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• 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 beyond those items <br /> discussion below. Many sources can contribute to ground water contamination, <br /> including leaking underground storage tanks, agricultural activities, dairies, septic <br /> systems, and storm water infiltration. Agricultural activities and the use of septic <br /> systems in the area are known ground water contamination sources with the potential to <br /> impact the Site. <br /> The Site address of 24323 N. Highway 99 is listed on the California State Water <br /> Resources Control Board's GeoTracker website as a closed leaking underground <br /> storage tank case. A 2006 letter from the San Joaquin County Environmental Health <br /> Department "confirms the completion of a site investigation and corrective action" and <br /> indicates that "no further action related to the petroleum release(s) at the site is <br /> required." �� 2 <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- --,, Seven wells were <br /> identified within approximately one mile of th"e. ' itrate as,NO3was detected in all of <br /> the wells at co ato 64.0 mg/lt. Four of the wells had been tested for <br /> DBCP; BCP was detec d. n -of the wells tested was listed at the Site address <br /> • of 24323 rth-Highway-99. This well was not tested for DBCP; nitrate was detected at <br /> 11.6 mg/L-NO3(equivalent to 2.6 mg/L-N). The Maximum Contaminant Level (MCL) set <br /> by the US EPA for nitrate as NO3 is 45 mg/L (equivalent to 10 mg/L-N); the MCL for <br /> DBCP is 0.2 µg/L. <br /> On-Site Wells <br /> A water well is located along the eastern side of the Site (Plate 3). Based on San <br /> Joaquin County Environmental Health Department septic permits reviewed (above), it <br /> appears that an older well is located on the western side of the Site. Mr. Singh <br /> indicated that this older well is used for landscape irrigation only. <br /> One well permit was identified for the Site among the San Joaquin County <br /> Environmental Health Department files: <br /> • March 1972 permit for public water well. Based on the sketch attached, this <br /> permit appears to refer to an off-site location. <br /> This permit has been included in Appendix 4 of this report. <br /> • LOGE 1711 Page 4 <br />