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30 August 2019 AdvancedGeo AGE Project No. 19-4819 Environmental 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-hour followed by a four-hour percolation testing period. 6.2. CONSTRUCTION OF PERCOLATION TEST HOLE On 22 August 2019, 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. 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 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 0850. 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 23 August 2019, the boring was found to be completely dry, intact and in mostly good condition. The borehole partially collapsed approximately six inches overnight. 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 23 August 2019, the percolation test hole was dry after sitting overnight. Percolation test procedure #2 was performed by adding water to approximately six inches above the gravel and recording the amount of water remaining in the borehole at 30-minute intervals for a period of four hours. Additional water was added to the boring after each 30-minute interval as required to ensure that approximately six inches of water remained above the gravel. 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 30-minute intervals for four hours. The final two 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 D. 6.5. COMPLETED PERCOLATION TEST FORM After completion of the successful test, the EHD inspector reviewed the field data and signed the required EHD Percolation Test Rate form. Field measurements recorded