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SUNOL BOULEVARD/I-680 IMPROVEMENTS PA&ED forecasts. The comparison is necessary to support this decision. 2.2.1 Check Validation of Base Year Model in Study Area. Through our travel demand forecast and operations work for the I-680 Express Lane Project, Fehr & Peers recognizes that capacity changes at the I-680/Sunol Boulevard interchange in Pleasanton could have a regional effect on travel patterns. First, the capacity changes would allow more efficient vehicle flow along the corridor, attracting drivers. Second, the capacity changes would deliver more traffic to and from the I-680 corridor,which in turn would change downstream freeway mainline traffic operations and potentially change the extent of peak period congestion through the study area. As such, the traffic forecast tool, and subsequent operations tools,must be broad enough to capture these sub-regional changes in travel patterns. Fehr&Peers will complete the following work under this task. 1. Check Validation of Base Year Model in the Study Area. Fehr&Peers shall perform a supplemental model recalibration and sub-area validation using the existing data collected for this project to ensure confidence in the model's results within the study area. Validation checks and model refinements will be made for the base year AM and PM peak periods. The sub-area validation will comply with Caltrans standards 2. Prepare Year 2040 Model Inputs. Available ABAG projections extend to the year 2040. The model road network will be reviewed to ensure that it accurately reflects the expected road system in the design year and the model land use will be confirmed with the cities of Dublin,Pleasanton and Livermore.Any changes to network or land use will be coordinated with Alameda CTC staff and Caltrans before proceeding. 3. Develop Design Year Traffic Forecasts. Using the year 2040 inputs described above, Fehr & Peers shall run the Alameda CTC model to establish traffic demand estimates for the year 2040. We will calculate the growth in link volumes projected by the model between the base year and year 2040, and add that growth to the existing volumes to determine year 2040 volumes for the AM and PM peak periods and balance the volumes as appropriate.Linear extrapolation of the existing conditions demand volumes and year 2040 volumes will be used to develop Design Year (assumed to be year 2045) traffic volumes. The resulting volumes will represent the No Build alternative. The model will then be modified to reflect the project and rerun to establish Build alternative forecasts. The overall traffic demand in the study area under the Build alternative is anticipated to be consistent across all build alternatives. Where possible, this analysis will rely on the previously completed I-680 Express Lane project forecasts. 4.Develop Opening Year Traffic Forecasts.Fehr&Peers shall work with the Project Team to define the opening year for analysis purposes and then develop opening year traffic volume forecasts for the AM and PM peak periods by applying linear interpolation between the existing volumes and the design year forecasts. As the assumed opening and design years for the I-680/Sunol Boulevard interchange project match the assumed opening and design years for the I-680 Express Lanes project (Year 2025 and Year 2045, respectively), the forecasts from the 1-680 Express Lanes project will be utilized for the I-680/Sunol Boulevard interchange project,where possible. Apri110,2020 7