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File No. CO-9018-SO1 <br /> June 11, 1991 <br /> minimum of 12-inches of water above the gravel base was added and allowed to soak for 24- <br /> hours. The percolation tests were then performed. <br /> The actual data sheets associated with each percolation test is included as Appendix A to this <br /> report. The percolation test results obtained are summarized below. <br /> Test Percolation Rates'(min/in) <br /> Hole Location Average Last Comments <br /> 1 Community 4 0 6 0 Lt. brown silty sand <br /> 2 Community 4 3 6 0 Lt. brown silty sand <br /> 3 Community 3 7 6 0 Lt. brown silty sand <br /> 4 Community 2 7 6 0 Lt. brown silty sand <br /> 5 Community 0 0 overnight water, cemented soil <br /> 6 Lot 37 1 8 2 0 Lt. brown silty sand <br /> 7 Lot 38 1 9 2 0 Lt. brown silty sand <br /> 8 Lot 39 8.5 9 Lt. brown silty sand <br /> 9 Lot 40 6 0 6 0 overnight water, cemented soil <br /> 1 0 Lot 41 6 0 6 0 overnight water, cemented soil <br /> ' Average values are for the total test duration. Last values are the rates for the last 30 minute <br /> test interval. <br /> The percolation test results used for design of septic leach fields are based on the "last' readings <br /> column tabulated above. The highest percolation rate allowed for leach line fields (without <br /> alternate septic system design by a registered engineer) is 60 (min/in). Thus, all locations <br /> tested meet or exceed this value except one location in the proposed community leach field area. <br /> However, many of the percolation rates are at the maximum value allowed. Therefore, seepage <br /> pits should be considered as an alternative to near-surface leach lines. The use of seepage pits <br /> are allowed to a maximum depth of 25 feet and would require performance of additional <br /> percolation tests at the design depth of the pits. As noted above, septic systems permits on file <br /> with the Environmental Health Division for single-family residences adjacent to one part of the <br /> project have successfully used both types of sewage disposal systems. <br /> Conclusions <br /> Based on a review of past records of septic systems permits adjacent to the one area of the site <br /> and the results of the 10 percolation tests performed at a depth of 36 inches, it is our opinion <br /> 3 <br />