Washington Administrative Code
Title 296 - Labor and Industries, Department of
Chapter 296-849 - Benzene
Section 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;
AND The decrease is demonstrated by two consecutive exposure evaluations, made at least seven days apart. |
You may decrease your evaluation frequency to every twelve months for employees represented by the monitoring results. |
| 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
AND The decrease is demonstrated by two consecutive evaluations, made at least seven days apart. |
You may stop periodic exposure evaluations for employees represented by the monitoring results. |
Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 05-13-152, § 296-849-12010, filed 6/21/05, effective 8/1/05; 05-01-172, § 296-849-12010, filed 12/21/04, effective 3/1/05.
