They are still operating on those frequencies you listed. I think originally they were for the PW but sincw it had better coverage, they were re-allocated to the FD. Other than that I have no further info.
The expired license still says it's for public works. The FD's license still lists the frequencies that PW is using. I guess no one bothered to update them. Maybe whoever at PW was supposed to renew the license figured it's not their job any more since the FD is using those frequencies.