Penobscot Fire Dispatch 3

[BlackSheepDue]

I see that Penobscot Fire Dispatch 3 has been added to the database. Does anyone know it's intended use? As long as I can remember it was always COMM 2(Now Fire 1) for anything east of Route 15 and COMM 3(Now Fire 2) for anything west of Route 15 so not sure how a 3rd channel would fit into that split.