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Per San Joaquin County Environmental Health Department's definition, a shallow <br /> percolation test hole has a depth between 36 and 42 inches; a satisfactory percolation <br /> rate for a shallow test is greater than or equal to 1 minute per inch (min/in) but less than <br /> or equal to 60 min/in drop. For the Site to utilize a standard septic system, one <br /> percolation test must demonstrate a satisfactory percolation rate within the proposed <br /> septic system disposal field. <br /> Details and results of the percolation testing are summarized in the following table. <br /> Table 2. Percolation Test Summary <br /> Test No., Percolation Test Percolation Rate Test Duration Comments <br /> Date Tested Depth (ft.) (minutes/inch) (see notes) <br /> P-1 <br /> 2/19/2018 3.31 5.6 1 hr. Satisfactory perc. <br /> rate <br /> Shallow Test <br /> P-2 <br /> 2/19/2018 3.46 17.86 4 hr Satisfactory perc. <br /> rate <br /> Shallow Test <br /> P-3 <br /> 2/19/2018 3.35 6.9 1 hr Satisfactory perc. <br /> Shallow Test rate <br /> Note: A satisfactory percolation rate for a "shallow" test is greater than one min/in and less than or equal to 60 <br /> min/in. <br /> 1 Requires an eight-foot separation between bottom of dispersal system and ground water, or mitigation by <br /> system design or enhancement, per San Joaquin County Environmental Health Department requirements. <br /> Discussion of Percolation Test Results <br /> The soils within the proposed sewage disposal area of the Site have demonstrated <br /> satisfactory percolation rates in accordance with the requirements of the San Joaquin <br /> County Environmental Health Department. <br /> Because of the percolation rate between 5.0 and 30 minutes per inch encountered, the <br /> San Joaquin County Environmental Health Department will require an eight-foot <br /> separation from the bottom of the dispersal system to ground water. Ground water is <br /> anticipated to be encountered from 30 to 32 feet below ground surface at the Site; <br /> consequently, no modifications to shallow septic systems should be required as a result <br /> of the percolation rates. <br /> LOGE 1947 Page 7 <br />