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Waste Site Cleanup & Reuse in New England
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  KEARSARGE METALLURGICAL CORP.


Map this site in Cleanups in My Community
 Conway,  New Hampshire
 Carroll County
 Street Address: MILL ST., now referred to as HOBBS STREET
 Zip Code: 03818
 Congressional
 District(s):

01
 EPA ID #: NHD062002001
 Site ID #: 0101105
 Site Aliases:

 Site Responsibility: State

 NPL LISTING HISTORY
 Proposed Date 09/08/1983
 Final Date 09/21/1984

Site Description
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Precision stainless steel castings were manufactured by the Kearsarge Metallurgical Corporation (KMC) from 1964 until the company went out of business in 1982. Of the 9+ acre area that the site covers, KMC currently owns 4-acres; the remaining 5-acres have different ownership but are included within the site boundaries. The wastes produced from the cast-making processes (casting, cleaning, finishing, and pickling) initially were disposed of on site. During the 1970s and 1980s, some of these wastes were drummed and stored on site. A large, 20-foot-high pile of approximately 9,000 cubic yards of solid waste was located behind a foundry building and surrounded by a chain link fence. This waste pile contained ceramic sand, scrap metal, rusted drums, and various other refuse from foundry operations, and extended across the Kearsarge property line. Two municipal wells are located approximately 3,000 feet north of the site and supply most of the drinking water to the Town of Conway. Pequawket Pond marks the southern boundary of the site and is used for recreational purposes. Approximately 8,100 people live within 3 miles of the site, and 2,700 people within 3 miles of the site use groundwater in the area for drinking purposes.

Threats and Contaminants
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The groundwater is contaminated with volatile organic compounds (VOCs) including trichloroethane (TCA). The soils in the woodlands area east of the site and in the drainage way area were contaminated with low levels of VOCs, chromium, copper and nickel, and silica dust. VOCs were detected in off-site surface water, primarily in the swampy area to the east of the site and the catch basins. There was the potential for exposure to VOCs by inhalation and ingestion of the dusts and dirt from the site. The town's drinking water supply is not contaminated; however, the possibility exists that the site may contribute groundwater to the municipal wells during periods of low recharge and high pumping rates. Residents could be exposed through direct contact with the contaminated groundwater.

Cleanup Approach
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Initial and long-term response actions.

Response Action Status
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Initial Action Prior to 1991, the site owner arranged for the removal of 300 drums from the site. In addition, 23 monitoring and observation wells were installed. The wells supplemented the eight monitoring wells previously installed by the State of New Hampshire. Seventeen test pits were excavated and solid waste samples were collected from drums. Three rounds of groundwater samples were also collected. Surface water and sediment samples were collected from the Pequawket Pond. In 1991, six additional drums and two pails of hazardous materials were removed from the site.

Waste Pile Following investigations by the State in 1990, the waste pile was surrounded by a chain link fence to secure the area. As a pilot for the Superfund Accelerated Cleanup Model (SACM) initiative, removal of the waste pile began in the summer of 1992 and was completed in the fall of 1992. This quick response cleanup action resulted in the following: the excavation, transportation, and disposal of approximately 13,620 tons of waste pile material to a municipal solid waste landfill; the transportation and disposal of the contents of the septic tank in fourteen 55-gallon drums to a hazardous waste incinerator; and the excavation, transportation, and disposal of approximately 12 cubic yards of leach field soils and associated concrete septic tank to a hazardous waste landfill.

Groundwater prior to 2004 Construction of the groundwater pump and treat facility began in the spring of 1993. By the fall of 1993, the facility was operational, pumping approximately 42 gallons per minute. To control migration of contaminated ground water, the water was extracted and treated in a clarifier to remove heavy metals, air stripped to remove VOCs, and passed through a carbon filter to adsorb the airborne contaminants. At that time, the groundwater cleanup was expected to take 10 years to achieve the appropriate cleanup levels. In November, 2000, a 75 foot extraction trench was installed behind the former KMC facility in an attempt to more effectively capture the highest groundwater contamination.

Source Removal Additional source material was removed from behind the former KMC building between October 2003 and January 2004. The source material was located at a depth of 8 to 14 feet below ground surface. Approximately 5,670 tons of contaminated soil was shipped to an approved landfill in NH.

Groundwater after 2004 A new groundwater extraction trench and well were constructed as part of the 2004 source removal. This system was extracting contaminated groundwater at an average rate of 6 gallons per minute from 2004 to December 2005. The treatment plant was shut down by NHDES in December 2005. Groundwater monitoring data in 2006 and 2007 shows that progress was made in cleaning up the groundwater in the area behind the KMC facility. The former Hobbs Street extraction wells were shut down as monitoring demonstrated that this area was cleaned up. Monitoring of the groundwater continues to performed by NHDES.

Institutional Controls The 1990 Record of Decision (ROD) for the site did not include Institutional Controls (ICs). Groundwater contamination underlies a 1/2 acre portion of the KMC property. The State of New Hampshire obtained an order from the New Hampshire Superior Court that allowed the state access to the abandoned KMC and OCR properties and to restrict activity and use on the properties "as may be necessary to protect the public health and the environment from hazardous wastes and materials disposed of in the soil and groundwater." That order was established in early 2010 and continues to be in effect.

2012 Focused Feasibility Study In January 2012 EPA produced a Focused Feasibility Study (FFS) that found that greater than 99% of the site contamination had been removed and that the remaining contamination could be addressed by natural processes in a similar time-frame compared to the present groundwater pump-and-treat remedy.

2012 Record of Decision Amendment On September 18, 2012, the Director of the Office of Site Remediation and Restoration signed the Record of Decision Amendment. This changed the groundwater remedy from pump-and-treat to monitored natural attenuation, changed the cleanup levels for two contaminants, and changed the restrictions on land use at the property.

Environmental Progress
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All construction activities have been completed at the KMC site. The removal of drums, a septic tank, contaminated leach field soils, and materials in two waste pits reduced the immediate threat of exposure at the site. Following shutdown of the groundwater extraction and treatment system in 2005, long-term monitoring of groundwater has demonstrated that concentrations remain above cleanup levels in only a small (0.5 acre) portion of the Site.

Current Site Status
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Long-term groundwater monitoring has continued through the winter of 2012. A five-year review of the remedy performance was completed in 2008. The overall protectiveness was deferred until further information was obtained to evaluate the potential for a remedy change to Monitored Natural Attenuation (MNA), whether vapor intrusion was or was not an issue at the Site, and institutional controls had been established. The MNA evaluation was completed in 2012 (see Focused Feasibility Study). The vapor intrusion issue was evaluated in 2008 and in the 2012 Focused Feasibility Study and those evaluations found that there was no risk from vapor intrusion exposures to workers who may occupy a building that overlies the contaminant plume, but that a risk may exist for any homes constructed over the contaminated plume. The five-year review identified the need for institutional controls to protect human health through restrictions on the use of the groundwater underlying two abandoned properties (the KMC and OCR parcels). The State of New Hampshire resolved the ownership issues through action in the New Hampshire Superior Court so that institutional controls in the form of activity and use restrictions can be placed on the deeds of the two properties. The court order went into effect in April 2010. In June 2010, based on the establishment of Institutional Controls, EPA issued a 5-Year Review Addendum revising the protectiveness statement for Operable Unit 2 to find the remedy protective in the short-term because of the Institutional Controls and drinking water service to the area. On September 18, 2012, EPA changed the groundwater remedy from pump-and-treat to monitored natural attenuation. In September 2012, the Town took ownership of the property and is moving forward with efforts to sell the property for commercial or industrial re-use. Monitoring will continue at the site.

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  

Administrative Records:
Administrative Record Index, OU 01 Record of Decision (ROD), September 28, 1990 (722 KB)  
Administrative Record Index, OU02 Explanation of Significant Differences (ESD), September 1, 2003 (205KB)   
Administrative Record Index, OU 01 Explanation of Significant Differences (ESD), April 1, 2010 (112 KB)  
Administrative Record Index, Record of Decision (ROD) Amendment, September 18, 2012 (392 KB)  

Reports and Studies:
Reuse Assessment, September 2004 (747KB)  
Final Report, Technical Assistance for Kearsarge Metallurgical, December 1, 2009 (1.76 MB)  
Updated Summary for the Site Conceptual Model for Groundwater Contamination, May 15, 2009 (17.2 MB)  
Focused Feasibility Study (FS) Report, January 2012 (2.49 MB)  
Proposed Plan for Amended Record of Decision (ROD), May 8, 2012 (7.10 MB)  
Five Year Review Report, July 8, 1998 (329KB)  
Second Five Year Review Report, September 30, 2003 (1,284KB)  
Third Five Year Review Report, September 26, 2008 (8.7 MB)  
Addendum to Third Five Year Review Report, June 17, 2010 (145 KB)  
Fourth Five Year Review Report, September 5, 2013 (4.81 MB)  

Decision Documents:
View Records of Decision (RODS) on-line (EPA HQ)  
Record of Decision (ROD), September 28, 1990 (2,456KB)  
Explanation of Significant Differences (ESD), September 29, 2003 (1, 041KB)  
Explanation of Significant Differences (ESD), OU 01, April 19, 2010 (1.38 MB)  
Record of Decision (ROD) Amendment, September 18, 2012 (4.01 MB)  

Settlement Documents:
Recorded Order Regarding Institutional Controls for Kearsarge Metallurgical - Case Number 212-2009-CV-00162, March 12, 2010 (116 KB)  

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

Site Repositories
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Conway Public Library, Main Street, Conway, NH 03813

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: Darryl Luce
Address: US Environmental Protection Agency
5 Post Office Square, Suite 100
Mail Code OSRR07-1
Boston, MA 02109-3912
Phone #: 617-918-1336
E-Mail Address: luce.darryl@epa.gov

EPA Community Involvement Coordinator: Rodney Elliott
Address: US Environmental Protection Agency
New England Regional Laboratory
11 Technology Drive
Chelmsford, MA 01863-243
Phone #: 617-918-8372
E-Mail Address: elliott.rodney@epa.gov

State Agency Contact: Andrew Hoffman
Address: 29 Hazen Drive
Concord, NH 03301
Phone #: 603-271-6778
E-Mail Address: andrew.hoffman@des.nh.gov

 


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