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recommended mitigation for this intersection is the installation of a traffic signal or a <br />roundabout. Either improvement is expected to result in an improvement to LOS B or <br />better, fully mitigating impacts. <br />• Tustin Avenue and Sixth Street —The intersection of Tustin Avenue and Sixth Street <br />currently operates at LOS D in both the AM and PM peak hours. Level of service is <br />expected to decline to LOS F in the AM and PM peak hours with the addition of <br />background traffic growth and traffic from the Overlay Zone. The recommended <br />mitigation for this intersection is the prohibition of eastbound -westbound cross -traffic <br />through the construction of median islands or diverters. This improvement will fully <br />mitigate the traffic impacts at this intersection. Intersection performance will improve to <br />LOS D. <br />• Fourth Street and Parkcenter—The intersection of Fourth Street and Parkcenter <br />currently operates at LOS B in both the AM and PM peak hours. Growth in background <br />traffic and traffic from the Overlay Zone is expected to result in a decline to LOS F in <br />the PM peak hour. The recommended mitigation for this intersection is the installation <br />of a traffic signal. Impacts will be fully mitigated to LOS B. <br />• First Street and B Street —The intersection of First Street and B Street currently <br />operates at LOS E in the PM peak hour. Growth in background traffic and traffic from <br />the Overlay Zone is expected to result in a decline in LOS to LOS F in both the AM <br />and PM peak hours. The recommended mitigation for this intersection is the <br />installation of a traffic signal. Impacts will be fully mitigated to LOS B at this intersection. <br />However, as this intersection is outside the jurisdiction of the City of Santa Ana, the City <br />cannot ensure implementation of this improvement. <br />Summary <br />The potential intersection improvements described above are expected to fully mitigate all traffic <br />impacts to an acceptable LOS (LOS D or better), except at one intersection (Fourth Street at <br />Tustin Avenue), as noted above. The Mitigation Measures MM-OZ 4.12-2 through MM-OZ <br />4.12-4 shall be implemented to reduce the potential impacts that would occur with <br />implementation and full buildout of the Overlay Zone. Some of the significantly impacted <br />intersections would be located outside of the City's jurisdiction; thus, the City of Santa <br />Ana cannot ensure implementation of the suggested improvements. In addition, at least <br />one of the identified intersections would not be mitigated to a less -than -significant level even <br />with mitigation. Therefore, although it is assumed that a majority of the identified <br />improvement measures could be implemented to mitigate impacts, due to a variety of <br />constraints, at least one (if not more) of the intersections would not be improved to an <br />acceptable level of service. Consequently, full buildout of the Overlay Zone would result in an <br />increase in traffic that is substantial in relation to the existing traffic load and capacity of the <br />street system, and this impact was determined to be significant and unavoidable. <br />Cabrillo Town Center City of Santa Ana <br />Technical Memorandum August 2023 <br />City Council 18 — 622 10/3/2023 <br />