janice K. Brewer 

Governor 

JUL 132009 

ARIZONA DEPARTMENT 

OF 

ENVIRONMENTAL QUALITY 

1110 West Washington Street • Phoenix, Arizona 85007 

(602) 771-2300 • www.azdeq.gov 

Ms. Laura Y oshii, Acting Regional Administrator 

U.S. Environmental Protection Agency, Region IX 

Mail Code: ORA-l 

75 Hawthorne Street 

San Francisco, CA 94105 

Benjamin H. Grumbles 

Director 

RE: Maintenance of the PM10 NAAQS and Limited Maintenance Plan design values for the Payson 

PM10 maintenance area- 2004 - 2008 

Dear Ms. Y oshii: 

The purpose of this letter is to provide EPA 2008 monitoring data for the Payson PM10 maintenance area 

in order to: 

1. Demonstrate that the area continues to meet the PM10 national ambient air quality standards 

(NAAQS), and 

2. Demonstrate that the area continues to meet the design value criteria for a Limited 

Maintenance Plan (LMP). 

On February 7, 2002, the Arizona Department of Environmental Quality (ADEQ) submitted a LMP for 

the Payson PM10 nonattainment area and a request for redesignation to attainment. Effective August 26, 

2002 ( 67 FR 43020; June 26, 2002), EPA redesignated Payson to attainment for the 24-hour and revoked 

annual PM10 NAAQS. As part of the LMP, ADEQ committed to monitor the area's air quality and 

submit annual reports to EPA regarding the air quality status of the Payson area. 

The accompanying analysis demonstrates that the Payson PM 10 maintenance area continued to meet the 

LMP design value criteria in 2008 (see Enclosure 1). The ambient air concentrations, attached as 

Enclosure 2, demonstrate that the Payson PM 10 maintenance area continued to meet the 24-hour PM 10 

NAAQS in 2008. This analysis is based on the five years of monitoring data beginning in 2004 and 

ending in 2008. Payson continues to qualify for a LMP. 

Northern Regional Office 

1801 W. Route 66 • Suite 117 • Flagstaff, A2 86001 

(928) 779-0313 

Southern Regional Office 

400 West Congress Street • Suite 433 • Tucson, AZ 85701 

(520) 628-6733 

Printed on recycled paper 
Ms. Yoshii 

Page 2 of2 

If you have any questions regarding this submittal, please contact Nancy Wrona, Director, Air Quality 

Division, at (602) 771-2308 or Diane L. Arnst, Air Quality Planning Section Manager, at (602) 771-2375. 

7J·nc elx ;!li 

/ /~(i~! ~to~ Benjamin .~ (/ H. '~ Grumbles 

Director 

Enclosures (2) 

cc: The Honorable Shirley Dawson, Chairman, Gila County Board of Supervisors 

The Honorable Kenny Evans, Mayor, Town of Payson 

Colleen McKaughan, EPA Region IX 

Wienke Tax, EPA Region IX 

Ray Erlandsen, Acting Community Development Director, Town of Payson 

Debra Galbraith, Town Manager, Town of Payson 

Steven Besich, Gila County 

Joe Mendoza, Gila County 
Payson 2004-2008 PM10 Design Values and 

Demonstration for Continued Eligibility of Limited Maintenance Plan 

Arizona Department of Environmental Quality 

Air Quality Division 

Ill 0 West Washington 

Phoenix, AZ 85007 

June 23, 2009 
This page is intentionally blank. 
Summary 

EPA's Limited Maintenance Plan (LMP) Option for Moderate PM10 Nonattainment Areas 

guidance requires an annual demonstration of the 24-hour PM10 Design Value (DV) for each LMP 

area to determine if the area continues to meet the eligibility requirements for an LMP rather than 

a full maintenance plan. 

Data from the five year period 2004-2008 were used to determine continued eligibility for the 

Payson PM10 Maintenance Area. Data from this period demonstrate that Payson continued to 

meet EPA's 24-hour PM10 Standard in 2008. 

Procedure 

The Air Quality System (AQS) database is checked to verify that sample data for each year of the 

selected period have been reported to the AQS. To satisfy EPA requirements, data completeness 

for each calendar quarter must be 75 percent or greater. If data completeness is between 50 

percent and 75 percent for any quarter, a substitution procedure may be followed to enable use of 

the data for LMP compliance demonstration (see EPA's Guideline on Exceptions to Data 

Requirements for Determining Attainment of the Particulate Matter Standards.) If data 

completeness is less than 50 percent, use of data substitutions is prohibited. 

Calculations should be based on the most recent five years of monitoring data, for this report the 

five-year period spans 2004-2008. Data from this period are then categorized into three-year 

periods, in this case 2004-2006, 2005-2007, and 2006-2008. To determine eligibility, data 

completeness for each of the three-year periods must be verified. After completeness has been 

verified, the highest 24-hour sample for each calendar quarter is identified. The highest sample of 

the four calendar quarters is then identified. Next, the highest sample for each year in the threeyear period is identified. The highest of the three samples is then identified as the period's DV 

and selected for testing against the LMP limit, 98 ug/m3

• 

If the DV is equal to or less than 98 ug/m3

, the maintenance area continues to qualify as an LMP. 

If the DV exceeds this limit, then the site-specific Critical Design Value (CDV) must be 

calculated (see Attachment A of the LMP guidance). If the DV is less than the CDV, the 

maintenance area still qualifies as an LMP. 

Results 

The highest 24-hour PM10 values for each three-year period are listed in Table I. The DV for the 

5-year period of record is 81ug/m3

, below the 98 ug/m3 criteria used to qualifY for a LMP. 

Therefore, Payson remained eligible for LMP status in 2008. 
References 

1. EPA. Guideline on Exceptions to Data Requirements for Determining Attainment of the 

Particulate Matter Standards, 1987. 

2. Chu, Shao-Hang, "Attachment A. Critical Design Value Estimation and Its Applications", 

EPA Memorandum: Limited Maintenance Plan Option for Moderate PM10 Nonattainment Areas. 

J. J 
. 

No. of ···. . No. of 

':r.lfea~ _Quarter Days in Possibl~ · 

. . •: Quarter . Samples,' ... · .. ',','.!!:·:::i·:"'·:'·"'" 

1 91 15 

2 91 15 

2004 3 92 16 

4 92 15 

Annual 61 

. ··.······· 

·. . . . 

1 90 15 

2 91 16 

2005 3 92 15 

4 92 16 

Annual 62 . ··:. 

1 "' 90 15 

2 91 15 

2006 3 92 15 

4 92 17 

Annual 62 

Payson 24-honr PM10 Standard Design V aloes 

Three-Year Period Summary Statistics 

AQS # 04-007-0008 AAAD # 16317 

. · . .. 

No. Of Average 2nd %Data __ Max24-hr. "Actual C~rqp~~e_ness PM1o .• ,,~f~ple Highest 

·'samples . ..... (ug/m'3) .. ,, ,, ... ,.,, Sample 

2004-2006 Design Values 

15 100 15.7 37 32 

14 93 19.4 32 24 

14 88 20.4 53 49 

14 93 20.6 36 30 

57 93 19.0 53 49 

No. of 

Actual 

Exceedances 

. ... · ··. 

0 

0 . 0 

0 

0 . .. · ::,: __ ' ' .. . ·. . . . .... '.· .. · . 

7 47 22.9 81 24 0 

15 94 19.7 33 29 0 

14 93 19.6 33 30 0 

14 88 26.2 47 47 0 

50 81 0 .................. , .· ... 15 100 32.3 66 62 0 

15 100 21.4 32 29 0 

14 93 14.6 41 22 0 

16 94 26.3 43 40 0 

60 97 23.7 66 62 0 

2004-2006 Design Value= 

.. . .. . 3-year Max 24-hr. 

Annual ---- Sample in 

Average 3-Year Period 

. . . . ..... · .. 

* 81 

• EPA guidelines prohibit the use of data substitutions when completeness for a quarter is less than 50%. Calculation of the three-year 

annual average is not possible with incomplete data. 

For 01 2005, less than 50% data completeness, use of substitutions is not an option. 

For 02 2005, extra run on 6/13/05, so possible samples 16 instead of the scheduled 15. 

For 04 2006 extra run on 11/15/06, so possible samples 17 instead of the scheduled 16. 

~--------··-----··------------- ----., 
' "" 2 ··~. 

r~~:;~ear ... 

No. of No, of 

Quarter Days in Possible 

Quart~r. Samples 

" .· 

--· .. 

' 

1 90 15 

2 91 16 

2005 3 92 15 

4 92 16 

Annual 62 

,.,.:·",' 

1 90 15 

2 91 15 

2006 3 92 15 

4 92 17 

Annual 62 ,' ... ,,,';.;;,,,.,,,,.,, •,:' ', ,; ·_:, " 

1 90 15 

2 91 15 

2007 3 92 16 

4 92 15 

Annual 61 

Payson 24-honr PM10 Standard Design Valnes 

Three-Year Period Snmmary Statistics 

AQS # 04-007-0008 AAAD # 16317 

.:,, ... ,.,.;;'·:::·:':·:,::.::::· .... ," 

No. Of '2ild 

% Oat~ .... : .. ~.:··:.::,:· .. : 1:· 

::Average .Max 24-hr,, Actual 'pM,o ",sample Highest::·""''' CC!m.R,I,~~eness Samples (uglnr'3) Sample , 

" " 

2005-2007 Design Values 

7 47 22.9 81 24 

15 94 19,7 33 29 

14 93 19.6 33 30 

14 88 262 47 47 

50 81 

"> ·.·. 

15 100 32,3 66 62 

15 100 21A 32 29 

14 93 14,6 41 22 

16 94 26,3 43 40 

60 97 23,7 66 62 .-.. - .. 

14 93 22,2 43 31 

15 100 23,5 62 34 

15 94 1R8 32 31 

15 100 27,8 41 39 

59 97 23,1 62 43 

,, ",:·:·,, .. : '.'''·:·.:.··'::·::':::·,:.:, ' Max 24-hr, # .. ()f.r::·':::· , , 3-year Sample in Acwal . Annual 

- Exc;Eiecfances: A~~~·;;,, 3-Year 

" " : ~~riod 

0 

0 

0 

0 

0 

" "<" ·-·· 

0 

0 

0 

0 

0 

. . . ' ,,,; " ,, . '' '" '"' " " 

0 

0 

0 

0 

0 

2005-20P7 Design Value = • 81 

* EPA guidelines prohibit the use of data substitutions when completeness for a quarter is less than 50%, Calculation of the three-year 

average is not permitted with incomplete data. 

For 01 2005 data completeness is less than 50%; EPA guidelines prohibit data substitutions when completeness is less than 50%, 

For 02 2005 extra run on 6/13/05, so possible samples 16 instead of the scheduled 15, 

For 04 2006 extra run on 11/15/06, so possible samples 17 instead of the scheduled 16, ---
~~~!! . '~ : ··.· .. 

No. of N<>- of .r.e~r,: · Quarter Days in Possible· 

. Quarter S~!)lples 

1 90 15 

2 91 15 

2006 3 92 15 

4 92 17 

Annual 62 . ,. 

1 90 15 

2 91 15 

2007 3 92 16 

4 92 15 

Annual 61 . ; .. . . ,,,. 

1 91 16 

2 91 15 

2008 3 92 15 

4 92 15 

Annual 61 

Payson 24-hour PM10 Standard Design Values 

Three-Year Period Summary Statistics 

AQS # 04-007-0008 AAAD # 16317 

J . .:.. 2nd No. Of % Data 

.PM,. 

Average ~,yt~' Hi!Jhesl Actual .. . ~om~leten'l (U!jl("~ ): :sarrtPI~.,; ,,:::· SamJ<]~s·• Sample .· 

2006-2008 DESIGN VALUES 

15 100 32.3 66 62 

15 100 21.4 32 29 

14 93 14.6 41 22 

16 94 26.3 43 40 

60 97 23.7 66 62 

.No; of Actual 

••Exceedances 

·.· •·····' 

0 

0 

0 

0 

0 

),''-'' ·: : ·' .. . .... . .. · ,,., 

14 93 22.2 43 31 0 

15 100 23.5 62 34 0 

15 94 18.8 32 31 0 

15 100 27.8 41 39 0 

59 97 23.1 62 43 0 ' .. · · .. ._,, .. , .. ,,,,:,::· .. · . ·,' ,, ... ·''' ,,:,• . 

14 88 22.3 32 30 0 

15 100 25.3 43 38 0 

15 100 14.2 20 17 0 

15 100 25.5 39 39 0 

59 97 21.8 43 39 0 

2006-2008 Design Value= 

For Q4 2006 extra run on 11115106, so possible samples 17 instead ofthe scheduled 16. 

3-year Max24-hr.: •• 

Annual Sample in 3-

ft.verage Year Period 

,, 

.·. ,,,,, ... 

. 

23 66