25G - AMENDMENT FOR GENERAL PLAN IMPACT REPORT

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Plan Update EIR. This coordination will include coordination with OCTA on producing OCTAM traffic model forecasts and in the MPAH amendment process. To support the traffic modeling, IBI Group will coordinate with OCTA and be responsible for providing details regarding the roadway reclassification and land use/socioeconomic data for use in two model runs. OCTA will be responsible for updating the OCTAM model to include MPAH reclassifications, and IBI will be responsible for inputting land use changes and running the model for the new land use. IBI Group will lead the coordination effort with OCTA during the review of the traffic study results, including meetings (up to 4 meetings) with OCTA and adjacent cities, working with the City of Santa Ana to draft and receive letters of support from adjacent cities, and attending the OCTA Board meeting for review of the proposed MPAH reclassifications. Traffic Modeling and Analysis Traffic Modeling This task will involve a review of the City -proposed land uses changes In the General Plan Update (Scenarios 1 and 2), including any special transportation needs or considerations. IBI Group will coordinate with OCTA to obtain a new OCTAM model forecast of future traffic conditions in the study area. The coordination will include providing OCTA with the proposed land use mix (land use type and size) for each of the two scenarios proposed by the City. Per discussions with OCTA, IBI Group will be responsible for incorporating socioeconomic data forecasts associated with the future land use scenario into OCTAM. IBI Group will also be responsible for running the OCTAM model to develop forecasts for traffic volumes with the proposed land use changes. OCTAwill input all proposed MPAH roadway reclassifications into OCTAM. IBI Group will be responsible for running OCTAM to generate forecasts for two land use scenarios. Once the forecast for the higher land use scenario is generated, IBI Group will conduct an initial analysis and review to determine the potential magnitude and number of significant traffic Impacts. The purpose of this initial review will be to determine if the second model run with the lower -intensity land use is required. Only a single future General Plan Update land use scenario will be carried forward through the full traffic analysis and VMT analysis. The purpose of this preliminary, new review is to determine the scenario that will proceed. For both scenarios, IBI Group will post -process forecast intersection volumes using a procedure based on the Transportation Research Board methodology to generate future forecast turning movements at intersections. Post - processing refines the model link level forecasts to produce reasonable turning movement volumes at the intersections. Future roadway segment volumes will be forecast based on growth rates obtained from the model. IBI Group has assumed that this scope does not include the development of a second VMT forecast. Only one VMT forecast, consistent with the selected land use scenario, would be generated, consistent with the base scope of work. Update Existing Conditions Analysis The Existing Conditions Analysis for the General Plan Update FIR was previously completed by IBI Group. This document includes analysis of 30 intersections and 50 roadway segments, leaving 10 locations of each type available for future analysis once planned land use changes were known. With the finalization of the land use plan and incorporation of the Circulation Element Update roadway changes and study locations, the Existing Conditions February 7, 2020 (revised April 9, 2020 1 Page 3 25G-7