RICHMOND (CBS SF) -- The Chevron Refinery in Richmond was reporting heavy flaring Thursday evening, sending a cloud of heavy black smoke over the bay.
Chevron officials said the flaring that started around 6 p.m., creating visible flames and smoke.
Heavy smoke had risen into the atmosphere in the immediate vicinity but the Contra Costa County Health Department conducted monitoring and it was revealed that there were no detectable levels offsite.
Contra Costa County Health assisted on-site with air monitoring in the Hilltop and El Sobrante areas.
Flaring incidents have been reported at the refinery multiple times over the past year.
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