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South Boston CSO Storage Tunnel
Massachusetts Water Resources Authority

 

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CSO ANNUAL REPORTS
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MWRA 2007 CSO ANNUAL REPORT(Released 03/13/2008)

MAP OF MINING PROGRESS
June 20, 2008

CSO progress map

Mined portions of the tunnel are marked in red.
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TRACK MINING PROGRESS
Highlights - Updated June 20, 2008

ABOUT THE PROJECT

MWRA is constructing a 17-foot diameter, 2.1-mile long soft ground tunnel in South Boston.  When completed, the tunnel will virtually eliminate combined sewer overflows and stormwater discharges to the beaches in South Boston. This is the largest construction contract associated with the CSO control plan for South Boston. The work is being performed by MWRA contractors, joint venture of Shank/Balfour Beatty/Barletta. Tunnel workers called "sandhogs" mine the tunnel using a tunnel boring machine (TBM).

PROGRESS PHOTOS
January 10, 2008

Sand Hogs

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Sand hogs head into the tunnel.

Trailing Gear

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The TBM trailing gear in a lined segment of the tunnel. A ventilation system runs along the roof of the tunnel, and tracks have been placed on the tunnel floor.

back end

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A close-up of the TBM's back end and trailing gear.

Back of Cutter Head

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The back of the TBM's cutter head.

Lining In Place

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The liners after placement inside the tunnel.

Liners

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Tunnel liners are stored above the tunnel, where they are covered and kept warm until installation.
More Photos : ARCHIVE
MINING PROGRESS HIGHLIGHTS
06/20/2008 TBM at 7,544 feet.
06/13/2008 TBM at 7,092 feet. TBM has crossed Day Blvd.
06/09/2008 TBM at 6,700 feet.
05/29/2008 TBM at 6,044 feet.
05/19/2008 Mining resumed.
03/28/2008 TBM at 4,544 feet.
03/25/2008 TBM at 4,256 feet
03/24/2008 TBM at 4,104 feet
03/17/2008 TBM at 3,724 feet.
03/11/2008 TBM at 3,352 feet.
03/04/2008 TBM at 2,792 feet.
02/22/2008 TBM at 2,636 feet.
02/22/2008 TBM at 2,328 feet.
02/20/2008 TBM at 2,112 feet.
02/14/2008 TBM at 1,992 feet.
02/08/2008 TBM at 1,744 feet.
First curve begins.
01/24/2008 TBM at 1,016 feet.
12/24/2007 TBM at 369 feet.
11/26/2007 Mining stopped to install trailing gear.

Visit the MWRA CSO Main Page for more information about Combined Sewer Overflows and efforts to control them in Boston, Cambridge, Somerville and Chelsea.

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This page updated 23-Jun-2008 11:44 AM