Direct source testing (i.e., the “2010 Source Test”) was conducted from May 7 through September 2, 2010, on the 205 Delayed Coking Unit (205 DCU) Drum 205-1201 Depressurization Vent (1201 Vent) and Drum 205-1202 Depressurization Vent (1202 Vent) at the Marathon Petroleum Company LLC, Louisiana Refining Division. The objective of the 2010 Source Test was to quantify the concentrations and mass emission rates of non-methane/non-ethane volatile organic compounds (NMNE VOC), methane, ethane, benzene, toluene, selected semivolatile organic compounds (SVOC), total particulate matter (PM), and total reduced sulfur (TRS) in the 1201 Vent and 1202 Vent gas streams. The 2010 Source Test was performed during the atmospheric depressurization step of the delayed coking process prior to the removal of petroleum coke from the coke drum. The 205 DCU was operated under a variety of conditions during the 2010 Source Test.

• Source Test Report for the 205 Delayed Coking Unit Drum 205-1201 and Drum 205-1202 Depressurization Vents (PDF)(240 pp, 2 MB, April 8, 2011)