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AERMOD Implementation

AERMOD Implementation. Alan J. Cimorelli 8 th Conference on Air Quality Modeling Research Triangle Park, NC September 22-23, 2005. Outline. Approach to AERMOD Implementation Guidance Development Implementation Guide Model Improvements Summary. AERMOD Implementation Process.

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AERMOD Implementation

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  1. AERMOD Implementation Alan J. Cimorelli 8th Conference on Air Quality Modeling Research Triangle Park, NC September 22-23, 2005

  2. Outline • Approach to AERMOD Implementation • Guidance Development • Implementation Guide • Model Improvements • Summary

  3. AERMOD Implementation Process • NEED: As implementation proceeds issues will arise • PROCESS: • ISC or AERMOD for one year after promulgation • Provide Implementation Guide with promulgation • Model Clearinghouse Process • State contacts Region • Region writes memo to Clearinghouse • Clearinghouse memo back to Region • Archive memos / Annual report • As precedents and consensus builds, develop guidance • Model improvements

  4. Guidance Development • PURPOSE: Facilitate the scientifically appropriate & consistent regulatory application of AERMOD • Basic tenets: • Keep principle based - avoid overly prescriptive guidance • Recognize the importance of initial decisions (precedence) • Allow flexibility for unique cases • Vet, document & rule-make where appropriate • Types of guidance: • Appendix “W” • EPA Report • OAQPS policy memos • Clearinghouse memos • Individual precedents

  5. Implementation Guide • Selecting Surface Characteristics (Bo, r & zo) • Defining representativeness • Matching meteorological data with source location • Selecting population for urban runs • Modeling sources in gently down-slopping terrain • Capped and horizontal stacks • AERMAP: • Domain boundary • Manual entry of terrain • Use of the area source algorithm

  6. Model Improvements • Near-Term Improvements: • AERSCREEN • Surrogate for on-site cloud cover (Bulk Richardson # approach) • Possible future improvements (e.g.): • Selecting surface characteristics (AERSURFACE) • Capped & horizontal stacks • Reformulate urban • Code optimization • Use of gridded met data • Meander for area sources • PM2.5 Output: 98th percentile concentrations • Add wind direction dependency for hc • Add additional source types: • Line source • Buoyant line • Flares • Improve Bo treatment by including soil moisture

  7. Summary • Implementation issues are expected • Implement in a manner that facilitates consistency in permitting and SIP development • Implementation process: • ISC or AERMOD for first year • Provide advice for presently understood issues (Implementation Guide) • Deal with case specific issues in a timely manner • Communicate decisions (Clearinghouse Memos) • Develop formal guidance as experience is gained and consensus is reached • Allow for flexibility • Improve AERMOD as $$$$ allow

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