Sumner Tunnel Centennial Project Advisory Commission on Travel & Tourism- Briefing June 8, 2021 | 1:00 PM Project File No. 606476 Briefing Agenda 1. Welcome & Overview 2. Project Background 3. Temporary Construction Impacts 4. Public Involvement and Opportunities for Input 5. Q & A Why was this project initiated? Tunnel Entrance and Exit Deteriorating Arch and Walls Spalled concrete, rusted reinforcement, and damaged wall supports Deteriorating Ceiling Spalled concrete, corroded rebar, and rusted support beams What do we want to accomplish? Project Purpose and Benefits • Purpose: • Address the structural and functional system deficiencies of the Sumner Tunnel using accelerated construction strategies to minimize the overall duration of impacts to the travelling public and surrounding communities. • Benefits: • Improve tunnel safety • Reduce emergency and scheduled tunnel closures for maintenance • Smoother and more durable roadway surface • Updated technology - Improve cell phone, GPS, and radio service inside tunnel • Add new lighting and security systems Key Project Activities • Remove and replace the tunnel ceiling and repair overhead arch • Reconstruct tunnel deck and replace roadway surface • Repair tunnel walls and install painted fireproof panels • Install new LED lights inside tunnel • Upgrade CCTV and fire alarm systems • Install new utility conduits and cables Proposed Typical Section