In these situations of close proximity between the source and receptors, a photochemical

14 grid model instrumented with sub-grid plume treatment and sampling may also appropriately

15 characterize these relationships. Sub-grid plume treatment extensions in photochemical grid

16 models typically solve for in-plume chemistry and use a set of physical and chemical criteria for

17 determination of when puff mass is merged back into the host model grid. In addition to tracking

18 puffs at sub-grid scale, the photochemical grid modeling systems must be able to track and

19 output surface layer sub-grid puff concentrations, i.e., “sub-grid plume sampling,” to best

20 represent receptor concentrations that are in close proximity to the source. Another inherent

21 issue related to sub-grid plume sampling that must be considered is that some of the source’s

22 impacts on air quality are resolved in puffs at the sub-grid scale and some impacts are only

23 resolved in the 3-dimensional grid space. Extracting just the sub-grid plume information or just


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