Westbound I-70 Twin Tunnels expansion project : documented categorical exclusion.
Colorado Department of Transportation
TRA9/1.2/T92/2014/INTERNEt
Documented categorical exclusion document
APPENDIX A: Environmental Assessment, July 2012:
- Main Report (PDF)
- Appendix A, Summary of Mitigation (PDF)
- Appendix B, Conceptual Design (PDF)
- Appendix C, Context Sensitive Solutions (PDF)
- Appendix D, Aesthetic Guidance (PDF)
- Appendix E, Cumulative Projects (PDF)
- Appendix F, Agency Correspondence (PDF)
- I-70 Chain Station Plan (PDF)
- I-70 Mountain Corridor Mobility and Operations Report (PDF)
- I-70 Reversible Lane Report (PDF)
- Idaho Springs Area of Special Attention Report (PDF)
- Mountain Mineral Belt Aesthetic Guidance (PDF)
- Portal to Portal Companion Report (PDF)
- Tunnel Visioning Report (PDF)
Finding of No Significant Impact, October 2012
Technical Memos:
- Geological Data Report (PDF)
- I-70 Phase I ESA (PDF)
- Air Quality (PDF)
- Energy Resources (PDF)
- Environmental Justice (PDF)
- Historic Properties Survey (PDF)
- Land Use (PDF)
- Noise (PDF)
- Paleontology (PDF)
- Recreational and Section 6(f) Resources (PDF)
- Regulated Materials and Solid Waste (PDF)
- Safety Assessment Report (PDF)
- Terrestrial Wildlife (PDF)
- Transportation (PDF)
- Visual Resources (PDF)
- Water Resources (PDF)
- Wetlands (PDF)
APPENDIX B: Section 4(f) Evaluation with Appendices
Technical Memos:
- Air Quality (PDF)
- Aquatic Fisheries (PDF)
- Cumulative Impacts (PDF)
- Environmental Justice (PDF)
- Floodplains (PDF)
- Hazardous Materials (PDF)
- Historic Properties (PDF)
- Land Use (PDF)
- Noise (PDF)
- Paleontology (PDF)
- Recreation (PDF)
- Socioeconomics (PDF)
- Transportation (PDF)
- Vegetation/Noxious Weeds (PDF)
- Visual Impact (PDF)
- Wetlands (PDF)
- Wildlife (PDF)
APPENDIX C: Categorical Exclusion Determination