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Percolation Test Results <br /> The completed percolation test form is included in Appendix 3 of this report. The form <br /> was signed by Ms. Afonskaia and indicates a percolation rate for the hole based on the <br /> least water drop observed during the test period, as required by San Joaquin County <br /> Environmental Health Department policy (personal communication with Michael Kith, <br /> Lead REHS, November 19, 2019). <br /> 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 /> 11/6/2019 3.50 25.0 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 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 min/in encountered in the test hole, <br /> the 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 approximately 75 to 85 feet below ground surface at the <br /> Site; consequently, no modifications to standard septic systems should be required. <br /> Discussion of Septic System Sizing <br /> Septic system construction utilizing leach lines, leach lines with sumps, or a filter bed <br /> should follow the San Joaquin County On-Site Wastewater Treatment Systems <br /> Standards (2017) where applicable. <br /> LOGE 1945 Page 7 <br />