| Site Type: Long Term/National Priorities List (NPL) |
Map this site in Cleanups in My Community
| Barrington,  New Hampshire|
| Strafford County
| Street Address: ||TIBBETTS RD. |
| Zip Code: || 03825 |
| Congressional |
| EPA ID #: ||NHD989090469 |
| Site ID #: ||0101208 |
| Site Aliases: |
| Site Responsibility: ||Federal, State, Potentially Responsible Parties |
| NPL LISTING HISTORY |
| Proposed Date ||04/10/1985|
| Final Date ||06/10/1986 |
The Tibbetts Road Site occupies approximately 2 acres. The Site was used for storing drums collected from 1944 to 1958. Many of the drums were leaking and rusted and contained thinners, solvents, antifreeze, kerosene, motor and transmission oil, polychlorinated biphenyls (PCBs), grease, and brake fluid. The EPA removed all the deteriorating drums and surface contamination in 1984. Groundwater remedial actions commenced in 1995 and transitioned to Monitored Natural Attenuation ("MNA") in 1998. In 1998 the Site was graded and re-planted with poplar trees to assist in the MNA remedy. The area surrounding the Site is served by a water supply system created to serve nearby residents whose wells were impacted by groundwater contamination originating from the Site. That system currently serves approximately 80 homes. The surrounding community relies on groundwater for drinking water.
Threats and Contaminants
The ground water is contaminated with volatile organic compounds (VOCs), including benzene, trichloroethylene (TCE), toluene, xylenes, and arsenic. Soil was contaminated with solvents, PCBs, and dioxin. People who accidentally ingest or come into direct contact with contaminated ground water are potentially at risk.
The Site is being addressed in two stages: immediate actions and a long-term remedial phase focusing on groundwater contamination.
Response Action Status
|Immediate Actions ||In 1984, the EPA removed approximately 337 deteriorated and leaking drums stored within 50 yards of private residences and disposed of them at an approved off-site disposal location. Residents were temporarily relocated while the drums were being removed. During the summer of 1985, the EPA and the State conducted an investigation to determine whether any additional materials needed to be removed from the site. Low levels of dioxin were detected in the soil, and VOCs were found in the drinking water. The EPA and the State began a joint soil removal effort between 1985 and the summer of 1988. This effort included the removal of PCB- and dioxin-contaminated soils which were eventually incinerated off-site, and solvent-contaminated soil which was excavated and disposed of off-site by the State. A water supply system, constructed to provide drinking water to the 45 homes with contaminated wells or wells with the potential to become contaminated, became operational in 1987. The water supply system was been expanded since 1993 to include several additional nearby residences. |
|Initial ground water remedial actions ||The shallow overburden and deeper bedrock aquifers are contaminated with VOCs and arsenic. The ground water contamination extends beyond the property boundaries to both the north and southwest. An alternate water supply system provides safe drinking water to those residents with affected or potentially affected wells and a local ordinance enacted by the Swains Lake Village Water District places restrictions on the use of the ground water around the site. EPA selected vacuum extraction and pumping and treating of the contaminated ground water as the cleanup technique in a Record of Decision signed in 1992. The vacuum extraction component of the ground water remedy operated from 1995 to 1997. During that time, the system removed over 800 pounds of contaminants from the soil and ground water. The system was finally shut down in 1997 due to a reduction in contaminant recovery efficiency. |
|Current ground water remedial actions ||Biodegradation and phytoremediation is now being used at the site to address the contamination remaining in the soil and the ground water in order to achieve the final cleanup goals in the ground water. In addition, some supplemental hot spot remediation is being accomplished through selective use of the vacuum extraction system to eliminate contamination. An amended Record of Decision (ROD) describing these changes was issued by EPA on September 28, 1998. Approximately 1,400 Hybrid Poplar trees were planted at the site in 1998 as part of the phytoremediation process. The effectiveness of the amended cleanup remedy continues to be monitored by the EPA, the State of New Hampshire, and Ford Motor Company (the potentially responsible party (PRP) for the site). |
|Other ground water remedial actions ||In 2003, preliminary evaluations of a new, in situ ground water treatment technology involving chemical oxidation began. The technology involves injecting sodium permanganate via wells into localized areas of ground water contamination. Sodium permanganate is designed to oxidize (destroy) organic compounds such as the Site contaminants. This preliminary evaluation has been terminated and EPA and the PRP group believe that sodium permanganate is not a viable remedy at the Site. |
|Swains Lake Village Water District ||Due to recent concerns regarding the potable water supply to homes affected by contamination, EPA, NHDES and the PRP assisted the Swains Lake Village Water District in establishing a new source of drinking water. The new source of water are two wells on a protected parcel of land. The new source has met all specifications. |
|Cedar Creek Subdivision ||A recently built subdivision, Cedar Creek, installed 16 bedrock drinking water wells in close proximity to the area that prohibited groundwater use. Subsequent withdrawals for domestic use has seen the migration of Site contaminants to at least 4 of those wells and contaminated them at low levels with benzene and trichloroethylene among other contaminants. The PRP has installed point-of-use filters at the affected homes and monitors groundwater to ensure there is no exposure to Site contaminants. |
|Enlargement of prohibited Groundwater use area ||The Town of Barrington enacted an Ordinance in 2014 expanding the area that prohibits the use of groundwater. |
|Extension of Water Service ||During the summer of 2015 the residents of the Cedar Creek subdivision will be connected to the water supply system by the PRP and their wells abandoned or re-used for monitoring. Construction of the extension is underway. |
|Bedrock Groundwater Remedy ||Tracer and pump tests have been performed to assess the character of bedrock fractures. Once the Cedar Creek subdivision is connected to the water supply system, more aggressive pilot studies will be performed to determine the most effective means of reducing or eliminating groundwater contamination.|
|Overburden Groundwater Remedy ||A small area of contamination was found on the southwest corner of the property. During the summer of 2014 contaminated soils were removed from this area. Monitoring and evaluation of this action continues. Regardless, the area is very limited and does not appear to be migrating.|
|Enforcement Highlights||On November 8, 1994, the United States, the State of New Hampshire, and the Swains Lake Village Water District signed a Consent Decree with Ford Motor Company. Under the terms of this Consent Decree, Ford is performing actions to reduce contamination at the site and clean up the ground water. Ford is also partially funding the drinking water supply system. |
The removal of the drums, treatment of contaminated soil and ground water, and the provision of a new water supply at the Tibbetts Road site have reduced the potential for exposure to contamination. These actions have helped to protect public health and the environment while efforts are underway to effect a groundwater cleanup remedy.
Current Site Status
Groundwater monitoring continues at the site to assess the effectiveness of the ground water remedy. Ground water treatment has evolved at the Site from a vigorously operated vacuum extraction system that actively removed and captured site contaminants to planting of poplar trees to reduce ground water flow and enable native micro-organisms to continue to consume contaminants. EPA completed its first Five-Year Review of the remedy at the site in 2003, a second in 2008, and a third in 2013 (see "Link to Other Site Information" below for additional details). These documents confirm that progress is being made in the cleanup of the Site. The 2013 Five-Year Review found that there were no current issues that affected the protectiveness of the remedy and that the soil and ground water remedies already in place continue to be protective of human health and the environment. The levels of VOCs in the shallow ground water beneath most areas of the site, which historically has shown some of the highest concentrations, are now at or approaching cleanup levels; however, a portion of the weathered bedrock located to the northeast of the Site has shown more limited progress in achieving the required cleanup levels for VOCs. EPA and the PRP are exploring additional means to address this contamination. The 2013 Five Year Review identified issues that may affect protectiveness, primarily that ground water has not been restored to protective levels and the need to extend the area of prohibited groundwater use (which occurred in 2014 thru an ordinance passed by the Town of Barrington). The extension of groundwater use restrictions in the area will require that the water supply system must be extended to homes in the Cedar Creek subdivision, which is underway and will be completed before the end of Summer 2015.
Photo taken from Tibbetts Road looking northward into the 2-acre site.
The home at the site formerly rested on the other side of the Sugar Maple in the center of the photo.
Behind the maple are approximately 1400 poplar trees that were installed as part of the phytoremediation remedy.
A detail of the phytoremediation trees.
Links to Other Site Information
Newsletters & Press Releases:
Federal Register Notices:
Reports and Studies:
|Five Year Review Report, September 26, 2003 (2.54 MB)   |
|Second Five Year Review Report, August 28, 2008 (4.46 MB)   |
|Summary of Environmental Monitoring 2008, January 1, 2008 (20.6 MB)   |
|Summary of Environmental Monitoring 2011, April 13, 2012 (8.87 MB)   |
|Third Five Year Review Report, August 20, 2013 (6.97 MB)   |
|Overburden Excavation Project Summary, February 10, 2014 (26.31 MB)   |
|Summary of Environmental Monitoring 2014, April 1, 2015 (37.3 MB)   |
Barrington Public Library, 39 Province Lane, Barrington, NH 03825
OSRR Records and Information Center, 1st Floor, 5 Post Office Square, Suite 100 (HSC), Boston, MA 02109-3912 (617) 918-1440
|EPA Remedial Project Manager: ||Darryl Luce |
|Address: ||US Environmental Protection Agency|
5 Post Office Square, Suite 100
Mail Code OSRR07-1
Boston, MA 02109-1367
|Phone #: ||617-918-1336 |
|E-Mail Address: ||email@example.com |
|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: ||firstname.lastname@example.org |
|State Agency Contact: ||Ken Richards |
|Address: ||29 Hazen Drive, P.O. Box 95|
Concord, NH 03302
|Phone #: ||603-271-4060 |
|E-Mail Address: ||email@example.com |