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Redwood City Costco Gasoline Expansion P�7.A. - Page 218 August 20,2012 ruye o 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 counts that have been collected at the fuel station now that it is operational (presented in Table 2). Table 3 presents this comparison of the trip generation assumed for the fuel station in the 2006 EIR to what it has proven to actually generate based on existing traffic counts. The comparison of the 2011 existing data to the previous estimate used in 2006 is outlined in Table 3 for the weekday p.m. peak hour and weekend midday peak hour. Table 3 Costco Gasoline Trip Generation Comparison Weekday PM Peak Hour Weekend Midday Peak Hour 2011 Actual Difference 2011 Actual Difference 2006 EIR Counts (2011-2006) 2006 EIR Counts (2011-2006) Total Trip Ends 390 400 +10 380 430 +50 Internal Trips (190J (90J (-100J (220J (200J (-20J External Trips 200 310 +110 160 230 +70 Pass-by Trips (60J (70J (+10J (50) (70J (+20J Diverted Trips (80J (180J (+100J (60J (120J (+60J Net New Trips 60 60 +0 50 40 -10 As shown in Table 3,the EIR accurately estimated the total trip ends and net new trip ends that are actually being generated by the Costco Gasoline fuel station during the critical weekday p.m. peak hour now that it is operational. However, using the trip type information available from other Costco Gasoline facilities at the time of the EIR overestimated the number of internal shared trips Kittelson&Associates,Inc. Boise,Idaho