Laserfiche WebLink
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 hole must demonstrate a satisfactory percolation rate within the <br /> 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-S, <br /> 3/1/2021 3.17 10.0 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 30.0 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 within the proposed sewage disposal area of the Site 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. This <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 may require an 8-foot <br /> separation from the bottom of the dispersal system to ground water, or other system <br /> modification. Ground water was encountered from 6.3 to 7.5 feet below ground surface <br /> at the Site. <br /> Discussion of Septic System Sizing <br /> Septic system construction utilizing leach lines or a filter bed should follow the San <br /> Joaquin County On-Site Wastewater Treatment Systems Standards (2017) where <br /> applicable. It should be noted that, if high ground water should occur due to flooding or <br /> unusual island pumping, the septic tank could become buoyant; additional measures to <br /> secure the tank should be considered. <br /> LOGE 2110 Page 7 <br />