€0 ST 4 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY______ REGION IX 75 Hawthorne Street 4 L pO

San FJ ‘tr 1 th3 94105 Mr. Mike Sword Engineering Manager, Engineering Division Clark County Department of Air Quality 4701 W. Russell Road, Suite 200- 2nd Floor Las Vegas, Nevada 89118 Dear Mr. Sword: This letter provides EPA’s review and approval for the Clark County Department of Air Quality’s (DAQ’s) discontinuation
of State/Local Air Monitoring Station (SLAMS) monitors
at the following sites:— Lone Mountain (Site ID: 3 2-003-0072): PM 10 monitor.— Off (Site ID: 32-003-1021): PM 10 and CO monitors. On April 22, 2010 DAQ provided EPA with a description of these network changes. DAQ also documented these discontinuations

in their Annual Monitoring Network Plan submitted
to EPA in 2011. The plan was made available for public inspection prior to its submittal
to EPA and no public comments were received. Per 40 CFR 58.14, monitoring agencies are required to obtain EPA approval for the discontinuation

of SLAMS monitors. Each of these monitor discontinuations were specifically reviewed by EPA against 40 CFR 58.14(c)(1) criteria. According
to certified data submitted
to EPA’s Air Quality System (AQS), all three monitors show attainment for the 2005-2009 period. Wè have determined that there is a less than 10 percent probability of exceeding 80 percent of each of their applicable NAAQS (National Ambient Air Quality Standards) during the next three years (2010-2012)

at these sites. These monitors are not specifically required by an attainment
or maintenance plan and are not the only SLAMS monitors of their kind operating
in a nonattainment

or maintenance area. Concentrations captured for a portion of 2010 continue to show low values. Furthermore, DAQ continues
to operate more than the minimum required SLAMS sites for PM 10 and CO as described
in 40 CFR 58, Appendix D. Based on this, EPA approves DAQ’s discontinuation

of the SLAMS monitors identified above.If there are any questions regarding this 1etter, please feel free to contact me at (415) 972-3851 or Elfego Felix of my staff at (415) 947-4141. Sincerely, Matthew Laldn, Manager Air Quality Analysis Office Enclosure: AQS query dated May 17, 2013 cc: YousafHameed, DAQ

0

### UNITEDSTATES E 1PIMENTALPROTECTIONAGENCY 

# o UserID: EFX QUICKLOOKCRITERIAPARANETERS ReportRequest ID: 1099362 Report Code: ANP45O GEOGRAPHICSELECTIONS Tribal EPA

Code State County Site Parameter POC City AQCR UAR CBSA CSA Region Method Duration BeginDate 32 003 0072 81102 32 003 1021 81102 32 003 1021 42101 SELECTEDOPTIONS SORTORDER 

### OptionType OptionValue 

# j[Order Column WORKFILEDELIMITER

, 

### 1 PARANETER_CODE

MERGEPDFFILES YES 2 STATE_CODE EVENTS PROCESSING INCLUDEEVENTS 3 COUNTY_CODE 4 SITE_ID 

### 5 POC 6 DATES 7 EDT_ID

CO 8-hour 1971 PM1O 24-hour2006 May. 17, 2013



# r GLOBALDATES 

# L StartDate EndDate 2005 2010 APPLICABLESTANDARDS StandardDescription CO 1-hour 1971

SelectionCriteriaPage 1UNITED STATES ENVIRONMENTALPROTECTIONAGENCY AIRQUALITY SYSTEM QUICKLOOKREPORT (ANP4SO) May. 17, 2013 EXCEPTIONALDATATYPES 

# LEDT DESCRIPTION 0 NO EVENTS 1 EVENTS EXCLUDED 2 EVENTS INCLUDED 5 EVENTS WITH CONCURRENCEEXCLUDED

4.

Note: The * 

### indicates that the mean does not satisfy summary criteria. 

### Page 1 of 5UNITED STATES ENVIRONMENTALPROTECTIONAGENCY AI)LITYSYSTEM 

# (__) QUICK

### Ib REPORT (A14P450) May. 17, 2013 Carbonmonoxide (42101) Nevada Partspermillion (007) P 1ST 2ND 

### OHS 1ST 2ND 

### OBS o MAX MAX >1HR MC MAX >8HR SITE ID C PQAO CITY COUNTY ADDRESS YEAR METH OHS 1-HR 1-HR $fl) 8-HR 8-HR STD CERT EDT 32-003-1021 1 0226 Las Vegas Clark 1562 KATIEAVE 

### 2006 093 8688 5.1 5.0 0 4.2 3.8 0 Y 0 32-003-1021 1 0226 LasVegas Clark 1562 KATIEAVE 

### 2006 093 8479 4.8 4.7 0 3.9 3.7 0 0 32-003-1021 1 0226 LasVegas Clark 1562 KATIEAVE 

### 2007 093 8652 4.5 4.1 0 3.4 2.9 0 0 32-003-1021 1 0226 Las Vegas Clark 1562 KATIEAVE 

### 2008 093 8359 3.2 3.2 0 2.6 2.6 0 0 32-003-1021 1 0226 LasVegas Clark 1562 KATIEAVE 

### 2009 093 8405 3.4 3.2 0 2.8 2.6 0 0 32-003-1021 1 0226 LasVegas Clark 1562 KATIEAVE 

### 2010 093 2669 3.2 3.0 0 2.7 2.7 0 0

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### indicatesthatthemeandoes not satisfysummarycriteria. Page 

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## 5UNITED STATES ENVIRONMENTAL PROTECTIONAGENCY AIRQUALITY SYSTEM QUICKLOOKREPORT (ANP45O)

NUM VALID ADDRESS YEAR METh #OBS REQ IDAYS %OBS 3525 N 2005 000 336 365 336 VALADEZ STREET 3525 N VALADEZ STREET 3525 N VALADEZ STREET 3&25 N VALADEZ STREET 3525 N VALADEZ STREET 3525 N VPLADEZ STREET 1562 KATIE AVE 1562 KATIE AVE 1562 KATIE AVE 1562 KATIE AVE AVE 32-003-1021 1 0226 Las Vegas Clark 1562 KATIE 2010 150 2663 365 112 31 34 33 33 33 0 0 15.8* 0 AVE

Note: The * indicates that themean does not satisfy summary criteria. 

# 0 Page 3 of5 Nevada May. 17, 2013 PM1O Total 0-lOumSTP (81102) Micrograms/cubicmeter (25 C) (001)

24-HOUR P . ‘ DAYEST WTD 0 1ST 2ND 3ED 4TH MAX DAYS ARITH ITZID C PQAO CITY

- - COUNTY

- MAX MAX MAX MAX >STD>STD MEANCERTEDT 32-003-0072 1 0226 Las Vegas Clark 92 55 52 49 47 0 0 19.8 Y 0

32-003-0072 10226 Las Vegas Clark 2006 150 338 365 338 93 82 69 67 55 0 0 20.5

32-003-0072 1 0226 Las Vegas Clark 2007 150 312 365 312 85 55 52 50 47 0 0 19.8*

32—003-0072 1 0226 Las Vegas Clark 2008 150 328 366 328 90 70 59 58 56 0 0 19.0

32-003-0072 1 0226 Las Vegas Clark 2009 150 8647 365 363 99 69 50

- 50 44 0 0 16.5

32-003-0072 1 0226 Las Vegas Clark 2010 150 2726 365 115 32 28 28 25 24 0 0 12.1*

32-003-1021 1 0226 Las Vegas Clark 2005 000 334 365 334 92 75 71 67 64 0 0 30.1
32-003-1021 1 0226 Las Vegas Clark 2006 150 340 365 340 93 94 75 66 64 0 0 28.5 32-003-1021 1 0226 Las Vegas Clark 2007 150 332 365 332 91 103 76 66 64 0 0 26.8 32-003-1021 1 0226 Las Vegas Clark 2008 150 329 366 329 90 71 70 68 66 0 0 28.0 32-003-1021 1 0226 Las Vegas Clark 0

0

0

0

0

Y 0 0 0 0 0 1562 KATIE 2009 150 8664 365 363 99 85 75 71 71 0 0 22.7UNITED STATES ENVIRONMENTALPROTECTIONAGENCY 

# C

. 

### AI ITtSYSTEM QUICK REPORT (AMP45O) May. 17, 2013 METHODSUSEDINTHIS REPORT METHOD PARANETER CODE COLLECTIONMETHOD 

### ANALYSIS METHOD 42101 093 INSTRUMENTAL GAS FILTERCORRELATIONCOANALYEER 81102 000 MULTIPLEMETHODS MULTIPLEMETHODS 81102 150 TA Series FH 

### 62 C14 Continuous BetaAttenuation

Note: The * indicates that the meandoes

- not satisfy summary criteria. Page

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## 5UNITED STATES ENVIRONMENTALPROTECTIONAGENCY AIRQUALITY SYSTEM QUICKLOOKREPORT (Ar4P450) 

### May. 17, 2013

PQAOSUSED INTHIS REPORT

AGENCYDESCRIPTION ___ _____



### 0226 ClarkCounty, NVDAQEM



### Note: The * 

### indicates that themeandoes not satisfy summarycriteria. Page 

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