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Waste Site Cleanup & Reuse in New England
  Serving Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont & 9 Tribal Nations
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Map this site in Cleanups in My Community
 South Kingstown,  Rhode Island
 Washington County
 Street Address: PLAINS ROAD
 Zip Code: 02881

 EPA ID #: RID981063993
 Site ID #: 0101322
 Site Aliases: South Kingstown Landfill No. 2, URI Gravel Bank, Sherman Farm

 Site Responsibility: Federal, State, Potentially Responsible Parties

 Proposed Date 07/29/1991
 Final Date 10/14/1992

Site Description
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This site consists of two adjacent properties, the West Kingston Town Dump and the University of Rhode Island (URI) Disposal Area. Known in the past as "South Kingstown Landfill #2," the 6 acre West Kingston Town Dump received solid waste from the Town of South Kingstown beginning in the 1930s. In the early 1950s, the Town of Narragansett and URI also began disposing of their solid waste in the landfill. This disposal of solid waste went unregulated until 1967, when the Rhode Island Department of Health (RI DOH) noted, during a site inspection, that wastes disposed of at the site were from industrial, residential, commercial, and institutional sources. Numerous operational violations were subsequently cited by the RI DOH. A 1975 study conducted by the URI Department of Civil Engineering and the Rhode Island Water Resources Board resulted in the discovery of a leachate plume beneath the landfill which was contaminating groundwater as far as 1,200 feet west of the dump. From 1945 to 1987, solid waste was also accepted at the 12-acre URI Disposal Area, referred to in the past as the "URI Gravel Bank" or the "Sherman Farm." After closure of the town dump in 1978, the URI Disposal Area began accepting most of URI's waste, including small quantities of empty paint cans, oil containers, and pesticide containers. Lab equipment, machinery, closed drums, and old tanks buried on site were discovered by the Rhode Island Department of Environmental Management (RIDEM) during a 1987 inspection. The RIDEM instructed URI to remove contaminated debris from the site, an action which was completed by URI in 1987. Vehicle access to the site is restricted by a locked chain-link gate across the gravel access road at its intersection with Plains Road. An estimated 15,800 people obtain their drinking water supply from three major public wells located within 4 miles of the site. An additional 12,000 persons are supplied by private wells, the nearest being approximately 1,000 feet northwest of the site. The site is located within the Chipuxet River valley basin. Hundred Acre Pond, part of the river, is approximately 1,500 feet from the site. The river basin is a major groundwater resource.

Threats and Contaminants
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Several volatile organic compounds (VOCs) were detected in private wells near the site in the late 1980s; these three residences has since been connected to the URI water supply. VOCs have also been detected in the on-site pond. EPA completed the Human Health and Ecological Risk Assessments as part of the Remedial Investigation in 2006 and found elevated potential risks from tetrachloroethene (PCE) and trichloroethene (TCE) in groundwater should it be used as drinking water source in the future.

Cleanup Approach
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The site is being addressed in two stages: immediate actions and a long-term remedial phase focusing on cleanup of the entire site.

Response Action Status
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Immediate Actions In 1987, URI removed 159 tons of materials and transported them to federally-approved waste disposal facilities. Additional removal investigations of the site were performed in mid-1992 and the fall of 1993. These investigations indicated that the site did not pose an immediate threat to human health or the environment. Three private wells, located approximately 875 feet west of the site, were closed in 1988 due to contamination and were connected to the URI water supply.

Entire Site An Remedial Investigation to determine the nature and extent of contamination at the entire site began in 2002. The first phases of soil, groundwater and surface water testing and preliminary design for the closure of the landfill was done in the Spring and Summer of 2003. Additional groundwater testing was done in 2004 and 2005. The landfill closure design was completed in 2005. Construction of the landfill caps commenced in the Fall of 2005 and was completed in the Spring of 2006. In September of 2006, EPA issued a Record of Decision (ROD) for the comprehensive final cleanup of the remaining contamination at the Site. The remedy includes in-situ oxidation of soil and groundwater followed by monitored natural attenuation of the groundwater; institutional controls in the form of deed restrictions; and long-term environmental monitoring. The in-situ oxidation of groundwater will be achieved by injecting an oxidant solution into the subsurface area until about 90% of the VOC mass in the source area groundwater is eliminated.

Enforcement HighlightsIn August 2001, EPA and the Rhode Island Department of Environmental Management (RIDEM) entered into an enforcement agreement as a mechanism to implement a potentially responsible party (PRP)-lead clean up of the site. In October, 2001, the State issued a Letter of Responsibility with a Scope of Work to four potentially responsible parties to conduct an RI/FS and implement measures to close the landfill. In June, 2007, EPA commenced Special Notice negotiations with the PRPs to implement the remedy documented in the September 2006 Record of Decision (ROD). These negotiations were successfully concluded in the summer of 2008.

Environmental Progress
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The 1987 removal and disposal of materials from the site reduced the immediate health hazards. Three residents, where VOCs were found in residential wells, were connected to the URI public water supply in 1988. Remedial Investigations and landfill cap construction were completed at the Site in 2006. The final remedy for the site was selected by EPA in September 2006 and addresses the remaining soil and groundwater contamination at the site.

Current Site Status
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A State-lead Remedial Investigation was initiated at the site in the fall of 2002. Additional groundwater testing was done in the Fall of 2004 and 2005. The landfill closure design was completed in 2005. Construction of the landfill caps commenced in the Fall 2005 and was completed in the Spring 2006. EPA selected the final remedy for the site in September of 2006 and negotiated its implementation with the PRPs under a Consent Decree in 2008. The PRPs completed field pilot tests and source area soils treatment design work in the summer of 2008. The soils treatment remedial action was completed in June of 2009. A groundwater remedial design was completed in winter of 2009 and the groundwater remedy construction, including the first round of oxidant injection, was completed in the fall of 2009. Additional groundwater oxidant injections were done in the spring of 2010. Semi-annual remedy performance and long-term groundwater monitoring, together with landfill closure monitoring, are on-going. EPA completed the first five-year review of the site in 2010 and found the remedy functioning as designed. EPA, the State and the PRPs are also in the process of establishing land and groundwater use restrictions at the Site to ensure long-term protectiveness. The second five-year review for the site is expected to be completed in the summer/fall of 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 Only, Record of Decision (ROD), October 2006 (1.51 MB)  

Reports and Studies:
Proposed Plan, June 01, 2006 (4.38 MB)  
First Five Year Review Report, August 18, 2010 ( 3.22 MB)  

Decision Documents:
View Records of Decision (RODS) on-line (EPA HQ)  
Record of Decision (ROD), September 28, 2006 (9.96 MB)  

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

Site Repositories
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South Kingstown Public Library, 1057 Kingstown Road, Peace Dale, RI 02879 ph. 401-783-4085, 401-789-1555

OSRR Records and Information Center, 1st Floor, 5 Post Office Square, Suite 100 (HSC), Boston, MA 02109-3912 (617) 918-1440

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EPA Remedial Project Manager: Anna Krasko
Site Responsibilities: Remedial Project Manager
Address: US Environmental Protection Agency
5 Post Office Square, Suite 100
Mail Code OSRR07-1
Boston, MA 02109-3912
Phone #: 617-918-1232
E-Mail Address: krasko.anna@epa.gov

EPA Community Involvement Coordinator: Sarah White
Address: US Environmental Protection Agency
5 Post Office Square, Suite 100
Mail Code ORA20-1
Boston, MA 02109-3912
Phone #: 617-918-1026
E-Mail Address: white.sarah@epa.gov

State Agency Contact: Gary Jablonski
Address: RIDEM
Office of Waste Management
235 Promenade Street
Providence, RI 02908-5767
Phone #: 401-222-2797
E-Mail Address: gary.jablonski@dem.ri.gov


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Last updated on Wednesday, November 4th, 2015
URL: http://www.epa.gov/region1/superfund/sites/wkingston