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Marathon Ashland Petroleum (3165), Garyville
LDEQ Accident Report
| Accident # | 159790 |
| State Police # | 14-04897 |
| Accident Date | 2014-10-31 |
| Report Date | 2014-11-07 |
| Follow-up Date | 0000-00-00 |
| Follow-up: | No |
Pollutants Released
| Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
| Hydrogen Sulfide | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | NO | 620.0 pounds |
| Hydrogen | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | NO | 2.0 pounds |
| Carbon Dioxide | 2h 30m | Sour Water Tanks in Units 33 and 233 | YES | NO | NO | 65.0 pounds |
| Ethylene | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | YES | 59.0 pounds |
| Ethane | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | YES | 73.0 pounds |
| Methane | 2h 30m | Sour Water Tanks in Units 33 and 233 | YES | NO | YES | 45.0 pounds |
| Propane | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | YES | 81.0 pounds |
| Propylene | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | YES | 220.0 pounds |
| Isobutane | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | YES | 122.0 pounds |
| n-Butane | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | NO | 72.0 pounds |
| 1-Butene | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | YES | 51.0 pounds |
| trans-2-Butene | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | NO | 49.0 pounds |
| cis-2-Butene | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | NO | 35.0 pounds |
| Isopentane | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | YES | 30.0 pounds |
| Pentane | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | YES | 40.0 pounds |
| Cyclopentene | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | YES | 159.0 pounds |
| Butene | 2h 30m | Sour Water Tanks in Units 33 and 233 | NO | NO | YES | 52.0 pounds |
Accident Classified As: Reportable Quantity
Cause of Problem: Under Investigation
The incident took place when fixed and personal H2S monitors were alarming in the area of the Sour Water Tank in Units 33 and 233. After some time, it was determined that the non-degassed Sour Water was allowed to bypass the surge drum due to high pressure, which routed this material directly to the Sour Water Storage Tanks. This resulted in a vapor release from the Sour Waste Tanks, A root cause analysis is being conducted to determine why the incident occurred. The refinery's fence line Ambient Air Monitors did not pick up any excess emissions at the time of the incident. The incident released approximately 620 pounds of Hydrogen Sulfide.
Discharge Preventable - Under Investigation
Not known at this time, the results of the Root Cause Analysis will determine whether or not this was preventable.
Notes/Remedial Actions
Air monitoring was conducted in the area around the tank. A perimeter was established around the affected area. The flow of sour water to the Sour Water Tanks was decreased ending the vapor release from the tanks. The root cause analysis will result in recommendations designed to prevent the recurrence of this event.
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