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Massachusetts Water Resources Authority
PROJECT UPDATE

Date:

Updated June 29, 2022

Contact:

MWRA Public Affairs


Weston Aqueduct Supply Main Rehabilitation - Medford, Somerville, Arlington
(Contract 6544)

map

image of CP1 rehab plan

About this Project:

MWRA’s Weston Aqueduct Supply Main 3 consists of approximately 10 miles of steel pipe installed in the 1920s and 30s. The pipe is a critical supply to over 250,000 customers in the Northern High, Northern Extra High and Intermediate High supply systems serving Waltham, Watertown, Belmont, Lexington, Bedford, Arlington, Somerville and Medford.  It also can provide emergency supply to the Gillis Pump Station serving communities of the North Shore and Northern Intermediate High communities. Figure 1 shows the full extent of the WASM 3 pipeline and the work limits for the current construction contract.

This first construction contract includes rehabilitation of approximately 13,800 feet of 56-inch and 60-inch diameter water main starting in Medford in December 2020, and continuing in Somerville and Arlington from Fall of 2021 to Spring of 2024. The rehabilitation will consist of cleaning and internal cement mortar lining of the pipe and adding valves for better operational flexibility.  Figure 2 shows the segments to be completed under this contract.

The work is restricted to low water demand months from September 15 to May 15, which necessitates three construction phases during the duration of the contract. This work restriction is necessary to ensure the main is operational during high summer demand periods. MWRA has awarded the construction contract to Albanese D&S of Dracut, MA.

Project Updates:

June 29, 2022

Work Update:

  • Work over 3 year duration
  • Rehabilitation of WASM 3- work only allowed from September 15th to May 15th due to demand.

Reconstruction of Arlington Plaza, ramps will be provided to maintain access to the plaza

April 28, 2022

Upcoming work:

  • Complete installation of new water main piping at Meter 171
  • Activation of Meter 90 - new flow meter in Somerville
  • Filing of segment 2 in Arlington in preparation for activation of WASM 3
  • Restoration of Arlington plaza

Broadway and Palmer

Broadway and Palmer

Arlington Center - pipe and backfill

Arlington Center - pipe and backfill

March 31, 2022

Update to Work: PDF

Upcoming work:

  • Continue closure of access pits along route
  • Complete installation of new water main piping and backfill at Arlington Center
  • Commence surface upgrade of Arlington Plaza area

Capen Court in Somerville near the Somerville Housing authority. 

Installation of new 60- inch steel pipe

Coral Street in Arlington-new pipe, bypass and blowoff

Coral Street in Arlington-new pipe, bypass and blowoff

Installation of new Meter 90 cabinet and McCrometer flow

Activation of portion of WASM3 to feed Meter 80 - Somerville

February 3, 2022

Work Timeline: Work to be done between May 15th to September 15th due to demand

Overview: The rehab of WASM pipeline will increase the flow capacity. This is a critical line and redundant for the tunnel. The pipeline is structurally sound bu some tuberculation has occurred and that will be cleaned.

Testing new 60-inch valves

Coral Street in Arlington (butterfly valve with structure around it)

Removal of existing valve in Arlington center

Capen Court - Somerville

January 5, 2022

Upcoming Items:

  • Excavation and construction of access pit in Arlington Center Plaza
  • Subcontractor will continue cleaning and cement lining of 60 inch steel WASM 3
  • Coordinate with Verizon to complete fiber optic duct bank relocation in Arlington center
  • Begun closure of access pits in Somerville

Steamer

Concrete conveyance

November 3, 2021

Upcoming Items:

  • Excavation and construction of cement lining access pits in Arlington
  • Subcontractor will commence cementlining of 60-inch steel WASM
  • Coordination with Verizon to complete fiber optic duct bank relocation in Arlington Center
  • Somerville Housing Authority plans to demo old MWRA metering on Capen Court

Building access pits at Mystic Shops Building to get access to 60-inch water main

Access pit in Somerville (exposed top of pipe)

Machine inside pipe to clean off tuberculation on Irvington Road in Somerville

Before shot of cut existing pipe with a lot of tuberculation and After shot once cleaned

September 28, 2021

Upcoming Items:

  • Dewatering of the WASM3 pipeline through Arlington and Somerville
  • Coordination with Somerville Housing Authority - access during construction and new building
  • Coordination with Arlington: Broadway Plaza businesses, Verizon duct bank relocation
  • Removing 3 trees in Somerville
  • Preconstruction photos and TV inspection of adjacent utilities in Arlington

Remobilization & Laydown Area

Dewatering area

September 28, 2021

Upcoming Items:

  • Dewatering of the WASM3 pipeline through Arlington and Somerville
  • Coordination with Somerville Housing Authority - access during construction and new building
  • Coordination with Arlington: Broadway Plaza businesses, Verizon duct bank relocation
  • Removing 3 trees in Somerville
  • Preconstruction photos and TV inspection of adjacent utilities in Arlington

Remobilization & Laydown Area

Dewatering area

September 7, 2021

Upcoming Items:

  • Coordination with Somerville Housing Authority - access during construction and new building
  • Coordination with Arlington - Broadway Plaza businesses (making banners)
  • Removing some trees in Somerville
  • MWRA Ops - Reviewing Dewatering Plan for next segment

Test Pit at Meter 171 - Broadway and Palmer

August 6, 2021

Upcoming Items:

  • Coordination with Somerville Housing Authority
  • Coordination with Arlington
  • Removing some trees in Somerville

Map divided in 3 sections over th next 3 years
1. Ist section in Medfird complete
2. Arlington & Somerville setion next

WASM Activation in May - Testing for PH and Chlorine

Restoration of the ball field (water cannons and continuous rain has helped with restoration)

Restoration of ball field

April 27, 2021

Boston Avenue air valve structure

Dewatering blow off connection

Installation of new steel pipe

Restoration of ball field

March 31, 2021

Work Done To Date:

  • Complete access pits with new steel pipe
  • Restoration of construction areas
  • Disposal of contaminated soil off site
  • WASM3 planning for disinfection/activation

Recent completion of cement lining

Recent completion of cement lining

Cutting existing steel pipe

Arrival of new steel pipe

Installation of new steel pipe

Closure of access pits

March 2, 2021

Cutting 60-inch steel water main in preparation or forthcoming replacement section

Mixing and conveying cement for rehabilitation of the water pipe

Machinery utilized for applying cement lining during rehabilitation of the pipeline

Steam machine for concrete curing

February 3, 2021

Work Done To Date:

  • Rehab of WASM 3 – Work will be conducted from Sept 15 to May 15th due to demand
  • Cleaning and cement mortar lining of approximately 4,870 feet of 56-inch steel water main
  • Cleaning and cement mortar lining of approximately 8,310 feet of 60-inch steel water main
  • Furnishing and installing (4) butterfly valves and appurtenances.

WASM 3 - recent work: Installing Access Pits

WASM 3 - recent work: Installing Access Pits

Removing section of pipe - tuberculation

Removing section of pipe - tuberculation

Cleaning

Rivets connecting pipes

November 25, 2020

Construction Update

Contruction updates will be posted here.

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Updated: June 30, 2022
Original Post: November 25, 2020