One hearing will be held in Arlington, Virginia on April 19, 2010. It will cover the proposed rule "Mandatory Reporting of Greenhouse Gases: Petroleum and Natural Gas Systems"and the proposed rule "mandatory Reporting of Greenhouse Gases: Injection and Geologic Sequestration of Carbon Dioxide."he other hearing will be held in Washington, DC, on April 20, 2010. It will cover the proposed rule "Mandatory Reporting of Greenhouse Gases: Additional Sources of Fluorinated GHGs."