R317-4-8. Final Inspections

8.1. Final Inspections.

The regulatory authority shall inspect the entire installation before backfilling to determine compliance with this rule. Some components or system types require additional testing or inspection methods as outlined in the following.

A. Tank Water Tightness Testing.

Each tank shall be tested for water tightness prior to backfill.

1. The tanks shall be filled 24 hours before the inspection to allow stabilization of the water level. Considering water absorption by the concrete, there may not be a change in the water level nor any water moving visibly into or out of the tank. Testing shall be supervised by the regulatory authority. Tanks exhibiting obvious defects or leaks may not be approved unless such deficiencies are repaired to the satisfaction of the regulatory authority.

a. The regulatory authority may allow two piece tanks, with the joint below the water level, to be backfilled up to 3 inches below the joint to provide adequate support to the seam of the tank.

b. Polyethylene or fiber glass tanks may be backfilled as per manufacturers' recommendations.

2. If ground water elevations inhibit the ability to visibly inspect the exterior of the tank, the tanks may be tested by their ability to exclude water.

B. Distribution and Drop Boxes.

1. Distribution and drop boxes should be installed level and the flow distribution lines shall be checked by filling the boxes with water up to the outlets.

C. Pressure Distribution, Effluent Pumps.

1. Verify the correct operation of the pump, controls, and alarm.

D. Deep Wall Trenches, Seepage Pits.

1. Verify the depth of the trench excavation.

E. At Grade and Mound Systems.

1. Verify the preparation of the original ground before the placement of fill.

2. Verify that the final cover meets requirements.

E. Alternative and Experimental Systems.

1. All additional inspections will be dictated by the complexity of the system and absorption system type as identified by the regulatory authority.

G. Final Approval.

Final approval shall be issued by the regulatory authority prior to operation of the system, and shall include an as-built drawing of the completed system.