Superfund Information Systems: Site Profile

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Health & Environment

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What Are the Risks at the Site?

At each site, EPA determines the possibility for human and ecological contact (i.e., exposure) with contaminants at the site. EPA determines if the site poses a risk to humans, and if so, identifies actions that can be taken to control any possible exposure to humans until site cleanup has been completed. Once complete, cleanup provides long-term human health and environmental protection at the site. (Superfund risk assessment process)

The Superfund process starts with including the site on the Superfund National Priorities List (NPL). Sites on the NPL are investigated and evaluated for risks to human health and the environment, and then appropriate cleanup actions are taken. Now that the Rockwell Grenada is listed on the NPL, a remedial investigation will be conducted that includes a basesline risk assessment. The baseline risk assessment identifies and quantifies the risks to human health and the environment, and is used to determine the appropriate cleanup goals. Cleanup actions are then planned and implemented.

The Agency for Toxic Substances and Disease Agency (ATSDR) conducts a Public Health Assessment for each site on the NPL. ATSDR has already initated the processes to conduct a Public Health Assessment for the Rockwell Grenada Site.

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Contaminant Information

•    TCE contamination has been found in: the air inside the manufacturing building on-site; ambient (outside) air; groundwater beneath the site, the adjacent Eastern Heights neighborhood and a former disposal area associated with the facility; nearby wetlands; and Riverdale Creek.
•    EPA has been working in OU1 to complete additional environmental sampling to determine the full extent of Site contamination for drafting of the Remedial Investigation in OU1 which will include a Full Baseline Risk Assessment.
•    A final site-wide cleanup decision is not expected for several years, cleanup decisions can be made on portions of the Site based on OUs or using Removal Authority under specific criteria. In the future, EPA and the responsible parties will complete the site-wide Remedial Investigation/ Feasibility Study to evaluate options for the cleanup. Before selecting a remedial cleanup strategy for any portion of the site, EPA will present the propose the plan to the public for input.




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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 Insufficient Data 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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