DEQ-CFW_00062573

DuPont Fluoroproducts
P.O. Drawer
Fayetteville, NC 28302-1770
4WO
DuPont Fluoroproducts
August 27, 1998
Mr. David Goodrich
NC DENR
Division of Water Quality
Permits & Engineering Unit
P. O. Box 29535
Raleigh, NC 27626-0535
RE: NPDES Permit No. NC0003573
Dear Mr. Goodrich:
Pursuant to Part III(C)(a) of the referenced NPDES permit, DuPont — Fayetteville Works is
required to notify the Division of Water Quality of a planned activity which would result in the
routine discharge of a toxic pollutant, not limited in the permit, which would exceed 100 µg/L
concentration in the treated effluent.
This site is planning to install a water scrubber to comply with the requirements of the
Printing and Publishing NESHAP as codified in 40 CFR 63 Subpart KK. The scrubber will
remove dimethyl formamide (DMF) from the exhaust vent of the Butacite® Tinting Process, and
the effluent from the scrubber will be biologically treated in the site's Wastewater Treatment
Plant (WWTP). The treated wastewater will be discharged through Outfall 001, which does not
have a permit limitation for DMF.
The maximum potential DMF scrubbed out of the exhaust vent would be 218 lb/day. We
anticipate that most of the DMF would be biologically degraded. However, if all 218 lb/day of
the incoming DMF were discharged from the WWTP, the maximum DMF concentration at
Outfall 001 would be approximately 29 mg/L.
Dimethyl formamide is not one of the priority pollutants listed as part of the Clean Water
Act, therefore I do not believe that a specific numerical limitation needs to be established.
I trust that this letter satisfies the notification requires specified in the referenced NPDES
permit. If you have any questions, please feel free to call me at [phone].
RECEN —
erp 0 1 1998
FAYETTEVILLE
.EG. C 7F CE
Michael E. Johnson
Environmental Coordinator
cc: Ms Kitty Kramer, NCDENR Division of Water Quality, Fayetteville
E. L du Pont de Nemours and Company
® Printed on Recycled Paper
FL-4
DEQ-CFW 00062573