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Waste Site Cleanup & Reuse in New England
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 Site Type: Long Term/National Priorities List (NPL) Click to see more about Site Type and how it is used?

  TOWN GARAGE/RADIO BEACON


Map this site in Cleanups in My Community
 Londonderry,  New Hampshire
 Rockingham County
 Street Address: HOLTON CIRCLE
 Zip Code: 03053
 Congressional
 District(s):

01
 EPA ID #: NHD981063860
 Site ID #: 0101162
 Site Aliases: Holton Circle Groundwater Contamination (Formerly Named)

 Site Responsibility: Federal, State, Potentially Responsible Parties

 NPL LISTING HISTORY
 Proposed Date 06/24/1988
 Final Date 03/31/1989

Site Description
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The Town Garage/Radio Beacon site includes a development of about 25 homes called Holton Circle, the Town Garage property on High Range Road, a recent development of 20 homes called Saddlebrook, and a wetland area. The site includes a series of residential wells and one commercial well, known as the Town Garage Well. The State conducted tests in 1984 and found several of the wells to be contaminated. The EPA and the State began investigating the area in 1985, but were unable to verify a source of the contamination. As stated in the 1992 Record of Decision (ROD), the Town Garage property is believed to be the source area for this contamination. An open floor drain was removed from the Town Garage in 1996. The Department of Defense previously owned the Town Garage property, located 1,000 feet west of the Holton Circle development, from the early 1940s to 1968 and operated a radio beacon there during World War II. The area around the site consists of mixed rural and residential properties and is being actively developed.

Threats and Contaminants
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The groundwater is contaminated with volatile organic compounds (VOCs) including dichloroethylene and dichloroethane. Residences with contaminated drinking water wells have been connected to a public water supply.

Cleanup Approach
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Response Action Status
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Initial Action In the late 1980s, six residences affected by well contamination chose to hook up to the local public water supply. Several other residences have since connected to the public water supply as a precaution.

Groundwater In 1992, the EPA completed an investigation into the groundwater contamination at the site. The final cleanup remedy selected in the 1992 Record of Decision was to allow the groundwater contamination to clean itself through natural attenuation, along with institutional controls to prevent the use of groundwater for domestic purposes. This cleanup process for the groundwater was estimated to take between 7 to 25 years to complete. A Groundwater Management Permit (GMP) has been issued by the New Hampshire Department of Environmental Services (NH DES) to the PRPs in 1997, 2002 and, more recently, in 2007 to provide for the required groundwater institutional controls at the site. The NH DES had been conducting groundwater monitoring at the site since 1994. Annual monitoring is currently being conducted by the potentially responsible party. The third five-year review was completed on March 2009.

Enforcement HighlightsOne potentially responsible party was identified. Under an Unilateral Administrative Order (UAO) issued by EPA, the potentially responsible party has taken over the required groundwater monitoring activities.

Environmental Progress
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After adding this site to the NPL, the EPA assessed site conditions and determined that the extension of a public water supply system to the affected areas has eliminated the immediate threat to human health. In addition, EPA determined that no further response actions are required to make the Town Garage/Radio Beacon site safe while natural attenuation of the groundwater occurs. EPA and the State continue to provide oversight for the groundwater monitoring being conducted by the potentially responsible party to measure the progress of the natural attenuation processes, and to ensure that existing residential wells in the area remain safe for groundwater consumption. A new residential development was created over a portion of the groundwater plume from 1997 to 1998. The development is served by public water and existing monitoring wells remain intact.

Current Site Status
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The overall scope of the monitoring program was reduced in 2001, consistent with results which generally indicated stable or improving conditions. Several monitoring wells have also been decommissioned. Groundwater contaminant levels associated with the original contaminants of concern have been greatly reduced and are close to achieving drinking water standards in all of the monitoring wells. In fact, only 1,1-DCE from one bedrock well fracture currently exceeds the drinking water standard for this contaminant of concern. A renewed Groundwater Management Permit, for establishing the appropriate institutional controls for groundwater, was approved by the State of NH in November 2007. The Third Five-Year Review was completed in March 2009.

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 30, 1992 (1,341 KB)  
Deletion Docket Index, Combined Notice of Intent to Delete (NOID) and Notice of Deletion (NOD) Docket from National Priorities List (NPL), May 2014 (530 KB)  

Reports and Studies:
Five Year Review Report, March 31, 1999 (712KB)  
Second Five Year Review Report, March 30, 2004 (602KB)  
Third Five Year Review Report, March 5, 2009 (15.3 MB)  

Decision Documents:
View Records of Decision (RODS) on-line (EPA HQ)  
Institutional Controls for this Site  

Other Links:
NPL Site Narrative at Listing:  
Site Progress Profile  
Notice of Intent to Delete (NOID) Town Garage/Radio Beacon from the National Priorities List (NPL), May 21, 2014 (1.36 MB)  
Notice of Deletion (NOD) Town Garage/Radio Beacon from the National Priorities List (NPL), May 21, 2014 (2.20 MB)  

Site Repositories
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Leach Library, 276 Mammoth Road, Londonderry, NH 03055 (603) 432-1132

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


Contacts
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EPA Remedial Project Manager: Bill Lovely
Address: US Environmental Protection Agency
5 Post Office Square, Suite 100
Mail Code: OSRR07-4
Boston, MA 02109-3912
Phone #: 617-918-1240
E-Mail Address: lovely.william@epa.gov

EPA Community Involvement Coordinator: Rodney Elliott
Address: US Environmental Protection Agency
New England Regional Laboratory
11 Technology Drive
Chelmsford, MA 01863-2431
Phone #: 617-918-8372
E-Mail Address: elliott.rodney@epa.gov

State Agency Contact: Kenneth Richards
Address: P.O. Box 95
Concord, NH 03302-0095
Phone #: 603-271-4060
E-Mail Address: kenneth.richards@des.nh.gov

 


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Last updated on Tuesday, August 5th, 2014
URL: http://www.epa.gov/region1/superfund/sites/towngarage