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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 five feet below to 50 feet above mean sea level; ground water flows down to the west or southwest at a rate of approximately 35 feet per mile in the vicinity of the Site. Given that the ground elevation of the Site is approximately 190 to 270 feet, based on the County ground water maps the depth to ground water below the Site is estimated to range between 140 to 275 feet, depending on the season and the 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. Five tested wells were identified within approximately 1.5 miles of the Site. DBCP was not detected in any of the wells. Nitrate as NO3 was not detected in one of the wells; in the other four, it was detected at concentrations of 4.0 to 8.9 parts per million (ppm), well below the Maximum Contaminant Level (MCL) of 45 ppm set by the US EPA for nitrate as NO3. On-Site Wells As indicated on the site map (Plate 3), one domestic water well and one irrigation water well exist on the Site. Mr. Eger indicated that a second well located adjacent to the domestic well was sealed with cement prior to his ownership. One well permit was on file at the San Joaquin County Environmental Health Department for the Site. The permit, dated May 2002, is for a new pump at the irrigation well; it can be found in Appendix 4. LOGE 1126 Page 3