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.

PDFWAC 296-849-12010

Periodic exposure evaluations.