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27 April 2020 AdvancedGeo Project No. 20-5084 An Employee Owned Company Page 8 of 15 hole is included in Appendix D (EHD form 42-03 revised 11/02/2009). The soil suitability study was conducted within the area of the proposed septic system leach field. 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 four-hour percolation testing period. 6.2. CONSTRUCTION OF PERCOLATION TEST HOLE On 16 April 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 57 inches bsg. The boring was located within the area of the proposed septic system disposal field. 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 coarse sand was added to the borehole. The borehole was then filled with water to a depth of 12 inches above the sand at the time of 0855. 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 17 April 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 17 April 2020, the percolation test hole was dry after sitting overnight. Percolation test procedure #2 was initially 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. However, after less than 30 minutes all the water drained out of the test hole. Therefore, procedure #3 was performed by adding water to approximately six inches above the sand and recording the amount of water remaining in the borehole at 10-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. Measurements were recorded at 10-minute intervals for one hour. 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 D.