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(1) This chapter provides that the degree of emission limitation required of any source 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 (a) and (b) of paragraph (2) 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.
The guidance provided in Equation 1 is based on these generalized findings Hg = H + 1.5L (Equation 1) where: Hg = good engineering practice stack height, measured from the ground-level elevation at the base of the stack, H = height of nearby structure(s) measured from the ground- level elevation at the base of the stack, L = lesser dimension ...
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
This document provides guidance on determining good engineering practice (GEP) stack height in accordance with the EPA's stack height regulations. It outlines the technical basis for the GEP stack height equation, including how building and terrain features can influence emissions.
This paper provides detailed information on determining GEP stack height, outlines the wind tunnel modeling method required to demonstrate a GEP stack height taller than the EPA formula height and provides detailed results documenting that a 90 m stack height is creditable as GEP which is well above the 75 m EPA formula height.
