Statement of Work IHS1528536.pdf

Department of Health and Human Services Indian Health Service

Wastewater System

Statement of Work Construction of a New On-Site Wastewater System for SR# 589 R Keller

1.01 PURPOSE OF THE PROJECT

A. The Oklahoma City Area Office (OCA), Indian Health Services has a requirement for furnishing and installing a wastewater system as shown on the drawings.

1.02 SITE LOCATION

A. 3376 Thrasher Road.

White Cloud, Brown County, Kansas 66094

1.03 CONSTRUCTION SCHEDULE

A. Contact the Engineering Technician three business days before the start of any work.

B. Failure to perform work on the date scheduled shall require rescheduling the work 24-hours in advance.

C. Leave all work exposed until it is inspected and approved. Work not inspected before it is covered shall be re-exposed at the Contractor’s expense.

1.04 GOVERNMENT CONTACT INFORMATION

A. Contracting Office’s Representative

1. Ted Schlueter, Senior Field Engineer, Indian Health Service Holton OEH&E 324 New York Ave, Holton, KS 66436 Office Phone: 7855.364.4164 Ted.schlueter@ihs.gov

B. Construction Inspector

1. Jim Shane, Engineering Technician Indian Health Service Holton OEH&E 324 New York Ave.

Holton, KS 66436 Office Phone: 785.364.4164 Cell Phone: 785.224.7626 Email: Donald.shane@ihs.gov

1.05 QUALITY ASSURANCE

A. Perform work under the direction of personnel licensed in the state including plumbing.

mailto:Ted.schlueter@ihs.gov

1.06 PERIOD OF PERFORMANCE / WARRANTY

A. 2 months from date of contract award to complete the work.

B. Provide a minimum one-year (12 months) warranty for all materials and labor, covering defects in the materials or workmanship.

1.07 MATERIALS AND DELIVERABLES

A. Pipe, fittings and cleanouts:

1. Polyvinyl Chloride (PVC) pipe, fittings and cleanouts shall be PVC schedule 40 as specified in the bid schedule.

2. Solvent weld, bell ended joints, pipe and fittings, conforming to ASTM D 3212

3. Four (4) inch nominal diameter and longest pipe length available.

B. Septic tank:

1. 1,000-gallon septic tank.

2. Access holes in tank lid shall be cast-in-place with a minimum diameter of 20 inches.

3. Inlet and outlet sanitary Tees, 4-inch schedule SDR35 PVC.

C. Effluent Filter and Assembly:

1. Filter rated for 800gpd flow rate.

2. 68 linear feet of 1/16 inch filter area.

3. Gasket seal to prevent effluent bypass.

4. NSF/ANSI certified and approved.

5. Baffle to fit 4-inch Schedule 40 pipe.

6. ¾ inch PVC lifting handle for filter that extends to within 2 inches of bottom of access lid.

7. Polylok, PL-68 Effluent filter or approved equal.

D. Adapter ring, access risers and covers.

1. Concrete tank adapter ring shall be of solid design and prevent movement of soil around the riser. Arc3009 Polylok, 24 inch, or approved equal.

2. Riser shall be a solid, double-walled polyethylene pipe. 24-inch N-12 by ADS

Pipe, or approved equal.

3. Cover shall completely cover riser so to prevent gases from leaking out and be of solid construction. Covers to be Polylok 3008-West, 24-inch HDPE flat septic tank cover or approved equal.

4. Joint sealant applied between the riser and adapter and the adapter and tank.

Sealant to be a bitumous plastic joint sealant. Ram-Nek RN 103, or approved equal.

E. Rock and pipe absorption system for the minimum requirement for an absorption area of 1125sqft.

Wastewater System

1. Solvent weld, bell end 4-inch nominal inside diameter, PVC sewer pipe and fittings conforming to ASTM D2729.

2. Synthetic cover for trenches,

a. TYPAR geotextile Style 3151 or approved equal.

3. Gravel.

a. Gravel shall be clean and vary in size from ½ - 2-1/2 inches with no more than

10% by weight passing through a ½ inch screen.

F. Chambers: Q4 Plus Standard Chamber or approved equal for the minimum requirement for an absorption area of 1125sqft.

1. Construct chamber sections of high – density Poly-Tuff Polyethylene.

2. Meet the minimum requirement of AASHTO-H-10 for wheel load protection.

3. Standard chamber sections shall be a minimum 34 inches in width, 53 inches in length and

12 inches in height.

4. End Caps of chamber sections shall be of the same material as the chamber.

5. Open End Caps: Provide an opening to accommodate 4-inch PVC Schedule 40 pipe.

6. Closed End Caps shall have no opening.

7. End caps shall have opening to accommodate for 4-inch PVC Schedule 40 pipe for inspections ports.

G. Distribution / Drop Boxes:

1. Construct distribution/drop boxes and lids of concrete or injection molded HDPE.

2. Honeycombed and or cracked concrete boxes and lids are not allowed.

3. Inlet invert shall be 2 inches (minimum) higher than outlet inverts.

4. A 45o or 90o elbow shall be installed to direct water flow way from outlet port.

5. Box inlet shall accommodate for a 4” PVC Schedule 40 pipe and the outlet shall accommodate for 4” PVC Schedule 40 pipe.

H. Turf and Grasses (Fertilizer, Seed and Mulch):

1. Fertilizer: 20-10-10 mixture of 20% nitrogen, 10% Phosphorous, and 10% Pot Ash.

2. Seed Mixture: Blend of Kentucky 31, Fescue, and annual rye grass.

3. Mulch: Prairie (native) hay, not more than 2 years old and free of noxious weeds.

1.08 LEVEL OF EFFORT

A. General.

1. Construct the sewer system in accordance with the IHS Project Oversight’s drawings/design and authorization permits.

2. Variations from the drawing/design or authorization permit are not permitted.

3. All work required to bring the sewer system into compliance with the drawing/design and authorization permit shall be at the Contractor’s expense.

B. Tank Installation:

1. Place tank in excavations at locations on the drawings or by Engineering

Technician.

Wastewater System

2. Excavation for tanks shall be 24 inches larger than the dimensions of the tank and 4 inches deeper to compensate for 4 inches of bedding.

3. Remove any water from excavation and check grade before setting tank.

4. Place 4 inches of crushed rock or sand for bedding of septic tank.

5. Place tank level.

6. Install inlet sanitary Tees in septic tank.

a. Extend inlet Tee to a depth of 6 inches below liquid level.

b. The bottom of the outlet opening shall be at least 3 inches lower than the bottom of the inlet opening.

7. Install effluent filter assembly in place of outlet sanitary Tee.

8. 3/4inch PVC lifting handle to extent to within 2-inches below bottom of access lid.

9. Fill tank with potable water before backfilling.

10. Connect riser adapter ring to top of septic tank with corrosion resistant fasteners and seal to tank with RN 103 Ram-Nek joint sealant.

11. Connect riser to adapter ring with stainless steel screws and seal with RN 103

Ram-Nek joint sealant.

a. Rise and cover shall terminate at approximately 2 inches above finish grade.

C. Sewer Lines Installation; 4” PVC Schedule 40 pipe:

1. Furnish and install sewer lines at locations on the drawings.

2. Connection to existing sewers: 3” or 4” PVC pipe at locations on the drawing.

3. No pipe joints shall be made within 2 feet of inlet or outlet of septic tank or edge of tank excavation.

4. Minimum slope for sewer lines is 1/8 inch per foot (1%).

5. Ninety-degree bends not allowed between home and septic tank.

D. Sewer Line Cleanout Installation:

1. Install cleanout risers at an angle equal to or less than 90 degrees measured from horizontal.

2. Bed the bottom of cleanouts with crushed rock or sand.

3. Two-Way Clean outs:

a. Install two-way clean outs at a spacing not to exceed 200 feet.

b. Install two-way clean outs so that the service can be rodded or snaked in either direction.

4. One-Way Clean outs:

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

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

E. Drop / Distribution Box

1. Box shall be place on undisturbed soil or be bedded with a 4” layer of gravel or sand.

2. Box shall be placed level.

3. Top of box shall be at finish grade level.

F. Chambered Drain Field Installation:

1. Install chambers in locations and elevations as indicated on drawings.

2. Maximum trench depth: 32 inches.

3. Trench width shall be a minimum of 36 inches for standard chamber.

4. Maximum trench length: 100 feet of chamber sections in any given path.

5. Minimum distance between trenches: 9 feet center to center of trenches.

6. Minimum depth of back fill above chamber sections: 8 inches.

7. Install inspection port risers and caps at each end of chambered trench.

8. Mound trench backfill material 6 inches above the natural ground to allow for settlement.

9. Rake all smeared or compacted surfaces of sidewalls and trench bottoms to a depth of 1 inch.

10. Before chamber section placed, remove loose material from trenches.

11. Leave each premise in a neat and orderly condition, restoring it as near as possible to its original condition and to the approval of the Engineering Technician.

12. Trenches left open and exposed to rainfall (>1/4 inches), are subject to rejection by the Engineering Technician.

1.09 Gravel (Rock and Pipe) absorption dispersal field

A. General

1. Construct the gravel absorption dispersal field in accordance with the IHS Project

Oversight’s drawings/design or authorization/permit.

B. Solid Sewer Pipe

1. Install 4-inch schedule 40 PVC solid sewer pipe from septic tank outlet to the dispersal field header pipe or distribution box or retention structure.

2. Minimum cover over the 4-inch solid pipe is 10-inches.

3. Minimum distance from septic tank to the dispersal field header pipe or distribution box is 5 feet.

4. Solid sewer PVC pipe from septic tank to the dispersal field header pipe or distribution box shall have a minimum drop of 2 inches or a minimum slope of 1/8 inch per foot of 4-inch pipe, whichever is greater.

5. Solvent weld all joint connections.

C. Gravel absorption dispersal field.

1. Trench depth: minimum 18-inches, maximum 32 inches.

2. Trench width: 36 inches.

3. Trench length: maximum 100 feet.

4. Distance between trenches: 9 feet.

5. Gravel depth below perforated pipe: minimum 6 inches

6. Lay perforated pipe level.

7. Gravel depth above perforated pipe: minimum 2 inches.

8. Place geotextile fabric on top of gravel and below backfill.

9. Backfill depth above geotextile fabric: Minimum of 6 inches and maximum 12”.

10. Backfill the trench to a depth of 3 – 6 inches above existing grade to provide for settling.

D. Turf and Grasses (Fertilizer, Seed and Mulch):

1. Fertilizing:

Wastewater System

a. Apply using mechanical equipment.

b. Uniformly distribute.

c. Incorporate into soil using harrow or other suitable equipment.

d. Conform to recommendations of local county extension agent.

e. Fertilize the area at an application rate of 200 pounds per acre.

2. Seeding:

a. Sow seed using either equipment suited to that purpose or scatter seed uniformly over area with hand seeders when the weather is sufficiently quiet to prevent seeds from blowing away.

b. Plant when soil temperature is 60° F or greater.

c. Application rate

1) 200 pounds per acre of the Kentucky 31, fescue, and rye grass.

d. Lightly rake soil to cover the seed with approximately ¼ inch of soil.

3. Mulching:

a. Place hay mulching on seeded area loose enough to allow some sunlight to penetrate and air to circulate but thick enough to shade the ground, conserve soil moisture, and prevent/reduce erosion.

b. Do not perform mulching activities during periods of excessively high winds, which would preclude the proper placing of the mulch.

c. Apply straw or hay uniformly over the disturbed area to a loose depth of ½ to 1½ inches using 2 to 2 ½ tons of mulch per acre.

d. Immediately after spreading, anchor mulch using a mulch tiller consisting of a series of dull flat discs with notched edges or other approved equipment.

E. Watering

1. Follow seed supplier’s recommendations.

F. Existing septic tank abandonment

1. Thoroughly clean tank and dispose of wastewater.

2. Break bottom and walls of tank so that no water can be contained

3. Crush lid inside of tank.

4. Backfill with excess soil from newly installed septic tank.

5. Compact soil to minimize any settlement.

6. Mound backfill above existing grade to provide for settling.

1.10 TESTING

A. Visually inspect each pipe joint for leakage.

B. Repair all leaks before backfilling.

1.11 SITE RESTORATION

A. Restore site to as close to the original condition.

B. Provide Record Drawings to the Project Engineer.

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