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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, the septic systems in the area appear to utilize leach lines. 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 future residential uses_ 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. a from spring and fall of 2010 were the most recent available from this sours Accor to an analysis of these maps (Plates 6 and 7), ground water elevations 18 to 32 fe t above mean sea level. Ground water flows down to the east or northea'stat a rate o pproximately four feet per mile in the vicinity of the Site in the spring map; the_fl_ow_ra#e is uncertain in the fall map. Given that the ground elevation of the Site is appy ximately,40 to 55 feet, the depth to water below the Site is estimated to range betwe 14 to 37 feet, epending 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. LOGE 1116 Page 3