elevation of the receptor is sufficiently far above the

calculated plume height. Under conditions of steadily rising

terrain, the air flow, and plumes imbedded in that flow, will

tend to follow the terrain and become well mixed after a

distance of 50 km. Therefore, the various simple terrain

models, outlined in the Guideline, should generally provide a

reasonable approximation of transport and dispersion under

these conditions.

The results of the Level I technique will be analyzed

somewhat differently for increment and NAAQS analyses than for

visibility and other AQRV analyses. The methods for performing

these first level long range transport analyses are discussed

below.

5.1.1 Level I Long Range Transport Techniques for Analyzing

Increment and NAAQS

If Level I methods are to be utilized for increment and

NAAQS analysis, then all sources, whether closer or farther

than 50 km should be analyzed assuming no conversion of SO to 2

SO and NO to NO and no deposition. If that analysis = 

4 X 3

indicates that the increments or NAAQS are being exceeded, then

a full analysis, using the recommended long range transport

model in combination with the steady-state Gaussian model, as

described below, should be employed.

5.1.2 Level I Analysis Technique for Evaluating the Effects

of Long Range Transport and Regional Visibility

If a Level I approach is desired, it should be assumed

that all SO has been converted to SO and that all NO has been 2 4 X

=

converted to NO in the analysis. Refer to Inset 1 for the 

3

appropriate method for converting SO and NO to SO and NO .

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