Mich. Admin. Code R. 325.51102 - Definitions
Rule 2.
(1)
"Ceiling" means the employee's exposure that shall not be exceeded during any
part of the workday. If instantaneous monitoring is not feasible, then the
ceiling shall be assessed as a 15-minute, time-weighted average exposure that
shall not be exceeded during any part of the working day.
(2) "Skin designation" means those substances
so indicated that have toxic effects due to absorption through an employee's
skin.
(3) "Short-term exposure
limit (STEL)" means the employee's 15-minute, time-weighted average exposure
that shall not be exceeded at any time during a workday, unless another time
limit is specified in a parenthetical notation below the limit. If another time
period is specified, then the time-weighted average exposure over that time
limit shall not be exceeded at any time during the workday.
(4) "Time-weighted average (TWA)" means the
employee's average airborne exposure in any 8-hour workshift of a 40-hour
workweek that shall not be exceeded.
(5) The terms "substance" and "air
contaminant" are equivalent in meaning for purposes of these rules.
Notes
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