Round Butte Dam

Image 2007-2009
Round Butte Dam is located about 90 miles southeast of Portland, or on and adjacent to the Warm Springs Reservation. Portland General Electric determined that a selective water withdrawal and fish bypass structure was necessary to ensure the survival of Summer Steelhead and Spring Chinook Salmon

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New Tacoma Narrows Bridge Washington State DOT

New Tacoma Narrows Bridge Washington State DOT | 2003-2004

The new Tacoma Narrows Bridge Project is a suspension bridge design that requires two foundation caissons to be installed in 150 feet of water. These foundations are required to withstand tidal flows of 8 to 12 knots. Associated Underwater Services, Inc. was selected to provide the subsea interventions for Tacoma Narrows Constructors, a Kiewit / Bechtel JV.

Kerry Donohue

Commercial diver Kerry Donohue rides a tugboat to the eastern caisson – or foundation – of the new Tacoma Narrows bridge. Donohue, vice president of Associated Underwater Services of Spokane, is one of 16 divers working on the bridge. They are removing roofs from 30 airtight chambers at the caisson’s base. See the story from the News Tribune

The subsea work included: installation and removal of 64 main anchorage systems, capable of generating 600,000 pounds of holding force each; inspection and service of the anchor wire and chain; installation and removal of slider beams; and the removal of 30 false bottoms.

AUS also provided ROV services and designed and built site- specific camera sleds for both internal and external inspections. AUS initially installed the main anchor blocks in the Tacoma harbor and were an integral part of the team during the towing and anchorage phase of the caisson placement. The caissons were held in position with 5 tractor tugs while the main anchors were attached. Subsequent tasks required dive intervention from 10 to 190 feet of water. Maintenance and repair on the anchor systems in the substantial tidal exchange proved to be a challenge that was overcome by initiative and careful planning.

2nd RSW at Ice Harbor Dam Walla Walla Army Corps of Engineers

2nd RSW at Ice Harbor Dam Walla Walla Army Corps of Engineers | 2004-2005

The Ice Harbor Dam RSW is the first production Removable Spillway Weir to be installed on the Snake River. The 1100 ton fish bypass structure was installed in spillbay 1 on the upstream side of the dam. As with the prototype, the RSW is hinged on the dam face and rotates to an up or down position using ballast tanks and a computerized ballast system.

Underwater installation tasks included drilling 16′ x 3.5″ core holes for grout injected anchor bolts using the drill pictured, undercut anchor bolt installation for bearing pads, and side seals. Concrete demolition was also required and state of the art wire saw techniques were utilized to remove portions of the pier nose. The specialized underwater wire saw is shown below. Remove drills, sonar, and sub-sea cameras were used to install the various components required to install the weir.

AUS performed hundreds of dives in depths of up to 135 FSW to complete the project. The project was completed under severe time constraints, on time, and with no lost time accidents. The RSW is operational for the 2005 spring fish migration.

Click here for more information on RSW’s

Sunken Vessel Inspection Pago Pago Harbor, American Samoa CH2M Hill

Sunken Vessel Inspection Pago Pago Harbor, American Samoa CH2M Hill | 2006

The USS Chehalis, a Patapsco class gasoline tanker, commissioned on December 5, 1944, caught fire and sank in 1949 with more than 400 gallons of petroleum cargo and thousands of rounds of artillery shells on board. The American Samoa Environmental Protection Agency is conducting an environmental impact study led by CH2M Hill. The vessel is lying in approximately 150 feet of water about 350 feet off the Fuel Dock at the main port facilities of Pago Pago, American Samoa.

The Port of Pago Pago not only provides virtually all economic viability for the Territory. but also plays an important role in fisheries and recreational activities for surrounding villages. ASEPA must understand potential threats to port operations, to environmental health, and to human safety.

AUS divers conducted an external inspection and provided video images of the orientation, attitude and condition of the vessel; a qualitative description of the character of the sea floor; provided water and debris field samples; identified locations, size and number of gun turrets and guns; identified impediments and entanglement hazards in potential future salvage operations.


From Maritime Magazine by David Cleary

Elm Road Generating Station Wisconsin Electric Power Company

Elm Road Generating Station Wisconsin Electric Power Company | 2005-2007

The Elm Road Generating Station is located on the shore of Lake Michigan in the city of Oak Creek, Wisconsin, approximately 12 miles south of the city of Milwaukee. The project involves the construction of two new coal-fired electric generating units and common facilities to accommodate up to 3,000 megawatts of generation at the site. Offshore construction will affect 22 acres of Lake Michigan through dredging, fill, stabilization, and placement of structures. AUS is the marine subcontractor assisting in the installation of four offshore water intake shafts, 12 foot in diameter. These shafts are 8,000 feet from shore in Lake Michigan.

The AUS divers contribute offshore experience to the heavy lifting and rigging involved in barge mobilization and anchor procedure; rigging and placement of platforms, piles, drill rigs and casings; welding operations on piles, platforms and barges; and drilling operations. The project began in June 2005, with a 2007 completion date.

BP Cherry Point Refinery Piling Inspection and Repair

BP Cherry Point Refinery Piling Inspection and Repair | Annual Contract

BP’s Cherry Point refinery has provided a significant portion of U.S. energy needs for more than 30 years. It is located along Pacific coastal waters in northwest Washington state and is the fourth largest refinery on the U.S. west coast.

The refinery processes a large share of Alaska North Slope crude oil, more than 225,000 barrels a day, into transportation fuels. That’s enough gasoline to keep one million cars on the road each day. It provides about 20 percent of the gasoline market share in Washington and Oregon, 85 percent of the jet fuel at Seattle International Airport, and is the largest west coast supplier of jet and diesel fuel to the U.S. military. Gasoline and jet fuel are also supplied to Vancouver, Canada, and markets in California, Arizona and Nevada. It also produces multiple diesel fuels, propane and butane, and about 2,700 tons a day of anode grade calcined coke used by aluminum smelters, making it one of the largest calcined coke producers in the world.

The refinery once processed Alaska North Slope crude oil exclusively. But with the decline of Alaska crude oil production, the strategic thrust today is to create crude oil processing flexibility with the ability to process low-cost crude oil stocks from a variety of sources. BP employs about 560 full-time workers and 375 contractors, one of which is Associated Underwater Services.

AUS has been inspecting, installing, and maintaining the protection on the pilings that support the many ship docking structures at the BP Cherry Point refinery for as long as AUS has been a company and before. BP’s emphasis on safety is witnessed by their membership in the ISNetworld safety consortium, of which AUS is also a member. The photos show pilings in need of repair and the occasional pleasant encounter with a baby seal.