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1. SIZING <br />Indicated average percolation rate is 9.4 minutes per inch for <br />the primary site and 26.4 minutes per inch for the alternate site. <br />A. Total drainfield area is = ft2 (Required soil treatment <br />area based on a 4 bedroom house) <br />ft2 (20% reduction of treatment <br />area with 12" of filter material) <br />=1000 ft2actua sox treatment area <br />B. Drainfie'd trench bottom width is 31. <br />C. TOTAL ] 1 feet of drain the is 400. <br />D. This re%i-fires 4 laterals of 100 feet in length. <br />See Figure for typical placement. <br />E. Minimum spacing of laterals is 7.5 feet from center to center. <br />�S <br />r <br />���t <br />