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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 /> Identified Contamination Source Evaluation <br /> 1. Mr. Chitwood has indicated that the For any structure dating from the <br /> structures and former structures on 1980s or earlier, the assumption is <br /> the Site date to approximately 1925 made that lead-containing materials <br /> through 1940. (Current and past and/or pesticide residues may be <br /> on-site) present in and around the structure. <br /> These materials should be <br /> addressed in accordance with all <br /> applicable regulations. <br /> 2. Three septic systems wer a systems were proper <br /> previously operated on the te. destroyed under permit. <br /> (Past on-site) <br /> 3. Marley Cooling Tower Company, Although no samples were collected <br /> 150 N. Sinclair Ave., is located from the immediate vicinity of the <br /> • approximately 0.4 miles north of Site, based on nearby sample <br /> the Site. According to Envirostor, results it appears likely that ground <br /> this facility pressure treated wood water beneath the Site could be <br /> beginning in 1943 with a solution of impacted. <br /> chromium, arsenic, and copper. <br /> The former retention pond has <br /> been capped to prevent further <br /> leaching of these materials to <br /> groundwater. The 2014 2"d Semi- ' KJ'� 6"-X6174: P-4f2 5 <br /> Annual Groundwater Monitoring <br /> Report by Dudek (2015) indicates <br /> that hexavalent chromium and total <br /> dissolved chromium are present in <br /> ground water in a wide area <br /> surrounding this facility. (Current <br /> and past off-site) <br /> • <br /> LOGE 1712 7 <br />