A06_Specifications_-_Mason_Pass_and_Weed_Heights_Wells.pdf

Technical Specifications for

Mason Pass and Weed Heights Wells

BUREAU OF LAND MANAGEMENT

5665 Morgan Mill Road

Carson City, NV 89701

MAY 2023

MASON PASS AND WEED HEIGHTS WELLS

PROJECT SPECIFICATIONS

TABLE OF CONTENTS

Specification Page No

GENERAL REQUIREMENTS

01009 General Information and Requirements ...................................................01009(1-4)

01505 Mobilization .............................................................................................01505(1-2)

SITE WORK

02670 Water Wells ..............................................................................................02670 (1-3)

02671 Well Drilling and Casing .........................................................................02671 (1-7)

02672 Well Testing .............................................................................................02672 (1-3)

Specifications Summary Sheet ............................................................................. .SSS (1-2)

GENERAL INFORMATION AND REQUIREMENTS

01009-1

SPECIFICATION 01009

PART 1: GENERAL

1.1 SUMMARY:

A. Description of Work: Furnishing labor, equipment, supplies, and materials to construct and test two wells for livestock watering. Each developed well shall have an earthen platform and be sealed with a well seal per contract specifications and attached detail.

B. Location: Work under this Contract is in Lyon County, Nevada. The work locations and access are shown on the Drawings.

C. Specifications Summary Sheet: Designates the type and quantity of work required at the project location, dimensions required, and other specifications.

1.2 REFERENCES:

A. Referenced Specifications/Standards with Abbreviations and/or Acronyms: Wherever the following acronyms are used in these specifications or on the drawings, they are to be construed the same as the respective expressions represented. Copies of the referenced specifications/standards referred to herein may be procured by the Contractor, from the following:

ASTM American Society for Testing and Materials

P.O. Box C700

West Conshohocken, PA 19428-2959

NSF National Sanitation Foundation

P.O. Box 130140

Ann Arbor, MI 48105

DCNR Nevada Department of Conservation and Natural Resources

Regulations for Water Well and Related Drilling http://water.nv.gov/home/pdfs/wd%20regs.pdf

NAC Nevada Administrative Code

Chapter 534 – Underground Water and Wells https://www.leg.state.nv.us/NAC/nac-534.html

1.3 SUBMITTALS:

A. Scope: Submittals include product data, schedules, manufacturer's literature, yield test results, and well log reports.

http://water.nv.gov/home/pdfs/wd%20regs.pdf https://www.leg.state.nv.us/NAC/nac-534.html

01009-2

B. Requirements: Refer to specifications for submittals required. Allow at least 3 working days for review. Submittals shall be delivered to Contracting Officer (CO).

C. Certificates of Conformance: The Contracting Officer may permit use, prior to sampling and testing, of materials when accompanied by Certificates of Conformance. Materials used based on a Certificate of Conformance may be sampled and tested. Installation of materials based on Certificates of Conformance shall not relieve the Contractor of responsibility for incorporating materials which conform to the requirements of the drawings and specifications. Material not conforming to those requirements will be subject to rejection, whether in place or not.

D. Format: The form of the Certificate of Conformance provided by the supplier shall be as follows:

1. The certificate shall state that the named product conforms to the Contract requirements.

2. The certificate shall either be accompanied with a certified copy of the test results, or certify that such test results are on file with the manufacturer and will be furnished to the Contracting Officer upon request.

3. The certificate shall provide the name and address of the manufacturer, the testing agency, and the date of tests.

4. The certificate shall set forth the means of identification which will permit field determination of the product delivered as being the product covered by the certification.

E. Identification of Submittals: Completely identify each submittal by showing at least the following information:

1. Name and address of submitter, plus name and telephone number of the individual to contact for further information.

2. Name of project as it appears in these specifications.

1.4 QUALITY ASSURANCE:

A. Codes and Standards: The work shall comply with codes and standards applicable to each type of work and as listed in the individual sections of these specifications. This Contract incorporates materials, applications, and tests by reference, with the same force and effect as when they were given in full text.

B. Conflict: Where a conflict occurs between reference documents and project specifications, the project specifications shall govern.

01009-3

1.5 DELIVERY, STORAGE, AND HANDLING:

A. Delivery: The Contractor shall protect products, incorporated into the work, from damage while in transit to the site. Products must be delivered in original unopened containers with manufacturer's name and brand designation and contents legibly indicated.

B. Storage: The Contractor shall provide temporary storage for products which will protect them from theft or damage until installation on the project and final acceptance. The storage area shall permit access for inspection and handling.

C. Handling: The Contractor shall load and unload products in such a manner that protects them from damage until installation on the project.

1.6 PROJECT/SITE CONDITIONS:

A. Access to work shall be provided by and at the Contractor's expense.

1. Public or private access roads damaged by the Contractor shall be restored at the

Contractor's expense and to the same condition as they were at the commencement of work.

2. Access to the work shall be by existing roads and trails. Exceptions must be provided in writing by the Contracting Officer.

3. Access construction site shall be done only with written approval from the

Contracting Officer.

4. Survey monuments or markers disturbed or removed during construction shall be reset at the Contractors expense.

B. Environmental Considerations: Operations of the Contractor upon government premises including storage of materials, camping areas, and equipment parking shall be confined to areas approved. In the event the surrounding landscape is disturbed, the Contractor shall restore that area at the Contractor's expense.

PART 2: PRODUCTS

(There are no applicable requirements.)

PART 3: EXECUTION

3.1 PROJECT MEETINGS:

A. Prework Conference:

1. A prework conference will be held prior to the start of work. The Contractor will be

01009-4 notified in advance of meeting time, date, and place. The purpose will be to review required work, project drawings, specifications, construction schedules, payroll, payments, and administrative provisions of the Contract.

2. Work Schedule: The schedule shall be submitted at the pre-work conference. When requested, the Contractor shall submit an updated schedule within 3 calendar days.

3. The Contractor, subcontractors, and the persons responsible for coordination of the work shall be present at the meeting.

4. The Contractor shall be prepared to summarize and explain procedures planned for the project and present the submittals as requested in the specifications.

3.2 PROTECTION OF EXISTING PROPERTIES

A. General

1. Take precautions to protect all adjoining private and public property and facilities, including underground and overhead utilities, structures, and fences. Restore or replace all disturbed or damaged facilities to its original condition at Contractor’s expense to include all fees associated with the locates, taking necessary steps and precautions to protect buried utilities.

2. Contact utility owners using the Nevada 811 system for utility locates before starting work. The Contractor is also responsible for ensuring that all private utilities are located within the work area. Protect the utilities exposed during the work and prevent damaging underground utilities adjacent to excavations. Immediately notify the utility owner of any construction damage. Repairs of damage to utilities are at the expense of the Contractor.

3.3 WORK LAYOUT:

A. The Government will set a location marker at each site.

3.4 SALVAGEABLE ITEMS:

A. Salvageable items shall become the property of the Government. Remove and store items at locations and as directed by the Contracting Officer (CO). The Contractor shall replace or reimburse the Government for items lost or destroyed during removal.

B. Requirements: (There are no applicable requirements.)

PART 4: MEASUREMENT AND PAYMENT

4.1 METHOD OF MEASUREMENT:

A. Units: The work described in this section will not be measured for payment.

01009-5

4.2 BASIS OF PAYMENT:

A. Payment: No direct payment for the work described under this section will be made. The

Contractor shall include consideration for this item in the quote value price for other scheduled items of the Contract.

END OF SPECIFICATION

MOBILIZATION

01505-1 MCFO 10 WELLS

SPECIFICATION 01505

A. Section Includes: Preparatory work and operations, including those necessary to the movement of personnel, equipment, supplies and incidentals to the project site; and for other work and operations which must be performed, or costs incurred prior to beginning work on the various items on the project site. This specification does not include moves between project sites.

(There are no applicable requirements.)

A. Units: Progress payments will be made as follows:

1. When 5 percent of the original contract amount is earned from other bid items, 50 percent of the amount bid for mobilization or 5 percent of the original contract amount, whichever is lesser, will be paid.

2. When 10 percent of the original contract amount is earned from other bid items, 100 percent of the amount bid for mobilization or 10 percent of the original contract amount, whichever is lesser, will be paid.

3. Upon completion of work for the project, payment of the amount bid for mobilization in excess of 10 percent of the original contract amount, will be paid.

4. The total sum of all payments shall not exceed the original contract amount bid for mobilization, regardless of if the contractor may have shut down the work on the project or moved equipment away from the project and then back again.

A. Payment: No direct payment for moves between project sites will be made. The Contractor shall include consideration for moves between project sites in the Schedule of Items (SOI)

01505-2 MCFO 10 WELLS

for other items of the Contract. Prices and payment will be full compensation for the work described in this section. No modification and adjustments shall be allowed for costs and changes to mobilization despite changes in fuel or transportation costs. Payment will be made under:

Pay Item Pay Unit

01505(1) Mobilization...................................................................................................... Lump Sum

WATER WELLS

02670-3 MCFO 10 WELLS

SPECIFICATION 02670

A. Specification Includes: Record keeping, capping of well, disinfection of well, water quality testing, and well abandonment.

1.2 SUBMITTALS:

A. Records: Final well logs and reports described in this specification shall be furnished to the

Contracting Officer (CO) in the format agreed upon at the Pre-Work Conference upon completion of the well.

3.1 WELL LOG AND SAMPLES:

A. Well Log: The Contractor shall keep a complete well log as required by State law (NAC

534.170, 534.340), and shall check formations and enter the results in the log for intervals not to exceed 10 ft. The log of the well shall show material penetrated and full descriptive notes made of each stratum found by the drill and difficult or unusual conditions met in drilling. Water-bearing strata shall be described in detail as to loose or compact material, color, and if gravel, whether it is water-worn or angular. The presence of clay shall be noted. The log must be kept up to date with the progress of the well drilling and shall be available for inspection. Furnish one copy of the complete log to the Project Inspector (PI) after completion of drilling.

B. Information for State Filing: Furnish the Contracting Officer (CO) with drilling information required by State law for filing on water wells and prepare and submit reports required of the driller by State law (NAC 534.345).

3.2 DISINFECTION:

A. Stock Water Wells: Disinfect by mixing the appropriate amount of disinfectant (from table below) and pouring into PVC casing prior to capping well.

02670-4 MCFO 10 WELLS

B. Chlorine Solution: Prepare and apply chlorine solutions according to the following table:

Chlorine Compound Required to Dose 100 Feet of Water-Filled Well at 100 ppm

Casing Diameter

(Inches)

Area of Casing

(Sq. In.)

Volume Per 100

Feet (Gallons)

5.25% Purex

Clorox (liquid measure)

Calcium

Hypochlorite

(dry measure) 4 12.56 65.3 1 pint 0.08 pounds

5 19.63 102.0 1.5 pints 0.132 pounds

6 28.27 146.9 1 quart 0.19 pounds

C. Disinfection of Test Pump and Equipment: When the test pump or other equipment is installed after the well has been disinfected, wash and disinfect the parts of the test pump or equipment that will be placed in the well.

3.3 ABANDONMENT OF THE WELL:

A. Abandonment Due to the Contractor's Actions: When the drilled well must be abandoned because of the actions of the Contractor, including but not limited to lost tools, damaged well, misalignment, or other causes attributed to careless or poor workmanship, pull casing

(if installed) that can be removed. Fill the hole with grout or other impervious earth material according to State regulations and requirements. The Contractor shall then drill a new well within 20 ft. of the original well.

B. Abandonment Due to Other Causes: When the well must be abandoned because of inadequate quantity or quality of the water, or for another reason not the fault of the

Contractor, pull the casing (if installed) that can be removed. If casing cannot be pulled, cut casing off 3 ft. below grade and fill the hole with sealable material according to State regulations and requirements.

3.4 SANITARY PROTECTION OF WELL:

A. General: The Contractor shall protect the well during the construction period to prevent tampering or seepage of contaminated water, petroleum products, or other contaminants into the well from the ground surface.

B. Seal: When the well is completed, install a well seal. Plug all holes in well seal.

C. Grading: Slope the ground immediately surrounding the top of the well casing away from the well in all directions at a minimum 10% grade. See Water Well Detail Drawing.

02670-5 MCFO 10 WELLS

D. Correcting Contamination: If the well becomes contaminated, or water with undesirable physical or chemical characteristics enters the well due to the neglect of the Contractor, corrective work, including the supplying of casing, seals, sterilizing agents, or other materials necessary to prevent contamination of the aquifers, shall be performed at the

Contractor's expense.

A. General:

1. Rig or Standby time will not be paid for.

2. No payment will be made for drilling, installing casing, removing casing, or the plugging of a well abandoned due to Contractor's actions.

3. No payment will be made for record keeping, disinfection of the well, or furnishing and installing the cap or compression seal. The Contractor shall include consideration for these items in the bid price for other items of the Contract.

B. Units:

1. Payment will be made for furnishing and installing materials for the quantity abandoned due to causes not the fault of the contractor. Pulling casing and plugging the hole when the well is abandoned due to causes not the fault of the

Contractor will be based on the price negotiated by the Contracting Officer.

A. Payment: No direct payment for the work described under this section will be made. The

Contractor shall include consideration for this item in the bid price for other items of the

Contract.

WELL DRILLING AND CASING

02672-1 Mason Pass and Weed Heights Wells

SPECIFICATION 02671

A. Specification Includes: Drilling water wells and installing Contractor furnished property in water wells.

1.2 REFERENCES:

A. American Society for Testing and Materials (ASTM):

ASTM D2564 Standard Specification for Solvent Cements for Poly Vinyl Chloride

(PVC) Plastic Piping Systems.

ASTM D2855 Standard Practice for Two-Step (Primer and Solvent Cement) Method of

Joining Poly Vinyl Chloride (PVC) or Chlorinated Poly Vinyl Chloride

(CPVC) Pipe and Piping Components with Tapered Sockets.

ASTM F656 Primers for use in Solvent Cement Joints of Poly Vinyl Chloride (PVC)

Plastic Pipe and Fittings.

ASTM F480 Thermoplastic Well Casing Pipe and Couplings Made in Standard

Dimension Ratios (SDR), SCH 40 and SCH 80.

B. National Sanitation Foundation (NSF).

1.3 SUBMITTALS:

A. Drilling Schedule: The Contractor shall submit a complete and practicable drilling program at the pre-work conference. The program shall provide for orderly performance of the work and be in such form and detail as to show the following for each well:

1. Sequence of drilling operations.

2. The days of the week and month that work is to be performed, in agreement with the

Government.

3. The number and length of each shift per day. The length of a shift may be extended in the field as required to avoid interrupting a drilling and testing operation.

02672-2 Mason Pass and Weed Heights Wells

1.4 PROJECT CONDITIONS:

A. Well Depth and Material Quantities: Well depth and material quantities listed in the

Specifications Summary Sheet (SSS) and Schedule of Items (SOI) are estimates. The final determination of depth and material quantities will be made in the field and will depend on actual geological conditions encountered during the drilling operation. The Contracting

Officer (CO) shall have the option of ordering abandonment of a well at any point during the drilling operation. Well abandonment shall be in accordance with Specification 02670

- Water Wells.

A. Rig and Standby Time: No rig or standby time will be paid for in this Contract.

2.1 CONTRACTOR FURNISHED MATERIALS:

A. PVC Solvents: Certified by manufacturer for use on Type I PVC pipe under conditions existing at worksite at time of application. Certified by NSF for potable water systems.

Primer and cement conform to ASTM F656 and D2564 respectively.

B. Medium Chip Bentonite: For surface casing and annulus of well casing. High swelling, medium chipped 1/4 inch to 1/2 inch, chemically unaltered. WYO-BEN Enviro Plug

Medium for comparison.

C. Bentonite Grout: Meeting NAC 534.042 standards including not more than 87.9 percent water and not less than 12.1 percent sodium bentonite by weight, has a hydraulic conductivity of less than 10-7 centimeters per second, and a fluid weight of not less than nine pounds per gallon.

D. Cement Grout: Meeting NAC 534.060 standards including at least seven bags of cement per cubic yard and not more than seven gallons of clean water for each 94 pound bag.

E. Drilling Fluid Additives: If additives are required the Contractor shall submit manufacturer's literature describing the properties of the additive, mix proportions, application methods, and reason for use, prior to use to the Contracting Officer (CO) for approval.

F. Gravel Pack: Estimated grain size shown on Specifications Summary Sheet, 95% silica, roundness and sphericity of 0.6 to 0.8, washed and screened by US standard sieve sizes.

G. PVC Solid Casing: 5-inch internal diameter (ID) schedule 40 belled end, solvent weld casing conforming to ASTM F48.

H. PVC Slotted Casing: 5-inch ID schedule 40 belled end, solvent weld, manufactured slots at

02672-3 Mason Pass and Weed Heights Wells dimensions in Specifications Summary Sheet.

I. PVC Caps and Couplings: Schedule 40 for 5-inch solid and slotted casing.

J. Well Seal: Fits inside 8-inch steel surface casing, painted, split cast iron with 1-1/4 inch hole for drop pipe and with styrene butadiene rubber gasket.

K. Steel Surface Casing: Eight (8) inch, 0.250 wall thickness, 25 feet in length.

L. Casing Centralizers: Shall be steel sized to fit the casing and the hole.

2.2 EQUIPMENT:

A. Drilling Equipment: Except as otherwise specified herein, type of drilling equipment shall be determined by driller.

B. Drill Bits: The pilot hole shall be drilled using a drag bit. However, a roller bit will be permitted for drilling through hard, well cemented formations. A roller bit shall be used to ream the pilot hole to full size. Either a drag or roller bit may be used to drill the hole for the surface casing.

C. Minimum Equipment: The Contractor shall furnish equipment of sufficient size and in sufficient quantities to drill to the maximum depth listed in the Specifications Summary

Sheet.

3.1 INSTALLATION:

A. Order of Drilling: The drilling of the well hole shall be done in two steps. A pilot hole will be drilled and then reamed. Contracting Officer (CO) must witness drilling of pilot hole.

Drilling shall continue until water of adequate quality and quantity has been encountered or that unfavorable conditions require well abandonment. If drilling results are favorable for completing well, Contractor shall then ream the pilot hole to full size to the required depth.

B. Work Time Limits: Drilling of pilot hole shall be accomplished within a continuous 48-hour period. Reaming, casing installation, and gravel pack placement shall begin within 24 hours of completion of pilot hole drilling.

02672-4 Mason Pass and Weed Heights Wells

Failure to comply with these time limits shall be sufficient cause to abandon hole due to

Contractor's actions in accordance with Specification 02670 - Water Wells.

C. Drilling Location: Drill the well at the location staked.

D. Well Log and Samples: Shall be taken in accordance with Specification 02670 -Water

Wells.

E. Hole Cleanliness: The drilled hole shall be kept clean to prevent plugging off small yields of water. Sufficient compressed air, and water as needed, shall be circulated to prevent cuttings from booting or caking walls of hole. Circulation shall be established before drilling begins and shall be maintained throughout the drilling process. The return of cuttings to ground surface shall be continuous. When drilling stops, circulation shall be maintained until all cuttings have returned to ground surface. Failure to maintain a clean hole shall be sufficient cause to abandon hole due to Contractor's actions in accordance with

Specification 02670 - Water Wells.

F. Drilling Fluid Additives: The Contractor shall not use drilling fluid additives unless they have been pre-approved.

G. Recirculation and Mud Drilling: Drilling methods which require circulation of mud or recirculation of drilling fluids will be permitted when geologic conditions dictate or when there is difficulty maintaining an open borehole via air only or air with additives.

H. Drilling Fluid and Water: Drilling fluids containing chemicals of any kind, including muddy water consisting of sediment and suspended sediment, shall be directed away from streams and surface bodies of water. Drilling fluids shall not come into contact with any streams, streambeds, or surface bodies of water. The Contractor is responsible for the cleanup of any streams, streambeds, or surface bodies of water that come into contact with drilling fluid chemicals, including muddy and dirty water, and the costs associated thereof.

I. Hole Size:

1. The pilot hole shall be a minimum of one inch larger in diameter than the drill rod collars, and a maximum of 6-1/4 inches in diameter.

2. The final full-sized reamed hole shall be a minimum 9.5 inches in diameter to allow for a

5-inch ID casing and a 2-inch annulus around the casing.

3. The hole for 8-inch surface casing shall be 12 inches in diameter.

J. Depth of Casing: Casing depth will also be determined in the field and will be based on well log results and Contractor’s log.

02672-5 Mason Pass and Weed Heights Wells

K. Water-Bearing Zones: Slotted casing shall be placed directly opposite from the acceptable producing zone.

L. Surface Casing Installation: Surface casing shall extend 24 inches above finished ground surface. The bottom five feet of the surface casing shall be driven into place. Top of casing shall be square and evenly cut and free of burrs, mushrooming, and torch slag. Additional lengths of surface casing may be required where caving soils are encountered.

M. PVC Well Casing Assembly: PVC well casing, joints, and fittings shall be assembled in accordance with the casing and cement manufacturer's instructions and ASTM specification

D2855.

N. PVC Well Casing Installation: The joined casing string shall be lowered into place with the drilling machine utilizing clamps, elevators, or other mechanical devices.

O. Bottom Cap: A PVC cap shall be solvent welded to bottom of the casing.

P. Centering Guides: Centering guides shall be installed at the top of each screened interval and at a minimum of 50-foot intervals thereafter to the surface.

Q. Backfill: If in the process of locating water-bearing zones, the well was drilled deeper than needed, Contractor shall backfill well to the bottom of the lowest water-bearing strata with an impervious material. Material must provide firm support for casing.

R. Casing at the Wellhead: Well casing shall extend to within 6 to 10 inches below top of surface casing.

S. Gravel Packing: Install gravel-pack material in the annular space between the drilled hole and the casing from the bottom of the slotted casing to a level 10 feet above the slotted casing.

1. Tremie Pipe: Place material with a tremie pipe. As the pack material is being placed, the tremie pipe shall be raised in such a manner that the free fall of gravel-pack material below the bottom of the pipe does not exceed 10 feet. Use the tremie pipe to prove gravel is reaching the bottom.

T. Formation Stabilizer: A formation stabilizer is necessary between the top of the gravel pack and the placement of the surface seal. Formation stabilized should be a clean, 3/8-inch diameter pea gravel or similar sourced material. Place material by pouring into annulus on top of gravel (sand) pack. A weighted rope or wire shall be used as a feeler and continuously pulled up as material accumulate from the bottom up. If bridging occurs, Contractor shall immediately cease from pouring, correct the situation and try again. Between the top of the formation stabilizer and the grout surface seal, a 2-foot interval of bentonite chips shall be added and hydrated.

02672-6 Mason Pass and Weed Heights Wells

U. Bentonite Grout: Mixing of grout shall be based on manufacturers recommendations and the NAC standards in Section 2.1. The mixing instructions shall be explicitly followed.

The Contractor shall measure water with an acceptable measuring device.

3.2 FIELD QUALITY CONTROL:

A. Alignment: If Contractor is not able to install the PVC casing due to poor vertical alignment, the Contractor will be responsible to correct the deficiencies at no additional cost to the Government.

B. Preliminary Well Testing: The Contractor shall make a preliminary yield test, as specified in Specification 02672 - Well Testing, on each water bearing zone penetrated. If water in adequate quantity and quality is obtained the well shall be cased and developed.

3.3 PROTECTION:

A. Drilling Waste: Slope the drill cuttings surrounding the top of the well casing away from the well in all directions. Drilling waste and drilling fluid, including muddy water consisting of sediment and suspended sediment, shall not come into contact with streams, streambeds, or surface bodies of water.

B. Abandonment of the Well: Shall be in accordance with Specification 02670 - Water Wells.

C. Sanitary Protection: Shall be in accordance with Specification 02670 - Water Wells.

A. General:

1. Rig or Standby time will not be paid for.

2. No payment will be made for drilling, installing casing, removing casing, or the plugging of a well abandoned due to Contractor's actions.

3. No payment will be made for time spent developing and testing wells which occur prior to the well being completed (cased, gravel packed and grouted).

4. When the Contracting Officer determines that a well should be drilled deeper, the

Contractor shall be required to drill a maximum of one and one-half times the estimated depth shown on the Work Data Sheet at the unit price bid. The Contractor shall be required to provide all additional work and materials needed to satisfactorily complete the deeper well, at the unit price bid for the respective work performed.

02672-7 Mason Pass and Weed Heights Wells

5. No payment will be made for disinfection of the well, furnishing and installing the cap or compression seal, and casing centralizers. The Contractor shall include consideration for these items in the bid price for other items of the Contract.

A . Units:

1. Drilling the well hole and PVC well casing will be measured and paid for per linear foot. Drilling shall be measured from the ground surface to the bottom of the drilled hole. Any portion of a well hole that is not reamed will be paid for at half the bid price for drilling the well hole. Drilling to set surface casing shall not be measured separately.

2. Steel surface casing will be measured and paid for per linear foot of surface casing installed.

3. Gravel pack/Bentonite, formation stabilizer and grout surface seal will be paid for per linear foot.

4. If the Contracting Officer determines from information obtained from a contractor’s pilot hole that the well site should be abandoned due to no fault of the

Contractor, measurement and payment will be negotiated and the Contract will be modified in writing.

A. Payment: Prices and payment will be full compensation for the work described in this section. Payment will be based on the following pay items:

02671(1) Drilling Pilot Hole (5-inch min. dia.) ............................................................ Linear Foot

02671(2) Drilling Well Hole (9-1/2-inch min. dia.) ..................................................... Linear Foot

02671(3) Furnish and Install 8-inch Steel Surface Casing ............................................ Linear Foot

02671(4) Furnish and Install 5-inch PVC Solid Well Casing ....................................... Linear Foot

02671(5) Furnish and Install 5-inch PVC Slotted Casing ............................................ Linear Foot

02671(6) Gravel Pack/Bentonite Seal…………………………………………………Linear Foot

02671(7) Formation Stabilizer ………………………………………………………..Linear Foot

02761(8) Grout, Surface Seal …………………………………………………………Linear Foot

02672-1

SPECIFICATION 02672

WELL TESTING

A. Specification Includes: Well development and testing.

2.1 EQUIPMENT

A. Well Testing and Developing Equipment: Equipment must at a minimum be able to test and develop the well at the estimated yield at the maximum depth listed in the

Specifications Summary Sheet (SSS). The following equipment shall be on site.

1. Pump Testing Equipment: Pump shall be capable of pumping a minimum of 10 gal/min. at maximum depth of the deepest well. Pumping unit shall be equipped with a hose and valve to regulate the flow for the purpose of establishing yields at various depths.

2. Air Method: Furnish air compressors, hoses, air lines, and any other equipment needed for the air method.

3.1 PRELIMINARY YIELD TESTING OF THE WELL:

A. General: The Contractor shall make a preliminary yield test during drilling operation on each water-bearing zone penetrated. Tests may be conducted by air lift, or pump. If the air lift method yields inconclusive results, the Contractor shall pump the open pilot hole provided that formations are stable and there is no indication of sloughing or squeezing.

3.2 WELL DEVELOPMENT:

A. General: After well has been completely constructed, each slotted casing section to be used for well production shall be developed. Development shall start at the bottom of the slotted casing and proceed upwards towards the top of the slotted casing. Develop the well for a minimum of 30 minutes at the bottom of the slotted casing. If pump overstresses the aquifer, regulate the flow to obtain maximum yield. Pump again near the middle of the slotted casing for a minimum of 30 minutes. After pumping at the various depths stop pumping and let the well fully recover. Contractor shall again pump the well at maximum

02672-2 depth and at maximum yield to full drawdown until water is sand free and clear. Development time should not exceed what is in the Specifications Summary Sheet.

1. Air Development: All wells where yield tests exceed 10 GPM.

2. Pump Development: All wells where yield tests are less than 10 GPM.

3.3 FINAL YIELD TESTING OF THE WELL:

A. General: After the well has been completely constructed, developed, and cleaned, the Contractor shall make a final yield test. Well must be fully recovered from development prior to the final yield test.

B. Yield Test Procedure:

1. Measure and record the depth from the ground surface or top of casing (record which one) to the static water level in the well.

2. Test with equipment used in development. Pump the well at a rate that maximizes production but where drawdown is minimized to reduce the potential for drawing levels below the pump intake.

3. Divert and measure the flow of water through a metering or collection system capable of measuring accurately to within 1/2 gallon per minute. Take a minimum of one water level measurement every 10 minutes for six hours.

4. At the conclusion of the pumping interval, shut the pump off and record recovery water levels every 10 minutes for two hours.

A. Units: Well development and yield testing performed after the well has been completely constructed will be measured for payment. Measurement will be the number of hours, measured in 1/4 hour increments, of development and testing required for the well, beginning when the air lift method is employed and development and testing have begun and/or when the pump testing equipment have been installed and actual development and testing have begun. Preliminary yield testing will also be measured for payment if the Contractor is required to install pump testing equipment in the open pilot hole. Measurement will be the number of actual hours spent from the time the Contractor begins installing the pumping equipment to the time pumping equipment is withdrawn. Standby time will not be paid. Time utilized in assembling, servicing, repairing equipment or any other nonproductive time shall not be paid.

02672-3

A. Payment: Prices and payment will be full compensation for the work described in this section. Payment will be based on the following pay items:

02672(1) Well Development and Testing .............................................................................. Hours

02672-4

SPECIFICATIONS SUMMARY SHEET (SSS)

Project Mason Pass Well Weed Heights Well

Project Location (PLSS) T14N, R25E Sec 19 NE/SW T14N, R25E, Sec 31 SE/NW

Project Location (UTM) 4326450 N, 307221 E 4322512 N, 307459 E

Hydrographic Basin 108-Mason Valley 108-Mason Valley

Target Formation Volcanic bedrock (Yerrington batholith)

Alluvium or alluvium/bedrock contact

Anticipated Yield (gpm) 10 10

Maximum Drill Depth (feet) 250 200

Well Depth (feet) 250 180

5-inch steel well casing (feet) 12 12

5-inch PVC well casing (feet) 200 130

5-inch well screen (feet, slot) 40 40

5-inch well screen (slot size) 0.080 0.050

Gravel Pack (feet) 53 50

Gravel Pack (size) 5/9 sand 8/12 sand

Formation Stabilizer (feet) 145 80

Grout Surface Seal (feet) 50 50

Well Development (hours) 4 5

Pump Test (hours) 6 6

Recovery Test (hours) 2 2

Remarks Location staked at site Location staked at site