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8.0 IDENTIFIED CONTAMINATION SOURCES The following sources of past, current, on-site, and off-site contamination have been identified as a result of this investigation: Identified Contamination Source Evaluation 1. The Site has been used for As with any agricultural property, irrigated pasture from 1937 or agricultural chemical residues may earlier through the 2000s. be present in Site soils from Vineyard was planted on the Site previous applications. The typical around 2002 and 2014. According standard of care for SSCRs does to records reviewed, numerous not require any further investigation agricultural chemicals have been of former agricultural use. The San applied to the Site between 2020 Joaquin County Environmental and the present. Agricultural Health Department provides Hazardous Materials Inventories regulatory oversight for hazardous from 2008, 2009, and 2010 listed materials storage. 550 gallons of gasoline, 10 gallons of 2,4-D, 240 gallons of Roundup, 20 tons of sulfur, and 10,000 gallons of diesel stored on the Site. Mr. Olagaray indicated that agricultural chemicals are stored inside the shop on the Site. Several fertilizer tanks and a spray tank were observed near the structure area on the Site. (Current and past on-site) 2. The structures on the Site date to For any structure or former structure the 1970s. Based on aerial dating from the 1980s or earlier, the photographs reviewed, older assumption is made that lead- building clusters appear to have containing materials and/or been present at two locations in the pesticide residues may be present 1930s, with one structure in the vicinity. It is also possible that remaining through the 1960s. underground infrastructure may (Current and past on-site) remain in the vicinity of former structures. The typical standard of care for SSCRs does not require any further investigation of current or former structures. LOGE 2548 11