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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 />1 <br />2 <br />i3 <br />0 <br />Identified Contamination Source Evaluation <br />The old barn on the Site dates to <br />the 1950s or earlier. Portions of <br />the main house date to the 1950s, <br />while most of the other structures <br />date to the mid-1980s. Other small <br />structures may have been present <br />on the Site from the 1930s through <br />1970s. The modular home was <br />placed on the Site in 2008. <br />(Current and past on-site) <br />The Site was used for horse <br />breeding from the 1980s through <br />2015. A small dairy operation may <br />have been located on the Site at <br />some point in the past, based on <br />the presence of an old dairy barn. <br />(Past on-site) <br />A portion of the Site was an <br />orchard in 1937, and much of it <br />appeared to be irrigated pasture for <br />many years. (Past on-site) <br />A well and three septic systems <br />(one at each house and one at the <br />horse barn) are located on the Site. <br />(Current on-site) <br />An aboveground diesel storage <br />tank was located on the Site over <br />25 years ago. (Past on-site) <br />For any current or former structure <br />dating from the 1980s or earlier, the <br />assumption is made that lead - <br />containing materials and/or <br />pesticide residues may be present <br />in and around the structure. The <br />typical standard of care for SSCRs <br />does not require any further <br />investigation of current or former <br />structures. <br />Facilities with enclosed livestock <br />have been found to contribute to <br />nitrate contamination in soil and <br />ground water. Based on the map of <br />nitrate detections reviewed, ground- <br />water nitrate levels do not appear to <br />exceed the MCL within one mile of <br />the Site. <br />As with any agricultural property, <br />agricultural chemical residues may <br />be present in Site soils from <br />farming. The typical standard of <br />care for SSCRs does not require <br />any further investigation of past <br />agricultural use. <br />The well and septic systems are <br />currently in use. <br />Fuels were handled on the Site in <br />the past. While it is possible that <br />residual chemicals may remain in <br />on-site soils, no evidence of impacts <br />to the Site was identified. <br />LOGE 2152 9 <br />