,~ED SJ4~, UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

%~ <~ REGION IX

~ 75 Hawthorne Street San FrancStp, (~j~-39O1

Jason Low, Ph. D South Coast Air Quality Management District 21865 Copley Drive Diamond Bar, California 91765-4178 Dear Mr. Low:
In yourprevious monitoring annual network plan, South CoastAir Quality Management District (SCAQMD) requested EPA’s approval to considerthe 2010-2012 PM2.5 datafrom your continuous FEM monitors atthe following sites as not eligible for comparison to the NAAQS: Anaheim (AQS ID: 06-059-0007), Burbank (AQS ID: 06-037-1002), Central Los Angeles (AQS ID 06-037-1103), North Long Beach (AQS ID: 06-037-4002), South Long Beach (AQS ID: 06- 037-4004), Rubidoux (AQS ID: 06-065-8001), and Mira Loma (AQS ID: 06-065-8005). Your most recent monitoring annual network plan updates this requestto include 2013 data from the same monitors. This letter is in responseto your requests and approves the monitors listed below forthe specified dates as not eligible for comparison to the NAAQS (i.e., provides awaiverfor NAAQS comparability). According to 40 CFR 58.11(e), in orderto be considered not eligible for comparison to the NAAQS, continuous FEM PM2.5 data must be shown to not meet the criteria in 40 CFR 53 Table C-4. These criteria describe the maximum allowable multiplicative and additive bias between filter-based FRM PM2.5 monitorand a Class III continuous FEM PM2.5 monitoroperating atthe same site. EPA based its evaluation on the criteria in 40 CFR 53 as described by our memo dated April 20, 2013 and its attached documenttitled “Instructions and Template for Requesting that datafrom PM2.5 Continuous FEMs are not compared to the NAAQS.” We reviewed your request for 2010-2012 data, and well as your updated request for 2011-2013 data. After reviewing the information in your requests, we have determined thatthe following monitors do not meet the bias criteria in 53 and,are approved as not eligible for comparison to the NAAQS forthe noted time periods: Site Name AQS ID-Parameter Code-POC Begin Date End Date Anaheim 06-037-0007-3 01/01/2010 12/31/2013 Burbank 06-037-1002-3 01/01/2010 12/31/2013 Central Los Angeles 06-037-1 103-3 01/01/2010 09/29/2011 Central Los Angeles 06-037-1 103-9 10/01/2011 12/31/2013 North Long Beach 06-037-4002-3 01/01/2010 12/31/2013 South Long Beach 06-037-4004-3 01/01/2012 12/31/2013 Rubidoux 06-065-8001-3 01/01/2010 07/31/2011 Rubidoux 06-065-8001-9 08/02/201 1 12/31/2013 Mira Loma 06-065-8005-3 01/01/2010 12/31/2013

Printed on Recycled PaperYourrequest stated that you considerthe continuous PM2.5 data ofsufficient qualityto report to

the AQI, and will be submittingthe datato AIRNow, so you may now re-load the datafrom the monitors and dates in the table above to AQS underthe parameter code 88502. In providing the waiver forthe data in the timeframes listed above, EPA expects that SCAQMD will continue to workto improve the comparability oftheircontinuous PM2.5 FEM monitors and theirfilter-based monitors. IfSCAQMD intends to submit datafrom these monitors undera parametercode otherthan 88101, an updated analyses ofthe bias foreach FEM monitor should be included in future annual network plans for a renewed waiver approval. In addition, since the intent ofsuch awaiver is to allow more time formethod and operational improvementsto meetthe required bias, SCAQMD must develop a performance assessment and improvement plan to be approved by EPAthat describes howthe agencywill trackthe performance ofthese monitors on a quarterly or more frequent basis, as well as the activities SCAQMD intends to take to address any continuing performance issues. Ifyou have any questions regarding this letterorthe enclosure, please feel free to contact me at (415) 947-4534 or Michael Flagg at (415) 972-3372. Sincerely, 

# ~t~fk~iv~

dith Kurpius, Ma ger Air Quality Analysis Office Air Division

Enclosures

cc: Andrea Polidori, SCAQMD