It's definitely JCSO. Like I said, I heard Sam, a JCSO dispatcher, talking on it yesterday.
I've listened to it all day today. It seems to be a supervisor channel. I heard the dispatcher asking about meeting someone at the Forestdale substation, I heard a wreck with injuries in Concord, and other misc traffic.
I'm thinking it might be the channel the LT stays on. It appears to be that.