2011-022 - Addendum to the FInal Environmental Impact Report No. 2004-02

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This chapter documents the methodologies and assumptions used to conduct the traffic study for the proposed project. This section contains the following background information: • Study timeframes • Project study area • Capacity analysis methodologies Study Time frames This traffic study presents an analysis of the critical intersection operating conditions during the AM and PM peak hours for the following anticipated timeframes: • Existing Year 2010 • Project Opening: Year 2013 • Long Range Buildout: Year 2035 The following scenarios have been analyzed: • Existing Conditions (2010) • Project Opening Conditions (2013) without Project • Project Opening Conditions (2013) with Project • Buildout (2035) Conditions without Project • Buildout (2035) Conditions with Project Project Study Area The study area was determined through analyzing the previous traffic study report and consulting with the City of Santa Ana staff. Figure I depicts the overall study area and identifies the intersections analyzed within the study area. A total of 8 intersections have been identified for analysis. While the majority of the intersections are within the jurisdiction of the City of Santa Ana, one intersection is shared with the City of Costa Mesa, another intersection is located within the City of Irvine, and two intersections are under Caltrans jurisdiction. As shown previously in Figure 1, the study area consists of the following intersections: • Main Street at Dyer Road • Main Street at MacArthur Boulevard • Main Street at Sandpointe Avenue • Main Street at Sunflower Avenue (City of Costa Mesa) • MacArthur Place at MacArthur Boulevard • SR -55 SB Ramps at MacArthur Boulevard (Caltrans) • SR -55 NB Ramps at MacArthur Boulevard (Caltrans) • Red Hill Avenue at MacArthur Boulevard (City of Irvine) KOA CORPORATION Updated Main and MacArthur Development Project PLANNING & ENGINEERING 4 Traffic Impact Study in City of Santa Ana