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percolation test hole must demonstrate a satisfactory percolation rate within 100 feet of <br /> the 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, <br /> 4/8/2026 2.52 7.81 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 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 near the future septic disposal area for the new house have demonstrated a <br /> satisfactory percolation rate for the use of a septic system in accordance with the <br /> requirements of the San Joaquin County Environmental Health Department. The <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 8-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 35 to 40 feet, no <br /> modification to standard septic systems should be necessary to comply with this <br /> requirement. <br /> Discussion of Septic System Sizing <br /> Any future septic system construction should follow the San Joaquin County On-Site <br /> Wastewater Treatment Systems Standards (2017) where applicable. In this area, only <br /> shallow septic systems including leach lines, filter beds, or leach lines with shallow <br /> sumps are typically permitted. Additional considerations related to nitrate loading are <br /> discussed in the following sections. <br /> LOGE 2618 Page 7 <br />