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.

PDFWAC 296-855-30010

Periodic exposure monitoring.