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1. Using that portion of a stack which exceeds good engineering practice stack height; 2. Varying the rate of emission of a pollutant according to atmospheric conditions or ambient concentrations or that pollutant; or 3. Increasing final exhaust gas plume rise by manipulating source process
This section provides that the degree of emission limitation required of any source for control of any air pollutant must not be affected by that portion of any source's stack height that exceeds good engineering practice (GEP) or by any other dispersion technique, except as provided in Section 47.1.B of this rule.
The purpose of this regulation is to prevent the use of tall stacks or other dispersion techniques from affecting the emissions limitations required to meet National Air Quality Standards (NAAQS) or Prevention of Significant Deterioration (PSD) increments.
This guideline provides technical support for the definition and specification of GEP stack height as found in the stack height regulations for sources near building structures and for reasonable minimum stack heights. The remainder of this section contains applicable definitions of GEP stack height.
According to Environmental Protection Agency (EPA) regulations, GEP stack height is defined to be the tallest of the following: 65 meters (213 feet), as measured from the ground-level elevation at the base of the stack.
For tall buildings, where the width is less than the height, the stack height need only be equal to the height of the building plus 1.5 times it width. Thus, the good engineering practice stack height has been determined to be equal to the height of the structure plus 1.5 times the height or width, whichever is less.
C.“Good Engineering Practice” (GEP) Stack Height The greater of: 1. 65 meters, measured from the ground-level elevation at the base of the stack; 2. Hg = H + 1.5L, where: Hg = GEP stack height, measured from the ground-level elevation at the base of the stack
