2.2. Good Engineering Practice (GEP) stack height

34

35 Consistent with previous modeling guidance and Section 6.2.2 of Appendix W, for stacks

36 with heights that are within the limits of Good Engineering Practice (GEP), actual heights should

37 be used in modeling. Under the EPA’s regulations at 40 CFR 51.100, GEP height, Hg, is

38 determined to be the greater of:

39 65 m, measured from the ground-level elevation at the base of the stack;

40 for stacks in existence on January 12, 1979, and for which the owner or operator had

41 obtained all applicable permits or approvals required under 40 CFR Parts 51 and 52

42

43 Hg=2.5H

44

45 provided the owner or operator produces evidence that this equation was actually relied

on in designing the stack or establishing an emission l 1 imitation to ensure protection

2 against downwash;

3 for all other stacks,

4

5 Hg=H + 1.5L,

6

7 where H is the height of the nearby structure(s) measured from the ground-level elevation

8 at the base of the stack and L is the lesser dimension of height or projected width of

9 nearby structure(s); or

10 the height demonstrated by a fluid model or a field study approved by the EPA or the

11 state/local permitting agency which ensures that the emissions from a stack do not result

12 in excessive concentrations of any air pollutant as a result of atmospheric downwash,

13 wakes, eddy effects created by the source itself, nearby structures or nearby terrain

14 features.

 

 

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