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23 October 2020 AdvancedGeo <br /> An EmployerOwned Company <br /> Project No. 20-6169 <br /> Page 7 of 15 <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 in the disposal field area of the proposed septic <br /> system. The percolation test hole was advanced to a depth of 42 inches bsg using a four- <br /> 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 dry, sandy <br /> silt from surface grade to 42 inches bsg. The soil type is considered semi-permeable and <br /> 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 /> SR0082684 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 D (EHD form 42-03 revised 11/02/2009). The soil suitability <br /> study was conducted within the area of the proposed 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 15 October 2020, one boring was advanced for a shallow percolation test. The boring <br /> was advanced using a four-inch diameter hand auger to a depth of 42 inches bsg. <br /> Following borehole advancement, the sides of the boring were scraped, and loose <br /> material was removed from the borehole. Once the borehole was cleared of loose <br /> material, two inches of fine gravel was added to the borehole. The borehole was then <br />