2017-046 - Approving Addendum Nos. 1 and 2

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Santa Ana — Garden Grove Streetcar Project Traffic Study Addendum 2.2.3 Methodology and Significance Criteria The ICU method as described in Section 2.1.3 was used for the analysis of Santa Ana Boulevard/Ross Street. An impact would occur at this location if the closure of the westbound free right turn lane would result in the LOS to deteriorate from acceptable to unacceptable LOS. 2.3 Fairview Street Grade Crossing Analysis 2.3.1 Study Area Affected Intersections 1. Fairview Street/Civic Center Drive 2. Fairview Street/5th Street 2.3.2 Traffic Volumes and Geometric Configuration AM and PM peak hour intersection traffic volumes were based on the Year 2035 Streetcar Alternative 1 volume growth contained in the Traffic Impact Assessment. The Traffic Impact Assessment conducted in 2014 does not include the Fairview Street and 5th Street intersection as a study intersection. To provide consistency, existing 2016 counts were conducted for both study intersections on Wednesday February 17, 2016 during the AM and PM peak periods. Annual growth rates, obtained from intersection volumes for baseline and 2035 Streetcar Alternative 1 from the 2014 Traffic Impact Assessment, were applied to existing 2016 counts to represent future year 2035 traffic volumes. Baseline intersection configurations for Fairview Street and Civic Center Drive were based on the geometrics assumed as part of the 2035 Streetcar Alternative 1. Baseline intersection configurations for Fairview Street and 5th Street include: • Fairview Street Northbound and Southbound —1 left turn, 2 through, and 1 through right lane • 5th Street Eastbound and Westbound —1 left turn, 1 through, and 1 through right lane The Fairview Street grade crossing will not modify intersection configurations for both study intersections. 2.3.3 Methodology and Significance Criteria The analysis of the proposed grade crossing and the operation of the intersections of Fairview Street/Civic Center Drive and Fairview Street/5th Street with signal preemption was conducted using VISSIM, Synchro and the Highway Capacity Manual (HCM) methodology (based on delay) in addition to the city -approved ICU analysis methodology. The use of VISSIM as the modeling software provided the necessary detail to model streetcar operations, the grade crossing, and the adjacent signalized intersections. This analysis assessed the potential delay to be experienced at each location, with and without the Project. ® 5