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SYSTEM DESIGN <br />FOR GARY RODFRICK <br />OF LOT 5, BLOCK 1, RINGERS;JOOD <br />8-16-85 <br />1. Percolation Rate, Type of System. <br />14 MPr on the primary site and 148 MPI on the alternate site. <br />Since the ho•ise is located on the primary site, the alternate <br />site will need to be used. Percolation results were obtained <br />by others and a rate of 148 would not normally qualify for a <br />mound system. However, it was noted that this area was tested <br />at a greater depth and thus if the upper layers were tested, a <br />much better rate would be obtained. <br />2. Proposed Flow Rate. <br />4 bedrooms @ 150 C.P.D. - 600 C.P.D. <br />3.Soil Treatment Area Needed. <br />600 C.P.D. x 0.83 factor is 500 Sq. Ft. of rock Led area, or a <br />bed 10 feet wide x 50 feet long. <br />4.Septic Tanks d Distribution System. <br />Two septic tanks of at least 1000 gallons and 750 gallons are <br />needed. In addition, a third pumping tank and pump are needed for <br />pressure distribution to the mound system. Distribution to the <br />ro^_k bed is to be through 3 perforated laterals 40" apart. ,.11 <br />materials and construction should adhere to the provis;o.:s of <br />the Ci�y of Orono. <br />5. Mound Dimensions. <br />Since trip ground slope is from 2-3i both the upslope atjd downslope <br />areas can be used.Unless additional percolation tests are perform- <br />ed, ar. extra 1 foot layer of sand or 2 feet total should be used <br />to insure adequate percolation in the upper two feet. The required <br />basal width is 5.0 x 10 feet rock bed width or 50 feet. _Thus, the <br />total width of the upslope and downslope must be at least 50 feet <br />minus 10 feet or 40 feet. With a 4 foot high mound, this would <br />amount to _greater than z 4:1 slope. <br />If anything eles is needed, please contact me. <br />Si nr•erel y, <br />PERCOR, INC. <br />Mark S. .,ronberg, F. <br />PCA Certifird <br />