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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 fall of 2014 and spring of 2015 were the most recent available from this source (Plates 5 and 6); ground-water levels were not mapped for the vicinity of the Site in the 2015 map. According to an analysis of the 2014 map, ground water elevation is approximately 47 to 50 feet above mean sea level; ground water flows toward the northeast at a rate of approximately six feet per mile in the vicinity of the Site. Given that the ground elevation of the Site is 80 to 90 feet, the depth to water below the Site is estimated to be 30 to 43 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. Live Oak reviewed the EHD's Water Well Data Table dated March 10, 2009 for nearby addresses that have been tested for nitrate and dibromochloropropane (DBCP), common ground-water contaminants in San Joaquin County. Four wells were identified within approximately 2.25 miles of the Site. Nitrate as NO3 was detected in all four wells at concentrations of 13 to 88 mg/L. Three of the wells had been tested for DBCP; it was not detected. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L (equivalent to 10 mg/L nitrate as N); the MCL for DBCP is 0.2 µg/L. On-Site Wells No known wells exist on the Site. No well permits for the Site address were identified from San Joaquin County Environmental Health Department records. Water Sample Because no wells are located on the Site, no water sample was collected. • LOGE 1623 Page 3