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Proposed Costco Wholesale Redwood City GDF Expansion 7.A. - Page 154 Air Quality/Climate Change Analysis Page 20 Table 11. Summary of Annual Criteria Pollutant Emissions Changes Associated With Proposed Project Operation. Emissions (tons per year) Project Component ROG NOx PM�o PM2.5 CO SOZ Proposed Expansion (20 Positions) Vehicle Trips 0.22 0.24 0.26 0.07 2.29 0.00 Vehicle Queuing 0.01 0.01 0.00 0.00 0.10 0.00 Gasoline Delivery Trucks 0.01 0.22 0.01 0.01 0.05 0.00 Vehicle Refueling 3.02 Annual Emissions (tons/year) 3.25 0.46 0.27 0.08 2.43 0.00 Extreme Maximum Assumptions Vehicle Trips 0.64 0.71 0.78 0.21 6.83 0.01 Vehicle Queuing 0.19 0.22 0.01 0.01 2.42 0.00 Gasoline Delivery Trucks 0.01 0.22 0.01 0.01 0.05 0.00 Vehicle Refueling 3.02 Annual Emissions (tons/year) 3.86 1.15 0.80 0.23 9.30 0.01 BAAQMD Siqnificance Thresholds 10 10 15 10 None None (tons/year) Significant? No No No No N/A N/A (Source: Appendix B. Values may not sum to total due to rounding.) Carbon Monoxide "Hot Spots". The 2007 Certified EIR evaluated the potential for carbon monoxide "hot spots" associated with relocating the main site entrance from Charter Street to Willow Street and found impacts to be less than significant. The proposed 20-position GDF is expected to increase vehicle trips through the intersection of Middlefield Road and Willow Street to approximately 2,615 vehicles per peak hour.' Since this is far below the Bay Area AQMD's conservative screening threshold of 44,000 vehicles per peak hour, the project would have a less than significant impact on carbon monoxide "hot spots." Queuing Impacts on Ambient Air Quality. Based on modeling conducted for the 2007 Certified EIR, idling emissions associated with vehicle queuing would result in only small increases in ambient short-term air pollutant concentrations. Dispersion modeling demonstrated that ambient short-term CO, NO2, and PM,o 'The July 30, 2012 Preliminary Transportation Assessment indicates that the proposed 20-position GDF will increase external trips by 80 trips/peak hour(Kittelson, 2012a,Table 22). Correcting for pass-by trips that already would be passing through the intersection (10 trips/hour)leaves an estimated 70 additional trips/hour through the intersection of Middlefield and Willow. The Preliminary Transportation Assessment also shows the current peak hour traffic count through the Middlefield/Willow intersection to be 2,545 vehicles/hour(Kittelson, 2012a, Table 4). Total estimated traffic volume through the intersection with the proposed 20-position GDF therefore would be approximately 2,615 vehicles/peak hour. 7/30/2012