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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 30 to 36 feet below mean sea level. Ground water appears to flow to the northeast in the area at a rate of 5 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 55 to 61 feet. San Joaquin County experienced its highest recent ground-water levels in 1983 and 1999. Maps of ground-water levels were reviewed for this study (San Joaquin County Flood Control and Water Conservation District, 1983 and 1999); depth to ground water was approximately 50 to 63 feet for these years (Plates 7 and 8). 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 (Plates 9 and 10). According to the nitrate map, two wells within a half-mile radius of the subject Site have been tested for nitrate; nitrate was not detected in either well. According to the DBCP map, two wells within a one- mile radius of the subject Site have been tested for DBCP; DBCP was not detected in either well. On-Site Wells Two wells are located on the Site, one to serve the facility and one to serve the agricultural portion of the Site. It appears from permit records that two additional wells on the Site have been abandoned under permit. Six well permits were identified for the Site from among the files of the San Joaquin County Environmental Health Department: LOGE 20-24 Page 4