They are surrounded by hills and their radios don't have much reach, so I parked in their lot earlier. 469.950 is their maintenance frequency.
They used to run in the rain, but they had a double fatality earlier this week and they must have changed their policy. Since it rained just before I arrived, the track was closed and I wasn't able to hear their other registered frequencies. I'll head back on a better day to see if I can sort them out.