A04_Eastern_VA_Rivers_Well_SOW.pdf

STATEMENT OF WORK

DRILL WATER WELL

EASTERN VIRGINIA RIVERS NWR

WARSAW, VIRGINIA

PART 1 - GENERAL

1.01 SCOPE

A. The work of this section consists of drilling, developing, and testing a new 4 inch diameter cased artesian water supply well. The location of the work site is at the Eastern Virginia Rivers National Wildlife, 336 Wilna Road, Warsaw, Virginia 22572.

B. The new well shall be capable of delivering a desired safe yield of 10 gallons per minute of clean, fresh, potable water. The estimated depth of the new well shall be determined in the field with concurrence from the facility manager. The area where the well is to be drilled may have three strata that typically yield decent water, one is from 200-300 feet deep, another one is 400-600 ft. If there is a need to drill to the 800 foot deep strata, the facility manager shall made aware of this and provide approval before proceeding.

C. The proposed depths are estimates only and the Government reserves the right to increase or decrease the depth of the well under a modification to the contract if field conditions so warrant.

D. The location of the new well shall be based upon site conditions, and in compliance with the Virginia Department of Heath requirements for minimum distance from a septic system, a building foundation, and from the building foundation if it is termite treated.

Coordinate the proposed location of the well with Bill Crouch.

E. The approximate location for the new well shall be agreed upon with Bill Crouch. Should unforeseen site conditions arise during the siting and drilling of the well, contact the Contracting Officer and the Contracting Officer's representative, and notify the on-site Government representative Bill Crouch.

F. The contractor shall provide a proposal for the drilling of the water well and appurtenant work.

1.02 PERMITS

A. The Contractor shall coordinate with the Refuge to obtain and pay for the required documents for the Well Construction permit from the local State Health Department.

Contractor shall apply and pay for any required permits from authorized agencies. No field operations shall commence until necessary approvals have been obtained. All installations shall meet the minimum requirements of the State and Local Public Health

Agencies.

1.03 QUALITY ASSURANCE

A. Perform work in accordance with the State of Virginia Regulations, and the American

National Standards Institute/American Water Works Association.

1.04 SUBMITTALS

A. Submit Manufacturer's data with application and installation instructions for the well screen.

B. Submit Construction Methods and Materials descriptions on well construction, developing and testing.

C. Product Data: Submit manufacturer's product data covering description of pitless adapter, pump, standard details and installation recommendations.

1.05 GENERAL SAFETY REQUIREMENTS

A. The Contractor shall be responsible for strict compliance with all provisions of Occupational Safety and Health Administration (OSHA) requirements 29 CFR 1910 and

29CFR 1926.

PART 2 - PIPING

2.01 WELL CASING AND INSTALLATION

A. Material - The well casing shall be 4" diameter pipe. The casing material shall be Polyvinyl Chloride (PVC) pipe conforming to American Society for Testing and Materials ASTM F480.

B. Casing and joints shall be watertight.

2.02 WELL SCREEN

A. Should unconsolidated water bearing strata be found, Contractor shall set a well screen as specified below.

B. The well screen shall be of the continuous slot, factory wound type made by wrapping

V-shaped PVC wire around a system of vertical ribs. Each joint between horizontal wires and vertical ribs shall be solvent welded. All necessary fittings shall be provided.

C. Screen length shall be determined and agreed upon between the Government and the

Contractor.

D. Contractor shall assume responsibility for selection of proper size screen openings.

Screens shall be selected so that the full capacity of the well will be transmitted through the slot openings. Screen slot size shall be determined by a soil sieve analysis. A fitting shall be provided to close the bottom of the screen. Details or catalog cuts of the screen to be used shall be submitted to the Government for approval prior to installation.

2.03 PITLESS ADAPTER

A. Description: Standard pitless case, watertight cap, 4" plain spool with neoprene "0" ring seals and dresser type coupling suitable for connection to the 4" PVC pipe casing.

2.04 WELL PUMP

A. Capacity: 10 gallons per minute.

B. Type of Pump: Submersible, designed for installation within a 4" SDR 17 or approved equal well casing.

C. Motor: One half HP minimum designed to operate on single phase, 60 HZ A.C. Motor shall be a three wire design with built in lightning protection, and built in auto-reset thermal overload protection in the motor. Wire pump into in accordance with electrical requirements as specified and as described in the manufacturers instructions.

D. Drop pipe size shall be as recommended by the submersible pump manufacturer.

2.05 DETECTABLE WARNING TAPE

A. Detectable warning tape; Acid- and alkali-resistant polyethylene film warning tape manufactured for marking and identifying underground utilities, minimum 6 inch wide and 4 mils thick, continuously inscribed with a description of utility, with metallic core encased in a protective jacket for corrosion protection, detectable by metal detector when tape is buried up to 12 inches deep; colored as follows:

1. Red: Electric.

2. Blue: Water systems.

2.06 APPURTENANT ITEMS

A. The Contactor shall furnish and install all appurtenant components and items for a fully operational well system.

PART 3 - ELECTRICAL

3.01 SCOPE

A Provide and install electrical power wiring and components to connect the well pump to the electrical supply. All electrical work shall comply with National Electric Code (NEC) requirements. The estimated distance to the electrical power source is 10 feet.

3.02 QUALITY ASSURANCE

A. All work shall comply with:

1. Underwriters Laboratory (UL) Compliance and Labeling: Comply with applicable requirements of UL Standards, and other standards pertaining to wiring and accessories. Provide equipment that are UL-listed and labeled.

1. NEC Compliance: Comply with NEC as applicable to installation of, cutout boxes, and underground direct burial cables.

3.03 CONDUCTOR AND INSULATION APPLICATIONS

A. Underground, direct burial pump power supply wiring: Type UF single or multi-conductor cable, #10 copper conductor or larger, as recommended by pump manufacturer 24" deep. Place warning tape 12" below finished grade.

PART 4 - WATER WELL INSTALLATION

4.01 DRILLING WELL

A. Drill the well in compliance with local, State, and Federal requirements or recommendations. Use suitable drilling equipment to the drill the required hole suitable to install the well casing, and install materials. Locate any drilling fluid pits that may be required at least six feet from the top of the well. Contractor shall dispose of drilling fluid, cuttings, and discharged water.

B. Provide and install pitless adapter, pump, drop pipe, wiring and accessories in accordance with manufacturer's instructions. Provide all wiring that is necessary for a complete and functional well.

C. Install underground pump power supply wiring a minimum of 24" below grade. Place and compact backfill materials in continuous layers not exceeding 6 inches in depth.

Compact to 95% of maximum dry density. Place detectable warning tape twenty inches (20") above conduit in trench.

D. Well Identification Tag: The well driller, immediately after completion of the well, shall attach to the well the identification tag furnished by the Approving Authority. This tag shall be fastened to the well casing approximately 6 inches above finished grade by means of a 1/2 inch stainless steel band or other strapping device approved by the Approving Authority. Devices which use a screw-type tightening mechanism are not acceptable.

4.03 DEVELOPING AND TESTING

A. The well shall be developed by an acceptable method the approved by the Contracting

Officer, in a manner that will not cause undue settlement and disturbance of the strata above the water bearing formation, nor disturb the seal around the well casing.

Development shall continue until water pumped from the well at the maximum test pumping rate is clear and free from sand. After developing, Contractor shall remove any formation materials brought into the well by the development process.

4.04 TESTING THE WELL

A. The well shall be tested by pumping to determine the yield and drawdown. Use a test pump of approximate capacity of 10 GPM. Test for two hours after the pumping water level reaches stability.

4.05 DISINFECTING THE WELL

A. The well shall be disinfected after the well has been tested for yield but before the test pump has been removed from the well and before collecting any samples for determining microbiological quality.

B. Disinfect well by introducing a chlorine solution into the well in such a manner that a concentration of at least 50 PPM of available chlorine exists in all parts of the well at static conditions. The chlorine solution will be introduced into the well in such a manner that the well surface above the static level will be completely flushed with the solution.

A minimum of 2 hours contact time shall be provided before pumping the well to waste.

4.06 CAPPING THE WELL

A. During well construction, temporarily cap well in such manner as to prevent any pollutants from entering the well.

4.07 WELL LOG

A. Daily, log and record for the well all materials passed through and the depths at which the changes in the formations occur, together with such other information. Samples of the materials found in each stratum shall be taken at intervals of not more than five feet, preserved in receptacles furnished by the Contractor, plainly marked to show the well and the depth below the ground surface from which the sample was obtained. The log of the well shall show all material penetrated and full descriptive notes made of everything found by the drill and of all difficulties or unusual conditions met in drilling. All water-bearing strata shall be described in special details as to whether the material is loose, compact, its color and, if gravel, whether it is water worn or angular.

B. Upon completion of the well, the log shall be signed by the Contractor and submitted with the final report for the well.

4.08 FINAL REPORT - RECORDS

A. The Contractor shall provide the Contracting Officer with a water well completion report suitable for forwarding to the State Of Virginia. The final report shall contain (at a minimum) the following information:

1. A well log record of the materials penetrated and the depth at which they were encountered.

2. A complete casing and screen location record showing lengths of casing and screen used and the locations of any packers, plugs, and seals.

3. All pumping test data including static water level, length of test, rate of discharge and all drawdown measurements.

4. Contractor shall submit water samples to a certified laboratory for chemical and microbiological analysis; the results of the analysis shall be sent to the Government.

5. The water testing shall follow the latest requirements of the State and Local Public Health

Agencies.