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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 10 and 11). According to the nitrate map, <br /> ten wells within a half-mile radius of the subject Site have been tested for nitrate; it was <br /> detected in seven wells at concentrations between 0.1 and 5.0 mg/L-N, and was <br /> detected at concentrations between 5.1 and 10.0 mg/L in the other three wells. Ten <br /> wells within a half-mile radius of the Site were tested for DBCP; no DBCP was detected <br /> in any of the wells. The Maximum Contaminant Level (MCL) set by the US EPA for <br /> nitrate is 10 mg/L-N; the MCL for DBCP is 0.2 ug/L. <br /> On-Site Wells <br /> No wells are located on the Site. No well permits were identified for the Site from the <br /> San Joaquin County Environmental Health Department septic permit files. <br /> Water Sample <br /> Because there are currently no wells on the Site, no water sample was collected for this <br /> study. <br /> Sources of Nitrate to Groundwater <br /> Off-Site Sources of Nitrate <br /> Many sources can contribute to ground water nitrate contamination, including <br /> agricultural activities, dairies and cattle ranches, septic systems, and storm water <br /> infiltration. <br /> Dairies, orchards that require fertilization in sandy soils, and septic systems have been <br /> found to be the most significant sources of nitrate in ground water. <br /> The general area consists of agricultural land and rural residences. <br /> LOGE 1918 Page 4 <br />