discovered that portions of the 84-inch diameter Wellesley Extension
Relief Sewer and the New Haven Street Drop Chamber immediately upstream
of the West Roxbury Tunnel are in critical need of repair. MWRA began repairs in 2001.
Roxbury Sewer Section Rehabilitation
Massachusetts Water Resources Authority
sewer and chamber convey wastewater not only from West Roxbury but also
from Ashland, Framingham, Natick, Wellesley, Needham, Dedham, Newton,
and Brookline to the High Level Sewer in Hyde Park. Once in the
Level Sewer, wastewater flows via Nut
Island to Deer Island for
treatment prior to discharge into Massachusetts Bay.
conducted in 1999 revealed significant pipeline corrosion (concrete and rebar) in the Wellesley Extension Relief Sewer and the New Haven Street
was also found in portions of the West Roxbury Tunnel which connects to
the New Haven Street Drop Chamber.
August 2000, JE/Sverdrup Civil, Inc. published its Preliminary Design
Report outlining the initial approach for immediate pipeline and chamber
repairs. The Wellesley Extension Relief Sewer Pipe will be rehabilitated
through insertion of a structural pipe liner and the New Haven Street
Drop Chamber repaired through open-cut excavation and reconstruction.
April 2000, JE/Sverdrup Civil Engineering, Inc. became an engineering
consultant to MWRA for rehabilitation of about 1,000 feet of the Wellesley
Extension Relief Sewer (Section 138) and the drop chamber at the west
portal of the West Roxbury Tunnel at New Haven Street.
construction easements are required to facilitate the work. No permanent
easements beyond those currently held are proposed. Temporary easements
have been acquired from:
immediately adjacent to the New Haven Street Drop Chamber
of the McDonalds and Arbys properties on VFW Parkway
(license to enter)
minimize release of odors the following measures are included in the construction
of wastewater stream Injection of oxidizing chemicals upstream
of the work to prevent in-stream transformation of sulfates to sulfides,
and then to hydrogen sulfide gas.
of sewer air Withdrawal of entrained air, which otherwise would
exit the sewer system at the excavation, through installation of fans
upstream of the work. Treatment of the air prior to discharge will be
provided in the form of chemical and/or carbon-type scrubbers.
monitoring devices Devices will be located on New Haven Street.
The equipment will monitor odors within a defined are of the New Haven
Street Drop Chamber. Equipment will be strategically placed on New Haven
Street to monitor odors within a defined radius of the construction
Jeff McLaughlin, Public Affairs: 617-788-1170