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06/15/99 TUE 16:47 PAX 770 435 5997 FACILITY ENGRS Q1013 PRIVATE SEWAGE DISPOSAL SYSTEMS 16 pipe, or other approved materials, provided that sufficient opening, are available for distribution of the effluent into the trench area. (b) Before placing filter material or drain fines in a prepared excavation, all smeared or compacted surfaces stall be removed from trenches by raking to a depth of one (1) inch (25,4 mm) and the loose material removed. Glean stone, gravel, slag, or similar filter :material acceptable to the Administrative Authority, varying in size from three fourths (3/4) inch to two and one-half (2-1/2) inct as (19.1 mm to 63.5 mrn) shall be placed in the trench to the depth and grade required by this section. Drain pipe shall be placed on filter material in an approved ~. manner. The drain lines shall then be covered witfi filter material to the minimum depth required by this section and this owered with untreated building paper, straw, or similar porous material -.o prevent closure of voids with earth backfill. No earth backfill shall beR laced over the filter material cover until after inspection and acceptance. (c) A grade hoard staked in the trench to the depth of filter matarial shall.be utilized when distribution line is constructed with drain tile or a flexible pipe material which will not maintain alignment witt:oaut continuous support. (d) When seepage pits are used in combinatior with disposal fiE-Ids, the filter material in the trenches shalt terminate at least five (5) feet (1.5 m) from the pit excavation and the line extending from such paints to the seepage pit shall be approved pipe with watertight jc ints. (e) Where #IMO (2) or more drain lines are installed, an approved distribution box of sufficient size to receive lateral tries shall be installed at the head of each disposal field. The inverts of all outlets shall be level and the invert of the inlet shall be at least one (1) inch (25.4 mm) above the outlets. Distribution boxes shall be designed to 'iL sure-mow ,and shall be installed on a level concrete slab in natural[r compacted soil. Distribution boxes shall be coated on the insi ie with a bituminous coating or other approved method acceptable to the Ad Ttinistrative Authority. (f) All laterals from a distribution box to the dl:tposal field shall be approved pipe with watertight joints. Multiple disposal field laterals, wherever racticable, shalt be of uniform den (g) Connections between a septic tank and a distribution'box shall be laid with approved pipe with watertight joints or natural ground or compacted fill. (h) When the quantity of sewage exceeds the amount that-can be € disposed in five hundred (500) lineal feet (152.4 m) of leach line, a it W& dosing tank shall be used. Dosing tanks shall bor equipped with an automatic siphon or pump which discharges the tank once every three ,�-p,1•?}r... (3) or four (4) hours. The tank shall have a capacity equal to sixty (60) to seventy-five (75) percent of the interior capacity of Oe pipe to be do.ed at one time. Where the total length of pipe exceeds tine thousand (100 0) i 291 I a