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Redwood City Costco Gasoline Expansion ProjE 7.A. - Page 452 <br /> August4,2011 ruye 3i <br /> o Approach #3 - Preparation of a trip generation estimate based on before and after <br /> data from other Costco Gasoline expansion sites and the percent increase in trips <br /> seen at those locations <br /> o Approach #4 - Preparation of a trip generation estimate assuming a straight linear <br /> increase in trips proportionate to the increase in fueling positions (i.e., a 66% <br /> increase in trips) <br /> The four approaches result in a trip generation estimate range varying from 430 total <br /> weekday p.m.peak hour trips to 660 total weekday p.m. peak hour trips. <br /> It is clear from all of the data presented that Approach #4 (660 total weekday p.m. peak <br /> hour trips) is unreasonable and unrealistic <br /> o All of the data indicates that trip generation is not directly linear with number of <br /> fueling positions <br /> o Furthermore, applying that approach yields an estimate that is higher than the <br /> actual trip generation observed at any existing Costco Gasoline location where <br /> data has been collected (including sites with significantly more activity than that <br /> of Redwood City) <br /> While the trip generation estimates at the lower end of the range (430 total weekday p.m. <br /> peak hour trips and 440 total weekday p.m. peak hour trips) are likely reasonable, to be <br /> conservative we recommend that the trip generation estimate developed using the <br /> highest observed trip generation at an existing 5 island location <br /> o While this is likely an overestimation of the trip generation impacts given the <br /> relative activity at that site compared with Redwood City, it will ensure the <br /> analysis is conservative and extremely defensible. <br /> The recommended trip generation estimate for the proposed Redwood City Costco <br /> Gasoline expansion project equates to an increase of 100 additional total trip ends and 20 <br /> additional net new trip ends over what the site is currently generating during the <br /> weekday p.m. peak hour. <br /> Five Island (20 Fueling Positionl Costco Gasoline Operations <br /> Data collected at the two existing 5 island (20 fueling position) Costco Gasoline facilities <br /> in the continental U.S. shows that even though one of those locations generates about 100 <br /> Kittelson&Associates,Inc. Boise,Idaho <br />