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Proposed Costco Wholesale Redwood City GDF Expansion 7.A. - Page 196 Air Quality/Climate Change Analysis Appendix C: Modeling Assessment Updates Table C-1a. Ambient Short-Term Criteria Pollutant Exposure Due to Vehicle Queuing-Supplemental Data. Update to 2007 Certified EIR Modeled Criteria Pollutant Vehicle Idling Exposure to Reflect Proposed Project-Employee Exposure. Current 2007 Certified EIR Analysis Proposed Extreme Max Maximum Applicable Queuing Modeled Project Assumption Percent Averaging Standard Emissions Exposure Queuing Queuing of Pollutant Period (�ag/m3) (Ib/day) (�ag/m3) (�ag/m3) (�ag/m3) Standard Carbon Monoxide 1 hour 23,000 4.6 113.4 79.8 421.1 1.83% 8 hour 10,000 4.6 79.4 55.9 294.8 2.95% Nitrogen Dioxide 1 hour 188 0.5 1.23 0.71 3.74 1.99% Respirable Particulate 24-hour 50 0.04 0.35 0.09 0.46 0.93% Matter(PM�o) U date to 2007 Certified EIR Modeled Criteria Pollutant Vehicle Idlin Ex osure to Reflect Pro osed Pro�ect-Residential Ex osure. Current 2007 Certified EIR Analysis Proposed Extreme Max Maximum Applicable Queuing Modeled Project Assumption Percent Averaging Standard Emissions Exposure Queuing Queuing of Pollutant Period (�ag/m3) (Ib/day) (�ag/m3) (�ag/m3) (�ag/m3) Standard Carbon Monoxide 1 hour 23,000 4.6 48.5 34.1 180.1 0.78% 8 hour 10,000 4.6 34.0 23.9 126.2 1.26% Nitrogen Dioxide 1 hour 188 0.5 0.53 0.31 1.61 0.86% Respirable Particulate 24-hour 50 0.04 0.15 0.04 0.20 0.40% Matter(PM�o) Vehicle Queuin Emissions Estimates. Queuing Emissions Queuing Emissions Queuing Emissions Reflected in 2007 Certified Estimated for Proposed Estimated for Extreme EIR(16 Positions) Expansion(20 Positions) Maximum Assumption Pollutant ounds/da ounds/da ounds/da Carbon Monoxide 4.6 3.24 17.08 Nitrogen Dioxide 0.5 0.29 1.52 Respirable Particulate 0.04 0.01 0.05 Matter(PM�o) N otes: 1. Source for 2007 Certified EIR modeled employee exposures and modeled residential exposures: City of Redwood City, Draft Environmental Impact Report for the Redwood City Costco Wholesale Project(SCH#2005092047),Volume I, Section 4.5(Air Quality),Table 4.5-8. 2. Source for 2007 Certified EIR queuing emissions: Hans Giroux and Associates,Redwood City Costco Gas Station Vehicle Queuing Impacts (memorandum from Hans Giroux to Amy Gramlich), May 22,2006. 3. On February 9,2010,the U.S. Environmental Protection Agency enacted a new federal one-hour nitrogen dioxide standard of 100 parts per billion (188 �ag/m3). The new federal standard became effective on April 12,2010,and is lower than the California one-hour nitrogen dioxide standard of 0.18 parts per million(339�ag/rrt�)effective on March 20,2008. 4. 2007 Certified EIR modeled short-term employee and residential exposures to vehicle idling are adjusted above to reflect vehicle queuing associated with the proposed project(including extreme maximum assumption)by scaling based on the ratio of proposed project queuing emissions to 2007 Certified EIR queuing emissions for each identified pollutant. 5. Queuing emissions estimated for proposed expansion and extreme maximum assumption are based on information presented in Table B-3. Note that the extreme maximum assumption that existing facility vehicle trips will double is extremely unlikely. This is because for this to occur,the proposed facility's weekday averape hourly vehicle trips would need to be 75%higher than the existing facility's weekday peak hour vehicle trips. Page 2 Date: 7/30/2012