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19 May 2021 <br />Project No. 21-6435 <br />Page 7 of 14 <br />chloride (PVC) casing with 0.020-inch slots was installed in the borehole to perform the <br />test. Gravel was added to the annulus of the borehole, between the borehole and the <br />casing. The borehole was then filled with water to a depth of 12 inches above the gravel <br />twice at the time of 0857. The test hole was then covered for 24 hours to allow for <br />complete saturation of the borehole. <br /> <br /> <br />6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK <br /> <br />On 14 May 2021, the boring was found to be completely dry, intact and in good condition. <br /> <br /> <br />6.4. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 98-02 <br /> <br />The work was performed in accordance with San Joaquin County Division 11 <br />Section 9-1105.2 (d) General Requirements. <br /> <br />On 14 May 2021, Percolation test procedure #3 was performed by adding water to <br />approximately six inches above the gravel and recording the amount of water remaining <br />in the borehole after 10-minute intervals for one hour. The water level was measured from <br />a fixed reference point at the top of the casing using a Solinst water level meter. The final <br />measurements were observed by the EHD inspector. Based on the field measurements <br />collected, the percolation rate for the parcel was calculated; the Percolation Test Rate <br />Field Sheet is provided in Appendix B. <br /> <br /> <br />6.5. COMPLETED PERCOLATION TEST FORM <br /> <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 B. <br /> <br /> <br />6.6. POTENTIAL PROBLEMS PREDICTED <br /> <br />On site soils within the shallow percolation test hole demonstrated an adequate <br />percolation rate. Additionally, the existing septic system has been operating properly. <br /> <br /> <br />6.7. PERCOLATION TEST FINDINGS <br /> <br />The shallow percolation test performed provided a satisfactory percolation test rate. The <br />percolation rate of 2.13 minutes per inch was calculated from data collected during the <br />one-hour percolation test; the final reading over the one-hour period was used to calculate <br />the percolation rate. The use of the existing and proposed septic systems should follow <br />the San Joaquin County On-site Wastewater Treatment Standards.