You might try entering PL 156.7 to filter Boulder Valley Schools out. If I remember correctly, the Diamond Peaks Ski Patrol radios are programmed for CSQ RX and PL 156.7 encode on TX. It is very difficult to copy any traffic on their frequency since the frequency is simplex and they use handhelds to communicate with one another. Its far more likely that you'll hear them come up on the LCSO VHF channels (specifically FIRENET) using the callsign "DIAMOND."