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ATTACHMENT B <br /> OCCUPATIONAL HEALTH GUIDELINES <br /> AND TOXICOLOGICAL INFORMATION <br /> DEFINITIONS <br /> Threshold Limit Value: Threshold limit values (TLVs) refer to airborne concentrations of <br /> substances and represent conditions under which it is believed nearly all workers may be <br /> repeatedly exposed, day after day, without adverse health effects. <br /> Threshold Limit Value- Time Weighted Average: The time weighted average (TWA) is a <br /> concentration for a normal 8-hour workday and a 40-hour workweek, to which nearly all workers <br /> may be repeatedly exposed, day after day, without adverse effect. TLV-TWAs are established by <br /> the ACGIH. <br /> Recommended Exposure Limit: Unless otherwise noted, the recommended exposure limit <br /> (REL) is a TWA concentration for up to a 10-hour workday during a 40-hour workweek. RELs <br /> are established by NIOSH to reduce or eliminate adverse occupational health effects. <br /> Short Term Exposure Limit: A short term exposure limit (STEL) is defined as a 15-minute <br /> TWA exposure that should not be exceeded at any time during a workday. When compared to <br /> the REL (or TLV-TWA for ACGIH standards), the STEL allows the worker to be exposed to a <br /> higher concentration, BUT for a shorter period of time. Exposures above the REL up to the <br /> STEL should not be longer than 15 minutes and should not occur more than four times per day. <br /> Permissible Exposure Limit: Permissible exposure limits (PELs) are TWA concentrations that <br /> must not be exceeded during any 8-hour work shift of a 40-hour workweek. PELs are established <br /> by OSHA(29 CFR 1910.1000). <br /> Immediately Dangerous to Life and Health: Immediately dangerous to life and health(IDLH) <br /> values are established as concentrations from which a worker can escape within 30 minutes <br />