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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. Garcia Ruiz and indicates a percolation rate for each 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 18 and 42 inches; a satisfactory percolation rate for a shallow test is greater than or equal to 1 minute per inch (min/in) but less than or equal to 60 min/in drop. A deep percolation test hole has a depth between 3.5 and 25 feet; a satisfactory percolation rate for a deep test is greater than or equal to 1 min/in but less than or equal to 30 min/in drop. For the Site to utilize a standard septic system, one percolation test hole (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 -S 5/3/2022 3.39 250 4 hr. Insufficient perc. Shallow Test rate P1 _D Satisfactory perc. 5/3/2022 4.48 11.9 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 min/in. A satisfactory percolation rate for a "deep" test is greater than 1 but less than or equal to 30 min/in. 1 Only one test hole (shallow or deep) must demonstrate a satisfactory percolation rate for the location to be considered acceptable for a standard system. Discussion of Percolation Test Results The soils in the proposed septic 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 an approximate 100 -foot radius of the test location. Discussion of Septic System Sizing Septic system construction utilizing leach lines with seepage pits should follow the San Joaquin County On -Site Wastewater Treatment Systems Standards (2017) where applicable. We understand that the second until dwelling will be connected to an existing septic system from a previous house on the Site. LOGE 2226 Page 7