Congressional District # 05
OMEGA HILLS NORTH LANDFILLEPA ID# WID000808568
Last Updated: December, 2009
The Omega Hills North Landfill site covers 83 acres in the southeastern part of Wisconsin near metropolitan Milwaukee. The State of Wisconsin licensed this landfill to accept hazardous wastes from 1977 until 1982. It is estimated that the facility had accepted about 5,000 tons of hazardous waste each year. The state estimates there are now more than 150,000 cubic yards of waste on the site. This total includes 3,300 cubic yards of heavy metals and 350 cubic yards of solvents. About 250 Wisconsin industries have used the site for hazardous waste disposal. Large amounts of asbestos have been disposed of at the site. More than 15 million gallons of liquid waste were disposed of at this site each year until it stopped accepting such wastes; this includes an estimated six million gallons of hazardous liquid waste. The site stopped accepting hazardous wastes in 1982 and liquid wastes in 1983. In 1989, the site stopped accepting all wastes, and a soil cover was installed in accordance with the Wisconsin Department of Natural Resources (WDNR) Solid Waste requirements.
The facility was originally built with a leachate collection system, an extensive network that collects the waste material before it reaches the groundwater. However, the system for collecting leachate has not operated as it was designed, which has resulted in the accumulation of approximately 200 million gallons of liquid waste under the site. Approximately 42,000 people live within a three-mile radius of the site. There are 874 private wells, located within three miles of the landfill. Most residents are currently connected to the municipal water. The nearest municipal well is located 1.5 miles away, and the nearest residences are 150 yards from the site. Several office buildings are located within 100 yards of the property.
Site ResponsibilityThis site is being addressed through a combination of federal, state, and potentially responsible parties' actions.
Threats and ContaminantsLeachate has been migrating from the site and has contaminated the shallow groundwater under several private wells in the area with volatile organic compounds (VOCs) that include benzene, toluene, and vinyl chloride and heavy metals such as zinc, nickel, arsenic, and cadmium as well as phthalates, a byproduct of plastic production.
Currently, a number of low fences surround the site, and signs have been posted, warning people not to trespass on the landfill property. The site is closed and covered with four feet of compacted clay. Under state monitoring, the owner of the site installed additional perimeter slurry or compacted clay cutoff walls and systems to collect leachate, preventing it from entering the groundwater under the site. The owner also installed a pretreatment plant for the leachate and devices to intercept and collect gases that escape from the landfill. Residents in the area now use municipal water.
This site has been deleted from the National Priorities List, because it is being addressed under authorities other than Superfund.
The facility is currently being monitored by the Wisconsin Department of Natural Resources using Resource Conservation and Recovery Act (RCRA) authority and annual reviews of site operations are being conducted.
Property ReuseThe site is a closed landfill, which is currently capped and fenced.
ContactsRemedial Project Manager, U.S. EPA
gladys beard (email@example.com)
AliasesGERMANTOWN LDFL 1
LAUER LDFL II
OMEGA HILLS NORTH LDFL
WASTE MGMT OF WISCONSIN INC OMEGA HILL
CHEMICAL WASTE MGMT OF WISCONSIN
GERMANTOWN LDFL WASTE MGMT OF WISCONSIN