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•-- <br />SYSTEM DESIGN <br />FOR MCNULTY CONST. <br />LOT 1, BLCCK 1 <br />HI ACRES 7.10 <br />2-21-83 <br />1. Percolation Rate. Type_of System. <br />21.5 Minutes per Inch. Standard System. <br />2. Proposed Flow Rate. <br />4 bedrooms Cr- 150 G.P.D. is 60C. G.F.D. <br />3. Soil Treatment Area Required. <br />1.67 percolation factor x 600 G.Y.D. is 1000 so. ft. min. <br />4..Size .-.d Number of Trenches. <br />Three trenches with a total length of 333 f t. x 3 feet wide <br />is 1000 sq. f t. These trenches should be spaced a minimum of <br />7.5 f t. center to center, and should be 2-3 feet deep in the <br />natural soil. <br />5. Drainfield Rock Required. <br />55.6 cu. yds. of rock is needed to have 12 inches under and <br />2 inches over a 4 inch distribution pipe. <br />6. Septic Tanks. <br />2 septic tanks each c at least 1000 gallon capacity are <br />required. In addition, if the house is kept at the proposrd <br />elevation, it will be necessary to have a third pumping <br />tank and pump in order to reach the higher drainfield Brea. <br />Distribution to the trenches should he by the use of drop <br />boxes <br />Sincerely, <br />PERCCR, INC. <br />Mark S. Gronberg. P.E. <br />r <br />