Retaining Wall Drain Rock Backfill

[AKSherpa]

Any sugesstions for gradation of retaining wall drain rock backfill? See attached sketch. I am not sure about the retaining wall design assumptions, this design is by others. I am assuming the wall was designed as being in a drained condition. We are a potential aggregate supplier, have been asked to provide the drain rock in a remote location with limited aggregate availability.
Thanks

 

[TigerGuy]

The suppliers I have dealt with in the past try to make the fewest products that meet the widest range of standards. Example: they produce a #67 stone that can be used in concrete, or as drain rock.