appw_05 - Wednesday, November 9, 2005 Part III...

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VerDate Aug<31>2005 16:55 Nov 08, 2005 Jkt 205001 PO 00000 Frm 00001 Fmt 4717 Sfmt 4717 E:\FR\FM\09NOR3.SGM 09NOR3 Wednesday, November 9, 2005 Part III Environmental Protection Agency 40 CFR Part 51 Revision to the Guideline on Air Quality Models: Adoption of a Preferred General Purpose (Flat and Complex Terrain) Dispersion Model and Other Revisions; Final Rule
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VerDate Aug<31>2005 16:55 Nov 08, 2005 Jkt 205001 PO 00000 Frm 00002 Fmt 4701 Sfmt 4700 E:\FR\FM\09NOR3.SGM 09NOR3 68218 Federal Register / Vol. 70, No. 216 / Wednesday, November 9, 2005 / Rules and Regulations ENVIRONMENTAL PROTECTION AGENCY 40 CFR Part 51 [AH–FRL–7990–9] RIN 2060–AK60 Revision to the Guideline on Air Quality Models: Adoption of a Preferred General Purpose (Flat and Complex Terrain) Dispersion Model and Other Revisions AGENCY: Environmental Protection ± Agency (EPA). ± ACTION: Final rule. ± SUMMARY: EPA’s Guideline on Air Quality Models (‘‘ Guideline ’’) addresses the regulatory application of air quality models for assessing criteria pollutants under the Clean Air Act. In today’s action we promulgate several additions and changes to the Guideline. We recommend a new dispersion model— AERMOD—for adoption in appendix A of the Guideline. AERMOD replaces the Industrial Source Complex (ISC3) model, applies to complex terrain, and incorporates a new downwash algorithm—PRIME. We remove an existing model—the Emissions Dispersion Modeling System (EDMS)— from appendix A. We also make various editorial changes to update and reorganize information. DATES: This rule is effective December 9, 2005. As proposed, beginning November 9, 2006, the new model—AERMOD— should be used for appropriate application as replacement for ISC3. During the one-year period following this promulgation, protocols for modeling analyses based on ISC3 which are submitted in a timely manner may be approved at the discretion of the appropriate Reviewing Authority. Applicants are therefore encouraged to consult with the Reviewing Authority as soon as possible to assure acceptance during this period. ADDRESSES: All documents relevant to this rule have been placed in Docket No. A–99–05 at the following address: Air Docket in the EPA Docket Center, (EPA/ DC) EPA West (MC 6102T), 1301 Constitution Ave., NW., Washington, DC 20004. This docket is available for public inspection and copying between 8 a.m. and 5:30 p.m., Monday through Friday, at the address above. FOR FURTHER INFORMATION CONTACT: Tyler J. Fox, Air Quality Modeling Group (MD–D243–01), Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711; telephone (919) 541–5562. ( Fox.Tyler@epa.gov ). SUPPLEMENTARY INFORMATION: Outline I. General Information II. Background III. Public Hearing on the April 2000 proposal IV. Discussion of Public Comments and Issues from our April 21, 2000 Proposal A. AERMOD and PRIME B. Appropriate for Proposed Use C. Implementation Issues/Additional Guidance ± D. AERMOD revision and reanalyses in 2003 1. Performance analysis for AERMOD (02222) ± a. Non-downwash cases: AERMOD (99351) vs. AERMOD (02222) b. Downwash cases 2. Analysis of regulatory design
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This note was uploaded on 09/11/2011 for the course ENV 6146 taught by Professor Staff during the Spring '11 term at University of Florida.

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appw_05 - Wednesday, November 9, 2005 Part III...

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