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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 />P1, <br />3/4/2019 <br />Shallow Test <br />3.06 2.8 4 hr. Satisfactory perc. <br />rate' <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 1.0 and 5.0 min/in requires a 20' <br />separation between the bottom of dispersal system and ground water, or mitigation by system design or <br />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 1.0 and 5.0 encountered in the test hole, the <br />San Joaquin County Environmental Health Department will require a 20-foot separation <br />from the bottom of the dispersal system to ground water (see Table 2). Ground water is <br />anticipated to be encountered approximately 80 feet below ground surface at the Site; <br />consequently, no modifications to standard septic systems 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 1906 Page 7