Michels Corporation is one of the companies working on that pipeline. I know that 151.625 is in use by them -- it's a DMR repeater, CC 12 with frequency of 151.625. It carries multiple talkgroups but it is encrypted.
I'm sure there are others working on the pipeline, but so far neither myself or a buddy of mine up near Hanoverton have been able to determine what other frequencies are in use by the pipeline construction crews.
Mike