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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 2 3 Identified Contamination Source Evaluation The Site has been used for agriculture since 1937 or earlier. A variety of agricultural chemicals have been applied to the Site during the past five years, according to the San Joaquin County Agricultural Commissioner's office. (Current and past on-site) Some of the structures at 22770 South Frederick may date to pre - 1937, based on aerial photos reviewed. Many of the structures at 22844 South Frederick were constructed in the 1970s and 1980s. An old barn was present on the Site until about 28 years ago, and a mobile home was present in the 1990s. (Current and past on- site) Two domestic wells, two irrigation wells, and three septic systems are located on the Site. An older domestic well at 22844 South Frederick and a septic system at a former mobile home were once located on the Site. (Current and past on-site) As with any agricultural property, agricultural chemical residues may be present in Site soils from previous applications. The typical standard of care for SSCRs does not require further investigation of agricultural use. For any structures or former structures dating from the 1980s or earlier, the assumption is made that lead -containing materials and/or pesticide residues may be present in the vicinity of the structures. It is also possible that underground infrastructure may 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. The existing four wells and three septic systems are currently in use. No further information was identified about the former septic system or well. LOGE 2232 12