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Aermod implementation guide

AERMOD Implementation Guide C CEPA- B- - June AERMOD Implementation Guide U S Environmental Protection Agency O ?ce of Air Quality Planning and Standards Air Quality Assessment Division Research Triangle Park NC CPreface This document provides information on the recommended use of AERMOD to address speci ?c issues and concerns related to the implementation of AERMOD for regulatory applications The following recommendations augment the use of experience and judgment in the proper application of dispersion models Advanced coordination with reviewing authorities including the development of modeling protocols is recommended for regulatory applications of AERMOD ii Ciii CContents Section Page What ? s new in this document Document background and purpose Background Purpose Meteorological data and processing Determining surface characteristics Meteorological data representativeness considerations Methods for determining surface characteristics Use of AERSURFACE for determining surface characteristics Selecting upper air sounding levels Processing site-speci ?c meteorological data for urban applications Use of prognostic meteorological model data as inputs to AERMOD Terrain data and processing Modeling sources with terrain-following plumes in sloping terrain AERMAP DEM array and domain boundary Terrain elevation data sources for AERMAP Manually entering terrain elevations in AERMAP Use of AERMAP to determine source elevations Urban applications Urban rural determination Selecting population data for AERMOD ? s urban mode Optional urban roughness length ?? URBANOPT keyword Meteorological data selections for urban applications Urban applications using NWS meteorological data Urban applications using site-speci ?c meteorological data Source characterization Capped and horizontal stacks Use of area source algorithm in AERMOD REFERENCES Appendix A EPA Model Clearinghouse memorandum dated July iv CAERMOD Implementation Guide June What ? s new in this document Revisions dated April ? Section Urban rural determination ?? update for tall stacks in urban setting ? Section Selecting population data for AERMOD ? s urban mode ?? updated for clarity on determining urban population ? Section Interim Guidance on Model Applications ?? removed code corrections applied in version Note For version and subsequent versions refer to the document AERMOD System Bugs Errata and Related Guidance available on the EPA Support Center for Regulatory Atmospheric Modeling SCRAM website for supplemental guidance on program bugs issues that that are reported between version releases Document background and purpose Background In April the AERMOD Implementation Workgroup AIWG was formed in anticipation of AERMOD ? s promulgation as a replacement for the Industrial Source Complex ISCST model AERMOD fully replaced ISCST as the regulatory model on December EPA a after a one-year grandfather period The primary purpose for forming the AIWG was to develop a comprehensive approach for dealing with implementation issues for which guidance is needed A result of this initial AIWG was the publication of the ?rst version of the AERMOD Implementation Guide on September In a new AIWG was formed as a standing workgroup to provide support to EPA ? s O ?ce of Air Quality Planning and Standards OAQPS This document represents the combined e ?orts of AIWG and OAQPS in relation to the implementation of the AERMOD regulatory model Purpose