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Waste Site Cleanup & Reuse in New England
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  COAKLEY LANDFILL


Map this site in Cleanups in My Community
 Greenland; North Hampton,  New Hampshire
 Rockingham County
 Street Address: 480 BREAKFAST HILL RD
 Zip Code: 03840, 03862
 Congressional
 District(s):

01
 EPA ID #: NHD064424153
 Site ID #: 0101107
 Site Aliases:

 Site Responsibility: Federal, State, Potentially Responsible Parties

 NPL LISTING HISTORY
 Proposed Date 01/15/1984
 Final Date 06/01/1986

Site Description
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The privately owned Coakley Landfill site is a 92-acre parcel of land that was operated by several municipalities. The landfill area encompasses 27 acres in the southern portion of the site. The site accepted municipal and industrial wastes from the Portsmouth area between 1972 and 1982. Incinerator residue was also accepted from the incineration recovery plant for the Refuse to Energy Project between 1982 and 1985. The primary source of contamination is the landfill itself. Volatile organic compounds (VOCs) and metals are the predominant contaminants found. On- and off-site surface water and groundwater are contaminated. The site is located on a groundwater/surface water divide, and residential wells to the south, southeast, and northeast of the landfill are contaminated with low levels of VOCs. Public water service has been extended to the areas with contaminated wells by the local communities. There are several small commercial facilities and restaurants nearby.

Threats and Contaminants
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On-site groundwater is contaminated with arsenic, phenol, and methyl ethyl ketones; off-site groundwater is contaminated with heavy metals including arsenic, chromium, and lead, and VOCs including benzene, 1,4-Dioxane, tetrahydrofuran, and methyl ethyl ketones. On-site soil and sediments are contaminated with arsenic and lead. Stream sediments contain contaminants such as arsenic and VOCs. Leachate contamination at the site includes VOCs, tetrahydrofuran, and ketones. Metals and VOCs were detected in nearby wetlands. Potential use of the groundwater as a water supply is the main threat to human health.

Cleanup Approach
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Removal and Remedial Actions (involving source control and management of migration).

Response Action Status
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Initial Action In 1989, North Hampton extended a municipal water supply line to residents who had been obtaining their water from 13 private wells contaminated with VOCs. The State set up a residential well monitoring program with an early warning system to detect any groundwater contamination in the area. Local residents now have access to municipal water or other uncontaminated groundwater supplies.

Source Control Source Control is Operable Unit 1 (OU-1) of the remedy. The state conducted an investigation from 1986 to 1987. The goals of the field work were to characterize the hydrogeologic conditions at the site, including an estimate of the total area of the landfill and soil deposits, details of the hydraulic properties of bedrock and selected surface streams, and the identity of pathways for contaminant migration from the site. The state completed the study in 1990. Based on the results of the study, a cleanup remedy was selected in a June 1990 Record of Decision (ROD) that included consolidating approximately 2,000 cubic yards of wetland sediments; consolidating approximately 30,000 cubic yards of on-site solid waste; fencing and capping the landfill; collecting and treating landfill gases by thermal destruction; extracting groundwater and treating it with a combination of chemical, biological, and physical processes; and establishing long-term monitoring and institutional controls. Construction of the cap was completed during the summer of 1998. Passive collection and venting of landfill gases was allowed through the issuance of an Explanation of Significant Differences (ESD) in 1996. An ESD was issued in 1999 and documented the determination that leachate collection and treatment was not needed. Another ESD was issued in 2007 which documented that the Safe Drinking Water Act Maximum Contaminant Level for arsenic was changed from 0.05 mg/l to 0.010 mg/l, introduced tetrahydrofuran as an additional chemical of concern, and documented the EPA Health Advisory for Manganese changed from 0.18 mg/l to 0.3 mg/l.
The Coakley Landfill Group (CLG) installed methane gas alarms in buildings on abutting properties in 2007 and no violations have been reported on those properties since that time. From September 21, 2006 to the present, no methane has been detected above the state standard for methane soil gas (2.5%) at three of the six gas monitoring probes (M-2, M-4, and M-5). For the other three monitoring probes (M-1, M-6, and M-7), sporadic exceedances have been observed. The CLG continues to monitor landfill gas under the oversight of EPA and NHDES.

In 2008 and 2009 additional sediment and surface water samples, respectively, were collected and toxicity tests were run, which showed no significant ecological impact. Since the sampled area was selected as the “worst case area” based on chemistry testing, EPA concluded that it is likely there are no significant ecological impacts in surface water and sediment at the Site. This was documented in July 29, 2009 as an Addendum to the Second 5 Year Review. In 2010, the CLG performed annual chemistry testing of the sediment, surface water and leachate samples and performed a statistical analysis of all the historical data, which ensured that the currently non-toxic concentrations do not show an upward trend.


Management of Groundwater Migration Management of Groundwater Migration is Operable Unit 2 (OU-2) of the remedy. The EPA began a study in 1990 of the migration of contaminants into off-site groundwater and the ecological effects of the site contamination on adjacent wetlands. In the fall of 1994, a groundwater remedy was documented in a second ROD that included imposing institutional controls to prevent the use of contaminated groundwater, allowing groundwater to clean itself through natural attenuation, and long-term monitoring. Negotiations with the potentially responsible parties to undertake the off-site groundwater remedy were successfully completed in 1998. The parties also put institutional controls in place and are presently conducting environmental monitoring on an annual basis. An ESD, issued in 2007 documented that the Safe Drinking Water Act Maximum Contaminant Level for arsenic was changed from 0.05 mg/l to 0.010 mg/l, and the EPA Health Advisory for Manganese changed from 0.18 mg/l to 0.3 mg/l.
In 2008, NHDES approved a Groundwater Management Permit (GMP) application submitted by the Coakley Landfill Group (CLG). With this approval, a Groundwater Management Zone (GMZ) was established. The GMZ delineates the area around the landfill in which contaminated groundwater is being monitored. Properties within the GMZ have either deed restrictions or easements in place to further prevent exposure to the groundwater and/or tampering with the ongoing remedy.


Enforcement HighlightsThe state issued a Consent Order in 1983 requiring the owner to accept only incinerator ash from the Refuse to Energy Project. A Consent Decree was issued in 1992 by which 30 parties agreed to design, construct, and operate the source control remedy. A second Consent Decree was issued in 1999 whereby 28 parties agreed to implement the remedy for management of groundwater.

Environmental Progress
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The provision of an alternate drinking water supply has reduced the potential for exposure to groundwater contamination. Since completion of the landfill cap in 1998, groundwater flow is away from nearby residences and contamination levels are slowly declining (especially for VOCs). However, findings from the most recent Five Year Review (September 2011) suggest that concentrations may exceed the site-specific interim cleanup levels (ICLs) beyond the current GMZ boundary. Hence, additional tests will be performed to evaluate the need for expansion of the GMZ and the need for additional Institutional Controls.

Current Site Status
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Since the agency issued its 1990 source control cleanup plan and its 1994 groundwater cleanup plan for the Coakley Landfill Superfund site, the acceptable level of arsenic in drinking water, aka Maximum Contaminant Level (MCL) has changed from 0.05 mg/l to 0.010 mg/l. The agency changed the arsenic performance standard for the Coakley site to match this new MCL. Additionally, a manganese Health Advisory was issued in 2004 which uses the guidance level of 0.3 mg/l which is now being used for the site. Additionally, since these cleanup plans were issued, the state of New Hampshire has updated its environmental regulations. For the source control cleanup plan, the chemical tetrahydrofuran has been added as an additional chemical of concern because groundwater monitoring detected this contaminant at levels exceeding state standards. These changes have been documented in ESDs issued September 2007 for the source control (OU-1) cleanup and the groundwater (OU-2) cleanup. In 2008 the potentially responsible parties put groundwater institutional controls in place and continue to monitor the groundwater quality at the site on an annual basis until cleanup levels for all contaminants of concern are met.

All the issues described in the 2011 Five Year Review report have been fully resolved except two. Namely, the analysis to determine whether an expansion of the GMZ and the addition of Institutional Controls (ICs) are necessary; and the preparation of an ESD to formally add 1,4-dioxane as a contaminant of concern. The GMZ/IC evaluation is expected to be completed by the end of March 2013, and an ESD issued later in 2013.

The most recent, September 2011 Five Year Review concluded that: [o]verall, the remedy at the Coakley Landfill Superfund Site currently protects human health and the environment in the short-term. Long-term protectiveness has also been achieved at OU-1 based on continued maintenance of the landfill cap, long-term monitoring, and use restrictions being in-place. Long-term protectiveness will also be achieved at OU-2 when interim groundwater cleanup levels for all contaminants of concern are met and restrictions on the use of groundwater within OU-2 can be removed. Monitoring of the site will continue until cleanup levels for all contaminants of concern are met.

Site Photos
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SDMS 454638
Final Landfill Cap

SDMS 495249
View of the landfill capped area in 2011 from the access road past the entrance gate, looking to the South-West

SDMS 495250
Detailed view of the rip-rap on top of the drainage swale at the Northwest corner of the landfill, looking to the South (2011)

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), June 28, 1990 (990 KB)  
Administrative Record Index, Explanation of Significant Differences (ESD) for Operable Unit (OU) 1, March 22, 1991 (461 KB)   
Administrative Record Index, Operable Unit (OU) 01 Fourth and OU 2 Fifth Explanation of Significant Differences (ESD), September 28, 2007 (264 KB)  

Reports and Studies:
Five Year Review Report, September 25, 2001 (873KB)  
Second Five Year Review Report, September 21, 2006 (11.16 MB)   
Addendum to Second Five Year Review Report, July 29, 2009 (308 KB)   
Third Five Year Review Report, September 22, 2011 (18.89 MB)  

Decision Documents:
View Records of Decision (RODS) on-line (EPA HQ)  
Fourth Explanation of Significant Differences (ESD) for Operable Unit 1, September 28, 2007 (1.43 MB)  
Explanation of Significant Differences (ESD) for Operable Unit 2, September 28, 2007 (1.49 MB)  
Second Explanation of Significant Differences, OU2, July 01, 2009 (1.12 MB)  
Re-Issued Fourth Explanation of Significant Differences, OU1, July 01, 2009 (1.32 MB)  
Institutional Controls for this Site  

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

Site Repositories
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North Hampton Public Library, 237-A Atlantic Avenue, North Hampton, NH 03862

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: Gerardo Millan-Ramos
Address: US Environmental Protection Agency
5 Post Office Square, Suite 100
Mail Code OSRR07-1
Boston, MA 02109-3912
Phone #: 617-918-1377
E-Mail Address: millan-ramos.gerardo@epa.gov

EPA Community Involvement Coordinator: Rudy Brown
Address: US Environmental Protection Agency
5 Post Office Square, Suite 100
Mail Code ORA01-1
Boston, MA 02109-3912
Phone #: 617-918-1031
E-Mail Address: brown.rudy@epa.gov

State Agency Contact: Andrew J. Hoffman
Address: New Hampshire Department of Environmental Services
PO Box 95, 6 Hazen Drive
Concord, NH 03302-0095
Phone #: 603-271-6778
E-Mail Address: ahoffman@des.nh.gov

 


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