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7.A. - Page 155 �/�/holesale Redwood City GDF Expansion Air Quality/Climate Change Analysis Page 21 concentrations would increase by less than 1 percent of the relevant standards for on-site employees and customers, and would increase by less than one half of one percent of the relevant standards for off-site residents (City of Redwood City, 2006, Table 4.5-8). The 2007 Certified EIR therefore concluded that ambient air quality impacts associated with vehicle queuing would be less than significant. In February 2010, the U.S. Environmental Protection Agency enacted a new federal ambient one-hour NOZ standard of 100 parts per billion, or 188 micrograms per cubic meter (�g/m3). Table 12 updates 2007 Certified EIR Table 4.5-8 to reflect the new federal standard, which is lower than the California one-hour NOZ standard of 470 �g/m3 used in the 2007 Certified EIR. As can be seen in Table 12, the increase in short-term ambient NOZ concentrations due to vehicle queuing would remain less than one percent for on-site employees and customers, and less than one half of one percent for off-site residents. Therefore, the 2007 Certified EI R conclusion that ambient air quality impacts associated with vehicle queuing at a 16-position GDF would be less than significant is unchanged as a result of the new federal NOZ standard. Table 12. Update to 2007 Certified EIR Table 4.5-8 to Reflect Current Standards. Current Modeled Modeled Applicable Employee Resident Averaging Standard Exposure Percent of Exposure Percent of Pollutant Period (�ag/m3) (�ag/m3) Standard (�ag/m3) Standard 1 Hour 23,000 113.4 0.49% 48.5 0.21% Carbon Monoxide 8 Hours 10,000 79.4 0.79% 34.0 0.34% Nitrogen Dioxide 1 Hour 188 1.23 0.65% 0.53 0.28% Respirable Particulate 24 Hours 50 0.35 0.70% 0.15 0.30% Matter(PM�o) (Source: Appendix C.) Based on emission estimates prepared for the proposed Costco Wholesale Redwood City GDF expansion (Appendix B), emissions associated with vehicle queuing at the proposed 20-position facility are expected to be lower than emissions evaluated in the 2007 Certified EIR for a 16- position facility. Even through vehicle queuing is expected to increase 20 percent, from an estimated 75 hours per day for the 16-position facility evaluated in the 2007 Certified EIR to 91 hours per day for the proposed 20-position facility, San Mateo County vehicle emission rates used in the current vehicle queuing analysis are lower than emission rates used in the 2007 Certified EIR.$ As shown in Table 13, vehicle emissions associated with queuing at the proposed 20-position facility are expected to be 30 to 75 percent lower than the queuing emissions associated with the 16-position facility evaluated in the 2007 Certified EIR. As a result, ambient air quality impacts associated with vehicle queuing at the proposed 20-position GDF would remain less than significant. Even though vehicle queuing emissions could increase if the extreme maximum assumption that facility vehicle trips double were used, ambient air quality impacts associated with vehicle queuing at the proposed 20-position GDF would still remain less than significant. (Appendix C, Table C-1 a). $As shown in Appendix C, Table C-1,emission rates used in the current vehicle queuing analysis are 40 to 75% lower than the 2007 Certified EIR vehicle queuing analysis emission rates. See Footnote 1, above, for more information. 7/30/2012