Superfund Information Systems: Site Profile

Superfund Site:

POHATCONG VALLEY GROUND WATER CONTAMINATION
WARREN COUNTY, NJ

Health & Environment

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What Are the Risks at the Site?

GROUNDWATER
The residents in the OU1 area of the site’s groundwater contamination (TCE plume and PCE plume) are using municipal water for potable purposes, which is treated to meet drinking water standards.  However, a limited number of residences in these areas were not originally connected.  The PRP, under EPA oversight, has been conducting a screening of potential residences that were not originally connected to public water, conducting the sampling of potentially impacted wells, and is offering to connect residences to public water and seal their open wells, on an as needed basis.  The two groundwater extraction and treatment systems, which have been constructed and are fully operational, in Washington Borough will remove the high levels of PCE and TCE contamination from the groundwater, and in conjunction with natural attenuation, restore the aquifer to full use.

The residents in the OU2 T&I Area are not currently hooked up to public water as a public water supply does not exist in this area.  Until the OU2 remedy can be fully implemented, EPA continues to periodically sample individual residential potable wells to monitor TCE concentrations in the drinking water in the OU2 area.  EPA conveys sample results for wells with TCE exceedances of the NJ drinking water standard (one part per billion for TCE) to NJDEP.  NJDEP has taken action on these cases and has provided POETS to residences with groundwater impacted by TCE.

INDOOR AIR
EPA conducted a vapor intrusion assessment of the site within the OU1 and OU2 study areas.  Since 2006, three soil vapor extractions systems have been installed in three locations where indoor air samples exceeded indoor air screening values for TCE/PCE.  However, sampling data shows that there are no widespread indoor air issues attributed to site contaminants.

As part of the OU3 RI field program, in March 2013, a vapor intrusion investigation was completed within the former ANC building. Results indicated that significant elevated levels of VOC vapors were detected in both sub-slab and indoor air samples.  During the summer of 2013, a immediate measures were performed that included the installation of Soil Vapor Extraction and Sub-Slab Depressurization systems to mitigate exposure of TCE vapors inside the building. Results of subsequent sampling show the systems have reduced concentrations in the indoor and sub-slab air significantly and are within an acceptable range.


SOURCE AREA SOILS
Source area soils were evaluated as part of OU3.  It has been determined that OU3 soils, located on the former ANC property do not currently pose a risk to the public through direct contact, however, these soils continue to contrubute to groundwater contamination at the Site.

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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 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 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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