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ProK 7.A. - Page 195 Redwood City GDF Expansion Air Gtuau�yi�.urna�e�.nanye r�nalysis Appendix C: Modeling Assessment Updates Table C-1. Update to Assessment of Ambient Short-Term Criteria Pollutant Exposure Due to Vehicle Queuing Air Pollutant Ex osure Due to Vehicle Idlin Table from 2007 Certified EIR Table 4.5-8 . Standard 2007 EIR Modeled Predicted Evaluated in Queuing Employee Percent Resident Percent Averaging 2007 EIR Emissions Exposure of Exposure of Pollutant Period /m3) Ib/da (�ag/m3) Standard (�ag/m3) Standard Carbon Monoxide 1 hour 23,000 4.6 113.4 0.49% 48.5 0.21% 8 hour 10,000 4.6 79.4 0.79% 34.0 0.34% Nitrogen Dioxide 1 hour 470 0.5 1.23 0.26% 0.53 0.11% Respirable Particulate 24-hour 50 0.04 0.35 0.70% 0.15 0.30% Matter(PM�o) Notes: 1. Source: 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. U date to Air Pollutant Ex osure Due to Vehicle Idlin Table from 2007 Certified EIR to Reflect Current Standards. Current 2007 EIR Modeled Modeled Applicable Queuing Employee Percent Resident Percent Averaging Standard Emissions Exposure of Exposure of Pollutant Period (�ag/m3) Ib/da (�ag/m3) Standard (�ag/m3) Standard Carbon Monoxide 1 hour 23,000 4.6 113.4 0.49% 48.5 0.21% 8 hour 10,000 4.6 79.4 0.79% 34.0 0.34% Nitrogen Dioxide 1 hour 188 0.5 1.23 0.65% 0.53 0.28% Respirable Particulate 24-hour 50 0.04 0.35 0.70% 0.15 0.30% Matter(PM�o) Notes: 1. The above table reflects updates to data presented in 2007 Certified EIR Table 4.5-8 to incorporate the current federal one-hour nitrogen dioxide standard. 2. 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/rrl)effective on March 20,2008. Comparison of Queuing Emissions Estimates for Proposed GDF Expansion to 2007 Certified EIR GDF. Queuing Emissions Queuing Emissions Comparison of Proposed Reflected in 2007 Certified Estimated for Proposed GDF Expansion to EIR(16 Positions) Expansion(20 Positions) 2007 Certified EIR GDF Pollutant ounds/da ounds/da ercent Carbon Monoxide 4.6 3.2 70% Nitrogen Dioxide 0.5 0.29 58% Respirable Particulate 0.04 0.01 25% Matter(PM�o) Notes: 1. Queuing emissions estimated for proposed expansion(20 positions)is based on information presented in Table B-3. 2. The queuing emissions comparison reflects vehicle queuing emissions estimated for proposed expansion (20 positions)divided by vehicle queuing emissions reflected in the 2007 Certified EIR(16 positions). Com arison of Emission Factors Used in 2007 Certified EIR Queuin Anal sis to Current Emission Factors. 2007 Certified EIR Current Analysis % Decline[(EMFAC2011 Pollutant (EMFAC2002-grams/mile) (EMFAC2011 -grams/mile) =EMFAC2002)- 1] Carbon Monoxide 9.2652 5.3800 -42% Nitrogen Dioxide 1.0046 0.4785 -52% Respirable Particulate 0.0712 0.0167 -77% Matter(PM�o) Notes: 1. Source for 2007 Certified EIR EMFAC2002 queuing factors: Hans Giroux and Associates,Redwood City Costco Gas Station Vehicle Queuing Impacts (memorandum from Hans Giroux to Amy Gramlich), May 22,2006. 2. Source for Current EMFAC2011 queuing factors: Table B-3,assuming 453.59 grams/pound. Page 1 Date: 7/30/2012