296-307-626  <<  296-307-62605 >>   296-307-62610

WAC 296-307-62605

Identify and evaluate respiratory hazards.

You must:
• Make sure employees are protected from potentially hazardous exposure while you perform your evaluation
• Perform your evaluation without considering the protection provided to employees by a respirator
• Determine the form of the hazard, such as dust, mist, gas, oxygen deficiency, or biological agent
• Make sure you consider:
– Potential emergency and rescue situations that may occur, such as equipment or power failures, uncontrolled chemical reactions, fire, explosion, or human error
– Workplace conditions such as work processes, types of material, control methods, work practices and environmental conditions.
• Determine or reasonably estimate whether any employee is or could be exposed to any of the following:
– Any airborne substance above a permissible exposure limit (PEL) listed in Table 3
– A substance at or above the action level (AL) specified in the rule for that substance
– Any other respiratory hazard.
• Use any of the following to determine employee exposure:
– Information that would allow an estimate of the level of employee exposure, such as MSDSs or pesticide labels, observations, measurements or calculations
– Data demonstrating that a particular product, material or activity cannot result in employee exposure at or above the AL or PEL
– Personal air samples that represent an employee's usual or worst case exposure for the entire shift.
Note:
• Rules for specific substances may contain additional requirements for determining employee exposure.
 
• Use methods of sampling and analysis that have been validated by the laboratory performing the analysis.
 
• Samples from a representative group of employees may be used for other employees performing the same work activities when the duration and level of exposure are similar.
You must:
• Consider the atmosphere to be immediately dangerous to life or health (IDLH) when you cannot determine or reasonably estimate employee exposure
• Make sure employee exposure, to 2 or more substances with additive health effects, is evaluated using this formula:
Em
=
C1
+
C2
+
...
+
Cn
L1
L2
Ln
The
symbol
Is the . . .
E
Equivalent exposure for the mixture. When the value of E is greater than 1, a respiratory hazard is present.
C
Concentration of a particular substance.
L
TWA, STEL, or ceiling for that substance from Table 3.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. WSR 05-01-166, § 296-307-62605, filed 12/21/04, effective 4/2/05.]
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