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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 />A dairy was located on the north <br />side of the Site for over 18 years. <br />(Past on-site) <br />Evaluation <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 <br />agricultural use. <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. <br />Underground infrastructure may <br />exist in the vicinity of the former <br />structures. The typical standard of <br />care for SSCRs does not require <br />any further investigation of current <br />or former 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 />Identified Contamination Source <br />The Site has been used for <br />irrigated agriculture since 1952 or <br />earlier. Chemical application <br />records indicate that a variety of <br />chemicals have been applied to the <br />Site from 2017 through 2018, the <br />most recent dates available. A <br />tractor with a plastic tank was <br />observed near the eastern irrigation <br />well on the Site. (Current and past <br />on-site) <br />Based on historical photos <br />reviewed, the existing small house <br />(to be demolished) and former <br />dairy structures on the Site appear <br />to date to 1952 or earlier. The <br />existing pole barn appears to date <br />to the 1950s or early 1960s. <br />(Current and past on-site) <br />LOGE 20-61 10