R 336.2812 Air quality models.

Rule 1812. (1) All applications of air quality modeling involved in R 336.2801 to R 336.2819, R 336.2823, and R 336.2830 shall use the methods specified in R 336.1240. (2) If an air quality model specified in R 336.1240 is inappropriate, then the model may only be modified or another model substituted with the written approval of the United States environmental protection agency. In addition, use of a modified or substituted model shall be subject to the notice and opportunity for public comment in R 336.2817.