Here is a timeline of the events in the aftermath of the fire at the Chevron Richmond refinery in 2012. Aug. 6, 2012: Fire breaks out at the Chevron Refinery in Richmond about 6:15 p.m. Contra Costa County issued a shelter-in-place warning for surrounding areas. More than 15,000 people sought medical treatment in the weeks following. Aug. 24, 2012: The U.S. Chemical Safety Board and the California Division of Occupational Safety & Health came an agreement with the United Steelworkers and Chevron to initiate an investigation into the fire. Sept. 11, 2012: CSB provided a presentation and investigation update to the Richmond City Council. Sept. 24, 2012: A community workshop was held concerning the fire. Top Chevron executives were heckled by the crowd. Sept. 26, 2012: State Assemblywoman Nancy Skinner, D-Berkeley, and state Senator Loni Hancock, D-Berkeley, called for a state oversight hearing concerning the fire. Jan. 30, 2013: Cal/OSHA issued citations to Chevron U.S.A. Inc. for state safety standard violations related to the fire. Feb. 14, 2013: CSB released metallurgy report regarding the fire. April 5, 2013: Contra Costa Health Services announced that it would exercise its authority under Richmond Industrial Safety Ordinance to conduct a full safety inspection and audit of the refinery. The purpose of the safety inspection/audit is to review the safety culture, process safety management systems, and human factors associated with the operation of the refinery. Also on that day, Chevron submitted a letter to Hancock providing an update on lessons learned since the fire incident, and actions Chevron is taking as part of its commitment to continuous improvement and to prevent a similar incident in the future. April 15, 2013: CSB officials released an interim report slamming Chevron for a chronic failure to replace aging equipment and called for an overhaul of regulatory oversight of the industry to prevent such accidents from happening again. Aug. 2, 2013: The city announced that it filed suit against Chevron for damages stemming from the fire. Aug. 5, 2013: Chevron agreed to pay $2 million in fines and restitution after pleading no contest to six misdemeanor criminal charges stemming from the fire. Chevron attorneys accepted the terms, including 3½ years of probation, $1.28 million in fines and more than $720,000 in restitution payments to three agencies. The penalties resulted from joint charges filed in Contra Costa Superior Court by state Attorney General Kamala Harris and Contra Costa County District Attorney Mark Peterson.