MEMORANDUM TO: FR: RE: DA: Richard A. Davey, Secretary & CEO Frank DePaola, Highway Division Administrator Ongoing Work in the MHS Tunnels May 23, 2014 To follow is a summary of maintenance and construction activities performed last week in the Metropolitan Highway System Tunnels. Overnight work: MassDOT closed the I-93 Northbound Tunnel overnight to allow for maintenance, cleaning and repair work in areas of the tunnel not normally accessible while traffic is flowing. This was the first Northbound closure of the season. Contractors are repairing water infiltration at multiple points within the O’Neill Tunnel (both directions) and on related ramps. Water infiltration repair work is also underway in the I-90 Connector Tunnel (both directions) and the Ted Williams Tunnel Eastbound. A contractor working on behalf of the Massachusetts Convention Center Authority is performing ongoing ceiling-related construction in the Prudential Tunnel. The contractor continues to repair the walls and remove supplemental steel and concrete, which requires periodic lane closures. A contractor working on behalf of the owner of the Prudential Center continued work on the ceiling of the Prudential Tunnel Westbound. This is a different section of the ceiling than what has been noted above. MassDOT continued the Callahan Tunnel rehabilitation with repairs to the tunnel wall and installation of the wall panel support system. The tunnel re-opened in March; rehabilitation work continues with periodic lane closures as needed. A contractor performed a routine inspection of portions of the I-93 Southbound Tunnel and related ramps. A contractor also performed a similar inspection on the Northbound side. A contractor is also inspecting the I-90 Connector Tunnel (both directions) the HOV Tunnel, and the Eastbound tunnel set. A contractor continued repairs to the roadway wearing surface near the entry portal of the Ted Williams Tunnel Westbound. MassDOT workers performed routine maintenance and cleaning of the wet well in the Ted Williams Tunnel Westbound. MassDOT workers ran new wire to repair a short in a wiring circuit in the CANA Tunnel Northbound. MassDOT workers installed fencing above the roadway at the Sumner Tunnel exit portal. The work required lane closures in the tunnel. MassDOT workers replaced the pan, tilt, zoom unit on a traffic camera in the vicinity of Ramp E-SB (I-90 Eastbound, Exit 25). MassDOT workers cleaned a drainage structure at the convergence of Ramps SA-CN (Cross Street to I-93 Northbound) and ST-CN (Sumner Tunnel to I-93 Northbound).