I-70 Twin Tunnels (Veterans Memorial Tunnels)

RS&H provided construction administration services on the $106 I-70 Twin Tunnels project for CDOT that added one eastbound lane from the East Idaho Springs interchange to US 6. RS&H was responsible for the inspection of wall, tunnel, and roadway elements as well as documentation and training. Inspection of the tunnel elements included concrete mud slab placement, formation drain installation, footer forms, rebar, concrete placements, liner rebar, Class 1 concrete finishing of liner, and contact grouting installation. The tunnel walls required inspection of all forms, rebar, and concrete placement. Inspection of roadway elements included the removal of asphalt, guardrails, and structure excavations; installation of storm drains, guardrail, and pavement markings; placement of ABC for subgrade; and asphalt pavement. RS&H also provided oversight for traffic control during construction.
Services included:

• Inspection of tunnel
  • Concrete mud slab placement
  • Formation drain installation
  • Footer forms, rebar, and concrete placement
  • Class 1 concrete finishing of liner
  • Contract grouting installation
• Inspection of roadway
  • Removal of asphalt, guardrails, and structure excavations
  • Storm drain installation
  • Guardrail installation
  • Placement of ABC for subgrade
  • Asphalt pavement
  • Installation of pavement markings
• Inspection of traffic control
• Inspection of reinforcement and cast-in-place concrete
• Inspection of rotomiling and resurfacing
• Inspection of ITS backbone installation
• Inspection of retaining wall installation