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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. Based on review of aerial For any current or former structure <br /> photographs, it appears that a dating from the 1980s or earlier, the <br /> number of structures existed on the assumption is made that lead- <br /> Site in the past. The existing containing materials and/or <br /> structures on the Site date to the pesticide residues may be present <br /> 1930s or earlier through the 2000s. in and around the structure. <br /> It appears that several additional Underground infrastructure may <br /> structures have been removed from exist in the vicinity of the former <br /> the Site as well. (Current and past structures. The typical standard of <br /> on-site) care for SSCRs does not require <br /> any further investigation of current <br /> or former structures. <br /> 2. The Site has been used for dry As with any former agricultural <br /> pasture since 1937 or earlier, and property, agricultural chemical <br /> for a mix of dry and irrigated residues may be present in Site <br /> pasture since 1952. A portion of soils from past farming. The typical <br /> the Site was used for vineyard in standard of care for SSCRs does <br /> 1937 or earlier. No chemical not require any further investigation <br /> application records for the Site of past agricultural use. <br /> were identified at the San Joaquin <br /> County Agricultural <br /> Commissioner's office for the past <br /> five years. (Past on-site) / <br /> w <br /> 3. A domestic well and an irrigation The domestic and irrigation wells p.e��f�, <br /> well are currently in use on the appear to be in working order. The <br /> 1J � <br /> Site. An older well, located near older well is capped and most likely <br /> the main house, is capped and not could be returned to service in the <br /> currently in use. (Current and past future, if needed. <br /> on-site) <br /> 4. Two above-ground storage tanks No staining was observed in the <br /> were observed near the shop vicinity of the tanks. <br /> building on the Site. One tank was <br /> labeled as containing red diesel. <br /> (Current on-site) <br /> LOGE 1940 8 <br />