Parks is on SCC Access for dispatch and the old C-Tac-2 is now countywide L-Tac and used by parks. the 478 freq is "Park Tac". It's direct mode (no repeater) for use within the regional parks and is seldom used.
They're using SCC Access, C-Tac 2 and possibly Parks Tac 479.1000 Simplex for now. They're licensed to start using the new 478 MHz repeaters SCMA127 listed, its just a matter of getting all the repeaters, mobiles and HTs programmed. With the budget the way it is it could take a year or two to complete.