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01 October 2019 AdvancedGeo AGE Project No. 19-4850 Environmental Page 7 of 14 6.0. PERCOLATION TEST INFORMATION A percolation soil suitability test was performed at the site under EHD permit No. SR0081127 using a four-inch diameter soil boring established to a depth of 42 inches bsg. A site map showing the approximate location of the percolation test hole is illustrated in Figure 2. A precise description of the location and construction of the percolation test hole is included in Appendix C (EHD form 42-03 revised 11/02/2009). The soil suitability study was conducted south of the existing 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 #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 17 September 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 south of the existing 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 0820. 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 18 September 2019, 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 18 September 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