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Septic Permit History in the Vicinity Based on a review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties, most septic systems in the area utilize leach lines only; one system included a 10-foot deep sump. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from the current residents of the Site. Septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) 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. The Site is just beyond the mapped area for both years (Plates 4 and 5). By extrapolating from the nearest mapped elevations, it appears that the ground water elevation is approximately ten feet below mean sea level. The ground-water gradient and flow direction could not be determined because the Site is beyond the mapped area. Given that the ground elevation of the Site is approximately 15 feet above mean sea level, the depth to water below the Site is estimated to be approximately 25 feet. The 1997 domestic well permit for the Site (discussed later in this report) indicates a first water level of 20 feet below ground surface. 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. Two common ground-water contaminants in San Joaquin County are nitrate and dibromochloropropane (DBCP). Live Oak reviewed the San Joaquin County Environmental Health Department's maps of Nitrate — Land Use Data and DBCP— Land LOGE 20-15 Page 3