The tone testing was temporary. York County has been managing the Hampton 911 center and apparently takes over the radio system completely for certain shifts. The tones appeared also on YC old FD of 154.400- I do not know if this will occur again or was just a test or one time anomaly.
I also noticed YC has renewed three VHF frequencies under license KXE 560- 154.400, 154.010 and 154.265. Also YC has a new license call sign WRMN 383 under Hampton new frequencies but on YC system.