Aspen-Pitkin County Airport Greenhouse Gas Emissions Inventory ...

II.INVENTORY PROTOCOLThis chapter documents the methodologies used to prepare the 2006 greenhouse gas emissionsinventory for Aspen-Pitkin County Airport. This chapter discusses:• Pitkin County Airport organization and operational boundaries• Methods to quantify airport-related sources• Uncertainties and Data CautionsThe principles by which this inventory was prepared reflect general factors considered in mostgreenhouse gas inventories:• Relevance means that the inventory includes the appropriate facilities and types ofemissions sources to meet the entity’s goals.• Completeness means that an adequate percentage of the entity’s (ie, Pitkin CountyAirport Section) total facilities and emissions sources have been included in theinventory.• Accuracy means using accepted quantification methods and emissions factors as well asmanaging data quality.• Transparency means that the important boundary decisions, data sources, andquantification methods are well documented.• Consistency means that the same facilities, emissions sources, and emissionsquantification methods are used from year to year. As noted earlier, it is anticipated thatthe approach to considering airport-related emissions will evolve with time. Thisinventory then is prepared in a transparent way to enable the emissions presented hereinto be re-tabulated if needed.II.1PITKIN COUNTY AIRPORT ORGANIZATION AND OPERATIONALBOUNDARIESWhile a standard greenhouse gas inventory protocol has not been developed for the airportsetting, protocols have evolved from a number of sources that can be used in whole or partincluding:• Intergovernmental Panel on Climate Change (IPCC) - focused on inventories fornations, but provide guidance for other parties on various sources, including aviation;• US EPA - has prepared guidance for states to prepare inventories, but has also prepared aprotocol through the Climate Leaders effort to assist other entities, particular corporationswith consistent greenhouse gas inventories;• World Resource Institute (WRI) an environmental think tank, in collaboration with theWorld Business Council for Sustainable Development, has developed comprehensiveguidance to assist corporations prepare emission inventories, both representing thecorporate entity as well as corporate projects.- II-1 - 4/3/2008