I was able to copy a P25 control channel on 407.83750 from the I-80 rest area above Vallejo, showing a system ID of BF3. Based on the frequencies and their use on other systems in the database, I'm thinking it's related to a VA Hospital. I didn't hear any traffic.
Network: BEE00.BF3
Bandplan #0: Base=400.06250 Offset=+9 Spacing=6.25 BW=12.5
Bandplan #1: Base=400.06250 Offset=+9 Spacing=12.5 BW=12.5 Slots=2
Bandplan #2: Base=400.06250 Offset=+9 Spacing=12.5 BW=12.5 Slots=2
Site: 1.1 NAC=BF1
Channel 0-1244: 407.83750 CC
Channel 0-1308: 408.23750 SCC