Great Lakes Dredge & Dock Corporation Deploys More Vessels for Work on Sand Berms Off the Louisiana Coast

June 30, 2010

Great Lakes Dredge & Dock Corporation – reported today that four of its dredging vessels, including three hopper dredges and one cutter suction dredge, along with other ancillary equipment, are currently working on the construction of sand berms off the Louisiana Coast in response to the oil spill caused by the Deepwater Horizon incident.

Two more cutter suction dredges are currently being mobilized to the area to aid in the berm construction along with four split-hull hopper barges, towing tugs and a loading barge. Great Lakes has a contract with Shaw Environmental & Infrastructure, Inc. Group (“Shaw”) (a wholly owned subsidiary of The Shaw Group, Inc.) to provide dredging services relating to the construction of sand berms off the Louisiana coast. Shaw has been retained by the State of Louisiana to construct the berms. The berm construction process involves dredging the sand and delivering it to a designated berm location.

Douglas B. Mackie, President and Chief Executive Officer, said “Great Lakes has committed its expertise and a portion of its fleet, crews and personnel to this important environmental undertaking. We are working in close conjunction with Shaw and the State of Louisiana.”

Great Lakes Dredge & Dock Corporation is the largest provider of dredging services in the United States and the only U.S. dredging company with significant international operations, averaging 30% of its dredging revenues over the last three years. The Company is also one of the largest U.S. providers of commercial and industrial demolition services. Additionally, the Company owns a 50% interest in a marine sand mining operation in New Jersey which supplies sand and aggregate used for road and building construction. Great Lakes has a 120-year history of never failing to complete a marine project and owns the largest and most diverse fleet in the U.S. industry, comprised of over 180 specialized vessels.

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Source: GLDD, June 30, 2010