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Geosyntec Consultants <br /> Finally, the disposal of C&D debris in an unlined landfill poses a potential risk to <br /> groundwater quality. There is significant evidence in published reports to the presence <br /> of prohibited constituents in C&D debris loads. The two step screening process <br /> employed at the SWDD landfill may not be sufficient to ensure their complete removal <br /> from the waste stream prior to landfilling. Such material could be transported from the <br /> landfill waste by rain water, potentially contaminating groundwater in the absence of a <br /> liner. This was confirmed in several published reports of studies that examined the <br /> quality and characteristics of leachate from landfilled C&D waste. Such leachate was <br /> always found to contain elevated concentration of aluminum, iron, and manganese and, <br /> to a lesser degree, concentrations of arsenic, chromium, copper, and lead. <br /> Based on this study results it can be concluded that the economic advantages of separate <br /> C&D debris disposal in an unlined landfill are not certain while there is a potential risk <br /> to groundwater contamination. It is, therefore, recommended that SWDD discontinue <br /> the separate disposal of C&D debris in an unlined landfill, as soon as practical, and <br /> replace it with co-disposal in a lined Class I landfill commingled with MSW. <br /> JR70184 10 7/ 13/2007 <br />