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contamination. Both cases are listed as "closed" by the State Water Resources Control <br /> Board's GeoTracker website. <br /> Two common ground-water contaminants in San Joaquin County are nitrate and <br /> dibromochloropropane (DBCP). Live Oak reviewed the San Joaquin County <br /> Environmental Health Department's maps of Nitrate — Land Use Data and DBCP— Land <br /> Use Data dated February 20, 2019 (Plates 8 and 9). According to the nitrate map, five <br /> wells within a half-mile radius of the subject Site have been tested for nitrate; it was <br /> detected in two wells at concentrations between 0.1 and 5.0 mg/L-N, in two wells at <br /> concentrations between 5.1 and 10.0 mg/L, and was not detected in the final well. <br /> Three wells within a half-mile radius of the Site were tested for DBCP; no DBCP was <br /> detected in any of the wells. The Maximum Contaminant Level (MCL) set by the US <br /> EPA for nitrate is 10 mg/L-N; the MCL for DBCP is 0.2 ug/L. <br /> On-Site Wells <br /> Two domestic wells are located on the Site. Three permits were identified for the Site <br /> from the San Joaquin County Environmental Health Department septic permit files: <br /> • June 2018 permit for new domestic well. The well was 300 feet deep and had a <br /> grout seal at 200 feet. The soil log indicated strata of clay, sand, and gravel. Ms. <br /> Rosas indicated that this well was drilled incorrectly and produces little water; <br /> she plans to install a hand pump and keep the well as a novelty (personal <br /> communication, June 2, 2020). <br /> • October 2018 permit for replacement domestic well. The well is 200 feet deep <br /> and has a grout seal at 130 feet. A 2018 laboratory report included with the <br /> permit indicates a nitrate concentration of 7.5 mg/L-N at the neighbor's address <br /> of 1801 Piper Place. <br /> • May 2019 permit for new pump at domestic well. <br /> These permits are attached in Appendix 2 of this report. <br /> Water Sample <br /> Live Oak collected a water sample from the main domestic well on the Site on May 18, <br /> 2020. The sample was analyzed for nitrate and dibromochloropropane (DBCP) per San <br /> Joaquin County Environmental Health Department policy. <br /> As required by the laboratory, the 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 sample was placed on ice and transported under chain of custody to FGL <br /> Environmental, Stockton. <br /> LOGE 20-21 Page 4 <br />