Amendment_No._0003.pdf

(x)

R17PS00153

x x 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 ACKNOWLEDGEMENT 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.

x

Billings MT 59107

R60

PO Box 36900 Regional Office Great Plains Region Bureau of Reclamation

02/23/20170003

13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS. IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

12. ACCOUNTING AND APPROPRIATION DATA (If required) is not extended.is extended, Items 8 and 15, and returning

Offers 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

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

FACILITY CODE CODE

10B. DATED (SEE ITEM 13)

10A. MODIFICATION OF CONTRACT/ORDER NO.

9B. DATED (SEE ITEM 11)

9A. AMENDMENT OF SOLICITATION NO.

CODE

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code)

7. ADMINISTERED BY (If other than Item 6)CODE 6. ISSUED BY

PAGE OF PAGES

4. REQUISITION/PURCHASE REQ. NO.3. EFFECTIVE DATE2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO. (If applicable)

1. CONTRACT ID CODE

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

01/18/2017

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

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority) appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

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

ORDER NO. IN ITEM 10A.

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

Project Title: Box Butte Dam Toe Drain Modifications, Mirage Flats Project, Nebraska

See Page 2 for changes incorporated by this amendment:

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)15A. NAME AND TITLE OF SIGNER (Type or print)

15C. DATE SIGNED 16B. UNITED STATES OF AMERICA 15B. CONTRACTOR/OFFEROR 16C. DATE SIGNED

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

Gerri Voto-Braun

STANDARD FORM 30 (REV. 10-83)

Prescribed by GSA

FAR (48 CFR) 53.243

NSN 7540-01-152-8070

Previous edition unusable

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

Solicitation Number R17S00153 Amendment No. 0003

Description of Changes:

1. In Part I – The Schedule, Specification Section 01 33 00 – Submittals, remove pages 01 33 00-5 through 01 33 00-8 and substitute therefor the attached revised pages 01 33 00-5 through 01 33 00-8.

2. In Part I – The Schedule, remove Specifications Section 01 35 30 – Contractor’s Onsite Safety

Personnel in its entirety and substitute therefor the attached revised Section 01 35 30.

3. In Part I – The Schedule, Specification Section 03 30 00 – Cast-In-Place Concrete, remove pages 03 30 00-27 through 03 30 00-30 and substitute therefor the attached revised pages 03 30 00-27 through 03 30 00-30.

For convenience, essential changes on the revised solicitation pages are indicated by a vertical line in the margin where lines or paragraphs changed from the previous version. However, all portions of the revised solicitation pages shall apply whether changes thereon have or have not been indicated.

Acknowledgement: See Block 11 above regarding how to acknowledge this amendment. The Government must receive the acknowledgement at the place designated for receipt of bids (See Block 10 of the Standard Form 1442).

Receipt of Bids: The hour and date for receipt of sealed bids is hereby changed to 2:00 pm MST on March 1, 2017

Third Party: If you have given a copy of the solicitation to someone else, please forward this amendment accordingly.

Questions and submitted by prospective contractors prior to the cutoff date are attached and included as a part of this amendment.

CONTRACTOR QUESTIONS

BOX BUTTE TOE DRAIN MODIFICATION

1. I noticed a fair amount of Rock Riprap on the backside of the dam. Do you want them permanently stockpiled somewhere? If so where? Or do you want them replaced back on the slope?

A: Refer to Specifications Section 31 23 39 – Disposal of Excavated Materials. Any rock riprap on the downstream side of the dam was not part of the original design and should be minimal in quantity. Rock riprap removed during excavation may be piled downstream of the dam in the staging or borrow areas.

2. If unwatering using trenches, ditches, & surface pumps (reference Section 01 14 20) is not enough to perform the work will a modification in the contract (price and time) to install dewatering system be allowed?

A: Refer to Specifications Section 53 00 05 Baseline Conditions for baseline groundwater conditions. Section 53 0 05 Baseline Conditions defines the groundwater conditions that the bid shall be based upon.

3. In Section 01 71 20 Surveying you are requiring a Professional Land Surveyor or Professional Engineer to oversee survey work. When we have worked with the Bureau previously our on staff surveyor and CAD programs were sufficient. Will this be acceptable on this project?

A: Refer to Specifications Section 01 71 20, Article 1.05.

4. In Section 33 46 36 Toe Drains part 3.05 you are asking for two video inspections to be perform using a compass camera the is capable of locating pipe elevations and coordinates. I am having difficulty finding any contractors with this capability. Will this be required? If so do you have any names of contractors that you have used before with these capabilities?

A: Refer to revised Specifications Section 33 46 36 Toe Drains included in Amendment 2.

5. In Section 01 35 30 Contractor’s Onsite Safety Personnel you are requiring a Certified Industrial Hygienist to be onsite periodically. In calling around to find a CIH they ask about the project and wondering why you are requiring a CIH. Could you give some clarification into the reason for the CIH.

A: Refer to revised Specifications Section 01 35 30 – Contractor’s Onsite Safety Personnel included in Amendment 3.

6. I need some clarification on the type of HDPE pipe is required for this project. The specifications call out for solid pipe and profile pipe. The application seems perfectly suited for profile pipe but the SDR and butt fusion specs don’t allow it. Who can I talk to that can answer my question?

A: Requirements for pipe are as stated in Specifications Section 33 46 36 Toe Drains, paragraph 2.01 A.

7. Need clarification on the PE pipe in Section 33 46 36. In reference standards it Corrugated PE pipe and elastomeric seals, along with heat fusion and pressure pipe. In the products section it only references Pressure pipe with butt fused joints. Will corrugated HDPE with gaskets be acceptable or do you on want SDR17 with butt fused joints?

A: Refer to Specifications Section 33 46 36 Toe Drains, Paragraph 2.01.A.

8. We noticed a RSN #5 on page 01 33 00-6 of the specifications regarding RR insurance. Please confirm what if any RR insurance is required for the project.

A: Refer to revised Specifications Section 01 33 00 – Submittals included in Amendment 3.

9. Did the BOR identify any aggregate supplier in the area, during the design phase, for the Zone 2A/Zone 3A products that you can share contact information on.

A: Refer to Specifications Section 53 10 00 – Geologic Investigations, Paragraph 1.07.D.1. and Specifications Section 53 20 00 – Records of Geologic and Subsurface Investigations.

10. On page 01 71 20-4 of the solicitation R17PS00153 they call for Government provided codes for land surveying for the Box Butte Dam project as shown below.

A: D. Use Government provided AutoCAD Civil 3D 2013 drawing template (DWT), Figure Prefix Database, Linework Code Set to import survey points file and to import survey data and generate 3D surfaces. Naming utilities for original ground and final ground surfaces include project year, project I.D., abbreviated project name, OG (Original Ground), FG (Final Ground) (e.g., xx-xxx NDM OG_01 or xx-xxx NDM FG_01).

1. Use Government provided codes and special codes from Figure Prefix Database Manager and Linework Code Set when collecting topographic data points and importing survey data into drawing file. Refer to Government provided Linework Code Set for Special Codes, Line Segment Codes and Curve Segment Codes.

11. What I was wondering is if we could get a copy of the Government provided codes to see how we could implement them into the surveying?

A: The information will be provided to the successful offeror.

12. Is the contractor able to work 6-days per week?

A: Refer to Specifications Section 01 11 00 – Summary of Work and Specifications Section 01 14 10 – use of Site, Article 1.04.

13. Assuming approximately 40,000 cyds of material excavated for new drain is to be reused, plus additional 30,000 cyds excavated from borrow areas; total approximate cyds to be placed over top of new drain would be 70,000 cyds., correct?

A: Reference drawing 278-D-6003 for Government assumptions for Material Distribution.

14. The material excavated for the wetland mitigation area is to be spoiled and reclaimed in one of the borrow areas, correct?

A: Reference Specifications Section 31 23 39 – Disposal of Excavated Materials.

15. Do you anticipate any surface disturbance on the dam slope above the existing access road/bench? The drawings seem to indicate that al disturbance will occur at or below this area/elevation.

A: No disturbance to the dam crest, other than vehicular traffic is anticipated.

16. The Zone 3A Aggregate spec indicates a limestone product. Please clarify whether this needs to be a washed river gravel or limestone.

A: Reference Specifications Section 31 24 15 – Gravel Drain Material, Paragraph 2.01.C. and Paragraph E.

17. According to the contract documents the contractor will be required to have a Certified Industrial Hygienist for the project. It is not anticipated to encounter hazardous materials that would require such services. Will it be necessary to include the related costs for a CIH in the items of work, or would it be deemed unnecessary?

A: Refer to revised Specifications Section 01 35 30 – Contractor’s Onsite Safety Personnel included in Amendment 3.

18. In Section 03 30 00 (Concrete testing), it does not give a frequency for testing Density and Yield of the concrete. Does this indicate that these tests are not required?

A: Reference Specifications Section 03 30 00 – Cast-In-Place Concrete, Article 3.09 – Table 03 30 00D- Field Testing, “Fresh Concrete Properties – tests performed at site” is split between page 26 and 27. Testing frequency for test standard ASTM C138 is the same frequency as required for Fresh Concrete Properties.

19. For compressive strength testing of the cylinders, it says that 6”x12” cylinders should be cast. As a standard practice, we have followed industry standard and are now casting 4”x8” cylinders. We can cast and test the 6”x12” if necessary, but I was just wondering if we can use the 4”x8”.

A: It would be acceptable to use 4x8 cylinders. However, (3) 4x8 cylinders shall be cast for each location that only (2) 6x12 cylinders were specified. I.e. a minimum of 7 samples for strength testing shall be made. Test 3 cylinders at 7 days age and 3 cylinders at strength design age. Maintain last cylinder for testing in event that the strength design age test results fall below the required strength. Cast 3 additional field cured test cylinders during placement in adverse (hot or cold) weather.

Box Butte Dam Toe Drain Modification Amendment No. 003

Mirage Flats Project, Nebraska Solicitation No. R17PS00153

Submittals

Revised - 01 33 00 - 5

a. Revise and resubmit submittals not approved.

b. Do not change designs without approval of the CO after drawings, documentation, and technical data have been approved.

1.07 TRANSMITTAL

A. Addresses for codes listed in Table 01 33 00A - List of Submittals:

1. CO: Bureau of Reclamation, Attention: GP-5000, P.O. Box 36900, Billings, MT

59107-6900. Physical address: 2021 4th Avenue North, Billings, MT 59101.

2. COR: Bureau of Reclamation, Attention: GP-2600, P.O. Box 36900, Billings, MT 59107-6900. Physical address: 2021 4th Avenue North, Billings, MT 59101.

B. E-mail address for electronic submittals listed in Table 01 33 00A – List of Submittals:

sha-GPR-CONSTSVCS@usbr.gov

1. Submit electronic submittals that are too large for e-mail along with paper copy.

C. Submittals required by the specifications, but not listed in Table 01 33 00A – List of

Submittals:

1. Submit in accordance with this section.

2. Submit to COR, unless otherwise specified.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

Not Used mailto:sha-GPR-CONSTSVCS@usbr.gov

Revised - 01 33 00 - 6

Table 01 33 00A. - List of Submittals

* CO indicates Contracting Officer, and COR indicates Contracting Officer’s Representative.

RSN

Clause or

Section

Title

Submittals required

Due date or delivery time

Respon-sible code

Sets to be sent: *

CO COR

1 Performance and Payment

Bonds -

Construction

52.228-15

Performance and

Payment Bonds

Within 10 calendar days after award

CO 1

paper

2 Additional

Bond Security

52.228-02

Evidence of Increase in Bond Security

Within 10 calendar days after modifications increasing contract value

CO 1

paper

3 Insurance-

Work on a

Government

Installation

1452.228-70

1) Written certification that the required insurance has been obtained

2) Current certification of insurance for each subcontractor

Before commencing onsite work CO 1 paper

4 Liability

Insurance

1452.228-70

Acceptable

Certificate of

Liability Insurance

Prior to commencement of work under the contract

CO 1

paper

5 Deleted ------------------------- ---------------------------------------- -- ----- -

6 Equal

Opportunity

52.222-26

Information required by Executive Order

112246 (SF-100)

Within 30 days following award CO 1 paper

7 Reporting

Executive

Compensation and First Tier

Subcontract

Awards

52.204-10

Certification that executive compensation and subcontract awards were reported

Within 10 days of each report being submitted

CO 1

paper

8 Payrolls and

Basic Records

52.222-08

Copies of all payrolls

Weekly for each week of contract performance

COR 1

paper

2 paper

9 Site Security

GP-7 and

WBR

1452.237-80

List of contractor and subcontractor employees

At least 10 days prior to arriving at worksite

COR 0 2 paper

10 Site Security

GP-7 and

WBR

1452.237-80

List of vehicles and equipment to be brought onsite

At least 10 days prior to arriving at worksite

COR 0 2 paper

11 Employment

Verification

52.222-56 and

ET 02-20

Confirmation of

Enrollment as a

Federal Contractor in E-Verify

Within 30 days of contract award CO 1

Revised - 01 33 00 - 7

Table 01 33 00A. - List of Submittals

* CO indicates Contracting Officer, and COR indicates Contracting Officer’s Representative.

RSN

Clause or

Section

Title

Submittals required

Due date or delivery time

Respon-sible code

Sets to be sent: *

CO COR

12 Estimate of

Percentage of

Recovered

Material

Content for

EPA

Designated

Items

52.223-09

Documentation indicating the percentage of the total recovered material content for the EPA Designated

Items delivered and/or used in the contract performance

After completion of the work and prior to final payment

CO 1

paper

13 Release of

Claims

1452.204-70

Release of Claims

(DI-137) against the

Government

After completion of the work and prior to final payment

CO 1

paper

01 14 10-1 Use of Site Land Use and

Landscape

Rehabilitation Plan

At least 21 days before use of

Government land

COR 0 1 paper +

1 electronic

01 31 19-1 Project

Management and

Coordination

Work Plan Summary Within 21 days after receipt of

Notice to Proceed and Monthly thereafter

COR 0 1 paper +

1 electronic

01 32 10-1 Construction

Program

Representative

Information

Within 7 days after receipt of

Notice to Proceed

COR 1 2 paper

01 32 10-2 Construction

Program

Baseline Schedule

Within 21 days after receipt of

Notice to Proceed

COR 1

1 paper +

1 electronic

01 32 10-3 Construction

Program

Updated Schedule

Reports

Submit with monthly progress payment invoices.

01 32 10-4 Construction

Program

Time Impact

Analysis

Within 28 days after the CO directs a contract change, with any proposal for a future modification, with any value engineering proposal, or with any request or claim for an equitable adjustment to the contract.

01 35 10-1 Safety Data

Sheets

Complete LHM and

SDS

At least 21 days before jobsite delivery of hazardous material

COR 0 1 paper +

1 electronic

01 35 10-2 Safety Data

Sheets

Updated LHM and

SDS

At least 21 days before jobsite delivery of hazardous material not previously listed

COR 0 1 paper +

1 electronic

01 35 20-1 Safety and

Health

Safety Program Submitted and accepted before commencing on-site work. See section 3 of RSHS

COR 0 1 paper +

1 electronic

01 35 20-2 Safety and

Health

Monthly Accident

Summary Report

Within 5 days after the first of the month

COR 0 1 paper +

Revised - 01 33 00 - 8

Table 01 33 00A. - List of Submittals

* CO indicates Contracting Officer, and COR indicates Contracting Officer’s Representative.

RSN

Clause or

Section

Title

Submittals required

Due date or delivery time

Respon-sible code

Sets to be sent: *

CO COR

01 35 20-3 Safety and

Health

Respirator User

Documentation

At least 21 days before beginning on-site work

COR 0 2 paper

01 35 20-4 Safety and

Health

Crane Training

Certificates

At least 21 days before beginning on-site work

COR 0 2 paper

01 35 20-5 Safety and

Health

Other Training

Certificates

At least 21 days before beginning on-site work

COR 0 2 paper

01 35 30-1 Contractor’s

Onsite Safety

Personnel

Qualifications At least 21 days before beginning on-site work

COR 0 2 paper

01 35 30-2 Deleted ------------------------- ---------------------------------------- --- - - ----- -

01 35 30-3 Contractor’s

Onsite Safety

Personnel

Safety Inspection

Reports

Weekly COR 0 1 paper +

1 electronic

01 46 00-1 Quality

Procedures

Contractor Quality

Control Program

Within 14 days after Notice to

Proceed

COR 0 1 paper +

1 electronic

01 46 00-2 Quality

Procedures

Contractor’s Daily

Reports

Weekly COR 0 1 paper +

1 electronic

01 46 00-3 Quality

Procedures

Quality Control

Supervisor

Information

Within 14 days after Notice to

Proceed

COR 0 2 paper

01 46 00-4 Quality

Procedures

Contractor Quality

Testing Plan

Within 14 days after Notice to

Proceed

COR 0 1 paper +

1 electronic

01 46 00-5 Quality

Procedures

Summary Monthly

Test Results

Monthly COR 0 1 paper +

1 electronic

01 46 20-1 Testing

Agency

Services

Testing Agency

Services Plan

At least 21 days before beginning construction

COR 0 1 paper +

1 electronic

01 51 00-1 Temporary

Utilities

Diversion Facility and Water

Withdrawal

Information

At least 28 days before beginning water withdrawal

COR 0 1 paper +

1 electronic

01 55 00-1 Vehicular

Access and

Parking

Access Roads and

Haul Routes Plan

At least 28 days before beginning onsite work

COR 0 1 paper +

1 electronic

01 55 00-2 Vehicular

Access and

Parking

Preconstruction

Video

At least 21 days before beginning onsite work

COR 0 1 DVD

01 55 00-3 Vehicular

Access and

Parking

Post Construction

Video

Within 7 days of completing recording

COR 0 1 DVD

01 55 00-4 Vehicular

Access and

Parking

Post Repair Video Within 7 days of completing recording

COR 0 1 DVD

Contractor’s Onsite Safety Personnel

Revised - 01 35 30 - 1

SECTION 01 35 30

CONTRACTOR’S ONSITE SAFETY PERSONNEL

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Cost:

1. Include in prices offered in the Price Schedule for the other items of work.

1.02 REFERENCE STANDARDS

A. Bureau of Reclamation (USBR)

1. RSHS Reclamation Safety and Health Standards.

http://www.usbr.gov/ssle/safety/RSHS/rshs.

html

1.03 SUBMITTALS

A. Submit the following in accordance with Section 01 33 00 - Submittals.

B. RSN 01 35 30-1, Qualifications:

1. Contractor’s Onsite Safety Representative.

2. Deleted.

C. RSN 01 35 30-2, Deleted.

1. Deleted.

a. Deleted.

2. Deleted.

a. Deleted.

3. Deleted.

4. Deleted.

5. Deleted.

D. RSN 01 35 30-3, Safety Inspection Reports:

1. Prepare detailed weekly safety inspection reports listing noted deficiencies, digital photos, abatement dates and follow-up action for all jobsite activities.

2. Base inspection report on findings of jobsite walk-through with Government personnel.

Revised - 01 35 30 - 2

1.04 QUALIFICATIONS

A. Contractor’s Onsite Safety Representative:

1. Competent supervisory employee with safety and health related training, experience and duties on similar construction products. Certification indicating completed OSHA authorized 30 hour course for construction. Course shall be completed within last 5 years.

2. Include resume, description of safety representative responsibilities on similar construction projects, and copies of training certifications of the individual proposed as the onsite safety representative.

3. The safety representative shall be acceptable to the COR and can have other duties.

B. Deleted.

1. Deleted.

2. Deleted.

1.05 APPLICATION

A. Contractor’s Onsite Safety Representative authorities, duties, and responsibilities:

1. Responsible for effectively implementing the Contractor’s Safety Program.

2. The Safety Representative shall coordinate all emergency response activities.

3. Recommend controls for observed hazards or predicted hazards.

4. Full authorization to correct unsafe acts on the spot, including the authority to stop work to correct safety and health problems.

5. Lead weekly safety meetings at the jobsite.

6. Onsite, at the point of work, during any and all construction activities.

7. Assemble, review, and sign each Job Hazard Analysis (JHA).

8. Verify the correct use of respiratory protection and personal protective equipment.

9. Conduct and prepare weekly safety inspections in conjunction with the onsite government representative listing noted deficiencies, their abatement dates, follow up action. The report shall be available for review onsite.

10. Provide direct oversight and assemble a detailed report of all incident reviews, near-misses, accidents, and emergency response or rescue actions.

11. Deleted.

12. Deleted.

a. Deleted.

b. Deleted.

c. Deleted.

Revised - 01 35 30 - 3

d. Deleted.

e. Deleted.

f. Deleted.

g. Deleted.

h. Deleted.

i. Deleted.

j. Deleted.

1.06 QUALITY ASSURANCE

A. Contractor’s Onsite Safety and Health Representative:

1. The effectiveness of the Contractor’s Onsite Safety Representative in prosecuting the safety program will be subject to continued review and approval by the CO.

2. Should the Contractor’s onsite safety representative’s effort be deemed insufficient the Contractor may be required to provide the services of a qualified, full-time safety professional at no additional cost to the Government.

B. Deleted.

1. Deleted.

2. Deleted.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

Not Used

END OF SECTION

Revised - 01 35 30 - 4

This page intentionally left blank.

Cast-In-Place Concrete

Revised - 03 30 00 - 27

Table 03 30 00D- Field Testing

TESTS OF TEST

STANDARD

STANDARD TITLE TESTING FREQUENCY

ASTM C138 Density (Unit

Weight), Yield, and

Air Content

(Gravimetric) of

Concrete

Compressive

Strength, ASTM C31

ASTM C39

Making and Curing

Concrete Test

Specimens in the Field

Compressive Strength of Cylindrical

Concrete Specimens

1 set of samples (6-inch by 12-inch or 4-inch by 8-inch cylinders) for each day of placement for each mixture for the first 50 or less cubic yards, and 1 set of samples for each additional

100 cubic yards of concrete. A minimum of 5 samples for 6-inch by 12-inch cylinders or 7 samples for 4-inch by 8-inch cylinders for strength testing shall be made each time strength samples are collected.

2 additional 6-inch by 12-inch or 3 additional

4-inch by 8-inch field cured test cylinders during placement in adverse (hot or cold) weather. Cure these samples on jobsite under same conditions as concrete the cylinders represent for minimum of 7 days, then transfer to testing laboratory until testing at strength design days.

Test (2) 6-inch by 12-inch or (3) 4-inch by 8-inch cylinders each at 7 days age and (2) 6-inch by 12-inch or (3) 4-inch by 8-inch cylinders at strength design age. Maintain last cylinder for testing in event that the strength design age test results fall below the required strength.

Concrete Cores ASTM C42 Obtaining and Testing

Drilled Cores and

Sawed Beams of

Concrete

At discretion of the Government when cylinder strengths fail to meet minimum requirements.

The Contractor shall obtain core specimens in accordance with ASTM C42 at locations directed by COR, at no additional cost to the

Government. The Contractor shall repair the core holes in accordance with USBR M-47 as directed by COR

A. Acceptance Criteria:

1. Cylinder Compressive Strength:

a. In accordance with ASTM C94, except as follows:

1) 90 Percent of test cylinders exceed specified compressive strength at design age.

Revised - 03 30 00 - 28

2) Average compressive strength of six consecutive test cylinders exceeds specified compressive strength at design age.

3) No individual strength test falls below specified compressive strength by more than 500 lb/in2.

2. Drilled Concrete Cores:

a. Concrete in placement represented by core tests will be considered structurally adequate when average compressive strength of three cores is equal to at least 85 percent of specified compressive strength and no single core has a compressive strength of less than 75 percent of specified compressive strength.

b. Concrete in placement represented by core tests will be considered adequate for durability when average compressive strength of three cores is equal to at least 100 percent of specified compressive strength at design age.

3.10 PROTECTION

A. Protect concrete from damage until final acceptance by Government.

1. Do not load, remove forms or shoring, or backfill against concrete until concrete has gained sufficient strength to safely support its weight and imposed loads.

2. Protect fresh concrete against erosion from rain, hail, sleet, or snow;

contamination from foreign materials; and damage from foot traffic until the concrete has hardened.

3. Protect concrete from heavy foot traffic and other construction activities by covering with plywood or other suitable material. Remove and dispose of temporary covering when no longer required.

B. Protect concrete when freezing temperatures are imminent.

1. Maintain concrete at a temperature of 50 degrees Fahrenheit (10 degrees Celsius) or greater for 72 hours, minimum, after placement. Vent heater and prevent concrete from drying where artificial heat is employed.

2. Protect concrete from freezing during water curing. After discontinuance of water curing, maintain at a temperature of 50 degrees Fahrenheit (10 degrees Celsius) or greater for next 72 hours.

3. Discontinue protection against cold weather such that the drop in temperature of the concrete will be gradual and will not exceed 5 degrees Fahrenheit per hour and 40 degrees Fahrenheit in 24 hours.

3.11 REPAIR

A. Repair concrete in accordance with USBR M-47.

B. Use repair or replacement method directed by COR.

Revised - 03 30 00 - 29

3.12 FINISH, SURFACE TOLERANCES, AND CURING SCHEDULES

Table 03 30 00F - Formed Surfaces

Surface Finish Maximum

Allowable

Tolerances

Acceptable Curing

Methods

Surfaces upon or against which fill material will be placed

F1 T1 Water, White ASTM C309 Class

A or B curing compound for horizontal surfaces, and

White ASTM C309, Class

B curing compound for vertical or sloped surfaces.

Surfaces not permanently concealed by fill material or concrete where appearance is not critical

F2 T3 Water, White ASTM C309 Class

A or B curing compound for horizontal surfaces, and

White ASTM C309, Class

B curing compound for vertical or sloped surfaces.

Inspection well and metering weir structures

F2 T3 Water, White ASTM C309 Class

A or B curing compound for horizontal surfaces, and

White ASTM C309, Class

B curing compound for vertical or sloped surfaces.

Construction joints and surfaces to be covered by grout

F1 T3 Water

White, ASTM C309 Class

A curing compound

Contraction joints F2 T3 White ASTM C309 Class

A curing compound

Control joints F2 T2 White ASTM C309, Class

A curing compound

Revised - 03 30 00 - 30

Table 03 30 00G - Unformed Surfaces

Surface Finish Maximum

Allowable

Tolerances

Acceptable Curing

Methods

Surfaces to be covered by fill material or concrete

U1 T1 White ASTM C309 Class

A or B curing compound for horizontal surfaces, and

White ASTM C309, Class

B curing compound for vertical or sloped surfaces

Surfaces to be covered by grout

Equipment Supports

U1 T1 Water, White ASTM C309 Class

A or B curing compound for horizontal surfaces, and

White ASTM C309, Class

B curing compound for vertical or sloped surfaces

Tops of walls not prominently exposed to public view

U2 T3 White ASTM C309 Class

A or B curing compound

Polyethylene film or White

Burlap-polyethylene sheet

Tops of walls prominently exposed to public view

U2 T3 ASTM C1315 Class A

Clear curing compounds, water-emulsified resin-base

Floors of instrumentation wells and metering weirs

U2 T3 Water

Polyethylene film

END OF SECTION