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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 2010 and spring of 2011 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation ranges from approximately 47 to 62 feet above mean sea level, ground water flows down to the northeast at a rate of approximately 9 to 14 feet per mile in the vicinity of the Site. Given that the ground elevation of the Site is approximately 102 to 112 feet, based on the County ground water maps the depth to ground water below the Site is estimated to range between 40 to 65 feet, depending on the season. 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). Six nearby wells were identified at addresses located within approximately one mile of the Site. Four of the wells had been tested for DBCP; it was not detected in any of the four. Nitrate as NO3 was detected in all six wells at concentrations of 27.0 to 42.2 parts per million (ppm). The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 ppm. On-Site Wells As indicated on the site map (Plate 3), one domestic water well is located on the Site. Two well permits were on file at the San Joaquin County Environmental Health Department for the Site. The first permit, dated September 2007, is for a new domestic well. The second permit, dated February 2010, is for a new pump at the well. The permits can be found in Appendix 4. LOGE 1134 Page 3