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. <br /> SYSTEM DESIGN <br /> FOR MELVIN PETERSON � <br /> LOT 2, BLOCK 1 , STIELOWS ADDITION <br /> ORONO, MINNESOTA <br /> 6-17-85 <br /> 1 . Percolation Rate, Type of System. . <br /> 26.3 minutes per inch on the primary site(holes 1-4) and 70.0 minutes per � <br /> inch on the alternate site(holes 5-6). Shallow Trench system on the prim- <br /> ary site if an interceptor draintile is used (otherwise a mound system). <br /> Nbund system on the alternate site. <br /> 2. Proposed Flow Rate. <br /> 4 bedrooms @ 150 G.P.D. = 600 G.P.D. <br /> 3. Soil Treatment Area Required. <br /> Use 2.0 factor x 600 G.P.D. = 1200 Sq. Ft. minimum. <br /> 4. Size and Number of Trenches. <br /> 4 trenches 3 feet wide and 100 feet long = 1200 Sq. Ft. These trenches �. <br /> would be spaced a minimum of 7.5 feet apart center to center and be <br /> about 1 foot deep in the natural soil . The interceptor draintile would <br /> be 10 feet upslope from the upper trench and be at least 3 feet deeper <br /> than the bottom of the lowest drainfield trench. <br /> 5. Drainfield 13�ck Needed. <br /> 44.4 cu, 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. It appears that <br /> the house elevation could be high enough so that gravity flow could be <br /> maintained and a third pumping tank and pump would not be necessary. <br /> 7. Additional Info rmation: <br /> The primary site had quite a bit of black loam that has washed down the <br /> slope over the years which would enable the shallow trenches to be used <br /> if the water table is lowered by the draintile. The alternate site had <br /> little topsoil and a slower percolation rate which would require a mound <br /> system anyway. <br /> Sincerely, <br /> PERCOR, INC. <br /> Ma�� � <br /> Gronberg, P. . <br /> PCA certified � <br />