06 16 20 PWA_02_02 Exh2 - IS-MND

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INITIAL STUDY/MITIGATED NEGATIVE DECLARATION FAIRVIEw BRIDGE REPLACEMENT AND STREET IMPROVEMENTS L S A MAY 2020 (9TH STREET TO 16TH STREET) PROJECT SANTA ANA. CALIFORNIA Table 3.17.F: 2040 ADT Volumes and Roadway Segment LOS Roadway Segment I Arterial Type Capacity ADT LOS 2017 Existing Condition 17th Street to 16th Street 4 Lanes Divided 37,500 42,440 F Fairview 16th Street to 12th Street —Fairview Bridge 4 Lanes Undivided 25,000 41,890 F Street 12th Street to 9th Street 4 Lanes Divided 37,500 40,980 F 9th Street to Civic Center Drive 6 Lanes Divided 56,300 41,720 C 2040 No Project Condition 17th Street to 16th Street 4 Lanes Divided 37,500 45,130 F Fairview 16th Street to 12th Street —Fairview Bridge 4 Lanes Undivided 25,000 44,540 F Street 12th Street to 9th Street 4 Lanes Divided 37,500 43,580 F 9th Street to Civic Center Drive 6 Lanes Divided 56,300 44,360 C 2040 Plus Project Condition 17th Street to 16th Street 4 Lanes Divided 37,500 49,200 F Fairview 16th Street to 12th Street —Fairview Bridge 6 Lanes Divided 56,300 48,560 D Street 12th Street to 9th Street 6 Lanes Divided 56,300 47,510 D 9th Street to Civic Center Drive 6 Lanes Divided 56,300 48,360 D = unsatisfactory LOS ADT = average daily traffic LOS = level of service v/c = volume -to -capacity due to the proposed improvements. Exceptions include the intersections of Fairview Street at 17th Street and 12th Street, which operate better due to reductions in travel patterns (higher north -south through traffic while lower east -west turning movements at 17th Street) and changes in access (12th Street). The intersection of Fairview Street at 16th Street experiences a worsening of HCM-based delay values in the 2040 p.m. peak hour from an acceptable 24.9 second/vehicle LOS C in the No Project condition to an unacceptable 41.7 second/vehicle LOS E in the Plus Project condition. This represents the calculated delay of the worst -performing movement in a given intersection and is not indicative of the experience of the majority of vehicles traveling through these intersections. As this resulting additional deficient operation is indicative of only the worst - performing movement, in this case the 5 eastbound left -turning vehicles in the p.m. peak hour, this delay value and LOS are not considered to be indicative of the overall intersection and are not considered a significant impact. Implementation of the proposed Project would result in an additional unsatisfactorily operating intersection (the intersection of Fairview Street and Civic Center Drive) compared to the deficient intersections identified under the 2040 No Build condition. Regional growth between the existing and 2040 No Project conditions would contribute to the unacceptable peak -hour operations at the intersection of Fairview Street at Civic Center Drive which could potentially result in a significant impact. As shown in Table 3.17.F, the proposed increase in roadway capacity for Fairview Street south of 16th Street is anticipated to accommodate 2040 traffic growth and north -south regional traffic rebalancing resulting in satisfactory LOS D. This is an improvement over both existing and 2040 No Project overcapacity traffic conditions. In addition, as shown in Table 3.17.F, Fairview Street R:\WKE1702\ISMND\Final ISMND\Fairview Street Bridge Final ISMND.docx (05/26/20) 3-99