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FEHRk PEERS MEMORANDUM Date: May 13, 2011 To: Brian Krcelic, TYLin Josh Pack, City of Pleasanton From: Julie Morgan, Fehr & Peers Subject: 1-580/Foothill Road Interchange, Scope for Additional Traffic Forecasting SJ10-1207 At the May 10 meeting with Caltrans, it was discussed that the Project Report for the I- 580/Foothill Road interchange project is about ten years old, and that the traffic forecasts presented in that report were for the year 2025. Phil Cox, head of forecasting for District 4, recommended that updated forecasts be prepared for the year 2035, using the most recent regional land use projections currently available. The following presents our proposed scope of work for this effort. Scope of Work Task 1 - Review Forecasting Method with Caltrans Prepare a brief memo outlining our proposed approach to the forecasting process, and submit to Caltrans for review and acceptance, before proceeding with developing the updated forecasts. Task 2 - Collect Traffic Counts There are three existing study intersections in this area: San Ramon Road/Dublin Boulevard, San Ramon Road/I-580 WB Off-Ramp, and Foothill Road/Dublin Canyon Road. In order to support the development of new traffic forecasts for these intersections, it will be very helpful to have recent traffic counts. If such data is available from the city, then no new data collection will be needed. If such data is not currently available, we would collect new AM and PM peak hour turning movement counts at these three intersections. We will also get data as available from Caltrans for the ramps at the I-580/Foothill Road interchange. Task 3 - Prepare Model Inputs We suggest that the CCTA model will be the most appropriate choice for this application. The CCTA model covers the Tri-Valley area, is regularly maintained and updated, and has been used for other projects in the vicinity (such as the 1-580/1-680 interchange project). The CCTA model currently contains regional land use projections reflecting ABAG Projections 2007. In order to produce forecasts that reflect more recent economic development trends, we recommend updating the land use inputs to be consistent with ABAG Projections 2009 at a city-wide level. These updates will be needed for both the base year (2010) and future year (2035) models. We will also review the transportation network to ensure that major capital improvements anticipated to be completed by 2035 are reflected in the model. 100 Pringle Avenue,Suite 600 Walnut Creek,CA 94596 (925)930-7100 Fax(925)933-7090 vnvw feh ra n d pee rs.co m