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19 May 2021 AdvancedGeo <br /> Project No. 21-6435 An Employee-Owned Company <br /> Page 6 of 14 <br /> A plan of the specific site features including the percolation test hole locations <br /> (i.e., structures, drives, wells, septic systems, large trees, pastures, pools, natural <br /> drainage courses, ponds, waterways, etc.) is illustrated in Figure 2. <br /> 5.1. SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS <br /> The percolation test hole was located directly outside of the disposal field area of the <br /> existing septic system. The percolation test hole was advanced to a depth of 42 inches <br /> bsg using a four-inch diameter hand auger (Figure 2). <br /> 5.2. SOIL LITHOLOGY AS RELATED TO FUTURE ONSITE SEPTIC USES <br /> The soil was visually described in accordance with the Unified Soil Classification System <br /> (USCS) by a representative of AGI under the supervision of a California Professional <br /> Geologist. The soil collected from the percolation test hole boring consisted of silty sands <br /> from surface grade to approximately 42 inches bsg. The soil type is considered semi- <br /> permeable and should be sufficient for liquid waste disposal and treatment. <br /> 6.0. PERCOLATION TEST INFORMATION <br /> A percolation soil suitability test was performed at the site under EHD permit No. <br /> SR0083650 using a four-inch diameter soil boring established to a depth of 42 inches <br /> bsg. A site map showing the approximate location of the percolation test hole is illustrated <br /> in Figure 2. A precise description of the location and construction of the percolation test <br /> hole is included in Appendix B (EHD form 42-03 revised 11/02/2009). The soil suitability <br /> study was conducted within the general area of the septic system leach field. <br /> 6.1. NUMBER OF PERCOLATION TESTS PERFORMED <br /> One shallow percolation test was performed at the site. The appropriate percolation test <br /> procedure established by the EHD was followed for the test (Procedure #3). The <br /> percolation test hole was pre-soaked overnight for 24 hours followed by a one-hour <br /> percolation testing period. <br /> 6.2. CONSTRUCTION OF PERCOLATION TEST HOLE <br /> On 13 May 2021, one boring was advanced for a shallow percolation test. The boring was <br /> advanced using a four-inch diameter hand auger to a depth of 42 inches bsg. Following <br /> borehole advancement, the sides of the boring were scraped, and loose material was <br /> removed from the borehole. Once the borehole was cleared of loose material, two inches <br /> of fine gravel was added to the bottom of the borehole and a two-inch diameter polyvinyl <br />