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, Minnesota Pollution -Control Agency Landfill Cleanup Program system. ,(Homes in the area are January1993, a small on -site would possibly be discontinued, i connected to a municipal water shed exploded. In the fall of If ground water quality does note supply:) 1993, Washington County improve, alternative forms of installed an interim gas- treatment would be evaluated. Site Description and extraction system on the western The design, installation and History edge of the landfill to control monitoring of the Washington.. The WashingtonCounty Landfill landfill as from moving off the 8 g County Landfill cover system operated as an MPCA permitted site. gas extraction system and sanitary landfill from May 1969 What are the MPCA's plans - ground water pump out system until May 19,75. The publicly- for the Washington County would be funded by the owned landfill accepted mixed- LandfillT Minnesota Landfill Cleanup municipal solid waste and Program. industrial waste. The goals of the MPCA's plan are 1111981, the MPCA and to install a new cover system and Whatls the Landfill 1 Washington County began active gas -extraction system and Cleanup Program? testing ground water near the to evaluate the current ground The Landfill Cleanup Program landfill site for contaminants. water treatment system. Was established by the VOCs were detected in ground The existing two -foot cover Minnesota Legislature in 1994 to water beneath the site and in the system does not meet current provide the state with the private wells of two homes near final.Cover requirements. Under resources to investigate and the site. In 1983, the Minnesota the plan, the MPCA would install conduct corrective actions at Department of Heath (N4DH) a cover system consisting of a dosed landfills that are issued drinking water advisories geosynthetic membrane covered Superfund sites or would likely to those homes and supplied by a sand -drainage layer and two become so in the future. More , bottled water to,the residents. feet of cover soil: A better cover than 1.00 dosed landfills qualify . Homes in the area are now would'improve runoff control at for the program. connected to a municipal water the Washington County Landfill The MPCA has developed supply. and reduce the productionof priority list for qualified 1111983, a ground water pump- leachate. landfills. Nine landfills are and -treat system was installed to The plan calls for installing an classified as high -priority sites capture and treat contaminated active gas -extraction system in needing immediate action in ground water at the site. Treated the waste. Active gas -extraction order to protect public health or ground water is currently tested wells would be installed and the the environment. These. by Washington County for current barrier gas -extraction landfills will be worked on this contaminants and then sprayed system would be turned off. The year. onto landfill property to be new system would keep landfill The Washington County reabsorbed into the ground:, gas from moving off the site and Landfill is a high -priority site Additional water is tested reduce the explosion risk to because of the continued risk periodically and pumped into the nearby buildings. from ground water Tri-Lake Watershed Outlet through a ditch located west of The MPCA would evaluate the contaminationand the potential the site. impact of the cover and gas- , for landfill gas to migrate off the extraction system on the ground site. An investigation by MPCA staff in August 1992 determined that water quality. If ground water quality improves, the ground When Will construction be landfill. gas standards were being water pump -and -treat system Completed? exceeded on the western The MPCA expects to begin. perimeter of the landfill. hi installation of the final cover March 1995 Page two