Carbon monoxide alarm at Wallace Drive home Heard on: Contra Costa County Fire Protection District 00:08 00:00 Engine 11, Transcript This transcript is auto-generated from live dispatch audio and may be incomplete or inaccurate. It is not an official report and may change. 00:00 Engine 11, 00:02 hazardous condition for CO alarm, (number withheld) Wallace Drive, cross of Cardinet Drive. 2026-09-10 11:08 UTC Fire Wallace Dr, Clayton, CA 94517 View on map