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• appears that two nearby wells have been exhibiting levels of nitrate in excess of the <br /> regulatory threshold. <br /> On-Site Wells <br /> No wells are currently located on the Site. <br /> No well permits were identified for the Site from among the San Joaquin County <br /> Environmental Health Department permit files. <br /> Water Sample <br /> Because no wells are located on the Site, no water sample was collected. <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 agricultural land, orchards, and single-family residences. <br /> A dairy is located approximately 500 feet to the west of the Site, and a poultry ranch is <br /> located approximately 1,000 feet to the southwest. <br /> • LOGE 1802 Page 4 <br />