Dave Freudenthal, Governor 

# Department of Environmental Quality To protect, conserve and enhance the quality ofWyoming's environment forthe benefitof current and future generations.

Y " May 3, 2007

Mr . Robbie Roberts Regional Administrator US EPARegion 8 1595 Wynkoop Street Denver, CO 80202-1129 John Corra, Director

RE : State Implementation Plan (SIP) Approval Request Per Section 110(a)(2)(D)(i) of the Clean Air Act (Wyoming Interstate Transport SIP) Dear Mr . Roberts: The State ofWyoming is submitting a revision to our State Implementation Plan (SIP) to address requirements under section 110(a)(2)(D)(i) of the Clean Air Act. Using guidance provided by EPAin 2006, the State of Wyoming has made a negative declaration with regard to impact on other states, demonstrating the following: Y Wyoming does not contribute to nonattainment or interfere with maintenance of the ozone or PMZ.5 standards in other states . Y Wyoming's PSD (Prevention of Significant Deterioration) Rule ensures that Wyoming does not interfere with PSD implementation in other states . Y Wyoming sources of emissions do not interfere with implementation of RAVI (Reasonably Attributable Visibility Impairment) in other states. >= Since states are not required to submit Regional Haze SIPs until December 2007, it is too early to assess the impact of transported pollution on visibility in federally protected areas . The above demonstration was made via a public process before the Wyoming Air Quality Advisory Board in Casper, Wyoming on December 11, 2006, where the revised SIP was recommended for adoption. " The revised SIP was forwarded to the Governor on April 9, 2007 and approved on April 15, 2007. Since all of the necessary State reviews and approvals have been secured, I am submitting two copies of the revised State Implementation Plan.

Herschler Building " 122 West 25th Street " Cheyenne,WY 82002 " http ://deq.state.wy.us ADMIN/OUTREACH ABANDONEDMINES AIRQUALITY INDUSTRIAL SITING LANDQUALITY SOLID&HAZ

. WASTE WATERQUALITY (307) 777-7758 (307) 777-6145 (307) 777-7391 (307) 777-7369 (307) 777-7756 (307) 777-7752 (307) 777-7781 FAX777-3610 FAX 777-6462 FAX 777-5616 FAX777-6937 FAX777-5864 FAX 777-5973 FAX777-5973Mr . Robbie Roberts

May 3, 2007 Page 2 of 2 The following administrative materials are included in the plan submission and have been attached for your review : 1 . Acopy of the Certification Page for State Implementation Plans for the Air Quality Division of the Department of Environmental Quality, indicating April 15, 2007 as the approval date of the SIP revision. 2 . An April 9, 2007 memorandum from John Corra, Director of the Department of Environmental Quality, to the Governor recommending approval of the revised SIP, in order that the revised SIP can be submitted to EPA . 3. An April 24, 2007 letter fromNancy Vehr, Senior Assistant Attorney General, documenting the necessary legal authority under State law to adopt and implement the revised SIP. 4. Acopy of the notice issued by the Air Quality Division for the public meeting with a list of newspapers and dates ofpublication. 5. Alist of signatures ofwitnesses present at the December 11, 2006 meeting as well as a copy of the agenda. 6 . Acopy ofthe revised Wyoming Interstate Transport SIP . With this submission I amasking for Environmental Protection Agency approval of the revised Wyoming Interstate Transport SIPfor the State ofWyoming as approved by the Governor on April 15, 2007. If you have any questions regarding this submittal, please feel free to contact David A . Finley, Air Quality Administrator, at 307-777-7391 . Sincerely,

V . Corra irector Department of Environmental Quality Enclosures cc: David A

. Finley, Administrator, Air Quality Division w/enc. Christine Anderson, Air Quality Division w/enc. Domenico Mastrangelo, EPAw/enc.CERTIFICATION PAGE FORSTATE IMPLEMENTATION PLANS FORTHE

AIR QUALITY DIVISION OF THE DEPARTMENT OF ENVIRONMENTAL QUALITY I, John V

. Corra, do hereby certify that I am the administrative head of the Department of Environmental Quality (DEQ . I have attached a copy of the State Implementation Plan (SIP) pertaining to Interstate Transport . In accordance with W

.S. 9-1-208, 35-11-102, -109, -110, and the Governor's delegation of authority for SIP submittals dated April 4, 2003, the DEQDirector has the authority to develop and submit SIPs reviewed and approved by the Governor . - This SIP was developed to comply with requirements of the Clean Air Act 110(a)(2)(D)(i) for the 8-hour ozone and PMZ.5 NAAQS promulgated in July 1997. The Public Hearing Notice of a change in the SIPwas provided through paid advertisement in the following newspapers Casper Star Tribune - November 10, 2006, Gillette News-Record - November 10, 2006, Wyoming Tribune Eagle - November 11, 2006, Rock Springs Daily Rocket Miner - November 11, 2006, which were published at least 30days prior to the date of the public hearing. Notice was also provided through a general mailing to 199 interested parties, including the Regional EPAAdministrator and a continuous posting on the Air Quality Division website at http://deg.state.wy.us/aqd/index.asp?paQeid=8. Acopy of the Public Hearing Notice is attached hereto as Appendix A

. The proposed SIP was made available for public inspection at The Department of Environmental Quality, Herschler Building, 2"d Floor, 122W . 25th Street, Cheyenne, Wyoming, 82002, as well as through the Air Quality Division website: The Air Quality Division held a public hearing on this SIP before the Air Quality Advisory Board on December 11, 2006 at the Casper DEQField Office, 152 N . Durbin, Suite 100, Casper, Wyoming. The Air Quality Advisory Board recommended adoption of this SIP on December 11, 2006 . Procedures described above satisfy the requirements for public hearings under 40 CFR 51 .102 for preparing SIPs. The DEQhereby adopts this SIPon J-1S- c,7

Direct GOVERNOR'S STATEMENT , Department of Environmental Quality

I have reviewed and approved DEQ's adoption of this SIP.

ate Approved ` 5WDave Freudenthal, Governor 

# Department of Environmental Quality To protect, conserve and enhance the quality ofWyoming's environment forthe benefit of current and future generations. To: Governor Freudenthal John Corra, Director From : John V

. Corra, Director, Department of Environmental Quality (DEQ) (The agency cor~t ct rson is Christine Anderson, 307-673-9337, tander(r).state.wy.us /~) Subject : Revision to the State Implementation Plan (SIP) Required Under Section 110(a)(2)(D)(i) of the

CleanAirAct Date: April 9, 2007 Priority: Normal Summary: The State of Wyoming is submitting a revision to the State Implementation Plan (SIP) to address

requirements under section 110(a)(2)(D)(i) of the Clean AirAct. This portion of the CleanAir Act requires states to address emissions that could affect other states through interstate transport. EPA issued guidance to states on how to prepare SIPs to satisfy these requirements in August and September of 2006. Usingthis guidance, the State has made a negative declaration with regard to impact on other states, demonstratingthe following: Wyoming does not contribute to nonattainment or interfere with maintenance ofthe ozone or PM, .5 standards in other states. Wyoming's PSD(Prevention of Significant Deterioration) Rule ensures that Wyoming does not interfere with PSDimplementation in other states. Wyoming sources of emissions do not interfere with implementation of RAVI (Reasonably Attributable Visibility Impairment) in other states. Since states are not required to submit Regional Haze SIPs until December 2007, it is too early to assess the impact oftransported pollution on visibility in federally protected areas. This demonstration was made througha public process before the Air Quality Advisory Board in Casper, Wyoming on December 11, 2006. Documentation of the public process has been provided in the attached "Certification Page for State Implementation Plans for the Air Quality Division ofthe Department of Environmental Quality" . The Environmental Protection Agency (EPA) must approve or deny these revisions to the SIP by May 25, 2007. The Department is reconunending that you sign the attached certification page, so that the SIP revisions can be submitted to EPA and approved in lieu of a Federal Implementation Plan. Governor's Response Options: Sign the attached certification page and return to David A . Finley, Administrator, Air Quality Division, 2"d Floor Herschler Building. Delay submittal and schedule a meeting with

Governor's Staff Representative cc: David A

. Finley, AQD Nancy Vehr, AG Christine Anderson. AQD Herschler Building " 122 West 25th Street " Cheyenne, WY 82002 " http ://deq.state.wy.us ADMIN/OUTREACH ABANDONEDMINES AIR QUALITY INDUSTRIAL SITING LANDQUALITY SOLID &HAZ. WASTE WATERQUALITY (307) 777-7758 (307) 777-6145 (307) 777-7391 (307) 777-7369 (307) 777-7756 (307) 777-7752 (307) 777-7781 FAX777-3610 FAX 777-6462 FAX 777-5616 FAX777-6937 FAX 777-5864 FAX777-5973 FAX777-5973

# Office oftheAttorney General

Governor Waterand Natural Resources Division ChiefDeputy Attorney General Dave Freudenthal 123 State Capitol Elizabeth C . Gagen Cheyenne,Wyoming 82002 Attomey General (307) 777-6946Telephone Deputy Attorney General PatrickJ . Crank (307) 777-3542 Fax JayA .Jerde 

### PRIVII .EGEDAND CONFIDENTIAL

April 24, 2007 Dave Finley, Administrator Air Quality Division Dept. ofEnvironmental Quality 122West 25th Street Cheyenne, WY 82002 RE: Legal Authority to Adopt and ImplementAmendments to Wyoming's State Implementation Plan Addressing Requirements Under Section 110(a)(2)(D)(i) of the Clean Air Act (Interstate Transport) 

### Dear Dave, On April 10, 2007, Tina Anderson submitted a request on your behalf for a letter of advice as to whether Wyoming lawfully adopted Wyoming's State Implementation Plan (SIP) revision required pursuant to Section 110(a)(2)(D)(i) of the Clean Air Act (CAA)(Interstate Transport Provision) . When a new

National AmbientAir Quality Standard (NAAQS) is promulgated, the Interstate Transport Provision requires states to submit SIPs addressing emissions that may affect neighboring states throughinterstate transport. In 1997, EPAissued new NAAQS for ozone andparticulate matter with a diameter of 2.5 micrometers or smaller (PM2.5) . See 62 Fed. Reg. 38,652 (PM2.5), 62Fed . Reg. 38,856 (ozone) . OnApril 25, 2005, EPAfoundthat state SIPs failed to meet therequirements oftheInterstate Transport Provision. 70 Fed. Reg. 21147. States must submit a SIP and obtain EPAapproval by May 25, 2007 or theywill be subjectto a Federal Implementation Plan (FIP) . In August and September 2006, EPAissued guidance to the states for preparing SIPs satisfying theInterstate Transport Provision. Followingthis guidance,WyomingDepartment of Environmental Quality, Air Quality Division (DEQ/AQD) developed an InterstateDave Finley Re: Section 110(a)(2)(D)(i) April 24, 2007 Pg2of2 Transport SIP making a negative declaration to demonstrate that : 1) Wyoming does not contribute to non-attainment or interfere with maintenance ofthe ozone or PM2 .5 standards in other states; 2) Wyoming's Prevention of Significant Deterioration (PSD) rule ensures that Wyoming does not interfere with PSD implementation in other states; 3) Wyoming emissions sources do not interfere with the implementation of Reasonably Attributable Visibility Impairment (RAVI) in other states; and, 4) Wyoming is still assessing the impact of transported pollution on visibility in federally protected areas and will be submitting a Regional Haze SIP addressing such impacts by December, 2007. Wyoming's legislature has authorized the DEQ Director to perform

"any andall acts necessary" to carryoutthepurposeofthe Environmental QualityAct. SeeWYO . STAT.ANN

. §§ 9-2-2013; 35-11-102,-109 and -110 . Specifically, the DEQ Director is authorized to consult and cooperate with the federal government and "represent Wyoming in any matters pertaining to plans . . . relating to environmental enhancement andprotection." WYO . STAT. ANN . § -§ 35-11-109(a)(ii) and (viii) . All plans prepared by the DEQ must besubmitted tothe governor for review

and approval . WYO

. STAT.ANN

. § 9-1-208

. Thus, the statutory scheme vests the DEQ

Directorwith theauthorityandresponsibility to develop and adopt CAASIPS . Then, theGovernor approves the SIPand either theGovernor orhis designee submits the SIP to EPA . In connectionwiththis letter ofadvice, I have reviewed Section 110(a)(2)(D)(i) ofthe CAA, the Wyoming Environmental QualityAct, the SIPPublic Hearing Notice, theminutes fromthe December 11, 2006, Air Quality Advisory Board meeting, the DEQ/AQD SIP Certification Page, and Wyoming's Interstate Transport SIP. Based upon my review, it is my opinion that WDEQ, upon approval by the Governor, has the authority to adopt and implement the Interstate Transport SIP and complied with state law in adopting the SIP

. 

### Please call me ifyou have any questions.

Vehr 't. Attorney GeneralThe Wyoming Department of Environmental Quality Air Quality Division (WDEQ-AQD) The WyomingAir Quality Advisory Board will meet on December 11, 2006, in the Conference Room of the Casper DEQ

Field Office, 152 N

. Durbin, Suite 100, Casper, Wyoming at 10:00 AM . The Air Quality Division (AQD) is requesting the Board's consideration of a State Implementation Plan (SIP) for Interstate Transport to satisfy the requirements of Section 110(a)(2)(D)(i) of the Clean Air Act for ozone and particulate matter . AQDis also proposing revisions to WyomingAir Quality Standards and Regulations (WAQS&R) Chapters 3, 5, and 11 . Most of the changes to Chapter 3, General Emission Standards, Chapter 5, National Emission Standards and Chapter 11, National Acid Rain Program are updates to the annual effort to adopt by reference fromthe Code of Federal Regulations. The Division is also making minor corrections to these chapters . Some of the revisions in Chapter 3 involve changes to the SIP . The public is invited to attend and provide oral or written comments to the Board and AQDon all matters before the Board. Comments submitted by email will not be included in the public record. Electronic copies of the rule changes and the proposed Interstate Transport SIP will be available after November 13, 2006 at http://deq.state.wy.us/aqd/index.asp?pageid=8. If you have questions on the rule changes or request hard copy format, please contact Christine Anderson at 307-673-9337. For additional information contact David A . Finley, Administrator, Air Quality Division at 307- 777-7391 . In accordance with the Americans with Disabilities Act, special assistance or alternativeformats will be made available upon requestfor individuals with disabilities.AQAB Meeting of 12/11/06 Public Notice N ewspaper Date of Publication Casper Star Tribune November 10, 2006 Gillette News-Record November 10, 2006 Wyoming Tribune Eagle November 11, 2006 Rock Springs Daily Rocket Miner November 11, 2006 Cody Enterprise November 13, 2006O O G~r u F w w o ° 

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---- a a w a H a Q w a NWYOMINGAIRQUALITY ADVISORY BOARD MEETINGAGENDA December 11, 2006 at 10:00 AM WDEQCasper Field Office - Conference Room

152 N . Durbin, Suite 100 Casper, Wyoming

I . CALL TOORDER II . APPROVAL OF MEETING MINUTES FORJULY 10-11, 2006 MEETING III . OLDBUSINESS A . StaffActivity 1 . Hiring Status 2. Reorganization of the Monitoring Program B. Enforcement Activities Report C . Status Update on Previous Board Activities and Other Old Business IV. NEW

BUSINESS A . Proposed Interstate Transport State Implementation Plan (SIP) B. Proposed Changes to WyomingAir Quality Standards and Regulations: Chapter 3, General Emission Standards, Section 2, Emission standards for particulate matter, Section 6, Emission standards for volatile organic compounds and Section 8, Emission standards of asbestos for demolition, renovation, manufacturing, spraying and fabricating Chapter 5, National Emission Standards, Section 2, New source performance standards and Section 3, National emission standards for hazardous air pollutants Chapter 11, National Acid Rain Program, Section 2, Acid rain program V . SCHEDULE NEXT MEETING VI . ADJOURN

## WYOMINGSTATE IMPLEMENTATION PLAN INTERSTATE TRANSPORT TOSATISFY THE REQUIREMENTS OF CLEANAIRACT 110(a)(2)(D)(i)

FORTHE 8-HOUR OZONE ANDPM2.5 NAAQS PROMULGATED INJULY 1997

Presented Before the Wyoming Air Quality Advisory Board

December 11, 2006

### WYOMING STATE IMPLEMENTATION PLAN

A . Introduction The Clean Air Act, § 110(a)(2)(D)(i), requires that each state implementation plan (SIP) submitted to EPAmust address emissions that affect other states through interstate transport. In addition, states must ensure that no SIPinterferes with another state's programto prevent significant deterioration ofits air quality, or interferes with visibility in another state. Until August 2006, there had been no EPA guidance as to the appropriate scope of such a SIP. On April 25, 2005, in response to a lawsuit, EPApublished (70 FR 21147) a finding that states had failed to submit SIPs meeting the requirements of 110(a)(2)(D)(i) within three years after EPAissued new

National Ambient Air Quality Standards (NAAQS) for ozone and PM2.5 in 1997. The finding requires that EPA issue a Federal Implementation Plan (FIP) for any state that does not submit a SIP and obtain EPA approval of it by May 25, 2007. On August 15, 2006, EPAissued final guidance to states for preparation of SIPs that satisfy the 110(a)(2)(D)(i) requirements, and, on September 11, 2006, added a supplement to the guidance. There are four components of 110(a)(2)(D)(i) that must be addressed. The first two, demonstrating adequate provisions to prevent emissions from Wyoming frominterfering with attainment or maintenance of the federal NAAQS in any other state, are discussed together in Part B below

. The requirement that Wyoming show no interference with another state's program to prevent significant deterioration of its air quality is found in Part C below, and discussion of Wyoming's influence on visibility is found in Part Dbelow . B . Nonattainment and Maintenance Area Impact The "good neighbor" provisions of § 110(a)(2)(D)(i) require that state SIPs prohibit any source or other type ofemissions activity within the Statefromemitting any air pollutant in amounts which will-- (I) contribute significantly to nonattainment in, or interference with maintenance by, any other state with respect to any such national primary or secondary ambient air quality standard. . . To demonstrate that emissions from Wyoming do not contribute to nonattainment or interfere with maintenance of the ozone or PM2 .5 standards issued in 1997, Wyoming relies on modeling work conducted by EPAto determine which states were to be covered by the Clean Air Interstate Rule (CAIR) . In the final CAIR rule, published on May 12, 2005, EPA described how it determined which states were subject to the rule because they contributed to ozone nonattainment in any state. EPA's first step was to remove fromconsideration those states whose upwind contributions were very low . "Specifically, EPA considered an upwind State not to contribute significantly to a downwind nonattainment area if the State's maximum contribution to the area was either (1) less than 2 ppb, as indicated by either of the two modelingtechniques; or (2) less than one percent ofthe total nonattainment in the downwind area." (See

Footnote 44, page 25191 ofVol . 70, No. 91, FRMay 12, 2005) . With respect to ozone, EPA determined in the technical work done for the CAIR rule, that Wyoming did not contribute to downwind nonattainment. On EPA's website for the Clean Air Interstate Rule, EPA states : Thefinal Clean Air Interstate Rule covers 28 eastern states and the District of Columbia. Air emissions in these states contribute to unhealthy levels ofground-level ozone, fine particles or both in downwind states. Several states are not included in the CAIR region because they do not contribute to downwind nonattainment. These states include: Alaska, Arizona, California, Colorado, Hawaii, Idaho, Kansas, Maine, Montana, Nebraska, Nevada, New Hampshire, New

Mexico, North Dakota, Oklahoma, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, and Wyoming . Finally, the closest nonattainment area for ozone (Las Vegas - Clark County) is approximately 400 miles away fromthe southwestborder ofWyoming. Considering the magnitude of the population associated with the Clark County Ozone Nonattainment Area and the geological and topological separation of Clark County from Wyoming, it is unlikely that Wyoming is a significant contributor to the nonattainment status in the Las Vegas area. With respect to determining whether Wyoming contributes to nonattainment or maintenance of the PM2.5 standard in other states, again Wyoming relies on EPAmodeling methodology. EPA says, Regarding modeling ofall States, in the PM2 .5 modelingfor the NPRM, we modeled 41 States, and

found that the westernmost ofthese States made very small contributions to nonattainment in any other State.' For the revised modelingfor thefinal rule, we reduced the set ofStates modeled [from41 to 37 for PM - the additional 4 states NOT rnodeledfor thefinal rule are Montana, Wyoming, Colorado, and New Mexico]for reasons ofefficiency. The results again showed that the westernmost States modeled did not make contributions above the significance threshold, indicating that had other even more western States been modeled they also would not have done so.' The closest PM2.5 nonattainment area is in Libby, Montana, which is approximately 325 miles upwind of the northern border ofWyoming. The technical support document submitted for the Libby, Montana area indicates that the sources of PM2 .5 are localized problems due to topography and meteorological factors. It is unlikely that Wyoming, which is downwind from the nonattainment area, contributes to the nonattainment status of Libby, Montana. Based on the conclusions stated by the EPAin the above-cited guidance and the relative distance to nonattainment areas, the State ofWyoming agrees that emissions from Wyoming do not significantly affect nonattainment or maintenance areas in other states .

1 The 9westernmost states that were NOT modeled for the NPRM are Idaho, Washington, Oregon, Nevada, California, Utah, Nevada, Alaska, and Hawaii . 2 Corrected Response To Significant Public Comments On the Proposed Clean Air Interstate Rule, March 2005, Corrected April 2005, Document ID No. EPA-HQ-2003-0053-2172, pages 200-201 .C

. Impact on PSD In § 110(a)(2)(D)(i)(II), the Clean Air Act requires that states prohibit emissions within the state frominterfering "with measures required to be included in the applicable implementation plan for any other State under part Cto prevent significant deterioration of air quality. . ." EPAguidance indicates that states with SIPs addressing Prevention of Significant Deterioration (PSD) and Nonattainment New Source Review(NNSR) have adequately demonstrated that they do not affect PSD implementation in other states: For the 8-hour ozone standard, each State only needs to make a SIPsubmission that confirms that major sources in the State are currently subject to PSDand NNSR permitting programs that apply to the 8-hour ozone standard and that SIP-approved States are on track to meet theJune 15, 2007 deadlinefor SIPsubmissions adopting the requirements of the Phase II ozone implementation . rule. For the PM-2.5 standard, States need only provide a SIPsubmission that confirrns that major sources in the State are subject to PSDand NNSRpermittingprograms implemented in accordance with EPA's interimguidance callingfor use ofPM-10as a surrogatefor PM-2.5 in the PSDand NNSR programs. 3 Wyoming has a fully-approved PSDprogram, and has successfully implemented this program for many years. Wyoming's PSDrules were revised effective October 6, 2006, to conform with the federal NSRReformrules. These changes have not yet been submitted to EPA and are not yet approved. With regard to being on track to meet the June 15, 2007 deadline for SIP submission adopting requirements of the Phase II ozone implementation rule, Wyoming has initiated the reviewof these changes, and will be working on rule revision over the next year. Until any of these changes are approved, the previously-approved versions are federally enforceable. Wyoming does not have a NNSR (nonattainment new source review) program since there has not been a need for one to date. Wyoming will update its PSDprogram to include a NNSR program in the future if the need should arise. Wyoming will implement the current rules in accordance with EPA's interimguidance using PM10 as a surrogate for PM2.5 in the PSDprogram

. Based on the conclusions stated by the EPAin the above-cited guidance, the State ofWyoming concludes that Wyoming's PSDSIP rule ensures that Wyoming does not interfere with PSD implementation in other states. D . Effects on Visibility The final requirement of § 110(a)(2)(D)(i)(II) is that states prohibit emissions within the state frominterfering with the programs of other states to protect visibility. In 1980, EPAissued regulations that required states to address reasonably attributable visibility impairment (RAVI) . EPA's recent guidance states that: 3 SIP Guidance on Section 110(a)(2)(D)(i) Findings ofFailure to Submit, August 11, 2006, page 2.At this point in time, EPA has made no determination that emissions fromany State inte7fere with measures required to be included in a plan to address reasonably attributable visibility impairment. Further, EPA is not aware of any certification of existing reasonably attributable impairment ofvisibility by a Federal Land manager that has not already been resolved. The EPA accordingly believes that States should be able to make a relatively simple SIPsubmission verifying that no source within the State emits pollutants that interfere with measures included in the visibility SIPs under the 1980 regulations. 4 Based on the conclusions stated by the EPA in the above-cited guidance, the State ofWyoming concludes that there are no Wyoming sources of emissions that interfere with implementation of RAVI SIPs in other states . Because states are not required to submit Regional Haze SIPs until December 2007, it is probably too early to assess the impact of transported pollution on visibility in federally protected areas. EPA's guidance states that : EPA believes that it is currently premature to determine whether or not State SIPsfor 8- hour ozone or PM2

.5 contain adequateprovisions to prohibit emissions that interfere with measures in other States' SIPs designed to address regional haze. Accordingly, EPA believes that States may make a simple SIPsubmission confrming that it is not possible at this time to assess whether there is any inte7ference with measures in the applicable SIP

for another State designed to "protect visibility "for the 8-hour ozone and PM2 .5 NAAQSuntil regional haze SIPs are submitted and approved.s Wyoming, however, submitted its first Regional Haze SIP to EPAin December 2003 under 40 CFR51 .309, already demonstrating reasonable progress in reducing impacts on Class I areas on the Colorado Plateau. The 2007 SIPupdate will analyze any impacts from Wyoming that extend beyond the Colorado Plateau and determine appropriate long-termstrategies for control measures.

`` Guidance for State Implementation Plan Submissions to Meet Current Outstanding Obligations Under Section 110(a)(2)(D)(i) for the 8-Hour Ozone and PM2 .5 National Ambient Air Quality Standards, EPA, August 15, 2006, page 9 . ' Guidance for State Implementation Plan Submissions to Meet Current Outstanding Obligations Under Section 110(a)(2)(D)(i) for the 8-Hour Ozone and PM2 .5 National Ambient Air Quality Standards, August 15, 2006. Pages 9-10.