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Massachusetts Water Resources Authority


Updated November 3, 2021


Jeffrey McLaughlin, 617-305-5762,

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

map of work area

Go to Project Updates

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:

November 3, 2021

  • Completed manhole rehabilitation
  • Completed required pull tests
  • Completed de-mobilization of bypass pumping system
  • Completed site restoration of DCR bike path

Pull test and measuring epoxy

Removing bypass on Granite Avenue & repaving the trench

Paving on DCR bike path

September 28, 2021

Upcoming Work

  • Manhole rehabilitation
  • Punch list

September 7, 2021

Upcoming work:

  • Complete manhole rehabilitation

Continued work on manhole rehab

The entire manhole coded

August 6, 2021

Work Done To Date:

  • Completed remaining steam inversions
  • Completed water inversions (QTY 3)
  • Treated and disposed of water used for inversions
  • Set up and maintained one lane detour on Adams Street
  • Began manhole rehabilitation

Lining Progress - 100% Complete

Signage for the detour

Open tanks with tarps and ladders for safety

Water Cure Treatment System (Detour from Adams Street)

Setup for Water Cure Treatment

April 27, 2021

Work Progress

  • Completed excavation of manhole covers needed for liner installation
  • Extended bypass through the cemetery
  • Completed test pits to locate the pipes that run through the sewer
  • Cut and capped pipes that run through the sewer
  • Prepared for inversion from STA 161+22 to STA 157+55

Upcoming Work

  • Inversion from STA 161+22 to STA 157+55 by end of April
  • Cutting and finishing liner by end of April

March 31, 2021

Completed Work

  • BWSC will be completing additional test pits by the end of March
  • Began excavating around manholes, installing risers and concrete collars on Bike Path in preparation for lining
  • Continued to work on planning the reconfigured Bypass Route

Upcoming Work

  • Test Pits
  • Lining down the DCR Bike Path

March 2, 2021

Work Progress

  • Cleaned and TVed Phase 2

Upcoming Work

  • Reconfigure Bypass
  • Manhole Rehabilitation
  • Lining down the DCR Bike Path

February 3, 2021

Work Done To Date:

  • Completed Bypass Installation
  • Performed inversion from MH 193+71 to 189+55
  • Performed inversion from MH 189+55 to 184+43
  • Performed inversion from MH 184+43 to 180+40
  • Performed inversion from MH 180+04 to 179+72

Bypass going in to manhole

Steam Cured Liner being applied

Completed inversion from 184-43 out of Condominium Baker Properties

Repair MH 191+61 to 189+55

December 14, 2020

Work Done To Date:

  • Set up Bypass Piping along Bike Path
  • Set up Pumps in Walgreens Parking Lot
  • Set Up Bypass Piping along sidewalk on Central Avenue

Bypass piping being delivered to Butler Street

Bypass being installed off bike path near MBTA rails

Trench to connect bypass pump to manhole off Central Avenue

Trench to connect bypass pump to manhole off Central Avenue

November 30 through December 15 (193+71 through 179+72)

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: November 3, 2021
Original Post: April 1, 2019