SR0081887 SSNL - Laserfiche WebLink

Home Browse Search

Table 2. Percolation Test Summary Test No., Percolation Test Percolation Rate Test Duration Comments Date Tested Depth (ft.) (minutes/inch) (see notes) P1-S 3/12/2020 3.39 62.5 4 hr. Failed* Shallow Test P1-D Satisfactory perc. 3/12/2020 15.17 27.8 4 hr. rate Deep Test Note: A satisfactory percolation rate for a "shallow" test is greater than 1 but less than or equal to 60 minutes per inch. A satisfactory percolation rate for a "deep" test is greater than 1 but less than or equal to 30 minutes per inch. Only one passing test (shallow or deep) is required for the property to be approved for a standard septic system. 1 Per San Joaquin County Environmental Health Department, a rate between 5.0 and 30.0 min/in requires an eight-foot separation between the bottom of dispersal system and ground water, or mitigation by system design or enhancement. Discussion of Percolation Test Results The soils within the proposed sewage disposal area of the Site have demonstrated a satisfactory percolation rate for the use of a standard deep septic system in accordance with the requirements of the San Joaquin County Environmental Health Department. Because of the percolation rate between 5.0 and 30.0 min/in encountered in the deep test hole, the San Joaquin County Environmental Health Department will require an eight-foot separation from the bottom of the dispersal system to ground water, or mitigation by system design or enhancement. Ground water is anticipated to be encountered approximately 96 to 100 feet below ground surface at the Site; as a result, no modification to a standard septic system should be required. Discussion of Septic System Sizing Septic system construction should follow the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) where applicable. LOGE 20-10 Page 7