On March 25, 2016, OSHA published the long-awaited respirable crystalline silica rule, which the agency says will affect 2 million construction workers who drill, cut, crush or grind silica-containing materials such as concrete and stone, and 300,000 workers in general industry operations such as brick manufacturing, foundries and this hydraulic fracturing operation in Colorado.

Part II: Are You Ready for OSHA’s New Respirable Crystalline Silica Standard?

Feb. 8, 2017
This is the second article in a three-part series reviewing OSHA’s standard for respirable crystalline silica.

In Part I of this series analyzing OSHA's crystalline silica standard, I mentioned that the new permissible exposure limit (PEL) for respirable crystalline silica is 50 µg/m3 with an action level of 25 µg/m3. A series of requirements will be in effect depending on the employee’s exposure.

Exposure Assessment

Employers have two options to characterize the employee’s exposure. The first option or “Performance Option” is based on a combination of air monitoring data or objective data considered to accurately characterize the employee’s exposure. The other option is to conduct an initial monitoring assessment.

This option should consider the employee’s exposure for each job classification/shift/tasks where there is a potential for exposure to respirable crystalline silica. If the initial assessment shows results below the action level (25 µg/m3), no additional monitoring is needed unless there is a change in the process. If exposures are above the action level, but below the permissible exposure limit, the employer needs to repeat the assessment every six months. If exposures are above the permissible exposure limit then the assessment needs to be repeated every three months.

Part I: Are You Ready for OSHA’s New Respirable Crystalline Silica Standard? How the new PEL might impact employers in general industry and the maritime industry.

What if the initial assessment indicates that exposures are above the action level and/or the permissible exposure limit and the employer invests in controls to reduce the employee’s exposure? In that case, the employer should conduct two consecutive assessments, at least seven days apart, with results below the action level before discontinuing the scheduled monitoring. If monitoring is performed, the monitored employees should be notified in writing of the results of the assessment within 15 working days after completing the assessment. If the results are above the permissible exposure limit, the written notification should describe the corrective action being taken to reduce exposure of the employee below the permissible exposure limit (PEL).

Regulated Areas

A regulated area is an area where the airborne concentrations of respirable crystalline silica are/or are expected to be above the PEL. Therefore, the employer should limit the access to these areas, authorized employees working in these area should wear respiratory protection and install signage in the area stating “Danger, Respirable Crystalline Silica, May Cause Damage to the Lungs, Wear Respiratory Protection in This area, Authorized Personnel Only.”

Methods of Compliance

Similar to the lead standard, this new standard requires the implementation of engineering controls and a written exposure control plan. If exposures are above the PEL, this new standard requires employers to use engineering and work practice controls to reduce and maintain the employee’s exposures below the PEL. If such controls cannot lower the exposure to levels below the PEL, the standard calls for continued use of these controls to lower the employee’s exposures to the lowest feasible level and then require the use of respiratory protection.

The written exposure control plan should include the following items: a description of the tasks that involve exposures to respirable crystalline silica, a description of the controls (engineering, work practices and/or respiratory protection) for each of the affected tasks and a description of the housekeeping practices to limit the employee’s exposure to respirable crystalline silica. The standard calls for an annual review and evaluation of the effectiveness of this written plan.


This new standard would not allow dry sweeping and/or brushing if these activities could contribute to an increase employee’s exposure to respirable crystalline silica. It would allow wet sweeping, HEPA-filtered vacuuming or other methods that would minimize the employee’s exposure. The use of compressed air to clean clothing and/or surfaces would not be allowed unless the compressed air is used with a ventilation system that captures the dust cloud or no alternative method is feasible.

Part III will address the medical surveillance and training requirements.

Luis Pieretti joined MEMIC in 2013 as a safety management consultant and was promoted to manager, industrial hygiene, in 2016. He has more than 15 years of occupational safety, industrial hygiene and training experience in both the private and public sector. Prior to joining MEMIC, Pieretti held positions in the pharmaceutical and manufacturing industries and has worked as a safety and health consultant with USF SafetyFlorida’s OSHA On-Site Consultation Program, where he provided safety and industrial hygiene services to businesses in Florida. He also has been an instructor at the University of South Florida OSHA Training Institute Education Center. Pieretti graduated from the University of Puerto Rico with a master’s degree in industrial hygiene and from the University of South Florida with a doctoral degree in industrial hygiene. He has earned his certified industrial hygienist (CIH) and certified safety professional (CSP) designations and is a member of the American Society of Safety Engineers, the American Conference of Governmental Industrial Hygienists and the American Industrial Hygiene Association.

(Editor’s Note: This article and the other articles in this series are reprinted with permission from The MEMIC Group, specialists in workers' compensation insurance. These and other articles can be found in Safety Net, the All About Workplace Safety Blog published by The MEMIC Group.)

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