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27 April 2020 AdvancedGeo <br /> Project No. 20-5084 An Employee Owned Cornpany <br /> Page 7 of 15 <br /> 4.6. GROUNDWATER ANALYTICAL REPORT <br /> Nitrate as N was detected at 7.7 milligrams per liter (mg/1) and Nitrate as NO3- was <br /> detected at 34 mg/I in the water sample. The MAI laboratory report (Work Order: 2004769) <br /> with quality assurance/quality control (QA/QC) reports and chain-of-custody form are <br /> provided in Appendix C. <br /> 5.0. SOIL PROFILE <br /> An OWTS Permit was issued for the property by the EHD on 09 April 2020 to perform a <br /> percolation test (Appendix D). On 16 April 2020, a 4-inch diameter hand auger was <br /> utilized to advance a percolation test hole to 57 inches bsg in the proposed septic system <br /> 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 57 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 AGI under the supervision of a California Professional Geologist. <br /> The soil collected from the percolation test hole boring consisted of dry, fine-grained <br /> sandy silt from surface grade to approximately 30 inches bsg; silty fine-grained sand from <br /> approximately 30 inches to 42 inches bsg; and silty sand with gravel from 42 inches to <br /> the total depth of 57 inches. 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 <br /> No. SR0081968 using a four-inch diameter soil boring established to a depth of 57 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 />