ORD export to dwg in survey feet

If there is anyone that has exported a dgn to dwg and have gotten the dwg to have survey feet as the units can you explain how you got it accomplished.

I'm in talks with Bentley now.  For those that work in survey feet, know that the files you export are in feet.  If someone else uses these files that are in feet with their files that are in survey feet.  Well it's about 3' off in central Illinois.

Thanks