§ 57.502 Evaluation.

(a) Evaluation at the time of application. Any smelter owner may demonstrate at the time of application for an NSO that the smelter's SO₂ fugitive emissions will not cause or significant contribute to violations of the NAAQS in the smelter's DLA. If such demonstration is not made, the smelter owner shall submit the design and workplan for a study adequate to assess the sources of significant fugitive emissions from the smelter and their effects upon ambient air quality.