To be practical, the EOR should be consulted to see if he can accept another compaction criterion.
For rock fill, we recently placed it and did 2, 4, 6, 8 and 10 passes of the heavy vibratory compactor. We then plotted the "settlement" vs each set of passes to get a curve - then, as suggested in article "Rock Fill" - one of four articles (can't remember URL off hand), we chose the number of passes that achieved > 80% of the settlement. We also rolled in both directions.
What is the practical sense of trying to achieve a compaction of material that doesn't meet the type of material presumed in the standard test? Why was it even specified if the EOR put such a range on the acceptable fill materials? Seems like the spec was a standard used without thinking . . .