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City • Roseville Project 3 L-07-05948A April 7, 2008 Page 2 I Based on the results of previous environmental investigations completed at the Site, petroleum -related contaminated siolil will likely be encountered during the earthwork activities for building footings and underground utility installations in the area of the former tank basins and product lines/dispensers, located on the western portion of the Site. In adon, p etroleum-related contaminated soil from historic land4reatment activities may be encountered on the eastern portion of the Site. Vapor, mitigation measures will be taken to address potential soil vapor impacts from petroleum and poltential noin-petr,ol eu�m -related contamination, as identified in limited concentrations in deep groundwater samples collected at the Site. Specifically, a IFpassive it soil vapor extraction (SVE) system for potential contam�nant vapors, (including piping and a vapor retarder) wiill be engineered and installed in the subgrade beneath each of the proposed buildings,, with the exception of the proposed parking ramp. Following completion of the buildings, soil gas from the soil vapor mitigation: system piping wil'f be monitored for the presence of organic vapors with a photoionization detector and for explosive conditions with an ex,plosimeter. One pre-occupancy and, four quarterly post-occupancy monitoring events will be cojiducted. In addition to the impacted soil and groundwater at the Site, asbestos-containing vermiculite insulation was identified within the block walls of the existing two-story office and warehouse building. Because thei asbestlos�containlng insulation cannot be removed cost effectively prior to demolition, all of the block walls and associated building materials that are impacted by the asbestos-containing insulation will be considered asbestos waste and handled/disposed off-site as such. Environmental Costs The following. is a surnmary of the approximate environmental costs and the proposed grant eligibl environmental costs that will be incurred during redevelopment. i Phase I Environmental Site Assessment $ 2,900 Development Response Action Plan $ 2,000 MPCA Fees Total Pre-Development Cost 6,400 Environmental Consulting $ 80,000 Analytical Testing of Soil $ 35,000 MPCA Fees $ 20X0 Installation of Vapor Barrier and Vent System (65,1000 sf @ $2/sf) $130,000 Asbestos, Abatement $115,000 Soil Management and Disposal (I 0,1 00 tons @ $2 /ton) $253FOOO Total Development Related Cost $633,000 Totall Cost $6.399300