6560.50 ENVIRONMENTAL PROTECTION AGENCY 40 CFRPart 52 [EPA-R08-0RA-2009-0052; FRL-9136-5] 

### Approval and Promulgation ofAir QualityImplementation Plans; Wyoming; Revisions to theWyoming Air Quality Standards and Regulations AGENCY: Environmental Protection Agency (EPA). 

### ACTION: Proposed Rule 

### SUMMARY: EPA is proposing to approve two State Implementation Plan (SIP) revisions submitted by the State ofWyoming on September 11, 2008. Wyoming has revised its Air Quality Standards and Regulations, specifically Chapter 1, Section 5, Unavoidable equipment malfunction, and Chapter 1, Section 6, Credible evidence. EPA is taking this action under section 110 ofthe Clean AirAct. In the "Rules and Regulations" section ofthis 

### FederalRegister, EPA is approving the State's SIP revision as a direct final rule withoutpriorproposal because the Agency views this as a noncontroversial SIP revision and anticipates no adverse comments. A detailed rationale for the approval is set forth in the preamble to the direct final rule. IfEPA receives no adverse comments, EPA will not take further action on this proposed rule. IfEPAreceives adverse comments, EPA will withdraw the direct final rule and it will nottake effect. EPA will address all public comments in a subsequent final rule based on this proposed rule. EPA will not institute a second commentperiod on this action. Any parties interested in commenting must do
so at this time. Please note that ifEPA receives adverse comment on an amendment, paragraph,
or section ofthis rule and ifthatprovision may be severed from the remainder ofthe rule, EPA
1may adopt as final those provisions ofthe rule that are not the subject ofan adverse comment. 

### DATES: Written comments must be received on or before [insert date 30 days after publication in the Federal Register]. 

### ADDRESSES: Submit your comments, identifiedby Docket ID No. EPA-R08-0AR-2009­ 0052, by one ofthe following nlethods:
• http://www.regulations.gov. Followthe on-line instructions for submitting comments.
• E-mail: dolan.kathy@epa.gov
• Fax: (303) 312-6064 (please alertthe individual listed in the 

### FORFURTHER INFORMATION CONTACT ifyou are faxing comments).
• Mail: Director, AirProgram, Environmental Protection Agency (EPA), Region 8, Mai1code 8P-AR, 1595 Wynkoop Street, Denver, Colorado 80202-1129.
• Hand Delivery: Director, Air Program, Environmental Protection Agency (EPA), Region 8, Mailcode 8P-AR, 1595 Wynkoop Street, Denver, Colorado 80202­ 1129. Such deliveries are only acceptedMonday through Friday, 8:00 a.m. to 4:30 p.m., excluding Federal holidays. Special arrangements should be made for deliveries ofboxed information. Please see the direct final rule which is located in the Rules Section ofthis 

### FederalRegisterfor detailed instruction on howto submit comments. 

### FORFURTHERINFORMATION CONTACT: Kathy Dolan, Air Program, U.S. Environmental Protection Agency (EPA), Region 8, Mailcode 8P-AR, 1595 Wynkoop Street, Denver, Colorado 80202-1129. 303-312-6142, dolan.kathy@epa.gov 2SUPPLEMENTARY INFORMATION: See the infornlation provided in the Direct Final action ofthe same title which is located in the Rules and Regulations Section ofthis Federal Register. Authority: 42 U.S.C. 7401 et seq.

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I I Dated: Carol L. Carnpbell Acting Deputy Regional Administrator Region 8

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