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Mr. Keyvan Pirbazari, PE PBS &J September 10, 2008 Page 2 Task 2 — Traffic Forecast $7,200 Original Scope: Refine the long -range (2025) traffic forecasts included in the Hutton Center Residential Development Traffic Study, previously prepared on December 15, 2004, based on existing peak hour traffic count data. The initial estimates of the peak hour turning movement volumes will be reviewed for reasonableness, including the review of traffic flow conservation and peak -to -daily volume ratios. Where necessary, the initial model estimates will be adjusted to achieve flow conservation, reasonable growth, and plausible diversion between parallel routes. It is assumed that Caltrans will accept 2025 as the analysis year for the PRS /PS traffic analysis and additional model runs will not be required. If Caltrans wants the analysis based on 2030 or 2035 values, however, it is assumed that the required traffic volumes will be extrapolated from the 2025 traffic volumes in the Hutton Center Residential Development Traffic Study, and a model run will not be necessary. Work Performed: The approach and parameters of Task 2 has been changed substantially based on the direction provided by OCTA and Caltrans. The original analysis performed was based on model forecasts and not the 2025 traffic forecast included in the Hutton Center traffic study to 2030 conditions as described in the original scope of work.. Using the "unconstrained" OCTAM traffic model forecasts required a significant amount of additional time and effort than was anticipated in the original scope of work. Additional Scope: Refine the long -range (2030) traffic forecasts to demonstrate consistency with the following: • The Hutton Center Residential Development Traffic Study • Mainline Freeway forecasts using the Freeway Performance Measurement System (PeMS) data. • 2007 traffic count data • Recent draft traffic operations analysis in support of the SR -55 PSR. Traffic analysis in Task 4 through Task 5 have also been revised due to traffic forecast changes. Task 3 — Traffic Study Scoping $0 Original Scope: Prepare and present traffic study scope to City of Santa Ana, Caltrans and City of Irvine staff for review and approval. Work Performed: PBS &J requested that the traffic study be submitted to Caltrans for their review without prior review of the traffic study scope by Caltrans. Task 3 is completed since Caltrans has now reviewed the traffic study. Additional Scope: No additional scope.