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28 September 2022 Project No. 22-6994 Page 8 of 15 AdvantedGeo An Employee- Owned iCompany 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 08.40. The test hole was then covered for 24 hours to allow for complete saturation of the borehole. On 26 September 2022, one boring was advanced for a deep percolation test. The boring was advanced using a four -inch diameter hand auger to a depth of 118 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 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 08.50. 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 15 September 2022, the shallow boring (P-1) was found intact, in good condition, and with approximately two inches of water remaining in the borehole. On 27 September 2022, the deep boring (P-2) was found 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 15 September 2022, Percolation test Procedure #2 was performed at P-1 by adding water to approximately six inches above the gravel and recording the amount of water remaining in the borehole after a 30 -minute interval. 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. On 27 September 2022, Percolation test Procedure #2 was initially performed at P-2 by adding water to approximately six inches above the gravel and recording the amount of water remaining in the borehole after a 30 -minute interval. However, after 30 minutes the borehole was dry. Therefore, percolation test procedure #3 was performed by adding water to approximately six inches above the gravel and recording the amount of water remaining in the borehole at 10 -minute intervals for 1.5 hours. Additional water was added