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wells within a half-mile radius of the subject Site have been tested for nitrate; nitrate <br />was detected in one well at a concentration between 0.1 and 5.0 mg/L-N, and in the <br />other at a concentration between 5.1 and 10.0 mg/L-N. According to the DBCP map, <br />one wells within a one-mile radius of the subject Site has been tested for DBCP; DBCP <br />was detected at a concentration over 0.2 ,tg/L. Farther from the Site, numerous other <br />wells also exhibited DBCP exceedance. <br />On-Site Wells <br />Two wells are located on the Site, one to serve the facility and one to provide <br />emergency fire prevention water. Three well permits were identified for the Site from <br />among the files of the San Joaquin County Environmental Health Department: <br />January 1976 permit for pump replacement at well. <br />November 1993 permit for well destruction. The permit depicts a new well to be <br />constructed 50 feet south of the old well. <br />June 1993 permit for new industrial well. The well was 395 feet deep with a <br />grout seal at 200 feet. <br />These permits have been included in Appendix 4. <br />Water Sample <br />Live Oak collected water samples from the both wells on the Site on August 11, 2020. <br />Each sample was analyzed for nitrate and dibromochloropropane (DBCP) per San <br />Joaquin County Environmental Health Department policy. <br />As required by the laboratory, each sample was collected in a plastic container and two <br />glass vials for nitrate and DBCP analysis, respectively. Trip blanks were also utilized. <br />The samples were placed on ice and transported under chain of custody to FGL <br />Environmental, Stockton. <br />Nitrate was detected in the sample from the main well at a concentration of 2.6 mg/L-N <br />and in the sample from the fire suppression well at a concentration of 3.2 mg/L-N. <br />DBCP was detected in the sample from the main well at a concentration of 0.63 [,tg/L <br />and in the sample from the fire suppression well at a concentration of 0.81 [1g/L. The <br />laboratory analytical results are attached as Appendix 5 of this report. <br />Nitrate is commonly detected in shallow ground water aquifers of the Central Valley. <br />Application of fertilizers, livestock waste, and untreated septic tank waste can all <br />contribute to nitrate in ground water. Nitrate is mobile and tends to accumulate in <br />shallow ground water zones. Based on work in the Sacramento Valley from the early <br />LOGE 20-33 Page 4