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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 Satisfactory <br /> 4/28/26 3.24 10.4 4 hr. <br /> Shallow Test perc. 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 <br /> design or enhancement. <br /> Discussion of Percolation Test Results <br /> The soils near the proposed septic disposal area for the new ADU 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 /> Discussion of Septic System Sizing <br /> Septic system construction should follow the San Joaquin County On-Site Wastewater <br /> Treatment Systems Standards (2017) where applicable. In this area, most septic <br /> systems utilize leach lines with seepage pits. Additional considerations related to nitrate <br /> loading are discussed in the following section. <br /> LOGE 2620 Page 7 <br />