Three of the violations were for visible emissions and one was for a public nuisance violation, an air district spokesperson said Wednesday morning.
The district was notified about the flaring at 3:42 p.m. Monday. People across the Bay Area reported heavy smoke and flames coming from at least three smokestacks.
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Chevron said a partial power failure caused the flaring, which is typically the burning of excess gases.
The heavy smoke triggered a Community Warning System Level 1 warning issued by Contra Costa County. The warning didn't require any action and no one was evacuated. The air district said Chevron reported the flaring stopped at 2:03 a.m. Tuesday.
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An air district spokesperson said the investigation is ongoing and more violations may be issued.
More information on the case can be found here.
To view real-time air quality data, click here.