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NOTICEThis document contains information of a preliminary nature. It is subject to revision or correction and therefore does not represent a final report.

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Work en the model evaluation proj'ect is continuing at this time. As this work proceeds, modification of the recommendations presented in this report may be made to reflect the latest ii'ndings of the project staff. L Xll 1. mathematically simple and flexible, 2. in accord with much, but not a'l, diffusion theory, and 3. a reliable framework for the correlation of both field studies and mathematical and physical modeling studies of atmospheric diffusion. 2.1.1.1 Dispersion parameters. It has been found that the dispersi parameters, s and s , need to be carefully specified when using the Gaussian plume model. ' A number of empirically determined graphs of s and s as a function of downwind distance and atmospheric stability 8 9 have been proposed. GeiB et al. have published a useful set of com parisons between some of these sets of graphs.

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