The control channel listed in the database for Santiago is incorrect? I find the control channel for Santiago is 454.503125 and/or 454.50625. Being the bandwidth of the scanner it could be either or in between.
The talkgroups I have activity on are,
670
671
672
673 Fire Dept North OC
674 Fire Dept South OC
I haven't figured out the dividing line yet.
675
676
The other talkgroups are for routine transport for OC & other counties, although I thought I did hear a dispatch for a fire dept response in LA county once.