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This Appendix contains a listing of toxic and reactive highly hazardous chemicals which present a potential for a catastrophic event at or above the threshold quantity.
OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov.
March 25, 1992
Mr. Thomas G. Grumbles
Manager Environmental Affairs
Vistal Chemical Company
900 Threadneedle
Houston, Texas 77079-2990
Dear Mr. Grumbles:
This is in response to your letter of March 2, requesting a clarification on the listing of Hydrogen Chloride in Appendix A of the Process Safety Standard which was promulgated by the Occupational Safety and Health Administration (OSHA) on February 24, 1992 (57FR 6356).
