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percolation test hole must demonstrate a satisfactory percolation rate within the proposed septic system disposal field. Details and results of the percolation testing are summarized in the following table. Table 2. Percolation Test Summary Test No., Percolation Test Percolation Rate Test Duration Comments Date Tested Depth (ft.) (minutes/inch) (see notes) P1 -S, 9/3/2021 2.30 2.87 1 hr. Satisfactory perc. Shallow Test rate Note: A satisfactory percolation rate for a "shallow" test is greater than 1 but less than or equal to 60 minutes per inch. 1 Per San Joaquin County Environmental Health Department, a rate between 1.0 and 5.0 min/in requires a 20 -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 septic system in accordance with the requirements of the San Joaquin County Environmental Health Department. The percolation test is considered representative of soils within a 100 -foot radius of the test location. Because of the percolation rate between 1.0 and 5.0 min/in encountered in the test hole, the San Joaquin County Environmental Health Department will require a 20 -foot separation from the bottom of the dispersal systems to ground water. Based on the predicted depth to water of 59 to 71 feet, no modification to standard systems should be necessary. Discussion of Septic System Sizing Septic system construction should follow the San Joaquin County On -Site Wastewater Treatment Systems Standards (2017) where applicable. Because of setback requirements from surrounding wells, a shallow septic system will be required. Mr. Decker and Ms. Nickell are working with G&C Septic of Wilton, California; a filter bed system is proposed. LOGE 2145 Page 7