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SYSTEM DESIGN <br />1, Percolation Rate, rl�rpe of System <br />29.0 Minutes per inch. Shallow french System. <br />2.,Proposed Flow Rate <br />3 bedrooms. 150 gal.ons per bedroom per day = 450 GPD. <br />3. Soil Treatment AreaReouired <br />1.67 sq.ft. per GPD for 16-30 percolation rate or 2.00 sq.ft. <br />per GPD for 30-45 percolation rate = 750 to 900 sq.ft. <br />4. Size of Trenches <br />3 trenches eAch 100 feet long and 3 foot wide would yield 900 <br />sq.ft, of soil treatment area. These trenches would be spaced a <br />YhinimTri of 7.5 feet centAr to -6enter. <br />5, Septic Tanks I <br />Existing tank(s) should be -Inspected for suitabilit-, A second <br />tank should be installed if one is not present. <br />6. Filter ?Material Required <br />or 900 sq.ft. of trench bottom 33.3 cubic meat of rock is req- <br />uirdd-°for 6 -inches of rock bolbtr th6 pipe and 2 inches of dock <br />over the 4 inch distribution pipe. <br />