GOD uses metric! Just yesterday I counted my fingers - 10. Last week I did an inventory of my toes - 10.
Dan, I know you well enough to know you're joking, but for those that may be thinking Dan is serious, consider this: There are numerous factors that go into making something end-up the correct dimensions for the final product on completion day.
If I had to guess (and I have no foreknowledge whatsoever), I would place my bet on the cast-in-place concrete deck members being out-of-place. Possibly an easy fix, possibly not an easy fix. Either way, someone dropped the ball - but it's not a problem with the actual measuring system itself. Conversions, on the other hand; as Harry pointed-out can wreak havoc on "matching parts"!
Otis Guillebeau from Auburn, Georgia (I was born metric)
OPG3 Tweak everything!