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• Percolation Test Results The completed percolation test form is included in Appendix 3 of this report. The form was signed by Mr. Wong and indicates a percolation rate for the hole based on the final water drop observed. Per San Joaquin County Environmental Health Department's definition, a shallow percolation test hole has a depth between 36 and 42 inches; a satisfactory percolation rate for a shallow test is greater than 1 minute per inch (min/in) but less than or equal to 60 min/in drop. For the Site to utilize a standard septic system, one percolation test must demonstrate a satisfactory percolation rate within the proposed septic system disposal field. Details and results of the percolation test 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, 9/28/2018 3.00 2.1 1 hr. Satisfactory perc. Shallow Test rate Note: A satisfactory percolation rate for a"shallow"test is greater than 1 min/in but less than or equal to 60 min/in. • Discussion of Percolation Test Results The soils within the 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. Discussion of Septic System Sizing Septic system construction utilizing leach lines, leach lines and shallow sumps, or a filter bed should follow the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) where applicable. As discussed in the On-Site Wastewater Treatment Systems Standards, a percolation rate of greater than 1 min/in but less than 5 min/in requires 20 feet separation from the bottom of the septic system to ground water, the estimated depth to water in the area of the Site is 30 to 44 feet. • LOGE 1841 Page 7