Tom:

We have received several comments on the purging specificati ons. I'm not sure exactly how we will revise the method, but if you have already determined the amount of moisture collected, you don't really need to purge through the impingers following the back up filter. F or your information, the comment period will be reope ned. If you have suggestions for revising the method (even if only to make it more clear) Please submit your

recommendations to the docket.

I believe that the easiest way to submit comments to the docket (a nd one that has a backup as well) is to send your comments via e-mail to a-and-rdocket@epa.gov. In the Subject, include the phrase "Docket ID No. EPAHQOAR20080348". It would not hurt to also include the FR proposal title "Methods for

Measurement of Filterable PM10 and PM2.5 and Measurement of Condensable Particulate Matter Emissions from Stationary Sources" at the beginning of the body of the comm ent. Your back up would be to add me as a cc to your comment submission.

_________________________________ Ron Myers U.S. Environmental Protection Agency Office of Air Quality Planning and Standards Sector Policy and Programs Division Monitoring Policy Group, D243-05
RTP NC 27711

Tel. 919.541.5407

Fax 919.541.1039 E-mail myers.ron@epa.gov

Ron,

I have more OTM-28 questions.

Section 8.5.3 requires the silica-gel impinger outlet t emperature to be monitored and maintained at <68F d uring the post-test purge to prevent loss of moisture. If the i mpingers are weighed for moisture gain prior to the p urge, do these conditions still have to be maintained during the purge?

The purge flow and equipment configuration seems a bit ambiguous. Section 8.5.3.3 requires the N2 flow to be

either the delta-H-at of the meterbox or 20 liters/mi nute and show a bypass ahead of the impingers. Figure 2 shows the impinger train connected to a meterbox and a high-range rotometer that’s labeled for use when pushing N2 through the impingers. Does the N2 have to b e pulled through the impingers? If N2 can be pushed through, is the meterbox needed? If N2 can be pushed, what is the purpose of the bypass rotometer ahead of th e impinger train?

Thanks again.

Thomas F. Mattei "Tom Mattei" <tmattei@avogadro.net>

06/01/2009 10:42 AM To Ron Myers/RTP/USEPA/US@EPA

cc
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...Avogadro Environmental Corporation

From: Myers.Ron@epamail.epa.gov [ mailto:Myers.Ron@epamail.epa.gov ]

Sent: Monday, April 27, 2009 1:28 PM

To: Sorrell.Candace@epamail.epa.gov

Cc: Dewees.Jason@epamail.epa.gov; tmattei@avogadro.net ; Mcalister.Gary@epamail.epa.gov; ray.merrill@erg.com; joe.fanjoy@erg.com; danny.gree ne@erg.com Subject: Re: Fw: OTM-28

Tom:

I thought that I had respondid to this question a few times but don't remembe r my exact answer. If my memory serves me correctly, about 200 ml of solvents were used for the rinses. One of the comments that was made by New Jersey was to prorate the blank correction to accomodate source testers that were more frugal with their recovery rinses and those source testers tha t exceeded 200 ml due to concerns about not recovering all the materials. I have copied this to Ray Me rrill, Jason Dewees and others on the team to correct any statements that I have made. If you believe that we should revise the wording in the method to clarify this issue in the final Method 202, I would suggest that you formulate the comment, provide some supportning rationale and supporting data if available.

_________________________________ Ron Myers U.S. Environmental Protection Agency Office of Air Quality Planning and Standards Sector Policy and Programs Division Monitoring Policy Group, D243-05

RTP NC 27711

Tel. 919.541.5407

Fax 919.541.1039 E-mail myers.ron@epa.gov

Candace Sorrell/RTP/USEPA/US

04/27/2009 12:44 PM

To Ron Myers/RTP/USEPA/US@EPA, Jason Dewees/RTP/USEPA/ US@EPA

cc tmattei@avogadro.net

bcc

Subject Fw: OTM-28

----- Forwarded by Candace Sorrell/RTP/USEPA/US on 04/27/2009 12:44 PM -----

"Tom Mattei" <tmattei@avogadro.net>

04/27/2009 12:37 PM

To Candace Sorrell/RTP/USEPA/US@EPA

cc Page 2 of 3

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...Candace,

Iâm sending this to you as the M202 contact. Thereâs no OT M-28 contact I could find. Please forward if youâre not the one.

Are there assumed rinse volumes for water, acetone and me thylene chloride in OTM-28? This is related to blank-correction. OTM-28 puts a limit on b lank-correction of 2 milligrams, regardless of rinse volumes.

Method 5 and 202 put restrictions on the blank-correction by way of blank contamination concentration. Thus, the higher the rinse volume, the mo re milligrams that can be subtracted from the sample.

Thanks.

Thomas F. Mattei Operations Manager Avogadro Environmental Corporation

1350 Sullivan Trail

Easton PA 18040 phone: 610-559-8776 ext 103

fax: 610-559-8913 tmattei@avogadro.net

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