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SYSTEM DESIGN <br />FOR PAUL SKOOG <br />OF LOT 3, BLOCK 2, RINGERSWOOD <br />ORONO, MINNESOTA <br />4-29-86 <br />1. Percolation Rate, Type of System. <br />73.8 minutes per inch on the primary site and 78.3 on the alternate site. <br />Pressure mound system on the primary, and on the alternate if ever needed <br />there. <br />2. Proposed Flow Rate. <br />3 bedrooms & 150 G.P.D. = 450 G.P.D. <br />3. Soil Treatment Area Needed. <br />0.83 factor when using 12" of clean sand under the rock bed x 450 G.P.D. = 375 <br />sq. ft. This is a rock bed 10 feet wide by 37.5 feet long. <br />4. Dike Width Needed. <br />The basal width factor for this soil is 5.00 so the r,:quired basal width is <br />5.00 x 10 feet = 50 feet. Subtracting 10 feet for the rock bed and because <br />of the flat ground, the dike will need to spread out at least 20 feet on <br />each side of the bed. This is more than a 4:1 slope so it is adequate. <br />The ends should slope at 4:1 or 12 feet out from the 3 foot high mound. <br />5. Distribution. <br />Distribution is to be by pressure to 3 perforated laterals located in <br />the 10 foot wide rock bed. <br />6. Septic -anks. <br />Two sep is tanks, the first of at least 1000 gallons and the second of at <br />least 74 gallons are needed. In addition, a third pumping tank is needed <br />to house the pump and meet the requirements for reserve capacity and dose <br />size. Ai alarm device wil! also be needed to warn of pump failure. <br />414 A e <br />7. All coo,;Tructionymust be kept off both the primary and alternate drainfield <br />sites. .All materii.ls and construction must adhere to the provisions of <br />Individual Sewage Treatment Systems Standards (WPC-40) and the City of Orono. <br />If any add'.tional information is needed, please contact me. <br />Sincerely, <br />PERCOR, INC. <br />Mark S. Gronberg <br />PCA certified <br />