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09 August 2022 AdvancedGeo Project No. 22-6942 An Employer-Owned Company Page 8 of 16 Q 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 #3). The percolation test hole was pre-soaked overnight for 24 hours followed by a one-hour percolation testing period. 6.2. CONSTRUCTION OF PERCOLATION TEST HOLE On 01 August 2022, 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 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 08:35. 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 02 August 2022, 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 02 August 2022, Percolation test procedure #2 was initially performed 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 5 -minute intervals for one-half hour. Additional water was added to the boring after each 5 -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 final measurement collected, the percolation rate for the parcel was calculated. The Percolation Test Rate Field Sheet is provided in Appendix D.