Author, Megan Lockhart, Media Communications and Client Services Coordinator, Rancho Mesa Insurance Services, Inc.

On July 20, 2023, the Cal/OSHA board approved a petition that requested an emergency temporary standard for respirable crystalline silica, a byproduct of manufacturing and cutting artificial stone material.  

The petition was submitted to Cal/OSHA by the Western Occupational and Environmental Medical Association (WOEMA). It argued that the recent increase in advanced silicosis cases documented in California hospitals made heightened silica regulations necessary.

The permissible exposure limit (PEL) at which current silica safety requirements apply, is 50 micrograms per cubic meter of air over the course of an 8-hour shift. Employees whose interactions with respirable crystalline silica surpass this limit are required to implement control measures and wear personal professional equipment (PPE) in order to reduce exposure.

WOEMA advised that workplaces using engineered stone with a silica content greater than 50% should put in place the following ETS standards.

• Regulated areas to limit employee access to spaces where artificial stone is fabricated.

• Restrictions on fabrication without the use of water to suppress dust.

• The use of airline respirators or power air-purifying respirators (PAPRs) for all work involving fabrication of artificial stone.

• Annual reporting letters from employers to the Cal/OSHA Occupational Carcinogen Control Unit on the use of silica.

• Strengthened penalty structure so that violations of the ETS result in citations classified as serious.

• Updated information on CT exams and other diagnostic studies, prepared by Cal/OSHA.

• Requirements that physicians or other licensed health care professionals report moderate to severe silicosis diagnosis to Cal/OSHA.

The Cal/OSHA staff’s evaluation concluded that most of the petition’s requested requirements were already part of the current standard for silica in construction environments. It therefore advised the board to deny adopting an ETS and instead, update the current permanent standards where needed.

However, in a contested decision, the board ultimately went against their staff’s recommendation, and approved the request to enact an ETS.

Cal/OSHA is expected to draw up the new emergency temporary standards within the next couple months. Silica exposure occurs in industries that manufacture stone countertops, brick, concrete blocks, or ceramic products. This motion may affect construction clients who frequently work with these materials.

Further information regarding the current safety regulations for respirable crystalline silica can be found in Cal/OSHA’s Code of Regulations.