Superfund Information Systems: Site Profile

Superfund Site:

STANDARD CHLORINE OF DELAWARE, INC.
NEW CASTLE, DE

Health & Environment

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What Are the Risks at the Site?

EPA continues to evaluate potential exposure pathways, however the Site property is secured and the contaminated groundwater plume is not being used for drinking purposes.

Contaminants and Risks

  • Chlorobenzenes, heavy metals, PCBs and dioxins from spilled material have been found in the groundwater, soil, sediments, and surface water. People may have been exposed to the chemicals by direct contact with contaminated soil or accidentally ingesting contaminated soil or water.
  • Wetlands near the Site are impacted by contamination that emanated from the spill areas.
  • The levels of contamination in the soils, surface water, and sediment may impact the quality of the wildlife and the ecosystems along Red Lion Creek. Chlorobenzenes have been found in tissue of fish obtained from Red Lion Creek.
  • Using recently collected data, EPA and DNREC are currently re-evaluating and updating risk assessments for human health and the environment potentially posed by contaminants in the wetlands.
  • As part of the RI/FS for OU-4, EPA and DNREC are also conducting a risk assessment related to the contaminants in the deeper aquifer (Potomac Aquifer).
  • Contaminant descriptions and risk factors are available from the Agency for Toxic Substances and Disease Registry, an arm of the Center for Disease Control (CDC).

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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.

Performance
Measure
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 No

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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