were selected to cover all boundaries of the park. In total, 55 of the 200 receptors were

selected for modeling.

Figure 3-2(c) shows the array of receptors for JRFW, and identifies those selected as

MESOPUFF II receptors (again denoted as circles). This is a much smaller region than SNP,

extending less than 10 km in each direction. Nine of the 67 receptors were selected for use in


Once receptors for the Class I areas were selected, however, no additional outside receptors

were specified. Reduction in the number of PSD sources to be modeled, and consequent

movement of resulting aggregated sources to average locations (to be discussed below),

clouded the importance of monitoring concentrations between sources and receptors. When

we considered the uncertain benefits from such an analysis, we found it difficult to justify the

additional output and complications to postprocessing.


Selection of Sources: Issues and Protocol

MESOPUFF II can be used to simulate impacts from existing sources, proposed sources, or

hypothetical sources. For the demonstration study, the IWAQM decided that existing sources

that began operations since the beginning of the PSD program would be modeled. The

IWAQM felt that this would provide a good foundation for future modeling in the area. In

addition, since the PSD increments are expressed as the cumulative impact of all changes in

emissions, it was of interest to assess how much of the available Class I PSD increments have

already been "consumed" to date.

The IWAQM agreed to limit the sources to be modeled in the present study to those within

EPA Region III, comprising the states of Delaware, Maryland, Pennsylvania, Virginia and

West Virginia, and the District of Columbia. This decision was based upon practical

considerations such as ease of communications between affected states. The IWAQM

recognized from the outset that sources outside EPA Region III (located at distances further

than 200 km from SNP, such as those in Ohio) also have the potential to impact air quality

and deposition in SNP, and that therefore this demonstration application would not provide a

complete answer of the impact of existing sources. For that reason, the meteorological

modeling domain was specified to be large enough to encompass these sources and transport

corridors. Sources located within EPA Region III and at a distance of between 50 km and 200

km from SNP became the focus of this study.

It was proposed that all PSD sources or a subset of sources would be modeled, depending

upon the number of such sources and data availability. The identification of existing PSD

sources includes the determination of a baseline date, i.e., the date after which any new

construction or modification of existing sources will be considered as part of the accumulative

PSD impact. A discussion of the issues involved in determining the various baseline dates




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