Here's how the Chevron fire incident happened, based on reports by Chevron, Contra Costa Hazardous Materials and Richmond residents:

4:15 p.m.: Incident starts in No. 4 diesel-processing unit with vapor leak

Around 6:30 p.m.: Leak volume increases, employees evacuated, shortly thereafter fire ignites and Chevron pushes a Level 3 button, automatically sounding sirens, alerting media and paging county health officials

6:37 p.m.: Contra Costa Hazardous Materials agency receives page from Chevron about incident

Around 6:40 p.m.: Contra Costa decides to phone residents who may be in line of smoke to tell them to shelter in place

9:30 p.m. Some residents within a mile of fire still getting phone call notifications

11:12 p.m. Contra Costa lifts shelter in place order for Richmond, North Richmond and San Pablo



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