According to the FCC database, there are several frequencies licensed to Kaiser. The following are associated with the hospital on Interstate:
462.0125
464.0625
And these are listed, but are possibly input frequencies.
467.0125
469.0625
FCC lists that there is 1 base at 100 watts output, and 45 mobile units at 4 watts each.
I don't know if these are Security, and I have not monitored any of these personally.
Good luck.