I've seen the 2T22 at Chaffey before; it's located near the Cafeteria and Library building. The whole thing sits on a very short pole near a slope; you could be on a path 35 feet away and be level with the lower row of horns.
I haven't been to Chaffey for a while (I'm a Mt San Antonio College student currently) but some of my friends who attend say they still see it whenever they pass. I'll have to plan a trip out there for a snapshot when I have time but currently, I'm siren hunting in West Covina near my school.
Speaking of sirens in So. Cal, I just remember a picture I took of a siren while the youth group at my church was staying with some people we knew in a community called Pine Mountain just north of Kx250rider's location. It's located on top of a fire station and probably was used for calling volunteer fire fighters. One person I spoke to who saw me looking at it told me "oh, that's an old alarm we used to use for fire calls but we don't use it anymore."
I know of another mountain community (Wrightwood) with sirens at their fire stations but I didn't get a picture the last time I was there. As soon as it snows, I'll get a picture when I go snowboarding at the nearby Mountain High resort.