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Shell Chemical East (26336), Norco

Releases of Polycyclic Aromatic Hydrocarbons

LDEQ Accident Number
Accident Date
Point Source(s) Notes Amount of Release

GO-1 Elevated Flare (EPN 1-90)
Cause: Flaring from the GO-1 Elevated Flare (EPN 1-90) was a result of an unexpected shutdown of the propylene refrigerant compressor.

Followup: No

Notes: GO-1 operations took the necessary steps to minimize flaring and safely return the unit to normal operating conditions and the flaring stopped. Investigation and data gathering confirm that no RQ or maximum permitted limits were exceeded.

OL-5 Exchange Unit E1970
WWTP system
Cause: On June 1, a release of Benzene, Naphthalene, Polycyclic Aromatic Hydrocarbons, and Volatile Organic Compounds occurred. The release was due to an unexpected leak on an OL-5 process unit 20lb Steam Regenerator Exchanger. The Norco Site Supervisor was notified by a st. Charles DEP deputy of an odor detected along highway 61. The leaking steam condensate entrained with CLGO (cracked light gas oil) hydrocarbon entered the storm water drain and the refinery conveyance system.

Followup: Yes

Notes: At the time of the LDEQ verbal notification, in house monitoring levels of Benzene were 5.0 ppm. The material was removed from the storm water drains and conveyance systems and disposed of properly. Mr. White stated the product was being routed to an oily/water separator, thence to their WWTP system for treatment. They were "slabbing" the condensate as of approximately 1415 hours. Gas oil release is now ongoing and is going to effluent system and being picked up at their separator. The material was reported to have gone offsite - released to the air. Inside the facility air monitoring was between 6-10 ppm. There was no offsite protective action. The 24 hour update states the exchanger 1970 was taken off line which is what was leaking. Have contractors picking up the oil out of the F1 system.

OL-5 Unit
Cause: The Shell Chemical OL-5 Unit has two pyrofrac bottoms filters. A leak in two-inch piping adjacent to one of the two pyrofrac bottoms filter caused a spill of materials. The second filter was out of service for maintenance at the time of the leak.

Followup: Yes

Notes: Operations immediately completed maintenance on the out-of-service filter and returned it back to service in order to shutdown the pyrofrac bottoms filter that was adjacent to the leak. The leak stopped once this filter was taken out of service.