24 Before running AERMOD, the user should become familiar with the user’s guides associated

25 with the modeling components listed above and the AERMOD Implementation Guide (AIG)

26 (U.S. EPA, 2009). The AIG lists several recommendations for applications of AERMOD that

27 would be applicable for SIP and PSD permit modeling.

28

29 1.2. Receptor grid

30

31 The model receptor grid is unique to the particular situation and depends on the size of

32 the modeling domain, the number of modeled sources, and complexity of the terrain. Receptors

33 should be placed in areas that are considered ambient air (i.e., where the public generally has

34 access) and placed out to a distance such that areas of violation can be detected from the model

35 output to help determine the size of nonattainment areas. Receptor placement should be of

36 sufficient density to provide resolution needed to detect significant gradients in the

37 concentrations with receptors placed closer together near the source to detect local gradients and

38 placed farther apart away from the source. In addition, the user should place receptors at key

39 locations such as around facility fence lines (which define the ambient air boundary for a

40 particular source) or monitor locations (for comparison to monitored concentrations for model

41 evaluation purposes). The receptor network should cover the modeling domain. States may

42 already have existing receptor placement strategies in place for regulatory dispersion modeling

43 under NSR/PSD permit programs.

 

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