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Geosyntec Consultants <br /> r <br /> - Finally, the disposal of C&D debris in an unlined landfill poses a potential risk to groundwater <br /> quality. There is significant evidence from published reports of the potential presence of <br /> prohibited constituents in C&D debris loads. The two step screening process employed at the <br /> ` SWDD facility may not be sufficient to ensure the complete removal of prohibited materials <br /> from the waste stream prior to landfilling. Such material could migrate from the landfilled <br /> - waste by rain water, potentially contaminating groundwater in the absence of a liner. This was <br /> confirmed in several published reports of studies that examined the quality and characteristics <br /> of leachate from landfilled C&D debris. Such leachate was always found to contain elevated <br /> - concentration of aluminum, iron, and manganese and, to a lesser degree, concentrations of <br /> arsenic, chromium, copper, and lead . <br /> r Based on this study results it can be concluded that the economic advantages of separate C&D <br /> debris disposal in an unlined landfill are not certain while there is a potential risk to <br /> r, groundwater contamination. It is, therefore, recommended that SWDD discontinue the separate <br /> disposal of C&D debris in an unlined landfill , as soon as practical, and replace it with co- <br /> disposal in a lined Class I landfill commingled with MSW. <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br /> FL0996-03/J L-70184_08- 10-2007.doc.doc 7-2 2007-08- 10 <br /> r <br /> r <br />