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SYSTEM DESIGN <br />FOR JOE BOYER & SONS <br />LOT 3, BLOCK 1, STRONGHOLD <br />5-17-85 <br />1. Percolation Rate, Type of System. <br />34.4 minutes per inch. Standard System. <br />2. Proposed Flow Rate. <br />4 bedrooms O 150 G.P.D. = 600 G.P.D. <br />3. Soil Treatment Area Required. <br />2.0 percolation rate factor x 600 G.P.D. is 1200 Sq.Ft. minimum. <br />4. Size and Number of Trenches. <br />4 trenches 3 feet wide and 100 feet long would be 1200 Sq. Ft. <br />These trenches would be spaced a minimum of 7.5 feet apart center to <br />center, and be 2-3 feet deep in the natural soil. <br />5. Drainfield Rock Needed. <br />66.7 cubic yds. of rock is needed to have 12 inches under and 4 inches <br />over a 4 inch distribution pipe, <br />6. Septic Tanks. <br />Two septic tanks each of 1000 gallons are recommended. In addition, it <br />appears that either a third pumping tank and pump will be needed or else <br />an ejector pump in the lower floor required to reach the higher drain- <br />field area. <br />7. Additional Information. <br />Runoff water must be diverted from the drainfield area, especially if <br />the alternate site is ever used since it is closer to the existing <br />swale. <br />If any additional information is needed, please contact me. <br />Sincerely, <br />PERCOR, INC. <br />Mark S. Gronberg, P.E. r