A few years ago, standing on this spot would have exposed Mark Wachal to blasts of hot air and loud noises of jets and planes. But today, there's only the muffled sounds of construction delivered by a warm, brisk wind blowing across the prairie.

It's an experience that Wachal has worked hard to enjoy. As president of Recycled Materials Inc., an Arvada, Colo.-based consulting and contracting firm, he has spent the better part of 11 years involved in the planning, setup, and execution of one of the world's largest concrete recycling projects. For that matter, the Stapleton brownfield redevelopment has been recognized as one of the most impressive renewals in the world.