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Show and subcategories with 30 sources or more. (B) The average emission limitation achieved by the best performing 5 sources (for which the Administrator has or could reasonably obtain emissions information) in the category or subcategories with fewer than 30 sources. (4) Health Threshold - With respect to pollutants for which a health threshold has been established, the Administrator may consider such threshold level with an ample margin of safety, when establishing emission standards under this subsection. (5) Alternative Standard for Area Sources - With respect only to categories and subcategories of area sources listed pursuant to subsection ( c ), the Administrator may, in lieu of the authorities provided in paragraph (2) and subsection (f), elect to promulgate standards or requirements applicable to sources in such categories or subcategories which provide for the use of generally available control technologies or management practices by such sources to reduce emissions of hazardous air pollutants." Emission standards that are more stringent than the floor must take into account economic and other impacts. New Sources- " The maximum degree of reduction in emissions that is deemed achievable for new sources in a category or subcategory shall not be less stringent than the emission control that is achieved by the best controlled similar source, as determined by the administrator." ACCOMPLISHMENTS The accomplishments of the boiler work group are listed in Table 2. Accomplishments have been divided into Closure, Works in Progress, and Data. The Coordinating Committee formally passed these B W G products to the United States Environmental Protection Agency (EPA) for its consideration as it completes the rulemaking for boilers. The distinction between categories is of critical importance as follows: • Closure items carry great weight in the rulemaking process because these items have the backing of a Federal Advisory Committee (which includes E P A personnel). Closure items have areas of consensus and point out areas of disagreement. The rationale and supporting data behind a closure item is fully developed. The areas of consensus carry the greatest weight. In areas of disagreement the E P A has a greater latitude to assess the differing opinions and choose its o w n course of action. • Works in Progress carry only the same weight as an individual stakeholder's input to the regulatory process. These contain useful information that the E P A may consider and use in the rulemaking process. By its nature, a work in progress is incomplete and often lacks the consensus of one or more stakeholder groups. D:\jps\iccr\bwg\boilerwg 5 |