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 Chief ofAir 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 of Natural 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, 98th 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that the suspension ofthese planning requirements can be rescinded if the U.S. EPA subsequently issues a finding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 ofstate and federally enforceable control

programs implemented to reduce emissions of PM2.5 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. If you 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 Naturally WISCONSIN

e~1Uc"t-"--"

fAir Manageme /
ATTACHMENT

Summary ofPMbS 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.