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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 5 �> utilize leach lines, leach lines and sumps, or 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 septic usage on the Site would be from the existing and any future residential uses. No construction is planned at this time. Septic system design should (�j•�' 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 spring and fall of 2012 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation ranges from approximately 70 to 115 feet above mean sea level: ground water flows down to the west at a rate of approximately 65 to 70 per mile in the vicinity of the Site Given that the ground elevation of the Site is approximately 160 to 322 feet, based on the County ground water maps the depth to ground water below the Site is estimated to range between 45 to 252 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, 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. Live Oak reviewed the EHD's Water Well Data Table dated March 10, 2009 for nearby addresses that have been tested for nitrate and dibromochloropropane (DBCP). The Site address of 21411 North Cord Road had been tested on February 17, 2000. Nitrate was detected in the sample at 12.4 mg/L; DBCP was not detected. One nearby well was identified within approximately one-half to three-quarters of a mile of the Site. DBCP was not detected in the sample, it was not tested for nitrate. The Maximum LOGE 1323 Page 3