Dave,
You are correct, sir. My notes show 482.4125 (the old CW4-SI, now the current PBSI) going from 123.0 to 100.0. As to the volume of radio traffic to be expected on CW4 - once again you are correct...while the channel is available in a limited number of radios for use, the frequency is primarily used for testing (i.e. digital mode) - and right now no tests are being conducted.
SCANdal