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Record of Decision System (RODS)



Address:  65 SHUN PIKE 
City & State:  JOHNSTON  RI  029194512
EPA ID:  RID980520183
EPA Region:  01
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R01-94/088
ROD Date:  06/17/1994
Operable Unit(s):  01
Media:  groundwater, solid waste
Contaminant:  Latex wastes, acid wastes, corrosive wastes, water soluble oils, waste solvents
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

The 154-acre Central Landfill is located in Johnston, Rhode Island. The site is comprised of two areas: a 121-acre area Phase I area and a 33-acre Phase II and III area. The Phase I area is the area of the site where disposal of hazardous and nonhazardous wastes historically took place. Twelve areas of the 33 acres of the Phase II and III area are currently being used for the disposal of nonhazardous municipal solid waste. Land use in the area is predominantly composed of undeveloped property, residential development, and small businesses.

From 1980 to the present, the Central Landfill has been owned and operated by the RI Solid Waste Management Corporation (RISWMC) and receives approximately 85% of the city of Johnston's municipal solid waste. From 1952 to 1955 a portion of the site was used as a sand and gravel/quarry stone operation. From 1955 to 1962, the site was operated as a refuse burning dump. The site has been used as a solid waste disposal area since 1962. An approximate 0.5 acre portion of the Phase I area, where large volumes of liquid industrial waste were accepted for disposal in the mid to late 1970's in trenches is considered a hot spot. Wastes disposed of at the site include aqueous solutions of latex waste, acid waste, corrosive waste, water soluble oils and waste solvents. From 1979 to 1981, 5-10 acres in the vicinity of the hot spot received large volumes of untreated liquid sewage sludge.

In 1984, the Central Landfill Site was proposed for inclusion on EPA's National Priorities List (NPL). It was included on the NPL in June 1996. An RI commenced in 1987, after RISWMC signed an agreement with the EPA to identify the contamination at the site. In 1987, the Rhode Island Department of Environmental Management (RIDEM) ordered RISWMC to close the hazardous waste disposal area. Subsequent site work indicated that the closure did not cover the actual hazardous waste disposal area. This area is the hot spot addressed in the ROD. RIDEM/Wetlands Division issued Notice of Violation to RISWMC in 1983 for violations of the Fresh Water Wetlands Act. The EPA and RISWMC entered into a Consent Order to perform a RI/FS in April 1987. The RI was completed in March 1993 and the FS was completed in December 1993.

This ROD addresses OU1 which discusses source control at the site. Treating groundwater from the hot spot area and capping the landfill constitute the primary remedy at this site for the principal threats in the groundwater. The remedy status for the media addressed in this ROD are as follows: Groundwater 1 is Final Action. The media volume associated with this site is not documented. Solid Waste 1 is Final Action. The media associated with this site has a volume of 121 Square Kilometers. The state concurs with the selected remedy.
Remedy:  The selected remedial action includes minimizing infiltration of precipitation and leachate; constructing a multi-layer RCRA C cap over the existing 121 acre Phase I area and incorporating the existing 32 acres of RIDEM approved cap on the side slopes; hydraulically containing and treating groundwater in the hot spot area of the landfill and discharging the treated groundwater to either on-site surface water or the Cranston Waste Water Treatment Plant; implementing deed restrictions on groundwater use and land development within property owned by the RISWMAC; initiating a long-term program of sampling and analysis of groundwater, surface water and air; conducting a detailed evaluation of the existing landfill gas collection and combustion system; and installing a chain link fence to prevent access.
Text:  View full-text ROD [ 208K ]
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