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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.
To avoid natural atmospheric effects which may cause excessive concentrations around very low level sources, a stack height of 65 meters is defined as good engineering practice, without demonstration of necessity for any source (see Section 2.5).
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 guideline provides technical support for the definitions and specifications of GEP stack height as found in the stack height regulation.
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.
