128.9 is San Francisco Radio (ARINC) I can hear aircraft on it but never the base side with it being in southern Colorado.
131.2 Listended all day and didn't hear a peep. I'll keep it in a radio.
462.0 I see NXDN and DMR on this freq, but nothing that is CAP+. I'll keep watching it.
462.0875 is indeed Delta Ops.