INVITATION FOR BIDS (IFB)
No. PCCD-22-PCW21Rehab-01
December 9, 2021

REHABILITATION
of
Plum Creek Watershed
Floodwater Retarding Structure Site 21
Caldwell County, Texas
Contracting Local Organization
Plum Creek Conservation District
Lockhart, Texas
Sponsors
Caldwell-Travis Soil and Water Conservation District
Hays County Soil and Water Conservation District
Plum Creek Conservation District

In cooperation with:
U. S. Dept of Agriculture, Natural Resources Conservation Service
Texas State Soil and Water Conservation BoardPLAN HOLDER REGISTRATION FORM / TERMS & CONDITIONS
Invitation for Bids (IFB) No. PCCD-22-PCW21Rehab-01
Plum Creek Watershed, Floodwater Retarding Structure Site 21 – Rehabilitation
It is the responsibility of all persons who download bid documents to REGISTER as a Plan Holder with
the Plum Creek Conservation District (PCCD). Registered Plan Holders will be advised via email orother means of all IFB Amendments that are issued, and all Amendments will be available fordownloading at the Plum Creek Conservation District website: https://pccd.org (Job Bids tab). A
bidder’s failure to acknowledge receipt of an IFB Amendment (see IFB PART I, Subpart B, Instructions
to Bidders) may result in rejection of the sealed bid.
TO REGISTER, please fill out information below (all fields are mandatory) and submit form via:
FAX to 512-398-7776 (Attention: Daniel Meyer, PCCD Executive Manager)-- or -Scan and EMAIL completed form to both of the following email addresses:
daniel.meyer@pccd.org
jamaynard1@msn.com
SIGNATURE (Contact Person listed below): _________________________________________
Company Name:___________________________________________________________

Contact Person/Title: ___________________________________________________________
Mailing Address:___________________________________________________________

Physical Address:___________________________________________________________

Office Phone: __________________ Mobile: __________________ FAX: ________________
Email Address:___________________________________________________________

Bid documents for this project may be downloaded from this site, for bidding purposes only, if the User
agrees, without exception, to the following terms and conditions:
The User agrees that electronic media documents downloaded from this site are for their use inpreparation of their bid and are offered as a convenience to the User. Use of these materials for any
other purpose shall be without liability to Plum Creek Conservation District and their consultants. The
User acknowledges and agrees that Plum Creek Conservation District’s instruments of service are theprinted hard copy (as amended) of the Invitation for Bids issued for the respective project as available
for viewing at the Plum Creek Conservation District office. In the event of a conflict in their contents,
the printed hard copy shall take precedence over the electronic media. Plum Creek Conservation
District’s electronic media are furnished without guarantee of compatibility with the bidder’s software or
hardware. It is the User's responsibility to determine/evaluate the capability of their equipment toprovide documents that are accurate for size, scale, and content.
If the User elects to only download partial information (selected sheets of the drawings or pages of thespecifications), they shall be responsible to obtain all pertinent bidding information to adequately andaccurately prepare their bid proposal. The User is responsible to include in their proposal all of theRequired Bid Information as specified in IFB PART I, Subpart B, Instruction to Bidders #3.
The User agrees to indemnify, defend and hold harmless the Plum Creek Conservation District, theirconsultants and the officers and employees and any of them from and against any and all claims, suits,losses, damages or costs, including attorney’s fees, arising from or by reason of the User’s use of theseelectronic media documents.

IFB No. PCCD-22-PCW21Rehab-01

Table of Contents

TABLE OF CONTENTSIFB NO. PCCD-22-PCW21Rehab-01

PAGE NO.
PART I – GENERAL PROVISIONS
Subpart A Notice to Bidders

GP-1

Subpart B Instructions to Bidders

GP-2

Subpart C BID FORMS (Exhibits A-E)

GP-7

Subpart D Sample Contract Agreement

GP-20

PART II – GENERAL CONDITIONS

GC 1-18

PART III – SUPPLEMENTAL CONDITIONS

SC 1-18

PART IV – SPECIFICATIONS
Construction and Material Specifications

PART V – DRAWING NO TX-EN-0754
COVER + 83 sheets

PART VI – PREVAILING WAGE RATES DETERMINATION
Wage rates listing: 1 PageIFB No. PCCD-22-PCW21Rehab-01

Page GP-1 of 21

PART I – GENERAL PROVISIONSSUBPART A
NOTICE TO BIDDERS
Sealed bids for furnishing all labor, material and equipment and performing all work required forrehabilitation of Plum Creek Watershed, Floodwater-Retarding Structure Site 21 will be received until
10:00 a.m. local time, Wednesday, January 19, 2022, at Plum Creek Conservation District (PCCD)
office, 1101 West San Antonio Street, Lockhart, TX 78644, or may be mailed to this address. Promptly
after 10:00 a.m. all bids received will be publicly opened.
Bids must be addressed to the attention of Daniel Meyer, PCCD Executive Manager, and mailed (or handcarried) to the above address in a sealed envelope (placed inside the mailing envelope, if any) labeled asfollows:
(1)
(2)
(3)

IFB No. PCCD-22-PCW21Rehab-01
Bid Opening Date / Time: January 19, 2022 – 10:00 A.M.
Name and Address of Bidder

There will be a pre-bid conference beginning at 9:30 a.m. Thursday, January 6, 2022, to be held at
PCCD office, 1101 West San Antonio Street, Lockhart, Texas. The conference will be followed by a site
showing of the project site. Attendance is not mandatory. However, prospective bidders are HIGHLY
ENCOURAGED to attend the conference and site showing.
All bids require a bid guarantee in the amount of not less than five percent (5%) of the total bid.
Requirements are outlined in PART I, Subpart B, Instructions to Bidders. The successful bidder will be
required to submit payment and performance bonds within 5 (five) workdays after receipt of Notice ofAward per PART III, Supplemental Conditions, Article 13.
ESTIMATED PRICE RANGE: Between $5,000,000 and $10,000,000
Plum Creek Conservation District reserves the right to reject any and all bids. Bids providing less than
30 calendar days for acceptance will not be considered and will be rejected. Telegraphic or facsimile(Fax) bids, modifications, or withdrawals are not authorized.
Plum Creek Conservation District is the Contracting Local Organization (CLO) responsible for soliciting
and awarding a local contract for this project. The contract is receiving Federal funding from the U.S.
Department of Agriculture, Natural Resources Conservation Service, under the Watershed Protection andFlood Prevention Act of 1954, Public Law 83-566 (as amended) and as further amended by the Small
Watershed Rehabilitation Amendments of 2000 (Section 313, P.L. 106-472). The contract also isreceiving State funding from the Texas State Soil and Water Conservation Board.
COVID-19 Alert: Anyone entering the PCCD office building is encouraged to follow guidelines of the CDC.
By entering those attending will represent to PCCD that they are aware of CDC recommendations to avoid
the spread of the Virus and, to the extent possible, are compliant with the recommendations; that they are
not having symptoms of the Virus as described by the CDC and/or the Texas Department of State HealthServices; and have not knowingly been in contact with others who have such symptoms.

PLUM CREEK CONSERVATION DISTRICTIFB No. PCCD-22-PCW21Rehab-01

Page GP-2 of 21

PART I – GENERAL PROVISIONSSUBPART B
INSTRUCTIONS TO BIDDERS
1. Submission of Bids / Bid Opening: Bids in response to this Invitation for Bids (IFB) must be sealed,marked and addressed as directed in the Notice to Bidders. Failure to do so may result in a premature
opening of, or a failure to open, such bid. Bids will be publicly opened at the time set for opening in the
Notice to Bidders. Their content will be made public for the information of bidders and others interested,
who may be present either in person or by representative.
2. Conditions Affecting the Work: Bidders should visit the site and take such other steps as may bereasonably necessary to ascertain the nature and location of the work, and the general and local
conditions which can affect the work or the cost thereof. Failure to do so will not relieve bidders from
responsibility for estimating properly the difficulty or cost of successfully performing the work. The
Contracting Local Organization will assume no responsibility for any understanding or representations
concerning conditions made by any of its officers or agents prior to execution of the contract, unlessincluded in the invitation for bids, the specifications, or related documents.
NO digging or taking of core samples will be allowed. Persons visiting the site are asked to take due
care to ensure the existing site conditions are not disturbed.
Appointment Required to Visit the Project Site: Please contact Daniel Meyer, PCCD Executive
Manager (phone 512-398-2383) to make an appointment for an authorized person to accompany you tothe project site. No unescorted visits to the site are allowed.
3. Required Bid Information: Forms which must be included in a bid are:(a)

Exhibit A: Offer with appropriate 5% BID GUARANTEE.

(b)

Exhibit B: Bid Schedule.

(c)

Exhibit C: References.

(d)

Exhibit D: Bid Bond form.
If a bid bond is submitted as the required bid guarantee, it must be executed on this form and in
conformance with other requirements in these Instructions to Bidders.

(e)Exhibit E: Bidder Certifications.
Bidder must complete all applicable certifications and include in his/her bid.

4. Preparation of Bid: The bidder must submit his/her offer IN DUPLICATE (original plus one copy) on
the forms furnished in this IFB, and the bid must be manually signed by a person or persons with authority
to legally bind the individual, firm or corporation. If erasures or other changes appear on the forms, eacherasure or change must be initialed by the person signing the bid. Facsimile (Fax) and telegraphic bids,
modifications, or withdrawals will not be considered.
No bid will be considered unless all items in the bid schedule are priced. In case of error in the extensionof price, the unit price shall govern. For other than bid items with a lump-sum “unit,” the quantities listed
in the bid schedule on which unit prices are requested are estimates only. Unless called for, alternate
bids will not be considered.
Estimated Price Range: Between $5,000,000 and $10,000,000
Exemption from State, County, and Municipal Sales and Use Taxes. See Part II – General Conditions,
Article 29 (Federal, State, and Local Taxes), paragraph (b). Bidders are entitled to EXCLUDE exempt
taxes in their bid prices. Bidder is solely responsible to determine what tangible personal property andtaxable services are eligible for exemption from these taxes.

IFB No. PCCD-22-PCW21Rehab-01

Page GP-3 of 21

Electronic Invitation for Bid (IFB) Documents. The IFB documents and IFB Amendments are available
to interested parties electronically only, and no printed copies will be distributed. The Plum Creek
Conservation District’s instruments of service are the printed hard copy of the IFB (as amended) available
for viewing at the Plum Creek Conservation District office. In the event of a conflict in their contents, theprinted hard copy (as amended) shall take precedence over the electronic media. Plum Creek
Conservation District’s electronic media are furnished without guarantee of compatibility with the bidder’ssoftware or hardware. It is the user’s responsibility to determine/evaluate the capability of their equipment
to provide documents that are accurate for size, scale, and content. If an alteration of any kind to the
CLO’s printed hard copy IFB (as amended) is only discovered after the contract is executed and is or is
not being performed, the contract is subject to immediate cancellation. Website to obtain documents(Adobe PDF format) is:www.pccd.org
Click on Job Bids tab; then on IFB No. PCCD-22-PCW21Rehab-01,
Plum Creek Watershed SITE 21 Rehabilitation
5. Submission of Offer in English Language/U.S. Currency: Offers shall be in the English language
and in terms of U. S. dollars or will be rejected.
6. Explanation to Bidders / Inquiries: Any explanation desired by a bidder regarding the meaning orinterpretation of the invitation for bids, drawings, specifications, etc., must be requested in writing andwith sufficient time allowed (by noon on January 12, 2022) for a reply to reach bidders before thesubmission of their bids. Any interpretation made will be in the form of an amendment to the invitation
for bids, drawings, specifications, etc., and each Amendment will be available electronically. The CLO
will make a reasonable attempt to advise (via email or other method) all prospective bidders who haveregistered as a bid documents holder or that may otherwise be known to have received a copy of the bid
documents when an IFB Amendment is available electronically. However, it is the bidder’s responsibility
to check the electronic bid documents website for any changes or additions to the documents originallyposted. Receipt of all amendments must be acknowledged by the bidder in the space provided on thebid forms (PART I, Subpart C, Exhibit A, Offer) or by letter received before the time set for opening ofbids (electronic, Fax, and telegraphic acknowledgements will not be accepted). All amendments will bebound with and made a part of the contract documents. Oral explanations or instructions given before
the award of the contract will not be binding. Written requests shall be mailed, hand delivered, or sent
via facsimile machine or email (telegraphic inquiries will not be accepted) to :Daniel Meyer, Executive Manager, Plum Creek Conservation
District, 1101 West San Antonio Street, Lockhart, TX 78644
FAX #: 512-398-7776
EMAIL: daniel.meyer@pccd.org"Facsimile," as used in this section means a written inquiry or request for explanation that is transmitted
to and received by the Contracting Local Organization (CLO) via electronic equipment that communicatesand reproduces both printed and handwritten material. Facsimile receiving data and compatibility
characteristics are as follows: (a) Telephone number of receiving facsimile equipment: 512-398-7776.
(b) If you choose to transmit a facsimile inquiry, the CLO will not be responsible for any failure attributable
to the transmission or receipt of the facsimile inquiry including, but not limited to, the following: (1) Receipt
of garbled or incomplete inquiry. (2) Availability or condition of the receiving facsimile equipment. (3)Incompatibility between the sending and receiving equipment. (4) Delay in transmission or receipt of theinquiry. (5) Failure of the sender to properly identify the inquiry. (6) Illegibility of the inquiry.
7. Bid Guarantee: As a good faith deposit to ensure execution of a contract, each offer must be
accompanied by a bid guarantee in the form of a certified or cashier’s check (on a responsible bank in
Texas) or bid bond, in the amount of not less than five percent (5%) of the total bid. Bid guarantee is to
be made payable to: PLUM CREEK CONSERVATION DISTRICT. Bid guarantees, other than bid bonds,
will be returned (a) to all bidders (except the three most qualified) within 3 days of the bid opening, and(b) to the three most qualified bidders upon execution by the most qualified bidder of such further
contractual documents and bonds as may be required by the bid as accepted. When a bid guarantee is

IFB No. PCCD-22-PCW21Rehab-01

Page GP-4 of 21

required, failure to furnish a bid guarantee in the proper form and amount, by the time set for opening ofbids, may be cause for rejection of the bid.
Should the bidder to whom the contract is awarded fail or refuse to enter into a proper contract with the
CLO, or fail or refuse to furnish the payment and performance bonds required by PART III, Article 13, or
fail or refuse to provide additional Post-Award Information required by PART III, Article 4, within the time
specified, the bidder forfeits the bid guarantee, and/or the CLO may pursue any other action allowed bylaw.
8. Bid Bond Requirements: Bond must be executed on the form provided (PART I, Subpart C. Exhibit D)
by a corporate surety authorized and admitted to write surety bonds in the State of Texas. The surety
must (i) hold a certificate of authority from the United States Secretary of the Treasury to qualify as asurety on obligations permitted or required under federal law; or (ii) have obtained reinsurance for any
liability in excess of $1,000,000 from a reinsurer that is an authorized reinsurer in the State of Texas oris a holder of a certificate of authority from the United States Secretary of the Treasury to qualify as asurety or reinsurer on obligations permitted or required under federal law. U.S. Treasury Department
Circular 570 is published in the Federal Register and lists Treasury approved surety companies and theirunderwriting limitations. All bonds signed by an agent must be accompanied by a certified copy of suchagent’s authority to act. The original and one copy of bid bond shall be submitted with the bid.
9. Late Submissions, Modifications, and Withdrawals of Bids:(a) Any bid received at the office designated in the solicitation after the exact time specified for receipt
will not be considered and will be returned to the bidder unopened.
(b) Any modification or withdrawal of a bid is subject to the same conditions as in paragraph (a) of thisprovision.
(c) The only acceptable evidence to establish the time of receipt at the Contracting Local Organization
installation is the time/date stamp of that installation on the bid wrapper or other documentary
evidence of receipt maintained by the installation.
(d) Notwithstanding paragraph (a) of this provision, a late modification of an otherwise successful bidthat makes its terms more favorable to the Contracting Local Organization will be considered at any
time it is received and may be accepted.
(e) Bids may be withdrawn by written notice received at any time before the exact time set for receipt
of bids. A bid may be withdrawn in person by a bidder or its authorized representative if, before theexact time set for receipt of bids, the identity of the person requesting withdrawal is established andthe person signs a receipt for the bid.
(f) If an emergency or unanticipated event interrupts normal Contracting Local Organization processes
so as to cause postponement of the scheduled bid opening, and urgent Contracting Local
Organization requirements preclude amendment of the solicitation or other notice of an extensionof the opening date, the time specified for receipt of bids will be deemed to be extended to the sametime of day specified in the solicitation on the first work day on which normal Contracting Local
Organization processes resume.
10. Tie Bid: In the event of receipt of two or more bids from responsible bidders that are identical, in nature
and amount, as the lowest and best bids, the Contracting Local Organization shall enter into a contract
with only one of those bidders and must reject all other bids. The bidder shall be selected by the castingof lots in a manner prescribed by the Contracting Local Organization. All qualified bidders or their legal
representatives may be present at the casting of lots. This provision does not prohibit the Contracting
Local Organization from rejecting all bids.
11. Qualification of Low Bidder:(a)After the low bidder has been determined, the next step is to consider the bidder’s qualifications
to perform the proposed contract. The award of a contract to a bidder solely on the basis of thelowest price is not the policy of the Contracting Local Organization. The ability to obtain bonds
does not necessarily qualify a bidder for award.

IFB No. PCCD-22-PCW21Rehab-01

Page GP-5 of 21(b)

A contract may be awarded only after it has been determined that the bidder is qualified to performthe contract. Qualification reviews will be made of all pertinent factors including: financial
resources or ability to obtain them; present or impending work commitments; record of past
performance on comparable projects; business ethics and integrity; eligibility to receive an award
under applicable laws and regulations; the necessary organization, experience, operational
controls and technical skills or the ability to obtain them; and the necessary equipment or ability toobtain it, as may be needed to prosecute the work in an expeditious, safe and satisfactory manner.

(c)

If the bidder does not have adequate equipment but plans to obtain it after contract award, a firm
commitment in writing from the suppliers must be furnished to the Contracting Local Organization.
Also, if the bidder proposes to subcontract part of the work, they must provide information needed
for the Contracting Local Organization’s evaluation of the subcontractor’s capability.

(d)

Before disqualifying the low bidder, the Contracting Local Organization will inform the bidder of thereason for the proposed disqualification.

12. Disqualification of Bidders: Listed are some of the causes which may be considered as sufficient forthe disqualification of a bidder and the rejection of his/her offer:(a)Failure to conform to the essential requirements of the invitation for bids (e.g., incomplete offer)
will result in rejection of the bid.
(b)
Bids from parties who are presently debarred, suspended, proposed for debarment, declaredineligible, or voluntarily excluded from participation in this transaction by any Federal department
or agency, or from party presently on the State of Texas debarred vendor list maintained by the
Texas Comptroller of Public Accounts, will be rejected. [See certifications in PART I, Subpart C,
Exhibit E, Section G-1 and G-2.](c)More than one offer for the same work from the same individual, firm, partnership or corporation.
(d)Qualifying statements or accompanying qualifying letters that modify requirements or limit thebidder’s liability will be cause for rejection of bid.
(e)Evidence of collusion among bidders.
(f)Poor performance in the execution of work under previous contracts, as determined by theContracting Local Organization.
(g)Being in arrears on existing contracts, in litigation with the Contracting Local Organization, or
having defaulted on a previous contract.
(h)
Lack of comparable project experience.
(i)
The bid is materially unbalanced. I.e., a bid based on prices significantly less than cost for somework and prices which are significantly overstated in relation to cost for other work, and there isreasonable doubt that the bid will result in the lowest overall cost to the Contracting Local
Organization even though it may be the low evaluated bid.
13. Submission of Post-award Information: Within five (5) workdays after receipt of Notice of Award,
Contractor will be required to submit post-award information as specified in PART III, Supplemental
Conditions, Article 4.
14. Award of Contract: Award of contract will be made to that responsible bidder whose bid, conforming to
the invitation for bids (IFB), is most advantageous to the Contracting Local Organization, price and otherfactors considered. The Contracting Local Organization may, when in its interest, reject any or all bids
or waive informalities or minor irregularities in bids received. Only one contract will be awarded and theaward will be based on the total bid, corrected if necessary, for errors in price extensions and/or addition.
A response to an IFB is an offer to contract with the Contracting Local Organization based upon theterms, conditions and specifications contained in the IFB. Bids do not become contracts until a signed
Notice of Award (NOA) is issued by the Contracting Local Organization.
15. Officials Not to Benefit: Any contract to be awarded as a result of this solicitation will not be awarded
to any official of the USDA Natural Resources Conservation Service, Texas State Soil and Water
Conservation Board, Plum Creek Conservation District, Hays County Soil and Water Conservation
District (SWCD), or Caldwell-Travis SWCD, (all in the State of Texas), or to any firm in which any official

IFB No. PCCD-22-PCW21Rehab-01

Page GP-6 of 21

or any member of such official’s immediate family of these entities has direct or indirect interest in thepecuniary profits or contracts of such firms.
16. Execution of Contract and Submission of Post-award Information: The contract will include items
outlined in PART I, Subpart D, Contract Agreement, Article IV. Within five (5) workdays after receipt of
Notice of Award of the contract, the successful bidder shall execute the contract agreement and furnish
the Contracting Local Organization with required post-award information as outlined in PART III,Supplemental Conditions, Article 4.
17. Approval of Contract: The contract will be approved and signed by the Plum Creek Conservation
District President. The contract will not be binding upon the Contracting Local Organization until it has
been executed by Plum Creek Conservation District and delivered to the Contractor.
18. Specifications: Specifications referred to but not included shall include all revisions and amendmentsin effect on the date of issuance of the IFB.
19. Beginning of Work: The Contractor shall commence work within twenty (20) calendar days after receipt
of a written Notice to Proceed as issued by the Contracting Officer and shall complete the work within
573 (five hundred seventy-three) calendar days after receipt of the notice. Contractor shall notcommence any work prior to issuance of the Notice to Proceed.
20. Records: Records listed below may be reviewed by interested parties at Plum Creek Conservation
District, 1101 West San Antonio Street, Lockhart, Texas, by contacting Daniel Meyer or Karen Bridges(512-398-2383). Records may be viewed 8:00 a.m. to 5:00 p.m. (closed noon to 1:00 p.m.), Monday
through Friday.
Complete official printed copy of IFB No. PCCD-22-PCW21Rehab-01 bid package, including22” x 34” set of Drawing No. TX-EN-0754.
Engineering documents for viewing (also available on PCCD website):•

As-Built drawings of original dam construction, Drawing No. 4-E-15,942, cover andsheets 1-9, construction completed 7/13/1962. (Sheet behind cover page is 1968
modification to principal spillway inlet.)•Soil Mechanics Reportso 1961, NRCS, 14 pages
o 2015, NRCS, 57 pages
o 2021 AECOM, 101-page pdf file plus Appendices A thru L•

Geologic Investigation Reportso 1961, NRCS, 13 pages
o 2014, NRCS, 28 pages
o 2021, AECOM, 203-page pdf fileIFB No. PCCD-22-PCW21Rehab-01

Page GP-7 of 21

PART I – GENERAL PROVISIONSSUBPART C

BID FORMS
Exhibits A through E

IFB No. PCCD-22-PCW21Rehab-01

Page GP-8 of 21

EXHIBIT A

OFFER
Enclosed with this offer (Exhibits A through E) is a bid guarantee (bid bond or cashier’s or certified checkpayable

to

PLUM

CREEK

CONSERVATION

DISTRICT)intheamountof$___________________________. It is agreed that in the event this offer is accepted by the Contracting
Local Organization (CLO) and the undersigned bidder fails to execute a contract and submit required postaward information within five (5) workdays after receipt of Notice of Award of contract to him/her, the bidder
forfeits the bid guarantee and the CLO may pursue any other action allowed by law. If this offer is accepted,
the undersigned bidder agrees to execute a contract and submit required post-award information per contract
terms, and also agrees to commence work within twenty (20) calendar days after the date of receipt of written
Notice to Proceed and to complete the entire works awarded under IFB No. PCCD-22-PCW21Rehab-01
within five hundred seventy-three (573) calendar days commencing the day after Contractor receives written
Notice to Proceed.
The undersigned acknowledges receipt of the following amendments:
Amendment No. 1 dated _________________ Received _______________________
Amendment No. 2 dated _________________ Received _______________________
Amendment No. 3 dated _________________ Received _______________________
Amendment No. 4 dated _________________ Received _______________________

CONTRACTOR

By_________________________________
Print name:__________________________
Title:_______________________________________________________________
Secretary,
If Contractor is a Corporation(SEAL)

Address:__________________________________________________________________________________________________
Date: ______________________________IFB No. PCCD-22-PCW21Rehab-01

Page GP-9 of 21

EXHIBIT B

BID SCHEDULE (Cover Sheet)
The undersigned, in compliance with Invitation for Bids No. PCCD-22-PCW21Rehab-01 for Plum Creek
Watershed, Floodwater Retarding Structure (FRS) Site 21 Rehabilitation, Caldwell County, Texas, having
examined the plans, specifications and bidding documents, the site of the proposed work, and being familiar
with all the conditions surrounding performance of the proposed project; agrees to furnish all labor, material
and equipment and perform all work required in accordance with the plans, specifications and contract
documents for the prices below, if this offer is accepted by the Contracting Local Organization within ______
calendar days after the date bids are due. [Note: Failure to insert a number means the bidder accepts theminimum forty-five (45) calendar days as required in Notice to Bidders.]
Award Restriction
One award for the aggregate for all bid items will be made under this solicitation.
For other than bid items with a lump-sum “unit,” the quantities listed in the bid schedule on which unit prices
are requested are estimates only.

-- Bidders are entitled to EXCLUDE exempt taxes in their bid prices -[See PART I, Subpart B, Instructions to Bidders #4]

TOTAL BID PRICE Site 21 Rehabilitation:
In FIGURES:$______________________________________________________________In WORDS:_______________________________________________________________ Dollars
and _____________________________ Cents

NOTE: AMOUNTS SHALL BE SHOWN IN BOTH WORDS AND FIGURES. IN
CASE OF DISCREPANCY, THE AMOUNT SHOWN IN WORDS WILL GOVERN.

Bidder’s Name/Title (type or print): _______________________________________
Bidder’s Signature: _____________________________________________________
Company Name: _______________________________________________________
D – U – N – S Number (if available): _______________________________________
Date: ________________________________________IFB No. PCCD-22-PCW21Rehab-01

Page GP-10 of 21

EXHIBIT B (continued)

BID SCHEDULE (Sheet 1 of 3)
PLUM CREEK WATERSHED SITE 21 REHABILITATION
Caldwell County, Texas___________________________________________________________________________________________________________________________________

Item
No.

Work or Material

Spec.
No. Quantity

Unit
Price

ExtendedAmountAcre$_________$_________________

Unit

1

Clearing and Grubbing

2

3.7

2

Structure Removal,
Existing Fences

3

1 Job

Lump Sum$ xxxxxxxx$_________________

3

Structure Removal,
Existing Principal Spillway

3

1 Job

Lump Sum$ xxxxxxxxx$_________________

4

Pollution Control

5

1 Job

Lump Sum$ xxxxxxxxx$_________________

5

Silt Fence

5

5,108

Lin. Ft.

$_________$_________________

6

Vegetation, Sprigging

6

40.9

Acre

$_________$_________________

7

Irrigation System

6

1 Job

Lump Sum$ xxxxxxxxx$_________________

8

Irrigation Water

6

3,000

1,000 Gal.

$_________$_________________

9

Construction Surveys

7

1 Job

Lump Sum$ xxxxxxxxx$_________________

10

Mobilization and
Demobilization

8

1 Job

Lump Sum$ xxxxxxxxx$_________________

11

Removal of Water

11

1 Job

Lump Sum$ xxxxxxxxx$_________________

12

Excavation, Common

21

140,634

Cu. Yd.

$_________$_________________

13

Earthfill, Onsite Borrow(Material Types C, D, and E)

23

131,244

Cu. Yd.

$_________$_________________

14

Earthfill, Imported Borrow(Material Types A and B)

23

3,991

Cu. Yd.

$_________$_________________

15

Drainfill, Fine Filter

24

2,624

Cu. Yd.

$_________$_________________(Bid Schedule continued on next page)IFB No. PCCD-22-PCW21Rehab-01

Page GP-11 of 21

EXHIBIT B (continued)

BID SCHEDULE (Sheet 2 of 3)
PLUM CREEK WATERSHED SITE 21 REHABILITATION
Caldwell County, Texas
Item
No.

Work or Material

Spec.
No. Quantity

Unit

Unit
Price

ExtendedAmount16

Drainfill, Coarse Filter

24

1,427

Cu. Yd.

$_________$_________________

17

Flexbase

24

209

Cu. Yd.

$_________$_________________

18

Topsoiling26

197,801

Sq. Yd.

$_________$_________________

19

Diversions

27

100

Lin. Ft.

$_________$_________________

20

Lime Treated Earthfill(Material Types F and G)

28

12,144

Cu. Yd.

$_________$_________________

21

Furnishing and Handling Lime 28(Material Types F and G)

656

Ton

$_________$_________________

22

Concrete, Structural

31

430.0

Cu. Yd.

$_________$_________________

23

Concrete, Pipe Cradle

31

8.04

Cu. Yd.

$_________$_________________

24

Reinforcing Steel

34

62,200Lb.

$_________$_________________

25

Roller Compacted Concrete
(RCC)

36

7,786

Cu. Yd.

$_________$_________________

26

Cementitious Material

36

1,875.0Ton$_________$_________________

27

Concrete Pressure Pipe,
C301, 42” ID

41

235

Lin. Ft.

$_________$_________________

28

Plastic Pipe, PVC, 6” I.D.

45

3,460

Lin. Ft.

$_________$_________________

29

Rock Riprap

61

7,158

Ton

$_________$_________________

30

Riprap, Bedding

24, 61270

Ton$_________$_________________(Bid Schedule continued on next page)IFB No. PCCD-22-PCW21Rehab-01

Page GP-12 of 21

EXHIBIT B (continued)

BID SCHEDULE (Sheet 3 of 3)
PLUM CREEK WATERSHED SITE 21 REHABILITATION
Caldwell County, Texas
Item
No.

Work or Material

Spec.
No. Quantity
1

Unit
Price

ExtendedAmountEach$_________$_________________

Unit

31

Water Control Slide Gate,
12” x 12”

71

32

Metal Fabrications

81

1 Job

Lump Sum$ xxxxxxxxx$_________________

33

Fence, Chain Link

91

528.0

Lin. Ft.

$_________$_________________

34

Fence, Barbed Wire

92

7,172

Lin. Ft.

$_________$_________________

35

Contractor Quality Control

94

1 Job

Lump Sum$ xxxxxxxxx$_________________

36

Geotextile

95

9,954

Sq. Yd.

$_________$_________________

37

Conduit Abandonment

99

1 Job

Lump Sum$ xxxxxxxxx$_________________

38

Geotechnical Instrumentation 401

1 Job

Lump Sum$ xxxxxxxxx$_________________

Total Bid (Site 21 Rehabilitation)………………………………

$_____________________

NOTE: Also enter amount of Total Bid in figures and words on Exhibit B, page GP-9 of 21.

---- END OF BID SCHEDULE ----IFB No. PCCD-22-PCW21Rehab-01

Page GP-13 of 21

EXHIBIT CREFERENCES
Bidder in accordance with PART I, Subpart B, Instructions to Bidders, Section 3(c) References, shall list
below up to five (5) recent projects upon which he/she has performed work similar to that specified herein.
All lines for each reference shall be filled in completely with up-to-date information. Any omissions to thisform, discrepancies in reference, or unverifiable information may be grounds for disqualification of the bidder.

1.

Project Name:____________________________________________________________
Owner:______________________ Total Contract Cost: $_________________________
Location:_____________________ Completion Date:____________________________
Description of Work: _____________________________________________________________________________________________________________________________
Contact:______________________ Phone Number:(____)________________________

2.

Project Name:____________________________________________________________
Owner:______________________ Total Contract Cost: $_________________________
Location:_____________________ Completion Date:____________________________
Description of Work: _____________________________________________________________________________________________________________________________
Contact:______________________ Phone Number:(____)________________________

3.

Project Name:____________________________________________________________
Owner:______________________ Total Contract Cost: $_________________________
Location:_____________________ Completion Date:____________________________
Description of Work: _____________________________________________________________________________________________________________________________
Contact:______________________ Phone Number:(____)________________________IFB No. PCCD-22-PCW21Rehab-01

Page GP-14 of 21

EXHIBIT C (continued)
4.

Project Name:____________________________________________________________
Owner:______________________ Total Contract Cost: $_________________________
Location:_____________________ Completion Date:____________________________
Description of Work: _____________________________________________________________________________________________________________________________
Contact:______________________ Phone Number:(____)________________________

5.

Project Name:____________________________________________________________
Owner:______________________ Total Contract Cost: $_________________________
Location:_____________________ Completion Date:____________________________
Description of Work: _____________________________________________________________________________________________________________________________
Contact:______________________ Phone Number:(____)________________________IFB No. PCCD-22-PCW21Rehab-01

Page GP-15 of 21

EXHIBIT D

BID BOND FormA BLANK BID BOND FORM (2pages) IS INSERTED AFTER THISPAGE FOR USE OF BIDDERS IN
PREPARATION OF BID.

BID

Date Bond Executed (Must not be later
than bid opening date)

BOND(See Instructions on Reverse)
Principal (Legal name and business address)

Type of Organization (“X” one)
 Individual Joint Venture Partnership Limited Liability Company (LLC) Corporation
State of Incorporation

Surety(ies) (Name and business address)

Penal Sum of Bond
Percent
Of BidPrice

Bid Date

Amount Not to Exceed
Million(s)Thousand(s)Hundred(s)Bid Identification
Invitation No.
PCCD-22-PCW21Rehab-01

Cents

For: Construction

KNOW ALL MEN BY THESE PRESENTS, That we, the Principal and Surety(ies) hereto, are firmly bound to Plum Creek
Conservation District. Lockhart, Texas, hereinafter called the Contracting Local Organization, in the above penal sum
for the payment of which we bind ourselves, our heirs, executors, administrators, and successors, jointly and severally:
Provided, That where the Sureties are corporations acting as co-sureties, we, the Sureties, bind ourselves in such sum“jointly and severally” as well as “severally” only for the purpose of allowing a joint action or actions against any or all ofus, and for all other purposes each Surety binds itself, jointly and severally with the Principal, for the payment of such
sum only as is set forth opposite the name of such Surety, but if no limit of liability is indicated, the limit of liability shallbe the full amount of the penal sum.
THE CONDITION OF THIS OBLIGATION IS SUCH, that whereas the Principal has submitted the bid identified above.
NOW, THEREFORE, if the Principal, upon acceptance by the Contracting Local Organization of his/her bid identified
above, within the period specified therein for acceptance (45 days), shall execute such further contractual documents, ifany, and give such bond(s) as may be required by the terms of the bid as accepted within the time specified (5 workdays
after receipt of the forms by him/her), or in the event of failure so to execute such further contractual documents and givesuch bonds, if the Principal shall pay the Contracting Local Organization for any cost of procuring the work which exceeds
the amount of his/her bid, then the above obligation shall be void and of no effect.
Each Surety executing this instrument hereby agrees that its obligation shall not be impaired by any extension(s) of thetime for acceptance of the bid that the Principal may grant to the Contracting Local Organization, notice of which
extension(s) to the Surety(ies) being hereby waived; provided that such waiver of notice shall apply only with respect toextensions aggregating not more than sixty (60) calendar days in addition to the period originally allowed for acceptanceof the bid.
IN WITNESS WHEREOF, the Principal and Surety(ies) have executed this bid bond and have affixed their seals on thedate set forth above.

Principal
1.

2.

Signature(s)(Seal)
Name(s) & Title(s)[typed]1.

(Seal)
2.

CORPORATE SURETY(IES)

SURETY E

SURETY D

SURETY C

SURETY B

SURETY A

Name &
Address

State of Inc.
1.

Liability Limit

2.

Signature(s)(Seal)
Name(s) &Title(s)[typed]Name &
Address

1.

(Seal)
2.

State of Inc.
1.

Liability Limit

2.

Signature(s)(Seal)
Name(s) &Title(s)[typed]Name &
Address

1.

(Seal)
2.

State of Inc.
1.

Liability Limit

2.

Signature(s)(Seal)
Name(s) &Title(s)[typed]Name &
Address

1.

(Seal)
2.

State of Inc.
1.

Liability Limit

2.

Signature(s)(Seal)
Name(s) &Title(s)[typed]Name &
Address

1.

(Seal)
2.

State of Inc.
1.

Liability Limit

2.

Signature(s)(Seal)
Name(s) &Title(s)[typed]1.

(Seal)
2.

INSTRUCTIONS(1) The full legal name and business address of the Principal shall be inserted in the space designated “Principal”
on the face of this form. The bond shall be signed by an authorized person. Where such person is signing in a
representative capacity (e.g., an attorney-in-fact), but is not a member of the firm, partnership, or joint venture, or an
officer of the corporation involved, evidence of his/her authority must be furnished.
(2) The penal sum of the bond may be expressed as a percentage of the bid price if desired. In such cases, amaximum dollar limitation may be stipulated (e.g., 5% of the bid price but the amount not to exceed ______ dollars).
(3) The name of each person signing this bid bond should be typed in the space provided.
(4) The person signing the bond for the surety must submit evidence of his/her authority to act for the surety.
(5) The corporate surety must be approved by the state in which the services or supplies are to be delivered orin which construction is to be performed and must be among those appearing on the U.S. Treasury Department’s
list of approved sureties.

IFB No. PCCD-22-PCW21Rehab-01

Page GP-16 of 21

EXHIBIT E

BIDDER CERTIFICATIONS
By submission of this bid, bidder certifies to all Sections in this Exhibit E.
Bidder should circle appropriate answers in Sections A, B, C, and I and fill in blank in Section E.
NOTE: The penalty for making false statements in offers is prescribed in 18 U.S.C. 1001.
SECTION A: Texas Franchise Tax Certification
Bidder [ IS / IS NOT ] currently delinquent in the payment of any franchise tax owed to the State of Texas,
or is exempt from, or not subject to, such tax.

SECTION B: Texas Resident/Nonresident Bidder Certification
Bidder [ IS / IS NOT ] a Texas resident bidder as defined below.
DEFINITIONS: Per State of Texas House Bill 620.
“Nonresident bidder” means a bidder whose principal place of business is not in this state, but
excludes a contractor whose ultimate parent company or majority owner has its principal place ofbusiness in this state.
“Texas resident bidder” means a bidder whose principal place of business is in this state, andincludes a contractor whose ultimate parent company or majority owner has its principal place ofbusiness in this state.

SECTION C: Authority to Transact Business in Texas Certificate
Complete ONLY if you are a Texas nonresident bidder.
(1) Texas nonresident bidder [ IS / IS NOT ] a corporation, limited partnership, or limited liability company.
If answer is “IS NOT”, do not complete C(2) and C(3) below.
(2) Bidder [ HAS / HAS NOT ] obtained a Certificate of Authority through the Texas Secretary of State totransact business in Texas. Attach a copy of Certificate to bid if available.
(3) If response to C(2) is “HAS NOT”, bidder agrees to present a current Certificate of Authority to theContracting Local Organization by date post-award information is due: [ YES / NO ]SECTION D: Officials Not to Benefit: Bidder certifies that its firm is not an official of the USDA Natural
Resources Conservation Service, Texas State Soil and Water Conservation Board, Plum Creek
Conservation District, Hays County Soil and Water Conservation District (SWCD), or Caldwell-Travis
SWCD, (all in the State of Texas), or a firm in which any official or any member of such official’s immediatefamily of these entities has direct or indirect interest in the pecuniary profits or contracts of its firm.

SECTION E: Bonding: Per Texas Administrative Code Rule 293.63(5), bidder must submit, along withthe bid, the name of the person, firm, or corporation that will execute payment and performance bonds as
required in PART III, Article 13: List information below:______________________________________________________________________________________________________________________________IFB No. PCCD-22-PCW21Rehab-01

Page GP-17 of 21

SECTION F: Certification of Nonsegregated Facilities[Applicable to federally assisted construction contracts and related subcontracts not exempt from the Equal
Opportunity clause (Article 14 of PART III - Supplemental Conditions)]
The federally assisted construction Contractor certifies they do not maintain or provide for their employees
any segregated facilities at any of their establishments, and that they do not permit their employees toperform services at any location, under their control, where segregated facilities are maintained. The
federally assisted construction Contractor certifies further that they will not maintain or provide for theiremployees any segregated facilities at any of their establishments, and that, they will not permit theiremployees to perform services at any location, under their control, where segregated facilities aremaintained. The federally assisted construction Contractor agrees that a breach of this section is aviolation of the Equal Opportunity clause in this contract. As used in this caption, the term “segregatedfacilities” means any waiting rooms, work areas, restrooms, washrooms, restaurants and other eatingareas, time clocks, locker rooms and other storage or dressing areas, parking lots, drinking fountains,
recreation or entertainment areas, transportation, and housing facilities provided for employees which aresegregated by explicit directive or are in fact segregated on the basis of race, color, religion, sex, sexual
orientation, gender identity, or national origin or because of habit, local custom, or otherwise. The federally
assisted construction Contractor agrees that (except where they have obtained identical certifications fromproposed subcontractors for specific time periods) they will obtain identical certifications from proposed
subcontractors prior to the award of subcontracts which are not exempt from the provisions of the Equal
Opportunity clause, and that they will retain such certifications in their files [certification form in PART III,Suppl. Conditions, Article 15].

SECTION G-1: Certification Regarding Debarment, Suspension, Ineligibility and Voluntary
Exclusion—Lower Tier Covered Transactions[Applicable to offers of $25,000 or more](a) Instructions for Certification(1) By signing and submitting this proposal, the prospective lower tier participant is providing thecertification set out below.
(2) The certification in this clause is a material representation of fact upon which reliance wasplaced when this transaction was entered into. If it is later determined that the prospective lower tierparticipant knowingly rendered an erroneous certification, in addition to other remedies available to theFederal Government, the department or agency with which this transaction originated may pursue available
remedies, including suspension and/or debarment.
(3) The prospective lower tier participant shall provide immediate written notice to the person towhich this proposal is submitted if at any time the prospective lower tier participant learns that its
certification was erroneous when submitted or had become erroneous by reason of changed
circumstances.
(4) The terms herein are as defined in 2 CFR Part 180, OMB Guidelines to Agencies on
Governmentwide Debarment and Suspension (Nonprocurement).
(5) The prospective lower tier participant agrees by submitting this proposal that, should the
proposed covered transaction be entered into, it shall not knowingly enter into any lower tier covered
transaction with a person who is proposed for debarment under 48 Code of Federal Regulations (CFR) part9, subpart 9.4, debarred, suspended, declared ineligible, or voluntarily excluded from participation in thiscovered transaction, unless authorized by the department or agency with which this transaction originated.
(6) The prospective lower tier participant further agrees by submitting this proposal that it will include
this clause titled “Certification Regarding Debarment, Suspension, Ineligibility and Voluntary Exclusion—
Lower Tier Covered Transactions,” without modification, in all lower tier covered transactions of $25,000 or
more and in all solicitations for lower tier covered transactions. [Copy of clause is provided in PART III,Supplemental Conditions, Article 17.](7) A participant in a covered transaction may rely upon a certification of a prospective participant ina lower tier covered transaction that it is not proposed for debarment under 48 CFR part 9, subpart 9.4,
debarred, suspended, ineligible, or voluntarily excluded from covered transactions, unless it knows that thecertification is erroneous. A participant may decide the method and frequency by which it determines theeligibility of its principals. Each participant may, but is not required to, check the Office of Federal

IFB No. PCCD-22-PCW21Rehab-01

Page GP-18 of 21

Compliance Programs electronic roster at the System for Award Management (SAM) website:www.sam.gov.
(8) Nothing contained in the foregoing shall be construed to require establishment of a system ofrecords in order to render in good faith the certification required by this clause. The knowledge andinformation of a participant is not required to exceed that which is normally possessed by a prudent personin the ordinary course of business dealings.
(9) Except for transactions authorized under paragraph (5) of these instructions, if a participant in acovered transaction knowingly enters into a lower tier covered transaction with a person who is proposedfor debarment under 48 CFR part 9, subpart 9.4, suspended, debarred, ineligible, or voluntarily excluded
from participation in this transaction, in addition to other remedies available to the Federal Government, thedepartment or agency with which this transaction originated may pursue available remedies, including
suspension and/or debarment.
Certification Regarding Debarment, Suspension, Ineligibility andVoluntary Exclusion – Lower Tier Covered Transactions(1) The prospective lower tier participant certifies, by submission of this proposal, that neither it nor its
principals is presently debarred, suspended, proposed for debarment, declared ineligible, or voluntarily
excluded from participation in this transaction by any Federal department or agency.
(2) Where the prospective lower tier participant is unable to certify to any of the statements in thiscertification, such prospective participant shall attach an explanation to this offer.

SECTION G-2: Texas Certification Regarding Debarment, Suspension, Ineligibility and Voluntary
Exclusion—Lower Tier Covered Transactions
Bidder hereby certifies he/she is not presently on the State of Texas debarred vendor list maintained by the
Texas Comptroller of Public Accounts.

SECTION H: Certification Regarding Lobbying Certification for Contracts, Grants, Loans, andCooperative Agreements[Applicable to offers of $100,000 or more]
By signing and submitting this proposal, the offeror certifies, to the best of his or her knowledge and belief,that:(1) No Federal appropriated funds have been paid or will be paid, by or on behalf of the undersigned,
to any person for influencing or attempting to influence an officer or employee of an agency, a Member ofCongress, an officer or employee of Congress, or an employee of a Member of Congress in connection
with the awarding of any Federal contract, the making of any Federal grant, the making of any Federal
loan, the entering into of any cooperative agreement, and the extension, continuation, renewal,
amendment, or modification of any Federal contract, grant, loan, or cooperative agreement.
(2) If any funds other than Federal appropriated funds have been paid or will be paid to any person
for influencing or attempting to influence an officer or employee of any agency, a Member of Congress, anofficer or employee of Congress, or an employee of a Member of Congress in connection with this Federal
contract, grant, loan, or cooperative agreement, the undersigned shall complete and submit Standard
Form-LLL, “Disclosure Form to Report Lobbying,” in accordance with its instructions.
(3) The undersigned shall require that the language of this certification be included in the award
documents for all subawards at all tiers (including subcontracts, subgrants, and contracts under grants,
loans, and cooperative agreements) and that all subrecipients shall certify and disclose accordingly. [Acopy is provided in PART III, Supplemental Conditions, Article 18.]
This certification is a material representation of fact upon which reliance was placed when this transaction
was made or entered into. Submission of this certification is a prerequisite for making or entering into thistransaction imposed by section 1352, Title 31, U.S. Code. Any person who fails to file the required
certification shall be subject to a civil penalty of not less than $10,000 and not more than $100,000 for eachsuch failure.

IFB No. PCCD-22-PCW21Rehab-01

Page GP-19 of 21

SECTION I: Clean Air and Water Certification [Applicable if bid exceeds $150,000--OR-- if facility to be used has been the subject of a conviction under the Clean Air Act (42 U.S.C. 1857c8(c)(1) or the Federal Water Pollution Control Act (33 U.S.C. 1319(c)) and is listed by EPA --OR-- if any
resultant contract under this bid is not otherwise exempt.]
Bidder certifies as follows:(1) Any facility to be utilized in the performance of work described in this IFB [ IS / IS NOT ] listed on theEnvironmental Protection Agency List of Violating Facilities;(2) To promptly notify the Contracting Local Organization (CLO), before contract award, of the receipt ofany communication from the Director, Office of Federal Activities, U.S. Environmental Protection
Agency, indicating that any facility which he/she proposes to use for the performance of the contract isunder consideration to be listed on the Environmental Protection Agency List of Violating Facilities; and(3) To include substantially this certification, including this subparagraph (3), in every nonexempt
subcontract. [Certification form in PART III, Suppl. Conditions, Article 19]

SECTION J: Excluded Parties / Foreign Terrorist Organizations. Bidder certifies that it is not listed on
the Federal government’s terrorism watch list as described in Executive Order 13224. Bidder also
represents and warrants that it is not engaged in business with Iran, Sudan, or a foreign terrorist
organization, as prohibited by Section 2252.152 of the Texas Government Code.

SECTION K: E-Verify. Contractor certifies and ensures that it utilizes and will continue to utilize the U.S.
Department of Homeland Security E-Verify system to determine the eligibility of all persons andsubcontractors performing duties within Texas during the term of the contract.

SECTION L: Israel Boycott. Bidder represents and warrants that, pursuant to Section 2270.002 of the
Texas Government Code, bidder does not boycott Israel and will not boycott Israel during the term of thecontract.

-- end of EXHIBIT E Bidder Certifications --IFB No. PCCD-22-PCW21Rehab-01

Page GP-20 of 21

PART I – GENERAL PROVISIONSSUBPART D

CONTRACT AGREEMENT (Sample)
THIS AGREEMENT, made the _____ day of __________________, 2022, by and between the Plum
Creek Conservation District, Lockhart, Texas (hereinafter called Owner) and________________________________________________ (hereinafter called Contractor).
WITNESSETH:THAT WHEREAS: in accordance with law, Owner had contract documents prepared and an Invitation for
Bids published, for and in connection with the Rehabilitation of Plum Creek Watershed, Floodwater
Retarding Structure Site 21, Caldwell County, Texas; andWHEREAS, Contractor, in response to the Invitation for Bids, has submitted to Owner, in the manner andat the time specified, a sealed bid in accordance with Instructions to Bidders; andWHEREAS, Owner, in the manner prescribed by law, has publicly opened, examined, and canvassed thebids submitted, and has determined Contractor to be the lowest responsible bidder for the work and duly
awarded to Contractor a contract therefor, for the sum or sums named in Contractor’s bid.
NOW, THEREFORE, in consideration of the compensation to be paid to Contractor and of the mutual
agreements herein contained, the parties have agreed and hereby agree, Owner for itself and its
successors and assigns, and its, his/her, or their executors and administrators, as follows:
ARTICLE I. Contractor shall perform all work, including the assumption of all obligations, duties andresponsibilities necessary to the successful completion of the contract and the furnishing of all materials
and equipment required to be incorporated in and form a permanent part of the work; tools, equipment,
supplies, transportation, facilities, labor, superintendence and services required to perform the work; andbonds, insurance and submittals; all as indicated or specified in the contract documents to be performed or
furnished by Contractor for the work included in and covered by Owner’s official award of this contract toContractor, such award being based on the acceptance by Owner of Contractor’s bid.
ARTICLE II. Owner shall pay to Contractor for performance of the work embraced in this contract, andContractor shall accept as full compensation therefor, the sum (subject to adjustment as provided in thecontract documents) of ______________________________________ Dollars ($ ______________) for all
work covered by and included in the contract award and designated in the foregoing Article I; payment
thereof to be made in current funds in the manner provided in the contract documents.
ARTICLE III. The Contractor shall complete all work within five hundred seventy-three (573) calendar days
from the date Contractor receives written Notice to Proceed.
ARTICLE IV. The contract documents that comprise the Contract between Owner and Contractor,
attached hereto and made a part hereof, consist of the following:
(1)
(2)
(3)

This Contract Agreement.
Contractor’s Bid: Exhibits A - E.
Invitation for Bids (IFB) Amendment Numbers _______.

IFB No. PCCD-22-PCW21Rehab-01

(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)

Page GP-21 of 21

Post-bid information and supplementary information submitted by Contractor prior to execution ofthis Contract Agreement.
Notice of Award.
PART II – General Conditions.
PART III – Supplemental Conditions.
PART IV – Construction and Material Specifications.
PART V – Drawing No. TX-EN-0754 (cover page + sheets 1-83).
PART VI – Prevailing Wage Rates Determination.
Notice to Proceed.
Any modifications (change orders) duly delivered or supplemental agreements duly entered into
after execution of this Contract Agreement.
Notices of Final Completion and Acceptance.

IN WITNESS WHEREOF, the parties hereto have executed this Contract Agreement the day and year first
above written.
OWNER

CONTRACTOR

PLUM CREEK CONSERVATION DISTRICT____________________________________

By _________________________________JAMES A. HOLT, JR.
President, Plum Creek Conservation District

By ________________________________
Title _______________________________(CORPORATE SEAL)

Attest _______________________________

Attest _______________________________

Address for giving notices:
Plum Creek Conservation District
1101 West San Antonio Street
Lockhart, TX 78644

Address for giving notices________________________________________________________________________

This action authorized at an official meetingof the Plum Creek Conservation District on________[add date], Lockhart, Texas

License No. __________________________________________________DANIEL MEYERPCCD Executive Manager____________________________________(If CONTRACTOR is a corporation, attach
evidence of authority to sign.)

Agent for service of process:IFB No. PCCD-22-PCW21Rehab-01

PART II – Contents

PART II
GENERAL CONDITIONS
Table of Contents
Page No.
ARTICLE 1

DEFINITIONS ..................................................................................................GC-1

ARTICLE 2

SPECIFICATIONS AND DRAWINGS..............................................................GC-1

ARTICLE 3

CHANGES .......................................................................................................GC-1

ARTICLE 4

DIFFERING SITE CONDITIONS .....................................................................GC-2

ARTICLE 5

TERMINATION FOR DEFAULT, DAMAGESFOR DELAY, TIME EXTENSIONS ..................................................................GC-2

ARTICLE 6

CLAIMS ............................................................................................................GC-3

ARTICLE 7

PAYMENTS TO CONTRACTOR / INVOICINGREQUIREMENTS ............................................................................................GC-3

ARTICLE 8

MATERIAL AND WORKMANSHIP ..................................................................GC-5

ARTICLE 9

INSPECTION AND ACCEPTANCE .................................................................GC-5

ARTICLE 10

SUPERINTENDENCE BY CONTRACTOR .....................................................GC-6

ARTICLE 11

PERMITS AND RESPONSIBILITIES ..............................................................GC-6

ARTICLE 12

CONDITIONS AFFECTING THE WORK ........................................................GC-6

ARTICLE 13

OTHER CONTRACTS .....................................................................................GC-6

ARTICLE 14

PATENT INDEMNITY ......................................................................................GC-6

ARTICLE 15

ADDITIONAL BOND SECURITY .....................................................................GC-6

ARTICLE 16

REAL PROPERTY RIGHTS ............................................................................GC-7

ARTICLE 17

RECORDS OF TEST PITS AND BORINGS ...................................................GC-7

ARTICLE 18

MATERIALS TO BE FURNISHED BY THE CONTRACTOR ..........................GC-7

ARTICLE 19

WATER ............................................................................................................GC-7

ARTICLE 20

WORKWEEK – CONSTRUCTION SCHEDULE .............................................GC-7

ARTICLE 21

SUBCONTRACTORS ......................................................................................GC-8

ARTICLE 22

SURVEYS ........................................................................................................GC-8

GC-i

IFB No. PCCD-22-PCW21Rehab-01

PART II – Contents

Page No.
ARTICLE 23

SUSPENSION OF WORK ...............................................................................GC-8

ARTICLE 24

CLEANUP WORK ............................................................................................GC-9

ARTICLE 25

ASSIGNMENT .................................................................................................GC-9

ARTICLE 26

WEATHER .......................................................................................................GC-9

ARTICLE 27

NONCOMPLIANCE WITH CONTRACT REQUIREMENTS ............................GC-9

ARTICLE 28

QUANTITY VARIATIONS ................................................................................GC-9

ARTICLE 29

FEDERAL, STATE, AND LOCAL TAXES .....................................................GC-10

ARTICLE 30

SHOP DRAWINGS ........................................................................................GC-10

ARTICLE 31

TERMINATION FOR CONVENIENCE OF
THE CONTRACTING LOCAL ORGANIZATION ...........................................GC-10

ARTICLE 32

PROTECTION OF EXISTING VEGETATION, STRUCTURES,
EQUIPMENT, UTILITIES, AND IMPROVEMENTS .......................................GC-11

ARTICLE 33

OPERATIONS AND STORAGE AREAS .......................................................GC-11

ARTICLE 34

USE AND POSSESSION PRIOR TO COMPLETION ...................................GC-11

ARTICLE 35

LAYOUT OF WORK ......................................................................................GC-11

ARTICLE 36

PRECONSTRUCTION CONFERENCE ........................................................GC-12

ARTICLE 37

CONTRACTOR RECORDS ...........................................................................GC-12

ARTICLE 38

ARCHEOLOGICAL OR HISTORIC SITES ....................................................GC-12

ARTICLE 39

CONTROL OF EROSION, SEDIMENTATION,
AND POLLUTION ..........................................................................................GC-12

ARTICLE 40[RESERVED] .................................................................................................GC-12

ARTICLE 41

ACCIDENT PREVENTION & SAFETY (OSHA Supplement) ........................GC-12
A. General Contractor Requirements .........................................................GC-13
B. First Aid and Medical Facilities ...............................................................GC-14
C. Physical Qualifications of Employees ....................................................GC-15
D. Personal Protective Equipment ..............................................................GC-15
E. Machinery and Mechanized Equipment .................................................GC-15
F. Ladders and Scaffolding .........................................................................GC-17

GC-ii

IFB No. PCCD-22-PCW21Rehab-01

GC-1 of 18

PART II - GENERAL CONDITIONSARTICLE 1 – DEFINITIONS
Terms used or referred to herein and elsewhere in the contract documents are defined as follows:(a) Contracting Local Organization (CLO): The organization or agency awarding the contract. (CLO)
is the Plum Creek Conservation District, Lockhart, Texas. Also referred to as District and Owner.
(b) Contracting Officer (CO): The person who is designated and authorized to enter into and administer
this contract on behalf of the Contracting Local Organization or his/her duly appointed successor or alternate.
No other person has authority to act for the Contracting Officer as stated in these General Conditions orelsewhere in the contract documents unless such person has been delegated authority by the Contracting
Officer in writing. Also referred to as Owner’s Representative.
(c) Engineer: The person or his/her representative who is responsible for determining that the Contractor’s
work conforms to the technical requirements as set forth in the drawings and specifications. Also called Project
Engineer, Government Representative (GR), Contracting Officer’s Representative (COR), and Contracting
Officer’s Technical Representative (COTR).
(d) Inspector: The person who performs daily inspection services for the CLO at the construction site andmaintains accurate daily records of the work accomplished and the factors affecting its progress and quality.
Also called NRCS Construction Inspector, NRCS Inspector, and Government inspector.
(e) USDA-NRCS. United States Department of Agriculture, Natural Resources Conservation Service – theFederal agency providing engineering and inspection services for this contract. Also referred to as
Government.
(f) Quality Assurance (QA). NRCS Construction Inspector (onsite).
(g) Quality Control (QC). NRCS Construction Inspector (onsite).
ARTICLE 2 – SPECIFICATIONS AND DRAWINGSThe Contractor shall keep on the worksite a copy of the drawings and specifications and shall at all times give
the Contracting Officer access thereto. Anything mentioned in the specifications and not shown on thedrawings, or shown on the drawings and not mentioned in the specifications, shall be of like effect as if shownor mentioned in both. In case of difference between drawings and specifications, the specifications shallgovern. In case of discrepancy either in the figures, in the drawings, or in the specifications, the matter shallbe promptly submitted to the Contracting Officer, who shall promptly make a determination in writing. Any
adjustment by the Contractor without such a determination shall be at his/her own risk and expense. The
Contracting Officer shall furnish from time to time such detail drawings and other information as considerednecessary, unless otherwise provided.
ARTICLE 3 – CHANGES(a) The Contracting Officer may, at any time, without notice to the sureties, by written order designated orindicated to be a change order, make any change in the work within the general scope of the contract, including
but not limited to changes:(1) In the specifications (including drawings and designs);(2) In the method or manner of performance of the work;(3) In the Contracting Local Organization-furnished facilities, equipment, materials, services, or site; or(4) Directing acceleration in the performance of the work.
(b) Any other written order or an oral order (which terms as used in this paragraph (b) shall include direction,
instruction, interpretation, or determination) from the Contracting Officer, which causes any such change, shallbe treated as a change order under this article, provided that the Contractor gives the Contracting Officer written
notice stating the date, circumstances, and source of the order and that the Contractor regards the order as achange order.
(c) Except as herein provided, no order, statement, or conduct of the Contracting Officer shall be treatedas a change under this article or entitle the Contractor to an equitable adjustment hereunder.
(d) If any change under this article causes an increase or decrease in the Contractor’s cost of, or the timerequired for, the performance of any part of the work under this contract, whether or not changed by any order,
an equitable adjustment shall be made and the contract modified in writing accordingly: Provided, however,That except for claims based on defective specifications, no claim for any change under (b) above shall be

IFB No. PCCD-22-PCW21Rehab-01

GC-2 of 18

allowed for any costs incurred more than 20 days before the Contractor gives written notice as therein required:And provided further, That in the case of defective specifications for which the Contracting Local Organizationis responsible, the equitable adjustment shall include any increased cost reasonably incurred by the Contractor
in attempting to comply with such defective specifications.
(e) If the Contractor intends to assert a claim for an equitable adjustment under this article, Contractor
must, within 30 days after receipt of a written change order under (a) above or the furnishing of a written noticeunder (b) above, submit to the Contracting Officer a written statement setting forth the general nature andmonetary extent of such claim, unless this period is extended by the Contracting Officer. The statement ofclaim hereunder may be included in the notice under (b) above.
(f) No claim by the Contractor for an equitable adjustment hereunder shall be allowed if asserted after final
payment under this contract.
ARTICLE 4 – DIFFERING SITE CONDITIONS(a) The Contractor shall promptly, and before such conditions are disturbed, notify the Contracting Officer
in writing of: (1) subsurface or latent physical conditions at the site differing materially from those indicated inthis contract, or (2) unknown physical conditions at the site, of an unusual nature, differing materially from thoseordinarily encountered and generally recognized as inhering in work of the character provided for in thiscontract. The Contracting Officer shall promptly investigate the conditions, and if he/she finds that suchconditions do materially so differ and cause an increase or decrease in the Contractor’s cost of, or the timerequired for, performance of any part of the work under this contract, whether or not changed as a result ofsuch conditions, an equitable adjustment shall be made and the contract modified in writing accordingly.
(b) No claim of the Contractor under this article shall be allowed unless the Contractor has given the noticerequired in (a) above; provided, however, the time prescribed therefor may be extended by the Contracting
Officer.
(c) No claim by the Contractor for an equitable adjustment hereunder shall be allowed if asserted after final
payment under this contract.
ARTICLE 5 – TERMINATION FOR DEFAULT, DAMAGES FOR DELAY, TIME EXTENSIONS(a) If the Contractor refuses or fails to prosecute the work, or any separable part thereof, with such diligenceas will insure its completion within the time specified in this contract, or any extension thereof, or fails tocomplete said work within such time, the Contracting Local Organization may, by written notice to theContractor, terminate Contractor’s right to proceed with the work or such part of the work as to which there has
been delay. In such event the Contracting Local Organization may take over the work and prosecute the same
to completion, by contract or otherwise, and may take possession of and utilize in completing the work suchmaterials, appliances, and plant as may be on the site of the work and necessary therefor. Whether or not theContractor’s right to proceed with the work is terminated, Contractor and his/her sureties shall be liable for any
damage to the Contracting Local Organization resulting from his/her refusal or failure to complete the workwithin the specified time.
(b) If the Contracting Local Organization so terminates the Contractor’s right to proceed, the resulting
damage will consist of such actual damages until such reasonable time as may be required for final completionof the work together with any increased costs occasioned the Contracting Local Organization in completing thework.
(c) If the Contracting Local Organization does not so terminate the Contractor’s right to proceed, theresulting damage will consist of such actual damages until the work is completed or accepted.
(d) The Contractor’s right to proceed shall not be so terminated nor the Contractor charged with resulting
damage if:(1) The delay in the completion of the work arises from unforeseeable causes beyond the control andwithout the fault or negligence of the Contractor, including but not restricted to, acts of God, acts of the public
enemy, acts of the Contracting Local Organization in its contractual capacity, acts of another contractor in theperformance of a contract with the Contracting Local Organization, fires, floods, epidemics, quarantine
restrictions, strikes, freight embargoes, unusually severe weather, or delays of subcontractors or suppliersarising from unforeseeable causes beyond the control and without the fault or negligence of both the Contractor
and such subcontractors or suppliers; andIFB No. PCCD-22-PCW21Rehab-01

GC-3 of 18(2) The Contractor, within 10 days from the beginning of any such delay (unless the Contracting Officer
grants a further period of time before the date of final payment under the contract), notifies the Contracting
Officer in writing of the causes of delay.
(3) The Contracting Officer shall ascertain the facts and the extent of the delay and extend the time forcompleting the work when, in his/her judgment, such an extension is justified.
(4) Delays Due to COVID-19. PCCD will utilize OSHA, CDC, and Texas Department of State HealthServices guidelines in determining if/when to issue a Suspend Work Order for situations caused by COVID19. This would include, but is not limited to, any Emergency Management Declaration that affects
construction work or if a person working at or visiting the worksite has tested positive. The length of thework suspension also will be based upon the recommendations in these guidelines.
(e) The rights and remedies of the Contracting Local Organization provided in this article are in addition to
any other rights and remedies provided by law or under this contract.
(f) As used in paragraph (d)(1) of this article, the term “subcontractors and suppliers” means
subcontractors and suppliers at any tier.
ARTICLE 6 – CLAIMS
Any claim by the Contractor arising by virtue of this contract which is not disposed of by agreement shall be
submitted in writing, together with any written and oral evidence in support thereof, to the Contracting Officer
for decision. Before making a decision the Contracting Officer shall notify the Contractor that any additional
written and/or oral evidence in support of the claim may be presented to the Contracting Officer within 30 days
from receipt by the Contractor of such notification, or within such further period of time as may be granted by
the Contracting Officer. The Contracting Officer shall make a decision in writing and mail or otherwise furnish
a signed copy thereof to the Contractor. Pending the decision of the Contracting Officer the Contractor shallproceed diligently with the performance of this contract. [See Also: PART III, Supplemental Conditions, Article
11 – Disputes/Alternative Dispute Resolution]
ARTICLE 7 – PAYMENTS TO CONTRACTOR / INVOICING REQUIREMENTS(a) The Contracting Local Organization will pay the contract price as hereinafter provided and will secure
review and approval of Contractor invoices by various agencies as required by funding requirements.
(b) The Contracting Local Organization will make progress payments monthly as the work proceeds, or atmore frequent intervals as determined by the Contracting Officer, on estimates approved by the Contracting
Officer. If requested by the Contracting Officer, the Contractor shall furnish a breakdown of the total contract
price showing the amount included therein for each principal category of the work, in such detail as requested,
to provide a basis for determining progress payments. In the preparation of estimates the Contracting Officer,
at his/her discretion, may authorize material delivered on the site and preparatory work done to be taken into
consideration and if the Contractor furnishes satisfactory evidence that he/she has acquired title to the material
and that it will be utilized on the work covered by the contract. Payment for material delivered to the Contractor
at locations other than the site will not be authorized.
(c) In making such progress payments, 10 percent of the estimated amount shall be retained until final
completion and acceptance of the contract work. However, if the Contracting Officer at any time after 50
percent of the work has been completed finds satisfactory progress is being made, he/she may authorize anyof the remaining progress payments to be made in full without retention of a percentage. Also, whenever thework is substantially complete, the Contracting Officer, if he/she finds the amount retained to be in excess of
the amount adequate for the protection of the Contracting Local Organization, at his/her discretion may releaseto the Contractor all or a portion of any excess amount. The Contracting Local Organization shall not be
obligated to pay any interest on the 10 percent retainage held on the first 50 percent of work completed. If theContracting Local Organization holds any retainage on the remaining 50 percent of the work completed, theContracting Local Organization shall pay interest on such retainage from the date the retainage is withheld tothe date of payment to the Contractor. The interest rate to be paid on such retainage shall be the rate of interest
paid by the Contracting Local Organization’s depository bank on interest bearing accounts of similar amounts
during the period of time interest accrues as provided herein. Furthermore, on completion and acceptance ofeach separate project, public work, or other division of the contract, on which the price is stated separately inthe contract, payment may be made without retention of a percentage.

IFB No. PCCD-22-PCW21Rehab-01

GC-4 of 18(d) All material and work covered by progress payments made shall thereupon become the sole propertyof the Contracting Local Organization, but this provision shall not be construed as relieving the Contractor fromthe sole responsibility for all material and work upon which payments have been made or the restoration of any
damaged work, or as waiving the right of the Contracting Local Organization to require the fulfillment of all of
the terms of the contract.
(e) “Properly Executed Invoice” Requirements(1) The original and one copy of each invoice are to be delivered to the Contracting Officer at thedesignated payment office.
(2) One copy of each invoice and complete documentation of computations and supporting data as
required by PART IV, Construction Specification 7 are to be submitted to the Engineer.
(3) The following must be attached to the original invoice submitted to the Contracting Officer and tothe copy submitted to the Engineer:(i)
A complete remittance address along with vendor’s tax identification number.
(ii)
Billing period.
(iii)
If requesting payment for materials delivered but not installed, Contractor will provide
evidence of title to the materials and that it will be utilized on the work covered by the contract.
(iv)
Itemization of payment requests by Contract Item Number (CIN) as shown in PART I,
Subpart C, Exhibit B—Bid Schedule, of the contract. Invoice will include the quantity performed that is being
invoiced, the unit price (if applicable) and the CIN total price, and a sum total of amount of payment requested.
Invoice will also include the cumulative quantities and amount by CIN.
(f) Designated Payment Office Contact Point. The contact point described below coordinates the issuanceof payments under this contract:
Name:
Karen Bridges
Title:
Office Secretary
Address:Plum Creek Conservation District, 1101 W. San Antonio St., Lockhart, TX 76844
Telephone: (512) 398-2383
FAX: (512) 398-7776(g) Final Payment Request(1) The Contracting Local Organization shall pay the amount due the Contractor under this contract
after-(i)Completion and acceptance of all work;(ii)
Presentation of a properly executed invoice; and(iii)
Presentation of release as indicated in (g)(3) below.
(2) The FINAL invoice billing shall include the following information:(i)
All documentation called for in the contract documents, and(ii)Consent of the surety, if required, to final payment.
(iii)
Complete and legally effective releases or waivers (satisfactory to Contracting Local
Organization) of all liens arising out of or filed in connection with the work. In lieu thereof and as approved byContracting Local Organization, Contractor may furnish receipts or releases in full; an affidavit of Contractor
that the releases and receipts include all labor, services, material and equipment for which a lien could be filed,
and that all payrolls, material and equipment bills, and other indebtedness connected with the work for which
Contracting Local Organization or his/her property might in any way be responsible, have been paid orotherwise satisfied. If any subcontractor, manufacturer, fabricator, supplier, or distributor fails to furnish arelease of receipt in full, Contractor may furnish a bond or other collateral satisfactory to Contracting Local
Organization to indemnify Contracting Local Organization against any lien.
(3) The FINAL invoice shall also contain the following RELEASE OF CLAIMS statement:“I, [Name of Contractor], do hereby release the Plum Creek Conservation District , Lockhart,
Texas, from any and all claims of any character whatsoever arising under and by virtue of contract
number [Identify Contract] dated [Date] as amended, except as herein stated [LIST any
Exceptions].
_______________________________________________________(Date of Release)(Signature of Contractor)(4) Releases may also be required of the assignee if the Contractor's claim to amounts payable under
this contract has been assigned under Article 25 of these General Conditions – Assignment, of this contract.

IFB No. PCCD-22-PCW21Rehab-01

GC-5 of 18(h) This contract is subject to regulations incorporated in Texas Government Code, Subtitle F, Chapter
2251 – Payment for Goods and Services, regarding payment due dates, late payment interest, and claims anddisputes. These regulations include, but are not limited to, payments made by Contracting Local Organization,
Contractor, and subcontractors for any work, goods, services, etc. provided under this contract.
ARTICLE 8 – MATERIAL AND WORKMANSHIP(a) Unless otherwise specifically provided in this contract, all equipment, material, and articles incorporated
in the work covered by this contract are to be new and of the most suitable grade for the purpose intended.
Unless otherwise specifically provided in this contract, reference to any equipment, material, article, or patented
process, by trade name, make, or catalog number, shall be regarded as establishing a standard of quality andshall not be construed as limiting competition, and the Contractor may, at his/her option, use any equipment,material, article, or process which in the judgment of the Contracting Officer, is equal to that named. The
Contractor shall furnish to the Contracting Officer for his/her approval the name of the manufacturer, the model
number, and other identifying data and information respecting the performance, capacity, nature, and rating of
the machinery and mechanical and other equipment which the Contractor contemplates incorporating in thework. When required by this contract or when called for by the Contracting Officer, the Contractor shall furnish
the Contracting Officer for approval full information concerning the material or articles which Contractor
contemplates incorporating in the work. When so directed, samples shall be submitted for approval at theContractor’s expense, with all shipping charges prepaid. Machinery, equipment, material, and articles installed
or used without required approval shall be at the risk of subsequent rejection.
(b) All work under this contract shall be performed in a skillful and workmanlike manner. The Contracting
Officer may, in writing, require the Contractor to remove from the work any employee the Contracting Officer
deems incompetent, careless, or otherwise objectionable.
ARTICLE 9 – INSPECTION AND ACCEPTANCE(a) All work (which term includes but is not restricted to materials, workmanship, and manufacture andfabrication of components) shall be subject to inspection and test by the Contracting Local Organization at allreasonable times and at all places prior to acceptance. Any such inspection and test is for the sole benefit of
the Contracting Local Organization and shall not relieve the Contractor of the responsibility of providing quality
control measures to assure that the work strictly complies with the contract requirements. No inspection or testby the Contracting Local Organization shall be construed as constituting or implying acceptance. Inspection
or test shall not relieve the Contractor of responsibility for damage to or loss of the material prior to acceptance,
nor in any way affect the continuing rights of the Contracting Local Organization after acceptance of thecompleted work under the terms of paragraph (f) of this article, except as herein above provided.
(b) The Contractor shall, without charge, replace any material or correct any workmanship found by theContracting Local Organization not to conform to the contract requirements, unless in the public interest theContracting Local Organization consents to accept such material or workmanship with an appropriate
adjustment in contract price. The Contractor shall promptly segregate and remove rejected material from thepremises.
(c) If the Contractor does not promptly replace rejected material or correct rejected workmanship, theContracting Local Organization (1) may, by contract or otherwise, replace such material or correct suchworkmanship and charge the cost thereof to the Contractor, or (2) may terminate the Contractor’s right toproceed in accordance with Article 5, Termination for Default - Damages for Delay – Time Extensions, of these
General Conditions.
(d) The Contractor shall furnish promptly, without additional charge, all facilities, labor, and material
reasonably needed for performing such safe and convenient inspection and test as may be required by theContracting Officer. All inspection and test by the Contracting Local Organization shall be performed in suchmanner as not unnecessarily to delay the work. Special, full size, and performance tests shall be performed
as described in this contract. The Contracting Local Organization reserves the right to charge to the Contractor
any additional cost of inspection or test when material or workmanship is not ready at the time specified by theContractor for inspection or test or when reinspection or retest is necessitated by prior rejection.
(e) Should it be considered necessary or advisable by the Contracting Local Organization at any time
before acceptance of the entire work to make an examination of work already completed, by removing or tearingout same, the Contractor shall, on request, promptly furnish all necessary facilities, labor, and material. If suchwork is found to be defective or nonconforming in any material respect, due to the fault of the Contractor orIFB No. PCCD-22-PCW21Rehab-01

GC-6 of 18

his/her subcontractors, Contractor shall defray all the expenses of such examination and of satisfactoryreconstruction. If, however, such work is found to meet the requirements of the contract, an equitableadjustment shall be made in the contract price to compensate the Contractor for the additional services involvedin such examination and reconstruction and, if completion of the work has been delayed thereby, Contractor
shall, in addition, be granted a suitable extension of time.
(f) Unless otherwise provided in this contract, acceptance by the Contracting Local Organization shall bemade as promptly as practicable after completion and inspection of all work required by this contract, or that
portion of the work that the Contracting Officer determines can be accepted separately. Acceptance shall befinal and conclusive except as regards latent defects, fraud, or such gross mistakes as may amount to fraud,or as regards the Contracting Local Organization’s rights under any warranty or guarantee.
ARTICLE 10 – SUPERINTENDENCE BY CONTRACTOR
The Contractor, at all times during performance and until the work is completed and accepted, shall give his/her
personal superintendence to the work or have on the work a competent superintendent, satisfactory to theContracting Officer and with authority to act for the Contractor.
ARTICLE 11 – PERMITS AND RESPONSIBILITIESThe Contractor shall, without additional expense to the Contracting Local Organization, be responsible forobtaining any necessary licenses and permits, and for complying with any applicable Federal, State, andmunicipal laws, codes, and regulations, in connection with the prosecution of the work. Contractor shall besimilarly responsible for all damages to persons or property that occur as a result of his/her fault or
negligence. He/she shall take proper safety and health precautions to protect the work, the workers, thepublic, and the property of others. He/she shall also be responsible for all materials delivered and work
performed until completion and acceptance of the entire construction work, except for any completed unitof construction thereof which theretofore may have been accepted.
ARTICLE 12 – CONDITIONS AFFECTING THE WORKThe Contractor shall be responsible for having taken steps reasonably necessary to ascertain the nature andlocation of the work, and the general and local conditions which can affect the work or the cost thereof. Any
failure by the Contractor to do so will not relieve Contractor from responsibility for successfully performing thework without additional expense to the Contracting Local Organization. The Contracting Local Organization
assumes no responsibility for any understanding or representations concerning conditions made by any of its
officers or agents prior to the execution of this contract, unless such understanding or representations by theContracting Local Organization are expressly stated in the contract.
ARTICLE 13 – OTHER CONTRACTSThe Contracting Local Organization may undertake or award other contracts for additional work, and theContractor shall fully cooperate with such other contractors and Contracting Local Organization employees andcarefully fit his/her own work to such additional work as may be directed by the Contracting Officer. The
Contractor shall not commit or permit any act which will interfere with the performance of work by any othercontractor or by Contracting Local Organization employees.
ARTICLE 14 – PATENT INDEMNITY
Except as otherwise provided, the Contractor agrees to indemnify the Contracting Local Organization and its
officers, agents and employees against liability, including costs and expenses, for infringement upon any
Letters Patent of the United States (except Letters Patent issued upon an application which is now or may
hereafter be, for reasons of national security, ordered by the Government to be kept secret or otherwise
withheld from issue) arising out of the performance of this contract or out of the use or disposal by or for theaccount of the Contracting Local Organization of supplies furnished or work performed hereunder.
ARTICLE 15 – ADDITIONAL BOND SECURITY
If any surety upon any bond furnished in connection with this contract becomes unacceptable to the Contracting
Local Organization, or if any such surety fails to furnish reports as to its financial condition from time to time asrequested by the Contracting Local Organization, or if the contract price is increased to such an extent that thepenal sum of any bond becomes inadequate in the opinion of the Contracting Officer, the Contractor shallIFB No. PCCD-22-PCW21Rehab-01

GC-7 of 18

promptly furnish such additional security as may be required from time to time to protect the interests of theContracting Local Organization and of persons supplying labor or materials in the prosecution of the work
contemplated by this contract.
ARTICLE 16 – REAL PROPERTY RIGHTS(a) Adequate real property rights needed in order to perform the work under this contract have beenacquired by or on behalf of the Contracting Local Organization. The right to enter, remove, or otherwise makeuse of adjacent property, roads, utility lines, fences, and other improvements not included within the real
property rights provided shall be the sole responsibility of the Contractor.
(b) Where ingress and egress is not defined on the drawings, the Contracting Officer shall designate theright-of-way to be used.
(c) The Contractor shall obtain owner’s advance written approval if he/she plans to enter, remove, orotherwise make use of adjacent property, roads, utility lines, fences, and other improvements not included
within the real property rights provided by the Contracting Local Organization. A copy of the written approvalmust be submitted to the Contracting Officer. The Contractor is responsible for any and all expenses
associated with these items. Any Contractor-proposed changes to items designated or shown in the plans andspecifications (e.g., site entrance, stockpile area, campsite, etc.) must be approved by the Contracting Officer
at his/her sole discretion.
ARTICLE 17 – RECORDS OF TEST PITS AND BORINGSThe Contracting Local Organization does not represent that the available records show completely the existing
conditions and does not guarantee any interpretation of these records. The Contractor assumes all
responsibility for deductions and conclusions as to the nature of rock and other materials to be excavated, thedifficulties of making and maintaining the required excavations and of doing other work affected by the geologyof the site of the work, and for the final preparation of the foundations for the spillway, dikes, and otherstructures.
ARTICLE 18 – MATERIALS TO BE FURNISHED BY THE CONTRACTOR(a) Unless otherwise specified in this contract, the Contractor shall furnish all materials required for thecompletion of the contract.
(b) Unless otherwise waived in writing by the Contracting Officer, the Contractor shall furnish theContracting Local Organization with certifications dated and signed by the manufacturer and/or supplier to theeffect that the items listed therein meet the requirements of this contract. Such certifications shall be furnishedprior to the use of the material in any part of the construction and shall identify the project on which the material
is to be used.
ARTICLE 19 – WATER
Unless otherwise specified in this contract, the Contractor shall provide and maintain at his/her own expense
an adequate supply of water suitable for purposes of performing the work.
ARTICLE 20 – WORKWEEK—CONSTRUCTION SCHEDULE(a) Unless furnished prior to contract award, the Contractor shall, prior to commencement of work, submit
to the Contracting Officer for approval: (1) a construction schedule showing the order in which he/she proposes
to carry on the work indicating the periods during which he/she will perform work on each item listed in the bidschedule; and (2) the hours and days in which he/she proposes to carry on the work.
(b) If, in the opinion of the Contracting Officer, the Contractor falls behind the approved construction
schedule, the Contractor shall take such steps as may be necessary to improve his/her process and theContracting Officer may require him/her to either increase the number of shifts, days or hours of work, or theamount of construction plant, or all of them, and to submit for approval such revised construction schedule as
may be deemed necessary to show the manner in which the agreed rate of progress will be regained, all without
additional cost to the Contracting Local Organization. If the Contractor fails to submit a revised construction
schedule within the time specified by the Contracting Officer, the Contracting Officer may withhold approval ofprogress payments and/or take such other actions as provided in this contract until such time as the Contractor
submits the required construction schedule.

IFB No. PCCD-22-PCW21Rehab-01

GC-8 of 18(c) Failure of the Contractor to comply with the requirements of the Contracting Officer under this article
shall be grounds for determination by the Contracting Officer that the Contractor is not prosecuting the workwith such diligence as will insure completion within the time specified. Upon such determination, theContracting Officer may terminate the Contractor’s right to proceed with the work, or any separable part thereof,in accordance with Article 5 of the General Conditions.
(d) The maximum workweek that will be approved is:- Monday through Saturday, up to 11 hours per day (not to exceed 60 hours per week).
- Work is permitted during “daylight” hours only.
(e) All work under this contract except minor items of work of an emergency, protective, or maintenance nature
will be suspended for the periods listed below. These days are included in the original contract performance time:2022: Memorial Day 5/30, Juneteenth 6/20, Independence Day 7/4, Labor Day 9/5, Columbus Day 10/10,
Veterans Day 11/11, Thanksgiving Break Nov. 24-26, Winter Break Dec. 19-31. 2023: New Year’s Day Jan. 1&2,
M.L. King Day 1/16, Presidents Day 2/20, Presidents Day 2/20, Memorial Day 5/29, Juneteenth 6/19,
Independence Day 7/4, Labor Day 9/4.
(f) If the contract performance time is extended after the contract is awarded due to weather and its effects,
or for other reasons, all work (except that of an emergency, protective, or maintenance nature) will besuspended on days listed below and the suspension days will be added to the performance time: 2023:
Columbus Day 10/9, Veterans Day 11/11, Thanksgiving Break Nov. 23-25, Winter Break Dec. 18-31.
ARTICLE 21 – SUBCONTRACTORS(a) Work shall not be subcontracted in whole or in part without the prior written approval of the Contracting
Officer. The request shall be in writing with the name and qualifications of the proposed subcontractor and a
description of the work to be done.
(b) If at any time the Contracting Officer determines that any subcontractor is incompetent or undesirable,
he/she shall notify the Contractor accordingly and the Contractor shall take immediate steps for cancellation of
the subcontract.
(c) Subcontracting by subcontractors shall be subject to the above requirements.
(d) Nothing contained in this contract shall create any contractual relationship between any subcontractor
and the Contracting Local Organization.
(e) Any subcontract awarded under this contract will not be awarded to any official of the Plum Creek
Conservation District, Texas State Soil and Water Conservation Board, Hays County Soil and Water
Conservation District, Caldwell-Travis Soil and Water Conservation District, or USDA-Natural Resources
Conservation Service (all in the State of Texas), or to any firm in which any official or any member of suchofficial’s immediate family of these entities has direct or indirect interest in the pecuniary profits or contracts ofsuch firms.
ARTICLE 22 – SURVEYS
See PART IV, Construction Specification 7 – Construction Surveys.
ARTICLE 23 – SUSPENSION OF WORK(a) The Contracting Officer may order the Contractor in writing to suspend, delay, or interrupt all or any partof the work for such period of time as he/she may determine to be appropriate for the convenience of theContracting Local Organization. See General Conditions Article 5(d)(4) regarding work suspensions due to
COVID-19.
(b) If the performance of all or any part of the work is, for an unreasonable period of time, suspended,
delayed, or interrupted by an act of the Contracting Officer in the administration of this contract, or by his/her
failure to act within the time specified in this contract (or if no time is specified, within a reasonable time), an
adjustment shall be made for any increase in the cost of performance of this contract (excluding profit)
necessarily caused by such unreasonable suspension, delay, or interruption and the contract modified in writing
accordingly. However, no adjustment shall be made under this article for any suspension, delay, or interruption
to the extent (1) that performance would have been so suspended, delayed, or interrupted by any other cause
including the fault or negligence of the Contractor or (2) for which an equitable adjustment is provided for or
excluded under any other provision of this contract.

IFB No. PCCD-22-PCW21Rehab-01

GC-9 of 18(c) No claim under this article shall be allowed (1) for any costs incurred more than 20 days before theContractor shall have notified the Contracting Officer in writing of the act or failure to act involved (but thisrequirement shall not apply as to a claim resulting from a suspension order), and(2) unless the claim, in an amount stated, is asserted in writing as soon as practicable after the termination ofsuch suspension, delay, or interruption, but not later than the date of final payment under the contract.
ARTICLE 24 – CLEANUP WORK(a) During performance of the work the Contractor shall keep the work site, areas adjacent to the work site
and access roads in an orderly condition, free and clear from debris and discarded materials. Care shall betaken to prevent spillage when hauling is being done. Any spillage or debris resulting from the Contractor’soperations shall be immediately removed.
(b) Upon completion of the work the Contractor shall remove from the work site, areas adjacent to the worksite and access roads: all plant, buildings, debris, unused materials, concrete forms and other like material
belonging to Contractor or used under his/her direction during the construction. Contractor shall grade allaccess roads, other than public, removing wheel tracks and smoothing up such roads.
ARTICLE 25 – ASSIGNMENTThe Contractor shall not assign in whole or in part this contract without the prior written consent of theContracting Local Organization. The Contractor shall not assign any moneys due or to become due to him/her
under this contract without the prior written consent of the Contracting Local Organization.
ARTICLE 26 – WEATHER(a) The Contracting Officer may order suspension of the work in whole or in part, commencing with the day
after receipt of the Notice to Proceed by the Contractor, due to weather or the effects of weather at the site, forsuch time as he/she considers it unfavorable for satisfactory prosecution of the work.
(b) When the Contracting Officer orders suspension under (a) of this article, the contract completion dateshall be extended a full calendar day for each calendar day during suspension of the work if:(1) All work is suspended except minor items as may be designated in this contract or as approved
during the suspension period by the Contracting Officer at his/her sole discretion on a case-by-case basis (workof an emergency, protective or maintenance nature may be performed at any time); and(2) The hours lost in any one workday of the authorized workweek through suspension equal one-halfor more of the hours of an authorized workday.
(c) If the Contracting Officer orders suspension of work as provided in (b) of this article and the hours lostin the workday immediately preceding a nonworkday equal one-half or more of the hours in an authorized
workday, the contract completion date shall be extended a full calendar day for each nonworkday duringsuspension of the work.
(d) When the Contracting Officer orders any suspension of the work under this article, the Contractor shallnot be entitled to any cost or damages resulting from such suspension.
(e) When the contract completion date is extended under this article, the contract shall be modified inwriting accordingly.
ARTICLE 27 – NONCOMPLIANCE WITH CONTRACT REQUIREMENTS(a) The Contracting Officer may order suspension of the work in whole or in part for such time as he/she
deems necessary because of the failure of the Contractor to comply with any of the requirements of thiscontract, and the contract completion date shall not be extended on account of any such suspension of thework.
(b) When the Contracting Officer orders any suspension of the work under (a) of this article, the Contractor
shall not be entitled to any costs or damages resulting from such suspension.
(c) The rights and remedies of the Contracting Local Organization provided in this article are in addition to
any other rights and remedies provided by law or under this contract.
ARTICLE 28 – QUANTITY VARIATIONS(a) Where the quantity of work shown for an item in the bid schedule, including any modification thereof, isestimated, no adjustment of the contract price nor of the performance time shall be made for overruns orunderruns which are within 25 percent of the estimated quantity of any such item.

IFB No. PCCD-22-PCW21Rehab-01

GC-10 of 18(b) For overruns of more than 25 percent, the Contracting Officer shall re-estimate the quantity for the item,
establish an equitable contract price for the overrun of more than 25 percent, adjust contract performance time
equitably, and modify the contract in writing accordingly; this article to thereafter be applicable to the total reestimated item quantity.
(c) For underruns of more than 25 percent, the Contracting Officer shall determine the quantity for the item,
establish an equitable contract price therefor, adjust contract performance time equitably, and modify thecontract in writing accordingly.
ARTICLE 29 – FEDERAL, STATE, AND LOCAL TAXES(a) Except as otherwise provided, contract unit prices shall include all applicable Federal, State, and local
taxes.
(b) Texas State, County, and Municipal Sales and Use Tax. (1) The Contracting Local Organization is an
exempt entity per §151.309(5) of the Limited Sales, Excise, and Use Tax Act (Texas Tax Code Chapter 151 –Limited Sales, Excise, and Use Tax) and will issue the Contractor an affidavit as proof of this exemption. This
contract is a “lump-sum contract” as defined by Texas Administrative Code, Title 34, Part 1, Chapter 3,
Subchapter O – State Sales and Use Tax, Rule §3.291 (Contractors).
(2) When purchased by the Contractor for use in performance of this contract, certain tangible personal
property and taxable services are exempt from State Sales and Use Tax under Texas Tax Code §151.311,
and in most cases are also exempt from County and Municipal Sales and Use Tax. Contractor is subject totax responsibilities in Texas Administrative Code Rule §3.291, section (c), and is responsible to issue a properly
completed exemption certificate to a supplier in accordance with section (c)(5).
(3) Contractor is solely responsible to be adequately familiar with and comply with all requirements ofTexas Tax Code, Texas Administrative Codes, and any other State/local regulations when claiming tax
exemption for purchase of items for use in the performance of this contract.
(4) “Contractor” as used in this paragraph (b) includes subcontractors as defined in Texas
Administrative Code Rule §3.291, section (a)(3).
ARTICLE 30 – SHOP DRAWINGS(a) The term “shop drawings” includes drawings, diagrams, layouts, schematics, descriptive literature,illustrations, schedules, performance and test data, and similar materials furnished by the Contractor to explainin detail specific portions of the work required by the contract.
(b) If this contract requires shop drawings, the Contractor shall coordinate all such drawings, and review
them for accuracy, completeness, and compliance with contract requirements and shall indicate his/her
approval thereon as evidence of such coordination and review. Shop drawings submitted to the Contracting
Officer without evidence of the Contractor’s approval may be returned for resubmission. The Contracting
Officer will indicate his/her approval or disapproval of the shop drawings and if not approved as submitted shallindicate his/her reasons therefor. Any work done prior to such approval shall be at the Contractor’s risk.
Approval by the Contracting Officer shall not relieve the Contractor from responsibility for any errors oromissions in such drawings, nor from responsibility for complying with the requirements of this contract, except
with respect to variations described and approved in accordance with (c) below.
(c) If shop drawings show variations from the contract requirements, the Contractor shall describe suchvariations in writing, separate from the drawings, at the time of submission. If the Contracting Officer approves
any such variation(s), he/she shall issue an appropriate contract modification, except that, if the variation isminor and does not involve a change in price or in time of performance, a modification need not be issued.
ARTICLE 31 – TERMINATION FOR CONVENIENCE OF THE CONTRACTING LOCAL ORGANIZATIONThe Contracting Officer, by written notice, may terminate this contract in whole or in part, when it is in theinterest of the Contracting Local Organization. If this contract is so terminated, the Contractor shall becompensated for all necessary and reasonable direct costs of performing the work actually accomplished. In
addition, the Contractor shall be paid 10 percent for overhead expenses based on said direct costs, and 5
percent for profit based on the total of direct costs and overhead costs. From this will be deducted any
payments or reimbursements previously paid and salvage value of materials paid for by the Contracting Local
Organization but not used. Provided however, no profit shall be paid if the Contractor would have incurred aloss had the entire contract been completed.

IFB No. PCCD-22-PCW21Rehab-01

GC-11 of 18

ARTICLE 32 – PROTECTION OF EXISTING VEGETATION, STRUCTURES, EQUIPMENT, UTILITIES,AND IMPROVEMENTS(a) The Contractor shall preserve and protect all structures, equipment, and vegetation (such as trees,
shrubs, and grass) on or adjacent to the work site, which are not to be removed and which do notunreasonably interfere with the work required under this contract. The Contractor shall only remove trees
when specifically authorized to do so, and shall avoid damaging vegetation that will remain in place. If any
limbs or branches of trees are broken during contract performance, or by the careless operation ofequipment, or by workmen, the Contractor shall trim those limbs or branches with a clean cut and paint the
cut with a tree-pruning compound as directed by the Contracting Officer.
(b) The Contractor shall protect from damage all existing improvements and utilities (1) at or near thework site, and (2) on adjacent property of a third party, the locations of which are made known to or should
be known by the Contractor. The Contractor shall repair any damage to those facilities, including thosethat are the property of a third party, resulting from failure to comply with the requirements of this contract
or failure to exercise reasonable care in performing the work. If the Contractor fails or refuses to repair thedamage promptly, the Contracting Officer may have the necessary work performed and charge the cost to
the Contractor.
ARTICLE 33 – OPERATIONS AND STORAGE AREAS(a) The Contractor shall confine all operations (including storage of materials) on Contracting Local
Organization premises to areas authorized or approved by the Contracting Officer. The Contractor shallhold and save the Contracting Local Organization, its officers and agents, free and harmless from liabilityof any nature occasioned by the Contractor's performance.
(b) Temporary buildings (e.g., storage sheds, shops, offices) and utilities may be erected by theContractor only with the approval of the Contracting Officer and shall be built with labor and materials
furnished by the Contractor without expense to the Contracting Local Organization. The temporary
buildings and utilities shall remain the property of the Contractor and shall be removed by the Contractor atits expense upon completion of the work. With the written consent of the Contracting Officer, the buildings
and utilities may be abandoned and need not be removed.
(c) The Contractor shall, under regulations prescribed by the Contracting Officer, use only establishedroadways, or use temporary roadways constructed by the Contractor when and as authorized by theContracting Officer. When materials are transported in prosecuting the work, vehicles shall not be loaded
beyond the loading capacity recommended by the manufacturer of the vehicle or prescribed by any Federal,
State, or local law or regulation. When it is necessary to cross curbs or sidewalks, the Contractor shallprotect them from damage. The Contractor shall repair or pay for the repair of any damaged curbs,
sidewalks, or roads.
ARTICLE 34 – USE AND POSSESSION PRIOR TO COMPLETION(a) The Contracting Local Organization shall have the right to take possession of or use any completed
or partially completed part of the work. Before taking possession of or using any work, the Contracting
Officer shall furnish the Contractor a list of items of work remaining to be performed or corrected on thoseportions of the work that the Contracting Local Organization intends to take possession of or use. However,
failure of the Contracting Officer to list any item of work shall not relieve the Contractor of responsibility forcomplying with the terms of the contract. The Contracting Local Organization's possession or use shall not
be deemed an acceptance of any work under the contract.
(b) While the Contracting Local Organization has such possession or use, the Contractor shall be
relieved of the responsibility for the loss of or damage to the work resulting from the Contracting Local
Organization's possession or use, notwithstanding the terms of Article 11 (Permits and Responsibilities) ofthese General Conditions. If prior possession or use by the Contracting Local Organization delays the
progress of the work or causes additional expense to the Contractor, an equitable adjustment shall be madein the contract price or the time of completion, and the contract shall be modified in writing accordingly.
ARTICLE 35 – LAYOUT OF WORK
See PART IV, Construction Specification 7 – Construction Surveys.

IFB No. PCCD-22-PCW21Rehab-01

GC-12 of 18

ARTICLE 36 – PRECONSTRUCTION CONFERENCE
If the Contracting Officer decides to conduct a preconstruction conference, the successful offeror will be
notified and will be required to attend. The Contracting Officer's notification will include specific details
regarding the date, time, and location of the conference, any need for attendance by subcontractors, andinformation regarding the items to be discussed.
ARTICLE 37 – CONTRACTOR RECORDS(a) Access to Records. Contractor shall provide access by Contracting Local Organization, Texas State
Soil and Water Conservation Board, Texas State Auditor’s Office, or USDA-Natural Resources Conservation
Service, or any of their duly authorized representatives, to any books, documents, papers, and records of theContractor which are directly pertinent to the contract for the purpose of making audit, examination, excerpts,
and transcriptions.
(b) Retention of Records. Contractor shall retain all records requiring access per paragraph (a) above forseven (7) years after the Contracting Local Organization makes final payment under the contract and all otherpending matters between the Contracting Local Organization and the Contractor under the contract are closed.
ARTICLE 38 – ARCHEOLOGICAL OR HISTORIC SITES
If a previously unidentified archeological or historic site(s) is encountered, the Contractor shall discontinue workin the general area of the site(s) and notify the Contracting Officer immediately.
ARTICLE 39 – CONTROL OF EROSION, SEDIMENTATION, AND POLLUTION(a) Operations shall be scheduled and conducted to minimize erosion of soils and to prevent silting andmuddying of streams, rivers, irrigation systems, and impoundments (lakes, reservoirs, etc.).
(b) Pollutants such as fuels, lubricants, bitumens, raw sewage, and other harmful materials shall not bedischarged on the ground; into or nearby rivers, streams, or impoundments; or into natural or man-madechannels. Wash water or waste from concrete or aggregate operations shall not be allowed to enter live
streams prior to treatment by filtration, settling, or other means sufficient to reduce the sediment content to
not more than that of the stream into which it is discharged.
(c) Mechanized equipment shall not be operated in flowing streams without written approval by theContracting Officer.
ARTICLE 40 – [RESERVED]
ARTICLE 41 – ACCIDENT PREVENTION AND SAFETY(a) The Contractor shall provide and maintain work environments and procedures which will:(1) Safeguard the public and Contracting Local Organization personnel, property, materials,
supplies, and equipment exposed to Contractor operations and activities;(2) Avoid interruptions of Contracting Local Organization operations and delays in projectcompletion dates; and(3) Control costs in the performance of this contract.
(b) Whenever the Contracting Officer becomes aware of any noncompliance with these requirements
or any condition which poses a serious or imminent danger to the health or safety of the public orContracting Local Organization personnel, the Contracting Officer shall notify the Contractor orally, withwritten confirmation, and request immediate initiation of corrective action. This notice, when delivered to
the Contractor or the Contractor's representative at the work site, shall be deemed sufficient notice of thenoncompliance and that corrective action is required. After receiving the notice, the Contractor shallimmediately take corrective action. If the Contractor fails or refuses to promptly take corrective action, theContracting Officer may issue an order stopping all or part of the work until satisfactory corrective action
has been taken. The Contractor shall not be entitled to any equitable adjustment of the contract price or
extension of the performance schedule on any stop work order issued under this article.
(c) The Contractor shall insert this article, including this paragraph (c), with appropriate changes in thedesignation of the parties, in subcontracts.
(d) Before commencing the work, the Contractor shall-(1) Submit a written proposed plan for implementing this article. The plan shall include an analysis

IFB No. PCCD-22-PCW21Rehab-01

GC-13 of 18

of the significant hazards to life, limb, and property inherent in contract work performance and a plan forcontrolling these hazards; and(2) Meet with representatives of the Contracting Officer to discuss and develop a mutual
understanding relative to administration of the overall safety program.
(e) In the event there is a conflict between the requirements contained in the specifications, Contractor’ssafety program, and U.S. Department of Labor construction safety and health standards, the more stringent
requirement will prevail.
(f) Contractor shall comply with OSHA (Occupational Safety and Health Administration) Parts 1910 and
1926 Construction Industry Standards and Interpretations, and with the supplement below:
Supplement to OSHA Parts 1910 and 1926 Construction
Industry Standards and Interpretations
Requests for variances or waiver from this supplement are to be made to the Contracting Officer in writing
supported by evidence that every reasonable effort has been made to comply with the contractual
requirements. A written request for a waiver or a variance shall include-(1)(2)(3)

Specific reference to the provision or standard in question;
An explanation as to why the waiver is considered justified; andThe Contractor's proposed alternative, including technical drawings, materials, or equipment
specifications needed to enable Contracting Officer to render a decision.

No waiver or variance will be approved if it endangers any person. The Contractor shall not proceed under
any requested revision of a provision until the Contracting Officer has given written approval. The
Contractor is to hold and save harmless the United States Department of Agriculture, Natural Resources
Conservation Service, Texas State Soil and Water Conservation Board, and the Contracting Local
Organization free from any claims or causes of action whatsoever resulting from the Contractor or
Subcontractors proceeding under a waiver or approved variance.
Copies of OSHA Parts 1910 and 1926, Construction Industry Standards and Interpretations, may beobtained from:Superintendent of Documents
U.S. Government Printing Office
Washington, DC 20402
A. GENERAL CONTRACTOR REQUIREMENTS(1) SAFETY PROGRAM. Each Contractor is to demonstrate that he or she has facilities for conducting
a safety program commensurate with the work under contract. The Contractor is to submit in writing a
proposed comprehensive safety program to the Contracting Officer for approval before the start ofoperations. The program is to specifically state what provisions the Contractor proposes to take for thehealth and safety of all employees, including subcontractors and rental equipment operators. The program
shall be site specific and provide details relevant to the work to be done, the hazards associated with thework, and the actions that will be necessary to minimize the identified hazards.
(2) PRECONSTRUCTION SAFETY MEETING. Representatives for the Contractor are to meet with
the Contracting Officer or the CO’s Representative before commencing work to discuss the safety program
and the implementation of all health and safety standards pertinent to the work under this contract.
(3) JOINT SAFETY POLICY COMMITTEE. The Contractor or designated on-site representative is toparticipate in monthly meetings of a joint Safety Policy Committee, composed of Contracting Officer, CLO
Engineer and/or Inspector, and Contractor supervisory personnel. At these meetings the Contractor's
project manager and the Contracting Officer will review the effectiveness of the Contractor's safety effort,
resolve current health and safety problems, and coordinate safety activities for upcoming work.
(4) SAFETY PERSONNEL. Each Contractor is to designate a competent supervisory employee
satisfactory to Contracting Officer to administer the safety program.

IFB No. PCCD-22-PCW21Rehab-01

GC-14 of 18(5) SAFETY MEETINGS. A minimum of one "on-the-job" or "toolbox" safety meeting is to be conductedeach week by all field supervisors or foremen and attended by mechanics and all personnel at the jobsite.
The Contractor is to also conduct regularly scheduled supervisory safety meetings at least monthly for all
levels of job supervision.
(6) SAFETY INSPECTION. The Contractor shall perform frequent and regular safety inspections of thejobsite, materials, and equipment, and shall correct deficiencies.
(7) FIRST AID TRAINING. Every Contractor foreman's work crew must include an employee who hasa current first aid certificate from the Mine Safety and Health Administration, American Red Cross, or otherstate-approved organization.
(8) REPORTS. Each contractor is to maintain an accurate record of all job-related deaths, diseases,or disabling injuries. The records shall be maintained in a manner approved by the Contracting Officer. A
copy of all reports is to be provided to the Contracting Officer. All fatal or serious injuries are to be reported
immediately to the Contracting Officer, and every assistance is to be given in the investigation of theincident, including submission of a comprehensive narrative report to the Contracting Officer. Other
occurrences with serious accident potential, such as equipment failures, slides, and cave-ins, must also bereported immediately. The Contractor is to assist and cooperate fully with the Contracting Officer in
conducting accident investigations. The Contracting Officer is to be furnished all information and data
pertinent to investigation of an accident.
(9) CERTIFICATION OF INSURANCE. Contractors are to provide the Contracting Officer withcertificates of insurance before the start of operations indicating full compliance with State Worker's
Compensation statutes, as well as other certificates of insurance required under the contract. [See PARTIII – Supplemental Conditions, Articles 1, 2, and 3.]
B. FIRST AID AND MEDICAL FACILITIES(1) FIRST AID KITS. A 16-unit first aid kit approved by the American Red Cross is to be provided ataccessible, well-identified, locations at the ratio of at least 1 kit for each 25 employees. The first aid kits
are to be moistureproof and dusttight, and the contents of the kits are to be replenished as used or as they
become ineffective or outdated.
(2) EMERGENCY FIRST AID. At least one employee certified to administer emergency first aid must
be available on each shift and duly designated by the Contractor to care for injured employees. The namesof the certified employees shall be posted at the jobsite.
(3) COMMUNICATION AND TRANSPORTATION. Prior to the start of work, the Contractor is to makenecessary arrangements for prompt and dependable communications, transportation, and medical care for
injured employees. At least one stretcher and two blankets shall be readily available for transporting injured
employees.
(4) FIRST AID AND MEDICAL REPORTS. The Contractor is to maintain a record system for first aid
and medical treatment on the jobsite. Such records are to be readily available to the Contracting Officer
and are to include-(a) A daily treatment log listing chronologically all persons treated for occupational injuries andillnesses;(b) Cumulative record of injury for each individual;(c) Monthly statistical records of occupational injuries, classified by type and nature of injury; and(d) Required records for worker's compensation.
(5) SIGNS AND DIRECTIONAL MARKINGS. Adequate identification and directional markers are to beprovided to readily denote the location of all first aid stations.
(6) EMERGENCY LISTING. A listing of telephone numbers and addresses of doctor, rescue squad,hospital, police, and fire departments is to be provided at all first aid locations.

IFB No. PCCD-22-PCW21Rehab-01

GC-15 of 18

C. PHYSICAL QUALIFICATIONS OF EMPLOYEES(1) GENERAL REQUIREMENTS. Persons employed throughout the contract are to be physicallyqualified to perform their assigned duties. Employees must not knowingly be permitted or required to work
while their ability or alertness is impaired by fatigue, illness, or any other reason that may jeopardize
themselves or others.
(2) HOIST OPERATORS. Operators of cranes, cableways, and other hoisting equipment shall be
examined annually by a physician and provided with a certification stating that they are physically qualified
to safely operate hoisting equipment. The Contractor is to submit a copy of each certification to theContracting Officer.
(3) HEAVY EQUIPMENT OPERATORS. It is recommended that operators of trucks and heavyequipment be given physical examinations to determine if they are physically qualified to perform theirassigned work without endangering themselves or others.
(4) MOTOR VEHICLE OPERATORS. Operators of motor vehicles engaged primarily in thetransportation of personnel are to be 18 years of age or older and have a valid state operator's permit orlicense for the equipment being operated. The operators must have passed a physical exam administeredby a licensed physician within the past year showing that they are qualified to operate vehicles safely.
D. PERSONAL PROTECTIVE EQUIPMENT(1) HARD HAT AREAS. The entire jobsite, with the exception of offices, shall be considered a hard hat
area. All persons entering the area are, without exception, required to wear hard hats. The Contractor
shall provide hard hats for visitors entering hard hat areas.
(2) LABELS. Hard hats shall bear a manufacturer's label indicating design compliance with theappropriate ANSI (American National Standards Institute) standard.
(3) POSTING.
(a) Signs at least 3 by 4 feet worded as follows with red letters (minimum 6 inches high) and whitebackground shall be erected at access points to designated hard hat areas:
CONSTRUCTION AREA - HARD HATSREQUIRED BEYOND THIS POINT(b) These signs are to be furnished and installed by the Contractor at entries to shops, service yards,
and job access points.
(4) SAFETY GOGGLES (DRILLERS). DRILLERS AND HELPERS. Drillers and helpers operating
pneumatic rock drills must wear protective safety goggles.
E. MACHINERY AND MECHANIZED EQUIPMENT(1) SAFE CONDITION. Before any machinery or mechanized equipment is initially used on the job, it
must be inspected and tested by qualified personnel and determined to be in safe operating condition andappropriate for the intended use. Operators shall inspect their equipment prior to the beginning of eachshift. Any deficiencies or defects shall be corrected prior to using the equipment. Safety equipment, suchas seatbelts, installed on machinery is to be used by equipment operators.
(2) TAGGING AND LOCKING. The controls of power-driven equipment under repair are to be locked.
An effective lockout and tagging procedure is to be established, prescribing specific responsibilities andsafety procedures to be followed by the person or persons performing repair work. Mixer barrels are to be
securely locked out before permitting employees to enter them for cleaning or repair.
(3) HAUL ROADS FOR EQUIPMENT(a) ROAD MAINTENANCE. The Contractor shall maintain all roadways, including haul roads andaccess roads, in a safe condition so as to eliminate or control dust and ice hazards. Wherever dust is ahazard, adequate dust-laying equipment shall be available at the jobsite and utilized to control the dust.

IFB No. PCCD-22-PCW21Rehab-01

GC-16 of 18(b) SINGLE-LANE HAUL ROADS. Single-lane haul roads with two-way traffic shall have adequate
turnouts. Where turnouts are not practical, a traffic control system shall be provided to prevent accidents.
(c) TWO-WAY HAUL ROADS. On two-way haul roads, arrangements are to be such that vehicles
travel on the right side wherever possible. Signs and traffic control devices are to be employed to indicate
clearly any variations from a right-hand traffic pattern. The road shall be wide enough to permit safe
passage of opposing traffic, considering the type of hauling equipment used.
(d) DESIGN AND CONSTRUCTION OF HAUL ROADS. Haul road design criteria and drawings, if
requested by the Contracting Officer, are to be submitted for approval prior to road construction. Sustained
grades shall not exceed 12 percent and all curves shall have open-sight line with as great a radius aspractical. All roads shall be posted with curve signs and maximum speed limits that will permit theequipment to be stopped within one-half the minimum sight distance.
(e) OPERATORS. Machinery and mechanized equipment shall be operated only by authorized
qualified persons.
(f) RIDING ON EQUIPMENT. Riding on equipment by unauthorized personnel is prohibited.
Seating and safety belts shall be provided for the operator and all passengers.
(g) GETTING ON OR OFF EQUIPMENT. Getting on or off equipment while the equipment is inmotion is prohibited.
(h) HOURS OF OPERATION. Except in emergencies, an equipment operator shall not operate any
mobile or hoisting equipment for more than 12 hours without an 8-hour rest interval away from the job.
(4) POWER CRANES AND HOISTS (TRUCK CRANES, CRAWLER CRANES, TOWER CRANES,GANTRY CRANES, HAMMERHEAD CRANES, DERRICKS, CABLEWAYS, AND HOISTS)(a) PERFORMANCE TEST. Before initial on-site operation, at 12-month intervals, and after major
repairs or modification, power cranes, derricks, cableways, and hoists must satisfactorily complete a
performance test to demonstrate the equipment's ability to safely handle and maneuver the rated loads.
The tests shall be conducted in the presence of a representative of the Contracting Officer (the Engineer
and/or Inspector). Test data shall be recorded and a copy furnished to the Contracting Officer.
(b) PERFORMANCE TEST--POWER CRANES (CRAWLER MOUNTED, TRUCK MOUNTED, AND
WHEEL MOUNTED). The performance test is to be carried out as per ANSI requirements. The test is toconsist of raising, lowering and braking the load and rotating the test load through 360º at the specified
boom angle or radius. Cranes equipped with jibs or boom tip extensions are to be tested using both themain boom and the jib, with an appropriate test load in each case.
(c) PERFORMANCE TEST--DERRICKS, GANTRY CRANES, TOWER CRANES, CABLEWAYS,
AND HOISTS, INCLUDING OVERHEAD CRANES. This equipment is to be performance tested as perwith ANSI requirements.
(d) BOOM ANGLE INDICATOR. Power cranes (including draglines) with booms capable of moving
in the vertical plane shall be provided with a boom angle indicator in good working order.
(e) CRANE TEST CERTIFICATION. The performance test required by (4)(b) and (c) is fulfilled if
the Contractor provides the Contracting Officer a copy of the certificate of inspection made within the past
12 months by a qualified person or by a government or private agency satisfactory to the Contracting
Officer.
(f) POSTING FOR HIGH VOLTAGE LINES. A notice of the 10-foot (or greater) clearance requiredby OSHA 1926.550, Subpart N, shall be posted in the operator's cab of cranes, shovels, boom-type
concrete pumps, backhoes, and related equipment.
(g) BOOM STOPS. Cranes or derricks with cable-supported booms, except draglines, shall have a
device attached between the gantry of the A-frame and the boom chords to limit the elevation of the boom.
The device shall control the vertical motions of the boom with increasing resistance from 83° or less, until
completely stopping the boom at not over 87° above horizontal.

IFB No. PCCD-22-PCW21Rehab-01

GC-17 of 18(h) SAFETY HOOKS. Hooks used in hoisting personnel or hoisting loads over construction
personnel or in the immediate vicinity of construction personnel shall be forged steel equipped with safety
keepers. When shackles are used under these conditions, they shall be of the locking type or have the pin
secured to prohibit turning.
(5) ROLLOVER PROTECTIVE STRUCTURES (ROPS)(a) ROLLOVER PROTECTIVE STRUCTURES. OSHA 1926, Subpart W, Overhead Protection,
Sections 1001 and 1002 are applicable regardless of the year in which the equipment was manufactured
and regardless of the struck capacity of the equipment.
(b) EQUIPMENT REQUIRING ROPS. The requirement for ROPS meeting (5)(a) above applies tocrawler and rubber-tired tractors such as dozers, push-and-pull tractors, winch tractors, tractors withbackhoes, and mowers; off-highway, self-propelled, pneumatic-tired earthmovers, including scrapers,
motor graders and loaders; and rollers, compactors, water tankers (excluding trucks with cabs). These
requirements shall also apply to agricultural and industrial tractors and similar equipment.
(c) EQUIPMENT REQUIRING SEATBELTS. The requirements for seatbelts as specified in OSHA
Subpart 0, Motor Vehicles, Mechanized Equipment, and Marine Operations, Section 1926.602 shall also
apply to self-propelled compactors and rollers, and rubber-tired skid-steer equipment.
F. LADDERS AND SCAFFOLDING(1) LADDERS. OSHA 1926, Subpart L - Section 450. Ladders shall be used as work platforms only
when use of small hand tools or handling of light material is involved. No work requiring lifting of heavymaterials or substantial exertion shall be done from ladders.
(2) SCAFFOLDING. OSHA 1926, Subpart L - Section 451. Scaffolds, platforms or temporary floors
shall be provided for all work except that which can be done safely from the ground or similar footing.
(3) SAFETY BELTS, LIFELINE, AND LANYARDS. OSHA 1926, Subpart E, Section 104. Lifelines,
safety belts and lanyards independently attached or attended, shall be used when performing such workas the following when the requirements of F(1) or (2) above cannot be met.
(a) Work on stored material in hoppers, bins, silos, tanks, or other confined spaces.
(b) Work on hazardous slopes, structural steel, or poles; erection or dismantling of safety nets, tying
reinforcing bars; and work from Boatswain's chairs, swinging scaffolds, or other unguarded locations atelevations greater than 6 feet.
(c) Work on skips and platforms used in shafts by crews when the skip or cage does not block the
opening to within 1 foot of the sides of the shaft, unless cages are provided.

IFB No. PCCD-22-PCW21Rehab-01

GC-18 of 18

This page intentionally left blank.

IFB No. PCCD-22-PCW21Rehab-01

PART III - Contents

PART III
SUPPLEMENTAL CONDITIONS

Table of Contents
Page No.
ARTICLE 1

TYPES AND LIMITS OF INSURANCE ............................................................ SC-1

ARTICLE 2

SETTLEMENT OF INSURANCE CLAIMS ...................................................... SC-2

ARTICLE 3

WORKERS’ COMPENSATION INSURANCE COVERAGE............................ SC-2

ARTICLE 4

POST-AWARD INFORMATION ...................................................................... SC-4

ARTICLE 5PERFORMANCE OF WORK BY CONTRACTOR .......................................... SC-4

ARTICLE 6

COMMENCEMENT, PROSECUTION, AND
COMPLETION OF WORK .............................................................................. SC-4

ARTICLE 7

VENUE ............................................................................................................. SC-4

ARTICLE 8

WAGES / BENEFITS ....................................................................................... SC-4

ARTICLE 9ETHICS / CONFLICTS OF INTEREST............................................................ SC-5

ARTICLE 10

PROTESTS ...................................................................................................... SC-6

ARTICLE 11

DISPUTES / ALTERNATIVE DISPUTE RESOLUTION .................................. SC-7

ARTICLE 12

INDEMNIFICATION CLAUSE .......................................................................... SC-8

ARTICLE 13

PERFORMANCE AND PAYMENT BONDS .................................................... SC-9

ARTICLE 14

EQUAL OPPORTUNITY (FEDERALLYASSISTED CONSTRUCTION) ........................................................................ SC-9

ARTICLE 15

NOTICE TO PROSPECTIVE FEDERALLYASSISTED CONSTRUCTION CONTRACTORS(Certification of Nonsegregated Facilities) ..................................................... SC-10

ARTICLE 16

STANDARD FEDERAL EQUAL EMPLOYMENTOPPORTUNITY CONSTRUCTION CONTRACT
SPECIFICATIONS (EXECUTIVE ORDER 11246) ........................................ SC-11

ARTICLE 17

CERTIFICATION REGARDING DEBARMENT,SUSPENSION, INELIGIBILITY & VOLUNTARYEXCLUSION—LOWER TIER COVERED TRANSACTIONS ........................ SC-14

SC-i

IFB No. PCCD-22-PCW21Rehab-01

PART III - Contents

Page No.

ARTICLE 17A

TEXAS CERTIFICATION REGARDING DEBARMENT,SUSPENSION, INELIGIBILITY & VOLUNTARYEXCLUSION—LOWER TIER COVERED TRANSACTIONS ........................ SC-15

ARTICLE 18

CERTIFICATION REGARDING LOBBYINGCERTIFICATION FOR CONTRACTS, GRANTS,
LOANS, AND COOPERATIVE AGREEMENTS ............................................ SC-15

ARTICLE 19

CLEAN AIR AND WATER CLAUSE / CERTIFICATION ............................... SC-16

ARTICLE 20

SUBCONTRACTOR CERTIFICATION – TPDES ......................................... SC-17

SC-ii

IFB No. PCCD-22-PCW21Rehab-01

SC-1 of 18

PART III - SUPPLEMENTAL CONDITIONSARTICLE 1 – TYPES AND LIMITS OF INSURANCE
Satisfactory certificates of insurance (COI) shall be filed with Contracting Local Organization prior tocommencement of any work on this contract. Plum Creek Conservation District shall be listed as Certificate
Holder. All approved Subcontractors also must file COI with PCCD that meets these Article 1 requirements.
Insurance requirements stated below do not establish limits of the Contractor’s or Subcontractor’s liability.
(a) Workmen's Compensation and Employer's Liability Insurance(1) Contractor shall provide workmen’s compensation and employee’s liability insurance at own
expense. This insurance shall protect Contractor against all claims under applicable state workmen'scompensation laws. Contractor shall also be protected against claims for injury, disease, or death of
employees which, for any reason, may not fall within the provisions of a workmen's compensation law.
(2) The liability limits shall be not less than:
Workmen's Compensation
Statutory
Employer's Liability$500,000(b) Comprehensive Automobile Liability Insurance(1) Contractor shall provide comprehensive automobile liability insurance at own expense. This
insurance shall be written in comprehensive form and shall protect Contractor against all claims for injuries tomembers of the public and damage to property of others arising from the use of motor vehicles, and shall cover
operation on or off the site of all motor vehicles licensed for highway use, whether they are owned, non-owned,or hired.
(2) Policy shall list CLO as additional named insured per Article 1(f).
(3) The liability limits shall be not less than:
Combined single limit:$1 million each accident(c) Comprehensive General Liability Insurance(1) Contractor shall provide comprehensive general liability insurance at own expense. This
insurance shall be written in comprehensive form and shall protect Contractor against all claims arisingfrom injuries to persons other than his/her employees or damage to property of Contracting Local
Organization or others arising out of any act or omission of Contractor or his/her agents, employees, or
subcontractors. The policy shall also include protection against claims insured by usual personal injury
liability coverage, such as a "protective liability" endorsement to insure the contractual liability assumed byContractor.
(2) To the extent that Contractor's work, or work under his/her direction, may require blasting, explosive
conditions, or underground operations, the comprehensive general liability coverage shall contain no exclusion
relative to blasting, explosion, collapse of building, or damage to underground property.
(3) Policy shall list CLO as additional named insured per Article 1(f).
(4) The liability limits shall be not less than:
Bodily injury$1 million each occurrence
Property damage$1 million each occurrence

Aggregate$2 million(d) Umbrella Liability Policy. If aggregate of Comprehensive General Liability Insurance in (c)(4) above
does not equal or exceed $2 million, the Contractor shall provide umbrella liability policy at its own expense.
This insurance shall protect Contractor against all claims in excess of the limits provided under theworkmen's compensation and employer's liability, comprehensive automobile liability, and general liability
policies. The liability limits of the umbrella liability policy shall not be less than $2 million. The policy shalllist CLO as additional named insured per Article 1(f).
(e) Policy Cancellation. Each policy shall contain a provision that the coverage afforded will not becanceled or materially changed until at least 30 days prior written notice has been given to the Contracting
Local Organization or Contracting Officer.

IFB No. PCCD-22-PCW21Rehab-01

SC-2 of 18(f) Additional Named Insured. The Contracting Local Organization (CLO) shall be listed as an additional
named insured on Comprehensive Automobile Liability, Comprehensive General Liability, and Umbrella
Liability policies(g) Waiver of Subrogation. All policies of insurance shall waive all rights of subrogation against theContracting Local Organization, its officers, employees and agents.
ARTICLE 2 – SETTLEMENT OF INSURANCE CLAIMS
Losses insured under policies that include Contracting Local Organization, as a named insured, shall be
adjusted with Contracting Local Organization and made payable to Contracting Local Organization as trustee
for the insureds, as their interests may appear.
ARTICLE 3 – WORKERS’ COMPENSATION INSURANCE COVERAGE
Contractor shall provide worker’s compensation insurance coverage as specified below at own expense.
(a) Definitions. (1) Certificate of coverage (“certificate”)—A copy of a certificate of insurance, a certificate
of authority to self-insure issued by the TX Department of Insurance, Division of Workers’ Compensation, or acoverage agreement (DWC Form-81, DWC Form-82, DWC Form-83, or DWC Form-84), showing statutory
workers’ compensation insurance coverage for the person’s or entity’s employees providing services on a
project, for the duration of the project.
(2) Duration of the project—Includes the time from the beginning of the work on the project until theContractor’s/person’s work on the project has been completed and accepted by the Contracting Local
Organization.
(3) Persons providing services on the project (“subcontractor” in §406.096, Texas Labor Code) includes
all persons or entities performing all or part of the services the Contractor has undertaken to perform on the
project, regardless of whether that person contracted directly with the Contractor and regardless of whether
that person has employees. This includes, without limitation, independent contractors, subcontractors,
leasing companies, motor carriers, owner-operators, employees of any such entity, or employees of any
entity which furnishes persons to provide services on the project. “Services” include, without limitation,
providing, hauling, or delivering equipment or materials, or providing labor, transportation, or other service
related to a project. “Services” does not include activities unrelated to the project, such as food/beverage
vendors, office supply deliveries, and delivery of portable toilets.
(b) The Contractor shall provide coverage, based on proper reporting of classification codes and payroll
amounts and filing of any coverage agreements, which meets the statutory requirements of Texas Labor Code,
Section 401.011 (44) for all employees of the Contractor providing services on the project, for the duration of
the project.
(c) The Contractor must provide a certificate of coverage to the Contracting Local Organization prior tobeing awarded the contract.
(d) If the coverage period shown on the Contractor’s current certificate of coverage ends during the durationof the project, the Contractor must, prior to the end of the coverage period, file a new certificate of coveragewith the Contracting Local Organization showing that coverage has been extended.
(e) The Contractor shall obtain from each person providing services on a project, and provide to theContracting Local Organization:(1) A certificate of coverage, prior to that person beginning work on the project, so the Contracting Local
Organization will have on file certificates of coverage showing coverage for all persons providing services on
the project, and(2) No later than seven days after receipt by the Contractor, a new certificate of coverage showing
extension of coverage, if the coverage period shown on the current certificate of coverage ends during theduration of the project.
(f) The Contractor shall retain all required certificates of coverage for the duration of the project and thenin accordance with PART II, General Conditions, Article 37, Contractor Records.
(g) The Contractor shall notify the Contracting Local Organization in writing by certified mail or personaldelivery, within 10 days after the Contractor knew or should have known, of any change that materially affects
the provision of coverage of any person providing services on the project.

IFB No. PCCD-22-PCW21Rehab-01

SC-3 of 18(h) The Contractor shall post on each project site a notice [see paragraph (l) of this Article], in the text, form
and manner prescribed by the Texas Department of Insurance, Division of Workers’ Compensation, informing
all persons providing services on the project that they are required to be covered, and stating how a person
may verify coverage and report lack of coverage.
(i) The Contractor shall contractually require each person with whom it contracts to provide services on a
project, to:(1) Provide coverage, based on proper reporting of classification codes and payroll amounts and filingof any coverage agreements, which meets the statutory requirements of Texas Labor Code, Section 401.011(44) for all of its employees providing services on the project, for the duration of the project;(2) Provide to the Contractor, prior to that person beginning work on the project, a certificate of coverage
showing that coverage is being provided for all employees of the person providing services on the project, forthe duration of the project;(3) Provide the Contractor, prior to the end of the coverage period, a new certificate of coverage
showing extension of coverage, if the coverage period shown on the current certificate of coverage ends during
the duration of the project;(4) Obtain from each other person with whom it contracts, and provide to the Contractor:(i)a certificate of coverage, prior to the other person beginning work on the project; and(ii)
a new certificate of coverage showing extension of coverage, prior to the end of the coverage
period, if the coverage period shown on the current certificate of coverage ends during the duration of the
project;(5) Retain all required certificates of coverage on file for the duration of the project and then inaccordance with PART II – General Conditions, Article 37 – Contractor Records;(6) Notify the Contracting Local Organization in writing by certified mail or personal delivery, within 10
days after the person knew or should have known, of any change that materially affects the provision ofcoverage of any person providing services on the project; and(7) Contractually require each person with whom it contracts, to perform as required by paragraphs (1)- (7), with the certificates of coverage to be provided to the person for whom they are providing services.
(j) By signing this contract or providing or causing to be provided a certificate of coverage, the Contractor
is representing to the Contracting Local Organization that all employees of the Contractor who will provide
services on the project will be covered by workers’ compensation coverage for the duration of the project, thatthe coverage will be based on proper reporting of classification codes and payroll amounts, and that all
coverage agreements will be filed with the appropriate insurance carrier or, in the case of a self-insured, with
the TX Department of Insurance, Division of Workers’ Compensation. Providing false or misleading information
may subject the Contractor to administrative penalties, criminal penalties, civil penalties, or other civil actions.
(k) The Contractor’s failure to comply with any of these provisions is a breach of contract by the Contractor
which entitles the Contracting Local Organization to declare the contract void if the Contractor does not remedy
the breach within ten days after receipt of notice of breach from the Contracting Local Organization.
(l) Posting of Notice: “REQUIRED WORKER’S COMPENSATION COVERAGE”“The law requires that each person working on this site or providing services related to this construction
project must be covered by workers’ compensation insurance. This includes persons providing,hauling, or delivering equipment or materials, or providing labor or transportation or other service
related to the project, regardless of the identity of their employer or status as an employee.
Call the Division of Workers’ Compensation at 1-800-252-7031 or access the division’s website at
www.tdi.texas.gov/wc/indexwc.html to receive information on the legal requirement for coverage,
to verify whether your employer has provided the required coverage, or to report an employer’s failure
to provide coverage.”

IFB No. PCCD-22-PCW21Rehab-01

SC-4 of 18

ARTICLE 4 – POST-AWARD INFORMATION
Within five (5) workdays after receipt of Notice of Award, Contractor shall submit to the Contracting Officer thefollowing post-award information:(a) Two (2) fully executed counterparts of the Contract Agreement including all the contract documents.
(b) Performance and payment bonds as specified in Article 13 of these Supplemental Conditions.
(c) Copy of all insurance certificates required in Articles 1, 2, and 3 of these Supplemental Conditions.
(d) List of proposed subcontractors required in PART II, General Conditions, Article 21(a).
(e) Major equipment schedule per PART II, General Conditions, Article 8(a). A firm commitment inwriting from all suppliers of equipment that will be leased shall be provided. Equipment shall be open to
inspection prior to award of the contract or commencement of work to verify soundness and reliability.
(f) Contractor’s proposed workweek (days and clock hours) per PART II, General Conditions, Article
20(a).
(g) Contractor Certification form for Storm Water Pollution Prevention Plan (see PART IV, Appendix A
to Construction Specification 5, Pollution Control).
(h) 3For a nonresident bidder who is a corporation, limited partnership, or limited liability company: acurrent Certificate of Authority from Texas Secretary of State, if not yet provided.
(i) Form CIQ, Conflict of Interest Questionnaire, as required by Article 9 of these Supplemental
Conditions.
Should the bidder to whom the contract is awarded fail or refuse to enter into a proper contract with the
CLO, or fail or refuse to comply with these conditions within the time specified, the bidder forfeits the bid
guarantee, and/or the CLO may pursue any other action allowed by law.
ARTICLE 5 – PERFORMANCE OF WORK BY CONTRACTOR
The Contractor shall perform on the site, and with its own organization, work equivalent to at least twenty (20)percent of the total amount of work to be performed under the Contract. This percentage may be reduced bya supplemental agreement to this contract if, during the performance of the work, the Contractor requests a
reduction and the Contracting Officer determines that the reduction would be to the advantage of theContracting Local Organization.
ARTICLE 6 – COMMENCEMENT, PROSECUTION, AND COMPLETION OF WORK(a) Contractor shall be required to:(1) Commence work under this contract within twenty (20) calendar days from the date of receipt of
written Notice to Proceed [note: performance time commences the day after Notice to Proceed is received];(2) Prosecute the work diligently; and(3) Complete the entire work ready for use not later than five hundred seventy-three (573) calendar
days from the day after Notice to Proceed is received by Contractor.
(b) The time stated for completion shall include final cleanup of the premises.
ARTICLE 7 – VENUEThis contract shall be governed, construed and interpreted under the laws of the State of Texas. This contract
is performable in Caldwell County, Texas. The Contracting Local Organization has domicile in Caldwell County,
Texas, and any legal action must be filed in Caldwell County, Texas.
ARTICLE 8 – WAGES / BENEFITS
8.1 General
Contractor shall pay or cause to be paid, without cost or expense to Contracting Local Organization, all Social
Security, Unemployment and Federal Income Withholding Taxes of all such employees, and all such
employees shall be paid wages and benefits as required by Federal and/or State law (including but not
restricted to unemployment compensation coverage) and per wage rates requirements in Article 8.2 below. In
accordance with Texas Labor Code §61.012, Contractor shall post in conspicuous places in the workplace
notices indicating the paydays.

IFB No. PCCD-22-PCW21Rehab-01

SC-5 of 18

8.2

Laborers and Mechanics – Prevailing Wage Rates(a) This contract requires the Contractor and any of his/her subcontractors at any tier to pay prevailingwage rates as specified in this article and to follow requirements contained in Texas Government Code,
Chapter 2258, Prevailing Wage Rates.
(b) A copy of the Prevailing Wage Rates Determination that must be followed is included in PART VI of thecontract.
(c) A worker employed or working upon the site of the work shall be paid the full amount of wages andbona fide fringe benefits (or cash equivalents thereof) computed at rates not less than those contained in thePrevailing Wage Rates Determination for regular work and for legal holiday and overtime work, regardless ofany contractual relationship which may be alleged to exist between the Contractor and such workers. “Worker”
includes laborers or mechanics.
(d) Workers shall be paid not less than the appropriate wage rate and fringe benefits in the wage
determination for the classification of work actually performed, without regard to skill. Those performing workin more than one classification may be compensated at the rate specified for each classification for the time
actually worked therein; provided that the employer’s payroll records accurately set forth the time spent in eachclassification in which work is performed.
(e) The wage determination shall be posted at all times by the Contractor and subcontractors at the site of
the work in a prominent and accessible place where it can be easily seen by workers.
(f) Whenever the minimum wage rate prescribed in the contract for a class of laborers or mechanics
includes a fringe benefit which is not expressed as an hourly rate, the Contractor shall either pay the benefit asstated in the wage determination or shall pay another bona fide fringe benefit or an hourly cash equivalent
thereof.
(g) The Contractor or subcontractor shall insert in any subcontracts this Article 8, and also a clauserequiring subcontractors to include Article 8 in any lower tier subcontracts. The Prime Contractor shall be
responsible for compliance by any subcontractor or lower tier subcontractor with this article.
(h) Payroll records. A Contractor and subcontractor shall keep a record showing: (i) the name andoccupation of each worker (includes a laborer or mechanic) employed by the Contractor or subcontractor in
the construction of the public work; and (ii) the actual per diem wages paid to each worker. The record shallbe open at all reasonable hours to inspection by the officers and agents of the Contracting Local Organizationand others as required by PART II, General Conditions, Article 37 (Contractor Records).
(i) A Contractor or subcontractor who violates this article shall pay to the Contracting Local Organizationa penalty of $60 for each worker employed for each calendar day or part of the day that the worker is paid lessthan the wage rates stipulated.
ARTICLE 9 – ETHICS / CONFLICTS OF INTEREST(a) Texas Local Government Code Chapter 171 provisions apply to award of this contract.
(b) A bidder and/or Contractor shall not offer or accept gifts or anything of value nor enter into any businessarrangement with any employee, official or agent of the Contracting Local Organization, USDA-Natural
Resources Conservation Service, or Texas State Soil and Water Conservation Board.
(c) Contractor shall submit Form CIQ, Conflict of Interest Questionnaire, to PCCD with its Post-Award
Information (see Article 4 of these General Conditions) and update the submittal if there are any changes duringperformance of the contract.
(d) Section 2252.908, Texas Government Code, as amended, requires that all contracts with private
business entities requiring approval by the PCCD Board of Directors, and/or with the amount of the contract
being in excess of $1,000,000, will require the on-line completion of Form 1295, Certificate of Interested Parties.
Form 1295 is also required for any and all contract amendments, extensions or renewals. The awarded
Contractor will be required to complete and file electronically with the Texas Ethics Commission using the online
filing application. If you have any questions about compliance, please consult your own legal counsel.
Compliance is the individual responsibility of the Contractor. Please visit State of Texas Ethics Commission
website for more information:• https://www.ethics.state.tx.us/filinginfo/1295/

IFB No. PCCD-22-PCW21Rehab-01

SC-6 of 18

ARTICLE 10 – PROTESTS(a) Any actual or prospective bidder, offeror, proposer, or contractor who is aggrieved in connection withthe solicitation, evaluation, or award of a contract may formally protest to the Contracting Officer. Suchprotests must be in writing and received by the Contracting Officer within ten working days after suchaggrieved person knows, or should have known, of the occurrence of the action which is protested. Formal
protests must conform to the requirements of this article and subsection (c) of this article, and shall be
resolved in accordance with the procedure set forth in subsections (d) and (e) of this article. Copies of theprotest must be mailed or delivered by the protesting person to the project manager, if any, and otherinterested persons. For the purposes of this section, "interested persons" means all vendors who havesubmitted bids or proposals for the contract involved.
(b) In the event of a timely protest or appeal under this section, the Contracting Local Organization shallnot proceed further with the solicitation or with the award of the contract unless the Contracting Officer
makes a written determination that the award of a contract without delay is necessary to protect substantial
interests of the state.
(c) A formal protest must be sworn and notarized and contain:(1) a specific identification of the statutory or regulatory provision(s) that the action complained ofis alleged to have violated;(2) a specific description of each act alleged to have violated the statutory or regulatory provision(s)identified in paragraph (1) of this subsection;(3) a precise statement of the relevant facts;(4) an identification of the issue or issues to be resolved;(5) argument and authorities in support of the protest; and(6) a statement that copies of the protest have been mailed or delivered to other identifiableinterested persons.
(d) The Contracting Officer may settle and resolve the dispute concerning the solicitation or award of acontract by mutual agreement with the protesting person. The Contracting Officer may solicit written
responses to the protest from other interested persons.
(e) If the protest is not resolved by mutual agreement, the Contracting Officer will issue a written
determination on the protest.
(1) If the Contracting Officer determines that no violation of rules or statutes has occurred, he or
she shall inform the protesting person and other interested persons by letter which sets forth the reasonsfor the determination.
(2) If the Contracting Officer determines that a violation of the rules or statutes has occurred in acase where a contract has not been awarded, he or she shall inform the protesting person and otherinterested persons by letter that sets forth the reasons for the determination and the appropriate remedialaction.
(3) If the Contracting Officer determines that a violation of the rules or statutes has occurred in acase where a contract has been awarded, he or she shall inform the protesting person and other interested
persons by letter which sets forth the reasons for the determination, and the appropriate remedial action,
which may include ordering the contract void.
(f) After the Contracting Officer’s determination has been made, the aggrieved person or interested
persons may request reconsideration of the Contracting Officer's determination to be made by the Plum
Creek Conservation District Board President or his/her designee. Such request must be in writing and must
be received in the Board office no later than ten working days after the date of the Contracting Officer's
determination, which shall be calculated from the date the Contracting Officer's letter is hand-delivered,delivered by a nationally recognized courier service, or mailed by certified or registered mail. The request
shall be limited to review of the Contracting Officer's determination. Copies of the request must be mailed
or delivered by the aggrieved person to other interested persons. The request must contain an affidavit thatsuch copies have been provided.
(g) The Plum Creek Conservation District Board President shall issue a final determination on the protest
within 15 days after receipt of the aggrieved person's request for reconsideration.
(h) A decision issued in writing by the Plum Creek Conservation District Board President in response toa request for reconsideration shall be the final administrative action of the Board.

IFB No. PCCD-22-PCW21Rehab-01

SC-7 of 18(i) Unless good cause for delay is shown or the Contracting Officer or Plum Creek Conservation District
Board President determines that a protest or appeal raises issues significant to procurement practices orprocedures, a protest or appeal that is not filed timely will not be considered.
(j) In the event of a protest, all documents collected by the Plum Creek Conservation District Board aspart of a solicitation, evaluation, and/or award of a contract shall be retained by the Board for a period offour years to include the current fiscal year and three additional fiscal years.
ARTICLE 11 – DISPUTES / ALTERNATIVE DISPUTE RESOLUTION (ADR)[This article supplements PART II, General Conditions, Article 6 – Claims]
11.1 Claims(a) The Contracting Local Organization’s policy is to try to resolve all contractual issues in controversy bymutual agreement at the Contracting Officer’s level. Reasonable efforts should be made to resolve
controversies prior to the submission of a claim. Use of ADR procedures to the maximum extent practicable isencouraged.
(b) Initiation of a claim. (1) Contractor claims shall be submitted, in writing, to the Contracting Officer for adecision no later than the 180th day after accrual of a claim. The claim must state with particularity the natureof the breach, the amount the Contractor seeks as damages, and the legal theory of recovery. The Contracting
Officer shall document the contract file with evidence of the date of receipt of any submission from theContractor deemed to be a claim by the Contracting Officer. The Contracting Officer must assert, in a writingdelivered to the Contractor, any counterclaim not later than the 90th day after the date of receipt of Contractor’s
written claim(2) The Contracting Local Organization shall issue a written decision on any Contracting Local
Organization claim initiated against a Contractor no later than the 180th day after accrual of the claim. This time
period shall not apply to a Contracting Local Organization claim based on a Contractor claim involving fraud.
(c) Contractor certification. Contractor shall provide the certification specified below when submitting any
claim exceeding $100,000, or regardless of the amount claimed when using ADR procedures. The certification
requirement does not apply to issues in controversy that have not been submitted as all or part of a claim. The
certification may be executed by any person duly authorized to bind the Contractor with respect to the claim.
The certification shall state as follows:“I certify that the claim is made in good faith; that the supporting data are accurate andcomplete to the best of my knowledge and belief; that the amount requested accuratelyreflects the contract adjustment for which the Contractor believes the Contracting Local
Organization is liable; and that I am duly authorized to certify the claim on behalf of theContractor.”(d) The Contracting Local Organization shall pay interest on a Contractor’s claim on the amount found due
and unpaid from the date that the Contracting Officer receives the claim (certified if required by Article 11.1(c)above); or payment otherwise would be due, if that date is later, until the date of payment. If a claim has adefective certification, interest shall be paid from the date that the Contracting Local Organization receives aproper certification. Amount of interest due will be per Texas and local law and regulation.
11.2 Alternative Dispute Resolution (ADR)(a) The objective of using ADR procedures is to increase the opportunity for relatively inexpensive andexpeditious resolution of issues in controversy. Essential elements of ADR include:(1) Existence of an issue in controversy,(2) A voluntary election by both parties to participate in the ADR process,(3) An agreement on alternative procedures and terms to be used in lieu of formal litigation,(4) Participation in the process by officials of both parties who have the authority to resolve the issue incontroversy, and(5) Certification by the Contractor in accordance with Article 11.1(c) when using ADR procedures toresolve all or part of a claim.
(b) If either party rejects a request for ADR from the other party, the rejecting party shall inform the otherparty in writing of the specific reasons for rejecting the request, including but not limited to why ADR procedures
are inappropriate for the resolution of the dispute.
(c) ADR procedures may be used at any time that the Contracting Officer has authority to resolve the issue
in controversy. If a claim has been submitted, ADR procedures may be applied to all or a portion of the claim.

IFB No. PCCD-22-PCW21Rehab-01

SC-8 of 18

When ADR procedures are used subsequent to the issuance of a Contracting Officer’s final decision, their use
does not constitute a reconsideration of the final decision.
(d) When appropriate, a neutral person may be used to facilitate resolution of the issue in controversy using
the procedures chosen by the parties.
(e) The rights of Contracting Local Organization and Contractor to exercise such rights or remedies as
either party may otherwise have under the contract or by laws or regulations in respect of any claims, disputes,
and other issues in controversy are not affected by action taken under this Article.
(f) ADR procedures must be consistent with Chapter 154, Texas Civil Practice and Remedies Code, andChapter 2009, Texas Government Code, Alternative Dispute Resolution for Use by Governmental Bodies.
11.3 Definitions(a) Accrual of a claim occurs on the date when all events, which fix the alleged liability of either theContracting Local Organization or the Contractor and permit assertion of the claim, were known or should havebeen known. For liability to be fixed, some injury must have occurred. However, monetary damages need nothave been incurred.
(b) Alternative dispute resolution (ADR) means any procedure or combination of procedures voluntarily
used to resolve issues in controversy without the need to resort to litigation. These procedures may include,
but are not limited to, assisted settlement negotiations, conciliation, facilitation, mediation, fact-finding, minitrials, and arbitration.
(c) Claim as used in this Article means a written demand or written assertion by one of the contracting
parties seeking as a matter of right, the payment of money in a sum certain, the adjustment or interpretation ofcontract terms, or other relief arising under or relating to the contract. A claim arising under a contract, unlikea claim relating to that contract, is a claim that can be resolved under a contract clause that provides for therelief sought by the claimant. However, a written demand or written assertion by the contractor seeking thepayment of money exceeding $100,000 is not a claim under this Article until certified as required by Article
11.1(c) above. A voucher, invoice, or other routine request for payment that is not in dispute when submitted
is not a claim. The submission may be converted to a claim, by written notice to the Contracting Officer withintime limits in section 11.1(b) of this Article, if it is disputed either as to liability or amount or is not acted upon ina reasonable time.
(d) Defective certification as used in this Article means a certificate which alters or otherwise deviates fromthe language in this Article or which is not executed by a person duly authorized to bind the Contractor withrespect to the claim. Failure to certify shall not be deemed to be a defective certification.
(e) Issue in controversy means a material disagreement between the Contracting Local Organization and
the Contractor which:(1) May result in a claim, or(2) Is all or part of an existing claim.
(f) Misrepresentation of fact as used in this Article means a false statement of substantive fact, or any
conduct which leads to the belief of a substantive fact material to proper understanding of the matter in hand,made with intent to deceive or mislead.
(g) Neutral person as used in this Article means an impartial third party, who serves as a mediator, factfinder, or arbitrator, or otherwise functions to assist the parties to resolve the issues in controversy. A neutral
person may be a permanent or temporary officer or employee of the Contracting Local Organization, or theFederal government, or any other individual who is acceptable to the parties. A neutral person shall have no
official, financial, or personal conflict of interest with respect to the issues in controversy, unless such interest
is fully disclosed in writing to all parties and all parties agree that the neutral person may serve. An “impartial
third party” must possess the qualifications required under Section 154.052, Texas Civil Practice and Remedies
Code.
ARTICLE 12 – INDEMNIFICATION CLAUSEThe Contractor shall defend, indemnify, and hold harmless the Contracting Local Organization, all of its officers,
agents and employees from and against all claims, actions, suits, demands, proceedings, costs, damages, andliabilities, arising out of, connected with, or resulting from any acts or omissions of Contractor or any agent,employee, subcontractor, or supplier of Contractor in the execution of performance of this contract.

IFB No. PCCD-22-PCW21Rehab-01

SC-9 of 18

ARTICLE 13 – PERFORMANCE AND PAYMENT BONDS
13.1 General(a) This contract requires performance and payment bonds as outlined in 13.2 below. Such bonds are
due within five (5) workdays after receipt of Notice of Award (see Article 4 of these Supplemental
Conditions). The Contracting Local Organization will attach to the Notice of Award the bond forms to beused.
(b) Bonds shall be made payable to: Plum Creek Conservation District.
(c) Bonds are subject to requirements stated in this Article and requirements of Texas Government
Code, Chapter 2253, Public Work Performance and Payment Bonds, and must be executed by a corporate
surety in accordance with Texas Insurance Code, Chapter 3503 (Surety Bonds and Related Instruments),
Subchapter A.
13.2 Performance and Payment Bonds—Construction(a) Definitions. As used in this clause-- "Contract price" means the award price of the contract.
“Government” means the Contracting Local Organization.
(b) The successful offeror shall be required to furnish performance and payment bonds to theContracting Officer as follows:(1) Performance Bond:(i) The penal amount of performance bond shall be 100 percent of the original contract price.
(ii) The Government may require additional performance bond protection when the contract priceis increased. The increase in protection shall generally equal 100 percent of the increase in contract price.
(iii) The Government may secure additional protection by directing the Contractor to increase thepenal amount of the existing bond or to obtain an additional bond.
(2) Payment Bond:(i) The penal amount of payment bond shall be 100 percent of the original contract price.
(ii) The Government may require additional performance bond protection when the contract priceis increased. The increase in protection shall generally equal 100 percent of the increase in contract price.
(iii) The Government may secure additional protection by directing the Contractor to increase thepenal sum of the existing bond or to obtain an additional bond.
(c) The Contractor shall furnish all executed bonds, including any necessary reinsurance agreements,
to the Contracting Officer, within the time period specified in 13.1 above.
(d) A bond may be executed only by a corporate surety company that is authorized and admitted towrite surety bonds in the State of Texas.
(e) For both the Performance bond and Payment bond, the surety must (i) hold a certificate of authority
from the United States Secretary of the Treasury to qualify as a surety on obligations permitted or required
under federal law; or (ii) have obtained reinsurance for any liability in excess of $1,000,000 from a reinsurerthat is an authorized reinsurer in the State of Texas or is a holder of a certificate of authority from the UnitedStates Secretary of the Treasury to qualify as a surety or reinsurer on obligations permitted or required
under federal law. U.S. Treasury Department Circular 570 is published in the Federal Register and lists
Treasury approved surety companies and their underwriting limitations.
(f) All bonds signed by an agent must be accompanied by a certified copy of such agent’s authority to act.
(g) A bond required under this Article must clearly and prominently display on the bond or on an attachment
to the bond: (1) the name, mailing address, physical address, and telephone number, including the area code,of the surety company to which any notice of claim should be sent; or (2) the toll-free telephone number
maintained by the Texas Department of Insurance under Subchapter B, Chapter 521, Insurance Code, and astatement that the address of the surety company to which any notice of claim should be sent may be obtained
from the Texas Department of Insurance by calling the toll-free telephone number.
ARTICLE 14 – EQUAL OPPORTUNITY (FEDERALLY ASSISTED CONSTRUCTION)
During the performance of this contract, the Contractor agrees as follows:(a) The Contractor will not discriminate against any employee or applicant for employment because of race,color, religion, sex, sexual orientation, gender identity, or national origin. The Contractor will take affirmative
action to ensure that applicants are employed, and that employees are treated during employment without
regard to their race, color, religion, sex, sexual orientation, gender identity, or national origin. Such action shall
include, but not be limited to the following: Employment upgrading, demotion or transfer, recruitment or
recruitment advertising; layoff or termination; rates of pay or other forms of compensation; and selection for

IFB No. PCCD-22-PCW21Rehab-01

SC-10 of 18

training, including apprenticeship. The Contractor agrees to post in conspicuous places, available toemployees and applicants for employment, notices to be provided setting forth the provisions of this Equal
Opportunity (Federally Assisted Construction) clause.
(b) The Contractor will, in all solicitations or advertisements for employees placed by or on behalf of theContractor, state that all qualified applicants will receive considerations for employment without regard to race,color, religion, sex, sexual orientation, gender identity, or national origin.
(c) The Contractor will send to each labor union or representative of workers, with which he/she has acollective bargaining agreement or other contract or understanding, a notice to be provided advising the saidlabor union or workers’ representatives of the Contractor’s commitments under this section, and shall post
copies of the notice in conspicuous places available to employees and applicants for employment.
(d) The Contractor will comply with all provisions of Executive Order No. 11246 of September 24, 1965,
and of the rules, regulations, and relevant orders of the Secretary of Labor.
(e) The Contractor will furnish all information and reports required by Executive Order No. 11246 of
September 24, 1965, and by the rules, regulations, and orders of the Secretary of Labor, or pursuant thereto,
and will permit access to his/her books, records, and accounts by the administering agency and the Secretaryof Labor for purposes of investigation to ascertain compliance with such rules, regulations, and orders.
(f) In the event of the Contractor’s noncompliance with the nondiscrimination clause of this contract or withany of the said rules, regulations, or orders, this contract may be canceled, terminated, or suspended, in whole
or in part, and the Contractor may be declared ineligible for further Government contracts or federally assisted
construction contracts in accordance with procedures authorized in Executive Order No. 11246 of September
24, 1965, and such other sanctions may be imposed and remedies invoked as provided in Executive OrderNo. 11246 of September 24, 1965, or by rule, regulations, or order of the Secretary of Labor, or as provided bylaw.
(g) The Contractor will include this Equal Opportunity (Federally Assisted Construction) clause in every
subcontract or purchase order, unless exempted by the rules, regulations, or orders of the Secretary of Labor
issued pursuant to section 204 of Executive Order No. 11246 of September 24, 1965, so that such provisions
will be binding upon each subcontractor or vendor. The Contractor will take such action with respect to any
subcontract or purchase order as the administering agency may direct as a means of enforcing such provisions,
including sanctions for noncompliance. Provided, however, in the event a Contractor becomes involved in, oris threatened with, litigation with a subcontractor or vendor as a result of such direction by the administering
agency the Contractor may request the United States to enter into such litigation to protect the interests of theUnited States.
ARTICLE 15 – NOTICE TO PROSPECTIVE FEDERALLY ASSISTED CONSTRUCTION CONTRACTORS(a) A Certification of Nonsegregated Facilities (included in PART I – General Provisions, Subpart C, Bid
Forms, Exhibit E, Section F) must be submitted prior to the award of a federally assisted construction contract
which is not exempt from the provisions of the Equal Opportunity clause (Article 14 of these Supplemental
Conditions).
(b) Contractors receiving federally assisted construction contract awards not exempt from the provisionsof the Equal Opportunity clause will be required to forward the following notice to prospective subcontractors
for supplies and construction contracts where the subcontracts and are not exempt from the provisions of theEqual Opportunity clause (Article 14 of these Supplemental Conditions).
Notice to Prospective Subcontractors of Requirement for
Certification of Nonsegregated Facilities(a) A Certification of Nonsegregated Facilities shown below must be submitted prior to theaward of a subcontract which is not exempt from the provisions of the Equal Opportunity
clause.
(b) Contractors receiving subcontract awards not exempt from the provisions of the Equal
Opportunity clause will be required to forward this notice to prospective subcontractors for
supplies and construction contracts where the subcontracts are not exempt from theprovisions of the Equal Opportunity clause.

IFB No. PCCD-22-PCW21Rehab-01

SC-11 of 18

Certification of Nonsegregated Facilities[Applicable to federally assisted construction contracts and related subcontracts not exempt
from the Equal Opportunity clause (Article 14 of PART III - Supplemental Conditions)]
The federally assisted construction Contractor certifies they do not maintain or provide for theiremployees any segregated facilities at any of their establishments, and that they do not permit
their employees to perform services at any location, under their control, where segregatedfacilities are maintained. The federally assisted construction Contractor certifies further thatthey will not maintain or provide for their employees any segregated facilities at any of theirestablishments, and that, they will not permit their employees to perform services at any
location, under their control, where segregated facilities are maintained. The federally
assisted construction Contractor agrees that a breach of this section is a violation of the Equal
Opportunity clause in this contract. As used in this caption, the term “segregated facilities”
means any waiting rooms, work areas, restrooms, washrooms, restaurants and other eatingareas, time clocks, locker rooms and other storage or dressing areas, parking lots, drinking
fountains, recreation or entertainment areas, transportation, and housing facilities provided for
employees which are segregated by explicit directive or are in fact segregated on the basis ofrace, color, religion, sex, sexual orientation, gender identity, or national origin or because of
habit, local custom, or otherwise. The federally assisted construction Contractor agrees that(except where they have obtained identical certifications from proposed subcontractors for
specific time periods) they will obtain identical certifications from proposed subcontractors
prior to the award of subcontracts which are not exempt from the provisions of the Equal
Opportunity clause, and that they will retain such certifications in their files.
NOTE: Penalty for making false statements in offers is prescribed in 18 U.S.C. 1001.
ARTICLE 16 – STANDARD FEDERAL EQUAL EMPLOYMENT OPPORTUNITY CONSTRUCTIONCONTRACT SPECIFICATIONS (EXECUTIVE ORDER 11246)(1) As used in these specifications:(a) “Covered area” means the geographical area described in the solicitation from which this contract
resulted.
(b) “Director” means Director, Office of Federal Contract Act Compliance Program, United States
Department of Labor, or any person to whom the Director delegates authority.
(c) “Employer identification number” means the Federal Social Security number used on the Employer’s
Quarterly Federal Tax Return, U.S. Treasury Department Form 94 1.
(d) “Minority” includes: (i) Black (all persons having origins in any of the Black African racial groups not of
Hispanic origin); (ii) Hispanic (all persons of Mexican, Puerto Rican, Cuban Central or South Americanor other Spanish Culture or origin, regardless of race); (iii) Asian and Pacific Islander (all persons
having origins in any of the original peoples of the Far East, Southeast Asia, the Indian Subcontinent,or the Pacific Islands); and (iv) American Indian or Alaskan Native (all persons having origins in anyof the original peoples of North America and maintaining identifiable tribal affiliations throughmembership and participation or community identification).
(2) Whenever the Contractor, or any Subcontractor at any tier, subcontracts a portion of the work involving
any construction trade, it shall physically include in each subcontract, in excess of $10,000, the provisions ofthese specifications and the Notice which contains the applicable goals for minority and female participation
which is set forth in the solicitations from which the contract resulted.
(3) If the Contractor is participating (pursuant to 41 CFR 60-4.5) in a Hometown Plan approved by the U.S.
Department of Labor in the covered area either individually or through an association, its affirmative action
obligations on all work in the Plan area (including goals and timetables) shall be in accordance with that Planfor those trades which have unions participating in the Plan. Contractors must be able to demonstrate their
participation in and compliance with the provisions of any such Hometown Plan. Each Contractor or
Subcontractor participating in an approved Plan is individually required to comply with its obligations under the
EEO Clause, and to make a good faith effort to achieve each goal under the Plan in each trade in which it has
employees. The overall good faith performance by other Contractors or Subcontractors toward a goal in an
approved Plan does not excuse any covered Contractors or Subcontractors failure to take good faith efforts toachieve the Plan goals and timetables.

IFB No. PCCD-22-PCW21Rehab-01

SC-12 of 18(4) The Contractor shall implement the specific affirmative action standards provided in Paragraphs (7)(a)through (7)(p) of these specifications. The goals set forth in the solicitation from which this contract resulted
are expressed as percentages of the total hours of employment and training of minority and female utilizationthat the Contractor should reasonably be able to achieve in each construction trade in which it has employees
in the covered area. Covered construction contractors performing construction work in geographical areas
where they do not have a Federal or Federally assisted construction contract shall apply the minority andfemale goals established for the geographic area where the work is being performed. Goals are publishedperiodically in the Federal Register in notice form and such notices may be obtained from any Office of Federal
Contract Compliance Programs or from Federal procurement Contracting Officers. The Contractor is expected
to make substantially uniform progress in meeting its goals in each craft during the period specified.
Notice for IFB No. PCCD-22-PCW21Rehab-01(a) Covered Area is Caldwell County, Texas.
(b) Goal for Female Participation: 6.9 percent (all trades)(c)

Goal for Minority Participation: 24.2 percent (all trades)(d) Goals are expressed in percentage terms for the Contractor’s aggregate workforce in each trade on
all construction work in the covered area.
(5) Neither the provisions of any collective bargaining agreement, nor the failure by a union with whom theContractor has a collective bargaining agreement, to refer either minorities or women shall excuse theContractor’s obligations under the specifications, Executive Order 11246, or the regulations promulgatedpursuant thereto.
(6) In order for the non-working training hours of apprentices and trainees to be counted in meeting the goals,
such apprentices and trainees must be employed by the Contractor during the training period, and theContractor must have made a commitment to employ the apprentices and trainees at the completion of theirtraining, subject to the availability of employment opportunities. Trainees must be trained pursuant to training
programs approved by the U.S. Department of Labor.
(7) The Contractor shall take specific affirmative actions to ensure equal employment opportunity. The
evaluation of the Contractor’s compliance with these specifications shall be based upon its effort to achieve
maximum results from its actions. The Contractor shall document these efforts fully, and shall implement
affirmative action steps at least as extensive as the following:(a) Ensure and maintain a working environment free of harassment, intimidation and coercion at all sites,
and in all facilities at which the Contractor’s employees are assigned to work. The Contractor, where
possible, will assign two or more women to each construction project. The Contractor shall specificallyensure that all foremen, superintendents, and other on-site supervisory personnel are aware of andcarry out the Contractor’s obligation to maintain such a working environment, with specific attention tominority or female individuals working at such sites or in such facilities.
(b) Establish and maintain a current list of minority and female recruitment sources, provide written
notification to minority and female recruitment sources and to community organizations when theContractor or its unions have employment opportunities available, and maintain a record of theorganizations’ responses.
(c) Maintain a current file of the names, addresses and telephone numbers of each minority and female
off-the-street applicant and minority or female referral from a union, a recruitment source or community
organization and of what action was taken with respect to each such individual. If such individual wassent to the union hiring hall for referral and was not referred back to the Contractor by the union, or, if
referred, not employed by the Contractor, this shall be documented in the file with the reason therefor,along with whatever additional actions the Contractor may have taken.
(d) Provide immediate written notification to the Director when the union or unions with which theContractor has a collective bargaining agreement has not referred to the Contractor a minority person
or woman sent by the Contractor; or, when the Contractor has other information that the union referral
process had impeded the Contractor’s efforts to meet its obligations.
(e) Develop on-the-job training opportunities and/or participate in training programs for the area which
expressly include minorities and women, including upgrading programs and apprenticeship andtrainee programs relevant to the Contractor’s employment needs, especially those programs fundedIFB No. PCCD-22-PCW21Rehab-01

SC-13 of 18

or approved by the Department of Labor. The Contractor shall provide notice of these programs to
the sources compiled under paragraph (7)(b) above.
(f) Disseminate the Contractor’s EEO policy by providing notice of the policy to unions and training
programs and requesting their cooperation in assisting the Contractor in meeting its EEO obligations;by including it in any policy manual and collective bargaining agreement; by publicizing it in thecompany newspaper, annual report, etc.; by specific review of the policy with all management
personnel and with all minority and female employees at least once a year; and by posting thecompany EEO policy on bulletin boards accessible to all employees at each location whereconstruction work is performed.
(g) Review, at least annually, the company’s EEO policy and affirmative action obligations under these
specifications with all employees having any responsibility for hiring, assignment, layoff, termination,or other employment decisions, including specific review of these items with on-site supervisorypersonnel such as Superintendents, General Foremen, etc., prior to the initiation of construction workat any job site. A written record shall be made and maintained identifying the time and place of thesemeetings, persons attending, subject matter discussed, and disposition of the subject matter.
(h) Disseminate the Contractor’s EEO policy externally by including it in any advertising in the news media,
specifically including minority and female news media, and providing written notification to anddiscussing the Contractor’s EEO policy with other contractors and subcontractors with whom theContractor does or anticipates doing business.
(i) Direct its recruitment efforts, both oral and written, to minority, female, and community organizations,to schools with minority and female students and to minority and female recruitment and training
organizations serving the Contractor’s recruitment area and employment needs. Not later than one
month prior to the date for the acceptance of the applications for apprenticeship or other training by
any recruitment sources the Contractor shall send written notification, to organizations such as theabove, describing the openings, screening procedure, and tests to be used in the selection process.
(j) Encourage present minority and female employees to recruit other minority persons and women and,
where reasonable, provide after school, summer and vacation employment to minority and female
youth both on the site and in other areas of a Contractor’s workforce.
(k) Validate all tests and other selection requirements where there is an obligation to do so under 41 CFRPart 60-3.
(l) Conduct, at least annually, an inventory and evaluation at least of all minority and female personnel
for promotional opportunities and encourage these employees to seek or to prepare for, throughappropriate training, etc., such opportunities.
(m) Ensure that seniority practices, job classifications, work assignments, and other personnel practices
do not have a discriminatory effect by continually monitoring all personnel and employment related
activities to ensure that the EEO policy and the Contractor’s obligations under these specifications arebeing carried out.
(n) Ensure that all facilities and company activities are nonsegregated except that separate or single-user
toilet and necessary changing facilities shall be provided to assure privacy between the sexes.
(o) Document and maintain a record of all solicitations of offers for subcontracts from minority and female
construction contractors and suppliers, including circulation of solicitations to minority and female
contractor associations and other business associations.
(p) Conduct a review, at least annually, of all supervisors’ adherence to and performance under theContractor’s EEO policies and affirmative action obligations.
(8) Contractors are encouraged to participate in voluntary associations which assist in fulfilling one or more of
the affirmative action obligations [paragraphs (7)(a) through (7)(p)]. The efforts of a contractor association, joint
contractor-union, contractor-community, or other similar group of which the Contractor is a member andparticipant, may be asserted as fulfilling any one or more of its obligations under paragraphs (7)(a) through(7)(p) of the specifications, provided that the Contractor actively participates in the group, makes every effort
to assure that the group has a positive impact on the employment of minorities and women in the industry,
ensures that the concrete benefits of the program are reflected in the Contractor’s minority and female
workforce participation, makes a good faith effort to meet its individual goals and timetables, and can provide
access to documentation which demonstrates the effectiveness of actions taken on behalf of the Contractor.
The obligation to comply, however, is the Contractor’s and failure of such a group to fulfill an obligation shallnot be a defense for the Contractor’s noncompliance.

IFB No. PCCD-22-PCW21Rehab-01

SC-14 of 18(9) A single goal for minorities and a separate single goal for women have been established. The Contractor,
however, is required to provide equal employment opportunity and to take affirmative action for all minority
groups, both male and female, and all women, both minority and nonminority. Consequently, the Contractor
may be in violation of the Executive Order if a particular group is employed in a substantially disparate manner(for example, even though the Contractor has achieved its goals for women generally, the Contractor may bein violation of the Executive Order if a specific minority group of women is underutilized).
(10) The Contractor shall not use the goals and timetables or affirmative action standards to discriminate against
any person because of race, color, religion, sex, sexual orientation, gender identity, or national origin.
(11) The Contractor shall not enter into any subcontract with any person or firm debarred from Government
contracts pursuant to Executive Order 11246.
(12) The Contractor shall carry out such sanctions and penalties for violation of these specifications and of theEqual Opportunity Clause, including suspension, termination, and cancellation of existing subcontracts as may
be imposed or ordered pursuant to Executive Order 11246, as amended, and its implementing regulations, by
the Office of Federal Contract Compliance Programs. Any Contractor who fails to carry out such sanctions andpenalties shall be in violation of these specifications and Executive Order 11246, as amended.
(13) The Contractor, in fulfilling its obligations under these specifications, shall implement specific affirmative
action steps, at least as extensive as those standards prescribed in paragraph (7) of these specifications, so
as to achieve maximum results from its efforts to ensure equal employment opportunity. If the Contractor fails
to comply with the requirements of the Executive Order, the implementing regulations, or these specifications,the Director shall proceed in accordance with 41 CFR 60-4.8.
(14) The Contractor shall designate a responsible official to monitor all employment related activity to ensurethat the company EEO policy is being carried out, to submit reports relating to the provisions hereof as may berequired by the Government, and to keep records. Records shall at least include for each employee the name,address, telephone numbers, construction trade, union affiliation if any, employee identification number whenassigned, social security number, race, sex, status (e.g., mechanic, apprentice, trainee, helper, or laborer),
dates of changes in status, hours worked per week in the indicated trade, rate of pay, and locations at which
the work was performed. Records shall be maintained in an easily understandable and retrievable form;
however, to the degree that existing records satisfy this requirement, Contractors shall not be required tomaintain separate records.
(15) Nothing herein provided shall be construed as a limitation upon the application of other laws which establish
different standards of compliance or upon the application of requirements for the hiring of local or other area
residents (e.g., those under the Public Works Employment Act of 1977 and the Community Development Block
Grant Program).
ARTICLE 17 – CERTIFICATION REGARDING DEBARMENT, SUSPENSION, INELIGIBILITY AND
VOLUNTARY EXCLUSION—LOWER TIER COVERED TRANSACTIONS[Applicable to offers of $25,000 or more]
Per Contractor’s certification given in PART I, Subpart C, Exhibit E, Section G, this Article shall be included,
without modification, in all lower tier covered transactions (subcontracts) of $25,000 and more and in all
solicitations for lower tier covered transactions.
(a) Instructions for Certification(1) By signing and submitting this proposal, the prospective lower tier participant is providing thecertification set out below.
(2) The certification in this clause is a material representation of fact upon which reliance was placedwhen this transaction was entered into. If it is later determined that the prospective lower tier participant
knowingly rendered an erroneous certification, in addition to other remedies available to the Federal
Government, the department or agency with which this transaction originated may pursue available remedies,including suspension and/or debarment.
(3) The prospective lower tier participant shall provide immediate written notice to the person to which
this proposal is submitted if at any time the prospective lower tier participant learns that its certification waserroneous when submitted or had become erroneous by reason of changed circumstances.

IFB No. PCCD-22-PCW21Rehab-01

SC-15 of 18(4) The terms herein are as defined in 2 CFR Part 180, OMB Guidelines to Agencies on
Governmentwide Debarment and Suspension (Nonprocurement).
(5) The prospective lower tier participant agrees by submitting this proposal that, should the proposedcovered transaction be entered into, it shall not knowingly enter into any lower tier covered transaction with aperson who is proposed for debarment under 48 Code of Federal Regulations (CFR) part 9, subpart 9.4,
debarred, suspended, declared ineligible, or voluntarily excluded from participation in this covered transaction,
unless authorized by the department or agency with which this transaction originated.
(6) The prospective lower tier participant further agrees by submitting this proposal that it will include
this clause titled “Certification Regarding Debarment, Suspension, Ineligibility and Voluntary Exclusion—Lower
Tier Covered Transactions,” without modification, in all lower tier covered transactions of $25,000 or more andin all solicitations for lower tier covered transactions.
(7) A participant in a covered transaction may rely upon a certification of a prospective participant in alower tier covered transaction that it is not proposed for debarment under 48 CFR part 9, subpart 9.4, debarred,suspended, ineligible, or voluntarily excluded from covered transactions, unless it knows that the certification
is erroneous. A participant may decide the method and frequency by which it determines the eligibility of its
principals. Each participant may, but is not required to, check the Office of Federal Compliance Programs
electronic roster at the System for Award Management (SAM) website: www.sam.gov.
(8) Nothing contained in the foregoing shall be construed to require establishment of a system ofrecords in order to render in good faith the certification required by this clause. The knowledge and informationof a participant is not required to exceed that which is normally possessed by a prudent person in the ordinary
course of business dealings.
(9) Except for transactions authorized under paragraph (5) of these instructions, if a participant in acovered transaction knowingly enters into a lower tier covered transaction with a person who is proposed for
debarment under 48 CFR part 9, subpart 9.4, suspended, debarred, ineligible, or voluntarily excluded fromparticipation in this transaction, in addition to other remedies available to the Federal Government, thedepartment or agency with which this transaction originated may pursue available remedies, including
suspension and/or debarment.
Certification Regarding Debarment, Suspension, Ineligibility andVoluntary Exclusion – Lower Tier Covered Transactions(1) The prospective lower tier participant certifies, by submission of this proposal, thatneither it nor its principals is presently debarred, suspended, proposed for debarment,
declared ineligible, or voluntarily excluded from participation in this transaction by any Federal
department or agency.
(2) Where the prospective lower tier participant is unable to certify to any of thestatements in this certification, such prospective participant shall attach an explanation to thisoffer.
NOTE: Penalty for making false statements in offers is prescribed in 18 U.S.C. 1001.

ARTICLE 17A – TEXAS CERTIFICATION REGARDING DEBARMENT, SUSPENSION, INELIGIBILITY
AND VOLUNTARY EXCLUSION—LOWER TIER COVERED TRANSACTIONSContractor shall not subcontract to perform work under this contract with any firm that is presently on the Stateof Texas debarred vendor list maintained by the Texas Comptroller of Public Accounts.

ARTICLE 18 – CERTIFICATION REGARDING LOBBYING CERTIFICATION FOR CONTRACTS, GRANTS,
LOANS, AND COOPERATIVE AGREEMENTS[Applicable to all subcontracts to a prime contract of $100,000 or more at any tier under a Federal grant.]
Per Contractor’s certification given in PART I, Subpart C, Exhibit H, Section G, the language of the following
certification shall be included in the award documents for all subcontracts at all tiers and that all subcontractors
shall certify and disclose accordingly:

IFB No. PCCD-22-PCW21Rehab-01

SC-16 of 18

The undersigned certifies, to the best of his or her knowledge and belief, that:(1) No Federal appropriated funds have been paid or will be paid, by or on behalf of theundersigned, to any person for influencing or attempting to influence an officer or employee ofan agency, a Member of Congress, an officer or employee of Congress, or an employee of a
Member of Congress in connection with the awarding of any Federal contract, the making of
any Federal grant, the making of any Federal loan, the entering into of any cooperative
agreement, and the extension, continuation, renewal, amendment, or modification of any
Federal contract, grant, loan, or cooperative agreement.
(2) If any funds other than Federal appropriated funds have been paid or will be paid toany person for influencing or attempting to influence an officer or employee of any agency, aMember of Congress, an officer or employee of Congress, or an employee of a Member ofCongress in connection with this Federal contract, grant, loan, or cooperative agreement, theundersigned shall complete and submit Standard Form-LLL, “Disclosure Form to Report
Lobbying,” in accordance with its instructions.
(3) The undersigned shall require that the language of this certification be included in
the award documents for all subawards at all tiers (including subcontracts, subgrants, andcontracts under grants, loans, and cooperative agreements) and that all subrecipients shallcertify and disclose accordingly.
This certification is a material representation of fact upon which reliance was placed when thistransaction was made or entered into. Submission of this certification is a prerequisite formaking or entering into this transaction imposed by section 1352, Title 31, U.S. Code. Any
person who fails to file the required certification shall be subject to a civil penalty of not lessthan $10,000 and not more than $100,000 for each such failure.
ARTICLE 19 – CLEAN AIR AND WATER CLAUSE / CERTIFICATION[Applicable to all contracts that exceed $150,000 and to all subcontracts to prime contracts that exceed$150,000 --OR-- if facility to be used has been the subject of a conviction under the Clean Air Act (42 U.S.C.
1857c-8(c)(1) or the Federal Water Pollution Control Act (33 U.S.C. 1319(c)) and is listed by EPA --OR-- if thecontract/subcontract is not otherwise exempt.](a) The Contractor under this contract/subcontract agrees as follows:(1) To comply with all the requirements of section 114 of the Clean Air Act as amended (42 U.S.C.
1857, et seq., as amended by Public Law 91-604) and section 308 of the Federal Water Pollution Control Act(33 U.S.C. 1251 et seq., as amended by Public Law 92-500), respectively, relating to inspection, monitoring,entry, reports, and information, as well as other requirements specified in section 114 and section 308 of the
Air Act and the Water Act, respectively, and all regulations and guidelines issued thereunder before the signingof this contract by the Contracting Local Organization.
(2) That no portion of the work required by this contract will be performed in a facility listed on theEnvironmental Protection Agency List of Violating Facilities on the date when this contract was signed by theContracting Local Organization unless and until the EPA eliminates the name of such facility or facilities fromsuch listing.
(3) To use their best efforts to comply with clean air standards and clean water standards at the facilities
in which the contract is being performed.
(4) To insert the substance of the provisions of this article in any nonexempt subcontract, including thissubparagraph (a)(4).
(b) The terms used in this article have the following meanings:(1) The term “Air Act” means the Clean Air Act, as amended (42 U.S.C. 1857 et seq., as amended by
Public Law 91-604).
(2) The term “Water Act” means Federal Water Pollution Control Act, as amended (33 U.S.C. 1251 etseq., as amended by Public Law 92-55).
(3) The term “clean air standards” means any enforceable rules, regulations, guidelines, standards,
limitations, orders, controls, prohibitions, or other requirements which are contained in, issued under, orotherwise adopted pursuant to the Air Act or Executive Order 11738, an applicable implementation plan as
described in section 110(d) of the Clean Air Act (42 U.S.C. 1857c-5(d)), and approved implementation

IFB No. PCCD-22-PCW21Rehab-01

SC-17 of 18

procedure or plan under section 111(c) or section 111(d), respectively, of the Air Act (42 U.S.C. 1857c-6(c) or(d)), or an approved implementation procedure under section 112(d) of the Air Act (42 U.S.C. 1857c-7(d)).
(4) The term “clean water standards” means any enforceable limitation, control, condition, prohibition,
standards, or other requirement which is promulgated pursuant to the Water Act or contained in a permit issued
to a discharger by the Environmental Protection Agency or by a State under an approved program, as
authorized by section 402 of the Water Act (33 U.S.C. 1342), or by a local government to ensure compliancewith pretreatment regulations as required by section 307 of the Water Act (3 U.S.C. 1317).
(5) The term “compliance” means compliance with clean air or water standards. Compliance shall alsomean compliance with the scheduled or plan ordered or approved by a court of competent jurisdiction, theEnvironmental Protection Agency or any air or water pollution control issued pursuant thereto.
(6) The term “facility” means any building, plant, installation, structure, mine, vessel or other floating
craft, location or site of operations, owned, leased or supervised by a sponsor, to be utilized in the performanceof a contract or subcontract. Where a location of site of operations contains or includes more than one building,plant, installation, or structure, the entire location shall be deemed to be a facility except where the Director,
Office of Federal Activities, Environmental Protection Agency, determines that independent facilities arecollated in one geographical area.
[end of clause]
Per Contractor’s certification given in PART I, Subpart C, Exhibit E, Section I, the certification below (and theabove Clean Air and Water Clause) shall be included in every nonexempt subcontract and all subcontractors
shall certify accordingly:
Clean Air and Water Certification[Applicable to all subcontracts to a prime contract that exceeds $150,000 --OR-- if facility to be used has been
the subject of a conviction under the Clean Air Act (42 U.S.C. 1857c-8(c)(1) or the Federal Water Pollution
Control Act (33 U.S.C. 1319(c)) and is listed by EPA --OR-- if any subcontract is not otherwise exempt.]
Subcontractor certifies as follows:(1) Any facility to be utilized in the performance of work described in this subcontract[ IS / IS NOT ] listed on the Environmental Protection Agency List of Violating Facilities.
(2) Prior to the signing of a subcontract, to promptly notify the Contracting Local Organization (CLO) under
the prime contract of the receipt of any communication from the Director, Office of Federal Activities,
U.S. Environmental Protection Agency, indicating that any facility which he/she proposes to use for the
performance of the subcontract is under consideration to be listed on the Environmental Protection
Agency List of Violating Facilities.
(3) To include substantially this certification, including this subparagraph (3), in every nonexempt
subcontract.

ARTICLE 20 – SUBCONTRACTOR CERTIFICATION (TPDES)
All subcontractors at any tier who perform work that may impact pollution control measures per PART IV,
Construction Specification 5 (Pollution Control) must complete and submit, prior to performing any work on
the project, a “Subcontractor Certification” form regarding Texas Pollutant Discharge Elimination System(TPDES) permit. This form is included in Appendix A attachment to Construction Specification 5.

IFB No. PCCD-22-PCW21Rehab-01

SC-18 of 18

This page intentionally left blank.

IFB No. PCCD-22-PCW21Rehab-01

PART IV – Divider & Index SheetPART IV: SPECIFICATIONSPlum Creek Watershed – Rehabilitation
Floodwater Retarding Structure Site 21
Construction Specifications
No.
2
3
5
6
7
8
9
11
21
23
24
26
27
28
31
34
36
41
45
53
61
71
81
91
92
94
95
99
401
446

Total
# Pages

Title
Clearing and Grubbing
Structure Removal
Pollution Control
APPENDIX A: SWP3 (+ cover page)
Seeding, Sprigging, and Mulching
Construction Surveys
Mobilization and Demobilization
Traffic Control
Removal of Water
Excavation
Earthfill
Drainfill
Topsoiling
Diversions and Waterways
Lime Treated Earthfill
Concrete for Major Structures
Steel Reinforcement
Roller Compacted Concrete
Reinforced Concrete Pressure Pipe Conduits
Plastic Pipe
Ductile-Iron Pipe
Rock Riprap
Water Control Gate
Metal Fabrication and Installation
Chain Link Fence
Field Fence
Contractor Quality Control
Geotextile
Conduit Abandonment
Geotechnical Instrumentation & Monitoring
Grouted Anchor Barsi – PART IV

4
4
6
14
6
4
4
4
4
8
8
6
4
4
8
20
6
20
4
10
4
4
4
4
4
4
10
4
6
20
2

IFB No. PCCD-22-PCW21Rehab-01

PART IV – Divider & Index Sheet

Material Specifications
No.

Title

# Pages

Date

303

Lime (Quicklime)2

8/2021521

Aggregates for Drainfill and Filters

2

1/2014522

Aggregates for Portland Cement Concrete2

5/2001

523

Rock for Riprap

49/2018524

Aggregates for Roller Compacted Concrete2

1/2014531

Portland Cement2

5/2001532

Supplementary Cementitious Materials

2

4/2015533

Chemical Admixtures for Concrete2

11/2005

534

Concrete Curing Compound2

1/2009535

Preformed Expansion Joint Filler

25/2001

536

Sealing Compound for Joints for Concrete
and Concrete Pipe2

9/2018537

Nonmetallic Waterstops

4

5/2001

539

Steel Reinforcement (for concrete)2

1/2009541

Reinforced Concrete Pressure Pipe

4

5/2001

547

Plastic Pipe4

10/2017553

Ductile-Iron Pipe2

1/2014571

Slide Gates

6

9/2018

581

Metal

2

11/2005

582

Galvanizing

2

5/2001

591

Field Fencing Material

2

9/2018592

Geotextile

49/2018593

Lime (hydrated lime)2

11/2005

ii – PART IV

Construction Specification 2—Clearing and Grubbing

1. Scope
The work consists of clearing and grubbing and disposal of trees, snags, logs, brush, stumps, shrubs, and rubbish
from the designated areas.
2. Protection of existing vegetation
Trees and other vegetation designated to remain undisturbed shall be protected from damage throughout the duration of the construction period. Any damages resulting from the contractor's operations or neglect shall be repairedby the contractor.
Earthfill, stockpiling of materials, vehicular parking, and excessive foot or vehicular traffic shall not be allowed
within the drip line of vegetation designated to remain in place. Vegetation damaged by any of these or similar actions shall be replaced with viable vegetation of the same species, similar condition, and like size unless otherwise
approved by the contracting officer.
Any cuts, skins, scrapes, or bruises to the bark of the vegetation shall be carefully trimmed and local nursery accepted procedures used to seal damaged bark.
Any limbs or branches 0.5 inch or larger in diameter that are broken, severed, or otherwise seriously damaged
during construction shall be cut off at the base of the damaged limb or branch flush with the adjacent limb or tree
trunk. All roots 1-inch or larger in diameter that are cut, broken, or otherwise severed during construction operations shall have the end smoothly cut perpendicular to the root. Roots exposed during excavation or other operations shall be covered with moist earth or backfilled as soon as possible to prevent the roots from drying out.

3. Marking
The limits of the area(s) to be cleared and grubbed will be marked by stakes, flags, tree markings, or other suitable
methods. Trees to be left standing and uninjured will be designated by special markings placed on the trunk about
6 feet above the ground surface.
4. Clearing and grubbing
All trees not marked for preservation and all snags, logs, brush, stumps, shrubs, rubbish, and similar materials shallbe cleared from within the limits of the designated areas. Unless otherwise specified, all stumps, roots, and root
clusters that have a diameter of 1 inch or larger shall be grubbed out to a depth of at least 2 feet below subgrade forconcrete structures and 1 foot below the ground surface at embankment sites and other designated areas.
5. Disposal
All materials cleared and grubbed from the designated areas shall be disposed of at locations shown on the drawings or in a manner specified in section 7. The contractor is responsible for complying with all local rules and regulations and the payment of any and all fees that may result from disposal at locations away from the project site.
6. Measurement and payment
Method 1—For items of work for which specific units prices are established in the contract, the cleared andgrubbed area is measured to the nearest 0.1 acre. Payment for clearing and grubbing is made for the total area
within the designated limits at the contract unit price. Such payment will constitute full compensation for all labor,
equipment, tools, and all other items necessary and incidental to the completion of the work.

(210–VI–NEH, May 2001)

2–1

Method 2—For items of work for which specific unit prices are established in the contract, the length of thecleared and grubbed area is measured to the nearest full station (100 feet) along the line designated on the drawing
or identified in the specifications. Payment for clearing and grubbing is made for the total length within the designated limits at the contract unit price. Such payment will constitute full compensation for all labor, equipment,
tools, and all other items necessary and incidental to the completion of the work.
Method 3—For items of work for which specific unit prices are established in the contract, each tree, stump, andsnag having a diameter of 4 inches or larger and each log having a diameter of 4 inches or larger and a length of 10
feet are measured before removal. The size of each tree and snag is determined by measuring its trunk at breast
height above the natural ground surface. The size of each log is determined by measuring the butt and by measuring its length from butt to tip. The size of each stump is measured at the top. Diameter is determined by dividing
the measured circumference by 3.14.
Payment for clearing and grubbing of each tree, stump, and snag having a diameter of 4 inches or larger and eachlog having a diameter of 4 inches or larger and a length of 10 feet or larger is made at the contract unit price for its
size designation as determined by the following schedule:
Measured diameter

Size designation		(in)		

(in)

		
		
		
		
		
		

4 to 8		
8 to 12		
12 to 24		
24 to 36		
36 to 60 		
Over 60		

6
10
18
30
48
60

The sum of such payments shall constitute full compensation for clearing and grubbing (including the clearing andgrubbing of smaller trees, stumps, snags, logs, brush, shrubs, and roots), applicable permits and associated fees,and rubbish removal. Such payment shall constitute full compensation for all labor, equipment, tools, and all otheritems necessary and incidental to the completion of the work.
Method 4—For items of work for which specific lump sum prices are established in the contract, payment forclearing and grubbing is made at the contract lump sum price. Such payment shall constitute full compensation for
all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.
All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed in the bid schedule will be included in the payment for theitem of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 7.

7.

2–2

Items of work and construction details(210–VI–NEH, May 2001)

7. Items of Work and Construction Details
In Section 5, Disposal, all materials removed from the cleared and grubbed areas shall be chipped
and used on-site for mulch or disposed of at an offsite disposal area of the Contractor’s own
choosing in accordance with state and local regulations, or buried at areas designated or approvedby the Engineer.
In Section 6, Measurement and payment, Method 1 shall apply.
Locations for buried materials shall be designated at the time of the showing of the site toprospective bidders. Buried material shall have a minimum earthfill cover of not less than 2 feet.
The cover shall be placed in two lifts with each lift compacted by traversing the entire surface
with one tread track of the material placement equipment. The top lift shall be mounded at least 6
inches higher than the surrounding undisturbed area to prevent unsightly depressions after
settlement. The finished surface of the disposal area shall be uniformly graded to prevent
ponding of water.
All trees, snags, logs, brush, shrubs, stumps, and rubbish that are felled, detached, or otherwise
dislocated in or near stream channels shall be disposed of as specified or removed to higher
ground prior to the end of each workday. The Contractor is to take precaution, when temporarily
stockpiling cleared and grubbed materials, to guard against such cleared and grubbed materials
being floated or transported off the worksite by rainstorm runoff.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 1, Clearing and Grubbing(1)

This item shall consist of all clearing and grubbing and disposal within the work
limits. This includes the disposal of existing brush piles and downed debris
required for construction of the works of improvement as shown on the drawings.

(2)

The actual limits of required clearing and grubbing will be as designated or staked
at the time of the showing the site to prospective bidders.

(3)

Existing brush piles and downed debris shall be disposed as specified above andshall be designated at the time of the showing the site to prospective bidders.

(4)

Upon completion of the clearing and grubbing operation, all areas which have beencleared and grubbed shall be dressed to be reasonably smooth by blading, dragging
or floating. The entire area shall be reasonably free of abrupt mounds, dips andwindrows to provide a clear area for construction staking.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

2-3

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

2-4

Construction Specification 3—Structure Removal

1. Scope
The work shall consist of the removal, salvage, and disposal of structures (including fences) from the designatedareas.
2. Marking
Method 1—Each structure or structure part to be removed will be marked with stakes, flags, paint, or other suitable method.
Method 2—The area boundaries from which structures must be removed will be marked using stakes, flags, paint,
or other suitable method. Structures to remain undisturbed or to be salvaged will be designated by special markings.

3. Removal
Method 1—All structures designated for removal in the contract shall be removed to the specified extent anddepth.
Method 2—Within the areas so marked, all visible and buried structures identified shall be removed to the specified extent and depth.

4. Salvage
Structures or structure parts that are designated to be salvaged shall be carefully removed and neatly placed in thespecified or approved storage location. Salvaged structures that are capable of being disassembled shall be dismantled into individual members or sections. Such structures shall be neatly and systematically match marked withpaint before disassembly. All connectors and other parts shall be marked to indicate their proper location within
the structure and shall be fastened to the appropriate structural member or packed in suitable containers.
Material from fences designated to be salvaged shall be placed outside the work area on the property on which
the fence was originally located. Fence wire shall be rolled into uniform rolls of suitable size and neatly piled withother salvaged materials. Posts and rails shall be neatly stacked.

5. Disposal of refuse materials
Refuse materials resulting from structure removal shall be disposed of in a manner and at locations specified in
section 7 of this specification or in an acceptable manner and at locations approved by the contracting officer. Disposal by burning shall be in accordance with local rules and regulations.
6. Measurement and payment
Method 1—For items of work for which specific unit prices are established by the contract, payment for theremoval of each structure unit, except fences, is made at the contract unit price. Fences removed or removed andsalvaged are measured to the nearest linear foot. Payment for fence removal or removal and salvage is made at thecontract unit prices for each type and size of fence.
Such payment will constitute full compensation for all labor, equipment, tools, applicable permits and associatedfees for burning and disposal of refuse, and all other items necessary and incidental to the completion of the work.
Method 2—For items of work for which specific lump sum prices are established by the contract, payment forstructure removal is made at the contract lump sum price.

(210–VI–NEH, May 2001)

3–1

Such payment will constitute full compensation for all labor, equipment, tools, applicable permits and associatedfees for burning and disposal of refuse, and all other items necessary and incidental to the completion of the work.
All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed as a contract line item number in the bid schedule, is includedin the payment for the item of work to which it is made subsidiary. Such items and items to which they are madesubsidiary are identified in section 7 of this specification.

7.

3–2

Items of work and construction details(210–VI–NEH, May 2001)

7. Items of Work and Construction Details
In Section 2, Marking, Method 1 shall apply.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 2, Structure Removal, Existing Fences(1)

This item shall consist of the removal and disposal of all designated fences in theconstruction area. The Contractor shall legally dispose of materials at an authorized
off-site facility in accordance with all applicable rules and regulations. Salvage ofexisting fencing is not permitted.

(2)

The limits of fences to be removed shown on the drawings are approximate.
Additionally, some fences may exist within the construction areas that are notdelineated on the drawings. The actual limits of fences required to be removed will
be marked on the site at the time of the showing of the site to prospective bidders.

(3)

In Section 3, Removal, Method 2 shall apply. The fences shall be removed to thebottom of the footing and/or post.

(4)

In Section 6, Measurement and payment, Method 2 shall apply.

b. Bid Item 3, Structure Removal, Existing Principal Spillway(1)

This item shall consist of removing and disposing of the existing principal spillway
inlet structure, specified segments of the existing reinforced concrete pipe, concrete
cradle, and removing and disposing of all miscellaneous metalwork and equipment
including, but not limited to: concrete reinforcement, metal grating, and trash racks.
The Contractor shall legally dispose of materials at an authorized off-site facility inaccordance with all applicable rules and regulations(2)

The existing principal spillway conduit shall be used for dewatering and shallremain open until the new principal spillway system, including inlet, conduit,
impact basin, and outlet channel are constructed and fully operational, and the dam
is reconstructed to the full design cross-section over the conduit.

(3)

In Section 3, Removal, Method 1 shall apply. The limits of removal shall be as
shown on the drawings.

(4)

In Section 6, Measurement and payment, Method 2 shall apply.

(5)

Items of Work subsidiary to this bid item are:(a)

Excavation, Common, Structure Removal as specified in Construction
Specification 21.

(b)Earthfill, Structure Removal as specified in Construction Specification 23.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

3-3

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

3-4

Construction Specification 5—Pollution Control
1. Scope
The work consists of installing measures or performing work to control erosion and minimize the production of
sediment and other pollutants to water and air from construction activities.
The following BioPreferred® product categories are applicable to this specification:— mulch and compost materials— erosion control materials— fertilizers— dust suppressants— agricultural spray adjuvants

2. Material
Silt fence shall conform to the requirement of Materials Specification 592, Geotextile. All other material furnishedshall meet the requirements of the material specifications listed in section 8 of this specification.
3. Erosion and sediment control measures and works
The measures and works shall include, but are not limited to, the following:
Staging of earthwork activities—The excavation and moving of soil materials shall be scheduled to minimize
the size of areas disturbed and unprotected from erosion for the shortest reasonable time.
Seeding—Seeding to protect disturbed areas shall occur as soon as reasonably possible following completion ofthat earthwork activity.
Mulching—Mulching to provide temporary protection of the soil surface from erosion.
Diversions—Diversions to divert water from work areas and to collect water from work areas for treatment andsafe disposition. They are temporary and shall be removed and the area restored to its near original condition when
the diversions are no longer required or when permanent measures are installed.
Stream crossings—Culverts or bridges where equipment must cross streams. They are temporary and shall be
removed and the area restored to its near original condition when the crossings are no longer required or whenpermanent measures are installed.
Sediment basins—Sediment basins collect, settle, and eliminate sediment from eroding areas from impacting
properties and streams below the construction site(s). These basins are temporary and shall be removed and thearea restored to its original condition when they are no longer required or when permanent measures are installed.
Sediment filters—Straw bale filters or geotextile silt fences trap sediment from areas of limited runoff. Sediment
filters shall be properly anchored to prevent erosion under or around them. Silt fences shall be installed and maintained in accordance with ASTM D6462. These filters are temporary and shall be removed and the area restored toits original condition when they are no longer required or when permanent measures are installed.
Waterways—Waterways for the safe disposal of runoff from fields, diversions, and other structures or measures.
These works are temporary and shall be removed and the area restored to its original condition when they are nolonger required or when permanent measures are installed.

(210–VI–NEH, January 2014)

5–1

Other—Additional protection measures as specified in section 8 of this specification or required by Federal, State,
or local government.

4. Chemical pollution
The contractor shall provide watertight tanks or barrels or construct a sump sealed with plastic sheets to collectand temporarily contain chemical pollutants, such as drained lubricating or transmission fluids, grease, soaps,
concrete mixer washwater, or asphalt, produced as a by-product of the construction activities. Pollutants shall bedisposed of in accordance with appropriate state and Federal regulations. At the completion of the construction
work, tanks, barrels, and sumps shall be removed and the area restored to its original condition as specified in section 8 of this specification. Sump removal shall be conducted without causing pollution.
Sanitary facilities, such as chemical toilets, or septic tanks shall not be located next to live streams, wells, or
springs. They shall be located at a distance sufficient to prevent contamination of any water source. At the completion of construction activities, facilities shall be disposed of without causing pollution as specified in section 8 ofthis specification.

5. Air pollution
The burning of brush or slash and the disposal of other materials shall adhere to state and local regulations.
Fire prevention measures shall be taken to prevent the start or spreading of wildfires that may result from project
activities. Firebreaks or guards shall be constructed and maintained at locations shown on the drawings.
All public access or haul roads used by the contractor during construction of the project shall be sprinkled orotherwise treated to fully suppress dust. All dust control methods shall ensure safe construction operations at all
times. If chemical dust suppressants are applied, the material shall be a commercially available product specificallydesigned for dust suppression and the application shall follow manufacturer's requirements and recommendations.
A copy of the product data sheet and manufacturer's recommended application procedures shall be provided to theengineer 5 working days before the first application.

6. Maintenance, removal, and restoration
All pollution control measures and temporary works shall be adequately maintained in a functional condition forthe duration of the construction period. All temporary measures shall be removed and the site restored to near
original condition.
7. Measurement and payment
Method 1—For items of work for which specific unit prices are established in the contract, each item is measured
to the nearest unit applicable. Payment for each item is made at the contract unit price for that item. For water orchemical suppressant items used for dust control for which items of work are established in section 8 of this specification, measurement for payment will not include water or chemical suppressants that are used inappropriately
or excessive to need. Such payment will constitute full compensation for the completion of the work.
Method 2—For items of work for which lump sum prices are established in the contract, payment is made as thework proceeds and supported by invoices presented by the contractor that reflect actual costs. If the total of all
progress payments is less than the lump sum contract price for this item, the balance remaining for this item will
be included in the final contract payment. Payment of the lump sum contract price will constitute full compensation for completion of the work.
Method 3—For items of work for which lump sum prices are established in the contract, payment will be prorated
and provided in equal amounts on each monthly progress payment estimate. The number of months used for prorating shall be the number estimated to complete the work as outlined in the contractor's approved construction
schedule. The final month's prorate amount will be provided with the final contract payment. Payment as described
will constitute full compensation for completion of the work.

5–2(210–VI–NEH, January 2014)

All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed in the bid schedule is included in the payment for the item ofwork to which it is made subsidiary. Such items, and the items to which they are made subsidiary, are identified in
section 8 of this specification.

8.

Items of work and construction details(210–VI–NEH, January 2014)

5–3

8. Items of Work and Construction Details
This construction site is greater than five (5) acres in area and is subject to the Texas Pollutant
Discharge Elimination System (TPDES) requirements administered by the Texas Commission on
Environmental Quality (TCEQ). Rules for the TPDES process relative to construction sites arecontained in the TPDES General Permit NO. TXR150000. A copy of General Permit No.
TXR150000 may be found at the TCEQ website.
In conformance with TPDES General Permit TXR150000, a Storm Water Pollution Prevention
Plan (SWP3) is required for the construction site. A SWP3 is provided. The Contractor shallreview the SWP3, and shall amend the plan with a detailed work sequence outline which definesand delineates the proposed construction operation. The amended SWP3 shall be signed by theContractor and submitted to the Contracting Officer prior to issuance of the Notice to Proceed. A
copy of the approved SWP3, as amended, will be maintained at the construction site by theContractor. A copy of the permit shall be attached to the SWP3.
A copy of the Notice of Intent (NOI) shall be posted at the site until the TPDES permit number isissued for the site. An 8 ½" x 11" notice shall be posted at the site giving the following
information about the permit: permit number, contact name, contact phone and projectdescription. If a permit number has not been issued, a copy of the NOI shall be posted with thenotice.
If the Contractor identifies sediment control items, which are considered essential to theanticipated construction operation but which are not reflected by the contract bid schedule, awritten request for a contract modification will be provided to the Contracting Officer. The
request will identify the items, operation, and provide an assessment of changes to the contract
cost and performance time.
TPDES also requires an NOI and Notice of Termination (NOT) to be filed with TCEQ. The
Contractor will be responsible for submitting the Contractor’s copy of the NOI to the Engineer at
least five business days before work begins. When the contract is completed, the Contractor shallprovide the Project Engineer a copy of the NOT that he/she will file with the TCEQ.
In conformance with TPDES requirements, the Inspector and the Contractor (or the Contractor’s
Quality Control person) shall perform periodic inspections of the sediment control practices.
Inspections will be conducted bi-weekly (first work day of each week) and within 24 hours of any
rainfall event of more than 0.5 inch at the construction site. After each inspection, a written reportwill be prepared which summarizes the status of inspected items. The reports will (a) evaluate
effectiveness, (b) identify maintenance needs and/or (c) recommend remedial corrective action
and will be prepared and signed by the Engineer and the Contractor. The report shall be filed onsite in the same location as the SWP3. The Contractor shall be responsible for identified
corrective maintenance needs.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 4, Pollution Control(1)This item shall consist of performing all work and furnishing all materials
necessary to accomplish the work defined in Section 1 of this specification,

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

5-4

including all works required to implement the Storm Water Pollution Prevention
Plan, installation and maintenance of the rock filter dam, stabilized construction
entrance, and maintenance of sediment filters, but not the installation of the fabricsediment filters.
(2)

A rock filter dam shall be installed as shown on the drawings.

(3)

Rock filter dam and silt fence shall be removed and disposed of when the site iscompletely stabilized.

(4)

A stabilized construction entrance shall be installed as shown on the drawings. The
entrance shall be removed at the end of construction and returned to its original or
better condition unless the Sponsor decides to have the entrance remain in place.
The Sponsor will obtain a TxDOT temporary/permanent entrance permit if one isrequired.

(5)

In Section 7, Measurement and payment, Method 3 shall apply.

b. Bid Item 5, Silt Fence(1)

This item shall consist of furnishing and installing silt fence to the lengths andlocations designated on the drawings and otherwise needed to control sedimentfrom leaving the construction site. Maintenance and removal of installed silt fence
shall be paid for under the bid item for Pollution Control.

(2)

In Section 3, Erosion and sediment control measures and works, Sediment filters
shall be limited to geotextile sediment filters.

(3)

In Section 7, Measurement and payment, Method 1 shall apply.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

5-5

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

5-6

IFB No. PCCD-22-PCW21Rehab-01

Appendix A to SITE 21 Construction Spec 5 – Cover Sheet

SITE 21 REHAB STORM WATER POLLUTION
PREVENTION PLAN (SWP3)(12 pages)

APPENDIX A
toConstruction Specification 5 – SITE 21 Rehab
Pollution Control

Notes
A copy of TPDES General Permit No. TXR150000 is available at thefollowing internet address [PDF file requiring Adobe Acrobat Reader toview or print]:
https://www.tceq.texas.gov/assets/public/permitting/stormwater/txr150000-cgp.pdf

IFB No. PCCD-22-PCW21Rehab-01

Appendix A to SITE 21 Construction Spec 5 – Cover SheetThis page intentionally left blank.

PLUM CREEK WATERSHED
SITE 21 FLOODWATER RETARDING STRUCTURE
STORM WATER POLLUTION PREVENTION PLAN
Project Name and Location:

SITE DESCRIPTION

Plum Creek Site No. 21 is located approximately 5 miles north and 1 mile east of downtown
Lockhart, Caldwell County, Texas. From the intersection of US183 and SH142 in Lockhart,
Texas, travel north on US183 for approximately 4.8 miles to the intersection of US183 andFM1185. Travel east on FM1185 approximately 1.3 miles to the site entrance.
Latitude 29.9572° N

Longitude 97.6543° W

Primary Operators - Name and Address:
Plum Creek Conservation District
1101 W. San Antonio St.
Lockhart, TX 78644
Construction Contractor (To be determined)
Secondary Operator - Name and Address:
USDA, Natural Resources Conservation Service
101 South Main
Temple, TX 76501
DESCRIPTIONThis project will consist of rehabilitating an existing dam and reservoir. The original design ofthis structure included an earthen embankment with 2.5:1 upstream and downstream sideslopes; a
30 inch diameter concrete principal spillway pipe with a 12’-1” tall concrete riser; and a 300’
wide vegetated auxiliary spillway. The principal spillway outlet consisted of a rock armoredplunge basin that discharges into a naturally formed channel.
The rehabilitation of Site 21 include shifting the centerline of dam alignment downstream toallow the top of dam to be raised approximately 4.7 feet and the downstream embankment
sideslopes modified from 2.5:1 to 3:1; abandoning the existing vegetated spillway by extending
the dam with conventional earthfill across the spillway and into the left abutment; constructing a
300 feet wide roller compacted concrete (RCC) spillway over the top of the embankment;
lowering the principal spillway crest from 505.9 down to elevation 500.7, while maintaining theordinary water elevation of 498.8 with a port opening in the riser; installing a 42 inch diameter
principal spillway, a standard embankment style baffle riser, and a standard impact basin outlet
structure; constructing a new 16 feet wide outlet channel for the principal spillway and a 324 feetwide channel for the RCC spillway; installing a rock lined outlet for the RCC spillway system, as
well as below the impact basin; extending the right end of the dam approximately 195 feet toprovide containment; installing a rock armored wave berm and crossing berm below the RCC
structure; installing a drainage system beneath the RCC chute spillway as well a foundation toe
drain along the toe of the embankment. The reservoir will have a floodwater detention storage
capacity of approximately 3,394 ac-ft between the RCC spillway crest and the principal spillway
crest after rehabilitation. It should be noted that the reported storage includes 154.2 ac-ft ofsubmerged sediment storage below the principal spillway crest and an estimated 25.8 ac-feet of
aerated sediment storage.

The construction will consist of approximately 140,634 cu. yds. of common excavation; 135,235
cu. yds. of compacted earthfill comprised of on-site and imported materials; 12,144 cy. yds. oflime treated earthfill, along with 656 tons of lime; 7,786 cu. yds. of RCC; 1,875 tons of
cementitious materials; 197,801 sq. yds. of salvaged topsoil; 4,051 cu. yds. of drainfill; 209 cy.
yds. of flex base; 3,460 ft. of plastic pipe; 430 cu. yds. of reinforced concrete; 62,200 lbs. of
reinforcing steel; 84 cu. yds. of un-reinforced concrete; 235 ft. of 42-inch concrete pressure pipe;
7,158 tons of rock riprap, along with 270 tons of riprap bedding; 9,954 sq. yds. of geotextile; 100ft. of diversions; 7,172 ft. of barbed wire fence; 528 ft. of chain link fence; and 5,108 ft. of
sediment fence. The dam has a reported maximum height of approximately 40 feet. The dam
controls the runoff from approximately 8.63 square miles of drainage uncontrolled drainage area.
Runoff from the construction area will enter the stream on which the dam is located immediately
downstream of the rock lined outlet channel and the roller compacted concrete spillway.
Soil disturbing activities will include (in no particular order): clearing and grubbing; existing
principal spillway system abandonment operations; foundation excavations; roller compacted
concrete spillway and new principal spillway excavations; construction of diversions;construction of the access road; construction campsite; construction of rock lined outlet channel;
lime treated earthfill operations; RCC and concrete operations; embankment construction; borrow
operations; placement of topsoil; vegetation establishment; and disposal of waste materials.
The potential sources of pollution of storm water from construction operations include sedimentfrom exposed soil materials after excavation, topsoil stockpiling, earthfill, lime treated earthfill, andother disturbed areas such as haul and access roads, and work campsites. Other potential sources ofpollution are spills of fuels, lubricants, antifreeze, concrete, cement, pozzolan, lime, and chemical
dust suppressants.
RUNOFF COEFFICIENT
The runoff curve number (CN) for the construction site is approximately 73. The postconstruction CN for the site will be essentially unchanged. The completed structure is designed
to contain and release the runoff from a 100-year storm event with the combined flow through theprincipal spillway pipe and 0.2’ of flow depth through the RCC spillway. The principal spillway
will control the outflow with a maximum flow of approximately 227 cfs with the reservoir waterlevel at the crest of the RCC spillway. The total 100-year, 24 hour discharge from the combinedprincipal spillway and RCC spillway is estimated to be 313 cfs.
SITE AREA
The designated work limits of the construction site encompass approximately 96 acres (+/-)
including the construction campsites, borrow areas, and stockpile areas. The area disturbed byconstruction activities (including campsite and stockpile areas but not including borrow areas
below the permanent pool) that will require re-vegetation is approximately 41 acres.
SEQUENCE OF MAJOR ACTIVITIESThe general order of activities will be as follows:
1. Construct the access road and construction campsite
2. Construct pollution control and surface water control measures
3. Foundation stripping of embankment and designated spillway areas
4. Structural removal of the existing principal spillway inlet
5. Principal spillway, RCC spillway, and outlet channel excavations
6. Embankment excavation for embankment slope reconstruction
7. Construct foundation trench drain
8. Construct principal spillway system2

9. Prepare RCC foundation with lime treated earthfill
10. Construct RCC spillway and install rock lined outlet
11. Abandon existing principal spillway and plug remaining portions
12. Reconstruct embankment and place rock riprap on wave berm and in outlet channels
13. Construction of earthen embankment across the existing auxiliary spillway
14. Final shaping and grading including removal of water control measures
15. Final restoration of disturbed areas
16. Vegetation and irrigation
The actual sequence of construction shall correspond to the Contractor’s written plan of work.
NAME OF RECEIVING WATERS
Site 21 is located on Dry Creek, a tributary of Segment 1810 of Plum Creek which flows into theLower San Marcos River which is part of the Guadalupe River Basin.
The June 2016 Supplemental Watershed Workplan and Environmental Evaluation indicates there
are no known federally listed threatened or endangered species within the area of potential effect(APE), however there is the potential for species to occur. Review of on-line U.S. Fish andWildlife Service data indicate that there is no mapped critical habitat in the rehabilitation workarea.
A letter of permission (LOP) was obtained from the USACE on March 23, 2021 that addresses
the proposed rehabilitation of Site 21 with regards to Section 404 of the Clean Water Act.
Coordination with the Texas Parks and Wildlife Department (TPWD) indicate that a freshwater
mussel survey, as well as fish relocation plan (ARRP)would not be required (March 9, 2015),
however use of BMP’s outlined in TPWD’s “Guidelines for Aquatic Resource Relocation Plans
for Fish and Shellfish, Including Freshwater Mussels” (PWD LF T3200-1958) be followed.
There are no properties listed or eligible for listing on the National Register of Historic Places inthe vicinity of the work area. NRCS will monitor for previously undiscovered cultural resources
during construction, including prehistoric and historic artifacts and features that may appear as aresult of excavation. The NRCS cultural resources specialist will be notified if cultural resources
are encountered in the work areas. Construction activities in the area of the discovery will besuspended until the cultural resource specialist provides clearance to proceed.

3

CONTROLSEROSION AND SEDIMENT CONTROLSTABILIZATION PRACTICES
Temporary Stabilization - The average annual rainfall in the area is approximately 35 inches.
Sediment filters, consisting of silt fences and a rock filter dam will be used during construction to
help stabilize disturbed areas and collect detached sediment. Sediment filters are to be provided
along the downstream boundary of any area which is stripped of vegetation during any phase of
construction. Sediment filters are also to be provided on the downstream side of any soil material
which is stockpiled for more than 14 days. All disturbed areas will be hay mulched after
sprigging of permanent vegetation.
The construction ingress and egress will be stabilized with gravel or other stabilization materials
to prevent the tracking of mud onto public streets by vehicles leaving the construction site.
All pollution control measures will be maintained in a functional condition during theconstruction operation.
Permanent Stabilization - All cut slopes, earthfill slopes, and disturbed areas not covered withrock riprap or RCC will be protected against rilling and erosion by vegetation. Rock riprap will
be placed downstream of the impact basin and RCC outlet to protect against erosion. The
upstream face of the embankment will be armored with rock riprap to protect against wave
erosion. Diversions will be constructed to direct the runoff away from the embankment. Topsoil
will be placed on the embankment and other disturbed areas to facilitate vegetation
establishment. Temporary stabilization measures will remain in place until coverage bypermanent vegetation is at least 70 percent.
Structural Practices – A rock filter dam will be installed in the natural channel prior to its
discharge beneath FM1185. No other structural measures are anticipated for erosion andsediment control.
STORM WATER MANAGEMENT
Storm water runoff from the construction area will be filtered with sediment fences or othermeasures as needed around the excavation areas, embankment, stockpiles, campsite, and otherdisturbed areas as described above for EROSION AND SEDIMENT CONTROL. Where
construction roads cross low areas subject to concentrated storm water flow, culverts will be
installed.
WASTE DISPOSAL
Waste Materials - All organic materials from the site preparation, clearing, and clearing andgrubbing operations will be either chipped and used on site for mulch, hauled offsite or burned inaccordance with all state and local regulations. If the materials are burned on site, the residues
will be buried in the waste areas. All inorganic materials from the site preparation will bedisposed of by burying in the waste areas and covering with a minimum of 3 feet of soil. All
trash and construction debris will be collected and disposed of off-site.
Hazardous Waste - All chemical and hazardous waste materials will be disposed of off-site inaccordance with local or state regulation or as recommended by the manufacturer.
Sanitary Waste - All sanitary waste will be collected from portable units and disposed of inaccordance with local regulations.

4

Dust Control - Dust will be controlled on all haul roads and access roads by sprinkling withwater.

5

CERTIFICATION OF COMPLIANCE WITH FEDERAL, STATE, AND LOCALREGULATIONSAll local and State regulations will be adhered to concerning the burning of organic materials or
disposal of organic, chemical, and sanitary waste. The rehabilitation project will be conducted inaccordance with the recommendations presented by the U.S. Department of the Army Corps ofEngineers letter of permission (LOP). The Texas Commission on Environmental Quality(TCEQ) has issued Texas Pollutant Discharge Elimination System (TPDES) permits for storm
water discharges from construction activities under Section 402(p) of the CWA. There are noother applicable State or Federal requirements for sediment and erosion site plans or storm watersite management site plans.

MAINTENANCE AND INSPECTION PROCEDURES

The Contractor, ______________________________________, will be responsible forintermittent review and inspection of the operation and maintenance of all pollution control
measures throughout the life of the contract. Inspection of the conditions and the need for repair
shall be made within 24 hours of each rainfall event of 0.5 inch or greater. Daily inspections of
the need for cleanup of chemical spills and sanitary facilities will be performed.
Routine inspection of disturbed areas, storage areas, stockpiled materials, traffic areas andsediment filters shall be made every seven (7) days.
A maintenance inspection report will be made after each inspection. The report will be
documented in the contractor’s and the project engineer’s daily job diary maintained on the job.
The report will be prepared in accordance with Part V of the general permit.
The report will document the dates when major grading activities occur, the dates whenconstruction activities temporarily or permanently cease on a portion of the site, and the dates
when stabilization measures are initiated. Each report will be attached to the Storm Water
Pollution Prevention Plan (SWP3) and remain with the SWP3 on site. Each report will be
retained as part of the SWP3 for at least three (3) years from the date the site is finally stabilized.
The SWP3, a copy of the permit or permit language, and all inspection reports shall be available
at a central location on site for the use of all operations and those who have responsibilities under
the SWP3.

6

NON-STORM WATER DISCHARGES

It is expected that the following non-storm water discharges may occur from the site during theconstruction period:
Water for dust control
Water for adjustment of moisture in earthfill and backfill operations
Water for batching RCC
Water for lime treated earthfill processing___________________________________________________________________________________________________________________________INVENTORY FOR POLLUTION PREVENTION PLAN

The following list of materials or substances are expected to be present during construction:
Concrete
Portland Cement
Petroleum Based Products
Wood and Lumber
Plastics
Concrete Air-Entraining Admixtures
Curing Compound for Concrete
Concrete Joint Sealer
Chemical Fertilizers
Concrete Water-Reducing and Set-Retarding Admixture
Paint
Cement Based Coating Material
Drainfill
Rock Riprap
Antifreeze
Lime___________________________________________________________________________________________________________________________SPILL PREVENTION - MATERIAL MANAGEMENT PRACTICESThe following are the material management practices that will be used to reduce the risk of spills
or other accidental exposure of materials and substances to storm water runoff.
Good Housekeeping - The following good housekeeping practices will be followed on site
during project construction:
An effort will be made to store only enough product required to do the job.
All materials stored on site will be stored in a neat, orderly manner in theirappropriate containers and, if possible, under a roof or other enclosure.

7

Products will be kept in their original containers with the original manufacturer's
label.
Whenever possible, all of a product will be used up before disposing of the container.
Manufacturers' recommendations for proper use and disposal will be followed.
The contractor's job superintendent will be responsible for the proper use, storage,
and disposal of materials on site.
Hazardous Products - These practices will be used to reduce the risks associated with hazardous
materials:
Products will be kept in original containers unless they are not resealable.
Original labels and material safety data will be retained.
If surplus product must be disposed of, manufacturers' or local and State
recommended methods for proper disposal will be followed.

PRODUCT SPECIFIC PRACTICESPetroleum Products - All on-site vehicles will be monitored for leaks and receive regularpreventive maintenance to reduce the chance of leakage. Petroleum products will be stored intightly sealed containers which are clearly labeled. The storage and dispensing of all petroleum
products will be in accordance with part 1926.152 of the OSHA Construction Industry Safety and
Health Standards. All spills of petroleum products will be cleaned up within 7 days. All
contaminated soils will be removed from the site and disposed of in accordance with State andlocal regulations.
Concrete Trucks - Concrete trucks will discharge all surplus concrete at a designated location.
After all concrete has been placed, the surplus concrete will be buried in an approved site andcovered with a minimum of 4 feet of soil. The wash water from the concrete trucks will bedischarged into an approved lined pit. The pit will be emptied at the completion of construction
and disposed of in accordance with State and local regulations. The pit will be filled and gradedto match the adjacent ground surface.
Paints - All containers will be tightly sealed and stored when not required for use. Excess paintwill not be disposed of on-site but will be disposed of in accordance with manufacturers'
instructions or State and local regulations.

SPILL CONTROL PRACTICESIn addition to the good housekeeping and material management practices discussed in theprevious sections of this plan, the following practices will be followed for spill prevention andcleanup:
Manufacturers' recommended methods for spill cleanup will be followed.
All spills of hazardous materials will be cleaned up immediately after discovery.
Spills of toxic or hazardous materials will be reported to the appropriate State or local
government agency.
Contractor, ______________________________________, will be responsible for spill
prevention and cleanup.

8CONTRACTOR CERTIFICATIONI certify under penalty of law that I understand the terms and conditions of the general Texas
Pollutant Discharge Elimination System (TPDES) permit that authorizes the storm water
discharges associated with industrial activity from the construction site identified as part of thiscertification. I also understand that I am responsible for all on-site requirements of the Storm
Water Pollution Discharge Plan.
Name:______________________________

Title:______________________________

Firm:______________________________

Date: ____________

Address: ________________________________________________________________________________________________________________________
Phone: ________________________________________

10

SUBCONTRACTOR CERTIFICATIONI certify under penalty of law that I understand the terms and conditions of the general Texas
Pollutant Discharge Elimination System (TPDES) permit that authorizes the storm water
discharges associated with industrial activity from the construction site identified as part of thiscertification.
Name:______________________________

Title:______________________________

Firm:______________________________

Date: ____________

Address: ________________________________________________________________________________________________________________________
Phone: ________________________________________Name:______________________________

Title:______________________________

Firm:______________________________

Date: ____________

Address: ________________________________________________________________________________________________________________________
Phone: ________________________________________

11

IFB No. PCCD-22-PCW21Rehab-01

SWP3

This page intentionally left blank.

12Construction Specification 6—Seeding, Sprigging, and Mulching
1.

Scope

The work consists of preparing the area for treatment; furnishing and placing seed, sprigs, mulch, fertilizer, inoculant, lime, and othersoil amendments; and anchoring mulch in designated areas as specified.
The following BioPreferred® product categories are applicable to this specification:— Mulch and compost materials— Erosion control materials— Fertilizers— Agricultural spray adjuvants

2.

Material

Seed—All seed must conform to the current rules and regulations of the State where it is being used and must be from the latest crop
available. It must meet or exceed the standard for purity and germination listed in section 7.
Seed must be labeled in accordance with State laws and U.S. Department of Agriculture rules and regulations under the Federal Seed
Act in effect on the date of invitations for bids. Bag tag figures are evidence of purity and germination. No seed may be accepted witha test date of more than 9 months before the date of delivery to the site.
Seed that has become wet, moldy, or otherwise damaged in transit or storage will not be accepted. The percent of noxious weed seed
allowable must be as defined in the current State laws relating to agricultural seeds. Each type of seed must be delivered in separate
sealed containers and fully tagged unless an exception is granted in writing by the contracting officer.
Fertilizer—Unless otherwise specified, the fertilizer must be a commercial-grade fertilizer. It must meet the standard for grade andquality specified by State law. Where fertilizer is furnished from bulk storage, the contractor must furnish a supplier’s certification ofanalysis and weight. When required by the contract, a representative sample of the fertilizer must be furnished to the contracting
officer for chemical analysis.
Inoculants—The inoculant for treating legume seeds must be a pure culture of nitrogen-fixing bacteria prepared specifically for the
species and must not be used later than the date indicated on the container or as otherwise specified. A mixing medium, as
recommended by the manufacturer, must be used to bond the inoculant to the seed. Two times the amount of the inoculant
recommended by the manufacturer must be used, except that four times the amount must be used when seed is applied using ahydraulic seeder. Seed must be sown within 24 hours of treatment and must not remain in the hydraulic seeder longer than 4 hours.
Lime and other soil amendments—Lime must consist of standard ground agriculture limestone, or approved equivalent. Standard
ground agriculture limestone is defined as ground limestone meeting current requirements of the State department of agriculture.
Other soil amendments must meet quality criteria and application requirements specified in section 7.
Mulch tackifiers—Asphalt emulsion tackifiers must conform to the requirements of ASTM D977, Specification for Emulsified
Asphalt. The emulsified asphalt may be rapid setting, medium setting, or slow setting. Nonasphaltic tackifiers required because ofenvironmental considerations must be as specified in section 7.
Straw mulch material—Straw mulch must consist of wheat, barley, oat or rye straw, hay, grass cut from native grasses, or other plants
as specified in section 7. The mulch material must be air-dry, reasonably light in color, and must not be musty, moldy, caked, orotherwise of low quality. The use of mulch that contains noxious weeds is not permitted. The contractor must provide a method
satisfactory to the contracting officer for determining weight of mulch furnished.
Other mulch materials—Mulching materials, such as wood cellulose fiber mulch, mulch tackifiers, synthetic fiber mulch, netting, andmesh may be required for specialized locations and conditions. These materials, when specified, must be accompanied by the
manufacturer’s recommendations for methods of application.

3.

Seeding mixtures, sod, sprigs, and dates of planting

The application rate per acre for seed mixtures, sprigs, or sod and date of seeding or planting must be as shown on the plans or as
specified in section 7.
(210-VI-NEH, Amend. 2, Sept. 2018)

6–1

4.

Seedbed preparation and treatment

Areas to be treated must be dressed to a smooth, firm surface. On sites where equipment can operate on slopes safely, the seedbed
must be adequately loosened (4 to 6 inches deep) and smoothed. Depending on soil and moisture conditions, disking or cultipacking,or both, may be necessary to properly prepare a seedbed. Where equipment cannot operate safely, the seedbed must be prepared byhand methods by scarifying to provide a roughened soil surface so that broadcast seed will remain in place.
If seeding is to be accomplished immediately following construction operations, seedbed preparation may not be required except on acompacted, polished, or freshly cut soil surface.
Rocks larger than 6 inches in diameter, trash, weeds, and other debris that will interfere with seeding or maintenance operations must
be removed or disposed of as specified in section 7.
Seedbed preparation must be discontinued when soil moisture conditions are not suitable for the preparation of a satisfactory seedbed
as determined by the responsible engineer.

5.

Seeding, sprigging, fertilizing, mulching, and stabilizing

All seeding or sprigging operations must be performed in such a manner that the seed or sprigs are applied in the specified quantities
uniformly in the designated areas. The method and rate of seed application must be as specified in section 7. Unless otherwise
specified, seeding or sprigging must be accomplished within 2 days after final grading is completed and approved.
Fertilizer, lime, and other soil amendments must be applied as specified in section 7. When specified, the fertilizer and soil
amendments must be thoroughly incorporated into the soil immediately following surface application.
The rate, amount, and kind of mulching or mesh must be as specified in section 7. Mulches must be applied uniformly to thedesignated areas. They must be applied to areas seeded not later than 2 working days after seeding has been performed. Straw mulch
material must be stabilized within 24 hours of application using a mulch crimper or equivalent anchoring tool or by a suitabletackifier. When the mulch crimper or equivalent anchoring tool is used, it must have straight blades and be the type manufactured
expressly for and capable of firmly punching the mulch into the soil. Where the equipment can be safely operated, it must be operated
on the contour. Hand methods must be used where equipment cannot safely operate to perform the work required.
The tackifier must be applied uniformly over the mulch material at the specified rate, or it must be injected into the mulch material as
it is being applied. Mesh or netting stabilizing materials must be applied smoothly but loosely on the designated areas. The edges ofthese materials must be buried or securely anchored using spikes or staples as specified in section 7.
The contractor must maintain the mesh or netting areas until all work under the contract has been completed and accepted.
Maintenance must consist of the repair of areas damaged by water erosion, wind, fire, or other causes. Such areas must be repaired toreestablish the intended condition and to the design lines and grades required by the contract. The areas must be refertilized, reseeded,
and remulched before the new application of the mesh or netting.

6.

Measurement and payment

Method 1—For items of work for which specific unit prices are established in the contract, each area treated is measured as specified
in section 7 and the area is calculated to the nearest 0.1 acre. Payment for treatment is made at the contract unit price for thedesignated treatment, which will constitute full compensation for completion of the work.
When specified as an item of work, mesh or netting is measured to the nearest square yard of surface area covered and accepted.
Payment is made at the contract unit price and will constitute full compensation for completion of the work.

6–2(210-VI-NEH, Amend. 2, Sept. 2018)

Method 2—For items of work for which specific lump-sum prices are established in the contract, the quantity of work will not bemeasured for payment. Payment for this item is made at the contract lump-sum price for the item and constitutes full compensation forthe completion of the work.
Method 3—For items of work for which lump-sum prices are established in the contract, payment is made as the work proceeds.
Progress payments are determined as specified in section 7. Payment of the lump sum contract price constitutes full compensation forcompletion of the work.
All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any item of work
described in the contract but not listed in the bid schedule is included in the payment for the item of work to which it is madesubsidiary. Such items and the items to which they are made subsidiary are identified in section 7.

7.

Items of work and construction details(210-VI-NEH, Amend. 2, Sept. 2018)

6–3

7. Items of Work and Construction Details
In Section 5, Seeding, sprigging, fertilizing, mulching, and stabilizing, straw mulch material shallconsist of coastal bermudagrass or a native bluestem mix and the rate of application shall be 2-1/2
tons per acre. Mulches shall be stabilized by a non-asphaltic tackifier and shall be applied at a rateof 40 pounds per acre or by a mechanical crimper. The Contractor shall submit the
manufacturer’s product data and installation instructions for the tackifier to the Contracting
Officer for approval of the product.
When working on slopes which are steeper than 3:1 horizontal to vertical, all rubber tire
equipment on the slope will be held with truck or tractor and winch line with the truck or tractor
operating along the crown of the embankment or other suitable flat surface. As an alternative,
track (crawler) equipment with a low center of gravity may be used to perform work on slopes
without a winch line requirement when operated in accordance with applicable OSHA
requirements.
Fertilizer shall be of the pelleted form and shall be uniformly mixed. Prior to planting thegrasses, fertilizer shall be applied and worked into the soil by disking with a weighted tandem
disk to a depth of approximately 4 inches. No fertilizer shall be applied when the ground isexcessively wet, frozen, or otherwise in an untillable condition. The rate of application of thefertilizer shall be thirty (30) pounds of nitrogen (N), forty (40) pounds of phosphorus (P) and zero(0) pounds of potassium (K) per acre.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 6, Vegetation, Sprigging(1)

This item shall consist of preparing the seedbed and furnishing and applying sprigs,
straw mulch, tackifer and fertilizer to all areas on which topsoil is designated to beplaced and other disturbed areas except those located below the lowest ungatedoutlet (elevation 498.8) on the upstream side of the dam.

(2)

In Section 6, Measurement and payment, Method 1 will apply.

(3)

Sprigging shall be conducted between February 15 and May 1.

(4)Sprigging shall be conducted with a mechanical sprigging machine. Coastal
bermudagrass sprigs shall be applied at the rate of 48 bushels or 60 cu. ft. per acre.
The distance between rows shall not exceed 20 inches. Sprigs shall be placed inmoist soil approximately 3 inches deep and packed. Hand sprigging may be used inaddition to the sprigging machine in inaccessible areas.

(5)

Coastal bermudagrass sprigs shall consist of healthy, uninjured, live stolons andrhizomes free from excessive foreign matter. Excess top growth shall be removed
before sprigs are harvested. Sprigs shall be obtained from a source within a radiusof 100 miles of the works of improvement to be planted. Sprigs shall not be cut or
chopped shorter than 4 inches. Care shall be exercised to see that harvested sprigs
do not lie exposed to the sun for more than 30 minutes before they are stacked inpiles and covered or loaded for transporting to the planting site. Harvested sprigs
shall be watered en route to the planting site and kept covered and moist until

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

6-4

planted. Not more than 30 hours shall elapse between initial harvest and planting
the sprigs.
(6)

Disturbed areas and slopes in the reservoir area below the elevation of the lowest
ungated outlet shall not be chisel plowed or disked. Permanent vegetation isrequired on disturbed areas but not on areas within the reservoir below theelevation of the lowest ungated outlet. The plowing shall be on the approximate
contour. Plowing will not be permitted when the soil is in an excessively wet or
frozen or otherwise untillable condition. The ground surface shall be left
reasonably smooth and free of windrows, ridges, or depressions.

b. Bid Item 7, Irrigation System(1)

This item shall consist of furnishing and installing a temporary solid set sprinkler
irrigation system as needed to irrigate the areas as designated in Section 7.a. of thisspecification.

(2)

The Contractor shall furnish to the Contracting Officer, in writing, a proposed planfor the irrigation system and application 30 days before installing the irrigation
system. The plan shall show the layout, size of all components, sprinkler headspacing, and methods to determine the application and distribution efficiencies.
Acceptance of this plan or the waiving of the plan requirement will not relieve theContractor of the responsibilities for completing the specified work.

(3)

The system shall be adequate to apply the volume of water and meet the application
requirements specified in Sections 7.c. (2) and 7.c. (4) of this specification. The
application of irrigation shall not cause runoff. The application shall be uniform
ensuring that at any point the irrigated area shall be within 20% of the required
application.

(4)

The Contractor shall furnish all equipment, operators, maintenance, operating
supplies, and materials needed to install the system. The Contractor shall furnish
in-line, propeller type water meter (s) with volumetric calibration. The meter(s)shall be installed so that all water applied for the irrigation of vegetated areas under
the contract will be metered.

(5)

Unless otherwise noted, the system shall be removed upon completion of all
irrigation applications.

(6)

In Section 6, Measurement and payment, Method 2 will apply.

c. Bid Item 8, Irrigation Water(1)

This item shall consist of applying irrigation water to the areas designated in
Section 7.a. of this specification. It shall include the cost of water and labor.

(2)

The estimated application rate and schedule of irrigations will be as follows: 1stirrigation 2 inches, 2nd, 3rd and 4th irrigations ½ inch at 2-day intervals and thentwice a week for the next 4 weeks at ½ inch applications. Additional irrigation or
adjustment in the application rates may be required as determined and approved by
the Engineer until 50% vegetative cover is established.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

6-5

(3)

The Contractor shall be responsible for the water source.

(4)

All areas will be irrigated with a sprinkler irrigation system. The total irrigation at
any one time will be based on need as determined by the Engineer. The irrigation
system shall produce a reasonable uniform distribution of the required application
over the irrigated area without excessive runoff or erosion. The watering efficiency
shall not be less than 85%. Adjustments in sprinkler spacing, nozzle sizes,
pressures, or in the gross water applied shall be made when needed to accomplish
the above objectives.

(5)

In Section 6, Measurement and payment, Method 1 will apply. Measurement for
payment will be 1,000 gallon units and will be measured to the nearest 1,000
gallons based on the applied volume determined from the readings of the in-line
water meter(s). An adjustment in the volume of water shall be applied for
application efficiency less than 85%.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

6-6

Construction Specification 7—Construction Surveys
1. Scope
The work consists of performing all surveys, measurements, and computations required by this specification.
2. Equipment and material
Equipment for construction surveys shall be of a quality and condition to provide the required accuracy. The equipment shall be maintained in good working order and in proper adjustment at all times. Records of repairs, calibration tests, accuracy checks, and adjustments shall be maintained and be available for inspection by the engineer.
Equipment shall be checked, tested, and adjusted as necessary in conformance with manufacturer's recommendations.
Material is field notebooks, stakes, templates, platforms, equipment, spikes, steel pins, tools, and all other items
necessary to perform the work specified.

3. Quality of work
All work shall follow recognized professional practice and the standards of the industry unless otherwise specified
in section 9 of this specification. The work shall be performed to the accuracy and detail appropriate for the typeof job. Notes, sketches, and other data shall be complete, recorded neatly, legible, reproducible and organized tofacilitate ease in review and allow reproduction of copies for job documentation. Survey equipment that requires
little or no manual recording of field data shall have survey information documented as outlined in section 9 of thisspecification.
All computations shall be mathematically correct and shall include information to identify the bid item, date, andwho performed, checked, and approved the computations. Computations shall be legible, complete, and clearly
document the source of all information used including assumptions and measurements collected.
If a computer program is used to perform the computations, the contractor shall provide the engineer with thesoftware identification, vendor's name, version number, and other pertinent data before beginning survey activities.
Computer generated computations shall show all input data including values assigned and assumptions made.
The elevations of permanent and temporary bench marks shall be determined and recorded to the nearest 0.01
foot. Differential leveling and transit traverses shall be of such precision that the error of vertical closure in feetshall not exceed plus or minus 0.1 times the square root of the traverse distance in miles. Linear measurements
shall be accurate to within 1 foot in 5,000 feet, unless otherwise specified in section 9 of this specification. The angular error of closure for transit traverses shall not exceed 1 minute times the square root of the number of angles
turned.
The minimum requirements for placing slope stakes shall be at 100-foot stations for tangents, as little as 25 feetfor sharp curves, breaks in the original ground surface and at any other intermediate stations necessary to ensure
accurate location for construction layout and measurement. Slope stakes and cross sections shall be perpendicular
to the centerline. Significant breaks in grade shall be determined for cross sections. Distances shall be measured
horizontally and recorded to the nearest 0.1 foot. Side shots for interim construction stakes may be taken with ahand level.
Unless otherwise specified in section 9 of this specification, measurements for stationing and establishing the location of structures shall be made to the nearest 0.1 foot.

(210–VI–NEH, January 2009)7–1

Elevations for concrete work, pipes, and mechanical equipment shall be determined and recorded to the nearest
0.01 foot. Elevations for earth work shall be determined and recorded to the nearest 0.1 foot.

4. Primary control
The baselines and bench marks for primary control, necessary to establish lines and grades needed for construction, are shown on the drawings and have been located on the job site.
These baselines and bench marks shall be used as the origin of all surveys, layouts, and measurements to establish
construction lines and grades. The contractor shall take all necessary precautions to prevent the loss or damage ofprimary control points. Any stakes or control points lost or damaged by construction activity will be reestablishedby the contractor or at contractor expense.

5. Construction surveys
Before work starts that requires contractor performed surveys, the contractor shall submit in writing for the engineer's review: the name, qualifications, and experience of the individuals to be assigned to the survey tasks.
Method 1—Contractor performed surveys shall include:• checking and any supplemental or interim staking• performing quantity surveys, measurements, and computations for progress payment• other surveys as described in section 9 of this specification
Method 2—Contractor performed surveys shall consist of all work necessary for:• establishing line and grade for all work
• setting slope stakes for all work
• checking and any supplemental or interim staking• establishing final grade stakes• performing quantity surveys, measurements, and computations for progress payment• other surveys as described in section 9 of this specification
Method 3—Contractor performed surveys shall consist of all work necessary for:• establishing line and grade for all work
• setting slope stakes for all work
• checking and any supplemental or interim staking• establishing final grade stakes• performing quantity surveys, measurements, and computations for progress payments• performing original (initial) and final surveys for determinations of final quantities• other surveys as described in section 9 of this specification.

6. Staking
The construction staking required for the item shall be completed before work on any item starts. Construction
staking shall be completed as follows or as otherwise specified in section 9 of this specification:
Clearing and grubbing—The boundary of the area(s) to be cleared and grubbed shall be staked or flagged at a
maximum interval of 200 feet, closer if needed, to clearly mark the limits of work. When contractor staking is thebasis for determining the area for final payment, all boundary stakes will be reviewed by the engineer before startof this work item.
7–2(210–VI–NEH, January 2009)

Excavation and fill—Slope stakes shall be placed at the intersection of the specified slopes and ground line.
Slope stakes and the reference stakes for slopes shall be marked with the stationing, required cut or fill, slope ratio,
and horizontal distance from the centerline or other control line. The minimum requirements for placing slope
stakes is outlined in section 3, Quality of work.
Structures—Centerline and offset reference line stakes for location, alignment, and elevation shall be placed forall structures.

7. Records
All survey data shall be recorded in fully identified standard hard-bound engineering survey field notebooks withconsecutively numbered pages. All field notes and printed data shall include the purpose or description of thework, the date the work was performed, weather data, sketches, and the personnel who performed and checked
the work. Electronically generated survey data and computations shall be bound, page numbered, and cross referenced in a bound field notebook containing the index for all survey activities. All work shall follow recognizedprofessional practice.
The construction survey records shall be available at all times during the progress of the work for examination anduse by the engineer and when requested, copies shall be made available. The original field notebooks and other records shall be provided to and become the property of the owner before final payment and acceptance of all work.
Complete documentation of computations and supporting data for progress payments shall be submitted to the engineer with each invoice for payment as specified in section 9 of the specification. When the contractor is required
to conduct initial and final surveys as outlined in section 5, Construction Surveys, notes shall be provided as soon
as possible after completion to the engineer for the purpose of determining final payment quantities.

8. Payment
Method 1—For items of work for which lump sum prices are established in the contract, payment is made as thework proceeds, after presentation of correct and accurate invoices by the contractor showing related costs and evidence of the charges of suppliers, subcontractors, and others for supplies furnished and work performed. Invoices
for the total amount of the contract price will not be accepted until all surveys are complete and required documentation has been determined complete. If the total of such payments is less than the lump sum contract pricefor this item, the unpaid balance will be included in the final contract payment. Payment of the lump sum contract
price will constitute full compensation for completion of all work under the bid item.
Method 2—For items of work for which lump sum prices are established in the contract, payment is made as thework proceeds with progress payment amounts determined as a percentage of the total work planned as projectedfrom the contractor's approved construction schedule. Payment of the lump sum contract price will constitute fullcompensation for completion of all work under this bid item.
All Methods—Payment will not be provided under this item for the purchase price of materials or equipment having a residual value.
Compensation for any item of work described in the contract, but not listed in the bid schedule will be included in
the payment for the item of work to which it is made subsidiary. Such items and the item to which they are madesubsidiary are identified in section 9 of this specification.

9.

Items of work and construction details(210–VI–NEH, January 2009)

7–3

9. Items of Work and Construction Details
In Section 5, Construction surveys, Method 2 shall apply. Earthfill and excavation slopes shall bechecked and corrected to planned slope as work progresses. Finish grades of these surfaces shallbe "bluetopped" at least at each 5-foot vertical interval.
In Section 8, Payment, Method 2 shall apply.
Items of work to be performed in conformance with this specification and the construction details
are:a. Bid Item 9, Construction Surveys(1)This item shall consist of performing all work required by Section 1 of thisspecification.

(2)

All surveys shall proceed from benchmarks; reference points and/or stakes set or
established by the Contracting Local Organization (CLO). The benchmarks areshown on the drawings.

(3)

Initial and final surveys for determinations of final quantities will be performed by
the CLO.

(4)

The item of work subsidiary to this bid item is Establishment of Permanent
Reference Markers (PRM), as specified in Construction Specification 31.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

7-4

Construction Specification 8—Mobilization and Demobilization
1. Scope
The work consists of the mobilization and demobilization of the contractor's forces and equipment necessary for
performing the work required under the contract. It does not include mobilization and demobilization for specificitems of work for which payment is provided elsewhere in the contract. Mobilization will not be considered aswork in fulfilling the contract requirements for commencement of work.
2. Equipment and material
Mobilization shall include all activities and associated costs for transportation of contractor's personnel, equipment, and operating supplies to the site; establishment of offices, buildings, and other necessary general facilities
for the contractor's operations at the site; premiums paid for performance and payment bonds including coinsurance and reinsurance agreements as applicable; and other items specified in section 4 of this specification.
Demobilization shall include all activities and costs for transportation of personnel, equipment, and supplies not
required or included in the contract from the site; including the disassembly, removal, and site cleanup of offices,buildings, and other facilities assembled on the site specifically for this contract.
This work includes mobilization and demobilization required by the contract at the time of award. If additional
mobilization and demobilization activities and costs are required during the performance of the contract as a resultof changed, deleted, or added items of work for which the contractor is entitled to an adjustment in contract price,compensation for such costs will be included in the price adjustment for the item or items of work changed or
added.

3. Payment
Payment will be made as the work proceeds, after presentation of paid invoices or documentation of direct costsby the contractor showing specific mobilization and demobilization costs and supporting evidence of the charges
of suppliers, subcontractors, and others. When the total of such payments is less than the lump sum contract price,
the balance remaining will be included in the final contract payment. Payment of the lump sum contract price formobilization and demobilization will constitute full compensation for completion of the work.
Payment will not be made under this item for the purchase costs of materials having a residual value, the purchasecosts of materials to be incorporated in the project, or the purchase costs of operating supplies.

4.

Items of work and construction details(210–VI–NEH, May 2001)

8–1

4. Items of Work and Construction Details
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 10, Mobilization and Demobilization(1)

This item shall consist of performing all items of work for mobilization anddemobilization as required by Sections 1 and 2 of this specification.

(2)

The mobilization operation shall include but not be limited to the items in Section 2of this specification and the following items of work:(a)Primary access to the work area shall be two existing unpaved ranch roadoff of FM 1185 as shown on the drawings. Road base or rock, meeting thematerial requirements shown on the drawings and approved by theContracting Officer, shall be placed on the existing unpaved ranch roads
from FM 1185 to the construction campsite. The access roads shall be aminimum of 14 feet wide and be graded and smoothed to provide a surface
which can be easily traversed by automobiles. The roads shall bemaintained in a smooth rut-free condition throughout the contract period.
The Contractor is responsible for any traffic control, permits, and/or
entrance requirements specified by the County necessary for construction
and operation of the access road improvements.

(b)

As a part of this bid item the Contractor shall furnish a facility at theconstruction campsite suitable for use as a Field Office for the Contracting
Local Organization. The facility shall contain not less than 240 square feet
(8-ft-wide by 30-ft-long) having a minimum 7-ft-high ceiling. The facility
shall be constructed in a workmanlike manner and shall be weather-tight. It
shall have not less than three windows and one door. It shall have a cabinet
top range (either gas or electric) with a minimum of two burners orelements and may be either built in or portable. A microwave oven 0.80
cubic feet in size and having a minimum power rating of 650 watts output
shall be provided. A substantial workbench and a table, each 3-ft-wide by
8-ft- long with the work surface 42 inches above floor level and covered
with laminated plastic, shall be provided. Cabinet storage shelves shall be
included with the workbench. Two standard 60" x 30" office desks withdrawers and leg space, as well as one 48" x 30" adjustable top drafting
table shall be provided. Two office swivel chairs and four straight chairs
shall be provided. The floor shall have a heavy-duty vinyl or similar
covering. Walls, ceilings and floors shall be constructed in such a manneras to provide a minimum of 1.5 inches of space between inside and outside
surfaces. The 1.5-inch space shall be filled with a high- density insulationmaterial. A closet (30" wide x 42" long) having a 28-inch-wide door shallbe included. The facility shall be wired for electricity with a minimum of
three ceiling fixtures and a minimum of three wall outlets on each longwall. The facility shall be plumbed and connected to a permanent sourceof pressurized water. The Contractor shall furnish a source of potabledrinking water inside the Government’s field trailer and shall maintain asupply of potable drinking water throughout the contract period. A flush

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

8-2

toilet and a wash basin (lavatory) shall be provided within a private area,and shall be properly connected to a sanitary sewer or sanitary holdingtank. If a sanitary holding tank is utilized it shall be serviced as frequently
as necessary to maintain the flush toilet and wash basin in proper working
order and to minimize objectionable odor. A thermostatically controlledmeans that is capable of maintaining the temperature inside the facility at
75ºF in the summer with refrigerated air and 80 ºF in the winter, forheating and air conditioning the facility shall be provided. The facility shallbe built in such a manner that it is substantial and can be easily moved. A
prefabricated building or trailer will be an acceptable facility if approvedby the Contracting Officer. The Contractor shall furnish and install all
utilities to the facility. The facility shall be maintained in good condition
throughout the contract period by the Contractor, except for damages
caused by negligence of the Government or Contracting Local
Organization (CLO). The facility shall be separate and apart from any
building or facilities of the Contractor and shall be for sole use of theGovernment or CLO.
(c)

The facility shall be securely anchored or tied-down to provide maximum
possible stability against overturning by high winds. Flashing or skirting
shall be installed around the facility from floor level to ground level.

(d)Access to the door to the facility from the ground shall be provided bysubstantial steps leading to a landing having a minimum size of 5 feet wideby 6 feet long. Substantial handrails shall be provided for the steps and thelanding.

(e)

The facility shall be enclosed by a 6-ft-high chain link fence placed toprovide a minimum of 6 feet clearance between the fence and the outside
walls of the facility. One gate 4 feet in width shall be installed in the fence.

(f)

The Contractor shall furnish and install electrical service to the facility.
The electrical service provided shall meet the requirements of the latest
National Electric Code for providing electric service to the construction
trailer. The service shall be adequate to address all anticipated electricalloads and meet the minimum voltage and amperage requirements indicatedby the selected trailer and recommended by the trailer manufacturer. The
Contractor shall be responsible for supply of power to the facility officethroughout the contract period. If a portable generator is used to supply
electrical power, the Contractor shall be responsible for the complete
operation and maintenance of the generator. The generator shall remain incontinuous operation 24 hours per day and shall be located a minimum of
100 feet from the facility and shielded so as to minimize the noise in thefacility.

(g)

The facility and all utilities shall be in place at the worksite prior to thestart of work requiring continuous inspection and no later than 15 days
after receipt of the Notice to Proceed.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

8-3

(3)

(4)

The demobilization operation shall include but not be limited to the following
items of work:(a)

All debris, trash, tires, equipment, equipment parts, chains, cables, andother such items resulting from the construction operation shall, at theContractor’s expense, be removed from the work site and be salvaged by
the Contractor, or disposed of in an appropriate manner which meets all
Federal, State and Local Regulations.

(b)

All disturbed areas shall be bladed or smoothed to blend the area with thesurrounding land surface. The bladed or smoothed surface shall be free ofabrupt mounds, windrows, depressions or other irregularities that would
prevent the safe operation of ordinary farm equipment thereon. The
finished surface shall prevent diversion of surface runoff and shall prevent
standing or ponding water.

(c)

All traffic control devices, warning signs, barricades and any other material
used for traffic control shall be removed.

(d)All buildings, trailers, chain link fence, storage sheds, sanitary facilities
and other such items shall be removed from the worksite whenconstruction work is completed.

(e)

All utilities shall be removed from the site as required by the owner of theutility after construction work is completed.

(f)

The access road shall be bladed to be smooth and shall be left in a rut- freecondition. The road base/rock used on the access road shall remain in place
for use by the landowner and the CLO.

The item of work subsidiary to this bid item is Traffic Control as specified inConstruction Specification 9.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

8-4

Construction Specification 9—Traffic Control

1. Scope
The work shall consist of establishing traffic control and maintaining safe, convenient use of publicroads and rights-of-way.
2. Traffic and access
The contractor's operations shall cause no unnecessary inconvenience to the public. The public rightsof-way shall be maintained at all times unless interruption is authorized by proper local authority.
Contractor's authorized closing or detour plans shall be provided to the engineer for approval.
Safe and adequate access shall be provided and maintained to all public protection devices and to all
critical utility control locations. Facility access shall be continuous and unobstructed unless otherwise
approved.

3. Storage of equipment and material in public streets
Construction materials and equipment shall not be stored or parked on public streets, roads, or highways. During any material or equipment loading or unloading activities that may temporarily interferewith traffic, an acceptable detour shall be provided for the duration of the activity. Any associated expense for this activity is the responsibility of the contractor.
Excavated material, including suitable material that is intended for adjacent trench backfill or otherearth backfill as specified in section 5 of this specification, shall not be stored on public streets, roads, or
highways that remain in service for the public. Any waiver of this requirement must be obtained from theproper local authority and approved by the engineer. All excess and unsuitable material shall be removed from the site as soon as possible. Any spillage shall be removed from roadways before they areused by the public.

4. Street closures, detours, and barricades
The contractor shall comply with the requirements of all applicable responsible units of government forclosure of any street, road, or highway. The contractor shall provide the required barriers, guards, lights,
signs, temporary bridges, and flaggers together with informing the public of any detours and construction hazards by the most suitable means available, such as local newspapers or radio stations. The contractor is also responsible for compliance with additional public safety requirements that may arise
during construction. The contractor shall furnish, install, and, upon completion of the work, promptly
remove all signs, warning devices, and other materials used in the performance of this work.
Unless otherwise specified, the contractor shall notify, in writing, the fire chief, police chief, county
sheriff, state patrol, schools that operate school buses, or any other government official as may be appropriate no less than 7 days before closing, partly closing, or reopening any street, road, or highway.
Unless otherwise specified, the contractor shall furnish to the engineer a written plan showing the proposed method of signing, barricading for traffic control, and safety for street detours and closures.
All temporary detours will be maintained to ensure use of public rights-of-way is provided in a safe manner. This may include dust control, grading, and graveling as required in section 7 of this specification.

(210-VI-NEH, May 2001)

9–1

5. General and specific references
All signs, signals, barricades, use of flaggers, and other traffic control and public safety devices shallconform to the general requirements set forth in the Manual of Uniform Traffic Control Devices(MUTCD) and the latest edition of Standard Highway Signs and Standard Alphabets for Highway
Signs and/or OSHA Construction Industry Standards (29 CFR Part 1926), Subpart G, Signs, Signals,
and Barricades unless otherwise specified in section 7 of this specification.
6. Measurement and payment
For items of work for which specific lump sum prices are established in the contract, payment for thework is made at the contract lump sum price. Progress payments will be made based upon the percentage of estimated total time that traffic control will be required unless otherwise specified in section 7 ofthis specification. Payment will constitute full compensation for all flaggers, labor, materials, equipment,
and all other items necessary and incidental to completion of the work.
Compensation for any item of work described in the contract, but not listed in the bid schedule will be
included in the payment for the item of work to which it is made subsidiary. Such items and items towhich they are made subsidiary are identified in section 7 of this specification.

7. Items of work and construction details

9–2(210-VI-NEH, May 2001)

7. Items of Work and Construction Details
In Section 4, Street closures, detours, and barricades, the Contractor shall furnish a written planshowing the proposed method of signing, barricading for traffic control, use of flaggers, etc. to beapproved by the appropriate governmental authority, as well as this contract’s Engineer.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Subsidiary Item, Traffic Control(1)This item shall consist of performing all items of work for traffic control as
required by Sections 1 and 2 of this specification.

(2)

Separate payment will not be made for this item of work. Compensation for thisitem will be included in the payment for the bid item Mobilization and
Demobilization.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

9-3

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

9-4

Construction Specification 11—Removal of Water
1. Scope
The work consists of the removal of surface water and ground water as necessary to perform the construction
required by the contract in accordance with the specifications. It shall include: (1) constructing, installing, building, and maintaining all necessary temporary water containment facilities, channels, and diversions; (2) furnishing,
installing, and operating all necessary pumps, piping, and other facilities and equipment; and (3) removing all such
temporary works and equipment after their intended function is no longer required.
2. Diverting surface water
The contractor shall install, maintain, and operate all cofferdams, channels, flumes, sumps, and all other temporary diversion and protective works needed to divert streamflow and other surface water through or around theconstruction site. Control of surface water shall be continuous during the period that damage to construction work
could occur. Unless otherwise specified and/or approved, the diversion outlet shall be into the same drainagewaythat the water would have reached before being diverted.
The contractor shall furnish the contracting officer, in writing, a proposed plan for diverting surface water before
beginning any construction activities for which a diversion is required, unless waived in section 8 of this specification. Acceptance of this plan or the waiving of the plan requirement will not relieve the contractor of the responsibilities related to this activity during the process of completing the work as specified.

3. Dewatering the construction site
Foundations, cutoff trenches, and all other parts of the construction site shall be dewatered and kept free of standing water and muddy conditions as necessary for the proper execution of the work. The contractor shall furnish,install, operate, and maintain all drains, sumps, pumps, casings, well points, and all other equipment required toproperly dewater the site as specified. Dewatering systems that cause a loss of soil fines from the foundation areas
will not be permitted.
The contractor shall furnish the contracting officer, in writing, a proposed plan for dewatering before commencing
with any construction activity for which dewatering may be required, unless waived in section 8 of this specification. Acceptance of this plan or the waiving of the plan requirement will not relieve the contractor of the responsibilities for completing the specified work.

4. Dewatering borrow areas
The contractor shall maintain all borrow areas free of surface water or otherwise provide for timely and effective
removal of surface and subsurface water that accumulates within the borrow area, unless waived in section 8 ofthis specification. Borrow material shall be processed as necessary to achieve proper and uniform moisture content at the time of placement.
If pumping to dewater borrow areas is included as a bid item of work in the bid schedule, each pump discharge
pipe shall be equipped with a water meter. The meter shall be such that the measured quantity of water is accurate
within 3 percent of the true quantity. The contractor shall provide necessary support to perform accuracy tests of
the water meter when requested by the contracting officer.

5. Erosion and pollution control
Removal of water from the construction site, including the borrow areas, shall be accomplished so that erosion
and the transporting of sediment and other pollutants are minimized. Dewatering activities shall be accomplishedin a manner that the water table water quality is not altered. Pollution control activities shall not conflict with therequirements of Construction Specification 5, Pollution Control, if it is a part of this contract.

(210–VI–NEH, May 2001)

11–1

6. Removal of temporary works
When temporary works are no longer needed, the contractor shall remove and return the area to a condition
similar to that which existed before construction. Areas where temporary works were located shall be graded forsightly appearance with no obstruction to natural surface waterflows or the proper functioning and access to theworks of improvement installed. The contractor shall exercise extreme care during the removal stages to minimize
the loss of soil sediment and debris that was trapped during construction.
Pipes, casings, and any other material used to dewater the site shall be removed from temporary wells. The wells
shall be filled to ground level with clean gravel or other suitable material approved by the contracting officer. The
contractor shall exercise extreme care to prevent pollution of the ground water by these actions.

7. Measurement and payment
Method 1—Items of work listed in the bid schedule for removal of water, diverting surface water, and dewatering
construction sites and borrow areas are paid for at the contract lump sum prices. Such payment will constitute fullcompensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of thework.
Method 2—Items of work listed in the bid schedule for removal of water, diverting surface water, dewatering
construction sites, and dewatering borrow areas are paid for at the contract lump sum prices. Such payment will
constitute full compensation for furnishing, installing, operating, and maintaining the necessary trenches, drains,
sumps, pumps, and piping and for all labor, equipment, tools, and all other items necessary and incidental to thecompletion of the work. The exception is that additional payment for pumping to dewater borrow areas and theremoval of water will be made as described in the following paragraph.
If pumping to dewater borrow areas is a contract bid item, payment is made at the contract unit price, which shallbe the price per 1,000 gallons shown in the bid schedule. Such payment will constitute full compensation for pumping only. Compensation for equipment and preparation and for other costs associated with pumping is included in
the lump sum payment for removal of water or the lump sum payment for dewatering the borrow areas. Payment ismade only for pumping that is necessary to dewater borrow areas that cannot be effectively drained by gravity orthat must have the water table lowered to be usable as a suitable borrow source. Pumping for other purposes will
not be included for payment under this item.
All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed in the bid schedule is included in the payment for the contract
line item to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified
in section 8 of this specification.

8.

11–2

Items of work and construction details(210–VI–NEH, May 2001)

8. Items of Work and Construction Details
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 11, Removal of Water(1)

This item shall consist of all operations necessary to accomplish the work definedin Section 1 of this specification, including that work required to control waterfrom entering the new principal spillway.

(2)

The new principal spillway conduit installation area shall be protected from theentry of water from the reservoir until the dam is reconstructed to the full design
cross-section over the conduit. Water will not be permitted to enter the newprincipal spillway conduit until the new principal spillway system, including inlet,
conduit, impact basin, and outlet channel are constructed and fully operational.

(3)

A coffer dam shall be required to prevent transport of sediment from the reservoir
and to protect the new principal spillway and RCC chute structure from reservoir
water. The Contractor is responsible for designing the coffer dam complete withplans and specification which are signed and sealed by a Professional Engineer
licensed in Texas. The minimum level of protection for water containment during
construction shall be the 100-year storm event. The plans shall be submitted to theEngineer prior to start of construction operations.

(4)

Written sealed plans and specifications for diverting surface waters and for
dewatering the site are required. The Contractor’s plans for diverting surface waters
and dewatering the site shall be submitted to the Engineer prior to the start ofconstruction operations. Use of a well-point system for dewatering the site shall be
acceptable so long as the well-point system is designed and sealed by aProfessional Engineer licensed in Texas.

(5)

Within the scope of this item, the Contractor shall provide reasonable dewatering
capacity sufficient to maintain a water level which allows excavation in the borrow
area to the grades specified on the drawings during periods of low flow. Additional
dewatering capacity to draw the water level down to this level within 10 days shallbe provided in the event of flooding which inundates the borrow area.

(6)

(a)

Other than dewatering operations, additional equipment operations for thesole purpose of reducing the moisture content of materials in the borrow
areas, may be required by the Engineer in the event that dewatering
operations are not adequately reducing the moisture content of materials inthe borrow area.

(b)

When accumulations of water in the borrow areas prevent the excavation,
borrow operations from these areas will be suspended until suitableconditions again prevail.

Excavation for the installation of the RCC chute, concrete outlet structure, and rockriprap lined outlet shall be kept free of water during placement of RCC, concrete,rock, and/or backfilling. The water table at a concrete structure location shall be

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

11-3

kept 2 feet below the subgrade of the concrete during and for a minimum of sevendays after concrete placement or until backfilling around the structure is complete,
whichever is longer. The water table at a backfill or rock riprap location shall bemaintained a minimum of 2 feet below the backfill/rock riprap surface until
completion of fill placement activities in the area.
(7)

In Section 7, Measurement and payment, Method 1 shall apply. Payment will bemade prorated into monthly amounts based on length of contract period.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

11-4

Construction Specification 21—Excavation
1. Scope
The work shall consist of the excavation required by the drawings and specifications and disposal of the excavatedmaterials.
2. Classification
Excavation is classified as common excavation, rock excavation, or unclassified excavation in accordance with thefollowing definitions or is designated as unclassified.
Common excavation is defined as the excavation of all materials that can be excavated, transported, and unloaded
using heavy ripping equipment and wheel tractor-scrapers with pusher tractors or that can be excavated anddumped into place or loaded onto hauling equipment by excavators having a rated capacity of one cubic yard or
larger and equipped with attachments (shovel, bucket, backhoe, dragline, or clam shell) appropriate to the material
type, character, and nature of the materials.
Rock excavation is defined as the excavation of all hard, compacted, or cemented materials that require blastingor the use of ripping and excavating equipment larger than defined for common excavation. The excavation andremoval of isolated boulders or rock fragments larger than 1 cubic yard encountered in materials otherwise conforming to the definition of common excavation shall be classified as rock excavation. The presence of isolatedboulders or rock fragments larger than 1 cubic yard is not in itself sufficient cause to change the classification of
the surrounding material.
For the purpose of these classifications, the following definitions shall apply:
Heavy ripping equipment is a rear-mounted, heavy duty, single-tooth, ripping attachment mounted on a track typetractor having a power rating of at least 250 flywheel horsepower unless otherwise specified in section 10.
Wheel tractor-scraper is a self-loading (not elevating) and unloading scraper having a struck bowl capacity of atleast 12 cubic yards.
Pusher tractor is a track type tractor having a power rating of at least 250 flywheel horsepower equipped with appropriate attachments.
Unclassified excavation is defined as the excavation of all materials encountered, including rock materials, regardless of their nature or the manner in which they are removed.

3. Unclassified excavation
Excavation designated as unclassified excavation shall include all materials encountered regardless of their natureor the manner in which they are removed. When excavation is unclassified, none of the definitions or classifications
stated in Section 2, Classification, shall apply.
4. Blasting
The transportation, handling, storage, and use of dynamite and other explosives shall be directed and supervised
by a person(s) of proven experience and ability who is authorized and qualified to conduct blasting operations.
Blasting shall be done in a manner as to prevent damage to the work or unnecessary fracturing of the underlying
rock materials and shall conform to any special requirements in section 10 of this specification. When specified in
section 10, the contractor shall furnish the engineer, in writing, a blasting plan before blasting operations begin.

(210–VI–NEH, May 2001)

21–1

5. Use of excavated material
Method 1—To the extent they are needed, all suitable material from the specified excavations shall be used in theconstruction of required permanent earthfill or rockfill. The suitability of material for specific purposes is determined by the engineer. The contractor shall not waste or otherwise dispose of suitable excavated material.
Method 2—Suitable material from the specified excavations may be used in the construction of required earthfill or
rockfill. The suitability of material for specific purposes is determined by the engineer.

6. Disposal of waste materials
Method 1—All surplus or unsuitable excavated materials are designated as waste and shall be disposed of at thelocations shown on the drawings.
Method 2—All surplus or unsuitable excavated materials are designated as waste and shall be disposed of by thecontractor at sites of his own choosing away from the site of the work. The disposal shall be in an environmentally
acceptable manner that does not violate local rules and regulations.

7. Excavation limits
Excavations shall comply with OSHA Construction Industry Standards (29CFR Part 1926) Subpart P, Excavations,
Trenching, and Shoring. All excavations shall be completed and maintained in a safe and stable condition throughout the total construction phase. Structure and trench excavations shall be completed to the specified elevations
and to the length and width required to safely install, adjust, and remove any forms, bracing, or supports necessary
for the installation of the work. Excavations outside the lines and limits shown on the drawings or specified hereinrequired to meet safety requirements shall be the responsibility of the contractor in constructing and maintaining asafe and stable excavation.
8. Borrow excavation
When the quantities of suitable material obtained from specified excavations are insufficient to construct the specified earthfills and earth backfills, additional material shall be obtained from the designated borrow areas. The
extent and depth of borrow pits within the limits of the designated borrow areas shall be as specified in section 10
or as approved by the engineer.
Borrow pits shall be excavated and finally dressed to blend with the existing topography and sloped to prevent
ponding and to provide drainage.

9. Overexcavation
Excavation in rock beyond the specified lines and grades shall be corrected by filling the resulting voids withportland cement concrete made of materials and mix proportions approved by the engineer. Concrete that will be
exposed to the atmosphere when construction is completed shall meet the requirements of concrete selected foruse under Construction Specification 31, Concrete for Major Structures, or 32, Structure Concrete, as appropriate.
Concrete that will be permanently covered shall contain not less than five bags of cement per cubic yard. The concrete shall be placed and cured as specified by the engineer.
Excavation in earth beyond the specified lines and grades shall be corrected by filling the resulting voids with approved, compacted earthfill. The exception to this is that if the earth is to become the subgrade for riprap, rockfill,sand or gravel bedding, or drainfill, the voids may be filled with material conforming to the specifications for theriprap, rockfill, bedding, or drainfill. Before correcting an overexcavation condition, the contractor shall review theplanned corrective action with the engineer and obtain approval of the corrective measures.

21–2(210–VI–NEH, May 2001)

9. Measurement and payment
For items of work for which specific unit prices are established in the contract, the volume of each type and classof excavation within the specified pay limits is measured and computed to the nearest cubic yard by the method of
average cross-sectional end areas or by methods outlined in section 10 of this specification. Regardless of quantities excavated, the measurement for payment is made to the specified pay limits except that excavation outside thespecified lines and grades directed by the engineer to remove unsuitable material is included. Excavation required
because unsuitable conditions result from the contractor's improper construction operations, as determined by theengineer, is not included for measurement and payment.
Method 1—The pay limits shall be as designated on the drawings.
Method 2—The pay limits shall be defined as follows:a. The upper limit shall be the original ground surface as it existed before the start of construction operations
except that where excavation is performed within areas designated for previous excavation or earthfill, theupper limit shall be the modified ground surface resulting from the specified previous excavation or earthfill.
b. The lower and lateral limits shall be the neat lines and grades shown on the drawings.
Method 3 —The pay limits shall be defined as follows:a. The upper limit shall be the original ground surface as it existed before the start of construction operations
except that where excavation is performed within areas designated for previous excavation or earthfill, theupper limit shall be the modified ground surface resulting from the specified previous excavation or earthfill.
b. The lower and lateral limits shall be the true surface of the completed excavation as directed by the engineer.
Method 4—The pay limits shall be defined as follows:a. The upper limit shall be the original ground surface as it existed before the start of construction operations
except that where excavation is performed within areas designated for previous excavation or earthfill, theupper limit shall be the modified ground surface resulting from the specified previous excavation or earthfill.
b. The lower limit shall be at the bottom surface of the proposed structure.
c. The lateral limits shall be 18 inches outside of the outside surface of the proposed structure or shall be vertical planes 18 inches outside of and parallel to the footings, whichever gives the larger pay quantity, except
as provided in d below.
d. For trapezoidal channel linings or similar structures that are to be supported upon the sides of the excavation without intervening forms, the lateral limits shall be at the underside of the proposed lining or structure.
e. For the purposes of the definitions in b, c, and d, above, any specified bedding or drainfill directly beneathor beside the structure will be considered to be a part of the structure.
All methods—The following provisions apply to all methods of measurement and payment.
Payment for each type and class of excavation is made at the contract unit price for that type and class of excavation. Such payment will constitute full compensation for all labor, materials, equipment, and all other items necessary and incidental to the performance of the work except that extra payment for backfilling overexcavation will
be made in accordance with the following provisions.

(210–VI–NEH, May 2001)

21–3

Payment for backfilling overexcavation, as specified in section 8 of this specification, is made only if the excavation
outside specified lines and grades is directed by the engineer to remove unsuitable material and if the unsuitablecondition is not a result of the contractor's improper construction operations as determined by the engineer.
Compensation for any item of work described in the contract, but not listed in the bid schedule is included in thepayment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 10 of this specification.

10. Items of work and construction details

21–4(210–VI–NEH, May 2001)

10. Items of Work and Construction Details
In Section 5, Use of excavated material, Method 1 shall apply. There is no guarantee thatmaterials obtained from the specified excavations may be used directly in specified fill areas.
Separate stockpiling of selected materials, based on their engineering properties, to ensure theiravailability for use in specific zones of fill areas may be required. Stockpiling shall be conducted
on areas shown on the construction drawings or as approved by the Engineer. Additional
compensation will not be made for stockpiling of excavated materials. Cost for stockpiling of
excavated materials shall be included in the compensation for the bid item(s) for excavation.
In Section 6, Disposal of waste materials, Method 1 shall apply. The disposal of the excavatedmaterials shall include transporting, depositing, and spreading the materials to and on thedesignated waste areas as shown on the drawings or as approved by the Engineer. The finishedsurface of the waste area(s) shall be uniform and conform to the topography. Additional
compensation for disposal of excavated materials and dressing of the surface of waste areas will
not be made. Costs will be included in the compensation for the bid item for excavation.
In Section 7, Excavation limits, a qualified Representative of the Engineer will inspect all
exposed subgrade surfaces upon which structures, drainfill, or embankment fill will be placed.
The Representative shall conduct visual inspection and/or testing to confirm the subgrade issuitable for the intended design purpose, and if necessary, will direct the Contractor to perform
additional overexcavation and replacement if conditions warrant. The Contractor shall facilitate
access to subgrade areas and assist the Representative as necessary during the inspection. The
Contractor shall be prepared to provide an excavator and operator to perform test excavations at
the direction of the Representative, if requested, and provide heavy equipment to conduct proof
rolling operations as required. Proof rolling will be performed in accordance with Item 216,
"Proof Rolling” of the Texas Department of Transportation Standard Specifications forConstruction and Maintenance of Highways, Streets, and Bridges (2014).
In Section 9, Measurement and payment, Method 3 shall apply. The neat lines and grades shownon the drawings shall be considered the true surface of the completed excavation unless otherwise
approved by the Engineer. After the limits of excavation shown on the drawings are complete, theEngineer will examine the completed surface and mark areas that need additional excavation toremove low density or unsuitable materials. The actual depths and extent of these excavations
will be determined after examination of materials encountered.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 12, Excavation, Common(1)This item shall consist of all excavation required for reconstruction of theembankment, including all wet excavation along the upstream slope and inlet
channel; and installation of the new principal spillway riser, 42-inch I.D. principal
spillway pipe, principal spillway impact basin, RCC spillway, rock riprap lined
principal spillway and auxiliary spillway outlet, and outlet channels as shown on
the drawings.

(2)

Prior to performing designated excavations, the ground surface shall be stripped ofvegetation and topsoil. The depth of this stripping shall be sufficient to remove soil
containing significant vegetative or organic matter. The depth of stripping is

NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

21-5

estimated to be 12 inches, on average. The upper limit for pay limit determination(Method 3) shall be the ground surface as it exists prior to stripping the surface
vegetation and topsoil.
(3)

Suitable materials resulting from the required excavations shall be used to construct
the specified fills except materials suitable for topsoil shall be stockpiled at thelocation designated by the Engineer. Unsuitable materials shall be placed in thewaste area shown on the drawings.

(4)

Items of work subsidiary to this bid item are:(a)

Excavation, Common, Foundation Stripping as specified in Section 10.b.
of this specification as it applies to this bid item.

b. Subsidiary Item, Excavation, Common, Foundation Stripping(1)

This item shall consist of removing weeds, grass, roots and soils containing
significant vegetative or organic material from the ground surface (including any
waste areas) prior to placing earthfill in required areas. The depth of stripping shallbe sufficient to remove the vegetative material and soil containing significant
organic matter and is estimated to be 6 to 12 inches (on average). The total required
volume of stripping shall not exceed that obtained by assuming a depth of 12
inches.

(2)

Separate payment will not be made for this item. Compensation for this item will
be included in the payment for the respective bid item for Excavation, Common.

c. Subsidiary Item, Excavation Common, Borrow(1)

This item shall consist of all excavation from within the borrow areas required tocomplete the specified earthfills as designated on the drawings.

(2)

All excavated slopes within the limits of borrow areas shall be maintained to be no
steeper than five horizontal to one vertical.

(3)

All borrow areas shall be maintained to provide positive drainage to natural andconstructed drainage ways. Dressing and grading of borrow areas to accomplish
this drainage shall be accomplished as borrow excavation progresses. Additional
compensation will not be made for this work as herein specified.

(4)

All borrow areas shall be maintained to be contiguous with no berms, ridges ormounds remaining that extend more than two feet above the lowest point inadjacent borrow areas. All berms, ridges, and mounds shall be removed to meetthis height limitation. Additional compensation will not be made for this work asherein specified.

(5)

Separate payment will not be made for this item. Compensation for this item will
be included in the payment for Bid Item 13, Earthfill (on-site borrow) (Types C, D,E); and Bid Item 20, Lime Treated Earthfill (Types F, G).

d. Subsidiary Item, Excavation, Common, Drainfill, Fine Filter
NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

21-6

(1)

This item includes all excavation, outside the limits of other designated excavation,required for the installation of the drainage systems as shown on the drawings
including the toe drain access trench excavation.

(2)

Separate payment will not be made for this item. Compensation for this item will
be included in the payment for the bid item for Drainfill, Fine Filter.

e. Subsidiary Item, Excavation, Common, Drainfill, Coarse Filter

f.

(1)

This item includes all excavation, outside the limits of other designated excavation,required for the installation of the drainage systems as shown on the drawings.

(2)

Separate payment will not be made for this item. Compensation for this item will
be included in the payment for the bid item for Drainfill, Coarse Filter.

Subsidiary Item, Excavation, Common, Concrete Structures(1)

This item includes all excavation, outside the limits of other designated excavation,required for the installation of the principal spillway system and appurtenances
including the principal spillway outlet structure.

(2)

Separate payment will not be made for this item. Compensation for this item will
be included in the payment for the respective bid items for Concrete, Structural andConcrete, Pipe Cradle, as appropriate.

g. Subsidiary Item, Excavation, Common, Flexbase(1)

This item shall consist of all excavation required for the installation of flexbase as
shown on the drawings.

(2)

Separate payment will not be made for this item. Compensation for this item will
be included in the payment for the respective bid item for Flexbase.

h. Subsidiary Item, Excavation, Common, Rock Riprap and Riprap Bedding

i.

(1)

This item shall consist of all excavation required for the installation of the rockriprap and riprap bedding as shown on the drawings.

(2)

Separate payment will not be made for this item. Compensation for this item will
be included in the payment for the respective bid items for Rock Riprap and Riprap
Bedding.

Subsidiary Item, Excavation, Common, Structure Removal(1)This item shall consist of all excavation required for removing the existing
principal spillway intake tower and portions of the existing principal spillway
conduit designated for removal, as shown on the drawings.

(2)

Separate payment will not be made for this item. Compensation for this item will
be included in the payment for the bid item for Structure Removal, Existing
Principal Spillway.

NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

21-7

NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

21-8

Chapter 2

National Standard Construction Specifications

Part 642 National Engineering Handbook

Construction Specification 23—Earthfill
1.

Scope

The work consists of the construction of earth embankments, other earthfills, and earth backfills required by the drawings andspecifications.
Earthfill is composed of natural earth materials that can be placed and compacted by construction equipment operated in aconventional manner.
Earth backfill is composed of natural earth material placed and compacted in confined spaces or adjacent to structures (including
pipes) by hand tamping, manually directed power tampers or vibrating plates, or their equivalent.

2.

Material

All fill material shall be obtained from required excavations and designated borrow areas. The selection, blending, routing, anddisposition of material in the various fills shall be subject to approval by the engineer.
Fill materials shall contain no frozen soil, sod, brush, roots, or other perishable material. Rock particles larger than the maximum size
specified for each type of fill shall be removed prior to compaction of the fill.
The types of material used in the various fills shall be as listed and described in the specifications and drawings.

3.

Foundation preparation

Foundations for earthfill shall be stripped to remove vegetation and other unsuitable material or shall be excavated as specified.
Except as otherwise specified, earth foundation surfaces shall be graded to remove surface irregularities and shall be scarified
parallel to the axis of the fill or otherwise acceptably scored and loosened to a minimum depth of 2 inches. The moisture content of
the loosened material shall be controlled as specified for the earthfill, and the surface material of the foundation shall be compacted
and bonded with the first layer of earthfill as specified for subsequent layers of earthfill.
Earth abutment surfaces shall be free of loose, uncompacted earth in excess of 2 inches in depth normal to the slope and shall be atsuch a moisture content that the earthfill can be compacted against them to produce a good bond between the fill and theabutments.
Rock foundation and abutment surfaces shall be cleared of all loose material by hand or other effective means and shall be free ofstanding water when fill is placed upon them. Occasional rock outcrops in earth foundations for earthfill, except in dams and otherstructures designed to restrain the movement of water, shall not require special treatment if they do not interfere with compactionof the foundation and initial layers of the fill or the bond between the foundation and the fill.
Foundation and abutment surfaces shall be no steeper than one horizontal to one vertical unless otherwise specified. Test pits orother cavities shall be filled with compacted earthfill conforming to the specifications for the earthfill to be placed upon thefoundation.

4.

Placement

Earthfill shall not be placed until the required excavation and foundation preparation have been completed and the foundation has
been inspected and approved by the engineer. Earthfill shall not be placed upon a frozen surface nor shall snow, ice, or frozenmaterial be incorporated in the earthfill matrix.
Earthfill shall be placed in approximately horizontal layers. The thickness of each layer before compaction shall not exceed the
maximum thickness specified in section 10 or shown on the drawings. Materials placed by dumping in piles or windrows shall be
spread uniformly to not more than the specified thickness before being compacted.

(210-VI-NEH, February 2020)

23–1

Chapter 2

National Standard Construction Specifications

Part 642 National Engineering Handbook

Hand compacted earth backfill shall be placed in layers whose thickness before compaction does not exceed the maximum thickness
specified for layers of earth backfill compacted by manually directed power tampers.
Earth backfill shall be placed in a manner that prevents damage to the structures and allows the structures to assume the loads fromthe earth backfill gradually and uniformly. The height of the earth backfill adjacent to a structure shall be increased at approximately
the same rate on all sides of the structure.
Earthfill and earth backfill in dams, levees, and other structures designed to restrain the movement of water shall be placed to meetthe following additional requirements:(a) The distribution of materials throughout each zone shall be essentially uniform, and the earthfill shall be free from lenses,
pockets, streaks, or layers of material differing substantially in texture, moisture content, or gradation from thesurrounding material. Zone earthfills shall be constructed concurrently unless otherwise specified.
(b)

The surface of each layer shall be scarified parallel to the axis of the fill to a depth of not less than 2 inches before thenext layer is placed.

(c)

The top surface of embankments shall be maintained approximately level during construction with two exceptions: A
crown or cross-slope of about 2 percent shall be maintained to ensure effective drainage, or as otherwise specified fordrainfill or sectional zones.

(d)

Dam embankments shall be constructed in continuous layers from abutment to abutment except where openings tofacilitate construction or to allow the passage of streamflow during construction are specifically authorized in thecontract.

(e)

Embankments built at different levels as described under (c) or (d) above shall be constructed so that the slope of thebonding surfaces between embankment in place and embankment to be placed is not steeper than 3 feet horizontal to 1
foot vertical. The bonding surface of the embankment in place shall be stripped of all material not meeting therequirements of this specification and shall be scarified, moistened, and recompacted when the new earthfill is placed
against it. This ensures a good bond with the new earthfill and obtains the specified moisture content and density at thecontact of the inplace and new earthfills.

5.

Control of moisture content

During placement and compaction of earthfill and earth backfill, the moisture content of the material being placed shall bemaintained within the specified range.
The application of water to the earthfill material shall be accomplished at the borrow areas insofar as practicable. Water may be
applied by sprinkling the material after placement on the earthfill, if necessary. Uniform moisture distribution shall be obtained by
disking.
Material that is too wet when deposited on the earthfill shall either be removed or be dried to the specified moisture content prior
to compaction.
If the top surface of the preceding layer of compacted earthfill or a foundation or abutment surface in the zone of contact with theearthfill becomes too dry to permit suitable bond, it shall either be removed or scarified and moistened by sprinkling to an
acceptable moisture content before placement of the next layer of earthfill.

6.

Compaction

Earthfill—Earthfill shall be compacted according to the following requirements for the class of compaction specified:Class A compaction—Each layer of earthfill shall be compacted as necessary to provide the density of the earthfill matrix notless than the minimum density specified in Section 10 or identified on the drawings. The earthfill matrix is defined as the
portion of the earthfill material finer than the maximum particle size allowed in the reference compaction test method
specified (ASTM D698 or ASTM D1557).
Class B compaction—Each layer of earthfill shall be compacted to a mass density not less than the minimum density specified.
23–2(210-VI-NEH, February 2020)

Chapter 2

National Standard Construction Specifications

Part 642 National Engineering Handbook

Class C compaction—Each layer of earthfill shall be compacted by the specified number of passes of the type and weight ofroller or other equipment specified or by an approved equivalent method. Each pass shall consist of at least one passage of theroller wheel or drum over the entire surface of the layer.
Earth backfill—Earth backfill adjacent to structures shall be compacted to a density equivalent to that of the surrounding inplaceearth material or adjacent required earthfill or earth backfill. Compaction shall be accomplished by hand tamping or manually
directed power tampers, plate vibrators, walk-behind, miniature, or self-propelled rollers. Unless otherwise specified heavyequipment including backhoe mounted power tampers or vibrating compactors and manually directed vibrating rollers shall not be
operated within 3 feet of any structure. Towed or self-propelled vibrating rollers shall not be operated within 5 feet of any structure.
Compaction by means of drop weights operating from a crane or hoist is not permitted.
The passage of heavy equipment will not be allowed:• Over cast-in-place conduits within 14-days after placement of the concrete• Over cradled or bedded precast conduits within 7 days after placement of the concrete cradle or bedding• Over any type of conduit until the backfill has been placed above the top surface of the structure to a height equal to onehalf the clear span width of the structure or pipe or 3 feet, whichever is greater, except as may be specified in section 10.
Compacting of earth backfill adjacent to structures shall not be started until the concrete has attained the strength specified in
section 10 for this purpose. The strength is determined by compression testing of test cylinders cast by the contractor's quality
control personnel for this purpose and cured at the work site in the manner specified in ASTM C 31 for determining when a structure
may be put into service.
When the required strength of the concrete is not specified as described above, compaction of earth backfill adjacent to structures
shall not be started until the following time intervals have elapsed after placement of the concrete.

Structure

Time interval(days)

Vertical or near-vertical walls with earth loading on one side only

14

Walls backfilled on both sides simultaneously

7

Conduits and spillway risers, cast-in-place (with inside forms in place)7

Conduits and spillway risers, cast-in-place (inside forms removed)

14

Conduits, pre-cast, cradled2

Conduits, pre-cast, bedded

1

Cantilever outlet bents (backfilled both sides simultaneously)

3

7.

Reworking or removal and replacement of defective earthfill

Earthfill placed at densities lower than the specified minimum density or at moisture contents outside the specified acceptable
range of moisture content or otherwise not conforming to the requirements of the specifications shall be reworked to meet therequirements or removed and replaced by acceptable earthfill. The replacement earthfill and the foundation, abutment, andearthfill surfaces upon which it is placed shall conform to all requirements of this specification for foundation preparation, approval,
placement, moisture control, and compaction.

(210-VI-NEH, February 2020)

23–3

Chapter 2

8.

National Standard Construction Specifications

Part 642 National Engineering Handbook

Testing

During the course of the work, the contractor shall perform quality control tests, as applicable, to identify earthfill and earth backfill
materials; determine the reference maximum density and optimum moisture content; and document that the moisture content ofmaterial at the time of compaction and the density of earthfill and earth backfill in place conform to the requirements of thisspecification.
Determining Reference Maximum Density and Optimum Moisture Content—For Class A compaction, the reference maximum density
and optimum moisture content shall be determined in accordance with the compaction test and method specified on the drawings
or in section 10.
Documenting Specification Conformance—In-place densities of earthfill and earth backfill requiring Class A compaction shall bemeasured in accordance with ASTM D1556, D2167, D2937, D6938 or D8167. Moisture contents of earthfill and earth backfill at thetime of compaction shall be measured in accordance with ASTM D2216, D4643, or D6938. Values of moisture content determinedby ASTM D2216 are considered the true value of the soil moisture. Values of moisture content determined by ASTM D4643 or
D6938 shall be verified by comparison to values obtained by ASTM D2216. Values of in-place density and moisture content
determined by these tests shall be compared to the minimum density and moisture content range specified on the drawings or in
section 10.
Correction for Oversize Particles—If the materials to be used for earthfill or earth backfill contain more than 5 percent by dry weightof oversize rock particles (particles larger than those allowed in the specified compaction test and method), corrections for oversize
particles shall be made using the appropriate procedures explained in ASTM D4718.

9.

Measurement and payment

For items of work for which specific unit prices are established in the contract, the volume of each type and compaction class ofearthfill and earth backfill within the specified zone boundaries and pay limits is measured and computed to the nearest cubic yard
by the method of average cross-sectional end areas. Unless otherwise specified in section 10, no deduction in volume is made for
embedded items, such as, but not limited to, conduits, inlet structures, outlet structures, embankment drains, sand diaphragm andoutlet, and their appurtenances.
The pay limits shall be as defined below, with the further provision that earthfill required to fill voids resulting from overexcavationof the foundation, outside the specified lines and grades, will be included in the measurement for payment only under the following
conditions:• Where such overexcavation is directed by the engineer to remove unsuitable material, and• Where the unsuitable condition is not a result of the contractor's improper construction operations as determined by theengineer.
Earthfill beyond the specified lines and grades to backfill excavation required for compliance with OSHA requirements will beconsidered subsidiary to the earthfill bid item(s).
Method 1—The pay limits shall be as designated on the drawings.
Method 2—The pay limits shall be the measured surface of the foundation when approved for placement of the earthfill and thespecified neat lines of the earthfill surface.
Method 3—The pay limits shall be the measured surface of the foundation when approved for placement of the earthfill and themeasured surface of the completed earthfill.
Method 4—The pay limits shall be the specified pay limits for excavation and the specified neat lines of the earthfill surface.
Method 5—The pay limits shall be the specified pay limits for excavation and the measured surface of the completed earthfill.

23–4(210-VI-NEH, February 2020)

Chapter 2

National Standard Construction Specifications

Part 642 National Engineering Handbook

Method 6—Payment for each type and compaction class of earthfill and earth backfill is made at the contract unit price for that typeand compaction class of earthfill. Such payment will constitute full compensation for all labor, material, equipment, and all otheritems necessary and incidental to the performance of the work.
Method 7—Payment for each type and compaction class of earthfill and earth backfill is made at the contract unit price for that typeand compaction class of earthfill. Such payment will constitute full compensation for all labor, material, equipment, and all otheritems necessary and incidental to the performance of the work except furnishing, transporting, and applying water to the foundationand earthfill material. Water applied to the foundation and earthfill material is measured and payment made as specified inConstruction Specification 10.
All methods—The following provisions apply to all methods of measurement and payment. Compensation for any item of work
described in the contract, but not listed in the bid schedule is included in the payment for the item of work to which it is madesubsidiary. Such items and the items to which they are made subsidiary are identified in section 10 of this specification.

10. Items of work and construction details(210-VI-NEH, February 2020)

23–5

10. Items of Work and Construction Details
In Section 2, the required fill material types and placement locations, material properties
specifications, and compaction criteria are shown on the drawings. A description of the intended
material borrow source locations and depths for each material type based on available laboratory
testing data is provided on the drawings as a guide to the Contractor, but the Contractor is
responsible for verifying the materials in each borrow source meet the material specifications foreach material type. Contractor-proposed alternative borrow sources for each material type aresubject to review and approval by the Engineer.
In Section 3, excavated subgrades shall be inspected as specified in Construction Specification
21, Excavation. Immediately prior to placement of the initial fill layer on earthen subgrade, thestripped subgrade shall be scarified to a depth of approximately 6 inches, moisture conditioned asnecessary to within 0 to +4% of optimum moisture according to ASTM D698, and shall becompacted to achieve a minimum relative compaction of 98% of maximum dry density under thefootprint of structures and a minimum of 95% of maximum dry density in all other areas per
ASTM D698.
All surfaces to receive fill shall be closely examined immediately prior to the placement of allearthfills and backfills. All materials that exhibit drying cracks, slaking, or other evidences ofbeing unstable or unsuitable, shall be removed or reworked by scarification, wetting, andcompaction to the affected depths prior to the placement of fill. Additional compensation will not
be made for removing or reworking the foundation or fill materials to meet the requirements
herein specified.
Where embankment fill is placed against excavated and constructed slopes which have a gradientequal to or steeper than 5 horizontal to 1 vertical (5H:1V), the slope shall be benched such thatthe vertical height of each bench shall be approximately 1 foot with a horizontal width of no lessthan 2 feet. Benching shall extend beyond the limits of previously completed foundation
excavation. The benched material shall receive the same compaction effort as the lift of fill that isplaced adjacent to each bench. Density testing of the benches will not be required when benching
into natural slopes or previously constructed slopes which have already been tested for thisProject. Natural slopes between 5H:1V and 10H:1V shall be raised horizontally. Temporary
slopes shall conform to OSHA requirements.
In Section 4, after being deposited on the prepared subgrade, each lift of fill material shall be
spread, bladed and smoothed to the extent necessary to ensure that the surface is free of abrupt
mounds, depressions or windrows to provide a smooth uniform surface for operation of plowing
and compaction equipment.
Each lift of fill material shall then be disked, bladed, and plowed to an acceptable degree anddepth so as to thoroughly loosen, blend, and bond the material with the preceding lift before
compaction is started.
The minimum disk blade size shall be 34 inches in diameter. An increase in the weight of theplow; an increase in disc size; a decrease in thickness of lifts being placed, or any combination ofthese may be required to accomplish the blending and bonding herein specified.

NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

23-6

The maximum layer thickness shall be 9 inches before compaction when compacted by heavyequipment, or 4 inches before compaction when compacted with manually-operated equipment.
The maximum allowable compacted particle size shall be as shown on the drawings. Backfill
adjacent to concrete works shall not contain particles larger than 1 inch in diameter.
In Section 5, the in-place moisture content of previously compacted earthfills shall be maintained
within the specified range until covered by subsequent lifts of fill and/or structures.
In Section 6, earthfill shall be compacted with kneading-type equipment capable of producing ahomogenous compacted fill with good inter-lift bonding and free from adverse preferential
planes.
In Section 8, borrow source material properties testing and in-place moisture and density testing
on compacted earthfill shall be performed as indicated in Construction Specification 94,
Contractor Quality Control.
In Section 9, Measurement and payment, Method 4 and 6 shall apply.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 13, Earthfill, On-site Borrow (Material Types C, D, and E)(1)This item shall consist of all fill and backfill necessary for the completion of theexterior zone of the embankment (Material Type C); interior zone of theembankment (Material Type D); and the berms for the RCC Spillway outlet
channel, backfill for the existing principal spillway plunge pool and downstream
channel to be abandoned, and other backfill areas located away from the dam(Material E) as shown on the drawings.

(2)

In Section 6, Compaction, Class A compaction shall apply. In-place dry density ofmaterials being placed shall not be less than specified on the drawings. The
moisture content at the time of placement and compaction shall be adjusted asnecessary to meet the requirements shown on the drawings.

(3)

The subgrade on which earthfill is to be placed that has not had previous
excavation performed shall be properly prepared as outlined in Section 3 of thisspecification.

(4)

The Item of work subsidiary to this bid item is Excavation, Common, Borrow, as
specified in Construction Specification 21.

(5)

In the event available on-site sources of untreated earthfill meeting the projectmaterial specifications for Material Type C become depleted, the contract will be
modified in writing to utilize Material Type H (definitions on drawings Sheet 10)
as needed to construct the exterior zone of embankment. Material Type H will be
lime treated earthfill from on-site sources that will have the same specifications as
those for Bid Item 20, Lime Treated Earthfill (Material Types F and G) and Bid
Item 21, Furnishing and Handling Lime.

NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

23-7

b. Bid Item 14, Earthfill, Imported Borrow (Material Types A and B)(1)

This item shall consist of all fill and backfill necessary for the completion of theembankment adjacent to the RCC Spillway (Material Type A) and under the RCC
Spillway (Material Type B) as shown on the drawings. This item shall include allcosts required to verify that material meets specifications and to supply material tothe project site.

(2)

In Section 6, Compaction, Class A compaction shall apply. In-place dry density ofmaterials being placed shall not be less than specified on the drawings. The
moisture content at the time of placement and compaction shall be adjusted asnecessary to meet the requirements shown on the drawings.

(3)

The subgrade on which earthfill is to be placed that has not had previous
excavation performed shall be properly prepared as outlined in Section 3 of thisspecification.

NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

23-8

Construction Specification 24—Drainfill
1. Scope
The work consists of furnishing, placing, and compacting drainfill required in the construction of structure drainage systems.
2. Material
Method 1—Drainfill material shall conform to the requirements of Material Specification 521, Aggregates for
Drainfill and Filters. A minimum of 30 days before delivery of materials to the site, the contractor shall inform theengineer in writing of the source(s) from which drainfill material will be obtained. The contractor shall provide theengineer free access to the source(s) for the purpose of obtaining samples for testing.
Method 2—Drainfill material shall be sand, gravel, or crushed stone, or mixtures thereof, obtained from the specified sources. The material shall be selected as necessary to avoid the inclusion of organic matter, clay balls, excessive fine particles, or other substances that would interfere with their free-draining properties.

3. Base preparation
Foundation surface and trenches shall be clean and free of organic matter, loose soil, foreign substance, and standing water when the drainfill is placed. Earth surfaces upon or against which drainfill will be placed shall not be
scarified.
4. Placement
Drainfill shall not be placed until the subgrade has been inspected and approved by the engineer. Drainfill shall not
be placed over or around pipe or drain tile until the installation of the pipe or tile has been inspected and approved.
Drainfill shall be placed uniformly in layers not to exceed 12 inches thick before compaction. When compaction isaccomplished by manually controlled equipment, the layers shall not exceed 8 inches thick. The material shall beplaced to avoid segregation of particle sizes and to ensure the continuity and integrity of all zones. No foreign material shall be allowed to become intermixed with or otherwise contaminate the drainfill.
Traffic shall not be permitted to cross over drains at random. Equipment cross-overs shall be maintained, and thenumber and location of such crossovers shall be established and approved before the beginning of drainfill placement. Each crossover shall be cleaned of all contaminating material and shall be inspected and approved by theengineer before the placement of additional drainfill material.
Any damage to the foundation surface or the trench sides or bottom occurring during placement of drainfill shall be
repaired before drainfill placement is continued.
The upper surface of drainfill constructed concurrently with adjacent zones of earthfill shall be maintained at aminimum elevation of 1 foot above the upper surface of adjacent earthfill.
Drainfill over and/or around pipe or drain tile shall be placed to avoid any displacement in line or grade of the pipeor tile.
Drainfill shall not be placed adjacent to structures until the concrete has attained the strength specified in section
9 of this specification. The strength shall be determined by compression testing of concrete test cylinders cast(210–VI–NEH, May 2001)

24–1

and field cured at the project site in accordance with ASTM Method C 31 for determining when a structure may beplaced into service.
When the required strength of the concrete is not specified as described above, placement of drainfill adjacent toconcrete structures shall not be commenced until the following item intervals have elapsed following placement of
the concrete:
Structure typeTime interval (days)

Vertical or near-vertical wall with earth loading on one side only
(retaining walls and counterforts)

14

Walls backfilled on both sides simultaneously

7

Conduits and galleries, cast-in-place(with inside forms in place)(inside forms removed)

7
14

Conduits, precast, cradled2

Conduits, precast, bedded

1

Cantilever outlet bents backfilled on both sides simultaneously

3

5. Control of moisture
The moisture content of drainfill material shall be controlled as specified in section 9 of this specification. When
additional water is required, it shall be applied in a manner to avoid excessive wetting to adjacent earthfill. Except
as specified in section 9 of this specification, control of moisture content will not be required.
6. Compaction
Drainfill shall be compacted according to the following requirements for the class of compaction specified:Class A compaction—For drainfill materials with more than 70 percent passing the 3/4 inch sieve, each layerof drainfill shall be compacted to a minimum dry density of not less than the density specified in section 9 of thisspecification as determined by ASTM D 698. For drainfill materials with 70 percent or less passing the 3/4 inchsieve, each layer of drainfill shall be compacted to a relative density of not less than 70 percent as determined by
ASTM D 4254.
Class I compaction—Each layer of drainfill shall be compacted by a minimum of two passes over the entire
surface with a steel-drum vibrating roller weighing at least 5 tons and exerting a vertical vibrating force of not lessthan 20,000 pounds at a minimum frequency of 1,200 times per minute, or by an approved equivalent method.
Class II compaction—Each layer of drainfill shall be compacted by one of the following methods or by an approved equivalent method. (A pass is defined as at least one complete coverage of the roller wheel, tire, or drum
over the entire surface for each layer.)a. A minimum of two passes over the entire surface with a pneumatic-tired roller exerting a minimum pressureof 75 pounds per square inch.
b. A minimum of four passes over the entire surface with the track of a crawler-type tractor weighing at least
20 tons.
c. Controlled movement of the hauling equipment so that the entire surface is traversed by not less than one
tread track of the loaded hauling equipment.

24–2(210–VI–NEH, May 2001)

Class III compaction—No compaction will be required beyond that resulting from the placing and spreading
operations.
When compaction other than Class III compaction is specified, material placed in trenches or other locations inaccessible to heavy equipment shall be compacted by manually controlled pneumatic or vibrating tampers as specified in section 9 of this specification.
Heavy equipment shall not be operated within 2 feet of any structure. Vibrating rollers shall not be operated within
5 feet of any structure. Compaction by means of drop weights operating from cranes, hoists, or similar equipment
will not be permitted.

7. Testing
The contractor shall conduct such tests as necessary to verify that the drainfill material and the inplace drainfill
meets the specification requirements.
The engineer shall be granted access to perform such tests as are required to verify that the drainfill materials
and the drainfill in place meets the requirements of the specifications. These tests are not intended to provide thecontractor with information needed to assure that the materials and workmanship meet the specification requirements. These verification tests will not relieve the contractor of the responsibility of performing required tests forthat purpose.

8. Measurement and payment
Method 1—For items of work for which specific unit prices are established in the contract, the volume of drainfill within the neat lines shown on the drawings are measured and computed to the nearest cubic yard. Where theengineer directs placement of drainfill outside the neat lines to replace unsuitable foundation material, the volume
of such drainfill is included. The volume included is only to the extent that the unsuitable condition is not a resultof the contractor's improper construction operation in the determination of the engineer.
Payment for drainfill is made at the contract unit price for each type of drainfill, complete in place. Except as otherwise specified in section 9 of this specification, such payment will constitute full compensation for all labor, equipment, material, and all other items necessary and incidental to the performance of the work.
Method 2—For items of work for which specific unit prices are established in the contract, the quantity of drainfill
placed within the specified limits is computed to the nearest 0.1 ton by actual weight. Where the engineer directs
placement of drainfill outside the neat lines to replace unsuitable foundation material, the weight of such drainfill is
included. The weight included is only to the extent that the unsuitable condition is not a result of the contractor's
improper construction operation in the determination of the engineer.
Payment for drainfill is made at the contract unit price for each type of drainfill, complete in place. Except as otherwise specified in section 9 of this specification, such payment will constitute full compensation for all labor, equipment, material, and all other items necessary and incidental to the performance of the work.
Compensation for any item of work described in the contract, but not included in the bid schedule is included in
the payment for the item of work to which it is made subsidiary. Such items and the items to which they are madesubsidiary are identified in section 9 of this specification.

9.

Items of work and construction details(210–VI–NEH, May 2001)

24–3

9. Items of Work and Construction Details
In Section 2, Material, Method 1 shall apply. The percentage of drainfill materials that isfiner than the No. 200 U.S. Standard Sieve Size (0.074 millimeter) shall be as shown on
the drawings when determined in accordance with the procedures contained in ASTM
C117. Fines shall be non-plastic when tested in accordance with ASTM D4318.
In Section 5, Control of moisture, Fine Filter drainfill shall be in wet or near saturated
condition when placed. Each layer of Fine Filter drainfill shall be saturated immediately
prior to compaction. No control of moisture is required for Coarse Filter drainfill.
In Section 6, Compaction, for Fine Filter drainfill, Class A compaction with the following
exceptions shall apply:
The compacted dry density shall be a minimum of 98% of the maximum dry
density as determined by the method in ASTM D698.
The ASTM D698 test procedure shall be modified to consist of a 1-point test
performed on a representative sample of oven-dried drainfill. The procedure shallbe repeated three times to obtain an average value for the maximum dry density.
Compaction shall be achieved using a suitable vibratory compactor.In Section 6,
Compaction, for Coarse Filter drainfill placed under the RCC Spillway, Class A
compaction with the following exceptions shall apply:
The compacted dry density shall be a minimum of 98% of the maximum dry
density as determined by the method in ASTM D698.
The ASTM D698 test procedure shall be modified to consist of a 1-point test
performed on a representative sample of oven-dried drainfill. The procedure shallbe repeated three times to obtain an average value for the maximum dry density.
Compaction shall be achieved using a suitable vibratory compactor.
In Section 6, Compaction, for Coarse Filter drainfill placed as part of the toe drain andstrip drains/outlet for the principal spillway filter diaphragm, Class III compaction shallapply.
In Section 8, Measurement and payment, Method 1 shall apply. A deduction in volume
will not be made for embedded conduits.
Items of work to be performed in conformance with this specification and theconstruction details therefore are:a.

Bid Item 15, Drainfill, Fine Filter(1)This item shall consist of furnishing and installing fine-graded filter
material required for the principal spillway filter diaphragm, impact
basin drain and filter, filter blanket, the foundation toe drain, and thefilter diaphragm for the decommissioned existing principal spillway
conduit.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

24-4

b.

c.

d.

(2)

Fine filter shall be placed in such a manner as to prevent segregation ofparticle sizes.

(3)

The item of work subsidiary to this bid item is Excavation, Common,
Drainfill, Fine Filter as specified in Construction Specification 21.

Bid Item 16, Drainfill, Coarse Filter(1)This item shall consist of furnishing and installing coarse-graded filter
material required for the RCC spillway underdrain, impact basin drain
and filter, and the foundation toe drain.

(2)

Coarse filter gradation requirements are shown on the drawings. Coarse
filter shall have D15/d85 ≤ 4, where D15 is the particle size corresponding
to 15% finer by weight of the coarse filter and d85 is the particle size
corresponding to 85% finer by weight of the fine filter.

(3)

Coarse filter shall be placed in such a manner as to prevent segregationof particle sizes.

(4)

The item of work subsidiary to this bid item is Excavation, Common,
Drainfill, Coarse Filter as specified in Construction Specification 21.

Bid Item 17, Flexbase(1)

This item shall consist of furnishing and installing Flexbase (FlexibleBase) material Texas Department of Transportation (TxDOT) Item 247
required beneath Principal Spillway Inlet and Impact Basin foundations
as shown on the drawings.

(2)

Flexbase aggregate shall be Type A, Grade 1-2 as per TxDOT Item 247
Table 1. Flexbase shall be placed in such a manner as to prevent
segregation of particle sizes.

(3)

Flexbase shall be placed in maximum loose lift thickness of 9 inches.

(4)

Flexbase shall be compacted to a minimum of 100% of maximum dry
density per ASTM D698. Compaction moisture shall be between -2%
and +2% of optimum moisture per ASTM D698.

(5)

The item of work subsidiary to this bid item is Excavation, Common,
Flexbase as specified in Construction Specification 21.

Bid Item 30, Riprap Bedding(1)This item shall consist of furnishing and installing bedding material
required beneath rock riprap as shown on the drawings.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

24-5

(2)

Riprap bedding gradation requirements are shown on the drawings.

(3)

Riprap bedding shall be placed in such a manner as to prevent
segregation of particle sizes.

(4)

The item of work subsidiary to this bid item is Excavation, Common,
Rock Riprap and Riprap Bedding as specified in Construction
Specification 21.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

24-6

Construction Specification 26—Topsoiling
1. Scope
The work consists of furnishing and spreading topsoil to specified depths at locations shown on the drawings.
2. Quality of topsoil
Topsoil shall consist of friable surface soil reasonably free of grass, roots, weeds, sticks, rocks, or other unsuitablematerial. Additional quality requirements, if any, are in section 7 of this specification.
3. Furnishing
Method 1—Topsoil shall be salvaged from designated earth surfaces that will be disturbed by construction activities. After designated sites have been cleared and grubbed, the topsoil shall be removed from the designated areasand stockpiled at locations shown on the drawings or acceptable to the engineer. Unsuitable material encounteredduring removal of topsoil shall be disposed of at locations shown on the drawings or approved by the engineer,or it will be otherwise hauled and disposed of at locations removed from the construction site. The contractor is
responsible for complying with all local rules and regulations and the payment of any and all fees that may result
from the disposal at locations outside the construction work limits.
Method 2—Topsoil shall be furnished from an offsite source designated by the contractor. The engineer shall be
granted access to the source for inspection and acceptance before delivery to the site. Test results and samples
shall be provided when specified in section 7 of this specification.

4. Stockpiling
Stockpiles of topsoil shall not conflict with the requirements of Construction Specification 5, Pollution Control,when made a part of this contract.
5. Spreading
Method 1—Spreading shall not be conducted when the ground or topsoil is frozen, excessively wet, or otherwise
in a condition detrimental to uniform spreading operations. Surfaces designated to receive a topsoil application
shall be lightly scarified just before the spreading operation.
Following the spreading operation, the topsoil surface shall be left reasonably smooth and without ruts or surface
irregularities that could contribute to concentrated waterflow downslope.
Method 2—Spreading shall not be performed when the ground or topsoil is frozen, excessively wet, or otherwise
in a condition detrimental to uniform spreading operations. Surfaces designated to receive a topsoil application
shall be lightly scarified just before the spreading operation. Where compacted earthfills are designated to be topsoiled, the topsoil shall be placed concurrently with the earthfill and shall be bonded to the compacted fill with thecompacting equipment.
Following the spreading operation, the topsoil surface shall be left reasonably smooth and without ruts or surface
irregularities that could contribute to concentrated waterflow downslope.

6. Measurement and payment
Method 1—The total surface covered by topsoil is measured and the area(s) computed to the nearest square yard.
Payment for furnishing and placing topsoil is made at the contract unit price.

(210–VI–NEH, May 2001)

26–1

Method 2—The total surface covered by topsoil, except the surface area of embankments, levees, dikes, and otherearthfills not included for payment, is measured and the area(s) computed to the nearest square yard.
Payment for topsoil spread on the surface of embankments, levees, dikes, and other earthfills is included in themeasurement and payment for that item of earthfill where topsoil application occurred.
Method 3—For items of work for which specific unit prices are established in the contract, the volume of topsoil
furnished and spread is computed to the nearest cubic yard by the method of average cross-sectional end areasfrom surveys of the excavated topsoil stockpile or, if not stockpiled, cross-sectional surveys of the borrow area(s).
Payment for furnishing and spreading topsoil is made at the contract unit price.
All methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed in the bid schedule is included in the payment for the item ofwork to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in
section 7 of this specification.
All payment methods—Payment will constitute full compensation for all labor, equipment, material, and allother items necessary and incidental to the completion of the work. This includes excavating, stockpiling, hauling,spreading, and the wasting of unsuitable excavated material.

7.

26–2

Items of work and construction details(210–VI–NEH, May 2001)

7. Items of Work and Construction Details
In Section 2, the Contractor is responsible for performing a Soil Sample Analysis according to theCounty Agriculture Extension Services criteria. Recommendations from the Soil Sample
Analysis shall be incorporated into revegetation activities for areas to receive topsoil.
In Section 3, Furnishing, Method 1 shall apply.
In Section 5, Spreading, Method 1 shall apply.
In Section 6, Measurement and payment, Method 1 shall apply.
Topsoil shall be processed by pulverizing and shall have the moisture content adjusted to
optimum to facilitate uniform spreading to the specified thickness.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 18, Topsoiling(1)

This item shall consist of salvaging of approved topsoil from required excavations;from the stripping operations; and from borrow areas and placing and spreading it
on all designated earthfills, waste areas, and exposed excavated slopes as indicatedon the drawings.

(2)

Topsoil shall be placed after the earthfill placement has been completed.

(3)

The depth of topsoil for the embankment earthfills, subsidiary earthfills, and waste
areas shall be 12 inches vertical thickness.

(4)

The depth of topsoil for exposed cut slopes in the outlet channel, as well as
exposed cut slopes for the embankment subgrade shall be 12 inches.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

26-3

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

26-4

Construction Specification 27—Diversion and Waterways
1. Scope
The work consists of all excavations, shaping, grading, and earthfills required to construct the diversions and waterways as shown on the drawings or as staked in the field.
2. Material
The earth material used in constructing the earthfill portions of the diversions or waterways shall be suitable material obtained from required excavations or earth material obtained from designated borrow areas. Material forearthfills shall be free from frozen material, brush, roots, sod, stones over 6 inches in diameter, or other objectionable material.
3. Foundation preparation
Foundations for earthfill shall be stripped to remove vegetation and other unsuitable materials or shall be excavated as specified.
Except as otherwise specified, earth foundation surfaces shall be graded to remove surface irregularities and shallbe scarified parallel to the axis of the earthfill or otherwise acceptably scored and loosened to a minimum depthof 2 inches. The moisture content of the loosened material shall be controlled as specified for the earthfill, and thesurface material of the foundation shall be compacted and bonded with the first layer of earthfill as specified for
subsequent layers of earthfill.
Earth abutment surfaces shall be free of loose, uncompacted earth in excess of 2 inches in depth normal to theslope and shall be at such a moisture content that the earthfill can be compacted against them to produce a goodbond between the earthfill and the abutments.

4. Placement
Earthfill material shall not be placed until the required foundation preparation is complete, inspected, and approved for placement. Earthfill shall not be placed upon a frozen surface. Earthfill shall be placed in horizontal
layers not exceeding 9 inches in thickness. The moisture content of the earthfill materials shall be sufficient toobtain firm and suitable compaction. Compaction shall be obtained by routing the hauling and spreading equipment
over the earthfill material so that the entire surface of each layer is traversed by not less than one track tread of theloaded equipment, or equivalent methods approved by the engineer.
5. Excavation
Excavation shall be to the lines and grades shown on the drawings or as staked in the field. All surplus and unsuitable material is designated as waste and shall be disposed of at locations shown on the drawings or at a location
approved by the engineer.
6. Measurement and payment
Method 1—For items of work for which specific unit prices are established in the contract, the length of waterway
or diversion is determined to the nearest linear foot by measurement along the centerline of the waterway or diversion. Such payment will constitute full compensation for all labor, material, equipment, and all other items necessary and incidental to the performance of the work.
Method 2—For items of work for which specific lump sum prices are established in the contract, the quantity ofwaterways or diversions is not measured for payment. Payment for waterways and diversions is made at the contract lump sum price and shall constitute full compensation for all labor, material, equipment, and all other items
necessary and incidental to the performance of the work.

(210–VI–NEH, May 2001)

27–1

Method 3—The pay limits for excavation and earthfill shall be as designated on the drawings. Payment for excavation and earthfill to construct the waterways and diversions is separately measured and computed to the nearest
cubic yard by the method of average cross-sectional end areas. Payment for excavation and earthfill is made at theunit price bid and shall constitute full compensation for all labor, material, equipment, and all other items necessary and incidental to the performance of the work.
All methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed in the bid schedule is included in the payment for the item ofwork to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in
section 7 of this specification.

7.

27–2

Items of work and construction details(210–VI–NEH, May 2001)

7. Items of Work and Construction Details
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 17, Diversions(1)

This item shall consist of all work required to construct the stub diversions as
specified in the construction drawings.

(2)

The locations of the stub diversions shown on the drawings are approximate. The
final locations shall be designated by the Engineer.

(3)

Stub diversions shall have a 13 ft. minimum base width, 3:1 sideslopes, and an 18inch minimum height. The diversion height may be secured by grading a channel
across high points to reduce the height of fill required in low areas. Where achannel section is required, the minimum bottom width of the channel shall be 12
ft. with a cut slope of 3:1 or flatter.

(4)

In Section 6, Measurement and payment, Method 1 shall apply.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

27-3

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

27-4

Construction Specification 28—Lime Treated Earthfill
1.

Scope

The work consists of furnishing lime, mixing lime with soil, curing, and placing the lime treated soil.

2. Material
Soil material shall be obtained from the designated area(s). The selection of the material shall be as outlined in
section 12 of this specification. Soil material shall contain no frozen soil, sod, brush, roots, or other perishable
material. Rock particles larger than the maximum size specified for each type of earthfill shall be removed before
treatment operations.
Water shall be clean and free from injurious amounts of oil, acid, alkali, organic matter, or other deleterious substances.
Hydrated lime shall meet the requirements of Material Specification 593.

3. Equipment
All equipment necessary for the proper construction of the work shall be on the work site before the lime treatment operations start. Unless otherwise specified, mixing equipment shall include the combined use of heavy disk
plows and high speed rotary mixers. Disks shall be at least 24 inches in diameter, and rotary mixers shall be capable of mixing lifts at least 9 inches thick traveling at a minimum speed of 4 miles per hour and covering a minimum
width of 6 feet.
All equipment used to convey or transport lime to or on the work site shall be covered or enclosed to avoid lime
dust problems.

4. Site preparation
The contractor shall prepare, mix, and cure the lime treated earth material in the area(s) shown on the drawings.
Before lime treatment operations start, the processing area used for mixing and curing shall be stripped of topsoil
and graded to a relatively smooth and uniform surface.
After the area is no longer required for mixing and curing, it shall be regraded as required, disked to a depth of 4
inches, and covered uniformly with the removed topsoil.

5. Lime proportioning
The amount of lime shall be as specified in section 12 of this specification. Adjustment in the amount of lime may
be required as the work progresses and shall be adjusted as requested and approved by the engineer.
6. Lime application
Lime shall not be applied when the temperature is below 40 degrees Fahrenheit or is expected to drop below 40
degrees Fahrenheit within 24 hours. Lime will not be applied during high wind conditions that hinder effective application or cause pollution by drift offsite.
Method 1—Hydrated lime shall be uniformly applied in dry form on the soil surface at a rate that will attain thespecified proportioning and lightly sprinkled with water to minimize dusting and blowing.
Method 2—Hydrated lime shall be mixed with water to form a slurry before application to the soil surface. The
slurry shall be a mixture of 1 ton lime to a minimum volume of 500 gallons of water. Agitation shall be accomplished through integral paddles, recirculating pumps, or a combination of these devices. The lime and water shallbe maintained as a uniform mixture until application to the soil surface.

(210–VI–NEH, January 2014)

28–1

The slurry shall be uniformly applied to the soil surface at a rate that will attain the specified proportioning. The
slurry shall be applied under pressure through spray bars.

7. Mixing
The soil, lime, and water shall be mixed by disking and use of rotary mixers until a uniform mixture is obtained.
Disking shall be performed prior to the use of rotary mixers if there are clods in the material that are larger thansix inches in length, width, or height. Rotary mixers shall be applied only after the maximum clod size has been
reduced to less than six inches. During initial mixing with dry lime, a minimum of two cycles of water application
followed by mixing with disks and high speed rotary mixers shall be accomplished.
The depth of the lift for treatment shall be no greater than the depth that can be effectively mixed by the equipment.
The cycle of watering and mixing shall continue until the soil, lime, and water are thoroughly processed to a uniform
mixture without lumps of soil or lime. When mixing is complete, the water content of the mix shall not be less thanstandard optimum water for the soil-lime mixture, when tested in accordance with ASTM D698, Method A.
After mixing, the lime treated layer shall be sealed to minimize evaporation loss, lime carbonation, and excessive wetting from rainfall or other sources. Sealing shall be accomplished by lightly compacting the surface of thetreated layer with a pneumatic tire or smooth wheel roller or by other methods approved by the engineer.
The mixing of lime, soil, and water shall be completed within the same workday it is started.

8. Placement
Lime-treated earthfill shall not be placed until the required excavation and foundation preparation have been completed and the foundation has been inspected and approved by the engineer. Earthfill shall not be placed upon afrozen surface, nor shall snow, ice, or frozen material be incorporated in the earthfill.
Immediately before placement of lime-soil mixture, the subgrade shall be scarified and moistened to create a watercontent that allows suitable bonding of lime-soil mixture. Surface free water shall not be present during placement
operations.
Lime-treated earthfill shall be placed in approximately horizontal layers. The thickness of each layer before compaction shall not exceed the maximum thickness specified in section 12 or shown on the drawings. Material placedby dumping in piles or windrows shall be spread uniformly to not more than the specified thickness before being
compacted.
During placement and compaction of the lime-soil mixture, the moisture content of the material being placed shallbe maintained within the specified range. The water content of the mixture at the time of placement and compaction shall not be less than standard optimum moisture when tested in accordance with ASTM D698, Procedure A.

9. Compaction
Lime-treated earthfill shall be compacted in accordance with section 6 of Construction Specification 23, Earthfill,
for the specified class.
10. Curing
The lime and soil mixture shall be cured at least 72 hours unless otherwise specified in section 12. The water content of the mixture shall be maintained at or above standard optimum water content during the curing period bysprinkling with water, remixing, and resealing.
After the required curing time has occurred and before use as earthfill, the treated material shall be thoroughly
remixed. Final mixing shall be accomplished so that all nonslaked lime particles retained on the No. 4 sieve areremoved. The remaining material shall have all clods reduced in size to meet the following gradation:
Minimum passing 2-inch sieve = 100 percent
Minimum passing no. 4 sieve = 60 percent

28–2(210–VI–NEH, January 2014)11. Measurement and payment
For items of work for which specific unit prices are established in the contract bid schedule:(1) The quantity of lime used for lime treatment is measured to the nearest ton by actual weight.
(2) The volume of lime stabilized earthfill within the specified zone boundaries and pay limits shown on thedrawings are measured and computed to the nearest cubic yard by the method of average cross-sectionalend areas. Unless otherwise specified, no deduction in volume is made for embedded conduits and appurtenances.
The pay limits for lime-treated earthfill shall be as defined below, with the further provision that lime stabilized
earthfill required to fill voids resulting from overexcavation of the foundation and/or placed outside the specifiedlines and grades will be included in the measurement for payment only where such placement is approved by theengineer. Such approval will only be granted for the purpose of filling overexcavation that results from the removalof unsuitable material and where placement outside the lines and grades were not a result of contractor's improper
construction operations as determined by the engineer.
Method 1—The pay limits shall be as designated on the drawings.
Method 2—The pay limits shall be the measured surface of the foundation when approved for placement of lime
treated earthfill and the specified neat lines of the earthfill surface.
Method 3—The pay limits shall be the measured surface of the foundation when approved for placement of lime
treated earthfill and measured surface of the completed earthfill.
Method 4—The pay limits shall be the specified pay limits for excavation and specified neat lines of the earthfill
surface.
Method 5—The pay limits shall be the specified pay limits for excavation and measured surface of the completed
earthfill.
Method 6—Payment for the lime treated earthfill is made at the contract unit price for that type of earthfill. Such
payment will constitute full compensation for all labor, material, equipment, and all other items necessary andincidental to the performance of the work including stripping topsoil, grading, and spreading topsoil over the processing area following completion of lime treated earthfill activities. No separate payment will be made for water
applied to the foundation and used for preparing hydrated lime.
Method 7—Payment for lime treated earthfill is made at the contract unit price for that type of earthfill. Such payment will constitute full compensation for all labor, material, equipment, and all other items necessary and incidental to the performance of the work, including stripping topsoil, grading, and spreading topsoil over the processing
area following completion of lime treated earthfill activities. It does not include furnishing, transporting, and applying water to the foundation and earthfill material. Water applied to the foundation and earthfill material is measured and payment made as specified in Construction Specification 10, Water for Construction.
All methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed in the bid schedule is included in the payment for the item ofwork to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in
section 12 of this specification.

12. Items of work and construction details(210–VI–NEH, January 2014)28–3

12. Items of Work and Construction Details
In Section 2, Material, soil material and rock particles larger than 2 inches in any dimension shallbe removed prior to treatment. The Contractor is responsible for pre-construction testing of soilmaterials in potential borrow sources to confirm lime treatment mix design. Ongoing quality
control testing shall be required during construction. The design lime application rate and curing
time shall achieve the following for lime-treated soil:
•
•
•
•
•

Reduction in PI ≤ 15;
Stable pH ≥ 12.4;
7-day unconfined compressive strength of 25 psi or greater;
28-day unconfined compressive strength of 50 psi or greater; andReduction in soluble sulfate concentration to less than 3,000 ppm after curing and prior toplacement.

The required pre-construction and ongoing quality control testing methods and frequency for lime
treated earthfill shall be as follows:
•
•
•
•
•
•
•
•
•

Soluble sulfates (ASTM C1580/D516): 2 per borrow area and every 1,000 CY
Particle size distribution (ASTM D422/6913): 2 per borrow area and every 1,000 CY
Atterberg limits (ASTM D4318): 2 per borrow area and every 1,000 CY
Organic content (ASTM D2974): 2 per borrow area and every 1,000 CY
Admixing Lime to Reduce Plasticity (TXDOT Tex-112-E): 1 per borrow area and every
5,000 CY
Soil-Lime pH (ASTM D6276): 1 per borrow area and every 5,000 CYStandard Proctor (ASTM D698)*: 1 per borrow area and every 5,000 CY
Lime Content (ASTM D3155): 1 per borrow area and every 5,000 CY
Unconfined Compression (ASTM D5102, Tex-121-E Part I): 1 per borrow area andevery 5,000 CYStandard Proctor and Unconfined Compression test samples shall be prepared at the design lime
mix application rate (minimum 4% lime on a dry weight basis for quicklime, and minimum 5%
lime on a dry weight basis hydrated lime). For Standard Proctor and Unconfined Compression
test methods, preparation of laboratory-mixed samples of lime treated earthfill shall follow theprocedures listed in the respective ASTM standards, but shall be modified by requirements formoisture addition, standing time, lime mixing, and curing time listed in the Texas Department ofTransportation (TxDOT) Tex-121-E, Soil-Lime Testing, Part I. Unconfined compressive strength
testing shall be conducted at 7, 14, and 28 days following mixing, with results of 3 test samples
per cure time reported (9 samples per set of unconfined compression testing).
For soils with initial soluble sulfate concentration greater than 3,000 ppm, each soil-lime test shall
include a plot of sulfate content versus curing time for the lime-treated soil. If field-mixed lime
treated earthfill must be reworked and recompacted for any reason, field sampling andpreparation of samples for Standard Proctor testing shall be in performed in accordance with Tex121-E, Part II.
The Contractor shall submit to the Engineer the test results and a detailed lime treatment Work
Plan describing the specific methods and procedures to be employed for each borrow source. At
minimum, the Work Plan shall specify the lime type, lime treatment application rate, required
curing time, the number of lime applications, mixing procedures and materials handling, and any
NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

28-4

special procedures to prevent sulfate-induced heave. The Work Plan shall be signed and sealed
by a Professional Engineer licensed in the State of Texas.
Quicklime shall be required when the soluble sulfate concentration of soil materials to be treatedis less than 3,000 ppm or less. Quicklime is not permitted when sulfate concentration of soils
materials to be treated exceeds 3,000 ppm, in which case hydrated lime shall be required. Limetreatment shall not be permitted for soil material with soluble sulfate concentration greater than
7,000 ppm. Quicklime and hydrated lime shall meet the requirements of Material Specifications
303 and 593, respectively.
In Section 3, Equipment, the minimum disk size shall be 34 inches in diameter. An increase in
the weight of the plow; an increase in disc size; a decrease in thickness of lifts being placed, or
any combination of these may be required to accomplish the blending and bonding herein
specified.
In Section 6, Lime application, none of the methods shall apply for use of quicklime. Quicklime
shall be uniformly applied in dry form on the soil surface at a rate that will attain the specified
proportioning and watered until thoroughly wet to induce slaking. If hydrated lime is used,
Method 1 shall apply. Modification of the lime application method is subject to review andapproval by the Engineer.
Immediately prior to placement of the initial fill layer on earthen foundations, the strippedfoundation shall be loosened to a depth of approximately 6 inches and, after any necessary
moisture adjustment, shall be recompacted as specified in the Earthfill Construction
Specification, CS 23.
Immediately before placement of the lime-soil mixture on the previous layer, the subgrade shallbe scarified and watered, as necessary, to adjust the moisture in the top four inches to within thespecified range for material compacted according to compaction Class A as specified herein.
In Section 9, Compaction, Class A compaction in Section 6 of Construction Specification 23 shallapply. In-place compacted dry density of materials being placed shall be as shown on thedrawings. The reference maximum dry density and optimum moisture content for fieldcompaction control testing shall be obtained from laboratory moisture-density relationship testing
performed in accordance with the procedures contained in ASTM D698 (Laboratory Compaction
Characteristics of Soil Using Standard Effort) using Procedure A or B, as appropriate. The
laboratory moisture-density testing shall be performed on samples of lime treated earthfill as
follows: 1) untreated soil samples obtained from borrow sources and mixed with lime in thelaboratory at the design lime application rate; 2) lime treated earthfill mixed in the field andobtained from lime mixing areas; and/or 3) lime treated earthfill which has been previously
mixed, placed, and compacted but requires reworking and recompaction. The moisture content at
the time of placement and compaction shall be adjusted as necessary to meet the requirements
shown on the drawings. .
After being deposited on the fill, each lift of fill material shall be spread, bladed and smoothed tothe extent necessary to ensure that the surface is free of abrupt mounds, depressions or windrows
to provide a smooth uniform surface for operation of plowing and compaction equipment.
Maximum layer thickness shall be 9 inches before compaction and the maximum particle size
shall be 2 inches. Each lift of fill material shall then be disked, bladed, and plowed to an

NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

28-5

acceptable degree and depth so as to thoroughly loosen, blend, and bond the material with thepreceding lift before compaction is started.
All surfaces shall be closely examined immediately prior to the placement of all earthfills andbackfills. All materials that exhibit drying cracks, slaking, or other evidences of being unstable or
unsuitable, shall be removed or reworked by scarification, wetting, and compaction to theaffected depths prior to the placement of fill. Additional compensation will not be made for thiswork as herein specified.
In Section 11, Measurement and payment, Methods 4 and 6 shall apply.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 20, Lime Treated Earthfill (Material Types F and G)(1)This item shall consist of mixing and placing lime treated earthfill beneath andadjacent to the RCC spillway to the lines, grades, and locations as shown on thedrawings.

(2)

The selection of material shall be approved by the Engineer.

(3)

The item of work subsidiary to this bid item is Excavation, Common, Borrow as
specified in Construction Specification 21.

b. Bid Item 21, Furnishing and Handling Lime (Material Types F and G)(1)This item shall consist of furnishing and handling lime used in treatment of earthfillmaterials.

(2)

Quicklime shall meet the requirements of Material Specification 303, Quicklime.

(3)

Hydrated lime shall meet the requirements of Material Specification 593, Lime.

(4)

In Section 5, the minimum amount of quicklime required for treatment shall be 4%
relative to the dry weight of the soil being treated. If hydrated lime is used, theminimum application rate shall be 5% relative to the dry weight of soil being
treated. Adjustments in the amount of lime being used may be required to obtain
the required compressive strength and/or as the work progresses; the Engineer shallbe notified in advance if a change in the lime application rate is warranted.

(5)

The Contractor shall take all protective measures necessary to prevent damage topersons or property from contact with lime. The Contractor’s employees shall beadequately informed and trained about the hazards of working with lime.

(6)

Application of lime shall only be permitted in soil stockpile areas, and shall not bedirectly applied to soils within the footprint of the fill area and/or on the dam
embankment.

NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

28-6

(7)

In Section 10, allow the mixture to cure/mellow for at least 7 days or longer if
required based on testing results in order to reduce the soluble sulfate concentration
to 3,000 ppm or less prior to placement as lime-treated earthfill.

NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

28-7

This page intentionally left blank.

NRCS-12/21
TX-PLUM CREEK, SITE 21 REHABILITATION

28-8

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Construction Specification 31—Concrete for Major Structures
1.

Scope

The work consists of furnishing, forming, placing, finishing, and curing portland cement concrete as required to build the structuresdesignated in section 25 of this specification.
The following BioPreferred® product category is applicable to this specification.
— Concrete release fluids (a.k.a., form-release agents)

2.

Material

Aggregates must conform to the requirements of section 25 and Material Specification 522, Aggregates for Portland Cement
Concrete, unless otherwise specified.
Portland cement must conform to the requirements of Material Specification 531, Portland Cement, for the specified type. One brandonly of any type of cement may be used in any single structure as defined in section 25.
Fly ash must conform to the requirements of Material Specification 532, Supplementary Cementitious Materials.
Blast-furnace slag used as a partial substitution of portland cement in concrete must conform to the requirements of Material
Specification 532, Supplementary Cementitious Materials.
Silica fume must conform to the requirements of Material Specification 532, Supplementary Cementitious Materials.
Air-entraining admixtures must conform to the requirements of Material Specification 533, Chemical Admixtures for Concrete. If
air-entraining cement is used, any additional air-entraining admixture must be of the same type as that in the cement.
Plasticizing admixtures must conform to the requirements of Material Specification 533, Chemical Admixtures for Concrete.
Water-reducing or retarding admixtures must conform to the requirements of Material Specification 533, Chemical Admixtures forConcrete.
Accelerating and water-reducing and accelerating admixtures, if specified in section 25, must conform to the requirements ofMaterial Specification 533, Chemical Admixtures for Concrete.
Curing compound must conform to the requirements of Material Specification 534, Concrete Curing Compound.
Preformed expansion joint filler must conform to the requirements of Material Specification 535, Preformed Expansion Joint Filler.
Sealing compound for joints must conform to the requirements of Material Specification 536, Sealing Compound for Joints inConcrete and Concrete Pipe.
Waterstops must conform to the requirements of Material Specifications 537, Nonmetallic Waterstops, and 538, Metal Waterstops,
for the specified kinds.
Dowels must be a plain, round steel bar conforming to the requirements of Material Specification 539, Steel Reinforcement (forconcrete).
Metal plates must conform to the requirements of Material Specification 581, Metal, for structural quality or commercial or merchantquality steel. Structural quality must be used only if specifically designated in the drawings or specifications.
Water used in mixing and curing concrete must be clean and free from injurious amounts of oil, salt, acid, alkali, organic matter, orother deleterious substances.

(210-VI-NEH, Amend 2, Sept. 2018)

31–1

Chapter 2

3.

National Standard Construction Specification

Part 642 National Engineering Handbook

Concrete mix design

Method 1
Responsibilities—The contractor is responsible for the design and proportioning of the concrete. Job mixes must be prepared to meetthe quality, consistency, and strength of concrete specified.
Submittals—At least 15 calendar days before the placement of any concrete, the contractor must provide the engineer with fulldocumentation to support each job mix and any admixtures to be used in the work. The contractor must furnish test results to theengineer for each admixture showing that it meets the requirements of Material Specification 533, Chemical Admixtures for Concrete.
Job mixes are reviewed and accepted or rejected by the engineer within 8 calendar days following the date of submittal. After a job
mix has been accepted, neither the source, character, nor gradation of the aggregates nor the type or brand of cement or admixtures
may be changed without prior notice to the engineer. Revisions or changes in a job mix that are determined to be significant by theengineer must follow the same submittal and acceptance process as that for the initial job mix.
Design criteria—The class of concrete must be as specified in section 25 and in accordance with the following specified compressive
strength.
Class of concrete

Specified compressive
strength (f 'c) at 28 days
(lb/in2)

5000

5,000

4000

4,000

3000

3,000

2500

2,500

Maximum water-cement ratio must be 0.50, unless otherwise specified.
Unless otherwise specified the air content (by volume) of the concrete at the time of placement must be:
Maximum size aggregate

Air content (%)

3/8 inch to l inch

5 to 7

Over l inch

4 to 6The consistency of all concrete must allow it to be placed without segregation or excessive laitance. Unless otherwise specified, theslump must be:Type of structural section

Slump (inches)

Massive sections, pavements, footings

2±1

Heavy beams, thick slabs, thick walls (>12 inches)

3±1

Columns, light beams, thin slabs, thin walls (12 inches or less)

4±l

31–2

(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Superplasticized concrete must contain either a water-reducing, high range admixture (ASTM C494, Type F or G) or a plasticizing
admixture (ASTM C1017) at a dosage rate that reduces the quantity of water required to produce a concrete mix within the above
slump range by 12 percent or more or produces an increase in the slump of at least 2 inches above the slump of the design mix
containing no water reducer or plasticizing admixture.
A water-reducing admixture (ASTM C494, Type F or G), a plasticizing admixture (ASTM C1017), or both may be added to an
approved job mix without resubmittal and reapproval of the job mix if the following requirements are met:a. The admixture must be introduced into the concrete mix as specified by the manufacturer and be compatible with otheradmixtures in the job mix.
b. The water content must be equal to or less than that required in the job mix without the admixture.
c. The cement content must be the same as that required in the job mix without the admixture.
d. The air content must be within the specified range.
e. The slump must not exceed 7.5 inches unless the contractor demonstrates before placement that the job mix can be placed
without segregation or excessive laitance at a slump greater than 7.5 inches. The concrete must retain the increased slump for
not less than 30 minutes.
f. If the admixture is added at the job site, the slump of the concrete before the addition of the admixture must not exceed theslump specified above for concrete that does not contain the admixture.
Calcium chloride or other corrosive accelerators may not be used unless otherwise specified.
Fly ash may be used as a partial substitution for portland cement in an amount not greater than 25 percent (by weight) of cement in theconcrete mix unless otherwise specified.
Ground granulated blast-furnace slag may be used as a partial substitution for portland cement in amounts between 25 to 70 percent(by weight) of cement in the concrete mix unless otherwise specified.
Silica fume may be used as a partial substitution for portland cement in an amount ranging from 5 to 10 percent (by weight) of cementin the concrete mix unless otherwise specified.
Job mix criteria—Proportioning of concrete for job mixes must be based on the standard deviation computed from compressive
strength tests of previous batch records or established by laboratory trial mixes. Unless otherwise specified, a compressive strength
test is the average of the compressive strengths of two standard cured cylinders prepared and tested in accordance with section 4.
For a job mix based upon the standard deviation computed from compressive strength tests of previous batch records, the previous
batches must represent similar material and conditions to those expected for the job mix and have a strength within 1,000 pounds per
square inch of the specified compressive strength (f 'c) at 28 days for the class of concrete specified. The contractor must provide to
the engineer copies of the facility’s previous batching records that show the compressive strength results and the batch mix designused.
For a job mix based upon a laboratory trial mix, the trial mix must contain the actual material to be used in the final job mix, have aslump within 0.75 inches of the maximum allowable slump, and have an air content within 0.5 percent of the maximum allowable aircontent. The contractor must provide the engineer with copies of the actual compressive strength test records for the trial mix from thetesting facility performing the test.
The trial job mix or previous batch records must include the water-reducing admixture when a water-reducing admixture is used in a
concrete mix specifically to improve the physical properties of the hardened concrete or change portions of the mix components.
In meeting strength requirements, the selected job mix proportions must produce an average strength, fcr, exceeding the specifiedcompressive strength, f 'c, by the amount specified.

(210-VI-NEH, Amend 2, Sept. 2018)

31–3

Chapter 2nNational Standard Construction Specification

s30

fcr

>30 1.00 s

The larger of these25

1.03 stwo equations:20

1.08 sf 'c + 1.34 s30

15

1.16 sf 'c + 2.33 s30–500<15Part 642 National Engineering Handbook

f 'c + 1,000 for f 'c < 3,000
f 'c + 1,200 for 3,000 ≤ f 'c ≤5,000
1.10 f 'c + 700 for f 'c > 5,000

Where—n= number of consecutive compressive strength tests
s30 = standard deviation adjusted to 30 tests, lb/in2= required average compressive strength, lb/in2
fcr
f 'c = specified compressive strength of concrete, lb/in2s= standard deviation (lb/in2) computed as {[sum(Xi-Xa)2]/[n-1]}1/2
where:
Xi = individual strength test result, lb/in2
Xa = average of n strength test results, lb/in2
Method 2
Responsibilities—The engineer is responsible for the design and proportioning of the job mix. The initial job mix must be as
specified in section 25. The engineer may adjust the initial job mix proportions to establish the designated job mix. The engineer will
provide the contractor with a copy of each job mix as soon as the material and proportions have been determined. After the job mix
has been designated, neither the source, character, nor gradation of the aggregates nor the type or brand of cement or admixtures may
be changed without prior approval of the engineer. During the course of the work, the engineer may adjust the job mix proportions andbatch weights whenever necessary to meet special job conditions.
The contractor, for each class of concrete, is responsible for—a. Taking the following actions and furnishing the engineer with the following information at least 35 calendar days before any
placement of concrete, unless otherwise designated:(1) Select the source of aggregates and sample and test the gradations of aggregates available.
(2) Select the brand and type of cement.
(3) Select the brand of admixtures and obtain manufacturer’s test data and recommendation of use.
(4) Identify the concrete production facility, the type of mixer, and the mixing methods that will be used.
(5) Provide from the concrete production facility consecutive compressive strength test records and batching records forconcrete mixes that have material, proportions, and compressive strengths within 1 000 pounds per square inch of the
proposed design mix.
b. Batching at least 3 cubic yards of the initial job mix, in the presence of the engineer, for testing and evaluation not less than 30
calendar days before any placement of concrete.

31–4(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

4.

National Standard Construction Specification

Part 642 National Engineering Handbook

Inspecting and testing

During the course of the work, the engineer performs quality assurance testing as required to verify the concrete meets the contract
requirements. The engineer must have free entry to the plant and equipment furnishing concrete under the contract. Proper facilities
must be provided for the engineer to inspect material, equipment, and processes and to obtain samples of the concrete. All tests andinspections are conducted so as not to interfere unnecessarily with the manufacture, delivery, and placement of the concrete.
Any portion of a batch may be tested by the engineer for any of the purposes shown below. Samples taken for testing must be
representative of that part of the batch.
a. Determining uniformity of the batch.
b. Checking compliance with requirements for slump and air content when the batch is discharged over an extended period.
c. Checking compliance of the concrete with the specifications when the whole amount being placed in a small structure, or a
distinct part of a larger structure, is less than full batch.
If concrete is conveyed to the placement location by pumping or conveyor belts, the samples must be collected at the discharge end.
When a plasticizing admixture is added to the concrete mix at the job site, slump tests are made both before the addition of the
admixture to the concrete mix and after the admixture has been incorporated into the concrete mix.
The tests on concrete are performed by the following methods unless otherwise specified:Type of test

Test method(ASTM designation)

Sampling

C172

Slump test

C143

Air content

C231 or C173

Compression test specimens

C31 or C42

Compressive strength testing

C39

Unit weight

C138

Temperature

C1064

A strength test for concrete is the average of two standard cured concrete cylinders prepared in accordance with ASTM C31 from thesame sample of concrete and tested in accordance with ASTM C39 at 28 days, unless otherwise specified. If one cylinder shows
manifest evidence of improper sampling, molding, curing, or testing, it must be discarded and the strength of the remaining cylinder
must then be considered the compressive strength of the concrete. Should both cylinders show such defects, the entire test must be
discarded.
If both cylinders are discarded or in-place concrete that was not sampled is in question, the in-place concrete may be sampled bycoring in accordance with ASTM C42. For core tests, these requirements must be followed:
a. At least three representative cores must be taken from each area of concrete in question. If one or more of the cores shows
signs of being damaged before testing, it must be replaced by a new one.
b. Test cores must be prepared for testing in accordance with moisture conditioning in ASTM C42 unless the engineer
determines that the concrete in the structure will be dry under service conditions. If the concrete is determined to be dry underservice conditions, the cores must be air dried (temperature 60°F to 80°F and relative humidity less than 60%) for 7 days
before testing and must be tested dry.

5.

Handling and measurement of material

Aggregates must be stored or stockpiled in such a manner that separation of coarse and fine particles of each size is avoided and thatvarious sizes do not become intermixed before proportioning. Methods of handling and transporting aggregates must avoid
contamination, excessive breakage, segregation, degradation, or intermingling of various sizes.
(210-VI-NEH, Amend 2, Sept. 2018)

31–5

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Unless otherwise specified, scales must be beam type or spring-less dial type. They must be accurate when static load tested to plus
0.4 percent of the total capacity of the scales. All exposed fulcrums, clevises, and similar working parts of scales must be kept clean.
Measuring tanks for mixing water must be of adequate capacity to furnish the maximum amount of mixing water required per batch.
Tanks must be equipped with outside taps and valves to verify their calibration unless other means are provided for readily andaccurately determining the amount of water in the tank.
The quantities of each component of the concrete mix must be measured by the following methods and to the accuracy indicatedbelow:
Cement, fly ash, slag—Cement, except as otherwise specifically permitted, must be measured by weight or in bags on which theweight is plainly marked. When cement, fly ash, and slag are supplied in bulk and are measured by weight, they must be weighed on ascale separate from that used for other material and in a hopper entirely free and independent of the hopper used for weighing theaggregate. When fly ash or slag is used in the job mix, the cement and the fly ash or slag may be weighed separately or cumulatively
by weighing the cement first and then adding the fly ash or slag to arrive at the composite weight. The weight of the cement and the
combined weight of the cement and fly ash or slag must be within plus or minus 1 percent of the required weight of the cementitious
material. When cement is measured in bags, no fraction of a bag may be used unless weighed.
Aggregates—Aggregates must be measured by weight unless otherwise specifically permitted. Mix proportions must be based onsaturated, surface-dry weights. The batch weight of each aggregate is the required saturated, surface-dry weight corrected by theweight of surface moisture it contains. The weight of each of the specified aggregates must be within plus or minus 2 percent of therequired weight.
Mixing water—Mixing water consists of water added to the batch, ice added to the batch, water occurring as surface moisture on theaggregates, and water introduced in the form of admixtures. The added water must be measured by weight or volume to an accuracy ofl percent of the required total mixing water. Added ice must be measured by weight. Wash water must not be used as part of themixing water for succeeding batches.
Admixtures—Dry admixtures must be measured by weight. Paste or liquid admixtures must be measured by weight or volume. The
admixtures must be within plus or minus 3 percent of the required weight or volume for each specific admixture.

6.

Mixers and mixing

Mixers are either stationary parts of a central mixing plant or portable equipment, such as revolving drum truck mixers and volumetricbatching/continuous mixing truck mixers. Mixers must be capable of thoroughly mixing the concrete ingredients into a uniform mass
within the specified mixing time and of discharging the mix without segregation. Each mixer or agitator must bear a manufacturer's
rating plate indicating the gross volume of the drum, the capacity of the drum or container in terms of the volume of mixed concrete,
and the minimum and maximum mixing speeds of rotation of the drum, blades, or paddles. When the truck mixer is used for truckmixed concrete as described in section 6a(2) or for shrink-mixed concrete as described in section 6a(3), the capacity of the drum orcontainer in terms of the volume of mixed concrete must not exceed 63 percent of the gross volume of the drum. When the truck
mixer is used to transport central-mixed concrete as described in section 6a(1), the capacity of the drum or container in terms of thevolume of mixed concrete must not exceed 80 percent of the gross volume of the drum. The mixer must be operated in accordancewith these recommendations.
Concrete must be uniform and thoroughly mixed when delivered to the forms in a freshly mixed and unhardened state. Variations inslump of more than 1 inch within a batch is considered evidence of inadequate mixing and must be corrected by changing batchingprocedures, increasing mixing time, changing mixers, or other means. Mixing time must be within the limits specified below unlessthe contractor demonstrates by mixer performance tests that adequate uniformity is obtained by different times of mixing.
No mixing water in excess of the amount called for by the job mix may be added to the concrete during mixing or hauling or after
arrival at the delivery point. Water to compensate for up to a 1-inch loss in slump may be added, not to exceed the design maximum
water cement ratio. Withholding some of the mixing water until the concrete arrives on the job, then adding the remaining water andturning the mixer 30 revolutions at mixing speed is allowed to overcome transporting conditions. When loss of slump or workability
cannot be offset by these measures, complete mixing must be performed by onsite batching and mixing or by using a combination ofcentrally batching and transporting material to the site and adding remainder of material onsite.

31–6(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Concrete may be furnished by ready-mix methods, by volumetric batching and continuous mixing at the site, or by batch mixing at the
site.

a.

Ready-mixed concrete

Ready-mixed concrete must be mixed, transported, and placed in a freshly mixed and unhardened state. The contractor must furnish
the engineer a batch ticket showing amount of concrete in cubic yards, the time of loading, the time the load was discharged, therevolution counter reading at the time of loading and discharge, and the type and actual quantity of each material including all
admixtures used in each batch of concrete. The batch ticket must include information necessary to calculate the water-cementitious
materials ratio.
Truck mixers and truck agitators must be equipped with revolution counters by which the number of revolutions of the drum or blades
may be readily verified. Ready-mixed concrete must be mixed and delivered by one of the following methods:(1)

Central-mixed concrete—Central-mixed concrete is mixed completely in a stationary mixer and transported to the point ofdelivery either in a truck agitator, a truck mixer operating at agitating speed, or non-agitating equipment.
When a truck agitator or a truck mixer is used as an agitator and transports concrete that has been completely mixed in astationary mixer, mixing during transportation must be at the speed designated by the manufacturer of the equipment asagitating speed. When concrete is transported in a truck mixer or truck agitator, the volume of the mixed concrete must notexceed 80 percent of the gross volume of the drum. The total number of revolutions of the truck mixer or truck agitator
must not exceed 200 before discharge of the concrete, unless otherwise specified.
The use of non-agitating equipment to transport concrete to the site of the work is permitted only if the consistency anduniformity of the concrete as discharged at the point of delivery meet the requirements of this specification. Bodies of nonagitating hauling equipment must be constructed so that leakage of the concrete mix, or any part thereof, does not occur.
Concrete hauled in open-top vehicles must be protected from rain and from more than 20 minutes exposure to the sun andwind when the air temperature is above 75 degrees Fahrenheit.

(2)

Truck-mixed concrete—Truck-mixed concrete is completely mixed in a truck mixer. The total volume of all ingredients tobe mixed in a revolving drum truck mixer must not exceed 63 percent of the gross volume of the drum. The concrete
ingredients must be mixed between 70 and 100 revolutions of the drum or blades at the speed designated by the
manufacturer as mixing speed. Mixing in excess of 100 revolutions must be at the speed designated by the manufacturer ofthe equipment as agitating speed.

(3)

Shrink-mixed concrete—Shrink-mixed concrete is partly mixed at a central plant and the mixing is completed in a truck
mixer. The mixing time in the central plant mixer is the minimum required to intermingle the ingredients. The volume of
the mixed concrete in a truck mixer must not exceed 63 percent of the gross volume of the truck drum. The mixing must becompleted in a truck mixer. The number of revolutions of the truck mixer drum or blades must be between 50 and 100
revolutions at the speed designated by the manufacturer as mixing speed. Mixing in excess of 100 revolutions must be at
the speed designated by the manufacturer of the equipment as agitating speed.

b.

Volumetric batching and continuous mixing at the sitec.

Batch mixing at the site

Equipment used for volumetric batching and continuous mixing at the site is commonly referred to as mobile concrete mixers. Unlessotherwise specified, volumetric batching and continuous mixing at the construction site is permitted. The batching and mixing
equipment must conform to the requirements of ASTM C685 and must be demonstrated before placement of concrete by tests with thejob mix to produce concrete meeting the specified proportioning and uniformity requirements. Concrete made by this method must be
produced, inspected, and documented in conformance with ASTM C685.
This method of batching and mixing concrete is either by batching and mixing all material onsite using paving mixers or stationary
construction mixers or by using a combination of centrally batching part of the mix, transporting it to the site, and adding the rest of
the material and mixing onsite.
Paving mixers or stationary construction mixers and associated transport vehicles must be in accordance with recommended practices
described in method 1 for central mixed concrete. The time for mixing a batch of concrete in the mixer drum must be according to
manufacturer's recommendations, but not less than 1 minute plus 0.25 minute for each cubic yard of concrete being mixed (8 yd3 batch= 3 minutes).
(210-VI-NEH, Amend 2, Sept. 2018)

31–7

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

When a combination of centrally batching and transporting material to the site and adding rest of material onsite is used, the contractor
must prepare a written plan detailing how the batching and mixing of the concrete material will be accomplished and controlled. This
written batching and mixing plan must be submitted to the engineer for review and approval not less than 10 working days before theplacement of concrete. The volume of the mixed concrete in a truck mixer must not exceed 63 percent of the gross volume of thedrum.
The contractor must furnish the engineer a batching ticket for each batch of fresh concrete. The ticket shows the type, brand, andamount of cement; the type, name, and amount of each admixture; total water added to the batch, which includes free water on theaggregate; maximum size of aggregate; the type and dry weight of fine aggregate; the type and dry weight of coarse aggregate; thetime of loading (the time that water was introduced to the cement); and the time the load was discharged.

7.

Forms

Forms must be of good quality wood, plywood, steel, or other approved material and must be mortar tight. The forms and associatedfalsework must be substantial and unyielding and must be constructed so that the finished concrete conforms to the specified
dimensions and contours. Form surfaces must be smooth and free from holes, dents, sags, or other irregularities and must be
maintained in this condition throughout the work. Forms must be coated with a non-staining form release agent before being set into
place. Acceptable tolerances for formed structure members are specified in section 23.
When a superplasticized concrete mix is used, forms must be designed to withstand the increased pressures of the superplasticized
concrete and the increased impact forces resulting from larger drop heights used in placing the superplasticized concrete. Form releaseagents must be specifically formulated, when specified, for use with plasticized concrete or documentation from the release agent
manufacturer must be provided stating that formed concrete surfaces made using the form release agent with plasticized concrete havenot varied significantly from nonplasticized concrete surfaces made using the same form release agent. If the form release agent is not
specifically formulated for use with plasticized concrete and, after observing its performance, it is suspected the release agent is
responsible for causing increased surface imperfections (bug-holes), a release agent specifically formulated for use with plasticized
concrete must be used for all formed concrete to be subsequently placed.
Metal ties or anchorages that will be embedded in the concrete must be equipped with cones, she-bolts, or other devices that permit
their removal to a depth of at least 1 inch without injury to the concrete. Ties designed to break off below the surface of the concretemust not be used without cones. If approved fiberglass or plastic form ties are used, the tie ends must be cut flush with the finishedconcrete and ground smooth.
All edges that will be exposed must be chamfered unless finished with molding tools as specified in section 18.

8.

Preparation of forms and subgrade

Before placement of concrete, the forms, embedments, and subgrade must be free of chips, sawdust, debris, water, ice, snow,
extraneous oil, mortar, or other harmful substances or coatings. Any form release agent on the reinforcing steel or other surfaces
required to be bonded to the concrete must be removed.
Rock surfaces must be cleaned by high pressure air-water cutting, sandblasting, or wire brush scrubbing, as necessary, and must bewetted immediately before placement of concrete. The earth surface must be firm and damp. Placement of concrete on mud, driedearth, non-compacted fill, or frozen subgrade is not permitted. All ice, snow, and frost must be removed, and the temperature of all
surfaces, including the reinforcing steel and other steel inclusions, to be in contact with the new concrete must be no colder than 40
degrees Fahrenheit.
Items to be embedded in the concrete must be positioned accurately and anchored firmly.
Weep holes in walls or slabs must be formed with nonferrous material.

9.

Conveying

Concrete must be delivered to the site and discharged completely into the forms within 1.5 hours after the introduction of the mixing
water to the cement and aggregates or the introduction of the cement to the aggregates. In hot weather or under conditions contributing
to quick stiffening of the concrete, or when the temperature of the concrete is 85 degrees Fahrenheit or above, the time between the
introduction of the cement to the aggregates and discharge must not exceed 45 minutes.
Superplasticized concrete may be conveyed and placed when the temperature of the concrete is below 95 degrees Fahrenheit and theslump of the concrete remains within the allowable slump range.
31–8(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

The engineer may allow an appropriate extension of time when the setting time of the concrete is increased a corresponding amountby the addition of an approved admixture. In any case, concrete must be conveyed from the mixer to the forms as rapidly aspracticable by methods that prevent segregation of the aggregates or loss of mortar.

10.

Placing

Concrete must not be placed until the subgrade, forms, steel reinforcement, and other embedments are inspected and approved by theengineer. For walls and columns, subsequent higher placements of concrete must not be placed until the concrete below the newplacement has gained sufficient strength to support the concrete dead load and any superimposed loads without distress. Placement
sequences and timing must consider form removal timing covered in section 16.
If a placement plan is required in section 25, concrete must not be placed until the placement plan has been reviewed and approved by
the engineer. The contractor must have all equipment and material required for curing available at the site ready for use before
placement of concrete begins.
Concrete must be placed only in the presence of the engineer. The contractor must give reasonable notice to the engineer before eachplacement. Such notice must be far enough in advance to give the engineer adequate time to verify that the subgrade, forms, steel
reinforcement, and other preparations comply with specifications. Other preparations include, but are not limited to, the concrete
batching plant, mixing and delivery equipment and system, placing and finishing equipment and system, schedule of work, workforce,and heating or cooling facilities, as applicable. All deficiencies are to be corrected before concrete is delivered for placing.
Concrete must be placed and consolidated to prevent segregation of the mix components. The concrete must be deposited as closely as
possible to its final position in the forms. It must be worked into the corners and angles of the forms and around all reinforcement andembedded items to prevent segregation of aggregates or excessive laitance. The depositing of concrete must be regulated so that theconcrete can be consolidated with a minimum of lateral movement. Concrete placement against a sloping surface must start at thelowest elevation and work upwards to the highest elevation.
Concrete other than architectural concrete must not be dropped more than 5 feet vertically unless suitable equipment is used to prevent
segregation. Architectural concrete must not be dropped more than 3 feet vertically unless suitable equipment is used to prevent
segregation. When a superplasticized concrete mix is used, concrete other than architectural concrete must not be dropped more than
12 feet vertically and architectural concrete must not be dropped more than 10 feet vertically unless suitable equipment is used toprevent segregation.

11.

LayersSlab concrete must be placed to design thickness in one continuous layer unless otherwise specified. Formed concrete must be placedin horizontal layers not more than 20 inches deep. Where a superplasticized concrete mix is used, formed concrete may be placed inhorizontal layers not more than 5 feet deep.
Successive layers of fresh concrete between construction joints must be placed at a rate fast enough that the preceding layer is still
plastic and can be easily mixed with the fresh concrete such that seams (cold joints) or plane of weakness do not occur. If the surface
of a previously placed layer of concrete has taken a set to the degree that it will not flow and mix with the succeeding layer when
vibrated, the contractor must discontinue placing concrete and must make a construction joint according to the procedure specified in
section 13. If placing is discontinued when a layer is incomplete, the ends of the incomplete layer must be formed by a verticalbulkhead.

12.

Consolidating

All concrete must be consolidated with internal type mechanical vibrators capable of transmitting vibration to the concrete at
frequencies not less than 8,000 impulses per minute, unless otherwise specified or approved before placement. Vibration must be
supplemented by spading, rodding, and hand tamping as necessary to ensure smooth and dense concrete along the form surface, in
corners, and around embedded items. The contractor must provide a sufficient number of vibrators to properly consolidate theconcrete immediately after it is placed. A sufficient number of standby vibrators must be kept onsite during the placement of concrete.

(210-VI-NEH, Amend 2, Sept. 2018)

31–9

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Vibration must compact the concrete and bring it into intimate contact with the forms, reinforcing steel, and other embedded items
while removing voids and pockets of entrapped air. The location, insertion, duration, and removal of the vibrators must be such thatmaximum consolidation of the concrete is achieved without causing segregation of the mortar and coarse aggregate or causing wateror cement paste to flush to the surface. Vibration must be applied to the freshly deposited concrete by rapidly inserting the vibrator
and slowly, in an up and down motion, removing the vibrator at points uniformly spaced at not more than 1.5 times the radius of thearea visibly effected by vibration. Generally, this is at 5 to 10 seconds per foot on 14-inch spacings or less. The area visibly effectedby the vibrator must overlap the adjacent, just vibrated area. The vibrator must extend vertically into the previously placed layer offresh concrete by at least 6 inches at all points. This ensures effective bond between layers. In thin slabs the vibrator(s) should besloped toward the horizontal to allow operations in a fully embedded position.
Vibration must not be applied directly to the reinforcement steel, the forms, or other embedded items unless otherwise specified.
Vibration must not be applied to concrete that has hardened to the degree that it does not become plastic when vibrated. If surface
vibrators are used, they may contact forms when consolidating thin slabs.
The use of vibrators to transport concrete in the forms or conveying equipment is not permitted.
Surface vibrators may be used to consolidate slabs 8 inches and less in thickness. Slabs more than 8 inches thick must be consolidatedwith internal vibration and may be augmented through use of surface vibrator, such as vibrating screeds, plate or grid vibratory
tampers, or vibratory roller screeds. If concrete is to be consolidated using surface vibration methods, the contractor must detail how
this work is to be performed in writing to the engineer for review and approval. This report must be submitted no less than 30 calendar
days before placing concrete by this method. It includes equipment selection and specifications.

13.

Construction joints

Construction joints must be made at the locations shown on the drawings unless otherwise specified or approved by the engineer. If
construction joints are needed that are not shown on the drawings, they must be placed in locations approved by the engineer.
Where a feather edge would be produced at a construction joint, as in the top surface of a sloping wall, an insert form must be used sothat the resulting edge thickness on either side of the joint is not less than twice the maximum aggregate diameter used in the concretemix.
Non-vertical construction joints in structural elements, such as walls and columns, must be consolidated and screeded to grade unlessotherwise specified. Construction joints must be covered and wet cured for 7 days or until concrete placement resumes unlessotherwise specified.
Steel tying and form construction next to concrete in place must not be started until the concrete has cured at least 12 hours. Before
new concrete is deposited on or against concrete that has hardened, the forms must be retightened. New concrete must not be placed
until the hardened concrete has cured at least 12 hours.
Method l—The surface of construction joints must be cleaned of all unsatisfactory concrete, laitance, coatings, stains, or debris bysandblasting or high-pressure air-water cutting, or both. Sandblasting can be used after the concrete has gained sufficient strength toresist excessive cutting, and high-pressure air-water cutting can be used as soon as the concrete has hardened sufficiently to preventthe jet from displacing the coarse aggregates. The surface of the concrete in place must be cut to expose clean, sound aggregate, but
not so deep as to undercut the edges of larger particles of the aggregate. After cutting, the surface must be thoroughly washed toremove all loose material. If the surface is congested by reinforcing steel, is relatively inaccessible, has cured beyond the ability to cut
with air-water blasting, or disturbing the concrete before it is hardened is considered undesirable, cleaning of the joint by air or water
jets is not permitted. The sandblasting method is required after the concrete has hardened.
Immediately before new concrete is placed, all construction joints must be wetted and standing water removed.
Method 2—The surface of construction joints must be cleaned of all unsatisfactory concrete, laitance, coatings, stains, or debris bywashing and scrubbing with a wire brush or wire broom, or by other means approved by the engineer. Immediately before newconcrete is placed, all construction joints must be wetted and standing water removed.

31–10(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

14.

National Standard Construction Specification

Part 642 National Engineering Handbook

Expansion and contraction joints

Expansion and contraction joints must be made only at locations shown on the drawings. Exposed concrete edges at expansion andcontraction joints must be carefully tooled or chamfered, and the joints must be free of mortar and concrete. Joint filler must be fully
exposed for its entire length with clean and true edges.
Where open joints or weakened plane “dummy” joints are specified, joints formed in fresh concrete must be constructed by theinsertion and subsequent removal of a wood strip, metal plate, or other suitable template. This must be done so that the corners of theconcrete do not chip or break. The edges of the fresh concrete at the joints must be finished with an edging tool before the joint strips
are removed. Open joints or weakened plane dummy joints may also be saw-cut joints conforming to the depth and extent specified.
Preformed expansion joint filler must be held firmly in the correct position as the concrete is placed.

15.

Waterstops

16.

Removal of forms, supports, and protective coverings

Waterstops must be held firmly in the correct position as the concrete is placed. Joints in metal waterstops must be brazed or welded.
Joints in rubber or plastic waterstops must be cemented, welded, or vulcanized as recommended by the manufacturer. Joints must be
watertight and of a strength equivalent to that specified in Material Specification 537. Intersecting waterstop joints must be
prefabricated and supplied by the same manufacturer providing the waterstop.
Forms, supports, and protective coverings must be removed as soon as practical after the concrete has gained sufficient strength tosupport its own weight and superimposed loads. Removal must be done so that the concrete surface is not damaged and sudden orexcessive stresses are not induced. The minimum period from completion of the concrete placement to the removal of the forms must
be based on either strength tests or cumulative times.
Strength tests—The strength of the in-place concrete is determined by testing concrete cylinders specifically cast for this purpose andcured adjacent to the member in accordance with the ASTM C31 method for determining removal time. Unless otherwise specified,forms supporting the weight of the concrete member may be removed after the concrete strength is 70 percent of that specified for theclass of concrete. Forms not supporting the weight of the concrete member or other superimposed loads may be removed after theconcrete strength has reached the strength specified in section 25.
Cumulative time—The total accumulated time, not necessarily continuous, that the air adjacent to the concrete is above 50 degrees
Fahrenheit and the specified concrete curing has occurred concurrently will be determined. Forms may be removed after the total
accumulated time shown:

Accumulated form removal times
Forms

Time 1/

Sides of slabs or beams

12 hours

Undersides of slabs or beams

Sides of walls or columns

Clear span2/

< 10 ft.

4 days

10 - 20 ft.

7 days> 20 ft.

14 days

Height above form

3/ 4/(210-VI-NEH, Amend 2, Sept. 2018)

31–11

Chapter 2

National Standard Construction Specification< 10 ft.

12 hours< 20 ft.

24 hours> 20 ft.

72 hours

Part 642 National Engineering Handbook

1/ Table values apply to normal concrete. Values for concrete that contains cements or admixtures thatsignificantly retard or accelerate strength gain will be determined by the engineer and based on actual design
mix data.
2/ Values apply to members designed to support significant superimposed loads. Values for members designed
for only self-weight when placed in service must be 50 percent greater.
3/ Values apply to members not subject to significant horizontal loads. Additional time or re-bracing is needed
for members subject to significant wind or other horizontal loads.
4/ Subsequent higher lifts may be placed after 12 hours.

17.

Finishing formed surfaces

All formed concrete surfaces must be true and even, and must be free from over-tolerance depressions, holes, projections, bulges, orother defects in the specified surface finish or alignment, unless otherwise specified in section 25. Depressions are measured as the
distance from the bottom of a 5-foot-long template or straight edge.
A surface to be backfilled or otherwise concealed when construction is completed must have the following surface treatment unlessotherwise specified:• Repair defective concrete.
• Fill all form tie holes.
• Correct surface depressions deeper than 1 inch.
• Remove or smooth fins and abrupt projections that exceed 0.75 inch.
A surface to be permanently exposed, where other finishes are not specified, must have the following treatment:• Repair defective concrete.
• Fill all form tie holes.
• Remove or smooth all abrupt irregularities greater than 0.25 inch in depth or projection.
• Treat all depressions and irregularities so that they do not exceed 0.5 inch in depth.
Form bolt and tie holes and other holes of similar size and depth must be repaired and filled as specified in section 20.

18.

Finishing unformed surfaces

All exposed surfaces of the concrete must be accurately screeded to grade and then float finished unless otherwise specified. The float
finish must result in a surface that has no irregularities of more than 0.25 inch when checked with a template or straight edge that is 10
feet long.
All exposed surfaces of concrete must be accurately struck off to grade after placement and consolidation are completed. Following
strikeoff, the surface must be immediately smoothed by darbying or bull floating before any free water has bled to the surface. The
concrete must then be allowed to rest until the bleed water and water sheen have left the surface and the concrete has stiffened towhere it will sustain foot pressure with only about 0.25-inch indentation. At this time all joints and edges that are exposed to view andare not chamfered must be finished with edging tools. After edging and hand jointing is complete, all exposed surfaces must be floatedwith wood or magnesium floats. The floating should work the concrete no more than necessary to remove screed, edger, and jointermarks and to produce a compact surface uniform in texture.
Water must not be sprinkled or added to the surface of the concrete during the darbying, bull floating, floating, or other finishing
operations to facilitate finishing.
31–12(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

19.

National Standard Construction Specification

Part 642 National Engineering Handbook

CuringFreshly placed concrete must be cured a minimum of 7 days in accordance with the recommended practices set forth in this section. A
curing process must be started as soon as the concrete has hardened sufficiently to prevent surface damage. Curing concrete, including
exposed surfaces of formed concrete and concrete in forms, must be maintained at a satisfactory moisture content for at least 7 days
following placement. If forms are removed before the end of the 7-day curing period, the interrupted curing process must bereestablished and maintained until a full 7-day curing period is achieved. A satisfactory moisture condition is—• Continuous or frequent application of water or use of a saturated cover material, such as canvas, cloth, burlap, earth, or sand.
• Prevention of excessive water loss from the concrete by use of an impermeable coating (curing compound) or covering(plastic, paper).
The application of water or covering must not erode, mar, or otherwise damage the concrete. Plastic film or paper must meet therequirements of ASTM C171. Black covering must not be used when concreting in hot weather.
Except as otherwise specified in section 25, curing compound may be used for exposed surfaces or formed surfaces after patching andrepair are completed. Curing compounds must not be used on a surface that is to receive additional concrete, paint, tile, or othercoatings unless the contractor demonstrates that the membrane can be satisfactorily removed or can serve as a base for the later
application.
Curing compound must be thoroughly mixed before applying and be agitated during application. Except as otherwise specified in
section 25, the compound must be applied at a pressure of 75 to 100 pounds per square inch. A continuously agitating pressure sprayer
is used for application at a uniform rate of not less than 1 gallon per 175 square feet of surface. Manual hand pump sprayers must not
be used for curing concrete surfaces exceeding 400 square feet unless otherwise specified. For individual concrete placements or
repairs having a surface area of 400 square feet or less, curing compound may be applied with a soft-bristled brush, paint roller, or
hand sprayer. The compound must form a uniform, continuous, adherent film that must not check, crack, or peel and must be freefrom pinholes or other imperfections.
All surfaces covered with curing compound must be continuously protected from damage to the protective film during the required
curing period.
A surface subjected to heavy rainfall or running water within 3 hours after the compound has been applied or that is damaged bysubsequent construction operations during the curing period must be resprayed in the same manner as for the original application.
Water for curing must be clean and free from any substances that cause discoloration of the concrete.

20.

Concrete patching, repair or replacement

Patching—All form bolts, metal ties, and similar forming restraints must be removed to a depth of 1 inch below the surface of theconcrete and their cavities repaired unless otherwise specifically permitted or specified. Small cavities, large air holes, minor
honeycombed areas, and other superficial imperfections that require patching to meet the specified finish requirements must be
thoroughly cleaned and filled. Holes left by bolts or straps that pass through the concrete section must be filled solid with a dense,
well-bonded, non-shrink patching material. Dry-pack mortar and replacement concrete must follow the appropriate procedure detailed
in the “Repair and Maintenance” chapter of the Concrete Manual, Bureau of Reclamation, U.S. Department of the Interior. Proprietary
patching material must be appropriate for the type of repair, used within the manufacturer's recommended limits, and applied
according to the manufacturer's recommendations.
Repair or replacement—The contractor must repair or replace concrete that does not meet the requirements of this specification.
Before starting any repair or replacement work, the contractor must prepare a written plan for the repair or replacement. The primaryreference for material and repair methods for the plan must be the appropriate sections of the “Repair and Maintenance” chapter of theConcrete Manual, Bureau of Reclamation, U.S. Department of the Interior. The repair plan must be submitted to the engineer for
review at least 10 days before any repair or replacement work. Approval of the plan will be authorized in writing by the contracting
officer.
When proprietary patching material is proposed in the plan, the manufacturer's data sheets and written recommendations must be
included in the plan.
(210-VI-NEH, Amend 2, Sept. 2018)

31–13

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Repair material or replacement concrete must have properties, color, and texture similar to and compatible with the concrete being
repaired or replaced. Repair or replacement concrete work may only be performed when the engineer is present.
Curing of repaired or replaced concrete must be started immediately after finish work is completed and as specified in section 19 or as
specified by the manufacturer of proprietary compounds.

21.

Concreting in cold weather

Methods for concreting in cold weather must be performed when, for more than 3 consecutive days, the following conditions exist:• The average daily air temperature at the job site is less than 40 degrees Fahrenheit. (The average daily air temperature is theaverage of the highest and lowest temperatures occurring during the period from midnight to midnight.)• The air temperature at the job site is less than, or equal to, 50 degrees Fahrenheit for more than half of any 24-hour period.
Concrete must be protected against freezing during the first 24 hours after placement whether or not the average weather conditions
specified above for cold weather concreting exist. The following provisions also apply unless otherwise specified:a. When the cement is added to the mix, the temperature of the mixing water must not exceed 140 degrees Fahrenheit nor thetemperature of the aggregate exceed 150 degrees Fahrenheit.
b. The temperature of the concrete at the time of placing must be within the placement temperature range shown below, unlessotherwise specified.
Least dimension of section, inches

Placement temperature, °F

Less than 12

55 – 75

12 to 36

50 – 70

36 to 72

45 – 65

Greater than 72

40 – 60c. The minimum temperature of the concrete for the first 72 hours after placement must not be less than the minimum
temperature shown above. Concrete structures must be immediately protected after concrete placement by covering, housing,insulating, or heating concrete structures sufficiently to maintain the minimum temperature adjacent to the concrete surface. If
the minimum temperature requirements are not met and the concrete did not freeze, the protection time will be extended aperiod equal to twice the number of hours the temperature was below the minimum temperature.
d. Exhaust flue gases from combustion heaters must be vented to the outside of the enclosure. The heat from heaters and ducts
must be directed in such a manner as to not overheat or dry the concrete in localized areas or to dry the exposed concretesurface.
e. At the end of the protection period, the concrete must be allowed to cool gradually. The maximum decrease at the concretesurface in a 24-hour period must not exceed 40 degrees Fahrenheit.

22.

Concreting in hot weather

Methods for concreting in hot weather must be in accordance with the requirements set forth below.
For the purpose of this specification, hot weather is defined as the weather condition at the jobsite that causes acceleration in the rateof moisture loss or rate of cement hydration of freshly mixed concrete, including an ambient temperature of 80 degrees Fahrenheit or
higher, and an evaporation rate that exceeds 0.2 pounds per square foot per hour. The rate of moisture loss and rate of cement
hydration may be accelerated if one or a combination of the following conditions exists:
31–14(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook• High ambient temperature• High concrete temperature• Low relative humidity• Wind velocity• Solar radiation
Whenever the above conditions exist or when climatic conditions are such that the temperature of the concrete may reasonably be
expected to exceed 90 degrees Fahrenheit at the time of delivery to the worksite or during the placement operations, the following
provisions apply:
a. The contractor must maintain the temperature of the concrete below 90 degrees Fahrenheit during mixing, conveying, andplacing.
b. Exposed concrete surfaces that tend to dry or set too rapidly must be continuously moistened using fog sprays or other means
to maintain adequate moisture during the time between placement and finishing. Water must not be sprinkled or added directly
to the surface of the concrete before finishing.
c. Finishing of slabs and other exposed surfaces must be started as soon as the condition of the concrete allows and must becompleted without delay. Water must not be sprinkled or added to the surface of the concrete during the darbying, bull
floating, floating, or other finishing operations to facilitate finishing.
d. Formed surfaces must be kept completely and continuously wet from the time the concrete takes initial set to when the forms
are removed. After the forms are removed, the concrete surfaces must be kept completely and continuously wet for theduration of the curing period or until curing compound is applied in accordance to section 21.
e. Exposed and unformed concrete surfaces, especially flat work placed with large areas of surface, must be kept completely andcontinuously wet for the duration of the curing period or until curing compound is applied in accordance to section 19. The
concrete must be protected against thermal shock from rapid cooling (5°F per hour or more than 40°F per 24-hour period) of
the concrete by application of curing water or temperature changes during the first 24 hours of the curing period.
f. When any single or combination of conditions might result in very rapid setting or drying of the concrete, extreme conditions
exist. For flat work and slab construction, extreme conditions exist when the evaporation rate exceeds 0.2 pound per squarefoot per hour. The engineer may—
(1) Restrict placement to the most favorable time of the day.
(2) Restrict the depth of layers to assure coverage of the previous layer while it will still respond readily to vibration.
(3) Suspend placement until conditions improve.
(4) Restrict the removal of forms, repair, and patching to small areas that can be protected with curing compound
immediately.
The evaporation rate for flat work and slab construction may be determined by calculating the evaporation rate from a cake pan having
a surface area of at least 1 square foot or by other methods approved by the engineer or designated in section 25.

23.

Acceptance of the concrete work

Acceptance of the concrete work will be a cumulative acceptance process based upon progressively meeting the requirements of thespecifications and drawings for—• Fresh concrete.
• Concrete strength and durability.
• Structure dimensions.
• Structure appearance.
Fresh concrete—Fresh concrete conforming to the mix proportions and quality requirements of the approved job mix and thehandling and placement requirements of previous sections will be satisfactory.
Concrete strength—A strength test is the average of the compressive strengths of two standard cured cylinders prepared and tested inaccordance with section 4, unless otherwise specified. The strength of the hardened concrete is satisfactory if the following
requirements are met:
(210-VI-NEH, Amend 2, Sept. 2018)

31–15

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

a. If method 1 from section 3 is specified and the concrete work is less than 75 total cubic yards for the class of concrete
specified, the compressive strength of the concrete is satisfactory if no individual strength test falls more than 500 pounds per
square inch below the specified compressive strength (f 'c) for the respective class of concrete.
b. If method 1 from section 3 is specified and the concrete work is 75 total cubic yards or more for the class of concrete
specified, the compressive strength of the concrete is satisfactory if both of the following requirements are met:
(1) No individual strength test falls more than 500 pounds per square inch below the specified compressive strength (f 'c) forthe class of concrete specified.
(2) The average of any three consecutive strength tests is not less than the specified compressive strength (f 'c) for the class ofconcrete specified.
The contractor must take steps to increase the average of subsequent strength tests when the average of any three consecutive
strength tests falls below the specified concrete strength (f 'c).
c. The engineer determines the structural adequacy and evaluates the durability of the in-place concrete when the concrete
strength based on the standard cured concrete cylinders is unsatisfactory. The engineer determines the need for additional
quality assurance testing.
d. The contractor may core the concrete, have the cores tested by a certified testing laboratory at the contractor's expense, andsubmit test results to the engineer for consideration and evaluation of concrete strength adequacy when the concrete strength
based on the standard cured concrete cylinders is unsatisfactory.
e. Sampling and testing concrete by coring must conform to section 4. The strength of the concrete based upon concrete cores issatisfactory if both of the following requirements are met:
(1) The average compressive strength of the three cores equal or exceed 85 percent of the specified compressive strength(f 'c).
(2) The compressive strength of any individual core does not fall below 75 percent of the specified compressive strength(f 'c).
f. If method 2 from section 3 is specified, the engineer is responsible for the concrete job mix design and the quality concretethat results from the job mix.
The hardened concrete is satisfactory if the required batch tickets or other documentation acceptable to the engineer clearlyshow that the batch ingredients and weights of each ingredient including all admixtures conforms to the job mix provided by
the engineer. Random periodic inspection of the batching operations may be made by the engineer to verify that ingredientsand ingredient proportions conform to the batching documentation.
If the concrete ingredients, proportions, or admixtures varies from the job mix provided by the engineer, the concrete may berejected if, in the judgment of the engineer, the variance will significantly affect the strength or durability of the concrete or
will adversely affect the life expectancy or other components of the structure.

Structure dimensions and appearance

The appearance of the concrete must meet the requirements of sections 17 and 18.
The dimensions of formed members, unless otherwise specified, are satisfactory if they conform to the requirements of thespecifications, the locations shown on the drawings, and are within acceptable tolerances:a. Variation from plumb for walls and column must be no more than 0.2 percent of the total wall or column height.
b. Variation from specified elevations for slabs, floors, or other horizontal members must be no more than 0.2 percent of thelength of the member in the direction of grade.
c. Variations in the cross-sectional dimensions of columns and beams and in the thickness of walls and above-grade slabs must
be no more than minus 0.25 inch or plus 0.5 inch from the shown dimensions.

24.

Measurement and payment

For items of work for which specific unit prices are established in the contract, concrete is measured to the neat lines or pay limits
shown on the drawings, and the volume of concrete is computed to the nearest 0.1 cubic yard. No deduction in volume is made forchamfers, rounded or beveled edges, or for any void or embedded item that is less than 5 cubic feet in volume. Where concrete is

31–16(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

placed against the sides or bottom of an excavation without intervening forms, drainfill, or bedding, the volume of concrete required tofill voids resulting from over-excavation outside the neat lines or pay limits is included in the measurement for payment where suchover-excavation is directed by the engineer to remove unsuitable foundation material. However, this payment is only to the extent thatthe unsuitable condition is not a result of the contractor's improper construction operations, as determined by the engineer.
Method l—Payment for each item of concrete is made at the contract unit price for that item. The payment for concrete will constitutefull compensation for completion of the concrete work, including joint fillers, waterstops, dowels or dowel assemblies, and metal
plates, but not including reinforcing steel or other items listed for payment elsewhere in the contract.
Method 2—Payment for each item of concrete is made at the contract unit price for that item. The payment for concrete constitutes
full compensation for completion of the concrete work, including joint fillers, waterstops, metal plates, dowels, and other assemblies.
It does not include furnishing and placing reinforcing steel or furnishing and handling cement or other items listed for payment
elsewhere in the contract.
Cement is measured by dividing the volume of concrete accepted for payment by the yield of the applicable job mix. The yield isdetermined by the procedure specified in ASTM C138. If the amount of cement actually used per batch exceeds the amount in the jobmix specified by the engineer, the measurement is based on the amount of cement specified by the engineer for the job mix. Unlessotherwise stated in section 25, a bag of cement is considered 94 pounds. Payment for each type of cement will be made at the contract
unit price for furnishing and handling that type of cement and such payment will constitute full compensation for furnishing andhandling the cement.
All methods—The following provisions apply to all methods of measurement and payment. Compensation for any item of work
described in the contract, but not listed in the bid schedule, will be included in the payment for the item of work to which it is makesubsidiary. Such items and the items to which they are made subsidiary are identified in section 25 of this specification.

25.

Items of work and construction details(210-VI-NEH, Amend 2, Sept. 2018)31–17

25. Items of Work and Construction Details
Concrete items installed in conformance with this specification shall be of concrete made withType II/V cement. Class 2 coarse aggregate shall be Size No. 7, 57, 67, or 467. Bituminous
preformed expansion joint filler shall be according to ASTM D994. Sponge rubber expansion
joint filler shall be according to ASTM D1752. The slump range for all concrete shall be 4 inches
plus or minus 1 inch.
In Section 3, Concrete mix design, Method 1 shall apply. All concrete shall equal or exceed Class
4000.
In Section 13, Construction joints, Method 1 shall apply.
In Section 24, Measurement and payment, Method 1 shall apply.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 22, Concrete, Structural(1)

This item shall consist of furnishing and placing all concrete required forconstruction of the concrete principal spillway inlet and outlet structure, and theauxiliary spillway concrete baffle blocks, stilling basin end sill, and upstream anddownstream cut off walls, as shown on the drawings.

(2)

In addition to the finishing of all formed concrete surfaces and slabs inconformance with Section 17 of this specification, all concrete surfaces that will be
exposed to air and water, shall be finished by (1) a complete carborundum stone
rubbing or (2) by treatment with a cement-based heavy-duty coating such as"MasterSeal 581" manufactured by Master Builder Solutions. A product of equalquality may be used. The coating material to be used shall be approved by theEngineer.
(a)

The cement-based coating shall be in powder form, free from lumps or
aggregates, and easily dispersed in water to a smooth and homogeneousconsistency. The coating shall be suitable for application to wetted
masonry or concrete surfaces with a fiber brush, roller, or special sprayequipment.

(b)

The coating materials shall be heavy-bodied with ability to fill and seal
pores and voids and provide a waterproof finish. The coating material shallbe applied in such a manner that all cavities or surface pits, pockmarks, orholes not filled as otherwise specified are completely filled with the surface
finish of coating materials.

(c)

Products applied as surface finish shall be applied in conformance with the
manufacturer's recommendations with the additional requirement that all
concrete surfaces shall be cleaned by wet or dry sandblasting, steam
cleaning, or other approved method that insures a clean surface to which
the surface finish product readily adheres and which is free of all

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

31-18

unsatisfactory concrete, laitance, coatings, stains, and debris that would
prevent the coating from adhering tightly to the prepared concrete surfaces.

(3)

(d)

The surface finish shall present a uniform appearance and shall be free ofcheck marks, blisters, cracking, and other evidence of non-uniformity,
inconsistencies, and imperfections. Such area(s) of non-uniformities,
checks, blisters, cracks, and other imperfections shall be removed, and thesurface finish reapplied to present uniform appearance in accordance withthe requirements of this section.

(e)

The color of the final cured coating shall conform to the MasterSeal color“Gray”.

(f)

The coating shall meet the following specifications:
1)Compressive Strength – 4,200 psi in 7 days, 6030 psi in 28 days
(Test Method ASTM C109).

2)

Tensile Strength -- 250 psi in 7 days, 440 psi in 28 days (Test
Method ASTM C190).

3)

Flexural Strength -- 360 psi in 7 days, 1027 psi in 28 days (Test
Method ASTM C348).

4)

The coating shall dry to the touch in 4 hours and hard-dry within
48 hours (ASTM C1640).

5)

Freeze-Thaw Cycling -- No cracking or declamation after 200
cycles (Test Method ASTM C666, Method B).

6)

Weatherometer -- After 5000 hours of weatherometer exposure,there shall be no checking, cracking, or loss of adhesion, and thedegree of chalking shall be No. 8 (ASTM D822 and ASTM G26).

7)

Resistance to wind-driven rain – after 8 hours exposure rated as
excellent as per Federal Specification (TT-P-0035).

The item of work subsidiary to this bid item is Excavation, Common, Concrete
Structures as specified in Construction Specification 21 as it applies to this bid
item.

b. Bid Item 23, Concrete, Pipe Cradle(1)

This item shall consist of furnishing and placing all concrete required for theconstruction of the principal spillway conduit cradle as shown in the construction
drawings.

(2)

The item of work subsidiary to this bid item is Excavation, Common, Concrete
Structures as specified in Construction Specification 21 as it applies to this bid
item.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

31-19

c. Subsidiary Item, Establishment of Permanent Reference Markers (PRM)(1)

This item shall consist of all work and materials (except the benchmark caps)
required for the establishment of permanent reference markers (PRM) shown on
the drawings. The caps for the PRM will be furnished by the NRCS prior to
casting/pouring the concrete.

(2)

The required number and approximate locations of the markers are shown on thedrawings. The actual location of the markers shall be as staked by the Contractor’ssurveyor.

(3)Markers shall be cast in place, non-reinforced, concrete cylinders or precast, nonreinforced, concrete cylinders installed flush with the ground line and with astandard benchmark cap mounted on the top.

(4)

The concrete cylinder shall have a minimum diameter of 10 inches and depth of 2feet, except a lesser depth may be approved by the Engineer where rock is
encountered. Earth forming will be permitted for cast-in-place markers.

(5)

No surface finish will be required for that portion of the marker which will be
below ground. If precast markers are used, backfill shall be thoroughly tamped in
4-inch layers.

(6)

Separate payment will not be made for this item. Compensation for this item will
be included in the payment for the bid item Construction Surveys.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

31-20

Chapter 2

National Standard Construction Specifications

Part 642 National Engineering Handbook

Construction Specification 34—Steel Reinforcement
1.

Scope

2.

Material

3.

Bar schedule, lists and diagrams

4.

Bending5.

Splicing bar reinforcement

The work consists of furnishing and placing steel reinforcement for reinforced concrete or pneumatically applied mortar.
Steel reinforcement must conform to the requirements of Material Specification 539, Steel Reinforcement (for concrete).
Before reinforcement is placed, the surface of the bars and fabric and any metal supports must be cleaned to remove any loose,flaky rust, mill scale, oil, grease, or other undesirable coatings or foreign substances. Epoxy-coated steel reinforcement must
be free of surface damage. After placement, the reinforcement must be maintained in a clean and serviceable condition until it
is completely embedded within the concrete.
Any supplemental bar schedules, bar lists or bar-bending diagrams required in section 10 of this specification to accomplish
the fabrication and placement of steel reinforcement must be provided by the contractor. Before reinforcement is placed, thecontractor must furnish four copies of any such lists or diagrams to the contracting officer for approval. Acceptance of thereinforcement is not based on approval of these lists or diagrams, but on inspection of the steel reinforcement after it has beenplaced, tied, and supported and is ready to receive concrete.
Reinforcement must be cut and bent in compliance with the requirements of the American Concrete Institute Standard 315.
Bars must not be bent or straightened in a manner that will injure or weaken the material. Bars with kinks, cracks, or
improper bends must be rejected.
Method 1—Splices of reinforcement may only be made at locations shown on the drawings and provided by the steelschedule. Placement of bars at the lap splice locations shown, when not in contact, must not be farther apart than one-fifth theshown lap length and in any case no greater than 6 inches.

Method 2—Splices of reinforcement must be limited to those locations shown on the drawings. Splice lengths must be
determined before fabrication and meet the requirements of ACI Standard 318, Building Code Requirements for Reinforced
Concrete, based upon design information in section 10 of this specification. Bar placement drawings and schedules must be
provided for approval before fabrication. The drawings must show all splice locations, layouts, and lap dimensions.

6.

Splicing welded wire reinforcement

Unless otherwise specified, welded wire reinforcement must be spliced in the following manner:

End-to-end—Adjacent sections must be spliced end-to-end (longitudinal lap) by overlapping a minimum of one fullmesh plus 2 inches plus the length of the two end overhangs. The splice length is measured from the end of thelongitudinal wires in one piece of fabric to the end of the longitudinal wire in the lapped piece of fabric.

7.

Side-to-side—Adjacent sections must be spliced side to side (transverse lap) a minimum of one full mesh plus 2
inches. The splice length must be measured from the centerline of the first longitudinal wire in one piece of fabric tothe centerline of the first longitudinal wire in the lapped piece of fabric.

Placing

Reinforcement must be accurately placed and secured in position to prevent its displacement during the placement of
concrete. Tack welding of bars is not permitted. Metal chairs, metal hangers, metal spacers, and concrete chairs may be used tosupport the reinforcement. Metal hangers, spacers, and ties must be placed in such a manner that they are not exposed in thefinished concrete surface. The legs of metal chairs or side form spacers that may be exposed on any face of slabs, walls, beams,
or other concrete surfaces must have a protective coating or finish. The coating or finish must be hot dip galvanized, epoxy
coated, plastic coated, or stainless steel. Metal chairs and spacers not fully covered by a protective coating or finish must havea minimum cover of 0.75 inch of concrete over the unprotected metal part. The exception is that those with plastic coatings
may have a minimum cover of 0.5 inch of concrete over the unprotected metal part. Precast concrete chairs must be(210-VI-NEH, Amend. 2, Sept. 2018)

34–1

Chapter 2

National Standard Construction Specifications

Part 642 National Engineering Handbook

manufactured of the same class of concrete as specified for the structure and must have the tie wires securely anchored in thechair or a V-shaped groove at least 0.75 inch in depth molded into the upper surface to receive the steel bar at the point of
support. Precast concrete chairs must be clean and moist at the time concrete is placed.
High-density or structural plastic rebar accessories designed to ensure maximum concrete bond may be substituted for metal
or concrete accessories in spacer applications as approved by the contracting officer. Exposure of plastic rebar accessories at
the finished concrete surface must be kept to a minimum. Plastic rebar accessories, when used, must be staggered alongadjacent parallel bars and must be placed at intervals no closer than 12 inches. Plastic rebar accessories must not be used inconcrete sections 6 inches or less in thickness.
Reinforcement must not be placed until the prepared site has been inspected and approved. After placement of thereinforcement, concrete must not be placed until the reinforcement has been inspected and approved by the responsible
engineer.

8.

Storage

9.

Measurement and payment

Steel reinforcement stored at the work site must be placed on platforms, skids, or other supports. This is done so that contact
with the ground is avoided and the material is protected from mechanical damage and/or corrosion.
Method 1—For items of work for which specific unit prices are established in the contract, the weight of steel reinforcement
placed in the concrete in accordance with the drawings is determined to the nearest pound by computation from the placingdrawings. Measurement of hooks and bends is based on the requirements of ACI Standard 315. Computation of weights ofreinforcement is based on the unit weights established in tables 34–1 and 34–2 of this specification. Computation of weights
for welded wire reinforcement not shown in table 34–2 must be based on ACI Standard 315. The area of welded wire
reinforcement placed in the concrete in accordance with the drawings is determined to the nearest square foot bycomputation from the placing drawings with no allowance for required laps. The weight of steel reinforcing in extra splices orextra-length splices approved for the convenience of the contractor or the weight of supports and ties is not included in themeasurement for payment.
Payment for furnishing and placing reinforcing steel is made at the contract unit price. Such payment constitutes fullcompensation for all labor, material, equipment, and all other items necessary and incidental to the completion of the work
including preparing and furnishing bar schedules, lists, or diagrams; furnishing and attaching ties and supports; andfurnishing, transporting, storing, cutting, bending, cleaning, and securing all reinforcements.

Method 2—For items of work for which specific unit prices are established in the contract, the weight of bar reinforcement
placed in the concrete in accordance with the drawings is determined to the nearest pound by computation from the placingdrawings. Measurement of hooks and bends is based on the requirements of ACI Standard 315. Computation of weights of bar
reinforcement is based on the unit weights established in table 34–1 of this specification. The weight of steel reinforcing in
extra splices or extra length splices approved for the convenience of the contractor or the weight of supports and ties is notincluded in the measurement for payment.
The area of welded wire reinforcement placed in the concrete in accordance with the drawings is determined to the nearest
square foot by computation from the placing drawings with no allowance for required laps.

Payment for furnishing and placing bar reinforcing steel is made at the contract unit price for bar reinforcement. Payment for
furnishing and placing welded wire reinforcing steel is made at the contract unit price for welded wire reinforcement. Such
payment constitutes full compensation for all labor, material, equipment, and all other items necessary and incidental to thecompletion of the work including preparing and furnishing bar schedules, lists, or diagrams; furnishing and attaching ties andsupports; and furnishing, transporting, cutting, bending, cleaning, and securing all reinforcement.

All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any item ofwork described in the contract, but not listed in the bid schedule, is included in the payment for the item of work to which it ismade subsidiary. Such items to which they are made subsidiary are identified in section 10 of this specification.
34–2(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specifications

Table 34–1

Standard reinforcing bars

EnglishMetric

3

10

0.376

5

16

1.043

- - Bar size designations - -

4
6
7
8
9

10
11
14
18

13
19
22
25
29
32
36
43
57

Part 642 National Engineering Handbook

Weight (lb/ft)

0.668
1.502
2.044
2.670
3.400
4.303
5.313
7.650

13.600

1/ The bar diameter (inches) equals the bar size number divided by eight. For example, the diameter of a #4 bar is 4 ÷ 8 = 0.5 inch.
2/ The metric bar size has been rounded to a whole number that represents the approximate diameter of the bar in millimeters.

(210-VI-NEH, Amend. 2, Sept. 2018)

34–3

Chapter 2

Table 34–2

National Standard Construction Specifications

Rectangular welded wire reinforcement- - - - - - - - - - Style designation 1/ - - - - - - - - - -Weightby W-number

by steel wire gauge(lb/100 ft2)
(former designation)

6 × 6 – W1.4 × W1.4

6 × 6 – 10 × 10

21

6 × 6 – W2.9 × W2.9

6×6–6×6

42

6 × 6 – W2.1 × W2.1
6 × 6 – W4.0 × W4.0
4 × 4 – W1.4 × W1.4
4 × 4 – W2.1 × W2.1
4 × 4 – W2.9 × W2.9
4 × 4 – W4.0 × W4.0

4 × 12 – W2.1 × W0.9 2/
4 × 12 – W2.5 × W1.1 2/

6×6–8×8
6×6–4×4

4 × 4 – 10 × 10
4×4–8×8
4×4–6×6
4×4–4×4

4 × 12 – 8 × 12
4 × 12 – 7 × 11

30
58
31
44
62
85
25
31

1/ Style designation is defined in ACI Standard 315 of the American Concrete Institute.
2/ Welded smooth wire reinforcement with wires smaller than size W1.4 is manufactured from galvanized wire.

10. Items of work and construction details

34–4(210-VI-NEH, Amend. 2, Sept. 2018)

Part 642 National Engineering Handbook

10. Items of Work and Construction Details
In Section 5, Splicing bar reinforcement, Method 1 shall apply.
In Section 7, Placing, if during the placement of the concrete any reinforcement is displaced morethan ½ inch from its designated position, that reinforcement shall be entirely removed and placed
in proper position. Inspection and approval of the reinforcement by the Engineer will not relieve
the Contractor of the responsibility of ensuring the reinforcement is held in place and is not
displaced during the placement of the concrete.
In Section 9, Measurement and payment, Method 1 shall apply.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 24, Reinforcing Steel(1)

This item shall consist of furnishing and placing all steel reinforcement required forthe construction of all reinforced concrete works under this contract.

(2)

Reinforcing steel shall be minimum Grade 60.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

34-5

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

34-6

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Construction Specification 36—Roller Compacted Concrete
1.

Scope

The work consists of furnishing all materials, tools, equipment, and mixing plant and performing all labor for the mixing, transporting,forming, placing, compacting, and curing of roller compacted concrete (RCC) as required to install the structure(s) as shown on thedrawings and designated in section 22 of this specification and the test section designated in the same section.
The following BioPreferred® product category is applicable to this specification:— Concrete release fluids (a.k.a., form-release agents)

2.

Material

Portland cement must conform to the requirements of Material Specification 531, portland cement. Type-III portland cement must not
be used.
Pozzolan must conform to the requirements of Material Specification 532, Supplementary Cementitious Materials. Fly ash must beclass F unless otherwise specified. The source of pozzolan must consistently supply material with similar chemical and physicalproperties.
Combined aggregates must conform to the requirements of Material Specification 524, Aggregates for Roller Compacted Concrete,unless otherwise specified.
Water incorporated into the mix or used for curing RCC must be clean and free from injurious amounts of oil, salt, acid, alkali,organic matter, turbidity, or other deleterious substances. Water must conform to the requirements of ASTM C 94 except that washwater may not be used for mixing RCC.
Water-reducing, set-retarding admixture must conform to ASTM C494, type D.
Curing compound must conform to the requirements of Material Specification 534, Concrete Curing Compound. Curing compound
must be furnished in containers that have not been previously opened and that have the original manufacturer’s labels attached.
Bonding mortar must consist of cement, sand, water, and a water-reducing, set-retarding admixture to retard the set and control theconsistency of the mortar. The cement, water, and admixture must be as specified. Sand must comply with ASTM C33 for fineaggregate. The mortar must be mixed in the proportions 1 part cement to 2.5 parts sand, by weight. Water content must be sufficient toprovide a spreadable consistency. In combination with the admixture, the maximum water-to-cementitious materials ratio must be
0.45. The mortar slump must be 7 to 9 inches when tested in accordance with ASTM C143. The admixture must be included at the
manufacturer’s recommended dosage so that the initial set time is retarded at least 3 hours when the ambient air temperature is 95
degrees Fahrenheit.
Material testing—The contractor must test materials or provide certified test results to ensure all materials conform to the specified
requirements. All nonconforming materials must be promptly removed from the job site, including those that have been incorporated
into the work.
Aggregate sampling must be in accordance with ASTM D75.
Aggregate samples must be taken from stockpiles, belt feeders from bins, the mix plant feed conveyor belts, the mixer feed conveyer
belt, or from the pug mill discharge while only aggregate is discharged from the pugmill.
When obtaining aggregate samples from stockpiles, samples must be obtained from various parts of the stockpiles, but never from theperimeter of the lower third of the pile.
The contractor must provide access for material sampling and performance of quality assurance testing activities at material storagesites.

(210-VI-NEH, Amend. 2, Sept. 2018)

36–1

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Sampling—The contractor must provide suitable platforms, tools, equipment, and labor necessary for obtaining representative
samples of materials to be used for the contractor's quality control testing and for the Government's quality assurance testing. Samples
may be taken from stockpiles, aggregate bins and feed belts, entrance to the mixer, mixer discharge, gob hopper discharge, points intransit, or the placement area.
Material handling and processing—Transportation of cement and pozzolan to the batching plant must be accomplished in weathertight trucks, conveyors, or other means that will completely and thoroughly protect the cementitious materials from exposure tomoisture and contaminants.
The temperature of cement and pozzolan when delivered to the job site must not exceed 160 degrees Fahrenheit. The temperature of
the cement and pozzolan must be determined by direct insertion of a thermometer into the material in the delivery truck. The
temperature of air to transport cement into storage containers or silos must not exceed 180 degrees Fahrenheit. It may be assumed thatthe temperature of the air in the transfer pipe is the same as the temperature on the outside surface of the transport pipe. The
temperature of the air must be determined by measuring the temperature on the outside of the transport pipe with a surface
thermometer.
Immediately upon receipt at the job site, cement and pozzolan must be stored in dry, weather-tight, ventilated structures. All storage
facilities must permit easy access for inspection and identification. Sufficient cement and pozzolan must be stored onsite at all times tocomplete a minimum of 24 hours of placement at the planned average production rate, unless otherwise specified. Cement andpozzolan that have been stored at the site for the longest period must be used first, unless otherwise specified.
Aggregates must be transported to the site in two or more components that will be combined in the mix plant to meet the overall
aggregate gradation. Aggregate components must be of a gradation that will minimize segregation prior to introduction into the mixer.
Aggregates must be stored in stockpiles in the designated contractor use area. Aggregate components must be stockpiled separately.
Aggregates must be handled and stockpiled in a manner to prevent intermixing between dissimilar aggregates and to prevent
contamination of the aggregate. Coarse and fine aggregates must remain separated until they are introduced into the mixing plant. For
plants that mix in discrete batches, the coarse and fine aggregates must be fed separately into the batch hopper. For mix plants that mix
continuously, the coarse and fine aggregates must remain separated until they are dropped onto the belt that delivers the aggregates tothe mixing compartment. The contractor must develop and utilize methods that reliably and consistently withdraw and transport theaggregates from the stockpile without contamination or segregation. Segregated or contaminated aggregates must not be used in
production of the RCC and must be disposed of in locations specified in section 22.
A 2-week supply of aggregates, based on the average planned weekly production rate, must be stockpiled at the mixing plant locationor other approved location, prior to RCC production unless otherwise specified.
Sufficient water must be available for mixing and curing to complete a minimum of 24 hours of placement at the average planned
production rate.

3.

Submittals

Manufacturer’s certifications and test reports in no way relieve the contractor of the responsibility for furnishing materials that meetthe specified requirements. Manufacturer’s certifications and test reports must be produced and dated within the 6 months preceding
the delivery of the submittal. The test method used must be noted on all test reports. Any deviation from standard test methods must
be detailed in the test report and the reason for the deviation must be given.
Trial mix production submittals—The submittals listed below must be provided, in writing, for approval no later than 30 days before
trial mix production, unless otherwise specified. Trial mix production must not proceed before approval of these submittals.
a. The name and qualifications of the laboratory that will perform the mix design.
b. The sources from which the cementitious materials will be obtained along with a certified mill test report for each type of
cement, pozzolan, and blended cement that will be used to produce RCC. The certified mill test report must verify that thecement, pozzolan, or blended cement conforms to the applicable material specification.
c. The source from which the aggregate will be obtained and certified test results showing that all aggregates conform to thespecification.

36–2(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

d. The source from which the water will be obtained and the certified test results showing that water to be used in the mix
conforms to ASTM C 94.
e. The source of the admixture along with certified test results showing that the admixture conforms to the specification.
RCC preproduction submittals—The submittals listed below must be provided, in writing, to the engineer for approval. The submittal
for the job mix and bonding mortar must be furnished 30 days before delivery of any RCC or bonding mortar component materials tothe site. The submittal for the plant and equipment, personnel, and test section plan must be provided no later than 30 days before
delivery of the plant or equipment to the site. RCC materials or equipment must not be delivered to the site before approval of thesesubmittals.
Job mix
a. A certified statement of materials, mix proportions (reported for saturated surface dry aggregate), theoretical air-free density(TAFD), moisture/density curves (wet density only), Vebe time, air content, unit weight of mix in air pot just prior to testing
air content, and all compressive strength test results for each of the three mixes required in the development of the RCC job
mix.
b. Gradation of each of the aggregate component and combined aggregates used in each mix developed in the mix design
program.
c. The compacted bulk density and voids in each of the aggregate components and combined aggregates used in each mix
developed in the mix design program.
d. A statement of materials and mix proportions used in each mix developed in the mix design program.
e. A statement of materials and mix proportions proposed to be used in manufacturing the RCC job mix.
Bonding mortar
a. A statement of materials and mix proportions to be used in manufacturing the bonding mortar.
Plant and equipment
a. The planned RCC component material production, transportation, and storage and temperature control procedures. Anticipatedpeak production capacity, normal production capacity, and onsite storage volumes must be included in the plan.
b. Mixing plant manufacturer’s data and operating instructions and the plant layout to include a schematic drawing of the plantand materials storage with a narrative description providing its peak capacity, normal anticipated production rate, and resultsof the most recent uniformity tests conducted within the previous 12 months. The proposed location of the mixing plant
relative to the placement site must be provided.
c. A narrative description and a layout of the equipment and methods to be used for delivering and depositing RCC at theplacement site.
d. The type and expected number of pieces of equipment required for all placing, spreading, and compaction of the RCC.
e. The plan for obtaining the specified vertical surfaces.
f. The method and procedure for curing of the in-place RCC, including the type of curing compound if used.
g. The method and procedure that will be implemented to provide protection of RCC from temperature extremes, including thetype of external heating equipment and insulating materials to be used.
Personnel
a. The names and qualifications of the onsite quality control person, supervisor, and plant operator who will direct the batching,mixing, and placing of RCC.
Test section plana. The contractor’s proposed location for the test section and equipment, materials, personnel, and methods to construct the test
section as specified. The submittal must include plans for the pre- and post-test section briefings.
(210-VI-NEH, Amend. 2, Sept. 2018)

36–3

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Test section submittals—Within 24-hours of completing the tests or test section, the following information must be transmitted to theengineer in writing:a. Results of moisture and density tests used to compute the apparent maximum density (AMD). Include the results of all density
tests made of RCC in the test section.
b. Lift maps of the test section.
c. Results of compressive strength tests.
d. Air content and unit weight of RCC.
e. Production plan that includes RCC production methods, materials, plant, equipment, and personnel as modified based on the
results from the performance of the test section that have been documented to produce RCC that meets the requirements of thespecification.
Unless otherwise specified, 7 days prior to beginning RCC production, submit a final written plan for RCC production methods,
materials, plant, equipment, and personnel that will produce RCC that meets the requirements of this specification.
RCC production submittals—The following submittals must be provided in writing within 24 hours after delivery tickets, records, or
test results are produced, unless otherwise specified:a. Delivery tickets for cement and pozzolan must include the source, date manufactured or produced, type or class, contractor’sname, project name, and a certification that the material meets the specification requirements.
b. Delivery tickets for aggregates must include the source, material description, date, and certification that the material meets the
specification requirements.
c. Delivery tickets for bonding mortar must include name and location of batch plant, ticket number, load and truck number,date, destination, class of cementitious materials, mix proportions, quantity of bonding mortar, time mixer drum charged withcement, and recording of revolution counter (transit-mixed concrete). If bonding mortar is produced on site, the above required
information must be provided as applicable.
d. Records of climatic conditions must be collected on a daily basis and reported on a weekly basis.
e. Mix plant production records and summary of daily material use and RCC produced must be submitted before the start of thenext production shift. Production records must include a comparison of actual materials used to the approved job mix.
f. Results of RCC moisture and wet density tests.
g. Results of uniformity tests.
h. Results of compressive strength tests.
i. Results of RCC temperature tests.
j. Lift maps must be submitted before the start of the next production shift.

4.

Personnel

There must be a supervisor who is responsible for all aspects of the RCC operation and a plant operator who is solely responsible forbatching and mixing. There must be an onsite quality control inspector dedicated to RCC quality control. The supervisor, plant
operator, and quality control inspector must have responsible experience on at least one previous RCC job in the same position forwhich they are being considered for the current job.
There must be at least one person whose sole responsibility is the oversight of the RCC curing activities.

5.

RCC mix design

The contractor is responsible for the mix design and selection of all materials to be used in the design mix. The materials andproportions so stated, when approved, constitute the job mix. The job mix must be prepared to meet the quality, consistency, andstrength of the RCC specified.
The contractor must conduct the mix design program at a materials testing laboratory staffed by American Concrete Institute (ACI)
Certified Grade II Concrete Laboratory Testing Technicians.

36–4(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Trial mix design parameters—The aggregate gradation must be as specified. The bulk density and voids in each of the aggregate
components and the combined aggregate must be determined according to ASTM C 29.
The density, relative density, and absorption must be determined according to ASTM C 127 for coarse aggregate and ASTM C 128 forfine aggregate.
The air content of each mix must be determined according to ASTM C 231. The volume and tare weight of the air pot must be
determined according to ASTM C 138. After consolidating the RCC in the air pot and just prior to testing to determine the air content,
the weight of the RCC and pot must be determined according to ASTM C 138. The density of the RCC that is consolidated in the pot
at the time of testing must be computed.
The minimum compressive strength for the RCC job mix must be as specified in section 22 of this specification.
Unless otherwise specified in section 22—• A minimum of three separate mixes must be developed in the laboratory.
• Pozzolans must comprise at least 20 percent (by volume) but must not exceed 50 percent (by volume) of the cementitious
materials.
• The remainder of the cementitious materials must be comprised of portland cement.
• A compaction curve (wet density only) must be developed for each mix to determine the water content that corresponds to the
maximum wet density of each mix. Compaction tests must be performed in accordance with ASTM D 1557, adapted asfollows:o

The mold specified for Method C must be used.

oAll mix components must be included.

oWhen the maximum size aggregate in the mix is larger than 3/4 inch, place the material in three layers into the mold andcompact each layer with 94 blows of the hammer.

• A Vebe test must be performed on each trial mix design to determine the Vebe consistency time in seconds and the wet
density in pounds per cubic foot. The Vebe test must be performed according to ASTM C 1170. The Vebe consistency timemust range from a minimum of 15 seconds to a maximum of 30 seconds.
Theoretical air free density—The theoretical air free density (TAFD) must be computed for each of the three laboratory mixes in themix design program. The TAFD is the maximum wet density that can be attained for a specific mix assuming there is no air(entrapped or entrained) in the mix. The TAFD must be computed by dividing the sum of the individual weights of the mix
components by the sum of the individual absolute volumes of the mix components. The absolute volume is the volume of the solid
matter in the particles, exclusive of the volume of voids between the particles. The absolute volume of each mix component isdetermined as per ACI 211. The saturated surface dry weight and density of the aggregate must be used when computing the TAFD.
Laboratory compressive strength—Fifteen compressive strength cylinders from each RCC mixture must be prepared in accordancewith ASTM C 1176 or C 1435 and weighed to determine the density of the RCC within each cylinder. Any cylinder that weighs lessthan 98 percent of the weight of the heaviest cylinder must be discarded and another cylinder prepared and weighed until all 15
cylinders have a weight that is at least 98 percent of that of the heaviest cylinder. The water content of each mixture, from which
cylinders are made, must be within 0.5 percent of the water content that corresponds to the maximum wet density determined inaccordance with ASTM D 1557. Three cylinders from each RCC mixture must be tested at 7, 14, 28, 90, and 180 days forcompressive strength in accordance with ASTM C 39.
The average of the two closest 28-day strength values represent the 28-day compressive strength of the mix. The 28-day compressive
strength of at least one of the mix designs must be 75 percent to 100 percent of the specified strength. The 28-day compressive
strength of at least one of the mix designs must be 100 percent to 125 percent of the specified strength. The 28-day compressive
strength of the remaining mix design must approximate the specified strength.

(210-VI-NEH, Amend. 2, Sept. 2018)

36–5

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

The cementitious materials content that will be used for the job mix will be based on the results of the 28-day compressive strengths ofthe three laboratory mix designs. The 28-day compressive strengths of each of the three laboratory mix designs will be plotted to forma curve showing the relationship of the cementitious materials content to the 28-day compressive strength of the laboratory mix
designs. A cementitious material content must be selected from this curve corresponding to the 28-day compressive strength specified
in section 22. The proposed job mix must be proportioned to contain the selected cementitious materials content and must be
submitted for approval.
After the job mix has been approved, neither the source, character, or grading of the aggregates; nor the source mill, type, brand, or
quantity of the cement; nor the source, type, or quantity of the pozzolan; nor the type, brand, or quantity of the chemical admixtures
used may be changed without approval. Changes to the approved job mix require submittal and approval of a new job mix thatcomplies with the requirements of this specification.

6.

Test section

Prior to RCC production, the contractor must construct a test section as part of the RCC placement operations. RCC production isdefined as the mixing of RCC to be incorporated into the work and the placing and compacting of RCC, to the specified density,
within the specified lines and grades of the structure. Unless otherwise specified in section 22, the test section must be installed at an
approved location proposed by the contractor. If the contractor constructs the test section in a location that will be incorporated into
the RCC structure, it must be located in a noncritical part of the structure, and it must be removed if it fails to meet the requirements ofthis specification. If the contractor constructs the test section in a location that will not be incorporated into the structure, thecontractor must remove and dispose of the test section upon completion of the testing requirements unless otherwise specified.
All RCC that is incorporated into the structure and placed prior to determining the AMD must be compacted to a density that is at least
96 percent of the TAFD. All RCC incorporated into the structure after the AMD is determined must be compacted to specification
requirements.
The test section must be used to demonstrate all techniques, materials, plant and equipment, and personnel to be used for RCC
construction and quality control. Additional techniques, materials, equipment, and personnel must be demonstrated in the test section
as specified in section 22. Information gained will be used to evaluate the practical effectiveness of all techniques, materials, plant andequipment, and personnel to make minor adjustments to the mix and to determine the AMD of the approved job mix. The contractor
must allow for numerous stops and starts to facilitate the testing that is required to determine the AMD.
The test section must be of sufficient size to allow the complete RCC placement and compaction operation to be conducted with theequipment operating at normal operating speeds.
When the test section is placed on soil, a minimum of two 12-inch lifts must be placed, and tests for determining the AMD must be
conducted on the uppermost lift.
A section must be constructed to determine the adequacy of the procedures implemented to construct vertical surfaces. Any surface
that is not horizontal is, within this specification, considered to be a vertical surface. Unless otherwise specified in section 22, thetolerance of vertical surfaces must conform to the requirements of section 18. The finish and appearance of formed and unformed
vertical surfaces must comply with the requirements specified in section 17.
The contractor and engineer must conduct the pre-test section briefing to review the field status related to the preparedness, capability,
and readiness of the contractor to construct the test section according to the approved plan. After test section construction and before
RCC production, the contractor and engineer must conduct the post-test section briefing to discuss adjustments to the techniques,materials, plant, equipment, and personnel that will be used in RCC production. The contractor must submit in writing a final plan for
RCC production methods, materials, plant, equipment, and personnel that will produce RCC that meets the requirements of thisspecification. Unless otherwise specified, the plan must be submitted no later than 7 days prior to beginning RCC production. Written
approval of the plan must be required prior to beginning RCC production.
Apparent maximum density—AMD is the maximum RCC density of the approved job mix that can be attained by compacting the
RCC with the production roller defined in section 13 of this specification. The AMD must be greater than or equal to 98 percent of the
TAFD. The AMD of the RCC must be determined from the test section.

36–6(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

To determine the AMD, the RCC lift must be compacted by successive passes of the production roller over the entire lift surface.
(Note: The act of rolling forward past a point and then rolling in reverse past the same point is considered two passes.) Between passesof the production roller, in-place wet density tests (ASTM C 1040) must be made at a depth of 12 inches. Density tests must be
initiated after the second pass of the production roller. A minimum of two density tests must be performed at a depth of 12 inches andat approved locations. Successive passes of the production roller, followed by density tests at the 12-inch depth, must be made until
the density of the lift no longer increases. When it appears that continued compaction will not increase the density, make two morepasses of the production roller, each followed by a density test to document that the density is no longer increasing. Once it has been
determined that the density measurement at the 12-inch depth is no longer increasing, density tests must be taken in two locations at
depths of 2, 4, 6, 8, 10, and 12 inches. If the maximum and minimum density values obtained in one test hole vary more than 2 percentof the maximum value obtained at that test hole, the contractor must modify operations until this variation is no more than 2 percent.
When the density of the lift no longer increases and the density measurements taken at the specified depths vary no more than 2
percent of the highest value measured at one location, the density must be measured at the 10-inch depth at six approved locations. If
more than one of these density measurements results in values less than 96 percent of the TAFD, the contractor must modify
operations and repeat the process for determining the AMD. The AMD is the average of the in-place density test values that are
greater than or equal to 96 percent of the TAFD of the job mix. If the AMD is less than 98 percent of the TAFD of the job mix, thecontractor must modify operations to attain an AMD that is at least 98 percent of the TAFD.
If a new job mix is approved during production of RCC, a new TAFD will be computed and a new AMD will be determined aspreviously specified.
Air content and density—The air content of the mix must be determined according to ASTM C231 modified to use an impact hammer
and tamping plate for compacting the AERCC in two equal lifts. The compaction of AERCC must be performed as described in
ASTM C1435, taking care not to compact each layer more than necessary for the complete mortar ring formation. The tamping plate
must have a diameter that is equal to the diameter of the inside of the air pot minus 3/8 to 5/8 inches. The volume and tare weight of
the air pot must be determined according to ASTM C138. After consolidating the RCC in the air pot and just prior to testing todetermine the air content, the weight of the RCC and pot must be determined according to ASTM C138. The density of the RCC thatis consolidated in the pot at the time of testing must be computed.
Compressive strength tests—Fifteen compressive strength cylinders must be prepared from the mix in accordance with ASTM C1176
or C1435 and weighed to determine the density of the RCC within each cylinder. Any cylinder that weighs less than 98 percent of theweight of the heaviest cylinder must be discarded and another cylinder prepared and weighed until all 15 cylinders have a weight thatis at least 98 percent of that of the heaviest cylinder. Three cylinders must be tested at 7, 14, 28, 90, and 180 days, respectively, forcompressive strength in accordance with ASTM C39.
Unless otherwise specified in section 22 of this specification, the contractor must extract 10 intact vertical core samples, in accordancewith ASTM C42, from a portion of the test section that has been placed to the specified density and cured in accordance with thisspecification. Core specimens must be taken 13 days after the RCC is placed. The contractor must test two samples at 14, 28, 56, 90,
and 180 days, respectively, for compressive strength in accordance with ASTM C42. Cores must have a minimum length equal to one
lift thickness and a nominal diameter of 6 inches.

7.

Mix plant

The plant must either be a batch-type pugmill or a continuous-flow pugmill. The pugmill must be a twin shaft paddle-type mixer andmust have adequate capacity to produce a uniform RCC mix at a rate that will conform to the production schedule. The plant musthave a minimum capacity of 100 tons per hour.
The plant must have demonstrated satisfactory reliable performance on similar mixes on other RCC projects with little or no downtime because of mixer breakdown or other production-related problems, excluding normal maintenance. Satisfactory reliable
performance of the proposed plant must be documented by mixer uniformity tests from recent production work showing that the plant
produced a mix of similar proportions that met the requirements for production rate and uniformity set forth in this specification.
The results of uniformity tests that are conducted after the plant is set up and calibrated may be substituted for documentation ofreliable past plant performance provided the results of the uniformity testing are in compliance with the requirements of table 36–2.
RCC produced during uniformity tests required herein must not be incorporated into the test section or any permanent structure.
(210-VI-NEH, Amend. 2, Sept. 2018)

36–7

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

The contractor must perform trial runs of the mixing and proportioning equipment, including uniformity tests if required.
Accuracy. Facilities must be provided for the accurate measurement and control of each of the materials entering the RCC mix.
Delivery of materials as they are discharged from the mixer and from any gob hoppers must be within the tolerances shown in table
36–1.

Table 36–1

Tolerances in proportioning the various ingredients

Material

Tolerance

Pozzolan, mass

±2%

Cement, mass

±2%

Aggregate, mass

±3%

Water, mass or volume±2%

Chemical admixture, mass or volume±3%

Component monitoring systems. The systems that meter individual mix components must be interlocked with the plant control andmust warn the operator and shut down the plant if any component is not feeding into the mixing chamber.
Aggregate bins. A separate bin must be provided for each gradation of aggregate supplied for the RCC job mix. The bins andassociated conveyors must be capable of discharging and conveying the aggregates at a uniform rate without clogging, under all
conditions.
Portland cement and pozzolan silos. All onsite storage facilities and connection hoses must be properly labeled with readily visible
signage. The storage silos must be weather tight to prevent moisture and contaminants from accessing the portland cement andpozzolan. Blended cement/pozzolan products mixed by the cement manufacturer are permitted. Silos must be capable of dispensing ata uniform rate without clogging or bridging of the materials.
Portland cement, pozzolan, and aggregate feed. For a continuous-flow pugmill, the portland cement, pozzolan, and aggregates must
be uniformly, continuously, and simultaneously fed into the mixing mechanism at the appropriate ratios. Each bin opening must be
provided with a gate that can be maintained at the necessary opening size to consistently provide the correct feed rate. The bins must
be of sufficient size to ensure a uniform flow of aggregate at a constant rate. Portland cement and pozzolan must be fed continuously
by a feed device that is adjustable to ensure a uniform flow of cement and pozzolan at a constant rate for proportions established by
the approved job mix. Feed devices must be capable of gradual adjustment while in operation.
Water dispenser. A suitable water facility must be provided that is capable of metering and dispensing the mix water within thespecified tolerances. The mechanism for delivering water to the mixers must be free from leakage. The meter must measure the weightof water being added in pounds per unit time for continuous-flow pugmills, and weight per batch for batch-type pugmills. The valve
must be capable of gradual adjustment during the mixing process to compensate for varying moisture contents in the aggregates.
Admixture dispenser. The liquid admixture dispensing system must be capable of metering and dispensing within the specified
tolerances. The dispenser must be designed and installed in such a manner that will permit convenient checking of its accuracy andwill assure uniform distribution of the liquid admixture with water to the materials entering the mixer. The system must be leak-freeand designed and installed to prevent backflow or siphoning.
Mixing mechanism. The mixing mechanism must be capable of combining the materials into a uniform mixture and discharging thismixture without segregation. The mixing mechanism must produce a mix that meets the uniformity requirements listed in table 36–2.

36–8(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Uniformity tests. When a continuous-flow pugmill is used, the three samples for obtaining uniformity tests must be taken from RCC
produced near the beginning, the middle, and the end of a production run lasting a minimum of 1 minute. When a batch-type pugmill isused, the samples must be taken from RCC produced from three separate batches. Each batch must be similar in size, be produced bycharging the mixer in a similar manner, be mixed at the same mixing speed and mix retention time as the other two batches, and be
representative of a normal production run.
Table 36–2

Requirements for uniformity

Test

Allowable max.
difference 1/

ASTM standard

Water content of full mix (% by weight)(Select one of the ASTM standard tests listed)

10%

Coarse aggregate content (% by weight)
Density (lb/ft3) of full mix
Compressive strength at 14 days (lb/in2)

10%
2%
15%

C566
D2216
D3017
D4643
D4959
C685 (annex)
C1170
C39 2/

1/ The allowable maximum difference = 100 multiplied by the (maximum value – minimum value) divided by the average of three tests.
2/ Cylinders must be made in accordance with ASTM Standard C1176 or C1435.

Mix record. The mix plant must be capable of continually producing an RCC mix record. The record must show the weight of
portland cement, pozzolan, water, aggregate, and weight or volume of chemical admixture that is processed through the plant during a
specific time interval. The time interval must not exceed 30 minutes. The aggregate must be reported in terms of saturated surface dryweight processed through the plant during a specific time interval. The RCC mix record must be produced at all times when the plantis producing a mix. The aggregate moisture must be tested daily whenever RCC is being produced. The mix plant record must include
the aggregate moisture content tests upon which the batch proportions are based.
A summary shift record must be provided. The record must include the total quantity of each constituent in the mix, total quantity of
RCC produced, and a comparison of the quantity of each constituent mixed per cubic yard to that of the job mix.
Noise pollution. The plant must be operated to comply with all applicable regulations pertaining to noise pollution.
Pollution control. The plant must be operated to comply with all applicable regulations pertaining to air and water quality.

8.

Mixing

The plant must be operated according to the manufacturer’s recommendations. The mixing mechanism must be maintained insatisfactory operating condition and must be cleaned after each production run. All supply bins and silos must be kept sufficiently fullto ensure a uniform and constant flow of all materials.
All RCC produced from the beginning of startup must be disposed of at the location or locations specified in section 22 of thisspecification until a uniform mix of the required proportions is consistently being discharged from the mixer.
After a batch-type pugmill has been calibrated and has produced the job mix with the specified uniformity, the mix retention timemust not be reduced.
Uniformity—RCC uniformity must be monitored by continuous visual inspection by the plant operator and by periodic visualinspection by contractor quality control personnel. The mix must be visually inspected for uniformity by contractor quality control
personnel at the beginning of each production run and at least once each hour during the production run. If it becomes apparent that(210-VI-NEH, Amend. 2, Sept. 2018)

36–9

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

the mixer is not producing a uniform mix of the proportions specified, RCC production must be promptly discontinued until the
problems that caused the uniformity problem are discovered and corrected.
If a uniformity problem is suspected, the contractor must conduct the tests listed in table 36–2, determine the maximum difference andcompare to the allowable maximum difference, and take appropriate corrective measures.
Adjustments must be made to the mixing plant as necessary to obtain the required uniformity and consistency of the RCC mix when
uniformity test results indicate that the requirements for uniformity are not being met. The production and placement of RCC may
proceed without waiting for the compressive strength results if the results of the other three tests listed in table 36–2 are within theallowable maximum difference and the issues that caused a uniformity problem are resolved.

9.

Conveying

The RCC mix must be conveyed from mixer to placement area as rapidly as practicable by methods that prevent segregation,
contamination, and loss of water. The total length of time from the end of mixing until the RCC has been placed, spread, andcompacted must not exceed 45 minutes.
The contractor must provide baffles to limit free fall of mixed RCC to a maximum of 5 feet at the discharge end of conveyors, within
hoppers, and at other locations where the potential for segregation may occur. Chutes that tend to cause segregation, such as an
inclined chute, will not be permitted.
Communications—Telephone, radio, or other voice communication must be provided between all interim storage hoppers, the batch
plant control, and the placement locations. The contractor must provide the Government inspector the same form of communication.
Temporary storage containers—Gob hoppers must be used for storage wherever the mixed RCC is temporarily accumulated prior tobeing loaded into hauling equipment and when direct conveyor systems do not otherwise provide continuous delivery to the final
placement location. Gob hoppers must be configured to allow free flow of RCC without segregation or choking.
Conveyor belts—The conveyor system design and layout must provide for adequate capacity, speed, reach, and pivot points to convey
RCC to all placement areas.
Conveyor belts must be designed, erected, operated, and maintained in a manner that meets production requirements and does notsegregate materials. RCC must not be exposed on any belt for a period exceeding 5 minutes without being protected from the drying
elements of wind and sun. RCC must not be exposed on any belt during rainfall unless it is protected from the rain.
Hauling equipment—Equipment must be maintained in good operating condition and must not be permitted onto the RCC surface
when vehicle fluids are leaking or when there is a potential for contamination to the RCC.
RCC may be hauled using trucks, front-end loaders, or scrapers. Hauling equipment that ruts, scores, mars, or indents the RCC surface
must not be operated directly on previously compacted RCC surfaces. Hauling equipment must not track mud or other contaminants
onto previously placed RCC and must not be operated directly on uncompacted RCC. All hauling vehicles must be operated in amanner that prevents tight turns, sudden stops, or other actions that cause damage or displacement to previously compacted RCC. The
contractor must implement necessary measures to prevent contamination or damage of the previously compacted RCC.

10.

Weather

Adverse weather—In adverse weather (heavy rain, severe cold, heavy snow, and hot temperature) where the conditions specified
herein for RCC construction cannot be maintained, an interruption in placing operations is required.
Weather station—The contractor must install and maintain a weather station onsite at all times during performance of the test section
and the production and placement of RCC. The weather station must be located at an approved location near the RCC structure. The
weather station must record wind speed, ambient temperature, humidity, and the rate and cumulative volume of rainfall. A record ofclimatic conditions at the designated location including wind speed, ambient temperature, humidity, and rainfall rate and volume must
be recorded daily.
Wet weather placement—RCC must be protected from rainfall-induced erosion and must not be placed during rainfall events at a rateequal to or greater than 0.1 inch in 20 minutes. Placement during a light mist may continue when covered belt conveyors rather thanhauling vehicles are used to convey the mix. Placement of RCC will not be permitted when rainwater accumulates on compacted RCC
surfaces.
36–10(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Cold weather placement—RCC must not be placed when the ambient air temperature drops below 35 degrees Fahrenheit or thetemperature of the RCC mix is less than 40 degrees Fahrenheit.
Hot weather placement—The maximum temperature of the RCC at time of placement must be as specified in section 22. After
placing, but prior to compaction, the temperature of the mix must be determined according to ASTM C 1064. When the RCC
temperature is within 2 degrees of the specified limit, it must be measured every hour. Introduction of chilled water and/or ice, shading
and/or cooling of the aggregates, or other measures may be required in the production of RCC to maintain the RCC temperature within
the specified requirements. If the RCC temperature exceeds the maximum specified temperature, RCC placement must be suspended
until cooler weather or additional measures to reduce the RCC temperature results in a reduction of the placement temperature of the
RCC to or below the specified maximum temperature.

11.

Foundation preparation

Prior to the start of RCC placement, the foundation must be excavated or filled to the specified lines and grades as shown on thedrawings. The foundation must be free of standing water and any organic or loose materials. All surfaces where RCC installation is
specified must be damp and have a surface temperature not less than 35 degrees Fahrenheit at time of placement. Placement of RCC
on mud, dried earth, uncompacted fill, standing water, or frozen subgrade is not permitted.
Earthen foundations—Earthen foundation surfaces must be prepared by adjusting the moisture content and compacting thefoundation. The moisture content, depth, and degree of compaction required must be as specified in section 22. If the earthen
foundation is allowed to dry after compaction, it must be moistened prior to placing RCC. The foundation surface must be firm anddamp.
Rock foundations—Rock foundations must be cleaned and prepared as specified in Construction Specification 63, Treatment of RockSurfaces. The slope of the finished foundation surface must not be steeper than one horizontal to one vertical. Rock surfaces must be
damp at the time of RCC placement.

12.

Placing and spreading

The placement of RCC into the structure must be such that once placement begins, it is performed without interruption until RCC
placement and compaction complies with specification requirements within the geometric limits planned for that placement period.
The contractor must obtain the concurrence of the engineer when establishing the geometric limits of RCC to be placed andcompacted in any placement period.
All equipment used on the RCC fill must be maintained in good operating condition at all times. Equipment must not drip or spill oil
or other contaminants onto the RCC. Any equipment that contaminates the RCC mixture must be promptly removed from contact with
the RCC and repaired or replaced. Any contaminated RCC mixture must be removed and replaced.
Placing and spreading must be performed with equipment that does not mar or contaminate the surface of the compacted RCC. Tracktype equipment must not operate directly on compacted RCC unless the tracks are equipped with rubber pads. Equipment used todeposit, spread, or compact must not turn on previously compacted RCC.
Layout of the placement area—The RCC must be spread in level lifts across the entire area of the structure. The direction of RCC
placement must be parallel to the long axis of the structure so that the number of lanes and the number of edge joints are minimized.
Transverse joints of adjacent lanes must be offset by no less than 20 feet horizontally.
Placing—RCC mix, bonding mortar, portland cement, neat cement grout, or concrete must not be placed on previously placed layersthat have not been compacted to the specified density.
Roller compacted concrete mix must be deposited as near to its final location as possible. When haul vehicle delivery is used,
depositing must be accomplished with a dump-spread action while the placing vehicle is moving. Belt placement must discharge witha spreading action that does not segregate the material. RCC must not be deposited directly against formwork or other verticalsurfaces. Piles that form when placing RCC must not contact forms or vertical surfaces. Neither the discharge height nor the pileheight of RCC must exceed 5 feet.

(210-VI-NEH, Amend. 2, Sept. 2018)

36–11

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Spreading—Spreading of the RCC must be completed within 10 minutes following depositing. RCC must be spread into an
uncompacted, uniform lift thickness that can be compacted to produce a lift of the specified thickness and density. In areas requiring
special compaction, it may be necessary to deposit, spread, and compact the RCC in several layers to produce a lift of the specified
thickness and density.
Equipment must not operate directly on any surface that has been cleaned and prepared to receive a subsequent lift of RCC.
Spreading of RCC material must be performed with a track-type bulldozer in a manner that will not cause damage to previously
compacted RCC.
With RCC placement at or near its final location, spreading will typically be limited to leveling the RCC into uniform lifts. In isolated
or confined placement locations, the RCC may be deposited and spread up to a maximum distance of 50 feet provided segregation
does not occur, specified spreading time is not exceeded and the time specified between mixing and a completion of compaction is notexceeded. The contractor must conduct placing and spreading operations in a manner that will prevent segregation of RCC.
If segregation of RCC occurs during the spreading operation, it must be corrected by immediately reworking the RCC. Reworking
must be performed using techniques that do not damage previously compacted RCC. This may require removing the RCC from the lift
surface to accomplish reworking, then transporting the mix back onto the surface after mix uniformity has been achieved. If reworking
the RCC does not produce a uniform mix, or if the specified time between mixing and compaction is exceeded, the segregated RCC
must be wasted and replaced.
If a uniformity problem is suspected, uniformity tests must be performed from material taken from the placement area following
spreading of the material and/or other points in the RCC production process as required to identify the source of the problem. Three
individual samples of the material must be taken at the sample location at intervals of 5 minutes or more. Uniformity tests must be
conducted in accordance with table 36–2. The maximum difference between the resulting values must be compared to the allowablemaximum difference and appropriate corrective measures be employed.

13.

Compaction

The entire surface area of each RCC lift must be compacted to the specified density, as determined from the apparent maximum
density (AMD) specified in section 6, with adequate compaction overlap to ensure complete compaction of the RCC.
The in-place wet density of the compacted RCC measured at a depth of 10 inches must not be less than 98 percent of the AMD.
Uniformity of density must be achieved within each lift. The difference between density measurements at any two depths must notexceed 2 percent of the greater of the two values.
The wet density of the compacted RCC must be tested in accordance with ASTM C1040. The moisture content of the compacted RCC
must be tested in accordance with ASTM D3017. Unless otherwise specified in section 22, a minimum of three moisture and density
tests will be performed on each lift of RCC with no less than one density measurement and moisture measurement for each 100 cubic
yards of RCC compacted.
Production compaction must be performed with production rollers as defined in this section. RCC compacted with production rollers
must be compacted in single lifts that are 12 inches thick (plus or minus 1 inch) after the specified density has been achieved.
Production rollers must be single or double drum, large, self-propelled vibratory rollers. The rollers transmit a centrifugal force to thesurface through smooth steel drum or drums by means of revolving weights, eccentric shafts, or other equivalent methods. Production
rollers must impart a centrifugal force of at least 450 pounds per inch of drum width at the operating frequency during compaction.
Production rollers must operate at a vibrating frequency of at least 1,500 vibrations per minute and have a drum diameter of 4 to 6 feet
and a drum width of 5 to 8 feet. The amplitude of vibration of the roller must be between 0.03 and 0.07 inch. The roller must not travelat greater than 2 feet per second during the compaction operation.
Production rollers must be used in open areas where they can compact RCC to the specified density within the specified time andwithout damage to the structure, forms, foundation, or appurtenances.

36–12(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Rollers may only be operated in the vibratory mode while actively compacting the RCC. After the RCC has been deposited andspread, rollers may be operated in static mode to smooth and/or firm up the surface, but must operate in the vibratory mode to compact
the RCC to the specified density. Compaction must be completed with the roller operated in the static mode, as necessary, to achieve
the specified density near the surface of the lift.
The contractor must select the combination of frequency of vibration, amplitude of vibration, and speed of operation that result in thespecified density at the fastest production rate while meeting all other requirements.
Placement and compaction of RCC must be completed without damaging the structure, other structures, forms, foundation, or otherembedded appurtenances. Any appurtenance damaged by the compaction process must be repaired or removed and replaced at thecontractor’s expense.
Special compaction techniques must be performed using special compaction rollers and power tampers in areas where production
rollers cannot maneuver or will cause damage to the structure, forms, foundation, or appurtenances. RCC must be deposited, spread,and compacted in 4- or 6-inch-thick layers as required to obtain uniform specified density throughout the 12-inch lift with limited
compaction to avoid drying the surface.
The individual layers that compose one lift must be deposited, spread, and compacted within 1 hour from the time the first layer withinthat lift is placed.
Special compaction rollers must be vibratory rollers that are capable of operating in confined areas and adjacent to forms, foundation,
or appurtenances without damage to the RCC structure or appurtenances. Special compaction rollers must produce a centrifugal force
of at least 150 pounds per linear inch of drum width for each drum of a double drum unit and 300 pounds per linear inch of drum
width for a single drum unit. Special compaction rollers must be operated at a speed less than 2 feet per second during the compaction
operation.
Power tampers must develop a force per blow of at least 3,500 pounds per square foot. The maximum layer thickness to be compacted
by power tampers must be plus or minus 6 inches after the specified density has been achieved.
The contractor must maintain at least one special compaction roller and two tampers in operating condition at the site during RCC
placement.
Manually directed vibratory plate compactors may be used to shape, smooth, and level the surface, but must not be used as a substitutefor vibratory rollers and power tampers.

14.

Record testing

Unless otherwise specified in section 22, one set of RCC cylinders for compressive strength tests must be obtained for each 1,000
cubic yards of RCC placed to be used for compressive strength testing.
Each set must consist of 15 compressive strength cylinders prepared in accordance with ASTM C 1176 or C 1435 and weighed todetermine the density of the RCC within each cylinder. Any cylinder that weighs less than 98 percent of the weight of the heaviest
cylinder must be discarded and another cylinder prepared and weighed until all 15 cylinders have a weight that is at least 98 percent ofthat of the heaviest cylinder. Three cylinders must be tested for compressive strength in accordance with ASTM C 39 at 7, 14, 28, 90,
and 180 days, respectively, after the specimens are molded.
Unless otherwise specified in section 22 of this specification, the contractor must extract two sets of vertical core RCC samples inaccordance with ASTM C 42. Each set must be sampled from RCC that has been placed in the structure at no less than 1 week apart.
Each set must contain eight intact cores taken from the structure at approved locations. Cores must have a minimum length equal to
one lift thickness and a nominal diameter of 6 inches. Core specimens must be obtained no earlier than 20 days after placement. The
contractor must test two samples at 28, 56, 90, and 180 days, respectively, after placement for compressive strength in accordancewith ASTM C 42.

15.

Lift joints

The term joint, as used in this specification, applies to all surfaces that will eventually be covered by RCC mix, bonding mortar,
portland cement, neat cement grout, or conventional concrete.
(210-VI-NEH, Amend. 2, Sept. 2018)

36–13

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

The joint treatment method must be as specified in section 22.
Joint condition—Three potential joint conditions will exist during construction: fresh joint, intermediate joint, and cold joint. The
condition of a joint is defined on the basis of joint maturity or time of exposure. Joint maturity is defined as the product of the average
RCC surface temperature (AST) in degrees Fahrenheit and the time of exposure (TE) in hours. Joint maturity is expressed in degreehours (deg F-hr) and is calculated as———————>
Joint maturity in deg F-hr = (AST)  (TE).
The TE is the period, expressed to the nearest quarter hour, beginning when the compaction of RCC is completed and ending when
covered by the subsequent placement of RCC, bonding mortar, portland cement, neat cement grout, or conventional concrete.
Whenever the joint condition is defined on the basis of joint maturity, the AST must be determined hourly during the exposure period
by measuring the RCC surface temperature at various locations with a surface thermometer. The temperature must be measured indegrees Fahrenheit and the temperature readings averaged to determine the AST.
A fresh joint is defined as a joint having maturity of 400 deg F-hr or less. In lieu of determining the joint maturity, a fresh joint may
be defined as a joint with a TE of 4 hours or less.
An intermediate joint is defined as a joint having a maturity greater than 400 deg F-hr, but less than or equal to 1,600 deg F-hr. In
lieu of determining the joint maturity, an intermediate joint may be defined as a joint with a TE of more than 4 hours, but less than 16hours.
A cold joint is defined as a joint having a maturity of over 1,600 deg F-hr. In lieu of determining the joint maturity, a cold joint may
be defined as a joint with a TE of 16 hours or more.
Joint treatment—All joint surfaces must be kept continuously moist, clean, and uncontaminated until placement of succeeding RCC
lifts. Water that ponds on a finished surface must be removed prior to placing RCC.
The surface of previously placed RCC must be free of soil, dust, or other contaminants prior to being covered with joint treatment
material or another layer or lift of RCC. Cleaning of previously placed RCC lifts must be accomplished by pressurized water and/or
air or other methods provided that the surface of the in-place layer is not damaged by the cleaning operation.
The contractor must have a pressure washer and a blowpipe onsite capable of delivering a combined air-water mixture, with the ability
to adjust the pressure, volume, and proportion of air and water.
Edge joints that are exposed for more than 30 minutes must be trimmed back no less than 9 inches to an RCC surface, that has been
compacted to the specified density and beveled at a slope of one horizontal to one vertical. Immediately before placing RCC against atrimmed surface, the joint condition must be determined and the specified joint treatment must be applied.
Any surface to be covered with RCC, a bonding material or conventional concrete that is damaged to the extent that over 25 percent of
the exposed coarse aggregate is undercut must be treated as a cold joint. Coarse aggregate with less than half of it surface area
remaining embedded and bonded to the RCC is considered undercut.
All RCC materials removed by cleaning, brooming, smoothing, beveling, or trimming layers must be collected and removed from thestructure.
Treatment Method I. Remove any loose materials and contaminants from the lift joint surface. The lift joint surface must be cleaned
using moderate-pressure air immediately before spreading the next RCC lift. Maintain the surface in a moistened condition.
Treatment Method II. Perform Treatment Method I. Before the placement of RCC on the joint surface, uniformly distribute a layerof dry portland cement over the surface. The portland cement must be applied at a rate of 0.5 to 1 pound per square foot of surface.
The amount of water applied to the lift surface before, during, or after distributing the cement must be of sufficient quantity to dampen
all of the cement. The ratio of water to cement must be limited to that which will produce a tacky paste. Water applied after the
cement is distributed must be applied in a fine mist to prevent the displacement of cement. The cement must be applied immediately
ahead of placing the next layer or lift of RCC. The cement must not be exposed on the surface more than 10 minutes before being
36–14(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

covered with RCC. Portland cement paste that does not meet these requirements must be removed from the structure and disposed of,and the treatment method must be repeated.
Treatment Method III. Perform Treatment Method I. Before the placement of RCC, the joint surface must be covered with a layer ofthe bonding mortar specified in section 2. The thickness of the bonding mortar must be 0.25 to 0.5 inch. The bonding mortar must becovered with the next layer or lift of RCC while the mortar is still fluid. In no case may the bonding mortar remain uncovered for morethan 30 minutes. Bonding mortar must be placed in a manner that will avoid segregation. Bonding mortar that does not meet theserequirements must be removed from the structure and disposed of, and the treatment method must be repeated.

16.

Curing and protection

Curing—Curing of RCC must begin immediately after compaction. All exposed and completed RCC surfaces must be cured for aminimum of 14 days at or above 40 degrees Fahrenheit following placement. All repairs, including those required to fill holes
associated with form anchorages and coring, must be cured for a minimum of 7 days at or above 40 degrees Fahrenheit following
repair.
If the RCC is wet cured, the RCC must be maintained in a continuously damp condition for the entire curing period. The continuous
application of water supplemented by the use of a saturated cover material or an impermeable covering must be required to obtain thecontinuously damp condition. The application of water or cover material must not erode, mar, or otherwise damage the RCC. Plastic
or paper covering must meet the requirements of ASTM C 171. Only white or reflective coverings may be used during hot weather as
defined by ACI 305.
In lieu of wet curing, RCC that will not be covered with subsequent joint treatment, RCC, or conventional concrete may be treatedwith a curing compound as specified in section 2, unless otherwise specified in section 22. Areas to be cured with curing compound
must be kept continuously moist until curing compound is applied. Curing compound must be thoroughly mixed before applying andmust be agitated during application. A continuously agitating pressure sprayer must be used to apply the curing compound at a
uniform rate of not less than double the curing compound manufacturer’s recommended rate for conventional concrete curing. Manual
hand pump sprayers may not be used. A brush or paint roller must be used in areas that are near unmasked surfaces that will becovered with subsequent joint treatment, RCC, or conventional concrete. The curing compound must form a uniform, continuous,adherent film that will not check, crack, or peel and be free from pinholes or other imperfections. Multiple applications of curingcompound may be necessary to achieve the specified coverage. When multiple applications are required, the second application must
be applied at a 90 degree angle to the first application. During the curing period, curing compound must be reapplied 7 days after the
initial application. In areas where the curing compound is damaged, it must be reapplied immediately.
Curing compound must not be applied to areas that are to be repaired or patched. Areas to be repaired or patched must be kept
continuously moist until the repair is made. Curing compound or wet curing must then be implemented to conform to curing
requirements specified herein. Any curing compound applied to areas that are to be repaired or patched must be removed prior toapplying the repair material.
Regardless of the curing method used, curing activities must not be discontinued or interrupted until the RCC has remained at or
above 40 degrees Fahrenheit for a total of 14 days. This will require extending the curing period by the number of days that the RCC
temperature drops below 40 degrees Fahrenheit during the curing period.
Protection—The temperature of RCC must be maintained at or above 35 degrees Fahrenheit from the time the RCC is placed until 7
days after the curing period. When ambient temperatures are expected to be below 32 degrees Fahrenheit, measures must be
implemented to protect the RCC from freezing. The protection must remain in place until ambient temperatures remain continuously
above 35 degrees Fahrenheit for 24 hours. Protective measures must not hinder the specified curing of the RCC.
RCC must be protected from damage by precipitation, vehicular traffic, or other causes.

17.

Vertical surfaces

Unless otherwise specified in section 22, all formed RCC vertical surfaces that are subject to exposure must be finished to ensure aminimum of 80 percent of the surface area is free from honeycomb or other voids and is uniform in appearance. Forms must remainin place for a minimum 12 hours after the RCC is installed and until they can be removed without damage to the RCC.
Forming is not required for vertical RCC surfaces that are not subject to permanent exposure.
(210-VI-NEH, Amend. 2, Sept. 2018)

36–15

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

The finish and appearance of unformed vertical surfaces must comply with the requirements specified in section 22.

18.

Tolerances

Any variation in the face or surface of the finished RCC must be within the tolerances stated herein.
The structures must be constructed to the lines and grades depicted on the drawings.
The thickness of compacted lifts of RCC must be 12 inches plus or minus 1 inch.
The allowable tolerance of all exposed formed surfaces must be plus or minus 0.1 foot from specified line. Abrupt changes must notexceed 0.05 foot in any exposed formed surface.
Limit gradual overbuild of exposed unformed RCC faces to 0.5 foot. Under build will not be allowed.
Do not exceed 0.1 foot in 10 feet variation in an unformed, exposed RCC face as measured in a straight line along the length andheight of the face, or 0.5 foot over the entire length of the structure. Abrupt changes must be less than 0.1 foot.
The elevation of any horizontal RCC surface must be plus or minus 0.1 foot of the specified grade except that the elevation of afinished top of dam or spillway crest must be no more than 0.1 foot above the specified elevation.

19.

Repair of RCC

Repair or replacement—The contractor must repair or replace RCC that does not meet the requirements of this specification. Before
starting any repair or replacement work, the contractor must prepare a written plan for the repair or replacement. The primaryreference for material and repair methods for the plan must be the appropriate sections of the American Concrete Institute’s Manual ofConcrete Inspection. The repair plan must be submitted for review and approval at least 10 days before any repair or replacement
work.
Patching—All form bolts, metal ties, and similar forming restraints must be removed to a depth of 1 inch below the surface of the
RCC and their cavities repaired unless otherwise specifically permitted or specified in section 22. Small cavities, large air holes, minor
honeycombed areas, holes created from test coring, and other superficial imperfections that require patching to meet the specified
finish requirement must be thoroughly cleaned and filled. Holes left by bolts or straps that passes through the RCC must be filled solidwith a dense, well-bonded nonshrink patching material. Dry-pack mortar and replacement concrete must follow the appropriate
procedure detailed in the Repair and Maintenance chapter of the Concrete Manual, Bureau of Reclamation, U.S. Department of theInterior. Proprietary patching material must be appropriate for the type of repair used within the manufacturer's recommended limits
and applied according to the manufacturer's recommendations.
When proprietary patching material is proposed in the plan, the manufacturer's data sheets and written recommendations must be
included in the plan.
Repair material or replacement concrete must have properties, color, and texture similar to and compatible with the concrete being
repaired or replaced.
Curing of repaired or replaced concrete must be started immediately after finish work is completed as specified in section 16 or as
specified by the manufacturer of proprietary compounds.

20.

Cleanup of spillage

21.

Measurement and payment

All loose gravel and uncompacted RCC material must be removed from the structure for disposal in approved locations or as specified
in section 22 and must not be recycled into the RCC mix.
For items of work for which specific unit prices are established in the contract, the volume of RCC is measured and computed to thenearest cubic yard by the method of average cross-sectional end areas. Unless otherwise specified in section 22, no deduction involume is made for embedded items, such as (but not limited to) conduits, inlet structures, outlet structures, embankment drains, sanddiaphragm and outlet, and their appurtenances.
The volume of RCC must be determined by measuring from the surface of the foundation when approved for RCC placement to thespecified neatlines of the completed RCC structures, unless otherwise specified in section 22.
36–16(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

If the test section is not incorporated into the RCC structure, the volume of RCC placed into the construction of the test section will be
added to the volume computation of the completed RCC structure to determine the total volume of RCC for payment. If the test
section is incorporated into the RCC structure, no addition volume of RCC must be included for payment.
When the test section is paid for under a separate bid item, the test section will not be measured for payment. Payment will be made at
the contract lump sum price for the test section and will constitute full compensation for the completion of the test section including
any removal and disposal as applicable.
Payment for the RCC, for which a specific unit price is established in the contract, will be computed to the nearest cubic yard.
Payment constitutes full compensation for furnishing all labor, materials (except cementitious materials), equipment, tools
transportation, and all other items necessary and incidental to the construction and removal of the test section and construction of the
RCC structure, including joint treatment, trimming and removal, repair, replacement, patching, curing, protection, site cleanup, anddisposal of spillage and waste materials. Payment for treatment of rock foundation surfaces, if any, will not be included in the payment
for RCC. Payment will not be made for RCC material that is wasted or rejected for failure to comply with this specification.
Payment for each cementitious component of the RCC, for which a separate bid item is included in the contract, includes the quantity
incorporated into the RCC structure and test section. This quantity is computed based on statement of delivery tickets. Payment will
not be made for any cementitious materials not incorporated into the structure or test section.
Payment for the cementitious materials for which specific unit prices are established in the contract will be to the nearest 0.1 ton of
cementitious materials.
Compensation for any item of work described in the contract but not listed in the bid schedule will be included in the payment for theitem of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 22.

22.

Items of work and construction details(210-VI-NEH, Amend. 2, Sept. 2018)36–17

22. Items of Work and Construction Details
In Section 5, RCC mix design, the minimum compressive strength shall be 3000 psi at 28 days.
In Section 6, Test section, the location of the test sections shall be the floor of the stilling basin asshown in the drawings. The first test section shall sample the first and second lifts, and thesecond test section shall sample the second and third lifts.
In Section 10, Weather, Hot weather placement, the maximum temperature of the RCC at time ofplacement shall be 85ºF.
In Section 11, Foundation preparation, the final compacted and graded subgrade surface of thefoundation area shall be examined by a qualified representative of the Engineer and approved by
the Engineer prior to placement of any RCC. All earthen surfaces on which RCC is placed shallbe within the moisture content range specified on the drawings and at a surface temperature inexcess of 35ºF.
In Section 15, Lift joints, Treatment Method I shall be used for fresh joints, intermediate joints
and cold joints throughout the entire structure.
In Section 17, Vertical surfaces, the Contractor shall provide a written plan for constructing thespecified vertical surfaces to the Engineer for approval at least 60 days prior to the start ofconstruction of vertical RCC surfaces.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 25, Roller Compacted Concrete (RCC)(1)

This item shall consist of furnishing and placing all roller compacted concrete(RCC) required for the construction of the RCC auxiliary spillway as shown on thedrawings.

(2)

The Contractor shall provide a drawing showing the layout of the mixing plant for
the RCC. The layout shall be located on-site within the work limits designated on
the drawings. The drawing shall designate a temporary disposal area(s) forsegregated or contaminated aggregates; non-uniform, initial batch mixes; and/or
rejected RCC materials as required in Section 2, Section 8, and Section 20. Prior toconstruction completion, the materials in these temporary area(s) shall be removed
and disposed of legally at an authorized off site disposal facility. All state and local
laws pertaining to mixing or batching plants shall be adhered to.

(3)

The RCC auxiliary spillway shall be constructed in 12-inch-thick lifts (after
compaction).

(4)

The Contractor shall remove and replace damaged or defective RCC. The Engineer
will determine the required extent of removal, replacement or repair and advise theContractor, in writing, of this determination. Approval of the Contractor’s repair
shall not be considered a waiver of Engineer’s right to require complete removal of
defective work if the completed work does not produce RCC of the required quality
and appearance.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

36-18

(5)

Cranes and heavy equipment shall not be allowed on the RCC after placement
unless approved by the Engineer.

b. Bid Item 26, Cementitious Material(1)This item shall consist of furnishing and handling the cement and pozzolan
required for the production of RCC required for the auxiliary spillway.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

36-19

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

36-20

Construction Specification 41—Reinforced Concrete Pressure Pipe
Conduits
1. Scope
The work shall consist of furnishing and installing reinforced concrete pressure pipe conduits, fittings, and accessories as shown on the drawings and/or specified herein.
2. Material
Reinforced concrete pressure pipe, fittings, and accessories shall conform to the requirements of Material
Specification 541, Reinforced Concrete Pressure Pipe.
Portland cement concrete for bedding and cradles shall conform to the requirements of Construction Specification 31 for the specified class of concrete.
Joint sealing compound shall conform to the requirements of Material Specification 536, Sealing Compound for
Joints in Concrete and Concrete Pipe.
Preformed expansion joint filler shall conform to the requirements of Material Specification 535, Preformed
Expansion Joint Filler.
Filter fabric shall conform to Material Specification 592, Geotextile.

3. Laying the pipe
The pipe shall be set to the specified line and grade and temporarily supported on precast concrete blocks orwedges. Concrete blocks and wedges used to temporarily support the pipe during placement of concrete bedding
or cradle, or both, shall be a class of concrete equal to or stronger than the concrete used to construct the bedding
or cradle. Bell and spigot pipe shall be laid with the bells or grooves facing upstream unless otherwise specified
in section 7 or shown on the drawings. Pipe may be installed by initially placing the upstream section of pipe andprogressing with placement of the remaining sections of pipe in the downstream direction; however, care must be
taken to avoid contaminating the joint with soil or bedding as the bell end is slid over the spigot of the adjoining
pipe.
Just before each joint is connected, the connecting surface of the bell and spigot or spigots and sleeve shall bethoroughly cleaned and dried. Also, the rubber gasket and the inside surface of the bell or sleeve shall be lubricatedwith a light film of soft vegetable soap compound (flax soap). The rubber gasket shall be stretched uniformly as itis placed in the spigot groove to ensure a uniform volume of rubber around the circumference of the pipe.
Method 1—The joint shall be connected by sliding the bell over the spigot or by sliding the spigot into the bell andapplying a pulling or jacking force in a manner that will allow the spigot to enter squarely into the bell.
Method 2—The joint shall be connected in accordance with the manufacturer's instructions.
Use with either method—When the spigot has been seated to within 0.5 inch of its final position, the positionof the gasket in the joint shall be checked around the entire circumference of the pipe by means of a metal feeler
gauge. In any case where the gasket is found to be displaced, the joint shall be disengaged and properly reconnected. After the position of the gasket has been checked, the spigot shall be completely pulled into the bell andthe section of pipe shall be adjusted to line and grade.

4. Filling joints
Before the placement of the bedding or cradle, the exterior annular space between the ends of the pipe sections
shall be cleaned and completely filled with joint sealing compound. Before the compound is applied, the surface
against which it is to be placed shall be cleaned of all dust, lubricant, and other substances that would interferewith a bond between the compound and the pipe. If recommended by the manufacturer of the compound, the con(210–VI–NEH, January 2014)41–1

crete surface shall be coated with a primer in accordance with the manufacturer's recommendations. Primers shallbe applied to the concrete surface only and shall not come in contact with the gasket or gasket sealing surface. Unless the compound or primer is specifically recommended for use on moist concrete, the surface shall be dry when
the compound or primer is applied.
The joint sealing compound shall be allowed to cure until it is sufficiently firm to prevent the entry of concrete or
earth into the joint. Unless otherwise specified in section 7 of this specification, before placing bedding or earth
backfill (excluding concrete) containing particles larger than 0.25 inch in maximum dimension within 6 inchesof the joint sealing compound, the compound shall be covered with a strip of 16-gauge to 24-gauge metal at least
2-inches wider than the space between the ends of the pipe sections. Instead of metal strips, the joints shall becovered by a minimum of 2-foot-wide, 4-ply thick filter fabric. Filter fabric shall be wrapped completely around thejoint and overlapped a minimum of 12 inches at the top of the pipe. Lap shall be securely fastened to ensure filter
fabric fits snugly during backfill operations. Filter fabric is centered on the joint. It shall conform to Material Specification 592, table 2, Nonwoven, class II.

5. Pressure testing
Method 1—Pressure testing of the completed conduit is not required.
Method 2—Before placing any concrete or earthfill around the conduit or filling the pipe joints, the conduit shallbe tested for leaks in the following manner:
The ends of the conduits shall be plugged and a standpipe with a minimum diameter of 2 inches shall be attachedto the upstream plug. The conduit shall be braced at each end to prevent slippage. The conduit and the standpipe
shall be filled with water. The water level in the standpipe shall be maintained at least 10 feet above the invert of
the upstream end of the conduit for at least 2 hours. Any leaks shall be repaired, and the conduit shall be tested
again as described. The procedure shall be repeated until the conduit is watertight.
The pipe joints shall show no leakage. Damp spots developing on the surface of the pipe are not considered asleakage.
Method 3—Before placing any concrete or earthfill around the conduit or filling the pipe joints, the conduit shallbe air tested in accordance with ASTM C924. The conduit shall be braced on each end to prevent slippage. All end
plugs used for the air test shall be capable of resisting the internal pressure and must be securely braced.
All testing equipment to be used shall be furnished by the contractor and shall be inspected and approved by theengineer. The pressure gauges used shall be graduated to read in increments of 0.1 pounds per square inch and calibrated to provide accuracy within 10 percent plus or minus of the standard gauge. The contractor has the option of
prewetting the conduit or line before testing. Any conduit that fails to pass this test must be repaired by a method
satisfactory to the engineer. After the repairs are made, the conduit shall be retested until it passes the test requirements.
Method 4—Before placing concrete or earth backfill around the conduit joint to be tested or filling the pipe joints,
the joint shall be tested in accordance to ASTM C 1103, Standard Practice for Joint Acceptance Testing of Installed
Precast Concrete Sewer Line. The test pressure shall be as specified in section 7 of this specification. Any joints
showing leaks shall be relaid or repaired, and the joint shall be retested. The procedure shall be repeated until the
joint passes the test.

6. Measurement and payment
Method 1—For items of work for which specific unit prices are established in the contract, the quantity of eachsize, type, and class of pipe is determined to the nearest 0.l foot by measurement of the laid length of pipe along theinvert centerline of the conduit. Payment for each size, type, and class of reinforced concrete pressure pipe is madeat the contract unit price for that size, type, and class of pipe. Such payment constitutes full compensation for furnishing, transporting, and installing the pipe complete in place. This includes accessories, such as wall fittings, joint
gaskets, coupling bands, sleeves, or collars, and all other items necessary and incidental to the completion of thework except the special fittings and appurtenances listed separately in the bid schedule. Payment for each special
fitting and appurtenance is made at the contract price for that type and size of fitting or appurtenance.
41–2(210–VI–NEH, January 2014)

Method 2—For items of work for which specific unit prices are established in the contract, the quantity of eachsize, type, and class of pipe is determined as the sum of the nominal laying lengths of the pipe sections used. Payment for each size, type, and class of reinforced concrete pressure pipe is made at the contract unit price for thatsize, type, and class of pipe. Such payment constitutes full compensation for furnishing, transporting, and installing
the pipe complete in place. This includes accessories, such as wall fittings, joint gaskets, coupling bands, sleeves orcollars, and all other items necessary and incidental to the completion of the work except the special fittings andappurtenances listed separately in the bid schedule. Payment for each special fitting and appurtenance is made at
the contract price for that type and size of fitting and appurtenance.
All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed in the bid schedule, is included in the payment for the item ofwork to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in
section 7 of this specification.

7.

Items of work and construction details(210–VI–NEH, January 2014)41–3

7. Items of Work and Construction Details
In Section 3, Laying the pipe, Method 1 shall apply.
In Section 5, Pressure testing, Method 1 shall apply.
In Section 6, Measurement and payment, Method 2 shall apply.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 27, Concrete Pressure Pipe, C301, 42-Inch ID(1)

This item shall consist of furnishing and installing the 42-inch I.D. conduit for the
new principal spillway as shown on the drawings.

(2)

The drawings are presented for conduit assembly consisting of basic pipe sections,
10 feet in length. Pipe sections of other lengths shall not be used unless approvedby the Engineer. Where the length of the pipe section furnished differs from thebasic 10 feet length, the resulting total length of the principal spillway conduit shallnot be less than that specified on the drawings.

(3)

Each section of pipe shall be supported at minimum of two locations along its
length. The supports should be located no further than 2 feet from each end of asection. Methods of support which allow the weight of the pipe to bear on the pipe
joint will not be permitted. Supports shall be support blocks or opposing wedges asapproved by the Engineer.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

41-4

Construction Specification 45—Plastic Pipe
1. Scope
The work consists of furnishing and installing plastic pipe (except corrugated polyethylene pipe) and the necessary
fittings and appurtenances as shown on the drawings or as specified herein.
2. Material
Pipe, fittings, and gaskets shall conform to the requirements of Material Specification 547, Plastic Pipe, and as
specified in section 14 of this specification or as shown on the drawings.
Perforated pipe shall conform to the requirements of Material Specification 547, Plastic Pipe, and as specified in
section 14 of this specification or as shown on the drawings.
Unless otherwise specified, concrete shall conform to the requirements of Construction Specification 32, Structure
Concrete, and section 8 of this specification.
Unless otherwise specified, earth backfill shall conform to the requirements of Construction Specification 23,
Earthfill.
Unless otherwise specified, drainfill shall conform to the requirements of Construction Specification 24, Drainfill.

3. Handling and storage
Pipe shall be delivered to the job site and handled by means that provide adequate support to the pipe and do not
subject it to undue stresses or damage. When handling and placing plastic pipe, care shall be taken to prevent impact blows, abrasion damage, and gouging or cutting (by metal edges and/or surface or rocks). The manufacturer's
special handling requirements shall be strictly observed. Special care shall be taken to avoid impact when the pipe
must be handled at a temperature of 40 degrees Fahrenheit or less.
Pipe shall be stored on a relatively flat surface so that the barrels are evenly supported. Unless the pipe is specifically manufactured to withstand exposure to ultraviolet radiation, it shall be covered with an opaque material
when stored outdoors for 15 days or longer.

4. Excavation
Excavation shall be in accordance with Construction Specification 21, Excavation, and section 14 of this specification or as shown on the drawings.
The pipe foundation shall be excavated a minimum of 4 inches lower than the pipe grade shown on the drawings or
staked in the field whenever bedrock, boulders, cobbles, or other material that may cause pipe damage is encountered at planned pipe grade.

5. Laying the pipe
Plastic pipe conduits complete with fittings and other related appurtenances shall be installed to the lines andgrades shown on the drawings or specified in section 14 of this specification. The pipe shall be installed so that
there is no reversal of grade between joints unless otherwise shown on the drawings. The pipe shall not be dropped
or dumped on the bedding or into the pipe trench. The ground surface near the pipe trench shall be free of loose
rocks and stones greater than 1 inch in diameter. This ensures that rock will not be displaced and impact the pipe.

(210-VI-NEH, January 2009)45–1

Just before placement, each pipe section shall be inspected to ensure that all foreign material is removed from inside the pipe. The pipe ends and the couplings shall be free of foreign material when assembled. At the completionof a work shift, all open ends of the pipeline shall be temporarily closed off using a suitable cover or plug.
Care shall be taken to prevent distortion and damage during hot or cold weather. During unusually hot weather(daytime high temperature of more than 90 °F), the pipe assembled in the trench shall be lightly backfilled orshaded to keep it as near to ground temperature as possible until final backfill is placed. Backfill operations shouldbe performed during daily construction periods when the ground temperature and the temperature of the pipe do
not vary more than 40 degrees Fahrenheit.
Perforated pipe shall be installed with the perforations down and oriented symmetrically about the vertical centerline. Perforations shall be clear of any obstructions on the inside and outside of the pipe when the pipe is approvedby the engineer for backfill.
During installation, the pipe shall be firmly and uniformly bedded throughout its entire length, to the depth and in
the manner specified in section 14 of this specification or as shown on the drawings. Bell-holes shall be placed in
bedding material under bells, couplings, and other fittings to assure the pipe is uniformly supported throughout its
entire length. Blocking or mounding beneath the pipe to bring the pipe to final grade is not permitted.

6. Pipe embedment
Earth bedding—The pipe shall be firmly and uniformly placed on compacted earthfill bedding or an inplace earthmaterial bedding of ample bearing strength to support the pipe without noticeable settlement. The earth materialon which the pipe is placed shall be of uniform density to prevent differential settlement.
Unless otherwise specified, a groove that closely conforms to the outside surface of the pipe shall be formed in thebedding. The depth of the groove shall be equal to or greater than 0.3 of the pipe diameter.
Earth bedding shall be compacted to a density not less than adjacent undisturbed inplace earth material or be compacted earth backfill. Earthfill material used for compacted earth bedding shall be free of rocks or stones greaterthan 1 inch in diameter and earth clods greater than 2 inches in diameter. The pipe shall be loaded sufficiently during the compaction of bedding under the haunches and around the sides of the pipe to prevent displacement fromits final approved placement.
Sand, gravel, or crushed rock bedding—When sand, gravel, or crushed rock bedding is specified, the pipe shallbe firmly and uniformly placed on the bedding material. Material for bedding shall not exceed 1 inch in diameter.
Unless otherwise specified in section 14 of this specification or shown on the drawings, the coarse-grained bedding
material shall be carefully placed and compacted to a depth equal to or greater than 0.3 of the diameter of the pipe
above the bottom of the pipe. The pipe shall be loaded sufficiently during backfilling and compaction around thesides to prevent displacement of the pipe from its final approved placement.
Pipe encased in drainfill—The pipe shall be firmly and uniformly placed on bedding of specified drainfill. Drainfill shall be placed and compacted as specified in section 14 of this specification or as shown on the drawings toform a continuous uniform support around the entire circumference of the pipe. The pipe shall be loaded sufficiently during backfilling around the sides and during compaction to prevent displacement of the pipe.

45–2(210-VI-NEH, January 2009)

7. Backfill
Initial backfill—Unless otherwise specified, initial backfill to 6 inches above the top of the conduit is required.
Earth haunching and initial backfill material shall consist of soil material that is free of rocks, stones, or hard clods
more than 1 inch in diameter. Coarse backfill material shall be the specified sand, gravel, crushed rock, or drainfill
material.
Initial backfill shall be placed in two stages. In the first stage (haunching), backfill is placed to the pipe spring line
(center of pipe). In the second stage, it is placed to 6 inches above the top of the pipe.
The first stage material shall be worked carefully under the haunches of the pipe to provide continuous support
throughout the entire pipe length. The haunching backfill material shall be placed in layers that have a maximum
thickness of about 6 inches and are compacted as specified in section 14 of this specification or as shown on thedrawings. During compaction operations, care shall be taken to ensure that the tamping or vibratory equipment
does not come in contact with the pipe and the pipe is not deformed or displaced.
When pressure testing is not specified, the pipe shall be covered with a minimum of 6 inches of backfill material assoon as possible following assembling of the pipe in the trench, but not later than within the same day that placement has occurred. When pressure testing is specified, sufficient backfill material shall be placed over the pipe toanchor the conduit against movement during pressure testing activities.
Final backfill—Final backfill shall consist of placing the remaining material required to complete the backfill fromthe top of the initial backfill to the ground surface, including mounding at the top of the trench. Final backfill material within 2 feet of the top of the pipe shall be free of debris or rocks larger than 3 inches nominal diameter. Coarse
backfill material shall be the specified sand, gravel, crushed rock, or drainfill. Final backfill shall be placed in approximately uniform, compacted layers. Final backfill compaction requirements shall be as specified in section 14of this specification or as shown on the drawings.
Vehicles or construction equipment shall not be allowed to cross the pipe until the minimum earth cover and required density as specified in section 14 of this specification has been obtained.

8. Pipe encasement in concrete
Concrete encasement shall be carefully placed to form a continuous uniform support around the entire circumference of the pipe as specified in section 14 of this specification or as shown on the drawings. Pipes encased inconcrete shall be securely anchored to prevent movement of the pipe during concrete placement. A clear distanceof 1.5 inch shall be maintained between the pipe and the reinforcing steel.
The concrete for the encasement shall conform to the requirements of Construction Specification 32, Structure
Concrete, for Class 3000M concrete unless otherwise specified.

9. Joints
Unless otherwise specified in section 14 of this specification or shown on the drawings, joints shall be either belland spigot type with elastomeric gaskets, coupling type, solvent cement bell and spigot, or jointed by butt heat fusion. When a lubricant is required to facilitate joint assembly, it shall be a type having no deleterious affect on thegasket or pipe material.
Pipe joints shall be watertight at the pressures specified except where unsealed joints are indicated.
Pipe shall be installed and joined in accordance with the manufacturer's recommendations. Laying deflections andjoint fitting or stab depths shall be within the manufacturer's recommended tolerances.

(210–VI–NEH, January 2009)45–3

When solvent cement joints are specified for PVC or ABS pipe and fittings, they shall be made in accordance withthe following ASTMs and the related appendix of each ASTM; D 2855 for PVC pipe and fittings and D 2235 for ABS
pipe and fittings.
Flanged, banded, heat-fusion, or elastomeric-sealed mechanical joints shall be used when joining polyethylene (PE)and high density polyethylene (HDPE) pipe and fittings unless otherwise specified in section 14 of this specification
or as shown on the drawings.
Pipe ends shall be cut square and be deburred to provide a uniform, smooth surface for the jointing process.
Reference marks shall be placed on the spigot ends to assist in determining when proper seating depth has beenachieved within the joint.

10. Fittings
Unless otherwise specified, steel fittings, valves, and bolted connections shall be painted or coated as recommended by the manufacturer.
Fittings for nonpressure pipe shall be of the same or similar material as the pipe and shall provide the same durability, watertightness, and strength as the pipe unless otherwise specified.

11. Thrust blocks and anchors
When specified, concrete thrust blocks and anchors shall be installed as shown on the drawings or specified in section 14 of this specification.
The concrete for the thrust blocks and anchors shall conform to the requirements of Construction Specification 32,
Structure Concrete, for Class 3000M concrete unless otherwise specified in section 14 of this specification.
The thrust block cavity shall be hand dug into undisturbed soil or previously placed compacted backfill. The cavity
shall be formed with soil or wood to hold the freshly placed concrete without displacement until an initial set has
occurred.
When excavation beyond the designated trench widths and depths as shown on the drawings or specified in section
14 of this specification occurs at locations where installation of concrete thrust blocks is required, the contractor shall install an alternative thrust block provision. The concrete thrust block shall have a thickness of one pipe
diameter and a contact face area that shall be formed against the pipe as shown on the drawings or specified in
section 14 of this specification. Backfill shall be placed on all sides of the thrust block and to the sides of the excavation. It shall be compacted as specified for initial backfill.

12. Pressure testing
Method 1—Pressure testing of the completed conduit is not required.
Method 2—The conduit shall be tested for leaks in the following manner:a. Before pressure testing:(1) Joints of the assembled pipeline shall be allowed to cure as recommended by the manufacturer.
(2) Pipeline shall be flushed and cleaned.
(3) All concrete anchors and thrust blocks shall be in place and allowed to cure for a minimum of 3 days.
(4) Earth backfill shall be sufficient to anchor the conduit against movement during the pressure testingand shall be compacted as specified in Section 14 of this specification or as shown on the drawings.

45–4(210–VI–NEH, January 2009)

(5) The conduit shall be braced, anchored, or both, at each end to restrict all potential pipe movement.
(6) The ends of the conduit shall be plugged. The upstream plug shall have a standpipe installed verticallyhaving a minimum diameter of 2 inches and shall be equipped with a shutoff valve. All high points inthe line shall be vented to evacuate air pockets. The conduit and the standpipe shall be slowly filledwith water such that no air is entrapped during the filling operation. After filling is complete, all vents
shall be closed.
b. During pressure testing, the water level in the standpipe shall be continuously maintained at a minimum of
10 feet above the highest invert elevation of the conduit for no less than 2 hours unless otherwise specified
in section 14 of this specification or as shown on the drawings.
The volume of water leakage in the 2-hour test period shall be recorded. The maximum allowable leakage(L) in gallons per hour shall not exceed 0.02 times the nominal pipe diameter (D) in inches for each 1,000
feet of pipe line, which is about 50 pipe joints (L = 0.02 x D).
c. When observed leakage exceeds the allowable, leaks shall be sealed by replacement of pipe and fittings
as necessary. The conduit shall be retested as described above. This procedure shall be repeated until the
conduit leakage does not exceed the allowable specified above.
The contractor shall be fully responsible for any and all work required to correct leakage exceeding theamount specified.
Method 3—The conduit shall be tested for leaks in the following manner:a. Before pressure testing:(1) Joints of the assembled pipeline shall be allowed to cure as recommended by the manufacturer.
(2) Pipeline shall be flushed and cleaned.
(3) All concrete anchor and thrust blocks shall be in place and allowed to cure for at least 3 days.
(4) Earth backfill shall be sufficient to anchor the conduit against movement during the pressure testing
and compacted as specified in section 14 of this specification or as shown on the drawings.
(5) The conduit shall be braced and/or anchored at each end to prevent all potential pipe movement.
(6) The ends of the conduit shall be plugged, and a pressure gauge shall be attached to the upstream anddownstream ends. All high points along the pipeline shall be vented to permit the complete removalof all air within the pipeline. The conduit shall be slowly filled with water such that no air is entrapped
during the filling operations.
b. The testing pressure specified in section 14 of this specification shall be continuously maintained at the
upstream gauge for a minimum of 2 hours. The pressure at the downstream gauge shall not exceed the pressure rating of the pipe.
c. The volume of water leakage for the 2-hour test period shall be recorded. Maximum allowable leakage shallbe in accordance with the following:(210–VI–NEH, January 2009)45–5

Allowable leakage for plastic pipe
(gal/hr/1,000 feet, or 50 pipe joints) 1/
Test pressure in the pipeline (lb/in2)
50
100
150
200
- - - - - - - - Allowable leakage - - - - - - -Nominalpipe size   (in)

4
6
8
10
12
14
15
16
18
1/

.19
.29
.38
.48
.57
.67
.72
.76
.86
Computation basis
L=

.27
.41
.54
.68
.81
.95
1.02
1.07
1.22

.33
.50
.66
.83
.99
1.16
1.25
1.32
1.49

.38
.57
.76
.96
1.15
1.34
1.44
1.52
1.72

ND P
7, 400where:
L = allowable leakage in gallons per hour
N = number of joints (pipe and fittings)
D = nominal diameter of pipe in inches
P = test pressure in pounds per square inchd. When observed leakage exceeds the allowable, leaks shall be sealed by replacement of pipe and fittings asnecessary. The conduit shall be retested as described in this section. The procedure shall be repeated until
the conduit leakage does not exceed the allowable specified above.
The contractor shall be fully responsible for any and all work required to correct leakage exceeding theamount specified.

13. Measurement and payment
Method 1—For items of work for which specific unit prices are established in the contract, the quantity of eachkind, size, and class of pipe is determined to the nearest foot by measurement of the laid length along the crowncenterline of the conduit. Payment for each kind, size, and class of pipe is made at the contract unit price for thatkind, size, and class. Such payment constitutes full compensation for furnishing, transporting, and installing thepipe including excavation, shoring, backfill, bedding, thrust blocks, and all fittings, appurtenances, and other items
necessary and incidental to the completion of the work. Payment for appurtenances listed separately in the bidschedule is made at the contract prices for those items.
Method 2—For items of work for which specific unit prices are established in the contract, the quantity of eachkind, size, and class of pipe is determined as the sum of the nominal laying lengths of the sections used. Payment
for each kind, size, and class of pipe is made at the contract unit price for the kind, size, and class. Such payment
constitutes full compensation for furnishing, transporting, and installing the pipe including excavation, shoring,backfill, bedding, thrust blocks, and all fittings, appurtenances, and other items necessary and incidental to thecompletion of the work. Payment for appurtenances listed separately in the bid schedule is made at the contract
prices for those items.

45–6(210–VI–NEH, January 2009)

Method 3—For items of work for which specific unit prices are established in the contract, the quantity of eachkind, size, and class of pipe is determined to the nearest foot by measurement of the laid length along the crowncenterline of the conduit. Payment for each kind, size, and class of pipe is made at the contract unit price for thekind, size, and class. Such payment constitutes full compensation for furnishing, transporting, and installing thepipe including shoring, all fittings, thrust blocks, appurtenances, and other items necessary and incidental to thecompletion of the work. Payment for appurtenances listed separately in the bid schedule is made at the contract
prices for those items.
Method 4—For items of work for which specific unit prices are established in the contract, the quantity of eachkind, size, and class of pipe is determined as the sum of the nominal laying lengths of the pipe sections used. Payment for each kind, size, and class of pipe is made at the contract unit price for that kind, size, and class. Such
payment constitutes full compensation for furnishing, transporting, and installing the pipe including shoring, allfittings, thrust blocks, appurtenances, and other items necessary and incidental to the completion of the work. Payment for appurtenances listed separately in the bid schedule is made at the contract prices for those items.
Methods 3 and 4—Excavation, backfill, and bedding is paid separately under their respective bid items.
All measurement and payment methods—Compensation for any items of work described in the contract, but
not listed in the bid schedule, is included in the payment for the item of work to which it is made subsidiary. Suchitems and items to which they are made subsidiary are identified in section 14 of this specification.

14. Items of work and construction details(210–VI–NEH, January 2009)45–7

14. Items of Work and Construction Details
In Section 2, Material, the P.V.C. plastic pipe shall be either AWWA C900, pressure class 150;
ASTM D1785, Schedule 80; or ASTM D2241, SDR 17.
In Section 6, Pipe embedment, earth bedding and pipe encased in drainfill shall apply. In addition
to the details stated in Section 6 for bedding of P.V.C. pipe, the bedding shall be as shown on thedrawings.
In Section 7, Backfill:a. Initial backfill of P.V.C. pipe shall be as shown on the drawings and as specified in Section 6,
Pipe embedment.
b. Final backfill of P.V.C. pipe shall be as shown on the drawings and as specified in Section 6,
Pipe embedment.
c. Compaction of the initial and final backfill shall be as specified in Construction Specification
24 for drainfill and Construction Specification 23 for earth backfill.
In Section 10, Fittings, fittings shall be P.V.C. and shall have a design pressure rating andexternal load-carrying capacity equal to or exceeding that specified for the pipe to which it is
attached. P.V.C. fittings shall be one-piece injection molded or fabricated from P.V.C. pipe andone-piece injection molded P.V.C. fittings. Fittings that are fabricated from one-piece injection
molded P.V.C. manufactured for solvent weld construction shall have a maximum 2'-0" stub ofspigot or bell, as appropriate, solvent welded in place to permit installation of elastomeric gasket
bell and spigot pipe to maintain articulation. The stubs shall be selected to permit the bell to face
upstream.
In Section 12, Pressure testing, Method 1 shall apply.
In Section 13, Measurement and payment, Method 3 shall apply.
In Material Specification 547, Section 3, Perforations, item c. shall not apply. Slotted pipe shallbe used. Slot dimensions and geometry shall be as shown on the drawings.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 28, Plastic Pipe, PVC, 6-Inch I.D.
(1)

This item shall consist of furnishing and installing the 6-inch diameter slotted andnon-perforated P.V.C. and the 6-inch diameter ductile iron pipes along with allnecessary fittings, couplings, and all other items and appurtenances necessary andincidental to completion of the work as shown on the drawings.

(2)This item shall consist of all 6-inch I.D. plastic pipe required for the RCC
underdrains, and foundation toe drains as shown on the drawings.

(3)

The P.V.C. pipe shall have a minimum of 2 feet of cover before traversing wheeled
equipment over the pipe.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

45-8

(4)

The item of work subsidiary to this bid item is Ductile-Iron Pipe as specified inConstruction Specification 53.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

45-9

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

45-10

Construction Specification 53—Ductile-Iron Pipe
1.

Scope

The work consists of furnishing and installing ductile-iron pipe, fittings, and appurtenances as specified in section 9of this specification and as shown on the drawings.

2. Material
Ductile-iron pipe and fittings shall conform to the requirements of Material Specification 553, Ductile-Iron Pipe.
Thickness class of pipe and rated working pressure shall be as specified in section 9 of this specification or as
shown on the drawings.
Unless otherwise specified, special fittings and appurtenances shall be the same material as the pipe.

3. Laying and bedding the pipe
Pipe shall be installed to the lines and grades shown on the drawings with bell socket ends aligned upstream unlessotherwise specified. The pipe shall be installed in accordance with the manufacturer's recommendations, unlessotherwise specified. Two copies of the pipe manufacturer's installation instructions shall be provided to the engineer before any pipe placement. The pipe shall be firmly and uniformly bedded within the trench throughout theentire length of the pipe section to the depth and in the manner specified. Bell holes for flanged, push-on, or mechanical joint pipe shall be provided as necessary to allow space for joint assembly and to permit the pipe barrel tobe uniformly supported on the bedding.
4. Joints and connections
Pipe joints shall conform to the details shown on the drawings and shall be sound and watertight at the pressures
specified in section 9 of this specification.
5. Handling the pipe
The contractor shall furnish all equipment and facilities needed to handle, store, and place the pipe without damaging the pipe, lining, encasement, or coating. Pipe coating, encasement, or lining that is damaged shall be repaired
using methods recommended by the manufacturer unless otherwise specified in section 9 of this specification.
6. Pressure testing
Pressure testing of the conduit, when specified, shall be conducted as follows:a. Placement of backfill before pressure testing shall be as specified in section 7 of this specification.
b. Before pressure testing, the pipeline shall be flushed and free of all foreign material.
c. The pipeline shall not be pressure tested until concrete for anchor and thrust blocks has attained the minimum specified compressive strength unless other specified methods of thrust restraint are provided.
d. The total conduit or continuous section of conduit to be tested shall be filled with clean water at a rate not
to exceed the maximum specified and tested at the pressure(s) specified in section 9 of this specification.
e. The section of conduit being tested shall be allowed to stand full of water for a minimum of 24 hours before
the start of pressure and leakage tests. Test pressures shall be held constant for 2 hours. When the amountof water loss exceeds the maximum allowable loss specified in section 9 of this specification, the leak(s)shall be repaired or otherwise corrected and the conduit shall be re-tested. The testing procedure shall be
repeated until the requirements of the specifications are met.

(210–VI–NEH, May 2001)

53–1

7. Backfill
Method 1—Backfill in accordance with section 9 of this specification shall be accomplished only in sufficientamount to hold the conduit in place during testing, with the following exceptions:a. Compacted backfill shall be placed to its final depth as shown on the drawings at vertical and horizontal deflection points, road crossings, and thrust blocks. Backfill shall be placed so that conduit and joint displacement does not occur.
b. All joints and connections shall be completely exposed for visual observation during testing, except at locations described in the exception above.
Method 2—Backfill in accordance with section 9 of this specification shall be to the final depth as shown on thedrawings for the section of conduit being tested.
Use with either method—The contractor shall be fully responsible for any and all work required to correct any
leakage when the leakage test results in water loss that exceeds the amount specified in section 9 of this specification.

8. Measurement and payment
For items of work for which specific unit prices are established in the contract, the quantity of each size, and thickness class of pipe is determined to the nearest foot by measurement of the installed length of pipe along the crowncenterline of the conduit. Payment for each size and thickness class of pipe is made at the contract unit price forthat size and thickness class of pipe. Such payment constitutes full compensation for furnishing, transporting, handling, and installing the pipe and necessary fittings and appurtenances complete in place.
Compensation for any item of work described in the contract, but not listed, is included in the payment for the itemof work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in
section 9 of this specification.

9.

53–2

Items of work and construction details(210–VI–NEH, May 2001)

9. Items of Work and Construction Details
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Subsidiary Item, Ductile-Iron Pipe(1)

This item shall consist of furnishing and installing one, twenty (20)-foot long, 6inch I.D. ductile-iron pipes as the termination joints for the 6-inch I.D. P.V.C.
foundation toe drain outfall line to the right of the proposed RCC spillway as
shown in the drawings.

(2)

Separate payment will not be made for this item of work. Compensation for thisitem will be included in the payment for Plastic Pipe, PVC, 6-inch I.D.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

53-3

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

53-4

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Construction Specification 61­—Rock Riprap
1.

Scope

The work consists of the construction of rock riprap revetments and blankets, including filter or bedding where specified.

2.

Material

Rock riprap must conform to the requirements of Material Specification 523, Rock for Riprap, or if so specified, must be obtained
from designated sources. It must be free from dirt, clay, sand, rock fines, and other material not meeting the required gradation limits.
At least 30 days before rock is delivered from other than designated sources, the contractor must designate in writing the source fromwhich rock material will be obtained and provide information satisfactory to the contracting officer that the material meets contract
requirements. The contractor must provide the responsible engineer free access to the source for the purpose of obtaining samples fortesting. The size and grading of the rock must be as specified in section 8.
Rock from approved sources must be excavated, selected, and processed to meet the specified quality and grading requirements at thetime the rock is installed.
Based on a specific gravity of 2.65 (typical of limestone and dolomite) and assuming the individual rock is shaped midway between asphere and a cube, typical size/weight relationships are:Sieve sizeof rock

Approx. weightof rock

Weight of test pile

16 inches

300 pounds

6,000 pounds

11 inches

100 pounds

2,000 pounds

6 inches

15 pounds

300 pounds

When specified in section 8 or when it is necessary to verify the gradation of the rock riprap, a particle size analysis must be
performed in accordance with ASTM D5519, Test Method A or B. The analysis must be performed at the work site on a test pile ofrepresentative rock. The mass of the test pile must be at least 20 times the mass of the largest rock in the pile. The results of the test
are compared to the gradation required for the project. Test pile results that do not meet the construction specifications must be cause
for the rock to be rejected. The test pile that meets contract requirements must be left on the job site as a sample for visual comparison.
The test pile must be used as part of the last rock riprap to be placed.
Filter or bedding aggregates when required must conform to Material Specification 521, Aggregates for Drainfill and Filters, unlessotherwise specified. Geotextiles must conform to Material Specification 592, Geotextile.

3.

Subgrade preparation

The subgrade surface on which the rock riprap, filter, bedding, or geotextile is to be placed must be cut or filled and graded to the linesand grades shown on the drawings. When fill to subgrade lines is required, it must consist of approved material and must conform to
the requirements of the specified class of earthfill.
Rock riprap, filter, bedding, or geotextile must not be placed until the foundation preparation is completed and the subgrade surface
has been inspected and approved.

4.

Equipment-placed rock riprap

The rock riprap must be placed by equipment on the surface and to the depth specified. It must be installed to the full course thickness
in one operation and in such a manner as to avoid serious displacement of the underlying material. The rock for riprap must be
delivered and placed in a manner that ensures the riprap in place is reasonably homogeneous with the larger rocks uniformly
distributed and firmly in contact one to another with the smaller rocks and spalls filling the voids between the larger rocks. Some handplacing may be required to provide a neat and uniform surface.
(210-VI-NEH, Amend. 2, Sept. 2018)

61–1

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Rock riprap must be placed in a manner to prevent damage to structures. Hand placing is required as necessary to prevent damage to
any new and existing structures.

5.

Hand placed rock riprap

6.

Filter or bedding

7.

Measurement and payment

The rock riprap must be placed by hand on the surface and to the depth specified. It must be securely bedded with the larger rocks
firmly in contact one to another without bridging. Spaces between the larger rocks must be filled with smaller rocks and spalls.
Smaller rocks must not be grouped as a substitute for larger rock. Flat slab rock must be laid on its vertical edge except where it is laid
like paving stone and the thickness of the rock equals the specified depth of the riprap course.
When the contract specifies filter, bedding, or geotextile beneath the rock riprap, the designated material must be placed on the
prepared subgrade surface as specified. Compaction of filter or bedding aggregate is not required, but the surface of such materialmust be finished reasonably smooth and free of mounds, dips, or windrows.
Method 1—For items of work for which specific unit prices are established in the contract, the quantity of each type of rock riprap
placed within the specified limits is computed to the nearest ton by actual weight. The volume of each type of filter or bedding
aggregate is measured within the specified limits and computed to the nearest cubic yard by the method of average cross-sectional end
areas. For each load of rock riprap placed as specified, the contractor must furnish to the responsible engineer a statement-of-delivery
ticket showing the weight to the nearest 0.1 ton.
Payment is made at the contract unit price for each type of rock riprap, filter, or bedding. Such payment is considered fullcompensation for completion of the work.
Method 2—For items of work for which specific unit prices are established in the contract, the quantity of each type of rock riprap
placed within the specified limits is computed to the nearest 0.1 ton by actual weight. The quantity of each type of filter or bedding
aggregate delivered and placed within the specified limits is computed to the nearest 0.1 ton. For each load of rock riprap placed as
specified, the contractor must furnish to the engineer a statement-of-delivery ticket showing the weight to the nearest 0.1 ton. For eachload of filter or bedding aggregate, the contractor must furnish to the responsible engineer a statement-of-delivery ticket showing theweight to the nearest 0.1 ton.
Payment is made at the contract unit price for each type of rock riprap, filter, or bedding. Such payment is considered fullcompensation for completion of the work.
Method 3—For items of work for which specific unit prices are established by the contract, the volume of each type of rock riprap andfilter or bedding aggregate is measured within the specified limits and computed to the nearest cubic yard by the method of averagecross-sectional end areas.
Payment is made at the contract unit price for each type of rock riprap, filter, or bedding. Such payment is considered fullcompensation for completion of the work.
Method 4—For items of work for which specific unit prices are established by the contract, the volume of each type of rock riprap,
including filter and bedding aggregate, is measured within the specified limits and computed to the nearest cubic yard by the methodof average cross-sectional end areas.

61–2(210-VI-NEH, Amend. 2, Sept. 2018)

Chapter 2

National Standard Construction Specification

Part 642 National Engineering Handbook

Payment is made at the contract unit price for each type of rock riprap, including filter and bedding. Such payment is considered fullcompensation for completion of the work.
Method 5—For items of work for which specific unit prices are established by the contract, the quantity of each type of rock riprap
placed within the specified limits is computed to the nearest ton by actual weight. For each load of rock for riprap placed as specified,the contractor must furnish to the responsible engineer a statement-of-delivery ticket showing the weight to the nearest 0.1 ton.
Payment is made at the contract unit price for each type of rock riprap, and includes compensation for any aggregate or geotextile
installed as specified for filter or bedding. Such payment is considered full compensation for completion of the work.
Method 6—For items of work for which specific unit prices are established by the contract, the volume of each type of rock riprap ismeasured within the specified limits and computed to the nearest cubic yard by the method of average cross-sectional end areas.
Payment is made at the contract unit price for each type of rock riprap and includes compensation for any aggregate or geotextile
installed as specified for filter or bedding. Such payment is considered full compensation for completion of the work.
All methods—The following provision applies to all methods of measurement and payment. Compensation for any item of work
described in the contract, but not listed in the bid schedule, is included in the payment for the item of work to which it is madesubsidiary. Such items and the items to which they are made subsidiary are identified in section 8.
No separate payment is made for testing the gradation of the test pile. Compensation for testing is included in the appropriate bid item
for riprap.

8.

Items of work and construction details(210-VI-NEH, Amend. 2, Sept. 2018)

61–3

8. Items of Work and Construction Details
In Section 7, Measurement and payment, Method 5 shall apply.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 30, Rock Riprap(1)This item shall include furnishing and placing the rock riprap to construct the
upstream wave protection, rock lined principal spillway outlet channel, rock-lined
RCC auxiliary spillway outlet channel, the rock scour apron upstream of the RCC
auxiliary spillway, and the scour pad on the sides of the RCC auxiliary spillway as
shown on the drawings.

(2)

Rock for use as riprap shall comply with the requirement of Material Specification
523, Rock Type 1.

(3)

The gradation requirements for rock placed at each location are shown on theconstruction drawings.

(4)

Prior to delivery of rock to the construction site, the Contractor shall provide asample load of rock weighing at least five (5) tons and shall furnish certified test
results (or other evidence satisfactory to the Engineer) showing that the rocksample furnished complies with the specified gradation. This rock sample shall bedeposited on the construction site at designated location and maintained at thislocation until rock placement has been completed. This sample shall be used as afrequent reference for judging the gradation of the riprap supplied. Any differenceof opinion between the Engineer and the Contractor concerning gradation of theriprap being delivered on the site shall be resolved by dumping and checking thegradation of one random truck load of riprap. In the event such additional checking
procedure becomes necessary, the mechanical equipment, preparation of a sorting
site, and labor needed to prove the gradation by weighing shall be provided by theContractor at no additional cost.

(5)

If, at any time, the rock is delivered to the construction site, separation orsegregation of the smaller rock fraction from the larger rock fraction has occurred,
the rock shall be reworked as necessary to ensure a reasonably uniform distributionof the various sizes prior to placement of the rock. Due care shall be exercised
during this rework operation (if required) to prevent inclusion of earth or other
undesirable materials in the riprap.

(6)

Riprap delivery shall be made only during scheduled working hours, and delivery
tickets shall be furnished to the Engineer.

(7)

Riprap may be equipment placed. Equipment shall not be allowed on the rockduring or after placement.

(8)

The item of work subsidiary to this bid item is Excavation, Common, Rock Riprap
as specified in Construction Specification 21.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

61-4

Construction Specification 71—Water Control Gates
1. Scope
The work consists of furnishing and installing water control gates including gate stems, hoists, lifts, and other appurtenances.
2. Material
The gates furnished shall conform to the requirements of Material Specifications 571, 572, and 573, as appropriate,
and as specified in section 8 of this specification and on the drawings. All gates shall be furnished complete withhoisting equipment and other specified appurtenances.
3. Installing gates
The contractor shall install the gates in a manner that prevents leakage around the seats and binding of the gates
during normal operation.
Surfaces of metal against which concrete will be placed shall be free from oil, grease, loose mill scale, loose paint,
surface rust, and other debris or objectionable coatings.
Anchor bolts, thimbles, and spigot frames shall be secured in true position within the concrete forms and maintained in alignment during concrete placement.
Concrete surfaces against which rubber seals will bear or against which flat frames or plates are to be installed
shall be finished to provide a smooth and uniform contact surface.
When a flat frame is installed against concrete, a layer of concrete mortar shall be placed between the gate frame
and the concrete.
When a gate is attached to a wall thimble, a mastic or resilient gasket shall be applied between the gate frame andthe thimble in accordance with the recommendations of the gate manufacturer.
Wall plates, sills, and pin brackets for radial gates shall be adjusted and fastened by grouting and bolting after thegates have been completely assembled in place.

4. Installing hoists and lifts
Gate stems, stem guides, and gate lifts shall be carefully aligned so that the stem shall be parallel to the guide bars
or angles on the gate frame following installation.
5. Radial gate seals
The rubber seals for radial gates shall be installed so that the seals contact the walls or wall plates throughout theentire gate length when the gate is in the closed position.
6. Operational tests
After the gate(s) and hoist(s) (or lifts) have been installed, they shall be cleaned, lubricated, and otherwise serviced
by the contractor in accordance with the manufacturer's instructions. The contractor shall test the gate and hoist
by operating the system several times throughout its full range of operation. The contractor shall make any changes or adjustments necessary to ensure satisfactory operation of the complete gate system.

(210–VI–NEH, May 2001)

71–1

7. Measurement and payment
The number of each type, size, and class of gate is counted. Payment for furnishing and installing each type, size,and class of gate shall be made at the contract unit price for that type, size, and class of gate. Such payment constitutes full compensation for all labor, equipment, material, and all other items necessary and incidental to the completion of the work including furnishing and installing anchor bolts and all specified appurtenances and fittings.
Compensation for any item of work described in the contract, but not listed in the bid schedule is included in thepayment for the item of work to which it is made subsidiary. Such items and items to which they are made subsidiary are identified in section 8 of this specification.

8.

71–2

Items of work and construction details(210–VI–NEH, May 2001)

8. Items of Work and Construction Details
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 31, Water Control Slide Gate, 12” x 12”(1)This item shall consist of furnishing and installing the 12" x 12" slide gate on theprincipal spillway inlet including the wall thimble, gate, stem, stem guides, lift
pedestal, hand wheel, wedges, and all associated appurtenances.

(2)

The gate shall conform to the requirements of Material Specification 571 for TypeMHS-2, and shall be Class 55-20, Square Opening.

(3)

Anchor bolts shall be stainless steel.

(4)

The gate frame shall be of the flat back or flange back type.

(5)

The gate stem shall be the rising type and shall be stainless steel and be of diameteras shown in the drawings or larger as recommended by the manufacturer towithstand the thrusts encountered in operation of the specified type and class gate.

(6)

Stem guides shall be adequately spaced and of sufficient number as recommended
by the manufacturer to properly support the stem during operation of the gate.

(7)

The wall bracket shall be as recommended by the manufacturer.

(8)

Hoist or lift shall be of the handwheel type as recommended by the manufacturer.

(9)

The gate shall be designed to operate satisfactorily at any degree of opening.

(10) The wall thimble shall be of cast iron and shall be Type F, 12 inches in length andshall have a square opening.
(11) All bolts shall be furnished with flat washers and lock washers or with flat washers
and double nuts for lock nuts. All washers and nuts shall be of the same materials
and have the same coatings as the bolts on which applied.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

71-3

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

71-4

Construction Specification 81—Metal Fabrication and Installation
1. Scope
The work consists of furnishing, fabricating, and erecting metalwork, including the metal parts and fasteners of thecomposite structures.
2. Material
Unless otherwise specified, material shall conform to the requirements of Material Specification 581, Metal. Steelshall be structural quality unless otherwise specified. Castings shall be thoroughly cleaned and subjected to careful inspection before installation. Finished surfaces shall be smooth and true to assure proper fit. Galvanizing shallconform to the requirements of Material Specification 582, Galvanizing.
3. Fabrication
Fabrication of structural steel shall conform to the requirements of Specification for the Design, Fabrication andErection of Structural Steel for Buildings (Riveted, Bolted and Arc-Welded Construction), American Institute of
Steel Construction.
Fabrication of structural aluminum shall conform to the requirements in the Aluminum Design Manual available
from The Aluminum Association.

4. Erection
The frame of metal structures shall be installed true and plumb. Temporary bracing shall be placed wherever necessary to resist all loads to which the structure may be subjected, including those applied by the installation andoperation of equipment. Such bracing shall be left in place as long as may be necessary for safety.
As erection progresses the work shall be securely bolted up, or welded, to resist all dead load, wind, and erection
stresses. The contractor shall furnish such installation assisting bolts, nuts, and washers as may be required.
No riveting or welding shall be performed until the structure is stiffened and properly aligned.
Rivets driven in the field shall be heated and driven with the same care as those driven in the shop.
All field welding shall be performed in conformance to the requirements for shop fabrication except those that
expressly apply to shop conditions only.

5. Protective coatings
Items specified to be galvanized shall be completely fabricated for field assembly before the application of the zinccoatings. Galvanized items shall not be cut, welded, or drilled after the zinc coating is applied.
Items specified to be painted shall be painted in conformance to the requirements of Construction Specification 82
for the specified paint systems.

(210–VI–NEH, May 2001)

81–1

6.

Measurement and payment

Method 1—The work is not measured. Payment for metal fabrication and installation is made at the contract lumpsum price in the contract. Such payment constitutes full compensation for all labor, equipment, material, and allother items necessary and incidental to the completion of the work including connectors and appurtenances, suchas rivets, bolts, nuts, pins, studs, washers, hangers, and weld metal.
Method 2—The weight of metal installed complete in place shall be determined to the nearest pound. Unless otherwise specified, the weight of metal shall be computed by the method specified in section 3 of the Code of Standard Practice for Steel Buildings and Bridges, American Institute of Steel Construction, except that the following
unit weights shall also be used, as appropriate, as the basis of computation:
Material

Unit weight(lb/ft3)

Aluminum alloy

173

Bronze or copper alloy

536

Iron, malleable

470

Iron, wrought

487

Payment for furnishing, fabricating, and installing metalwork is made at the contract unit price for the specified
types of labor, material, equipment, and all other items necessary and incidental to the completion of the work.
Method 3—The work is not measured. Payment for furnishing, fabricating, and installing each item of metalwork
is made at the contract price for that item. Such payment constitutes full compensation for all labor, equipment,material, and all other items necessary and incidental to the completion of the work including connectors and appurtenances, such as rivets, bolts, nuts, pins, studs, washers, hangers, and weld metal.
All methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed in the bid schedule, is included in the payment for the item ofwork to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in
section 7 of this specification.

7.

81–2

Items of work and construction details(210–VI–NEH, May 2001)

7. Items of Work and Construction Details
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 32, Metal Fabrications(1)

This item shall consist of furnishing, fabricating, and installing metal works for thefollowing:(a)Trash rack for the new principal spillway inlet;(b)

Manhole frame and cover for the new principal spillway inlet;(c)

Metal frames and covers for the foundation toe drain cleanouts and RCC
drainage system cleanouts;(d)Metal reservoir staff gauge; and(e)

Rodent guards for drain outfalls through principal spillway impact basin
and outfalls on RCC spillway.

(2)

In Section 6, Measurement and payment, Method 1 shall apply. Payment for thisbid item shall include full compensation for the concrete required for thefoundation cleanout covers as shown in the construction drawings.

(3)

All metal parts shall be galvanized after fabrication, with the exception of the
manhole and cleanout frames and covers and any stainless steel hardware.

(4)

Submit shop drawings of all fabricated steel and miscellaneous metalwork items
for review and approval by the Contracting Officer or Engineer including all
dimensions, sizes, finishes, fasteners, welds, and relationship of work to adjoining
construction. Riveted connections will not be permitted.

(5)

For standard manufactured items, submit catalog worksheets showing illustrated
cuts of items to be furnished, including scale details, dimensions, and materials of
construction for review and approval by the Contracting Officer or Engineer.

(6)

The rodent guards shall be fabricated as shown on the drawings. The metal straps
and bars shall be galvanized or painted with two coats of zinc oxide paint after
fabrication. The guards shall be bolted to the impact basin sidewalls as shown on
the drawings to allow for periodic inspection and maintenance of the outfall pipes.

(7)

The principal spillway inlet structure manhole cover shall be Neenah Foundry
Company R-6078 round series with Type E locking device including stainless steel
cap screws or equivalent as approved by the Contracting Officer or Engineer. If an
approved equivalent is used, it shall have a similar locking device.

(8)

The foundation toe drain cleanout covers and hardware shall be as shown on thedrawings or equal approved by the Engineer. The flush mount cleanout covers
shall be lockable, hinged, watertight lids secured either to the casing or concrete

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

81-3

pad. Provide padlocks for each cleanout location. All padlocks shall be keyed thesame. R-1470-E(9)

Metalwork with damaged galvanized surfaces shall be repaired or replaced at no
additional cost to the Owner. Field repairs of galvanized surfaces shall be madeusing “Galvinox,” “Galvo-Weld,” or similar commercially available galvanizing
repair material meeting the requirements of Mil Spec P-21035 and must contain aminimum of 90 percent zinc by weight in dry film. Apply in accordance with the
manufacturer’s instructions.

(10)

Epoxy grout shall be fast curing, no sag, and no drip. It should be able to beinstalled in damp holes, and in a temperature range of 104°F down to 23°F. The
epoxy shall be capable of developing the ultimate strength of the embedded anchor
when installed in Class 4000 concrete.

b. Subsidiary Item, Fence Stiles(1)This item shall consist of furnishing, fabricating, galvanizing, and installing thefence stile as shown on the drawings.

(2)

Separate payment will not be made for this item of work. Compensation for thisitem will be included in the payment for the bid item for Fence, Barbed Wire.

c. Subsidiary Item, Chain Link Fence Post Base Plates(1)This item shall consist of furnishing, fabricating, galvanizing, and installing thechain link fence post base plates as shown on the drawings.

(2)

Separate payment will not be made for this item of work. Compensation for thisitem will be included in the payment for the bid item for Fence, Chain Link.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

81-4

Construction Specification 91—Chain Link Fence
1. Scope
The work consists of furnishing and installing chain link fencing complete with all posts, braces,
gates, and all other appurtenances.
2. Material
The material for the chain link fence must be as follows:
Galvanized
Chain link fence fabric must conform to the requirements of ASTM A392, 2-inch mesh and 9gauge galvanized steel wire. Zinc coating must be class 2.
Posts and fence framework must conform to the requirements of ASTM F1043 Group 1A, for
Heavy Industrial Fence. Coatings must be a type A galvanized coating for internal and externalsurfaces. Steel pipe posts must conform to the requirements of ASTM F1043 and F1083.
Fence fittings must conform to the requirements of ASTM F626. Fittings must be galvanizedsteel. Wire ties and clips must be 9 gauge.
Gates, gateposts, and gate accessories must conform to the requirements of ASTM F900. Coatingmust be the same as selected for adjoining fence and framework.
Barbed wire must be 12.5 gauge and must conform to the requirements of ASTM A121, chain
link fence grade.
Galvanized and PVC coated
Chain link fence fabric must conform to the requirements of ASTM F668 for class 2a or 2b, 2inch mesh, and 9-gauge galvanized steel wire. The fabric must have a polymer top coating of thecolor specified in section 6.
Posts and fence framework must conform to the requirements of ASTM F1043 Group 1A, for
Heavy Industrial Fence. Coatings must be a type-A galvanized coating for internal and externalsurfaces and covered with a polymer top coating of color as specified in section 6.
Fence fittings must conform to the requirements of ASTM F626. Fittings must be galvanizedsteel with a polymer top coating of color as specified in section 6.
Any damage to the coating must be repaired in accordance with the manufacturer’s
recommendations, or the damaged fencing material must be replaced. The contractor must
provide the engineer a copy of the manufacturer’s recommended repair procedure and materials
before correcting damaged coatings.

3. Installing fence posts
Unless otherwise specified, line posts must be placed at intervals of 10 feet measured from centerto center of adjacent posts. In determining the post spacing, measurement is made parallel withthe ground surface.

(210-VI-NEH, Amend. 2, Sept. 2018)

91-1

Posts must be set in concrete backfill in the manner shown on the drawings.
Posts set in the tops of concrete walls must be grouted into preformed holes to a depth of 12
inches.
Posts may be attached to base plates that are bolted to the concrete. Bolts must be epoxied into
drilled holes to a depth recommended by the bracket manufacturer. Alternatively, the base plates
may have a stem that is epoxied into a hole in the concrete or a saddle that is bolted with aminimum of two bolts that pass from side to side through the wall. Bolts must be stainless steel
with stainless steel lock washers and nuts.
All corner posts, end posts, gateposts, and pull posts must be embedded, braced, and trussed asshown on the drawings or in accordance with appropriate industry practice if not otherwise shownor specified.

4. Installing wire fabric
Fencing fabric must not be stretched until at least 4 days after the posts are grouted into walls or 7days after the posts are set in the concrete backfill.
Fencing fabric must be installed on the side of the posts designated on the drawings.
The fabric must be stretched taut and securely fastened by means of tie clips to the posts atintervals not exceeding 15 inches and to the top rails or tension wires at intervals not exceeding 2
feet. Care must be taken to equalize the fabric tension on each side of each post.
Barbed wire must be installed as shown on the drawings and must be pulled taut and fastened toeach post or arm with the tie wires or metal tie clips.

5. Measurement and payment
Method 1—The length of fence is measured to the nearest 0.1 foot along the fence, including
gates. Payment is made at the contract unit price for the specified height of fence. Such payment
constitutes full compensation for all labor, material, equipment, and all other items necessary andincidental to the completion of the work.
Method 2—The length of fence is measured to the nearest 0.1 foot along the fence, excluding
gate openings. Payment is made at the contract unit price for the specified height of fence. The
number of each size and type of gate installed is determined. Payment is made at the contract unit
price for that type and size of gate. Such payment constitutes full compensation for all labor,material, equipment, and all other items necessary and incidental to the completion of the work.
All methods—The following provisions apply to all methods of measurement and payment.
Compensation for any item of work described in the contract, but not listed in the bid schedule, is
included in the payment for the item of work to which it is made subsidiary. Such items and theitems to which they are made subsidiary are identified in section 6 of this specification.

6. Items of work and construction details

91- 2(210-VI-NEH, Amend. 2, Sept. 2018)

6. Items of Work and Construction Details
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 33, Fence, Chain Link
(1)

This item shall consist of furnishing all materials required and all work necessary
for the installation of the chain link fence for the principal spillway impact basin
and auxiliary spillway sidewalls as shown on the drawings.

(2)

In Section 2, Material, chain link fence materials shall be Galvanized only and not
PVC coated.

(3)

The chain link fence posts shall be installed as shown on the drawings.

(4)Standard of Manufacture: Standards of Manufacture for fence and gates shallcomply with the standards of the Chain Link Fence Manufacturer’s InstituteProduct Manual and applicable referenced ASTM standards.

(5)

Provide chain link fence as a complete unit produced by a single manufacturer,
including necessary erection accessories, fittings, and fastenings.

(6)

Contractor shall have been in the fence installation business for at least two years.
Contractor shall provide laborers and supervisors who are thoroughly familiar withthe type of construction involved and materials and techniques specified.

(7)

Deliver materials and accessories in packed cartons or firmly tied rolls, in an
undamaged condition. Equipment shall be delivered in original packages withlabels intact and identification clearly marked.

(8)

Materials and components shall be protected from the weather, humidity,
temperature variations, dirt, dust, or other contaminants.

(9)

Upon receipt at the job site, all materials and components shall be checked toensure that no damage occurred during shipping or handling. Materials shall be
stored in such a manner to ensure proper ventilation and drainage, and to protect
against damage, weather, vandalism, and theft.

(10) Materials or components damaged prior to acceptance shall be replaced at no costto the Government.
(11) In Section 5, measurement and payment shall be by Method 1.
(12) Item of work subsidiary to this bid item are:(a)

Chain Link Fence Post Base Plates as specified in Construction
Specification 81 as it applies to this bid item.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

91-3

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

91-4

Construction Specification 92—Field Fence
1. Scope
The work shall consist of furnishing and installing field fence, including gates and fittings.
2. Material
Material for field fence shall conform to the requirements of Material Specification 591. All wooden posts shall beof the same species, when available.
Unless otherwise specified, surfacing, cutting, and boring of preservative treated wooden posts and braces shallbe completed before treatment. If field cutting or field repair of treated material is approved, all cuts and abrasions
shall be carefully trimmed and coated with copper naphthenate preservative containing a minimum of 2.0 percent
copper metal. The treatment preservative shall be applied according to the product label. Any excess preservative
not absorbed by the wood member shall be cleaned from the surface prior to the use of the member. Bored holes
for connectors or bolts may be treated by pumping coal-tar roofing cement meeting ASTM D5643 into the holes
using a caulk gun or similar device. After assembly, any unfilled holes shall be plugged with tightly fitting wooden
plugs that have been treated with preservative as specified.

3. Setting posts
Concrete or wood posts shall be set in holes and backfilled with earth except where otherwise specified. Woodposts may be driven when approved by the engineer. Steel posts shall be driven unless otherwise specified.
Holes for installing fence posts shall be at least 6 inches larger than the diameter or side dimension of the posts.
Earth backfill around posts shall be thoroughly tamped in layers not thicker than 4 inches and shall completely
fill the posthole up to the ground surface. Concrete backfill around posts shall be rodded into place in layers not
thicker than 12 inches and shall completely fill the posthole to the surface of the ground. Backfill, either earth orconcrete, shall be crowned-up around posts at the ground surface.
No stress shall be applied to posts set in concrete for a period of not less than 24 hours following the developmentof a firm set of the concrete.

4. Corner assembly
Unless otherwise specified in section 11, corner assemblies shall be installed at all points where the fence alignment changes 15 degrees or more.
5. End panels
End panels shall be built at gates and fence ends.
6. Pull post assembly
Pull post assembly (bracing within a section of straight fence) shall be installed at the following locations:a. In straight fence sections, at intervals not to exceed 660 feet.
b. At any point where the vertical angle described by two adjacent reaches of wire is upward and exceeds 10
degrees (except as provided in section 11 of this specification).
c. At the beginning and end of each curved fence section.

(210–VI–NEH, January 2009)

92–1

7. Attaching fencing to posts
The fencing shall be stretched and attached to posts as follows:a. The fencing wire or netting shall be placed on the side of the post opposite the area being protected except
for installation along curved sections.
b. The fencing wire or netting shall be placed on the outside for installation along curved sections.
c. The fencing wire or netting shall be fastened to each end post, corner post, and pull post by wrapping eachhorizontal strand around the post and tying it back on itself with not less than three tightly wound wraps.
d. The fencing wire or netting shall be fastened to wooden line posts by means of steel staples. Woven-wirefencing shall be attached at alternate horizontal strands. Each strand of barbed wire shall be attached toeach post. Steel staples shall be driven diagonally with the grain of wood and at a slight downward angle
and shall not be driven so tightly as to bind the wire against the post.
e. The fencing wire or netting shall be fastened to steel or concrete line posts with either two turns of 14 gauge
galvanized steel or iron wire or in accordance with recommendations provided by the post's manufacturer.
f. Wire shall be spliced by means of a Western Union splice or by suitable splice sleeves applied with a tool
designed for that purpose. The Western Union splice shall have no less than eight wraps of each end about
the other. All wraps shall be tightly wound and closely spaced. Splices made with splice sleeves shall have atensile strength no less than 80 percent of the strength of the wire being spliced.

8. Stays
Stays shall be attached to the fencing at the spacing outlined in section 11 or as shown on the drawings to ensure
maintenance of the proper spacing of the fence wire strands.
9. Crossings at depressions and watercourses
Where fencing is installed parallel to the ground surface, the line posts subject to upward pull shall be anchored.
a. If the fence wire or netting is installed parallel to the ground surface, the line posts subject to uplift shall beanchored by means of extra embedment or by special anchors as detailed on the drawings.
b. If the fence wire is installed with the top wire straight and parallel to the ground surface on either side ofthe depression, extra length posts shall be used to allow normal post embedment. Unless otherwise specified, excess space between the bottom of the fence and the ground shall be closed with extra strands ofbarbed wire or with netting.

10. Measurement and payment
Method 1—The length of each type and kind of fence is measured to the nearest foot along the profile of the fence,
including gate openings. Payment for each type and kind of fence is made at the contract unit price for that typeand kind of fence. Such payment constitutes full compensation for completion of the work, including fabricating
and installing gates.
Method 2—The length of each type and kind of fence is measured to the nearest foot along the profile of the fence,
excluding gate openings. Payment is made at the contract unit price for the specified height of fence. The numberof each size and type of gate installed is determined. Payment is made at the contract unit price for that type andsize of gate. Such payment constitutes full compensation for all labor, material, equipment, and all other items necessary and incidental to the completion of the work.
All methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed in the bid schedule, is included in the payment for the item ofwork to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in
section 11 of this specification.

11. Items of work and construction details

92–2(210–VI–NEH, January 2009)11. Items of Work and Construction Details
In Section 10, Measurement and payment, Method 1 shall apply.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 34, Fence, Barbed Wire
(1)

This item shall consist of furnishing all materials required and constructing fencesof the type designated on the drawings, including the barbed wire fence for the
principal spillway impact basin. This item shall include six (6) gates in locations
shown on drawings.

(2)

The approximate location of the fences to be constructed is shown on theconstruction drawings. The final location of the fences (including corners, gates,pull and brace panels, stiles and special anchorage) shall be as staked by theEngineer.

(3)

The items of work subsidiary to this bid item are Fence Stiles as specified inConstruction Specification 81.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

92-3

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

92-4

Construction Specification 94—Contractor Quality Control
1. Scope
The work consists of developing, implementing, and maintaining a quality control system to ensure that the specified quality is achieved for all materials and work performed.
2. Equipment and materials
Equipment and material used for quality control shall be of the quality and condition required to meet the test
specifications cited in the contract. Testing equipment shall be properly adjusted and calibrated at the start of operations and the calibration maintained at the frequency specified. Records of equipment calibration tests shall beavailable to the engineer at all times. Equipment shall be operated and maintained by qualified operators as prescribed in the manufacturer's operating instructions, the references specified, and as specified in section 10 of thisspecification. All equipment and materials used in performing quality control testing shall be as prescribed by thetest standards referenced in the contract or in section 10.
All equipment and materials shall be handled and operated in a safe and proper manner and shall comply with allapplicable regulations pertaining to their use, operation, handling, storage, and transportation.

3. Quality control system
Method 1—The contractor shall develop, implement, and maintain a system of quality control to provide the specified material testing and verification of material quality before use. The system activities shall include proceduresto verify adequacy of completed work, initiate corrective action to be taken, and document the final results. The
identification of the quality control personnel and their duties and authorities shall be submitted to the contracting
officer in writing within 15 calendar days after notice of award.
Method 2—The contractor shall develop, implement, and maintain a system adequate to achieve the specified
quality of all work performed, material incorporated, and equipment furnished before use. The system establishedshall be documented in a written plan developed by the contractor and approved by the contracting officer. The
system activities shall include the material testing and inspection needed to verify the adequacy of completed workand procedures to be followed when corrective action is required. Daily records to substantiate the conduct of thesystem shall be maintained by the contractor. The quality control plan shall cover all aspects of quality control andshall address, as a minimum, all specified testing and inspection requirements. The plan provided shall be consistent with the planned performance in the contractor's approved construction schedule. The plan shall identify thecontractor's onsite quality control manager and provide an organizational listing of all quality control personnel
and their specific duties. The written plan shall be submitted to the contracting officer within 15 calendar days after
notice of award. The contractor shall not proceed with any construction activity that requires inspection until thewritten plan is approved by the contracting officer.
All methods—The quality control system shall include, but not be limited to, a rigorous examination of construction material, processes, and operation, including testing of material and examination of manufacturer's certifications as required, to verify that work meets contract requirements and is performed in a competent manner.

(210–VI–NEH, January 2009)94–1

4. Quality control personnel
Method 1—Quality control activities shall be accomplished by competent personnel. A competent person is: One
who is experienced and capable of identifying, evaluating, and documenting that materials and processes being
used will result in work that complies with the contract; and, who has authority to take prompt action to remove,
replace, or correct such work or products not in compliance. Off-site testing laboratories shall be certified or inspected by a nationally recognized entity. The Contractor shall submit to the Contracting Officer, for approval, laboratory certification or inspection information. The Contractor shall submit to the Contracting Officer, for approval,
the names, qualifications, authorities, certifications, and availability of the competent personnel who will performthe quality control activities.
Method 2—Quality control activities shall be accomplished by competent personnel who are separate and apartfrom line supervision and who report directly to management. A competent person is one who is experienced andcapable of identifying, evaluating, and documenting that material and processes being used will result in workthat complies with the contract, and who has authorization to take prompt action to remove, replace, or correctsuch work or products not in compliance. Offsite testing laboratories shall be certified or inspected by a nationallyrecognized entity. The Contractor shall submit to the Contracting Officer, for approval, laboratory certification or
inspection information. The contractor shall submit to the contracting officer, for approval, the names, qualifications, authorities, certifications, and availability of the competent personnel who will perform the quality control
activities.

5. Post-award conference
The contractor shall meet with the contracting officer before any work begins and discuss the contractor's quality
control system. The contracting officer and the contractor shall develop a mutual understanding regarding the quality control system, including procedures for correcting quality control issues.
6. Records
The contractor's quality control records shall document both acceptable and deficient features of the work andcorrective actions taken. All records shall be on forms approved by the contracting officer, be legible, and be dated
and signed by the competent person creating the record.
Unless otherwise specified in section 10 of this specification, records shall include:
a. Documentation of shop drawings including date submitted to and date approved by the contracting officer,
results of examinations, any need for changes or modifications, manufacturer's recommendations and certifications, if any, and signature of the authorized examiner.
b. Documentation of material delivered including quantity, storage location, and results of quality control
examinations and tests.
c. Type, number, date, time, and name of individual performing quality control activities.
d. The material or item inspected and tested, the location and extent of such material or item, and a description of conditions observed and test results obtained during the quality control activity.
e. The determination that the material or item met the contract provisions and documentation that the engineer was notified.
f. For deficient work, the nature of the defects, specifications not met, corrective action taken, and results ofquality control activities on the corrected material or item.

7. Reporting results
The results of contractor quality control inspections and tests shall be communicated to the engineer immediately
upon completion of the inspection or test. Unless otherwise specified in section 10, the original plus one copy of
all records, inspections, tests performed, and material testing reports shall be submitted to the engineer within one

94–2(210–VI–NEH, January 2009)

working day of completion. The original plus one copy of documentation of material delivered shall be submitted
to the engineer before the material is used.

8. Access
The contracting officer and the engineer shall be given free access to all testing equipment, facilities, sites, andrelated records for the duration of the contract.
9. Payment
Method 1—For items of work for which lump sum prices are established in the contract, payment is made as thework proceeds, after presentation by the contractor of invoices showing related costs and evidence of charges bysuppliers, subcontractors, and others for furnishing supplies and work performed. If the total of such payments isless than the lump sum contract price for this item, the remaining balance is included in the final contract payment.
Payment of the lump sum contract price constitutes full compensation for completion of the work.
Payment is not made under this item for the purchase cost of material and equipment having a residual value.
Method 2—For items of work for which lump sum prices are established in the contract, payment is prorated andpaid in equal amounts on each monthly estimate. The number of months used for prorating shall be the number
estimated to complete the work. The final month's prorate amount is made with the final payment. Payment as
described above constitutes full compensation for completion of the work.
Payment is not made under this item for the purchase cost of material and equipment having a residual value.
All methods—Compensation for any item of work described in the contract, but not listed in the bid schedule, is
included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they
are made subsidiary are identified in section 10.

10. Items of work and construction details(210–VI–NEH, January 2009)94–3

10. Items of Work and Construction
In Section 3, Quality control system, Method 2 shall apply, except that the written plan shall be
submitted to the Contracting Officer within 10 calendar days after notice of award.
In Section 4, Quality control personnel, Method 2 shall apply.
In Section 9, Payment, Method 2 shall apply.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 35, Contractor Quality Control(1)This item shall consist of furnishing all equipment, tools, materials, and labor andperforming all work to accomplish the work defined in Section 1 of thisspecification.

(2)

The burden of proof that work performed meets contract requirements rests upon
the Contractor. Quality assurance inspections and tests by the Government are forthe sole benefit of the Contracting Local Organization (CLO). The use of suchwords as "as approved by the Engineer or Contracting Officer" and words of like
import in the specifications or drawings which refer to approval by the Contracting
Officer are considered to be a part of the Government's Quality Assurance programand do not relieve the Contractor in any part for the Contractor's Quality Control
Responsibilities as specified.

(3)

Quality Control is defined as a rigorous examination and inspection of construction
materials, processes and operations to verify that the work being performed meets
contract requirements and shall be performed by a qualified Inspector employed byor under contract to the Contractor. The Contractor’s Inspector shall have thefollowing qualifications, and the Contractor shall submit a resume for review andapproval by the Engineer:

(4)

(a)

Minimum 5 years construction experience, with full-time construction
oversight experience on at least 2 dam rehabilitation projects.

(b)

Bachelors Degree from an accredited university in engineering,
construction, or a related field.

(c)

Field experience with oversight and testing of earthwork (including
embankment fill compaction), lime treatment, reinforced concrete
structures, and roller compacted concrete (RCC). (d)National
Institute for Certification in Engineering Technologies (NICET)
Certification Soils Level I or higher and Concrete Level 1 or higher.

The Contractor's quality control system shall be approved and operational before
commencement of work. The Contractor’s Quality Control Personnel shall submit
to the on-site NRCS Inspector Daily Quality Control Reports, for each day theContractor is on site performing work.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

94-4

(5)

Quality control tests shall be conducted in accordance with the standard test
methods identified in the specifications. The Contractor shall provide all equipment
required to perform all quality control tests. Testing equipment shall meet therequirements as specified by ASTM test methods and be properly calibrated andserviced.

(6)

All mention of inspection or Inspector in (7) and (8) below is referring to work
performed by the Contractor's Quality Control Personnel unless otherwise noted.

(7)

The degree of quality control specified shall be defined as:

(8)

(a)

Periodic review or inspection is defined as the intermittent presence of theInspector to observe construction operations and/or perform tests and takemeasurements as needed to determine and document that the work being
performed complies with the specifications.

(b)

Full-time inspection is defined as the full-time presence of the Inspector toobserve one or more construction operations and/or perform tests and takemeasurements at critical points in various operations to determine anddocument that the work being performed complies with the specifications
and to be available for consultation in case of emergency or changes inwork conditions.

(c)Continuous inspection is defined as the continuous presence of theInspector to observe one construction operation and/or perform tests andtake measurements at critical points in the operation to determine anddocument that the work being performed complies with the specifications
and to be immediately available for consultation in case of emergency orchanges in work conditions.

The Contractor's inspection system shall include the following items of work thatwill require the Contractor's quality control. Any item of work not listed below
shall be performed or constructed as shown on the drawings and as specified in theconstruction and material specifications.
(a)

The Contractor's inspection on all items not listed in (b) through (n) below
shall consist of periodic review of those items to assure that all contract
specifications are being met and that the items are being properly installedor carried out.

(b)

Seeding, Sprigging, and Mulching - Quality control shall consist ofdetermining that the vegetative materials supplied comply with thespecifications; that the areas to be vegetated are properly prepared,smoothed and graded; and that sprigging is performed as specified. Fulltime inspection shall be required.

(c)

Excavation - Quality control shall consist of full-time inspection todetermine that all excavation is being accomplished as specified and thatthe specified excavation has removed all required or unsuitable materials
and that grades are properly documented. The Inspector shall determinethat all materials selected for use in backfill of the specified works are free

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

94-5

of undesirable materials and that all materials are placed in the designatedwaste, stockpile or fill areas.
(d)Earthfill - Quality control shall consist of full-time inspection of earthfill
placement. The Inspector shall select materials from the required
excavations, stockpiles, and/or borrow area(s) to ensure the completed
earthfills are constructed in accordance with the drawings andspecifications. Sampling of as-compacted earthfill may be required in someinstances at the direction of the Engineer.
The Inspector shall select and obtain representative samples of thematerials and have moisture-density curves made (according to ASTM
D698 test procedures) of each Unified Soil Classification material to beplaced in the specified earthfills using Class A compaction. Moisturedensity curves shall be completed as necessary to provide data needed
when earthfill operations begin and may be needed as earthfill progresses
to ensure correct selection and specified compaction of earthfill materials.
A “One-Point Family of Curves Method” (hereafter referred to as the onepoint method) shall be employed to determine the optimum moisture andmaximum density values for all earthfill materials. The procedure for
performing the one-point method is as follows: (1) construct a family of
curves using compaction test data compiled on soil samples tested inaccordance with the procedure set forth in ASTM D698, (2) make a onepoint compaction test specimen from soil material representing the earthfillmaterial that is being placed (moisture content shall be on the dry side of
optimum), (3) plot the one-point moisture-density values, obtained fromthe test, on the family of curves, (4) using the curves above and below theplotted point as a guide, draw a new compaction curve through the plotted
point, (5) use this curve as the control for the moisture and density of thematerial being placed. Unless otherwise directed by the Engineer, at least
one one-point test shall be conducted for every three in-place moisturedensity tests that are taken. Required quality control testing methods andfrequency for field compaction verification shall be as follows:•••

In-place Moisture-Density by Nuclear Method (ASTM D6938):• 1 per 10,000 SF of each compacted lift or every 500 LF of dam
length of each compacted lift, whichever is more frequent
In-place Density by Sand Cone Method (ASTM D1556):• 1 per 10 tests nuclear method tests
In-place Moisture Content by Laboratory Method (ASTM D2216):• 1 per 10 tests nuclear method tests

More frequent tests shall be required if compaction requirements are notbeing obtained or if compaction requirements are not being met or if
earthfills are being placed in critical areas such as conduit and concrete
backfills and cutoff backfills. In the event that compaction correlation or
requirements are not being met, continuous inspection shall be required
during all earthfill and backfill placement to determine that foundation
conditions are satisfactory; that earthfills materials are of the type selected
for placement and are free of undesirable materials; that proper compaction
NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

94-6

and moisture requirements are being maintained; and that hand andmechanical compaction are being accomplished as specified.
The Contractor is responsible for pre-construction testing of soil materials
in potential borrow sources to confirm suitability materials for earthfill inaccordance with the criteria specified on the Drawings. The Contractor isalso responsible for ongoing quality control testing during construction to
identify potential changes in material type. Testing shall be performed in
the borrow area, although supplemental testing of the as-placed earthfill
may also be required by the Inspector. The required quality control testing
methods and frequency shall be as follows:
Gradation (ASTM D422/6913):

2 per borrow area and every 2,500 CY

Atterberg limits (ASTM D4318): 2 per borrow area and every 2,500 CY
Crumb Test (ASTM D6572):

2 per borrow area and every 2,500 CYStandard Proctor (ASTM D698): 1 per borrow area and every 10,000 CY
Pinhole Test (ASTM D4647):

1 per borrow area and every 10,000 CY(e)Drainfill - Quality control shall consist of full-time inspection of drainfill
placement. It shall include testing of the gradation of drainfill material;
determining that the material complies with specified qualities and that the
specified compaction is accomplished and the grades are properly
documented. The Inspector shall have at least two (2) sieve analyses
prepared for each type of drainfill placed. These analyses shall be madefrom materials as delivered to the job site. If changes in gradation ofdrainfill appear to develop, additional sieve analysis shall be made.
Required quality control testing frequency for verification of fieldcompaction is the same as listed for Earthfill in Section 10.a.8.d of thisspecification. Sampling of as-compacted drainfill may be required in someinstances at the direction of the Engineer.

(f)Lime Treated Earthfill - Quality control shall consist of full-time inspectionof lime treated earthfill mixing, curing, placement, and compaction. The
Inspector shall select materials from the required excavations, stockpiles,
borrow area(s), and/or lime mixing areas to ensure the completed earthfills
are constructed in accordance with the drawings and specifications.
Sampling of as-compacted lime treated earthfill may be required in someinstances at the direction of the Engineer
Required quality control test methods and testing frequency for verificationof field compaction are the same as those for listed for Earthfill in Section
10.a.8.d of this specification.
Additional quality control sampling and testing criteria to verify material
characteristics and lime treatment application rates are listed in the Items ofWork for Construction Specification 28, Lime Treated Earthfill.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

94-7

(g)

Reinforced Concrete - Quality control shall consist of continuous
inspection during the placement of concrete. In addition, the Inspector shallassure that the concrete design mix meets contract requirements and thatproper certifications are provided. The Inspector shall inspect all formwork
prior to concrete placement to assure integrity of the forms and compliancewith design detail with proper documentation. Slump, time of cement
induction, and temperature and air content measurements shall be
determined on each mixer load of concrete prior to placement to assurecompliance with specifications. Three sets of compressive strength
cylinders (4 cylinders each) will be taken from each pour. One cylinderfrom each set shall be tested at 7 days and the other two tested at 28 days.
The remaining cylinder shall be tested, if necessary, to verify results of asuspect cylinder. The Inspector shall also assure that the concrete is cured
according to specifications, the forms removed as specified and theconcrete is repaired and finished as required.

(h)

Steel Reinforcement - Quality control shall consist of continuous
inspection during concrete placement. The Inspector shall also determinethat the steel reinforcement complies with the specified quality and isplaced in accordance with the drawings and specifications with proper
documentation. The Inspector shall check to determine that it is adequately
secured to prevent its displacement during concrete placement and that it
has not been displaced during concrete placement. These inspections shallalso take place immediately before and during placement of the concrete.

(i)Roller Compacted Concrete (RCC) – Quality control shall consist ofcontinuous inspection during the installation of the RCC. The Inspector
shall ensure that the cement and pozzolan meet temperature and storage
requirements. The Inspector shall ensure that the mix produced meets thejob mix and proper documentation is furnished. The Inspector shallperform the uniformity tests as specified in Construction Specification 36
and measure and record temperature of RCC. The inspector shall determine
the average maximum density on the test fills and check density on the fill.
The Inspector shall also ensure the RCC is cured according to
specifications.

(j)Reinforced Concrete Pressure Pipe Spillway Conduits - Quality control
shall consist of continuous inspection while the pipe is being installed. The
Inspector shall also determine and document that the pipe meets the
specified requirements, that the pipe has not been damaged in shipment anddelivery, that the pipe is properly bedded and laid at specified grade andalignment and that all joints are fully closed and properly sealed.

(k)

PVC Plastic Pipe - Quality control shall consist of continuous inspection
during the installation of the PVC plastic pipe. The Inspector shalldetermine and document that the PVC plastic pipe and fittings comply withthe specifications, that the perforations are to the size and orientation
specified, that the pipe is installed at the lines and grades shown on thedrawings and as specified and that the pipe is properly bedded andcarefully backfilled.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

94-8

(9)

(l)

Rock Riprap - Quality control shall consist of full-time inspection during
the placement of the rock riprap. The Inspector shall also determine thatthe rock riprap complies with the specified quality and gradation limits;that proper certifications are provided; that the rock is placed as shown on
the drawings and as specified and that segregation of particle sizes has notoccurred during delivery or placement. At least one onsite gradation test
will be made by the Contractor.

(m)

Riprap Bedding - Quality control shall consist of full-time inspection
during the placement of the rock riprap. The Inspector shall also determinethat the rock riprap complies with the specified quality and gradation
limits; that proper certifications are provided; that the rock is placed asshown on the drawings and as specified and that segregation of particle
sizes has not occurred during delivery or placement. At least one onsite
gradation test will be made by the Contractor.

(n)Metal Fabrication - Quality control shall consist of periodic inspection
during installation of metalwork. The Inspector shall determine anddocument the fabricated metal work meets material specifications anddimensions, coatings are applied according to specifications and theerected work is to the lines and grades specified.

(o)

Geotextile - Quality control shall consist of continuous inspection during
the installation of the geotextile. The Inspector shall determine anddocument that the geotextile complies with the specifications, that the
subgrade has been excavated and smoothed to grade, that the geotextile isinstalled in accordance with the plans and specifications and that thegeotextile is not punctured, damaged or caked with mud during installation.

(p)

Conduit Abandonment - Quality control shall consist of continuous
inspection during the placement of grout inside the conduit. In addition, theInspector shall assure that the grout design mix meets contract
requirements, that conduit is properly prepared, and that the grout isproperly placed to prevent voids or air pockets.

(q)

Geotechnical Instrumentation - Quality control shall consist of continuous
inspection during the installation of the geotechnical instrumentation. The
Inspector shall determine and document that the geotechnicalinstrumentation complies with the specifications. Detailed quality control
requirements are included in Construction Specification 401-Geotechnical
Instrumentation.

The skills, knowledge, abilities and experience needed by the Contractor's quality
control personnel to perform the quality control shall be as follows:(a)Must have the ability to maintain communications with the landowners, theContracting Officer and the Contractor.

(b)Knowledge of cut and grade staking and earthwork installations.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

94-9

(c)

Knowledge of soils, including foundation conditions, density andclassifications.

(d)Knowledge of sampling of soils and determination of density of in-placesoils.

(e)

When applicable, must have knowledge of acceptable moisture-density test
methods and the ability to satisfactorily perform the tests.

(f)

Have the ability to interpret survey notes and to prepare quantity
computations.

(g)Have the ability to maintain adequate files and records of construction
inspection work.

(h)Have the ability to interpret construction drawings and specifications.

(i)Must have knowledge of tests required for placement of acceptableconcrete and the procedures required for satisfactory placement.

(j)Must have knowledge and ability to perform concrete tests that include
slump tests, air contents and temperature measurements, and preparation ofcompressive strength cylinders.

(k)Must have knowledge of steel placement details and the ability to interpretsteel requirements from construction drawings.

(l)Must have knowledge of form construction and bracing for construction of
concrete structures.

(m)Must have knowledge of the United Soil Classification System and theability to interpret soil classification requirements from the construction
drawings.

(n)Must have knowledge of tests required for placement of acceptable RCC
and the procedures required for satisfactory placement.

(o)Concrete Laboratory Testing Technicians – Must have certification fromthe American Concrete Institute (ACI) for Concrete Laboratory Testing
Technician.

(10) Quality control personnel shall also be responsible for maintaining a record ofprogress with photographs. Construction activities shall be documented with 3
megapixels or greater digital photography in a JPEG file format. Photographs ofdaily construction work, problems encountered, and unique construction practices
shall be taken to insure full coverage of all work performed. The photographs shallbe numbered, date and time imprinted and indexed with documentation explaining
construction activities shown, and must be submitted with the request for final
payment.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

94-10

Construction Specification 95—Geotextile
1. Scope
This work consists of furnishing all material, equipment, and labor necessary for the installation of geotextiles.
2. Quality
Geotextiles shall conform to the requirements of Material Specification 592 and this specification.
3. Storage
Before use, the geotextile shall be stored in a clean, dry location out of direct sunlight, not subject to extremes of
either hot or cold temperatures, and with the manufacturer's protective cover undisturbed. Receiving, storage, andhandling at the job site shall be in accordance with the requirements listed in ASTM D 4873.
4. Surface preparation
The surface on which the geotextile is to be placed shall be graded to the neat lines and grades as shown on thedrawings. It shall be reasonably smooth and free of loose rock and clods, holes, depressions, projections, muddy
conditions, and standing or flowing water (unless otherwise specified in section 7 of this specification).
5. Placement
Before the geotextile is placed, the soil surface will be reviewed for quality assurance of the design and construction. The geotextile shall be placed on the approved prepared surface at the locations and in accordance with thedetails shown on the drawings and specified in section 7 of this specification. It shall be unrolled along the placement area and loosely laid, without stretching, in such a manner that it conforms to the surface irregularities whenmaterial or gabions are placed on or against it. The geotextile may be folded and overlapped to permit proper
placement in designated area(s).
Method 1—The geotextile shall be joined by machine sewing using thread material meeting the chemical requirements for the geotextile fibers or yarn. Thread shall be polypropylene, polyester, or KevlarTM aramid thread, unlessa specific thread type is specified. The thread shall be consist of two parallel stitched rows at a spacing of about 1
inch and shall not cross (except for any required re-stitching). The stitching shall be a lock-type stitch. Each row
of stitching shall be located a minimum of 2 inches from the geotextile edge. Unless otherwise specified, the seam
tensile strength as measured according to ASTM D4884 shall be a minimum of 90 percent of the geotextile tensile
strength in the weakest principal direction as measured according to ASTM D4632.
The geotextile shall be temporarily secured during placement of overlying material to prevent slippage, folding,wrinkling, or other displacement of the geotextile. Unless otherwise specified, methods of securing shall not cause
punctures, tears, or other openings to be formed in the geotextile.
Method 2—The geotextile shall be joined by overlapping a minimum of 18 inches (unless otherwise specified)and secured against the underlying foundation material. Securing pins, approved and provided by the geotextile
manufacturer, shall be placed along the edge of the panel or roll material to adequately hold it in place during
installation. Pins shall be steel or fiberglass formed as a U, L, or T shape or contain "ears" to prevent total penetration through the geotextile. Steel washers shall be provided on all but the U-shaped pins. The upstream or upslope
geotextile shall overlap the abutting downslope geotextile. At vertical laps, securing pins shall be inserted throughthe bottom layers along a line through approximately the mid-point of the overlap. At horizontal laps and acrossslope labs, securing shall be inserted through the bottom layer only. Securing pins shall be placed along a line about
2 inches in from the edge of the placed geotextile at intervals not to exceed 12 feet unless otherwise specified. Additional pins shall be installed as necessary and where appropriate to prevent any undue slippage or movement of
the geotextile. The use of securing pins will be held to the minimum necessary. Pins are to remain in place unlessotherwise specified.

(210–VI–NEH, January 2014)95–1

Should the geotextile be torn or punctured, or the overlaps or sewn joint disturbed, as evidenced by visible geotextile damage, subgrade pumping, intrusion, or grade distortion, the backfill around the damaged or displaced area
shall be removed and restored to the original approved condition. The repair shall consist of a patch of the same
type of geotextile being used and overlaying the existing geotextile. When the geotextile seams are required to besewn, the overlay patch shall extend a minimum of 1 foot beyond the edge of any damaged area and joined by sewing as required for the original geotextile except that the sewing shall be a minimum of 6 inches from the edge ofthe damaged geotextile. Geotextile panels joined by overlap shall have the patch extend a minimum of 2 feet fromthe edge of any damaged area.
Geotextile shall be placed in accordance with the following applicable specification according to the use indicatedin section 7:
Slope protection—The geotextile shall not be placed until it can be anchored and protected with the specified covering within 48 hours or protected from exposure to ultraviolet light. In no case shall material be
dropped on uncovered geotextile from a height of more than 3 feet.
Subsurface drains—The geotextile shall not be placed until drainfill or other material can be used to provide cover within the same working day. Drainfill material shall be placed in a manner that prevents damage
to the geotextile. In no case shall material be dropped on uncovered geotextile from a height of more than 5
feet.
Road stabilization—The geotextile shall be unrolled in a direction parallel to the roadway centerline in aloose manner permitting conformation to the surface irregularities when the roadway fill material is placedon its surface. In no case shall material be dropped on uncovered geotextile from a height of more than 5feet. Unless otherwise specified, the minimum overlap of geotextile panels joined without sewing shall be
24 inches. The geotextile may be temporarily secured with pins recommended or provided by the manufacturer, but they shall be removed before the permanent covering material is placed.

6. Measurement and payment
Method 1—For items of work for which specific unit prices are established in the contract, the quantity of geotextile for each type placed within the specified limits is determined to the nearest specified unit by measurements ofthe covered surfaces only, disregarding that required for anchorage, seams, and overlaps. Payment is made at thecontract unit price. Such payment constitutes full compensation for the completion of the work.
Method 2—For items of work for which specific unit prices are established in the contract, the quantity of geotextile for each type placed with the specified limits is determined to the nearest specified unit by computing the areaof the actual roll size or partial roll size installed. The computed area will include the amount required for overlap,
seams, and anchorage as specified. Payment is made at the contract unit price. Such payment constitutes full compensation for the completion of the work.
Method 3—For items of work for which specific lump sum prices are established in the contract, the quantity ofgeotextile is not measured for payment. Payment for geotextiles is made at the contract lump sum price and constitutes full compensation for the completion of the work.
All methods—The following provisions apply to all methods of measurement and payment. Compensation for any
item of work described in the contract, but not listed in the bid schedule, is included in the payment for the item ofwork to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in
section 7 of this specification.

7.

95–2

Items of work and construction details(210–VI–NEH, January 2014)

7. Items of Work and Construction Details
In Section 5, Placement, Method 2 shall apply.
In Section 6, Measurement and payment, Method 1 shall apply
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 36, Geotextile(1)

This item shall consist of furnishing and placing the geotextile for the rock riprap
located along the upstream wave protection, rock lined principal spillway outlet
channel, rock lined auxiliary spillway outlet channel, and the rock scour apron
upstream of the auxiliary spillway as shown on the drawings.

(2)

Placing the geotextile for the rock riprap includes all excavation, fill and backfill
required for keying geotextile into the slope, as shown on the drawings.

(3)

Geotextiles shall be non-woven Class I and meet Material Specification 592.

(4)

The geotextile shall have the following properties as indicated in Table 592-1 ofMaterial Specification 592:

(5)

Apparent Opening Size (AOS):

0.05 millimeters (maximum)

Porosity:

30% (minimum)

Mass-per-unit area:

12 oz/square yard (minimum)

The geotextile shall be placed and approved by the Engineer immediately prior to
the placement of the rock riprap.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

95-3

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

95-4

Construction Specification 99—Conduit Abandonment
1. Scope
The work consists of furnishing and installing cellular concrete to fill a conduit.
2. Material
Admixtures must conform to the requirements of Material Specification 533, Chemical Admixtures for Concrete.
If air-entraining cement is used, any additional air-entraining admixture must be of the same type as that in the cement.
Fly ash must conform to the requirements of Material Specification 532, Supplementary Cementitious Materials,
for the specified class.
Foaming agents must conform to the requirements of ASTM C869.
Portland cement must conform to the requirements of Material Specification 531, Portland Cement, for the specified type.
Water reducing and/or retarding admixtures must conform to the requirements of Material Specification 533,
Chemical Admixtures for Concrete.
Water used for the job mix must be clean and free from injurious amounts of oil, salt, acid, alkali, organic matteror other deleterious substances. Potable water may be used without testing. Nonpotable water must conform to therequirements of ASTM C1602.

3. Terminology
For the purpose of this specification the following definitions and terms apply:
bulkhead—A form, seal, or other apparatus installed to contain cellular concrete in the abandoned conduit.
cellular concrete—A lightweight concrete having a homogeneous void or cell structure made with a foaming
agent, which may contain typical concrete admixtures or supplementary cementitious materials, such as fly ash;synonymous with grout.
cold weather—The condition that exists when the average daily ambient temperature is less than 40 degrees Fahrenheit for 3 consecutive days and the temperature is less than 50 degrees Fahrenheit for more than one-half of any
24-hour period.
engineer—The person responsible to the contracting officer or owner for verifying the technical adequacy of thework.
gauge saver—A device installed between a grout line and a pressure gauge to prevent grout from entering thepressure gauge.
grout line—Equipment through which the cellular concrete is pumped to the point of deployment.
hot weather—Any combination of high temperatures, low relative humidity, high winds, and solar radiation that
impairs the quality of freshly mixed or hardened concrete or grout by accelerating the rate of moisture loss andrate of cement hydration, or otherwise causes detrimental results.
inline rotor-stator mixer—A type of high-shear mixer that can be installed in a grout line and used to combine
foam or a foaming additive with neat-cement grout.

(210–VI–NEH, February 2015)99–1

job mix—A cellular concrete mix that has been designed to comply with this specification and has the engineer’s
concurrence for its specified use.
neat-cement grout—A mixture of Portland cement and water that may contain admixtures or a supplementary
cementitious material such as fly ash.
prefoamed grout—A mixture of Portland cement, water, and a foaming agent that may contain additives or a
supplementary cementitious material such as fly ash.
pumped cellular concrete—Cellular concrete sampled at or beyond the point of grout line discharge.
prepumped cellular concrete—Cellular concrete sampled at the mixer before it is pumped through the groutline.
slick line—Tubing that is used to deliver cellular concrete to a point within the abandoned conduit.

4. Submittals
At least 14 days before filling the conduit, furnish the engineer a written plan for the operation. Include evidence
satisfactory to the engineer that the cellular concrete will be installed by a contractor having completed a minimumof 10 cellular concrete installations that are similar in nature to that specified.
Include a cellular concrete mix design report with a statement of all materials to be incorporated into the mix, themix proportions, and evidence that the materials and the mix meet specification requirements. Provide results of
ASTM C232 for bleeding, ASTM C495 for compressive strength, and wet density as specified in section 9. Include
a detailed description of the mechanisms that will be used for producing and conveying the job mix into the conduit. Address the installation of bulkheads, vents, grout nipples, slick lines, and any other materials and equipment
necessary to maintain pressure and flow of the mix. Once approved by the engineer, the statement of materials andproportions will constitute the job mix. Any change to the job mix must be approved by the engineer.
Include any materials and methods proposed to seal holes and separated joints. A description of bonding surface
preparation and adhesives must be included.
When applicable, include a plan for confined space entry or permit-required confined space entry, as applicable, as
defined in OSHA 1910.
After approval of the plan, it must not change without prior written notice and the engineer’s concurrence with thechange.
During the grouting operation, the contractor must furnish the engineer a record of the mix ingredients and proportions. Any materials batched offsite shall must include the time of batching and the time the load was discharged.
Report the results of onsite testing to determine that cellular concrete density and temperature comply with specification requirements at the time of determination.
Submit a final written report to the engineer including all test results. Include location, date, and time of sampling
and testing with all density values. Described corrective actions including, but not limited to, mix proportion adjustments, adjustments in foam generation, and pumping pressure adjustments. Include the results of oven-dry
density and 28-day compressive strength tests made and reported in accordance with ASTM C495.

5. Design of job mix
Proportion the mix according to recommendations of the manufacturer of the foaming admixture.
Use Portland cement and a pozzolan such as fly ash with the amount of pozzolan ranging from 25 to 50 percent of
the volume of cementitious materials.
Control the water/cementitious materials ratio so that bleeding does not occur.
99–2(210–VI–NEH, February 2015)

The job mix must have a wet density ranging from 40 to 70 pounds per cubic foot.
The job mix 28-day compressive strength must equal or exceed 200 pounds per square inch.

6. Preparing the conduit
Remove all sediment and debris from the conduit, and flush it with water prior to installing the carrier pipe. The
quality of the water must be such that no residue remains in the conduit after flushing. Remove all standing waterfrom within the conduit prior to filling with cellular concrete.
Holes in the conduit or separated joints must be sealed unless otherwise specified in section 11.

7. Mixers and mixing
Cellular concrete production must comply with requirements set forth by the manufacturer of the foaming admixture and this specification.
Neat-cement grout to be used in the production of the job mix may be batched and mixed on site or batched andmixed elsewhere and transported to the site. Use a high-speed paddle or high-shear mixer to mix the foaming agent
or prefoamed grout with the neat-cement grout. A concrete drum mixer must not be used for adding foam or afoaming agent to the job mix.
If an inline rotor-stator mixer is used for incorporating prefoamed grout into the neat-cement grout, install a pointof discharge with a valve just beyond the inline mixer for the purpose of sampling and measuring the prepumped
wet density of the job mix.
The prepumped wet density of the job mix must not vary more than 2 pounds per cubic foot throughout the grouting operation.

8. Grouting
Convey and pump the job mix into the conduit within 90 minutes after the introduction of the cement to the mix.
The mix shall must be conveyed and pumped as rapidly as practical at pressures at or below the specified maximum.
Pump the job mix with progressive cavity pumps, positive displacement pumps, eccentric screw pumps, eccentric
cavity pumps, peristaltic pumps, or other nonpulsing pumps. Piston pumps and other pumps which subject the mix
to pulsing pressures shall must not be used.
The pumped wet density must not vary more than 5 pounds per cubic foot and must be maintained, throughout thegrouting operation, within 5 pounds per cubic foot of the prepumped density.
Pumping—Pumping pressure must be controlled and provisions made to guard against sudden failure of pumplines, and bulkheads, or and pressure-induced separation of the conduit.
With both vents open, pump the job mix into a grout nipple in the downstream bulkhead. Close the downstream
vent when cellular concrete begins flowing from the vent.
Cellular concrete may be conveyed the entire length of the pipe from the bulkhead provided the whole conduit isfilled and the pressure at the point of discharge does not exceed the maximum pressure specified in section 11.
Discharge the job mix at multiple points in the abandoned conduit if the job mix cannot be deployed throughout
the conduit without exceeding the specified maximum pressure or damaging the bulkheads or conduit. Whendischarging at multiple points is necessary, begin pumping into the shortest slick line and proceeding to the next
shortest slick line, repeating the process to completely fill the abandoned conduit.
Hold period—With all vents, slick lines, and all unconnected grout nipples closed, maintain 2 to 4 pounds per
square inch pressure on the closed system for a minimum of 5 minutes. After the hold period, close the connected(210–VI–NEH, February 2015)99–3

grout nipple and disconnect the grout line. Leave the bulkheads in place for a minimum period of 24 hours after thehold period or until the job mix is set as determined.
Determining if the job mix has set—Fill a container having a minimum volume of 0.2 cubic foot with cellularconcrete discharged from the grout line. Seal the container to prevent drying or evaporation and store it away fromsunlight. The mix will have set when it will not flow from the open container.
Cold weather—The job mix must not be conveyed and pumped into the conduit during cold weather unless it isinsulated or otherwise prevented from freezing for a period of 24 hours after setting. The temperature of the mix
must equal or exceed 40 degrees Fahrenheit at the time of pumping into the conduit.
Hot weather—In hot weather or under conditions contributing to quick stiffening of the mix, the time between
the introduction of the water into the mix and pumping must not exceed 45 minutes. The engineer may allow a longer time, provided the setting time of the mix is increased a corresponding amount by the addition of an approved
set-retarding admixture. The temperature of mix must not exceed 90 degrees Fahrenheit at the time of pumping
into the annular space.

9. Monitoring and testing
Monitor wet density of prepumped and pumped cellular concrete throughout the grouting operation and makeadjustments to comply with this specification.
Use a cylindrical container of known weight and volume to monitor the wet density of prepumped and pumped
cellular concrete. The container must be at least 0.2 cubic foot in volume and made of nonabsorbent material. Tap
the sides of the container by hand or rubber mallet while collecting a representative sample of cellular concrete.
Overfill the container and screed excess concrete with a sawing motion using a glass, acrylic, or metal strike-off
plate. Clean excess concrete from the container exterior and weigh the sample with a scale accurate to 0.1 pounds.
Compute and record the wet density to the nearest 0.5 pound per cubic foot.
Test prepumped wet density at the beginning of cellular concrete production and test pumped wet density prior toconnecting the grout line to the grout nipple entering the conduit. Test prepumped and pumped wet density at least
every 30 minutes during the grouting operation, when there are visually noticeable changes in the cellular concrete,
and after corrective actions to adjust the density.
Test the mix for bleeding according to ASTM C232.
Prepare strength test specimens according to ASTM C495. Obtain six initial strength specimens from the grout linedischarge immediately prior to making the first grout nipple connection. Obtain six final strength test specimens
immediately prior to making the last grout nipple connection. Test specimens for 28-day compressive strength andoven-dry density according to ASTM C495.

10. Measurement and payment
Payment for conduit abandonment will be made at the contract lump sum price and will constitute full compensation for all labor, equipment, materials, and all other items necessary and incidental to the completion of the work.
Compensation for any item of work described in the contract, but not listed in the bid schedule, is included in thepayment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 11 of this specification.

11. Items of work and construction details

99–4(210–VI–NEH, February 2015)

11.

Items of Work and Construction Details
In Section 8, Grouting, the maximum grout pressure shall not exceed 4 psi.
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 37, Conduit Abandonment(1)This item consists of filling the existing principal spillway conduit designated to beabandoned with the job mix as specified in Section 5.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

99-5

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

99-6

Construction Specification 401 – Geotechnical Instrumentation andMonitoring
1.
Geotechnical Instrumentation Work
This specification covers geotechnical instrumentation for the Plum Creek No. 21 Dam Rehabilitation project asshown on the Drawings. Geotechnical instrumentation is required for future monitoring of dam performance andconfirmation of design assumptions with respect to potential ground movement and piezometric levels. The
geotechnical instrumentation required to monitor ground and structure movements, reservoir levels, andpiezometric levels include, but are not limited to the following:a. Drilling boreholes.
b. Installing instrumentation in boreholes (piezometers).
c. Decommissioning existing piezometers to be abandoned.
d. Installing surface survey monitoring points.
e. Installing reservoir staff gauges.
All geotechnical instrumentation work shall be performed in accordance with all local, state, and federal safety
regulations and permits required for the project, including Engineering Regulation (ER) 1110-1-1807: Drilling inEarth Embankment Dams and Levees.
2.
References
The publications listed below form a part of this specification to the extent referenced. The publications arereferred to within the text by the basic designation only.
ASTM International (ASTM)
ASTM C150/150M
ASTM D1586
ASTM D1587
ASTM D2113
ASTM D2487
ASTM D2488
ASTM D3550
ASTM D4220
ASTM D5079
ASTM D5434
ASTM D6032(2020) Standard Specification for Portland Cement(2019) Penetration Test and Split-Barrel Sampling of Soils(2015) Thin-Walled Tube Sampling of Soils for Geotechnical Purposes(2014) Rock Core Drilling and Sampling of Rock for Site Investigation(2020) Classification of Soils for Engineering Purposes (Unified Soil
Classification System)(2018) Description and Identification of Soils (Visual-Manual Procedure)(2017) Thick Wall, Ring-Lined, Split Barrel, Drive Sampling of Soils(2014) Preserving and Transporting Soil Samples(2017) Preserving and Transporting Rock Core Samples(2012) Field Logging of Subsurface Explorations of Soil and Rock(2017) Determining Rock Quality Designation (RQD) or Rock Core

Natural Resources Conservation Service (NRCS)
National Engineering Handbook, Part 631, Chapter 2, Engineering Geologic Investigations
National Engineering Handbook, Part 631, Chapter 3, Characterization of Earth
National Engineering Handbook, Part 631, Chapter 4, Engineering Classification of Rock Materials
National Engineering Handbook, Part 631, Chapter 5, Engineering Geology Logging, Sampling, andTestingNational Engineering Manual, Title 210
Construction Specification 8
Mobilization and Demobilization
Construction Specification 21 Excavation
Construction Specification 23 Earthfill
Construction Specification 26 Topsoiling

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-1

Construction Specification 45
Construction Specification 94
Material Specification 521
Material Specification 531
Material Specification 532
Material Specification 547

Plastic Pipe
Contractor Quality Control
Aggregate for Drainfill and Filters
Portland Cement
Supplementary Cementitious Materials
Plastic Pipe

Texas Department of Licensing And Regulations (TDLR)
Well Construction and Plugging Specifications https://www.tdlr.texas.gov/wwd/wwdspecs.htm
United Stated Army Corps of Engineers (USACE)
Engineering Regulation (ER) 1110-1-1807: Drilling in Earth Embankment Dams and Levees.
3.

Definitions
a. Piezometer (PZ):
A specially constructed observation well constructed in a borehole using a blank pipe section near the
ground surface and a specially slotted pipe section at the bottom of the well. The slotted section ofpipe can be adjusted to measure a groundwater level in a specific zone, or the slots can extend overlarge intervals to measure an average overall groundwater level in the vicinity of the well.
b. Well Sounder (WS):A well sounder measures the water level in a well or standpipe by sensing the level of the water whena special electrical contact tip touches the water surface. The tip is attached to the end of a speciallymarked graduated cable which enables the reader to measure the water depth.
c. Piezometer Decommission:
Decommissioning an existing piezometer by plugging in accordance with all applicable Federal,
State, and local regulations.
d. Reservoir Staff Gage (RSG):
A staff gauge is a permanently mounted measurement scale, similar to a tape measure or a ruler, used
to provide a visual indication of reservoir depth and/or water surface elevation.
e. Survey Monitoring Point (SMP):
Inscribed marking or approved surveyor's nail or rebar driven flush with surface or brass cap installed
into new or existing concrete, masonry, roller-compacted concrete (RCC), asphalt, or soil at
predetermined locations to measure vertical (elevation) and horizontal (coordinates) locations ofground surface or structural element.

4.
Submittals
Qualifications
The Contractor shall submit the name of the instrumentation firm and written documentation summarizing thequalifications and references for three (3) similar projects to the Engineer at least 30 days prior to the start of workfor review and approval. Provide resumes detailing the experience of all instrumentation personnel.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-2

Instrumentation Work Plan
The Contractor shall submit a detailed Instrumentation Work Plan to the Engineer for review and approval at least
30 days prior to the start of work describing the proposed equipment and installation methods to be used including
the following:a. List of all instruments to be installed.
b. Manufacturer’s data sheets for all materials to be included in instrument types to be installed as listedin PRODUCT DATA.
c. Proposed drilling equipment and installation techniques prior to commencing any drilling.
d. Details for identifying, protecting, and maintaining utilities in working service and existing structures.
Product Dataa. Portland Cementb. Well Casing and Slotted Screenc. Filter Sand
d. Bentonite
e. Survey Monuments
f. Grout Mix Design
g. Protective enclosures for piezometers
h. Well Sounderi. Reservoir Staff Gauge
As-Built Submittals
Within a maximum twenty-five days following the installation of the instruments, the Contractor shall submit to
the Engineer for review As-Built Drawings showing the exact installed location (a plan view of the instrument
locations), the instrument identification number (ID), the instrument type, and the installation date and time.
Include details of installed instruments, instrument calibrations, accessories, and protective measures including all
dimensions and materials used. Amend project drawings during construction to reflect changes in instrumentation
installations. A pre-installation form and an installation form are required for each instrument.
All records shall be in U.S. Customary Units; for example: feet, inches, pounds, pounds per square inch, anddegrees Fahrenheit.
The Pre-installation form shall contain the following:a. Instrument type and model number;b. Instrument ID;
c. Verification of no apparent damage in shipping; andd. Signature of the person performing the pre-installation testing.
The Installation form shall include:a. Instrument ID;
b. Date and time of installation;c. As-built instrument locations indicating accurate elevations (using a licensed Texas surveyor) and asbuilt geometry of each instrument following installation.
d. Electronic photographs of each instrument installation shall be provided.
e. Conditions encountered during the installation; andf. Signature of person in charge of installation and testing.
A geotechnical Boring Log of each borehole drilled for instrument installation, as described further in Section 14,
FIELD QUALITY CONTROL.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-3

Construction details for instrumentation installation / decommission as follows:a. As-Built Piezometer Construction Detailb. As-Built Piezometer Decommission Detailc. As-Built SMP Construction Detaild. As-Built RSG Construction Detaile. As-Built tabulated survey data for all instruments
f. TDLR/TCEQ Well Reports
5.
Quality Assurance
Submit the name of the Instrumentation Firm and Drilling Firm and written documentation summarizing their
qualifications to the Engineer for review and approval at least 30 days prior to the start of work in accordancewith Section 4, SUBMITTALS. The submittals shall, where applicable, identify individuals who will be working
on this contract and their relevant experience. No changes shall be made in approved personnel without priorapproval of the Contracting Officer.
Qualifications of Instrumentation Firm and Personnel
Submit Instrumentation Firm qualifications and experience records for approval. Experience records shallidentify all the individuals responsible for the instrumentation and shall include a listing of at least three (3)projects of similar scope performed within the specified period along with references and contact information.
Installer qualifications must be approved prior to the installation of any instrumentation. The instrumentation
shall be installed by a firm which is regularly engaged in the installation and monitoring of such devices and has
at least 10 years' experience in the installation of similar instrumentation.
The Instrumentation Firm’s personnel shall include a Superintendent who will be in responsible charge during thegeotechnical instrumentation program. The Superintendent shall have prior field experience in installation,
monitoring, and abandonment of piezometers dams, and shall have supervised instrumentation programs ofsimilar magnitude in similar subsurface conditions on existing earth embankment dams. The Superintendent shallbe a Professional Geologist (PG) or Professional Engineer (PE) licensed to practice in the State of Texas. The
Superintendent shall:a. Be on site and supervise all instrument installations, and pre-installation and post-installation acceptancetests as required.
b. Supervise data collection, reduction, plotting, and reporting, except for survey data.
c. Communicate with the Engineer if conditions encountered require modification to the instrumentation
installation plan.
A Registered Professional Land Surveyor (RPLS) in the State of Texas shall be in responsible charge of theinstallation of SMPs and surveying all geotechnical instrumentation. Both the Professional Surveyor and theField Survey Party Chief shall have experience in the measurements of the types and accuracies specified herein.
Drilling Firm Qualifications
Submit Drilling Firm qualifications and experience records for approval. Experience records shall identify all theindividuals responsible for the drilling activities and shall include a listing of at least three (3) projects of similar
scope performed within the specified period along with references and contact information. The project Driller
shall be a licensed Well Driller with the Texas Department of Licensing and Regulation (TDLR), and shall be onsite full time to supervise drilling, installation, and abandonment of piezometers.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-4

6.
Delivery, Storage, and Handling
Materials shall be protected, transported, and stored in a manner to prevent contamination or damage to any
components. Materials shall be suitably wrapped, packaged, or covered at the factory or shop to prevent being
affected by dirt, water, oil, grease, and rust. Protect materials against abrasion or damage during shipment andhandling. Place materials stored at the site above ground on a well-supported platform and covered with plastic orother approved material. Materials shall be protected from adjacent construction operations. Inspect materials fordamage and reject and remove from the site materials which are damaged.
7.
Materials
GeneralMaterials shall conform to the requirements indicated on the Drawings or referred to herein, and, when notcovered thereby, materials and equipment of commercial grade quality suited to the intended use and as approvedby the Engineer shall be furnished.
Centralizers
Centralizers for piezometer casing and slotted sections shall be fabricated from plastic, steel, or other material
approved by the Engineer which is nondetrimental to the installation. Wood shall not be used. The centralizer
shall be able to support the piezometer casing in the drill hole so a minimum of 2 inch of backfill cover isprovided. Centralizers and spacers shall permit backfill and grout materials to freely flow into the annular spaceof the drillhole. Centralizers will be placed one foot above and one foot below the screen and at approximately
40-foot intervals along the casing of monitoring wells, except that wells installed using hollow-stem auger
methods do not require centralizers.
Grout
Grout shall be a neat cement mixture of Portland cement, bentonite, and water. The grout mixture shall containten percent bentonite by weight and sufficient water to produce a pourable consistency. The grout mixture may bevaried with the Engineer’s approval.
Materials for grout shall be in accordance with the following requirements:
a. Cement shall meet the requirements of ASTM C150 for Type II Portland cement. Only cement
furnished in sacks shall be used.
b. Water shall be free from sulfates and organic or other particulate matter, and meet the requirements
for water for concrete as specified in Construction Specification 31, Concrete for Major Structures.
c. Bentonite shall be powdered premium commercial grade. Bentonite shall be hydrated with water prior
to mixing it with cement. The hydrated bentonite shall be batched as a slurry in such proportions thatapproximately ten percent bentonite powder, by dry weight, is used for each bag of cement, or asotherwise required by the Engineer.
Piezometer Surface Completion and Protection
Surface completion shall consist of a stick-up type enclosure with lockable end cap compatible with the enclosure
diameter. The enclosure shall be five- to eight-inch diameter steel pipe with a minimum 0.250-inch wall
thickness. The pipe shall extend approximately 2.5 feet above the ground surface. Compatible padlocks shall befurnished for each lockable enclosure. All padlocks shall be brass construction and keyed the same, and keys
shall be provided to the Contracting Officer at the end of the construction contract.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-5

The surface completion shall be properly labeled with an identification plate consisting of durable, weatherproof,
rustproof material and permanently secured to the surface completion where it is readily visible. It shall bepermanently marked to show:
a.
b.
c.
d.
e.
f.
g.

Company name and certification number of driller who installed the well;
Date well was completed;
Total depth (feet);
Casing depth (feet);
Screened interval;
Piezometer identification number; andStatic water level.

In areas accessible to vehicular traffic, the Contractor shall provide three protective bollards around the perimeterof the stick-up enclosure. The bollards shall be minimum 4-inch diameter steel pipe filled with concrete, andhave a minimum 3-foot stick up and 1.5-foot embedment. The embedded zones shall be concreted in-place.
The Contractor shall provide temporary protective barriers around piezometers in construction areas, suitable forprotecting from damage due to construction activities.
PVC Well Casing
PVC well casing shall consist of watertight flush-joint threaded Schedule 80 PVC manufactured by Boart
Longyear Company or equal. Diameter is indicated in the Drawings.
PVC Slotted Screen
PVC slotted screen shall consist of flush-joint threaded Schedule 80 PVC manufactured by Boart Longyear
Company or equal. Screen shall be machine-slotted with maximum 0.010-inch (0.253 mm) aperture slots.
Diameter is indicated in the Drawings.
Filter pack
Filter pack materials shall consist of clean, washed silica sand. Silica sand shall be 10/20 mixture or othergradation which is compatible with the surrounding soil types and slot size of the PVC screen and allows freegroundwater flow into the screened casing.
Bentonite Seal
Bentonite seal shall consist of 3/8- to 1/2-inch uncoated bentonite pellets hydrated in the borehole. Alternative
bentonite products may be submitted to the Engineer for review and approval.
Epoxy / Grout for SMPs
If epoxy or grout is required to install SMPs on structures, submit manufacturer data to the Engineer for review
and approval. Epoxy or grout for SMPs shall be a non-shrink, volumetrically-stable, structural-grade productmanufactured for the intended purpose.
Reservoir Staff Gauge (Metal)
The RSG shall be of corrosion-resistant construction as indicated in the Drawings. The staff gauge will have alight-colored background with high-visibility contrasting marking graduated by every 0.2 feet as indicated in the
Drawings. Alternative materials are subject to review and approval by the Engineer. Markings shall extend overthe full height of the gauge, beginning at the first whole-foot increment above the principal spillway conduit
crown (approximately El. 497) and extending to near the crest of the principal spillway inlet riser structure(approximately El. 505.4 feet). The staff gauge shall include a mounting kit as recommend by the gauge
manufacturer.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-6

Reservoir Staff Gauge (Concrete)
The RSG shall be of reinforced-concrete construction as indicated in the Drawings. The staff gauge will have auniform surface with high-visibility imprinted elevation labels and graduations every 0.5 feet as indicated in the
Drawings. Alternative materials are subject to review and approval by the Engineer. Markings shall extend overthe full height of the gauge, beginning and ending at the elevations indicated on the drawings.
8.
Equipment
Where model numbers are given in this section, they shall be understood to represent models selected on the basisof past factory specifications and project experience demonstrating that the equipment, including stipulations
herein, will meet the performance objectives of this Work. The Contractor shall verify with any selected
manufacturer that the designated model, or the updated version, or allowed equal, meets the design performanceoutlined by these drawings and specifications. Detailed working drawings and updated technical specifications
for the project shall be submitted to the Engineer for approval, prior to starting installation. All
equipment/materials listed in the Drawings and Specifications must be approved by the Engineer.
The Contractor shall furnish all installation tools, materials, and miscellaneous instrumentation components
required to accomplish the work except where noted within these Specifications.
Spare parts/equipment shall be available on site to maintain instrumentation monitoring in satisfactorily operating
condition at all times during execution of the work.
Drilling Equipment
Provide drilling equipment suitable for advancing the drill tools to the depths and at the alignment. Drill bit(s) for
boreholes shall be capable of advancing through subsurface conditions which may be encountered.
Grouting Equipment
Grouting equipment shall consist of grout pumps, water pumps, hoses, mixing tanks, and tremie pipe. Grouting
equipment shall be capable of continuous mechanical mixing that will produce uniform and thoroughly mixed
grout which is free of lumps and undispersed cement. The grouting equipment shall be capable of delivering the
grout to the bottom of the borehole via tremie methods at low flow rates and in a controlled manner. The
diameter of the tremie pipe shall be adequate to reach the bottom of the borehole and fully grout the annular spacearound the casing.
Well SounderWell sounder shall be electrical type contact well sounder as manufactured by Solinst, Toronto, Canada, or equal.
The well sounder cable shall be a minimum of 100 ft long and shall be graduated in 0.1-foot increments.
9.
Execution
GeneralAll work shall be performed in accordance with local, state, and federal safety regulations and any other permits
required for this project.
The Contractor shall provide equipment and materials necessary for instrument installation except whereindicated. All instrumentation shall be installed in accordance with the Drawings in a neat workmanlike mannerand according to the manufacturer’s recommendations.
The Contractor shall be responsible for providing adequate security and protection of the instrumentation during
the entire period of construction, including protection from vandalism.
The Contractor shall notify the Engineer 5 working days in advance of the installation of any instrument.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-7

The Contractor shall locate conduits and underground utilities in all areas where borings are to be drilled andinstruments installed. Instrument locations shall be modified, as approved by the Engineer, to avoid interferencewith the existing conduits and utilities. Repair damage to existing utilities resulting from instrument installations
at no additional cost to the Owner.
Immediately following installation, the Contractor shall survey and provide horizontal coordinates and verticalelevations of the top of all instruments. The Contractor shall employ a Land Surveyor, licensed in the State ofTexas, for this purpose.
10.
Installation of Piezometers
Drilling
Boreholes shall be drilled at the locations shown and to the depths and diameters indicated on the Drawings andTable 401-2. The locations of the holes may be changed only as approved by the Contracting Officer.
Boreholes drilled from the ground surface shall be subject to permitting. The Contractor shall obtain necessary
permits for each such instrument and conform to the permit requirements during drilling and installation. Disposalof cuttings and drilling fluids according to local, state, and federal regulations shall be the Contractor’s
responsibility.
Drilling for boreholes for instrumentation shall be within 2 degrees of vertical. The Contractor shall determine
the drilling method to be used, except that air rotary and mud rotary drilling methods shall NOT be permitted due
to risk of hydrofracture in the dam embankment. Care shall be taken while drilling to avoid damage of any kind
to existing structures. Damages of any nature will be evaluated by the Engineer and repairs or replacements shallbe made as required by the Contractor at the Contractor’s expense. Borehole diameter shall be no less than 6
inches.
The Contractor shall use metal pans or tanks to contain any waste drilling fluids. The Contractor shall not permit
oil or grease waste on the fill. The Contractor shall dispose of drilling fluids, oil and grease waste, and all otherwaste in accordance with applicable regulatory requirements.
Geologic Sampling and Logging
Boreholes drilled for instrument installation shall be logged by the instrumentation Superintendent in accordancewith NRCS procedures and supplemented by ASTM procedures (refer to Section 2 REFERENCES). Field boring
log forms will be completed by the Superintendent, and will contain information as prescribed in Section 14
FIELD QUALITY CONTROL, BORING LOGS.
Soil samples shall be collected at no greater than 2.5-foot intervals in the upper 20 feet, and at 5-foot intervals
thereafter. Sampling methods may include continuous coring, Standard Penetration Test (SPT) split-spoon
sampling, and/or Shelby tubes, and may be supplemented with grab samples from auger cuttings as appropriate,and shall be conducted in accordance with applicable ASTM standards.
Split-spoon and grab samples should be stored in resealable plastic bags or glass jars. Core boxes should be used
to store continuous core samples. The samples should be labeled with indelible ink indicating boring or wellnumber and sample interval.
The Contractor shall store soil/rock samples in a climate-controlled facility located within 100 miles of the projectsite throughout the duration of construction. Samples shall be made readily available for inspection by the Owner
and possible laboratory testing. Samples will be retained by the Contractor for a period of 6 months following
completion of the construction contract, or be shipped by the Contractor to the NRCS-Lincoln, Nebraskamaterials testing laboratory if requested by the Contracting Officer.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-8

Preparation
The final dimensions for each piezometer, including the total depth, screened interval, screen type, filter pack, andslot size may need to be adjusted based upon hydrologic and geologic conditions encountered and the judgementof the instrumentation Superintendent. The Engineer shall be notified immediately when significant deviationfrom planned installation is recommended by the Superintendent.
Verify that all drill holes have been drilled to the correct size, depth, and orientation prior to installation of
instruments. Prior to installing the instrument through drill casing or augers, all materials adhering to the inside of
the casing or augers, and all cuttings, shall be removed thoroughly.
Installation and Backfilling
Set the bottom of the slotted pipe to the elevation indicated. Flush drilling fluid, if used, out of the hole throughthe inside of the slotted pipe and casing.
Place sand filter pack material in the hole to surround the pipe up to the elevation of the seal as shown in the
Drawings. Seal the annulus around the riser pipe with a plug of hydrated bentonite pellets as shown on the
Drawings. Frequent sounding with a weighted tape should be performed to confirm filter/seal depth and confirm
no bridging. Following adequate hydration time of the bentonite seal, backfill the remainder of the hole withapproved cement-bentonite grout. The theoretical volume of grout should be calculated for each borehole prior tocommencement of grouting, and actual volume of grout introduced to the borehole should be recorded. Groutingof the annular space around the standpipes above the bentonite seal shall be conducted through tremie pipes.
Drill casing shall be withdrawn as the backfill materials are placed. Whenever withdrawing drill casing or augers
during instrument installation in a borehole, care shall be taken to minimize the length of unsupported borehole
and the rate of casing or auger withdrawal. Collapse of the borehole shall not be allowed to occur; the borehole
shall be over-drilled in the event that any collapse is suspected. Backfill materials shall not be allowed to build
up inside the casing or auger such that the instrument is lifted as the casing or auger is withdrawn. The casing or
auger shall be withdrawn without rotation. The casing or auger may be omitted, if allowed by the Engineer, only
where it can be confirmed that instrument installation without he casing or auger will not cause collapse of theborehole or in any way adversely affect instrument installation. If casing or augers are omitted, or the Engineer
allows withdrawal of casing or augers prior to instrument installation, the following requirements shall apply: theinstrument shall be installed in the borehole in a continuous operation, starting when instrumentation materials are
first placed in the borehole, and shall not be interrupted prior to complete backfilling of the borehole to the groundsurface; partially completed instrument installations shall not be left in unsupported boreholes overnight or longer
without prior written concurrent from the Contracting Officer.
Inspect the grout level 24 hours after initial grouting to determine if curing is occurring properly and if grout
levels have dropped. Top-off grout as needed and re-check the fluid level after another 24 hours to determine if
additional top-off grouting is required.
Surface Completion and Protection
Following adequate grout curing and confirmation of no further grout settlement, the Contractor shall installsurface completions as shown on the Drawings and described in Section 7, MATERIALS (PIEZOMETER
SURFACE COMPLETION AND PROTECTION).
Well Development
The development method selected will depend upon the location, purpose, condition of the well, strata
encountered, type of filter pack, screen size, etc. Acceptable development methods may include pumping or
bailing. Alternate methods shall be subject to review and approval by the Engineer. The development techniques

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-9

used shall be documented. This documentation shall include a log of the time intervals of the various development
processes used.
Well development shall not be initiated within 24 hours of the installation of the final stage of grout. Only potablewater shall be used in monitoring well development.
Development shall continue until clear, sediment-free water return is consistently produced. If possible, the wellshould be developed until the turbidity is <15 Nephelometer Turbidity Units (NTUs). Development parametermeasurements shall be documented. Measurements to be taken during development may include specificconductance, pH, temperature, turbidity, and yield. Any sediment that has accumulated in the sump during
development shall be removed.
Proper well development may require the use of additives such as sodium phosphate which expedite thebreakdown of drilling fluids that are trapped in the formation.
Data Collection and Records
Submit driller logs and records as specified in Section 14 FIELD QUALITY CONTROL, BORING LOGS. The
presence of a Government inspector or the keeping of separate drilling records by the Contracting Officer shallnot relieve the Contractor of the responsibility for the work specified in this paragraph.
All depths and elevations of the piezometer materials (screened interval, seal, etc.) shall be recorded as specified
in Section 14 QUALITY CONTROL. Calculated theoretical grout volume and the actual introduced volume of
cement-bentonite grout shall be recorded on the diagrams.
Payment will not be made for any work for which the required records have not been furnished by the Contractor.
Data collection, reading frequency, and reporting shall be done in accordance with Table 401-1.
11.
Decommission of Piezometers
GeneralExisting piezometers which interfere with the proposed structures as indicated on the Drawings and Table 401-3
shall be decommissioned as specified. The decommission method shall be overdrilling and/or grouting at theContracting Officer’s direction. All PVC casing, screen, and filter pack shall remain in the piezometer, unlessdirected otherwise by the Contracting Officer. Protective surface casings and/or manholes shall be removed.
Prior to grouting, each piezometer shall be checked for blockage or caving. Blocked or caved holes shall becleared to the full depth of the original drilled hole, or to the depth of previous grouting as approved by theEngineer.
Grout shall be tremied through a pipe from the bottom of the hole upward so that the hole is completely backfilledwith grout, unless specified otherwise herein.
The Contractor shall at all times provide for disposal of all wash and waste water, cement bags and other debris,in accordance with all state and local regulations, and shall remove all waste grout caused by its operations. If
approved by the Contracting Office, waste grout may be disposed at designated on-site waste areas where
provided that a minimum 12-inch topsoil cover is provided over the waste grout.
Grouting
Piezometers shall be filled with a neat, non-shrinking cement grout and bentonite mixture. The cement grout shallconsist of a mixture of neat cement (Portland Type II) and 5 to 6 gallons of potable water per 94-pound sack ofneat cement. Grout materials shall be weighed and metered by the amount of water used (water-to-cement ratio =NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-10a slurry weight of approximately 16 pounds per gallon). The consistency of the grout shall be sufficient to flow
through the well screen and into the filter pack.
The piezometer will be filled with grout placed via tremie methods under gravity pressure only. The fluid grout
level shall be checked a minimum period of 24 hours after grouting procedures have ceased, and topped off asrequired to maintain grout level at proposed elevation.
After each well has been grouted, the top 2 feet of each well shall be over excavated and back-filled to surface
with compacted embankment fill. Topsoil will be added in areas where no further fill and/or structures areplanned.
Over Drilling
If directed by the Contracting Officer, the piezometers shall be destroyed by over drilling and grouting (with atremie pipe) the entire length of each well; thereby, sealing the subsurface (first groundwater zone) from surface
water infiltration.
The over drilling and grouting shall follow the following processes:a. Hollow stem auger (HSA) over drilling, using 8-inch drill bits and auger or larger, shall be used to
conduct the over drilling of the entire depth of each well location.
b. After the over drilling is completed each PVC well casing (blank and screen) shall be removed (pulledout) from the original borehole; thereby, leaving an open borehole from surface to total depth.
c. Each borehole shall be filled with cement grout from total depth to 3 feet below ground surface.
d. Grouting shall follow procedures listed in GROUTING.
Data Collection and Records
Prior to piezometer decommission, final groundwater levels shall be collected in each of the piezometers andrecorded. An estimate of the reservoir elevation at the time of data collection shall also be obtained.
The date and time of decommission, decommission method employed, field observations, and other pertinent
information required by TCEQ/TDLR shall be recorded and submitted for review. Data shall be submitted within
48 hours of decommission.
12.
Installation of SMPs
GeneralThe SMPs shall be installed on structures at the locations as indicated on the Drawings and Table 401-4. Locateand construct monitoring points in a manner that will not create a hazard to pedestrians and vehicles. Maintain
access to monitoring points.
Placing
The SMPs shall be monitored by the Contractor. The SMPs shall be installed and surveyed as early as feasible(either as part of structure construction or shortly thereafter) to establish a baseline for future readings.
All the equipment used in handling and installing the SMPs shall not damage or deteriorate the assembly or the
structure into which it is installed. Acceptable methods of SMP installation may include drill and epoxy grout,casting into the fluid RCC/concrete, and/or pressing into the semi-solid RCC/concrete. Driving SMPs into the

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-11

surface of hardened concrete/RCC should be done with caution so as not to damage or crack the finished surface.
The Contractor shall be responsible for any damage to structures resulting from SMP installation.
Data Collection and Records
Baseline survey of the SMPs shall be conducted after a period of 24 hours to allow grout/concrete/RCC curing,
and within 72 hours of installation. Subsequent readings shall be performed in accordance with frequency
schedule in Table 401-1.
13.
Installation of RSGs
GeneralThe RSGs shall be installed at the locations indicated on the Drawings. Maintain access to the RSGs.
Placing
The RSGs shall be installed and monitored by the Contractor.
Metal RSGs shall be installed and surveyed as early as feasible (either as part of structure construction or shortly
thereafter) to establish a baseline for future readings. All the equipment used in handling and installing the RSG
shall not damage or deteriorate the assembly or the structure into which it is installed. Acceptable methods of
RSG installation on the principal spillway inlet may include drill and epoxy grout, or casting into the structural
reinforced concrete. Driving RSGs into the surface of hardened concrete should be done with caution so as not todamage or crack the finished surface. The Contractor shall be responsible for any damage to structures resulting
from RSG installation.
Reinforced concrete RSGs shall be installed on the upstream embankment slope following completion ofembankment fill placement, compaction, and finish grading operations. If necessary, installation of the RSG may
be delayed until after substantial completion of embankment settlement so as to limit differential settlement of the
RSG. The bottom of the RSG shall be founded on compacted earthfill at least 2.5 feet below finish grade.
Subgrade moisture shall be maintained within specifications until concrete placement is complete.
Data Collection and Records
Baseline elevation survey of the RSGs shall be conducted after a period of 24 hours to allow epoxy/grout/concrete
curing and within 72 hours of installation. Subsequent readings shall be performed in accordance with frequency
schedule in Table 401-1. The baseline survey will include surveying the elevation of the staff gauge andpresentation of conversion factors to convert gauge height to NAVD88 elevation. The baseline survey will also
confirm that each staff gauge increment is installed to tolerance.
Reservoir water surface level readings shall be collected using the RSGs during the same working day that each
set of piezometer readings are collected, as described in QUALITY CONTROL and according to the frequency
schedule in Table 401-1.
14.
Field Quality Control
GeneralThe Contractor shall provide and maintain an effective quality control program that fulfills the requirements
found herein and in Construction Specification 94, Contractor Quality Control.
Boring Logs
Submit the original handwritten log and 3 copies in typed format within 2 days of the completion of each hole.
Keep accurate driller logs and record all work accomplished under this contract and deliver complete, legible
copies of these logs and records to the Engineer upon completion of the work or at such other time or times as theContracting Officer may direct. All such records shall be preserved in good condition and order by the Contractor

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-12

until they are delivered and accepted, and the Contracting Officer shall have the right to examine such records at
any time prior to their delivery. Separate logs shall be made for each hole. Use United States Army Corps ofEngineers (USACE) DRILLING LOG, ENG FORM 1836 and 1836A, or other form approved by the Engineer
which provides the required information for the logs. The following information shall be included on the logs orin the records for each hole:
a.
b.
c.
d.
e.

Hole number or designation and elevation of top of hole.
Inclination of the hole.
Make and manufacturer's model designation of drilling equipment.
Dates and time when drilling operations were performed.
USCS classification and interpreted geologic unit, and depths at which they were encountered. This
classification or description shall be made immediately following sampling. Elevation of top of rock.
f. Steel casing seat elevation.
g. Depths and elevations at which core was recovered or attempts made to core including top and bottom
depth of each run.
h. Time required for drilling each run.
i. Percentage of core recovered and rock quality designation per run.
j. Depth and elevation of rod drops, difficult drilling, and other unusual occurrences.
k. Depth and elevation at which groundwater is encountered 1) at first entry during drilling; 2) at the end ofdrilling; and 3) immediately prior to piezometer installation.
l. Depths and elevations at which drill water is lost and regained and amounts.
m. Depth and elevation of bottom of hole, determined by measuring the drill steel length and verifying using
a weight tape immediately prior to piezometer installation.
Piezometer Installation Records
Submit as-built construction detail for each piezometer installed within 1 week of completion of each installation.
The construction detail shall include the following information:a. Piezometer identification number and/or corresponding borehole identification number.
b. Surveyed horizontal position and top elevation and horizontal position for 1) the top of PVC casing; and2) poured concrete pad.
c. Total length, depths, and elevations of the screened interval, and geologic unit in which the piezometer isscreened.
d. Total length and stick-up height of the PVC solid casing.
e. Depths and elevations of the sand filter pack, bentonite seal, cement-bentonite grout backfill, and concretesurface seal.
f. Embedment depth and stick-up height of protective enclosure.
g. Calculated theoretical and actual volumes of annular grout used to backfill, as well as information on
grout top-off.
Well development records shall be submitted within 1 week of development, and shall include the following
information:
a.
b.
c.
d.

Piezometer identification number.
Development method used.
Dates and times of development.
Initial and final well development water quality parameters as indicated in Section 10, INSTALLATIONOF PIEZOMETERS (WELL DEVELOPMENT).
e. Groundwater depth/elevation measurements immediately prior to and immediately following welldevelopment.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-13

Periodic repeat groundwater levels collected after installation shall be submitted according to the frequency
schedule in Table 401-1.
Piezometer Decommission Records
Submit copies of the TCEQ well abandonment forms to document completion of piezometer decommission. The
forms shall indicate the date of decommission, abandonment method, and other required information.
SMP Records
Submit the initial baseline survey of each SMP within 1 week of installation. Periodic repeat survey data of SMPs
collected after installation shall be submitted according to the frequency schedule in Table 401-1.
RSG Records
Submit the initial baseline survey of each RSG installation within 1 week of installation. Periodic repeat elevation
data of RSG measurements collected after installation shall be submitted according to the frequency schedule in
Table 401-1.
Submit reservoir water surface elevation data with each piezometer readings submittal. Reservoir water surface
level readings shall be collected using the RSGs during the same working day that each set of piezometer readings
are collected, according to the frequency Table 401-1. Reservoir water surface level readings shall be presented interms of both gauge height and NAVD88 elevation.
Survey Records
Following completion of all instrument installation, submit an instrumentation plan drawing in the latest versionof AutoCAD which illustrates as-built locations of all instrumentation installed and decommissioned. The
drawing shall include a summary table with surveyed coordinates and elevations of the top of all instruments.
The drawing shall be stamped by the Texas RPLS. The Engineer will provide a base drawing in AutoCAD format
for use by the Contractor.
15.
Maintenance
The Contractor is responsible for maintaining all geotechnical instrumentation in working order for the durationof the contract. Maintain all instrumentation installations until the tunnel is handed over to the Owner.
Immediately repair or replace any damage. Maintenance shall include all work necessary to maintain the ability
to take readings.
16.
Performance Criteria and Acceptance
GeneralGeotechnical Instrumentation shall be considered acceptable when instrument data are repeatable and match
manual readings, or at the discretion of the Engineer.
Surveying Standards
Surveying of instruments shall be performed as follows:a. All vertical elevations shall commence from a minimum of two National Geodectic Survey (NGS) second
order or better published benchmarks.
b. All elevations shall be established to NGS third order standards and certified to those standards by aProfessional Surveyor registered in the State of Texas.
c. All level runs shall be double run (forward and back) or looped into two NGS second order or better
published benchmarks.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-14

d. All elevations shall be established in NAVD88 Datums. Following installation, State Plane Coordinates
shall be established at all instrument locations with a positional accuracy of +/- 1 feet for piezometers,
and +/- 0.01 feet for SMPs.
e. Survey data shall have an accuracy of at least 0.01 feet in the x, y, and z directions unless otherwise
specified.
Replacement of Rejected Instrumentation
Any instrument that fails to meet acceptance criteria and/or is rejected by the Engineer shall be replaced. A
replacement instrument, including a new drill hole (if required), shall be provided by the Contractor at no expense
to the Government. The location of the replacement instrument shall be as directed by the Engineer. Provide allmaterials, supplies, equipment, and labor necessary to provide a new instrument assembly to the satisfaction of
the Engineer. No drilling shall be performed for a replacement instrument until the grouting of all instruments
within 50 feet of the replacement instrument location has been allowed to set for at least 24 hours. Payment will
not be made for rejected instruments and/or instrument which do not meet acceptance criteria. Either remove
rejected instrumentation or leave in place as directed by the Contracting Officer.
17.
Measurement and Payment
Measurement
The work is not measured.
Payment
Payment for instrumentation installation and monitoring shall be made according to the method specified in
Section 18.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-15

18.

Items of Work and Construction Details
Items of work to be performed in conformance with this specification and the construction details
therefore are:a. Bid Item 38, Geotechnical Instrumentation(1)

This item shall consist of furnishing and provide the materials, items, facilities, services,
equipment, fabrication, and qualified personnel necessary to install, maintain, and monitor
geotechnical instrumentation as designated on the drawings and in accordance with therequirements of this specification. This item also includes any pertinent submittals inaccordance with the requirements of Section 4 SUBMITTALS.

(2)

In Section 17, Payment, items of work are paid at the contract lump sum price. Payments
will be made prorated into monthly amounts based on the length of the contract period.
The total of all partial payments for Instrumentation and Monitoring shall not exceed theamount shown on the bid schedule for Instrumentation and Monitoring.

(3)

Items of work subsidiary to this bid item are:(a) Concrete, Class 5000 (Incidental) as specified in Construction Specification 31.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-16

Table 401-1. Instrument Readings Schedule
Instrument
Survey Monitoring
Points (SMP)

Reservoir Gauge

Piezometers

Schedule
1. One set of initial readings immediately after installation.
2. Weekly readings for the first 2 months following installation.
3. Monthly readings thereafter until construction completion.
4. Daily readings when fill or excavation operations occur within 100 feet of SMP. May be reduced
to weekly readings at the discretion of the Contracting Officer.
Elevation survey:
1. One set of initial readings 24 to 72 hours after installation.
2. Monthly readings thereafter until construction completion.
Reservoir water level:
1. One set of initial readings 24 to 72 hours after installation.
2. On same working day as all piezometer readings, preferably within 4 hours of piezometer readings
1. One set of initial readings immediately prior to and after well development.
2. Weekly readings for the first 2 months following installation.
3. Monthly readings thereafter until construction completion.

Table 401-2. Piezometer Installation
Details

ID No.

Location

Approx.
Prop.
GroundElev. (ft
NAVD88)

Est.
Total
Depth
(feet)

PZ-1

Left Side of Prop. ASW(Embankment Crest)

528

62

PZ-2

Right Side of Prop. ASW(Embankment Crest)

528

57

PZ-3

Left Side of Prop. ASW(Embankment Toe)

495

20

PZ-4

Right Side of Prop. ASW(Embankment Toe)

501

31

Est. Screen
Elev. (ft
NAVD88)NestedPiezometer
Screened
Zone

Screened Geologic
Unit

ScreenLength(ft)

Top

BottomTop

BottomUpper (U)Lower (L)Upper (U)Lower (L)Upper (U)Lower (L)Upper (U)Embankment
Residuum
Embank./Residuum
Clayshale
Fill/Leona Fm.
Residuum
Residuum

10
10
10
10
5
5
10

32
52
27
47
7
15
6

42
62
37
57
12
20
16

496
476
501
481
488
480
495

486
466
491
471
483
475
485

Estimated based on B-05
Estimated based on B-05
Estimated based on B-07
Estimated based on B-07
Estimated based on B-603
Estimated based on B-603
Estimated based on B-604

Lower (L)Clayshale

10

21

31

480

470

Estimated based on B-604

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

Est. Screen
Depth (ft)401-17

Remarks

Table 401-3. Piezometer Decommission Details

ID No.

Location

Approx.
Prop.
Ground Elev.
(ft NAVD88)

Est.
Total
Depth
(feet)

BoreholeDiam.
(inch)

Screened
Geologic Unit

ScreenDiam.
(inch)

ScreenLength(ft)

Top

BottomTop

BottomEst. Screen
Depth (ft)Est. Screen Elev.
(ft NAVD88)

Remarks

B-04P

Proposed PSW(Embankment Crest)

526.0

50

8

Residuum/
Clayshale

2.0

20

40

60

486.0

466.0

Refer to GI Report

B-06P

Proposed ASW(Embankment Crest)

525.1

50

8

Clayshale

2.0

20

50

70

475.1

455.1

Refer to GI Report

Table 401-4. Survey Monitoring Point (SMP) Installation Details
Approx. Final
Ground Elev. (ft
NAVD88)ID No.

Location

SMP-01W
SMP-02C
SMP-03C
SMP-04C
SMP-05W
SMP-06W
SMP-07C
SMP-08C

RCC ASW Left Wall (Crest)
RCC ASW Chute (Crest)
RCC ASW Chute (Crest)
RCC ASW Chute (Crest)
RCC ASW Right Wall (Crest)
RCC ASW Left Wall (Midslope)
RCC ASW Chute (Midslope)
RCC ASW Chute (Midslope)

528.9
518.9
518.9
518.9
528.9
515.9
508.9
508.9

Install on top of RCC wall
Install flush with top of RCC step near center
Install flush with top of RCC step near center
Install flush with top of RCC step near center
Install on top of wall
Install on top of wall
Install flush with top of RCC step near center
Install flush with top of RCC step near center

SMP-09C
SMP-10W
SMP-11W
SMP-12C
SMP-13C
SMP-14C
SMP-15W
SMP-16W
SMP-17W
SMP-18W
SMP-19W

RCC ASW Chute (Midslope)
RCC ASW Right Wall (Midslope)
RCC ASW Left Wall (Toe)RCC ASW Chute (Toe)RCC ASW Chute (Toe)RCC ASW Chute (Toe)ASW Right Wall (Toe)Principal Spillway – Impact Basin (Left Wall, Upstream)
Principal Spillway – Impact Basin (Left Wall, Downstream)
Principal Spillway – Impact Basin (Right Wall, Upstream)
Principal Spillway – Impact Basin (Right Wall, Downstream)

508.9
515.9
503.9
488.9
488.9
488.9
503.9
495.7
495.7
490.4
490.4

Install flush with top of RCC step near center
Install on top of wall
Install on top of wall
Install flush with top of end sill
Install flush with top of end sill
Install flush with top of end sill
Install on top of wall
Install on top of wall
Install on top of wall
Install on top of wall
Install on top of wall

SMP-20W

Principal Spillway – Inlet Riser

505.4

Install on top of wall

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

Remarks

401-18

Table 401-5. Reservoir Staff Gauge Installation Details

ID No.

Location

PS-SG-1
PS-SG-2

PSW Inlet Riser
Upstream Embankment at
PSW alignment
Upstream Embankment at
PSW alignment

PS-SG-3

Approx. Elev.
Interval (ftNAVD88)497.0 to 505.4
505.5 to 514.0
515.0 to 527.5

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

Remarks
Install on downstream side of PSW inlet structure wall, hot dip galvanized steel
Install on upstream embankment slope at PSW alignment below crossing berm, reinforced
concrete
Install on upstream embankment slope at PSW alignment above crossing berm, reinforced
concrete

401-19

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

401-20Construction Specification 446 – Grouted Anchor Bars
1.
Scope
The work consists of providing, drilling, installing, and grouting anchor bars required for securing the reinforced
concrete baffle blocks and end sill to the RCC stilling basin slab as shown on the drawings.
2.
References
The publications listed below form a part of this specification to the extent referenced. The publications arereferred to within the text by basic designation only.
1. American Society for Testing and Materials (ASTM):
ASTM A615
Standard Specification for Deformed and Plain Carbon-Steel Bars forConcrete Reinforcement.
ASTM C109
Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or{50mm} Cube Specimens)
ASTM C 1107
Standard Specification for Packaged Dry, Hydraulic-Cement Grout(Nonshrink).
3.
Submittals
Submit the following:
1. Manufacturer’s product data for approval of nonshrink grout.
2. Manufacturer’s certification that product meets specifications.
3. Manufacturer’s surface preparation, mixing, installing, and curing instructions.
4. Proposed method for drilling and preparing holes for grouting, including keeping concrete surfaces wet
before placing grout.
5. Proposed curing method for grout.
4.

Materials
4.1
Anchors
Steel reinforcing bars, ASTM A615, Grade 60, standard deformed bars; uncoated finish; size and length asindicated; cut and bent, where necessary, before installation.
1.
2.

3.
4.

5.

4.2
Packaged Nonshrink Grout:Non-shrink, cementitious pre-proportioned, prepackaged cement-based grout ready for the addition ofwater, meeting or exceeding the requirements of ASTM C 1107.
Water:
a. Clean.
b. Free of detrimental quantities of silt, organic matters, salts, or other impurities.
c. As recommended by grout manufacturer and as approved by the ENGINEER..
Non-metallic, non-shrink, non-corrosive, non-gas-generating.
Grout Properties:
a. Minimum 28-Day Compressive Strength....................................................5000 lb/in2.
b. 28-Day Bond Strength .................................................................................2000 lb/in2.
c. Early Height Change ...................................................................................0.0 to 4.0% expansion
d. Hardened Height Change ............................................................................0.0 to 0.3% expansion
e. Initial setting time, after addition of water: .................................................Approx. one hour at 70º
Mix grout in accordance with manufacturer’s instructions to provide a grout consistency that will flow
into and completely fill the anchor holes with no voids, as approved by the ENGINEER.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

446-1

5.
Holes for Anchors
Lengths indicated on the Drawings are the minimum embedment depths required for the grouted anchor bars. Use
minimum hole diameters and lengths shown on the Drawings unless otherwise approved.
Drill anchor holes by rotary, percussion or coring methods.
After drilling, thoroughly clean each hole first with a water jet and then blowing out with an air jet until no water,
drilling fluid, drill cuttings, dirt or other debris remains. If cleaned holes are left open and become contaminatedwith dirt or other debris and/or water, repeat the cleaning process until anchor holes are clean and free of water.
Unless otherwise approved, when grout in an existing anchor hole is between 2 and 24 hours old, no new anchor
may be drilled closer than 30 feet from the grouted hole, so as not to disturb the initial set of the grout.
6.

7.

Installation
1. Mix, place, and cure non-shrink grout at the locations shown on the Drawings and in accordance withgrout manufacturer's instructions except as otherwise specified or as approved by the ENGINEER.
2. Clean and prepare base concrete surface against which grout will be placed in accordance with
manufacturer’s instruction, as directed by Engineer, or the following.
f. Roughen surface.
g. Remove dirt, laitance loose or defective concrete, curing compound, coatings, and other foreignmaterial.
h. Wash with water.
i. Wet to a surface saturated dry condition, if a delay occurs before placement, rewet to a surface
saturated dry condition.
Field Quality Control

Anchor Installation Records: Keep accurate logs and records of all work accomplished and submit these logs andrecords to the Engineer upon completion of the work.
Provide quality control reports to the Engineer daily and immediately report any deficiencies to the Engineer.
Randomly collect and test six 2-inch grout cubes in accordance with ASTM C109 each day grout is placed. The
Engineer may direct when and where samples will be collected. Test grout samples for compressive strength andexpansion at an approved independent laboratory at 3, 5, 7 and 28 days. Submit results to Engineer within 2 daysof test completion.
8.

Items of work and construction details

Items of work to be performed in conformance with this specification and the construction details are:1. Subsidiary Item, Grouted Anchor Bars
a. This item includes procuring and transporting anchor bar grout and anchor bar materials, anddrilling, installing, and grouting the anchor bars at the locations shown on the Drawings orotherwise approved by the ENGINEER in writing.
b. Separate payment will not be made for this item. Compensation for this item will be included in
the payment for the respective bid item Reinforced Concrete, Structural and Reinforcing Steel.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

446-2

Material Specification 303—Lime1.
Scope
This specification covers the quality of hydrated
lime and quicklime used in the treatment ofclayey soils.
2.

Qualitya.
(1)b.

Quicklime(1)

Hydrated Lime
Hydrated lime shall meet thefollowing requirements whentested in accordance withASTM C 25 or ASSHTO T 219.

Minimum available lime
index, reported as CaO –90%.

Minimum available lime,
reported as Ca(OH)2 = 90%

Maximum carbon dioxide (asreceived basis) – 5%.

Maximum carbon dioxide (asreceived basis) – 7%
(2)

The physical gradation of
hydrated lime when tested inaccordance with ASTM C 110
shall meet the requirements of
ASTM C 977.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

Quicklime shall be in the pebble
or pelletized form only if notapplied as a slurry. Maximum
particle size in any dimension
shall be ¾ inch. Quicklime
shall meet the following
requirements when tested inaccordance with ASTM C 25:(2)

Quicklime shall have aminimum slaking temperaturerise of 40° C in three minutes
when tested in accordance withASTM C 110.

303-1

This page intentionally left blank.

NRCS-8/21
TX-PLUM CREEK, SITE 21 REHABILITATION

303-2

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 521—Aggregates for Drainfill and Filters
1. Scope
This specification covers the quality of mineral aggregates for the construction of drainfill and filters.
2. Quality
Drainfill and filter aggregates shall be sand, gravel, or
crushed stone or mixtures thereof. Aggregates shallbe composed of clean, hard, durable, mineral particles
free from organic matter, clay balls, soft particles, orother substances that would interfere with the freedraining properties of the aggregates.
Coarse aggregate may be crushed limestone or othermaterial that has limestone particles included. Aggregates from crushed limestone shall be thoroughly
washed and screened to remove limestone dust, limestone fines, and fine soil particles. Limestone shallnot be used for fine aggregates except in combination
with other material, such that not more than 5 percentof the portion finer than the No. 4 sieve shall be limestone.

Aggregates shall be tested for soundness according
to ASTM Method C88 and shall have a weighted average loss in 5 cycles of not more than 12 percent whensodium sulfate is used or 18 percent when magnesium
sulfate is used.

3. Grading
Drainfill and filter aggregates shall conform to thespecified grading limits after being placed or after
being compacted when compaction is specified. Grading shall be determined by ASTM Method C136. The
percentage of material finer than the No. 200 sieve
shall be determined by the method in ASTM Designation C117.
4. Storing and handling
Drainfill and filter aggregates shall be stored and handled by methods that prevent segregation of particle
sizes or contamination by mixing with other material.

(210–VI–NEH, January 2014)

521–1

Chapter 3

National Standard Material
Specifications(210–VI–NEH, January 2014)

Part 642
National Engineering Handbook

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 522—Aggregates for Portland Cement Concrete
1. Scope
This specification covers the quality of fine aggregate
and coarse aggregate for use in the manufacture of
portland cement concrete.
2. Quality
Aggregate shall conform to the requirements of ASTM
Specification C 33 for the specified sizes. Aggregatesthat fail to meet any requirement may be accepted
only when either:a. The specified alternate conditions of acceptance can be proven before the aggregates areused on the job and within a period such thatno work under the contract will be delayed by
the requirements of such proof,orb. The specification for concrete expressly contains a provision of special mix requirements tocompensate for the effects of the deficiencies.

3. Reactivity with alkalies
The potential reactivity of aggregates with the alkalies
in cement shall be evaluated by petrographic examination and, where applicable, the chemical methodof test, ASTM Designation C 289, or by the results ofprevious tests or service records of concrete madefrom similar aggregates from the same source. The
standards for evaluating potential reactivity shall be as
described in ASTM Specification C 33, appendix A1.

Aggregates indicated by any of the above to be potentially reactive shall not be used except under one of
the following conditions:a. Applicable test results of mortar bar tests madeaccording to ASTM Method C 227 are available
which indicate an expansion of less than 0.10
percent at 6 months in mortar bars made withcement containing not less than 0.8 percent
alkalies expressed as sodium oxide; orb. Concrete made from similar aggregates fromthe same source has been demonstrated to besound after 3 years or more of service underconditions of exposure to moisture and weather similar to those anticipated for the concrete
under these specifications.
Aggregates indicated to be potentially reactive, but
within acceptable limits as determined by mortar bar
test results or service records, shall be used only withlow alkali cement, containing less than 0.60 percent
alkalies expressed as sodium oxide.

4. Storing and handling
Aggregates of each class and size shall be stored andhandled by methods that prevent segregation of particles sizes or contamination by intermixing with othermaterial.

(210–VI–NEH, May 2001)

522–1

(210–VI–NEH, May 2001)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 523—Rock for Riprap
1.

Scope

This specification covers the quality of rock to be used in the construction of rock riprap.

2.

Quality

Individual rock fragments must be dense, sound, and free from cracks, seams, and other defects
conducive to accelerated weathering. Except as otherwise specified, the rock fragments must be
angular to subrounded. The least dimension of an individual rock fragment must not be less than onethird the greatest dimension of the fragment. ASTM D4992 provides guidance on selecting rock.
Except as otherwise provided, the rock must be tested and must have the following properties:
Rock type 1• Bulk specific gravity (saturated surface-dry basis)—Not less than 2.5 when tested inaccordance with ASTM D6473 on samples prepared as described for soundness
testing.
• Absorption—Not more than 2 percent when tested in accordance with ASTM D6473 on
samples prepared as described for soundness testing.
• Soundness—The weight loss in five cycles must not be more than 10 percent when sodium
sulfate is used or more than 15 percent when magnesium sulfate is used.
Rock type 2• Bulk specific gravity (saturated surface-dry basis)—Not less than 2.5 when tested inaccordance with ASTM D6473 on samples prepared as described for soundness testing.
• Absorption—Not more than 2 percent when tested in accordance with ASTM D6473 on
samples prepared as described for soundness testing.
• Soundness—The weight loss in five cycles must be not more than 20 percent whensodium sulfate is used or more than 25 percent when magnesium sulfate is used.
Rock type 3• Bulk specific gravity (saturated surface-dry basis)—Not less than 2.3 when tested inaccordance with ASTM D6473 on samples prepared as described for soundness testing.
• Absorption—Not more than 4 percent when tested in accordance with ASTM D6473
on samples prepared as described for soundness testing.
• Soundness—The weight loss in five cycles must be not more than 20 percent whensodium sulfate is used or more than 25 percent when magnesium sulfate is used.

3. Methods of soundness testing
Rock cube soundness—The sodium or magnesium sulfate soundness test for all rock types (1,2, or 3) must be performed on a test sample of 5,000 ± 300 grams of rock fragments,
reasonably uniform in size and cubical in shape, and weighing, after sampling, about 100 grams
each. They must be obtained from rock samples that are representative of the total rock mass,
as noted in ASTM D4992, and that have been sawed into slabs as described in ASTM D5121.
The samples must further be reduced in size by sawing the slabs into cubical blocks. The
thickness of the slabs and the size of the sawed fragments must be determined by the size ofthe available test apparatus and as necessary to provide, after sawing, the approximate 100-gramsamples. The cubes must undergo five cycles of soundness testing in accordance with ASTM C88.
(210–642–H, Amend.2, Sept. 2018)
523–1

Chapter 3

Material Specification 523

National Standard Material
Specifications

Part 642
National Engineering Handbook

Rock for Riprap (continued)

Internal defects may cause some of the cubes to break during the sawing process or during theinitial soaking period. Do not test any of the cubes that break during this preparatory process.
Such breakage, including an approximation of the percentage of cubes that break, must be notedin the test report.
After the sample has been dried following completion of the final test cycle and washed toremove the sodium sulfate or magnesium sulfate, the loss of weight must be determined bysubtracting from the original weight of the sample the final weight of all fragments thathave not broken into three or more fragments.
The test report must show the percentage loss of the weight and the results of the qualitative
examination.

Rock slab soundness—When specified, the rock must also be tested in accordance with ASTM
D5240. Deterioration of more than 25 percent of the number of blocks is cause for rejection of rockfrom this source. Rock must also meet the requirements for average percent weight loss stated below.
•

For projects located north of the Number 20 Freeze-Thaw Severity Index Isoline (fig.
523–1), unless otherwise specified, the average percent weight loss for Rock Type 1 must
not exceed 20 percent when sodium sulfate is used or 25 percent when magnesium
sulfate is used. For Rock Types 2 and 3, the average percent weight loss must not exceed
25 percent for sodium sulfate soundness or 30 percent for magnesium sulfate soundness.

•

For projects located south of the Number 20 Freeze-Thaw Severity Index Isoline, unlessotherwise specified, the average percent weight loss for Rock Type 1 must not exceed 30
percent when sodium sulfate is used or 38 percent when magnesium sulfate is used. For
Rock Types 2 and 3, the average percent weight loss must not exceed 38 percent for sodium
sulfate soundness or 45 percent for magnesium sulfate soundness.

(210–642–H, Amend. 2, Sept. 2018)

523–2

Chapter 3

National Standard Material
Specifications

Material Specification 523

Figure 523–1

4.

Part 642
National Engineering Handbook

Rock for Riprap (continued)

Number 20 Freeze-Thaw Severity Index Isoline (map approximates the map in ASTM D5312)

Field durability inspection

Rock that fails to meet the material requirements stated above (if specified), may be accepted
only if similar rock from the same source has been demonstrated to be sound after 5 years or moreof service under conditions of weather, wetting and drying, and erosive forces similar to thoseanticipated for the rock to be installed under this specification.
A rock source may be rejected if the rock from that source deteriorates in less than 5 years undersimilar use and exposure conditions expected for the rock to be installed under this specification,even though it meets the testing requirements stated above.
Deterioration is defined as the loss of more than one-quarter of the original rock volume, or severe
cracking that would cause a block to split. Measurements of deterioration are taken from linear or
surface area particle counts to determine the percentage of deteriorated blocks. Deterioration of
more than 25 percent of the pieces is cause for rejection of rock from the source.

5.

Grading

The rock must conform to the specified grading limits after it has been placed within the matrix ofthe rock riprap. Grading tests must be performed, as necessary, according to ASTM D5519, Method
A, B, or C, as applicable.
(210–642–H, Amend. 2, Sept. 2018)

523–3

Chapter 3

Material Specification 523

National Standard Material
Specifications

Part 642
National Engineering Handbook

Rock for Riprap (continued)(210–642–H, Amend. 2, Sept. 2018)

523–4

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 524—Aggregates for Roller Compacted
Concrete
1. Scope
This specification covers the quality of aggregate foruse in the manufacture of roller compacted concrete(RCC).
2. Quality
Aggregate shall conform to the quality requirements of
ASTM Specification C33.
3. Gradation
Aggregate gradation shall be within the limits provided
below for the total aggregate weight in a unit volume
of RCC. For the sieve sizes shown below that arelarger than #4, no more than 20 percent of the total
aggregate shall be retained on an individual sieve. For
sieve sizes smaller than 3/8 inch, at least 3 percent of
the total aggregate shall be retained on each sieve.
Sieve size

Percent passing2"		
1-1/2"
1"		
3/4"
1/2"
3/8"
#4		
#8		
#16
#30
#50
#100
#200

100
85–10070–100
60–84
50–70
40–60
32–50
26–42
20–35
14–28
8–22
4–15
0–7

Particle shape—The amount of flat and elongatedparticles with a length-to-width or width-to-thickness
ratio greater than 3:1, as determined by ASTM D4791,
shall not exceed 25 percent on any individual sieve
size group nor a weighted average of 20 percent for allof the sieve sizes in the total gradation.

4. Reactivity with alkalies
The potential reactivity of aggregates with the alkalies
in cement shall be evaluated by petrographic examination and, where applicable, the chemical method of
test, ASTM C289, or by the results of previous tests orservice records of RCC or concrete made from similar
aggregates from the same source. The standards forevaluating potential reactivity shall be as described in
ASTM C33, appendix A1.
Aggregates indicated by any of the above to be potentially reactive shall not be used unless applicable test
results of mortar bar tests made according to ASTM
Method C227 are available and indicate an expansionof less than 0.10 percent at 6 months in mortar bars
made with cement containing not less than 0.8 percent
alkalies expressed as sodium oxide.
Aggregates indicated to be potentially reactive, but
within acceptable limits as determined by mortar bar
test results or service records, shall be used only withlow alkali cement, containing less than 0.60 percent
alkalies expressed as sodium oxide.

Unless otherwise specified, the fines (material passing
the #200 sieve) shall have a plasticity index less thanfour.

5. AcceptanceAggregates that fail to meet any requirement may be
accepted only when the specification for RCC expressly contains either:a. Special provisions for acceptance that can beproven before the aggregates are used on the
job and within a period such that no work under the contract will be delayed by the requirements of such proof, or(210–VI–NEH, January 2014)

524–1

Chapter 3

Material Specification 524

National Standard Material
Specifications

Aggregates for Roller Compacted Concrete (continued)b. Special provisions for specific mix requirements to compensate for the effects of the
deficiencies.

6. Storing and handling
Aggregates shall be stored in stockpiles at specified
storage areas. Separators, such as timbers, boards, orpre-cast concrete panels, shall be used between adjacent stockpiles to prevent the contamination and intermixing of dissimilar materials. The contractor shallbe responsible for providing a system that reliably
and consistently stockpiles the aggregates and allows
the withdrawal of the aggregates from the stockpiles
without contamination or segregation. Segregated orcontaminated aggregates will not be allowed in production of RCC.

524–2

Part 642
National Engineering Handbook(210–VI–NEH, January 2014)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 531—Portland Cement
1.

Scope

This specification covers the quality of Portland cement.

2. Quality
Portland cement shall conform to the requirementsof ASTM Specification C 150 for the specific types of
cement. When Type I Portland cement is specified,Type IS Portland blast-furnace slag cement or Type IP
Portland-pozzolan cement conforming to the requirements of ASTM Specification C 595 may be used unless prohibited by the specifications.

When air-entraining cement is required, the contractor shall furnish the manufacturer's written statement
providing the source, amount, and brand name of the
air-entraining component.

3. Storage at the construction site
Cement shall be stored and protected at all times fromweather, dampness, or other destructive elements. Cement that is partly hydrated or otherwise damaged will
not be accepted.

(210–VI–NEH, May 2001)531–1

531–2(210–VI–NEH, May 2001)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 532—Supplementary Cementitious
Materials
1. Scope
This specification covers the quality of supplementary
cementitious materials for concrete.
2. Quality
Fly ash used as a partial substitution of Portland
cement shall conform to the requirements of ASTM
C618, Class Cor F except the loss on ignition shall not
exceed 3 percent, unless otherwise specified. Lot-to-lot
variation in the loss on ignition shall not exceed 1 percent. When specified, fly ash shall conform to one ormore of the supplementary optional physical requirements listed in ASTM C618.
Blast-furnace slag used as a partial substitution of
portland cement shall conform to ASTM Standard
C989 for ground granulated blast-furnace slag.
Silica fume used as a partial substitution of Portland
Cement shall conform to ASTM C1240.

(210–VI–NEH, April 2015)532–1

(210–VI–NEH, April 2015)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 533—Chemical Admixtures for Concrete
1. Scope
This specification covers the quality of chemical admixtures for manufacturer of portland cement concrete.
2. Quality
Air-entraining admixtures shall conform to the requirements of ASTM Specification C 260.
Water-reducing and/or retarding admixtures shall conform to the requirements of ASTM Specification C 494,
Types A, B, D, F, or G.

Plasticizing or plasticizing and retarding admixtures
shall conform to ASTM C 494, Types F or G, or C 1017
as applicable.
Accelerating or water-reducing and accelerating admixtures shall be noncorrosive and conform to the requirements of ASTM Specification C 494, Types C and
E. The manufacturer shall provide long-term test data
results from an independent laboratory verifying thatthe product is noncorrosive when used in concrete
exposed to continuously moist conditions.

(210–VI–NEH, November 2005)

533–1

(210–VI–NEH, November 2005)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 534—Concrete Curing Compound
1. Scope
This specification covers the quality of liquid membrane-forming compounds suitable for spraying on
concrete surfaces to retard the loss of water during
the concrete curing process.
2. Quality
The curing compound shall meet the requirements ofeither ASTM Specification C 309 or C 1315. If Type 1 is
specified, a fugitive dye shall be used.

3. Delivery and storage
All curing compounds shall be delivered to the site of
the work in the original container bearing the name of
the manufacturer and the brand name. The compoundshall be stored in a manner that prevents damage tothe container and protects water-emulsion types fromfreezing.

(210–VI–NEH, January 2009)534–1

(210–VI–NEH, January 2009)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 535—Preformed Expansion Joint Filler
1. Scope
This specification covers the quality of preformed
expansion joint fillers for concrete.
2. Quality
Preformed expansion joint filler shall conform to therequirements of ASTM Specification D 1752, Type I,
Type II, or Type III, unless bituminous type is specified.
Bituminous type preformed expansion joint filler shallconform to the requirements of ASTM Specification D
994, or D 1751.

(210–VI–NEH, May 2001)

535–1

(210–VI–NEH, May 2001)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 536—Sealing Compound for Joints forConcrete and Concrete Pipe
1. Scope
This specification covers the quality of sealing compound for filling joints in concrete pipe and concrete structures.
2. Type
The compound must be a cold-application material unless otherwise specified.
3. Quality
The sealing compound must conform to the requirements of one of the following specifications:• ASTM Specification C990—Joints for concrete pipe, manholes, and precast box sections using preformed
flexible joint sealants.
• ASTM Specification C877—External sealing bands for concrete pipe, manholes, and precast box sections.
• ASTM Specification D6690—Standard Specification for Joint and Crack Sealants, Hot Applied, forConcrete and Asphalt Pavements.
• ASTM Specification C920—Elastomeric joint sealants for cold applied sealing and caulking of joints on
mortar and concrete structures not subject to fuel spills. Use type S or M, grade NS for vertical joints; usetype S or M, grade P or NS for horizontal joints. For class 25, use type M.
The sealing compound if used with other joint material, such as fillers or gaskets, must becompatible.

(210–642–H, Amend. 2, Sept. 2018)

536–1

Chapter 3

National Standard Material
Specifications(210–VI–NEH, Amend. 2, Sept. 2018)

Part 642
National Engineering Handbook

536–2

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 537—Nonmetallic Waterstops
1. Scope
This specification covers nonmetallic waterstops foruse in joints of concrete structures.
2. Classification
Classes—Nonmetallic waterstops shall be of the following classes, as specified:Class I shall be fabricated of either natural orsynthetic rubber.

occurs. Flanges may be of uniform thickness
or may have either a converging or a diverging
taper toward the edges. Auxiliary positioningor nailing flanges may be provided as long as
the functioning of the web bulb is not altered.

Class II shall be fabricated of vinyl chloride
polymer or copolymer.

Type B shall have ribbed anchor flanges anda smooth web containing a hollow tubular
center bulb having a wall thickness equal to atleast one-half the web thickness, and the inside
diameter (D) specified in the specifications or
shown on the drawings. Flanges may be of uniform thickness or may have either a converging
or a diverging taper toward the edges.
Type C shall have a single, circular bulb-type
anchor flange at each edge and a smooth web.
Type D shall have a single, circular bulb-type
anchor flange at each edge and a smooth web
containing a hollow tubular center bulb having
a wall thickness equal to a least one-half the
thickness of the web, and the inside diameter(D) specified in the contract.
Type E shall have ribbed anchor flanges and a
web molded or extruded in the form of a roundor U-shaped bulb of the dimensions specified
in the contract or shown on the drawings. The
web bulb shall be connected at the open-end of
the U by a thin membrane having a minimum
thickness of 1/64 inch and a maximum thickness of 1/5 of the web thickness and design toprevent infiltration of wet concrete into thebulb and to tear when expansion of the joint

Types of nonmetallic waterstops

Type A

Type B

D

Type A shall have ribbed anchor flanges anda smooth web. Flanges may be of uniform
thickness or may have either a converging or adiverging taper toward the edges.

Figure 537–1

WType CType D

D

Types—Nonmetallic waterstops may be either split
or solid and shall conform to the following types, as
specified (see fig. 537–1):

Type E

Type F(210–VI–NEH, May 2001)

537–1

Chapter 3

Material Specification 537

National Standard Material
Specifications

Part 642
National Engineering Handbook

Nonmetallic Waterstops (continued)

Type F shall have ribbed anchor flanges withat least two extra heavy ribs designed to resist
displacement of the waterstop during concrete
placement on each flange, and a smooth web
having a positioning or nailing flange attachedat the center.

• Tensile strength shall be a minimum of 1,400
pounds per square inch.

Type G shall be of special design conforming
to the details shown on the drawings.

• There shall be no sign of failure due to flange
brittleness at a temperature of 0 degrees Fahrenheit nor of web brittleness at a temperatureof minus 35 degrees Fahrenheit.

Sizes—Waterstops of types A through F shall be of thesizes specified in the specifications or shown on thedrawings and listed in table 537–1 of this specification.
Type G waterstops shall have the dimensions shownon the drawings.

3. Physical requirements
The extruded or molded material shall exhibit theproperties specified herein when tested by the methods specified in section 4 of this specification.
Class I waterstops• Hardness as determined by the Shore A durometer method shall be a minimum of 60.
• Specific gravity shall be a maximum of 1.2.

• Ultimate elongation of the web shall be a minimum of 280 percent, and the flanges shall be aminimum of 200 percent.

Table 537–1

Sizes of waterstops

Sizedesignation

Web thickness(T) (inches)

Width (W)(inches)

1

1/16

5 1/4

2

3/32

3 3/4

3

3/32

4

4

3/32

5 1/4

5

3/32

6

6

1/8

4

7

1/8

5 1/4

• Tensile strength shall be a minimum of 2,500
pounds per square inch.

8

1/8

6

• Ultimate elongation shall be a minimum of 450
percent.

9

5/32

4

10

5/32

4 1/2

11

5/32

9

12

3/16

4

13

3/16

5

14

3/16

6

• Decrease in tensile strength and ultimate elongation after aging shall not exceed 20 percent.

15

3/16

9

16

1/4

6

• There shall be no sign of failure due to brittleness at a temperature of minus 35 degrees
Fahrenheit.

17

1/4

9

18

3/8

5

19

3/8

6

Class II waterstops• Hardness as determined by the Shore A durometer method shall be a minimum of 60.

20

3/8

9

21

1/2

6

22

1/2

9

• Specific gravity shall be a maximum of 1.4.

23

1/2

12

• Compression set shall be a maximum of 30
percent.
• Water absorption in weight measurements shallnot exceed 5 percent.

537–2(210–VI–NEH, May 2001)

Chapter 3

Material Specification 537

National Standard Material
Specifications

Part 642
National Engineering Handbook

Nonmetallic Waterstops (continued)• Decrease in either tensile strength or ultimate
elongation after accelerated extraction shallnot exceed 15 percent.
• Results of alkali exposure:a. After immersion for 7 days, the sample shallexhibit no loss of weight and a maximum
weight gain of 0.25 percent, and the hardness measured by the Shore A durometer
method shall not vary more than 5 points
either plus or minus from the untreatedsample.
b. After immersion for 30 days, the sample
shall exhibit no loss of weight and a maximum weight gain of 0.40 percent, and thedimensions of the treated sample shall notvary by more than 1 percent from the untreated sample.

4. Test methods
Testing shall be conducted by the methods citedherein. All cited test methods are included in ASTM as
follows:
a. Hardness shall be determined by ASTM D 2240.
b. Specific gravity shall be determined by ASTM D
792.
c. Tensile strength shall be determined by ASTM
D 412 for Class I waterstops and ASTM D 638
for Class II waterstops.
d. Ultimate elongation shall be determined by
ASTM D 412 for Class I waterstops and ASTM
D 638 for Class II waterstops.

i. Accelerated extraction shall be accomplishedby procedures outlined by United States Army
Corps of Engineers (USACE), Concrete Research Division (CRD) C 572 under the following conditions:(1) Samples shall not be less than 1/16 inch
nor more than 1/8 inch in thickness.
(2) The immersion medium shall be a solution
prepared by dissolving 5 grams of chemically pure sodium hydroxide and 5 gramsof chemically pure potassium hydroxide in
1 liter of water.
(3) The samples shall be immersed in themedium for 14 days at a temperature of
145 degrees Fahrenheit, plus or minus 5
degrees Fahrenheit.
(4) During the period of immersion, air shallbe gently bubbled through the medium
from a 0.25-inch diameter glass tube at an
approximate rate of one bubble per second.
(5) Fresh medium shall be provided each day.
(6) Samples need not be dipped in acetone.
j. The effects of alkalies shall be determined by
USACE CRD C 572 under the following conditions:(1) Sample shall have a maximum thickness of
0.25 inch.
(2) The immersion medium shall be as described for accelerated extraction above.

e. Compression set shall be determined by ASTM
D 395.

(3) Fresh medium shall be provided every
7days.

f. Water absorption shall be determined by ASTM
D 570.

(4) The samples shall be immersed in the medium for 30 days.

g. Tensile strength and ultimate elongation after
aging shall be determined by ASTM D 412 forClass I waterstops and ASTM D 638 for Class II
waterstops.

(5) Samples need not be dipped in acetone.

h. Brittleness shall be determined by ASTM D 746
for Class II waterstops.

5. Condition
Waterstops shall be extruded or molded in such amanner that the material is dense and homogeneous
throughout and free from voids, tears, thins, indentations, or other imperfections. Unless otherwise(210–VI–NEH, May 2001)

537–3

Chapter 3

Material Specification 537

National Standard Material
Specifications

Nonmetallic Waterstops (continued)

specified, waterstops shall be symmetrical in shapeand uniform in dimensions and shall be furnished incontinuous strips a minimum length of 50 feet. Factory
splices shall have a minimum tensile strength of 50
percent of the unspliced section.

6. Packaging and storing
Waterstops shall be packaged and stored by methods
that provide protection from prolonged exposure todirect sunlight and/or excessive heat.

537–4(210–VI–NEH, May 2001)

Part 642
National Engineering Handbook

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 539—Steel Reinforcement (for concrete)
1. Scope
This specification covers the quality of steel reinforcement for reinforced concrete.
2. Quality
All reinforcement shall be free from loose or flaky rust,soil, oil, grease, paint, or other deleterious matter.
Steel bars for concrete reinforcement shall be grade40, 50, or 60 deformed bars conforming to one of thefollowing specifications:• Deformed and plain billet-steel bars for concrete reinforcement—ASTM A 615

3. Dimensions of welded wire reinforcement
Gauges, diameters, spacing, and arrangement of wires
for welded steel wire fabric shall be as defined for the
specified style designations.
4. Storage
Steel reinforcement inventories at the site of the work
shall be stored above the ground surface on platforms,
skids, or other supports and shall be kept clean andprotected from mechanical injury and corrosion.

• Rail-steel deformed bars for concrete reinforcement—ASTM A 996• Axle-steel deformed bars for concrete reinforcement—ASTM A 996
Dowels shall be plain round bars conforming to thesame specifications listed above for steel bars.
Fabricated deformed steel bar mats for concrete
reinforcement shall conform to the requirements of
ASTM A 184.
Plain steel welded wire reinforcement for concrete
reinforcement shall conform to the requirements of
ASTM A 185.
Deformed steel welded wire reinforcement for
concrete reinforcement shall conform to the requirements of ASTM A 497.
Epoxy-coated steel bars for concrete reinforcement
shall conform to the requirements of ASTM A 775.

(210–VI–NEH, January 2009)539–1

(210–VI–NEH, January 2009)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 541—Reinforced Concrete Pressure
Pipe
1. Scope
This specification covers the quality of reinforced concrete pressure pipe and fittings.
2. Manufacture and fabrication
The pipe, the material used in its manufacture, and themethods of fabrication shall conform to the requirements of the following specifications applicable to thespecified type of pipe.
Steel cylinder type, pre-stressed—AWWA Standard
C301 for Pre-stressed Concrete Pressure Pipe, Steel
Cylinder Type, for Water and Other Liquids.
Steel cylinder type, not pre-stressed—AWWA
Standard C300 for Reinforced Concrete Pressure Pipe,
Steel Cylinder Type, for Water and Other Liquids.
Noncylinder type, not pre-stressed—AWWA Standard C302 for Reinforced Concrete Pressure Pipe,
Non-Cylinder Type, for Water and Other Liquids.
Steel cylinder type, pre-tensioned—AWWA Standard C303 for Concrete Pressure Pipe, Bar-Wrapped,
Steel Cylinder Type for Water and Other Liquids.
Low head pressure pipe—ASTM Specification C361.
The following specification sections shall not apply:• AWWA C300 and C301, sections 1.5 and 1.6.
• AWWA C302 and C303, sections 4.2 and 4.3.

3. Design
The actual pipe and fittings shall be designed by the
manufacturer to withstand the specified external loads
and internal pressures. Designs shall be by either ofthe following methods as applicable to the type of pipe
specified:
Indirect design—ASTM C497 for Standard Test
Method for Concrete Pipe, Manhole Sections, or Tile.
Pipe design shall be based on the results of external
crushing strength tests on a minimum 2-foot length ofpipe or a specimen of equivalent size, design, and material. The test shall demonstrate the following bearing
loads:• For pipe manufactured according to ASTM
C361, AWWA C300, or AWWA C302, the load required to produce a 0.01-inch crack 1 foot long.
• For pipe manufactured according to AWWA
C301, the load required to produce a 0.001-inch
crack 1 foot long or the load 10 percent greaterthan the specified three-edge bearing strength,
whichever occurs first.
In lieu of actual testing for this contract, pipe design
may be based on design curve previously approved
and published by the Natural Resources Conservation
Service.
Direct design—AWWA C304 for Design of PreStressed Concrete Cylinder Pipe or AWWA Manual M9for Concrete Pressure Pipe. Pipe design shall be basedon structural analysis and design calculations.
Standard design—ASTM C361 for Reinforced Concrete Low Head Pressure Pipe. Pipe design shall be as
published in the standard.

(210–VI–NEH, May 2001)

541–1

Chapter 3

Material Specification 541

National Standard Material
Specifications

Reinforced Concrete Pressure Pipe (continued)

4. Steel reinforcement
The steel reinforcements shall conform to the requirements of the specifications cited in section 2 for the
specified type of pipe except that elliptical reinforcing
cages or other reinforcements that require special orientation of the pipe during placement are not allowed.
5. Joints
The pipe joints shall conform to the requirements of
the applicable specification for the pipe. They shallbe bell-and-spigot type or double-spigot-and-sleevetype and shall have a positive groove in the spigot to
contain the rubber gasket. The size and shape of thegroove shall be such that it prevents displacementof the gasket by either internal or external waterpressure when the joint is in any position within therequired range of movement capability. Joint sleeves,also referred to as collars or coupling bands, shallconform to the requirements for bell rings in the applicable pipe specification.
The joints shall be constructed to permit relative
movement of the adjoining pipe sections with no
reduction of watertightness. The joint length and thelimiting angle defining the required capability of relative movement at each joint shall be no less than specified.
Joint length refers to the permissible axial movementin the joint. It is defined as the maximum distancethrough which the spigot can move, relative to the bell
or sleeve, from the fully engaged to the fully extended
condition of the joint when the adjoining pipe sections
are in parallel, concentric alignment. The joint is considered to be fully engaged when the spigot is inserted
as far as it will go into the bell or sleeve and is fully
extended when it is inserted the least amount that will
ensure full confinement of the gasket and complete
watertightness.

541–2

Part 642
National Engineering Handbook

Joint length specified for double-spigot joints refers
to the permissible movement in each of the spigot-tosleeve connections, not the sum of the two.
The limiting angle of the joint is defined as the maximum deflection angle between adjoining pipe sections
the joint will permit before the outer surface of the
spigot comes into direct contact with inside of themating bell or sleeve. If both spigot-to-sleeve connections of a double-spigot joint permit angular movement, the limiting angle of the joint is the sum of thetwo deflection angles permitted by the two connections.

6. Gaskets
The pipe joint gaskets shall conform to the requirements of the specifications cited in section 2 of thisspecification. They shall be endless rubber gaskets
having circular cross section. The cross-sectional
diameter of the gaskets shall conform to the pipe
manufacturer's recommendation for the type and sizeof pipe furnished.
7. Marking
All pipe sections and special fittings shall be marked
by the manufacturer with the manufacturer's name ortrademark, the date of manufacture, the nominal size,
design head, design external load, and the structuresite for which it was designed and manufactured.
8. Certification
All component material and actual pipe fabrication
shall be tested, inspected, and documented as prescribed in the manufacturing specifications for thetype of pipe specified. All documentation as noted in
the manufacturing specifications shall be submitted
to the engineer. Documentation shall include current
test reports on steel and steel wire reinforcing andcompression tests of concrete used in the manufactureof the furnished pipe. Current tests are those that havebeen conducted within the last year.

(210–VI–NEH, May 2001)

Chapter 3

Material Specification 541

National Standard Material
Specifications

Part 642
National Engineering Handbook

Reinforced Concrete Pressure Pipe (continued)

For pipe design based on actual external crushingstrength tests, the engineer shall witness the actualtest.
For pipe design based on published design curves, acopy of the appropriate design curve marked to show
the resultant concrete core stress and corresponding three-edge bearing load and a specification sheet
showing all data and dimensions necessary to calculate the resultant core stress for the pipe furnishedshall be submitted to the engineer.
For pipe design based on structural analysis and calculations, such analysis and calculations shall be submitted to the engineer. Printouts of such calculations bycomputer programs shall be sufficiently detailed toenable comparison with standardized procedures andmethods.
Drawings, details, and descriptions of the pipe joints
as necessary to show that the joint conforms to thespecified requirements shall also be submitted.

(210–VI–NEH, May 2001)

541–3

(210–VI–NEH, May 2001)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 547—Plastic Pipe
1. Scope
This specification covers the quality of poly vinyl chloride (PVC), polyethylene (PE), high-density polyethylene(HDPE), and acrylonitrile-butadiene-styrene (ABS) plastic pipe, fittings, and joint materials.
2. Material
Pipe—The pipe must be as uniform as commercially practicable in color, opaqueness, density, and other specified
physical properties. It must be free from visible cracks, holes, foreign inclusions, or other defects. The dimensionsof the pipe must be measured as prescribed in ASTM D2122.
Unless otherwise specified, the pipe must conform to the requirements listed in this specification and theapplicable reference specifications in table 547–2, the requirements specified in Construction Specification 45,
Plastic Pipe, and the requirements shown on the drawings.

Fittings and joints—Fittings and joints must be of a schedule, SDR or DR, pressure class, external load
carrying capacity, or pipe stiffness that equals or exceeds that of the plastic pipe. The dimensions of fittingsand joints must be compatible with the pipe and measured in accordance with ASTM D2122. Joint and fitting
material must be compatible with the pipe material. The joints and fittings must be as uniform as commerciallypracticable in color, opaqueness, density, and other specified physical properties. They must be free fromvisible cracks, holes, foreign inclusions, or other defects.
Fittings and joints must conform to the requirements listed in this specification, the requirements of theapplicable specification referenced in the ASTM or AWWA specification for the pipe, the requirements specified
in Construction Specification 45, and the requirements shown on the drawings.

Solvents—Solvents for solvent welded pipe joints must be compatible with the plastic pipe used and must
conform to the requirements of the applicable specification referenced in the ASTM or AWWA specification forthe pipe, fitting, or joint.

Gaskets—Rubber gaskets for pipe joints must conform to the requirements of ASTM F477, Elastomeric Seals(Gaskets) for Jointing Plastic Pipe.

3. Perforations
When perforated pipe is specified, perforations must conform to the following requirements unless otherwise
specified in Construction Specification 45 or shown on the drawings:
a. Perforations must be either circular or slots.
b. Circular perforations must be 1/4 ± 1/16-inch diameter holes arranged in rows parallel to the axis of
the pipe.
c. Perforations must be evenly spaced along each row such that the center-to-center distance between
perforations is not less than eight times the perforation diameter. Perforations may appear at theends of short and random lengths. The minimum perforation opening per foot of pipe must be as
shown in table 547–1.

(210–642–H, __ Ed., Amend. __ Oct 2017)

547–1

Chapter 3

Material Specification 547

National Standard Material
Specifications

Part 642
National Engineering Handbook

Plastic Pipe (continued)

Table 547–1
Nominalpipe size

Perforations
Minimum number of rows
circular

slot

(in)

Minimum
opening/foot
(in2)

4

4

2

0.22

6

4

2

0.44

8

4

2

0.44

10

4

2

0.44

12

6

2

0.66

d. Rows must be arranged in two equal groups at equal distance from the bottom on each side of thevertical centerline of the pipe. The lower-most rows of perforations must be separated by an arc of notless than 60 degrees or more than 125 degrees. The uppermost rows of perforations must be separated
by an arc not to exceed 166 degrees. The spacing of rows between these limits must be uniform. The
minimum number of rows must be as shown in table 547–1.
e. Slot perforations must be symmetrically located in two rows, one on each side of the pipe centerline.
Slot perforations must be located within the lower quadrants of the pipe with slots no wider than 1/8
inch and spaced not to exceed 11 times the perforation width. Minimum perforation opening per lineal
foot of pipe must be as shown in table 547–1.
f. On both the inside and outside of the pipe, perforations must be free of cuttings or frayed edges andof any material that would reduce the effective opening.

547–2(210–642–H, __ Ed., Amend. __ Oct 2017)

Chapter 3

National Standard Material
Specifications

Material Specification 547
Table 547–2

Part 642
National Engineering Handbook

Plastic Pipe (continued)

Pipe specification

Pipe

Specification

Poly vinyl chloride (PVC) pipe
Plastic pipe - Schedules 40, 80, 120 ....................................................................................................................ASTM D1785
ASTM D2466
Pressure rated pipe - SDR Series ........................................................................................................................AWWA C900
ASTM D2241
Plastic drain, waste, and vent pipe and fittings .................................................................................................ASTM D2665
Joints for IPS PVC pipe using solvent weld cement...........................................................................................ASTM D2672
Composite sewer pipe............................................................................................................................................ASTM D2680
Type PSM PVC sewer pipe and fittings ..............................................................................................................ASTM D3034
Large-diameter gravity sewer pipe and fittings..................................................................................................ASTM F679
Smooth-wall underdrain systems for highway, airport, and similar drainage ...........................................ASTM F758
Profile gravity sewer pipe and fittings based on controlled inside diameter...............................................ASTM F794
Corrugated sewer pipe with a smooth interior and fittings ...........................................................................ASTM F949
Pressure pipe, 4-inch through 12-inch for water distribution ...........................................................................AWWA C900
Water transmission pipe, nominal diameters 14-inch through 36-inch............................................................AWWA C905
Polyethylene (PE) plastic pipe
Schedule 40...........................................................................................................................................................ASTM D2104
12 to 60-inch annular corrugated profile-wall polyethylene (PE) pipe and fittings ....................................ASTM F2306
SIDR-PR based on controlled inside diameter....................................................................................................ASTM D2239
Schedules 40 and 80 based on outside diameter................................................................................................ASTM D2447
SDR-PR based on controlled outside diameter ..................................................................................................ASTM 3035
High-density polyethylene (HDPE) plastic pipe
Plastic pipe and fittings........................................................................................................................................ASTM D3350
SDR-PR based on controlled outside diameter ...................................................................................................ASTM F714
Heat joining polyolefin pipe and fittings .............................................................................................................ASTM D2657
Acrylonitrile-butadiene-styrene (ABS) pipe
Plastic pipe, schedules 40 and 80 .......................................................................................................................ASTM D1527
Composite sewer pipe...........................................................................................................................................ASTM D2680(210–642–H, __ Ed., Amend. __ Oct 2017)547–3

(210–642–H, __ Ed., Amend. __ Oct 2017)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 553—Ductile Iron Pipe
1. Scope
This specification covers the quality of ductile ironpipe and fittings.
2. Pipe
Ductile iron pipe shall conform to the requirementsof ANSI/AWWA C151/A21.51, Ductile Iron Pipe, Centrifugally Cast in Metal Molds or Sand Lined Molds for
Water or Other Liquids, and ANSI/AWWA C115/A21.15,
Flanged Ductile Iron Pipe with Threaded Flanges.
3. Fittings
Ductile-iron pipe fittings shall conform to the requirements of ANSI/AWWA C110/A21.10, Ductile Iron andGray Iron Fittings, 3 through 48 inch, for Water andOther Liquids, and ANSI/AWWA C153/A21.53, Ductile
Iron Compact Fittings, 3 through 12 inch, for Water
and Other Liquids.

4. Joints
Rubber-gasket joints for ductile iron pipe and fittings
where either mechanical or push-on joints are usedshall conform to the requirements of ANSI/AWWA
C111/A21.11, Rubber Gasket Joints for Ductile Ironand Gray Iron Pressure Pipe and Fittings.
5. Lining
Interior lining for ductile-iron pipe and fittings shallconform to the requirements of ANSI/AWWA C104/
A21.4, Cement Mortar Lining for Ductile Iron Pipe andFittings for Water.
6. Encasement
Encasement for ductile iron pipe and fittings shallconform to the requirements of ANSI/AWWA C105/
A21.5, Polyethylene Encasement for Ductile Iron Pipefor Water and Other Liquids.

(210–VI–NEH, January 2014)

553–1

Chapter 3

553–2

National Standard Material
Specifications(210–VI–NEH, January 2014)

Part 642
National Engineering Handbook

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 571—Slide Gates
1. Scope
This specification covers the quality of metal slide gates for water control.
2. Class and type of gate
The class of gate is expressed as a numerical symbol composed of the seating head and unseatinghead. The two numbers are separated by a hyphen with the seating head listed first. For thispurpose, the heads must be expressed in terms of feet of water. Gates must be of the specified types
as defined below:
Light dutyType MLS-1 Cast iron with cast iron seat facings
Type MLS-2 Fabricated metal
Moderate dutyType MMS-1 Cast iron with bronze seat facings, cast iron or galvanized structural steel guides, andgalvanized steel, bronze, or stainless steel fasteners.
Type MMS-2 Cast iron with bronze seat facings, cast iron or stainless steel guides, and bronze or
stainless steel fasteners. Guides and fasteners are stainless steel, when specified.
Heavy-dutyType MHS-1 Gray cast iron slides, frames, guides, and yokes, fitted with bronze seat facings, bronze
wedges and wedge blocks or wedge seat facings, and bronze stem blocks or thrust nuts, bronze or
stainless steel fasteners, and cold-rolled steel stems except where stainless steel stems are specified.
Type MHS-2 Gray cast iron slides, frame, guides, and yokes, fitted with stainless steel seat facings,
wedges, wedge seat facings, stems and fasteners and austenitic cast iron stem blocks or thrust nuts.
Type MHS-3 Austenitic gray cast iron slides, frames, guides, and yokes, fitted with nickel-copper
alloy seat facings, wedges, wedge seat facings, stems and fasteners and austenitic cast iron stem
blocks or thrust nuts.

(210–VI–NEH, Amend. 2, Sept. 2018

571–1

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

3. Quality of material
Material for slide gates and appurtenances must conform to the requirements of the applicablespecifications listed below for the alloy, grade, type, or class of material and the condition and finish
appropriate to the structural and operational requirements.

Material

ASTM specification

Cast iron and gray cast iron...............................................A48, Class 30 A126, Class B
Austenitic cast iron.............................................................A436
Structural steel shapes, plates...........................................A36 and bars
Cold rolled steel...................................................................A108
Carbon steel bars.................................................................A108 or A575
Stainless steel......................................................................A167, A276, A582; Type 302, 303, 304, or 304L
Castings, nickel and nickel alloy........................................A494
Carbon steel sheets and strips...........................................A1011
Zinc-coated carbon steel sheets..........................................A653 or A924
Bronze bar, rods, shapes.....................................................B21 or B98
Naval bronze........................................................................B21
Phosphor bronze..................................................................B103 or B139
Manganese bronze...............................................................B138 or B584
Silicon bronze.......................................................................B98 or B584
Cast bronze..........................................................................B584
Nickel-copper alloy plate, sheet..........................................B127 strip
Nickel-copper alloy rod or bar.............................................B164
Rubber for gaskets and seals..............................................D395, D412, D471, D572, or D2240

Galvanizing (zinc coating) must conform to the requirements of Material Specification 582.

4.
Fabricated metal gates (light-duty gates)
Fabricated metal gates must be built to withstand the seating head expressed by the gate classdesignation. Unless otherwise specified, the gates must be galvanized steel with flat-back frames.
5. Cast iron gates (light-duty gates)
The frame must be cast iron of the specified type. The front face must be machined to receive thegate guides.
The gate slide must be cast iron and be fabricated to withstand the seating and unseating heads
expressed by the gate class designation as defined in section 2 of this specification.
Grooves must be cast on the vertical sides of the slide to match the guide angles.
The gate guides must be galvanized structural steel and be fabricated to withstand the total thrustof the gate slide from water pressure and wedge action under maximum operating conditions.

571–2(210–VI–NEH, October 2017)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Wedges and wedge seats must have smooth bearing surfaces. Wedges may be cast as integral partsof the slide. Removable wedges and wedge seats must be fastened to the slide, frame, or guides bymeans of suitable studs, screws, or bolts and be firmly locked in place after final adjustment. Eachinteracting set of wedge and wedge seat must be adjustable as needed to ensure accurate andeffective contact. Adjusting bolts or screws must be bronze or galvanized steel.
Seat facings must be machined to a smooth finish to ensure proper watertight contact.

6. Frame or seat (moderate- and heavy-duty gates)
The frame must be cast iron and of the specified type. The front face must be machined to receive
the gates guides, and the rear face must be machined as required to match the specified attachingmeans. For heavy-duty gates, a dovetailed groove must be machined on the perimeter of the front
face to receive the seat facing.
7. Gate slide (moderate- and heavy-duty gates)
The gate slide must be cast iron, rectangular in shape, and have horizontal and vertical stiffening
ribs of sufficient section to withstand the seating and unseating heads expressed by the gate classdesignation as defined in section 2 of this specification. For heavy-duty gates, a dovetailed groovemust be machined on the perimeter of the slide face to receive the seat facing.
Tongues must be machined on the vertical sides of the slide along its entire height to match theguide grooves and angles with a maximum clearance of 1/16 inch for gates smaller than 54 inches
by 54 inches, and 1/8 inch for larger gates.
A nut pocket with reinforcing ribs must be integrally cast on the vertical centerline and above thehorizontal centerline of the slide. The pocket must be of a shape adequate to receive a flat-backed
thrust nut or stem block and be built to withstand the opening and closing thrust of the stem.

8. Gate guides (moderate- and heavy-duty gates)
The gate guides must be built to withstand the total thrust of the gate slide from water pressure
and wedge action. The gate guides must be cast iron for heavy-duty gates.
Grooves must be machined-in cast iron guides to receive the tongue on the gate slide throughout theentire length of the guide.
The guides must be of adequate length to retain a minimum of one-half the height of the gate slide
when the gate is fully opened.

9. Wedges and wedge seats (moderate- and heavy-duty gates)
Pads for supporting wedges, wedge seats (or blocks), and wedge loops (or stirrups) must be cast as
integral parts of the gate frame, slide, or guides and be accurately machined to receive those parts.
Wedges and wedge seats must have smooth bearing surfaces for moderate-duty gates and havemachine finish bearing surfaces for heavy-duty gates. Removable wedges may be cast as integral
parts of the slide for moderate-duty gates. Wedges must be fastened to the gate slide, frame, or
guides with suitable studs, screws, or bolts and be firmly locked in place after final adjustment.
Each interacting set of wedge and wedge seat must be adjustable as needed to ensure accurate andeffective contact.
10. Seat facing
Moderate-duty gates—Seat facings must be machined to a smooth finish to ensure proper(210–VI–NEH, Amend. 2, Sept. 2018

571–3

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

watertight contact. Bronze facings must be securely attached by welding or other approved
methods.

Heavy-duty gates—Seat facings must be pressed or impacted into the machined dovetailed grooves
on the gate slide and frame and machined to a smooth finish to ensure proper watertight contact.
11. Yoke
When a self-contained gate is specified, the yoke must be of such design as to withstand the loads
resulting from normal operation of the gate. For moderate- and heavy-duty gates, cast iron yokesmust be provided with machined pads for connecting to the ends of gate guides and to receive thestem thrust cap or hand-wheel lift.
12. Flush bottom seal (heavy-duty gate)
When a flush bottom sealing gate is specified, a solid, square-corner type rubber seal must be
provided at the bottom of the gate opening. It must be securely attached either to the bottom of theslide or to the frame. Metal surfaces bearing on the rubber seal must be smooth and rounded asnecessary to prevent damage to the seal during gate operation.
13. Gate stem and lift (or hoist)
The gate stem and lift or hoist must be of the specified type, size, and capacity. If hand operated, it
must be capable of moving the gate slide under normal conditions with the specified seating and/or
unseating head of water against the gate, following unseating from the wedging device, with a pullon the hand-wheel or crank of not more than 25 pounds.
Unless otherwise specified, the stem must be carbon steel and be furnished in sections as necessary
to permit reasonable ease of installation. Couplings must be bolted, pinned, or keyed to the stem.
The stem must be furnished with rolled or machine-cut 29-degree Acme threads of sufficient length
to completely open the gate. The threads must be smooth and of uniform lead and cross-section,such that the nut can travel the full length without binding or excessive friction. For moderate- andheavy-duty gates, the stem must be threaded for connection to the stem block or thrust nut on thegate slide.
The lift must be compatible with the type of stem furnished. Unless otherwise specified, the lift nut
must be cast bronze for light- and moderate-duty gates and cast manganese bronze for heavy-duty
gates and be fitted with ball or roller thrust bearings designed to withstand the normal thrustdeveloped during opening and closing of the gate at the maximum operating heads. All gears,
sprockets, and pinions must be machine-cut, with ratios and strength adequate to withstandexpected operating loads. Sufficient grease fittings must be provided to allow lubrication of all
moving parts. An arrow and the word "open" must be cast on the rim of the hand-wheel or on the lift
housing to indicate the direction of gate opening. Unless otherwise specified, the lift for the
nonrising-stem gate must be provided with an indicator capable of showing both when the gate is
fully open and when it is fully closed for the moderate- and heavy-duty gates.
Provisions must be made to prevent stem rotation within the stem block or thrust nut or at theconnection of the gate slide.
Stop collars must be provided to prevent over-travel in opening and closing the gate.

14. Stem guides

571–4(210–VI–NEH, October 2017)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Unless otherwise specified, stem guides must be cast iron for light-duty gates and cast iron withbronze bushed collars for moderate- and heavy-duty gates. They must be fully adjustable in two
directions.

15. Wall thimble (moderate- and heavy-duty gates)
When a wall thimble is specified, it must be of the same cast iron used in the gate frame and of thesection, type, and depth specified. The front flange must be machined to match the gate frame anddrilled and tapped to accurately receive the gate attachment studs.
Gaskets or mastic to be installed between the thimble and the gate frame must conform to therecommendations of the gate manufacturer and be furnished with the thimble.

16. Fasteners
Unless otherwise specified, all anchor bolts and other fasteners must be galvanized steel or bronze
for light-duty gates, galvanized steel or stainless steel or bronze for moderate-duty gates, and of thequality and size recommended by the gate manufacturer for heavy-duty gates. All anchor bolts,
assembly bolts, screws, nuts, and other fasteners must be of ample section to withstand the forces
created by operation of the gate while subjected to the specified seating and unseating heads.
Anchor bolts must be furnished with two nuts to facilitate installation.
17. Installation instructions
Before installation, provide the engineer with the manufacturer's complete installation data,
instructions for adjustments, and drawings or templates showing the location of all anchor bolts foreach gate.
18. Painting
When specified, gates and accessories must be painted by the designated paint system.
19. Certification
The supporting data submitted to the engineer must include the name of the manufacturer, themanufacturer's model number (for standard catalogue items), or the seating and unseating heads
for which the gate is designed. Include any drawings and specifications necessary to show that thegate conforms to the requirements of this specification.

(210–VI–NEH, Amend. 2, Sept. 2018

571–5

Chapter 3

571–6

National Standard Material
Specifications(210–VI–NEH, October 2017)

Part 642
National Engineering Handbook

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 581—Metal
1. Scope
This specification covers the quality of steel and aluminum alloys.
2.

Structural steel• Structural steel shall conform to the requirements of ASTM A 36.
• High-strength low-alloy structural steel shallconform to ASTM A 242 or A 588.
• Carbon steel plates of structural quality to bebent, formed, or shaped cold shall conform the
ASTM A 283, Grade C.
• Carbon steel sheets of structural quality shallconform to ASTM Standard A 1011, Grade 40,
or A 1008, Grade 40.
• Carbon steel strip of structural quality shallconform to ASTM Standard A 1011, Grade 36.

3. Commercial or merchant quality steel
Commercial or merchant quality steel shall conform to
the requirements of the applicable ASTM listed below:
Product

ASTM standards

Carbon steel bars........................... A 575, Grade M 1015
to Grade M 1031
Carbon steel sheets............................................... A 1011
Carbon steel strips................................................. A 1011
Zinc-coated carbon steel sheets.............A 653 or A 924

4. Aluminum alloy
Aluminum alloy products shall conform to the requirements of the applicable ASTM standard listed below.
Unless otherwise specified, alloy 6061-T6 shall be
used.
Product

5. Bolts
Steel bolts shall conform to the requirements of ASTM
Standard A 307. If high-strength bolts are specified,they shall conform to the requirements of ASTM A 325.
When galvanized or zinc-coated bolts are specified,the zinc coating shall conform to the requirements of
ASTM Standard A 153 except that bolts 0.5 inch or lessin diameter may be coated with electro-deposited zincor cadmium coating conforming to the requirementsof ASTM Standard B 633, Service Condition SC 3, or
ASTM B 766, unless otherwise specified.

6. Rivets
Unless otherwise specified, steel rivets shall conformto the requirements of ASTM Specification A 31, Grade
B. Unless otherwise specified, aluminum alloy rivets
shall be Alloy 6061 conforming to the requirements of
ASTM Standard B 316.
7. Welding electrodes
Steel welding electrodes shall conform to the requirements of American Welding Society Specification AWS
A5.1, "Specification for Mild Steel Covered Arc-Welding Electrodes," except that they shall be uniformly
and heavily coated (not washed) and shall be of sucha nature that the coating does not chip or peel while
being used with the maximum amperage specified by
the manufacturer.
Aluminum welding electrodes shall conform to therequirements of American Welding Society Specification AWS A5.10, "Specification for Aluminum andAluminum-Alloy Welding Rods and Bare Electrodes."ASTM standards

Standard structural shape...................................... B 308
Extruded structural pipe and tube........................ B 429
Extruded bars, rods, shapes, and tubes................ B 221
Drawn seamless tubes............................................ B 210
Rolled or cold-finished bars, rods, and wire ....... B 211
Sheet and plate......................................................... B 209(210–VI–NEH, November 2005)

581–1

(210–VI–NEH, November 2005)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 582—Galvanizing
1. Scope
This specification covers the quality of zinc coatings
applied to iron and steel productions.
2. Quality
Zinc coatings shall conform to the requirements of
ASTM A 123 for Zinc (Hot-Dip Galvanized) Coatings
on Iron and Steel Products or as otherwise specified
in the items of work and construction details of theConstruction Specification.
ASTM A 123 covers both fabricated and nonfabricatedproducts; e.g., assembled steel products, structuralsteel fabrications, large tubes already bent or welded

before galvanizing, and wire work fabricated fromnoncoated steel wire. It also covers steel forgings
and iron castings incorporated into pieces fabricatedbefore galvanizing or which are too large to be centrifuged (or otherwise handled to remove excess galvanizing bath metal).
Items to be centrifuged or otherwise handled toremove excess zinc shall meet the requirements of
ASTM A 153, except bolts, screws, and other fasteners 0.5 inch or less in diameter may be coated withelectro-deposited zinc or cadmium coating conforming
to the requirements of ASTM B 766, coating thickness
Class 5, Type III, or ASTM B 633, Service Condition
SC-3, unless otherwise specified.

(210–VI–NEH, May 2001)

582–1

(210–VI–NEH, May 2001)

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 591—Field Fencing Material
1. Scope
This specification provides the minimum quality requirements for the material used in theconstruction of field fences.
2. Wire gauge
When the size of steel wire is designated by gage number, the diameter must be as defined for
U.S. Steel Wire Gauge.
3. Fencing
Fencing material must conform to the requirements of ASTM A121 for barbed wire, ASTM A16
for woven wire, ASTM A390 for poultry fence or netting, and ASTM A854 for high-tensile wire1.
Barbed wire and woven wire must be class-3 zinc coated as specified in ASTM A641 unlessotherwise specified. High-tensile wire must have type-I zinc coating unless otherwise specified.
4. Stays, fasteners, and tension wire
Stays and fasteners must conform to the requirements of the specified ASTM for the fencing
material. Tension wires must have a tensile strength not less than 58,000 pounds per squareinch. Stays, fasteners, and tension wire must have class-3 zinc coating as specified in ASTM
A641 unless otherwise specified.
5. Wood fence posts and braces
Unless otherwise specified, wood posts must be naturally rot resistant, preservative-treated, orother wood of equal life and strength. At least half the diameter or diagonal dimension ofnaturally rot resistant posts must be in heartwood. Provide new wood posts that are sound, freefrom decay with all limbs trimmed substantially flush with the body. All posts must be
substantially straight throughout their full length.
Make tops convex rounded or inclined. Provide posts free of ring shake, season cracks morethan ¼-inch wide, splits in the end, and unsound knots. Pine must be pressure treated inconformance with Material Specification 585, Wood Preservatives and Treatment. Wood braces
must be of wood material equal to or better than construction grade Douglas fir. Wood braces
must be pressure treated in conformance with Material Specification 585.

6. Steel fence posts and braces
Steel fence posts must conform to the requirements of ASTM A702. Posts with punched tabs forfastening the wires must not be installed. Bracing pipes must conform to the requirements of
ASTM A53 except that the A53 requirements for hydrostatic test will not apply.
7. Concrete fence posts
Concrete fence posts must be manufactured to the specified requirements of size, shape, andstrength.
8. Panel gates
Panel gates must be the specified types, sizes, and quality and include the necessary fittingsrequired for installation. Gates must be of rigid construction free from sag or twist. The fittingsmust consist of not less than two hinges and one latch or galvanized chain for fastening.
Latches must be of such design that a padlock may be used for locking. All fittings must be ofequal or greater quality than the gate manufacturer's standard.

(210–642–H, Amend.2, Sept. 2018)

591–1

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

9. Wire gates
Wire gates must be the type shown on the drawings, constructed in accordance withspecifications, at the locations, and to the dimensions shown on the drawings. The materialmust conform to the kinds, grades, and sizes specified for new fence, and must include thenecessary fittings and stays.
10. Staples
Staples required to secure the fence wire to wood posts must be 9-gauge galvanized wire with aminimum length of 1.5 inches for soft woods and a minimum length of 1 inch for close-grain
hardwoods.
11. Galvanizing
All iron and steel fencing material, except as otherwise specified, must be zinc coated by the hot
dip process meeting the requirements of Material Specification 582. Clips, bolts, and othersmall hardware must be protected by hot-dipped galvanizing, electro-deposited zinc, or
cadmium coating.

(210–642–H, Amend.2, Sept. 2018)

591–2

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 592—Geotextile
1. Scope
This specification covers the quality of geotextile, including geotextile for temporary silt fence.
2. General Requirements
Fiber (thread and yarn) used in the manufacture of geotextile must consist of synthetic polymer composedof a minimum of 85 percent by weight polypropylene, polyester, polyamide, polyethylene, polyolefin, or
polyvinylchloride. The fiber must be formed into a stable network of filaments retaining dimensional
stability relative to each other. The geotextile must be free of defects such as holes, tears, and abrasions.
The geotextile must be free of any chemical treatment or coating that significantly reduces its porosity.
Fibers must contain stabilizers, inhibitors, or both to enhance resistance to ultraviolet light. Geotextile,other than that used for temporary silt fence, must conform to the requirements in tables 592–1 or 592–2,
as applicable. Geotextile used for temporary silt fence must conform to ASTM D6461.
Thread used for factory or field sewing must be of a color contrasting to the color of the fabric and made ofhigh-strength polypropylene, polyester, or polyamide material. It must be as resistant to ultraviolet light as
the geotextile being sewn.

3. Classification
There are two geotextile classifications, woven and nonwoven. Geotextile for temporary silt fence may beeither woven or nonwoven. Slit film woven geotextile may not be used except for temporary silt fence.
Woven geotextiles are made from fabric that is formed by the uniform and regular interweaving of thethreads or yarns in two directions. Woven fabrics must be manufactured from monofilament yarn formed
into a uniform pattern with distinct and measurable openings, retaining their position relative to eachother. The fabric must have a selvedge edge or otherwise be finished to prevent unraveling.
Nonwoven geotextiles are made from fabric that is formed by a random placement of threads in a mat andbonded by needle punching, heat bonding, or resin bonding. Nonwoven geotextile must have distinct but
variable small openings, retaining their position relative to each other when bonded. The use of heat- or
resin-bonded nonwovens is restricted as specified in note 2 of table 592-2.

4. Sampling and Testing
The geotextile must conform to tables 592–1, 592–2, or ASTM D6461 as applicable for the product typeshown on the label. Documentation described in either a. or b. below is required to verify the product meetsthe specified requirements:
a. Product properties as listed in the latest edition of the "Specifiers Guide," Geosynthetics (Industrial
Fabrics Association International, 1801 County Road B, West Roseville, MN 55113-4061 or at
http://www.geosindex.com), and that represent average roll values, are acceptable.
b. Test data from the geotextile production run for each of the specified tests listed in tables 592–1, 592–
2, or ASTM D6461, as applicable.
5. Shipping and Storage
Each roll of geotextile must be labeled or tagged to clearly identify the brand, class, and the individual
production run in accordance with ASTM D4873. The geotextile must be shipped and transported in rolls
wrapped with a cover for protection from moisture, dust, dirt, debris, and ultraviolet light. The cover must be
maintained undisturbed to the maximum extent possible before placement.

(210–642–H, Amend.2,
Sept. 2018)
(

592–1

National Standard Material
Specifications

Chapter 3

Material Specification 592
Table 592–1

Part 642
National Engineering Handbook

Geotextile (continued)

Requirements for woven geotextiles 1/

Property

Test method

Class IClass IIClass IIIClass IV

Grab tensile strength(lb)

ASTM D4632

247 minimum

180 minimum

180 minimum

315

Elongation at failure(%)

ASTM D4632

<50

<50

<50

<50

Trapezoidal tearstrength (lb)

ASTM D4533

90 minimum

67 minimum

67 minimum

112 minimum

Puncture strength(lb)

ASTM D6241

495 minimum

371 minimum

371 minimum

618 minimum

Ultraviolet stability(% retained strength)

ASTM D4355

50 minimum

50 minimum

50 minimum

70 minimum

Permittivity (sec–1)

ASTM D4491

as specified

Apparent opening
size (AOS) 2/

ASTM D4751

as specified

Percent open area
(POA) (%)

USACE

as specified

1/
2/
3/

3/CWO-02215-86

All values are minimum average roll values (MARV) in the weakest principal direction, unless otherwise noted.
Maximum average roll value.
Note: CWO is a USACE reference.

(210–642–H, Amend.2, Sept. 2018)

National Standard Material
Specifications

Chapter 3

Material Specification 592
Table 592–2

Part 642
National Engineering Handbook

Geotextile (continued)

Requirements for nonwoven geotextiles 1/

Property

Test method

Class I 2/

Class II 2/

Class III 2/

Class IV 2/

Grab tensile strength(lb)

ASTM D4632
grab test

202 minimum

157 minimum

112 minimum

202 minimum

Elongation at
failure (%)

ASTM D4632

50 minimum

50 minimum

50 minimum

50 minimum

Trapezoidal tearstrength (lb)

ASTM D4533

79 minimum

56 minimum

40 minimum

79 minimum

Puncture strength (lb) ASTM D6241

433 minimum

309 minimum

223 minimum

433 minimum

Ultraviolet light
ASTM D4355(retained strength) (%)

50 minimum

50 minimum

50 minimum

50 minimum

Permittivity sec–1

ASTM D4491

0.70 minimum or as specified

Apparent opening
size (AOS) (mm) 3/

ASTM D4751

0.22 maximum or as specified

1/
2/
3/

All values are minimum average roll values (MARV) in the weakest principal direction, unless otherwise noted.
Needle punched geotextiles may be used for all classes. Heat-bonded or resin-bonded geotextiles may be used for class IV only.
Maximum average roll value.

(210–642–H, Amend.2,
Sept. 2018)
(

592–3

Chapter 3

National Standard Material
Specifications(210–642–H, Amend.2, Sept. 2018)

Part 642
National Engineering Handbook

Chapter 3

National Standard Material
Specifications

Part 642
National Engineering Handbook

Material Specification 593—Lime
1. Scope
This material specification covers the quality of hydrated lime used in the treatment of clayey soils.
2. Quality
Hydrated lime—Hydrated lime shall meet the following requirements when tested in accordance withASTM C25 or AASHTO T 219:
• Minimum available lime, reported as
Ca(OH)2 = 90 percent.
• Maximum carbon dioxide (as-received
basis) = 7 percent.
The physical gradation of hydrated lime when tested
in accordance with ASTM C110 shall meet the requirements of ASTM C977.

(210–VI–NEH, November 2005)

593–1

Chapter 3

593–2

National Standard Material
Specifications(210–VI–NEH, November 2005)

Part 642
National Engineering Handbook

IFB No. PCCD-22-PCW21Rehab-01

PART VI - Divider SheetPART VI

PREVAILING WAGE RATESDETERMINATIONPer PART III – Supplemental Conditions
Article 8 – Wages / Benefits

IFB No. PCCD-22-PCW21Rehab-01

PART VI - Page 1 of 1

PART VI
PREVAILING WAGE RATES DETERMINATION[Per PART III – Supplemental Conditions, Article 8 – Wages / Benefits]
Heavy & Highway Construction (includes Hays County, Texas)
Occupation

Rate

Cement Mason/Concrete Finisher(Paving and Structures)$12.56

Electrician

Occupation

Rate

POWER EQUIPMENT OPERATOR
Front End Loader, 3 CY or less$13.04

26.35

Front End Loader, over 3 CY

13.21

Form Builder/Setter (Paving & Curb)

12.94

Loader / Backhoe

14.12

Form Builder/Setter (Structures)

12.87

Mechanic

17.10

Laborer: Asphalt Raker

12.12

Milling Machine

14.18

Laborer: Flagger* 9.45Motor Grader, Fine Grade

18.51

Laborer: Common*10.50Motor Grader, Rough

14.63

Laborer: Utility

12.27

Pavement Marking Machine

19.17

Laborer: Pipelayer

12.79

Reclaimer / Pulverizer

12.88

Laborer: Work Zone Barricade Servicer

11.85

Roller, Asphalt

12.78

Painter (Structures)

18.34

Roller, Other*10.50

Scraper

12.27

POWER EQUIPMENT OPERATOR
Agricultural Tractor

12.69

Spreader Box

14.04

Asphalt Distributor

15.55

Trenching Machine, Heavy

18.48

Asphalt Paving Machine

14.36

Servicer

14.51

Boom Truck

18.36

STEEL WORKER

Broom or Sweeper* 11.04

Reinforcing

14.00

Concrete Pavement Finishing Machine

15.48

Structural

19.29

Crane, Hydraulic 80 tons or less

18.36

TRAFFIC SIGNAL INSTALLER

Crane, Lattice Boom 80 tons or less

15.87

Traffic Signal/Light Pole Worker

Crane, Lattice Boom over 80 tons

19.38

TRUCK DRIVER

Crawler Tractor

15.67

Lowboy-Float

15.66

Directional Drilling Locator

11.67

Off Road Hauler

11.88

Directional Drilling Operator

17.24

Single Axle

11.79

Excavator 50,000 lbs. or less

12.88

Single or Tandem Axel Dump Truck

11.68

Excavator over 50,000 lbs.

17.71

Tandem Axel Trailer w/Semi Trailer

12.81

Foundation Drill, Truck Mounted

16.93

Welder

15.97

Notes:* Per Executive Order 13658, hourly minimum wage for calendar year 2022 is $11.25 per hour.
Welders receive rate prescribed for craft performing operation to which welding is incidental.

16.00