Ariz. Admin. Code § 11-1-404

Current through Register Vol. 30, No. 50, December 13, 2024

Section R11-1-404 - Airborne Contaminants

Except as permitted by R11-1-406:

1. Except as provided in subsection (2) the exposure to airborne 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 thresholds shall not be of a greater magnitude than is characterized 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 Employees shall be withdrawn from areas where there is present an airborne contaminant given a "C" designation by the conference and the concentration exceeds the threshold limit value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 concentration 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 asbestos fibers in excess of 10 fibers longer than 5 micrometers, per milliliter of air as determined by the membrane filter method over a minimum sampling time of 15 minutes. "Asbestos" is a generic term for a number of hydrated silicates that, when crushed or processed, separate 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 Actinolite.

Ariz. Admin. Code § R11-1-404

Former Rule 4:04; Amended effective April 7, 1976 (Supp. 76-2). Amended effective August 18, 1980 (Supp. 80-4).