The department shall designate the time adjustment factors based on the following criteria:

1. (a) The time adjustment factor shall be 1.0 for RTAPs that:

   1. (1) Have an occupational exposure limit that is intended to primarily prevent irritation or discomfort; or
   2. (2) For which there are essentially no known cumulative effects resulting from extended exposures to such pollutants at concentration levels at or near the occupational exposure limit;
2. (b) The time adjustment factor shall be 2.0 for RTAPs that have an occupational exposure limit that is intended to prevent acute exposure effects;
3. (c) The time adjustment factor shall be 2.5 for RTAPs that have a ceiling limit value set as an occupational exposure limit that is not intended to be exceeded at any time; and

4. (d) The time adjustment factor shall be 2.8 for RTAPs that:

   1. (1) Have an occupational exposure limit that is set by technological feasibility or commonly recognized good hygiene practice;
   2. (2) Present cumulative health hazards and have an occupational exposure limit intended to prevent excessive accumulation in the body from extended periods of exposure; or
   3. (3) Present both acute and cumulative health hazards.

Source. #6468-B, eff 3-5-97; ss and moved by #8278, eff 2-4-05 (from Env-A 1409.02); ss by #9601, eff 11-25-09; ss by #12443, eff 1-5-18; ss by #13334, eff 2-3-22 (formerly Env-A 1408.02)