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07 Septmber 2021 <br />Project No. 21-6531 <br />Page 6 of 14 <br />4.5. GROUNDWATER SAMPLE COLLECTION <br /> <br />On 23 August 2021, a sample of the drinking water provided by the current groundwater <br />supply well at 20157 Little John, Stockton, California was collected in an unpreserved 0.5- <br />liter plastic container and two volatile organic analysis (VOAs) vials. The groundwater <br />sample containers were properly labeled, placed in a chilled container, and transported <br />under chain-of-custody protocols to McCampbell Analytical, Inc. (MAI), a California <br />Environmental Laboratory Accreditation Program (ELAP)-certified laboratory. The sample <br />was analyzed for Nitrate as Nitrogen (N), Nitrate as NO3 -, and DBCP. <br /> <br /> <br />4.6. GROUNDWATER ANALYTICAL REPORT <br /> <br />Nitrate as N was detected at 7.2 milligrams per liter (mg/l), Nitrate as NO3 - was detected <br />at 32 mg/l, and DBCP was detected at 0.27 micrograms per liter (µg/l) in the water sample <br />collected from the domestic water supply well. The MAI laboratory report (Work Order: <br />2108C39) with quality assurance/quality control (QA/QC) reports and chain-of-custody <br />form are provided in Appendix B. <br /> <br /> <br />5.0. SOIL PROFILE <br /> <br />An OWTS Permit was issued for the property by the EHD on 10 August 2021 to perform <br />a percolation test (Appendix C). On 23 August 2021, a 4-inch diameter hand auger was <br />utilized to advance a percolation test hole to 42 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 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 under the supervision of a California Professional <br />Geologist. The soil collected from the percolation test hole boring consisted of dry silts <br />from surface grade to approximately 24 inches and sandy silts from 24 inches to 42 inches <br />bsg. The soil type is considered semi-permeable and should be sufficient for liquid waste <br />disposal and treatment.