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11 October 2019 <br />AGE Project No. 19-4782 <br />Page 8 of 14 <br />was located in the leach field area of the proposed septic system (Figure 2). Following <br />borehole advancement, the sides of the boring were scraped, and loose material was <br />removed from the borehole. Once the borehole was cleared of loose material, two inches <br />of fine gravel was added to the borehole. The borehole was then filled with water to a <br />depth of approximately 12 inches above the gravel at the time of 0850. The test hole was <br />then covered for 24 hours to allow for complete saturation of the borehole. <br /> <br /> <br />6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK <br /> <br />On 19 June 2019, 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 Section <br />9-1105.2 (d) General Requirements. On 19 July 2019, the percolation test was performed <br />by recording the amount of water remaining in the borehole at 30-minute intervals for a <br />period of four hours. Additional water was added to the boring after each 30-minute <br />interval as required to ensure that approximately six inches of water remained above the <br />gravel. The water level was measured from a fixed reference point at the surface of the <br />boring using a Solinst water level meter. Measurements were recorded at 30-minute <br />intervals for four hours. The final two measurements were 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 /> <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 D. <br /> <br /> <br />6.6. POTENTIAL PROBLEMS PREDICTED <br /> <br />On site soils within the shallow percolation test hole demonstrated adequate percolation <br />rates. <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 41.67 minutes per inch was calculated from data collected during the <br />four-hour percolation test; the smallest reading over the four-hour period was used to <br />calculate the percolation rate. The use of the proposed septic system should follow the <br />San Joaquin County On-site Wastewater Disposal Standards.