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LLNL Emergency Plan <br />Rev-22 <br />January 2017 <br /> <br /> 84 <br />8.1.2 Acute Exposure Guideline Levels (Chemical) <br />The Protective Action Criteria for chemical materials are listed by the temporary emergency <br />exposure limit (TEEL), and published and maintained on the DOE chemical safety website. <br />These values for airborne concentrations of released materials are based on requirements in the <br />Occupational Safety and Health Administration, EPA, and other exposure limits. Sixty-minute <br />final and interim acute exposure guideline levels (AEGL60s) – as a first choice, and emergency <br />response planning guidelines (ERPGs) developed by the American Industrial Hygiene <br />Association – as a second choice, have been incorporated into the TEEL list, where available. <br />The following three reference value levels are defined for each material as follows: <br /> AEGL60-1/ERPG-1/TEEL-1 is the maximum airborne concentration below which it is <br />believed that nearly all individuals could be exposed for up to one hour without <br />experiencing other than mild transient adverse health effects or perceiving a clearly <br />defined objectionable odor. <br /> AEGL60-2/ERPG-2/TEEL-2 is the maximum airborne concentration below which it is <br />believed that nearly all individuals could be exposed for up to one hour without <br />experiencing or developing irreversible or other serious health effects or symptoms that <br />could impair their abilities to take protective action. <br /> AEGL60-3/ERPG-3/TEEL-3 is the maximum airborne concentration below which it is <br />believed that nearly all individuals could be exposed for up to one hour without <br />experiencing or developing life-threatening health effects. This is considered the <br />threshold for early lethality for chemical releases. <br />AEGL60-2, ERPG-2, or TEEL-2 is used for the classification of emergency events and the <br />initiation of protective actions at LLNL. <br />Postulated chemical release scenarios are also described in the EPHAs. <br />8.2 Protective Action Implementation <br />8.2.1 Objective <br />The primary objective of protective actions is to limit individual doses or exposures. In the short- <br />term, this may be accomplished by taking action (e.g., shelter-in-place) to keep exposure levels <br />below the thresholds for severe early health effects. In the longer term, additional actions may be <br />required to reduce or avoid additional exposure (e.g., evacuate populations), which may cause <br />temporary exposure to a higher plume concentrations than would occur during shelter-in-place, <br />for the purpose of avoiding a higher dose over an extended period of time, thereby producing a <br />positive net benefit. The overall risk to workers and the public should be limited, to the extent <br />practicable, by reducing the population or collective dose (or exposure). Protective actions, when <br />implemented individually or in combination, accomplish this objective.