Text For Citation: 01 Item/Group: 003 Hazard:

29 CFR 1910.1053(c): The employer did not ensure that no employee was exposed to an airborne concentration of respirable crystalline silica in excess of 50 g/m3, calculated as an 8-hour TWA: a) Baja Design, Inc., 1285 South Kalamath Street, Denver CO: On March 22, 2024, and at times prior, employees were exposed to airborne crystalline silica exceeding the permissible exposure level of 50 micrograms per cubic meter of air while manufacturing cultured and natural stone countertops. Personal air sampling performed for 202 minutes indicated an exposure at a concentration of 241.98 micrograms per cubic meter of air, approximately 4.84 times the permissible exposure limit. The exposures are based on an 8-hour time weighted average sampling period; exposure calculations included zero-increment for the 278 minutes not sampled. b) Baja Design, Inc., 1285 South Kalamath Street, Denver CO: On March 26, 2024, and at times prior, employees were exposed to airborne crystalline silica exceeding the permissible exposure level of 50 micrograms per cubic meter of air while manufacturing cultured and natural stone countertops. Personal air sampling performed for 265 minutes indicated an exposure at a concentration of 77.29 micrograms per cubic meter of air, approximately 1.55 times the permissible exposure limit. The exposures are based on an 8-hour time weighted average sampling period; exposure calculations included zero-increment for the 215 minutes not sampled. c) Baja Design, Inc., 1285 South Kalamath Street, Denver CO: On March 26, 2024, and at times prior, employees were exposed to airborne crystalline silica exceeding the permissible exposure level of 50 micrograms per cubic meter of air while manufacturing cultured and natural stone countertops. Personal air sampling performed for 262 minutes indicated an exposure at a concentration of 84.6 micrograms per cubic meter of air, approximately 1.69 times the permissible exposure limit. The exposures are based on an 8-hour time weighted average sampling period; exposure calculations included zero-increment for the 218 minutes not sampled. d) Baja Design, Inc., 1285 South Kalamath Street, Denver CO: On March 28, 2024, and at times prior, employees were exposed to airborne crystalline silica exceeding the permissible exposure level of 50 micrograms per cubic meter of air while manufacturing cultured and natural stone countertops. Personal air sampling performed for 228 minutes indicated an exposure at a concentration of 147.25 micrograms per cubic meter of air, approximately 2.945 times the permissible exposure limit. The exposures are based on an 8-hour time weighted average sampling period; exposure calculations included zero-increment for the 252 minutes not sampled. e) Baja Design, Inc., 1285 South Kalamath Street, Denver CO: On March 28, 2024, and at times prior, employees were exposed to airborne crystalline silica exceeding the permissible exposure level of 50 micrograms per cubic meter of air while manufacturing cultured and natural stone countertops. Personal air sampling performed for 218 minutes indicated an exposure at a concentration of 116.26 micrograms per cubic meter of air, approximately 2.325 times the permissible exposure limit. The exposures are based on an 8-hour time weighted average sampling period; exposure calculations included zero-increment for the 262 minutes not sampled. f) Baja Design, Inc., 1285 South Kalamath Street, Denver CO: On April 24, 2024, and at times prior, employees were exposed to airborne crystalline silica exceeding the permissible exposure level of 50 micrograms per cubic meter of air while manufacturing cultured and natural stone countertops. Personal air sampling performed for 415 minutes indicated an exposure at a concentration of 139.19 micrograms per cubic meter of air, approximately 2.78 times the permissible exposure limit. The exposures are based on an 8-hour time weighted average sampling period; exposure calculations included zero-increment for the 65 minutes not sampled.