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 •TWA 8 of 1 ppm Are above the TWA 8 ; 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 TWA 8 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 TWA 8 , 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. 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 •TWA 8 of 1 ppm Are above the TWA 8 ; 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 TWA 8 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 TWA 8 , 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.