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30 March 2022 AdvancedGeo Project No. 22-6800 AnEmployee-Owned Company Page 8 of 15� 6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK On 25 March 2022, the boring was found to be completely dry, intact and in good condition. 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 25 March 2022, Percolation test procedure #2 was initially performed by adding water to approximately six inches above the sand and recording the amount of water remaining in the borehole after a 30 -minute interval. However, after 30 minutes the borehole was dry. Therefore, percolation test procedure #3 was performed by adding water to approximately six inches above the gravel and recording the amount of water remaining in the borehole at 10 -minute intervals for one hour. Additional water was added to the boring after each 10 -minute interval as required. The water level was measured from a fixed reference point at the top of the casing using a Solinst water level meter. The final measurements were observed by the EHD inspector. Based on the final measurement 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 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 an adequate percolation rate. Additionally, the existing septic system has been operating properly. The shallow percolation test performed provided a satisfactory percolation test rate. The percolation rate of 2.68 minutes per inch was calculated from data collected during the one-hour percolation test; the final 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.