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III. GRAINFIELD <br />Final treatment and disposal of all sewage tank effluent shall be by means of <br />soil treatment. <br />1. SIZING ✓" <br />Indicated average percolation rates is 6.5 minutes per inch for the primary <br />site. ✓ <br />A. Total drainfield area is 762 ft2 (Required soil treatment area based on a <br />4 -bedroom Type 1 house). <br />B. Drainfield trench bottom width is 3' <br />C. Total lineal feet of drain tile is 2541.' <br />D. See detail for typical placement. 11-11 <br />E. Minimum spacing of laterals is 7.5 feet from rentor to center. <br />2. LOCATION <br />A. On slopes in excess of 1? percent the soil profile shall be carefully <br />evaluated in the location of the proposed soil treatment area and downslope <br />to identify the presence of layers that may cause sidehill seepage. In no <br />case shall a trench he located within 15 feet of such a layer surfacing on <br />the downslope. <br />B. Bed construction shall be limited to areas having natural slopes of less <br />than six percent. <br />C. Any soil treatment area other than seepage pits shall be set, bick the <br />following distances from the features given below: <br />Set back distance <br />Feature in feet <br />Any other water supply well or buried 75' <br />water suction pipe <br />Buried pipe distributing water under pressure l.0' <br />Buildings 20' <br />Property lines 10' <br />