Combined Specs Mahogany Butte Well 022021.pdf

FEBRUARY 2021 GENERAL REQUIREMENTS

MAHOGANY BUTTE WATER WELL 01000 - 1

SECTION 01000 - GENERAL REQUIREMENTS

PART 1 - GENERAL

1.1 SUMMARY OF WORK

A. Project Description: Construction of an operable water well including mobilization, all labor, and materials to drill and case the well, well development, and pump test.

B. Location: Work under this Contract is located in Clark County, Idaho. Project Site is on BLM lands located approximately 28.5 miles north-west of Mud Lake, Idaho. The work location is shown on the drawings.

C. Government-Furnished Property: None

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:

ANSI American National Standards Institute

ASSE American Society of Sanitary Engineering

ASTM American Society for Testing and Materials

AWS American Welding Society

AWWA American Water Works Association

CFR Code of Federal Regulations

IEEE Institute of Electrical and Electronics Engineers, Inc. (The)

MFMA Metal Framing Manufacturers Association

MSS Manufacturers Standardization Society of The Valve and Fittings Industry Inc.

NECA National Electrical Contractors Association

NEMA National Electrical Manufacturers Association

NEC National Electric Code

NFPA National Fire Protection Association

NSF National Sanitation Foundation

OSHA Occupational Safety & Health Administration

UL Underwriters Laboratories Inc.

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1.3 DEFINITIONS

A. Approvals: Approval of the submittals is an indication that the Contractor's submittals have been reviewed and that there are no objections, except as noted. Approval of deviations shall apply only to those deviations or omissions from the requirements of the drawings and specifications brought to the Contracting Officer's attention in writing. After approval of an item, submit a substitute for approval when the approved item cannot be purchased or delivered in time to avoid delay in completion of the project.

1.4 SUBMITTALS

A. Scope: Submittals include product data, shop drawings, quality control reports, manufacturers' literature, as-built drawings, samples, and operation and maintenance data.

B. Requirements: Refer to specifications for submittals required. Allow at least 10 working days for review. Submittals shall be delivered to the Contracting Officer’s Representative.

C. 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.

3. Contract number, drawing number, and specification section number to which the submittal applies.

4. Whether this is an original submittal or resubmittal.

5. Each item shall clearly note the manufacturer's name and address, trade name, product, lot, style, color, catalog designation or model number, and locations of use.

D. Contractor shall be required to submit with their bid a complete list of Sub-Contractors which will be used on the project. This shall include at a minimum:

1. Well Driller

1.5 CERTIFICATES OF CONFORMANCE

A. Requirements: The Contracting Officer may permit use, prior to sampling and testing, of materials when accompanied by Certificates of Conformance. Materials used on the basis of a

Certificate of Conformance may be sampled and tested. Installation of materials on the basis of

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.

B. Format: The Certificate of Conformance provided by the supplier shall:

1. State that the named product conforms to the Contract requirements.

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2. 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. Provide the name and address of the manufacturer, the testing agency, and the date of tests.

4. Set forth the means of identification which will permit field determination of the product delivered as being the product covered by the certification.

1.6 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. Equipment: Prior to ordering equipment, verify dimensions and functions of equipment proposed for use including the electrical service requirements.

C. Subcontractors shall not be permitted to work without the physical presence of the Prime

Contractor. The Prime Contractor shall not be permitted to Authorize a Subcontractor as the

Authorized Agent for the Prime Contractor.

1.7 PROJECT/SITE CONDITIONS

A. Access to the Work: Access to the worksite is via HWY 28, 28.5 miles north-west of Mud

Lake, ID and/or 68 miles north-west of Idaho Falls, ID.

B. Environmental Considerations: Areas that have become saturated with oil, gasoline, or bituminous products shall be excavated to a depth of 12 inches beyond the contaminated material; backfill with approved material. Excavated material shall be disposed of offsite in a legal manner. Excavation and disposal of contaminated material shall be performed at no additional cost to the Government. Prescribed measures to prevent water pollution to nearby water resources shall be strictly observed. Silt fencing and other sediment and erosion control measures shall be employed, as necessary.

C. Public Access and Safety: The site will remain open to the public during construction. The

Contractor shall take necessary measures to ensure public safety at all times. Portions of the site can be closed to the public use as needed for construction purposes after being approved by the Contracting Officer. The Contractor shall be responsible for providing, installing, and maintaining barriers and other closure devices needed. Any excavation shall be barricaded or otherwise adequately protected to provide public safety when actual work is not taking place in the excavation.

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1.8 SEQUENCING AND SCHEDULING

A. Work Schedule: The schedule shall be submitted at the pre-work conference. When requested, submit an updated schedule within 3 calendar days. As a minimum, the estimated start and completion dates shall be shown in the estimate.

PART 2 - PRODUCTS (Not Used)

PART 3 - EXECUTION

3.1 PROJECT MEETINGS

A. Pre-Work Conference:

1. Will be held prior to the start of work. The Contractor will be notified in advance of meeting time, date, and place. The purpose will be to review required work, project drawings and specifications, construction schedules, payroll and payments, and administrative provisions of the Contract.

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

3. Be prepared to summarize and explain procedures planned for the project and present the submittals requested in the specifications.

B. Progress Meetings:

1. To be held at the project site, or as determined by the Contracting Officer.

2. May be called by either the Contracting Officer or the Contractor. Request shall state who should attend and include an agenda.

C. Final Inspection:

1. To be held at the project site, or as determined by the Contracting Officer.

2. Notify the Contracting Officer in writing at least 5 working days before the completion date so the Government can schedule final inspection.

3. The superintendent shall be present during this inspection.

3.2 PREPARATION

A. Work Layout: The Government will stake the area for well location.

B. Work Limits and Control Points: Will be established by the Contracting Officer.

3.3 DISPOSAL OF DEBRIS

A. Requirements: Items or debris not designated as salvage for the Government shall become the property of the Contractor. Disposal of materials in a legal manner and payment of fees

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required is the Contractor's responsibility. Sale of material onsite is not allowed unless authorized in writing by the Contracting Officer. When hazardous materials are encountered during demolition operations, comply with applicable federal, state, and local regulations, laws, and ordinances concerning removal, handling, and protection against exposure or environmental pollution. Burning of removed materials is not permitted on the work site.

3.4 AS-BUILT DRAWINGS

A. Requirements: A complete set of full-sized prints, furnished by the Contracting Officer for this purpose only, shall be kept at the site. As the job progresses, continuously maintain as-built drawings of the work. The changes shall be noted legibly in red pencil or red ink. These drawings shall be submitted to the Contracting Officer prior to final inspection.

3.5 WARRANTY

A. Requirements: Materials and equipment furnished under this Contract shall be covered by the most favorable commercial warranties given to customers for such materials or equipment. The rights or remedies provided herein are in addition to and do not limit rights afforded to the

Government by other clauses of this Contract. With respect to warranties, expressed or implied, from manufacturers or suppliers for materials or equipment furnished under the Contract the

Contractor shall:

1. Obtain warranties that would be given in normal commercial practices.

2. Require warranties to be executed, in writing, for the benefit of the Government.

3. Submit warranties to the Contracting Officer prior to the final inspection.

PART 4 - MEASUREMENT AND PAYMENT

4.1 METHOD AND MEASUREMENT

A. Units: There will be separate measurement for individual items of work done under this

Contract. Below includes a general description of work included in each pay item.

B. 01000(01) Mobilization: This item includes all work required to mobilize and demobilize from the project site.

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

2. When 10% of the original Contract amount is earned from other bid items, 100% of the amount bid for mobilization or 10% 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% of the original Contract amount will be paid.

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

C. 02525(01) Drilled Well Hole, 12” Diameter: This item includes all work required to a drill 12” diameter well hole for casing and grout. Measurement for payment will be the number of

Linear Feet drilled, to the nearest whole foot.

D. 02525(02) Drilled Well Hole, 6” Diameter: This item includes all work required to a drill 6” diameter well hole for casing, grout, pump, screen, etc. Measurement for payment will be the number of Linear Feet drilled, to the nearest whole foot.

E. 02525(03) Steel Well Casing, 8” Diameter: This item includes all work and materials required to furnish and install 8” diameter steel well casing. Includes furnishing and installing the required grout for this section of the well. Measurement for payment will be the number of

Linear Feet installed, to the nearest whole foot.

F. 02525(04) Steel Well Casing, 6” Diameter: This item includes all work and materials required to furnish and install 6” diameter steel well casing. Includes furnishing and installing the required grout for this section of the well. Measurement for payment will be the number of

Linear Feet installed, to the nearest whole foot.

G. 02525(05) Stainless Steel Well Screen: This item includes all work and materials required to furnish and install a stainless steel well screen. Includes gravel filter pack around the well screen. Measurement for payment will be the number of Linear Feet installed, to the nearest whole foot.

H. 02525(06) Develop Well: This item includes all work and materials required to develop well.

It will not be measured for payment, but will be paid for as Lump Sum.

I. 02525(07) Pump Test Well: This item includes all work and materials required to pump test well. It will not be measured for payment, but will be paid for as Lump Sum.

4.2 BASIS OF PAYMENT

A. Payment: Payment will be made at the Contract price, as indicated in the Bid Schedule, and will include full compensation for the work described in the Contract. If no pay item exists for a portion of the work, include the costs in a related pay item. Payment will be made under:

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Pay Item Pay Unit

01000(01) Mobilization Lump Sum

02525(01) Drilled Well Hole, 12” Diameter Linear Feet

02525(02) Drilled Well Hole, 6” Diameter Linear Feet

02525(03) Steel Well Casing, 8” Diameter Linear Feet

02525(04) Steel Well Casing, 6” Diameter Linear Feet

02525(05) Stainless Steel Well Screen Linear Feet

02525(06) Develop Well Lump Sum

02525(07) Pump Test Well Lump Sum

END OF SECTION 01000

FEBRUARY 2021 WATER SUPPLY WELLS

MAHOGANY BUTTE WATER WELL 02525-1

SECTION 02525 - WATER SUPPLY WELLS

PART 1 - GENERAL

1.1 SUMMARY

A. This section includes construction of water wells using conventional drilling methods, including record keeping, casing, well screen, gravel packing, formation seal(s), grouting, capping of well, and disinfection of well.

1.2 DEFINITIONS

A. Listed and Labeled: The terms “listed” and “labeled” as defined in the National Electric Code, Article 100.

1.3 SUBMITTALS

A. Drilling Program: Within 10 calendar days after the date of receipt of notice to proceed, submit a complete and practicable drilling program. The program shall provide for orderly performance of the work and be in such form and detail as to show the following:

1. Sequence of drilling operations.

2. Drilling method, including make and model of drill rig.

3. The days of the week and month that work is to be performed.

4. 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.

5. Plan for mud pits and disposal of waste.

6. Development method to be used, including the size and/or rating of the proposed equipment.

B. Certificates of Conformance: Submit a copy of written certification from the supplier of the

Contractor-furnished equipment listed below to be used on this project that it conforms to the requirements of this specification section:

1. Casing.

2. Grout.

3. Well cap.

4. Screen.

5. Gravel Pack

C. Drawings: Submit a copy of drawings or catalog cuts showing water well components. Detail drawings or catalog cuts shall include a cross section showing the relative size, location, and spacing of the well components such as the hole size, outer casing, inner casing, well screen, gravel filter, and grout.

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D. Daily Record: A copy of the daily record, as specified under “Quality Assurance”, below, shall be submitted to the Contracting Officer upon completion of work each day. The form of the daily report shall be approved by the Contracting Officer prior to the start of work. Information recorded by the daily report shall include, but is not limited to:

1. Time of start up and shut down.

2. Time of any standby periods with explanation of reasons therefore.

3. Type of work (drilling, development, test pumping, standby, etc.).

4. Number of personnel and equipment on job.

5. Depths - referenced from “drilling datum” of:

a. Top and bottom of each stratum penetrated.

b. Depths from which cutting samples are taken.

c. Static water level - measured beginning of each shift and at observed changes in water level.

d. Well screens and accessories installed in the well.

e. Perforations of well casing.

6. Type of material encountered.

7. Well casing - Length, size and grade of each piece assembled and cumulative total length of casing assembly.

8. Any drilling difficulties, and adjustments or corrections to the work.

9. Weather conditions.

10. Amount of water disposed of on-site and any difficulties related to disposal.

11. Any problems that might result in a change of conditions or contract negotiations.

E. Driller’s Logs: At the completion of the work, the Contractor shall submit a driller’s log for each hole drilled. The log shall summarize the following information:

1. Size of drill hole and method of drilling.

2. Depths: referenced from “drilling datum” of:

a. Top and bottom of each strata formation encountered.

b. Water bearing formations.

c. Static water level - measured beginning of each shift and at observed changes in water level.

d. Finished well.

e. Well screens and accessories installed in the well.

3. Identify the material in each stratum.

4. Well casing - material, length, diameter, thickness, weight per foot of length and grade of each piece assembled and cumulative total length of casing assembly. Include the depth below grade that casing was installed and any changes in size of casing.

5. Screen: Material, construction, length, diameter, and opening size.

6. Well completion date.

7. Upon completion of the well, the log shall be prepared and signed by the Contractor and submitted to the Contracting Officer for approval.

Samples: Take samples, approximately 16 ounces, of substrata formation at 10-foot intervals and at all pronounced changes in formation throughout entire depth of each well. Carefully

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preserve samples on-site in suitable containers properly labeled for identification (plainly marked to show the well description and the depth below the ground surface at which the sample was taken).

F. Field Test Reports: Submit field test reports for the following:

1. Pump test.

2. Water quality analysis.

3. Plumbness and alignment test.

1.4 QUALITY ASSURANCE

A. Regulatory Requirements: Each system, including equipment, materials, installation, and workmanship shall be in accordance with the standards and regulations of the state of Idaho regarding water wells and water systems.

B. Reference Standard: Well construction shall comply with all applicable provisions of AWWA

A100, IDWR’s IDAPA 37, and ASNI/NGWA-01-14 Water Well Construction Standard.

C. Records and Logs: The Contractor shall keep an accurate daily record of all work. Daily records shall be kept current during the progress of the day’s work in a neat and legible report form. They shall be available for examination by the Contracting Officer at all times during the work.

D. Well Driller Qualifications:

1. The well driller shall be licensed as required by the State of Idaho and shall comply with all the laws of the State pertaining to water well drilling.

2. The Contractor is responsible for submitting all well construction records required by the

State, with a copy to the Contracting Officer.

3. Final well construction information shall be recorded on forms furnished by the State.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Deliver materials in an undamaged condition.

B. Store materials off the ground to provide protection against oxidation caused by ground contact.

Replace defective or damaged materials with new materials at the Contractor's expense.

1.6 SEQUENCING AND SCHEDULING

A. Follow the approved drilling program.

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PART 2 - PRODUCTS

2.1 MATERIALS

A. Casing: Materials specified shall be new and free from defects. No used or old material will be accepted. However, when necessary or desirable to use temporary casing, the temporary casing may be used casing, subject to the approval of the Contracting Officer.

B. Steel Casing: Steel casing shall be either seamless or electric-welded black steel pipe, with either welded or threaded and coupled joints conforming to ASTM A 53 Grade B, or line pipe conforming to API 5L, either Grade A or B. Each section of steel casing shall be marked to show the diameter, standard number, weight, wall thickness, and United States manufacturer.

Physical dimensions shall be as follows:

C. Steel Casing Joints: Shall be watertight and may be either welded or threaded and coupled.

Welded joints shall be full penetration of the casing wall.

D. Disinfectant: Granular calcium hypochlorite compound with 65 percent available chlorine HTH or approved equal. Compound shall be NSF approved for use with potable water.

E. Bio-Degradable Drilling Fluid: NSF 60 certified drilling additives only (i.e. Drispac Plus

Regular, Alcomer 123L, etc.) The material shall be certified by the manufacturer to dissolve and breakdown when dosed with chlorine.

F. Drilling Foam: Certified by the manufacturer for use with approved type of drilling rigs. Shall be NSF 60 certified.

G. Stainless Steel Well Screen: Screen fabricated of ASTM A666, Type 304 stainless steel by welding, with continuous slot, V-shaped openings that widen inwardly. Or provide standard slot size screen (.035). Screen slot openings shall be completely clean and free of burrs, frayed edges and cuttings. Screen shall have a K-packer for insertion into the casing. Johnson or approved equal. Recommend the size of screen to be approved by the Contracting Officer.

H. Filter Packing: After reaching the water-bearing zone and test pumping indicates that gravel packing will be required, obtain samples of the sand formation, and recommend the size and quantity of gravel packing required to the Contracting Officer for approval. Submit material samples and analyses along with the recommendation. Shall be Artificial Filter Pack as per the

IDAPA 37.303.09.

I. Casing Centralizers: If utilized, shall be steel sized to fit the casing and the hole, spaced at 60-foot maximum intervals.

J. Auxiliary Piping: Provide discharge piping to dispose of pumped water during developing and testing of well. Locate the discharge flow at a sufficient distance from each well to prevent flooding, erosion, and flow back into well.

K. Well Cap: Manufactured well seal providing a compression seal with penetration for piping and cables, which fits into the top of the casing and is removable, waterproof and vermin-proof.

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L. Depth Test Apparatus: Provide a depth test apparatus consisting of a pressure gauge, air pump connection, and drawdown tubing. Or can utilize e-tape and/or transducer.

1. Pressure Gauge: Water level gauge, Model # A-566 as manufactured by Ametek Inc., US Gauge Division, or approved equal. Steel case, 4-1/2-inch diameter, ±3-2-3 percent accuracy, 0 to 390-foot range, adjustable dial to permit reading water level in feet below the ground surface.

2. Air Valve: Schrader type, 1/4-inch MPT standard, Type I.

3. Drawdown Tubing: Tubing shall be 3/8-inch (OD) 1/8-inch (ID) polyethylene.

2.2 EQUIPMENT

A. Drilling Equipment: Shall be that required to drill well according to the drilling method specified. Shall be capable of achieving a depth of 1.5 times the depth listed on the Work Data

Sheet.

2.3 MIXES

A. Grout:

1. Type II Portland cement, water, and sand and a maximum of 2 percent calcium chloride.

Portland cement shall meet the requirements of ASTM C 150 and the calcium chloride shall meet the requirements of ASTM D 98. Mixed grout shall be 1-part Portland cement and 3 parts sand mixed with no more than 6 gallons of water per 94-pound sack of cement to form a workable mix. Shall be Idaho Department of Water Resources (IDWR) approved. Water shall be potable.

PART 3 - EXECUTION

3.1 PREPARATION

A. Clearing: Limit worksite clearing to a maximum 50-foot by 50-foot area or as designated by the

Contracting Officer.

B. Site Preparation: Minimize surface disturbance at sites. Level construction sites only as necessary for drilling operations. Cut or fill slopes shall not be steeper than 4:1, unless approved otherwise.

3.2 WELL LOGS AND SAMPLES

A. Well Log: Keep a complete well log as required by State law, and check formations and enter the results in the log for intervals not to exceed 10 feet. The log of the well shall show material penetrated and full descriptive notes made of each stratum found by the drill and difficulties 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

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shall be available for inspection by the Contracting Officer during the drilling operations.

Furnish one copy of the complete log to the Contracting Officer after completion of drilling.

B. Samples: Take a cuttings sample at each apparent change in the materials penetrated, or every

10 feet, whichever is lesser. If drilling is proceeding beyond the estimated depth for the well, take samples at 5-foot intervals. The sample shall be placed on the ground away from operations and labeled in plain view for the Contracting Officer. The Contractor shall recommend a screen size to the Contracting Officer, based on the samples. The Government will have 24 hours to accept or reject the recommendation.

C. Information for State Filing: The Contractor shall obtain all Drilling Permits and furnish the

Contracting Officer with drilling information required by State law for filing on water wells and prepare and submit reports required of the driller by State law. The BLM will obtain the Water

Right.

3.3 WELL CONSTRUCTION

A. Drilling: For the first 38 feet, drill the hole of sufficient diameter to accommodate the specified casing and grout seal, but not less than 10 inches in diameter. Below 38 feet, the hole shall be of sufficient diameter to accommodate the specified 6” well casing. Drill depth shall be as shown on the drawings. Methods of construction shall be as approved by the Contracting Officer and include drilling mud for conventional fluid rotary drilling or reverse circulation drilling. Drill straight, plumb, and circular from top to bottom. The hole below the outer casing shall fully penetrate the water-bearing stratum a sufficient depth to produce the required amount of water without causing excessive velocities through the aquifer.

B. Well Seal: Install the outer casing concentrically in the drilled hole and extend the casing down to a minimum depth as specified in the IDWR issued permit. Provide welded joints in accordance with AWWA C 206. Provide threaded joints in accordance with ANSI/ASME

B1.20.1. Fill the void between the outer casing and the drilling hole with cement grout according to AWWA A 100. Provide a grout retainer at the bottom and ensure that the void is filled in one operation. Temporary outer casings shall be removed.

C. Outer Casing: Install the outer casing concentrically in the drilled hole and extend the casing down to a minimum depth of 38 feet. Provide welded joints in accordance with AWWA C 206.

Provide threaded joints in accordance with ANSI/ASME B1.20.1. Fill the void between the outer casing and the drilling hole with cement grout according to AWWA A 100. Provide a grout retainer at the bottom and ensure that grout does not leak into the well. Grouting shall be done continuously to ensure that the void is filled in one operation.

D. Grout: Grout casing from the bottom upward to effectively seal the annular void. Place grout utilizing a tremie pipe from the bottom up. Grout shall be installed continuously at a rate slow enough to ensure a tight efficient seal. A minimum of 50 percent excess amount of grout material shall be on site during the grout installation procedure. The tremie pipe shall be withdrawn as the seal is placed. Contractor shall utilize a grout retainer or shall allow the cement grout to cure for a minimum of 72 hours prior to resumption of drilling operations.

E. Inner Casing: Install the inner casing and well screens concentrically in the outer casing and drill hole. Fill the void between the outer casing and the inner casing with neat cement grout to

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seal the inside wall of the outer casing to the outside wall of the inner casing. Provide centralizers at the bottom of the casing and at other critical grouting points such as zones of unsuitable water quality. Provide a suitable grout retainer at the bottom of the inner casing so that grout does not leak into the bottom of the well. The hole shall be cased the full depth unless casing of a portion of the well is deemed unnecessary by the Contracting Officer. If the

Contracting Officer determines that casing is not required to full depth in consolidated formations, the casing shall extend at least 5 feet into the formation to assure a proper seat and bottom seal, and the Contractor shall affect a proper seal. The joined casing string shall be installed in a predrilled hole and lowered into place with the drilling machine utilizing clamps, elevators, or other mechanical devices. Casing shall not be dropped onto the bottom of the well hole, nor forced down against the bottom of the hole during installation.

F. Screens: Provide screens at the water bearing layer(s) to be developed to secure available flow as shown in the drawing and the Work Data Sheet. Seal the bottom of the deepest screen with a threaded or welded plug, consisting of the same material and thickness as the screen body, or a welded plate, consisting of the same material and thickness as the screen body or casing. The

Contractor shall select the installation method, in accordance with the screen manufacturer's recommendations. Screens may have either a welding ring or a pipe-thread end fitting. Welds shall be made with stainless-steel welding rod. The screen fittings shall be stainless steel of the same type as the screen.

G. Well Development: Set the casings and allow the neat cement grout to harden a minimum of 72 hours prior to well development. Provide well development in accordance with Article 52 of

EPA 570/9-75-001, except explosives will not be permitted. Furnish pumps, compressors, plungers, bailers, and other equipment required to fully develop the well for the maximum yield of water per foot of drawdown and to limit sand intrusion during the life of the well. Developing equipment shall be of an approved type and of sufficient capacity to remove all cutting fluids, sand, rock cuttings, and any other foreign material. Pump the well free of sand, mud, drillings, and other foreign matter. Maximum sand concentration at the completion of well development shall be 2.0 ppm. The turbidity shall be less than 5 on the Jackson Turbidity Scale specified in

AWWA. The well shall be thoroughly cleaned from top to bottom before beginning the well tests.

3.4 FIELD QUALITY CONTROL

A. Pump Test: Upon completion of the permanent well, provide a temporary pump, meter, air gage, and air line (or E-tape or transducer) in the well for measuring the flow and drawdown.

The temporary pump shall have a capacity of not less than 1.5 times the design flow. After determining the static water level in the well, begin pumping at a rate equal to 60 percent of the guaranteed capacity rate and check the drawdown at 15-minute intervals until drawdown stabilizes. Measure drawdown using the airline method. Continue pumping at that rate until the water level stabilizes and check the water level at 30-minute intervals. Increase pumping rate in uniform increments of 20 percent of the guaranteed capacity rate and repeat described procedure at each increment of increased rate until the capacity of the well is determined or the

160 percent increment of the guaranteed capacity rate is reached. The yield of the well shall be the flow obtained at a drawdown level 10 feet above the top of the uppermost screen.

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1. After determining the safe maximum yield of the well, conduct a continuous 24-hour pump test at that rate and check the drawdown at hourly intervals. Provide pipe and ditches to drain the water from the well site. Submit water disposal methods to the

Contracting Officer for approval. Furnish a complete written log of the pump test, showing static water level, pumping rate, and drawdown at the specified intervals.

Remove airline at completion of pump test.

B. Well Plumbness and Alignment Test: Upon completion of the permanent well, provide a well plumbness and alignment test using a plummet in accordance with Article 51 of the EPA

570/9-75-001. Perform the test on the entire depth of the well. The plumb or dummy shall move freely through the entire depth of the well. The well shall not vary from the vertical in excess of two-thirds of the smallest inside diameter of that part of the well being tested per 100 feet of depth. Correct defects in plumbness and alignment, and repeat test until the work is in compliance with contract requirements.

3.5 DRILLING WASTE

A. Waste Disposal: Drilling waste such as drilling fluid and drill cuttings shall be removed so that wastes will not interfere with the pumping equipment and will not pollute surface waters or cause contamination of the well. Dispose of drilling waste by spreading the cuttings onsite to a depth of no more than 1”, unless otherwise authorized in writing by the Contracting Officer.

3.6 DISINFECTION

A. General: After the well has been completed, including developing and testing, installation of permanent pump, or at time of tests for yield and drawdown test, whichever is later, clean and disinfect well, equipment, and material in accordance with Article 54 of EPA 570/9-75-001 and as specified in this section.

B. Interim Disinfection: When a delay of 3 or more days will occur between the completion of the well and the regularly scheduled well disinfection, provide an interim disinfection. Apply 10 percent of the amount of an approved disinfectant in liquid form that would be required for final disinfection to the well. Use a hose or tremie pipe of sufficient length to extend to the bottom of the well and raise and lower the pipe during application to assure uniform distribution of the disinfectant solution throughout the well.

C. Disinfection of Wells:

1. Dry Chlorine Compounds: Use dry chlorine compounds to disinfect water table wells.

Move a doubly capped, perforated, pipe container filled with granular chlorine compound up and down the entire well bore until the material has dissolved. Add a stock solution producing a minimum of 200 ppm of available chlorine in the well at intervals from top to bottom and agitate it to distribute the solution evenly throughout the well.

2. Stock Solution: The chlorine solution used for disinfecting the well shall be of such volume and strength and applied so a concentration of at least 500 ppm of chlorine is obtained throughout the well.

MAHOGANY BUTTE WATER WELL 02525-9

3.7 SANITARY PROTECTION OF WELL

A. General: 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 cap compression seal designed to prevent pollutants from entering the well. The watertight casing or pitless wellhead shall extend above the well platform as shown on the drawings. Seal or screen (#24 mesh) equipment that permits direct access to the well to prevent entrance of foreign matter or contaminants.

C. Grading: Slope the ground and concrete slab immediately surrounding the top of the well casing or pitless wellheads away from the well in all directions, as shown on the drawings.

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.

3.8 CLEANUP

A. Requirements: Upon completion of the well construction and other incidentals, remove the debris and surplus materials resulting from the work from the jobsite.

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