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r <br />SYSTEM DESIGN <br />FOR GARY RODERICK <br />OF LOT 2, BLOCK I, ABINGDON GLEN <br />ORONO, MINNESOTA <br />7-28-86 <br />1. Percolation Rate, Type of System. <br />12.6 minutes per inch, Shallow Trench System. <br />2. Proposed Flow Rate. <br />4 bedrooms @ 150 G.P.D. = 600 G.P.D. <br />3. Soil Treatment Area Required. <br />Use 1.67 percolation factor x 600 G.P.D. = 1000 Sq. Ft. <br />4. Size and Number of Trenches. <br />Four trenches 3 feet wide and 83.3 feet long = 1000 Sq. Ft. These trenches <br />would be spaced a minimum of 7.5 feet apart center to center and be about <br />one foot deep in the natural soil. <br />5. Drainfield Rock Needed. <br />37.0 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, of 1000 and 750 gallons minimum are needed. In addition a <br />third pumping tank and pump are needed to reach the higher drainfield area. <br />The pump should also be equiped with an alarm device to warn of pump failure, <br />7. Additional Information. <br />All construction traffic must be kept off both the primary and alternate <br />drainfield sites and no grading may be done on the alternate area at any <br />time. All runoff water should be diverted from the drainfield area. The <br />original drainfield areas tested are in the proposed house location, so <br />these new areas were tested farther up on top of the knob. <br />If any additional is needed, please contact me. <br />Sincerely, <br />PERCOR, INC. <br />Mark S. Gronberg <br />PCA certified