With changes in global conditions, the country’s coastal regions face natural environmental threats from flooding and storm surges, as well as sediment deposits in our navigational channels. Cashman’s environmental and remediation work focuses on natural environmental issues, as well as pollution caused by marine-based or waterfront industrial use.

Because of our experience and techniques, Cashman offers Owners minimal risk to execute their sediment remediation projects safely, on schedule, accurately, and at a predictable cost. Our experience includes remediating PCBs in environments where concentrations exceed 100 ppm, heavy metals, dense non-aqueous phase liquids (DNAPLs), and other hazardous materials/chemicals. Our crews work on heavily trafficked waterways, including on riverine and open-water environments.

In the early 1990s, Cashman assisted in the cleanup of Boston Harbor and performed the challenging task of installing 55 effluent outfall diffusers on the ocean floor, nine miles from the shore. Cashman’s successes in the 1990s allowed the firm to tackle even more complex work such as contracts on the Boston Central Artery / Tunnel (CA/T) project, which included upland disposal of ~80,000 cubic yards of contaminated soil and hazardous waste.

In the past decade, Cashman has gained a sterling reputation with our Client and regulatory bodies for its environmental remediation dredging efforts on behalf of General Electric from 2009-2015 in cleaning up the Upper Hudson River. Considered the largest PCB-sediment remediation project in U.S. history, the EPA calls the multiple-season effort "a historic achievement."

And recently, a confined aquatic disposal (CAD) cell was used as part of the New Bedford Marine Commerce Terminal project,which Cashman completed in 2014. This was in addition to the New Bedford Harbor CAD cells that Cashman constructed as part of the EPA’s accelerated Superfund project to clean up PCB contamination of the New Bedford Harbor.

Cashman provides a variety of technical and industrial services for customers that require environmental / site clean-up and remediation.

Environmental Remediation Services

  • Environmental Remediation Dredging
  • Confined Aquatic Disposal (CAD) Cell Containment / Disposal
  • Blasting / Capping
  • Dewatering Management / Disposal
  • Facilities Decontamination / Demolition
  • Contaminated Soil / Sediment Excavation / Upland Processing and Disposal
  • Transport & Disposal of Contaminated Sediment / Soil
  • Site Restoration

Over the past decade, Cashman has emerged as an industry leader in environmental remediation solutions. We provide cleaner waterways and waterfronts through innovative dredging, capping, and processing techniques developed for major clients on the East and Gulf Coasts as well as in the Caribbean.


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Hudson River Environmental Remediation Dredging

Cashman Dredging was part of the dredging contractors that took part in one of the largest polychlorinated biphenyl (PCB) sediment remediation projects in U.S. history. When the final season was completed for General Electric in 2015, more than 2.75 million cubic yards of sediment from a 40-mile stretch of the upper Hudson River between Fort Edward and Troy, NY have been removed, and 100 percent of the PCBs targeted by the EPA have been addressed. It took "a world-class team of engineers and dredging experts to design and perform the work," which the EPA calls "a historic achievement."


Gowanus Canal Pilot Test Program

In 2014, Cashman performed a Pilot Study to evaluate different sheet pile designs and effects on infrastructure along the Gowanus Canal for future remediation work. Information gained during the Pilot Study was used to determine best remediation methods for the former Metropolitan and Fulton Manufactured Gas Plant (MGP) sites.


Arthur Kill Channel, Navigation Improvement 50-Foot Project (S-AK-2)

To prepare the Port of NY/NJ for the larger, post-Panamax vessels, a Cashman JV was contracted to deepen the existing 42- to 47-ft mean low water (MLW) Federal Navigation Channel System to a depth of 52 feet MLW (+1.5-ft overdraft). In a continuing effort to modernize the New York and New Jersey Harbors for the larger vessels, the JV began dredging the channel in December 2010 and was later awarded an additional contract to continue deepening the Arthur Kill Channel in 2011.


Lake Kittamaqundi Debris Removal / Dredging / Dewatering

Kittamaqundi is one of four man-made lakes created with the construction of the Columbia development. The lake served a dual purpose as a recreational feature and a low cost primary catch basin for water runoff from Wilde Lake into the Little Patuxent River. In the fall of 2010, Cashman began this 60,000-cubic yard pond dredging and dewatering project, completing it in November 2011. As sediment built up over the years since the lake's creation, the depth of the lake had become reduced. This dredging effort focused on restoring the lake to the original depths, reinforcing the banks, and creating two new peninsulas to enhance water flow. The Columbia Association chose Cashman for its proven skills in dewatering and its ability to tackle some of the toughest dredging projects.

For more information on Cashman multidiscipline projects