DEQ-CFW_00036388

YN O, m� 4.
DuPont Fluoroproducts
22828 NC Highway 87 W
Fayetteville, NC 28306-7332
11 =111711 � M101
June 28, 2006
Mr. Alan W. Klimek, P.E.
Director
NCDENR. — Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Dear Mr. Klimek:
On April 3, 2006, the DuPont Company — Fayetteville Works reported to the Division of
Water Quality the results of sampling in the Cape Fear River basin for the compound ammonium
perfluorooctanoate (APFO or C8). DuPont subsequently learned that an unvalidated analytical
method was used to generate those results. The retained river water samples were then analyzed
with the correct validated method, and those results are given on the attached table.
You will see that the attached results are similar to what was reported to you in April.
If you have any questions regarding this information, or if you need more details, please feel
free to call me at [phone],
Environmental Manager
Attachment
cc: Ms. Belinda Henson — NCDENR Division of Water Quality — Fayetteville
Ms. Jessica Miles NCDENR Division of Environmental Health Raleigh
Ms. Debra Benoy NCDENR Division of Environmental Health Wihnington.
Mr. Larry Stanley NCDENR Division of Waste Management — Raleigh
Ms. Mary Dominiak --- EPA — Washington DC (via dominiak.mar.y@epat?zailepa.gov)
El. du Pont de Nemours and Company
DEQ-CFW-00036388

Revised Analytical Results I
Sample
Sample
Sample Location
MCFRBA
NCDENR
APFO
Date
ID No.
Description
Location
DWQ Storet
OWL)
ID No.
Number
Cape Fear River at NC
02/15/06
CFR-5-E1
Highway 217 (Bridge in
M 5
B6840000
0.127
Erwin, NC)
02/16/06
CFR-10-El
Cape Fear River at the
M 10
B7500000
0.104
1-95 bridge
02/16/06
CFR-14-E1
Cape Fear River at
M 14
B8290000
0.095
DuPont river water intake
Cape Fear River upstream
02/14/06
CFR-16-El
of Smithfield Packing
M 16
B8302000
0.105
(North of Tarheel, NC)
02/16/06
CFR-13-E 1 N,t,
Rockfish Creek at
M 13
B8230000
0.007
NC Highway 87
02/16/06
CFR- 13 -EI -2 �O'e
Rockfish Creek at
M 13
B8230000
<0,006
NC Highway 87
Note: A field duplicate sample was taken at the Rockfish Creek location
MCFRBA = Middle Cape Fear River Basin Association
Vtg/L = micrograms per liter (parts per billion)
Limit of Quantification (LOCO for the procedure was 0.006 jig/L
DEQ-CFW-00036389