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15 November 2019 AdvancedGeo <br /> AGE Project No. 19-4912 Environmental <br /> Page 6 of 14 'Z X <br /> A review of the California Department of Toxics and Substance Control (DTSC) <br /> EnviroStor Database and the Geotracker Web site did not reveal any sites of <br /> environmental concern within a 0.5-mile radius of the site. <br /> 4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> There are no existing water wells at the subject property. <br /> 5.0. SOIL PROFILE <br /> An OWTS Permit was issued for the property by the EHD on 04 November 2019 to <br /> perform a percolation test (Appendix B). On 13 November 2019, a 4-inch diameter hand <br /> auger was utilized to advance a percolation test hole to 42 inches bsg, in the proposed <br /> septic system disposal field area. <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 /> by a representative of AGE under the supervision of a California Professional Geologist. <br /> The soil collected from the percolation test hole boring consisted of dry, fine-grained silty <br /> sand from surface grade to approximately 42 inches bsg; the sand became cemented at <br /> approximately 36 inches bsg. The soil type is considered semi-permeable to permeable <br /> and 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 /> SR0081357 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 />