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• Fourth Street at Cabrillo Park Drive —The intersection of Fourth Street at Cabrillo Park <br />Drive currently experiences an acceptable LOS (LOS C or better) in both the AM and <br />PM peak hours. The addition of background traffic growth and traffic from the Overlay <br />Zone is expected to reduce LOS to LOS F in the PM peak hour. The recommended <br />mitigation for this intersection is the construction of a westbound right turn lane, a <br />northbound right turn lane, and a southbound right turn lane, and restriping to change <br />the lane configuration of the north/south approaches. The northbound and southbound <br />approaches should be controlled by a split phase intersection control and restriped to <br />provide one left, one shared through -left, one through, and one right turn lane. These <br />improvements are expected to fully mitigate impacts to LOS D. <br />• 1-5 Northbound Ramps and Fourth Street —The intersection of the 1-5 northbound <br />ramps and Fourth Street is expected to operate at a poor LOS (LOS F) in the PM peak <br />hour with the addition of background traffic growth and traffic from the Overlay <br />Zone. The recommended mitigation for this intersection is the construction of a second <br />westbound right turn lane. This improvement will fully mitigate traffic impacts to LOS <br />C. However, as this intersection is outside the jurisdiction of the City of Santa <br />Ana, the City cannot ensure implementation of this improvement. <br />Seventeenth Street at Cabrillo Park Drive —The intersection of 17th Street at Cabrillo <br />Park Drive currently has a good LOS in both the AM and PM peak hours (LOS B or <br />better). With the addition of background traffic growth and traffic from the Overlay Zone <br />LOS is expected to decline to LOS E in the PM peak hour. The recommended mitigation <br />to address impacts at this intersection is the restriping of the northbound lane <br />configuration to one left, one shared left -through, and one right turn lane, with split <br />signal phasing. These improvements are expected to fully mitigate traffic impacts at this <br />intersection to LOS D. <br />Seventeenth Street at Tustin Avenue —The intersection of 17th Street and Tustin <br />Avenue currently operates at Level of Service C or better in the AM and PM peak hours. <br />Level of service is expected to decline to LOS E in the AM peak hour due to growth <br />in background traffic and traffic from the Overlay Zone. The recommended mitigation <br />for this intersection is the construction of a third northbound through/right turn lane and <br />designating the lanes to allow vehicles to turn right from the right turn lane and from <br />the adjacent (new) through lane. These improvements would fully mitigate traffic <br />impacts at this intersection to LOS D. <br />First Street at Prospect Avenue —The intersection of 1st Street at Prospect Avenue is <br />currently operating at LOS A in the AM and PM peak hours. Background traffic growth <br />and traffic from the Overlay Zone is expected to cause a decline in LOS to LOS E in the <br />PM peak hour. The increase in V/C at this intersection is above the impact threshold <br />of 0.03 for the City of Tustin. The recommended mitigation for this intersection is the <br />construction of a northbound right turn lane and northbound right turn overlap signal <br />Cabrillo Town Center City of Santa Ana <br />Technical Memorandum August 2023 <br />City Council 18 — 620 10/3/2023 <br />