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7.B. - Page 73 Redwood City Chapter 4.Environmental Impact Analysis have a less-than-significant impact on localized CO levels ("hot spots").If a project would increase traffic volumes at affected intersections by less than 44,000 vehicles per hour,the project would have a less-than-significant impact on localized carbon monoxide concentrations (Bay Area Air Quality Management District 2011). Vehicle Queuing Concentrations The impacts of vehicle idling associated with queuing at the fueling center was evaluated by conducting an analysis similar to that performed for CO "hot spots."Short-term ambient concentrations of CO3 NOa,and PM10 associated with increased vehicle queuing at the fueling center were modeled and compared to the applicable CAAQS or NAAQS (whichever was more health- protective).Table 4.4-3 summarizes the relevant significance thresholds. Table 4.4-3.Vehicle Queuing Concentration Thresholds Pollutant Averaging Time Concentration(µg/m3') NOz 1 hour 188 CO 1 hour 23,000 CO 8 hours 10,000 PM10 24 hours 50 Source:Ashworth Leininger Group 2012. Notes: * µg/m3=micrograms per cubic meter. Toxic Air Contaminants Projects that result in modeled project-level or cumulative risks associated with TAC emissions that exceed the thresholds summarized in Table 4.4-2 are considered by the BAAQMD to have a significant adverse impact.Because gasoline dispensing facilities do not emit PM2.5 emissions, thresholds related to PM2.5 are not relevant to this assessment. Odors The BAAQMD recommends that an odor source with five or more confirmed complaints per year averaged over three years be considered to have a significant impact on receptors located within specified odor screening distances.However,the BAAQMD's guidelines do not recommend a screening distance for evaluating gasoline dispensing facilities. Impact Discussion As discussed below,with implementation of the mitigation measures and standard conditions identified in the 2007 FEIR,the proposed modifications to the project would not result in any new or more severe significant air quality impacts beyond those previously addressed in the 2007 FEIR and 2007 Addendum No. 1,and no other changes in circumstances,or new information exists that would necessitate any major modification of the air quality discussions in the 2007 FEIR and 2007 Addendum No. 1. Addendum No.2 to the Environmental Impact Report for 4 Z8 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12