcel are those associated with the highest potential
exposures in terms of frequency and duration and are the most sensitive (e.g., children). 
 The exposure parameters (e.g., exposure frequency and duration,
dermal surface area, and oral and pulmonary absorption rates) have the potential for overestimating risk. Factors used to 

  
 45 

 
estimate exposure are assumed applicable for all human population groups. Therefore, to minimize the possibility of underestimating risks, such factors are generally conservative and represent
the portion of the population with the greatest potential for exposure. For example, the hypothetical HHRA indoor worker receptor is assumed present for 250 days of the year over a 25-year period for the RME calculation. The hypothetical RME
resident is also assumed home 24 hours daily, breathing vapors that are emitted from groundwater through the soil (either indoors or outdoors). Few people, including children, are likely to be at home for 24 hours daily for the entire exposure
period assumed. Consequently, the theoretical noncancer hazards and lifetime excess cancer risks are likely to be overestimated for the hypothetical receptors. 

7.3 Laboratory and Sampling Results 
 Potential laboratory errors
can also result in uncertainty in the chemical concentrations used in the exposure assessment. For well-designed analytical methods, there should be no significant systematic errors present. However, uncertainty in measured concentrations due to
random errors cannot be eliminated. These random errors may result from: 
  

	•	 	Precision of experimental measurements 

  

	•	 	Random fluctuation in equipment performance 

  

	•	 	Normal variation in experimental technique. 

 These errors are expected to be relatively smal1, but nonetheless
will affect the overall uncertainty in the results. The contribution of these random errors to under- or overestimation of risk cannot be ascertained. 

7.4 Soil Target Cleanup Levels 
 The soil TCLs discussed in
Section 6.4 and shown in Table 26 are not based on site-specific soil characteristics or site-specific receptors. While the PRGs and RBSLs can be re-calculated employing site-specific data, it is not expected to result in significant changes in
the cleanup levels shown in Table 26. 
 7.5 Site Air Concentration Measurements 

SAIC and Harding ESE have conducted several indoor air quality investigations (SAIC, 1999, 2000a; HLA, 2000ab; Harding ESE, 2001d). 

Comparison of the risks based upon measured air concentrations, and groundwater volatilization modeling shows after correcting for VC (groundwater) and
benzene (air) that the estimated risks based upon air and groundwater are in genera] agreement, although, the air-based risks are almost always higher than the groundwater-based estimates. Differences between risks based upon measured air
concentrations versus groundwater-modeled air concentrations may differ, in part, from the limited ability of the models to accurately predict air concentrations because of the simplifying assumptions necessary to construct the models. For indoor
air concentrations, some 

  
 46 

 
examples of these discrepancies are: (l) differences between the building ventilation rate used in the model and the actual rate, and (2) the assumed foundation surface crack fraction
available for infiltration versus the actual building value. 
 In addition to uncertainty resulting from model simplification, comparison of lifetime
excess cancer risks based upon volatilization modeling and lifetime excess cancer risks based upon direct air measurements, is complicated by the multiple contaminant sources being detected in the air measurements. Besides the normal background
chemicals measured by the BAAQMD, off gassing of contaminants from building materials, solvents, glues, toners, etc. used in buildings increases the measured concentrations above the groundwater contribution. It is not possible to adjust for these
additional contaminant sources; therefore, the lifetime excess cancer risks based upon air measurements wi11 tend to overestimate risks. For example, the BAAQMD does not measure 1,4-dioxane, which was present in most of the air samples. 

Therefore, no correction for background was possible, even though it is likely that some of the 1,4- dioxane in the air samples is not from groundwater. 

Risks based on measured air values must be corrected for benzene because measured air values at NRP are similar to the ambient levels measured in the Mountain
View area, based upon the 1999 BAAQMD data. Ambient benzene air concentrations measured at NRP ranged from non-detect to 1.6 ppbv. Concentrations of benzene in the ambient air in Mountain View ranged from. a low of 0.1 ppbv to a high of 2.80 ppbv
(mean 0.65 ppbv). In addition, there were many areas where benzene was detected in the air, but not in the groundwater. Under such circumstances, the levels of benzene detected in the onsite measurements are likely normal urban airborne benzene
levels. 
 Because the urban air in the Mountain View area appears to have relatively high levels of benzene, the lifetime incremental cancer risks to
persons living or working at NRP are likely to be higher from benzene from vehicle exhausts, than from volatilization of chemicals present in the contaminated groundwater. 

It should be noted that only single 8-hour outdoor samples were collected. While these samples are representative of the central tendency for this 8-hour
period, there may be considerable variation: throughout a full 24-hour monitoring period, from day-to-day and additional seasonal variation. A recent paper (Johnson, 2003) noted that for sites involving chlorinated hydrocarbon contamination, only
minor seasonal variation in air concentrations were observed. Data on diurnal variation was not available. NASA will be conducting a long term air monitoring study commencing June 30, 2003. Current plans call for the collection of both 8-hour
and 24-hour samples during the work week through December, 2003. These data will be used to evaluate both the diurnal and seasonal variation in air concentrations. 

7.6 Flux Measurements 
 Most of the chemicals detected during
flux sampling were also present in the groundwater samples. In a few instances, chemicals that were not detected in the groundwater sampling were detected during the flux sampling events. For a site with uniform lithology and a single VOC

  
 47 

 
groundwater contaminant, some level of correlation between the groundwater concentration and the measured flux can be expected. However, for a site as large as NRP, with complicated lithology,
shallow groundwater, and its density of underground utilities, correlation between VOC groundwater concentrations and measured flux will be poor, as observed at other South Bay sites. 

Other factors that will affect the correlation between groundwater and flux are the presence of small soil contaminant sources located in close proximity to
the flux sample sites, and variation in capillary fringe (capillary rise) thickness due to local variation in soil properties. Variation in soil lithology can include the presence of clay layers that can retard and alter the vapor transport pathway,
or soil lenses with high organic carbon content that can strongly adsorb VOCs. Use of fill, if present during construction activities, can also have a large local influence on soil vapor transport. Perturbations in lithology, whether due to natural
variation or human efforts (fill or utilities), can result in either enhanced or reduced measured flux values depending on the location of the perturbation with respect to the groundwater and the site of the flux measurement. 

In addition to soil- and site-specific factors, differences in chemical physical properties and the interaction of the chemicals with soil and groundwater
also affect flux. Some of these factors include the chemical s Henry’s constant, diffusion coefficient in air and water, solubility in water, and organic carbon absorption coefficient (Koc). All of these factors, plus others, results in a
complex relationship between these physical factors and the resulting surface soil flux values. 
 7.7 Calculation of Modeled Airborne VOC Concentrations

 Indoor air concentrations were calculated from groundwater data based on assumptions about the proportion of the building foundation through which vapors
could potentially migrate and building venti1ation rate. Conservative assumptions were made for both of these parameters. If these assumptions are greater than actual building parameters, the resulting risks will be overestimates of the actual risk.

 Outdoor air concentrations are based on a simple box model that requires assumptions about the width of the box, the height of the receptor, and wind
speed. Of these three parameters, only wind speed is based on site-specific data. Width of the box (30 meters) is based on estimates of the likely distance between buildings. This value can vary depending upon the actual location of the receptor
relative to the location of the buildings on site 2. 
 7.8 Volatilization Model 

The volatilization model described in Section 4.7.3 is an infinite-source model that incorporates the following conservative assumptions: 

 

	•	 	A constant chemical concentration in subsurface soil and/or groundwater. 

  

	•	 	For groundwater sources, equilibrium partitioning between dissolved chemicals in groundwater and chemical vapors at the groundwater table. 

  
 48 

	•	 	Steady state vapor- and liquid-phase diffusion through the capillary fringe, vadose zone, and foundation cracks. 

  

	•	 	No loss of chemical mass as it diffuses towards the ground surface, (e.g., no biodegradation). 

  

	•	 	Steady, well-mixed atmospheric dispersion of the emanating vapors within the enclosed space, where convective transport into the building through the foundation cracks is negligible compared to diffusive transport.

 Because few site-specific parameters were available, conservative default parameters were used in most cases. These assumptions, as well as
a conservative air exchange rate, may add a factor of 5 to 20 and may result in potentially overestimated indoor air concentrations. 
 Although different
models were used to estimate ambient air and indoor air concentrations, similar assumptions were used for both models. Additional conservative assumptions used in the ambient air model include: steady, wel1-rnixed atmospheric dispersion of the
emanating vapors within the breathing zone as modeled by the “box model” for air dispersion. Site-specific parameters were used where possible; however, these models are intentionally conservative to avoid underestimating ambient air
concentrations. 
 7.9 1,1-DCE Carcinogenicity Assessment 

IRIS (USEPA, 200la) lists 1,1-DCE as a Class C carcinogen. Recently, the USEPA published an external-review draft of the toxicological review of 1,1-DCE
(USEPA, 200Jb). An external-review draft of a new IRIS summary has also been published (VSEPA, 2001c). Both documents contain data that call into question the currently published IRJS SF for 1,1-DCE. The IRIS external review summary, resulted in
withdrawal of the SF of 0.6 (mg/kg-day)-1 for 1,1-DCE (i.e., 1,1-DCE would no longer be considered a carcinogen in risk assessments). Thus, calculation of total risk excluded 1,1-DCE. If additional information comes to light that results in
re-instatement of the slope factor, then this HHRA will result in underestimation of risk for those wells and buildings where 1,1-DCE was detected. Only a small number of wells would have contributions to lifetime excess cancer risk due to 1,1-DCE
greater than lx10-6, none of which would be greater than 1x10-5. Therefore, this is not likely to have a significant impact on the overall results. 
 7.10
TCE Health Risk Assessment 
 USEPA recently evaluated the health risk from exposure to TCE. Recently, an external review draft of the Trichloroethylene
Health Risk Assessment has been published (USEPA, 200Jd). This assessment emphasizes the role that TCE metabolites play in both the carcinogenic and non-carcinogenic health effects and the importance of metabolites (such as trichloroethanol) that
also result from exposure to chemicals other than TCE, such as PCE. Consequently, exposure to chemicals (such as alcohol) and pharmaceuticals (e.g., acetaminophen) that use the same enzymatic pathways as TCE may have important impacts on the overall
toxicity of TCE to the exposed population. 

  
 49 

 In addition, new cancer risk slope factors and reference concentrations are presented in the USEPA assessment.
The new cancer risk slope factor ranges from 2xl0-1 to 4x10-1 (mg/kg-day)-1 for both the inhalation and oral ingestion pathways. As presented in Table 15, the inhalation cancer risk slope factor (SFi) used in
this HHRA was 0.4 (mg/kg-day)-1. If the new slope factors are not adopted, the estimated risk due to TCE exposure in this HHRA is overestimated by a factor of 20 to 40, relative to the older value. The current SFi published in the Cal/EPA Toxicity
Criteria Database (Cal/EPA, 2001) for TCE is 7x10-3 (mg/kg-day)-1. USEPA is also suggesting changing the current inhalation reference concentration (RfC) from 6xl0-3 mg/kg-day to 4x10-2 mg/kg-day (the value used in this HHRA). Adoption of the new
RfC value means that this HHRA underestimates the potential non-carcinogenic health effects due to TCE inhalation exposures by a factor of approximately 7, if the new RfC is not adopted. 

7.11 Benzene Health Risk Assessment 
 SFs for this assessment
were compiled from Cal/EPA’s Toxicity Criteria Database (Cal/EPA, 2001) and IRIS (USEPA, 200J a). For each COPC and exposure route, the higher SF from these two sources was used. The Cal/EPA Toxicity Criteria Database (Cal/EPA, 2001) SFo and
SFi for benzene are both lx 10-1 (mg/kg-day)-1 whereas the U.S. EPA SFo for benzene is l.5-5.5x 10-2. Use of the Cal/EPA derived slope factor could result in over estimation of benzene risk by approximately factor of 2 to 7, relative to the range of
slope factors derived by the U.S. EPA. If the U.S. EPA derived SFo is used in the calculation of -carcinogenic benzene risk, then uncertainty in the resulting risk spans approximately a 3-fold range (but lower than the estimated using the Cal/EPA
SFo). 
 7.12 Factoring Out Vinyl Chloride Concentrations 

Based upon review of Tables 16 to 20, factoring out the vinyl chloride concentrations from the risk calculation where it was present in the groundwater, but
not flux or air samples, will have only minor impacts on the overall risks. Of the 89 wells, 29 had vinyl chloride concentrations that significantly affected the risk. Of these 29 wells, the difference between risks calculated with vinyl chloride
and without vinyl chloride were less than l0% for 23 of the 29 wells. This analysis suggests that while there may be some very significant differences for some individual wells, exclusion of vinyl chloride from the final risk calculations had no
material impact on the overall risk results. 
 8.0 SUMMARY AND CONCLUSIONS 

The HHRA was conducted to evaluate risks to human health at 17 of the 19 parcels that comprise the NRP. Four parcels (9, 10, 11, and 16) were not included
because: (1) concentrations of VOCs in groundwater beneath these areas were detected below regulatory criteria, and (2) hazardous materials or wastes at the four parcels, if present, do not appear to have impacted the environment (Harding
ESE, 200lc). 

  
 50 

 The HHRA evaluated potential health risks to indoor workers, construction workers, adult residents, child
residents, and a default 30 year resident (6 years child and 24 years adult). 
 Only the default 30-year residential receptor had multiple wells for which
the estimated excess lifetime cancer risks were above lxl0-4. For the other receptors, the lifetime excess risks were mostly within the USEPA risk management range. 

RME and CTE HIs for the construction worker were greater than 1 for numerous wells, based upon the groundwater volatilization model results. Appropriate use
of personnel protective equipment, enforcement of applicable institutional controls, and use of soil TCLs should be sufficient to reduce exposures to acceptable levels. 

In general, the lifetime excess cancer risks and HIs were highest for wells and buildings within, or just adjacent to, parcel 15. The results of the HHRA are
summarized as follows: 
  

	•	 	Maximum RME lifetime excess cancer risk for construction workers was within the USEPA risk management range (lx 10-6 to lx 10-4) based upon the groundwater volatilization modeling and direct air measurement results. The
maximum estimated RME and CTE HIs for the construction worker, based upon the groundwater volatilization modeling and direct air measurements were greater than 1. This is primarily due to direct exposure to the contaminated groundwater.

  

	•	 	RME lifetime excess cancer risks for indoor workers, estimated from the groundwater volatilization model, were within or below the risk management range, except for one wen in parcel 15 (W9-35). RME lifetime excess
cancer risk estimated from the air measurements was above the risk mJlnagement range (2.3E-4) for four buildings (Building 156, 566, 6 and Hangar 1), but within the risk management range for the remaining buildings. However, lifetime estimated
excess cancer risks estimated from wells near Buildings 156 and 566 were an in the lower end of the risk management range. This high estimated lifetime excess cancer risk for Buildings 156 and 566 may due to sources other than contaminated
groundwater (note that Building 156 is very close to highway 101) or there may be high contaminant levels in the soil or groundwater close to the building, but which are not detected in the current monitoring wells. If the results for Building 156
are considered anomalous, then Hangar 1 has the highest estimated lifetime excess cancer risk. This building is adjacent to Well W9-35, which has the highest estimated lifetime excess cancer risk based upon the groundwater volatilization modeling.
This suggests that the results for Hangar 1 are associated with contaminants in the groundwater. Maximum RME HIs for indoor workers estimated from both the groundwater volatilization model and direct air measurements were less than or equal to 1 and
the CTE HIs were less than 1. 

  

	•	 	 Maximum RME and CTE lifetime excess cancer risks for adult residents (10 year and 5 year exposure duration,
respectively), estimated from the groundwater volatilization model, were within or below the risk management range. RME lifetime excess cancer risks estimated from the air measurements were above the risk management range for Building 156, 6, and
Hangar 1 but within the risk management range for the remaining bui1dings. The high estimated lifetime excess cancer risk for Building 156 may due to sources other than contaminated groundwater,

  
 51 

	 	 
because the risks estimated from wells in the vicinity of this building were all below or at the low end of the risk management range. If the results for Building 156 are considered anomalous,
then Hangar 1 has the highest estimated lifetime excess cancer risk. CTE lifetime excess cancer risks estimated from the air measurements were below the risk management range for Building 111, and within the risk management range for the remaining
buildings. Maximum RME HIs for adult residents (10 year exposure duration) estimated from the groundwater volatilization model were less than 1. Maximum RME HIs based upon direct air measurements were greater than 1 (Building 6), but the CTE (5 year
exposure duration) HIs for all buildings were less than 1. 

  

	•	 	RME lifetime excess cancer risks for child residents (10 year exposure duration), estimated from the groundwater volatilization model, were within or below the risk management range except for two wells (W9-35 and W9-2)
in parcels 15 and 13. CTE lifetime excess cancer risks for child residents (5 year exposure duration), estimated from the groundwater volatilization model, were within or below the risk management range for all parcels. RME lifetime excess cancer
risk estimated from the air measurements was above the risk management range for Buildings 148, 2, 21, 566, 156, 6, and Hangar 1. As discussed previously, the results for Buildings 566, 21 and 156 may be due to sources other than groundwater
contamination. However, the results for the remaining buildings appear to be associated with groundwater contaminants, based upon comparison to lifetime excess cancer risk estimated from wells near these buildings using the groundwater
volatilization model. Maximum RME lifetime excess cancer risk estimated from contaminant concentrations in wells near Buildings 566, 21 and 156 were between one to two orders of magnitude lower than risks estimated from the indoor air measurements.
Maximum RME (10 year exposure duration) and CTE (5 year exposure duration) HIs for child residents estimated from the groundwater volatilization model were less than 1. Maximum RME (I 0 year exposure duration) HIs for child residents estimated from
direct air measurements were greater than 1 for Building 6, but less than or equal to 1 for the remaining buildings. Maximum CTE (5 year exposure duration) child resident HIs were less than or equal to 1 for all buildings. 

 

	•	 	Maximum RME lifetime excess cancer risk for 30-year residents, estimated from the groundwater volatilization model, was above the risk management range. RME lifetime excess cancer risk estimated from the air
measurements was also above the risk management range for Buildings 148, 156, 2, 21, 476, 566, 6, and Hangar 1. As discussed previously, the results for Buildings 566, 156, 21 and 476 may be due to sources other than groundwater contamination. The
maximum excess lifetime cancer risks estimated from contaminant concentrations in wells in the vicinity of these buildings were all lower by at least one order of magnitude. However, the results for the other buildings do appear to be associated
with groundwater contaminants, based upon comparison to lifetime excess cancer risk estimated from wells near these buildings using the groundwater volatilization model. Maximum adult and child His, estimated from both the groundwater volatilization
model and direct air measurements, were greater than 1. 

 Based upon both the groundwater volatilization and direct air measurement results,
there do appear to be some receptors (primarily construction workers, children, and the 30 year residents) with exposure to contaminants that potentially could result in adverse health effects. These exposures can be reduced to acceptable levels by
using appropriate and applicable construction and HVAC technologies in existing buildings and in new construction and use of PPE by workers during construction. Institutional controls that would limit land use may also be appropriate. 

  
 52 

 As previously discussed (Sections 4.7.3.l and 6.3.l.l), these results are lower than the results pr
                     the Draft Addendum HHRA dated December 16, 2003, due to changes, based upon received comme
                     (see appendix F), in some of the input parameters for the groundwater to air volatilization model. 

The Environmental Issues Management Plan (EIMP) 
 Although most
risks estimated in the HHRA were below or within USEPA’s risk management range, uncertainties in the data and in Site conditions will require the known and unexpected risks to be carefully managed. An Environmental Issues Management Plan (EIMP)
is being prepared by Erler & Kalinowski, Inc. (EKI; EK1, 2001). This plan provides a decision framework that will be used to manage potential residual chemicals in soil and groundwater in a manner that is acceptable to NASA and the
regulatory agencies, and is protective of human health and the environment. For the NRP, lxl0-6 is the acceptable lifetime excess cancer risk level. 

  
 53 

 9.0 LITERATURE CITED 

American Cancer Society, 1999. Cancer: Basic Facts, 1999 Facts and Figures. Website location: www.cancer.org/statistics/cff99/basicfacts.html. 

American Society of Heating, Refrigeration, and Air-Conditioning Engineers (ASHRAE), 2000. Ventilation for Acceptable Indoor Air Quality. ASHRAE Standard
62-1999. August. 
 American Society for Testing and Materials (ASTM), 1995. Standard Guide for Risk-Based Corrective Action Applied at Petroleum Release
Sites. ASTM E 1739-95. 
 Brady & Associates, Inc., 1994. Final Environmental Assessment, Moffett Field Comprehensive Use Plan, Moffett Field,
California. August. 
 Bay Area Air Quality Management District (BAAQMD), 2000. Toxic Air Containment Control Program Annual Report 1999. December. 

California Environmental Protection Agency (Cal/EPA), 1999. Preliminary Endangerment Assessment Guidance Manual: A Guidance Manual for Evaluating Hazardous
Substance Release Sites. Department of Toxic Substances Control. June. 
             ,
2001. Toxicity Criteria Database. Office of Environmental Health Hazard Assessment. http://www.oehha.ca.gov/risk/chemicalDB/index.asp. 
 California
Regional Water Quality Control Board (RWQCB), 2000. Application of Risk-based Screening Levels and Decision Making to Sites With Impacted Soil and Groundwater. San Francisco Bay Region. August. 

Daugherty, S.J., 1991. Regulatory Approach to Hydrocarbon Contamination from Underground Storage Tanks. In Hydrocarbon Contaminated Soils and Groundwater,
P.T. Kostecki and E.J. Calabrese eds. Cheslea, MI. Lewis Publishers. 
 Design, Community, and Environment (DCE), 2001 NASA Ames Development Plan, Draft
Programmatic Environmental Impact Statement, NASA Ames Research Center. Design, Community, and Environment, November. 
 Design, Community, and Environment
(DCE), 2002. NASA Ames Development Plan Final Programmatic Environmental Impact Statement, NASA Ames Research Center. Design, Community, and Environment, July. 

Gilbert, R.O., 1987. Statistical Methodsfor Environmental Pollution Monitoring. Van Nostrand Reinhold. ISBN 0-442-23050-8. 

Harding ESE, Inc. (Harding ESE), 2001a. Environmental Baseline Survey, NASA Research Park Parcel 5, Moffett Federal Airfield, Moffett Field, California.
March 5. 

  
 54 

             , 2001b. Draft° Final
Environmental Baseline Survey, NASA Research Park Parcels 2, 3, 4, 6, and 7, Moffett Federal Airfield, Moffett Field. California. Internal Draft. May 7. 

            , 2001c. Draft Indoor Air Quality Investigation Buildings 2, 15, 555, and 583C,
Moffett Federal Airfield. Draft. September 5. 
             , 2002. Human Health
Risk Assessment Work Plan, NASA Research Park, Moffett Field, California. July. 
 Harding Lawson Associates (HLA [now Harding ESE, Inc.]), 1988. Remedial
Investigation Report, Middlefield-Ellis-Whisman Area, Mountain View, California. 

            , 2000a. Environmental Baseline Survey, NASA Research Park Parcel 1, Moffett
Federal Airfield, Moffett Field, California. October 18. 
             , 2000b.
Indoor Air Quality Investigation, Buildings 476 and 543, Ames Research Center. July 14. 
 Holmes, K.K., J.H. Shirai, K.Y. Richter, and J.C. Kissel,
1999. Field Measurement of Dermal Soil Loadings in Occupational and Recreational Activities. Journal of Environmental Research. 80(2), )48. 
 ICF-Clement,
1988. Endangerment Assessment for the Middlefield-Ellis-Whisman Site, Mountain View, California. June 15. 
 International Technology Corporation (IT),
1993a. Remedial Investigation Report Operable Unit 2: Sites 3-11, 12, 14, 16-19 Soils, NAS Moffett Field, California. April. 

            , 1993b. Remedial Investigation Report Operable Unit 1: Landfill Sites 1 and 2,
NAS Moffett Field, California. March. 
 Johnson, P.C., et. al., 2003. Evaluation of the Johnson and Ettinger Model for Prediction of Indoor Air Quality.
Groundwater Monitoring and Remediation. 23(2):119-133. 
 Kissel, J.,K. Richter, and R. Fenske, 1996. Field Measurements of Dermal Soil Loading Attributable
to Various Activities: Implications for Exposure Assessment. Risk Analysis. 16(1): 116-125. 
 Land, C.E., 1975. Tables of Confidence Limits for Linear
Functions of the Normal Means and Variance, in Selected Tables in Mathematical Statistics, Vol. Ill. Providence, Rhode Island. American Mathematical Society. pp. 385-419. 

Locus Technologies (Locus), 1999. Remedial Action Report, Regional Ground Water Remediation Program, Middlefield-Ellis-Whisman Site, Mountain View,
California. December. 

  
 55 

 National Toxicology Program (NTP), 2001. Toxicology and Carcinogenisis Studies of Naphthalene in B6C3Fl Mice
(Inhalation Studies). TR-410. http://ntp-server.niehs.hiim.gov/htdocs/LT-studies/tr410.html. 
 PRC Environmental Management, Inc. (PRC), 1996. Final
Station-Wide Remedial Investigation Report, Moffett Federal Airfield, California. May 21. 

                    , and Montgomery Watson (MW),
1995. Final Phase I Site-wide Ecological Assessment. Moffett Federal Airfield, California. September. 

                    , and Montgomery Watson (MW),
1997. Final Phase II Site-wide Ecological Assessment. Moffett Federal Airfield, California. July. 
 SAIC, 1999. NASA AM ES Research Center. Indoor Air
Testing Program Report for Building 566. December. 
             , 2000. NASA AM ES
Research Center. Indoor Air Testing Program Report for Hangar 1 and Buildings 6, 21, 22, 26, 111, 148, 156, and 269. 
 Schulz, T.W., and S. Griffin, 1999.
Estimating Risk Assessment Exposure Point Concentrations When Data Are Not Normal or Lognormal. Risk Analysis. 19(4): 577-584. 
 Shapiro, S.S., and M.B.
Wilk, 1965. An Analysis of Variance Test for Normality (Complete Samples). Biometrika 52: 591-611. 
 Singh, A., and Englehardt, M., 1997. The Lognormal
Distribution in Environmental Applications. Technology Support Center Issue, United States Environmental Protection Agency, Office of Research and Development, Office of Solid Waste and Emergency Response, Technology Support Center for . Monitoring
and Site Characterization, National Exposure Research Laboratory, Environmental Sciences Division. Las Vegas, Nevada. EPA/600/R-97/006. December. 
 Tetra
Tech EM, Inc. (Tetra Tech), 1998. Final Station-Wide Feasibility Study Report. October 30. 

            , 1999a. Remaining UST Sites Investigation, Field Work Plan. Draft.
February 15. 
             , 1999b. November 1998, Draft Quarterly Report,
Moffett Federal Airfield, California. March 31. 
 United States Environmental Protection Agency (USEPA), 1986a. Guidelines for Carcinogen Risk
Assessment. Federal Register. 51(185): 33992-34003. 
             , 1986b. Measurement
of Gaseous Emission Rates From Land Surfaces Using .an Emission Isolation Flux Chamber, Users Guide. EPA Environmental Monitoring Systems Laboratory, Las Vegas, Nevada, EPA Contract No. 68-02-3889, Work Assignment No. 18, Radian
Corporation, February 1986. NTIS # PB 86-223161. 

  
 56 

             , l989a. Risk Assessment Guidance
for Superfund, Volume /, Human Health Evaluation Manual (Part A). Office of Emergency and Remedial Response. EPA/54011-89/002. December. 

            , 1989b. Record of Decision, Middlefield/Ellis/Whisman Study Area (MEW Site),
Mountain .View, California. June 9. 
             , 1991a. Risk Assessment Guidance
for Superfund, Volume/, Human Health Evaluation Manual, Supplemental Guidance, Standard Default Exposure Factors. Office of Emergency and Remedial Response. OSWER Directive 9285.6-03. June. 

            . 1991b. Role of the Baseline Risk Assessment in Superfund Remedy Selection
Decisions. Office of Solid Waste and Emergency Response. Directive 9355.0-30. April .22. 

            , 1992a Supplemental Guidance to Risk Assessment Guidance for Superfund Sites
(RAGS): Calculating the Concentration Term. Office of Solid Waste and Emergency Response. 

            , 1992b Air/Superfund National Technical Guidance Study Series; Assessing
Potential Indoor Air Impacts for Superfund Sites. Office of Air Quality. EPA-451/R-92-002. September. 

            , 1993. Provisional Guidance for Quantitative Risk Assessment of Polycyclic
Aromatic Hydrocarbons. EPA/600/R-93/089. Office of Research and Development. July. 

            , 1995. Land Use in the CERCLA Remedy Selection Process. OSWER Directive
No. 9355.7-04. Office of Solid Waste and Emergency Response. May 25. 

            , 1996. Proposed Guidelines for Carcinogen Risk Assessment. Office of Research
and Development. EPA/600/P-92/003C. April. 
             , 1997a. Exposure Factors
Handbook. Office of Research and Development. EPA/600/P-95/002Fa. August. 

            , 1997b. The Lognormal Distribution in Environmental Applications-Technology
Support Center Issue. Office of Research and Development and Office of Solid Waste and Emergency Response. EPA/600/R-97/006. December. 

            , 1997c. Health Effects Assessment Summary .Tables (HEAST). Office of Solid
Waste and Emergency Response. July. 
             , 1998. Risk Assessment Guidance for
Superfund, Volume I: Human Health Evaluation Manual, Supplemental Guidance for Dermal Risk Assessment, Interim Guidance. Internal Draft. Office of Emergency and Remedial Response May. 

  
 57 

             , 1999. Risk Assessment Guidance
for Superfund, Volume I: Human Health Evaluation Manual, Supplemental Guidance for Dermal Risk Assessment, Interim Guidance. Office of Solid Waste and Emergency Response. EPA/540/R- 991005. 

            , 2000. User’s Guide for the Johnson and Ettinger (1991) model for
Subsurface Vapor Intrusion into Building (Revised)s. Office of Emergency and Remedial Response. September. 

            , 200la. Integrated Risk Information System (IRIS). Website location:
http://www.epa.govIngispgm3/iris/index.htm. 
             , 200l b. Toxicological Review
of 1,1-Dichloroethene. External Peer Review Draft. National Center for Environmental Assessment. NCEA-S-1011. April. (see also Website: http://www.epa.gov/superfund/programs/risk/toolthh.htm#HIDA). 

            , 200lc. IRIS Summary. External Peer Review Draft. NCEA. April. (see also
Website: http://www.epa.gov/superfund/programs/risk/toolthh.htm#HIDA) 
             ,
200ld. Trichloroethylene Health Risk Assessment: Synthesis and Characterization. External Review Draft. Office of Research and Development. EPA/600/p-O 1l /002A. August. 

            , 2001e. Risk Assessment Guidance for Superfund; Volume I: Human Health
Evaluation Manual (Part E, Supplemental Guidance for Dermal Risk Assessment ) Interim. Review Draft - For Public Comment. Office of Emergency and Remedial Response. EPA/540/R/ 991005. September. 

            , 2002a. Region IX Preliminary Remediation Goals. From Stanford J. Smucker,
Regional Toxicologist, November 1. Website location: ww.epa.gov/region09/waste/sfund/prg/index.htinl. 

            , 2002b. Calculating Upper Confidence Limits for Exposure Point Concentrations
At Hazardous Waste Sites. Office of Emergency and Remedial Response. OSWER 0285.6-10. December. 

  
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 12 

 ENVIRONMENTAL ISSUES 

MANAGEMENT PLAN 
 NASA
Research Park 
 Santa Clara County, California 

DRAFT FINAL 

30 July 2004 

Prepared for: 
 DMJM 

394 Pacific Avenue, Third Floor 

San Francisco, California 94111 

Prepared by: 
 Erler &
Kalinowski, Inc. 
 1870 Ogden Drive 

Burlingame, California 94010 
 EKI
A20044.00 

 ENVIRONMENTAL ISSUES MANAGEMENT PLAN 

NASA Research Park 
 Santa Clara
County, California 
 TABLE OF CONTENTS 
  

													
	 EXECUTIVE SUMMARY
	  	 	ES-1	 
			
	 1.
	  	 INTRODUCTION
	  	 	1-1	 
				
		  	1.1.	  	 Representations
	  	 	1-1	 
				
		  	1.2.	  	 Responsibilities
	  	 	1-2	 
			
	 2.
	  	 SITE BACKGROUND
	  	 	2-1	 
				
		  	2.1.	  	 Site Setting
	  	 	2-1	 
		  	2.1.1.	  	 Hydrogeology
	  	 	2-1	 
				
		  	2.2.	  	 Site History
	  	 	2-2	 
				
		  	2.3.	  	 Summary of Known Site Environmental Conditions and Potential Chemicals of
Concern
	  	 	2-2	 
				
		  	2.4.	  	 Summary of Site Investigations and Remedial Actions
	  	 	2-4	 
		  		  	 2.4.1.
	  	 Available Documents
	  	 	2-4	 
		  		  		  	2.4.1.1.	  	 Environmental Baseline Survey
	  	 	2-4	 
		  		  		  	2.4.1.2.	  	 Closure Plans
	  	 	2-5	 
		  		  	2.4.2.	  	 Installation Restoration Program
	  	 	2-5	 
		  		  	2.4.3.	  	 West Side Aquifer Groundwater Contamination
	  	 	2-6	 
		  		  	2.4.4.	  	 Installation Restoration Program Sites
	  	 	2-8	 
		  		  		  	2.4.4.1.	  	 IRP Site 10 (Chase Park)
	  	 	2-9	 
		  		  		  	2.4.4.2.	  	 IRP Site 14-North
	  	 	2-9	 
		  		  		  	2.4.4.3.	  	 IRP Site 16 (Sump 60)
	  	 	2-9	 
		  		  		  	2.4.4.4.	  	 IRP Site 17 (Sump 61)
	  	 	2-10	 
		  		  		  	2.4.4.5.	  	 IRP Site 18
	  	 	2-10	 
		  		  	2.4.5.	  	 Petroleum Sites
	  	 	2-11	 
		  		  		  	2.4.5.1.	  	 Naval Exchange Gasoline Service Station
	  	 	2-12	 
		  		  		  	2.4.5.2.	  	 IRP Site 9
	  	 	2-13	 
		  		  		  	2.4.5.3.	  	 IRP Site 14-South
	  	 	2-14	 
		  		  		  	2.4.5.4.	  	 IRP Site 15
	  	 	2-14	 
		  		  		  	2.4.5.5.	  	 IRP Site 19
	  	 	2-15	 
		  		  		  	2.4.5.6.	  	 IRP Site 24
	  	 	2-16	 
		  		  	2.4.6.	  	Survey of Lead in Soil	  	 	2-16	 
		  	2.5.	  	 Summary of Existing Subsurface Structures That May Require Removal
	  	 	2-18	 

  
 i 

 ENVIRONMENTAL ISSUES MANAGEMENT PLAN 

NASA Research Park 
 Santa Clara
County, California 
  

													
		  	2.6.	  	 Summary of Hazardous Materials Associated With Existing Structures And Current
Operations
	  	 	2-18	 
		  		  	2.6.1.	  	 Asbestos-Containing Materials
	  	 	2-18	 
		  		  	2.6.2.	  	 Lead-Based Paints
	  	 	2-19	 
		  		  	2.6.3.	  	 PCBs in Equipment and Building Materials
	  	 	2-19	 
		  		  	2.6.4.	  	 Other Hazardous Materials and Hazardous Waste
	  	 	2-20	 
	 3.
	  	 PLANNED DEVELOPMENT OF NASA RESEARCH PARK
	  	 	3-1	 
				
		  	 3.1.
	  	 Current Land Use
	  	 	3-1	 
				
		  	 3.2.
	  	 Planned Land Use
	  	 	3-1	 
			
	 4.
	  	 REVISED HUMAN HEALTH RISK ASSESSMENT AND DEVELOPMENT OF SOIL TARGET
CONCENTRATION LEVELS
	  	 	4-1	 
				
		  	4.1.	  	 Potential Exposure Pathways
	  	 	4-1	 
		  	4.2.	  	 NRP Revised Human Health Risk Assessment
	  	 	4-2	 
		  		  	 4.2.1.
	  	 Scope of Revised HHRA
	  	 	4-2	 
		  		  	 4.2.2.
	  	 Results of Revised Human Health Risk Assessment
	  	 	4-3	 
		  	4.3.	  	 Development of Soil Target Concentration Levels
	  	 	4-4	 
		  		  	 4.3.1.
	  	 RWQCB ESLs
	  	 	4-4	 
		  		  	 4.3.2.
	  	 U.S. EPA PRGs
	  	 	4-5	 
		  		  	 4.3.3.
	  	 MEW ROD
	  	 	4-5	 
		  		  	 4.3.4.
	  	 Navy Action Levels and Risk-Based Screening Levels for Petroleum Products and
Constituents
	  	 	4-5	 
		  		  		  	4.3.4.1.	  	 Action Levels for Petroleum Products and Constituents
	  	 	4-5	 
		  		  		  	4.3.4.2.	  	 Current Approach to Assessment of Former NAS Moffett Field Petroleum Sites
	  	 	4-6	 
		  		  		  	4.3.4.3.	  	 Navy Risk Assessment of Former NAS Moffett Field Petroleum Site 9
	  	 	4-6	 
		  		  	 4.3.5.
	  	 Background Metals Concentrations
	  	 	4-7	 
		  	4.4.	  	 Risk Goals for NRP
	  	 	4-7	 
			
	 5.
	  	 RISK MANAGEMENT DESIGN CONSIDERATIONS FOR NEW CONSTRUCTION AND EXISTING
BUILDINGS
	  	 	5-1	 
				
		  	5.1.	  	 Measures to Address VOC Vapor Intrusion into New Construction and Existing
Buildings
	  	 	5-1	 
		  		  	 5.1.1.
	  	 The Vapor Intrusion Process
	  	 	5-1	 
		  		  	 5.1.2.
	  	 Vapor Intrusion Mitigation Area
	  	 	5-2	 
		  		  		  	 5.1.2.1.
	  	 Evaluation of Vapor Intrusion at 5 ug/L TCE in Groundwater
	  	 	5-3	 
		  		  		  	 5.1.2.2.
	  	 Conservative Nature of 5 ug/L TCE Criterion
	  	 	5-6	 

  
 ii 

 ENVIRONMENTAL ISSUES MANAGEMENT PLAN 

NASA Research Park 
 Santa Clara
County, California 
  

													
		  		  	 5.1.3.
	  	 Vapor Intrusion Mitigation Measures
	  	 	5-6	 
		  		  		  	5.1.3.1.	  	 Design Guidance for Vapor Intrusion Mitigation
	  	 	5-6	 
		  		  		  	5.1.3.2.	  	 Active Sub-Slab Depressurization (SSD)
	  	 	5-7	 
		  		  		  	5.1.3.3.	  	 Continuous Positive-Pressure Ventilation (PPV)
	  	 	5-8	 
		  		  		  	5.1.3.4.	  	 Ventilated Parking Garage Construction
	  	 	5-9	 
		  		  		  	5.1.3.5.	  	 Sub-Membrane Depressurization (SMD) for Crawl Spaces
	  	 	5-10	 
		  		  		  	5.1.3.6.	  	 Vapor Intrusion Barrier
	  	 	5-10	 
		  		  		  	5.1.3.7.	  	 Sealing Cracks and Utility Penetrations in the Floor
	  	 	5-11	 
		  		  		  	5.1.3.8.	  	 Mitigating Vapor Intrusion in Existing Buildings
	  	 	5-11	 
		  		  	5.1.4.	  	 Design of Vapor Intrusion Mitigation Measures
	  	 	5-11	 
		  		  	5.1.5.	  	 Monitoring Vapor Intrusion Mitigation Effectiveness
	  	 	5-12	 
		  	5.2.	  	 Reducing the Potential for Lateral Migration of VOCs in Utility
Corridors
	  	 	5-12	 
		  		  	5.2.1.	  	 Utilities Subject To Mitigation Measures
	  	 	5-12	 
		  		  	5.2.2.	  	 Measures to Mitigate Groundwater Movement in Utility Backfill
	  	 	5-13	 
		  		  	5.2.3.	  	 Measures to Reduce Groundwater Infiltration into Utility Pipes
	  	 	5-13	 
		  		  	5.2.4.	  	 Design of Utility Lines
	  	 	5-14	 
		  		  	5.2.5.	  	 Soil and Groundwater Handling During Utility Line Construction
	  	 	5-14	 
		  	5.3.	  	 Reducing the Potential for Creating Conduits to Deeper Groundwater Zones During
Pile or Elevator Shaft Installation
	  	 	5-14	 
		  	5.4.	  	 Removal or Relocation/Replacement of Existing Groundwater Monitoring Wells and
Remediation System Pipelines
	  	 	5-15	 
		  		  	5.4.1.	  	 NASA Agreements Relating to Coordination of NRP Development with the Navy and MEW
Companies’ Groundwater Remediation Systems
	  	 	5-15	 
		  		  	5.4.2.	  	 Pre-Construction Coordination
	  	 	5-16	 
			
	 6.
	  	 RISK MANAGEMENT DURING CONSTRUCTION
	  	 	6-1	 
				
		  	 6.1.
	  	 General Approach for Conducting Environmental Sampling and Treatment/Disposal of
Impacted Material During Site Development
	  	 	6-1	 
		  		  	 6.1.1.
	  	 Environmental Sampling
	  	 	6-2	 
		  		  	 6.1.2.
	  	 Excavation or Removal of Impacted Soil or Groundwater and Other Materials Relating
to Potential Chemical Impacts
	  	 	6-2	 
		  		  	 6.1.3.
	  	 Treatment or Disposal of Impacted Soil and Groundwater, Tanks, Sumps, Abandoned
Pipes or Chemical Containers
	  	 	6-2	 
		  	6.2.	  	 Site-Specific Health And Safety Worker Planning Requirements
	  	 	6-3	 
		  		  	 6.2.1.
	  	 Planning Requirements for Contractors
	  	 	6-3	 
		  		  	 6.2.2.
	  	 Worker Training
	  	 	6-4	 
		  		  	 6.2.3.
	  	 Components of the Health and Safety Plan
	  	 	6-4	 
		  	6.3.	  	 Construction Impact Mitigation Measures
	  	 	6-8	 
		  		  	6.3.1.	  	 Dust Control Measures
	  	 	6-8	 

  
 iii 

 ENVIRONMENTAL ISSUES MANAGEMENT PLAN 

NASA Research Park 
 Santa Clara
County, California 
  

													
		  		  	6.3.2.	  	 Decontamination
	  	 	6-9	 
		  		  	6.3.3.	  	 Storm Water Pollution Controls
	  	 	6-9	 
		  		  	6.3.4.	  	 Dewatering
	  	 	6-10	 
				
		  	 6.4.
	  	 Management of Asbestos Containing Debris
	  	 	6-12	 
				
		  	 6.5.
	  	 Management of Debris Containing Lead-Based Paint
	  	 	6-13	 
				
		  	 6.6.
	  	 Removal of PCB-Containing Equipment
	  	 	6-13	 
				
		  	 6.7.
	  	 Management of Abandoned Underground Storage Tanks, Sumps, and Buried Drums and
Containers
	  	 	6-13	 
				
		  	 6.8.
	  	 Management of Abandoned Pipes
	  	 	6-15	 
				
		  	 6.9.
	  	 Protection and Removal/Relocation of Monitoring Wells and Remediation System
Components
	  	 	6-15	 
		  		  	6.9.1.	  	 Removal or Relocation of Remediation System Components
	  	 	6-16	 
		  		  	6.9.2.	  	 Protection of Groundwater Wells and Remediation System Components
	  	 	6-16	 
		  		  	6.9.3.	  	 Shutdown of Remediation Systems
	  	 	6-16	 
		  		  	6.9.4.	  	 Remediation System Access
	  	 	6-17	 
		  		  	6.9.5.	  	 Accidental Releases of Untreated Groundwater
	  	 	6-17	 
		  	 6.10.
	  	 Soil Management Protocols
	  	 	6-18	 
		  		  	6.10.1.	  	 Lead-Impacted Soil
	  	 	6-18	 
		  		  		  	 6.10.1.1.
	  	 Lead-Based Paint Survey
	  	 	6-19	 
		  		  		  	 6.10.1.2.
	  	 Initial Soil Lead Assessment
	  	 	6-19	 
		  		  		  	 6.10.1.3.
	  	 Excavation and Disposal of Lead-Impacted Soil
	  	 	6-21	 
		  		  	6.10.2.	  	 Excavated Soil Screening Procedures
	  	 	6-21	 
		  		  		  	 6.10.2.1.
	  	 Field Headspace Soil Screening Method
	  	 	6-23	 
		  		  		  	 6.10.2.2.
	  	 Notification of Soil Containing Chemicals and Impacted Soil
	  	 	6-23	 
		  		  		  	 6.10.2.3.
	  	 Documentation of Soil Screening & Management of Impacted Soils
	  	 	6-24	 
		  		  	 6.10.3.
	  	 Management of Impacted Excavated Soils
	  	 	6-25	 
		  		  	6.10.4.	  	 Soil Re-Use On-Site
	  	 	6-26	 
		  		  	6.10.5.	  	 Contingency Actions for the Observation, Investigation, and Removal of Unnaturally
Stained, Discolored, or Odorous Soil
	  	 	6-26	 
		  		  		  	 6.10.5.1.
	  	 Managing Soil Impacted by COPCs Other Than VOCs or TPH
	  	 	6-27	 
		  		  		  	 6.10.5.2.
	  	 Management of Impacted Soils After Construction Excavation is Complete
	  	 	6-27	 
		  		  		  	 6.10.5.3.
	  	 Documentation of Contingency Actions Taken
	  	 	6-32	 
			
	 7.
	  	 POST-CONSTRUCTION AND LONG-TERM RISK MANAGEMENT
	  	 	7-1	 
				
		  	7.1.	  	Property Manager and Tenant Notification	  	 	7-1	 

  
 iv 

 ENVIRONMENTAL ISSUES MANAGEMENT PLAN 

NASA Research Park 
 Santa Clara
County, California 
  

											
		  	7.2.	  	 Maintaining Planned Land Use
	  	 	7-2	 
				
		  	7.3.	  	 Prohibiting Use of Site Groundwater
	  	 	7-2	 
				
		  	7.4.	  	 Protocols for Future Subsurface Activities
	  	 	7-2	 
				
		  	7.5.	  	 Long-Term Compliance; Periodic Review and Update of EIMP
	  	 	7-3	 
		  		  	7.5.1.	  	 Evaluation of Groundwater Monitoring Data
	  	 	7-3	 
		  		  	7.5.2.	  	 Inspections/Maintenance/Monitoring
	  	 	7-3	 
			
	 8.
	  	 REFERENCES
	  	 	8-1	 

 LIST OF TABLES 
  

					
	1.	  	 Environmental Documents Supporting the Development of NASA Research Park
	  	
			
	2.	  	 Summary of Closure Plans
	  	
			
	3.	  	 Volatile Organic Compounds Detected in Groundwater
	  	
			
	4.	  	 Soil Target Concentration Levels for Polynuclear Aromatic Hydrocarbons (PAHs), Semi-Volatile
Organic Compounds (SVOCs), Polychlorinated Biphenyls, and Metals
	  	
			
	5.	  	 Soil Target Concentration Levels for Chlorinated VOCs, Petroleum Hydrocarbons, Benzene, Toluene,
Ethylbenzene, and Xylenes
	  	

  
 v 

 ENVIRONMENTAL ISSUES MANAGEMENT PLAN 

NASA Research Park 
 Santa Clara
County, California 
  

 LIST OF FIGURES 
  

					
	1.	  	 Site Location
	  	
			
	2.	  	 Planned Land Use and Environmental Baseline Survey Study Areas
	  	
			
	3.	  	 Installation Restoration Program Site Locations
	  	
			
	4.	  	 Trichloroethene Concentrations Detected in Groundwater (ug/L)
	  	
			
	5.	  	 Regional Groundwater Remediation Program Treatment System Layout
	  	
			
	6.	  	 TPH as Gasoline in Groundwater (ug/L), Approximate Concentration Contours
	  	
			
	7.	  	 Benzene Concentrations Detected in Groundwater (ug/L)
	  	
			
	8.	  	 Generalized Vapor Intrusion Process
	  	
			
	9.	  	 Vapor Intrusion Mitigation Area
	  	
			
	10.	  	 Generalized Layout of Sub-Slab Depressurization System
	  	
			
	11.	  	 Decision Diagram for Pre-Construction Planning of Potential Modifications to Remediation
Systems
	  	
			
	12.	  	 Decision Diagram for Management of Dewatering Water
	  	
			
	13.	  	 Decision Diagram for Management of Drums, Containers, Tanks, or Sumps
	  	
			
	14.	  	 Decision Diagram for Abandoned Pipe Management During Construction
	  	
			
	15.	  	 Decision Diagram for Remediation System Protection During Construction
	  	
			
	16.	  	 Decision Diagram for Management of Excavated Soil in MEW Allocation Area
	  	
			
	17.	  	 Decision Diagram for Management of Excavated Soil in Navy Allocation Area
	  	
			
	18.	  	 Decision Diagram for Management of Lead-Impacted Soil
	  	
			
	19.	  	 Decision Diagram for Unnaturally Stained, Discolored or Odorous Soil Management
	  	

  
 vi 

 ENVIRONMENTAL ISSUES MANAGEMENT PLAN 

NASA Research Park 
 Santa Clara
County, California 
  

 LIST OF APPENDICES 
  

	A.	MEW Companies/Navy/NASA Allocation Area Map 

  

	B.	Mitigated Alternative 5 Land Use Plan from Final Programmatic Environmental Impact Statement, prepared by DCE, July 2002 

  

	C.	Selected Plates from the Revised Human Health Risk Assessment, NASA Research Park, Moffett Field, California, prepared by Mactec, Inc., 28 July 2003 

 

	D.	Draft Agreement for Coordination of Construction and MEW Remedial System Modification Work at NASA Research Park, Ames Research Center, Moffett Field, California 

 

	E.	Draft Agreement for Coordination of Construction and Navy Remedial System Modification Work, NASA Research Park, Ames Research Center, Moffett Field, California 

  
 vii 

 ENVIRONMENTAL ISSUES MANAGEMENT PLAN 

NASA Research Park 
 Santa Clara
County, California 
  

 LIST OF ACRONYMS / ABBREVIATIONS 

 

			
	ACM	  	asbestos-containing materials
	ARC	  	Ames Research Center
	AST	  	aboveground storage tank
	BAAQMD	  	Bay Area Air Quality Management District
	bgs	  	below ground surface
	BMPs	  	best management practices
	BRAC	  	Base Realignment and Closure
	BTEX	  	benzene, toluene, ethylbenzene and xylenes
	Cal/EPA	  	California Environmental Protection Agency
	CBC	  	California Building Code
	CDF	  	controlled density fill
	CERCLA	  	Comprehensive Environmental Response, Compensation, and Liability Act
	cis-1,2-DCE	  	cis-1,2-dichloroethene
	COPC	  	chemical of potential concern
	CTE	  	Central Tendency Estimate
	CWMI	  	Chemical Waste Management, Inc.
	1,1-DCA	  	1,1-dichloroethane
	1,2-DCA	  	1,2-dichloroethane
	1,1-DCE	  	1,1-dichloroethene
	DERP	  	Defense Environmental Restoration Program
	DHS	  	Department of Health Services
	DMJM	  	Daniel, Mann, Johnson, & Mendenhall
	DoN	  	Department of the Navy
	DTSC	  	Department of Toxic Substances Control
	EBS	  	Environmental Baseline Survey
	EIMP	  	Environmental Issues Management Plan
	EIS	  	Environmental Impact Statement
	EKI	  	Erler & Kalinowski, Inc.
	ESL	  	Environmental Screening Level
	FFA	  	Federal Facility Agreement
	FID	  	flame-ionization detector
	GAC	  	granular activated carbon
	GWTS	  	groundwater treatment system
	Harding	  	Harding ESE, Inc.
	hazwoper	  	hazardous waste site operations
	HDPE	  	high-density polyethylene
	HHRA	  	human health risk assessment
	HI	  	Hazard Index
	H&SP	  	health and safety plan
	IRP	  	Installation Restoration Program
	LCM	  	lead-containing material
	LTA	  	lighter-than-air
	Mactec	  	Mactec, Inc.
	MCL	  	maximum contaminant level
	MEW	  	Middlefield-Ellis-Whisman
	MFA	  	Moffett Federal Airfield
	mg/kg	  	milligrams per kilogram
	NADP EIS	  	NASA Ames Development Plan Environmental Impact Statement
	NASA	  	National Aeronautics and Space Administration

  
 viii 

 ENVIRONMENTAL ISSUES MANAGEMENT PLAN 

NASA Research Park 
 Santa Clara
County, California 
  

			
	NAS Moffett Field	  	Naval Air Station Moffett Field
	NEX service station	  	Naval Exchange Gasoline Service Station
	NPDES	  	National Pollutant Discharge Elimination System
	NPL	  	National Priorities List
	NRP	  	NASA Research Park
	OVA	  	organic vapor analyzer
	PCB	  	Polychlorinated biphenyl
	PCE	  	tetrachloroethene
	PEL	  	Permissible Exposure Limit
	PID	  	photo-ionization detector
	POTW	  	Publicly-Owned Treatment Works
	ppb	  	parts per billion
	PPE	  	personal protective equipment
	ppm	  	parts per million
	ppmv	  	parts per million by volume
	PPV	  	positive-pressure ventilation
	PRG	  	Preliminary Remediation Goal
	QSI	  	Quantum Services Inc.
	RBCA	  	risk-based corrective action
	RBSL	  	risk-based screening levels
	RI/FS	  	Remedial Investigation/Feasibility Study
	RME	  	Reasonable Maximum Exposure
	ROD	  	Record of Decision
	RWQCB	  	California Regional Water Quality Control Board, San Francisco Bay Region
	SCCEHD	  	Santa Clara County Environmental Health Department
	SCVWD	  	Santa Clara Valley Water District
	Site	  	213-acre parcel that was formerly part of Naval Air Station Moffett Field in Santa Clara County, California
	SMD	  	sub-membrane depressurization
	SSD	  	sub-slab depressurization
	STLC	  	Soluble Threshold Limit Concentration
	SVOC	  	semi-volatile organic compound
	SWPPP	  	Storm Water Pollution Prevention Plan
	SWRCB	  	State Water Resources Control Board
	1,1,1-TCA	  	1,1,1-trichloroethane
	TCE	  	trichloroethene
	TCL	  	target concentration level
	TCRA	  	Time-Critical Removal Action
	TPH	  	total petroleum hydrocarbons
	TPHd	  	total petroleum hydrocarbons as diesel
	TPHg	  	total petroleum hydrocarbons as gasoline
	TPH-e	  	extractable total petroleum hydrocarbons
	TPH-p	  	purge able total petroleum hydrocarbons
	TSCA	  	Toxic Substances Control Act
	TTO	  	total toxic organics
	trans-1,2-DCE	  	trans-1,2-dichloroethene
	TTLC	  	Total Threshold Limit Concentration
	ug/L	  	micrograms per liter
	ug/m3	  	micrograms per cubic meter
	U.S. EPA	  	U.S. Environmental Protection Agency

  
 ix 

 ENVIRONMENTAL ISSUES MANAGEMENT PLAN 

NASA Research Park 
 Santa Clara
County, California 
  

			
	UST	  	underground storage tank
	VOC	  	volatile organic compound
	WATSL	  	West-Side Aquifers Treatment System
	Weston	  	Roy F. Weston
	WET	  	Waste Extraction Test

  
 x 

 EXECUTIVE SUMMARY 

The National Aeronautics and Space Administration (“NASA”) plans to develop a world- class collaborative research and educational campus at the NASA
Research Park (“NRP”), a 213-acre parcel that was formerly part of Naval Air Station Moffett Field in Santa Clara County, California (“Site”; Figure 1). Soil and groundwater quality at the NRP have been impacted by the historical
use of the Site by the Navy, as well as by the migration of groundwater containing chlorinated volatile organic compounds (“VOCs”) from the upgradient Middlefield-Ellis-Whisman (“MEW”) Superfund Site located south of the NRP in
the City of Mountain View. To manage the planned redevelopment of the NRP, NASA intends to partner with one or more organizations that have expertise with building rehabilitation and development. 

This Environmental Issues Management Plan (“EIMP”) provides a decision framework for the management of residual chemicals in soil and groundwater at
the Site during development. The EIMP is intended to describe procedures to address the known remaining environmental conditions at the Site, as well as contingency actions to be taken in the event that previously unknown environmental conditions
are encountered during development of the NRP. The EIMP will be provided to the U.S. Environmental Protection Agency (“U.S. EPA”) and the California Regional Water Quality Control Board, San Francisco Bay Region (“RWQCB”) as lead
agencies for the Site, and other involved regulatory agencies with oversight authority to obtain regulatory approval of the measures to be taken during Site development to address Site environmental conditions. By obtaining regulatory pre-approval
of procedures to be followed if impacted soil and groundwater are encountered during Site development activities, the potential for delays due to environmental conditions can be reduced. 

The EIMP provides a baseline of minimum design considerations for new construction, risk management measures to be implemented during construction at the
Site, post-construction risk management procedures for future subsurface activities at the Site, as well as procedures for long-term compliance with this EIMP. All NASA partners, tenants, project developers and other entities with responsibility for
Site activities shall have the independent obligation to: 1) review available information concerning Site environmental conditions; 2) determine the adequacy of this EIMP with respect to the expected Site conditions and the intended land use, as
well as the conditions actually encountered during Site development; 3) establish management procedures to ensure that risk management measures are properly implemented and maintained; 4) comply with applicable policies, laws and regulations; and 5)
evaluate the current understanding of the health effects of identified chemicals of potential concern (“COPCs”), to the extent the understanding of health effects assumed in this EIMP may change. 

Existing Environmental Conditions 
 Numerous potential
source areas have been investigated and remediated within the NRP area, primarily releases associated with underground storage tanks (“USTs”) and sumps that contained petroleum hydrocarbon products, although several source areas of
chlorinated VOC contamination have also been investigated and remediated by the Navy. 
 A large regional plume of chlorinated VOCs underlies most of the
NRP area. The source of this contamination is migration of contaminated groundwater from the upgradient MEW Superfund 

  
 ES-1 

 
Site that has commingled with groundwater contamination from chlorinated solvent sources locked within the NRP area. In addition, petroleum hydrocarbons and fuel-related constituents, such as
benzene, toluene, ethylbenzene and xylene (“BTEX”), from sources at Moffett Field have also impacted Site groundwater. Both the Navy and the companies remediating the MEW Superfund site (“MEW Companies”) have installed and are
operating groundwater remediation systems within the NRP area. 
 As a result of investigations that were performed at the Site, the identified
environmental conditions and primary COPCs that need to be considered during redevelopment are: 
  

	 	•	 	the presence of chlorinated VOCs in Site groundwater and in Site soil; 

  

	 	•	 	the presence of total petroleum hydrocarbons and other fuel-related constituents, including BTEX compounds, in Site groundwater and in Site soil; 

 

	 	•	 	the presence of elevated concentrations of polychlorinated biphenyls (“PCBs”) in soil surrounding buildings; and 

  

	 	•	 	the presence of elevated concentrations of lead in soil surrounding buildings. 

 Other site conditions that
must be considered during redevelopment include existing subsurface structures (e.g., sumps or tanks) that need to be removed and hazardous materials associated with existing buildings (e.g., asbestos-containing materials). 

Human Health Risk Assessment 
 Mactec, Inc.
(“Mactec”) prepared a Human Health Risk Assessment (“HHRA”), dated 28 July 2003, to evaluate potential human health effects from possible exposure to hazardous chemicals in groundwater and air at the Site (Mactec, 2003b).
Based on NASA’s planned land use for the NRP area, potential future receptors identified in the HHRA include (a) construction workers; (b) indoor workers, such as researchers, teachers, office personnel; and (c) adult and child residents in
housing provided for students or employees and their families. For the adult and child residents, exposures were assessed in two ways, i.e., assuming a typical 5- to 10-year residence at the Site, and assuming a 30-year residence at the Site, which
is consistent with default exposure parameters in U.S. EPA risk assessment guidance. 
 Potential future receptors may be exposed to COPCs by one or more of
the following pathways: 
  

	 	•	 	inhalation of volatile chemicals from groundwater or soil; 

  

	 	•	 	dermal absorption due to direct soil and/or groundwater contact; 

  

	 	•	 	inhalation of airborne suspended soil particulates; and 

  

	 	•	 	incidental soil ingestion. 

 To provide a range of risk estimates, two types of exposure scenarios were used in
the HHRA, i.e., a reasonable maximum exposure (“RME”) and a central tendency exposure (“CTE”). The 

  
 ES-2 

 
RME, as defined by U.S. EPA (1989b), is the “highest exposure that is reasonably expected to occur” and is estimated using a combination of average and upper-bound values of human
exposure parameters. The CTE provides an estimate for exposure at a site by the use of average or site-related exposure parameters (Mactec, 2003b). 

Groundwater is the primary contaminated medium of concern at the Site. Exposure to chemicals in the groundwater is primarily the result of transport of VOC
vapors from the groundwater to the ground surface. Once at the surface, these VOC vapors enter the outdoor atmosphere or can infiltrate the indoor building environment. The risks resulting from potential exposure to VOC vapors were calculated using
both groundwater quality data and air quality data (Mactec, 2003b). 
 For each receptor population, estimated human health risks were calculated (a) for
each of the 90 groundwater sampling locations in the upper aquifer at the Site, based on chemical concentrations detected in groundwater samples collected from each well, and (b) for each of 14 existing buildings, based on chemical concentrations
detected in air samples collected inside and outside each building. The calculated human health risks for indoor workers and residents are shown in Appendix C on selected figures from the HHRA (Mactec, 2003b). Each figure presents the estimated
human health risk for each groundwater sampling location and each building for which risks were calculated. Contours are drawn on each figure to indicate how estimated human health risks based on groundwater data vary spatially across the Site. 

Human health risks are expressed as either (a) an incremental lifetime excess cancer risk or (b) a Hazard Index (“HI”) for non-cancer adverse health
affects. Based on U.S. EPA guidance, cancer risks are compared in the HHRA to a risk management range of 10-6 (one-in-a-million) to 10-4
(one-in-ten-thousand), and the non-cancer HI is compared to a threshold level of 1.0, a level below which there are unlikely to be adverse health affects, even for sensitive populations (Mactec, 2003b). 

For the purpose of developing this EIMP, conclusions from the HHRA can be summarized as follows: 

 

	 	•	 	for future building occupants at the Site, results from the HHRA indicate that VOC vapors may potentially migrate from groundwater to indoor air inside buildings at levels of concern, a process called “vapor
intrusion”; and 

  

	 	•	 	for construction workers, direct contact with groundwater containing VOCs results in estimated cancer risks and non-cancer hazards at levels of concern. . 

As discussed below, measures described in the EIMP are intended to address the calculated risks such that human health is protected during and after
development of the NRP. 
 Soil Target Concentration Levels 

Soil target concentration levels (“TCLs”) have been developed for the NRP. The soil TCLs will be used to determine (a) whether excavated soil can be
reused as fill at the NRP and (b) whether additional soil removal should be considered at locations where potential soil contamination is observed during development. 

  
 ES-3 

 Soil TCLs have been derived for COPCs that have been detected in soil from the NRP as summarized below and listed
in Tables 4 and 5. 
  

	 	•	 	For chlorinated VOCs, the soil cleanup levels set in the MEW Record of Decision (“ROD”) (U.S. EPA, 1989a) will be used as TCLs for the NRP. 

 

	 	•	 	For petroleum hydrocarbons and BTEX, the cleanup levels for petroleum contamination in soil at Moffett Federal Airfield (“MFA”) negotiated by the Navy and State of California in 1994 (Tetra Tech, 1998b) will
be used as TCLs for the NRP. 

  

	 	•	 	For PCBs, the soil TCL will be 1 mg/kg as established by the DTSC for the NASA Ames Research Center (Cal/EPA, 1998) and consistent with the PCBs cleanup level promulgated in Toxic Substances Control Act
(“TSCA”) regulations (40 CFR §761) for high occupancy areas. 

  

	 	•	 	For metals, the soil TCL will be the lower value from (a) Environmental Screening Levels (“ESLs”) for residential soils to account for potential dermal contact or incidental soil ingestion (RWQCB, 2003) or (b)
U.S. EPA Preliminary Remediation Goals (“PRGs”) for residential soil (U.S. EPA, 2002a) unless that value is less than (c) “background” concentrations for metals in soil (Mactec, 2003b), in which case the soil TCL will be the
“background” value. 

  

	 	•	 	For other COPCs, the lowest value from the ESLs and PRGs (see above) will be used as TCLs for the NRP. 

 Soil
managed during development of the NRP will be managed to meet TCLs. 
 Risk Goals for NRP 

During and after development of the NRP, NASA’s goal is to achieve an estimated cumulative lifetime excess cancer risk from vapor intrusion and direct
contact with groundwater of less than 1x10-6 and HI of less than 1 for all receptors (i.e., construction workers, indoor workers and residents) using the RME exposure parameters. Measures for
achieving these goals are discussed in Sections 5, 6 and 7 of the EIMP. 
 Risk Management Design Considerations for New Construction 

Measures to Reduce Potential Exposure to VOCs in Indoor Air 

The HHRA illustrates that COPCs in groundwater at the Site can potentially result in human health risks above NASA’s risk goals in indoor air through
vapor intrusion. The estimated cancer risks in indoor air that can be attributed to vapor intrusion from COPCs in groundwater result primarily from TCE. As such, and in consideration of vapor intrusion guidance from the U.S. EPA, this EIMP requires
vapor intrusion be implemented for buildings constructed over areas of the Site where the TCE concentration in groundwater exceeds 5 micrograms per liter (“ug/L”). The area of the Site where the TCE concentration in groundwater is believed
to exceed 5 ug/L, based on available groundwater monitoring data, is shown on Figure 9. This area generally encompasses the areas at the Site where cancer risk were estimated in the HHRA to exceed
10-6 for one or more populations. See Section 5.1.2.1 in this EIMP for further discussion of the 5 ug/L TCE criterion for designating areas as requiring vapor intrusion mitigation. 

  
 ES-4 

 See Section 5.1.3.7 in this EIMP for discussion of addressing the potential for vapor intrusion into existing
buildings. 
 Within the area shown on Figure 9, the primary method of vapor intrusion mitigation at individual buildings will include either: 

 

	 	•	 	active sub-slab depressurization (“SSD”); 

  

	 	•	 	continuous interior positive-pressure ventilation (“PPV”); 

  

	 	•	 	ground level open-air or mechanically-ventilated parking garages beneath all occupied spaces; or 

  

	 	•	 	sub-membrane depressurization (“SMD”) for buildings constructed over a crawl space. 

 Vapor intrusion
occurs when soil vapors are drawn into building interiors by a lower air pressure inside the building as compared to the pressure in the soil pores beneath the building. Both active SSD and continuous PPV are designed to effectively prevent vapor
intrusion by reversing airflow, i.e., instead of soil gases being drawn inward into building interiors through cracks, indoor air would flow outward from the building to the subsurface. Active SSD involves continuously withdrawing air from beneath
the lowest floor of the building to create a slight vacuum beneath the floor. Continuous PPV involves designing and operating the building’s mechanical ventilation system to continuously maintain a slightly higher air pressure inside the lowest
level of the building, as compared to outside the building, and operating that system 24 hours per day. 
 In lieu of active SSD or continuous PPV, vapor
intrusion mitigation may be implemented by constructing an open-air or mechanically ventilated parking garage on the lowest level of the structure. Vapor intrusion is mitigated in such instances by (a) reducing the pressure driving force for soil
vapors to migrate into the lowest level and (b) high ventilation rates in parking garages that reduce the concentration of COPCs in air to a higher degree than in typical office or residential construction. 

In addition to the primary vapor intrusion mitigation techniques described above, cracks in the concrete floors in buildings at the Site will be minimized
through proper design and installation of the floor and use of sealants around cracks and utility penetrations in the floor. 
 Vapor intrusion mitigation
for buildings inside the area shown on Figure 9 is not required as described above if the developer can demonstrate for a specific building (a) that an alternative design would meet NASA’s Risk Goals for the NRP or (b) that additional site
characterization demonstrates that the existing risks meet NASA’s risk goals. Such demonstrations will require written approval by NASA and U.S. EPA. 

  
 ES-5 

 Measures to Mitigate Groundwater Movement 

Due to the groundwater contamination in the aquifer underlying the NRP, measures must be taken to prevent new construction from creating potential pathways for
migration of COPCs in groundwater. Utility lines installed in trenches or horizontal boreholes in areas where contaminated groundwater could potentially flow through utility line backfill material must include the use of low permeability backfill or
cutoff walls to reduce potential contaminant migration. Similarly, if new construction requires piles that extend to depths greater than 20 feet (i.e., potentially below the shallow aquifer impacted by COPCs), mitigation measures must be included in
their design to reduce the potential for driving impacted soil deeper or creating conduits for groundwater migration. In both situations, the project developer will prepare a design report for review by NASA (and for Santa Clara Valley Water
District review in the case of construction piles) describing the measures that will be taken and demonstrating their effectiveness in preventing potential migration of COPCs. 

Both the Navy and MEW Companies currently operate groundwater remediation systems in the NRP area. These systems are required to be continuously operating,
and therefore, close coordination between the project developers, the Navy and the MEW Companies must occur during the design and construction phase of Site development to ensure that measures are taken to protect the existing remediation systems
during construction. NASA will facilitate this coordination. Procedures have been developed to allow for the modification of the existing remediation systems if potential conflicts occur between the planned development and the location of the
existing systems. Any such modifications are subject to approval by U.S. EPA, the RWQCB, and either the MEW Companies or the Navy. The cost of implementing any necessary system modifications will be the responsibility of the project developer. 

Risk Management During Construction 
 This EIMP summarizes
risk management measures to be implemented during construction to mitigate potential risks to human health and the environment from COPCs. These measures include: 
  

	 	•	 	development and implementation of a Site-specific health and safety plan (“H&SP”) that describes health and safety training requirements for on-Site workers, personal protective equipment to be used, and
other precautions to be undertaken to minimize direct contact with soil and groundwater; 

  

	 	•	 	implementation of construction impact mitigation measures, such as implementing dust and odor control measures, decontaminating construction and transportation equipment, implementing storm water pollution controls, and
sampling and analyzing groundwater extracted during construction to determine appropriate storage and disposal practices; 

  

	 	•	 	proper management of asbestos-containing material (“ACM”); debris containing lead-based paint and/or PCB-containing paint; and PCB-containing equipment that is removed during Site development;

  
 ES-6 

	 	•	 	procedures for the management of abandoned USTs, sumps, pipes, and buried drums or containers that may be encountered during Site development activities; 

 

	 	•	 	procedures for protecting the existing groundwater remediation systems during Site development activities and implementing any approved modifications to the existing systems; and 

 

	 	•	 	procedures for the management of soil potentially impacted by COPCs that is handled during construction activities. The soil management protocols include screening procedures to identify and manage COPC-impacted soil
that is excavated during Site development, as well as contingency procedures to be followed in the event that previously unknown soil contamination is encountered. 

In general, NASA intends to conduct necessary environmental sampling and screening of soil and groundwater during Site development; however, in some cases,
based on project needs and schedule or staffing constraints, the project developer’s contractor may conduct such sampling with NASA’s approval and under NASA’s oversight. The project developer is responsible for the necessary
excavation or removal of potentially impacted soil or groundwater during construction, as well as subsurface structures, such as USTs that are encountered during construction excavation. 

Contaminated groundwater produced during dewatering of excavations will be either discharged to the sanitary sewer (if a discharge permit can be obtained) or
transported by the developer to the Navy or MEW Companies’ on-Site groundwater treatment system (depending on the area of the excavation and the COPCs detected in groundwater). The Navy or MEW Companies will be responsible for the proper
treatment and disposal of the contaminated groundwater. 
 Similarly, contaminated soil excavated by the developer will be transported by the developer to
either the Navy or MEW Companies on-Site soil treatment pad. The Navy or MEW Companies will be responsible for the proper treatment or off-Site disposal of the impacted soil. NASA is currently in discussions with the Navy on how contaminated soil or
other waste that is the Navy’s responsibility will be handled. Under the potential agreement, NASA will monitor and operate the Navy’s soil treatment pad at the Navy’s expense. In addition, where necessary, NASA will arrange for any
necessary off-Site disposal of soil or other waste (USTs) at the Navy’s expense. 
 Post-Construction Risk Management 

The EIMP also describes precautions that will be implemented by NASA, the NASA Partners, project developers and tenants (i.e., the “interested
parties”) to mitigate long- term risks to human health and the environment related to potential exposure to COPCs during periods of normal non-construction activity. These precautions include: 

 

	 	•	 	NASA, the NASA Partners, and project developers providing appropriate notification to future property managers and tenants of the known environmental conditions at the Site and the requirements of the EIMP;

  
 ES-7 

	 	•	 	NASA and the NASA Partners conducting additional risk analysis and modification of the EIMP, as appropriate, if there is any significant change in land use proposed for the NRP or if any significant change in toxicity
values for COPCs occurs;. 

  

	 	•	 	The interested parties ensuring that groundwater from the Site is not used for drinking water or any other purpose unless its use is approved by NASA, the U.S. EPA, the RWQCB, and the Santa Clara Valley Water District;
an exception is that treated groundwater may be used for irrigation and/or industrial heating or cooling or other processes, as approved by NASA; 

  

	 	•	 	The interested parties following site health and safety procedures similar to the procedures described for Site construction for activities that disturb subsurface Site soil (e.g., utility repairs). In addition, other
appropriate procedures developed for construction activities (e.g., soil management) shall also be followed; 

  

	 	•	 	The NASA Partners, project developers, and tenants conducting appropriate ongoing operation and maintenance to verify the continued adequacy of risk management measures, such as vapor intrusion mitigation measures, and
evaluating ongoing environmental monitoring data (e.g., groundwater monitoring data) to determine if there are any significant changes in Site environmental conditions that require potential modification of this EIMP; and 

 

	 	•	 	NASA and the NASA Partners monitoring changes in COPC toxicity parameters to assess if additional or lesser mitigation may be needed based on an updated understanding of chemical toxicity of the COPCs at the NRP.

 In accordance with guidelines to be provided by NASA in the future, an annual report will be prepared by NASA’s Partners summarizing
and evaluating the results of the inspection/maintenance/monitoring activities and documenting the continued adequacy of the implemented risk management measures. NASA will update the EIMP, on a schedule as deemed appropriate by NASA, based upon:

  

	 	•	 	information from the annual reports to be provided by the project developers; 

  

	 	•	 	information regarding any intended changes in land use; and 

  

	 	•	 	future available information regarding the potential health effects of COPCs. 

  
 ES-8 

 1. INTRODUCTION 

This Environmental Issues Management Plan (“EIMP”) is intended to address the known remaining environmental conditions at the NASA Research Park
(“NRP”), a 213-acre parcel that was formerly part of Naval Air Station (“NAS”) Moffett Field in Santa Clara County, California (Figure 1) (“Site”). The National Aeronautics and Space Administration (“NASA”)
intends to redevelop the Site, with various public and private partners, as a collaborative research and educational campus. In addition to addressing known environmental conditions, the Environmental Issues Management Plan also describes
contingency actions to be taken in the event that previously unknown environmental conditions are encountered during development of the NRP. 
 The
Environmental Issues Management Plan provides a decision framework to manage residual chemicals in soil and groundwater at the Site in a manner that is (a) satisfactory to the U.S. Environmental Protection Agency (“U.S. EPA”) and the
California Regional Water Quality Control Board, San Francisco Bay Region (“RWQCB”) as lead agencies, and other involved regulatory agencies with oversight authority, (b) protective of human health and the environment, and (c) consistent
with planned future land uses. This Environmental Issues Management Plan contains the following: 
  

	 	•	 	a description of the Site background, including a brief history of Site usage and a brief summary of identified remaining environmental conditions (Section 2); 

 

	 	•	 	a brief description of current and planned land use within the NRP area (Section 3); 

  

	 	•	 	a summary of the risk assessment for the NRP that was conducted by Mactec, Inc. (“Mactec”), formerly Harding ESE, Inc., to evaluate potential human health and environmental impacts from the Site, and a summary
of soil target concentration levels (“TCLs”) (Section 4); 

  

	 	•	 	a description of risk management measures to be considered during design for new construction planned at the Site (Section 5); 

  

	 	•	 	a description of short-term risk management protocols to be implemented during construction at the Site, which includes worker health and safety planning requirements, construction impact mitigation measures, and soil
management protocols (Section 6); and 

  

	 	•	 	a description of post-construction risk management protocols for mitigation of any long-term risks to human health and the environment, which includes protocols for future subsurface activities at the Site, and
procedures to ensure long-term compliance with this Environmental Issues Management Plan (Section 7). 

  

	1.1.	Representations 

 The risk management protocols specified in this Environmental Issues Management Plan
are based on a current understanding of Site environmental conditions and current policies, laws, and regulations. No representation is made as to the applicability of this Environmental Issues Management Plan with respect to future Site conditions,
as conditions may change or new information may become available. 

  
 1-1 

 This report is based solely on data and documentation provided by the Government (NASA) with regard to the
existing environmental condition of the project site. The accuracy of this information has been assumed in the preparation of this report. Information and opinions contained herein are preliminary and are for use only in further site planning. The
provider of this report disclaims any responsibility for any unintended or unauthorized use of this report. Site testing, test evaluation, and further site investigations are necessary to calculate human health risks and to establish the specific
procedures for remediation or containment of hazardous substances on the project site. 
 Quantum Services Inc. (“QSI”); DMJM; and Erler &
Kalinowski, Inc. (“EKI”) shall have no responsibility for the discovery, presence, handling, removal, disposal or exposure of persons to hazardous materials in any form at the Project site. Hazardous materials are deemed to include, but
not be limited to: petroleum products, asbestos, asbestos- containing products, polychlorinated biphenyl (“PCBs”), and any other substances identified as hazardous or toxic by the U.S. EPA or the California Environmental Protection Agency
(“Cal/EPA”). 
  

	1.2.	Responsibilities 

 All NASA partners, tenants, project developers, and other entities with responsibility
for Site activities shall have a continuing obligation to: 
  

	 	•	 	determine the adequacy of this Environmental Issues Management Plan in light of the conditions actually encountered and the intended land use; 

 

	 	•	 	evaluate the current understanding of the health effects of identified chemicals of potential concern (“COPCs”), to the extent information about health effects assumed in this Environmental Issues Management
Plan may change; 

  

	 	•	 	comply with applicable policies, laws, and regulations; 

  

	 	•	 	establish management procedures for inspection, maintenance, and monitoring of the risk management measures that are implemented and to establish protocols for future sub-surface activity to ensure long-term compliance
with the Environmental Issues Management Plan; and 

  

	 	•	 	be responsible for assuring that the Environmental Issues Management Plan is reviewed by qualified environmental professionals and modified periodically, as necessary, to address significant changes in environmental
conditions, land uses and/or applicable laws and regulations. 

  
 1-2 

 2. SITE BACKGROUND 

 

	2.1.	Site Setting 

 The NRP (Figure 1) is a 213-acre property that is located in the southwestern portion of
NASA Ames Research Center (“ARC”). ARC is located in Santa Clara County, California, approximately 35 miles south of San Francisco and 10 miles north of San Jose. To the north and west of the NRP lie the Ames Campus and Bayview Areas; to
the south is U.S. Highway 101 and the City of Mountain View; and to the east are the runways and hangars of the Eastside Airfield. 
 ARC is located near
the southwestern edge of San Francisco Bay on nearly flat fluvial basin deposits. The elevation of ARC ranges from approximately 36 feet above mean sea level to 2 feet below mean sea level (IT,1993a). The predominant surface features are man-made
structures including buildings, hangars, roads, parking lots, and landscaped areas. 
 The areas just north of ARC were previously tidal salt marshes and
mud flats of San Francisco Bay. However, these marshes and mud flats have been eliminated or greatly altered by diking and filling (IT,1993a). Currently, stormwater retention ponds separated by roads and levees and former saltwater evaporation ponds
are present north of ARC. The former saltwater evaporation ponds have been transferred to the U.S. Fish & Wildlife Service for restoration. 
 There are
no streams on ARC, although several streams are present to the east (Coyote Creek and Guadalupe Slough) and to the west (Stevens Creek). Surface water features include stormwater drainage ditches, several small ponds, seasonal marshes, and
stormwater retention ponds (PRC, 1996). 
 For discussion of current and proposed future land uses, see Sections 3.1 and 3.2. 

 

	 	2.1.1.	Hydrogeology 

 The Santa Clara Valley Basin is a large, northwest trending structural depression between
the San Andreas and Hayward faults. The valley is bordered on the west by the Santa Cruz Mountains and on the east by the Diablo Range. Regionally, the Santa Clara Valley contains up to 1,500 feet of interbedded alluvial, fluvial, and estuarine
deposits (Tetra Tech,1998a). 
 The shallow aquifer (upper 250 feet) is subdivided into the A, B, and C aquifers. The A aquifer consists of sands and
gravels found between depths of approximately 5 and 60 feet below ground surface (“bgs”). It is divided into the Al- and A2- aquifer zones by a discontinuous low-permeability horizon (A1/A2 aquitard) located between approximately 25 and 30
feet (Tetra Tech, ). In general, the groundwater flow direction in the A aquifer is toward San Francisco Bay (north) with a horizontal gradient of 0.004 to 0.005 feet per foot (ft/ft). Vertical gradients between the Al- and A2- aquifer zones are
weak and locally variable. Depth to groundwater ranges from 5 to 12 feet bgs (Tetra Tech, 1998a). 
 The A/B aquitard is a 5-7 foot thick clay zone
encountered between the depths of approximately 65 to 70 feet bgs and may be locally continuous under the western portion of ARC (PRC, 1996). The B aquifer (70-120 feet bgs) includes permeable deposits characterized by interbedded fine- to
medium-grained sands, and clayey sands. Significant upward vertical gradients exist between the B aquifer and the overlying A2-aquifer in the ARC. A laterally extensive clay aquitard (B/C aquitard) effectively isolates the C aquifer (160 to 250 feet
below ground surface) (Tetra Tech, 1998a). 

  
 2-1 

 The MEW Companies interpret the hydrogeology of the Site differently from the description above. Specifically,
they refer to the A2-aquifer zone as the B1-aquifer zone and thus interpret the B aquifer as extending from approximately 30 to 120 feet bgs. 
  

	2.2.	Site History 

 The former Naval Air Station (“NAS”) Moffett Field was used for agriculture
since the 19th century until it was commissioned as Sunnyvale Naval Air Station in 1933. The station was operated continuously by the U.S. Military until it was transferred to NASA on 1 July 1994. It was transferred from the Navy to the Army
Air Corps for use as a training base in 1935, but was returned to Navy control. 
 The original mission of the naval air station was to serve as a base for
the West Coast dirigibles of the lighter-than-air program (“LTA”). By 1950 when jet aircraft were introduced, NAS Moffett Field was the largest naval air transport base on the West Coast and became the first all-weather NAS. Between 1973
and 1994, the mission of NAS Moffett Field was to support anti-submarine warfare training and patrol squadrons (PRC, 1996). No heavy manufacturing or major aircraft maintenance was conducted during this last period of operation of NAS Moffett Field,
although some maintenance activity occurred (Harding, 2000a). 
 In 1991, NAS Moffett Field was designated for closure as an active military base under the
Department of Defense Base Realignment and Closure (“BRAC”) Program. Except for military housing units and associated facilities that were transferred to Onizuka Air Force Base and an off-site area (NAVAIR manor) that was sold to the City
of Sunnyvale, NAS Moffett Field was transferred to NASA in 1994 and renamed Moffett Federal Airfield (“MFA”) (PRC, 1996). Following publication of the NASA Ames Development Plan Environmental Impact Statement (“EIS”) and
subsequent signing of the Record of Decision (“ROD”), MFA was renamed NRP and Eastside Airfield. 
  

	2.3.	Summary of Known Site Environmental Conditions and Potential Chemicals of Concern 

 Site investigations,
removal actions, and remedial actions have been implemented at former NAS Moffett Field since 1984. A brief summary of site investigations and remedial actions that have been conducted in the NRP area is included in Section 2.4. 

The following is a list of types of potential COPCs that have been detected in soil or groundwater samples within the NRP area at least once above background
levels: 
  

	 	•	 	volatile organic compounds (“VOCs”); 

  

	 	•	 	purgeable and extractable total petroleum hydrocarbons (“TPH”); 

  

	 	•	 	benzene, ethylbenzene, toluene, and xylenes (“BTEX”); 

  
 2-2 

	 	•	 	semi-volatile organic compounds (“SVOCs”); 

  

	 	•	 	polychlorinated biphenyls (“PCBs”) and 

  

	 	•	 	metals 

 As a result of investigations that were performed at the Site, the identified environmental conditions
and primary COPCs that need to be considered during redevelopment are: 
  

	 	•	 	the presence of chlorinated VOCs in Site groundwater and in Site soil; 

  

	 	•	 	the presence of total petroleum hydrocarbons and other fuel-related constituents, including BTEX in Site groundwater and in Site soil above and below the groundwater table; 

 

	 	•	 	the presence of elevated concentrations of PCBs in soil surrounding buildings; and 

  

	 	•	 	the presence of elevated concentrations of lead in soil surrounding buildings. 

 In addition to the primary
COPCs, previous site investigations have also detected low levels of certain SVOCs, including bis(2-ethylhexyl)phthalate, naphthalene and 2-methylnaphthalene in Site soil or groundwater within the NRP area; however, these chemicals are generally
present in concentrations below U.S. EPA Region IX Preliminary Remediation Goals (“PRGs”) for residential or industrial/commercial land use (U.S. EPA, 2002a). Metals have also been detected in Site soils; soil metal concentrations have
generally been within expected background concentrations or slightly elevated above expected background concentrations (with the exception of lead as ● described above and in Section 2.4.6), but below U.S. EPA PRGs. PCBs have also been
detected in site soils (PAI/ISSI Team, 2001b). 
 A large regional plume of chlorinated VOCs underlies most of the NRP area. The source of this
contamination is migration of contaminated groundwater from the upgradient MEW Superfund Site (see Section 2.4.3) that has commingled with groundwater contamination from chlorinated solvent sources located at the former NAS Moffett Field. In
addition, petroleum hydrocarbons and fuel-related constituents, such as BTEX compounds, from sources at Moffett Field have also impacted Site groundwater. The commingled regional plume of VOC and fuel-related groundwater contamination found within
the NRP and remedial actions that have been taken to address this are described in Section 2.4.3. 
 Numerous potential source areas have been investigated
and remediated within the NRP area, primarily releases associated with underground storage tanks and sumps that contained petroleum hydrocarbon products, although several source areas of chlorinated VOC contamination have also been investigated and
remediated. Sections 2.4.4 and 2.4.5 summarize the investigations and remedial actions that have been conducted in potential source areas and residual concentrations of COPCs that have been detected in soil. 

Three investigations of lead in soil surrounding buildings have been conducted within the NRP area. Elevated concentrations of lead were detected in shallow
soil surrounding a number of buildings in the NRP area. The results of these surveys of lead in soil surrounding existing buildings are summarized in Section 2.4.6. 

  
 2-3 

 Other site conditions that must be considered during redevelopment, such as existing subsurface structures (e.g.,
sumps or tanks) or hazardous materials associated with existing buildings (e.g., asbestos-containing materials), are summarized in Sections 2.5 and 2.6. Existing subsurface structures that may need to be removed are described in Section 2.5, while
Section 2.6 summarizes hazardous materials associated with existing buildings or operations. 
  

	2.4.	Summary of Site Investigations and Remedial Actions 

 This section summarizes the site investigations and
remedial actions that have been conducted within the NRP. This summary is provided only for information purposes. The project developer should review original source documents and data as part of its own assessment and evaluation of expected site
conditions during site development activities. Available documents are described in Section 2.4.1. 
  

	 	2.4.1.	Available Documents 

 Numerous investigations of soil and groundwater conditions have occurred at the NRP
and are summarized in various technical memoranda, remedial investigation and feasibility study reports and other documents. A list of documents reviewed is provided in Section 8. Table 1 summarizes documents prepared during 2000 through 2003 that
may be of particular interest to future users of the NRP Area. 
  

	 	2.4.1.1.	Environmental Baseline Survey 

 NASA has prepared a series of reports as part of the planning
process for the NRP, including Environmental Baseline Survey (“EBS”) reports and Closure Plans. The EBS reports summarize an assessment of known existing environmental conditions within the NRP area. These reports (Harding, 2000a; 2001a;
2001b) summarize information regarding: 
  

	 	•	 	status of site investigations and remediation; 

  

	 	•	 	nature and extent of known contamination, if any; 

  

	 	•	 	hazardous materials and waste management; 

  

	 	•	 	underground storage tanks (“USTs”) and aboveground storage tanks (“ASTs”); 

  

	 	•	 	status of building surveys for asbestos, lead-based paint, and radon; 

  

	 	•	 	locations of groundwater monitoring wells and groundwater treatment system components; and 

  

	 	•	 	other information pertaining to environmental conditions within the NRP area. 

  
 2-4 

 To organize the presentation of results in the EBS reports, the NRP area was divided into seven parcels as shown
on Figure 2. The EBS Reports provide a key summary of available information concerning existing environmental conditions and are referred to frequently in this EIMP. 
  

	 	2.4.1.2.	Closure Plans 

 NASA has also prepared a series of Closure Plans, which document the actions that
must be taken for closure of facilities whose operations used or stored hazardous materials. The Closure Plans include a description of the facilities and their hazardous material handling operations. Hazardous material storage areas and equipment
that may contain hazardous materials, such as PCB-containing electrical equipment, are identified, as well as subsurface and aboveground structures used to treat contaminated groundwater or industrial wastewater, such as sumps and oil water
separators. Closure procedures that must be followed for the facilities prior to demolition or as part of demolition are described, such as removal of equipment and subsurface structures such as USTs or sumps. The procedures include requirements for
additional surface and subsurface sampling to be conducted as part of facility closure to identify any residual contamination. Closure of facilities containing hazardous materials must be conducted in accordance with the Santa Clara County
Hazardous Materials Facility Closure Guidelines. These guidelines are discussed in the Closure Plans (e.g., PAI/ISSI Team, 2000). 
 NASA Closure Plans
are summarized in Table 2, along with a listing of the specific buildings and and general areas included in each Closure Plan. 
 NASA has conducted the
accessible soil sampling work identified in the Closure Plans. Closure Plan soil sampling reports have been completed for Closure Plan Area 1 (Buildings 111, 146, 958, and 952; PAI/ISSI, 2001b), Closure Plan Area 2 Building 555 (Harding,2001b;
PAI/ISSI, 2001g), Closure Plan 4 Area (PAI/ISSI Team, 2001D, Closure Plan 5 Area (PAI/ISSI Team, 2001i), Closure Plan 6 Area (PAI/ISSI Team, 2003b), Closure Plan 9 Area (PAI/ISSI Team, 2003c), and Closure Plan 10 Area (PAI, 2003c). The Closure Plans
also describe other actions, such as removal of USTs and sampling beneath structures, which will likely not occur until building demolition and site development. 
  

	 	2.4.2.	Installation Restoration Program 

 The Navy, as part of its Installation Restoration Program
(“IRP”) has been investigating and remediating soil and groundwater impacted by past use of chemicals at former NAS Moffett Field, including the NRP area. The Navy’s remedial program was initiated in 1984 when an initial assessment
study of former NAS Moffett Field was completed in response to the Defense Environmental Restoration Program (“DERP”). NAS Moffett Field was placed on the National Priorities List (“NPL”) by the U.S. Environmental Protection
Agency in 1987 and the investigation and remediation of NAS Moffett Field became subject to the Comprehensive Environmental Response, Compensation, and Liability Act (“CERCLA”). The Navy began conducting a Remedial
Investigation/Feasibility Study (“RI/FS”) for NAS Moffett Field coordinating its actions through a Federal Facility Agreement (“FFA”) with U.S. EPA and the Cal/EPA including the Department of Toxic Substances Control
(“DTSC”), and RWQCB (U.S. EPA, 1990). Initially, a total of 19 sites were identified in NAS Moffett Field for investigation. Subsequent investigations identified five additional sites for further study as part of the IRP

  
 2-5 

 
process (PRC, 1996). Under a Memorandum of Understanding between the Navy and NASA relating to the transfer of the former NAS Moffett Field to NASA, the Navy retains responsibility for compliance
with the terms of the FFA and for other environmental restoration or remediation of contaminants existing on the former NAS Moffett Field excluding releases caused by NASA or its tenants or occupants (NASA/Navy, 1992). 

After the initial phases of the Navy’s remedial investigation were conducted, the Navy, U.S. EPA, DTSC, and RWQCB agreed to organize the RI/FS process
into separate Operable Unit areas to address specific areas of NAS Moffett Field. In addition, in 1993, all IRP sites containing only petroleum and petroleum constituents were removed from the CERCLA process and are being managed according to
applicable state regulations (PRC, 1996). IRP sites within the NRP area include the following and are shown on Figure 3: 
  

	 	•	 	Operable Unit 2-West (includes IRP sites 10 (Chase Park), 14-North, 16, 17 and 18); 

  

	 	•	 	Petroleum Sites (includes sites 9, 14-South, 15, 19, and 24); and 

  

	 	•	 	West Side Aquifer (formerly Operable Unit 4). 

 The West Side Aquifer, which underlies the NRP area was
identified as one of the original Operable Units for NAS Moffett Field. In October 1992, U.S. EPA determined that the aquifers within this area were affected by regional groundwater contamination migrating from a group of companies located within an
area bounded by East Middlefield Road, Ellis Street, Whisman Road, and U.S. Highway 101 referred to as the Middlefield-Ellis-Whisman (“MEW”) Superfund Site located south of NAS Moffett Field in the City of Mountain View. U.S. EPA
determined that these aquifers were subject to the 1989 Record of Decision (“ROD”) already written for the MEW site, which selected appropriate actions for soil and groundwater remediation to address groundwater within the aquifer impacted
by VOCs (PRC, 1996). 
 The following Section 2.4.3 provides a summary of the COPCs detected in groundwater, as well as a description of groundwater
remedial actions that have been implemented. Sections 2.4.4 and 2.4.5 summarize the environmental conditions, COPCs and remedial actions that have been implemented for each of the 1RP Sites and petroleum sites, respectively, located within the NRP
area. 
  

	 	2.4.3.	West Side Aquifer Groundwater Contamination 

 The West Side Aquifers are located under a portion of
former NAS Moffett Field, west of the runways and including the NRP area. Groundwater contamination from chlorinated solvents and fuel products from on-site sources, such as the dry cleaner located at the former Building 88 (IRP Site 18) and fuel
operations at IRP Site 9 have commingled with the regional plume of VOC groundwater contamination that has migrated from the MEW Superfund site (PRC, 1996). 

A regional plume of chlorinated VOCs within the shallow aquifers (A1/A2) has migrated north from the MEW site located south of U.S. Highway 101 and extends
approximately 5,000 feet north of U.S. Highway 101 (PRC, 1996) throughout the main NRP area. The primary chemicals of concern are trichloroethene (“TCE”) and cis-1,2-dichloroethene (“cis-1,2-DCE”), although

  
 2-6 

 
several other VOCs are frequently detected including 1,1,1-trichloroethane (“1,1,1-TCA”), 1,1-dichloroethene (“1,1-DCE”), trans-1,2-dichloroethene (“trans-1,2-DCE”),
1,1-dichloroethane (“1,1-DCA”), tetrachloroethene (“PCE”) and vinyl chloride. Table 3 summarizes the maximum detected concentrations of the primary VOCs detected in groundwater samples collected within the NRP between February
1996 and May 2001, as reported in Mactec (2003b). An isoconcentration map for TCE is shown on Figure 4 based on the maximum detected TCE concentration in groundwater samples collected from each sampling location during the same time period using the
data in Mactec (2003b). The area of contamination extends generally throughout the NRP area, with the possible exceptions of a limited area in the southeast corner of the NRP and the western-most section of the NRP, near Highway 101 (see Figure 4).

 The MEW Companies have completed a feasibility study and remedial design for the regional groundwater plume north of U.S. Highway 101 and are currently
conducting a remedial action in the NRP area under the oversight of U.S. EPA. The MEW companies have constructed a regional groundwater recovery system within the NRP area that began routine operation in October 1998 (Tetra Tech, 1999b). The
groundwater remediation system consists of 14 groundwater extraction wells that pump groundwater to a treatment system located on the north side of Wescoat Road and east of McCord Avenue between Buildings 16 and 510 (see Figure 5). The treatment
system consists of two low-profile air strippers with vapor-phase granular activated carbon (“GAC”) used to treat off-gas from the lead air stripper (Locus, 1999). The MEW Companies’ regional groundwater recovery system layout of
extraction wells, conveyance pipelines, and treatment system is shown on Figure 5. The MEW ROD specifies that VOCs in groundwater are being remediated to maximum contaminant levels (“MCLs”) (U.S. EPA, 1989a). The MEW Companies submitted a
Two-Year Evaluation Report for the plume remediation in the area north of Highway 101 to U.S. EPA in April 2001. The report includes an analysis of data collected as part of the remediation program and an evaluation of the effectiveness of the
remediation system. 
 The Navy’s remedial investigation of the West Side Aquifers was completed in 1992. Results of the investigation indicated that
contamination from several source areas in NAS Moffett Field had impacted groundwater and commingled with the regional groundwater plume migrating froth the MEW site. The primary sources potentially contributing to the regional groundwater plume are
located in the northern portion of the NRP area located west and southwest of Hangar 1. The Navy, through negotiations with EPA and the MEW companies, agreed to remediate a portion of the regional groundwater contamination plume. Five areas within
the Navy’s treatment area were identified as sources or potential sources of fuel-related or VOC groundwater contamination and are shown on Figure 3. These areas include: 1) 13 former USTs and one aboveground storage tank located in the
Building 29 area (see Section 2.4.5.2); 2) four former USTs at the site of a former NEX service station (Building 31) (see Section 2.4.5.2); 3) the NEX service station (Building 503), located east of former Building 88, where a steel UST was found
to be leaking (see Section 2.4.5.1); 4) a former dry cleaning facility located in former Building 88, which has been demolished (see Section 2.4.4.5); and 5) the former wash rack (Sump 25) located just south of Hangar 1 (see Section 2.4.5.4). The
first three sources have been identified as sources of fuel-related contamination, Building 88 has been identified as a source of VOC contamination, primarily PCE, and the wash rack area is considered a potential VOC source (Tetra Tech, 1998a). 

  
 2-7 

 Within the area located downgradient of the potential sources in the northern portion of the NRP, the most
frequently detected VOCs include TCE and cis-1,2-dichloroethene, with lesser amounts of PCE and vinyl chloride. PCE is found in both the Al- and A2-aquifers, but is confined primarily to the area downgradient from the former Building 88 dry cleaning
facility, which was identified as a source of PCE contamination. Vinyl chloride was most frequently detected in areas that also contain fuel-related contamination, and is likely the result of cometabolic biodegradation (PRC, 1997). Groundwater
contaminated by fuel-related chemicals is limited to the shallow Al-aquifer zone, with the old fuel farm (Building 29) and old NEX service station (Building 31) being the primary sources. Figure 6 shows an isoconcentration contour map for Total
Purgeable Petroleum Hydrocarbons reported as gasoline (“TPHg”) in groundwater within the NRP area, based on groundwater monitoring data obtained from NASA. Figure 7 shows an isoconcentration map for benzene in groundwater based on maximum
detected concentrations in groundwater samples at each sampling location, based on the data in Mactec (2003b). Another localized area of contamination by fuel-related chemicals is associated with. Tanks 19 and 20 (Petroleum Site 14-South; see
Section 2.4.5.3), which is located in the southeast corner of the NRP area (See Figures 3, 6, and 7). 
 From 1993 to 1997, the Navy operated three small
groundwater extraction and treatment systems as source control measures within the West-Side Aquifer area to address VOCs and fuel-related chemicals from source areas at Buildings 29, 31, and 88 (Petroleum Site 9 and IRP Site 18). Groundwater was
extracted from converted 4-inch monitoring wells. In addition, water was pumped from two sumps to collect groundwater that had infiltrated into the storm drain system. The groundwater was treated by either GAC or a low-profile air stripping system.
In 1997, the Navy began construction of the West-Side Aquifers Treatment System (“WATS”) to extract and treat groundwater impacted by VOCs and petroleum hydrocarbons in the A-1 and A-2 aquifer zones. The Navy began operating the WATS in
1998, which currently treats groundwater pumped from six Al-aquifer zone extraction wells, two A2-aquifer zone wells and the storm drain sumps (PRC, 1997). In June 2001, the Navy submitted a draft Annual Report to the U.S. EPA that included an
evaluation of the effectiveness of the Navy’s groundwater remediation system (Foster Wheeler, 2001). 
 NASA and the MEW Companies entered into an
Allocation and Settlement Agreement to allocate responsibility for groundwater remediation of the Regional Plume north of Highway 101. An allocation map that identifies the party responsible for remediation of the West Side Aquifers in different
areas is included as Appendix A. Only the Navy and MEW Companies are responsible for remediation of the West Side Aquifers within the NRP area. Although the Navy participated in negotiations of the Allocation and Settlement Agreement, the Agreement
has not been signed by the Navy. 
  

	 	2.4.4.	Installation Restoration Program Sites 

 This section includes summaries of the environmental conditions,
COPCs and remedial actions that have been implemented for the following IRP sites located within the NRP that were included as part of Operable Unit 2-West: 
  

	 	•	 	IRP Site 10 (Chase Park); 

  
 2-8 

	 	•	 	IRP Site 14-North; 

  

	 	•	 	IRP Site 16 (Sump 60); 

  

	 	•	 	IRP Site 17 (Sump 61); and 

  

	 	•	 	IRP Site 18. 

  

	 	2.4.4.1.	IRP Site 10 (Chase Park) 

 IRP Site 10 includes both the NAS Moffett Field runways and Chase Park, a recreation
area located just north of Highway 101 (see Figure 3). Only the Chase Park area is located within the NRP area. No contaminant sources have been identified in the Chase Park area, but the underlying groundwater is contaminated with VOCs from the MEW
site regional groundwater VOC plume (IT Corp., 1993b). 
  

	 	2.4.4.2.	IRP Site 14-North 

 Site 14 North (Tanks 67 and 68) were located on the southeastern side of the
dry cleaners’ building (Building 88), which was investigated as part of the Site 9 and Site 18 investigations (see Figure 3). Before its removal in May 1990, Tank 67 was used to store, fuel oil for the Building 88 boiler. The results of
analyses of soil samples collected during the tank removal indicated only low levels of VOCs (maximum concentration of TCE of 0.1 milligrams per kilogram (“mg/kg”)). TPHd was detected (0.15 mg/kg) in only a single soil sample from a pipe
trench excavation (PRC, 1991b). Tank 68 was reportedly a 2,000 gallon UST used to store waste solvents and was closed in place (IT Corp., 1993b). Tank 68 was later removed during the Building 88 remediation described in Section 2.4.4.5.
Investigations did not identify significant contamination associated with Tank 68 (PRC, 1996). 
  

	 	2.4.4.3.	IRP Site 16 (Sump 60) 

 Site 16 (Sump 60) was a public works steam-cleaning rack system
that consisted of two catch basins that drained a concrete wash pad to an underground oil/water separator, and a 250 gallon tank (Figure 3). Vehicles were steam cleaned on the concrete containment pad. Sump 60 was removed in October 1990. Additional
overexcavation to a depth of 10 feet was performed when soil in the excavation was observed to be visibly contaminated. Excavated soils were stockpiled for treatment with other contaminated soils from NAS Moffett Field (PRC, 1991b). 

Soil and groundwater samples, as well as a sample of sludge were collected when Sump 60 was removed in October 1990 and analyzed for VOCs (including BTEX),
TPHg, TPHd, SVOCs, and metals. The sampling results are compiled in the Tank and Sump Removal Summary Report (PRC, 1991b). Methylene chloride, bis(2-ethylhexyl)phthalate, and 4-methylphenol were detected in the sludge samples at concentrations of
3.3 mg/kg, 5.3 mg/kg, and 1.2 mg/kg, respectively; however, none of these chemicals was detected in soil samples collected from the sump excavation. Low residual concentrations of toluene (maximum concentration 0.21 mg/kg) and xylene (maximum
concentration 0.011 mg/kg) were detected in soil samples collected from the walls and floor of the excavation. TPHd was detected in one sample collected from the floor of the final excavation at 160 mg/kg. Several metals were detected in soil
samples at 

  
 2-9 

 
concentrations that slightly exceeded estimated background levels; however, the concentrations were well below U.S. EPA PRGs for residential land use. TCE was detected in groundwater at a
concentration of 0.14 mg/L. An additional groundwater monitoring well was later installed upgradient of the Sump 60 well to determine if Sump 60 was a source of VOCs. Concentrations of VOCs in the upgradient well were higher than concentrations
measured downgradient of Sump 60 suggesting Sump 60 was not a source of VOCs (PRC, 1993). U.S. EPA issued a letter dated 17 December 1993 stating that soils associated with Sump 60 required no further action (PRC, 1995b) 

Closure Plan 1 identified Sump 60 as a potential location that may require additional excavation of impacted soils during redevelopment activities (PAI/ISSI
Team, 2000). 
  

	 	2.4.4.4.	IRP Site 17 (Sump 61)  

 Site 17 includes the sump (Sump 61) for the Public Works Paint Shop
located in Building 45 (Figure 3). The sump received wastes from the paint shop (Building 45) and from Hangar 1. Waste from the paint shop included oil- and latex-based paints, thinners, toluene and turpentine. The types of wastes from Hangar I are
unknown. Sump 61 was removed in October 1990. Excavated soils were stockpiled for treatment with other contaminated soils from NAS Moffett Field. 
 Soil
and groundwater samples were collected when Sump 61 was removed in October 1990 and analyzed for VOCs (including BTEX), TPHg and TPHd. The sampling results are compiled in the Tank and Sump Removal Summary Report (PRC, 1991b). Low levels of
toluene (0.036 mg/kg) were detected in soil collected from the excavation wall at the soil/groundwater interface. TPH was not detected in any of the soil samples. TCE was detected at a concentration of 0.1 mg/kg in a soil sample collected below the
water table during installation of a groundwater monitoring well; however, this likely reflects the regional VOC groundwater contamination, as evidenced by the TCE concentration of 2.4 mg/L in the groundwater sample collected from this well (PRC,
1991b). U.S. EPA issued a letter dated 17 December 1993 stating that soils associated with Sump 61 required no further action (PRC, 1995b). 
  

	 	2.4.4.5.	IRP Site 18 

 Site 18 includes Sump 66 located on the northern side of former Building 88, which
collected wastewater from the dry cleaning operation (see Figure 3). This sump was removed in May 1990. Excavated soils were stockpiled for treatment with other contaminated soils from NAS Moffett Field. Sample data from the excavation did not
indicate significant contaminant levels, with PCE detected in only one of three soil samples at a concentration of 0.02 mg/kg; however, previous investigation of this area indicated concentrations of PCE as high as 6.9 mg/kg (PRC, 1991b). 

Tank 67 was a 20,000-gallon UST used to store fuel oil for the Building 88 boiler (see Section 2.4.4.2). It was removed in 1990 and no visible contamination
was observed in the excavation. Confirmation soil sampling data from the excavation indicated low concentrations of TCE (0.01 mg/kg) (PRC, 1991b). 

  
 2-10 

 Tank 68 was a UST of unknown composition and capacity located adjacent to the east side of former Building 88
(see Section 2.4.4.2). This tank may have stored waste solvents and petroleum products generated by operations in Building 88 and was reportedly closed in place. Samples collected from slant soil borings drilled below the tank in 1990 were found to
contain low concentrations of VOCs including PCE and TCE (maximum concentration of 0.14 and 0.028 mg/kg respectively) (PRC, 1991b). 
 A remedial action was
conducted at Building 88 in 1994 and 1995. The building, foundation, underground piping, Tank 68 and Sump 91 (a sump located on the northern side of former Building 88 which collected water from the building’s floor drains) were demolished and
removed. Confirmation sampling after the removal of Tank 68 and Sump 91 did not indicated any significant contamination. Low residual VOC concentrations were detected in soil samples collected from the Tank 68 (maximum PCE concentration of 0.130
mg/kg) and Sump 91 (maximum PCE concentration of 0.003 mg/kg) excavations. Therefore, no additional soil removal was performed in these areas (PRC, 1995c). 

Approximately 400 cubic yards of contaminated soil were excavated and treated from two areas after removal of the floors, foundation and underground piping of
Building 88. The primary source of contamination was believed to be associated with floor drains in the building. PCE was detected in soil samples collected from below the building at concentrations up to 1 mg/kg. Areas where PCE concentrations were
greater than 0.5 mg/kg were designated for excavation, based on the soil cleanup standard established in the ROD for the MEW Superfund Site, which U.S. EPA determined was applicable to remedial actions in the West Side Aquifer area. Following
excavation to the saturated zone, additional confirmation samples were collected from the walls and floor of the excavation. PCE was detected in all confirmation samples collected from the walls of the excavation at concentrations ranging from 0.009
to 0.016 mg/kg. Saturated soil samples collected from the floor of the north excavation area contained 0.46 to 1.1 mg/kg PCE, which was above the established cleanup standard; however, no additional excavation of soil was performed. Confirmation
soil sampling results showing residual levels of VOC contamination in the Building 88 area are compiled in the Final Operable Unit 2 — West (Building 88) Project Summary Report (PRC, 1995c). 

 

	 	2.4.5.	Petroleum Sites 

 This section includes summaries of the environmental conditions, COPCs and remedial
actions that have been implemented for the following IRP petroleum sites located within the NRP that were initially included as part of Operable Unit 2-West, as well as the Naval Exchange Gasoline Service Station: 

 

	 	•	 	Naval Exchange Gasoline Service Station; 

  

	 	•	 	IRP Site 9; 

  

	 	•	 	IRP Site 14-South; 

  

	 	•	 	IRP Site 15; 

  
 2-11 

	 	•	 	IRP Site 19; and 

  

	 	•	 	IRP Site 24. 

  

	 	2.4.5.1.	Naval Exchange Gasoline Service Station  

 The Naval Exchange Gasoline Service Station
(“NEX service station”) (Building 503) is located just to the east of Site I8 and the location of former Building 88, and south of Hangar 1 (see Figure 3). It was identified as a potential source of petroleum contamination when petroleum
fumes were detected in a sanitary sewer inside Hangar 1 located approximately 500 feet north of the station. Contaminants apparently migrated along permeable subsurface paths from the tank backfill into the sanitary sewer pipeline trench and along
the trench into the hangar. A subsequent soil investigation indicated the NEX service station as the source of contamination (PRC, 1990). 
 The Navy tested
the integrity of four steel USTs and four fiberglass USTs. The results indicated that a steel UST had leaked. The Navy subsequently removed the four steel USTs (Tanks 33 —36) in 1990. A vapor recovery sump (Sump 42) was also removed at this
time (see Section 2.4.5.4). Approximately 1,600 gallons of gasoline and groundwater were recovered from the excavation during the tank removal. Elevated concentrations of TPHg and BTEX compounds were detected in soil samples collected from the
excavation. Maximum concentrations for TPHg, benzene, toluene, ethylbenzene and total xylenes were 1,500 mg/kg, 10 mg/kg, 42 mg/kg, 24 mg/kg, and 150 mg/kg, respectively. Concentrations of TPHg and benzene in a groundwater grab sample collected from
the excavation were 57 mg/L and 5.6 mg/L, respectively. Excavated soil contained up to 1,200 mg/kg TPHg and 2.7 mg/kg benzene as detected in composite samples collected from the soil stockpiles. After discussion with the Santa Clara County
Environmental Health Department (“SCCEHD”) and the RWQCB, contaminated soils from the Sump 42 and UST excavations were backfilled after removal of the tanks and sump with any remediation deferred until further investigation could be
conducted (PRC, 1990). 
 The fiberglass USTs (Tanks 37 — 40) were removed in 1993 as part of the Navy’s UST removal program. Soil samples were
collected from the sidewalls and the floor of the excavation. Elevated concentrations of TPHg and BTEX compounds were detected with maximum reported concentrations for TPHg, benzene, toluene, ethylbenzene and total xylenes of 1,300 mg/kg, 8.3 mg/kg,
39 mg/kg, 22 mg/kg, and 120 mg/kg, respectively (PRC, 1994e). 
 Additional investigation of the NEX service station was conducted in 1994. Soil and
groundwater samples were collected with the Geoprobe sample collection system and an on-Site mobile laboratory was used for sample analysis. After review of the Geoprobe data and discussion with regulatory agencies, an additional four soil borings
and four groundwater monitoring wells were installed. Soil and groundwater samples were collected and analyzed at an off-Site laboratory for TPH, BTEX compounds, and SVOCs. The primary chemicals of concern are TPHg, and BTEX compounds, although
several SVOCs were detected at low concentrations, including naphthalene (maximum concentration of 6.4 mg/kg) and 2-methylnapthalene (maximum concentration of 5.5 mg/kg) (PRC, 1994e). 

  
 2-12 

 Maximum concentrations of TPHg and BTEX compounds detected in the NEX service station area were as follows: TPHg
(1,500 mg/kg); benzene (75 mg/kg); toluene (220 mg/kg); ethylbenzene (340 mg/kg); and xylene (910 mg/kg). Analytical results from soil sampling suggest that gasoline has migrated north from the location of the former steel and fiberglass tanks. TPHg
appears to be concentrated in soils at depths of 5 to 7.5 feet bgs in this area (PRC, 1994e). 
 Two additional tanks (Tanks 41A and 41B) were located at
the NEX service station and have been removed. Tank 41B was an oil-water separator removed in January 1993 (Harding, 2001a). Low concentrations of petroleum contaminants (4.6 mg/kg of TPHg and 0.012 mg/kg of benzene) were detected in one of two
samples collected during its removal (PRC, 1994e). Tank 41A was a 550 gallon UST that stored waste oil. Pipelines carried waste oil from the NEX service station service bays to Tank 41A. After extractable TPH as motor oil was detected at a
concentration of 6,400 mg/kg underneath the tank, additional excavation was conducted and revealed visible soil contamination on the western sidewall; excavation was halted because of the proximity of the excavation to Building 503. Analysis of a
sample collected from the excavation sidewall indicated extractable TPH as motor oil at a concentration of 3,400 mg/kg and TPHg as 230 mg/kg. In 1995, additional Geoprobe sampling was conducted at four locations surrounding the former tank. TPH as
motor oil was detected at a maximum concentration of 82 mg/kg at a location approximately five feet west of the 1991 excavation sidewall sample. Analysis of a groundwater grab sample collected from the same location found TPH as motor oil at a
concentration of 3.3 mg/L. The Navy has recommended closure of Tank 41A in a report submitted to the RWQCB for review in January 2001 (Tetra Tech, 2001a). 

The Navy has evaluated the results of the soil and groundwater investigation of the NEX service station and conducted a risk assessment using the risk-based
corrective action (“RBCA”) methodology (Tetra Tech, 2003c). Based on its evaluation, the Navy has concluded that no further remediation is necessary. This evaluation approach is described further in Section 4.3.4. 

 

	 	2.4.5.2.	IRP Site 9 

 Site 9 encompasses approximately 11 acres west of Hangar I within the NRP area (see
Figure 3). Subsurface soil and groundwater within this area have been impacted by petroleum hydrocarbons (primarily gasoline and aviation fuel) from leaking pipes and USTs (PRC, 1996). Contamination generally resides in the capillary fringe at
depths of approximately 8 to 10 feet bgs (PRC, 19940. Building 29 and the surrounding area is the site of the old fuel farm. Aviation gasoline was stored in 13 USTs (Tanks 47-50, 79-84, and 97-99) and one aboveground storage tank (Tank 52) between
the 1940s and 1964. The USTs were removed in July 1993. Numerous soil samples collected in the vicinity contained TPH concentrations in excess of 1,000 mg/kg. BTEX compounds were also detected, but generally at low concentrations below I mg/kg (PRC,
1991b, 1994a). Maximum concentrations detected of benzene, toluene, ethylbenzene, and xylene were, respectively, 1.4 mg/kg, 0.46 mg/kg, 3.6 mg/kg, and 2.4 mg/kg. Low concentrations of chlorinated VOCs were locally detected in soil samples, however,
generally at concentrations less than 0.025 mg/kg, which suggests that their presence in soil may be related to the underlying regional VOC groundwater contamination (PRC, 1991a). 

  
 2-13 

 The old Naval Exchange gasoline station was located near Building 31. Four former USTs (Tanks 56A, B, C, and D)
stored gasoline from the 1940s to 1964. The USTs were removed in October 1990. During tank removal, a visible sheen on groundwater and strong hydrocarbon odors were observed in the excavations for Tanks 56B, C, and D. Excavated soils were stockpiled
for treatment with other contaminated soils from NAS Moffett Field. Soil samples collected from the wall and floor of the tank excavations contained up to 4,570 mg/kg of TPHg, 4.45 mg/kg of benzene, 30 mg/kg of ethylbenzene, 16 mg/kg of toluene, and
197.7 mg/kg of total xylenes (PRC, 1991c). 
 Site 9 has been evaluated in numerous investigations conducted between 1988 and 1996 to characterize the site
and evaluate and implement source control actions (PRC 1991a; 1991c; 1991d; IT Corp.,1993b). No free product has been observed during site investigations at Site 9 and petroleum sources have been removed (Tetra Tech, 2003b). Residual concentrations
of purgeable and extractable TPH and other petroleum constituents remain in soil and groundwater in the Site 9 area. The Navy has submitted a risk assessment for the Site 9 area to the RWQCB for review as part of its evaluation of petroleum sites at
MFA (Tetra Tech, 2003b). The Navy is recommending closure for the Site 9 (Buildings 29 and 31 areas) without any further remediation. The results of this risk assessment are summarized in Section 4.3.4.3. 

 

	 	2.4.5.3.	IRP Site 14-South 

 Site I4-South is an operating vehicle maintenance facility (Figure 3). Leakage
from two removed USTs (Tank I9 and 20) and piping appear to have contributed to soil and groundwater contamination. Soil contamination at Site I4-South is mainly confined to the 15- to 25- foot bgs depth interval, which are saturated soils within
the Al aquifer. The maximum TPHg concentration detected was 1,300 mg/kg. Benzene concentrations ranged from 0.002 to 0.5 mg/kg except for a sample collected from I8 feet bgs that contained 7.1 mg/kg. Toluene concentrations ranged from 0.005 to 2.4
mg/kg; ethylbenzene concentrations ranged from 0.007 to 34 mg/kg; and detections of xylene ranged from 0.022 to 51 mg/kg (PRC, 1994e). 
 A groundwater pump
and treat system was previously operated at this site, but was abandoned when low permeability soils limited extraction flow rates. A recirculating in situ treatment system was installed and operated until 1998 when it was turned off to allow
natural attenuation to occur (Harding, 2001c). Groundwater sampling and analysis conducted by the Navy in February 2000 in the vicinity of Tanks I9 and 20 indicated a benzene concentration in groundwater of 3.0 mg/L. The NASA Closure Plan (Closure
Plan Number I, dated October 2000) for this area discusses the requirement for potential additional soil excavation associated with Tanks I9 and 20 (PAI/ISSI Team, 2000). 
  

	 	2.4.5.4.	IRP Site 15 

 IRP Site 15 includes eight sumps and one tank distributed throughout the
former NAS Moffett Field. Four of the sumps (Sumps 25, 42, 58, and 62) are located within the NRP area (Figure 3). Sumps 25 and 42 are both located near the NEX service station (Section 2.4.5.1), where soil and groundwater has been impacted by
petroleum hydrocarbons. 

  
 2-14 

 Sump 25 previously collected wastewater generated by aircraft washing activities south of Hangar 1 and was
removed in May 1994. A confirmation soil sample collected from the Sump 25 excavation contained purgeable TPH at 5,800 mg/kg and TPHd at 9,500 mg/kg. A water sample collected from the excavation contained 100 ug/L purgeable TPH as jet fuel and 3,300
ug/L extractable TPH as motor fuel (PRC, 1994a). VOC concentrations in groundwater samples collected from the Al-aquifer zone below the wash rack are slightly higher than would be expected in the underlying regional groundwater plume. Consequently,
the former wash rack area is considered a potential VOC source to the Al-aquifer plume. A site-specific evaluation of the need for further action regarding Sump 25 is being conducted in accordance with the Basewide Petroleum Site Evaluation
Methodology (Tetra Tech, 1998b) described in Section 4.3.4. 
 Sump 42 was used as a vapor condensation sump at the NEX service station. It was removed
along with four nearby USTs in 1990, as described in Section 2.4.5.1. During the tank removal, floating product was noted in the groundwater that seeped into the excavation. While excavated soil from the tank and sump removal contained up to 1,200
mg/kg TPHg and 2.7 mg/kg benzene, soil samples collected from beneath the sump and associated piping contained only low concentrations of TPHg and benzene (32 mg/kg and 0.2 mg/kg, respectively). Contaminated soils from the Sump 42 and UST
excavations were backfilled after removal of the tanks and sump (PRC, 1990). Residual contamination of soil and groundwater from petroleum hydrocarbons associated with Sump 42 is being addressed as part of the site-specific evaluation of the NEX
service station area in accordance with the Basewide Petroleum Site Evaluation Methodology (PRC, 1996; Tetra Tech, 1998b). 
 Sump 58, consisting of a
300-gallon storage tank and two small sumps, was an oil/water separator that was removed in April 1994. Soil samples collected near the bottom of the excavation pit contained TPHd concentrations up to 2,300 mg/kg and TPHg concentrations up to 740
mg/kg. The NASA Closure Plan for this area discusses the need for potential additional soil excavation associated with Sump 58 (PAI/ISSI Team, 2000). 

Sump 62 consisted of two separate pits that were used as an oil/water separator and received excess oil- and latex-based paints and wastewater from painting
operations in the paint shop spray booth. The sump also collected overspray from the paint spray booth through a floor drain. The paint shop activities ceased in October 1992; sump 62 was drained, cleaned, and is inactive (PRC, 1994a). NASA
collected soil and water samples near the sump as part of a Phase II investigation. Although TCE and other VOCs were detected in many of the samples, the concentrations were consistent with levels found in soils overlying and within the regional VOC
groundwater plume. TCE was the only VOC detected in soil samples collected from above the water table and its detected concentration ranged from 0.007 to 0.054 mg/kg. Additionally, inspections revealed that Sump 62 was structurally sound and no
indications of leakage were observed (PRC, 1994f). 
  

	 	2.4.5.5.	IRP Site 19 

 IRP Site I9 includes four former USTs (Tanks 2, I4, 43, and 53) that are
found at various locations around former NAS Moffett Field. Only Tank 14 is located within the NRP area (Figure 3). Tank 14 was a 1,100-gallon diesel fuel storage tank for the backup generator in 

  
 2-15 

 
Building 158, the operations building. This tank was removed and soil and groundwater was sampled during May and June 1990. Soil in the excavation was visibly stained and its distribution and the
condition of the tank (i.e., there was no indication of leaks) suggested tank overfilling may have caused the contamination. Based on results of initial soil sampling of the excavation (4,400 mg/kg TPHd), additional soil was excavated and disposed
off-site. The confirmation sample collected from the north wall of the enlarged excavation contained 1,700 mg/kg TPHd; other confirmation samples indicated negligible amounts (<25 mg/kg) of TPHd and TPH as motor oil (PRC, 1991a). 

Additional soil sampling was conducted in May 1992 to assess the extent of soil impacted by TPHd near former Tank 14. Soil samples were collected from three
locations near the northern boundary of the 1990 Tank 14 soil excavation. None of the six soil samples collected contained detectable concentrations of TPHd (PRC, 1993). The Navy submitted a request for closure for Tank I4 to the RWQCB for review in
December 2000 (Tetra Tech, 2000b). 
  

	 	2.4.5.6.	IRP Site 24 

 Site 24 includes the Hangar I fuel pits, high-speed fuel hydrants, and the
fuel pier. Only the Hangar I fuel pits are located within the NRP area. During construction of Hangar I, three aviation gasoline dispenser pits and three aviation gasoline valve pits were installed in the floor of the hangar to service dirigibles.
The pits are now covered by concrete or offices. In 1987, the Navy installed a new concrete floor in the southern half of the building. As a result, the location of the third pit could not be identified and no investigation of this former pit was
conducted. Two soil borings were advanced through two of the pits and soil and groundwater samples were collected. Purgeable TPH was not detected in any of the soil or groundwater samples collected. Low concentrations of VOCs (less than 0.011 mg/kg
of PCE, TCE, 1 ,2-DCE, and toluene) were detected in soil samples, as well as in groundwater samples. PRC concluded that the detection of chlorinated VOCs is likely the result of the underlying regional groundwater VOC contamination (PRC, 1996).
Based upon the results of a risk assessment, the Navy has recommended closure of Site 24 with no additional remediation (Tetra Tech, 2003a). 
  

	 	2.4.6.	Survey of Lead in Soil 

 As discussed in Section 2.6.2, lead-based paints were previously used at Moffett
Field. In 1993, Chemical Waste Management, Inc. (“CWMI”) conducted a facility wide investigation to assess the potential presence of lead in soil surrounding buildings that may have used lead-based paints on exterior surfaces (CWMI, 1993).
CWMI collected 332 discrete surface soil samples from within 2 feet of the periphery of 96 buildings. The sample collection strategy assumed collecting a single discrete sample from each 30-foot long sample cell alongside the building perimeter.
These samples were analyzed for total lead and for soluble lead using the Waste Extraction Test (“WET”) if the total lead concentration was in excess of 50 mg/kg. The survey showed that the soils around most of the buildings were impacted
by lead (i.e., lead was detected above background levels) and at many buildings, lead concentrations were detected at levels above the U.S. EPA Region IX residential land use PRG of 400 mg/kg. The total lead concentration at several locations also
exceeded the U.S. EPA industrial land use PRG of 1000 mg/kg, which is also the concentration (Total Threshold Limit Concentration or “TTLC”) at which excavated soil would be considered hazardous waste under California hazardous waste
regulations if it were 

  
 2-16 

 
excavated and disposed. Soluble lead levels analyzed with the WET test exceeded the Soluble Threshold Limit Concentration (“STLC”) of 5 mg/L at several locations, as well. Detections of
lead at levels above the TTLC and STLC levels were generally more sporadic. A summary of the buildings where perimeter soils were tested for lead and which identified buildings with soil lead concentrations exceeding residential or
industrial/commercial land use PRGs is included in the EBS Reports (Harding, 2000a, 2001a, 2001b). 
 The TTLC and STLC levels are limits used by the State
of California to classify waste as hazardous for disposal purposes. In addition, the California Health & Safety Code Section 25157.8 places additional restrictions on disposal of soil in California containing lead at concentrations above 350
mg/kg, but below the TTLC limit of 1,000 mg/kg. Such soil must be disposed at a Class 1 hazardous waste landfill or at a Class 2 landfill specifically permitted to accept such soil. The Class 2 Altamont Landfill near Livermore, California is
permitted to accept soil containing up to 1,000 mg/kg lead that is not classified as hazardous waste. 
 A major limitation to the CWMI work was the use of
discrete soil samples to establish the presence or absence of lead contamination instead of composite samples. Because of the sporadic way in which lead-based paint chips can be distributed in the soil, results from discrete soil samples can be
highly variable depending on whether paint chips are present or absent in the sample. A multiple-increment composite (as discussed in ASTM Standard D-6051-96 (ASTM, 1996)) would likely be more representative of bulk soil conditions in each 30-foot
sample cell. In addition, since the CWMI study was designed to only provide an overview of lead concentrations in surface soil surrounding buildings at Moffett Field, no data were collected regarding the lateral and vertical extent of elevated
levels of lead detected in the soils. 
 A more detailed follow-up investigation was conducted by Roy F. Weston (“Weston”) for the U.S. EPA
(Weston, 1998). One-hundred twenty discrete surface soil samples were collected from selected areas around ten buildings and one former building site, most of which had detectable lead-based paint on their exteriors. Insofar as the samples were
collected along short transects, the Weston study provided some data on the lateral extent of lead contamination away from a building source. Samples collected as far away as 7.5 feet from the building wall were found at some locations to contain
lead above the TTLC or STLC levels. 
 The Weston study is similar to the CWMI study in terms of limitations. Discrete sample data were collected instead of
multi-increment composite data. Also, there were no data generated defining the depth to which the lead contamination had penetrated. Although horizontal transect sampling was performed, the sampling transects were not extended far enough to give an
indication of the maximum lateral distance within which elevated concentrations of lead could still be encountered. 
 During 2002, Harding ESE prepared a
report that summarized the available data for lead in soil near buildings within the NRP and presented a work plan for obtaining additional lead data for soil as well as for removing soil known to contain lead based paint (Harding ESE, 2002a). In
accordance with the work plan, additional soil samples were collected near buildings 24, 943, 510, 29, 3, 533, 113, 512C, 547B, and 329 during September 2002. The soil samples consisted of six-point composite samples from cells up to 30-feet long
and 20-feet wide. The discrete samples used to make up the composite samples were collected from 0 to 6 inches below the ground 

  
 2-17 

 
surface at the building dripline or no more than 2 feet from the building wall if the dripline was not apparent. Each composite sample was tested for total lead by EPA Method 6010. Samples found
to contain greater than 50 mg/kg lead were tested also for leachable lead using the WET method. 
 As reported in Mactec (2003a), soils in the vicinity of
Building 113 contain lead at concentrations greater than the NASA Environmental Screening Level (“ESL”) of 200 mg/kg. These soils also exceed the STLC of 5.0 mg/L. Accordingly, prior to building demolition, soils in the vicinity of this
building will require removal and disposal as a hazardous waste. Post-removal confirmation sampling will also be required. 
 Soils in the vicinity of
Buildings 3, 29, 113, and 510 contain leachable lead at concentrations greater than the STLC of 5.0 mg/L but contain total lead at concentrations less than the NASA ESL of 200 mg/kg. Because these soils contain lead at concentrations less than 200
mg/kg, they can be left in place. If, however, these soils are to be excavated and moved elsewhere, then the soils must be disposed as hazardous waste because they contain leachable lead greater than the STLC. 

 

	2.5.	Summary of Existing Subsurface Structures That May Require Removal 

 While most of the original USTs,
oil-water separators and sumps located within the NRP area have been removed, a number of these subsurface structures still remain in place and may need to be removed during development of the NRP area. Existing and former USTs, sumps and oil-water
separators are identified in the EBS Reports prepared by Harding (Harding, 2000a, 2001a, 2001b). In addition, the Closure Plans prepared by NASA also describe existing subsurface structures associated with buildings in the NRP area (see Section
2.4.1.2). 
 As described in earlier sections, the Navy has conducted investigations at many of the IRP petroleum sites at MFA to evaluate and characterize
the extent of petroleum contamination. Although petroleum contamination remains at several of the sites, USTs and sumps have been removed from many of these sites as summarized in the EBS Reports (Harding, 2000a, 2001a, 2001b). 

 

	2.6.	Summary of Hazardous Materials Associated With Existing Structures And Current Operations 

 Many of the
existing buildings within the NRP contain hazardous materials, such as asbestos-containing materials, lead-based paints, and equipment containing PCBs. In addition, hazardous materials have been or are being stored, and hazardous waste has been or
is being generated at existing buildings within the NRP. The following sections describe hazardous materials associated with existing structures or operations within the NRP area. 

 

	 	2.6.1.	Asbestos-Containing Materials 

 Many of the existing buildings within the NRP are known to contain
asbestos-containing materials (“ACM”) as a result of a limited asbestos survey of housing units conducted by the Navy in 1988, a basewide asbestos survey conducted by Tetra Tech in 1993, and sampling of several individual buildings that
was conducted as a result of building modifications being 

  
 2-18 

 
performed. In addition to the buildings with confirmed or suspect ACM present, other buildings are assumed to likely contain ACM due to their age (Harding, 2000a). NASA has conducted surveys of
buildings in the NRP to identify and evaluate the presence or absence of asbestos (Benchmark, 2001, 2003). 
 The EBS Reports prepared by Harding (Harding,
2000a, 2001a, 2001c, 2001b) summarize the results of asbestos, surveys that have been completed for buildings in the NRP. Additional information regarding the potential presence of asbestos in buildings has been obtained by NASA in the course of
ongoing building renovations within the NRP. Hard copy reports of the asbestos surveys conducted to date at the NRP are located in the NASA ARC Occupational Safety Health & Medical Services Office (Steen, 2003). 

 

	 	2.6.2.	Lead-Based Paints 

 Given the age of buildings within the NRP and the common usage of lead-based paints
prior to 1978, it is assumed that the majority of buildings/structures within the ‘NRP contain lead (Harding 2000a). Several buildings within the NRP have been sampled for the presence of lead-based paints in conjunction with building
modifications. The EBS Reports list the construction dates for buildings within the NRP, identify those buildings that have been sampled for the presence of lead-based paints and the dates they were sampled, and indicate at which buildings
lead-based paints were detected. NASA has conducted additional surveys of buildings in the NRP for the presence of lead-based paints (Benchmark, 2001). Sampling for lead-based paints focused on buildings with surfaces on which peeling paint was
observed, and which were slated for demolition during development of the NRP. 
 Soil sampling has also been previously conducted around the perimeter of
buildings that may have had lead-based paints used on exterior surfaces. This soil sampling program is described in Section 2.4.6. 
  

	 	2.6.3.	PCBs in Equipment and Building Materials 

 Transformers or capacitors containing PCBs at concentrations
above the Department of Health Services (“DHS”) regulated concentration for hazardous waste (5 parts per million or “ppm”) are present within the NRP. The EBS Reports (Harding, 2000a, 2001a, 2001c, 2001b) summarize the results of
previous inventories of potential PCB-containing equipment and identify buildings with equipment containing PCBs, whether the equipment has been sampled, and if so, the dates of sampling, and the concentration of detected PCBs. Several pieces of
equipment that have not been tested for PCBs are included in this summary since they are assumed to contain PCB concentrations greater than 500 ppm in accordance with U.S. EPA regulations (40 CFR 761). 

The NASA Environmental Services Office performs quarterly inspections, completes Annual Document Logs, and submits transformer registration of equipment with
PCBs at greater than or equal to 50 ppm to the U.S. EPA in compliance with 40 CFR 761. In addition, the NASA Facilities Maintenance group completes additional inventories, inspections, and testing of the equipment (Harding, 2000a). 

In addition to PCB-containing transformers or capacitors, buildings with fluorescent lighting may contain PCB light ballasts (Harding, 2000a). 

  
 2-19 

 Another significant source of PCBs at the NRP is Hangar I, located in Land Use Parcel I8 (Figure 2). Most
notably, bulk samples of the lower (gray) walls have been found to contain Aroclors 1260 and 1268 at concentrations as high as 5,500 mg/kg and 35,000 mg/kg, respectively (Benchmark, 2003). Lower PCB concentrations have been detected in roofing
materials, sealant, and wall materials. As a consequence, the Department of the Navy (“DoN”) has conducted a Time-Critical Removal Action (“TCRA”) to limit the migration of contaminants present within the Hangar 1 building
materials. The scope of the TCRA Work Plan included coating the entire exterior of Hanger 1 with a specialized surface coating. The new surface coating stabilizes the existing paint (which contains elevated concentrations of lead) and surface
materials until a final remedial option is selected and implemented (Foster Wheeler, 2003). 
  

	 	2.6.4.	Other Hazardous Materials and Hazardous Waste  

 In 2003, NASA conducted an Environmental Functional
Review to review hazardous materials and hazardous waste management at its facilities, which included operations within the NRP. The self-assessment consisted of interviews, site visits, and review of available records. NASA also prepared an
inventory of hazardous waste generated since 1994 (Harding, 2000a) when NAS Moffett Field was transferred from the Navy to NASA. A list of buildings where hazardous materials were managed or hazardous wastes generated during the period 1994-2000 is
included in the EBS Reports prepared by Harding (Harding, 2000a, 2001a, 2001c, 2001b). In addition, the EBS Reports also identify several existing aboveground storage tanks containing gasoline, diesel, oil, waste oil, and sodium hypochlorite that
are still in use within the NRP. The EBS Reports also include lists of former (prior to 1994) hazardous materials and hazardous waste locations that are based on previous environmental surveys conducted by the Navy or NASA prior to the transfer of
NAS Moffett Field to NASA. 
 As described in Section 2.4.1.2, NASA has prepared Closure Plans for the buildings within the NRP area. The Closure Plans
include the results of a visual survey, and a description of the facilities and hazardous materials handling and storage. Sampling is identified where necessary to assess whether a release of hazardous materials may have occurred. In addition, the
Closure Plans also cover requirements for the removal of underground storage tanks or other subsurface structures. Closure Plans that have been completed are listed in Table 2. Closure Plan soil sampling reports have been completed for Closure Plan
Area 1 (Buildings 111, 146, 958, and 952; PAI/ISSI, 2000), Closure Plan 2 Area, including Building 555 (Harding, 2001b; PAI/ISSI, 2001g), Closure Plan 3 Area (PAI/ISSI, 2001c), Closure Plan 4 Area (PAI/ISSI, 2001d), Closure Plan 5 Area (PAI/ISSI,
2001e), Closure Plan 6 Area (PAI/ISSI, 2001h), Closure Plan 7 Area, 2001j) Closure Plan 8 Area (PAI/ISSI, 2002a), Closure Plan 9 Area (PAI/ISSI, 2003a), and Closure Plan 10 Area (PAI/ISSI, 2002b). 

  
 2-20 

 3. PLANNED DEVELOPMENT OF NASA RESEARCH PARK 

NASA plans to develop a world-class center for research and learning utilizing the NRP’s unique stock of historic buildings and partnerships with local
government, academia, industry, and nonprofit organizations. To manage the planned redevelopment of the NRP, NASA would partner with one or more organizations having building rehabilitation and development expertise. NASA has developed specific
design standards for buildings and landscapes within the NRP (NASA, 2000; DMJMH+N, 2001). 
  

	3.1.	Current Land Use 

 Currently, the NRP area comprises 91 buildings totaling approximately 1.4 million
square feet, which provide office space, a motor pool complex, retail and business services, overnight accommodations, and a day-use conference and meeting center. The NRP area (see Figure 2) includes much of the center of the original naval air
station including the Shenandoah Plaza National Historic District that contains 12 buildings of historic significance with notable architecture dating back to the 1930s, and Hangar 1, the most prominent structure in the former NAS Moffett Field that
was originally constructed in 1935 to house the USS Macon Dirigible (NASA, 2000). 
  

	3.2.	Planned Land Use 

 The planned land use for ARC is described in detail in the Final Programmatic
Environmental Impact Statement (“EIS”) prepared by Design, Community, and Environment (DCE, 2002). The EIS analyzes five land use alternatives, ranging from Alternative 1, the “No Project Alternative”, to Mitigated Alternative 5,
the “Preferred Alternative”. This Preferred Alternative is summarized in Figure 2.6 of the EIS, provided for reference in Appendix B. 
 Under
Mitigated Alternative 5, the NRP Area would be developed as a collaborative research and educational campus, which may include buildings associated with research and development, education, and general administration. Alternative 5 proposes the
addition of approximately 2.1 million square feet of new educational, office, research and development space, a computer history museum, a conference center and gym, housing, and retail space in the NMI Area. It also proposes the demolition of
approximately 560,000 square feet of non-historic structures and the renovation of approximately 600,000 square feet of existing space. 
 Figure 2 of this
EIMP identifies proposed land use for the NRP Area. Within the Shenandoah Plaza Historic District (Parcels 12 —I5, and 17), buildings may be renovated and some new infill construction would be permitted, subject to historic design guidelines. A
conference center is planned that would include short-term overnight accommodations. Hangar 1 (Parcel I8) would be renovated to house Space World, an innovative learning center for math, science, and technology. The southern NRP area is designated
for occupancy by the NRP NASA partners. In this area, existing buildings would generally be demolished and a new network of roadways and utilities would be designed with appropriate areas for new construction identified (NASA, 2000). 

Dormitory-style housing or townhouses for students, faculty, and researchers as well as a childcare facility may also be constructed in the NRP area,
potentially within land-use Parcels 3 and 6. Existing buildings within Parcel 12 may be renovated for housing purposes. Potential NASA partners are currently working on conceptual plans for NRP projects as part of the NRP planning process; however,
specific design plans are not yet available. 

  
 3-1 

 In general, because of issues regarding chemicals of potential concern in soil and groundwater in the NRP area,
NASA has recommended to its potential partners that planned construction in the NRP be designed with a minimum of soil excavation (i.e., without basement or other subgrade floors). However, soil excavation and trenching is expected to occur in
conjunction with installation of utility lines, elevator shafts, and building foundations. 

  
 3-2 

 4. REVISED HUMAN HEALTH RISK ASSESSMENT AND 

DEVELOPMENT OF SOIL TARGET CONCENTRATION 

LEVELS 
 As described in Section 2, soil
and groundwater in the NRP area have been impacted by chemicals, primarily chlorinated VOCs, purgeable and extractable TPH, BTEX, and lead. Because U.S. EPA determined in October 1992 that the ROD for the MEW Site should be applied to the portion of
NAS Moffett Field that now comprises the NRP area; no formal human health risk assessment (“HHRA”) had been conducted to specifically address potential exposure to COPCs in soil and groundwater for the entire NRP area, although the Navy is
in the process of completing risk assessments for individual petroleum sites within former NAS Moffett Field as described in Section 4.3.4. Therefore, NASA engaged Harding ESE, Inc., now Mactec, Inc., to prepare a HHRA for the NRP area. 

The following sections provide (a) a general summary of the exposure pathways that are potentially associated with planned development within the NRP area
that the measures included in this EIMP are intended to mitigate; (b) a summary of the results of the NASA Revised HHRA; and (c) a summary of soil target concentration levels. 

 

	4.1.	Potential Exposure Pathways 

 Based on NASA’s planned land use for the NRP area, potential future
receptors identified in the Revised HHRA include (a) construction workers; (b) indoor workers, such as researchers, teachers, office personnel; and (c) adult and child residents in housing provided for students or employees and their families
(Mactec, 2003b). For the adult and child residents, exposures were assessed in two ways, i.e., assuming a typical 5- to 10- year residence at the Site, and assuming a 30-year residence at the Site, which is consistent with default exposure
parameters in U.S. EPA risk assessment guidance. 
 Potential future receptors may be exposed to COPCs by one or more of the following pathways: 

 

	 	•	 	inhalation of volatile chemicals from groundwater or soil; 

  

	 	•	 	dermal absorption due to direct soil and/or groundwater contact; 

  

	 	•	 	inhalation of airborne suspended soil particulates; and 

  

	 	•	 	incidental soil ingestion. 

 These pathways are described more fully below. 

VOCs are the primary COPCs found within the NRP area. VOCs in groundwater and soil can volatilize into the pore spaces within unsaturated zone soils and
migrate through the soil column and through cracks in floors into enclosed indoor spaces, where they can be inhaled by potential receptors. The migration of COPCs from the subsurface into indoor air is called “vapor intrusion”. This is the
primary potentially complete exposure pathway that could affect future indoor workers, residents, students, or visitors to the NRP. This mechanism is illustrated on Figure 8 and discussed further in Section 5.1.1. The same mechanism can also lead to
exposure 

  
 4-1 

 
to COPCs in ambient outdoor air; however, due to dilution by typical winds in the area, potential exposures are much less than in enclosed spaces. Construction workers may also be exposed to
COPCs through the inhalation pathway during soil excavation or trenching activities that may expose soil or groundwater containing COPCs directly to ambient air leading to increased volatilization of COPCs. 

Exposure to COPCs can also occur through dermal absorption due to direct contact with soil or groundwater containing COPCs. COPCs can then be absorbed through
the skin. This potentially complete exposure pathway could affect construction workers at the Site, particularly when excavation or trenching or other activities involve disturbance of the subsurface and expose workers to direct contact with soil or
groundwater containing COPCs. 
 Potential exposure through inhalation of airborne suspended soil particles can occur when the wind lifts soil particles
into ambient air that are subsequently inhaled by potential receptors. COPCs sorbed to the soil particles can be absorbed into the bloodstream when inhaled. 

Incidental ingestion of soil particles by adults and children can also occur, primarily through hand-to-mouth contact after the hand comes in contact with
soil containing COPCs. 
  

	4.2.	NRP Revised Human Health Risk Assessment 

  

	 	4.2.1.	Scope of Revised HHRA 

 Groundwater is the primary contaminated medium of concern at the Site. Exposure
to chemicals in the groundwater is primarily the result of transport of VOCs from the groundwater to the ground surface. Once at the surface, these VOCs enter the outdoor atmosphere or infiltrate the indoor building environment. The risks resulting
from potential exposure to VOC vapors were calculated using groundwater quality data and air quality data (Mactec, 2003b). The results of these calculations are summarized below in Section 4.2.2. 

Although soil containing metals, PAHs, SVOCs, PCBs, and VOCs have been detected, most of the source areas and surrounding soil have been removed. However, a
residual soil data set (i.e., representing post remediation conditions following the removal of contamination sources) was not available for the Revised HHRA. Because a soil data set representing current chemical concentrations in soil at the Site
could not be compiled, quantitative risks could not be estimated. Instead, soil target concentration levels were developed, as discussed in Section 4.3. 

The Revised HHRA evaluated potential health risks to (a) construction workers; (b) indoor workers, such as researchers, teachers, office personnel; and (c)
adult and child residents in housing provided for students or employees and their families. For the adult and child residents, exposures were assessed in two ways, i.e., assuming a typical 5- to 10-year residence at the Site, and assuming a 30-year
residence at the Site, which is consistent with default exposure parameters in U.S. EPA risk assessment guidance. 
 To provide a range of risk estimates,
two types of exposure scenarios were used in the Revised HHRA, i.e., a reasonable maximum exposure (“RME”) and a central tendency exposure (“CTE”). The RME, as defined by U.S. EPA (1989b), is the “highest exposure that is
reasonably expected to occur” and is estimated using a combination of average and upper-bound values of human exposure parameters. The CTE provides an estimate for exposure at a site by the use of average or site-related exposure parameters
(Mactec, 2003b). 

  
 4-2 

 The following chemicals were selected as COPCs for groundwater for the Site: 1,1-DCA; 1,1-DCE; 1,2-dichloroethane
(“1,2-DCA”); trans-1,2-DCE; benzene, chloroform; cis-1,2-DCE; methylene chloride; PCE; TCE; 1,4-dioxane; 1,1,1-TCA, and vinyl chloride. Analytical data for soil at NRP were not available for the Revised HHRA (see above). 

 

	 	4.2.2.	Results of Revised Human Health Risk Assessment 

 For each receptor population, estimated human health
risks were calculated (a) for each of the 90 sampling locations in the upper aquifer at the Site, based on chemical concentrations detected in groundwater samples collected from each well, and (b) for each of 14 existing buildings, based on chemical
concentrations detected in air samples collected inside and outside each building. The calculated human health risks are shown as risk isopleths on Plates 4 through 22 in the Revised HHRA (Mactec, 2003b). The risk isopleth figures for selected
populations are provided in Appendix C and include: 
  

	 	•	 	Plate 8: Indoor Worker RME Risk; 

  

	 	•	 	Plate 10: Indoor Worker RME HI; 

  

	 	•	 	Plate 16: Child Resident (10 yr) RME Risk; 

  

	 	•	 	Plate 18: Child Resident (10 yr) RME HI; 

  

	 	•	 	Plate 20: Resident (30 yr) RME Risk; 

  

	 	•	 	Plate 22: Resident, Child (6 yr) HI. 

 Each figure in Appendix C presents the estimated human health risk for
each groundwater sampling location and each building for which risks were calculated. Contours are drawn on each figure to indicate how estimated human health risks based on groundwater data vary spatially across the Site. 

Human health risks are expressed as either (a) an incremental lifetime excess cancer risk or (b) a Hazard Index (“HI”) for non-cancer adverse health
affects. Based on U.S. EPA guidance, cancer risks arc compared in the Revised HHRA to a risk management range of le (one-in-a-million) to le (one-in-ten-thousand), and the non-cancer HI is compared to a threshold level of 1.0, a level below which
there are unlikely to be adverse health affects, even for sensitive populations (Mactec, 2003b). 
 For the purpose of developing this EIMP, conclusions
from the Revised HHRA can be summarized as follows: 
  

	 	•	 	for future building occupants at the Site, results from the Revised HHRA indicate that VOC vapors may potentially migrate from groundwater to indoor air inside buildings at levels of concern, a process called
“vapor intrusion”; and 

  
 4-3 

	 	•	 	for construction workers, direct contact with groundwater containing VOCs results in estimated cancer risks and non-cancer hazards at levels of concern. 

For additional information regarding the conclusions of the Revised HHRA, see excerpted plates included in Appendix C and the full text of the Revised HHRA
(Mactec, 2003b). 
  

	4.3.	Development of Soil Target Concentration Levels 

 Soil TCLs have been developed for the NRP. The soil
TCLs will be used to determine (a) whether excavated soil can be reused as fill at the NRP and (b) whether additional soil removal should be considered at locations where potential soil contamination is observed during development, as described
further in Section 6.10. 
 Soil TCLs have been derived for COPCs that have been detected in soil from the NRP as summarized below and listed in Tables 4
and 5. 
  

	 	•	 	For chlorinated VOCs, the soil cleanup levels set in the MEW Record of Decision (“ROD”) (U.S. EPA, 1989a) will be used as TCLs for the NRP. 

 

	 	•	 	For petroleum hydrocarbons and BTEX, the cleanup levels for petroleum contamination in soil at Moffett Federal Airfield (“MFA”) negotiated by the Navy and State of California in 1994 (Tetra Tech, 1998b) will
be used as TCLs for the NRP. 

  

	 	•	 	For PCBs, the soil TCL will be 1 mg/kg as established by the DTSC for the NASA Ames Research Center (Cal/EPA, 1998) and consistent with the PCBs cleanup level promulgated in Toxic Substances Control Act
(“TSCA”) regulations (40 CFR §761) for high occupancy areas. 

  

	 	•	 	For metals, the soil TCL will be the lowest value from (a) Environmental Screening Levels (“ESLs”) for residential soils to account for potential dermal contact or incidental soil ingestion (RWQCB, 2003) or
(b) U.S. EPA PRGs for residential soil (U.S. EPA, 2002a), unless that value is less than (c) “background” concentrations for metals in soil (Mactec, 2003b), in which case the soil TCL will be the “background” value.

  

	 	•	 	For other COPCs, the lowest value from the ESLs and PRGs (see above) will be used as TCLs for the NRP. 

 Soil
managed during development of the NRP will be managed to meet TCLs. Additional discussion of the sources of information that form the basis of the soil TCLs is provided below. 

 

	 	4.3.1.	RWQCB ESLs 

 The RWQCB’s ESLs are conservative guideline concentrations developed by the RWQCB for
screening of environmental data collected at a site. According to the RWQCB, risks to human health and the environment can generally be considered to be “insignificant” at sites where concentrations do not exceed the ESLs. The ESLs shown
in Table 4 address potential dermal contact or ingestion of soil in a residential setting (RWQCB, 2003). Unlike the U.S. EPA PRGs, described below, the ESLs for volatile compounds are based in part on consideration of the vapor intrusion exposure
pathway. 

  
 4-4 

	 	4.3.2.	U.S. EPA PRGs 

 The U.S. EPA Region IX PRGs are intended to address health concerns related to direct
contact with impacted soils. The PRGs do not incorporate the vapor intrusion exposure pathway, although they do consider VOC migration into ambient (i.e., outdoor) air (U.S. EPA, 2002a). 

 

	 	4.3.3.	MEW ROD 

 As described in Section 2.4.2, U.S. EPA determined that the MEW Superfund Site ROD is
applicable to the portion of NAS Moffett Field where the NRP is located. An Endangerment Assessment (ICF-Clement, 1988) was prepared by U.S. EPA as part of the remedial investigation/feasibility study to evaluate the baseline risk for the MEW Site.
The Endangerment Assessment focused on the risk of exposure to contaminated groundwater as a drinking water supply and did not directly assess the risk due to vapor intrusion of COPCs from soil and groundwater into indoor air. 

The groundwater cleanup level established for the MEW Superfund Site in the shallow Al/A2 aquifer (or, using the nomenclature of the MEW Companies, the A1/131
aquifer) was the drinking water MCL. The soil cleanup level was developed in the MEW Site Feasibility Study through use of a simple percolation-transport model. The model was used to determine the allowable concentrations in soil based upon
transport downward into groundwater. Based upon the analysis from the model, the soil remediation level was set at 100 times the groundwater remediation level. For example, the groundwater remediation level for TCE is 5 parts per billion
(“ppb”) in water; therefore, the soil cleanup level for TCE was set at 500 ppb in soil, or 0.500 mg/kg. The MEW ROD established the site cleanup goals specifically for TCE; since TCE was the primary COPC, reaching its cleanup goal was
expected to result in cleanup of other site chemicals to their respective cleanup goals as well (U.S. EPA, 1989a). The MEW ROD was used as the basis for setting the cleanup level (0.5 mg/kg ICE; equivalent to 100 times the PCE MCL of 0.005 mg/L)
used during the Building 88 (IRP Site 18) removal action in 1994 (see Section 2.4.4.5). Table 5 shows the soil cleanup levels based on the MEW Superfund Site ROD (i.e., 100 times the drinking water MCL). 

Since the NRP is subject to the MEW Superfund Site ROD, soil managed during development of the NRP will be managed to meet at a minimum the MEW Site cleanup
levels. 
  

	 	4.3.4.	Navy Action Levels and Risk-Based Screening Levels for Petroleum Products and Constituents 

  

	 	4.3.4.1.	Action Levels for Petroleum Products and Constituents  

 As discussed in Section 2.4.2, all
IRP sites containing only petroleum and petroleum constituents were removed from the CERCLA process to be managed according to applicable state regulations. In 1994, the Cal/EPA, including the DTSC and RWQCB, and the Navy negotiated cleanup levels
(action levels) for petroleum contamination in groundwater and soil at NAS Moffett Field. The action levels were set for individual petroleum constituents for which the 

  
 4-5 

 
State of California had established risk values, and for total petroleum hydrocarbons separated into two main categories: purgeable phase TPH as gasoline (“TPH-p”) and extractable phase
TPH (“TPH-e”) as diesel fuel or JP-5 jet fuel (Tetra Tech, 1998b). Soil cleanup levels established for BTEX compounds and polynuclear aromatic compounds coincided with U.S. EPA Region IX PRGs for industrial/commercial land use (PRC,
1995c). These soil cleanup levels were used during the Operable Unit 2 — West (Building 88) remedial action in 1994. U.S. EPA has subsequently issued revised PRGs for the BTEX compounds (U.S. EPA, 2002a). Table 5 lists the soil action levels
for TPH negotiated by the Navy and Cal/EPA, as well as the U.S. EPA Region IX PRGs and RWQCB ESLs for BTEX compounds in soil for residential use. The soil action levels for TPH, as well as the revised PRGs for BTEX compounds for
industrial/commercial use, were used as soil target screening levels during . soil excavation and trenching activities associated with the 1998 installation of the discharge and conveyance pipeline for the MEW Companies GWTS located within the NRP
area (Locus, 1998). 
  

	 	4.3.4.2.	Current Approach to Assessment of Former NAS Moffett Field Petroleum Sites 

 The State of
California’s philosophy for corrective action at petroleum sites changed significantly when the State Water Resources Control Board (“SWRCB”) revised its policy for petroleum sites in 1995. This change was made in part due to the
findings of a study that concluded that petroleum hydrocarbon contaminant residual levels tend to degrade naturally once the source (nonaqueous phase product) has been removed. Under the new SWRCB policy, as adopted by the RWQCB, once the source is
removed, sites with residual levels of soil or groundwater concentration do not require active remediation if they do not pose unacceptable risks and the preferred remedial alternative is natural bioremediation. It was recommended that the RBCA risk
assessment method (ASTM, 1995) be used to evaluate risks to human health (Tetra Tech 1998b). 
 In 1996, the Navy and RWQCB agreed to an approach to
applying RBCA to petroleum sites at the former NAS Moffett Field. In 1998, the Navy submitted the Final Basewide Petroleum Site Evaluation Methodology Technical Memorandum (Tetra Tech 1998b) that described the evaluation process to be applied
and summarized information applicable to the entire NAS Moffett Field site. The Navy is now in the process of preparing technical memoranda as appendices to the 1998 document that summarize site-specific data and risk assessments conducted for the
MFA petroleum sites. Several of the risk assessments for petroleum sites within the NRP area have been completed or are currently being prepared. 
  

	 	4.3.4.3.	Navy Risk Assessment of Former NAS Moffett Field Petroleum Site 9 

 As discussed in Section
2.4.5.2, soil and groundwater in the vicinity of the old fuel farm (Building 29) and the old Naval Exchange gasoline station (Building 31) have been impacted by TPH and BTEX compounds. The Navy has conducted Tier 1 and Tier 2 RBCA screening
evaluations for the Building 29 and 31 areas. In the Tier 1 screening evaluation, risk-based screening levels (“RBSLs”) were calculated using standard U.S. EPA default exposure parameters for an occupational and construction worker soil
exposure scenario and standard default assumptions in the DTSC version of the Johnson and Ettinger vapor intrusion model for an indoor air vapor intrusion exposure scenario for indoor workers. A comparison was made

  
 4-6 

 
between maximum concentrations of COPCs in soil and groundwater found within Site 9 and the Tier 1 RBSLs; the maximum concentrations in soil and groundwater exceeded the Tier 1 RBSLs for the
indoor worker vapor intrusion exposure scenario (Tetra Tech, 2003b). 
 Tier 2 RBSLs were subsequently developed for this scenario using assumptions based
on site-specific data and compared to maximum soil and groundwater concentrations. The maximum soil concentration for benzene was found to exceed the Tier 2 RBSL, so further evaluation was conducted. Exposure point concentrations were developed
separately for the Building 29 and Building 31 areas based on the calculated 95 percent upper confidence limit of the arithmetic mean concentration for each chemical within the area in question. The Tier 2 RBSLs were compared to the calculated
exposure point concentrations. The additional evaluation resulted in a calculated excess cancer risk for indoor workers from volatilization of benzene from subsurface soil of 2 x 10’7 for the Building 29 area; for the Building 31 area, the
excess cancer risk was calculated to be 8x10-6. While the calculated risk level for the Building 31 area is above the 1x10-6 target risk level for which the RBSLs were calculated, it is within the IO-4 to 10’6 target range for acceptable risks
used by U.S. EPA at Superfund sites. Although NASA has established 10’6 as the acceptable risk level, the Navy has recommended no further action be taken for the Site 9 petroleum site. A draft report summarizing the risk assessment has been
submitted to the RWQCB for review (Tetra Tech, 2003b). 
 The RBSLs calculated for Petroleum Site 9 for the vapor intrusion indoor exposure scenario using
the Johnson and Ettinger model are lower than the U.S. EPA Region IX PRGs that are calculated for an occupational direct contact exposure scenario and outdoor inhalation. The calculated Tier 2 RBSL for benzene in a vapor intrusion exposure scenario
for Petroleum Site 9 was 0.15 mg/kg, which is lower than the U.S. EPA Region IX PRG for benzene of 0.6 mg/kg. 
  

	 	4.3.5.	Background Metals Concentrations  

 Background metals concentrations in soil were obtained from the
Revised HHRA (Mactec, 2003b) and are listed in Table 4. These values are selected as the TCLs for metals when the background concentration is higher than other levels listed in the table. 

 

	4.4.	Risk Goals for NRP 

 During and after development of the NRP, NASA’s goal is to achieve an estimated
cumulative lifetime excess cancer risk from vapor intrusion and direct contact with groundwater of less than 1x10.6 and HI of less than 1 for all potential receptors including construction workers, indoor workers and residents using the RME exposure
parameters. Measures for achieving these goals are discussed in Sections 5, 6 and 7 of the EIMP. 

  
 4-7 

 5. RISK MANAGEMENT DESIGN CONSIDERATIONS TOR NEW 

CONSTRUCTION AND EXISTING BUILDINGS 
 New
buildings and utilities that are installed as part of redevelopment can be constructed with mitigation measures that will assist in limiting exposures to chemicals in soil and groundwater, and in limiting future migration of groundwater containing
chemicals of concern. In some cases, the integration of mitigation measures into the new construction can increase effectiveness and reduce costs,. as compared to adding mitigation measures to existing facilities. Mitigation measures that are
required in new construction at the Site are described in the Sections 5.1 through 5.3. 
 Certain existing buildings are located in areas of potential
vapor intrusion. The need for potential vapor mitigation in existing buildings, and potential vapor intrusion mitigation measures that may be appropriate in those buildings, are discussed in Section 5.1. For additional environmental information
specific to existing buildings, refer to the EBS Reports (Harding, 2000a; 2001 a; 2001b). 
 In addition, as described previously, the Navy and MEW
Companies have constructed and are currently operating groundwater remediation systems within the NRP. Redevelopment of the NRP must be conducted in a manner that allows for the continued operation of these remediation systems. Section 5.4 describes
procedures that must be followed to coordinate development activities within the NRP with the Navy and MEW Companies’ existing remediation systems. 

NASA will notify U.S. EPA regarding significant redevelopment and construction activities. 

 

	5.1.	Measures to Address VOC Vapor Intrusion into New Construction and Existing Buildings 

 As described in
Section 4.1 and the Revised HHRA for the Site (Mactec, 2003b), a potentially complete exposure pathway for indoor workers and residents in some areas of the NRP is the migration of VOCs from the subsurface into overlying buildings where occupants
could be exposed to VOC vapors through inhalation of indoor air. The process of VOC migration in the vapor phase from the subsurface to indoor air is termed “vapor intrusion”. For future construction at the Site and for existing buildings,
mitigation measures will be required to reduce vapor intrusion to the extent needed to achieve the risk goals described in Section 4. 
  

	 	5.1.1.	The Vapor Intrusion Process 

 The vapor intrusion process occurs through several chemical transport
processes, as summarized below. A generalized illustration of the vapor intrusion process is shown on Figure 8. 
 The vapor intrusion process begins when
VOCs in soil or groundwater volatilize into soil gas in the subsurface. The degree to which VOCs volatilize into soil gas depends on the chemical properties, i.e., VOCs with higher vapor pressures, lower water solubilities, and less tendency to
adsorb to soil particles tend to partition into soil gas more readily than other VOCs. Chlorinated solvents such as those found in groundwater at the NRP readily partition into soil gas. 

  
 5-1 

 Once in the soil gas, VOCs may migrate upwards or laterally by both diffusion and convection. In general, VOCs
diffuse more readily in drier, granular soil than in wetter, clayey and silty soil. Diffusion is a relatively slow transport process as compared to convection, which occurs when soil gases containing the VOCs are drawn to the surface by pressure
gradients. Pressure gradients can be caused by barometric pressure changes, as well as the reduced pressure that occurs inside many buildings, as discussed below. 

After VOCs in soil gas migrate to the area directly beneath a building (e.g., the baserock beneath the floor slab), vapor intrusion into the building can
occur. Soil gases containing VOCs may migrate into the building by diffusing through cracks in the floor. Soil gases may also be swept into the building through cracks in the floor by convective flow, driven by a lower pressure inside the building.
Lower pressures inside of buildings are sometimes referred to as the “stack effect”. The stack effect can be caused by: 
  

	 	•	 	warmer air inside the building, which tends to rise and draw in air from the lower parts of the building; 

  

	 	•	 	wind, which tends to impart a lower pressure inside the building; 

  

	 	•	 	appliance exhausts, which tend to draw air into the building and lower the interior pressure; and 

  

	 	•	 	active ventilation systems that exhaust outside the building and induce a slight negative pressure inside the building. 

Considering the mechanisms of vapor intrusion, vapor intrusion prevention or mitigation tends to be based on (a) eliminating soil gas flow into the building
by creating either a lower pressure (slight vacuum) beneath the floor of the building, or a higher pressure inside the building, (b) preventing VOCs from migrating to the area beneath the building floor, using barriers or source removal, and/or (c)
sealing cracks and penetrations in the floor through which vapor intrusion might otherwise occur: 
  

	 	5.1.2.	Vapor Intrusion Mitigation Area 

 A “Vapor Intrusion Mitigation Area” for the Site is shown on
Figure 9. The Vapor Intrusion Mitigation Area: 
  

	 	•	 	is generally defined based on the 5 ug/L isoconcentration contour for TCE in groundwater at the Site (see Figure 4 and Figure 9); and 

 

	 	•	 	includes most of the Site, including all areas of the Site where the estimated cumulative lifetime cancer risk under the RME exposure parameters exceeds 10-6 for indoor workers and residents, as described in the Revised
HHRA (Mactec, 2003b) and as shown on Plates 8, 12, 16 and 20 in Appendix C. 

 The basis for establishing the Vapor Intrusion Mitigation Area
based on 5 ug/L TCE in groundwater is discussed in Section 5.1.2.1, below. 

  
 5-2 

 For new and existing buildings within the Vapor Intrusion Mitigation Area, the developer must implement active
vapor intrusion mitigation measures consisting of: 
  

	 	•	 	active sub-slab depressurization (“SSD”) (Section 5.1.3.2); 

  

	 	•	 	continuous positive-pressure ventilation (“PPV”) (Section 5.1.3.3); 

  

	 	•	 	ground level open-air or mechanically-ventilated parking garages beneath all occupied spaces (Section 5.1.3.4); or 

  

	 	•	 	sub-membrane depressurization (“SMD”) for buildings constructed over a crawl space (Section 5.1.3.5). 

However, vapor intrusion mitigation as described above is not required if one of the two following conditions is met: 

 

	 	•	 	the developer performs its own risk assessment (which must be approved by NASA, U.S. EPA, and RWQCB) that: 

  

	 	•	 	incorporates groundwater or other data (e.g., indoor air data) available at the time of development, 

  

	 	•	 	considers actual planned land use and site-specific conditions, and 

  

	 	•	 	demonstrates that the cancer risk and HI goals described above are met; or 

  

	 	•	 	the developer proposes an alternative vapor intrusion mitigation measure in a design report demonstrating how the alternative measure will effectively mitigate the vapor mitigation pathway such that the cancer risk and
hazard index goals are met. Such demonstrations will require written approval by NASA and U.S. EPA. 

 If the project developer selects a
mitigation measure other than that listed above, the project developer must prepare a design report to demonstrate how the alternative measure will meet the cancer risk and HI goals described above. This design report shall include a description of
how the developer could respond to a change of conditions (e.g., groundwater extraction is terminated) such that additional vapor migration mitigation measures could be provided in the future. 

 

	 	5.1.2.1.	Evaluation of Vapor Intrusion at 5 ug/L TCE in Groundwater 

 There is considerable
uncertainty in predicting indoor air concentrations of VOCs that can be attributed to VOC vapor intrusion from soil and groundwater, as discussed in U.S. EPA vapor intrusion guidance (U.S. EPA, 2002b) and as discussed in the Revised HHRA (Mactec,
2003b). As also discussed in the Revised HHRA, there is considerable uncertainty in the source of VOCs detected in the air samples that have been collected in buildings at the Site, i.e., whether those VOCs should be attributed to (a) vapor
intrusion from soil or groundwater, (b) VOCs occurring in ambient air in the general vicinity of the Site, (c) VOCs attributed to vehicle emissions from nearby Highway 101 or (d) VOCs from sources inside the buildings, such as commercial products or
dry-cleaned clothing. 

  
 5-3 

 Given the uncertainties in predicting and measuring the magnitude of vapor intrusion, the Vapor Intrusion
Mitigation Area shown on Figure 9 is based on areas of the Site where the TCE concentration in groundwater exceeds 5 ug/L. This section provides additional information regarding the use of 5 ug/L TCE as the primary means of determining the Vapor
Intrusion Mitigation Area on Figure 9. 
 The concentration of a chemical in indoor air resulting from vapor intrusion can be related to its concentration
in soil vapor or groundwater beneath the building using an “attenuation factor” as defined in Equation [1]. 
  

 

	Equation [1]	Attenuation Factor for Vapor Intrusion from Soil Vapor or Groundwater to Indoor Air (as used in U.S. EPA, 2002b) 

 
  
 

 
 where: 
  

					
	 a
	 	=	  	attenuation factor (unitless)
	 Cia
	 	=	  	chemical vapor concentration in indoor air (ug/m3)
	 Csw
	 	=	  	chemical vapor concentration in soil vapor at groundwater interface (ug/m3)
	 Cgw
	 	=	  	chemical concentration in groundwater (ug/L)
	 H
	 	=	  	Henry’s Law constant for chemical at the groundwater temperature (unitless)

 As defined above, attenuation factors are always less than I, and a higher attenuation factor indicates a higher magnitude of
chemical vapor intrusion from groundwater (i.e., higher human health risk). 
 For residential land use, the U.S EPA Region IX PRG for indoor air is 0.017
micrograms per cubic meter (“ug/m3”), i.e., based on an RME exposure scenario, 10-6 lifetime excess cancer risk, and assuming a
30-year residential exposure duration (U.S. EPA, 2002a).12 For comparison, the estimated equilibrium concentration of TCE in soil vapor above
groundwater containing 5 ug/L 
  
  

	1 	The EPA PRG for indoor air is also based on draft guidance for the TCE cancer slope factor. Alternatively, using the TCE cancer slope factor currently recommended by Cal/EPA (RWQCB, 2003) would result in a PRG of 0.96
ug/m3, or approximately 56 times higher (i.e., less stringent). Ambient air in the vicinity of the Site contains on the order of 0.1 ug/m3 TCE (Locus, 2003), i.e., exceeding the U.S. EPA PRG. 

	2 	 For comparison, using standard commercial exposure parameters (i.e., 250 days per year for 25 years), the U.S.
EPA PRG would be 0.029 ug/m3. 

  
 5-4 

 
TCE is approximately 1,900 ug/m3, assuming a unitless Henry’s Law constant of 0.38 for
TCE.3 As such, to attain the U.S. EPA PRG in indoor air at a property with 5 ug/L TCE in groundwater requires that the indoor air concentration be approximately 100,000 times lower than the soil
vapor concentration, i.e., an “attenuation factor,” as defined above, of approximately 10-5. 

For comparison, the U.S. EPA prepared an evaluation of measured attenuation factors for groundwater to indoor air in Appendix F of U.S. EPA (2002b). The U.S.
EPA found most measured attenuation factors for vapor intrusion from groundwater to indoor air were in the range of 10-3 to 10-5, with
approximately 75% of the measured attenuation factors exceeding 10-5, and 25% of the measured attenuation factors lower than 10-5. In its guidance, U.S. EPA sets the screening level for TCE in
groundwater, based on vapor intrusion concerns, at 5 ug/L. 
 As another point of comparison, the RWQCB’s ESLs for TCE in groundwater at residential
land use sites, based on vapor intrusion concerns, are 530 ug/L (at sites with high soil permeability) and 2,100 ug/L (at sites with low/moderate soil permeability) (RWQCB, 2003). Since the RWQCB uses an indoor air target level of 1.2 ug/m3 (i.e., higher than the U.S. EPA PRG of 0.017 ug/m3) RWQCB has effectively used an attenuation factor of 6 x 10-6 in its calculations for TCE at sites with high soil permeability, and 2 x 10-6 for sites with low/moderate soil permeability. 

The tables in Appendix E of the Revised HHRA (Mactec, 2003b) indicate that the vapor intrusion model and the parameters used for modeling vapor intrusion of
TCE from groundwater at the Site result in an attenuation factor of approximately 10-6 for TCE. Using the 5 ug/L TCE criterion, which is equivalent to an attenuation factor of approximately 10-5 as discussed above, is therefore more conservative by approximately one order of magnitude than the Site-specific modeling results suggest is necessary. However, several uncertainties in the site
specific modeling and indoor air monitoring data suggest that vapor intrusion could potentially be occurring at levels higher than predicted in the site specific modeling (Mactec, 2003b). 

The comparisons above indicate a vapor intrusion attenuation factor of 10-5, which equates to the 5 ug/L
TCE criterion in groundwater and the U.S. EPA’s indoor air PRG of 0.17 ug/m3: 
  

	 	•	 	is in the lower (less conservative) portion of the range of measured attenuation factors as reported by U.S. EPA (2002b); 

  

	 	•	 	is slightly higher (more conservative) than attenuation factors used by RWQCB for TCE (RWQCB, 2003); and 

  

	 	•	 	is approximately an order of magnitude higher (more conservative) than modeled for TCE in the Revised HHRA for the Site (Mactec, 2003b). 

 
  

	3 	The Henry’s Law constant of 0.38 is based on values presented in the HHRA, including an assumed groundwater temperature of 22.8 degrees Celsius (Mactec, 2003b) 

  
 5-5 

	 	5.1.2.2.	Conservative Nature of 5 ug/L TCE Criterion 

 Considering the discussion in Section 5.1.2.1 and
results from the Revised HHRA, a TCE concentration of 5 ug/L in groundwater is considered a conservative screening value for vapor intrusion concerns. This EIMP requires vapor intrusion mitigation when the TCE concentration exceeds 5 ug/L in
groundwater because it is plausible that vapor intrusion could potentially result in TCE in indoor air at a concentration of concern. However, the actual magnitude of vapor intrusion into any given building will be determined by a number of
factors, such as: 
  

	 	•	 	soil properties such as moisture content (i.e., high moisture content in soil can substantially reduce the magnitude of vapor intrusion); and 

 

	 	•	 	building properties, such as the condition of the foundation or floor, characteristics of the ventilation system, and the number of utility penetrations through the floor. 

As such, it is also plausible that TCE can occur at concentrations substantially exceeding 5 ug/L in groundwater beneath a building without presenting a vapor
intrusion concern. 
 Given the uncertainties in future building construction and maintenance, the 5 ug/L TCE criterion for vapor intrusion mitigation is
likely to be conservative for some buildings at NRP, but is selected in an abundance of caution to be protective of buildings that may otherwise be constructed in a manner or at a location that may be conducive to the vapor intrusion process. 

 

	 	5.1.3.	Vapor Intrusion Mitigation Measures 

 In areas where vapor intrusion mitigation is required
pursuant to Section 5.1.2, vapor intrusion mitigation measures may be selected and designed by the developer based on consideration of the type of construction and the degree to which vapor intrusion is a concern at the location of the new
construction. Guidance on the selection and design of vapor intrusion mitigation systems is provided below. An evaluation of preliminary regulatory issues and costs for potential vapor intrusion mitigation measures is provided in EKI (2004). 

 

	 	5.1.3.1.	Design Guidance for Vapor Intrusion Mitigation 

 Much of the design guidance for vapor
intrusion mitigation has been developed for the radon control industry. The intrusion of radon gas into buildings occurs by similar processes as the VOC vapor intrusion process (see Section 5.1.1), with the exception that radon gas is naturally
occurring in soil gas at some properties. Therefore, measures designed to mitigate radon gas intrusion into buildings can be considered for mitigating VOC vapor intrusion. 

Although not intended to be a complete list, design guidance for VOC vapor intrusion mitigation may be found in the following sources, most of which are based
on radon control: 
  

	 	•	 	Radon Prevention in the Design and Construction of Schools and Other Large Buildings, Third Printing with Addendum, U.S. EPA, Office of Research and Development, EPA/625/R-92/016, June 1994. 

  
 5-6 

	 	•	 	Radon-Resistant Construction Techniques for New Residential Construction, Technical Guidance, U.S. EPA, Office of Research and Development, EPA/625/2-91/032, February 1991. . 

 

	 	•	 	Radon Reduction Techniques for Existing Detached Houses, Technical Guidance, (Third Edition) for Active Soil Depressurization Systems, U.S. EPA, Office of Research and Development, EPA/625/R-93/011, October 1993.

  

	 	•	 	Radon Mitigation Standards, U.S. EPA, Air and Radiation, EPA 402-R-93-078, October 1993 (Revised April 1994). 

  

	 	•	 	Guidance for the Design, Installation, and Operation of Sub-Slab Depressurization Systems, Thomas DiPersio and John Fitzgerald, Massachusetts Department of Environmental Protection, Northeast Regional Office,
December 1995. 

 The design guidance listed above may be considered in the selection and design of vapor intrusion mitigation systems, but is
not mandatory. Other design criteria and guidance may be appropriate. 
 Potential vapor intrusion mitigation alternatives are described in the following
sections. 
  

	 	5.1.3.2.	Active Sub-Slab Depressurization (SSD)  

 A generalized illustration of an active SSD
system is shown on Figure 10. An active SSD system typically consists of a blower and sub-slab air intake piping system. The SSD system is operated continuously to create a slight vacuum beneath the concrete floor slab of the building. The induced
vacuum beneath the building floor slab overcomes the lower pressure that is sometimes found inside buildings. Therefore, when the SSD system is in operation, soil gases generally cannot flow from beneath the floor slab into the building. Rather, at
the location of any cracks on the floor, indoor air will be drawn from inside the building into the lower pressure zone beneath the floor slab, thereby mitigating the vapor intrusion process. 

An SSD system requires installation of a vent intake pipe in one or more central or other appropriately selected location(s) in the baserock layer beneath a
concrete floor slab. As an alternative, a geocomposite drainage mat or other liner with lateral permeability can be installed beneath the building and used as the means for withdrawing air from beneath the entire floor area. The vent pipe or
drainage mat is connected to a blower to continuously create ventilation and a slight vacuum beneath the floor slab. The vacuum level created beneath the floor must be at a level sufficient to overcome the anticipated vacuum level inside the
building (see design guidance documents listed in Section 5.1.3.1). The air and soil gases withdrawn from beneath a building during SSD operation are exhausted to the atmosphere. The emissions from the SSD systems will be treated to remove VOCs to
the extent required by the Bay Area Air Quality Management District (“BAAQMD”) based on the estimated VOC emission rate for each system.4 

 
  

	4 	 For an SSD system at a nearby residential property on a former GTE site in Mountain View, California, treatment
of SSD emissions was not required by BAAQMD due to low TCE emission rates relative to BAAQMD standards (U.S. EPA, 2004). 

  
 5-7 

	 	5.1.3.3.	Continuous Positive-Pressure Ventilation (PPV) 

 Vapor intrusion primarily occurs when there is a
lower pressure inside the building, i.e., causing soil gas to flow into a building through cracks in the floor (U.S. EPA, 2002b). As such, the vapor intrusion process may be mitigated by creating a positive pressure (i.e., a pressure slightly higher
than the outside air pressure) inside the building. When there is a positive pressure inside a building, air inside the building will flow outward through any cracks in the floor, i.e., toward the lower outdoor pressure. The U.S. EPA recognizes this
in its vapor intrusion guidance, indicating: 
 “A building may be positively pressurized as an inherent design of the heating,
ventilation, and air conditioning system. It may be possible to show that the [vapor intrusion] pathway, in this case, is incomplete, at the current time, by demonstrating a significant pressure differential from the building to the
atmosphere.” (U.S. EPA, 2002b) 
 Similarly, the California Building Code (“CBC”), Section 1202.2.7, requires positive pressure
ventilation in ticket booths and other occupied spaces inside of parking garages. The purpose in that case is to prevent fumes from the parking garage from entering those spaces, i.e., to mitigate vapor intrusion from the parking garage into those
occupied spaces. 
 Positive-pressure ventilation is effectively the same as active SSD (Section 5.1.3.2) in that both methods use an air pressure gradient
to mitigate vapor intrusion routes. However, the effectiveness of PPV is dependent on proper operation and maintenance of the building ventilation system to maintain continuous positive pressure inside the building. 

Positive-pressure ventilation involves designing the building’s ventilation system to continuously impart a slight positive pressure inside the lowest
floor of the building relative to the pressure below the floor slab. The mechanical ventilation systems in commercial buildings are often designed to operate with a slight positive pressure inside the building. However, for energy efficiency, such
systems are also commonly turned off during non-working hours, potentially allowing for some vapor intrusion during time periods when the system is not operating. At the Site, for buildings where vapor intrusion mitigation is provided by PPV, the
PPV system must be continuously operated in the lowest level of the building, i.e., 24 hours per day and 7 days per week, excepting for periodic shutdowns for normal maintenance. Heating and cooling conditions may be adjusted during non-working
hours as long as the fan operation continues to impart the positive pressure to the building interior. 
 VOC vapors migrating from groundwater may tend to
accumulate in soil gas beneath a building that is operated using PPV. As such, it is recommended that passive ventilation be installed 
  

  
 5-8 

 
beneath buildings designed for PPV. The passive ventilation could be installed in the same manner as the sub-slab infrastructure for an active SSD system, i.e., perforated vent pipes in the
sub-slab base rock with a header vent pipe plumbed to outside the building, but without the SSD blower. The passive ventilation system would provide a means for VOC vapors to migrate from the sub-slab area to outside the building to reduce potential
vapor accumulation beneath the building. The passive ventilation system could also be converted to an active SSD system (i.e., by the addition of the SSD blower) in the event the building use is changed in the future such that continuous PPV is
rendered infeasible or impractical. 
  

	 	5.1.3.4.	Ventilated Parking Garage Construction  

 Vapor intrusion into buildings can be mitigated
using ventilated parking garage construction at ground level beneath the occupied residential, education or commercial space, as discussed below. 

Specific requirements for ventilation of parking garages are identified in Sections 1202.2.7 and 311.9.2.2 of the CBC (CBC, 2001), and other comparable, local
building codes. Under requirements such as these, above ground parking garages can be ventilated using either openings to the atmosphere or mechanical systems to draw in fresh air and to exhaust fumes. The purpose of these systems is to provide
adequate ventilation of car exhausts that are generated within the garage. These systems can be utilized to mitigate vapor migration from chemically impacted groundwater at the Site into overlying indoor living/working spaces, as described below.

 For parking garages that are constructed on or above ground level without mechanical ventilation, the primary driving force for vapor intrusion,
i.e., the lower pressure inside of buildings, is removed. In these cases, the air pressure inside the parking garage will be essentially the same as outside barometric pressure, and the vapor intrusion flux of VOCs into the parking garage would be
driven primarily by diffusion through cracks in the floor, a process significantly slower than the pressure-driven flux considered in the Revised HHRA. In addition, the natural ventilation in the parking garage would serve to reduce the
concentrations of any VOCs that do migrate into the parking garage. 
 Section 1202.2.7 of the CBC describes alternative requirements for ventilating
garages using mechanical ventilation systems: 
  

	 	•	 	1.5 cubic feet per minute (“cfm”) of fresh air ventilation per square foot (“sr) of parking garage floor; 

  

	 	•	 	14,000 cfm of fresh air ventilation per operating vehicle; or 

  

	 	•	 	ventilation adequate to maintain an average carbon monoxide level of 50 parts per million (“ppm”) over an 8-hour period, not to exceed 200 ppm over any one-hour period. 

Consistent with these CBC requirements, the ventilation system for each parking garage at the Site that will also serve as vapor intrusion mitigation will be
designed with a capacity of at least 1.5 cfm/sf. Operation of the ventilation system in the lowest level of the parking garage will not 

  
 5-9 

 
be modulated based on either (a) 14,000 cfm per operating vehicle or (b) carbon monoxide levels, as allowed by the CBC (see above). Rather, the systems will be designed to operate at a
ventilation rate of 1.5 cfm/sf, 24 hours a day, seven days a week. 
 Parking garages at the Site will also be designed to minimize the negative pressure
that may be induced inside the parking garage by the ventilation systems. Maintaining the parking garages near atmospheric pressure will reduce the potential for advective flow of subsurface vapors into the parking garage, and will be accomplished
by (a) maximizing open area at the perimeter of the garage, and (b) distributing the ventilation system intakes around the garage. 
 In summary, the
potential for vapor intrusion into parking garages at the Site, and the magnitude of any vapor intrusion that may occur, will be mitigated by the parking garages in two ways: 
  

	 	•	 	air pressure in the parking garage will be at or very near ambient pressure due to the openings at the perimeter of the parking garage, thereby substantially reducing the pressure driving force for vapor intrusion; and

  

	 	•	 	ventilation in the parking garage will provide substantial reductions in concentrations of any VOCs that may migrate into the parking garage. 

While it is possible that air in the parking garages will enter overlying occupied spaces (i.e., vapor intrusion), (a) VOC levels in the parking garages
resulting from vapor intrusion from groundwater may be acceptable for occupied spaces due to the vapor intrusion mitigation provided by the parking garage, as described above, and (b) further reductions in VOC concentrations would be expected in the
overlying occupied spaces (e.g., residences, educational facilities) due to fresh air ventilation in those spaces. 
  

	 	5.1.3.5.	Sub-Membrane Depressurization (SMD) for Crawl Spaces 

 For any future buildings in the Vapor
Intrusion Mitigation Area constructed over a crawl space, vapor intrusion mitigation will be provided using either sub-membrane depressurization (“SMD”) or continuous PPV (Section 5.1.3.3). 

For SMD, a membrane is placed over the dirt at the base of the crawl space. The membrane may be a flexible liner, such as high-density polyethylene
(“HDPE”), a layer of asphalt or concrete, or another durable membrane material. Air is withdrawn from beneath the membrane in a similar manner as air is withdrawn from beneath the floor of a building using SSD for vapor intrusion
mitigation (Section 5.1.3.2). Refer to guidance documents listed in Section 5.1.3.1 for further discussion of SMD. 
  

	 	5.1.3.6.	Vapor Intrusion Barrier 

 A vapor barrier may be installed beneath the floor slab to reduce the advective
flow of gases into the overlying building. However, the effectiveness of a barrier is largely dependent on the quality of the installation and long-term maintenance (i.e., prevention of punctures and tears). Air leakage may be substantial if there
are voids at seams with utility penetrations or holes in the barrier. Alternative materials for vapor intrusion barriers are described in the design guidance sources listed in Section 5.1.3.1. 

  
 5-10 

 Vapor intrusion barriers are not required by this EIMP, but may be used in conjunction with the other vapor
intrusion mitigation methods described herein. 
  

	 	5.1.3.7.	Sealing Cracks and Utility Penetrations in the Floor 

 Vapor intrusion is believed to occur
primarily through cracks and penetrations that occur in the floor that is in contact with the ground (see guidance documents listed in Section 5.1.3.1). Cracks in the concrete floor should be minimized through proper design and installation of the
concrete floor. Cracks at control joints can be sealed with flexible sealants, such as polyurethane caulk. Cracks around utility penetrations in the floor can also be avenues for vapor intrusion. Such cracks can also be sealed with flexible sealants
at the top of the concrete, and mechanical devices are available for placement around utility pipes to form a better seal with the concrete. 
  

	 	5.1.3.8.	Mitigating Vapor Intrusion in Existing Buildings 

 In the event that vapor intrusion mitigation is
required for an existing building, active SSD, continuous PPV, or active SMD can be considered for mitigation. The design guidance sources listed in Section 5.1.3.1 describes methods of retrofitting buildings with active SSD and SMD systems. 

There are existing buildings at the Site that have been constructed with basements. These buildings will be inspected for potential openings directly to
groundwater, such as sumps. Any such openings directly to groundwater will be sealed and ventilated to prevent vapor migration from the groundwater into the building. 
  

	 	5.1.4.	Design of Vapor Intrusion Mitigation Measures 

 It is the responsibility of the developer to design and
implement adequate measures to mitigate vapor intrusion into buildings in the NRP and to demonstrate that the system will effectively mitigate the vapor intrusion exposure pathway and meet the cancer risk and HI goals described in Section 4.4. The
proper design, installation, operation and maintenance of an active SSD system (Section 5.1.3.2), a continuous PPV ventilation system for the building (Section 5.1.3.3), a ventilated parking garage beneath occupied spaces (Section 5.1.3.4) or an SMD
system (Section 5.1.3.5) is considered effective mitigation of the vapor intrusion exposure pathway. Vapor intrusion barriers (Section 5.1.3.6) and sealing of cracks in the floor (Section 5.1.3.7) may also be implemented to further reduce the
potential for vapor intrusion to occur. 
 For vapor intrusion measures other than those described above and in Section 5.1.3, the developer shall submit a
design report to NASA for review and approval that describes the design of vapor intrusion mitigation measures that will be implemented and demonstrates how they will be effective in mitigating the potential vapor intrusion pathway. In addition, the
report shall also describe any system operation, maintenance, and monitoring activities that will be implemented to demonstrate and maintain the long-term effectiveness of the implemented mitigation measures. Effectiveness may be demonstrated by (a)
monitoring for VOCs in indoor air, (b) monitoring for VOCs in subslab soil gas if a barrier or sub-slab ventilation system is designed to prevent VOC accumulation below the slab, or (c) some other means that can reliably demonstrate effectiveness.

  
 5-11 

	 	5.1.5.	Monitoring Vapor Intrusion Mitigation Effectiveness 

 For vapor intrusion mitigation by an active SSD
system or a continuous PPV system, the effectiveness will be monitored by demonstrating higher air pressure inside the building as compared to outside the building. Demonstrating that pressure differential indicates the vapor intrusion exposure
pathway is incomplete, i.e., at any cracks or penetration in the floor, air will flow outward from the building to the subsurface instead of soil vapors flowing inward, as would be required for vapor intrusion to occur. Such monitoring
shall be performed quarterly to verify continued effectiveness. 
 For vapor intrusion mitigated using ventilated parking garage construction, effectiveness
will be monitored by collecting air samples inside and outside of the parking garage (at times when vehicles are not present in the parking garage). Effectiveness can be demonstrated by showing that COPC concentrations inside the parking garage are
either (a) at the same level as outside the parking garage or (b) lower than the U.S. EPA PRG for ambient air. In the event COPC concentrations inside the parking garage exceed both those values, effectiveness could be demonstrated by measuring COPC
concentrations in indoor air in the occupied spaces overlying the parking garage. The effectiveness shall be demonstrated once following construction of the parking garage while the ventilation system (if any) is operating, and again whenever there
is any substantial modification to the ventilation system. 
 For vapor intrusion mitigation by a system not described in this EIMP but approved by RWQCB,
the method of demonstrating effectiveness must also be approved by RWQCB. 
  

	5.2.	Reducing the Potential for Lateral Migration of VOCs in Utility Corridors 

 As discussed in Section
2.1.1, groundwater at the Site is typically located at approximately 5 to 12 feet below ground surface. If utilities are buried below the groundwater, it is possible that groundwater containing VOCs may migrate through utility backfill material. As
such, mitigation measures shall be utilized during installation of new utilities to reduce the potential for the lateral migration of VOCs in groundwater in utility backfill. 

Utilities most likely to be buried below the groundwater table are sanitary sewers and storm drains, although other utilities may in some cases also be buried
below the water table. If possible based on infrastructure needs and design requirements, it is preferable, from an environmental perspective, to place utilities in trenches located above the water table. 

 

	 	5.2.1.	Utilities Subject To Mitigation Measures 

 A utility is subject to the mitigation requirements in this
Section 5.2 if: 
  

	 	•	 	it is installed in a trench or horizontal borehole that extends to within two feet of the seasonal high elevation of the groundwater table; and, 

 

	 	•	 	it is located within an area of the Site where VOCs occur in groundwater above MCLs or TPH occurs in groundwater above action levels (i.e., 700 ug/L as diesel or jet fuel; 50 ug/L as gasoline)(see Section 4.3.4.1). Data
for TCE (MCL = 5 ug/L), TPH-gasoline (action level = 50 ug/L), and benzene (MCL = 1 ug/L) in groundwater are shown on Figures 4, 6, or 7. (These figures are subject to change based on the results of more recent groundwater monitoring.)

  
 5-12 

 If these conditions are met, the mitigation measures described below will be implemented. 

 

	 	5.2.2.	Measures to Mitigate Groundwater Movement in Utility Backfill 

 For utilities subject to the mitigation
requirement, as described in Section 5.2.1, mitigation measures shall include: 
  

	 	•	 	the use of low permeability backfill; and/or 

  

	 	•	 	cutoff features. 

 Low permeability backfill may include a low strength grout mix known as controlled density
fill (“CDF”), or “flowable fill”. This material is poured like grout, has low strength and therefore can be excavated by hand, and flows into gaps and around utilities. It can provide a low permeability restriction to water flow
when used as utility backfill. Other low permeability fill materials may also be used if approved by NASA. 
 If a granular backfill material is used in a
trench, a cutoff feature will be installed a minimum of every 300 feet, and within 50 feet of branches in the distribution system. The cutoff feature will be a wall of low permeability material, such as bentonite, concrete, or CDF. The cutoff
feature will be at least 2 feet thick and will span the width of the trench from the base of the trench to an elevation at least 3 feet above the highest expected groundwater level at the location. The sides of the cutoff feature shall be keyed into
native soil. 
 Some utilities subject to the mitigation requirement of this section may be installed in horizontal boreholes with no backfill. If it is
determined that the native soil will collapse around the utility, no further mitigation is required. If, however, the borehole may remain open or a granular backfill is installed around the utility line, cutoff features will be installed as
described above for trenches. This may require potholing to the borehole to install the cutoff feature, or installing plugs of low permeability material around the utility when it is installed. 

 

	 	5.2.3.	Measures to Reduce Groundwater Infiltration into Utility Pipes 

 In non-pressurized utilities buried
below the water table (e.g., sanitary sewer, storm drain), groundwater containing chemicals of concern can infiltrate into the utility line at leaky pipe joints. Such infiltration, should it occur, would cause migration of the VOCs to other areas of
the Site or off-Site, and in the case of the storm drain, to the receiving water body. Therefore, utility pipes and their joints must be designed and installed to be watertight. Butt-fused high-density polyethylene pipe shall be used for all utility
piping. Following installation, a four-hour hydrostatic leakage test or other equivalent pressure test shall be performed on each length of utility piping to confirm that the piping is watertight. 

  
 5-13 

	 	5.2.4.	Design of Utility Lines 

 If a planned utility line is subject to the mitigation requirements of this
Section (see Section 5.2.1) and the developer does not plan to use low permeability backfill and/or cutoff features (see Section 5.2.2), the developer will prepare and submit to NASA for review and approval, a design report describing the mitigation
measures that will be implemented to reduce the potential for lateral migration of COPCs in utility corridors. Use of measures other than those described in this Section 5.2 or alternate low permeability fill materials must be approved by NASA. 

 

	 	5.2.5.	Soil and Groundwater Handling During Utility Line Construction 

 Soil and groundwater handled during
construction of utility lines shall be managed as described in Sections 6.3 and 6.10. 
  

	5.3.	Reducing the Potential for Creating Conduits to Deeper Groundwater Zones During Pile or Elevator Shaft Installation 

It is possible that designs for new construction will include pile foundations or elevator shafts. Piles are commonly driven into the ground or placed in
drilled boreholes, and extend as deep as 50 to 100 feet bgs, although actual depths of piles or elevator shaft excavations that may be used for development at the NRP are not currently known. If piles or elevator shaft excavations are used in future
construction and penetrate the Al- aquifer zone underlying the NRP (i.e., 20 feet below ground surface), mitigation measures will be employed to minimize (a) the potential to drive shallow, chemically-impacted soil into deeper soils, (b) the
potential to create conduits for the migration of shallow, chemically-impacted groundwater to deeper groundwater, and (c) the potential for more highly contaminated groundwater in the A2-aquifer (the B1-aquifer under the MEW nomenclature) to migrate
upward to the Al-aquifer from which there would be greater exposure risks. 
 A permit must be obtained from the Santa Clara Valley Water District
(“SCVWD”) for any drilling or installation of elevator shafts. The SCVWD currently has no permitting requirements for the driving of piles. However, the SCVWD has a general policy regarding driven piles that would require measures to be
taken to prevent the creation of potential conduits for contaminant migration via groundwater. Therefore, SCVWD will be involved in the review of any mitigation measures proposed by the developer as described below. 

Mitigation measures may include pre-drilling through chemically-impacted soil or groundwater and using conductor casing to prevent downward or upward
migration of COPCs. Alternatively, if a geotechnical evaluation indicates that the aquitard sediments will seal around the installed piles to prevent formation of conduits, piles may be installed using a cone-shaped tip on the end of the pile to
prevent migration of soil to deeper zones. The project developer will prepare a design report for submittal to NASA and SCVWD for review and approval that describes the mitigation measures that will be implemented and demonstrates their
effectiveness in preventing downward or upward migration of COPCs. 
 Other mitigation measures that can effectively reduce the potential for driving
impacted soil deeper or creating conduits for groundwater migration may also be used if their effectiveness can be demonstrated to the satisfaction of NASA, SCVWD, and U.S. EPA. If alternate mitigation

  
 5-14 

 
measures are proposed, a design report describing the alternate measures and demonstrating their effectiveness shall be submitted to NASA, SCVWD, U.S. EPA, and RWQCB for review and approval prior
to implementation. 
  

	5.4.	Removal or Relocation/Replacement of Existing Groundwater Monitoring Wells and Remediation System Pipelines 

Both the Navy and MEW Companies currently operate groundwater remediation systems located on the NRP, as described in Section 2.4. The layout of major features
of the existing groundwater treatment systems are shown on Figure 5. Components of the remediation systems include groundwater extraction wells, single and double-contained pipelines, air relief structures, electrical power and instrumentation
conduits, fiber-optic instrument systems, electrical field control panels, leak detection systems, radio frequency communication links, settlement pin monuments, groundwater treatment systems, and a network of groundwater monitoring wells. The
location and depth of existing groundwater monitoring and extraction wells are identified in the Environmental Baseline Survey Reports prepared for the NRP (Harding 2000a; 2001 a; 2001 c). The Navy and MEW Companies are required to operate the
groundwater remediation systems on a continuous basis except for required maintenance. Therefore, consideration must be given during the design of NRP development projects to identify measures to protect the integrity of the remediation systems and
allow for their continued operation while minimizing any shutdowns of system components. 
  

	 	5.4.1.	NASA Agreements Relating to Coordination of NRP Development with the Navy and MEW Companies’ Groundwater Remediation Systems 

NASA is negotiating agreements with the Navy and the MEW Companies to outline procedures for coordination of NRP construction activities with continuing
operation of the existing groundwater remediation systems (NASA, 2001a; 2001b). Sample agreements, which are included as Appendices D and E, summarize: 
  

	 	•	 	procedures for planning and implementing remedial system modifications that may be necessary due to NRP development activities; 

  

	 	•	 	measures to be taken to protect remedial system components during construction; 

  

	 	•	 	procedures for managing soil and groundwater potentially containing COPCs that may be produced during construction excavation or trenching activities; and 

 

	 	•	 	the financial responsibility of involved parties for the cost of implementing actions necessary to coordinate NRP development activities with continued operation of the remediation systems. 

The following section describes coordination activities that must occur during design and pre-construction planning. Measures to protect remediation system
components during construction are described in Section 6.9, and procedures for managing soil and groundwater produced during construction activities are described in Sections 6.10 and 6.3.4, respectively. 

  
 5-15 

	 	5.4.2.	Pre-Construction Coordination 

 In the event that the location of existing remediation system wells and
pipelines conflicts with the Partner’s planned development, it may be possible to remove or relocate the affected well or pipeline. In identifying potential conflicts between existing remediation system components and planned development, the
following criteria will be used: 
  

	 	•	 	All wells located within 5 feet of the outer wall of a new building are considered in conflict with planned development and must be properly abandoned and relocated, if required, because they will be too difficult to
access once the building is constructed. Wells located more than 5 feet from building walls may also be considered in conflict with planned development subject to a site-specific evaluation. 

 

	 	•	 	All pipelines located within five feet of the outer edge of the footing or foundation of a new building are considered in conflict with planned development and must be removed and relocated. 

 

	 	•	 	Wells, pipelines, or other remediation system components that do not meet either criteria above, but are identified as potentially in conflict with the layout of the planned development or planned construction
activities by the project developer, for example, a monitoring well in the center of a planned roadway. 

 Relocation or removal of any
remediation system components, however, may only occur with the prior approval of the EPA and RWQCB. In addition, EPA must also approve in advance any planned shutdown of the remediation system for more than 24 hours. Coordination of any requests
for modifications to or planned shutdowns of the remediation systems will be performed by the Navy or the MEW Companies. In addition, the design and construction of any modifications to the remediation systems will be performed by the MEW
Companies’ or Navy’s contractors at the developer’s expense. A flow chart describing the preconstruction planning process for coordination with operation of the existing remediation systems is shown on Figure 11. 

To effectively coordinate the NRP site development with the operation and modification of the remediation systems, the project developer and its contractors,
NASA representatives, and contractors for the Navy and MEW Companies must be in frequent communication. The project developer, the MEW Companies, the Navy, and NASA shall each designate to one another in writing a primary and alternate single point
of contact for communication, and shall specify the methods for communication among the designated contacts (e.g., telephone numbers, email addresses, and facsimile numbers). An initial meeting among the involved parties should be scheduled as early
as possible during project planning. The Partners will be provided with detailed drawings showing the location of remedial system components in CAD form so they can be integrated into the Partner’s design plans. In addition, as the
Partner’s design and construction plans are developed, the MEW Companies’ and Navy’s contractors, and NASA must be provided with the Partner’s planned construction schedule and a full set of civil, landscaping, foundation, and
site utility plans and specifications. Updates to the project schedule, and plans and specifications must be provided promptly to the MEW Companies’ and Navy’s contractors, and NASA as they are prepared. 

  
 5-16 

 6. RISK MANAGEMENT DURING CONSTRUCTION 

Risk management during construction addresses precautions that will be taken to mitigate risks to human health and the environment from COPCs during Site
development activities in the NRP. Precautions to be taken during construction will include the following: 
  

	 	•	 	establishment of health and safety training and worker protection objectives for construction workers who may directly contact soil or groundwater containing COPCs (e.g., during site preparation, grading, foundation
construction, or landscape installation) (Section 6.2); 

  

	 	•	 	implementation of construction impact mitigation measures, including control of dust generation at the Site, decontamination of equipment, prevention of sediment from leaving the Site in storm water runoff, and
management of groundwater extracted from excavations for dewatering (Section 6.3); 

  

	 	•	 	implementation of procedures for managing asbestos-containing debris (Section 6.4) and debris containing lead-based paint (Section 6.5); 

 

	 	•	 	implementation of procedures for removing PCB-containing equipment (Section 6.6); 

  

	 	•	 	implementation of procedures for managing underground storage tanks and other subsurface structures (Sections 6.7 and 6.8); 

  

	 	•	 	implementation of procedures to protect existing groundwater monitoring wells and other remediation system components, such as pipelines (Section 6.9); and 

 

	 	•	 	establishment of procedures to characterize and manage Site soil during construction excavation and trenching activities, including procedures to follow if visibly contaminated or odorous soil is encountered during Site
development (Section 6.10). 

 Section 6.1 describes the general approach to conducting environmental sampling and treatment or disposal of
impacted soil and groundwater and other materials relating to chemical impacts (e.g., USTs or chemical containers encountered during construction) during Site development activities. The respective roles of the project developer, NASA, the Navy, and
the MEW Companies are described in this section. The roles of the various parties are further clarified in the sample Agreements between NASA and the Navy (Appendix D) and NASA, the MEW Companies, and each project developer (Appendix E). 

To ensure implementation of the Environmental Issues Management Plan during construction, the developer shall incorporate the appropriate provisions of the
Environmental Issues Management Plan into the technical specifications of construction contracts. 
  

	6.1.	General Approach for Conducting Environmental Sampling and Treatment/Disposal of Impacted Material During Site Development 

Many of the risk management measures described in Section 6 of this EIMP involve collection and analyses of soil or groundwater samples to determine
appropriate measures for handling 

  
 6-1 

 
potentially impacted soil or groundwater encountered during construction activities. In addition, the EIMP describes actions involving removal and on-Site treatment or off-site disposal of
impacted soil, groundwater, or other materials, such as underground storage tanks or sumps encountered during construction. This section describes the general approach to addressing these issues and the respective roles of NASA and the project
developer. 
  

	 	6.1.1.	Environmental Sampling 

 The EIMP describes environmental sampling of soil and groundwater that is
handled during construction activities to determine how these materials must be managed (see Sections 6.3.4 and 6.10). This sampling will be conducted in close coordination with construction activities. Additional environmental sampling may be
necessary in conjunction with the removal of tanks, sumps, containers, abandoned pipes or other subsurface structures associated with potential impacts to Site soil or groundwater (see Sections 6.7 and 6.8), or in the event that previously unknown
soil contamination is encountered during construction. 
 In general, NASA intends to conduct the environmental sampling described in the EIMP; however, in
some cases, based on project needs and schedule or staffing constraints, the project developer’s contractor may conduct such sampling with NASA’s approval and under NASA’s oversight. In this event, the project developer will be
responsible for using a qualified environmental contractor, appropriately staffed with licensed, certified, or registered environmental professionals. For each development project, NASA and the developer will agree to arrangements for conducting
necessary environmental sampling activities during Site development activities. 
  

	 	6.1.2.	Excavation or Removal of Impacted Soil or Groundwater and Other Materials Relating to Potential Chemical Impacts 

The project developer will be responsible for excavation or removal of impacted soil and groundwater that must be removed as part of Site development
activities. In addition, the project developer will also be responsible for the removal of other materials or subsurface structures associated with potential chemical impacts, such as USTs, sumps, or abandoned pipes, during Site development. 

In situations where the removal of structures, such as USTs, are subject to regulatory agency oversight, NASA will facilitate coordination with the
appropriate regulatory agencies. 
  

	 	6.1.3.	Treatment or Disposal of Impacted Soil and Groundwater, Tanks, Sumps, Abandoned Pipes or Chemical Containers 

As described in this EIMP, environmental sampling will be conducted to determine if potentially impacted soil or groundwater that is handled during Site
development activities must be treated or disposed off-site at a licensed disposal facility. 
 Impacted groundwater produced during dewatering of excavated
areas during Site development will either be discharged to the sanitary sewer system, if possible, or will be transported by the developer to either the Navy or MEW Companies’ groundwater treatment systems depending on the area from which the
groundwater was extracted and the COPCs identified in the water 

  
 6-2 

 
through environmental sampling (see Section 6.3.4). Once the developer has transported extracted groundwater to tanks next to the appropriate groundwater treatment system, the Navy or MEW
Companies will be responsible for appropriate treatment and disposal of the impacted groundwater. 
 If soil excavated during Site development activities is
determined to require treatment or off-site disposal, the Navy or MEW Companies will be responsible for the treatment and disposal of impacted soil, although NASA may operate the Navy’s soil treatment area or arrange for off-site disposal at
the Navy’s expense. Section 6.10 describes soil management protocols for determining when excavated soil requires treatment or off-site disposal, as well as for determining whether the Navy or MEW Companies are responsible for soil
treatment/disposal. The developer would be responsible for transporting impacted soil requiring treatment/disposal to the Navy or MEW Companies’ soil treatment pad, as appropriate. Once the soil has been transported to the treatment pad, the
Navy (or NASA by agreement with the Navy) or MEW Companies would operate the soil treatment process or arrange for off-site disposal. In some situations where the soil is impacted with COPCs that cannot be treated by the soil treatment process used
at the Navy soil treatment pad (e.g., lead-impacted soil), NASA may arrange (at the Navy’s expense) for the transport and off-site disposal to occur directly from the construction area after the developer has excavated impacted soil. In this
situation, the developer would not need to transport the impacted soil to the Navy soil treatment pad. 
 This EIMP also provides procedures to be used in
the event that tanks, sumps, abandoned pipes, or chemical containers (e.g., drums) are encountered during Site development activities. In general, although the developer will be responsible for excavating or removing the structure or container, as
required for Site development, disposal will be arranged by NASA at the Navy’s expense. 
  

	6.2.	Site-Specific Health And Safety Worker Planning Requirements 

 The project developer has the
responsibility to manage its operations in a safe manner and in compliance with all State and Federal occupational safety and health requirements. 
 The
project developers shall notify NASA of any operation that endangers or has the potential to endanger NASA employees or the public. NASA reserves the right to conduct oversight of the project developer’s activities to assure effective
coordination of health and safety issues and adequate protection of NASA employees and the public. 
  

	 	6.2.1.	Planning Requirements for Contractors 

 Each construction contractor with workers who may directly
contact Site soil or groundwater (e.g., during site preparation, grading, and foundation construction) will prepare its own site-specific health and safety plan (“H&SP”), consistent with State and Federal Occupational Safety and Health
Administration standards for hazardous waste operations (California Code of Regulations, Title 8, Section 5192 and 29 Code of Federal Regulations 1910.120, respectively) and any other applicable health and safety standards. Each contractor will
provide copies of its H&SP for review by the NASA/ARC Safety, Health and Medical Services Office (QH). However, the contractor maintains overall responsibility for ensuring the health and safety of its

  
 6-3 

 
workers. Among other things, the H&SPs will include a description of health and safety training requirements for on-Site personnel, a description of the level of personal protective equipment
to be used and any other applicable precautions to be undertaken to minimize direct contact with soil and groundwater. 
 Consistent with the OSHA
standards, a H&SP would not be required for contractors engaged in work such as carpentry, painting or other such work that will not disrupt the subsurface in such a manner that the contractor’s employees would encounter COPCs in
groundwater or soil. When constructed, buildings and cover materials such as roadways and walk-ways will prevent exposure to COPC-containing soil. It remains the responsibility of the project developer to determine if a health & safety plan is
required for compliance with other federal, state, or local requirements. 
 It is the responsibility of the contractor preparing the site-specific H&SP
to verify that the components of the H&SP are consistent with applicable OSHA occupational health and safety standards and currently available toxicological information. Each contractor must require its employees who may directly contact COPCs
in site groundwater or soils to perform all activities in accordance with the contractor’s H&SP. Each construction contractor will assure that its on-site construction workers will have the appropriate level of health and safety training
and will use the appropriate level of personal protective equipment, as determined in the relevant H&SP based upon the evaluated job hazards and monitoring results. 
  

	 	6.2.2.	Worker Training 

 Workers who may directly contact Site soil or groundwater will have the appropriate
level of health and safety training and will use the appropriate level of personal protective equipment, as determined in the relevant H&SP. In general, due to the presence of COPCs in soil and groundwater in the NRP, it is expected that
construction activities involving excavation of soil may constitute “clean-up operations” or “hazardous substance removal work” as defined in the OSHA standards for Hazardous Waste Operations and Emergency Response, 29 Code of
Federal Regulations 1910.120. Therefore, each construction contractor will assure that its on-site personnel conducting such activities, who may contact COPCs in subsurface soil or groundwater, have had training, and are subject to medical
surveillance, in accordance with OSHA standards (“HAZWOPER-trained personnel”). 
 In general, workers involved in soil or groundwater removal
operations or other construction activities that involve soil handling (e.g., grading) must have completed 40 hours of hazardous waste site operations (“hazwoper”) training, with annual 8-hour refresher training, as required under 29 Code
of Federal Regulations 1910.120. Exceptions can be made for certain types of work and site conditions with limited exposure levels in accordance with 29 CFR 1910.120. 
  

	 	6.2.3.	Components of the Health and Safety Plan 

 The minimum content required for all H&SPs is outlined
below. However, each H&SP shall be tailored to current site conditions, current occupational safety and health standards, and task-specific activities then known to the preparer of the H&SP. It is the responsibility of the contractor
preparing the site-specific H&SP to verify that the components of the H&SP are consistent with applicable OSHA occupational health and safety standards and currently available toxicological information. 

  
 6-4 

 General Information 

This section of the H&SP will contain general information about the site, including the location of the site, the objectives of the work that the H&SP
is intended to cover, and the name of the individual(s) who prepared the H&SP. This section will also contain a brief summary of the possible hazards associated with the soil and groundwater conditions at the site. Based on the known conditions
at the NRP, the principal hazards posed by the soils and groundwater that construction workers may encounter will be direct contact with the COPCs potentially present in soil and groundwater and inhalation of vapors from volatile COPCs or dust
containing lead. 
 Key Personnel/Health and Safety Responsibilities 

This section of the H&SP will identify the contractor’s key personnel by name and will include identification of the Project Manager, the Site
Supervisor, Site Safety Officer, and the subcontractors that will be working at the site. The contractor will provide its employees who will potentially contact groundwater or previously unidentified soil contamination a copy of the H&SP and
brief its employees as to its contents. The health and safety responsibilities of each individual worker will be described in this section of the H&SP. 

Facility/Site Background 
 This section of the
H&SP provides background information concerning past operations at the project location, the types of contaminants that may be encountered, and a brief description of the types of construction activities that the contractor will perform at the
site. The description of the construction activities will focus on those activities that will result in the movement of soil or activities that may encounter soil or groundwater contamination. This section will provide a general map showing the
portion of the project location where construction will occur, highlighting those particular areas where soil movement activities or direct contact with groundwater may occur. The types of contaminants that may be encountered during the construction
activities will be identified in the H&SP and should consider the COPCs discussed in Section 2 as appropriate to the construction site. 
 Job
Hazard Analysis/Hazard Mitigation 
 A description of the hazards associated with the specific construction activities planned will be provided in
this section of the H&SP. The description of job hazards will include potential physical hazards (e.g., hazards associated with work around heavy equipment, trenches, electrical equipment, etc.) as well as construction activities that may give
rise to contact or potential contact with COPCs in soil or groundwater or previously unidentified contamination. The hazards that will be discussed include, at a minimum, chemical, temperature, and explosion hazards, if applicable. As part of the
job hazard analysis, the H&SP will identify the chemicals likely to be encountered during the construction activities and will present a table indicating the symptoms of exposure and the relevant regulatory exposure limits for each compound
(i.e., the OSHA Permissible Exposure Limit (“PEL”)). The procedures to mitigate the hazards identified in the job hazard analysis will also be presented in this section of the H&SP. The use of appropriate engineering controls and
personal protective equipment (“PPE”) will likely be the principal mitigation procedures. 

  
 6-5 

 Air Monitoring Procedures 

Air monitoring procedures will be detailed in the H&SP. Depending on the areas of planned construction, air monitoring may include monitoring for volatile
constituents, lead, and/or respirable dust. The objectives for each are described below. 
 Air Monitoring for Volatiles 

Air monitoring for volatile constituents will be conducted in those areas where contamination is known to exist and where previously unknown contamination is
encountered during construction activities. The purpose of the air monitoring will be to verify that the workers are not exposed to levels of volatiles that exceed the OSHA PELs, the relevant occupational standards for airborne exposures. The
presence of those constituents with the lowest OSHA PELs will dictate the level of PPE that will be required. 
 Air Monitoring for
Particulates 
 Air monitoring for particulates at work area perimeters will be conducted to demonstrate that the fugitive dust generated during the
development/construction activities is not affecting the health and safety of off-site populations. Personal air monitoring for worker exposures to dust, and potentially for lead, where appropriate, will be conducted within work zones where soil is
disturbed or contacted. 
 Personal Protective Equipment 

This section of the H&SP will identify the PPE that will be used to protect workers from the identified COPCs present in groundwater or soil. Personal
protective equipment will be selected based on the known contaminants present at the work site, and the known potential route(s) of entry into the human body. The primary exposure routes include direct contact with the groundwater or soil and
inhalation of vapors. 
 Certain construction activities, such as the installation of deep utility trenches or foundations, could result in workers coming
into direct contact with COPCs in groundwater. This contact is expected to be minimal, because OSHA regulations prohibit accumulation of water in open excavations. However, limited direct contact with COPCs in groundwater could occur. In the event
that excavations are conducted in areas with shallow groundwater, the H&SP will identify any additional PPE required to minimize direct contact with COPCs in water, including water repellant gloves and boots, tyvek coveralls, etc. 

Work Zones and Site Security Measures 
 This
section of the H&SP will identify the specific work zones of the construction site and describe the site security measures, such as the placement of barricades, fencing, access control, and access logs. The work zones will be defined as the
areas of the construction site where construction workers may come into contact with COPCs in contaminated soil or groundwater. 

  
 6-6 

 
All workers within the work zone, who will have direct contact with groundwater or soil, will perform the work in compliance with relevant aspects of the H&SP. The support zone will be
located outside of the work zone, but within the boundaries of the construction site. All end-of-the day cleanup operations, such as cleaning of truck wheels (for vehicles exiting the construction site that could be tracking contaminated soils
offsite), and the removal of any PPE, will occur in the support zone. If possible, the support zone will be located in close proximity to the entry and exit point of the construction site. The entire construction site will be fenced to control
pedestrian and vehicular entry, except at controlled (gated) points. The fences will remain locked during non-construction hours. 
 Decontamination
Measures 
 This section of the H&SP will describe the specific procedures that will be used to decontaminate both equipment and personnel that
have been performing work in direct contact with soil and/or groundwater. Decontamination measures will include cleaning the wheels of all vehicles that have been in contact with soil and/or groundwater in the support zone prior to their exiting the
site. Procedures to collect and sample decon water will be described. Additionally, workers will be required to remove any contaminated PPE and place it in a designated area in the support zone prior to leaving the site. 

General Safe Work Practices 
 This section of the
H&SP will discuss the general safe work practices to be followed at the construction site, including entry restrictions, tailgate safety meetings, use of PPE, personal hygiene, hand washing facilities, eating and smoking restrictions, the use of
warning signs and barricades, precautions near heavy equipment, confined space entry, and any special precautions that may be specific to the construction site and construction worker. 

Contingency Plans/Emergency Information 
 This
section of the H&SP will provide information regarding the procedures to be followed in the event of an emergency. The location of specific emergency equipment, such as eyewash, first aid kit, and a fire extinguisher, and emergency telephone
numbers and contacts will be identified. A map indicating the route to the nearest hospital will also be provided in this section of the H&SP. 

Medical Surveillance 
 This section of the H&SP
will describe medical surveillance that would be required for certain workers. In general, due to the presence of COPCs in soil and groundwater in the NRP, it is expected that construction activities involving excavation of soil may constitute
“clean-up operations” or “hazardous substance removal work” as defined in the OSHA standards for Hazardous Waste Operations and Emergency Response, 29 CFR 1910.120. Therefore, each construction contractor will assure that its
on-site personnel conducting such activities, who may contact COPCs in subsurface soil or groundwater, have had training, and are subject to medical surveillance, in accordance with OSHA standards (“HAZWOPER-trained personnel”). 

  
 6-7 

	6.3.	Construction Impact Mitigation Measures 

 This section outlines measures that will be implemented to
mitigate potential impacts to human health and the environment during earthwork construction. Measures will be implemented to mitigate the potential impacts of the following activities: 

 

	 	•	 	dust generation associated with soil excavation and loading activities, construction or transportation equipment traveling over on-site soil, and wind traversing COPC-containing soil stockpiles; 

 

	 	•	 	tracking soil off the site with construction or transportation equipment; 

  

	 	•	 	transporting sediments from the site in surface water run-off; and 

  

	 	•	 	managing groundwater extracted while performing below-grade construction activities. 

 The mitigation measures
for these potential activities will include, but are not limited to, the following: 
  

	 	•	 	implementing dust and odor control measures (Section 6.3.1); 

  

	 	•	 	decontaminating construction and transportation equipment (Section 6.3.2); 

  

	 	•	 	implementing storm water pollution prevention plans, best management practices, and applicable controls (Section 6.3.3); and 

  

	 	•	 	sampling and analyzing extracted groundwater to determine appropriate storage and disposal practices (e.g., evaluation before its use for dust control on-site or disposal to the storm drain, to the sanitary sewer, to
on-Site groundwater treatment systems or at an appropriate off-site facility) (Section 6.3.4). 

 These mitigation measures are discussed in
more detail below. The project developer shall prepare and submit to NASA a plan describing construction mitigation measures that will be implemented during site development activities. The plan will, at a minimum, include the mitigation measures
described in Sections 6.3.1 through 6.3.4 and will describe management procedures to ensure that the mitigation measures are properly implemented during construction. 
  

	 	6.3.1.	Dust Control Measures 

 Dust control measures will be implemented during construction activities at the
project area to minimize the generation of dust. It is particularly important to minimize the exposure of on-site construction workers to dust containing COPCs and to prevent nuisance dust and dust containing COPCs from migrating off-site. Dust
generation may be associated with excavation activities, truck traffic, ambient wind traversing soil stockpiles, loading of transportation vehicles, and other earthwork. 

  
 6-8 

 Dust control measures may include the following: 

 

	 	•	 	mist or spray reclaimed water while performing excavation activities and loading transportation vehicles; 

  

	 	•	 	limit vehicle speeds on the property to 5 miles per hour; 

  

	 	•	 	control excavation activities to minimize the generation of dust; 

  

	 	•	 	minimize drop heights while loading transportation vehicles; and 

  

	 	•	 	cover with plastic sheeting or tarps any soil stockpiles generated as a result of excavating soil potentially impacted by COPCs (e.g., visibly contaminated or odorous soil or soil from areas known to contain lead-based
paint). 

 Additional dust control measures must be implemented, as necessary, especially if windy conditions persist. Required mitigation
measures for dust control are also included in the NASA Ames Development Plan, Final Programmatic Environmental Impact Statement (“NADP EIS;” DCE, 2002). 
  

	 	6.3.2.	Decontamination 

 Construction equipment and transportation vehicles that contact soil containing COPCs
within the construction site will be decontaminated prior to leaving the construction site in order to minimize the potential for this equipment to track COPC-containing soil onto roadways. 

Decontamination methods will include scraping, brushing, and/or vacuuming to remove dirt on vehicle exteriors and wheels. In the event that these dry
decontamination methods are not adequate, methods such as steam cleaning, high-pressure washing, and cleaning solutions will be used, as necessary, to thoroughly remove accumulated dirt and other materials. Wash water resulting from decontamination
activities will be collected and managed in accordance with all applicable laws and regulations. Collected wash water (containing no soap or detergent) may be filtered and managed along with construction dewatering water as described in Section
6.3.4 and shown on Figure 12. 
  

	 	6.3.3.	Storm Water Pollution Controls 

 The NRP is subject to storm water regulations enforced by the RWQCB. To
ensure that the NRP complies with these regulations, the developer’s construction activities shall conform with storm water best management practices (“BMPs”) described in the current version of the Storm Water Pollution Prevention
Plan (“SWPPP”) prepared by NASA’s Environmental Services Office. The developer shall coordinate submittal of construction plans and specifications with NASA’s Environmental Services Office. The Environmental Services Office will
review the construction plans and specifications, and determine the appropriate BMPs in the SWPPP to be implemented as part of the developer’s construction activities. The primary objectives of the BMPs are to minimize soil erosion from the
construction site(s) and to prevent contact of storm water with chemicals that may be used during construction. BMPs may include, but are not limited to the following: 
  

	 	•	 	constructing berms or erecting silt fences at entrances to the site, perimeters of work areas, or as needed to divert runoff from contacting exposed soil; 

  
 6-9 

	 	•	 	placing straw bale barriers around entrances to storm drains and catch basins; 

  

	 	•	 	during significant rainfall events, covering all soil stockpiles with plastic sheeting or tarps; 

  

	 	•	 	Protecting and/or closing storm drains located at the site during construction activities; and 

  

	 	•	 	Storing chemical products inside buildings, sheds, or beneath water repellant tarps, and refraining from applying or dispensing chemicals (e.g., paints, lacquers, solvents, diesel fuels) outside during inclement
weather. 

 The above BMPs are illustrative. It is anticipated that the developer will propose specific BMPs appropriate to the construction
plans and specifications. NASA’s Environmental Services Office will review and approve the developer’s BMPs. Unless NASA’s Environmental Services Office instructs the developer otherwise, NASA’s Environmental Services Office
shall be responsible for obtaining necessary storm water permits and providing proper notification to the RWQCB and other regulatory agencies concerning the developer’s construction project. 

Additional BMPs will also be required, as described in the NADP EIS, to protect water quality post-construction and to ensure that the quantity, rate, and
duration of storm water runoff does not increase. 
  

	 	6.3.4.	Dewatering 

 If dewatering is to be performed as part of construction activities, then the groundwater
will be sampled in planned work areas and analyzed to determine appropriate management and disposal practices. Depending on the analytical results, and with appropriate governmental agency approvals, extracted groundwater may be: 

 

	 	•	 	used for dust control on the site; 

  

	 	•	 	discharged to the storm drain; 

  

	 	•	 	discharged to the sanitary sewer; 

  

	 	•	 	discharged to the Navy’s West Side Aquifer Treatment System; 

  

	 	•	 	discharged to the MEW groundwater treatment system; or 

  

	 	•	 	transported offsite for disposal at an authorized facility. 

 Sampling, use and disposal of dewatering water
shall be performed in accordance with NASA’s agreements with the MEW Companies and the Navy described in Section 5.4.1. and included in Appendices D and E. A flow chart describing the decision process for managing dewatering

  
 6-10 

 
water is shown on Figure 12. Decisions regarding treating dewatering water are determined in part based upon the whether the dewatering location is within the Navy or MEW Companies’
allocation area at the Site, as described in Section 2.4.3 and shown in the figure included as Appendix A. 
 For uncontaminated properties, discharge of
construction dewatering water is allowed under the SWRCB National Pollutant Discharge Elimination System (“NPDES”) General Permit for Stormwater Discharges Associated with Construction Activity (General Permit) (SWRCB, Order
99-08-DWQ). The NPDES Permit requires filing a Notice of Intent form with the SWRCB and writing a SWPPP. Groundwater in portions of the NRP area as shown on Figure 9 may not contain COPCs. Dewatering water shall initially be collected and analyzed
for VOCs and TPH by EPA Methods 8260 and EPA Method 8015m. If analytical results indicate chemical concentrations are below MCLs and shallow water discharge limits in the RWQCB San Francisco Bay Basin Plan, dewatering water from construction
activity in that area may be discharged to the storm drain or used for dust control (unless new data or observations indicate the water is contaminated). 

Dependent on the chemical concentrations in the water, it may be possible to discharge dewatering water to the Sunnyvale Waste Water Treatment Plant or the
City of Palo Alto Regional Water Quality Control Plant through the NASA sanitary sewer system. Both Publicly-Owned Treatment Works (“POTW”) currently limit the concentration of Total Toxic Organics (“TTO”) in any discharge to a
maximum of 1.0 mg/L (Palo Alto, 2000; Sunnyvale, 2000). If analytical results indicate that the discharge of dewatering water would meet this limitation, the project developer’s contractor shall coordinate with the NASA Ames Environmental
Office to apply for an industrial wastewater discharge permit from the POTW providing sanitary sewer service for the area of the NRP where the discharge would occur. Most of the NRP discharges to the Sunnyvale POTW. However, certain utility lines
that extend into the Ames Campus discharge to the Palo Alto POTW. No discharge of extracted groundwater to the sanitary sewer can occur unless a Wastewater Discharge Permit is first obtained. 

If the dewatering water cannot be discharged to the sanitary sewer system, and either (a) is from the Navy allocation area (see Appendix A), or (b) contains
petroleum hydrocarbons above 50 ug/L, the water can be transported and discharged to the Navy’s WATS. The project developer will deliver the extracted groundwater to clean storage tanks that it provides at a location selected by the Navy
adjacent to the WATS. Prior to initial use, the storage tanks are to be inspected and the contents sampled by the project developer for analytical parameters specified by the Navy. Sample results will be provided to the Navy. In addition, the Navy
shall have the right to inspect the storage tanks prior to their use. The dewatering water must be filtered before it is pumped into the clean storage tanks. All solids removed from the groundwater shall be managed and disposed of in accordance with
the procedures for managing potentially contaminated soil described in Section 6.10. NASA shall be designated the generator for any solids or filter wastes shipped for off-site disposal. The Navy’s contractor will manage the treatment and
disposal of filtered groundwater through the WATS within a reasonable time-frame. 

  
 6-11 

 If the dewatering water cannot be discharged to the sanitary sewer system, and if it: 

 

	 	1)	is from the MEW Companies allocation area (see Appendix A); 

  

	 	2)	contains VOCs that are identified with the MEW plume (i.e., chloroform, 1,2-dichlorobenzene, 1,1-DCA, 1,2-DCA, 1,1-DCE, cis-1,2-DCE, trans-1,2-DCE, Freon 113 (trichlorotrifluoroethane), PCE, 1,1,1-TCA, TCE, and vinyl
chloride); and 

  

	 	3)	does not contain petroleum hydrocarbons above 50 ug/L, 

 then the water can be transported and discharged to
the MEW Companies’ Remedial System Groundwater Treatment System (“GWTS”). The project developer will deliver the extracted groundwater to clean storage tanks that it provides at a location selected by the MEW Companies adjacent to the
GWTS. Prior to initial use, the storage tanks are to be inspected and the contents sampled by the project developer for analytical parameters specified by the MEW Companies. Sample results will be provided to the MEW Companies. In addition, the MEW
Companies shall have the right to inspect the storage tanks prior to their use. The dewatering water must be filtered before it is pumped into the clean storage tanks. All solids removed from the groundwater shall be managed and disposed of in
accordance with the procedures for managing potentially contaminated soil described in Section 6.10. NASA shall be designated the generator for any solids or filter wastes shipped for off-site disposal. The MEW Companies’ contractor will manage
the treatment and disposal of filtered groundwater through the GWTS within a reasonable time-frame. 
 Dewatering water may also be transported off-site for
treatment at a permitted wastewater treatment facility, in accordance with applicable laws and regulations. The project developer shall provide NASA’s environmental office with a copy of its written permit or other permission to transport water
off-site for treatment or disposal. NASA shall be designated as the generator of the wastewater. 
  

	6.4.	Management of Asbestos Containing Debris 

 Asbestos-containing material (ACM) may be present in existing
buildings at the Site. In the event an existing building is to be demolished, the developer and its contractor shall abide by the requirements in the NASA-ARC Asbestos Management Plan (Chapter 30 of the NASA-ARC Health and Safety Manual).
Among other things, the Asbestos Management Plan requires a pre-demolition survey for the presence of ACM, and the removal and management of ACM in accordance with all applicable government regulations and with oversight by the NASA-ARC
Safety, Health & Medical Services Office. As described in Section 2.6.1, NASA has completed ACM surveys for all pre- 1998 buildings within the NRP area. The project developer shall contact the NASA-ARC Safety, Health & Medical Services
Office to obtain copies of the ACM surveys conducted for the buildings it intends to demolish or renovate. 
 All persons who manage construction or
maintenance projects, disturb, handle, store or dispose of ACM located on NASA property shall conduct operations in compliance with the Asbestos Management Plan and all applicable governing regulatory agency regulations and guidelines
pertaining to ACM. A copy of the NASA-ARC Asbestos Management Plan may be obtained from the NASA-ARC Safety, Health & Medical Services Office. 

  
 6-12 

	6.5.	Management of Debris Containing Lead-Based Paint 

 Lead-based paint has been used in existing buildings
at the NRP, and residues from lead- based paint occur in surface soil adjacent to buildings where lead-based paint was used (CWMI, 1993; Weston, 1998; Mactec, 2003a). As such, lead-containing material (“LCM”) will be encountered during
redevelopment. In the event an existing building is to be demolished, or when painted debris is encountered during development, the developer and its contractor shall abide by the requirements in the NASA-ARC Lead Management Plan (Chapter 35
of the NASA-ARC Health and Safety Manual). Among other things, the Lead Management Plan requires a pre-demolition survey for the presence of LCM, and the removal and management of LCM in accordance with all applicable government regulations
and with oversight by the NASA-ARC Safety, Health & Medical Services Office. As described in Section 2.6.2, NASA has conducted surveys for the presence of lead-based paints in all pre-1998 buildings within the NRP area. The project developer
shall contact the NASA-ARC Safety, Health & Medical Services Office to obtain copies of the lead-based paint surveys that have been conducted at buildings it intends to demolish or renovate. 

All persons who manage construction or maintenance projects, disturb, handle, store or dispose of LCM located on NASA property shall conduct operations in
compliance with the Lead Management Plan and all applicable governing regulatory agency regulations and guidelines pertaining to LCM. A copy of the NASA-ARC Lead Management Plan may be obtained from the NASA-ARC Safety, Health &
Medical Services Office. 
 Procedures for managing soil impacted by lead-based paint are discussed further in Section 6.10.1. 

 

	6.6.	Removal of PCB-Containing Equipment 

 Equipment containing PCBs may be located on sites subject to
redevelopment. In the event removal of PCB-containing equipment is to be performed during redevelopment, NASA and the developer shall abide by the requirements in NASA-ARC’s Polychlorinated Biphenyl Management policy (Chapter 9 of the
NASA Ames Environmental Management Handbook). Among other things, NASA’s Polychlorinated Biphenyl Management policy requires the removal and management of PCB-containing equipment in accordance with all applicable government regulations
and with oversight by the NASA-ARC Environmental Services Office. 
 A copy of the NASA-ARC Polychlorinated Biphenyl Management policy may be
obtained from the NASA-ARC Environmental Services Office. 
  

	6.7.	Management of Abandoned Underground Storage Tanks, Sumps, and Buried Drums and Containers 

 As described
in Section 2.5, numerous USTs and sumps are known to exist in the NRP. The status of known USTs and sumps is summarized in the EBS Reports (Harding, 2000a; 2001a; 2001c). NASA has prepared Closure Plans for smaller areas within each of the parcels
of the NRP (Table 2). The Closure Plans include requirements for removing and closing known underground storage tanks (USTs). The identified USTs will be removed and closed by NASA, the developer, or the current tank operator pursuant to the Closure
Plans and applicable regulations. 

  
 6-13 

 In the event an unknown UST or sump is discovered during site construction activity, the NASA environmental
representative will be contacted immediately. The UST or sump will be removed by the developer in accordance with Santa Clara County regulations and guidance, including: 
  

	 	•	 	Guidelines for Permanent Closure of Underground Hazardous Materials Storage Tank Systems and Sumps (17 May 2000 or later revision) 

Soil and groundwater samples will be collected by NASA from the UST or sump excavation and analyzed as required by the regulatory guidance and under the
supervision of Santa Clara County inspectors. 
 In the event buried drums or containers that contain unknown materials are discovered during site
construction activity, the NASA environmental representative will be contacted immediately and the procedures shown on Figure 13 will be followed. The term “containers” in this EIMP is intended to include containers that may contain or may
have contained hazardous substances. In the absence of labels or other knowledge of the container’s contents, the developer in consultation with NASA will use professional judgment, including evaluating any observed odors or soil staining, to
assess whether the procedures summarized in Figure 13 should be triggered. 
 As indicated in Figure 13, drums and containers will be removed from the
excavation by the developer, contents will be characterized by NASA, and the drums and their contents will be disposed in accordance with applicable laws and regulations by NASA at the Navy’s expense. A representative soil sample will be
collected by NASA under the drum or container. Determination of the specific laboratory analyses to be performed will be . based on field observation and professional judgment of a licensed or certified hazardous material manager or registered
environmental professional and on characterization of the contents of the drum or container. If COPC concentrations exceed soil TCLs, the soil management protocols described in Section 6.10 will be followed. 

The implementation of the protocol for managing buried drums or containers shall be documented through the use of field notes and photographs. After
completion of the removal of the drums or containers and any subsequent management of potentially impacted soil (conducted in accordance with the procedures described in Section 6.10), NASA, with the assistance of the developer, will prepare a
report that describes the field activities, findings, actions taken, and analytical results for activities conducted by the project developer. The Report will also include a figure depicting the location where the action was taken, chain-of-custody
forms, and photographs. Reports will be submitted to the Navy, U.S. EPA, RWQCB and other involved regulatory agencies as documentation of the completion of the action. 

Documentation of actions relating to removal of abandoned USTs or sumps will be in accordance with Santa Clara County’s regulation and guidance for
closure of USTs and sumps. 

  
 6-14 

	6.8.	Management of Abandoned Pipes 

 If an abandoned pipe is encountered during construction, the procedures
presented in decision diagram shown on Figure 14 will be followed. The objectives of this protocol for abandoned pipe management are (a) to remove potential sources of contamination, including impacted soil and (b) to prevent pipes from acting as a
future conduit for contaminant migration. 
 Upon encountering an abandoned pipe, the NASA environmental representative will be notified. If the pipe is
associated with a tank, then the pipe will be removed with the tank in accordance with Santa Clara County requirements for UST removal as described in Section 6.7. Otherwise, the pipe will be managed as outlined below and summarized in the decision
diagram shown on Figure 14. NASA may consult with U.S. EPA prior to removing the abandoned pipe. 
 If the pipe contains liquid or sludge, the following
actions will be taken: 
  

	 	•	 	the liquid or sludge will be removed from the pipe, if feasible, and placed in an appropriate container prior to removal of the pipe; 

 

	 	•	 	the liquid or sludge will be tested for hazardous constituents; 

  

	 	•	 	the pipe and the liquid or sludge will be disposed at an appropriate off-Site facility; and 

  

	 	•	 	stained, discolored or odorous soil will be sampled in accordance with the procedures described in Section 6.10.5. 

If not all of the pipe is removed for construction, the ends of the pipe that remain in place will be capped. 

The implementation of the protocol for abandoned pipes shall be documented through the use of field notes and photographs. After completion of the removal of
abandoned pipes and any subsequent actions managing potentially impacted soil in accordance with the soil management protocols in Section 6.10.5, the project developer will prepare a report that describes the field activities, findings, actions
taken, and analytical results for activities conducted by the project developer. The Report will also include a figure depicting the location where the action was taken, chain-of-custody forms, and photographs. Reports will be submitted to NASA, the
Navy, U.S. EPA, RWQCB and other involved regulatory agencies as documentation of the completion of the action. 
 The procedures presented in Figure 14 do
not apply to active or abandoned utilities, such as sanitary sewer, water, gas, or steam lines because they are not anticipated to have contained potentially hazardous materials. An exception, however, is the case of steam lines that are insulated
with asbestos-containing materials, in which case the provisions of Section 6.4 apply. 
  

	6.9.	Protection and Removal/Relocation of Monitoring Wells and Remediation System Components 

 As described in
Section 2.4, both the Navy and the MEW Companies currently operate groundwater remediation systems within the NRP. Measures must be taken to protect the 

  
 6-15 

 
integrity of the remediation systems during development of the NRP as outlined in the agreements with NASA and the Navy and MEW Companies included in Appendices D and E. A flow chart describing
the process for protecting the existing remediation systems and coordinating construction activities with the Navy’s and MEW Companies’ contractors is shown on Figure 15. 

 

	 	6.9.1.	Removal or Relocation of Remediation System Components 

 Potential conflicts between the developer’s
planned project and the location of existing remediation system components should be identified and resolved during the design stage as described in Section 5.4.2. The Navy’s or MEW Companies’ contractors will complete (at the project
developer’s expense) the design and implementation of any changes to the remediation system, such as properly sealing groundwater wells designated to be closed, installing and developing any replacement groundwater wells, and installing and
connecting any rerouted pipelines or other system components that need to be relocated. The project developer should work with the Navy’s and MEW Companies’ contractors to coordinate the schedule for completion of EPA-approved remediation
system with the developer’s construction schedule. 
 Following completion of final grade by the developer’s contractor, the Navy and MEW
Companies’ contractors will make final changes (at the developer’s expense) to Navy and MEW wells, well vaults, and pull boxes as needed based on the final grade established by the developer’s contractor. 

 

	 	6.9.2.	Protection of Groundwater Wells and Remediation System Components  

 Prior to the start of construction,
contractors for the Navy and MEW Companies will show the developers the locations of all of the groundwater extraction and monitoring wells in the field. Before initiating building demolition or other construction work, the project developer’s
contractors shall install brightly painted steel pipes or bollards around each groundwater monitoring or extraction well. The painted pipe shall extend above ground not less than four feet, so as to be highly visible, and shall be buried
sufficiently below the ground surface to protect the wellhead. Alternative equivalent well protection measures may be used by the project developer provided the alternative is approved in writing by the MEW Companies’ or the Navy’s
contractor. The developer’s contractor shall provide and place steel plate or equivalent protective measures over the existing MEW Companies’ and Navy’s pipelines and power and control conduits. 

Additionally, all site construction work within two feet of all groundwater wells shall be performed manually with hand tools. Fine grading work performed in
areas more than two feet from the wells but within close proximity shall be performed by light grading equipment. 
  

	 	6.9.3.	Shutdown of Remediation Systems  

 The groundwater remediation systems are required to be operated on a
continuous basis; any planned shutdown of the system for more than 24 hours in duration must be approved by EPA. In the event that planned construction activities would require a planned shutdown of any portion of the remediation system, the project
developer shall provide the Navy or MEW Companies with written notice at least five working days in advance of the proposed shutdown; the Navy or 

  
 6-16 

 
MEW Companies will coordinate obtaining EPA approval. In the event the developer’s activities results in an unplanned shutdown of any components of the remediation system, immediate verbal
notification must be given to the Navy or MEW Companies. In addition, a written explanation of the reason for and the duration of the shutdown must be provided to the Navy or MEW Companies within 48 hours of the shutdown. 

 

	 	6.9.4.	Remediation System Access 

 The NRP development must be performed in such a way that all groundwater
wells, pull boxes and the groundwater treatment system and associated components are made accessible to the Navy’s and MEW Companies’ contractors and their equipment for sampling, operation, maintenance, removal and replacement of pumps,
and well sealing during and after site development. If access to a well or other remediation system component is restricted during construction, written notice must be given to the Navy or MEW Companies, as appropriate, five working days in advance
of creating the restriction, with an explanation of the reason for and the expected duration of the proposed restricted access. The Navy and MEW Companies will provide the project developer with the planned schedule for well sampling and other
remedial activities. 
  

	 	6.9.5.	Accidental Releases of Untreated Groundwater 

 Prior to the initiation of construction, the developer
shall prepare a contingency plan to outline actions that would be taken in the event that the developer’s contractors damage any remediation system component in a manner that causes the release of untreated groundwater. During planning meetings
with the MEW Companies and the Navy, emergency contacts and procedures to initiate emergency shutdown of system components, if necessary, shall be reviewed. The plan shall identify any emergency equipment the developer may need to retain onsite
during construction activities to control or contain potential releases of untreated groundwater. The plan shall be submitted to NASA, and the MEW Companies or the Navy (depending on which system is potentially affected) for review and approval
prior to the start of construction activities in areas where remediation system components are located. 
 In the event that construction activities result
in the release of untreated groundwater, the developer shall immediately notify NASA, and the MEW Companies or the Navy (depending on which remediation system is affected). The MEW Companies or Navy (as appropriate) will subsequently notify EPA of
the release and the status of remediation system operations. If the remediation system is shut down due to damage to the system or to control the release of untreated groundwater, the developer will provide a written explanation for the shutdown to
the Navy or MEW Companies as described in Section 6.9.3. 
 The developer will take immediate action to control the source of the spill and contain
untreated groundwater that has been released in accordance with its approved contingency plan. Effort shall be made to avoid release of untreated groundwater into storm sewers. 

After any continued release has been stopped or controlled, any areas where the release may have come in contact with or infiltrated subsurface soils shall be
identified. The MEW Companies or the Navy will coordinate with EPA regarding any further site assessment or other 

  
 6-17 

 
actions that should be taken to respond to the release of untreated water; however the developer would be responsible for the cost of responding to any release that was caused by their actions.
Potentially impacted soil will be screened using the soil management protocols for excavated soils described in Section 6.10. Soils found to contain COPCs above the TCLs will be excavated and treated on-site or disposed of offsite at a licensed
disposal facility at the developer’s expense. Any use of the Navy or MEW Companies respective soil treatment areas to address soil impacted by a release caused by the developer would require the specific agreement of the Navy or MEW Companies.
NASA will sign manifests as generator for any impacted soil that must be sent for offsite disposal. 
  

	6.10.	Soil Management Protocols 

 Soil will be excavated or relocated at construction sites within the NRP area
during demolition work, grading, foundation excavation, utility installation, and other construction-related activity. Whenever soil is being excavated or exposed, NASA or the contractor performing the work shall monitor the soil to determine if the
soil is contaminated with VOCs or petroleum hydrocarbons. In addition, additional soil management procedures are applicable when surface soil surrounding the perimeter of buildings within the NRP that may be potentially impacted by lead from
historical use of lead-based paints are planned to be excavated during development. Procedures for monitoring excavated soil for the presence of VOCs or petroleum hydrocarbons, and for managing soil that is found to be contaminated, are shown on the
decision diagrams on Figures 16 and 17 for soil that is excavated in the MEW or Navy allocation areas, respectively (see Section 2.4.3 and Appendix A). Procedures for managing soil potentially impacted by lead from historical use of lead-based
paints are shown on the decision diagram on Figure 18. The following sections describe: 
  

	 	•	 	requirements for managing potential lead-impacted soil surrounding buildings (Section 6.10.1); 

  

	 	•	 	procedures for screening soil excavated during construction activity for VOCs and petroleum hydrocarbons (Section 6.10.2); 

  

	 	•	 	procedures for testing and managing soil that potentially contains VOCs or petroleum hydrocarbons at concentrations above levels of concern (Section 6.10.3); 

 

	 	•	 	reusing soil on-site (Section 6.10.4); and, 

  

	 	•	 	contingency actions for the observation, investigation, and removal of additional impacted soil (Section 6.10.5). 

  

	 	6.10.1.	Lead-Impacted Soil 

 As discussed in Section 2.4.6, lead has been found to occur in surface soil near
existing buildings where lead-based paint was used historically (CWMI, 1993; Mactec, 2003a). At several buildings, lead was detected in surface soil at concentrations above the RWQCB RBSL for residential land-use (200 mg/kg), the U.S. EPA Region IX
PRGs for residential land-use (400 mg/kg), and in some cases lead was detected above the industrial/commercial PRG (1,000 mg/kg). 

  
 6-18 

 
In addition, at several buildings lead has been detected at concentrations that would classify excavated soil as hazardous waste or would otherwise restrict disposal of excavated soil. NASA has
indicated that lead-impacted soils that exceed the RWQCB ESL of 200 mg/kg shall be remediated prior to or during site development activities. As described in Section 2.4.6, the criteria for classifying excavated soil for disposal purposes in
California can be summarized as follows: 
  

	 	•	 	If the total lead concentration of excavated soil is greater than 1,000 mg/kg, it is classified as hazardous waste for disposal purposes; 

 

	 	•	 	If the soluble lead concentration (using the WET test) of excavated soil is greater than 5 mg/L, it is classified as hazardous waste for disposal purposes; and 

 

	 	•	 	If the total lead concentration of excavated soil is between 350 and 1,000 mg/kg, but the soluble lead concentration is less than 5 mg/L, the soil can only be disposed at a Class 1 hazardous waste landfill or a Class 2
landfill that has obtained approval from the RWQCB to accept waste in this category. 

 This section describes a general approach for
identifying lead-impacted soil that will require remediation. This approach is based on the assumption that excavation and off- site disposal is NASA’s preferred method for handling lead-impacted soil encountered during site redevelopment. The
general approach to managing potentially lead-impacted soils is shown schematically on Figure 18. For buildings that are to be demolished as part of redevelopment, lead-impacted soil shall be removed prior to building demolition. 

Under the approach outlined in this section, the lead concentration of soil remaining after excavation will be at or below the RWQCB ESL for lead in
residential soil. 
  

	 	6.10.1.1.	Lead-Based Paint Survey 

 Previous investigations conducted at NRP indicate that lead-impacted
soil surrounding buildings is likely due to the historical use of lead-based paints. The 1998 investigation conducted on behalf of U.S. EPA (Weston, 1998) concluded that elevated levels of lead in soil were not found near buildings that did not have
lead-based paints. Therefore, if the building has not already been surveyed for lead-containing material, the initial step is for NASA or the developer to conduct a survey to determine if lead-based paints are found in painted exterior surfaces. If
no evidence of the presence of lead-containing material is found and lead-impacted soil has not been identified during any previous soil sampling, no further action is required regarding lead. However, any soil excavated during construction
activities shall be screened for VOCs and petroleum hydrocarbons according to the procedures in Section 6.10.2. 
  

	 	6.10.1.2.	Initial Soil Lead Assessment 

 If a building survey has confirmed the presence of lead-based
paints, an initial assessment of lead in soil shall be conducted to determine if soils surrounding the building perimeter are impacted by elevated concentrations of lead. Surface soil sampling has been conducted for most of the buildings within the
NRP as described in Section 2.4.6. NASA has reviewed the results of 

  
 6-19 

 
previous sampling to determine if the data obtained were adequate to determine if lead-impacted soils requiring remediation are present and to identify additional areas requiring soil sampling
for lead analyses. NASA completed additional soil sampling for lead based on its review of the adequacy of existing data regarding lead in soil surrounding existing buildings in the NRP area (Mactec, 2003a). 

The initial soil assessment at buildings where lead-based paints are confirmed to be present involves collecting a suite of composite samples at the building
corners, near focused discharge points such as downspouts, and at regular intervals around the periphery of the building. By collecting multiple-increment composite samples rather than discrete soil samples, a better representative sample of bulk
soil conditions can be obtained. For sampling purposes, a soil sampling (and potential excavation) “cell” is assumed to be approximately 30-feet long by 5-feet wide by 6 inches deep. This geometry assumes that elevated levels of lead
generally do not extend farther than 5 feet from the building nor more than 6 inches deep into the soil column; however additional confirmation sampling will be conducted during excavation of lead-impacted soils to identify areas where lead-impacted
soils may extend further from building walls or at greater depth (see Section 6.10.1.3). All samples are collected from 0 to 6 inches below the surface at the drip-line (or no more than 2-feet from the building wall if no drip-line is apparent). A
sample is collected every 5 feet and the resulting six samples are thoroughly mixed and subsampled in accordance with ASTM Standard D-6051-96 (ASTM, 1996) to produce a representative 6-point composite for each 30-foot sample cell. Each composite
sample shall be analyzed for total lead. If a composite sample contains lead at a concentration greater than 50 mg/kg then that sample shall be tested for soluble lead using the Waste Extraction Test (“WET”) method. 

If any of the initial soil assessment sample results for lead exceed 200 mg/kg, then significant lead-related contamination is deemed to be present around the
building and excavation and disposal of lead-impacted soil shall be conducted prior to or as part of Site development. In addition, soil in areas where the total lead concentration is between 350 and 1,000 mg/kg, and the soluble lead concentration
is less than 5 mg/L will be designated for excavation and disposal at a Class 1 or Class 2 landfill with RWQCB approval to accept soil containing lead in concentrations between 350 and 1,000 mg/kg. Using these criteria, soil in areas where lead has
been detected at concentrations exceeding the RWQCB ESL for residential soil (200 mg/kg) will be excavated and properly disposed of. Any soil containing total lead in excess of the TTLC of 1,000 mg/kg or soluble lead in excess of the STLC of 5.0
mg/L will be managed as a hazardous waste. 
 If none of the initial soil assessment results exceed the 200 mg/kg total lead concentration, no further
action is required regarding lead. However, soils that contain total lead less than 200 mg/kg and soluble lead in excess of the STLC of 5.0 mg/L shall be properly disposed in a Class I landfill if they are to be excavated and moved from their
current location. Soil excavated during construction will be screened for VOCs and petroleum hydrocarbons according to the procedures in Section 6.10.2. 

  
 6-20 

	 	6.10.1.3.	Excavation and Disposal of Lead-Impacted Soil 

 Prior to building demolition, an initial
excavation will be conducted to remove shallow (e.g., approximately 6 inches in depth) soil surrounding the building in areas identified for remediation to a set distance from the building (e.g., approximately 10 feet). A determination of whether
additional excavation is required will be made based on the results of confirmation sampling of the sidewall and floor of the excavation (see below). 

Treatment, if necessary, and disposal of lead-impacted soil excavated prior to or during Site development will be performed in accordance with applicable laws
and regulations at permitted off-site treatment facilities. Disposal characterization samples can be collected in situ from disposal cells established from previous sampling data or from bins or stockpiles in accordance with the needs of the
disposal/treatment facility. NASA will arrange for off-site disposal of lead-impacted soil at the Navy’s expense and will sign manifests as generator of the waste. 

Confirmation samples will be collected from the floor and the excavation sidewalls for each excavation cell. As with the initial soil assessment sampling, the
floor and sidewall samples shall be 6-point composite samples, properly homogenized and subsampled in accordance with ASTM Standard D-6051-96. Samples shall be analyzed for total lead and soluble (STLC) lead if the total lead concentration exceeds
50 mg/kg. These results will be used to confirm that lead-impacted soils have been successfully excavated. Additional excavation may be necessary if confirmation sample analytical results indicate additional lead-impacted soils remain. 

After lead-impacted soils have been excavated and removed, soil excavation for site development can continue using the soil screening procedures described in
Section 6.10.2. A report shall be prepared summarizing the results of the lead-based paint survey, pre-remediation soil sampling, confirmation sampling after excavation, and excavation and disposal of lead-impacted soils. The report shall include
figures identifying sampling locations, analytical data reports, and copies of manifests documenting proper treatment and/or disposal of lead-impacted soil. This report shall be submitted to NASA, the Navy, and U.S. EPA to document compliance with
the soil management protocol for lead- impacted soils (Section 6.10.1). 
  

	 	6.10.2.	Excavated Soil Screening Procedures 

 As described in Section 2.4, there are a number of areas within the
NRP area where it is likely that soil containing COPCs may be encountered during construction activities, including the NEX service station, Site 9 (Buildings 29 and 31), Site 14-South, and Site 15. In addition, due to the regional groundwater
contamination, residual levels of chemicals of concern may be encountered if excavation extends to or near the saturated zone in locations above the groundwater plume. Since groundwater contamination extends over almost the entire NRP area (Figure
9), and since unknown sources may be present, screening of excavated soil will be performed during all construction excavation or trenching. This section describes the soil screening procedures that will be implemented. 

NASA or the developer’s contractor will visually monitor soil that is excavated during construction activity. The soil shall be visually observed for
evidence of discoloration or staining. If soil is encountered that is visibly stained, discolored, shiny, or oily or has a noticeable solvent-like or hydrocarbon odor, contingency procedures described in Section 6.10.5 will be implemented. 

  
 6-21 

 Soil screening will be conducted if the location of the construction site is within the MEW or Navy allocation
areas (Areas AR-1 and AR-2, respectively, as shown on the Figure (labeled as Exhibit BI) in Appendix A, which is taken from the Allocation and Settlement Agreement (see Section 2.4.3)), and which generally include the area where the regional VOC
groundwater contamination is found. Within this area, groundwater is known to be impacted by COPCs and there is a greater likelihood of encountering COPCs in soil during construction. For soil excavation that occurs within these areas, the soil
screening procedures shown on Figure 16 (locations within the MEW allocation area AR- I) and Figure 17 (locations within the Navy allocation area AR-2) will be used. 

For soil excavation activities conducted within the MEW and Navy allocation areas, every 15 cubic yards of soil that is excavated will be screened for the
possible presence of chemicals of concern. The screening will apply to soil that is excavated for utility trenches, building foundations, or other construction purposes. The screening procedure does not apply to soil that is moved around the project
site during rough or final grading. 
 The excavated soil screening procedure is as follows: 

 

	 	•	 	A representative sample will be collected from a minimum of every 15 cubic yards of soil and screened with an organic vapor analyzer (“OVA”) using the headspace screening procedure described in Section
6.10.2.1. 

  

	 	•	 	If a continuous reading of 5 parts per million by volume (“ppmv”) or greater for 10 seconds or more is observed in the soil sample headspace using the OVA, the soil will be considered as “possibly
containing chemicals” and will be segregated. Such soil will be transferred to a stockpile at a location in the construction area designated by NASA. The developer will place a plastic liner underneath the soil and will cover the stockpile with
a plastic liner at all times except when material is being handled. The top covering will be adequately secured so that all surface areas are covered. Berms will be constructed by the developer around the stockpile area to control precipitation
run-on and run-off. All handling of contaminated soil must comply with BAAQMD Regulation 8, Rule 40. Soils from the saturated and unsaturated zone will be stockpiled separately. 

 

	 	•	 	Samples will be collected by NASA or the developer from the stockpile of soil considered to possibly contain chemicals (based on the OVA screening). Two composite samples will be collected from random locations from
within every 50 cubic yards of stockpiled soil. Soil samples shall consist of at least five composite samples representative of the stockpiled soil. The two samples will be submitted to a state-certified laboratory and analyzed for (a) VOCs, using
EPA Method 8260, including Freon 113, and (b) total purgeable petroleum hydrocarbons, gasoline range organics (TPHg) using EPA Method 8015m, (c) total extractable petroleum hydrocarbons, diesel range organics (TPHd) using EPA Method 8015m, and (d)
priority pollutant metals, using EPA Method 6010. The analytical results will be compared to soil TCLs (Tables 4 and 5). If chemical 

  
 6-22 

	 	•	 	concentrations in the soil samples do not exceed the soil TCLs, the soil can be reused at the site for backfill. NASA will be responsible for the determination of whether soil qualifies as clean soil. If chemical
concentrations in the soil samples exceed the soil TCLs, the Navy or MEW Companies will be notified, as described in Section 6.10.2.2 and the soil will be managed as described in Section 6.10.3. 

 

	 	•	 	Excavated soil not exceeding 5 ppmv in the headspace for 10 seconds or more during soil screening can be reused at the site for backfill or cover without any further soil sampling or analyses. 

 

	 	6.10.2.1.	Field Headspace Soil Screening Method 

 Soil samples will be screened in the field for the
presence of VOCs using the following screening method: 
  

	 	•	 	a soil sample from the excavated soil will be placed into an unused re-sealable plastic bag with a minimum volume of one quart, until the container is approximately one-half full; 

 

	 	•	 	the container will be sealed and soil will be crumbled by hand, if possible, to expose fresh surfaces; 

  

	 	•	 	after at least 2 minutes, the container will be opened just enough to allow the probe of the OVA to be inserted into the container’s headspace; 

 

	 	•	 	if an OVA reading of 5 ppmv or higher is observed continuously for 10 seconds or more, the sample will be considered to “possibly contain chemicals.” 

The OVA used in the above analysis will utilize either a flame-ionization detector (“FID”) or a photo-ionization detector (“PID”). The OVA
will be calibrated with a standard consisting of 100 ppmv of isobutylene in air. The OVA will be calibrated at 0 ppmv using ambient air. 
  

	 	6.10.2.2.	Notification of Soil Containing Chemicals and Impacted Soil 

 NASA, the Navy, and the MEW
Companies must be notified when the results of chemical screening indicates excavated soil contains or possibly contains chemicals of concern. Notification requirements will differ depending on whether the soil excavation. is located within the Navy
or MEW allocation areas (see Appendix A). 
 MEW Allocation Area 

Within the MEW allocation area, the following notification requirements will apply: 
  

	 	•	 	if the OVA screening criterion is exceeded and the project developer is conducting the soil screening, NASA and the MEW Companies will be notified immediately; 

 

	 	•	 	if laboratory analysis of saturated zone soil confirms the presence of VOCs, the MEW Companies will be notified immediately; 

  
 6-23 

	 	•	 	if analytical data are obtained that indicate excavated saturated soil containing VOCs would require treatment or disposal by the MEW Companies (as described in Section 6.10.3), the MEW Companies will be notified and
provided with copies of analytical reports for review; and 

  

	 	•	 	if analytical data are obtained that indicate excavated soil containing COPCs would require treatment or disposal by the Navy (as described in Section 6.10.3), the Navy will be notified and provided with copies of
analytical reports for review. 

 Navy Allocation Area 

Within the Navy allocation area, the following notification requirements will apply: 
  

	 	•	 	if the OVA screening criterion is exceeded and the project developer is conducting the soil screening, NASA will be notified immediately; 

 

	 	•	 	if analytical data are obtained that indicate excavated soil containing COPCs would require treatment or disposal by the Navy (as described in Section 6.10.3), the Navy will be notified and provided with copies of
analytical reports for review. 

 The notification provided shall include relevant information such as: 

 

	 	•	 	the approximate location from where the soil was excavated; 

  

	 	•	 	whether the soil was visibly stained, discolored, shiny, or oily or had a noticeable solvent-like or hydrocarbon odor; 

  

	 	•	 	OVA screening results; and, 

  

	 	•	 	the number of samples collected for laboratory analysis and any results already obtained. 

  

	 	6.10.2.3.	Documentation of Soil Screening & Management of Impacted Soils 

 The developer shall prepare a
report documenting implementation of the excavated soil screening procedures. The report shall include, as a minimum, the following information: 
  

	 	•	 	a summary of field headspace soil screening results, an estimate of the volume of excavated soil which exceeded the headspace soil screening criterion, and identification of the approximate location of excavated soil
which exceeded the headspace soil screening criterion; 

  

	 	•	 	a summary of laboratory analytical results of soil stockpile sampling and a compilation of laboratory analytical data reports; and 

  

	 	•	 	a summary of excavated soil transported to the Navy or MEW Companies soil treatment areas, including dates soil was transported to the soil treatment areas and the estimated volume of soil transported.

  
 6-24 

 The report shall be submitted to NASA and to the Navy and the MEW Companies (as appropriate). NASA shall also
submit the report separately to U.S. EPA and RWQCB to document implementation of the soil screening procedures of this EIMP, unless it is included as an appendix or attachment to reports submitted to U.S. EPA or RWQCB by the Navy or the MEW
Companies documenting the treatment or disposal of excavated soil. 
  

	 	6.10.3.	Management of Impacted Excavated Soils 

 Soil that is determined to contain COPCs at concentrations above
the soil TCLs (Tables 4 and 5) by the procedures described in Section 6.10.2 (“impacted soil”) will be managed as described below. Decisions regarding excavated soil management are determined in part based upon whether the soil is
excavated from the Navy or the MEW Companies’ allocation area at the Site, as described in Section 2.4.3 and shown in Appendix A, as well as whether the soil is from the saturated or unsaturated zone. These considerations are described further
below. 
 Impacted soil will be transferred by the project developer to the Navy’s bioremediation/aeration pad if: 

 

	 	•	 	the soil was excavated from the Navy’s allocation area; or 

  

	 	•	 	the soil was excavated from the unsaturated zone; or 

  

	 	•	 	the soil is determined to contain petroleum hydrocarbons based on the laboratory analyses described in Section 6.10.2. 

Prior to transferring impacted soil to the Navy’s bioremediation/aeration pad, the Navy will be notified and provided with copies of analytical data for
review as described in Section 6.10.1.1. 
 Treatment and disposal of soil transferred to the Navy’s bioremediation/aeration pad will be managed by
NASA at the Navy’s expense in accordance with applicable laws and regulations. Soil treated to the TCLs described in Section 4 may be reused on Site. 

Impacted soil will be transferred by the project developer to a soil aeration facility operated by the MEW Companies if: 

 

	 	•	 	the soil was excavated from the MEW Companies allocation area; and 

  

	 	•	 	the soil was excavated from the saturated zone; and 111 

  

	 	•	 	analytical results indicate the soil contains only VOCs associated with the MEW plume (i.e., chloroform, 1,2-dichlorobenzene, 1,1-DCA, 1,2-DCA, 1,1-DCE, cis-1,2-DCE, trans-1,2-DCE, Freon 113 (trichlorotrifluoroethane),
PCE, 1,1,1-TCA, TCE, and vinyl chloride), and does not contain petroleum hydrocarbons. 

 Treatment and disposal of soil transferred to the
MEW Companies’ soil aeration facility will be managed by the MEW Companies in accordance with applicable laws and regulations. Soil treated to the soil TCLs may be reused on Site if arrangements are made with the MEW Companies to transport the
treated soil back to the construction site, or for the developer to pick up the clean soil from the aeration area. 

  
 6-25 

 If for any reason impacted soil cannot be transferred to either the Navy’s or MEW Companies’ treatment
location as described above, the soil will be disposed off-Site at a permitted disposal facility in accordance with the soil characteristics and applicable laws and regulations at the MEW Companies’ or Navy’s expense. In this event, NASA
will sign manifests as generator of the waste. 
  

	 	6.10.4.	Soil Re-Use On-Site 

 Soil that meets the soil TCLs may be reused as backfill within the project area
from which it was excavated. Excess soil that meets the TCLs but cannot be reused within the project area based on its physical characteristics or the final site grading limits may be reused as fill elsewhere at the NRP subject to the approval of
NASA. 
  

	 	6.10.5.	Contingency Actions for the Observation, Investigation, and Removal of Unnaturally Stained, Discolored, or Odorous Soil 

As described in Section 2.4, there are several areas where soils containing COPCs are known to exist. In addition, previously unknown soil contamination may be
observed during earthwork activities or building demolition, such as when existing building slabs are removed, during grading work, or within excavations for trenches or building foundations. If, during any earthwork or building demolition
activities at the site, soil is encountered that is visibly stained, discolored, shiny, or oily or has a noticeable solvent- like or hydrocarbon odor, actions will be taken as outlined in the decision diagram on Figure 19 and as summarized below.

 In the event that previously unknown soil contamination is observed during construction activities at the Site, NASA shall be immediately notified. A
sample of the visibly contaminated or odorous soil will be collected for laboratory analysis and analyzed at a minimum, for Site COPCs by the following standard soil screening analyses: 

 

	 	•	 	VOCs by EPA Method 8260, included Freon 113; 

  

	 	•	 	TPHg by EPA Method 8015m; and 

  

	 	•	 	TPHd by EPA Method 8015m. 

 Additional analyses shall be performed if there is evidence that other chemicals
(e.g., non-volatile chemicals) may be present that could represent a potential health risk through direct contact by subsurface workers. Determination of whether other chemicals may be present would be based on field observation and professional
judgment of a licensed or certified environmental professional and take into consideration the location of the excavation in relation to known source areas that have been previously investigated. Additional analyses may include the following: 

 

	 	•	 	Title 22 metals by EPA Method 6010; 

  
 6-26 

	 	•	 	SVOCs by EPA Method 8270; 

  

	 	•	 	PCBs/Pesticides by EPA Method 8080; or 

  

	 	•	 	Herbicides by EPA Method 8151. 

 If it is determined that no additional analyses beyond the standard soil
screening parameters are required, soil excavation may proceed to the extent needed to continue construction activities. The excavated soil will be managed as described above in Sections 6.10.2, 6.10.3, and 6.10.4. If the results of the evaluation
sample indicate COPCs at concentrations above the soil TCLs, additional action may be necessary as described in Section 6.10.5.2.1 
  

	 	6.10.5.1.	Managing Soil Impacted by COPCs Other Than VOCs or TPH 

 If additional analyses are conducted, the
results can be compared to soil TCLs. Current applicable U.S. EPA Region IX PRGs, RWQCB ESLs, or local background levels for residential soils can be used as target concentration levels for those chemicals for which soil TCLs have not been developed
for the NRP area. If the analyses indicate concentrations of chemicals above soil TCLs, the Navy shall be notified and provided with copies of the analytical data. 

If after review of sampling results, it is determined that excavation activities can proceed safely, soil excavation can proceed to the extent needed for
construction. Soil potentially contaminated by COPCs other than VOCs or TPH shall be segregated and stockpiled separately from other excavated soil for off-site disposal. NASA will sign any waste manifests as the generator and will arrange for
off-site disposal of impacted soil at the Navy’s expense. When the construction excavation is complete, confirmation soil sampling shall be conducted as described in Section 6.10.5.2. The developer need only excavate to the extent required for
construction. Any remaining contamination will be referred to the Navy for evaluation with regulators. 
 In addition, if it appears that potentially
contaminated soil impacted by COPCs other than VOCs or TPH may have been completely removed prior to the completion of the construction excavation, confirmation sampling (as described in Section 6.10.5.2) may be conducted. If the concentrations of
COPCs other than VOCs or TPH are less than soil TCLs, the remaining construction excavation can be conducted using the procedures described in Sections 6.9.2, 6.9.3 and 6.9.4. 

 

	 	6.10.5.2.	Management of Impacted Soils After Construction Excavation is Complete 

 If the concentration of
COPCs in the evaluation sample exceeds soil TCLs, additional action is required after soil requiring excavation for construction purposes is removed. Confirmation soil samples shall be collected from the excavation sidewalls and floor (if the
excavation did not extend to the groundwater table or if soils were impacted by COPCs other than VOCs or TPH) in the area where visually stained or odorous soils were or are still present. Laboratory analysis of the confirmation soil samples shall
be conducted with the specific analyses to be performed selected on the basis of the initial evaluation sample results. If the results of the confirmation soil samples indicate that all COPC concentrations are below soil TCLs, no further action is
required. 

  
 6-27 

 Confirmation samples will be collected from in-place soils at the limits of the excavation as follows: 

 

	 	•	 	Sidewall samples will be collected from freshly exposed soil approximately one- half of the excavation depth at a minimum frequency of every 50 linear feet of sidewall excavation face. The discrete sidewall samples will
be collected from freshly exposed soil approximately one-half of the excavation depth. 

  

	 	•	 	Bottom confirmation samples will be collected from excavation bottoms at discrete locations on approximately 50-foot centers for areas greater than approximately 2,500 square feet if the excavation does not extend to
the groundwater table or if soils were impacted by COPCs other than VOCs or TPH. 

  

	 	•	 	A minimum of one bottom sample and one sample per excavation sidewall face will be collected from each excavation. 

If the results of the confirmation sample analyses indicate that COPCs are present in unsaturated zone soils at concentrations that exceed soil TCLs, the Navy
shall be notified. Soils remaining in place will be managed according to one of the three tracks summarized below and shown on Figure 19. The procedures allow for initial overexcavation, if desired, and then include collection and analysis of soil
samples to determine the type of chemical impact, if any, in the remaining soil. If chemical concentrations in the soil samples exceed soil TCLs, the developer will coordinate with NASA in evaluating which approach to managing the impacted soil will
be followed. Once an approach is selected, the Navy shall be notified and kept informed of progress during implementation. 
 One of three general
approaches, or “tracks,” described below will be followed; the choice of the track will depend on the apparent extent of contamination, the construction schedule, and physical constraints. The first two tracks are designed to be
implemented relatively quickly by the developer in coordination with NASA to completely address limited source areas in locations that potentially impact the construction project. For example, during excavation for a building foundation, the
developer may encounter a potential VOC-source area that extends underneath the footprint of the planned building. In this situation, it may be appropriate for the developer to excavate impacted soils within the building footprint so that
construction can proceed without delay. The third track is potentially appropriate for larger source areas for which excavation may not be practicable or if the source area extends into areas that do not affect the construction project schedule. In
this track, the developer and NASA defer any action to the Navy, which will be responsible for agency coordination and for implementation of any actions. 
  

	 	•	 	 Track 1 - Excavate and Remove, Collect Confirmation Samples: Track 1 is considered a “Fast
Track” remedial approach, and is designed to allow development work to proceed with minimal delay. Unsaturated zone soils that appear to contain chemicals above TCLs are excavated, screened, stockpiled, and managed as described in the previous
sections. Confirmation soil samples are then collected from remaining soil in the excavation sidewalls and floor (if the 

  
 6-28 

	 	excavation did not extend to the groundwater table) to verify that impacted soils have been removed. Confirmation samples shall be collected at the same frequency as described earlier in this Section 6.10.5.2. Excavation
is considered complete if confirmation soil sample results are below TCLs or until the top of the groundwater table is encountered. After soil excavation is considered complete, the excavation may be backfilled with clean soil and development
work may continue. 

  

	 	•	 	Track 2 - Characterize In-Situ: Track 2 is considered the “Middle Track” remedial approach because in situation characterization requires significantly more time than the direct excavation
approach. Track 2 may be more appropriate (a) if the construction schedule allows for in situ characterization, or (b) if the potentially impacted area is suspected to be large. Under Track 2, the extent of impacted soils is characterized
in situ by installing soil borings in advance of the soil removal action (i.e., extent characterized in advance with borings, rather than confirmation sampling). Based on the nature and extent of contamination, the developer in
coordination with NASA can decide whether to proceed with the removal and disposal of impacted soils, or to defer any action to the Navy for coordination with the regulatory agencies if excavation does not appear to be practicable at that time.

  

	 	•	 	Track 3 — Standard Agency Oversight: Track 3, involving direct regulatory agency involvement in decision making, may be more appropriate (a) if excavation is not practicable at that time (e.g., the
potentially impacted area is particularly large in size or there are physical constraints like a building), (b) if the construction schedule is not impacted by the impacted area, or (c) if no further action is believed to be necessary due to the
nature of the source or because operation of the regional groundwater remediation system adequately addresses any potential impact due to the identified impacted soil. Any further site assessment will be conducted by the Navy in coordination
with the regulatory agencies. 

  

	 	6.10.5.3.	Documentation of Contingency Actions Taken 

 The implementation of contingency actions shall be
documented through the use of field notes and photographs. After completion of a contingency action, the project developer will prepare a report that describes the field activities, findings, actions taken, and analytical results for activities
conducted by the developer or its contractors. The report will also include a figure depicting the location where the action was taken, chain-of-custody forms, and photographs. Reports will be submitted to NASA, the Navy, U.S. EPA, RWQCB
and other involved regulatory agencies as documentation of the completion of contingency actions. 

  
 6-32 

 7. POST-CONSTRUCTION AND LONG-TERM RISK 

MANAGEMENT 
 This section of the EIMP
addresses precautions that shall be implemented to mitigate long-term risks to human health and the environment related to exposure to COPCs during periods of normal non-construction activity. Any construction that will disturb the soil,
building foundations, or pavement shall be completed in a manner that is consistent with the EIMP, particularly Sections 5 and 6, and all then-applicable environmental policies, laws, and regulations. 

Components of the EIMP for long-term risk management activities are as follows: 
  

	 	•	 	Providing required notification to future property managers and tenants of the known environmental conditions at the Site (applicable Environmental Baseline Surveys and closure plans), the Revised HHRA, lead and
asbestos surveys, results of available air monitoring data, and the requirements of the EIMP (Section 7.1); 

  

	 	•	 	Ensuring that future land uses are consistent with the planned land-use assumed in this EIMP in terms of exposure risk assumptions (Section 7.2); 

 

	 	•	 	Prohibiting the use of untreated groundwater at the Site (Section 7.3); 

  

	 	•	 	Establishing a notification procedure and protocols for future subsurface activity to ensure long-term compliance with this EIMP (Section 7.4); 

 

	 	•	 	Periodically reviewing and modifying this EIMP, as necessary, to address any new COPCs encountered in the NRP, any newly-developed toxicological data relating to COPCs, and any significant changes in exposure
assumptions because of an intended land use that is different from the planned land use upon which this EIMP is based (Section 7.5); 

  

	 	•	 	Evaluating annual groundwater monitoring data collected by the Navy and the MEW Companies to determine if there is any need to modify this EIMP (Section 7.5.1); and 

 

	 	•	 	Inspecting the Site as necessary to verify that risk management controls are being implemented and that they are effective in limiting potential exposure to VOCs at the Site (Section 7.5.2). 

 

	7.1.	Property Manager and Tenant Notification 

 The developer and NASA shall both be responsible for providing
notification of the known environmental conditions at the Site and of the requirements of this EIMP to the property manager, and tenants and other entities leasing or otherwise exercising control over space at the Site. The developer shall
provide written documentation of any required notification it makes to tenants or other parties to NASA’s development office, which will maintain overall records providing documentation that required notifications have been made to all
appropriate parties. 

  
 7-1 

	7.2.	Maintaining Planned Land Use 

 This EIMP was prepared based on the planned land use for the NRP outlined
in the NASA Ames Development Plan. Except for potential residential land use in NRP parcels 6, 12, and 12a shown on Figure 2, planned land use consists of a commercial/industrial/academic research center, conference center, and museum. If
any significant change in the land use is proposed in the future, additional risk analysis shall be conducted by NASA, the NASA Partners, and project developers to support any changes in this EIMP, and must be approved by NASA, the EPA, the RWQCB
and other appropriate environmental regulatory agencies. 
  

	7.3.	Prohibiting Use of Site Groundwater 

 Because chlorinated solvents are known to be present in groundwater
at concentrations that exceed U.S. and California maximum contaminant levels for drinking water, NASA, the NASA Partners, project developers, and tenants are responsible for ensuring that groundwater beneath the site will not be used for
drinking water or for any other purpose until such time that a risk assessment is performed that demonstrates the proposed use of groundwater does not represent a significant risk and the use of groundwater at the site is approved by NASA, the U.S.
EPA, the RWQCB, and the SCVWD. Notwithstanding the foregoing sentence, treated groundwater may be used for irrigation and/or industrial heating or cooling, or other processes, as approved by NASA. 

 

	7.4.	Protocols for Future Subsurface Activities 

 Site health and safety procedures, as described in Section
6.2, will be followed for all individuals engaged in activities that disturb subsurface Site soil (e.g., utility repairs, work on building foundations, changes to paved areas, and changes to landscaping and unpaved recreational areas). Such
work will follow the soil handling and other protocols discussed in Section 6 unless a future evaluation results in regulatory agency approval of alternate procedures. Utility clearances will be conducted prior to any subsurface drilling. 

Site landowners and tenants will require each contractor with workers that may contact Site groundwater or disturb Site soil to prepare its own site-specific
H&SP, as described in Section 6.2. The requirement for preparation of a site-specific H&SP also applies to activities involving work in utility vaults or other subgrade areas (e.g., utility maintenance or modifications in subfloor
areas of buildings) where potential exposure to accumulated VOC vapors may occur. Each H&SP will be consistent with State, Federal, and any other applicable health and safety standards and regulations. Among other things, a
contractor’s H&SP will include a description of health and safety training requirements for on-Site personnel, a description of the level of personal protective equipment to be used, air monitoring requirements, confined space entry
procedures, if applicable (e.g., work in utility vaults), and any other applicable precautions to be undertaken to minimize direct contact with soil and groundwater or exposure to COPC vapors. Site workers will have the appropriate level of
health and safety training and will use the appropriate level of personal protective equipment, as determined in the relevant H&SP. 

  
 7-2 

	7.5.	Long-Term Compliance; Periodic Review and Update of EIMP 

 Management measures will be implemented to
ensure long-term compliance with this EIMP. The NASA Partners and project developers shall maintain documentation of notification of the known environmental conditions at the Site and of the requirements of this EIMP to the property manager,
and tenants and other entities leasing or otherwise exercising control over space at the Site as described in Section 7. Property managers, tenants, or others exercising control over space at the Site will inform their construction contractors
and maintenance workers about the EIMP, as needed, to ensure compliance. 
 To the extent that subsurface work is conducted, documentation shall be
maintained to show that the protocols for the subsurface activities described in Section 7.4 were followed as required by the EIMP. 
 This EIMP, and any
addenda, will be periodically reviewed by NASA and its Partners as necessary to address new COPCs encountered in the NRP and not addressed in the existing EIMP, any newly available toxicological data relating to COPCs, or any significant changes in
land use from the planned land use on which this EIMP is based. NASA will update the EIMP, as needed, based on annual review of site conditions. 
  

	 	7.5.1.	Evaluation of Groundwater Monitoring Data 

 NASA and the developer will review on an annual basis
groundwater monitoring data compiled by the MEW Companies and the Navy to determine if there has been any significant change in the nature, extent, or concentration of COPCs in groundwater that would require potential modification of this EIMP. 

If the project developer identifies a groundwater well for proposed decommissioning, such a proposal shall be made to the MEW companies directly if it is a
MEW well or to NASA if it is a Navy well. 
  

	 	7.5.2.	Inspections/Maintenance/Monitoring 

 As described in section 5.1.4, it is the responsibility of the
project developer to periodically monitor and verify the adequacy of vapor intrusion mitigation measures that may be necessary depending on the specific measures implemented. In addition, regular inspections of system components, such as
blowers in sub-floor ventilation systems, shall be conducted to ensure their proper operation. 
 In the event that work on utility lines or subfloor areas
occurs in buildings that have implemented vapor mitigation measures as described in Section 5.1, cracks in the concrete floor and around utility penetrations shall be sealed. In addition, if a vapor intrusion barrier (Section 5.1.3.6)
has been installed, work shall be completed in a manner that does not tear, penetrate, or otherwise compromise the vapor intrusion barrier. If penetration of the vapor barrier is unavoidable or occurs inadvertently, measures shall be taken to
reseal the vapor barrier. 
 In accordance with guidelines to be provided by NASA in the future, an annual report shall be prepared by
NASA’s Partners summarizing and evaluating the results of the 

  
 7-3 

 
inspection/maintenance/monitoring activities and documenting the continued adequacy of the implemented risk management measures. This report shall include documentation that appropriate
notifications have been made, discussed in Section 7.1, and that appropriate protocols for subsurface activities have been implemented, as discussed in Section 7.4. This annual report shall be submitted to NASA for review. 

NASA may elect to compile: 
  

	 	•	 	information from the annual reports reviewed from the project developers; 

  

	 	•	 	information regarding any intended changes in land use; and 

  

	 	•	 	future available information regarding the potential health effects of COPCs; 

 and will update the EIMP, on a
schedule as deemed appropriate by NASA. 

  
 7-4 

 8. REFERENCES 

ASTM, 1995. Standard Guide for Risk-Based Corrective Action Applied to Petroleum Release Sites, Designation E-1739-95, American Society for
Testing and Materials, November 1995. 
 ASTM, 1996. Standard Guide for Composite Sampling and Field Subsampling for Environmental Waste Management
Activities, Designation D-6051-96, American Society for Testing and Materials, December 1996. 
 Benchmark, 2001. Survey of Indoor Lead and
Asbestos for the NASA Research Park, Benchmark Inc., September 2001 
 Benchmark, 2003. Polychlorinated Biphenyl, Lead, and Asbestos Sampling
Report. Hangar 1/Moffett Field, Mountain View, California, Benchmark Environmental Engineering, 9 January 2003. 

Cal/EPA, 1998. Letter from Derek Whitworth to Trudy Papler, NASA Ames Research Center, regarding soil cleanup levels for polychlorinated biphenyls,
10 February 1998. 
 CBC, 2001. 2001 California Building Code, California Code of Regulations Title 24, Part 2, Volume 1. California
Building Standards Commission. Based on the 1997 Uniform Building Code. Effective 1 November 2001. 
 CWMI, 1993. Surface Soil Lead
Survey, Naval Air Station Moffett Field, California, Chemical Waste Management, Inc., October 29, 1993. 
 DCE, 2002. NASA Ames Development
Plan, Final Programmatic Environmental Impact Statement, NASA Ames Research Center, Design, Community, and Environment, July 2002. 
 DMJMH+N,
2001. NASA Research Park Design Guide. Prepared by DMJMH+N and EDAW. November 2001 
 EKI, 2004. Draft Final Preliminary
Regulatory and Cost Evaluation of Alternative Approaches to Vapor Intrusion Mitigation at NASA Research Park, Erler & Kalinowski, Inc., 30 July 2004. 

Foster Wheeler, 2001. Draft First Annual Groundwater Report for EATS and WATS, Moffett Federal Airfield, Moffett Field, California,
Volumes 1-3, Revision 0, Foster Wheeler, 29 June 2001. 
 Foster Wheeler, 2003. Final Time-Critical Removal Action Work Plan
for Hangar 1, Former Naval Air Station Moffett Field, Moffett Field, California, Revision 0, Foster Wheeler Environmental Corporation, 9 September 2003. 

Harding, 1995. Summary of Site 9 Potential Sources, Moffett Federal Airfield, MEW Study Area, Mountain View, California, Harding Lawson
Associates, 2 March 1995 
 Harding, 2000a. Environmental Baseline Survey, NASA Research Park Parcel 1, Moffett Federal Airfield,
Moffett Field, California, Harding Lawson Associates, 18 October 2000. 

  
 8-1 

 Harding, 2000b. Indoor Air Quality Investigation, Buildings 476 and 543, Ames Research Center,
Harding ESE, Inc., 1 December 2000. 
 Harding, 2001a. Environmental Baseline Survey, NASA Research Park Parcel 5, Moffett Federal Airfield,
Moffett Field, California, Harding ESE, Inc., 5 March 2001. 
 Harding, 2001b. Soil Sample Results for Closure Plan 2, Building 555, NASA
Ames Research Center, Harding ESE, Inc., 11 April 2001. 
 Harding, 2001c. Environmental Baseline Survey, NASA Research Park Parcels 2, 3,
4, 6, and 7, Moffett Federal Airfield, Moffett Field, California, Harding ESE, Inc., 3 October 2001. 
 Harding, 2001d. Lead-Based Paint in
Soil, NASA Research Park Moffett Field, California, Harding ESE, Inc., December 2001. 
 Harding, 2001e. Indoor Air Quality Investigation,
Buildings 2, 15, 555, and 583c, Harding ESE, Inc., December 2001. 
 Harding, 2002a. Lead Impacted Soil Summary Report and Sampling and Removal
Workplan, NASA Research Park, Moffett Field, California, Harding ESE, Inc., 24 July 2002. 
 Harding, 2002b, Ambient Air Sampling and Analysis
Report, Moffett Field Hangar 1, Moffett Field, California, Harding ESE, Inc., 20 December 2002. 
 ICF-Clement, 1988. Endangerment
Assessment for the Middlefield-Ellis-Whisman Site in Mountain View, California, 2 September 1988. 
 IT Corp., l993a. West Side
Groundwater Site Characterization Report, NAS Moffett Field, California, March 1993. 
 IT Corp., 1993b. Remedial Investigation Report, Operable
Unit 2: Sites 3-11, 13, 14, 16-19 Soils, NAS Moffett Field, California, May 1993. 
 Locus, 1998. Letter from Marla Guttman and
Samuel Larano to Eugenia Chow, EPA Region IX regarding soil screening during pipeline construction for Regional Ground Water Remediation Program, 20 October 1998. 

Locus, 1999. Remedial Action Report, Regional Ground Water Remediation Program, Middlefield-Ellis-Whisman Site, Mountain View, California,
December 1999. 
 Locus, 2001. 2000 Annual Progress Report, Regional Ground Water Remediation Program, Consent Decree Work,
Middlefield-Ellis-Whisman Site, Mountain View, California, 15 February 2001. 
 Locus, 2003. Results of Air Sampling, Former Foairchild
Semiconductor Corporation Facilities Middlefield-Ellis-Whisman Site, Mountain View, California, prepared for Fairchild Semiconductor Corporation and Schlumberger Technology Corporation by Locus Technologies, Inc., August 2003 

  
 8-2 

 MADEP, 1995. Guidance for the Design, Installation, and Operation of Sub-Slab Depressurization
Systems, Thomas DiPersio and John Fitzgerald, Massachusetts Department of Environmental Protection, Northeast Regional Office, December 1995. 
 Mactec,
2003a, Lead Impacted Soil Sampling and Removal Action Implementation, Initial Soil Sample Results, NASA Research Park, Moffett Field, California, Mactec Engineering and Consulting, Inc., 28 January 2003. 

Mactec, 2003b. Revised Human Health Risk Assessment, NASA Research Park Moffett Field, California, Mactec Engineering and Consulting, Inc.,
28 July 2003. 
 NASA/Navy, 1992. Memorandum of Understanding Between Department of the Navy and National Aeronautics and Space Administration
Regarding Moffett Field, California, 22 December 1992. 
 NASA, 2000. Draft NASA Ames Development Plan, October 2000. 

NASA, 2001a. Agreement for Coordination of Construction and MEW Remedial System Modification Work NASA Research Park, Moffett Federal Airfield, In
Preparation. 
 NASA, 2001b. Coordination of Construction and Navy Remedial System Modification Work NASA Research Park Moffett Federal Airfield, In
Preparation. 
 PAJ/ISSI Team, 2000. Closure Plan Number 1, Buildings 111, 146, 161, 574, 958, and 992, NASA Ames Research Center,
Moffett Field, California, November 2000. 
 PAI/ISSI Team, 2001a. Closure Plan Number 2 Including Buildings 50, 148, 149,1 50, 151, 533, 555,
583A, 583B, 533, 590, 964, and 965, NASA Ames Research Center, Moffett Field, California, January 2001. 
 PAI/ISSI Team, 2001b. Surface Soil
Sample Results for Closure Plan 1 for Buildings 111, 146, 958, and 952, NASA Ames Research Center, Moffett Field, California, February 2001. 
 PAI/ISSI
Team, 2001c. Closure Plan Number 3 Including Buildings 82, 459, 512A, 512B, 512C, 534547B, 547C, 547D, 547E, 572,583C, 945, 966 and 967, NASA Ames Research Center, Moffett Field, California, March 2001. 

PAI/ISSI Team, 2001d. Closure Plan Number 4 Including Buildings 184, 343, 544, 585, 950, and 951, NASA Ames Research Center, Moffett Field,
California, May 2001. 
 PAI/ISSI Team, 2001e. Closure Plan Number 5 Including Buildings 104, 107, 108, 109, 113, 476, 503, 525,
526, 529, 543, 554, S56, 596, and 944, NASA Ames Research Center, Moffett Field, California, July 2001. 
 PAYISSI Team, 2001 f. Closure Plan 4
Soil Investigation, NASA Ames Research Center, Moffett Field, California, July 2001. 

  
 8-3 

 PAI/ISSI Team, 2001g. Soil Sample Results for Closure Plan 2 for Building 555, NASA Ames Research Center,
Moffett Field, California, July 2001. 
 PAI/ISSI Team, 2001h. Closure Plan Number 6 Including Buildings 158, 329, 331, 381, 382,
400, 438, 464, 956, 956A, NASA Ames Research Center, Moffett Field, California, September 2001. 
 PAI/ISSI Team, 2001i. Surface Soil
Investigation, Closure Plan 5 Area, NASA Ames Research Center, 18 October 2001. 
 PAI/ISSI Team, 2001j. Closure Plan Number 7 Including
Buildings 3, 12, 13, 14, 29, 31, and 480, NASA Ames Research Center, Moffett Field, California, November 2001. 
 PAI/ISSI Team, 2002a. Closure
Plan Number 8 Including Buildings: 6, 76, 81, 115, 460, 482, 509, 510, 527, 542, 567, and 570, NASA Ames Research Center, Moffett Field, California, January 2002. 

PAI/ISSI Team, 2002b. Closure Plan Number 10 Including Buildings: 32, 33, 44, 77, 83, 118, 119, 454, and 463, NASA Ames Research
Center, Moffett Field, California, September 2002. 
 PAI/ISSI Team, 2003a. Closure Plan Number 9 Including Buildings: 45,
64, 85, 126, 941, and 942, NASA Ames Research Center, Moffett Field, California, March 2003. 
 PAI/ISSI Team, 2003b. Surface Soil
Investigation, Closure Plan 6 Area, NASA Ames Research Center, Moffett Field, California, March 2003. 
 PAI/ISSI Team, 2003c. Subsurface Soil
Investigation, Closure Plan 9 and Closure Plan 10 Areas, NASA Ames Research Center, Moffett Field, California, 16 July 2003. 
 Palo Alto,
2000. Palo Alto Municipal Code 16.09.110. 
 PRC, 1990. Naval Air Station Moffett Field, Naval Exchange Service Station Building 503,
Mountain View, California PRC Environmental Management, 6 February 1990. 
 PRC, 1991a. Site 9 Action Memorandum, Naval Air Station Moffett
Field, California, PRC Environmental Management, 3 July 1991. 
 PRC, 1991b. Tank and Sump Removal Summary Report, Naval Air Station
Moffett Field, California, PRC Environmental Management, 15 July 1991. 
 PRC, 1991c. Building 29 Area Field Investigation Technical
Memorandum, Naval Air Station Moffett Field, California, PRC Environmental Management, 23 August 1991. 
 PRC, 1991d. Draft Site 9 Field
Investigation Technical Memorandum, Naval Air Station Moffett Field, California, PRC Environmental Management, 15 October 1991. 
 PRC,
1993. Additional Tank and Sump Field Investigation Technical Memorandum, Naval Air Station Moffett Field, California, PRC Environmental Management, 22 March 1993. 

  
 8-4 

 PRC, 1994a. Revised Final Installation Restoration Program, Petroleum Sites (and Wastewater Tanks and
Sumps) Characterization Report, Naval Air Station Moffett Field, California, PRC Environmental Management, 28 January 1994. 
 PRC,
1994b. Technical Memorandum, Petroleum Sites Petroleum Cleanup Level Analysis, Naval Air Station Moffett Field, California, PRC Environmental Management, 4 March 1994. 

PRC, 1994c. Final Additional Investigation of Inferred Sources Technical Memorandum, Naval Air Station Moffett Field, California, PRC
Environmental Management and Montgomery Watson, 18 April 1994. 
 PRC, 1994d. Operable Unit 2 — West, Final Design Report, Naval Air
Station Moffett Field, California, PRC Environmental Management, 11 May 1994. 
 PRC, 1994e. Naval Exchange Gasoline Station Investigation,
Draft Technical Memorandum, Moffett Federal Airfield, California, PRC Environmental Management, 24 August 1994. 
 PRC, 1994f. Final
Installation Restoration Program, Petroleum Sites (and Wastewater Tanks and Sumps) Corrective Action Plan, Moffett Federal Airfield, California, PRC Environmental Management, 18 November 1994. 

PRC, 1995a. Final Additional Petroleum Sites Investigation Technical Memorandum„ Moffett Federal Airfield, California, PRC Environmental
Management, 20 January 1995. 
 PRC, 1995b. Final Horizontal Conduit Study Technical Memorandum, Moffett Federal Airfield, California, PRC
Environmental Management, 4 August 1995. 
 PRC, 1995c. Final Operable Unit 2 - West (Building 88) Project Summary Report, Moffett Federal
Airfield, California, PRC Environmental Management, 9 October 1995. 
 PRC, 1996. Final Station-Wide Remedial Investigation Report, Moffett
Federal Airfield, California, PRC Environmental Management, 21 May 1996. 
 PRC, 1997. West Side Aquifers Treatment System
Definitive Design Report, Moffett Federal Airfield, California, PRC Environmental Management, 23 April 1997. 
 RWQCB, 1998. Information on
Erosion and Sediment Controls for Construction Projects: A Guidebook, Regional Water Quality Control Board, San Francisco Bay Region 1998. 

RWQCB, 1999. Erosion and Sediment Control Field Manual. Third Edition. Regional Water Quality Control Board, San Francisco
Bay Region, July 1999. 
 RWQCB, 2003. Screening For Environmental Concerns At Sites With Contaminated Soil and Groundwater, Interim Final,
California Regional Water Quality Control Board, San Francisco Bay Region, July 2003. 
 SAIC, 1999. Indoor Air Testing Program Report for Building
566, NASA Ames Research Center, Science Applications International Corporation, September 1999. 

  
 8-5 

 SAIC, 2000. Indoor Air Testing Report for Hangar 1 and Buildings 6, 21, 22, 26, 111, 148, 156, and 269,
NASA Ames Research Center, Science Applications International Corporation, January 2000. 
 Steen, 2003. Personal communication with John Steen,
NASA ARC, 10 November 2003. 
 Sunnyvale, 2000. City of Sunnyvale Sewer Use Regulations 12.12.120. 

Tetra Tech, 1998a. West-Side Aquifers Treatment System, Final Long-Term Groundwater Monitoring Plan, Moffett Federal Airfield,
California, Tetra Tech EM, Inc., 20 January 1998. 
 Tetra Tech, 1998b. Final Basewide Petroleum Site Evaluation Methodology Technical
Memorandum, Moffett Federal Airfield, California, 2 October 1998. 
 Tetra Tech, 1999a. Remaining UST Sites Investigation Field Work Plan
Draft, Moffett Federal Airfield, California, 15 February 1999. 
 Tetra Tech, 1999b. May 1999 Final Quarterly Report, Moffett Federal
Airfield, California, 29 December 1999. 
 Tetra Tech, 2000a. Basewide Petroleum Site Evaluation Methodology Technical Memorandum, Draft,
Appendix K, Petroleum Site Evaluation, Moffett Federal Airfield, California, 2 August 2000. 
 Tetra Tech, 2000b. Basewide Petroleum Site
Evaluation Methodology Technical Memorandum, Draft, Appendix E, Site 19 Petroleum Evaluation, Moffett Federal Airfield, California, 11 December 2000. 

Tetra Tech, 2001a. Basewide Petroleum Site Evaluation Methodology Technical Memorandum, Draft Appendix D, Moffett Federal Airfield, California,
20 January 2001. 
 Tetra Tech, 2003a. Basewide Petroleum Site Evaluation Methodology Technical Memorandum, Draft Final, Appendix J, Site 24,
Petroleum Evaluation, Moffett Federal Airfield, California, 23 April 2003. 
 Tetra Tech, 2003b. Basewide Petroleum Site Evaluation
Methodology Technical Memorandum, Draft Final, Appendix G, Site 9 Petroleum Evaluation, Moffett Federal Airfield, California, 16 June 2003. 

Tetra Tech, 2003c. Basewide Petroleum Site Evaluation Methodology Technical Memorandum, Draft Appendix F, Moffett Federal Airfield, California,
19 September 2003. 
 U.S. EPA, 1989a. Record of Decision, Fairchild, Intel, and Raytheon Sites, Middlefield/Ellis/Whisman (MEW) Study Area,
Mountain View, California, May 1989. 
 U.S. EPA, 1989b. Risk Assessment Guidance for Superfund, Volume 1- Human Health Evaluation
Manual. United States Environmental Protection Agency, December 1989. 

  
 8-6 

 U.S. EPA, 1990. Federal Facility Agreement Under CERCLA Section 120 Between the U.S. Environmental
Protection Agency and U.S. Department of the Navy and The State of California Represented by the California Department of Health Services and the California Regional Water Quality Control Board, San Francisco Bay Region, August 1990. 

U.S. EPA, 1991. Radon-Resistant Construction Techniques for New Residential Construction, Technical Guidance, U.S. EPA, Office of Research and
Development, EPA/625/2-91/032, February 1991. 
 U.S. EPA, 1993. Radon Reduction Techniques for Existing Detached Houses, Technical Guidance, (Third
Edition) for Active Soil Depressurization Systems, U.S. EPA, Office of Research and Development, EPA/625/R-93/011, October 1993. 
 U.S. EPA,
1994a. Radon Mitigation Standards, U.S. EPA, Air and Radiation, EPA 402-R-93-078, October 1993 (Revised April 1994). 
 U.S. EPA,
1994b. Radon Prevention in the Design and Construction of Schools and Other Large Buildings, Third Printing with Addendum, U.S. EPA, Office of Research and Development, EPA/625/R-92/016, June 1994. 

U.S. EPA, 2002a. Preliminary Remediation Goals Table, U. S. EPA, Region IX, Available through EPA PRG web home page: 

http://www.epa.goviregion09/wasteisfuncl/org/, updated 1 October 2002. 

U.S. EPA, 2002b. Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils (Subsurface Vapor Intrusion
Guidance). U.S. Environmental Protection Agency, 67 FR 71170, 29 November 2002 [http://www.epa.gov/correctiveaction/eis/vapor.htm]. 
 U.S.
EPA, 2004. Personal communications with John Moody, U.S. EPA Region IX, regarding GTE Government Systems site, 100 Ferguson Drive, Mountain View, California, 5 April 2004. 

Weston, 1998. Lead Based Paint Investigation Report for NAS Moffett Field, Mountain View, California, October 1998 

  
 8-7 

 TABLE 1 

Environmental Documents Supporting the Development of NASA Research Park 

NASA Research Park 
 Moffett
Field, California 
  

	 	•	 	Harding Lawson Associates. Environmental Baseline Survey — NASA Research Park Parcel 1. Moffett Federal Airfield, Moffett Field, California 94035. October 18, 2000 

The Environmental Baseline Survey (EBS) focuses on identifying and documenting environmental site characterization and remediation activities
and the presence or likely presence of hazardous substances and/or hazardous waste on a portion of real property considered for lease. The property identified in the EBS for parcel 1 (38 acres) consists of the western portion of the Shenandoah
Plaza Historic District. The EBS complies with Comprehensive Response, Compensation and Liability Act requirements. 
 Includes tables
of all the buildings indicating the following information: lead based paint, asbestos, historic status, year constructed, PCBs, Hazardous Materials, Hazardous Waste, Ordnance, UST, AST, Oil Water Separator/Sump, Radiation, Radon, and
Installation Restoration Program (IRP) site status. 
  

	 	•	 	Harding ESE, Inc. Environmental Baseline Survey- NASA Research Parcel 5 Moffett Federal Airfield, Moffett Field, California, 94035. March 5, 2001 

The Environmental Baseline Survey (EBS) focuses on identifying and documenting environmental site characterization and remediation activities
and the presence or likely presence of hazardous substances and / or hazardous waste on a portion of real property considered for lease. The property identified in the EBS for parcel 5 (84 acres) primarily consists of the former Navy support
facilities for the Naval Air Station. The EBS complies with Comprehensive Response, Compensation and Liability Act requirements. 

Includes tables of all the buildings indicating the following information: lead based paint, asbestos, historic status, year constructed,
PCBs, Hazardous Materials, Hazardous Waste, Ordnance, UST, AST, Oil Water Separator/Sump, Radiation, Radon, and Installation Restoration Program (IRP) site status. 

 

	 	•	 	Harding ESE. Inc. Environmental Baseline Survey- NASA Research Park Parcels 2,3,4,6, &7. Moffett Federal Airfield, Moffett Field, California,
94035. October 3, 2001. 

 The Environmental Baseline Survey (EBS) focuses on
identifying and documenting environmental site characterization and remediation activities and the presence or likely presence of hazardous substances and / or hazardous waste on a portion of real property considered for lease. The property
identified in the EBS for parcels 2,3,4,6, &7 (91 acres) primarily consists of the eastern portion of Shenandoah Plaza Historic District, Hangar 1, and portions of the former Navy support facilities for the Naval Air Station. The EBS
complies with Comprehensive Response, Compensation and Liability Act requirements. 
 Includes tables of all the
buildings indicating the following information: lead based paint, asbestos, historic status, year constructed, PCBs, Hazardous Materials, Hazardous Waste, Ordnance, UST, AST, Oil Water Separator/Sump, Radiation, Radon, and Installation
Restoration Program (IRP) site status. 

  
 Page 1 of 3 

 TABLE 1 

Environmental Documents Supporting the Development of NASA Research Park 

NASA Research Park 
 Moffett
Field, California 
  

	 	•	 	Mactec, Inc. Revised Human Health Risk Assessment. July, 2003. 

The Revised Human Health Risk Assessment evaluates the potential human health effects, based on current and future uses,
from possible exposure to hazardous chemicals in groundwater and air at the 213 acre NASA Research Park, Moffett Field, California. 

 

	 	•	 	PAI/ISSI TEAM. Closure Plans 1,2,3,4.5,6,7, 8, 9, and 10 for various buildings at NASA Research Park Moffett Field California. 

The closure plans describe the requirements and procedures for the demolition of buildings and associated structures
within the 213-acre NASA Research Park. The closure plans include descriptions of the facilities and hazardous materials handling and storage, including the presence of subsurface structures such as tanks, piping, sumps, wells, etc. A
description of the procedures to protect and / or destroy groundwater monitoring wells and treatment equipment is also included. Where a release of hazardous materials to the surface soil is suspected, a sampling and analysis plan is
included. Then an interim Closure Report with sampling results is prepared. Closure Reports have been prepared for Closure Plans 1, 2, 4, 5, 6, 9, and 10. 

 

	 	•	 	Harding ESE, Inc. Lead Based Paint in Soil. NASA Research Park Moffett Field,
California. December 2001. 

This study presents the results of identification and evaluation of the lead based paint (LBP) in the soil at various
locations within the 213-acre NASA Research Park. The report contains maps graphically showing the distribution of LBP areas to be excavated prior to building demolition, based on the ESL of 200 mg/kg. 

 

	 	•	 	Mactec, Inc. Lead Impacted Soil Sampling and Removal Action Worlplan Implementation, Initial Soil Sample Results, NASA Research Park January 2003. 

This report describes soil sampling activities adjacent to Buildings 24, 943, 510, 29, 3, 533, 113, 512C, 547B, and 329
and presents the results of testing the soils for lead. 

 

	 	•	 	Benchmark Inc. Survey of Indoor Lead and Asbestos for the NASA Research Park September 2001. 

This report identifies and evaluates the presence or absence of lead and asbestos within various buildings in the NASA
Research Park. 

  

	 	•	 	Harding Lawson Associates Indoor Air Quality Investigations Buildings 472 and 543. December 1, 2000. 

This investigation consisted of an indoor and outdoor air quality testing program to measure the levels of Volatile
Organic Compounds in and around buildings 476 and 543 within the NASA Research Park. The purpose of the sampling and testing was to evaluate potential human health risks associated with use of the buildings as dormitory/ living quarters.

  
 Page 2 of 3 

 TABLE 1 

ENVIRONMENTAL DOCUMENTS SUPPORTING THE DEVELOPMENT
OF NASA RESEARCH PARK 
 NASA Research Park 

Moffett Field, California 

 

	 	•	 	Harding ESE, Inc. Indoor Air Quality Investigations Buildings 2, 15.555, and 583c. December 2001. 

This investigation consisted of an indoor and outdoor air quality testing program to measure the levels of Volatile
Organic Compounds in and around buildings 2, 15, 555, and 583C. The purpose of the sampling and testing was to evaluate potential human health risks associated with use of the buildings. 

 

	 	•	 	Science Applications International Corporation, NASA Ames Research Center, Indoor Air Testing Program Report for Building 566. December 1999. 

This investigation consisted of an indoor air quality testing program to measure the levels of Volatile Organic Compounds
in Building 566. The purpose of the sampling and testing was to evaluate potential human health risks associated with use of the buildings. 

 

	 	•	 	Science Applications International Corporation. NASA Ames Research Center, Indoor Air Testing Program Report for Hangar 1 and Buildings 6, 21, 22,
26, 111, 148, 156 and 269. January 2000. 

This investigation consisted of an indoor and outdoor air quality testing program to measure the levels of Volatile
Organic Compounds in and around Hangar 1 and buildings 6, 21, 22, 26, 111, 148, 156, and 269. The purpose of the sampling and testing was to evaluate potential human health risks associated with use of the buildings. 

 

	 	$	Mactec, Inc. Interim Report on Long-Term Indoor Air Quality Study for Buildings 15, 17 and 243. NASA Ames Research Center, Moffett Field, California,
20 February 2004. 

 

This investigation consisted of an indoor and outdoor air quality testing program to measure the levels of Volatile Organic
Compounds in and around buildings 15, 17 and 243. 

  
 Page 3 of 3 

 TABLE 2 

SUMMARY OF CLOSURE PLANS 

NASA Research Park 
 Moffett Field,
California 
  

					
	 Closure Plan
	 	 Description of

Area Covered (1)
	  	 Report Date

	Closure Plan No. 1: includes Bldgs. 111, 146, 161, 574, 958, and 992	 	 Lab Project and

University Reserve;
 Land Use Parcel
2
	  	November 2000
			
	Closure Plan No. 2: includes Bldgs. 50, 148, 149, 150, 151, 533, 555, 583A, 583B, 533, 590, 964, and 965	 	 Lab Project and

University Reserve;
 Land Use Parcel
1
	  	January 2001
			
	Closure Plan No. 3: includes Bldgs. 82, 459, 512A, 512B, 512C, 534, 547B, 547C, 547D, 547E, 572, 583C, 945, 966, and 967	 	 Lab Project; Land Use

Parcels 1, 2, & 5
	  	March 2001
			
	Closure Plan No. 4: includes Bldgs. 184, 343, 544, 585, 950, and 951	 	 Lab Project;

Land Use Parcel 2
	  	May 2001
			
	Closure Plan No. 5: includes Bldgs. 104, 107, 108, 109, 113, 476, 503, 525, 526, 529, 543, 554, 556, 596, and 944	 	 University Reserve;

Land Use Parcels 3, 5,
 and
6
	  	July 2001
			
	Closure Plan No. 6: Bldgs. 158, 329, 331, 381, 382, 400, 438, 464, 956, and 956A	 	 University Reserve/

Burrowing Owl Preserve
 Area; Land
Use Parcels 7,
 8 & 19
	  	September 2001
			
	Closure Plan No. 7: Bldgs. 3, 12, 13, 14, 29, 31, and 480	 	 Historic District

Infill/Training/Conference
 Center;
Land Use Parcels
 13 & 14
	  	November 2001
			
	Closure Plan No. 8: Bldgs. 6, 76, 81, 115, 460, 482, 509, 510, 527, 542, 567, and 570	 	 Historic District

Renovation/Training/
 Conference
Center; Land
 Use Parcels 15 & 17
	  	January 2002
			
	Closure Plan No. 9: Bldgs. 45, 64, 85, 126, 941, and 942	 	 Open Space West of

Hangar 1; Between Land
 Use Parcels
13-15 and 18
	  	March 2003
			
	Closure Plan No. 10: Bldgs. 32, 33, 44, 77, 83, 118, 119, 454, and 463	 	Partner Parking Parcels;
Land Use Parcels 10 & 11	  	September 2002

 Notes: 
  

	(1)	See land use parcels identified on Figure 2 for location of Closure Plan areas; see Section 8.0 for complete citations for closure plans. 

  
 Page 1 of 1 

 TABLE 3 

VOLATILE ORGANIC COMPOUNDS 

Detected in Groundwater 

NASA Research Park 
 Moffett
Field, California 
  

			
	 Chemical of Concern (1)
	  	Maximum
Concentration Detected (2)
(mg/L)
	 Benzene (3)
	  	3
	 Chloroethane
	  	0.001
	 Chloroform
	  	0.250
	 1,1-Dichloroethane
	  	0.099
	 1,1-Dichloroethene
	  	0.230
	 1,2-Dichloroethane
	  	0.053
	 cis-1,2-Dichloroethene
	  	19
	 trans-1,2-Dichloroethene
	  	0.110
	 1,4-Dioxane
	  	0.051
	 Ethylbenzene
	  	0.362
	 Freon 113 (Trichlorotrifluoroethane)
	  	0.170
	 Methylene chloride
	  	0.460
	 Tetrachloroethene (PCE)
	  	0.160
	 Toluene
	  	0.045
	 1,1,1-Trichloroethane
	  	0.033
	 Trichloroethene (TCE)
	  	9
	 Vinyl chloride
	  	0.636
	 Xylenes (total)
	  	0.095

 Notes: 
  

	(1)	Volatile organic compounds detected in regional groundwater monitoring programs conducted by MEW Companies and the Navy, excluding compounds detected in less than 1% of samples. 

	(2)	Maximum concentration detected in groundwater samples collected from February 1995 through May 2001, based on data reported in Appendix C of Mactec (2003). 

	(3)	Benzene concentration detected in February 2000 during groundwater sampling conducted by the Navy in the vicinity of Tanks 19 and 20 in the southeast corner of the NRP area. 

References: 
 Mactec, 2003. Revised Human
Health Risk Assessment, NASA Research Park, Moffett Field, California, Mactec Engineering and Consulting, Inc., 28 July 2003. 

  
 Page 1 of 1 

 TABLE 4 

SOIL TARGET CONCENTRATION LEVELS FOR POLYNUCLEAR
AROMATIC HYDROCARBONS (PAHS), 
 SEMI-VOLATILE
ORGANIC COMPOUNDS (SVOCS), 
 POLYCHLORINATED BIPHENYLS,
AND METALS 
 NASA Research Park 

Moffett Field, California 
  

									
	 Chemical of

Potential Concern (a)
	  	Residential Soil
(<3m bgs)
ESL
(b)
(mg/kg)	  	Residential
Soil
PRG
(c)
(mg/kg)	 	Maximum
Background
Metal
Concentration
(d)
(mg/kg)	  	Soil Target
Concentration
Level
(“TCL”)
(e)
(mg/kg)
	 Polynuclear Aromatic Hydrocarbons (“PAHs”)

					
	 Benzo[a]anthracene
	  	0.38	  	0.62	 	—  	  	0.38
	 Benzo[a]pyrene
	  	0.038	  	0.062	 	—  	  	0.038
	 Benzo[b]fluoranthene
	  	0.38	  	0.62	 	—  	  	0.38
	 Benzo[k]fluoranthene
	  	0.38	  	0.38	 	—  	  	0.38
	 Chrysene
	  	3.8	  	3.8	 	—  	  	3.8
	 Naphthalene
	  	4.5	  	56	 	—  	  	4.5
	
	 Semivolatile Organic Compounds (“SVOCs”)

					
	 Pentachlorophenol
	  	4.4	  	3	 	—  	  	3
	 bis(2-Ethylhexyl)phthalate
	  	160	  	35	 	—  	  	35
		
	 PCBs
	  	
					
	 Polychlorinated Biphenyls
	  	0.22	  	0.22	 	—  	  	1.0(f)
		
	 Metals
	  	
					
	 Arsenic
	  	5.5	  	0.39	 	5.6	  	5.6
	 Cadmium and compounds
	  	1.7	  	1.7	 	0.7	  	1.7
	 Total Chromium
	  	58	  	210	 	17	  	58
	 Mercury
	  	2.5	  	23 (g)	 	0.1	  	2.5
	 Thallium
	  	1	  	5.2	 	1	  	1

 Notes: 
  

	(a)	List of COPCs is provided in the Human Health Risk Assessment (Mactec, 2003). 

	(b)	The Environmental Screening Level (“ESL”) for surface soil at residential property is from RWQCB (2003). The lower of the screening levels for exposure by direct contact (Table K-1 of the RWQCB document)
and indoor air (Table E-1b) is listed. 

	(c)	The Preliminary Remediation Goal (“PRO”) for residential sites is from U.S. EPA, Region IX (2002). “Cal-modified” PRGs are listed if available.

	(d)	Maximum background metal concentration is based on Table 27 of the Human Health Risk Assessment (Mactec, 2003). 

	(e)	For COPCs other than metals, the soil TCL is the lowest value of the ESL and PRG. For metals, the soil TCL is the lowest value of the ESL and the PRG unless that value is less than the “background” value,
in which case, the soil TCL is the “background” value. 

	(f)	Value is from the Toxic Substances Control Act (“TSCA”) (USC Title 15, Section 2601 et. seq. and 40 CFR 761.1 et. seq.) and Department of Toxic Substances Control (“DTSC”)-established cleanup level
for NASA Ames Research Center (Cal/EPA, 1998). 

	(g)	The PRG for mercury chloride is listed. 

  
 Page 1 of 2 

 TABLE 4 

SOIL TARGET CONCENTRATION LEVELS FOR POLYNUCLEAR
AROMATIC HYDROCARBONS (PAHS), 
 SEMI-VOLATILE
ORGANIC COMPOUNDS (SVOCS), 
 POLYCHLORINATED BIPHENYLS,
AND METALS 
 NASA Research Park 

Moffett Field, California 
 Abbreviations

  

			
	 m bgs = meters below ground surface
	  	 PRG = preliminary remediation goal

	 mg/kg = milligrams per kilogram of soil
	  	 U.S. EPA = U.S. Environmental Protection Agency

	 PCBs = polychlorinated biphenyls
	  	

 References 

Cal/EPA, 1998. Letter from Derek Whitworth to Trudy Papier, NASA Ames Research Center, regarding soil cleanup levels for polychlorinated biphenyls,
10 February 1998. 
 Mactec, 2003. Revised Human Health Risk Assessment, NASA Research Park Moffett Field, California, Mactec, Inc.,
28 July 2003. 
 RWQCB, 2003. Screening For Environmental Concerns At Sites With Contaminated Soil and Groundwater, Interim Final,
California Regional Water Quality Control Board, San Francisco Bay Region, July, 2003. 
 U.S. EPA, 2002. Preliminary Remediation Goals Table,
U.S. EPA, Region IX, http://www.epa.gov/region09/waste/sfund/prg/, updated 1 October 2002. 

  
 Page 2 of 2 

 TABLE 5 

SOIL TARGET CONCENTRATION LEVELS FOR CHLORINATED
VOCS, PETROLEUM 
 HYDROCARBONS, BENZENE, TOLUENE,
ETHYLBENZENE, AND XYLENES 
 NASA Research Park 

Moffett Field, California 
  

							
	 Chemical of Potential Concern
	  	MEW
Record of
Decision (a)
(mg/kg)	 	Navy
Cleanup
Level (b)
(mg/kg)	  	Target
Concentration
Level (“TCL”)
(mg/kg)
	 Chlorinated Volatile Organic Compounds (“VOCs”)

				
	 Chloroform
	  	10 (c)	 	—  	  	10
	 1,2-Dichloroethane
	  	0.05	 	—  	  	0.05
	 1,1-Dichloroethene
	  	0.6	 	—  	  	0.6
	 cis-1,2-Dichloroethene
	  	0.6	 	—  	  	0.6
	 trans-1,2-Dichloroethene
	  	1	 	—  	  	1
	 Methylene chloride
	  	0.5	 	—  	  	0.5
	 Tetrachloroethene (PCE)
	  	0.5	 	—  	  	0.5
	 Trichloroethene (TCE)
	  	0.5	 	—  	  	0.5
	 Vinyl chloride
	  	0.05	 	—  	  	0.05
	
	 Petroleum Hydrocarbons and BTEX

				
	 TPH purgeable as gasoline
	  	—  	 	150	  	150
	 TPH extractable as diesel
	  	—  	 	400	  	400
	 TPH extractable as jet fuel
	  	—  	 	400	  	400
	 Benzene
	  	—  	 	1.5	  	1.5
	 Toluene
	  	—  	 	520	  	520
	 Ethylbenzene
	  	—  	 	230	  	230
	 Xylenes
	  	—  	 	210	  	210

 Notes: 
  

	(a)	Cleanup level is based on the MEW Record of Decision (U.S. EPA, 1989) and is equal to 100 times the current drinking water MCL for California. 

	(b)	Cleanup levels (action levels) for petroleum contamination in soil at Moffett Federal Airfield negotiated by Navy and State of California in 1994 (TetraTech, 1998). 

	(c)	ROD cleanup level for chloroform is based on the current U.S. EPA drinking water MCL. 

 Abbreviations

 BTEX = benzene, toluene, ethylbenzene, xylene 
 MCL =
maximum contaminant level 
 mg/kg = milligrams per kilogram of soil 

VOC = volatile organic compound 
 References 

Tetra Tech, 1998. Final Basewide Petroleum Site Evaluation Methodology Technical Memorandum, Moffett Federal Airfield, California, 2 October
1998. 
 U.S. EPA, 1989. Record of Decisions, Fairchild, Intel, and Raytheon Sites, Middlefield/Ellis/Whisman (MEW) Study Area,
Mountain View, California, May 1989. 

  
 Page 1 of 1 

 [Image FIGURE 1] 
  

 

 [Image FIGURE 2] 
  

 

 [Image FIGURE 3] 
  

 

 [Image FIGURE 4] 
  

 

 [Image FIGURE 5] 
  

 

 [Image FIGURE 6] 
  

 

 [Image FIGURE 7] 
  

 

 [Image FIGURE 8] 
  

 

 [Image FIGURE 9] 
  

 

 [Image FIGURE 10] 
  

 

 [Image FIGURE 11] 
  

 

 [Image FIGURE 12] 
  

 

 [Image FIGURE 13] 
  

 

 [Image FIGURE 14] 
  

 

 [Image FIGURE 15] 
  

 

 [Image FIGURE 16] 
  

 

 [Image FIGURE 17] 
  

 

 [Image FIGURE 18] 
  

 

 [Image FIGURE 19] 
  

 

 APPENDIX A 

MEW Companies/Navy/NASA 

Allocation Area Map 

 [Image EXHIBIT B1] 
  

 

 APPENDIX B 

Mitigated Alternative 5 Land Use Plan from 

Final Programmatic Environmental Impact Statement 

Figure 2.6 from Design, Community, and Environment, NASA Ames Development Plan, Final Programmatic Environmental
Impact Statemen5, NASA Ames Research Center, July 2002 

 [Image FIGURE 2.6] 
  

 

 APPENDIX C 

Selected Plates from 

the Revised Human 
 Mactec, Inc.,
Revised Human Health Risk Assessment, NASA Research Park, Moffett Field, California, 28 July 2003 
 Includes: 

 

	 	$	Plate 8: Indoor Worker RME Risk; 

  

	 	$	Plate 10: Indoor Worker RME HI; 

  

	 	$	Plate 16: Child Resident (10 yr) RME Risk; 

  

	 	$	Plate 18: Child Resident (10 yr) RME HI; 

  

	 	$	Plate 20: Resident (30 yr) RJE Risk; 

  

	 	$	Plate 22: Resident, Child (6 yr) HI, 

 [Image PLATE 8] 
  

 

 [Image PLATE 10] 
  

 

 [Image PLATE 16] 
  

 

 [Image PLATE 18] 
  

 

 [Image PLATE 20] 
  

 

 APPENDIX D 

Agreement for Coordination of Construction 

and MEW Remedial System Modification Work 

NASA Research Park, Moffett Federal Airfield 

 AGREEMENT FOR COORDINATION OF CONSTRUCTION 

AND MEW REMEDIAL SYSTEM MODIFICATION WORK AT 

NASA RESEARCH PARK, AMES RESEARCH CENTER, MOFFETT FIELD, 

CALIFORNIA 
 The National
Aeronautics and Space Administration (“NASA”) enters into this Agreement for Coordination of Construction and MEW Remedial System Modification Work at NASA Research Park, Ames Research Center, Moffett Field, California
(“Agreement”) with Fairchild Semiconductor Corporation, a Delaware corporation, and Raytheon Company, a Delaware corporation (collectively, the “MEW Companies”), and CM SPE, LLC, a Pennsylvania limited liability company
(“Project Developer”). NASA enters into this Agreement pursuant to the authority of the National Aeronautics and Space Act of 1958, as amended, 42 U.S.C. §§ 2451 et seq. 

RECITALS 
 A. On June 9,
1989, the United States Environmental Protection Agency (“EPA”) issued a Record of Decision (the “MEW ROD”) for the Middlefield-Ellis-Whisman area of Mountain View, California. The MEW
ROD was modified in September 1990 and April 1996 by EPA’s Explanations of Significant Differences. The MEW ROD requires the implementation of an EPA-approved regional groundwater remediation program (“RGRP”). 

B. On November 29, 1990, pursuant to Section 106(a) of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as
amended by the Superfund Amendments and Reauthorization Act of 1986 (as so amended, “CERCLA”) (42 U.S.C. § 9606(a)), the EPA issued an Administrative Order for Remedial Design and Remedial Action for the MEW Site to Fairchild
Semiconductor Corporation, Schlumberger Technology Corporation, National Semiconductor Corporation, NEC Electronics, Inc., Siltec Corporation, Sobrato Development Companies, General Instrument Corporation, Tracor X-Ray, Inc., and Union Carbide
Chemicals and Plastics Company Inc. (the “106 Order”). 
 C. On May 9, 1991, pursuant to CERCLA, the EPA entered into a Consent
Decree with Intel Corporation and Raytheon Company to compel them to perform remedial actions at the MEW Site. 
 D. As part of the RGRP,
the MEW Companies have installed, operate, monitor and maintain a groundwater monitoring and remedial system (“Remedial System”) on Moffett Field (“Moffett”) under the direction of EPA. The Remedial System’s components
include, but are not limited to, groundwater monitoring wells, groundwater extraction wells, single and double-contained pipelines, air relief structures, electrical power and instrumentation conduits, fiber-optic instrument systems, electrical
field control panels, leak detection systems, radio frequency communication links, settlement pin monuments and a groundwater treatment system (“GWTS”). The MEW Companies are required by EPA to operate the Remedial System GWTS and
related 

  
 Page 1 of 13 

 
extraction wells and components continuously except during maintenance. Approval for any shutdown of more than 24 hours duration must be obtained from the EPA Remedial Project Manager
(“RPM”) in advance. 
 E. NASA has entered into an agreement with the Project Developer to undertake redevelopment activities
at Moffett in connection with the Project Developer’s lease of certain improvements at Moffett. These activities include, but are not limited to, demolition, grading, trenching and other excavation work, and construction connected with the
development of office, educational, and research and development facilities (collectively, “Project Development”). 
 F. NASA, the
MEW Companies and the Project Developer enter into this Agreement to minimize any impact of Project Development on the operation, monitoring, maintenance and modification of the Remedial System and to allow MEW Companies and the EPA access to the
Remedial System during and after Project Development; and to delineate the roles and responsibilities for managing contaminated soil and groundwater that is excavated during the Project Development. NASA, the MEW Companies and the Project
Developer recognize that, to coordinate Project Development and the continued operation of the Remedial System effectively, it will be necessary for NASA, the Project Developer and the MEW Companies to be in regular, frequent communication. 

G. The Parties to this Agreement all agree that all actions to be taken hereunder shall be in compliance with all applicable laws and, to the
extent required by law, will receive the approval of all state and federal agencies having jurisdiction over ) such actions. 
 NOW,
THEREFORE, NASA, Project Developer and the MEW Companies agree as follows: 
 AGREEMENT 

 

	 	1.	Geographic Scope of Agreement 

 This Agreement applies only within those geographical
parts of Moffett that are or will be physically affected by the construction work performed by the Project Developer in connection with the Project Development and located within the areas designated as AR-1 and AR-3 on the attached Figure 1,
together with other areas that may be affected by extensions of portions of the Remedial System that extend from AR-1 and/or AR-3. 
  

	 	2.	Scheduling of Work 

 The Project Developer shall meet with the MEW Companies as early as
possible during Project Development planning to coordinate Project Development with the operation, monitoring, maintenance and modification of the Remedial System. Detailed drawings showing the locations of the Remedial System components shall
be provided by the MEW Companies to the Project Developer in CAD form so they can be integrated into the Project Developer’s plans.· 

  
 Page 2 of 13 

	 	3.	Remedial System Protection and Modification; Exacerbation of Contamination 

 During
Project Development, (i) the Project Developer shall protect the integrity of all components of the Remedial System and shall take all reasonable measures to minimize Remedial System downtime, in each case to the extent the Remedial System may be
affected as a result of the Project Development, and (ii) the MEW Companies shall operate the Remedial System in a manner that, to the extent reasonably possible and subject to the express requirements of this Agreement, minimizes interference with
the ongoing Project Development. After completion of Project Development, the MEW Companies both (a) shall protect the integrity of all components of facilities resulting from the Project Development and (b) shall take all reasonable measures to
minimize interference with the Project Developer’s use of its facilities, in each case to the extent they may be affected as a result of the operation of the Remedial System, provided that the MEW Companies shall not be required to relocate
components of the Remedial System as they exist on the date of this Agreement. The Project Developer shall pay any costs of relocation, replacement, alteration, protection, modification, or repair of the Remedial System caused by Project
Development, to the extent any such relocation, replacement, alteration, protection, modification or repair is required by applicable laws and/or is required for the Remedial System to operate in substantially the same manner it operated prior to
any such relocation, replacement, alteration, protection, modification or repair caused or necessitated by the Project Development. In addition, if the Project Developer damages any Remedial System component in a manner that causes a release of
untreated groundwater or soil or if the Project Developer exacerbates existing soil or groundwater contamination, the Project Developer shall pay all costs of investigation, remediation, EPA oversight, and any penalties associated with such release
or exacerbation. The design and construction of any modification to the Remedial System shall be performed by the MEW Companies; all modification costs, including EPA oversight costs, shall be paid by the Project Developer, subject to Section 18.

  

	 	4.	Well Protection 

 The Project Developer shall repair any damage to Remedial System wells
caused by Project Development. Prior to the initial Project Development demolition or construction field work, the MEW Companies shall field locate all Remedial System wells. Prior to the start of Project Development field work, the Project
Developer shall install brightly painted steel pipes over each Remedial System monitoring and extraction well designated by the MEW Companies. The painted pipe shall extend above ground not less than four feet, so as to be highly visible, and shall
be buried sufficiently below the ground surface to protect the wellhead. Alternative equivalent well protection measures may be used by the Project Developer provided the MEW Companies approve any alternative protective measure in writing prior to
its use. 
 Additionally, all Project Development work within two (2) feet of Remedial System wells shall be performed manually with hand
tools. Fine grading work performed in areas more than two feet from the Remedial System wells but within close proximity shall be performed by light grading equipment. 

  
 Page 3 of 13 

	 	5.	Well Sealing and Well Replacement 

 If the Project Developer determines that a Remedial
System well conflicts pay all costs of well sealing and replacement and all related MEW Companies’ costs, with the planned Project Development and must be removed, the Project Developer shall including but not limited to the cost of installing
replacement conduit, piping, boxes, controls and all other components needed to return a well to service, developing the well, conducting a baseline first round of groundwater sampling, and preparing all required plans, surveys and reports. The
Project Developer shall be responsible for sealing all wells located within 15 feet of the outer wall of a new building. No well shall be sealed or relocated without the prior written approval of the EPA RPM. Well sealing and installation shall
comply with Santa Clara Valley Water District (“SCVWD”) guidance and take place under SCVWD permit. Coordination with EPA and well sealing and replacement shall be performed by the MEW Companies, at the Project Developer’s sole cost,
subject to Section 18. 
  

	 	6.	Remedial System Pipeline Protection and Replacement 

 Prior to initial Project
Development field work, the Project Developer shall provide and place steel plate or equivalent protective measures over the existing MEW Companies’ pipelines and power and control conduits. If the Project Developer determines that a pipeline
conflicts with the planned Project Development and must be removed and relocated, the Project Developer shall pay all costs related to pipeline removal and replacement, including but not limited to design, permitting, review, inspection,
construction and independent quality assurance inspection costs. The Project Developer shall be responsible for removing and relocating all pipelines located within five feet of the outer edge of the footing or foundation of a new building. No
pipeline shall be relocated without the prior approval of the EPA RPM. Replacement pipeline installation procedures shall also be approved by the EPA RPM. Coordination to obtain EPA approval, and pipeline removal and replacement work, shall be
performed by the MEW Companies at the Project Developer’s cost, subject to Section 18. 
  

	 	7.	Notification of Shutdown of Groundwater Extraction Wells or GWTS 

 If, during Project
Development, the Project Developer believes it to be necessary that either a Remedial System extraction well or the GWTS be shut down, the Project Developer shall make written request of same to the MEW Companies no later than five (5) working days
in advance of the proposed shutdown. If such shutdown does not require EPA approval, the MEW Companies shall, within five (5) working days of receipt of the Project Developer’s written request, notify Project Developer in writing either
that (a) the MEW Companies consent to such request, including information on the anticipated timing of the shutdown or (b) the MEW Companies do not consent to such request and the reason(s) for such refusal. If such shutdown does require EPA
approval, the MEW Companies shall, promptly upon receipt of the Project Developer’s written 

  
 Page 4 of 13 

 
request, make appropriate application to EPA for its consent and shall notify the Project Developer of EPA’s response within one (1) working day of its receipt of EPA’s response or,
failing a response from EPA within fifteen (15) working days, shall notify the Project Developer of EPA’s lack of response and any additional steps the MEW Companies have taken to elicit a response. In the event of an inadvertent shutdown of
any component of the Remedial System, the Project Developer shall give immediate verbal notice to the MEW Companies, and the MEW Companies shall be responsible for any required notice to EPA pursuant to the 106 Order. Additionally, the Project
Developer shall provide to the MEW Companies a written explanation of the reason for and the duration of any inadvertent shutdown within 48 hours of the shutdown. 
  

	 	8.	Access to Wells and the GWTS 

 Project Development shall be performed in such a way that
all Remedial System wells, pull boxes and the GWTS and associated components remain accessible to the EPA and the MEW Companies and their equipment for sampling, operation, maintenance, removal and replacement of pumps, and well sealing to the
maximum extent practicable during and after Project Development. If it becomes necessary to restrict access to a well or other Remedial System component during Project Development, the Project Developer shall provide written notice to the MEW
Companies five working days in advance of creating the restriction, with an explanation of the reason for and the expected duration of the proposed restricted access. Prior to the initial Project Development field work, the MEW Companies shall
provide the Project Developer with the schedule for well sampling. 
  

	 	9.	Modifications to Well Vaults and Wellheads 

 Following completion of final grade by the
Project Developer, the MEW Companies shall modify the MEW wells, well vaults, and pull boxes as needed based on the final grade established by the Project Developer. All costs associated with these modifications shall be paid by the Project
Developer, subject to Section 18. 
  

	 	10.	Communications 

 The Project Developer, all of its contractors, the MEW Companies, all
of their contractors, and NASA shall each designate in writing a primary and alternate contact person, including all applicable mailing addresses, telephone numbers, email addresses and facsimile numbers. The MEW Companies shall have sole authority
and responsibility for all communications with EPA regarding the Remedial System, including its operating status, any Project Development-related shutdowns and any modifications. The Project Developer shall provide the MEW Companies with all
demolition, grading and construction work schedules, a full set of civil, landscaping, foundation and utility plans and specifications, and updates to these plans and specifications and schedules promptly as they occur. The MEW Companies and their
contractor shall be notified of and invited to weekly construction meetings that pertain to these plans and schedules. 

  
 Page 5 of 13 

	 	11.	Monitoring and Sampling of Excavated Soil 

 The Project Developer or NASA shall monitor
all excavated soil to determine if the soils contain volatile organic compounds (“VOCs”) or petroleum constituents. Vadose zone soils shall be stockpiled and managed separately from saturated zone soils. The Project Developer shall remove
and segregate concrete, asphalt, wood, piping and other demolition debris from soil and shall manage and dispose of demolition debris in accordance with all applicable regulations. The Project Developer shall pay all costs related to demolition
debris disposal. 
 NASA, at the Project Developer’s expense and in compliance with applicable laws, shall monitor and sample soils
generated from trenching and other excavation work throughout trenching and excavation activities. The soil being removed shall be visually observed for evidence of discoloration or staining. Soil exhibiting these characteristics shall be analyzed
using an organic vapor analyzer (“OVA”) or equivalent device before stockpiling. Excavated soil shall be field-screened using an OVA (or equivalent) to determine if the excavated soils are clean or may be chemically affected. Field
screening shall be performed in a manner acceptable to EPA, which the Project Developer, NASA and the MEW Companies currently expect will be performed with an OVA (or equivalent) at a rate of one soil sample for every 15 cubic yards of excavated
soil. Excavated soils that show a continuous reading of five parts per million (“ppm”) or greater for at least ten seconds using the OVA (or equivalent) shall be considered as possibly containing chemicals, and shall be segregated. NASA
shall transfer soil exhibiting these characteristics to a plastic-lined stockpile area in or near the area of trenching or excavation. Soil samples shall be collected from random locations within the stockpile at a rate of two samples for every 50
cubic yards of stockpiled soil. Each of the two samples shall consist of at least five composite samples representative of the stockpiled soil. The samples shall be submitted to a state-certified laboratory and analyzed using EPA Method 8260 (or its
superceding EPA Method), including cis-1, 2-dichloroethene and Freon 113 and EPA Method 8015 (or its superceding EPA Method) for high and low boiling point total petroleum hydrocarbons (“TPH”). After the soil has been verified to conform
to the soil cleanup standards specified in the MEW ROD, the soils may be used for on-site cover or backfill. Clean soil that is tested using the field head space method with an OVA (or equivalent) that does not have a reading greater than five ppm
for at least ten seconds also may be used for on-site cover or backfill. Soil that does not qualify as clean soil shall be managed in accordance with Sections 13.2 through 13.6 of this Agreement. 

 

	 	11.1	Excavated Soil Classification and Monitoring Procedure 

 The Project Developer or NASA
shall monitor excavated soil with an OVA (or equivalent) to determine if the soils are clean or may contain chemicals, as defined below: 

Clean Soil: Soil that does not have a reading greater than five ppm continuously for ten seconds using the field head space method with an
OVA (or equivalent) specified below will be considered clean soil. 

  
 Page 6 of 13 

 Soil Containing Chemicals: Soil that does not meet the definition of clean soil will
be considered soil containing chemicals. 
  

	 	11.2	Field Head Space Methods: 

 (a) A soil sample shall be taken from excavated soil in the
backhoe bucket at a point out of the excavation. 
 (b) The soil to be tested shall be placed into an unused re-sealable plastic bag or
clean mason jar container with a minimum volume of one quart or one liter, until the container is half full. 
 (c) The container shall be
sealed and left to sit under direct sunlight for approximately five minutes. 
 (d) The container shall be opened just enough to allow the
probe of the OVA (or equivalent) to be inserted into the container’s headspace. 
 (e) Any sample having a reading of five ppm or
greater continuously for at least ten seconds shall be considered soil containing chemicals. 
  

	 	12.	Notification of Saturated Soil Containing VOC 

 If VOCs are determined to exist in
saturated zone soils, the Project Developer shall immediately notify the MEW Companies’ representative. 
  

	 	13.	Management and Disposition of Soils 

  

	 	13.1	Clean Soil 

 NASA shall be responsible for the determination as to whether soil
qualifies as clean soil either because it has been classified as clean soil in accordance with Section 11.1 of this Agreement or has been treated to the soil cleanup standards specified in the MEW ROD. Clean soil that does not require treatment
may be reused for cover or backfill or shall be transported to the open field north of Electrical Substation West (N225A) on Moffett, shown as Area A on the attached Figure 2, or to other areas on Moffett designated by NASA, and spread by the
Project Developer at the Project Developer’s cost. NASA and the Project Developer agree that the MEW Companies shall not be responsible for (a) .any determination made by NASA or the Project Developer that any soil qualifies as clean soil
or that any soil may be used for any particular purpose at any particular location on Moffett, or (b) any other actions or omissions by NASA or the Project Developer with respect to their respective handling of soils pursuant to this Agreement. 

 

	 	13.2	Vadose Zone Soils and Saturated Soils Containing TPH 

 Vadose zone and saturated
soils containing TPH from AR-1 (whether or not they also contain VOCs) shall be transported by the Project Developer to the 

  
 Page 7 of 13 

 
bioremediation pad on the east side of Moffett, as shown on Figure 3, or to other areas on Moffett designated by NASA, and shall be managed by NASA in accordance with the procedures specified in
the document entitled “Coordination of Construction and Navy Remedial System Modification Work.” 
 Vadose zone and saturated
soils containing TPH from AR-3 (whether or not they also contain VOCs) shall be transported by the Project Developer to the bioremediation pad at the northwest comer of Moffett, shown as Area C on Figure 2, or to other areas on Moffett designated by
NASA, and shall be managed by NASA. 
  

	 	13.3	Saturated Zone Soils Containing Only VOCs 

 The Project Developer shall notify
the MEW Companies promptly if any saturated zone soil in AR-1 or AR-3 is determined by analytical testing to contain only those VOCs associated with the MEW plume at concentrations exceeding MEW ROD soil cleanup standards. The MEW Companies shall
manage and dispose of these soils at their cost. The Project Developer or NASA shall promptly make available to the MEW Companies copies of analytical soil data. Following review of the data, any soils that are found to be the responsibility of the
MEW Companies shall be delivered by the Project Developer to a soil aeration facility on Moffett at the location shown as Area B on Figure 2 (the “MEW Soil Aeration Facility”) and treated and/or disposed of by the MEW Companies. Treatment
or offsite disposal of the soil ,shall be at the discretion and timing of the MEW Companies, in accordance with CERCLA Section 121(d). If treated, the soils shall be treated to the soil cleanup standards specified in the MEW ROD. The Project
Developer shall pay all costs of excavating and delivering the soil to the MEW Soil Aeration Facility. The MEW Companies shall pay all costs of treating the soil and spreading the treated soil on-site or disposing of it offsite. If the MEW Companies
elect to dispose of soil offsite, the MEW Companies shall select the offsite disposal site in accordance with CERCLA Section 121(d), subject to NASA’s approval, which shall not be withheld unreasonably, and NASA shall be designated the
generator and sign all necessary waste manifests. 
  

	 	13.4	Polyethylene Liners 

 The Project Developer shall provide plastic liners and
covers for the soil stockpiles located in the areas of trenching and excavation. The MEW Companies shall provide liners and covers for the soil at the MEW Soil Aeration Facility. The location of the soil stockpiles in the areas of trenching and
excavation shall be designated by NASA. 
  

	 	13.5	MEW Soil Aeration Facility Sampling and Testing Procedures 

 Following aeration
of soils treated by the MEW Companies pursuant to Section 13.3, the MEW Companies shall collect two discrete soil samples for every 50 cubic yards of treated soil. Each of the two samples shall consist of at least five composite samples
representative of the treated soil. The samples shall be analyzed using EPA Method 8260 (or its superceding EPA Method), including cis-1,2-dichloroethene and Freon. 

  
 Page 8 of 13 

	 	13.6	On-Site Reuse 

 After soil aerated by the MEW Companies has been determined to
meet soil cleanup standards, the MEW Companies shall move the clean soil onto the open field adjacent to the MEW Soil Aeration Facility and spread it in a manner that effectively separates the clean soil from any soil remaining at or brought to the
MEW Soil Aeration Facility for treatment. 
  

	 	13.7	Soil Management 

 All soil management plans (including, without limitation, those
for screening, testing, treating and disposing of soils) shall be performed in accordance with EPA-approved plans to the extent required by the 106 Order. 
  

	 	14.	Management and Discharge of Groundwater Generated During Excavation and Dewatering Activities 

The Project Developer may be required to dewater pipeline trenches and other excavations and convey water away from excavations. Groundwater
in the area of Project Development may contain VOCs or TPH. The Project Developer shall manage, contain and discharge all water removed from excavation areas. The Project Developer shall transport the water to above ground tanks, test the water by
EPA Method 8260 and EPA Method 8015 (or their superceding EPA Methods) and discharge the water as follows: 
  

	 	14.1	Ground Water Containing TPH 

 If the groundwater from AR-1 contains TPH above 50
parts per billion (“ppb”) (or such lower standard as may in the future be established by EPA), as determined by EPA Method 8015 (or its superceding EPA Method), it shall not be discharged to the Remedial System GWTS. The Project Developer
shall obtain all necessary approvals for discharge of such groundwater at alternate sites. (Depending on the chemical concentrations, the Project Developer may be able to obtain permission from the City of Sunnyvale Waste Water Treatment Plant or
the City of Palo Alto Waste Water Treatment Plant to discharge the water to the NASA sanitary sewer systems.) The water shall be filtered before any discharge to the sewer system and the solids stored and subsequently managed by the Navy in
accordance with the document entitled “Coordination·of Construction and Navy Remedial System Modification Work.” 
 If the
groundwater from AR-1 contains TPH above 50 ppb, and cannot be discharged to the sanitary sewer, the Project Developer shall deliver it to the Navy’s Westside Aquifer Treatment System on Moffett for treatment by the Navy. 

If the groundwater from AR-3 contains TPH above 50 ppb, as determined by EPA Method 8015 (or its superceding EPA Method), it shall not be
discharged to the Remedial System GWTS. The Project Developer shall obtain all necessary approvals for discharge of such groundwater at alternate sites. (Depending on the chemical concentrations, the Project Developer may be able to obtain
permission from the City of 

  
 Page 9 of 13 

 
Sunnyvale Waste Water Treatment Plant or the City of Palo Alto Waste Water Treatment Plant to discharge the water to the NASA sanitary sewer systems.) The water shall be filtered before any
discharge to the sewer system and the solids stored and subsequently managed by the Navy in accordance with the document entitled “Coordination of Construction and Navy Remedial System Modification Work.” 

If the groundwater from AR-3 contains TPH above 50 ppb, and cannot be discharged to the sanitary sewer, the Project Developer shall deliver
it to NASA’s RGRP Treatment System on Moffett for treatment by NASA. 
  

	 	14.2	Groundwater Containing VOCs 

 If the groundwater from AR-I or AR-3 contains TPH
below 50 ppb (or such lower standard as may in the future be established by EPA) and contains VOCs that are identified as those associated with the MEW plume, the groundwater can be discharged, if acceptable to EPA (to the extent EPA approval is
required by the 106 Order), to the Remedial System GWTS. If EPA approves (if such approval is so required), then the Project Developer shall deliver the groundwater to clean Baker or similar tanks adjacent to the Remedial System GWTS at the location
shown as the MEW Baker Tank Staging Area on Figure 4. The Project Developer shall inspect and sample the storage tanks before using them to insure that they are clean. Sample results shall be provided to the MEW Companies, and the MEW Companies
shall have an opportunity to inspect the tanks before their use. Treatment and discharge of groundwater through the Remedial System GWTS shall be performed by the MEW Companies. All groundwater shall be filtered before it is pumped into the clean
storage tanks to minimize sediment buildup in the storage tanks. All solids removed from the groundwater and any filters shall be stored and subsequently characterized, managed and disposed of in the same manner as contaminated soils as specified in
Sections 11 through 13 of this Agreement. NASA shall be designated the generator and shall sign all necessary waste manifests for the solids and filter wastes. The Project Developer shall pay all costs associated with extraction, delivery and
storage of groundwater prior to treatment at the GWTS. The MEW Companies shall pay all costs of pumping the groundwater from the storage tanks and treating it through the Remedial System GWTS. The MEW Companies shall treat the stored water within a
reasonable timeframe. 
  

	 	15.	Contractor Compliance With This Agreement 

 NASA, the MEW Companies, and the Project
Developer each shall provide a copy of this Agreement to their respective contractors and subcontractors and shall ensure that compliance with this Agreement is made a material part of their respective agreements with their contractors and
subcontractors. 
  

	 	16.	NASA Appropriations 

 NASA agrees to use its best efforts in the performance of this
Agreement. However, all NASA activities under or pursuant to this Agreement are subject to the availability of appropriated funds. No provision of this Agreement shall be interpreted 

  
 Page 10 of 13 

 
as, or constitute, a commitment or requirement that NASA or any other Federal Agency obligate or pay funds in contravention of the Anti-Deficiency Act, 31 U.S.C. 1341. Notwithstanding the
foregoing, NASA agrees that, during the period in which this Agreement remains operative, NASA will be diligent in seeking appropriation of funds for the purpose of performing NASA’s obligations set forth in this Agreement. 

 

	 	17.	Notices 

 All written notices required by this Agreement shall be deemed effective
(1) when delivered, if personally delivered to the person being served or (2) three business days after deposit in the mail if mailed by United States mail, postage paid certified, return receipt requested: 

If To: “Project Developer”: 

CM SPE, LLC 
 5000 Forbes
Avenue 
 Pittsburgh, PA 15213 

Attn: Duane A. Adams 

Facsimile: (412) 268-2990 

If To: “MEW Companies” 

Fairchild Semiconductor Corporation 

Clifford E. Kirchof 

Remediation Manager 

Schlumberger Limited 
 225 Sugar
Land 
 Drive Sugar Land, TX 77478 

Facsimile: (281) 285-8597 

Jeffrey B. Axelrod, Esq. 

Senior Counsel 
 Raytheon
Corporation 
 141 Spring Street 

Lexington, MA 02421 
 Facsimile:
(781) 860-2788 
 If To: ‘‘NASA” 

Mr. Don Chuck 
 NASA Ames
Research Center 
 MS 218-1 

Moffett Field, CA 94035 

Facsimile: (650) 604-0680 

  
 Page 11 of 13 

	 	18.	Review/Audit of MEW Costs 

 With respect to any and all work to be performed by the MEW
Companies hereunder at Project Developer’s cost, including, without limitation, work performed pursuant to Sections 3, 5, 6 and 9 hereof: 

18.1 All such work shall be conducted only to the extent required by applicable laws and/or to enable the Remedial System to operate in
substantially the manner it operated prior to any damage, modification or alteration caused or required by the Project Development, and all costs related to such work shall be commercially reasonable and subject to Project Developer’s prior
approval in accordance with this Section 18, which approval shall not be unreasonably withheld or delayed; 
 18.2 Prior to commencing such
work and incurring such costs, the MEW Companies shall provide to Project Developer a detailed description of such work and cost estimates and such back-up documentation as Project Developer may reasonably request, and Project Developer shall be
given an opportunity to recommend revisions or modifications to such scope of work and cost estimates. Project Developer shall either approve or disapprove (with reasonable detail as to grounds for disapproval) such work scope and cost estimate
within thirty (30) days after receipt of same, unless sooner approval or disapproval is required for emergency repairs, in which case Project Developer shall respond as promptly as reasonable practicable; 

18.3 After completing such work and incurring such costs, the MEW Companies shall provide to Project Developer paid invoices and such other
evidence of payment of such costs previously approved by Project Developer as Project Developer may reasonably request; and 
 18.4 Project
Developer shall have a period of thirty (30) days after submission of such proof of payment to review such costs and the work performed and, at Project Developer’s sole option and expense, to complete an audit of the MEW Companies’ records
with respect to such costs and work performed. If, as a result of such review and/or audit, Project Developer determines that any such work and/or costs are outside the scope of Project Developer’s responsibility hereunder and/or were not
approved by Project Developer as required hereunder, then Project Developer shall so notify the MEW Companies and the parties shall attempt to resolve such dispute extrajudicially. If the Project Developer and MEW Companies are unable to resolve
such dispute extrajudicially, then either party may pursue any available remedy pursuant to applicable law or, by mutual agreement, may submit the dispute to such alternative dispute resolution procedure as may be mutually acceptable. 

 

	 	19.	Effective Date 

 This Agreement shall take effect on January 8, 2003. 

  
 Page 12 of 13 

 IN WITNESS THEREOF, the following parties have entered into this Agreement. 

 

									
	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION	 	
					
	By:	 	  
	 		 	Dated:	 	  

		 	G. Scott Hubbard	 		 		 	
	Title:	 	Director, Ames Research Center	 		 		 	
				
	CM SPE, LLC	 		 		 	
					
	By:	 	  
	 		 	Dated:	 	  

		 	Duane Adams	 		 		 	
	Title:	 	President and CEO	 		 		 	
				
	RAYTHEON COMPANY	 		 		 	
					
	By:	 	  
	 		 	Dated:	 	  

	Title:	 		 		 		 	
				
	FAIRCHILD SEMICONDUCTOR CORPORATION	 		 		 	
					
	By:	 	  
	 		 	Dated:	 	  

	Title:	 	  
	 		 		 	

  
 Page 13 of 13 

 EXHIBIT O 

REQUIREMENTS AND PROCEDURES FOR COORDINATION OF CONSTRUCTION AND NAVY RE: MEDIAL SYSTEM MODIFICATION WORK AT NASA RESEARCH PARK, AMES RESEARCH
CENTER, MOFFETT FIELD, CALIFORNIA 
 The National Aeronautics and Space Administration (‘‘NASA”) will enter into a certain
Agreement for Coordination of Construction and Navy Remedial System Modification Work at the proposed NASA Research Park (‘‘NRP”), Ames Research Center, Moffett Field, California (“Agreement”) with the United States Navy.
The following recitals, requirements and procedures are taken from the proposed Agreement and will be followed by NASA, the Navy and CM SPE, LLC (“CM SPE”) in regard to the activities under Article 26 of the Lease. 

RECITALS 
 A. On June 9,
1989, the U1:1ited States Environmental Protection Agency (“EPA”) issued a Record of Decision (the “MEW ROD”) for the Middlefield-Ellis-Whisman area of Mountain View, California. The MEW
ROD was modified in September 1990 and April 1996 by EPA’s Explanations of Significant Differences. The MEW ROD requires the implementation of an EPA-approved regional groundwater remediation program (“RGRP”). 

B. In September, 1990, a Federal Facility Agreement (“FFA”) under CERCLA Section 120 was signed by the EPA, the Navy, and the State
of California, represented by the California Department of Health Services (“DHS”), and the California Regional Water Quality Control Board (“RWQCB”). The FFA states the Navy’s responsibilities for the investigation and
remediation of contaminated soil and groundwater within the proposed NRP area. 
 C. On December 22, 1992, the Navy and NASA signed a
Memorandum of Understanding (“MOU”) that stated the Navy would continue to be responsible for the investigation and remediation of its environmental contamination after the transfer of the 

  
 1 

 
former Naval Air Station Moffett Field to NASA. In addition to the groundwater contamination, the MOU includes Navy responsibility for petroleum contamination in the soil and groundwater, and for
lead in the soil caused by lead based paint on the buildings. This MOU was further clarified by the Navy in a letter signed on October 4, 1993, which stated that “The Navy’s obligations under the MOU shall include taking possession of, and
properly managing any contaminated soil or groundwater that has been left in place in accordance with a CERCLA, RCRA, or other cleanup remedy but subsequently upon its excavation, disturbance, or discharge by NASA during development for reuse of
Moffett Field becomes hazardous waste, or requires treatment prior to discharge.” 
 D. On December 17, 1993, EPA signed the Moffett
Field FFA amendment, which had already been signed by the Navy, the California Department of Toxic Substance Control (“DTSC”) and the RWQCB. In this FFA amendment, the Navy adopted the MEW ROD for the remediation of soil and groundwater
contaminated with chlorinated solvents within the proposed NRP area. 
 E. By 1998, the Navy, NASA, and the MEW Companies had agreed in
principle to an allocation and settlement of each party’s responsibilities for the RGRP. NASA and the MEW Companies signed this Allocation and Settlement Agreement on March 16, 1998. 

F. As part of the RGRP, the MEW Companies have installed, operate, monitor and maintain a groundwater monitoring and remedial system on
Moffett Field (“Moffett”) under the direction of EPA. These components include, but are not limited to, groundwater monitoring wells, groundwater extraction wells, single and double-contained
pipelines, air relief structures, electrical power and instrumentation conduits, fiber-optic instrument systems, electrical field control panels, leak detection systems, radio frequency communication links, settlement pin monuments and a groundwater
treatment system (“GWTS”). The MEW Companies are required by EPA to operate the GWTS and related extraction wells and components continuously except during maintenance. Approval for any shutdown of more than 24 hours duration must be
obtained from the EPA Remedial Project Manager (“RPM”) in advance. 

  
 2 

 G. Pursuant to its FFA, the Navy has installed, operates, monitors and maintains a groundwater
monitoring and remedial system, the Westside Aquifer Treatment System (“WATS”) on Moffett under the direction of EPA and the RWQCB. The WATS’ components include, but are not limited to, groundwater monitoring wells, groundwater
extraction wells, pipelines, air relief structures, electrical power and instrumentation conduits, fiber-optic instrument systems, electrical field control panels, leak detection systems, settlement pin monuments and a groundwater treatment system.
The Navy is required by EPA to operate the WATS and related extraction wells and components continuously except during maintenance. Approval for any shutdown of more than 24 hours duration must be obtained from the EPA RPM in advance. 

H. The Navy is also responsible for investigation and remediation of petroleum sites at Moffett, with oversight by the RWQCB. The Navy had
installed a treatment system at Site 14 South to address petroleum contamination. The Navy had also installed an Iron Curtain demonstration project west of Hangar 1. 

I. NASA plans to sign separate agreements with the MEW Companies and each “Project Developer” (including CM SPE) to undertake
redevelopment activities at Moffett in connection with the Project Developers’ leases of certain improvements at Moffett. These activities include, but are not limited to, demolition, grading, trenching and other excavation work, and
construction connected with the development of office, educational, and research and development facilities (collectively, “Project Development”). 

J. NASA and the Navy will enter into the Agreement to minimize any impact of Project Development on the operation, monitoring, maintenance and
modification of the WATS and to allow Navy access to the WATS during and after Project Development; and to clarify the roles and responsibilities for managing contaminated soil and groundwater that is excavated during the Project Development. NASA
and the Navy recognize that, to coordinate Project Development and the continued operation of the WATS effectively, it will be necessary for NASA and the Navy to be in regular, frequent communication. 

  
 3 

 REQUIREMENTS AND PROCEDURES 

FOR NASA, THE NAVY AND CM SPE 
  

	 	1.	Geographic Scope of Agreement 

 These Requirements and Procedures apply only within those
geographical parts of Moffett designated as AR-1, AR-2, and AR-6 on the attached Figure 1. 
  

	 	2.	Scheduling of Work 

 NASA shall meet with the Navy as early as possible during Project
Development planning to coordinate Project Development with the operation, monitoring, maintenance and modification of the WATS and any petroleum site or other remedial work (collectively, the “Remedial System”). Detailed drawings showing
the locations of the WATS and any other treatment system components shall be provided by the Navy to NASA in CAD form so they can be integrated into the Project Developer’s plans. 

 

	 	3.	Remedial System Protection and Modification; Exacerbation of Contamination 

 The Project
Developer shall protect the integrity of all components of the Remedial System during Project Development and shall take all reasonable measures to minimize Remedial System downtime. The Project Developer shall pay any costs of relocation,
replacement, alteration, protection, modification, or repair of the Remedial System caused by Project Development. In addition, if the Project Developer damages any Remedial System component in a manner that causes a release of untreated groundwater
or soil or if the Project Developer exacerbates existing soil or groundwater contamination, the Project Developer shall pay all costs of investigation, remediation, EPA oversight, and any penalties associated with such release or exacerbation. The
design and construction of any modification to the Remedial System shall be performed by the Navy contractors, under separate contract to the Project Developer; all modification costs, including EPA oversight costs, shall be paid by the Project
Developer. 
  

	 	4.	Well Protection 

 The Project Developer shall repair any damage to Remedial System wells
caused by Project Development. Prior to the initial Project Development demolition or construction fieldwork, the Navy shall field locate all Remedial System wells. Prior to 

  
 4 

 
the start of Project Development fieldwork, the Project Developer shall install brightly painted steel pipes over each Remedial System monitoring and extraction well designated by the Navy. The
painted pipe shall extend above ground not less than four feet, so as to be highly visible, and shall be buried sufficiently below the ground surface to protect the wellhead. Alternative equivalent well protection measures may be used by the Project
Developer provided the Navy approves any alternative protective measure in writing prior to its use. 
 Additionally, all Project
Development work within two feet of Remedial System wells shall be performed manually with hand tools. Fine grading work performed in areas more than two feet from the Remedial System wells but within close proximity shall be performed by light
grading equipment. 
  

	 	5.	Well Sealing and Well Replacement 

 If the Project Developer determines that a Remedial
System well conflicts with the planned Project Development and must be removed, the Project Developer shall pay all costs of well sealing and replacement and all related Navy costs, including but not limited to the cost of installing replacement
conduit, piping, boxes, controls and all other components needed to return a well to service, developing the well, conducting a baseline first round of groundwater sampling, and preparing all required plans, surveys and reports. The Project
Developer shall be responsible for sealing all wells located within 15 feet of the outer wall of a new building. No well shall be sealed or relocated without the prior written approval of the EPA and RWQCB RPMs. Well sealing and installation shall
comply with Santa Clara Valley Water District (“SCVWD”) guidance and take place under SCVWD permit. Coordination with EPA and the RWQCB, and well sealing and replacement, shall be performed by the Navy’s contractor, under separate
contract with the Project Developer, at the Project Developer’s sole cost. 
  

	 	6.	Remedial System Pipeline Protection and Replacement 

 Prior to initial Project
Development field work, the Project Developer shall provide and place steel plate or equivalent protective measures over the existing Navy pipelines and power and control conduits. If the Project Developer determines that a pipeline, or other
treatment system component, conflicts with the planned Project 

  
 5 

 
Development and must be removed and relocated, the Project Developer shall pay all costs related to pipeline, and other treatment system component, removal and replacement, including but not
limited to design, permitting, review, inspection, construction and independent quality assurance inspection costs. The Project Developer shall be responsible for removing and relocating all pipelines and other components located within five feet of
the outer edge of the footing or foundation of a new building. No pipeline or other component shall be relocated without the prior approval of the EPA and RWQCB RPMs. Replacement pipeline installation procedures shall also be approved by the
EPA and RWQCB RPMs. Coordination to obtain the approval of EPA and the RWQCB, and pipeline removal and replacement work, shall be performed by the Navy’s contractor, under separate contract to the Project Developer, at the Project
Developer’s cost. 
  

	 	7.	Notification of Shutdown of Groundwater Extraction Wells or GWTS 

 If it appears
necessary to shut down a Remedial System extraction well or the WATS during Project Development, NASA shall give written notice to the Navy five working days in advance of the proposed shutdown. In the event of an inadvertent shutdown of any
component of the Remedial System, the Project Developer shall give immediate verbal notice to the Navy. Additionally, NASA shall provide to the Navy a written explanation of the reason for and the duration of any inadvertent shutdown within 48 hours
of the shutdown. 
  

	 	8.	Access to Wells and the GWTS 

 Project Development shall be performed in such a way that
all Remedial System wells, pull boxes and the WATS and associated components remain accessible to the EPA, RWQCB, and the Navy and their equipment for sampling, operation, maintenance, removal and replacement of pumps, and well sealing to the
maximum extent practicable during and after Project Development. If it becomes necessary to restrict access to a well or other Remedial System component during Project Development, NASA shall provide written notice to the Navy five working days in
advance of creating the restriction, with an explanation of the reason for and the expected duration of the proposed restricted access. Prior to the initial Project Development fieldwork, the Navy shall provide NASA with the schedule for well
sampling. 

  
 6 

	 	9.	Modifications to Well Vaults and Wellheads 

 Following completion of final grade by the
Project Developer, the Navy’s contractor, under separate contract to the Project Developer, shall modify the Navy wells, well vaults, and pull boxes as needed based on the final grade established by the Project Developer. All costs associated
with these modifications shall be paid by the Project Developer. 
  

	 	10.	Communications 

 The Project Developer, all of its contractors, the Navy, all of their
contractors, and NASA shall each designate in writing a primary and alternate contact person, including all applicable mailing addresses, telephone numbers, email addresses and facsimile numbers. The Navy shall have sole authority and responsibility
for all communications with EPA and RWQCB regarding the Remedial System, including its operating status, any Project Development-related shutdowns and any modifications. NASA shall provide the Navy with all demolition, grading and construction work
schedules, a full set of civil, landscaping, foundation and utility plans and specifications, and updates to these plans and specifications and schedules promptly as they occur. The Navy and their contractor shall be notified of and invited to
weekly construction meetings that pertain to these plans and schedules. 
  

	 	11.	Monitoring and Sampling of Excavated Soil 

 The Project Developer shall remove soils
contaminated with lead from lead-based paint around the buildings that have been identified by NASA, prior to building demolition. NASA shall properly dispose of this soil at the Navy’s expense. The Project Developer or NASA, at the Project
Developer’s expense, shall monitor all excavated soil to determine if the soils contain volatile organic compounds (“VOCs”) or petroleum constituents. Vadose zone soils shall be stockpiled and managed separately from saturated zone
soils. The Project Developer shall remove and segregate concrete, asphalt, wood, piping and other demolition debris from soil and shall manage and dispose of demolition debris in accordance with all applicable regulations. The Project Developer
shall pay all costs related to demolition debris disposal. 

  
 7 

 The Project Developer or NASA, at the Project Developer’s expense, shall monitor and sample
soils generated from trenching and other excavation work throughout trenching and excavation activities. The soil being removed shall be visually observed for evidence of discoloration or staining. Soil exhibiting these characteristics shall be
analyzed using an organic vapor analyzer (“OVA”) or equivalent device before stockpiling. Excavated soil shall be field-screened using an OVA (or equivalent) to determine if the excavated soils are clean or may be chemically affected.
Field screening with an OVA (or equivalent) shall be performed at a rate of one soil sample for every 15 cubic yards of excavated soil. Excavated soils that show a continuous reading of five parts per million (“ppm”) or greater for at
least ten seconds using the OVA (or equivalent) shall be considered as possibly containing chemicals, and shall be segregated. The Project Developer shall transfer soil exhibiting these characteristics to a plastic-lined stockpile area in or
near the area of trenching or excavation. Soil samples shall be collected from random locations within the stockpile at a rate of two samples for every 50 cubic yards of stockpiled soil. Each of the two samples shall consist of at least five
composite samples representative of the stockpiled soil. The samples shall be submitted to a state-certified laboratory and analyzed using EPA Method 8260 (or its superceding EPA Method), including cis-1, 2-dichloroethene and Freon 113 and EPA
Method 8015 (or its superceding EPA Method) for high and low boiling point total petroleum hydrocarbons (“TPH”). After the soil has been verified to conform to the soil cleanup standards specified in the MEW ROD, and the Navy petroleum
site cleanup standards, the soils may be used for on-site cover or backfill. Clean soil that is tested using the field head space method with an OVA (or equivalent) that does not have a reading greater than five ppm for at least ten seconds also may
be used for on-site cover or backfill. Soil that does not qualify as clean soil shall be managed in accordance with Sections 13.2 through 13.6 of this Exhibit O. 

  
 8 

	 	11.1	Excavated Soil Classification and Monitoring Procedure 

 The Project Developer or
NASA shall monitor excavated soil with an OVA (or equivalent) to determine if the soils are clean or may contain chemicals, as defined below: 

Clean Soil: Soil that does not have a reading greater than five ppm continuously for ten seconds using the field head space method with
an OVA (or equivalent) specified below will be considered clean soil. 
 Soil Containing Chemicals: Soil that does not meet the
definition of clean soil will be considered soil containing chemicals. 
  

	 	11.2	Field Head Space Methods: 

 (a) A soil sample shall be taken from excavated soil in the
backhoe bucket at a point out of the excavation. 
 (b) The soil to be tested shall be placed into an unused re-sealable plastic bag or
clean mason jar container with a minimum volume of one quart or one liter, until the container is half full. 
 (c) The container shall be
sealed and left to sit under direct sunlight for approximately five minutes. 
 (d) The container shall be opened just enough to allow the
probe of the OVA (or equivalent) to be inserted into the container’s headspace. 
 (e) Any sample having a reading of five ppm or
greater continuously for at least ten seconds shall be considered soil containing chemicals. 
  

	 	12.	Notification of Saturated Soil Containing VOCs or TPH 

 If VOCs are determined to exist
in saturated zone soils in AR-1, the Project Developer shall immediately notify the MEW Companies’ representative. If VOCs are determined to exist in saturated zone soils in AR-2 or AR-6, NASA shall immediately notify the Navy. If TPH is
determined to exist in saturated zone soils in AR-1, AR-2, or AR-6, NASA shall immediately notify the Navy. 
  

	 	13.	Management and Disposition of Soils 

  

	 	13.1	Clean Soil 

 NASA shall be solely responsible for the determination as to whether
soil qualifies as clean soil either because it has been classified as clean soil in accordance with Section 11.1 of this Exhibit O or has been treated to the soil cleanup standards specified in the MEW ROD or the Navy petroleum site standards. Clean
soil that does not require treatment may be reused for cover or backfill or shall be transported to the open field 

  
 9 

 
north of Electrical Substation West (N225A) on Moffett, shown as Area A on the attached Figure 2, or to other areas on Moffett designated by NASA, and spread by the Project Developer at the
Project Developer’s cost. NASA agrees that Navy shall not be responsible for any determination made by NASA or the Project Developer that any soil qualifies as clean soil or that any soil may be used for any particular purpose at any particular
location on Moffett. 
  

	 	13.2	Vadose Zone Soils and Saturated Soils Containing TPH 

 Vadose zone and saturated
soils containing TPH (whether or not they also contain VOCs) shall be transported by the Project Developer to the bioremediation pad on the east side of Moffett, as shown on Figure 3, or to other areas on Moffett designated by NASA, and shall be
managed by NASA, at the Navy’s expense. 
  

	 	13.3	Saturated Zone Soils Containing Only VOCs 

 The Project Developer shall notify the
MEW Companies promptly if any saturated zone soil in AR-1 is determined by analytical testing to contain only those VOCs associated with the MEW plume at concentrations exceeding MEW ROD soil cleanup standards. The MEW Companies shall manage and
dispose of these soils as stated in the Agreement for Coordination of Construction and MEW Remedial System Modification Work (the “MEW Agreement”). 

NASA shall notify the Navy promptly if any saturated zone soil in AR-2 or AR-6 is determined by analytical testing to contain VOCs at
concentrations exceeding MEW ROD soil cleanup standards, or if any saturated zone soil in AR-I, AR-2, or AR-6 is determined by analytical testing to contain TPH above the Navy petroleum site cleanup standards. NASA shall manage and dispose, pursuant
to CERCLA Section 121 (d), these soils at the Navy’s cost. 
 NASA shall promptly make available to the Navy copies of analytical soil
data. Following review of the data, any soils that are found to be the responsibility of the Navy shall be delivered by the Project Developer to the bioremediation pad on the east side of Moffett, as shown on Figure 3, where it will be managed by
NASA at the Navy’s expense. Treatment or offsite disposal of the soil, pursuant to CERCLA Section 121 (d) shall be at the discretion and timing of NASA. If treated, the soils shall be treated to the

  
 10 

 
soil cleanup standards specified in the MEW ROD or Navy’s petroleum site cleanup standards. The Project Developer shall pay all costs of excavating and delivering the soil to the East Side
Bioremediation Pad. The Navy shall pay all costs of treating the soil and spreading the treated soil on-site or disposing of it offsite. If NASA elects to dispose of soil offsite pursuant to CERCLA Section 121 (d), NASA shall be designated the
generator and sign all necessary waste manifests. 
  

	 	13.4	Polyethylene Liners 

 The Project Developer shall provide plastic liners and
covers for the soil stockpiles located in the areas of trenching and excavation. The MEW Companies shall provide liners and covers for the soil at the MEW Soil Aeration Facility. NASA, at the Navy’s expense, shall provide plastic liners and
covers for the soil stockpiles at the East Side Bioremediation Pad. The location of the soil stockpiles in the areas of trenching and excavation shall be designated by NASA. 
  

	 	13.5	East Side Bioremediation Pad Sampling and Testing Procedures 

 Following aeration,
NASA shall collect two discrete soil samples for every 50 cubic yards of treated soil. Each of the two samples shall consist of at least five composite samples representative of the treated soil. The samples shall be analyzed using EPA Method 8260
and 8015 (or their superceding EPA Methods), including cis-1,2- dichloroethene and Freon. Sample collection and analytical costs shall be paid by the Navy. 
  

	 	13.6	On-Site Reuse 

 After soil treated by NASA has been determined to meet soil
cleanup standards, NASA shall move the clean soil onto an open field at the Navy’s expense. 
  

	 	14.	Management and Discharge of Groundwater Generated During Excavation and Dewatering Activities 

The Project Developer may be required to dewater pipeline trenches and other excavations and convey water away from
excavations. Groundwater in the area of Project Development may contain VOCs or TPH. The Project Developer shall manage, contain and discharge all water removed from excavation areas. The Project Developer shall transport the water to above
ground tanks, test the water by EPA Method 8260 and 

  
 11 

 
EPA Method 8015 (or their superceding EPA Methods) and discharge the water as follows: 
  

	 	14.1	Ground Water Containing TPH 

 If the groundwater contains TPH above 50 parts per
billion (“ppb”), as determined by EPA Method 8015 (or its superceding EPA Method), it shall not be discharged to the MEW GWTS. Depending on the chemical concentrations, the Project Developer may be able to obtain permission from the City
of Sunnyvale Waste Water Treatment Plant or the City of Palo Alto Waste Water Treatment Plant to discharge the water to the NASA sanitary sewer systems. Request for permission to discharge to sanitary sewer shall be coordinated with NASA. The water
shall be filtered before any discharge to the sewer system and the solids stored and subsequently managed by NASA at the Navy’s expense, as described above in Section 13. 

If the groundwater contains TPH above 50 ppb, the Project Developer shall deliver it to the WATS for treatment by the Navy. 

 

	 	14.2	Groundwater Containing VOCs 

 If the groundwater from AR-1 contains TPH below 50
ppb and contains VOCs that are identified as those associated with the MEW plume, the groundwater can be discharged to the MEW GWTS. The Project Developer shall follow the procedures described in the MEW Agreement. 

If the groundwater from AR-2 or AR-6 contains VOCs above the MEW ROD cleanup levels, the groundwater can be discharged to the WATS. The
Project Developer shall deliver the groundwater to clean Baker or similar tanks adjacent to WATS at the location shown as Area B -WATS Baker Tank Staging Area on Figure 4. The Project Developer shall inspect and sample the storage tanks before using
them to insure that they are clean. Sample results shall be provided to the Navy, and the Navy shall have an opportunity to inspect the tanks before their use. Treatment and discharge of groundwater through the WATS shall be performed by the Navy.
All groundwater shall be filtered before it is pumped into the clean storage tanks to minimize sediment buildup in the storage tanks. All solids removed from the groundwater and any filters shall be stored and subsequently characterized, managed and
disposed of in the same manner as 

  
 12 

 
contaminated soils as specified in Sections 11 through 13 of this Exhibit O. NASA shall be designated the generator and shall sign all necessary waste manifests for the solids and filter wastes.
The Project Developer shall pay all costs associated with extraction, delivery and storage of groundwater prior to treatment at the WATS. The Navy shall pay all costs of pumping the groundwater from the storage tanks and treating it through the
WATS. The Navy shall treat the stored water within a reasonable timeframe. 
  

	 	15.	Contractor Compliance With This Exhibit and the Agreement 

 NASA and the Navy each shall
provide a copy of the Agreement to their respective contractors and subcontractors and shall ensure that compliance with the Agreement is made a material part of their respective agreements with their contractors and subcontractors. CM SPE shall
provide a copy of this Exhibit O to its contractors and subcontractors and shall ensure that compliance with the Agreement is made a material part of its agreements with their contractors and subcontractors. 

  
 13 

 APPENDIX E 

Coordination of Construction 

and Navy Remedial System Modification 

Work NASA Research Park, Moffett 

Federal Airfield 

 AGREEMENT FOR COORDINATION OF CONSTRUCTION 

AND NAVY REMEDIAL SYSTEM MODIFICATION WORK AT 

NASA RESEARCH PARK, AMES RESEARCH CENTER, MOFFETT FIELD, 

CALIFORNIA 
 The National
Aeronautics and Space Administration (“NASA”) enters into this Agreement for Coordination of Construction and Navy Remedial System Modification Work at the proposed NASA Research Park (“NRP”), Ames Research Center, Moffett Field,
California (“Agreement”) with the United States Navy. NASA enters into this Agreement with the Navy pursuant to the authority of the National Aeronautics and Space Act of 1958, as amended, 42 U.S.C. §§ 2451 et seq. 

RECITALS 
 A. On June 9, 1989,
the United States Environmental Protection Agency (“EPA”) issued a Record of Decision (the “MEW ROD”) for the Middlefield-Ellis-Whisman area of Mountain View, California. The MEW ROD was
modified in September 1990 and April 1996 by EPA’s Explanations of Significant Differences. The MEW ROD requires the implementation of an EPA-approved regional groundwater remediation program (“RGRP”). 

B. In September, 1990, a Federal Facility Agreement (“FFA”) under CERCLA Section 120 was signed by the EPA, the Navy, and the State
of California, represented by the California Department of Health Services (“DHS”), and the California Regional Water Quality Control Board (“RWQCB”). The FFA states the Navy’s responsibilities for the investigation and
remediation of contaminated soil and groundwater within the proposed NRP area. 
 C. On December 22, 1992, the Navy and NASA signed a
Memorandum of Understanding (“MOU”) that stated the Navy would continue to be responsible for the investigation and remediation of its environmental contamination after the transfer of the former Naval Air Station Moffett Field to NASA. In
addition to the groundwater contamination, the MOU includes Navy responsibility for petroleum contamination in the soil and groundwater, and for lead in the soil caused by lead based paint on the buildings. 

  
 1 

 This MOU was further clarified by the Navy in a letter signed on October 4, 1993, which stated
that “The Navy’s obligations under the MOU shall include taking possession of, and properly managing any contaminated soil or groundwater that has been left in place in accordance with a CERCLA, RCRA, or other cleanup remedy but
subsequently upon its excavation, disturbance, or discharge by NASA during development for reuse of Moffett Field becomes hazardous waste, o requires treatment prior to discharge.” 

D. On December 17, 1993, EPA signed the Moffett Field FFA amendment, which had already been signed by the Navy, the California Department of
Toxic Substance Control (“DTSC”) and the RWQCB. In this FFA amendment, the Navy adopted the MEW ROD for the remediation of soil and groundwater contaminated with chlorinated solvents within the proposed NRP area. 

E. By 1998, the Navy, NASA, and the MEW Companies had agreed in principle to an allocation and settlement of each party’s
responsibilities for the RGRP. NASA and the MEW Companies signed this Allocation and Settlement Agreement on March 16, 1998. 
 F. As part
of the RGRP, the MEW Companies have installed, operate, monitor and maintain a groundwater monitoring and remedial system on Moffett Field (“Moffett”) under the direction of EPA. These components include, but are not limited to,
groundwater monitoring wells, groundwater extraction wells, single and double-contained pipelines, air relief structures, electrical power and instrumentation conduits, fiber-optic instrument systems,
electrical field control panels, leak detection systems, radio frequency communication links, settlement pin monuments and a groundwater treatment system (“GWTS”). The MEW Companies are required by EPA to operate the GWTS and related
extraction wells and components continuously except during maintenance. Approval for any shutdown of more than 24 hours duration must be obtained from the EPA Remedial Project Manager (“RPM”) in advance. 

G. Pursuant to its FFA, the Navy has installed, operates, monitors and maintains a groundwater monitoring and remedial system, the Westside
Aquifer Treatment System (“WATS”) on Moffett under the direction of EPA and the RWQCB. The WATS’ components include, but are not limited to, groundwater monitoring wells, 

  
 2 

 
groundwater extraction wells, pipelines, air relief structures, electrical power and instrumentation conduits, fiber-optic instrument systems, electrical field control panels, leak detection
systems, settlement pin monuments and a groundwater treatment system. The Navy is required by EPA to operate the WATS and related extraction wells and components continuously except during maintenance. Approval for any shutdown of more than 24 hours
duration must be obtained from the EPA RPM in advance. 
 H. The Navy is also responsible for investigation and remediation of petroleum
sites at Moffett, with oversight by the RWQCB. The Navy had installed a treatment system at Site 14 South to address petroleum contamination. The Navy had also installed an Iron Curtain demonstration project west of Hangar 1. 

I. NASA plans to sign agreements with “Project Developers” to undertake redevelopment activities at Moffett in connection with the
Project Developers’ leases of certain improvements at Moffett. These activities include, but are not limited to, demolition, grading, trenching and other excavation work, and construction connected with the development of office, educational,
and research and development facilities (collectively, “Project Development”). 
 J. NASA and the Navy enter into this Agreement
to minimize any impact of Project Development on the operation, monitoring, maintenance and modification of the WATS and to allow Navy access to the WATS during and after Project Development; and to clarify the roles and responsibilities for
managing contaminated soil and groundwater that is excavated during the Project Development. NASA and the Navy recognize that, to coordinate Project Development and the continued operation of the WATS effectively, it will be necessary for NASA and
the Navy to be in regular, frequent communication. 
 NOW, THEREFORE, NASA and the Navy agree as follows: 

AGREEMENT 
  

	 	1.	Geographic Scope of Agreement 

 This Agreement applies only within those geographical
parts of Moffett designated as AR-I, AR-2, and AR-6 on the attached Figure 1. 

  
 3 

	 	2.	Scheduling of Work 

 NASA shall meet with the Navy as early as possible during Project
Development planning to coordinate Project Development with the operation, monitoring, maintenance and modification of the WATS and any petroleum site or other remedial work (collectively, the “Remedial System”). Detailed drawings showing
the locations of the WATS and any other treatment system components shall be provided by the Navy to NASA in CAD form so they can be integrated into the Project Developer’s plans. 

 

	 	3.	Remedial System Protection and Modification; Exacerbation of Contamination 

 The Project
Developer shall protect the integrity of all components of the Remedial System during Project Development and shall take all reasonable measures to minimize Remedial System downtime. The Project Developer shall pay any costs of relocation,
replacement, alteration, protection, modification, or repair of the Remedial System caused by Project Development. In addition, if the Project Developer damages any Remedial System component in a manner that causes a release of untreated groundwater
or soil or if the Project Developer exacerbates existing soil or groundwater contamination, the Project Developer shall pay all costs of investigation, remediation, EPA oversight, and any penalties associated with such release or exacerbation. The
design and construction of any modification to the Remedial System shall be performed by the Navy contractors, under separate contract to the Project Developer; all modification costs, including EPA oversight costs, shall be paid by the Project
Developer. 
  

	 	4.	Well Protection 

 The Project Developer shall repair any damage to Remedial System wells
caused by Project Development. Prior to the initial Project Development demolition or construction fieldwork, the Navy shall field locate all Remedial System wells. Prior to the start of Project Development fieldwork, the Project Developer shall
install brightly painted steel pipes over each Remedial System monitoring and extraction well designated by the Navy. The painted pipe shall extend above ground not less than four feet, so as to be highly visible, and shall be buried sufficiently
below the ground surface to protect the wellhead. Alternative equivalent well protection measures may be used by the Project Developer provided the Navy approves any alternative protective measure in writing prior to its use. 

  
 4 

 Additionally, all Project Development work within two feet of Remedial System wells shall be
performed manually with hand tools. Fine grading work performed in areas more than two feet from the Remedial System wells but within close proximity shall be performed by light grading equipment. 

 

	 	5.	Well Sealing and Well Replacement 

 If the Project Developer determines that a Remedial
System well conflicts with the planned Project Development and must be removed, the Project Developer shall pay all costs of well sealing and replacement and all related Navy costs, including but not limited to the cost of installing replacement
conduit, piping, boxes, controls and all other components needed to return a well to service, developing the well, conducting a baseline first round of groundwater sampling, and preparing all required plans, surveys and reports. The Project
Developer shall be responsible for sealing all wells located within 15 feet of the outer wall of a new building. No well shall be sealed or relocated without the prior written approval of the EPA and RWQCB RPMs. Well sealing and installation
shall comply with Santa Clara Valley Water District (“SCVWD”) guidance and take place under SCVWD permit. Coordination with EPA and the RWQCB, and well sealing and replacement, shall be performed by the Navy’s contractor, under
separate contract with the Project Developer, at the Project Developer’s sole cost. 
  

	 	6.	Remedial System Pipeline Protection and Replacement 

 Prior to initial Project
Development field work, the Project Developer shall provide and place steel plate or equivalent protective measures over the existing Navy pipelines and power and control conduits. If the Project Developer determines that a pipeline, or other
treatment system component, conflicts with the planned Project Development and must be removed and relocated, the Project Developer shall pay all costs related to pipeline, and other treatment system component, removal and replacement, including but
not limited to design, permitting, review, inspection, construction and independent quality assurance inspection costs. The Project Developer shall be responsible for removing and relocating all pipelines and other components

  
 5 

 
located within five feet of the outer edge of the footing or foundation of a new building. No pipeline or other component shall be relocated without the prior approval of the EPA and RWQCB RPMs.
Replacement pipeline installation procedures shall also be approved by the EPA and RWQCB RPMs. Coordination to obtain the approval of EPA and the RWQCB, and pipeline removal and replacement work, shall be performed by the Navy’s
contractor, under separate contract to the Project Developer, at the Project Developer’s cost. 
  

	 	7.	Notification of Shutdown of Groundwater Extraction Wells or GWTS 

 If it appears
necessary to shut down a Remedial System extraction well or the WATS during Project Development, NASA shall give written notice to the Navy five working days in advance of the proposed shutdown. In the event of an inadvertent shutdown of any
component of the Remedial System, the Project Developer shall give immediate verbal notice to the Navy. Additionally, NASA shall provide to the Navy a written explanation of the reason for and the duration of any inadvertent shutdown within 48 hours
of the shutdown. 
  

	 	8.	Access to Wells and the GWTS 

 Project Development shall be performed in such a way that
all Remedial System wells, pull boxes and the WATS and associated components remain accessible to the EPA, RWQCB, and the Navy and their equipment for sampling, operation, maintenance, removal and replacement of pumps, and well sealing to the
maximum extent practicable during and after Project Development. If it becomes necessary to restrict access to a well or other Remedial System component during Project Development, NASA shall provide written notice to the Navy five working days in
advance of creating the restriction, with an explanation of the reason for and the expected duration of the proposed restricted access. Prior to the initial Project Development fieldwork, the Navy shall provide NASA with the schedule for well
sampling. 
  

	 	9.	Modifications to Well Vaults and Wellheads 

 Following completion of final grade by the
Project Developer, the Navy’s contractor, under separate contract to the Project Developer, shall modify the Navy wells, well vaults, and pull boxes as needed based on the final grade established by the Project Developer. All costs associated
with these modifications shall be paid by the Project Developer. 

  
 6 

	 	10.	Communications 

 The Project Developer, all of its contractors, the Navy, all of their
contractors, and NASA shall each designate in writing a primary and alternate contact person, including all applicable mailing addresses, telephone numbers, email addresses and facsimile numbers. The Navy shall have sole authority and responsibility
for all communications with EPA and RWQCB regarding the Remedial System, including its operating status, any Project Development-related shutdowns and any modifications. NASA shall provide the Navy with all demolition, grading and construction work
schedules, a full set of civil, landscaping, foundation and utility plans and specifications, and updates to these plans and specifications and schedules promptly as they occur. The Navy and their contractor shall be notified of and invited to
weekly construction meetings that pertain to these plans and schedules. 
  

	 	11.	Monitoring and Sampling of Excavated Soil 

 The Project Developer shall remove soils
contaminated with lead from lead-based paint around the buildings that have been identified by NASA, prior to building demolition. NASA shall properly dispose of this soil at the Navy’s expense. The Project Developer or NASA, at
the Project Developer’s expense, shall monitor all excavated soil to determine if the soils contain volatile organic compounds (“VOCs”) or petroleum constituents. Vadose zone soils shall be stockpiled and managed separately from
saturated zone soils. The Project Developer shall remove and segregate concrete, asphalt, wood, piping and other demolition debris from soil and shall manage and dispose of demolition debris in accordance with all applicable regulations. The Project
Developer shall pay all costs related to demolition debris disposal. 
 The Project Developer or NASA, at the Project Developer’s
expense, shall monitor and sample soils generated from trenching and other excavation work throughout trenching and excavation activities. The soil being removed shall be visually observed for evidence of discoloration or staining. Soil
exhibiting these characteristics shall be analyzed using an organic vapor analyzer (“OVA”) or equivalent device before 

  
 7 

 
stockpiling. Excavated soil shall be field-screened using an OVA (or equivalent) to determine if the excavated soils are clean or may be chemically affected. Field screening with an OVA (or
equivalent) shall be performed at a rate of one soil sample for every 15 cubic yards of excavated soil. Excavated soils that show a continuous reading of five parts per million (“ppm”) or greater for at least ten seconds using the OVA (or
equivalent) shall be considered as possibly containing chemicals, and shall be segregated. The Project Developer shall transfer soil exhibiting these characteristics to a plastic-lined stockpile area in or near the area of trenching or excavation.
Soil samples shall be collected from random locations within the stockpile at a rate of two samples for every 50 cubic yards of stockpiled soil. Each of the two samples shall consist of at least five composite samples representative of the
stockpiled soil. The samples shall be submitted to a state-certified laboratory and analyzed using EPA Method 8260 (or its superceding EPA Method), including cis-1, 2-dichloroethene and Freon 113 and EPA Method 8015 (or its superceding EPA Method)
for high and low boiling point total petroleum hydrocarbons (“TPH”). After the soil has been verified to conform to the soil cleanup standards specified in the MEW ROD, and the Navy petroleum site cleanup standards, the soils may be used
for on-site cover or backfill. Clean soil that is tested using the field head space method with an OVA (or equivalent) that does not have a reading greater than five ppm for at least ten seconds also may be used for on-site cover or backfill. Soil
that does not qualify as clean soil shall be managed in accordance with Sections 13.2 through 13.6 of this Agreement. 
  

	 	11.1	Excavated Soil Classification and Monitoring Procedure 

 The Project Developer or
NASA shall monitor excavated soil with an OVA (or equivalent) to determine if the soils are clean or may contain chemicals, as defined below: 

Clean Soil: Soil that does not have a reading greater than five ppm continuously for ten seconds using the field head space method with
an OVA (or equivalent) specified below will be considered clean soil. 
 Soil Containing Chemicals: Soil that does not meet the
definition of clean soil will be considered soil containing chemicals. 

  
 8 

	 	11.2	Field Head Space Methods: 

 (a) A soil sample shall be taken from excavated soil
in the backhoe bucket at a point out of the excavation. 
 (b) The soil to be tested shall be placed into an unused re-sealable plastic bag
or clean mason jar container with a minimum volume of one quart or one liter, until the container is half full. 
 (c) The container shall
be sealed and left to sit under direct sunlight for approximately five minutes. 
 (d) The container shall be opened just enough to allow
the probe of the OVA (or equivalent) to be inserted into the container’s headspace. 
 (e) Any sample having a reading of five ppm or
greater continuously for at least ten seconds shall be considered soil containing chemicals. 
  

	 	12.	Notification of Saturated Soil Containing VOCs or TPH 

 If VOCs are determined to exist
in saturated zone soils in AR-1, the Project Developer shall immediately notify the MEW Companies’ representative. If VOCs are determined to exist in saturated zone soils in AR-2 or AR-6, NASA shall immediately notify the Navy. If TPH is
determined to exist in saturated zone soils in AR-1, AR-2, or AR-6, NASA shall immediately notify the Navy. 
  

	 	13.	Management and Disposition of Soils 

  

	 	13.1	Clean Soil 

 NASA shall be solely responsible for the determination as to whether
soil qualifies as clean soil either because it has been classified as clean soil in accordance with Section 11.1 of this Agreement or has been treated to the soil cleanup standards specified in the MEW ROD or the Navy petroleum site standards.
Clean soil that does not require treatment may be reused for cover or backfill or shall be transported to the open field north of Electrical Substation West (N225A) on Moffett, shown as Area A on the attached Figure 2, or to other areas on
Moffett designated by NASA, and spread by the Project Developer at the Project Developer’s cost. NASA agrees that Navy shall not be responsible for any determination made by NASA or the Project Developer that any soil qualifies as clean soil or
that any soil may be used for any particular purpose at any particular location on Moffett. 

  
 9 

	 	13.2	Vadose Zone Soils and Saturated Soils Containing TPH 

 Vadose zone and saturated
soils containing TPH (whether or not they also contain VOCs) shall be transported by the Project Developer to the bioremediation pad on the east side of Moffett, as shown on Figure 3, or to other areas on Moffett designated by NASA, and shall be
managed by NASA, at the Navy’s expense. 
  

	 	13.3	Saturated Zone Soils Containing Only VOCs 

 The Project Developer shall notify the
MEW Companies promptly if any saturated zone soil in AR-1 is determined by analytical testing to contain only those VOCs associated with the MEW plume at concentrations exceeding MEW ROD soil cleanup standards. The MEW Companies shall manage and
dispose of these soils as stated in the Agreement for Coordination of Construction and MEW Remedial System Modification Work (the “MEW Agreement”). 

NASA shall notify the Navy promptly if any saturated zone soil in AR-2 or AR-6 is determined by analytical testing to contain VOCs at
concentrations exceeding MEW ROD soil cleanup standards, or if any saturated zone soil in AR-1, AR-2, or AR-6 is determined by analytical testing to contain TPH above the Navy petroleum site cleanup standards. NASA shall manage and dispose, pursuant
to CERCLA Section 121 (d), these soils at the Navy’s cost. 
 NASA shall promptly make available to the Navy copies of analytical soil
data. Following review of the data, any soils that are found to be the responsibility of the Navy shall be delivered by the Project Developer to the bioremediation pad on the east side of Moffett, as shown on Figure 3, where it will be managed by
NASA at the Navy’s expense. Treatment or offsite disposal of the soil, pursuant to CERCLA Section 121 (d) shall be at the discretion and timing of NASA. If treated, the soils shall be treated to the soil cleanup standards specified in the MEW
ROD or Navy’s petroleum site cleanup standards. The Project Developer shall pay all costs of excavating and delivering the soil to the East Side Bioremediation Pad. The Navy shall pay all costs of treating the soil and spreading the treated
soil on-site or disposing of it offsite. If NASA elects to dispose of soil offsite pursuant to CERCLA Section 121 (d), NASA shall be designated the generator and sign all necessary waste manifests. 

  
 10 

	 	13.4	Polyethylene Liners 

 The Project Developer shall provide plastic liners and
covers for the soil stockpiles located in the areas of trenching and excavation. The MEW Companies shall provide liners and covers for the soil at the MEW Soil Aeration Facility. NASA, at the Navy’s expense, shall provide plastic liners and
covers for the soil stockpiles at the East Side Bioremediation Pad. The location of the soil stockpiles in the areas of trenching and excavation shall be designated by NASA. 
  

	 	13.5	East Side Bioremediation Pad Sampling and Testing Procedures 

 Following aeration,
NASA shall collect two discrete soil samples for every 50 cubic yards of treated soil. Each of the two samples shall consist of at least five composite samples representative of the treated soil. The samples shall be analyzed using EPA Method 8260
and 8015 (or their superceding EPA Methods), including cis-1,2- dichloroethene and Freon. Sample collection and analytical costs shall be paid by the Navy. 
  

	 	13.6	On-Site Reuse 

 After soil treated by NASA has been determined to meet soil
cleanup standards, NASA shall move the clean soil onto an open field at the Na’s expense. 
  

	 	14.	Management and Discharge of Groundwater Generated During Excavation and Dewatering Activities 

The Project Developer may be required to dewater pipeline trenches and other excavations and convey water away from excavations. Groundwater in
the area of Project Development may contain VOCs or TPH. The Project Developer shall manage, contain and discharge all water removed from excavation areas. The Project Developer shall transport the water to above ground tanks, test the water by
EPA Method 8260 and 

  
 11 

 
EPA Method 8015 (or their superceding EPA Methods) and discharge the water as follows: 
  

	 	14.1	Ground Water Containing TPH 

 If the groundwater contains TPH above 50 parts per
billion (“ppb”), as determined by EPA Method 8015 (or its superceding EPA Method), it shall not be discharged to the MEW GWTS. Depending on the chemical concentrations, the Project Developer may be able to obtain permission from the City
of Sunnyvale Waste Water Treatment Plant or the City of Palo Alto Waste Water Treatment Plant to discharge the water to the NASA sanitary sewer systems. Request for permission to discharge to sanitary sewer shall be coordinated with NASA. The water
shall be filtered before any discharge to the sewer system and the solids stored and subsequently managed by NASA at the Navy’s expense, as described above in Section 13. 

If the groundwater contains TPH above 50 ppb, the Project Developer shall deliver it to the WATS for treatment by the Navy. 

 

	 	14.2	Groundwater Containing VOCs 

 If the groundwater from AR-1 contains TPH below 50
ppb and contains VOCs that are identified as those associated with the MEW plume, the groundwater can be discharged to the MEW GWTS. The Project Developer shall follow the procedures described in the MEW Agreement. 

If the groundwater from AR-2 or AR-6 contains VOCs above the MEW ROD cleanup levels, the groundwater can be discharged to the WATS. The
Project Developer shall deliver the groundwater to clean Baker or similar tanks adjacent to WATS at the location shown as Area B -WATS Baker Tank Staging Area on Figure 4. The Project Developer shall inspect and sample the storage tanks before using
them to insure that they are clean. Sample results shall be provided to the Navy, and the Navy shall have an opportunity to inspect the tanks before their use. Treatment and discharge of groundwater through the WATS shall be performed by the Navy.
All groundwater shall be filtered before it is pumped into the clean storage tanks to minimize sediment buildup in the storage tanks. All solids removed from the groundwater and any filters shall be stored and subsequently characterized,
managed and disposed of in the same manner as contaminated soils as specified in Sections 11 through 13 of this Agreement. NASA shall be designated the generator and shall sign all necessary waste manifests for the solids and filter wastes. The
Project Developer shall pay all costs associated with extraction, 

  
 12 

 
delivery and storage of groundwater prior to treatment at the WATS. The Navy shall pay all costs of pumping the groundwater from the storage tanks and treating it through the WATS. The Navy shall
treat the stored water within a reasonable timeframe. 
  

	 	15.	Contractor Compliance With This Agreement 

 NASA, the Navy, and the Project Developer
each shall provide a copy of this Agreement to their respective contractors and shall ensure that compliance with this Agreement is made a material part of their respective agreements with their contractors. 

 

	 	16.	Notices 

 All written notices required by this Agreement shall be deemed effective (1)
when delivered, if personally delivered to the person being served or (2) three business days after deposit in the mail if mailed by United States mail, postage paid certified, return receipt requested: 

If To: “Navy” 

Lawrence Lansdale 
 Navy SouthWest
Div 
 Address 
 San Diego, CA
zip 
 If To: ‘‘NASA” 

Don Chuck 
 NASA Ames Research
Center 
 MS 218-1 
 Moffett
Field, CA 94035 

  
 13 

	 	17.	Effective Date 

 This Agreement shall take effect upon the date of the last signature
appearing below. 
 IN WITNESS THEROF, the following parties have entered into this Agreement. 

 

									
	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION	 	
					
	By:	 	  
	 		 	Dated:	 	  

	Title:	 	  
	 		 		 	
				
	U.S. Navy	 		 		 	
					
	By:	 	  
	 		 	Dated:	 	  

	Title:	 	  
	 		 		 	

  
 14 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 January 28, 2003 
 56910 002

 Mr. Thomas Anderson 
 PAI/ISSi 

NASA Ames Research Center, MS 19-21 
 Moffett Field,
California 94035-1000 
 Lead Impacted Soil Sampling and 

Removal Action Workplan Implementation Initial Soil Sample Results 

NASA Research Park Moffett Field, California 
 Dear Mr.
Anderson: 
 This report presents the results of soil sampling performed by MACTEC Engineering and Consulting, Inc. (MACTEC; formerly known as Harding ESE,
Inc.) for PAI/ISSi at the National Aeronautics and Space Administrations (NASA) Research Park (NRP), Moffett Field, California. The intent of this investigation was to assess the levels oflead in soil from lead-based paint (LBP) at the
NASA NRP, Moffett Field, California (Site; Plate 1). MACTEC conducted this assessment and prepared this report under contract to PAI/ISSi on behalf of the NASA Ames Research Center. 

Background 
 In July 2002, Harding ESE, prepared Lead
Impacted Soil Summary Report and Sampling and Removal Action Workplan, NASA Research Park, Moffett Field, California (Harding ESE, 2002) to summarize previous LBP in soil data collected by others at the NRP. That document also presented the
following: 
  

	•	 	A description of additional soil sampling activities (Initial Soil Lead Assessments) for those buildings where the presence of LBP in the building materials is suspected or confirmed 

 

	•	 	An outline of removal action activities for areas where previous data has confirmed the presence of LBP in soil 

  

	•	 	The process and protocols to be utilized for the Initial Soil Lead Assessment. 

 The objective of the Workplan
was to identify and develop removal procedures for soil that contains lead exceeding the San Francisco Regional Water Quality Control Board (SFRWQCB) risk-based screening level (RBSL) and to confirm that this cleanup level is not exceeded after soil
removal activities. Based on a residential land use scenario, the RBSL for lead in surface soils (<3 meters (m) in depth) used for NRP is 200 milligrams per kilogram (mg/kg). 

  
 MACTEC Engineering and
Consulting, Inc. 
 90 Digital Drive 

Novato, CA 94949 
 415-883-0112
• Fax: 415-884-3300 

 January 28, 2003 

56910 002 
 Mr. Thomas Anderson 

PAI/ISSi 
 Page 2 

 

 On the basis of the review of previous data, MACTEC identified multiple buildings/areas where lead-impacted soils were identified or suspected. On October 24, 2001, Harding ESE conducted a site visit to inspect these buildings/areas and to identify those that were surrounded by soil. Buildings/areas
surrounded by paved surfaces were not included for soil lead assessments. The areas identified for initial soil lead assessments are the pre-1978 buildings with the potential for lead based paint (Harding ESE, 2002). The sampling locations
are shown on Plates 2 through 12. In addition, a building/area’s previous use was also considered. For example, Building 38 (Area 2, Parcel 1) is and has historically been tennis courts. Therefore, LBP impacts were not suspected and
sampling was not recommended. 
 Field Investigation 

MACTEC collected samples from the Site on September 17 and 18, 2002, in accordance with protocols outlined in the workplan. The samples were
collected using a stainless steel trowel and immediately transferred to clean four-ounce glass jars. The soil assessment included collecting a suite of composite samples in unpaved areas at the building comers, near suspect discharge points
such as downspouts, and at regular intervals around the periphery of the building. The sampling grid consisted of six samples collected from cells up to 30-feet long by 20-feet wide. Samples were collected from 0 to 6 inches below the
surface at the dripline or no more than 2-feet from the building wall if the dripline was not apparent. 
 Six samples per cell were collected and the
samples from each cell were thoroughly mixed and composited in accordance with ASTM Standard D-6051-96 (ASTM, 1996). The samples were labeled and transported under chain of custody procedures to a state-certified analytical laboratory
for total lead analysis by EPA Test Method 6010. Samples with total lead concentrations greater than 50 mg/kg were also analyzed for teachable lead using the Waste Extraction Test (WET) method in accordance with the Workplan. 

Upon inspection of the site and discussion with Mr. Tom Anderson of PAl/ISSi, ten building locations were established and sampled. Several sites were
eliminated from the original sampling program due to the soil bed being a veneer of soil over an asphaltic concrete (AC) pavement. One building was a transite roofed open structure on steel poles above a recreational barbecue area. Two
additional building locations, Area 10 buildings 512C and 547B were added by request. Sampling locations are shown on Plates 2 (overview) through 12 and are summarized as follows: 

 

			
	 Area 2
	  	
	 Building 24
	  	 6 samples

		
	 Area 3
	  	
	 Building 943
	  	 6 samples

 January 28, 2003 

56910 002 
 Mr. Thomas Anderson 

PAI/ISSi 
 Page 3 

 

			
	Area 4	  	
	Building 510	  	6 samples
		
	Area s	  	
	Building 29	  	2 samples (discrete sample and duplicate collected at east side downspout)
		
	Are 6b	  	
	Building 3	  	72 sample
		
	Area 7	  	
	Building 533	  	6 samples
		
	Area 9	  	
	Building 113	  	6 samples (one exposed soil location only)
		
	Area 10	  	
	Building 512C	  	24 samples Area IO
	Building 547B	  	6 samples
		
	Area 11	  	
	Building 329	  	6 samples (samples collected from voids in the AC surfacing where accessible)

 Field Investigation 

Analytical Results 
 Table 1 summarizes the total lead
results of the soil composites and the corresponding teachable lead results for samples yielding results greater than or equal to 50 mg/kg total lead. The analytical reports and chain of custody documentation are presented in Appendix A. 

MACTEC’s evaluation of the analytical data is summarized as follows: 
  

	•	 	With the exception of the sample collected from Building 113, Area 9, all total lead results were below the 200 mg/kg RBSL. Lead was detected at a concentration of 990 mg/kg in the sample collected from
Building 113. Lead was detected in the remainder of the samples at concentrations between 14 and 170 mg/kg. 

  

	•	 	Samples from 22 locations (Building 3 [11 locations and one duplicate sample], Building 24 [original and duplicate samples], Building 29 [original and duplicate samples], Building 113, Building 329, Building 510,
Building 512C, Building 533, and Building 943) exceeded 50 mg/kg and were analyzed for teachable lead using the WET method. 

  

	•	 	The teachable lead results for samples from Building 3 (East side of building, north end 1”1 inset), Building 29 (original and duplicate samples), Building 113 and Building. 510) were at or above the STLC threshold
of 5.0 milligrams per liter (mg/L) as cited in Title 22, California Code of Regulations. It should be noted that the sample location at Building 29 represents materials washed into the gutters and deposited on the AC surfacing materials
surrounding the building and do not necessarily indicate soil concentrations below the AC cover. 

 January 28, 2003 

56910 002 
 Mr. Thomas Anderson 

PAI/ISSi 
 Page 4 

 

 Summary 

Based on the results of the sampling, soil from the vicinity of Building 113, exceeds the NASA RBSL of 200 mg/kg. Prior to building demolition, soil
in the vicinity of this building will require removal and disposal as Class I hazardous waste because the teachable lead concentration exceeded the STLC. Confirmation sampling of soil below the excavated area will need to be performed in
accordance with procedures outlined in the Workplan developed for the NRP. All other sample results were below the NASA RBSL and soil at these building locations does not require additional investigation or removal. 

Based on the results of the leachable lead analysis, soil in the vicinity of Buildings 3 (East side of building, north end 111 inset), 29, 113 and 510 has
leachable lead concentrations that exceed the STLC threshold of 5.0 mg/L. Because the soil did not exceed the RBSL, it is acceptable for the soil to be left in place. However, if the soil is to be excavated and moved elsewhere, then the
soil must be disposed of as a Class I waste because the leachable lead concentrations exceeded the STLC threshold. 
 Due to the limited nature of the
sampling program, it is possible that concealed materials above the RBSL or hazardous waste levels may be present or encountered during excavation or other intrusive activities. Ifother hazardous materials are discovered during excavation or
construction activity, work should cease and NASA soil screening policy and procedures should be implemented to determine the nature and extent of the encountered hazard. 

If you have questions or would like additional information, please contact Gary Lieberman at (415) 884-3158 

 

	
	 Very truly yours,

	
	 MACTEC Engineering and Consulting, Inc.

	
	 Matthew H. Walraven, CSST 96-2072

	 Staff Environmental Scientist

	 MHWalraven@mactec.com

 January 28, 2003 

56910 002 
 Mr. Thomas Anderson 

PAI/ISSi 
 Page 5 

 

 Gary A. Lieberman 

Senior Geologist 
 GALieberman@mactec.com 

MW/Gl./kb/KBS9306.DOC-NASA 
  

			
	 Attachments:
	 	 Plate 1. Site Vicinity Map

		 	 Plate 2. Base Map, Soil/Lead Sampling Plates 3-12. Sampling Locations

		 	 Table 1. Summary of Soil Analytical Results

		 	 Appendix. A. Laboratory Analytical Results and Chain of Custody Forms

 References 
 American
Society for Testing and Materials (ASTM), 1996. Guide D6051-96(2001) Standard Guide for Composite Sampling and Field Subsampling for Environmental Waste Management Activities. 

MACTEC Engineering and Environmental Services, Inc. (MACTEC) 2002. Lead Impacted Soil Summary Report and Sampling and Removal Action Workplan, NASA
Research Park, Moffett Field, California. July 24. 

 January 28, 2003 

56910 002 
 Mr. Thomas Anderson 

PAI/ISSi 
 Page 6 

 

 Distribution 

 

 Ms. Sandy Olliges 

MS 218-1 
 NASA Ames Research Center 

Moffett Field, California 94035 
 Thomas Anderson 

MS 19-21 
 NASA Ames Research Center 

Moffett Field, California 94035 
 Ms. Alana Lee SFD7-4 

Environmental Protection Agency 
 75 Hawthorne Street 

San Francisco, California 94105 
 Ms. Carmen White SFD8-l 

Environmental Protection Agency 
 75 Hawthorne Street 

San Francisco, California 94105 
 Ms.
Adriana·Constantinescu 
 California Regional Water Quality Control Board 

1515 Clay Street 
 Oakland, California 94612 

Mr. Lawrence Lansdale 
 BRAC- Environmental Coordinator 

BRAC Operations, Code 06CM.MP 
 1230 Columbia Street, Suite 100

 San Diego, California 92101 
 Mr. Jim Boarer 

Locus Technologies 
 299 Fairchild Drive 

Mountain View, California 94043 
 Mr. Tom Kalinowski 

EKI 
 1870 Ogden Drive 

Burlingame, California 94919-5306

 Mr. Jeff Kellam ATSDR 

MS E-56 
 1600 Clifton Road 

Atlanta, Georgia 30333 
 RAB- Community Co-Chair Mr. Bob Moss 

PBAF-410 
 4010 Orme Street 

Palo Alto, California 94306 
 RAB- Committee 

Mr. Jim McClure 
 4957 Northdale Drive 

Fremont, California 94536 
 Trish Morrissey 

NASA Ames Research Center 
 MS 204-2 

Moffett Field, CA 94035 
 Mr. George Sloup 

NASA Ames Research Center MS 202 A-4 
 Moffett Field, CA 94035

 Mejghan Haider 
 NASA Ames Research Center 

MS 204-2 
 Moffett Field, CA 94035 

NASA PARTNERS 
 Mr. Dan Blunk 

UCSC 
 Environmental 

1156 High St. 
 Santa Cruz, California 95064

 

 January 28, 2003 

56910 002 
 Mr. Thomas Anderson 

PAI/ISSi 
 Page 7 

 

 Kevin Lamb 
 Office
of Planning Services 
 Carnegie Mellon University 
 5000 Forbes
Ave. 
 Pittsburgh, Pennsylvania 15213 
 Karen Matthews 

Computer History Museum 
 P.O. Box 367 

Moffett Field, California 94035 
 Daphne C. Tirado 

1721O Torry Ct. 
 Morgan Hill, California 95037 

Nancy Bussani 
 San Jose State University 

1 Washington Sq. 
 San Jose California 95192-0025 

Lisa Alceson 
 Kerr Hall- 3rd Floor 

UCSC 
 1156 High St. 

Santa Cruz, California 95064 
 Jonathan Wyke 

Lockheed 
 20 E. Clementon Rd. 

Suite 102 South 
 Gibbsborow, New Jersey 08026 

Rick Leas (650) 254-2250 
 Golden Bay Federal Credit Union 

556 Edquiba Road 
 Moffett Field, CA 94035 

Mike Finn 
 Ion America I Girvan Institute 

NASA Ames Research Center 
 Building 543 

Moffett Field, Ca. 94035

 Space Technology Center 

Dave Englebert 
 19327 Northampton Dr. 

Saratoga, California 95070 
 Lt. Col. Alexander, CANG 

California Air National Guard 
 129th Air Rescue 

P.O. Box 103- Stop 17 
 Moffett Federal Airfield 

Moffett Field, California 94035 
 Col. Manto, Army Reserve 

P.O. Box 96 
 Moffett Federal Airfield 

Moffett Field, California 94035 
 Maureen Talbott, NEX 

Building 476 Navy Exchange #110- 340 
 Moffett Federal Airfield

 Moffett Field, California 94035 
 William Penny, Commissary,

 P.O. Box 387 
 Moffett Field, California 94035 

Building 12 
 DECA 

Ken Baker, US Post Office 
 1070 La Avienda Ave. 

Mountain View, California 94043 
 City of Mountain View Public
Library 
 585 Franklin St. 
 Mountain View, Ca. 94041-1988 

City of Sunnyvale 
 Reference Desk 

665 W. Olive Ave. 
 Sunnyvale, Ca. 94086-7655

 

 PLATES 

 

 
 [Plate 1] 

 

 
 [Plate 2] 

  
 2 

 

 
 [Plate 3] 

  
 3 

 

 
 [Plate 4] 

  
 4 

 

 
 [Plate 5] 

  
 5 

 

 
 [Plate 6] 

  
 6 

 

 
 [Plate 7] 

  
 7 

 

 
 [Plate 8] 

  
 8 

 

 
 [Plate 9] 

  
 9 

 

 
 [Plate 10] 

  
 10 

 

 
 [Plate 11] 

  
 11 

 TABLES 

 

 

 

 

 

 

 

 

 APPENDICES 

 

 
 4 October, 2002 
 Gary
Lieberman Harding ESE 
 90 Digital Drive 
 Novato, CA 94949

 RE: General Commercial 
 Sequoia Work Order: P209467 

Enclosed are the results of analyses for samples received by the laboratory on 09/19/02 13:00. If you have any questions concerning this report, please feel
free to contact me. 
 Sincerely, 
 Michelle M. Wiita 

Project Manager 
 CA ELAP Certificate #2374 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 29 October, 2002 
 Gary
Lieberman Harding ESE 
 90 Digital Drive 
 Novato, CA 94949

 RE: General Commercial Sequoia Work Order. P210470 

Enclosed are the results of analyses for samples received by the laboratory on 10/21/02 06:35. If you have any questions concerning this report, please feel
free to contact me. 
  

	
	Sincerely,
	
	Michelle M. Wiita Project Manager

 CA ELAP Certificate #2374 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 18 October, 2002 
 Gary
Lieberman Harding ESE 
 90 Digital Drive 
 Novato, CA 94949

 RE: General Commercial Sequoia Work Order: P209467 

Enclosed are the results of analyses for samples received by the laboratory on 09/19/02 13:00. If you have any questions concerning this report, please feel
free to contact me. 
  

	
	Sincerely,
	
	Michelle M. Wiita Project Manager

 CA ELAP Certificate #2374 

 

 

 

 

 

 

 

 

 Environmental Baseline Survey 

NASA Research Park Parcel 5 
 Moffett Federal Airfield

 Moffett Field, California 
 Prepared for 

 

	
	PAI/ISSI
	
	 NASA Ames Research Center

	 Moffett Field, California 94035-1000 Harding ESE Project No. 50487
32

  

	
	  

	
	Gary A. Lieberman
	Senior Geologist
	
	  

	
	Janet Peters RG
	Principal Geologist

 December 28, 2000 
  

 

  
 2 

 Environmental Baseline Survey 

NASA Research Park Parcel 5 
 Moffett Federal Airfield

 Moffett Field, California 
 Harding ESE Project
No. 50487 32 
 This document was prepared by Harding ESE, Inc (Harding ESE, formerly Harding Lawson Associates) at the direction of PAI/ISSI for the
sole use of PAI/ISSI, NASA, the U.S. Environmental Protection Agency, the California Environmental Protection Agency, Department of Toxic Substances Control, the California Environmental Protection Agency, Regional Water Quality Control Board, the
U.S. Navy, the Middlefield-Ellis-Whisman (MEW) Companies, and prospective NASA partners, the only intended beneficiaries of this work. No other party should rely on the information contained herein without the prior written consent of the PAI/ISSI
and NASA. This report and the interpretations, conclusions, and recommendations contained within are based in part on information presented in other documents that are cited in the text and listed in the references. Therefore, this report is subject
to the limitations and qualifications presented in the referenced documents. 

 CONTENTS 
  

													
	 1.0
	  	 INTRODUCTION
	  	 	1	 
		  	 1.1
	  	 Purpose
	  	 	1	 
		  	 1.2.
	  	 Procedures for Conducting an Environmental Baseline Survey
	  	 	2	 
		  	 1.3
	  	 Limitations
	  	 	2	 
		  	 1.4
	  	 Document Organization
	  	 	3	 
			
	 2.0
	  	 SURVEY METHODOLOGY
	  	 	4	 
		  	 2.1.
	  	 Approach and Rationale
	  	 	4	 
		  	 2.2.
	  	 Program Review
	  	 	4	 
		  	 2.3
	  	 Document Review
	  	 	5	 
		  	 2.4
	  	 Interviews
	  	 	5	 
			
	 3.0
	  	 BACKGROUND
	  	 	6	 
		  	 3.1.
	  	 Physical Setting
	  	 	6	 
		  	 3.2.
	  	 History
	  	 	6	 
		  	 3.3
	  	 Environmental Setting
	  	 	7	 
		  		  	 3.3.1
	  	 Physical Characteristics
	  	 	7	 
		  		  		  	 3.3.1.1
	  	 Surface Features
	  	 	7	 
		  		  		  	 3.3.1.2
	  	 Surface Water
	  	 	8	 
		  		  		  	 3.3.1.3
	  	 Meteorology and Climatology
	  	 	8	 
		  		  		  	 3.3.1.4
	  	 Geology
	  	 	9	 
		  		  		  	 3.3.1.5
	  	 Hydrogeology
	  	 	9	 
		  		  		  	 3.3.1.6
	  	 Habitat and Threatened or Endangered Species
	  	 	10	 
		  		  		  	 3.3.1.7
	  	 Archeological Resources
	  	 	12	 
		  	 3.4
	  	 Environmental Restoration Programs
	  	 	13	 
		  		  	 3.4.1
	  	 Installation Restoration Program
	  	 	14	 
		  		  	 3.4.2
	  	 Groundwater Contamination – West Side Aquifers/Regional Groundwater Plume
North of 101
	  	 	15	 
		  		  	 3.4.3
	  	 Risk Assessments
	  	 	16	 
		  	 3.5
	  	 Environmental Compliance Programs
	  	 	17	 
		  		  	 3.5.1
	  	 Hazardous Materials and Waste Management
	  	 	17	 
		  		  	 3.5.2
	  	 Storage Tanks
	  	 	18	 
		  		  	 3.5.3
	  	 Medical/Biohazardous Waste
	  	 	18	 
		  		  	 3.5.4
	  	 Lead-Based Paint
	  	 	19	 
		  		  	 3.5.5
	  	 Spent Abrasive Materials
	  	 	19	 
		  		  	 3.5.6
	  	 Radioactive Materials
	  	 	19	 
		  		  	 3.5.7
	  	 Mixed Waste
	  	 	20	 
		  		  	 3.5.8
	  	 Radon
	  	 	20	 
		  		  	 3.5.9
	  	 Storm Water Discharges and System
	  	 	20	 
		  		  	 3.5.10
	  	 Wastewater
	  	 	21	 
		  		  	 3.5.11
	  	 Air Quality
	  	 	21	 
		  		  	 3.5.12
	  	 Emissions Inventory
	  	 	22	 
		  		  	 3.5.13
	  	 Indoor Air Testing
	  	 	22	 
		  		  	 3.5.14
	  	 Building 566 Passive Gas Monitoring Survey
	  	 	23	 

  
 i 

													
		  		  	 3.5.15
	  	 Asbestos
	  	 	24	 
		  		  	 3.5.16
	  	 Pesticides
	  	 	24	 
		  		  	 3.5.17
	  	 Polychlorinated Biphenyls
	  	 	25	 
		  		  	 3.5.18
	  	 Ordinance
	  	 	25	 
		  		  	 3.5.19
	  	 Mold
	  	 	25	 
		  	 3.6
	  	 Closure Plans
	  	 	26	 
			
	 4.0
	  	 FINDINGS FOR PARCEL 5
	  	 	27	 
		  	 4.1
	  	 History and Current Usage
	  	 	27	 
		  	 4.2
	  	 Environmental Restoration Programs
	  	 	27	 
		  		  	 4.2.1
	  	 Site 10
	  	 	28	 
		  		  	 4.2.2
	  	 Site 14
	  	 	28	 
		  		  	 4.2.3
	  	 Site 15
	  	 	28	 
		  		  	 4.2.4
	  	 Site 16
	  	 	29	 
		  		  	 4.2.5
	  	 Site 18
	  	 	29	 
		  	 4.3
	  	 Environmental Compliance Programs
	  	 	29	 
		  		  	 4.3.1
	  	 Hazardous Waste Management
	  	 	29	 
		  		  	 4.3.2
	  	 Hazardous Materials Management
	  	 	29	 
		  		  	 4.3.3
	  	 Storage Tanks
	  	 	29	 
		  		  		  	 4.3.3.1
	  	 Underground Storage Tanks, Oil/Water Separators and Sumps
	  	 	29	 
		  		  		  	 4.3.3.2
	  	 Aboveground Storage Tanks
	  	 	30	 
		  		  	 4.3.4
	  	 Lead-Based Paint
	  	 	30	 
		  		  	 4.3.5
	  	 Air Quality
	  	 	30	 
		  		  	 4.3.6
	  	 Asbestos
	  	 	31	 
		  		  	 4.3.7
	  	 Polychlorinated Biphenyls
	  	 	31	 
		  	 4.4
	  	 Discussion of Findings
	  	 	31	 
			
	 5.0
	  	 BIBLIOGRAPHY
	  	 	33	 

 TABLES 
  

			
	 1.
	 	 History of Installation Operations

		
	 2
	 	 Installation Restoration Program Sites

		
	 3
	 	 Underground Storage Tank Status

		
	 4
	 	 Aboveground Storage Tank Status

		
	 5
	 	 Lead Sampling Results

		
	 6
	 	 Asbestos Survey/Sampling
Results

  
 ii 

			
	 7
	 	 PCB Impacted Transformers/Capacitors

		
	 8
	 	 Building List Summary

		
	 9
	 	 Monitoring and Extraction Well Ownership and Total Depth

		
	 10
	 	 Former Hazardous Materials and Waste Locations

		
	 11
	 	 Current Hazardous Materials and Waste Locations

	
	PLATES
		
	 1.
	 	 Site Vicinity Map

		
	 2
	 	 Site and Parcel Location Map

		
	 3
	 	 IRP Location Map

		
	 4
	 	 Well and Treatment System Location Map

		
	 5
	 	 Storage Tank Location Map

		
	 6a
	 	 Utility Location Map #1

		
	 6b
	 	 Utility Location Map #2

	
	APPENDICES
		
	 A
	 	 PARCEL ENVIROMENTAL SUMMARYR REPORTS

		
	 B
	 	 PLUME AND ALLOCATION MAPS

		
	 C
	 	 BURROWING OWL LOCATION MAP

		
	 D
	 	 ARCHEOLOGICAL SENSITIVE AREAS

	
	DISTRIBUTION

  
 iii 

 ACRONYMS 
  

			
	 1,1,l-TCA
	  	 I, I, I-Trichloroethane

	 1,2-DCA
	  	 1,2-Dichloroethane

	 1,1-DCA
	  	 1,1-Dichloroethane

	 1,1,2-TCA
	  	 1,1,2-Trichloroethane

	 1,1-DCE
	  	 1,1-Dichloroethene

	 1,2-DCE
	  	 cis and trans-1,2 -dichloroethene

	 ACGIH
	  	 American Conference of Governmental Industrial Hygienists

	 ACM
	  	 Asbestos Containing Material

	 AOis
	  	 Areas of Investigation

	 AST
	  	 Aboveground Storage Tank

	 BRAC
	  	 Base Realignment & Closure Program

	 CalEPA
	  	 California Environmental Protection Agency

	 CANG
	  	 California Air National Guard

	 CERCLA
	  	 Comprehensive Environmental Response, Compensation and Liability Act

	 CP
	  	 Closure Plan

	 DFG
	  	 California Department of Fish and Game

	 DOI
	  	 Department of the Interior

	 DTSC
	  	 Department of Toxic Substances Control

	 EA
	  	 Endangerment Assessment

	 EBS
	  	 Environmental Baseline Survey

	 ESAs
	  	 Environmental Site Assessments

	 FEMA
	  	 Federal Emergency Management Agency

	 FFA
	  	 Federal Facilities Agreement

	 FOSL
	  	 Finding of Suitability to Lease

	 FS
	  	 Feasibility Study

	 Harding ESE
	  	 Harding ESE, Inc.

	 HHRA
	  	 Human Health Risk Assessment

	 HWAAs
	  	 Hazardous Waste Accumulation Areas

	 HWMP
	  	 Hazardous Waste Management Plan

	 IRP/OU
	  	 Installation Restoration Program and Operable Units

	 LBP
	  	 Lead-Based Paint

	 LTA
	  	 Lighter-Than-Air

	 MCLs
	  	 Maximum Contaminant Levels

	 MFA
	  	 Moffett Federal Airfield

	 MSL
	  	 Mean Sea Level

	 NACA
	  	 National Advisory Committee for Aeronautics

	 NAS
	  	 Naval Air Station

	 NASA
	  	 National Aeronautics and Space Administration

	 National Register
	  	 National Register of Historic Places

	 NEX
	  	 Navy Exchange

	 NPDES
	  	 National Pollutant Discharge Elimination System

  
 iv 

			
	 NPL
	  	 National Priorities List

	 OF
	  	 Fahrenheit

	 OSHA
	  	 Occupational Safety & Health Administration

	 PA
	  	 Preliminary Assessment

	 PCBs
	  	 Polychlorinated Biphenyls

	 PCE
	  	 Tetrachloroethene

	 PELs
	  	 Permissible Exposure Limits

	 PRGs
	  	 Preliminary Remediation Goals

	 RI
	  	 Remedial Investigation

	 RI/FS
	  	 Remedial Investigation/Feasibility Study Program

	 ROD
	  	 Record of Decision

	 RWQCB
	  	 California Regional Water Quality Control Board

	 STLC
	  	 Soluble Threshold Limit Concentration

	 SWEA
	  	 Station-Wide Ecological Assessment

	 TCE
	  	 Trichloroethene

	 TLV-TWAs
	  	 Threshold Limit Values-Time Weighted Averages

	 USACE
	  	 U.S. Army Corps of Engineers

	 USEPA
	  	 U.S. Environmental Protection Agency

	 USFWS
	  	 United States Fish and Wildlife Service

	 UST
	  	 Underground Storage Tank

	 VOCs
	  	 Volatile Organic Compounds

	 WATS
	  	 West-Side Aquifers Treatment Systems

  
 v 

 1.0 INTRODUCTION 

Harding ESE has prepared this Environmental Baseline Survey (EBS) to present the results of the assessment of known existing environmental conditions for
Parcel 5 at Moffett Federal Airfield (MFA), formerly part of Naval Air Station (NAS) Moffett Field (NAS Moffett Field), California. The subject parcels are heretofore referred to as the NASA Research Park (NRP) Parcels. The location of Moffett Field
is shown on Plate 1 and the NRP is shown on Plate 2. Harding ESE conducted the assessment and prepared this report under contract to PAI/ISSI on behalf of NASA Ames Research Center. 

As shown on Plate l, the NRP Parcels are located along the southern boundary of the Moffett Field and comprise an area of approximately 213 acres that is
being planned for redevelopment as a collaborative research and educational campus. As discussed above and in Section 2.0, the area is within Moffett Field, which was continuously operated by the U.S. military since it was commissioned in 1933
until it was transferred to the National Aeronautics and Space Administration (NASA) in 1994. As described in the Moffett Field Comprehensive Use Plan, Environmental Assessment (Brady & Associates, i994), portions of Moffett
Field will be converted from their former military use and redeveloped as a laboratory and associated offices. In addition, the remainder of NRP is proposed for development as a collaborative research and educational campus as described in the
Notice of intent to Prepare an Environmental impact Statement, published in the Federal Register on June 16, 2000. 
  

	1.1	Purpose 

 The purpose of the EBS is to 1) summarize the known existing environmental condition of the NRP
in a manner that is easy to use by future partners, and 2) evaluate the potential constraints that the existing conditions may have upon future uses. To the extent that the information was available to the authors, the EBS addresses the following:

  

	•	 	Status of the site investigations and remediation 

  

	•	 	Nature and extent of known contamination, if any 

  

	•	 	Hazardous materials and waste management 

  

	•	 	Underground storage tanks (UST) and aboveground storage tanks (AST) 

  

	•	 	Status of building surveys for asbestos, lead-based paint (LBP), and radon 

  

	•	 	Other information pertaining to environmental conditions on the parcel. 

 The EBS focuses on identifying and
documenting environmental site characterization and remediation activities and the presence or likely presence of hazardous substances and/or hazardous waste on a portion of real property considered for reuse. The EBS addresses hazardous substances
or wastes, including certain substances not usually regulated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), and 

  
 1 

 
other substances such as petroleum products, asbestos, LBP, PCBs, and mold in structures to the extent that relevant information is available. The EBS considers soil and groundwater
contamination, and a description of potential public health and safety issues, for example, those associated with the soil or groundwater contamination or the condition of buildings, that may affect NASA’s ability or decision to redevelop such
property. The EBS does not constitute a complete site characterization because it is based on existing available information. In addition, no confirmation/field verification was conducted. 

 

	1.2	Procedures for Conducting an Environmental Baseline Survey 

 Procedures for conducting an EBS are
described in the DoD guidance (U.S. DoD, 1994). The EBS is similar to CERCLA Preliminary Assessment (PA) and may include information from many sources, including ongoing programs, such as CERCLA remedial investigation and remediation,
building surveys for asbestos, LBP, and radon, solid and hazardous waste management activities, and other programs, as discussed in Section 2.0. Specific EBS activities may include the following: 

 

	•	 	Search, review, and documentation of existing records regarding environmental conditions on the parcel 

  

	•	 	Description of known current or past activities on the parcel 

  

	•	 	Interviews with current and/or former employees involved in operations on the parcel 

  

	•	 	Description of known hazardous substance or hazardous waste management practices on the parcel and on adjacent parcels 

  

	•	 	Documentation of observations made during visual and physical inspections (Not conducted for this EBS) 

  

	•	 	Description of possible sources of contaminants on the parcel or on adjacent parcels, on the basis of available information 

  

	1.3	Limitations 

 This document was prepared at the direction of PAI/ISSI for the sole use of PAI/ISSI, NASA,
the U.S. Environmental Protection Agency (USEPA), the California Environmental Protection Agency (CalEPA), Department of Toxic Substances Control (DTSC), the Cal-EPA, Regional Water Quality Control Board (RWQCB), the U.S. Navy, the
Middlefield-Ellis-Whisman (MEW) Companies, and prospective NASA partners, the only intended beneficiaries of our work, to support redevelopment of the NASA Research Park Parcels. No other party should rely on the information contained herein without
the prior written consent of NASA and Harding ESE. 
 Harding ESE’s professional services for this EBS, including the preparation of this document,
were conducted in accordance with practices and procedures generally accepted in the environmental consulting field at this time; no other warranty is given or implied by this report. 

  
 2 

 Information about the presence or absence of hazardous substances in the area discussed in this report is based
on limited data and observations. Environmental conditions may change over time and may be different away from locations where data or samples were collected or observations made. Harding ESE does not and cannot have complete knowledge of
environmental conditions in the area discussed. Furthermore, this report is complete and accurate only to the extent that cited reports and agency information are complete and correct, and to the extent that all relevant information has been
provided to Harding ESE. The purpose of the EBS is to identify and describe available information. In the EBS, Harding ESE has not attempted to independently verify the completeness or accuracy of the information presented, or to independently
assess the environmental condition of the described area. 
  

	1.4	Document Organization 

 The remainder of this report is organized as follows: 

 

	•	 	Section 2.0 provides a description of the methodology used to complete the EBS 

  

	•	 	The background of the site including a physical description, history of the facility, the environmental setting including geology, hydrogeology, surface water, threatened or endangered species and sensitive habitat,
and. archeological resources, and a summary of the environmental restoration and compliance programs is presented in Section 3.0 

  

	•	 	Sections 4.0 describes the Findings for Parcel 5 

  

	•	 	References are provided in Section 5.0 

  

	•	 	A summary of the information for Parcel 5 is presented in Appendix A 

  

	•	 	Appendix B presents plume and environmental cleanup allocation maps for the NRP 

  

	•	 	Burrowing owl locations and archeologically sensitive areas are presented in Appendix C and D, respectively. 

  
 3 

 2.0 SURVEY METHODOLOGY 

 

	2.1	Approach and Rationale 

 A systematic process was followed in which all available reports, records, maps,
and interviews were analyzed. Reported conditions were evaluated to determine their impact on the characterization, remediation, reuse, and occupation of the NRP. On the basis of this information, conclusions were drawn relative to the environmental
condition of the NRP. As discussed previously, physical inspections of the NRP to identify any new potential environmental concerns or to verify information obtained during the records review, were not conducted as part of this EBS. 

Analysis of the ongoing or completed environmental programs at Moffett Field included the following: 

 

	•	 	Building surveys for asbestos and lead based paint (LBP) 

  

	•	 	Building surveys for mold 

  

	•	 	Radon monitoring (limited to residential units and NASA buildings not within the NRP) 

  

	•	 	Management of electrical transformers containing polychlorinated biphenyls (PCBs) 

  

	•	 	Underground and aboveground storage tank (USTs and ASTs) management 

  

	•	 	Basewide Remedial Investigation/Feasibility Study Program (Rl/FS) 

  

	•	 	Installation Restoration and Operable Unit Programs (IRP/OU) 

  

	•	 	Stormwater Pollution Prevention Plan implementation 

  

	•	 	Hazardous Waste Management, Minimization and Spill Contingency Plans 

  

	•	 	Assessment of impacts from adjoining properties (MEW Superfund Site) 

  

	•	 	Evaluation of air quality. 

 Results of each of these programs for Parcel 5 are described in Section 4.0.

  

	2.2	Program Review 

 A review of the ongoing environmental restoration and compliance programs (discussed
above) for the NRP was performed. NASA and PAI/ISSI program managers provided relevant and updated program data. The examination of these programs provided a comprehensive overview of the past and current environmental status of the NRP. After data
evaluation the information was entered into Parcel Summary tables to facilitate record access and summary report production. The table for Parcel 5 is included as Appendix A to support the evaluation of the environmental condition of the NRP. 

  
 4 

	2.3	Document Review 

 The document review process focused on identifying parcel specific surveys,
inspections, studies, field investigations, and interim and final remedial measures especially those completed subsequent to transfer of the NRP from the Navy. 

Documents and information reviewed for this EBS include the following type of reports or investigative and management plans: 

 

	•	 	Site reuse plans 

  

	•	 	Building preliminary assessment/site inspections 

  

	•	 	Work plans and sampling and analysis plans 

  

	•	 	Remedial Investigation and Feasibility Study Reports 

  

	•	 	Building construction information for buildings 

  

	•	 	Results of building surveys for asbestos, LBP, radon, PCBs, and hazardous material/waste 

  

	•	 	Inventories and management plans for USTs and ASTs 

  

	•	 	Air monitoring reports/emissions inventories. 

 A complete list of the documents reviewed is provided in
Section 5.0. 
  

	2.4	Interviews 

 Interviews were conducted with NASA and PAI/ISSI staff familiar with historic and current
environmental restoration and compliance programs. Interviews with past and present employees who worked in the buildings located within the NRP were not performed as part of this EBS. Mr. Joseph Chou of the Cal/EPA Regional Water Quality
Control Board and Ms. Roberta Blank of the U.S. EPA were contacted regarding the environmental restoration programs. 

  
 5 

 3.0 BACKGROUND 

This section presents relevant information about Moffett Field with an emphasis on the NASA Research Park Parcels. It includes a description of the physical
setting, the history of Moffett Field, a summary of the environmental setting, and the environmental restoration and compliance programs. Moffett Field includes NASA Ames Research Center and MFA. Moffett Field also includes the Army housing;
however, the housing is not operated by NASA and is not included in this report. 
  

	3.1	Physical Setting 

 Moffett Field lies 35 miles south of San Francisco, 10 miles north of San Jose, and
about 1 mile south of San Francisco Bay (Plate 1). The facility encompasses about 2,000 acres in Santa Clara County and borders the cities of Mountain View and Sunnyvale, California. To the north of Moffett Field are saltwater evaporation ponds
and wetlands associated with San Francisco Bay; Stevens Creek lies to the west; U.S. Highway 101 runs along the southern perimeter; and Lockheed-Martin Aerospace facilities are located to the east. NASA Ames Research Center is in the northwest
portion of Moffett Field. The area south of U.S. 101 is and has been industrial and includes a group of companies located or formerly located in a 0.5 square-mile area bounded by East Middlefield Road, Ellis Street, Whisman Road, and U.S. 101
referred to as the MEW Superfund Site. These companies are cleaning up soil and groundwater contamination believed to originate within the MEW Superfund site that has also affected groundwater quality beneath the NRP (Tetra Tech, 1998c). 

The NASA Research Park Parcels (Plate 2) are in the southern portion of Moffett Field and comprise 213 acres. The NASA Ames Research Center lies to the north
and west of the NRP, U.S. 101 bounds the NRP to the south, and the runways and hangars of Moffett Federal Airfield lie to the east. 
  

	3.2	History 

 Since the 19th century, the Moffett Field area was used for agriculture. Historic maps show a
series of landings along the bay with connecting roads, stage stops, and residences in the area. (PRC, 1994). 
 The U.S. military continuously
operated the Naval Air Station (NAS) Moffett Field from its date of commission in April 1933 as the Sunnyvale Naval Air Station until it was transferred to NASA on July 1, 1994. A summary of the history of the base operations is provided in
Table 1. NAS Moffett Field’s original mission was to serve as a base for the West Coast dirigibles of the lighter-than-air (LTA) program. The Navy continued to use the station as an air base until October 1935 when it was transferred to
the Army Air Corps for use as a training base. During the Army’s tenure, the National Advisory Committee for Aeronautics (NACA) established Ames Aeronautical Laboratory in December 1939 on land adjacent to the Navy at Moffett Field. 

In April 1942, the base was returned to the Navy and renamed Naval Air Station (NAS) Moffett Field. 

  
 6 

 By 1950, Moffett Field was the largest naval air transport base on the West Coast and became the first all- weather air station. Jets first arrived in 1950 and included fighters (F3Ds, F2Hs, and F7Us). In 1953, the base became home to all Navy fixed-wing, land-based antisubmarine craft. A weapons department was
formed on the base in 1954. 
 In 1958, NASA was created and absorbed NACA; thus it became the NASA Ames Research Center. 

In February 1966, the base activated its high-speed refueling facilities, and in 1973, it became the headquarters of the Commander Patrol Wings, U.S. Pacific
Fleet. 
 Between 1973 and 1994, NAS Moffett Field’s mission involved support of antisubmarine warfare training and patrol squadrons. At one point,
Moffett Field was the largest P-3 base in the world, with nearly 100 P-3C Orion Patrol aircraft. These aircraft were assigned to nine squadrons supported by 5,500 military, 1,500 civilian, and 1,000 reserve personnel. No heavy manufacturing or major
aircraft maintenance was conducted during the last mission; mostly unit- and intermediate-level maintenance occurred. 
 The base was designated for closure
as an active military base under the U.S. Department of Defense Base Realignment and Closure (BRAC) program. The base was transferred in July 1994 to NASA, except the military housing units and associated facilities, which were transferred to
Onizuka Air Force Base. 
  

	3.3	Environmenyal Setting 

  

	3.3.1	Physical Characteristics 

 The following description of physical characteristics discusses surface
features, surface water, meteorology and climatology, geology, hydrogeology, and threatened or endangered species and habitat at Moffett Field. 
  

	3.3.1.1	Surface Features 

 Moffett Field is located near the southern end of San Francisco Bay on nearly flat
fluvial basin deposits. Elevations range from approximately 36 feet above mean sea level (msl) to 2 feet below msl (IT, 1993). Since topographic relief is minimal, manmade structures are the most noticeable surface features and include
buildings, aircraft hangars, roads, parking lots, runways, and landscaped areas. 
 The eastern and western sides of Moffett Field are separated by
northwest trending runways. Most buildings are located on the western side of Moffett Field with the most prominent one being the very large Hangar 1 that at one time housed the dirigible, the USS Macon. Features on the eastern side of Moffett Field
include Hangars 2 and 3, the California Air National Guard (CANG) area, a golf course, and other buildings. Most areas surrounding the buildings are landscaped. 

The area north of Moffett Field was once tidal salt marshes and mud flats of San Francisco Bay. These marshes and mud flats have been eliminated or greatly
altered by diking and filling (IT, 1993). Currently, commercial saltwater evaporation ponds are present north of Moffett Field. A stormwater retention pond·exists on lands of Midpeninsula Regional Open Space District and NASA Ames.

  
 7 

	3.3.1.2	Surface Water 

 San Francisco Bay, California’s largest estuary, is approximately 1 mile north of
Moffett Field. Historically, tidal salt marsh and mud flats covered extensive areas of the southern portion of the bay including the northern portion of Moffett Field. However, most of these wetlands have been eliminated or greatly altered. The
large area north and northeast of Moffett Field was diked several decades ago and is still used as commercial salt evaporation ponds. 
 Surface water
features at Moffett Field include or have included stormwater drainage ditches, several small ponds, and a stormwater retention pond. There are no streams on Moffett Field, although several streams are present to the east and west. Coyote Creek and
Guadalupe Slough drain into San Francisco Bay east of Moffett Field, and Stevens Creek drains into San Francisco Bay to the west. 
 Stormwater in the
eastern portion of the airfield (including the runways and aircraft aprons) drains through a system of surface channels (Patrol Road Ditch and Marriage Road Ditch) and subsurface drains to the Building 191 lift station and is pumped into the
Northern Channel at its western end. Water is pumped from the eastern end of Northern Channel to Guadalupe Slough, which drains to San Francisco Bay. During significant rainfall, temporary lift stations pump water from Patrol Road Ditch and Marriage
Road Ditch directly into the Northern Channel. 
 Stormwater in the western portion of the base drains to the stormwater settling basin via underground
pipes. From the settling basin, the water flows northward through the Eastern Diked Marsh to the stormwater retention pond. 
 On the basis of an initial
assessment study of Moffett Field performed by the Naval Energy and Environmental Support Activity (NEESA), the Federal Emergency Management Agency (FEMA) projects that the eastern portion of Moffett Field will be inundated by 100-year tidal
flooding (NEESA 1984). The 100-year flood is projected to reach 7.5 feet above msl and a significant portion of Moffett Field would be affected. 
  

	3.3.1.3	Meteorology and Climatology 

 Moffett Field experiences a Mediterranean climate with relatively dry, warm
summers and cool, wet winters (IT 1993). Influences from the Pacific Ocean, San Francisco Bay, and cool valley breezes help to maintain moderate temperatures. The average annual temperature is 58 degrees Fahrenheit (°F). The average
monthly temperature in August is 66°F, and the average monthly temperature in January is 50°F. Maximum temperatures have been recorded above 100°F, and minimum temperatures have been recorded as low as 22°F (IT, 1993). 

During the day, moderate northern and northwestern winds are common; during the evening, winds are generally from the west (IT, 1993). Occasionally,
winter storms are accompanied by severe southwestern winds. The average annual wind velocity is 7 miles per hour. 

  
 8 

 The average annual rainfall is 13.2 inches (IT, 1993). Most precipitation falls during the winter with a
dry period from May through September. During December, January, and February, the maximum monthly average precipitation is 2.5 inches, which decreases to between 1 and 2 inches per month during the spring and fall. Rainfall during the dry period is
usually less than 0.5 inches per month. Thunderstorms are rare and can occur during any month, but are not usually intense. Snow is rare, and if it does fall, it does not accumulate. 

Humidity averages 74 percent, with daily highs of 85 percent and lows of 60 percent (IT, 1993). Much of the humidity is attributed to the site’s
proximity to San Francisco Bay. 
  

	3.3.1.4	Geology 

 Moffett Field is located at the northern end of the Santa Clara Valley Basin, about I mile
south of San Francisco Bay. The Santa Clara Valley Basin is a Pliocene-age, large, northwest-trending structural depression between the San Andreas and Hayward faults. The basin is bordered on the west by the Santa Cruz Mountains and on the east by
the Diablo Range. 
 Regionally, the Santa Clara Valley contains up to 1,500 feet of interbedded alluvial, fluvial, and estuarine deposits (Iwamura,
1980). Locally, these sediments consist of varying combinations of clay, silt, sand, and gravel that represent interfingering of estuarine and fluvial depositional environments during the late Pleistocene and Holocene epochs. The interfingering
of fluvial and estuarine sediments in southern San Francisco Bay is related to world-wide fluctuations in sea level during glacial and interglacial episodes of the late Quaternary period (Tetra Tech, 1998c). The fluvial sediments were derived
from the Santa Cruz highlands west of the basin and deposited on an alluvial plain bounded by alluvial fan deposits to the west and baylands to the northeast (Iwamura, 1980). Surface geologic maps indicate that alluvial fan deposits extend
toward the basin approximately to U.S. Highway 101, which forms the southern boundary of Moffett Field. Shallow deposits on Moffett Field are branching river and flood plain deposits. Estuarine deposits are found at the extreme northern end of
Moffett Field. 
  

	3.3.1.5	Hydrogeology 

 Within the northern Santa Clara Valley groundwater basin, watershed boundaries are defined
by drainage divides in the Santa Cruz Mountains and Diablo Range. The contact between the bedrock and Quaternary alluvium defines the extent of the groundwater basin (Tetra Tech, 1998c). Regionally, the Quaternary water-bearing deposits are
divided into a deep, confined aquifer, and a shallow, unconfined aquifer based on the extent of a regional confining layer (Tetra Tech, 1998c). Four regional subdivisions of the upper 250 feet of Quaternary sediments are as follows: 

 

	•	 	Holocene (Recent Interglacial Period) alluvium (A Aquifer zone) 

  

	•	 	Late Pleistocene (Wisconsinan Glacial Period) alluvium (B aquifer zone) 

  

	•	 	Late Pleistocene (Sangamon) Interglacial deposits (B/C acquitard) 

  

	•	 	Pleistocene (Illinoian Glacial Period) alluvium (C aquifer zone). 

  
 9 

 The shallow aquifer (upper 250 feet) is subdivided into the A, B, and C aquifers. A laterally extensive clay
aquitard (B/C aquitard) effectively isolates the C aquifer (160 to 250 feet below ground surface [bgs]) from the upper aquifers. The A/B aquitard may be locally discontinuous. 

The remaining discussion focuses on the A aquifer zones beneath the NRP because the aquifer is most accessible and likely to be impacted by contamination and
because of the relative lack of contamination in the deeper aquifers. 
 The A aquifer extends from a depth of 5 to 65 feet bgs at the western side of
Moffett Field. The A aquifer is divided into the Al- and A2- aquifer zones by a discontinuous, low-penneability horizon (A1/A2 aquitard) located between 25 and 30 feet bgs (Tetra Tech, 1998a). The aquifer consists of sands and gravels with
gravel comprising 20 to 90 percent of the coarse material. In general, groundwater flow is toward San Francisco Bay (north) with a horizontal gradient of 0.004 to 0.005 feet per feet (ft/ft) (PRC, 1996). Depth to groundwater ranges from 5 to
12 feet bgs (Tetra Tech, 1998a) 
  

	3.3.1.6	Habitat and Threatened or Endangered Species 

 This section summarizes the types of habitats occurring at
Moffett Field. A comprehensive assessment of Moffett Field ecology can be found in the Phase II Site wide ecological assessment (SWEA, PRC and Montgomery Watson [MW], 1997). The habitats at Moffett Field have been classified into two major
categories: (1) wetlands and aquatic, and (2) uplands. 
 The wetlands and aquatic habitats have been defined using the United States Fish and
Wildlife Service (USFWS) classification system and the U.S. Army Corps of Engineers (USACE) system discussed in the WESCO (1993) report. The California Department of Fish and Game (DFG) uses the USFWS protocol for wetland classification. The
majority of the wetlands are located in the northern section of Moffett Field bordering the commercial salt evaporation ponds. These areas help to support a variety of species including some listed as endangered under the federal Endangered Species
Act and as California species of special concern. 
 The uplands habitat can be further divided into levee banks, disturbed grasslands, and landscaped
areas. The disturbed grasslands and landscaped areas occur within the NRP. 
 The levee banks provide limited upland habitat bordering the saltwater and
brackish marshes. They range from 5 to 15 feet in height and are mostly covered by grasses and weeds. This type of vegetation provides cover for species such as the California ground squirrel, mourning dove, and various species of rodents. The
location of the banks near the marshes makes them a suitable resting area for waterfowl and wading birds between periods of feeding. They also provide a corridor for predatory mammals that can have an adverse effect on the federally endangered and
special status species occupying these areas. 
 The grasslands are highly disturbed areas that provide limited useable habitat for wildlife. These areas
are located between buildings and runways and are mowed on a regular basis. The burrowing owl has been observed foraging in these areas. This species is listed as a California special status species. Appendix C presents a map showing the most recent
locations where burrowing owls are nesting at Moffett Field. None of these areas are located within Parcel 5. 

  
 10 

 
Specific mitigation measures have been developed for areas where burrowing owls have been identified and are as follows: 
  

	1)	Early in the planning process, review all proposed projects, programs, and activities to determine if they may occur near (i.e., within 250 feet) areas occupied or recently occupied by burrowing owls. For projects that
may occur near owls or their habitat, submit to the Environmental Services Office as soon as possible a preliminary description of the activity, a map showing its proposed location, and a proposed timeline. When applicable, also submit a NEPA
Environmental Checklist. A qualified wildlife biologist must survey the project site. For assistance contact the onsite Wildlife Technician, Chris Alderete at 43532 or (650) 280-7643 (cell). 

 

	2)	Whenever possible, avoid potential impacts to burrowing owls and their habitat (see Appendix C) by: 

  

	 	a.	Considering alternative project locations during the early planning stages. The 23 acres of burrowing owl habitat south of Building 158, and other owl protection areas identified in Appendix C shall be avoided.

  

	 	b.	Scheduling work in areas near burrowing owls to occur outside the nesting season. The nesting season is from February 1-August 31. 

 

	 	c.	Considering alternative approaches that reduce or eliminate potential impacts to burrowing owls. 

  

	 	d.	Reducing the amount of time spent conducting activities near burrowing owls. 

  

	3)	Avoid disturbing active nesting owl burrows during the nesting season, which occurs from February 1-August 31. For disturbances outside the nesting season, obtain proper regulatory approval through the
Environmental Services Office. 

  

	4)	Avoid disturbances that occur within 250 feet of an active owl nest during the nesting season or with 160 feet outside the nesting season. For unavoidable disturbances, work with the Environmental Office to determine
specific owl impacts and required mitigation based on the nature of the project or activity, and its timing, location, and duration. 

  

	5)	Obtain approval from the Environmental Services Office (Code QE) prior to conducting activities near burrowing owls or their habitat. Code QE will obtain permits and approvals from regulatory agencies, as needed.

  

	6)	When applicable, obtain the required Construction Permits (AMI 8829.1) and comply with their conditions, including those related to burrowing owls. 

  
 11 

 Fund and implement mitigation activities identified in the planning stages. These may include the following: 

Avoid impacts to owls by conducting work outside the nesting season, or at a distance from active physical burrows that avoids disturbances (>250 in
nesting season, > 160 feet outside of nesting season). Prevent impacts to owl burrows by: 
  

	 	1.	Keeping the project footprint as small as possible. 

  

	 	2.	Limiting the movement of construction vehicles, size of staging areas, and other disturbances. Protect areas within 160-foot to 250-foot radius from owl burrows. Use fencing or construction tape to delineate work areas
from protected areas. 

  

	 	3.	Placing fencing around active owl burrows for the duration of the project. Barriers must be adequate to prevent disturbance to burrows. Remove fencing when the project is completed. 

If active owl burrows must be destroyed, work with the Environmental Services Office to develop a plan to evict owls from their natural burrows. Eviction
shall occur outside the nesting season. Owls are evicted using temporary “one-way doors” placed on the natural burrow for at least 48 hours. After 48 hours, excavate the natural burrow, and then fill it in to prevent owls from reoccupying
those burrows. Replace lost burrows with artificial burrows at a 3:1 ratio within 300 feet of the destroyed burrows, if possible, or within the closest onsite Burrowing Owl Preserve. 

Historically active and satellite burrows can also be very important for burrowing owl survival. These lesser-used burrows will be evaluated on a case by case
basis by a qualified wildlife biologist, who will determine if mitigation is required. Artificial burrow placement and design will be developed in coordination with the NASA Environmental Services Office. The project proponent must complete
construction of any required artificial burrows prior to project initiation (e.g., beginning construction activities), unless agreed to in writing by the NASA Environmental Services Office. Onsite land set-aside may also be used for mitigation on
larger projects. 
 The landscaped areas provide habitat similar to urban parks. The vegetation is composed of non-native and/or exotic grasses, shrubs, and
trees. These areas can be found near the administration buildings, housing complexes, and the golf course. Species commonly observed in this habitat include the mourning dove, house sparrow, American robin, northern mockingbird, and the fox
squirrel. 
  

	3.3.1.7	Archeological Resources 

 No archeological resources are known to occur within NRP. However, prehistoric
and historic use of the Moffett Field vicinity is well documented and as yet unidentified buried archeological resources could be encountered during ground disturbing activity. Appendix D presents a plate identifying archeological sensitive areas.
To ensure that all resources are properly identified, evaluated and treated (if necessary), the following measures will be initiated: 
  

	•	 	Specific language should be included in the General Specifications section of any contract requiring excavation in regard to the required protection of cultural resources and the procedures to be followed by the
contractor in an unexpected discovery situation. 

  
 12 

	•	 	NASA shall develop an Unexpected Discovery Plan to deal with the inadvertent exposure of subsurface archeological resources during construction, in accordance with 36 CFR 800.11. 

 

	•	 	In lieu of a formal Unexpected Discovery Plan, any construction operations should stop within 3 meters ( 10 feet) of the exposure of an unanticipated archeological materials and a qualified archeologist should be
contacted to evaluate the materials and recommend an appropriate treatment for them (see 36 CFR 800.11.1). 

  

	•	 	It is not considered that there is a high potential for inadvertent exposure of prehistoric Native American skeletal remains and associated grave goods at Moffett Field. However, the region’s Native Americans
consider the graves of their ancestors to be of utmost importance. The remains and the offerings buried with them are sacred to the Native Americans, and there is a strong desire among this community to prevent disturbance of burial sites. The
Native American Graves Protection and Repatriation Act (NAGPRA; Section 3) requires federal agencies to consult with likely descendants and Indian tribes prior to intentional excavation, and requires cessation of activity and notification of
tribes when there is an inadvertent discovery of Native American skeletal remains on federal land. The State of California Native American Heritage Commission (ATTN: Execution Secretary, 915 Capitol Mall, Room 288, Sacramento, CA 95814) can provide
a list of tribes and most likely descendants on request. In the event of discovery of Native American skeletal remains, the implementing regulations 43 CFR 10, subpart B (Federal Register 60(232); 62134-62169, December 4, 1995) of NAGPRA
shall be followed. 

  

	•	 	Curation of any recovered archeological materials not associated with Native American skeletal remains shall be curated in accordance with 36 CFR 79, Curation of Federally Owned and Administered Archeological
Collections Final Rule (Federal Register 55 [177: 5-37639], September 12, 1990). Local repositories meeting the curation standards for archeological materials shall be selected over distant repositories whenever possible. 

 

	•	 	All archeological work shall be conducted under the direction of professional archeologists meeting the qualification standards described in Archeology and Historic Preservation; Secretary of the Interior”
Standards (Federal Register 48 (190: 44716-44742, September 29, 1983). 

  

	3.4	Environmental Restoration Programs 

 Naval Air Station Moffett Field was added to the National Priorities
List (NPL) in July 1987. Work conducted at Moffett Field is being completed under the authority of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and coordinated through a Federal Facilities Agreement (FFA) with
the U.S. Environmental Protection Agency (EPA), Region IX; the California State EPA Department of Toxic Substances Control (DTSC) and the California Regional Water Quality Field are broken into the CERCLA Installation Restoration Program (IRP) and
the non-CERCLA sites, Control Board, San Francisco Bay Region (RWQCB). Environmental Restoration Programs at Moffett (i.e., Petroleum sites) which were and are being addressed in accordance with applicable state regulations. Groundwater beneath the
NRP is impacted by migration of chemicals from the MEW Superfund Site (south of Moffett Field; see also Section 3.1) and from operations at Moffett Field. This is collectively referred to 

  
 13 

 
as the Regional Plumes or the West Side Aquifer north of 101 (Tetra Tech, 1998a; Locus, 1999). In addition, a number of investigations have been conducted at the adjacent NASA Ames
Research Center to evaluate Areas of Investigation (AOIs). However, none of the AOIs are located within the NRP and, therefore, the AOI program is not discussed further. 
  

	3.4.1	Installation Restoration Program 

 Under its IRP, the Navy identified and investigated several locations
for the presence of chemical contamination related to site use. Currently, Moffett Field is divided into five Operable Units (QU1, OU2-West, OU2-East, OU5 and OU6), the West Side Aquifer, and two study areas (petroleum sites and station-wide sites).
OU1 includes Sites 1 and 2. OU2-West includes Sites 8, 10 (Chase Park), 14-North, 16, 17, and 18. OU2-East includes Sites 3, 4, 6, 7, 10 (runways), 11 and 13. OU5 includes the aquifers on the east side of the Moffett Field, and OU6 includes wetland
areas. The West Side Aquifer include the aquifers located under the western portion of the Moffett Field (aquifers west of the runways). The petroleum sites are the non-CERCLA sites and include Sites 5, 9, 12, 14-South, 15, 19, 20 and 24. The
Station-Wide Sites include Sites 21 to 23 as well as other areas of investigation. 
 All OU1, OU2-East, OU5, OU6, the Station-Wide Sites, and Site 8
(OU2-West), lie outside of the area included in the scope of this EBS and are not discussed further. Of the petroleum sites, only Sites 9, 14-South, 15, 19 and 24 are located within the parcels included in this EBS. The following summarizes the IRP
Sites that are located within the NRP. Plate 3 presents their locations, and Table 2 provides a summary. 
  

			
	Parcel 1:	  	West Side Aquifer
		
	Parcel 2:	  	West Side Aquifer
		  	Sites 9, 15, 17
		
	Parcel 3:	  	West Side Aquifer
		  	Site 24
		
	Parcel 4:	  	West Side Aquifer
		  	Site 19
		
	Parcel 5:	  	West Side Aquifer
		
		  	Sites 10, 14-North and South, 15, 16, 18
		
	Parcel 6:	  	None
		
	Parcel 7:	  	None

 The next section describes the groundwater contamination (West Side Aquifer and MEW Plume) as it applies to all parcels, and
summarizes the risk assessments. The remaining sites are discussed within the parcel findings (Section 4.0). 

  
 14 

	3.4.2	Groundwater Contamination - West Side Aquifers/Regional Groundwater Plume North of 101 

 Groundwater
contamination beneath the NRP consists of the commingled MFA and MEW Plumes often referred to as the West Side Aquifers or the Regional Plume North of U.S. Highway 101. It will be referred to in the remainder of this document as the Regional Plume.

 The West Side Aquifer includes the aquifers located under the western portion of Moffett Field (aquifers west of the runways). In 1992, the EPA
determined that because the aquifers on the western side of Moffett Field were being impacted by a groundwater plume from the aforementioned MEW Superfund site to the south of Moffett Field, they were subject to the 1989 MEW Record of Decision
(ROD). Additionally, historical operations at Moffett Field (primarily from the former dry cleaning facility at former Building 88 [Site 18; Parcel 5 northern boundary] and fuel operations at Site 9 [Parcel 2 northwestern portion) also contributed
solvents and fuel products to the MEW groundwater plume. Therefore, cleanup technologies and cleanup levels proposed and used by the Navy for site restoration on the western side of the runway follow those specified in the MEW Record of Decision
(ROD, U.S. EPA, 1989). 
 The remedial investigation (RI) of the MEW area was concluded in 1988 (Harding ESE, 1988). The investigation
included a regional study area bounded by El Camino Real to the south, San Francisco Bay to the north, Mathilda Avenue to the east, and Stevens Creek to the west; and a local study area focusing on three Superfund sites within the MEW area. Volatile
organic compounds (VOCs), especially Trichloroethene (TCE), and 1,1,1-Trichloroethane (1,1,1-TCA), were the most frequently detected. An estimated 98 percent of the mass of TCE and 1,1,1-TCA, and cis- and trans-1,2-dichloroethene (1,2-DCE) in the
groundwater that has emanated from the MEW area exists within 100 feet bgs. The regional VOC plume within this shallow zone extends beneath Moffett Field approximately 5,000 feet north of U.S. Highway 101 (PRC, 1996). The MEW companies have
completed the RI feasibility study (FS) and remedial design, and are currently conducting remedial action activities under U.S. EPA supervision. Construction of the MEW treatment system was completed and routine operations began in October 1998 (
Tetra Tech, 1999a). Their treatment system is located on Parcel 2 (Plate 4). According to the MEW ROD ( U.S. EPA 1989), the voes in the groundwater are being cleaned up to maximum contaminant levels (MCLs). Quarterly monitoring is being
conducted to evaluate the plume conditions and remedial progress (Locus, 1999). 
 The remedial investigation work for the Navy portion of West Side
Aquifer was completed in 1992 ( Tetra Tech, 1998a). Several source areas of potential Navy-related groundwater contamination were identified. Potential groundwater source areas identified included an old fuel storage tank farm and former Navy
Exchange (NEX) Service Station (Site 9), a former aircraft wash rack and sump (Site 15), and a former dry cleaners (Site 18). The former tank farm and NEX station, (Site 9) have been identified as sources of petroleum-related contamination, but do
not appear to be sources of VOC contamination. The former dry cleaner (Site 18-Parcel 5) has been identified as a source of VOC contamination, particularly tetrachloroethene (PCE). The wash rack (Site 15, Sump 25, Parcel 5) is considered a VOC
source (Tetra Tech, 1998a). The Navy designed and installed the West-Side Aquifers Treatment System (WATS) on Parcel 2 (Plate 4) (Tetra Tech, 1999b) to extract VOCs and petroleum contamination from groundwater in the A1- and A2-aquifer
zones. Groundwater is being cleaned up to MCLs for VOCs (U.S. EPA,  

  
 15 

 
1989) and for the petroleum hydrocarbons, to the levels shown in the Basewide Petroleum Site Evaluation Methodology Technical Memorandum ( Tetra Tech, 1998b). Monitoring is being
conducted to monitor the plume conditions and remedial progress. Responsibility for remediation of the West Side Aquifer has been allocated among MEW, Navy and NASA in accordance with the Allocation and Settlement Agreement (see Allocation map in
Appendix B). 
 Monitoring of the groundwater contamination plume associated with the MEW site and former Navy activities at Moffett Field (West-side
Aquifers) is being conducted; water-levels are measured on a quarterly basis, and groundwater sampling is conducted by the Navy and the MEW Companies. Based on the most recent available data the contaminants of primary concern present in groundwater
beneath the parcels include TCE, 1,1:1-TCA, PCE, 1,1-dichloroethane (1,1-DCA), 1,1-dichloroethene (1,1-DCE), cis- and trans-1,2-dichloroethene (1,2-DCE), dichlorobenzene, chloroform, freon 113, phenol and
vinyl chloride. The VOCs TCE and 1,1,1-TCA are the most frequently detected and widespread ( Tetra Tech, 1999a). 
 The current plume limits, for
TCE, benzene and TPHs and their respective concentrations are presented in Appendix B. Extraction wells and piping associated with the system are located on Parcels 1, 2, 3, and 5. 

 

	3.4.3	Risk Assessments 

 A human health risk assessment (HHRA) was conducted to evaluate the carcinogenic and
noncarcinogenic risk for potential future residential, occupational, and recreational receptors at Moffett Field. The HHRA was included with the station-wide RI report (PRC, 1996). In addition station-wide ecological risk assessments (SWEAs)
were conducted (PRC and MW, 1995, and 1997). Both of these focused on the wetland areas and the runway and surrounding hangars and maintenance facilities and did not address the areas occupied by the redevelopment property. 

According to Joseph Chou of the RWQCB, risk assessments are in the process of being prepared for many of the petroleum sites (Personal communication,
2000). 
 In accordance with the MEW ROD, an Endangerment Assessment (EA) was prepared for the MEW Site (including Moffett Field) to address the
potential affects to human health and the environment for the environmental conditions at that time (/CF-Clement, 1988). The EA evaluated the potential risks posed by contamination existing in 1988 without considering future remedial actions
proposed for the Site. The assessment focused primarily on risks from exposure to contaminated groundwater, but also qualitatively evaluated risks to construction workers as well as a worst-case scenario where residential units would be constructed.
The EA concluded that there was not a significant risk over most of the MEW area because of the relatively low volatile organic compounds (VOC) concentrations in exposed surface soils under the then current use conditions. However, the EA did
qualitatively note that redevelopment of the Site could lead to significant exposure to contaminants present in subsurface soils through inhalation of vapors or dust assuming that no remedial action was taken at the Site. 

NASA is preparing a Risk Evaluation specifically for the NRP. 

  
 16 

	3.5	Environmental Compliance Programs 

  

	3.5.1	Hazardous Materials and Waste Management 

 In the early 1990s the Navy implemented several programs to
better manage hazardous materials and waste at the facility. The programs were as follows: 
  

	•	 	Hazardous Waste Management Plan - The Hazardous Waste Management Plan (HWMP) was drafted in April 1991 to ensure that NAS Moffett Field’s program met all federal, state, and local regulations (NAS Moffett Field,
1991b) 

  

	•	 	Hazardous Waste Minimization Plan - A used oil and solvent recycling management plan was completed for NAS Moffett Field in October 1989 to reduce generation of NAS Moffett Field’s hazardous waste output (Naval
Energy and Environmental Support Activity [NEESA], 1989) 

  

	•	 	Spill Contingency Plan - The NAS Moffett Field Spill Contingency plan was completed in February 1989 to present procedures for responding to spills and notification of organizations if spills occur (NAS Moffett
Field, 199Ja). 

 No evidence of audits/investigations conducted to evaluate the Navy programs performance exists in the records reviewed.

 Review of file documents did indicate that several investigations and assessments have been completed to evaluate the status of the management programs
for specific buildings and to address whether hazardous materials or waste were present at the facility at the time of base transfer. These investigations/assessments included: 

 

	•	 	A number of Phase 1 Environmental Site Assessments (ESAs) were conducted in the early 1990s for NASA by Boeing Aerospace Operations Inc. (Boeing, 1993a and 1993b), Chemical Waste Management Inc. (CWMI, 1993a,
1993b, 1993c and 1993d), SEC Donahue Inc. (SEC Donahue, 1993), and Uribe and Associates (Uribe, 1993) for buildings at Moffett Field including buildings within the NRP. The ESAs identified whether hazardous materials or waste were
present at the buildings evaluated. 

  

	•	 	The Base Realignment and Closure (BRAC) Cleanup Plan (PRC Environmental Management, Inc [PRC], 1994), presented a history of hazardous waste generating activities at Moffett Field. 

 

	•	 	In August 1995, a multi-media audit was conducted for NASA by SAIC (SAIC, 1995). As part of the audit, SAIC evaluated hazardous waste management practices. Results of the audit indicated that no significant risk
to the environment existed from current hazardous waste management practices. 

 These investigations/assessments indicated that many of the
buildings within the NRP used hazardous materials and generated hazardous wastes. 

  
 17 

 In 1995, NASA established a three-year schedule for assessing environmental media utilizing the Environmental
Protection Agency’s (EPA’s) Generic Protocol for Conducting Environmental Audits of Federal Facilities (1996 Revision). However, users are required to augment the protocol to address new requirements, state requirements and unique
operations. 
 Compliance with the various items outlined in the EPA Protocol is established through self-assessments consisting of interviews, site visits,
and review of records. If deficiencies are identified during a self-assessment, they are written in draft form and given to the responsible department for a 10-day review period. The purpose of the review
period is to allow the affected parties to resolve the issue, correct any period, any deficiencies that could not be fully resolved were included in the final report. Affected parties inaccuracies in the findings and participate in the
recommendations. At the end of the 10-day review are required to agree to the recommended corrective action plan and give an estimated date of completion. Progress toward completion is tracked on a monthly basis. 

The most recent Environmental Self-Assessment to include hazardous materials management and hazardous waste management was conducted in 1998 (NASA, 1998).
The pertinent findings from that report (now resolved) indicated that the only non compliance items were labeling deficiencies in hazardous materials storage areas. An inventory of hazardous waste generated between 1994 and the present has been
prepared by NASA. A list of buildings where hazardous waste was generated between 1994 and the present is presented as Table 11. 
 NASA has begun the
preparation of closure plans for the buildings within the NRP parcels. The closure activities will include visual surveys and a determination of whether the problems identified in the above investigations/assessments were addressed or if others
exist. Sampling will be conducted if necessary (Personal Communication, 2000b). 
  

	3.5.2	Storage Tanks 

 A total of 155 former and current USTs, ASTs, oil/water separators (OWS) and sumps have
been identified at Moffett Field (Tetra Tech, 1999a). Tanks present on the NRP are identified on Plate 5 and summarized on Tables 3 and 4. The numbering system and location of the storage tanks was derived from the BRAC Cleanup Plan,
(PRC, 1994) and the Baseline Environmental Report (Tetra Tech, 1994). According to Tetra Tech (l999a) the majority of tanks/OWS/sumps at Moffett Field have been removed and no further investigations were required. However,
documentation indicating regulatory agencies approved closure for the majority of these tanks was not available. In a letter to the Navy dated August 8, 2000, the RWQCB granted closure for 13 tanks at Moffett Field (RWQCB, 2000). Five of the
former tank locations are present within the NRP. Several of the removed tanks/OWS/sumps required investigations as part of the IRP investigations; discussions for these investigations are included in the parcel findings (Section 4.0). 

 

	3.5.3	Medical/Biohazardous Waste 

 No medical/biohazardous waste has been or is generated within the NRP. The
only medical/biohazardous waste generated at NAS Moffett Field was by the Naval Regional Hospital Branch Clinic, which is (NEESA, 1991) located outside the NRP west of Parcel 1. Medical/biohazardous waste is not discussed further in this
document. 

  
 18 

	3.5.4	Lead-Based Paint 

 Lead-based paint (LBP) was in common use prior to 1978, at which point its use was
discontinued. No LBP survey has been performed at NAS Moffett Field; therefore, based on the age, it is assumed that the majority of buildings/structures within the NRP contain lead. Some buildings at Moffett Field have been sampled as a result of
modifications being performed. Table 5 presents a summary of the building construction dates, lists buildings that were sampled and their sample dates, and identifies which sampled buildings detected LBP. 

In July and August 1993, as part of a facility wide investigation to evaluate the presence of lead around the perimeter of buildings that may have had lead
based painted exteriors, CWMI collected 332 surface soil samples. Lead was detected above the residential Preliminary Remediation Goal (PRG) of 400 milligrams per kilogram (mg/kg) and/or soluble threshold limit concentration (STLC) of five
milligrams per liter (mg/I), in perimeter soil at many of the building locations (CWM/, / 993e). In addition, perimeter soil at several locations also exceeded the industrial PRG of 1,000 mg/kg. Table 5 presents a summary of the building
perimeters sampled within NRP and lists which buildings exceeded residential and industrial PRGs. The EPA conducted a follow-up sampling investigation around some of the buildings in July 1998. Roy F. Weston (Weston), under the direction of the EPA,
collected 120 soil samples around 11 selected buildings. These results indicated that the residential or industrial PRG was exceeded in at least one sample collected from seven of the building locations (USEPA, 1998). LBP issues for Parcel 5 are
discussed in Section 4.0. 
 Lead surveys of the buildings including sampling of the building material and soil shall be conducted by NASA at the
partners expense, if appropriate, prior to demolition, rehabilitation, or occupancy of any buildings within the NRP (Personal Communications, 2000b). 
  

	3.5.5	Spent Abrasive Materials 

 Uncontrolled blasting may have occurred in aircraft support zones within the
NRP parcels but no documented locations are known. Abrasive materials are not discussed further in this report. 
  

	3.5.6	Radioactive Materials 

 A radiological survey was performed on December 7 and 8, 1993 at the Navy
Weapons Storage and Laboratory Buildings (Buildings 459, 484, 486, 487, 490 and 4XC1, all located east of the runway with the exception of Building 459 located in Parcel 5) to declassify and make available the rooms for unrestricted use. The rooms
had been used by the Navy for storage of Naval Weapons and handling of hazardous materials used with the weapons. Results of the sampling indicated that all results were below background levels; no radioactive contamination was found during the
survey, and the rooms were released for unrestricted use (CWM/, 1994). 
 According to Bill Vermeere, PAI/ISSI Radiologist Specialist (Personal
Communication, 2000), radiological materials are only used in the Hangar 2 and 3 areas and in several NASA buildings. Additionally, radiation calibration materials are also used in Building 19 (Parcel 1). None of these areas/buildings are
located within Parcel 5. On the basis of this communication, radioactive materials are not discussed further in this document. 

  
 19 

	3.5.7	Mixed Waste 

 On the basis of the results of Phase 1 ESAs conducted in the early 1990s for NASA by CWMI
(CWM/, 1993a, / 993b, / 993c and 1993d), SEC Donahue (SEC Donahue, 1993), Uribe ( Uribe, 1993), and the multi-media audit conducted by SAIC in August 1995, there are no mixed waste storage areas located within the NRP. Mixed
waste is not discussed further in this document. 
  

	3.5.8	Radon 

 Federal law requires every federal department or agency that owns federal buildings to conduct a
study to evaluate radon contamination in those buildings. Navy policy also requires that all buildings and housing units occupied for more than four hours per day be tested for radon gas. Any structure that has radon levels greater than four
pico-curies needs to have mitigation actions performed. 
 In 1988 and 1989, a radon survey was conducted for 16 NASA buildings that are not part of the
NRP. Samples were taken over a 7 day period between December 27, 1988 and January 2, 1989. Results of the sampling indicated that radon was not detected above detection limits ranging between 0.3 and 0.7 picoCuries per liter of air
(pCi/L) (NASA-ARC, 1989). Additionally in 1989, as part of a NASA radon monitoring program conducted at 13 NASA installations in the United States, 107 canisters were set up at 23 buildings to monitor for radon over an approximate 116 day
period. None of the canisters detected radon above 1 pCi/L ( Unknown Source). 
 NAS Moffett Field’s initfal screening process of the housing
units reportedly showed high levels of radon (Tetra Tech, 1994). Assessment of the housing units began in March 1993 by installing 807 radon detectors in the housing units. Two non-housing units were also reportedly screened. Building
153(Parcel 5) and another unidentifiable building screening results indicated that high levels of radon were not identified. 
 On the basis of several
memorandums present in NASA files it appears that radon surveys were also performed for 13 other buildings within Moffett Field. Two of the Buildings (23 and 25) are located in Parcel I, five of the buildings (111, 146, 153, 154, 155) are located in
Parcel 5, and the remaining buildings (256, 511, 956B, C, and D and Hangar 3) are scattered throughout Moffett Field. Results of these surveys did not identify radon above I pCi/L (Department of the Army [Army], 1994). 

On the basis of the results of the radon monitoring programs conducted for the Moffett Field buildings and the similarities between those buildings and the
NRP buildings, it is unlikely that radon is present in buildings within NRP above the EPA’s 4 pCi/L action level, and it is not discussed further in this document. 
  

	3.5.9	Storm Water Discharges and System 

 NASA holds a general industry storm water discharge permit.
Additionally, the Navy received a National Pollutant Discharge Elimination System (NPDES) permit from the RWQCB on October 20, 1998 and August 25, 1999 for authorization to discharge treated groundwater from the East-Side and West-Side
Aquifer Treatment Systems respectively. After treatment discharge requirements are met, the groundwater is discharged to the storm water drain system. In 1994 

  
 20 

 
Stanford University received a NPDES permit from the RWQCB to investigate in-situ biodegradation methodologies for restoration of contaminated aquifers. This program, being performed for the EPA,
studies the degradation of halogenated compounds and includes the injection and extraction of small quantities of groundwater. After treatment to meet the NPDES discharge requirements, the groundwater is also discharged to the storm drain system.
The MEW companies also discharge treated groundwater under an NPDES permit to Stevens Creek. 
 NASA implemented a storm water pollution prevention program
plan for Moffett Field in 1992 and currently performs storm water monitoring at seven locations within the Moffett Field facility under the general permit. None of the sampling locations are located within the NRP. Review of the latest available
storm water monitoring report indicated that TCE, copper, lead, zinc, and pH exceeded the San Francisco Bay Basin Water Quality Control Plan shallow surface water limits during the latest monitoring round (SAIC, 1999b). The TCE and pH
exceedances were just above the control plan limits of 5.0 micrograms per liter (μg/L) and 6.5 - 8.5 respectively. The three metals were three to four times the control plan limits of 23.6, 5.6 and 170 (μg/L). 

Investigations were conducted by Insituform Technologies Inc. (ITI) Salem, Oregon to evaluate the integrity of the storm drain systems. According to the ITI
report, the pipelines had problems such as grease inflow, root infiltration, misaligned and broken joints, radial and longitudinal cracks, and holes in pipes. According to the ITI report, the problem areas have been reconstructed using cured in
place pipe and appear in like new condition (ITI, 1997a) 
  

	3.5.10	Wastewater 

 The wastewater sewer collection system at Moffett Field connects with a force main to the
city of Sunnyvale treatment plant. Industrial wastewater discharge occurs within NRP. 
 Investigations were conducted by ITI to evaluate the integrity of
the sanitary sewer system in May 1997. According to the m report, the pipelines had grease inflow, root infiltration, misaligned and broken joints, radial and longitudinal cracks, and holes in the pipe. The pipelines have now been reconstructed
using cured in place pipe and appear in “like new” condition (ITI, 1997b). 
  

	3.5.11	Air Quality 

 Air quality issues have been investigated as part of several studies undertaken at the
facility as follows: 
  

	•	 	Hazardous Air Pollutant Emissions Inventory, 1996 (SAIC, 1996 and 1999) 

  

	•	 	Indoor Air Testing, Various Buildings 1999 and 2000 (SAIC, 2000 and Harding ESE, 2000) 

  

	•	 	Passive Gas Monitoring Survey of Indoor Ambient Air and Subsurface Organic Vapors, Building 566 (SAIC, 1999). 

  
 21 

 Each study is summarized below. Additionally NASA and several of the resident agencies have permits to operate
Air Pollution Sources from the Bay Area Air Quality Management District (BAAQMD). A list of current sources is provided as applicable for each parcel. 
  

	3.5.12	Emissions Inventory 

 The Hazardous Air Pollutant Emissions Inventory measured and evaluated emission
rates of chemicals from sources around the Moffett Field facility including those within the NRP. This investigation quantified emissions from: 
  

	•	 	Abrasive blasting 

  

	•	 	External Combustion 

  

	•	 	Internal Combustion 

  

	•	 	Fuel Storage and Transfer 

  

	•	 	Hazardous Materials 

  

	•	 	Welding and Soldering. 

 NASA Ames and Moffett Field were investigated separately and emission results were
evaluated for each area. The most significant air emission at NASA was found to be toluene (1298.71 pounds/year) from predominantly hazardous materials use. The most significant air emission at Moffett Field was found to be ethylene glycol (1379.08
pounds/year), also from predominantly hazardous materials use. 
  

	3.5.13	Indoor Air Testing 

 In 1999, SAIC conducted an indoor air quality testing program for NASA to measure
the levels of VOCs in Hangar 1 and Buildings 6, 21, 22, 111, 148, and 156. These buildings were selected based on their location with respect to the West Side Aquifer groundwater plume. Buildings 26 and 269 are not located over the plume, and served
as background sampling locations. Outdoor air samples were also collected concurrently outside buildings 6, 111, 148, and 566 in order to determine ambient VOC levels for the area. With the exception of Building 269, all the buildings discussed
above are located within the NRP. 
 Low levels of 21 VOCs were detected in at least some of the buildings tested. Concentrations of all detected VOCs were
far below the Occupational Safety and Health Administration (OSHA) permissible exposure limits (PELs) and the American Conference of Governmental Industrial Hygienists (ACGIH) threshold limit values - time weighted averages (TLV-TWAs). Eight VOCs
were detected above the EPA Region 9 Preliminary Remediation Goals (PRGs), adjusted for a residential exposure scenario of 24 hours per day over 20 years. Those VOCs were TCE, benzene, chloromethane, 1,2-DCA, 1,1,2-trichloroethane, chlorobenzene,
1,4-dichlorobenzene, and 1,4-dioxane. All other compounds detected in the buildings were found at concentrations below their respective PRGs for the adjusted exposure scenario. 

  
 22 

 In Spring 2000, Harding ESE conducted an indoor air quality testing program for NASA to measure the levels of
VOCs in Buildings 476 and 543 (located within Parcel 5) to evaluate the potential for using these buildings as dormitory/living quarters. The analysis for the 26 VOCs was divided into three classes: aromatic hydrocarbons, chlorinated hydrocarbons,
and “other VOCs”. Results of the testing program were compared to OSHA PELs, ACGIH TLV-TWAs, and EPA Region 9 PRGs adjusted for an exposure period of 16 hours per day over 5 years. The following results were noted: 

 

	•	 	Low levels of some aromatic hydrocarbons (benzene and toluene) were present in all of the rooms in both buildings, and in an outside ambient air sample collected in the vicinity of each of the buildings, but did not
exceed any of the standards used for comparison. 

  

	•	 	No chlorinated hydrocarbons were detected in the ambient air sample. Perchloroethylene was detected at very low concentrations for two of the five samples taken in Building 476. 1,1,1-TCA was detected in one sample of
five in Building 543. All other indoor measurements for chlorinated hydrocarbons were non-detects. None of the measured levels exceeded the PEL, the TLV-TWA, or the adjusted EPA PRG. 

 

	•	 	The only “other VOC” detected at concentrations above any of the standards used for comparison was 1,4-dioxane, which was detected above its adjusted EPA PRG. The compound was detected in the ambient air
sample and for all indoor samples for both buildings. The levels of 1,4-dioxane exceeded the adjusted PRG for one of five samples in Building 476 and for four of five samples within Building 543. The ambient air concentration for 1,4-dioxane also
exceeded the adjusted PRG. All of the “other VOC” compounds were either non-detected or below the respective PEL, TLV-TWA, and the adjusted EPA PRG. Based on the sampling conducted to date, it is unclear whether 1,4-dioxane is emanating
from the plume, the building materials, or both. 

 A discussion of these results, as they pertain to Parcel 5, is presented in
Section 4.0. 
  

	3.5.14	Building 566 Passive Gas Monitoring Survey 

 In January 1999, SAIC performed a passive gas monitoring
survey for NASA of indoor ambient air and subsurface organic vapors at building 566 (located within Parcel 1) to evaluate whether chlorinated organic vapors (TCE, PCE, 1,1,1-TCA, cis 1,2-DCE, and vinyl chloride only) have migrated from the
groundwater into Building 566 and its surrounding soils. The evaluation used Gore-Sorber technology, a passive soil gas sampling technology that allows transfer of vapors to microporous membranes which absorb the organic materials. 

A total of 43 Gore-Sorber modules were used for this evaluation as follows: 
  

	•	 	10 located three-feet bgs around perimeter of building 

  

	•	 	10 located six inches bgs around perimeter of building 

  

	•	 	12 scattered throughout inside of building at floor level 

  
 23 

	•	 	5 at in-take vents in ceiling tile inside building 

  

	•	 	1 at floor level of conference room 

  

	•	 	1 in the HVAC unit in north exterior of building 

  

	•	 	l in the vent intake in north exterior of building 

  

	•	 	3 in “contaminated” groundwater monitoring wells in building vicinity. 

 Sampling duration was
dependent upon whether the module was located above or below ground surface. Modules above ground surface were sampled between January 12 and 19, 1999 and subsurface modules were sampled over a two week period between January 12 and 26,
1999. 
 Of the five analytes of concern, only TCE and 1,1,1-TCA were detected or exceeded minimum detection limit in subsurface (excluding wells) or
building samples. Additionally, Gore-Sorber reported results of other organic compounds which are part of their standard reporting package. Detected compounds included methyl tertiary-butyl ether (MTBE), 2-methyl naphthalene, chlorobenzene, carbon
tetrachloride and BTEX. 
 Due to the detection of TCE and 1,1,1-TCA and BTEX, SAIC recommended additional studies within the building to determine
concentrations of the analytes and their risk to human health. An additional air study performed by SAIC in 1999 for Building 566 using air canisters, indicated that the building was not suitable for use as a child care center. 

 

	3.5.15	Asbestos 

 A limited asbestos survey of the housing units was conducted by the Navy in 1988, and a
basewide survey was conducted by Tetra Tech in 1993 (Tetra Tech, 1994b). The surveys identified both confirmed and suspect asbestos containing materials (ACMs) including pipe lagging, floor and ceiling tile, mastic, sheetrock and tape mud,
water lines and gasket material. Results of the survey identified multiple buildings with confirmed and suspect asbestos present within the NRP. Table 6 presents a summary of the buildings with confirmed and suspect asbestos. In addition, some
buildings at Moffett Field were also sampled as a result of modifications being performed. Table 6 also presents a summary of the buildings that were sampled and their sample dates, and identifies which sampled buildings detected ACM. A discussion
of these results for Parcel 5 is presented in Section 4.0. 
 Asbestos surveys and sampling, shall be conducted by NASA at the Partners expense if
necessary, prior to demolition, rehabilitation, or occupancy of any buildings within the parcel (Personal Communication, 2000b). 
  

	3.5.16	Pesticides 

 Normal use of pesticides, herbicides, and fertilizers has occurred, however the extent and
types used is unknown. Therefore, there is the potential for residual levels of pesticides in soil and groundwater within the NRP. No pesticide mixing areas were known to be present within the NRP parcels. The presence of pesticides is not discussed
further in this document. 

  
 24 

	3.5.17	Polychlorinated Biphenyls 

 The NASA Environmental Services Office performs quarterly inspections,
completes Annual Document Logs, and submits transformer registration of equipment with concentrations of polychlorinated biphhenyls (PCBs) at greater than or equal to 50 ppm in compliance with 40 CFR 761 to the U.S. EPA. In addition, the NASA
Facilities Maintenance group completes additional inventories, inspections and testing of the equipment. Historical documentation includes a PCB inventory of the former Naval Air Station, at Moffett Field conducted by the Navy in 1993 (NAS
Moffett Field, 1993). In this document, a total of 252 items were identified and sampled, including capacitors, regulators, oil fuse cutouts, oil circuit breakers, oil switches, and transformers. PCB concentrations ranged from non-detect to
542,000 ppm. Since the completion of this 1993 report, many pieces of equipment have been removed and disposed of as indicated in the PCB Annual Document Logs. 

Transformers or capacitors with PCB concentrations above the California DHS regulated concentration (5 ppm) for hazardous waste are present within the NRP.
Four of these transformers are included because they have not been tested for PCBs and in compliance with 40 CFR 761 are assumed to have concentrations of PCBs >500 ppm. However, since these items are inspected regularly and PCB releases have not
been observed these items are not considered an environmental concern. Table 7 presents a summary of the buildings with transformers and/or capacitors with concentrations of detected PCBs above the DHS regulated concentrations. Equipment with PCB
concentrations of 5 ppm or greater present in Parcel 5 is discussed in Section 4.0. Any buildings with fluorescent lighting may contain PCB light ballasts. These must be removed and disposed of properly prior to demolition. 

 

	3.5.18	Ordnance 

 There is no evidence that ordnance was used or stored within the NRP parcels (Tetra Tech,
1994a). Several high explosive magazines, an ordnance shop, and a missile magazine are located on the northeast side of Moffett Field several thousand feet from the parcel. Ordnance is not discussed further in this document. 

 

	3.5.19	Mold 

 On September 14, 2000, in preparation for a visitor tour scheduled for buildings in Parcel I,
PAI/ISSI conducted hazard reviews of Buildings 20 through 27. Results of the review identified substantial visual molds in Buildings 20, 23, and 25. Laboratory analysis of molds observed in Building 25 during a previous visit indicated that a number
of different mold types including aspergillus, penicillium and stachybotrys were present within this building. Deleterious health effects can be produced by mold species, including infectious disease, allergenic response, irritation and dermatitis.
Because of the mold hazard, NASA issued a memorandum dated September 22, 2000, detailing precautions which need to be taken prior to entering buildings with molds present, specifically Building 2.Sm: (NASA, 2000b). No mold has been
investigated or identified in Parcel 5. 

  
 25 

	3.6	Closure Plans 

 A Closure Plan (CP) was prepared for NASA (PAI/ISSI, 2000), which describes the
requirements and procedures for the demolition of several buildings and associated structures within Parcel 5. The CP also outlines the environmental requirements for rebuilding these facilities. Closure Plan I includes Buildings 111,
146/146A, 161, 574, 958, and 992. In addition, the CP covers the removal of the underground storage tanks 431 and 432 (also known as Tanks 70 and 71). Closure Plan 2 includes Buildings 50, 148, 149, 150, 151, 555, 583A, 583B, 590, 964 and 965.
Closure Plan 3 will include Buildings 82, 459, 512A, 512B, 512C, 534, 547B, 547C, 547D, 547E, 572, 583, 945, 966 and 967. It will be completed by February 1, 2001. Closure Plan 4 will include Buildings 184, 343, 544, 585, 950 and 951. It will
be completed by March 15, 2001. The CP includes descriptions of the facilities and hazardous materials handling and storage. In addition, infrastructures that may contain hazardous materials (e.g. PCBs in electrical equipment) are also
identified. A description of the procedures to protect and/or destroy groundwater monitoring wells and treatment system equipment are also included. 

  
 26 

 4.0 FINDINGS FOR PARCEL 5 

This section provides a summary of data collected at Parcel 5 of the NRP, which is designated for reuse as a collaborative research and educational campus.
The findings pertaining to this parcel describe past and current environmental restoration and compliance program activities. A discussion of potential environmental constraints is also provided. 

 

	4.1	History and Current Usage 

 The majority of the buildings on Parcel 5 were constructed between the mid
1940s and the mid 1980s. No buildings were identified on the National Register. Historic use of the buildings was varied and included recreation, barracks, retail and training. Table 8 presents a list of buildings and summarizes the following: 

 

	•	 	Historic use 

  

	•	 	Building Area 

  

	•	 	Year Constructed 

  

	•	 	Presence on National Register 

  

	•	 	Current occupant and use if known 

  

	•	 	Preferred development alternative. 

 The buildings are currently used for office and training space, motor pool
operations, storage, retail, and recreation or are vacant. Utilities present on Parcel 5 include fresh water, sanitary sewer, telephone, storm drain, power and steam lines and compressed air. (Plates 6a and 6b). 

 

	4.2	Environmental Restoration Programs 

 Parcel 5 includes all or portions of five Sites (10, 14, 15, 16 and
18) and is underlain by the West Side Aquifer. Sites 10, 14, 15, 16 and 18 are discussed below; the West Side Aquifer OU was discussed above in Section 3.4.2. The chemicals detected in the groundwater below Parcel 5 are generally above MCLs for
VOCs (Locus 1999, Tetra Tech, 1999b). See Appendix B for a recent plume map. 
 Seventy-five groundwater monitoring and 8 extraction wells lie on
Parcel 5 (Table 9 and Plate 4). The monitoring and extraction wells monitor and remove the Westside groundwater contamination plume. 

  
 27 

	4.2.1	Site 10 

 Site 10 includes the Chase Park Area and the Moffett Field runways. Only the Chase Park Area is
located within the NRP. Chase Park is a recreation area that includes ball fields and a running track. No contamination sources have been identified in the Chase Park Area, but the underlying groundwater is contaminated with volatile organic
compounds from the West Side Aquifer groundwater contamination plume ( Tetra Tech, 1998b). A discussion of the groundwater can be found in Section 3.4.2, no further action decision has been reached for Site 10 ( USEPA, 1993). 

 

	4.2.2	Site 14 

 Site 14-North (former USTs 67 and 68) is part of OU2-west and is located near Building 88
(former dry cleaning building). The dry cleaning building was investigated as part of the investigation of Site 18 (Section 4.2.5). Tank 67 contained fuel oil and was removed in May 1990. Tank 68 contained solvents and was removed in July 1994
during the Building 88 remedial action. Investigations performed at both tank locations did not identify contamination related to the operation of USTs 67 and 68 (Tetra Tech, 1998b and PRC, 1997). 

Site 14-south is at an operating vehicle fueling station. Leakage from two removed tanks (Tanks 19 and 20) and piping appears to have contributed to soil and
groundwater contamination. A groundwater pump and treat system was previously operated at this site, although low-permeability soils limited flow rates and this approach was abandoned. A recirculating in situ treatment system was designed and
installed at Site 14-south in 1995 to replace the pump and treat system (PRC, 1997). This system was operated until 1998, when it was turned off to allow natural attenuation to occur. Current benzene concentrations in the groundwater are
3,000 μgll. The current double-walled tanks were installed in 1986, and upgraded in 1998. The requirements for removal of the contaminated soil associated with Tank 19 and 20 are outlined in the CP (PAii/SS/, 2000). 

 

	4.2.3	Site 15 

 Site 15 includes eight sumps and oil/water separators and one tank located throughout Moffett
Field. Four of the sumps are not located on the NRP parcels and are not covered in this EBS; three sumps and oil/water separators (25, 42, and 58) are located on Parcel 5. Tank 25 includes an oil/water separator. The separator collected wastewater
generated by aircraft washing activities south of Hangar 1 and has been removed. No evidence of a release was identified in the investigation at oil/water separator 25 (PRC, 1993); however, low concentrations of VOCs were detected in
groundwater below this area (Tetra Tech, 1998b). Sump 42 collected condensed gasoline vapor and was located at the new NEX service station and was removed in October 1990. Low levels of TPH and BTEX were detected in soil samples collected
from below the sump; however, no further action for the sump was recommended. Tank 58 is an oil/water separator that received drainage from the work areas and wash water from the wash rack at the hobby shop (Building 544). The wastewater was
discharged from the separator to the sanitary sewer. The tank was removed in 1994. Analytical results available for soil surrounding Tank 58 show BTEX present above cleanup levels. The requirements for removal of the contaminated soil associated
with Tank 58 are outlined in the CP (PAI/ISSI, 2000). 

  
 28 

	4.3.4	Site 16 

 Site 16 is a public works steam-cleaning Sump (Tank 60) which included two catch basins that
drained a concrete wash pad to an underground oil/water separator. Data for this site were collected during the sump removal and contamination was noted during removal (PRC, 1997). A no further action decision has been reached for Site 16
(USEPA, 1993). However, TCE has been detected in the groundwater at this location at 250 ppb. The CP discussed the requirements for removal of potentially contaminated soil associated with Tank 60 (PAI/ISSI, 2000). 

 

	4.3.5	Site 18 

 Site 18 includes Sump 66 on the northern side of former Building 88 (dry cleaners building).
Floor drains in Building 88 flowed into Sump 66, which was removed in 1990 (PRC, 1996). Sample data did not indicate contamination from the sump. A remedial action, however, was conducted during 1994 and 1995 to address potential
contamination from the Building 88 floor drains. The building, foundation, underground piping, and Tank 68 and Sump 91 (also located on the northern side of Building 88) were demolished and removed. Approximately 400 cubic yards of soils
contaminated with cleaning solvents were excavated and treated. Remediation of VOC impacted soil is complete and no further contamination remains (PRC, I997). This VOC contamination has most likely contributed to the regional VOC plume. 

 

	4.3	Environmental Compliance Programs 

  

	4.3.1	Hazardous Waste Management 

 On the basis of the review of the documents discussed above in
Section 3.5.1, ten buildings (Tables 10 & 11, Buildings 88, 113, 146/146a, 503, 525, 529, 950, 958, 992) historically (prior to 1994) accumulated hazardous wastes. Hazardous waste is currently (1994 to present) accumulated at ten
buildings (111, 146, 152, 156, 529, 543, 544, 583, 944, and 950). A list of the hazardous wastes previously and currently generated in buildings within Parcel 5 is presented in Tables 10 and 11, respectively. 

 

	4.3.2	Hazardous Materials Management 

 Hazardous materials were historically stored or used at fifteen
buildings within Parcel 5 (Boeing, 1993b,- SEC Donahue Inc., 1993). Hazardous materials are currently stored or used at eight buildings. Tables 10 and 11 list the hazardous materials formerly and currently
stored or used in Parcel 5, respectively. 
  

	4.3.3	Storage Tanks 

  

	4.3.3.1	Underground Storage Tanks, Oil/Water Separators and Sumps 

 Twenty-eight USTs, four oil/water separators,
two active (Tanks 431 and 432 [also known as Tanks 70 and 71]), and seven sumps are or were present within Parcel 5. The USTs, oil/water separators, and sumps that have been present on Parcel 5 are identified on Plate 5 and summarized on Table 3.
The majority of the USTs were discussed as part of the Site 14 (Tanks 19, 20, 67, 68), Site 15 (Tanks 25, 42, and 58), Site 16 (Tank 60) and Site 18 (Sump 66) 

  
 29 

 
investigations (in Sections 4.2.2, 4.2.3 and 4.3.5 respectively). Tanks 33 through 42 are associated with the Navy Exchange Service Station Investigation, at Building 503. The NEX Site is a
gasoline dispensing facility. It contained eight USTs that stored gasoline, a waste oil UST and a vapor recovery sump. All tanks were removed between 1990 and 1994. Dissolved phase gasoline and BTEX were identified in the soil near the former UST
areas. No further action for this site was anticipated ( Tetra Tech, I 998b). Tank 89 was removed in 1994 by the Navy. Associated soil samples showed concentrations of total petroleum hydrocarbons above cleanup goals. The requirements for
removal of contaminated soil associated with Tank 89 are presented in the CP ( PAI/ISSI, 2000). Tanks 4, 51, and 113 have no records of being investigated and no record of decisions associated with these tanks are available. Tanks 25, 4lb,
57, 57a, 58, 91, 126, 127 and 136 are still being investigated or monitored. Tanks 86a, 86b, 110 and 116 were granted closure by the RWQCB August 8, 2000. Procedures for removing Tanks 431 and 432 and associated soil sampling are outlined in
the CP (PAI/ISSI, 2000). 
  

	4.3.3.2	Aboveground Storage Tanks 

 Seven active ASTs are present within Parcel 5 and four have been removed. The
active ASTs are lubricant waste oil and gasoline ASTs associated with the active Navy Exchange service station, and a sodium hypochlorite tank associated with Building 104. The ASTs are identified on Plate 5 and summarized on Table 4. On the basis
of the size of the active tanks, or because leak detection systems have not detected any releases, they are unlikely to have impacted the environment; however, no documentation exists nor was a visual survey conducted to support this conclusion.

  

	4.3.4	Lead-Based Paint 

 Based on the age of the buildings/structures present within Parcel 5 it is assumed
that 49 of the 62 buildings/structures contain lead. Review of PAI internal files identified three buildings within Parcel 5 that have been sampled as a result of modifications being performed; all three of the buildings sampled detected lead. Table
5 presents a summary of buildings that were sampled, their construction and sample dates, and identifies which buildings showed detected LBP. 
 Surface
soil samples were collected from the perimeter of 29 buildings within Parcel 5. Lead was detected above the Region 9 residential PRG at two of the building locations and above the industrial PRG at our building location. Table 5 presents a summary
of the building perimeters sampled within Parcel 5. 
  

	4.3.5	Air Quality 

 Two emission sources are located within Parcel 5. The first source is the gasoline ASTs
associated with the NEX fuel Station (Building 503). The second source is the USTs associated with Building 161. All sources are properly permitted by the Bay Area Air Quality Management District. 

Five of the buildings tested as part of the indoor air quality investigations discussed in Section 3.5.11.2 (Buildings 111, 148, 156, 476, and 543) are
located within Parcel 5. No chemicals were detected above the respective OSHA PEL or ACGIH TLB-TWA thresholds, which suggests that VOC infiltration from the regional groundwater plume is unlikely to pose a hazard to onsite

  
 30 

 
workers. Benzene, 1,4-dioxane, 1,4-dichlorobenzene and 1,2-dichlorethane were detected above adjusted PRGs for a residential scenario, indicating that VOC infiltration may be an issue for any
residential development. No studies have been conducted to evaluate the potential exposure to construction workers if any, from inhalation of VOC vapors associated with the regional groundwater plume. Any construction work involving soil disturbance
shall be performed by appropriately trained workers under a Health and Safety Plan which addresses appropriate monitoring and personal protective equipment. Workers in the subsurface environment must have 24-hour hazardous waste site training. 

 

	4.3.6	Asbestos 

 Results of the surveys and sampling discussed in Section 3.5.12 identified 34 buildings
within Parcel 5 with confirmed or suspect asbestos present (Table 8). All remaining buildings were not sampled and with the exception of five of the buildings constructed in the mid-1980s, all are assumed to contain ACM. 

 

	4.3.7	Polychlorinated Biphenyls 

 Seven buildings within Parcel 5 contain transformers or capacitors with PCB
concentrations above the DHS regulated concentration (5 ppm). In addition, one capacitor located at Building 476 has not been tested and is assumed to contain at least 500 ppm PCBs per 40 CPR 761. Table 7 presents a summary of the Parcel 5 buildings
with PCB containing items, their sample dates, and the concentrations of detected PCBs above the DTSC regulated concentration. Because no leaks of these active units have been observed during inspections, they are unlikely to have impacted the
environment. Quarterly inspections are recorded on Field Sheets kept electronically on a database and reported annually in the PCB Annual Document Log. A visual survey was not conducted as part of this report. Any buildings with fluorescent lights
may contain PCB light ballast. These must be removed and disposed of properly prior to demolition. 
  

	4.4	Discussion of Findings 

 The potential environmental constraints for Parcel 5 include the following: 

 

	•	 	Concentrations of VOCs in the groundwater beneath Parcel 5 were detected above MCLs or cleanup goals. Volatilization of these VOCs may constrain any residential development, and shall require that any construction work
involving soil disturbance be performed by appropriately trained workers under purview of a Health and Safety Plan. 

  

	•	 	Several removed USTs and one removed AST are still actively being investigated. Regulatory status of these tanks should be further researched. The active USTs and ASTs should be inspected to document their conformance
with current regulatory guidelines. 

  

	•	 	NASA is currently working on the preparation of closure plans which will include visual surveys and a documentation of any hazardous materials or wastes that are present and, if present, if they have impacted the
environment. 

  

	•	 	 Lead-based paint and asbestos containing materials have been identified or are suspected in the majority of the
buildings within Parcel 5. In addition, LBP has been identified in the soil 

  
 31 

 
associated with many of the buildings. The presence of these materials should be confirmed and remediated prior to demolition, renovation, or reuse of the building. LBP and asbestos surveys
should be conducted prior to commencing demolition, renovation, or reuse activities. 

  
 32 

 5.0 BIBLIOGRAPHY 

Boeing Aerospace Operations, Inc. (Boeing), 1993a. Position Paper 148-156. January 22 

            , 1993b. Report of Findings, Phase I Building Assessment Building 45.
April 
 Brady and Associates, Inc. 1994. Final Environmental Assessment, Moffett Field Comprehensive Use Plan, Moffett Field, California.
August 
 Chemical Waste Management Inc., 1993a. Draft Preliminary Site Assessment, Hangar 1, Buildings 32, 33, 83, 118, 119, 120, 347, and 584, Naval
Air Station, Moffett Field, California. February 1 
             , 1993b.
Draft Preliminary Site Assessment, Area 8, Buildings I A, 105, 249, 256A, 329, 331, 400. May 17 

            , 1993c. Phase I Environmental Site Assessment Area 4, Buildings 77, 449,
and 454. June 1 
             , 1993d. Phase I Environmental Assessment,
Building 567 Public Works Warehouse, Naval Air Station Moffett Field, California. August 25 

            , 1993e. Surface Soil Lead Survey, Naval Air Station, Moffett Field
California. October 29 
             , 1994. Naval Weapons Bunkers and Laboratory
Declassification Survey, NASA Ames Research Center. January 12 
 Chou, Joseph, Regional Water Quality Control Board, San Francisco Bay Region, 2000.
Personal communication - telephone. Conversation regarding USB and comments and draft EBS. October 4 
 Department of the Anny (Anny), Headquarters
124th U.S. Anny Reserve Command, 1994. Memorandums discussing Radon Survey Results to USAR Aviation Support Facility 27 and to 3rd BN, 12th Special Forces Group. July 8 

Harding ESE, Inc. (Harding ESE, formerly Harding Lawson Associates), 1988. Remedial Investigation Report, Middlefield -Ellis-Whisman Area, Mountain
View, California 
              2000. Draft Air Quality Investigation, 476 and 543, Ames
Research Center. July 14 
 ICF-Clement, 1988. Endangerment Assessment for the Middlefield-Ellis-Whisman Site, Mountain View, California, June 15.

 Insituform Technologies, Inc. 1997a. BAMSI, Inc. Solicitation #MSSC-C-96-026, Sewer Rehabilitation, Moffett Field, California January 

  
 33 

             , 1997b. DMJM Engineers, NASA
Ames Research Center, Repair Sanitary Sewer System, Moffett Field, California. May 
 IT Corporation, 1993. Operable Unit 2 Remedial Investigation
Report, Naval Air Station Moffett Field, California Vol. 1. May 
 Iwamura, T.I., 1980. Saltwater Intrusion in the Santa Clara Valley Bay/ands Area,
California. Santa Clara Valley Water District. September 
 Locus Technologies, 1999. Remedial Action Report Regional Ground Water Remediation
Program Middlefield-Ellis-Whisman Site Mountain View, California. December 
 NASA -ARC, 1989. Memorandum to Steve Brisbin from NWT presenting Radon
Survey results for period between 12/27/88 and 1/02/89. February 9 
 Naval Air Station Moffett fiel•.Public Works Environmental Division
(NAS Moffett Field), 1990. Hazard Communication Plan for NAS Moffett Field 

            ,1991a. Hazardous Substance Spill Contingency Plan, Naval Air Station,
Moffett Field CA. January 
             , 1991b. Hazardous Waste Management Plan,
Naval Air Station, Moffett Field CA. April 
             , 1991c. Oil Spill
Prevention, Control, and Countermeasues Plan, Naval Air Station, Moffett Field CA. April 

            , 1993. Draft PCB Survey, Naval Air Station, Moffett Field CA. November

 Naval Energy and Environmental Support Activity (NEESA, Port Hueneme), 1984. Initial Assessment Study of Naval Air Stations, Moffett Field,
California. March 
             , 1989. Hazardous Waste Minimization Plan for Naval
Air Station, Moffett Field CA. October 
             , 1991. Solid Waste
Management Plan (SWMP) for Naval Air Station, Moffett Field, CA. September 
 NASA, 1998. Environmental Self Assessment Report of Findings and
Corrective Actions Order. 
             , 2000. Internal documents. Various air
permits and emission Source Inventory. 
             , 2000b. NASA. Internal Memorandum.
Hazard Notification, Building 25 from Stanleigh Phillips, CIH. September 22. 
 Olliges, Sandy, NASA Project Manager, 2000b E-mail regarding
asbestos sampling and other related activities. August 30 
 PAI/ISSI Team, 2000, Closure Plan, Buildings 111, 146, 161, 574, 958, and 992, NASA
Ames Research Center, Moffett Field, California. November 

  
 34 

             , 2000, Closure Plan,
Buildings 50, 148, 149, 150, 151, 555, 583A, 583B, 590, 964 and 965, NASA Ames Research Center Moffett Field, California. December 

PRC Environmental Management, Inc. (PRC), 1991. Site 9 Action Memorandum Volume 1, Naval Air Station Moffett Field, Mountain View, California.
July 3 
             , 1993. Final Installation Restoration Program
Petroleum Sites (And wastewater Tanks and Sumps) Characterization Report, for Naval Air Station, Moffett Field, California. October 1. 

            , 1994. Base Realignment and Closure Cleanup Plan, Naval Air Station
Moffett Field. March 
             , 1996. Final Station-Wide
Remedial Investigation Report, Moffett Federal Airfield, California. May 

            , 1997. Base Realignment and Closure Business Plan (BCP) for Naval
Air Station, Moffett Field California. Prepared by PRC EMI. February 21 

            , and Montgomery Watson (MW), 1995. Final Phase I Site-wide
Ecological Assessment. Moffett Federal Airfield, California. September 

            , and Montgomery Watson (MW), 1997. Final Phase II Site-wide
Ecological Assessment, Moffett Federal Airfield, California. July 
 Regional Water Quality Control Board, 2000. Transmittal of the
Closure Letter and Site Summaries for Department of Defense (DOD) Underground Storage Tanks at Moffett Federal Airfield, California. August 8 

Science Applications International Corporation (SAIC), 1995. Environmental Multi-Media Audit Results for CANG, Moffett Federal Airfield. November 20

             , 1996. Hazardous Air Pollutant Emissions Inventory, NASA Ames
Research Center, Moffett Field California. July 18 
             , 1999a.
Passive Gas Monitoring Survey of Indoor Ambient Air and Subsurface Organic Vapors, Building 566. January 

            , 1999b. Ames Research Complex. 1998-1999 Annual Report for
Stormwater Discharges Associated with Industrial Activities, Volume 1. July 1 

            , 2000. Indoor Air Testing Report, Hangar 1 and Buildings 6, 21, 22,
26, 111, 148, 156, and 269 NASA Ames Research Center. July 18 
 SEC Donahue, Inc., 1993. Preliminary Site Assessment NAS Moffett
Field, Bldg, 146 and 146A, Santa Clara County, California. February 12 
 Tetra Tech EM Inc. (Tetra Tech), 1994a. Baseline
Environmental Report for Naval Air Station, Moffett Field, California - Administrative Draft. January 

  
 35 

             , 1994b. Asbestos Survey
at Naval Air Station, Moffett Field and NALF Crows Landing, California - Final Report. January 

            , 1998a. West-Site Aquifers Treatment System, Final Long Term
Groundwater Monitoring Plan. January 20 
             , 1998b.
Final Basewide Petroleum Site Evaluation Methodology Technical Memorandum. October 2 

            , 1998c. Final Station-Wide Feasibility Study Report. October
30 
             , 1999a. Remaining UST Sites Investigation, Field Work
Plan. Draft. February 15 
             , 1999b. November 1998,
Draft Quarterly Report, Moffett Federal Airfield, California. March 31 
 Unknown Source. Table and Summary presenting results of the NASA
Radon Monitoring Program and 543 Contract No. ARC860805. April 
 Uribe and Associates, 1993. Report of Findings Phase I Building
Assessments, Area 2, and Buildings 10 
 U.S. Department of Defense (DoD), 1994. Findings of Suitability to Transfer BRAC Property. June
1 
 U.S. EPA (USEPA), 1989. Record of Decision, Middlefield/Ellis/Whisman Study Area (MEW Site), Mountain View, California. June 9

             , 1993. Letterfrom Mr. Michael Gill concurring with no
further action at Sites 10, 16, and 17. NAS Moffett Field, California. December 17 

            , 1998. Lead Based Paint Investigation Report for NASA Moffett Field.
October 
 Vermeere, Bill -PAI/ISSI, Radiological Specialist, 2000. Personal communication - telephone. Conversation regarding radioactive
materials. May 23 
 Western Ecological Services Company (WESCO), 1993. Phase I Site-Wide Qualitative Habitat and Receptor Characterization,
Naval Air Station. October 

  
 36 

 TABLES 

  
 37 

 Table 1. History of Installation Operations 

Environmental Baseline Survey 

NASA Research Park Parcels 

Moffett Federal Airfield, California 
  

 

 Table 1. History of Installation Operations 

Environmental Baseline Survey 

NASA Research Park Parcels 

Moffett Federal Airfield, California 
  

 

 

 Table 2. Installation Restoration Program Sites 

Environmental Baseline Survey 

Initial Development Parcel 5 

Moffett Federal Airfield, California 
  

 

 Table 3. Underground Storage Tank Status 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 Table 3. Underground Storage Tank Status 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 

 Table 4. Aboveground Storage Tank Status 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 Table 5. Lead Based Paint Sampling Results 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 Table 5. Lead Based Paint Sampling Results 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 

 Table 5. Lead Based Paint Sampling Results 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 

 Table 6. Asbestos Survey/Sampling Results 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 Table 6. Asbestos Survey/Sampling Results 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 

 Table 7. PCB Impacted Transformer/Capacitors 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 Table 8. Building List Summary 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 Table 8. Building List Summary 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 

 Table 9. Monitoring and Extraction Well Ownership and Total Depth 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 Table 9. Monitoring and Extraction Well Ownership and Total Depth 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 

 Table 10. Former (Prior to 1994) Hazardous Materials and Waste Locations 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 Table 10. Former (Prior to 1994) Hazardous Materials and Waste Locations 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 

 Table 11. Current (1994-2000) Hazardous Materials and Waste Locations 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 Table 11. Current (1994-2000) Hazardous Materials and Waste Locations 

Environmental Baseline Survey 

NASA Research Park Parcel 5 

Moffett Federal Airfield, California 
  

 

 

 PLATES 

 APPENDIX A 

PARCEL ENVIRONMENTAL SUMMARY REPORTS 

			
	Administrative Draft — For Discussion Purposes Only	  	Appendix A
		  	Parcel 5

 ENVIRONMENTAL SUMMARY REPORT 
  

 

			
	Administrative Draft — For Discussion Purposes Only	  	 Appendix A

Parcel 5

  

 

 

			
	Administrative Draft — For Discussion Purposes Only	  	 Appendix A

Parcel 5

  

 

 

			
	Administrative Draft — For Discussion Purposes Only	  	 Appendix A

Parcel 5

  

 

 

			
	Administrative Draft — For Discussion Purposes Only	  	 Appendix A

Parcel 5

  

 

 

			
	Administrative Draft — For Discussion Purposes Only	  	 Appendix A

Parcel 5

  

 

 

			
	Administrative Draft — For Discussion Purposes Only	  	 Appendix A

Parcel 5

  

 

 

 

 

 APPENDIX B 

PLUME AND ALLOCATION MAPS 

 

 

 

 

 

 

 APPENDIX C 

BURROWING OWL LOCATION MAP 

 

 

 

 

 APPENDIX D 

ARCHEOLOGICAL SENSITIVE AREAS 

 

 

 DISTRIBUTION 

Environmental Baseline Survey 
 NASA Research Park Parcel 5 

Moffett Federal Airfield 
 Moffett Field, California 

December 28, 2000 
  

			
	Copy No. 11	  	
		
	Copies 1-2:	  	 Sandy Olliges
 NASA Ames Research Center

MS 218-1
 Moffett Field, California 94035-1000

		
	Copy 3:	  	 Thomas H Anderson
 NASA/Ames Research
Center
 MS 19-21
 Moffett Field, California
94035-1000

		
	Copy 4:	  	 Joann Cola
 SFD-7-4

US Environmental Protection Agency
 75 Hawthorne Street

San Francisco, California 94105

		
	Copy 5:	  	 Roberta Blank- Superfund Division

SFD-8-2
 US Environmental Protection Agency

75 Hawthorne Street
 San Francisco, California 94105

		
	Copy 6:	  	 Joseph Chou
 California Regional Water
Quality Control Board
 1515 Clay Street
 Oakland, California
94612

 Harding ESE, Inc. 

 DISTRIBUTION 

Environmental Baseline Survey 
 NASA Research Park Parcel 5 

Moffett Federal Airfield 
 Moffett Field, California 

December 28, 2000 
  

			
	Copy 7:	  	 Andrea Maclormare
 BRAC -Environmental
Coordinator
 BRAC Operations, Code 06CM.MP
 1230 Columbia
Street
 Suite 1100
 San Diego, California 92101

		
	Copy 8:	  	 Jim Boarer
 Locus Technologies

299 Fairchild Drive
 Mountain View, California 94043

		
	Copies 9-11:	  	HLA Files
		
	Copy 12:	  	Corporate Copy

  

	
	Quality Control Reviewer
	
	  

	 James C. Davies
 Consulting
Principal

 Harding ESE, Inc. 

 CLOSURE PLAN NUMBER 5 

INCLUDING BUILDINGS: 

104, 107, 108, 109, 113, 476, 503, 525, 526, 529, 543, 554, 

556, 596, and 944 
 NASA
Ames Research Center 
 Moffett Field, California 
  

 
 

 
 Prepared By: 

PAI/ISSi TEAM 
 Mail Stop
19-21 
 Moffett Field, California 94035-1000 

Prepared for: 
 NASA
Ames Research Center 
 Environmental Services Office 

Mail Stop 218-1 
 Moffett
Field, California 94035-1000 
 June 2001 

 TABLE OF CONTENTS 

 

									
	 	 	 	  	 	  	Page	 
	 1.0
	 	Introduction	  	 	1	 
			
	 2.0
	 	Historical Operations	  	 	3	 
				
		 	 2.1
	  	 Former Building 88 - Site 18 (Navy Era)
	  	 	4	 
		 	 2.2
	  	 Building 104 (Navy Era)
	  	 	4	 
		 	 2.3
	  	 Building 107 (Navy Era)
	  	 	5	 
		 	 2.4
	  	 Building 108 (Navy Era)
	  	 	6	 
		 	 2.5
	  	 Building 109 (Navy Era)
	  	 	7	 
		 	 2.6
	  	 Building 113 (Navy Era)
	  	 	8	 
		 	 2.7
	  	 Building 476 (Navy Era)
	  	 	8	 
		 	 2.8
	  	 Building 503 (Navy Era)
	  	 	9	 
		 	 2.9
	  	 Building 525 (Navy Era)
	  	 	13	 
		 	 2.10
	  	 Building 526 (Navy Era)
	  	 	13	 
		 	 2.11
	  	 Building 529 (Navy Era)
	  	 	14	 
		 	 2.12
	  	 Building 543 (Navy Era)
	  	 	15	 
		 	 2.13
	  	 Building 554 (Navy Era)
	  	 	15	 
		 	 2.14
	  	 Building 556 (Navy Era)
	  	 	16	 
		 	 2.15
	  	 Building 585 (Navy Era)
	  	 	16	 
		 	 2.16
	  	 Building 596 (Navy Era)
	  	 	16	 
		 	 2.17
	  	 Building 944 (Navy Era)
	  	 	17	 
			
	 3.0
	 	Site Reconnaissance	  	 	18	 
			
	 4.0
	 	Current Operations	  	 	19	 
				
		 	 4.1
	  	 Building 104 (Post - Navy Era)
	  	 	19	 
		 	 4.2
	  	 Building 107 (Post - Navy Era)
	  	 	19	 
		 	 4.3
	  	 Building 108 (Post - Navy Era)
	  	 	19	 
		 	 4.4
	  	 Building 109 (Post - Navy Era)
	  	 	20	 
		 	 4.5
	  	 Building 113 (Post - Navy Era)
	  	 	20	 
		 	 4.6
	  	 Building 476 (Post - Navy Era)
	  	 	21	 
		 	 4.7
	  	 Building 503 (Post - Navy Era)
	  	 	21	 
		 	 4.8
	  	 Building 525 (Post - Navy Era)
	  	 	23	 
		 	 4.9
	  	 Building 526 (Post - Navy Era)
	  	 	23	 
		 	 4.10
	  	 Building 529 (Post - Navy Era)
	  	 	23	 
		 	 4.11
	  	 Building 543 (Post - Navy Era)
	  	 	24	 
		 	 4.12
	  	 Building 554 (Post - Navy Era)
	  	 	24	 
		 	 4.13
	  	 Building 556 (Post - Navy Era)
	  	 	24	 
		 	 4.14
	  	 Building 596 (Post - Navy Era)
	  	 	25	 
		 	 4.15
	  	 Building 944 (Post - Navy Era)
	  	 	25	 

  
 i 

 TABLE OF CONTENTS (cont’d) 

 

									
	 	 	 	  	 	  	Page	 
	 5.0
	 	 Existing Environmental Constraints
	  	 	26	 
				
		 	 5.1
	  	 Monitoring and Extraction Wells
	  	 	29	 
		 	 5.1.a
	  	 Groundwater Conditions
	  	 	30	 
		 	 5.2
	  	 Lead Sampling Study of Surface Soils
	  	 	31	 
		 	 5.2.a
	  	 Chemical Wste Management, INC. (CWMI) Surface Soil Lead Survey
	  	 	31	 
		 	 5.2.b
	  	 Weston Inc., Lead Based Paint Investigation Report for NAS Moffeff Field, EPA Region
IX
	  	 	33	 
		 	 5.3
	  	 MEW Regional Groundwater Remediation Program (RGRP) System
	  	 	34	 
		 	 5.4
	  	 Areas of Potential and Existing Contamination
	  	 	35	 
		 	 5.5
	  	 Removal of Areas of Existing Contamination
	  	 	35	 
		 	 5.5.a
	  	 Site 14
	  	 	36	 
		 	 5.5.b
	  	 Site 15
	  	 	36	 
		 	 5.5.c
	  	 Site 18
	  	 	36	 
		 	 5.5.d
	  	 Building 104
	  	 	36	 
		 	 5.5.e
	  	 Building 107
	  	 	36	 
		 	 5.5.f
	  	 Building 503
	  	 	37	 
		 	 5.5.g
	  	 Building 525
	  	 	37	 
		 	 5.5.h
	  	 Building 529
	  	 	37	 
		 	 5.5.i
	  	 Building 543
	  	 	37	 
		 	 5.5.j
	  	 Building 556
	  	 	38	 
		 	 5.6
	  	 Facility Sampling and Analysis
	  	 	38	 
		 	 5.6.a
	  	 Site 14
	  	 	38	 
		 	 5.6.b
	  	 Site 15
	  	 	38	 
		 	 5.5.c
	  	 Site 18
	  	 	39	 
		 	 5.6.d
	  	 Building 104
	  	 	39	 
		 	 5.6.e
	  	 Building 107
	  	 	39	 
		 	 5.6.f
	  	 Building 503
	  	 	39	 
		 	 5.6.g
	  	 Building 525
	  	 	39	 
		 	 5.6.h
	  	 Building 529
	  	 	39	 
		 	 5.6.i
	  	 Building 543
	  	 	39	 
		 	 5.6.j
	  	 Building 556
	  	 	39	 
			
	 6.0
	 	 Facility Closure Procedures
	  	 	40	 
				
		 	 6.1
	  	 Santa Clara County Requirements
	  	 	40	 
		 	 6.1.a
	  	 Hazardous Materials Storage Closure
	  	 	40	 
		 	 6.2
	  	 Air Pollution Control Requirements Associated w/Site Closure
	  	 	40	 
		 	 6.3
	  	 Industrial Wastewater Requirements Associated w/Site Closure
	  	 	40	 
		 	 6.4
	  	 Polychlorinated Biphenyls (PCB)
	  	 	41	 
		 	 6.5
	  	 Burrowing Owls
	  	 	41	 
		 	 6.6
	  	 Storm Water Management during Site Closure
	  	 	42	 
		 	 6.6.a
	  	 The Navy Era’s Former Illicit Connection Program
	  	 	42	 

  
 ii 

 TABLE OF CONTENTS (cont’d) 

 

									
	 	 	 	  	 	  	Page	 
		 	 6.6.b
	  	 Best Management Practices
	  	 	42	 
		 	 6.6.c
	  	 Ames’ Storm Water Pollution Prevention Plan (SWPPP)
	  	 	43	 
		 	 6.6.d
	  	 New NPDES Requirements for Construction
	  	 	43	 
		 	 6.7
	  	 Spill Prevention Control and Countermeasures (SPCC)
	  	 	44	 
		 	 6.8
	  	 National Historic Preservation Act
	  	 	44	 
			
	 7.0
	 	 Future Environmental Constraints
	  	 	44	 
				
		 	 7.1
	  	 Monitoring and Extraction Wells
	  	 	45	 
		 	 7.2
	  	 MEW Regional Groundwater Remediation Program (RGRP) System
	  	 	45	 
		 	 7.3
	  	 Areas of Potential and Existing Contamination
	  	 	46	 
			
	 8.0
	 	 Environmental Requirements for Facility Construction
	  	 	46	 
				
		 	 8.1
	  	 Hazardous Materials Storage Installation
	  	 	46	 
		 	 8.1.a
	  	 Tank Installation Requirements
	  	 	47	 
		 	 8.2
	  	 Air Pollution Control Installation
	  	 	47	 
		 	 8.3
	  	 Industrial Wastewater Requirements Associate w/Site Installation
	  	 	48	 
		 	 8.4
	  	 Borrowing Owl Requirements Associated with Site Installation
	  	 	48	 
		 	 8.5
	  	 Storm Water Management Requirements Associated with Site Installation
	  	 	48	 
		 	 8.6
	  	 Spill Prevention Control and Countermeasures (SPCC) Associated with Site Installation
	  	 	49	 
		 	 8.7
	  	 Archeological Resources
	  	 	49	 
		 	 8.8
	  	 Unexpected Discovery Plan
	  	 	49	 

 LIST OF TABLES 
  

					
	 Table 1 Building Occupants
	  	 	3	 
		
	 Table 2 Underground Storage Tanks Previously at Building 503
	  	 	10	 
		
	 Table 3 1984 HMIS for Building 503
	  	 	12	 
		
	 Table 4 Equipment List
	  	 	18	 
		
	 Table 5 Groundwater Monitoring and Extraction Wells
	  	 	29	 
		
	 Table 6 Monitoring Well COC’s
	  	 	31	 
		
	 Table 7 Lead Concentration and Recommendations (CWMI Survey)
	  	 	32	 
		
	 Table 8 Results from XRF Lead Based Paint Survey of Structures
	  	 	34	 
		
	 Table 9 Predicted Laboratory Lead Concentrations
	  	 	34	 
		
	 Table 10 Surface Sampling at Buildings 104, 525, 529, 543, and 556
	  	 	38	 

  
 iii 

 TABLE OF CONTENTS (cont’d) 

 

 LIST OF APPENDICES 

 

			
	 Appendix A
	  	 Fact Sheet - NASA Ames Development Plan

		
	 Appendix B
	  	 Santa Clara County Storage Permits and Inspection Reports, Navy Era

		
	 Appendix C
	  	 BIER Reports

		
	 Appendix D
	  	 Historic Photographs, Navy Era

		
	 Appendix E
	  	 Current Photographs, Post Navy Era

		
	 Appendix F
	  	 Santa Clara County Permits and Inspections, Post Navy Era

		
	 Appendix G
	  	 Santa Clara County Facility Closure Guidelines

		
	 Appendix H
	  	 Table A-1 Identified Illicit Discharges, Discharges Requiring Additional Investigation and
Potable Water Discharges

		
	 Appendix I
	  	 Storm Water Best Management Practices

		
	 Appendix J
	  	 Department of Parks and Recreation (DPR) 523 Forms

		
	 Appendix K
	  	 Santa Clara County Permit Applications

		
	 Appendix L
	  	 Santa Clara County Underground/Aboveground Storage Installation Guidelines

 LIST OF FIGURES 
  

			
	 Figure 1
	  	 Site Map

		
	 Figure 2
	  	 Proposed Land Use Plan

		
	 Figure 3
	  	 Proposed Land Use Plan

		
	 Figure 4
	  	 Monitoring and Extraction Wells

		
	 Figure 5
	  	 Proposed Soil Sample Locations

		
	 Figure 6
	  	 Borrowing Owl Locations

		
	 Figure 7
	  	 Shenandoah Plaza Historic District

		
	 Figure 8
	  	 Archeological Sensitive Areas

  
 iv 

 TABLE OF CONTENTS (cont’d) 

 

 LIST OF ACRONYMS 

 

			
	 Ames
	  	 NASA Ames Research Center

	 BAAQMD
	  	 Bay Area Air Quality Management District

	 bgs
	  	 below ground surface

	 BTEX
	  	 Benzene, Toluene, Ethylbenzene and Xylenes

	 CANG
	  	 California Air National Guard

	 CERCLA
	  	 Comprehensive Environmental Response Compensation and Liability Act

	 CFC
	  	 Chlorofluorocarbon

	 CLEAN
	  	 Comprehensive Long-Term Environmental Action Navy

	 CUP
	  	 Moffett Field Comprehensive Use Plan

	 DCE
	  	 Dichloroethene

	 DPR
	  	 Department of Parks and Recreation

	 EA
	  	 Environmental Assessment

	 EOD
	  	 87th Explosive Ordnance Division

	 EPA
	  	 Environmental Protection Agency

	 IS
	  	 Invisible Studios

	 MEW
	  	 Middlefield-Ellis-Whisman

	 Mg/kg
	  	 Milligrams per kilogram

	 Mg/1
	  	 Milligrams per liter

	 MTBE
	  	 Methyl Tert-Butyl Ether

	 NEPA
	  	 National Environmental Policy Act

	 NRP
	  	 NASA Research Park

	 OSHA
	  	 Occupational Safety and Health Administration

	 PCB
	  	 Polychlorinated Biphenyl

	 POTW
	  	 Publicly Owned Treatment Works

	 PP
	  	 Priority Pollutant

	 ppm
	  	 parts per million

	 PRG
	  	 Preliminary Remediation Goal

	 R&D
	  	 Research and Development

	 RGRP
	  	 Regional Groundwater Remediation Program

	 RWQCB
	  	 Regional Water Quality Control Board

	 RIST
	  	 Recirculating In-Situ Treatment System

	 SCVWD
	  	 Santa Clara Valley Water District

	 SPCC
	  	 Spill Prevention Control and Countermeasures

	 SWPP
	  	 Storm Water Pollution Prevention

	 SVOC
	  	 Semi Volatile Organic Compound

	 TCE
	  	 Trichloroethylene

	 TOG
	  	 Total Oil and Grease

	 TPHg
	  	 Total Petroleum Hydrocarbons as gasoline

	 TPHjp5
	  	 Total Petroleum Hydrocarbons as JP5

	 TPHmo
	  	 Total Petroleum Hydrocarbons as motor oil

	 UST
	  	 Underground Storage Tank

	 VOC
	  	 Volatile Organic Compound

  
 v 

	1.0	INTRODUCTION 

 This closure plan describes procedures to ensure that the Buildings 104, 107, 108, 109,
113, 476, 503, 525, 526, 529, 543, 554, 556, 596, and 944 will be closed in a manner protective of human health and the environment. These buildings are referred to as the site for the purposes of this plan. The primary objective of this plan is the
identification of actions to be taken prior to building closure. The site will be redeveloped as a result of the proposed University Reserve in the proposed NASA Research Park. (See Figure 1). 

This plan specifically addresses the requirements and procedures for demolition of Buildings 104, 107, 108, 109, 113, 476, 503, 525, 526, 529, 543, 554, 556,
596, and 944 and other subsurface structures such as ground water monitoring and extraction wells. The plan also discusses some environmental requirements for the new construction associated with the University Reserve. See Figures 2 and 3
entitled “Proposed Land Use Plan”. The area depicted as the University Reserve includes the site addressed in this document, as well as other buildings and recreational areas that are evaluated in other plans. 

Ames is a federal facility located at Moffett Field, California. Ames comprises 440 acres of the 1,857-acre Moffett Field site. Moffett Federal Airfield
(formerly Naval Air Station Moffett Field) and Army Corp of Engineering Housing occupy the remainder of Moffett Field. 
 This plan includes facility
descriptions and portrays hazardous materials handling operations. The environmental actions required for closure of facilities whose operations use and store hazardous materials have been highlighted. Hazardous materials storage areas are
identified. Equipment and facilities requiring closure procedures for storage areas, equipment, structures, and facilities prior to demolition are listed. 

A list of equipment associated with the hazardous materials handling operations such as air compressors, fume hoods, parts washers, degreasing units, paint
booths, refrigerant recycling equipment, blasting machines, and oil filter draining equipment are included in the plan. The plan lists equipment that may generate contamination such as motor vehicle and truck washing units when identified.
Additional surface and subsurface investigations are also described in the plan, if needed. 
 The plan also identifies infrastructure that may contain
hazardous materials such as chlorofluorocarbons in air conditioners and PCBs in electrical equipment. Subsurface and aboveground structures used to treat contaminated groundwater or industrial wastewater and oil water separators are also discussed
when present. 
 In 1991, the Federal Base Closure and Realignment Commission decided to close Moffett Field Naval Air Station. Subsequently, the U.S.
Department of Defense transferred stewardship of the property to NASA. NASA took over administration of Moffett Field in 1994 as a “Closed Federal Facility”. The reuse of Moffett Field was originally addressed in the Moffett Field
Comprehensive Use Plan (CUP) and its associated Environmental Assessment (EA), which resulted in a Finding of No Significant Impact in 1994. The CUP designated Moffett Field a shared use facility that would house Federal Agencies and their
contractors. Federal Agencies who have land use agreements with Ames at Moffett Field are referred to as Resident Agencies and include the California Air National Guard (CANG), the Army Reserves, and the Federal Emergency Management Agency. 

  
 1 

 NASA is currently planning to develop a world-class, shared-used educational and Research & Development
(R&D) campus focused on astrobiology, life sciences, space sciences, nanotechnology, biotechnology, information technology, and aeronautics. This project is referred to as the NASA Research Park (NRP). The NRP is one component of the proposed
NASA Ames Development Plan, which outlines planned development at Moffett Field in four areas: NRP, Ames Campus, Bay View, and Eastside/Airfield. Appendix A contains the “Fact Sheet” describing the Environmental Baseline Survey
(EBS) for Parcel 5. 
 As a result of the NRP, including the University Reserve, many existing facilities on Moffett Field will require demolition.
Buildings 104, 107, 108, 109, 113, 476, 503, 525, 526, 529, 543; 554, 556, 596, and 944 will all have to be demolished in order for this proposed project to go forward. 

This Closure Plan will be distributed to the Environmental Protection Agency (EPA), the Regional Water Quality Control Board (RWQCB), the Santa Clara County
Health Department, prospective NASA Partners, the Navy, and the Middlefield-Ellis-Whisman (MEW) companies since the site overlies the regional groundwater plume. 

Redevelopment activities could impact Navy Installation Restoration Program sites and groundwater monitoring wells, and the MEW Regional Groundwater
Remediation Program (RGRP), treatment system piping, groundwater extraction Wells, and groundwater monitoring wells. 

  
 2 

	2.0	HISTORICAL OPERATIONS 

 This section describes the historical use of the site. Historically the Navy
occupied the site. Table 1 reflects the historic and current building occupants. 
 TABLE 1 

BUILDING OCCUPANTS 
  

							
	 Building
	  	 Date Built
	  	 Historic Occupants
	  	 Current Occupant

	 104
	  	1943 / 90	  	Navy	  	NASA
	 107
	  	1948	  	Navy	  	Navy ROICC Office
	 108
	  	1980	  	Navy	  	Navy Exchange
	 109
	  	1948	  	Navy	  	Navy Exchange
	 113
	  	1944/1990	  	Navy Exchange	  	Navy Exchange
	 476
	  	1964	  	Navy Exchange	  	Navy Exchange
	 503
	  	1966	  	Navy Exchange	  	Navy Exchange
	 525
	  	1970	  	Navy Exchange	  	Onizuka
	 526
	  	1976	  	Navy Exchange	  	Onizuka
	 529
	  	1968	  	Navy Exchange	  	Navy Exchange
	 543
	  	1973	  	Navy	  	Onizuka
	 554
	  	1975	  	Navy Exchange	  	Navy Exchange
	 556
	  	1979	  	Credit Union	  	Credit Union
	 596
	  	1985	  	McDonalds	  	McDonalds
	 944
	  	1941	  	Navy●	  	Onizuka

 Several documents were reviewed to assess the historical presence of hazardous materials and potential pathways for surface
and subsurface contamination in and around Buildings 104, 107, 108, 109, 113, 476, 503, 525, 526, 529, 543, 554, 556, 596, and 944. These documents include: 
  

	•	 	The 50th Anniversary of NAS Moffett Field, published by Specialty Graphics, 1983. 

 

	•	 	Naval Energy and Environmental Support Activity (NEESA). 1984, “Initial Assessment Study of Naval Air Station, Moffett Field, California. March 

 

	•	 	Final Report Industrial Waste Engineering Study, Naval Air Station, Moffett Field, ERM-West/AQA Resources, April 1986. 

  

	•	 	NAS Moffett Field California, published by Specialty Graphics, 1984 and 1988. 

  

	•	 	Moffett Federal Airfield Building List, NASA Ames Research Center, January 1998. 

  

	•	 	BIER database reports — 1992 through 1994. 

  

	•	 	Naval Air Station Moffett Field, Storm Water Pollution Prevention Plan, PRC Environmental Management, Inc., 1992. 

  

	•	 	Draft Report of Findings, Phase 1 Site Assessments, Area 2, Chemical Waste Management, Inc., April 1993. 

  

	•	 	The Interim Operating Permits for NAS Moffett Field issued on 1 July 1993 and 15 January 1994 by the City of Sunnyvale. 

  

	•	 	City of Sunnyvale Industrial Wastewater Discharge Permit Application, NASA Ames Research Center, June 2000. 

  

	•	 	Naval Air Station Moffett Field, Surface Soil Lead Survey, CWMI, October 1993. 

  
 3 

	•	 	EPA Region IX Lead Based Paint Investigation Report For NAS Moffett Field, Roy F. Weston, Inc., October 1998 

  

	•	 	Building 45, 250 and 950 Phase II Site Assessment Naval Air Station Moffett Field, CA, Chemical Waste Management, Inc., May 1994. 

  

	•	 	Building 555 Assessment, including Buildings 107, 108, 109, 501, 555 and 566, Boeing Aerospace Operations, Inc., April 1994. 

A record search was conducted at the Santa Clara County of the Navy’s record using the privileges set forth in the “Freedom of Information
Act”. These records were reviewed for this plan and are included in this plan. Appendix B contains copies of the hazardous materials storage permits and other related documentation such as inspection results. 

Appendix C contains the Building Inventory Environmental Report (BIER) for the buildings that were inspected as part of the Moffett Development Project
in the 1992 to 1994 timeframe and include Buildings 104, 107, 108, 109, 113, 476, 503, 525, 526, 529, 543, 554, 556, 596, and 944. The BIER reports include summaries of inspections and summaries of recommendations made by staff of the Ames
Environmental Services Office and other Ames’ consultants. The historical sections of this plan are titled “Navy Era” to indicate the period of Navy operations prior to transfer to NASA. 

 

	2.1	Former Building 88 — Site 18 (Navy Era) 

 Before it was closed in 1987, Building 88 served as NAS
Moffett Field’s laundry and dry cleaning facility. This building and its associated features were demolished by the Navy in 1994 and were remediated. Site 18 is discussed in Section 5.5. 

 

	2.2	Building 104 (Navy Era) 

 Building 104 is a 200 square foot building constructed in 1943. The
construction type was classified as permanent. The building condition was considered standard and was constructed of concrete and wood. The Navy used this facility for operations/maintenance. The facility description is an impound lot for the 12 KVA
electrical distribution substation. The substation is located on a covered pad. This facility is enclosed in a fenced area. A small building in the fenced area houses batteries to activate switches in case of power outages. 

Ames Environmental Contractors’ Uribe & Associates (U&A) inspected Building 104 on 15 April 1993. Their inspection results are
documented in the Report of Findings, Phase 1 Building Assessments, Area 2.An excerpt of this report follows. 
 Building 104, an electrical distribution
substation built in 1943, has an area of approximately 2500 sq. ft. Electrical equipment is situated in a fenced yard. There are two structures; one is a workshop, the other is a battery room. (See Appendix D, Photograph 1). Construction is
concrete and steel; condition is reported to be standard. The subject site is located in Operable Unit 4 for groundwater. 

  
 4 

 This facility is a 12Kv substation and has four transformers; two are labeled as containing PCBs. There are also
three capacitors, two of which contain PCBs. (See Appendix D, Photograph 2). No leaks were observed. Acid containing lead batteries were stored as a backup power source. 

The soil and/or concrete beneath the transformers and capacitors should be sampled for PCBs. The battery storage room and workshop should also be sampled for
metals and semi-volatile organics. There is potential surface and subsurface contamination at this site that should be further evaluated. 
 Based on a
review of the Navy’s Industrial Wastewater permits, no industrial wastewater generating activities were conducted at Building 104 in either the 1993 or 1994 permits. A review of the Navy’s Industrial Waste Engineering Study’s Final
Report indicates no industrial wastewater generating activities were conducted at Building 104. 
 Records from the BAAQMD indicate there were no air
pollution sources associated with this building. 
  

	2.3	Building 107 (Navy Era) 

 Ames Environmental Contractors’ Boeing Aerospace Operations, Inc.
inspected Building 107 on 29 January 1993. Their results were documented in the Report of Findings, Building 555 Assessment including Buildings 107, 108, 109, 501, 555, and 566. An excerpt of this report follows. 

Review of Former Buildings 
 Building 107 was
constructed’ in 1948 and was designated as administrative for use by the Navy as Security Administration and for use by the ROICC. On 29 January 1993 the MFDP environmental staff assessed Building 107. No storage or use of hazardous
materials was associated with Building 107. 
 Based on conversations with Assistant Fire Chief Robert Eaton, Mr. Rick Cey of the Navy’s Safety
Office and John Shakelton of Moffett Field Public Affairs Office, Building 107 was originally used as a gasoline station. It is estimated that Building 107 served as a gasoline station from 1948 to the early 1950’s. Remnants of islands that
served as air and water dispensers were observed. These islands were located against the north side of Building 107 facing Wescoat Road. 
 There were
two 4,000 gallon underground storage tanks (USTs), Tanks 86A and 86B located on the west side of the building. The tanks were removed from the site in January 1993, under a permit issued by Santa Clara County, and the area had been covered with
soil. The installation date of the USTs #86A and #86B is unknown. Based on the type of tank construction (single walled steel), it is possible that the USTs were the original gasoline fueling station tanks from 1948. 

On 7 January 1993, four soil samples were collected and two water samples were collected from the excavation pit. The samples were received by Sequoia
Analytical on 8 January 1993 and analytical results reported on 19 January 1993. Analytical results from the soil samples collected 

  
 5 

 
during closure of tanks 86A and 86B reported non detect (ND) for Benzene, Toluene, Ethyl benzene and total Xylenes (BTEX) and purgeable hydrocarbons (total petroleum hydrocarbons as gasoline).
There were detectable concentrations of BTEX and purgeable hydrocarbons in the groundwater samples analyzed. The BTEX and purgeable hydrocarbons were reported in micrograms per liter (ug/L) as listed. The maximum contaminant levels (MCLs) are set by
the California and Environmental Protection Agency (EPA) and are the concentrations of chemicals that are not to be exceeded in water supplied to the public. The MCLs are also reported in ug/L for ease of comparison. 

 

							
	 Chemical Name
	  	Tank 86A	  	Tank 86B	  	 MCL

	 Benzene
	  	0.75	  	160	  	1.0
	 Toluene
	  	2.1	  	780	  	not available
	 Ethylbenzene
	  	ND	  	130	  	680
	 Xylene
	  	4.3	  	1400	  	1750
	 Purgeable hydrocarbons
	  	ND	  	7300	  	not available

 Analysis for lead concentrations in the water reported 1.7 milligrams per liter (mg/L) of lead at the tank 86A sample and 1.3
mg/L of lead at tank 86B sample. The amounts of lead detected exceeded the MCL of 0.05 mg/L and also exceeded the State of California’s Applied Action Levels (AAL) of 10 ug/L for freshwater species and 4 ug/L for saltwater species. The
AAL’s were developed based solely on health effects without consideration for technical feasibility or economic factors. 
 Based on a review of the
Navy’s Industrial Wastewater permits, no industrial wastewater generating activities were conducted at Building 107 in either the 1993 or 1994 permits. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicated
no industrial wastewater generating activities were conducted at Building 107. 
 Records from the BAAQMD indicate there were no air pollution sources
associated with this building. 
  

	2.4	Building 108 (Navy Era) 

 Ames’ Environmental Contractors Boeing Aerospace Operations, Inc.
inspected Building 108 on 29 January 1993. Their results were documented in the Report of Findings, Building 555 Assessment including Buildings 107, 108, 109, 501, 555, and 566. An excerpt of this report follows. 

Building 108 was the swimming pool. An aerial photograph review reveals that the swimming pool was built about 1956. 

Since 1956 the location and activities of the swimming pool and the Physical Conditioning/Dress Facility have essentially remained unchanged over the years.
Sometime during 1970, the swimming pool was enclosed in an inflatable dome cover. The swimming pool was uncovered in 1971, covered again in 1972, and the dome cover was finally removed in 1973. It is not apparent if chemicals were historically
stored on-site to maintain the swimming pool, and if so, the location of chemical storage is unknown. 

  
 6 

 The Navy corrected the illicit piping connection to the storm drain at the swimming pool (Building 108). 

On 17 February 1994 the Navy commenced tank removal activities for tank #110. Tank #110 was located on the north side of Building 108. Tank #110
was a 2,060-gallon, steel, single-walled tank formerly used for diesel storage for a boiler. The Navy had listed tank #110 as inactive. 
 Building 108
did not have a boiler associated with it. All heating requirements were provided by a heat exchanger located in Building 109 (see Section 2.4 Building 109) that operated using steam heat provided by Building 10. 

Based on a review of the Navy’s Industrial Wastewater permits, no industrial wastewater generating activities were conducted at Building 108 in either
the 1993 or 1994 permits. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating activities were conducted at Building 108. 

Records from the BAAQMD indicate there were no air pollution sources associated with this building. Specifically the Navy’s air permit records did not
show an air pollution permit of any boiler or for Tank #110 that is associated with this building. 
  

	2.5	Building 109 (Navy Era) 

 Ames Environmental Contractors’ Boeing Aerospace Operations, Inc.
inspected Building 109 on 29 January 1993. Their results were documented in the Report of Findings, Building 555 Assessment including Buildings 107, 108, 109, 501, 555, and 566. An excerpt of this report follows. 

Building 109 is the Physical Conditioning/Dress Facility. Building 109 was constructed in 1948. 

Based on a review of historic records including the Navy’s Industrial Wastewater permits, Building 109 discharged 5 gallons per day of Heat exchanger
condensate to the sanitary sewer. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating activities were conducted at Building 109, although the wastewater permits indicate
that there was discharge of Heat Exchanger condensate. 
 Based on a review of historic records including records from the BAAQMD indicate there were no air
pollution sources associated with this building. 
 Mr. Robert Holston, an inspector for Santa Clara County’s Hazardous Materials Compliance
Division, conducted an inspection of Building 109 on 19 April 1994. Mr. Clint Fisher, of the Navy, accompanied him on this inspection. No hazardous materials storage issues were observed. He noted that the US Air Force was going to assume
operation of the pool facility. The 10 October 1992 inspection reported the following four non-compliance items. Provide secondary containment for acid and chlorine storage. Provide spill containment materials and personal protective equipment
and make it readily available in case of a spill. All hazardous material handlers must have appropriate training. Provide documentation. Initiate a weekly inspection program. Maintain documentation. The hazardous materials storage permits

  
 7 

 
document 350 gallons of corrosive materials. (See Appendix B). Mr. Holston conducted a closure inspection on 19 April 1994 the following was recorded. No storage issues
outstanding. The U.S. Air Force to assume operation of this facility. 
  

	2.6	Building 113 (Navy Era) 

 Ames Environmental Contractors’ Uribe and Associates (U&A) inspected
Building 113 on 15 April 1993. Their inspection results are documented in the Report of Findings, Phase I Building Assessments, Area 2. An excerpt of this report follows. 

A review of aerial photographs suggested the present subject site was constructed after 1970 and before 1975. However, this location was formerly occupied by
a pre-existing structure, which was razed before 1970, based on aerial photographs and building diagrams. The first structure was constructed in 1944, according to historical information and was present until at least 1968 (aerial photograph).
Construction is concrete and steel; condition is reported as marginal (Proposed Assignments Database, 1993). Present use is for operations and maintenance. Building materials for concession booths are reportedly stored here (Kerr, 1993). 

The facility drawing for Building 525 indicated the previous building at this location was used as a welding shop; a drawing was not available for the
existing building. The subject site is part of Operable Unit 4 for groundwater. 
 The yard and building were full of junk furniture, empty 55-gallon drums
(previous contents unknown), pipes, fencing, firewood, ladders, swimming pool equipment and tires. Some hazardous materials were observed on a pallet, including various cleaners (see Appendix D, Photograph 3). An unidentified gas cylinder and
a propane cylinder were also noted. Hazardous waste was not evident. A minor amount of staining was observed on the accessible concrete in the storage yard. Transformer T-35 was located west of the building, within the fenced yard, and was
identified to contain PCBs. Ames’ records indicate that this transformer is associated with Building 525 (see Section 2.9). No leakage of fluid from the transformer was evident. 

Based on a review of the Navy’s Industrial Wastewater permits, no industrial wastewater generating activities were conducted at Building 113 in either
the 1993 or 1994 permits. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating activities were conducted at Building 113. 

Records from the BAAQMD indicate there were no air pollution sources associated with this building. 

 

	2.7	Building 476 (Navy Era) 

 Building 476 was constructed in 1964 and was used by the Navy Exchange for
administrative purposes as a store and as a cafeteria. The construction type was classified as permanent and is of standard construction. The building is constructed of concrete and steel. The gross square footage is 43,374. Ames’ environmental
staff did not inspect this building during realignment activities. The office space contained window type air conditioning units. 

  
 8 

 Based on a review of the Navy’s Industrial Wastewater permits, no industrial wastewater generating
activities were conducted at Building 476 in either the 1993 or 1994 permits. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating activities were conducted at Building 476.

 Records from the BAAQMD indicate there were no air pollution sources associated with this building. 

 

	2.8	Building 503 (Navy Era) 

 Ames Environmental Contractors’ Uribe & Associates (U&A)
inspected Building 503 on 15 April 1993. Their inspection results are documented in the Report of Findings, Phase 1 Building Assessments, Area 2. An excerpt of this report follows. 

Building 503, identified as the Navy Exchange Service Station or NEX, was built in 1966, and has an area of 7,240 sq. ft. Construction is concrete and steel;
condition is standard. According to the IAS (1984), the service station has been located here at Building 503 since 1967. The service station stored and dispensed fuel and performed automotive repairs and maintenance. (See Appendix D,
Photographs 4 and 5). 
 Hazardous wastes reported to be generated and/or accumulated at the site included: auto fluids, used oil, solvents, brake shoes and
dust which contains asbestos, metal cuttings from brake drums and discs, and batteries. Hazardous materials included auto fluids, cleaners, solvents, lubricants, hydraulic oil, batteries, brake shoes (IAS, 1984). The Hazmat storage area was reported
to be fenced and roofed (IAS, 1984). Only sealed batteries were reported to be sold, no electrolyte was stored (Navy, 1991). Waste liquids including solvents, were disposed of with waste oil in a holding tank (no number given) located about 500 feet
east of the building. This was probably Tank #41A. A local refining company (no reference given) periodically pumped the contents of the tank out. In the repair shop, parts were cleaned in a solvent bath, until 1978, when the station contracted for
parts cleaning (IAS, 1984). 
 According to the waste minimization summary in City of Sunnyvale Permit Application (1991), deck drains were sealed on
16 September 1991. The sink remained open and drained to the sanitary sewer. Fuel was no longer dispensed, and only vehicle maintenance was provided. According to the letter from Steven Anschutz to Mark Malachowski, 31 May 1991, City of
Sunnyvale, “all fuel was removed from the remaining USTs and adjoining pipelines.” A notice of Violation (NOV) for Total Toxic Organics (TTO) and Phenol concentrations in excess of the sewer discharge permit limitation was filed on
8 May 1991 by the City of Sunnyvale. The suspected source of the TTO was the fuel Underground Storage Tanks (USTs). There was a release of gasoline to the sanitary sewer in 1990 (Navy, 1990). 

The subject site is Operable Unit 3 for soils (IRP sites 12 and 15) and Operable Unit 4 for groundwater. The only available information concerning soil
samples collected during tank removal was for UST #41A. A soil sample contained: total petroleum hydrocarbons (TPH) as gasoline at 200 ppm, TPH as oil at 6400 ppm, total oil and grease (TOG) at 4500 ppm, and chlorinated hydrocarbons 1,1,1
trichloroethane at 3.7 ppb and PCE at 1.9 ppb; groundwater was reported in the tank pit (Quorum, 1991). 

  
 9 

 Building 503 was the site of numerous USTs and ASTs; the following tanks have all been removed (UST Database
March, 1993). Table 2 lists the tanks that were previously located at Building 503. 
 Table 2 

USTs Previously at Building 503 
  

													
	UST#	  	 Volume

(gallons)
	 	  	Construction Content	  	 Installation

Date
	  	 Removal

Date

	 #33
	  	 	10,000	 	  	steel	  	1SUG	  	1965	  	10 /11/ 90
	 #34
	  	 	10,000	 	  	steel	  	1SUG	  	1965	  	10/11/90
	 #35
	  	 	10,000	 	  	steel	  	2RG	  	1965	  	10/11/90
	 #36
	  	 	10,000	 	  	steel	  	2RG	  	1965	  	10 /1/ 90
	 #37
	  	 	12,000	 	  	fiberglass	  	3UL	  	1973	  	1/4/93
	 #38
	  	 	12,000	 	  	fiberglass	  	3UL	  	1973	  	1/4/93
	 #39
	  	 	12,000	 	  	fiberglass	  	3UL	  	1973	  	1/4/93
	 #40
	  	 	12,000	 	  	fiberglass	  	3UL	  	1973	  	1/4/93
	 #41A
	  	 	550	 	  	steel	  	waste oil	  	1965	  	6/1/91

  

	NOTES:	1 SUG = Super Unleaded Gasoline 

 2 RG = Regular Gasoline 

3 UL = Unleaded Gasoline 
 The
following tanks were also listed in the UST database: 
  

	 	•	 	#41B a 1700-gallon concrete waste oil/water separator, removed 4 January 1993. 

  

	 	•	 	#42 sump a 100 gallon concrete condensed vapor sump, installed in 1978. This sump is included in IRP SITE 15 (IAS, 1984) and was part of the product delivery system. 

 

	 	•	 	Structure 535, an oil water separator which received waste water from former washrack 438, was located northeast of Building 503. 

The following ASTs were reported to be in place: 
  

	 	•	 	# 108 a steel, 275 gallon lube oil storage tank. 

  

	 	•	 	# 109 unknown volume, used for transmission fluid storage. 

 The building included a U-Haul rental office, an
automotive shop and a brake shop. 
 Batteries were observed on a pallet, with no secondary containment. There were three floor jacks in the south wing and
five in the main wing, each with an individual hydraulic system. Solvent was still used, in self contained bath units. Floor drains were plugged. Cuttings (metal fillings turned off of brake drums and discs with a lathe) from the brake shop were
dumped near the western edge of the pavement. Hazardous material was stored, as reported, in a fenced, roofed storage area. However, no secondary containment was provided around the storage area. A surrounding curb was at the edge of the pavement.
The shop floors were bare concrete. The surrounding pavement drained to unidentified drains (sewer or storm). ACMs and spent brake pads were observed to be contained in a 55 gallon drum, which was covered, secured, and labeled. A hot water heater
was located in the men’s room, at the north end of the building. 

  
 10 

 Staining outside on the pavement is rust colored, dark grey and oily. According to the site drawings and field
observations, Tank #41A the waste oil tank, was apparently located approximately 15 feet east of the building, not 500 feet east as reported. 
 No gasoline
was stored or dispensed at the site. With the possible exception of the vapor recovery sump, all USTs have been removed. However, tank pit excavations were open during the site inspection and some piping remained at that time. The ASTs were located
near the southwest corner of the building, next to the excavation for tank #4113 (the oil water separator), and did not have secondary containment. Waste oil was stored in drums and then placed in secondary containment tubs. 

Discharge from oil water separator #4113 to the sanitary sewer was permitted (City of Sunnyvale, 1993). This separator was identified as a 1,000 gallon grease
interceptor (should be 1,700 gallon) was removed. Structure 535, the oil water separator was not connected to nor did it appear to receive waste water from Building 503. Structure 535 was permitted. 

Transformer #T-26 was located on the north side of the building. It was identified as Westinghouse model PAC 29073, 75KVA with 510,000 parts per million (ppm)
PCB and appeared to be in good condition. The Navy inspector Mr. Danny Steinmete inspected transformer T-26 on 7 February 1992 the inspection record described the following condition of this equipment. The bushing was coated with melted
tape/insulation. The condition of the equipment indicated that it needed to be shut down, inspected further, and cleaned up. Possible repairs might be needed based on a further inspection. This transformer was replaced with an air-filled transformer
that does not contain any PCBs. This new transformer still retains the identification number T-26. 
 Soil and groundwater samples may have been collected
during tank removal activities, but were not available (Chuck, 1993); these will have to be duplicated if they were not collected. At least one release, of gasoline, to the sanitary sewer has occurred. There is a possibility that some hazardous
waste may have been disposed of in the various drains (storm and/or sanitary sewer). Pending the results of the soil and groundwater investigation performed to date, additional sampling may be required. 

Significant suspect conditions were observed. Spills, releases or other activities resulting in contamination have occurred. 

Based on a review of the Navy’s Industrial Wastewater permits, no industrial wastewater generating activities were conducted at Building 503 in either
the 1993 or 1994 permits. However, Building 503 had a permitted operation on the Navy’s 1989 permit application. An oil/water separator in conjunction with the interior surface drains was being operated. The gallon per day discharged was
reported as 444. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating activities were conducted at Building 503. Industrial wastewater generation ceased in 1991 when all
floor drains in the shop area were sealed. The associated oil/water separator was removed in 1993. Sinks are present for sanitation purposes only. 

  
 11 

 Records from the BAAQMD indicate there is one air pollution source — gasoline dispensing operation-permitted
in 1996. 
 The Navy submitted a hazardous materials inventory (HMIS) to Santa Clara County for Building 503 on 10 July 1984. The inventory
reported the following storage: 
 Table 3 

1984 HMIS for Building 503 
  

							
	 Volume
 (gallons)
	  	Contents	  	Hazard Class	  	UN #
	 20,000
	  	premium gasoline	  	3	  	1203
	 20,000
	  	regular gasoline	  	3	  	1203
	 48,000
	  	unleaded gasoline	  	3	  	1203
	      550
	  	waste oil	  	3	  	1270
	      100
	  	gasoline vapor sump	  	3	  	1270

 Ms. Nicole Jakoby, an inspector for Santa Clara County’s Hazardous Materials Compliance Division, conducted an
inspection of Building 503 on 10 October 1990. She observed the closure of the four (4) 10,000-gallon USTs. She noted that little corrosion or pitting and that no holes were observed in the tanks. Groundwater was observed in the bottom of
the tank pits about 18” deep with floating product on its surface. Soil staining was observed all around the excavation. Six soil samples were collected all around the excavation. Six soil samples were collected around the sidewalls.
Mr. Robert Holston conducted an inspection on 17 February 1993. This inspection reported the following two noncompliance items. Excavated soil not properly covered to prevent surface runoff. Two 20,000-fiberglass tank on paved area
adjacent to the excavation were not properly barricaded to vehicles and citizens. This inspection requested that the conditions be mitigated with in 24 hours. 

Mr. Robert Holston conducted an inspection on 2 May 1995. This inspection reported the following six non-compliance items. Submit a Hazardous
Materials Business Plan. Secondary containment for transmission fluid, motor oil, grease, etc. is inadequate. Asphalt surface is not acceptable for containment. Provide proper containment for all materials. If structural changes are to be made the
plans must be submitted for review. Provide secondary containment for the used battery storage. Initiate weekly inspections of the material and waste storage areas and document inspection results. Provide hazardous materials and waste management
training for all employees handling hazardous substances. Secondary containment must be thoroughly cleaned up and investigated since possible soil contamination. Clean up as appropriate and submit a report to this office (Navy notified of this
problem previously.) 
 Mr. Robert Holston conducted an inspection on 10 May 1995 and the Navy’s representative Mr. Clint Fisher was
also present. This inspection reported the following. Previous inspection of Building 503 revealed heavy contamination of hazardous materials in the storage area located at the southwest corner of the building. Asphalt containment area showed oily
staining throughout. The Navy has been previously instructed to initiate site investigation and take appropriate action to clean up the area. Instruction was given prior to Base Closure. Submit a site investigation plan and schedule of activities
within 30 days. (See Appendix B). 

  
 12 

	2.9	Building 525 (Navy Era) 

 Ames Environmental Contractors’ Uribe & Associates (U&A)
inspected Building 525 on 15 April 1993. Their inspection results are documented in the Report of Findings, Phase 1 Building Assessments, Area 2. An excerpt of this report follows. 

The Bowling Alley was built in 1970, and has an area of 14,520 sq. ft. Construction is concrete and steel; condition is standard (Assignments, 1993).
Hazardous materials storage included hand cleaner, electric cleaner, parts cleaner, rust penetrant, lacquer acrylic, motor oil, pine cleaner, ammonia cleaner, contact adhesive and scouring powder (IAS, 1984). 

UST # 113 of unknown volume and steel construction, contained septic waste. The tanks were inactive (UST Database) and reportedly plugged with cement (Coe,
1993). The subject site was near Operable Unit 2 for soils and in Operable Unit 4 for groundwater. 
 Two floor drains were located in the kitchen. Waste
grease was disposed of in a container in back of the building, northwest side. Transformer T-35 was located immediately east of the building, within the fenced yard of Building 113, and was identified to contain PCBs. No leakage of fluid from the
transformer was evident. UST #113 was located on the northeast side of the building. Hazardous materials were kept in the maintenance room in the back of the building and in the janitor’s closet, and included cleaners and solvents. A locker for
flammable materials was located outside, on the north side of the building. 
 The UST was exempted from a subsurface investigation as it was used as a
septic tank. Soil samples should be collected from the locations shown next to the staining at the grease container and at the flammable materials locker. 

Based on a review of the Navy’s Industrial Wastewater permits, no industrial wastewater generating activities were conducted at Building 525 in either
the 1993 or 1994 permits. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating activities were conducted at Building 525. The Building was closed in 1992 and at this time,
the grease trap located in the kitchen area was disconnected and removed. 
  

	2.10	Building 526 (Navy Era) 

 Ames Environmental Contractors’ Uribe & Associates (U&A)
inspected Building 526 on 15 April 1993. Their inspection results are documented in the Report of Findings, Phase 1 Building Assessments, Area 2. An excerpt of this report follows. 

The Enlisted Men’s Club storage was built in 1970 and has an area of 540 sq. ft. Construction is concrete and steel; condition is reported standard.
Current use is for storage of club furniture, i.e. tables and chairs, beer kegs from Building 244 (Kerr, 1993). The subject site was near Operable Unit 2 for soils and in Operable Unit 4 for groundwater. 

No hazardous materials were observed. No sampling was recommended. 

  
 13 

 Suspect conditions were not observed. Spills, releases or other activities resulting in contamination have not
been reported. Therefore, further building assessment does not seem warranted. 
 Based on a review of the Navy’s Industrial Wastewater permits,
no industrial wastewater generating activities were conducted at Building 526 in either the 1993 or 1994 permits. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating
activities were conducted at Building 526. 
 Records from the BAAQMD indicate there were no air pollution sources associated with this building. 

 

	2.11	Building 529 (Navy Era) 

 Ames Environmental Contractors’ Uribe & Associates (U&A)
inspected Building 529 on 15 April 1993. Their inspection results are documented in the Report of Findings, Phase 1 Building Assessments, Area 2. An excerpt of this report follows. 

The Exchange Central Warehouse was built in 1970, and has an area of 2,640 sq. ft. Construction is concrete and steel; condition is reported to be marginal
(Assignments, 1993). Historical use has not generated hazardous wastes, with the exception of a photofinishing lab (IAS, 1984). Initially, spent photoprocessing fluids were discharged to the sanitary sewer. Later this waste stream was collected for
disposal as hazardous waste (Navy, 1991). The subject site was near Operable Unit 2 for soils and in Operable Unit 4 for groundwater. 
 The City of
Sunnyvale issued a notice of violation (NOV) on 4 November 1991 for the silver content of the waste water discharge exceeding the permit limitation of 0.2 milligrams per liter (mg/L). A grab sample was collected from a sealed container of
photoprocessing effluent at Building 529. The sample contained 3.2 mg/L silver. The Navy discontinued discharging effluent and closed floor drains as a corrective action to this NOV (Navy, 1991). However, discharge from the photo laboratory was
still permitted (City of Sunnyvale, 1991). 
 The site was used for NEX services; television and household appliance rental. There was a fenced storage yard
beside the building. A monitoring well is located in the storage yard. (See Appendix D, Photograph 6). According to site personnel, the photofinishing lab operated here from 1990 to about 1992. Photo developing equipment was no longer at the site.
According to site personnel, spent chemicals were stored in a 50-gallon aboveground tank, and were hauled for disposal when necessary. The MSDS file for the building indicated refrigerants, paints, metal cleaner, glue, resin and flux. Also noted in
the former photo lab were approximately 30 liters of Kodak bleach replenisher. 
 According to building personnel, Public Works was scheduled to pick up the
current hazardous materials. No staining was observed; flooring looked original. Laundry chemicals were stored in two drums on top of a pallet in the storage yard. 

Collection and analysis of soil samples were recommended next to the drums and elsewhere in the storage yard. 

  
 14 

 Based on a review of historic records including the Navy’s Industrial Wastewater permits, industrial
wastewater generating activities were ended in 1992 at Building 529 and reported closed in the 1993 and 1994 permits. All associated photoprocessing equipment was removed at this time. However, Building 529 had a permitted operation on the
Navy’s 1986 permit. The gallon per day discharged was reported as 10. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating activities were conducted at Building 529.

 Based on a review of historic records, the BAAQMD indicate there were no air pollution sources associated with this building. 

 

	2.12	Building 543 (Navy Era) 

 Ames Environmental Contractors’ Uribe & Associates (U&A)
inspected building 543 on 16 April 1993. Their inspection results are documented in the Report of Findings, Phase 1 Building Assessments, Area 2. An excerpt of this report follows. 

Building 543, the craft hobby shop, was built in 1973 and has an area of 9,000 sq. ft. (Assignments, 1993). Hazardous materials used at this site included
Nova clean, adhesive, spray sealer, and Proclean. The subject site was near Operable Unit 2 for soils and in Operable Unit 4 for groundwater. The site was used as a craft hobby shop (Coe, 1993). Groundwater downgradient of the site was contaminated
with chlorinated compounds, i.e. TCE (CLEAN). 
 Not all portions of the building were accessible. The primary use of the building appeared to be for hobby
activities, including woodworking and painting (see Appendix E Photograph 7). Staining and paint were observed outside of the building. Paint in cans was observed inside the building. 

Solvents were suspected to have been used at this site, in conjunction with paints. Soils adjacent to the pavement, south of the building, and possibly the
pavement have been impacted by paint and probably have been impacted by solvents. Therefore, this site may be a source of soil and groundwater contamination and should be investigated accordingly. 

Based on a review of the Navy’s Industrial Wastewater permits, no industrial wastewater generating activities were conducted at Building 543 in either
the 1993 or 1994 permits. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating activities were conducted at Building 543. 

Records from the BAAQMD indicate there was one air pollution source - sawdust vacuum cleaning operation- permitted until 1993. 

 

	2.13	Building 554 (Navy Era) 

 Building 554 was constructed in 1975 and was used by the Navy Exchange for
administrative purposes as the garden shop. The construction type was classified as semi-permanent and is of standard construction. The building is constructed of concrete and steel. The gross square footage is 27,493. Ames’ environmental staff
did not inspect this building during realignment activities. 

  
 15 

 Building 554 was equipped with a transformer labeled T-36. This transformer was located on the East Side of this
building. The style of this transformer was A13E5105DD, the serial number was 75F011017 and its size was 225 KVA. The manufacturer was Westinghouse. 

Based on a review of the Navy’s Industrial Wastewater permits, no industrial wastewater generating activities were conducted at Building 554 in either
the 1993 or 1994 permits. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating activities were conducted at Building 554. 

Records from the BAAQMD indicate there were no air pollution sources associated with this building. 

 

	2.14	Building 556 (Navy Era) 

 The Ames Environmental Contractors’ Uribe & Associates (U&A)
inspected Building 556 on 16 April 1993. Their inspection results are documented in the Report of Findings, Phase 1 Building Assessments, Area 2. An excerpt of this report follows. 

Building 556 was the Credit Union, which was built in 1979 and is a two-story building; surface area was not available. Construction is concrete/steel;
condition is standard (Assignments, 1993). There were no suspect structures evident prior to building construction based on the review of the aerial photographs. The subject site was near Operable Unit 2 for soils and in Operable Unit 4 for
groundwater. 
 The only hazardous materials observed were cleaning supplies, kept in a closet. Suspect conditions were not observed. Spills, releases or
other activities resulting in contamination have not been reported. Therefore, further building assessment does not seem necessary. 
 Based on a review of
the Navy’s Industrial Wastewater permits, no industrial wastewater generating activities were conducted at Building 556 in either the 1993 or 1994 permits. A review of the Navy’s Industrial Waste Engineering Study’s Final Report
indicates no industrial wastewater generating activities were conducted at Building 556. 
 Records from the BAAQMD indicate there were no air pollution
sources associated with this building. 
  

	2.15	Building 585 (Navy Era) 

 Building 585 is the Army Reserves’ truck wash. This truck wash was
constructed after the Navy’s departure in 1994. This truck wash was included in Closure Plan 1 and addressed the transportation yard that is shared by the California Air National Guard and the Army Reserves. Therefore this feature will not be
addressed in this plan. 
  

	2.16	Building 596 (Navy Era) 

 The Ames Environmental Contractors’ Uribe & Associates (U&A)
inspected Building 596 on 16 April 1993. Their inspection results are documented in the Report of Findings, Phase 1 Building Assessments, Area 2. An excerpt of this report follows. 

  
 16 

 Building 596 was a McDonald’s’ restaurant, built in 1985, and had an area of 2,500 sq. ft. Construction
was concrete and wood; condition was standard (Assignments, 1993). There was a permitted grease trap (City of Sunnyvale, 1993); information on hazardous materials/waste was not available. A non-PCB transformer (T-96) is present (Transformer
Database, 1993). A site drawing was not available. The subject site was near Operable Unit 2 for soils and in Operable Unit 4 for groundwater. 
 The site
was in immaculate condition. Hazardous materials, consisting of cleaners and degreasers, were stored on shelves in the back of the restaurant. The grease trap was cleaned on an as needed basis. Grease was properly disposed of in a waste grease bin,
located in back of the building. No staining was observed. Suspect conditions were not observed. 
 Based on a review of the Navy’s Industrial
Wastewater permits, Building 596 has a grease trap with a capacity of approximately 34 gallons. The Building discharged approximately 500 gallons per day from cleaning and sanitary sources as reported in the 1993 and 1994 permits. One, grease trap
was listed with dimensions of 23” X 14” X 24”. The gallon per day discharged was reported as 1,570 in the Navy’s 1984 permit. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicated no other
industrial wastewater generating activities were conducted at Building 596. 
  

	2.17	Building 944 Formerly 244 (Navy Era) 

 Records from the BAAQMD indicate there were no air pollution
sources associated with this building. 
 Building 944 was constructed in 1941 and was used by the Navy’s Morale, Welfare, and Recreation (MWR) as the
Enlisted Men’s Club/Parcheezi’s Pizza. The building is constructed of concrete and wood. The gross square footage is 11,724. The building is equipped with two HVAC units, one is located on the north side and the other is located on West
Side. 
 Ames’ Environmental Contractors inspected Building 944 on 16 April 1993. Building 944 was equipped with fluorescent lighting. A grease
trap was observed. Hazardous materials were observed consisting of ammonia, bleach, charcoal, charcoal lighter, solvents, cleaners, and soaps. Staining by hazardous materials and spills of hazardous materials were not observed. Several floor drains
were observed (two inside the building and two outside the building). An underground storage tank (UST) was located near the southwest corner of the building as evidenced by the vent stack and fill port and was presumed to be UST Number 112.
Mr. Don Chuck, formerly with the Navy, verbally indicated that the Navy conducted an investigation of the facility for the presence of the reported UST. Using a backhole the Navy dugup potholes to uncover the suspected UST, however a UST
was not identified. Based on the results of this field investigation it was reported that a tank did not exist at this location. 
 Based on a review of the
Navy’s Industrial Wastewater permits, no industrial wastewater generating activities were conducted at Building 944 in either the 1993 or 1994 permits. Building 944 was reported as inactive in the 1993 permit and the Building was reported as
closed in the 1994 permit. However, Building 944 had permitted operations on the Navy’s 1984 permit. Two grease traps were listed with dimensions of 36” X 48” X12” and 60” X 24” X 24”. The

  
 17 

 
gallon per day discharged was reported as 7,627. A review of the Navy’s Industrial Waste Engineering Study’s Final Report indicates no industrial wastewater generating activities were
conducted at Building 944. 
 Records from the BAAQMD indicate there were no air pollution sources associated with this building. 

 

	3.0	SITE RECONNAISSANCE 

 A list of equipment associated with the hazardous materials handling operations
such as, air conditioners, electrical transformers, smoke detectors, exit signs, paint booths, refrigerant recycling equipment were compiled. Equipment identified is itemized on Table 4.

TABLE 4 
 EQUIPMENT LIST

  

											
	 Equipment
	  	 Quantity
	  	 Location
	  	 Salvage
	  	 Disposal
	  	
Relocate On-Site

	 Fire Extinguishers
	  	129	  	 107, 109,
 113, 476,

503, 525,
 529, 543,

554, 556,
 596
	  	X	  		  	X
	 Air conditioners
	  	4	  	 476, 543,
 554, 556
	  	X	  		  	X
	 PCB Transformers
	  	2	  	104, 525	  		  	X	  	
	 NON-PCB Transformers
	  	11	  	 104, 476,
 503, 543,

554, 556,
 596, 944
	  	X	  	X	  	X
	 Smoke detectors
	  	NA	  		  		  		  	
	 Fluorescent Lights
	  	878	  	 108, 109,
 476, 529,

543, 554,
 556, 596
	  	X	  	X	  	X
	 Exit Signs
	  	28	  	 109, 525,
 543, 554,

944
	  	X	  		  	X
	 Vehicle Lift
	  	6	  	503	  	X	  	X	  	X
	 Eye Wash/Shower
	  	2	  	109, 503	  	X	  		  	X
	 Propane cylinder security cage
	  	2	  	543	  	X	  		  	X
	 Corrosive Cabinet
	  	1	  	109	  	X	  		  	X
	 Flammable Storage
	  	5	  	476, 503,	  	X	  		  	X
	 Cabinets
	  		  	543	  		  		  	
	 Water Heaters
	  	1	  	596	  	X	  		  	X
	 Battery Storage
	  	Unknown	  	104	  	X	  		  	X
	 Heat Exchanger
	  	1	  	109	  	X	  		  	X

  
 18 

	4.0	CURRENT OPERATIONS 

 This section describes the current activities being conducted at the site. 

 

	4.1	Building 104 (Post — Navy Era) 

 Building 104 was inspected on 4 April 2001 by the Ames
Environmental Staff. Building 104 is the 2.4 KV Substation operated by Code JFP. Building 104 and the associated structures do not hold hazardous materials permits with Santa Clara County; therefore, Santa Clara County does not require a formal
closure for Building 104. This Substation has battery storage that is used to open or close the breakers. The battery storage does not require a permit from Santa Clara County since it is considered part of the equipment, and is not considered
hazardous materials storage. The batteries must be either relocated or disposed of prior to closure and or demolition of this facility. Appendix E (Photographs 1, 2, and 3) show photographs of the Substation yard, the storage shed, and
the battery room and were taken on 4 April 2001. One PCB transformer (T-23) and three non-PCB transformers are present. 
 Based on a review of the
Ames Industrial Wastewater Permit Application issued July 2000, no industrial wastewater generating activities are conducted at Building 104 and none were observed during the inspection. 

No air pollution sources were observed from the walk-through inspection conducted on 4 April 2001. 

 

	4.2	Building 107 (Post — Navy Era) 

 Building 107 was inspected on 4 April 2001 by Ames
Environmental Staff. Building 107 is the U.S. Navy ROICC office occupied by Navy personnel and does not hold hazardous materials permits with Santa Clara County. Therefore, Santa Clara County does not require a formal closure for Building 107. (See
Appendix E, Photograph 4) presents the photograph of the exterior of Building 107 taken on 4 April 2001. 
 Based on a review of the Ames
Industrial Wastewater Permit Application issued July 2000, no industrial wastewater generating activities are conducted at Building 107 and none were observed during the inspection. 

No air pollution sources were observed from the walk-through inspection conducted on 4 April 2001. The 20-gallon electric water heater in the
building does not require an air pollution permit. 
  

	4.3	Building 108 (Post — Navy Era) 

 Building 108 was inspected on 10 May 2001 by Ames
Environmental Staff. Building 108 is the Swimming Pool and is operated by the NASA Exchange. Building 108 does not hold hazardous materials permits with Santa Clara County; therefore, Santa Clara County does not require a closure plan for Building
108. 

  
 19 

 Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000, no industrial wastewater
generating activities are conducted at Building 108 and none were observed during the inspection. The Swimming Pool is drained a maximum of once per year for any required cleaning and maintenance. 

No air pollution sources were observed from the walk-through inspection conducted on 10 May 2001. Specifically, no boiler operation was observed in
this building. 
  

	4.4	Building 109 (Post — Navy Era) 

 Building 109 was inspected on 10 May 2001 by Ames
Environmental Staff. Building 109 is the Swimming Pool Office and Locker Rooms operated by the NASA Exchange. Building 109 holds hazardous materials permits for Corrosives with Santa Clara County. The equipment room holds a 500 gallon sodium
hypochlorite tank, six (50) pound bags of soda ash, a 800 pound carbon dioxide tank, as well as a corrosives cabinet storing four (1)-gallon containers of muriatic acid. Santa Clara County will require formal closure at least 30 days prior to
closure. 
 Based on a review of the Ames’ Industrial Wastewater Permit Application issued July 2000, Building 109 has a heat exchanger that
discharges approximately 5-gallons per day to the sanitary sewer. This heat exchanger must be removed and the steam line connection and the sanitary sewer connection sealed prior to demolition. 

No air pollution sources were observed from the walk-through inspection conducted on 10 May 2001. The 6,000-pound Carbon Dioxide tank located inside
the building does not require an air pollution permit. 
  

	4.5	Building 113 (Post — Navy Era) 

 Building 113 was inspected on 1 May 2001 by Ames Environmental
Staff. Building 113 is the Navy Exchange (NEX) Facility Maintenance Shop operated by the NEX, who is hosted by Onizuka Air Force Base (OAFB). Building 113 and the associated structure store paints, adhesives and some carbon dioxide. This enclosed
yard is used to store excess maintenance equipment and serves as a location to work on building maintenance issues. This building does not appear to have any hazardous materials permits issued by Santa Clara County. OAFB were contacted about this
activity and they indicated that they will be investigating the need for permitting this location or relocating the materials to a permitted location. The Ames Environmental Staff will continue to track this building to ensure that proper permits
have been issued. In the event permits are issued for this storage, then the Santa Clara County will require a closure application for Building 113 at least 30 days prior to closure. Appendix E, Photograph 5 is of the Building 113 enclosure
taken on 1 May 2001. 
 Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000, no industrial wastewater generating
activities are conducted at Building 113 and none were observed during the inspection. 
 Building 113 has a low-usage, touch-up painting and
solvent-wipe-cleaning operation that is presently exempt from the air permit requirements. After relocation of the operation, the exempt status of the source shall be reevaluated. 

  
 20 

	4.6	Building 476 (Post — Navy Era) 

 Building 476 was inspected on 1 May 2001 by Ames Environmental
Staff. Building 476 is the NEX Department Store operated by the NEX. Building 476 does not hold any hazardous materials permits with Santa Clara County. Santa Clara County does not require a closure plan for Building 476. Two Non-PCB transformers
are present. 
 Based on a review of the Ames’ Industrial Wastewater Permit Application issued July 2000, a Hot Dog Trailer with steam heating
equipment was located on the South side of Building 476. This trailer generated approximately 10 gallons per day of wastewater discharged to the sanitary sewer. This trailer was closed in January 2001 and the sewer connections removed. The July 2001
Permit Application will be updated to reflect this operational change. 
 No air pollution sources were observed from the walk-through inspection conducted
on 1 May 2001. The two 60-gallon and 20-gallon natural gas powered water heaters do not require air pollution permits. 
  

	4.7	Building 503 (Post — Navy Era) 

 Building 503 was inspected on 1 May 2001 by Ames Environmental
Staff. Building 503 is the NEX Automotive Parts and Maintenance operated by the NEX. Building 503 holds hazardous materials permits for Flammable Liquids with Santa Clara County. Appendix F presents the Hazardous Materials Inventory Statement
for Building 503 and the 2 February 1996 County Inspection results. Mr. Holston conducted the inspection and was accompanied by Mr. Gary Walls and Mr. Jerry Reid. The following items were documented. Review of the proposed
relocation plan for the aboveground hazardous materials storage at the NEX Gas Station has been conducted. The plan would be approved per the following requirements. Aboveground tanks containing hazardous materials are to be secondarily contained.
Secondary containment is to be monitored weekly. The concrete floor in the storage area is to be sealed to prevent absorption of spilled materials. Notify the county when the relocation has been completed. Relocation is to allow the remediation by
the Navy of the existing storage area outside the building due to past spills and leaks. 
 Appendix F also presents the results of the 28 June
1996 County Inspection results of the above ground tank (AGT) installation. Mr. Holston conducted the inspection. The following items were documented. Primary piping to be tested at 60 pounds per square inch (psi) in the future. Secondary
piping pressure test of 5 psi tested tight. The vapor recovery and vapor return lines tested tight at 5 psi. The sump tightness test was completed and the sumps tested tight. 

On 11 July 1996 the County conducted an inspection of the AGT installation and the following was documented. The vapor recovery system tested tight. The
primary lines also tested tight. The tanks and the primary piping passed the pressurized testing on the 16th and 17th of July. 
 On 13 August 1996,
the County conducted an inspection and the results of this inspection are also presented. Mr. Holston conducted the inspection and was accompanied by Mr. Gary Wells. The following items were documented. Provide a written monitoring plan
including inspection procedures, response to alarms, etc. Leak detection system must be capable of shutting down pumps in the event of an alarm. Provide the required labels for the tanks. Provide a key for the alarm printout and include a plot plan
identifying probe locations. Submit an updated Business Plan and inventory statement. All to be completed prior to starting operation. 

  
 21 

 On 9 October 1997 Mr. Holsten inspected the site accompanied by Mr. Ruben Williams. The following
was noted. Conduct the annual tank monitoring system inspection by a qualified technician and provide certification. Reset probes in the ground level sumps adjacent to the fuel tanks. (Probe was relocated to prevent alarm). Water in the sump must be
removed and measures taken to prevent future intrusion. Check the high-level alarm at the fuel storage tanks for accuracy. Develop a plot plan identifying all system probes and their locations. Provide oil filter drain system and procedure for the
NEX Gas Station. 
 The 30 June 1999 inspection documents the following. Submit an updated map for the Auto Repair Shop Area. Waste coolant being
recycled onsite. Label the waste coolant container. 
 The 7 July 1999 inspection results reported that the hazardous waste disposal records for the
waste parts cleaning solvent and contaminated rags were reviewed. The brake metal shavings profiled as non-RCRA bearing hazardous waste and being disposed as “Recycled Materials”. No violations were noted at this time. An air-filled
transformer is present. This transformer was replaced with an air-filled transformer that does not contain any PCBs. This transformer replaced the Westinghouse model PAC 29073, 75KVA with 510,000 parts per million (ppm) PCB but it still retains the
identification number of T-26. 
 Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000, no industrial wastewater
generating activities are conducted at Building 503 and none were observed during the inspection. There are sinks present for domestic use only. 
 The
retail store has retail sized containers of motor oil and antifreeze for military personnel purchases. The maintenance shop has flammable storage cabinets, automotive battery storage (new and used), one 55-gallon waste coolant drum and a 360-gallon
waste oil tank. There are three 10,000 gallon aboveground tanks storing gasoline. The service station has five dispensers. The maintenance bays have a total of six vehicle lifts. The west side of Building 503 stores 17 cylinders of carbon dioxide.

 Santa Clara County will require formal closure for the hazardous materials storage and the aboveground tanks at least 30 days prior to the start of
closure activities. The Hazardous Materials Storage Facility Closure Guidelines are presented in Appendix G. Soil and groundwater sampling may be required upon removal of the tank and associated equipment (pipelines, dispensers). If sampling
is required as part of the closure process, the County will also require a post closure report that includes the sampling analysis data. Appendix E, Photographs 6, 7, and 8, presents the photographs of the Building 503 maintenance bays and
associated storage taken on 1 May 2001. 
 Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000, no industrial
wastewater generating activities are conducted at Building 503 and none were observed during the inspection. There are sinks present for domestic sanitation use only. 

Three air pollution sources were observed during the 1 May 2001 walk through inspection. The gasoline dispensing operation is permitted by the BAAQMD,
the Armakleen M-100 aqueous parts washer is exempt from the air permit requirement, and the Safety-Kleen 105 parts washer requires further evaluation for air permit applicability. This evaluation is currently
being conducted. 

  
 22 

	4.8	Building 525 (Post — Navy Era) 

 Building 525 was inspected on 1 May 2001 by Ames Environmental
Staff. Building 525 is the NEX Visual Merchandise Office operated by the NEX. This was the former bowling alley with kitchen/restaurant. The kitchen has a walk-in sized cooler. All the sinks and grease traps have been removed. There are two floor
drains just outside the kitchen door. These drains are recessed into the floor and pose a tripping hazard. The drains should be covered to prevent personnel from tripping. The drains must be closed to prevent unauthorized discharges. Building 525
does not hold any hazardous materials permits; therefore, Santa Clara County will not require a formal closure for Building 525. Appendix E, Photograph 9, presents the photograph of the interior of Building 525, taken on 10 May 2001. A
PCB transformer (T-35) is present and has 265 ppm of PCB. 
 Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000,
no industrial wastewater generating activities are conducted at Building 525 and none were observed during the inspection. 
 No air pollution sources were
observed from the walk-through inspection conducted on 1 May 2001. 
  

	4.9	Building 526 (Post — Navy Era) 

 Building 526 was inspected on 4 April 2001 by Ames
Environmental Staff. Building 526 is currently being used to store tables, chairs, and shelves/racks that were relocated from Building 944. Building 526 is maintained by Code JFF. Building 526 does not hold hazardous materials permits; therefore,
Santa Clara County will not require a formal closure. Appendix E, Photograph 10 presents the photograph of the exterior of Building 526 taken on 4 April 2001. 

Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000, no industrial wastewater generating activities are conducted at
Building 526 and none were observed during the inspection. 
 No air pollution sources were observed from the walk-through inspection conducted on
4 April 2001. 
  

	4.10	Building 529 (Post — Navy Era) 

 Building 529 was inspected on 10 May 2001 by Ames
Environmental Staff. The Moffett Fire Department stores some equipment in Building 529. There was no hazardous materials storage observed in this building, therefore, Santa Clara County will not require a closure plan. This building was a former
Navy photography laboratory. Some staining present on the linoleum floor may be due to photo processing chemical spills. 

  
 23 

 Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000, no industrial
wastewater generating activities are conducted at Building 529 and none were observed during the inspection. 
 No air pollution sources were observed from
the walk-through inspection conducted on 10 May 2001. 
  

	4.11	Building 543 (Post — Navy Era) 

 Building 543 was inspected on 10 May 2001 by Ames
Environmental Staff. Building 543 is the Onizuka Air Force Self Help Store. This building stores small hardware store items, office/home furniture, kitchen appliances (stoves and refrigerators) and yard maintenance equipment (7 gas lawn mowers) and
carpet cleaning machines. Located outside on the south wall on Building 543 were 4 empty flammable storage cabinets, 2 propane cylinder security cages, and 2 compressor pumps with a compressor tank. Many of the offices in Building 543 are vacant.
Building 543 does not hold hazardous materials permits; therefore, Santa Clara County will not require a formal closure. A Non-PCB transformer is present. 

Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000, no industrial wastewater generating activities are conducted at
Building 543 and none were observed during the inspection. 
 No air pollution sources were observed from the walk-through inspection conducted on
10 May 2001. The 40-gallon natural gas powered water heater does not require an air pollution permit. 
  

	4.12	Building 554 (Post — Navy Era) 

 Building 554 was inspected on 1 May 2001 by Ames Environmental
Staff. Building 554 is the NEX Home Store. The Home Store has a warehouse for storing household items for retail sale, walk-in coolers, a nursery section with living plants, soils and fertilizers, and a Baskin-Robbins/Deli Counter. The NEX
Home store does not hold any hazardous materials permits; therefore, Santa Clara County will not require a formal closure. All retail packages of fertilizers and other potential gardening chemicals must be removed prior to closure of the building. A
Non-PCB transformer is present. 
 Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000, no industrial wastewater
generating activities are conducted at Building 554 and none were observed during the inspection. There is a sink in the Deli area used for sanitation purposes that discharges approximately 25 gallons per day to the sanitary sewer. 

No air pollution sources were observed from the walk-through inspection conducted on 1 May 2001. 

 

	4.13	Building 556 (Post — Navy Era) 

 The Ames Environmental Staff inspected building 556, the Credit
Union, on 10 May 2001. Building 556 has a 300 gallon diesel generator located in the south west corner of the parking lot. The diesel generator must be removed and closed in accordance with the Santa Clara County aboveground tank guidelines
presented in Appendix G. Santa Clara County will require formal closure at least 30 days prior to closure. A Non-PCB transformer is present. 

  
 24 

 Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000, no industrial wastewater
generating activities are conducted at ● Building 556 and none were observed during the inspection. 
 No air pollution sources were observed from the
walk-through inspection conducted on 4 April 2001. The emergency power generator located outside the building requires further evaluation for air pollution permit applicability. This emergency generator may be required to apply for an air
pollution permit by the newly proposed regulation of the BAAQMD. 
  

	4.14	Building 596 (Post — Navy Era) 

 Building 596 was inspected on 8 May 2001 by Ames Environmental
Staff. Building 596 is a McDonald’s restaurant operated by the Moffett Exchange (MEX). There is a permitted grease trap, approximately 34 gallons in capacity, in the washing area that is, cleaned every 30 days. The grease is disposed of in the
dumpster at the rear of the building. Hot water is provided by a 60 gallon gas water heater. The building has numerous flourescent lights in the kitchen and serving areas. There were 4 fire extinguishers observed that may be relocated for further
use. There are no lighted exit signs present. Hazardous materials storage consists of standard cleaning/degreasing agents stored at the rear of the building. The building is kept very clean and neat. No staining was observed. There are 2 restrooms
present. A non-PCB transformer is present. 
 Based on a review of the Ames Industrial Wastewater Permit Application issued July 2000, industrial wastewater
generating activities conducted at Building 596 consist of approximately 750 gallons per day discharged to the sanitary sewer from cleaning and domestic sanitation. The permitted aforementioned grease trap must be properly cleaned, disconnected and
the sewer connection sealed prior to demolition of this building. 
 No air pollution sources were observed during the walk-through inspection conducted on
4 April 2001. The 60-gallon natural gas powered water heater does not require an air pollution permit. 
  

	4.15	Building 944 (Post — Navy Era) 

 Building 944 was inspected on 4 April 2001. This building is
maintained by Code JFF. NASA’s Ballroom Dancing Club uses part of this building. Many of the rooms are in disarray with furniture piled up high and wires/cables hanging from the ceiling. There are walk-in coolers as part of the former kitchen.
There are two grease traps, 90 gallon and 150 gallon capacity, still in place that must be cleaned, properly disconnected, capped and disposed of prior to demolition of this building. Appendix E, Photographs 10 and 11, presents the
photographs of the exterior of Building 944 and one of the grease traps taken on 10 May 2001. A Non-PCB transformer is present. 
 Based on a
review of the Ames Industrial Wastewater Permit Application issued July 2000, no industrial wastewater generating activities are conducted at Building 944 and none were observed during the inspection. 

  
 25 

 No air pollution sources were observed during the walk-through inspection conducted on 10 May 2001.

  

	5.0	EXISTING ENVIRONMENTAL CONSTRAINTS 

 This section discusses environmental constraints that will impact
the closure and demolition of operations for the site. 
 Aerial Photographic Review 

Ames Environmental Contractors’ Boeing Aerospace Operations, Inc. reviewed the aerial photographs. Their evaluation was documented in the Report of
Findings, Building Assessment 555. An excerpt of this report follows. 
 The MFDP environmental staff reviewed aerial photographs from 1956 to 1989. Stated
below is a summary from each of the photographs for the Southwest (SW) and Northwest (NW) corners of McCord and Wescoat Road. The photo number refers to the Navy numbering system for each photograph reviewed. 

 

	1933	Photo A93-0073-4 

 The 1933 photograph showed two buildings in the hobby shop location
(#100 and #101). No other structures of concern are present in the NW and SW areas. 
  

	1935	Photo A93-0073-7 

 The 1935 photograph showed two buildings in the hobby shop location
(#100 and #101). No other structures of concern are present in the NW and SW areas. 
  

	1936	Photo A93-0073-8 

 The 1936 photograph showed two buildings in the hobby shop location
(#100 and #101). No other structures of concern are present in the NW and SW areas. 
  

	1943	Photo A93-0073-9 

 In 1943, Buildings 95 and 96 were present. Approximately half of each
building is open (three sided with a roof). This area appeared to be used for parking automobiles and possibly for storage of supplies. There was a small structure to the north of building 96. The tennis court was present. Two buildings were present
in the hobby shop location (#100 and #101). There was a small fenced off area adjacent to the southern most structure (101). 
  

	1944	Photo A93-0073-10 and A93-0073-11 

 The structures in the 1944 photograph appeared to be
in the same arrangement as in the 1943 photograph. The two 1944 photographs reveal the area of concern from the east and west directions. It was obvious that Buildings 95 and 96 were open (three sided and roofed) structures on both the east and west
sides. 

  
 26 

	1956	Photo A21208 and A21209 

 In 1956, there appeared to be four structures and a swimming
pool (#108) with associated building (#109) in the SW corner. Building 96 and the warehouse were present with an adjacent tennis court in the NW corner. 
  

	1967	Photo A39499-5 

 In 1967, there appeared to be six structures and a swimming pool with
associated building. Based on the 1966 Welcome Aboard magazine, the SW corner hosted the bank, garage hobby shop (101), and hobby shop (100) and swimming pool (108). Buildings 95 and 96 were present with an adjacent tennis court in the NW
corner. 
  

	1968	Photo A40509-10 

 In 1968, there appeared to be eight structures and a swimming pool.
Buildings 95 and 96 were present with an adjacent tennis court in the NW corner. 
  

	1970	Photo A70-2293 

 In 1970, there appeared to be eight structures and a dome enclosed
swimming pool. Buildings 95 and 96 were present with the adjacent tennis court. 
  

	1971	Photo A71-6050 

 In 1971, there appeared to be nine, structures and an open swimming
pool. The additional building is in an “L” shape configuration. Buildings 95 and 96 were present and the adjacent tennis court in the NW corner. 
  

	1972	Photo A72-1013 

 In 1972, there appeared to be nine structures and a swimming pool. The
pool is covered with an inflatable dome cover. There were paved parking areas. There were roofed three sided structures present that had dirt floors. These structures appeared to be part of the garage hobby shop. Buildings 95 and 96 were present
with an adjacent tennis court. 
  

	1973	Photo A73-2525-18 

 The swimming pool dome cover was removed. There were eight structures
including the building associated with the swimming pool. The parking areas were paved. Buildings 95 and 96 and the warehouse were present along with the tennis court in the NW corner. Buildings 95 and 96 were surrounded by pavement where the hobby
shop and garage hobby shop complex have not been paved. 
  

	1975	Photo AC75-1140-5 

 Some of the roofed three-sided buildings were not present in this
photograph. The bank was present as Building 107. The swimming pool was uncovered. Buildings 95 and 96 were present along with the adjacent tennis court in the NW corner. 
  

	1976	Photo AC76-0813-7 

 Buildings 95 and 96 were present along with the adjacent tennis
court. No parked automobiles were observed on the dirt lot. A Quonset but was present. The swimming pool was uncovered. 

  
 27 

	1977	Photo AC77-0864-1 

 Buildings 95 and 96 were removed. The footprint of the buildings was
visible. The tennis court was present. The Quonset but was present. There were a few parked automobiles on the dirt lot. 
  

	1987	Photo AC87-0470-1.4 

 The current Building 555 was present in this photograph. There was
a new extension of Edquiba Road that separates the barracks (Buildings 148 through 156) from the Building 555. A new Building 566 was present (constructed in 1979). There was a paved parking area over the former location of Building 96 and the
adjacent warehouse. 
  

	1989	Photo AC87-0470-1.4 

 There is no visible change from the aerial photograph taken in
1987. 

  
 28 

	5.1	Monitoring and Extraction Wells 

 There are four (4) groundwater extraction and 23 monitoring wells
known to exist in the vicinity of Buildings 104, 107, 108, 109, 113, 476, 503, 525, 526, 529, 543, 554, 556, 596, and 944 (see Figure 4). Table 5 lists the well numbers and the ownership. 

TABLE 5 
 GROUNDWATER
MONITORING AND EXTRACTION WELLS 
  

			
	 WELL
	  	 OWNER

	 REG-3A
	  	MEW*
	 REG-4A
	  	MEW*
	 REG-6B1
	  	MEW*
	 REG-7B1
	  	MEW*
	 46B1
	  	MEW
	 51B2
	  	MEW
	 66A
	  	MEW
	 81A
	  	MEW
	 ERM-06A1
	  	NAVY
	 WU4-03A1
	  	NAVY
	 WU4-04A2
	  	NAVY
	 WU4-07A2
	  	NAVY
	 W09-38A1
	  	NAVY
	 W09-41A2
	  	NAVY
	 W9SC-20
	  	NAVY
	 W9SC-21
	  	NAVY
	 W9SC-17
	  	NAVY
	 W91-01A1
	  	NAVY
	 W09-37A1
	  	NAVY
	 W67-01A1
	  	NAVY
	 W68-01A1
	  	NAVY
	 WNX-01A1
	  	NAVY
	 WNX-02A1
	  	NAVY
	 WNX-03A1
	  	NAVY
	 WNX-04A1
	  	NAVY
	 W09-30A1
	  	NAVY
	 3C
	  	MEW

  

	NOTE: *	- MEW RGRP Groundwater Extraction Wells. 

 It is believed that all of the wells are completed at surface grade.
Wells of this type are often overlooked during construction activities and can be inadvertently damaged or destroyed unless proper demarcation is performed prior to construction activities. The Navy and MEW companies will develop their own
requirements for the developers to implement related to wellhead protection procedures and requirements. 

  
 29 

 If no other options are available and a well must be destroyed, then the well owner must be notified in the
planning stage of the proposed project(s). Additionally, if a well is damaged or destroyed during demolition/construction activities, the well owner must be notified as soon as possible. The Navy, MEW companies, the EPA, and the RWQCB may require
that a replacement well be installed by the developer if a well is destroyed or damaged beyond repair. The Navy and MEW companies will develop their own requirements for the developers to implement related to the replacement of destroyed wells (if
required). 
 Before any well is altered or destroyed, the well owner must be notified and their approval must be granted. A point of contact for the Navy
and the MEW companies will be identified. The EPA and RWQCB must be notified before a well is destroyed. Additionally, the Ames Environmental Services Office must also be notified before a well is destroyed. 

A Well Destruction Permit from the Santa Clara Valley Water District (SCVWD) is required before a well is destroyed. The permit must be submitted to the SCVWD
at least 10 days prior to well destruction. A minimum 24-hour notice must be given to SCVWD Well Inspection Department prior to well destruction. A District Inspector must be on site to witness the destruction procedure. Contractors performing the
work must be C-57 licensed. The driller/consultant must have a current copy of their Worker’s Compensation Insurance on file with the SCVWD. 
 A Well
Installation Permit from the SCVWD is required before a well is installed. The permit must be submitted to the SCVWD at least 10 days prior to well installation. A minimum 24-hour notice must be given to SCVWD Well Inspection Department prior to
installing the annular seal. A District Inspector must be onsite to oversee the installation procedure. Contractors performing the work must be C-57 licensed and must have a current copy of their Workers Compensation Insurance on file at SCVWD. A
copy of the Department of Water Resources Well Completion Report must be submitted to SCVWD within 30 days of well installation. 
 5.1.a Groundwater
Conditions 
 The wells listed in Table 5 are located within the central portion of the north of Highway 101 MEW groundwater plume, where the
total toxic organic (TTO) concentrations historically have ranged from 10.9 mg/L to 36,474 ug/L. Representative wells within the closure plan area (see Figure 4), along with the associated chemical concentrations are presented in Table 6.
Vinyl chloride has also been detected in three wells above action levels (W9SC-17, WNX-02A1, and WNX-04A1). Seasonal depths to groundwater range between 8-feet and 12-feet bgs. Groundwater flow in the area is generally to the north, exhibiting a
rather flat gradient of approximately 0.007 ft/ft. 

  
 30 

 TABLE 6 

MONITORING WELL COC’S 
  

																															
	 WELL

ID
	  	WELL
OWNER	  	Chemical of Concern
(ug/L)’	 
	  	  	1,1,1 -
TCA	 	  	1,1-
DCA	 	  	1,1-
DCE	 	  	1,2-
DCE	 	  	PCE	 	  	TCE	 	  	TTO2	 
	 46B1
	  	MEW	  	 	58	 	  	 	42	 	  	 	140	 	  	 	290	 	  	 	<5	 	  	 	2700	 	  	 	3,200	 
	 51B2
	  	MEW	  	 	<1.0	 	  	 	<1.0	 	  	 	<1.0	 	  	 	5.4	 	  	 	<1.0	 	  	 	5.5	 	  	 	10.9	 
	 66A
	  	MEW	  	 	70	 	  	 	70	 	  	 	<50	 	  	 	NA	 	  	 	<100	 	  	 	590	 	  	 	730	 
	 81A
	  	MEW	  	 	<50	 	  	 	71	 	  	 	<50	 	  	 	530	 	  	 	<50	 	  	 	680	 	  	 	1,281	 
	 ERM-06A1
	  	NAVY	  	 	<2.0	 	  	 	44	 	  	 	38	 	  	 	500	 	  	 	<2.0	 	  	 	190	 	  	 	772	 
	 WU4-03A1
	  	NAVY	  	 	19	 	  	 	41	 	  	 	88	 	  	 	410	 	  	 	<50	 	  	 	5500	 	  	 	6,058	 
	 WU4-04A2
	  	NAVY	  	 	13	 	  	 	41	 	  	 	180	 	  	 	240	 	  	 	<200	 	  	 	36000	 	  	 	36,474	 
	 WU4-07A2
	  	NAVY	  	 	14	 	  	 	10	 	  	 	48	 	  	 	170	 	  	 	<17	 	  	 	1900	 	  	 	2,142	 
	 W09-38A1
	  	NAVY	  	 	27	 	  	 	37	 	  	 	56	 	  	 	270	 	  	 	13	 	  	 	3200	 	  	 	3,603	 
	 W09-41A2
	  	NAVY	  	 	15	 	  	 	43	 	  	 	94	 	  	 	500	 	  	 	21	 	  	 	9200	 	  	 	9,873	 
	 W9SC-20
	  	NAVY	  	 	9	 	  	 	37	 	  	 	120	 	  	 	140	 	  	 	<25	 	  	 	6200	 	  	 	6,506	 
	 W9SC-21
	  	NAVY	  	 	4	 	  	 	47	 	  	 	69	 	  	 	600	 	  	 	3	 	  	 	2300	 	  	 	5,326	 
	 W9SC-17
	  	NAVY.	  	 	<250	 	  	 	24	 	  	 	120	 	  	 	4300	 	  	 	10	 	  	 	1200	 	  	 	5,654	 
	 W91-01A1
	  	NAVY	  	 	10	 	  	 	22	 	  	 	40	 	  	 	340	 	  	 	<20	 	  	 	2000	 	  	 	2,412	 
	 W09-37A1
	  	NAVY	  	 	20	 	  	 	47	 	  	 	150	 	  	 	460	 	  	 	<25	 	  	 	3400	 	  	 	4,077	 
	 W67-01A1
	  	NAVY	  	 	6	 	  	 	17	 	  	 	24	 	  	 	250	 	  	 	6	 	  	 	1200	 	  	 	1,503	 
	 W68-01A1
	  	NAVY	  	 	<3	 	  	 	37	 	  	 	18	 	  	 	340	 	  	 	150	 	  	 	74	 	  	 	619	 
	 WNX-01A1
	  	NAVY	  	 	<50	 	  	 	51	 	  	 	49	 	  	 	890	 	  	 	<50	 	  	 	610	 	  	 	1,600	 
	 WNX-02A1
	  	NAVY	  	 	<25	 	  	 	47	 	  	 	16	 	  	 	480	 	  	 	<25	 	  	 	4	 	  	 	2,147	 
	 WNX-03A1
	  	NAVY	  	 	<33	 	  	 	16	 	  	 	28	 	  	 	240	 	  	 	<33	 	  	 	1300	 	  	 	1,584	 
	 WNX-04A1
	  	NAVY	  	 	<33	 	  	 	29	 	  	 	10	 	  	 	220	 	  	 	<33	 	  	 	11	 	  	 	270	 
	 W09-30A1
	  	NAVY	  	 	<100	 	  	 	53	 	  	 	59	 	  	 	1000	 	  	 	<100	 	  	 	220	 	  	 	1,332	 
	 Cleanup Level
	  	 	200	 	  	 	5	 	  	 	6	 	  	 	10	 	  	 	5	 	  	 	5	 	  	 	—  	 

  

	NOTE:	1 — ug/L: Micrograms per liter (ppb) 

 2 — TTO: Total Toxic Organics 

 

	5.2	Lead Sampling Study of Surface Soils 

 Two investigations were conducted to evaluate the presence of lead
in the shallow surface soil near structures located at Moffett Field. The investigations were implemented to determine if the lead paint used on these structures may have negatively impacted the shallow surface soils. 

5.2.a Chemical Waste Management, INC. (CWMI) Surface Soil Lead Survey From 30 July through 16 August 1993, CWMI collected surface soil
samples from the perimeter of buildings at the former NAS Moffett Field that have, or may have had, painted exteriors. A total of 332 samples were collected between these dates. 

All soil samples were collected within 2 feet of a building. EPA Test Method 6010 was used to analyze the samples for Total Inorganic Lead as a Total
Threshold Limit Concentration (TTLC). Samples with a TTLC concentration for lead of 50 mg/kg or greater were then analyzed for the 

  
 31 

 
Soluble Threshold Limit Concentration (STLC) of Lead by EPA Test Method 6010. During the collection of soil samples areas of obvious soil contamination were not observed at or near the buildings.
The results for the buildings discussed in this Closure Plan are displayed in Table 7. 
 TABLE 7 

LEAD CONCENTRATIONS AND RECOMMENDATIONS 

(CWMI SURVEY) 
  

											
	 Building

Number
	  	 Number of

Samples

Analyzed
	  	 Sample

Identification
	  	 TTLC

Value
 mg/kg
	  	 STLC

Value
 mg/l
	  	 Building

Recommendation

	107	  	2	  	A2-107-1	  	110	  	2.7	  	No further action
		  		  	A2-107-2	  	150	  	0.77	  	No further action
	109	  	4	  	A2-109-1	  	74	  	N.D.	  	No further action
		  		  	A2-109-2	  	34	  	*	  	No further action
		  		  	A2-109-3	  	59	  	N.D.	  	No further action
		  		  	A2-109-4	  	46	  	*	  	No further action
	476	  	4	  	A2-476-1	  	7.4	  	*	  	No further action
		  		  	A2-476-2	  	13	  	*	  	No further action
		  		  	A2-476-3	  	23	  	*	  	No further action
		  		  	A2-476-4	  	36	  	*	  	No further action
	525	  	4	  	A2-525-1	  	11	  	*	  	No further action
		  		  	A2-525-2	  	78	  	1.2	  	No further action
		  		  	A2-525-3	  	49	  	*	  	No further action
		  		  	A2-525-4	  	74	  	0.71	  	No further action
	526	  	1	  	A2-526-1	  	48	  	*	  	No further action
	543	  	4	  	A2-543-1	  	240	  	2.5	  	No further action
		  		  	A2-543-2	  	230	  	3.8	  	No further action
		  		  	A2-543-3	  	38	  	*	  	No further action
		  		  	A2-543-4	  	120	  	0.54	  	No further action
	554	  	6	  	A2-554-1	  	9.8	  	*	  	No further action
		  		  	A2-554-2	  	25	  	*	  	No further action
		  		  	A2-554-3	  	14	  	*	  	No further action
		  		  	A2-554-4	  	32	  	*	  	No further action
		  		  	A2-554-5	  	65	  	0.63	  	No further action
		  		  	A2-554-6	  	41	  	*	  	No further action
	556	  	6	  	A2-556-1	  	16	  	*	  	No further action
		  		  	A2-556-1	  	34	  	*	  	No further action
		  		  	A2-556-1	  	11	  	*	  	No further action
		  		  	A2-556-1	  	26	  	*	  	No further action
		  		  	A2-556-1	  	29	  	*	  	No further action
		  		  	A2-556-1	  	25	  	*	  	No further action
	596	  	1	  	A2-596-1	  	27	  	*	  	No further action
	944	  	3	  	A2-244-1	  	N.D.	  	*	  	No further action
	(Old 244)	  		  	A2-244-2	  	44	  	*	  	No further action
		  		  	A2-244-3	  	21	  	*	  	No further action

  

							
	 Note:
	  	*	  	-	  	Data Not Available
		  	**	  	-	  	DISC now considers lead at measurable concentrations of 350 mg/kg or greater to be a hazardous waste.

  
 32 

 The low levels of lead present do not warrant any further investigation. 

5.2.b Weston Inc., Lead Based Paint Investigation Report for NAS Moffett Field, EPA Region IX 

From 27 July to 31 July 1998, Roy F. Weston, Inc., conducted a lead based paint sampling program to evaluate the presence of lead on building
exteriors and in the soil of non-residential areas of the former NAS Moffett Field. Buildings were initially selected for sampling based on a previous sampling effort performed by CWMI from 30 July to 16 August 1993 and on visual
observations made during a 3 June 1998 site visit. Buildings were selected where high concentrations of lead were detected during the CWMI sampling efforts, those with abundant painted surfaces, and those that were surrounded by soil. 

An initial X-ray fluorescence (XRF) field survey was used to confirm the presence or absence of lead based paint on the building surface before soil at the
sites was sampled. The number of samples collected at each location was determined by a sampling priority assigned to each individual building. In general, two samples were collected at each location. 

Field personnel collected the first sample at each site from the soil immediately adjacent to the structure. The second sample was collected at the projected
drip line. Each soil sample was taken from the surface to an approximate depth of 1” along a horizontal length parallel to the structure. Clearly visible gravel, pebbles, and plant material were removed from the sample and discarded. Noticeable
paint chips were preserved in the sample. A description of the soil was recorded. Field personnel also documented the date, time, weather conditions, orientation of the structure and sampling location, condition of the paint on the structure, and
the direction of surface runoff. 
 In addition to the field X-ray fluorescence testing, laboratory analysis was performed on the soil samples collected.
There is a strong correlation between field XRF soil lead concentrations and concentrations measured by laboratory analysis. Field XRF measurements can be used to accurately predict expected laboratory concentrations when a site specific correlation
study is performed. 
 A total of 120 soil samples collected were analyzed for lead by X-ray fluorescence spectrometry using a Niton Corporation Model
XL-309 XRF. Analytical results for buildings in this Closure Plan are displayed below in Tables 8 and 9. Table 8 shows the results of the survey of the Lead Based Paint on structure surfaces. 

  
 33 

 TABLE 8 

RESULTS FROM XRF LEAD-BASED PAINT SURVEY OF STRUCTURES 
  

									
	 BUILDING
	  	LOCATION
(DESCRIPTION)	  	L* mg/cm2
(surface reading)	  	K* mg/cm2
(deep reading)	  	DEPTH
INDEX
	 107
	  	South Face Trim	  	>2.6	  	2.3 to 10	  	9
	 107
	  	South Face	  	2.3 +/- 0.3	  	-0.7 to 7.8	  	6.7
	 107
	  	South Face	  	>1.6	  	1.3 to 7.5	  	8.9

  

	Note: *	L and K denote meter wavelength settings. 

 Table 9 lists the analytical results from the soil sampling and the
values predicted from the laboratory results after a linear regression based on results less than 10,000 mg/kg. 
 TABLE 9 

PREDICTED LABORATORY LEAD CONCENTRATIONS 
  

									
	 SAMPLE NO.
	  	BUILDING
NO.	  	LOCATION	  	XRF
Conc.
mg/kg	  	Pred. Lab Conc.
(<10,000 mg/kg
regression)
	 Moft-110
	  	107	  	Adjacent	  	34	  	71
	 Moft-111
	  	107	  	Drip line	  	49	  	86
	 Moft-112
	  	107	  	Adjacent	  	104	  	139
	 Moft-113
	  	107	  	Drip line	  	138	  	172

 BUILDING 107 OVERVIEW 

This structure is constructed of wood. Lead Based Paint was detected in all of the three XRF surface readings taken. The condition of the paint on the building
was generally good to fair, was not currently peeling, and there was no evidence of past peeling Traces of paint chips were visually noted at the surface of the soils in the sampling areas but none were noted in the samples taken. 

The structure drip line on the ground was well defined and was 12 inches from the building. Two locations were sampled on the south side of the building; the
soil samples were collected at the building and at the drip line (12 inches). The results were very low (see Table 7) ranging from non-detect to 172 mg/kg lead, with the higher lead concentrations in the samples taken at the drip line at each
location. The average detected concentration of lead was 132 mg/kg. The results of this investigation are comparable to the previous study. The low levels of lead present do not warrant any further investigation. 

 

	5.3	MEW Regional Groundwater Remediation Program (RGRP) System 

 The MEW companies operate a RGRP system to
remediate contaminated groundwater from the regional plume. The system consists of 15 groundwater extraction wells, groundwater 

  
 34 

 
conveyance piping, and a groundwater treatment system. The extraction wells use submersible pumps and are connected to groundwater conveyance piping. The wellheads are constructed in manholes at
surface grade. The conveyance piping consists of double contained 3-inch to 8- inch PVC pipe located at depths of 2-to 4-feet below ground surface. The MEW groundwater treatment facility is not located at the site; however, there are four MEW RGRP
extraction wells (REG-3A, REG-4A, REG-6B1, and REG-7B1) and their associated piping located in the site area, as are numerous MEW and NAVY monitoring wells. The MEW companies and the Navy will develop requirements for wellhead protection. The MEW
companies must be notified during the planning stage of the proposed construction if any component of the RGRP system needs to be altered or moved. 
  

	5.4	Areas of Potential and Existing Contamination 

 During the site walk through and review of historical
uses, several areas of potential soil contamination were identified and are discussed in the following sections. During the course of redevelopment-related construction activities, it is possible that areas of previously identified contaminated soil
will also be encountered. The site also overlies the regional groundwater plume so any groundwater encountered is likely to be contaminated with solvents. 

It is critical that personnel familiar with identifying and characterizing contaminated materials be on-site to facilitate the management of these materials.
It is also required that all personnel engaging in subsurface construction activities have training in accordance with Occupational Safety and Health Administration’s (OSHA) Hazardous Waste Operations and Emergency Response requirements. OSHA
requires 24 hours of training for construction personnel working on a Superfund Site, and 40 hours of training if the personnel will excavate contaminated soil and/or groundwater. 

 

	5.5	Removal of Areas of Existing Contamination 

 In the area to the north and east of Building 503 there are
three Installation Restoration Program sites, Sites 14, 15, and 18, established under the Navy’s Comprehensive Environmental Response Compensation and Liability Act (CERCLA) cleanup activities. Additional areas where there is the potential for
soil contamination are listed below. These areas are discussed in the following sections. 
  

	 	•	 	the Building 104 transformer substation; 

  

	 	•	 	the former fueling station at Building 107; 

  

	 	•	 	the existing NEX Service Station at Building 503; 

  

	 	•	 	the former bowling alley at Building 525; 

  

	 	•	 	the Exchange Central Warehouse at Building 529; 

  

	 	•	 	the former craft hobby shop at Building 543; and 

  

	 	•	 	the Credit Union at Building 556. 

  
 35 

 These areas are discussed in the following sections. 

5.5.a Site 14 
 Site 14 includes a former motor vehicle
fueling area that contained two underground fuel storage tanks (Tanks 67 and 68). In 1990 Tank 67 was removed and Tank 68 was closed in place. Tank 68 was subsequently removed in 1994 as part of an OU2-West remedial action (see Site 18 discussion in
the following). Fuel oil and waste solvents were stored in these tanks. Reported soil contaminants include 1,2-DCA, 1,2-DCE, TCE, PCE, toluene, phthalates, and TPH. 

5.5.b Site 15 
 Site 15 includes a former sump-oil/water
separator. Available information indicates that the former sump-oil/water separator is no longer present at the site. 
 5.5.c Site 18 

Site 18 is the site of the former onsite dry cleaners (former Building 88). The dry cleaners sump (Sump 66), previously located on the north side of the
building was removed in 1990. During a 1994 NAVY OU2-West remedial action cleanup at this site, demolition and removal of Building 88, Sump 91 and Tank 68 was completed. PCE used in the dry cleaning process was found in site soils and the underlying
groundwater. 1,2-DCE, TCE and TPH were also detected in site soils and in groundwater. Contaminated site soils were removed and remediated at the Navy’s onsite soil treatment pad. The excavated areas, sampled prior to import of clean backfill,
indicated that all unsaturated soil contamination above cleanup levels had been removed. 
 5.5.d Building 104 

Building 104, an electrical distribution substation built in 1943, has an area of approximately 2500 sq. ft. Electrical equipment is situated in a fenced yard.
There are two structures; one is a workshop, the other is a battery room. This facility is a 12Kv substation and has four transformers. One PCB transformer (T23) and three non-PCB transformers are present. There is potential surface contamination at
this site that should be further evaluated. The soil and/or concrete beneath the transformers and capacitors should be sampled for PCBs. The battery room and workshop should also be sampled for metals and semi- volatile organics. 

5.5.e Building 107 
 Building 107 was originally used as a
gasoline station that is estimated to have served as a gasoline station from 1948 to the early 1950’s. Remnants of islands that served as air and water dispensers are present. These islands are located against the north side of Building 107
facing Wescoat Road. There were two 4,000 gallon underground storage tanks (USTs), Tanks 86A and 86B located on the west side of the building. The tanks were removed from the site in January 1993, under a permit issued by Santa Clara County, and the
area was covered with soil. On 7 January 1993 four soil samples were collected and two water samples were collected from the excavation pit. Analytical results from the soil samples collected during closure of Tanks 86A and 86B reported,
non-detect (ND) for Benzene, Toluene, Ethyl benzene and total Xylenes (BTEX) and purgeable hydrocarbons (total petroleum hydrocarbons as gasoline). There were, however, detectable concentrations of BTEX (up to 2,470 ug/L) and purgeable hydrocarbons
(up to 7,300 ug/L) present in the groundwater samples collected at the time of tank removal actions. 

  
 36 

 5.5.f Building 503 

Building 503, identified as the Navy Exchange Service Station or NEX, was built in 1966, and has an area of 7,240 sq. ft. The service station stored and
dispensed fuel and performed automotive repairs and maintenance. All USTs have been removed from the site. However, some subsurface tank piping may be present at the site. The maintenance shop has flammable storage cabinets, automotive battery
storage (new and used), one 55-gallon waste coolant drum and a 360-gallon waste oil tank. There are three 10,000-gallon aboveground tanks storing gasoline. The service station has five dispensers. The maintenance bays have a total of six vehicle
lifts. There are currently a number of active below ground hydraulic lift systems in use in the service bays located within the building. Additionally, concrete patches in the bay flooring may indicate the former presence of below ground hydraulic
lift systems. Based on historical site activities and facility practices, soil samples should be collected for VOCs, TPHs and metals analysis. 
 5.5.g
Building 525 
 The Moffett Bowling Alley, Building 525 was built in 1970. Hazardous materials storage in the maintenance room in the back of the
building and in the janitor’s closet, included hand cleaner, electric cleaner, parts cleaner, rust penetrant, lacquer acrylic, motor oil, pine cleaner, ammonia cleaner, contact adhesive and scouring powder. 

A UST (Tank 113) of unknown volume and steel construction, contained septic waste. The tank was reportedly plugged with cement. The UST was exempted from a
subsurface investigation as it was used as a septic tank. Hazardous materials were kept and included cleaners and solvents. A locker for flammable materials was located outside, on the north side of the building. Soil samples should be collected
from the locations next to the staining at the grease container and at the flammable materials locker. Transformer T-35 was located immediately east of the building, within the fenced yard of Building 113, and was identified to contain PCBs. Soil
samples should be collected at the site for VOC and PCB analyses. 
 5.5.h Building 529 

The Exchange Central Warehouse, Building 529 was built in 1970. Historical use did not reportedly generate hazardous wastes, with the exception of a
photofinishing lab. Initially, spent photoprocessing fluids were discharged to the sanitary sewer. Later this waste stream was collected for disposal as hazardous waste (Navy, 1991). The photoprocessing equipment was removed by 1994. Collection and
analysis of soil samples for VOCs and metals are recommended in the former storage yard area. 
 5.5.i Building 543 

Building 543, the craft hobby shop, was built in 1973. Hazardous materials reportedly used at this site included Nova clean, adhesive, spray sealer, and
Proclean. Staining and paint were reportedly observed outside of the building in 1994. Paint cans were also observed inside the building. It is assumed that solvents were used, in conjunction with paints. Soils adjacent to the pavement, south of the
building and possibly the pavement have been impacted by paint and probably have been impacted by solvents. Based on historical uses at Building 543, soil samples should be collected for VOCs. 

  
 37 

 5.5.j Building 556 

Building 556, the Credit Union, has a 300-gallon diesel generator located in the southwest corner of the parking lot. The site has no other known historical
uses other than the Credit Union. Soil samples near the generator are recommended for TPH-d analyses. 
  

	5.6	Facility Sampling and Analysis 

 Table 10 lists the recommended surface sampling locations and
analysis required for closure of the site. 
 TABLE 10 

SURFACE SAMPLING AT 

BUILDINGS 104, 525, 529, 543 AND 556 
  

							
	 BLDG.

#
	  	 AREA

TO BE
 SAMPLED
	  	 ANALYTES/

ANAYTICAL

METHODS.’
	  	Number
of
Samples
	 104
	  	 Electrical Distribution

Substation.
	  	 PCB’s (8082)

SVOC’s (8020)
 Metals
(6010)
	  	3
				
	 525
	  	 Moffett Bowling Alley.

UST and
 Transformer Area
	  	 PCB’s (8082)

VOC’s (8010)
	  	4
				
	 529
	  	 Exchange Central

Warehouse.
 Storage Yard
	  	 VOC’s (8020)

Metals (6010)
	  	2
				
	 543
	  	 Craft Hobby Shop.

Yard, South Side
	  	 VOC’s (8020)

Metals (6010)
	  	●2
				
	 556
	  	 Credit Union.

Diesel Generator
	  	TPH-d (m8015) 2	  	2

  

	NOTE:	1 - EPA analytical methods. 

 2 - Modified EPA Test Method. 

A detailed description of surface soil sampling for each of the areas listed in Table 10 is presented in the following sections. Soil sampling locations are
shown on Figure 5 entitled “Proposed Soil Sample Locations”. 
 5.6.a Site 14 

The former USTs (Tanks 67 and 68) that contained fuel have been removed from the site and the site closed. Therefore, additional sampling is not recommended
for the site at this time. However, during demolition activities, contractors should be aware of residual soil TPH contamination at the site. 
 5.6.b
Site 15 
 Available information indicates that the former sump-oil/water separator is no longer present at the site. Therefore, sampling is not
recommended at the site. 

  
 38 

 5.6.c Site 18 

The historic operation of the dry cleaners that was located at former Building 88 has been reportedly remediated as part of a 1994 NAVY OU2-West remedial
action cleanup. Available reports indicate that all unsaturated soil contamination above cleanup levels had been removed from the site. Therefore, additional sampling is not recommended at the site. 

5.6.d Building 104 
 One soil sample should be collected
from beneath the concrete floor in the battery room and analyzed for SVOC’s (8020) and Metals (6010). Two soil samples should be collected from the substation yard and analyzed for PCB’s (8082). 

5.6.e Building 107 
 Analytical results from the soil
samples collected during closure of tanks 86A and 86B were non-detect. Therefore, additional sampling is not recommended at the site. 
 5.6.f Building
503 
 Since the NEX Service Station is an active facility, sampling is not recommended at this time. However, once the building is vacated, soil samples
should be collected and analyzed for VOCs (8020), TPHs (m8015) and metals (6010). 
 5.6.g Building 525 

Soil samples will be collected at three locations for PCB’s (8082) and VOC’s (8010). One soil sample will be collected in the area where the
transformer was located, and two locations at the former Tank 113. 
 5.6.h Building 529 

Two soil samples are recommended in the former storage yard area. Soil samples will be analyzed for VOCs (8010) and metals (6010). 

5.6.i Building 543 
 Soil samples are recommended in the
pavement and soils area adjacent to the pavement, south of the building. Two soil samples will be collected and analyzed for VOCs (8020), and metals (6010). 

5.6.j Building 556 
 Soil samples are recommended near the
generator. Two soil samples will be collected and analyzed for TPH-d (m8015). 

  
 39 

	6.0	FACILITY CLOSURE PROCEDURES 

 This section identifies the recommended actions to be taken to properly
close this site pursuant to local regulatory agency requirements. This section also identifies areas where additional investigation may be required based on historical or current use. 

 

	6.1	Santa Clara County Requirements 

 Closure of facilities containing hazardous materials must be conducted
in accordance with the Santa Clara County “Hazardous Materials Storage Facility Closure Guidelines”. In order to facilitate the closure of the site, the Santa Clara County’s “Hazardous Materials Storage Facility Closure
Guidelines” are discussed and included as Appendix G. 
 6.1.a Hazardous Materials Storage Closure 

Buildings 109, 503, and 566 have hazardous materials storage requiring permits from Santa Clara County. Formal closure procedures will be implemented at least
30 days prior to closure. This closure plan will be submitted to Santa Clara County. 
  

	6.2	Air Pollution Control Requirements Associated with Site Closure 

 Building 503 has the only existing Bay
Area Air Quality Management District (BAAQMD) air pollution permit, the gasoline-dispensing operation. This operation’s air permit must be canceled prior to the gasoline-tank closures. Additional notification to the BAAQMD will be required
prior to the removal of the three USTs. 
 Building 113 has a low-usage touch-up painting and solvent-wipe-cleaning operation, which is presently exempt
from the air permit requirements. After relocation of the operation, the exempt status of the source shall be reevaluated. 
 Building 556 has an emergency
generator, which may be required to apply for an air pollution permit by the newly proposed regulation of the BAAQMD. 
  

	6.3	Industrial Wastewater Requirements Associated with Site Closure 

 Buildings 104, 107, 113, 476, 503, 525,
526, 529; 543, and 556 do not have processes that discharge industrial wastewater. Additionally, the grease traps that are located at Building 944 and are no longer in service do not have processes that discharge industrial wastewater. Therefore
none of these buildings are mentioned as having an industrial discharge in the City of Sunnyvale Sanitary Sewer Discharge Permit for these buildings. 

Although there are no specific industrial discharge points in the above mentioned buildings, several steps must be implemented during the demolition of these
buildings to protect the integrity of the sanitary sewer system and to ensure Ames’ continued compliance meeting discharge requirements. Prior to closure or demolition of any of these facilities, all interior floor drains and all sanitary
drains associated with the sanitary sewer system for the site should be sealed. The Ames Environmental Services Office must be notified of all actions to be taken by the project with respect to the sanitary sewer system. Additionally, the Sunnyvale
POTW must be notified of the closure and all concerns from the closure inspection should be properly addressed. 

  
 40 

 However, additional actions as discussed below are required for demolition of the Buildings 108, 109, and 596.
These buildings have industrial wastewater discharges identified under the existing Ames 2001 Sunnyvale Wastewater Discharge Permit. Building 108, the swimming pool, must be sampled and drained using Sunnyvale approved Incidental Sewer Discharge
(ISD) procedures, and have the sewer connection removed and sealed. Building 109 has a heat exchanger that must be disconnected, removed and have the sewer connection sealed. Building 596, McDonald’s restaurant, has a permitted grease trap that
must be cleaned, disconnected, removed, and the sewer connection sealed. All aforementioned actions must be completed prior to demolition. 
 All Industrial
and Domestic wastewater discharge sources identified in the Sunnyvale Wastewater Discharge Permit for the buildings in this plan will be reported to the Sunnyvale POTW and a Permit Amendment submitted to remove these sources from the existing
Permit. Any additional sampling requirements or other actions requested by the Sunnyvale POTW will be completed upon notification. All subsequent Permit Applications will reflect the removal of their wastewater sources. 

 

	6.4	Polychlorinated Biphenyls (PCBs) 

 Fluorescent light fixtures include ballasts. These ballasts may
contain PCBs. Only ballasts that are labeled “no PCBs” are known to be free of PCBs. Ballasts which lack this label must be considered to be PCB light ballasts. All PCB light ballasts and fluorescent light tubes must be handled as
hazardous waste prior to closure and demolition from the site. A civil servant from the Ames Environmental Services Office must sign hazardous waste manifests resulting from any hazardous waste disposal activity. 

Building 104 contains one PCB contaminated transformer (T-23). Building 525 contains one PCB transformer (T-35). These transformers must be properly managed
as a hazardous waste prior to closure and demolition of the site. There are an additional ten (10) oil-bearing transformers identified in this closure plan that are non-PCB containing. These transformers maybe either re-used on-site or
salvaged. There is also an air-filled transformer that does not require classification as a hazardous waste. 
  

	6.5	Burrowing Owls 

 Figure 6 illustrates the locations of burrowing owls at Moffett Field. Currently,
there are no active burrowing owl burrows located within the site. A historic burrowing owl burrow is located within the site. However, burrowing owls may move into this area prior to demolition and as such, there is the potential for either the
demolition activities or the staging areas associated with the demolition or future construction associated with the University Reserve to impact the owls. Therefore, a burrowing owl survey must be conducted. 

Within three weeks of demolition activities, Wildlife Biologist Chris Alderete must conduct an evaluation of the site. He can be reached at his office at
(650) 604- 3532 or by cellular telephone at (650) 280-7643. He must be contacted to determine owl occupation status. If owls occupy the 

  
 41 

 
area before demolition activities begin, then the California Department of Fish & Game must be consulted and any mitigation actions must be implemented. Mitigation could consist of
avoiding disturbance, passive relocation to the onsite burrowing owl preserve, or artificial nest construction nearby. 
 Additionally, active nearby burrow
locations in the site vicinity must be barricaded with delineator cones and caution tape so that construction traffic does not disturb the owls and prevents the stockpiling of materials near the owl burrows. The Wildlife Biologist will be
barricading areas near owl burrows prior to demolition. 
  

	6.6	Storm Water Management during Site Closure 

 Several reports and programs were reviewed to assess the
potential impact these buildings could have on storm water quality. Buildings 113, 476, 503 and 556 are listed in the Storm Water Pollution Prevention Plan (SWPPP) as having current operations with the potential to impact storm water. However, the
demolition or construction of any building is an activity that could impact storm water. 
 6.6.a The Navy’s Former Illicit Connection Program

 The Navy conducted an extensive survey of illicit connections during the preparation of The Comprehensive Long-Term Environmental Action Navy (CLEAN)
report, prepared by PRC Environmental Management, Inc. in 1992. The report discussed the Navy’s illicit discharge management program for the illicit connections identified at the former Naval Air Station Moffett Field. Thirty-two illicit
connections were identified along with the remedy to correct each illicit connection. 
 Building 109 was listed in the CLEAN report as having two illicit
connections. The first involved the main pool drain and the scupper drains, which were connected to the storm drain system. This allowed filter backwash water and overflow water to drain to the storm water sewer. The second illicit connection was
identified in the boiler room where the drain was connected to the storm water sewer system through the roof drainage system. Based on records, visual inspections and interviews it was determined that both of the illicit connections in Building 109
were corrected in 1993 (See Appendix H). The Heat Exchanger in Building 109 drains to the sanitary sewer when in operation and the condensate is included in the Permit Application. 

6.6.b Best Management Practices 
 Storm drains located at
the site must be protected and/or closed during any demolition activity. 
 Appendix I present the Best Management Practices (BMP’s) for the
following activities: 
  

	 	•	 	Erosion Control and Site Stabilization, 

  

	 	•	 	Building Repair, Remodeling and Construction, and 

  

	 	•	 	Construction, Demolition and Excavation Operations. 

 These BMPs must be implemented during all construction
activities at the site. 

  
 42 

 6.6.c Ames’ Storm Water Pollution Prevention Plan (SWPPP) 

Ames’ Storm Water Management program includes the chemical storage and operations at Buildings 113, 476, 503 and 556. Buildings 113 and 476 have exterior
storage of hazardous materials and Buildings 503 and 556 have aboveground storage tanks containing fuel. The Storm Water Pollution Prevention Plan (SWPPP) will be updated to reflect the removal of Buildings 104, 107, 108, 109, 113, 476, 503, 525,
526, 529, 543, 554, 556, 596, and 944 when appropriate. 
 6.6.d New NPDES Requirements for Construction 

Under the new Storm Water Phase II Final Rule of .the NPDES Storm Water Program, operators of construction activities disturbing equal to or greater than one
acre and less than five acres of land are subject to NPDES permitting requirements. Construction of an area totaling more than 5 acres requires a permit under the existing Phase I regulation. 

Construction activity disturbing less than one acre requires a permit if the following conditions are met. The activity is part of a larger common plan of
development or sale disturbing a total of one acre or greater, or the activity is individually designated for permit coverage by the NPDES permitting authority who is the Regional Water Quality Control Board (RWQCB). The NPDES Storm Water Program
currently addresses storm water discharges from construction sites disturbing five acres or greater as well as sites less than five acres if they are part of a larger common plan of development of sale disturbing a total of five acres or greater.

 The Phase II requirements will be similar to the following general requirements of EPA’s Construction General Permit: 

 

	 	•	 	Submission of a Notice of Intent (NOI) that includes general operator and site information, and a certification that the activity will not impact endangered or threatened species. This certification is unique to
EPA’s NOI and is not a requirement of most NPDES-delegated State’s NOI s. 

  

	 	•	 	The development and implementation of a SWPPP with appropriate BMPs to minimize the discharge of pollutants from the site. (This requirement is partially met by Ames’ current SWPPP that includes BMP’s for all
activities with the potential to impact storm water quality, including construction activities. However, increased monitoring and inspections of construction sites may be necessary.) 

 

	 	•	 	Submission of a Notice of Termination (NOT) when final stabilization of the site has been achieved as defined in the permit, or storm water runoff is no longer being discharged or when another operator has assumed
control of the site. 

 However, based on the implementation schedule, Phase II permits will not be available until December of 2002 or
required until March of 2003. The current annual fee for a Construction Activities Storm Water General Permit is five hundred dollars. 

  
 43 

	6.7	Spill Prevention Control and Countermeasures (SPCC) 

 Buildings 104, 476, 503, 525, 543, 554, 556, 596,
and 944 are included in the 2001 Ames’ SPCC/Facility Response Plan (FRP) documents. The SPCC Plan will be updated when these buildings are demolished. 
  

	6.8	National Historic Preservation Act 

 Section 106, National Historic Preservation Act, 1966,
requires Federal Agencies to consider the effects of their actions on historic properties. (See Figure 7). Section 106 applies to all properties already listed in the National Register, to properties formally determined eligible for
listing, and to properties not formally determined eligible but meeting specified eligibility criteria. 
 The Advisory Council on Historic
Preservation has defined the term undertaking to include Federal actions that can result in changes in the character or use of historic properties, if such properties are located in the area to be affected by an action (National
Historic Preservation Act, 1966 Section 800.2 (0)). 
 The term undertaking includes a broad range of Federal activities including construction,
rehabilitation and repair, demolition, licenses, permits, loans, loan guarantees, grants, Federal property transfers, and many other types of Federal involvement. 

Whenever one of these activities affects a historic property, the project is subject to Section 106 review. 

The responsible Federal Agency must also determine the “area of potential effects”, which is defined in council regulations as “the geographic
area or areas within which an undertaking may cause changes in the character or use of historic properties, if any such properties exist.” 
 The area
of potential effects need not be a contiguous area, it can include multiple alternative project sites, or multiple areas in which possible changes are anticipated. Buildings 107, 109, 476, 503, 525, 526, 529, 543, 554, 556, 596, and 944 were
surveyed as part of the Inventory and Evaluation of Cold War Era Historical Resources, (SAIC July 1998) and all buildings were found to be cold war era structures of a type found at any Naval installation regardless of
mission. These buildings were found not to be eligible for the National Register of Historic Places, (Criterion G). Appendix J contains the Department of Parks and Recreation (DPR) 523 forms. 

Buildings 104, 108, and 113 were examined and evaluated in conjunction with the preparation of the Historic Resources Protection Plan (PAI/ Issi, November
2000). These buildings are located outside the Shenandoah Historic District, and have been determined to be unremarkable and not eligible for the National Register of Historic Places. Appendix J contains the Department of Parks and
Recreation (DPR) 523 form for Building 113. DPR 523 forms were not completed for 108 (swimming pool) or 104 (electrical distribution station). 
  

	7.0	FUTURE ENVIRONMENTAL CONSTRAINTS 

 This section discusses environmental constraints that will impact the
future development of this property. This section applies to the University Reserve. 

  
 44 

	7.1	Monitoring and Extraction Wells 

 There are 4-groundwater extraction and 23 groundwater monitoring wells
known to exist on the site. (See Figure 4). Table 6 in Section 5.1 entitled “Monitoring and Extraction Wells” provides a list of these wells. 

It is believed that all of the wells are completed at surface grade. Wells of this type are often overlooked during construction activities and can be
inadvertently damaged or destroyed unless proper demarcation is performed prior to construction activities. The Navy and MEW companies will develop their own requirements related to wellhead protection procedures and requirements. 

If no other options are available and a well must be destroyed, then the well owner must be notified in the planning stage of the proposed project(s).
Additionally, if a well is damaged or destroyed during demolition/construction activities, the well owner must be notified as soon as possible. 
 The
Navy, MEW companies, the EPA, and the RWQCB may require that a replacement well be installed if a well is destroyed or damaged beyond repair. The Navy and MEW companies will develop their own requirements for the developers to implement related to
the replacement of destroyed wells (if required). 
 Before any well is altered or destroyed, the well owner must be notified and their approval must be
granted. A point of contact for the Navy and the MEW companies will be identified. The EPA and RWQCB must be notified before a well is destroyed. Additionally, the Ames Environmental Services Office must also be notified before a well is destroyed.

 A Well Destruction Permit from the Santa Clara Valley Water District (SCVWD) is required before a well is destroyed. The, permit must be submitted to the
SCVWD at least 10 days prior to well destruction. A minimum 24-hour notice must be given to SCVWD Well Inspection Department prior to destroying the well. A District Inspector must be on site to witness the destruction procedure. Contractors
performing the work must be C-57 licensed. The driller/consultant must have a current copy of their Worker’s Compensation Insurance on file with the SCVWD. 

A Well Installation Permit from the SCVWD is required before a well is installed. The permit must be submitted to the SCVWD at least 10 days prior to well
installation. A minimum 24-hour notice must be given to SCVWD Well Inspection Department prior to installing the annular seal. A District Inspector must be onsite to oversee the installation procedure. Contractors performing the work must be C-57
licensed and must have a current copy of their Workers Compensation Insurance on file at SCVWD. A copy of the Department of Water Resources Well Completion Report must be submitted to SCVWD within 30 days of well installation. 

 

	7.2	MEW Regional Groundwater Remediation Program (RGRP) System 

 The MEW companies operate a RGRP system to
remediate contaminated groundwater from the regional plume. The system consists of 15 groundwater extraction wells, groundwater conveyance piping, and a groundwater treatment system. The extraction wells use submersible

  
 45 

 
pumps and are connected to groundwater conveyance piping. The wellheads are constructed in manholes at surface grade. The conveyance piping consists of double contained 3-inch to 8- inch PVC pipe
located at depths of 2-to 4-feet below ground surface. The groundwater treatment system is not located at the site; however, four of the extraction wells and their associated piping are within the site. The MEW companies will develop requirements
for the developers to implement for wellhead and conveyance piping protection. The MEW companies must be notified during the planning stage of the proposed construction if any component of the RGRP system needs to be altered or moved. 

 

	7.3	Areas of Potential and Existing Contamination 

 During the site walk through and review of historical
uses, several areas of potential soil contamination were identified and were discussed in Section 5 of this closure report. See Sections 5.4 and 5.5 for a description of these areas. 

The site also overlies the regional groundwater plume so any groundwater encountered is likely to be contaminated with solvents. The MEW companies will
develop procedures for handling contaminated groundwater that cannot be discharged to the sanitary sewer. If the total concentration of chlorinated solvents is less than 1 mg/I, it may be possible to obtain an industrial wastewater discharge permit
from the City of Sunnyvale to discharge the water to the sanitary sewer. 
 It is critical that personnel familiar with identifying and characterizing
contaminated materials be on-site to facilitate the management of these materials. It is also required that all personnel engaging in subsurface construction activities have training in accordance with Occupational Safety and Health
Administration’s (OSHA) Hazardous Waste Operations and Emergency Response requirements. 
 OSHA requires 24 hours of training for construction
personnel working on a Superfund Site and 40 hours of training if the personnel will excavate contaminated soil and/or groundwater. 
  

	8.0	ENVIRONMENTAL REQUIREMENTS FOR FACILITY CONSTRUCTION 

 This section identifies the recommended actions to
be taken to properly install a new facility pursuant to local regulatory agency requirements. This section applies to the University Reserve. 
  

	8.1	Hazardous Materials Storage Installation 

 In the event that hazardous materials - including toxic gases
- will be handled at the proposed University Reserve facilities then Santa Clara County will regulate the facility. Installation of facilities constructed to handle hazardous materials must be conducted in accordance with the Santa Clara County
requirements. These include the Santa Clara County Hazardous Materials Storage Ordinance and Toxic Gas Ordinance. Liquid hazardous materials must be stored in secondary containment systems. Additionally, installation of toxic gas systems must meet
all of the County’s requirements. 
 The County must review and approve of the construction plans for secondary containment areas. A plan review fee
must be paid. Allow approximately three months for plan review. 

  
 46 

 
Additionally, the Ames Environmental Services Office must be informed of the intent to construct any such structure and to handle hazardous materials. 

Prior to occupancy, the County must inspect all facilities handling hazardous materials. Santa Clara County issues permits for storage of hazardous
materials. The County must inspect the new construction prior to storage of hazardous materials. A Hazardous Materials Business Plan must be prepared and submitted to the County for approval. The Plan must also include a Hazardous Materials
Inventory. 
 This section identifies the actions required to properly install hazardous materials storage areas and subsurface structures with Santa Clara
County Environmental Health Department. Storage permits must be issued. Appendix K contains “Permit Applications”. Prior to occupancy, an inspection by a Santa Clara County Environmental Health representative is required. 

8.1.a Tank Installation Requirements 
 Installation of new
above ground and underground tanks requires an installation plan and issuance of a permit by Santa Clara County. The County requires a 10- to 14-day plan review period for tank installation. Appendix L includes Santa Clara County guidelines
for Underground Storage Tank (UST) and Above Ground Tank (AGT) installation. There are associated permit and review fees. 
  

	8.2	Air Pollution Control Installation 

 In the event that any operations designated as air pollution sources
are proposed at the University Reserve then the project management shall be responsible to comply with the air permitting regulations of the Bay Area Air Quality Management District (BAAQMD). BAAQMD must review and approve of the construction plans.
A plan review fee must be paid. Allow approximately three months for plan review. Additionally, the Ames Environmental Services Office must be informed of the intent to construct any air pollution sources. The BAAQMD may require an inspection during
construction and prior to start up. 
 The University Reserve Operations may require a permit issued by BAAQMD. The operators must comply with all BAAQMD
requirements. Additionally, the Ames Environmental Services Office must be informed of all sources whether they are permitted or permit-exempt. 

  
 47 

	8.3	Industrial Wastewater Requirements Associated with Site Installation 

 In the event that surface and/or
subsurface structures used to treat industrial wastewater are intended at the proposed University Reserve facilities then a plan must be submitted to the POTW for their approval prior to construction. Additionally, the Ames Environmental Services
Office must be informed of the intent to construct any such structure. A plan review fee must be paid. Allow approximately three months for plan review. Additionally, prior to each unit going into operation, wastewater must be analyzed to ensure
that the effluent meets the discharge requirements. Additionally, each unit must be added to the Ames’ existing industrial wastewater discharge permit application. 
  

	8.4	Burrowing Owl Requirements Associated with Site Installation 

 Figure 6 illustrates the locations
of burrowing owls at Moffett Field as of June 2001. 
 The University Reserve includes the demolition of existing buildings and the construction of new
buildings and their associated staging areas. This activity may have the potential to impact the burrowing owls. Therefore a burrowing owl survey must be conducted. 

Within three weeks of the demolition and construction activities, Wildlife Biologist Chris Alderete must conduct an evaluation of the site. He can be
reached at his office at (650) 604-3532 or by cellular telephone at (650) 280-7643. He must be contacted to determine owl occupation status. If owls occupy the area before demolition and construction activities begin then the California
Department of Fish & Game must be consulted and possible mitigation actions required must be implemented. 
 Mitigation may consist of avoiding
disturbance or artificial nest construction. Mitigation may also consist of relocating the owls to the burrowing owl preserve to be located East of Cody Road. 

Additionally, active nearby burrow locations in the site vicinity must be barricaded with delineator cones and caution tape so that construction traffic does
not disturb the owls and to prevent the stockpiling of materials near the owl burrows. The Wildlife Biologist will be barricading areas with nearby owl burrows prior to demolition. 

 

	8.5	Storm Water Management Requirements Associated with Site Installation 

 When the proposed University
Reserve construction begins, the following measures must be implemented to protect the storm drainage system. Storm drains located at the site must be protected and/or closed during any construction work. Appendix I present the Best
Management Practices (BMP’s) for the following activities: 
  

	•	 	Erosion Control and Site Stabilization, 

  

	•	 	Building Repair, Remodeling and Construction, and 

  

	•	 	Construction, Demolition and Excavation Operations. 

 Additionally, the Storm Water Pollution Prevention Plan
(SWPPP) will be updated to reflect the installation of regulated features. The EPA issued the final rule on Wednesday 8 December 1999 that expanded the existing National Pollution Discharge Elimination System storm water program to address
construction sites that disturb one to five acres. The State of California will be the implementing agency and has not yet developed regulations pertaining to this ruling. 

  
 48 

 The goal of this rule is that implementation of Best Management Practices at small construction sites will result
in a significant reduction in pollutant discharges and an improvement in surface water quality. The project will need to comply with the intent of the law and with any regulations that are formulated. 

Since the proposed University Reserve development is greater than 5acres, the developers must comply with the Phase 1 requirements mentioned above. 

 

	8.6	Spill Prevention Control and Countermeasures (SPCC) Associated with Site Installation 

 SPCC requirements
must be considered in the design phase of this project for the storage of hazardous materials. The design firm should review the SPCC regulations to ensure future compliance. The regulations are found in Code of Federal Regulations, Title 40 part
112 and in the Lempert-Keene-Seastrand Oil Spill Prevention and Response Act published by the California Department of Fish and Game on 20 February 1995. The requirements pertain to secondary containment, consideration of the impact of a spill
from the storage in relation to the location of storm drains, and consideration of an impact from a major spill. 
 Additionally, future SPCC plans will be
updated to reflect the installation of regulated features. 
  

	8.7	Archeological Resources 

 No archeological resources are known to occur within the site. However,
prehistoric and historic use of the Moffett Field vicinity is well documented and as yet unidentified buried archeological resources could be encountered during ground disturbing activity. Figure 7 presents a plate identifying archeological
sensitive areas. 
  

	8.8	Unexpected Discovery Plan 

 The following detailed mitigation measure applies to any proposed subsurface
construction work, especially those located in known sensitive areas. This mitigation measure should be included in the construction drawings or specifications. 

In the event that human remains and/or cultural materials are found during construction activities, all project-related construction shall cease within a
50-foot radius of the remains. The Ames Environmental Services Office shall be notified immediately. Testing and mitigation measures required pursuant to the National Historic Preservation Act 16 U.S.C. 470 and Section 7050 of the California
Health and Safety Code and Section 5097.94 of the Public Resources Code of the State of California shall be implemented. 
 In the event of the
discovery of human remains, there shall be no further excavation or disturbance of the site or any nearby area reasonably suspected to overlie adjacent remains. The construction manager shall notify the Santa Clara Coroner. 

  
 49 

 NASA Federal Preservation Officer, Ken Kumor, shall be notified in order to initiate the coordination with the
Department of Interior Office of the Consulting Federal Archeologist. The coroner shall make a determination as to whether the remains are Native American(s). If the Coroner’s office determines that the remains are not subject to its’
authority, it shall, notify the Native American Heritage Commission, who shall attempt to identify descendents of the deceased Native American(s). 
 If no
satisfactory agreement can be reached as to the disposition of the remains pursuant to State law, then the remains shall be reinterred with items associated with the Native American burial on the property, in a location not subject to further
disturbance. 
 In the event the cultural artifacts or other related materials are uncovered, construction activities shall cease and a certified
archaeologist shall be consulted for management recommendations. 
  

	 	•	 	It is not considered that there is a high potential for inadvertent exposure of prehistoric Native American skeletal remains and associated grave goods at Moffett Field. However, the region’s Native Americans
consider the graves of their ancestors to be of utmost importance. The remains and the offerings buried with them are sacred to the Native Americans, and there is a strong desire among this community to prevent disturbance of burial sites. The
Native American Graves Protection and Repatriation Act (NAGPRA: Section 3) requires federal agencies to consult with likely descendants and Indian tribes prior to intentional excavation, and requires cessation of activity and notification of
tribes when there is an inadvertent discovery of Native American skeletal remains on federal land. The State of California Native American Heritage Commission (Attention: Execution Secretary, 915 Capitol Mall, Room 288, Sacramento, CA 95814) can
provide a list of tribes and most likely descendants on request. In the event of discovery of Native American skeletal remains, the implementing regulations 43 CFR 10, subpart B (Federal Register 60 (232); 62134-62169, December 4, 1995) of
NAGPRA shall be followed. 

  

	 	•	 	Curation of any recovered archeological materials not associated with Native American skeletal remains shall be curated in accordance with 36 CFR 79, Curation of Federally Owned and Administered Archeological
collections Final Rule (Federal Register 55 (177:5- 37639). September 12, 1990). Local repositories meeting the curation standards for archeological materials shall be selected over distant repositories whenever possible. 

 

	 	•	 	All archeological work shall be conducted under the direction of professional archeologists meeting the qualification standards described in Archeology and Historic Preservation; Secretary of the Interior”
Standards (Federal Register 48 (190:44716-44742, September 29, 1983). 

  
 50 

 FIGURES 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 – Extracted Images – Figure 1]

  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 – Extracted Images – Figure 2]

  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 – Extracted Images – Figure 3]

  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – SITE 18] 

 
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – FIGURE 5]

  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – FIGURE 6]

  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – FIGURE 7]

  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – FIGURE 8]

  
 

 

 APPENDIX A 

FACT SHEET 
 NASA AMES
DEVELOPMENT PLAN 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – FACT SHEET]

  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images — FACT SHEET]

  
 

 

 APPENDIX B 

SANTA CLARA COUNTY STORAGE PERMITS AND INSPECTION REPORTS 

NAVY ERA 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – Santa Clara
County Health Department] 
  
 

 

 APPENDIX C 

BIER REPORTS 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 104] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 104] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 107] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 107] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 108] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 108] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 108] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 109] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 109] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 109 – Facility 109] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 109 – Facility 109] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 113] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 113] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 476] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 476] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 503] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 503] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 525] 
  
 

 

 [Exhibit D - 6 of 11 - Closure Plan Number 5 Part 1 - Extracted Images – MFDP ENVIROMENTAL
OFFICE – Facility 525] 
  
 

 

 APPENDIX D 

HISTORIC PHOTOGRAPHS 
 NAVY ERA

  
 1 

 

 

 

 

  
 3 

 

 

  
 4 

 

 

  
 5 

 APPENDIX E 

CURRENT PHOTOGRAPHS POST NAVY ERA 

  
 6 

 

 
 Photo 1: Building 104 Yard 

  
 7 

 

 
 Photo 2: Building 104 Shed 

  
 8 

 

 
 Photo 3: Building 104 Battery Room 

  
 9 

 

 
 Photo 4: Building 107 

  
 10 

 

 
 Photo 5: Building 113 

  
 11 

 

 
 Photo 6: Building 503 Shop 

  
 12 

 

 
 Photo 7: Building 503 Shop 

  
 13 

 

 
 Photo 8: Building Shop 

  
 14 

 

 
 Photo 9: Building 525 

  
 15 

 

 

  
 16 

 

 

  
 17 

 

 

  
 18 

 APPENDIX F 

SANTA CLARA COUNTY PERMITS AND INSPECTIONS 

POST NAVY ERA 

  
 19 

 

 

 

 

  
 21 

 

 

  
 22 

 APPENDIX G 

SANTA CLARA COUNTY FACILITY CLOSURE GUIDELINES 

  
 23 

 

 

 CLOSURE GUIDELINES FOR ABOVEGROUND 

HAZARDOUS MATERIALS STORAGE FACILITIES 

For Use by Unidocs Member Agencies or where approved by your Local Jurisdiction 

 

	A.	General Information 

 A facility closure plan demonstrates that hazardous materials at a closed facility
have been transported, disposed of, or reused in a manner which eliminates the need for further maintenance and any threat to public health and safety or the environment. This document summarizes the requirements for closure of facilities where
hazardous materials have been used, stored, or handled. (Note: Remodels or partial facility closures may require submittal of elements of a Closure Plan.) 
  

	1.	A closure permit and payment of appropriate fees may be required for the closure of any storage system which has previously contained any hazardous material. Please contact your local agency regarding applicable closure
fees. 

  

	2.	A completed Closure Application for Aboveground Hazardous Materials Storage Facilities (Closure Application) must be submitted to the appropriate local agency at least 30 days prior to the start of closure activities.
(Note: Closure permits expire six months after local agency approval of the Closure Application.) 

  

	3.	A facility closure which includes underground storage tanks must also include an Underground Storage Tank System Closure Permit Application/Closure Plan. 

 

	4.	A facility closure which includes aboveground storage tanks (any container equal to or greater than sixty gallons in capacity) may require additional submittals. Please contact your local agency for details.

  

	5.	Please note that local agency requirements (e.g. inspections which may be required, etc.) will be specified in the “Comments” section at the bottom of the approved Closure Application. If inspections
are required please schedule them at least 48 hours in advance. 

  

	6.	If a groundwater monitoring well is to be closed or destroyed you must obtain a permit from the Santa Clara Valley Water District [phone no. (408) 927-0710). 

 

	7.	Additional permits (e.g. demolition permits, electrical permits, plumbing permits, etc.) may be required by the Building Department or other state or federal agencies. 

 

	B.	Submittals 

 The following must be submitted to the local agency before final closure sign-off: 

 

	•	 	A completed Closure Application: 

  

	•	 	A Closure Plan (if required), along with applicable fees; 

  

	•	 	A Post Closure Report (if required), along with applicable supporting documentation. 

  
 25 

	C.	Closure Plan Requirements 

 When required by the local agency, a Closure Plan would include but not be
limited to: 
  

	•	 	A schedule indicating projected start and completion dates; 

  

	•	 	A description of the size and type of equipment being closed, and the proposed final disposition. (Note: Equipment includes concrete, piping, duct work, tanks, and all other aboveground hazardous materials storage
systems/areas}, 

  

	•	 	A site plan showing the location of the equipment or area being closed. Include all piping and ducting to be removed; 

  

	•	 	A list of the types of chemicals previously used or stored in the area to be closed (e.g. the facility’s Hazardous Materials Inventory Statements, etc.); 

 

	•	 	The procedures proposed to be used for decontamination of the facility and equipment (if required) and the proposed method of disposal for all hazardous wastes generated from cleaning operations. Decontamination
procedures may include steam cleaning, rinsing, dismantling and removal of contaminated structural and non-structural portions of the building, etc. (Note: Contact the local Building Department regarding
their requirements). 

  

	•	 	A brief description of how all hazardous materials will be removed or properly disposed of in a manner which complies with all state and federal laws. A new owner/operator may take responsibility for the hazardous
materials as long as documentation is submitted which indicates acceptance of responsibility by the new owner/operator; 

  

	•	 	A description of the proposed sampling program (if required) including sample locations, constituents to be analyzed for, and test methods to be employed). Samples must be analyzed by laboratories certified by the State
of California to perform the applicable test methods. (Note: Sampling maybe required by the local agency if contamination is suspected. An Inspector from the local agency must be present at the time of any sampling unless prior
arrangements have been made with the local agency.) 

  

	D.	Post-Closure Report Requirements 

 When required by the local agency, a Post-Closure Report would include
but not be limited to: 
  

	•	 	Documentation confirming compliance with all items in the approved Closure Plan; 

  

	•	 	Confirmation of disposition of all hazardous materials, including virgin and waste products, through 

  

	•	 	submittal of copies of bills of lading, bills of sale, TSDF-signed copies of hazardous waste manifests, etc.; 

  

	•	 	For any sampling performed, copies of: 

  

	 	1.	Laboratory test results, including quality control/quality assurance data; 

  

	 	2.	Completed sample chains-of-custody; 

  

	 	3.	A site plan showing sample locations and, if applicable, depths; 

  

	 	4.	A written description of sample collection and handling procedures; 

  
 26 

 APPENDIX H 

TABLE A-1 
 IDENTIFIED ILLICIT
DISCHARGES, DISCHARGES REQUIRING 
 ADDITIONAL INVESTIGATION AND POTABLE WATER DISCHARGES 

  
 27 

 

 

 

 

  
 29 

 

 

  
 30 

 APPENDIX I 

STORM WATER BEST MANAGEMENT PRACTICES 

  
 31 

 GOOD HOUSEKEEPING 

BEST MANAGEMENT PRACTICES 
 DESCRIPTION

 Good housekeeping practices are designed to maintain a clean and orderly work environment. Often the most effective first step towards preventing
pollution in storm water from industrial sites simply involves using good common sense to improve the facility’s basic housekeeping methods. Poor housekeeping can result in more waste being generated than necessary and an increased potential
for storm water contamination. A clean and orderly work area reduces the possibility of accidental spills caused by mishandling of chemicals and equipment, thereby dreducing safety hazards. Well maintained material and chemical storage areas should
minimize discharges of materials / pollutants that could contaminate storm water. Simple procedures can be used to promote good housekeeping, including improved operation and maintenance of industrial machinery and processes, material storage
practices, material inventory controls, routine and regular clean-up schedules, maintaining well organized work areas, and educational programs. It is the policy of NASA Ames Research Center that managers as well as line supervisors are responsible
for ensuring that personnel are educated in proper environmental hazards management, including storm water pollution prevention. 
 TARGETED CONSTITUENTS

  

	 	•	 	Sediments 

  

	 	•	 	Nutrients 

  

	 	•	 	Floatable Materials 

  

	 	•	 	Oxygen Demanding Substances 

  

	 	•	 	Heavy Metals 

  

	 	•	 	Toxic Materials 

  

	 	•	 	Oil and Grease 

 APPLICABILITY 

This Best Management Practice is applicable to all industrial activities at Ames Research Complex. 

  
 32 

 REQUIREMENTS 
  

	1.	Conduct formal monthly inspections of all buildings and surrounding areas to ensure. 

  

	 	(a)	Outside areas are cleaned and organized; 

  

	 	(b)	Drips, leaks, or evidence of such, from equipment or pipes are contained; 

  

	 	(c)	Adequate space in work areas to minimize spill potential; 

  

	 	(d)	Garbage removed regularly; 

  

	 	(e)	Walkways and passageways easily accessible; 

  

	 	(f)	Walkways and passageways free of materials that could be spilled; 

  

	 	(g)	Evidence of dust from painting, sanding, or other industrial activities; and 

  

	 	(h)	Cleanup procedures for spilled materials exist. 

  

	2.	An inspection log should be maintained in order to feed other environmental reporting requirements at Ames Research Complex. Moreover, a formal annual inspection of Ames Research Complex should be conducted to
verify industrial activities in Storm Water Pollution Prevention Plan and identify new activities and Best Management Practices. 

  

	3.	Conduct annual inventory of chemical substances, including hazardous materials and pollutants that are present on-site. This inventory shall meet the requirements of the OSHA-required inventory of chemicals and toxic
substances. 

  

	4.	Maintain a current file of all MSDS for chemicals and toxic substances. 

  

	5.	Label chemical containers in accordance with OSHA, EPA, DOT and other applicable federal, state and local requirements. 

  

	6.	Maintain dry and clean floors and ground surfaces by using brooms, shovels, vacuum cleaners, and cleaning machines. 

  

	7.	Regularly pickup and dispose of garbage, debris and waste material. 

  

	8.	Make sure equipment is working properly. 

  

	9.	Routinely inspect for leaks or conditions that could lead to discharges of chemicals or contact of storm water with raw materials, intermediate materials, waste materials, or products. 

 

	10.	Ensure that all employees understand spill cleanup procedures. 

  

	11.	Improper storage can result in the release of materials and chemicals that can cause storm water runoff pollution. Proper storage techniques include: 

 

	 	(a)	Providing adequate aisle space to facilitate material transfer and easy access for inspections; 

  

	 	(b)	Storing containers, drums and bags away from direct traffic routes to prevent accidental containers from improper weight distribution; 

 

	 	(c)	Stacking containers according to manufacturer’s instructions to avoid damaging the containers from improper weight distribution; and 

 

	 	(d)	Storing containers on pallets or similar devices to prevent container corrosion, which can result from moisture on the ground. 

  

	12.	Maintain an up-to-date inventory of all materials (hazardous and non-hazardous). This inventory helps to keep material costs down caused by overstocking, enables the tracking of materials stored and handled on
site, and identifies which materials and activities pose the most risk to the environment. 

  
 33 

	13.	Clearly mark on the inventory hazardous materials that require special handling, storage, use, and disposal considerations. 

  

	14.	Keep the work site clean and orderly. Removing debris in a timely fashion. Sweep the area. 

  

	15.	Cover materials of particular concern such as hazardous materials or sand piles that must remain outdoors, particularly during the rainy, season. 

 

	16.	Educate employees who are doing the work. 

  

	17.	Inform on-site contractors of NASA Ames Research Center policy. Include appropriate provisions in their contract to make certain proper housekeeping and disposal practices are implemented. 

 

	18.	Make sure that nearby storm drains are well marked to minimize the chance of inadvertent disposal of residual paints and other liquids. 

 

	19.	Do not dump waste liquids down the storm drain. 

  

	20.	Advise concrete truck drivers to not wash their truck over the storm drain. 

  

	21.	Cleaning equipment or tools over catch basins is prohibited. 

  
 34 

 EROSION CONTROL AND SITE STABILIZATION 

STORM WATER BEST MANAGEMENT PRACTICES 

DESCRIPTION 
 This includes a description of all sediment
and erosion control activities. This may include the planting and maintenance of vegetation, diversion of run-on and runoff, placement of sandbags, silt screens or other sediment control devices, etc. Any site where soils are exposed to water and
wind can have soil erosion and sedimentation problems. Erosion is a natural process in which soil and rock materials is loosened and removed. Sedimentation occurs when soil particles are suspended in surface runoff or wind and are deposited in
streams and other water bodies. 
 Human activities can accelerate erosion by removing vegetation, compacting or disturbing the soil, changing natural
drainage patterns and by covering the ground with impermeable surfaces (pavement, concrete, and buildings). When the land surface is developed or “hardened” in this manner, storm water can not seep into or “infiltrate” the
ground. The result is in larger amounts of water moving more quickly across the site, which can carry more sediment and other pollutants to creeks and streams. Because the vegetation primarily consists of marshlands and grasslands, soil erosion
prevention is not required in many areas of Ames Research Complex. However, erosion prevention measures are considered during any construction and / or grounds maintenance activities. 

TARGETED CONSTITUENTS 
  

	 	•	 	Sediment 

  

	 	•	 	Heavy Metals 

  

	 	•	 	Toxic Materials 

 APPLICABILITY 

This Best Management Practice is applicable to all building, construction and landscaping activities at Ames Research Complex. 

REQUIREMENTS 
  

	1.	Identify areas which, due topography, activities or other factors, have a high potential for significant soil erosion, and identify structural, vegetative, and / or stabilization measures used to limit erosion,

  

	2.	Retain as much vegetation (plants) onsite as possible. 

  

	3.	Minimize the time that soil is exposed. Water exposed areas to control dust. 

  

	4.	Prevent runoff from flowing across disturbed areas (divert the flow to vegetated areas). 

  

	5.	Stabilize the disturbed soils as soon as possible by planting vegetation or hydroseeding. 

  

	6.	Slow down the run-off flowing across site (regrading, silt fences, planting). 

  

	7.	Provide drainage ways for the increased run-off (use grassy swales rather than concrete drains). 

  

	8.	Remove sediment from storm water run-off before it leaves the site. 

  

	9.	For large piles of soil where tarps or other covers are not feasible, place filtering media (e.g. straw bales, rocks, silt fences, etc.) around the base of each pile or at the storm drain inlet to remove these materials
from rainwater run-off. 

  
 35 

 CONSTRUCTION, DEMOLITION AND 

EXCAVATION OPERATIONS 
 BEST
MANAGEMENT PRACTICES 
 DESCRIPTION 
 Construction, demolition
and excavation projects generate a great deal of dust, debris, waste materials and wastewaters that when improperly managed can result in prohibited discharges to the storm drainage system. Various construction projects occur at Ames Research
Complex throughout the year. A Storm Water Pollution Prevention Plan is required in all contractor specifications. Furthermore, the California Storm Water Best Management Practice Handbook for Construction Activity is made available to construction
contractors working at Ames Research Complex. 
 TARGETED CONSTITUENTS 
  

	 	•	 	Sediment 

  

	 	•	 	Heavy Metals 

  

	 	•	 	Toxic Materials 

  

	 	•	 	Floatable Materials 

  

	 	•	 	Oil and Grease 

  

	 	•	 	Petroleum Products 

  

	 	•	 	Contaminated Groundwater 

 APPLICABILITY 

This Best Management Practice is applicable to all construction, demolition and excavation activities at Ames Research Complex that could potentially release
pollutants to the storm water. 
 REQUIREMENTS 
  

	1)	Each job site should be managed in such a manner to avoid discharges of prohibited substances to the storm drain system. 

  

	2)	Routine inspection of job site should be performed to ensure that construction, demolition and excavation materials (liquid or solid) are not entering the storm drain system. 

 

	3)	Cleaning equipment or tools over catch basins is prohibited. 

  

	4)	Keep the job site tidy and clean up debris regularly. 

  

	5)	Storm drain catch basins should be covered to prevent pollutants and sediments from entering the storm drain system. 

  
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	6)	Special precautions should be employed if rain is forecast or if water is applied. These precautions should include, but are not limited to: 

 

	 	a)	Increased monitoring frequency for storm drains and to rectify ongoirig releases or to identify and prevent any possible release; and 

 

	 	b)	Reduction in activities that can cause material to come into contact with rain water 

  

	7)	Following all construction, demolition and excavation activities; the job site should be swept to remove debris and residue. Catch basins should be vacuumed to remove sediment and debris. 

 

	8)	Construction, demolition and excavation materials (gravel, sand, lumber, cement, chemicals, contaminated equipment, etc.) should be stored under a roof or structure or covered with a tarp or plastic visqueen. Covered
items should be secured with ropes, sandbags, bricks, etc. to prevent or minimize contact with rainwater.. For large piles of soil or other construction materials where tarps or other covers are not feasible, place filtering media (e.g. straw bales,
rocks, silt fences,etc.) around the base of each pile or at the storm drain inlet to remove these materials from rainwater run-off. Do not store items near catch basins. 

 

	9)	Wet concrete and concrete cutting waters should be conducted to prevent discharge to the storm drains. Blocking off or plugging drains in the vicinity may be warranted. This can be done in a number of ways: placing
weighted plastic visqueen over drain, using sandbags or spill control PIGS,etc.. 

  

	10)	Equipment and machinery that contain residual concrete and concrete I asphalt cutting effluent should not be discharged to the storm drain. Estimate the amount of wastewater that will be generated and arrange to have a
storage container (tank) available. Properly dispose of wastewater off-site. 

  

	11)	Outdoor concrete work should be postponed if rain is forecast unless precautions are taken to prevent discharge of wet concrete and other construction debris to the storm drain. 

 

	12)	During pain scraping operations, use impermeable ground cloths, such as plastic sheeting, to collect dust, paint chips, etc. 

  

	13)	Use impermeable ground cloths while painting. Place in-use paint buckets in a pan or over plastic sheeting to ensure that accidental spills are not discharged to the storm drain. 

 

	14)	Mixing of paint should take place indoors or in a place that is not exposed to the elements. 

  

	15)	At the end of the workday, store paint buckets and other equipment away from contact with storm water in a secured, secondarily contained area. 

 

	16)	Treat a paint spill as a chemical spill. Capture the material before it flows to the storm drain. Clean it up promptly. Report the event to NASA Environmental Services Office, Code QE, at 604-5602.

  
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	17)	Outdoor Sandblasting should comply with the following: 

  

	 	a)	Tarpaulin or ground cloths should be placed beneath work area to capture the blasting medium and particles from the surface being cleaned; 

 

	 	b)	Consider curtailing sandblasting on a windy day, or if rain is forecast to minimize the amount of area that will require clean-up and to avoid sand waste from being washed into the storm drain; and 

 

	 	c)	Vacuum work area when job is complete. 

  

	18)	If sandblasting lead paint, comply with the following: 

  

	 	a)	Obtain approval from the Environmental Services Office and the Occupational Safely, Health and Medical Services Office at 604-5602; 

  

	 	b)	Follow measures outline in “Outdoor Sandblasting” listed above; 

  

	 	c)	Air monitoring is required; and 

  

	 	d)	Follow OSHA regulations for worker safety. 

  

	19)	For broken lines that contain anything other than potable water, the operator shall immediately notify the Environmental Office and initiate the following actions immediately: 

 

	 	a)	Berm the area to prevent run-off to storm drain; and 

  

	 	b)	Immediately block off adjacent storm drain catch basins. 

  

	20)	Other applicable General Best Management Practices include: 

  

	 	a)	GOOD HOUSEKEEPING 

  

	 	b)	EROSION CONTROL 

  

	 	c)	MATERIAL HANDLING AND STORAGE and 

  

	 	d)	SOURCE REDUCTION 

  
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 BUILDING REPAIR, REMODELING AND CONSTRUCTION 

STORM WATER BEST MANAGEMENT PRACTICES 

DESCRIPTION 
 Building repair, remodeling and / or
construction activity may vary from minor and normal building repair to major remodeling or the installation of a new facility on currently open space. These activities can generate pollutants that can reach storm water if proper care is not taken.
The sources of these contaminants may be solvents, paints, paint and varnish removers, finishing residues, spent thinners, soap cleaners, kerosene, asphalt and concrete materials, adhesive residues and old asbestos installation. 

TARGETED CONSTITUENTS 
  

	 	•	Sediment 

  

	 	•	Heavy Metals 

  

	 	•	Toxic Materials 

  

	 	•	Floatable Materials 

  

	 	•	Oil and Grease 

 APPLICABILITY 

This Best Management Practice is applicable to all facilities at Ames Research Complex. 

REQUIREMENTS 
  

	1)	Prevent or reduce the discharge of pollutants to storm water from building repair, remodeling and construction by using soil erosion controls, enclosing or covering building material storage areas, covering and /
or diking storm drain catch basins, using good housekeeping practices, using safer alternative products and training employees. 

  

	2)	Each job site should be managed in such a manner to avoid discharges of prohibited substances to the storm drain system. 

  

	3)	Routine inspection of job site should be performed to ensure that construction, demolition and excavation materials (liquid or solid) are not entering the storm drain system. 

 

	4)	Keep the job site tidy and clean up debris regularly. 

  

	5)	Storm drain catch basins should be covered to prevent pollutants and sediments from entering the storm drain system. 

  

	6)	Special precautions should be employed if rain is forecast or if water is applied. These precautions should include, but are not limited to: 

 

	 	a)	Increased monitoring frequency for storm drains and to rectify ongoing releases or to identify and prevent any possible release; and 

 

	 	b)	reduction in activities that can cause material to come into contact with rainwater. 

  
 39 

	7)	Painting operations should follow: 

  

	 	a)	Application of lead based paint is prohibited; 

  

	 	b)	Painting operations should be properly enclosed or covered to avoid drift; 

  

	 	c)	Use temporary scaffolding to hang drop cloths or draperies to prevent drift. Use application equipment that minimizes overspray; 

  

	 	d)	If painting requires scraping or sand blasting of the existing surface, use a ground cloth to collect the chips. Dispose of the residue properly; 

 

	 	e)	If the paint contains lead or tributyl tin, it requires classification as a hazardous waste; 

  

	 	f)	mix paint indoors before using so that any spill will not be exposed to rain. Do so even during dry weather because cleanup of a spill will never be 100% effective. Dried paint will erode from a surface and be
washed away by storms; and 

  

	 	g)	Properly store or dispose leftover paints. 

  

	8)	Other applicable General Best Management Practices include: 

  

	 	a)	GOOD HOUSEKEEPING 

  

	 	b)	EROSION CONTROL 

  

	 	c)	MATERIAL HANDLING AND STORAGE and 

  

	 	d)	SOURCE REDUCTION 

  
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 APPENDIX J 

DEPARTMENT OF PARKS AND RECREATION 

(DPR) 5213 FORMS 

  
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 APPENDIX L 

SANTA CLARA COUNTY UNDERGROUND/ABOVEGROUND 

STORAGE INSTALLATION GUIDELINES 

  
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 UNDERGROUND STORAGE TANK SYSTEM 

INSTALLATION GUIDELINES 

For Use by Unidocs Member Agencies or where approved by your Local Jurisdiction 

Authority Cited: California Fire Code: Title 23, Div. 3, Ch. 16 CCR; 

Hazardous Materials Storage Ordinance 

A. General lnformation 
 These guidelines are applicable
to installation of hazardous material underground storage tank systems (tanks and piping) regulated by all Unidocs Member Agencyjurisdictions. The guidelines serve as supplements to other requirements and/or guidelines (e.g. California Fire Code,
Underground Storage Tank Regulations, Guidelines for Adoption of California Underground Storage Tank Regulations, manufacturers’ guidelines, etc.). Where such regulations and the guidelines conflict, the more stringent requirement shall apply.

  

	1.	An installation permit and payment of appropriate fees shall be required for the installation or modification of any underground storage tank system which will be used for hazardous materials. 

 

	2.	Contractors shall submit, or have on file with the local agency, information verifying that they possess a current State Contractor’s License (A, B, C36, C61/D40), Workmen’s Compensation Insurance, and (if
required by the local jurisdiction) a business license. Contractor information may be obtained by calling the Contractors State License Board at (800) 321-2752. 

 

	3.	Underground Service Alert should be contacted at (800) 642-2444 prior to the start of excavation. 

  

	4.	The contractor shall be responsible for ensuring that conditions at the site provide for workplace safety, protection of the environment, and maintenance and integrity of nearby structures. 

 

	5.	Under no circumstances shall any regulated material be placed into any underground tank system without approval of the local agency overseeing installation. 

 

	6.	All tanks, piping, and equipment shall be installed and tested in accordance with the manufacturer’s recommendations/guidelines. 

B. Required Submittals 
 The following information shall
be submitted to the local agency overseeing system installation: 
  

	1.	To be submitted with application: 

  

	 	☐	Completed Underground Storage Tank System lnstallation Supplement. 

  

	 	☐	Local agency permit application(s) (e.g. fire, building, plumbing, etc.) if required. 

  

	 	☐	     sets of blueprints of the facility and underground storage tank system along with specifications on all materials to be used in construction. 

  
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 BENCHMARK 

Asbestos, Lead and Mold Investigation 

NASA-Ames (PAI Corporation) 

Building 543 
  

 

 

 

  
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 Table of Contents 
  

			
	Section:
		
		  	Executive Summary
		
	1	  	Introduction
		
	2	  	Description of Building Construction and Systems
		
	3	  	Summary of Findings for Suspect Materials
		
	4	  	Material Information Tables
		
	5	  	Removal Cost Estimate Summary
	
	Appendices:
		
	A	  	Definitions of Terms and Assessment Criteria
		
	B	  	Bulk Sampling Protocol and Analytical Methods
		
	C	  	Laboratory Bulk Sampling Reports
		
	D	  	Summary of Regulatory Requirements
		
	E	  	AHERA Building Inspector Certifications
		
	F	  	Drawings Indicating Material Locations

  
 3 

 Executive Summary 

Benchmark Environmental Engineering (Benchmark) was retained by NASA - Ames (PAI Corporation) to perform an Asbestos Hazard Emergency Response Act (AHERA)
style asbestos survey of the Merchandise Exchange Offices (Building ID: Building 543), to determine the locations of accessible and to the extent feasible, inaccessible friable and non-friable asbestos containing building materials (ACBM). 

This inspection was limited to the interior only. Pre-existing survey data was used to help provide a picture of existing condition of this building.
Benchmark collected additional samples of the construction material to help supplement existing data, to contradict existing data or to provide additional data of materials not previously identified. 

No friable asbestos-containing materials were observed in the building. Asbestos was detected in the following non-friable materials: 

Floor Tile 
 Vinyl Tile 

  
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 Section 1 Introduction 

Benchmark Environmental Engineering (Benchmark) performed an Asbestos Hazard Emergency Response Act (AHERA) style asbestos survey of the Merchandise Exchange
Offices located at Moffett Field, Mt. View, CA, to identify ACBM. This report identifies the locations and asbestos content of friable and non-friable ACBM, provides assessment of the friable ACBM in relation to the material’s hazard potential
to building occupants and provides removal cost estimates. 
 This inspection was limited to the interior only. Pre-existing survey data was used to help
provide a picture of existing condition of this building. Benchmark collected additional samples of the construction material to help supplement existing data, to contradict existing data or to provide additional data of materials not previously
identified. 
 All identified suspect asbestos-containing materials are summarized in Section 3. Materials testing positive for asbestos including material
assessments, recommended response actions, and quantities are described in Section 4. Removal cost estimates for asbestos-containing materials are included in Section 5. 

Removal cost estimates (Section 5) are for budgeting purposes only and should not be used as a quote for removal of the materials. It is not our
recommendation to remove these materials unless they are beyond repair, or planned demolition or renovation activities will disturb the materials. Estimates are based on recent pricing we have received from contractors performing similar work and
may vary from actual prices obtained due to the actual scope of work, quantity of material removed, control measures specified and contractor work loads. 

On Tuesday, August 14, 2001 Terri MacFarlane ( 90-2747), a California Certified Asbestos Consultant and Roy J. Mabus ( 92-0191), a California Certified
Asbestos Consultant, from Benchmark, performed an asbestos survey of the building(s) in accordance with the Asbestos Hazard and Emergency Response Act of 1987 (AHERA). 

DISCLAIMER 
 This report is prepared for the express use and
benefit of NASA - Ames (PAI Corporation), its agents and employees. The information in this report or portions thereof may be required to be included in notifications to employees, contractors or other visitors to the building(s). This report is not
intended to be used as a specification or work plan for any of the work suggested or recommended in this report. 
 This report is based upon conditions
observed at the property and information made available to the surveyor. This report does not intend to identify all hazards or unsafe conditions, nor to indicate that other hazards or unsafe conditions do not exist at the premises. 

  
 5 

 Section 2 Description of Building Construction and Systems 

 

					
	Number of Floors: 1	  	Year Built: 1973	  	Total Square Footage: 9,000
		
	Structural components consist of:	  	Concrete Slab
		
	Exterior Wall construction components consist of:	  	Metal
		
	Interior Wall construction components consist of:	  	Drywall
		
	Interior ceiling components consist of:	  	Ceiling Tile
		
	Roofing construction components consist of:	  	Metal
		
	Heating and mechanical systems include:	  	Sprinkler Systems

 Building Description/Comments: 

This facility is a one-story structure with a flat metal roof. The tan exterior is metal. It has a concrete slab foundation with metal exterior wall
construction. 
 Comments: 
 There was a previous asbestos
survey done by Tetra Tech, Inc. on July 9, 1993. 

  
 6 

 Section 3 Summary of Findings for Suspect Materials 

The following table is a list of all materials at this building which were tested for the presence of asbestos or were assumed to contain asbestos along with
overall sample results. Complete information on asbestos containing materials is included in Section 4 of this report. 
 Each unique material within the
building is assigned a unique HM number by the surveyor at the time the survey is performed. 
 Section 3 and Section 4 are organized by building,
surfacing, thermal systems insulation, flooring, walls, ceilings, roofing and miscellaneous materials. 
  
 

 

  
 7 

 Section 3 Summary of Findings for Suspect Materials 

The following table is a list of all materials at this building which were tested for the presence of asbestos or were assumed to contain asbestos along with
overall sample results. Complete information on asbestos containing materials is included in Section 4 of this report. 
 Each unique material within
the building is assigned a unique HM number by the surveyor at the time the survey is performed. 
 Section 3 and Section 4 are organized by building,
surfacing, thermal systems insulation, flooring, walls, ceilings, roofing and miscellaneous materials. 
  
 

 

  
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 Section 5 Removal Cost Estimate Summary 

These estimates are for budgeting purposes only and should not be used as a quote for removal of the materials. It is not our recommendation to remove these
materials unless they are beyond repair, or planned demolition or renovation activities will disturb the materials. Estimates are based on recent pricing we have received from contractors performing similar work and may vary from actual prices
obtained due to the actual scope of work, quantity of material removed, control measures specified and contractor work loads, etc. 
  

 

  
 17 

 Appendix A 

Definitions of Terms and Assessment Criteria 

  
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 Definitions of Terms and Assessment Criteria 

This survey report organizes information on each suspect ACBM identified in tables located in Section 4. This section describes how to interpret the data found
on materials listed in Section 4. 
 Material description contains the description of the suspect homogeneous asbestos containing building material.

 Material Serial Number is used to reference the material for reinspections, etc. 

Asbestos type and content describes the type of asbestos and its percentage in the material. 

Asbestos Results for positive materials are shown as a percentage. Samples having less than 1% asbestos are reported as containing “Trace” amounts
of asbestos and samples with no detected asbestos are reported as “BLD” or below limit of detection. 
 Sample number(s) identifies a particular
material sample obtained from a specific sample location. Sample numbers are used primarily for laboratory identification. 
 Sample Location identifies
where the samples of this material were obtained. 
 Material Category categorizes each material as surfacing, TSI or miscellaneous. 

Surfacing Materials - Asbestos containing materials that are sprayed-on, trawled-on or otherwise applied to surfaces, such as acoustical plaster on ceilings
and fireproofing on structural members, or other materials on surfaces for acoustical, fireproofing, or other purposes. 
 Thermal Systems Insulation (TSI)
- Asbestos containing materials applied to pipes, fittings, boilers, breaching, tanks, ducts or other interior structural components to prevent heat loss or gain or water condensation. 

Miscellaneous Materials - Asbestos containing materials applied to or a part of building components that are not classified as surfacing materials or thermal
systems insulation. 
 Quantity & Units reports approximate total quantity per unit of measure for each material. 

Building(s) & Floor(s) specifies where a material is located. 

Material Location describes where the material is found throughout the building. 

Material Condition identifies the material as Friable, Non-friable or Jacketed (for thermal systems insulation only) if asbestos is present. 

Friable - An asbestos containing material that can be crumbled, pulverized or reduced to powder, when dry, by hand pressure, such as spray applied
fireproofing on structural steel members, spray applied acoustical ceiling materials or damaged thermal systems Insulation. Friable materials are of greatest concern due to their potential fiber release. 

  
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 Non-Friable - An asbestos containing material where the asbestos is bound tightly in a matrix or sealed by a
protective layer. Non-friable materials can become friable by being rendered to a crumbled, pulverized or powdered state, when dry, by crushing, sanding, sawing, shot-blasting, severe weathering or by other mechanically induced means. Common
examples of non-friable materials are adhesives, floor tiles, transite and roofing materials. 
 Jacketed - An asbestos containing material applied to
thermal systems insulation and “jacketed” with a protective outer layer such as canvas or metal to keep the material in good condition. Undamaged jacketed ACBM is considered non-friable. If the jacketing is damaged, the material is
considered friable. 
 Damage Category describes the type of damage, if any, to the material. The following damage categories are used: None, Physical, Air,
and Water. 
 Material Assessment identifies the condition of the material in relation to physical and water damage, delamination of the material from its
substrate, the extent of the damage and the potential for damage from building conditions, such as, accessibility by building occupants, influence of vibration, etc. The six standard assessment categories ranked by hazard potential, with the first
being the lowest hazard are as follows: 1) Potential for Damage, 2) Potential for Significant Damage, 3) Damaged, 4) Damaged with Potential for Damage, 5) Damaged with Potential for Significant Damage, and 6) Significantly Damaged. Only friable
materials are assessed under AHERA regulations. Non-friable materials, unless damaged, are not assessed and can be assumed to be in good condition. 

Damaged - The damage or deterioration of the material results in inadequate cohesion or adhesion with crumbling, blistering, water stains, marring or
otherwise abraded over less than one-tenth (1/10) of the surface if the damage is evenly distributed or one-fourth (1/4) if the damage is localized. 

Significant Damage - The damage or deterioration of the material results in inadequate adhesion or cohesion and the damage is extensive and severe with one or
more of the following characteristics: 1) Crumbling or blistering over at least one-tenth (1/10) of the surface if evenly distributed, one-fourth (1/4) if the damage is localized; 2) Areas of the material hanging from the surface, delaminated, or
showing adhesive failure; 3) Water stains, gouges or marred. 
 Recommended Response suggests the appropriate options for controlling or maintaining ACBM in
a safe manner. There are four options used: 
 Operations & Maintenance (O&M) - A program designed to “manage” asbestos in-place. As long
as asbestos containing materials remain in a building, an O&M program should be instituted to alert maintenance personnel, custodial workers and outside vendors of the existence and location of these materials and to set a policy for the
maintenance of these materials. The material is usually only required to be removed if it is significantly damaged, prior to demolition of the building or if it will be disturbed by renovation activities. 

  
 20 

 Repair - The restoration of damaged or deteriorated asbestos containing building materials to an intact
condition. Once the intact condition is established, the material should be included in an O&M program. The material is usually only required to be removed if it is significantly damaged, prior to demolition of the building or if it will be
disturbed by renovation activities. 
 Abate Due to Condition - This material is significantly damaged and is unsafe in its current condition. The access to
the area should be restricted to personnel equipped with appropriate personal protection. This material should be properly removed by a licensed contractor using workers trained in the safe removal of asbestos. 

Abate Prior to Renovation - This material should be properly removed prior to planned renovation activities by a licensed contractor using workers trained in
the safe removal of asbestos. This recommendation is usually made only on survey reports prepared prior to planned renovation activities. 
 Comments &
Damage Description contains any additional information and or specific details of material damage are noted here. 
 EPA Category provides the appropriate
material category as outlined in the NESHAPS regulation. The four options are friable, Category 1, Category 2, and needs determination. 
 Friable -
Materials containing greater than 1% asbestos are always considered Regulated Asbestos Containing Materials (RACM) that require removal prior to building renovation or demolition activities that impact the material. 

Category 1 - Materials that are bituminous non-friable and contain more than 1% asbestos that become RACM and require removal only when will be subject to
grinding, cutting, sanding or abrading. 

  
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 Appendix B 

Bulk Sampling Protocol and Analytical Methods 

  
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 Bulk Sampling Protocol and Analytical Methods 

Bulk samples of suspect asbestos containing building materials were obtained using standard industrial hygiene techniques including wetting the material to
minimize fiber release. Our personnel wore half-face air purifying respirators equipped with high efficiency particulate (HEPA) filters while obtaining samples 

Our sampling strategy for suspect friable surfacing materials was based on the guidelines outlined in the EPA publication Asbestos in Buildings: Simplified
Sampling Scheme for Friable Surfacing Materials, and the procedures outlined in 40 CFR 763, Subpart E (AHERA). For non-friable suspect materials, AHERA requires the building inspector to determine the appropriate number of samples to obtain and
analyze. Usually one to three samples of non-friable materials are collected. 
 For each homogeneous material identified by visual inspection as suspect
material, random samples are obtained. A single bulk sample is randomly selected from each homogeneous material for first-round testing. If the sample is positive, the remaining samples are not analyzed; if the sample is negative, the other samples
are submitted for study. Every sample must be reported negative if the material is to be considered non-asbestos containing. 
 The bulk samples were
delivered to an independent laboratory that participates in the bulk sample proficiency analysis program conducted by the United States Environmental Protection Agency and is accredited by the National Voluntary Laboratory Program (NVLAP). The
samples were analyzed using Polarized Light Microscopy (PLM) with dispersion staining to estimate the percent of asbestos composition by volume. Samples with no observable asbestiform minerals are designated as None-Detected. Samples in which
asbestiform minerals are observed, but exist in concentrations of less than one percent (<1%), are designated as present in Trace amounts; all other samples are designated as asbestos containing with the appropriate percent of asbestos noted.

  
 23 

 Appendix C 

Laboratory Bulk Sampling Reports 

  
 24 

 

 

  
 25 

 

 

  
 26 

 

 

  
 27 

 

 

  
 28 

 

 

  
 29 

 

 

  
 30 

 Appendix D 

Summary of Regulatory Requirements 

  
 31 

 Appendix D Summary of Regulatory Requirements 

This appendix provides a summary of building owner and manager requirements under various asbestos regulations promulgated by the Occupational Safety and
Health Administration (OSHA) and the Environmental Protection Agency (EPA) to protect building occupants and employees from exposure to asbestos. 
 Survey
Requirements 
 Prior to any renovation activity, OSHA and EPA regulations require that a complete asbestos survey be performed to determine if asbestos is
present in any suspect asbestos containing material that will be present in the construction or work area. This survey report addresses accessible materials. It is recommended that prior to renovation activities, inaccessible areas that could
contain asbestos materials be inspected. 
 Notification and Posting Requirements 

Regulatory agencies feel that the building owner or manager should be responsible for knowing and communicating the locations of asbestos in their buildings to
building employees, outside contractors and tenants to prevent exposure to asbestos. 
 Under the California Health and Safety Code, building owners and
managers are required to provide annual notifications regarding known asbestos containing materials in their buildings to building employees, tenants, vendors and outside contractors. Therefore, specific information contained in this survey report
is required to be included in the notification. 
 OSHA requires building employees, outside contractors, vendors and construction contractors bidding on or
performing work in buildings be provided with notification regarding asbestos containing materials in their work areas. OSHA also requires that asbestos warning signs be posted in mechanical rooms. 

Removal Requirements 
 Under EPA regulations, asbestos containing
materials must be properly removed by licensed asbestos abatement contractors prior to renovation or demolition activities that would disturb friable materials or cause non-friable materials to become friable and a regulated material. 

Repair of Damaged Materials and Cleanup of Debris 
 OSHA requires
that asbestos containing debris be immediately cleaned up. It is recommended that damaged materials that may release fibers be repaired as soon as possible to prevent fiber release and potential exposures. 

  
 32 

 Training Requirements 

OSHA requires employers whose employees are likely to or required to disturb asbestos to receive an asbestos training course. Refresher training is required to
be provided annually. 

  
 33 

 

 

  
 34 

 Table of Contents 
  

			
	 Section

		
		  	Executive Summary
		
	 1
	  	Introduction
		
	 2
	  	Scope of Services
		
	 3
	  	Methodology
		
	 4
	  	Findings and Observations
	
	 APPENDICES

		
	 A
	  	XRF- Data Results Tables
		
	 B
	  	Certification(s)
		
	 C
	  	Site Map
		
	 D
	  	Laboratory Results

  
 35 

 EXECUTIVE SUMMARY 

Benchmark Environmental Engineering was retained by PAI Corporation, to conduct a lead-based paint survey at Building 543, Merchandise Exchange Offices located
at Moffett Field, California. 
 In order to determine if lead based paint was present, three (3) paint chip samples were collected and 80 assays were taken
using an X-RAY FLUORESCENCE (XRF) instrument. The results indicated that the following building components were above the EPA and OHS level of 1.0 mg/ cm2 or 5000 PPM. 

Lead-based Paint was identified on the following building component: 
  

			
	Exterior:	  	Yellow Safety Paint.

  
 36 

 INTRODUCTION 

Benchmark Environmental Engineering was retained by Mr. Kris McGlothlin, to conduct a lead-based paint survey at NASA Ames-PAI Corporation, Moffett Field,
California. 
 Authorization to perform this survey was received via signed agreement to BENCHMARK from Mr. Kris McGlothlin, on or about May 1, 2001, as
referenced by BENCHMARK’S proposal E01-448. 
 BACKGROUND 

This facility is a one-story, 9,000 square foot structure. Built in 1973, it is concrete slab construction with metal exterior walls. The metal roof is flat
and the tan exterior is metal. 
 WARRANTY 
 Benchmark
Environmental Engineering warrants that the findings contained herein have been prepared with the level of care and skill exercised by experienced and knowledgeable environmental consultants who are appropriately licensed or otherwise trained to
perform lead-related construction risk assessments and inspections pursuant to the scope of work required on this Project. 
 The survey included inspection
of accessible materials. BENCHMARK did not inspect or sample inaccessible areas such as behind walls or within ductwork, and did not dismantle any part of the structure to survey inaccessible areas. For the purpose of this warranty, inaccessible is
defined as areas of the building that could not be tested (sampled) without destruction of the structure or a portion of the structure. Inaccessible materials that are not visible to Benchmark’s inspectors are assumed to be lead containing.

 Authorization to perform this survey was received by BENCHMARK from Mr. Kris McGlothlin, of The PAI Corporation, on May 1, 2001, as referenced by
Benchmark’s Proposal E01-488. 
 The survey was conducted on August 14, 2001. A comprehensive site survey was performed based on the building plan. All
building components identified in the specifications that may contain lead-based paint/coating were targeted for testing. (Exterior and interior walls, exterior and interior windows, doors and numerous associated components). 

Sampling protocol for identification of lead-based paint was in accordance with The U.S. Department of Housing and Urban Development (HUD) Guidelines for the
Evaluation and Control of Lead-Based Paint Hazards in Housing, Chapter 7. All suspect lead-coated surfaces were identified by building, wall, and building component, as such each component had a unique identification number. 

The report establishes lead concentrations in painted surfaces as a general guidance tool for the purpose of conducting renovation activities for Building
543. 

  
 37 

 A total of 80 XRF assays and three (3) paint chip samples were collected within this building. 

  
 38 

 SCOPE OF SERVICES 

Benchmark recognized the scope of work for the NASA Ames-PAI Corporation, to be composed of a Lead Based Paint Inspection for the Merchandise Exchange Offices
(ID: Building 543). The survey consisted of testing for lead-base paint in general accordance with the U.S Department of Housing and Urban Development (HUD) guidelines for the evaluation and control of Lead-Based Paint Hazards in Housing, Chapter 7.

 Certain building components that are adjacent to each other and not likely to have different painting histories have been grouped together into a single
testing combination, as follows: Window Casings/Stops/Jambs/Aprons -Or- Door Jambs/Stoops/Transoms/Casings and other door frame parts. 
 The following
building components were inspected when applicable: 
  

	•	 	Exterior Areas: 

  

			
	Walls	  	Windows
	Windowsills	  	Stair Handrails
	Doors	  	Door Molding
	Downspouts	  	Window Screen
	Building Trim	  	Skylight
	Balusters	  	Stair Handrail
	Stair Risers	  	Support Pillar

  

	•	 	Interior Areas: 

  

			
	Walls	  	Windows
	Windowsills	  	Stair Treads
	Balusters	  	Doors
	Door Molding	  	Stair Stringer
	Ceilings	  	Ceiling Molding
	Skylight	  	Floors
	Ceiling Molding	  	Grates
	Baseboards	  	Support Beams
	Electrical Box	  	Book Shelf
	Chair Rail	  	Wainscot

 Paint chip samples were collected from three (3) building components to provide conclusions that would be in compliance with
DOSH 8 CCR 1532.1. 

  
 39 

 METHODOLOGY 

GENERAL REFERENCES 
 Inspection, sampling, and assessment
procedures were performed in general accordance with the guidelines published by The Department of Housing and Urban Development’s (HUD) 1995 Guidelines, Chapter 7. The survey consisted of three major activities: visual inspection, sampling,
and analysis. Although these activities are listed separately, they are integrated tasks. 
 VISUAL INSPECTION 

An inspector that is a Department of Health Services Certified Lead Inspector/ Risk Assessor performed the inspection. An initial building walkthrough was
conducted to determine the presence of suspect materials that were accessible or exposed. 
 SAMPLING PROCEDURES 

Following the walkthrough, the inspector selected samples areas of exposed or accessible materials identified as suspect LBP. EPA and HUD guidelines were used
to determine the sampling protocol. Sampling locations were chosen to be representative of the homogeneous material. 
 X-RAY FLUORESCENCE (XRF) ANALYSIS

 XRF instruments measure lead in paint by directing high energy X-rays and gamma rays into the paint, causing the lead atoms in the paint to emit X-rays
which are detected by the instrument and converted to a measurement of the amount of lead in the paint. The EPA approved technology allows for measurement of X-rays without scraping or samples preparation to characterize substrate or matrix effects.
The Spectrum Analyzer, Metals Analysis Probe (MAP 4) is combined with a microprocessor system that enables field-testing with a high degree of quality control and speed. Sample locations, descriptions, conditions, and measurement results are
automatically recorded by the instrument and easily downloaded to a PC or laptop. 

  
 40 

 QUALITY CONTROL PROGRAM 

Benchmark Environmental Engineering utilizes only DHS approved inspectors, which are certified to use radioactive instruments. The MAP 4 Spectrum Analyzer has
on-board calibration routines, which continuously operate, and self-correct to minimize sampling error. This is known as substrate correcting software. 

PAINT CHIP SAMPLE COLLECTION 
 A total of three (3) paint chip
samples were collected in accordance with the HUD Evaluation and Control of Lead-Based Paint Hazards in Housing, Paint Chip Sampling. A two-inch by two-inch area was measured and delineated. The paint chip sample was collected with the use of a
sharp stainless steel paint scraper. Paint was scraped directly off the substrate. The goal is remove all layers of paint equally, but none of the substrate. Paint chip samples collected in this fashion are reported in PPM or % by weight. 

LEAD 
 Laboratory analysis was performed by Schneider
Laboratories, Inc. Their AIHA Accredited Laboratory Identification Number is AIHA/ELLAP #100527, and CA ELAP #2078. Samples are analyzed by Flame Atomic Absorption in accordance with EPA’s “Standard Operating Procedures for Lead in Paint
by Hotplate or Microwave based Acid digestions and Atomic Absorption or Inductively Coupled Plasma Emission Spectrometry” (1991), EPA/600/8-91/213, NTIS Document No. PB92-114172. Samples are prepared by hotplate digestion with nitric acid and
hydrogen peroxide, and analyzed by Flame AA. 
 LABORATORY QUALITY CONTROL PROGRAM 

Schneider Laboratories, Inc. maintains an in-house quality control program. This program involves blind reanalysis of ten percent of all samples, precision and
accuracy controls, and use of standard bulk reference materials. 

  
 41 

 FINDINGS AND OBSERVATIONS 

LEAD 
 A total of 80 assays were taken. The results indicated that
1 assay contained lead above the EPA and OHS level of 1.0 mg/ cm2 or greater. The components, which contain lead-based paint, are: 
 Exterior: Yellow Safety
Paint. 
 Cal/OSHA’s Lead in Construction Standard, Title 8, CCR section 1532.1, is primarily concerned with worker protection when disturbing any
detectable level of lead in paint or surface coatings. 
 Assays with results less than 1.0 mg/cm2 and paint chip samples with results less than 5000 ppm
may create hazardous conditions if subjected to poor and/or prohibited work practices. Refer to Work Activities on the following page. 
 OSHA LEAD
REGULATION SUMMARY 
 The Federal Occupational Safety and Health Administration (OSHA) has enacted an interim lead standard, which was adopted by Cal/OSHA as
8 CCR 1532.1. The purpose of both standards is to protect construction workers from exposure to lead. OSHA is primarily concerned with activities that disturb lead-containing material. Lead was used in most paints until the mid 1950’s and was
banned in amounts in excess of 0.06% by weight in 1978 for most non-industrial paints by the Consumer Product Safety Commission (CPSC). 
 The new standard
requires contractors and employers who perform activities that would disturb lead, must monitor their employees to determine whether they are being exposed in excess of the Action Level (AL) of 30 micrograms per cubic meter of air (ug/m3) over an
eight-hour time weighted average (TWA) or the Permissible Exposure Limit (PEL) of 50 ug/m3 TWA. Monitoring is performed by personal exposure air sampling. 

Even when concentrations are below the AL, an employer must provide employees with High Efficiency Particulate Air (HEPA) filtered vacuums, wetting agents and
hand-washing facilities. If the exposure exceeds the AL or the PEL, other procedures such as containing the area, decontamination facilities and medical monitoring are required. 

OSHA has identified several activities that pose varying levels of potential lead exposure to laborers disturbing lead-containing paint. Estimated exposure
levels of lead are founded on the activity itself, rather than the concentrations of lead present in paint. Therefore, as an example, paints that contain 0.5% versus 15% of lead by weight or 0.8 mg/cm2 versus 3.5 mg/cm2 of lead in paint could
present the same levels of potential exposure to workers depending on the activities that cause the disturbance and the administrative and engineering controls that are followed. 

  
 42 

 The following is a summary of work activities that disturb paint, the expected exposures and the respiratory
protection requirements as outlined in the OSHA standards: 
 Class I Activities: 
  

			
	Class I activities include:	  	Manual demolition, manual scraping, manual sanding, heat gun application, general cleanup, power tool cleaning with dust collection systems and spray painting activities.
		
	Potential Exposure:	  	50 ug/m3 to 500 ug/m3
		  	Minimum Respiratory Protection: Half mask air purifying respirator equipped with HEPA filters having a protection factor of 10.
		
	Class II Activities:	  	
		
	Class II activities include:	  	Using lead-containing mortars, lead burning, lead riveting, rivet busting, power tool cleaning without dust collection systems, cleanup of dry expendable abrasives and abrasive blasting.
		
	Potential Exposure:	  	500 ug/m3 to 2,500 ug/m3
		  	Minimum Respiratory Protection: Full face powered air-purifying respirators equipped with HEPA filters having a protection Factor of 100.
		
	Class III Activities:	  	
		
	Class II activities include:	  	Abrasive blasting, welding, cutting and torch burning on steel structures.
		
	Potential Exposure:	  	Greater than 2,500 ug/m3
		  	Minimum Respiratory Protection: Full face supplied - air respirator operated in pressure demand mode or - the positive pressure mode.

 DOSH 8 CCR 1532.1 requires that an initial exposure assessment be performed if workers will be performing any of the trigger
tasks found in 1532.1. It should be noted that the California Department of Health Services (OHS) has issued emergency work procedures for lead paint materials that in the absence of any other procedures are recommendations. 

  
 43 

 The following recommendations are general site specific work practice specifications. 

 

	•	 	You must use “containment” when you sand, scrape, or disturb any detectable level of lead in paint or surface coatings. 

  

	•	 	Containment is required for abatement and/or any activity that or disturb any detectable level of lead in paint or surface coatings. 

 

	•	 	You must be OHS-certified (workers, supervisors, monitors, and inspectors) if you are conducting abatement. 

  

	•	 	You must follow an abatement plan. 

  

	•	 	A OHS -certified supervisor, monitor, and/or project designer must design an abatement project. 

  

	•	 	A clearance inspection by dust wipe sampling is required for abatement. 

 RESULTS OF THE PAINT
CHIP SAMPLES COLLECTED 
 Paint Chip Samples 

NASA Ames-PAI Corporation 
 August
14, 2001 
  

													
	 Sample Number
	  	 Component
	  	 Location
	  	 PPM
	 	  	
% By Weight
	 
	01-4740-543-1	  	Door	  	Interior	  	 	<70	 	  	 	<0.007	 
	01-4741-543-2	  	Ceiling	  	Ceiling	  	 	40	 	  	 	0.004	 
	01-4742-543-3	  	Wall 4	  	Exterior Siding	  	 	<50	 	  	 	<0.005	 

 LEAD WASTE DISPOSAL 
 The visual
determination indicated that all building components that tested positive were in intact to poor condition (minor cracking to flaking and peeling). As such, these components need to be considered a lead hazard if flaking paint is not stabilized. All
small debris (paint chips, rags, filters, and components smaller that 2”x2”) that may be generated during the paint stabilization process (paint preparation) should be considered Class I, lead hazardous waste. The debris generated from
paint stabilization of LBP building components should be segregated from all other dust and debris. Building components, which tested positive, should be stabilized by a OHS-accredited Contractor. 

Power washing may be conducted on the building. Run off water must be collected and analyzed by an accredited laboratory to meet the criteria established by
the Clean Water Act, Resource Conservation and Recovery Act (RCRA 1972). Lead levels must not exceed 5mg/L. 

  
 44 

 CODES AND REGULATIONS LEAD-BASED PAINT 

Federal and state regulations, which govern lead-based, paint work or hauling and disposal of lead-based paint waste materials include but are not limited to
the following: 
 FEDERAL 
 Housing and Urban Development (HUD)
1995 Guidelines For The Evaluation and Control of 
 Lead-Based Paint in Housing 

OSHA 
 Lead In Construction 

29 CFR 1926.62 
 NESHAP 

Emissions Standards 
 40 CFR 50.12 

Lead-Based Paint Poisoning Prevention Act (LBPPPA), 1970. 

Title 10 - Residential LBP Hazard Reduction Act, 1992, (amendment for LBPPPA, 1970) 

Resource Conservation Recovery Act (RCRA) 
 STATE 

Cal/OSHA 
 Lead In Construction 

Title 8 CCR 1532.1 
 Department of Health Services (DHS) 

Emergency Work Practice Regulations 
 Title 17 CCR, Division 1,
Chp. 

  
 45 

 APPENDIX A 

XRF - DATA RESULTS TABLE 

  
 46 

 

 

  
 47 

 

 

  
 48 

 

 

  
 49 

 APPENDIX B 

CERTIFICATION(S) 

  
 50 

 APPENDIX C 

SITE MAP 

  
 51 

 APPENDIX D 

LABORATORY RESULTS 

  
 52 

 

 

  
 53 

 

 

  
 54 

 SCOPE OF SERVICES 

Benchmark Environmental Engineering (Benchmark) was retained by PAI Corporation to provide a visual (only) evaluation on Building 543 of Moffett Field.
Authorization to perform this consultation was received via written Agreement from PAI Corporation on August 1, 2001 
 Benchmark conducted a site visit on
January 10, 2002. 
 Background: 
 There has not been a
microbial investigation performed on this building. 
 Report: 

The following report is defined in two sections: 
 Discoloration
and Visible Mold. 

  
 55 

 

 

  
 56 

 

 
  

 

 

 Table of Contents 
  

			
	Section:
		
		  	Executive Summary
		
	1	  	Introduction
		
	2	  	Description of Building Construction and Systems
		
	3	  	Summary of Findings for Suspect Materials
		
	4	  	Material Information Tables
		
	5	  	Removal Cost Estimate Summary
	
	Appendices:
		
	A	  	Definition of Terms and Assessment Criteria
		
	B	  	Bulk Sampling Protocol and analytical Methods
		
	C	  	Laboratory Bulk Sampling Reports
		
	D	  	Summary of Regulatory Requirements
		
	E	  	AHERA Building Inspector Certifications
		
	F	  	Drawings Indicating Material Locations

  
 2 

 Executive Summary 

Benchmark Environmental Engineering (Benchmark) was retained by NASA - Ames (PAI Corporation) to perform an Asbestos Hazard Emergency Response Act (AHERA)
style asbestos survey of the Army Reserve Center 4 (Building ID: Building154), to determine the locations of accessible and to the extent feasible, inaccessible friable and non-friable asbestos containing building materials (ACBM). 

This inspection included interior and exterior areas. Pre-existing survey data was used to help provide a picture of existing conditions of this
building. Benchmark collected additional samples of the construction material to help supplement existing data, to contradict existing data or to provide additional data of materials not previously identified. 

The entire interior of the building has been remodeled and all pre-existing materials have been removed and replaced with non-ACM material. 

No friable asbestos-containing materials were observed in the building. 

Asbestos was detected in the following non-friable materials: 

Sink Undercoating 
 The following materials were
assumed to contain asbestos: 
 Fire Door 

  

			
	Site ID: 3-15 Yrs.	  	
	 Building ID: Army Reserve Center 4
	  	Executive Summary Page 1
	 Asbestos Survey Report
	  	

 Section 1 Introduction 

Benchmark Environmental Engineering (Benchmark) performed an Asbestos Hazard Emergency Response Act (AHERA) style asbestos survey of the Army Reserve
Center 4 located at Moffett Field, Mountain View, CA, to identify ACBM. This report identifies the locations and asbestos content of friable and non-friable ACBM, provides assessment of the friable ACBM in relation to the material’s
hazard potential to building occupants and provides removal cost estimates. 
 This inspection included interior and exterior areas. Pre-existing
survey data was used to help provide a picture of existing conditions of this building. Benchmark collected additional samples of the construction material to help supplement existing data, to contradict existing data or to provide additional
data of materials not previously identified. 
 The entire interior of the building has been remodeled and all pre-existing materials have been removed and
replaced with non-ACM material. 
 All identified suspect asbestos-containing materials are summarized in Section 3. Materials testing positive for asbestos
including material assessments, recommended response actions, and quantities are described in Section 4. Removal cost estimates for asbestos-containing materials are included in Section 5. 

Removal cost estimates (Section 5) are for budgeting purposes only and should not be used as a quote for removal of the materials. It is not our
recommendation to remove these materials unless they are beyond repair, or planned demolition or renovation activities will disturb the materials. Estimates are based on recent pricing we have received from contractors performing similar work
and may vary from actual prices obtained due to the actual scope of work, quantity of material removed, control measures specified and contractor work loads. 

On Friday, November 2, 2001 Terri MacFarlane ( 90-2747 ) , a California Certified Asbestos Consultant and Roy J. Mabus 

( 92-0191 ) , a California Certified Asbestos Consultant, from Benchmark, performed an asbestos survey of the building(s) in accordance with the Asbestos
Hazard and Emergency Response Act of 1987 (AHERA). 
 DISCLAIMER 

This report is prepared for the express use and benefit of NASA - Ames (PAI Corporation), its agents and employees. The information in this report or
portions thereof may be required to be included in notifications to employees, contractors or other visitors to the building(s). This report is not intended to be used as a specification or work plan for any of the work suggested or recommended
in this report. 

  

			
	Site ID: 3-15 Yrs.	  	
	 Building ID: Army Reserve Center 4
	  	Section 1 Page 1
	 Asbestos Survey Report
	  	

 This report is based upon conditions observed at the property and information made available to the
surveyor. This report does not intend to identify all hazards or unsafe conditions, nor to indicate that other hazards or unsafe conditions do not exist at the premises. 

  

			
	Site ID: 3-15 Yrs.	  	
	 Building ID: Army Reserve Center 4
	  	Section 1 Page 2
	 Asbestos Survey Report
	  	

 Section 2 Description of Building Construction and Systems 

 

					
	Number of Floors: 3	  	Year Built: 1953	  	Total Square Footage: 9,285

			
		
	Structural components consist of:	 	Concrete Foundation
		
	Exterior Wall construction components consist of:	 	Concrete
		
	Interior Wall construction components consist of:	 	Drywall
		
	Interior ceiling components consist of:	 	Ceiling Tile

 Building Description/Comments: 

This is a two-story structure with a basement. Built in 1953, the building construction is concrete over a concrete foundation and with a flat composite
roof. The concrete exterior is tan. 
 Comments: 
 There
was a previous asbestos survey done by Tetra Tech, Inc. on January 19, 1993. 

  

			
	Site ID: 3-15 Yrs.	  	
	 Building ID: Army Reserve Center 4
	  	Section 2 Page 1
	 Asbestos Survey Report
	  	

 Section 3 Summary of Findings for Suspect Materials 

The following table is a list of all materials at this building which were tested for the presence of asbestos or were assumed to contain asbestos along with
overall sample results. Complete information on asbestos containing materials is included in Section 4 of this report. 
 Each unique material within
the building is assigned a unique HM number by the surveyor at the time the survey is performed. 
 Section 3 and Section 4 are organized by building,
surfacing, thermal systems insulation, flooring, walls, ceilings, roofing and miscellaneous materials. 
  

			
	Site Information	  	Client Information
	Army Reserve Center 4 (Site ID: 3-15 Yrs.)	  	NASA - Ames (PAI Corporation)
	Moffett Field	  	NASA-Ames Research Center
	Mountain View, CA 94035	  	Mt. View, CA 94035-1000

  

							
	Survey Performed By	  	Inspector	  	Inspection Date	  	Job Number
	Benchmark Environmental Engineering	  	Terri MacFarlane	  	Friday, November 2, 2001	  	E01-612-A-SU

  

									
	 Suspect Material
	  	 Category
	  	 HM Number
	  	 Material Location(s)
	  	 Asbestos Present?

	Roofing Material	  	Roofing	  	RM-2	  		  	No

  

			
	Site ID: 3-15 Yrs.	  	
	 Building ID: Army Reserve Center 4
	  	Section 3 Page 1
	 Asbestos Survey Report
	  	

 Section 4 Material Information Tables 

 

			
	Site Information	 	Client Information
	Army Reserve Center 4 (Site ID: 3-15 Yrs.)	 	NASA - Ames (PAI Corporation)
	Moffett Field	 	NASA-Ames Research Center
	Mountain View, CA 94035	 	Mt. View, CA 94035-1000

  

							
	Survey Performed By	  	Inspector	  	Inspection Date	  	Job Number
	Benchmark Environmental Engineering	  	Terri MacFarlane	  	Friday, November 2, 2001	  	E01-612-A-SU

  
 

 

  

			
	Site ID: 3-15 Yrs.	  	
	 Building ID: Army Reserve Center 4
	  	Section 4 Page 1
	 Asbestos Survey Report
	  	

 Appendix A 

Definitions of Terms and Assessment Criteria 

 Definitions of Terms and Assessment Criteria 

This survey report organizes information on each suspect ACBM identified in tables located in Section 4. This section describes how to interpret the data
found on materials listed in Section 4. 
 Material description contains the description of the suspect homogeneous asbestos containing building
material. 
 Material Serial Number is used to reference the material for reinspections, etc. 

Asbestos type and content describes the type of asbestos and its percentage in the material. 

Asbestos Results for positive materials are shown as a percentage. Samples having less than 1% asbestos are reported as containing “Trace”
amounts of asbestos and samples with no detected asbestos are reported as “BLD” or below limit of detection. 
 Sample number(s) identifies
a particular material sample obtained from a specific sample location. Sample numbers are used primarily for laboratory identification. 
 Sample
Location identifies where the samples of this material were obtained. 
 Material Category categorizes each material as surfacing, TSI or
miscellaneous. 
 Surfacing Materials - Asbestos containing materials that are sprayed-on, trawled-on or otherwise applied to surfaces, such as
acoustical plaster on ceilings and fireproofing on structural members, or other materials on surfaces for acoustical, fireproofing, or other purposes. 

Thermal Systems Insulation (TSI) - Asbestos containing materials applied to pipes, fittings, boilers, breaching, tanks, ducts or other interior
structural components to prevent heat loss or gain or water condensation. 
 Miscellaneous Materials - Asbestos containing materials applied to or a
part of building components that are not classified as surfacing materials or thermal systems insulation. 
 Quantity & Units reports approximate
total quantity per unit of measure for each material. Building(s) & Floor(s) specifies where a material is located. 
 Material Location
describes where the material is found throughout the building. 
 Material Condition identifies the material as Friable, Non-friable or Jacketed (for
thermal systems insulation only) if asbestos is present. 
 Friable - An asbestos containing material that can be crumbled, pulverized or reduced to
powder, when dry, by hand pressure, such as spray applied fireproofing on structural steel members, spray applied acoustical ceiling materials or damaged thermal systems insulation. Friable materials are of greatest concern due to their
potential fiber release. 

 Non-Friable - An asbestos containing material where the asbestos is bound tightly in a matrix or sealed by
a protective layer. Non-friable materials can become friable by being rendered to a crumbled, pulverized or powdered state, when dry, by crushing, sanding, sawing, shot-blasting, severe weathering or by other mechanically induced means. Common
examples of non-friable materials are adhesives, floor tiles, transite and roofing materials. 
 Jacketed - An asbestos containing material applied
to thermal systems insulation and “jacketed” with a protective outer layer such as canvas or metal to keep the material in good condition. Undamaged jacketed ACBM is considered non-friable. If the jacketing is damaged, the material is
considered friable. 
 Damage Category describes the type of damage, if any, to the material. The following damage categories are used: None,
Physical, Air, and Water. 
 Material Assessment identifies the condition of the material in relation to physical and water damage, delamination of
the material from its substrate, the extent of the damage and the potential for damage from building conditions, such as, accessibility by building occupants, influence of vibration, etc. The six standard assessment categories ranked by hazard
potential, with the first being the lowest hazard are as follows: 1) Potential for Damage, 2) Potential for Significant Damage, 3) Damaged, 4) Damaged with Potential for Damage, 5) Damaged with Potential for Significant Damage, and 6)
Significantly Damaged. Only friable materials are assessed under AHERA regulations. Non-friable materials, unless damaged, are not assessed and can be assumed to be in good condition. 

Damaged - The damage or deterioration of the material results in inadequate cohesion or adhesion with crumbling, blistering, water stains, marring or
otherwise abraded over less than on-tenth (1/10) of the surface if the damage is evenly distributed or one-fourth (1/4) if the damage is localized. 

Significant Damage - The damage or deterioration of the material results in inadequate adhesion or cohesion and the damage is extensive and severe with
one or more of the following characteristics: 1) Crumbling or blistering over at least one-tenth (1/1O) of the surface if evenly distributed, one-fourth (1/4) if the damage is localized; 2) Areas of the material hanging from the surface,
delaminated, or showing adhesive failure; 3) Water stains, gouges or marred. 
 Recommended Response suggests the appropriate options for controlling
or maintaining ACBM in a safe manner. There are four options used: 
 Operations & Maintenance (O&M) - A program designed to
“manage” asbestos in-place. As long as asbestos containing materials remain in a building, an O&M program should be instituted to alert maintenance personnel, custodial workers and outside vendors of the existence and location of these
materials and to set a policy for the maintenance of these materials. The material is usually only required to be removed if it is significantly damaged, prior to demolition of the building or if it will be disturbed by renovation activities. 

Repair - The restoration of damaged or deteriorated asbestos containing building materials to an intact condition. Once the intact condition is
established, the material should be 

 
included in an O&M program. The material is usually only required to be removed if it is significantly damaged, prior to demolition of the building or if it will be disturbed by renovation
activities. 
 Abate Due to Condition - This material is significantly damaged and is unsafe in its current condition. The access to the area
should be restricted to personnel equipped with appropriate personal protection. This material should be properly removed by a licensed contractor using workers trained in the safe removal of asbestos. 

Abate Prior to Renovation - This material should be properly removed prior to planned renovation activities by a licensed contractor using workers
trained in the safe removal of asbestos. This recommendation is usually made only on survey reports prepared prior to planned renovation activities. 

Comments & Damage Description contains any additional information and or specific details of material damage are noted here. 

EPA Category provides the appropriate material category as outlined in the NESHAPS regulation. The four options are friable, Category 1, Category 2,
and needs determination. 
 Friable - Materials containing greater than 1% asbestos are always considered Regulated Asbestos Containing Materials (RACM)
that require removal prior to building renovation or demolition activities that impact the material. 
 Category 1 - Materials that are bituminous
non-friable and contain more than 1% asbestos that become RACM and require removal only when will be subject to grinding, cutting, sanding or abrading. 

 Appendix B 

Bulk Sampling Protocol and Analytical Methods 

 

 
  

 Bulk Sampling Protocol and Analytical Methods 

Bulk samples of suspect asbestos containing building materials were obtained using standard industrial hygiene techniques including wetting the material to
minimize fiber release. Our personnel wore half-face air purifying respirators equipped with high efficiency particulate (HEPA) filters while obtaining samples 

Our sampling strategy for suspect friable surfacing materials was based on the guidelines outlined in the EPA publication Asbestos in
Buildings: Simplified Sampling Scheme for Friable Surfacing Materials, and the procedures outlined in 40 CFR 763, Subpart E (AHERA). For non-friable suspect materials, AHERA requires the building inspector to determine the appropriate
number of samples to obtain and analyze. Usually one to three samples of non-friable materials are collected. 
 For each homogeneous material identified by
visual inspection as suspect material, random samples are obtained. A single bulk sample is randomly selected from each homogeneous material for first-round testing. If the sample is positive, the remaining samples are not analyzed; if the
sample is negative, the other samples are submitted for study. Every sample must be reported negative if the material is to be considered non-asbestos containing. 

The bulk samples were delivered to an independent laboratory that participates in the bulk sample proficiency analysis program conducted by the United States
Environmental Protection Agency and is accredited by the National Voluntary Laboratory Program (NVLAP). The samples were analyzed using Polarized Light Microscopy (PLM) with dispersion staining to estimate the percent of asbestos composition by
volume. Samples with no observable asbestiform minerals are designated as None-Detected. Samples in which asbestiform minerals are observed, but exist in concentrations of less than one percent (<1%), are designated as present in Trace amounts;
all other samples are designated as asbestos containing with the appropriate percent of asbestos noted. 

 Appendix C 

Laboratory Bulk Sampling Reports 

 Appendix D 

Summary of Regulatory Requirements 

 Appendix D Summary of Regulatory Requirements 

This appendix provides a summary of building owner and manager requirements under various asbestos regulations promulgated by the Occupational Safety and
Health Administration (OSHA) and the Environmental Protection Agency (EPA) to protect building occupants and employees from exposure to asbestos. 

Survey Requirements 
 Prior to any renovation activity,
OSHA and EPA regulations require that a complete asbestos survey be performed to determine if asbestos is present in any suspect asbestos containing material that will be present in the construction or work area. This survey report addresses
accessible materials. It is recommended that prior to renovation activities, inaccessible areas that could contain asbestos materials be inspected. 

Notification and Posting Requirements 
 Regulatory
agencies feel that the building owner or manager should be responsible for knowing and communicating the locations of asbestos in their buildings to building employees, outside contractors and tenants to prevent exposure to asbestos. 

Under the California Health and Safety Code, building owners and managers are required to provide annual notifications regarding known asbestos containing
materials in their buildings to building employees, tenants, vendors and outside contractors. Therefore, specific information contained in this survey report is required to be included in the notification. 

OSHA requires building employees, outside contractors, vendors and construction contractors bidding on or performing work in buildings be provided with
notification regarding asbestos containing materials in their work areas. OSHA also requires that asbestos warning signs be posted in mechanical rooms. 

Removal Requirements 
 Under EPA regulations, asbestos
containing materials must be properly removed by licensed asbestos abatement contractors prior to renovation or demolition activities that would disturb friable materials or cause non-friable materials to become friable and a regulated material.

 Repair of Damaged Materials and Cleanup of Debris 

OSHA requires that asbestos containing debris be immediately cleaned up. It is recommended that damaged materials that may release fibers be repaired as soon
as possible o prevent fiber release and potential exposures. 
 Training Requirements 

OSHA requires employers whose employees are likely to or required to disturb asbestos to receive an asbestos training course. Refresher training is required to
be provided annually. 

 Appendix E 

AHERA Building Inspector Certifications 

 Appendix F 

Drawings Indicating Sampling Locations 

 

 

 Section 

Executive Summary 
  

	 	1	Introduction 

  

	 	2	Scope of Services 

  

	 	3	Methodology 

  

	 	4	Findings and Observations 

 Appendices 

 

	 	A	XRF-Data Results Tables 

  

	 	B	Certification(s) 

  
 1 

 EXECUTIVE SUMMARY 

Benchmark Environmental Engineering was retained by PAI Corporation, to conduct a lead-based paint survey at Building located at Moffett Field, California.

 In order to determine if lead based paint was present, 188 assays were taken using an X-RAY FLUORESCENCE (XRF) instrument. The results indicated that the
following building components were above the EPA and OHS level of 1.0 mg/ cm2 or 5000 PPM. 
 Lead-based Paint was identified on the following building
components: 
 Exterior: 
  

	•	 	Door Frame, Fixed Window Panel, Window Sill, Stair Riser. 

 Interior: 

 

	•	 	Basement Stairwell - Handrail. 

  

	•	 	Stairwell at Room 121 - Door Frame. 

  
 2 

 INTRODUCTION 

Benchmark Environmental Engineering was retained by Mr. Kris McGlothlin, to conduct a lead-based paint survey at NASA Ames-PAI Corporation, Moffett Field,
California. 
 Authorization to perform this survey was received via signed agreement to BENCHMARK from Mr. Kris McGlothlin, on or about August 1, 2001, as
referenced by BENCHMARK’S proposal E01-612. 
 BACKGROUND 

This structure is a two-story facility with a basement. It was built in 1953. The construction is concrete over a concrete foundation and with a flat composite
roof. 
 WARRANTY 
 Benchmark Environmental Engineering
warrants that the findings contained herein have been prepared with the level of care and skill exercised by experienced and knowledgeable environmental consultants who are appropriately licensed or otherwise trained to perform lead-related
construction risk assessments and inspections pursuant to the scope of work required on this Project. 
 The survey included inspection of accessible
materials. BENCHMARK did not inspect or sample inaccessible areas such as behind walls or within ductwork, and did not dismantle any part of the structure to survey inaccessible areas. For the purpose of this warranty, inaccessible is defined as
areas of the building that could not be tested (sampled) without destruction of the structure or a portion of the structure. Inaccessible materials that are not visible to Benchmark’s inspectors are assumed to be lead containing. 

Authorization to perform this survey was received by BENCHMARK from Mr. Kris McGlothlin, of The PAI Corporation, on August 1, 2001, as referenced by
Benchmark’s Proposal E01-612. 
 The survey was conducted in February of 2002. A comprehensive site survey was performed based on the building plan.
All building components identified in the specifications that may contain lead-based paint/coating were targeted for testing. (Exterior and interior walls, exterior and interior windows, doors and numerous associated components). 

Sampling protocol for identification of lead-based paint was in accordance with The U.S. Department of Housing and Urban Development (HUD) Guidelines for the
Evaluation and Control of Lead-Based Paint Hazards in Housing, Chapter 7. All suspect lead-coated surfaces were identified by building, wall, and building component, as such each component had a unique identification number. 

The report establishes lead concentrations in painted surfaces as a general guidance tool for the purpose of conducting demolition activities for Building
154. 
 A total of 188 XRF assays collected within this building. 

  
 3 

 SCOPE OF SERVICES 

Benchmark recognized the scope of work for the NASA Ames-PAI Corporation, to be composed of a Lead Based Paint Inspection for the Army Reserve Center 4 (ID:
Building 154). The survey consisted of testing for lead-base paint in general accordance with the U.S Department of Housing and Urban Development (HUD) guidelines for the evaluation and control of Lead-Based Paint Hazards in Housing, Chapter 7. 

Certain building components that are adjacent to each other and not likely to have different painting histories have been grouped together into a single
testing combination, as follows: Window Casings/Stops/Jambs/Aprons -Or- Door Jambs/Stops/Transoms/Casings and other door frame parts. 
 The
following building components were inspected when applicable: 
  

	•	 	Exterior Areas: 

  

			
	 Walls
	  	Windowsills
	 Doors
	  	Downspouts
	 Building Trim
	  	Balusters
	 Stair Risers
	  	Windows
	 Stair Handrails
	  	Door Molding
	 Window Screen
	  	Skylight
	 Stair Handrail
	  	Support Pillar

  

	•	 	Interior Areas: 

  

			
	 Walls
	  	Windowsills
	 Balusters
	  	Door Molding
	 Ceilings
	  	Skylight
	 Ceiling Molding
	  	Baseboards
	 Electrical Box
	  	Chair Rail
	 Windows
	  	Stair Treads
	 Doors
	  	Stair Stringer
	 Ceiling Molding
	  	Floors
	 Grates
	  	Support Beams
	 Book Shelf
	  	Wainscot

  
 4 

 METHODOLOGY 

GENERAL REFERENCES 
 Inspection, sampling, and assessment
procedures were performed in general accordance with the guidelines published by The Department of Housing and Urban Development’s (HUD) 1995 Guidelines, Chapter 7. The survey consisted of three major activities: visual inspection, sampling,
and analysis. Although these activities are listed separately, they are integrated tasks. 
 VISUAL INSPECTION 

An inspector that is a Department of Health Services Certified Lead Inspector/ Risk Assessor performed the inspection. An initial building walkthrough was
conducted to determine the presence of suspect materials that were accessible or exposed. 
 SAMPLING PROCEDURES 

Following the walkthrough, the inspector selected samples areas of exposed or accessible materials identified as suspect LBP. EPA and HUD guidelines were used
to determine the sampling protocol. Sampling locations were chosen to be representative of the homogeneous material. 
 X-RAY FLUORESCENCE (XRF) ANALYSIS

 XRF instruments measure lead in paint by directing high energy X-rays and gamma rays into the paint, causing the lead atoms in the paint to emit
X-rays which are detected by the instrument and converted to a measurement of the amount of lead in the paint. The EPA approved technology allows for measurement of X-rays without scraping or samples preparation to characterize substrate or matrix
effects. The Spectrum Analyzer, Metals Analysis Probe (MAP 4) is combined with a microprocessor system that enables field-testing with a high degree of quality control and speed. Sample locations, descriptions, conditions, and measurement results
are automatically recorded by the instrument and easily downloaded to a PC or laptop. 
 QUALITY CONTROL PROGRAM 

Benchmark Environmental Engineering utilizes only OHS approved inspectors, which are certified to use radioactive instruments. The MAP 4 Spectrum Analyzer has
on-board calibration routines, which continuously operate, and self-correct to minimize sampling error. This is known as substrate correcting software. 

  
 5 

 FINDINGS AND OBSERVATIONS 

LEAD 
 A total of 188 assays were taken. The results
indicated that seven (?)assays contained lead above the EPA and OHS level of 1.0 mg/ cm2 or greater. The components, which contain lead-based paint, are: 

Exterior: 
  

	•	 	Door Frame, Fixed Window Panel, Window Sill, Stair Riser. 

 Interior: 

 

	•	 	Basement Stairwell - Handrail. 

  

	•	 	Stairwell at Room 121 - Door Frame. 

 Cal/OSHA’s Lead in Construction Standard, Title 8, CCR section
1532.1, is primarily concerned with worker protection when disturbing any detectable level of lead in paint or surface coatings. 
 Assays with results less
than 1.0 mg/cm2 and paint chip samples with results less than 5000 ppm may create hazardous conditions if subjected to poor and/or prohibited work practices. Refer to Work Activities on the following page. 

OSHA LEAD REGULATION SUMMARY 
 The Federal Occupational
Safety and Health Administration (OSHA) has enacted an interim lead standard, which was adopted by Cal/OSHA as 8 CCR 1532.1. The purpose of both standards is to protect construction workers from exposure to lead. OSHA is primarily concerned with
activities that disturb lead-containing material. Lead was used in most paints until the mid 1950’s and was banned in amounts in excess of 0.06% by weight in 1978 for most non-industrial paints by the Consumer Product Safety Commission (CPSC).

 The new standard requires contractors and employers who perform activities that would disturb lead, must monitor their employees to determine whether
they are being exposed in excess of the Action Level (AL) of 30 micrograms per cubic meter of air (ug/m3) over an eight-hour time weighted average (TWA) or the Permissible Exposure Limit (PEL) of 50 ug/m3 TWA. Monitoring is performed by
personal exposure air sampling. 
 Even when concentrations are below the AL, an employer must provide employees with High Efficiency Particulate Air (HEPA)
filtered vacuums, wetting agents and hand-washing facilities. If the exposure exceeds the AL or the PEL, other procedures such as containing the area, decontamination facilities and medical monitoring are required. 

OSHA has identified several activities that pose varying levels of potential lead exposure to laborers disturbing lead-containing paint. Estimated
exposure levels of lead are founded on the activity itself, rather than the concentrations of lead present in paint. Therefore, as an 

  
 6 

 
example, paints that contain 0.5% versus 15% of lead by weight or 0.8 mg/cm2 versus 3.5 mg/cm2 of lead in paint could present the same levels of potential exposure to workers depending on the
activities that cause the disturbance and the administrative and engineering controls that are followed. 
 The following is a summary of work activities
that disturb paint, the expected exposures and the respiratory protection requirements as outlined in the OSHA standards: 
  

			
	 Class I Activities:
	  	 
	Class I activities include:	  	Manual demolition, manual scraping, manual sanding, heat gun application, general cleanup, power tool cleaning with dust collection systems and spray painting activities.
		
	Potential Exposure:	  	 50 ug/m3 to 500 ug/m3

Minimum Respiratory Protection: Half mask air purifying respirator equipped with HEPA filters having a protection factor of 10.

		
	 Class II Activities:
	  	 
		
	Class II activities include:	  	Using lead-containing mortars, lead burning, lead riveting, rivet busting, power tool cleaning without dust collection systems, cleanup of dry expendable abrasives and abrasive blasting.
		
	Potential Exposure:	  	 500 ug/m3 to 2,500 ug/m3

 
 Minimum Respiratory Protection: Full face powered air-purifying respirators
equipped with HEPA filters having a protection Factor of 100.

		
	 Class III Activities:
	  	 
	Class III activities include:	  	Abrasive blasting, welding, cutting and torch burning on steel structures.
		
	Potential Exposure:	  	 Greater than 2,500 ug/m3.

Minimum Respiratory Protection: Full face supplied - air respirator operated in pressure demand mode or - the positive pressure mode.

 DOSH 8 CCR 1532.1 requires that an initial exposure assessment be performed if workers will be performing any of the trigger
tasks found in 1532.1. It should be noted that the California Department of Health Services (OHS) has issued emergency work procedures for lead paint materials that in the absence of any other procedures are recommendations. 

  
 7 

 The following recommendations are general site specific work practice specifications. 

 

	•	 	You must use “containment” when you sand, scrape, or disturb any detectable level of lead in paint or surface coatings. 

  

	•	 	Containment is required for abatement and/or any activity that or disturb any detectable level of lead in paint or surface coatings. 

 

	•	 	You must be OHS-certified (workers, supervisors, monitors, and inspectors) if you are conducting abatement. 

  

	•	 	You must follow an abatement plan. 

  

	•	 	A OHS -certified supervisor, monitor, and/or project designer must design an abatement project. 

  

	•	 	A clearance inspection by dust wipe sampling is required for abatement. 

 LEAD WASTE DISPOSAL 

The visual determination indicated that all building components that tested positive were in intact to poor condition (minor cracking to flaking and peeling).
As such, these components need to be considered a lead hazard if flaking paint is not stabilized. All small debris (paint chips, rags, filters, and components smaller that 2”x2”) that may be generated during the paint stabilization process
(paint preparation) should be considered Class I, lead hazardous waste. The debris generated from paint stabilization of LBP building components should be segregated from all other dust and debris. Building components, which tested positive, should
be stabilized by a OHS-accredited Contractor. 
 Power washing may be conducted on the building. Run off water must be collected and analyzed by an
accredited laboratory to meet the criteria established by the Clean Water Act, Resource Conservation and Recovery Act (RCRA 1972). Lead levels must not exceed 5mg/L. 

  
 8 

 CODES AND REGULATIONS - LEAD-BASED PAINT 

Federal and state regulations, which govern lead-based, paint work or hauling and disposal of lead-based paint waste materials include but are not limited to
the following: 
 FEDERAL 
 Housing and Urban
Development (HUD) 1995 Guidelines For The Evaluation and Control of Lead-Based Paint in Housing 
 OSHA 

Lead In Construction 
 29
CFR 1926.62 
 NESHAP 
 Emissions
Standards 
 40 CFR 50.12 
 Lead-Based
Paint Poisoning Prevention Act (LBPPPA), 1970. 
 Title 10 - Residential LBP Hazard Reduction Act, 1992, (amendment for LBPPPA, 1970) 

Resource Conservation Recovery Act (RCRA) 
 STATE 

Cal/OSHA 
 Lead In Construction 

Title 8 CCR 1532.1 
 Department of Health
Services (DHS) 
 Emergency Work Practice Regulations 

Title 17 CCR, Division 1, Chp. 

  
 9 

 APPENDIX A 

XRF - DATA RESULTS TABLE 

 

 

  

					
	Bldg. 154 - Lead	  	Confidential	  	Page 1

 

 

  

					
	Bldg. 154 - Lead	  	Confidential	  	Page 2

 

 

  

					
	Bldg. 154 - Lead	  	Confidential	  	Page 3

 

 

  

					
	Bldg. 154 - Lead	  	Confidential	  	Page 4

 

 

  

					
	Bldg. 154 - Lead	  	Confidential	  	Page 5

 

 

  

					
	Bldg. 154 - Lead	  	Confidential	  	Page 6

 APPENDIX 8 

CERTIFICATION(S) 

 THIRD AMENDMENT TO NASA AMES RESEARCH 

CENTER ENHANCED USE LEASE 

This Third Amendment to NASA Ames Research Center Enhanced Use Lease of Historic Property (the “Amendment”) is made as of August 17,
2016, by and between THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, an Agency of the United States of America, acting by and through Ames Research Center (“Landlord”), and BLOOM ENERGY CORPORATION, a Delaware corporation
(“Tenant”), with reference to the following facts: 
 A. Landlord and Tenant entered into that certain NASA Ames Research Center
Enhanced Use Lease, dated as of December 5, 2011 (SAA2 – 402658), as amended (collectively, the “Original Lease”). The current Expiration Date under the Original Lease is December 31, 2016. Each capitalized term used in this
Amendment, but not defined herein, shall have the meaning ascribed to it in the Original Lease. 
 B. Tenant desires to continue to lease the
Premises, and has requested to extend the Term for an additional one (1) year, and to have the right to request a further extension of the Term for an additional one (1) year. Landlord is willing to amend the Original Lease on the terms
and conditions of this Amendment. 
 NOW, THEREFORE, the parties agree as follows: 

1. Amendments of the Original Lease. Effective as of January 1, 2017 (the “Effective Date”), the parties hereby agree
that the Original Lease is amended as follows. 
 (a) The Basic Lease Information attached to the Original Lease is hereby deleted and
replaced in its entirety with the Basic Lease Information attached to this Amendment as Exhibit I. Among other things, the amended Basic Lease Information sets forth a new Expiration Date of December 31, 2017, and reflects the amount of monthly
Gross Rent as of the Effective Date. 
 (b) The following language is hereby added as section 2.1(b) to the Original Lease as follows: 

“(b) Provided that (i) no Event of Default (as defined in section 10.1) has occurred and no event has occurred which,
with the passage of time, the giving of notice, or both, would constitute an Event of Default, and (ii) Landlord, in its sole and absolute discretion, consents in writing, then Tenant shall have the right to extend the Term for up to one
(1) additional period of one (1) year on and subject to the following terms and conditions. Tenant may exercise such right to extend the Term only by delivering written notice to Landlord of Tenant’s election to extend the Term at
least ninety (90) days before the then – current expiration of the Term. Upon Landlord’s receipt of any such notice, Landlord shall promptly consider Tenant’s request and deliver to Tenant written notice granting or withholding
Landlord’s consent in Landlord’s sole and absolute discretion; provided, however, if Landlord fails to deliver to Tenant any such 

  

			
	BLOOM EUL 3rd Amend Final 8.17.16	  	SAA2 - 402658

 
notice on or before the date that is forty – five (45) days before the then – current expiration of the Term, then Landlord shall be conclusively deemed to have withheld its
consent and the Term shall expire on the then – current Expiration Date. If the Term is duly extended in accordance with this section 2.l (b), Tenant shall continue to occupy the Premises on all of the other terms and conditions of this Lease.
In no event shall the Term extend beyond December 31, 2018.” 
 (c) Section 14.2 of the Original Lease is hereby deleted and
replaced in its entirety with the following language: 
 “14.2 Close Calls and Mishaps. 

(a) For purposes of this Lease, the following terms shall have the following meanings: (i) “Close Call” shall
mean an event in which there is no injury or only minor injury requiring first aid and/or no equipment or property damage, or minor equipment or property damage of less than $20,000, or not injury or only minor injury requiring first aid, but which
possesses a potential to cause a Mishap (as defined below); and (ii) “Mishap” shall mean an unplanned event that results in at least one of the following: (a) injury to non-Landlord personnel, caused by Landlord operations;
(b) damage to public or private property (including foreign property), caused by Landlord operations or Landlord-funded development or research projects; (c) occupational injury or occupational illness to Landlord personnel;
(d) Landlord mission failure before the scheduled completion of the planned primary mission; (e) destruction of, or damage to, Landlord property except for a malfunction or failure of component parts that are normally subject to fair wear
and tear and have a fixed useful life that is less than the fixed useful life of the complete system or unit of equipment, provided that the following are true: (1) there was adequate preventative maintenance; and (2) the malfunction or
failure was the only damage and the sole action is to replace or repair that component. If, in Tenant’s discretion, Tenant believes that a Close Call or Mishap may become highly visible outside of Tenant’s organization (such as by the
media or a governmental agency), then Tenant shall promptly notify Landlord by telephoning the NASA Ames Safety, Health and Medical Services Division at 650 – 604 – 5602. 

(b) In addition, Tenant shall notify both the Occupational Safety and Health Administration (“OSHA”) by telephoning
the area office nearest the site of the Mishap or OSHA’s toll-free number, 800 – 321 – 6742 and the NASA Ames Safety, Health and Medical Services Division at 650 – 604 – 5602 within the following timeframes: 

 

					
	 Incident Type
	  	 Timeframe Requirement

for Reporting Incidents
 Directly to
OSHA
	  	 Requirement for Reporting

Incidents to Landlord’s
 Safety,
Health, and Medical
 Services Division

	1 or more work-related fatalities	  	Within 8-hours	  	As Soon as Possible
	3-work-related in-patient hospitalizations	  	Within 24-hours	  	As Soon as Possible
	1 or 2 - work-related in-patient hospitalizations	  	Within 24-hours	  	As Soon as Possible
	Amputations	  	Within 24-hours	  	As Soon as Possible
	Employee’s loss of an eye	  	Within 24-hours	  	As Soon as Possible

  

			
	BLOOM EUL 3rd Amend Final 8.17.16	  	SAA2 - 402658

 2 

 (c) The Director of NASA Ames Research Center reserves the right to investigate
any Mishap in accordance with Landlord’s policies and procedures.” 
 (d) The site plan outlining the building Premises attached to
the Original Lease as a portion of Exhibit A is hereby deleted and replaced in its entirety with the site plan outlining the building Premises attached to this Amendment as Exhibit 2. Exhibit A-1 remains unchanged. 

(e) The List of Environmental Reports attached to the Original Lease as Exhibit D is hereby deleted and replaced in its entirety with
the List of Environmental Reports attached to this Amendment as Exhibit 3. 
 2. No Other Amendment; Conflicts. Except as set forth in
this Amendment, the provisions of the Original Lease remain in full force. If the provisions of this Amendment conflict with the provision§·of the Original Lease, then the provisions of this Amendment shall prevail. 

IN WITNESS WHEREOF, Landlord and Tenant have executed this Amendment as of the date first written above. 

 

									
	Tenant:	 		 	Landlord:
			
	BLOOM ENERGY CORPORATION, a	 		 	NATIONAL AERONAUTICS AND SPACE
	Delaware corporation	 		 	ADMINISTRATION, an Agency of the United States
					
	By	 	 /s/ Randy Furr
	 		 	By	 	 /s/ Eugene L. Tu

		 		 		 		 	Dr. Eugene L. Tu
		 	Chief Financial Officer	 		 		 	Director, Ames Research Center

  

			
	BLOOM EUL 3rd Amend Final 8.17.16	  	SAA2 - 402658

 3 

 EXHIBIT 1 TO THIRD AMENDMENT 

NASA AMES RESEARCH CENTER 

ENHANCED USE LEASE 
 Amended
Basic Lease Information 
 Date: August 17, 2016. 
 Landlord:
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, an Agency of the United States, Ames Research Center located at Moffett Field, California. 
 Tenant: BLOOM
ENERGY CORPORATION, a Delaware corporation. 
 Premises (section 1.1): (a) The parcel of real property outlined in Ex hi b i t A, containing
approximately 73,939 square feet (more or less) of land area, including Parcel B543 (containing approximately 29,760 square feet, including square footage under Building 543); Building 543(containing approximately 9,166 square feet (more or less) of
lab space and 3,375 square feet of a new building constructed by Tenant (the “Additional Building”); and 44, 179 square feet of additional land (together, the “Building 543 Premises”); and (b) all of the space in Building
154 (“Building 154”) outlined in Exhibit A-1 containing approximately 14,359 square feet (more or less) of building area (the “Building 154 Premises”). The Building 543 Premises and the Building 154 Premises are located at
NASA Ames Research Center, Moffett Field, California. A site plan showing the locations of the Building 543 Premises and the Building 154 Premises is attached hereto as Exhbit A. Building 543 and Building 154 are individually referred to herein as a
“Building” and are collectively referred to herein as the “Buildings.” 
 Property (section 1.1): The land, the buildings and other
improvements known as NASA Ames Research Center, Moffett Field, California 94035-1000. 
 Term (section 2.1): Six (6) years, subject to the right to
extend the Term in accordance with section 2.1(b). 
 Commencement Date (section 2.1): December 16, 2011. 

Expiration Date (section 2.1): December 31, 2017. 
 Monthly
Base Rent (dollars per month) (section 3.1): $43,772.19, including $13,199.04 (based on $1.44 per square foot per month for the portion of Building 543 containing 9, 166 square feet of lab space); $1,215.00 (based on $0.36 per square foot per month
for the portion of Building 543 containing the Additional Building); $8,394.01 (based on $0.19 per square foot per month for 44, 179 square feet of additional land surrounding Building 543); and $20,964.14 (based on $1.46 per square foot per month
for office space in Building 154). The fair market value of Parcel B543 containing 29,760 square foot is included in the Monthly Base Rent for Building 543. 

Security Deposit (section 3.3): $40,500.00. 

  

			
	BLOOM EUL 3rd Amend Final 8.17.16	  	SAA2 - 402658

			
	Rent Payment Address (section 3.7):	  	NASA Shared Service Center (NSSC)-
		  	FMD Accounts Receivable
		  	Attn: For the Accounts of Ames Research Center
		  	(Agreement #SAA2-402658)
		  	Bldg. 1111, C Road
		  	Stennis Space Center, MS 39529

 Permitted Use of the Premises (section 4.1): Bloom Energy will use and occupy the Building 543 Premises solely for research
and development, and testing, including as its research laboratory and to test its products. Bloom Energy will use and occupy the Building 154 Premises solely for office purposes; provided, however, Bloom Energy may use rooms 124, 125, 126, 128, 129
and 130 for minor assembly of wiring harnesses and piping. 
  

			
	Landlord’s Address (section 14.1):	  	NASA Ames Research Center
		  	 Ms. Mejghan K. Haider, Mail Stop 204 – 2

Bldg. 204, Rm 215

		  	P.O. Box 1
		  	Moffett Field, CA 94035-0001
		
	Tenant’s Address (section 14.1):	  	Bloom Energy Corporation
		  	1252 Orleans Drive
		  	 Sunnyvale, CA 94089
 Attn: Mr. Randy
Furr

 Exhibit A – Site Plan; Plan Outlining the Building 543 Premises 

Exhibit A-1 – Plans Outlining the Building 154 Premises 

Exhibit B – Description of the TI Work 
 Exhibit C –
Support Agreement 
 Exhibit D – List of Environmental Reports 

The foregoing Basic Lease Information is incorporated in and made a part of the Lease to which it is attached. Ifthere is any conflict between
the Basic Lease Information and the Lease, the Basic Lease Information shall control. 
  

									
	Tenant:	 		  	Landlord:
			
	BLOOM ENERGY CORPORATION, a	 		  	 NATIONAL AERONAUTICS AND SPACE

	 Delaware corporation
	 		  	 ADMINISTRATION, an Agency of the United States

					
	By	 	 /s/ Randy Furr
	 		  	By	  	 /s/ Eugene L. Tu

		 		 		  		  	 Dr. Eugene L. Tu

		 	 Chief Financial Officer
	 		  		  	 Director, Ames Research Center

  

			
	BLOOM EUL 3rd Amend Final 8.17.16	  	SAA2 - 402658

 II 

 EXHIBIT 2 TO THIRD AMENDMENT 

Revised Site Plan; Plan Outlining the Building 543 Premises 

(Supersedes Exhibit A to Original Lease) 
  

 
  

  

			
	BLOOM EUL 3rd Amend Final 8.17.16	  	SAA2 - 402658

 iii 

 EXHIBIT 3 TO THIRD AMENDMENT 

Revised Li st of Environmental Reports 

(Supersedes Exhibit D to Original Lease) 

Revised Human Health Risk Assessment for NASA Research Park 

Environmental Issues Management Plan 
 Lead Impacted Soil Summary
Report and Sampling and Removal Action Work Plan 
 Environmental Baseline Survey – Parcel 5 

Building 543 Premises 
 Closure Plan 5 

1994 Asbestos Survey of Bldg. 543 
 Bldg. 543 Asbestos /
Lead and Mold Investigation 2001 
 Bldg. 543 Asbestos Sampling 2009 

Build i ng l54 Premises 
 Bldg 154 Asbestos / Lead
Investigation 2002 
 1994 Asbestos Survey of Bldg. 154 
 Bldgs
153, 154, 155, 156 Asbestos / Lead Visible Mold Investigation 2002 
 Bldg. 154 Asbestos Sampling 2010 

  

			
	BLOOM EUL 3rd Amend Final 8.17.16	  	SAA2 - 402658

 iv 

 SUPPORT AGREEMENT 

 

											
	 1. AGREEMENT NUMBER
 (Provided DV
Supplier)
 SAA2-402658
	  	2. SUPERSEDED AGREEI’IENT NO.	  	 3. EFFECTIVE DATE
  

October 1, 2016
	  	 
 
 
	4. EXPIRATION DATE
 (Mav be ‘Indefinite”)

September 30, 2017

		
	!l. SUP PLYING ACTIVITY	  	6. RECEIVING ACTIVITY
		
	 a. NAME AND ADDRESS
  

National Aeronautics and Space Administration
 Ames Research
Center
 Moffett Field, CA 94035-1000
  

NRP Business Development Specialist: Cynthia Carbon-Norman
	  	 a. JIIAME AND ADDRESS
  

Bloom Energy Corporation
 1252 Orleans Drive

Sunnyvale, CA 94089
 Attn: Mr. Randy Furr

		
	 b. MAJOR COMMAND
  

NASA HQ, Science Mission Directorate, Washington D.C.
	  	b MAJOR COMMAND
	
	7. SUPPORT PROVIDED BY SUPPLIER
			
	 a SUP PORT (Specify wna. wnen, Where, and how much)

 
 Modified Net Rent

 
	  	b. BASIS FOR REIMBURSEMENT	  	 	c ESTIMATED REIMBURSEMENT
	From 10/01116 - 12/31116:	  		  				  	
	Bldg. 543 Premises (9, 166 sf @ $1 08 sf/mo)	  	Market comps	  	$	29,697.84	 	  	
	Bldg, 543 Additional Lan d Area (44,179 sf @ $0 19 sf/mo)	  	Market comps	  	$	25,182.03	 	  	
	Bldg. 154 (14,359 sf @ $1.10 sf/mo)	  	Market comps	  	$	47,384.70	 	  	
	B543 Addition	  		  	$	         - 0 -	 	  	
	Sub Total	  		  		  	$	102,264.57	 	  	
				
	From 01/01117 - 09/31117 (3% CPI Increase begins)	  		  				  	
	Bldg. 543 Premises (9, 166 sf @ $1 11 sf/mo)	  		  	$	91,568.34	 	  	
	Bldg. 543 Additional Lan d Area (44, 179 sf @ $0 20 sf/mo)	  		  	$	79,522.20	 	  	
	Bldg. 154 (14,359 sf @ $L13 sf/mo)	  		  	$	146,031.03	 	  	
	B543 Addition	  		  		  	 	             - 0 -	 	  	
		  		  		  	  
	  
	 	  	
	Sub Total	  		  	$	317, 121 57	 	  	
				
	Institutional Services Pool ($0.39 sf/mo)	  		  	$	42,896.88	 	  	
	Bldg 543 Premises (9, 166 sf)	  		  	$	         - 0 -	 	  	
	Bldg. 543 Additional Land Area (44, 179 sf)	  		  	$	67,200 12	 	  	
	Bldg 154 (14,359 sf)	  		  	$	 15,79500	 	  	
		  		  		  	  
	  
	 	  	
	Bldg. 543 Addition (3,37 5 sf)	  		  	$	125,892.00	 	  	
				
	Demand Services (Due in Advance Quarterly):	  		  				  	
	    - Utilities Metered, Bldgs 543 & 154 (based on FY16 actual)	  	Actual Cost	  	$	315,000.00	 	  	
				
	    - Facilities	  	Estimate	  	$	    2,000 00	 	  	
				
	Grand Total	  		  	$	862,278.14	 	  	
				
	Security Deposit	  	Paid in FYJ 2, carryover into FY17	  	$	  40,500 00	 	  	
				
	        ADDITIONAL SUPPORT REQUIREMENTS ATTACHED: D Yes	  	D No	  				  	
		
	8. SUPPLYING COMPONENT	  	9. RECEIVING COMPONENT
				
	 a. COMPTROLLER SIGNATURE
 n/a
	  	 b DATE SIGNED
 n/a
	  	 a. COMPTROLLER SIGNATURE
 n/a
	  
  
	  	 b. DATE SIGNED
 n/a

		
	c. APPROVI NG AUTHORITY	  	c. APPROVINGAUTHORITY
		
	 (1) Typed Name
 Paul Agnew
	  	 (11 Typed Name
 Randy Furr, Ch ief
Financial Officer

					
	 (21 Orqanization
 Chief Financial Officer
	  	 (3) Telephone Number
 (650) 604-1301
	  	 (2) Orqanizalion
 Bloom Energy
Corporation
	  				  	(3) Telephone Number
				
	(4) Siqnature	  	(5) Date Siqned	  	(4) Signatures: /s/ Randy Furr	 	  	10/19/2014
		
	10. TERMINATI ON (Complete only when agreement is terminated prior to scheduled expiration date.) J/	 	  	r
				
	a APPROVING AU THORITY SIGNATURE	  	b. DATE SIGNED	  	a. APPROVING AU THORITY SIGNATURE	 	  	b DATE SIGNED
			
	DD FORM 1144, NOV2001	  	PREVIOUS EDITIONS MAY BE USED	 	  	Page 1 of 3

  

 September 12, 2017 

Mr. Randy Furr 
 Chief Financial Officer 

Bloom Energy Corporation 
 1252 Orleans Drive 

Sunnyvale, CA 94089 
 Dear Mr. Furr: 

In response to your request to extend the term of the 3rd Amendment to the Enhanced Use Lease of Historic Property, SAA2-402658, dated August 17, 2016;
this letter serves as NASA Ames Research Center’s approval to extend the term for one year (currently expiring December 31, 2017). 

Notwithstanding your failure to request the extension in accordance with Section 2.1 (b), we hereby approve the request and agree to the extension on all
of the terms and conditions of the Lease. 
 This letter confirms that you continue to desire to extend the term and agree to perform your obligations under
the Lease through December 31, 2018. 
 We look forward to a continual working relationship with Bloom Energy. 

 

	
	 Sincerely,
  

	
	/s/ Cynthia Carbon-Norman
	Cynthia Carbon-Norman
	NRP Account Manager

 CC: 
 ARC/DT/204-2/M. Haider 
 ARC/DL/202A-4/T. BerndtEX-10.29

 Exhibit 10.29 

NET LEASE AGREEMENT 
 by
and between 
 BLOOM ENERGY CORPORATION, 

a Delaware limited liability company 

(“Tenant”) 

and 
 237 NORTH FIRST
STREET HOLDINGS, LLC, 
 a Delaware limited liability company 

(“Landlord”) 

 NET LEASE AGREEMENT 

For and in consideration of the rentals, covenants, and conditions hereinafter set forth, Landlord hereby leases to Tenant, and Tenant hereby rents from
Landlord, the following described Premises for the term, at the rental and subject to and upon all of the terms, covenants and agreements set forth in this Net Lease Agreement (“Lease”): 

1. Summary of Lease Provisions. The following terms shall have the following meanings set forth below: 

 

	 	1.1	Tenant: Bloom Energy Corporation, a Delaware corporation (“Tenant”). 

  

	 	1.2	Landlord: 237 North First Street Holdings, LLC, a Delaware limited liability company (“Landlord”). 

  

	 	1.3	Date of Lease, for reference purposes only: April 4, 2018. 

  

	 	1.4	Premises: That certain space, consisting of (i) approximately five thousand three hundred forty-five (5,345) rentable square feet on the first floor of that certain Building referred to in Paragraph 1.5
below, and shown cross-hatched or otherwise identified on the floor plan attached hereto as Exhibit A-1, (ii) approximately thirty-two thousand seven hundred
ninety-nine (32,799) rentable square feet on the fourth floor of the Building referred to in Paragraph 1.5 below, and shown cross-hatched or otherwise identified on the floor plan attached hereto as Exhibit
A-2, (iii) approximately thirty-two thousand seven hundred ninety-nine (32,799) rentable square feet on the fifth floor of the Building referred to in Paragraph 1.5
below, and shown cross-hatched or otherwise identified on the floor plan attached hereto as Exhibit A-3 and (iv) approximately thirty-two thousand seven
hundred ninety-nine (32,799) rentable square feet on the sixth floor of the Building referred to in Paragraph 1.5 below, and shown cross-hatched or otherwise identified on the floor plan attached hereto as Exhibit
A-4. For purposes of this Lease, the total rentable square footage of the Premises is one hundred three thousand seven hundred forty-two (103,742) rentable square
feet. (Paragraph 2.1) 

  

	 	1.5	Building: That certain building constructed on Parcel C (as described on Exhibit F-1) and shown cross-hatched or otherwise identified on the site plan attached
hereto as Exhibit B located at 4353 North First Street in the City of San Jose, County of Santa Clara, State of California. For purposes of this Lease, the total rentable square footage of the Building is hereby stipulated and agreed to be
one hundred eighty-four thousand three hundred fifty-two (184,352), less 50% of the then current rentable square footage of the Building occupied by the fitness center described in Paragraph 11.3 (as of the
date hereof, such portion of the fitness center being 3,309 rentable square feet), for a total of one hundred eighty-one thousand forty-three (181,043) rentable square feet. (Paragraph 2.1) 

  
 -1- 

	 	1.6	Term: One hundred twenty (120) months (plus the partial month following the Commencement Date if such date is not the first day of a month), unless sooner terminated or extended pursuant to the terms of this
Lease. If the Commencement Date is other than the first day of a calendar month, the first month shall include the remainder of the calendar month in which the Commencement Date occurs plus the first full calendar month thereafter, provided,
however, that the inclusion of any partial month in the first full calendar month shall not entitle Tenant to any additional free Base Rent; it being understood and agreed that Base Rent for the first six (6) full calendar months of the initial
Term of this Lease shall be conditionally abated as provided in Paragraph 1.10 below. (Paragraph 3) 

  

	 	1.7	Delivery Date: One (1) business days after the date the last of Landlord or Tenant executes and delivers this Lease. 

  

	 	1.8	Commencement Date: The earlier of (i) January 1, 2019, (ii) the date a certificate of occupancy (or its equivalent) is issued with respect to the Premises or (iii) the date Tenant opens for
business in the Premises (if that occurs). (Paragraph 3) 

  

	 	1.9	Ending Date: The date one hundred twenty (120) full calendar months following the Commencement Date, unless sooner terminated or extended pursuant to the terms of this Lease. (Paragraph 3)

  

	 	1.10	Base Rent: During the initial Lease Term, Tenant shall pay monthly Base Rent for the Premises to Landlord in accordance with the schedule set forth below: 

 

									
	 Lease Months

During Term
	  	Monthly Base
Rental Rates Per
Rentable Square
Foot (NNN)
(Rounded to
nearest one
hundredth)	 	  	Monthly Base Rent (NNN)	 
	 01-06
	  	$	 0.00/RSF	* 	  	$	0.00	* 
	 07-12
	  	$	2.75/RSF	 	  	$	285,290.50	 
	 13-24
	  	$	2.83/RSF	 	  	$	293,849.22	 
	 25-36
	  	$	2.92/RSF	 	  	$	302,664.70	 
	 37-48
	  	$	3.00/RSF	 	  	$	311,744.64	 
	 49-60
	  	$	3.10/RSF	 	  	$	321,096.98	 
	 61-72
	  	$	3.19/RSF	 	  	$	330,729.89	 
	 73-84
	  	$	3.28/RSF	 	  	$	340,651.79	 
	 85-96
	  	$	3.38/RSF	 	  	$	350,871.34	 
	 97-108
	  	$	3.49/RSF	 	  	$	361,397.48	 
	 109-120
	  	$	3.59/RSF	 	  	$	372,239.40	 

  
 -2- 

	*	The Base Rent payable during each of the first six (6) full calendar months of the initial Lease Term (the “Abatement Period”) is actually Two Hundred Eighty-five Thousand Two Hundred Ninety and 50/100
Dollars ($285,290.50) per month; however, Landlord agrees that such monthly Base Rent during the Abatement Period (the “Abated Rent”) shall be conditionally abated so long as no Default by Tenant (as defined in Paragraph 14 below) occurs
during the initial Term of this Lease. In the event a Default by Tenant occurs during initial Term of this Lease and Landlord terminates this Lease or Tenant’s possession as a result thereof pursuant to Paragraph 14.1 below, then the
unamortized portion of the Abated Rent (which Abated Rent shall be amortized over a period of one hundred fourteen (114) months) shall become immediately due and payable following written demand of Landlord and Landlord shall be entitled to
include such unamortized portion of the Abated Rent in the amount of rentals that it is otherwise entitled to recover from Tenant under Paragraph 14.1(d) below and under California Civil Code Section 1951.2. For sake of clarification, if the
Commencement Date is other than the first (1st) day of a calendar month, the Abatement Period will begin on the Commencement Date and will end on the day immediately preceding the six months anniversary of the Commencement Date (e.g., if the
Commencement Date is December 10, 2018, then the Abatement Period will end on June 9, 2019 and Tenant will commence paying Base Rent for the Premises on June 10, 2019). Commencing as of the Commencement Date of this Lease and
thereafter during the Term of this Lease, as such Term may be extended, Tenant shall be obligated to pay Tenant’s percentage share of Operating Expenses pursuant to the terms of the Lease below. (Paragraph 4) 

 

	    	Within five (5) business days following the execution of this Lease by Landlord and Tenant, Tenant shall pay to Landlord the sum of $285,290.50, which shall be credited against the Base Rent payable during the
seventh (7th) full calendar month of the initial Term. 

  

	 	1.11	Use of Premises: General office, research and development, administration and any other ancillary use to the extent permitted by local zoning ordinances applicable to the Premises and all applicable Laws;
provided, however, no portion of the Premises shall be use or operated as a flexible workplace center (or as an executive suite center), with or without individual offices or ancillary services (Paragraph 6.1) 

 

	 	1.12	 Tenant’s percentage share: Fifty-seven and thirty one hundredths percent (57.30%). For purposes of
calculating Tenant’s percentage share of Operating Expenses for the Building, Tenant’s percentage share is the rentable square footage of the Premises (stipulated in Paragraph 1.4 above) over the rentable square footage of the Building
(stipulated in Paragraph 1.5 above). Approximately three thousand three hundred nine (3,309) square feet of the fitness center situated in the Building (and considered part of the Common Area) is allocated by the Landlord to the Parcel B Building
referred to in Paragraph 2.1(d) below and having an address of 4453 North First Street, San Jose, California. In addition, Operating Expenses for the Building will include (i) the “Building’s percentage share” of Exterior Common
Area Operating Expenses 

  
 -3- 

	 	
which is forty-nine and twelve one hundredths percent (49.12%), being the rentable square footage of the Building (as stipulated in Paragraph 1.5 above) over the sum of said rentable square
footage of the Building plus the rentable square footage of the other building(s) on the Land, which as of the date hereof shall include the anticipated square footage of the Parcel B Building, which is stipulated to be one hundred eighty-seven five
hundred fifty-four (187,554) rentable square feet, and (ii) an equitable percentage of the Taxes allocable or attributable to Parcel A (as shown on the Parcel Map referred to below) and the surface parking and other improvements now or
hereafter situated on Parcel A (as determined by the County of Santa Clara Tax Assessor) and which shall be included in the tax bill for the Taxes imposed upon or relating to the Building or Parcel C as shown on the Parcel Map referred to below.
(Paragraph 12) 

  

	 	1.13	Cash Security Deposit: Three Hundred Seventy-two Thousand Two Hundred Thirty-nine and 40/100 Dollars ($372,239.40) 

 

	 	1.14	Addresses for Notices: 

  

			
	 To Landlord:
	  	 237 North First Street Holdings, LLC

		  	 c/o South Bay Development Company

475 Alberto Way, Suite 150

		  	 Los Gatos, CA 95032

		  	 Attn: Mark Regoli

		
	 With a courtesy copy to:
	  	 Pacific Coast Capital Partners

		  	 555 California Street, Suite 3450

		  	 San Francisco, CA 94104

		  	 Attn: Aaron Giovara

		
	 To Tenant:
	  	 Prior to the Commencement Date:

		
		  	 Bloom Energy Corporation

1299 Orleans Drive

		  	 Sunnyvale, CA 94089

		  	 Attn: General Counsel

		
		  	 After the Commencement Date:

		
		  	 At the Premises

  

	 	1.15	Right to Use No More Than: Three hundred forty-two twenty-four (342) unreserved parking spaces within the Common Area pursuant to Paragraph 11.2 below; however,
Landlord shall mark five (5) of such parking spaces in front of the Building for “Bloom Visitors”. (Paragraph 11.2) 

  

	 	1.16	Summary Provisions in General. Parenthetical references in this Paragraph 1 to other paragraphs in this Lease are for convenience of reference, and designate some of the other Lease paragraphs where
applicable provisions are set forth. All of the terms and conditions of each such referenced paragraph shall be construed to be incorporated within and made a part of each of the above referring Summary of Lease Provisions. In the event of any
conflict between any Summary of Lease Provision as set forth above and the balance of the Lease, the latter shall control. 

  
 -4- 

 2. Premises; Building; Exterior Common Area; Project. 

2.1 Premises. Landlord hereby leases to Tenant and Tenant hereby leases from Landlord upon the terms and conditions herein set forth,
those certain premises (“Premises”) referred to in Paragraph 1.4 above and shown cross-hatched or otherwise identified on the floor plans attached hereto as
Exhibit A-1, Exhibit A-2 and Exhibit A-3. In addition, Tenant shall have such rights in
and to the Common Area (defined in Paragraph 11.1 below) as are more fully described in Paragraph 11.1 below. 
 (a)
Definitions. The building in which the Premises are located is referred to herein as the “Building.” The “Land” shall mean and refer to all of the real property described on Exhibit F attached hereto and commonly
known, as of July 1, 2018, as APNs: 015-39-057 (consisting of approximately 1.159 acres),
015-39-058 (consisting of approximately 1.159 acres) and a parcel identified as “Common Area” on the Assessor’s Parcel Map attached hereto as Exhibit F-1. The Land consists of the real property comprising Parcels A, B and C as shown on that certain Parcel Map being a Subdivision of Parcel 1 as Shown on that certain Parcel Map filed October 29, 2015 in
Book 888 of Maps at Pages 1-11, Santa Clara County Records, which Parcel Map has been recorded in the Santa Clara County Records and a copy of which is attached hereto as Exhibit F-2 (the “Parcel Map”). The term “Exterior Common Area” as used herein shall mean the Common Area located on Parcel A as shown on such Parcel Map and any access drives and Common Area parking
areas (if any) to the extent located elsewhere on Parcel A or elsewhere on the Land. The Land, the Common Area (including, without limitation, the Exterior Common Area referred to above and the Restricted Common Area referred to in Paragraph 11.1
below), the Building and any other building(s) or improvement(s) now or hereafter located on the Land are referred to herein collectively as the “Project.” Landlord and Tenant agree that all measurements of area contained in this Lease,
including, without limitation, the size of the Premises, Building and Project, are an approximation which Landlord and Tenant agree are reasonable. Such measurements of area contained in this Lease also are conclusively agreed to be correct and
binding upon the parties, and any subsequent determination that the area is more or less than shown in this Lease shall not result in a change in any way in the computations of Rentals; provided, however, in the event that Landlord constructs the
retail building described in Paragraph 2.1(e) below or some other building on Parcel A, Taxes on such building and the land on which such building sits will not be included in Parcel A Taxes and the Building’s percentage share of Parcel A
Operating Expenses and Parcel A Taxes shall be reduced to account for any increase in the rentable square footage of the building(s) on the Land with the addition of the rentable square footage of such retail or other building, as such rentable
square footage is reasonably determined by Landlord. 
 (b) Use of Exterior Common Area. Landlord reserves the right to grant to
tenants of the Project, and to the agents, employees, servants, invitees, contractors, guests, customers and representatives of such tenants or to any other user authorized by Landlord, the nonexclusive right to use the Exterior Common Area
(exclusive of any portion of the Land designated for the exclusive use of any tenant, including, without limitation, the Restricted Common Area referred to in Paragraph 11.1 and identified on Exhibit G attached hereto) for pedestrian and
vehicular ingress and egress and, subject to the provisions of Paragraph 11.1 and Paragraph 11.2 below, vehicular parking. 

  
 -5- 

 (c) Construction of Parcel B Building. Landlord hereby discloses to Tenant that Landlord
has commenced construction of an approximately 187,351 rentable square foot office building to the northwest of the Building in which the Premises is located (the “Parcel B Building”). The location of such Parcel B Building is shown on the
site plan attached hereto as Exhibit B. During the construction of the Parcel B Building, Tenant shall abide by, and cause its agents, employees, contractors, invitees, licensees, guests and customers to abide by, all safety and construction
rules and regulations of Landlord or its affiliate and its general contractor. Tenant’s monthly Base Rent and Additional Rent shall not be abated as a result of such construction and, during the period of construction of the Parcel B Building,
Tenant shall continue to timely perform all of its obligations under this Lease then accruing. The preceding notwithstanding, Landlord shall exercise commercially reasonable efforts to minimize, to the extent practicable under the circumstances, any
interference that the construction of the Parcel B Building may have on Tenant’s business operations in the Premises. Such commercially reasonable efforts, as such term is used in the immediately preceding sentence, shall not require Landlord
or its affiliate or contractors to undertake construction of any of the Parcel B Building on weekends or evenings or require Landlord to install any soundproofing in the Premises or Building or elsewhere in the Project. Tenant hereby waives any
right to terminate this Lease due to any such construction activities undertaken with respect to the construction of the Parcel B Building unless Tenant is deprived of all beneficial use of the Premises for twelve (12) consecutive months or
more. 
 (d) Construction of Retail Building. Landlord may obtain entitlements and permits for, and thereafter construct, an
approximately 6,500 square foot retail building in the area identified on Exhibit E attached hereto (and located in a part of the southern portion of the Exterior Common Area). During the construction of such retail building, Tenant shall
abide by, and cause its agents, employees, contractors, invitees, licensees, guests and customers to abide by, all safety and construction rules and regulations of Landlord or its affiliate and its general contractor. Tenant’s monthly Base Rent
and Additional Rent shall not be abated as a result of such construction and, during the period of construction of such retail building, Tenant shall continue to timely perform all of its obligations under this Lease then accruing. The preceding
notwithstanding, Landlord shall exercise commercially reasonable efforts to minimize, to the extent practicable under the circumstances, any interference that the construction of such retail building may have on Tenant’s business operations in
the Premises. Such commercially reasonable efforts, as such term is used in the immediately preceding sentence, shall not require Landlord or its affiliate or contractors to undertake construction of any of such retail building on weekends or
evenings or require Landlord to install any soundproofing in the Premises or Building or elsewhere in the Project. Tenant hereby waives any right to terminate this Lease due to any such construction activities undertaken with respect to the
construction of the retail building referred to herein unless Tenant is deprived of all beneficial use of the Premises for twelve (12) consecutive months or more. 

2.2 Improvements. The improvements to be constructed by Landlord for Tenant’s use in the Premises are set forth in detail in the
Improvement Agreement attached hereto as Exhibit C (the “Improvement Agreement”). The Improvement Agreement also addresses the terms and conditions upon which Tenant shall have the right to construct Initial
Improvements (as defined in the Improvement Agreement) in the Premises. The Improvement Agreement is incorporated herein by reference and made a part hereof. Landlord and Tenant each agree that it is bound by the terms and conditions of the
Improvement Agreement and that it shall timely perform its respective obligations thereunder. Except as otherwise expressly provided in this Lease (including, without limitation, the Improvement Agreement), Landlord shall not be obligated to
construct or install any leasehold improvements in, on or around the Premises, Building or Project or obligated to provide any tenant improvement allowance or other allowance to Tenant. 

  
 -6- 

 2.3 Acceptance of Premises. Subject to the provisions set forth in the next grammatical
paragraph of this Paragraph 2.3, by taking possession of the Premises, Tenant shall be deemed to have accepted the Premises as being in good and sanitary order, condition and repair and to have accepted the Premises in their condition existing as of
the date Tenant takes possession of the Premises, subject to all applicable laws, covenants, conditions, restrictions, easements and other matters of public record and the Rules and Regulations described in Paragraph 47 below; provided, however, the
foregoing shall not relieve Landlord from its express obligations under the terms of this Lease. Tenant acknowledges that, except as may be expressly set forth in this Lease, neither Landlord nor any of Landlord’s agents, employees, affiliates,
or property manager have made any representation or warranty (express or implied) as to the suitability of the Premises for the conduct of Tenant’s business, the condition of the Building or Premises, the compliance of the Premises with any
codes, laws, ordinances, rules or regulations, or the use or occupancy which may be made thereof and Tenant has independently investigated and is satisfied that the Premises are suitable for Tenant’s intended use. Tenant shall be responsible
for confirming that its use of the Premises is permitted under local zoning ordinances applicable to the Premises (and Tenant acknowledges that Landlord makes no representation or warranty with respect to the same). 

Notwithstanding anything to the contrary contained in this Lease, Landlord agrees to deliver possession of the Premises to Tenant concurrently
with the execution of this Lease with the (i) Base Building mechanical, electrical, fire-life safety, plumbing, sprinkler and HVAC systems installed or furnished by Landlord serving the Premises (collectively, the “Building Systems”),
and (ii) the exterior walls, foundation, floor slabs, roof structure, columns, beams, shafts and stairwells, (collectively, the “Building Structure”) in good working order and repair. Landlord also agrees to deliver possession of the
Premises to Tenant concurrently with the execution of this Lease with the exterior windows, ceilings, roof membrane, elevators, Base Building restrooms and all Common Areas of the Building in good working order and repair. In addition, Landlord
hereby warrants the Building Systems serving the Premises and the roof of the Building against defects in workmanship and materials for a period of one (1) year following the Commencement Date. Tenant shall give written notice to Landlord if
any defect in the Building Systems serving the Premises and/or the roof becomes reasonably apparent, provided, however, such notice of any defects in the Building Systems serving the Premises and/or the roof must be delivered to Landlord within one
(1) year following the Commencement Date, and, provided such notice is timely given to Landlord by Tenant within such one (1) year period, Landlord shall, as Tenant’s sole and exclusive remedy for such defect(s), repair or replace, if
necessary (as reasonably determined by Landlord), such defect(s) in the Building Systems and/or roof identified in Tenant’s notice as soon as practicable at Landlord’s sole cost and expense (and without pass through to Tenant as an
Operating Expense or otherwise). For avoidance of doubt, the parties hereto agree that routine, preventative maintenance of any of the Building Systems serving the Premises shall not be covered by Landlord’s one (1)-year warranty above, but
replacement of any compressors, coils and/or fan motors comprising part of the heating, ventilation and air conditioning system serving the Premises, if necessary, shall be covered by Landlord’s one (1)-year warranty above. Anything herein to
the contrary notwithstanding, the parties hereto agree that Landlord’s obligation to repair any defects in the Building Systems serving the Premises or the roof of the Building pursuant to the terms of this paragraph above shall not be
applicable to any defects caused by the acts, omissions, negligence or willful misconduct or misuse of the Premises or Building, or applicable portion thereof, by Tenant or any of Tenant’s agents, employees, officers, directors, partners,
members, managers, affiliates, contractors, subcontractors, guests, invitees, licensees, sublessees or other representatives. 

  
 -7- 

 On March 29, 2018, Landlord, at Landlord’s sole expense, caused samples of indoor air
in the Building to be taken for the purpose of determining the presence and concentration of chlorinated volatile organic compounds (CVOCs) trichloroethylene (TCE), tetrachloroethene (PCE), and vinyl chloride (VC). Sampling and testing was conducted
using methods and protocols accepted by the California Department of Toxic Substances Control (DTSC) or California Occupational Safety and Health Agency (CalOSHA) for commercial or industrial exposures. Landlord has submitted the samples under chain
of custody protocols to a State of California-certified laboratory for analysis. Promptly upon receipt from the laboratory, Landlord shall provide to Tenant copies of the certificates of analysis for all samples taken in accordance with this
paragraph. With respect to such samples referred to above, if the detected level of any CVOC referred to above is detected above the DTSC’s health-based screening levels for commercial land use, Landlord shall take appropriate monitoring and
mitigation measures. Notwithstanding the foregoing, if the sampling for CVOC’s caused to be performed by Landlord as provided above show that no level of any CVOC is above the DTSC’s applicable health-based screening levels, Landlord shall
not be required to perform any additional testing for CVOCs during the Term. 
 Landlord represents for the benefit of Tenant that the Base
Building Condition set forth in Schedule C-1 to the Improvement Agreement is in compliance with all applicable Laws (as defined in Paragraph 6.1 below) as of the Delivery Date. Tenant shall give written notice
to Landlord within one (1) year following the Commencement Date if Tenant determines that any part of the Base Building Condition set forth in Schedule C-1 to the Improvement Agreement was not in
compliance with applicable Laws as of the Delivery Date. If such non-compliance notice is timely given to Landlord by Tenant within such one (1) year period, Landlord shall, as Tenant’s sole and
exclusive remedy for such non-compliance, repair or replace, if necessary (as reasonably determined by Landlord), such non-compliance items in the Base Building
Condition identified in Tenant’s notice as soon as practicable at Landlord’s sole cost and expense (and without pass through to Tenant as an Operating Expense or otherwise). Anything herein to the contrary notwithstanding, the parties
hereto agree that Landlord’s obligation to remedy or correct any non-compliance items with respect to the Base Building Condition pursuant to the terms of this paragraph above shall not be applicable to
any defects or non-compliance with applicable Laws caused by the acts, omissions, negligence or willful misconduct or misuse of the Premises or Building, or applicable portion thereof, by Tenant or any of
Tenant’s agents, employees, officers, directors, partners, members, managers, affiliates, contractors, subcontractors, guests, invitees, licensees, sublessees or other representatives. 

Nothing set forth in the two immediately preceding paragraphs shall excuse Landlord of any of its maintenance, repair or replacements
obligations under this Lease. 
 3. Delivery; Term. 

3.1 Delivery. Landlord shall deliver the Premises to Tenant on the date specified in Paragraph 1.7 above. If Landlord fails to deliver
the Premises to Tenant on the date specified in Paragraph 1.7 above and such failure continues for a period of three (3) business days following the date specified in Paragraph 1.7, then Tenant shall be entitled to terminate this Lease by
delivering written notice of such termination to Landlord within six (6) business days following the date specified in Paragraph 1.7 above. Time is of the essence as to the delivery of such termination notice. If such termination notice is not
timely delivered by Lessee to Lessor as provided in this Paragraph above, then Lessee shall be deemed to have waived its right to terminate this Lease pursuant to this Section 3.1 and Landlord shall be deemed to have delivered the Premises to
Tenant. If Tenant timely delivers its notice of termination to Landlord pursuant to this Paragraph 3.1, then all prepaid Base Rent and Security Deposit paid by Tenant to Landlord shall be promptly returned to Tenant. 

  
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 3.2 Commencement Date. The term of this Lease (“Lease Term”) shall be for the
period specified in Paragraph 1.6 above, commencing on the Commencement Date set forth in Paragraph 1.8 above and expiring, unless earlier terminated or extended pursuant to the terms of this Lease, on the Ending Date set forth in
Paragraph 1.9 above. When the Commencement Date and Ending Date become ascertainable, Landlord and Tenant shall specify the same in writing, in the form of the attached Exhibit D, which writing shall be deemed incorporated
herein. If Tenant fails to execute and deliver the letter attached hereto as Exhibit D within ten (10) business days after Tenant receives written request from Landlord to do so (subject to any legitimate disagreement
by Tenant with the terms thereof, which both parties shall use reasonable efforts to resolve), the letter shall deemed correct as completed by Landlord and binding on Tenant. The expiration of the Lease Term or sooner termination of this Lease is
referred to herein as the “Lease Termination.” 
 3.3 Occupancy Following Delivery Date and Prior to Commencement Date.
Following the Delivery Date and prior to the Commencement Date of the Lease, Tenant and its approved contractors shall have the right to (i) install Tenant’s furniture and furnishings and Tenant’s telephone and telecommunication
wiring and cabling in the Premises, and (ii) subject to the provisions of Paragraphs 13 and 17 below and the Improvement Agreement attached hereto as Exhibit C, construct or install Tenant’s Initial Improvements (as described in
Exhibit C) in the Premises. If Tenant or any of its agents, employees or contractors enter the Premises prior to the Commencement Date as provided above, then such entry shall be upon all the terms and conditions of this Lease (including,
without limitation, Tenant’s obligations regarding indemnity and insurance), except that Tenant shall not be obligated to pay monthly Base Rent (except to the extent provided in the last paragraph of Paragraph 1.10 above) or Tenant’s
percentage share of Operating Expenses prior to the Commencement Date. Prior to Tenant or any of its agents, employees, contractors or other representatives entering any portion of the Premises prior to the Commencement Date, Tenant shall
provide Landlord with evidence that Tenant is maintaining such insurance as is required pursuant to Paragraph 8.2 below. 
 3.4 Option to
Extend Lease Term. Landlord hereby grants to Tenant the option to extend the Lease Term for two (2) additional periods of five (5) years (each an “Extended Term” and collectively, the “Extended Terms”), on the
following terms and conditions: 
 A. Tenant shall give Landlord written notice of its exercise of the option to extend the Lease Term for
the Extended Term no earlier than twelve (12) months nor later than nine (9) months before the date the Lease Term would end but for said exercise. Time is of the essence. If Tenant fails to timely exercise its option to extend the Lease
Term for the first Extended Term, then Tenant waives its right to extend the Lease Term for the second Extended Term. 
 B. Tenant may not
extend the Lease Term pursuant to this Paragraph 3.4 if Tenant is in default, beyond applicable notice and cure periods, in the performance of any of the material terms and conditions of this Lease at the time of Tenant’s notice of exercise of
this option, or if this Lease has been assigned (other than to a Permitted Transferee) or in the event the Premises has been sublet in its entirety for the balance of the Term (other than to a Permitted Transferee). 

C. All terms and conditions of this Lease shall apply during the applicable Extended Term, except that (i) the monthly Base Rent for the
Extended Term shall be determined in accordance with Paragraph 3.4.E below, (ii) there shall be no further rights to extend the Lease Term beyond the Extended Terms referred to in the introductory paragraph of this Paragraph 3.4 above,
(iii) Tenant shall not be entitled to six months of free Base Rent as provided in Paragraph 1.10 above and (iv) Landlord shall have no obligation to construct any tenant improvements on, in or around the Premises or in the Building or to
provide any tenant improvement allowance, refurbishment allowance, preliminary site plan allowance or fit-up allowance. 

  
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 D. Once Tenant delivers notice of its applicable exercise of the option to extend the Lease
Term, Tenant may not withdraw such exercise and, subject to the provisions of this Paragraph 3.4, such notice shall operate to extend the Lease Term. Upon the applicable extension of the Lease Term pursuant to this Paragraph 3.4, the term
“Lease Term” as used in this Lease shall thereafter include the applicable Extended Term and the expiration date of the Lease shall be the expiration date of the applicable Extended Term. 

E. If Tenant elects to extend the Lease Term pursuant to the terms of Paragraph 3.4.A above, the monthly Base Rent for the applicable Extended
Term shall be an amount equal to one hundred percent (100%) of the monthly fair market rental value of the Premises in relation to market conditions at the time of the applicable extension (including, but not limited to, rental rates for comparable
space in Class A office buildings in the North San Jose submarket (“Comparable Buildings”) with comparable tenant improvements and taking into consideration all relevant factors, including, without limitation, any adjustments to rent
based upon direct costs (operating expenses) and taxes, load factors, cost of living or other rental adjustments; rent abatements and other rent concessions; tenant improvement allowances; the relative strength of the tenants; the size of the space;
whether a brokerage commission will be paid; and any other factors which affect market rental values at the time of extension). The Base Rent payable by Tenant during the applicable Extended Term shall include any cost of living or other
inflationary adjustments to occur during the applicable Extended Term that are assumed in the determination of the fair market rental value of the Premises. The monthly Base Rent for the applicable Extended Term shall be determined as follows:: 

1. Mutual Agreement. After timely receipt by Landlord of Tenant’s applicable notice of exercise of the option to extend the Lease
Term, Landlord and Tenant shall have a period of thirty (30) days in which to agree on the monthly Base Rent for the applicable Extended Term. If Landlord and Tenant agree on said monthly Base Rent during that period, they shall immediately
execute an amendment to this Lease stating the monthly Base Rent for the applicable Extended Term. If Landlord and Tenant are unable to agree on the monthly Base Rent for the applicable Extended Term as aforesaid, the provisions of Paragraph 3.4.E.2
immediately below shall apply. 
 2. Appraisal. Within ten (10) days after the expiration of the thirty (30) day period
described in Paragraph 3. 4.E.1 above, each party, at its cost and by giving notice to the other party, shall appoint a licensed commercial real estate broker with at least ten (10) years’ commercial brokerage experience in Santa Clara
County, to determine the fair market rental value of the Premises. If a party does not appoint such a broker within ten (10) days after the other party has given notice of the name of its broker, the single broker appointed shall be the sole
broker and shall set the fair market rental value. The cost of such sole broker shall be borne equally by the parties. If two brokers are appointed by the parties as provided in this Paragraph 3.4.E.2., the two brokers shall each separately
determine the fair market rental value of the Premises within twenty (20) days of the date the last of such two brokers is selected. In addition, during such twenty (20) day period, the two brokers shall select a third broker meeting the
qualifications above who will be required to determine which of the fair market rental valuations determined by the two original brokers is closer to the fair market rental value of the Premises as determined by the third broker. If the parties
cannot agree on the third broker within such twenty day period, then either of the parties to this Lease, by giving ten (10) days’ notice to the other party, may apply to either the presiding judge of the Superior Court of the County of
Santa Clara for the 

  
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selection of a third broker who meets the qualifications stated above. The two original brokers shall submit their respective valuations to the third broker in a sealed envelope within ten
(10) days following the date the third broker is selected. Once the third broker has been selected as provided above, then, as soon as practicable but in any case within twenty (20) days thereafter, the third broker shall select one of the
two fair market rental valuations submitted by the two original brokers selected by the parties, which valuation shall be the one that is closer to the fair market rental value as determined by the third broker. The third broker’s selection
shall be rendered in writing to both Landlord and Tenant and shall be final and binding upon them and shall not be subject to appeal. The parties shall each pay one-half of the costs of the third broker. In
establishing the fair market rental value, the broker or brokers shall take into consideration the factors described in Paragraph 3.4.E above. 

4. Rent. 
 4.1 Base
Rent. Tenant shall pay to Landlord, as rent for the Premises, in advance, on the first day of each calendar month, commencing on the Commencement Date (but subject to the conditional Base Rent abatement referred to in Paragraph 1.10 above) and
continuing throughout the Lease Term, the Base Rent set forth in Paragraph 1.10 above (and Paragraph 3.4 above, if applicable). Base Rent shall be prorated, based on thirty (30) days per month, for any partial month during the Lease Term.
Base Rent shall be payable, except as otherwise expressly set forth in this Lease, without deduction, offset, prior notice or demand in lawful money of the United States to Landlord at the address herein specified for purposes of notice or to such
other persons or such other places as Landlord may designate in writing. Notwithstanding the foregoing, at Tenant’s request Landlord shall provide Landlord’s banking information (“Landlord’s ACH Account Information”) so that
Tenant can pay Base Rent and Additional Rent (as defined below) by Electronic Funds Transfer (EFT) as an Automated Clearing House (“ACH”) transaction. Any such ACH transfers shall be paid by Tenant, from Tenant’s account in a bank or
financial institution designated by Tenant and credited to Landlord’s bank account as Landlord shall have designated in Landlord’s ACH Account Information. Tenant shall not be in default of Tenant’s obligation to pay Base Rent and/or
Additional Rent if and for so long as Tenant shall timely comply with ACH transfer requirements and accurately state Landlord’s ACH Account Information. However, if Tenant shall have timely complied with ACH transfer requirements, but the
applicable funds shall thereafter have been misdirected or not accounted for properly by the recipient bank designated by Landlord, then Tenant shall reasonably cooperate with Landlord in an effort to recover the misdirected funds and the same shall
not relieve Tenant’s obligation to make the payment so transferred (but Tenant shall not be required to be out-of-pocket the applicable payment amount in a
duplicate amount due to such misdirected payment or payment not accounted for properly by the recipient bank), but shall toll the due date for such payment until the applicable funds shall have been located and deposited in Landlord’s bank
account. In the event that Landlord elects to designate a different bank or financial institution into which any ACH transfer is to be deposited, notification of such change and the required documents, instruments, authorizations, and any modified
Landlord’s ACH Account Information, must be delivered to Tenant no later than 30 days prior to the date such change is to become effective. 

4.2 Late Charge. Tenant hereby acknowledges that late payment by Tenant to Landlord of Base Rent will cause Landlord to incur costs not
contemplated by this Lease, the exact amount of which will be extremely difficult to ascertain. Such costs include, but are not limited to, processing and accounting charges, and late charges which may be imposed on Landlord by the terms of any
mortgage or deed of trust covering the Premises. Accordingly, Tenant shall pay to Landlord, as Additional Rent (as defined in Paragraph 4.3 below), without the necessity of prior notice or demand, a late charge equal to five percent (5%) of any
installment of Base Rent or other amount payable by Tenant 

  
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under this Lease which is not received by Landlord within five (5) days after the due date for such installment or payment. Notwithstanding the foregoing, Landlord will not assess a
late charge until Landlord has given written notice of such late payment for the first late payment in any twelve (12) month period and after Tenant has not cured such late payment within three (3) business days from receipt of such
notice. No other notices will be required during the following twelve (12) months for a late charge to be imposed or incurred. The parties hereby agree that such late charge represents a fair and reasonable estimate of the costs Landlord
will incur by reason of late payment by Tenant. In no event shall this provision for a late charge be deemed to grant to Tenant a grace period or extension of time within which to pay any installment of Base Rent or other sum payable by Tenant to
Landlord under this Lease or, subject to the notice and cure period set forth in Paragraph 14.1(a), prevent Landlord from exercising any right or remedy available to Landlord upon Tenant’s failure to pay such installment of Base Rent or other
sum when due, including without limitation the right to terminate this Lease. In the event any installment of Base Rent or other sum payable by Tenant to Landlord under this Lease is not received by Landlord by the due date for such installment,
such installment shall bear interest at the annual rate set forth in Paragraph 34 below, commencing on the date such Base Rent installment or other sum payable under this Lease is due and continuing until such installment or other sum payable
under this Lease is paid in full. 
 4.3 Additional Rent. All taxes, charges, costs and expenses and other sums which Tenant is
required to pay hereunder (together with all interest and charges that may accrue thereon in the event of Tenant’s failure to pay the same), and all damages, costs and reasonable expenses which Landlord may incur by reason of any Default by
Tenant shall be deemed to be additional rent hereunder (“Additional Rent”). Additional Rent shall accrue commencing on the Commencement Date. In the event of nonpayment by Tenant of any Additional Rent, Landlord shall have all the rights
and remedies with respect thereto as Landlord has for the nonpayment of Base Rent. The term “Rentals” as used in this Lease shall mean Base Rent and Additional Rent. 

5. Security Deposit. Within five (5) business days after Tenant’s execution of this Lease, Tenant shall deposit with Landlord
a security deposit (“Security Deposit”) in immediately available funds in the amount set forth in Paragraph 1.13 above. The Security Deposit shall be held by Landlord as security for the faithful performance by Tenant of each and
every term, covenant and condition of this Lease applicable to Tenant, and not as prepayment of Base Rent or Additional Rent. If Tenant shall at any time fail to keep or perform any term, covenant or condition of this Lease applicable to Tenant,
including without limitation, the payment of any Rentals or those provisions requiring Tenant to repair damage to the Premises caused by Tenant or to surrender the Premises in the condition required pursuant to Paragraph 35 below, and any such
failure continues after the passage of any applicable notice and cure period, Landlord may, but shall not be obligated to, and without waiving or releasing Tenant from any obligation under this Lease, use, apply or retain so much of the Security
Deposit reasonably necessary for the payment of any amount which Landlord may spend by reason of Tenant’s uncured default or as necessary to compensate Landlord for any loss or damage which Landlord may suffer by reason of Tenant’s uncured
default. In the event Landlord uses or applies any portion of the Security Deposit, Tenant shall, within five (5) business days after receipt of written demand by Landlord, remit to Landlord sufficient funds to restore the Security Deposit to
its original sum. Failure by Tenant to so remit funds shall be a Default by Tenant. Tenant waives any restriction on the uses to which the Security Deposit or any portion thereof may be put contained in California Civil Code Section 1950.7 and
Tenant hereby agrees that such Security Deposit may be applied against, among other things, delinquent rents accruing prior to termination of this Lease and future rent damages under California Civil Code Section 1951.2. Tenant also waives the
provisions of California Civil Code Section 1950.7, and all other provisions of law now or hereafter in force, that provide that Landlord may claim from the Security Deposit only those 

  
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sums reasonably necessary to remedy defaults in the payment of rent, to repair damage caused by Tenant or to clean the Premises. Without limiting the generality of the foregoing, Tenant expressly
agrees that if Landlord terminates this Lease due to Tenant’s Default or if Tenant terminates this Lease in a bankruptcy proceeding, Landlord shall be entitled to hold the Security Deposit until the amount of damages recoverable pursuant to
California Civil Code Section 1951.2 is finally determined. Except as provided above, within thirty (30) days following the later of the expiration of the Term or Tenant vacating possession of the Premises and surrendering the same to
Landlord, the Security Deposit or any balance thereof, less any amount that has been or can be applied by Landlord as a result of any uncured Default by Tenant under this Lease, shall be returned to Tenant or, at the option of Landlord, to the last
assignee of Tenant’s interest in the Lease. If Landlord sells or transfers its interest in the Premises during the Term and deposits with the purchaser or credits to the purchaser the Security Deposit or balance of it, then, upon such sale or
transfer, Landlord shall be discharged from any further liability with respect to the Security Deposit. Notwithstanding anything in this Lease to the contrary, the Security Deposit may be in the form of cash or a letter of credit as more fully
described in below. 
 6. Use of Premises. 

6.1 Permitted Uses. Tenant shall use the Premises, and permit the use of the Premises, only in conformance with applicable governmental
or quasi-governmental laws, statutes, orders, regulations, rules, ordinances and other requirements now or hereafter in effect (collectively, “Laws”) for the purposes set forth in Paragraph 1.11 above, and for no other purpose without
the prior written consent of Landlord, which consent shall not be unreasonably withheld or delayed, provided that such other use is in conformance with applicable Laws. Tenant shall not permit the use of the Premises for any purpose other than as
set forth in Paragraph 1.11. Tenant acknowledges and agrees that Landlord has selected or will be selecting tenants for the Building in order to produce a mix of tenant uses compatible and consistent with the design integrity of the Building and
with other uses of the Building; provided, however, the selection of Building tenants shall be in Landlord’s reasonable discretion (subject, however, to the provision of Paragraph 6.1(a) below), and Landlord in making such selection shall not
be deemed to be warranting that any use of the Building made by any such tenant is compatible or consistent with the design integrity of the Building or other uses of the Building. Any change in use of the Premises for any purpose other than those
permitted by this Lease without the prior written consent of Landlord shall be a Default by Tenant. Tenant and its Tenant’s agents, employees, officers, directors, members, managers, partners, licensees, invitees, contractors,
subcontractors, successors, representatives, guests, customers, suppliers and affiliated companies (collectively, “Tenant Related Parties”) shall use the Premises and the Common Area, in compliance with all applicable Laws and in
conformity with the provisions of all recorded documents, including, without limitation, any recorded declaration of covenants, conditions, and restrictions, affecting the Premises and/or Common Area; provided that no future recorded documents shall
materially restrict or interfere with Tenant’s use of the Premises in the manner contemplated by this Lease, increase the costs or expenses relating to such use in any material respect, and the reasonable exercise by Tenant of its rights and
privileges under this Lease, in accordance with the terms of this Lease, should not conflict with or contravene the terms of such future recorded declarations. 

(a) Competitors. To the extent Landlord is not prohibited by any existing or future law, and provided Tenant is not in default under
this Lease beyond any applicable notice and cure period and the original Tenant (or any Permitted Transferee, as defined in Paragraph 24.4 below)) hereunder occupies at least two (2) full floors of the Premises, Landlord covenants not to enter
into a new lease or occupancy agreement (an “Occupancy Agreement”) for any space in the Project with a Competitor (as hereinafter defined) for term scheduled to commence during the Term of this Lease or

  
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any extension or renewal thereof. For purposes of the immediately preceding sentence, a “Competitor” shall mean any of the entities identified on Exhibit M attached hereto and
incorporated by reference herein. Tenant shall have the right, from time to time during the Term, to modify the list of entities constituting Competitors on Exhibit M by adding or deleting Competitors, provided that no entity shall be added
to the Exhibit M list of Competitors without Landlord’s prior written consent. “Competitor” shall not in any event include: (i) a tenant whose lease (a “Prior Lease”) is dated prior to the date of this Lease or
any assignee, sublessee or licensee of any such tenant if, pursuant to Law or the terms of such Prior Lease, Landlord acting reasonably, lacked the authority to prevent such assignment, sublease or license transaction, or (ii) a tenant who by
order of the U.S. Bankruptcy Court or similar state court order assumed a lease or otherwise has been permitted to operate its business in the Building based upon or as a result of a bankruptcy, insolvency or similar action, or (iii) a business
operated by Tenant, its parent corporation, wholly owned subsidiary corporation or affiliated corporation. 
 6.2 Tenant to Comply with
Legal Requirements. Tenant shall, at its sole cost, promptly comply with all Laws (as defined in Paragraph 6.1 above) relating to or affecting Tenant’s and/or Tenant Related Parties’ particular use or occupancy of the Premises or use
of the Common Area, now in force, or which may hereafter be in force, including without limitation those relating to utility usage and load or number of permissible occupants or users of the Premises, whether or not the same are now contemplated by
the parties; with the provisions of all recorded documents affecting the Premises and/or the Common Area insofar as the same relate to or affect Tenant’s particular and unique use or occupancy of the Premises or use of the Common Area; and with
the requirements of any board of fire underwriters (or similar body now or hereafter constituted) relating to or affecting Tenant’s or any of the Tenant Related Parties’ particular and unique use or occupancy of the Premises or use of the
Common Area. For purposes of this Lease, “Tenant’s particular and use of the Premises” shall mean Tenant’s use of the Premises for other than customary and ordinary general office use. Tenant’s obligations pursuant to this
Paragraph 6.2 shall include, without limitation, maintaining or restoring the Premises, and making structural and non-structural alterations and additions in compliance and conformity with all Laws and
recorded documents, each relating to (i) Tenant’s particular use or occupancy of the Premises during the Lease Term, as the same may be extended, (ii) Tenant’s application for any permit or governmental approval or alterations,
additions or improvements made to the Premises by Tenant or any Tenant Related Parties, or (iii) any negligence or willful misconduct of Tenant or any Tenant Related Parties. Any alterations or additions undertaken by Tenant pursuant to this
Paragraph 6.2 shall be subject to the requirements of Paragraph 13.1 below. At Landlord’s option, Landlord may make the required alteration, addition or change, and Tenant shall pay Landlord’s actual and reasonable cost thereof
as Additional Rent within thirty (30) days after receipt of Landlord’s invoice therefor accompanied by reasonable supporting documentation. With respect to any capital improvements (other than capital repairs or replacements of the
Building Structure, which shall be the sole obligation of Landlord to perform and pay for without right of reimbursement from Tenant unless such capital repairs or replacements are required due to damage (other than ordinary wear and tear) caused by
the acts, omissions, negligence or willful misconduct or misuse of the Premises or Building, or applicable portion thereof, by Tenant or any Tenant Related Parties, in which event, subject to Paragraph 8.6 below, Tenant shall be obligated to pay or
reimburse Landlord for 100% of the cost of such repair or replacement within thirty (30) days after receipt of Tenant’s invoice therefore accompanied by reasonable supporting documentation) as may be hereafter required with respect to the
Building, Premises or Common Area due to a change in laws and unrelated to Tenant’s and/or any of the Tenant Related Parties’ particular and unique use of the Premises or the Common Area, Tenant’s application(s) for any permit or
governmental approval for alterations, additions or improvements to the Premises by or on behalf of Tenant or any Tenant Related Parties, the cost thereof shall be amortized at the lesser of (i) the annual rate of interest charged on the loan
obtained by Landlord to finance the applicable capital improvement(s) (or if 

  
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Landlord does not obtain a loan to finance such capital improvement(s), then at two (2) percent above the prime rate or reference rate published in the Wall Street Journal (or if such rate
is not published in the Wall Street Journal, then the prime rate or reference rate established by a national bank selected by Landlord)), or (ii) the maximum rate permitted by law, over the useful life of the capital improvement(s), as
reasonably determined by Landlord in accordance with generally accepted real estate accounting principles, consistently applied, and Tenant shall pay its percentage share (as defined in Paragraph 1.12 above) of such monthly amortized cost on the
first day of each month (prorated for any partial month) from the date of installation or repair through the earlier of the expiration of the useful life of the capital improvement and Lease Termination. For avoidance of doubt, notwithstanding
anything to the contrary contained in this Lease, Tenant shall not be required to construct or pay the cost of complying with any covenants, conditions or restrictions, Laws or insurance underwriter’s requirements requiring construction of
improvements to the Premises or to any other portion of the Building or Common Areas, unless such compliance is necessitated solely because of Tenant’s particular and unique use of the Premises, Tenant’s application for any permit or
governmental approval to construct alterations, additions or improvements, any alterations, additions or improvements made to the Premises by Tenant or any Tenant Related Party or any negligence or willful misconduct of Tenant or any Tenant Related
Parties. 
 For purposes of Section 1938(a) of the California Civil Code, Landlord hereby discloses to Tenant, and Tenant hereby
acknowledges, that the Premises have not undergone inspection by a Certified Access Specialist (CASp). As required by Section 1938(e) of the California Civil Code, Landlord hereby states as follows: “A Certified Access Specialist (CASp)
can inspect the subject premises and determine whether the subject premises comply with all of the applicable construction-related accessibility standards under state law. Although state law does not require a CASp inspection of the subject
premises, the commercial property owner or lessor may not prohibit the lessee or tenant from obtaining a CASp inspection of the subject premises for the occupancy or potential occupancy of the lessee or tenant, if requested by the lessee or tenant.
The parties shall mutually agree on the arrangements for the time and manner of the CASp inspection, the payment of the fee for the CASp inspection, and the cost of making any repairs necessary to correct violations of construction-related
accessibility standards within the premises.” In furtherance of the foregoing, Landlord and Tenant hereby agree that in the event Tenant elects to perform a CASp inspection of the Premises hereunder, such CASP inspection shall be conducted, at
Tenant’s sole cost and expense, by a CASp designated by Landlord, subject to Landlord’s reasonable rules and requirements and Tenant shall be solely responsible for the cost of any repairs, upgrades, alterations, improvements and/or
modifications to the Premises or the Building necessary to correct any such violations of construction-related accessibility standards identified by such CASp inspection as required by Law, which repairs, upgrades, alterations, improvements and/or
modifications may at Landlord’s option, be performed by Landlord at Tenant’s expense, payable as Additional Rent within ten (10) days following Landlord’s demand. The terms of this Paragraph 6.2 with respect to CASp shall only
apply in the event that Tenant exercises its right to perform a CASp inspection of the Premises. Otherwise, the terms of this Lease shall apply, without limitation, to the compliance, repairs and maintenance obligations of the parties. 

Tenant shall obtain prior to its or any of its employees taking possession or occupancy of the Premises any and all permits, licenses and/or
other authorizations required for the lawful operation of its business at the Premises. The judgment of any court of competent jurisdiction or the admission of Tenant in any action or proceeding against Tenant, regardless of whether Landlord is a
party thereto or not, that Tenant has violated such Law relating to Tenant’s or any Tenant Related Parties’ particular use or occupancy of the Premises or use of the Common Area shall be conclusive of the fact of such violation by Tenant.

  
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 6.3 Prohibited Uses. Tenant shall not commit or permit any Tenant Related Parties to
commit any waste upon the Premises or Common Area (or any area where Tenant places its Generators or Bloom Boxes to the extent permitted under this Lease). Tenant and Tenant Related Parties shall not do or permit anything to be done in the Premises
or do or permit anything to be done by any of them in other parts of the Building, Project or Common Area which will unreasonably obstruct or interfere with the rights of any other tenants of the Building or Project, other authorized users of the
Common Area, or occupants of neighboring property, or injure or unreasonably annoy them. Tenant shall not conduct or permit any auction or sale open to the public to be held or conducted on or about the Premises, Building, Project or Common Area.
Tenant and all Tenant Related Parties shall not use or allow the Premises to be used for any unlawful or hazardous purpose, nor shall Tenant or any Tenant Related Parties cause, maintain, or permit any nuisance in, on or about the Premises,
Building, Project or Common Area. Tenant shall not overload existing electrical systems or other mechanical equipment servicing the Building, impair the efficient operation of the sprinkler system or the heating, ventilation or air conditioning
equipment within or servicing the Building or Premises or damage, overload or corrode the sanitary sewer system. Tenant and Tenant Related Parties shall not do or permit anything to be done in or about the Premises nor bring or keep anything in the
Premises which will in any way increase the rate of any insurance upon any portion of the Project or any of its contents, or cause a cancellation of any insurance policy covering any portion of the Project or any of its contents, nor shall Tenant or
any Tenant Related Parties keep, use or sell or permit to be kept, used or sold in or about the Premises any articles which may be prohibited by a standard form policy of fire insurance. In the event the rate of any insurance upon any portion of the
Project or any of its contents is increased because of Tenant’s particular use of the Premises or that of any Tenant Related Parties, Tenant shall pay, as Additional Rent, the full cost of such increase; provided, however this provision shall
in no event be deemed to constitute a waiver of Landlord’s right to declare a default hereunder by reason of the act or conduct of Tenant or any Tenant Related Parties causing such increase or of any other rights or remedies of Landlord in
connection therewith. Tenant and Tenant Related Parties shall not place any loads upon the floor, walls or ceiling of the Premises which would endanger the Building or the structural elements thereof or of the Premises, nor place any harmful liquids
in the drainage system of the Building or Common Area. No waste materials or refuse shall be dumped upon or permitted to remain upon any part of the Project except in enclosed trash containers designated for that purpose by Landlord. Except as
expressly permitted by this Lease with respect to Bloom Boxes and Generators (and then subject to the provisions of Paragraphs 48 and 49 below), no materials, supplies, equipment, finished products (or semi-finished products), raw materials, or
other articles of any nature shall be stored upon, or be permitted to remain on, any portion of the Project outside the Premises. 
 6.4
Hazardous Materials. Tenant shall not cause or permit, or allow any of the Tenant Related Parties to cause or permit, the introduction, placement, use, storage, manufacture, transportation, release or disposition (collectively
“Release”) of any Hazardous Material(s) (defined below) on or about any portion of the Project without the prior written consent of Landlord, which consent may be withheld in the sole and absolute discretion of Landlord without any
requirement of reasonableness in the exercise of that discretion Notwithstanding the immediately preceding sentence to the contrary, Tenant may use de minimis quantities of the types of materials which are technically classified as Hazardous
Materials but commonly used in domestic or office use to the extent not in an amount, which, either individually or cumulatively, would be a “reportable quantity” under any applicable Law. Tenant covenants that, at its sole cost and
expense, Tenant will comply, and cause its agents, employees, contractors, sublessees, licensees and invitees to comply, with all applicable Laws with respect to the Release by Tenant, its agents, employees, contractors, sublessees, licensees or
invitees of such permitted Hazardous Materials. Any Release beyond the scope allowed in this paragraph shall be 

  
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subject to Landlord’s prior consent, which may be withheld in Landlord’s sole and absolute discretion, and shall require an amendment to the Lease in the event Landlord does consent
which shall set forth the materials, scope of use, indemnification and any other matter required by Landlord in Landlord’s sole and absolute discretion. Tenant shall indemnify, defend and hold Landlord and Landlord’s agents, members and
lenders harmless from and against any and all claims, losses, damages, liabilities, actions, causes of action, clean up and remediation costs, penalties, liens, costs and/or expenses arising in connection with the Release of Hazardous Materials by
Tenant, any Tenant Related Parties or any other person using the Premises with Tenant’s knowledge and consent or authorization; provided, however, in no event shall the foregoing be construed as requiring Tenant to indemnify, defend, protect or
hold harmless the Landlord for any claims, losses, damages, liabilities, actions, causes of action, clean up and remediation costs, penalties, liens, costs and/or expenses to the extent caused by the negligence or willful misconduct of Landlord or
its employees, contractors or agents. Tenant’s obligation to defend, hold harmless and indemnify pursuant to this Paragraph 6.4 shall survive Lease Termination. Notwithstanding the foregoing or anything to the contrary contained in this
Lease, under no circumstance shall Tenant be liable for any losses, costs, claims, liabilities or damages (including attorneys’ and consultants’ fees) of any type or nature, directly or indirectly arising out of or in connection with any
Hazardous Materials present at any time on, in, under or about the Premises, the Building or the Project, or the soils, surface water or groundwater thereof, or the violation of any environmental laws, except to the extent that any of the foregoing
actually results from the Release of Hazardous Materials, or exacerbated of then existing Hazardous Materials, by Tenant or any Tenant Related Party. 

The foregoing indemnity, defense and hold harmless obligation shall not apply to, and Tenant shall not be responsible for, the presence of
Hazardous Materials on, under, or about the Premises, Building or Common Area, or the soils, surface or groundwater thereunder, to the extent caused by any third parties (i.e. persons or entities other than Tenant or Tenant Related Parties) or by
Landlord or Landlord’s employees, agents or contractors unless and to the extent such Hazardous Materials are exacerbated by the acts of Tenant or any Tenant Related Parties. 

As used in this Lease, the term “Hazardous Materials” means any chemical, substance, waste or material which has been or is
hereafter determined by any federal, state or local governmental authority to be capable of posing risk of injury to health or safety, including without limitation, those substances included within the definitions of “hazardous
substances,” “hazardous materials,” “toxic substances,” or “solid waste” under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, the Resource Conservation and Recovery Act of 1976,
and the Hazardous Materials Transportation Act, as amended, and in the regulations promulgated pursuant to said laws; those substances defined as “hazardous wastes” in section 25117 of the California Health & Safety Code, or
as “hazardous substances” in section 25316 of the California Health & Safety Code, as amended, and in the regulations promulgated pursuant to said laws; those substances listed in the United States Department of
Transportation Table (49 CFR 172.101 and amendments thereto) or designated by the Environmental Protection Agency (or any successor agency) as hazardous substances (see, e.g., 40 CFR Part 302 and amendments thereto); such
other substances, materials and wastes which are or become regulated or become classified as hazardous or toxic under any Laws, including without limitation the California Health & Safety Code, Division 20, and Title 26 of the
California Code of Regulations; and any material, waste or substance which is (i) petroleum, (ii) asbestos, (iii) polychlorinated biphenyls, (iv) designated as a “hazardous substance” pursuant to section 311 of the
Clean Water Act of 1977, 33 U.S.C. sections 1251 et seq. (33 U.S.C. § 1321) or listed pursuant to section 307 of the Clean Water Act of 1977 (33 U.S.C. § 1317), as amended; (v) flammable explosives;
(vi) radioactive materials; or (vii) radon gas. 

  
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 Landlord has delivered or made available to Tenant the environmental reports identified on
Exhibit H attached hereto (the “Environmental Reports”). Landlord hereby represents to Tenant as of the date of execution of this Lease, that, to the current actual knowledge of Landlord, except as otherwise set forth in any of the
environmental reports identified on Exhibit H and/or disclosed to Tenant in writing, there are no Hazardous Materials in, on or under the Premises, Building or Common Area in violation of applicable environmental laws. For purposes of the
immediately preceding sentence, the phrase “to the current actual knowledge of Landlord” shall mean the current, actual knowledge of (i) Mark Regoli (who, as of the date of this Lease, has an indirect ownership interest in the Project
and in South Bay Development Company, the current property manager for the Project and is an Executive Vice-President of South Bay Development Company), as of the date of execution of this Lease by Landlord, (ii) David Andris (who, as of the
date of this Lease has an indirect ownership interest in the Project and is an Executive Vice-President of South Bay Development Company) as of the date of execution of this Lease by Landlord, and (iii) the Managing Member of Landlord, without
any investigation or duty of inquiry, and without any knowledge of any other person being imputed to Mark Regoli or the Managing Member. Neither Landlord, Mark Regoli, David Andris nor the Managing Member) shall be charged with constructive,
inquiry, imputed or deemed knowledge. In the event of any breach of any representation or warranty of Landlord set forth herein, Tenant agrees that Mark Regoli, David Andrus and the Managing Member(s) shall not be personally liable for any damages,
losses, liabilities, claims, costs or expenses suffered or incurred by Buyer in connection with such breach of such representation or warranty. 

Landlord shall indemnify, defend and hold harmless Tenant from and against any and all obligations to monitor, clean up or remediate any
Hazardous Materials (i) existing on, in or under the Project, or any part thereof, as of the date of this Lease and/or (ii) released, spilled, discharged or caused to be present by Landlord or any of Landlord’s agents, employees or
contractors on, in or under the Project; provided, however, in no event shall the foregoing be construed as requiring Landlord to indemnify, defend or hold harmless Tenant from and against any and all obligations to monitor, clean up or remediate
any Hazardous Materials to the extent such Hazardous Materials referred to in clause (i) or (ii) immediately above are exacerbated by the negligence or willful misconduct of Tenant or any of its agents, employees, affiliates, officers,
directors, shareholders, partners, managers, members, contractors, subcontractors, consultants or other representatives. Landlord’s obligation to defend, hold harmless and indemnify pursuant to this paragraph shall survive Lease Termination.

 Landlord shall have the right, upon reasonable advance notice to Tenant, to inspect, investigate, sample and/or monitor the Premises, the
Building, Common Area and/or any other part of the Project, including any soil, water, groundwater, or other sampling, to the extent reasonably necessary to determine whether Tenant and/or the Tenant Related Parties are complying with the terms of
this Lease with respect to Hazardous Materials. In connection therewith, Tenant shall provide Landlord with reasonable access to all portions of the Premises; provided, however, that Landlord shall avoid any unreasonable interference with the
operation of Tenant’s business on the Premises. In the event that such inspections, investigations, sampling and/or monitoring reasonably indicate that Tenant or any Tenant Related Parties has violated any of its covenants or agreements set
forth in this Paragraph 6.4, then all costs incurred by Landlord in performing such inspections, investigation, sampling and/or monitoring with respect thereto shall be reimbursed by Tenant to Landlord as Additional Rent within ten (10) days
after Landlord’s demand for payment. 

  
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 7. Taxes. 

7.1 Personal Property Taxes. Tenant shall cause Tenant’s trade fixtures, equipment, furnishings, furniture, merchandise, inventory,
machinery, appliances and other personal property installed or located on the Premises and Tenant’s Generators and Bloom Boxes placed within portions of the Common Area to the extent permitted pursuant to the terms of this Lease (collectively
the “personal property”) to be assessed and billed separately from the Land and the Building. Tenant shall pay, or cause to be paid, before delinquency any and all taxes, assessments and public charges levied, assessed or imposed upon or
against Tenant’s personal property. If any of Tenant’s personal property shall be assessed with the Land or the Building, Tenant shall pay to Landlord, as Additional Rent, the amounts attributable to Tenant’s personal property within
thirty (30) days after receipt of a written statement from Landlord setting forth the amount of such taxes, assessments and public charges attributable to Tenant’s personal property. Tenant shall comply with the provisions of any Law which
requires Tenant to file a report of Tenant’s personal property located on the Premises. 
 7.2 Other Taxes Payable Separately by
Tenant. Tenant shall pay (or reimburse Landlord, as Additional Rent, if Landlord is assessed), prior to delinquency or within thirty (30) days after receipt of Landlord’s statement thereof, any and all taxes, levies, assessments or
surcharges payable by Landlord or Tenant and relating to this Lease or the Premises (other than Landlord’s net income, succession, transfer, sales, gift, franchise, estate or inheritance taxes, and Taxes, as that term is defined in
Paragraph 7.3(a) below, payable as an Operating Expense), whether or not now customary or within the contemplation of the parties hereto, whether or not now in force or which may hereafter become effective, including but not limited to: 

(a) A sales tax, use tax, or other tax upon or measured by the area of the Premises or by the Rentals payable hereunder levied by the state,
any political subdivision thereof, city or federal government with respect to the receipt of such Rentals; 
 (b) Any tax or assessment
(1) assessed upon the use, possession occupancy, leasing, operation and management by Tenant of the Premises or any portion thereof and (2) assessed by the governmental taxing authorities separately from the balance of the Building and
Parcel C shown on the Parcel Map or itemized on the applicable property tax bill separately from the balance of the Property; 
 (c) Any tax
upon or with respect to Tenant’s use or occupancy of the Premises, or any portion thereof; 
 (d) Any tax upon this transaction or any
document to which Tenant is a party creating or transferring an interest or an estate in the Premises. 
 Tenant shall also pay, prior to
delinquency, all privilege, sales, excise, use, business, occupation, or other taxes, assessments, license fees, or charges levied, assessed or imposed upon, or required to be collected by, Tenant in connection with, Tenant’s business
operations conducted at the Premises. 
 In the event any such taxes are payable by Landlord and it shall not be lawful for Tenant to
reimburse Landlord for such taxes, then the Rentals payable hereunder shall be increased to net Landlord the same net Rental after imposition of any such tax upon Landlord as would have been payable to Landlord prior to the imposition of such tax.

  
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 7.3 Common Taxes. 

(a) Definition of Taxes. The term “Taxes” as used in this Lease shall collectively mean (to the extent any of the following
are not paid by Tenant pursuant to Paragraphs 7.1 and 7.2 above) all real estate taxes and general and special assessments (including, but not limited to, assessments for public improvements or benefit); personal property taxes; taxes based on
vehicles utilizing parking areas on the Land; taxes computed or based on rental income or on the square footage of the Premises or the Building (including without limitation any municipal business tax but excluding federal, state and municipal net
income taxes); increases in real property taxes arising from a change in ownership of Parcel A and/or Parcel C as shown on the Parcel Map, or applicable portion thereof, or new construction; environmental surcharges; excise taxes; gross rental
receipts taxes; sales and/or use taxes; employee taxes; water and sewer taxes, levies, assessments and other charges in the nature of taxes or assessments (including, but not limited to, assessments for public improvements or benefit); and all other
governmental, quasi-governmental or special district impositions of any kind and nature whatsoever; regardless of whether any of the foregoing are now customary or within the contemplation of the parties hereto and regardless of whether resulting
from increased rate and/or valuation, or whether extraordinary or ordinary, general or special, unforeseen or foreseen, or similar or dissimilar to any of the foregoing and which during the Lease Term are laid, levied, assessed or imposed upon
Landlord and/or become a lien upon or chargeable against any portion of the applicable real property under or by virtue of any present or future laws, statutes, ordinances, regulations, or other requirements of any governmental, quasi-governmental
or special district authority whatsoever. The term “environmental surcharges” shall include any and all expenses, taxes or charges imposed by the Federal Department of Energy, Federal Environmental Protection Agency, the Federal Clean Air
Act, or any regulations promulgated thereunder, or imposed by any other local, state or federal governmental agency or entity now or hereafter vested with the power to impose taxes, assessments or other types of surcharges as a means of controlling
or abating environmental pollution or the use of energy or any natural resource in regard to the use, operation or occupancy of the applicable real property. The term “Taxes” shall include (to the extent the same are not paid by Tenant
pursuant to Paragraphs 7.1 and 7.2 above), without limitation, all taxes, assessments, levies, fees, impositions or charges levied, imposed, assessed, measured, or based in any manner whatsoever upon or with respect to the use, possession,
occupancy, leasing, operation or management of the applicable real property or in lieu of or equivalent to any Taxes set forth in this Paragraph 7.3(a). Notwithstanding anything to the contrary in this Lease, “Taxes” shall not include
and Tenant shall not be required to pay any portion of any tax or assessment expense or increase therein attributable to Landlord’s succession, franchise, inheritance, gift, transfer, estate or state taxes or any net income, transfer, capital
stock, gift, estate or inheritance tax, any deed stamps or mortgage taxes, or any interest or penalties for late payment of any taxes, or any development or impact fees and any Taxes imposed upon or relating to the Parcel B Building or Parcel B as
shown on the Parcel Map. As used in this Lease, “Building Taxes” shall mean Taxes imposed, levied or assessed solely upon or solely relating to the Building (and the leasehold improvements therein and/or thereon) and Parcel C as shown on
the Parcel Map, and “Parcel A Taxes” shall mean the Taxes that would have been assessed or imposed solely upon or solely relating to Parcel A as shown on the Parcel Map and the Common Area improvements thereon and that are equitably
allocated by the Santa Clara County Assessor’s Office to Parcel B and Parcel C, respectively, as shown on the Parcel Map and the improvements thereon. It is contemplated that the Taxes allocable to APN: 015-39-055 (which APN: 015-39-055 consists of Parcels A, B and C on the Parcel Map) will be segregated or allocated to APNs: 015-39-057 (which is Parcel B on the Parcel Map) and 015-39-058 (which is Parcel C on the
Parcel Map) for the fiscal tax year 2018-2019. If the Lease Term commences prior to such segregation or allocation occurring, then, as of the date the Lease Term commences and until such segregation and allocation has occurred, Landlord shall
equitably allocate a portion of the Taxes levied or assessed against APN 015-39-055 to Parcel C as shown on the Parcel Map and the Parcel C Building and Tenant shall be
obligated to pay Tenant’s percentage share of such Taxes so equitably allocated to Parcel C and the Parcel C Building. For avoidance of doubt, Building Taxes and Taxes allocable or attributable to Parcel C shall not include, and Tenant shall
not be responsible for payment of: (a) estate, inheritance, succession, transfer, gift or franchise taxes of 

  
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Landlord or any federal, state or local net income, sales or transfer tax, (b) penalties and interest, other than those attributable to Tenant’s failure to timely comply with its
obligations pursuant to this Lease, or (c) any Real Property Taxes in excess of the amount which would be payable if such tax or assessment expense were paid in installments over the longest possible term. 

(b) Operating Expense. Operating Expenses shall include Building Taxes for the tax periods (or applicable portions thereof) occurring
during the Term, which Building Taxes shall include, without limitation, an equitable percentage of the Taxes allocable or attributable to Parcel A as shown on the Parcel Map and the surface parking and other improvements now or hereafter situated
on Parcel A (as determined by the County of Santa Clara Tax Assessor) for such tax periods. Tenant shall pay as Additional Rent each month during the Lease Term 1/12th of its annual share of such Taxes, based on Landlord’s estimate thereof,
pursuant to Paragraph 12 below. Tenant’s share of any such Taxes during any partial tax fiscal year(s) within the Lease Term shall be prorated according to the ratio which the number of days during the Lease Term during such partial tax
fiscal year bears to 365. 
 8. Insurance; Indemnity; Waiver. 

8.1 Insurance by Landlord. Landlord shall, during the Lease Term, procure and keep in force the following insurance, the cost of which
with respect to the Building and/or Parcel C may be included in Operating Expenses and with respect to the Exterior Common Areas may be included in Exterior Common Area Operating Expenses (in both cases, subject to any applicable limitations or
exclusions set forth elsewhere in this Lease), payable by Tenant pursuant to Paragraph 12 below: 
 (a) Property Insurance.
“Special Form” or “all risk” property insurance, covering (or equitably allocated by Landlord to) the Building (and leasehold improvements constructed therein or thereon by Landlord and the Initial Improvements following
substantial completion thereof and any other leasehold improvements funded by any allowance given to any tenant of the Building) and other buildings located within the Project (and improvements located with the Common Area to the extent desired to
be insured by Landlord). Such insurance shall be in the full amount of the replacement cost of the foregoing, with reasonable deductible amounts, which deductible amounts with respect to the Building may be included in Operating Expenses and with
respect to the Exterior Common Areas may be included in Exterior Common Area Operating Expenses (in both cases, subject to any applicable limitations or exclusions set forth elsewhere in this Lease), payable by Tenant pursuant to Paragraph 12.
Such insurance may also include rental income insurance, insuring that one hundred percent (100%) of the Rentals (as the same may be adjusted hereunder) will be paid to Landlord for a period of up to twelve (12) months if the Premises are
destroyed or damaged, or such longer period as may be determined by Landlord or required by any beneficiary of a deed of trust or any mortgagee of any mortgage affecting the Premises. Landlord may so insure the Project separately, or may insure the
Project with other property owned by Landlord which Landlord elects to insure together under the same policy or policies. Landlord shall have the right, but not the obligation, in its sole and absolute discretion, to obtain insurance for such
additional perils that Landlord deems appropriate, including, without limitation, coverage for damage by earthquake and/or flood and/or terrorism insurance. Such insurance maintained by Landlord as provided herein shall not cover any leasehold
improvements installed in the Premises by Tenant at its sole expense (but Landlord shall maintain insurance covering the Initial Improvements referred to in Exhibit C attached hereto following the substantial completion of such Initial
Improvements), or Tenant’s equipment, trade fixtures, inventory, furniture, furnishings or other personal property located on or in the Premises; 

  
 -21- 

 (b) Liability Insurance. Commercial general liability (lessor’s risk) insurance
against any and all claims for personal injury, death or property damage occurring in or about the Land, Building or Project (subject to such limitations or exclusions as are set forth in such commercial general liability insurance policy). Such
insurance shall be on an occurrence basis and shall be in an amount as determined by Landlord, but commensurate with liability insurance carried by reasonably prudent owners of Comparable Buildings. Such commercial general liability insurance may
cover the Project and, in such instance, Landlord shall equitably allocate the cost of such insurance to the Building and Exterior Common Area; and 

(c) Other. Such other commercially reasonable insurance as Landlord reasonably deems necessary and prudent. In no event shall the
limits of any policies maintained by Landlord be considered as limiting the liability of Landlord under this Lease. 
 8.2 Insurance by
Tenant. Tenant shall, during the Lease Term, at Tenant’s sole cost and expense, procure and keep in force the following insurance: 

(a) Personal Property Insurance. “Special Form” or “all risk” property insurance on all leasehold improvements
installed in the Premises by Tenant at its sole expense (if any), and on all equipment, trade fixtures, inventory, fixtures, office furniture and personal property located on or in the Premises, including improvements, alterations, additions or
fixtures hereinafter constructed or installed on the Premises by Tenant or Tenant’s agents, employees, contractors or subcontractors (but including, without limitation, Tenant’s furniture, fixtures, telephone equipment, computer wiring,
security system, and signage). Such “Special Form” or “all risk” insurance also shall cover Tenant’s Generators and Bloom Boxes placed in portions of the Common Area to the extent permitted pursuant to the terms of this
Lease. Such insurance shall also provide coverage for water damage from any cause whatsoever, including, but not limited to, back up or overflow from sprinkler leakage, bursting, leaking or stoppage of any pipes, explosion and back up of sewers and
drainage. Such insurance shall be in an amount equal to the full replacement cost of the aggregate of the foregoing and shall provide coverage comparable to (or better than) the coverage afforded under policies using the ISO Special Causes of Loss
Form (CP 10 30) or on an All Risk or Special Perils form. Such insurance shall also provide coverage for water damage. Landlord shall have no obligation to insure, or to protect against theft or damage, any personal property or equipment
placed or installed in any portion of the Premises by Tenant or any Tenant Related Parties. 
 (b) Liability Insurance. Commercial
general liability insurance against any and all claims for personal injury, death or property damage occurring in or about the Premises or arising out of Tenant’s or any Tenant Related Parties’ use of the Common Area, use or occupancy of
the Premises or Tenant’s or any of Tenant Related Parties’ operations on or in the Premises. Such insurance shall be on an occurrence basis and have a combined single limit of not less than Five Million Dollars ($5,000,000) per occurrence.
Umbrella and excess liability policies may be used to satisfy the foregoing limits. The minimum limits specified above are the minimum amounts required by Landlord, and may be revised by Landlord from time to time (but not more than once during each
calendar year of the Term) to meet changed circumstances, including without limitation to reflect changes consistent with the standards required by other landlords of Comparable Buildings. Such liability insurance shall name Landlord and indemnified
parties described in Paragraph 8.4 below as additional insureds for incidents occurring on or about the Premises on a primary basis and not contributing to any insurance available to Landlord or indemnified parties, and Landlord’s and such
indemnified parties’ insurance (if any) shall be in excess thereto. Such insurance shall specifically insure Tenant’s performance of the indemnity, defense and hold harmless agreements contained in Paragraph 8.4, although
Tenant’s obligations pursuant to Paragraph 8.4 shall not be limited to the amount of any insurance required of or carried by Tenant under this Paragraph 8.2(b). Tenant shall be responsible for insuring that the amount of insurance
maintained by Tenant is sufficient for Tenant’s purposes. 

  
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 (c) Business Interruption Insurance. Business interruption insurance with limits of
liability representing at least twelve (12) months of income. 
 (d) Business Auto Liability Insurance. Business auto liability
covering owned, non-owned and hired vehicles with a limit of not less than $1,000,000 per accident. 

(e) Workers Compensation and Employer’s Liability Insurance. Insurance protecting against liability under worker’s
compensation laws with limits at least as required by applicable state statute, including Employers Liability with policy limits of $1,000,000 per occurrence by accident or disease. The policy shall contain waiver of subrogation rights against the
Landlord and any indemnified parties under this Lease. 
 (f) Other. Such other insurance that is either (i) required by any
lender holding a security interest in the Building, or (ii) reasonably required by Landlord and customarily carried by tenants of Comparable Building in similar businesses. 

(g) Form of Policies. The policies required to be maintained by Tenant pursuant to Paragraphs 8.2(a), (b), (c), (d), (e), and
(f) above shall be with companies having a Best Insurance Guide rating of A- VII or better and be on forms, with deductible amounts (if any), and loss payable clauses (as to the insurance referred to in
Paragraph 8.2(a) applicable to leasehold improvements installed by Tenant as Tenant’s sole cost) reasonably satisfactory to Landlord, shall include Landlord and the beneficiary or mortgagee of any deed of trust or mortgage encumbering the
Premises and/or the Land as additional insureds (with regard to the insurance described in Paragraphs 8.2 and loss payees (with regard to the insurance described in Paragraphs 8.2(a), (c) and (f), and shall provide that such parties may, although
additional insureds or loss payees, recover for any loss suffered by the negligence of Tenant or any Tenant Related Parties subject to Paragraph 8.6 of this Lease. Certificates of insurance for the policies to be required by Tenant to include
additional insured endorsements shall be delivered to Landlord prior to the Commencement Date; a new policy or certificate shall be delivered to Landlord prior to the expiration date of the old policy. Tenant shall have the right to provide
insurance coverage which it is obligated to carry pursuant to the terms hereof in a blanket policy, provided such blanket policy expressly affords coverage to the Premises and Common Area and to Tenant as required by this Lease. Tenant shall
endeavor in good faith to provide Landlord and any beneficiary or mortgagee of a deed of trust or mortgage encumbering the Premises and/or the Land in writing of any delinquency in premium payments and at least ten (10) days prior to any
cancellation or material modification of any policy. Tenant’s policies shall provide coverage on an occurrence basis and not on a claims made basis. In no event shall the limits of any policies maintained by Tenant be considered as limiting the
liability of Tenant under this Lease. 
 8.3 Failure by Tenant to Obtain Insurance. If Tenant does not take out the insurance required
pursuant to Paragraph 8.2 or keep the same in full force and effect, Landlord may, but shall not be obligated to, upon an additional five (5) days’ written notice to Tenant, take out the necessary insurance and pay the premium
therefor, and Tenant shall repay to Landlord, as Additional Rent, the amount so paid within thirty (30) days after Tenant’s receipt of invoices therefor. In addition, Landlord may recover from Tenant and Tenant agrees to pay, as Additional
Rent, any and all actual and reasonable expenses (including reasonable attorneys’ fees) and actual damages which Landlord may sustain by 

  
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reason of the failure of Tenant to obtain and maintain such insurance, it being expressly declared that the expenses and actual damages of Landlord shall not be limited to the amount of the
premiums thereon. In no event shall Landlord be able to recover from Tenant indirect, consequential, special, exemplary, incidental or punitive damages pursuant to this Paragraph 8.3. 

8.4 Indemnification. To the fullest extent permitted by law, but subject to the mutual waiver of subrogation set forth in Paragraph 8.6
below, Tenant shall indemnify, hold harmless, and defend Landlord (with competent counsel reasonably satisfactory to Landlord) against all third-party claims, liabilities, losses, damages, actions, causes of action, demands, judgments, penalties,
costs and expenses arising out of any occurrence in, on or about the Building, Common Area or Land, to the extent (i) caused or contributed to by Tenant or any Tenant Related Parties, or (ii) arising out of any occurrence in, upon or at
the Premises from and after the Delivery Date until the expiration of the Term or earlier termination of this Lease, but including any periods during which Tenant or any Tenant Related Parties are holding over, or (iii) on account of the use,
condition, or occupancy of the Premises from and after the Delivery Date until the expiration of the Term or earlier termination of this Lease, but including any periods during which Tenant or any Tenant Related Parties are holding over; provided,
however, such indemnification, defense and hold harmless obligation shall not be applicable to any claims, losses, damages, expenses or liabilities to the extent arising out of the gross negligence or willful misconduct of Landlord or that of its
agents, employees or contractors. Tenant’s indemnification, defense and hold harmless obligations under this Lease shall include and apply to reasonable attorneys’ fees, investigation costs, and other costs actually incurred by Landlord.
Tenant shall further indemnify, defend and hold harmless Landlord from and against any and all claims, losses, damages, liabilities or expenses to the extent arising from any breach or default in the performance of any obligation on Tenant’s
part to be performed under the terms of this Lease, except to the extent caused by the gross negligence or willful misconduct of Landlord, its agents, employees or contractors. The provisions of this Paragraph 8.4 shall survive Lease
Termination with respect to any damage, injury, liability, claim, death, breach or default occurring prior to such termination. Except to the extent resulting from the gross negligence or willful misconduct of Landlord, its agents, employees or
contractors, or breach of this Lease by Landlord (and then subject to Paragraph 8.6 below), and except as otherwise set forth in this Paragraph 8.4, this Lease is made on the express condition that Landlord shall not be liable for, or suffer
loss by reason of, injury to person or property, from whatever cause, in any way connected with the condition, use, or occupancy of the Premises from and after the Delivery Date until the expiration of the Term or earlier termination of this Lease,
but including any periods during which Tenant or any Tenant Related Parties are holding over, specifically including, without limitation, any liability for injury to the person or property of Tenant or any Tenant Related Parties. Anything in this
Paragraph 8.4 to the contrary notwithstanding, under no circumstances shall Landlord be liable to Tenant for any indirect, special, exemplary, incidental, punitive or consequential damages, including lost profits, loss of income or loss of business.

 8.5 Claims by Tenant. Landlord shall not be liable to Tenant for loss or damage to Tenant’s business (and Tenant waives all
claims against Landlord therefor), and Tenant also waives all claims against Landlord for personal or bodily injury or death to any person, damage to any property, or loss of use of any property in any portion of the Project by and from all causes,
including without limitation, any defect in any portion of the Project and/or any damage or injury resulting from fire, steam, electricity, gas, water or rain, which may leak or flow from or into any part of the Premises, or from breakage, leakage,
obstruction or other defects of pipes, sprinklers, wires, appliances, plumbing, air conditioning or lighting fixtures, whether the damage or injury results from conditions arising upon the Premises or upon other portions of the Project or from other
sources. Landlord shall not be liable for any damages arising from any act or negligence of any other tenant or user of the Project. Tenant shall promptly notify Landlord in writing of any known defect in the Project. Notwithstanding the foregoing,

  
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Tenant’s waiver of claims and release of Landlord as provided in this Paragraph 8.5 above shall not apply to any loss or damage or injury or death caused by Landlord’s willful
misconduct or gross negligence, or that of its agents, employees or contractors; however, under no circumstances shall Landlord be liable to Tenant for indirect, special, exemplary, incidental, punitive or consequential damages, including
lost profits, loss of income or loss of business. 
 8.6 Mutual Waiver of Subrogation. Notwithstanding anything to the contrary
contained in this Lease, Landlord hereby releases Tenant, and Tenant hereby releases Landlord, and their respective agents, employees, servants, managers, members, partners, shareholders and directors, from any and all claims or demands of damages,
loss, expense or injury to the Project, or to the furnishings, fixtures, equipment, inventory or other property of either Landlord or Tenant in, about or upon the Project, which is caused by or results from perils, events or happenings which are the
subject of property insurance required to be carried under this Lease or actually carried by the respective parties pursuant to this Paragraph 8 and in force at the time of any such loss, whether due to the negligence of the other party or its
agents and regardless of cause or origin except to the extent that such property is not covered by insurance. 
 8.7 No Consequential
Damages. Notwithstanding anything to the contrary contained in this Lease, except with respect to Tenant’s obligations pursuant to Paragraph 6.4 (“Hazardous Materials”), Paragraph 21 (“Holding Over”), and Paragraph 35
(“Surrender”) below, in no event shall either party be liable to the other for any indirect, consequential, special, exemplary, incidental or punitive damages arising from or relating to this Lease. Further, nothing contained in this
Paragraph 8.7 shall affect Landlord’s rights and remedies under Paragraph 14.2 below, including without limitation, the remedies afforded Landlord by Civil Code Section 1951.2(a)(4) and more specifically described in Paragraph 14.2.1(d).
Moreover, the foregoing prohibition on recovery of indirect, consequential, special, exemplary, incidental or punitive damages shall not be applicable to losses that are caused by vendors or contractors retained by Tenant. 

9. Utilities. Landlord (and Tenant with respect to the provisions set forth in Paragraph 9(f) below) shall be responsible to furnish
those utilities and services to the Premises to the extent provided in this Paragraph 9 below (“Services”), subject to the conditions and payment obligations and standards set forth in this Lease. The following standards for Services shall
be in effect at the Building from and after the Delivery Date until Lease Termination: 
 (a) HVAC Service. Landlord shall provide
reasonable HVAC services to the Premises during such hours and at such times as Tenant may require from time to time.  
 (b)
Electricity and Water. Landlord shall furnish electricity service to the Premises of not less than 6.0 watts per usable square foot, exclusive of HVAC (other than Tenant-installed supplemental air conditioning) and Base Building ceiling
lighting. Landlord shall furnish hot and cold water to the Premises for drinking, personal hygiene, lavatory and other purposes required for Tenant’s and its Licensee’s utilization of the Premises. Tenant will not, without the prior
written consent of Landlord (which consent shall not be unreasonably withheld, conditioned or delayed), connect any apparatus, machine or device with water pipes or electric current (except through existing electrical outlets in the Premises). 

(c) Elevators. Landlord shall furnish elevator service in the Building 24 hours per day, 7 days per week (unless any elevator(s) are
being temporarily repaired or investigated or are awaiting parts to operate properly, but in such event Landlord shall use commercially reasonable efforts to cause at least one passenger elevator to be running at all times). 

  
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 (d) Janitorial. Tenant shall provide its own janitorial service to the Premises, subject
to Landlord’s right to approve the janitorial service provider, which approval shall not be unreasonably withheld, conditioned or delayed. In no event shall Landlord pass through to Tenant as Operating Expenses janitorial costs for the
Premises. Landlord shall be permitted to include in Operating Expenses janitorial costs with respect to the Common Areas within the Building. 

(e) Access. During the Term of this Lease, as the same may be extended, Tenant and its employees shall have access to the Premises 24
hours per day, 7 days per week, 52 weeks per year, unless such access is prohibited, limited or restricted by any governmental or quasi-governmental law, statute, ordinance, rule or regulation, damage to or destruction or condemnation of the
Premises, Building or other portion of the Project or due to an emergency. Such access to the Premises also shall be subject to such security or monitoring systems as Landlord may reasonably impose, including
sign-in procedures and/or presentation of identification cards. Landlord may install access control systems as it deems advisable for the Building. Landlord may impose a reasonable charge for access control
cards and/or keys issued to Tenant after the issuance of the access control cards for Tenant’s initial occupancy for purposes of conducting business. If Landlord provides access control services, then, except to the extent caused by the gross
negligence or willful misconduct of Landlord, its agents or employees, Landlord shall have no liability to Tenant for the provision by Landlord of improper access control services or for any breakdown in service. In addition, Landlord shall have no
liability to Tenant for the failure by Landlord to provide access control services. Tenant acknowledges that Landlord’s access systems may be temporarily inoperative during building emergency and system repair periods. Tenant agrees to assume
responsibility for compliance by its employees and invitees with any regulations reasonably established by Landlord with respect to any card key access or any other system of building access as Landlord may reasonably establish. 

(f) Utility and Other Services. Tenant shall be responsible for and shall pay, or cause to be paid, promptly, directly to the
appropriate supplier, all charges for telephone and telecommunications service, and all other materials and services furnished to Tenant or the Premises or used by Tenant or any Tenant Related Parties in, on or about the Premises during the Term,
together with any taxes thereon. Notwithstanding the foregoing, electricity consumption or usage within the Premises shall be separately metered or submetered to the Premises, and Landlord shall bill Tenant monthly during the Term of this Lease, as
the same may be extended, for such actual electrical consumption or usage within the Premises based on Landlord’s reading of the meter or submeter measuring such consumption or usage. Tenant shall pay such electrical charges billed by Landlord
to Tenant within thirty (30) day following Tenant’s receipt of an invoice(s) from Landlord for such electricity consumption or usage. In the event that any such utilities or services cannot be separately billed or metered to the Premises,
or if any of the utilities or services are not separately metered or submetered as of the Commencement Date, the cost of such utilities or services, as the case may be, shall be an Operating Expense and Tenant shall pay, as Additional Rent,
Tenant’s proportionate share of such cost to Landlord as provided in Paragraph 12 below, except that if any meter services less than the entire Building, Tenant’s proportionate share of the costs measured by such meter shall be based
upon the square footage of the gross leasable area in the Premises as a percentage of the total square footage of the gross leasable area of the portion of the Building serviced by such meter (excluding, however, the cost of any disproportionate use
by others within that portion of the Building). If Landlord reasonably determines that Tenant or any the Tenant Related Parties is using a disproportionate amount of any commonly metered utilities or an amount in excess of the customary amount of
any utilities ordinarily furnished for use of the Premises, or applicable part thereof, in accordance with the uses set forth in Paragraph 6 above, then Landlord may elect to periodically charge Tenant, as Additional Rent, a sum equal to
Landlord’s good faith estimate of the cost of Tenant’s or any of Tenant Related Parties’ excess use of any or all such utilities. 

  
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 The lack or shortage of any Services due to any cause whatsoever (except for a lack or shortage
proximately caused by the negligence or willful misconduct Landlord or that of its agents, employees or contractors) shall not affect any obligation of Tenant hereunder, and Tenant shall faithfully keep and observe all the terms, conditions and
covenants of this Lease and pay all Rentals due hereunder, all without diminution, credit or deduction. Landlord’s temporary inability to furnish any services or utilities shall not entitle Tenant to any damages, relieve Tenant of the
obligation to pay any Rentals or constitute a constructive or other eviction of Tenant, except that Landlord shall diligently attempt to restore the service or utility promptly. Tenant acknowledges and agrees that in no event shall Landlord
be liable to Tenant for any consequential damages, such as lost profits, loss of business or lost income, if there is any lack or shortage of any Services or utilities to the Premises. Notwithstanding anything to the contrary contained herein, if
all or any portion of the Premises should become untenantable as a consequence of a cessation of utilities or services arising out of the negligence or willful misconduct of Landlord, its agents, employees or contractors for a period exceeding five
(5) consecutive business days, then, Tenant shall give Landlord prompt written notice thereof and commencing on the sixth (6th) business day and continuing until the utility or service has been restored, Tenant shall be entitled to a
proportionate abatement of all Rentals payable hereunder to the extent of the interference with Tenant’s use of the Premises occasioned thereby. The preceding to the contrary notwithstanding, in no event shall such proportionate abatement
commence earlier than the date that is two (2) business days prior to the date Landlord receives Tenant’s written notice of such cessation or utilities or services. 

Tenant shall comply with all rules and regulations which Landlord may reasonably establish for the provision of services and utilities, and
shall cooperate with all reasonable conservation practices established by Landlord. Landlord shall at all reasonable times have free access to all electrical and mechanical installations of Landlord; provided, however, that if Landlord needs access
to the Premises in order to access an electrical or mechanical installation during normal business hours, Landlord shall provide Tenant with at least twenty-four (24) hours’ prior written notice of Landlord’s entry. In the event of an
emergency, prior to entry or as soon thereafter as is practicable under the circumstances, Landlord shall notify Mike Hawkins, mike.hawkins@bloomenergy.com, who may accompany Landlord’s entry onto the Premises in such event. 

Landlord hereby discloses to Tenant that fiber and cable television service is available in the Building from a third party cable provider(s).

 10. Repairs and Maintenance. 

10.1 Landlord’s Responsibilities. Subject to the provisions of Paragraph 15 below, Landlord shall maintain in
good order and repair, commensurate with the maintenance provided by reasonably prudent owners of Comparable Buildings, the Building Structure. In addition, Landlord shall maintain, or cause to be maintained, in good order and repair, commensurate
with the maintenance provided by reasonably prudent owners of Comparable Buildings, the Building Systems (with respect to the plumbing and electrical systems, to the point where the Building plumbing system ties into any plumbing located in the
Premises and to the point of connection with the circuit breakers for the Premises), except to the extent provided below. Landlord need not make any other improvements or repairs except as specifically required under this Lease, and nothing
contained in this Paragraph 10.1 

  
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shall limit Landlord’s right to reimbursement from Tenant for maintenance, repair costs and replacement costs as provided elsewhere in this Lease. Notwithstanding any provision of the
California Civil Code or any similar or successor laws to the contrary, Tenant understands that it shall not make repairs at Landlord’s expense or by rental offset except to the extent expressly provided in Paragraph 10.2 below. Tenant shall
give prompt written notice to Landlord of any known maintenance work required to be made by Landlord pursuant to this Paragraph 10.1. The costs incurred by Landlord pursuant to the provisions of this Paragraph 10.1 (excepting therefrom the
costs of all necessary and customary capital repairs and capital replacements of the Building Structure, which shall be the sole obligation of Landlord to perform and pay for without right of reimbursement from Tenant except to the extent that such
capital repairs or replacements are required due to damage (other than ordinary wear and tear) caused by the acts, omissions, negligence or willful misconduct or misuse of the Premises or Building, or applicable portion thereof, by Tenant or any
Tenant Related Parties, in which event, subject to Paragraph 8.6 above, Tenant shall be obligated to pay or reimburse Landlord for 100% of the cost of such repair or replacement (unless Landlord can pass-through such cost as an Operating Expense to
all other tenants in the Building on a percentage share basis, in which event Tenant shall pay or reimburse Landlord for Tenant’s percentage share of the cost of such repair or replacement within thirty (30) days after receipt by Tenant of
Landlord’s invoice therefore accompanied by reasonable supporting documentation) with respect to the Building shall be an Operating Expense and with respect to the Exterior Common Areas shall be an Exterior Common Area Operating Expenses (in
both cases, subject to any applicable limitations or exclusions set forth elsewhere in this Lease) and Tenant shall pay, as Additional Rent, Tenant’s share of such costs to Landlord as provided in Paragraph 12 below and the preventive
maintenance costs incurred by Landlord with respect to the rooftop HVAC units serving the Building shall be included in Operating Expenses and provided, further, if repair or replacement of the Building Structure or Building Systems referred to
above is caused by (i) Tenant’s breach of any of Tenant’s obligations under this Lease, or (ii) any misuse of the Premises or Building by, or negligence or willful misconduct of, Tenant or any Tenant Related Parties, then Tenant
shall reimburse or pay to Landlord, within thirty (30) days after receipt of a statement or invoice and reasonable back up documentation of such costs, for one hundred percent (100%) of the costs paid or incurred by Landlord to repair or
replace the same less any insurance proceeds received by Landlord allocable to the Building Structure or Building Systems. The foregoing to the contrary notwithstanding, costs incurred by Landlord for maintenance and/or repairs to the dedicated HVAC
units serving the Premises will be billed back to Tenant based on actual maintenance and repair costs incurred by Landlord, and Tenant shall reimburse Landlord or pay to Landlord such costs within thirty (30) days following Tenant’s
receipt of a statement or invoice and reasonable back-up documentation evidencing such costs. 
 10.2
Tenant’s Self-Help Remedy. If Landlord is in material default of any of its obligations to maintain and repair the Building Systems or the Building Structure (other than as a result of a casualty, which shall be governed solely by the
provisions of Article 15 of this Lease) (collectively referred to in this Paragraph 10.2 as “repairs”), and such default poses a material and imminent risk to the health or safety of persons or material interruption of
Tenant’s business operations, then, notwithstanding anything to the contrary contained in this Lease, Tenant may perform such repairs subject to the following terms and conditions: 

10.2.1 Tenant shall deliver thirty (30) days written notice to Landlord and any ground lessor or lender whose name and address has
previously been furnished to Tenant in writing for such purpose notice (the “Self-Help Notice”) of Tenant’s intention to perform such repairs, which Self-Help Notice shall indicate Tenant’s intention to exercise its self-help
rights and to perform such repairs that are otherwise Landlord’s responsibility hereunder. If neither Landlord nor any ground lessor or lender commences to cure Landlord’s failure to perform such repairs within thirty (30) days after
receipt 

  
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of the Self-Help Notice, then following an additional ten (10) business days’ notice stating in bold-faced all capital letters: “FAILURE TO PERFORM SUCH WORK IN TEN
(10) BUSINESS DAYS SHALL RESULT IN TENANT’S EXERCISE OF SELF-HELP” and the failure of such maintenance or repairs to be commenced in such time, Tenant may take such action as is reasonably necessary to perform such repairs; 

10.2.2 All repairs performed by Tenant or its agents pursuant to this Paragraph 10.2 must be performed in a good and workmanlike and lien-free
manner in compliance with applicable Laws and covenants, conditions and restrictions, if any, recorded against the Project, or applicable part thereof, at a reasonable and competitive cost and rate, and shall not void any warranties or guarantees on
the Premises or the Project of which Tenant has notice; 
 10.2.3 In the event Landlord’s failure relates to repairs that are bona fide
emergency repairs (i.e., necessary to prevent or remediate a material and imminent threat to the health or safety of persons or material interruption of Tenant’s business operations), then, notwithstanding the provisions of Paragraph 10.2.1
above, the Self-Help Notice shall be in the form and shall be given in such amount of time as is reasonable in the circumstances, and if Landlord, ground lessor or lender fails to respond within a time as is reasonable in the circumstances, Tenant
may cause such emergency repairs to be made pursuant to the requirements set forth herein (and for the avoidance of doubt, specifically excluding the additional ten (10) business day notice period above so long as the initial notice provides in
bold-faced, all capital letters that: “FAILURE TO ACT SHALL RESULT IN TENANT EXERCISING SELF-HELP”); and 
 10.2.4 Except as
otherwise provided in this Paragraph 10.2.4 below, Landlord shall reimburse Tenant for the reasonable out of pocket third-party costs of the performance of the repairs that are incurred in strict accordance with the terms of this Paragraph 10.2 (the
“Reimbursement Amount”) within thirty (30) days after Tenant’s submission to Landlord of Tenant’s bill therefor, which bill shall be accompanied by receipted, itemized invoices (with reasonable supporting documentation) and
conditional lien releases from all contractors, subcontractors, materialmen and suppliers that performed the work or provided the material or services reflected in the bill), provided, however, in no event shall the costs billed to Landlord for
emergency repairs be unreasonable and in no event shall such emergency repairs exceed what is required to end the pending emergency (it being understood and agreed by Landlord that in the case of an emergency, depending upon the circumstances,
overtime and/or premium time labor charges may be reasonable). Tenant shall provide unconditional lien waivers to Landlord in connection with all such bills paid within ten (10) days of Landlord’s payment of Tenant’s bill, or as soon
thereafter as reasonably practicable. In the event Landlord fails to pay all or any portion of the Reimbursement Amount due Tenant under this Paragraph 10.2 within thirty (30) days after receipt of Tenant’s bill therefore, together with
the invoices therefor, supporting documentation and the conditional lien releases required by this Paragraph 10.2.4, Tenant may with ten (10) business days’ prior notice to Landlord stating in bold-faced, all capital letters that:
“FAILURE TO REIMBURSE WITHIN TEN (10) BUSINESS DAYS SHALL RESULT IN TENANT’S EXERCISE OF OFFSET RIGHTS”, offset such delinquent amount against fifty percent (50%) of the Base Rent due from Tenant until Tenant has been reimbursed
in full (together with interest on such delinquent amount at the rate of eight percent (8%) per annum until such delinquent amount has been paid in full or fully credited), provided that Tenant shall provide Landlord with unconditional lien waivers
in connection with the work relating to such amounts within ten (10) days of the date on which the amount has been fully paid or so offset, or as soon thereafter as reasonably practicable. Notwithstanding the foregoing, if Landlord delivers to
Tenant a good faith written objection notice within five (5) business days after receipt of Tenant’s notice of intent to offset, setting forth with reasonable particularity Landlord’s reasons for its claim that Landlord

  
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is not required to pay Tenant all or any specified portion of the Reimbursement Amount, then Tenant shall not be entitled to offset the disputed portion of the Reimbursement Amount. In the event
of a dispute between Landlord and Tenant regarding the Reimbursement Amount, the dispute shall be determined by binding arbitration before JAMS in San Jose, California. The arbitration shall be administered and conducted pursuant to the JAMS
Streamlined Arbitration Rules & Procedures (the “Arbitration Rules”). Unless the parties otherwise agree, the arbitrator must be a retired judge of the Superior Court of the State of California. The preceding to the contrary
notwithstanding, if Tenant exercises its self-help right pursuant to this Paragraph 10.2, then Landlord shall not be obligated to pay to or reimburse Tenant for any portion of the costs incurred by Tenant in exercising its self-help right that are
the responsibility of Tenant under the Lease. As an illustrative example of the foregoing, if Tenant timely and properly exercises its self-help right with respect to maintaining or repairing any dedicated HVAC units serving the Premises, then
because Tenant is responsible under this Lease for the payment of 100% of such maintenance and repair costs with respect to such dedicated HVAC units, Landlord shall not be obligated to pay or reimburse Tenant for any portion of the maintenance and
repair costs incurred by Tenant with respect to the dedicated HVAC units. 
 10.3 Tenant’s Responsibilities. Except
as expressly provided in Paragraph 10.1 above, and subject to the provisions of Paragraphs 15 and 16 hereof and excluding any repairs to the Building Structure (unless such structural repairs are required to repair any damage caused by the
negligence or willful misconduct of Tenant or any Tenant Related Party or any breach of Tenant’s obligations under this Lease, in which event Tenant shall perform such repairs at Tenant’s sole cost and expense or, at Landlord’s
election, Landlord shall undertake such structural repairs and Tenant shall reimburse Landlord for the actual and reasonably structural repair costs incurred or paid by Landlord within thirty (30) days following receipt of an invoice and
reasonable back-up documentation evidencing such structural repair costs incurred or paid by Landlord), Tenant shall, at its sole cost, maintain the Premises and every part thereof, including without
limitation, interior windows, door frames, appliances, interior glass (if any), doors, door closures and related hardware, interior walls and partitions, fixtures, electrical, plumbing, fire extinguisher equipment and other equipment installed in
the Premises that exclusively serves the Premises and all Alterations constructed by or on behalf of Tenant pursuant to Paragraph 13 below, together with any supplemental HVAC equipment installed by or on behalf of Tenant serving only the Premises,
or applicable part thereof, in good order, condition and repair. All repairs and other work performed by Tenant or its contractors shall be subject to the terms of Paragraphs 13 and 17 below. Alternatively, should Landlord or its management agent
agree to make a repair on behalf of Tenant and at Tenant’s request, Tenant shall promptly reimburse Landlord as Additional Rent for all reasonable costs incurred (but in no event may Landlord charge a market supervision fee) upon submission of
an invoice. 
 If Tenant fails to make repairs or perform maintenance work required of Tenant hereunder within fourteen (14) days after
written notice from Landlord specifying the need for such repairs or maintenance work, Landlord or Landlord’s agents or designated contractors may, in addition to all other rights and remedies available hereunder or by law and without waiving
any alternative remedies, enter into the Premises and make such repairs and/or perform such maintenance work. If Landlord makes such repairs and/or performs such maintenance work, Tenant shall reimburse Landlord within thirty (30) days after
receipt of an invoice and reasonable back-up documentation with respect thereto and as Additional Rent, for the actual and reasonable cost of such repairs and/or maintenance work. Landlord shall use reasonable
efforts to avoid causing any inconvenience to Tenant or interference with the use of the Premises by Tenant or Tenant Related Parties during the performance of any such repairs or maintenance. Landlord shall have no liability to Tenant for any
damage, inconvenience or interference with the use of the Premises by Tenant or any Tenant Related Parties as a result of Landlord performing 

  
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any such repairs or maintenance (except to the extent arising out of the gross negligence or willful misconduct of Landlord or that of its agents, employees or contractors; provided, however,
under no circumstances shall Landlord be liable to Tenant for indirect, special, exemplary, incidental, punitive or consequential damages, including, without limitation, lost profits, loss of business or lost income), nor shall any related activity
by Landlord constitute an actual or constructive eviction unless Tenant is denied all beneficial use of the Premises for twelve (12) consecutive months or more; provided, however, in making repairs, alterations or improvements, Landlord shall
take reasonable steps, to the extent practicable under the circumstances, to minimize interference with the conduct of Tenant’s business in the Premises. Tenant shall reimburse Landlord, on demand and as Additional Rent, for the cost of damage
to the Project caused by Tenant or any Tenant Related Parties. Tenant hereby waives and releases its right to make repairs at Landlord’s expense pursuant to Sections 1941 and 1942 of the Civil Code of California or under any similar law,
statute or ordinance now or hereafter in effect. With respect to any damage which Landlord is obligated to repair or elects to repair, Tenant, as a material inducement to Landlord entering into this Lease, irrevocably waives and releases its rights
under the provisions of Sections 1932(2) and 1933(4) of the California Civil Code. Tenant furthermore waives the benefits of subsection 1 of Section 1932 of the California Civil Code or under any similar law. 

11. Common Area. 
 11.1
In General. Subject to the terms and conditions of this Lease and the Rules and Regulations referred to in Paragraph 44 below, Tenant and its agents, employees, licensees and invitees shall have, in common with other tenants of the Building
and other buildings located on the Land and other permitted users, the nonexclusive right to use during the Lease Term the access roads, parking areas, sidewalks, landscaped areas and other facilities on the Land or in the Building designated by
Landlord for the general use and convenience of the occupants of the Building and other authorized users, which areas and facilities are referred to herein as the “Common Area.” This right to use the Common Area shall terminate upon Lease
Termination. Anything herein to the contrary notwithstanding, Tenant and its agents, employees, customers, licensees, invitees, sublessees and other representatives shall have no right to use that portion of the area situated outside of the Building
that is shown cross-hatched on Exhibit G attached hereto (“Restricted Common Area”). 
 Landlord shall at all times have
exclusive control of the Common Area. Landlord shall have the right, without the same constituting an actual or constructive eviction and without entitling Tenant to any abatement of rent, to: (i) close any part of the Common Area to whatever
extent required in the reasonable opinion of Landlord’s counsel to prevent a dedication thereof or the accrual of any prescriptive rights therein; (ii) temporarily close the Common Area to perform maintenance or for any other reason
reasonably deemed sufficient by Landlord; (iii) change the shape, size, location and extent of the Common Area; (iv) eliminate from or add to the Project any land or improvement, including multi-deck parking structures; (v) make
changes to the Common Area including, without limitation, changes in the location of driveways, entrances passageways, doors and doorways, elevators, stairs, restrooms, exits, parking spaces, parking areas, sidewalks or the direction of the flow of
traffic and the site of the Common Area; (vi) remove unauthorized persons from the Project; and/or (vii) change the name or address of the Building or Project. Tenant shall keep the Common Area clear of all obstructions created or
permitted by Tenant and/or Tenant Related Parties. If in the reasonable opinion of Landlord unauthorized persons are using any of the Common Area by reason of the presence of Tenant (or any Tenant Related Parties) in the Building, Tenant, upon
demand of Landlord, shall use commercially reasonable good faith efforts to restrain such unauthorized use. In exercising any such rights regarding the Common Area, Landlord shall make a reasonable effort to minimize, to the extent practicable under
the circumstances, any disruption to Tenant’s business. Landlord shall have no obligation to provide guard services or other security measures for the benefit of the Project. Tenant assumes all responsibility for the protection of Tenant and
Tenant Related Parties from acts of third parties; provided, however, that nothing contained herein shall prevent Landlord, at its sole option, from providing security measures for the Project. 

  
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 11.2 Parking Areas. During the Term of this Lease, as the same may be extended, Tenant is
allocated and Tenant and Tenant’s employees and invitees shall have the right to use, on an unreserved basis, without payment of a separate fee therefor, not more than the number of parking spaces set forth in Paragraph 1.15, the location
of which shall be in the surface parking area within the Exterior Common Area designated from time to time by Landlord. Such number of parking spaces set forth in Paragraph 1.15 of this Lease shall be available to Tenant and its employees and
invitees from and after the Delivery Date and throughout the Term, as the same may be extended, subject to the terms below, 24 hours per day, 7 days a week, 365 days per year, unless such availability is prohibited, limited or restricted pursuant to
the terms below or by any governmental or quasi-governmental law, statute, ordinance, rule or regulation, damage to or destruction or condemnation of the Premises, Building, Exterior Common Area, or Project, or applicable portion thereof, Premises,
Building or other portion of the Project or due to an emergency or for restriping, resurfacing or other repairs or maintenance or to prevent a prescriptive easement from arising with respect to any portion of the parking areas of the Project.
Neither Tenant nor any Tenant Related Parties shall at any time use more parking spaces than the number so allocated to Tenant or park or permit the parking of their vehicles in any portion of the Land not designated by Landlord as a nonexclusive
parking area. Tenant and Tenant Related Parties shall not have the exclusive right to use any specific parking space; however, Landlord shall mark five (5) parking spaces in front of the Building in the location closest to the Building entrance
nearest to the Premises) for “Bloom Visitors”. Landlord shall have no obligation to ensure that only invitees of Tenant park in such five (5) parking spaces referred to in the immediately preceding sentence. Landlord reserves
the right, after having given Tenant reasonable notice, to have any vehicles owned by Tenant or any Tenant Related Parties which are parked in violation of the provisions of this Paragraph 11.2 or in violation of Landlord’s Rules and
Regulations relating to parking referred to in Paragraph 44, to be towed away at the cost of the owner of the towed vehicle. In the event Landlord elects or is required by any law to limit or control parking on the Land, by validation of parking
tickets or any other method, Tenant agrees to participate in such validation or other program under the Rules and Regulations reasonably established by Landlord and referred to in Paragraph 44 below. Provided that Tenant’s use, occupancy and
enjoyment of the Premises or access to the Premises is not unreasonably interfered with, Landlord shall have the right to close, at reasonable times, all or any portion of the parking areas for any reasonable purpose, including without limitation,
the prevention of a dedication thereof, or the accrual of rights of any person or public therein. Tenant and Tenant Related Parties shall not at any time park or permit the parking of (i) trucks or other vehicles (whether owned by Tenant or
other persons) adjacent to any loading areas so as to unreasonably interfere with the use of such areas, (ii) Tenant’s or Tenant Related Parties’ vehicles or trucks, or the vehicles or trucks of Tenant’s suppliers or others, in
any portion of the Common Area not designated by Landlord for such use by Tenant or its employees, Licensees and invitees, or (iii) any inoperative vehicles or equipment on any portion of the Common Area for more than twenty-four
(24) hours. 
 11.3 Fitness Center. During the Term, Tenant and the employees of Tenant located at the Premises shall have the
right to use the fitness center located within the Common Area of the Building and designated by Landlord for the common use of all tenants of the Building (and the tenants of the Parcel B Building). Tenant and its employees’ right to use such
fitness center shall be on a non-exclusive and as available basis with others who are entitled to use the fitness center, subject to Landlord’s right to reasonably regulate, manage and restrict such use.
Prior to Tenant or its employees using the fitness center, Tenant shall cause such applicable employee desiring to use the fitness center to 

  
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execute an Informed Consent Waiver and Release of Liability in a form prepared by Landlord. Landlord shall be entitled to prohibit any employee(s) of Tenant from using the fitness center if such
applicable employee(s) fails or refuses to execute such Informed Consent Waiver and Release of Liability. The use of the fitness center shall be subject to reasonable rules and regulations (including rules regarding hours of use for the tenants and
their respective employees and other occupants of the Building, execution of Landlord’s standard waiver of liability form by users, etc.) reasonably established from time to time by Landlord for such facilities. Landlord shall have no liability
whatsoever with respect to the existence, condition or availability of such fitness center, and Tenant hereby waives all claims against Landlord with respect to same. The costs of operating, maintaining, cleaning and repairing the fitness center
(including, without limitation, the cost of any third party operator hired or retained to manage or operate the fitness center) may be included as part of Operating Expenses. Tenant shall be responsible for all damage to the fitness center and its
equipment, fixtures and furnishings resulting from Tenant’s or any of its employees’ use of the fitness center. The fitness center located in the Building is a part of the Common Area of the Project (however, so long as tenants leasing
space in the Parcel B Building to be developed on the Land have a right to use the fitness center, only fifty percent (50%) of the footprint of the fitness center shall be considered Common Area for purposes of determining the rentable square
footage of the Building). Landlord may not contract or discontinue the providing of the fitness center as a Building amenity during the first five (5) years of the Term. If Landlord elects to discontinue the providing of the fitness center from
and after the end of the first five (5) years of the Term, Landlord shall so notify Tenant at least one hundred eighty (180) days prior to the date of discontinuance and Tenant, at Tenant’s sole discretion exercisable by written
notice to Landlord not later than ninety (90) days after the date of Landlord’s notice, shall elect to take over the operation of the fitness center. If Tenant elects to take over the operation of the fitness center pursuant to the terms
of the immediately preceding sentence, then (i) Tenant shall continue to operate the fitness center in substantially the same manner as Landlord operated the fitness center prior to turning over operation of the same to Tenant, (ii) Tenant
shall continue to make the fitness center accessible to all tenants of the Building and the tenants of the Parcel B Building and their respective employees and (iii) Tenant shall indemnify, defend and hold Landlord harmless from and against any
and all damages, losses, liabilities, claims, actions, causes of action, demands, judgments, costs and expenses (including, without limitation, reasonable attorneys’ fees and costs of suit) arising from or related to the operation, use and/or
management of the fitness center. Such obligations under clause (ii) immediately above shall survive the expiration or earlier termination of this Lease. During such period as Landlord is the operator of the fitness center, Landlord
shall have the right, at Landlord’s discretion, to expand or modify (without reducing the size of) the fitness center. 
 11.4
Maintenance by Landlord. Landlord shall maintain the Common Area in good order, condition and repair commensurate with the maintenance provided by reasonably prudent owners of Comparable Buildings, and shall manage the Common Area in
accordance with Landlord’s reasonable and customary standards. The expenditures for such maintenance shall be at the reasonable discretion of Landlord. The cost of such maintenance, operation and management with respect to any Common Area in
the Building shall be included in Operating Expenses, and with respect to the Exterior Common Areas shall be an Exterior Common Area Operating Expense (in both cases, subject to any applicable limitations or exclusions set forth elsewhere in this
Lease), and Tenant shall pay to Landlord, as Additional Rent, Tenant’s share of such costs as provided in Paragraph 12 below. 

  
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 12. Operating Expenses. 

12.1 Definition. “Operating Expense” or “Operating Expenses” as used in this Lease shall mean and include all items
identified in other paragraphs of this Lease as an Operating Expense and the total cost paid or incurred by Landlord for the operation, maintenance, repair, replacement, security and management of the Building which costs shall include, without
limitation: the cost of services and utilities supplied to the Building (to the extent the same are not separately charged or metered to tenants of the Building or the Premises); water; sewage; trash removal; fuel; electricity; heat; lighting
systems; fire protection systems; storm drainage and sanitary sewer systems; periodic inspection and regular servicing of the heating, ventilation and air conditioning system; periodic inspection and regular servicing of the Building Systems;
maintaining, repairing and replacing the roof membrane; property and liability insurance covering the Building and any other insurance carried by Landlord pursuant to Paragraph 8 above with respect to the Building; deductibles under such
insurance policies maintained by Landlord; window cleaning; cleaning, maintaining and repairing the Common Area in the Building; cleaning and repairing of stairways; costs related to irrigation systems and Building signs; fees for licenses and
permits required for the operation of the Building; the cost of complying with Laws, including, without limitation, non-capital maintenance, alterations and repairs required in connection therewith; costs
related to landscape maintenance; the cost of contesting the validity or applicability of any governmental enactments which may affect Operating Expenses; all additional costs and expenses incurred by Landlord with respect to the operation,
protection, maintenance, repair and replacement of the Building which would be considered a current expense (and not a capital expenditure) pursuant to generally accepted real estate accounting principles, consistently applied; and amortization of
costs of the following capital improvements to the Building (“Permitted Capital Costs”): (x) capital improvements (excluding therefrom Building Structure capital improvements, the cost of which shall remain the sole obligation of Landlord
to pay without right of reimbursement from Tenant except to the extent such capital repairs or replacements with respect to the Building Structure are required due to damage (other than ordinary wear and tear) caused by the acts, omissions,
negligence or willful misconduct or misuse of the Premises or Building, or applicable portion thereof, by Tenant or any Tenant Related Parties, in which event, subject to Paragraph 8.6 above, Tenant shall be obligated to pay or reimburse Landlord
for 100% of the cost of such Building Structure capital improvements (unless Landlord can pass-through such cost as an Operating Expense to all other tenants in the Building on a percentage share basis, in which event Tenant shall pay or reimburse
Landlord for Tenant’s percentage share of the cost of such Building Structure capital improvements within thirty (30) days after receipt by Tenant of Landlord’s invoice therefore accompanied by reasonable supporting documentation))
with respect to the Building shall be an Operating Expense and with respect to the Exterior Common Areas shall be an Exterior Common Area Operating Expenses (in both cases, subject to any applicable limitations or exclusions set forth elsewhere in
this Lease) Tenant’s share of the cost of such repair or replacement within thirty (30) days after receipt of Tenant’s invoice therefore accompanied by reasonable supporting documentation) required to be constructed in order to comply
with any Law (excluding Hazardous Materials Laws) not in effect or applicable to the Building as of the date of this Lease, (y) modification of existing or construction of additional capital improvements or building service equipment for the
purpose of reducing the consumption of utility services or Operating Expenses of the Building, or (z) replacement of capital improvements (excluding Building Structure capital improvements, the cost of which shall remain the sole obligation of
Landlord to pay without right of reimbursement from Tenant except to the extent such capital repairs or replacements are required due to damage (other than ordinary wear and tear) caused by the acts, omissions, negligence or willful misconduct or
misuse of the Premises or Building, or applicable portion thereof, by Tenant or any Tenant Related Parties, in which event, subject to Paragraph 8.6 below, Tenant shall be obligated to pay or reimburse Landlord for 100% of the cost of such Building
Structure capital improvements (unless Landlord can pass-through such cost as an Operating Expense to all other tenants in the Building on a percentage share basis, in which event Tenant shall pay or reimburse Landlord for Tenant’s percentage
share of the cost of such Building Structure capital improvements within thirty (30) days after receipt by Tenant of Landlord’s invoice therefore accompanied by reasonable supporting documentation)) or building service equipment existing
as of the date of the Date of this Lease when required because of normal wear and tear. The cost of (i) capital 

  
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repair items or Permitted Capital Costs, (excluding therefrom capital repairs and capital replacements of the Building Structure, including, the foundations, roof and exterior walls, the cost of
which shall remain the sole obligation of Landlord to pay without right of reimbursement from Tenant except to the extent such capital repairs or replacements are required due to damage (other than ordinary wear and tear) caused by the acts,
omissions, negligence or willful misconduct or misuse of the Premises or Building, or applicable portion thereof, by Tenant or any Tenant Related Parties, in which event, subject to Paragraph 8.6 above, Tenant shall be obligated to pay or reimburse
Landlord for 100% of the cost of such Building Structure capital improvements (unless Landlord can pass-through such cost as an Operating Expense to all other tenants in the Building on a percentage share basis, in which event Tenant shall pay or
reimburse Landlord for Tenant’s percentage share of the cost of such Building Structure capital improvements within thirty (30) days after receipt by Tenant of Landlord’s invoice therefore accompanied by reasonable supporting
documentation)), (ii) replacement of the roof membrane, and (iii) repainting the exterior of the Building, shall be amortized at the lesser of (x) the annual rate of interest charged on the loan obtained by Landlord to finance
such improvement (or if Landlord does not obtain a loan to finance such improvement, then at two (2) percent above the prime rate or reference rate published in the Wall Street Journal (or if such rate is not published in the Wall Street
Journal, then the prime rate or reference rate established by a national bank selected by Landlord), or (y) the maximum rate permitted by law, over the useful life of the repair or item as reasonably determined by Landlord in accordance with
generally accepted real estate accounting principles, consistently applied, and such amortization shall be included in Operating Expenses from the date of installation or repair through the earlier of the expiration of the useful life of the capital
item and the Lease Termination; provided, however, subject to Paragraph 8.6, if the HVAC system or any other building systems serving the Building or Premises, exterior windows or roof membrane need to be repaired or replaced due to
(A) Tenant’s breach of any of Tenant’s obligations under this Lease or (B) any misuse of the HVAC or other building systems, exterior windows or roof membrane by, or negligence or willful misconduct of, Tenant or any Tenant
Related Parties, then Tenant shall reimburse or pay to Landlord, within thirty (30) days following receipt of a statement or invoice and reasonable back up documentation of such costs, for one hundred percent (100%) of the costs paid or
incurred by Landlord to replace such HVAC or other building system, parking areas, exterior windows or roof membrane, as the case may be. Operating Expenses for any given period may also include (A) management fees payable to a property manager
(or if Landlord elects to self-manage the Building or Project, then payable to Landlord) in an amount equal to three percent (3%) of the monthly Base Rent received by Landlord from tenants of the Building, including, Tenant, during such
period and (B) the Building’s percentage share of Exterior Common Area Operating Expenses for such period. To the extent any Operating Expenses are incurred by Landlord with respect to both the Building and the Parcel B Building under or
pursuant to a single contract to which Landlord is a party and apply substantially equally to both the Building and the Parcel B Building (e.g. a single janitorial service contract where the janitorial services provided to the Building and the
Parcel B Building are the same), then, to the extent such Operating Expenses are not separately accounted for between the Building and the Parcel B Building, the Building shall be allocated 49.12% of such Operating Expenses. 

“Exterior Common Area Operating Expense” or “Exterior Common Area Operating Expenses” as used in this Lease shall mean and
include all items identified in other paragraphs of this Lease as an Exterior Common Area Operating Expense and the total cost paid or incurred by (or charged to) Landlord for the operation, maintenance, repair, replacement, security and management
of the Exterior Common Area which costs shall include, without limitation: the cost of services and utilities supplied to the Exterior Common Area; storm drainage; trash removal services with respect to such Exterior Common Area; electrical lighting
for the Exterior Common Area; water for landscaping included within the Exterior Common Area; property and liability insurance covering the Exterior Common Area and any 

  
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other insurance carried by Landlord pursuant to Paragraph 8 above with respect to the Exterior Common Area; deductibles under such insurance policies maintained by Landlord; cleaning,
sweeping, striping, sealing and/or resurfacing of parking and driveway areas; cleaning, maintenance and repair of the Exterior Common Area; cleaning and repairing of sidewalks and curbs; costs related to irrigation systems and Exterior Common Area
signs; fees for licenses and permits required for the operation of the Exterior Common Area; the cost of complying with Laws, including, without limitation, maintenance, alterations and repairs required in connection therewith; costs related to
landscape maintenance; the cost of contesting the validity or applicability of any governmental enactments which may affect Exterior Common Area Operating Expenses; all additional costs and expenses incurred by Landlord with respect to the
operation, protection, maintenance, repair and replacement of the Exterior Common Area which would be considered a current expense (and not a capital expenditure) pursuant to generally accepted accounting principles; and amortization of costs of the
following capital improvements to the Exterior Common Area (“Exterior Common Area Permitted Capital Costs”): (x) capital improvements required to be constructed in order to comply with any Law (excluding Hazardous Materials Laws) not in
effect or applicable to the Exterior Common Area as of the date of this Lease, (y) modification of existing or construction of additional capital improvements or building service equipment for the purpose of reducing the consumption of utility
services or Exterior Common Area Operating Expenses, or (z) replacement of capital improvements or building service equipment existing as of the date of the Date of this Lease when required because of normal wear and tear. The cost of
(i) capital repair items or Exterior Common Area Permitted Capital Costs, and (ii) resurfacing the parking lot shall be amortized at the lesser of (x) the annual rate of interest charged on the loan obtained by Landlord to finance
such improvement (or if Landlord does not obtain a loan to finance such improvement, then at two percent (2%) above the prime rate or reference rate published in the Wall Street Journal (or if such rate is not published in the Wall Street Journal,
then the prime rate or reference rate established by a national bank selected by Landlord), or (y) the maximum rate permitted by law, over the useful life of the repair or item as reasonably as reasonably determined by Landlord in accordance
with generally accepted real estate accounting principles, consistently applied, and such amortization shall be included in Exterior Common Area Operating Expenses from the date of installation or repair until the earlier of the expiration of the
useful life of the capital item or Lease Termination. 
 Notwithstanding anything to the contrary in the definition of Operating Expenses and Exterior
Common Area Operating Expenses herein or in any other provision of the Lease, Operating Expenses and Exterior Common Area Operating Expenses shall not be construed to include any amounts to the extent expressly excluded from the definition of Taxes
and shall not include any of the following: (i) depreciation; (ii) principal payments of mortgage and other non-operating debts of Landlord; (iii) the cost of repairs or other work to the extent
Landlord is reimbursed by insurance or condemnation proceeds; (iv) costs in connection with leasing space in the Building, including brokerage commissions, advertising and promotional expenses and the cost to negotiate and execute leases; lease
concessions, rental abatements and construction allowances granted to specific tenants; (v) costs incurred in connection with the sale, financing or refinancing of the Building, including brokerage commissions, consultants’,
attorneys’ and accountants’ fees, closing costs, title insurance premiums, transfer taxes, mortgage taxes and interest charges; (vi) fines, interest and penalties incurred due to the late payment; (vii) costs incurred in the
original construction of the Building, Exterior Common Area or any other part of the Project and costs of repairing, replacing or otherwise correcting defects or deficiencies in the initial design, construction or components of the improvements
comprising the Project; (viii) costs incurred in connection with the investigation, removal, remediation or clean-up of Hazardous Materials from the Project or any portion thereof (including the fees of
any environmental consultants); (ix) payment of principal and interest or other finance charges made on any debt (except to the extent expressly included in the amortization of any Operating Expenses and/or Exterior Common Area Operating Expenses)
and rental payments made 

  
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under any ground or underlying lease or leases; (x) rental for any space in the Property set aside for conference facilities, storage facilities or exercise facilities; (xi) any
“tap fees” or one-time lump sum sewer or water connection fees for the Property payable in connection with the original construction of the Project or any portion thereof; (xii) any capital
expenditures whatsoever or any cost of a capital nature, including the costs of any capital improvements, alterations or replacements, as determined in accordance with generally accepted real estate accounting principles, consistently applied (other
than Permitted Capital Costs and Exterior Common Area Permitted Capital Costs as expressly provided in the first two paragraphs of Paragraph 12.1 above); (xiii) costs incurred for any item to the extent covered by a manufacturer’s,
materialman’s, vendor’s or contractor’s warranty and paid by such manufacturer, materialman, vendor or contractor; (xiv) non-cash items such as deductions for depreciation and amortization
of the Project or the Project equipment; reserves for maintenance, repairs and replacements or any other purpose; (xv) development fees or impact fees; (xvi) the cost of installing and outfitting a specialty improvement, including, without
limitation, an observatory, cafeteria, tanning salon, ATM machine, exercise or fitness facility, or luncheon or recreational club or facility; (xvii) the costs of repair, replacement, or restoration work occasioned by any casualty or
condemnation (excluding amounts of deductibles under insurance policies maintained by Landlord (provided, however, that if Tenant’s percentage share of any such deductible is in excess of $25,000.00, Landlord shall amortize the balance of
Tenant’s percentage share of such deductible in excess of $25,000.00 in the same manner that capital repair items, Exterior Common Area Permitted Capital Costs and resurfacing the parking lot are amortized, and Tenant shall pay such
amortized sums on a monthly basis until the earlier of the expiration of the useful life of such repairs and the expiration of the Term, as it may be extended); (xviii) payments on any mortgages executed by Landlord covering Landlord’s
property, any other indebtedness of Landlord, and rental under any ground lease or leases for the Building, the Common Areas or the Project; (xix) except for management fees, Landlord’s general overhead and any overhead or profit increment
to any subsidiary or affiliate of Landlord for services on or to the Building, Common Areas or Project to the extent that the cost of such service exceeds competitive costs for such services rendered by persons or entities of similar skill,
competence and experience other than a subsidiary or affiliate of Landlord; (xx) any costs or expenses representing any amount paid for services and materials to a (personal or business) related person, firm, or entity to the extent such amount
exceeds the amount that would have been paid for such service or materials at the then existing market rates in the absence of such relationship; (xxi) compensation paid to any employee of Landlord above the grade of Property Manager/Building
Superintendent, including officers and executives of Landlord; (xxii) the cost of any work or service furnished to any tenant or occupant of the Building or Project to a materially greater extent or in a materially more favorable manner than
that furnished generally to tenants and other occupants of the Building or Project, or the costs of work or services furnished exclusively for the benefit of any tenant or occupant of the Building or Project or at such tenant’s cost;
(xxiii) the costs and expenses incurred in resolving disputes with other tenants, other occupants, or prospective tenants or occupants of the Building or Project, collecting rents or otherwise enforcing leases of the tenants of the Building or
Project; (xxiv) the costs of repairs, alterations, and general maintenance necessitated by the negligence or willful misconduct of Landlord or its agents, employees or contractors, or the cost of repairs, alterations and general maintenance
(excluding deductibles under insurance policies maintained by Landlord) necessitated by the negligence or willful misconduct of any other tenant or occupant of the Building or Project, or any of their respective agents, employees, contractors,
invitees or licensees; (xxv) any amount paid by Landlord by way of any Landlord obligation to provide an indemnity of any thirty party; (xxvi) any cost for overtime to Landlord in curing defaults by Landlord or any other tenant of the
Project or Building; or (xxvii) the costs including fines, penalties, and legal fees incurred due to violations by Landlord, its employees, agents, contractors or assigns, or any other tenant or occupant of the Building or Project of building
codes, any governmental rule or requirement or the terms and conditions of any lease pertaining to the Building or Project or any other contract. Landlord will not 

  
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collect or be entitled to collect more than one hundred percent (100%) of Operating Expenses actually paid or incurred by Landlord in connection with the operation, maintenance, repair,
replacement, security and/or management of the Building or Project in any calendar year (except that Landlord shall be permitted to collect delinquent Operating Expenses owing in any prior calendar year(s)), and Landlord shall make no profit from
Landlord’s collection of Operating Expenses (except the foregoing shall not preclude Landlord from receiving property management fees as part of Operating Expenses subject to the cap on management fees equal to 3% of the monthly Base Rent
received by Landlord from tenants of the Building, including, Tenant). 
 The specific examples of Operating Expenses and Exterior Common
Area Operating Expenses stated in this Paragraph 12.1 are in no way intended to and shall not limit the costs comprising Operating Expenses and Exterior Common Area Operating Expenses, nor shall such examples be deemed to obligate Landlord to
incur such costs or to provide such services or to take such actions except as Landlord may be expressly required in other portions of this Lease, or except as Landlord, in its reasonable discretion, may elect. All reasonable costs incurred by
Landlord in good faith for the operation, maintenance, repair, security and management of the Building or the Exterior Common Area, as the case may be, shall be deemed conclusively binding on Tenant. 

12.2 Payment of Operating Expenses by Tenant. Prior to the Commencement Date, and annually thereafter, Landlord shall deliver to Tenant
an estimate of Operating Expenses for the succeeding year. Tenant’s payment of Operating Expenses shall be based upon Landlord’s reasonable estimate of Operating Expenses and shall be payable in equal monthly installments in advance on the
first day of each calendar month commencing on the Commencement Date as specified in Paragraph 1.8 and continuing throughout the Lease Term, as the same may be extended. Tenant shall pay to Landlord, as Additional Rent and without deduction or
offset, an amount equal to Tenant’s percentage share (stated in Paragraph 1.12 above) of the Operating Expenses. Alternatively, as Landlord may elect at any time or from time to time, Operating Expenses actually incurred or paid by
Landlord but not theretofore billed to Tenant, or certain of them, as invoiced by Landlord shall be payable by Tenant within thirty (30) days after receipt of Landlord’s invoice, but not more often than once each calendar month. 

Landlord shall revise its estimate of Operating Expenses on an annual basis, and Landlord may adjust the amount of Tenant’s monthly
installment in the event of a material change in Operating Expenses, but not more than once during any calendar year. 
 Landlord shall
furnish Tenant an annual reconciliation statement (and a statement within one hundred eighty (180) days after Lease Termination) showing the actual Operating Expenses for the period to which Landlord’s estimate pertains and shall
concurrently either bill Tenant for the balance due (payable upon within thirty (30) days after receipt of written demand by Landlord) or credit Tenant’s account for the excess previously paid. Notwithstanding anything to the contrary
contained in this Lease, within ninety (90) days after receipt by Tenant of Landlord’s statement of Operating Expenses prepared pursuant to this Paragraph 12.2 for any prior annual period during the Lease Term, any employee of Tenant
or a certified public accountant mutually acceptable to Landlord and Tenant (provided such certified public accountant charges for its service on an hourly basis and not based on a percentage of any recovery or similar incentive method) shall have
the right to inspect the books of Landlord applicable to Operating Expenses for the immediately preceding year during the business hours of Landlord and upon not less than five (5) business days’ advance notice, at Landlord’s office
or, at Landlord’s option, such other location as Landlord reasonably may specify, for the purpose of verifying the information contained in the statement. All expenses of such inspection shall be borne by Tenant. If Tenant’s inspection
reveals a discrepancy in the comparative annual reconciliation statement, Tenant shall deliver 

  
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a copy of the inspection report and supporting calculations to Landlord within thirty (30) days after completion of the inspection. If Tenant and Landlord are unable to resolve the
discrepancy within thirty (30) days after receipt of the inspection report, either party may upon written notice to the other have the matter decided by an inspection by an independent certified public accounting firm approved by Landlord and
Tenant (the “CPA Firm”), which approval shall not be unreasonably withheld or delayed. If the inspection by the CPA Firm shows that the actual amount of Operating Expenses payable by Tenant is greater than the amount previously paid by
Tenant for such accounting period, Tenant shall pay Landlord the difference within thirty (30) days after the inspection by the CPA Firm. If the inspection by the CPA firm shows that the actual amount is less than the amount paid by Tenant,
then the difference shall be applied in payment of the next estimated monthly installments of Operating Expenses owing by Tenant, or in the event such accounting follows the expiration of the Term hereof, such difference shall be refunded to Tenant.
Tenant may not withhold payment of any Operating Expenses pending completion of any inspection or audit of Operating Expenses. Unless Tenant asserts specific errors within ninety (90) days after receipt of the annual reconciliation statement,
such statement shall be deemed correct as between Landlord and Tenant. 
 Notwithstanding anything to the contrary contained in this Lease,
if Landlord has not provided a reconciliation statement to Tenant within twelve (12) months after the end of any calendar year during the Term, Tenant shall not be obligated to pay for such applicable calendar year for which such reconciliation
statement was not provided, Tenant’s proportionate share of Operating Expenses in excess of the estimated Operating Expenses paid by Tenant for such calendar year. 

13. Alterations and Improvements. 

13.1 In General. Except for painting the interior walls of the Premises, re-carpeting of the
carpeted areas of the Premises and minor or decorative alterations to the interior of the Premises which (i) do not impair the integrity of the Building Structure, (ii) do not adversely affect any of the Building Systems serving the
Premises or Building, (iii) are not visible from outside of the Building (iv) do not cost in excess of Seventy-Five Thousand Dollars ($75,000.00) per improvement project or Five Hundred Thousand Dollars ($500,000.00) during the Term of
this Lease, as such Term may be extended and (v) are not Specialty Alterations as defined below (collectively, “Cosmetic Alterations”), Tenant shall not make, or permit to be made, any alterations, removals, changes, enlargements,
improvements or additions, including, without limitation, Specialty Alterations as defined below (collectively “Alterations”) in, on, about or to the Premises, or any part thereof, including Alterations required pursuant to
Paragraph 6.2, without the prior written consent of Landlord (which consent shall not be unreasonably withheld, conditioned or delayed) and without acquiring and complying with the conditions of all permits required for such Alterations by any
governmental authority having jurisdiction thereof. Landlord acknowledges that Landlord will advise Tenant in writing of (i) its grant or denial of consent for such Alterations, and (ii) whether Landlord will require Tenant to remove any
Specialty Alterations (as defined below) and repair any damage caused by such removal, in each case within ten (10) business days after Landlord’s receipt of Tenant’s written notice to Landlord requesting the same. At the time Tenant
requests Landlord’s consent to any Specialty Alterations, Tenant shall request a decision from Landlord in writing as to whether Landlord will require Tenant, at Tenant’s expense, to remove any such Specialty Alterations and repair any
damage caused by such removal. If Landlord fails to respond with such ten (10) business day period, then Tenant may deliver a second written notice to Landlord containing the same request as provided above, which second notice shall contain the
following provisions in bold, capitalized letters: “IF YOU FAIL TO RESPOND TO THIS REQUEST WITHIN TEN (10) BUSINESS DAYS FOLLOWING YOUR RECEIPT OF THIS NOTICE, THEN YOU ARE DEEMED TO HAVE CONSENTED TO THE SPECIALTY ALTERATIONS

  
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DESCRIBED IN THIS NOTICE AND TO HAVE AGREED THAT TENANT IS NOT REQUIRED TO REMOVE SUCH SPECIALTY ALTERATIONS DESCRIBED IN THIS NOTICE AT THE EXPIRATION OR EARLIER TERMINATION OF THIS
LEASE.”. In such event of Landlord’s deemed consent, Tenant will not be required to remove at Lease Termination any such Specialty Alterations described in Tenant’s second notice to Landlord as provided above. For purposes of this
Lease “Specialty Alterations” shall mean “Specialty Alterations” shall mean any of the following Alterations: (a) safes and vaults; (b) specialized flooring (including raised flooring) and/or labs; (c) conveyors
and dumbwaiters; (d) any Alterations which (i) perforate a floor slab in the Premises or a wall that encloses/encapsulates the Building Structure, or (ii) involve material plumbing connections (such as kitchens and executive bathrooms
outside of the Building core); (e) special security equipment, and (f) any other installations, additions, improvements or alterations not typically found in general use office space or requiring over-standard demolition or restoration costs
for the removal or restoration thereof. Tenant shall not be obligated to obtain Landlord’s prior written consent to any Cosmetic Alterations referred to above, and Cosmetic Alterations shall not be Specialty Alterations, but such Cosmetic
Alterations shall be subject to all of the other terms and conditions of this Paragraph 13.1 and 13.2 below. The term “Alterations” as used in this Paragraph 13 shall also include, without limitation, all heating, lighting,
electrical (including all wiring, conduit outlets, drops, buss ducts, main and subpanels), air conditioning and partitioning in the Premises made by Tenant regardless of how affixed to the Premises. As a condition to the giving of its consent,
Landlord may impose such reasonable requirements as Landlord reasonably may deem necessary, including without limitation, the manner in which the work is done; a reasonable right of approval of the contractor by whom the work is to be performed; the
times during which the work is to be accomplished; the requirement that Tenant post a completion bond in an amount and form reasonably satisfactory to Landlord for Alterations costing in excess of $250,000.00; and the requirement that Tenant
reimburse Landlord, as Additional Rent, for Landlord’s actual and reasonable costs for outside consultants incurred in reviewing any proposed Alteration, whether or not Landlord’s consent is granted. In the event Landlord consents to the
making of any Alterations by Tenant, the same shall be made by Tenant at Tenant’s sole cost and expense, in accordance with the plans and specifications approved by Landlord and in a manner causing Landlord and Landlord’s agents and other
tenants of the Building the least interference and inconvenience practicable under the circumstances. Tenant shall give written notice to Landlord five (5) business days prior to employing any laborer or contractor to perform services related
to, or receiving materials for use upon the Premises, and prior to the commencement of any work of improvement on the Premises. Any Alterations, including, without limitation, Cosmetic Alterations, to the Premises made by Tenant or any of its
agents, employees, contractors, subcontractors or other representatives shall be made in accordance with applicable Laws and in a first-class workmanlike manner. In making any such Alterations, Tenant shall, at Tenant’s sole cost and expense,
file for and secure and comply with any and all permits or approvals required by any governmental departments or authorities having jurisdiction thereof and any utility company having an interest therein. In no event shall Tenant make any structural
changes to the Premises or make any changes to the Premises which would weaken or impair the integrity of the Building Structure or adversely affect any of the Building Systems serving the Building or Premises. Landlord agrees not to charge any
construction management or supervision fee for any Alterations, including those Alterations which would require Landlord’s consent pursuant to the terms above. 

13.2 Removal Upon Lease Termination. Notwithstanding anything to the contrary in this Lease, Tenant shall have no obligation to remove
any of the Initial Improvements (as defined in Exhibit C to this Lease). If Tenant fails to obtain Landlord’s consent (or deemed consent as provided in Paragraph 13.1 above) to any Alterations for which Landlord’s consent is
required under this Lease, then, Landlord may elect to have all or a portion of such Alterations that were not consented to (or deemed consented to) by Landlord removed by Tenant at Lease Termination at Tenant’s sole cost (or deemed

  
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consent) and Tenant shall, at Tenant’s sole cost, repair all damage to the Project arising from such removal. In the event Tenant fails to remove any such Specialty Alterations designated by
Landlord for removal, Landlord, without waiving any or all other rights and remedies available to Landlord, may remove such Specialty Alterations and repair any damage caused by their removal, and may recover from Tenant all costs and expenses
actually incurred thereby, together with an amount equal to the fair rental value of the Premises for the period of time after Lease Termination required for Landlord to accomplish such removal and restoration. Tenant’s obligation to pay such
costs and expenses to Landlord shall survive Lease Termination. Unless Landlord elects to have Tenant remove (or, upon Tenant’s failure to obtain Landlord’s decision, Landlord removes) any such Specialty Alterations, all such Specialty
Alterations (except for moveable furniture, personal property and moveable equipment, and signage and trade fixtures of Tenant, which shall be removed, or caused to be removed, Tenant at no cost to Landlord), shall become the property of Landlord
upon Lease Termination (without any payment therefor) and remain upon and be surrendered with the Premises at Lease Termination. 
 13.3
Landlord’s Improvements. All fixtures, improvements or equipment which are installed, constructed on or attached to the Premises, Building or Common Area by Landlord shall be a part of the realty and belong to Landlord.

 14. Default and Remedies. 

14.1 Events of Default. The term “Default by Tenant” as used in this Lease shall mean the occurrence of any of the following
events: 
 (a) Tenant’s failure to pay when due any Rentals and such failure is not cured within three (3) days after delivery of
written notice from Landlord specifying such failure to pay; 
 (b) Commencement and continuation for at least sixty (60) days of any
case, action or proceeding by, against or concerning Tenant under any federal or state bankruptcy, insolvency or other debtor’s relief law, including without limitation, (i) a case under Title 11 of the United States Code concerning
Tenant, whether under Chapter 7, 11, or 13 of such Title or under any other Chapter, or (ii) a case, action or proceeding seeking Tenant’s financial reorganization or an arrangement with any of Tenant’s creditors; 

(c) Voluntary or involuntary appointment of a receiver, trustee, keeper or other person who takes possession for more than sixty
(60) days of substantially all of Tenant’s assets or of any asset used in Tenant’s business on the Premises, regardless of whether such appointment is as a result of insolvency or any other cause; 

(d) Execution of an assignment for the benefit of creditors of substantially all assets of Tenant available by law for the satisfaction of
judgment creditors; 
 (e) Commencement of proceedings for winding up or dissolving (whether voluntary or involuntary) the entity of Tenant,
if Tenant is a corporation, limited liability company or a partnership; 
 (f) Levy of a writ of attachment or execution on Tenant’s
interest under this Lease, if such writ continues for a period of thirty (30) days; 

  
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 (g) An assignment of the Lease by Tenant, any sublet by Tenant of the Premises or any portion of
the Premises, any other transfer of all or a portion of Tenant’s interest in the Premises or Lease (any of the foregoing being a “Transfer”) or attempted Transfer of this Lease or the Premises by Tenant in violation of the provisions
of Paragraph 24 below and such violation is not cured within ten (10) days after written notice of such violation if given by Landlord to Tenant; 

(h) Failure of Tenant to execute any instruments evidencing subordination of this Lease that Tenant is required to execute pursuant to the
terms of Paragraph 20.2 below within the time period set forth in Paragraph 20.2 where such failure is not cured within ten (10) business days after written notice of such failure is given by Landlord to Tenant; 

(i) Failure of Tenant to execute any reasonable modification of this Lease required by a financial institution which modification meets the
requirements and conditions set forth in Paragraph 20.3 below where such failure is not cured within ten (10) business days after written notice of such failure is given by Landlord to Tenant; 

(j) Failure of Tenant to execute any estoppel certificate or provide financial statements that Tenant is required to execute or provide
pursuant to the terms of Paragraph 20.5 below within the applicable time period set forth in Paragraph 20.5 where such failure is not cured within ten business (10) days after written notice of such failure is given by Landlord to Tenant; 

(k) Breach by Tenant of any term, covenant, condition, warranty, or provision contained in this Lease (other than those referred to in any
other subsection of this Paragraph 14.1) or of any other obligation owing or due to Landlord and such breach is not cured within thirty (30) days after written notice of such breach is given by Landlord to Tenant (or if a breach under this
subparagraph 14.1(k) cannot be reasonably cured within thirty (30) days, if Tenant does not commence to cure the breach within the thirty (30) day period or does not diligently and in good faith prosecute the cure to completion); 

(l) Any other Default by Tenant expressly set forth elsewhere in this Lease. For avoidance of doubt, Tenant’s vacation of the Premises
while Tenant is not in default of any other provision of this Lease shall not be deemed a Default by Tenant. 
 14.2 Remedies. Upon
any Default by Tenant, Landlord shall have the following remedies, in addition to all other rights and remedies provided by law, to which Landlord may resort cumulatively or in the alternative: 

14.2.1 Termination. Landlord may terminate this Lease by giving written notice of termination to Tenant, in which event this Lease
shall terminate on the date set forth for termination in such notice. In the event Landlord terminates this Lease, Landlord shall have the right to recover from Tenant: 

(a) The worth at the time of award of the unpaid Rentals which had been earned at the time of termination; 

(b) The worth at the time of award of the amount by which the unpaid Rentals which would have been earned after termination until the time of
award exceeds the amount of such rental loss that Tenant proves could have been reasonably avoided; 

  
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 (c) The worth at the time of award (computed by discounting at the discount rate of the Federal
Reserve Bank of San Francisco at the time of award plus one percent) of the amount by which the Rentals for the balance of the Lease Term after the time of award exceed the amount of such rental loss that Tenant proves could be reasonably avoided;

 (d) Any other amounts necessary to compensate Landlord for all detriment proximately caused by the Default by Tenant or which in the
ordinary course of events would likely result, including without limitation the following: 
 (i) Expenses in retaking possession of the
Premises; 
 (ii) Expenses for cleaning, repairing or restoring the Premises; 

(iii) Any unamortized real estate brokerage commission paid in connection with this Lease; 

(iv) Expenses for removing, transporting, and storing any of Tenant’s property left at the Premises (although Landlord shall have no
obligation to remove, transport, or store any such property); 
 (v) Expenses of reletting the Premises, including without limitation,
brokerage commissions and reasonable attorneys’ fees; 
 (vi) Reasonable attorneys’ fees and court costs; and 

(vii) Costs of carrying the Premises such as repairs, maintenance, taxes and insurance premiums, utilities and security precautions (if any).

 (e) The “worth at the time of award” of the amounts referred to in subparagraphs (a) and (b) of this Paragraph 14.2.1
is computed by allowing interest at an annual rate equal to the greater of: ten percent (10%); or five percent (5%) plus the rate established by the Federal Reserve Bank of San Francisco, as of the twenty-fifth (25th) day of the month immediately
preceding the Default by Tenant, on advances to member banks under Sections 13 and 13(a) of the Federal Reserve Act, as now in effect or hereafter from time to time amended, not to exceed the maximum rate allowable by law. 

14.2.2 Continuance of Lease. Upon any Default by Tenant and unless and until Landlord elects to terminate this Lease pursuant to
Paragraph 14.2.1 above, this Lease shall continue in effect after the Default by Tenant and Landlord may enforce all its rights and remedies under this Lease, including without limitation, the right to recover payment of Rentals as they become
due. Neither efforts by Landlord to mitigate damages caused by a Default by Tenant nor the acceptance of any Rentals shall constitute a waiver by Landlord of any of Landlord’s rights or remedies, including the rights and remedies specified in
Paragraph 14.2.1 above. 

  
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 15. Damage or Destruction. 

15.1 Definition of Terms. For the purposes of this Lease, the term: (a) “Insured Casualty” means damage to or destruction
of the Premises from a cause actually insured against, or required by this Lease to be insured against, for which the insurance proceeds paid or made available to Landlord, when added to the amount of Landlord’s deductible under its casualty or
property insurance policy such damage to or destruction of the Premises, are sufficient to rebuild or restore the Premises under then existing building codes to the condition existing immediately prior to the damage or destruction; and (b)
“Uninsured Casualty” means damage to or destruction of the Premises from a cause (i) not actually insured against and not required to be insured against, or (ii) from a cause actually insured against but for which the insurance
proceeds paid or made available to Landlord, together with the amount of Landlord’s deductible applicable to such damage or destruction, are for any reason insufficient to rebuild or restore the Premises under then-existing building codes to
the condition existing immediately prior to the damage or destruction, or (iii) from a cause actually insured against, but for which the insurance proceeds are not paid or made available to Landlord within ninety (90) days of the event of
damage or destruction, even though Landlord maintained the insurance required by this Lease. 
 15.2 Insured Casualty.

15.2.1 Rebuilding Required. In the event of an Insured Casualty where the extent of damage or destruction is less than thirty-three and
one-third percent (33 and 1/3%) of the then full replacement cost of the Premises, Landlord shall rebuild or restore the Premises to the condition existing immediately prior to the damage or destruction,
promptly following receipt of all required governmental permits and approvals, and with all due diligence, provided that there exist no governmental codes or regulations that would prevent Landlord’s ability to so rebuild or restore (and if
there exists any governmental codes or regulations that would prevent altogether Landlord’s ability to rebuild or restore, Landlord shall terminate this Lease by written notice to Tenant within sixty (60) days after the event of damage or
destruction). 
 15.2.2 Landlord’s Election. In the event of an Insured Casualty where the extent of damage or
destruction is equal to or greater than thirty-three and one-third percent (33 and 1/3%) of the then full replacement cost of the Premises, Landlord may, at its option and at its sole discretion, rebuild or
restore the Premises to the condition existing immediately prior to the damage or destruction (which, if so elected, shall be performed promptly following receipt of all required governmental permits and approvals and with all due diligence), or
terminate this Lease. Landlord shall notify Tenant in writing within sixty (60) days after the event of damage or destruction of Landlord’s election to either rebuild or restore the Premises or terminate this Lease. Notwithstanding the
foregoing to the contrary, Landlord shall not have the right to terminate this Lease pursuant to this subparagraph if Landlord failed to carry the insurance required by Section 8.1 of this Lease. Notwithstanding anything to the contrary
contained in this Lease, if Landlord carried the required insurance by this Lease but elects to terminate this Lease pursuant to this subparagraph due to lack of funds, Tenant shall have the right, at Tenant’s sole election, to contribute any
shortfall, in which case Landlord’s election to terminate shall be of no further force or effect and Landlord shall rebuild or restore the Premises pursuant to the provisions of this Article 15. If Landlord is obligated to rebuild or restore
the Premises pursuant to the terms of the immediately preceding sentence, then, as a condition precedent to such obligation, Tenant shall contribute to Landlord in cash the shortfall in funds prior to the date that Landlord notifies Tenant that
Landlord is ready to commence, or cause to be commenced, the rebuilding or restoration of the Premises. Such notice by Landlord to Tenant shall be given to Tenant at least thirty (30) days prior to the date that Landlord intends to commence, or
cause to be commenced, the rebuilding or restoration of the Premises. 
 15.2.3 Continuance of Lease. If Landlord is required to
rebuild or restore the Premises pursuant to Paragraph 15.2.1 or if Landlord elects to rebuild or restore the Premises pursuant to Paragraph 15.2.2, this Lease shall remain in effect and Tenant shall have no claim against Landlord for
compensation for inconvenience or loss of business during any period of repair or restoration. 

  
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 15.3 Uninsured Casualty. In the event of an Uninsured Casualty, Landlord may, at its
option and at its sole discretion (i) rebuild or restore the Premises as soon as reasonably possible at Landlord’s expense to the condition existing immediately prior to the damage or destruction (which, if so elected, shall be performed
promptly following receipt of all required governmental permits and approvals and with all due diligence), in which event this Lease shall continue in full force and effect or (ii) terminate this Lease, in which event Landlord shall give
written notice to Tenant within sixty (60) days after the event of damage or destruction of Landlord’s election to terminate this Lease as of the date of the event of damage or destruction. If such Uninsured Casualty was caused by the
gross negligence or willful misconduct of Tenant or any Tenant Related Parties, then Tenant shall be liable to Landlord therefor. If Landlord elects to terminate this Lease pursuant to the provisions of this subparagraph due to lack of funds, Tenant
shall have the right, at Tenant’s sole election, to contribute any shortfall, in which case Landlord’s election to terminate shall be of no further force or effect and Landlord shall rebuild or restore the Premises pursuant to the
provisions of this Article 15. If Landlord is obligated to rebuild or restore the Premises pursuant to the terms of the immediately preceding sentence, then, as a condition precedent to such obligation, Tenant shall contribute to Landlord in cash
the shortfall in funds prior to the date that Landlord notifies Tenant that Landlord is ready to commence, or cause to be commenced, the rebuilding or restoration of the Premises. Such notice by Landlord to Tenant shall be given to Tenant at least
thirty (30) days prior to the date that Landlord intends to commence, or cause to be commenced, the rebuilding or restoration of the Premises. 

15.4 Tenant’s Election. Notwithstanding anything to the contrary contained in this Paragraph 15, Tenant may
elect to terminate this Lease in the event the Premises are damaged or destroyed and, in the reasonable opinion of Landlord’s architect or construction consultants, the restoration of the Premises cannot be substantially completed within three
hundred (300) days after the event of damage or destruction. Unless Landlord provides Tenant with notice of termination under Paragraphs 15.2, 15.3, 15.5, or 15.10 hereof, Landlord shall provide Tenant with written notice within sixty
(60) days after the event of damage or destruction of the estimated restoration period (including whether, in the reasonable opinion of Landlord’s architects or construction consultants, the restoration of the Premises can be substantially
completed within said 300-day-period). Tenant’s election to terminate under this Paragraph 15.4 shall be made by written notice to Landlord within ten
(10) business days after Tenant receives from Landlord the estimate of the time needed to complete repair or restoration of the Premises. If Tenant does not deliver said notice within said ten (10) business day period, Tenant may not later
terminate this Lease even if substantial completion of the rebuilding or restoration occurs subsequent to said three hundred (300) day period, provided that Landlord is proceeding with due diligence to rebuild or restore the Premises. If Tenant
delivers said notice within said ten (10) business day period, this Lease shall terminate as of the date of the event of damage or destruction. Notwithstanding anything to the contrary contained in this Lease, if Landlord elects to restore the
Premises and Tenant notifies Landlord that Tenant does not elect to terminate this Lease, and Landlord fails to complete the restoration within the three hundred (300) day period, as such three hundred (300) day period shall be extended
one (1) day for each day that Landlord is delayed in completing such restoration due to any act, omission, negligence or willful misconduct of Tenant or any Tenant Related Parties and/or any Force Majeure Delays (as defined below), Tenant shall
have the right to deliver to Landlord written notice of its election to terminate this Lease on the date that is thirty (30) days after the date of Landlord’s receipt of Tenant’s notice, and if Landlord fails to complete the
restoration within the thirty (30) day period, this Lease shall terminate as of the date that is thirty (30) days after the date of Landlord’s receipt of Tenant’s notice. For purposes of the immediately preceding sentence, the
term “Force Majeure Delays” shall mean any delay in the completion of the restoration of the Premises due to (i) strike, lockout, or other labor or industrial disturbance, civil disturbance, judicial order, governmental

  
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rule or regulation, act of public enemy, war, riot, sabotage, blockade, embargo, inability to secure customary materials or supplies; (ii) inability to secure building permits and approvals;
(iii) delay in the restoration of the Premises despite Landlord’s diligent efforts to complete same, because of changes in any laws subsequent to the execution date of this Lease or changes in the interpretation of any such law by the
applicable building department; (iv) lightning, earthquake, fire, storm, flood, washout, explosion, or (v) any other causes beyond Landlord’s reasonable control; however, such Force Majeure Delays shall not exceed ninety
(90) days in the aggregate. 
 15.5 Damage or Destruction Near End of Lease Term.. Notwithstanding anything to the contrary
contained in this Paragraph 15, in the event the Premises are damaged or destroyed in whole or in part from any cause during the last twelve (12) months of the Lease Term and cannot reasonably be restored within sixty (60) days,
Landlord (or Tenant provided such damage or destruction was not caused by the gross negligence or willful misconduct of Tenant or any Tenant Related Parties) may, at its option, terminate this Lease as of the date of the event of damage or
destruction by giving written notice to the other of its election to do so within thirty (30) days after the event of such damage or destruction. 

15.6 Termination of Lease. If the Lease is terminated pursuant to this Paragraph 15, the current Rentals shall be proportionately
reduced during the period following the event of damage or destruction until the termination date, based upon the extent to which the damage or destruction renders the Premises unsuitable for the operation of Tenant’s business (as reasonably
determined by Landlord and Tenant in good faith) and Tenant and Tenant Related Parties are not using such unsuitable area. 
 15.7
Abatement of Rentals. If the Premises are to be rebuilt or restored pursuant to this Paragraph 15, the then current Rentals shall be proportionately reduced from the date of such damage or destruction to the Premises, or applicable part
thereof, until such damage is fully restored, based upon the extent to which the damage or destruction renders the Premises unsuitable for the operation of Tenant’s business (as reasonably determined by Landlord) and Tenant and Tenant Related
Parties are not using such unsuitable area. 
 15.8 Liability for Personal Property. Except to the extent arising out of the gross
negligence or willful misconduct Landlord or that of its agents, employees or contractors (and then subject to the provisions of Paragraph 8.6 above), in no event shall Landlord have any liability for, nor shall it be required to repair or restore,
any injury or damage to any Alterations to the Premises made by Tenant or any Tenant Related Parties at the expense of Tenant or any Tenant Related Parties (or through an allowance provided by Landlord), or any of Tenant’s trade fixtures,
office equipment, merchandise, office furniture, or any other personal property installed by Tenant (or any Tenant Related Parties). If Landlord or Tenant does not elect to terminate this Lease pursuant to this Paragraph 15, then following
Landlord’s substantial completion of the Landlord’s restoration work under this Paragraph 15, Tenant shall be obligated to promptly rebuild or restore all Alterations to the Premises made by Tenant or any Tenant Related Parties that were
damaged or destroyed to substantially the same condition existing immediately prior to the damage or destruction in accordance with the provisions of Paragraph 13.1. 

15.9 Waiver of Civil Code Remedies. Landlord and Tenant acknowledge that the rights and obligations of the parties upon damage or
destruction of the Premises are as set forth herein; therefore Tenant hereby expressly waives any rights to terminate this Lease upon damage or destruction of the Premises, except as specifically provided by this Lease, including without limitation
any rights pursuant to the provisions of Subdivision 2 of Section 1932 and Subdivision 4 of Section 1933 of the California Civil Code, as amended from time to time, and the provisions of any similar law hereinafter enacted, which
provisions relate to the termination of the hiring of a thing upon its substantial damage or destruction. 

  
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 15.10 Damage or Destruction to the Building. The foregoing notwithstanding, in the event
the Building is damaged or destroyed to the extent of more than thirty-three and one-third percent (33 1/3%) of the then replacement cost thereof, Landlord may elect to terminate this Lease so long as Landlord
terminates the leases of all other tenants in the Building, whether or not the Premises are damaged. Landlord shall notify Tenant of its election to terminate under this Paragraph 15.10 within sixty (60) days of the event of such damage or
destruction. 
 16. Condemnation. 

16.1 Definition of Terms. For the purposes of this Lease, the term: (a) “Taking” means a taking of the Premises, Common
Area, or Building or damage related to the exercise of the power of eminent domain and includes, without limitation, a voluntary conveyance, in lieu of court proceedings, to any agency, authority, public utility, person or corporate entity empowered
to condemn property; (b) “Total Taking” means the Taking of the entire Premises or so much of the Premises, Building or Common Area as to prevent or substantially impair the use thereof by Tenant for the uses herein specified;
provided, however, that in no event shall the Taking of less than twenty percent (20%) of the Premises or fifty percent (50%) of the Building and Common Area be considered a Total Taking; (c) “Partial Taking” means the Taking of
twenty percent (20%) or less of the Premises, Building or Common Area for six (6) months or less; (d) “Date of Taking” means the date upon which the title to the Premises, Building or Common Area or a portion thereof, passes to
and vests in the condemnor or the effective date of any order for possession if issued prior to the date title vests in the condemnor; and (e) “Award” means the amount of any award made, consideration paid, or damages ordered as a
result of a Taking. 
 16.2 Rights. The parties agree that in the event of a Taking all rights between them or in and to an Award
shall be as set forth herein. 
 16.3 Total Taking. In the event of a Total Taking during the Lease Term: (a) the rights of
Tenant under this Lease and in the leasehold estate of Tenant (and the rights of Tenant in and to the Premises and right to use the Common Area) shall cease and terminate as of the Date of Taking; (b) Landlord shall refund to Tenant any prepaid
Base Rent that has not then been applied; (c) Tenant shall pay Landlord any Rentals due Landlord under the Lease, prorated as of the Date of Taking; (d) to the extent the Award is not payable to the beneficiary or mortgagee of a deed of
trust or mortgage affecting the Premises, Tenant shall receive from the Award those portions of the Award attributable to trade fixtures of Tenant; and (e) the remainder of the Award shall be paid to and be the property of Landlord. Nothing
contained in this Paragraph 16.3 shall be deemed to deny Tenant its right to recover awards made by the condemning authority for moving costs, relocation costs, and costs attributable to goodwill and Alterations installed by Tenant to the
extent paid for by Tenant. 
 16.4 Partial Taking. In the event of a Partial Taking during the Lease Term: (a) the rights of
Tenant under the Lease and in the leasehold estate of Tenant in and to the portion of the Premises taken shall cease and terminate as of the Date of Taking; (b) from and after the Date of Taking the Base Rent shall be an amount equal to the
product obtained by multiplying the then current Base Rent by the quotient obtained by dividing the fair market value of the Premises immediately after the Taking by the fair market value of the Premises immediately prior to the Taking; (c) to
the extent the Award is not payable to the beneficiary or mortgagee of a deed of trust or mortgage affecting the Premises, Tenant 

  
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shall receive from the Award the portions of the Award attributable to trade fixtures; and (d) the remainder of the Award shall be paid to and be the property of Landlord. Each party waives
the provisions of California Code of Civil Procedure Section 1265.130 allowing either party to petition the Superior Court to terminate this Lease in the event of a Partial Taking. Nothing contained in this Paragraph 16.4 shall be deemed
to deny Tenant its right to recover awards made by the condemning authority for moving costs, relocation costs, and costs attributable to goodwill and leasehold improvements installed by Tenant. Notwithstanding anything to the contrary contained in
this Lease, if twenty percent (20%) or more of the Premises is taken by any agency, authority, public utility, person or corporate entity empowered to condemn property for more than six (6) months, Tenant shall have the right to terminate this
Lease. 
 17. Liens. 

17.1 Premises to Be Free of Liens. Tenant shall pay for all labor and services performed for, and all materials used by or furnished to
Tenant, any Tenant Related Parties, or any contractor employed by Tenant (or any Tenant Related Party) with respect to the Premises. Tenant shall indemnify, defend and hold Landlord harmless from and keep the Project free from any liens, claims,
demands, encumbrances, or judgments, including all costs, liabilities and attorneys’ fees with respect thereto, created or suffered by reason of any labor or services performed for, or materials used by or furnished to, Tenant or any Tenant
Related Parties or any contractor employed by Tenant with respect to the Premises; provided, however, in no event shall the foregoing be construed as requiring Tenant to indemnify, defend, protect or hold harmless the Landlord for any claims,
demands, encumbrances, or judgments, including all costs, liabilities and attorneys’ fees with respect thereto to the extent caused by the negligence or willful misconduct of Landlord or its employees, contractors or agents. Tenant’s
obligations under the immediately preceding sentence shall survive Lease Termination. Landlord shall have the right, at all times, to post and keep posted on the Premises, as the case may be, any notices permitted or required by law, or which
Landlord shall deem proper for the protection of Landlord and the Premises, Building, Common Area, and Land, and any other party having an interest therein, from mechanics’ and materialmen’s liens, including without limitation a notice of non-responsibility. 
 17.2 Notice of Lien; Bond. Should any claims of lien be filed against, or any
action filed to assert a claim of lien be commenced affecting the Premises, Tenant’s interest in the Premises or any other portion of the Project, Tenant shall give Landlord notice of such lien or action within five (5) business days after
Tenant receives notice of the filing of the lien or the commencement of the action. In the event that Tenant shall not, within twenty (20) days following the date Tenant becomes aware of the imposition of any such lien arising from or in
connection with labor or services performed for, or materials used by or furnished to, Tenant, any Tenant Related Parties or any of Tenant’s invitees or any contractor employed by Tenant with respect to the Premises, cause such lien to be
released of record by payment or posting of a proper bond, Landlord shall have, in addition to all other remedies provided herein and by law, the right, but not the obligation, to cause the same to be released by such means as Landlord shall deem
proper, including payment of the claim giving rise to such lien or posting of a proper bond. All such sums paid by Landlord and all expenses incurred by Landlord in connection therewith, including reasonable attorneys’ fees and costs, shall be
payable to Landlord by Tenant as Additional Rent within thirty (30) days after receipt of written demand. 
 18.
Landlord’s Right of Access to Premises. Landlord reserves and shall have the right and Tenant shall permit (and cause all Tenant Related Parties to permit) Landlord and Landlord’s agents and employees and designated
consultants, contractors and other representatives to enter the Premises at any reasonable time during normal business hours with reasonable prior notice (except in the event of an 

  
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emergency) and subject to any reasonable security measures of Tenant for the purpose of (i) inspecting the Premises, (ii) performing Landlord’s maintenance and repair
responsibilities set forth herein, (iii) posting notices of non-responsibility, (iv) placing upon the Premises at any time “For Sale” signs, (v) placing on the Premises ordinary
“For Lease” signs at any time within one hundred eighty (180) days prior to Lease Termination, or at any time there exists a Default of Tenant, or at such other times as agreed to by Landlord and Tenant, (vi) protecting the
Premises in the event of an emergency and (vii) exhibiting the Premises to prospective purchasers or lenders at any reasonable time (or to prospective tenants during the last nine (9) months of the Term). In the event of an emergency,
Landlord shall have the right to use any and all means which Landlord reasonably may deem proper to gain access to the Premises. Any entry to the Premises by Landlord or Landlord’s agents, employees, consultants or contractors in accordance
with this Paragraph 18 or any other provision of this Lease shall not under any circumstances be construed or deemed to be a forcible or unlawful entry into, or a detainer of the Premises, or an eviction of Tenant from the Premises (unless
Tenant is denied all beneficial use of the Premises for twelve (12) consecutive months or more) or any portion thereof nor give Tenant the right to abate the Rentals payable under this Lease. The parenthetical set forth in the immediately
preceding sentence shall not apply to the extent the Landlord enters the Premises during the continuance of any Default by Tenant to perform, or cause to be performed, acts of maintenance or preservation or efforts to relet the Premises, including,
but not limited to alterations, remodeling, redecorating, repairs, replacements and/or painting as Landlord shall consider advisable for the purpose of reletting the Premises or any part thereof or if a receiver appointed upon the initiative of
Landlord to protect Landlord’s interest under this Lease or in the Premises enters the Premises pursuant to the terms of a receivership order. Tenant hereby waives any claims for damages for any injury or inconvenience to or interference with
Tenant’s business, any loss of occupancy or quiet enjoyment of the Premises, and, except to the extent caused by the negligence or willful misconduct of Landlord, its agents, employees or contractors (but subject to the terms of Paragraph 8.6
above), any other loss occasioned by Landlord’s or Landlord’s agents’ entry into the Premises as permitted by this Paragraph 18 or any other provision of this Lease. In no event, however, shall Landlord be liable to Tenant for
any claim of consequential damages, including, without limitation, lost profits, loss of income or loss of business. 
 19.
Landlord’s Right to Perform Tenant’s Covenants. Except as otherwise expressly provided herein, if Tenant shall at any time fail to make any payment or perform any other act required to be made or
performed by Tenant under this Lease, Landlord may upon ten (10) days written default notice to Tenant, but shall not be obligated to and without waiving or releasing Tenant from any obligation under this Lease, make such payment or perform
such other act to the extent that Landlord may deem desirable, and in connection therewith, pay expenses and employ counsel. All reasonable sums so paid by Landlord and all penalties, interest and reasonable costs in connection therewith shall be
due and payable by Tenant as Additional Rent within thirty (30) days after receipt of written demand. 
 20. Lender
Requirements. 
 20.1 Subordination. This Lease, at Landlord’s option, shall be subject and subordinate to the lien of any
mortgages or deeds of trust (including all advances thereunder, renewals, replacements, modifications, supplements, consolidations, and extensions thereof) in any amount(s) whatsoever now or hereafter placed on or against or affecting the Premises,
Building or Land, or Landlord’s interest or estate therein without the necessity of the execution and delivery of any further instruments on the part of Tenant to effectuate such subordination; provided that any such mortgagee or beneficiary
under any future mortgage or deed of trust agrees in writing that this Lease shall not be terminated or modified in any material way in the event of any foreclosure or deed in lieu of foreclosure if Tenant is not in default under this Lease beyond
applicable notice and cure periods. If any mortgagee 

  
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or beneficiary shall elect to have this Lease prior to the lien of its mortgage or deed of trust, and shall give written notice thereof to Tenant, this Lease shall be deemed prior to such
mortgage or deed of trust, whether this Lease is dated prior or subsequent to the date of such mortgage or deed of trust or the date of the recording thereof. 

20.2 Subordination Agreements. Tenant shall execute and deliver, without charge therefor, such further commercially reasonable
instruments evidencing subordination of this Lease to the lien of any mortgages or deeds of trust affecting the Premises, Building or Land as may be reasonably required by Landlord within ten (10) business days following Landlord’s request
therefor; provided that such mortgagee or beneficiary under such mortgage or deed of trust agrees in writing that this Lease shall not be terminated or modified in any material way in the event of any foreclosure or deed in lieu of foreclosure if
Tenant is not in default under this Lease beyond applicable notice and cure periods. As a condition to Tenant’s obligations under this Lease, prior to or at execution of this Lease, Landlord shall cause its existing lender holding a security
interest in the Building and Land to enter into a commercially reasonable subordination, non-disturbance and attornment agreement (“SNDA”) with Tenant that has been approved by Landlord, Lender and
Tenant, and Landlord shall deliver the same to Tenant for execution and delivery to Landlord or its lender. 
 20.3 Approval by
Lenders. Tenant recognizes that the provisions of this Lease may be subject to the approval of any financial institution that may make a loan secured by a new or subsequent deed of trust or mortgage affecting the Premises, Building or Land. If
the financial institution should require, as a condition to such financing, any reasonable modifications of this Lease in order to protect its security interest in the Premises including without limitation, modification of the provisions relating to
damage to and/or condemnation of the Premises, Tenant agrees to negotiate in good faith with Landlord and such financial institution to agree on mutually acceptable modifications and execute the appropriate amendments; provided, however, that no
modification shall substantially change the size, location or dimension of the Premises, or shall increase the Rentals payable by Tenant hereunder or shall, in any material respect, otherwise increase Tenant’s obligations under this Lease or
reduce Tenant’s rights or Landlord’s obligations under this Lease. 
 20.4 Attornment. In the event of foreclosure or the
exercise of the power of sale under any mortgage or deed of trust made by Landlord and covering the Premises, Building or Land, Tenant shall attorn to such foreclosing lender or such purchaser upon any such foreclosure or sale and recognize such
foreclosing lender or purchaser as the Landlord under this Lease. 
 20.5 Estoppel Certificates and Financial Statements. 

(a) Delivery by Tenant. Tenant shall, within ten (10) business days following written request by Landlord therefor and without
charge, execute and deliver to Landlord any and all estoppel certificates reasonably requested by Landlord in connection with the sale or financing of the Premises, Building or Land, or requested by any lender making a loan affecting the Premises,
Building or Land, or applicable part thereof. Landlord may require that Tenant in any estoppel certificate shall (i) certify that this Lease is unmodified and in full force and effect (or, if modified, state the nature of such modification and
certify that this Lease, as so modified, is in full force and effect) and has not been assigned (or, if assigned, disclosing the same), (ii) certify the date to which Rentals are paid in advance, if any, (iii) acknowledge that there are
not, to Tenant’s knowledge, any uncured defaults on the part of Landlord hereunder, or specify such defaults if claimed, (iv) evidence the status of this Lease as may be reasonably required either by a lender making a loan to Landlord to
be secured by a deed of trust or mortgage covering the Premises, Building or Land, or applicable part thereof, or a purchaser of the 

  
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Premises, Building or Land, or applicable part thereof, from Landlord, (v) certify that all improvements to be constructed on the Premises by Landlord have been substantially completed
except for punch list items which do not prevent Tenant from using the Premises for its intended use, or if substantial completion has not occurred with respect to all or any portion of such improvements, specify which improvements have not been
substantially completed, and (vi) certify such other matters relating to the Lease, the Premises and/or Common Area as may be reasonably requested by a lender making a loan to Landlord or a purchaser of the Premises, Building or Land, or
applicable part thereof, from Landlord. Any such estoppel certificate may be conclusively relied upon by any prospective purchaser or encumbrancer of the Premises, Building or Land. 

(b) Financial Statements. Within thirty (30) days after Landlord’s written request therefor (but in no event more often than
quarterly during each calendar year unless Tenant is in default hereunder beyond applicable notice and cure periods, or Landlord is selling or refinancing the Building or Project), Tenant shall furnish to Landlord copies of Tenant’s most recent
audited or certified (but unaudited) annual financial statements (in connection with the delivery of certified unaudited financial statements, the certification shall be made by an authorized representative of Tenant who is most knowledgeable
concerning the financial condition of Tenant, to that person’s actual knowledge). Such financial statements of Tenant shall include an opinion of a certified public accountant (if available) and a balance sheet and profit and loss statement for
the most recent year, or a reasonable substitute for the form of such financial information, all prepared in accordance with generally accepted accounting principles consistently applied. Landlord shall treat such financial statements and the
information therein as confidential and shall not disclose the same, including, without limitation, any information contained therein (collectively, “Confidential Information”) to anyone other than persons within Landlord’s and/or its
affiliates’ or property manager’s organization or advisors, prospective purchasers or lenders or prospective lenders who have a need to know in the course of the performance of their duties analyzing or evaluating the Confidential
Information, and Landlord shall request that persons in its organization or advisors, purchasers or lenders to keep same in strict confidence. This paragraph does not apply to Confidential Information that (i) was in the public domain at the
time of communication to Landlord; (ii) becomes known to Landlord through disclosure by sources other than Tenant having the legal right to disclose such Confidential Information; (iii) is independently acquired or developed by Landlord;
or (iv) is required to be disclosed by Landlord to comply with applicable laws or regulations (including, without limitation, pursuant to a subpoena); provided that Landlord provides prior written notice to Tenant and takes reasonable actions
to minimize the extent of disclosure. Landlord’s obligations under this Paragraph 20.5(b) shall survive expiration or earlier termination of the Lease. 

(c) Nondelivery by Tenant. Tenant’s failure to deliver an estoppel certificate as required pursuant to Paragraph 20.5(a)
above shall, in addition to Landlord’s other rights and remedies for such failure, be conclusive upon Tenant that (i) this Lease is in full force and effect, without modification except as may be represented by Landlord and has not been
assigned, (ii) there are now no uncured defaults in Landlord’s performance, (iii) no Rentals have been paid in advance except those that are set forth in this Lease, and (iv) Tenant has accepted possession of the Premises. As
provided in Paragraph 14.1(j) above, Tenant’s failure to deliver any financial statements, estoppel certificates or other documents as required pursuant to Paragraph 20.5(a) or Paragraph 20.5(b) above shall be a Default by Tenant if not
delivered to Landlord within ten (10) business days following Tenant’s receipt of written notice that such financial statements, estoppel certificates or other documents required pursuant to Paragraph 20.5(a) or Paragraph 20.5(b) are past
due. 

  
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 21. Holding Over. This Lease shall terminate without further notice at the expiration of
the Lease Term. Any holding over by Tenant (or any Tenant Related Parties) after Lease Termination shall not constitute a renewal or extension of the Lease Term, nor give Tenant any rights in or to the Premises except as expressly provided in this
Lease. If Tenant holds over after termination of this Lease without the express written consent of Landlord, Tenant shall become a tenant at sufferance only. Tenant agrees that the reasonable value of the use of the Premises during any such holding
over without consent shall be one hundred twenty-five percent (125%) for the first month of any holdover, and one hundred fifty percent (150%) for each month of holdover thereafter, of the monthly Base Rent in effect upon the date of such
termination (prorated on a daily basis), and Tenant shall continue to pay during such holdover period all Additional Rent payable by Tenant in effect upon the date of such termination (prorated on a daily basis). Acceptance by Landlord of rent after
such termination shall not constitute a hold over hereunder or result in a renewal. If Tenant remains in possession of the Premises after Lease Termination without Landlord’s consent for more than thirty (30) days, Tenant shall indemnify,
defend and hold Landlord harmless from and against any loss, damage, expense, claim or liability resulting from Tenant’s failure to surrender the Premises, including without limitation, any claims made by any succeeding tenant based on delay in
the availability of the Premises; provided, however, in no event shall the foregoing be construed as requiring Tenant to indemnify Landlord for any loss, damage, expense, claim or liability to the extent caused by the negligence or willful
misconduct of Landlord or its respective employees, contractors or agents. The provisions of this Paragraph 21 shall survive the expiration or earlier termination of this Lease. 

22. Notices. Any notice required or desired to be given under this Lease shall be in writing, and all notices shall be given by
personal delivery (which includes nationally recognized overnight courier service) or mailing. Any notice given pursuant to this Paragraph 22 shall be deemed to have been given when personally delivered (including delivery by nationally
recognized overnight courier), or if mailed, when three (3) business days have elapsed from the time when such notice was deposited in the United States mail, certified or registered mail and postage prepaid, addressed to the party at the last
address given for purposes of notice pursuant to the provisions of this Paragraph 22. At the date of execution of this Lease, the addresses of Landlord and Tenant are set forth in Paragraph 1.14 above. 

23. Attorneys’ Fees. In the event either party hereto shall bring any action or legal proceeding for damages for an
alleged breach of any provision of this Lease, to recover Rentals, to enforce an indemnity, defense or hold harmless obligation, to terminate the tenancy of the Premises, or to enforce, protect, interpret, or establish any term, condition, or
covenant of this Lease or right or remedy of either party, the prevailing party shall be entitled to recover, as a part of such action or proceeding, reasonable attorneys’ fees and court costs, including reasonable attorneys’ fees and
costs for appeal, as may be fixed by the court or jury. Notwithstanding anything to the contrary contained in this Lease, “prevailing party” as used in this paragraph shall include the party who dismisses an action for recovery hereunder
in exchange for sums allegedly due, performance of covenants allegedly breached or considerations substantially equal to the relief sought in the action. 

24. Assignment, Subletting and Hypothecation. 

24.1 In General. Tenant shall not voluntarily sell, assign or transfer all or any part of Tenant’s interest in this Lease or in the
Premises or any part thereof, sublease all or any part of the Premises, or permit all or any part of the Premises to be used by any person or entity other than Tenant or Tenant’s employees, except as specifically provided in this
Paragraph 24. 

  
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 24.2 Voluntary Assignment and Subletting. 

(a) Notice to Landlord. Tenant shall, by written notice, advise Landlord of Tenant’s desire on a stated date (which date shall not
be less than thirty (30) days nor more than ninety (90) days after the date of Tenant’s notice) to assign this Lease or to sublet all or any part of the Premises for any part of the Lease Term. Tenant’s notice referred to
immediately above shall state the name, legal composition and address of the proposed assignee or subtenant, and Tenant shall provide the following information to Landlord with said notice: a true and complete copy of the proposed assignment
agreement or sublease; a financial statement of the proposed assignee or subtenant prepared in accordance with generally accepted accounting principles within one year prior to the proposed effective date of the assignment or sublease; the nature of
the proposed assignee’s or subtenant’s business to be carried on in the Premises; the payments to be made or other consideration to be given on account of the assignment or sublease; a current financial statement of Tenant; and such other
pertinent information as may be requested by Landlord, all in sufficient detail to enable Landlord to evaluate the proposed assignment or sublease and the prospective assignee or subtenant. Tenant’s notice shall not be deemed to have been
served or given until such time as Tenant has provided Landlord with all information reasonably requested by Landlord pursuant to this Paragraph 24.2. Tenant shall immediately notify Landlord of any modification to the proposed terms of such
assignment or sublease. 
 (b) Intentionally Omitted. 

(c) Landlord’s Consent. Landlord shall not unreasonably withhold, condition or delay its consent to any proposed
assignment or subletting by Tenant on the terms and conditions specified in Tenant’s notice referred to above. Landlord shall reasonably approve or disapprove any assignment or subletting proposed by Tenant for which Landlord’s approval is
required hereunder within ten (10) business days following Landlord’s receipt of Tenant’s notice of proposed assignment or subletting and receipt of the information referred to in Paragraph 24.2(a) above. Without otherwise limiting
the criteria upon which Landlord may withhold its consent to any proposed assignment or sublease, if Landlord withholds its consent where Tenant is in default, beyond applicable notice and cure periods, at the time of the giving of Tenant’s
notice or on the effective date of any assignment or sublease, or where the net worth of the proposed assignee (according to generally accepted accounting principles) is not, in Landlord’s reasonable business judgment, sufficient to permit the
proposed assignee to perform Tenant’s remaining obligations under this Lease, such withholding of consent shall be presumptively reasonable. Fifty percent (50%) of any and all rent paid by an assignee or subtenant in excess of the Rentals
to be paid under this Lease (prorated in the event of a sublease of less than the entire Premises), after Tenant’s deduction therefrom, on an amortized basis over the balance of the Term of this Lease (until fully amortized) of (i) tenant
improvement costs paid by Tenant in order to obtain the Lease assignment or subletting in question, (ii) all reasonable brokerage commissions paid by Tenant to third parties not affiliated with Tenant in order to obtain the Lease assignment or
subletting in question, and (iii) all reasonable attorneys’ fees incurred by Tenant in connection with obtaining the Lease assignment or subletting in question shall be paid directly to Landlord, as Additional Rent, at the time and place
specified in this Lease. For the purposes of this Paragraph 24, the term “rent” shall include any consideration of any kind received, or to be received, by Tenant from an assignee or subtenant, if such sums are related to
Tenant’s interest in this Lease or in the Premises, including, but not limited to key money, bonus money, and payments (in excess of the fair market value thereof) for Tenant’s assets, fixtures, trade fixtures, inventory, accounts,
goodwill, equipment, furniture, general intangibles, and any capital stock or other equity ownership interest of Tenant. Any assignment or subletting without Landlord’s consent (where Landlord’s consent was required under the terms of this
Paragraph 24) shall be voidable at Landlord’s option, and shall constitute a default by Tenant, subject to applicable notice and cure periods. Landlord’s consent to any one assignment or sublease shall not constitute a waiver of the
provisions of this Paragraph 24 as to any subsequent assignment or sublease nor a consent to any subsequent assignment or sublease; further, Landlord’s consent to an assignment or sublease shall not release Tenant from Tenant’s
obligations under this Lease, and Tenant shall remain jointly and severally liable with the assignee or subtenant. 

  
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 (d) Assumption of Obligations. In the event Landlord consents to any assignment, such
consent shall be conditioned upon the assignee expressly assuming and agreeing to be bound by each of Tenant’s covenants, agreements and obligations contained in this Lease, pursuant to a written assignment and assumption agreement in a form
reasonably approved by Landlord. Landlord’s consent to any assignment or sublease shall be evidenced by Landlord’s signature on said assignment and assumption agreement or on said sublease or by a commercially reasonable separate written
consent prepared by Landlord and to be executed by Tenant and the applicable assignee or sublessee. In the event Landlord consents to a proposed assignment or sublease, such assignment or sublease shall be valid and the assignee or subtenant shall
have the right to take possession of the Premises only if an executed original of the assignment or sublease is delivered to Landlord, and such document contains the same terms and conditions as stated in Tenant’s notice to Landlord given
pursuant to Paragraph 24.2(a) above, except for any such modifications to which Landlord has consented in writing. 
 24.3 Collection
of Rent. Tenant hereby irrevocably gives to and confers upon Landlord, as security for Tenant’s obligations under this Lease, the right, power and authority to collect all rents from any assignee or subtenant of all or any part of the
Premises as permitted by this Paragraph 24, or otherwise, and Landlord, as assignee of Tenant, or a receiver for Tenant appointed on Landlord’s application, may collect such rent and apply it toward Tenant’s obligations under this
Lease; provided, however, that until the occurrence of any Default by Tenant, Tenant shall have the right to collect such rent. Upon the occurrence of any Default by Tenant, Landlord may at any time without notice in Landlord’s own name sue for
or otherwise collect such rent, including rent past due and unpaid, and apply the same, less costs and expenses of operation and collection, including reasonable attorneys’ fees, toward Tenant’s obligations under this Lease.
Landlord’s collection of such rents shall not constitute an acceptance by Landlord of attornment by such subtenants. In the event of a Default by Tenant, Landlord shall have all rights provided by this Lease and by law, and Landlord may, upon re-entry and taking possession of the Premises, eject all parties in possession or eject some and not others, or eject none, as Landlord shall determine in Landlord’s sole discretion. 

24.4 Corporations and Partnerships. If Tenant is a corporation or limited liability company, then, except as otherwise expressly
provided in the immediately following paragraph, any dissolution, merger, consolidation or other reorganization of Tenant, any sale or transfer (or cumulative sales or transfers) of the capital stock or membership interests of Tenant in excess of
fifty percent (50%), or any sale (or cumulative sales) of all or substantially all of the assets of Tenant shall be deemed an assignment of this Lease requiring the prior written consent of Landlord. If Tenant is a partnership, then, except as
otherwise expressly provided in the immediately following paragraph, any withdrawal or substitution (whether voluntary, involuntary, or by operation of law and whether occurring at one time or over a period of time) of any partner(s) owning fifty
percent (50%) or more (cumulatively) of the partnership, any assignment(s) of fifty percent (50%) or more (cumulatively) of any interest in the capital or profits of the partnership, or the dissolution of the partnership shall be deemed an
assignment of this Lease requiring the prior written consent of Landlord. Any such withdrawal or substitution of partners or assignment of any interest in or dissolution of a partnership tenant, and any such sale of stock, membership interests or
assets of a corporate or limited liability company tenant or dissolution, merger, consolidation or other reorganization of a corporate or limited liability company without the prior written consent of Landlord shall be a Default by Tenant hereunder.
The foregoing notwithstanding, the sale or transfer of any or all of the capital stock of a corporation, the capital stock of which is now or hereafter becomes publicly traded, shall not be deemed an assignment of this Lease. 

  
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 Notwithstanding anything to the contrary contained in this Lease, Tenant, without Landlord’s
prior written consent (but with notice to Landlord), may sublet the Premises or assign this Lease to (i) a subsidiary, affiliate or entity controlled by, which controls or is under common control with Tenant; (ii) a successor entity
related to Tenant by merger, consolidation, non-bankruptcy reorganization or government action; or (iii) a purchaser of all or substantially all of Tenant’s assets or common stock, provided that in
connection with any assignment or subletting to a successor entity or purchaser pursuant to clause (ii) or (iii) immediately above, the successor or Tenant following such purchase of all or substantially all of Tenant’s assets or common
stock has a net worth which, in Landlord’s reasonable business judgment, is sufficient to permit the proposed assignee to perform Tenant’s remaining obligations under this Lease (each, a “Permitted Transferee”). For purposes of
this Lease, a transfer or issuance of Tenant’s stock over the New York Stock Exchange, the American Stock Exchange, or NASDAQ or by virtue of a private placement with a venture capital firm or other equity investor wherein such venture capital
firm or other equity investor receives stock in Tenant shall not be deemed an assignment, subletting or other transfer of this Lease or the Premises requiring Landlord’s consent. Any right of Landlord to receive excess Rentals shall not apply
to a Permitted Transfer. 
 Notwithstanding that a Transfer is made to a Permitted Transferee, Tenant shall not be released from any of its
obligations under this Lease and a Permitted Transferee to whom this Lease is assigned shall be required to assume all of Tenant’s obligations hereunder as a condition to such transfer being permitted without Landlord’s prior written
consent. A Transfer to a Permitted Transferee shall not be subject to the provisions of Paragraph 24.2 above. 
 24.5 Reasonable
Provisions. Tenant expressly agrees that the provisions of this Paragraph 24 are not unreasonable standards or conditions for purposes of Section 1951.4(b)(2) of the California Civil Code, as amended from time to time, under bankruptcy
laws, or for any other purpose. 
 24.6 Attorneys’ Fees. Tenant shall pay, as Additional Rent, Landlord’s
reasonable attorneys’ fees for reviewing, investigating, processing and/or documenting any requested assignment or sublease, whether or not Landlord’s consent is granted, provided that such attorneys’ fees do not exceed $2,500.00 per
request for consent. 
 24.7 Involuntary Transfer. No interest of Tenant in this Lease shall be assignable involuntarily or by
operation of law, including, without limitation, the transfer of this Lease by testacy or intestacy. Each of the following acts shall be considered an involuntary assignment: 

(a) If Tenant is or becomes bankrupt or insolvent, makes an assignment for the benefit of creditors, or a proceeding under any bankruptcy law
is instituted in which Tenant is the bankrupt; or, if Tenant is a partnership or consists of more than one person or entity, if any partner of the partnership or other person or entity is or becomes bankrupt or insolvent, or makes an assignment for
the benefit of creditors; 
 (b) Levy of a writ of attachment or execution on this Lease; 

(c) Appointment of a receiver with authority to take possession of the Premises in any proceeding or action to which Tenant is a party; or

 (d) Foreclosure of any lien affecting Tenant’s interest in the Premises, which lien was not consented to by Landlord pursuant to
Paragraph 24.8. 

  
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 An involuntary assignment shall constitute a Default by Tenant and Landlord shall have the right to terminate
this Lease, in which case this Lease shall not be treated as an asset of Tenant. In the event the Lease is not terminated, the provisions of Paragraph 24.2(c) regarding rents paid by an assignee or subtenant shall apply. If a writ of attachment
or execution is levied on this Lease, or if any involuntary proceeding in bankruptcy is brought against Tenant or a receiver is appointed, Tenant shall have sixty (60) days in which to cause the attachment or execution to be removed, the
involuntary proceeding dismissed, or the receiver removed. Notwithstanding anything to the contrary contained in this Lease, in the event of a conflict between the provisions of this Section 24.7 and applicable federal or state bankruptcy law,
applicable federal or state bankruptcy law shall control. 
 24.8 Hypothecation. Tenant shall not hypothecate, mortgage or encumber
Tenant’s interest in this Lease or in the Premises or otherwise use this Lease as a security device in any manner without the consent of Landlord, which consent Landlord may withhold in its sole and absolute discretion. Consent by Landlord to
any such hypothecation or creation of a lien or mortgage shall not constitute consent to an assignment or other transfer of this Lease following foreclosure of any permitted lien or mortgage. 

24.9 Binding on Successors.. The provisions of this Paragraph 24 expressly apply to all heirs, successors, sublessees, assignees
and transferees of Tenant. 
 24.10 Assignment to Credit Assignee. 

(a) Credit Assignee. In the event that (i) Tenant assigns this Lease to a third party meeting all of the qualifications set forth
in Section 24.10(b) below (the “Credit Assignee”); (ii) the Credit Assignee has assumed in writing each of Tenant’s covenants, agreements and obligations contained in this Lease (the “Credit Assignment Agreement”);
(iii) Landlord has consented to the assignment to the Credit Assignee pursuant to the terms and conditions of this Section 24; and (iv) the Credit Assignee has delivered to Landlord the Cash Security Deposit required by Section 1.13
above, Tenant shall be fully and finally released from its obligations under this Lease arising from and after the effective date of the assignment (the “Credit Assignment Date”). In no event shall the Credit Assignment Agreement be
construed as granting or conferring upon Tenant and the Credit Assignee any greater rights than those contained in this Lease, nor shall there be any diminution of the rights and privileges of the Landlord under this Lease, nor shall this Lease be
deemed modified in any respect. It is specifically understood that Landlord is not a party to the Credit Assignment Agreement and, notwithstanding anything to the contrary contained in the Credit Assignment Agreement, Landlord is not bound by
any terms, provisions, representations or warranties contained therein. In the event of any conflict between the terms of the Credit Assignment Agreement and this Lease, the terms and conditions of this Lease shall control and supersede the
Credit Assignment Agreement. The release provisions of this Paragraph 24.10(a) shall be personal to Bloom Energy Corporation and shall not apply to any other Tenant under this Lease. 

(b) Qualifications. A “Credit Assignee” is an entity that, as of the effective date of the assignment referred to in
Paragraph 24.10(a) above, is rated BBB or higher by a reputable credit reporting agency, or is unofficially and privately rated BBB or higher by a reputable credit reporting agency. 

  
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 25. Successors. Subject to the provisions of Paragraph 24 above and
Paragraph 30.2(a) below, the covenants, conditions, and agreements contained in this Lease shall be binding on the parties hereto and on their respective heirs, successors and assigns. 

26. Landlord Default; Mortgagee Protection. Landlord shall not be in default under this Lease unless Tenant shall have given Landlord
written notice of the breach and, within thirty (30) days after notice, Landlord has not cured the breach or, if the breach is such that it cannot reasonably be cured under the circumstances within thirty (30) days, has not commenced such
cure within such thirty (30) day period or fails to diligently prosecute the cure to completion. Any money judgment obtained by Tenant based upon Landlord’s breach of this Lease shall be satisfied only out of Landlord’s interest in
the Project and the sales, rental, insurance and condemnation proceeds therefrom (whether by Landlord or by execution of judgment). In the event of any breach or default of this Lease by Landlord, Tenant shall not have any recourse against any of
Landlord’s members, manager, officers, directors, shareholders, or partners with respect to such breach and under no circumstances shall Landlord be liable to Tenant for any claim of consequential damages, including, without limitation, lost
profits, loss of income or loss of business. In the event of any default on the part of Landlord under this Lease, Tenant shall give notice by registered or certified mail or nationally recognized overnight courier to any beneficiary of a deed of
trust or any mortgagee of a mortgage affecting the Premises, Building or Land whose address shall have been furnished to Tenant, and shall offer such beneficiary or mortgagee a reasonable opportunity to cure the default, including time to obtain
possession of the Premises by power of sale or judicial foreclosure, if such should prove necessary to effect a cure. 
 27.
Exhibits. All exhibits attached to this Lease shall be deemed to be incorporated herein by the individual reference to each such exhibit, and all such exhibits shall be deemed to be a part of this Lease as though set forth in full in the body
of the Lease. 
 28. Surrender of Lease Not Merger. The voluntary or other surrender of this Lease by Tenant, or a mutual
cancellation thereof, shall not work a merger and shall, at the option of Landlord, terminate all or any existing subleases or subtenants, or may, at the option of Landlord, operate as an assignment to Landlord of any or all such subleases or
subtenants. 
 29. Waiver. The waiver by a party hereto of any breach of any term, covenant or condition herein contained (or the
acceptance by a party of any performance by the other party after the time the same shall become due) shall not be deemed to be a waiver of such term, covenant or condition or any subsequent breach thereof or of any other term, covenant or condition
herein contained, unless otherwise expressly agreed to by such party in writing. The acceptance by Landlord of any sum less than that which is required to be paid by Tenant shall be deemed to have been received only on account of the obligation for
which it is paid (or for which it is allocated by Landlord, in Landlord’s reasonable discretion, if Tenant does not designate the obligation as to which the payment should be credited), and shall not be deemed an accord and satisfaction
notwithstanding any provisions to the contrary written on any check or contained in any letter of transmittal. The acceptance by Landlord of any sum tendered by a purported assignee or transferee of Tenant shall not be deemed a consent by Landlord
to any assignment or transfer of Tenant’s interest herein. No custom or practice which may arise between the parties hereto in the administration of the terms of this Lease shall be construed as a waiver or diminution of a party’s right to
demand performance by the other party in strict accordance with the terms of this Lease. 

  
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 30. General. 

30.1 Captions and Headings. The captions and paragraph headings used in this Lease are for convenience of reference only. They shall not
be construed to limit or extend the meaning of any part of this Lease, and shall not be deemed relevant in resolving any question of interpretation or construction of any paragraph of this Lease. 

30.2 Definitions. 
 (a)
Landlord. The term Landlord as used in this Lease, so far as the covenants or obligations on the part of Landlord are concerned, shall be limited to mean and include only the owner at the time in question of the fee title to the Premises. In
the event of any transfer(s) of such interest, so long as such transferee assumes in writing Landlord’s obligations under this Lease first accruing from and after the transfer, the Landlord herein named (and in case of any subsequent transfers
or conveyances, the then grantor) shall have no further liability under this Lease to Tenant except as to matters of liability which have accrued and are unsatisfied as of the date of such transfer, it being intended that the covenants and
obligations contained in this Lease on the part of Landlord shall be binding on Landlord and its successors and assigns only during and in respect of their respective periods of ownership of the fee; provided that any funds in the possession of
Landlord or the then grantor and as to which Tenant has an interest, less any deductions permitted by law or this Lease, shall be turned over to the grantee. The covenants and obligations contained in this Lease on the part of Landlord shall,
subject to the provisions of this Paragraph 30.2(a), be binding upon each Landlord and such Landlord’s heirs, personal representatives, successors and assigns only during its respective period of ownership. 

(b) Agents. For purposes of this Lease and without otherwise affecting the definition of the word “agent” or the meaning of
an “agency,” the term “agents” shall be deemed to include the agents and employees of Landlord or Tenant, as the case may be. 

(c) Interpretation of Terms. The words “Landlord” and “Tenant” as used herein shall include the plural as well as
the singular. Words in the neuter gender include the masculine and feminine and words in the masculine or feminine gender include the neuter. 

30.3 Counterparts; Facsimile Signatures. This Lease may be executed in any number of counterparts, each of which, when so executed and
delivered, shall be deemed an original, but all such counterparts taken together shall constitute only one instrument. Facsimile signatures and PDF format signatures sent by electronic mail shall be treated and have the same effect as original
signatures, and the parties agree to be bound thereby. 
 30.4 Time of Essence. Time is of the essence as to each and every provision
in this Lease requiring performance within a specified time. 
 30.5 Severability. In case any one or more of the provisions contained
herein shall for any reason be held to be invalid, illegal or unenforceable in any respect under applicable law, such invalidity, illegality or unenforceability shall not affect any other provision of this Lease, but this Lease shall be construed as
if such invalid, illegal or unenforceable provision had not been contained herein. In the event any provision of this Lease is invalid, illegal or unenforceable under applicable law, the parties shall use their respective best endeavors to negotiate
and agree a substitute provision which is valid, legal and enforceable and achieves to the greatest extent possible the economic, legal and commercial objectives of such illegal, void, invalid, illegal or unenforceable term, condition, stipulation,
provision, covenant or undertaking. In the event Tenant’s obligation to pay any Rentals hereunder is determined to be unenforceable, this Lease at the option of Landlord shall terminate. 

  
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 30.6 Governing Law. This Lease shall be construed and enforced in accordance with the laws
of the State of California. 
 30.7 Joint and Several Liability. If Tenant is more than one person or entity, each such person or
entity shall be jointly and severally liable for the obligations of Tenant hereunder. If Tenant is a husband and wife, the obligations hereunder shall extend to their sole and separate property as well as community property. 

30.8 Construction of Lease Provisions. Although the provisions of this Lease were prepared by Landlord, the doctrine or rule of
construction that ambiguities in this Lease shall be construed against the party drafting the same shall not be employed in connection with this Lease and this Lease shall be construed in accordance with the general tenor of the language to reach a
fair and equitable result. 
 30.9 Tenant’s Financial Statements. Prior to the date hereof, Tenant provided to
Landlord financial statements of Tenant dated as of December 31, 2017. Tenant represents and warrants that said financial statements are true, correct and complete in all material respects, as of the respective dates of and for the periods
referred to in such financial statements. Tenant acknowledges and agrees that Landlord is relying on such financial statements in accepting this Lease, and that a breach of Tenant’s warranty as to such financial statements shall constitute a
Default by Tenant. 
 31. Signs. Landlord shall install, or has installed, and shall maintain, an electronic directory in the
Building lobby. Such electronic directory shall include the name of Tenant. Landlord shall exercise commercially reasonable efforts to obtain approval from the City of San Jose for the construction or installation of (i) a monument sign on the
Land at a location to be determined by Landlord and reasonably acceptable to Tenant, and (ii) an illuminated pylon sign on a portion of the Land in a location to be determined by Landlord and reasonably acceptable to Tenant. If Landlord is
successful in obtaining approval of such monument sign, then Landlord, at Landlord’s expense (not chargeable to Tenant or the Improvement Allowance) shall install the monument sign structure and Tenant shall have the right, at its sole cost and
expense, to have the name or tradename of Tenant installed on a panel on such monument sign during the Term of this Lease. If Landlord is successful in obtaining approval of such illuminated pylon sign referred to above, then Landlord, at
Landlord’s expense (not chargeable to Tenant or the Improvement Allowance) shall install the pylon sign structure and Tenant shall have the right, at its sole cost and expense, to have the name or tradename of Tenant listed on such pylon sign.
In addition, Tenant shall have the right to Tenant identification signage in the lobby of the Premises, subject to the reasonable approval of Landlord and the approval of the City of San Jose. All of the signage referred to in clauses (i) and
(ii) above and in the immediately preceding sentences, including, without limitation, the location of such signage, shall be subject to the approval of the City of San Jose. Tenant also shall be allowed during the Term of this Lease, including,
without limitation, any extended or renewal term, subject to prior approval of the City of San Jose and satisfaction of all City of San Jose sign requirements, to install, at Tenant’s sole cost and expenses, rooftop signage on one side of the
Building in a location approved by the City of San Jose and reasonably approved by Landlord and Tenant. The design of all of Tenant’s signage will be subject to Landlord’s reasonable approval; Landlord hereby
pre-approves the design of the signage depicted in Exhibit I attached hereto and incorporated herein by this reference. Except as expressly permitted pursuant to the

  
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terms of this Paragraph 31, Tenant shall not place or permit to be placed any sign or decoration on the Land or on the exterior of the Building, without the prior written consent of Landlord,
which consent may be given or withheld by Landlord in its sole discretion. Tenant may place “for lease” signs in connection with efforts to assign or sublease the Premises, subject to the prior written consent of Landlord, which consent
shall not be unreasonably withheld or delayed; provided that all such signs shall be removed by Tenant, at Tenant’s cost, on or prior to Lease Termination. In no event shall any such sign revolve, rotate, move or create the illusion of
revolving, rotating or moving or be internally illuminated and there shall be no exterior spotlighting or other illumination on any such sign. Tenant, upon written notice by Landlord, shall immediately remove any of Tenant’s signs that are
visible from the exterior of the Building or Premises or signs and decorations that Tenant has placed or permitted to be placed on the Land or the exterior of the Building without the prior written consent of Landlord. If Tenant fails to so remove
such sign or decoration within five (5) business days after Landlord’s written notice, Landlord may enter upon the Premises, the Building and/or the Project, or applicable part thereof, and remove such sign or decoration and Tenant shall
pay Landlord, as Additional Rent within thirty (30) days after receipt of written demand, the cost of such removal. All signs placed on the Premises, Building or Land by Tenant shall comply with all recorded documents affecting the Premises,
Building or Land, as the case may be, including but not limited to any declaration of conditions, covenants and restrictions; and applicable statutes, ordinances, rules and regulations of governmental agencies having jurisdiction thereof. Tenant
shall at Lease Termination remove any sign which it has placed on the Premises, Land or the Building, and shall, at its sole cost, repair any damage caused by the installation or removal of such sign. 

32. Landlord as Party Defendant. If, by reason of any act or omission (where there is a duty to act) by Tenant or any Tenant Related
Parties, Landlord is made a party defendant concerning this Lease, or any portion of the Project, Tenant shall indemnify Landlord against all liability actually incurred by Landlord as a party defendant, including all damages, costs and reasonable
attorneys’ fees; provided, however, in no event shall Tenant’s indemnification obligation be construed as requiring Tenant to indemnify Landlord for any liability, including all damages, costs and reasonable attorneys’ fees, to the
extent caused by the negligence or willful misconduct of Landlord or its respective employees, contractors or agents. 
 33. Landlord Not
a Trustee. Landlord shall not be deemed to be a trustee of any funds paid to Landlord by Tenant (or held by Landlord for Tenant) pursuant to this Lease. Landlord shall not be required to keep any such funds separate from Landlord’s general
funds or segregated from any funds paid to Landlord by (or held by Landlord for) other tenants of the Building. Any funds held by Landlord pursuant to this Lease shall not bear interest. 

34. Interest. Any payment due from Tenant to Landlord shall bear interest from the date due until paid, at an annual rate equal to the
greater of: ten percent (10%); or five percent (5%) plus the rate established by the Federal Reserve Bank of San Francisco, as of the twenty-fifth (25th) day of the month immediately preceding the due date, on advances to member banks under Sections
13 and 13(a) of the Federal Reserve Act, as now in effect or hereafter from time to time amended, or the maximum rate permitted by law, whichever is less. In addition, Tenant shall pay all costs and reasonable attorneys’ fees incurred by
Landlord in the collection of such amounts. 
 35. Surrender of Premises. On the last day of the Lease Term or upon the sooner
termination of this Lease, Tenant shall, to the reasonable satisfaction of Landlord, surrender the Premises to Landlord in good order, condition and repair and otherwise in the condition that Tenant is required to maintain the same pursuant to the
express terms of this Lease, ordinary wear and tear, acts of God, casualty damage 

  
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(subject to the second sentence of Paragraph 15.3 above), condemnation, Specialty Alterations with respect to which Landlord has not reserved the right to require removal and Landlord’s
maintenance, repair, replacement and restoration obligations excepted. Tenant shall remove, or cause to be removed, all of Tenant’s personal property, furniture, furnishings and trade fixtures from the Premises, including, without limitation,
all voice and/or data transmission cabling, and all property not so removed shall be deemed abandoned by Tenant. Furthermore, Tenant shall immediately repair all damage to the Project caused by any such removal. If the Premises are not so
surrendered at Lease Termination, (i) Landlord may cause the removal and/or make any repairs, and the cost to Landlord shall be deemed Additional Rent payable by Tenant to Landlord within thirty (30) days after receipt of written demand
made by Landlord to Tenant, and (ii) if the Premises has not been so surrendered by the date that is sixty (60) days after Lease Termination, Tenant shall indemnify, defend and hold Landlord harmless from and against any loss, damage,
expense, claim or liability resulting from delay by Tenant in so surrendering the Premises including, without limitation, any claims made by any succeeding tenant or losses to Landlord due to lost opportunities to lease to succeeding tenants. The
provisions of this Paragraph 35 shall survive Lease Termination. 
 36. Labor Disputes. In the event Tenant shall in any manner be
involved in or be the object of a labor dispute which subjects the Premises or any part of the Project to any picketing, work stoppage or other concerted activity which in the reasonable opinion of Landlord is detrimental to the operation of the
Project or its tenants, Landlord shall have the right to require Tenant, at Tenant’s own expense and within a reasonable period of time, to use Tenant’s commercially reasonable good faith efforts to either resolve such labor dispute or
terminate or control any such picketing, work stoppage or other concerted activity to the extent necessary to eliminate any interference with the operation of the Project. To the extent such labor dispute interferes with the performance of
Landlord’s duties hereunder, Landlord shall be excused from the performance of such duties. Failure by Tenant to use its commercially reasonable good faith efforts to so resolve such dispute or terminate or control such picketing, work stoppage
or other concerted activity within a reasonable period of time shall constitute a default by Tenant hereunder, subject to applicable notice and cure periods. Nothing contained in this Paragraph 36 shall be construed as placing Landlord in an
employer/employee relationship with any of Tenant’s employees or with any other employees who may be involved in such labor dispute. 

37. No Partnership or Joint Venture. Nothing in this Lease shall be construed as creating a partnership or joint venture between
Landlord, Tenant, or any other party, or cause Landlord to be responsible for the debts or obligations of Tenant or any other party. 
 38.
Entire Agreement. Any agreements, warranties, or representations not expressly contained herein shall in no way bind either Landlord or Tenant, and Landlord and Tenant expressly waive all claims for damages by reason of any statement,
representation, warranty, promise or agreement, if any, not contained in this Lease. This Lease supersedes and cancels any and all previous negotiations, arrangements, brochures, agreements and understandings, whether written or oral, between
Landlord and its agents and Tenant and its agents with respect to the Project or this Lease. This Lease constitutes the entire agreement between the parties hereto and no addition to, or modification of, any term or provision of this Lease shall be
effective until and unless set forth in a written instrument signed by both Landlord and Tenant. 
 39. Submission of Lease.
Submission of this instrument for Tenant’s examination or execution does not constitute a reservation of space nor an option to lease. This instrument shall not be effective until executed and delivered by both Landlord and Tenant. 

  
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 40. Quiet Enjoyment. Landlord covenants and agrees with Tenant that upon Tenant paying
Rentals and performing its covenants and conditions under the Lease, Tenant shall and may peaceably and quietly have, hold and enjoy the Premises for the Lease Term, subject, however, to the terms of this Lease and any mortgages or deeds of trust
affecting the Premises, and the rights reserved by Landlord hereunder. 
 41. Authority. The undersigned parties hereby warrant that
they have proper authority and are empowered to execute this Lease on behalf of the Landlord and Tenant, respectively. If Tenant is a corporation, limited liability company or partnership, each individual executing this Lease on behalf of said
corporation, limited liability company or partnership represents and warrants that he is duly authorized to execute and deliver this Lease on behalf of said corporation in accordance with a duly adopted resolution of the Board of Directors of said
corporation or in accordance with the by-laws of said corporation, or on behalf of said limited liability company in accordance with a duly adopted resolution of the managing member or members of the limited
liability company, or on behalf of said partnership in accordance with the partnership agreement of such partnership, and that this Lease is binding upon said corporation, limited liability company or partnership, as the case may be, in accordance
with its terms. If Tenant is a corporation, and this Lease is not executed by two corporate officers, Tenant shall upon execution of this Lease, deliver to Landlord evidence of the authority of the individual executing this Lease on behalf of Tenant
to execute this Lease on behalf of Tenant. In the event Tenant should fail to deliver such evidence to Landlord upon execution of this Lease, Landlord shall not be deemed to have waived its right to require delivery of such evidence, and at any time
during the Lease Term Landlord may request Tenant to deliver the same, and Tenant agrees it shall thereafter promptly deliver such evidence to Landlord. If Tenant is a corporation, Tenant warrants that: (a) Tenant is a valid and existing
corporation; (b) Tenant is qualified to do business in California; (c) all fees and all franchise and corporate taxes are paid to date, and will be paid when due; (d) all required forms and reports will be filed when due; and
(e) the signers of this Lease are properly authorized to execute this Lease. 
 42. Brokerage Commissions. Each party hereto
represents and warrants to the other that it has not retained or worked with any broker or finder other than Newmark Cornish & Carey (“Newmark”), representing the Landlord, and Jones Lang LaSalle (“JLL”), representing
the Tenant, in connection with the negotiation of this Lease and/or the consummation of the transaction contemplated hereby. Landlord agrees to pay Newmark and JLL a brokerage commission in connection with this Lease pursuant to a separate agreement
between Landlord and Newmark. Landlord and Tenant do each hereby agree to indemnify, defend and hold the other harmless from and against liability for compensation or charges which may be claimed by any broker, finder or other similar party (other
than Newmark and JLL) by reason of any dealings or actions of the indemnifying party, including any costs, expenses and/or attorneys’ fees reasonably incurred with respect thereto. The obligation to indemnify, defend and hold harmless as set
forth in the immediately preceding sentence shall survive the termination of this Lease. 
 43. Roof Rights. Landlord hereby grants
to Tenant an exclusive license (the “License”) to install, maintain and operate on the roof of the Building antenna or satellite dish equipment not exceeding four hundred square feet of roof space (the “Antenna Equipment”) in
accordance with and subject to the terms and conditions set forth below. The Antenna Equipment shall be installed at a location(s) designated by Landlord and reasonably acceptable to Tenant (such location(s) as the same may be expanded from time to
time, being the “Licensed Area”). The Licensed Area shall be considered to be a part of the Premises for all purposes under the Lease, and except as otherwise expressly provided in this Paragraph all provisions applicable to the use of the
Premises under the Lease shall apply to the Licensed Area and its use by Tenant. 

  
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 (i) The Term of the License shall be coterminous with this Lease, as it may be extended or
renewed; 
 (ii) Tenant shall not be obligated to pay any license fee for the use of the Licensed Area pursuant to this Paragraph 43 during
the Term of this Lease, as the same may be extended or renewed. 
 (iii) Tenant shall use the Licensed Area only for the installation,
operation, repair, replacement and maintenance of the Antenna Equipment and the necessary mechanical and electrical equipment to service said Antenna Equipment, and for no other use or purpose. The installation of the Antenna Equipment, and all
equipment and facilities related thereto, including any required screening for the Antenna Equipment and any required conduit from the Premises to the Antenna Equipment, shall be deemed to constitute an Alteration subject to the provisions of
Paragraph 13 of this Lease, provided that Landlord shall not unreasonably withhold, condition or delay its approval of the same. Landlord may require appropriate screening for the Antenna Equipment as a condition of Landlord’s approval of the
installation of the Antenna Equipment in a particular location. Tenant may have access to the Licensed Area for such uses at all times upon reasonable prior notice to Landlord and shall reimburse Landlord for any reasonable out-of-pocket expenses incurred by Landlord in connection therewith; 

(iv) The Antenna Equipment shall be used only for transmitting and/or receiving data, audio and/or video signals to and from Tenant’s
facilities within the Premises for Tenant’s use, and shall not be used or permitted to be used by Tenant for purposes of broadcasting signals to the public or to provide telecommunications or other communications transmitting or receiving
services to any third parties; 
 (v) Landlord reserves the right upon reasonable prior written notice to Tenant to require the removal of
the Antenna Equipment should Landlord reasonably determine that its presence results in material damage to the Building unless Tenant makes satisfactory arrangements to protect Landlord therefrom; 

(vi) Tenant shall require its employees, when using the Licensed Area, to stay within the immediate vicinity thereof. In addition, in the event
any communications system or broadcast or receiving facilities are operating in the area, Tenant shall at all times during the term of the License conduct its operations so as to ensure that such system or facilities shall not be subjected to
harmful interference as a result of such operations by Tenant. Upon notification from Landlord of any such interference, Tenant agrees to promptly take the necessary steps to correct such situation, and Tenant’s failure to do so shall be deemed
a default under the terms of this Lease. 
 (vii) During the term of the License, Tenant shall comply with any standards promulgated by
applicable governmental authorities or otherwise reasonably established by Landlord regarding the generation of electromagnetic fields. Should Landlord determine in good faith at any time that the Antenna Equipment poses a health or safety hazard to
occupants of the Building, Landlord may require Tenant to make arrangements satisfactory to Landlord to mitigate such hazard or, if Tenant either fails or is unable to make such satisfactory arrangements, to remove the Antenna Equipment. Any claim
or liability resulting from the use of the Antenna Equipment or the Licensed Area shall be subject to the indemnification provisions of this Lease applicable to Tenant’s use of the Premises; 

  
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 (viii) During the term of the License, Tenant shall pay all taxes attributable to the Antenna
Equipment and other equipment owned and installed by Tenant, and Tenant shall assure and provide Landlord with reasonable evidence that the Licensed Area and Tenant’s use thereof are subject to the insurance coverages otherwise required to be
maintained by Tenant as to the Premises pursuant to Paragraph 8.2 above; 
 (ix) Upon the expiration or sooner termination of the Lease,
Tenant shall remove the Antenna Equipment and all related equipment and facilities, including any conduit from the Premises to the Antenna Equipment, from the Licensed Area and any other portions of the Building within or upon which the same may be
installed, and shall restore the Licensed Area and all other areas affected by such removal to their original condition, reasonable wear and tear, casualty, condemnation and Landlord’s maintenance, repair, replacement and restoration
obligations excepted, all at its sole cost and expense. 
 (x) Tenant’s rights under this Paragraph 43 belong solely to Bloom Energy
Corporation, a Delaware corporation, and to any Permitted Transferee to which this Lease is assigned or transferred, and any other attempted assignment or transfer of such rights shall be void and of no force and effect. 

44. Rules and Regulations. Tenant shall faithfully observe and comply, and cause all Tenant Related Parties and all persons claiming
any interest in the Premises a under or through Tenant to faithfully observe and comply, with the Rules and Regulations attached hereto as Exhibit J, and with all modifications and additions to such rules and regulations made by Landlord from
time to time (collectively, the “Rules and Regulations”). Landlord shall have the right to amend such Rules and Regulations from time to time with or without advance notice, as Landlord reasonably may deem appropriate for the best
interests of the occupants of the Building and other authorized users. In the event of any conflict between the Rules and Regulations and the terms of this Lease (including, without limitation, any Exhibits hereto), the terms of this Lease will
control. Any amendment(s) to the Rules and Regulations shall be effective as to Tenant, and binding on Tenant, upon delivery of a copy of such amendments to the Rules and Regulations to Tenant. Any failure by Tenant or any Tenant Related Parties to
observe and comply with the Rules and Regulations, as the same may be amended, shall be a default by Tenant, subject to applicable notice and cure periods. Landlord shall not be responsible for the nonperformance of the Rules and Regulations by any
tenants or occupants of the Building or other authorized users, nor shall Landlord be liable to Tenant by reason of the noncompliance with or violation of the Rules and Regulations by any other tenant or user or any of the Tenant Related Parties.
Notwithstanding anything to the contrary contained in this Lease, Tenant shall not be required to comply with any rule or regulation unless the same applies non-discriminatorily to all occupants of the
Project, and does not unreasonably interfere with Tenant’s use of the Premises or Tenant’s parking rights. 
 45. Security
System. Tenant hereby acknowledges that Landlord shall have no obligation to provide guard service or other security measures for the benefit of the Premises, the Building or the Project. Any such security measures for the benefit of the
Premises shall be provided by Tenant, at Tenant’s sole cost and expense. Tenant hereby assumes all responsibility for the protection of Tenant and its agents, employees, contractors, invitees and guests, and the property thereof, from acts of
third parties, including keeping doors locked and other means of entry to the Premises closed. Pursuant to all of the terms and conditions of Paragraphs 13 and 17 hereof, Landlord and Tenant acknowledge and agree that Tenant may, at Tenant’s
costs and expense, install and manage its own integrated security system in the Premises (the “Tenant Security System”); provided, however, that Tenant shall coordinate the installation and operation of any such Tenant Security System with
Landlord to assure that such Tenant Security System does not interfere with (i) any Landlord security system in place as of the Delivery Date, 

  
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and (ii) the building systems serving the Building and/or Premises and equipment, provided that to the extent Tenant’s Security System unreasonably interferes with any Landlord security
system, building systems and/or equipment, Tenant shall not be entitled to install, operate or manage the same and shall promptly remove it at Tenant’s sole cost and expense; provided further, however, the cost of such Tenant Security System
may be deducted from the undisbursed Improvement Allowance, pursuant to the terms of the Improvement Agreement attached hereto as Exhibit C. Tenant shall be solely responsible, at Tenant’s sole cost and expense, for the monitoring,
management and operation of Tenant’s Security System. Any Tenant Security System installed, or caused to be installed, in the Premises by Tenant shall, at Tenant’s sole cost and expense, be removed by Tenant at the expiration or earlier
termination of this Lease and Tenant shall repair or restore any damage to the Premises and/or Building resulting from such removal of Tenant’s Security System. 

46. Press Releases. Neither Landlord nor Tenant shall issue a press release concerning this Lease or the lease transaction referred to
herein without the prior written consent of the other party (which consent may be given or withheld in such other party’s sole and absolute discretion). 

47. Right of First Offer. Provided that no Default then exists under any provision of this Lease, either at the time of the delivery of
“Landlord’s Notice” (as hereafter defined) or at the time of the delivery of “Tenant’s Notice” (as hereinafter defined), Landlord hereby grants Tenant a continuing right (“First Right”) to lease 100% of any
space made available for lease by Landlord from time to time on the third floor of the Building (any such space being the “First Right Space”), in accordance with and subject to the provisions of this Paragraph 47. The First Right shall be
effective commencing on the Date of this Lease and shall cease to be effective during the final 12 months of the Term unless and until Tenant exercises its applicable extension option (to the extent available for exercise) set forth in Paragraph 3.4
above. Except as otherwise provided below, prior to leasing the First Right Space, or any portion thereof, to any other party during the period that this First Right is in effect, Landlord shall give Tenant written notice (the “Landlord’s
Notice”) of the basic economic terms including but not limited to the Base Rent, term, security deposit, and tenant improvement allowance (collectively, the “Economic Terms”), upon which Landlord is willing to lease such particular
First Right Space to Tenant or to a third party; provided that the Economic Terms shall exclude brokerage commissions and other Landlord payments that do not directly inure to the tenant’s benefit. Within five (5) business days after
Tenant’s receipt of Landlord’s Notice, Tenant must give Landlord written notice (the “Tenant’s Notice”) pursuant to which Tenant shall elect to (i) lease all, but not less than all, of that portion of the First Right
Space specified in Landlord’s notice (the “Designated Space”) upon such Economic Terms and the same non-Economic Terms as set forth in this Lease; (ii) refuse to lease the Designated Space,
specifying that such refusal is not based upon the Economic Terms, but upon Tenant’s lack of need for the Designated Space, in which event Landlord may lease the Designated Space upon terms no lower than 90%, on a “net effective”
basis, as the Economic Terms for the twelve (12) months elapsing immediately thereafter; or (iii) refuse to lease the Designated Space, specifying that such refusal is based upon said Economic Terms, in which event Tenant shall also
specify revised Economic Terms upon which Tenant shall be willing to lease the Designated Space. In the event that Tenant does not so respond in writing to Landlord’s Notice within said period, Tenant shall be deemed to have elected clause
(ii) above. In the event Tenant’s Notice elects clause (iii) above, Landlord may elect to either (x) lease the Designated Space to Tenant upon such revised Economic Terms and the same other
non-Economic Terms as set forth in this Lease, or (y) lease the Designated Space to any third party during the twelve (12) months elapsing immediately thereafter upon Economic Terms which are
materially less favorable to such party (i.e. materially more favorable to Landlord) than those Economic Terms proposed by Tenant. Should Landlord so elect to lease the Designated Space to Tenant, then Landlord shall promptly prepare and deliver to
Tenant an amendment to this Lease consistent with the foregoing, and Landlord and Tenant 

  
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shall execute and deliver within ten (10) business days after Tenant’s receipt thereof from Landlord. In the event that Landlord leases any specific First Right Space in question, or
any portion thereof, to a third party in accordance with the provisions of this Paragraph, and during the effective period of this First Right the First Right Space, or any portion thereof, shall again become available for reletting, then prior to
Landlord entering into any such new lease with a third party for the First Right Space in question (or portion thereof), Landlord shall repeat the procedures specified above in this Paragraph. Notwithstanding the foregoing, it is understood that
Tenant’s First Right shall be subject only to those extension or expansion rights contained in leases granted by Landlord prior to the Date of this Lease to any third party tenant in the Project, as well as any renewal or extension rights
expressly granted to any third party tenant in its lease or created by negotiation and agreement with Landlord prior to the expiration of its lease term. Tenant’s rights under this Paragraph 47 shall belong solely to Bloom Energy Corporation, a
Delaware corporation, and to any Permitted Transferee to which this Lease is assigned or transferred, and any other attempted assignment or transfer of such rights shall be void and of no force and effect. Anything herein to the contrary
notwithstanding, prior to Tenant accepting any First Right offer with respect to the First Right Space, or applicable part thereof, Landlord may, but shall not be obligated to, at Landlord’s election in its sole and absolute discretion and
without the consent of Tenant, construct, or cause to be constructed, market rate improvements to the First Right Space, or applicable part thereof and if Landlord constructs, or causes to be constructed, such market rate improvements to the First
Right Space, or applicable part thereof, Landlord shall not be obligated to remove the same if Tenant exercises its First Right with respect to such First Right Space, or applicable part thereof. 

Upon the lease of such First Right Space, or applicable portion thereof, to a third party, Tenant shall execute and deliver to Landlord and/or
such prospective third party tenant, any and all documents and instruments reasonably requested by Landlord and/or such third party tenant evidencing Tenant’s waiver of its right to lease such available First Right Space until the expiration or
earlier termination of the third party tenant’s lease of the First Offer Space (as such third party tenant’s lease of the First Offer Space may be renewed or extended by such third party tenant by exercise of an express option granted to
such third party tenant or by negotiation and agreement with Landlord during such third party tenant’s lease term). If Tenant refuses to comply with the provisions of the immediately preceding sentence within five (5) business days after
Tenant’s receipt of written request by Landlord, then it shall constitute a default by Tenant under this Lease, subject to applicable notice and cure periods. 

Anything in this Paragraph 47 to the contrary notwithstanding, Landlord shall have no obligation to offer to lease available First Right Space
to Tenant pursuant to the terms of this Paragraph 47 and Tenant shall have no rights under this Paragraph 47 if Tenant is in default under this Lease beyond any applicable cure or grace period at the time that Landlord otherwise would be required to
offer the First Offer Space to Tenant, and if Landlord enters into a lease of such available First Right Space, or applicable portion thereof, with a third party during such period of Tenant’s uncured default, the tenant under such lease shall
take possession of such available First Right Space, or applicable portion thereof, free and clear of Tenant’s rights under this Paragraph 47. 

48. Bloom Boxes. Landlord grants Tenant, subject to all applicable Laws, the right to (A) install, at Tenant’s sole cost and
expense, at any time during the Term of this Lease, as the same may be extended, Tenant’s proprietary “Bloom Boxes” in a location outside of the Building in an area to be approved by Landlord, which approval shall not be unreasonably
withheld, conditioned or delayed (individually and collectively, the “Bloom Boxes”) and (B) if installed, thereafter operate such Bloom Boxes from such installation area(s) for the entire balance of the Term (as the same may be
extended), without the obligation to pay Landlord any additional rent, fee or any other monetary sums in consideration of the right to install such Bloom Boxes in a location(s) outside of the Building as provided

  
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above. Promptly following the date the area in which the Bloom Boxes will be located has been determined and approved by Landlord, which approval shall not be unreasonably withheld, conditioned
or delayed, Landlord and Tenant shall identify the same on a site plan and attach such site plan to this Lease as Exhibit K. Tenant’s right to install Bloom Boxes outside of the Building pursuant to the terms of this Paragraph 48 shall
be subject to the approval of the City of San Jose, if such approval is required. In no event shall such Bloom Boxes (individually or stacked upon one another) be greater than ten feet (10’) high. The plans and specifications for the Bloom
Boxes and their installation shall be subject to Landlord’s prior approval, which shall not be unreasonably withheld, conditioned or delayed, and Landlord may condition same upon the construction by Tenant of an enclosure reasonably acceptable
to Landlord to screen the Bloom Boxes. All work shall be performed by a contractor reasonably approved by Landlord and in accordance with Landlord’s construction rules and insurance requirements. The Bloom Boxes shall be deemed to be a part of
the Premises for purposes of the indemnification and insurance provisions of this Lease. Repair and maintenance of the Bloom Boxes shall be the sole responsibility of Tenant. At Landlord’s option, Landlord may require that Tenant remove the
Bloom Boxes and all related facilities upon the expiration or earlier termination of the Term and repair all damage to the Building or Common Area resulting from the installation or removal of the Bloom Boxes, reasonable wear and tear, casualty,
condemnation and Landlord’s maintenance, repair, replacement and restoration obligations excepted, at Tenant’s sole cost and expense. 

49. Generator(s). Landlord grants to Tenant, subject to all applicable Laws, the right to (A) install, at Tenant’s sole cost
and expense, at any time during the Term of this Lease, as the same may be extended, a generator(s) that may be required to meet its operational needs in a location outside of the Building in the area to be approved by Landlord, which approval shall
not be unreasonably withheld, conditioned or delayed, together with supplemental fuel or power lines and related connections to the Building in a location outside of the Building in the area to be approved by Landlord, which approval shall not be
unreasonably withheld, conditioned or delayed (individually and collectively, the “Generator”) and (B) if installed, thereafter operate such Generator from such area(s) of the Common Area for the entire balance of the Term (as the
same may be extended), without the obligation to pay Landlord any additional rent, fee or similar amounts in consideration of the right to install such Generator in a location(s) outside of the Building as provided above. Promptly following the date
the area in which the generator(s) will be located has been determined and approved by Landlord, which approval shall not be unreasonably withheld, conditioned or delayed, Landlord and Tenant shall identify the same on a site plan and attach such
site plan to this Lease as Exhibit L. Promptly following the date the area in which the supplemental fuel or power lines and related connections to the Building will be located has been determined and approved by Landlord, which approval
shall not be unreasonably withheld, conditioned or delayed, Landlord and Tenant shall identify the same on a site plan and attach such site plan to this Lease as Exhibit L-1. Tenant’s right to
install the Generator outside of the Building pursuant to the terms of this Paragraph 49 shall be subject to the approval of the City of San Jose, if such approval is required. Any fuel container used in connection with the Generator must be
maintained by Tenant above-ground and in compliance with all applicable legal requirements. The plans and specifications for the Generator and its installation shall be subject to Landlord’s prior approval, which shall not be unreasonably
withheld, conditioned or delayed, and Landlord may condition same upon the construction by Tenant of an enclosure reasonably acceptable to Landlord to screen the Generator. All work shall be performed by a contractor reasonably approved by Landlord
and in accordance with Landlord’s construction rules and insurance requirements. The Generator shall be deemed to be a part of the Premises for purposes of the indemnification and insurance provisions of this Lease. Repair and maintenance of
the Generator shall be the sole responsibility of Tenant. At Landlord’s option, Landlord may require that Tenant remove the Generator and all related facilities upon the expiration or earlier termination of the Term and repair all damage to the
Building or Common Area resulting from the installation or removal of the Generator, reasonable wear and tear, casualty, condemnation and Landlord’s maintenance, repair, replacement and restoration obligations excepted, at Tenant’s sole
cost and expense. 

  
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 50. Contraction Right. Provided that no Default by Tenant then exists under any provision
of this Lease, either at the time of Tenant’s election of its right to terminate granted herein or as of the effective Termination Date, Tenant (i.e. Bloom Energy Corporation) and any Permitted Transferee shall have the one-time right to terminate this Lease (the “Early Termination Right”) solely as to the entire fourth (4th) floor of the Building or the entire sixth (6th) floor of the Building, as the case may be (the “Relinquished Floor”) effective as of the last day of the seventh (7th) year of the
initial Term of the Lease (the “Termination Date”), provided Tenant has delivered its irrevocable written notice of such election to terminate (the “Termination Notice”) to Landlord not more than twelve (12) full calendar
months prior to the Termination Date or less than nine (9) full calendar months prior to the Termination Date. Such Termination Notice shall state whether the Relinquished Floor is the entire fourth (4th) floor of the Building or the entire sixth (6th) floor of the Building. All rental and other costs due under this Lease allocable to the
Relinquished Floor through the Termination Date shall remain due and payable by Tenant to Landlord. Any such termination by Tenant shall not abrogate any obligation existing under the Lease as of the Termination Date or otherwise attributable to
Tenant’s occupancy thereof. Anything herein to the contrary notwithstanding, Tenant’s right to terminate this Lease as to the entire fourth (4th) floor of the Building or the entire
sixth (6th) floor of the Building is personal to Bloom Energy Corporation and any Permitted Transferee, and shall not apply to any other assignee of this Lease. Tenant shall not have a right to
terminate this Lease as to the entire fourth (4th) floor of the Building or the entire sixth (6th) floor of the Building if this Lease has been assigned (whether or not Landlord has consented to such assignment). Any exercise of such termination
right referred to in this Paragraph 50 by any assignee of this Lease shall be void and of no force or effect. 
 If Tenant timely exercises
the Early Termination Right, then Landlord shall prepare, and Landlord and Tenant shall execute, an amendment to this Lease that memorializes the contraction of the size of the Premises by the amount of the Relinquished Floor and subjects the
Premises less the Relinquished Floor to all of the terms and conditions of this Lease, except that effective as of the Termination Date: (i) the Base Rent payable by Tenant to Landlord for the Premises as shown in the schedule set forth in
Paragraph 1.10 shall be decreased from and after the Termination Date (on a per rentable square foot basis) to account for the rentable square footage of the Relinquished Floor, (ii) Tenant’s percentage share shall be decreased to a
percentage determined by dividing the rentable square footage of the Premises (not including the Relinquished Floor) by the rentable square footage of the Building (stipulated in Paragraph 1.5 above), and (iv) the number of unreserved parking
spaces within the Common Area allocated to Tenant shall be decreased by an amount equal 3.3 parking spaces per 1,000 rentable square feet included in the Relinquished Floor. 

51. OFAC. Tenant represents, warrants and covenants that Tenant (i) is not listed on the Specially Designated Nationals and
Blocked Persons List maintained by the Office of Foreign Asset Control, Department of the Treasury (“OFAC”) pursuant to Executive Order No. 13224, 66 Fed. Reg. 49079 (Sept. 25, 2001)(“Order”)and all applicable provisions of
Title III of the USA Patriot Act (Public Law No. 107-56 (October 26, 2001)); (ii) is not listed on the Denied Persons List and Entity List maintained by the United States Department of Commerce;
(iii) is not listed on the List of Terrorists and List of Disbarred Parties maintained by the United States Department of State, (iv) is not listed on any list or qualification of “Designated Nationals” as defined in the Cuban
Assets Control Regulations 31 C.F.R. Part 515; (v) is not listed on any other publicly available list of terrorists, terrorist organizations or narcotics traffickers maintained by the United States Department of State, the United States Department

  
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of Commerce or any other governmental authority or pursuant to the Order, the rules and regulations of OFAC (including without limitation the Trading with the Enemy Act, 50 U.S.C. App. 1-44; the International Emergency Economic Powers Act, 50 U.S.C. §§ 1701-06; the unrepealed provision of the Iraq Sanctions Act, Publ.L. No. 101-513; the United Nations Participation Act, 22 U.S.C. § 2349 aa-9; The Cuban Democracy Act, 22 U.S.C. §§ 60-01-10; The Cuban Liberty and Democratic Solidarity Act, 18.U.S.C. §§ 2332d and 233; and The Foreign Narcotic Kingpin Designation Act, Publ. L.
No. 106-120 and 107-108, all as may be amended from time to time); or any other applicable requirements contained in any enabling legislation or other Executive
Orders in respect of the Order (the Order and such other rules, regulations, legislation or orders are collectively called the “Orders”); (vi) is not engaged in activities prohibited in the Orders; or (vii) has not been convicted,
pleaded nolo contendere, indicted, arraigned or custodial detained on charges involving money laundering or predicate crimes to money laundering, drug trafficking, terrorist-related activities or other money laundering predicate crimes or in
connection with the Bank Secrecy Act (31 U.S.C. §§ 5311 et. seq.). 
 [balance of page is intentionally blank; signature page
follows on next page] 

  
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 IN WITNESS WHEREOF, the parties have executed this Lease as of the date set forth below. 

 

			
	LANDLORD:
	
	 237 NORTH FIRST STREET HOLDINGS, LLC,

a Delaware limited liability company

		
	By:	 	 /s/ Donald H. Kuemmeler

	Name:	 	 Donald H. Kuemmeler

	Title:	 	 Authorized Signatory

	
	Dated: April 9, 2018
	
	TENANT:
	
	 BLOOM ENERGY CORPORATION,
 a
Delaware corporation

		
	By:	 	 /s/ Shawn Soderberg

	Name:	 	 Shawn Soderberg

	Title:	 	 EVP, Legal Counsel & Secretary

		
	By:	 	  

	Name:	 	  

	Title:	 	  

		
	Dated:	 	April 6, 2018

  
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 EXHIBITS 
  

					
			
	A-1	  	First Floor Floor Plan	  	Paragraph 1.4 (First Floor Premises shown cross-hatched or otherwise identified)
			
	A-2	  	Fourth Floor Floor Plan	  	Paragraph 1.4 (Fourth Floor Premises shown cross-hatched or otherwise identified)
			
	A-3	  	Fifth Floor Floor Plan	  	Paragraph 1.4 (Fifth Floor Premises shown cross-hatched or otherwise identified)
			
	A-4	  	Sixth Floor Floor Plan	  	Paragraph 1.4 (Sixth Floor Premises shown cross-hatched or otherwise identified)
			
	B	  	Site Plan	  	Paragraph 1.5 (Building shown cross-hatched or otherwise identified and the Land to be shown thereon pursuant to Paragraph 2.1)
			
	C	  	Improvement Agreement	  	Paragraph 2.2
			
		  	Schedule C-1—Base Building Condition	  	
			
	D	  	Commencement Date Letter	  	Paragraph 3.2
			
	E	  	Site Plan Showing Location of Retail Building	  	Paragraph 2.1(d)
			
	F	  	Legal Description of Land	  	Paragraph 2.1(a)
			
	F-1	  	Assessor’s Parcel Map	  	Paragraph 2.1(a)
			
	F-2	  	Parcel Map	  	Paragraph 2.1(a)
			
	G	  	Restricted Common Area	  	Paragraph 11.1
			
	H	  	Environmental Reports	  	Paragraph 6.4
			
	I	  	Pre-Approved Signage Design	  	Paragraph 31
			
	J	  	Rules and Regulations	  	Paragraph 47
			
	K	  	Site Plan Showing Location of Bloom Boxes	  	Paragraph 48
			
	L	  	Site Plan Showing Location of Generator	  	Paragraph 49
			
	L-1	  	Site Plan Showing Location of Fuel or Power Lines	  	Paragraph 49

  
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 EXHIBIT A-1 

FIRST FLOOR FLOOR PLAN 
 [see
attached] 

  
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 EXHIBIT A-2 

FOURTH FLOOR FLOOR PLAN 
 [see
attached] 

  
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 EXHIBIT A-3 

FIFTH FLOOR FLOOR PLAN 
 [see
attached] 

  
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 EXHIBIT A-4 

SIXTH FLOOR FLOOR PLAN 
 [see
attached] 

  
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 EXHIBIT B 

SITE PLAN IDENTIFYING BUILDING AND LAND (AND PARCEL B BUILDING) 

[see attached] 

  
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 EXHIBIT B 

SITE PLAN 
  

 

  
 -1- 

 EXHIBIT C 

IMPROVEMENT AGREEMENT 
 This
Improvement Agreement (the “Improvement Agreement”) is hereby made a part of that certain Net Lease Agreement (the “Lease”) dated as of April 4, 2018, and made and entered into by and between 237 NORTH FIRST STREET HOLDINGS,
LLC, a Delaware limited liability company, as Landlord, and BLOOM ENERGY CORPORATION, a Delaware limited liability company, as Tenant. Except as otherwise defined herein, all capitalized terms used herein shall have the meanings as are ascribed
thereto in the Lease or in the exhibits attached thereto. The following provisions are incorporated in and made a part of the Lease: 
 1.
(a) Base Building Condition. Landlord hereby informs Tenant that, to Landlord’s current, actual knowledge that (i) prior to the Delivery Date, the construction of the Building by Landlord was completed in substantial conformity with
Schedule C-1 attached hereto and incorporated herein by this reference, (ii) all governmental permits have been issued to Landlord with respect to the Base Building that are necessary for Tenant to
commence construction of the Initial Improvements (defined below), and (iii) the Building is, as of the Delivery Date, in compliance with all applicable law and free from Hazardous Materials in violation of applicable environmental laws.
Notwithstanding anything to the contrary contained herein or in the Lease, if Tenant is unable to obtain any permit required in connection with its construction of the Initial Improvements as a result of any defect in the Base Building existing as
of the Delivery Date or failure of the Base Building as of the Delivery Date to comply with all applicable law, Tenant shall immediately notify Landlord of the same in writing (“Tenant’s Correction Notice”) and Landlord shall, as
Tenant’s sole and exclusive remedy for such defect or failure, correct any such defect or failure to comply at Landlord’s sole cost and expense, and if Landlord’s performance of work necessary to correct such defect or failure is the
sole reason that the Initial Improvements have not been substantially completed by January 1, 2019, then the January 1, 2019 date referred to in clause (i) of Paragraph 1.8 of the Lease and the commencement of the Abatement Period
shall be delayed one day for each day that Landlord’s performance of work necessary to correct any such defect or failure to comply as provided above is the sole cause of delay in the substantial completion by Tenant of the Initial
Improvements. For purposes of this Lease, the Base Building condition shall be the condition described in Schedule C-1 attached hereto. 

(b) Initial Improvements. Subject to the terms and conditions set forth herein and subject to the provisions of Paragraph 13 and 17 of
the Lease, Tenant shall have the right to construct or install initial, interior leasehold improvements in the Premises (“Initial Improvements”). 

2. Initial Improvement Plans. The Initial Improvements shall be constructed, or caused to be constructed, by Tenant pursuant to working
drawings and specifications (“Final Plans”) prepared or caused to be prepared by Tenant, at Tenant’s sole cost, and approved by Landlord (which approval shall not be unreasonably withheld, conditioned or delayed). Such Final Plans
shall be logically consistent with and a natural evolution of the initial test fit plan provided by Landlord to Tenant on November 4, 2017. If the Final Plans show work requiring a modification or change to the shell of the Building or the
Building Systems, Landlord shall not be deemed unreasonable if it disapproves such Final Plans due to such modifications or changes or if it conditions its consent to such Final Plans upon Tenant paying to Landlord, prior to the commencement of
construction of the Initial Improvements, the full cost of modifying or changing the Building shell or the Building Systems as required by such Final Plans; provided, however, Landlord acknowledges that the installation of plumbing, electrical and
mechanical facilities that exclusively serve and affect only the Premises, such as the distribution of HVAC (such as 

  
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through the installation of duct work) and electrical service (such as running wires from the panel) within and affecting only the Premises, shall not be deemed to be modifications or changes to
the Building Systems under the foregoing. Landlord shall advise in writing Tenant of its approval of Tenant’s proposed Final Plans or if Landlord disapproves the proposed Final Plans, Landlord shall notify Tenant of Landlord’s objections
in reasonable detail (and suggestions for corrections to such Final Plans so that they will meet with Landlord’s approval) within ten (10) business days after receipt thereof. If Landlord disapproves the Final Plans, the parties shall
confer and negotiate in good faith to reach agreement on such disapproved items and Tenant shall deliver, or cause its architect to deliver to Landlord, revised, proposed Final Plans, which respond to Landlord’s requests for changes. Landlord
shall advise Tenant within five (5) business days after receipt of any revised, proposed Final Plans of its approval or disapproval thereof, and, if Landlord does not approve any of the revised, proposed Final Plans, advise Tenant of the
changes required in the same so that they will meet Landlord’s approval. This iterative process shall continue until Landlord and Tenant mutually agree upon the Final Plans for the Initial Improvements. As soon as Landlord and Tenant agree upon
the Final Plans, a representative of Landlord and Tenant each shall sign the same. Tenant shall not commence construction or installation of any Initial Improvements until Landlord has approved the Final Plans. Approval of the Final Plans by
Landlord shall not constitute a representation or warranty that the Initial Improvements if constructed in accordance with such approved Final Plans will comply with applicable Laws. Anything herein to the contrary, Landlord shall have the right to
approve the window coverings or window shades for the exterior windows of the Premises; it being understood that such window coverings or window shades for the exterior windows of the Building and of the Parcel B Building are to be uniform. 

To the extent any of the Initial Improvements include “design build” work that is not contemplated to be identified on the Final
Plans, Tenant agrees that it shall not construct or install such design build improvements or design build work in the Premises until Landlord has approved the same in writing (such approval not to be unreasonably withheld, conditioned or delayed).
All design build elements constructed or installed by Tenant shall be constructed or installed in accordance with the design or plans approved in writing by Landlord, pursuant to the iterative process for the Final Plans set forth in the preceding
grammatical paragraph. If any portion of the Initial Improvements is intended to be constructed or installed by Tenant on a design build basis, then Tenant agrees to notify Landlord of such intention prior to finalizing the Final Plans. To the
extent Landlord reasonably determines that the design build elements of the Initial Improvements are a critical or significant portion of the Initial Improvements, Landlord reserves the right, notwithstanding anything in this Agreement to the
contrary, to require Tenant to prepare final plans for such design build elements for Landlord’s written approval (pursuant to the iterative process for the Final Plans set forth in the preceding grammatical paragraph) prior to Tenant
commencing construction or installation of such design build elements. 
 Promptly following completion of the Initial Improvements (or
earlier termination of the Lease, if applicable), Tenant agrees to furnish to Landlord, at no cost to Landlord, a copy of the Final Plans and any and all “as built” plans and design build plans received by or prepared for Tenant with
respect to the Initial Improvements. 
 3. Construction of Initial Improvements. In connection with the construction of the Initial
Improvements, Tenant shall cause its contractors and subcontractors to carry insurance as provided in Paragraph 8 below. Tenant’s contractors and subcontractors performing any Initial Improvement work shall be licensed in California. Tenant
shall be responsible for obtaining all necessary permits and approvals required for the construction and installation of the Initial Improvements. Following Landlord’s approval of the Final Plans, and after Tenant has obtained all necessary
permits and approvals required for the construction and installation of the Initial Improvements, Tenant may promptly commence construction and installation of the Initial Improvements and shall thereafter pursue the same

  
 -2- 

 
diligently to completion. Any damage to the Building caused by Tenant or its contractors or subcontractors in connection with the construction of the Initial Improvements shall be repaired at
Tenant’s expense. All work done in connection with the Initial Improvements shall be performed in compliance with all applicable laws, ordinances, rules, orders and regulations of all federal, state, county and municipal governments or agencies
now in force or that may be enacted hereafter and with all directives rules and regulations of the fire marshal, health officer, building inspector or other proper officers of any governmental agency now having or hereafter acquiring jurisdiction.
Tenant agrees to comply, at no cost to Landlord, with any reasonable recommendations made by Landlord to minimize any negative impact construction or installation of the Initial Improvements may have on other tenants or occupants of the Building or
Project or on the Building or Project. Tenant will manage the construction of the Initial Improvements and no construction management or supervision fee shall be paid by Tenant to Landlord in connection with the construction of the Initial
Improvements. Tenant shall have the right to use consultants and contractors selected by Tenant and approved by Landlord (which approval shall not be unreasonably withheld, conditioned or delayed) in connection with the construction of the Initial
Improvements. Tenant hereby discloses to Landlord that Tenant’s general contractor for the performance of the Initial Improvements shall be McClarney Construction and Landlord approves McClarney Construction as Tenant’s general contractor.

 Promptly following completion of the Initial Improvements (or earlier termination of the Lease, if applicable), Tenant agrees to furnish
to Landlord, at no cost to Landlord, a copy of all permits and approvals obtained by Tenant with respect to the construction or installation of the Initial Improvements. 

4 Changes. There shall be no changes to the approved Final Plans without the prior written consent of Landlord, which consent shall not
be unreasonably withheld, conditioned or delayed. All change orders requested by Tenant shall be made in writing, shall specify the amount of delay or the time saved as a result of such change order, and any added or reduced cost resulting
therefrom. Any change not approved or disapproved by Landlord within ten (10) business days of Landlord’s receipt of detailed plans and specifications therefor shall be deemed disapproved. The process for submission of revisions to the
Final Plans shall follow the same iterative process set forth above in Paragraph 2 for the approval of the Final Plans. 
 5.
Inspections. Landlord shall have the right to enter onto the Premises for the purpose of posting a notice(s) of nonresponsibility with respect to the construction of the Initial Improvements. Tenant agrees to give Landlord five
(5) business days’ notice in writing prior to the date Tenant will commence construction of the Initial Improvements to allow Landlord sufficient time to post such notice(s) of nonresponsibility. In addition, Landlord, its members,
manager, partners, officers, agents, representatives or employees, shall have the right at all reasonable times to enter upon the Premises and inspect the Initial Improvements to determine that the same are in conformity with the Final Plans and all
requirements hereof. Landlord, however, is under no obligation to supervise, inspect or inform Tenant of the progress of construction and Tenant shall not rely upon Landlord therefor. 

6. Allowances. 
 (a)
Improvement Allowance. Tenant shall bear all of its costs of constructing the Initial Improvements, except that Landlord shall provide a construction allowance (the “Improvement Allowance”) to be applied to such costs in the amount
of Ten Million Three Hundred Seventy-four Thousand Two Hundred and 00/100 Dollars ($10,374,200.00) (being $100 per rentable square foot time the rentable square footage of the floor area of the Premises set forth in Paragraph 1.4 of the Lease). The
costs of such construction shall include, without limitation, engineering, space planning and architectural fees and costs incurred by Tenant for preparation of the proposed Final Plans and all working drawings

  
 -3- 

 
and processing of applications for all governmental authorizations, approvals, licenses and permits; costs of obtaining building permits; fees of engineers, space planners, architects, attorneys
and others providing professional or extra services to Tenant in connection with the construction of the Initial Improvements or the supervision of the construction; costs of Tenant identification signage; all hard construction costs incurred by
Tenant for the construction of the Initial Improvements according to the Final Plans and all approved changes thereto, including, but not limited to, all labor and supervision costs, costs of all materials and supplies used in such construction,
contract price for all construction work undertaken by general contractors and subcontractors, and fees, taxes or other charges levied by governmental or quasi-governmental agencies (including, public utilities) in connection with the issuance of
all approvals, licenses and permits obtained by Tenant necessary to undertake construction of the Initial Improvements; and Tenant’s general contractor’s overhead and profit. There shall be no construction management fee charged by
Landlord in its review of the proposed Final Plans or in connection with the construction of the Initial Improvements. If performance or payment bonds are required by Landlord or Tenant, the party requiring such bonds shall be responsible for paying
for the cost of same. If, after completing the Initial Improvements in accordance with the Final Plans, the entire Improvement Allowance has not been applied by Landlord to the costs of completing such Initial Improvements, then such unapplied and
undisbursed portion of the Improvement Allowance shall remain the property of Landlord (and Tenant shall not be entitled to receive any portion of the same) and Tenant shall not be entitled to any further reduction or offset in the payment of
monthly Base Rent or any Additional Rent under the Lease. 
 (b) Additional Improvement Allowance. If requested by Tenant in writing
by written notice given to Landlord prior to the date Landlord commences or causes to be commenced the construction of the Initial Improvements, Landlord shall contribute pursuant to the terms below up to an additional Two Million Seventy-four
Thousand Eight Hundred Forty and 00/100 Dollars ($2,074,840.00) (the “Additional Improvement Allowance”) toward the costs of construction of the Initial Improvements (as described in Paragraph 6(a) above) and, in such event,
(i) Landlord shall amortize that portion of the Additional Allowance disbursed by Landlord pursuant to the terms below at a rate of $0.012 per rentable square feet of the Premises per month for each dollar of the Additional Improvement
Allowance disbursed by Landlord to Tenant and the monthly Base Rent to be paid by Tenant under this Lease during each month of the initial Term of this Lease as set forth in the schedule included in Paragraph 1.10 of this Lease shall be increased by
such monthly amortized amount, and (ii) Landlord and Tenant shall each then execute an amendment to this Lease, within five (5) days following the date the same is presented to Tenant for execution by Landlord, reflecting the increased
monthly Base Rent resulting from this amortization. For avoidance of doubt, the annual three percent (3%) increases in monthly Base Rent pursuant to Paragraph 1.10 of the Lease shall not be applicable to the component of monthly Base Rent resulting
from the amortization of the Additional Improvement Allowance provided to Tenant pursuant to this Paragraph 6(b). Any costs of construction of the Initial Improvements (as described in Paragraph 6(a) above in excess of the Improvement Allowance (and
the Additional Improvement Allowance, if applicable), shall be paid by Tenant (and Landlord shall have no responsibility or liability for such excess costs). 

(c) Conditions to Disbursement of Improvement Allowance. Landlord shall not be obligated to make any disbursement of the Improvement
Allowance (or Additional Improvement Allowance, if applicable) to or for the benefit of Tenant unless at the time of such request for disbursement, all of the following conditions are satisfied: 

(i) Such request shall be made prior to the date that is twelve (12) months following the Commencement Date; 

  
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 (ii) There shall exist no condition, event or act which would constitute a breach or default by
Tenant hereunder or under the Lease; 
 (iii) The Lease shall be in full force and effect; 

(iv) Tenant shall have furnished to Landlord receipted bills and releases of lien rights (in form and content reasonably satisfactory to
Landlord) covering work done and/or materials furnished in connection with the construction of the Initial Improvements (it being understood that Tenant shall furnish Landlord with conditional lien releases as to the work done and materials
furnished for which Tenant’s application for disbursement from the Improvement Allowance applies and unconditional lien releases as to work and materials furnished for which the immediately prior disbursement application has been paid). 

(c) Distribution. Provided each of the conditions set forth in subparagraph 6(b) above is satisfied, Tenant may request disbursements
from the Improvement Allowance not more frequently than once each month to pay for the reasonable costs of constructing the Initial Improvements (however, all costs of constructing the Initial Improvements in excess of the Improvement Allowance
shall be borne solely by Tenant). No disbursements shall be made until Landlord has approved the Final Plans. Each disbursement request may seek disbursement of that portion of the Improvement Allowance in an amount equal to the proportion of the
Initial Improvements completed and covered by the disbursement request, multiplied by a fraction, the numerator of which is the Improvement Allowance and the denominator of which is the total contract price for the Initial Improvements (Tenant
agrees to provide Landlord with such contract price, and any evidence substantiating the same as Landlord may reasonably request, prior to Tenant making any disbursement requests hereunder). Each request for disbursement shall be accompanied by
(i) an itemized statement, in form and content reasonably acceptable to Landlord; (ii) lien releases, in a form and content reasonably satisfactory to Landlord, from all persons and entities providing work or materials covered by such
statement; and (iii) invoices, vouchers, statements, affidavits and/or other documents in a form reasonably acceptable to Landlord which substantiate and justify the disbursement requested. Within fifteen (15) days after Landlord’s
receipt of each fully completed disbursement request, Landlord shall pay ninety percent (90%) of the amount requested therein directly to Tenant or, at Landlord’s option, directly to contractors, contractors, laborers or suppliers entitled
thereto; provided, however, Landlord reserves the right to subsequently disapprove some or all of the matters disclosed by such disbursement request and to withhold the amounts relating to the disapproved matters from the next succeeding
disbursement. The ten percent (10%) remaining after any of the above disbursements shall be retained by Landlord and not disbursed to Tenant until the construction of the Initial Improvements is completed and the lien period has expired with no
mechanic’s or materialmen’s liens having been filed in connection with the design or construction of the Initial Improvements. 

(d) Failure to Disburse. If Landlord fails to timely pay or contribute any portion of the Improvement Allowance or the Additional
Improvement Allowance, if applicable, within thirty (30) days following Landlord’s receipt of written notice from Tenant that such portion is past due and payable under the terms hereof, then, in each instance, Tenant shall be entitled to
deliver notice (the “Payment Notice”) thereof to Landlord and to any mortgage or trust deed holder of the Building whose identity and address have been previously provided to Tenant. If Landlord still fails to fulfill any such obligation
within twenty (20) business days after Landlord’s receipt of the Payment Notice in question from Tenant and if Landlord fails to deliver notice to Tenant within such twenty (20) business day period explaining Landlord’s reasons
that Landlord believes that the amounts described in Tenant’s Payment Notice are not due and payable by Landlord pursuant to the terms and conditions of this Improvement Agreement (“Refusal Notice”), Tenant shall be entitled, after
Landlord’s failure to pay such amounts within five (5) business days after Tenant’s delivery of a second notice from Tenant delivered after the expiration of such twenty (20) business day period, which second notice must contain
the following inscription, in 

  
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bold faced lettering: “SECOND NOTICE DELIVERED PURSUANT TO SECTION 6(e) OF THE IMPROVEMENT AGREEMENT ATTACHED TO THE LEASE — FAILURE TO TIMELY PAY THE REQUESTED PORTION OF THE
IMPROVEMENT ALLOWANCE OR ADDITIONAL ALLOWANCE, IF APPLICABLE, MAY RESULT IN TENANT’S DEDUCTION OF SUCH AMOUNT FROM RENTALS UNDER THE LEASE,” to offset the amount so owed to Tenant by Landlord but not paid by Landlord (or if Landlord
delivers a Refusal Notice but only with respect to a portion of the amount set forth in the Payment Notice and Landlord fails to pay such undisputed amount as required by the next succeeding sentence, the undisputed amount so owed to Tenant) from
the last day of such 20-business day period until the date such offset enables Tenant to recoup any and all amounts so owed to Tenant by Landlord, against Tenant’s next obligations to pay Base Rent (until
fully offset). Notwithstanding the foregoing, Landlord hereby agrees that if Landlord delivers a Refusal Notice disputing a portion of the amount set forth in Tenant’s Payment Notice, Landlord shall pay to Tenant, concurrently with the delivery
of the Refusal Notice, the undisputed portion of the amount set forth in the Payment Notice. However, if Tenant is in default, beyond applicable notice and cure periods, under the Lease at the time that such offset would otherwise be applicable,
Tenant shall not be entitled to such offset until such default is cured. If Landlord delivers a Refusal Notice, and if Landlord and Tenant are not able to agree on the disputed amounts to be so paid by Landlord, if any, within ten (10) days
after Tenant’s receipt of a Refusal Notice, Tenant may submit such dispute to arbitration in accordance with the American Arbitration Association. If Tenant prevails in any such arbitration, Tenant shall be entitled to apply such award as a
credit against Tenant’s obligations to pay monthly Base Rent until such aware is fully credited. 
 (e) Preliminary Space Plan
Allowance. In addition to the Improvement Allowance, Landlord shall provide Tenant an allowance in the amount of Ten Thousand Three Hundred Seventy-four and 20/100 Dollars ($10,374.20) (“Preliminary Space Plan Allowance”) (being $0.10
per rentable square foot time the rentable square footage of the floor area of the Premises set forth in Paragraph 1.4 of the Lease) for preparation of preliminary space plans with respect to the Premises and to assist Tenant in its evaluation of
the proposed Premises. Such Preliminary Space Plan Allowance shall be paid to Tenant within ten (10) business days following Landlord’s receipt of a written invoice evidencing the costs incurred by Tenant in connection with the preparation
of the aforesaid preliminary space plans by Tenant’s space planner. 
 7. Protection Against Lien Claims. Tenant agrees to fully
pay and discharge all claims for labor done and materials and services furnished in connection with the construction of the Initial Improvements, to diligently file or procure the filing of a valid Notice of Completion within fifteen (15) days
following substantial completion of construction of the Initial Improvements, to diligently file or procure the filing of a Notice of Cessation upon a cessation of labor on the Initial Improvements for a continuous period of thirty (30) days or
more, and to take all other reasonable steps to forestall the assertion of claims of lien against the Premises, or any part thereof or right or interest appurtenant thereto. Promptly following the filing of any Notice of Completion or Notice of
Cessation referred to above, Tenant agrees to furnish to Landlord, at no cost to Landlord, a copy of such Notice of Completion or Notice of Cessation, as the case may be. 

8. Insurance. Tenant shall, at its sole expense, be responsible for the causing Tenant’s general contractor to obtain the insurance
required below and maintain same until completion and final acceptance of the Initial Improvements. Certificates of insurance affording evidence of same shall be obtained from the Tenant’s general contractor by the Tenant and delivered to the
Landlord prior to the commencement of any work by the Tenant’s general contractor. Notwithstanding the foregoing, if Tenant intends to construct the Initial Improvements itself, then Tenant shall, at its sole expense, procure and maintain the
insurance referred to below until completion and final acceptance of the Initial Improvements and deliver certificates of insurance affording evidence of same to the Landlord prior to the commencement of any work. The required insurance coverage is
as follows: 

  
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 A. Worker’s Compensation and Employers’ Liability Insurance and affording thirty
(30) days written notice of cancellation to Landlord. The Employers’ Liability minimum limits required are as follows: 
  

			
	 Bodily Injury by accident
	  	$1,000,000 each accident
	 Bodily Injury by disease
	  	$1,000,000 policy limit
	 Bodily Injury by disease
	  	$1,000,000 each employee

 B. Commercial General Liability Insurance on an occurrence basis for an amount of $5,000,000 each occurrence
and including the following coverage: 
  

	 	i)	Premises and Operations coverage. 

  

	 	ii)	Owners and Contractors Protective coverage. 

  

	 	iii)	Products and Completed Operations coverage. 

  

	 	iv)	Blanket Contractual coverage. 

  

	 	v)	Personal Injury coverage. 

  

	 	vi)	Broad Form Property Damage coverage, including completed operations. 

  

	 	vii)	An endorsement naming Landlord as additional insured. 

  

	 	viii)	An endorsement affording 30 days written notice to Landlord in event of cancellation or material reduction in coverage. 

  

	 	ix)	An endorsement providing that such insurance as is afforded under the policy of Tenant’s general contractor is primary insurance as respects Landlord and that any other insurance maintained by Landlord is excess
and noncontributing with the insurance required hereunder. 

 No endorsement limiting or excluding a required coverage is permitted.
CLAIMS-MADE COVERAGE IS NOT ACCEPTABLE. 
 C. Business Auto Liability Insurance for an amount of $1,000,000 combined single
limit for bodily injury and/or property damage liability including: 
  

	 	i)	Owned Autos, 

  

	 	ii)	Hired or Borrowed Autos, 

  

	 	iii)	Nonowned Autos, 

  

	 	(iv)	An endorsement naming Landlord as an additional insured, and 

  

	 	(v)	An endorsement affording 30 days written notice of cancellation to Landlord in event of cancellation or material reduction in coverage. 

D. Builder’s All Risk insurance in an amount equal to the projected total cost of constructing the Initial Improvements, and such other
insurance as Landlord may reasonably require; it being understood and agreed that the Initial Improvements shall be insured in accordance with Paragraph 8.1(a) of the Lease immediately upon completion thereof. 

A certificate and endorsements affording evidence of the above requirements must be delivered to Landlord before 

Tenant’s general contractor performs any work at or prepares or delivers materials to the site of construction. 

  
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 Tenant shall require its general contractor, if any, to require its subcontractors to provide insurance where
Tenant’s contractor would be required to carry insurance under this insurance section and to be responsible for obtaining the appropriate certificates or other evidence of insurance. Notwithstanding the foregoing, with respect to such
commercial general liability insurance, Tenant’s subcontractors shall carry commercial general liability insurance with limits of liability at least equal to $2,000,000.00 per occurrence. 

In the event that the Initial Improvements are damaged by any cause during the course of the construction thereof, Tenant shall promptly repair the same at
Tenant’s sole cost and expense. Tenant’s general contractor (or Tenant, if Tenant is its own general contractor) shall maintain all of the foregoing insurance coverage in force until the Initial Improvements are fully completed and
accepted by Landlord, except for any Products and Completed Operation Coverage insurance required by Landlord, which is to be maintained for two (2) years following completion of the work and acceptance by Landlord and Tenant. All policies
carried by Tenant’s general contractor (or Tenant, if Tenant is its own general contractor) under this Paragraph 8 shall insure Landlord and Tenant, as their interests may appear. All insurance, except Workers’ Compensation, maintained by
Tenant’s general contractor (or Tenant, if Tenant is its own general contractor) and Tenant’s contractors and subcontractors shall preclude subrogation claims by the insurer against anyone insured thereunder, including Landlord. Such
insurance maintained by Tenant’s general contractor (or Tenant, if Tenant is its own general contractor) shall provide that it is primary insurance as respects the Landlord and that any other insurance maintained by the Landlord is excess and
noncontributing with the insurance required hereunder. The requirements for the foregoing insurance shall not derogate from the provisions for indemnification of Landlord by Tenant under Paragraph 11 of this Improvement Agreement. 

In addition, if Tenant is not constructing the Initial Improvements itself, then, during the construction of the Initial Improvements referred to herein,
Tenant shall maintain all insurance required to be maintained by Tenant under the Lease. 
 If the Tenant fails to cause Tenant’s contractor to secure
and maintain the required insurance or fails to secure and maintain the insurance required to be maintained by Tenant under the Lease or this Improvement Agreement, the Landlord shall have the right (without any obligation to do so, however) to
secure same in the name and for the account of the Tenant’s contractor, if applicable, or Tenant, as the case may be, in which event the Tenant shall pay the cost thereof and shall furnish upon demand, all information that may be required in
connection therewith. Further, such failure to secure and maintain the required insurance shall constitute a material default by Tenant under the Lease and Landlord shall be entitled to immediately have all Initial Improvement work cease. 

9. Safety and Construction Rules; Faulty Tenant Work. Tenant and Tenant’s contractors shall abide by all reasonable safety and
construction rules and regulations of Landlord, and all work and deliveries shall be scheduled through Landlord. All Tenant’s materials, work, installations and decorations of any nature brought upon or installed in the Premises by Tenant or
its contractors, subcontractors, materialmen, agents, employees, subtenants, successors or assigns shall be at Tenant’s risk, and neither Landlord nor any party acting on Landlord’s behalf shall be responsible for any damage thereto or
loss or destruction thereof. Tenant’s contractors shall not post any signs other than those required by law in connection with the construction on any part of the Project or Premises. Tenant shall reimburse Landlord for any extra expenses
reasonably incurred by Landlord by reason of faulty work done by Tenant or its contractors or by reason of cleanup which fails to comply with Landlord’s rules and regulations. 

  
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 10. Evidence of Compliance with Government Regulations. Upon completion of construction or
installation of the Initial Improvements, Tenant shall furnish to Landlord copies of such certificate(s) of occupancy, or their equivalent, as may be required or issued by any public authority having jurisdiction. 

11. Indemnification. Tenant shall, at Tenant’s expense, defend, indemnify, save and hold Landlord and its agents, employees,
contractors, members, partners, shareholders, officers, directors, successors and assigns harmless from any and all claims, demands, losses, injuries, actions, liabilities, judgments, liens, damages (general, punitive or otherwise), causes of action
(whether legal or equitable in nature), costs and expenses (including, without limitation, attorneys’ fees and court costs) asserted by any person, firm, corporation, governmental body or agency, or entity arising out of, related to, or in
connection with the construction of the Initial Improvements; provided, however, in no event shall the foregoing be construed as requiring Tenant to indemnify, defend, save or hold harmless the Landlord or any other person or entity for any claims,
demands, losses, injuries, actions, liabilities, judgments, liens, damages (general, punitive or otherwise), causes of action (whether legal or equitable in nature), costs and expenses to the extent caused by the negligence or willful misconduct of
Landlord or such other person or entity or their respective employees, contractors or agents. Tenant shall pay to Landlord within thirty (30) days after receipt of written demand all claims, judgments, damages, losses or expenses (including
attorneys’ fees) incurred by Landlord (or any of its agents, employees, contractors, members, partners, shareholders, officers, directors, successors or assigns) as a result of any legal action arising out of the construction of the Initial
Improvements; provided, however, in no event shall the foregoing be construed as requiring Tenant to pay any claims, judgments, damages, losses or expenses (including attorneys’ fees) to the extent caused by the negligence or willful misconduct
of Landlord or any of its agents, employees, contractors, members, partners, shareholders, officers, directors, successors or assigns or their respective employees, contractors or agents. The obligations of Tenant under this Paragraph 11 shall
survive the termination of the Lease. 
 12. Default. Each of the following events shall constitute an “Event of Default” by
Tenant hereunder: 
 (a) Material or substantial deviation in construction work from the Final Plans, without the prior written approval of
Landlord or the appearance of defective workmanship or materials when said deviations or defects are not corrected within thirty (30) days after written notice thereof; 

(b) Cessation, after commencement of construction work prior to the completion of the Initial Improvements for a continuous period of twenty
(20) days or more for causes other than causes beyond the reasonable control of Tenant and such cessation is not cured within ten (10) days after written notice of such breach is given by Landlord to Tenant; 

(c) The filing of any claim of lien against the Premises or any part thereof, in connection with the Initial Improvements, and the continued
maintenance of said claim of lien for a period of twenty (20) days after notice from Landlord to Tenant thereof without discharge or satisfaction thereof or provision therefor satisfactory to Landlord (at Landlord’s sole discretion); 

(d) A decree or order of a court having jurisdiction shall have been entered adjudging Tenant to be bankrupt or insolvent or approving as
properly filed a petition seeking the reorganization of Tenant under the federal bankruptcy law or any other applicable law or statute of the United States, or any state, or appointing a receiver or trustee or assignee in bankruptcy or insolvency
for Tenant and its property, or directing the winding-up or liquidation of Tenant, and such decree or order shall remain continuing, undischarged or unstayed for a period of thirty (30) days; 

(e) A general assignment by Tenant of its assets for the benefit of creditors, or a sequestration or attachment of or execution upon any
substantial part of such property, unless the property so assigned, sequestered, attached or executed upon shall have been returned or released within thirty (30) days after such event or prior to a sooner sale pursuant to such sequestration,
attachment or execution; 

  
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 (f) Commencement of proceedings for winding up or dissolving (whether voluntary or involuntary)
the entity of Tenant, if Tenant is a corporation, limited liability company or a partnership; or 
 (g) The occurrence of a Default by Tenant
under the Lease. 
 13. Remedies. If an Event of Default by Tenant occurs hereunder, Landlord shall have the right (but not the
obligation) to enter upon the Premises and take over and complete the construction of the Initial Improvements, and to discharge or replace the contractors or subcontractors performing such work. In no event shall Landlord be required to expend its
own funds in excess of the Improvement Allowance to complete the Initial Improvements and all costs reasonably incurred by Landlord in completing the Initial Improvements in excess of the Improvement Allowance shall be reimbursed by Tenant to
Landlord within thirty (30) days following receipt of a written invoice(s) or statement(s) and reasonable backup documentation evidencing the costs incurred by Landlord in completing such Initial Improvements. Where material or substantial
deviations from the Final Plans have occurred which have not been approved in accordance with Paragraph 4 of this Improvement Agreement, or defective or unworkmanlike labor or materials are being used in construction of the Initial Improvements,
Landlord shall have the right to immediately order stoppage of all construction and demand that such condition be corrected. After issuance of such an order in writing, no further work shall be done on the Initial Improvements without the prior
written consent of Landlord unless and until said condition has been fully corrected and upon correction, Landlord shall promptly consent to the continuation of construction. 

14. Attorneys’ Fees. If any action or proceeding is commenced to enforce the provisions of this Agreement, the prevailing party in
such action or proceeding shall have the right to recover from the other party its reasonable attorneys’ fees and costs and expenses of litigation. 

15. Time is of the Essence. Time is of the essence of this Agreement. 

  
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 EXHIBIT D 

COMMENCEMENT DATE LETTER 
  

	Re:	Lease dated                    , 2018, between 237 North First Street Holdings, LLC, a Delaware limited liability
company, as Landlord, and Bloom Energy Corporation, a Delaware corporation, as Tenant, concerning that premises leased by Tenant from Landlord located in the building situated at 4353 North First Street, San Jose, California (the
“Premises”). 

 Ladies and Gentlemen: 

In accordance with the subject Lease, we wish to advise and/or confirm as follows: 

1. Landlord delivered possession of the Premises to Tenant on
                    , with all improvements and work, if any, required to be performed by Landlord completed in a good and workmanlike manner and
otherwise in the condition required under the Lease and Tenant accepted possession of the Premises. 
 2. The Commencement Date of the
initial Term for the Premises is                     , 201     and the Ending Date of the initial Term for the Premises is
                    ,        , unless sooner terminated according to the terms of the Lease. 

3. That in accordance with the Lease, monthly Base Rent shall commence to accrue at the end of the six (6) month Abatement Period on
                    , 201    , and Tenant’s obligation to pay Tenant’s percentage share of Operating Expenses (as
described below) shall commence to accrue on the Commencement Date. 
 4. Each party represents and warrants to the other that it is duly
authorized to enter into this document and that the person signing on its behalf is duly authorized to sign on behalf of such party. 
  

			
	LANDLORD:
	
	 237 NORTH FIRST STREET HOLDINGS, LLC,

a Delaware limited liability company

 
			
		
	By:	 	 /s/ Donald H. Kuemmeler

	Name:	 	 Donald H. Kuemmeler

	Title:	 	 Authorized Signatory

	
	ACCEPTED AND AGREED:
	
	TENANT:
	
	 BLOOM ENERGY CORPORATION,
 a
Delaware corporation

		
	By:	 	 /s/ Shawn Soderberg

	Name:	 	 Shawn Soderberg

	Its:	 	 EVP, Legal Counsel & Secretary

  
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 EXHIBIT E 

SITE PLAN SHOWING LOCATION OF RETAIL BULDING 

[see attached] 

  
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 EXHIBIT E 

SITE PLAN SHOWING LOCATION OF RETAIL BULDING 
  

 

  
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 EXHIBIT F 

LEGAL DESCRIPTION OF LAND 
 Real property in the
City of San Jose, County of Santa Clara, State of California, described as follows: PARCEL ONE: 
 PARCELS A, B AND C AS SHOWN ON THAT CERTAIN PARCEL MAP
FILED FOR RECORD ON JANUARY 26, 2017 IN BOOK 901 OF MAPS AT PAGES 28-33, SANTA CLARA COUNTY RECORDS. 

EXCEPTING THEREFROM, THE UNDERGROUND WATER RIGHTS, WITHOUT THE RIGHT OF SURFACE ENTRY AS CONVEYED TO THE CITY OF SAN JOSE, A MUNICIPAL CORPORATION BY
QUITCLAIM DEED AND AUTHORIZATION RECORDED DECEMBER 22, 2015 AS INSTRUMENT NO. 23178813 OF OFFICIAL RECORDS. 
 PARCEL TWO: 

NON-EXCLUSIVE EASEMENTS FOR VEHICULAR ACCESS, SURFACE DRAINAGE RELEASE, PEDESRRIAN ACCESS, UTILITY, EMERGENCY ACCESS
AND APPURTENANCES THERETO AS SET FORTH IN DECLARATION OF EASEMENTS RECORDED APRIL 22, 2015 AS INSTRUMENT NO. 22923805 OF OFFICIAL RECORDS. 
 PARCEL
THREE: 
 EASEMENTS, APPURTENANT OT PARCEL ONE ABOVE, AS SET FORTH, AND UPON THE TERMS AND CONDITIONS CONTAINED IN THAT CERTAIN “GRANT OF EASEMENTS AND
AGREEMENT” RECORDED MAY 29, 2015 AS INSTRUMENT NO. 22969199 OF OFFICIAL RECORDS. 
 APN: 015-39-055 

  
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 EXHIBIT F-1 

ASSESSOR’S PARCEL MAP 
 [see
attached] 

  
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 EXHIBIT F-1 

ASSESSOR’S PARCEL MAP 
  

 

  
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 EXHIBIT F-2 

PARCEL MAP 
  

 

  
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 EXHIBIT G 

RESTRICTED COMMON AREA (to be shown cross-hatched) 

[see attached] 

  
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 EXHIBIT G 

LOCATION OF THE RESTRICTED COMMON AREA 
  

 

  
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 EXHIBIT H 

LIST OF ENVIRONMENTAL REPORTS DELIVERED OR MADE AVAILABLE TO TENANT 

ELECTRONICALLY 
  

	1.	2020592 Syntax Ct – CR – 2014-15 

  

	2.	Initial Landfill Gas Migration Monitoring Report Second & Third Quarters 2015 

  

	3.	Landfill Gas Migration Monitoring Report Fourth Quarter 2015 

  

	4.	Landfill Gas Migration Monitoring Report First Quarter 2016 

  

	5.	Third and Fourth Quarter Monitoring Report 2016 

  

	6.	First and Second Quarter Monitoring Report 2017 

  

	7.	157-6-2 237 @ 1st Street Design-Level Report 9-5-14 Syntax Ct Geotech 

  

	8.	237 Landfill Gas Monitoring Plan 02-23-15 

  

	9.	ET Cover CQA Plan 4-17-15 

  

	10.	Final Site Investigation Report Volume 2 Appendices 

  

	11.	Final Site Investigation Report Volume 1 Text, Tables, Figures 

  

	12.	Remedy Implementation & Post Remediation Monitoring Report 

  

	13.	Soil Management Plan Update 237 @ First St Development Project 2152015 

  

	14.	DISC Annual Inspection 2017 

  

	15.	Syntax Court Concur letter—Final 

  

	16.	Deed Restriction with Exhibits 

  

	17.	DTSC Annual Inspection 2016 

  

	18.	Brownfield Status 237 @ First Street Development Project San Jose 

  

	19.	Final Phase I ESA Rpt Parcel 1 4353 & 4453 North First St San Jose 08192015 

  

	20.	CPCLUP FINAL 021915 

  

	21.	Cisco Survey Results Feb TM 02062015 

  
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 EXHIBIT I 

PRE-APPROVED SIGNAGE DESIGN 

[see attached] 

  
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 EXHIBIT I 

 

 
 EXHIBIT I 

 EXHIBIT J 

RULES AND REGULATIONS 
 1. The sidewalks, halls,
passages, courts, exits, vestibules, entrances, public areas, elevators and stairways of the Building shall not be obstructed by Tenant or used by Tenant for any purpose other than ingress to and egress from the Premises. The halls, passages, exits,
entrances, elevators and stairways are not for the general public, and Landlord shall, in all cases, retain the right to control and prevent access thereto by all persons whose presence in the reasonable judgment of Landlord would be prejudicial to
the safety, character, reputation and interests of the Building and its lessees and/or other occupants, provided that nothing herein contained shall be construed to prevent such access to persons with whom Tenant normally deals in the ordinary
course of its business, unless such persons are engaged in illegal activities. If the Premises are situated on the ground floor with direct access to the street, then Tenant shall, at Tenant’s expense, keep the sidewalks and curbs directly in
front of the Premises clean and free from dirt, refuse or other obstructions. Tenant shall not place any parcels or other articles in the halls or in any other part of the Building outside of the Premises. Tenant shall not throw or allow to be
thrown any article out of the doors or windows of the Premises. 
 2. Neither Tenant nor any employee, agent, contractor or invitee of Tenant shall go upon
the roof of the Building, except to the extent expressly permitted by Tenant’s Lease. 
 3. Except as otherwise expressly permitted pursuant to the
terms of Tenant’s Lease of the Premises, (i) no sign, placard, awning, picture, name, advertisement or notice visible from the exterior of the Premises shall be inscribed, painted, affixed or otherwise displayed by Tenant on any part of the
Building without the prior written consent of Landlord, and (ii) written material visible from outside the Building will not be permitted. 
 4. The
Premises shall not be used for the storage of merchandise held for sale to the general public or for lodging. No cooking shall be done or permitted by Tenant or any Tenant Related Parties in the Premises, except the use by Tenant or any of its
employees of Underwriter’s Laboratory approved (or a reasonable equivalent) microwave ovens, toaster ovens or equipment for brewing coffee, tea, hot chocolate and similar beverages, provided that such use is in accordance with all applicable
federal, state and city laws, codes, ordinances, rules and regulations and is provided only for the convenience of Tenant and its employees and invitees. Hot plates and space heaters shall not be allowed or used in the Premises. No burning candles
or other open flame shall be ignited or kept by Tenant or any Tenant Related Parties in the Premises or about the Project. 
 5. Tenant shall not employ any
person or persons other than the janitor of Landlord for the purpose of cleaning the Premises, unless otherwise agreed to by Landlord in writing. Except with the written consent of Landlord, no person or persons other than those approved by Landlord
shall be permitted to enter the Building for the purpose of cleaning the Premises. Tenant shall not cause any unnecessary labor by reason of such Tenant’s carelessness or indifference in the preservation of good order and cleanliness. 

6. In connection with Tenant’s initial occupancy of the Premises, Landlord will furnish Tenant, at no charge to Tenant, with four hundred fifty
(450) keys/access cards, which keys/access cards shall provide access to each entry door lock to the Premises. Landlord shall charge Ten Dollars ($10.00) for each additional key/access card requested by Tenant (in excess of the 3.3 per 1,000
rentable square feet allotment described in the preceding sentence). Tenant shall not have any additional keys/access cards made. Except as otherwise expressly set forth in the Lease, Tenant shall not alter any lock or install a

  
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 new or additional lock or bolts on any door to the Premises without the prior written consent of Landlord. In the
event Landlord consents to Tenant’s alteration of a lock and/or installation of new or additional locks or bolts, on any door to the Premises such alteration and/or installation shall be made at Tenant’s sole cost and expense. In addition,
Tenant shall provide Landlord with a master key to all locks on doors within the Premises. Tenant shall in each case furnish Landlord with a key/access card for any such lock. Tenant, upon the expiration of the Term, as the same may be extended, or
sooner termination of this Lease, shall deliver to Landlord all keys/access cards to doors in the Building that shall have been furnished to Tenant. In the event that any keys/access cards are lost, stolen, damaged or otherwise not returned by
Tenant to Landlord upon the expiration or sooner termination of this Lease, Tenant shall pay Landlord Twenty-five Dollars ($25.00) for any such keys/access cards. 

7. The moving of freight, furniture or bulky material of any description in or out of the Building must take place during such hours as Landlord may from time
to time reasonably determine including weekends or non-business hours. The moving of freight, furniture or bulky material shall be made upon previous notice to the superintendent or manager of the Building and
the persons employed by Tenant for such work must be reasonably acceptable to Landlord. Tenant may, subject to the provisions of the immediately preceding sentence, move freight, furniture or bulky material into or out of the Premises on Saturdays
between the hours of 8:00 a.m. and 6:00 p.m. provided that Tenant gives Landlord at least two 
 (2) days’ prior written notice of such proposed
activities and pays the additional costs, if any, incurred by Landlord for elevator operators, security guards and other expenses arising by reason of such activities by Tenant. Landlord will not be responsible for loss of or damage to any such
property from any cause and all damage done to the Building by moving or maintaining such property shall be repaired at the expense of the Tenant. 
 8.
Tenant shall not overload the floor of the Premises. Heavy objects, machinery and/or equipment to be located in the Premises shall be placed on wood strips of such thickness as is necessary to properly distribute the weight, if reasonably deemed
necessary by Landlord. Business machines and other equipment or machinery shall be placed and maintained by Tenant at Tenant’s expense in locations sufficient, in Landlord’s reasonable judgment, to absorb and prevent unreasonable vibration
and prevent noise and annoyance. 
 9. Tenant shall not permit the Premises to be occupied or used in any manner that is offensive or objectionable to
Landlord or any lessee or invitee of the Building, in Landlord’s reasonable judgment, by reason of sounds, odors, vibrations or electromagnetic interference. Social events held by Tenant in the Premises, such as birthday parties and holiday
parties, shall be contained within the Premises and, in connection therewith, Tenant shall not disturb or interfere with other tenants or occupants of the Building by the use of any musical instrument, radio, phonographs or unusual noise, or in any
other way. 
 10. Landlord shall have the right, exercisable without liability to Tenant, but with notice thereof given to Tenant at least sixty
(60) days in advance of the change, to change the name and street address of the Building. 
 11. Landlord reserves the right to exclude from the
Building, between the hours of 6:00 p.m. and 7:00 a.m., and during all hours on Saturdays, Sundays and legal holidays, all persons who do not present a pass to the Building signed by Landlord. Landlord will furnish passes to persons for whom Tenant
requests the same in writing. Tenant shall be responsible for all persons for whom it requests passes and shall be liable to Landlord for all acts of such persons. Landlord shall, in no case, be liable for damages for any error with regard to the
admission to or exclusion from the Building of any person. In the case of invasion, mob, riot, public excitement or other circumstances rendering such action advisable in Landlord’s reasonable opinion, Landlord reserves the right to prevent
access to the Building or the Project during the continuance of the same by such action as Landlord may deem appropriate including closing doors to the Building and closing entrance ways to the Project. 

  
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 12. No curtains, draperies, blinds, shutters, shades, screens or other coverings, hangings or decorations shall
be attached to, hung or placed in, or used in connection with any window of the Premises without the prior written consent of Landlord. No files, cabinets, boxes, containers or similar items shall be placed in, against or adjacent to any window of
the Premises so as to be visible from the outside of the Building. 
 13. Tenant shall not obtain for use in the Premises, drinking water, ice, food,
beverage, towel or other similar services, except at such reasonable hours and subject to such reasonable rules as Landlord may impose in connection therewith. Except for vending machines intended for the sole use of Tenant’s employees,
licensees and invitees, no vending machine or machines other than fractional horsepower office machines shall be installed, maintained or operated in the Premises without Landlord’s prior written consent. 

14. Tenant shall see that the doors of the Premises are closed and locked and that all water faucets, water apparatus and lights are shut off before Tenant and
Tenant Related Parties, and their respective agents and employees leave the Premises so as to prevent waste or damage, and Tenant shall be responsible for all injuries sustained by Landlord or other tenants or occupants of the Building resulting
from Tenant’s failure to do so. Tenant shall keep the doors to the Building corridors closed at all times, except for ingress and egress. 
 15. The
restrooms rooms, toilets, urinals, wash bowls and other apparatus shall not be used for any purpose other than that for which they were installed, and Tenant shall not throw any foreign substance of any kind whatsoever in the same and the expense of
any breakage, stoppage or damage resulting from the violation of this rule shall be borne by Tenant. 
 16. Except with the prior written consent of
Landlord, Tenant shall not sell, or permit the sale by any Tenant Related Parties, at retail of newspapers, magazines, periodicals, or any other goods or merchandise to the general public in or on the Premises or Building. Tenant shall not use the
Premises for manufacturing of any kind or any business or activity other than that specifically provided for in Tenant’s Lease. Anything herein or in the Tenant’s Lease to the contrary notwithstanding, no lead soldering shall be
permitted in the Premises. 
 17. Except as expressly set forth in the Lease, Tenant shall not install or attach any radio or television antenna, loud
speaker, air conditioning unit, awning or other item or device on the roof or to exterior surface of the exterior walls of the Building. Tenant also shall not install or attach any air conditioning unit or equipment in the plenum without
Landlord’s prior written consent. 
 18. Tenant shall not use or permit the use of any hand trucks except those equipped with inflatable rubber tires
and side guards or such other materials handling equipment as Landlord may approve. 
 19. Tenant shall store all its trash and garbage within its Premises.
No material shall be placed in the trash boxes or receptacles if such material is of such nature that it may not be disposed of in the ordinary and customary manner of removing and disposing of trash and garbage in the City of San Jose without being
in violation of any law or ordinance governing such disposal. The transportation of trash, garbage and refuse from the Premises shall be made only through entry ways and elevators provided for such purposes and at such times as Landlord reasonably
shall designate. 

  
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 20. Canvassing, peddling, soliciting and distribution of handbills or any other written materials in the Building
(or the Parcel B Building, if applicable, as described in the Lease) are prohibited and Tenant shall cooperate with Landlord to prevent the same. 
 21.
Tenant and its employees, authorized representatives and invitees shall not (a) make or permit any noise in the Building that is unreasonably annoying or interfering in any way with Landlord, other tenants or those having business with them,
(b) bring into or keep within the Premises, the Building or the Common Areas any conveyance or other vehicle, except such vehicles as are permitted to park in the parking areas in accordance with these Rules and Regulations, (c) place or
store any item or vehicle in the Common Areas (except that Tenant shall be permitted to place Generators and Bloom Boxes in portions of the Common Area approved by Landlord and to the extent allowed by Landlord pursuant to the terms of Tenant’s
Lease); or (d) use any of the Common Area for any event, promotion or gathering, without the prior written consent of Landlord, which consent may be conditioned, withheld or granted at the sole but reasonable discretion of Landlord. Bicycles
are not permitted inside the Building or on the walkways outside the Building, except in areas designated by Landlord. Landlord, at no cost to Tenant, shall provide secure bicycle storage for up to forty (40) bicycles in the Common Area outside
the Building for use by Tenant’s employees. 
 22. Tenant shall not bring into or keep within the Premises, the Building or Common Area any
animal except service dogs assisting handicapped persons, subject to the following conditions: 
 (i) The use and entry onto the Premises, the
Building or the Project of any service dog shall at all times comply with all applicable Laws. 
 (ii) All service dogs shall be strictly controlled at all
times and shall not be permitted to foul, damage or otherwise mark any part of the Premises, the Building or the Project, or cause any loud noise whether through barking, growling or otherwise. 

(iii) Any service dog brought into and remaining in the Premises shall be limited to the hours such dog’s owner is on the Premises. 

(iv) All service dogs shall remain in the Premises and not wander throughout the Building or the Project or otherwise be left unattended. 

(v) While in any portions of the Project other than the Premises (including without limitation any Exterior Common Areas), all service dogs shall be kept on
leashes. 
 (vi) Upon Landlord’s request from time to time, Tenant shall provide Landlord with evidence of all current vaccinations for service dogs
having access to the Premises. 
 (vii) Tenant shall be responsible for any additional cleaning costs and all other costs which may arise from any service
dog’s presence in the Premises, the Building, the Exclusive Common Area or the Project in excess of the costs that would have been incurred had such service dog not been allowed in or around the Premises. 

(viii) Tenant shall be liable for, and hereby agrees to indemnify, defend, protect and hold Landlord and Landlord’s agents, employees, affiliates,
members, managers, officers, directors, shareholders, contractors, subcontractors, licensees, invitees and sublessees harmless from and against any and all losses, costs, damages, liability, claims and expenses (including without limitation
attorneys’ and experts’ fees, costs of suit and costs of any appeal) arising from any and all acts (including but not limited to biting and causing bodily injury to, or damage to the property of, another tenant, subtenant, occupant,
licensee, invitee or an employee of Landlord or any of the Landlord Parties) of, or the presence of, any service dog in or about the Premises, the Building or the Project; provided, however, in no event shall the foregoing be construed as requiring
Tenant to indemnify, defend, protect or hold harmless the Landlord or any other person or entity for any losses, costs, damages, liability, claims and expenses (including without limitation attorneys’ and experts’ fees, costs of suit and
costs of any appeal) to the extent caused by the negligence or willful misconduct of Landlord or such other person or entity (other than Tenant Related Parties) or their respective employees, contractors or agents. 

  
 -4- 

 (ix) Tenant shall immediately remove any dog waste and excrement from the Premises, the Building and the Project.
If Landlord reasonably determines that Landlord has incurred or is incurring costs as a result of the service dogs’ presence, Tenant shall reimburse Landlord for such costs as additional rent within twenty (20) days of Landlord’s
demand. 
 (x) Tenant shall provide Landlord with reasonably satisfactory evidence that Tenant’s commercial general liability insurance policy provides
commercially reasonable coverage for the presence of service dogs in the Premises. 
 (xi) No service dog with (or suspected of having) fleas is to be
brought into the Premises. 
 23. Tenant shall not drive nails or screws or drill into the partitions, woodwork or walls of the Premises except to affix
standard pictures or other wall hangings on the interior walls of the Premises so long as they are not visible from the exterior of the Building. Tenant shall not mark or in any way deface partitions, woodwork, walls or doors of the Premises. 

24. Landlord shall direct electricians as to where and how telephone and communications wires are to be introduced. No cutting or boring for wires shall be
allowed without Landlord’s consent, which shall not be unreasonably withheld, conditioned or delayed. The location of telephones, call boxes and office equipment affixed to the Premises shall be subject to Landlord’s approval. 

25. Tenant shall not lay or affix any floor covering in the Premises so that it is permanently affixed to the floor slab of the Premises, without
Landlord’s approval. 
 26. Tenant shall not, without Landlord’s prior written consent, use any method of heating or air conditioning other than
that supplied by Landlord. Tenant shall not knowingly waste electricity, water or air conditioning, shall reasonably cooperate with Landlord to ensure the most effective operation of the Building’s and Premises’ heating and air
conditioning system, and shall not attempt to adjust any controls. Tenant shall install and use in the Premises only ENERGY STAR rated equipment, where available on a cost-effective basis (as determined by Tenant). Tenant shall use recycled paper in
the Premises to the extent consistent with its business requirements and available on a cost-effective basis (as determined by Tenant). 
 27. Tenant shall
comply with Landlord’s commercially reasonable recycling program, if any. 
 28. Neither Tenant nor any of its agents, employees, contractors, invitees,
licensees, subtenants or other representatives shall request that any food trucks appear at the Project on a regular basis. 
 29. Tenant shall comply with
all safety, fire protection and evacuation procedures and regulations established by any governmental agency or reasonably established by Landlord. 
 30.
Before commencing any repairs, alterations, additions or improvements to the Premises, Tenant shall deliver to Landlord the names of contractors, subcontractors, mechanics, laborers and materialmen and also deliver to Landlord, and obtain
Landlord’s approval of, (i) evidence of contractors’ and subcontractors” insurance and (ii) any required governmental approvals or permits. 

31. The requirements of Tenant will be attended to only upon application by telephone or in person at the office of the Building superintendent or
Landlord’s property manager. Employees of Landlord shall not perform any work or do anything outside of their regular duties unless under special instructions from Landlord. 

  
 -5- 

 31. Tenant and its employees, agents, contractors, licensees and invitees shall comply with all speed limit, curb
markings and directional and other signage located in or about the driveways and parking areas. All parking spaces are unreserved and unassigned unless otherwise designated. All parking spaces shall be used only for parking of vehicles no larger
than full size passenger automobiles, sports utility vehicles, pickup trucks and other non-commercial vehicles. Tenant shall not permit or allow any vehicles that belong to or are controlled by Tenant or any
Tenant Related Parties to be loaded, unloaded or parked in areas other than those provided for such activities. No vehicle services (such as windshield or window replacement, washing, waxing, detailing, oil changes or other mechanical servicing)
shall be performed in the parking areas. If Tenant or any Tenant Related Parties conducts, permits or allows any of the prohibited activities described above, then Landlord shall have the right, without notice, in addition to such other rights and
remedies that Landlord may have, to remove or tow away the vehicle involved and charge the costs of removal of the vehicle and any clean-up to Tenant. 

32. Tenant shall not smoke or permit smoking by any Tenant Related Parties, in the Common Area unless a portion of the Common Area has been declared a
designated smoking area by Landlord, nor shall the above parties allow smoke from the Premises to emanate into the Common Area or any other part of the Building. Landlord shall have the right to designate the Building (including the Premises) as a non-smoking building. Tenant shall comply with the State of California “No-Smoking” law set forth in California Labor Code Section 6404.5 and with any local “No-Smoking” ordinance that is not superseded by such law. 
 33. Landlord may waive any one or more of these
Rules and Regulations for the benefit of any Tenant or other particular tenants, but no such waiver by Landlord shall be construed as a waiver of such Rules and Regulations in favor of any other tenant or tenants, nor prevent Landlord from
thereafter enforcing any such Rules and Regulations against any or all of the tenants of the Building. 
 34. These rules and regulations are in addition to,
and shall not be construed to in any way modify or amend, in whole or in part, the terms, covenants, agreements and conditions of Tenant’s Lease of Premises. Landlord reserves the right to make such other reasonable Rules and Regulations as, in
its judgment, may from time to time be needed for the safety, care and cleanliness of the Building, Common Area or Project, and for the preservation of the order therein. 

35. Landlord shall not be responsible to Tenant or to any other person for the non-observance or violation of these
Rules and Regulations by any other tenant or other person or entity. Tenant shall be deemed to have read these Rules and Regulations and to have agreed to abide by them as a condition to its occupancy of the Premises. 

36. The “Ordinary Business Hours” of the Building shall be 7:00 a.m. to 6:00 p.m. on business days (exclusive of Saturdays, Sundays and holidays).

  
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 EXHIBIT K 

SITE PLAN SHOWING LOCATION(S) OF BLOOM BOXES 

[to be attached at later date per terms of Paragraph 48 of Lease] 

  
 -1- 

 EXHIBIT L 

SITE PLAN SHOWING LOCATION(S) OF GENERATORS 

[to be attached at later date per terms of Paragraph 49 of Lease] 

  
 -1- 

 EXHIBIT L-1 

SITE PLAN IDENTIFYING LOCATION(S) OF FUEL OR POWER LIINES 

FROM GENERATOR(S) TO BUILDING 
 [to
be attached at later date per terms of Paragraph 49 of Lease] 

  
 -1- 

 EXHIBIT M 

LIST OF COMPETITORS 
 Any energy company or
energy division, group or subsidiary of a larger company 
 Any company that develops or manufactures fuel cells 

  
 -1-

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