06 16 20 PWA_02_02 Exh2 - IS-MND

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L w FAIRVIEw BRIDGE REPLACEMENT AND STREET IMPROVEMENTS INITIAL STUDY/MITIGATED NEGATIVE DECLARATION `J' (9TH STREET TO 16TH STREET) PROJECT MAY 2020 SANTA ANAL CALIFORNIA from 17th Street to 16th Street would continue to result in unsatisfactory LOS F conditions. However, this segment is outside the Project limits. As described earlier, the City's General Plan Circulation Element identifies Fairview Street as a 6-lane Major Arterial Highway, including the segment between 17th Street and 16th Street. Implementation of additional lanes within this roadway segment, consistent with the General Plan, would eliminate the roadway deficiency. As discussed above, as part of its annual CIP, the City conducts ongoing monitoring and collects citywide traffic data for all arterials and intersections within the City. As part of this ongoing monitoring, the City determines needed improvements and prioritizes projects for funding to address identified congestion and/or safety concerns. The segment of Fairview Street between 17th Street and 16th Street is already identified as roadway link of concern. The proposed improvement of Fairview Street from four through lanes to six through lanes could result in a significant impact at the intersection of Fairview Street and Civic Center Drive in the 2040 Plus Project a.m. peak -hour conditions. In order to mitigate the potentially impacted a.m. peak -hour condition, the intersection would need to be restriped to allow additional movements —specifically, restriping the westbound shared left -through lane to allow right turns as well (a shared left -through -right -turn lane). The allowance of westbound right turns from the westbound shared left -through turn lane is anticipated to improve the 2040 Plus Project condition a.m. peak -hour intersection v/c ratio from a deficient 0.908 (LOS E) to an acceptable 0.842 (LOS D). The 2040 Plus Project condition p.m. peak -hour intersection v/c ratio is anticipated to improve from an acceptable 0.876 (LOS D) to an acceptable 0.810 (LOS D). As this impact and deficiency are not anticipated to occur until the 2040 Plus Project condition, it is recommended that this improvement not be implemented until deemed necessary. This should be done through intersection operations monitoring (particularly of the westbound right -turn movement) by City staff. The requirement to monitor this intersection and to implement the intersection modification when warranted is included in Mitigation Measure TR-2. Unsignalized Queuing Analysis. To determine the necessary turn pocket lengths at the intersections of Fairview Street/16th Street and Fairview Street/9th Street that would be affected by the proposed Project, LSA conducted an HCM-based queuing analysis for the 2040 Plus Project traffic condition. Table 3.17.G shows the results of this queuing analysis. Table 3.17.G: 2040 Plus Project Fairview Street Turn Pocket Queuing Intersection Movement Existing Pocket Length (ft) 95th percentile queue (ft)1 AM Peak Hour PM Peak Hour Fairview Street/16th Street Northbound Left 50 <25 <25 Fairview Street/9th Street Northbound Left 55 33 38 Southbound Left 95 48 <25 Queue length is based on a design vehicle length of 25 ft. Queue lengths of less than one vehicle are noted as "<25" to signify that a minimum of one vehicle length of queueing storage should be provided. ft = foot/feet 3-100 R:\WKE1702\ISMND\Final ISMND\Fairview Street Bridge Final ISMND.docx (05/26/20)