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Ground Water Information Depth and Gradient Live Oak reviewed ground water elevation information available from the San Joaquin County Flood Control and Water Conservation District to determine the ground water levels near the Site. Data from spring and fall of 2016 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation is approximately 10 to 30 feet below mean sea level. Regional ground water appears to flow to the southwest; the rate could not be calculated because the Site is beyond the mapped area. Given that the ground elevation of the Site is approximately 195 to 304 feet above mean sea level, the depth to water below the Site is estimated to be approximately 205 to 334 feet. Potential Ground Water Contamination Issues The Soil Suitability Study is not intended to be an investigation into ground-water contamination sources, and no such investigation was conducted. Many sources can contribute to ground-water contamination, including leaking underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. There is a low potential for ground-water contamination at the Site due to the lack of development and minimal agriculture in the area. Two common ground-water contaminants in San Joaquin County are nitrate and dibromochloropropane (DBCP). Live Oak reviewed the San Joaquin County Environmental Health Department's maps of Nitrate — Land Use Data and DBCP— Land Use Data dated February 20, 2019 (Plates 7 and 8). According to the nitrate map, three wells within a two-mile radius of the subject Site have been tested for nitrate; nitrate was detected in all three of the wells at a concentration between 0.1 and 5.0 mg/L-N. According to the DBCP map, two wells within a two-mile radius of the Site have been tested for DBCP; no DBCP was detected in either well. LOGE 20-29 Page 3