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30 June 2022 AdvancedGeo <br /> Project No. 22-6900 An Employee-Owned Company <br /> Page 8 of 15 <br /> inch diameter polyvinyl chloride (PVC) casing with 0.020-inch slots was installed in the <br /> borehole to perform the test. Gravel was added to the annulus of the borehole, between <br /> the borehole and the casing. The borehole was then filled with water to a depth of <br /> 12 inches above the gravel at the time of 0835. The test hole was then covered for <br /> 24 hours to allow for complete saturation of the borehole. <br /> 6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK <br /> On 21 June 2022, the boring was found to be completely dry, intact and in good condition. <br /> 6.4. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 98-02 <br /> The work was performed in accordance with San Joaquin County Division 11 <br /> Section 9-1105.2 (d) General Requirements. <br /> On 21 June 2022, percolation test procedure #2 was performed by adding water to <br /> approximately six inches above the gravel and recording the amount of water remaining <br /> in the borehole at 30-minute intervals for a period of four hours. Additional water was <br /> added to the boring after each 30-minute interval as required to ensure that approximately <br /> six inches of water remained above the gravel. The water level was measured from a <br /> fixed reference point at the surface of the boring using a Solinst water level meter. <br /> Measurements were recorded at 30-minute intervals for four hours. The final two <br /> measurements were observed by the EHD inspector. Based on the final field <br /> measurement collected, the percolation rate for the parcel was calculated; the Percolation <br /> Test Rate Field Sheet is provided in Appendix D. <br /> 6.5. COMPLETED PERCOLATION TEST FORM <br /> After completion of the test, the EHD inspector reviewed the field data and signed the <br /> required EHD Percolation Test Rate form. Field measurements recorded during the test <br /> are included on the Percolation Test Rate Field Sheet provided in Appendix D. <br /> 6.6. POTENTIAL PROBLEMS PREDICTED <br /> Onsite soils within the shallow percolation test hole demonstrated an adequate <br /> percolation rate. Additionally, the existing septic system has been operating properly. <br /> 6.7. PERCOLATION TEST FINDINGS <br /> The shallow percolation test performed provided a satisfactory percolation test rate. The <br /> percolation rate of 9.25 minutes per inch was calculated from data collected during the <br />