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United States Environmental Protection Agency
Waste Site Cleanup & Reuse in New England
  Serving Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont & 9 Tribal Nations
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 Site Type: Long Term/National Priorities List (NPL) Click to see more about Site Type and how it is used?


Map this site in Cleanups in My Community
 Bennington,  Vermont
 Bennington County
 Street Address: West Road
 Zip Code: 05404

 EPA ID #: VTD000509174
 Site ID #: 0101435
 Site Aliases:

 Site Responsibility: Federal, State, Potentially Responsible Parties

 Proposed Date 06/24/1988
 Final Date 10/04/1989
  Deleted Date 09/29/1999

Site Description
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Tansitor Electronics, Inc. manufactures electronic capacitors and is located on approximately 36 acres in a predominantly rural area of Bennington. According to the Vermont Department of Environmental Conservation (VT DEC), Tansitor disposed of the equivalent of 115 drums of process wastes in two areas uphill from the facility (Disposal Area and Concrete Pad Area). An estimated 1,500 residents of Vermont and New York obtain drinking water from private wells located within 3 miles of the site. Runoff from the disposal area entered a seasonal drainage behind the facility which discharges into a perennial stream south of Route 9. The perennial stream joins Brown's Brook, which is used for recreational activities and located within 3 miles of the site.

Threats and Contaminants
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The VT DEC found that the on-site surface water, groundwater, sediment, and soils are contaminated primarily with volatile organic compounds (VOCs). Process wastes were found to contain the VOCs trichloroethane and acetone, oils, and acid sludges. Due to the absence of contaminants in drinking water supplies, the site does not pose an imminent threat to the health of the nearby population. Current levels of contamination in soils and surface water do not pose a threat to the environment.

Cleanup Approach
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This site is being addressed in a long-term remedial phase focusing on cleanup of the entire site.

Response Action Status
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Entire Site In 1990, the potentially responsible parties began a comprehensive investigation to determine the nature and extent of contamination and to evaluate alternative cleanup remedies. The investigation determined that ingestion of groundwater from the shallow soils would pose an unacceptable risk. In 1994, the State agreed to reclassify the groundwater beneath the Site from Class I to Class IV. EPA concurred with this reclassification. In 1995, EPA issued a Record of Decision that selected the remedy for the Site. The selected remedy included a technical impracticability waiver for groundwater within a ten-acre portion of the Site, institutional controls to prevent contact with the groundwater, and groundwater monitoring to observe any changes in contaminant location or concentrations. The groundwater monitoring is ongoing.

2004 Five-Year Review As required under the Superfund law when waste is left in place that prevents unrestricted use of a site, EPA conducted a five-year of the site in 2004.
The 2004 review concluded that the remedy for the Site was protective of human health and the environment. Institutional controls had been implemented and annual reports certified compliance with the controls.Groundwater monitoring within the ten-acre area showed gradual reductions of VOCs and groundwater monitoring beyond the ten-acre area confirmed no migration of VOCs. Similarly, no contaminants were detected in the groundwater monitoring of the bedrock beneath the ten-acre area.

The 2004 review did identify the potential for vapor intrusion into indoor air form the groundwater plume and the potential for the presence of the chemical 1,4-dioxane because of its association with the manufacturing of trichloroethane, the primary contaminant detected in the groundwater.

2009 Five-Year Review The 2009 review reaffirmed the 2004 conclusions: the remedy for the Site was protective of human health and the environment; the institutional controls were in place and compliance was certified; the downward trend of VOC concentrations within the ten-acre area continued; and site-related contaminants were not detected in the groundwater beyond the ten-acre area.
In addition, while1,4-dioxane was found in the same locations within the ten-acre area as trichloroethane, it was not found outside the ten-acre area or in the bedrock thus it did not present any additional risk to human health and the environment.

Following the 2004 review, soil vapor data from the initial investigations were reviewed to assess the potential indoor air pathway. Because Vishay-Tansitor is an active manufacturing facility, the potential indoor air pathway was considered as an occupational exposure and the soil vapor data was compared to OSHA time-weighted eight hour values. The soil vapor data were found to be below OSHA values.

VT DEC, after reviewing the soil vapor data and information about the air exchange within the facility, and assessing the continued use of solvents within the facility, indicated that based on their experience at similar manufacturing facilities that the vapor intrusion pathway did not represent a significant issue.

2014 Five-Year Review The third five-year review concluded that the remedy remains protective of human health and the environment. Institutional controls have been recorded and remain in place, preventing exposure to site groundwater. Ongoing monitoring demonstrates that the plume is stable and concentrations are decreasing within the plume.

Environmental Progress
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The EPA assessed the conditions on the site and determined that institutional controls and groundwater monitoring will address the threat posed by the Tansitor Electronics, Inc. site. EPA, Department of Justice, and Vermont ANR negotiated a Consent Decree with the potentially responsible parties for implementation of the institutional controls and groundwater monitoring. EPA, after receiving comments from Vermont ANR, deleted the site from the National Priorities List (NPL) on September 29, 1999. Vermont ANR assumed oversight responsibilities for the site in December 1999.

Current Site Status
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The 1995 ROD specified institutional controls, long term monitoring, contingencies for further action based on the monitoring results, and five year reviews. A technical impracticability waiver was also included as part of the remedy. The Consent Decree for this remedy became effective in 1999. The institutional controls became effective in July of 1999 and the site was deleted from the NPL in 1999.

Long-term monitoring of the groundwater continues. This monitoring indicates the VOC concentrations, while still highly elevated in a few locations within the ten-acre area, are continuing to decrease and the monitoring outside the ten-acres confirms that the contaminants are not migrating beyond the ten-acre area.

Site Photos
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Links to Other Site Information
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Disclaimer Instructions about PDF

Newsletters & Press Releases:
Press Releases about this project  

Federal Register Notices:
Final NPL Listing  
Final NPL Deletion  

Administrative Records:
Administrative Record Index, OU 01 Record of Decision (ROD), September 29, 1995 (1,688 KB)  

Reports and Studies:
Five Year Review Report, September 30, 2004 (1,584KB)  
Second Five Year Review Report, September 23, 2009 (1.9 MB)  
Third Five Year Review Report, September 24, 2014 (1.57 MB)  

Decision Documents:
View Records of Decision (RODS) on-line (EPA HQ)  
Record of Decision (ROD), September 29, 1995 (4.67 MB)  
Institutional Controls at this site  

Other Links:
NPL Site Narrative at Listing:  
Site Progress Profile  

Site Repositories
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Bennington Public Library, 101 Silver Street, Bennington, VT 05201

OSRR Records and Information Center, 1st Floor, 5 Post Office Square, Suite 100 (HSC), Boston, MA 02109-3912 (617) 918-1440

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EPA Remedial Project Manager: Terry Connelly
Address: US Environmental Protection Agency
5 Post Office Sq., Suite 100
Mail Code OSRR07-1
Boston, MA 02109-3912
Phone #: 617-918-1373
E-Mail Address: connelly.terry@epa.gov

EPA Community Involvement Coordinator: Jim Murphy
Address: US Environmental Protection Agency
5 Post Office Sq., Suite 100
Mail Code ORA01-3
Boston, MA 02109-3912
Phone #: 617-918-1028
E-Mail Address: murphy.jim@epa.gov

State Agency Contact: Michael Smith
Address: VT Dept. Environmental Conservation
One National Life Drive
Davis One
Montpelier, VT 05602-3704
Phone #: 802-249-5826
E-Mail Address:


Serving Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont, & 10 Tribal Nations
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Last updated on Wednesday, November 4th, 2015
URL: http://www.epa.gov/region1/superfund/sites/tansitor