Superfund Information Systems: Site Profile

Superfund Site:


Health & Environment

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What Are the Risks at the Site?

The site is bounded by private residential properties to the north and northwest. While the majority of the site is privately held in a trust, U.S. Fish and Wildlife Service owns about 35 acres of the site, which is part of the 7,800-acre Great Swamp National Wildlife Refuge that surrounds the site on the south, east and west. Potentially exposed human populations were evaluated for existing and future site conditions and include landscapers, recreators, trespassers, off-site residents, construction workers and future on-site residents. Access to the site is limited by surrounding wetlands and the property owners have posted no trespassing signs at the Britten Road access point. The land owners closely monitor for trespasser activity.


A baseline human health risk assessment was completed in 2014 and identified potential site risks to trespassers and future residential occupants. The baseline risk assessment was evaluated in 2016 to assess data gap sampling results and the risks identified remain the same.The baseline human health risk assessment was updated via a memo in July 2018 to include updated toxicity information, revised exposure scenario for trespassers/passive recreators and a re-evaluation of lead in soil due to new guidelines. The human health risk assessment found that cancer risks posed by the site are not elevated for the reasonably anticipated future user of the site (a trespasser or a passive recreator) and that non-cancer hazard index only slightly exceeded the benchmark of 1, with a hazard index of 3 for adolescents and 2 for adults. The primary risk drivers at the site are polychlorinated biphenyls (PCBs).

A screening level ecological risk assessment was completed in 2013 and was followed by a baseline ecological risk assessment which was completed in December 2016 and updated in May 2018 via technical memo to recalculate site-wide risk. Low potential risk was noted for vermivorous (worm eating) receptors and benthic invertebrates.




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Performance Measures

EPA uses performance measures to track environmental results at Superfund sites. If you have any questions or concerns about the measures at this site, please contact the site team members listed under Site Contacts.

Read more about Superfund Remedial Performance Measures.

Status at this
Superfund Site
What does this mean?
Human Exposure Under Control No Yes means assessments indicate that across the entire site:
  1. There are currently no unacceptable human exposure pathways; and
  2. EPA has determined the site is under control for human exposure.

No means an unsafe level of contamination has been detected at the site and a reasonable expectation exists that people could be exposed.

Insufficient data means that, due to uncertainty regarding exposures, one cannot draw conclusions as to whether human exposures are controlled, typically because:
  1. Response to the contamination has not begun; or
  2. The response has begun, but it has not yet generated information sufficiently reliable to evaluate whether there are currently any unacceptable human exposure pathways at the site.
Groundwater Migration Under Control Insufficient Data

Yes means EPA reviewed all information on known and reasonably expected groundwater contamination. EPA concluded the migration of contaminated groundwater is stabilized and there is no unacceptable discharge to surface water. EPA will conduct monitoring to confirm that affected groundwater remains in the original area of contamination.

No means EPA has reviewed all information on known and reasonably expected groundwater contamination, and the migration of contaminated groundwater is not stabilized.

Insufficient data means that due to uncertainty regarding contaminated groundwater migration, EPA cannot draw conclusions as to whether the migration of contaminated groundwater is stabilized.

Construction Complete No

Yes means the physical construction of the cleanup is complete for the entire site.

No means either physical construction is not complete or actions are still needed to address contamination.

Sitewide Ready for Anticipated Use No Yes means:
  1. All cleanup goals affecting current and reasonably anticipated future land uses of the entire site have been achieved, so there are no unacceptable risks;
  2. All required land-use restrictions or other controls have been put in place; and
  3. The site has achieved Construction Complete status.

No means that one or more of these three criteria have not been met. However, a site listed as no may still have redevelopment occurring on portions of the site and may be eligible for additional redevelopment.

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