I just heard the one burst of activity, and there was no context, just a round of check-ins. I just happened to be on monitoring after dusting off my SDS200 to try out the latest database updates. I'll setup recording and hopefully get enough info to draft a DB submission.
I think it's a Regional talkgroup for Regional services or something like that. RID 581xxxx and similar were seen on that TG and some other Regional talkgroups. 5309 is Region of Waterloo Security for the Region buildings.
So far These are the RIDs That Are Commonly Seen:
1xxxxxx - Fire
2xxxxxx - Unknown (Once in a long while keys up on the Fire/WRPS patch TGs)
3xxxxxx - WRPS
4xxxxxx - Transit
5xxxxxx - Regional Services
This list is from a 2018 Region of Waterloo Agenda:
I believe this was noted when they were still using the EDACS system.
Cambridge By-Law
Cambridge Fire Department
Cambridge Public Works
Grand River Transit
ION (Region of Waterloo Light Rail Transit)
Kitchener By-Law
Kitchener Fire Department
North Dumfries Township Fire Department
Waterloo By-Law
Waterloo Fire Rescue
Waterloo Public Works
Waterloo Regional Airport;
Waterloo Regional Paramedic Services
Waterloo Regional Police Service (WRPS)
Waterloo Region Emergency Measures Office
Waterloo Region Security Services (including security dispatch) - (TG: 5309)
Waterloo Region Transportation
Waterloo Region Waste Management
Wellesley Township Fire Department
Wilmot Township Fire Department
Wilmot Township Public Works
Woolwich Township Fire Department