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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 thesq maps (Plates 5 and 6), ground water elevation is approximate�to 33-feet below mean sea level; ground water flows down to the.west or southwestat a rate of approximately four to eight feet per mile in the vicinity of the Site. Given that the ground elevation of the Site is approximately 125 to 170 feet, based on the County ground water maps the depth to ground water below the Site is estimated to range between 155 to 200 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 Counly. Five "tes ells were identified within approximately two miles of the Site. DB was not detect in any of the Is. Nitrate as NO .was detected in four of the wells at concentrations of 1.88 to 10.0 p rts per millionm), well below the Maximum Contaminant Level (MCL) of 45 pp set by the US EPA for nitrate as NO3- On-Site Wells As indicated on the tentative parcel map, one abandoned irrigation water well exists on the Site (Plate 2). Two permits were on file at the San Joaquin County Environmental Health Department for this well. The first permit, dated July 1976, was for a pump repair to the well. The second permit, dated May 2011, was for destruction of the well. These permits can be found in Appendix 4. Two additional permits were identified for the Site address; these refer to an irrigation well and a domestic well which are not part of the current project Site. LOGE 1104 Page 3