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17 January 2020 AdvancedGe Project No. 19-4964 An Employee-Owned Company Page 8 of 14 6.4. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 98-02 The work was performed in accordance with San Joaquin County Division 11 Section 9-1105.2 (d) General Requirements. On 10 January 2020, the percolation test hole was dry after sitting overnight. Percolation test procedure #2 was performed by adding water to approximately six inches above the sand and recording the amount of water remaining in the borehole at 30-minute intervals for a period of one hour. After one hour of testing, and during both readings, water that was added for the test completely percolated the hole. After one hour of equalization time procedure #3 was performed by adding water to the percolation hole at five- and ten- minute intervals. During the entire test the water level was measured from a fixed reference point at the surface of the boring using a Solinst water level meter. Measurements were recorded at 30-minute intervals during the first hour and at five-and ten-minute intervals for the final hour. The final six measurements were observed by an EHD inspector. Based on the field measurements collected, the percolation rate for the parcel was calculated; the Percolation Test Rate field sheet is provided in Appendix D. 6.5. COMPLETED PERCOLATION TEST FORM After completion of the successful test, the EHD inspector reviewed the field data and signed the required EHD Percolation Test Rate form. Field measurements recorded during the test are included on the Percolation Test Rate Field Sheet provided in Appendix D. 6.6. POTENTIAL PROBLEMS PREDICTED On site soils within the shallow percolation test hole demonstrated adequate percolation rates. Additionally, the existing septic system has been properly operating. 6.7. PERCOLATION TEST FINDINGS The shallow percolation test performed provided a satisfactory percolation test rate. The percolation rate of 1.19 minutes per inch was calculated from data collected during the final hour of the percolation test; the smallest reading over the one-hour period was used to calculate the percolation rate. The use of the existing and proposed septic systems should follow the San Joaquin County On-site Wastewater Treatment Standards. 7.0. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL Soil chemical properties were supplied by regionally sourced material for the surrounding area.