Section 325.51103. Exposure limits.

An employer shall ensure that an employee exposure  to  any substance listed in tables G-1-A or G-2 in R 325.51108 is limited in accordance with the requirements of all of the following provisions:

(a)     ) With respect to table G-1-A, all of the following provisions apply:

(i)     Removed (May 9, 2001).

(ii)     Removed (May 20, 2001).

(iii)       An employee's exposure to any substance listed in  table  G-1-A shall not exceed the time-weighted average (TWA) limit, short-term exposure limit (STEL) and ceiling limit specified for that substance in table G-1-A.

(iv)     To prevent or reduce skin absorption, an employee's skin exposure to substances listed in table G-1-A with an "X" in the skin designation column following the substance name shall be prevented or reduced to the extent necessary through the use of gloves, coveralls, goggles, or other appropriate personal protective equipment, engineering controls,  or  work practices.

(v)      An employee shall not be exposed to air concentrations between the TWA and STEL limits more than 4 times in a workshift and such exposures shall be no less than 60 minutes apart.

(b)     With respect to table G-2, all of the following provisions apply:

(i)      An employee's exposure to any substance listed in table G-2 in any 8-hour workshift of a 40-hour workweek  shall   not  exceed  the 8-hour, time-weighted average limit given for that substance in table G-2.

(ii)      An employee's exposure to a substance listed in table G-2  shall not exceed, at any time during  an  8-hour  workshift,  the   acceptable ceiling concentration limit given for the substance in the table, except for a period of time and up to a concentration that does not exceed the maximum duration and concentration allowed in the column under "Acceptable maximum peak above the ceiling concentration for an 8-hour workshift." For example, during an 8-hour workshift, an employee may be exposed to a concentration of substance A (with a 10 parts of the substance per million parts of air (ppm) TWA, 25 ppm ceiling and 50 ppm peak) above 25 ppm (but not above 50 ppm) only for a maximum period of 10 minutes. Such an  exposure  shall   be compensated for by exposures to concentrations less than 10 ppm  so   the cumulative   exposure  for the entire 8-hour  workshift  does  not  exceed  a time-weighted average of 10 ppm.

(iii)    If a substance is preceded by an "S", then an employer shall take the necessary precautions to prevent  an  employee   from    absorbing   the substance through his or her skin.

History: 1990 AACS; 2001 AACS.