The employer shall assure that no employee is exposed to an airborne concentration of MDA in excess of ten parts per billion (10 ppb) as an 8-hour time-weighted average or a STEL of 100 ppb.
[Statutory Authority: Chapter 49.17 RCW. 93-04-111 (Order 92-15), ยง 296-62-07605, filed 2/3/93, effective 3/15/93.]