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7.B. - Page 61 <br /> Redwood City Chapter 4.Environmental Impact Analysis <br /> Table 4.3-3 shows that,based on the surveys collected at the existing fueling center,on average <br /> 59 percent of the trips during the weekday PM peak hour and 52 percent of the trips during the <br /> weekend midday peak hour can be classified as diverted trips. <br /> The proposed modifications would include the addition of 8 fueling stations to the fueling center <br /> and would increase sales volume from a current annual throughput of approximately 9 million <br /> gallons to a projected maximum of 18 million gallons (Costco 2012).To determine the appropriate <br /> peak hour trip generation for the 20-station fueling center,data (peak hour volumes,fueling <br /> positions,and sales volumes) from other Costco wholesale centers in the United States that have <br /> similar characteristics as the project with the proposed modifications were reviewed.Based on the <br /> detailed analysis conducted by Kittelson&Associates,Inc. (2012b),there is no direct correlation <br /> between peak hour trip generation and fuel sales volume and between peak hour trip generation <br /> and number of fueling positions.Therefore,the expected trip generation as a result of the proposed <br /> modifications was estimated by evaluating the Trip Generation Manual (Institute of Transportation <br /> Engineers 2008) and trip generation patterns seen at other Costco Gasoline facilities including those <br /> with five islands and those with sales volume equal to or greater than that in Redwood City.Detailed <br /> discussions of the trip generation research and the resulting recommendation are included in <br /> Appendix B.Table 4.3-3 summarizes the projected total trips and net new trips that would result <br /> from the project with the proposed modifications.The total projected trips are estimated based on <br /> the trip generation data at other Costco Gasoline facilities with five islands.The net new trips were <br /> calculated by deducting the internal trips,pass-by trips,and diverted trips that were observed at the <br /> existing facility. <br /> Addendum No.2 to the Environmental Impact Report for 4-16 September 2012 <br /> the Redwood City Costco Wholesale Project ICF 00154.12 <br />