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Proposed Costco Wholesale Redwood City GDF Expansion 7.A. - Page 148 Air Quality/Climate Change Analysis Page 14 Table 4. Construction-Related Criteria Pollutant Emissions Significance Thresholds. Pollutant/Precursor Daily Average Emissions (pounds/day) Proiect-Level and Cumulative Impacts: Reactive Organic Gases (ROG) 54 Nitrogen Oxides (NOx) 54 Respirable Particulate Matter (PM,o) 82 (exhaust emissions only) Fine Particulate Matter (PM2.5) 54 (exhaust emissions only) PM,o/PM2,5 Fugitive Dust Best Management Practices For all projects, the Bay Area AQMD recommends implementing all Basic Construction Mitigation Measures (listed in the Standard Conditions and Mitigation Measures section, Table 18) to meet the above Best Management Practices threshold for fugitive dust, whether or not construction-related emissions exceed applicable thresholds. (BAAQMD, 2011b, Section 8.1.2.) Operational Criteria Pollutant Emissions. The Bay Area AQMD considers air pollution associated with criteria pollutants to be largely a cumulative impact. As such, the BAAQMD has established emissions thresholds above which it believes a project's individual operational criteria pollutant emissions would be cumulatively considerable, resulting in significant adverse impacts to the Bay Area region's existing air quality conditions. Therefore, it considers the following project-level criteria pollutant thresholds to address both project-level and cumulative impacts. Additional analysis to evaluate cumulative impacts is unnecessary (BAAQMD, 2011b, Section 2). Table 5. Operational Criteria Pollutant Emissions Significance Thresholds. Maximum Annual Average Daily Emissions Pollutant/Precursor Emissions (tons/year) (pounds/day) Proiect-Level and Cumulative Impacts: Reactive Organic Gases (ROG) 10 54 Nitrogen Oxides (NOx) 10 54 Respirable Particulate Matter (PM,o) 15 82 Fine Particulate Matter (PM2.5) 10 54 Carbon Monoxide "Hot Spots". For localized carbon monoxide impacts, the Bay Area AQMD recommends use of the applicable one- and eight-hour California ambient air quality standards. If a proposed project would cause local ambient carbon monoxide concentrations to exceed either of the two standards, the project would be considered to have a significant adverse air quality impact. The Bay Area AQMD also provides a conservative screening methodology to identify proposed projects that would have a less than significant impact on localized carbon monoxide levels ("hot spots"). If a project would increase traffic volumes at affected intersections to not more than 44,000 vehicles per hour, the 7/30/2012