// CODE SNIPPET
H701.0 Seepage Pits
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Multiple seepage pit installations shall be served through an approved distribution box or be connected in series using a watertight connection laid on undistributed or compacted soil. The outlet from the pit shall have an approved vented leg fitting extending not less than 12 inches (305 mm) below the inlet fitting.
A seepage pit shall be circular in shape and shall have an excavated diameter of not less than 4 feet (1219 mm). Each such pit shall be lined with approved-type whole new hard-burned clay brick, concrete brick, concrete circular-type cesspool blocks, or other approved materials. Approval shall be obtained before construction for any pit having an excavated diameter greater than 6 feet (1829 mm).
The lining in a seepage pit shall be laid on a firm foundation. Lining materials shall be placed tight together and laid with joints staggered. Except in the case of approved-type precast concrete circular sections, no brick or block shall be greater in height than its width and shall be laid flat to form not less than a 4 inch (102 mm) wall. Brick or block greater than 12 inches (305 mm) in length shall have chamfered matching ends and be scored to provide for seep age. Excavation voids behind the brick, block, or concrete liner shall have not less than 6 inches (152 mm) of clean 1/4 of an inch (19.1 mm) gravel or rock.
Brick or block used in seepage pit construction shall have a compressive strength of not less than 2500 pounds per square inch (lb/in2) (1757672 kg/m2).
A seepage pit shall have a minimum sidewall (not including the arch) of 10 feet (3048 mm) below the inlet.
The arch or dome of a seepage pit shall be permitted to be constructed in one of three ways:
- Approved -type hard -burned clay brick or solid concrete brick or block laid in cement mortar.
- Approved brick or block laid dry. In both of the above methods, an approved cement mortar covering of not less than 2 inches (51 mm) in thickness shall be applied, said covering to extend not less than 6 inches (152 mm) beyond the sidewalls of the pit.
- Approved-type one or two-piece reinforced concrete slabs of not less than 2500 lb/in2 (1757672 kg/m2) minimum compressive strength, not less than 5 inches (127 mm) thick, and designed to support an earth load of not less than 400 pounds per square foot (lb/ft2) (1953 kg/m2). Each such cover shall be provided with a 9 inch (229 mm) minimum inspection hole with plug or cover and shall be coated on the underside with an approved bituminous or other nonpermeable protective compound.
The top of the arch or cover shall be not less than 18 inches (457 mm) but not exceed 4 feet (1219 mm) below the surface of the ground.
An approved vented inlet fitting shall be provided in the seepage pit so arranged as to prevent the inflow from damaging the sidewall.