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30 March 2021 AdvancedGeo Project No. 21-6352 An Employet-Owned Company Page 8 of 15 6.1. NUMBER OF PERCOLATION TESTS PERFORMED One shallow percolation test was performed at the site. The appropriate percolation test procedure established by the EHD was followed for the test (Procedure #2). The percolation test hole was pre-soaked overnight for 24 hours followed by a four-hour percolation testing period. 6.2. CONSTRUCTION OF PERCOLATION TEST HOLE On 18 March 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 19 March 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 19 March 2021, Percolation test procedure #2 was performed by adding water to approximately six inches above the sand 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.