A premier example of aggregate recycling on a large scale is at the site of the former Stapleton Airport in Denver, CO. The project included demolition, removal, and recycling of 1400 acres (5.7 km²) of concrete runways and other paved surfaces, for a total of 6.5 million tons (6 million metric tons) of aggregate (Construction Materials Recycling Association 2010). Figure 1 shows the on-site concrete recycling operations. The aggregate was used throughout the redevelopment of Stapleton for road base, erosion control, and also in new concrete.

The CH2M Hill corporate headquarters in Englewood, Colorado achieves two separate building objectives that are not always compatible; efficient, cost-effective construction and optimal energy performance. CH2M Hill is a leading engineering firm known for its commitment to the environment. In 2003, it was named “Company of the Year” by the Southeast Business Partnership for outstanding community and environmental stewardship.