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Geosyntec Consultants It is generally recognized that C&D wastes present a lower risk to human health and the environment relative to municipal solid wastes and that they do not merit the same level of control . Nevertheless, land disposal of C&D waste does present a threat of groundwater contamination because of small amounts of hazardous constituents that are sometimes encountered. This report evaluates the desirability of continuing the SWDD practice of separate C&D debris disposal in a dedicated unlined C&D landfill in comparison with codisposing it commingled with MSW in a lined Class I landfill . The principal drawbacks of the codisposal approach are the high capital and the operating and maintenance costs of the Class I landfill in comparison with those of the C&D landfill . These, however, are offset by the improved environmental protection and reduced risks to groundwater contamination that Class I landfills offer in comparison with unlined C&D landfills. 1 .3 Oreanization of Report The remainder of this Landfill Consolidation Study Report is organized as follows : • Section 2 presents the IRC Solid Waste Management Master Plan; • Section 3 presents the regulations and management practices for C&D disposal in Florida and IRC; • Section 4 presents quantity and composition of C&D debris for IRC; • Section 5 presents the potential groundwater hazards of C&D disposal ; • Section 6 presents a cost comparison of separate and co-disposal approaches; and, • Section 7 presents the summary and conclusions of the study. 2. IRC SOLID WASTE MANAGEMENT PLAN The latest update of the Indian River County solid waste management master plan, which was adopted by the SWDD Board on 20 March 2007, specifies four distinct footprints of landfill facilities within the 270 acre landfill site as follows (5) (see Figure 1 ) : JR70184 2 7/ 13/2007