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30 July 2019 AdvancedGeo AGE Project No. 19-4772 Environmental Page 6 of 14 percolation test (Appendix C). On 11 July 2019, a 4-inch diameter hand auger was utilized to advance a percolation test hole to 40 inches bsg (P-1); and on 23 July 2019, a 4-inch diameter hand auger was utilized to advance a percolation test hole to 40 inches bsg (P-2). A plan of the specific site features including the percolation test hole locations (i.e., structures, drives, wells, septic systems, large trees, pastures, pools, natural drainage courses, ponds, waterways, etc.) is illustrated in Figure 2. 5.1. SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS The percolation test holes were located in the general area of the proposed septic system leach field. The percolation test holes were advanced to depths of 40 inches bsg using a 4-inch diameter hand auger (Figure 2). 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 from P-1 (11 July 2019) consisted of dry clay over the entire 40 inches of the borehole. However, soil from P-2 (23 July 2019) consisted of dry silty clay from surface grade to approximately 32 inches and damp to slightly moist siltyilty sandy clay from 32 inches to 40 inches bsg. The soil type observed from test hole P-2 is considered semi- permeable and sufficient for liquid waste disposal and treatment. 6.0. PERCOLATION TEST INFORMATION Percolation soil suitability tests were performed at the site under EHD permit No. SR0080803 using four-inch diameter soil borings established to depths of 40 inches bsg. A site map showing the approximate location of the percolation test holes is illustrated in Figure 2. A precise description of the location and construction of the percolation test holes are included in Appendix C (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 Two shallow percolation tests were performed at the site. The appropriate percolation test procedures established by the EHD were followed for the tests (Procedure #1 and #2). The percolation test holes were pre-soaked overnight for 24-hour followed by the appropriate percolation testing period.