From Dayton 2015:
141.175 Aux 1
235.250 Pri 1
322.950 Pri 2
413.275 (67.0) Road 1
413.325 (67.0) Road 2
Those two ground freqs are the official channels they use (it's in their support handbook). If there is a conflict, the local frequency manager is in charge of finding them something to use.
Be cautious of stale information. 90% of lists are thrown around with frequencies that haven't been used in years.