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RE7.A. - Page 253 Expansion Project#:11637.0 Auyus<<v,LV1L Page 41 Table 17 Approach #3: Expanded (20 Fueling Position) Redwood City Costco Gasoline Trip Generation Estimate Based on Before &After Data—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 200 200 400 220 220 440 20 20 40 Internal Trips(22%PM) (45) (45) (90) (50) (50) (100) (5) (5) (10) External Trips 155 155 310 170 170 340 15 15 30 Pass-by Trips(22%PM) (35) (35) (70) (35) (35J (70) (0) (0) (0) Diverted Trips(59%PM) (90) (90) (180) (100) (100) (200) (10) (10) (20) Net New Trips 30 30 60 35 35 70 5 5 10 As shown in Table 17, applying the percent increase seen at other expansion locations would result in a trip generation estimate for the expanded Redwood City Costco Gasoline fuel station of approximately 440 total trip ends and 70 net new trip ends during the weekday p.m. peak hour. This equates to an increase of 40 additional total trip ends and 10 additional net new trip ends over what the site is currently generating during the weekday p.m. peak hour. Applying this approach yields very similar results to Approach #1 which was based on the trip generation seen at other 4 and 5 island locations with equal or greater activity to that of Redwood City under existing conditions. Even conservatively applying double the growth rate seen at other Costco Gasoline expansion locations to account for the fact that the project proposes to expand the facility by 8 fueling positions (i.e., applying a 19.2% growth instead of the 9.6% growth seen at the example locations) would result in an estimated increase of 80 total weekday p.m. peak hour trips ends. This is less conservative than using Approach#2 based on the highest trip generation observed at existing 5 island facilities. APPROACH #4: TRIP GENERATION BASED ON A LINEAR INCREASE WITH SIZE All of the above data indicates that trip generation at Costco Gasoline facilities is not directly related to the number of islands (or fueling positions). In fact, the transportation profession in general is moving towards modifying the gasoline station land use codes and working on studies that include different independent variables for trip generation. In particular for the case of 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). The Redwood City site itself confirms this as the existing 3 island station is generating Kittelson&Associates,Inc. Boise,Idaho