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I-70 Second Tier Environmental Studies SIU #7

I-70 Second Tier Environmental Studies SIU #7. Presentation to TEAM September 16, 2004. Seven Independent Studies 2nd Tier. 7 Sections of Independent Utility. SIU #7 2nd Tier. Route 19 (MP 174) to Lake St. Louis Blvd (MP 214)

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I-70 Second Tier Environmental Studies SIU #7

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  1. I-70 Second Tier Environmental StudiesSIU #7 Presentation to TEAM September 16, 2004

  2. Seven Independent Studies 2nd Tier 7 Sections of Independent Utility

  3. SIU #7 2nd Tier • Route 19 (MP 174) to Lake St. Louis Blvd (MP 214) • 40 miles in length, 13 Existing Interchanges • Current ADT: 29,000 to 68,000 • Year 2030 Projected ADT: 74,000 to 98,000

  4. Major Study Components • Conceptual Corridor Reevaluation • Rural Area Widening Alternatives Analysis • Urban Area Widening Alternatives Analysis • Interchange Alternatives Evaluation • Environmental Impact Statement • Public Involvement Program

  5. Conceptual Corridor Reevaluation • Existing I-70 Corridor • South Conceptual Corridor • Near North Conceptual Corridor • Far North Conceptual Corridor

  6. Conceptual Corridor Reevaluation Criteria • Compatibility with Local and Regional Planning Goals • Local and Regional Economic Impacts • Impacts on Natural Resources • Preliminary Construction and Maintenance Costs • Transportation Impacts

  7. Land Use Forum 2nd Tier • Local and Regional Land Use and Transportation Planners • 30 Participants from Warren, St. Charles and St. Louis Counties • Generally opposed to new corridors

  8. Travel Demand Modeling for Conceptual Corridor Reevaluation • GEC’s Statewide Travel Demand Model • EWGCC St. Louis Region Model • Evaluate “Downstream” Traffic Impacts on St. Louis County

  9. Rural Area Widening Alternatives Evaluation • Western Terminus (MP 174) to just west of Warrenton (MP 189) • Widen to North or South • Considered Displacements, Cultural Resources, Wetlands, Floodplains, Crossovers • Documented in Technical Memorandum

  10. Urban Area Widening Alternatives • 4 Through Lanes in Each Direction • 12-foot Inside Shoulders Separated by Barrier • Room for Future 5th Lane Reserved to Outside • Offset from Existing Centerline Varies

  11. Interchange Alternatives Evaluation • Brainstorming / Sketching • Study Team Review – Constructibility, Driver Expectation • Interchange Workshops with Locals • Screening based on Engineering, Traffic Operations, Socioeconomic and Natural Environment Impacts

  12. Traffic Operations Analysis Multiple levels of analysis = Multiple ‘tools’ • Conceptual Corridor Evaluation: HCS • Design Support: SYNCHRO, aaSIDRA • Alternatives Evaluation: VISSIM

  13. VISSIM • Allows for system analysis • 9 PM Peak Hour models 3 per county: existing, 2030, and 2030 alternate • Mainline • Interchanges • System to System • Diamond • Diamond with roundabouts • SPUI • Crossroads • Some frontage road intersections

  14. Current Status of Study • Draft Environmental Impact Statement Final Review Next Week • Public Hearing on Draft EIS November/December, 2004 • Final EIS Early 2005 • Record of Decision for SIU 7, Spring 2005

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