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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 Mr. Girardi and indicates a percolation rate for the hole based on the final <br />water drop observed. <br />Per San Joaquin County Environmental Health Department's definition, a shallow <br />percolation test hole has a depth between 18 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 />P1, <br />4/5/2022 2.52 2.45 4 hr. Satisfactory perc. <br />Shallow Test 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 <br />20 -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 1.0 and 5.0 min/in encountered in the test <br />hole, the San Joaquin County Environmental Health Department will require a 20 -foot <br />separation from the bottom of the dispersal system to ground water, unless mitigated by <br />system design or enhancement. Given the estimated depth to water of 83 to 89 feet, no <br />modification to a standard system should be necessary to fulfill this requirement. <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 2221 Page 7 <br />