PDFWAC 296-849-12010
Periodic exposure evaluations.
Exemption: | Periodic exposure evaluations aren't required if exposure monitoring results conducted to fulfill requirements in Exposure evaluation, WAC 296-849-11030, are below the action level (AL) and short-term exposure limit (STEL). |
You must obtain employee exposure monitoring results as specified in Table 3, by repeating Steps 3, 4, 6, and 7 of the exposure evaluation process found within this chapter, in Exposure evaluations, WAC 296-849-11030.
Note: | If you document that one work shift consistently has higher exposure monitoring results than another for a particular operation, then you can limit sample collection to the work shift with higher exposures and use results to represent all employees performing the operation on other shifts. |
Table 3
Periodic Exposure Evaluation Frequencies
If exposure monitoring results | Then | |
– – | Are between the: AL of 0.5 ppm AND Eight-hour time-weighted average (TWA8) of 1 ppm | Conduct additional exposure evaluations at least every twelve months for the employees represented by the monitoring results. |
Are above the TWA8 | Conduct additional exposure evaluations at least every six months for the employees represented by the monitoring results. | |
Have decreased to a concentration between the AL and TWA8; | You may decrease your evaluation frequency to every twelve months for employees represented by the monitoring results. | |
AND | ||
The decrease is demonstrated by two consecutive exposure evaluations, made at least seven days apart. | ||
Are above the short-term exposure limit (STEL) of 5 ppm | Repeat as often as necessary to evaluate employee exposure. | |
Have decreased to below the AL and the STEL | You may stop periodic exposure evaluations for employees represented by the monitoring results. | |
AND | ||
The decrease is demonstrated by two consecutive evaluations, made at least seven days apart. | ||