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 purpose of this report is to provide the reader with the ten-year analysis for the cost-benefit of hot mix asphalt projects constructed using the three and five-year warranty specifications developed by CDOT. There were eight projects evaluated using the three-year warranty specifications and two projects evaluated using the five-year warranty specifications. Each warranty project was evaluated with a comparable non-warranty (control) project. Overall, 214.6 lane-miles of warranty projects were constructed and compared to 276.6 lane-miles of control projects.
