Superfund Information Systems: Site Profile

Superfund Site:


Health & Environment

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What Are the Risks at the Site?

When the site was place on the National Priorities List, the major risks at the Site were from i) the releases of dioxins, ii) furans and phenols from the Hatheway & Patterson facility to the Rumford River, impacted fisheries and wetlands, and releases of arsenic, chromium, copper, phenols and polycyclic aromatic hydrocarbons (PAHs) into groundwater which were deemed to pose a potential threat to nearby private wells..The objectives of the selected remedy, to address current and future risks due to direct contact and incidental ingestion of soil and risks to future users of groundwater, have been met. The remedy was completed from 2009 through 2010 due to funding provided by the American Recovery and Reinvestment Act of 2009 (ARRA). A total of 34,000 tons of soil was removed from the Northern Mansfield Property and the Foxborough Property and 9,500 tons of soil was removed from the eastern portion of the Southern Mansfield Property for off-site disposal to a RCRA subtitle C hazardous waste landfill. Although, approximately 5,000 tons of soil exceeding arsenic cleanup levels were consolidated in the “Capped Consolidation Area” on the Foxborough Property under a multi-layer low-permeability barrier, there are institutional controls in the form of Notice of Activity and Uses Limitations (NAULs) in-place, to prevent uncontrolled access to the Site. On-going monitoring conducted by the MassDEP per the O & M Plan provide further assurances that the Site no longer poses any threats to human health or the environment. MassDEP will continue routine monitoring of the Site, which includes semi-annual monitoring of groundwater and sampling of sediment and surface water at least once every five years.

With the implementation of the remedy outlined in the 2005 Record of Decision (ROD), risks to the public have been significantly minimized. The public, however, should heed all signage, physical restrictions, and other administrative measures that were included as part of the cleanup plan to keep risk to a minimum.

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Contaminant Information

View a full list of contaminants of concern for this site.

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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 Yes 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 Yes

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 Yes

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 Yes 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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