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©RUCE BREN HOMES <br />LOT 4, BLOCK 1, McCUL:.Ei' FARMS <br />System Design <br />1. Percolation Rate, Type of System. <br />1/.% m-nutes per inch on the primary site(holes 1-4), Shallow Trench System. <br />2. Proposed Flow Rate. <br />4 bedrooms @ 150 C.P.D. is 600 G.P.D. <br />3. Soil Treatment Area Required. <br />2.00 percolation rate x 6.0 G.P.D. is 600 C.P.D. <br />4. Size an9 Number of Trenches. <br />4 trenches 3 feet wide and 100 feet long is 1200 Sq. Ft. These trenches <br />would be spaced a minimum of 7.: feet apart center to center and be no <br />deeper than 0.8 feet deep in the natural soil unless the interceptor drain <br />lowers the water table to at least 3 feet below the bottom of the lowest <br />drainfield trench. <br />5. Drainfield Rock Needed. <br />44.4 cubic yds, of rock is needed to have 6 inches under a„d 2 inches over <br />a 4 inch distribution pipe. <br />6. Septic Tanks. <br />Two septic tanks each of 1000 gallons are recommended. In addition, a third <br />pumping tank and pump will be needed to reach the higher drainfield area. <br />