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r Geosyntec Consultants M 4. QUANTITY AND COMPOSITION OF C&D DEBRIS Unlike MSW generation which varies directly with the County population, C&D debris generation depends also on the rate of growth of the County. More C &D debris is generated per capita during periods of high growth than when the growth is low. Figure 3 shows the monthly quantities of MSW and C&D debris delivered for disposal at the IRCL facility during the period April 2006 through March 2007 based on SWDD ' s disposal records. This period was selected to demonstrate the impact of the slow down of construction in the County on the r generation of the two types of waste. It can be seen that MSW generation rate is fairly stable with the exception of the winter effect caused by the transient nature of the County' s population. More MSW is generated during the winter months than in the summer period . The C&D debris generation rate, however, shows a clear decline over the period under consideration because of the steep decline in construction activity in the County. r As previously defined in Section 3 . 1 , C&D debris includes concrete, asphalt (pavement and shingles), wood, gypsum drywall , and metal . These are primary construction materials. Mixed r C&D debris also includes smaller amounts of other materials, such as packaging (paper, plastic, and cardboards), carpet scraps, and insulation. While not in the strict regulatory definition of C&D debris, materials, such as unauthorized dumping of MSW and small quantities of hazardous waste (e. g. lead flashings, fluorescent lamps) by workers and nearby households into C&D debris dedicated roll-off containers are also present in C&D debris . r C&D debris is generated from many sources and the waste stream varies as a function of these sources (e. g. building construction vs. road construction, construction vs. demolition, r residential construction vs . commercial construction) . A 2003 report of the Florida Center for Solid and Hazardous Waste Management describes a detailed study to characterize Florida' s C&D debris stream [Townsend„ 2004] . Table 1 summarizes the results of this study. Materials categorized as other include: paper, plastic, MSW, carpet, insulation, buckets, vegetative material and dirt. Table 2 presents a list of materials observed in mixed C &D debris . Demolition debris, in particular, is known to contain hazardous constituents. Materials that may result in possible risk to human health and the environmental often found in demolition debris include lamps, thermostats, and light switches containing mercury-, batteries from exit signs, emergency lights, and smoke alarms that may contain lead and a radiological component-, lighting ballasts which contain polychlorinated biphenyls (PCBs) ; and lead pipes and roof vent flashings [Townsend et al . , 1998 and 2000] . r FLO996-03/7L70184_08- 10-2007.doc.doc 4- 1 2007-08-10