Great Lakes Dredge & Dock Corporation is a provider of dredging services. The Company provides dredging services in the East, West and Gulf Coasts of the United States and around the world. It operates in two segments: Dredging Operations, which involves enhancement or preservation of navigability of waterways or the protection of shorelines through the removal or replenishment of soil, sand or rock, and Environmental & Remediation Operations, which provides construction services on soil, water and sediment for clients in both the public and private sectors. It has interest in Amboy Aggregates, which is involved in mining sand from the entrance channel to New York Harbor for providing sand and aggregate for use in road and building construction, and for clean land fill; Lower Main Street Development, LLC (Lower Main), which is engaged in land development and sale business, and TerraSea Environmental Solutions (TerraSea), which is engaged in the environmental services business.