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7.B. - Page 240 �ne Expansion Project#:11637.0 HU(�.USL LV LV1L Page 5 to a typical standalone station) because they have another primary purpose for visiting the site (that being a trip to the warehouse). Internal Trips A key finding from the data collection is that approximately 22% of the weekday p.m. and 47% of the Saturday midday peak hour trips to and from the Redwood City Costco Gasoline facility are internal capture trips. Internal capture trips account for those members who patronize both the warehouse and the gasoline pumps during a single visit to the Costco site. As such, although they account for a trip to both the warehouse and the fuel station, they only account for one overall vehicle trip to the site and on the surrounding transportation system. 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.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 Kittelson&Associates,Inc. Boise,Idaho