Permit Mod 2008

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Michael F. Easley
Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
February 26, 2008
Mr. Michael E. Johnson
Environmental Manager
E.I. DuPont de Nemours &Company
22828 NC Hwy 87 W
Fayetteville, North Carolina 28306-7332
Dear Mr. Johnson:
Coleen H. Sullins, Director
Division of Water Quality
Subject: NPDES Permit Modification
Permit No. NC0003573
Fayetteville Works
Bladen County
The Division has reviewed and approved your request to modify your permit to include the
addition of a third clarifier and to relocate outfall 002 above Lock &Dam 3 on the Cape Fear
River. The Supplement to Permit Cover Sheet and the map have been modified. Please replace
the enclosed pages in your permit.
If you have any questions please call Teresa Rodriguez at [phone], extension 553.
Sinc��erel�y,
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Cc: NPDES Files
Fayetteville Regional Office -Surface Water Protection
Construction Grants and Loans
EPA Region 4
Central Files •
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone]
Internet: h2o.enr.state.nc.us 512 N. Salisbury St. Raleigh, NC 27604 FAX [phone]
An Equal Opportunity/AfFlrmaiive Action Employer — 50% Recycled/10%Post Consumer Paper
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Customer Service
1-877-623-6748

Per nit NC0003573
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked, and as of this issuance, any previously issued permit bearing this number is no longer
effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the
permit conditions, requirements, terms, and provisions included herein.
E.I. DuPont de Nemours & Co., Inc.
is hereby authorized to:
1. Continue to operate existing wastewater treatment facilities consisting of:
• equalization;
• neutralization;
• aerated pre -digester tank;
• nutrient feed system;
• aeration tank;
• dual clarifiers;
• effluent flow measurement,
• tertiary filters
• DAF unit;
• rotary filter for sludge thickening;
• sludge filter press; and
• steam heated sludge dryers.
2. After obtaining an Authorization to Construct (ATC) from the Division, construct and
operate a third clarifier.
3. Discharge treated process wastewater from Butacite, Nafion, Teflon® PMDF, and PVF,
process stormwater, sanitary wastewater, and co -neutralized regenerate from said
treated facilities through internal outfall 001;
4. Discharge stormwater, non -contact cooling water, boiler blowdown and condensate, and
treated wastewater effluent from 001, through outfall 002 at the location specified on
the attached map into the Cape Fear River, a class C water in the Cape Fear River
Basin,
5. After obtaining an Authorization to Construct (ATC) from the Division, relocate outfall
002 to the Cape Fear River at the location specified on the attached map.

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DuPont Fluoroproducts
22828 NC Highway 87 W
Fayetteville, NC 28306-7332
February 13, 2008
Ms. Teresa Rodriguez
NCDENR Division of Water Quality
512 N. Salisbury Street
Archdale Building —Room 925
Raleigh, North Carolina 27604
SUBJECT: NPDES Permit Minor Modification Request
DuPont Company —Fayetteville Works
NPDES Permit No. NC0003573
Dear Ms. Rodriguez:
The DuPont Company —Fayetteville Works requests a minor modification of the subject
NPDES Permit so that we may proceed with two Authorization to Construct applications for the
N.C. Division of Water Quality's Construction Grants and Loans Section. The two requested
modifications are described below.
ADDITION OF THIRD CLARIFIER
The first requested modification is to change the Supplement To Permit Cover Sheet to
allow for the operation of a third clarifier. This new clarifier will be sized so that it can manage
the entire flow from the site's Wastewater Treatment Plant (WWTP). However, DuPont requests
that the new language allow for continued operation of one or both of the existing clarifiers,
either independent of or with the third clarifier.
DuPont requests that the permit's Supplement To Permit Cover Sheet modification be
worded so that the site would continue to operate the two existing clarifiers until such time that
the third clarifier is constructed and operational, at which time the site would operate some or all
of the'three clarifiers.
It is expected that the operation of the third clarifier will improve the solids removal from
the treated WWTP effluent. As such, DuPont is not requesting any change to the current NPDES
permit limits for Total Suspended Solids at Outfa11001.
E.I. du Pont de Nemours and Company
c.
February 13, 2008
Ms. Teresa Rodriguez
NCDENR Division of Water Quality
512 N. Salisbury Street
Archdale Building —Room 925
Raleigh, North Carolina 27604
SUBJECT: NPDES Permit Minor Modification Request
DuPont Company —Fayetteville Works
NPDES Permit No. NC0003573
Dear Ms. Rodriguez:
The DuPont Company —Fayetteville Works requests a minor modification of the subject
NPDES Permit so that we may proceed with two Authorization to Construct applications for the
N.C. Division of Water Quality's Construction Grants and Loans Section. The two requested
modifications are described below.
ADDITION OF THIRD CLARIFIER
The first requested modification is to change the Supplement To Permit Cover Sheet to
allow for the operation of a third clarifier. This new clarifier will be sized so that it can manage
the entire flow from the site's Wastewater Treatment Plant (WWTP). However, DuPont requests
that the new language allow for continued operation of one or both of the existing clarifiers,
either independent of or with the third clarifier.
DuPont requests that the permit's Supplement To Permit Cover Sheet modification be
worded so that the site would continue to operate the two existing clarifiers until such time that
the third clarifier is constructed and operational, at which time the site would operate some or all
of the'three clarifiers.
It is expected that the operation of the third clarifier will improve the solids removal from
the treated WWTP effluent. As such, DuPont is not requesting any change to the current NPDES
permit limits for Total Suspended Solids at Outfa11001.
E.I. du Pont de Nemours and Company

Ms. Teresa Rodriguez
N.C. Division of Water Quality
February 13, 2008
Page 2 of 2
RELOCATION OF EFFLUENT DISCHARGE INTO THE CAPE FEAR RIVER
The second requested modification is to change the map that follows the Supplement To
Permit Cover Sheet to allow for the relocation of site's final effluent discharge into the Cape Fear
River to a point upstream of Lock & Dam 3. The reason for this relocation is to stop the erosion
that is occurring in the current effluent channel and the ensuing discharge of soil sediment into
the river.
The December 7, 2007 letter from Mr. Gil Vinzani, N.C. Division of Water Quality, to
DuPont stated that the Division reviewed the QUALM modeling report and concurs that the
above relocation will not affect the dissolved oxygen levels in the Cape Fear River, and that
DuPont could proceed with a permit modification request to relocate the discharge.
For your convenience, attached is a photocopy of the NPDES Permit's map with an
indication of the approximate location of the proposed discharge point into the river.
DuPont requests that the permit's modification be worded so that the site would continue to
discharge at the existing location in the river until such time that the new effluent conveyance
system is constructed and operational, at which time the site effluent would discharge to that
location.
The relocation of the effluent discharge will not change the quality of the effluent, and as
such, DuPont is not requesting any change to the current NPDES permit limits for Outfall 001 or
Outfall 002,
Should you have any questions regarding this requested permit modification, please feel free
to call me at [phone].
Attachment
Environmental Manager