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SYSTEM DESIGN <br />FOR DAVID A. WILLIAMS CONSTRUCTION <br />LOT 1, BLOCK 1, THE NURSERY <br />ORONO, MINNESOTA <br />11-8-85 <br />1. Percolation Rate. Type of System. <br />33.5 minutes per inch. Shallow trench system for the primary site(holes 1-4). <br />2. Proposed Flow Rate. <br />3 bedrooms 9 150 G.P.D. = 450 G.P.D. <br />3. So i 1 Treatment Area Requ i red . <br />2.0 percolation rate factor x 450 G.P.D.= 900 Sq. Ft. minimum. <br />4. Size and Number of Trenches. <br />3 trenches 3 feet wide and 100 feet long = 900 Sq. Ft. These trenches <br />would be spaced a minimum of 7.5 feet apart center to center and be no <br />deeper than 1.5 feet near soil boring # 1. <br />5. Grainfield Flock Needed. <br />33.3 cubic yds. of rock is needed to have 6 inches under and 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, it appears <br />that a third pumping tank and pump will be needed to reach the higher drain - <br />field area. <br />7. Additional Information. <br />Drainage must be diverted from the drainfield area and no grading or construc- <br />tion traffic is allowed on either the primary or alternate drainfield sites. <br />All construction and materials must adhere to the provisions of the City of <br />Orono. <br />If there are any other questions, please contact me. <br />Sincerely, <br />PERCORR, INC. <br />Mark S. Gronberg, P <br />PCA certified <br />