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Ir <br />CVG IZ-1-7-9� <br />SYSTEM DESIGN <br />FOR GARY RODERICK <br />OF LOT 1, BLOCK 1, RINGERSWOOD <br />ORONO, MINNESOTA <br />12-17-85 <br />1. Percolation Rate, Type of System. <br />3 MPI on the primary site and 52 MPI on the alternate site. These results <br />are from testing by others and this design is based on using those results. <br />Mound systems under pressure. <br />2. Proposed Flow Rate. <br />5 possible bedrooms @ 150 G.P.D. = 750 G.P.D. <br />3. Soil Treatment Area Needed. <br />750 G.P.D. x 0.83 factor = 625 Sq. Ft. of rock bed area, or a bed 10 feet <br />wide by 62.5 feet long. <br />4. Septic Tanks & Distribution System. <br />Two septic tanks, the first of 1000 gallons and the second of at least 750 <br />gallons are needed. In addition ,a third pumping tank and pump are needed <br />for pressure distribution to the mound system. Distribution to the rock bed <br />is to be through 3 perforated laterals 40" apart. All materials and cons- <br />truction should adhere to the provisions of the City of Orono. <br />S. Mound D_mensions. <br />Since the ground slope is from 0-3% on the primary site, both the upslope <br />and downslope areas can be counted for the required basal width. With the <br />high water table, 2 feet of sand rather than 1 foot should be used making <br />the mound 4 feet high. 4:1 sideslopes should be used which will extend out <br />farther than the required basal width. <br />If there are any other questions, please contact me. <br />Sincerely, <br />PERCOR, INC. <br />Mark S. Gronberg <br />PCA certified <br />