Tom: 

We have received several comments on the purging specifications. 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. For your information, the comment period will be reopened. 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 (and 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 comment. 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 temperature to be monitored and maintained at <68F during 

the post-test purge to prevent loss of moisture. If the impingers are weighed for moisture gain prior to the purge, 

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/minute 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 be 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 the 

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

Subject RE: Fw: OTM-28

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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.greene@erg.com

Subject: Re: Fw: OTM-28 

 

Tom: 

I thought that I had respondid to this question a few times but don't remember 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 that exceeded 200 ml due to concerns 

about not recovering all the materials. I have copied this to Ray Merrill, 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

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Candace,

Iâm sending this to you as the M202 contact. Thereâs no OTM-28 contact I could find. Please 

forward if youâre not the one.

Are there assumed rinse volumes for water, acetone and methylene chloride in OTM-28? This 

is related to blank-correction. OTM-28 puts a limit on blank-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 more 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 

=

 

Subject OTM-28

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