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25 for use, to provide an explanation of how the APU emis- The following are some examples of fuel-based CO2 emis- sions were handled. In the future, the FAA has indicated sion factors: that they will include APU data within AEDT/EDMS to allow modeling of GHG emissions. Motor/auto gasoline = 19.564 lbs CO2/gal fuel (EIA 2008) or 8.81 kg CO2/gal fuel (USEPAa 2005), Diesel = 22.384 lbs CO2/gal fuel (EIA 2008) or 10.15 kg 3.3 Ground Support Equipment CO2/gal fuel (USEPAa 2005), Unlike criteria pollutant emissions, AEDT/EDMS (FAAa Liquefied petroleum gas (LPG) = 12.805 CO2/gal fuel (EIA 2007) currently cannot be used to calculate GHG emissions 2008) or 5.79 kg CO2/gal fuel (USEPAa 2005), and from GSE because emission factors for those pollutants are Liquefied natural gas (LNG) = 4.46 kg CO2/gal fuel currently not covered by this model. Therefore, a mixture of (USEPAa 2005). AEDT/EDMS and other methods would need to be employed. For CO2 calculations, the following two methods are suggested: A sample calculation, assuming 150,000 gal of motor/auto gasoline was used by GSE, is as follows: Method 1: Use fuel consumption data for GSE equipment to calculate emissions. CO2 emissions = (150, 000 gal fuel ) (19.564 lbs CO2 gal fuel ) Method 2: Use models such as NONROAD to determine = 2, 934, 600 lbs CO2 . emission factors. When converted to metric tons, this equates to 1,331 metric Sections 3.3.1 and 3.3.2 discuss the calculation of CO2. Sec- tons CO2 (2,934,600 lbs 0.00045359237 metric tons/lb). tion 3.3.3 discusses the methodology for Level 2 and Level 3 pollutants. 3.3.2 GSE Method 2 At some airports, fuel use is not available, but the time that 3.3.1 GSE Method 1 specific equipment is used is available or can be estimated. In these cases, USEPA's NONROAD2005 (or similar models If fuel-use information (e.g., fuel sales) for equipment is such as CARB's OFFROAD2007, which should only be ap- available, that information could be used with suitable emission plied to airports in California) could be used to determine factors to calculate GHG emissions as shown in Figure 3-5. emission factors for representative equipment, as shown in For these vehicles, the airport operator would need to have Figure 3-6. records concerning the gallons of fuel that were dispensed to For those airports that have information concerning the its vehicles, and similar records would be required for all ten- use of each piece of GSE, the data would indicate category of ant GSE. It is likely that most airports retain records concern- ing the fuel dispensed to their own vehicles. Fewer airports are expected to have access to the quantities of fuel consumed or dispensed by their tenants to their tenants' vehicles. NONROAD2005 Airport, Airline, or or Other Models EDMS Data GSE Fuel Emission Factors Consumption and Other Data as GSE Activity Emission Data Necessary and Other Data Factors as Necessary Calculate Calculate GSE GHG GSE GHG Emissions Emissions Figure 3-5. Overview of GSE Figure 3-6. Overview of GSE Method 1. Method 2.