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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, most septic systems in the area utilize leach lines or leach lines and sumps; one permit indicated leach lines and seepage pits. 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 proposed walnut processing facility. 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 2010 and spring of 2011 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation is 60 to 65 feet above mean sea level-, ground water flows toward the north at a rate of four feet per mile or less in the vicinity of the Site. -- � Given that the ground elevation of the Site is approximately 150 feet, the depth to water below the Site is estimated to be 85 to 90 feet, depending on the time of year. 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. On-Site Wells Five water wells e0st on the Site, as depicted on Plate3.A None of the wells are \._ Curren ratier(al. One well repair permit was found Joaquin County Environmental Health Department. The permit, dated January 1977, is for the installation of a new pump at the irrigation well operated by windmill (the easternmost of the five wells). The permit is included in Appendix 4. LOGE 1123 Page 3