Identification of a standard threshold shift (STS) for individuals with a very poor sense of hearing.
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.
November 17, 1989
Mr. Stephen Gee
System Designer
Formerly Environmental Health Associates
ENSR Health Sciences
1320 Harbor Bay Parkway Suite 100
Alameda, CA 94501
Dear Mr. Gee:
This is in response to your letter of October 12, 1989, addressed to MaryAnn Garrahan, concerning the identification of a standard threshold shift (STS) in hearing ability for individuals with a very poor sense of hearing.