Sevenson is the only pure remedial construction firm to successfully transition into environmental dredging. Transition began in 1993 at the Marathon Battery Superfund Site, Cold Springs, N.Y. Marathon Battery was the first large-scale Superfund site sediment dredging project.
Recognized as the leader in
Sevenson owns and operates a full complement of dredges, pumps, filtration tanks, filter presses, centrifuges, and related support equipment, successfully dredging sediments from rivers, lakes, creeks, coves, marshes,
waste ponds, and pits.
Sevenson has continued to work on some of the nation’s most visible sediment sites. These include: Hudson River, St. Lawrence River, Willamette River, Ohio River, Grasse River, Housatonic River, Hackensack River, Christina River, Pawtuxet River, Grand Calumet River, Raisin River, Menominee River, Saranac River, Emory River, Sheboygan Harbor and River, New Bedford Harbor and Gowanus Canal.
Sevenson operates a state-of-the-art treatability study lab that aids in the development of our approaches to sediment treatment and processing.
Dredging, Dewatering and Liquids/Solids SeparationSevenson's capabilities and experience includes mechanical dredging, hydraulic dredging, cutterhead dredging, horizontal auger dredging and excavation in the dry. Learn More
Sediment CappingSevenson uses several different capping approaches depending on project specifications, project location, water depths and environmental factors and cap material type. Learn More
RestorationSevenson works with restoration experts to design, permit, implement and monitor habitat restoration which comply with permit and plan requirements. Learn More
Temporary and Mobile Wastewater / Filtrate Treatment SystemsSevenson offers construction, operation and maintenance of temporary and permanent water and wastewater treatment plants/facilities. Learn More
Shpack Landfill Superfund Site Remedial Action
Onondaga Lake Superfund Site Dredging and Capping Services
Study Area 5 – Remediation of Hexavalent Chromium Contaminated Properties
Site Brook & Debris Piles Remediation Former CE Windsor Site
Silver Lake Removal Action and Sediment Cap Installation
Roebling Steel Company Superfund Site
Newhall Street Neighborhood Non-Public Properties Remediation
Military Munitions Non-Time Critical Removal Action
Menominee River Sediment Removal
Coal Tar Plant Sediment Remediation
Former Saranac Street MGP Site
Former Plant Site Remediation
Federal Creosote Superfund Site
DuPage River Sediment Remediation
Court Street MGP Site
Cornell-Dubilier Electronics Superfund Site – OU2
Former Clifton MGP O.U.2 Remediation
Cherry Island Landfill Expansion
Cecil County Central Landfill Cell 4 Redevelopment
Emory River Dredging and Dewatering
Sheboygan Harbor Sediment Dredging