Considering I'm surrounded by state parks here in Newhall I monitor CSP as often as I monitor county fire and sheriff. Lately I've been noticing on Jade they have been calling it 'Torrey' - a quick Google search finds a nature preserve near San Diego by this name but no nearby mountains or peaks. Are any of you familiar with the 'Torrey' reference?
What state parks surround Newhall? The only one that I'm aware of is Placerita Canyon and it is run by the county. Castaic Lake is also run by the county. The next nearest is the Hungry Valley OHV area north of Gorman. The parks in vicinity of your location are in the Angeles District, not to be confused with the Angeles National Forest.
I would imagine it is tough to receive much in the way of state park repeaters due to topography. My notes show that the San Diego District does not use Jade and the only repeater sites used by the San Diego District that you might receive, and this is highly doubtful, are those located on Jack's Peak on Catalina Island.
I searched licenses for 868.5625 MHz in southern California and did not come up with anything up your way. There are about 1/2 dozen in the Angeles District, but none of them are within what I would think your reception area is. I also looked at my state wide printout of State Park repeaters and did not find Torrey listed.
After considering the above and the comment of rickyrsq34 above, I took a look at the state's communication site map and there is a West Torrey Hill due south of Piru on Oak Ridge. The site is primarily a CHP site but other agencies are there, most notably Ventura County and the Los Padres National Forest. Although there isn't a license for Jade located there it would be logical that you would hear it from Newhall. I think the Santa Clara River canyon provides an opening for you to be able to receive it.
If you listen carefully you will hear the name "Torrey" used as the site a unit, park or Surcomm uses to call another unit or location. You would hear "826, Surcomm, Torrey" or "Surcomm, 241 on Torrey." When I used to stay at my mother's in the LAX area I would hear traffic similar to "Surcomm, 805, Baldwin." There is a repeater on Jade in the Baldwin Hills north of Inglewood. This is standard practice State Parks procedure statewide and is also that of federal natural resource agencies. On a Forest Service frequency you would hear something like "Los Padres, Patrol 71, Tone 6." Tone 6 corresponds to Torrey Hill. I believe the traffic you are hearing involves Santa Susana Pass State Historic Park.
I think this solves your mystery.
*EDIT* I was preparing this post at the time you last posted.
