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Ground Water Information <br /> Depth and Gradient <br /> Live Oak reviewed ground water elevation information available from the San Joaquin <br /> County Flood Control and Water Conservation District to determine the ground water <br /> levels near the Site. Data from spring and fall of 2016 were the most recent available <br /> from this source. The Site is beyond the mapped area for both years (Plates 5 and 6). <br /> By extrapolating from the nearest mapped elevations, it appears that the ground water <br /> elevation is approximately ten feet below mean sea level. The ground-water gradient <br /> and flow direction could not be determined because the Site is beyond the mapped <br /> area. <br /> Given that the ground elevation of the Site is mean sea level, the depth to water below <br /> the Site is estimated to be 10 feet or less. Ground water depth and flow direction in the <br /> Delta area are highly dependent on seasonal pumping and irrigation. <br /> Potential Ground Water Contamination Issues <br /> The Soil Suitability Study is not intended to be an investigation into ground-water <br /> contamination sources, and no such investigation was conducted. Many sources can <br /> contribute to ground-water contamination, including leaking underground storage tanks, <br /> agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural <br /> activities and the use of septic systems in the area are known ground-water <br /> contamination sources with the potential to impact the Site. <br /> Two common ground-water contaminants in San Joaquin County are nitrate and <br /> dibromochloropropane (DBCP). Live Oak reviewed the San Joaquin County <br /> Environmental Health Department's maps of Nitrate — Land Use Data and DBCP— Land <br /> Use Data dated February 20, 2019 (Plates 7 and 8). According to the nitrate map, two <br /> wells within a 1.5-mile radius of the subject Site have been tested for nitrate; no nitrate <br /> was detected in one, while nitrate was detected at a concentration between 0.1 and 5.0 <br /> mg/L-N in the other. According to the DBCP map, one well within a 1.5-mile radius of <br /> the Site has been tested for DBCP; no DBCP was detected. <br /> San Joaquin County records include a complaint from 2018 regarding an illegal <br /> cannabis grow on the Site. Cannabis cultivation can involve the use of agricultural <br /> chemicals. In this case, no evidence was identified to indicate any environmental <br /> impact to the subject Site. <br /> LOGE 20-36 <br /> Page 3 <br />