As an employer, you should always be prepared for an inspection by OSHA or any other regulatory agencies.  As such, it is critical to perform the necessary risk and exposure assessments. You should be prepared to provide documentation that you have trained your employees on their Right-To-Know (Hazard Communication) and have the most current SDS available.  You should also be in position to justify the required PPE for the tasks they are performing and the materials they are working with.
Good housekeeping is critical to ensure there is no bias during the sampling event.  If you have exposure-monitoring data for the tasks or areas that OSHA wishes to assess, then you should have your historical data readily available.  If no exposure-monitoring data exists, it is advisable that you hire a third-party industrial hygienist to replicate the industrial hygiene study that OSHA is undertaking.