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Proposed Costco Wholesale Redwood City GDF Expansion 7.A. - Page 176 <br /> Air Quality/Climate Change Analysis <br /> Appendix A: Construction Emission Calculations <br /> Table A-5. San Mateo County EMFAC2011 On-road Vehicle Emission Factors for 2012. <br /> Construction Worker Vehicles <br /> Haul/Concrete Trucks Light Duty Autos(LDA), Light Duty Trucks(LDT), <br /> Heavy-heavy Duty Trucks(T7) and Medium Duty Vehicles(MDV) <br /> Parameter Units (Diesel) (Gasoline and Diesel) <br /> Criteria Pollutants <br /> ROG Ib/mile 0.00135173 0.00064585 <br /> CO Ib/mile 0.00588280 0.00658642 <br /> NOx Ib/mile 0.02537286 0.00062477 <br /> PM�o Ib/mile 0.00103811 0.00010628 <br /> PM2.5 Ib/mile 0.00083769 0.00004605 <br /> SOx Ib/mile 0.00003820 0.00000951 <br /> Greenhouse Gases <br /> COZ Ib/mile 4.00447997 0.94113606 <br /> CH4 Ib/mile 0.00010210 0.00008624 <br /> N20 Ib/mile 0.00013190 0.00006609 <br /> Trip Distance mi/trip 20.0 12.4 <br /> Notes: <br /> 1. Criteria pollutant and COZ emission factors for on-road motor vehicles are derived from California Air Resources Board's <br /> EMFAC2011 model emission estimates for San Mateo County for 2012(daily summer emissions). Source: California Air <br /> Resources Board,EMFAC2011 Web Based Data Access,October 24,2011,emissions data option,available at <br /> www.arb.ca.gov/msei/modeling.htm(accessed January 20,2012). Emissions(in tons per day)for San Mateo County were <br /> converted to pounds per mile using EMFAC2011 daily VMT(vehicle miles traveled)estimate. For haul/concrete trucks, <br /> emissions were estimated using EMFAC2007 vehicle categories(combining all heavy-heavy duty trucks in the T7 category). <br /> For construction worker vehicles,emissions were estimated for the light duty auto(LDA),light duty truck(LDT1 and LDT2), <br /> and medium duty vehicle(MDV)categories,summed,and converted to pounds per mile using the sum of EMFAC2011 daily <br /> VMT estimates. <br /> 2. Methane(CH4)and nitrous oxide (N20)emissions were calculated based on emission factors developed for the California <br /> Air Resources Board 2000-2009 Greenhouse Gas Emissions Inventory. Source: California Air Resources Board, <br /> Documentation of California's Greenhouse Gas Inventory-3rd Edition, May 24,2012,data for 2009, Category 1A3b-Road <br /> Transportation,available at www.arb.ca.gov/cc/inventory/doc/doc_index.php(accessed May 24,2012). Factors for <br /> Light Duty Trucks and Sports Utility Vehicles were used for Medium Duty Vehicles(MDVs). <br /> a. Heavy-duty trucks and buses(Category 1A3biii-distillate): <br /> 0.257 grams methane/gallon of diesel <br /> 0.332 grams nitrous oxide/gallon of diesel <br /> b. Light duty autos(Category 1A3bi-gasoline): <br /> 0.793 grams methane/gallon of gasoline <br /> 0.598 grams nitrous oxide/gallon of gasoline <br /> c. Light duty trucks and Sports Utility Vehicles(Category 1A3bii-gasoline): <br /> 0.748 grams methane/gallon of gasoline <br /> 0.584 grams nitrous oxide/gallon of gasoline <br /> Note that gasoline methane and nitrous oxide emission factors are used for construction worker vehicles since 99.8%of <br /> vehicle fuel use is gasoline,and only 0.2%is diesel. <br /> 3. Criteria pollutant emission factors include total emissions for each pollutant. In addition to exhaust emissions, ROG factors <br /> include diurnal,hot soak, running loss,and resting loss emissions. In addition to exhaust emissions, PM�o and PM2.5 factors <br /> include emissions from brake wear and tire wear. <br /> 4. Construction worker trip length and haul/concrete truck trip length are based on CaIEEMod emissions model default values. <br /> Source: ENVIRON International Corporation, California Emissions EstimatorModel(CaIEEMod) User's Guide Version <br /> 2011.1, February 2011,available at www.caleemod.com(accessed January 6,2012). <br /> 5. Conversion factors: <br /> 2000 pounds/ton <br /> 453.59 grams/pound <br /> Page 8 Date: 7/30/2012 <br />