 Hyperbaric Support
Project: Brightwater Tunnel - Central Contract
Client: Vinci Parsons Frontier Kemper
Owner: King County
Work Scope: Northwest Underwater Construction is contracted for multiple years to provide hyperbaric services including equipment and qualified personnel. NUC designed and fabricated the entire medical lock and shuttle system, mixed gas diving system, and other support gear. NUC is currently providing compressed air workers, mixed gas intervention personnel, diving medical technicians, hyperbaric nurses and other qualified
personnel for the project.
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| Man Lock Tenders and Compressed Air Workers performing an intervention on Brightwater |
Compressed Air Workers undergoing decompression |
Brightwater Shaft Entrance |
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Commercial Diving, Sonar, ROV, Man Lock Tenders
Project: Eastside CSA - Central Contract
Client: Kiewit Bilfinger Berger
Owner: City of Portland
Work Scope: Provide commercial diving (mixed gas and air) services to install rebar in block outs, place Tremie Plug reinforcing mat and tie bar, placement of water stop systems, slurry wall and concrete demolition, dredging. Also currently providing qualified man lock tenders for operations at the TBM and surface med lock.
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| NUC Owns and operates a wide variety of ROV’s |
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Commercial Diving - Deep Shaft and Tunnel
Project: Deep Shaft/Tunnel Project, Lakeshore Drive
Client: City of Chicago
Work Scope: The existing tunnel and shaft system was decommissioned. Our divers and dive supervisors performed diving operations to install mining rings to shore up 100 year old brick lined tunnels, installed reinforcement bars for mass concrete pour, built mechanical and sandbag bulkheads as forms for mass concrete pour, installed and anchored concrete pump hoses to the wall of the rigging points in the crown of the
upper tunnel to lower tooling and supplies to lower tunnel, performed hydraulic dredging and debris removal operations, utilized hydraulic tooling (breakers and diamond saws) to remove caisson plug, cut dog-house hatches from caisson into tunnel systems and various other diving activities. There were approximately 950 dives in the period of time with zero accidents and each operation was 100% successful.
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| Crew putting divers into deep tunnel shaft |
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ROV Tunnel Inspections - Partially Flooded Tunnel / High Flow
Project: Hebgen Dam Inspection
Client: URS Corporation
Owner: Pennsylvania Power and Light
Work Scope: NUC was hired to perform an internal survey of the Hebgen Dam intake structure and wood stave outlet tunnel. NUC engineered the inspection procedure to overcome complex issues including a flooded tunnel system with 800 cfm flows. The survey was conducted using our custom streamer ROV outfitted with multiple cameras, HID lighting, and imaging sonar.
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| Custom ROV-Pontoon for Tunnel High Flow Environment |
ROV-Pontoon being lowered to entrance of Tunnel |
Custom Crawler lowered through intake structure to inspect for damage |
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ROV Construction - Deep Shaft
Project: Deep Shaft Dredging and Tremie Placement of Concrete
Client: City of New York
Work Scope: Northwest Underwater Construction performed underwater construction and inspection tasks in the New York City aqueduct system. Divers were used to demo structures, cut access points in shaft decks for ROV insertion and perform shaft safety inspections. At NUC we structure our equipment components into fly-away units that can inexpensively and easily be shipped to construction sites around the world. Whether the task
includes underwater burning, concrete demolition (sawing, breaking and diamond wire cutting), video inspection or any other underwater specialty we have you covered.
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| Diver and ROV lowered for inspection |
CAD Rendering of sonar managed tremie pour in 400’ deep shaft |
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Roberts Tunnel / Dillion Reservoir ROV
Location: Dillon, Colorado
Work Scope: One of Northwest Underwater Construction's inspection class ROV systems was mobilized to Dillion Reservoir in Colorado to perform a long haul tunnel inspection. The work scope included highly accurate three dimensional positioning to inspect a section of tunnel thought to have failed and caused a subsidence in the reservoir bottom. During the inspection the ROV recovered sediment samples and salvaged other debris
located in the invert of the tunnel. Dual imaging sonar was used to map fractures and accurately dimension the tunnel system.
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