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Expected On-Site Maximum Septic Tank Usage �►tJLS Maximum expected usage on the Site would be from the proposed winery structures, jthe existing residence, and a potential additional dwelling unit. Septic system design should be based on the On-Site Wastewater Disposal Standards (2003) or other engineering recommendations. 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 spring and fall of 2011 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation is approximately 24 to 30 feet,below mean sea level; ground water flows S�5 toward the south or south-southeast at a rate of approximately eight to 14 feet per mile \ in the vicinity of the Site. �� \ '2 / Given that the ground elevation of the Site is 66 to 67 feet, the depth to water below the J Site is estimated to be 90 to 97 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, l2 2\ agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural C� l / 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 q4iroxmiqately one mile of the Site. DBCP was detected in the wells at concentrations 0.58 nd 2.2 µg/L. Nitrate as NO3 was detected in the wells at �> concentrations of 15.0 and 19.0 mg/L. The Maximum ConLevel (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L; the MCL for P is 0.2 /L. Based on the records reviewed, it does not appear that ground wat nitrate in the vicinity exceed the MCL. Groundwater in the vicinity may contain DBCP in excess of the MCL. ` � LOGE 1301 Page 3