GEO-velopment: The Role of Geological and Geotechnical Engineering in New and Redevelopment Projects is a collection of papers presented at the 2008 Biennial Geotechnical Seminar held in Denver, Colorado, November 7, 2008. This one-day seminar was organized by the Geotechnical Group of the ASCE-Colorado Section, the Association of Environmental and Engineering Geologists-Rocky Mountain Section, and the Colorado Association of Geotechnical Engineers. From downtown Denver to the beet plants of eastern Colorado, from the sprawling Front Range suburbs to the Rocky Mountain High Country, these papers seek to solve complex geotechnical and environmental challenges. The topics include: downtown redevelopment; construction on sugar beet waste and expansive soils; dam remediation including spillways and sinkholes; soil-cement uplift pressures; internal erosion in dams; ancient Mesa Verde reservoir embankments; Brownfield redevelopment; research in soil moisture retention curves and intrinsic dampening; retaining walls including asset management; and airport runway upgrade. This proceedings will be valuable to anyone in geotechnical engineering, especially those working in Colorado or similar geologic settings.