major and minor sources) to be applied for PSD impact analysis, determination of AQRV

impacts, and the associated inventories needed for each analysis is presented in Appendix B

(Cimorelli 1993).

Therefore, the actual number of sources to be modeled in the demonstration study was not

specified in the modeling protocol. This caveat was also based upon recognition that the CPU

time needed to run the model increases with the number of sources, and can become an

important factor in the decision of number of sources to model. As originally configured,

MESOPUFF II could treat up to 1000 point sources. Although MESOPUFF II can also be

used for area sources, no area sources were to be modeled in this study. It is important to note

that when multiple sources are included, only the cumulative effect is modeled -- individual

source attribution is not possible.

For each source, the model requires location, stack parameters (height, diameter, temperature,

flow rate), and emission rates of SO , sulfate, and NO . If primary non-sulfate aerosol is to be 2 x

modeled, two MESOPUFF II simulations are needed, with the primary aerosol labeled

"sulfate" in the second simulation. Primary non-sulfate aerosol was not to be modeled in the

present study, as available resources did not allow for two sets of simulations, and since it was

expected that the majority of visibility impacts due to PSD sources was to be captured by

examining only sulfate and nitrate effects.

The Phase 1 recommendations state that, for sources within 50 km, MESOPUFF II should not

be used to estimate PSD impacts but can be used to estimate visibility and deposition impacts.

This means that in a situation where sources both closer and further than 50 km are to be

modeled, two MESOPUFF II simulations would be needed, one with and one without sources

within 50 km. In order to avoid the need for two model runs, it was decided that sources

within 50 km of the park would not be modeled with MESOPUFF II in the demonstration

study, but one or two would be modeled with ISCST2, in order to demonstrate the integration

of MESOPUFF II and ISCST2 results. We planned to follow the Phase 1 recommendations

concerning application of ISCST2.

Subsequent to the development of the modeling protocol, the decision was made to conduct a

parallel set of MESOPUFF II analyses using uniform idealized sources placed in rings at

various distances from SNP. The ring source analysis is described in Section 4. The

remainder of this section is devoted to the PSD source analyses.

Processing of PSD Source Data

For the demonstration application, source data were received from the states of Pennsylvania,

Maryland, and Virginia. The data provided by Virginia also included some sources that are in

the states of Maryland and West Virginia, but are traditionally included in Virginia PSD

analyses. Therefore, some duplicate information was obtained for the state of Maryland. In

processing these data for input to MESOPUFF II, the following operations were carried out:

1. Sources within 50 km of any SNP receptor were identified and removed. There were

seven such sources, all in the state of Virginia.

 

 

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