A22_Solicitation_W912EE22B0002_Mat_Casting.pdf

SOLICITATION NO. W912EE22B0002

DATE: 08 MARCH 2022

SPECIFICATIONS

FOR

DELTA, LOUISIANA, MADISION PARISH, LOUISIANA,

RM 438.0-R A.H.P, FC/MR&T, CHANNEL IMPROVEMENT,

ARTICULATED CONCRETE MATTRESS CASTING, FY-22

THIS PROCUREMENT IS UNRSTRICTED

Building Strong®

Serving the Army Serving the Nation

VICKSBURG DISTRICT

4155 CLAY STREET

VICKSBURG, MS 39183-3435 CEMVK-EC-TC

INQUIRIES

REGARDING THIS SOLICITATION SHOULD BE MADE TO THE

FOLLOWING:

http://www.projnet.org/projnet

PLANS AND SPECIFICATIONS WILL BE AVAILABLE

ON THE SYSTEM OF AWARD MANAGEMENT (SAM) WEB PAGE AT:

https://www.sam.gov

PROJECT TABLE OF CONTENTS

SECTION A – COVER SHEET AND SOLICITATION, OFFER, AND AWARD (SF 33)

SECTION B – BIDDING SCHEDULE AND SPECIAL NOTES

SECTION C1 – DESCRIPTION/SPECIFICATIONS

SECTION C2 (A) – STORM WATER POLLUTION PREVENTION PLAN FOR ALTERNATIVES A and B

SECTION C2 (B) – STORM WATER POLLUTION PREVENTION PLAN FOR ALTERNATIVE B,

CASTING AT RICHARDSON LANDING, TN

SECTION E – INSPECTION AND ACCEPTANCE

SECTION F – DELIVERIES AND PERFORMANCE

SECTION G – CONTRACT ADMINISTRATIVE DATA

SECTION H1 – SPECIAL CONTRACT REQUIREMENTS

SECTION H2 – RESIDENT MANAGEMENT SYSTEM CONTRACTOR MODE (RMS CM)

SECTION I – CONTRACT CLAUSES

SECTION J – ATTACHMENTS

SECTION K – REPRESENTATIONS, CERTIFICATIONS, AND OTHER STATEMENTS OF OFFERORS

SECTION L – INSTRUCTIONS AND CONDITIONS

SECTION M – EVALUATION FACTORS FOR AWARD

-- End of Project Table of Contents –

CODE

(Hour)

PAGE(S)

until local time

X

A X B X C

D

EX

X G F 279 - 291

292 - 310 X H 311 - 312

RATING PAGE OF PAGES

7. ISSUED BY

(Date)

IMPORTANT - Award will be made on this Form, or on Standard Form 26, or by other authorized official written notice.

Previous Edition is Unusable 33-134 STANDARD FORM 33 (REV. 9-97)

Prescribed by GSA FAR (48 CFR) 53.214(c)

4 312

(If other than Item 7)

15A. NAME 16. NAME AND TITLE OF PERSON AUTHORIZED TO

AND

ADDRESS

SIGN OFFER (Type or print)

OF

OFFEROR

AMENDMENT NO. DATE

15B. TELEPHONE NO (Include area code) 17. SIGNATURE15C. CHECK IF REMITTANCE ADDRESS

IS DIFFERENT FROM ABOVE - ENTER

SUCH ADDRESS IN SCHEDULE.

18. OFFER DATE

1. THIS CONTRACT IS A RATED ORDER

UNDER DPAS (15 CFR 700)

2. CONTRACT NO.

W912EE 8. ADDRESS OFFER TO

See Item 7

9. Sealed offers in original and copies for furnishing the supplies or services in the Schedule will be received at the place specified in Item 8, or if handcarried, in the depository located in

CAUTION - LATE Submissions, Modifications, and Withdrawals: See Section L, Provision No. 52.214-7 or 52.215-1. All offers are subject to all terms and conditions contained in this solicitation.

10. FOR INFORMATION

CALL:

A. NAME (NO COLLECT CALLS)

11. TABLE OF CONTENTS

SOLICITATION/ CONTRACT FORM

SUPPLIES OR SERVICES AND PRICES/ COSTS

5 - 13

X I CONTRACT CLAUSES

DESCRIPTION/ SPECS./ WORK STATEMENT X

PACKAGING AND MARKING

14 - 49 J LIST OF ATTACHMENTS

INSPECTION AND ACCEPTANCE

DELIVERIES OR PERFORMANCE

50 - 60 61 - 67

X K

REPRESENTATIONS, CERTIFICATIONS AND

OTHER STATEMENTS OF OFFERORS

CONTRACT ADMINISTRATION DATA 68 - 71 X

SPECIAL CONTRACT REQUIREMENTS

OFFER (Must be fully completed by offeror) 72 - 107 X M

L INSTRS., CONDS., AND NOTICES TO OFFERORS

EVALUATION FACTORS FOR AWARD

NOTE: Item 12 does not apply if the solicitation includes the provisions at 52.214-16, Minimum Bid Acceptance Period.

is inserted by the offeror) from the date for receipt of offers specified above, to furnish any or all items upon which prices are offered at the price set opposite each item, delivered at the designated point(s), within the time specified in the schedule.

13. DISCOUNT FOR PROMPT PAYMENT

(See Section I, Clause No. 52.232-8)

14. ACKNOWLEDGMENT OF AMENDMENTS

(The offeror acknowledges receipt of amendments

AMENDMENT NO. DATE

to the SOLICITATION for offerors and related documents numbered and dated):

FACILITY

12. In compliance with the above, the undersigned agrees, if this offer is accepted within calendar days (60 calendar days unless a different period

SOLICITATION, OFFER AND AWARD

X

(X) SEC. DESCRIPTION (X) SEC. DESCRIPTION PAGE(S)

PART I - THE SCHEDULE

26. NAME OF CONTRACTING OFFICER (Type or print) 27. UNITED STATES OF AMERICA 28. AWARD DATE

EMAIL:TEL: (Signature of Contracting Officer)

CODE CODE

B. TELEPHONE (Include area code) C. E-MAIL ADDRESS

AWARD (To be completed by Government)

19. ACCEPTED AS TO ITEMS NUMBERED 20. AMOUNT 21. ACCOUNTING AND APPROPRIATION

22. AUTHORITY FOR USING OTHER THAN FULL AND OPEN COMPETITION:

10 U.S.C. 2304(c)( ) 41 U.S.C. 253(c)( ) (4 copies unless otherwise specified)

23. SUBMIT INVOICES TO ADDRESS SHOWN IN ITEM

24. ADMINISTERED BY (If other than Item 7) CODE 25. PAYMENT WILL BE MADE BY CODE

PART IV - REPRESENTATIONS AND INSTRUCTIONS

PART III - LIST OF DOCUMENTS, EXHIBITS AND OTHER ATTACHMENTS

108 - 241

PART II - CONTRACT CLAUSES

VICKSBURG CONTRACTING OFFICE

4155 CLAY ST

VICKSBURG MS 39183-3435

601-631-

601-631-7261FAX:

TEL:

FAX:

TEL:

NOTE: In sealed bid solicitations "offer" and "offeror" mean "bid" and "bidder".

SOLICITATION

242-278

6. REQUISITION/PURCHASE NO.5. DATE ISSUED

08 Mar 2022

4. TYPE OF SOLICITATION

SEALED BID (IFB)

NEGOTIATED (RFP)

[ X ]

3. SOLICITATION NO.

W912EE22B0002

W807PM13507358

US ARMY CORPS OF ENGINEERS FINANCE CENTER

5722 INTEGRITY DRIVE

MILLINGTON TN 38054-5005

Suite 120 (or 103 up to 15 minutes prior to bid opening) 02:00 PM 07-APR-2022

FRETESHIA L JOHNSON 601-631-5219 Freteshia.L.Johnson@usace.army.mil

W912EE22B0002

Section B - Supplies or Services and Prices

SECTION B

SUPPLIES OR SERVICES AND PRICES/COSTS

BID SCHEDULE

ALTERNATIVE A: CASTING AT DELTA, LA

ITEM DESCRIPTION EST QTY U/M U/PRICE EST AMOUNT

BASE WORK

0001 Articulated Concrete Mattress

001A Casting Mattress (exclusive of cement, 50,000 SQ $__________ $____________ and fly ash), using Portland Cement, fly ash, and water- reducing admixture

001B Portland Cement 121,750 CWT $__________ $____________

001C Fly Ash 22,500 CF $__________ $____________

001D Metal Chairs 200,000 EA $__________ $____________

Total Base Work: $________________________

Option 1

0002 Articulated Concrete Mattress 002A Casting Mattress (exclusive of cement, 10,000 SQ $_________ $_____________ and fly ash), using Portland Cement, fly ash, and water- reducing admixture

002B Portland Cement 24,350 CWT $_________ $_____________

002C Fly Ash 4,500 CF $_________ $_____________

002D Metal Chairs 40,000 EA $_________ $_____________

Total Option 1: $________________________

SECTION B

SUPPLIES OR SERVICES AND PRICES/COSTS

BID SCHEDULE

ALTERNATIVE A: CASTING AT DELTA, LA continued…

ITEM DESCRIPTION EST QTY U/M U/PRICE EST AMOUNT

Option 2

0003 Articulated Concrete Mattress 003A Casting Mattress (exclusive of cement, 10,000 SQ $_________ $___________ and fly ash), using Portland Cement, fly ash, and water- reducing admixture

003B Portland Cement 24,350 CWT $_________ $___________

003C Fly Ash 4,500 CF $_________ $___________

003D Metal Chairs 40,000 EA $_________ $___________

Total Option 2: $______________________

Option 3

0004 Articulated Concrete Mattress 004A Casting Mattress (exclusive of cement, 5,000 SQ $_________ $____________ and fly ash), using Portland Cement, fly ash, and water- reducing admixture

004B Portland Cement 12,175 CWT $_________ $____________

004C Fly Ash 2,250 CF $_________ $____________

004D Metal Chairs 20,000 EA $_________ $____________

Total Option 3: $_______________________

SECTION B

SUPPLIES OR SERVICES AND PRICES/COSTS

BID SCHEDULE

ALTERNATIVE A: CASTING AT DELTA, LA continued…

ITEM DESCRIPTION EST QTY U/M U/PRICE EST AMOUNT

Option 4

0005 Articulated Concrete Mattress 005A Casting Mattress (exclusive of cement, 5,000 SQ $__________ $____________ and fly ash), using Portland Cement, fly ash, and water- reducing admixture

005B Portland Cement 12,175 CWT $__________ $____________

005C Fly Ash 2,250 CF $__________ $____________

005D Metal Chairs 20,000 EA $__________ $____________

Total Option 4: $________________________

Alternative A, CASTING AT DELTA, LA TOTAL OF BASE BID Plus Options 1, 2, 3, & 4: $______________________________

SECTION B

SUPPLIES OR SERVICES AND PRICES/COSTS

BID SCHEDULE

ALTERNATIVE B: CASTING AT RICHARDSON LANDING, TN

ITEM DESCRIPTION EST QTY U/M U/PRICE EST AMOUNT

BASE WORK

0001 Articulated Concrete Mattress 001A Casting Mattress (exclusive of cement, 50,000 SQ $__________ $_____________ and fly ash), using Portland Cement, fly ash, and water- reducing admixture

001B Portland Cement CWT $__________ $_____________

001C Fly Ash CF $__________ $_____________

001D Metal Chairs

121,750

22,500

200,000 EA $__________ $_____________

Total Base Work: $_________________________

Option 1

0002 Articulated Concrete Mattress 002A Casting Mattress (exclusive of cement, 10,000 SQ $___________ $_____________ and fly ash), using Portland Cement, fly ash, and water- reducing admixture

002B Portland Cement 24,350 CWT $___________ $______________

002C Fly Ash 4,500 CF $___________ $______________

002D Metal Chairs 40,000 EA $___________ $______________

Total Option 1: $___________________________

SECTION B

SUPPLIES OR SERVICES AND PRICES/COSTS

BID SCHEDULE

ALTERNATIVE B: CASTING AT RICHARDSON LANDING, TN continued…

ITEM DESCRIPTION EST QTY U/M U/PRICE EST AMOUNT

Option 2

0003 Articulated Concrete Mattress 003A Casting Mattress (exclusive of cement, 10,000 SQ $_________ $____________ and fly ash), using Portland Cement, fly ash, and water- reducing admixture

003B Portland Cement 24,350 CWT $_________ $____________

003C Fly Ash 4,500 CF $_________ $____________

003D Metal Chairs 40,000 EA $_________ $____________

Total Option 2: $_______________________

Option 3

0004 Articulated Concrete Mattress 004A Casting Mattress (exclusive of cement, 5,000 SQ $__________ $_____________

004B Portland Cement 12,175 CWT $_________ $_____________

004C Fly Ash 2,250 CF $_________ $_____________

004D Metal Chairs 20,000 EA $_________ $_____________

Total Option 3: $________________________

SECTION B

SUPPLIES OR SERVICES AND PRICES/COSTS

BID SCHEDULE

ALTERNATIVE B: CASTING AT RICHARDSON LANDING, TN continued…

ITEM DESCRIPTION EST QTY U/M U/PRICE EST AMOUNT

Option 4

0005 Articulated Concrete Mattress 005A Casting Mattress (exclusive of cement, 5,000 SQ $_________ $______________

005B Portland Cement 12,175 CWT $_________ $______________

005C Fly Ash 2,250 CF $_________ $______________

005D Metal Chairs 20,000 EA $_________ $______________

Total Option 4: $_________________________

Alternative B, CASTING at RICHARDSON LANDING, TN TOTAL OF BASE BID Plus Options 1, 2, 3, & 4: $_______________________________

Special Notes to the Contractor: THIS PROCUREMENT IS UNRESTRICTED.

NOTE 1: The bidder is required to bid on all line items on EITHER Alternative A, Casting at Delta, LA, OR Alternative B, Casting at Richardson Landing, TN. Failure to submit a bid on all line items on one of the alternatives shall result in a non-responsive bid, requiring rejection thereof. In the event that a bidder is willing to waive costs associated with the individual line item, he/she is required to insert descriptive words or abbreviations such as "no charge" or "N.C.". Award will be based upon the lowest responsible, reasonable bid regardless of the alternative bid. See note below regarding evaluation of options.

NOTE 2: END ITEMS. For small business concern representative purposes, the end item being procured under this solicitation are completed squares of articulated concrete mattress. Ingredients such as Portland Cement and Fly Ash, etc., are not end items.

NOTE 3: Cement and Fly Ash quantities are based on theoretical quantities and will be used to evaluate bids. Actual amounts will depend on the various mix designs furnished by the Government during the contract performance period. Fly Ash may vary from 0 to 35 percent of total cementitious materials as directed by the Government.

NOTE 4: SITE VISITS. For site visit information see Section L – INSTRUCTIONS, CONDITIONS AND NOTICES TO OFFERORS, paragraph entitled "SITE VISIT".

NOTE 5: For variation in quantity clause see Section F – DELIVERIES OR PERFORMANCE, paragraph entitled "VARIATION IN QUANTITY

(FAR 52.211-16 - APR 1984)".

NOTE 6: OPTIONAL WORK ITEMS. The Government may require the delivery of the numbered line item(s), identified in the schedule as OPTIONAL WORK Items, in the quantities and prices stated in the schedule. The Contracting Officer may exercise the OPTION WORK Items by written notice to the Contractor. Option 1 and/or 2 can be exercised and awarded by the Contracting Officer up until August 1, 2022. Option 3 and/or 4 can be exercised and awarded by the Contracting Officer up until September 1, 2022. Options are not required to be awarded in consecutive order. The Contracting Officer may elect not to award any options or may award any combination of options at his discretion. Bidders shall bid on all items including optional items (see “EVALUATION OF OPTIONS” FAR 52.217-5). Failure to bid on all items will result in a non-responsive bid.

NOTE 7: EVALUATION OF OPTIONS (FAR 52.217-5 - JUL 1990). The Government will evaluate offers for award purposes by adding the total price for all options to the total price for this basic requirement. Evaluation of options will not obligate the Government to exercise the option(s).

NOTE 8: Bid Items 0001B, 0001C, 0002B, 0002C, 0003B, 0003C, 0004B, 0004C, 0005B, and 0005C are estimated quantities only. (See Note 3 above.) Actual pay quantities will be the theoretical quantities based on government mix design and the actual number of accepted mats. The G the designated casting field for the awarded alternative, either Government mix design may vary as directed during casting operations.

NOTE 9: Bidders shall furnish unit prices for each item listed in the schedule requiring a unit price. If the bidder fails to insert a unit price in the appropriate blank for required item(s), but does furnish an extended total, or an estimated amount for such item(s), the Government shall deem the unit price to be the quotient obtained by dividing the extended amount for that line item by the quantity. IF A BIDDER

OMITS BOTH THE UNIT PRICE AND THE EXTENDED TOTAL OR ESTIMATED AMOUNT FOR ANY

ITEM, ITS BID SHALL BE DECLARED NON-RESPONSIVE AND THEREFORE INELIGIBLE FOR

AWARD.

NOTE 10: Any bid may be rejected if the Contracting Officer determines in writing that it is unreasonable as to price. Unreasonableness of price includes not only total price of bid, but the price for individual line items as well. Any bid may be rejected if the prices for any line items or sub line items are materially unbalanced (See FAR 14.404-2).

NOTE 11: RAPID VENDOR PAYMENT. Web based instructions for the submission of invoices;

http://www.mvn.usace.army.mil/BusinessWithUs/Contracting/RapidVendorPayment

NOTE 12: This contract shall be performed at the designated casting field for the awarded alternative, either Delta Point Casting Field or Richardson Landing Casting Field as indicated unless the designated the field becomes inaccessible or inoperable. If for any reason the designated field becomes inoperable, the Government, shall require the bidder to cast the squares required for this contract at either St. Francisville, LA Casting Field or Richardson Landing, TN Casting Field or Delta, LA Casting Field depending on availability. If this situation arises where the location of performance changes, the bidder may upon request and approval of the Contracting Officer, be allowed to request an equitable adjustment in contract price for concrete mattress pursuant to the Contract Clause, CHANGES – FIXED PRICE (FAR 52.243-1).

NOTE 13: The Contractor shall provide a vehicle and operator for hauling and delivering the field concrete specimens to the onsite testing laboratory. A vehicle operator shall be provided during the hours of concrete placement and at any time requested by the Contracting Officer Representative. The Contractor shall maintain the vehicle in a safe and reliable operating condition.

NOTE 14: If Alternative A, Casting at Delta, LA is awarded, access to the Delta casting field will be available to the Contractor shortly after contract award. If Alternative B, Casting at Richardson Landing, TN is awarded, access to the Richardson Landing field will be delayed until on or about July 1, 2021, and the contract notice to proceeds will be delayed accordingly. Access to the Richardson Landing field will be closely coordinated with the contractor to allow for earliest access possible. However, no actions can occur under this contract that will impact completion of ongoing casting operations.

NOTE 15: All technical inquiries and questions relating to this solicitation are to be submitted via Bidder Inquiry in ProjNet at http://www.projnet.org/projnet. See SNTB Page entitled “TECHNICAL INQUIRIES

AND QUESTIONS”.

NOTE 16: The SF33, Bidding Schedule, and Section K (representations, certifications, and other statement of offerors) must be accurately completed and returned with your bid or it may be rejected as nonresponsive. See Section L for Instructions and Special Notices to Bidders.

NOTE 17: Please be advised that the System for Award Management Registration (SAM) replaces CCR/FedReg and ORCA. All references to CCR and ORCA are to be replaced with SAM. Contractors may obtain information on registration and annual confirmation requirements via the SAM accessed through https://www.acquisition.gov or by calling 866-606-8220, or 334-206-7828 for international calls.

NOTE 18: AUTHORITY, APPROPRIATIONS, AND FUNDING INFORMATION

1. AUTHORITY: Flood Control Acts of 1928 (Section 1); 1936 (Section 1); 1938 (Section 4); 1941 (Section 3); 1944 (Section 10); 1962 (Section 203); 1965 (Section 201, 204); 1966 (Section 202, 203);

and 1970 (Section 207)

2. APPROPRIATION: Inventory Account

3. FUNDING CITATION: 096 NA X 4902 0000

NOTE 19: WAGE DETERMINATION. General Decision Numbers LA20220004, 02/25/2022, and TN20220138, 02/25/2022, are included in Section J of this solicitation.

NOTE 20: VETERANS EMPLOYMENT EMPHASIS FOR U.S. ARMY CORPS OF ENGINEERS

CONTRACTS:

In addition to complying with the requirements outlined in FAR Part 22.13, FAR Provision 52.222-38, FAR Clause 52.222-35, FAR Clause 52.222-37, DFARS 222.13 and Department of Labor regulations, U.S. Army Corps of Engineers (USACE) contractors and subcontractors at all tiers are encouraged to promote the training and employment of U.S. veterans while performing under a USACE contract.

While no set-aside, evaluation preference, or incentive applies to the solicitation or performance under the resultant contract, USACE contractors are encouraged to seek out highly qualified veterans to perform services under this contract. The following resources are available to assist USACE contractors in their outreach efforts:

- U.S. Department of Labor Veterans’ Employment and Training Service (VETS):

https://www.dol.gov/vets/

- Federal Veteran Employment Information: https://www.fedshirevets.gov/

- Veterans Opportunity to Work (VOW) Program: https://www.benefits.va.gov/vow/

- U.S. Army Warrior Transition Command Employment Index:

https://wct.army.mil/modules/employers/index.html

- Hiring Our Heroes: https://www.uschamberfoundation.org/hiring-our-heroes

Section C - Descriptions and Specifications

Section Table of Contents

SECTION C1 – DESCRIPTION/SPECIFICATION

1 DESCRIPTION OF WORK 1

1.1 Scope 1

1.2 Definitions 1

1.2.1 Square 1

1.2.2 Block 1

1.2.3 CWT 1

1.3 Location 1

2 PHYSICAL DATA 2

2.1 Access Roads 2

2.2 Reserved 2

2.3 Electricity 2

2.4 Potable Water 2

3 OTHER WORK 3

4 CONTRACT DRAWINGS AND SPECIFICATIONS 3

5 FIELD LAYOUT 4

6 REFERENCES 4

7 MATERIALS 6

7.1 Cementitious Materials 6

7.1.1 Portland Cement 6

7.1.2 Fly Ash 7

7.1.3 Transportation of Bulk Cement and Fly Ash 7

7.1.4 Storage 7

7.1.5 Quality Control and Quality Assurance 7

7.2 Calcium Chloride 8

7.2.1 Quality Control and Quality Assurance 8

7.3 Air-Entraining Admixture 8

7.3.1 Quality Control and Quality Assurance 8

7.4 Water-Reducing Admixture 8

7.4.1 Quality Control and Quality Assurance 8

7.5 Aggregate 9

7.5.1 General 9

7.5.2 Quality Control and Quality Assurance 9

7.5.3 Fine Aggregate 9

7.5.3.1 Storage of Fine Aggregate 10

7.5.4 Coarse Aggregate 10

7.5.4.1 Storage of Coarse Aggregates 10

7.6 Water 11

7.7 Curing Compounds 11

7.7.1 Quality Control and Quality Assurance 11

7.8 Kraft Paper 11

7.8.1 Quality Control and Quality Assurance 11

8 PLANT REQUIREMENTS 11

8.1 Measurement 11

8.2 Weight Batchers 12

8.3 Scales 12

8.4 Interlocks 12

8.5 Moisture Control Meter 13

8.6 Recorder 13

8.7 Batch Counters 14

8.8 Admixture Dispensers 14

8.9 Sampling 14

8.10 Reserved 14

8.11 Control Equipment Protection 14

8.12 Concrete Mixers 14

8.12.1 General 15

8.12.2 Stationary Mixers 16

8.12.3 Truck Mixers 16

8.12.4 Paving Mixers 16

9 ARTICULATED CONCRETE MATTRESS 17

9.1 Composition 17

9.1.1 Concrete 17

9.1.2 Strength 17

9.1.3 Proportioning of Concrete 17

9.1.3.1 General 17

9.1.3.2 Water Content 17

9.1.3.3 Cementitious Materials Content 17

9.1.3.4 Aggregate Content 18

9.1.3.5 Placeability 18

9.1.3.6 Slump 18

9.1.3.7 Air-Entraining 18

9.1.3.8 Calcium Chloride 18

9.2 Concrete Conveying 19

10 TRIAL OPERATION 19

10.1 Batch Operation 19

11 CASTING 20

11.1 General 20

11.2 Casting Procedure 20

11.2.1 Paper Installation 20

11.2.2 Form Placement 21

11.2.3 Form Release Agent 22

11.2.3.1 Form Release Agent – Commercial Products 22

11.2.3.1.1 Nonpetroleum Based 22

11.2.3.1.2 Petroleum Based 22

11.2.3.2 Form Release Agent – Other Than Commercial Products 22

11.2.3.2.1 General 22

11.2.3.2.2 Acceptance Criteria 22

11.2.3.2.3 Sampling 23

11.2.3.2.4 Analysis 23

11.2.3.2.5 Analytical Requirements 24

11.2.3.2.6 Form Release Agents – Disposal Prohibition 25

11.2.4 Concrete Placement 25

11.2.5 Roughened Finish 25

11.2.6 Form Stripping 26

11.2.7 Form Cleanup 26

12 CURING AND PROTECTION 27

12.1 Warm Weather 27

12.1.1 Ambient Temperature 40 to 70o F 27

12.1.2 Ambient Temperature Above 70o F 27

12.1.3 Curing Compound 27

12.2 Cold Weather 28

12.3 Rainy Weather 28

13 EXCESS PAPER 28

14 REPAIRING DEFICIENT MATTRESS 29

15 FIELD CONDITIONS 29

15.1 Field Maintenance 29

15.2 Wet Field Conditions 30

15.3 Casting Field Flooding 30

16 RECORDS 30

17 MEASUREMENT AND PAYMENT 30

17.1 Articulated Concrete Mattress 30

17.2 Cement 31

17.3 Fly Ash 31

17.4 Partial Payments

SECTION C1 – DESCRIPTION/SPECIFICATIONS

1 DESCRIPTION OF WORK

1.1 Scope

The work to be performed under this contract consists of furnishing all plant, materials, equipment, supplies, labor, and transportation, including, fuel, power, water (except as provided in Section H1 – SPECIAL CONTRACT REQUIREMENTS, paragraphs entitled "GOVERNMENT-FURNISHED FACILITIES" and "IDENTIFICATION OF GOVERNMENT-FURNISHED PROPERTY"), and performing all work as required in casting, finishing and curing squares of articulated concrete mattress at the location and in the quantity shown on the Bid Schedule, in strict accordance with the specifications, schedules and drawings, all of which are made a part thereof, and including such detail drawings as may be furnished by the Contracting Officer from time to time during the prosecution of the work. Upon completion of the Basic Work quantity of mattress to be cast, the Government may require the Contractor to complete all unfinished stacks of mattress as in accordance with the variation in quantity clause of Section F – DELIVERIES OR PERFORMANCE, paragraph entitled

"VARIATION IN QUANTITY (FAR 52.211-16 – APR 1984)".

1.2 Definitions

1.2.1 Square

One square (SQ) of articulated concrete mattress as referred to in these specifications consists of one section, approximately 25-feet by 4-feet by 3-inches containing 16 blocks of concrete, cast on a single unit of government furnished wire fabric.

1.2.2 Block

One block of concrete as referred to in these specifications consists of one section, approximately 1.5-feet by 4-feet by 3-inches. Each square contains 16 blocks of concrete.

1.2.3 CWT

CWT – is the abbreviation for the term “hundredweight” used to refer to a unit of 100 pounds.

1.3 Location

If Alternative A, Casting at Delta, LA is awarded, the casting field is located along the right descending bank of the Mississippi River at mile 438 above Head of Passes near Delta, Louisiana. If Alternative B, Casting at Richardson Landing, TN is awarded, the casting field is located along the left descending bank of the Mississippi River at mile 769 above Head of Passes near Randolph, TN.

2 PHYSICAL DATA

2.1 Access Roads

A gravel road leads to the casting field at Delta, LA. The use of the roads along the top of the levee is regulated by the Fifth Louisiana Levee District. Authority for such use must be obtained by the Contractor in advance from the Fifth Louisiana Levee District. It shall be the Contractor's responsibility to make any necessary arrangements to provide access for plant, labor, materials, and equipment, both to and from the Delta Point Casting Field.

Access to the casting field at Richardson Landing, TN, is as follows: State Highway 59 leads west to the casting field from Covington, TN.

2.2 Railroads

There is a railroad siding, if needed for Alternative A, in Delta, Louisiana. There is a railroad siding, if needed for Alternative B, in Covington, TN. The Contractor is responsible for determining the availability of railroad service.

2.3 Rivers

The casting field is accessible via the Mississippi River.

2.4 Electricity

Facilities for commercial electric power service is located at the field and electricity may be procured commercially. The Contractor shall make his/her own arrangements for power.

2.5 Potable Water

Water may be procured commercially, or it may be obtained from the Mississippi River, provided it meets the requirements for water as set out in these specifications. The Contractor shall provide drinking water for his/her workers and shall make his/her own arrangements for potable drinking water.

3 OTHER WORK

The Government may desire to load completed mattress sections or perform other work on the Government premises or in the immediate vicinity of areas where work is being performed while the Contractor's casting operations are in progress. The Contractor's plant layout and operations shall be such as to avoid interference with loading operations, storage and transportation of materials, storage of existing mattress, casting of additional mattresses, or other work not included in this contract.

During the period of performance of the mat casting contract at Richardson Landing a force main/pipeline Contractor is scheduled to perform directional drilling work during low water. The pipeline Contractor has been advised that casting operations will be ongoing concurrently during his work and he must coordinate and conduct his work so as to avoid impacts to the casting Contractor’s operations to the maximum extent possible. Both, the casting Contractor and the pipeline Contractor, must cooperate to allow the other work to occur concurrently with their operations. The pipeline Contractor will be located at the Northwest corner of the casting field and will occupy the area beginning from the western edge of Stack 13, Row L-3 and ending at the western border of the casting field. The Contractor will be constructing a pipeline outfall in the river adjacent to this area which will occupy areas of the river and will have directional drilling equipment located from top bank of the Mississippi River to the landward edge of Row L-3. The directional drilling Contractor will have traffic on the field that will travel on the Southern and Western border of the casting field. The Government shall not be held responsible for any delay caused by this Contractor. A meeting will be held with both contractors prior to the pipeline Contractor beginning work to ensure any concerns have been effectively coordinated.

4 CONTRACT DRAWINGS AND SPECIFICATIONS

The work shall conform to the drawings marked "Mississippi River, Casting Articulated Concrete Mattress, Delta Point Casting Field, Delta, LA or Richardson Landing Casting Field, Tennessee" with titles and file numbers as listed below, all of which form a part of these specifications and are available in the office of the U.S. Army Engineer District, Vicksburg, Corps of Engineers, 4155 South

Clay Street, Vicksburg, MS.

Drawing No. Title File No.

G-001 Cover Sheet ACM21_G-001.DGN

G-002 General Map - Delta, LA ACM21_G-002.DGN

G-003 General Map –

Richardson Landing, TN ACM21_G-003.DGN

C-101 Field Layout – Delta, LA ACM21_C-101.DGN

C-102 Field Layout – Richardson Landing, TN ACM21_C-102.DGN

C-501 Standard Layout and Typical Sections ACM21_C-501.DGN

C-502 Typical Sections ACM21_C-502.DGN

X-501 Storm Water Pollution

Prevention Plans Typical Details ACM21_X-501.DGN

5 FIELD LAYOUTS

The initial casting field layout shall be as shown for the alternative locations on Drawing No. C-101 and C-102, entitled "FIELD LAYOUT". After work is underway, the casting field layout and/or order of work may be altered to avoid hampering or being hampered by mat loading operation. Mattress stacks and rows of standard mattress stacks shall be developed from these layouts in a manner similar to that shown on Drawing No. C-501, entitled "STANDARD LAYOUT AND TYPICAL

SECTIONS”.

6 REFERENCES

The following publications referred to thereafter by basic designation only, form a part of this specification to the extent indicated by the references thereto:

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

ASTM C 33/C 33M (2018) Standard Specification for Concrete

Aggregates

ASTM C 39/C 39M (2018) Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens

ASTM C 70 (2013) Standard Test Method for Surface Moisture in

Fine Aggregate

ASTM C 94/C 94M (2017) Standard Specification for Ready-Mixed

Concrete

ASTM C 136 (2014) Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

ASTM C 143/C 143M (2015) Standard Test Method for Slump of Hydraulic- Cement Concrete

ASTM C 150 (2018) Standard Specification for Portland Cement

ASTM C 172 (2017) Standard Practice for Sampling Freshly Mixed

ASTM C 231 (2017) Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

ASTM C 260 (2010) Standard Specification for Air-

Entraining Admixtures for Concrete

ASTM C 309 (2011) Standard Specification for Liquid Membrane- Forming Compounds for Curing Concrete

ASTM C 494/C 494M (2017) Standard Specification for Chemical

Admixtures for Concrete

ASTM C 1567 (2013) Standard Test Method for Potential Alkali- Silica Reactivity of Combinations of Cementitious Materials and Aggregate (Accelerated Mortar-Bar Method)

ASTM D 75/D 75M (2014) Standard Practice for Sampling Aggregates ASTM D 98 (2015) Calcium Chloride ASTM D 4791 (2010) Flat Particles, Elongated Particles, or Flat and

Elongated Particles in Coarse Aggregate

U.S. ARMY CORPS OF ENGINEERS (USACE) STANDARDS

CRD-C 55 (1992) Within-Batch Uniformity of Freshly-Mixed

CRD-C 143 (1962) Meters for Automatic Indication of Moisture in

Fine Aggregate

CRD-C 400 (1963) Water for Use in Mixing or Curing Concrete

CODE OF FEDERAL REGULATIONS (CFR)

40 CFR 261, Subpart C (2005) Characteristics of Hazardous Waste

40 CFR 261, Subpart D (2005) Lists of Hazardous Wastes 40 CFR 261.21 (2005) Characteristics of Ignitability 40 CFR 261.22 (2005) Characteristics of Corrosivity

40 CFR 261.23 (2005) Characteristics of Reactivity

40 CFR 261.24 (2005) Toxicity Characteristic

40 CFR 261.31 (2005) Hazardous Wastes from Non-Specific Sources

40 CFR 261.32 (2005) Hazardous Wastes from Specific Sources

40 CFR 261.33 (2005) Discarded Commercial Chemical Products, Off-specification Species, Container Residues, and Spill Residues Thereof

NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY (NIST)

HANDBOOK 44 (2013 Edition) Specifications, Tolerances and Other

Technical Requirements for Weighing and Measuring Devices

COMMERCIAL ITEM DESCRIPTION

A-A-203C (Jan 1996) Paper, Kraft, Untreated

ENVIRONMENTAL PROTECTION AGENCY (EPA) PUBLICATION

SW-846 Third Edition (Sept 1986) Test Methods for Evaluating

Solid Waste, Physical/Chemical Methods

AMERICAN ASSOCIATION OF STATE HIGHWAY AND

TRANSPORTATION OFFICIALS (AASHTO)

AASHTO M 295 (2011) Coal Fly Ash and Raw or Calcined Natural

Pozzolan for Use in Concrete

7 MATERIALS

7.1 Cementitious Materials

7.1.1 Portland Cement

Portland Cement shall conform to ASTM C 150, low alkali, Type I or II, including false set requirements, except that the maximum amount of C3A shall be 15 percent.

Cement with a Blaine Fineness of 400 square meters per kilogram or greater shall be considered Type III cement.

7.1.2 Fly Ash

Fly ash shall conform to AASHTO M 295, Class C or F.

7.1.3 Transportation of Bulk Cement and Fly Ash

When bulk cement and/or fly ash is not unloaded from primary carriers directly into weather tight hoppers at the batching plant, transportation from the railhead, mill, or intermediate storage area to the batching plant shall be accomplished in weather tight trucks, conveyors, or other means which will protect the cement and fly ash completely from exposure to moisture.

7.1.4 Storage

Air-Entraining Admixture Separate storage facilities shall be provided for cement and fly ash.

Immediately upon receipt at the site of the work, cement and fly ash shall be stored in a dry weather tight and properly ventilated structure with adequate provisions for the prevention of absorption of moisture. Charging valves for storage of cement and fly ash shall be clearly marked to prevent inadvertent loading of the wrong material into this structure. All storage facilities shall be subject to approval and shall permit easy access for inspection and identification. In order that cement and fly ash may not become unduly aged after delivery, the Contractor shall use any cement or fly ash, which has been stored at the site for 60 days or more before using cement or fly ash of lesser age.

Fly ash or cement obtained from different sources shall not be stored in the same storage bin. The temperature of the cement and fly ash, as delivered to the site, shall not exceed 150o F.

7.1.5 Quality Control and Quality Assurance

The Contractor shall notify the Contracting Officer of the source from which the cement and fly ash will be obtained within ten days after award of the contract. Cement and fly ash will be accepted on the basis of a manufacturer's mill certificate of compliance. Unless otherwise authorized, no cement or fly ash shall be used until a satisfactory manufacturer's mill certificate for that cement or fly ash is in the possession of the Contracting Officer at the site of the work and same has been accepted. If the manufacturer's certificate indicates that the cement or fly ash, which has been delivered, is unsatisfactory, it shall be promptly removed from the site of the work by and at the expense of the Contractor. Fly ash and cement samples will be tested periodically during the casting season, at the Government's expense, to check compliance with the specifications. Cement and/or fly ash, which have not been used within four months after testing, shall be retested at the expense of the Contractor when directed by the Contracting Officer and will be rejected if test results are not satisfactory.

7.2 Calcium Chloride

Calcium chloride shall meet the requirements of ASTM D 98, Type S, Grade N1, N2, or N3.

7.2.1 Quality Control and Quality Assurance

Calcium chloride will be accepted on the basis of a manufacturer's mill certificate or certificate of compliance which certifies that the calcium chloride meets the specified requirements. The certificate shall be furnished in duplicate to the Contracting Officer at the time of delivery.

7.3 Air-Entraining Admixture

The air-entraining admixture shall conform to ASTM C 260 and shall consistently entrain the air content in the specified ranges under field conditions. The air- entraining admixture shall be in a solution of suitable viscosity for field use requiring no further dilution.

7.3.1 Quality Control and Quality Assurance

The Contractor shall notify the Contracting Officer of the source from which the admixture will be obtained within ten days after award of contract. The admixture will be accepted on the basis of mill certificates or certificates of compliance, which certify that the admixture meets the specified requirements. The admixture may be tested periodically, at the expense of the Government, to check compliance with the specifications. The Contractor shall provide satisfactory facilities for the procurement of test samples by the Contracting Officer. An air-entraining admixture which has been in storage at the project site for longer than six months or which has been subjected to freezing shall be retested at the expense of the Contractor when directed by the Contracting Officer and shall be rejected if test results are not satisfactory.

7.4 Water-Reducing Admixture

The water-reducing admixture shall conform to the requirements of ASTM C 494/C 494M, Type A.

7.4.1 Quality Control and Quality Assurance

The Contractor shall notify the Contracting Officer of the source from which the admixture will be obtained within ten days after award of the contract. The admixture will be accepted on the basis of mill certificates or certificates of compliance, which certify that the admixture meets the specified requirements. The admixture will be tested periodically, at the expense of the Government, to check compliance with the specifications. The Contractor shall provide satisfactory facilities for the procurement of test samples by the Contracting Officer. A water reducing admixture which has been in storage at the project site for longer than six months or which has been subjected to freezing shall be retested at the expense of the Contractor prior to its use.

7.5 Aggregate

7.5.1 General

All aggregates used in concrete for casting mats shall be obtained from a listed source in accordance with Section H1 – SPECIAL CONTRACT REQUIREMENTS, paragraph entitled "AGGREGATE SOURCES”. Aggregate, as delivered to the mixer, shall consist of clean, hard, and uncoated particles.

7.5.2 Quality Control and Quality Assurance

The Contractor shall notify the Contracting Officer of the sources from which the aggregates will be obtained within ten days after award of contract. The aggregate will be accepted on the basis of Certificates of Compliance with accompanying gradation tests, which certify that the aggregates meet the specified requirements. Gradation tests shall be accomplished by the Contractor from materials at the aggregate source(s) prior to shipment to the Casting Field. During construction, aggregate will be sampled in accordance with ASTM D 75/D 75M, as delivered to the mixer, to determine compliance with the specifications. The Contractor shall provide facilities and labor as may be necessary for the ready procurement of representative test samples. Samples from the weigh batcher shall be obtained when directed by the Contracting Officer and under his/her supervision. The Government will test such samples at its expense using appropriate Corps of Engineers' and ASTM testing methods. Tests of aggregates at various stages in the casting process and handling operations will be made at the discretion of the Contracting Officer.

7.5.3 Fine Aggregate

Fine aggregate shall consist of natural sand, or a combination of natural and manufactured sands.

The quality of the fine aggregates shall conform to ASTM C 33/C 33M. Fine aggregate shall be graded from fine to coarse and the gradation shall be within the following limits as delivered to the mixer or as incorporated in the mixed concrete when tested in accordance with ASTM C 136:

Sieve Size Percent Passing 3/8" 100 No. 4 95 – 100 No. 16 45 – 90 No. 50 7 – 30 No. 100 0 – 7 No. 200 0 – 3

7.5.3.1 Storage of Fine Aggregate

Fine aggregate shall be stored in such a manner as to avoid the inclusion of any foreign materials.

The storage piles shall be constructed so as to prevent segregation. The storage of the material in storage piles and its removal therefore shall be accomplished in such a manner as to result in maintaining uniformity of gradation. All fine aggregate shall remain in the stockpile for at least 96 hours prior to use. Sufficient aggregate shall be maintained at the site at all times to permit continuous placement of concrete at the specified rate. Any unacceptable material that is introduced to the stockpile shall be promptly separated from previously accepted material and removed from the stockpiled area before continuation of casting or within 24 hours if occurring during a period of no casting.

7.5.4 Coarse Aggregate

Coarse aggregate shall consist of gravel, crushed gravel, crushed stone, or a combination thereof.

Materials from different aggregate sources shall be stockpiled separately. When required, fines shall be removed from the coarse aggregates by adequate washing, or another suitable method approved by the Contracting Officer. The quantity of flat and/or elongated particles in the separate size groups of coarse aggregates, as defined and determined by ASTM D 4791, shall not exceed 25 percent. The quality of coarse aggregate shall conform to ASTM C 33/C 33M, Class 4M. Coarse aggregate shall conform to the following gradation requirements as delivered to the mixer or as incorporated in the mixed concrete when tested in accordance with ASTM C 136:

Sieve Size Percent Passing 1-1/2" 100 1" 90 – 100 1/2" 25 – 60 No. 4 0 – 10 No. 8 0 – 5 No. 200 0 – 1

7.5.4.1 Storage of Coarse Aggregates

Coarse aggregate storage piles shall be built adjacent to the batch plant and in such manner as to avoid the inclusion of any foreign material. Materials from different aggregate sources shall be stockpiled separately. Coarse aggregate shall remain in the stockpile for at least 48 hours prior to use. The storage piles shall be constructed so as to prevent segregation and to provide for drainage away from the storage piles. The deposition of the material in storage and its removal therefore shall be accomplished in such a manner as to result in maintaining the uniformity of the gradation.

Sufficient aggregate shall be maintained at the site at all times to permit continuous placement of concrete at the specified rate. Any unacceptable material that is introduced to the stockpile shall be promptly separated from previously accepted material and removed from the stockpiled area before continuation of casting or within 24 hours if occurring during a period of no casting.

7.6 Water

Water for mixing shall be clean and potable, except that non-potable water may be used if it meets the requirements of CRD-C 400. Water for curing shall not contain any substance that is injurious to the concrete.

7.7 Curing Compounds

Curing compounds shall be of the surface membrane type, conforming to ASTM C 309, Type 2.

7.7.1 Quality Control and Quality Assurance

The Contractor shall furnish certificates of compliance, at or before the time of delivery, in duplicate, to the Contracting Officer, which certify that the curing compound meets the specified requirements.

7.8 Kraft Paper

The paper used as separators between mattress squares shall not be less than 48 inches wide and not greater than 50 inches in width and shall conform to the maximum requirements set out in Commercial Item Description Notice – CID A-A- 203C, Style 1 with the exception of the requirements specified herein. The paper basis weight shall be not less than 99 pounds; that is, 500 sheets, 24 inches by 36 inche s shall weigh not less than 99 pounds. The Contractor may, at his/her option and at no additional cost to the Government, elect to use a heavier weight paper.

7.8.1 Quality Control and Quality Assurance

The Contractor shall either furnish mill certificates or certificates of compliance, in duplicate, to the Contracting Officer which certify that the paper meets the specified requirements.

8 PLANT REQUIREMENTS

8.1 Measurement

All materials entering into the concrete shall be mechanically batched and measured by weight except the admixtures which may be batched by volume and except water may be batched by weight or volume. One gallon of water will be considered as 8.33 pounds in weight.

8.2 Weight Batchers

The weight batchers shall be arranged to permit the convenient addition or removal of material. The weight batchers shall be so constructed and arranged that the sequence and timing of batcher discharge gates can be controlled to produce a ribboning and mixing of the aggregates, water, and of the cement and fly ash with aggregates as the materials pass through the charging hopper into the mixer. The plant shall include provisions to facilitate the inspection of all operations at all times.

Delivery of materials from the batching equipment shall be within the following limits of accuracy:

Material Percent Cement and Fly Ash 0 – 2 Water (+/-)1 Aggregate (+/-)2 Admixtures (+/-)3

8.3 Scales

The batch plant shall include adequate facilities for the accurate measurement and control of each of the materials entering each batch of concrete. The accuracy of weighing equipment shall conform to the applicable requirements of NIST Handbook 44, except that the accuracy shall be within 0.2 percent of scale capacity. The Contractor shall provide standard test weights and any other auxiliary equipment required for checking the operating performance of each scale or other measuring device. Periodic tests shall be made in the presence of a Contracting Officer in such a manner and at such intervals as may be directed. Upon completion of each check test and before further use of the indicating, recording, or control devices, the Contractor shall make such adjustments, repairs or replacement as may be required for satisfactory performance. Each weighing unit shall include a visible springless dial or electronic indicator, which shall indicate the scale load at all stages of the weighing operation or shall include a beam scale with a beam balance indicator which will show the scale in balance at zero load at any beam setting. The indicator shall have an over and under travel equal to at least five percent of the capacity of the beam. The weighing equipment shall be arranged so that the concrete plant operator can conveniently observe the dials or indicators.

8.4 Interlocks

Batchers and mixers shall be interlocked so that:

(1) The charging mechanism of each batcher cannot be opened until the scale has returned to zero,

(2) The charging mechanism cannot be opened if the discharge mechanism is opened,

(3) The discharge mechanism cannot be opened if the charging mechanism is open,

(4) The discharge mechanism cannot be opened until the designated weight has been reached within the allowable tolerance,

(5) One admixture is batched automatically with the water,

(6) Each additional admixture is batched automatically with a separate portion of the water or with the fine aggregate, and

(7) The mixers cannot be discharged until the required mixing time has elapsed.

8.5 Moisture Control Meter

The plant shall be capable of ready adjustment to compensate for the varying moisture content of the aggregate in order to change the weights of the materials being batched. An electric moisture meter, complying with the provisions of CRD-C 143, shall be provided for measurement of moisture in the fine aggregate. The sensing element shall be arranged so that the measurement is made near the batcher charging gate of the sand bin or in the sand batcher.

8.6 Recorder

An accurate recorder shall be provided and shall conform to the following requirements:

(1) The recording units shall be completely housed in a single cabinet, which shall be capable of being locked.

(2) The recorder shall produce a graphical or digital record on a single visible chart or tape which shall indicate the weight or volume of each material in the batchers at the conclusion of the batching cycle. The record shall be produced prior to delivery of the materials to the mixer. After the batchers have been discharged, the recorder shall indicate the return of the batcher to the empty condition.

(3) The chart or tape shall be so marked that each batch may be permanently identified and so that variations in batch weights of each type of batch can be readily observed.

(4) The chart or tape shall show the date and time of day at intervals of not more than 15 minutes. Graduation lines on the cementitious materials chart shall be at intervals of not more than 20 pounds.

(5) The recorded chart or tape shall become the property of the Government.

(6) The recorder shall be placed in a position convenient for observation by the concrete plant operator and the Contracting Officer, and mounted to prevent excessive vibration, which causes inaccurate readings.

(7) The recorded weights or volumes, when compared to the weights or volumes actually batched, shall be within (+/-) two percent.

8.7 Batch Counters

The plant shall include devices for automatically counting the total number of batches of all concrete batched.

8.8 Admixture Dispensers

An accurate mechanical system for measuring and dispensing each admixture shall be provided.

Each system shall be capable of ready adjustment to permit varying the quantity of admixtures to be batched. Each admixture shall be added to the batch in a separate portion of the mixing water or in a separate portion of the fine aggregate in a manner to ensure uniform distribution of the admixtures throughout the batch. The dispensing systems shall provide a convenient means of visually observing from the control panel the admixture in process of being batched or discharged.

8.9 Sampling

The Contractor shall provide suitable facilities and labor for obtaining representative samples of concrete from the mixer or the wet batch hopper for Contractor quality control and Government quality assurance testing. All necessary platforms, tools and equipment for obtaining samples shall be furnished by the Contractor.

8.10 Reserved

8.11 Control Equipment Protection

The indicating, recording, and control equipment shall be sufficiently protected against exposure to dust, moisture, and vibration so there will be no interference with proper operation of the equipment.

8.12 Concrete Mixers

8.12.1 General

Mixers may be stationary mixers, truck mixers, paving mixers, or turbine-type mixers of approved design. The mixers shall have a rated capacity of at least 27 cubic feet of mixed concrete and shall not be charged in excess of the capacity recommended by the manufacturer.