Recent Progress: Virginia Tunnel Inspections

Recent Progress:Virginia Tunnel InspectionsJune 27, 2016RESTRICTED – CRITICAL INFRASTRUCTURE INFORMATION; This document and all information contained therein is considered asCritical Infrastructure Information and is to be handled in accordance with VDOT’s CII/SSI Policy and Guide. Information contained withinthis document and all field forms is exempt from public disclosure (FOIA) under The Code of Virginia §2.2 – 3705.2.

2Agenda Overview of Virginia Tunnels Tunnel Inspection PlanningProcess Recent Inspection Progress– Big Walker Mountain Tunnel– East River Mountain Tunnel (specialinspection)– New Midtown Tunnel– Monitor Merrimac Memorial Bridge Tunnel Lessons Learned

Tunnels in Virginia1Big Walker Mountain Tunnel2East River Mountain Tunnel3Hampton Roads Bridge Tunnel (2 tunnels)4Monitor Merrimac Memorial Bridge Tunnel5Downtown Tunnel (2 tunnels)6Midtown3 Tunnel (2 tunnels)7Rosslyn Tunnel8Thimble Shoal Tunnel9Chesapeake Channel Tunnel10117Roanoke Airport Tunnel89I-564 Runway Tunnel2110469381153

Tunnels in VirginiaNameTypeLengthYear BuiltBig Walker Mountain TunnelTwin Rock Bore (NATM)4228’1972East River Mountain TunnelTwin Rock Bore (NATM)5661’1974WestboundImmersed Tube7479’1957EastboundImmersed Tube7315’1976Immersed Tube4860’1992WestboundImmersed Tube3350’1952EastboundImmersed Tube3814’1987EastboundImmersed Tube4192’1962WestboundImmersed Tube4198’2016I-564 Runway TunnelCut and Cover662’1972Thimble Shoal TunnelImmersed Tube5738’1964Chesapeake Channel TunnelImmersed Tube5424’1964Rosslyn TunnelCut and Cover900’1983Roanoke Airport TunnelCut and Cover951’1985Hampton Roads Bridge TunnelMonitor Merrimac Memorial Bridge TunnelElizabeth River Downtown TunnelElizabeth River Midtown TunnelAverage Tunnel Age: 41 YearsRESTRICTD – CRITICAL INFRASTRUCTURE INFORMATION

5Tunnel Criticality Multi-Billion DollarInvestment Used by over 400,000Vehicles per Day Limited Detour Routes Over 20,000 events loggedeach year that requireoperator response

6Statewide Tunnels OversightCommittee (STOC)Formed in 2010 to providedirection and guidance for all ofthe tunnels across the state Executive Leadership Regional Operations Managers Operations Division Tunnel Managers

7Recent Progress: Inspections Preliminary Tunnel Inventory complete Began development of element inventory andinspection manuals Completed initial inspections of 3 tunnels:– Big Walker Mountain Tunnel– Monitor Merrimac Memorial Bridge Tunnel– New Westbound Midtown Tunnel Special inspection - tunnel fire at ERMT

8Tunnel Inspection Manuals Description of elementconfiguration and components Pre-inspection preparation andreview Tools and Equipment Personal Protective Equipment Field Inspection Procedures Reporting and Rating Procedures

9Tunnel Inspection Manuals

10Tunnel Inspection ManualsSketches explaining tunnel configuration

11Big Walker Mountain Tunnel (BWMT)

12Big Walker Mountain Tunnel (BWMT)

13Big Walker Mountain Tunnel (BWMT)Supply DuctExhaust DuctExhaust DuctSupply Duct

14BWMT InspectionInitial inspection performedover a three week period Week 1: Tunnel elements along theroadway with nightly lane closures Week 2: Ventilation ducts andmechanical/electrical equipment inbuildings Week 3: Testing switchgear andelectrical panels with planned nighttime outages

15BWMT – Civil/Structural Inspection of all civil/structuralelements along the roadwaywith single lane closures Inspection of supply andexhaust ventilation ducts aboveroadway (confined space entryprocedures)

16BWMT – Electrical Systems Visual inspection of equipment Infrared scanning to detect ‘hot spots’ Electrical testing per NETA MaintenanceTesting Specifications (MTS) Observation of generator load testing

17BWMT – Mechanical Systems Visual inspection and operation of all fans Vibration analysis of all fan bearings Review of maintenance records

18BWMT – Fire Life Safety Operation of all emergencyventilation modes Mobile Ventilation Units (MVU’s) Fire detection pull stations andemergency telephones Fire extinguishers, water storagetanks and hose connections Emergency communicationssystems

19East River Mountain Tunnel (ERMT) Tractor trailer fire in July 2014 Damage to tunnel lightingand conduits, wall tiles,ceiling slab, and pavement Special Inspectionperformed immediately toassess damage Both lanes were opened totraffic within 24 hours

20East River Mountain Tunnel (ERMT)Fire Damage to Wall TilesTaking Cores from Ceiling Slab

21East River Mountain Tunnel (ERMT) Damaged concrete inspected for crackingand spalling Concrete cores taken at fire location andunaffected area Petrographic analysis and compressivestrength testing– Fire damage limited to bottom ¾” of the slab– Concrete strength slightly reduced but stillexceeded design strength Repairs consisted of replacing mortar/tileon walls, and coating ceiling slab withepoxy

22New Westbound Midtown Tunnel Public private partnership between VDOTand Elizabeth River Crossings (ERC) New immersed tunnel constructed parallelto existingTunnel Section Graphic from ERC Opened to one lane of traffic on June 17,several months ahead of schedule Initial safety inspection completed byVDOT prior to opening

23New Westbound Midtown Tunnel To minimize delays, inspection began whileconstruction of tunnel interior finishes was stillunderway Detailed plan for commissioning and testing– Ensure proper function of systems– Avoid duplication of effort by inspectors Working closely with project team– VDOT– Elizabeth River Crossings (ERC)– SKW Constructors (Skanska, Kiewit, Weeks) Close out of all major inspection findings priorto opening to one lane of traffic

24New Westbound Midtown Tunnel

25New Westbound Midtown Tunnel

26Monitor Merrimac Bridge Tunnel [ADD JACOBS BULLETS/PHOTOS]

27Monitor Merrimac Bridge Tunnel

28Monitor Merrimac Bridge Tunnel

29Monitor Merrimac Bridge Tunnel

30Lessons Learned Review of maintenance and testing records for tunnelsystems Clear identification of inspection procedures for tunnelsystems, including any planned operation or testing Coordination meetings at the beginning and end ofeach day to discuss planned activities, provide updates,and monitor inspection progress Communication with tunnel maintenance staff,maximizing use of outages or lane closures to makerepairs immediately if possible

THANK YOURESTRICTED – CRITICAL INFRASTRUCTURE INFORMATION; This document and all information contained therein is considered asCritical Infrastructure Information and is to be handled in accordance with VDOT’s CII/SSI Policy and Guide. Information contained withinthis document and all field forms is exempt from public disclosure (FOIA) under The Code of Virginia §2.2 – 3705.2.

Virginia Tunnel Inspections June 27, 2016 RESTRICTED – CRITICAL INFRASTRUCTURE INFORMATION; This document and all information contained therein is considered as . Thimble Shoal Tunnel. 9. Chesapeake Channel Tunnel. Roanoke Airport Tunnel . I-564 Runway Tunnel. 10. 11. 8. 9. 11. 10. RES