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20 January 2021 <br />Project No. 20-6284 <br />Page 8 of 14 <br />AdvancedGeo <br />An Employee-Owned <br />CCompony <br />6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK <br />On 15 January 2021, 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 15 January 2021, 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 sand and recording the amount of water remaining in the borehole after 30 - <br />minute intervals. However, after less than 30 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 gravel and recording the amount of water remaining in the borehole at 10 - <br />minute intervals for one hour and then at 5 -minute intervals for 30 minutes. The water <br />level was measured from a fixed reference point at the surface of the boring using a <br />Solinst water level meter. Measurements were recorded at 5 -minute intervals for 30 <br />minutes. The final measurement was observed by the EHD inspector. Based on the field <br />measurements collected, the percolation rate for the parcel was calculated. The <br />Percolation Test Rate Field Sheet is provided in Appendix C. <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 C. <br />6.6. POTENTIAL PROBLEMS PREDICTED <br />On site soils within the shallow percolation test hole demonstrated adequate percolation <br />rates. Additionally, the former septic system had been operating properly before being <br />destroyed. <br />6.7. PERCOLATION TEST FINDINGS <br />The shallow percolation test performed provided a satisfactory percolation test rate. The <br />percolation rate of 1.30 minutes per inch was calculated from data collected during the <br />percolation test; the smallest reading over the 30 -minute period was used to calculate the <br />