AMEND-0005_W912HY-20-B-0005.pdf

W45VAK90531073

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

Project Title: Trinity River, Texas Wallisville Project, West Non-Overflow Dam Road Improvements.

The purpose of this amendment is as follows:

See Continuation Pages

1. CONTRACT ID CODE PAGE OF PAGES

J 1 2

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street , County, State and Zip Code) X W912HY20B0005

X 9B. DATED (SEE ITEM 11)

30-Dec-2019

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, X is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO.

5. PROJECT NO.(If applicable)

6. ISSUED BY

3.EFFECTIVE

DATE

30-Jan-2020

CODE 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

W912HY

US ARMY CORPS OF ENGINEERS

2000 FORT POINT ROAD

P.O. BOX 1229

GALVESTON TX 77553-1229

W912HY20B0005

A0005-2

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

1. THE SPECIFICATIONS FOR SOLICITATION NO. W912HY20B0005, TRINITY RIVER,

TEXAS, WALLISVILLE PROJECT WEST NON-OVERFLOW DAM ROAD

IMPROVEMENTS, ARE HEREBY AMENDED AS FOLLOWS:

THE BID DUE DATE IS TO REMAIN THE SAME.

a) Specifications.

(1) SECTION 03 31 00.00 45, CONCRETE FOR MINOR STRUCTURES – The enclosed SECTION 03 31 00.00 45 entitled CONCRETE FOR MINOR STRUCTURES supersedes that issued with this Solicitation.

b) Drawings.

(1) NONE

2. This amendment shall be attached to and become a part of the solicitation.

01 Encls:

1. SECTION 03 31 00.00 45, CONCRETE FOR MINOR STRUCTURES

SWG FILE NO: TRIN 201-122 SOLICITATION NO: W912HY20B0005

SECTION TABLE OF CONTENTS

DIVISION 03 - CONCRETE

SECTION 03 31 00.00 45

CONCRETE FOR MINOR STRUCTURES AMENDMENT NO. 0005

PART 1 GENERAL

1.1 SUMMARY

1.2 MEASUREMENT AND PAYMENT

1.3 REFERENCES

1.4 SUBMITTALS

PART 2 PRODUCTS

2.1 CERTIFICATE OF COMPLIANCE

2.2 CEMENTITIOUS MATERIALS

2.2.1 Portland Cement

2.3 AGGREGATES

2.4 POZZOLAN (FLY ASH)

2.5 CHEMICAL ADMIXTURES

2.5.1 Water-Reducing or Retarding Admixture

2.6 CURING MATERIALS

2.6.1 Impervious-Sheet

2.6.2 Membrane-Forming Compound

2.7 WATER

2.8 FORMWORK

2.8.1 Form Coatings

2.9 SAMPLING AND TESTING

2.9.1 Strength Design

2.9.2 Construction Surface and Tolerances

2.9.3 Concrete Mixture Proportions

2.9.4 Ready-Mix Concrete

2.10 Bagged Concrete AM#5

PART 3 EXECUTION

3.1 PREPARATION FOR PLACING

3.1.1 Formwork Installation

3.1.2 Production of Concrete

3.1.2.1 Ready-Mixed Concrete

3.2 CONVEYING AND PLACING CONCRETE

3.2.1 Cold-Weather Requirements

3.2.2 Hot-Weather Requirements

3.2.3 Consolidation

3.3 FORM REMOVAL

3.4 FINISHING

3.4.1 Broom Finish

3.5 CURING AND PROTECTION

3.5.1 Curing

3.5.2 Preservation of Moisture

3.6 TESTING AND INSPECTION FOR CONTRACTOR QUALITY CONTROL

SECTION 03 31 00.00 45 Page 1

TO ACCOMPANY AMENDMENT NO. 0005 OF SOLICITATION W912HY20B0005

3.6.1 Inspection Details and Frequency of Testing

3.6.1.1 Preparations for Placing

3.6.1.2 Air Content

3.6.1.3 Slump

3.6.1.4 Consolidation and Protection

3.6.2 Action Required

3.6.2.1 Placing

3.6.2.2 Air Content

3.6.2.3 Slump

3.6.3 Reports

3.7 Concrete Pot Hole Repairs AM#5

-- End of Section Table of Contents --

SECTION 03 31 00.00 45 Page 2

SECTION 03 31 00.00 45

CONCRETE FOR MINOR STRUCTURES

AMENDMENT NO. 0005

PART 1 GENERAL

1.1 SUMMARY

The work covered in this Section consists of materials, labor, testing, and techniques required to place quality portland cement concrete.

1.2 MEASUREMENT AND PAYMENT

Measurement and payment for concrete for minor structures will be paid for in accordance with provisions of the SECTION 01 22 00.10 MEASUREMENT AND

PAYMENT.

1.3 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN CONCRETE INSTITUTE (ACI)

ACI 117 (2010; Errata 2011) Specifications for Tolerances for Concrete Construction and Materials and Commentary

ACI 214R (2011) Evaluation of Strength Test Results of Concrete

ACI 301 (2016) Specifications for Structural Concrete

ACI 305R (2010) Guide to Hot Weather Concreting

ACI 306R (2016) Guide to Cold Weather Concreting

ACI 308.1 (2011) Specification for Curing Concrete

ACI 347 (2004; Errata 2008; Errata 2012) Guide to Formwork for Concrete

ACI MCP SET (2017) Manual of Concrete Practice

ASTM INTERNATIONAL (ASTM)

ASTM C1059/C1059M (2013) Standard Specification for Latex Agents for Bonding Fresh to Hardened Concrete

ASTM C143/C143M (2015a) Standard Test Method for Slump of Hydraulic-Cement Concrete

SECTION 03 31 00.00 45 Page 3

ASTM C150 (2009) Standard Specification for Portland Cement

ASTM C171 (2016) Standard Specification for Sheet Materials for Curing Concrete

ASTM C172 (2010) Standard Practice for Sampling Freshly Mixed Concrete

ASTM C231/C231M (2017a) Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

ASTM C309 (2011) Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete

ASTM C33/C33M (2016) Standard Specification for Concrete Aggregates

ASTM C387/C387M-17 (2017) Standard Specification for Packaged, Dry, Combined Materials for Concrete and High Strength Mortar

ASTM C494/C494M (2017) Standard Specification for Chemical Admixtures for Concrete

ASTM C618 (2017a) Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

ASTM C94/C94M (2017a) Standard Specification for Ready-Mixed Concrete

TEXAS DEPARTMENT OF TRANSPORTATION (TXDOT)

TXDOT Item 421.2 (2004) Hydraulic Cement Concrete

1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with the SECTION 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Conveying and Placing Concrete

Submit the methods and equipment for transporting, handling, depositing, and consolidating the concrete prior to the first concrete placement.

Concrete Mixture Proportions ; G

Submit 10 days prior to placement of concrete, the mixture proportions that will produce concrete of the quality required;

Applicable test reports to verify that the concrete mixture

SECTION 03 31 00.00 45 Page 4 proportions selected will produce concrete of the quality specified.

SD-03 Product Data

Water-Reducing or Retarding Admixture Curing Materials Portland Cement

Manufacturer's literature is available from suppliers demonstrating compliance with applicable specifications.

Batching and Mixing Equipment

Batching and mixing equipment will be accepted on the basis of manufacturer's data that demonstrates compliance with the applicable specifications.

SD-06 Test Reports

Aggregates

Aggregates will be accepted on the basis of certificates of compliance and test reports that show the material(s) meets the quality and grading requirements of the specifications under which it is furnished.

Testing And Inspection

SD-07 Certificates

Certificate of Compliance

PART 2 PRODUCTS

2.1 CERTIFICATE OF COMPLIANCE

Certificates required for demonstrating proof of compliance of materials with specification requirements shall be executed in three copies. Each certificate will be signed by an official authorized to certify in behalf of the manufacturing company and contain the name and address of the Contractor, the project name and location, and the quantity and date or dates of shipment or delivery to which the certificates apply. Copies of laboratory test reports submitted with certificates are to contain the name and address of the testing laboratory and the date or dates of the tests to which the report applies. Certification are not to be construed as relieving the Contractor from furnishing satisfactory material, if after tests are performed on selected samples, the material is found not to meet the specific requirements.

2.2 CEMENTITIOUS MATERIALS

Cementitious Materials are to be portland cement, and conform to appropriate specifications listed below. Use of cementitious materials in concrete which will have surfaces exposed in the completed structure are to be restricted so there is no change in color, source, or type of cementitious material.

Cementitious material will be accepted on the basis of a manufacturer's

SECTION 03 31 00.00 45 Page 5 certificate of compliance, accompanied by mill test reports that the materials meet the requirements of the specification under which it is furnished.

2.2.1 Portland Cement

Cement shall be portland cement conforming to ASTM C150, Type II or V, low alkali.

2.3 AGGREGATES

Fine aggregate shall conform to ASTM C33/C33M and be composed of clean, uncoated grains of material. Coarse aggregate shall conform to ASTM C33/C33M, Table 2 Grading Requirements for Coarse Aggregates for any of the following Size Number 2, 3, 4, 5, 56, 57 357, and 467 or TXDOT Item 421.2

2.4 POZZOLAN (FLY ASH)

Pozzolan (fly ash) shall conform with ASTM C618, Class F or C. The loss of ignition shall not exceed 6.0 percent.

2.5 CHEMICAL ADMIXTURES

Chemical admixtures, to be used, when required or approved, are to comply with the appropriate specification listed. Chemical admixtures that have been in storage at the project site for longer than 6 months or have been subjected to freezing are to be retested at the expense of the Contractor when directed by the Contracting Officer and will be rejected if test results are not satisfactory.

2.5.1 Water-Reducing or Retarding Admixture

ASTM C494/C494M, Type A, B, or D.

2.6 CURING MATERIALS

2.6.1 Impervious-Sheet

Impervious-sheet materials are to conform to ASTM C171, type optional, except polyethylene film, if used, are to be white opaque.

2.6.2 Membrane-Forming Compound

Membrane-Forming curing compound is to conform to ASTM C309, Type 1-D or 2, Class B.

2.7 WATER

Water for mixing and curing is to be drinkable and fresh, clean, potable, and free of injurious amounts of oil, acid, salt, or alkali.

2.8 FORMWORK

The design and engineering of the formwork, as well as its construction, is to be the responsibility of the Contractor.

SECTION 03 31 00.00 45 Page 6

2.8.1 Form Coatings

Forms for exposed surfaces are to be coated with a non-staining form oil, which is to be applied shortly before concrete is placed.

2.9 SAMPLING AND TESTING

The Government will maintain the discretion to sample and test aggregates and concrete to determine compliance with the specifications. Provide facilities and labor when necessary to assist the Government in procurement of representative test samples.

2.9.1 Strength Design

Compressive Strength @ 28 days, psi

Maximum Water Cement Ratio

3,000 0.45

2.9.2 Construction Surface and Tolerances

A Class "C" finish according to ACI 117 is to apply to surfaces except those specified to receive a Class "D" finish. Tolerances are to conform to class surface "C" on table 3.1 ACI 347 . A Class "D" finish is to apply to surfaces that will be permanently concealed after construction.

Surface requirements for the classes of finish required are as specified in Part 4 of ACI MCP SET

2.9.3 Concrete Mixture Proportions

Concrete Mixture Proportions are to be the responsibility of the Contractor. Mixture proportions are to include the dry weights of Cementious material(s); the nominal maximum size of the coarse aggregate;

the specific gravities, absorptions, and saturated surface-dry weights of fine and coarse aggregates; the quantities, types, and names of admixtures; and quantity of water per cubic yard of concrete. Materials included in the mixture proportions are to be of the same type and from the same source as will be used on this project. The maximum nominal size coarse aggregate is to be 2-1/2 inches . The air content is to be 6.0 percent, plus or minus 1.5 percent. The slump is to be between 3 and 5 inches. The maximum water cement ratio is to be 0.45 for the drop-outlet structure foundation and storm drain re-inforced concrete.

2.9.4 Ready-Mix Concrete

If Ready-Mix Concrete to be used, it is to meet the requirements of

ASTM C94/C94M.

Ready-mixed concrete manufacturer must provide duplicate delivery tickets with each load of concrete delivered. Provide delivery tickets with the following information in addition to that required by ASTM C94/C94M:

Type and brand cement

Cement content in 95-pound bags per cubic yard of concrete

Maximum size of aggregate

SECTION 03 31 00.00 45 Page 7

Amount and brand name of admixtures

Total water content expressed by water/cement ratio

2. 10 Bagged Concr et e AM#5

Al l bagged concr et e shal l meet t he r equi r ement s of ASTM C387/ C387M- 17.

Bagged Concr et e st or ed on si t e shal l be kept i n a dr y cont ai ner . Aqui r e bagged concr et e no mor e t han f i ve ( 5) days bef or e use. Thi s concr et e can onl y be used f or pot hol e r epai r s, set t i ng s i gns and ot her mi nor r epai r s or i nst al l at i ons appr oved by he Cont r act i ng Of f i cer .

PART 3 EXECUTION

3.1 PREPARATION FOR PLACING

Do not begin installation until substrates have been properly constructed;

verify that substrates are plumb and true.

Check specified elevation and dimensions before beginning installation.

If foundation elevation or dimensions vary more than 1/2 inch from design for proper installation, notify the contracting officer and wait for instructions before beginning installation. Determine quantity of concrete needed and minimize the production of excess concrete. Designate locations or uses for potential excess concrete before the concrete is placed.

Surfaces against which concrete is to be placed must be free of debris, loose material, standing water, snow, ice, and other deleterious substances before start of concrete placing. Any latex bonding agent, if used, it is to conform to ASTM C1059/C1059M . Standing or flowing water, loose particles, debris, and foreign material are to have been removed.

Earth foundations are to be satisfactorily compacted. Spare vibrators are to be available. Preparation is to be approved prior to placing.

3.1.1 Formwork Installation

Forms are to be properly aligned, adequately supported, and mortar-tight.

The form surfaces are to be smooth and free from irregularities, dents, sags or holes when used for permanently exposed faces.

3.1.2 Production of Concrete

3.1.2.1 Ready-Mixed Concrete

Ready-mixed concrete is to conform to the requirements of ASTM C94/C94M, and "Option A" in the Ordering Information Section, except as otherwise specified or approved.

3.2 CONVEYING AND PLACING CONCRETE

Convey and place concrete in accordance with ACI 301 , Section 5.

3.2.1 Cold-Weather Requirements

Place concrete in cold weather in accordance with ACI 306R .

SECTION 03 31 00.00 45 Page 8

3.2.2 Hot-Weather Requirements

Place concrete in hot weather in accordance with ACI 305R .

3.2.3 Consolidation

Each layer of concrete is to be consolidated by internal vibrating equipment. Internal vibration is to be systematically accomplished by inserting the vibrator through the fresh concrete in the layer below at a uniform spacing over the entire area of placement. The distance between insertions is to be approximately 1.5 times the radius of action of the vibrator and overlay the adjacent, just vibrated area by a few inches.

The vibrator is to penetrate rapidly to the bottom of the layer and at least 6 inches into the layer below when a lower layer exists. It is to be held stationary until the concrete is consolidated and then withdrawn slowly at the rate of about 3 inches per second.

3.3 FORM REMOVAL

Forms are not to be removed before the expiration of 24 hours after concrete placement except where otherwise specifically authorized.

Supporting forms and shoring are not to be removed until the concrete has cured for at least 5 days. When conditions on the work do not justify this requirement, forms will be required to remain in place for longer periods.

3.4 FINISHING

No finishing or repair will be done when either the concrete or ambient temperature is below 50 degrees F .

3.4.1 Broom Finish

A broom finish is to be applied to the concrete slab. The concrete is to be screeded and floated to the required finish plane with no coarse aggregate visible. After surface moisture disappears, the surface are to be broomed or brushed with a broom or fiber brush in a direction transverse to that of the water flow or as directed.

3.5 CURING AND PROTECTION

3.5.1 Curing

Beginning immediately after placement and continuing for at least 7 days conforming to ACI 308.1 , the concrete is to be cured and protected from premature drying, extremes in temperature, rapid temperature change, freezing, mechanical damage, and exposure to rain or flowing water.

Materials and equipment used for adequate curing and protection are to be available and at the placement site prior to start of concrete placement.

Preservation of moisture for concrete surfaces not in contact with forms is to be accomplished by one of the following methods:

(1) Continuous sprinkling or ponding

(2) Application of absorptive mats or fabrics kept continuously wet.

(3) Application of sand kept continuously wet.

SECTION 03 31 00.00 45 Page 9

(4) Application of impervious sheet material conforming to

ASTM C171.

(5) Application of membrane forming curing compound conforming to ASTM C309, Type 1-D, on surfaces permanently exposed to view and Type 2 on other surfaces is to be accomplished in accordance with manufacturer's instructions.

3.5.2 Preservation of Moisture

The preservation of moisture for concrete surfaces placed against wooden forms is to be accomplished by keeping the forms continuously wet for 7 days. If forms are removed prior to end of the required curing period, other curing methods are to be used for the balance of the curing period.

During the period of protection removal, the temperature of the air in contact with the concrete is not to be allowed to drop more than 25 degrees F within a 24-hour period.

3.6 TESTING AND INSPECTION FOR CONTRACTOR QUALITY CONTROL

Individuals required to sample and test the concrete specified herein are to have demonstrated a knowledge and ability to perform the necessary test procedures equivalent to the ACI 214R guidelines for certification of Concrete Field Testing Technicians.

3.6.1 Inspection Details and Frequency of Testing

3.6.1.1 Preparations for Placing

Inspect foundation or construction joints, forms, and embedded items in sufficient time prior to each concrete placement to certify to the Contracting Officer that these items are ready to receive concrete.

3.6.1.2 Air Content

Air content is to be checked at least once during each shift that concrete is placed for each class of concrete required. Samples are to be obtained in accordance with ASTM C172 and tested in accordance with ASTM C231/C231M.

3.6.1.3 Slump

Slump is to be 3 to 5 inches and be checked twice during each shift that concrete is produced for each class of concrete required. Samples are to be obtained in accordance with ASTM C172 and tested in accordance with

ASTM C143/C143M.

3.6.1.4 Consolidation and Protection

Ensure that the concrete is properly consolidated, finished, protected, and cured.

3.6.2 Action Required

3.6.2.1 Placing

The placing foreman is not to permit placing to begin until verification is received stating that an adequate number of acceptable vibrators in working order with competent operators are available. Placing is not to be continued if concrete is inadequately consolidated.

SECTION 03 31 00.00 45 Page 10

3.6.2.2 Air Content

When a test result is outside the specification limits, the concrete is not to be delivered to the forms and an adjustment is to be made to the dosage of air-entrainment admixture.

3.6.2.3 Slump

When a test result is outside the specification limits the concrete is not to be delivered to the forms and an adjustment is to be made to the batch weights of water and fine aggregate. The adjustments are to be made so that the water-cement ratio does not exceed that specified in the submitted concrete mixture proportion.

3.6.3 Reports

The results of tests or inspections conducted are to be reported informally as they are completed and in writing daily and be submitted at the end of each daily reporting period as specified in the SECTION

01 45 01.00 45 QUALITY CONTROL.

3. 7 Concr et e Pot Hol e Repai r s AM#5

At t he di scr et i on of t he Cont r act or , concr et e pot hol e r epai r shal l be per f or med usi ng a r eady- mi x concr et e or bagged concr et e. The pot hol es shal l be squar ed up wi t h a met hod t hat l eaves a r ough sur f ace. I f a saw i s used, a r oughness wi l l be cr eat ed ar ound t he si des of t he hol e wi t h a wi r e br ush or s i mi l ar met hod.

I f bagged concr et e i s used, mi x accor di ng t o t he manuf act ur er s i nst r uct i ons. Moi st en t he si de of t he hol e j ust bef or e pl aci ng t he concrete.

-- End of Section --

SECTION 03 31 00.00 45 Page 11

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SECTION 03 31 00.00 45 Page 12

2.10 Bagged Concrete AM#5

3.6.3 Reports

3.7 Concrete Pot Hole Repairs AM#5