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20 January 2021 <br />Project No. 20-6284 <br />Page 7 of 14 <br />5.1. SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS <br /> <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 /> <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 working under the supervision of a California <br />Professional Geologist. The soil collected from the percolation test hole boring consisted <br />of dry, clay with sand from surface grade to approximately 24 inches bsg, silty sand from <br />24 to 36 inches bsg, and sand with silt from 36 to 42 inches bsg. The soil type is <br />considered semi-permeable and should be sufficient for liquid waste disposal and <br />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 />SR0083092 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 /> <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 30-minute <br />percolation testing period. <br /> <br /> <br />6.2. CONSTRUCTION OF PERCOLATION TEST HOLE <br /> <br />On 14 January 2021, 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 />filled with water to a depth of 12 inches above the gravel at the time of 0840. The test <br />hole was then covered for 24 hours to allow for complete saturation of the borehole.