NAC445B.083. “Good engineering practice stack height” defined.

     1. “Good engineering practice stack height” means the stack height that is the greater of:

     (a) Two hundred thirteen feet, measured from the ground-level elevation at the base of the stack;

     (b) A height determined as follows:

          (1) For stacks that commenced construction on or before January 12, 1979, and for which the owner or operator had obtained all applicable permits or approvals required pursuant to 40 C.F.R. Parts 51 and 52 and NAC 445B.001 to 445B.3689, inclusive, the height determined by use of the equation H_g = 2.5H, so long as the owner or operator produces evidence that this equation was actually relied on in establishing an emission limitation; and

          (2) For all other stacks, the height determined by use of the equation H_g = H + 1.5L,

Ê except that the Director may require the use of a field study or fluid model to verify good engineering practice stack height for the source; or

     (c) The height demonstrated by a fluid model or a field study approved by the Director, which ensures that the emissions from a stack do not result in excessive concentrations of any air pollutant as a result of atmospheric downwash, wakes or eddy effects created by the source itself, nearby structures or nearby terrain features.

     2. For the purposes of this section:

     H_g =   good engineering practice stack height, measured from the ground-level elevation at the base of the stack;

     H  =   height of nearby structures measured from the ground-level elevation at the base of the stack; and

     L  =   lesser dimension, height or projected width, of nearby structures.

     (Added to NAC by Environmental Comm’n by R096-05, eff. 10-31-2005)