Marshall Steam Station (2)

7 Duke
' Energy,
June 14, 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 - Addendum
Marshall Steam Station
Dear Mr. Bennett:
CORPORATE EHS SERVICES
Duke Energy
526 South Church St.
Charlotte, NC 28202
Mailing Address:
EC13K / PO Box 1006
Charlotte, NC 28201-1006
� 1!ROY
illi
J!!N 2011
DENR - W�17E� �V�
WeUanda d &water Rr.
Duke Energy is amending a portion of the Marshall Steam Station NPDES Stormwater Permit
Application originally submitted via letter dated March 29, 2011. Attached please find the
following amended documents:
a. EPA Form 2F Supplemental Information;
b. DWQ ROS Request Form;
C. ROS Form Supplemental Information;
d. Site Stormwater Plan Drawing
In summary, this amendment is being made to add new stormwater outfall SW023, and to
change the representative outfall selection of SWO04 to SW003. These changes are described
in detail in the attached EPA Form 2F Supplemental Information and the ROS Form
Supplemental Information documents.
Please contact me at [e-mail] or at 704-634-7098 if you have any
questions or need any additional information.
Sincerely,
Mark McGary, P.E.
Environmental, Health & Sa ety
attachments
wwW duke-energy.com

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

GENERAL SITE INFORMATION
Marshall Steam Station is a fossil -fueled, electric generation plant located approximately one
mile east of the community of Terrell in Catawba County, North Carolina The facility has
four production units with a generating capacity of 2,090 megawatts, a Flue Gas
Desulfurization (FGD) system, a Selective Catalytic Reduction (SCR) system, a wetlands
wastewater treatment plant, a limestone unloading and stacker system, a gypsum stacker, a
FGD landfill, and various storage and maintenance buildings
The Marshall Steam Station property is comprised of 2,043 contiguous acres The property
includes ,a 28 acre plant yard, a 6 acre electrical switchyard, a 36 acre coal storage yard, and
a 450 acre.ash settling basin The ash settling basin is located in the headwaters of
Holdsclaw Creek and has a regulated outflow to Lake Norman The Marshall Steam Station
property also'includes as
80 acres occupied by a ash structural fill, an
approximately 58 acre closed ash landfill, an,ash handling silo operation, a bottom ash
operation, an FGD residue landfill, a FGD gypsum stacker operation, a FGD limestone
stacker operation, a FGD constructed wastewater treatment wetlands, a sanitary wastewater,
treatment lagoon, several construction spoil areas, approximately 6 miles of rail access, and
approximately 3 miles of paved roadways
In developed areas, runoff is collected by catch basins and conveyed through a buried
network of corrugated metal pipes (CMP) The network was originally designed to route flow
to several primary trunk lines, which discharged directly to Lake Norman In 1'976 runoff from
most areas with significant materials and activities was re-routed into a yard sump system
Stormwater entering the yard sump system is pumped to the ash settling basin
Stormwater runoff from the FGD facility area enters yard drains and is then routed via gravity
flow through subsurface piping to a detention pond This pond discharges to a transfer sump
that pumps to the yard sump system/ash settling basin system Stormwater runoff from the
FGD limestone stacker operation is routed into'a separate detention pond that discharges
into the yard sump system/ash settling basin system Stormwater runoff from the ash
handling silo operation is also routed to the ash settling basin via the sump system
All stormwaterrunoff from the coal storage yard, the FGD residue landfill, the ash structural
fill, the closed ash landfill, the FGD gypsum stacker,operation, the FGD constructed
wastewater treatment wetlands„ and the bottom ash operation drains via, gravity flow into the
ash settling basin
The Marshall 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
Marshall Steam Station has six 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 condensers and other selected heat exchangers This discharge
occurs at the station discharge canal
NPDES Outfall #002 -.Ash Settling Basin Discharge
This is the outflow from the ash settling basin 'Plant wastewater including ash sluicing,
treated sewage, equipment discharge, and chemical waste is routed to the ash settling
basin All ,stormwater runoff from the coal storage yard, the FGD residue landfill, the
ash structural fill, the closed ash landfill, the FGD gypsum stacker operation, the FGD
constructed wastewater treatment wetlands; and the bottom ash operation drains via
gravity flow into the ash settling basin All stormwater runoff from the FGD facility area
is routed through the yard, sump system to the ash settling basin Stormwater runoff
from the FGD limestone stacker, operation is routed through the yard sump system to
the ash settling basin Stormwater runoff from the ash handling silo operation is also
routed ,to the ash settling basin via the sump system
NPDES Outfall #002A — Yard Sump #1 Overflow
Should the pumps in Yard Sump #1 lose power, experience a mechanical failure, or
become, inundated during a large,storm event, the sump would overflow to Lake
Norman through stormwater outfall SW007 Overflow from the, yard sump is not a
normal occurrence
NPDES Outfall #0`026 — Yard .Sump #2, Overflow
Should the pumps in Yard Sump #2 llose power, experience a mechanical failure, or
become inundated during a large storm event, the sump,would overflow directly to
Lake'Nbrman 'Overflow,from the yard sump is nota normal occurrence
NPDES Outfall #003 — Non -contact Cooling Water from the Induced Draft Fan Control House
This, is air conditioning condensate from the .heat exchanger for the Unit 4 ID Fans
electronics This discharge co -mingles with stormwater outfall SW009 The
condensate discharge essentially occurs continuously through SW009
NPDES Internal Outfall #004 — Treated_ FGD Wet Scrubber'1Nastewater to the Ash Settling
Basin

STORMWATER OUTFALLS AND DRAINAGE AREA, DESCRIPTIONS
The Marshall Steam Station has eleven identified 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 Lake
Norman
A description of the contributing drainage area for each outfall, is'provided below Included
with the description is the amount of impervious surface area within the drainage are, any
significant materials activities within the drainage area, and the.type of conveyance including
any discharge control measures.
In addition to any significant materials particular to each drainage basin, herbicides are
applied to selected areas at the Marshall Steam Station to eliminate,,undesirable vegetation
Herbicides are generally used along railways, ash pipelines, andthe penmeterfence ,
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 Marshall 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 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
Outfalls SWO01 through SWO04 (Drainage Areas 1 through 4)
Discharge Structure Outfall SWO01 24 inch diameter CMP
Discharge Location Intake,Cove
Coordinates 350'36' 23"' N 800 57'33" W'
Discharge Structure Outfall SW002. 24 inch diameter CMP
Discharge Location Intake Cove
Coordinates 350 36' 21" N 800 57'35" W
Discharge Structure Outfall SWO03 Ditch
Discharge Location Intake Cove
Coordinates 350 36' 11" N 800 57" 67" W
Discharge Structure Outfall SWO04 36 inch diameter HDPE Pipe
`Discharge Location Intake' Cove
Coordinates 350 36' 01" N 800 57'48" W
Drainage Area 22 acres
Impervious Area. 1 %
Area, Description
These four outfalls (with the exception of SW003) are essentially culverts beneath a gravel
road,and gravel storage yard area northeast of the Powerhouse The combined drainage
area for these outfalls includes the vegetated slopes of the ash settling basin dike and the
adjacent gravel road and gravel storage yard The embankment of the ash basin dike is
sloped at a ratio of two horizontal to one vertical (21-1 1V) and covers approximately 30
percent of the drainage area The gravel road is 0 6 miles long

These four outfalls do not discharge directly into surface waters, but discharge into a
Vegetated strip between .the gravel road and the intake canal Stormwater is then conveyed
to the lake via overland flow or ditch The distance the discharge, travels to reach the intake
canal varies for each outfall The discharge from Outfall SW001 flows overland through a
forested area approximately 100 yards before reaching the intake canal The, discharge from
Outfalls SW002 and 8W004 flows down a rip rapped embankment approximately 10 yards
before reaching the intake canal SW003 is a riprap lined ditch that extends from the, eastern
edge of the gravel road to the intake canal Including the additional area east of the road, the
total drainage area is 22 acres (8 9 acres of which is conveyed by the culverts)
The gravel laydown area contains various quantities of structural steel, cable, truck trailers,
and other inert materials at various times Stormwater runoff from most of this area
discharges through SW002,and SW003 Ash haul trucks use�the gravel road The ash haul
trucks are washed down in the ash silo area to remove excess ash and prevent, the
scattering of ash on site roads The ash handling silo, ash truck washing pad; and'two'small
pad -mounted service'transformers containing mineral oil are within the combined drainage
area for these outfalls Stormwater runoff from the ash handling silo, the ash truck washing
pad„and the gravel haul road between the silo and the Powerhouse is collected in a, sump
and subsequently pumped to Sump #2 and then to the ash settling basin The larger”
capacity transformer is located on a curbed concrete containment pad There is no,
containment for,the smaller transformer. These small service transformers represent an
insignificant risk of a mineral oil release reaching surface waters
Significant Materials
Ash Flyash is transported in ash haul trucks that use the gravel road.
Inert Materials Various quantities of structural steel, cable, truck trailers, and other inert
materials are stored on, the gravel storage area at various times
Oil. Two small pad -mounted service transformers are. located near the ash handling silo
The largest transformer contains 320 gallons of mineral oil and is located within a
concrete containment pad The small transformer contains 250 gallons of mineral oil
and has no containment
Discharge Controls
None
Outfall SW,005 (Abandoned)
Outfall' SW006 (Drainage Area 6)
Discharge Structure. 18 inch diameter CMP
Location Intake Canal
Coordinates 350 35' 57" N 800 57'51"' W
Drainage Area 2.6 acres
Impervious Area 40%
Area Description
The drainage area for SW006 includes a portion of the Powerhouse yard, approximately
9,000 square feet of the roof of the warehouse, 3,300 square feet of storage shed roof, and

12,500 square feet of an open concrete storage pad This drainage area also includes
approximately,0 5 acres,of vegetated embankment slopes Ash piping and fuel, oil piping are,
located within the drainage area for SWO06
Significant Materials
Oil One 2 inch diameter above -grade oil pipeline passes through this drainage area and
carries fuel oil from the 500,000,gallon bulk storage tank to the tractor shed located
adjacent to the coal pile
Ash Ash sluice piping passes through the SWO06 drainage area and carries ash from the
Powerhouse to the ash silos Stormwater and ash truck wash water from the ash silo
operation flows through the SWO06 drainage area to Sump #2
Discharge Controls
None
Outfall SWO07 (Drainage Area 7)
Discharge Structure 60 inch diameter CMP
Location Intake Canal
Coordinates 350 35' 56" N 800 5T 51" W
Drainage Area 39 acres
Impervious, Area 51%
Area Describbon
The drainage area for SWO07 comprises areas immediately north and extending west of the
Powerhouse The drainage area includes the roofs of the office annex, service building,
coved coal conveyors, and the remaining portion of the warehouse The drainage area also
includes paved Powerhouse yard areas, a 2 acre paved parking lot, 4 miles of rail line, and a
3 acre graveled switchyard Roofed areas comprise approximately 35,000 square feet
Vegetated embankments and outlying vegetated areas west of the Powerhouse comprise
most of the SWO07 drainage area
Located within the 8WO07 drainage area is approximately 50 drums of lube oil, and small
containers of hydrazine; glycerin and 2 -propanol, stored inside the warehouse
Approximately 1,400 feet of the covered FGD limestone and gypsum conveyors crosses
through the SWO07 drainage area
Drainage Area SW007'includes small transformers containing mineral oil'located in the 3
acre graveled switchyard The limestone radial stacker operation is also located within the
drainage basin of SWO07, however stormwater runoff from this internal area is collected
within a detention pond that discharges into Sump #1 and is subsequently pumped to the ash
basin:
On rare occasions, the stormwater discharge from SWO07 is comingled with''the NPDES
permitted overflow from Sump #1 (NPDES Outfall 002A)
Significant Materials
Oil Transformers containing a total of 340 gallons of mineral oil are located in the
switchyard Approximately 50 drums of lube oil are stored inside the Warehouse

Drum deliVeries are made at the Warehouse These drums are not routinely exposed
to stormwater
Gypsum and Limestone Approximately 1„400, feet of the covered FGD limestone and
gypsum conveyors cross through the SWO07 drainage area.
Coal The -covered coal conveyors cross through the SWO07 drainage area
Chemicals Small containers of hydrazine, glycerin and 2 -propanol are stored inside the
Warehouse These containers are not routinely exposed to stormwater,
Discharge Controls
None
Outfall SW008 (Drainage Area 8)
Discharge Structure 8 inch diameter CMP
Location Intake Canal
Coordinates 350 35' 53” N 800 57'50" W
Drainage Area 0 1 acres
Impervious Area 70%
Area Description
The SWO08 drainage area is comprised primarily of paved roadway on the east side of the
Powerhouse Approximately 70 percent of this area is paved with a small vegetated area
located immediately adjacent to the intake canal'
Significant Materials
None
Discharge Controls
None
Outfall SWO09 (Drainage Area 9)
Discharge Structure
36'inch�diameter CMP
Location
Intake Canal
Coordinates
350 35' 51" N 800 57'48" W
Drainage Area
37 acres
Impervious Area
5.0%
Area, Description
The drainage, area is comprised of portions of the Powerhouse roof, Units 3 and 4
precipitators, FGD system duct work, ,Induced Draft (ID) Fan Control House, paved yard
areas, and vegetated embankment slopes located on� the south and east side of the
Powerhouse Total roofed area is approximately 68,000 square feet, Paved plant yard
areas cover approximately 2.2 acres and contain 600 feet of rail line and 600 feet of paved
roadway Vegetated embankments slope down to the plant yard in the south and east region
of the drainage area

Office trailers, equipment, and materials are stored temporarily within the SWO09 drainage
area during, plant outages Four transformers associated with operation of°the ID fan are
located in this drainage area These, transformers are within secondary containment pits with
open drains that discharge into Sump #2 128 small transformers containing mineral oil are
`located on the Units 3 and 4 precipitator roof The largest of these, transformers contains 105
gallons of mineral oil, with the total quantity being 13,152 gallons
The 8WO09 drainage area also contains the transfer sump that receives stormwater runoff
from the FGD facility and subsequently discharges into Sump #2 The transfer sump has
engineered controls in place to mmirriizethe likelihood of an overflow event An overflow
would result in the sump contents being discharged through SWO09, however, no overflows
have occurred from the transfer sump since installation
SWO09 is also the discharge for NPDES Outfall 003 (ID fan non -contact cooling water) The
Induced D7aft (ID)Fan Control House houses electroriic equipment that controls the Unit 4
variable speed ID fans The electronics must be air conditioned, and the non -contact
condensate water from the air conditioner's heat exchanger is discharged through SWO09
This discharge essentially runs continuously
Significant Materials / Controls
Oil The Units 3 and 4 precipitators have 128 small transformers on the, roof containing -
mineral oil The largest transformer contains 105 gallons of mineral oil, with the total
quantity being 13,152 gallons
Inert Materials Office trailers, equipment, and materials are stored temporarily within the
SWO09 drainage area during plant outages,
Discharae Controls
None
Outfall SWO10 (Abandoned)
Outfall SW011 (Drainage Area 11)
Discharge Structure- 24 inch diamet'er,CMP
Location - Discharge Canal
Coordinates 350 35' 43" N_ 80,0 57'52" W
Drainage Area. 0.6 acres
Impervious Area. 1 %
Area Description
The small SVV011 drainage area is comprised of a vegetated plant yard area on'the west
side of the plant entrance road. The drainage area contains the plant raw water storage tank
and a small propane -fired generator Approximately 160 feet,of the,covered FGD limestone
and gypsum conveyors crosses through the drainage area
Significant Materials
Gypsum and Limestone Approximately 160 linear feet of the covered FGD limestone and
gypsum conveyors cross through the SW011 drainage area
-1-

Sand blasting°and Painting Maintenance activities such as painting may, be performed 'on
the tank , During these very rare occurrences, 'the stormwater
inlet would be temporarily blocked and the area surrounding
the tank would be covered
Discharge Controls
None
Outfall SW012 (Drainage Area 12)
Discharge Structure 18 inch diameter HDPE
Location Intake, Canal
Coordinates. 350 35' 50" N 800 57? 47" W
Drainage Area- 1 5 acres,
Impervious Area. 10%
Area Description
The SW012 drainage area is comprised of graveled yard areas and vegetated slopes located
north and west of the FGD facility (east of the Powerhouse)- The FGD facility ductwork
crosses over the southern end of the drainage,area
Significant Materials
Inert Materials Inert equipment and materials may occasionally be stored on the gravel
yard within the SWb12 drainage area during FGD facility outages
Discharge Controls
None
Outfall SW022 (Drainage Area 22)
Discharge Structure 18 inch diameter CMP
Location Discharge Canal
Coordinates 350 35'44" N 800 57'52"'W
Drainage Area 1, 8, acres
Impervious Area 40 0/6
Area Description
The-SW022 drainage area is comprised of a portion of the paved FGD facility access road,
paved road ditch, and, vegetated embankment slopes
Significant Materials
None
Discharge Controls
None

Outfall SW023 (Drainage Area 23)
Discharge'Structure 18 inch diameter HDPE
Location FGD embankment slope
Coordinates 350 35' 50"N 800 57'47" W
Drainage Area 1 acre
Impervious Area 0%
Area Description
The SW023 drainage area is comprised entirely of a graveled yard located north of the FGD
facility During construction of the FGD facility, Outfall SW023 was installed as a slope drain
that discharged into a sediment basin at the'base of the FGD embankment slope SW023
now discharges into a riprap lined basin that subsequently discharges into a shallow swale
that flows northeasterly and eventually into the station intake canal SW023 does not
discharge directly to surface waters
Significant Materials
Inert Materials Inert equipment,and materials may occasionally be stored on, the gravel
yard during FGD facility outages
Discharge Controls
Riprap lined basin

'REMAINING DRAINAGE AREA DESCRIPTIONS
The Marshall Steam Station has several non-stormwater discharge drainage areas that
gravity drain into the ash settling basin, or discharge into station sumps that subsequently
pump to the ash settling basin All of the areas north of the primary coal delivery rail lines will
gravity drain to the ash settling basin All drainage areas that discharge, into station sumps
are located south of these rail lines
There are three station yard sumps described as follows
Yard Sump #1
Yard Sump #1 is located north of the Powerhouse and immediately west of the coal transfer
house Sump #1 collects ,runoff from approximately 36 acres comprised,of three separate
drainage areas (designated 1A, 1B and 1C described below) 'Sump'#1 also collects
effluents from the turbine room sumps located inside the Powerhouse These turbine room
sumps essentially collect effluents from various areas and equipment located in the western
half,of the Powerhouse Sump 41 pumps directly to the ash settling basin,Rarely occurring
emergency overflows for Sump #1 are discharged through stormwater outfall SW007 as
NPDES Outfall 002A
Yard Sump #2
Yard Sump #2 is located immediately east of the service'building Sump #2, collects runoff
from 39 2 acres comprised of two separate drainage areas (designated 2A and 2B described
below) Sump #2 also collects effluents from the boiler room sumps located inside the
Powerhouse- Th, ese'boiler room sumps essentially collect effluents from various areas and
equipment located in the eastern half of the Powerhouse Cooling water for all, ID fan
bearings is processed through Sump #2 Sump #2 pumps directly to the ash settling basin
Rarely occurring emergency overflows for Sump #2 are discharged as NPDES Outfall 002B
Transfer Sump
The Transfer Sump is located southeast of'the Powerhouse. Stormwater from drainage area -
2B is collected in a detention pond that discharges into the Transfer Sump The Transfer
Sump pumps to Sump #2
Yard Sump Drainage Areas
The following drainage areas discharge into the station sumps
Drainage Area 1A (discharges to Sump #1):
Drainage Area 1A encompasses 14 3 acres comprised of Powerhouse yard areas
immediately west and southwest of the Powerhouse Located within this drainage area are
the Units 1 through 4 main step-up transformers, the FGD T1 and T2 transformers, and five
other large transformers. All these large transformers contain mineral oil and are located
Within curbed contairirrients with open drams to Sump #1; Also located with this drainage
area are the two 500,000 gallon fuel oil storage tanks (only one of which is in service), three
46',000 gallon urea storage tanks, and the tanker fuel oil unloading area for filling of the
500,000 fuel oil tank in operation . The five tanks are located within an earthen containment
dike'that'is drained via a siphon' system, that discharges'into Sump 411 The tanker unloading
area is paved and curbed to contain any fuel oil release, and has open drains that discharge
into Sump #1 Drainage Area 1A also includes a diesel fuel -powered air compressor within a
closed concrete containment basin, an emergency diesel generator with integral
containment, approximately 560 linear feet of the covered FGD limestone and gypsum

conveyors, vegetated areas, vegetated slopes, approximately 0 5 miles of the paved plant
entrance road, and approximately 0 5 miles of rail lines Approximately 12 percent of
Drainage Area 1A is impervious
Drainage Area 1B (discharges, to Sump #1):
Drainage Area 1 B encompasses 5 acres comprised of yard areas north of the Powerhouse
This drainage area includes the coal handling facilities, chemical storage, compressible gas
storage; and the roofs of the coal handling facilities, storage sheds, and the coal -handling
tractor shed The 1 B drainage area also includes a 1,000 gallon gasoline tank with integral
containment and associated tanker unloading activities, four small transformers containing
mineral oil, a tractor and bulldozer refueling station beside the tractor shed, various
petroleum tanks within containments inside, the tractor shed, and various small petroleum
container=s in the coal handling area Approximately 35 percent of, the. drainage area is
impervious. The drainage area also includes vegetated embankment slopes', approximately
0 5 miles of railways, ,and approximately 0 25 miles of paved roadways.
Drainage Area 1C (discharges to Sump #1):
Drainage Area 1 C is located west of the Powerhouse and encompasses 15 8 acres that
includes the FGD limestone stacker operation All stormwater runoff is collected within a
stormwater detention basin located at the east end of, the drainage area The basin
discharges into Sump #1
Drainage Area 2A (discharges to Sump #2):
Drainage Area 2A encompasses 8 acres and includes most of the Powerhouse roof and yard
areas between the Powerhouse and the intake canal Approximately 90% of the drainage
area is impervious The drainage area includes the Units 1 and 2 precipitators, Unit 3 SCR,
and the induced draft (ID) fans- The drainage area also includes numerous small
transformers containing mineral oil located on top of the precipitators, four ID fan
transformers within containments with open drains to Sump #2, the Sump #2 control
transformer;, a 900 gallon used oil tank and associated tanker unloading, and a 5,000 gallon
sulfuric acid tank within valved containment The 2A drainage area also includes ash sluice
piping located within concrete trenches fitted with open drains to Sump #2
Drainage Area 2B (discharges to Sump #2):
Drainage Area 213 encompasses approximately 30 acres of the FGD facility located east of
the Powerhouse and east of,the intake canal The drainage area includes the FGD facility,
the FGD'WastewaterTreatment Plant, and all surrounding paved access areas The
dramage�area includes several transformers containing mineral oil located within valved
contairiment,basins,-a small diesekpow,ered quench pumpwithin containment, and overhead
limestone and gypsum conveyors All stormwater runoff from Drainage,Area 26 is routed
into a detention pond located at the southwestern corner of the drainage area This collected
stormwater discharges into the Transfer Sump that subsequently pumps to Sump #2
Ash Settling Basin Drainage Areas:
The following drainage areas are located within the ash settling basin watershed and
discharge via gravity flow to the ash settling basin
Drainage Area 13 — FGD Gypsum Radial Stacker
Drainage Area 13 encompasses approximately 6 acres and is located in the southern area of
the ash settling basin watershed This drainage area includes the FGD gypsum radial
stacker operation and portions of an adjacent soil borrow area Stormwater, runoff from this

area enters a detention basin before discharging into a tributary of the ash settling basin to
the north
Drainage Area 14 - Soil Borrow Area
Drainage Area 14 encompasses approximately 6 acres and is located west of Drainage
Areal3 This drainage area includes the remaining portions of the soil borrow area
Stormwater runoff from this area enters a detention basin on the west side of the drainage
area before discharging' into a small creek that flows to the, ash settling'basin
Drainage Area 15 - FGD Landfill
Drainage Area 15 encompasses approximately 20 acres and ,is located in the western area
of the ash settling basin watershed This drainage area includes the FGD residue landfill
Stormwater runoff from this area enters a detention basin at -the southeastern edge of the
landfill and is subsequently piped via gravity flow to the ash settling basin This landfill also
includes FGD wastewater treatment sludge; asbestos, flyash; bottom ash, rnill'rejects, and
construction and demolition debris
Drainage Area 16 — Coal Pile
Drainage Area 16 encompasses approximately 40 acres and is located in the southern area
of the ash settling_ basin watershed This drainage area is comprised entirely of the station
coal storage pile Stormwater,runoff from this area enters perimeter, ditches that discharge
into the ash basin
Drainage Area 17 — Sanitary Wastewater Lagoon
Drainage Area 17 encompasses approximately 4 5 ,acres,and is located east of the coal pile
in the southern area of the ash settling basin watershed This drainage area is -comprised of
the sanitary wastewater treatment lagoon and surrounding area Stormwater runoff
discharges into the ash basin to the north
Drainage Area 18 — FGD Constructed Wetland Treatment System
Drainage Area 18 encompasses approximately 40 acres and is located west of the ash'
settling basin. This drainage area, is comprised of the constructed wetland treatment system
(CWTS) designed to treat wastewater from the FGD'sohd removal wastewater treatment
system Stormwater runoff from the CWTS area flows into the adjacent ash settling basin
Drainage Area 19 — Bottom Ash Operation and Pyrite Operation
Drainage Area 19 encompasses approximately 35 acres and is located north of the coal pile
This drainage area includes the bottom ash operation and recovery of coal from pyrites All
stormwater runoff'from this area is touted via ditches into the ash settling basin
Drainage Area 20 - Closed Ash Landfill
Drainage Area 20 encompasses approximately 58 acres and is located in the northern, area
of the ash settling basin Vatershed This drainage area includes the closed and capped ash
landfill. All stormwater runoff from this area is routed via ditches into the ash settling basin
Drainage Area 21 - Beneficial Structural Fill
Drainage Area 21 encompasses approximately 84 acres and is located in the northern area
of the ash settling basin watershed This drainage area includes the active beneficial ash
structural fill All stormwater runoff from this.area is routed via, ditches into the ash settling'
basin

NCDENR
NO CAROUNA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
FOR AGENCY USE ONLY
Date,Recetved
Division of Water Quality / Surface Water Protection Ycar Monti, Day,
National Pollutant Discharge Elimination System
REPRESENTATIVE OUTFALUSTATUS� (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 Pe'rmit (or) Certificate of'Coverage
2) Facility Information:
Owner/Facility Name Duke Energy Carolinas, LLC
Marshall,Steam Station 8320 East NC Highway 150, Terrell, NC 28682
Facility Contact
Mark McGary
Street Address
PO Box'1006 Mail Code EC13K_
City
Charlotte
E-mail Address
[e-mail]
Telephone No.
980-373-7898
,State NC ZIP Code 28201
Fax -
3) List the representative outfall(s) information (attach additional -sheets if necessary):
Outfalls) SWO03 is representative of Outfalls) SW001,.SW002„SW003, SW004, SW012, SW022 and
SWO23
Outfalls' drainage,areas have the same or similar activities? uAles ❑ No
Outfalls' drainage areas,contain the same�or similar materials? VYes ❑ No
Outfalls have similar monitoring results? ❑ Yes ❑ No oyNo data*
Outfalls) SWO07 is representative of Outfall(s) SW006, SW007, SW008„SW009.and_SW011
Outfalls' drainage areas have the same or similar activities? VYes ❑ No
Outfalls' drainage areas contain the same or similar materials? Yes ❑ No
Outfalls have similar momtormg,results?I
ii,Yes❑ No Ao data*
*Non-compliance with analytical monitoring prior to this request may prevent ROS approval. Specific
circumstances will be considered bythe 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.
Page 1 of 3
SWU-ROS-2009 Last revised 12/30/2009

Representative Outfall Status Request
See attached representative outfalls summary table
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,
reppet,�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 ormonitoring device
or method required to be,operated or maintained under this Article3or'rules of'the [Environmental Management]
Commission implementing th&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 l 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- Stephen J. Immel
Title- General Manwomill
<5T_ QJ"V__Q
(Signature 01 Applicant) jDatA 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.com,pleted 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
Cl 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

Representative Outfall Status Request
Notes
The submission of this document does not guarantee Representative Outfall Status (ROS) will be granted as
requested. Analytical monitoring as per your current permit must be continued, at all outfalls, until written
approval of this request is granted by DWQ. 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.
For questions, please contact the DWQ Regional Office for your area.
Asheville Regional Office
2090 U.S. Highway 70
Washington Regional Office
Swannanoa, NC 28778
943 Washington Square Mall
Mooresville, NC 28115
Washington, NC 27889
Phone [phone]
Phone [phone]
FAX [phone]
Phone [phone]
FAX [phone]
FAX [phone]
Fayetteville Regional Office
Central Office
Systel Building,
Wilmington Regional Office
225 Green St., Suite 714
127 Cardinal Drive Extension
Fayetteville, NC 28301-5094
Wilmington, NC 28405
Phone [phone] Phone [phone]
FAX [phone] FAX [phone]
Mooresville Regional Office
Winston-Salem Regional Office
610 East Center Ave.
585 Waughtown Street
Mooresville, NC 28115
Winston-Salem, NC 27107
Phone [phone]
Phone [phone]
Water Quality Main FAX [phone]
FAX [phone]
Central Office
Raleigh Regional Office
1617 Mail Service Center
1628 Mail Service Center
Raleigh, NC 27699-1617
Raleigh, NC 27699-1628
Phone [phone]
Phone [phone]
FAX [phone]
FAX [phone]
Page 3 of 3
SWU-ROS-2009 Last revised 12/30/2009

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