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Silica-OSHA Issues Final Rule for Exposure to Crystalline Silica

If you need assistance in interpretation or compliance with the new OSHA Silica Regulations discussed in this article call us at 973-366-4660 or email us at info@atlenv.com for details and a free estimate.


Written by Robert E. Sheriff, MS, CIH, CSP, President

November 6, 2018


OSHA now extends the compliance date from June 23, 2017 to September 23, 2017 for the Construction Industry. This notice was issued on April 6, 2017.

OSHA issued the final rule for new regulations for exposure to crystalline silica on March 23, 2016.

Separate regulations were issued for Construction (29CFR1926.1153) and General Industry/Maritime (29CFR1910.1053).

The general provisions to both regulations are generally the same:


  1. Permissible Exposure Limit (PEL) over an 8-hour shift is 50 mg/M3 of air.
  2. Action Level of 25 ug/M3.
  3. Requires employers to use engineering controls to limit worker exposure where sampling indicates a level above the PEL.
  4. Respirators as a supplement to engineering controls where such efforts won’t adequately control exposure.
  5. Develop a written control plan.
  6. Medical exams.
  7. Training.
  8. Final Rule will take effect on June 23, 2016, (60 days after publication).


Compliance dates for the separate regulations are different:

For Construction, the effective date is June 23, 2017. Now changed to September 23, 2017

For General Industry and Maritime, the effective date is June 23, 2018. (Note the 1 year extension over Construction).

NOTE: Hydraulic Fracking, although part of Construction, has an effective date of June 23, 2018 but engineering controls have a compliance date of June 23, 2021 (5 years!)

Those of us in the occupational health profession have expected these new regulations for some time. There are many activities in Construction and Industry where exposures have not been well controlled. Also, the previous regulation had a formula for calculating the exposure level (the greater the % silica the lower the PEL) which was confusing and difficult to explain.

The new standards have a lower PEL and more protection of workers but also easier to comprehend and explain to involved employers and employees.

From experience, the most likely sources of overexposure in Construction are:


  • Dry concrete cutting
  • Sand and gravel operations
  • Concrete mixing—including Redimix
  • Mining including rock, salt, coal, other minerals
  • Construction excavation especially where rock is involved
  • Dry aspects of fracking—all stages
  • Some wet cutting operations


Overexposure potential in General Industry are:


  • Sand and concrete/mortar packaging
  • Stone cutting both dry & wet
  • Marble cutting both dry & wet
  • Brick and block manufacturing
  • Gravestone cutting and lettering
  • Countertop manufacturing
  • Refractory products (bricks and cement)
  • Glass manufacturing
  • Foundries especially sand casting


There are many other commercial activities that handle sand as part of their processes—both in Construction and General Industry. The best approach is to carefully review the Safety Data Sheets (SDS) for all raw materials to determine if silica is present in reportable quantities. If so, it is prudent to have the work activities that use those silica containing raw materials monitored. The proper method of sampling/testing is the use of a portable air sampler worn by the worker for a full work shift. Samples will be analyzed for respirable dust and silica and compared to the 50 ug/M3 PEL.

The final rule can be found on OSHA’s website at www.osha.gov/dsg/topics/silicacrystalline/

Solutions to overexposure are widely varied. OSHA has established specific approaches depending on the work activity. Consult the appropriate OSHA Standard (industry construction) for specific requirements. The most common approach is to convert a dry process to wet methods.

Wet methods by themselves are not always totally effective simply because a very fine mist can also carry the silica particles in such a size range that they can be inhaled.

The first step, of which many organizations have already taken in anticipation of this new regulation, is to monitor the worker’s exposure through personnel sampling/testing.

The sampling results will determine what actions are needed (if any) to achieve compliance.

Atlantic Environmental has the capability of monitoring worker exposure, developing control plans and performing the necessary training, as well as recommending solutions to identified problems.


Our primary service areas for Industrial Hygiene Sampling/Testing are: NJ, NY, NYC, PA, CT, DE, (Boston) MA, RI, Wash DC, WI, MD, MI, (Chicago) IL, VA, IN, (Atlanta) GA, AL, NC, SC, TN, (Dallas, Ft Worth) TX, OK, DC, AR, we can service most other areas of the U.S. but with some added travel charges.

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