For Brea City fire dept.:
851.0625, 855.7125, 856.2125, 856.7125, 856.9625, 857.2125, 857.4625, 857.7125, 857.9625, 858.2125, 858.4625, 858.7125, 858.9625, 859.2125, 859.4625, 859.7125, 859.9625, 860.2125, 860.4625, 860.7125, & 860.9625 MHz trunked.
Brea Fire dispatch talkgroups:
496 Dispatch
560 Tactical
Other info for OC:
http://www.radioreference.com/apps/db/?sid=201