NC0004987_Sump Overflows_19981012

State of North Carolina
Department of' Environment
and Natural Resources •
Division of Water Quality
James B. Hunt, -Jr.,. Governor
- Wayne McDevitt, Secretary
A. Preston Howard, Jr., RE., Director NCDENR
October 12, 1998
Ms. Angela Grooms
Manager, Water Protection
Duke Power
13339 Hagers Ferry Road
Huntersville, North Carolina 28078-7929
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 requirements 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,
-711
David A. Goodrich
Supervisor, NPDES Unit
cc: Central Files (with attachments)
Mooresville Regional Office, Water Quality Section
Winston-5alem Regional Office, Water Quality Section
.,DF;SViu Files (rvtth� txachmen s)'NC0004961 �NC0.0 940 87 NC0003468, NC0004979
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NC0004774
P.O. Box 29535; Raleigh, North Carolina 27626-0535 Telephone [phone] TAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled / 10% post -consumer paper

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.

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

Sump Waste Streams
Allen Steam Station q� � q
Powerhouse Sump Waste Streams: (Overflows to River)
• Unit # 5 Boiler Room sump:
Floor wash water (O&G)
Boiler seal water
• Unit #3, #4, #5 Induced Draft Motor Bearing Cooling Water
• Unit #3, #4, #5 Air Preheater wash water (iron)
• Unit #3, #41 #5 Checker Plate wash/stormwater (ash)
• Unit #3, #41 #5 Flyash 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 System
Clarifier desludge
Pressure filter backwash
Activated carbon filter backwash
Reverse Osmosis blowdown
Reverse Osmosis Prefilter backwash
Demineralizer/regeneration discharge (neutral)
• Boiler Blowdown (hydrazine)
• Laboratory wastes
• Closed Cooling Water leakage(biocides)
• Turbine NDE Testing discharge (corrosion inhibitor)
• Heat Exchanger cleaning discharge
• Unit #1, #2 Induced Draft Fan Motor Bearing Cooling Water
• Unit #1, #2, #3, #4 Boiler Room' Sumps
Floor wash Water
Boiler Seal Water
• Unit #1, #2 Air Preheater Wash Water (iron)
• Chemical make-up tanks and drum rinseate (hydrazine)
• Misc. Janitorial processes
• Misc. stormwater drains

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 3 _
Yard Sump: (Overflows to the Dan River)
• Yard drains (stormwater)
• Coal pile runoff
• Miscellaneous parking lot oil & gasoline (only leaks or spills
and light maintenance activities)
•. Small amounts of flyash from precipitator hopper
maintenance
Marshall e0
Sump 2: (Overflow to Lake Norman)
• Water Treatment System
Clarifier desludge
Gravity filters backwash
Activated carbon filters backwash
Demineralizer/regeneration discharge
• Closed system drainage, cleanings, testing
• Boiler seal water
• Miscellaneous system leakage's
• Moisture separators on air compressor precipitators
• Floor wash water
• Pyrite (ash) removal system overflow
• Low volume wastewater
• Chemical makeup tanks and drum rinsate
• Boiler blowdown _
• Yard stormwater drains
Sump 1: (Overflow to Lake Norman)
• Coal pile runoff
• Yard stormwater drains
9 Turbine room sump overflow

Riverbend
Yard Sump: (Overflow to Catawba River)
• Water Treatment System
Clarifier deslu_dge
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

L .uke
Power_
AD. eE�VCm pV —
March 27, 1998
Mr. Mark McIntire
NPDES Unit
North Carolina Department of Environment and Natural Resources
Division of Water Quality
P. O. Box 29535
Raleigh, NC 27626-0535
Subject: Buck Steam Station
Rowan County
NPDES # NC0004774
Record #: BU -004883
Certified Mail: P 318 140 645
Dear Mr. McIntire:
Duke Power
Group Enidroninent &Safer.
13339 Hagers Ferry Road
Hunce sville, NC 28078-7929
Attached are the sample results characterizing the sump used- in the waste treatment
system at Buck Steam Station. This characterization was needed in regards to the
possible permitting of the sump's overflow pipe, see attached letter dated March 4,
1998.
As required, the sump was sampled eight times during a two week period on Monday,
Tuesday, Wednesday and Thursday at approximately two o'clock for the requested
parameters. When the samples were collected the sump was operating, receiving the
normal plant waste streams. The two sampling events included normal plant_
operations with units on and off line under dry weather and the units on and off line
with heavy rains conditions (coal pile run oft).
Should you need additional information, please contact John Mease at (704) 875-
5347.
Sincerely, -
Angela M. Grooms
Manager, Water Protection
jrm - -
cc: John Lesley, Mooresville Regional Office NCDENR

Sump Results
Samples Collected 3/2-5/98 and 3/9-12/98
Sampling Date
TSS mg/L
0&G mg/L
130D mg/L
Ammonia
Total Arsenic
Total Copper
Total Iron
02 -Mar -98
22.0
<1.0
0.8
mg -NIL
0.21
ug/L
mg/L
mg/L
03 -Mar -98
64.0
<1.0
0.8
0.10
<2,0
<2.0
0.038
0.041
1.613
1.826
04 -Mar -98
34.0
<1.0
<2.0
0.08
<2,0
0.061
1.583
05 -Mar -98
34.0
<1.0
<2.0
0.08
<2,0
0.008
1.251
09 -Mar -98
100.0
<1.0
4.2
0.27
<2,0
0.035
5.564
10 -Mar -98
190.0
<1.0
3.1
0.22
4.4
0.023
10.84
11 -Mar -98
168.0
<1.0
2.9
0.16
3.5
0.026
6.718
12 -Mar -98
127.0
<1.0
<2.0
0.06
2.4
0.027
4.698
Total
Total
Total
Sampling Date
Nitrogen
Phosphorus
SeleniumH
S.U,
P ( )
Temperature
a
Weather
Unit Status
mg -NIL
mg-P/L
ug/L
F
02 -Mar -98
0.89
0.097
<2.0
7.35
58.6
No Rain
Off
03 -Mar -98
1..12
0.123
<2,0
8.16
60.3
No Rain
Unit 5 On
04 -Mar -98
0.96
0.100
72,0
7.44
56.8
No Rain
Unit 5 On
05 -Mar -98
0.85
0.296
<2.0
7.49
56.3
No Rain
Unit 5 On
09 -Mar -98
0.97
0.140
<2.0
6.1
57.2
Heavy Rain
Off
10 -Mar -98
0.69
0.210
<2.0
6.83
61.2
No Rain
Units 5&6 On
11 -Mar -98
12 -Mar -98
0.96
1.25
0.270
<2.0
6.97
55.9
No Rain
Units 5&6 On
0.170
<2,0
7.28
54.3
No Rain
Units 5&6 On

PDake
Duke Power-
Power- Gmup &zironmMr,. Health 6- Safe*
AD.&,E—VC—V-7 13339 Hagers Ferry Road
Hunrers%Ue, NC 28078-7929
March 4, 1998
Mr. John Lesley
Department of Environment and Natural Resources
Water Quality Section
Mooresville Regional Office
919 North Main Street
Mooresville, NC 28115
Subject: Buck Steam Station
Rowan County
NPDES # NC0004774
Record #: BU -004883
Certified Mail: P 399 635 422
Dear Mr. Lesley:
As per a phone conversation between 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 regarding possible permitting and permif limits on the
overflow pipe:
• Eight discrete samples to be collected in the sump over a two week period on
Monday, Tuesday, Wednesday and Thursday
• Sample for the following parameters:
• Total Suspended Solids
• Oil and Grease
• Biochemical Oxygen Demand.-
--
o Ammonia
• Total Copper
• Total Iron
• Total Arsenic
• Total Selenium
• Total Phosphorus
• Total. Nitrogen
. pH
• Temperature

• 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