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13 August 2021 Advanced Project No. 21-6530 ''ploy "n'`' Page 7 of 14 ' 6.2. CONSTRUCTION OF PERCOLATION TEST HOLE On 12 August 2021, one boring was advanced for a shallow percolation test. The boring was advanced using a four -inch diameter hand auger to a depth of 42 inches bsg. Following borehole advancement, the sides of the boring were scraped, and loose material was removed from the borehole. Once the borehole was cleared of loose material, two inches of fine gravel was added to the bottom of the borehole and a two- inch diameter polyvinyl chloride (PVC) casing with 0.020 -inch slots was installed in the borehole to perform the test. Gravel was added to the annulus of the borehole, between the borehole and the casing. The borehole was then filled with water to a depth of 12 inches above the gravel at the time of 0800. The test hole was then covered for 24 hours to allow for complete saturation of the borehole. 6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK On 13 August 2021, the boring was found to be completely dry, intact and in good condition. 6.4. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 98-02 The work was performed in accordance with San Joaquin County Division 11 Section 9-1105.2 (d) General Requirements. On 13 August 2021, Percolation test procedure #2 was performed by adding water to approximately six inches above the gravel and recording the amount of water remaining in the borehole after 30 -minute intervals for a period of four hours. Additional water was added to the boring after each 30 -minute interval as required. The water level was measured from a fixed reference point at the top of the casing using a Solinst water level meter. The final measurements were observed by the EHD inspector. Based on the field measurements collected, the percolation rate for the parcel was calculated; the Percolation Test Rate Field Sheet is provided in Appendix C. 6.5. COMPLETED PERCOLATION TEST FORM After completion of the test, the EHD inspector reviewed the field data and signed the required EHD Percolation Test Rate form. Field measurements recorded during the test are included on the Percolation Test Rate Field Sheet provided in Appendix C.