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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: 1 6 3 E Identified Contamination Source Evaluation The house and Quonset but on the Site date to the 1940s. A trailer house was located at the northwest corner of the Site from 1975 through 1993. (Current and past on-site) The Site was used for agriculture, primarily vineyard, from 1952 or earlier through the present. (Current and past on-site) A domestic well, an irrigation well, and two septic systems (both serve the existing house) are located on the Site. An object that appears to be an old wellhead is located near the northwest corner of the Site. (Current and past on-site) An aboveground storage tank is located behind the Quonset but on the Site. Prof. Shaw indicated that it is empty. (Current on-site) For any current or former structure dating from the 1980s or earlier, the assumption is made that lead - containing materials and/or pesticide residues may be present in and around the structure. The typical standard of care for SSCRs does not require any further investigation of current or former structures. Underground infrastructure may be present in the vicinity of the former house. As with any agricultural property, agricultural chemical residues may be present in Site soils from farming. The typical standard of care for SSCRs does not require any further investigation of past agricultural use. The domestic well, irrigation well, and septic systems are currently in use. No permit records were identified for the possible old wellhead; it is not connected to a pump or power supply. Fuels may have been handled on the Site in the past. While it is possible that residual chemicals may remain in on-site soils, no evidence of impacts to the Site was identified. LOGE 2123 9