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Congressional District # 05


EPA ID# WID058735994
Last Updated: November, 2014

Site Description

From the mid-1950s to 1972, the 58-acre Boundary Road Landfill Superfund Site (also known as the Lauer I Sanitary Landfill), located in Menomonee Falls, Wisconsin, accepted a variety of municipal and industrial wastes. The owners closed and covered the site in 1973. It took several years for the owners to vegetate the cover and properly abandon the site. In 1973 and 1974, state inspectors identified holes in the berm around the site that allowed leachate from a collection pond to escape into a ditch that drains into the Menomonee River. In 1981, the owner installed an underground wall of clay materials between the landfill and the pond to stem the flow of leachate. Currently, Waste Management of Wisconsin (Waste Management) collects leachate accumulating behind the cut-off wall and sends it to a municipal wastewater treatment plant. Approximately 23,500 individuals reside within a three-mile radius of the site.

The U.S. Environmental Protection Agency (EPA) proposed the site for the National Priorities List (NPL) in September 1983 and finalized the site on the NPL in September 1984.

Site Responsibility

This site is being addressed through state enforcement of potentially responsible parties' actions. 

Threats and Contaminants

Soils and leachate are contaminated with benzene, cyanide, toluene, and zinc. Waste Management has redesigned and reconstructed the landfill cover to meet current landfill design requirements. The new cover controls rainwater infiltration, decreasing leachate production. The landfill is no longer used for recreational purposes, and leachate is contained within the site boundaries. 

Cleanup Progress

In August 1990, the State of Wisconsin and one potentially responsible party (PRP), Waste Management, signed an agreement. The agreement required Waste Management to take responsibility for investigating site contamination and for designing and constructing the state-selected cleanup action. 

Waste Management completed an investigation in 1993 under state enforcement and guidance to determine the nature and extent of contamination and to identify alternative cleanup methods. Based on the results of the investigation, the Wisconsin Department of Natural Resources (WDNR) selected a remedy in 1996 which included upgrading the existing landfill cap and leachate and gas collection systems. Waste Management completed the required construction work in October 1998, and is currently conducting scheduled monitoring: shallow downgradient monitoring wells, including those at the perimeter of the site, are monitored quarterly, deep downgradient monitoring wells at the perimeter of the site are monitored semi-annually, and downgradient private wells are monitored annually. 

WDNR and EPA completed the site's first five-year review on September 27, 2002, and the second five-year review on September 20, 2007. Both reviews found the remedy to be protective, but made recommendations with respect to the implementation of institutional controls at the site. In addition, both reviews recommended continued operation and maintenance of the site's remedy components, as well as the continued monitoring of leachate, landfill gas, and groundwater.

WDNR and EPA completed the third five-year review for the site on September 20, 2012. The five-year review found that the remedy is protective of human health and the environment in the short term. The remedy protects human health and the environment because the landfill cap adequately provides protection against direct contact with unacceptable levels of site contaminants. The groundwater flow regime is controlled and monitored to prevent further migration of groundwater contaminants from the site. Monitoring data indicate that the remedy is functioning as required to provide protection to and of the groundwater. Data indicate that there continue to be no ecological risks, and human health risks are addressed by the remedy. There are no known users of the contaminated groundwater underneath the site. Surface water is being protected through final cover maintenance and gradient control at the site, and routine monitoring is being conducted.

The next five-year review for the site will be completed in 2017.


Remedial Project Manager, U.S. EPA
linda kern (kern.linda@epa.gov)
(312) 886-7341

Community Involvement Coordinator, U.S. EPA
susan pastor
(312) 353-1325




Site Profile Information

This profile provides you with information on EPA's cleanup progress at this Superfund site.


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