Comment of Sierra Club under CP13-553, et. al.

Chapter 4: Fugitive Emissions CHAPTER 4 FUGITIVE EMISSIONS 2006 IPCC Guidelines for National Greenhouse Gas Inventories 4.1 Chapter 4: Fugitive Emissions Contents 4 Fugitive Emissions 4.1 Fugitive emissions from mining, processing, storage and transportation of coal..................................4.6 4.1.1 Overview and description of sources.............................................................................................4.6 4.1.1.1 Coal mining and handling........................................................................................................4.6 4.1.1.2 Summary of sources .................................................................................................................4.8 4.1.2 Methodological issues ...................................................................................................................4.9 4.1.3 Underground coal mines................................................................................................................4.9 4.1.3.1 Choice of method...................................................................................................................4.10 4.1.3.2 Choice of emission factors for underground mines ...............................................................4.11 4.1.3.3 Choice of activity data ...........................................................................................................4.14 4.1.3.4 Completeness for underground coal mines ............................................................................4.14 4.1.3.5 Developing a consistent time series .......................................................................................4.14 4.1.3.6 Uncertainty assessment..........................................................................................................4.15 4.1.4 Surface coal mining.....................................................................................................................4.17 4.1.4.1 Choice of method...................................................................................................................4.17 4.1.4.2 Emission factors for surface mining ......................................................................................4.18 4.1.4.3 Activity data...........................................................................................................................4.19 4.1.4.4 Completeness for surface mining...........................................................................................4.19 4.1.4.5 Developing a consistent time series .......................................................................................4.19 4.1.4.6 Uncertainty assessment in emissions .....................................................................................4.20 4.1.5 Abandoned underground coal mines ...........................................................................................4.20 4.1.5.1 Choice of method.........................................................