DEPARTMENT OF LABOR AND ECONOMIC OPPORTUNITY
DIRECTOR'S OFFICE
GENERAL INDUSTRY SAFETY AND HEALTH STANDARD
(By authority conferred on the director of the department of labor and economic opportunity by
sections 14, 16, 19, 21, and 24 of the Michigan occupational safety and health act, 1974 PA 154,
MCL 408.1014, 408.1016, 408.1019, 408.1021, and 408.1024, and Executive Reorganization
Order Nos. 1996-1, 1996-2, 2003-1, 2008-4, 2011-4, and 2019-3, MCL 330.3101, 445.2001,
445.2011, 445.2025, 445.2030, and 125.1998)
PART 590. SILICA IN GENERAL INDUSTRY
R 325.59001 Scope, application, adoption, and availability of standards.
Rule 59001. (1) This standard applies to all occupational exposures to respirable crystalline silica,
except as follows:
(a) Construction work as covered by Construction Safety and Health Standard Part 690. “Silica
in Construction.”
(b) Agricultural operations covered under Occupational Health Standard Part 700.
“Agriculture.”
(c) Exposures that result from the processing of sorptive clays.
(2) This standard does not apply where the employer has objective data demonstrating that
employee exposure to respirable crystalline silica will remain below 25 micrograms per cubic
meter of air (25 μg/m3) as an 8-hour time-weighted average (TWA) under any foreseeable
conditions.
(3) This standard does not apply if the employer complies with Construction Safety and Health
Standard Part 690. “Silica in Construction” and both of the following apply:
(a) The task performed is indistinguishable from a construction task listed on Table 1 in 29 CFR
1926.1153(c) of Construction Safety and Health Standard Part 690. “Silica in Construction.”
(b) The task will not be performed regularly in the same environment and conditions.
(4) The following federal Occupational Safety and Health Administration (OSHA) regulations
are adopted by reference in these rules:
(a) 29 CFR 1910.1053 “Respirable crystalline silica,” as amended May 14, 2019.
(b) 29 CFR 1910.1053, appendix A “Methods of Sample Analysis,” as amended March 25,
2016.
(c) 29 CFR 1910.1053, appendix B “Medical Surveillance Guidelines,” as amended March 25,
2016.
(5) A reference to 29 CFR 1910.94 means Occupational Health Standard Part 520. “Ventilation
Control.”
(6) A reference to 29 CFR 1910.134 means General Industry and Construction Safety and Health
Standard Part 451. “Respiratory Protection.”
(7) A reference to 29 CFR 1910.1020, means General Industry and Construction Safety and
Health Standard Part 470. “Employee Medical Records and Trade Secrets.”
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