Subject to BART  Late 2005,WY District Engineers identified BART Eligible Sources using the July 6 th Guidelines (250 TPY, constructed in the '63-'77 window & one of the 26 listed source categories)  WY conducted CALPUFF modeling to determine whether sources contribute 0.5 dV of visibility impairment to the nearest Class I area 24 hr average actual emission rate/highest emitting day  Sources that contribute are Subject to BART
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