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Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from any residents of the houses (currently unoccupied), the tasting room employee, and future customers at the tasting room. 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 2016 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation is approximately 17 to 32 feet below mean sea level; ground water flows toward the northeast at a rate of approximately five to 13 feet per mile in the vicinity of the Site. Given that the ground elevation of the Site is approximately 85 to 90 feet, the depth to water below the Site is estimated to be 102 to 122 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 Wafer Wel! 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. Based on this database it appears that the domestic well on the subject Site was tested in March of 2006; nitrate as NO3 was detected in the sample at 2.0 mg/L, and DBCP was not detected. Five additional wells were identified within approximately one mile of the Site. All but one of the wells had been tested for nitrate. Nitrate as NO3 was detected in all four wells tested, at concentrations of 0.5, 8.0, 26.1, and 50.8 mg/L. All of the wells had been tested for DBCP; it was detected in only one well, at a concentration of 0.17 ug/L. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L (10 mg/L-N); the MCL for DBCP is 0.2 ug/L. LOGE 1729 Page 3