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

29 CFR 1910.1000(e): Feasible administrative or engineering controls were not determined and implemented to achieve compliance with the limits prescribed in 29 CFR 1910.1000(a) through (d): (a) Block House: On or about October 13, 2020 feasible engineering controls including, but not limited to, operation of all exhaust fans in the work area were not implemented to reduce employee exposures to carbon monoxide. An employee (Block House Manager) was exposed to carbon monoxide (CO) at a mean calculated 1156.7 ppm CO level (SAE = 0.146). The %COHb in the employee's blood reached a calculated peak level of 39.4%. Atmospheric pressure, height, weight, activity levels, tobacco smoking behavior, and other factors were taken into account. The 8-hour TWA exposure was 144.6 ppm CO ( SAE = 0.092), which is 2.89 times the OSHA PEL of 50 ppm CO. An SAE of 0.092 is applicable for the following dose-related exposures: The calculated dose was 69399.6 ppm CO-minutes. The effective half-life of CO after exposure was 263 minutes. The calculation assumed 21.0% O2 during exposure. 21.0% O2 after exposure. (b) Block House: On or about October 13, 2020 feasible engineering controls including, but not limited to, operation of all exhaust fans in the work area were not implemented to reduce employee exposures to carbon monoxide. An employee (Block Machine Operator) was exposed to carbon monoxide (CO) at a mean calculated 672.9 ppm CO level (SAE = 0.141). The %COHb in the employee's blood reached a calculated peak level of 24.9%. Atmospheric pressure, height, weight, activity levels, tobacco smoking behavior, and other factors were taken into account. The 8-hour TWA exposure was 84.1 ppm CO ( SAE = 0.118), which is 1.68 times the OSHA PEL of 50 ppm CO. An SAE of 0.118 is applicable for the following dose-related exposures: The calculated dose was 40376.5 ppm CO-minutes. The effective half-life of CO after exposure was 308 minutes. The calculation assumed 21.0% O2 during exposure. 21.0% O2 after exposure. (c) Block House: On or about October 13, 2020 feasible engineering controls including, but not limited to, operation of all exhaust fans in the work area were not implemented to reduce employee exposures to carbon monoxide. An employee (Maintenance Assistant) was exposed to carbon monoxide (CO) at a mean calculated 361.1 ppm CO level (SAE = 0.097). The %COHb in the employee's blood reached a calculated peak level of 26.0%. Atmospheric pressure, height, weight, activity levels, tobacco smoking behavior, and other factors were taken into account. The 8-hour TWA exposure was 90.3 ppm CO ( SAE = 0.095), which is 1.81 times the OSHA PEL of 50 ppm CO. An SAE of 0.095 is applicable for the following dose-related exposures: The calculated dose was 43331.7 ppm CO-minutes. The effective half-life of CO after exposure was 308 minutes. The calculation assumed 21.0% O2 during exposure, 21.0% O2 after exposure, and 24 % O2 for the 10 minutes just prior to sampling. (d) Block House: On or about October 13, 2020 feasible engineering controls including, but not limited to, operation of all exhaust fans in the work area were not implemented to reduce employee exposures to carbon monoxide. An employee (Maintenance Technician) was exposed to carbon monoxide (CO) at a mean calculated 651.2 ppm CO level (SAE = 0.137). The %COHb in the employee's blood reached a calculated peak level of 21.2%. Atmospheric pressure, height, weight, activity levels, tobacco smoking behavior, and other factors were taken into account. The 8-hour TWA exposure was 81.4 ppm CO ( SAE = 0.106), which is 1.63 times the OSHA PEL of 50 ppm CO. An SAE of 0.106 is applicable for the following dose-related exposures: The calculated dose was 39070.6 ppm CO-minutes. The effective half-life of CO after exposure was 352 minutes. The calculation assumed 21.0% O2 during exposure, 21.0% O2 after exposure, and 24 % O2 for the 10 minutes just prior to sampling.