,~ED SJ4~,

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

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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 your previous monitoring annual network plan, South Coast Air Quality Management District

(SCAQMD) requested EPA’ s approval to consider the 2010-2012 PM2.5 data from your

continuous FEM monitors at the 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-

03 7-4004), Rubidoux (AQS ID: 06-065-800 1), and Mira Loma (AQS ID: 06-065-8005). Your

most recent monitoring annual network plan updates this request to include 2013 data from the

same monitors. This letter is in response to your requests and approves the monitors listed below

for the specified dates as not eligible for comparison to the NAAQS (i.e., provides a waiver for

NAAQS comparability).

According to 40 CFR 58.11(e), in order to 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 monitor and a Class III continuous FEM PM2.5 monitor operating at the

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 document titled “Instructions and Template for Requesting that

data from 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 that the following

monitors do not meet the bias criteria in 53 and, are approved as not eligible for comparison to

the NAAQS for the 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 Paper
Your request stated that you consider the continuous PM2.5 data of sufficient quality to report to

the AQI, and will be submitting the data to AIRNow, so you may now re-load the data from the

monitors and dates in the table above to AQS under the parameter code 88502.

In providing the waiver for the data in the timeframes listed above, EPA expects that SCAQMD

will continue to work to improve the comparability of their continuous PM2.5 FEM monitors and

their filter-based monitors. If SCAQMD intends to submit data from these monitors under a

parameter code other than 88101, an updated analyses of the bias for each FEM monitor should

be included in future annual network plans for a renewed waiver approval.

In addition, since the intent of such a waiver is to allow more time for method and operational

improvements to meet the required bias, SCAQMD must develop a performance assessment and

improvement plan to be approved by EPA that describes how the agency will track the

performance of these monitors on a quarterly or more frequent basis, as well as the activities

SCAQMD intends to take to address any continuing performance issues.

If you have any questions regarding this letter or the 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