1. Oil and Gas Sector E&P Reporting Protocol For Western Regional Air Partnership May 4, 2009 Presented by: Science Applications International Corporation and Environ International Corporation

2. 2 Task 2: Summary of Comments  We Would Like to Thank Everyone for Their Comments Nearly 200 comments received (states, producers, enviros, others) in very short turnaround Comments demonstrate importance of GHG emissions Comments very helpful in nature Opportunity to discuss comments and concerns as well as path moving forward later in the agenda  Types of Comments Received Insufficient data concerns Relative source rankings Geographic domain used for rankings Sources not included Comments related to methodology and measurement methods Other comments (technical, editorial, organizational, data sources)

3. 3 Task 2: Summary of Comments  Examples of Comments Related to Insufficient Data Concerns Offshore analysis used only 2 of 27 platforms which may not be representative Several data gaps exist for equipment types and activity data for several production basins Variability exists across and within basins making it possible to only identify top 3 to 4 sources  Examples of Comments Related to Relative Source Rankings Relative rankings of some sources such as completion venting, well blow-down and pneumatics do not appear correct Different approaches were taken, some by basin and production characteristics, others by conventional oil and conventional gas data or production type Since emission sources represent an average or blended contribution to GHG, this might skew the data

4. 4 Task 2: Summary of Comments  Examples of Comments Related to Geographic Domain For GHG emissions, it is not the basin that drives emissions but rather operations design and deployment GHG emissions might have broad similarities based on resource physical properties, its quality, the age of the operating equipment, and local requirements, rather than the mere geographical location. Production types, reservoir properties, maturity and depths vary widely within a basin, therefore a subdivision of basins is needed  Examples of Comments Related to Sources Not Included Oil and gas well truck loading (and mobile sources in general) Casing gas venting and casing gas migration emissions Cogeneration units (particularly for California) Enhanced oil recovery (particularly for California) Indirect emissions from generation of heat and steam Vented emissions from drilling rigs

5. 5 Task 2: Summary of Comments  Examples of Comments Related to Methodology and Measurement Methods Several technical comments related to specific methodologies More detail requested on specific methodologies and data sources for each basin Several questions and comments related to turbines, well completions, well venting, pneumatic devices and pumps, flares and fugitives  Several Other comments Technical comments (very helpful) Clarifying questions and comments Organizational and/or editorial comments Documentation on assumptions