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L.. <br />• (!) 'I'hei i►►vu► t ui tt►C, inlet. I,il►c! shall be .►t least une' inch <br />hiyhur th,i►i thu invu►t of the c►utlCt I)ipC to thL: nUxt_ <br />t rend►. <br />(.i) The invert of the outlet pipe to the next. trench shall <br />be at least 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 12.6 minutes r inch for <br />the primary site and 11.6 mi..ates per inch for the a-ternate <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 31. <br />C. TOTAL , ►eal 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. , nimum spacing of laterals is 7.5 feet from center to center <br />• <br />9- <br />1 <br />