DEQ-CFW_00025148

SUBJECT. Laboratory.PFAS Results tear .N(-.'DFQ Cape 11'ear Watershed Sampling:
Week 6 & 7 Gie.nX Analvsls
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Ply ROM: k,Tim0t.hy,JA3uckley, Director
Fxpos,ure Metht.)ds and
AIL
THRIJ, P-Jenniter Orme- Zaval eta., Director
� National Exposure Research Laboratory
TOLinda Culpepper, Deputy Director
Divisiovi ofwater ResoUrcel.-I
North. Carolina Department of'Envlronrnentad Quality
E"Inclosed pleas c find our third report of ICI concentrationsin Cape Fear River water
sannples collected Linder the direction ofNC DEQ, This report includcs.NSUlts for Genx from
week� 6 & 7 sanipling,
We look. J"omard to meeting with you In person at oar laboratory in.Research'frianule
Park to go over t.he,,.,e,MSLdtS alld answer any. qucsticns that youinig.ht have. When we ri-leet III
penson, we are also planning to provide you with preliminary findings from our.r on -targeted.
analysis vvhic.h. require alit more explanation,
'I'llank you liar inviting us to be a pail ofthis ef.l.ort that addrcsws a very in.-iportant public
health concern in Ncm-th arol ina, Tliese results represent the e f7fort of man%� IN Ithill OUr lab but I
would especially like tc.,acknowledgeDrs. Mark. Strynar, Andy McCord. and
Seth Newton in conducting the laboratoryanalys'es, Dr. Wriam Med'na-Vera vdi.o provided
invaluable suppc�rt. and. coordination, and NAs. SamiaTorig-Argao �,vho supported and ovensxw
quality assurance,
It'vou liave any questions or concerns- do not lies'
itate to contactme at (9.19) 541-2454 or
email uv,- I look for-�vard to our co.nfinued work tog t. , ....... . ......... � C her,
Enclosure
CC: 13ecky B. Allenbach, USHIA Region 4
Jerj'Morris, I. -SETA OPPT
Betsy Bch], 1-ISF., PA, OW
Peter Grevatt, USFTA. 0W
Kathleen. Rafifiaele. USE-11A., (A -EN.
DEQ-CFW-00025148

Executive Summary
The week 6 & 7 GenX results were received by our lab on July 28, 2017 for week 6, and August
1, and 4, 2017 for week 7, respectively. Results show that GenX concentrations throughout the
river basin continue their decline starting with the Chemours outfall. (week 7 maximum of 67.9
ng/L) and extending downstream to finished drinking water (maximum at Pender Co. finished
water week 7 of 43-4 ng/L). Our QA/QC samples for these results are within expected tolerances
(i.e. undetected in blanks and spiked samples within 20% of expected concentrations) with one
exception: a high-level spike (200 ng/L) measured at 149 ng/L in week. 6 which was outside our
±20 percent range. The GenX results are provided in Attachment A.
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DEQ-CFW-00025149

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DEQ-CFW 00025150