In order to assess the impact of implementing the Phase 1 recommendations, and ultimately to

improve the Phase 1 modeling system, the following tasks were carried out:

• The MESOPUFF II model and associated processors were tested using the

example problem intended for Support Center for Regulatory Air Models bulletin

board (SCRAM BBS) distribution.

• The SCRAM BBS example problem computer files were evaluated and some

suggested improvements were implemented.

• A five-year meteorological data set suitable for input to the MESOPUFF II model

was developed for a multi-state area surrounding Shenandoah National Park.

• A modeling protocol was developed that outlined the approach and procedures to

be followed in the MESOPUFF II demonstration modeling assessments.

• Demonstration model simulations were performed for the assessment of visibility,

acidic deposition, and PSD increments for a set of real sources in the states

surrounding Shenandoah National Park.

• Model simulations were performed to test the sensitivity of concentrations to the

distance between sources and receptors using a set of "pseudo" sources placed in

successive rings around Shenandoah National Park.

• An assessment report was developed (this report), documenting the modeling

process, and the results obtained.

Throughout the project, there has been coordination with IWAQM members and coworkers

regarding implementation of the Phase 1 recommendations for assessing visibility and acidic

deposition impacts in Federal Class I land associated with the Shenandoah National Park.

IWAQM members representing FLMs (National Park Service, NPS; and National Forest

Service, NFS), have provided assistance in modeling protocol related to the determination of

visibility and acid deposition in Class I areas. The Virginia Department of Environmental

Quality (VDEQ) and the EPA Region III office provided assistance and guidance regarding

receptor locations, emission source data collection, and PSD source selection. The Office of

Air Quality Planning and Standards (OAQPS) provided direct oversight of the project. The

IWAQM members who participated in this study are listed in Appendix A.

This report documents the procedures followed to demonstrate the implementation of the

Phase 1 recommendations for assessing the PSD and AQRV impacts at Class I area land

associated with Shenandoah National Park. Section 2 describes the testing of the SCRAM

BBS example problem and the improvements made to those files. Section 3 describes the

development and application of the MESOPUFF II modeling system for assessing the impacts



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