Text For Citation: 01 Item/Group: 001B Hazard:

29 CFR 1910.1000(a)(2):Employee(s) were exposed to an airborne concentration of particles not otherwise regulated respriable fraction listed in Table Z-1 in excess of the 8 hour Time Weighted Average concentration of 5.0 milligrams per cubic meter (mg/m3): On June 13, 2022, employees' abrasive blasting respirable dust exposures exceeded 5.0 mg/3, as an 8-hour time weighted average. a. An employee engaged in abrasive blasting activities on June 13, 2022, and was exposed to particles not otherwise regulated respriable fraction as an 8 hour time weighted average of 9.47 mg/m3, approximately 1.9 times the permissible exposure limit of 5.0 mg/m3; this limit was established to prevent adverse health effects. The abrasive blaster used coal slag/glass mixture to abrasive blast media to blast various pieces of metal. The exposure level was derived from three samples collected over 269 minutes, the remaining 211 minutes was calculated as zero (0) exposure time. b. An employee engaged in abrasive blasting activities on June 13, 2022, and was exposed to particles not otherwise regulated respriable fraction as an 8 hour time weighted average of 551.05 mg/m3, approximately 110 times the permissible exposure limit of 5.0 mg/m3; this limit was established to prevent adverse health effects. The abrasive blaster used coal slag/glass mixture to abrasive blast media to blast various pieces of metal. The exposure level was derived from three samples collected over 345 minutes, the remaining 135 minutes was calculated as zero (0) exposure time.