3-Technical Provisions (Revised).pdf

TABLE OF CONTENTS

PAGE

1. TP 3 EXCAVATION, TRENCHING, AND BACKFILLING………………………

3. TP 11 INDIVIDUAL SEPTIC TANK…………………………………………..…

4. TP 12 INDIVIDUAL LIFT STATION………………………………………………………...9

4. TP 32 INDIVIDUAL WATER SYSTEMS…………………………………………………...13

*SEE DESIGN ATTACHMENT FOR DRIP DISTRIBUTION SYSTEM SPECIFICATIONS.*

1/06 Technical Provisions- TP 3.0 Excavation, Trenching, and Backfilling Page 1

TECHNICAL PROVISION 3.0

EXCAVATION, TRENCHING, AND BACKFILLING

3.01 Scope of Work

The work covered by this section includes the furnishing of all plant, labor, tools, equipment, and material, and performing all operations in connection with the excavation, trenching, and backfilling for the installation of all pipelines, structures, and accessories, all in accordance with these technical provisions and applicable drawings.

3.02 Protection of Excavation

In conformance with applicable safety regulations, the Contractor shall provide suitable shoring and sheeting to protect all excavations and provide safe working conditions for workers.

3.03 Excavation

3.03.01 General

All excavation required for the performance of this contract shall be made by open cut methods unless otherwise shown on the drawings, required by applicable encroachment permits, or approved in writing by the Project Manager.

3.03.02 Trench Excavation

The sides of all trenches for the installation of utility piping systems shall be as nearly vertical as soil conditions permit below the level of the top of the pipe. The width of the trench shall not be less than 12-inches or more than 24-inches wider than the outside diameter of the pipe barrel. Trench excavation shall be centered on pipe alignment such that a minimum clear space of 6-inches is provided on each side of the pipe. Trench width above the level of the top of the pipe may be as wide as necessary for shoring and sheeting, and for proper installation of the work.

The depth of all trenches shall be as indicated on the drawings. If not otherwise specified, the depth of all trenches shall be sufficient to provide a minimum cover of 24-inches at all locations after final backfilling.

Unless otherwise required by applicable permits to be less, the maximum length of trench that may be left open at any one time shall not exceed 500-feet. No trenches shall be left open unless otherwise permitted in writing by the Project Manager.

All trench excavation shall comply with Federal and local OSHA regulations for trench safety.

1/06 Technical Provisions- TP 3.0 Excavation, Trenching, and Backfilling Page 2

3.03.03 Pavement Cutting

Where it is necessary to remove sections of asphalt pavement, the asphalt shall be saw-cut with approved equipment in a neat line 6-inches back from the outside edge of the excavation in order to provide a key when restored, or as approved by BIA roads permit or Tribal Manager.

Where it is necessary to remove sections of concrete pavement, the concrete shall be saw-cut to a depth of not less than 2-inches with neat, vertical, true lines in such a manner that the adjoining surface will not be damaged.

3.04 Placement and Compaction of Pipe Embedment and Backfill Material

3.04.01 Pipe Embedment

Pipe embedment is defined as that material required to bring the trench bottom up to grade and that material placed alongside and above pipe to a level of at least 6 inches over the top of the pipe. The pipe embedment area is divided into three zones as defined below.

Bedding: Bedding is that portion of pipe embedment zone beneath the pipe. If the native soil is suitable for bedding the pipe without over- excavation, the bottom of the trench shall be accurately shaped such that one fourth of the pipe circumference is provided with uniform bearing and support for each section of the entire length of the pipe. Imported bedding material shall likewise be placed to provide uniform and adequate longitudinal support under the pipe. Bedding material shall be placed and compacted in lifts not to exceed 6-inches in loose measure.

Haunching: Haunching is that portion of the pipe embedment zone from the bottom of the pipe to the springline of pipe. Haunching material shall be placed and consolidated to provide adequate side support to the pipe while avoiding both vertical and lateral displacement of the pipe from proper alignment.

Initial Backfill: Initial backfill is that portion of the pipe embedment zone from the springline of the pipe to a minimum level of 6-inches over the top of the pipe. Initial backfill material shall be placed and compacted in lifts not to exceed 6 inches in loose measure. Compaction shall be performed in a manner to avoid damage and disturbance of the embedded pipe.

3.04.02 Compaction

Unless otherwise specified by applicable permits or roadway authority, bedding, haunching, initial backfill, final backfill, and gravel resurfacing shall be compacted to the following percent of the maximum density as determined by ASTM D1557. In-place densities of materials shall be determined by the sand-cone method, ASTM D1556 or by nuclear methods, ASTM D2922.

1/06 Technical Provisions- TP 3.0 Excavation, Trenching, and Backfilling Page 3

Percent of Maximum Density

Location Bedding Haunching Initial Backfill

Final Backfill

Roadways and Driveways 95% 95% 95% 95%

Unimproved Surfaces, Fields, Etc. 90% 90% 70% 70%

3.05 Surface Restoration and Resurfacing

3.05.01 General

The inclusion of a bid item and estimated quantity for asphaltic, concrete, or gravel resurfacing in the Bid Schedule indicates that these items are probable. However, the exclusion of these items from the Bid Schedule does not preclude the possibility that they will be required, merely that they are not anticipated. If unanticipated resurfacing is required, unit prices will be negotiated between the Contractor and the Contracting Officer.

3.05.02 Surface Restoration

After the piping and structures have been installed and all backfilling has been completed, areas which were disturbed shall be brought to true grades. All slopes shall be trimmed and dressed, and all surfaces graded to maintain existing drainage. All streets, alleys, driveways, sidewalks, curbs, or other surfaces which have been disturbed or damaged shall be resurfaced with like materials to a condition equal to or better than the original condition. All excess excavated material shall be properly disposed of by the Contractor.

3.05.03 Asphaltic Resurfacing

At all locations where asphaltic resurfacing is required, a compacted gravel base, 6-inches in depth shall be placed prior to placement of the asphaltic wear course. This base course shall be 95 to 100 percent 3-inch minus gravel with not more than 40 percent passing a 0.0165 inch square opening (No. 40 sieve). Asphalt shall be plant mixed, with certification that the mix meets the requirements of the applicable roadway authority.

Except where greater thickness is required by applicable roadway authority, the minimum thickness of the asphalt shall be the greater of 2-inches or that of the existing adjacent asphalt. Placement of asphalt shall be in lifts not exceeding 2-inches. Compaction shall be accomplished by pneumatic-tired or steel rollers throughout the spreading operation.

Final rolling shall be by steel roller. No surfacing shall be placed while the subgrade is wet, if it is raining, or if the temperature is below 40 degrees F. All edges shall be clean and tack coated prior to placement of the patch.

1/06 Technical Provisions- TP 3.0 Excavation, Trenching, and Backfilling Page 4

3.05.04 Gravel Resurfacing

All gravel resurfacing shall be done on a properly compacted subgrade. The gravel shall be spread uniformly and compacted to a minimum thickness of 3-inches. The gravel shall conform to the following gradation requirement.

3.06 Open Cut Road Crossing for Water and Sewer Service Lines

Open cut water and sewer service line crossings shall be completed at all locations shown on the site plan. The Contractor is responsible to comply with all local, county, Tribal and BIA road crossing provisions whether a permit was issued or not. PVC encasement pipe shall be the diameter shown on the drawings and shall conform to material specification ASTM D1784, Type 1, Grade 1, manufacturing specification ASTM D2241, and the pipe shall be PVC schedule 80. All PVC pipe joints shall be rubber compression ring type with rubber gaskets conforming ASTM F477, and equal to J-M Ring Tite PVC Pressure Rated Pipe, or PWPipe TwinSeal PVC.

Steel encasement pipe and fittings shall be the diameter shown on the drawings and shall be Schedule 40 and shall conform to ASTM A120. The pipe shall be joined by the use of threaded steel couplings

3.07 Bored Type Road Crossing for Water and Sewer Service Lines

Water service lines crossing roads or rights-of-way (ROWs) which cannot be open cut, and if noted on the site plan, the crossing shall be bored. The Contractor shall bore the crossing by using a pneumatic or hydraulic boring machine such as a Hole Hog®, or other approved boring equipment. Minimum allowable encasement pipe diameter for the crossing shall be of sufficient size to allow the water or sewer service line to be easily slid into position. Casing pipe diameter and material shall be approved by the Project Manager prior to installation.

Sieve Size Percent Passing Square Opening By Weight

3/4 inch 100

0.250 inch (No. 3 sieve) 50-65

0.0029 inch (No. 200 sieve) 5 max.

1/06 Technical Provisions TP 11.0 Individual Septic Tank Page 1

TECHNICAL PROVISION 11.0

INDIVIDUAL SEPTIC TANK

11.01 Scope of Work

The work covered by this section includes the furnishing of all plant, labor, tools, equipment, and material, and performing all operations in connection with the construction of individual septic tanks, including connection to building (house) drains, solid sewer pipe, cleanouts, abandonment of existing septic tanks, fittings, effluent filters, and appurtenances in accordance with these technical provisions and applicable drawings.

11.02 Permits and Approvals

The Government shall secure the applicable site approvals and sewage disposal permits for the work specified herein.

11.03 Location of Facilities

The location of the facilities specified herein shall be as shown on the drawings and/or as staked in the field by the Project Manager. The Contractor shall not change the designated location of these facilities without the prior approval of the Project Manager.

11.04 Inspection of Installation

In addition to the applicable inspection requirements of the Tribe and/or County, the Contractor shall notify the Project Manager at least 2 working days prior to placing final backfill over the septic tank so that the Project Manager may inspect the installation.

11.05 Solid Sewer Pipe

The Contractor shall install a solid smooth pipe from the septic tank to the building (house) drain.

Solid sewer pipe and fittings shall be 4-inch PVC plastic, ASTM 3034, SDR 35 sewer service lines. Installation shall be in accordance with all state and local and/or Tribal standards.

11.06 Effluent Filter

The Contractor shall install in the outlet tee of the septic tank a 1/16th-inch effluent filter cartridge equivalent to Zabel (A1800 Series) or Polylok (PL-68). The outlet tee in the septic tank shall be of sufficient length to extend one (1) inch below the bottom of the filter cartridge (See detail drawings).

1/06 Technical Provisions TP 11.0 Individual Septic Tank Page 2

11.07 Septic Tank

11.07.01 Tank

The tank shall be precast, reinforced, watertight concrete as manufactured by an established firm specializing in concrete products conforming to ASTM 6913. Minimum liquid capacity below the outlet level shall be as specified on the drawing(s) and each tank shall have 2 compartments. The walls, floor & top shall have a minimum thickness of 2 ½-inches. Adequate steel reinforcement shall be provided. Each compartment shall be provided with adequate tees, elbows and baffles. The tank shall meet all state and local standards.

11.07.02 Access Riser

Each compartment of the septic tank shall be provided with a watertight access riser with a minimum dimension of 24-inches for inspection and sludge removal. The access riser on the second chamber shall be centered so as to provide access to the effluent filter.

Access risers shall meet all state and local standards. Additional access ports, if required by local health codes, shall be installed by the Contractor at no additional expense to the Government. Risers shall be equal to Orenco systems lids and risers.

11.07.03 Septic Tank Installation

The septic tank shall be set in a hole excavated by the Contractor in accordance with all state and local standards.

11.08 Pump Existing Septic Tank

When included on the bid schedule, the Contractor shall pump existing septic tanks by pumping the liquid and solids out of the tank. The septic tank liquid and solids shall be disposed of as required by local health codes. Backfilling pumped liquid to agitate the accumulated solids in the septic tank is not allowed.

11.09 Abandon Existing Septic Tank

When included on the bid schedule, The Contractor shall abandon existing septic tanks by pumping out the liquid out of the tank, breaking open the cover of the tank, and backfilling the empty tank with approved borrow material. Backfilling shall be carefully placed to eliminate voids, and shall be mounted to allow for settlement. The septic tank liquid shall be disposed of as required by local health codes.

11.10 Underground Cleanout

Where required and as shown on the plans, the Contractor shall install a two-way underground cleanout on the solid sewer line. The cleanout shall have a threaded plug and be constructed as detailed in the drawings. The cleanout shall be extended so that the square nut on the threaded plug

1/06 Technical Provisions TP 11.0 Individual Septic Tank Page 3 is ½-inch below finished ground level. If indicated on the plans, a concrete pad 18-inches square and 4-inches deep shall be poured around each cleanout at the ground surface. This pad shall be reinforced with welded wire mesh with a minimum 1 1/2-inch concrete cover over mesh. The wire mesh shall be ASTM approved W1.4 (1/8-inch) wire mesh on 6-inch centers.

1/06 Technical Provisions TP 12.0 Individual Lift Station Page 1

TECHNICAL PROVISION 12.0

INDIVIDUAL LIFT STATION

12.01 Scope of Work

The work covered by this section includes the furnishing of all plant, labor, tools, equipment, and materials, and performing all operations in connection with the construction of an individual lift station, including lift station basin, effluent pump, piping, force main, fittings, control panel, electrical controls and alarms, and appurtenances in accordance with these technical provisions and applicable drawings.

12.02 Lift Station

The lift station basin shall be either the second chamber of a septic tank, as shown in the drawings, or a precast, reinforced, watertight concrete basin as manufactured by an established firm specializing in concrete products, and shall conform to ASTM C1227. The basin shall have a minimum wall thickness of 2½-inches and the concrete shall obtain a minimum 28-day compressive strength of 3,000 psi.

The basin shall be as specified on the drawing(s), including the required minimum volume. The lift station basin shall be provided with a watertight access riser with a minimum diameter of 24-inches for inspection and maintenance. The access riser shall meet all state and local standards.

If indicated on the plans, an 18-inch square pedestal 4-inches high shall be provided as a base for the pump. The pedestal shall be located as shown on the drawing.

The installation of the lift station basin shall conform to the provisions of TP 11.0 for the installation of the septic tank and meet all state and local standards.

12.03 Effluent Pump

The sewage pump shall be as specified on the drawing(s), 120 volt, single phase submersible effluent pump. The pump shall be capable of passing 3/8-inch solids and running at the flow rate and total dynamic head as specified in the design. Differing site conditions may require a similar pump with minor differences in flow/head characteristics to be provided by the Project Manager.

The pump power cord shall be easily detachable from motor housing. Connector shall be sealed to motor housing with rubber O-ring. The pump details shall be as shown on the drawings or equal. If specified in the design, the effluent pump shall be installed within an Orenco Systems or equivalent effluent filter vault. If installed in the septic tank, the vault shall be installed with the inlet holes of the vault not less than 31-inches from the floor of the septic tank.

1/06 Technical Provisions TP 12.0 Individual Lift Station Page 2

12.04 Electrical Controls and Alarm

The Contractor shall furnish and install a control system compatible with the supplied pump.

The controls shall include; circuit breakers for the pump and alarm system, magnetic contactor, mercury level control floats, a high liquid level alarm, running and alarm lights, and a Hand-Off- Automatic selector switch. All wiring shall be in accordance with the National Electrical Code and applicable state and local electrical codes. The installation shall be inspected and approved by the State Electrical Inspector.

Electrical service to the lift station shall be either from a new properly sized circuit breaker in the existing circuit breaker panel servicing the home, if space permits, or through a separate subpanel. Separate circuit breakers are required for both the pump magnetic contactor and for the alarm system. In any case a fused disconnect is required if service entrance panel or sub-panel is greater than 50 feet from the lift station and/or not in clear sight of the lift station and shall be located as shown on the drawings or as directed by the Project Manager.

The control panel shall be a NEMA 4X enclosure and shall house the "Hand-Off-Automatic" switch, green "pump on" indicator light, a terminal block for connecting the mercury float level controls, and the alarm system. The green "pump on" light, red alarm light and silence button shall be mounted through the enclosure door.

The magnetic contactor, alarm system, and control panel shall be mounted on outside wall of the home at a location acceptable to the homeowner. As an alternative, and with the approval of the Project Manager, the control panel or alarm panel may be located on a post near the lift station as long as the components are housed in NEMA 4X enclosure.

The pump electrical cable shall be Type UF single conductor cable sized to limit the overall voltage drop from the service entrance to the pump motor to less than 2 percent. In no case, shall wires smaller than 12 gauge be used. The electrical cable and control wires shall be buried at least 18 inches deep. House interior wiring shall be 12 gauge minimum and shall be Type NM or UF cable, while required conduit shall be EMT, PVC, or liquid tight flexible metal. All supports, nails, bolts, straps and screws shall be galvanized. The submersible power cable from the pump and the float cables shall be secured to a hook and secured such that the cables are not allowed to slip from their adjusted height.

The mercury level control switches shall be completely encapsulated in polyurethane foam and equipped with cord weights. The float switch shall be installed at the elevations indicated or as otherwise directed by the Project Manager. The electrical cable housing from the switches to the control panel shall be Type UF 14 gauge copper single conductor cable. Splices shall be made by using mechanical connectors and covering with heat-shrink tubing.

1/06 Technical Provisions TP 12.0 Individual Lift Station Page 3

12.05 Control System Functional Requirements

12.05.01 Demand Dosing

The liquid level in the individual lift station is sensed by three mercury level control switches suspended at different elevations from the top of the lift station. The first (lowest) mercury level control switch shall be a redundant off switch and shall de-energize the pump should the middle dual action on-off float fail. The middle float shall be dual action and energizes and de-energizes the lift station pump. The third (highest) mercury level control switch energizes the red light and alarm bell indicating a high water level condition.

During the normal mode of operation, the HAND-OFF-AUTOMATIC switch shall be in the "Automatic" position. As the liquid level in the individual lift station reaches energize level of the middle dual action mercury level control switch, an electrical signal shall be transmitted through the buried electrical cable to the control panel. The controls shall energize the lift station pump and green running light. As the liquid level in the individual lift station drops to the middle de-energize level, an electrical signal shall be transmitted to the control panel which shall de-energize the lift station pump and green running light. This cycle shall continue to repeat itself. Should the middle dual action on-off float fail, the redundant lowest level float shall de-energize the pump and activate the alarm bell and red alarm light indicating a low level float failure.

If the liquid level in the individual lift station rises to the top mercury level control switch, the red light and alarm bell shall be energized indicating a high liquid level condition. The alarm shall be silenced by manually pushing the "Alarm Silence" button, however, the red pilot light shall remain energized until the liquid level has fallen below the third mercury level control switch. This high liquid level light and alarm shall operate independently of the position of the pump selector switch.

When the pump selector switch is in the "Hand" position, the mercury level float switches shall be overridden and the lift station pump and green running light shall be energized independently of the liquid level in the lift station. When the pump selector switch is in the "Off" position, there shall be no power provided to the lift station pump and green running light.

12.05.02 Timed Dosing

Timed dosing may control the liquid level in the individual lift station, if specified by the Project Manager and shown on the drawings, with three mercury level control switches.

The third (highest) mercury level control switch serves as a high water level alarm and energizes the red light and alarm bell indicating a pump failure condition. When the pump is operational and dosing overload occurs, the liquid level will reach the second (mid-level) mercury level control switch and the timer shall be overridden, energizing the lift station pump and the green pump running light on the control panel. As the liquid

1/06 Technical Provisions TP 12.0 Individual Lift Station Page 4 level drops, reaching the first (lowest) mercury level, the control switch overrides the timer and de-energizes the lift station pump and the green running light.

When the liquid level in the individual lift station does rise to the third (highest) mercury level control switch, the alarm shall be silenced by manually pushing the “Alarm Silence” button. However, the red pilot light shall remain energized until the liquid level has fallen below the second mercury level control switch. This high liquid level light and alarm shall operate independently of the position of the pump selector switch.

When the pump selector switch is in the “Hand” position, the timer and mercury level float switches shall be overridden and the lift station pump and green running light shall be energized independently of the liquid level in the lift station. When the pump selector switch is in the “Off” position, there shall be no power provided to the lift station pump and green light running.

12.06 Piping

12.06.01 Lift Station Influent

The piping from the septic tank outlet to the lift station inlet shall conform to TP 11.0, solid sewer pipe. The inlet shall include a tee or baffle, as specified. The outlet discharge from the pump shall be Schedule 40 PVC 1120 pipe installed as shown in the drawings and to the approval of the Project Manager. Fittings shall be Schedule 40, ASTM 2466, except for the union, which shall be Schedule 80. The union shall be installed within easy reach from the manhole cover, hand-tight only. The male adapter that screws into the discharge port of the pump shall not be glued in place; standard plumbers’ pipe joint compound shall be used.

12.07 Submittals

The Contractor shall submit for approval prior to construction product/material information on the sewage lift station pump and controls.

1/06 Technical Provisions TP 32.0 Individual Water Systems Page 1

TECHNICAL PROVISION 32.0

INDIVIDUAL WATER SYSTEMS

32.01 Scope

This section covers the furnishing and installation of complete and operational individual household water systems. This includes but is not limited to the submersible pump, drop pipe, fittings, electrical, pressure system, pressure system, system enclosure, water service line, trenching and backfilling.

32.02 General

The work covered by these specifications includes the installation of pressurized individual water systems at sites as indicated on the bid schedule. Pressurized system shall be located either in the home or in an exterior enclosure as shown in the drawings. Construction shall be at the locations staked by the COR or as indicated on the attached plans. It shall be the Contractor's responsibility to examine the site with the Project Manager in advance of any work being performed.

32.03 Pitless Adapter and Well Cap

Pitless Adapters shall meet the following specifications:

Material: Bronze or brass alloy with neoprene 0-ring Well Casing Height: 12 to 18-inches above finished grade Depth of Bury: 3-feet Connection to Casing: Tighten adapter to casing after hole is cut using cutting template.

Certification: PAS-1 Watertight, Pitless Adapter Division, Water System Council.

The area around the well shall be backfilled, compacted, and sloped to drain away from the well.

A watertight well cap with vent and provision for electrical conduit, Monitor 6W or equal, shall be installed. A screened well vent shall be installed on the cap, Monitor 71 PS or approved equal.

The vent shall be connected to the well cap with a 1 1/4-inch diameter Schedule 40 galvanized nipple 2 to 3-inches long.

32.04 Submersible Pump and Appurtenances

32.04.01 Submersible Pump

Electrical: 240 volt, single phase, 3 wire Performance: As specified in Bid Schedule and Attachments Pump Shaft: Stainless steel, hex or splines Shell: Stainless steel

1/06 Technical Provisions TP 32.0 Individual Water Systems Page 2

Discharge Head & Pump Motor Adapters: Stainless steel Integral Check Valve: Built-in, spring loaded Size: as specified on Bid Schedule Type: Pump and Motor shall be separate, replaceable units

Install the pump at the depth specified by the Project Manager and in accordance with state and local standards.

32.04.02 Check Valve

In-line check valves shall be installed immediately above the well pump. The check valves shall be equal to Simmons Model 1503.

32.04.03 Drop Pipe

Drop pipe shall be Schedule 120 PVC pipe and couplings, meeting ASTM D1785 and ASTM F480, of the size specified in the bid schedule. Teflon tape or Teflon joint compound shall be used on all joints. Non-Teflon joint compound is not acceptable.

32.04.04 Submersible Cable

Annealed copper with 3/64-inch moisture-resistant, rubber insulation bonded to the copper and 2/64-inch of neoprene covering for mechanical protection shall be USE RHW UL 600V solid conductor. Submersible cable shall be sized to supply adequate power to the installed submersible pump with a voltage drop of no more than 2%, and shall be installed in accordance with state and local standards.

32.04.05 Submerged Splices

Mechanical splice, STA-KON or equal, with electrical tape wrap or Goulds AW 25 splice kit or equal.

32.05 Enclosure Pressure System

N/A

32.06 In-House Pressure System

N/A

32.07 Pressure System with Variable Frequency Drive - Mechanical Components

32.07.01 General

1/06 Technical Provisions TP 32.0 Individual Water Systems Page 3

The layout and facilities to be installed are shown in the drawings. It will be the Contractor's responsibility to install all appurtenances required in an orderly arrangement in the space allotted. Any change in the placement of individual components in the enclosure from the locations shown in the drawings shall be approved in writing by the Project Manager, prior to installation.

32.07.02 Variable Frequency Drive

The variable frequency drive (VFD) shall be single-phase input, 3-wire motor control, ¾ HP performance, Aquavar SOLO2 or approved equal. The VFD shall be mounted to a standalone post with a roof overhead or the back wall of the house in a NEMA 4 enclosure, capable of withstanding temperatures of -13 °F to 125 °F (-25 °C to 50 °C) -13 °F and relative humidity of up to 100%.

32.07.03 Pressure Sensor

Shall be pressure sensor supplied or recommended by VFD manufacturer. Shall be fully sealed and suitable for wet/submerged conditions without risk of electrical hazard. Shall be NSF 61 rated, with a 1/4-18 National Pipe Thread (NPT) connection, and set to 60 psi.

Install the pressure sensor at the pressure tank tee downstream of the pressure tank. The pressure sensor should not be installed in an inverted orientation (upside down). Place pressure switch where it is easily accessible for adjustment.

32.07.04 Pressure Gauge

Shall be glycerin or silicone filled, 0-100 psi range, brass stem with ¼-inch thread, 2-inch diameter face, and steel face; Ashcroft or equal. Install vertically and place pressure gauge so that it can be easily read.

32.07.05 Hydropneumatic Tank

Precharged, set to 40 PSI. Tank shall be 2-gallon, Amtrol Well X-Trol WX-101, In-Line Diaphragm Well Tank or approved equal. The tank shall be installed in an easily accessible underground polypropylene or HDPE valve box placed over a minimum of 6 inches of ¾-inch drain rock.

32.07.06 Pressure Relief Valve

A lead-free, ¾-in pressure relief valve, Merrill or equal, shall be installed adjacent to the pressure tank and set to discharge at 100 psi.

32.07.07 Drain Valve

Bronze, 3/4-in hose thread, O-ring stem seal, built-in backflow preventer, and capped outlet. Valve shall be rated at 125 psi. NIBCO, Smith Cooper or equal.

1/06 Technical Provisions TP 32.0 Individual Water Systems Page 4

32.07.08 Pressure Tank Piping

One-inch galvanized iron pipe. Teflon tape or teflon compound required on all threaded connections.

32.08 Electrical

32.08.01 General

All wiring shall be in accordance with the National Electrical Code and applicable State and local electrical codes. Inspection and approval by the state Electrical Inspector is required. The contractor shall make all arrangements and pay all fees for permits and inspections at each installation.

Use conduit throughout the pressure system enclosure and between the disconnect, pressure switch and control box for systems at the house.

32.08.02 Service

Separate branch circuit is required. Size wires to limit overall voltage drop from the service entrance to the pump motor to 2%. In no case shall wires smaller than AWG #12 be used, including wiring to the receptacle. Service shall be installed in accordance with all state and local standards.

32.08.03 Electrical Cable

All cable and wire shall be UF or USE and shall be sized according to Section 32.08.04 and all shall be installed in specified conduit according to all state and local standards.

Enclosure Pressure System cable between the pressure system circuit breaker panel and the motor control box and to the well shall be three conductor with ground. At the well and the motor control box the conductors of the cable shall be vinyl taped to the color code of the pump circuit. The purpose of color code taping is to simplify troubleshooting.

Electrical cable between the pressure system components located inside the enclosure shall be type UF, or USE, two conductor with ground.

Buried electrical cable from each well to the pressure system shall be type USE or URD Copper. Minimum cable size shall be in compliance with NEC. Neutral cable size shall be as specified by local and state codes.

32.08.04 Electrical Conduit

Buried electrical conduit shall be 1" minimum type 40 rigid PVC electrical conduit sized in conformance with the NEC. It shall extend from the well cap to at least 2 feet into the

1/06 Technical Provisions TP 32.0 Individual Water Systems Page 5 ground and shall be installed inside and under the enclosure pressure system to 2 feet outside of base.

Electrical conduit between the pressure switch and the pressure system circuit breaker panel and between the pressure switch and the motor control box shall be U.L. listed non-metallic Carflex Liquidtight conduit or equal.

Electrical conduit for the pressure system other than that specified above shall be galvanized EMT or Type 40 rigid PVC. All supports, nails, bolts, straps, and screens shall be galvanized or otherwise corrosion resistant, as approved by the Project Manager.

All conduit shall be properly connected using manufacturer's recommendations and installed in accordance with all state and local standards.

32.08.05 Motor Control Box

All components shall be sized correctly for pump motor model selected. Box shall be mounted so that it is easily accessible for maintenance. Wires shall be connected and vinyl color taped to match the color code of the pump circuit.

32.09 Water Service Pipe

32.09.01 Material

Polyvinyl chloride (PVC) pipe, Schedule 40, shall be at the size as specified in the Bid Schedule and drawings. Pipe shall be in conformance with ASTM D1785 and AWWA C-

900. Any connections (such as a yard hydrant) and changes in direction must be accurately marked for inclusion on as-builts.

32.09.02 Fittings for Water Service Pipe

Fittings and connections for PVC pipe shall conform to ASTM D3139 with elastomeric seals (gaskets) conforming to ASTM F477, or be equal to Fernco flexible coupling.

32.09.03 Trenching

Install water pipe with a minimum cover of 24-inches. Place select backfill, free from all stones, frozen soil, and clods, over the first foot of pipe and compact by hand. Compact in one foot lifts to a point 5-feet from the well. Replace and compact remaining backfill to a density equal to that of the surrounding earth. Mound over trench line and smooth off.

Dispose of any surplus material and restore area in a manner equal to that existing prior to construction.

Keep pipe ends plugged during construction to prevent entrance of dirt or other foreign material. Connect water service line to house plumbing stub-out.

1/06 Technical Provisions TP 32.0 Individual Water Systems Page 6

32.09.04 Imported Pipe Embedment

When native material is unsuitable for use as backfill over the first foot of pipe as determined by the Project Manager, the Contractor shall import suitable material from off site. This imported pipe embedment shall be free of all stones, frozen soil and clods. All backfill shall be placed in accordance with Section 3.05.

32.10 Insulated House Connection

The polyethylene or PVC service line shall be continued directly to the house water service entrance and shall be connected there with a compression fitting on the PE side per 32.10. All services must come up from the ground within trailer skirting or foundation line as appropriate.

When the service line must be installed where it will be exposed to outside temperatures, as determined by the Project Manager, the pipe shall be heat taped and insulated from the point where it enters the house to a depth 3-feet below the ground surface. Heat tape shall be self limiting type, 3 to 5 watts per foot at 50 degrees F; Chemelex 4ATV, 4 watt per foot, (available from Unit Process Company, Kirkland, Washington (206) 827-0433) or Frostex II, Raychem Corp., Redwood City, California, or approved equal, and shall terminate with male 120 VAC plug outside of the insulation at the top end and with an end splice kit at the lower end. The homeowner will be responsible for connecting the plug to a power supply. Wrap 1 inch thick weatherproof closed cell foam insulation around pipe and heat tape. Seal all gaps in insulation with waterproof plastic tape.

32.11 Disinfection

Disinfection of the pressure system and water service line shall be performed by the Contractor after the system is complete using liquid chlorine only with a minimum concentration of 50 ppm.

Use of HTH or other granular compounds will not be allowed. The chlorine solution will remain in the pressure system and water service line for a minimum of ½ hour. The pressure system and water service line will then be flushed until chlorine residual is eliminated. Care shall be taken by the Contractor to prevent accidental water use by the homeowner. After the chlorine residual has been completely eliminated, the Contractor shall take water samples from the house for bacteriological examination by an EPA certified laboratory. Sampling methods shall be in accordance with recommendations of the laboratory. Testing shall be done at the Contractor's expense. If unsafe bacteriological results are received, the Contractor shall re-chlorinate and flush as necessary until safe bacteriological tests are obtained. Any re-chlorination and testing needed will be at the Contractor's expense.

32.12 Submittals

The Contractor shall submit for approval prior to construction product material information on the well pump, pitless adapter, well cap, variable frequency drive, hydropneumatic pressure tank, pipe, and any other individual pressure system components.

TP 32 Individual Water System