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• Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected septic usage on the Site would be from the existing homes and <br /> office, potential second unit dwellings on Parcels 1 and 2, and potential future primary i <br /> and second unit dwellings on Parcels 3 and 4. No new construction is planned. <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 fall of 2014 and spring of 2015 were the most recent <br /> available from this source (Plates 6 and 7). According to an analysis of these maps, the <br /> ground-water elevation is approximately 50 to 60 feet below mean sea level; the <br /> ground-water flow is to the west or northwest at a rate of approximately three to four <br /> feet per mile. <br /> Given that the ground elevation of the Site is approximately 75 to 80 feet above sea <br /> level, based on the County ground water maps the depth to ground water below the Site <br /> is estimated to range between 125 to 140 feet. <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 and cattle ranches, septic systems, and storm water <br /> infiltration. Agricultural activities and the use of septic systems in the area are known <br /> ground-water contamination sources with the potential to impact the Site. <br /> Live Oak reviewed the San Joaquin County Environmental Health Department's Water <br /> Well Data Table dated March 10, 2009 for nearby addresses that have been tested for <br /> nitrate and dibromochloropropane (DBCP). One well was identified within <br /> approximately 1.5 miles of the subject Site. DBCP was not detected in the sample; <br /> nitrate was detected at a concentration of 3.01 mg/L-NO3. The Maximum Contaminant <br /> Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L. The MCL for DBCP is 0.2 <br /> tag/L. <br /> • <br /> LOGE 1704 Page 3 <br />