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BOS 3640 Unit IV Assessment

BOS 3640 Unit IV Assessment

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The OSHA regulation at 29 C.F.R. §1910.1000(d) requires employers to determine the cumulative exposure of workers to certain gases over an 8-hr work shift using the following formula:
E = CaTa + CbTb + .... + CnTn                      8
E is the equivalent exposure for the work shift, C is the concentration during any period of time in which the concentration remains constant, and T is the duration of time in hours of the exposure.The regulation further stipulates that no employee can be further exposed to the gas when the value of E exceeds the 8-hr time-weighted average limit set for the given substance. If a worker is exposed to ammonia concentrations throughout the workday as follows, 125 ppm for 4 hr; 75 ppm for 2 hr; and 25 ppm for 2 hr, determine the equivalent exposure (E):
 
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