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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 /> vineyard and orchard since 1937 or agricultural chemical residues may <br /> earlier. Agricultural chemicals be present in Site soils. The San <br /> continue to be applied to the Site. Joaquin County Agricultural <br /> (Current and past on-site) Commissioner's office regulates <br /> chemical application. <br /> 2. Based on aerial photographs and For any structure dating from the <br /> building permits reviewed, most 1980s or earlier, the assumption is <br /> existing structures on the Site were made that lead-containing materials, <br /> constructed prior to 1980. It asbestos-containing materials, <br /> appears that the bunkhouse on the and/or pesticide residues may be <br /> Site originally dated to 1952 or present in and around the structure. <br /> earlier. The mobile home and These materials should be <br /> smaller shop were originally addressed in accordance with all <br /> constructed around 1973; the applicable regulations. <br /> mobile home has recently been <br /> replaced. The larger shop dates to <br /> 1979. The construction date of the <br /> small office is unknown. (Current <br /> and past on-site) <br /> 3. Three additional structures (a For any former structure built in the <br /> house and two agricultural 1980s or earlier, the assumption is <br /> buildings) dating from 1937 or made that lead-containing materials <br /> earlier were located on the Site in and/or pesticide residues may be <br /> the past. These buildings were present in the vicinity of the former <br /> recently demolished. (Past on-site) structure. These materials should <br /> be addressed in accordance with all <br /> applicable regulations. <br /> LOGE 1504 9 <br />