ENVIRONMENTAL DREDGING

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.


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.

 

Sevenson’s capabilities and experience includes mechanical dredging, hydraulic dredging, cutterhead dredging, horizontal auger dredging and excavation in the dry.

Sediment Capping

Sevenson uses several different capping approaches depending on project specifications, project location, water depths and environmental factors and cap material type.

Restoration

Sevenson works with restoration experts to design, permit, implement and monitor habitat restoration which comply with permit and plan requirements.

Temporary and Mobile Wastewater / Filtrate Treatment Systems

Sevenson offers construction, operation and maintenance of temporary and permanent water and wastewater treatment plants/facilities.

Project Gallery

DuPont Chambers Works FUSRAP Site

DuPont Chambers Works FUSRAP Site

Detroit Riverwalk Sediment Remediation

Detroit Riverwalk Sediment Remediation

Ryerson Creek Outfall Sediment Remediation

Emory River Dredging and Dewatering

Emory River Dredging and Dewatering

Former Clark and McMaster Street MGP Site

Former Clark and McMaster Street MGP Site

Cabot Koppers Superfund Site Phase 1 Remedial Action

Cabot Koppers Superfund Site Phase 1 Remedial Action

Former Kil-Tone Company Superfund Site Operable Unit (OU) 1 Remedial Action Phase 2

Former Kil-Tone Company Superfund Site Operable Unit (OU) 1 Remedial Action Phase 2

Martin Aaron Superfund Site, Remedial Action Phase 1, OU-1

Martin Aaron Superfund Site, Remedial Action Phase 1, OU-1

Former Portland Gas Manufacturing (PGM) Site Remediation

Former Portland Gas Manufacturing (PGM) Site Remediation

New Bedford Harbor Superfund Site

New Bedford Harbor Superfund Site

Hatheway and Patterson Superfund Site

Hatheway and Patterson Superfund Site

PGE Potrero Power Station Sediment Remediation

PGE Potrero Power Station Sediment Remediation

Former Sunflower Army Ammunition Plant Contaminated Pipe Removal

Former Sunflower Army Ammunition Plant Contaminated Pipe Removal

Former Seneca Falls MGP Site

Former Seneca Falls MGP Site

Study Area 6 Remediation Project

Study Area 6 Remediation Project

Mitchell Bay Interim Corrective Measure Remediation of Docks 6 and 7

Mitchell Bay Interim Corrective Measure Remediation of Docks 6 and 7

Vanadium Site Operable Unit #3 Remediation

Vanadium Site Operable Unit #3 Remediation

Welsbach/General Gas Mantle Superfund Site

Welsbach/General Gas Mantle Superfund Site

Former Tannery Site Remedial Action

Former Tannery Site Remedial Action

Syncon Resins Superfund Site – Operable Unit 2 Remediation

Syncon Resins Superfund Site – Operable Unit 2 Remediation

NYSDEC Dzus Fasteners Site

NYSDEC Dzus Fasteners Site

Former Bay City Manufactured Gas Plant Site

Former Bay City Manufactured Gas Plant Site

Former Hackensack Gas Works Site  Area E Sediment Remediation Project

Former Hackensack Gas Works Site Area E Sediment Remediation Project

Fort Wayne Former MGP Sediment Remediation and CSO Outfall Improvement

Fort Wayne Former MGP Sediment Remediation and CSO Outfall Improvement

Clean Closure of Five Coal Ash Ponds D.W. Mitchell Generating Station

Clean Closure of Five Coal Ash Ponds D.W. Mitchell Generating Station

Former Zephyr Oil Refinery Site – Fire Suppression Ditch Area Remediation

Former Zephyr Oil Refinery Site – Fire Suppression Ditch Area Remediation

Wagner Creek and Seybold Canal Restoration Project

Wagner Creek and Seybold Canal Restoration Project

Bayou d’Inde/Lower Canal Sediment Remediation

Bayou d’Inde/Lower Canal Sediment Remediation

Buffalo River Sediment Dredging and Habitat Restoration

Buffalo River Sediment Dredging and Habitat Restoration

Flint River Sediment Remediation East Boulevard Former MGP Site

Flint River Sediment Remediation East Boulevard Former MGP Site

Horseshoe Road Superfund Site

Horseshoe Road Superfund Site

Indiana Harbor and Canal CDF South Cutoff Wall

Indiana Harbor and Canal CDF South Cutoff Wall

River Raisin Area of Concern NAPL Area Sediment Dredging and Capping

River Raisin Area of Concern NAPL Area Sediment Dredging and Capping

Sediment Remediation Acid Brook Delta Dredging and Dewatering

Sediment Remediation Acid Brook Delta Dredging and Dewatering

St. Maries Creosote Superfund Site

St. Maries Creosote Superfund Site

Study Area 7 Sediment Dredging and Capping

Study Area 7 Sediment Dredging and Capping

Former Williamsburg Works MGP Site

Former Williamsburg Works MGP Site

Shpack Landfill Superfund Site Remedial Action

Shpack Landfill Superfund Site Remedial Action

Onondaga Lake Superfund Site Dredging and Capping Services

Onondaga Lake Superfund Site Dredging and Capping Services

Study Area 5 – Remediation of Hexavalent Chromium Contaminated Properties

Study Area 5 – Remediation of Hexavalent Chromium Contaminated Properties

Site Brook & Debris Piles Remediation Former CE Windsor Site

Site Brook & Debris Piles Remediation Former CE Windsor Site

Silver Lake Removal Action and Sediment Cap Installation

Silver Lake Removal Action and Sediment Cap Installation

Roebling Steel Company Superfund Site

Roebling Steel Company Superfund Site

Newhall Street Neighborhood Non-Public Properties Remediation

Newhall Street Neighborhood Non-Public Properties Remediation

Military Munitions Non-Time Critical Removal Action

Military Munitions Non-Time Critical Removal Action

Menominee River Sediment Removal

Menominee River Sediment Removal

Coal Tar Plant Sediment Remediation

Coal Tar Plant Sediment Remediation

Former Saranac Street MGP Site

Former Saranac Street MGP Site

Former Plant Site Remediation

Former Plant Site Remediation

Federal Creosote Superfund Site

Federal Creosote Superfund Site

DuPage River Sediment Remediation

DuPage River Sediment Remediation

Court Street MGP Site

Court Street MGP Site

Cornell-Dubilier Electronics Superfund Site – OU2

Cornell-Dubilier Electronics Superfund Site – OU2

Former Clifton MGP O.U.2 Remediation

Former Clifton MGP O.U.2 Remediation

Cherry Island Landfill Expansion

Cherry Island Landfill Expansion

Cecil County Central Landfill Cell 4 Redevelopment

Cecil County Central Landfill Cell 4 Redevelopment

Sheboygan Harbor Sediment Dredging

Sheboygan Harbor Sediment Dredging

Health & Safety is our primary concern at Sevenson

We have successfully developed and implemented site specific health and safety plans since 1979. With a staff that includes 30 full-time Health and Safety Officers that include CHST’s and OHST’s, our Site Safety and Health Officers average 14 years of service.

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(716) 284 - 0431

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2749 Lockport Road | Niagara Falls, NY 14305
P: (716) 284 - 0431 | F: (716) 284 - 7645