This report documents the information required for the I-25 and Arapahoe Road Interchange System Feasibility Study, in compliance with the Colorado Department of Transportation (CDOT) Policy Directive 1601 Interchange Approval Process. This document will be used by CDOT to evaluate the interchange improvements request. Arapahoe Road (SH 88) is located in the southern portion of the Denver Tech Center and serves as a key east-west regional roadway connection. I-25 runs north-south through the study area, extending north through Denver and Fort Collins and south through Colorado Springs. The need for interchange improvements at Arapahoe Road and I-25 has grown substantially since the 1980's.
Following a rigid set of testing protocols, data is being collected on highway traffic noise characteristics along with safety and durability aspects of the associated pavements. This report completes a comprehensive, long-term study to determine if particular pavement surface types and/or textures can be used as quieter pavements, and possibly be used to help satisfy FHWA noise mitigation requirements.
In this study, the Regional Transportation District's (RTD's) light rail operations were examined for pollutant production and runoff. Conclusions from the study: Water leaving ballasted tracks carries only a small fraction of the heavy metals that are introduced into tracks from the light rail operations. Heavy metal concentrations at the most heavily traveled light rail station showed that pollutant concentrations were far below the regulatory limits.
The full closure strategic analysis was conducted to create a decision process whereby full roadway closures for construction and maintenance activities can be evaluated and approved or denied by CDOT Traffic personnel. The study reviewed current full closure practices in Colorado and throughout the country, gathered stakeholder input, and employed an iterative development process to reach a systematic decision tool that can be applied to judging the merits of full closure scenarios. A number of case studies were created to more fully understand the methodology and adjust the tool to best match real-world scenarios. Project deliverables include a technical report and a series of electronic forms that can be used by CDOT to work through the process.
The Colorado Department of Transportation (CDOT) is currently investigating approaches to reduce the frequency and severity of work-related injuries. The incident rates for CDOT are significantly higher than those achieved by some private organizations and comparable DOTs.
A report that evaluates the stability of re-vegetation of high elevation, decomposed, granite cut-slopes by using repeated applications of soil amendments.
A report that explains testing of standard mix designs to determine minimum-required performance levels for developing performance-based concrete mix design criteria.
The Colorado Department of Transportation (CDOT), Department of Transportation Development (DTD) conducted a study to evaluate the usefulness of the Quantm system for planning transportation improvements in Colorado.
Truncated base mechanically stabilized earth walls are the MSE walls with narrow base excavation length and steep excavation slope designed to save construction cost while pushing the technological envelope of geosynthetic reinforcement development. A wall with truncated geometry of a narrow base length and steep excavation slope can significantly increase its base bearing pressure.
The FACWet was developed by surveying existing wetland rapid assessment methodologies and blending the best aspects these approaches with the most recent advances in wetland science.
Section 106 Determinations of Effects I-70 East DEIS Highway Administration (FHWA) and the Colorado Department of Transportation (CDOT). The intent of the EIS is to identify highway improvements along I-70 in the Denver metropolitan area between I-25 and Tower Road and to assess their potential effects on the human and natural environment.
