DEQ-CFW_00082028

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DuPont FlUaroproducts
22828 NC Highway V W
Fayetteville, NC 28306-7332
DuPont Fluoroproducts
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"alardous Waste N-
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Ms. Jill B. Pafford, Chief
NCDENR — Division of Waste Management
Hazardous Waste Section
1646 Mail Service Center
Raleigh, NC 27699-1646
Attn.- Mr. Karim Pathan
Subject: Notification of Newly Discovered Released Chemical
DuPont Company -- Fayetteville Works SMWU 6-03
Permit No. NCI? 047 368 642
On January 27, 2003, groundwater samples were taken at several locations surrounding a
new manufacturing facility for the purpose of establishing the groundwater baseline level of
pentadecafluorooctanoic acid ammonium salt (CAS No. 3825-26-1), also known as ammonium
perfluorooctanoate. The groundwater from the monitoring well identified as SWMU 6-03 in this
site's Confirmatory Sampling Report had an analytical result of 0.0649 �tg[L of ammonium
perfluorooctanoate. All other groundwater sample locations did not show ammonium
perfluorooctanoate above the analytical method's practical quantification level of 0.050 �tg/L
This unexpected analytical result prompted DuPont to perform a confirmatory second round
sampling of groundwater that was conducted on March 27, 2003. On that date, two separate
samples were taken from the SWMU 6-03 monitoring well. The analytical results from that
sampling showed levels of ammonium perfluorooctanoate at 0.0684 IAg/L and 0.0628 �Lg/L
respectively. As in the January sampling round, all other groundwater sample locations did not
show ammonium -oerfluorooctanoate above the analvtical method's oract'cal nuantification level.
Therefore, DuPont is notifying the Division of Waste Management that a groundwater
analysis of SWMU 6-03 indicates the presence of ammonium perfluorooctanoate at a level of
0.068
E. I du Pont de Nemours and Company Printed on Recycled Paper
FL-4 Rev. 6199
DEQ-CFW-00082028

IL
Part V(D)(1) of the subject permit requires that DuPont notify the Department in writing of
any newly discovered release of a hazardous waste or hazardous constituent discovered during
the course of groundwater monitoring. However, ammonium perfluorooctanoate would not
I I
constitute a hazardous waste, nor is it listed as a hazardous constituent in 40 CFR Part 261
Appendix VIII.
Therefore, DuPont is proactively and voluntarily providing the Division with this analytical
data for informational purposes.
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678-1155.
0
Michael E. Johnson
Environmental Manager
DEQ-CFW-00082029