I've noted that my Pro-96/Pro-2096 radios will sometimes bleed talkgroups. That is, I'll see a TGID for something that doesn't match the traffic. I attribute this to a defect in the radios.
If you aren't using one of these radios then it probably doesn't apply.
Thanks for the insight, but I'm using the Pro-106/197 series of scanners. So this is definitely native to the 2999 TG.
Edited to add: Ok, so I looked at a map of the CCHN clinics and saw that they do have clinics in Arvada and one on Potomac Street in Aurora. So far (according to the CCHN website) the only thing these locations have in common is their inclusion in the "Metro Community Provider Network". I'll keep monitoring though.
I just looked up the Metro Community Provider Network and found that a lot of the location names that are being given correlate with a lot of the clinic names or locations in the Metro Community Provider Network. For example:
South = South Aurora Clinic
North = North Aurora Clinic
Arvada = Arvada Clinic
Potomac = Potomac Street Clinic
JeffCo = JeffCo Clinic
My best guess at this point is that this is some sort of security patrol for the Metro Community Provider Network. More as it develops.