Data reflecting operation of Burlington Resources assets in the U.S., Canada, China, U.K and Algeria are included for 9 months of 2006, as these assets were acquired March 31, 2006.
Data reflecting operation of the Wilhelmshaven Refinery in Germany are included for 5 months of 2010, as this asset was closed in May 2010.
All reported HSE data are based on operated assets only. Environmental data are represented as 100 percent ownership interest regardless of actual share owned by ConocoPhillips. Data is reported in metric tons (referred to as tonnes).
The total emissions are normalized using barrels of oil equivalent (BOE) as a factor of production operations. For gas production and liquefied natural gas, 6,000 cubic feet of gas is assumed to be equal to one BOE. For gas processing plants, the BOE normalizer includes only liquid production of ethane, propane, butane and condensate.
Previously reported data for prior years has been updated as needed to reflect the most current and accurate data available.
Environmental Data Quality and Assurance
Guidelines, calculation tools and training are provided to ConocoPhillips’ business units for calculating and reporting environmental incidents, releases and emissions. The businesses are accountable for reported data completeness and accuracy and for consistency with accepted reporting practices. A business level data submission, review and approval process is implemented to provide accountability for the results and to ensure the best possible data quality.
Ernst & Young reviewed the data processes used for gathering the previous HSE data related to greenhouse gas data (including guidelines, calculation tools, database systems, training materials and quality assurance processes employed) and safety statistics. After completing this review they provided a statement of their findings.
In addition, the corporate health, safety and environment (HSE) function verifies and validates the reported data. Internal reviews of 2006, 2008 and 2010 metrics and data collection processes employed have been performed by the company’s corporate HSE auditors.
Greenhouse Gas Data Scope
All reported HSE data are based on operated assets only. Environmental data are represented as 100 percent ownership interest regardless of actual share owned by ConocoPhillips. The company intends to also report equity Greenhouse Gas emissions in the future, and is establishing a process for the collation of GHG data from non-operated joint ventures in which it has a 20 percent or greater equity interest, or from joint ventures in which ConocoPhillips equity share of GHGs equal or exceed 50,000 tonnes on a CO2 equivalent basis, regardless of equity ownership percentage
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Emissions Calculations
The approaches used by the company’s businesses in reporting emissions data for greenhouse gases and other compounds are selected from combinations of the following principles that are listed in order of accuracy. Businesses are assisted in moving to more accurate methodologies, which may result in variances due to improved data quality from year to year.
- Undertake continuous emission monitoring, and with measured exhaust gas flow, compute instantaneous mass emission rate and integrate over the reporting period.
- Undertake periodic monitoring of exhaust gas flow and composition and estimate mass emission over the reporting period using plant operating records.
- Estimate emissions using a mass balance and process flow knowledge.
- Estimate emissions using emission factors provided by the manufacturer’s specification, local regulatory authority, AP-42, API Compendium or other industry standard.