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Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected septic usage on the Site would be from the existing and any future <br /> residential uses. No construction is planned at this time. Septic system design should <br /> be based on the On-Site Wastewater Disposal Standards (2003) or other engineering <br /> recommendations. <br /> Ground Water Information <br /> Depth and Gradient <br /> Live Oak reviewed ground-water elevation information available from the San Joaquin <br /> County Flood Control and Water Conservation District to determine the ground water <br /> levels near the Site. Data from the spring and fall of 2011 were the most recent <br /> available from this source. According to an analysis of these maps (Plates 5 and 6), <br /> ground water elevation ranges from approximately 35 to 40 feet below mean sea level; <br /> ground water flows down to the southwest at a rate of approximately four to five feet per <br /> mile in the vicinity of the Site. <br /> Given that the ground elevation of the Site is approximately 130 to 155 feet, based on <br /> the County ground water maps the depth to ground water below the Site is estimated to <br /> range between 165 to 195 feet, depending on the season and location on the Site. <br /> Potential Ground Water Contamination Issues <br /> The Soil Suitability Study is not intended to be an investigation into ground-water <br /> contamination sources, and no such investigation was conducted. Many sources can <br /> contribute to ground water contamination, including leaking underground storage tanks, <br /> agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural <br /> activities and the use of septic systems in the area are known ground water <br /> contamination sources with the potential to impact the Site. <br /> Live Oak reviewed the EHD's Water Well Data Table dated March 10, 2009 for nearby <br /> addresses that have been tested for nitrate and dibromochloropropane (DBCP). Three <br /> nearby wells were identified at addresses located within approximately 1.5 miles of the <br /> Site. Only two of the wells were tested for DBCP; it was not detected in either. Nitrate <br /> as NO3 was detected in the wells at concentrations of 3.8 to 11.4 mg/L. The Maximum <br /> Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L; the MCL for <br /> DBCP is 0.2 µg/L. <br /> LOGE 1221 Page 3 <br />