Superfund Information Systems: Site Profile

Superfund Site:


Health & Environment

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What Are the Risks at the Site?

Potential receptors evaluated under the current land use scenario included workers in EA 2 through 4, trespassers in EA 2, and residents in EA 2. EA 1 was not considered for current exposure because it is paved and there in no current exposure. Potential receptors under the future land use scenario included residents, workers, trespassers and construction workers in all exposure areas.

Exposure pathways for soil included incidental ingestion, dermal contact, and inhalation of particulates and volatiles released from soil by residents, workers, trespassers, and construction workers. Exposure pathways evaluated for groundwater included ingestion for future Site workers, and ingestion, dermal contact, and inhalation (vapor released during showering and bathing) by future residents. Additionally, future residents were evaluated for the potential exposure to volatile COPCs via inhalation of vapors emanating from groundwater into enclosed structures (i.e., vapor intrusion). Exposure pathways for surface water and sediment included incidental ingestion and dermal contact by recreational users of the Rio Arroyata.

For current receptors, estimated cancer risks and non-cancer hazards for Site-related contaminants were below or within EPA’s target threshold (cancer risk of 1×10-6 to 1×10-4 and non-cancer Hazard Index [HI] of 1) for all EAs.

With the exception of workers (2 x 10-4) and residents (1 x 10-3), the estimated total cancer risks for future receptors in each exposure area were either below or within EPA’s target range of 1×10-6 to 1×10-4. The noncancer health hazard for future residents ranged from 80 to 93 in the varying EAs. The potential health hazards are associated with the following Site- related chemicals of concern: PCE and TCE in groundwater and PCE in EA 3 soils.  Future workers in EA 3 have a noncancer HI of 10. The potential non-cancer health hazards are mostly attributed to PCE in soil.


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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 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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