MEMORANDUM FOR: REGIONAL ADMINISTRATORS AND STATE PLAN DESIGNEES THROUGH: DOROTHY DOUGHERTYDeputy Assistant Secretary FROM: THOMAS GALASSI DirectorDirectorate of Enforcement Programs SUBJECT: Process Safety Management of Highly Hazardous Chemicalsand Covered Concentrations of Listed Appendix A Chemicals This memorandum revises OSHA’s enforcement policy on the concentration of a chemical that must be present in a process for...