Document:

Amendment dated November 18, 2011 to the Credit Agreement dated October 21, 2010

 Exhibit 10.3 
 SECOND AMENDMENT 
 THIS SECOND AMENDMENT (this “Amendment”) dated
as of November 18, 2011 to the Credit Agreement referenced below is by and among CACI International Inc, a Delaware corporation (the “Borrower”), the Guarantors identified on the signature pages hereto, the Lenders identified
on the signature pages hereto and Bank of America, N.A., in its capacity as Administrative Agent (in such capacity, the “Administrative Agent”). 
 W I T N E S S E T H 
 WHEREAS, revolving credit and term loan facilities have been
extended to the Borrower pursuant to the Credit Agreement (as amended, modified, supplemented, increased and extended from time to time, the “Credit Agreement”) dated as of October 21, 2010 among the Borrower, the Guarantors
identified therein, the Lenders identified therein and the Administrative Agent; and 
 WHEREAS, the Borrower has requested
certain modifications to the Credit Agreement and all the Lenders have agreed to the requested modifications to the Credit Agreement on the terms and conditions set forth herein. 

NOW, THEREFORE, IN CONSIDERATION of the premises and other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows: 
 1. Defined Terms. Capitalized terms used herein but not
otherwise defined herein shall have the meanings provided to such terms in the Credit Agreement. 

  
 6 

 2. Amendments. The Credit Agreement is amended as follows: 

2.1 The table in the definition of “Applicable Rate” in Section 1.01 is amended to read as follows: 

 

															
	 Pricing
 Tier
	  	 Consolidated Total
 Leverage Ratio
	  	Eurodollar
Rate
Loans	 	 	 Base
Rate
 Loans
	 	 	Commitment
Fee	 
					
	1	  	< 1.25:1.0	  	 	1.25	% 	 	 	0.25	% 	 	 	0.20	% 
					
	2	  	3 1.25:1.0 but < 2.25:1.0	  	 	1.50	% 	 	 	0.50	% 	 	 	0.25	% 
					
	3	  	3 2.25:1.0 but < 3.25:1.0	  	 	1.75	% 	 	 	0.75	% 	 	 	0.30	% 
					
	4	  	3 3.25:1.0 but < 4.25:1.0	  	 	2.00	% 	 	 	1.00	% 	 	 	0.35	% 
					
	5	  	3 4.25:1.0	  	 	2.50	% 	 	 	1.50	% 	 	 	0.40	% 

 2.2 In the definition of “Applicable Rate” in Section 1.01 the reference to “Pricing
Tier 6” is amended to read “Pricing Tier 5” and a new sentence is inserted before the last sentence of the definition to read as follows: 
 The Applicable Rate in effect from the effective date of the Second Amendment to this Agreement through the first Business Day immediately following the date a Compliance Certificate is required to be
delivered pursuant to Section 7.02(b) for the fiscal quarter ending December 31, 2011 shall be determined based upon Pricing Tier 2. 
 2.3 In the definition of “Consolidated Fixed Charges” in Section 1.01 clause (d) is amended to read as follows: 
 Restricted Payments made under Section 8.06(d) (other than (i) Specified Restricted Payments and (ii) all other Restricted Payments made since the end of the most recent Applicable
Period most recently ended prior to the date of such Restricted Payment if, at the time any such Restricted Payment is made, the Consolidated Total Leverage Ratio recomputed as of the end of such Applicable Period is less than 3.0:1.0 on a Pro Forma
Basis after giving effect to such Restricted Payment plus all other Restricted Payments made since the end of such Applicable Period). 
 2.4 The definition of “Maturity Date” in Section 1.01 is amended to read as follows: 
 “Maturity Date” means November 18, 2016; provided, however, that if such date is not a Business Day, the Maturity Date shall be the next preceding Business Day.

  
 7 

 2.5 In the definition of “Specified Restricted Payments” in Section 1.01, the
word “and” is inserted after clause (a), a period is inserted after clause (b) and clauses (c) and (d) are deleted in their entirety. 
 2.6 The table in Section 2.07(c) is amended to read as follows: 
  

					
	 Payment Dates
	  	Principal
Amortization
Payment	 
		
	 March 31, 2011
	  	$	1,875,000	  
		
	 June 30, 2011
	  	$	1,875,000	  
		
	 September 30, 2011
	  	$	1,875,000	  
		
	 December 31, 2011
	  	$	1,875,000	  
		
	 March 31, 2012
	  	$	1,875,000	  
		
	 June 30, 2012
	  	$	1,875,000	  
		
	 September 30, 2012
	  	$	1,875,000	  
		
	 December 31, 2012
	  	$	1,875,000	  
		
	 March 31, 2013
	  	$	1,875,000	  
		
	 June 30, 2013
	  	$	1,875,000	  
		
	 September 30, 2013
	  	$	1,875,000	  
		
	 December 31, 2013
	  	$	1,875,000	  
		
	 March 31, 2014
	  	$	1,875,000	  
		
	 June 30, 2014
	  	$	1,875,000	  
		
	 September 30, 2014
	  	$	1,875,000	  
		
	 December 31, 2014
	  	$	1,875,000	  
		
	 March 31, 2015
	  	$	1,875,000	  
		
	 June 30, 2015
	  	$	1,875,000	  
		
	 September 30, 2015
	  	$	1,875,000	  
		
	 December 31, 2015
	  	$	3,750,000	  
		
	 March 31, 2016
	  	$	3,750,000	  
		
	 June 30, 2016
	  	$	3,750,000	  
		
	 September 30, 2016
	  	$	3,750,000	  
		
	 Maturity Date for the Term Loan
	  	 
 
 	Unpaid principal
balance of the
Term Loan	  
  
  

  
 8 

 2.7 The reference to “$200 million” in clause (iv)(A) of the second proviso of
Section 11.01 is amended to read “$300 million”. 
 3. Conditions Precedent. This Amendment shall become
effective as of the date hereof upon satisfaction of each of the following conditions precedent: 
 (a)
Amendment. Receipt by the Administrative Agent of executed counterparts of this Amendment executed by the Loan Parties and the Lenders. 
 (b) Opinions of Counsel. Receipt by the Administrative Agent of customary opinions of legal counsel to the extent requested by the Administrative Agent. 

(c) Certified Resolutions. Receipt by the Administrative Agent of such certificates of resolutions or other action
of the Loan Parties authorizing and approving this Amendment. 
 (d) Assignment and Assumption. Each
Lender that will not execute this Amendment shall have assigned all of its rights and obligations under the Credit Agreement and the other Loan Documents (including all of its Commitments and the Loans) in accordance with Section 11.06(b) of
the Credit Agreement to a Lender that will execute this Amendment. 
 (e) Fees. Receipt by the
Administrative Agent, the Arranger and the Lenders of all fees required to be paid on or before the effective date of this Amendment. 

  
 9 

 4. Amendment is a “Loan Document”. This Amendment is a Loan Document and
all references to a “Loan Document” in the Credit Agreement and the other Loan Documents (including, without limitation, all such references in the representations and warranties in the Credit Agreement and the other Loan Documents) shall
be deemed to include this Amendment. 
 5. Representations and Warranties; No Default. Each Loan Party represents and
warrants to the Administrative Agent and each Lender that after giving effect to this Amendment, (a) the representations and warranties of each Loan Party contained in the Credit Agreement or any other Loan Document are true and correct in all
material respects on and as of the date hereof, except to the extent that such representations and warranties specifically refer to an earlier date, in which case such representations and warranties are true and correct in all material respects as
of such earlier date, and (b) no Default exists. 
 6. Reaffirmation of Obligations. Each Loan Party
(a) acknowledges and consents to all of the terms and conditions of this Amendment, (b) affirms all of its obligations under the Loan Documents and (c) agrees that this Amendment does not operate to reduce or discharge such Loan
Party’s obligations under the Loan Documents (except as expressly set forth in Section 2 above). 
 7.
Reaffirmation of Security Interests. Each Loan Party (a) agrees that, notwithstanding the effectiveness of this Amendment, the Security Agreement and each of the other Collateral Documents continue to be in full force and effect and are
not impaired or adversely affected in any manner whatsoever, (b) confirms its guaranty of the Obligations and its grant of a security interest pursuant to the Collateral Documents in its assets that constitute Collateral as collateral therefor,
all as provided in the Loan Documents as originally executed and (c) acknowledges that such guaranty and grant continues in full force and effect in respect of, and to secure, the Obligations under the Credit Agreement and the other Loan
Documents. 
 8. No Other Changes. Except as modified hereby, all of the terms and provisions of the Loan Documents shall
remain in full force and effect. 
 9. Counterparts; Delivery. This Amendment may be executed in counterparts (and by
different parties hereto in different counterparts), each of which shall constitute an original, but all of which when taken together shall constitute a single contract. Delivery of an executed counterpart of this Amendment by facsimile or other
electronic imaging means shall be effective as an original. 

  
 10 

 10. Governing Law. This Amendment shall be deemed to be a contract made under, and
for all purposes shall be construed in accordance with, the laws of the State of New York. 
 [SIGNATURE PAGES FOLLOW]

  
 11 

 IN WITNESS WHEREOF, the parties hereto have caused this Second Amendment to be duly
executed as of the date first above written. 
  

							
	BORROWER:	  	CACI INTERNATIONAL INC, a Delaware corporation
				
		  	By:	 	 /s/ Thomas A. Mutryn
	 	
			
		  	Name:	 	Thomas A. Mutryn
			
		  	Title:	 	Executive Vice President, Chief Financial Officer & Treasurer
		
	GUARANTORS:	  	CACI PRODUCTS COMPANY, a Delaware corporation
		
		  	CACI PRODUCTS COMPANY CALIFORNIA, a California corporation
		
		  	CACI, INC.-FEDERAL, a Delaware corporation
		
		  	CACI, INC.-COMMERCIAL, a Delaware corporation
		
		  	CACI TECHNOLOGIES, INC., a Virginia corporation
		
		  	CACI DYNAMIC SYSTEMS, INC., a Virginia corporation
		
		  	CACI PREMIER TECHNOLOGY, INC., a Delaware corporation
		
		  	CACI MTL SYSTEMS, INC., a Delaware corporation
		
		  	CACI SYSTEMS, INC., a Virginia corporation
		
		  	CACI-CMS INFORMATION SYSTEMS, INC, a Virginia corporation
		
		  	CACI ENTERPRISE SOLUTIONS, INC., a Delaware corporation
		
		  	R.M. VREDENBURG & CO., a Virginia corporation
		
		  	CACI-WGI, INC., a Delaware corporation
		
		  	CACI SECURED TRANSFORMATIONS, INC., a Florida corporation
		
		  	CACI-NSR, INC., a Delaware corporation
		
		  	CACI TECHNOLOGY INSIGHTS, INC., a Virginia corporation
		
		  	CACI-ATHENA, INC., a Delaware corporation
		
		  	BUSINESS DEFENSE AND SECURITY CORPORATION, a Virginia corporation

							
		  	CACI-ISS, INC., a Delaware corporation
		
		  	SYSTEMWARE INCORPORATED, a California corporation
		
		  	APPLIED SYSTEMS RESEARCH, INC., a Virginia corporation
		
		  	TECHNIGRAPHICS, INC., an Ohio corporation
		
		  	PANGIA TECHNOLOGIES, LLC, a Nevada limited liability company
				
		  	By:	 	 /s/ Thomas A. Mutryn
	 	
				
		  	Name:	 	Thomas A. Mutryn	 	
			
		  	Title:	 	Executive Vice President, Chief Financial Officer & Treasurer

 [SIGNATURE PAGES FOLLOW] 

					
	ADMINISTRATIVE AGENT:	 	BANK OF AMERICA, N.A., as Administrative Agent
			
		 	By:	 	 /s/ Roberto Salazar

			
		 	Name:	 	Roberto Salazar
			
		 	Title:	 	Vice President

 [SIGNATURE PAGES FOLLOW] 

							
	LENDERS:	 	BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swing Line Lender
				
		 	By:	 	 /s/ Michael T. Radcliffe
	 	
				
		 	Name:	 	Michael T. Radcliffe	 	
				
		 	Title:	 	Senior Vice President	 	
			
		 	JPMORGAN CHASE BANK, N.A.	 	
				
		 	By:	 	 /s/ Anthony Galea
	 	
				
		 	Name:	 	Anthony Galea	 	
				
		 	Title:	 	Vice President	 	
			
		 	SUNTRUST BANK	 	
				
		 	By:	 	 /s/ David Bennett
	 	
				
		 	Name:	 	David Bennett	 	
				
		 	Title:	 	Vice President	 	
			
		 	CITIZENS BANK OF PENNSYLVANIA	 	
				
		 	By:	 	 /s/ Sandra BVW Braun
	 	
				
		 	Name:	 	Sandra BVW Braun	 	
				
		 	Title:	 	SVP	 	

							
		 	WELLS FARGO BANK, NATIONAL ASSOCIATION
				
		 	By:	 	 /s/ Scott Santa Cruz
	 	
				
		 	Name:	 	Scott Santa Cruz	 	
				
		 	Title:	 	Managing Director	 	
		
		 	RBC BANK (USA)
				
		 	By:	 	  
	 	
				
		 	Name:	 		 	
				
		 	Title:	 		 	
		
		 	BRANCH BANKING AND TRUST COMPANY
				
		 	By:	 	 /s/ James E. Davis
	 	
				
		 	Name:	 	James E. Davis	 	
				
		 	Title:	 	Senior Vice President	 	
		
		 	PNC BANK, NATIONAL ASSOCIATION
				
		 	By:	 	 /s/ Bremmer Kneib
	 	
				
		 	Name:	 	Bremmer Kneib	 	
				
		 	Title:	 	Assistant Vice President	 	

 [SIGNATURE PAGES FOLLOW] 

							
		 	SUMITOMO MITSUI BANKING CORPORATION, NEW YORK
				
		 	By:	 	  
	 	
				
		 	Name:	 		 	
				
		 	Title:	 		 	
		
		 	MANUFACTURERS AND TRADERS TRUST COMPANY
				
		 	By:	 	  
	 	
				
		 	Name:	 		 	
				
		 	Title:	 		 	
		
		 	TD BANK, N.A.
				
		 	By:	 	 /s/ Louise Wager
	 	
				
		 	Name:	 	Louise Wager	 	
				
		 	Title:	 	Vice President	 	
		
		 	U.S. BANK NATIONAL ASSOCIATION
				
		 	By:	 	 /s/ Steven L. Sawyer
	 	
				
		 	Name:	 	Steven L. Sawyer	 	
				
		 	Title:	 	Vice President	 	

							
		 	CAPITAL ONE, N.A.
				
		 	By:	 	 /s/ Todd W. Rowley
	  	
				
		 	Name:	 	Todd W. Rowley	  	
				
		 	Title:	 	SVP	  	
		
		 	CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH
				
		 	By:	 	 /s/ Shaheen Malik
	  	 /s/ Michael Spaight

				
		 	Name:	 	Shaheen Malik	  	Michael Spaight
				
		 	Title:	 	Vice President	  	Associate
		
		 	THE NORTHERN TRUST COMPANY
				
		 	By:	 	 /s/ Michael Kingsley
	  	
				
		 	Name:	 	Michael Kingsley	  	
				
		 	Title:	 	Sr. Vice President	  	
		
		 	FIRST COMMONWEALTH BANK
				
		 	By:	 	 /s/ Lawrence C. Deihle
	  	
				
		 	Name:	 	Lawrence C. Deihle	  	
				
		 	Title:	 	SVP	  	

 [SIGNATURE PAGES FOLLOW] 

							
		 	TAIPEI FUBON COMMERCIAL BANK, CO., LTD.
				
		 	By:	 	 /s/ Bill Hwang
	 	
				
		 	Name:	 	Bill Hwang	 	
				
		 	Title:	 	First Vice President & General Manager	 	
		
		 	BANK LEUMI USA
				
		 	By:	 	  
	 	
				
		 	Name:	 		 	
				
		 	Title:	 		 	
		
		 	THE BANK OF EAST ASIA, LIMITED, NEW YORK BRANCH
				
		 	By:	 	  
	 	
				
		 	Name:	 		 	
				
		 	Title:	 		 	
		
		 	CHANG HWA COMMERCIAL BANK, LTD., NEW YORK BRANCH
				
		 	By:	 	 /s/ Eric Y.S. Tsai
	 	
				
		 	Name:	 	/s/ Eric Y.S. Tsai	 	
				
		 	Title:	 	V.P. & General Manager	 	

							
		 	ROYAL BANK OF CANADA	 	
				
		 	By:	 	 /s/ Richard Smith
	 	
				
		 	Name:	 	Richard Smith	 	
				
		 	Title:	 	Authorized SignatoryOmnibus Amendment

 Exhibit 10.91 
 OMNIBUS AMENDMENT 
 THIS OMNIBUS AMENDMENT (this
“Amendment”), dated as of August 10, 2010, is by and among Clean Coal Solutions, LLC, a Colorado limited liability company (“CCS”), AEC-NM, LLC, a Colorado limited liability company (“AEC-NM”), AEC-TH, LLC, a
Colorado limited liability company (“AEC-TH”), ADA-ES, Inc., a Colorado corporation (“ADA”) and GS RC INVESTMENTS LLC, a Delaware limited liability company (“Goldman”). CCS, AEC-NM, AEC-TH, ADA and Goldman are sometimes
referred to herein, collectively, as the “Parties” and, individually, as a “Party”. 
 WHEREAS, CCS, AEC-NM,
AEC-TH and Goldman entered into that certain Agreement to Lease, dated as of June 29, 2010 (the “Agreement to Lease”); 
 WHEREAS, each of AEC-NM and AEC-TH entered into an Equipment Lease with Goldman, dated as of June 29, 2010 (collectively, the “Equipment Leases”); 

WHEREAS, CCS, ADA and Goldman entered into a Technology Sublicense Agreement, dated as of June 29, 2010 (the “Technology
Sublicense Agreement”); 
 NOW, THEREFORE, in consideration of the premises and of the mutual promises, covenants and
agreements contained herein, and for other valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties agree as follows: 
 1. Amendments to Agreement to Lease. CCS, AEC-NM, AEC-TH and Goldman hereby agree to amend the Agreement to Lease as follows: 

(a) Section 9.1(a) of the Agreement to Lease is hereby deleted and the following is substituted in lieu thereof: 

“Each Party shall maintain the terms of this Agreement in confidence and shall not disclose any information concerning the terms,
performance or administration of this Agreement to any other Person; provided that a Party may disclose such information: (i) to any of such Party’s Group, (ii) to any prospective member of such Party’s Group, (iii) to any
actual or prospective purchaser of all or a portion of such Party’s interest in the Facilities and (iv) to any Person providing or evaluating a proposal to provide financing to the recipient Party or any direct or indirect owner of such
Party; provided in each case that the recipient Party shall provide to each Person to which disclosure is made a copy of this Section 9.1 and direct such Person to treat such information confidentially, and the recipient Party shall be liable
for any breach of the terms of this Section 9.1 by such Persons to which it makes any such disclosure. The foregoing restrictions will not apply (A) to information that is or becomes generally available to the public otherwise than as a
result of disclosure by the recipient Party, (B) to information that is already in, or subsequently comes into, the recipient Party’s possession, provided that the source of such information was not, to the recipient Party’s
knowledge, obligated to keep such information confidential, (C) to information that is required to be disclosed pursuant to 

  

 
Law or stock exchange rules and regulations or is otherwise subject to legal, judicial, regulatory or self-regulatory requests for information or documents or (D) subject to
Section 9.1(b) below, to the tax structure or tax treatment of the transaction.” 
 (b) The following is hereby added
to Annex I of the Agreement to Lease where alphabetically appropriate as a new defined term: 
 “Group” means,
with respect to any Party, such Party and (a) the Affiliates of such Party; (b) each guarantor of such Party; (c) any other members, shareholders, partners or other equity owners of such Party or any of its Affiliates (other than
holders of publicly-traded units of such Party or of any of its Affiliates, except any such holder that controls such Party), and (d) the respective successors, assigns and Representatives of each Person described in the foregoing clause (a),
(b) or (c), but shall in no event include the other Parties’ respective Groups. 
 2. Amendments to Equipment
Leases. AEC-NM (as applicable), AEC-TH (as applicable) and Goldman hereby agree to amend each of the Equipment Leases by deleting Section 6.1(a) in its entirety and substituting the following in lieu thereof:: 

“Each Party shall maintain the terms of this Lease in confidence and shall not disclose any information concerning the terms,
performance or administration of this Lease to any other Person; provided that a Party may disclose such information: (i) to any of such Party’s Group, (ii) to any prospective member of such Party’s Group, (iii) to any
actual or prospective purchaser of all or a portion of such Party’s interest in the Facility and (iv) to any Person providing or evaluating a proposal to provide financing to the recipient Party or any direct or indirect owner of such
Party; provided in each case that the recipient Party shall provide to each Person to which disclosure is made a copy of this Section 6.1 and direct such Person to treat such information confidentially, and the recipient Party shall be liable
for any breach of the terms of this Section 6.1 by such Persons to which it makes any such disclosure. The foregoing restrictions will not apply (A) to information that is or becomes generally available to the public otherwise than as a
result of disclosure by the recipient Party, (B) to information that is already in, or subsequently comes into, the recipient Party’s possession, provided that the source of such information was not, to the recipient Party’s
knowledge, obligated to keep such information confidential, (C) to information that is required to be disclosed pursuant to Law or stock exchange rules and regulations or is otherwise subject to legal, judicial, regulatory or self-regulatory
requests for information or documents or (D) subject to Section 6.1(b) below, to the tax structure or tax treatment of the transaction.” 
 3. Amendment to Technology Sublicense Agreement. ADA, CCS and Goldman hereby agree to amend the Technology Sublicense Agreement as follows: 

(a) Section 9.1 of the Technology Sublicense Agreement is hereby deleted and the following is substituted in lieu thereof:

 “Each Party shall maintain the terms of this Agreement in confidence and shall not disclose any information concerning
the terms, performance or administration of this 

  
 2 

 
Agreement to any other Person; provided that a Party may disclose such information: (a) to any of such Party’s Group, (b) to any prospective member of such Party’s
Group, (c) to any actual or prospective purchaser of all or a portion of such Party’s interest in the Facilities and (d) to any Person providing or evaluating a proposal to provide financing to the recipient Party or any direct or
indirect owner of such Party; provided in each case that the recipient Party shall provide to each Person to which disclosure is made a copy of this Section 9 and direct such Person to treat such information confidentially, and the
recipient Party shall be liable for any breach of the terms of this Section 9 by such Persons to which it makes any such disclosure. The foregoing restrictions will not apply (i) to information that is or becomes generally available to the
public otherwise than as a result of disclosure by the recipient Party, (ii) to information that is already in, or subsequently comes into, the recipient Party’s possession, provided that the source of such information was not, to the
recipient Party’s knowledge, obligated to keep such information confidential and the information was not received solely pursuant to a previous agreement between the Parties , (iii) to information that is required to be disclosed pursuant
to Law or stock exchange rules and regulations or is otherwise subject to legal, judicial, regulatory or self-regulatory requests for information or documents, or (iv) subject to Section 9.2 below, to the tax treatment or tax structure of
the transaction.” 
 (b) The following are hereby added to Article I of the Technology Sublicense Agreement where
alphabetically appropriate as new defined terms: 
 “Group” means, with respect to any Party, such Party and
(a) the Affiliates of such Party; (b) each guarantor of such Party; (c) any other members, shareholders, partners or other equity owners of such Party or any of its Affiliates (other than holders of publicly-traded units of such Party
or of any of its Affiliates, except any such holder that controls such Party), and (d) the respective successors, assigns and Representatives of each Person described in the foregoing clause (a), (b) or (c), but shall in no event include
the other Parties’ respective Groups. 
 “Representative” means, with respect to any Person, each manager,
director, officer, employee, agent, consultant (including consulting engineers), advisor (including counsel and accountants), and other representative of such Person. 
 4. The provisions of the Agreement to Lease, the Equipment Leases and the Technology Sublicense Agreement, each as amended hereby, shall remain in full force and effect and the applicable Parties hereby
ratify, confirm and adopt all the terms and provisions of each of the Agreement to Lease, the Equipment Leases and the Technology Sublicense Agreement, as amended hereby. 
 5. This Amendment shall constitute the entire agreement between the Parties hereto relating to the amendment of the Agreement to Lease, the Equipment Leases and the Technology Sublicense Agreement. No
modification of this Amendment or waiver of any provision hereof shall be binding unless the modification or waiver shall be in writing and signed by the Parties to be bound. This Amendment expressly supersedes all prior agreements between the
Parties relating to the amendment of the Agreement to Lease, the Equipment Leases and the Technology Sublicense Agreement. 

  
 3 

 6. This Amendment may be executed and delivered (including by facsimile transmission) in one
or more counterparts, all of which shall be considered one and the same agreement and shall become effective when one or more counterparts have been signed by each of the Parties and delivered to the other Parties, it being understood that all
Parties need not sign the same counterpart. 
 [SIGNATURE PAGES FOLLOW] 

  
 4 

 IN WITNESS WHEREOF, this Amendment has been signed by each of the Parties as of the
date first above written. 
  

			
	CLEAN COAL SOLUTIONS, LLC
		
	By:	 	/s/ Brian Humphrey
	Name:	 	Brian Humphrey
	Title:	 	Manager

  

			
	AEC-NM, LLC
		
	By:	 	 Clean Coal Solutions, LLC,

its managing member

		
	By:	 	 /s/ Brian Humphrey

	Name:	 	 Brian Humphrey

	Title:	 	 Manager

  

			
	AEC-TH, LLC
		
	By:	 	 Clean Coal Solutions, LLC,

its managing member

		
	By:	 	/s/ Brian Humphrey
	Name:	 	Brian Humphrey
	Title:	 	Manager

 SIGNATURE PAGE TO AMENDMENT 

  

 
			
	ADA-ES, INC.
		
	By:	 	/s/ Mark H. McKinnies
	Name:	 	Mark H. McKinnies
	Title:	 	Senior Vice President and Chief Financial Officer

  

			
	GS RC INVESTMENTS LLC
		
	By:	 	 GSFS INVESTMENTS I CORP.,

its sole member

		
	By:	 	/s/Donald Dombrowski
	Name:	 	Donald Dombrowski
	Title:	 	Authorized Signatory

 SIGNATURE PAGE TO AMENDMENT

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