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Valero (26003), Norco

Releases of Hazardous Waste

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

West Plant Sump
Cause: On 3/29/11, Valero discovered that the west plant sump was overflowing. Upon identification of the incident, the on-duty shift superintendent implemented the necessary mitigating procedures. The spilled material overflowed the battery limits of the delayed coking unit during a heavy rain storm accompanied by local flooding. The stormwater runoff carried the spilled material over the refinery's perimeter berms and into the Prospect Road and 8 gallons were captures onsite before it could escape.

Followup: Yes

Notes: NO LDEQ report. Three refinery letters. No SPOC Report. Valero completed an incident investigation for this incident and identified several corrective actions to be implemented in order to prevent recurrence of this event. These include rerouting piping to alleviate hydraulic loading of this sump, evaluating additional oil-water separation projects, and evaluating additional waste water surge capacity. Valero estimates that about 11 gallons of material was spilled. Of the 11 gallons released to the ground, approximately 3 gallons escaped to the ditch along Prospect Road where it was collected by vacuum trucks. Recovered oil was sent to the refinery rerun system for subsequent processing. Absorbent booms used in the spill response will be sent offsite for disposal.
11.0 gallons