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29 Since emission factors for CH4 and N2O are highly depen- 3.5.1 Stationary Source Combustion dent on vehicle type, operating conditions, control technol- Activities--Method 1 ogy, etc., IPCC only allows the calculation of these emissions within its Tier 3 method. Although IPCC and other sources Method 1 embraces both IPCC Tier 1 and 2 for emissions such as USEPA provide emission factors for these sources, from stationary source combustion. Both of these IPCC tiered there are no average values; they are provided for the specific methods involve the use of fuel consumption data associated categories. It is up to the inventory developer to properly (and with these sources, coupled with emission factors to calculate reasonably) employ these specific emission factors. IPCC data GHG emissions. IPCC differentiates between these two tiers for these pollutants can be found in Volume 2, Chapter 3, by distinguishing between the use of default IPCC emission Tables 3.2.2 to 3.2.5 of the 2006 guidelines (IPCC 2006). The factors in its Tier 1 method and use of country-specific data in USEPA data can be found in Annex 3 Tables A-88 to 89 of the its Tier 2 method. As such, data specific to the United States 2008 national GHG inventory report (USEPAb 2008). are preferred under Method 1 described herein. Method 1 involves the use of average emission factors as indicated in Figure 3-10. 3.4.4 Other Pollutants The stationary source fuel consumption data can be obtained For HFC and PFC, IPCC provides methods to derive emis- from various fuel purchase or financial records and should be sions for these pollutants based on default parameters related separated by sources owned by the airport operator versus to mobile air conditioning. The IPCC methods can be found those owned by tenants. For locations where purchased natu- in Volume 3, Chapter 7 of the IPCC guidelines (IPCC 2006). ral gas or electrical records are not absolutely clear as to the Both the USEPA Climate Leaders (USEPAc 2008) and TCR quantities that are the responsibility of the airport operator (TCRa 2008) provide simplified explanations and emission versus that of the tenants, the following guidance is provided: factors based on the same information from IPCC. (1.) any purchased electricity or natural gas invoices received The overall method is based on material balancing of the by the airport operator, even if directly metered to a tenant, emissions taking into account the charging, operating, and dis- are the responsibility of the airport operator and thus their posal of refrigerants. The USEPA Climate Leader's simplified emissions should be categorized under the airport-owned view of the emission factors and related parameters is pre- category; and (2.) if invoices are received by the tenant and sented in Table 2 of their Refrigeration and Air Conditioning the airport can either gain access to them or an estimate can emissions guidance document (USEPAc 2008). The inventory be made of the tenant electricity/energy usage, the associ- developer will need to determine if this method is warranted ated emissions should be categorized under the "tenant" and the corresponding data are appropriate for the airport. category. In any case, these emissions should all be included For the other pollutants in Level 3 (beyond the six Kyoto as part of an airport GHG inventory. Airport-owned elec- pollutants), USEPA's MOBILE6.2 (USEPA 2002) or similar tricity purchases should be classified as Scope 2 emissions CARB's EMFAC2007 (CARBb 2007) can be used to predict whereas tenant-owned electricity purchases should be char- emission factors for GAV. The pollutants include various gases acterized as Scope 3 emissions. and PM. Emissions of other pollutants (H2O and SOx) based on fuel composition potentially can be estimated using fuel com- position data with mass balance as indicated in Appendix C. Stationary Source Average Emission Fuel Consumption Factors and Other 3.5 Stationary Sources Data Data as Necessary With the broad range of sources covered under this cate- gory, the methods to calculate GHG emissions from stationary sources have been grouped into the following categories: Calculate Stationary source combustion activities, Method 1: Use average emission factors, Method 2: Use technology-specific emission factors, Stationary Source Electricity usage. GHG Emissions This section includes subsections devoted to CO2 emissions Figure 3-10. Overview of from the above categories. The final subsection addresses the Stationary Source Combustion remaining GHGs. Method 1.