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Tunnel Segments
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Alder Shaft
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Slurry separation plant workers
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Opera Shaft overview
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Opera Shaft Groundbreaking
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Outfall 28 (SE 18th and Insley)
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Outfall 46 breakthrough
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Group shot of workers when MTBM broke through at Outfall 46
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Outfall 40
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Microtunnel Boring Machine (MTBM) suspended over shaft
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Opera Shaft
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Workers examing hydromill teeth
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Opera Shaft
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Clam exiting shaft
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Opera Shaft
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West side of TBM front and tail shield & Bowflex seal before start of tunneling
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Opera Shaft
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Tunnel Boring Machine (TBM) front shield underside showing push rams and hydraulic lines
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Steel Bridge Shaft site
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Microtunnel Boring Machine (MTBM) under assembly
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East Side CSO tunnel
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View of northbound tunnel with inspector
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Opera Shaft
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Close up overview with front shield and workers
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Opera Shaft
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The cutterhead of "Rosie" the TBM gets christened with the project team
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Opera Shaft
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Diver looking out of decompression chamber
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Opera Shaft
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Conveyor positioning over river
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Alder Shaft
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Flooded excavated shaft with Montage and Portland Storage Co in background
Environmental Services is working on final design of the Portsmouth Force Main...
Construction has begun on the shafts of the East Side CSO Tunnel Project.
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| Tunnel Progress |
| Follow the Tunnel Boring Machine of the East Side Big Pipe Project |
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| Outreach |
| Community outreach and opportunities |
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