Person having seizure near Slate Quarry Road off Thurston Road Heard on: Frederick MD Fire Dispatch Group Calls 00:17 00:00 Ambulance 239 to (number withheld) Slate Quarry Road off Thurston Road, seizure nine Bravo, 1704. 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 Ambulance 239 to (number withheld) Slate Quarry Road off Thurston Road, seizure nine Bravo, 1704. 00:11 Ambulance 239 responding, (number withheld) Slate Quarry Road off Thurston Road, seizure nine Bravo, 1704. 2026-09-05 14:04 UTC Medical Emergency Slate Quarry Rd, Dickerson, MD 20842 View on map