The following minimum standards must be used:
(A) A “Y” cleanout must be installed within 3 feet of the building's exterior.
(B) Minimum schedule of pipe is SRD35. Minimum pipe size is 4 inches in diameter.
(C) Minimum slope of lateral from the building to the main is 1/4 inch per foot.
(D) Backfill material must be either sand or pea gravel.
(E) At time of inspection, pipe must be bedded to ½ the diameter of the pipe. All sections and joints must be exposed. After inspection, pipe must be backfilled with the equivalent of the pipe's diameter (such as, 4-inch diameter pipe will have 4 inches of sand or pea gravel at the top, bottom, and each side).
(F) Either glue or gasketted slip joint must be the type of pipe connection.
(G) The use of 90-degree elbows is prohibited. Use of two 45-degree elbows is acceptable, but must be a minimum of 1 foot of pipe between each 45-degree elbow.
(H) Clear water discharges are prohibited into or with the lateral tie-in such as foundation/footing drains, sump pumps, roof drains/downpours, heat pump/cooling water.
(I) Joint sealant for concrete tanks must be butyl rubber and meet or exceed the requirements of ASTM C-990, Standard Specification for Joints for Concrete Pipe, Manholes, and Precast Sections Using Preformed Flexible Joint Sealants, § 6.2 Butyl Rubber Sealant, and be installed according to manufacturer's installation recommendations.
(J) Drain holes in precast concrete tanks must be plugged with hydraulic cement or a plug provided by the manufacturer before the tank is put into use.
(K) Manufacturer's recommendations for the anchoring of fiberglass and polyethylene tanks must be followed.
(L) Where the water table is above the base of the tank during installation, one or more of the following measures must be used:
(1) The tank must be filled with water;
(2) Soil material must be placed over the top of the tank; and
(3) Groundwater must be pumped from the excavation until the backfill operation is complete.
(M) Pipe installed in connectors must be restrained from movement during backfill operations.
(N) Backfill with soil material:
(1) Stones or debris must be no greater than 3 inches;
(2) Soil material must be placed in layers 12 inches to 24 inches thick. Depth of layers must be adjusted according to soil material used; and
(3) Each layer of soil material must be compacted to prevent uneven settling.
(O) The final grade must divert surface water away from the tank access opening covers.
(P) When the tank(s) is abandoned and/or removed, the following measures are to be followed:
(1) The owner/developer is responsible for abandonment/removal of all tanks;
(2) Tanks must be abandoned and/or removed when the useful life of the tank has been exceeded or when an OSS is abandoned;
(3) If the tank is abandoned:
(a) The tank must be pumped of all contents by a licensed wastewater management business;
(b) The tank cover must be collapsed into the tank or removed; and
(c) The tank must be filled with debris-free sand, or other granular or soil material that is compacted, to prevent settling.
(4) If the tank is removed:
(a) The tank must be pumped of all contents by a licensed wastewater management business;
(b) The tank must be removed; and
(c) The remaining excavation must be filled with debris-free sand, or other granular or soil material that is compacted, to prevent settling.
(Ord. 4-2003, passed 7-14-2003)