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WAC 296-855-30010

Periodic exposure monitoring.

Exemption:
Periodic employee exposure monitoring is not required if exposure monitoring results conducted to fulfill requirements in Exposure evaluation, WAC 296-855-20050, are below the action level (AL).
You must obtain employee exposure monitoring results according to the frequency specified in Table 2, Periodic Exposure Evaluation Frequencies.
Note:
• If you documented that one work shift consistently has higher exposure monitoring results than another for a particular operation, then you may limit sample collection to the work shift with higher exposures and use those results to represent all employees performing the operation on other shifts.
Table 2
Periodic Exposure Evaluation Frequencies
If employee exposure monitoring results:
Then:
Are between the:
Conduct additional exposure monitoring at least every 6 months.
• Action level (AL) of 0.5 parts per million (ppm);
AND
 
•TWA8 of 1 ppm
 
Are above the TWA8;
Conduct additional exposure monitoring at least every 3 months.
OR
Above the STEL
 
Have been obtained at least every 3 months;
You may decrease your evaluation frequency for the TWA8 to every 6 months.
AND
Have 2 consecutive monitoring results, taken at least 7 days apart, showing 8-hour employee exposure monitoring results that have dropped below the TWA8, but remain at or above the AL
 
Have 2 consecutive evaluations, taken at least 7 days apart, showing 8-hour employee exposure monitoring results that have dropped below the AL and STEL
You may stop periodic exposure evaluations.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 18-22-116, § 296-855-30010, filed 11/6/18, effective 12/7/18; WSR 05-17-168, § 296-855-30010, filed 8/23/05, effective 1/1/06.]
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