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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 the fall of 2018 and the spring of 2019 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation is approximately 7 to 8 feet below mean sea level. Ground water appears to flow to the south or southeast at a rate of approximately 4 to 7 feet per mile. Given that the ground elevation of the Site is approximately 25 feet above mean sea level, the depth to water below the Site is estimated to be approximately 32 to 33 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. Agricultural activities and the use of septic systems in the area are known ground -water contamination sources with the potential to impact the Site. 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. According to the nitrate map, two wells within a mile of the Site were tested for nitrate (Plate 7). Nitrate was detected in one of the wells at a concentration between 0.1 and 5.0 mg/L-N, and in one of the wells at a concentration over 10 mg/L-N. Within a mile of the Site, two wells were tested for dibromochloropropane (DBCP) (Plate 8). No DBCP was detected in either well. On -Site Wells A domestic well and an irrigation well are located on the Site (Plate 2). No well permits were identified for the Site from among the files of the San Joaquin County Environmental Health Department. LOGE 2124 Page 3