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ug/L. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is <br /> 45 mg/L (10 mg/L-N). The MCL for DBCP is 0.2 ug/L. <br /> On-Site Wells <br /> No wells are currently located on the Site. No well permits were identified for the Site <br /> from among the San Joaquin County Environmental Health Department permit files; the <br /> files are organized by address. <br /> Water Sample <br /> No water sample was collected as part of this investigation. <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 /> Septic systems and dairies have been found to be the most significant sources of nitrate <br /> in ground water. Orchards that require fertilization in sandy soils are also a significant <br /> source of nitrate contamination in shallow or sandy aquifers in San Joaquin County. <br /> The general area consists of orchards, with scattered rural residences along the <br /> roadways. <br /> LOGE 1844 Page 4 <br />