From what I have determined they are on a Tier3 trunking setup. But I haven't seen any channel "trunking" actually happening. But the two active frequencies I have seen are as follows:
462.400 TS1 CH1 TG1
464.750 TS1 CH2 TG2
462.400 TS2 CH4 TG4
I can only assume 464.750 TS2 could be "CH3" and have TG3 but I was not around long enough to track it fully.
Color codes are:
462.400 CC5
464.750 CC10