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27 April 2020 <br />Project No. 20-5084 <br />Page 7 of 15 <br />4.6. GROUNDWATER ANALYTICAL REPORT <br /> <br />Nitrate as N was detected at 7.7 milligrams per liter (mg/l) and Nitrate as NO3- was <br />detected at 34 mg/l 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 /> <br /> <br />5.0. SOIL PROFILE <br /> <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 /> <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 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 /> <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 />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 /> <br /> <br />6.0. PERCOLATION TEST INFORMATION <br /> <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