W911KB-16-T-0018-0001.pdf

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

Subject solicitation entitled “Chena Steel Pipe Casing, Riser Pipe, and Steel Drive Point Ends for Chena River Lakes Project, North Pole Alaska” is hereby amended as follow s:

A. The follow ing pages are hereby superceded by the attached revised pages and addendums to the solicitation.

B. Page 1, SF1449, Section SF1449 – Continuation Sheet, Q&A (1 page) and Specifications (9 pages). See Summary of Changes for detailed information.

C. The closing time for receipt of quotations is hereby extended to 2:00 p.m. Alaska Time, 7 September 2016.

Point of contact for this amendment is Mr. Woods 907-753-2547.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 3

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

16C. DATE SIGNED

BY 01-Sep-2016

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 W911KB-16-T-0018

X 9B. DATED (SEE ITEM 11)

27-Jul-2016

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 X is extended, 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 1 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

01-Sep-2016

CODE

U.S. ARMY ENGINEER DISTRICT, ALASKA

CEPOA-CT-SP

PO BOX 6898

JBER AK 99506-0898

W911KB 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

SEE ADDENDUM

(No Collect Calls)

W911KB-16-T-0018 27-Jul-2016

b. TELEPHONE NUMBER

9077535690

8. OFFER DUE DATE/LOCAL TIME

02:00 PM 07 Sep 2016

5. SOLICITATION NUMBER 6. SOLICITATION ISSUE DATE

AUTHORIZED FOR LOCAL REPRODUCTION

PREVIOUS EDITION IS NOT USABLE

STANDARD FORM 1449 (REV. 2/2012)

Prescribed by GSA – FAR (48 CFR) 53.212

(TYPE OR PRINT)

(SIGNATURE OF CONTRACTING OFFICER)

ADDENDA X ARE

26. TOTAL AWARD AMOUNT (For Gov t. Use Only )

23.

CODE 10. THIS ACQUISITION IS

SUCH ADDRESS IN OFFER

17b. CHECK IF REMITTANCE IS DIFFERENT AND PUT

BELOW IS CHECKED

TELEPHONE NO.

W911KB9. ISSUED BY

18b. SUBMIT INVOICES TO ADDRESS SHOWN IN BLOCK 18a. UNLESS BLOCK

7. FOR SOLICITATION

INFORMATION CALL:

a. NAME

ERIK R BABB

2. CONTRACT NO. 3. AWARD/EFFECTIVE DATE 4. ORDER NUMBER

(TYPE OR PRINT)

30b. NAME AND TITLE OF SIGNER 30c. DATE SIGNED 31b. NAME OF CONTRACTING OFFICER

30a. SIGNATURE OF OFFEROR/CONTRACTOR 31a.UNITED STATES OF AMERICA

1 27a. SOLICITATION INCORPORATES BY REFERENCE FAR 52.212-1. 52.212-4. FAR 52.212-3. 52.212-5 ARE ATTACHED.X

25. ACCOUNTING AND APPROPRIATION DATA

1. REQUISITION NUMBER

20.

ADDITIONAL SHEETS SUBJECT TO THE TERMS AND CONDITIONS SPECIFIED.

OFFEROR TO COMPLETE BLOCKS 12, 17, 23, 24, AND 30

SOLICITATION/CONTRACT/ORDER FOR COMMERCIAL ITEMS

ARE NOT ATTACHED

27b. CONTRACT/PURCHASE ORDER INCORPORATES BY REFERENCE FAR 52.212-4. FAR 52.212-5 IS ATTACHED. ADDENDA ARE ARE NOT ATTACHED

(BLOCK 5), INCLUDING ANY ADDITIONS OR CHANGES WHICH ARE

SET FORTH HEREIN, IS ACCEPTED AS TO ITEMS:

. YOUR OFFER ON SOLICITATION

28. CONTRACTOR IS REQUIRED TO SIGN THIS DOCUMENT AND RETURN

% FOR:SET ASIDE:UNRESTRICTED OR X

SMALL BUSINESSX

WOMEN-OWNED SMALL

BUSINESS (WOSB)

17a.CONTRACTOR/ CODE FACILITY

OFFEROR CODE

U.S. ARMY ENGINEER DISTRICT, AK

CEPOA-CT (W911KB)

PO BOX 6898

JBER AK 99506-0898

18a. PAYMENT WILL BE MADE BY CODE

RATED ORDER UNDER

DPAS (15 CFR 700)

13a. THIS CONTRACT IS A

13b. RATING

CODE15. DELIVER TO CODE 16. ADMINISTERED BY

SEE SCHEDULE

12. DISCOUNT TERMS11. DELIVERY FOR FOB DESTINA-

TION UNLESS BLOCK IS

MARKED

SEE SCHEDULE

14. METHOD OF SOLICITATION

RFQ IFB RFPX

FAX:

TEL: SERVICE-DISABLED

VETERAN-OWNED

SMALL BUSINESS

8(A)

HUBZONE SMALL

BUSINESS

ECONOMICALLY DISADVANTAGED

WOMEN-OWNED SMALL BUSINESS

(EDWOSB)

SIZE STANDARD:

1000 EM

NAICS:

331210

X

OFFER DATED

29. AWARD OF CONTRACT: REF.

DELIVER ALL ITEMS SET FORTH OR OTHERWISE IDENTIFIED ABOVE AND ON ANY

COPIES TO ISSUING OFFICE. CONTRACTOR AGREES TO FURNISH AND

EMAIL:

TEL:

31c. DATE SIGNED

SEE SCHEDULE

SCHEDULE OF SUPPLIES/ SERVICESITEM NO. QUANTITY UNIT UNIT PRICE AMOUNT

24.22.21.19.

W911KB-16-T-0018

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

SECTION SF 1449 - CONTINUATION SHEET

SUPPLIES OR SERVICES AND PRICES

CLIN 0001

The CLIN extended description has changed from U.S. Made Steel Casing: 24” diameter, 3/8” wall, 50 foot sections (4 each) 200 Lineal Feet to be delivered FOB Destination to:U.S. Army Engineer District, AlaskaChena River Lakes Project - Tim Feavel 907-488-27483800 Laurance RoadNorth Pole, Alaska 99705 to U.S. Made Steel Casing: 24” diameter, 3/8” wall, ASTM A 53/A 53 M, 40 foot sections (4 each) and 10 foot sections (4 each) = 200 Lineal Feet to be delivered FOB Destination to:U.S. Army Engineer District, AlaskaChena River Lakes Project - Tim Feavel 907-488-27483800 Laurance RoadNorth Pole, Alaska 99705.

The following have been added by full text:

QUESTIONS BY CONTRACTORS AND ANSWERS (Q&A)

Q1: 24" pipe - if needed to make a 50' piece is it ok to weld 2 pieces together? And can ends of 50' pipe be square cut or do they need to be beveled? Or does it matter?

A1: They can be welded to make 50 footers, however, shipping 50’ sections might be very expensive. Additionally, we do not have a welding specification. Cut square would be preferred. See Q5: and A5: below.

Q2: 12" pipe - square cut ends or beveled ends?

A2: 12” pipe would be nice pre-beveled.

Q3: The conical points - ship loose with the pipe?

A3: Points may be shipped loose. Be sure to send spec sheets.

Q4: Mild carbon steel material acceptable for the pipe?

A4: Pipe specifications are ASTM A 53, grade B. See attached Specifications.

W911KB-16-T-0018

Q5: “We can only get pipe in DRLs (double random lengths) that run between 38-42 foot lengths. We could procure 5 each of 40 foot sections. Would that be acceptable?

Please advise.”

A5: 5 each 40' sections OR 4 each 40’ sections and 4 each 10’ sections will work and we can weld them in the field.

(End of Summary of Changes)

SECTION 33 26 00.00 10

RELIEF WELLS

04/08

PART 1 GENERAL

1.1 UNIT PRICES

1.1.1 Relief Wells

1.1.1.1 Payment

Payment will be made for costs associated with relief wells. Price shall constitute full compensation for construction of relief wells. Wells ordered abandoned by the Contracting Officer before installation of well screen and riser due to no fault of the Contractor will be paid for at apercentage of the contract unit price per linear foot, for Bid Item No.

"Relief Wells". Wells ordered abandoned by the Contracting Officer due to no fault of the Contractor will be paid for at the full contract unit price for Bid Item "Relief Wells". No payment will be made for placement or replacement of temporary casings or repair of damage resulting from Contractor operations. No separate payment will be made for relief well screen, riser, bentonite, filter pack, development, and backfill. No payment will be made for any wells that, in the opinion of the Contracting Officer, are abandoned due to Contractor fault or neglect.

1.1.1.2 Measurement

Relief wells will be measured for payment by each completed relief well.

1.1.1.3 Unit of measure

Unit of measure: each

1.2 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.

ASME INTERNATIONAL (ASME)

ASME B1.20.1 (1983; R 2006) Pipe Threads, General Purpose (Inch)

ASME B1.20.2M (2006) Pipe Threads, 60 Deg. General Purpose (Metric)

ASME B31.9 (2008) Building Services Piping

ASTM INTERNATIONAL (ASTM)

ASTM A 312/A 312M (2009) Standard Specification for Seamless, Welded, and Heavily Cold Worked

Austenitic Stainless Steel Pipes

ASTM A 53 (2004) Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A 53/A 53M (2010) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM C 136 (2006) Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

ASTM C 33/C 33M (2008) Standard Specification for Concrete Aggregates

ASTM C 387/C 387M (2010) Standard Specification for Packaged, Dry, Combined Materials for Mortar and Concrete

ASTM D 75/D 75M (2009) Standard Practice for Sampling Aggregates

ASTM E 11 (2010a) Wire Cloth and Sieves for Testing Purposes

1.3 SUBMITTALS

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

submittals not having a "G" designation are for [Contractor Quality Control approval.][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 Section 01 33 00

SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Shop Drawings;G

SD-03 Product Data

Filter Pack;G

SD-06 Test Reports

Tests

1.4 QUALITY ASSURANCE

The requirements listed herein form a part of this specification to the extent referenced.

1.4.1 Shop Drawings

Show details of the proposed methods for drilling, coupling well screen and riser sections together, placement of centralizers, installing the well screen and riser, and limit(s) of backfilling. Show on the shop drawings the type of screen and size; slot size, shape and pattern; bottom plug material; and installation detail. The riser pipe and well discharge details shall also be shown on the shop drawings. Any Contractor-proposed substitutes or alternates in material construction details or methods must be presented in the shop drawings. No phase of the work shall be initiated until all shop drawings concerning that activity have been approved.

1.4.2 Depth of Well

The length of well screen, length of riser pipe and the well discharge elevation shall conform to the elevations established in the field by the Contracting Officer. The maximum well depth will not exceed 102 feet.

1.5 PROJECT/SITE CONDITIONS

1.5.1 Location

The exact location of each well, with respect to the toe of the embankment, will be determined in the field by the Contracting Officer.

1.5.2 Obstructions Encountered

If obstructions are encountered in the foundation which, in the opinion of the Contracting Officer, render it impracticable to complete the well to the directed depth, the Contracting Officer may adjust the depth.

Alternatively, the Contracting Officer may direct the Contractor to abandon the well, plug the hole by backfilling with approved material by an approved procedure, and construct another well at an adjacent site.

PART 2 PRODUCTS

2.1 WELL SCREEN

Well screen shall be of the type and dimensions indicated in the plans and specifications. Screen openings shall be uniform in size and pattern, and shall be spaced approximately equally around the circumference of the pipe.

2.1.1 Stainless Steel Well Screen

Stainless steel well screen of the type and dimensions indicated in the plans will be furnished by the Government and located at the Chena Project office staging yard. The length of each well screen section is 22.5 feet.

Once screens are removed from the storage yard, the contractor is responsible for any damage to the screens and shall replace any damaged screens. The well screen and fittings shall be fabricated entirely from stainless steel conforming to ASTM A 312/A 312M, Type 304, 304-L, 316 or 316-L. The well screen shall be of stainless steel with a keystone wire-wrapped continuous slot strainer.

2.1.1.1 Couplings

Couplings for the stainless steel well screen shall consist of the same material as the well screen and shall be threaded, flanged, and/or fitted with a welding ring. The couplings shall conform in design to the couplings recommended by the manufacturer of the well screen.

2.1.1.2 Perforations

The 12 inch diameter well screen shall have a number 20 slot, 0.02 inch open slot.

2.1.2 Bottom Screen Cap

The bottom screen cap for each well shall be made of the same material as the well screensand at least the same minimum thickness as the riser pipe.

Bottom screen caps shall be welded to the bottom of the screen.

2.2 RISER PIPE

Steel riser pipe shall consist of ASTM A 53, grade B pipe with 0.330 inch wall thickness. The relief well riser pipe material and method of manufacture shall conform to the requirements specified in paragraph WELL SCREEN, except that the screen perforations or opening shall be omitted.

The relief well riser pipe diameter and discharge details shall be as shown. Couplings to the well screen and between riser pipe sections shall be as specified in paragraph COUPLING.

2.3 FILTER PACK

Submit proposed filter pack material and its gradation, before it is placed. Material for the filter pack around the riser pipes and screens shall be a washed gravel and washed sand composed of hard, tough, and durable particles free from adherent coating. The filter pack shall not be crushed stone. The filter pack material shall contain no detrimental quantities of organic matter nor soft, friable, thin, or elongated particles in accordance with the quality requirements in ASTM C 33/C 33M, Table 1 and Table 3, Class 5S, and in ASTM E 11, Table 1. The filter pack shall meet the following gradation requirements:

SIEVE SIZE PERCENT PASSING BY WEIGHT

1/2" 100 No. 4 70-90 No. 10 5-50 No. 40 0-10 No. 200 0-1.5

PART 3 EXECUTION

3.1 DRILLING

Wells may be drilled by the reverse rotary circulation method or other method approved, which will insure proper placement of the well screen, riser pipe, and filter pack. Methods which involve radical displacement of the formation, or which may reduce the yield of the well, will not be permitted. Excavated material shall be disposed of as directed.

3.1.1 Reverse Circulation Method

If the reverse circulation method is used for drilling wells, remove all of the drilling fluid from the filter pack and the natural pervious formation. If in the opinion of the Contracting Officer the walls of the hole above the top of the filter pack require support during development operations, place a temporary casing similar to that specified in paragraph

TEMPORARY CASING. The diameter of the hole shall be such as will permit the placement of the minimum thickness of filter pack as specified in paragraph FILTER PACK PLACEMENT. The drilling fluid shall be a suspension of fine grained soil or shall be a commercial product of a recognized manufacturer, shall be approved by the Contracting Officer, and shall have the characteristic of being readily removable from the filter pack and the walls of the formation by development as specified in paragraph DEVELOPMENT. The use of bentonite will not be permitted.

3.1.2 Temporary Casing

Temporary well casing of either iron or steel of sufficient length to case to the bottom of all borings shall be available at the construction site.

The temporary casing, shall have an inside diameter of not less than 24 inches, shall have sufficient thickness to retain its shape and maintain a true section throughout its depth, and may be in sections of any convenient length. The temporary casing shall be such as to permit its removal without disturbing the filter pack, riser, or well screen. The setting of temporary casing shall be such that no cavity will be created outside of it at any point along its length. In the event the temporary casing should become unduly distorted or bent it should be discarded and a new casing should be used during installation of any additional relief wells.

3.2 INSTALLATION OF RISER PIPE AND SCREEN

3.2.1 Assembly

All riser pipe and screen shall be in good condition before installation and all couplings and other accessory parts shall be securely fastened in place. The successive lengths of pipe shall be arranged to provide accurate placement of the screen sections in the bore hole. [The riser-pipe shall be provided with an approved cap and a flanged top section, the top of which shall be set at the elevation directed or shown.] Centralizers shall be attached to the assembled riser pipe and screen in such numbers and of a type that they will satisfactorily center the riser pipe and screen in the well and will hold it securely in position while the filter pack material is being placed.

3.2.2 Joints

Sections of relief well pipe shall be joined together as specified in paragraph COUPLINGS. Joints shall be designed and constructed to have the strength of the pipe and where possible a strength capable to support the weight of the relief well stem as it is lowered into the hole. When not practicable to construct joints that will support the weight of the relief well stem, the stem shall be supported at the lower end by any approved means that will assure that the joints do not open while being lowered into place in the well.

3.2.3 Installation

The assembled riser pipe and screen shall be placed in the bore hole in such manner as to avoid jarring impacts and to insure that the assembly is centered and not damaged or disconnected. The screen should be suspended in the hole and not resting on the bottom of the hole. After the screen and riser pipe have been placed, a filter pack shall be constructed around the screen section as specified in paragraph FILTER PACK PLACEMENT and the well developed as specified in paragraph DEVELOPMENT. The top of the riser pipe shall be held at the designated elevation during placement of the filter pack.

3.2.4 Check for Plumbness and Alignment

a. Each well shall be sufficiently straight and plumb, such that a cylinder 10 feet in length and with an outside diameter 1/2 inch smaller than the inside diameter of the well may be lowered for the full depth of the well and withdrawn without binding against the sides of the well.

Furnish the dummy cylinder and perform the alignment check and plumbness check in the presence of the Contracting Officer. A variation of 6 inches per 100 feet of depth will be permitted in the plumbness of well from a plumb line at the top of the well; however, this will not relieve the Contractor of the responsibility of maintaining adequate clearance for installation of the surging and pumping equipment required for testing and pumping the wells. At least one plumbness check and alignment check shall be performed on each well after placement of the filter pack. Additional tests may be made during the performance of the work at the option of the Contractor.

3.2.4.1 Alignment

Test the alignment by lowering into the well a section of cylinder 10 feet long or a dummy of the same length. The outside diameter of cylinder shall be not more than 1/2 inch smaller than the inside diameter of the well.

Should the cylinder fail to move freely throughout the length of the well, the alignment of the well shall be corrected at no additional expense to the Government.

3.3 FILTER PACK PLACEMENT

After the well screen and riser pipe have been installed, the filter pack material shall be placed by tremie, when using a well graded material, in an approved manner such that segregation will not occur. The material should be placed around all sides of the screen to assure that the screen is not pushed against the side of the bore hole causing the screen to come in contact with foundation material or prevent the proper thickness of filter from being placed uniformly around the screen. The filter pack shall have a minimum thickness of 6 inches between the outside of the well screen and the natural formation. The filter pack shall be placed at a constant rate from the start of placement until it has reached the elevation shown. A double string of tremie pipe shall be used. The pipes shall be placed on opposite sides of the screen and/or casing, that is, 180 degrees apart, and shall be guided in such a manner that they will remain in this position throughout the placing process. The tremie pipes shall be set in place, filled completely with filter pack prior to being lifted off the bottom of the hole. The filter pack in the tremie pipe shall be kept a minimum of 1 foot above the water surface in the well throughout the placing process. In no case shall the gradation of the filter pack fall outside of the range specified in paragraph FILTER PACK.

3.4 DEVELOPMENT

Following placement of filter pack materials, develop the relief well by jetting, surging, intermittent pumping, or other approved methods as may be necessary to give the maximum yield of water per 1 foot of drawdown. At the time of development of any relief well, the well shall be free of drawdown or surcharge effects due to pump testing, developing or drilling at another location. The Contractor is responsible for maintaining at the relief well the needed access and work area and clearance in the relief well necessary to accomplish development. Furnish, install, or construct the necessary discharge line and troughs to conduct and dispose of the discharge a sufficient distance from the work areas to prevent damage.

Development shall be conducted to achieve a stable well of maximum efficiency and shall be continued until a satisfactory sand test, as specified in paragraph SAND TEST, is obtained. As development proceeds, filter pack material shall be added to the annular space around the screen to maintain the top elevation of the filter pack to the specified elevation. Provide an open tube or other approved means for accurately determining the water level in the well under all conditions. If, at any time during the development process it becomes apparent in the opinion of the Contracting Officer that the well may be damaged, development operations shall be immediately terminated. The Contracting Officer may require a change in method if the method selected does not accomplish the desired results. All materials pulled into the well by the development process shall be removed prior to performing the pumping test.

a. Intermittent pumping shall be performed by pumping the well at a capacity sufficient to produce a rapid drawdown of approximately 30 feet stopping the pump (backflow through pump will not be permitted) to permit the water surface to rise to its former elevation, and repeating this procedure. Cycle time for this procedure will vary as directed but will not be more than 3 cycles per minute. A pump discharge in excess of 3000gpm will be required. A deep well turbine pump, or electric submersible pump with check valve, shall be used with any attachment necessary to accomplish rapid starting and stopping for intermittent pumping. The intake shall be set at the bottom of the well. Prior to commencing intermittent pumping, and periodically during development by this method, all sand and/or other materials shall be removed from inside the screen. The amount of drawdown may be decreased if, in the opinion of the Contracting Officer, the efficiency of the well might otherwise be impaired.

3.5 BACKFILLING

After the well has been developed, additional filter pack should be added if necessary to meet the requirements of paragraph FILTER PACK PLACEMENT.

Then the annular space above the filter pack, shall be backfilled with hydrated bentonite chips and soil backfill as indicated on the plans.

3.6 TESTS

3.6.1 Pump Test

Upon completion but before acceptance, each well shall be subjected to a pump test of which a sand test will form a part. Provide a pump, capable of producing the specified drawdowns over periods of time sufficient to satisfactorily perform the pump test specified herein. The intake shall be set 10 feet below the maximum expected drawdown in the well. The amount of sand should be measured after each test. The pump shall be complete with either gasoline, diesel, or electric motor of adequate size. In case an electric motor is used, provide, without additional cost to the Government, the electric power and the necessary wiring. Provide an open tube or other approved means for accurately determining the water level in the well.

Furnish and install an orifice meter of approved design or other approved equipment for the purpose of measuring the discharge from the well during the pumping test. Furnish, install, or construct the necessary pipe discharge line, troughs, or ditches necessary to dispose of the pumping test discharge a sufficient distance from the work area to prevent damage.

Test each well by pumping continuously for a minimum of 6 hours. Prior to starting the pump test all material shall be removed from the bottom of the well. The pumping shall be at a rate of 1,200 gpm sufficient to produce approximately 5 feet of draw-down. If the test is interrupted, other than by order of the Contracting Officer, prior to the completion of the specified period of continuous operation, the test shall be re-run. In addition to the required pumping test, the Contracting Officer may direct the Contractor to perform additional pump tests. Such additional testing shall conform in general to the requirements specified herein except that the duration of the tests and the approximate draw-down will be determined by the Contracting Officer. In the event that sand or other material collects in the well as a result of the pump test, accurate measurements shall be taken as to the quantity of material in the well and all such material shall be removed. Upon completion of the pump test, remove all equipment, discharge lines, electrical lines, lumber, and debris, and shall backfill any excavated areas with impervious material.

3.6.2 Sand Test

As part of each Pump Test or at the end of each intermittent pumping a determination of the amount of sand (filter pack and/or foundation material) a well is producing shall be performed. Prior to starting the sand test all material shall be removed from the bottom of the tailpipe.

Test each well by pumping at a rate of 1,200gpm sufficient to produce approximately 5 feet of draw-down. After the pump is at the desired pumping rate the flow from the discharge shall be diverted into a container that will collect all the sand being carried by the water orthrough a Rossum Sand Tester. Development of the well is satisfactory if the amount of sand collected is less than 1 pint per 25,000 gallons of water pumped at the specified rate. Upon completion of the test the amount of sand in the tailpipe shall be determined to verify that no material is being deposited in the bottom of the well.

3.6.3 Filter Pack Sampling and Testing

Verify that all materials conform to the specifications before delivery to the project. The particle size distribution of the filter pack shall be sampled and tested in accordance with ASTM C 136 and ASTM D 75/D 75M.

Prior to delivery to the project site, at least two samples of material should be collected and tested for every 750 tons (2000 lb) produced under this contract. There shall be at least one particle size distribution test on the filter pack for each well.

3.6.4 Reports

Include in the reports for each relief well, logs of the boring, elevations of the well screen, top of riser pipe, bottom of the tailpipe, filter pack gradation, quantity of filter pack added during development, pump test, sand test, and report of backfilling. The elevation of changes between materials on these logs shall be to the nearest 0.1 foot. The log of backfill material shall include the filter pack particle size distribution test data, and notes concerning installation and development of the relief well. The pump test log shall include the duration of the test and rate of flow in gpm, and the draw-down response data with time in the pumped well, in adjacent wells, and in nearby piezometers. The relief well log and the pump test log shall be submitted to the Contracting Officer as part of the weekly quality control report specified in Section 01 45 00.00 10 QUALITY

CONTROL.

-- End of Section --