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[6] Continued. <br /> As evidenced by the percolation test results, the heavy organic <br /> clay soil type is not conducive to efficient percolation. Two <br /> inches of water remained in the shallow test hole after 24 hrs of <br /> pre-saturation. The data obtained illustrates a percolation rate <br /> of 120 min/in after three hrs. <br /> The deep test hole was located at a depth of 9. 5 ft and produced <br /> a percolation rate of 40 min/in. The results of these percolation <br /> tests are discussed in the following section of this report. <br /> [7] CONCLUSIONS <br /> The percolation test results illustrate differing degrees of <br /> percolation rates. Although the shallow test boring indicates very <br /> little percolation, it is our opinion that the proposed leach field <br /> area may be engineered to adequately accept effluent. This opinion <br /> is primarily based on the fact that the coarse sand that was <br /> encountered during the exploratory drilling is found at <br /> approximately eight ft below grade. Additionally, as discussed <br /> earlier, it is recommended that a diverter valve in the <br /> distribution box be utilized to service one leach field at a time. <br /> The four most important factors affecting the performance of a <br /> septic system are percolative capacity, infiltrative capacity, soil <br /> particle size, and the disposal area loading rate. While <br /> percolative capacity has traditionally been one of the most <br /> important design factors for septic systems, it is the infiltrative <br /> capacity of the liquid soil interface which ultimately determines <br /> the viability of the disposal area. Our percolation test results, <br /> and the predominate sand structure encountered, indicate that the <br /> infiltrative capacity of the soil is adequate for the proposed <br /> septic system. Additionally, the disposal area loading rate will <br /> be mitigated by the use of a diverter valve. <br /> 5 <br /> Quality ��ontrol Inspection <br />