Big 5 Tunnel – Tunnel Rehabilitation Technical Study
Client: Walsh Environmental for, Colorado Dept. of Public Health & Environment
Location: Boulder County, Colorado, United States

In 2006, as an add-on to earlier work in support of the Captain Jack RI/FS, MES was retained to assess the Big 5 Tunnel and develop a work plan and cost estimates for tunnel rehabilitation and bulkheading. MES was the project lead for the work plan. Supporting sections included a geotechnical evaluation and ground control plan for the tunnel (by Deere and Ault), designs for surface water impoundments (by Gustavson & Associates and Walsh Environmental), and a work plan and cost estimates by MES.

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