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Valero (26003), Norco

LDEQ Accident Report

Accident #120145
State Police #094084
Accident Date2009-12-15
Report Date 2009-12-22
Follow-up Date 2010-02-05
Follow-up: Yes

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Sulfur Dioxide7 hours 42 minutes3700 TOX (EQT 0195)NOYESNO1,049.9 pounds

Accident Classified As:

Cause of Problem: Instrument Failure

Due to the malfunction of a float switch, the 3700 Sulfur Recovery Unit (3700 SRU) tripped offline at approximately 03:59 on 12/15/09. As a result the SO2 levels at the 3700 Thermal Oxidizer (3700 TOX or EQT 0195)were elevated from approximately 04:03 am to 11:44 am.

Discharge Preventable - No Information Given

Initial report lists cause as "under investigation". Follow-up report lists emissions as below reportable quantity so no further information is given.

Notes/Remedial Actions

The 3700 SRU feed stream was redistributed and the unit was restarted.