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• area utilize leach lines with seepage pits or leach lines with sumps; one permit indicated a system with only leach lines. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected septic usage on the Site would be from the existing home and apartment above the barn. 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 2014 and spring of 2015 were the most recent available from this source (Plates 5 and 6). According to an analysis of these maps, the ground-water elevation is approximately 25 to 27 feet below mean sea level; the ground-water flow is to the northwest at a rate of approximately six feet per mile. Given that the ground elevation of the Site is approximately 95 to 98 feet above sea level, based on the County ground water maps the depth to ground water below the Site is estimated to range between 120 to 125 feet. • 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 and cattle ranches, 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 San Joaquin County Environmental Health Department's Water Well Data Table dated March 10, 2009 for nearby addresses that have been tested for nitrate and dibromochloropropane (DBCP). Six wells were identified at addresses within approximately 1.5 miles of the subject Site. All of the wells had been tested for DBCP; it was detected in only one well, at a concentration of 0.1 µg/L. All the wells had been tested for nitrate; it was detected at concentrations of 5.5 to 17.9 mg/L- NO3. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L (equivalent to 10 mg/L-N). The MCL for DBCP is 0.2 µg/L. • LOGE 1710 Page 3