HOUSTON, (Reuters) – The United Steelworkers union signed a tentative agreement on Thursday to bring an end to a strike that had been ongoing for nine weeks at the USW. Chevron According to sources, Corp (NYSE:),’s Richmond refinery in California is under negotiation.

The tentative agreement’s terms were not available immediately. Sources said that the tentative agreement must be ratified by members of USW 12-5. This is the union representing the 500 workers who took their job on March 21.