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|Ozone forming chemical
|Amount of Release
Accident Classified As: Below Reportable Quantity (BRQ)
On March 12, 2012, Motiva Convent Refinery reported an offsite discharge event due to a wastewater treatment bypass where during heavy rains approximately 60 gallons of wastewater overflowed a containment slab and flowed through the facility fenceline to a ditch that (while still on Motiva property) did not discharge through a monitored Outfall. The incident began at 08:05 AM and ended at 11:55 AM on March 12, 2012. The incident was caused when a surface drain could not keep up with the unusually high rainfall rate. A follow-up investigation revealed that the perimeter ditch outside of this fenceline redirects all possible fenceline discharges back into the facility via subsurface drainage for discharge through monitored Outfall 002 (stormwater). The source of the wastewater bypass consisted of contact stormwater from a waste container storage slab, which is normally routed to wastewater treatment for discharge through Outfall 001 (process wastewater), but instead entered the monitored Outfall 002 (stormwater) drainage system.
The release was halted when the rainfall slowed and the area pump could maintain drainage from the slab. Wastewater which exited the site could not be recovered.