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19 May 2021 <br />Project No. 21-6435 <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 /> <br /> <br />5.1. SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS <br /> <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 /> <br /> <br />5.2. SOIL LITHOLOGY AS RELATED TO FUTURE ONSITE SEPTIC USES <br /> <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 /> <br /> <br />6.0. PERCOLATION TEST INFORMATION <br /> <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 /> <br /> <br />6.1. NUMBER OF PERCOLATION TESTS PERFORMED <br /> <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 /> <br /> <br />6.2. CONSTRUCTION OF PERCOLATION TEST HOLE <br /> <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