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21 June 2019 AdvancedGeo AGE Project No. 19-4745 Environmental Page 7 of 14 XV 5.2. SOIL LITHOLOGY AS RELATED TO FUTURE ONSITE SEPTIC USES The soil was visually described in accordance with the Unified Soil Classification System by a representative of AGE under the supervision of a California Professional Geologist. The soil collected from the boring consisted of dry silty clay over the entire 42 inches of the borehole. The soil type Is considered semi-permeable and sufficient for liquid waste disposal and treatment. 6.0. PERCOLATION TEST INFORMATION A percolation soil suitability test was performed at the site under EHD permit No. SR0080721 using one four-inch diameter soil boring established to a depth of 42 inches bsg. A site map showing the approximate location of 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 within 40 feet of the location 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 12 June 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 50 feet of the current septic system location. 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 bore hole. The borehole was then filled with water to a depth of 12 inches above the gravel at the time of 0845. 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 13 June 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 13 June 2019 the percolation test was performed