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7.A. - Page 149 �/holesale Redwood City GDF Expansion <br /> Air Quality/Climate Change Analysis <br /> Page 15 <br /> project would have a less than significant impact on localized carbon monoxide concentrations. <br /> (BAAQMD, 2011b, pages 3-3 to 3.4.) <br /> Table 6. Local Carbon Monoxide Impacts Significance Thresholds. <br /> Averaging Time Concentration (parts per million) <br /> 1 Hour 20 ppm <br /> 8 Hours 9.0 ppm <br /> Vehicle Queuing Impacts on Ambient Air Quality. <br /> The 2007 Certified EIR evaluated the impacts of vehicle idling associated with queuing at the <br /> gasoline dispensing facility by conducting an analysis similar to that performed for carbon <br /> monoxide "hot spots." Short-term ambient concentrations of carbon monoxide, nitrogen dioxide, <br /> and respirable particulate matter associated with increased vehicle queuing at the GDF were <br /> modeled and compared to the applicable California or federal standard (whichever was more <br /> health-protective). Table 7 summarizes the relevant significance thresholds (City of Redwood <br /> City, 2006, Table 4.5-8). Note that the nitrogen dioxide threshold in Table 7 has been updated <br /> from the threshold presented in the 2007 Certified EIR Table 4.5-8 to reflect the new federal <br /> ambient one-hour standard of 100 parts per billion, or 188 micrograms per cubic meter (�g/m3). <br /> Table 7. Vehicle Queuing Significance Thresholds. <br /> Pollutant Averaging Time Concentration (micrograms per cubic meter) <br /> 1 Hour 23,000 �g/m3 <br /> Carbon Monoxide (CO) <br /> 8 Hours 10,000 �g/m3 <br /> Nitrogen Dioxide (NOZ) 1 Hour 188 �g/m3 * <br /> Respirable Particulate 24 Hours 50 �g/m3 <br /> Matter (PM,o) <br /> ( *When the 2007 Certified EIR was prepared, the California 1-hour NO2 standard was 470 �ag/m ) <br /> Odors. <br /> The Bay Area AQMD recommends qualitative assessment of odors. A proposed project that <br /> would result in locating a new odor source should consider the screening level distances and <br /> the complaint history of the odor source. The District recommends that an odor source with five <br /> or more confirmed complaints per year averaged over three years be considered to have a <br /> significant impact on receptors located within specified odor screening distances. However, the <br /> BAAQMD's guidelines do not recommend a screening distance for evaluating gasoline <br /> dispensing facilities. <br /> Toxic Air Contaminants. <br /> Projects that result in modeled project-level or cumulative risks associated with toxic air <br /> contaminant (TAC) emissions exceeding the thresholds summarized in Table 8 are considered <br /> by the Bay Area AQMD to have a significant adverse impact. <br /> 7/30/2012 <br />