Mr. Mike Sword

Engineering Manager, Engineering Division

Clark County Department ofAir 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): PM10monitor.

— Off (Site ID: 32-003-1021): PM10 and CO monitors.

On April 22, 2010 DAQ provided EPA with a description ofthese network changes. DAQ also documented these discontinuations in their Annual Monitoring Network Plan submitted to EPAin 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 ofthese 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 oftheir 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 oftheir 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 PM10 and CO as described in 40 CFR 58, Appendix D. Based on this, EPA

approves DAQ’s discontinuation of the SLAMS monitors identified above.
Matthew Laldn, Manager

Air Quality Analysis Office

Enclosure: AQS query dated May 17, 2013cc: YousafHameed, DAQ

0
UNITED STATES E 1PIMENTAL PROTECTION AGENCY

o

User ID: EFX QUICKLOOK CRITERIA PARANETERS

Report Request ID: 1099362 Report Code: ANP45O

GEOGRAPHIC SELECTIONS

Tribal

EPA

Code State County Site Parameter POC City AQCR UAR CBSA CSA Region Method Duration Be

32 003 0072 81102

32 003 1021 81102

32 003 1021 42101

SELECTED OPTIONS

SORT ORDER

Option Type Option Value j [Order Column

WORKFILE DELIMITER , 1 PARANETER_CODE

MERGE PDF FILES YES 2 STATE_CODE EVENTS PROCESSING INCLUDE EVENTS

3 COUNTY_CODE

4 SITE_ID

5 POC

6 DATES

7 EDT_ID

CO 8-hour 19

PM1O 24-hour 

r GLOBAL DATES

L Start Date End Date

2005 2010

APPLICABLE STAN

Standard Descr

CO 1-hour 19

Selection Criteria Page 1
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

AIR QUALITY SYSTEM

QUICK LOOK REPORT (ANP4SO)

EXCEPTIONAL DATA TYPES

LEDT DESCRIPTION

0 NO EVENTS

1 EVENTS EXCLUDED

2 EVENTS INCLUDED

5 EVENTS WITH CONCURRENCE EXCLUDED

4.

Note: The * indicates that the mean does

not satisfy summary criteria. Page 1 of 5
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

AI)LITY SYSTEM

QUICK Ib REPORT (A14P450)

Carbon monoxide (42101) Nevada 

P

1ST 2ND OHS 

o MAX MAX >1HR 

SITE ID C PQAO CITY COUNTY ADDRESS YEAR METH OHS 1-HR 1-HR $fl) 

32-003-1021 1 0226 Las Vegas Clark 1562 KATIE AVE 2006 093 8688 5.1 5.0 0 

32-003-1021 1 0226 Las Vegas Clark 1562 KATIE AVE 2006 093 8479 4.8 4.7 0 

32-003-1021 1 0226 Las Vegas Clark 1562 KATIE AVE 2007 093 8652 4.5 4.1 0 

32-003-1021 1 0226 Las Vegas Clark 1562 KATIE AVE 2008 093 8359 3.2 3.2 0 

32-003-1021 1 0226 Las Vegas Clark 1562 KATIE AVE 2009 093 8405 3.4 3.2 0 

32-003-1021 1 0226 Las Vegas Clark 1562 KATIE AVE 2010 093 2669 3.2 3.0 0 

Note: The * indicates that the mean does

not satisfy summary criteria.

Page 2 of 5
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

AIR QUALITY SYSTEM

QUICK LOOK REPORT (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 

AVE

Note: The * indicates that the mean does

not satisfy summary criteria.

0

Page 3 of 5

Nevada

PM1O Total 0-lOum STP (81102) Mic

24-HOUR

P . ‘ 

0

1ST 2ND 3E

ITZID C PQAO CITY - - COUNTY -

MAX MAX M

32-003-0072 1 0226 Las Vegas Clark 92 55 52 

32-003-0072 10226 Las Vegas Clark 2006 150 338 365 338 93 82 69 

32-003-0072 1 0226 Las Vegas Clark 2007 150 312 365 312 85 55 52 

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

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

32-003-0072 1 0226 Las Vegas Clark 2010 150 2726 365 115 32 28 28 

32-003-1021 1 0226 Las Vegas Clark 2005 000 334 365 334 92 75 71 

32-003-1021 1 0226 Las Vegas Clark 2006 150 340 365 340 93 94 75 

32-003-1021 1 0226 Las Vegas Clark 2007 150 332 365 332 91 103 76 

32-003-1021 1 0226 Las Vegas Clark 2008 150 329 366 329 90 71 70 

32-003-1021 1 0226 Las Vegas Clark

1562 KATIE 2009 150 8664 365 363 99 85 75 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

C .

AI ITt SYSTEM

QUICK REPORT (AMP45O)

METHODS USED IN THIS REPORT

METHOD

PARANETER CODE COLLECTION METHOD ANALYSIS METHOD

42101 093 INSTRUMENTAL GAS FILTER CORRELATION CO ANAL

81102 000 MULTIPLE METHODS MULTIPLE METHODS

81102 150 T A Series FH 62 C14 Continuous Beta Attenuation

Note: The * indicates that the mean does -

not satisfy summary criteria. Page 4 of 5
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

AIR QUALITY SYSTEM

QUICK LOOK REPORT (Ar4P450)

PQAOS USED IN THIS REPORT

AGENCY DESCRIPTION

___ _____

0226 Clark County, NV DAQEM

Note: The * indicates that the mean does

not satisfy summary criteria. Page 5 of 5

0