Congressional District # 01
HUNTS DISPOSAL LANDFILLEPA ID# WID980511919
Last Updated: September, 2011
The Hunt's Disposal Landfill, located in southeastern Wisconsin, consists of 35 acres. The site was originally an abandoned sand and gravel pit. Site operations began as an open dump in 1959 and continued until 1974 when the State of Wisconsin denied the license renewal application to operate as a landfill. The landfill reportedly accepted a variety of municipal and chemical wastes during this period. Approximately 40 homes are located within a one-half mile radius of the landfill. A rural community of approximately 150 homes is located west of the site. The community uses local groundwater as a drinking water source. Based on the sampling of the residential wells in the surrounding area, the local water supply is not impacted by the landfill.
The U.S. Environmental Protection Agency (EPA) proposed the site for the National Priorities List (NPL) in June 1986 and finalized the site on the NPL in July 1987.
This site is being addressed through federal, state, and potentially responsible parties' actions.
Threats and Contaminants
Contaminants of concern include organic compounds such as vinyl chloride, benzene, trichloroethene, xylene, polychlorinated biphenyls (PCBs), and various metals such as arsenic, chromium, and barium. The total waste volume at the site was estimated to be approximately 168,000 cubic yards. Contaminated areas and media identified at the site were groundwater, soil, sediment in a nearby river, and exposed landfill wastes. These have been addressed as part of the site cleanup, described below in "Cleanup Progress."
EPA issued a Record of Decision (ROD) for the site on September 29, 1990. EPA and the Potentially Responsible Parties (PRPs) entered into a Consent Decree (CD) on April 21, 1992. Under the terms of the CD, the PRPs agreed to conduct all Remedial Design/Remedial Action (RD/RA) activities for the site. Construction of the selected remedy was initiated in mid-1995 and was completed in October 1996. The remedy included the following: 1) perimeter fencing; 2) a multilayer landfill cap; 3) installation of an underground slurry wall around the landfill; 4) installation of a groundwater pump and treat system; 5) installation of groundwater monitoring wells; and 6) installation of a landfill gas management system. A final site inspection was conducted by EPA and the Wisconsin Department of Natural Resources (WDNR) on March 11, 1997. The inspection concluded that all construction activities required under the approved Remedial Design were completed. EPA signed the Preliminary Close-Out Report (PCOR) for the site on May 7, 1997, and approved the RA Completion Report on October 8, 1997. The project is currently in the operation and maintenance (O&M) phase.
EPA completed the First Five-Year Review for the site in September 2001 and found that all expsoure pathways that could result in unacceptable risks were being controlled through the implemented remedy. The Second Five-Year Review, completed in September 2006, found that the remedy continued to be protective of human health and the environment. Since hazardous contaminants remain on the site, continued O&M is required. Consistent with the Second Five-Year Review, the PRPs submitted an Institutional Controls (IC) Study report to EPA for evaluation. EPA has reviewed the implemented ICs and have concluded that they are in place and effective.
EPA completed the Third Five-Year Review for the site on September 22, 2011. The assessment of the review found that the remedy is currently protective of human health and the environment. Based on the site inspection, monitoring data and communication with operation and maintenance personnel, no inappropriate land or groundwater use has been identified. Exposure pathways that could result in unacceptable risks are being controlled through the implemented remedial action, and land and groundwater use restrictions are in place and effective. Long-term protectiveness of the remedial action will be verified by continued monitoring of the landfill gas and groundwater conditions at the site, as well as continued compliance with use restrictions provided by the institutional controls.
EPA and WDNR are currently evaluating the results of a pilot test that was performed at the site to determine whether long-term changes to the remedy can be made at the site. The pilot test was conducted by the PRPs to evaluate whether or not groundwater conditions exist at the site that would support long-term shutdown of the groundwater extraction and treatment system. EPA anticipates that it will complete its evaluate of the pilot test by the end of October 2011.
An issue has been brought to EPA's attention that both WDNR and EPA are seeking to resolve. The issue concerns molybdenum contamination in private wells located northeast of the site. WDNR is conducting an investigation into the source of the molybdenum contamination in the area by sampling a number of potential source locations. The PRPs for the Hunts Disposal Landfill Site have agreed to perform sampling for molybdenum from the extraction wells and a number of monitoring wells at the site to supplement the WDNR investigation. Sampling is expected to be performed at the Hunts site in the autumn of 2011.
The site achieved the Site-Wide Ready for Anticipated Use (SWRAU) designation on September 23, 2009. This designation recognizes that all cleanup goals outlined in the Record of Decision have been achieved for site media that may affect current and reasonably anticipated future land uses, so that there are no unacceptable risks at the site. In addition, it is recognized that all ICs required to ensure long-term protectiveness for the site have been put in place.
ContactsRemedial Project Manager, U.S. EPA
linda kern (email@example.com)
Community Involvement Coordinator, U.S. EPA
CALEDONIA DUMP SITE