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WAC 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.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 18-22-116, § 296-849-12010, filed 11/6/18, effective 12/7/18; WSR 05-13-152, § 296-849-12010, filed 6/21/05, effective 8/1/05; WSR 05-01-172, § 296-849-12010, filed 12/21/04, effective 3/1/05.]
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