06-096-169 Me. Code R. § 6

Current through 2024-51, December 18, 2024

Section 096-169-6 - Stack Height Requirements

Any stack used to exhaust any generator engine or combination of generator engines, whether emergency or non-emergency, with a combined rated output equal to or greater than 1,000 brake horsepower (747 kilowatts) shall have a minimum height equal to the lesser of the heights in Sections (A) - (C) below; however, in no case shall the stack height be less than a height determined in accordance with Sections 4(B)(2)(d) or (e) as applicable:

A. 60% Good Engineering Practice (GEP) stack height. For the purposes of this chapter, GEP stack height is determined through use of the following formula:

Hg = H + 1.5L

where Hg = full GEP stack height

H = height of the overall controlling structure as measured from the ground-level elevation at the base of the stack L = the lesser dimension of height or projected width of the same structure.

All structures within 5L of the proposed stack shall be considered when determining the overall controlling structure.

NOTE: The owner or operator may refer to EPA's Building Profile Input Program (BPIP) and Guideline for Determination of Good Engineering Practice Stack Height (Technical Support Document For the Stack Height Regulations (EPA-450/4-80-023R, June 1985) for concepts and procedures for determining GEP stack height.

B. The height, as demonstrated by a qualitative ambient impact screening analysis and approved by the Department, that ensures that emissions from the stack, either alone or in conjunction with existing emissions from other sources, will not cause or contribute to violations of ambient air quality standards including, but not limited to, ambient increments as adopted by the Department pursuant to 38 M.R.S. § 584 . The analysis may take into account factors including, but not limited to, emission rates, stack height and location, height and configuration of nearby structures, proximity of sensitive receptors (e.g., schools, nursing homes, normally occupied building air intakes), terrain features, and operational limits. Acceptance of a qualitative ambient impact screening analysis is solely at the discretion of the Department.

C. The height, as demonstrated by ambient air quality dispersion modeling and approved by the Department, that ensures that emissions from the modeled stack, either alone or in conjunction with existing emissions from other sources, will not cause or contribute to violations of ambient air quality standards, including, but not limited to, ambient increments as adopted by the Department pursuant to 38 M.R.S. § 584 .

Individual generators with a maximum power capacity of less than 300 kilowatts shall not be included in the assessment of the combined power capacity of the generators exhausted by the stack.

NOTE: Copies of sections of the Code of Federal Regulations (C.F.R.) referenced in this Chapter can be accessed at https://ecfr.federalregister.gov and are also from the Department by calling (207) 287-7688.

06-096 C.M.R. ch. 169, § 6