J04 Technical Specifications.pdf

INDIAN HEALTH SERVICE

WESTERN OREGON DISTRICT OFFICE

STANDARD SPECIFICATIONS

FOR

The Peggy Williams Homesite

Individual On-site Septic System

Portland Area Indian Health Service Revised 01/2021

Concrete Septic Tank and Piping 02540 - 1

SECTION 02540 – CONCRETE SEPTIC TANK AND PIPING

PART 1 - GENERAL

SUMMARY

This section covers multiple compartment rectangular precast septic tanks. Also included is the piping from the home to the septic tanks along with cleanouts and septic tank abandonment.

RELATED WORK

Section 02545 – Conventional Drainfields

REFERENCES

ASTM C1227 – Standard Specification for Precast Concrete Septic Tanks

ASTM C1644 – Standard Specification for Resilient Connectors Between Reinforced Concrete On-Site Wastewater Tanks and Pipes

ASTM D2665 – Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Drain, Waste, and Vent Pipe and Fittings

ASTM D3034 – Standard Specification for Type PSM Poly(Vinyl Chloride) (PVC) Sewer Pipe and Fittings

State of Oregon – Oregon Administrative Rules Chapters 340-71 Onsite Wastewater Treatment Systems

State of Oregon – Oregon Administrative Rules Chapters 340-71 Construction Standards

QUALITY ASSURANCE

The materials and construction methods specified herein are minimum requirements.

Where the appropriate state/local septic codes require more stringent materials or execution methods, they shall apply.

PART 2 - PRODUCTS

SEPTIC TANKS

Septic Tank Requirements

Min. reinforced concrete wall thickness 2 ½ inches Minimum capacity below outlet 1500 gallons, or as specified on the bid schedule Minimum liquid depth 2 1/2 feet Maximum liquid depth 5 1/2 feet

Concrete Septic Tank and Piping 02540 - 2

Concrete compressive strength 4000 psi

Rectangular tanks

Minimum width of 36 inches Constructed with the longest dimension parallel to the direction of flow.

Reinforce throughout with 6-inch x 6-inch – 10/10 wire mesh.

Monolithic construction joints or interlocking V-notch, shiplap, or tongue and groove joints below the liquid level.

Provide two compartment tanks.

Tank partition: 3-inch thick reinforced concrete.

Leave 1-inch clear space between top of partition and top of tank.

Place partition so volume on inlet side is 2/3 of total tank volume.

Cast 4-inch PVC, DWV coupling in partition at midline of tank.

Inlet and Outlet

Provide tanks with inlet and outlet connections for 4-inch Schedule 40 PVC

DWV.

a. Inlet connection: Cast in place rubber boot with stainless steel clamp.

b. Outlet connection: Cast in place 4-inch schedule 40 PVC DWV coupling.

Provide inlet with an open-end sanitary tee or baffle made of approved materials.

a. Extend top of tee or baffle above the liquid level, keeping a minimum of 1 inch clearance from the top of the tank.

b. Extend bottom of tee or baffle to at least 6 inches below the liquid level.

Provide outlet with open-end schedule 40 PVC DWV sanitary tee and pipe.

a. Extend top of tee above the liquid level, keeping a minimum of 1 inch clearance from the top of the tank.

b. Extend bottom of tee below the liquid level to a depth equivalent to 40% of the liquid depth.

c. Provide long sweep elbow cut as shown in the detail drawings for gas deflection.

The outlet invert shall be at least 1 inch lower than the inlet invert.

Access Risers and Covers

12-inch diameter access opening over the inlet and the outlet.

12-inch PVC SDR 35 pipe access riser attached to the septic tank with a cast in place PVC coupling.

Reinforced concrete cover, plug type, weighing a minimum of 70 pounds and include a recessed rebar handle.

Joint Sealant

Concrete Septic Tank and Piping 02540 - 3

Butyl rubber based preformed flexible gasket-type sealant conforming to ASTM C990.

Acceptable products equivalent to:

a. RU106 Rubr-Nek LTM as manufactured by Henry Company.

b. Pro-Stik as manufactured by Press-Seal Gasket Corporation.

2.01 PIPING WITHIN PUMP TANK, CHECK VALVE, AND BALL VALVE

A. Sch. 80 PVC piping and union through the riser, as shown in the detail drawings.

B. Check Valve: 2-inch heavy duty cast iron ball valve with rubber ball and cleanout port with plug.

C. Ball Valve: 2-inch heavy duty PVC ball valve.

2.02 PUMP, CONTROLS, AND ALARM

A. Effluent Pump Requirements

1. The Project Engineer shall determine the type and size of pump to be used.

2. The pump motor shall have a built-in thermal overload protection with automatic reset.

3. Use two direct acting non-mercury float switches to detect on-off control levels for the pump.

B. Power Supply Requirements: 120/240 volt, single phase, three wire service from one/two pole breaker off lighting panel in the residence on a separate/dedicated circuit.

1. Use wire sized in accordance with NEC.

C. Controls: Furnish and install controls to operate the pump based on on-off level control floats.

1. Option #1: A control panel compatible with the pump supplied and housed in a weatherproof enclosure equal to a NEMA Type 4X fiberglass enclosure.

a. Provide terminal blocks for connection of on-off level control floats.

b. A separate dead front enclosure section shall house a load switching motor contactor with door mounted heavy-duty hand-off-auto switch and a service disconnect mechanism.

c. Equal to Rhombus Inc., Model 1120W111H1E10E11C, or approved equal

2. Option #2: Pump Switch with Piggy-Back Plug and outlet rated for exterior use and housed in a weatherproof enclosure equal to a NEMA Type 4X fiberglass enclosure.

Concrete Septic Tank and Piping 02540 - 4

a. Size pump switch to be compatible with selected pump (i.e. voltage and horsepower rating)

b. Enclosure area shall be a minimum of 1.5 times the area of the piggyback switch, outlet, and folded cables to allow for easy access, removal, and replacement of switch, outlet, and cables.

c. Size power cable in accordance with the NEC.

d. Equal to Rhombus Inc, Double Float pump switch, or equivalent.

3. Provide terminal blocks for connection of on-off level control floats.

4. A separate dead front enclosure section shall house a load switching motor contactor with door mounted heavy-duty hand-off-auto switch and a service disconnect mechanism.

D. Provide an alarm system on a separate circuit from the pump.

1. Alarm system shall consist of a direct acting mechanical float switch, 24-volt control transformer, red alarm light, horn, push-to-test alarm button, and a horn silence switch.

a. Alarm light and horn shall activate when alarm float circuit is closed.

b. The horn shall continue to sound until reset manually by a button located on the alarm panel.

c. The alarm light shall continue to operate until the alarm circuit has been opened, the operating condition has returned to normal, and the silencing switch has been returned to its “normal” position.

2. Option 1: Indoor alarm system shall be Powertronics Model MD 3875, Rhombus

Model 101-01H (Tank Alert 1) or approved equal.

3. Option 2: Outdoor alarm on the control panel is Contractor’s option. Rhombus

Control panel Model #1121W111H10E or approved equal.

2.03 ELECTRICAL CABLE

A. Electrical cable: Type UF for direct burial.

B. Use minimum 12/2 wire with ground to provide power to the effluent pump.

C. Use minimum 14/2 wire to provide power to the float switches.

D. Size underground cable to limit voltage drop from power source to pump motor in accordance with pump manufacturer’s recommendations.

2.04 FORCE MAIN PIPING

Concrete Septic Tank and Piping 02540 - 5

A. Polyvinyl Chloride (PVC)

1. Pipe: AWWA C906, PE4710

2. Size: As noted on site plans

SOLID SEWER PIPE, CLEANOUT AND FITTINGS

Pipe: Schedule 40 PVC, DWV conforming to ASTM D2665.

End connection: Bell and spigot.

Fittings: Schedule 40 PVC, DWV conforming to ASTM D2665.

Solvent Cement: Conform to ASTM D2564

Cleanout

Schedule 40 PVC DWV pipe and fittings conforming to ASTM D2665.

4-inch solvent weld Schedule 40 PVC female adapter.

4-inch diameter threaded slotted white polypropylene flush plug with threaded brass insert as manufactured by Sioux Chief or approved equal.

PART 3 - EXECUTION

SOLID SEWER PIPE and CLEANOUTS

Install solid sewer pipe from the house to the septic tank.

Connect to home sewer line.

Minimum cover over solid sewer pipe is 12-inches.

Minimum slope between the house and the septic tank is 1/8-inch per foot or 6 inches, whichever is greater.

90-degree bends in the pipe between the house and the septic tank are not allowed.

Cleanouts.

Double Cleanouts: Install at the locations indicated on the plans.

Single Cleanouts:

a. Install one-way cleanouts at a spacing not to exceed 100 feet.

b. Install one-way cleanouts so that the service can be rodded or snaked in the direction of flow.

Construct as shown on the standard details.

Install a 4-inch sewer wye in the sewer service line and connect risers of the same material from the wye to the ground surface.

a. Attach a schedule 40 PVC DWV female adapter to the end of the riser.

Concrete Septic Tank and Piping 02540 - 6

b. Install cleanout so cap is flush with finished grade.

Trailer House Cleanout

Install on vertical drop under trailer and as indicated on drawings.

Solvent weld all joint connections.

Install insulation in traveled areas and areas with a bury depth less than three feet in accordance with Section 02315.

TANK INSTALLATION

Place tanks at the locations and elevations designated on the plans.

Refer to Section 02315 for excavation, backfill, and grading requirements.

Place tanks level on a solid flat level subgrade.

If over excavation is necessary to remove unsuitable subgrade soils, backfill to proposed grade with sand.

Install tanks in accordance with manufacturer’s recommendations.

Seal joint between precast concrete septic tank sections with joint sealant.

Install joint sealant according to manufacturer’s instructions.

Seal inlet and outlet with temporary plugs until connections are made to the inlet and outlet lines.

Set the top of the tank a minimum of 12-inches below finished grade. Do not exceed 24-inch cover depth unless tank is designed for deeper bury depth and Owner approves.

Install access risers and terminate so access cover is flush with finished ground surface.

Do not drive over the tank during and after construction.

Grade over tank to promote positive drainage away from top of tank.

Perform leakage test of tank if required by the Owner.

Fill tank with water and soak for 24 hours.

Refill tank and measure leakage.

Repair or replace tank if leakage exceeds one gallon in two hours.

3.01 CONCRETE PUMP CHAMBER AND PUMP

A. Install 4-inch Schedule 40 PVC from the septic tank to the pump chamber if installing separate septic tank and effluent pump tank.

Concrete Septic Tank and Piping 02540 - 7

B. Seal all joints between inlet piping, vent pipe, riser, etc. to eliminate ground water infiltration, as approved by the Project Engineer.

C. Install vent on pump chamber in accordance with applicable state codes.

D. Install all buried electrical cable (1 pump wire and 3 float switch wires) in one trench.

E. Floats:

1. Mount floats in pump chamber as directed by Project Engineer.

F. Pump: Install in accordance with manufacturer’s recommendation and as shown in the drawings.

1. Wire pump to new breaker in main breaker box.

3.02 CONTROL PANEL AND ALARM SYSTEM

A. Install all wiring in accordance with the NEC.

B. Mount control panel in a location specified by the Project Engineer.

C. Install the alarm system in a location to be selected by the Project Engineer and homeowner.

1. Install the alarm system on a separate circuit from the pump.

2. Set up the alarm so that upon the occurrence of an alarm condition, the high alarm sensor will close its circuit, thus energizing the red alarm light and sounding the horn.

3. Provide a switch that when moved from the “normal” to “silence” position will silence the audible alarm, and allow the red alarm light to remain energized.

4. The high alarm sensor shall continue to show an alarm condition until the operating condition has returned to normal and the silencing switch has been returned to its “normal” position.

3.03 FORCE MAIN

A. Pump Chamber Piping

1. Install Sch 80 PVC piping and union through the riser, as shown in the detail drawings, so as to allow the removal of the pump through the riser by only disconnecting the union.

2. Place union within 24 inches of the top of the tank riser.

3. Install ball check valve between union and pump.

Concrete Septic Tank and Piping 02540 - 8

4. Install ball valve between union and outlet of pump tank.

5. Transition to PE piping outside of pump tank.

B. Alternative discharge piping layout: exit through the pump tank opening.

1. Discharge piping shall be brought up into the riser so that the union is within 24 inches of the top of the tank riser.

C. Refer to Section 02315 for excavation and backfilling procedures.

D. Bury the force main a minimum of 5 feet and insulate any portions of force main at less than 5 feet bury depth. Refer to Section 02315 for insulation requirements.

3.04 RECORD DRAWINGS

A. Provide record drawings for all buried facilities.

B. Provide two distance measurements from permanent objects to all critical items including:

1. Pipe bends.

2. Cleanouts.

EXISTING SEPTIC TANK ABANDONMENT

Abandon existing septic tanks and/or wet wells where directed by the Owner.

Pump tanks prior to abandonment. Dispose the contents in accordance with state and federal requirements.

Remove any pipes, plumbing, risers, or pumps and legally dispose of off-site.

Puncture the bottom of the tank.

Crush the top of the tank and place in abandoned septic tank.

Backfill interior of the tank with suitable soil material.

Mark location abandoned septic tanks on the as-built drawing.

END OF SECTION

Indian Health Service Revised 01/2021

Drainfields and Gravelless Chambers 02545 - 1

SECTION 02545 – CONVENTIONAL DRAINFIELDS

PART 1 - GENERAL

1.1 SUMMARY

A. This section includes construction of rock and gravelless drainfield chamber systems.

1.2 RELATED WORK

A. Section 02540 – Concrete Septic Tank and Piping

1.3 REFERENCES

A. ASTM D2665 – Standard Specification for Poly Vinyl Chloride (PVC) Plastic Drain, Waste, and Vent Pipe and Fittings

B. ASTM D3034 – Standard Specification for Type PSM Poly Vinyl Chloride (PVC) Sewer Pipe and Fittings

C. ASTM D2241 – Standard Specification for Poly(Vinyl Chloride) (PVC) Pressure- Rated Pipe (SDR Series)

D. Uniform Plumbing Code

1.4 QUALITY ASSURANCE

A. Excavation or construction of drainfields will not be allowed when the moisture content of the soil is greater than the plastic limit or when the occurrence of rain, snow or frost is such that the quality of construction may be impaired.

B. The materials and construction methods specified herein are minimum requirements.

Where the appropriate state/local septic codes require more stringent materials or execution methods, they shall apply.

PART 2 - PRODUCTS

2.1 SOLID SEWER PIPE AND FITTINGS

A. Conform to ASTM D2665.

B. 4-inch Schedule 40 PVC, DWV pipe.

C. Solvent weld fittings.

2.2 FORCEMAIN

A. SDR 21 PVC, ASTM D2241, Solvent Weld

B. Schedule 40 PVC, Solvent Weld

Drainfields and Gravelless Chambers 02545 - 2

2.3 DISTRIBUTION BOX

A. Single inlet and three (3) or more outlets.

B. High Density Polyethylene.

1. Equal to American Distribution Box by American Mfg. Co. or Distribution Box by Tuf-tite.

2. Flow equalizers equal to Dial-A-Flow by American Mfg. Co. or Speed Leveler by Tuf-Tite.

C. Precast Concrete.

1. Supplied with American Dial-A-Flow equalizers as supplied by American Mfg. Co.

D. Distribution Box Riser

1. Minimum 24-inch diameter corrugated HDPE pipe, dual wall.

2. Interlocking access riser with removable cover equal to Polylok Model 3008-HD.

2.4 DROP BOX

A. Constructed of High Density Polyethylene.

1. Equal to Tuf-Tite or American drop boxes.

2.5 FLOW DIVIDER

A. Non corrosive ridged vinyl PVC material

B. 1% tolerance for flow distribution

C. Equal to Zabel Environmental Technologies model Z200.

2.6 PERFORATED PIPE

A. 4-inch PVC conforming to ASTM D3034.

B. Minimum sidewall thickness of 0.120-inches.

2.7 GEOTEXTILE

A. Non-woven polypropylene geotextile

B. Minimum 3 ounce per square yard

C. Equal to Mirafi 135N or Synthetic Industries 401.

2.8 CLEAN GRAVEL OR CRUSHED ROCK

A. Washed gravel.

Drainfields and Gravelless Chambers 02545 - 3

B. Size from ¾ to 1 ½ inches, with not more than 10 percent fines below the ¾-inch size.

C. Crushed rock may be approved on an individual basis, provided an acceptance sample is submitted for analysis.

2.9 DIVERTER VALVE

A. Equal to Bull Run Valve model BRV Kit as supplied by Brainard Pipe Supply.

B. Supply metal shut off key of sufficient length to operate valve.

2.10 INSPECTION PORTS

A. Construct from 4-inch Schedule 40 PVC pipe and fittings conforming to ASTM D2665.

B. Solvent weld all connections

C. Supply 4-inch slip on cap or threaded female adapter with 4-inch diameter threaded slotted white flush plug with threaded brass insert as manufactured by Sioux Chief or approved equal.

2.11 POLYSTYRENE INSULATION

A. R-value of 4.5 per inch.

B. Equal to Dow Chemical Styrofoam.

2.12 REBAR

A. No.4 diameter, minimum 1-foot in length.

PART 3 - EXECUTION

3.1 SOLID SEWER PIPE

A. Install pipe from the outlet stub at the septic tank by rubber gasket joint.

B. Minimum slope for 4-inch sewer pipe is 1%.

C. A minimum of 6-inches of drop is required from the invert of the outlet pipe at the septic tank to the beginning of the drainfield.

D. Maintain a minimum of 3-feet of cover whenever possible.

E. Install polystyrene insulation in areas with less than 3 feet of cover or as instructed by the Owner.

F. Approved PVC adapters are required to connect PVC DWV pipe to PVC sewer pipe.

Fernco connections are not acceptable.

Drainfields and Gravelless Chambers 02545 - 4

G. Solvent weld all joint connections.

3.2 DISTRIBUTION BOX

A. Install at location shown on the plans, in accordance to manufacturer’s recommendations.

B. Install distribution box level.

C. Set outlet pipes level and at equal elevation.

D. Set outlet pipes lower than the inlet pipe elevation.

E. Adjust flow equalizers to allow for even distribution to all outlet connections.

3.3 DIVERTER VALVE

A. Install at location shown on the plans, in accordance to manufacturer’s recommendations

B. Extend PVC riser flush to final finished grade.

C. Provide with PVC female adapter and slotted flush plug.

D. Provide homeowner with the metal valve key.

3.4 FLOW DIVIDER

A. Install at location shown on the plans, in accordance to manufacturer’s recommendations.

B. Install flow divider level.

3.5 ROCK DRAINFIELD CONSTRUCTION

A. Excavate to the length and direction specified by the drawings and as instructed by the Owner.

B. Maintain level trench a minimum width of 24-inches.

C. Rake all smeared or compacted surfaces of sidewalls to a depth of 1-inch.

D. Remove loose material and install 6-inches of clean gravel.

E. Install 4-inch perforated pipe level and place gravel a minimum of 2-inches above the pipe.

F. Install gravel the full width of the trench or bed and lay perforated pipe level as shown on detail drawings.

1. Cover the entire top of the gravel with geotextile prior to backfilling.

Drainfields and Gravelless Chambers 02545 - 5

G. Backfill trench with the excavated material and provide adequate drainage away from drainfield area.

1. Hand tamp soil backfill.

2. Match existing drainage pattern for the site to prevent ponding on any part of the drainfield.

H. Accomplish final landscaping by harrowing, dragging, and raking to ensure uniform slope across the disturbed area.

I. Install rebar at four farthest corners of drainfield to delineate the drainfield area to act as a permanent metal detectable marker.

1. Install vertically, 1-foot away from the centerline of the piping and the centerline of the chamber.

2. Bury rebar 6-inches below the surface.

J. Backfilling:

1. Hand place excavated material along the sides of the chambers for the entire length.

2. Backfill to be dry or damp and free of large clods or stones over ¾-inch.

3. Thoroughly compact backfill by walking on the material as recommended by chamber manufacturer.

4. Place backfill evenly in no greater than 4-inch lifts.

5. Covers chambers with a minimum of 1-foot and maximum of 3-feet of fill.

6. Provide adequate drainage away from drainfield area.

7. Match existing drainage pattern to prevent water from ponding anywhere on the drainfield area.

K. Accomplish final landscaping by harrowing, dragging, and raking to insure uniform slope across the disturbed area.

L. Install rebar at four farthest corners of drainfield to delineate the drainfield area to act as a permanent metal detectable marker.

1. Install vertically, 1 foot away from the centerline of the piping and the centerline of the chamber.

2. Bury rebar 6 inches below the surface.

3.6 INSPECTION PORTS

A. Install a 4-inch Schedule 40 PVC pipe inspection port on each drainfield lateral end.

1. Insert pipe into the 4-inch cut-out hole on the top of the end of the chamber, rest on the inspection port seat, and secure in place with a stainless steel screw.

2. Install 4-inch Schedule 40 PVC inspection port to the bottom of gravel drainfields with a solvent weld toilet flange as shown on detail drawings.

B. Extend PVC inspection port to 18” above final finished grade.

Drainfields and Gravelless Chambers 02545 - 6

C. Provide with slip on Schedule 40 PVC cap.

1. If requested by the homeowner or Owner, cut inspection ports off flush with finished grade and install a 4-inch Schedule 40 female adapter and plug.

D. Hand compact soil around inspection ports to a density equal to the surrounding soil.

3.7 AS-BUILTS

A. Provide as-built information on each system in accordance with County requirements.

B. Maintain information including but not limited to:

1. Home owner name & location.

2. Septic tank, access openings, cleanout, diverter valve, distribution box, and diverter valve location.

3. Material and size of all facilities including drainfield.

4. Any other pertinent project related information.

C. Final approval and payment will not be made until an accepted as-built is supplied.

END OF SECTION

D. Hand compact soil around inspection ports to a density equal to the surrounding soil.

C. Final approval and payment will not be made until an accepted as-built is supplied.