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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 is an 11-acre site that was used as early as the 1920s until 1967 as a municipal disposal area. During this time, the landfill was open to residents and businesses of the Town. In 1967, the Town of Southington closed the landfill. Closure procedures included compacting loose refuse, covering the landfill with at least 2 feet of clean fill material, and reseeding with grasses. Between 1973 and 1980, the landfill was subdivided and sold for residential and commercial development. Several residential and commercial structures were built on the Site and on adjacent areas. The former landfill is located 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 closed because groundwater analyses indicated the presence of volatile organic compounds (VOCs) at levels that exceeded State standards. The well has permanently been closed. The site is located approximately 1,800 feet to the east of the Quinnipiac River.

Threats and Contaminants
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VOCs were detected in the groundwater, soil, and surface water. People could be at risk by coming into direct contact with or accidentally ingesting contaminants in the groundwater or subsurface soil. However a survey was conducted and showed that 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. Black Pond, which abuts the Site and is used for recreation and fishing, has not been significantly impacted by the site contaminants. Some contamination which was found along the southwestern shore of Black Pond was excavated and buried underneath the landfill cap. The Connecticut Department of Health collected and tested fish from Black Pond. The results indicated the fish were healthy and showed no evidence of contamination.

Cleanup Approach
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The site is being addressed in two parts. Part one is the Interim Source Control Remedy which consisted of: permanent relocation of all on-site buildings; construction of a landfill cap over the entire Site; consolidation of a highly contaminated area 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 Interim Source Control Remedy was completed on September 2001. Part two consisted of groundwater sampling for several years after the installation of the landfill cap to determine the effectiveness of the cap and determine off-site nature and extent of the groundwater contamination. The groundwater studies were completed in June 2006. Such studies included the evaluation of groundwater contamination's potential impacts to homes and buildings through vapor intrusion as well as potential impacts to surface water and sediment. After sufficient information was collected, a final groundwater remedy was addressed in the September 2006 Record of Decision. Long term monitoring will continue for at least 30 years following the completion of both the Interim Source Control Remedy and the Final Remedy. The major components of the Final Remedy include: Institutional controls, in the form of Environmental Land Use Restrictions, 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 CT RSRs volatilization criteria to prevent migration of vapors into buildings; vapor barriers or similar technology will be used to control vapors in new buildings; continued groundwater monitoring; conduct operation and maintenance of engineering controls and institutional controls; and the performance of five year reviews.

Response Action Status
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Entire Site The potentially responsible parties completed the site investigation in late 1993. The investigation defined the contaminants and recommended alternatives for the final cleanup. EPA selected an interim cleanup remedy, also referred to as the Interim Source Control Remedy, in the fall of 1994. The interim remedy consists of capping the site; excavating and consolidating a highly contaminated area "hot spot" in a lined cell underneath the landfill cap; removing all buildings from the landfill; installing a soil gas collection/treatment system; and performing long-term monitoring of groundwater and soil gas. The interim remedy design was completed in April 2000 and the interim remedy construction was completed in September 2001. The groundwater and soil gas long term monitoring program is underway and is expected to take place over several years. Information from the ongoing groundwater monitoring program will be used to determine how far contamination in the groundwater has traveled from the Site and whether or not it may be adversely impacting any downgradient natural resource areas. The groundwater monitoring program will be conducted over several years to determine the effectiveness of the landfill cap. The EPA, in consultation with CT Department of Environmental Protection (CT DEP) will evaluate the groundwater information and select a final groundwater remedy, as necessary.

Enforcement HighlightsIn 1987, the EPA issued an Administrative Consent Order to three potentially responsible parties for site contamination. These parties performed an investigation to determine the nature and extent of contamination at the site, determine potential risks to the public and the environment, and evaluate feasible cleanup alternatives. In early 1993, 320 new parties were named as potentially responsible. In 1998, a Consent Decree was issued to all parties for the construction 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, namely Pratt & Whitney and the Town of Southington are the parties that are performing all work at the site for the 1998 Consent Decree. In 2006, the EPA issued the Final Record of Decision. The selected remedy is a comprehensive approach that addresses the remaining risks which are due to vapor intrusion into buildings above groundwater contamination from the landfill.

Environmental Progress
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After adding this site to the NPL, the EPA assessed conditions at the site and determined that contamination from the Old Southington Landfill site currently does not pose an immediate threat to area residents or the surrounding environments, and no emergency actions are necessary. An interim remedy has been implemented for the site which addresses all contaminated media except for groundwater. A final remedy has been selected to address groundwater risks, namely vapor intrusion into buildings due to contaminated groundwater eminating from the landfill. Groundwater will be monitored for at least 30 years to determine the effectiveness of the cap and overall remedy.

Current Site Status
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  • In 1994 EPA selected an interim cleanup remedy, which included capping the site, excavating and consolidating a hot spot in a lined cell, removing all buildings from the landfill, installing a soil gas collection/treatment system and performing long term monitoring. Construction of the interim remedy started in Spring 2000 and was completed in the Fall 2001. Groundwater investigation have been completed at the site and a final remedy has been selected. Long-term groundwater monitoring will continue to assure long term protection to human health and the environment.

    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)  

    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 Renahan
    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: renahan.kate@epa.gov

    State Agency Contact: Gennady Shteynberg
    Address: CT Department of Environmental Protection
    79 Elm Street
    Hartford, CT 06106-5127
    Phone #: 860-424-3283
    E-Mail Address: gennady.shteynberg@po.state.ct.us

    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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    Last updated on Tuesday, September 24th, 2013
    URL: http://www.epa.gov/region1/superfund/sites/oldsouthington