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22 December 2020 AdvancedGeo Project No. 20-6228 An Employee-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 #3). The percolation test hole was pre-soaked overnight for 24 hours followed by two (2) one-hour percolation testing periods. 6.2. CONSTRUCTION OF PERCOLATION TEST HOLE On 10 December 2020, 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 borehole. The borehole was then filled with water to a depth of 12 inches above the gravel at the time of 0830. 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 11 December 2020, 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 11 December 2020, the percolation test hole was dry after sitting overnight. 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 after 10- minute intervals for one hour, then at 5-minute intervals for one hour. The water level was measured from a fixed reference point at the surface of the boring using a Solinst water level meter. The final measurement was 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.