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ground water elevation is approximately 10 to 13 feet below mean sea level; ground <br /> �.. water flows toward the southeast or east-southeast at a rate of approximately five to S � <br /> 2 I eight feet per mile in the vicinity of the Site. <br /> Given that the ground elevation of the Site is approximately 15 to 18 feet, the depth to <br /> water below the Site is estimated to be 25 to 31 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 /> CZ 2� contribute to ground water contamination, including leaking underground storage tanks, <br /> agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural ( 2, <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), <br /> common ground-water contaminants in San Joaquin County. Three wells were <br /> identified within approximately three-quarters of a mile of the Site. Nitrate as NO3 was <br /> detected in all of the wells at concentrations of 2.6 to 56.4 mg/L. Only two of the wells <br /> had been tested for DBCP; it was detected in both wells at concentrations of 0.88 and <br /> 2.1 LAg/L. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as <br /> NO3 is 45 mg/L; the MCL for DBCP is 0.2 ug/L. It appears that nitrate and DBCP are <br /> 11\\ present at levels in excess of the MCL in some ground water in the area. <br /> On-Site Wells <br /> According to Mr. Phillips, a public well, a domestic well, and an irrigation well serve the <br /> Site (Plate 2). Four well permits were identified for the Site at the San Joaquin County <br /> Environmental Health Department; all the permits identified were for the address of <br /> 4580 West Highway 12: <br /> • January 1977 permit for new irrigation well. <br /> • June 1978 permit new domestic well. <br /> • April 1981 permit for new industrial well. <br /> • November 1993 permit for pump replacement at domestic well. <br /> • August 2006 permit for pump repair at domestic well. <br /> • May 2010 permit for destruction of shallow well (location unclear). <br /> LOGE 1508 Page 4 <br />