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, <br />Tnm R at 7 <br />r . - I • *Ton Pov7 <br />SYSTEM DESIGN FOR BETZ BUILDERS <br />LOTS, BLOCK 1. McCULLEY FARM <br />ORONO, MINNESOTA <br />6-13-85 <br />1. Percolation Rate, Type of System. <br />Average rate « 11.4 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 2.00 factor x 600 G.P.D. = 1800 Sq. Ft. minimum since with the. <br />1 <br />shallow trenches extra rock can not be used under the pipe. <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 apftrt center to center and no <br />deeper than 0.8 feet in the natural soil near S.B. # 1 and 1.0 feet <br />near S.B. # 2 In order to maintain 3 feet of seperatlon from the water table. <br />5. Drainfield tock Needed. <br />44.4 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 <br />appears that a third pumping tank and pump will not be needed depending <br />on the final house elevation. <br />7. Additional Information. <br />An old access path to the farm buildings runs through this area and that <br />portion should be scarified ot^disked .to loosen the soil in the top <br />layers prior to drainfield construction. <br />Sincerely, <br />•PERCOR, INC. <br />Mark S. Gronberg, P,E. <br />PCA certified