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<br /> Comprehensive Review of <br /> S olid W aste Collection and Disposal Options <br /> <br /> <br />v2.1 147 10/22/12 <br />during that period. The projected population changes for the Town between now and 2035 are <br />presented in Exhibit 11-1. <br /> <br />Exhibit 11 -1. Population Projections, Town of Chapel Hill <br />Year <br />Population <br />Estimates <br />% Change <br />Per Year* <br />2000 48,715 <br />2010 57,233 <br />2015 65,748 2.98% <br />2025 77,767 2.39% <br />2035 80,483 1.62% <br /> <br />Source: See Section 2.1.4.1 <br />*Based on 2010 <br /> <br />The disposal rates were projected based on a 1.62% per year increase for both the Town-only <br />and the regional landfill options. A further refinement on the regional population growth trends <br />could be considered, but for the purpose of this evaluation, the same growth rate was used for the <br />Town and Region. The yearly projected MSW disposal quantities for a Town-only and regional <br />landfill are presented in Exhibit 11-2. This exhibit does not include solid waste program changes <br />that could ultimately reduce the quantity of MSW requiring disposal in a landfill; therefore, the <br />estimated disposal rates presented are conservative. <br /> <br />The hypothetical landfill dimensions and disposal capacities presented in Exhibit 11-3 are based <br />on a number of assumptions regarding the allowable maximum slopes (33%), benching, <br />maximum fill height, top deck configuration, and setbacks to property line from the landfill <br />footprint. A setback of 1,000 feet from the landfill waste footprint was assumed to provide for <br />visual buffers, regulatory setback, ancillary facilities (stormwater, maintenance, leachate storage, <br />fueling, and other solid waste facilities), and borrow areas. <br /> <br />Obviously with larger landfill footprints, higher fill heights could be achieved than shown in the <br />exhibit. Constructing a landfill to higher fill heights would provide for more disposal capacity <br />than shown in the exhibit. However, for the relatively small landfill footprints for both the <br />Town-only and regional landfill scenarios, a maximum elevation of 100 feet above grade was <br />selected. The net volume shown in the exhibit represents the total calculated airspace volume <br />minus the estimated volume for a 3-foot-thick final cover system. For the purposes of this <br />evaluation, Exhibit 11-4 summarizes the landfill footprint and total land areas that would be <br />required for a Town-only and regional landfill to provide disposal capacity for the next 30 years. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />