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WASTE MANAGEMENT GOALS AND OPPORTUNITIES
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Subsector 237, heavy and civil engineering construction, comprises establishments involved in the construction of engineering projects. Subsector 238, specialty trade contractors, comprises establishments engaged in specialty trade activities generally needed in the construction of all types of buildings. Force account construction is construction work performed by an enterprise primarily engaged in some business other than construction for its own account and use, using employees of the enterprise. This activity is not included in the construction sector unless the construction work performed is the primary activity of a separate establishment of the enterprise. The installation and the ongoing repair and maintenance of telecommunications and utility networks are excluded from construction when the establishments performing the work are not independent contractors. Although a growing proportion of this work is subcontracted to independent contractors in the construction sector, the operating units of telecommunications and utility companies performing this work are included with the telecommunications or utility activities.
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24.2 Waste Management Goals and Opportunities
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The majority of solid waste generated by this sector is stone, wood, and construction and demolition debris. Table 24.1 displays the composition breakdown based on survey results. As shown in the table, the recycling rate for this sector is approximately 21 percent. As derived from the solid waste evaluation model discussed in Chap. 12 the equation that estimates the annual waste generation per year per employee for this sector can be calculated from the following: Tons of solid waste generated per year = 3.54 number of employees + 11.8 Most construction and demolition (C&D) recycling sites accept the following materials:
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Untreated and treated wood Shingles Sheetrock (gypsum/drywall) Plant-mixed asphalt PVC piping Plastic buckets (open) Brick Concrete
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TABLE 24.1 CONSTRUCTION INDUSTRY SOLID WASTE COMPOSITION (SURVEY RESULTS) MATERIAL COMPOSITION (%) RECYCLING (%)
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Stone/C & D composite Wood Paper Mixed of ce paper Newspaper Plastics PVC HDPE LDPE Other Metals Ferrous metals Nonferrous metals OCC (cardboard) Yard waste Food waste Glass Fabrics/textiles Other Overall recycling level
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21 5.5 18 4.7 13 3.4 10 2.7 3 0.8 12 5 4 1 2 3.1 1.4 1.1 0.3 0.5
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0 0.0 34 11.6 4 1.4 4 1.4 4 1.4 25 24 25 24 25 8.5 8.2 8.5 8.2 8.5
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11 2.9 8 2.2 3 0.8 6 1.6 6 1.6 4 1.0 3 0.8 1 0.3 5 NA
89 30.3 89 30.3 90 30.6 14 4.8 0 0.0 0 0.0 24 8.2 0 0.0 0 0.0 21.0
24.3 Economics
In the past, when land ll capacity was readily available and disposal fees were low, recycling or reuse of construction material was not economically feasible. Construction materials were inexpensive compared to the cost of labor; thus construction site job managers were focused on worker productivity rather than material reuse or conservation. In addition, recycling infrastructure and a recycled materials marketplace that processes and resells construction debris did not exist. In recent years, with the increase in international competition for both recycled and raw materials, the economics of recycled materials have improved. During this same time period disposal costs have increased. Recyclable materials have differing market values depending on the presence of local recycling facilities, reprocessing costs, and the availability of virgin materials on the market. In general, it is economically feasible for construction sites to recycle metals, concrete, asphalt, and cardboard. If revenue can not be generated, cost bene ts can still be achieved with reduced disposal or hauling costs.
CONSTRAINTS AND CONSIDERATIONS
24.4 Constraints and Considerations
Construction and demolition activities generate very large quantities of solid waste. The EPA estimates that 136 million tons of construction and demolition waste was generated in 1996. Recycling opportunities are expanding in many communities. Metal, vegetation, concrete, and asphalt recycling have long been available and economically justi ed in most communities. Paper, cardboard, plastics, and clean wood markets vary by regional and local recycling infrastructure. Some materials, such as gypsum wallboard, have recycling opportunities only in communities where reprocessing plants exist or where soil can handle the material as a stabilizing agent. The recyclability of demolished materials is often dependant on the amount of contamination attached to it. Demolished wood, for instance, is often not reusable or recyclable unless it is deconstructed and the nails are removed. Another consideration is that recycling of construction and demolition debris reduces demand for virgin resources, and in turn, reduced the environmental impacts associated with resource extraction, processing, and in many cases transportation. Through effective construction waste management, it is possible to extend the lifetime of existing land lls, avoiding the need for expansion or new land lls sites. The bene ts of a construction and demolition recycling program include
Avoid trash collection and disposal fees To avoid the high cost of disposal, a con-
struction or demolition company can reduce the amount of waste produced during a project by reusing and recycling waste materials. Save resources and money through deconstruction Deconstruction is an expression describing the process of selective dismantling or removal of materials from buildings before or instead of demolition. Reuse and recycling examples include electrical and plumbing xtures that are reused; steel, copper, and lumber that are reused or recycled; wood ooring that is remilled; and doors and windows that are re nished for use in new construction. Also, by donating reusable excess construction and demolition debris, a business not only helps to keep reusable material out of land lls and incinerators, but can also help to reduce costs for future projects. Improve your organization s public image By using fewer resources and reducing the amount of waste sent to land lls and incinerators, a company can enhance its image in the community and with its customers. Make new products from old materials Six major constituents of construction and demolition debris, including concrete, asphalt, metals, and wood, and to a much lesser degree, gypsum wallboard and asphalt shingles, have all been recovered and processed into recycled content products and successfully marketed in the United States. Improve the market for recycled content products Because of the effort being exerted to develop markets for recovered materials, the numbers of construction and demolition facilities are continuing to grow. It was recently estimated by C&D Debris Recycling magazine that there are now more than 3500 construction and demolition debris recycling facilities in operation throughout the United States.
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