DEQ-CFW_00022620

July 1.3, 2017
MEMORANDUM
A
SUBJECT: Laboratory Resalts for GcnX (Rounds I-,-'I)NC DEQ Cape, Fear Watershed
Sampling
Timothy J. Buckley. L
FROM. )iredV
Exposure Methods and Mpa urefuents Division
THR
-Zavaleta. Direcfor U. Jennifer Ornie
TO: Linda Culpepper, Deputy Director
Division of Water Resources
North. Carolina Departnient of Environmental Quality
Per your request of June 9, 2017, 1 an-.i pleased to provide you with the W-boratory analysis
results I'm the concentration of Gen X in water samph,s collected by NC DEQ-These results are
for the first three weeks of sampling. Samples were received by our laboratory on Line 23rd,
June 30th- mid. July 7thfor each of these three rounds of weekly sampling, It is Our
understanding thatwe will be receivin g and analyzing samples from additional rounds of
san rom these additional sampling rounds will be reported separately as they
s nplhig ,. Results -f
become available, We will also report semi -quantitative concentrations of additional. PFAS
analytes irk..a later report.
Eich round of sampling consisted of a number of sites selected by NC DFQ that included
a .variety of water types: effluent, source, drinking, and well waters. Sampling rounds 2 and 3
also inladed tieldiblanks and spikes thaoAere provided by our laboratory for qUality control
purposes. It is our understanding that duplicate samples were collected at each site. One ofthe
duplicates -was provided to our laboratory, with the second sample being provided to a contract
laboratory, Test An-wrica (Dewv-er, Colorado), for Gen.Xanalysis. In rounds 2 and 3,1'est
America was also provided with field blanks and spikes that were by prepared our laboratory
p I I I
(round 2) w-id by an i ndependent lab within EPA (round 3). Results from these QC samples wil I
provide the basis for comparing our results with Test America. Our laboratory methods for this
analysis are described in. Sun. et tal, 2016' and Strynar et al., 20152.
Sun A71; Avcvab E, Stnnar M, hmi?aom A; Richav&on M- Klurns M Piuk-el,,A; SmAh C; Kvappc DRU� Legacy and Erna-
gmg
Importailt Drinkinz' Wab-,r Confammants in tht. ('4)eF'cu River Water,,died ofNiorth Carofrym. Enyironnicnwd
S&nce &Techndogy Letters- 2016
'Stqna M, Dagnfil""l "i, MCME�Ien R"Liang, S. l'rmhqrom A, Andeva= E, Mc? ifflan Lj hurnim N1, Ferret I. Ball C, IdenfifiQation ,A'Novc�
Perflumalkyl Etha CaCooxylic Acids ( PFECAs) and SuMmic Acie.5 (PFESA,,) in Natural Wafm Using Auurare fighf Mass
F"nViTon Sci Tedinol. 20 P 5
DEQ-CFW-00022620

The lbIlo inn provides a brief summary y of results.
• GenX, was obseived above our detection limit of ltl rrg/L in all but one sample.
• GenX concentrations ranged from 4 ngf'L (D WR 3 PO Hoffer WFP Raw, Water) to
21,759 ng/L (DW 1-t"heiaiorrrs O tfal'l).
• Some samples exceeded our calibration curve (particularly week I where this was the
case for ail but one sample). These samples were diluted and the analysis was repeated.
'The dil tirra procedure introduces some additional uncertainty in our quantification. We
have raked results for samples that recltr red dilution,
• Quality controlsamples (inchided in retrains 2 & 3 only) indicated no field or laboratory
contamination arid results accurate with about 5% of the expected values. Specifically,
QC samples showed:
* GenX was not detected in either of the two field blanks (rmtnd 2 & )
* Spiked field samples. (rr ; round 2 & 3) were ineasured with ar- accuracy that
ranged from 96.7 to 106 percent,
Hence. we have high confidence in the concentration ation results. reported her,-,,.
'rhank you for inviting us to be a part of this effort that addresses a very important public
health concerr. is North Carolina. These results represent the effort of ma �,�,ithin our lab but l
would especially like: to acknowledge Dr. Mark Strynar and his laboratory ,conducting the
tp
analysis, his Branch Chiel` l r. Myriwn Medina -'sera who provided in,,,alrable support and
coordination,, a:.n l Ms. Sania Tong Axga€r who supported and oversaw quality assurance.
If you 1-mve. any questions or concerns, do not hesitate to contact rrrale at (919) 41-24 4 or
email zt?. �' ' r'x�u��r4 . I loop fionvar•d_to our c ntinued 'ork together.
Attachment
CC. Becky B. Allenbach, Acting Deputy Directs
Water Prt.Aection Division, EPA Region 4 — Atlanta
DEQ-CFW 00022621

Jul 1 , 2017
Week
1.
2.
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
5
3
3
Concentration of GenX Measured in Cape Fear Watershed Samples
Conc.
Flag
Location Sample Identifier
(n L
DWR #1- Chemours Outfall
21,760
1
DWR #2 - Bladen Fluffs Raw water intake
501.
2.
NC DEQ #1_ LCFWSA
629
2
NC DEQ #2 - CFPUA Sweeny
226
2
C DEQ # - CFPDA_ASR well
588
2
NC DEQ #5 - International Paper Raw
703
2
NC DEQ #6 -- International Paper Finished
523
2
C DEQ #7 - NW Brunswick WTP finished
695
2
C DEQ #8 - Pender County 421 WTP Finished
269
2
C DEQ #4 - Wrightville Beach Well 11
27
DWR #1 Chernours Outfall' 002
15,250
1
DWR #2 Bladen Bluffs Raw water
31
NCDEQ 1 LCFWSA Raw water
72
NCDEQ 2 Sweeny Finished
1.0
NCDEQ 3 A R well
336
3
NCDEQ 4 Wrightsville Reach Well #1 .
2
NCDEQ , 5 International al Paper Raw water
41
CDE:Q 6 International Paper Finished water
111
NCDEQ 2 NW Brunswick WTP Finished
52
NCDEQ 8 Fender WTP Finshed
112
DWR 1 Ch�ernours Outfall 002
py
21,530
1
DWR 2 Bladen Bluffs Paw water
166
DWR 3 PO Hoffer WTP Raw Water
4
4
NCDEQ 1 LCFWSA Raw
11.9
NCDEQ 2 Sweeny Finished
87
NCDEQ 3 ASR Well
148.
NCDEQ 4 Wrightsville Beach Well #11
24
NCDEQ 5 International Paper Raw
15
NCDEQ 5 International Paper Raw DUPLICATE
162
NCDEQ.6 International Paper Finished
80
NCDEQ Q 7 NW Brunswick k WTP Finished
125
NCDEQ 8 Pender CO 421 WTP Finished
6
Sample diluted 20 ; diluted sample still exceeded calibration
Sample diluted 5
Sample diluted 2
Below limit of quantitatiran
DEQ-CFW 00022622