Amendment_2.pdf

Amendment 2 Yakama Test Well

4. Delete Page 2 of the Site Location Drawings and replace with Well Construction Plan attached.

5. All other items remain the unchanged.

A-3 SCHEDULE OF ITEMS

Quoters are required to submit quotes on all Schedule Items. The Government may make award on Item numbers 1 and 2 and may award Item number 3 at initial award. The Government will determine whether to authorize the construction of the Optional Well, based on pump test results as described in Section C-2 SCOPE OF WORK and as determined to be in the best interest of the Government.

SCHEDULE ITEMS:

Item no.

Item Description

Quantity

Unit of Measure

Unit Price

Total

0001 Mobilization/Demobilization 1 LS $ $ 0002 10-inch Test Well Drilling 400 LF* $ $ 0003 10-inch Optional Well Drilling 400 LF* $ $

GRAND TOTAL $

* Indicates Estimated Quantity. All other Units of Measure are Actual Quantity LS = Lump Sum

LF = Linear Feet

Authorized Signature Date

A-4 REQUIRED ADDITIONAL INFORMATION

DUNS Number: __________________________

TIN: __________________________

Cage Code(s): __________________________

Authorized Signatory: __________________________

Signature: __________________________

Email Address(es): __________________________

Office Phone Number: __________________________ Cell Phone Number: __________________________

A-7 ACCEPTANCE/AWARD OF SOLICITATION ITEMS

The Government reserves the right to make award on any item or group of items. In no event shall the award of this solicitation result in multiple awards.

The Government anticipates award of Base Items or Base plus Additive Items, depending on what size well is in the best interest to the Government.

C-1 PROJECT DESCRIPTION

The contractor shall furnish all labor, personnel, material, equipment, tools, appliances, supplies, services, permits, insurance, supervision and facilities to construct a 10-inch diameter test well and, potentially, an additional 10-inch optional well to serve the White Swan Community on the Yakama Indian Reservation. The wells are anticipated to be approximately 400 feet. Work shall be in accordance with scope of work, drawings, and specifications referenced as attachments in Section J and all other requirements included in this solicitation, amendments, and resultant contract.

C-2 SCOPE OF WORK

The facility improvements include drilling a 10-inch well(s), casing(s), surface seal(s)/grouting, well screens and well development and capacity testing over a 24-hour period. The construction services are all new construction.

Base Award Items shall be constructed and depending on the production (indicated by the pump test) of the base award

Yakama Test Well Page 3 of 29 test well, the COR will determine whether the Optional Item will be ordered. This determination will be ordered by the

CO and order will be provided to the contractor, in writing, prior to performance of the Optional Award Item and within 24 hours after receipt of the pump test results.

The improvements consist of the following:

1. Well drilling to an estimated depth of 400 feet at appropriate diameters for proper surface sealing and grouting and installation of 10-inch casing.

2. Surface seal to a minimum of 50 feet and grouting at conduit transitions.

3. Well screens at appropriate depths where water bearing formations are encountered.

4. Well Development and well capacity testing. After 2 hours of well development, the well shall be pumped to determine maximum sustainable production capacity.

The improvements and services listed above are all base bid items that are specific to the well construction and testing.

01100 – Summary of Work Page 1 of 4

SECTION 01100

SUMMARY OF WORK

PART 1 - GENERAL

1.01 SUMMARY

A. This section provides background on the proposed work and briefly summarizes the work to be completed under this Contract.

B. The work to be performed under this contract shall consist of furnishing all tools, equipment, materials, supplies, and manufactured articles; all transportation and services, including but not limited to, fuel, power, temporary roadways, and essential communications; all permits, licenses, labor, work, or other operations required for the fulfillment of the contract in accordance with the specifications, drawings, other contract documents, and all applicable regulations and standards, including such detail sketches as may be furnished by the Project Engineer from time to time during construction in explanation of said contract documents.

1.02 SUMMARY OF WORK

A. The Indian Health Service is investigating the potential of providing additional community water supply to the White Swan Community in the Yakama Nation.

Specifically, a 10-inch test well will be constructed in the vicinity of the Well #2 and #3 in order to determine the feasibility of providing community water supply through local groundwater resources. The proposed work generally consists of:

1. Test Well Construction.

i. Construction of one (1) 10-inch test well at the location selected by the Project Engineer (see attached location map) and/or at the location staked in the field by the Project Engineer.

ii. Clearing, grubbing and other measures necessary to facilitate access to the proposed test well location for construction will be completed by the TWSP prior to start of test well construction.

Necessary erosion control measures and general site restoration are the responsibility of the Contractor.

iii. Test pump the test well, including the collection of drawdown and recovery measurements, for a period of twenty-four (24) hours

iv. Complete one (1) chemical analysis as specified in Section 02520

v. Estimated well depth, as indicated on the Proposal Offer Sheet, is

400 ft.

2. Optional Well Construction.

01100 – Summary of Work Page 2 of 4

i. If the test well produces water to the extent that the Government approves the construction of the Option well, the Contractor shall not proceed with construction until written approval (email suffices) has been provided. See Section C-2 SCOPE OF WORK.

ii. Construction of one (1) 10-inch well as shown on the attached location map and at the location staked in the field by the Project Engineer and as required for the test well construction.

1.03 CONTRACT ROLES

This solicitation will result in a contract between the Federal Government of the United States of America and the Construction Contractor to implement improvements to the White Swan water system on behalf of the Yakama Nation on Tribal lands. All construction improvements are owned by the Federal Government during the contract performance period, however, all land continues to be owned by the Yakama Nation.

All primary communication shall take place between the Contractor and the Contracting Officer (CO) as well as the Contracting Officer’s Representative (COR). It will be important to maintain thorough communication with the TWSP operators throughout the project, yet only the Contract Officer has authority to act on behalf of the Government. The contract roles include the following:

A. Federal Government – Referred to as the Government throughout these contract documents. Federal Acquisitions procedures are being used to construct improvements to the White Swan water system. These construction improvements are owned by the Federal Government during the contract performance period until transferred to the Nation.

B. Contract Officer (CO) – The Contract Officer is the person with authority to act on behalf of the Government is anticipated to be.

Jane Stuessy, Contract Specialist Division of Engineering Services Indian Health Service 2201 Sixth Avenue, Rm 937 Seattle, WA 98121

(206) 615-2797 Jane.Stuessy@ihs.gov

C. Contracting Officer’s Representative (COR) – The Contracting Officer's

Representative is the primary point of contact for normal work activities. The COR is responsible for maintaining communication between the Contractor and the Contract Officer as well as with the Project Engineer, the Yakama Nation, and the TWSP operators. The COR evaluates work performance and verifies construction progress and corresponding invoices. The term Inspector may mean Contracting Officer's Representative for every instance in which it mailto:Jane.Stuessy@ihs.gov

01100 – Summary of Work Page 3 of 4 appears in these contract documents or there may be an individual or individuals who may be designated, in writing, as an inspector. The Contracting Officer’s Representative is referred to as the COR within these contract documents and will be designated, in writing. This project’s COR is anticipated to be:

Derek Hancey, Civil Engineer Indian Health Service 1414 NW Northrup St, STE 800 Portland, OR 97209

(503) 414-7784 derek.hancey@ihs.gov

D. Tribal Water and Sewer Program (TWSP) – The TWSP manages and operates the Yakama Nation utility assets and infrastructure. The word TWSP also applies to the Yakama Nation in every instance in which it appears within these contract documents. The TWSP operators and the COR are the primary contacts for emergencies.

Marlene White, Program Manager 41 Wishpoosh Rd Toppensih, WA 98948

(509) 865-5121 x 4602 mwhite@yakama.com

E. Project Engineer – The Design Engineer refers to the Indian Health Service engineer who completed the design and assembled the drawings and specifications for this project. The Project Engineer has some contract administrative tasks such as submittals review and is available for design guidance, but all communications shall be routed first through the Contract officer’s Representative (COR). Within these contract documents the Project Engineer is only referred to as the Project Engineer.

Jason Schneider, Civil Engineer Indian Health Service 341 Fort Rd Toppenish, WA 98948

(509) 865-1775 jason.schneider@ihs.gov

There shall be no contractual relationship either implied or expressed between the Government and a subcontractor at any tier. Government representatives shall be afforded access to the site at all times during the construction period to observe the work and determine if the work conforms to the intent of the design.

Government representatives shall not be responsible for the construction means, mailto:derek.hancey@ihs.gov mailto:mwhite@yakama.com mailto:jason.schneider@ihs.gov

01100 – Summary of Work Page 4 of 4 controls, techniques, sequences, procedures, or construction safety. Inspections conducted by Government representatives shall be for the sole benefit of the Government and the TWSP and shall not relieve the Contractor of any contract requirements.

END OF SECTION

01270 – Price and Payment Page 1 of 4

SECTION 01270

PRICE AND PAYMENT

A. Work covered by this section includes method of measurement and basis of payment for all sections included.

B. All measurements and payments will be based on completed and accepted work performed in accordance with the drawings and specifications.

C. Payment shall be full compensation to complete the work items in good faith, including incidental work.

D. Payment under each line item shall be full compensation for the following:

1. labor

2. materials

3. equipment

4. tools

5. testing

6. subcontracts and services

E. Necessary erosion control and site restoration measures shall be considered incidental to all construction activities and no separate payment will be made for such measures. Clearing, grubbing and other measures necessary to facilitate access to the proposed test well location will be completed by the TWSP prior to the start of test well construction.

1.02 BID ITEMS

A. TEST WELL CONSTRUCTION

1. Mobilization & Demobilization

a. Measurement: By the completion of activities to deliver all materials, equipment and personnel associated with the work to complete the 10-inch test well.

b. Basis for Payment: Payment shall be full compensation for the item of work upon completion of all work activities and site cleanup.

c. Work related to this payment is addressed in Sections:

(1) 02525 –Test Well Drilling

01270 – Price and Payment Page 2 of 4

2. Well Drilling, 14-inch Diameter

a. Measurement: By the vertical foot drilled for the completed well and in accordance with the technical specifications.

b. Basis for Payment: Payment shall be full compensation for well drilling necessary for construction of a 10-inch test well based on the actual number of linear feet drilled, sampling, well log, alignment test, well cap, and all other necessary items required to complete the work as specified. No payment will be made for any quantity deeper than the depth designated by the Project Engineer. Payment will only be made after a well log has been submitted to the Project Engineer. For abandoned wells that are not the fault of the Contractor, compensation shall be paid at the unit bid price.

3. Well Drilling, 10-inch Diameter

a. Measurement: By the vertical foot drilled for the completed well and in

b. Basis for Payment: Payment shall be full compensation for well drilling necessary for construction of a 10-inch test well based on the actual number of linear feet drilled, sampling, well log, alignment test, well cap, and all other necessary items required to complete the work as specified. No payment will be made for any quantity deeper than the depth designated by the Project Engineer. Payment will only be made after a well log has been submitted to the Project Engineer. For abandoned wells that are not the fault of the Contractor, compensation shall be paid at the unit bid price.

4. Steel Well Casing, 10-inch Diameter

a. Measurement: By the vertical foot installed for the completed well and in

b. Basis for Payment: Payment shall be full compensation for casing, drive shoes, and all other necessary items required to complete the work as specified. No payment shall be made for large diameter surface casing used as temporary construction aid, whether withdrawn or not. For abandoned wells that are not the fault of the Contractor, payment for casing shall be based on the following criteria. If the Contractor elects to remove the casing, 01270 – Price and Payment Page 3 of 4 compensation shall be paid at 25 percent of the unit bid price for that size casing. Undamaged casing may be reused in this contract, and when reused, it will be paid for at the unit bid price. If the Contractor elects to leave the casing in place, compensation shall be paid at 75 percent of the unit bid price for that size casing.

5. Stainless Steel Well Screen, 10-inch

a. Measurement: As a lump sum for installation for the completed well and in

b. Basis for Payment: Payment shall be full compensation for formation sampling, all continuous-slot stainless steel screen material and assembly, packer, seals, couplings, bottom fittings, and other appurtenances. Any blank riser or bottom section used is not measured for payment.

6. Sanitary Seal

a. Measurement: By the vertical foot installed for the completed well and in

b. Basis for Payment: Payment shall be full compensation for sanitary grout, placement of sanitary grout, and all other necessary items to complete the work as specified. No payment shall be made for grout required to fill an open hole drilled below the depth to which grouting was directed by the Project Engineer.

c. Work related to this payment is addressed in Section:

7. Well Development

a. Measurement: By the hour for the actual time period spent on developing the well. No payment shall be made for time spent preparing and setting up well development equipment.

01270 – Price and Payment Page 4 of 4

b. Basis for Payment: Payment shall be full compensation for well development at the contract unit price based on the length of time of actual well development.

8. Test Pumping

a. Measurement: By the hour for the actual time period spent test pumping the well. No payment shall be made for time spent preparing and setting up for test pumping equipment.

b. Basis for Payment: Payment shall be full compensation for test pumping at the contract unit price based on the length of time of actual pump testing.

Time spent setting and removing the pump shall not be included in the basis for payment. If for any reason the pump or depth measuring equipment fails prior to completion of the specified test period, no payment will be made for the partial test.

9. Water Analysis

a. Measurement: One time Lump Sum (LS) payment will be issued once two conditions are met.

(1) Receipt by the Owner and Project Engineer of satisfactory bacteriological analysis after initial disinfection. If initial results are unsatisfactory (presence of coliform), the Contractor shall perform one additional disinfection and bacteriological analysis and present results to the Owner.

(2) Receipt of the chemical analysis by Owner.

b. Basis for Payment: Payment shall be full compensation for disinfection, sampling the water strata, performing all tests, submitting the results to the Owner, and all other necessary items required for a complete analysis.

02520 – Test Well Drilling page 1 of 17

SECTION 02520

TEST WELL DRILLING

A. This section includes drilling, casing, screening, developing and testing of test water wells.

B. A complete SOC, VOC, IOC, Secondary Contaminants and Radionuclide test for a Group A water system will be performed for the completed well. Testing cost will be the responsibility of the well driller.

C. The completed test well shall be of single cased construction, complete with well screen, grout, and well cap.

D. The Contractor shall drill, case and screen wells at the size specified in the bid schedule for the test well shown on the attached location plan, or as directed by the Project Engineer.

E. All construction methods and materials for the test well shall meet or exceed state and local requirements.

F. The well drilling Contractor shall comply with state license requirements for well drilling in the state where the work is performed. In addition, the rig operator shall be licensed through the state as a water well operator.

G. The Contractor shall take such precautions as are necessary or as may be required to prevent contaminated water or water having undesirable physical or chemical characteristics from entering the well. The Contractor shall also take precautions during construction to prevent contamination or pollution from the ground surface.

H. Consolidated, unconsolidated and combinations of the two formations may be encountered during this contract. Unless specifically mentioned, there will be no distinction concerning the method of payment for the consolidated and/or unconsolidated drilling. The Owner will not be held accountable for variations of materials encountered during the drilling operations.

1.02 REFERENCES

A. ASTM A53 – Standard Specification for Pipe, Steel, Black and Hot Dipped, Zinc Coated Welded and Seamless.

B. ASTM A276 – Stainless steel well screen

02520 – Test Well Drilling page 2 of 17

C. State of Washington – Department of Ecology, Water Resources, Well

Construction

D. Applicable state codes for the State of Washington

E. WAC Chapter 173-160.

1.03 SUBMITTALS

A. Type of drilling equipment, including method (Mud or Air Rotary)

B. Well drilling rig operator experience and license number

C. Well screen and method of installation

D. Well casing and well cap

E. Method of disinfection

F. Method of development

G. Grout, method of mixing and installation

H. Water testing lab

1.05 CONFLICTS WITH STATE WELL CODES

A. The materials and construction methods specified herein are minimum requirements. Where the appropriate state well codes require more stringent materials or execution methods, they shall apply.

B. Notify the Project Engineer of any planned deviation from these specifications before proceeding so any price changes or quantity adjustments may be negotiated.

1.06 ACCEPTANCE

A. Minimum final yield being sought is approximately 350 gallons per minute. If a stratum, which will produce in excess of the minimum yield, is encountered, the well shall be developed to produce the maximum yield obtainable through the well screen installed.

B. Water shall be clear and free of sand.

C. The drilling shall be accomplished by a rotary drilling machine.

02520 – Test Well Drilling page 3 of 17

D. Work covered by this section will not be accepted until records and testing connected with the work have been completed satisfactorily.

E. The well shall not deviate from the vertical by more than 2-1/2 inches in each 100 feet of depth.

1. A straightness and alignment test shall be run by the contractor on questionable wells after the well is cased. This shall consist of running a pipe 40 feet in length and whose outside diameter is between 2-inch and 1-inch smaller than the inside diameter of the casing to the bottom of the well.

2. If the test pipe binds, does not pass through the well casing freely or is bent as a result of testing procedure, the Project Engineer shall have the authority to reject the well as drilled and cased, with no payment to the contractor, until the deficiency is corrected to the Project Engineer’s satisfaction. No payment will be made to the contractor for the testing procedure or materials.

PART 2 – PRODUCTS AND EQUIPMENT

2.01 DRILLING EQUIPMENT

A. All drilling equipment used under this CONTRACT must be in good working order and capable of accomplishing the work required under this CONTRACT.

B. The OWNER and the ENGINEER reserve the right to inspect all equipment to be used under this CONTRACT and to reject any equipment deemed unsuitable.

2.02 WELL CASING

A. Steel Well Casing

1. The diameter and material of well casing shall be 10-inches.

2. Conform to ASTM A106-91 or A53-93a, Grade A or B, Type E, electric resistance welded or Type S, seamless.

3. Each length of pipe shall be clearly marked in accordance with ASTM A106-91 or A53-93a.

a. Markings shall include manufacturers name, type of pipe, ASTM number and pipe length.

b. Mill certificates shall be supplied if the Project Engineer deems the casing pipe or markings to be of questionable condition.

02520 – Test Well Drilling page 4 of 17

c. Marking shall be rolled, stamped or stenciled by the manufacturer.

Pipe remarked by a pipe supplier, or well driller, will be rejected by the Project Engineer

4. Pipe shall be clean and free of oil, grease, rust, or other detrimental materials. All casing shall be new.

5. Lengths of casing shall be connected with either screwed couplings or approved welds. Welded joints shall be subject to the approval of the Project Engineer.

6. Pipe shall meet the following requirements:

Nominal Outside Nominal Minimum Diameter Diameter Wall Thickness Weight (inches) (inches) (inches) (lbs per lin. foot)

10 10.020 0.365 40.48

2.03 WELL SCREEN

A. General

1. Well screen openings shall be of the proper width to permit the maximum practical sand free yield after development. The openings shall be of geometric shape to permit maximum transmitting capacity without clogging or jamming. A sieve analysis of a representative sample to the water bearing formation may be requested by the Project Engineer to verify proper sizing of the well screen.

2. A well screen shall be installed.

3. The Project Engineer must approve any length and diameter of well screen in excess to the amount indicated on the bid schedule.

B. Stainless Steel Screen

1. Screen shall be designed to produce a minimum loss of head between the water bearing stratum and the well.

2. A telescopic screen and K-packer may be used in instances where caving of the bore is a concern. The project engineer must approve the use of a telescopic screen and associated methods for installation.

3. Designed for entrance velocity less than 0.1 feet per second

4. Continuous slot design, with outer windings and internal longitudinal bars.

02520 – Test Well Drilling page 5 of 17

5. Both members shall be type 304 stainless steel conforming to ASTM A276-92.

6. The maximum recommended tensile pull on the screen is 1600 pounds.

7. Screen shall be a commercial product, equal to screens manufactured by US Filter, Johnson Screens, New Brighton, MN or Howard Smith of Houston, TX.

2.04 GROUT

A. Proportion of Portland Cement and the least quantity of water (not over 6 gallons per cubic foot of cement) required giving a mixture of such consistency that it can be forced through the grout pipe.

1. Two percent (by weight) of bentonite clay may be added to the mixture to improve flow properties.

B. Bentonite grout, in lieu of cement, is acceptable if specified in the bid schedule.

2.05 DRILLING FLUID (MUD ROTARY METHOD)

A. Conform to standard accepted well drilling practice for water wells.

B. All drilling water shall be disinfected with chlorine, which shall be added to the water tank before each refilling in a quantity such that a concentration of 50- 100 ppm of chlorine is obtained in all of the water.

2.06 WELL CAP

A. The well casing pipe shall be sealed or covered with an approved non-corrodible, watertight, vented, weather and vermin-proof compression type well cap. All nuts and bolts shall be made of non-corrodible material.

B. The well cap shall be equipped with a screened downward facing well vent not less than 1/4-inch in diameter. The vent shall be equipped with a vermin proof vent screen made of non-corrodible material.

C. Similar to Monitor 6WPSM.

PART 3 - EXECUTION

3.01 DRILLING

A. General

02520 – Test Well Drilling page 6 of 17

1. State license requirements shall be met.

2. Locate all existing underground utilities.

3. Construct well as indicated on the plans or as staked by the Project

Engineer.

4. Prevent contaminated water from entering the well.

5. Utilize an approved drilling method.

6. Minimum final yield of 350 gallons per minute is being sought, however, well should always be developed to its maximum yield.

7. Drill wells no deeper than the depth specified in the bid schedule, unless approved by the Project Engineer.

8. If satisfactory yield is obtained at a lesser depth, terminate drilling and develop at that depth.

B. Rotary Method (Mud or Air)

1. Equipment must be in good condition, capable of drilling to 400 feet.

2. Capable of providing single cased construction, with well screen and grout.

3. Drill hole shall be sufficiently sized to provide unimpeded casing installation and grouting.

4. Drilling fluid and bit size (with approval of the ENGINEER) shall be sufficient to complete the bore hole to accept the casings and minimum grout thickness specified for the surface seal, pump chamber, and aquifer penetration sections.

5. Drilling water (mud rotary) shall be disinfected with a chlorine concentration of 50-100 ppm in the water tank.

6. If conventional mud rotary drilling is used in rock formations, the

ENGINEER may require the periodic stopping of drilling, removal of mud from the hole and testing for yield with compressed air, or an approved alternate method.

7. The drilling fluid used in conventional mud rotary drilling shall conform to standard accepted well drilling practice for water wells as approved by the

02520 – Test Well Drilling page 7 of 17

ENGINEER. Mixing of any additives shall be performed with a standard jet type mixer or as approved by the ENGINEER. All drilling water shall be disinfected with chlorine, which shall be added to the water tank before each refilling in a quantity such that a concentration of 50-100 ppm of chlorine is obtained in all of the water.

8. If conventional air rotary drilling is used, unconsolidated or semi-consolidated formations may cave if not supported during the drilling with casing or drilling fluid. The CONTRACTOR shall use drilling equipment and methods which will minimize caving, where necessary.

3.02 CASING

A. Install the sizes stated on the bid schedule.

B. Install casing in wells to a depth appropriate for the formation type and minimum yield specified.

C. Connect casing lengths with either screwed couplings or approved welds.

1. Keep surfaces to be welded free from local scale, rust, grease, paint and other foreign materials.

2. The technique of welding employed, the appearance and quality of the welds made, and the methods of correcting defective work shall conform to normally accepted standards of workmanship.

3. Ends to be welded shall be factory cut and beveled.

4. All field cut ends must be approved by the Project Engineer.

5. Welding will not be allowed when the base metal temperature is below 0 degrees Fahrenheit.

6. Heat areas within 3 inches of the weld when the base metal temperature is between 0 and 32 degrees Fahrenheit.

7. Casing sections having twists, bends, offsets, and openings will not be accepted.

8. Make all joints watertight.

D. If the top of the casing is torch cut, grind all rough surfaces smooth.

E. Plumbness and Alignment

1. Maximum deviation from vertical in any 100 feet of depth is 2 1/2 inches.

02520 – Test Well Drilling page 8 of 17

2. Conduct a straightness and alignment test on all questionable wells after casing.

a. The test will consist of running a piece of pipe 40 feet long whose diameter is 2 inch to 1 inch smaller than the inside diameter of the inside of the casing to the bottom of the well.

b. No payment will be made for testing procedure or materials.

c. If the test pipe binds, is bent as a result of testing procedure, or does not pass through the well casing freely the well will not be accepted and no payment will be made.

3.03 SAMPLING OF FORMATION

A. Sampling is considered an essential part of this contract.

B. Samples of the formation shall be taken as described in the following paragraphs.

1. Samples shall not be washed and shall be kept in cloth bags.

2. Samples shall be properly marked with well number, location, date and depth.

3. These samples shall be furnished to the Project Engineer as drilling progresses.

4. Rotary Drilling: The contractor shall keep an accurate record of the location of the top and bottom of each stratum penetrated, and the elevation to which the water level stabilizes, as each water bearing stratum is encountered. The contractor shall place and save in cloth bags samples taken from each 10 feet of drilling, and at every change in formation. If so directed by the Project Engineer, the driller may be required to take samples at 1-foot intervals in a potential aquifer.

3.04 SCREEN INSTALLATION

A. Select appropriate slot size for well screen based on formations encountered during test well construction.

B. A well screen shall be installed. If the estimated quantity of screen is found to be insufficient, payment shall be negotiated between the contractor and the

CO.

02520 – Test Well Drilling page 9 of 17

C. Install well screens in unconsolidated formations, after sufficient yield is obtained from the water bearing formation in accordance with state and local codes at the depths and lengths approved by the Project Engineer.

D. Fill the drill hole with approved material, such as bentonite with fine sand seal, if the bottom of the drilled well is deeper than the screened area. Sand seal shall be a minimum of 3 feet thick.

E. The well screen openings shall be of the proper width to permit the maximum practical sand free yield after development. The openings shall be of a geometric shape to permit maximum transmitting capacity without clogging or jamming.

F. A sieve analysis of a representative sample of the water bearing formation is required to verify proper sizing.

G. Acceptable methods for installing stainless steel well screens:

1. Pull back method

a. Provided the formations in the hole are not subject to collapse and bind around the pipe. A different method shall be used subject to the approval of the Project Engineer if the formation has a tendency to collapse.

b. Provide a 1 1/2-foot section of riser pipe and neoprene type packer

2. Open hole method.

3. Bail down method.

4. Wash down method.

5. Welding the screen to the casing.

H. If it is necessary to join several screens together, the joints connecting the screen sections shall be butt-type couplings of the same materials as the screens.

I. If the screen is not welded securely to the casing, the screen shall be provided with a 1 1/2-foot section of riser pipe and a neoprene type packer, which shall be securely installed in the casing

J. The Project Engineer must approve all other methods.

K. Fill the drill hole with approved material if the bottom is deeper than the screened area.

02520 – Test Well Drilling page 10 of 17

L. Water samples may be required prior to development and test pumping for the purpose of a preliminary chemical analysis.

1. Pump or bail well until a suitably clear sample can be obtained.

3.05 WELL DEVELOPMENT

A. The contractor shall develop the well by such methods as will effectively extract from the water bearing formation the maximum practical quantity of drilling mud, fine sand, silt or other fine materials. Development shall bring the well to a maximum yield per foot of draw-down, and the water shall be sand free at the maximum pumping rate.

B. Develop the well using a method that extracts the maximum practical quantity of drilling material, fine sand, silt or other fine material.

1. Maximum allowable sands and fine material: 2 ppm (by weight).

C. The Project Engineer shall approve the development method used by the contractor prior to initiation of the work.

D. Development shall not be considered as test pumping. Checking an aquifer for yield shall not be considered to be development time.

E. Acceptable development methods include surge plungers, compressed air or high velocity jetting.

1. Bailing or pumping is not acceptable.

2. Compressed air must be delivered at a minimum rate of 75 cfm at a minimum pressure of 100 psi.

F. Conduct development so as to prevent settlement of the stratum above the water bearing formation.

G. High velocity jetting with phosphates may be required.

1. Follow established procedures for this type of development.

2. If this item is not included in the bid schedule and the Project Engineer requires the contractor to utilize this method of development a unit price for the work shall be negotiated between the contracting officer and the contractor.

3.06 GROUTING

02520 – Test Well Drilling page 11 of 17

A. Method of grout placement must specify forcing grout under pressure from the bottom of the annular space toward the surface.

B. Grouting shall be completed continuously and in a manner that will insure the filling of the entire annular space with grout in a single operation.

C. The mixture, method of mixing, and consistency shall be approved by the Project Engineer before grouting of the wells.

D. Minimum thickness of grout seal of 1 1/2 inches shall be maintained between well casing and the drill hole for the entire length of casing to be grouted.

E. Fill annular space between casing and drill hole with cement grout from the top of the production zone to a depth of 18 feet below surface.

1. State well codes may require additional grout depth.

2. At the direction of the Project Engineer the depth of grouting may be increased where necessary to provide increased protection of the water supply.

3. In the case of a well in a sandstone formation the annular space between the casing and drill hole shall be filled with cement grout in accordance with applicable State requirements.

4. Where a bore hole larger than the outside diameter of the casing has been drilled below the depth to which the casing is to be grouted, the lower part of the hole shall also be backfilled with cement grout, or other material approved by the Project Engineer. No payment shall be made for the cement grout or backfill used for this purpose.

F. Grout shall be placed in the entire annual spacing of the well in one continuous placement.

G. Use temporary casing where necessary to ensure minimum thickness of grout.

This casing shall be withdrawn as the grout is placed. Temporary casing will not be left in place.

H. No work on the well will be allowed within 72 hours after completion of grouting.

1. If quickset grout is used this period may be reduced to 24 hours if approved by the Project Engineer.

3.07 TESTING FOR YIELD AND DRAWDOWN

A. Contact Project Engineer two working days prior to the start of test pumping.

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B. Provide all necessary labor, equipment, materials and power required for test pumping.

1. Supply measuring equipment to determine water levels and the rate of pump discharge to the nearest 0.1-foot and 1 gpm.

2. Equipment considered suitable are electrical probes, or airline for well level measurements; and an orifice meter, weir or a calibrated water meter for flow measurement.

3. Provide all piping necessary to convey water away from test pump site.

C. Test pump well at 350 gpm unless otherwise directed.

D. Utilize a pump that can be removed from the well after the completion of the test pumping operation.

E. Duration of drawdown test: twenty two hours, unless otherwise directed by the Project Engineer.

1. Take drawdown and pump discharge measurements every 1 minute for the first ten minutes.

2. Take drawdown and pump discharge measurements every 5 minutes for the next ninety minutes.

3. Take drawdown and pump discharge measurements every 30 minutes for the remainder of the test.

F. Record recovery measurements immediately upon completion of test pump for one hour total, unless otherwise directed by the Project Engineer.

1. Take recovery readings every minute for the first 10 minutes.

2. Take recovery readings every 10 minutes for the next ninety minutes.

3. Take recovery readings every 30 minutes until well has recovered to within 5 feet of the original static water level.

4. The Project Engineer may require fewer recovery measurements.

G. If requested by the Project Engineer, take water samples for field chemical analysis test after test pumping but before grouting.

H. Remove all temporary-pumping facilities at the conclusion of test pumping.

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I. Submit test pump results to the Project Engineer within 5 days of completion.

J. Checking an aquifer for yield shall not be considered to be development time.

3.08 DISINFECTION

A. Upon completion of test pumping and construction, thoroughly clean the well of all foreign material (i.e. cement, oil, grease, joint dope, scum, etc.)

B. Disinfect well with a chlorine solution, chlorine bleach, sodium hypochlorite or calcium hypochlorite solution. Chlorine compounds having additives may not be used.

1. Prepare solution prior to injection into well.

2. Mix volume and strength such that a minimum concentration of 100 ppm of free residual chlorine is obtained in all parts of the well for a minimum of 8 hours after injection.

3. Flush casing above static water level with solution.

4. After completion of disinfection procedures the well shall be thoroughly flushed and a bacteriological water sample shall be taken and submitted to verify that disinfection procedures were successful.

3.09 CHEMICAL AND BACTERIOLOGICAL ANALYSIS

A. Take bacteriological samples immediately after disinfection and flushing of the test well.

B. Submit bacteriological samples to a WA State Department of Health approved lab.

1. Provide copy of results within 10 days of receipt of the report.

2. If a sample tests positive, notify Project Engineer immediately and repeat chlorination of the well until a sample tests negative.

C. The contractor shall furnish to the Project Engineer a chemical analysis of the water for each drilled or renovated well. Copies of the results must be provided within 10 days of receipt.

D. The contractor shall be responsible for furnishing the required size, preservative and number of containers, collecting the water sample, arranging for the chemical analysis to be performed at a laboratory that is state or EPA certified and furnishing the results to the Project Engineer. In addition, the lab

02520 – Test Well Drilling page 14 of 17 must be certified in each of the specified EPA methods for the chemicals being tested.

E. The following is a list of most of the parameters to be analyzed, however, the entire list of parameters to be measured must meet the current National Primary Drinking Water Standards list determined by the U.S. E.P.A. and the minimum detection level (MDL) for each parameter shall be less than the maximum contaminant level (MCL):

Inorganic Chemicals

1. Antimony

2. Arsenic

3. Asbestos

4. Barium

5. Beryllium (total)

6. Cadmium

7. Chromium (total)

8. Copper

9. Cyanide (as free cyanide)

10. Fluoride

11. Mercury (inorganic)\

12. Nitrate (measured as Nitrogen)

13. Nitrite (measured as Nitrogen)

14. Selenium

15. Thallium Organic Chemicals

1. Acrylamide

2. Alachlor

3. Atrazine

4. Benzene

5. Benzo(a)pyrene (PAHs)

6. Carbofuran

7. Carbon tetrachloride

8. Chlorodane

9. Chlorobenzene

10. 2,4-D

11. Dalapon

12. 1,2-Dibromo-3-chloropropane (DBCP)

13. o-Dichlorobenzene

14. p-Dichlorobenzene

15. 1,2-Dichloroethane

16. 1,1- Dichloroethylene

17. cis-1,2-Dichloroethylene

18. trans-1,2-Dichloroethylene

19. Dichloromethane

02520 – Test Well Drilling page 15 of 17

20. 1,2-Dichloropropane

21. Di(2-ethylhexyl) adipate

22. Di(2-ehtylhexyl) phthalate

23. Dinoseb

24. Dioxin (2,3,7,8-TCDD)

25. Diquat

26. Endothall

27. Endrin

28. Epicholorohydrin

29. Ethylbenzene

30. Ethylene dibromide

31. Glyphosate

32. Heptachlor

33. Heptachlor epoxide

34. Hexachlorobenzene

35. Hexachlorocyclopentadiene

36. Lindane

37. Methoxychlor

38. Oxamyl (Vydate)

39. Pentachlorophenol

40. Picloram

41. Polychlorinated biphenyls (PCBs)

42. Simazine

43. Styrene

44. Tetrachloroethylene

45. Toluene

46. Toxaphene

47. 2,4,5-TP (Silvex)

48. 1,2,4-Trichlorobenzene

49. 1,1,1-Trichloroethane

50. 1,1,2-Trichloroethane

51. Trichloroethylene

52. Vinyl Chloride

53. Xylenes (total)

Radionuclides

1. Alpha/photon emitters

2. Beta photon emitters

3. Gross alpha, including Uranium

4. Radium 226 and Radium 228 (combined)

5. Uranium

Microorganisms

1. E. Coli

02520 – Test Well Drilling page 16 of 17

2. Fecal coliform

3. Total Coliforms 4.

Secondary Contaminants

1. Alkalinity

2. Aluminum

3. Chloride

4. Color

5. Corrosivity

6. Fluoride

7. Iron

8. Manganese

9. pH

10. Silver

11. Sulfate

12. Total Dissolved Solids

13. Zinc

Other Analysis

1. Total Organic Carbon (TOC)

F. Submit chemical analysis results to Project Engineer within 30 days of completion of test pumping.

3.10 CAPPING

A. Install approved well cap in accordance with manufacturer’s recommendations to be water tight and secured to casing to prevent unauthorized removal.

3.11 WELL LOG AND RECORDS

A. The contractor shall keep a log of each hole drilled under these specifications recording:

1. Well number, location and site number.

2. Location of the well by 1/4 section, range and township.

3. Depth, thickness, type, general characteristics and drilling characteristics of each material encountered.

4. Size, type, and length of the well casing installed.

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5. Well screen size, material, length, manufacturer, connections and fittings.

6. Test pumping data.

7. Pump equipment, pitless adapter, and drop pipe.

8. Method and date of bacteriological sampling.

B. Each log shall be kept carefully and accurately with entries made in sequence so that each can be correlated with the depth of hole at the time. It shall be brought up to date at the end of each working day and shall be furnished to the Project Engineer within one week after the performance of all work on the well, whether completed or abandoned.

C. The driller shall also file an official construction report with the state agency designated to handle them in the particular state in which the well is located and provide the Project Engineer with a copy of the log and evidence of submittal within thirty days after well is completed.

The contractor shall upon the completion, disinfection and flushing of each well collect and submit a bacteriological sample to the state health department laboratory for analysis. The contractor shall provide the Project Engineer with a copy of the laboratory analysis report within ten days of the contractor’s receipt of the report except when the sample is unsafe in which case the Project Engineer shall be notified immediately. If a positive sample is analyzed the contractor will be required to chlorinate the well until a negative sample is obtained and analyzed.

3.12 UNACCEPTED DRILLED WELLS

A. Drilled wells will not be accepted due to unsatisfactory bacteriological quality, poor alignment, or loss of tools.

B. Obtain Project Engineer’s approval prior to abandoning wells.

C. Well abandonment shall be in accordance with WA State Regulations