DEQp00020439

Mr. Gil Vinzani
NCDENR — Division of Water Quality
DuPont Fluoroproducts
22828 NC Highway 87 W
Fayetteville, NC 28306-7332
December 5, 2007
NPDES Unit
1617 Mail Service Center ��� _�r L
Raleigh, North Carolina 27699-161fill
7
DEC -- 6 20'07 �i
SUBJECT: Changes of Discharge of Toxic Substances
NPDES Permit No. NC0003573 ?EtdR �`?A1' `UAI''
Dear Mr. Vinzani:
This letter is the written notification, as required by Part III(C)(b) of the subject NPDES
permit, of the discharge of a pollutant from the DuPont Company — Fayetteville Works, which is
not limited in the permit.
DuPont has determined that fluoromalonate is being discharged from the site's wastewater
treatment plant at a concentration exceeding the notification level of 0.50 mg/L specified in
Part III(C)(b)(1) the NPDES permit. Recent analysis of the treatment plant's clarifier effluent
showed the fluoromalonate concentration as high as 0.97 mg/L.
The compound being discharged from the treatment plant would likely be monopotassium
fluoromalonate (CAS No. 3107-37-9) or dipotassium fluoromalonate (CAS No. 3107-37-7).
Depending on the pH, the compound in the Cape Fear River would be either fluoromalonic acid
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Should you require additional information, or if you have any questions, please contact me at
[phone].
Environmental Manager
cc: Belinda Henson, NCDENR DWQ, FRO
E.I. du Pont de Nemours and Company