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Redwood City Costco Gasoline Expansion ProjE 7.A. - Page 254 August 20,2012 ruye v� essentially the same number of total trips as would be estimated using the characteristics observed at 4 island facilities. This said, to prepare a fully complete range of trip generation estimates for the project, a fourth approach was applied assuming a straight linear increase in trips with the number of fueling positions even though this is not expected to occur. The trip generation identified with this approach is summarized in Table 18. Table 18 Approach #4: Expanded (20 Fueling Position) Redwood City Costco Gasoline Trip Generation Estimate Based on Straight Linear Increase—Weekday PM Peak Hour Existing Site 5 Island Expanded Trip Generation Trip Generation Difference In Out Total In Out Total In Out Total Total Trip Ends 200 200 400 330 330 660 130 130 260 Internal Trips(22%PM) (45) (45) (90) (70) (70) (140) (25) (25) (50) ExternalTrips 155 155 310 260 260 520 105 105 210 Pass-by Trips(22%PM) (35) (35) (70) (55) (55) (110) (20) (20) (40) Diverted Trips(59%PM) (90) (90) (180) (150) (150) (300) (60) (60) (120) Net New Trips 30 30 60 55 55 110 25 25 50 As shown in Table 18, developing a trip generation estimate applying a straight linear increase in trips with the size of the fuel station yields an estimate of 660 total weekday p.m. peak hour trip ends. This is 32% higher than the actual trip generation seen at any Costco Gasoline facility where data is available, including any existing 5 island location. As such, it appears that using this approach does not yield a reasonable or realistic estimate for the likely increase in trips at the Redwood City location. APPROACH #5: TRIP GENERATION BASED ON GENERIC RATES IN THE ITE TRIP GENERATION MANUAL The straight linear increase in trips presented in Approach #4 is consistent with the methodology for fuel stations in the ITE manual Trip Generation. The manual provides trip rates based on the number of fueling positions from data collected at various fuel stations but is not based on information or data specific to Costco. As described previously in this memorandum, Costco is a very specific use that has unique trip generation characteristics based on membership requirements and the unique nature of Costco sales and operations. Even though the generic trip generation in the ITE manual is not specific to Costco, a trip generation estimate was developed using those rates as a comparison to Kittelson&Associates,Inc. Boise,Idaho