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• Expected On-Site Maximum Septic Tank Usage Maximum expected septic usage on the Site would be from the proposed house on each parcel, as well as from a potential second unit dwelling on each parcel. 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 spring and fall of 2016 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 0 to 20 feet above mean sea level; the ground- water flow is to the northwest at a rate of approximately 17 to 20 feet per mile. Given that the ground elevation of the Site is approximately 110 to 120 feet above sea level, based on the County ground-water maps the depth to ground water below the Site is estimated to range between 90 to 120 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 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). Two wells were identified at addresses within approximately one mile of the subject Site. One of the wells had been tested for DBCP; it was not detected. Both of the wells had been tested for nitrate; it was detected at concentrations of 45 and 45.1 mg/L-NO3 (10 mg/L-N). 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. On-Site Wells No wells are located on the Site. No well permits were identified for the Site address at the San Joaquin County Environmental Health Department. Water Sample • No water sample was collected for this investigation. LOGE 1825 Page 3