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Redwood City Costco Gasoline Expansion ProjE 7.A. - Page 420 August 4,2011 ruye� Pass-by Trips Another key trip characteristic that must be considered is that of pass-by trip capture. Pass-by trips represent members (and trips) that are currently traveling on the street adjacent to the site (Middlefield Road) for some other primary purpose (such as a trip from work to home) and stop into the site en route during their normal travel. As such, pass-by trips do not result in a net increase in traffic on the surrounding transportation system and, typically, their only effect occurs at the site access driveways where they become turning movements. Table 2 shows that, based on the surveys collected at the Redwood City Costco Gasoline facility, on average 22% of the trips during the weekday p.m. peak hour and 29%of the trips during the weekend midday peak hour can be classified as pass-by trip capture from the surrounding street system. This is lower than the average capture rate quoted in ITE Trip Generation for typical service stations (58% in the a.m. and 42% in the p.m.) and, again, is attributable to the unique travel characteristics that result from Costco's membership requirements. Diverted Trips The final type of trip to consider is diverted trips. Diverted trips represent members (and trips) that are currently traveling on the surrounding street system in the site vicinity again for some other primary purpose (such as a trip from work to home) and divert from their normal route to travel to Costco during their normal.An example would be someone who normally travels on Woodside Road on their trip home from work who diverts off of Woodside Road to travel on Middlefield Road to the Costco site. As such, diverted trips do not result in a net increase to those intersections further from the site that they normally travel through but they do become additional trips on the roadways along their diverted route and at the site driveways. Table 2 shows that, based on the surveys collected at the Redwood City Costco Gasoline facility, on average 59% of the trips during the weekday p.m. peak hour and 52%of the trips during the weekend midday peak hour can be classified as diverted trips. Comparison to Previous Trip Generation Estimate A trip generation estimate was prepared for the existing fuel station as part of the EIR process in 2006. The estimate was based on KAI's database of trips generated by Costco fuel stations at the time the EIR was prepared. The trip generation estimate in the EIR also included an estimate in the increase in trips expected due to the warehouse expansion and relocation. However, full existing site driveway counts (prior to the warehouse expansion) were not included in the 2006 EIR. As such, there is no data available to compare the overall site's existing trip generation to its trip generation prior to the warehouse expansion and fuel station addition. The only direct comparison that can be made is to compare the trip generation assumed in the 2006 EIR for the fuel station itself to the actual Kittelson&Associates,Inc. Boise,Idaho