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SYSTEM DESIGN <br />FOR EIOEN CONSTRUCTION <br />OF LOT 9, BLOCK I, ABINGDON GLEN <br />ORONO, MINNESOTA <br />11-5-87 <br />1. Percolation Rate, Type of System. <br />30.8 minutes per inch. Shallow Trench System with an interceptor draintile. <br />2. Proposed Flow Rate. <br />4 bedrooms @ 150 G.P.D. = 600 G.P.D. <br />3. Soil Treatment Area Needed. <br />Use 2.20 factor x 600 G.P.D. = 1320 Sq. Ft. <br />4. Size and Number of Trenches. <br />4 trenches 3 feet wide and 110 feet long = 1320 Sq. Ft. These trenches would <br />be spaced 7.5 feet apart center to center and be 0.5 ta 1.0 feet deep in the <br />natural soil. If 1.0 feet deep, the interceptor draintile would need to be <br />at least 3 feet lower than the bottom of the trench. <br />5. Drainfield Rock Needed. <br />44.4 cubic yards 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 tanks of at least 1000 gallons are needed. Depending on the final hous^ <br />elevation, it may be necessary to have a third pumping tank of at least <br />gallons. <br />7. All construction and materials must adhere to the provisions of the City of <br />Orono. All grading and construction traffic must be kept from both the pri­ <br />mary and the alternate drainfield sites. The interceptor draintile must be <br />at least 10 feet upslope from the highest trench. If any other information <br />is needed, please contact me. <br />Sincerely, <br />PERCOR, INC. <br />Mark S. Gronberg, ^ <br />PCA certified <br />ESS