### MEMORANDUM UNITED STATES ENVIRONMENTAL PROTECTION AGENCY RESEARCH TRIANGLE PARK, NC 27711



## MAY 20 2005 OFFICE OF AIR QUALITY PLANNING AND STANDARDS



### SUBJECT: Maintenance Plan GuidanceDocument for Certain 8-hour Ozone Areas Under Section 11O(

### a)(l) ofClean Air Act FROM: LydiaN. Wegman, Director Air Quality Strategies and Standar s Division TO: AirDivisionDirectors, Regions I-X

. SUMMARY The attached document provides guidance for States inpreparing maintenance plans under section 110(a)(1) ofthe Clean AirAct (CAA) for areas required to do so under 40 CFR 51.905(c) and (d). There are approximately 87 full orpartial counties that are affected, listed in Table 2 ofthe attached document. BACKGROUND On April 30, 2004 (69 FR23858), the Environmental Protection Agency (EPA) designated and classified areas for the 8-hour ground-level ozone National Ambient Air Quality Standard (NAAQS). Formost areas, these designations became effective June 15, 2004. Also onApril 30, 2004, (69 FR23951), EPApublished the final phase 1rule for implementation of the 8-hour ozone NAAQS. Section 51.905(c) and (d), established in that rulemaking, set forth requirements for anti-backslidingpurposes for areas designated attainment for the 8-hour standard. These provisions require these areas to submit a 10-yearmaintenance plan under section 110(a)(1) ofthe CAA ifthey also were a nonattainment area, or an attainment/ unclassifiable area with a section 175A maintenance plan, under the I-hour ozone standard. The purpose ofthis guidance is to address the maintenance requirements in Section 110(a)(1) ofthe CAA for these areas. We appreciate Region IV's leadership and the participation ofother Regional Offices in the development ofthis guidance.. In 

### addition, State and local air agencies have reviewed and commented on a prior draft.

Internet Address (URL) • http://www.epa.gov Recycled/Recyclable • Printed with Vegetable Oil Based Inks on Recycled Paper (Minimum 25% Postconsumer)2 

### Please make this guidance available to the affected State and local airpollution control



### .. 

### . agencIes In your regIon. Questions on this guidance maybe directed to: John Silvasi(silvasi.john@epa.gov), (919) 541-5666, Sharon Reinders (reinders.sharon@epa.gov), (919) 541-5284, orAnnie Nikbakht (nikbakht.annie@epa.gov), (919) 541-5246.

cc: OPSG

# Maintenance Plan Guidance Document for Certain 8-hour Ozone Areas Under Section 110(a)(1) of Clean Air Act
u.s. Environmental Protection Agency Office ofAir Quality Planning and Standards Research Triangle ParkNC 27711 May 20,2005

### General Applicability 1. What is the purpose ofthis guidance? Response: In 

### a Federal Register (FR) notice published April 30, 2004 (69 FR 23858), the Environmental Protection Agency (EPA) designated and classified areas for the 8-hour ground-level ozone national ambient air quality standard (NAAQS). Formost areas these designations became effective June 15,2004. 1 

### The purpose ofthis guidance is to address the maintenance requirements in Section 110(a)(I) ofthe Clean Air Act (CAA) for certain areas designated unclassifiable/attainment for the 8-hour ozone NAAQS. Specifically, the purpose of this document is to give the States guidance in developing a maintenance plan for those areas that are designated as unclassifiable/attainment for the 8-hour ozone standard and that had a designation ofeither attainment with an approved maintenance plan ornonattainment for the I-hour ozone standard, as ofthe effective date ofthe area's 8-hour ozone standard designation. 2. What is a 110(a)(I) maintenance plan? Response: A 110(a)(I) maintenance plan is a planrequired under Section 110(a)(l) ofthe CAA. This section ofthe Act requires that each state adopt and submit to EPAwithin three years after the promulgation ofa NAAQS**(un~er** 

### section 109) for any airpollutant, a plan which provides for implementation, maintenance, and enforcement ofsuch primary standard for all areas within the state. The maintenance planmustbe submitted to EPA as a state implementationplan (SIP) revision. 3. Does this guidance create newrequirements for 8-hour ozone maintenance plans? Response: No. EPA's Phase 1 Implementation Rule established the requirement that certain areas designated unclassifiable/at1ainment for the 8-hour ozone NAAQS are required to submit a maintenance plan for the 8-hour ozone NAAQS. See 69 FR 23951 (April 30, 2004). This guidance is consistent with the requirements established in 110(a)(I) ofthe CAA and the provisions ofEPA's Phase 1 Implementation Rule (40 Code ofFederal Regulation (CFR) Section 51.905(a) (3) and (4)). This guidance is designed to provide information regarding how States might fulfill the maintenance plan obligation established bythe CAA and EPA's Phase 1 Implementation Rule. This document does not substitute for the CAA or EPA's regulations, nor is it a regulation itself. Thus, it does not impose binding, enforceable requirements on anyparty. EPA retains the discretion to approve SIPs on a case-by-case basis that maydiffer from this guidance, but still complywith the statute and regulations. This guidance is a living document and maybe revised periodicallywithoutpublic notice. 4. What are the different designation scenarios associated with 8-hour ozone and I-hour

1Early Action Compact (EAC) areas will have a later effective date ofdesignation. Ifany such areas are initially designated unclassifiable/attainment for the 8-hour NAAQS and are attainment with a maintenance plan areas for the I-hourNAAQS, they will be required to submit a section IIO(a)(I) maintenance plan no later than 3 years after the effective date ofthe area's 8-hour attainment designation. 

### 1

### ozone area designations? Response: As ofthe effective date ofthe 8-hour ozone designations, there are six different scenarios possible with respect to the two NAAQS and their designation status: A. Areas that are designated unc1assifiable/attainment for the 8-hour ozone NAAQS and are designated unc1assifiable/attainment for the I-hour ozone NAAQS (8UA/lUA) B. Areas that are designated unc1assifiable/attainment for the 8-hour ozone NAAQS and are designated nonattainment for the I-hour ozone NAAQS. (8UA/IN) C. Areas that are designated unc1assifiable/attainment for the 8-hour ozone NAAQS and are designated attainment for the I-hour ozoneNAAQS with an approved maintenance plan. (8UA/IM) D. Areas that are designated nonattainment for the 8-hour ozone NAAQS and are designated unc1assifiable/attainment for the I-hour ozone NAAQS. 

### (8N/lUA) E. Areas that are designated nop.attainment for the 8-hour ozone NAAQS and are designated nonattainment for the I-hour ozone NAAQS. 

### (8N/IN) F. Areas that are designated nonattainment for the 8-hour ozone NAAQS and are designated attainment for the I-hour ozone NAAQS with an approved maintenance plan. 

### (8N/IM) Table 1 summarizes the 6 scenarios. Table 1 - Designation Status of8-hour Ozone Areas

1-hour ozone Unc1assifiab

### lei Nonattainment Attainment with a Attainment maintenance plan

8-hour Unc1assifiablel Scenario A Scenario B Scenario C ozone Attainment (8UA/IUA) (8UA/IN) (8UA/IM)

Nonattainment Scenario D Scenario E Scenario F (8N/IUA) (8NIlN) (8NIlM)

2

### 5. Which designation scenarios are addressed in this guidance? Response: This guidance only addresses areas that fall under scenarios Band C from Table 1: areas that are designated as unclassifiable/attainment for the 8-hour ozone standard and are either nonattainment for the I-hour standard (scenario B) or are designated attainment with a 175A maintenance plan for the 'l-hour ozone standard (scenario C). Table 2 lists the specific scenario Band C areas that are subject to this guidance. 

### Timine 6. When must a 110(a)(l) maintenance plan for scenario Band C be submitted to EPA? Response: Under 40 CFR 51.905(a)(3) and (4), States must submitsection 110(a)(l) maintenance plans no later than 3 years ,,:fter the effective date ofthe area's 8-hour ozone NAAQS designation. For most areas, June 15,2004, is the effective date ofthe 8-hour ozone NAAQS designations. Thus, for these areas, the section 110(a)(l) 8-hour ozone maintenance planmustbe submitted no later than June 15,2007. Ifthe State wishes to revise its existing I-hour ozone SIP for a scenario B or C area, prior to 3 years after designation, the revision would have to meet sections 110(1) and 193 ofthe Act. The EPA stronglyrecommends that the revision be incorporated into a 110(a)(I) maintenance plan that is submitted as part ofthat revision. Also note that 40 CFR 51.905(e)(l) requires approval ofa section 110(a)(I)plan ifthe State wishes to make either ofthe following SIP revisions: (a) removing the obligation to submit a maintenance plan for the I-hourNAAQS 8 years after approval ofthe initial I-hourmaintenance plan; or (b) removing the obligation to implement contingencymeasures upon a violation ofthe I-hourNAAQS. Please note that scenario C areas that are subject to 175Amaintenance planrequirements are still subject to those requirements for as long as those requirements remain a part ofthe approved SIP. 

### Maintenance Plan Components 7. What are the components ofa 110(a)(l) maintenance plan for scenario Band C areas? Response: The 8-hour ozone 110(a)(I) maintenance plan constitutes a SIP revision and must provide for continuedmaintenance ofthe 8-hour ozone NAAQS in the area for 10 years from the effective date ofthe area's designation as unclassifiable/attainment for the 8-hour ozone NAAQS. At a minimum, the maintenance plan for scenario Band C areas must include the five following components2 :

2 A projection ofemissions and demonstration ofmaintenance for 10 years is notrequired for any affected area ifthere are essentially no anthropogenic emissions in the nonattainment area. Itwould be absurd to have a maintenance plan with contingency measures for such an area. In addition, such an area would obviously notresult in contributions to downwind nonattainment areas. 

### 3

### Attainment Inventory - The attainment inventory should bebased on actual "typical summer day" emissions ofvolatile organic compounds and nitrogen oxides. The Phase 1 Implementation Rule provides that the 10-yearmaintenance period begins as ofthe effective date ofdesignation for the 8-hourNAAQS for the area. Forpurposes ofan attainment emissions inventory, the State

. mayuse one ofany ofthe three years onwhich the 8-hour attainment designation was based (i.e.,

2001,2002, and 2003).3 Because areas are already required to develop an inventory for 2002 under EPA's Consolidated Emissions Reporting Rule (CERR) (40 CFRPart 51, Subpart A, 67 FR 39602, June 10, 2002), we recommend that areas use that year as the attainment emission inventorybase year for the section 110(a)(1) maintenance plan. 

### Maintenance Demonstration - The key element ofa maintenance plan is a demonstration of how the areawill remain in compliance with the 8-hour ozone standard for the 10 yearperiod following the effective date ofdesignation as unc1assifiable/attainment. The end projection year is 10 years from the effective date ofthe attainment designation. For areas with an effective date ofdesignation for the 8-hourNAAQS ofJune 15, 2004, the endprojection year maybebeyond 2014. However, the maintenance plan must project attainment for 2014. The typical method that areas have used in the past to demonstrate that an areawill maintain the I-hour standard has beento identifythe level ofozone precursor emissions inthe areawhich is sufficient to attain the NAAQS and to show that future emissions ofozone precursors will not exceed the attainment levels. To perform this analysis, for the 8-hourmaintenanceplanthe state needs to develop emission inventories for one ofthe three years used to establish the area's attainment status and for the projection year. Maintenance may also be demonstrated using other methods, such as modeling. A State should work with the EPA Regional Office to determine whether a specific method for demonstrating maintenance is appropriate. 

### Ambient Air Quality Monitoring - This guidance provides general guidelines for network modification in the context ofsection 11

### O(a)(l) maintenance areas that need to be applied in light ofexisitng circumstances. Neither States nor EPA should treat these guidelines in ways that create disincentives to monitoring. The State should continue to operate air qualitymonitors inaccordance with 40 CFR 58 to verify maintenance ofthe8-hour ozone standard inthe area. Anymodification to the ambient air monitoring network, such as removal ofduplicative orunnecessarymonitors, shouldbe accomplished through close consultationwith the EPARegional office. Proposed network modifications shouldbe accompanied bytechnical and statistical analysis sufficient to document a given monitormayberemovedbecause it is unnecessary orduplicative

3 Because EAC areas will have a later effective date ofdesignation, a later year (e.g. 2005, 2006 or 2007) would be used for the purposes ofan emissions inventory.

. 

### 4

### in the case ofnetwork reductions ortojustifythe value ofinvesting in monitoring network enhancements. Forpurposes ofthis guidance, duplicative means monitoring for the same purpose and objective. A monitormaybe unnecessary when it monitored a violation ofthe 8- hour standard priorto the latest five complete three-yearperiods but has monitored attainment for the latest five complete three-year periods. 4,5 

### Ifthe monitor is violating for this period, we recommend that the monitoring site be retained. This time period is necessary to confirm that several non-overlapping data periods6 

### show sustained clean air due to strategic emission reductions rather than favorable meteorology. In 

### accordance with 40 CFR 58, the final network design will be subject to the approval ofthe Regional Administrator. Contingency Plan

- The State must develop a contingencyplan that, at a minimum, will ensure that any violation ofthe 8-hour ozone NAAQS is promptlycorrected. More details regarding the contingencyplan are provided in question 11 below. Additional information on contingency measures can also be obtained from the EPA Office ofAir QualityPlanning and Standards (OAQPS) and the EPApolicy Procedures forProcessingRequests to RedesignateAreas to Attainment (September4, 1992 John Calcagni memo to Air Directors) located at http://www

### .epa.gov/ttncaaalIt5/metalm845

### .html

. Verification ofContinued Attainment

- The submittal should indicate how the state will track the progress ofthe maintenance plan. This is necessary due to the fact that emissions projections made for the maintenance demonstration depend on assumptions ofpoint, area and mobile source growth. One option for tracking the progress ofthe maintenance demonstration, provided here as an example, would be for the State to periodicallyupdate the emissions inventory. The maintenance demonstration should project maintenance during the 10-yearperiod following the date ofdesignation for the 8-hourNAAQS, not simplythat the area will be in attainment in the 10th year. States should develop interim emission projection years to show a trend analysis for maintenance ofthe standard. These emission projections can also be used as triggers for implementing contingencymeasures. We recognize that it would be difficult and time-consuming to develop projections for each year ofthe 10-yearperiod. Therefore, the number ofinterim projection years should reflect whatever information exists regarding the potential for increases in emissions in the intervening years. For instance, ifthere is a highprobabilitythat emissions will decrease over the 10-yearperiod, fewer interim projections are needed; ifit is likelythat emissions will increase to such an extent as tojeopardize continued maintenance ofthe standard

- even

4(i) years 1,2, and 3; (ii) years 2, 3 and 4; (iii) years 3, 4 and 5; (iv) years 4, 5, and 6; and (v) years 5, 6, and 7). 5 Ofcourse, the period 2001-2003 would necessarily have to show attainment attainment, since this guidance applies only to areas initially designated attainment for the 8-hour ozone NAAQS using 2001-2003 data.
6 E

.g., period (i) does not have individual years in common with either period (iv) or(v). 

### 5

### temporarily

- over the intervening years, the number ofinterim projection periods should be sufficient to document that such increases will not interfere with maintenance ofthe 8-hour ozone standard. Ifthe precursor emissions projections are higher than the baseline inventory, a demonstration using a methodology selected in consultation with the appropriate EPARegional office would be needed to show that the increase in emissions continues to achieve compliance with the 8-hour ozone NAAQS. Where the demonstration is based on modeling, an option for tracking progress would be for the State to periodically (typically everythree years) reevaluate the modeling assumptions and input data. In 

### any event, the State should monitorthe indicatorsfor triggering contingencymeasures (as discussed in questions 10 and 11). Conformity 

### 8. Are scenario BandC areas considered "maintenance areas" for purposes ofconformity for the 8-hour standard? Response: No. Conformity for the 8-hour ozone standard does not apply in 8-hour unclassifiable/attainment areas that are subject to the CAA 110(a)(I)maintenance plan requirements. Conformity applies onlyto areas that are nonattainment orwere nonattainment and were then redesignated to attainment subject to the requirement to develop a maintenance plan under 175A ofthe Act with respect to a particularNAAQS. See CAA sectionI76(c)(5) for conformity applicabilityrequirements; see 40 CFR 93.101 and 93.102 for the definition of "maintenance area" and the applicabilityregulations for transportation conformity, respectively. Since scenario Band C areas were never designated nonattainment for the 8-hour standard and are not obligated to develop a maintenance planunder 175A for that standard, they are not subject to the conformityrequirements for the 8-hour standard. Conformity for the I-hour ozone standard will continue to apply in existing I-hournonattainment and maintenance areas (including scenario B and C areas) until that standard is revoked. When the I-hour standard is revoked, conformitywill not apply for either ozone standard in scenario Band C areas.. See 40 CFR 51.905(e)(3). Second 10-Year Plan Not Required 

### 9. Are scenario Band C areas required to develop a second 10 year maintenance plan that will apply after the first 10 years? Response: No. The Phase 1 Implementation Rule onlyrequires a maintenance plan for the first 10 years following designation for the 8-hour standard; it does not require areas to adopt a second 10-yearmaintenance plan as is required for areas subject to the section 175Amaintenance plan

6requirement. However, contingencyplans approved as part ofthe 110(a)(I) maintenance plan remain in effect and contingencymeasures could still be triggered ifthe area violates the 8-hour standard after the initial 10-yearperiod. 

### Contin2ency M·easures 10. Do I-hour controls remain inplace for 8-hourunclassifiable/attainment areas? Response: All control measures approved into the SIP remain in effect unless and until EPA approves a SIP revision removing ormodifying such measures. For control measures identified as "applicablerequirements" in section 51.900(f) ofthe regulations, the State maynot remove a measure from the SIP, but canrequest modification ofthe SIP such that the area is no longer required to implement the measure and that it insteadbe a contingencymeasure that wouldbe triggered bya future violation ofthe 8-hourNAAQS. Any SIP revision requesting removal or modification ofa control measure in the approved SIP must include a demonstration (as required by section 110(1) and 193 ofthe Act) that suchremoval ormodification will not interfere with maintenance ofthe 8-hour standard or any other applicable requirement ofthe Act. The Phase 1 Rule provides that before EPAwill approve a revision to a SIP removing the obligation to implement a contingencymeasure upon a violation ofthe I-hour standard in scenario Band C areas, the state must first submit the section 110(a)(l) maintenance plan for the 8-hourNAAQS. See 40 CFR 51.905 (e)(l). See the 110(1) guidance document and 40 CFR 51.905(c) for more details onrequirements for modifying orremoving I-hourcontrols in 8-hour unclassifiable/at1ainment areas. 11. What is an 8-hour ozone 110(a)(l) contingencyplan? Response: The Phase 1 Rule requires the section 110(a)(l) maintenance plan for scenario Band C areas to include contingencyprovisions, as necessary, to promptlycorrect anyviolation ofthe NAAQS that occurs (51.905(a)(3)(iii) and (4) (ii)). The contingencyplan should ensure that the contingencymeasures are adopted expeditiouslyonce they are triggered. Consistent with the mannerinwhich EPA4as interpreted the analogous requirements for contingencymeasures in section 175A, EPAbelieves that the SIP should contain an enforceable commitment to adopt and implement the contingency measures in a timely fashion once they are triggered. To do so, the plan should clearlyidentifythe measures to be adopted and a schedule and procedure for adoption and implementation, and a specific time limit for action bythe State. The schedule for adoption and implementation shouldbe as expeditious as practicable, but no longer than 24 months. The State should also identify specific indicators, ortriggers, which will be used to determine when the contingencymeasures need to be adopted and implemented. The trigger for implementation ofcontingencymeasures should, at a minimum, be upon a monitored violation of8-hour ozone NAAQS. Anotherrecommended trigger is when the area exceeds the precursor emission levels upon which maintenance is based. Because the State may

7

### need to adopt as well as implement the contingencymeasures and such action could take some time, we recommend that the State consider a trigger that would occurpriorto a violation ofthe NAAQS. Earlytriggers could avoid violations ofthe NAAQS, thus ensuring citizens are not exposed to unhealthy levels ofairpollution and also eliminating the potential for redesignation to nonattainment based upon a violation ofthe NAAQS.

8

### Table 2 I-hour Ozone NonattainmentlMaintenance Counties where at least a portion ofthe countywas designated unclassifiable/attainment for the 8-hour standard as ofJune 15, 2004. ListedbyRegion, State, Areas and County With Classification, NonattainmentlMaintenance Status, P=Part, Part CountyDescription, Rural Transport (RT)

8- Hour Ozone Unclassifiable/ Attainment Areas I-hour DesignationData Region/State 8-hour Attainment Area 8-hourAttainment Area Counties/Cities/Towns I-Hour Area Designation Status Region I NEW NH Hillsborough Co P Mont Vernon Town, Wilton Town Boston-Lawrence-Wor Serious HAMPHSIRE cester (E. MA), Nonattainment

I MA-NH NH Hillsborough Co P Includes onlythe following cities and towns: Antrim Manchester, NH Marginal Town, BenningtonTown, Deering Town, Francestown Nonattainment Town, Greenfield Town, Greenville Town, Hancock Town, Hillsborough Town, Lyndeborough Town, Mason Town, NewBoston Town, New Ipswich Town, PeterboroughTown, SharonTown, Temple Town, Weare Town, Windsor Town NH Merrimack Co P The entire county except the following town: Hooksett NH Rockingham Co P Includes only the following cities and towns: Deerfield Town, Northwood Town, NottinghamTown NH Strafford Co P The entire county exceptthe following cities and towns: Portsmouth-Dover-Roc Serious Dover, Durham, Rochester, Rollinsford, and hester, NH Nonattainment Somersworth

98- Hour Ozone Unclassifiable/Attainment Areas I-hourDesignation Data Region/State 8-hour AttainmentArea 8-hour AttainmentArea Counties/Cities/Towns I-Hour Area Designation Status Cheshire Co, NH NH Cheshire Co NH Cheshire Co Incomplete Data Incomplete Data Nonattainment Nonattainment MAINE ME Hancock Co P Entire county excluding the following cities and towns: Hancock & Waldo Cos, Marginal Bar Harbor, Blue Hill, Brooklin, Brooksville, Cranberry ME Maintenance Isles, Deer Isle, Frenchboro, Gouldsboro, Hancock, Lamoine, Mount Desert, Sedgwick, Sorrento, Southwest Harbor, Stonington, Sullivan, Surry, Swans Island, Tremont, Trenton, and Winter Harbor ME Waldo Co P Entire county excluding the following town):Islesboro ME Knox Co P Entire county excluding the following cities and towns: Knox & Lincoln Co.s, Moderate Camden, Criehaven, Cushing, Friendship, Isle au Haut, ME Nonattainment Matinicus Isle, Muscle Ridge Shoals, North Haven, Owls Head, Rockland, Rockport, St. George, South Thomaston, Thomaston, Vinalhaven, and Warren ME Lincoln Co P Entire county excluding the following cities and towns: Alna, Boothbay, BoothbayHarbor, Breman, Bristol, Damariscotta, Dresden, Edgecomb, Monhegan, Newcastle, Nobleboro, SouthBristol, Southport, Waldoboro, Westport, and Wiscasset ME Androscoggin Co P Entire county excluding the following town: Durham Lewiston-Auburn, ME Moderate Nonattainment**~** -**~ ~**  - - --



### 108- Hour Ozone Unclassifiable/Attainment Areas I-hourDesignation Data Region/State 8-hourAttainment Area 8-hourAttainmentArea Counties/Cities/Towns I-Hour Area Designation Status ME Cumberland Co P Entire county excluding the following cities and towns: Portland, ME Moderate Brunswick, Cape Elizabeth, Casco, Cumberland, Nonattainment Falmouth, Freeport, Frye Island, Gorham, Gray, Harpswell, Long Island, NewGloucester, North Yarmouth, Portland, Pownal, Raymond, Scarborough, SouthPortland, Standish, Westbrook, Windham, and Yarmouth ME York Co P Entire county excluding the following cities and towns: Alfred, Arundel, Berwick, Biddeford, Buxton, Dayton, Elliot, Hollis, Kennebunk, Kennebunkport, Kittery, Limington, Lyman,NorthBerwick, Ogunquit, Old Orchard Beach, Saco, Sanford, South Berwick, Wells, and York Region 3 PENNSYLVANIA PA Somerset Co PA Somerset Co Johnstown, PA Marginal Nonattainment PA Columbia Co PA Columbia Co Scranton-Wilkes-Barre, Marginal PA Nonattainment PA Crawford Co PA Crawford Co Crawford Co, PA Incomplete Data Nonattainment PA Juniata Co PA Juniata Co Juniata Co, PA Incomplete Data Nonattainment PA Lawrence Co PA Lawrence Co Lawrence Co, PA Incomplete Data Nonattainment PA Northumberland Co PAN orthumberland Co Northumberland Co, Incomplete Data PA Nonattainment 118- Hour Ozone Unclassifiable/Attainment Areas I-hour Designation Data Region/State 8-hour Attainment Area 8-hour Attainment Area Counties/Cities/Towns I-Hour Area Designation Status PAPike Co PA Pike Co Pike Co, PA Incomplete Data Nonattainment PA Schuylkill Co PA Schuylkill Co Schuylkill Co, PA Incomplete Data Nonattainment PA Snyder Co PA Snyder Co Snyder Co, PA Incomplete Data Nonattainment PA Susquehanna Co PA Susquehanna Co Susquehanna Co, PA Incomplete Data Nonattainment PA Warren Co PA Warren Co Warren Co, PA Incomplete Data Nonattainment PAWayne Co PA Wayne Co Wayne Co, PA Incomplete Data Nonattainment VIRGINIA VA Smyth Co The portion ofWhite Top Mountain above the 4,500 feet Smyth Co, VA (White Marginal RT elevation in Smyth county. Top Mtn) Nonattainment WEST VIRGINIA WV Greenbrier Co WV Greenbrier Co Greenbrier Co, WV Marginal Maintenance Region 4

FLORIDA FLDuvalCo FLDuval Co Jacksonville, FL Section 185A Maintenance

128- Hour Ozone Unclassifiable/Attainment Areas I-hour Designation Data Region/State 8-hour Attainment Area 8-hourAttainmentArea Counties/Cities/Towns I-Hour Area Designation Status FL Broward Co FL Broward Co Miami-Fort Moderate Lauderdale-W. Palm Maintenance FL Miami-Dade Co FL Miami-Dade Co Beach, FL

FL PalmBeach Co FL PalmBeach Co

FL Hillsborough Co FL Hillsborough Co Tampa-St. Petersburg- Marginal Clearwater, FL Maintenance FL Pinellas Co FL Pinellas Co

KENTUCKY KY Greenup Co P The area bounded as follows: Beginning at a point where Huntington-Ashland, Moderate the Ohio River meets the Greenup-Boyd County Line; WV-KY Maintenance proceeding southwest along the Greenup-Boyd County Line to thejunction ofthe East Fork ofthe Little Sandy River and the Greenup-Boyd County Line; proceeding north and west along the East Fork ofthe Little Sandy River to the confluence ofthe Little SandyRiver; proceeding north along the Little Sandy River to the confluence ofthe Ohio River;proceeding east along the Ohio River to the beginning. KYFayette Co KY Fayette Co Lexington-Fayette, KY Marginal Maintenance KY Scott Co KY Scott Co KY Daviess Co KY Daviess Co Owensboro, KY Marginal



### 138- Hour Ozone Unclassifiable/Attainment Areas I-hour Designation Data Region/State 8-hour Attainment Area 8-hour Attainment Area Counties/Cities/Towns I-Hour Area Designation Status KY Hancock Co P The areabounded as follows: Beginning at the Intersection ofU.S. 60 and the Hancock-Daviess County Line; proceeding east along U.S. 60 to the intersection of Yellow Creek and U.S. 60; proceeding north and west along Yellow Creek to the confluence ofthe Ohio River; proceeding west along the Ohio River to the confluence ofBlackford Creek; proceeding south and east along Blackford Creek to the beginning. KY Edmonson Co KY Edmonson Co Edmonson Co, KY Marginal RT Maintenance KY Livingston Co P The area bounded as follows: Beginning at the point Paducah, KY Marginal where the Marshall, McCracken, and Livingston County Maintenance Lines meet; proceeding due north to the Ohio River; proceeding east along the Ohio River and that part ofthe Livingston County Line to the northernmost point of Cumberland Island and then south to the point of confluence ofthe Cumberland River; proceeding east on the Cumberland River to the intersection ofU.S. 60 and the Cumberland River; proceeding north on U.S. 60 to thejunctionofJoe Grimmet Road and U.S. 60; proceeding to the end ofJoe Grimmet Road and extending a line from thatpoint to thejunction ofU.S. 70 and Heater Store Road; proceeding south along Heater Store Road to the intersection ofKy 1889 and Heater Store Road; proceeding south onHarvey Road to thejunction ofKy453 and HarveyRoad; proceeding west on Ky453 to thejunction ofHaddox Road and Ky 453; proceeding south along Haddox Road to the Tennessee River (at Haddox Ferry); proceeding west on the Tennessee River to the beginning

-- 148- Hour Ozone Unclassifiable/Attainment Areas I-hour Designation Data Region/State 8-hour Attainment Area 8-hour AttainmentArea Counties/Cities/Towns I-Hour Area Designation Status SOUTH SC Cherokee Co SC Cherokee Co Cherokee Co, SC Marginal CAROLINA Maintenance Region 5 MICHIGAN MIBayCo MI Bay Co Saginaw-Bay Incomplete Data City-Midland, MI Maintenance MI Midland Co MI Midland Co MI Saginaw Co MI Saginaw Co 

## omo ORPreble Co OR Preble Co Preble Co, OR Section 185A Maintenance WISCONSIN WI Walworth Co WI Walworth Co Walworth Co, WI Marginal Maintenance Region 6 LOmSIANA LA Lafayette Par LA Lafayette Par Lafayette, LA Section 185A Maintenance LA Calcasieu Par LA Calcasieu Par Lake Charles, LA Marginal Maintenance LA JeffersonPar LA Jefferson Par New Orleans, LA Section 185A Maintenance LA Orleans Par LA Orleans Par LA St Bernard Par LA St BernardPar LA St Charles Par LA St Charles Par LA BeauregardPar LA BeauregardPar Beauregard Par, LA Incomplete Data Maintenance

-- 158- Hour Ozone Unclassifiable/ AttainmentAreas I-hour Designation Data Region/State 8-hour Attainment Area 8-hour AttainmentArea Counties/Cities/Towns I-Hour Area Designation Status LA Grant Par LA Grant Par Grant Par, LA Incomplete Data Maintenance LA Lafourche Par LA Lafourche Par LaFourche Par, LA Incomplete Data Maintenance LA Pointe Coupee Par LA Pointe Coupee Par Pointe Coupee Parish, Incomplete Data LA Maintenance LA StJames Par LA St James Par St James Par, LA Incomplete Data Maintenance LA StMary Par LA St Mary Par St MaryPar, LA Incomplete Data Maintenance NEWMEXICO NM Dona Ana Co P Dona Ana Co The area bounded bythe New Sunland Park, NM (New Area Mexico-Texas State line on the east, the NewMexico- 1995) Marginal Mexico intemationalline onthe south, the Range Nonattainment 3E-Range 2E line on the west, and the N3200 latitude line onthe north. TEXAS TX EIPaso Co TX EI Paso Co EI Paso, TX Serious Nonattainment TX Victoria Co TX Victoria Co Victoria, TX Incomplete Data Maintenance Region 7 KANSAS and KS Johnson Co KS Johnson Co Kansas City, MO-KS Other MISSOURI Maintenance KS Wyandotte Co KS Wyandotte Co



### 168- Hour Ozone Unclassifiable/Attainment Areas I-hour Designation Data Region/State 8-hour AttainmentArea 8-hour AttainmentArea Counties/Cities/Towns I-Hour Area Designation Status MO Clay Co MO Clay Co MO Jackson Co MO Jackson Co MO Platte Co MO Platte Co Region 8 UTAH UTDavis Co UT Davis Co Salt Lake City, UT Moderate Maintenance UT SaltLake Co UT Salt Lake Co Region 9 ARIZONA AZ Maricopa Co P Gila River Indian tribe area Phoenix, AZ Serious Nonattainment CALIFORNIA CAKernCo P IndianWells Valleyplanning area: Thatportion ofKern East Kern Co, CA Serious County contained within Hydrologic Unit#18090205. Nonattainment

(redesignated to attainment/maintenance on 06121104 ) onJune 15,2004 CA Monterey Co CA Monterey Co Monterey Bay, CA Moderate Maintenance CA SanBenito Co CA San Benito Co CA Santa Cruz Co CA Santa Cruz Co



### 178- Hour Ozone Unclassifiable/Attainment Areas I-hour Designation Data Region/State 8-hour AttainmentArea 8-hour Attainment Area Counties/Cities/Towns I-Hour Area Designation Status CA SanDiego Co P Thatportion ofSan Diego County that includes the areas SanDiego, CA Serious listedbelow: La Posta Areas #1 and #2 Cuyapaipe Area Maintenance Manzanita Area Campo Areas # 1 and #2 The boundaries for these designated areas are based on coordinates of latitude and longitude derived from EPA Region 9's GIS database and are illustrated in a map entitled "Eastern SanDiego CountyAttainmentAreas for the 8-Hour Ozone NAAQS," dated March 9,2004, including an attached set ofcoordinates. The map and attached set of coordinates are available at EPA's Region 9 Air Division office. The designated areas roughly approximate the boundaries ofthe reservations for these tribes, but their inclusion in this table is intended for CAA planning purposes only and is not intended to be a federal determination ofthe exactboundaries ofthe reservations. Also, the specific listing ofthese tribes in this table does not confer, deny, orwithdrawFederal recognition ofany ofthe tribes so listed nor any ofthe tribes not listed. CA Santa Barbara Co CA Santa Barbara Co Santa Barbara-Santa Serious Maria-Lompoc, CA Maintenance CA Sutter Co P Excluding thatportion ofthe Sutter Buttes mountain Yuba City, CA Section 185A range at or above 2,000 feet inelevation. Nonattainment CA Yuba Co CA Yuba Co NEVADA NVWashoe Co NVWashoe Co Reno,NV Marginal Nonattainment Region 10



### 188- Hour Ozone Unclassifiable/AttainmentAreas I-hour Designation Data Region/State 8-hour AttainmentArea 8-hour AttainmentArea Counties/Cities/Towns I-Hour Area Designation Status OREGON ORMarion Co P ORMarion Co P Salem, OR Incomplete Data Nonattainment ORPolkCoP ORPolkCoP SalemArea SalemArea Transportation Study Transportation Study



### 198- Hour Ozone Unclassifiable/Attainment Areas I-hour Designation Data Region/State 8-hour Attainment Area 8-hour Attainment Area Counties/Cities/Towns I-Hour Area Designation Status WASHINGTON WAKingCoP The following boundary includes all ofPierce County, and all ofKing Seattle-Tacoma, W A Marginal County except a small portion on the northeast corner and the western Maintenance portion ofSnohomish County: Starting at the mouth ofthe Nisqually river extend northwesterly along the Pierce County line to the southernmostpoint ofthe west county line ofKing County; thence northerly along the county line to the southernmost point ofthe west county line ofSnohomish County; thence northerly along the county line to the intersection with SR532; thence easterly along the north line ofSR532 to the intersection of1-5, continuing east along the same road now identified as Henning Rd, to the intersection with SR9 at Bryant; thence continuing easterly on Bryant East Rd. and Rock Creek Rd., also identified as Grandview Rd., approximately 3 miles to the point at which it is crossed by the existing BPAelectrical transmission line; thence southeasterly along the BPA transmission line approximately 8 miles to point ofthe crossing ofthe south fork of the Stillaguamish River; thence continuingin a south-easterly direction in a meander line following the bed ofthe River to Jordan Road; southerly along Jordan Road to the north city limits ofGranite Falls; thence following the north and east city limits to 92nd St. N.E. and Menzel Lake Rd.; thence south-southeasterly along the Menzel Lake Rd. and the Lake Roesiger Rd. a distance ofapproximately 6 miles to the northernmost point ofLake Roesiger; thence southerly along a meander line following the middle ofthe Lake and Roesiger Creek to Woods Creek; thence southerly along a meander line following the bed ofthe Creek approximately 6 miles to the point the Creek is crossed by the existing BPA electrical transmission line; thence easterly along the BPA transmission line approximately 0.2 miles; thence southerly along the BPA ChiefJoseph-Covington electrical transmission line approximately 3 miles to the north line of SR2; thence southeasterly along SR2 to the intersection with the east county line ofKing county; thence south along the county line to the northernmostpoint ofthe east county line ofPierce County; thence along the county line to the point ofbeginning at the mouth ofthe Nisqually River. WAPierce Co WA Pierce Co



### 208- Hour Ozone Unclassifiable/ Attainment Areas I-hour Designation Data Region/State 8-hour Attainment Area 8-hour Attainment Area Counties/Cities/Towns I-Hour Area Designation Status W A Snohomish Co P Snohomish Co The following boundaryincludes all ofPierce County, and all ofKing County except a small portion on the northeast comer and the western portion ofSnohomish County: Starting at the mouth ofthe Nisquallyriver extend northwesterly along the Pierce County line to the southernmost point ofthe west county line ofKing County; thence northerly along the county line to the southernmost point ofthe west county line ofSnohomish County; thence northerly along the county line to the intersection with SR532; thence easterly along the north line ofSR 532 to the intersection of1-5, continuing east along the same road now identified as Henning Rd, to the intersection with SR9 at Bryant; thence continuing easterly on Bryant East Rd. and Rock Creek Rd., also identified as Grandview Rd., approximately 3 miles to the point at which itis crossed by the existing BPA electrical transmission line; thence southeasterly along the BPA transmission line approximately 8 miles to point ofthe crossing ofthe south fork of the Stillaguamish River; thence continuing in a south-easterly direction in a meander line following the bed ofthe River to Jordan I Road; southerly along Jordan Road to the north city limits ofGranite Falls; thence following the north and east city limits to 92nd St. N.E. and Menzel Lake Rd.; thence south-southeasterly along the Menzel Lake Rd. and the Lake Roesiger Rd. a distance ofapproximately 6 miles to the northernmost point ofLake Roesiger; thence southerly along a meander line following the middle ofthe Lake and Roesiger Creek to Woods Creek; thence southerly along a meander line

i following the bed ofthe Creek approximately 6 miles to the point the

I Creek is crossed bythe existing BPAelectrical transmission line; thence easterly along the BPA transmission line approximately 0.2 miles; thence southerly along the BPA ChiefJoseph-Covington electrical transmission line approximately 3 miles to the north line of SR 2; thence southeasterly along SR2 to the intersection with the east countyline ofKing county; thence south along the county line to the northernmostpoint ofthe east county line ofPierce County; thence along the county line to the point ofbeginning at the mouth ofthe Nisqually River. OREGON and OR Clackamas Co P OR Clackamas Co P Portland-Vancouver Marginal WASHINGTON AQMA,OR-WA Maintenance ORMultnomah Co P OR Multnomah Co P 218- Hour Ozone Unclassifiable/Attainment Areas I-hour Designation Data

i Region/State 8-hour Attainment Area 8-hour Attainment Area Counties/Cities/Towns I-Hour Area Designation Status OR Washington Co P OR Washington Co P WAClarkCoP WA Clark Co P Air Quality Maintenance Air QualityMaintenance Area Area

-- -- -- - -- -- - --

22