Reasonable Worst Case 1
Reasonable Worst Case 1 : Disaster Management. (a) Reasonable unfavourable but not unrealistic situation: covering normal use patterns, including cases where populations are exposed to the same substance in more than one scenario, e.g. consumers or workers may use several products containing the same substance. The reasonable worst case prediction should also consider upper estimates of the extreme use and reasonably foreseeable misuse. [EC, 1996: Risk Assessment for New Notified Subs]; (b) The lower portion of the "high end" of the exposure, dose, or risk distribution. The reasonable worst case conceptually should be targeted at or above the 90th percentile in the distribution, but below the 98th percentile. [REAP, 1995: Residential Exposure Assessment Project]; (c) A semiquantitative term referring to the lower portion of the high end of the exposure, dose, or risk distribution. The reasonable worst case has historically been loosely defined, including synonymously with maximum exposure or worst case, and assessors are cautioned to look for contextual definitions when encountering this term in the literature. As a semiquantitative term, it is sometimes useful to refer to individual exposures, doses, or risks that, while in the high end of the distribution, are not in the extreme tail. For consistency, it should refer to a range that can conceptually be described as above the 90th percentile in the distribution, but below about the 98th percentile. (compare maximum exposure range, worst case). [USEPA, 1992: GL for Exposure Assessment]; (d) An estimate of the individual dose, exposure, or risk level received by an individual in a defined population that is greater than the 90th percentile but less than that received by anyone in the 98th percentile in the same population. Reasonably Available Control Technology (RACT): Control technology that is reasonably available, and both technologically and economically feasible. Usually applied to existing sources in nonattainment areas; in most cases is less stringent than new source performance standards. Reasonably Available Control Measures (RACM): A broadly defined term referring to technological and other measures for pollution control. [USEPA, 1997a: EPA Terms of Environment]
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