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Appendix A <br />Information for Bidders: <br />Preparing Estimates on Recycling <br />I. Estimating the amount of recyclable waste: generation rates <br />one method of estimating the generation of different types of <br />waste is to get average figures of waste generation for different <br />construction materials. The following are estiunates by material: <br />Corrugated cardboard 7.5$ of commercial construction waste <br />(10$ of residential construction <br />waste) <br />is scrap corrugated cardboard. <br />Dimenaional lumber and <br />pallets 18~ of commercial construction waete <br />(25$ of residential construction <br />waste) <br />pallets. <br />is scrap dimensional lwnber and <br />Metals 4.5~ of commercial construction waste <br />(1~ of residential construction <br />waste) <br />is scrap metal. <br />Gypsum wallboard: 1/2 pound per square foot of <br />commercial <br />floor area (1 pound per aquare foot <br />of residential floor area) becomes scrap. <br />Concrete 15$ of commercial conatruction waste <br />{4.5$ of residential construction <br />waste) <br />is scrap concrete. <br />{sources: °A New Methodology for Quantifying Construction Waste„, <br />Peter Yost and John M. Halstead, in sustainable Construction: <br />Proceedings of the First International Conference of CIB TG 16 (1994), <br />university of Florida College of Architecture; Construction Materials <br />Recycling Guidebook -- A Guide to Reducing and Recycling Construction <br />and Remodeling Waste, Metropolitan Council of the Twin Cities Area, <br />1993.) <br />1~nother method is to look at generation rates from similar <br />projects. Several studies have been conducted on the amount of <br />recyclable waste generated on commercial and multi-family residential <br />construction projects: <br />