DEQ-CFW_00072932

Sadosky, Rebecca
Subject: Gen X Treatment Technologies W/ EPA ORD
Location: R4-15T47-Water-Branch-Conf-Rm-15F-ATL
Start: Tue 7/25/2017 4:00 PM
End: Tue 7/25/2017 5:00 PM
Show Time As: Tentative
Recurrence: (none)
Meeting Status: Not yet responded
Organizer: Allenbach, Becky
Required Attendees: Speth, Thomas; Gilliland, Alice; Hall, Renea; Shell, Karrie-Jo; Davis, Molly; Campbell -
Dunbar, Shawneille; Elliott, Richard; Culpepper, Linda; Godreau, Jessica; Scott, Michael;
Grzyb, Julie; Zimmerman, Jay, rogers, rick; Dean, Glenda; Poolos, Ed; Harrison, Dennis;
Poy, Thomas
Optional Attendees: Sadosky, Rebecca; Cavalier, Julia
866-299-3188 code 4045629687
DEQ-CFW 00072932

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DEQ-CFW 00072935

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DEQ-CFW 00072936

If
Sadosky, Rebecca
From:
Culpepper, Linda
Sent:
Tuesday, July 18, 2017 3:50 PM
To:
Godreau, Jessica
Cc:
Risgaard, Jon; Midgette, Robert, Frick, Jay; Sadosky, Rebecca
Subject:
Re: Gen X treatment
Thank you. I need a staff review as well - check with EPA, Water Assoc. , etc. to ensure we have captured the current
status of potential technologies.
Sent from my iPhone
On Jul 18, 2017, at 3:37 PM, Godreau, Jessica <[e-mail]> wrote:
Linda,
Jon said you wanted some info on treatment for GenX. Here are some materials he forwarded. I've not
had time to review, but you can see his comments that summarize.
oq",G&a
Jessica C Godreau
Chief, Public Water Supply Section
Division of Water Resources
Department of Environmental Quality
919 707 9078 office
919 707 9100 main number
Jessica. GodreauO)ncden r. oov
1634 Mail Service Center
Raleigh NC 27699-1634
512 N Salisbury St, Raleigh, NC 27604
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Detlef Knappe [mailto:[e-mail]]
Sent: Monday, July 17, 201711:41 PM
To: Godreau, Jessica <[e-mail]>
Subject: Re: Gen X treatment
Hi Jessica,
The only available GenX treatment study is the one we published in ES&T Letters (attached). If
shows that GenX is less adsorbable on activated carbon than PFOA, but it is adsorbable. We
have additional data showing that GenX is about as adsorbable as C6 (perfluorohexanoic acid).
What is important to note is that shorter -chain ethers, that occurrec in Wilmington at
concentrations much higher than GenX were essentially non -adsorbable on activated carbon.
Currently, we do not have GAC breakthrough curves for GenX
DEQ-CFW 00072937

Anion exchange resins can remove GenX - we have date that has not yet been published.
RO can effectively treat C4 (perfluorobutanoic acid), which is smaller than GenX. Therefore, RO
should be able to take out most GenX (and most likely the other ethers). The attached paper may
be useful.
Let me know if you have questions.
Best,
Detlef
On 7/17/17 2:20 PM, Godreau, Jessica wrote:
Detlef,
I'm being asked to speak to effective treatments for Gen X.
Can you point me to any studies or analysis of a treatment system that conclude a
treatment effectiveness for Gen X? I've heard you mention RO; is there anything in
writing that at least compared the size of the particle to the pore size that I could
reference? I thought that was what Cape Fear was studying in part. I saw an article
suggesting a report out this week. Are you the researcher?
Any assistance is greatly appreciated.
09a"ka
Jessica C Godreau
Chief, Public Water Supply Section
Division of Water Resources
Department of Environmental Quality
919 707 9078 office
919 707 9100 main number
Jessica.Godreau(cD-ncdenr.gov
1634 Mail Service Center
Raleigh NC 27699-1634
512 N Salisbury St, Raleigh, NC 27604
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
Detlef Knappe
Professor
319-E Mann Hall
Department of Civil,
North Carolina State
Campus Box 7908
Construction, and Environmental Engineering
University
DEQ-CFW 00072938

. I.
Raleigh, NC 27695-7908
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web page: http://knappelab.wordpress.ncsu.edu/
<PFC FuIIScale VM013.pdf>
<PFECAs_Sun ESTL2016.pdf>
<PFECAs Sun ESTL2016 SI.pdf>
DEQ-CFW 00072939