Sounds like Orangeburg County FD is using SCTAC4 853.6375 PL 156.7 for fire dispatching. Fire tone-outs are being simulcasted with their Palm800 TG. Hearing this from Lexington.
grcjrsc posted the same thing last year. I don't get through Orangeburg often, but when I did pass through a few months ago I heard dispatches on their normal VHF channels. Seems like a strange use for an interop channel as a long-term solution.