(NEW YORK) -- ConocoPhillips on Monday reported excess emissions that resulted in flaring at its San Francisco-area oil refinery in Rodeo, Calif.

The notification to the California Emergency Management Agency didn't specify whether the flaring was planned, or perhaps associated with a restart of a process unit, or units, following turnaround maintenance that got under way March 5.

Traders doing business in the region said at that time that maintenance was being performed at the plant's crude and coker units and a reformer. That work was expected to last until the end of March, the traders said then.

ConocoPhillips doesn't comment on refining operations.

The Rodeo refinery is able to process up to 120,200 barrels of crude oil a day.