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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 2014 and spring of 2015 were the most recent available from this source (Plates 5 and 6). In the 2015 map, the vicinity of the Site has not been mapped. According to an analysis of the 2014 map, the ground-water elevation is approximately 47 to 50 feet above mean sea level; the ground-water flow is to the northeast at a rate of approximately five feet per mile. Given that the ground elevation of the Site is 84 to 94 feet above sea level, based on the County ground water maps the depth to ground water below the Site is estimated to range between 34 to 47 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 and cattle ranches, 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. Live Oak reviewed the San Joaquin County Environmental Health Department's Water Well Data Table dated March 10, 2009 for nearby addresses that have been tested for nitrate and dibromochloropropane (DBCP). Five wells were identified at addresses within approximately one mile of the subject Site. None of the wells had been tested for DBCP. All the wells had been tested for nitrate; it was detected in all of the wells at concentrations of 20 to 135 mg/L-NO3. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L. The MCL for DBCP is 0.2 µg/L. On-Site Wells No wells are currently located on the Site. No well permits were identified for the Site at the San Joaquin County Environmental Health Department. Water Sample Because no wells are located on the Site, no water sample was collected as part of this investigation. • LOGE 1626 Page 3