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19 May 2021 AdvancedGeo Project No. 21-6435 An Employee-Owned Company Page 7 of 14 chloride (PVC) casing with 0.020-inch slots was installed in the borehole to perform the test. Gravel was added to the annulus of the borehole, between the borehole and the casing. The borehole was then filled with water to a depth of 12 inches above the gravel twice at the time of 0857. The test hole was then covered for 24 hours to allow for complete saturation of the borehole. 6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK On 14 May 2021, 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 14 May 2021, 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 after 10-minute intervals for one hour. 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 field measurements collected, the percolation rate for the parcel was calculated; the Percolation Test Rate Field Sheet is provided in Appendix B. 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 B. 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. 6.7. PERCOLATION TEST FINDINGS The shallow percolation test performed provided a satisfactory percolation test rate. The percolation rate of 2.13 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.