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` SYSTEM DESIGN <br /> FOR DOUGLAS KLINT <br /> ON DEERING ISLAND <br /> ORONO, MINNESOTA <br /> 8-14-85 <br /> 1 . Percolation Rate, Type of Sys�em . <br /> 42 . 6 minutes per inch for the primary site (holes 1-4 ) for <br /> a standard system . 37. 5 MPI on the alterna�e site for a <br /> standard system if ever used . <br /> 2 . Proposed F1ow Rate . <br /> Two bedrooms @ 150 G. P. D. = 300 G. P. D, bvt at times SO people <br /> so put in as many trenches as possible. <br /> 3 . Soil Treatment Area Needed. <br /> 2 . 0 percolation rate factor. Since 2100 Sq. Ft . of trenches <br /> appears possible, this would limit i✓ater usage to 1050 G. P. D. <br /> 4 . Size and Number of Trenches , <br /> --------------------------- <br /> It appears that 7 trenches 100 feet Iong and 3 feet wide can <br /> be used. These trenches would be spaced 7. 5 feet apart center to <br /> center and be 2-3 feet deep in the natural soi1 . <br /> 5 . Drainfield Rock Needed. <br /> 117 cubic yds . of rock is needed to have 12 inches under and 2 <br /> inches over a 4 inch distribution pipe. <br /> 6 . Septic Tanks. <br /> Two septic tanks each of at Ieast 1000 gallons should be used. <br /> It appears that with no basement, a third pumping tank and pump <br /> wi11 not be needed. <br /> 7, Additional Information . <br /> The drainfield trenches wi11 have to be constructed at Ieast 75 <br /> feet from Lake Minnetonka, no grading can be done on either the <br /> primary or the alternate sites, and runoff water should be div- <br /> erted from the drainfield site . <br /> Sincerely, <br /> YERCOR, INC. <br /> � <br /> Mark S. Gronberg, P. E. <br /> PCA certified <br />