Medical call on Sierra Drive upgraded to ALS code 3 Heard on: Contra Costa County Fire Protection District 00:42 00:00 Upgrade us to ALS Code 3. 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 Upgrade us to ALS Code 3. 00:03 ALS Code 3, Contra Costa. 00:09 Fire engine 86, show's responding. 00:12 Engine 86 responding. 00:21 Sierra Drive, this is on the request of Truck 1 requesting upgrading code three ALS. 00:26 BLS 23, you can cancel. 00:30 BLS 23, copy cancel. 00:35 20, you can cancel the engine. 00:40 Engine 86, you can cancel. 9/7/2026 01:01 AM Medical Emergency Sierra Dr, Walnut Creek, CA 94596 View on map