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SYSTEM DESIGN <br />FOR B b N CORPORATT^'1 <br />LOT 4, BLOCK 2, RINGERSWOOD <br />ORONO, MINNESOTA <br />1-6-Pq <br />1. Percolation Rate, Type of System. <br />Percolation tests and soil rings were taken by others. From informa- <br />tion supplied, the primary site had an average percolation rate of <br />107 MPI, and a possible high water table at 1.2 feet. Thus, a pressure <br />MO add system according to basal width will be needed. <br />2. Proposed Flow Rate. <br />pr�posed bedrooms @ 150 GPD is 600 GPD. <br />3. Soil Treatment Area Needed. <br />600 GPD x 0.83 factor is 500 Sq. r;.. of rock bed area or i bed 10 feet <br />wide by 50 feet long. <br />4. Septic Tanks and Distribution System. <br />Two septic tanks of 1000 gallons each are recommended. Also, a third <br />humping tank will be needed to house the pump required for pressure <br />distribution to the mound area. Distribution to the rock bed is to be <br />through 3 perforated laterals 40" apart. All construction and materials <br />should adhere to the provisions of the City of Orono. <br />5. Mound Dimensions. <br />For a percolation rate between 61-120 MPI a factor of 5.00 is used <br />resulting in a basal width rf 5.OU x the rock bed width .f 10 feet <br />or 50 feet. Since the ground slope is from 0-3% both the downslope <br />and upslope can be used for this width. Because of the high possible <br />water table, a 2 foot layer of clean sand will be needed under the <br />mound, with the total height of the mound being 4 feet. Thus,since <br />the slopes have to extend out about 20 feet from each side to get <br />the required basal width, the sideslopes would be about 5:1 which <br />would be better than the 3:1 required mininum. <br />Sincerely, <br />PERCOR, INC. <br />Mark S. Gronberg, P.E. <br />