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In-depth survey report: control technology for removing lead-based paint from steel structures: abrasive blasting inside two ventilated containment systems at Bridge Street and Shribner Street overpass, Seaway Painting Company, Inc., Grand Rapids, Michigan.

Mickelsen RL; Froehlich PA
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, ECTB 183-14a, 1994 Dec; :1-22
This report examined two separate containment, ventilation, and abrasive blasting systems for removing lead based paint from steel structures. The first system consisted of abrasive blasting with low silica (AS) sand, Star Blast XL in a large enclosure made of interconnected canvas tarps suspended from the top of the roadway down to the ground, creating a room with a volume of 200,000 cubic feet. The second system consisted of abrasive blasting with recyclable steel grit in a 3,000 cubic foot enclosure made of an alloy piping for the frame, rigid corrugated polycarbonate panels for the sides and an aluminum grating floor. These control systems were tested during the abrasive blasting of the Bridge Street and Shribner Street Overpass, in Grand Rapids, Michigan. In both the large and small containment, the workers donned a single use dust respirator under a continuous flow, loose fitting hood respirator prior to entering the containment and did not remove the respirator inside the containment. The large containment dilution ventilation system was almost of no value in reducing airborne lead (7439921) exposures for workers inside the containment. The authors conclude that workers inside both ventilated containment structures during dry abrasive blasting may be exposed to airborne lead concentrations in excess of 100 times the OSHA Permissible Exposure Level for lead. Environmental monitoring should be routinely performed to measure worker exposure to airborne lead and other hazardous agents. The practice of smoking prior to hand washing and smoking near the containment must be discontinued.
NIOSH-Author; NIOSH-Survey; Field-Study; Region-5; Construction-industry; Control-technology; Metal-dusts; Lead-dust; Airborne-dusts; Air-quality-control
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Field Studies; Control Technology
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National Institute for Occupational Safety and Health
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division