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February 28, 1989 Guidance on Determining Lowest Achievable Emission Rate (LAER)26.8(a) Little weight is given to economics in LAER determinations. Cost of a control could be considered not achievable only if no new plants could be built in that industry if emission limits were based on levels achievable only with the contemplated control technology.
(b) LAER for coating operations may mean low (or no) VOC solvent coatings, high transfer efficiencies, add-on control device on the gas stream, or some combination of these.
(c) The most stringent emissions limit contained in a SIP for a class or category of source must be considered LAER unless a more stringent emissions limitation has been achieved in practice, or unless the SIP limitation is demonstrated to be unachievable by the source.
(d) Careful case-by-case investigations must be made to determine how company-mandated product specifications (for coatings) would be used in determining LAER, and