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• The general area consists of orchards, vineyards, open agricultural land, and rural residences. 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 or leach lines with seepage pits; one permit indicated that a filter bed would be installed, and one indicated only leach lines. 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 residents of the main house and caretaker's house, as well as the employees and customers of the stables. 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. According to an analysis of these maps (Plates 5 and 6), ground water elevation is approximately 27 to 35 feet below mean sea level; ground water flows predominantly toward the northeast at a rate of approximately three to five feet per mile in the vicinity of the Site. Given that the ground elevation of the Site is approximately 70 to 75 feet, the depth to water below the Site is estimated to be 97 to 110 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. • LOGE 1820 Page 3