Mitchel! E. Daniels, Jr, 

### Governor Thomas W. Easterly 

### Commissioner INDIANA DEPARTMENT OF ENVIRONMENTAL MANAGEMENT 

### We make Indiana a cleaner, healthierplace to live. 

### too North Senate Avenue Indianapolis. Indiana46204 (317) 232·8603 (800) 451-6027 www.IN.gov/idem

Ms. Louise Gross Legislation/Clean AirAct U.S. Environmental Protection Agency Region V 77 West Jackson Boulevard Chicago, IL 60604-3950

DearMs. Gross: 11-25-2008

Re: Supplemental Information Clean AirAct Section 110(1) Demonstration and State Implementation Plan Revisions for Clark and Floyd Counties, Indiana

This letter is to reaffirm/clarify the supplemental information provided to you on August 18, 2008 regarding a legal review ofthe applicable statutory procedure for implementation ofa vehicle inspection and maintenance (11M) program in Clark and Floyd counties. This review was conducted at your requestin orderto further explain how this procedure works in conjunction with the Clean Air Act Section 110(1) Demonstration and State Implementation Plan (SIP) Revision, demonstrating1hadfM would be aviable contingency measure for the applicable attainment and maintenance SIPs (fine particles and ozone). Based on this legal review, Indiana statute does, in fact, permit the State ofIndianathe authority to timely implement a vehicle liM program whenever necessary, ifit is found to be an appropriate and effective control measure. IDEM would then notify the budget agency ofthe need to consider and approve implementation ofliM in Clark_and Floyd counties. IDEM does reserve the right to select and implement additional control measures in lieu of11M ifthey are deemed to be more**cost-effective~** provide equivalent emissions reductions, and sufficiently addresses the air quality problem. IDEM believes that this supplemental information in conjunction with the Clean AirAct 110(1) Demonstration, provides the necessary weight ofevidence to demonstrate that 11M is a viable contingency measure for the applicable attainment and maintenance SIPs. IDEM also believes that its non-interference demonstration submitted to the U.S. EPA with arequest for parallel processing on October 10,2006 and a final submission onNovember 15,2006 to support the discontinuation ofthe 11M program in Clark and Floyd counties, Indiana remains**valid~** with no adverse impacts evident for the area. iII

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I jMs. Louise Gross Page 2 Therefore, IDEM hereby respectfully requests that the U.S. EPA proceed with final review and approval ofthe Clean Air Section 

### 110(1) Demonstration for Clark and Floyd counties. Ifyou have any questions or need additional infonnation, please contact ScottDeloney, Chief, Air Programs Branch, at (317) 233-5694 or sdeloney@idem.in.gov orAnn Long, Attorney, Office of Legal Counsel, at (317) 232-8551 or along@idem.in.gov.

Daniel Murray, sis Office ofAir Quality Indiana DepartmentofEnvironmental Management DM/sd
cc: Cheryl Newton, U.S. EPA John Mooney, U.S. EPA Scott Deloney, IDEM Ann Long, IDEM i

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