Leaky MBTA tunnels have been seeping Boston’s groundwater for years. Can a new plan prevent potential catastrophe?
By DAVID S. BERNSTEIN | April 30, 2008
For years, critics have called the MBTA a contributing culprit in the dangerously declining groundwater levels under the Back Bay and other parts of Boston — a problem that threatens to literally destroy much of the city’s architecture. But with a little-noticed announcement two weeks ago, MBTA General Manager Daniel Grabauskas may have turned the agency into the solution — if he can pull it off.Groundwater levels are declining for several reasons, but one is the leaky MBTA system. Rainwater that should be staying in the ground is instead dripping into MBTA tunnels in the Back Bay, South End, and elsewhere, where it gets pumped away to keep the tracks dry.
So, instead of replenishing, the groundwater drops — leaving exposed the wood pilings holding up the city’s buildings. Exposed wood rots. Rotted wood collapses.
To stave off this potential catastrophe, a multi-agency working group, pulled together by Mayor Tom Menino, has been dealing with the groundwater issue since late 2005. But individual agencies — such as the Boston Water and Sewer Commission, the Massachusetts Water Resources Authority, the Massachusetts Turnpike Authority, and, of course, the MBTA — were none too keen on getting stuck with the blame and the bill, activists have told the Phoenix.
In what one former critic dubs a “U-Turn” in attitude, however, the MBTA announced in mid April that it will spend $3 million over the next six years on a long-term solution.
That will include the installation of walls to prevent water from escaping the affected areas, and the construction of a well system that will monitor and recharge the water supply.
If all goes according to plan, construction should take place in 2010, with the system becoming fully functional in 2011.
That might be overly optimistic. Once design begins, the cost estimate could easily change — even double, warns one source, who doesn’t want to be named casting gloom on the welcome progress. The MBTA isn’t exactly flush with extra cash to pour into the project.
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