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years. Given the low permeability soils present at the site, it could easily take longer than three <br />years, and there is a good likelihood that all soil impacts could not be practically removed using <br />this technology. <br />If the site is not remediated to ASTM standards, additional costs will be incurred for site <br />redevelopment. The property value should be reduced by an amount equal to the cost of site <br />cleanup. Additional redevelopment costs could potentially be required for: <br />1. installation of a vapor barrier beneath any proposed building foundations, <br />2. preparation of a soil management plan for addressing impacted soil encountered during <br />construction activities, <br />3. excavation, trucking, disposal, and replacement of impacted soil, and <br />4. obtaining letters that limit liability for the release from the MPCA. <br />There is also a potential concern with the former site water well. It is within the area of impacted <br />soil. If the well was improperly constricted or sealed, it could provide a conduit for the <br />enhanced migration of petroleum hydrocarbons to the water table. It does not appear that the <br />groundwater at the site has been assessed. At least one soil boring should be advanced, at a <br />location near the former water well, down to the water table to assess if the groundwater has been <br />impacted. <br />If you have any questions I may be contacted at 649 -0400. <br />Sincerely, <br />RESPEC Inc. <br />A%,tct.I, <br />Kevin Pierson, CHMM <br />Senior Project Manager <br />KBP <br />2 <br />Page 119 <br />