What scanner are you using?
I'm not from the area, but it looks like that's about all your gonna hear on a non-digital/conventional trunking scanner. It looks like they use the P25 TRS and dispatches are repeated on the conventional CH's.
I am using a Baofeng UV-5R. I'm using the 453.9750 frequency for the dispatch. I was assuming that the fire ground channels would be in that same frequency range. I thought that the DEC was the change in the frequency and tried 453.9751 for fireground 2.