DEQ-CFW_00075102

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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
Dear Ms. Pafford:
DuPont Fluoroproducts
22828 NC Highway 87 W
Fayetteville, NC 2M-7332
June 6, 2003
This letter is a notification of a newly discovered released chemical found during monitoring
of a groundwater area currently under a RCRA Facility Investigation (RFl) corrective action.
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 µg/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 µg/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 µg/L and 0.0628 µg/L
respectively. As in the January sampling round, all other groundwater sample locations did not
show ammonium perfluorooctanoate above the analytical method's practical quantification 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 µg/L.
E. I du Pont de Namours and Company ® Printed on Recycled Paper
FL-4 Rev.6,%
DEQ-CFW 00075102

Ms. Jill Pafford
NCDENR — DWM
June 6, 2003
Page 2 of 2
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
constitute a hazardous waste, nor is it listed as a hazardous constituent in 40 CFR Part 261
Appendix VIR.
Therefore, DuPont is proactively and voluntarily providing the Division with this analytical
data for informational purposes.
If you have any questions, please contact me at [phone].
Michael E. Johnson
Environmental Manager
cc: Mr. Larry Stanley, NCDENR Division of Waste Management, Central Office
DEQ-CFW 00075103