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RE7.A. - Page 251 Expansion Project#:11637.0 Auyus<<v,LV1L Page 39 APPROACH #3: TRIP GENERATION BASED ON BEFORE &AFTER DATA FROM OTHER EXPANSION SITES In developing a trip generation estimate for the project, it is important to recognize that the fuel station exists today and the proposed project is an expansion to this existing use and not the addition of a new use. Furthermore, the market area of the Redwood City Costco is already defined through existing membership and operations.As such, and as demonstrated by data at other sites, it's unlikely that the trip generation of the fuel station will increase directly in proportion to the increased number of fueling positions. More likely is that the additional fueling positions will serve to more efficiently and effectively process the current peak demand at the fuel station, thus reducing wait times, vehicle queuing, and vehicle idling. To test this assumption, before and after data from other Costco Gasoline fuel station expansion sites was reviewed to determine a more representative relationship between new trip generation and the addition of fueling positions to an existing station. Costco has not expanded any other site from 3 islands to 5 islands, however, there are multiple examples of sites expanded from 3 islands to 4 islands and one example of a site expanded from 4 islands to 5 islands. KAI worked with Costco to identify six other Costco Gasoline locations that have expanded in size. The comparable expansion sites identified were: Salem, Oregon (3 to 4 islands) Folsom, California (3 to 4 islands) Kona, Hawaii (3 to 4 islands) Vancouver,Washington (3 to 4 islands) Orem,Utah (3 to 4 islands) Waipio, Hawaii (4 to 5 islands) In order to work with a representative sample size, Costco provided fuel transactions collected on an hourly basis for an entire two month period before and an entire two month period after the expansion of each of these fuel stations. Only data that was collected during similar months of the year prior to and after the expansion was included in this summary(for example,fuel transactions for the months of March and April before the expansion were compared to fuel transactions for the months of March and April after the expansion). The data reviewed for these sites was all from 2008 or prior as the results of data pulled from other sites in addition to the six listed showed that the recent economic conditions in 2009 and 2010 has also influenced activity levels at certain Costco Gasoline locations. For example, data from a site in Wilsonville, Oregon (which underwent an expansion in early 2009) actually showed a decrease in the level of activity in comparing 2008 and 2009 transaction levels.As such,the data from this site was not used. The results of this before and after comparison for the six listed sites are provided in Table 16.Again, Table 9 contains additional information about these representative sites and how their characteristics compare to those of the Redwood City site. Kittelson&Associates,Inc. Boise,Idaho