Richard,
There was a link to an article last year. About anchor bolt tolerances. Could try Steel Tips, AISC and ASCC. Though I imagine your steel structures code should have some guidelines on position tolerances: for holes within a base plate and for position of columns and base plates. Alternatively can also make an assessment based on the permitted oversize of hole.
Regards
B.Tech (mfg & mech), MIIE, gradTIEAust
mailto:sch.tectonic@bigpond.com