I was listening to those tg's exclusively for a while this morning trying
to figure out who they are. At first I thought they may have been
District Protective Services [who I identified as operating on 34832
& 34864 of this system], but they sound more like a contract/private
security company or utility. It may be hard to figure out who they are
since they usually refer to locations by 'post x', etc.
-dc2wheel