Updated:May 03 2017 08:20PM PDT
Chevron's refinery in Richmond confirms that there is flaring going on as of 4:20 p.m. In a statement, the company said there is no need to shelter in place.
Chevron says flares are, "a highly-regulated safety device monitored by the air district, used in refineries to relieve pressure."
This is said to be an isolated incident and the refinery continues to operate, according to the company.
It was classified as a "level one incident" which means some hazardous materials were released, with the possibility of impact off the site of the plant.
No shelter in place warning was issued.