US Army Corps of Engineers
Buffalo District



About the Seaway Site

Seaway Site


The Seaway Site, located in Tonawanda, New York, was operated as a landfill from 1930 to 1993, accepting a variety of municipal, commercial, construction, and industrial wastes. Nearby, in the 1940s, the former Linde Air Products Division of Union Carbide processed uranium ores under contract to the Manhattan Engineer District (MED). The mill tailings from the FUSRAP-related activities were transported from the Linde Site to the former Haist Property, now known as the Ashland 1 Site. During the mid-1970's, Ashland Oil constructed oil tanks on the Ashland 1 property. During the construction, materials containing radioactive residues were removed from the area and transported by Ashland Oil to the Seaway landfill and what was the Ashland 2 Site and used as cover or grading material. This material was also placed in what is now known as Seaway Areas A, B and C.

During the Corps' remediation efforts at Ashland 1, FUSRAP-related materials at elevated concentrations were found that appear to extend onto the Seaway Site. At one location, elevated concentrations appear to extend under the capped portion of the landfill. Remediation of this material as part of the Ashland 1 remediation ceased at the site boundary. This area is referred to as Seaway Southside. There is also an area on the north side of Seaway near Area A where, during Ashland 2 Site remediation efforts, elevated concentrations of FUSRAP-related materials were found outside of the Seaway containment system (i.e., outside the area encompassed by the landfill's leachate collection system). This area is referred to as Seaway Northside. Both Seaway Southside and Seaway Northside are now included within the scope of the FUSRAP remediation activities for the Seaway Site.


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The U.S. Army Corps of Engineers released the addendum to the feasibility study and the proposed plan for the Seaway Site in August 2008. The comment period for the proposed plan was from August 25, 2008, to October 24, 2008. A public meeting to receive public comments was conducted on Wednesday, September 24, 2008. The comment period was extended to November 28, 2008.

In October 2009 the Great Lakes and Ohio River Division Commander executed the record of decision for the Seaway Site, which identifies Alternative 6 - Containment with Limited Offsite Disposal, as the selected remedy for the site. The comments received on the proposed plan during the public comment period and the responses are included in the responsiveness summary portion of the record of decision. The record of decision for the Seaway Site is available by clicking the link in the Reports section below. The record of decision and supporting documentation are available at the Seaway Site Administrative Record File link below.

The selected remedy requires excavation of FUSRAP-related material outside the landfill boundaries that exceeds the cleanup criteria and requires shipping it off-site for disposal. It also requires the capping of Investigative Areas A, B, and C within the landfill boundaries. The cap for the FUSRAP-related material will be constructed of multiple layers of various types of soil, fabric, and geomembranes at least 4.5 feet thick. Long-term monitoring of FUSRAP-related materials in capped areas, surveillance, and maintenance will be performed by the federal government. The federal government will ensure that land-use controls are in place to prevent future access to and disturbance of the contained FUSRAP-related materials. The selected remedy in the record of decision will be protective of human health and the environment and comply with applicable or relevant and appropriate requirements.

In fiscal year 2015 the Buffalo District initiated excavation and off-site disposal of contaminated soil located beyond the landfill leachate containment system on the Seaway Site North Side, which was completed in fiscal year 2016.

During fiscal year 2017 the Buffalo District completed an investigation to delineate the extent of FUSRAP-related contamination within Seaway Southside. Analytical results from soil samples obtained from 15 investigation test pits in the Southside area of the site projected a 70 percent increase in soil volume requiring excavation and disposal.  The FUSRAP-related soils form a lens measuring less than 1-foot thick that extended approximately 100 feet northwest of the previously identified area of contamination at a depth of around 12 feet beneath the landfill embankment. The Buffalo District also completed work plans for the excavation and off-site disposal of associated contaminated soils in fiscal year 2017.

Implementation of remedial action in Seaway Southside and the capping of Seaway Areas A, B, and C will occur later pending the completion of ongoing remediation at other FUSRAP sites and the availability of program funding.

The US Army Corps of Engineers Buffalo District welcomes your input at any time. Our goal is to offer timely and meaningful opportunities for public input to our projects and to promote the dissemination of project information to the community. Public involvement activities complement the Corps' mission to address environmental contamination at the Seaway Site from past Manhattan Engineer District and Atomic Energy Commission activities.

You are welcome to contact us. If you have questions, comments, or concerns regarding the Seaway Site, please send an e-mail to You may also mail a letter to:

USACE, Buffalo District
Attn: Special Projects Team - Outreach
1776 Niagara Street
Buffalo, NY 14207

or call us at 1-800-833-6390 (option 4).

Community Relations Plan for the Seaway Site (Apr 2015)


Click here to expand contentClick here to collapse content  News

News from the Corps

News from the Corps - 21 Dec 2017

News from the Corps emails are sent periodically when we have new information regarding the Seaway FUSRAP Site. To receive News from the Corps, please email us at and ask to be added to our list.


Northside/Southside Remediation - Site Operations Plan (Jun 2015)
     Northside/Southside Remediation - Waste Management, Transportation & Disposal Plan (Jun 2015)

Record of Decision for the Seaway Site (Oct 2009)

Proposed Plan for the Seaway Site (Apr 2008)

Feasibility Study Addendum, Seaway Site (Apr 2008)

Site Designation Letter, Seaway Industrial Park (Jun 1984)

(All document files are in Adobe Acrobat PDF format.)

The Administrative Record File for the Seaway Site is located at:

Tonawanda Public Library
333 Main Street
Tonawanda, NY 14150

To request specific FUSRAP documents, please fill out this Freedom of Information Act (FOIA) Request Form and submit it to the Buffalo District FOIA Coordinator listed on the form.


The administrative record file is a collection of documents that form the basis for the selection of a response action at an environmental restoration site. Under the Comprehensive Environmental Response, Compensation, and Liability Act, the U.S. Army Corps of Engineers is required to establish an administrative record for every remedial or response action under the Formerly Utilized Sites Remedial Action Program (FUSRAP). The administrative record file for the Seaway Site can be found at the following link:

Administrative Record File for the Seaway Site