As used in this part, all terms not defined herein will have the meaning given them in the Act:
Hg = 2.5H,
provided the owner or operator produces evidence that this equation was actually relied on in establishing an emission limitation:
Hg = H + 1.5L
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, height or projected width, of nearby structure(s)
provided that the EPA, State or local control agency may require the use of a field study or fluid model to verify GEP stack height for the source; or
40 C.F.R. §51.100
For FEDERAL REGISTER citations affecting § 51.100 , see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.