Muddy River Flood Risk Management & Environmental Restoration Project
Phase 1 Construction Activities Next 90 Days
General: The Muddy River Flood Risk Management & Environmental Restoration Phase 1 Construction Project is located in the footprint generally between the Riverway downstream to Avenue Louis Pasteur. The major project components involve the installation of a 10-foot by 24-foot box culvert under the Riverway roadway, the installation of 10-foot by 24-foot box culvert under the Brookline Avenue roadway, daylighting of the area between the Riverway and Brookline Avenue, and daylighting of the area between Brookline Avenue and Avenue Louis Pasteur. Daylighting is the removal of existing twin 72″ culverts and excavation of the area to return the waterway to a natural state. This Notice is intended to identify the general construction activities that will be performed in the next 90 days. A figure that shows the existing conditions and the proposed improvements is at the end of this report.
May 2013 through June 2013 Period:
- The construction areas have been enclosed with fence and barrier to prevent access to active work areas by the public. We have cut some holes in the Sears Rotary screening on the Brookline Avenue sidewalk so that “Sidewalk Superintendents” can view the construction site.
- We have received banners that show the existing conditions and the proposed changes in the Phase 1 area. The banners will be hung from the fencing by the end of the first full week of May.
- Starting 1 May we have been conducting statnamic testing on the test concrete shafts. This testing will allow us to confirm the soil conditions and determine if the design length of the shafts are correct. The last statnamic test is scheduled for 8 May.
- Work has been underway on traffic management changes, primarily the reconstruction of the Landmark Center driveway and new traffic signal supports/signals, needed for the installation of the culvert under Brookline Avenue. Once fully implemented, traffic on Brookline Avenue between Fenway and Park Drive will be one way only headed inbound. This traffic change is expected to be implemented in early August. Traffic coming down Brookline Avenue or Boylston Street outbound that want to continue down Brookline Avenue to the medical center will need to travel around the rotary between Brookline Avenue, the Riverway and along Fenway. New traffic signals will be installed to ease the congestion that occurs when traffic traveling down Park Drive from Boston tries to merge with traffic exiting the Riverway from Brookline. A figure showing the new traffic pattern for this period is shown on at the end of this notice.
- Work has begun on relocating the driveway exit out of the Landmark Center onto Park Drive. This relocation is being done to allow traffic exiting to have access to the various roadways as they do now throughout the construction period and beyond. The relocation effort is expected to be completed in June/July 2013.
- We have been installing sheet pile that will allow us to excavate to the elevation needed to start installing drilled shafts. Some sheets are in and excavation has begun in the Sear Rotary area near Brookline Avenue. During this three month period drilled shafts will be installed to support the wing walls and culvert sections. The sheet piles are vibrated in place. People may feel vibrations during the installation. We have seismic monitoring equipment on site to monitor the vibrations. We have a “action level” regarding vibration that gives us a 3 times safety factor.
- After sheet pile installation is complete, the area within the sheet pile will be excavated, the supporting drilled shafts will be installed, the footings/wingwalls will be poured, and the culvert sections will be set. This work will all take place within the confines of the sheet pile cofferdam within the former Sears parking lot area until the traffic management change (making Brookline Avenue a one way—see above) is implemented in early August.
- Once the traffic management changes have been completed, work will begin on the installation of the Brookline Avenue culvert in the area where the Brookline Avenue roadway currently exists. This work will initially be conducted in the Sears rotary area (sheet piling installation commenced mid-April in the former Sears parking lot). As the work progresses further downstream, traffic pattern changes will need to be made to Brookline Avenue. We anticipate that work through July will not require additional traffic lane modifications although those will be needed as the culvert installation continues under Brookline Avenue. We will be sending out information regarding anticipated traffic lane modifications 2 weeks prior to the changes and 72-hours prior to the changes. If you would like to get on an email mailing list to be notified of these changes, please write to the Project Manager at the email address listed below.
- During the entire construction period, sidewalks will be maintained to allow safe passage of pedestrians. There will be some pathways, such as the diagonal path across the former Sears Parking lot that will be eliminated.
- Other early incidental work activities scheduled to happen during the upcoming 90 day period include soil borings, test pits and sampling, survey, and observation well installation. These activities will also require periodic roadway lane closures and pedestrian re-direction to allow for the work. All roadway lane closures will be supported by police details to assist in traffic management.
- There will be test pits excavated in Brookline Avenue to allow us to determine the exact location of a 48 inch water main, smaller water lines and two large storm drains. It is critical that these features are located so we can make sure that they are not affected by additional culvert work. Because of the difficulty in digging these test pits in the middle of the roadway we will need to do the work at night to avoid significantly impacting traffic in the area.
If you any questions, require additional information or would like to be added to the Project Contact List, please email the project mailbox at MuddyRiver@usace.army.mil
Muddy River rises March 14, 2010
(U.S. Army Corps of Engineers photos)
Project Phase 1
(U.S. Army Corps of Engineers photos)
Environmental Restoration Phase 1 – April 2013