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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 />3 <br />M <br />Identified Contamination Source Evaluation <br />Two former structures or objects <br />were identified on the Site in the <br />1937 aerial photograph. (Past on- <br />site) <br />A fence made of recycled creosote - <br />treated railroad ties has been <br />installed along the west side of the <br />Site. (Current off-site) <br />Several drums and other <br />construction materials were <br />observed on the adjacent property <br />to the west. (Current off-site) <br />Six greenhouses or poultry <br />buildings were present on the <br />adjacent parcel to the east in the <br />1990s; two remain, though they do <br />not appear to be in use. Many <br />chicken and rooster pens are <br />present on that property as well. <br />Additional poultry farms are present <br />farther to the east and northwest. <br />(Current and past off-site) <br />For any former structure dating from <br />the 1980s or earlier, the assumption <br />is made that lead -containing <br />materials and/or pesticide residues <br />may be present in the vicinity of the <br />structure. It is also possible that <br />underground infrastructure may <br />remain in the area. The typical <br />standard of care for SSCRs does <br />not require any further investigation <br />of former structures. <br />Recycled creosote -treated railroad <br />ties may contain hazardous <br />chemicals, including the <br />components of the creosote itself <br />and chemicals applied along the <br />tracks for weed/pest prevention. <br />This fence was constructed by the <br />neighbor and is assumed to be on <br />the adjacent property. <br />These materials appear to be part of <br />a current construction project and <br />appear unlikely to present a threat <br />to the subject Site at this time. <br />Facilities with enclosed livestock <br />have been found to contribute to <br />nitrate and other contaminants in <br />soil and ground water. Nurseries <br />may apply fertilizers and chemicals <br />to their crops. Based on the map of <br />nitrate detections reviewed, most <br />ground -water nitrate levels in the <br />area do not exceed the MCL. <br />LOGE 2207 7 <br />