Agenda - Environmental Policy Board - 01/05/2015

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SITE LOCATION AND DE9CR FnON The Anoka - Ramsey Landfill (Landfill) is located in the city limitsof Ramsey (City), Anoka County, Minnesota (Appendix B). A landfill's Land Management Area (LMA) indudesthe property described in the Landfill Cleanup Agreement between the M PCAand 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 LMAwill be comprised of the property in the Landfill Cleanup Agreement. In addition, the LMAisthe property that is subject to Minnesota Elatutes 115B.412, SUbd. 9 of the LCAthat requiresthe M PGAto develop a Land Use Ran for the landfill and with which the LGU's land use plan must be consistent. The LMAfor the Landfill consistsof 267 acres described in the Landfill Cleanup Agreement, additional parcelsof land purchased by the M PCAand lands sold through friendly condemnations are shown in Appendix G The Landfill was operated as a dump from 1967 until it was permitted in 1972 and dosed in 1993. The waste footprint is about 65 acres. The M PCAtook over responsibility for the Landfill in 1997 when the M PCAand Waste Management signed the Landfill Cleanup Agreement and the M PCP, issued the Notice of Compliance. The LMA is currently owned by the M PCA. GROUN DWATER AND M ETHANE GAS AREAS OF CONCERN Groundwater Area of Concern The Groundwater Area of Concern (GWAOQ is defined as t he area of land surrounding a landfill where the presence of activities that require the use of groundwater maybe 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 GWAOCis used to inform the public about the current and potential risks to users of groundwater contaminated by the landfill. Inmost circumstances this area is not equidistant around the site. The GWAOCisshown 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 aglacial 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 parcelsthat are not on city water because there may be shallow ground water flow towards S%nfish 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 isto the southeast. Private wellsto the east and southeast are protected by the Anoka M unicipal R-,gional Landfill groundwater extraction system and by the geology of the bedrock aquifer. In addition, flow in the bedrock aquifer isto the south and southwest from the waste footprint. These 2