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• (.1 'I'hkI ii►v.'I I „1 tlie i1►let 1)il}u shc,I I he! Lit Iu,i:.1 4J110 IIlk-I► <br />hiyh..1 t 11,11i t hey invert. of t.he: out.10t I,il,t, to I lit' nt'xt <br />I. rCnch. <br />(;) The i►►vcrt of the out.I.et pipe to the next trench shall <br />be at lust two inches higher than, the invert of the <br />outlet pipe of the trench in which the box is located. <br />(4) When sewage tank effluent is delivered to the drop box by <br />a pump, the pump discharge shall be directed against a <br />„wall or side of the box on which there is no outlet. <br />(5) The drop box shall have a removable cover either flush <br />or above finished grade or covered by no more than six <br />inches of soil. <br />IV. DRAINFIELD - Final treatment and disposal of all sewage tank <br />effluent shall be by means of soil treatment. <br />1. SIZING <br />Indicated average percolation rate is 22.1 minutes per inch for <br />the primary site and 14.3 minutes per inch for the alternate <br />site. <br />• A. Total drainfield area is = 1050 ft2 (Required soil treatment <br />area based on a 4-bedroom house) <br />B. Drainfield trench bottom width is 3'. <br />C. TOTAL lineal feet of drain the is 350.,, <br />D. This requires 5 laterals of 70 feet in length. <br />See Figure 1 for typical placement. <br />E. Minimum spacing of laterals is 7.5 <br />0 <br />feet from center to center. <br />