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closest to the proposed bridges on Curry Street and Maria Street.Ms. Giffin noted that staff has received a return call from one of these two residents stating that both he and his neighbor spoke about the proposed soundwall and that it was acceptable to them. She further noted that the proposed wall would be one foot higher than the existing wall and that the repaving and the new soundwall would reduce traffic noise levels near Staples Ranch to 60dB. She added that ACSPA has agreed to install the new soundwall and to contribute $500,000 to the repaving of Stoneridge Drive between Kamp Drive and Trevor Parkway. Ms. Giffin stated that it is important to note that even with this mitigation measure, there will still be a significant unavoidable noise impact since noise levels will increase by more than 4dB near Stoneridge Drive. With respect to the GHG emissions, Ms. Giffin stated that even with the inclusion of Best Management Practices (BMPs) such as greenbuilding, bicycle parking, bicycle and pedestrian connections and bus stops, the GHG emission thresholds for this project will also still be exceeded, and, hence, GHG emissions are likewise a significant unavoidable impact. Ms. Giffin indicated that the project staff is recommending is a Four-Lane Concurrent Extension Alternative with a phasing modification, called the Preferred Project in the staff report and related CEQA documents. She explained that under this alternative, Stoneridge Drive would be extended to El Charro Road, and the Stoneridge Drive bridges would be constructed to accommodate two lanes of travel in each direction, with both bridges being initially striped such that there would only be one lane of travel in each direction, with an expectation that in the future, the City Council would approve re-striping the bridges to accommodate two lanes of traffic in each direction. She added that because eventually there will be two lanes of traffic in each direction, the mitigation measures for the Preferred Project would be the same as for the Four-Lane Concurrent Extension Alternative without the phasing modification. Ms. Giffin stated that as drafted, the Preferred Project provides flexibility and allows the City Council to gauge changing traffic conditions, the efforts of the City’s regional partners to support funding, and construction timing of regional improvements. She added that it also allows the City Council to make a determination to re-stripe the Stoneridge Drive bridges to two lanes in each direction even if the regional improvements have not been completed, thereby vesting the City Council with the freedom to exercise its discretion on how best to manage Pleasanton’s roadways. She noted, however, that peak traffic volumes by the proposed bridges will be less when the bridges are initially striped for one lane in each direction. Ms. Giffin stated that under the Preferred Project, seven intersections in Pleasanton are impacted but are proposed to be mitigated to a less-than-significant level: Hopyard Road at Owens Drive, Hopyard Road at Stoneridge Drive, Santa Rita Road at Stoneridge Drive, Santa Rita Road at Valley Avenue, Santa Rita Road at I-580EB PLANNING COMMISSION MINUTES, May 26, 2010 Page 6 of 27