Superfund Information Systems: Site Profile

Superfund Site:

INDIAN BEND WASH AREA
SCOTTSDALE, AZ

Health & Environment

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What Are the Risks at the Site?

The primary risk at the IBW site was to people who may have consumed contaminated groundwater before it was discovered in 1981. Since people are currently not drinking the contaminated groundwater, there is no direct human health threat associated with the groundwater contamination. All drinking water in the Scottsdale/Tempe area is provided by municipal drinking water suppliers. This water cannot be served to customers unless it meets all drinking water standards set by the federal Safe Drinking Water Act.

 

   EPA is  currently re-evaluating the vapor intrusion exposure pathway to identify and mitigate potential risk to occupants of residential and commercial buildings in the vicinity of historical industrial sources.

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Contaminant Information

The identified contaminants of concern include industrial solvents Trichlorethylene (TCE) and Perchloroethylene (PCE), 1,1 Dichloroethene (DCE) and 1,1,1 Trichloroethane (TCA) and Chloroform (TCM).  TCE is of particular concern as a human carcinogen and also is associated with fetal heart defects from exposure early in first trimester of pregnancy. 

 

In November 2017, EPA sampled all of the NIBW extraction wells leading to treatment plants serving public water supply for Per- and Polyfluoroalkyl Substances (PFAS), a new class of chemicals of concern associated with fire fighting foams and flame retardants.  No PFAS was identified in any Scottsdale wells.

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 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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