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Redwood City Costco Gasoline Expansion ProjE 7.A. - Page 436 August4,2011 ruye�i influence on trip generation. As such, the profession is moving towards modifying this for the gasoline station land use codes and working on studies that include different independent variables. An ITE paper was just recently published in the June 2011 ITE Journal documenting a study completed by North Carolina State University confirming these methodologies. In particular for Costco Gasoline facilities, membership base (since they are member-only facilities), market area, and adjacent warehouse activity appear to have a much greater influence on the activity levels of the associated fuel stations than whether the facility is 12, 16, or 20 fueling positions (the three typical Costco models). Furthermore,the existing conditions data collected at the Redwood City site itself confirms this as the existing 3 island station is generating essentially the same number of total trips as that seen at many 4 island facilities. Trip Generation Estimate Methodology There are two specific elements that directed the methodology used to prepare a trip generation for the proposed fuel station expansion. The first is that the project is an expansion to an existing fuel station that has been operational for almost 2 years. This creates a very different scenario from evaluating the impacts of a completely new use. Secondly, there are only two existing 5 island Costco Gasoline fuel stations within the continental United States and, therefore, there is a limited sample size upon which to draw for their characteristics. Because of this, detailed and thorough review of trip generation from several approaches was conducted to provide sufficient support and confidence in the evaluation and resulting estimate. To develop the trip generation estimate for the expanded Redwood City fuel station,the following steps were completed: Evaluation and documentation of how the existing activity levels at the Redwood City site (warehouse and fuel station) compare to other Costco locations where trip generation is known (particularly those locations that have 5 island fuel stations) Evaluation and documentation of the range of trip generation seen at other Costco Gasoline facilities including those with 5 islands and those with sales volume equal to or greater than that at Redwood City Preparation of a range of trip generation estimates for the fuel station expansion based on four approaches: o Approach #1 - Using the trip generation observed at other 4 and 5 island Costco Gasoline facilities with equivalent or greater activity and sales than that of Redwood City, Kittelson&Associates,Inc. Boise,Idaho