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|State Police #||11-08042|
|Pollutant||Duration||Point Source||Greenhouse Gas||Criteria Pollutant||Ozone forming chemical||Amount of Release|
|Nitrogen Oxide||20 m||205 Coker Unit to Unit 259 North Ground Flare||NO||YES||YES||6.4 pounds|
|Particulate Matter 10||20 m||205 Coker Unit to Unit 259 North Ground Flare||NO||YES||NO||0.6 pounds|
|Carbon Monoxide||20 m||205 Coker Unit to Unit 259 North Ground Flare||NO||YES||NO||6.8 pounds|
|Sulfur Dioxide||20 m||205 Coker Unit to Unit 259 North Ground Flare||NO||YES||NO||591.0 pounds|
|Hydrocarbon||20 m||205 Coker Unit to Unit 259 North Ground Flare||NO||NO||YES||55.7 pounds|
|Highly Reactive Volatile Organic Compounds (HRVOCs)||20 m||205 Coker Unit to Unit 259 North Ground Flare||NO||NO||NO||1.3 pounds|
|Volatile Organic Compounds (VOCs)||20 m||205 Coker Unit to Unit 259 North Ground Flare||NO||NO||YES||8.5 pounds|
Accident Classified As: Reportable Quantity
The incident occurred when the facility was switching from the online drum to the blowdown drum. During the switch, the Wet Gas Compressor surge controller attempted to open the second stage spillback valve. The valve hesitated to open, causing a spillback to trip open. This caused the frac and blowdown to pressure up and the compressor to send the product to the flare until the operations pressure returned to normal. At the time of the written notification, the incident was still being investigated to determine the cause of the overpressure condition.
Marathon is further investigating the incident, but at the time of the written notification, the incident did not appear to have been preventable. An incident investigation was ongoing at the time of the written notification in order to determine specific remedial action necessary to prevent recurrence.
The unit pressure levels were automatically corrected by the wet gas compressor surge control system.