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Memorandum of Understanding for the Master Plan of Arterial Highways Amendment and <br />Irvine Business Complex Agreement Amendment <br />July 1, 2025 <br />Page 4 <br />Amendment to IBC Agreement (City of Irvine and City of Santa Ana Agreement) <br />The existing agreement between the cities of Irvine and Santa Ana related to the IBC <br />identifies four mitigation projects to be funded as follows: <br />Existing Agreement <br />Project <br />Santa Ana Share <br />Irvine Share <br />Red Hill Ave. & Alton Parkway Intersection <br />50% <br />50% <br />Dyer Rd: SR-55 to Red Hill Ave. <br />0% <br />100% <br />Alton Parkway SR-55 Overcrossin <br />50% <br />50% <br />Von Karman Ave. & Barranca Parkway <br />Intersection <br />14% <br />86% <br />The City of Santa Ana's GPU traffic study identified significant traffic congestion on the <br />segment of Dyer Road between the SR-55 and Red Hill Ave. To account for the <br />mitigation requirements subsequently identified in the City of Santa Ana's GPU traffic <br />study, the proposed amendment to the IBC agreement will reduce the City of Irvine's <br />fair share from their original 100%. Staff has negotiated with the City of Irvine for Santa <br />Ana to contribute a maximum of 23% fair share toward the project and, in return, the <br />City of Irvine has agreed to eliminate the City of Santa Ana's responsibility for fair share <br />contributions (14%) to the intersection of Von Karman Avenue and Barranca Parkway <br />project located within Irvine. <br />Staff recommends moving forward with improvements to Dyer Road and City Council <br />has approved Resolutions to apply for grant funding. Grant funding for the design phase <br />of Santa Ana's share of Dyer Road Improvements has been secured and additional <br />grant funding will be pursued for future phases such that the actual amounts contributed <br />by Santa Ana from local funds for the project will be significantly reduced. <br />The following lists the traffic improvement mitigation projects and the respective fair share <br />contributions for each in the proposed agreement: <br />Proposed Agreement <br />Project <br />Santa Ana Share <br />Irvine Share <br />Red Hill Ave. & Alton Parkway Intersection <br />50% <br />50% <br />No change) <br />Dyer Rd: SR-55 to Red Hill Ave. <br />23% <br />77% <br />Alton Parkway SR-55 Overcrossing <br />50% <br />50% <br />No change) <br />Von Karman Ave. & Barranca Parkway <br />0% <br />100% <br />Intersection <br />It is worth noting that at this time there is no determination of when or if the IBC <br />thresholds required for the City of Irvine's fair share to be triggered for the Alton <br />