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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 spring and fall of 2011 were the most recent available from this source (Plates 5 and 6). The Site lies just beyond the area of known ground-water contours on these maps. Based on the closest contours, it appears that the ground water elevation is approximately 25 to 35 feet below mean sea level at the Site. The spring map depicts ground water flowing down to the west in the vicinity of the Site at a rate of approximately nine feet per mile; the gradient could not be calculated for the fall map. Iq Given that the ground elevation of the Site ranges from approximately 150 to 190 feet above mean sea level, the depth to water below the Site is estimated to be between 175 to 225 feet, depending on the season and location on the Site. 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. Two tested wells were identified within approximately one mile of the Site. DBCP was not detected in either of the wells. Nitrate as NO3 was detected in the wells at concentrations of 1.6 and 11 .0 mg/L, well below the Maximum Contaminant Level (MCL) of 45 mg/L set by the US EPA for nitrate as NO3. On-Site Wells Two irrigation wells are located on the Site. One well permit for the Site was identified at the San Joaquin County Environmental Health Department. The permit, dated October 1973, was for a new irrigation well. Though the address listed on the permit was 22201 East Frazier Road, the well location was drawn between Tully and Clements Roads. Consequently, the permit does not appear to refer to the subject Site. LOGE 1217 Page 3