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Massachusetts Water Resources Authority


Updated October 2, 2020


Jeffrey McLaughlin

Dorchester Interceptor Sewer Sections 240/241/242 Rehabilitation
(MWRA Contract 7279)

map of work area

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About this Project:

MWRA’s Dorchester Interceptor Sewer is approximately 6,500-linear feet and was constructed in 1895-1896 of brick. Recent internal inspections have revealed many structural and non-structural deficiencies in the 120-year-old sewer.

The Dorchester Interceptor conveys flows from MWRA’s Neponset Valley Sewer, as well as directly connected service areas in Boston and Milton, and discharges its flows to the BWSC owned and operated “BWSC Dorchester Interceptor” that carries flows to MWRA’s Columbus Park Headworks.

Internal inspections revealed that several segments of the MWRA Dorchester Interceptor had progressed from cracked to broken pipe since previous inspections. In addition, numerous areas of heavy root intrusion and light to heavy infiltration also exist (Manholes along the MWRA Dorchester Interceptor are mostly of brick construction with infiltration/inflow and deteriorating mortar issues. The Dorchester Interceptor is subject to high groundwater, and its rehabilitation will decrease the amount of infiltration from it into the BWSC Dorchester Interceptor.

Design and construction bidding services, performed by CDM Smith, are nearly complete and the construction contract is expected to be put out to bid in May 2019.  Construction is estimated to take 18 months.

Project Updates

October 29, 2020

Work Done To Date:

  • Cleaned sewer on Adams Street
  • Cleaned sewer on Butler Street
  • Cleaned through end of Phase 1 on the DCR Bike Path

Upcoming Work:

  • Submit Bypass plan
  • Install Bypass pump and piping
  • Begin Lining Process

Adams Street (both lanes closed for work)

October 2, 2020

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Project Overview:

  • Projects consists of private and public property work
  • Memorandum of Understanding, Permits and Easements have been obtained for all private property work
  • No road closures
  • Detour and lane closures will be used
  • Night work

Work Done To Date:

  • Health and Safety Plan approved
  • Preliminary community outreach completed
  • Installed field trailer
  • Obtained road occupancy permits for various Boston streets
  • Began televising and cleaning of sewer line

Upcoming Work:

  • Complete TV and cleaning of remaining sewer line
  • Submit Bypass plan
  • Install Bypass pump and piping

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Updated: October 29, 2020
Original Post: April 1, 2019