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Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from the proposed winery, the 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 34 feet below mean sea level; ground water flows toward the southwest at a rate of approximately five to six feet per mile in the vicinity of the Site. C2- :y Given that the ground elevation of the Site is 140 to 170 feet, the depth to water below the Site is estimated to be 164 to 204 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, �� 2) 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_ The domestic well on the Site (18909 N. Atkins Road) was tested in 1993; neither nitrate nor DBCP were detected. Five additional tested wells were identified within approximately one-quarter mile of the Site. DBCP was not detected in any of the wells. Nitrate as NO3 was detected in three of the five the wells at concentrations of 6.0 to 9.6 mg/L, it was not detected in the remaining two wells. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L,- the MCL for DBCP is 0.2 µg/L. Based on the records reviewed, it does not appear that nitrate or DBCP contamination of groundwater is an issue in the vicinity of the Site. �` LOGE 1402 Page 3