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5, De:tm.is Welsch Community of Roseville 2660 Civic Center Roseville, 113-1899 RE: Twin Lakes Parkway Corridor Site MPCA Project Number VP13320 Dear Mr. Welsch: The Minnesota Pollution Control Agency (rvIPCA) stafiin the Voluntary Investigation and Cleanup (VIC) Unit are working cooperatively with the City ofRo'seville (the City) to investigate area-wide ground water conditions at the proposed Twin Lakes Redevelopment area. This letter provides review comments on the "Supplemental Groundwater Evaluation Report:' (the Supplemental Report) prepared by DPRA Incorporated, dated August 200.4. The area of investigation for the purposes of the area-wide ground water investigation consists of 170 acres approximately bounded to the west by Cleveland Avenue; on the north by County Road C-2; on the east by Fairview Avenue; and on the south by County Road C (the Site). This work is being conducted by the City as part ofthe Twin Lakes Parkway Corridor VIC Site, which originally focused On environmental investigation along County Road C proposed to be redeveloped as a parkway. On August 6, 2003, the City and theMPCA entered into an agreement (Agreement) to establish a framework to facilitate an area--wide ground water investigation across the entire Twin Lakes Redevelopment Area. The purpose of the area-wide investigation, as described in the Agreement is to characterize the hydrogeologic conditions across the extent magnitude of ground water contaminant releases originating within the Site, to identify additional environmental investigation that needs to be performed and to identify properties that are considered appropriately characterized in order to satisfy requirements for issuance of :Land Recycling Act assurances. The goal ofthe area-wide investigation is to evaluate ground water quality conditions .on a larger scale in order to minimize the amount of future additional ground water investigation needed for the issuance of Assurances for individual properties within the redevelopment area. The MPCA VIC Program oversight, and the Agreement, however pertains only to the nonpetroleum releases at the Site. Regulatory oversight for the petroleum releases at the Site will be provided by the :tvIPCA Voluntary Petroleum Investigation and Cleanup Program staff. Previous investigations related to the area--wide investigation have included the "Limited Environmental Site Assessment" and the "Groundwater Evaluation Report" (GE Report). The GE Report identified three ground water units at the Site - two discontinuous perched water 520 Lafayette Rd. N.; Saint Paul, MN 551SEi-4194; (651) 296-6300 (Voice); (651) 282-5332 (TTY); www.pca.state.mn.us St. Paul- Brainerd - Detroit Lakes · Duluth · Mankato - Marshall - Rochester - WilImar . Equal Opportunity Ernployer. Printed on rec:ycled paper containing at least 20 percent fibers from paper recycled by consumers.