AgdaPkt 2010-02-01 clsd and regular

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Saltworks Proposal- Transportation Group Summary Report (22 January 2010) 7A - ATTACHMENT NO.4 Page 16 scale project on the Peninsula. The review showed that the traffic volumes from the project would not simply be added to the network, but would also replace and/or displace existing trips. However, as stated previously, neither of the available models as currently configured can provide the traffic volume projections and VMT estimates at both the local and regional level for the project. In addition, neither model has a validated mode choice model for preparing transit ridership estimates. Therefore, a true assessment of the impacts of the proposed Saltworks project is not possible without significant adjustments to the existing base models. 3.2. 1 Trip Generation Estimates Hexagon Transportation Consultants prepared initial traffic and transit estimates to support the transportation system presented in the application. Trip generation estimates were developed using a version of the City of Redwood City's model and rates from the Institute of Transportation Engineers (ITE) Trip Generation publication. The results are presented in Table 1. It should be noted that the preliminary modeling for the Saltworks project used different demographic factors than would be used for most areas of Redwood City. The changes to the model's demographic inputs for the Saltworks project were made to reflect the following factors: the area would have a circulator transit system providing connections between Caltrain, the downtown, and the future ferry terminal; there would be a parking management program that would potentially reduce car ownership; there would be a transportation management association providing alternative modes of travel; and there would be services within easy walking/biking distance to the residential uses. For the ITE residential trip estimates, a factor was applied to account for internalization due to non-work trips (school/shopping) and to account for the available transit alternatives. The results of these calculations by Hexagon are shown in the table below. The model's trip generation estimates for the project are between ITE estimates with and without the internalization reduction. Therefore, the model results were considered reasonable to use as an estimate of the magnitude of vehicles trips generated by Saltworks. The preliminary model was used to prepare peak hour volume estimates, which were approximately 7,000 peak hour trips, which represents a peak hour factor of 9 percent of the daily volumes. TABLE 1 HEXAGON'S PRELIMINARY DAILY TRIP GENERATION COMPARISON Model Output ITE Trip Generation TOO/Mixed Use NET ITE Trips Use Vehicle Trips Rate 1 Size2 Trips Reduction - 29%3 With Reduction Residential 5.81 12,000 69,720 (20,219) 49,501 Office 11.01 1,000 11,010 11,010 Retail 42.94 140 6,012 6,012 Total Project 76,767 86,742 66,523 Source: Hexagon Transportation Consultants Notes: 1. Trip Generation Rates based on ITE Trip Generation, 8th Edition, 2008. Residential used the rate for Condos (230) which was used to reflect a mixture of single family, condominium, and multi-family apartment dwelling units. Office is General Office (710) and Shopping Center (820). 2. Size for residential is expressed in number of dwelling units. Size for Office and Retail is expressed in KSF. 3. Source - Studies: Mixed-use, walkable development alleviates traffic. New Urban News Volume 13, Number 6, September 2008. Mixing it up. Urban Land: Land Writes, August 2008. 9