Agenda - Parks and Recreation Commission - 04/09/2015

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SITE LOCATION AND DESCRIPTION The Anoka -Ramsey Landfill (Landfill) is located in the city limits of Ramsey (City), Anoka County, Minnesota (Appendix B). A landfill's Land Management Area (LMA) includes the property described in the Landfill Cleanup Agreement between the MPCA and the landfill owner/operator, and may include adjacent property that contains waste, adjacent buffer property (land acquired for the purpose of restricting use by the public due to landfill gas or groundwater concerns), and adjacent property where response action equipment is located. At a minimum, the LMA will be comprised of the property in the Landfill Cleanup Agreement. In addition, the LMA is the property that is subject to Minnesota Statutes 1156.412, Subd. 9 of the LCA that requires the MPCA to develop a Land Use Plan for the landfill and with which the LGU's land use plan must be consistent. The LMA for the Landfill consists of 267 acres described in the Landfill Cleanup Agreement, additional parcels of land purchased by the MPCA and lands sold through friendly condemnations are shown in Appendix C. The Landfill was operated as a dump from 1967 until it was permitted in 1972 and closed in 1993. The waste footprint is about 65 acres. The MPCA took over responsibility for the Landfill in 1997 when the MPCA and Waste Management signed the Landfill Cleanup Agreement and the MPCA issued the Notice of Compliance. The LMA is currently owned by the MPCA. GROUNDWATER AND METHANE GAS AREAS OF CONCERN Groundwater Area of Concern The Groundwater Area of Concern (GWAOC) is defined as the area of land surrounding a landfill where the presence of activities that require the use of groundwater may be impacted or precluded by contamination from the landfill, or may cause the groundwater flow direction to change thereby impacting the user or others nearby. The GWAOC is used to inform the public about the current and potential risks to users of groundwater contaminated by the landfill. In most circumstances this area is not equidistant around the site. The GWAOC is shown in Appendix D. The groundwater environmental monitoring system consists of approximately 104 wells. The groundwater contamination is in the Upper Sand that is part of the Anoka sand plain aquifer. There is also groundwater contamination in a glacial channel where the Grantsburg Till (that lies below the Upper Sand) is eroded and the Upper and Lower Sand are connected. Contaminants in groundwater that exceed drinking water standards include vinyl chloride, 1,2- dichloroethane and manganese. The groundwater plume is shown in two dimensions but extends to a depth of 100 feet below the ground surface. The area of concern extends east 1065 feet beyond the plume boundary to include parcels that are not on city water because there may be shallow ground water flow towards Sunfish Lake. The area of concern extends to the southeast 1,614 feet beyond the plume boundary because there are parcels in this direction that are not on municipal water and regional flow in the shallow groundwater is to the southeast. Private wells to the east and southeast are protected by the Anoka Municipal Regional Landfill groundwater extraction system and by the geology of the bedrock aquifer. In addition, flow in the bedrock aquifer is to the south and southwest from the waste footprint. These 2