Past & Current Projects
Back to List of ProjectsInterstate-25 Valley Highway EIS-Water Quality and Stormwater Management
The Valley Highway is the name for Interstate 25 (I-25) in Central Denver from the US 6 interchange south to US 85 Santa Fe Drive interchange. The Valley Highway EIS was the first CDOT NEPA project that was required to address the new CDOT Municipal Separate Storm Sewer System (MS4) permit regulations. The project involved identifying stormwater management practices to avoid and/or reduce potential water quality impacts to the South Platte River from I-25 system operations.
Water quality impacts from I-25 stormwater discharges required the identification and implementation of best management practices that were recognized by the Colorado Department of Transportation and the Colorado Department of Public Health and Environment. Deicing agents, sediment accumulation and heavy metal deposition on highway surfaces were identified as being pollutants of concern in stormwater discharges. Construction activities near the South Platte River had a high potential of impacting water quality during storm events; therefore, erosion control best management practices were identified as part of the CDOT MS4 program requirements.
Post construction best management practices focused on structural pond systems to collect and treat stormwater before it entered the South Platte River. The CDOT storm water conveyance system was complex, which included discharges from the City and County of Denver storm system. There was limited amount of right of way to construct and maintain structural best management practices and as a result innovative approaches were used such as over sizing structural pond systems to compensate for areas in which stormwater could not be collected and treated along I-25. Non structural best management practices were identified such as road maintenance sweeping, employee training and public water quality awareness.
Project Date: 2003
CDOT Contact/Reference: Tony Gross- CDOT Region 6 and Tom Boyce EPB
TerraLogic Sustainable Solutions
5766 Flagstaff Road, Boulder, Colorado 80302
303-786-9111 office | 720-351-8945 cell Info@TerraLogicSS.com
Among his strengths is the ability to effectively communicate with diverse stakeholders throughout the project’s condensed design and construction schedule.
As a client, I appreciate his ability to anticipate issues and to take initiative towards finding a resolution in the best interest of the project.
His input has helped the 120th Connection project maintain costs and schedule while at the same time, furthering the agency’s commitment to environmental quality.
David Singer, Senior Environmental Project Manager
Colorado Department of Transportation Region 6
©2012 TerraLogic - Sustainable Solutions
