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23 October 2020 AdvancedGeo <br /> Project No. 20-6169 AnEmployee-Owned Company <br /> Page 8 of 15 <br /> filled with water to a depth of 12 inches above the gravel at the time of 0830. The test <br /> hole was then covered for 24 hours to allow for complete saturation of the borehole. <br /> 6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK <br /> On 16 October 2020, the boring was found to be completely dry, intact and in good <br /> 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 16 October 2020, the percolation test hole was dry after sitting overnight. Percolation <br /> test procedure #2 was initially performed by adding water to approximately six inches <br /> above the gravel and recording the amount of water remaining in the borehole after 30- <br /> minute intervals. However, after less than 20 minutes all the water drained out of the test <br /> hole. Therefore, procedure#3 was performed by adding water to approximately six inches <br /> above the sand and recording the amount of water remaining in the borehole at 10-minute <br /> intervals for one hour. The water level was measured from a fixed reference point at the <br /> surface of the boring using a Solinst water level meter. Measurements were recorded at <br /> 10-minute intervals for one hour. The final measurement was observed by the EHD <br /> inspector. Based on the field measurements collected, the percolation rate for the parcel <br /> was calculated; the Percolation 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 /> On site soils within the shallow percolation test hole demonstrated adequate percolation <br /> rates. Additionally, the existing septic system has been properly operating. <br /> 6.7. PERCOLATION TEST FINDINGS <br /> The shallow percolation test performed provided a satisfactory percolation test rate. The <br /> percolation rate of 2.69 minutes per inch was calculated from data collected during the <br /> one-hour percolation test; the smallest reading over the one-hour period was used to <br />