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Septic Permit History in the Vicinity Based on a recent review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties, it appears that the septic systems in the area utilize leach lines with seepage pits. 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 systems and any future residential uses. No construction is planned at this time. However, County regulations would allow the placement of primary and secondary residences on Parcels 1, 3, 5, and 6 through 15 at some point in the future, and placement of secondary residences on Parcels 2 and 4. 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 the fall of 2013 and spring of 2014 were the most recent available from this source. According to an analysis of these maps (Plates 6 and 7), ground water elevation ranges from approximately five to 35 feet below mean sea level; ground water flows down to the west in the vicinity of the Site at a rate of approximately 10 feet per mile. Given that the ground elevation of the Site is approximately 103 to 220 feet, based on the County ground water maps the depth to ground water below the Site is estimated to range between 138 to 240 feet, depending on the 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, agricultural activities, dairies and cattle ranches, septic systems, and storm water C 2) 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). Five wells were tested at addresses within approximately 1.5 miles of the subject Site. Nitrate was detected in the wells at concentrations ranging from 1.88 to 8.8 mg/L. DBCP was not detected in the wells. LOGE 1419 Page 3