hordruma/ontario_laws_and_regs huggingface dataset:
17. For the purposes of this Regulation, the methods and procedures that may be used or adopted may vary from the Codes issued by the Ministry if the protection afforded thereby or the factors of accuracy and precision used or adopted are equal to or exceed the protection or the factors of accuracy and precision in the Codes issued by the Ministry. R.R.O. 1990, Reg. 843, s. 17. SCHEDULE The time-weighted average exposure of a worker to airborne lead shall be calculated for a forty-hour week and an eight-hour day as follows: 1. The average concentrations of lead to which a worker is exposed shall be determined from analyses of air samples representative of the exposure of the worker to lead during work operations in accordance with standard methods for workplace air sampling and analysis. 2. The results of the analyses are the concentrations expressed as elemental lead in milligrams per cubic metre of air. 3. The concentrations shall be multiplied by the time in hours to which the worker is taken to be exposed to such concentrations. 4. The weekly exposure shall be calculated as follows: C1T1 + C2T2 +...+ CnTn = cumulative weekly exposure where, C1 is the concentration found in an air sample, and T1 is the total time in hours to which the worker is taken to be exposed to concentration C1 in a week. 5. The weekly time-weighted average exposure shall be calculated by dividing the cumulative weekly exposure by 40. 6. The daily exposure shall be calculated as follows: C1T1 + C2T2 +...+ CnTn = cumulative daily exposure where, C1 is the concentration found in an air sample, and T1 is the total time in hours to which the worker is taken to be exposed to concentration C1 in a day. 7. The daily time-weighted average exposure shall be calculated by dividing the cumulative daily exposure by 8. R.R.O. 1990, Reg. 843, Sched; O. Reg. 389/00, s. 5. Français