 |
Arizona Administrative Code (Last Updated: November 17, 2016) |
 |
Title 11. MINES |
|
Chapter 1. STATE MINE INSPECTOR |
|
Article 4. AIR QUALITY, VENTILATION AND RADIATION, AND PHYSICAL AGENTS |
Section R11-1-404. Airborne contaminants
All data is extracted from pdf, click here to view the pdf.
-
Except as permitted by R11-1-406:
1. Except as provided in subsection (2) the exposure to air- borne contaminants shall not exceed, on the basis of a time-weighted average, the threshold limit values adopted by the American Conference of Governmental Industrial Hygienists. Excursions above the listed thresh- olds shall not be of a greater magnitude than is character- ized as permissible by the conference.
2. Employees shall be withdrawn from areas where there is present an airborne contaminant given a “C” designation by the conference and the concentration exceeds the threshold limit value listed for that contaminant.
3. The eight-hour time weighted average airborne concen- tration of asbestos dust to which employees are exposed shall not exceed two fibers per millimeter greater than 5 microns in length, as determined by the membrane filter method at 400-450 magnification (4 millimeter objective) phase contrast illumination. No employee shall be exposed at any time to airborne concentrations of asbes- tos fibers in excess of 10 fibers longer than 5 microme- ters, per milliliter of air as determined by the membrane filter method over a minimum sampling time of 15 min- utes. “Asbestos” is a generic term for a number of hydrated silicates that, when crushed or processed, sepa- rate into flexible fibers made of fibrils. Although there are many asbestos minerals, the term “asbestos” as used herein is limited to the following minerals: Chrysolite, Amosite, Crociodolite, Anthophylite, Tremolite, and Act- inolite.