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. Additional environmental investigation should be considered at the properties where the trichloroethylene (TCE) concentrations exceed the Health Risk Limit (HRL). If a source is found on one or more of these properties, additional subsurface investigation is recommended to de�ine the lateral extent of the TCE contamination. . Future redevelopment should consider the presence of TCE in the glacial aquifer. Site speci�ic investigations should be conducted in a way that wi11 identify potential souree(s), magnitude, and extent to TCE in the AUAR area . Based on the presence of diesel range organics (DRE}} in the glacial aquifer and throughout the AUAR area, environmental investigation with regard to petroleum contamination should be preformed throughout the AUAR area. . Prior to undertaking environmental assessments and investigations on individual parcels within the AUAR area, the �indings and conclusions of the Supplemental Groundwater Evaluation Report (August 2004) should be considered. By doing so, future investigations can be streamlined to facilitate and expedite redevelopment. 14) The City will require that proj ect proposers submit photographs and note the construction dates for any buildings over 50 years o1d, and submit them to the State Historic Preservation Office for an initial assessment. 15) The City wi11 require a traffic impact analysis for a11 developmentprojects within the AUAR area. The traffic impact analysis wi11 assist the City and other road authorizes in determining the appropriate mitigation measures that are required to reasonably mitigate impacts of a speci�ic development proposal. If the City determines that a speci�ic proposed project causes impacts that exceed the thresholds that the mitigation strategies where meant to address (see Mitigation Strategy 16), then the development intr;nsit�/density of such a project may need to be reduced. The City, in cooperation with Ramsey County and the Minnesota Department of Transportation, wi11 monitor traffic volumes and movements in the Twin Lakes area in order to reevaluate impacts of development. Speciiic recommended improvements to the transportation system include the following (P1ease note that the recommended improvements listed below, unless noted speci�ically for Scenario A, should he applied a11 scenarios at fu11 development): 16.A. Countv Road C at C1eveland Avenue - Construct a dedicated westbound right-turn lane (with tuz-t� lane storage) - Construct an additional southbound 1efl-turn lane (dualleft-turn lanes) (Scenario A only) - Construct a southbound right-turn lane (with t�.rrn lane storage) (Scenario A only} - Construct a northbound right-tum lane (Scenario A only) � Extend the existing eastbound 1eft-turn lane (Scenario A only) 16.B Countv Road C at Fairview Avenue - Construct right-tum lanes for the eastbound, westbound and southbound approaches (Scenario A only) 16.0 Countv Road C at Snelli�� Avenue Twin Lakes Business Park Final AUAR Update City of Roseville - October 3, 2007 =�