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. providers of commercial and industrial demolition services primarily in the The Company is also one of the largest U.S. dredging company with significant international operations. Of dredging services in the United States and the only U.S. Great Lakes Dredge & Dock Corporation is the largest provider We look forward to working more closely with NASDI leadership to continue to expand NASDIs footprint. Berger, CEO of Great Lakes stated: NASDI has a strong Leading the effort to better integrate NASDI and Great Lakes. Pegg, Senior Vice President of Corporate Development at Great Lakes, is currently responsible for operations at NASDI and is As a result, Great Lakes will own 100% of NASDI,

Segment subsidiary. Upon receipt of Mr. Berardis resignation, Great Lakes exercised its option to call Mr. Berardis NASDI membership interest for a nominal exercise price. Mr. Christopher Berardi resigned his employment with Great Lakes demolition segment, effective April 29, 2011. Mr. Berardi owns a 35% Class B membership interest in NASDI, LLC (NASDI), Great Lakes primary demolition GREAT LAKES ANNOUNCES DEPARTURE OF DEMOLITION PRESIDENTĪpril 13, 2011 Great Lakes Dredge & Dock Corporation (NASDAQ:GLDD), the largest provider of dredging services in the United States and a major provider of commercial and industrial demolition services, announced that News from Great Lakes Dredge & Dock Corporation

Great lake dock and dredge