B01 Attachment 10 Individual Household Water Systems.pdf

Pamunkey Indian Tribe Construction of Sanitation Facilities February 2022 Individual Water Systems

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SECTION 02512

INDIVIDUAL HOUSEHOLD WATER SYSTEMS

PART 1 - GENERAL

1.01 SUMMARY

A. This section includes the installation of submersible pumps, drop pipe, electrical cable and controls, pressure tanks, service lines, and pitless units from the well to the household.

1.02 RELATED WORK (as applicable)

A. Section 02315 – Excavation, Trenching and Backfill B. Section 02525 – Individual Well Drilling

1.03 REFERENCES

A. ASTM A 53 – Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and

Seamless

B. ASTM D 1785 – Polyvinyl Chloride (PVC) Plastic Pipe, Schedules 40, 80, and

C. AWWA C901 – Polyethylene (PE) Pressure Pipe and Tubing, 1/2 Inch Through 3 Inch, for Water Service

D. National Electric Code (NEC)

1.04 SUBMITTALS

A. Heavy Duty Brass Check Valve B. Submersible Cable C. Submersible Pumps D. Drop Pipe E. Buried Cable F. Water Service Line and Fittings G. Pressure Tank and Switches H. Lightning Arrestor (if not built into motor) I. Tubing/Pipe and Fittings J. Flow Control Valve K. Pitless Adapter and Well Cap

PART 2 - PRODUCTS

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2.01 SUBMERSIBLE PUMPS

A. Submersible pumps shall be sealed and constructed of all corrosion resistant materials including all exposed parts of both the pump and motor.

1. Impellers and diffusers shall be constructed of bronze, stainless steel or plastic.

2. Pump shaft shall be hexagonal or splined stainless steel and connected to the motor shaft with a splined coupling.

3. Pump casing shall be bronze, brass or stainless steel.

4. Motor adapter and pump discharge head shall be bronze, brass or other corrosion resistant material.

5. Motor casing and end caps shall be stainless steel, brass, bronze or other corrosion resistant material.

B. Pump Requirements:

1. Pump Design for 3 Wire Installation High Torque Motor

2. 230 Volt Operation

3. Overload Protection

4. Solid State Starting Switch

5. NEMA Standard for Universal Motor Replacement

7. 1/3 horsepower pumps shall have a pumping capacity of 8 gpm against a total head of 150 feet.

8. 1/2 horsepower pumps shall have a pumping capacity of 8 gpm against a total head of 200 feet.

9. 3/4 horsepower pumps shall have a pumping capacity of 8 gpm against a total head of 280 feet.

10. 1 horsepower pumps shall have a pumping capacity of 8 gpm against a total head of 360 feet

11. A check valve shall be installed in the pump.

C. Size the pump to be installed based on test pump data and well log.

D. Lightning protection shall be built into the pump motor or a submittal for the arrestor and installation method shall be provided.

2.02 SUBMERSIBLE PUMP CABLE

A. Use RHW insulated and jacketed, U.L. approved, rated at 600 volts, manufactured in accordance with the NEC and be a minimum size of No. 12.

1. Submersible pump cable shall be Essex CPE, MilSpec Milpreme double insulated or approved equal.

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2. THW insulated and jacketed pump cable meeting the above requirements such as Centriline HILO Supreme or approved equal may be substituted for the RHW standard.

B. Allowable voltage drop through the cable, from the electrical service to the pump motor, shall be in accordance with pump manufacturer’s recommendation.

C. Waterproof splice shall be in accordance with pump manufacturer’s recommendation.

2.03 DROP PIPE AND FITTINGS

A. Steel Drop Pipe

1. Conform to ASTM A53

2. Pipe shall be Schedule 40 galvanized steel with a nominal size of 1-inch.

3. Galvanized steel couplings shall be used to connect pipe sections.

B. PVC Drop Pipe

1. Conform to ASTM D1785

2. Pipe shall be threaded Schedule 80 with a nominal size of 1-inch.

3. Couplings shall be machined from extruded, not molded, PVC.

C. PE Drop Pipe

1. Conform to AWWA C901

2. Pipe shall be ultra-high molecular weight, IDR 7, 1-inch IPS with a minimum pressure rating of 160 psi.

3. Torque arrestor shall be equal to Merril No. STA-48.

4. Cable protector centering device shall be equal to Merril No. CG-46.

D. Check valves shall be equal to Clayton Mark No. 6300.

E. Flow control valves shall be equal to a Merrill Dole Valve, G series flow regulator.

2.04 WATER SERVICE LINE

A. Conform to AWWA C901.

B. Ultra-high molecular weight, PE 3406, 3408, 3608, or 4710, IDR of 7 or 9 with a minimum pressure rating of 160 psi, and suitable for use with potable water.

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2.05 PIPING AND FITTINGS

A. Copper tubing: ¾ inch seamless, thick-wall type L with a minimum wall thickness of 0.045 inches.

1. Only copper tubing is allowed for installations under mobile homes and other homes without a basement where piping is located in an unheated space.

B. PEX tubing: ¾ inch cross linked polyethylene tubing, ASTM F876 and F877, and approved for use with potable water.

C. Copper tubing fittings: Compression type connections or adapter with union used for copper pipe equal to those manufactured by Hays Manufacturing Company, A.Y. McDonald, Mueller Company or Ford Meter Company.

D. PEX tubing fittings: Crimp fittings specifically manufactured for use on PEX tubing.

E. No galvanized fittings are allowed.

2.06 PIPE HANGERS

A. Shall be made of a material compatible with piping material.

B. Shall be of sufficient strength to support the pipe at full capacity.

C. Shall not affect pipe integrity by either abrading, cutting or bending of pipe.

2.07 PRESSURE TANK

A. Supply pressure tanks precharged in accordance with the manufacturer’s recommendations, for a 30 to 50 psi operating range, having a sealed container or diaphragm that prevents contact of water with air.

B. Tanks shall be lined with a noncorrosive material that does not impart taste or odor to the water and provide a minimum of 8.9 useable gallons of draw down.

C. Tanks shall be equal to Well-X-Trol Model WX-203 or Champion Model CM-

8003.

D. Pressure switches shall be equal to Square D Model FSG2.

2.08 PLUMBING TREE

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A. The plumbing tree in front of the pressure tank includes the following:

1. ¼ turn brass lever ball valve

2. Metal sample faucet with smooth bore hole or a hose bibb with vacuum breaker. Minimum diameter ¼ inch.

3. Pressure switch

4. Pressure gauge

5. Dielectric union

2.09 BURIED CABLE

A. Underground wiring shall be type UF for direct burial with a minimum size of No. 12.

B. Size underground wiring to limit the total voltage drop from the electrical service to the pump motor in accordance with manufacturer’s recommendations.

2.10 PITLESS ADAPTER AND CAP

A. Steel Cased Wells: Weld-on type, equal to Maass Model J, with 1-inch size water outlet.

B. PVC Cased Wells: Equal to Safe-T-Seal, with a 1-inch water outlet.

C. Cap

1. Vented, weather and vermin proof cap with gasket. All nuts and bolts shall be made of non-corrodible material.

2. Screened downward facing vent not less than ¼-inch in diameter.

a. Screen shall be made of non-corrodible material.

PART 3 - EXECUTION

3.01 GENERAL

A. Obtain Engineer’s approval to install water system if well yields less than 5 gpm.

B. Install water system in accordance with state and local codes.

3.02 PITLESS ADAPTER

A. Steel Cased Wells

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1. Weld onto casing 2 feet below grade.

2. Seal with neoprene o-ring.

3. Conform to state and local codes.

B. PVC Cased Wells

1. Install onto casing 2 feet below grade.

2. Connection shall be watertight.

3.03 WELL CAP

A. Install well cap tightly to top of well casing to provide sanitary seal.

B. Seal any unscreened openings until conduits are connected.

3.04 PUMP AND DROP PIPE

A. Install pump a minimum of 5 feet to a maximum of 20 feet below the drawdown level measured from the top of pump unless otherwise directed by the Engineer.

B. Do not install pump in well screen unless otherwise directed by the Engineer.

C. Set and install drop pipe and submersible pump in accordance with state and local codes.

1. If a change in pump size is required, the Contractor, Engineer, and Owner shall negotiate a new pump price.

D. Install a check valve midway between the pump and pitless adapter in drop pipe greater than 200 feet.

E. Use tape or approved joint compound on all threaded connections.

F. The depth limitation for using Schedule 80 PVC is 400 feet.

G. PE Pipe

1. Install PE pipe in one single length (no couplings) from the pitless unit to the submersible pump.

2. Install an approved torque arrestor at the pump.

3. Install cable protector devices every 50 feet above the pump to center the

PE pipe in the casing.

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4. The depth limitation for PE pipe is 300 feet and the maximum pump size is 1 horsepower.

H. If required by the Engineer, install flow control valve between the pitless spool and the drop pipe.

3.05 SUBMERSIBLE CABLE

A. Securely attach submersible pump cable to the drop pipe every 10 feet, using tape or other method approved by the Engineer.

B. Provide an extra 12 inches of cable under the well cap.

C. The only splice allowed in the pump cable will be at the motor and the splices shall be made using taped, mechanical or resin splices.

D. Test cables for leakage or shorts using an ohmmeter or megger.

3.06 TRENCH EXCAVATION AND BACKFILLING

A. Refer to Section 02315 for excavation and backfilling requirements.

3.07 WATER SERVICE LINE

A. Bury water service lines 2 feet deep.

B. Connect water service line to the pitless adapter with a brass or bronze swing joint connection as shown on the plans.

C. If the water line from the house has been installed, connect the well water service line to the stubbed out line from the house. Otherwise, extend into the house and connect into the plumbing for the hydropneumatic tank.

1. Provide a watertight seal on the penetration through the wall.

2. For connecting beneath the home, install pipe hangers at a maximum spacing of 6 feet apart for all horizontal copper tubing and 2 feet apart for all horizontal PE pipe inside the home.

D. Make connections with brass insert adapters and two stainless steel hose clamps or non-flare brass compression fittings.

E. Where designated by the Engineer, terminate the water service line 5 feet from the house and cap.

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1. Mark the end with a 2 by 4-inch stake painted blue extending 1-foot above grade and 4 feet below grade.

3.08 UNDERGROUND UTILITY CONFLICTS

A. Refer to Section 02315.

3.09 BURIED CABLE

A. Install underground cable in accordance with local utility regulations, the NEC, applicable state and local codes and the attached drawings.

B. No underground splices are allowed.

C. Control power to each unit with a fused disconnect switch or manually reset circuit breakers placed in the home, where possible, or otherwise on a power pole near the well.

D. Provide disconnecting means located in site of controller location.

E. Connect underground wiring to the pump cable under the well cap. Provide an extra 12 inches of slack cable under the well cap.

F. Securely attach the ground wire to the casing with a threaded metal screw tapped into or drilled through the casing.

G. Ground the submersible pump and well casing to the panel in accordance with the NEC.

H. Install wiring in a rigid galvanized steel or Schedule 80 PVC conduit at the electrical entrance and the wellhead to 2 feet below ground.

1. Conduit end shall be smooth and free of sharp edges

2. Snuggly fit the conduit end into the well cap. Maintain sanitary seal.

3. Bushings are required as shown on the detailed drawing.

I. Provide sufficient slack in the wire to prevent separation of the cable.

J. Underground wire may be placed in the same trench and located at the same depth as the water service line.

K. For mobile homes and houses without basements, install underground wire in rigid conduit when placed below the structure.

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3.10 CONNECTION OF WATER SERVICE LINE TO HOME

A. Install only copper tubing for installations under mobile homes and other homes without a basement where piping is located in an unheated space.

1. Install copper tubing/pipe from freezeless riser or service line riser to connection to the home.

2. Utilize fittings to change direction of piping or make long radius bends.

Kinks in the copper tubing are not allowed.

3. Solder joints with lead free solder.

4. Heat tape shall be installed along the copper tubing/pipe from the end of the freezeless riser or service line riser in accordance with the manufacturer’s recommendations.

5. Preformed foam pipe insulation shall be installed from the end of the freezeless riser or service line riser to the connection to the home in accordance with the manufacturer’s recommendations.

i. Heat tape and copper tubing/pipe shall be wrapped completely with the performed foam pipe insulation.

6. Contractor shall verify there is adequate wraps of heat tape around the copper tubing/pipe and that the supplied preformed pipe insulation is of adequate thickness to prevent freezing of the copper tubing/pipe.

7. Plug heat tape into dedicated outlet underneath the home. If there is no outlet, the homeowner is responsible for installation of an outlet for the heat tape. Extension cords are not allowed. Contractor shall notify the engineer and homeowner if there is not an electrical outlet to plug in the heat tape.

8. If service line riser is installed, use one run of heat tape for entire length of service line riser and tubing/piping for connection of water service line to the home.

9. Connection of the water service line to the home within a heated space shall be done with similar pipe material as the house plumbing with either copper or PEX tubing as specified.

3.11 BACTERIOLOGICAL SAMPLE

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A. Provide bacteriological sample for water system after system has been installed and flushed.

B. Contractor shall inform the homeowner(s) not to consume any water until a safe bacteriological and chemical analysis result has been received.

3.12 PRESSURE TANK AND FITTINGS

A. Place tanks inside home as located by the Engineer and the homeowner.

B. Install tanks as shown on the attached drawings, including pressure gauge, pressure switch, brass tank cross, sample faucet, ball valve and all miscellaneous fittings and adapters.

1. Install sample faucet a minimum of 12-inches above finished floor elevation.

C. Use leveling blocks or hangers when installing tanks.

D. Connect tank to existing plumbing if available.

E. Install tank so that it can be connected to house plumbing.

F. For tanks with a steel inlet fitting use a dielectric union, installed between the inlet pipe and the brass cross.

G. Install tank and cross such that the tank can be easily removed.

H. Install pressure relief valve if required.

3.12 AS-BUILTS

A. Provide as-built information on each system in accordance with Section 01780 and Section 02525. Use IHS forms (if supplied) by the Engineer.

B. Provide Engineer with the pump setting depth.

END OF SECTION