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percolation test hole must demonstrate a satisfactory percolation rate within the <br />proposed 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 />P1 -S, <br />8/26/2021 2.00 16.7 4 hr. Satisfactory perc. <br />rate <br />Shallow Test <br />Note: A satisfactory percolation rate for a "shallow" test is greater than 1 but less than or equal to 60 minutes per <br />inch. <br />1 Per San Joaquin County Environmental Health Department, a rate between 5.0 and 30.0 min/in requires an <br />8 -foot separation between the bottom of dispersal system and ground water, or mitigation by system design <br />or enhancement. <br />Discussion of Percolation Test Results <br />The soils within the proposed sewage disposal area of the Site have demonstrated a <br />satisfactory percolation rate for the use of a shallow septic system in accordance with <br />the requirements of the San Joaquin County Environmental Health Department. This <br />percolation test is considered representative of soils within a 100 -foot radius of the test <br />location. <br />Because of the percolation rate between 5.0 and 30.0 min/in encountered in the test <br />hole, the San Joaquin County Environmental Health Department will require an eight - <br />foot separation from the bottom of the dispersal system to ground water, or other <br />system modification. Based on the maps reviewed, the depth to ground water below <br />the Site is estimated to be approximately 10 to 15 feet. <br />Discussion of Septic System Sizing <br />Septic system construction utilizing leach lines or a filter bed should follow the San <br />Joaquin County On -Site Wastewater Treatment Systems Standards (2017) where <br />applicable. <br />LOGE 2142 Page 8 <br />