### State of Wisconsin DEPARTMENT OF NATURAL RESOURCES 101 S. Webster Street Box 7921 Madison WI 53707-7921 Scott Walker, Governor Cathy Stepp, Secretary Telephone 608.266.2621**~~:::I.I::dJ::~""""..A.-"""''''** FAX 608.267.3579 WlSCOHSlN TTY Access via relay. 711 DEPT. OF NATURAL RESOURCES

March 7, 2011

Mr. John Mooney, Acting ChiefofAir Programs Branch U.S. Environmental Protection Agency, Region 5 77 West Jackson Boulevard Mail Code: AR-18J Chicago IL 60604

Subject: Clean Data Determination for the 2006 24-hour Fine Particulate Matter (PM2.5) National Ambient Air Quality Standard (NAAQS)

Dear Mr. Mooney:

The Wisconsin Department ofNatural Resources (WDNR) herby requests the U.S. Environmental Protection Agency (EPA) make a determination that the Milwaukee-Racine nonattainment area has attained the 2006 24- hour PM2

.5 NAAQS and publish that determination in the Federal Register. This request is based on recent measured attainment statewide from Federal Reference Metho<j (FRM) PM2.5 monitors from 2008 through 2010.

Based upon fully quality assured, quality controlled, FRM PM2.5 monitoring data, 98 th percentile 24-hour PM2.5 concentrations and derived design values are presented in the attachment to this correspondence. All PM2

.5 monitors in Wisconsin measured attainment ofthe 24-hour PM2.5 NAAQS for this period with resulting design values of 31.7

- 33.0 Jlg/m3 within the nonattainment area and 16.9

- 35.3 Jlg/m3 statewide. Notably, attainment levels have been achieved throughout the state well in advance ofthe December 2014 statutory deadline.

It is our understanding that a clean data determination by the U.S. EPA for the 2006 24-hour PM2.5 NAAQS suspends the requirement for the WDNR to submit an attainment demonstration and associated reasonably available control measures, reasonable further progress plans, contingency measures, and other planning items related to attainment ofthe PM2.5 NAAQS, in accordance with 40 CFR 51.1004. The WDNR also understands that the suspension ofthese planning requirements can be rescinded ifthe U.S. EPA subsequently issues a finding that the area is no longer attaining the NAAQS.

The measured improvements in PM2.5 air quality are due to a variety of state and federally enforceable control
programs implemented to reduce emissions ofPM2.5 and its precursor pollutants. The WDNR will work collaboratively with the U.S. EPA to develop a redesignation request for the Milwaukee-Racine nonattainment

area over the next several months that further quantifies the achieved emission reductions.

Thank you for considering this request. Ifyou have any questions or need additional information, please contact Joseph Hoch, Regional Pollutant and Mobile Source Section Chief, at 608-267-7543.

dnr.wLgov wisconsin.gov 

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### ATTACHMENT

Summary ofPM bS Ambieut Monitoring Data

All PM2

.5 monitors in Wisconsin measured attainment ofthe 24-hour PM2.5 NAAQS for the period 2008 through 2010. During this period, the design values ranged from 31.7

- 33.0 ).1g/m3 within the nonattainment area and 16.9

- 35.3 ).1g/m3 statewide. The following table summarizes the 24-hour PM2

.5 98th percentile concentrations and resulting design values for the period 2008 through 2010.

Table 

### 1. Statewide 24-Hour PM25 98th Percentile Concentrations and Design Values from 2008

- 2010

A leton Milw-DNR SERHQ Potosi Waukesha Milw-16th CHC LaCrosse Milw-FAAIColle eAve. Madison Perkinstown Manitowoc Devils Lake Ma iIIe I Horicon Harrin ton Beach Somerset Chiwaukee Trout Lake Potawatomi Bad River 550090005 550870009 550790026 550430009 551330027 550790010 550630012 550790058 550250047 551198001 550710007 551110007 550270007 550890009 551091002 550590019 551250001 550410007 550030010 1 1 1 1 2 2 1 1 1 1 1 1 1 1 1

1 1 1 34.6 30.5 27.5 35.2 29.9 27.5 29.2 26.9 32.0 33.0 24.7 24.4 24.7 26.3 24.2 25.8 21.2 15.2 16.0 36.4 33.5 39.0 33.0 32.8 39.1 39.5 33.0 32.1 25.3 33.6 37.8 32.3 31.5 33.9 34.7 24.5 20.4 17.6 35.1 36.6 32.6 30.2 35.9 30.9 28.7 35.3 29.5 32.5 29.5 24.9 29.9 27.6 27.0 23.3 20.9 22.1 17.3 35.3 33.5 33.0 32.8 32.8 32.5 32.4 31.7 31.2 30.2 29.2 29.0 28.9 28.4 28.3 27.9 22.2 19.2 16.9

1 Design Values were developed in accordance with 40 CFR 50 Appendix N Monitors located in the Milwaukee-Racine nonattainment area are identified by bold text. FRM

- Federal Reference Method

Based on this data, the WDNR believes a clean data determination for the Milwaukee-Racine nonattainment area is both reasonable and justified at this time. The WDNR will continue to operate a federally approved FRM PM2

.5 monitoring network in this area to track continued attainment ofthe 2006 24-hour PM2.5 NAAQS.