of regional point sources on Shenandoah National Park. Section 4 describes the analysis

performed to assess the relationship between distance of a source and impact at a receptor in

the park. The study results are summarized in Section 5, including a discussion of what was

learned during the modeling process.

The technical approach for this study is described briefly below:

Testing of the Example Problem

The MESOPUFF II software and documentation were retrieved from the SCRAM BBS,

installed on a PC, and run for the example problem. The model output was compared with the

sample output provided to ensure that the model was running properly on our system. Errors

and/or omissions in the model documentation were identified.

A set of recommended improvements for the MESOPUFF II system and example problem

were developed. The recommended improvements considered input files, documentation and

user instructions, and modifications to the MESOPUFF II code. The recommended

improvements were implemented and a revised version of the MESOPUFF II PC files were

placed on the SCRAM BBS.

Demonstration Application of MESOPUFF II to Shenandoah National Park

MESOPUFF II was applied to the estimation of PSD and AQRV impacts at Shenandoah

National Park as a demonstration of implementing the IWAQM interim (Phase 1)

recommendations. The necessary data were collected and processed, including

meteorological, emissions, receptor, and land use data. Data processing procedures were

developed to prepare model inputs and for postprocessing of model output. The process

involved in implementing the IWAQM Phase 1 recommendations was documented, including

the identification and resolution of key modeling issues and the resources used to complete the

application. The products of this application were: (1) an assessment of the experience in

performing the modeling exercise, including suggestions for improving the Phase 1

recommendations, (2) a demonstration assessment of the impacts at Shenandoah National

Park for a set of PSD sources surrounding the park, and (3) a five-year meteorological data

set, to be made available for distribution.

Application of MESOPUFF II for Distance versus Impact Analysis

In addition to the application intended to demonstrate the use of MESOPUFF II to assess the

impacts of real PSD sources on Shenandoah National Park, a second analysis was performed

to provide some indication of the relationship between distance of a source and impact at a

receptor in the park. MESOPUFF II was applied to assess the impacts of sources placed on

rings at specific distances from Shenandoah National Park.



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