NC0004979_Portable Cooling Tower Request_20010410

PDuke
Power.
A Duke Energy Company
April 10, 2001
17=Mr._Mike_Myers_
North Carolina Department Environment and
Natural Resources
NPDES Unit
1618 Mail Service Center
Raleigh, NC 27699-1618
SUBJECT: Portable Cooling Tower Request
Plant Allen NPDES Permit # NC0004979
Buck Steam Station NPDES Permit # NC0004774
Marshall Steam Station NPDES Permit # NCO004987
Record Number: NC -005157
Certified: 7000 1670 0003 3252 8387
Dear Mr. Myers:
Duke Power
Group Environment, Health & Safety
MG03A5
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
Duke Power requests the approval of a pilot study using portable cooling towers to
provide additional cooling to the once -through, non -contact cooling water (CCW) at three
of our stations. The three stations are Plant Allen, Buck Steam Station and Marshall
Steam Station. The cooling towers will be used during the months of June, July, August
and September. The cooling towers for Plant Allen may be rotated to Marshall Steam
Station, with Plant Allen using the towers during June, July and August. If the towers are
moved to Marshall Steam Station, this move would occur at the end of August and be
used there for September each year. Duke Power requests the pilot study to begin on
June 1, 2001 and last through October 31, 2002.
When the portable cooling towers are in full operation, a portion (<15%) of the CCW
water will be removed from the discharge pipe and cooled before it reaches the
compliance monitoring point. There are currently no plans to use chemicals or have a
blowdown discharge.
It is also requested to move the thermal compliance point for Plant Allen 75 yards down
stream in the discharge canal to account for the return line.
John Mease and Ty Ziegler of Duke Power met with Mike Parker of NCDENR,
Mooresville Regional Office, on April 9, 2001 to discuss the proposed Pilot Study. Mr.
Parker was unaware of any potential water compliance issues or adverse environmental
impacts associated with this project. A vendor brochure with additional information on
the portable cooling towers was left with Mr. Parker, see attached.
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Duke Power requests the approval of a pilot study using portable cooling towers to
provide additional cooling to the once -through, non -contact cooling water (CCW) at three
of our stations. The three stations are Plant Allen, Buck Steam Station and Marshall
Steam Station. The cooling towers will be used during the months of June, July, August
and September. The cooling towers for Plant Allen may be rotated to Marshall Steam
Station, with Plant Allen using the towers during June, July and August. If the towers are
moved to Marshall Steam Station, this move would occur at the end of August and be
used there for September each year. Duke Power requests the pilot study to begin on
June 1, 2001 and last through October 31, 2002.
When the portable cooling towers are in full operation, a portion (<15%) of the CCW
water will be removed from the discharge pipe and cooled before it reaches the
compliance monitoring point. There are currently no plans to use chemicals or have a
blowdown discharge.
It is also requested to move the thermal compliance point for Plant Allen 75 yards down
stream in the discharge canal to account for the return line.
John Mease and Ty Ziegler of Duke Power met with Mike Parker of NCDENR,
Mooresville Regional Office, on April 9, 2001 to discuss the proposed Pilot Study. Mr.
Parker was unaware of any potential water compliance issues or adverse environmental
impacts associated with this project. A vendor brochure with additional information on
the portable cooling towers was left with Mr. Parker, see attached.

..,.-
t L ; ,_

s
Near term -forecast predictions indicate a continuation of abnormally dry conditions with
below normal rainfall. Duke Power requests approval of this Pilot Study by April 24,
2001, to assure adequate electrical supply, while maintaining thermal limits, and
protecting the environment.
If you need further clarification on this request, please contact John Mease at (704) 875-
5347. Thank you in advance for your prompt consideration.
Sincerely,
Michael A. Ruhe, Manager
Water Compliance
cc: Mike Parker — NCDENR, Mooresville Regional Office

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Duke
dkr Power.
A Duke Energy Company
Decembe 000
Mr. David Goodr'
ina Departmentof Environment,
Health, and Natural Resources
Division of Water Quality
1617 Mail Service Center
Raleigh, NC
27699-1617
Subject: Plant Allen Steam Station
NPDES Permit# NC0004979
Ash Basin Capacity Verification
Certified 7099 3400 0001 7791 9822
Dear Mr. Goodrich:
Duke Power
Group Environment, Health & Safety
MG03A5
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
0 EC 2 8 2000
DEHR - WATER QUALITY
POINT SOURCE BRANCH
While it is not required by our current NPDES permit we have undertaken to certify that adequate volume exists in
the ash basin to contain all solids expected to be deposited as well as adequate volume for containment of rainfall
runoff. Please find attached the ash basin capacity calculations for the Duke Power facility located in Gaston
County.
The attached calculations indicate that the ash basin is projected to have sufficient detention volume through the
year 2006. Current calculations indicate a need for 2,382.2 Acre -ft of volume through 2006 and an available volume
of 2,794 Acre -ft. '
The calculations are based on;
1. the most recent physical survey of the ash basin which was performed on January 8,1997;
2. monthly coal consumption data for estimated ash production from August, 1997 through November,
2000;
3. ENPRO base fuel consumption forecast (dated June, 1997) for ash production projections from
December, 2000, through December, 2006; and
4. an in-place density of 55 pounds of ash per cubic foot.
Please contact Robert Caccia at [phone] if you have any questions.
Respectfu I ly su bm itted,
4 (Z1VLe_1_
Michael A. Ruhe
Manager, Water Compliance
RWC/GDB
cc: w/attachment- ash basin calculation sheets
Mr. Richard Bridgeman NCDENR - Mooresville Regional Office
Don Scruggs Plant Allen Steam Station

r

Duke Power Company
Allen Steam Station -Ash Basin Forecasting
2000 Wet Weather Detention Volume Calculation
Determination of Wet Weather Detention Volume: Wet Weather Detention Volume is the sum of the
runoff accumulated in the ash basin which results from a 10 -yr 24 -hr storm (assuming 100% runoff)
plus the maximum 24 -hr dry weather waste stream which discharges to the Ash Basin (refer to
NPDES Permit NC0004979)
I. Estimate Runoff to the Ash Basin from a 10 -yr 24 -hr storm:
1. Natural Drainage Area of Ash Basin =
Station Yard Drainage Area Pumped to Ash Basin =
Total =
2. Precipitation from 10 -yr 24 -hr storm =
3: Total Stormwater Runoff to Ash Basin =
(Assuming 100% runoff)
Il. Estimated Maximum 24 -hr Dry Weather Waste Stream Discharging to Ash Basin:
1. Maximum recorded Ash Basin Discharge =
2. Increase maximum daily disharge by 10% for
conservatism and convert units to acre-feet =
III. Wet Weather Detention Volume:
Sum of Parts I. and II. =
IV. Estimated quantity of solids (ash) to be discharged to the Ash Basin through 2006.
(Refer to Coal Consumption Data and ENPRO EN9706F1 Output - Base Fuel Consumption
Forecast.)
Note: NPDES Permit expiration date is 8/31/2001.
288.0 Acres
40.0 Acres
328.0 Acres
5.0 Inches
136.67 Acre-feet
21,000,000 Gallons/day
70.89 Acre-feet
207.55 Acre-feet
Time Period
Actual or
Estimated Coal
Consumption
(1000's tons)
% Ash
Estimated Ash
Production
(1000's tons)
Estimated Ash
Production (Ac -
it) *
1997
2389
10.34%
246.97
206.17
1998
1579
10.16%
160.38
133.88
1999
2056
10.48%
215.52
179.91
1/1/2000 -11 /30/2000
2009
10.87%
218.34
182.27
1211/2000 -12/31/2000
195
10.87%
21.20
17.69
2001
2718
9.00%
244.58
204.17
2002
2878
9.00%
258.98
216.19
2003
3238
9.00%
291.38
243.24
2004
3391
9.80%
332.34
277.44
2005
2943
9.80%
288.37
240.73
2006
3336
9.80%
326.95
272.94
Total
26730.69
2605.00
2174.63
* Calculation assumes an in-place ash density of 55 lbs. per cubic foot.
** Assumes 25% of yearly projection is consumed in January and February.
AS Wet Weather Det Vol Calc.xls
1 12/20/00

Duke Power Company
r Allen Steam Station -Ash Basin Forecasting
2000 Wet Weather Detention Volume Calculation
V. Estimated Total Storage Volume Required for through 2006:
Wet Weather Detention Volume = 207.6 Acre-feet
Estimated Solids to Ash Basin = 2174.6 Acre-feet
Total = 2382.2 Acre-feet
Vl. Results:
Available Storage based on most recent basin survey dated 1/8/97 = 2794 Acre-feet
Required Storage Volume:
Through 12/31/2006 = 2382.2 Acre-feet
Based on these calculations, there is sufficient capacity in the ash basin to provide the
retention volume specified in the permit through the year 2006.
AS Wet Weather Det Vol Calc.xls
2 12/20/00

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
Ms. Angela M. Grooms
Manager, Water Protection
Duke Power
Group Environment, Health Q Safety
13339 Hagers Ferry Road
Huntersville, North Carolina 28078-7929
Dear Ms. Grooms:
FWA
IT1 • Rs�
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
November 19, 1999
Subject: Acid Drip System
Allen Steam Station
NC PDES�-PeTmit Number NC0004979�
Gaston County
The Division has reviewed the information submitted by John Mease of Duke Power regarding the
acid drip system installation at Allen Steam Station and has come to the conclusion that no Authorization to
Construct is necessary for this project. Furthermore, installation of a similar system for dosing caustic is
approved provided Duke documents the unit's installation and maintains records regarding dosing and pH.
Please note that this letter does not serve as blanket approval for similar installations at other Duke
facilities. The Division should be contacted prior to installing similar systems elsewhere. If you have any
questions or comments regarding this matter, please do not hesitate to contact Mark McIntire at telephone
number [phone], extension 553.
Sincerely
err T. Stevens
Cc: Central Files
-NPDES-Permit+ile-1
Mooresville Regional Office, Water Quality
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/ 10% POST -CONSUMER PAPER

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality Y .
James B. Hunt, Jr., Governor ;
-Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
October 12, 1998
Ms. Angela Grooms
Manager, Water Protection
Duke Power
13339 Hagers Ferry Road
Huntersville, North Carolina 28078-7929
N-CDENR
Subject: Sump Overflows
Duke Power Company
NC Fossil Plants
Dear Ms. Grooms:
The Division has reviewed the information submitted by Duke Power regarding sump overflows at
Allen. Buck,_ Dan River, Marshall, and Riverbend Steam Stations and accepts the characterization conducted at
Buck as adequate for the remaining four facilities due to the similarity of the sump water.
It is the Division's recommendation that the-NPDES permits for the above mentioned facilities be
modified to accommodate these sump overflows. The Division would treat these overflows as an additional
permitted outfall with monitoring require ments'indicative of those at the ash basin effluent. Additionally, the
Division -would ask that Duke Power, wherever possible, minimize these overflows either through collection or
diversion to the -ash basin.
As this request would involve the installation of an additional permitted outfall into the NPDES
permit, it would be considered a major modification and be. subject to all appropriate timelines and Statutory
requirements.
Should you have any questions or comments regarding this speculative limits request, please do not
hesitate to contact Mark McIntire at [phone], extension 553.
Sincerely,
David A. Goodrich
Supervisor, NPDES Unit
cc: Central Files (with attachments)
Mooresville Regional Office, Water Quality Section
Winston-Salem Regional Office, Water Quality Section
DF:S1ilnit?Fil //( _�� nts1 NC0004961, NC0004987, NC0003468, 04909C,"
NC0004774
P.O. Box 29535, Raleigh, North Carolina 27626-0535 - . Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled / 10% post -consumer paper

NCDENR/DIVISION OF WATER QUALITY
Water lQuality Section/NPDES Unit
October 9, 1998
MEMORANDUM
To: Dave Goodrich
From: Mark McIntire A44 -`A,
Subject: Sump Overflows
Duke Power Fossil Plan
I have been in discussions for quite some time w`th John Mease and Angela Grooms of Duke Power Company regarding
sump overflow issues. NPDES permits for Alle , Buck, Dan River, Marshall, and Riverbend steam stations do not
currently accommodate these overflows. Our di cussions 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 hi h 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 mpact from these sump overflows is very likely minimal to zero. As
such, I recommend permitting these sump overflo s as a serial numbered outfall with appropriate monitoring installed
typical of that required at ash basin discharges. F rthermore, as these sump overflows are relatively consistent from
facility to facility, I do not think it's necessary to r quire characterization of the other four facilities. Attached is a
letter to Duke Power to that affect. As this propo ition 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 ttempt to minimize the occurrence of these overflows. We should
also require Duke to make every reasonable atte
t to redirect these overflows to the respective ash basins.
�n
1

Mark,
Per our phone call,- attached is a list of waste streams at our NC Fossil sites that
have sumps with overflow pipes going to surface waters. Also included is a copy
of the letter (March 27,1998) with the results from the sump characterization
study done at our Buck Steam Station.
Please review this information and let us know what the permitting requirements
would entail.
Thanks for your help with this matter. .
John Mease

Sunhp Waste Streams
Allen Steam Station
Powerhouse Sump Wast6 Streams: (Overflows to River)
• Unit # 5 Boiler Rbom sump:
Floor wash water (O&G)
Boiler seal wa er
• Unit #3, #4, #5 I.Tduced Draft Motor Bearing Cooling Water
• Unit #3, #4, #5 lir Preheater wash water (iron) -
• Unit #3, #41 #5 hecker Plate wash/stormwaterash
O
• Unit #3, #4, #5 F�yash separator Tank overflow (ash)
• Surface drains north of Powerhouse
• 100,000 gallon Fuel Oil Storage Tank containment drain
• Groundwater remediation oil/water separator discharge
Yard Drainage Sump Waste Streams: (Overflows to CY Sump)
• Water Treatment ystem
Clarifier de+dge
Pressure filt r backwash
Activated ca bon filter backwash
Reverse Osmosis blowdown
Reverse OsrI osis Prefilter backwash
Demineral¢ r/regeneration discharge (neutral)
• Boiler Blowdown (hydrazine)
• Laboratory wastes
• Closed Cooling W ter leakage(biocides)
• Turbine NDE Testig discharge (corrosion inhibitor)
• Heat Exchanger cl aning discharge
• Unit #1, #2 Induce Draft Fan Motor Bearing Cooling Water
• Unit #1, #2, #3, #4 oiler Room Sumps
Floor wash Water
Boiler Seal Water
• Unit #1, #2 Air Pre eater Wash Water (iron)
• Chemical make-up anks and drum rinseate (hydrazine)
• Misc. Janitorial pro 'esses
9 Misc. stormwater d ,ains

Coal Yard Sump Waste Streams: (Overflows to River),
• Coal Pile Run-off
• Misc. Coal handling Sump Pump Discharges
• Sanitary (septic tank effluent)
• Possible overflow from Yard Drainage Sump
• Misc. stormwater drains
• Buck Steam Station
Yard Sump: (Overflows to the Yadkin River):
• Water Treatment System
Clarifier desludge
Gravity filters backwash
Activated carbon filters backwash
Demineralizer/regeneration discharge (neutral)
• Waterwall blowdown
• Continuous boiler blowdown
• Superheater drain lines
• Yard drains (stormwater)
• Coal pile runoff
• Sanitary waste
• Floor drains
• Sulfuric acid
• Sodium Hydroxide
• Water treatment chemicals
• Hydrazine .
• Oil
• Corrosion Inhibitions - -
• Laboratory Waste
• Oil/water separator discharge
• Microbiocides
• Industrial cleaning products

Dan River -3W
Yard Sump: (Overflows tb the Dan River)
• Yard drains (stor
• Coal pile runoff
• Miscellaneous p2
and light mainten
• Small amounts of
maintenance
Marshall 101
rking lot oil & gasoline (only leaks or spills
ance activities)
flyash from precipitator hopper
Sump 2: (Overflow to Lako Norman)
• Water Treatment System
Clarifier des udge
Gravity filter backwash
Activated cap bon filters backwash
Demineraliz r/regeneration discharge
• Closed system dr inage, cleanings, testing
• Boiler seal water
• Miscellaneous sys em leakage's
• Moisture separato s on air compressor precipitators
• Floor wash water
• Pyrite (ash) remov I system overflow
• Low volume waste ater
• Chemical makeup anks and drum rinsate
• Boiler blowdown
• Yard stormwater d ins
Sump 1: (Overflow to Lake Norman)
• Coal pile runoff
• Yard stormwater dr ins
Turbine room sump overflow

Riverbend 4�6
Yard Sump: (Overflow to Catawba River)
• Water Treatment System
Clarifier desludge
Gravity filters backwash
Activated carbon filters backwash
Demineralizer/regeneration discharge (neutral)
• Boiler Cleaning
• Water treatment chemicals
• Continuous boiler blowdown
• Superheater drain lines
• Yard drains (stormwater)
• Coal pile runoff
• Sanitary waste
• Floor drains
• Sulfuric acid
• Sodium Hydroxide
• Hydrazine
• Oil & gasoline (only from leaks or spills)
• Corrosion Inhibitions
• Laboratory Waste
• Oil/water separator discharge
• Microbiocides
• Industrial cleaning products
• Groundwater sump
• ID fans cooling water
• Chemical makeup tank drain lines
1. Hydrazine
2. Ammonium Hydroxide
3. NaOH -
4. Aluminum Sulfate
• Preheater bearing cooling water

- _eDike
Power
March 27, 1998
Mr. Mark McIntire
NPDES Unit
North Carolina Department of
Division of Water Quality
P. O. Box 29535
Raleigh, NC 27626-0535
Subject:
ment and Natural Resources
Buck Steam Station
Rowan County
NPDES # NC00047 4
Record #: BU -0048E3
Certified Mail: P 318 140 645
Dear Mr. McIntire:
Attached -are the -sample results
system at. Buck Steam Station. l
possible permitting of the sump's
1998.
As required, the sump was sample(
Tuesday, Wednesday and Thursda
parameters. When the samples we
normal plant waste streams. The to
operations with units on and off line
with heavy rains conditions (coal pil
Should you need additional
5347.
Sincerely,
Angela -M. Grooms
Manager, Water Protection
jrm . -
Duke Power
Getup EmdrVnment,-Heald, 6-Sa en
13339 H-9— Ferry Road
Hunter-ille, NC 28078-7929
acterizing the sump used in the waste treatment
characterization was -needed in regards to the
rflow pipe, see attached letter dated March 4,
eight times during a two week period on Monday,
at approximately two o'clock for -the requested
collected the sump was operating, receiving the
sampling events included normal plant
order dry weather and the units on and off line
run oft].
on, please contact John Mease at (704) 875 -
cc: John Lesley, Mooresville Regional Office NCDENR

Sump Results
Samples Collected 3/2-5/98 and 319-12/98
Sampling Date
02 -Mar -98
03 -Mar -98
04 -Mar -98
05 -Mar -98
09 -Mar -98
10 -Mar -98
11 -Mar -98
12 -Mar -98 ,
TSS mg/L
22.0
64.0
34.0
34.0
100.0
190.0
168.0
127.0
O&G mg/L
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
BOD mg/L
0.8
0.8
<2.0
<2:0
4.2
3.1
2.9
<2.0
Ammonia
mg-N/L
0.21
0.10
0.08
0.08
0.27
0.22
0.16
0.06
Total Arsenic
ug/L
<2.0
<2.0
<2.0
<2.0
<2.0
4.4
3.6
2.4
Total Copper
Mg/l.mg/L
0.038
0.041
0.061
0.008
0.035
0.023
0.026
0.027
Total Iron
1.613
1.826
1.583
1.251
5.564
10.84
6.718
4.698
Total
Total
Total
Sampling Date
Nitrogen
mg -NIL
Phosphorus
mg-P/L
Selenium
ug/L
pH (S.U.)
Temperature
,F
Weather
Unit Status
02 -Mar -98
03 -Mar -98
04 -Mar -98
05 -Mar -98
09 -Mar -98
10 -Mar -98
11 -Mar -98
12 -Mar -98
0.89
1..12
0.96
0.85
0.97
0.69
0.96
1.25.
0.097
0.123
0.100
0.296
0.140
0.210
0.270
0.170
<2.0
<2.0
<2.0
<2.0
<2.0
<2.0
<2.0
<2,0
7.35
8.16
7.44
7.49
6.1
6.83
6.97
7.28
58.6
60.3
56.8
56.3
57.2
61.2
55.9.
54.3
No Rain
Off
No Rain
Unit 5 On
No Rain
Unit 5 On
No Rain
Unit 5 On
Heavy Rain
Off
No Rain
Units 586 On
No Rain
Units 5&6 On
No Rairi
Units 5&6 On

PhDake
rPower_
AD.&E—rC—q-i
March 4, 1998
Mr. John Lesley
Department of Environment
Water Quality Section
Mooresville Regional Office
919 North Main Street
Mooresville, NC 28115
Subject: Buck Steam Sta
Rowan County
NPDES # NCOD
Record #: BU-Oi
Certified Mail: P
Dear Mr. Lesley:
Natural Resources
4774
9 635 422
Duke Power
13339 Hagecs Ferry Road
Huncusville. NC 28078-7929
As per a phone conversation b' tween yourself and John Mease (Duke Power),
John Mease talked to Mr. Mark McIntire (NCDENR, NPDES Unit) regarding the
possible permitting of the sump overflow pipe at Duke Power's Buck Steam
Station.
Mr. McIntire determined the following information would be required before a
decision could be made regardi g possible permitting and permit- limits on the
overflow pipe:
• Eight discrete samples to be
Monday, Tuesday, Wednesd
• Sample for the following par.
• Total Suspend(
• Oil and Grease
• Biochemical O)
• Ammonia
• Total Copper
• Total Iron
• Total Arsenic.
• Total Selenium
• Total Phosphor
• Total Nitrogen-
• pH
• Temperature
collected in the sump over a two week period on
ay and Thursday
,meters:: ,
d Solids
Demand. -

• Possible sampling at other Duke Power locations that have similar_ sump
design will be considered depending on the sample results.
The analytical results will be summarized and sent to Mr. McIntire. Upon the
State's review of the results a decision regarding permitting and possible permit
limits will be issued by Mr. McIntire. Mr. Mease will copy the Mooresville office
on all correspondences.
Should you have questions regarding this matter, please contact John Mease at
[phone].
Sincerely,
Angela M. Grooms
Manager, Water Protection
1r
cc: D. T. Shuping - Buck Steam Station
Mr. Mark McIntire - NCDENR

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E.,. Director
July 7, 1997
Mr. David F. Mitchell, Technical System Manager
Duke Power Company
Electric System Support
Water Protection
13339 Hagers Ferry Road
Huntersville, North Carolina 28078-7929
Dear Mr. Mitchell:
ALT.WYVA
IT
4
I DEHNF1
Subject: Flow Measuring Changes
- Duke Power NPDES Permits
The Division acknowledges receipt of your correspondance dated June 12, 1997 regarding flow,
measurement at Plant Allen, Belews Creek, Buck, Cliffside, Dan River, Marshall and Riverbend steam
stations. With this letter, the Division approves the proposed changes to the flow measurement equipment,
at the above referenced facilities. It is the Division's understanding that the proposed changes are being
made in order to improve flow measuring accuracy and to implement a consistent approach system -wide.
Should you have any questions concerning this matter, please do not hesitate to contact Mark
McIntire at [phone], extension 553.
Sincerely,
Lnt( __ l,
David A. Goodrich
NPDES Group Supervisor
cc: Central Files
Asheville Regional Office / Water Quality
Mooresville Regional Office / Water Quality
Winston-Salem Regional Office / Water Quality
Permits and Engineering Unit / NPDES Permit Files
NC0004979, NC0004774, NC0005088, NC0003468,
NC0004987, NC0004961, NCO024406
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper