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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. Details and results of the percolation test are summarized <br />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, <br />7/8/2019 <br />Shallow Test <br />3.26 22.7 4 hr. Satisfactoriy perc <br />rate <br />Note: A satisfactory percolation rate for a "shallow" test t.3.-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 />eight-foot separation between the bottom of dispersal system and ground water, or mitigation by system <br />design 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 standard septic system in accordance with <br />the requirements of the San Joaquin County Environmental Health Department. <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 (see Table 2). <br />Ground water is anticipated to be encountered approximately 90 to 100 feet below <br />ground surface at the Site; consequently, no modifications to standard septic systems <br />should be required. <br />Discussion of Septic System Sizing <br />Septic system construction utilizing leach lines and seepage pits should follow the San <br />Joaquin County On-Site Wastewater Treatment Systems Standards (2017) where <br />applicable. <br />LOGE 1934 Page 7