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8.0 IDENTIFIED CONTAMINATION SOURCES <br /> The following sources of past, current, on-site, and off-site contamination have <br /> been identified as a result of this investigation: <br /> Identified Contamination Source Evaluation <br /> 1. The Site has been used for As with any agricultural property, <br /> agriculture since the 1940s. A agricultural chemical residues may <br /> variety of agricultural chemicals be present in Site soils from <br /> have been applied to the Site in the previous applications. The typical <br /> recent past, according to the San standard of care for SSCRs does <br /> Joaquin County Agricultural not require further investigation of <br /> Commissioner's office. (Current agricultural use. <br /> and past on-site) <br /> 2. The Site has been used as a dairy Dairies are known sources of nitrate <br /> since the 1940s. The unlined and other chemicals to soil and <br /> manure pond has been present ground water. Waste discharge <br /> since the 1960s. The dairy is associated with the dairy falls under <br /> subject to Waste Discharge the regulatory oversight of the Water <br /> Requirements issued by the Water Board. <br /> Board. A recordkeeping violation is <br /> on file. (Current and past on-site) <br /> 3. Four houses and two dairy For any structures dating from the <br /> buildings appear to have been 1980s or earlier, the assumption is <br /> present on the Site since the made that lead-containing materials <br /> 1940s. The old storage building and/or pesticide residues may be <br /> was reportedly moved to the Site in present in the vicinity of the <br /> the 1960s. The three mobile structures. The typical standard of <br /> homes on the Site also appear care for SSCRs does not require <br /> relatively old. (Current and past any further investigation of <br /> on-site) structures. <br /> 4. Three domestic wells and four The wells appear to be in service. <br /> irrigation wells are located on the The San Joaquin County <br /> Site. (Current on-site) Environmental Health Department <br /> provides regulatory oversight for <br /> wells and septic systems. <br /> LOGE 2327 12 <br />