The greatest potential for over-exposure generally occurs during transfer operations involving concentrated chemicals. Conduct these operations in a laboratory chemical hood to minimize the potential for over-exposure. Refer to Chapter 17: Laboratory Hoods for more information.

EHS will perform monitoring upon request, or if there is reason to believe that exposure levels for a substance routinely exceed the OSHA-defined Permissible Exposure Limit (PEL) or action level. Any employee may request monitoring and be notified of the results, in writing, within 15 days of the receipt of the results. To file a formal request for monitoring, complete Appendix 1-B and send, or deliver, to EHS. EHS also responds to telephone requests for evaluation of exposure to chemicals and provides monitoring if appropriate.