Riverbend Steam Station (13)

PDuke
Energy®
May 9, 2011
Mr Bradley Bennett
Division of Water Quality
Stormwater Permitting Unit
North Carolina Department of Environment
and Natural Resources
1617 Mail Service Center
Raleigh, NC 27699 -1617
Subject NPDES Stormwater Permit Application
Riverbend Steam Station
Dear Mr Bennett
P _�7 -
CORPORATE EHS SERVICES
Duke Energy
526 South Church St
Charlotte, NC 28202
Mailing Address
EC13K / PO Box 1006
Charlotte, NC 28201 -1006
4c� 0 0 o5 L�q
Duke Energy requests a stormwater discharge permit for the Riverbend Steam Station located
in Gaston County, North Carolina Enclosed is a check from Duke Energy in the amount of
$860 00 for the subject stormwater permitting fee, and three sets of the following documents
related to this permit request
a EPA Form 1,
b EPA Form 2F, !fig
c EPA Form 2F Supplemental Information, LZDENR 1 2011
d Available stormwater analytical data,
e DWQ ROS Request Form, K f ROS Form Supplemental Information, armlo
g Site Location Map,
h Site Stormwater Plan Drawing
Numerous stormwater outfalls are located at the Riverbend Steam Station The accompanying
stormwater analytical data was obtained from samples collected at outfalls SW001, SWO02 and
SWO03 during the period June through September, 2008
Please contact me at Mark McGary@duke- energy com or at 704 - 634 -7098 if you have any
questions or need any additional information
Sincerely,
Mark McGary, P E
Environmental, Health & Safety
attachments
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E Does or will this facility treat, store, or dispose of
F Do you or will you inject at this facility industrial or
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municipal effluent- below the lowermbst' stratum
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containing, within one quarter mile of the well bore,
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G Do you or will you inject at this facility any produced
H Do you or will you,inject at thisifacility fluids for
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A NAME &OFFICIAL TITLE (type or print) B SIGN TURE,./
C DATE SIGNED
Terry L Taylor - General Manager 11 T-)
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COMMENTS
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EPA FORM 3510-1 (8-90)

EPA ID Number (copy from Item 1 of Form 1) Form Approved OMB No 2040 -0086
Please print or type in the unshaded areas only N00004 961 Approval expires 5 -31 -92
FORM
2F
NPDES
U S Environmental Protection Agency
Washington, DC 20460
43WEPA Application for Permit to Discharge Storm Water
Discharges Associated with Industrial Activity
Paperwork Reduction Act Notice
Public reporting burden for this application is estimated to average 28 6 hours per application including time for reviewing instructions searching existing data sources
gathering and maintaining the data needed, and completing and reviewing the collection of information Send comments regarding the burden estimate any other aspect
of this collection of information, or suggestions for improving this form including suggestions which may increase or reduce this burden to Chief Information Policy
Branch, PM -223, U S Environmental Protection Agency 1200 Pennsylvania Avenue NW Washington DC 20460 or Director Office of Information and Regulatory
Affairs Office of Management and Budget Washington DC 20503
I Outfall Location
For each outfall list the latitude and longitude of its location to the nearest 15 seconds and the name of the receiving water
A Outfall Number
(list)
B Latitude
C Longitude
D Receiving Water
(name)
See attached
See attached supplemental information
II Improvements
A Are you now required by any Federal, State, or local authority to meet any implementation schedule for the construction, upgrading or operation of wastewater
treatment equipment or practices or any other environmental programs which may affect the discharges described in this application? This includes but is not limited
to permit conditions administrative or enforcement orders, enforcement compliance schedule letters stipulations court orders and grant or loan conditions
1 Identification of Conditions
Agreements Etc
2 Affected Outfalls
3 Brief Description of Project
4 Final
Compliance Date
number
source of discharge
a req
b prof
N/A
B You may attach additional sheets describing any additional water pollution (or other environmental projects which may affect your discharges) you now have under
way or which you plan Indicate whether each program is now under way or planned and indicate your actual or planned schedules for construction
III Site Drainage Map
Attach a site map showing topography (or indicating the outline of drainage areas served by the outfalls(s) covered in the application if a topographic map is unavailable)
depicting the facility including each of its intake and discharge structures, the drainage area of each storm water outfall, paved areas and buildings within the drainage
area of each storm water outfall each known past or present areas used for outdoor storage of disposal of significant materials, each existing structural control measure
to reduce pollutants in storm water runoff materials loading and access areas areas where pesticides herbicides, soil conditioners and fertilizers are applied, each of
its hazardous waste treatment storage or disposal units (including each area not required to have a RCRA permit which is used for accumulating hazardous waste
under 40 CFR 262 34) each well where fluids from the facility are injected underground springs and other surface water bodies which received storm water discharges
from the facility
EPA Form 3510 -2F (1 -92) Page 1 of 3 Continue on Page 2

Continued from the Front
IV Narrative Description of Pollutant Sources
A For each outfall provide an estimate of the area (include units) of imperious surfaces (including paved areas and building roofs) drained to the outfall and an estimate of the total surface area
drained by the outfall
Outfall
Area of Impervious Surface
Total Area Drained
Curtail
Area of Imperious Surface
Total Area Drained
Number
(provide units)
(provide units)
Number
(provide units)
(provide units)
See attached supplemental
information
B Provide a narrative description of significant materials that are currently or in the past three years have been treated, stored or disposed in a manner to allow exposure
to storm water method of treatment, storage or disposal, past and present materials management practices employed to minimize contact by these materials with
storm water runoff materials loading and access areas, and the location, manner, and frequency in which pesticides, herbicides soil conditioners and fertilizers are
applied
See attached supplemental information
C For each outfall provide the location and a description of existing structural and nonstructural control measures to reduce pollutants in storm water runoff and a
description of the treatment the storm water receives including the schedule and type of maintenance for control and treatment measures and the ultimate disposal
of any solid or fluid wastes other than by discharge
Oulfall
List Codes from
Number
Treatment
Table 2F -1
See attached supplemental information
V Nonstormwater Discharges
A I certify under penalty of law hat the outfall(s) covered by this application have been tested or evaluated for the presence of nonstormwater discharges and that all
nonstormwater discharged from these outfall(s) are identified in either an accompanying Form 2C or From 2E application for the outfall
Name and Official Title (type or pnnt)
Signature
Date Signed
Terry L Taylor - General Manager II
B Provide a description of the method used the date of any testing and the onsite drainage points that were directly observed during a test
Visual inspection was performed on December 9, 2010 Stormwater outfalls were inspected following a period of dry weather of at
least 72 hours duration to determine if any process water was discharging
VI Significant Leaks or Spills
Provide existing information regarding the history of significant leaks or spills of toxic or hazardous pollutants at the facility in the last three years including the
approximate date and location of the spill or leak, and the type and amount of material released
Within the past three years there have been no significant spills or leaks of hazardous substances in excess of reportable
quantities set forth by Section 311 of the Clean Water Act or Section 102 of CERCLA
EPA Form 3510 -2F (1 -92) Page 2 of 3 Continue on Page 3

Continued from Pape 2 NC000 96iD Number (copy from Item 1 ofForm 1)
VII Discharge Information
A, B, C &D See instructions before proceeding Complete one set of tables for each outfall Annotate the outfall number in the space provided
Table VII -A VII -B VII -C are included on separate sheets numbers VII -1 and VII -2
E Potential discharges not covered by analysis — is any toxic pollutant listed in table 2F -2, 2F -3, or 2F -4, a substance or a component of a substance which you
currently use or manufacture as an intermediate or final product or byproduct?
❑ Yes (list all such pollutants below) Q No (go to Section IX)
VIII Biological Toxicity Testing Data
Do you have any knowledge or reason to believe that any biological test for acute or chronic toxicity has been made on any of your discharges or on a receiving water in
relation to your discharge within the last 3 years?
❑ Yes (list all such pollutants below) ❑✓ No (go to Section IX)
Toxicity testing has been conducted in association with NPDES wastewater discharge 002 No toxicity testing has been performed
for stormwater outfalls
IX Contract Analysts Information
Were any of the analyses reported in Item VII performed by a contract laboratory or consulting firm?
© Yes (list the name address, and telephone number of and pollutants
❑ No (go to Section X)
analyzed by, each such laboratory or firm below)
A Name
B Address
C Area Code & Phone No
D Pollutants Analyzed
Pace Analytical Services, Inc
9800 Kincey Ave, Suite 100
704 - 875 -9092
Oil and Grease
Huntersville, NC 28078
Pace Analytical Services, Inc
2225 Riverside Drive
828- 254 -7176
Wet chemistry and metals
Asheville, NC 28804
X Certification
1 certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure
that qualified personnel properly gather and evaluate the information submitted Based on my inquiry of the person or persons who manage the system or those persons
directly responsible for gathering the information the information submitted is to the best of my knowledge and belief, true accurate, and complete 1 am aware that
there are significant penalties for submitting false information including the possibility of fine and imprisonment for knowing violations
A Name & Official Title (Type Or Print)
B Area Code and Phone No
Terry L Taylor - General Manager II
(704) 263 -3204
C Signature
D Date Signed
sus U
EPA Form 3 �A2F (1 -92) t�/ Page 3 of 3

EPA ID Number (copy from Item 1 of Form 1) I Form Approved OMB No 2040 -0086
JC0004961 Approval expires 5 -31 -92
VII Discharge information (Continued from page 3 of Form 2F)
Part A — You must provide the results of at least one analysis for every pollutant in this table Complete one table for each outfall See instructions for additional details
Pollutant
and
CAS Number
(if available)
Maximum Values
(include units)
Average Values
(include units)
Number
of
Storm
Events
Sampled
Sources of Pollutants
Grab Sample
Taken During
First 20
Minutes
Flow- Weighted
Composite
Grab Sample
Taken During
First 20
Minutes
Flow- Weighted
Composite
Oil and Grease
N/A
outfalls SWO01, SWO02 and SWO03
Biological Oxygen
Demand(BOD5)
(see other attached Forms 2F
Chemical Oxygen
Demand (COD)
for analytical results summary)
Total Suspended
Solids (TSS)
Total Nitrogen
Total Phosphorus
pH
Minimum
I Maximum
Minimum
Maximum
Part B — List each pollutant that is limited in an effluent guideline which the facility is subject to or any pollutant listed in the facility s NPDES permit for its process
wastewater (if the facility is operating under an existing NPDES permit) Complete one table for each outfall See the instructions for additional details and
requirements
Pollutant
and
CAS Number
(if available)
Maximum Values
(include units)
Average Values
(include units)
Number
of
Storm
Events
Sampled
Sources of Pollutants
Grab Sample
Taken During
First 20
Minutes
Flow- Weighted
Composite
Grab Sample
Taken During
First 20
Minutes
Flow- Weighted
Composite
Outfalls SW001, SWO02 and SWO03
(see other attached Forms 2F
for analytical results summary)
EPA Form 3510 -2F (1 -92) Page VII -1 Continue on Reverse

Continued from the Front
Part C - List each pollutant shown in Table 2F -2, 2F -3 and 2F -4 that you know or have reason to believe is present See the instructions for additional details and
requirements Complete one table for each outfall
Pollutant
and
CAS Number
(if available)
Maximum Values
(include units)
Average Values
(include units)
Number
of
Storm
Events
Sampled
Sources of Pollutants
Grab Sample
Taken During
First 20
Minutes
Flow- Weighted
Composite
Grab Sample
Taken During
First 20
Minutes
Flow- Weighted
Composite
Outfalls SW001, SW002 and SW003
(see other attached Forms 2F
for analytical results summary)
Part D — Provide data for the storm event(s) which resulted in the maximum values for the Flow weighted composite sample
1
Date of
Storm
Event
2
Duration
of Storm Event
(in minutes)
3
Total rainfall
during storm event
(in inches)
4
Number of hours between
beginning of storm measured
and end of previous
measurable rain event
5
Maximum flow rate during
rain event
(gallons/minute or
specify units)
6
Total flow from
rain event
(gallons or specify units)
See other
attached
Forms 2F for analytical
results for SW001
SW002 and SW003
7 Provide a description of the method of flow measurement or estimate
Flow data derived from a theoretical flow calculation using local meteorological data and contributing watershed area of the
outfalls
EPA Form 3510 -2F (1 -92) Page VII -2

RIVERBEND STEAM STATION
Stormwater Discharge Permit Application
Form 2F Supplemental Information

GENERAL SITE INFORMATION
Riverbend Steam Station is a fossil- fueled, electric generation plant located in Gaston
County approximately six miles northeast of Mount Holly, North Carolina The station
property encompasses 572 acres adjacent to and on the western side of Mountain
Island Lake which is formed by the Catawba River The station is accessed from Steam
Plant Road off of Horseshoe Bend Beach Road
The station has four active coal -fired generation units with a total generating capacity of
227 megawatts, three active oil or gas -fired combustion turbine units rated at 30
megawatts each, and one out -of- service combustion turbine unit The primary station
generation yard area encompasses approximately 20 acres The facility includes a Main
Switchyard, a 44 kV Switchyard, and a 230 kV Switchyard occupying a total of
approximately 8 acres Also associated with the station is a coal storage pile covering
approximately 13 acres, a primary ash setting basin occupying approximately 41 acres,
a secondary ash settling basin occupying approximately 28 acres, and a closed dry ash
stack occupying approximately 35 acres Prior to construction of the ash settling basins,
waste ash was disposed of in a cinder pit that remains on -site and encompasses
approximately 9 acres Ash is sluiced to the primary ash settling basin The ash stack
was used as a repository for ash cleaned out of the ash settling basins The ash stack is
no longer used and has been stabilized with a vegetated soil cap
The Riverbend Steam Station also includes a approximately one acre -size scrap yard,
several construction spoil and laydown areas, a wastewater treatment facility, a coal
unloading and handling operation, a warehouse, a fuel oil storage tank, paved parking
areas, approximately two miles of rail lines, and approximately 1 mile of paved access
roadways The Lark Maintenance Garage is considered part of the Riverbend Steam
Station as well, and is located along the facility western property boundary
In developed areas, runoff generally flows overland to ditches and catch basins which
are connected to a buried network of corrugated metal pipes (CMP) In most areas west
of the Powerhouse, this collected runoff discharges into one of three oil trap tanks prior
to discharging to surface waters In most areas east of the Powerhouse, this collected
runoff discharges into the station yard sump that subsequently pumps to the ash settling
basins
The Riverbend Steam Station maintains an up -to -date Spill Prevention Control and
Countermeasure (SPCC) Plan in place in accordance with the USEPA Oil Pollution
Prevention Regulation 40 CFR Part 112

NPDES PERMITTED DISCHARGES SUMMARY
Riverbend Steam Station has three NPDES process water outfalls The NPDES
discharges are summarized as follows
NPDES Outfall 001 — Once - Through Cooling Water
This discharge is a once - through non - contact cooling water system which condenses
steam from the plant condensers This discharge occurs at the station discharge canal
NPDES Outfall 002 - Ash Settling Basins
This is the outflow from the ash settling basins The ash settling basins are the
repositories for waste ash sluiced from the plant These basins also accept wastewater
discharges from the boiler room sump, the turbine room sump, and the yard drainage
sump These discharges include stormwater runoff from the coal storage pile, effluent
from the sanitary system, once - through cooling water from the induced draft fan motors
and the preheater bearings, effluent from a groundwater remediation system, effluent
from a vehicle wash -down station, and industrial wastewater from various powerhouse
equipment
NPDES Outfall 002A — Yard Sump Overflow
Should the pumps in the Yard Sump lose power, experience a mechanical failure, or
become inundated during a large storm event, the sump would overflow through a pipe
into Mountain Island Lake (the Catawba River) Overflow from this sump is not a normal
occurrence

STORMWATER OUTFALLS AND DRAINAGE AREA DESCRIPTIONS
The Riverbend Steam Station has twelve identified active stormwater outfalls that
discharge to surface waters The outfall locations and contributing drainage area
delineations are shown on the accompanying site plan All identified stormwater outfalls
discharge into Mountain Island Lake formed by the Catawba River Five outfalls
discharge into the station intake canal upstream of the plant intake structure Two
outfalls discharge into Mountain Island Lake north of the coal storage pile The
remaining five outfalls discharge onto the ground and then flow overland eventually
reaching Mountain Island Lake There are two abandoned outfalls at the station
A description of the contributing drainage area for each outfall is provided below
Included with the description is the approximate location coordinates of the outfalls, the
amount of impervious surface area within the drainage areas, a description of any
significant materials and activities located within the drainage areas, the type of
discharge conveyances, and a description of any discharge control measures
In addition to any significant materials particular to each drainage basin, herbicides are
applied to selected areas at the Riverbend Steam Station to eliminate undesirable
vegetation Herbicides are generally used along railways, ash pipelines, and the
perimeter fence Herbicides are also applied, as needed, in the gravel parking lots,
switchyard, and laydown areas Herbicides are sprayed around the fuel oil bulk storage
tanks, yard sumps, transformers, trailers, and the intake structure All herbicides used at
Riverbend Steam Station are approved by the company and considered safe to the
environment when used according to directions Records are retained at the facility
documenting the areas treated, and the type and amount of herbicides used
Certain stormwater outfall drainage areas share similarities regarding the presence of
significant materials and /or activities Based on these similarities, stormwater
discharges from certain groups of outfalls can be represented by the discharge of a
designated representative outfall within the group
Outfall SW001 (Drainage Area 1)
Discharge Structure 24 inch diameter CMP
Location
West side of station intake canal
Coordinates
35 021'38" N 80 058'30" W
Drainage Area
4 4 acres
Impervious Area
100%
Area Description
The drainage area for SW001 includes 1 5 acres comprised of the Powerhouse roof,
approximately 2 7 acres of the Main Switchyard, and approximately 0 2 acres of paved
areas on the west side of the Powerhouse The Main Switchyard is a large paved area
containing numerous transformers and circuit breakers containing mineral oil A black
start diesel generator is located in the northern corner of the Main Switchyard, and
occasional tanker truck refueling of diesel fuel occurs adjacent to the generator
3

All stormwater runoff from Drainage Area 1 is routed into the 10,000 gallon capacity No
3 Oil Trap Tank located on the west end of the Powerhouse The Oil Trap Tank
discharges into the intake canal
Significant Materials /Activities
Mineral Oil Mineral oil is stored inside numerous oil- cooled transformers and circuit
breakers in the SWO01 drainage area portion of the Main Switchyard
The largest mineral oil containers in this area are the 6B and 7B
transformers containing 10,990 gallons each These two large
transformers are located within concrete containment pits with drain
valves that discharge into the No 3 Oil Trap Tank Stormwater runoff
from remaining areas surrounding all other electrical equipment in this
drainage area enters catch basins that discharge into the No 3 Oil Trap
Tank
Diesel Fuel The black start diesel generator has the capacity to store up to 1,200
gallons of diesel fuel within a self - contained double - walled integral tank
Occasional tanker unloading operations are conducted adjacent to the
generator to refuel the unit Stormwater runoff from this tanker unloading
area enters catch basins that discharge into the No 3 Oil Trap Tank
Discharae Controls
10,000 gallon capacity No 3 Oil Trap Tank
Outfall SWO02 (Drainage Area 2)
Discharge Structure 21 inch diameter CMP
Location West side of station intake canal
Coordinates 35 021'38" N 80 058'30" W
Drainage Area 13 2 acres
Impervious Area 35%
Area Description
The drainage area for SWO02 is comprised of station yard areas located south and west
of the Powerhouse Located within Drainage Area 2 are the remaining portions of the
Main Switchyard, the entire 44 kV Switchyard, two control buildings for the combustion
turbine units, and the fuel oil unloading station for the Main Fuel Oil Storage Tank The
two switchyards are paved and cover approximately 2 6 acres The fuel oil unloading
station encompasses 0 9 acres and is located along the southeastern drainage area
boundary This area is paved and used by tanker trucks to unload fuel oil for refilling of
the 4,250,000 gallon capacity Main Fuel Oil Storage Tank The unloading station has
ten unloading bays, however only two of the bays are operational The unloaded fuel oil
is transferred to the tank through underground piping fitted with a backflow preventer
All stormwater runoff from the unloading station discharges into the 30,000 gallon
capacity No 4 Oil Trap Tank located 150 feet northwest of the unloading station This
oil trap tank discharges into the No 2 Oil Trap Tank A service transformer associated
with the fuel oil unloading station is located within a containment pit on the north end of
the unloading station Stormwater runoff from the area surrounding this transformer
enters a ditch that discharges into the 30,000 gallon capacity No 4 Oil Trap Tank

Drainage Area 2 also includes approximately 0 5 acres of paved parking areas,
approximately 6 acres of grassed lawn and grassed embankment areas, approximately
2000 linear feet of paved access roadway, and approximately 6000 linear feet of rail
lines used for coal delivery to the station All stormwater runoff from Drainage Area 2
discharges into the 10,000 gallon capacity No 2 Oil Trap Tank located on the west end
of the Powerhouse The No 2 Oil Trap Tank discharges into the intake canal
Significant Materials /Activities
Mineral Oil Mineral oil is stored inside numerous oil- cooled transformers and circuit
breakers in the SW002 drainage area portion of the Main Switchyard and
in the 44kV Switchyard All stormwater runoff from these switchyard
areas enters catch basins that discharge into the No 2 Oil Trap Tank
482 gallons of mineral oil is stored in the fuel oil unloading area service
transformer Stormwater runoff from the area surrounding this
transformer discharges into the 30,000 gallon capacity oil trap tank that
subsequently discharges into the No 2 Oil Trap Tank
Fuel Oil Tanker trucks with individual capacities of 8,000 gallons each unload fuel
oil at the tanker unloading station Stormwater runoff from this area
discharges into the 30,000 gallon capacity oil trap tank that subsequently
discharges into the No 2 Oil Trap Tank
Coal Train cars carrying coal use the rail lines that pass through the eastern
portion of Drainage Area 2 All stormwater runoff from these rail lines
eventually discharge into the No 2 Oil Trap Tank
Discharge Controls
10,000 gallon capacity No 2 Oil Trap Tank
Outfall SW003 (Drainage Area 3)
Discharge Structure 36 inch diameter CMP
Location West side of station intake canal
Coordinates 35 021'40" N 80 058'32" W
Drainage Area 15 4 acres
Impervious Area 5%
Area Description
The drainage area for SW003 is comprised of station yard areas southwest of Drainage
Area 2 Located within Drainage Area 3 is the entire gravel- surfaced 230 kV Switchyard
containing numerous transformers and circuit breakers with a total mineral oil storage
capacity of 6,700 gallons Stormwater runoff from the switchyard enters catch basins
that discharge into a concrete ditch that subsequently directs the flow westerly to a 36
inch diameter CMP beneath the station entrance road The inlet end of this CMP is fitted
with a swing gate that can be closed in the event of a mineral oil release from any
electrical equipment in the switchyard This pipe discharges into a concrete ditch that
runs north along the east side of the Main Fuel Oil Storage Tank containment dike This
ditch terminates into a 36 inch diameter CMP that eventually discharges into the station
intake canal Approximately 900 linear feet of paved access roadway passes through
5

the drainage area and approximately 800 linear feet of rail lines cross the southeastern
region of the drainage area
Drainage Area 3 also includes approximately 10 acres of grassed lawn areas and the
vegetated external slope of the southern portion of the earthen containment dike
surrounding the Main Fuel Oil Storage Tank A small section of fuel oil piping from the
tanker unloading area to the tank is present aboveground where the piping crosses the
concrete ditch southeast of the tank containment dike
Significant Materials /Activities
Mineral Oil Mineral oil is stored inside numerous oil- cooled transformers and circuit
breakers in the 230kV Switchyard
Fuel Oil A small section of fuel oil delivery piping is present aboveground
southeast of the tank containment dike
Coal Train cars carrying coal use the rail lines that pass along the southeastern
edge of the drainage area
Discharge Controls
None
Outfall SW004 (Drainage Area 4)
Discharge Structure 15 inch diameter Reinforced Concrete Pipe
Location East side Horseshoe Bend Beach Road
Coordinates 35 021'22" N 80 058'32" W
Drainage Area 4 6 acres
Impervious Area 15%
Area Description
The drainage area for SW004 is comprised of a narrow strip of station property located
along the southeastern boundary between Horseshoe Bend Beach Road and the access
road leading to the tanker fuel oil unloading station The area is primarily comprised of a
grassed yard Approximately 200 linear feet of the paved tanker fuel oil unloading
station access road crosses through the area
Stormwater is discharged from SW004 into a ditch that subsequently flows off -site to the
south approximately 1000 feet to Mountain Island Lake
Significant Materials /Activities
None
Discharge Controls
None
11

Outfall SW005 (Drainage Area 5)
Discharge Structure 24 inch diameter CMP
Location South side of Steam Plant Road
Coordinates 35 021'21" N 80 058'37" W
Drainage Area 3 5 acres
Impervious Area 8%
Area Description
The drainage area for SW005 is located along the northeast side of Steam Plant Road in
the extreme southeastern area of the station property The drainage area is primarily
comprised of grassed yard with the western boundary of the area being formed by the
centerline of the paved Steam Plant Road
Stormwater is discharged from SW005 into a ditch that subsequently flows off -site to the
southwest
nificant Materials /Activities
None
Discharge Controls
None
Outfall SW006 (Drainage Area 6)
Discharge Structure 36 inch diameter CMP
Location West side of station intake canal
Coordinates 35 021'39" N 80 058'32" W
Drainage Area 5 2 acres
Impervious Area 35%
Area Description
The drainage area for SW006 is comprised of station yard areas west of the
Powerhouse in the vicinity of the combustion turbine units and the Main Fuel Oil Storage
Tank Located within Drainage Area 6 are the four combustion turbine units and the
instrumentation house and warehouse associated with these units Drainage Area 6
also includes the 4,259,000 gallon Main Fuel Oil Storage Tank and the northeastern
portion of the surrounding earthen containment dike for this tank Aboveground fuel oil
piping from the tank to the combustion turbine units and to the Powerhouse passes
through the SW006 drainage area A large transformer associated with the combustion
turbine units is also located in this area southeast of the units Four lube oil storage
tanks are located at the two active combustion turbine units A contaminated
groundwater remediation /recovery system is in operation within Drainage Area 6
Groundwater is recovered from several monitoring wells within the area and is
discharged into an oil /water separator The separator discharges collected petroleum
product into a 55 gallon drum, and discharges collected water into the station
wastewater treatment system

Drainage Area 6 includes approximately 3 acres of grassed lawn areas, the grassed
external slope of the earthen containment dike, and approximately 500 linear feet of
paved access roadway surrounding the combustion turbine units The Main Fuel Oil
Tank containment dike is drained of collected rainwater by a manually operated siphon
system The collected rainwater discharges into a concrete ditch at the eastern base of
the dike embankment All stormwater runoff from within Drainage Area 6, including
drainage from the containment dike, enters catch basins or ditches that discharge into
the 20,000 gallon capacity No 1 Oil Trap Tank located between the combustion turbines
units and the station intake canal The No 1 Oil Trap Tank discharges into the intake
canal
Sianificant Materials /Activities
Fuel Oil Fuel oil is stored in the 4,259,000 gallon Main Fuel Oil Storage Tank
located within an earthen containment dike Aboveground fuel oil piping
runs between the tank and the combustion turbine units, and continues
on to the Powerhouse
Mineral Oil 9,237 gallons of mineral oil is present in the combustion turbine
transformer
Lube Oil Lube oil is stored in four 750 gallon capacity turbine lube oil tanks located
at the two active turbine units
Contaminated Groundwater Petroleum contaminated groundwater is recovered from
several monitoring wells within the area
Discharge Controls
20,000 gallon capacity No 1 Oil Trap Tank
Outfall SW007 (Drainage Area 7)
Discharge Structure 24 inch diameter steel pipe
Location Mountain Island Lake
Coordinates 35 021'80" N 80 058'28" W
Drainage Area 0 9 acres
Impervious Area 0%
Area Description
The drainage area for SW007 is comprised of a small portion of a grassed embankment
on the northern side of the coal storage pile and a small section of gravel- surfaced
roadway and laydown yard located between the coal storage pile and Mountain Island
Lake
Significant Materials /Activities
Inert Materials Various quantities of structural steel, cable, truck trailers, and
other inert materials may be stored on the gravel laydown yard
area at various times

Discharge Controls
None
Outfall SW008 (Drainage Area 8)
Discharge Structure 36 inch diameter CMP
Location Mountain Island Lake
Coordinates 35 021'51" N 80 058'16" W
Drainage Area 70 acres
Impervious Area 2%
Area Description
Drainage Area 8 is located in the central area of the station property and includes the
closed dry ash stack occupying approximately 35 acres, the cinder pit encompassing
approximately 9 acres, and a scrap yard adjacent to the cinder pit Drainage Area 8
extends into undeveloped woodland areas on the south side of Horseshoe Bend Beach
Road Located within the drainage area is approximately 7 acres of woodlands,
approximately 1,600 linear feet of ash sluice piping, approximately 6,150 linear feet of
rail lines, approximately 2,425 linear feet of gravel- surfaced roadways, and
approximately 3,500 linear feet of the paved Horseshoe Bend Beach Road Two service
transformers for the yard sump pumps are located within the drainage area at the north
end of the coal storage pile These transformers are surrounded by a containment dike
with a chemical polymer oil containment barrier
Stormwater runoff from the ash stack and all areas south of the rail lines within Drainage
Area 8 enters a stormwater collection basin located west of the ash stack This basin
discharges into the cinder pit through a pie beneath the rail lines All stormwater runoff
from within Drainage Area 8 eventually enters the cinder pit which functions as a large
dry detention pond The pit is fitted with a 3 feet high CMP riser pipe leading to the 36
inch diameter CMP discharge outlet pipe Stormwater entering the cinder pit typically
evaporates and /or infiltrates before reaching a level high enough to discharge into the
riser pipe Discharges from the 36 inch diameter CMP rarely occur
Significant Materials /Activities
Mineral Oil Mineral oil is present in the two yard sump pump service transformers
located within a containment berm
Coal Train cars carrying coal use the rail lines that pass through the drainage
area
Ash Waste ash is transported through ash sluice piping that runs through the
drainage area
Inert Materials Various quantities of inert materials may be stored on the scrap
yard
Discharge Controls
Cinder pit dry detention pond

Outfall SW009 (Abandoned).
Outfall SW010 (Drainage Area 10)
Discharge Structure 18 inch diameter CMP
Location North of Lark Maintenance Facility
Coordinates 35 021'38" N 80 °58'41" W
Drainage Area 0 6 acres
Impervious Area 50%
Area Description
The drainage area for SW010 is comprised of the southeastern portion of the Lark
Maintenance Facility roof, portions of a paved driveway and storage area on the east
side of the facility, and vegetated areas east of the driveway Stormwater from Drainage
Area 10 is discharged into a woodlands area north of the facility that subsequently flows
overland approximately 800 feet to Mountain Island Lake
Significant Materials /Activities
Inert Materials Various quantities of inert materials may be stored on the paved
storage area on the east side of the facility
Discharge Controls
None
Outfall SW011 (Drainage Area 11)
Discharge Structure 18 inch diameter CMP
Location West of Lark Maintenance Facility
Coordinates 35 021'33" N 80 058'45" W
Drainage Area 1 1 acres
Impervious Area 70%
Area Description
The drainage area for SW011 is comprised of the southwestern portion of the Lark
Maintenance Facility roof, portions of a paved driveway and parking lot on the west side
of the facility, and a small vegetated areas on the west side of the building Stormwater
from Drainage Area 11 is discharged into a woodlands area west of the facility that
subsequently flows overland approximately 800 feet to Mountain Island Lake
Significant Materials /Activities
None
Discharge Controls
None
10

Outfall SW012 (Drainage Area 12)
Discharge Structure 8 inch diameter polyethylene pipe
Location
North of Lark Maintenance Facility
Coordinates
35 021'37" N 80 058'42" W
Drainage Area
0 1 acres
Impervious Area
100%
Area Description
The drainage area for SW012 is comprised wholly of roof drainage from the northeastern
portion of the Lark Maintenance Facility roof Stormwater from Drainage Area 12 is
discharged into a woodlands area south of the facility that subsequently flows overland
approximately 800 feet to Mountain Island Lake
Significant Materials /Activities
None
Discharge Controls
None
Outfall SW013 (Abandoned)
Outfall SW014 (Drainage Area 14)
Discharge Structure 12 inch diameter CMP
Location East side of station intake canal
Coordinates 35 021'42" N 80 058'30" W
Drainage Area 0 02 acres
Impervious Area 0%
Area Description
The drainage area for SW014 is comprised wholly of a grassed bermed area
surrounding the station septic tank Stormwater runoff from within this small bermed
area enters a catch basin that discharges into the intake canal from the steep eastern
side of the canal embankment Access to the discharge end of this pipe is difficult due
to thick vegetation and the steepness of the bank
Significant Materials /Activities
None
Discharge Controls
None
11

REMAINING DRAINAGE AREA DESCRIPTIONS
The Riverbend Steam Station has additional non -point source stormwater runoff areas
that discharge into Mountain Island Lake, and non - stormwater discharge drainage areas
that discharge into the station yard sump that pumps to the ash settling basins
Non -point source stormwater runoff areas are described as follows
Non -Point Runoff - Immediately West of Station Intake Canal
This area comprises approximately 1 5 acres and is located along the western side of
the intake canal east of Drainage Area 6 and north of Drainage Area 2 The area
contains a mobile office trailer and approximately 1 acre of asphalt pavement
Aboveground fuel oil piping from the Main Fuel Oil Storage Tank to the Powerhouse
passes through this area Approximately 65% of this drainage area is impervious
Stormwater runoff flows overland down the nprap slope of the western intake canal
embankment
Non -Point Runoff - Immediately East of Station Intake Canal
This area comprises approximately 1 acre and is located along the eastern side of the
intake canal from the Powerhouse to the septic tank system The area contains the
27,000 gallon capacity Light -off Fuel Oil Storage Tank and the 25,000 gallon capacity
Used PCB Mineral Oil Storage Tank Both of these tanks area are located within
covered concrete containment basins with closed and locked drain valves Aboveground
fuel oil piping from the Main Fuel Oil Storage Tank to the Light -off Fuel Oil Storage Tank
passes through this area The area also contains a gravel - surfaced roadway and a
small storage shed The septic tanks area located within an earthen - bermed area that
drains through Outfall SW014 Approximately 15% of this drainage area is impervious
Stormwater runoff flows overland down the vegetated slope of the eastern intake canal
embankment
Non -Point Runoff - North End of Lark Maintenance Facility
This area covers approximately 1 5 acres and is comprised of most of the northern
portions of the facility roof and asphalt -paved roadways and parking areas surrounding
the northern half of the building Approximately 30 drums of various petroleum products,
coolants, and solvents are stored inside a covered shed on the east side of the building
Inert materials are stored outside on pavement on the east side of the building
Approximately 75% of this drainage area is impervious Stormwater runoff flows across
asphalt pavement into the wooded area to the north
Non -Point Runoff — Areas Surrounding the Ash Settling Basins
This large area extends from the intake canal across the area north of the cinder pit, and
continues around the perimeter of the two ash settling basins The area is primarily
woodlands and includes the grassed exterior slopes of the ash settling basin
embankments and dirt or gravel - surfaced access roads around the ash basins A small
gravel- surfaced laydown yard containing inert materials is located within this area north
of the coal storage pile There are no significant materials or activities located within this
area, and none of the drainage area is impervious
12

The Riverbend Steam Station has one yard sump that receives wastewater discharges
from various internal and external areas of the station and subsequently pumps this
wastewater to the ash basins The sump pumps to the ash basins through a 30 inch
diameter ductile iron pipe Rarely occurring emergency sump overflows will discharge
through a 24 inch diameter CMP to Mountain Island Lake This outfall is permitted as
NPDES Outfall 002A — Yard Sump Overflow
This sump accepts wastewater discharges from the boiler room sump and the turbine
room sump inside the Powerhouse These discharges include effluent from the sanitary
system, once - through cooling water from the induced draft fan motors and the preheater
bearings, effluent from a groundwater remediation system, effluent from a vehicle wash -
down station, effluent from floor drains, and industrial wastewater from various
powerhouse equipment
This yard sump also accepts stormwater runoff from several areas around the
Powerhouse This runoff generally flows into catch basins that discharge via subsurface
piping into the sump Located within the yard sump stormwater drainage area are the
following
• The approximately 13 acre coal storage pile,
• Approximately 1 3 acres of Powerhouse roof area,
• All coal handling buildings, maintenance sheds, conveyors and equipment,
• Warehouses and storage shed roofs,
• Asphalt and gravel - surfaced roadways and parking areas,
• Rail lines
Included within this drainage area are numerous transformers containing mineral oil,
numerous 55 gallons drums containing new and used oils, a 1,000 gallon capacity
gasoline underground storage tank, a 750 gallon capacity sulfuric acid tank, and a
hazardous waste accumulation area Refueling and tanker truck loading and unloading
operations are conducted within the area for the coal handling bulldozers and tractors, at
the gasoline underground storage tank, at the Light -off Fuel Oil Storage Tank, and at the
Used PCB Mineral Oil Storage Tank Various oils, chemicals, paints and solvents are
unloaded from trucks within the drainage area
13

FOR AGENCY USE ON[ Y
Date Rtxerved
Division of Water Quality /Surface Water Protection Year Month Day
NCDENRNational Pollutant Discharge Elimination System
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT ANO NATURAL RESOURCES REPRESENTATIVE OUTFALL STATUS (ROS)
REQUEST FORM
If a facility is required to sample multiple discharge locations with very similar stormwater discharges, the
permittee may petition the Director for Representative Outfall Status (ROS). DWQ may grant Representative
Outfall Status if stormwater discharges from a single outfall are representative of discharges from multiple
outfalls. Approved ROS will reduce the number of outfalls where analytical sampling requirements apply.
If Representative Outfall Status is granted, ALL outfalls are still subject to the qualitative monitoring
requirements of the facility's permit— unless otherwise allowed by the permit (such as NCG020000) and DWQ
approval. The approval letter from DWQ must be kept on site with the facility's Stormwater Pollution
Prevention Plan. The facility must notify DWQ in writing if any changes affect representative status.
For questions, please contact the DWQ Regional Office for your area (see page 3).
(Please print or type)
1) Enter the permit number to which this ROS request applies:
Individual Permit (or) Certificate of Coverage
N I C .5_ ,N, 1 C" fG
2) Facility Information:
Owner /Facility Name Duke Energy Carolinas, LLC
Riverbend Steam Station 175 Steam Plant Road, Mount Holly, NC 28120
Facility Contact
Street Address
City
E -mail Address
Telephone No
Mark McGary
PO Box 1006 Mail Code EC13K_
Charlotte
Mark McGary@duke- energy com
980 - 373 -7898
State NC
Fax
ZIP Code 28201
3) List the representative outfall(s) information (attach additional sheets if necessary):
Outfall(s) SWO04 is representative of Outfalls SW004, SW005, SW007, SW010, SW011, SWO12 & SWO14
Outfalls' drainage areas have the same or similar activities? Yes ❑ No
Outfalls' drainage areas contain the same or similar materials? & Yes ❑ No
Outfalls have similar monitoring results? ❑ Yes ❑ No VNo data*
Outfall(s) SWO02 is representative of Outfalls SW001, SW002, SW003, SWO06 and SWO08
Outfalls' drainage areas have the same or similar activities? N (Yes ❑ No
Outfalls' drainage areas contain the same or similar materials? fifes ❑ No
Outfalls have similar monitoring results? ❑ Yes ❑ No Act data*
*Non - compliance with analytical monitoring prior to this request may prevent ROS approval. Specific
circumstances will be considered by the Regional Office responsible for review.
4) Detailed explanation about why the outfalls above should be granted Representative Status:
(Or, attach a letter or narrative to discuss this information ) For example, describe how activities and /or
materials are similar.
See attached representative outfalls summary table
Page 1 of 3
SWU -ROS -2009 Last revised 12/30/2009

Representative Outfall Status Request
5) Certification:
North Carolina General Statute 143 -215.6 B(i) provides that:
Any person who knowingly makes any false statement, representation, or certification in any application, record,
report, plan, or other document filed or required to be maintained under this Article or a rule implementing this
Article, or who knowingly makes a false statement of a material fact in a rulemaking proceeding or contested case
under this Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or monitoring device
or method required to be operated or maintained under this Article or rules of the [Environmental Management]
Commission implementing this Article shall be guilty of a Class 2 misdemeanor which may include a fine not to exceed
ten thousand dollars ($10,000)
I hereby request Representative Outfall Status for my NPDES Permit I understand that ALL outfalls are still
subject to the qualitative monitoring requirements of the permit, unless otherwise allowed by the permit
and regional office approval I must notify DWQ in writing if any changes to the facility or its operations take
place after ROS is granted that may affect this status If ROS no longer applies, I understand I must resume
monitoring of all outfalls as specified in my NPDES permit
I certify that I am familiar with the information contained in this application and that to the best of my
knowledge and belief such information is true, complete, and accurate
Printed Name of Person Signing Terry L Taylor Y!'Y `. �/ a Zr
Title General Manager II
(Signature Applicant) (Date Signed)
Please note: This application for Representative Outfall Status is subject to approval by the
NCDENR Regional Office. The Regional Office may inspect your facility for compliance with the
conditions of the permit prior to that approval.
Final Checklist for ROS Request
This application should include the following items:
❑ This completed form
❑ Letter or narrative elaborating on the reasons why specified outfalls should be granted representative
status, unless all information can be included in Question 4
• Two (2) copies of a site map of the facility with the location of all outfalls clearly marked, including the
drainage areas, industrial activities, and raw materials /finished products within each drainage area
• Summary of results from monitoring conducted at the outfalls listed in Question 3
• Any other supporting documentation
Mail the entire package to:
NC DENR Division of Water Quality
Surface Water Protection Section
at the appropriate Regional Office (See map and addresses below)
Page 2 of 3
SWU -ROS -2009 Last revised 12/30/2009

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