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Environmental Protection Agency 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 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 68218 Federal Register / Vol. 70, No. 216 / Wednesday, November 9, 2005 / Rules and Regulations ENVIRONMENTAL PROTECTION telephone (919) 541–5562. SCRAM) at: www.epa.gov/scram001. AGENCY ([email protected]). You may find codes and documentation SUPPLEMENTARY INFORMATION: for models referenced in today’s action 40 CFR Part 51 on the SCRAM Web site. We have also Outline uploaded various support documents [AH–FRL–7990–9] I. General Information (e.g., evaluation reports). II. Background RIN 2060–AK60 III. Public Hearing on the April 2000 II. Background proposal The Guideline is used by EPA, States, Revision to the Guideline on Air IV. Discussion of Public Comments and Quality Models: Adoption of a and industry to prepare and review new Issues from our April 21, 2000 Proposal source permits and State Preferred General Purpose (Flat and A. AERMOD and PRIME Complex Terrain) Dispersion Model B. Appropriate for Proposed Use Implementation Plan revisions. The and Other Revisions C. Implementation Issues/Additional Guideline is intended to ensure Guidance consistent air quality analyses for AGENCY: Environmental Protection D. AERMOD revision and reanalyses in activities regulated at 40 CFR 51.112, Agency (EPA). 2003 51.117, 51.150, 51.160, 51.166, and ACTION: Final rule. 1. Performance analysis for AERMOD 52.21. We originally published the (02222) Guideline in April 1978 and it was SUMMARY: EPA’s Guideline on Air a. Non-downwash cases: AERMOD (99351) incorporated by reference in the Quality Models (‘‘Guideline’’) addresses vs. AERMOD (02222) b. Downwash cases regulations for the Prevention of the regulatory application of air quality 2. Analysis of regulatory design Significant Deterioration (PSD) of Air models for assessing criteria pollutants concentrations for AERMOD (02222) Quality in June 1978. We revised the under the Clean Air Act. In today’s a. Non-downwash cases Guideline in 1986, and updated it with action we promulgate several additions b. Downwash cases supplement A in 1987, supplement B in and changes to the Guideline. We c. Complex terrain July 1993, and supplement C in August recommend a new dispersion model— E. Emission and Dispersion Modeling 1995. We published the Guideline as AERMOD—for adoption in appendix A System (EDMS) appendix W to 40 CFR part 51 when we of the Guideline. AERMOD replaces the V. Discussion of Public Comments and Issues issued supplement B. We republished from our September 8, 2003 Notice of Industrial Source Complex (ISC3) Data Availability the Guideline in August 1996 (61 FR model, applies to complex terrain, and VI. Final action 41838) to adopt the CFR system for incorporates a new downwash VII. Final editorial changes to appendix W labeling paragraphs. On April 21, 2000 algorithm—PRIME. We remove an VIII. Statutory and Executive Order Reviews we issued a Notice of Proposed existing model—the Emissions Rulemaking (NPR) in the Federal I. General Information Dispersion Modeling System (EDMS)— Register (65 FR 21506), which was the from appendix A. We also make various A. How Can I Get Copies of Related original proposal for today’s editorial changes to update and Information? promulgation. reorganize information. EPA established an official public III. Public Hearing on the April 2000 DATES: This rule is effective December 9, docket for this action under Docket No. Proposal 2005. As proposed, beginning November A–99–05. The official public docket is We held the 7th Conference on Air 9, 2006, the new model—AERMOD— the collection of materials that is Quality Modeling (7th conference) in should be used for appropriate available for public viewing at the Air Washington, DC on June 28–29, 2000. application as replacement for ISC3. Docket in the EPA Docket Center, (EPA/ As required by Section 320 of the Clean During the one-year period following DC) EPA West (MC 6102T), 1301 Air Act, these conferences take place this promulgation, protocols for Constitution Ave., NW., Washington, approximately every three years to modeling analyses based on ISC3 which DC 20004. The EPA Docket Center standardize modeling procedures, with are submitted in a timely manner may Public Reading Room (B102) is open special attention given to appropriate be approved at the discretion of the from 8:30 a.m. to 4:30 p.m., Monday modeling practices for carrying out appropriate Reviewing Authority. through Friday, excluding legal programs PSD (42 U.S.C. 7620). This Applicants are therefore encouraged to holidays. The telephone number for the conference served as the forum for consult with the Reviewing Authority as Reading Room is (202) 566–1744, and receiving public comments on the soon as possible to assure acceptance the telephone number for the Air Docket Guideline revisions proposed in April during this period. is (202) 566–1742. An electronic image 2000. The 7th conference featured ADDRESSES: All documents relevant to of this docket may be accessed via presentations in several key modeling this rule have been placed in Docket No. Internet at www.epa.gov/eDocket, where areas that support the revisions A–99–05 at the following address: Air Docket No. A–99–05 is indexed as promulgated today. A presentation by Docket in the EPA Docket Center, (EPA/ OAR–2003–0201. Materials related to the American Meteorological Society DC) EPA West (MC 6102T), 1301 our Notice of Data Availability (AMS)/EPA Regulatory Model Constitution Ave., NW., Washington, (published September 8, 2003) and Improvement Committee (AERMIC) DC 20004. This docket is available for public comments received pursuant to covered the enhanced Gaussian public inspection and copying between the notice were placed in eDocket OAR– dispersion model with boundary layer 1 8 a.m. and 5:30 p.m., Monday through 2003–0201. parameterization: AERMOD.2 Also at Friday, at the address above. Our Air Quality Modeling Group the 7th conference, the Electric Power FOR FURTHER INFORMATION CONTACT: maintain an Internet website (Support Research Institute (EPRI) presented Tyler J. Fox, Air Quality Modeling Center for Regulatory Air Models— evaluation results from the recent Group (MD–D243–01), Office of Air research efforts to better define and 1 http://cascade.epa.gov/RightSite/ Quality Planning and Standards, U.S. dk_public_collection_detail.htm? characterize dispersion around Environmental Protection Agency, ObjectType=dk_docket_collection&cid=OAR-2003- Research Triangle Park, NC 27711; 0201&ShowList=items&Action=view. 2 AMS/EPA Regulatory MODel. 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 Federal Register / Vol. 70, No. 216 / Wednesday, November 9, 2005 / Rules and Regulations 68219 buildings (downwash effects). These to public concerns, we believed that the considered and discussed all significant efforts were part of a program called the revised AERMOD merited another comments. Whenever the comments Plume RIse Model Enhancements public examination of performance revealed any new information or (PRIME). At the time, PRIME was results. Also, since the April 2000 NPR, suggested any alternative solutions, we integrated within ISC3ST (ISC–PRIME) the Federal Aviation Administration considered this prior to taking final and the results presented were within (FAA) decided to configure EDMS 3.1 to action. the ISC3 context. As discussed in incorporate the AERMOD dispersion The remainder of this preamble today’s rule, the PRIME algorithm has model. FAA presented this strategy at section discusses the primary issues now been fully integrated into the 7th conference and performance encountered by the Agency during the AERMOD. evaluations at two airports were to be public comment period associated with We proposed an update to the available before final promulgation. the April 2000 proposal. This overview Emissions and Dispersion Modeling This was in response to public concern also serves in part to explain the System (EDMS 3.1), which is used for over lack of EDMS evaluation. changes to the Guideline in today’s assessing air quality impacts from On April 15, 2003 we published a action, and the main technical and airports. A representative of the Federal Notice of Final Rulemaking (NFR; 68 FR policy concerns addressed by the Aviation Administration (FAA) 18440) that adopted CALPUFF in Agency. presented a further upgrade to EDMS appendix A of the Guideline. We also A. AERMOD and PRIME 4.0 that would include AERMOD and made various editorial changes to forthcoming performance evaluations update and reorganize information, and AERMOD is a best state-of-the- for two airports. removed obsolete models. We practice Gaussian plume dispersion The presentations were followed by a announced that action on AERMOD and model whose formulation is based on critical review/discussion of AERMOD the Emissions and Dispersion Model planetary boundary layer principles. and available performance evaluations, (EDMS) for assessing airport impacts AERMOD provides better facilitated jointly by the Air & Waste was being deferred, and would be characterization of plume dispersion Management Association’s AB–3 reconsidered in a separate action when than does ISC3. At the 7th conference, Committee and the American new information became available for AERMIC members presented Meteorological Society’s Committee of these models. developmental and evaluation results of Meteorological Aspects of Air Pollution. This deferred action took the form of AERMOD. Comprehensive comments For the new models and modeling a Notice of Data Availability (NDA), were submitted on the AERMOD code techniques proposed in April 2000, we which was published on September 8, and formulation document and on the asked the public to address the 2003 (68 FR 52934).
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