NC0065099_Permit (Issuance)_19960617

NPDES DOCUMENT SCANNING COVER :SHEET
NC0065099
CPI Southport
NPDES Permit:
Document Type:
'Permit Issuanceee
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Technical Correction
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
June 17, 1996
This; document is printed on reuse paper - igrzore any
content on the reezerse'aide

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
AvvIlvA
�EHNR
June 17, 1996
Mr. Steven J. Doyon, P.E.
Cogentrix Energy, Inc.
9405 Arrowpoint Boulevard
Charlotte, North Carolina 28273-8110
Subject: NPDES Permit Issuance
Permit No. N0065099
Southport Facility
Brunswick County
Dear Mr. Doyon:
In accordance with the application for discharge permit received on December 12,
1995, the Division is forwarding herewith the subject state - NPDES permit. This permit is
issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the
Memorandum of Agreement between North Carolina and the U.S. Environmental
Protection Agency dated December 6, 1983.
If any parts, measurement frequencies or sampling requirements contained in this
permit are unacceptable to you, you have the right to an adjudicatory hearing upon written
request within thirty (30) days following redeipt of this letter. This request must be in the
form of a written petition, conforming to Chapter 150B of the North Carolina General
Statutes, and filed with the office of Administrative Hearings, Post Office Drawer 27447,
Raleigh, North Carolina 27611-7447. Unless such a demand is made, this permit shall be
final and binding.
Please take notice that this permit is not transferable. Part II, E.4. addresses the
requirements to be followed in case of change in ownership or control of this discharge.
In accordance with your request to store tire -derived fuel (TDF) on the coal pile, the
Division offers its consent with this permit. Please understand, however, that this permit
does not affect the legal requirements to obtain other permits which may be required by the
Division of Environmental Management or permits required by the Division of Land
Resources, Coastal Area Management Act, or any other Federal or Local governmental
permits may be required.
P.O. Box 29535, Raleigh, North Carolina 276.?6-0535 Telephone [phone] FAX [phone]
An 7.qual Opportunity Affirmative Action Employer 50% recyc';d/ 10% poet -consumer paper

If you have any questions or need additional information, please contact Mr. Mark
McIntire, telephone number [phone], extension 553.
Sincerely,
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E.
cc: Central Files
Mr. Roosevelt Childress, EPA
Wilmington Regional Office, Water Quality
Permits and Engineering Unit
Facility Assessment Unit

Permit No. NC0065099
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1,
other lawful standards and regulations promulgated and adopted by the North Carolina
Environmental Management Commission, and the Federal Water Pollution Control Act, as
amended,
Cogentrix of North Carolina, Inc.
is hereby authorized to discharge wastewater from a facility located at
Southport Facility
on NCSR 1527
north of Southport
Brunswick County
to receiving waters designated as the Atlantic Ocean via the CP&L - Brunswick Plant Effluent
Channel in the Cape Fear River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, II, III and IV hereof.
This permit shall become effective August 1, 1996
This permit and authorization to discharge shall expire at midnight on July 31, 2001
Signed this day June 17, 1996
Original Signed By
David A Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Environmental Management
By Authority of the Environmental Management Commission

•
Permit No. NC0065099
SUPPLEMENT TO PERMIT COVER SHEET
Cogentrix Of North Carolina, Inc.
is hereby authorized to:
1. Continue to operate a coal pile runoff system, a sump water discharge system, a
boiler blowdown discharge system (outfall 001), a cooling water blowdown system
(outfall 002), and outfall 003, which is the combined wastestreams from outfall 001
and 002 at the Southport Facility on NCSR 1527, north of Southport, Brunswick
County (See Part III of this Permit), and
2. Discharge from said treatment works at the location specified on the attached map
into the Atlantic Ocean via the CP&L - Brunswick Plant Effluent Channel which is
classified Class SB waters in the Cape Fear River Basin.

r
•
Ii-
etch of the v -, 7 ,i 'Z.-J.�� --f ib— ..!
To+ -.s ,�
ROAD CLASSIFICATION
SECONDARY HIGHWAY
HARD SJRrACE ■
Latit • e 33`57'09"
Map # L29S-
Stream Class S
UNIMPROVED
►oa -itU
-basin 03
Discharge Class 100% In•ustrial
Receiving Stream "P&L-Bswick Channel
Design Q NOL
Permit expires-7/ 31 r 01
• ll
I Towe•s
SCALE 1:24 000
CONTOUR INTERVAL 5 FEET
•
sta
30
1 MILE
7000 FEET
Cogentrix of NC, Inc.
NC0065099
Brunswick County
Power Plant
RI\ r)av . -3a17_3

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
G�c (Li.1 c ,` u&o_- U6
Permit No. 0065099
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to dischargfrom outfall
serial numbei[DD�Such discharges shall be limited and monitored by the permittee as specified below:
Effluent CjharacteristiQs
Flow
Total Suspended Residue
Oil and Grease
Lbs/day
Discharge Limitations
Units (specify),
Mon. Avg. Daily Max Mon. Avg_ Daily Max,
30.0 mg/I
15.0 mg/I
50.0 mg/I (\0 mg/I
Monitoring
Measurement
Frequency
Continuous
2/Month
2/Month
*Sample Locations: E - Effluent, I - Influent
Metal cleaning wastes are prohibited from being discharged from this facility.
The runoff of oils, hazardous substances, and toxic substances from the plant site must be prevented.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Requirements
Sample
Type
Recorder
Composite
Grab
'Sample
Location
I or E
E
E

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. NC0065099
During the period beginning on the effective date of the permit and lasting until expiration, the Pennittee is authorized to discharge from outfall
serial number 00) Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristics
Flow
Free Available Chlorine***
Chromium
,Zinc
Barium
Copper
LbsIda.y
Discharge Limitations
Units (specify)
Mon. Avg. Daily Max Mon. Avg, Daily Max.
0.2 mg/I 0.5 mg/I
�- 0-05-mg/I t/✓
i ,,. 1.0 mg/I
Monitoring Requirements
Measurement
Frequency
Weekly
Weekly
2/Month
2/Month
Monthly
Monthly
*Sample
Location
Instantaneous E
Grab E
Composite E
Composite E
Composite E
Composite E
Sample
Type
THERE SHALL BE NO CHROMIUM, ZINC, OR COPPER ADDED TO THE TREATMENT SYSTEM EXCEPT AS PRE -APPROVED
ADDITIVES TO BIOCIDAL COMPOUNDS (SEE PART III OF THIS PERMIT).
*Sample Locations: E - Effluent
*** Neither free available chlorine nor total residual chlorine may be discharged from any unit for more than two hours in any one day and not
more than one unit in any plant may discharge fret available or total residual chlorine at any one time.
The permittee shall obtain authorization from the Division of-Environrnental-Man.agemen prior to utilizing any biocide in the cooling water (See
Part III of this Permit).
There shall be no discharge of floating solids or visible foam in other than trace amount.
L-tom

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0065099
During the p beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall
serial numb r 003 , Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristics
Discharge Limitations Monitoring Requirements
Lbs/day Units y (SpeCif ). Measurement 5_0mplg "Sample
Mon. Avg. Daily Max Mon. Avg. Daily Max. Frequency Type Location
itc) PA tIvise\k\A--6—c
The pH shall not be less that 6.8 standard units nor greater than 8.5 standard units and shall be monitored weekly at the effluent by grab
sample.

D r b
Part III Permit No. NC0065099
- E. BIOCIDE CONDITION
The permittee shall obtain authorization from the Division of Environmental Management prior to
utilizing any biocide in the cooling water. The permittee shall notify the Director in writing not
later than ninety (90) days prior to instituting use of any additional biocide used in the treatment
system which may be toxic to aquatic life other than those previously reported to the Division of
Environmental Management. Such notification shall include completion of Biocide Worksheet
Form 101 and a map indicating the discharge point and receiving stream. Concentrations of
chromium, copper or zinc added to biocides shall not exceed applicable water quality standards or
action levels in the receiving stream, as determined by calculations from the biocide worksheet
Form 101 with Supplemental Metals Analysis worksheet.

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0065099
PERMITTEE NAME: Cogentrix of North Carolina, Inc.
FACILITY NAME: Southport Facility
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: 001
Design Capacity: 0.9921 MGD
Domestic (% of Flow):
Industrial (% of Flow): 100 %
Comments:
Effluent Guidelines Attached
3 a c?.� .11s C�osdr a - cc \J
RECEIVING STREAM: the CP&L - Brunswick Plant Discharge Canal
Class: SB
Sub -Basin: 03-06-17
Reference USGS Quad: L 26 NE (please attach)
County: Brunswick
Regional Office: Wilmington Regional Office
Previous Exp. Date: 06/30/96 Treatment Plant Class: 1 i
Classification changes within three miles:
Requested by:
Prepared by:
Reviewed by:
D
Jeanette Powel
AMERr.41.W.7
9aze6afru5
Date: 01/02/96
Date: 3 /W
Date: 4 (D
3 1
Modeler
Date Rec.
#
5Gb
k I Z \ iCo
g-4l0
Drainage Area (mi2 )
Avg. Streamflow (cfs):
7Q10 (cfs) Winter 7Q10 (cfs) 30Q2 (cfs)
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream Location
Downstream Location
(
Effluent
Characteristics
Summer
Winter
BOD5
'(m )
NH3-N (mg/
D.O. (mg/1)
TSS (mg/1)
F. Col. (/100 ml)
pH (SU)
Flow (MGD):
Oil and Grease (mg/L):
TSS (mg/L):
pH (S.U.)
Comments:
Outfall 001
Monthly Avg. Daily Max.
monitor
15.0
30.0
20.0
50.0
6.8-8.5

EFFLUENT GUIDELINE LIMITATIONS
REVISED 01/14/96
Cogentrix - Southport
NC0065099
Waste Flow Source
Daily Max. (MGD)
Mo. Avg. (MGD)
Outfall
Low Volume Waste
2.785
0.954
001
Coal Pile Runoff
0.09
001
Cooling Tower Blowdown
0.486
0.225
002
OUTFALL 001
V�Sr0�s h4.szck ��cv�r ?cocLe"ss ��0L�.
ELL «ry t�cg L - -1-�c l i d-
Effluent Parameter
EPA Limitations in 40 CFR
(mg/IL
Effluen
(Ibs/day)
Daily Max
Limits
30 day avg.
Comments
Daily Max
30 day avg.
pH (s.u.)
6.0-9.0
6.8-8.5
6.8-8.5
NC Saltwater WQ Standard
TSS (low vol. sources)
100.00
30.00
2322.69
238.69
BPT, 40 CFR 423.12(b)(3)
TSS (coal pile runoff)
50.00
0.00
37.53
0.00
BPT, 40 CFR 423.12(b)(9)
Cumulative
TSS (Ibs/day):
2360.22
238.69
Oil and Grease (low vol.)
20.00
15.00
464.54
119.35
BPT, 40 CFR 423.12(b)(3)
OUTFALL 002
Effluent Parameter
EPA Limitations in 40 CFR
(mg/1),
Effluen Limits
(mg/I)
Comments
Maximum
Average
Daily Max
30 day avg.
pH (s.u.)
6.8-8.5
6.8-8.5
NC Saltwater WQ Standard
Free Avail. Chlorine
0.50
0.20
0.50
0.20
BPT, 40 CFR 423.13(d)(1)
Total Chromium
0.20
0.20
0.20
0.20
BPT, 40 CFR 423.13(d)(1)
Total Zinc
1.00
1.00
1.00
1.00
BPT, 40 CFR 423.13(d)(1)
126 Priority Pollutant?
BPT, 40 CFR 423.13(d)(1)
Note: Mass limits are given at outfall 001 since waste streams subject to different limitations are combined in the low
volume waste treatment basin prior to discharge. Concentration limits are given at outfall 002 since the cooling
tower blowdown is not co -mingled or diluted prior to discharge.
• The facility shall be subject to monitoring and reporting any of the 126 Appendix A priority pollutants which
may be contained in chemicals added for cooling tower maintenance. Compliance with the limitations for the 126
priority pollutants may be determined by engineering calculations which demonstrate that the regulated pollutants
are not detectable in the final discharge by the analytical methods in 40 CFR part 136.

Rio
2000 GPD
Sanitary
2000 GPD
1,173;000 GPD
Oemineralizer
Municipal Water Supply
3,853,400 GPD
-110,600-GtD-
980,900 GPD 181,500 GPD_
Consumption Boilers I Blowdown
Coal Pile
Runoff
Miscellaneous
Plant Sumps
90,000 GPD.
(Max. )
20.00 GPD
1
1,908 400 GPD
Evaporation
678 . 267t
, 400 GPO ,
Coaling . owers ,
690,000 GPD
Blowdown .
Low, Volume ibste
- 302,100 GPO 002
•
r Treatment Basin 001
003
NPOES Discharge
992,100 GPD
Water Balance
110 NW Cogeneration plant
Southport, Borth Carolina
Diagram S-1
31101ddH0 XI61N3000 WdbI:fiO

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0065099
PERMITTEE NAME:
FACILITY NAME:
Cogentrix of North Carolina, Inc.
Southport Facility
Facility Status: Existing
Permit Status: Renewal
Major Minor -4
Pipe No.: 001
Design Capaci 1.9921 MGD
Domestic (% of Flow):
Industrial (% of Flow): 100 %
Comments:
Effluent Guidelines Attached
c „A cl11s (c( ckcdcc ck.k,{ cc,c0
RECEIVING STREAM: the CP&L - Brunswick Plant Discharge Canal
Class: SB
Sub -Basin: 03-06-17
Reference USGS Quad: L 26 NE (please attach)
County: Brunswick
Regional Office: Wilmington Regional Office
Previous Exp. Date: 06/30/96 Treatment Plant Class: I I
Classification changes within three miles:
Requested by:
Prepared by:
Jeanette Powe11'Z 1 Date: 01/02/96
A4411
Reviewed by: aid (1iiV'1�-'
Date: 3
Date.
Modeler
Date Rcc.
41
SLD
Drainage Arca (mil )
k\+c-
FS411
Avg. Streamflow (cfs):
7Q10 (cfs) Winter 7Q I 0 (cfs)
Toxicity Limits: !WC
Instream Monitoring:
Parameters
30Q2 (cfs)
% Acute/Chronic
Upstream Location
Downstream Location
Effluent
Characteristics
Suninicr Winter
c
Flow (MGD):
Free Available Chlorine
(ug/L):
Chromium (ug/L):
Zinc (ug/L):
Barium (ug/L):
Copper (ug/L):
pH (S.U.)
126 Priority Pollutants
Outfall
Monthly Avg.
monitor
200
monitor
monitor
6.8-8.5
002 -
Daily Max.
_
500
50.0 r
1000
—
C.Olnlncnis:
AIL
3/

Cogentrix
NC0065099
EFFLUENT GUIDELINE LIMITATIONS
Waste Flow Source
MCT)
Oultall
Low Volume Waste
0.2121
001
Coal Pile Runoff
0.09
001
Cooling Tower Blowdown
0.69
002
OUTFALL 001
Effluent Parameter
EPA Limitations in 40 CFR
(mg/I)
Effluent Limits
(Ibs/ day)
Comments
Daily Max
30 day avg.
Dairy Max
30 day avg.
pH (s.u.)
6.0-9.0
6.0-9.0
6.8-8.5
6.8-8.5
NC Saltwater WQ Standard
TSS
100.00
30.00
176.89
53.07
BPT, 40 CFR 423.12(b)(3)
TSS
50.00
0.00
37.53
0.00
BPT, 40 CFR 423.12(b)(9)
Cumulative
TSS (tbs/day):
214.42
53.07
011 and Grease
20.00
15.00
35.38
26.53
BPT, 40 CFR 423.12(b)(3)
OUTFALL 002
Effluent Parameter
EPA Limitations in 40 CFR
(mg/I)
Effluent Limits
(mg/I)
Comments
Maximum
Average
Daily Max
30 day avg.
pH (s.u.)
6.8-8.5
6.8-8.5
NC Saltwater WO Standard
Free Avail. Chlorine
0.50
0.20
0.50
0.20
BPT, 40 CFR 423.13(d)(1)
Total Chromium
0.20
0.20
0.20
0.20
BPT, 40 CFR 423.13(d)(1)
Total Zinc
1.00
1.00
1.00
1.00
BPT, 40 CFR 423.13(d)(1)
126 Priority Pollutants'
BPT, 40 CFR 423.13(d)(1)
Note: Mass limits are given at outfall 001 since waste streams subject to different limitations are combined in the low
volume waste treatment basin prior to discharge. Concentration limits are given at outfall 002 since the cooling
tower blowdown is not co-mingted or diluted prior to discharge.
• The facility shall be subject to monitoring and reporting any of the 126 Appendix A priority pollutants which
may be contained in chemicals added for cooling tower maintenance. Compliance with the limitations for the 126
priority pollutants may be determined by engineering calculations which demonstrate that the regulated pollutants
are not detectable In the final discharge by the analytical methods In 40 CFR part 136.

�
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pnl qbLur Supply
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�
\
CIAno°Jx � �
�/w
�
'
�O
� ----'---- ---'---- cuo/inU
�vu:Dnrk1 ~
590`O0O GPD
8l0vo
~
Low Volume Waste
Treatmoilt B03in
/
]02l00 GPD
-
/
| o����C Co*°��w�x-c1 /
HPDE3 Di�c�ar�e
`-992,1100 GyU
NoLer Da7anco*
lI] HN Copnpratinn Plont
thpUrt, North Carolion
o\/oo

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0065099
PERMITTEE NAME:
FACILITY NAME:
Cogcntrix of North Carolina, Inc.
Southport Facility
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.. 003
Design Capacity: 0.9921 MGD
Domestic (% of Flow):
Industrial (% of Flow):
100 %
Comments:
Effluent Guidelines Attached
.1.t_ (-:,\OS (A' ckccia ca•cLic�)
RECEIVING STREAM:thc CP841. - Brunswick Plant Discharge Canal
Class: SB
Sub -Basin: 03-06-17
Reference USGS Quad: L 26 NE
County: Brunswick
Regional Office: Wilmington Regional Office
(please attach)
Previous Exp. Date: 06/30/96 Treatment Plant Class:
Classification changes within three miles:
Requested by: Jeanette Powell:
Prepared by:
Reviewed by: Cett-de"..c 0/Gt.t!',(1i747Yi
II
Date: 01/02/96
Date: J //y fk;
Date: 61J
Modeler
sc€�
Date Rec.
Drainage Area (mi2 )
`2k�i 10
Avg. Streamflow (cfs):
7Q10 (cfs) Winter 7Q10 (cfs)
30Q2 (cfs)
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream Location
Downstream
Location
Effluent
Characteristics
Summer
Winter
BOD )
NH3-N (mg/1)
D.O. (mg/1)
TSS (mg/1)
F. Col. (/l00 ml)
pH (SU)
pH (S.U.)
Comments:
Outfall 003
Monthly Avg. Daily Max.
6.8-8.5
'PcD, 1st_ GG�G4�ilf/�
9
3

c .
4
; •
•
2c.)00 GPD
i
1 '.-•!iiLe.r:,' I
%000 GP[)
1
: • : r
Muni:-.ipal Water Supply
GPD
1 •
j.Y),(i)
.1,,no
(N)(mo GPD
Lon sump Li OT-----L Boilers B owd 01'in
Coal Pile 1_9p,000_GPR,
Runoff i (Max.)
1;1 jo. ;;•., , . . , :
1
12ti
i P1
1 0T1 TT')
,Joo ing
r
tIVCV.);
Low Volume Waste
Treatment Basin
1(7 /IV/ b?
7 " •
,673,400 GPD
- ,...- 690,000 GPD
7-/-,;/v7.-;•-•:- ii.-..',,:n...' B I owdown
,-• ,-. • , . .
.. .._. /
‘ .• ,--, ,-:: ,!:;..) 7.1-.1. ,•<-1-: ,.).4•.', -$:',-,•,:. •(•:-.../.1
, „ , . .,
i /1 ...) .., i • I / .1 '':' ...' .....1
• 302,100 GPD . - (1°2,)
710-
NPFIES Di::chrtroc
.992,100 CP5
Water Balance11 MW Cogeneration Plant
Scithport, North Carolina
•
Frdly, 0 feims4A-s
1,1C('

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requester:
Date of Request:
Topo Quad:
REC'9 FEB 221996
FACT SHEET FOR WASTELOAD ALLOCATION
.4to
g4 t
Request # 412—
Cogentrix of North Carolina, Inc. - Southport Facility
NC0065099
100% Industrial
existing
renewal
the CP&L - Brunswick Plant Discharge Canal
SBephwell Beach. cut -,'
03-06-17
Brunswick
Wilmington
Jeanette Powell
1/15/96
L26NE
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
man-made dischg
canal. Flow info
is unavailable.
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Three outfalls are listed in this WLA. Outfall 001 discharges effluent from the
sedimentation ponds. Wastewater from these ponds consists of boiler blowdown, rainwater
runoff from coal piles, and miscellaneous plant sumps. Outfall 002 discharges wastewater from
the cooling towers. The 1992 staff report indicates that effluent from 002 contained concentrations
of Cr, Ba, Zn, Cu, and Pb that were above the detection level. As a result monitoring was
recommended for Ba, Cu, and Pb in the 1992 WLA. Limits for Cr and Zn were given based on
federal effluent guidelines. DMR monitoring data for 002 since 1992 indicate concentrations above
the detection level have been measured for all of the above mentioned metals. However, Pb
concentrations have only been above detection twice since 1992 (5.0 ug/L Jan. '93 and 3.0 ug/L in
Feb. '93). Since the only two above detection Pb measurements were still below the typically used
detection level of 10 ug/L for lead, it is recommended that Pb monitoring be removed from the
permit. Outfalls 001 and 002 are combined at the discharge point of the pond. Below the
combining point for 001 and 002 the facility has the ability to adjust the pH. As a result of the
additional ability to treat the effluent below the combining points of 001 and 002, the region in
1992 recommended the designation of an additional outfall labeled 003. The facility has been
compliant with their pH limit at 003. pH monitoring is still the only requirement recommended for
003. A review of the 126 Priority Pollutant analysis run in 1995 did not reveal any compounds
which require further monitoring.
Since accurate flow data is unavailable for the man-made discharge canal water quality limits were
not evaluated. Federal effluent guideline limits are recommended for this facility. In addition,
monitoring for Ba and Zn is also recommended. The facility has not requested mass limits.
The facility has been compliant with their permit since the last WLA in 1992.
A current staff report was not reviewed for this WLA.
Special Schedule Requirements and additional comments from Reviewers:
L

2
Recommended by: ia(t) Date: Vig/%6.2
Reviewed by
Instream Assessment: Oarika/ridifte19-yu Date:
Regional Supervisor: C /� s (-Th Date: — `-t - (-A
Permits & Engineering: / �Gx��trt tiN��' Date: /16
RETURN TO TECHNICAL SUPPORT BY:
MAR 1996

3
TOXICS/METALS/CONVENTIONAL^, PARAMETERS 00 111� Xj C4
mi d! IAn_/u ft •Y�I
Recommended Limit:
Existing Limit:
Monitoring Schedule:
Existing Limits
Flow (MGD):
Oil and Grease (mg/L):
TSS (mg/L):
pH (S.U.)
Flow (MGD):
Free Available Chlorine
(ug/L):
Chromium (ug/L):
Zinc (ug/L):
Barium (ug/L):
Lead (ug/L):
Copper (ug/L):
pH (S.U.)
126 Priority Pollutants
pH (S.U.)
Recommended Limits
Flow (MGD):
Oil and Grease (mg/L):
TSS (mg/L):
pH (S.U.)
Flow (MGD):
Free Available Chlorine
(ug/L):
Chromium (ug/L):
Zinc (ug/L):
Barium (ug/L):
Copper (ug/L):
pH (S.U.)
126 Priority Pollutants
pH (S.U.)
Outfall
Monthly Avg.
monitor
15.0
30.0
6ci.ocLt.Ci tc. (77
r No -joy, oX ( ems c rL tip
Pa!7f, ley+ 6hod(CL J<
i rctudt d oit. ,Qt 0 ,
as (N-(au)
Coe e
Outfall
Monthly Avg.
monitor
200
monitor
monitor
monitor
6.8-8.5
Outfall
Monthly Avg.
Outfall
Monthly Avg.
monitor
15.0
30.0
Outfall
Monthly Avg.
monitor
200
monitor
monitor
6.8-8.5
Daily Max. rud,- tti.
20.0 50.0 // i_ S fae //� liyG/iar, rs
6.8-8.5 y/t cp L L eo /fry e4N � /7e
Daily Max.pc��0SQ fl P Leo ce4a/
002
S V.0 pro v
500 e eon -c //re v i ll'e s e vo / 1 /,‘
50.0 //e.,,, of power j )As
1000 fare tow Ua(vim.e6,00/1t.6D'/
and A S A-Iyt S ©" e4.e
1-71 1
/ s � �rrw7 /h r.✓71yn / j�
7oX /`c 7 y fcs T 'hq �;vt� K /14c L2
003 /77 ea 11 / / T u l Jam, ,•prQ le'C_/ice.-.
Daily Max.
6.8-8.5 er�9h /3/h S Gr.Z/ATt-
t) x 1 diS
Lqs t'Ci
001 '
Daily Max. 3-4/-16
20.0
50.0
6.8-8.5
002
Daily Max.
500
50.0
1000
Outfall 003
Monthly Avg. Daily Max.
6.8-8.5
N/A
N/A
N/A

4
Limit Changes due to:
1993-1995 DMR data indicate that lead concentrations are consistently below the standard detection
level of 10 ug/L. Therefore continued monitoring for Pb is not recommended. The priority
pollutant analysis is a requirement per 40 CFR 423.13(d)(1).
Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
No parameters are water quality limited, but this discharge may affect future allocations.
INSTREAM MONITORING REQUIREMENTS
Upstream Location: N/A
Downstream Location: N/A
Parameters: N/A
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?

5
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach updated evaluation of facility, including toxics analysis, modeling analysis if
modeled at renewal, and description of how it fits into basinwide plan)
Additional Information attached? _ (Y or N) If yes, explain with attachments.

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EFFLUENT GUIDELINE LIMITATIONS
REVISED 01/14/96
Cogentrix - Southport
N C 0065 099
Waste Flow Source
Daily Max. (MGD)
Mo. Avg. (MGD)
Oulfall
Low Volume Waste
2.785
0.954
001
Coal Pile Runoff
0.09
__ Q01
Cooling Tower Blowdown
0.486
0.225
002
OUTFALL 001
see: rA4 t- \c Ow
Effluent Parameter
EPA Limitations in 40 CFR
(mq/l
EffluentLimita
(Ibel day)
Comments
Daily Max
30 day avg.
-
Daily Max
30 day avg.
pH (s.u.)
6.0-9.0
6.8-8.5
6.8-8.5
NC Saltwater WO Standard
TSS (low vol. sources)
100.00
30.00
2322.69
238.69
BPT, 40 CFR 423.12(b)(3)
TSS (coal pile runoff)
50.00
0.00
37.53
0.00
BPT, 40 CFR 423.12(b)(9)
Cumulative
TSS (lbslday):,
2360.22
238.69
Oil and Grease (low vol.)
20.00
15.00
464.54
119.35
BPT, 40 CFR 423.12(b)(3)
OUTFALL 002
Effluent Parameter
EPA Limitations in 40 CFR
(mq/11,
EffluentLimits
(mg/It
Daily Max
30 day avg.;
Comments
Maximum
Average
pH (s.u.)
6.8-8.5
6.8-8.5
NC Saltwater WO Standard
Free Avail. Chlorine
0.50
0.20
0.50
0.20
BPT, 40 CFR 423.13(d)(1)
Total Chromium
0.20
0.20
0.20
0.20
BPT. 40 CFR 423.13(d)(1)
Total Zinc
1.00
1.00
1.00
1.00
BPT, 40 CFR 423.13(d)(1)
126 Priority Pollutants'
•
BPT, 40 CFR 423.13(d)(1)
Note: Mass limits are given at outfall 00.1 since waste streams subject to different limitations are combined in the low
volume waste treatment basin prior to discharge. Concentration limits are given at outfall 002 since the cooling
tower blowdown is not co -mingled or diluted prior to discharge.
• The facility shall be subject to monitoring and reporting any of the 126 Appendix A priority pollutants which
may be contained in chemicals added for cooling tower maintenance. Compliance with the limitations for the 128
priority pollutants may be determined by engineering calculations which demonstrate that the regulated pollutants
are not detectable in the final discharge by the analytical methods in 40 CFR part 136.
e -n1 c S
1 9 AA 'f V. t Met. K W a SLe. G � . t �. �u.� M.a - tF 40 C$s 44 /Pe-
1)wAL,-/-6 Mw-x g , 3 g' J

jRN 12 '96 04:14PM COGENTRIX CHARLOTTE
•
P.1/4
COGENTRIX ENERGY, INC
9405 Arrowpoint Blvd.
Charlotte, NC 28273-8110
FAX COVER SHEET
DATE: January 12, 1996 TIME: 4:13 PM
TO: Jeanette Powell PHONE:
NC DEf INR FAX: [phone]
FROM: Steve Ipoyon PHONE: [phone]
Cogent& Energy Fax: [phone]
RE: NPDE$ Permit Renewals (#85099,58271,and 58297)
cc: File: 1.1.2 KV
Number of pages Including cover sheet: 4
Message
Jeanette, per our telephone conversation on Jan, 9, use, i am faxing you the
following:
• Design water balance for Southport Facility
• Design. water balance for Elizabethtown Facility
As you will note, the water balances are similar in structure. I have not included one for
Kenansville, but it.would be almost identical to Elizabethtown's. In addition, I have also
provided a table of flow values for the individual outfalls. Please note that, in addition
to reporting the daily maximums (which can tend to spike), I have provided an average
daily maximum based upon an average of the period of record daily maximums. This
provides a more realistic idea of the maximum monthly flow from the facility. Also note
that the period of record's reported do not necessarily correspond to the entire DMR
record. We have rot completed our database, however the numbers provided reflect
the most recent 5 .years worth of data at a minimum. Please call me if you have any
other questions. •
•

Low
vol.
w Qs�
cco(ts-t
(21Atio,Nel
JAN 12 '96' 04:14PM COGENTRIX CHARLOTTE
Oogentrix Energy, Inc.
Elizabethtown, Kenansvilla, and Southport NPDES Permit Renewals (1996)
Discharge flow values
00'l DutfaII Average
Avg. Daily Max.
Max Daily
002 Dutrall Average
Avg. Daily Max.
Max. Daily
003 Outfall Average
Avg. Daily Max,
Max. Daily
G8a-11
Flows (ell values are mq
Elizabethtown Kenanaville / Southport
11 /20 11 /95 1 /90 -11 /95
0.146 0.604
0.215 0.945
0.356 2.785
(4/864.6/15)
6.
0.172
0.372
0.074
0.119
0.401
0.139
0,228
0.388
0.026
0.070
0.564
0,164
0.223
0.406
0.168
0.225
0.486
0.436
0.720
2,299
P. 4/4
Note: Average = period of record average of reported monthly average flow.
Avg. Daily Max = period of record average of monthly max. flows
Max Daily = Maximum of period or record daily maximum flows.
Also note that Southport's 003 values were calculated based on 001 and 00)
flow values since 003 flow is not monitored.
1

SOC PRIORITY PROJECT: No it
To: Permits and Engineering Unit
Water Quality Section
Attention:Jeanette Powell (Review Engineer)
Date: 2/16/96
NPDES STAFF REPORT AND RECOMMENDATION
County: Brunswick
Kermit No. NC0065099
PART I - GENERAL INFORMATION
1. Facility and Address: Cogentrix of North Carolina
P. 0. Box 10836
Southport, NC 28461
2. Date of Investigation: 2/15/96
3. Report Prepared by: Steve West
4. Person Contacted and Telephone Number:
Craig Chasten [phone]
Steve Webber [phone]
fr
�NM
5. Directions to Site: Take NC Hwy 133 south, turn south on NC
Hwy 87. Turn left on NCSR 1526, proceed to end and turn left
on NCSR 1527. Entrance is 0.5 mile on 1527.
6. Discharge Point:
Latitude: 33° 57' 09" Longitude: 78° 01' 15"
USGS Quad No: L 26 NE USGS Quad Name: Southport, NC
7. Site size and expansion area consistent with application?
N/A
8. Topography: The site slopes gently to the northwest and is
approximately 25 feet msl.
9. Location of nearest dwelling: Approx. 0.5 mile.
10. Receiving stream or affected surface waters: Outfall is to the
CP&L effluent canal which is tributary to the Atlantic Ocean.
a. Classification: Class "SB" waters
b. River Basin and Subbasin No.: 03 06 17
c. Describe receiving stream features and pertinent
downstream uses: Man-made canal built by CP&L to
transport cooling water from the Brunswick nuclear
generating facility to the ocean.

PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: No limits
b. What is the current permitted flow limit? No limits
c. Actual treatment capacity of the current facility:
Primary treatment consists of two parallel 0.5 MG
settling basins.
d. Date and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: None.
e. Please provide a description of existing wastewater
treatment facilities: Treatment of various sources as
described below consists of physical settling of the low
volume waste stream in parallel 0.5 MG concrete -lined
basins and pH adjustment of the regeneration backwash of
the raw water treatment ion exchange filters and pH
adjustment of the final combined effluent. The various
waste streams are as follows:
Ion exchange filter regeneration
and carbon filter backwash: 35,750 gpd
- Boiler blowdown: 28,168 gpd
- Coal pile runoff: 49,689 gpd (large rain
events)
Misc. plant sumps: 46,393 gpd
Cooling tower blowdown: 157,000 gpd
TOTAL AVERAGE DISCHARGE: 317,000 gpd
f. Please provide a description of proposed wastewater
treatment facilities: No proposed changes.
g. Possible toxic impacts to surface waters: Biocides used
in the cooling towers are chlorine (10 lb gas per day)
Y
and BETZ slimicide C-74 (2.5 gpd). Both have been
approved at these feed rates according to Cogentrix.
h. Pretreatment Program: Not a municipality
2. Residuals handling and utilization/disposal scheme:
Residuals consist of flyash and material removed from the
settling basins. Flyash is used as construction fill by KBK
Enterprises in Leland, NC.
3. Treatment plant classification: Class II
4. SIC Code: Primary - 4911
Secondary - 4961
Wastewater Code: 16, 17, 22, 68, 70
Main Treatment Unit Code: 502X1

PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved? No
2. Special monitoring or limitations requests: No additional
requests.
3. Important SOC, JOC or Compliance Schedule dates: N/A
4. Alternative Analysis Evaluation: Not evaluated.
5. Other Special Items: None
PART IV - EVALUATION AND RECOMMENDATIONS
Cogentrix is a coal-fired power generation plant which has an
output capacity of 110 megawatts/day and sells steam to an adjacent
industry at an average rate of 3,800,000 lbs/day. Various waste
streams are described along with a water balance as shown on the
attached diagram. There are three separate sampling points defined
as 001, 002, and 003. The sampling point at 003 is representative
of the effluent which leaves the site and discharges into the CP&L
canal. The plant has operated over the past year with one effluent
limit violation (oil & grease 9/95 at 001) according to reports
submitted by the Permittee.
It is recommended that a draft permit be prepared and placed
at public notice. If no significant adverse public comment is
received, it is recommended NPDES Permit No. NC0065099 be
reissued to Cogentrix of North Carolina in accordance with the
Cape Fear River basin -wide permitting strategy.
t3 . L.J -Z - 1 6 - °l b
Signature of report preparer Date
�Wa t c
Quality Regional Supervisor
cc: Technical Support Branch
Wilmington Regional Office Files
Central Files
/64',/,,ot, /55
Date

966 T-S T-833
v
w
N
£ T06 b8t7 b08
0
Water Balance
Cogentrix of North Carolina, Inc.
Southport, NC
1,928,499 gpd
----- Municipal Water Supply
.50PT1c rtAft)K 2,000 gpd
2,000 gpd Sanitary]
281,116
gpd a
Consumption
391,427 gpd
P N (NA jvs-1 ti-
0.
35,750 gpd
Demineralizer
46,393 gpd
Boilers
to.
28,168 gpd
Blowdown
Doal Pile;
Runoff 149,689 gpd
'Miscellaneous
Plant Sumps
46,393 gpd
Low Volume
Waste Basin
001
160,000 gpd
11537,072 gpd
Evaporation
1,358,208 gpd
Cooling Tower
r ---
002
157,000 gpd
e Lk
NPDES Discharge
317,000 gpd
RRISPISPNPDESL2/15196

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NPDES PERMIT
QUAD SHEET .
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