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minute per inch (min/in) but less than or equal to 30 min/in drop. For the Site to utilize a standard septic system, one percolation test (shallow or deep) 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, 7/5/2019 3.39 62.5 4 hr. Failed* Shallow Test P1, 7/5/2019 18.86 10.9 4 hr. Satisfactor�r perc. 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 test (shallow or deep) is required to pass for the area to be considered suitable for a standard septic system. 1 Per San Joaquin County Environmental Health Department, a rate between 5.0 and 30 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 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 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 (see Table 2). Ground water is anticipated to be encountered approximately 140 to 153 feet below ground surface at the Site; consequently, no modifications to standard septic systems should be required. Discussion of Septic System Sizing Septic system construction utilizing leach lines and seepage pits should follow the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) where applicable. Based on the history of septic system repair on the Site, as revealed through permit records, the customer may wish to consider oversizing the new septic system. Oversizing increases the absorption area and may reduce the need for repairs/additions in the future. LOGE 1850 Page 8