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SYST-�Y, DRSIGN <br />1. Percolation Rate, Type, of System <br />16.6 minutes per inch. Standard system with trenches no deeper <br />than 2-2,5 feet, <br />2. Proposed Flow Rate <br />4 bedroom house = 600 gallons per day(GPD), <br />3- Soil Treatment Area Required <br />For a percolation rate from 16-30 NPI a factor of 1.67 times the <br />flow rate a 1000 sg.ft, of area is required. <br />!�. 31" juA Humber of Trenohes <br />Five trenches 2 feet wide and 100 feet long would yield 1000 sq.ft. <br />Two foot wide trenches should be spaced 6.5 feet minimwe venter to <br />center. <br />5. Filter Needed <br />55.6 cub+, yards of rook is needed for 1000 sq.ft, of drainfield <br />with 12 1es or rock below and 2 inehes over a 4 inch pipe. <br />6. septic Ys <br />Two 1000 gallon septic tanks are recommended, <br />