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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 1940 or earlier. agricultural chemical residues may <br /> The Site has been used for be present in Site soils. The San <br /> vineyard, row crops, and grains. Joaquin County Agricultural <br /> Agricultural chemicals continue to Commissioner's office regulates <br /> be applied to the Site. Mr. chemical application. <br /> Dambacher indicated that, in the <br /> past, spray tanks were filled at the <br /> water tank south of the main <br /> house. (Current and past on-site) <br /> 2. Mr. Dambacher indicated that the For any structure dating from the <br /> main house was built in 1947, the 1980s or earlier, the assumption is <br /> secondary house in 1985, the made that pesticide residues may <br /> garage in 1990, and the larger be present in and around the <br /> • shop in 1998 or 1999. He did not structure. The same assumption <br /> know the construction date of the would be made about the former <br /> mobile home but indicated that it location of the mobile home. <br /> was moved to its current location <br /> when the levee was rebuilt in 1993. <br /> (Current and past on-site) <br /> 3. Three domestic wells and three It appears that the existing wells and <br /> septic systems are located on the septic systems are currently in use. <br /> Site. Mr. Dambacher stated that <br /> the mobile home had had a septic <br /> system at its former location; the <br /> system was demolished by the <br /> levee contractors. (Current and <br /> past on-site) <br /> • <br /> LOGE 1521 8 <br />