South Metro Fire Rescue ARFF responds on this talkgroup with Airport Operations personnel for all aircraft alert level, medical and fire incidents. Snow removal and other general operational communication between the control tower and ground personnel also occurs on this talk group.

Air Alert 1 - Advisement to SMFR and no response.

Air Alert 2 - Inbound Emergency Aircraft. Response includes Red 1, Red 2, Red 3, 1 Medic Unit, 1 Safety Officer, 1 Battalion Chief

Air Alert 3 - Aircraft Emergency declared for an incident. Response adds 2 Engines, 1 Medic Unit, 1 Battalion Chief, 1 EMS Battalion Chief

"Port" Units are Airport Operations personnel. Port 5 is on-duty 24/7 and the primary radio contact. Lower number Port unit numbers represent higher ranking airport officials. 

For reference a map of the airport is available at this link

https://flightaware.com/resources/airport/APA/APD/AIRPORT+DIAGRAM/pdf