SOW for ATU and Sewer Line Replacement.pdf

Retrofit Aerobic Treatment Unit into Existing Sewer System and Abandon Failing Septic Tank Page 1 of 3

. April 2025

STATEMENT OF WORK

1.01 SUMMARY OF WORK TO BE DONE BY CONTRACTOR

A. Furnish and install an aerobic treatment unit and sewer line as shown on the drawings.

1. Install of an Aerobic Treatment Unit (ATU), including making all electrical connections.

a. 1,250-gallon, concrete tank,

b. 24” access risers and lids, and effluent filter

c. Aerator.

d. Linear septic air pump.

e. Outdoor aerobic alarm and control panel.

f. Vented air pump housing.

2. Replace approximately 30’ of existing sewer pipe with a 2-way cleanout within 5’ of the foundation of the house.

3. Abandon existing septic tank.

1.02 SITE LOCATION

Wesley Keller 1730 Diamond Springs Road Highland, Kansas 66035

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 will 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 will be re-exposed at the Contractor’s expense.

1. Jim Shane, Engineering Technician, 785-224-7626 Donald.shane@ihs.gov

1.04 QUALITY ASSURANCE

A. Perform work under the direction of personnel licensed in the state including, but not limited to Plumbing.

1.05 WARRANTY

A. Provide a minimum one-year warranty for all materials and labor, covering defects in the materials or workmanship.

1.06 MATERIALS

A. 4” Schedule 40 PVC pipe.

B. 2-way cleanout.

C. 1,250 gallon, 2-compartment ATU tank with 24-inch access risers and lids

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D. Effluent filter rated for 800 gpd flow rate, maximum filter opening of 1/16 inch.

Provide lifting handle that extends with in 12” from the bottom of access lid.

E. Aerator

1. 1/4hp, 115VAC, 60Hz, 3.5Amps

F. Linear septic air pump

1. Capable of a flow rate of 600 gallons per day.

2. 4-5 CFM.

3. 120VAC, 60Hz, 1.6 amps.

4. 36 dBA at 1 meter distance.

G. Outdoor aerobic alarm and control panel.

1. 120VAC, 6amp push button mini breaker.

2. 1/8” barbed fitting.

3. 4” x 4” exterior alarm.

4. Run/test/mute toggle switch.

H. Vented air pump housing.

1. Inside dimensions of 18” L x 11.5” W x 12” H

2. Platform dimensions of 22” L x 17.5” W x 13” H.

1.07 INSTALLATION

A. Install sewer pipe

1. Minimum slope for sewer service lines is 1/8-inch per foot (1%) and maximum slope ½-inch per foot (4%).

2. Ninety-degree bends are not allowed between the house and the tank.

B. One-way Cleanouts: Install one-way cleanouts at a spacing not to exceed 100 feet.

C. Two-way Cleanouts: Install two-way cleanouts at a spacing not to exceed 200 feet.

1. Install risers, and cleanouts as show on the drawings.

2. Install a 2-way cleanout no more than 5ft from foundation of home.

3. Install riser pipe 90 degrees from horizontal.

4. Bed the bottom of riser, wye, and 45o bend in crushed rock or sand.

D. Remove rock from trench providing 4” of clearance for pipe.

E. In rock bottom and side trenches, provide imported bedding for 4” clearance.

F. Install 1,250-gallon, two compartment, aerobic treatment tank as shown on the drawings

1. Bed tank with 4” of 1 ½ inch gravel.

2. Install 24” tank access risers with lids over each compartment.

3. Install effluent filter in the outlet sanitary Tee of tank.

4. Incorporate aeration components to tank. Including electrical supply for aeration system.

G. Existing septic tank abandonment.

1. Pump tank prior to abandonment. Dispose of contents in accordance with state and federal requirements.

2. Break bottom and or sides so that water cannot be contained.

3. Crush lid inside of tank avoiding large voids.

4. Backfill interior of the tank with suitable, compactible soil material.

H. Finish grade excavated area.

I. Fertilize, seed and mulch all disturbed areas from installation and abandonment activities.

1.08 TESTING

A. Verify that ATU operates.

1. Add water to tank to verify that the ATU operates correctly.

Retrofit Aerobic Treatment Unit into Existing Sewer System and Abandon Failing Septic Tank Page 3 of 3

2. Test alarm on control panel.

B. Visually inspect each joint for leakage.

C. Repair all leaks before backfilling.

1.09 SITE RESTORATION

A. Restore site as close to original condition.

Creator’s Signature: ___________________