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Proposed Costco Wholesale Redwood City GDF Expansion 7.B. - Page 149 Air Quality/Climate Change Analysis Page 4 than significant. All other air quality impacts were determined to be less than significant. The certified EIR did not evaluate impacts associated with emissions of greenhouse gases on global climate change. On April 30, 2008, the Bay Area Air Quality Management District (Bay Area AQMD or BAAQMD) issued an Authority to Construct for Costco's gasoline dispensing facility, limited to a throughput of 29.8 million gallons per year (BAAQMD, 2008b).3 Based on a health risk screening analysis conducted as part of the permit evaluation (BAAQMD, 2008b), the District determined that the facility complied with its acceptable risk thresholds specified in District Rule 2-5-302. Construction of the facility was completed in September 2009. Evaluation of Proposed Project Costco Wholesale now proposes to expand its existing three-island, 12-position Redwood City GDF to five islands and 20 fueling positions. Maximum facility gasoline throughput will not exceed 18 million gallons per year (double the throughput assumed in the 2007 Certified EIR), even though the facility is allowed a throughput of 29.8 million gallons per year under its Bay Area AQMD Permit to Operate. Ashworth Leininger Group (ALG) was retained to update the 2007 Certified EIR air quality analysis as necessary to satisfy the impact assessment, mitigation, and disclosure requirements of the California Quality Environmental Quality Act (CEQA) for the current proposal. ALG has updated the air quality analysis to address the following issues: • Environmental Settinq. Update the Environmental Setting section, as necessary, to reflect updated information related to ambient standards, air quality regulations, ambient air quality, and global climate change. • Thresholds of Siqnificance. Update the Thresholds of Significance section to reflect the thresholds reflected in the Bay Area AQMD CEQA Guidelines (BAAQMD, 2011 b). • Environmentallmpacts. o Demolition/Construction. Evaluate construction impacts associated with the proposed GDF expansion. o Operational Criteria Pollutant Emissions. Evaluate the impacts of vehicle trips, vehicle queuing, and gasoline dispensing associated with operation of the proposed GDF expansion. o Carbon Monoxide "Hot Spots". Evaluate the need to update the 2007 Certified EIR analysis for the proposed GDF expansion. o Queuinq Impacts on Ambient Air Qualitv. Update the 2007 Certified EIR analysis as necessary to reflect updated air quality standards and the proposed GDF expansion. 3 The 29.8 million gallon annual throughput limit is expressed as a limit on gasoline dispensed in any consecutive 12- month period, and is the maximum amount of gasoline that could be dispensed without triggering the emission offset requirements of Bay Area AQMD Rule 2-2-302. 7/30/2012