Construction Management Options for Tunnel Rehabilitation:

1. Full closure of Storrow Drive during the construction.

· Estimated cost: $40 million

· Estimated project duration: 18 months

· Anticipated traffic impacts: All traffic will be detoured onto Back Bay streets; frequent to continuous traffic jams are anticipated during daytime peak hours.

· Anticipated times of heavy construction activity: 7:30 a.m.-7 p.m.

· Estimated area of Esplanade closed to public during construction: Approximately 1200 feet by 40 feet adjacent to the edge of the pavement from the Fiedler Foot Bridge to Clarendon street will be a construction zone.

· Total tree loss on the Esplanade and Back Street: 22 trees

2. Construct a temporary eastbound bypass road along Back Street and route daytime westbound traffic through the existing tunnel, with nighttime westbound shut down

· Estimated cost: $40 million

· Estimated project duration: 29 months

· Anticipated traffic impacts: Daytime, approximately 80 percent of traffic flow will be maintained; the remainder will be detoured onto local streets. At night, because of the full closure of the tunnel, westbound traffic will be detoured onto local streets.

· Anticipated times of heavy construction activity: 9 p.m.-6 a.m.

· Estimated area of Esplanade closed to public during construction: Approximately 1200 feet by 40 feet adjacent to the edge of the pavement from the Fiedler Foot Bridge to Clarendon Street will be a construction zone.

· Total tree loss on the Esplanade and Back Street: 70 trees

3. Construct a temporary eastbound bypass parallel to Back Street and a temporary westbound bypass road along the southern edge of the Esplanade.

· Estimated cost: $50 million

· Estimated project duration: 22 months

· Anticipated traffic impacts: Approximately 80 percent of traffic flow will be maintained; the remainder will be displaced onto local streets.

· Anticipated times of heavy construction activity: 7:30 a.m.-7 p.m.

· Estimated area of Esplanade closed to public during construction: Approximately 1200-foot by 40-foot area adjacent to edge of pavement starting at the Fiedler Footbridge to Clarendon Street to accommodate a temporary westbound bypass detour.

· Total tree loss on the Esplanade and Back Street: 89 trees

4. Construct an elevated parkway detour

· Estimated cost: $65 million

· Estimated project duration: 34 months

· Anticipated traffic impacts: A full closure of westbound traffic for three weeks while the elevated roadway is constructed. Once it is constructed, 80 percent of traffic flow will be maintained; the remainder will be displaced onto local streets.

· Anticipated times of heavy construction activity: 7:30 a.m.-7 p.m.

· Estimated area of Esplanade closed to public during construction: Approximately 1600-foot by 40-foot area adjacent to edge of pavement from the Hatch Shell to Dartmouth Street footbridge for a construction zone.

• Total tree loss on the Esplanade and Back Street: At least 100 trees.