Durham Meadows
Durham (Central Remediation District)

The Durham Meadows NPL Site is located on Main Street in Durham and includes the Durham Manufacturing Company, the Former Merriam Manufacturing Company, and the surrounding area. The site was listed on the NPL in October 1989. Solvents released by these two manufacturers of metal boxes have caused continuing contamination of soil, groundwater, and a number of nearby private drinking water wells. The Durham Manufacturing Co. and the State of Connecticut maintain water treatment systems at each contaminated well to ensure a safe supply of potable water. In 1998, Merriam Manufacturing closed after a fire destroyed the plant. The company ceased to meet its responsibilities for cleanup of contamination. EPA has taken over the lead role for remediation at this site. In 2005, the EPA issued a Record of Decision that requires removal of contamination at Durham Manufacturing Company and Former Merriam Manufacturing Company and the supply of public water supply from the City of Middletown. Durham Manufacturing Company will proceed with additional sampling on its property in February and March of 2008 and initiate design and installation of a sub-slab depressurization system under its manufacturing building. After completion of sampling, EPA will seek to recommence negotiations with Durham Manufacturing Company to settle its CERCLA liabilities.

Gallup’s Quarry
Plainfield (Eastern Remediation District)

Gallup's Quarry is a 29-acre abandoned gravel pit in a rural, residential area on Tarbox Road in Plainfield. In the 1970s, the site accepted chemical wastes without a permit. DEP and State Police removed waste drums and contaminated soils from the site in 1978. EPA added the site to the NPL in October 1989. No soil contamination remains on site at concentrations greater than State remediation standards. Several volatile organic compounds remain in groundwater on the site and at several downgradient properties at concentrations greater than State remediation standards. No drinking water wells have been affected by contamination from the site. The 1997 ROD selected monitored natural attenuation and recording of environmental land use restrictions (ELURs) under State law as the remedy for the groundwater. The potentially responsible parties continue to monitor groundwater, soil, and surface water to assess the progress of cleanup. ELURs have been recorded for the site and for four of five downgradient properties. The owner of the fifth downgradient property has agreed to record an ELUR, and DEP is working with the site owner and the potentially responsible parties to ensure that the ELUR is recorded. A wood-burning power plant has been proposed for the site, and DEP has entered into a Covenant Not To Sue with the site owner. EPA completed five-year reviews for the site in September 2002 and September 2007.

Kellogg-Deering Well Field
Norwalk (Southwestern Remediation District)

The Kellogg-Deering Well Field Superfund Site in Norwalk was added to the National Priority List (NPL) in 1984. The site was proposed for addition to the NPL after the Norwalk First Taxing District detected solvents in their drinking water wells. The primary contaminant of concern at this site is trichloroethylene (TCE). When TCE was detected in the public drinking water wells, the wells were shut down until adequate treatment could be installed. Once added to the NPL, EPA identified the source area and required the responsible parties to investigate and remediate the sources of pollution that were impacting the Kellogg-Deering Well Field. In 1996, the remedy for the source areas became operational. The remedy includes a groundwater pump-and-treat system, which prevents the TCE-contaminated groundwater from impacting the well field, and a soil vapor extraction (SVE) system. The SVE system operated until 2000 to reduce the concentration of TCE and other solvents from the soil. In 2006, soil that remained on-site and that was deemed a risk to groundwater quality was excavated and disposed off-site. The groundwater remedy continues to operate. In addition, EPA is investigating the potential risk to the neighborhood near the source area from the TCE-contaminated groundwater. EPA continues to manage this project and to conduct the required Five-Year Reviews (next review scheduled for September 2012).

Laurel Park Landfill
Naugatuck (Northwestern Remediation District)

The Laurel Park Landfill site occupies approximately 20 acres of a 35-acre parcel in southern Naugatuck. The landfill has been in existence since the late 1940s, and several industries disposed of solvents, oils, hydrocarbons, chemical and liquid sludge, chemical solids, tires, and rubber products there. The facility continued to operate as a municipal landfill until 1987. The surrounding area varies from suburban to rural residential. Homes in the area are now served by public water, which was extended in 1989 after private drinking water wells were found to be contaminated. The site was listed on the NPL in 1983. The site was capped in 1997 by the responsible parties (PRPs), the Laurel Park Coalition. Ongoing activities include groundwater monitoring, inspections, and monitoring of leachate discharges. The most recent Five Year Review of the site was completed in September 2003. The PRPs are currently working on implementing institutional controls for this site.

Linemaster Switch
Woodstock (Eastern Remediation District)

The 92-acre Linemaster Switch Corporation site is located in a rural, residential area on Plaine Hill Road in Woodstock. The company has manufactured electrical and pneumatic foot switches and wiring harnesses since 1952 and remains in active operation. TCE was released to soil beneath and adjacent to the factory building, resulting in contamination of soil and groundwater. The site and surrounding area rely on private wells for drinking water. The TCE released from the site has caused contamination of the drinking water well serving the site and of drinking water wells at several adjacent properties. An air stripper is used to treat water from the onsite well and to provide a source of clean water to the site. EPA added the site to the NPL in 1990. In July 1993, EPA selected a remedy including the use of a groundwater pump and treat system to prevent contaminated groundwater from flowing off the site toward adjacent properties. This system has limited the spread of contaminated groundwater and continues to operate. Single- and dual- phase vapor extraction systems have been used at the site in an attempt to remediate soil at the site. However, these systems have proven ineffective because they have not been able to draw vapors through the dense glacial till that overlies bedrock at the site. The site owner continues to sample groundwater at the site as well as at domestic wells in several adjacent properties. Environmental Land Use Restrictions to limit the use of groundwater on the site and several adjacent properties were recorded on the Woodstock land records in January 2005. EPA completed a Five Year Review for the site in May 2004.

Naval Submarine Base
Groton/Ledyard (Eastern Remediation District)

The 687- acre base is located in Groton and Ledyard and consists of over 300 buildings. The Navy has owned the site since 1866 and has based submarines at the site since 1916. The base serves as a homeport for Seawolf and Los Angeles class attack submarines. The base also houses medical and training facilities, submarine maintenance facilities, housing and recreational facilities, as well as command and administrative functions. The Navy has been addressing soil, groundwater, surface water, and sediment contamination at the site since 1980 under various Department of Defense cleanup programs. The base was added to the NPL in August 1990. The Navy is addressing approximately 25 separate sites within the base under CERCLA and under the Department of Defense Installation Restoration Program. The Navy and EPA both sign a record of decision (ROD) for each site to document the selected remedy. These agencies are required to seek the State’s concurrence with each remedy that is selected. The State has concurred with each of the RODs that the Navy has put in place to date. The Navy has put remedies in place at a majority of these sites and, in many cases, is conducting maintenance and groundwater monitoring. The Navy is currently evaluating remedial options for sediment in the Thames River and for groundwater at several sites on the lower portion of the base adjacent to the Thames River. The Navy is also evaluating remedial options for pesticide- and metal-impacted sediment in an approximately 20-acre wetland.

Old Southington Landfill
Southington (Central Remediation District)

The Old Southington Landfill (OSL) Federal Superfund Site encompasses 13 acres within the Quinnipiac River Basin in the Town of Southington. The Quinnipiac River lies 3,000 feet west of OSL. The site is bounded by industrial-commercial and residential properties. OSL received both domestic and industrial waste between 1920 and 1967. Solvents, oils, petroleum hydrocarbons, chemical and liquid sludge, chemical solids, and other wastes were deposited above and below the water table in wetland and non-wetland areas just west of Black Pond. Historic onsite activities have impacted groundwater at variable depths and distances from the site. Groundwater quality for the area between OSL and the Quinnipiac River is designated GB. Public water supply is available within the area. Evaluation of the groundwater plumes of volatile organic compounds is ongoing. Several measures to control human and ecological exposure to polluted soils and groundwater have been implemented. The landfill has been capped, the landfill perimeter is fenced, and access to the area is restricted. Homes and industrial / commercial properties formerly located within the footprint of the landfill have been removed and relocated. Ongoing activities include supplemental investigations of areas with potential discharges from deep plumes of contaminated groundwater, monitoring and evaluation of the landfill cap’s effectiveness, vapor intrusion monitoring, and landfill inspections.

Precision Plating (State lead site)
Vernon (North Central Remediation District)

Precision Plating has operated from 1970 to the present at the 17.7-acre Hillside Industrial Park at 1050 Hartford Turnpike. Precision Plating is a small metals finishing facility that generates chromium related waste and wastewater. In 1979, an AST and three 55-gallon drums containing chromium waste were damaged behind the Precision Plating building, releasing their contents. The area surrounding Precision Plating is rural and residential, with the properties near the site relying on private drinking water wells. An Order was issued in 1986 to excavate impacted soil, install monitoring wells, and provide potable water to impacted residences. The site was listed on the NPL in 1989. The municipal water system has been extended throughout the area to connect the impacted residences. In 1998, the EPA signed the Precision Plating Superfund Site over to the DEP as the lead organization. Following significant soil removal, chromium still exists at high concentrations in the groundwater, indicating the entire source has not been removed. The most recent activities at the site include investigation of the potential source of the ongoing groundwater contamination.

Raymark Industries
Stratford (Southwestern Remediation District)

Raymark Industries, located at 75 East Main Street, manufactured friction products such as brakes and clutches on this property from about 1919 through 1989. The manufacturing process included the mixing of asbestos, heavy metals and resins to form the friction material. Waste generated in the manufacturing process (e.g., off-specification products, milling/cutting dust, process water) was collected in on-site lagoons. As a lagoon filled, flow was diverted to another and the full lagoon was dewatered and excavated. Excavated waste was used to fill low laying portions of the property and offered as fill off-site. The Raymark NPL site is divided into 9 Operable Units in various stages of investigation and remediation.

Scovill Industrial Landfill
Waterbury (Northwestern Remediation District)

The Scovill Industrial Landfill consists of 30 acres in western Waterbury, off Meriden Road. The Scovill Manufacturing Company used this area as a landfill from 1919 to the mid-1970s for disposal of ash, cinders, demolition debris, and other wastes it generated. The surrounding area is densely developed with mixed commercial and residential uses. The site itself is similarly developed, except for the northern 7 acres, known as the Calabrese parcel which is currently vacant. Public water is available to the site and all surrounding properties. The Calabrese parcel was being developed in 1989 when industrial wastes were exposed, leading to DEP orders and a DEP removal action in 1998. The site was listed on the NPL in August 2000. The initial phase of the remedial investigation (RI) was conducted by EPA in 2002. The second phase of the RI was begun by Saltire, Inc. (successor to Scovill), in 2004. EPA is currently completing the RI as fund-lead following Saltire’s bankruptcy. The primary soil contaminants at the site are PAHs and metals, with PCBs and VOCs present in localized areas. Significant groundwater contamination has not been found, although the groundwater investigation thus far has been limited.

Solvents Recovery Service
Southington (Central Remediation District)

The Solvent Recovery Services of New England (SRSNE) NPL site occupies approximately 14 acres in Southington. SRSNE operated from 1955 to 1991, during which time it received and re-processed millions of gallons of spent solvents and waste petroleum fuels. Faulty operating practices resulted in significant contamination of the land, groundwater, and air and potentially contributed to the shutdown of two nearby public water supply wells in 1979 and 1980. The surrounding area varies from residential to commercial. Homes in the area are now served by public water. The site was listed on the NPL in September 1983. Investigation and remediation site activities continue to be conducted by a group of Responsible Parties consisting of companies that shipped wastes to SRSNE. In 1999, remaining structures at the site were decontaminated and destroyed. Response measures include installation of groundwater containment systems to intercept and treat contaminated groundwater at the site. These containment systems, installed in 1995 and 1999, continue to be operated and monitored. In 2005, EPA issued a Record of Decision calling for a remedial action that includes in-situ removal of solvents embedded in the overburden soils at the site. Negotiations are now proceeding between the EPA and the responsible parties to finalize a Consent Decree and initiate the remedial action.

Yaworski Waste Lagoon
Canterbury (Eastern Remediation District)

The Yaworski Waste Lagoon is located on Packer Road in a rural area of Canterbury, in the floodplain of the Quinebaug River. From about 1948 to 1973 the lagoon received drummed material and bulk wastes including textile dyes, solvents, resins, acids, caustics, still bottom sludge, and solvent-soaked rags. After 1973, the lagoon was dewatered and backfilled. The lagoon is located on the same property as the Yaworski Landfill State Superfund Site, but the landfill is not part of the Federal NPL site. Flammable liquid waste was burned in several pits in the lagoon area until 1965, when the Connecticut Department of Health ordered a halt to on-site burning of waste. The site was the subject of several federal and state enforcement actions and was added to the NPL in 1990. Chlorinated solvents from the lagoon flow under the Quinebaug River and have been detected in shallow groundwater on farmland across the river from the site. Contaminated groundwater from the site has not affected any drinking water wells. In 1988, EPA selected a capping remedy for the lagoon. The lagoon was covered with an impermeable cap in the summer of 1990, and a permanent vegetative cover was added in 1991. DEP is responsible for the operation and maintenance of the cap using state funds. EPA continues to conduct quarterly groundwater monitoring. EPA continues to negotiate with the owners of the site and three properties across the Quinebaug River to record Environmental Land Use Restrictions that would prevent the use of groundwater in the area affected by site contamination. DEP is working with EPA to ensure that these restrictions meet state requirements. EPA completed Five Year Reviews for the site in September 1998 and September 2003.