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Waste Site Cleanup & Reuse in New England
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  OLD SOUTHINGTON LANDFILL


Map this site in Cleanups in My Community
 Southington,  Connecticut
 Hartford County
 Street Address: OLD TURNPIKE RD
 Zip Code: 06487
 Congressional
 District(s):

01
 EPA ID #: CTD980670806
 Site ID #: 0100251
 Site Aliases:

 Site Responsibility: Potentially Responsible Parties

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

Site Description
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The Old Southington Landfill Site (Site) is an 11-acre landfill that was owned and operated by the Town of Southington (Town) from 1920 until 1967 as a municipal disposal area. The Site received residential, commercial, and industrial waste. The northern part of the landfill typically received residential waste and construction type debris from nearby construction sites. The southern part of the landfill typically received commercial and industrial waste. Trucks from Solvents Recovery Service were seen dumping sludge materials into Semi-Solid Disposal Area 1 (SSDA1) and Semi-Solid Disposal Area 2 (SSDA2), located on the southern part of the landfill close to the edge of Old Turnpike Road; at the end of each day, those areas would be covered with a thin layer of soil.


Landfill closure procedures included compacting loose refuse, covering the Site with at least 2 feet of clean fill material, and reseeding with grass. Between 1973 and 1980, the landfill was subdivided and sold into residential and commercial parcels. Four residential homes were built on the northern end of the landfill and six commercial buildings were built on the southern portion. The Site abuts a residential area located to the north and east, and abuts commercial property to the west and south. Black Pond is part of the Site and is adjacent to the landfill's northeast boundary. The Site is located approximately 1,800 feet east of the Quinnipiac River and approximately 700 feet southeast of the former municipal Well No. 5, which was installed in 1971 by the Town of Southington Water Department as a public water supply. In 1979, the municipal well was permanently closed because groundwater analyses conducted by CT Department of Public Health indicated the presence of volatile organic compounds (VOCs) at levels that exceeded State standards. Currently everyone within a two mile radius of the Site is connected to municipal water from another municipal water source that is regularly tested and shown to be clean.

Threats and Contaminants
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The Site does not presently pose a risk to human health or to the environment. A Remedial Investigation, Human Health Risk Assessment, Ecological Risk Assessment, and Feasibility Study have been conducted resulting in an Interim Source Control Remedy and a Final Vapor Intrusion Remedy which prevent the public from coming in contact with Site related contamination, including vapor intrusion. In addition, a survey showed no private drinking water wells are in use within a 2 mile radius of the Site. The landfill has also been covered with an impermeable cap which provides a barrier to the subsurface soils in the landfill. The soil gas collection system and soil gas impermeable barrier control landfill gases. Black Pond, which abuts the Site and is used for recreation and fishing, has not been significantly impacted by Site contaminants. Some contamination found along the southwestern shore of Black Pond was excavated and buried underneath the landfill cap. Two sets of fish testing from Black Pond were conducted by the Connecticut Department of Health and the responsible parties; both sets of fish testing results indicated that the fish were healthy and showed no evidence of contamination.

Cleanup Approach
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The Site was addressed in two parts. The Interim Source Control Remedy (Interim Remedy), completed on September 2001, consisted of: permanent relocation of all on-Site buildings; construction of a landfill cap over the entire Site; consolidation of SSDA1 in a lined cell underneath the cap and above the water table; installation of a soil gas collection system; and implementation of a long term monitoring program for groundwater and soil gas. The Final Vapor Intrusion Remedy (Final Remedy) is an ongoing remedy that addresses potential vapor intrusion impacts from groundwater migrating from the Site to downgradient buildings. The major components of the Final Remedy include: implementation of Institutional controls in the form of Environmental Land Use Restrictions (ELURs) on properties or portions of properties where vapor intrusion from groundwater pose a potential risk to human health; building ventilation (sub-slab depressurization systems) in existing buildings located in areas where volatile organic compounds in groundwater exceed state volatilization criteria to prevent migration of vapors into buildings; installation of vapor barriers or similar technology to control vapors in new buildings; continued groundwater monitoring; operation and maintenance of engineering controls and institutional controls; as well as the continuing with the five year reviews (FYRs).

Response Action Status
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Entire Site The Site was listed on EPA's National Priority List (NPL) on September 21, 1984. By 1993, the potentially responsible parties (PRPs) with EPA and CT Department of Environmental Protection (CT DEP) oversight, completed the Site Remedial Investigation to define the nature and extent of contamination, the Human Health Risk Assessment and Ecological Risk Assessment, and the Feasibility Study.
In the fall of 1994, EPA finalized a Record of Decision (ROD) that selected an interim cleanup remedy, also referred to as the Interim Source Control Remedy (Interim Remedy). The Interim Remedy consisted of permanent relocation of all residences and businesses from the landfill Site; capping the Site; excavating and consolidating (SSDA1) in a lined cell underneath the landfill cap and above the groundwater table; installing a soil gas collection system; performing long-term monitoring of groundwater and soil gas; implementing institutional controls to prevent digging and damaging the cap; conducting five year reviews (FYRs); and conducting operation & maintenance of the cap and all of its appurtenances. In addition, the Interim Remedy required additional groundwater studies to be performed to determine if the landfill contamination was adversely impacting human health and/or natural resource areas downgradient of the Site. The Interim Remedy design of the cap was completed in April 2000 and the respective construction was completed in September 2001.

Following completion of additional groundwater studies, in 2006, a second ROD was finalized by the EPA selecting the final Site remedy which addressed and prevented vapor intrusion from adversely impacting down gradient off-site buildings. This remedy includes implementing institutional controls at two properties across the street and downgradient from the landfill (Chuck & Eddy's Salvage Yard and the Radio Station). In addition, EPA continues to perform its FYRs to determine if the overall remedy remains effective and protective of human health and the environment.


Enforcement HighlightsIn 1987, the EPA issued an Administrative Consent Order to three potentially responsible parties for Site contamination. In early 1993, 320 new parties were named as potentially responsible. In 1998, a Consent Decree was issued to all parties for the construction and payment of the Interim Remedy as well as for the performance of future groundwater studies for the site. Due to varying degrees of liability, such parties, through the Consent Decree, have contributed to the cost of Site clean up. However, only two parties, Pratt & Whitney and the Town of Southington, are performing work pursuant to the 1998 Consent Decree.

Environmental Progress
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The Interim Remedy for the cap, along with its appurtenances, as well as the Final Remedy for vapor intrusion have been implemented, with the exception of the completion of some institutional controls which are currently underway. A single low-permeability layered cap was constructed over the northern portion of the landfill where residential waste and construction type debris were placed. This area has been developed as a passive recreational area and is open to the public. People are allowed to canoe and fish in Black Pond which is located in the northeastern part of the Site. In addition, an impermeable soil gas barrier has been constructed below ground surface and along the northern perimeter of the landfill which prevents potential landfill gases from migrating off-site to the neighborhood located north of the Site.

A double low-permeability layered cap was built on the southern portion of the landfill where commercial and industrial waste was brought. The southern portion of the landfill is completely fenced in to prevent unauthorized trespassing and damage to this cap. A highly contaminated area referred to as Semi-Solid Disposal Area 1 (SSDA1) was excavated and consolidated in a lined cell underneath the southern cap and above the groundwater table.

Landfill gas vents were built as part of the caps and are designed to release landfill gases safely into the atmosphere. These gas concentrations are very low and do not pose a risk to human health or the environment. EPA in consultation with the Connecticut Department of Energy & Environmental Protection (CT DEEP) continues to oversee the PRPs' long-term groundwater monitoring program which evaluates the effectiveness of the cap and overall remedy. Further, EPA continues to perform its FYRs to assess the continued effectiveness and protectiveness of the entire remedy. EPA is conducting its third FYR this year and the report will be available to the public by October 2015.

Current Site Status
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  • All landfill-related risks have been addressed at the Site and surrounding area. All on-Site structures have been permanently relocated from the Site. The landfill caps prevent contact with contamination that was placed at the landfill. Gases at the landfill are properly handled through the landfill gas collection system and impermeable soil gas barrier located along the northern perimeter of the landfill. The fish at Black Pond have been tested twice: once by CT Department of Public Health; and a second time by the PRPs with CT and EPA oversight. Both sets of tests found the fish to not to pose a risk to human health. People within a two mile radius of the Site are connected to municipal water. A sub-slab vapor barrier was installed at a newly built maintenance building at the Chuck & Eddy's Salvage Yard property as required by the 2006 ROD to prevent potential landfill VOCs from potentially migrating from the landfill into new buildings. The PRPs are currently working with the property owners of Chuck & Eddy's Salvage Yard and the Radio Station, which are located immediately across the street and downgradient of the Site, to implement institutional controls which require that any new building or addition to an existing building have a sub-slab vapor barrier and vapor intrusion engineering controls to prevent potential soil gas vapors from migrating into new buildings. This work is in progress. EPA, in consultation with CT DEEP, is conducting its third FYR to assess if the Site remedies continue to be effective and protective. The report will be made available to the public by October 2015.

    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, Record of Decision (ROD), September 1994 (507 KB)  
    Administrative Record Index, Final Record of Decision (ROD), Operable Unit 2, September 29, 2006 (580 KB)  

    Reports and Studies:
    Hydrogeologic Review of Supplemental Remedial Investigation (RI) Report, April 15, 2005 (65 KB)  
    Five Year Review Report, September 13, 2005 (6.6MB)  
    Supplemental Remedial Investigation (RI) Report, May 05, 2006 (14.18 MB)   
    Combustible Gas Comprehensive Summary Report for 2003 to 2004, May 06, 2006 (3.42 MB)  
    Risk Assessment for Gas Vent VOC Data – Revision 1.1, June 14, 2006 (961 KB)  
    Amended Feasibility Study (FS), June 1, 2006 (15.7 MB)  
    Approval of Supplemental Remedial Investigation (RI) Report, June 19, 2006 (64 KB)  
    Approval of Risk Assessment for Gas Vent VOC Data – Revision 1.1, June 19, 2006 (16 KB)  
    Proposed Plan, June 2006 (7 MB)  
    Revised Remedial Investigation/Feasibility Study (RI/FS) Volumes 1 - 3, December 10, 1993 (Opening file 32.6 MB with links to other PDF files)  
    Second Five Year Review Report, September 29, 2010 (3.21 MB)  
    Letter with EPA Approval of 07/2012 Vapor Intrusion Groundwater Investigation Report, July 11, 2014, (2.01 MB)  
    Letter with CT Dept of Energy and Environmental Protection (CT DEEP) Recommendation for Approval of 07/2012 Vapor Intrusion Groundwater Investigation Report, July 16, 2013, (797 KB)  
    07/2012 Vapor Intrusion Groundwater Investigation Report - Revised 10/2014, October 1, 2014, (35.3 MB  

    Decision Documents:
    View Records of Decision (RODS) on-line (EPA HQ)  
    Record of Decision (ROD), Operable Unit 2, September 29, 2006 (6.2 MB)  
    Institutional Controls at this site  

    Settlement Documents:
    Unopposed Motion to Enter Consent Decree, May 14, 1999 (239 KB)  
    Unopposed Motion to Enter Consent Decree, June 1, 1999 (1.91 MB)  
    Unopposed Motion to Enter Consent Decree, June 1, 1999 (1.86 MB)  
    Consent Decree, June 12, 1998 (8.65 MB)  
    Consent Decree for Remedial Design and Remedial Action, November 24, 2009 (7.72 MB)   

    Other Links:
    NPL Site Narrative at Listing:  
    Site Progress Profile  
    Deminimis Consent Decree, November 24, 2009 (5.48 MB)  

    Site Repositories
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    Southington Public Library, 225 Main Street, Southington, CT 06489

    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: Almerinda Silva
    Address: US Environmental Protection Agency
    5 Post Office Square, Suite 100
    Mail Code: OSRR07-4
    Boston, MA 02109-3912
    Phone #: 617-918-1246
    E-Mail Address: silva.almerinda@epa.gov

    EPA Community Involvement Coordinator: Kate Melanson
    Address: US Environmental Protection Agency
    5 Post Office Square, Suite 100
    Mail Code: ORA01-4
    Boston, MA 02109-3912
    Phone #: 617-918-1491
    E-Mail Address: melanson.kate@epa.gov

    State Agency Contact: Stephen Gaura
    Address: CT Department of Environmental Protection
    79 Elm Street
    Hartford, CT 06106-5127
    Phone #: 860-424-3786
    E-Mail Address: steve.gaura@ct.gov

    EPA Site Attorney Ruthann Sherman
    Address: US Environmental Protection Agency
    5 Post Office Square, Suite 100
    Mail Code: OES04-2
    Boston, MA 02109-3912
    Phone #: 617-918-1886
    E-Mail Address: sherman.ruthann@epa.gov

     


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