NC0004987_Permit Modification_20000515

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
May 15, 2000
Ms. Angela M. Grooms, Manager
Water Protection
Duke Power
Group Environment, Health �Q Safety
15539 Hagers Ferry Road
Huntersville, North Carolina 28078-7929
A 0 •
NCDENR
NORTH CAROLINA DEPARTMENT OF-
ENVIRONMENT
FENVIRONMENT AND NATURAL RESOURCES
Subject: NPDES Permit Modification
Dan River — Permit No. NC0005468
Allen — Permit No. NC0004979
Marshall — Permit No. NC0004987 ;
Riverbend — Permit No. NC0004961
Dear Ms. Grooms:
The Division issued NPDES permit numbers NC0005468. NC0004979. NC0004987, and
NC0004961 on April 25, 1997, September 4, 1996, August 51, 1995. and July 29, 1996 respectively. The
Division has reviewed your request for permit modification at the subject facilities. Specifically, you requested
that all sump overflows as outlined in your December 1, 1999 correspondence be permitted as individual
outfalls. In accordance with your permit modification request the Division is forwarding herewith
modifications to the subject permits. These permit modifications incorporate effluent sampling requirements
for sump overflows in accordance with the permitting strategy developed for Buck Steam Station.
Enclosed please find the modified NPDES permit pages. These pages should be inserted into the
respective permits and the old ones discarded- These permit modifications are issued pursuant to the
requirements of North Carolina General Statute 145-215.1 and the Memorandum of Agreement between
North Carolina and the U. S. Environmental Protection Agency dated December 6, 1985.
Please take notice that these permits are not transferable. Part 11, E.4. addresses the requirements
to be followed in case of change in ownership or control of this discharge. These permits do not affect the
legal requirement to obtain other permits which may be required by the Division of Water Quality or permits
required by the Division of Land Resources, Coastal Area Management Act or any other Federal 'or Local
government permit that may be required.
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - SO% RECYCLED/ 10% POST -CONSUMER PAPER

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If you have any questions concerning these modifications, please contact Mr. Mark McIntire at
telephone number (9 19) 733-5083, extension 553.
Sincerely
74�
err T. Stevens
Enclosures: modified permit pages
Cc: Central Files (correspondence, letter, modified permit pages)
NPDES Permit Filei,(correspondence, letter, modified permit pages)
Mooresville Regional Office (letter, modified permit pages)
Winston-Salem Regional Office (letter, modified permit pages)
Point Source Compliance/Enforcement Unit (letter)

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NCDENR/DIVISION OF WATER QUALITY
Water Quality Section/NPDES Unit
October 9, 1998
MEMORANDUM
To: Dave Goodrich
From: Mark McIntire
Subject: Sump'Overflows
Duke Power Fossil Plants
I have been in discussions for quite some time with John Mease and Angela Grooms of Duke Power Company regarding
sump overflow issues. NPDES permits for Allen, Buck, Dan River, Marshall, and Riverbend steam stations do not
currently accommodate these overflows. Our discussions have been aimed at finding a .practical, protective way of
handling these situations.
Earlier in the year, I instructed Duke Power to grab a series of eight samples from the sump at Buck Steam Station
over a two week period (these sumps are those that deliver wastewater to the ash basins)_ Duke collected the samples
and subsequently forwarded the results, attached, to our office on March 27, 1998. The data is indicative of an ash
basin discharge with the exception of relatively high solids and iron. Incidents of high iron and TSS were likely due to
heavy rains agitating sediment prior to raw water intake.
These sump overflows occur in small volumes and on rare occasions. In light of the very high stream flows associated
with the streams into which Duke discharges, the impact from these sump overflows is very likely minimal to zero. As
such, I recommend permitting these sump overflows as a serial numbered outfall with appropriate monitoring installed
typical of that required at ash basin discharges. Furthermore, as these sump overflows are 'relatively consistent from
facility to facility, I do not think it's necessary to require characterization of the other four facilities_. Attached is a
letter to Duke Power to that affect. As this proposition would involve the permitting of -an additional outfall, we would
likely need to proceed with the major modification route. In addition to monitoring for these overflows, I propose that
we require 'Duke Power to make every reasonable attempt to minimize the occurrence of these overflows. We should
also require Duke to'make every reasonable attempt to redirect these overflows to the respective ash basins.

Re Doke Power Sump.Overflow...
Subject: Re: Duke Power Sump Overflow...
Date: Mon, 01 May 2000 13:46:41 -0400
From: Larry Coble <[e-mail]>
Organization: NC DENR Water Quality
To: Mark McIntire <[e-mail]>
This sounds fine to the WSRO.
Mark Mcintire wrote:
Gentlemen,
You may remember corresponding with me about sump overflows at Duke
Power fossil plants. Working with Duke Power at Buck Steam Station, we
developed a strategy for permitting the yard sump overflows they were
experiencing. These overflows occur very rarely (perhaps once per year)
and typically involve de minimus flows. However, given the current
legal and third part climate, Duke would like to have these overflows
permitted at Allen, Dan River, Riverbend, and Marshall as well.
As a refresher, we required episodic sampling for pH, TSS, fecal
coliform, and iron. Episodic being defined as any overflow lasting
longer than 1 hour. All overflows will be reported to regional office
staff within the required timeframe. Iron will be analyzed if the TSS
sample is reported as greater than or equal to 100 mg/L. Fecal coliform
will only be required for those yard sumps receiving sanitary
wastewater.
The ultimate goal is to eliminate all overflows completely. Until that
time, permitting these as outfalls with analytical requirements provides
Duke with a level of comfort in the context of third party litigation
and the Division's new overflow policy.
Let me know if you have concerns regarding this matter. My plan is to
handle these as minor modifications to the fossil plant permits
referenced above.
Thanks for your assistance.
Mark
Mark D. McIntire
Environmental Engineer
NPDES Unit - Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
[phone], extension 553
malIto:[e-mail]
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Power,
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December 1, 1999
Mr. David A. Goodrich
NCDENR/NPDES Unit
Water Quality Section
1617 Mail Service Center
Raleigh, NC 27699-1617
I
Subject: Permitting Sump Overflow Pipes
Plant Allen Permit No. NC0004979
Dan River Steam Station Permit No. NC0003468
Marshall Steam Station Permit No. NC0004987
Riverbend Steam Station Permit No. NC0004961
Record #: NC -005157
Certified: Z 335 554 746
Dear Mr. Goodrich:
Duke Power
Group Environment, Health & Safety
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
Duke Power requests that the overflow pipes for the yard sumps listed below be
permitted in the same manner as detailed in the draft NPDES permit (NC0004774) for
Buck Steam Station Outfall #002A. That outfall page is attached. Plant Allen's coal yard
sump and Riverbend Steam Station's yard sump are the only sumps containing sanitary
waste. Duke Power requests that only these two sumps be required to monitor for fecal.
Station
Sump
New Outfall Number
Allen
Coal yard
#002A
Power House
#002B
Dan River
Yard
#002A
Marshall
Sump 1
#002A
Sump 2
#002B
Riverbend
Yard
#002A
See the attached site maps for location of the sump overflow discharges. Should you
have questions or need additional information, please contact John Mease at (704) 875-
5347.
Sincerely,
a M
U
I '
Angela M. Grooms ` f
Manager, Water Protection
jrm DENR _
cc: Mr. L
Larry Coble, NCDENRex Gleason, RMooresville,
Wi Winston-Salem, N.C.

Permit No. NC0004987
SUPPLEMENT TO PERMIT COVER SHEET
Duke Power Company
is hereby authorized to:
Continue to discharge once -through cooling water and intake screen
backwash (outfall 001); ash -settling basin discharge (outfall 002) and sump
#s 1 and 2 overflows (outfalls 002A and 002B) — each consisting.of domestic
wastewater, ash removal lines, stormwater runoff, and metal cleaning
wastewater, and non -contact cooling water (outfall 003) located at Marshall
Steam Station, at the intersection of N.C. Highway 150 and NCSR 1841,
Terrell, Catawba County, and
2. Discharge from said treatment works at the location specified on the attached
map into the Catawba River (Lake Norman) which is classified WS -IV, B,
CA waters in the Catawba River Basin.

A (3). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL Permit No. NC0004987
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number 002iA v
—Sump #1 Overflows. Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT:CHARACTERISTIGS
DISGHARCIr IIM)TATIUNS
MQNITOR)NG REQUIREMENTS
Measurement`
Sample
Monthlyve.rage Dally Maximum
Frequency '..,
-Samp-Ie Type
�' .Locat onl,
Flow (MCD)
Episodic
Estimate
E
PH
Episodic
Grab
E
Total Suspended Solids
Episodic
Grab
E
Iron
See Footnote 2
Grab
E
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
ALL FLOWS WILL BE REPORTED ON MONTHLY DMRS. SHOULD NO FLOW OCCUR DURING A GIVEN MONTH, THE WORDS "No FLOW" SHOULD BE CLEARLY WRITTEN ON THE FRONT OF THE DMR.
EPISODIC SAMPLING IS REQUIRED PER OCCURRENCE WHEN SUMP OVERFLOWS OCCUR FOR LONGER THAN ONE HOUR, ALL SAMPLES SHALL BE OF A REPRESENTATIVE DISCHARGE.
NOTES:
I Sample Locations: E — Effluent: Effluent sampling shall be conducted at a point upstream of discharge to the receiving stream.
2 Sampling for iron is required when TSS is reported as greater than 100 mg/L.

A (4). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL Permit No. NC0004987
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number 002B
Sump #2 Overflows. Such discharges shall be limited and monitored by the Permittee as specified below: '
EFFLUENT CHARACTERISTICS
DISCHARGE LIMITATIONS
MONITORING REQUIREMENTS
Mon thly°Average Datly Maxtmum,
Measurement; Sample
Freq.ue,ncy Sample Type Locations
Flow (MGD)
Episodic Estimate E
pH
Episodic Grab E
Total Suspended Solids
---i—See
Episodic Grab E
Iron
Footnote 2 Grab E
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
ALL FLOWS WILL BE REPORTED ON MONTHLY DMRS. SHOULD NO FLOW OCCUR DURING A GIVEN MONTH, THE WORDS "NO FLOW" SHOULD BE CLEARLY WRITTEN ON THE FRONT OF THE DMR.
EPISODIC SAMPLING IS REQUIRED PER OCCURRENCE WHEN SUMP OVERFLOWS OCCUR FOR LONGER THAN ONE HOUR. ALL SAMPLES SHALL BE OF A REPRESENTATIVE DISCHARGE.
NOTES:
I Sample Locations: E — Effluent; Effluent sampling shall be conducted at a point upstream of discharge to the receiving stream.
2 Sampling for iron is required when TSS is reported as greater than 100 mg/L.

A. (5). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0004987
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall(;)
serial number 003, non -contact cooling water discharge from induced draft fan control house. Such discharges shall be limited and monitored by the
Permittee as specified below:
Effluent Characteristics
Flow
Temperature'
Total Residual Chlorine"'
Free Available Chlorine"'
Discharge Limitations Monitoring Requirements
lbs/day Units (specify) Measurement Sample
Monthly. Avg, Daily Max. Monthly. Avg. Daily Max. Frequency _ Type
Sample locations: E - Effluent
0.2 mg/I 0.5 mg/I
Sample
Location
** The temperature of the effluent shall be such as not to cause_ an increase in the temperature of the receiving stream of more than 2.8°C and in
no case cause the ambient water temperature to exceed 29°C.
*** Monitoring requirements apply only if chlorine is added to the cooling water. 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 free available chlorine
nor total residual chlorine at any one time.
There shall be no chromium, zinc, or copper added to the treatment system except as pre -approved additives to biocidal compounds. The Permittee
shall obtain approval authorization from the Division prior to utilizing any biocide in the cooling water (see. Part III, Condition F).
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units at the effluent.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

.PhDuke
IPowera
A Duke Energy Company
December 27, 1999
Mr. Charles H. Weaver, Jr.
NCDENR / Water Quality / NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Duke Power Company - Marshall Steam Station
NPDES Permit Renewal, NC#0004987 - Catawba County
CERTIFIED: Z 194 383 757
Dear Mr. Weaver:
Duke Power
Group Environment, Health & Safety
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
=-3DENR - WATER QUALI'
POINT SOURCE .9"
The above referenced permit expires June 30, 2000. GS 143-215.1(c) and Part II.B.10 of the subject permit
requires the submittal of an application for renewal at least 180 days prior to expiration.
Please find enclosed in triplicate, the application for renewal of the subject permit pursuant to 15 NCAC
213.0105(b). The following is requested:
• notification that the application is complete
• delete monitoring of pH levels and manganese concentrations at outfall 001, since these levels reflect
those observed in Lake Norman water samples collected from 60 feet below full pond (condenser
cooling water is withdrawn from Lake Norman between 60 and 70 feet below full pond into the
Marshall Steam Station intake cove)
• per previous discussion with NCDENR, change the thermal limit wording in the outfall 001 page of
the permit to reflect compliance reporting in October by stating "the thermal limit is a monthly
average discharge temperature limit of 93.9°F (34.4°C) July 1 through September 30, and 91.9°F (33.3
°C) the rest of each year" instead of "the thermal limit is a monthly average discharge temperature
limit of 93.9°F (34.4°C) July 1 through October 15, and 91.9°F (33.3°C) the rest of each year".
• reduce pH and flow monitoring to monthly from the current weekly requirement and delete
requirements for monitoring zinc and conducting annual pollutant analysis at outfall 002.
Please note that current data are used throughout the NPDES application where available. In addition,
supplemental information is enclosed to reflect conditions for the station. This information is
representative of station operation for the period from July 1998 through June 1999.
Should you have any questions or desire additional information, please contact Ron Lewis [phone]
or me [phone].
Very Truly Yours,
A,�-,( -7� A4-��
Angela M. Grooms
Manager, Water Protection