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 http://www.osha.gov.

January 24, 1980

MEMORANDUM FOR:   DAVID H. RHONE
                  REGIONAL ADMINISTRATOR REGION II

THRU:             ROGER CLARK, DIRECTOR
                  Field Coordination

FROM:             GROVER C. WRENN
                  Director, Federal Compliance and State Programs

SUBJECT:          Carbon Monoxide Alarm/Monitoring at Abrasive
                  Blasting Operations - [1910.134(i)(5-7)]
                  vs. 1910.94(a)(6)

In response to your request for interpretation of which of the above standards to use for abrasive blasting, our position is that the more specific standard applies i.e., 1910.94(a)(6) takes precedence over [1910.134(i)(5-7)] and should be the only one used.