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4 <br />- 0 -ft <br />SYSTEM DESIVI / O \v J <br />FOR ROiIERT WAADE CONSTRUCTION 0 <br />C'RONO, MINNESOTA <br />11-7-86 <br />1. I.ercolation Rate. Typa of System. �! <br />Iri:,ary site(holes 1-2) = 64.0 minutes per inch, Pressure mound system. <br />Alternate site(holes 3-4) = 108.0 minutes per inch. Pressure mound sys- <br />tem if ever needed, but shift toward holes 2 and 3 for better soils. <br />2. Proposed flow Rate. 100 <br />& 4'tedroc-is 0 150 G.P.D. _'0 G.P.D. <br />3. Soil Treatment Area Needed. -7 s D <br />q(O,,M G.P.D. x O.83 factor for at least 12" depth of clean sand •/4'5 SQ. Ft. <br />or a rock bed 10 feet wide by fi2:5Tfeet long minimum. <br />4. Basal Width Requirements. W <br />For 64.0 perc. rate use 5.0 factor x 10 foot wide bed = 50 feet total or <br />40 feet downslope from the edge of the bed. This should amount to greater <br />than a 3: 1 slope on the downslope. Slope other sides at least 3: 1. <br />S. Distribution. <br />Distribution is to be by pressure through to 3 perforated laterals spaced <br />40" apart center to center in the 10 foot wide rock bed. <br />6. Septic Tanks. <br />Two septic tanks, each of at least 1000 gallons are needed. In addition, <br />a third pumping tank and pump are needed for the pressure distribution. <br />Iii alarm device is needed to warn of pump failure. <br />7. Aiditional Information. <br />All construction and materials must adhere to the provisions of the <br />C?ty of Orono. Runoff water should be diverted from the drainfield <br />area. and both the primary and alternate site must be kept free from <br />construction traffic and grading. <br />If any additional information Is needed, please contact me. <br />Sincerely, <br />PERCOR, INC. <br />'1�,�i r `ii <br />Mark S. Gronberg, <br />PGA certified <br />