Code of Maine Rules › 06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION › 096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL › Chapter 169 - STATIONARY GENERATORS › Section 096-169-6 - Stack Height Requirements

Current through 2024-29, July 17, 2024
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.
or
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.
or
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.