NC0000396_Modification_20181204

DUKE
iC ENERGY,
PROGRESS
Sent by UPS
File No.: 12520B-01
November 29, 2018
Ms. Julie Grzyb
Division of Water Resources
Water Quality Permitting Section - NPDES
1617 Mail Service Center
Raleigh, NC 27699- l 617
Re: NPDES Permit Modification Package
Asheville Steam Electric Plant
NPDES Permit # NCO000396
Buncombe County
Dear Ms. Grzyb,
Garry A. Whisnanl
Plant General Manager
Asheville Steam Electric Plant
Duke Energy Progress
ASVL PLT 1200 CP&L Dr
Arden, NC 28704
o: 828•687.5211
t 828•687-5204
garry whisnanWaluke-energy.com
Duke Energy Progress, LLC is submitting a NPDES Permit Modification Package to request a
modification to the existing NPDES permit NC0000396. The proposed modification for Outfall
001 will contain discharges associated with new combined -cycle natural gas plant consisting two
power blocks with a combined summer/winter capacity rating of 500 (megawatts) MW/ 560
MW. Outfall 001 will continue to discharge directly to the French Broad River through the
existing outfall. The new Combined Cycle is scheduled to begin operation in November 2019.
The existing permitted Outfall 001 contains ash pond/rim ditch discharges, ash transport water,
coal pile runoff, stormwater runoff, various low volume wastes (such as boiler blowdown,
backwash from the water treatment processes, ash hopper seal water, plant drains), air preheater
cleaning water and chemical metal cleaning wastewater discharged from Internal OutfaIl
004(potentially). The modified Outfall 001 will contain discharges from rim ditch, stormwater
runoff, cooling tower blow down, low volume waste, oil water separators and other waters from
the Combustion Turbine Facility. Ash removal will continue through 2022 this waste stream
will also remain as a contributor to the effluent of Outfall 001.
The Asheville facility currently consists of two coal fired units (Units 1 and 2) with a combined
summer/winter capacity rating of 378 (MW)/384 MW. Operations for the coal-fired units will
cease by January 30, 2020 in compliance with Section 2 of the Mountain Energy Act (Sec 2 of
S.L.2015-110). Currently existing is also two combustion turbines (Units 3 and 4) with a
combined summer/winter capacity rating of 320 MW/370 MW, these two units will remain in
operation with the new Combined Cycle Facility.

Duke Energy Progress, Inc.
Asheville Steam Electric Generating Plant
NPDES Permit Modification Package
NPDES Permit No. NC0000396
Buncombe County
Included with this submittal are the follow:
• Supplemental Information
• Attachment A — Form 1 — Item XI - Map
• Attachment B — EPA Form I & Form 2C
• Attachment C — Process Flow Diagrams & Water Flow Volumes Tables
• Attachment D - Form 2C Item II — B Descriptions of Flows, Sources of Pollution and
Treatment Technologies
• Attachment E — Thermal Mixing Zone Report
• Attachment F - Form 2C Item VI Potential Discharges Not Covered By Analysis
• Attachment G — Effluent Characteristics of Internal Outfalls
EPA Form 2C Section V Part A, B, and C are estimated values based upon existing facilities
with similar operating units and wastewater discharges.
As required for an NPDES major modification application, a check (#1000036347), in the
amount of $1,030.00, was submitted to your office separately and confirmed received. A copy is
attached to this correspondence for reference.
If you have any questions or need additional information or clarification, please contact Tina
Woodward at [e-mail] or 704-382-4585
I certify, under penalty of late, that this document and all attachments were prepared under my
direction or supervision in accordance tvith 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, trite, accurate, and complete. 1 am
aware that there are significant penalties for submitting false infonnation, including the possibility of
fines and imprisonment for knowing violations.
Sincerely,
A,,rA w"
Garry Whisnant
Plant Manager
Asheville Steam Plant — Combined Cycle
Enclosures

Duke Energy Progress, Inc
Asheville Steam Electric Generating Plant
NPDES Permit Modification Package
NPDES Permit No. NC0000396
Buncombe County
cc: Sergei Chernikov
Complex NPDES Permit Supervisor
1617 Mail Service Center
Raleigh, NC 27699-1617
Landon Davidson
Asheville Regional Office Supervisor
2090 U.S. Highway 70
Swannanoa, NC 28778

Duke Energy Progress, Inc.
Asheville Steam Electric Generating Plant
NPDES Permit Modiricalion Package
NPDES Permit No, NC0000396
Buncombe County
bc: Teresa Williams
Anne Pifer
Jim Wells
Richard Baker
Matt Hanchey
Shannon Langley
Erika Tuchbaurn
Tina Woodward
Jeff Blackwood

DA2157
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MIKE ENERGY PROGNEk�., LLC
480 S TRYON STREET
ACCOUNTS PAYABLE - 5T258
CHARLOTTE, NC 26202
004970 RjKTT1A
NORTH CAROLINA OEPARrMENT OF
ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
1617 MAIL SERVICE CENTER
RALEIGH NC 27699 1617
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Remittance Advice
Page 1 of 1
Date: 11/21/2018
Check #: 1000036347
Payment Amount: 1, 030.00
Vendor* 0000071949
Voucher ID 0 - linvoiceGrossArntl Discount Amount I Invoice Net Aml
10569521 1,030.00 0.00 1,030.00
PLEASE DETACH BEFORE DEPOSITING CHECK
SHADED AREA MUST GRADUALLY CHANGE FROM BLUE AT TOP TO GREEN AT BOTTOM
OINtE ENERGY P1106RES5, LLC
400 5 TRYON STREET
ACCOUNTS PAYABLE - ST2S8
CHARLOTTE, INC ZB202
DUKE
ENERGY.
Pay Exactly "One Thousand Thirty and 00/100 -US Dollars "
TO THE NORTH CAROLINA DEPARTMENT OF
ORDER ENVIRONMENTAL QUALITY
OF
WELLS FARGO BANK, N.A.
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Date: 11/ 21/2018
Check#: 1000036347
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Duke Energy Progress, LLC.
Asheville Steam Electric Plant
NPDES Permit # NC0000396
Supplemental Information Package
Introduction and Background
Duke Energy Progress, LLC. (Duke) is submitting this additional supplemental information in support of
the NPDES permit modification package for the Asheville Steam Electric Plant (Plant). This submittal is
intended to provide alternatives for closure of the 1964 ash basin that will be necessary to comply the
Federal Coal Combustion Residual (CCR) rule, the North Carolina Coal Ash Management Act of 2014,
HB 630 of 2016 and the Senate Bill 716: Mountain Energy Act of 2015.
Supplemental information is also provided for the following:
1. A modified process flow path to Outfall 001
2. Addition of 4 internal Outfalls 001 A, 001 B, 001 C and 001 D
3. A request to remove Outfalls 004 and 005
4. Discussion of thermal mixing zone study
5. Compliance with CWA Section 316(b)
In total, there will remain three final external outfalls to waters of the State: Outfalls 001,002 and 101.
The process flows to Outfall 001 have changed and these changes have been documented with the
Division of Water Resources, NPDES regulatory permitting agency as described below. There are no
changes to Outfall 002; therefore, that outfall is not discussed in this supplemental information packet
(See attachment A entitled NPDES Outfalls). However, discharges from Outfall 002 will continue until
the closure of all coal-fired units. In order to facilitate compliance with the NPDES permit, Form 1
general information & Form 2C tables, and Flow diagrams, for the modification package are included in
Attachments B and C, respectively. EPA Form 2C Section V Part A, B and C are estimated values based
upon Duke Energy's Buck Combined Cycle Station in Rowan County, this facility has similar operating
units and wastewater discharges as the new Asheville combined cycle units. Attachment E are the
effluent characters of all the proposed internal outfalls.
Outfall 001 Current Condition
The 1964 Ash Basin Dam (BUNCO-097) was constructed in 1964 to serve as a wastewater treatment
facility for the treatment of ash sluice water. The surface area of the basin is approximately 45 acres. The
basin does not retain a permanent pool with the exception of a three -acre unlined retention pond known as
the open water area.
All ash is expected to be removed completely from the 1964 ash basin by applicable regulatory deadlines.
The Plant's remaining ash basin (hereinafter referred to as the 1964 ash basin), is located east of the French
Broad River, south of the plant and discharges into the French Broad River. With the approval of the North
2018 Asheville Combined Cycle
Permit Application

Carolina Department of Environmental Quality (NC DEQ), Duke relocated treated waters from the former
1982 ash basin and lined rim ditch to a downstream outfall location (Outfall 001) on the French Broad
River. The relocation of Outfall 001 was necessary to allow for enhancement to the dam of the 1964 ash
basin to meet current engineering standards. Production ash is sluiced to a concrete rim ditch system that
is located within the footprint of the 1964 Ash Basin. The rim ditch system also receives plant stormwater
drainage and low volume wastewater. CCR are dredged from the rim ditch, dewatered, and transported
off -site.
Historically, the wastewater from the rim ditch process was treated in the lined rim ditch system, then routed
to the open water area, and decanted to a settling pond outside of the 1964 Ash Basin. The settling pond
serves as the monitoring point for Outfall 001 of the Plant's NPDES permit. Water discharge from this
settling pond is routed directly to the French Broad River through the permitted outfall.
During 2016, wastewater flows and treatment were adjusted to facilitate the excavation of the 1982 Ash
Basin. The center pond filters were constructed at the end of the rim ditch and commissioned to replace
the treatment provided by the open water area. Infrastructure was developed to dewater the open water area
to the head of the rim ditch, and subsequently, the low volume waste and stormwater that flowed into the
1982 Ash Basin and pumped to the rim ditch was re-routed to the open water area.
The ash basin and/or rim ditch provides treatment by sedimentation and neutralization to the plant's waste
streams. Water leaves the rim ditch via weirs and curtains to the lined center pond where a skimmer pulls
water into 1 of 4 filter trains and flows via either the 1964 ash pond or direct discharge to a lined stilling
pond, where the discharge is treated by an automated pH system, where it is then discharged by overflow
to a pipe that coveys it to the French Broad River. Toe drains from the 1964 basin are currently collected
and pumped to the rim ditch and flow through the treatment system to outfall 001 and the French Broad
River.
Flue Gas Desulfurization Blowdown (Low Volume Waste)
This system is currently discharging to the Metropolitan Sewerage District (MSD) from the waste water
treatment building. The Flue Gas Desulfurization (FGD) system directs flue gas into an absorber where a
limestone (calcium carbonate) slurry is sprayed. Sulfur dioxide in the flue gas reacts with the limestone to
produce calcium sulfate (gypsum). This system reclaims any unreacted limestone slurry to be reused in the
absorber. A small blowdown stream is used to maintain the chloride concentration in the reaction tank.
The blowdown stream is passed through a clarifier to remove solids and reduce the chloride concentration
in the waste stream. Chemicals are used to adjust pH and to aid solids removal in the clarifier. The waste
stream enters a weir box and is discharged into a connection to MSD.
1964 Ash Basin Pre -closure Wastewater
Duke Energy is in the process of excavating ash from the 1964 ash basin which will continue through plant
retirement no later than January 31, 2020 and subsequent closure. It is anticipated that interstitial water will
be encountered early in the process as portions of the 1964 ash basin are being excavated. Duke Energy
plans to place the interstitial water discovered within the 1964 basin into the Rim Ditch and treat as
necessary to ensure compliance with permit limits prior to discharging through Outfall 001. It is Duke
Energy's understanding that this activity is permitted under North Carolina's NPDES wastewater permit
program, because the contents of this basin is regulated as a wastewater until leaving the treatment basin
2018 Asheville Combined Cycle
Permit Application

for disposal or beneficial use. Prior to moving the wastewater into the rim ditch, Duke will assure that (i)
all NPDES permit terms and conditions are being met; and (ii) any necessary dam safety approvals are
secured and that the work is being done in accordance with applicable dam safety guidelines and
requirements.
Outfall 001- Post Asheville Coal Fired Plant Closure (Anticipated November 2019)
This modification details below are proposed changes that will be implemented to accomplish dewatering
and ultimately closure of the 1964 ash basin.
The 1964 Ash Basin is currently void of free-standing water, except for the small open water area (described
above). Stormwater and wastewater flows into the open water area are captured and pumped to the head
of the rim ditch wastewater treatment system within the footprint of the 1964 Ash Basin.
As noted above, the settling treatment provided by the open water area was replaced by a filtration
system. The filtration system meets existing permit requirements as it relates to the treatment previously
provided by the open water area. The treated wastewater continues to flow to the permitted NPDES Outfall
001. The open water area is used for retention of the 1964 Basin and the low volume stormwater and
wastewater flows.
Contact and interstitial water from the 1964 Ash Basin excavation will also be pumped to the rim ditch
wastewater treatment system, including filtration until station retirement and demolition of the rim ditch.
The installation of two fully redundant treatment trains. Each treatment train would treat 400 to 500 gpm
flows, removing suspended solids and associated metals. One treatment train could be eliminated in the
future once LVWS is eliminated by demolition, which is tentatively scheduled for August 2021. This will
also include a lined settling basin (side hill basin) to segregate the LVWS that is a non-CCR waste stream
from the 1964 basin. This process may also require a tank by the treatment plant to equalize interstitial
water.
Outfall 001— Fully operational Combined Cycle (Anticipated January 2020) & Discussion of proposed
Internal Outfalls
This modification details below are proposed changes that will be implemented after the full
decommissioning of the coal units that is anticipated to be in January 2020. The overall water treatment
flows and streams of wastewater that that will contribute to Outfall 001 are described below. This section
includes the discussion of new requested internal outfalls that will ultimately be discharged to the
wastewater sump.
Raw water is put through an ultrafiltration (UF) process before being stored in the service water tanks. The
OF backwash is collected in a sump and then pumped into the cooling tower basin for re -use in the
condenser circulating water system. Some of this water will be present in the cooling tower blowdown.
Demineralized water for HRSG makeup and CTG fuel oil operation is put through a Reverse Osmosis (RO)
process, which has a reject flow that is collected in the OF backwash sump and then pumped into the cooling
tower basin. Both the OF and RO share a common clean -in -place (CIP) system. The chemical solution
waste from the CIP system is discharged to the Neutralization tank. Neutralization waste is discharged in
the OF backwash sump and then pumped to the cooling tower basin.
2018 Asheville Combined Cycle
Permit Application

The cooling towers dissipate waste heat through evaporation and the concentration of dissolved solids is
controlled via blowdown to the common wastewater collection sump. The cooling towers will be treated
with dispersant, corrosion inhibitor, and sodium hypochlorite. Each cooling tower utilizes side stream filters
to limit the accumulation of solids in the basin. Cooling tower blowdown is treated with sodium bisulfate
for residual chlorine removal. HRSG Blowdown is routed to the cooling tower for re -use in the condenser
circulating water system. This water will be part of the cooling tower blowdown, which is routed to the
wastewater collection sump via the Internal Outfalls. The cooling tower units 05/06 blowdown that is
discharged to the wastewater sump is proposed Internal Outfall 001A and cooling tower units 08/07
blowdown is proposed Internal Outfall 001C.
Various plant equipment, including fuel oil storage tanks, transformers, etc., requires containment areas for
spills. Storm water collected in these areas is visually inspected for the presence of oil and is either released
through the storm drains system or routed through the plant drains to an oil water separator. The discharge
from the oil water separators is sent to the proposed Internal Outfall 00113 described below.
Each combined cycle power block has an oil water separator to trap oil before discharging to the wastewater
collection sump. Potentially oily waste is collected from equipment and area drains in the two turbine
building sumps and pumped through their respective oil water separator to the wastewater collection sump.
The oil -water separator connected to Unit 07/08 is proposed Internal Outfall 001B and the oil -water
separator connected to unit 05/06 is proposed Internal Outfall 0011). See Attachment E for the effluent
characters of all proposed internal outfalls.
Sanitary wastes are drained to an on -site lift station and pumped into the Buncombe County MSD manhole
on -site.
The wastewater collection sump that all Proposed Internal Outfalls discharge into will discharge to the
existing manhole north of the simple cycle treatment manhole #1, and then to outfall 001.
The ash basin and/or rim ditch provides treatment by sedimentation and neutralization to the plant's waste
streams. This waste stream will flow into the secondary settling basin which then discharges into Outfall
001.
Removal of Outfall 004 & 005
After the full decommissioning of the coal units that is anticipated in January 2020 and the complete
conversion to the Combined Cycle Plant configuration Internal Outfalls 004 & 005 will no longer be
needed. Currently Internal Outfall 004 discharges wastes from chemical metal cleaning treatment system.
Once the combine cycle units are operational a chemical metal cleaning treatment system will no longer be
needed. Internal Outfall 005, previously discharged wastewaters from the Flue Gas Desulfurization
(FGD) wet scrubber treatment system which also is not part of the combined cycle operational process and
should be removed.
Thermal Mixing Zone Study
A thermal mixing zone study was completed for the Asheville Stream Electric Plant for Outfall 001. The
report is included as Attachment E. The instream bathymetry and velocity data was collect for the study
2018 Asheville Combined Cycle
Permit Application

on August 28, 2018. The study included both field data collection and the Cornell Mixing Zone Expert
System (CORMIX) modeling of the discharge plume. A CORMIX (Version 11.0) model was developed
that predicts that even under conservative conditions, the resulting thermal mixing zone will be relatively
small. The model predicts that for December through February (winter months) and March through
November, at permitted temperatures of 73.0°F and 89.0°F respectively, the 2.8°C (5.04°F) "rise -above -
background" and 29°C (84.2°F) maximum instream standards will be met at a distance less than 40.5 meters
(approximately 133 feet) downstream of the outfall. Because the temperature excess is significantly greater
in the winter months, the winter thermal mixing zone will be significantly larger than during the remainder
of the year. Therefore, only the winter model case was included in the study. The model also predicts that
the winter plume width will be no wider than 7.5 meters (approximately 25 feet) across the stream, thereby
allowing safe passage of organisms around the plume.
Based on the results of the conservative model included in the report, Duke is requesting that the permit
modification only include the 73.0°F winter (December through February) and 89.0°F (remaining months)
daily maximum permit limitations, to be monitored by weekly grab sampling. The actual discharge
temperatures are anticipated to be less than the maximum permit limits.
CWA Section 316(b)
In a previous Modification package for the Ashville Stream Electric Plant, Duke Energy contested the
application of the 316(b) Rule for Existing Facilities to the coal-fired station. As stated previously, the
renewed NPDES permit for Asheville Steam Station will expire after the scheduled retirement date,
therefore no further action is required for the Asheville Steam Station to meet the 316(b) requirements for
existing facilities. The planned Asheville Combined -cycle station is expected to be classified as a new
unit at an existing facility per 40 C.F.R. § 125.92(u). As required by 40 C.F.R. § 125.95(b)(1), Duke has
submitted the required documentation in 9/14/2018 stated in 40 C.F.R. § 122.2 1 (r)(2) — (8) and (14).
2018 Asheville Combined Cycle
Permit Application

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
Attachment A
Form 1— Item XI - Map

Outfall 001, Subbasin: 04-03-02
Latitude: 35°28'03"
Longitude: 82°32'56"
Receiving Stream: French Broad River, Class B
Outfall 002, Subbasin: 04-03-02
Latitude: 35°28'10"
Longitude: 82°32'20"
Receiving Stream: Lake Julian, Class C
Attachment 1 - Form
1- Item XI - Map
NC0000396 — Asheville Steam Electric Gen. Plant
Buncombe Count

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
Attachment B
EPA Form 1 & Form 2C

Please print or type in the unshaded areas only.
Form Approved. OMB No. 2040-0086.
FORM
U.S. ENVIRONMENTAL PROTECTION AGENCY
I. EPA I.D. NUMBER
S
T/A c
NC 0 0 0 0 3 9 6
1
\-EPA GENERAL INFORMATION
F
Consolidated Permits Program
p
GENERAL
(Read the "General Instructions" before starting.)
3 id 15 2
LABEL ITEMS
GENERAL INSTRUCTIONS
f a preprinted label has been provided, affix it in the
designated space. Review the information carefully; if any of it
I. EPA I.D. NUMBER
is incorrect, cross through it and enter the correct data in the
appropriate fill-in area below. Also, if any of the preprinted data
is absent (the area to the left of the label space lists the
III. FACILITY NAME
PLEASE PLACE LABEL IN THIS
SPACE
information that should appear), please provide it in the proper
fill-in area(s) below. If the label is complete and correct, you
need not complete Items I, III, V, and VI (except VI-8 which
V. FACILITY MAILING
ADDRESS
must be completed regardless). Complete all items if no label
has been provided. Refer to the instructions for detailed item
descriptions and for the legal authorizations under which this
VI. FACILITY LOCATION
data is collected.
II. POLLUTANT CHARACTERISTICS
INSTRUCTIONS: Complete A through J to determine whether you need to submit any permit application forms to the EPA. If you answer "yes" to any questions, you must
submit this form and the supplemental form listed in the parenthesis following the question. Mark "X" in the box in the third column if the supplemental form is attached. If
you answer "no" to each question, you need not submit any of these forms. You may answer "no" if your activity is excluded from permit requirements; see Section C of the
instructions. See also, Section D of the instructions for definitions of bold-faced terms.
Mark x"
Mark "X"
YES
NO
FORM
ATTACHED
YES
No
FORM
ATTACHED
SPECIFIC QUESTIONS
SPECIFIC QUESTIONS
A. Is this facility a publicly owned treatment works which
B. Does or will this facility (either existing or proposed)
results in a discharge to waters of the U.S.? (FORM 2A)
X
include a concentrated animal feeding operation or
X
aquatic animal production facility which results in a
16
17
18
19
26
21
discharge to waters of the U.S.? (FORM 2B)
C. Is this a facility which currently results in discharges to
waters of the U.S. other than those described in A or B
�/
X
�/
X
D. Is this a proposed facility (other than those described in A
or B above) which will result in a discharge to waters of
X
above? (FORM 2C)
the U.S.? (FORM 2D)
zz
2a
z4
zs
26
27
E. Does or will this facility treat, store, or dispose of
F. Do you or will you inject at this facility industrial or
hazardous wastes? (FORM 3)
X
municipal effluent below the lowermost stratum
X
containing, within one quarter mile of the well bore,
underground sources of drinking water? (FORM 4)
28
29
30
31
32
33
G. Do you or will you inject at this facility any produced water
H. Do you or will you inject at this facility fluids for special
or other fluids which are brought to the surface in
processes such as mining of sulfur by the Frasch process,
connection with conventional oil or natural gas production,
X
solution mining of minerals, in situ combustion of fossil
X
inject fluids used for enhanced recovery of oil or natural
fuel, or recovery of geothermal energy? (FORM 4)
gas, or inject fluids for storage of liquid hydrocarbons?
(FORM 4)
34
35
36
37
38
39
I. Is this facility a proposed stationary source which is one
J. Is this facility a proposed stationary source which is
of the 28 industrial categories listed in the instructions and
�/
X
NOT one of the 28 industrial categories listed in the
�/
X
which will potentially emit 100 tons per year of any air
instructions and which will potentially emit 250 tons per
pollutant regulated under the Clean Air Act and may affect
year of any air pollutant regulated under the Clean Air Act
40
41
42
43
44
45
or be located in an attainment area? (FORM 5)
and may affect or be located in an attainment area?
(FORM 5)
III. NAME OF FACILITY
SKIP Asheville Steam Electric Plant
J1C
15
i6 - 29
30
69
IV. FACILITY CONTACT
A. NAME & TITLE (last, first, & title)
B. PHONE (area code & no.)
J2c
W isnant, Garry A. Plant Manager
( 2) 6 7-5 1
15
16
45 46 48 1 49 51 1 52- 55
V. FACILTY MAILING ADDRESS
A. STREET OR P.O. BOX
ce Energy Lane
3 J46 Du
5 16
45
B. CITY OR TOWN
C. STATE I D. ZIP CODE
c
J4 Arden
15 16
C11 2 704
40 41 42 47 51
VI. FACILITY LOCATION
A. STREET, ROUTE NO. OR OTHER SPECIFIC IDENTIFIER
J5c 46 u e Energy Lane
5 16
45
B. COUNTY NAME
Buncombe
46
70
C. CITY OR TOWN
D. STATE
I E. ZIP CODE
F. COUNTY CODE (if known)
c
6
Ard n
C
JA71J4
15
16
40
4, 42
47 51
52 -54
EPA Form 3510-1 (8-90) CONTINUE ON REVERSE

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VIII. OPERATOR INFORMATION
A. NAME IS Is the name listed in Item
g gY Energy 9 0 YESgo the l7 NO owner?
13 Pro ress 'Energy Carolinas, Inc d/b/a/ Duke Ener Progress, LLC
C STATUS OF OPERATOR (Filler the appnrprrate teller into the anra er ham rf 'Ocher s L, 16
D. PHONE (area axle & no,)
F = FEDERAL M = PUBLIC (inherthanfederal or state)
S=STATE
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(spe,(5)
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657-5211
O= OTHER (tpecrh)
P = PRIVATE
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E. STREET OR P O BOX
4 u e nergy Lane
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F CITY OR TOWN
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I H ZIP CODE
I IX, INDIAN LAND
Is the facility located on Indian lands?
alArden
NC
28704
p YES 0 NO
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X. EXISTING ENVIRONMENTAL PERMITS
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13 le 17 1e p
1 151 le 17is 30
xl. MAP
Attach to this application a topographic map of the area extending to at least one mile beyond property boundaries. The map must show the outline of the facility, the
location of each of its existing and proposed intake and discharge structures each of its hazardous waste treatment, storage, or disposal facilities, and each well where it
injects fluids underground Include all springs rivers, and other surface water bodies in the map area See instructions for precise requirements.
XII. NATURE OF BUSINESS vide a brief descri 'on
Electric Utility - This facility is an electric generating facility currently consisting of:
- two coal fired units (Units 1 and 2) with a combined summer/winter capacity rating of 378 megawatts (14W)/384
MW (operations will cease by January 30, 2020 per Section 2 of the Mountain Energy Act).
-two combustion turbines (Units 3 and 4) with a combined summer/winter capacity rating of 320 MW/370 MW .
-two combined -cycle power blocks (PB) (PB 1 - Units 5 and 6, PS-2 Units 7 and 8) with a combined summer/winter
capacity rating of 500 MW/560 MW. Functional testing is scheduled to begin in March 2019 and the commercial
operation date is currently scheduled for November 2019.
XIII. CERTIFICATION (see instructions)
l certify under penalty of law that ! have personally examined and am familiar with the information submitted in this application and off attachments and that, based on my
inquiry of those persons immediately responsible for obtaining the information contained in the application. l befieve that the information is true, accurate, and complete
am aware that More are significant penalties for submitting false information including the possibility of fine and imprisonment.
A NAME 8 OFFICIAL TITLE (t fie or prier)
B. SIGNATURE
C. DATE SiGNED
Garry A. Whisnant, Plant Manager
/1
N
rffyrd
COMMENTS FOR OFFICIAL USE ONLY
jC
1e 1e
EPA Form 3510-1 (8.90)

EPA I.D. NUMBER (copyfromItem I ofform 1) Form Approved.
NC 0 0 0 0 3 9 6 OMB No. 2040-0086.
Please print or type in the unshaded areas only. Approval expires 3-31-98.
FORM
2C
NPDES
U.S. ENVIRONMENTAL PROTECTION AGENCY
APPLICATION FOR PERMIT TO DISCHARGE WASTEWATER
I'"iEPA EXISTING MANUFACTURING,, COMMERCIAL, MINING AND SILVICULTURE OPERATIONS
Consolidated Permits Program
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)
1. DEG.
2. MIN.
3. SEC.
1. DEG.
2. MIN.
3. SEC.
001
35
28
26
82
33
16
French Broad River
001A/001C
Internal Outfalls
001B/001D
Internal Outfalls
II. FLOWS, SOURCES OF POLLUTION, AND TREATMENT TECHNOLOGIES
A. Attach a line drawing showing the water flow through the facility. Indicate sources of intake water, operations contributing wastewater to the effluent, and treatment units
labeled to correspond to the more detailed descriptions in Item B. Construct a water balance on the line drawing by showing average flows between intakes, operations,
treatment units, and outfalls. If a water balance cannot be determined (e.g., for certain mining activities), provide a pictorial description of the nature and amount of any
sources of water and any collection or treatment measures.
B. For each outfall, provide a description of: (1) All operations contributing wastewater to the effluent, including process wastewater, sanitary wastewater, cooling water,
and storm water runoff; (2) The average flow contributed by each operation; and (3) The treatment received by the wastewater. Continue on additional sheets if
necessary.
1. OUT-
2. OPERATION(S) CONTRIBUTING FLOW
3. TREATMENT
FALL
NO. (list)
a. OPERATION (list)
b. AVERAGE FLOW
(include units)
a. DESCRIPTION
b. LIST CODES FROM
TABLE 2C-1
001
Combined cycle plant processes
570 gpm
Discharge to surface waters
1-U
9-n
including:
Cooling Tower Blowdown
470 gpm (est.)
Waste Water Flow (Unit 07/08)
50 gpm (est.)
Oil water separator Discharge
50 gpm (est.)
OFFICIAL USE ONLY (effluent guidelines sub -categories)
EPA Form 3510-2C (8-90) PAGE 1 of 4 CONTINUE ON REVERSE

CONTINUED FROM THE FRONT
C. Except for storm runoff, leaks, or spills, are any of the discharges described in Items II -A or B intermittent or seasonal?
❑ YES (complete the following table) ❑✓ NO (go to Section III)
3. FREQUENCY
4. FLOW
a. DAYS PER
WEEK
b. MONTHS
a. FLOW RATE (in mgd)
B. TOTAL VOLUME
(specify with units)
2. OPERATION(s)
1. LONG TERM
AVERAGE
2. MAXIMUM
DAILY
1. LONG TERM
AVERAGE
2. MAXIMUM
DAILY
1. OUTFALL
NUMBER (list)
CONTRIBUTING FLOW
(list)
(specify
average)
PER YEAR
(specify average)
C. DURATION
(in days)
III. PRODUCTION
A. Does an effluent guideline limitation promulgated by EPA under Section
304 of the
Clean Water
Act apply to your
facility?
✓❑ YES (complete Item III-B)
❑
NO (go to Section
IT)
B. Are the limitations in the applicable effluent guideline expressed in terms of production (or other measure of operation)?
❑ YES (complete Item III-0 Q NO (go to Section IT)
C. If you answered "yes' to Item III-B, list the quantity which represents an actual measurement of your level of production, expressed in the terms and units used in the
applicable effluent guideline, and indicate the affected outfalls.
1. AVERAGE DAILY PRODUCTION
2. AFFECTED OUTFALLS
(list outfall numbers)
a. QUANTITY PER DAY
b. UNITS OF MEASURE
c. OPERATION, PRODUCT, MATERIAL, ETC.
(specify)
NA
IV. IMPROVEMENTS
A. Are you now required
by any Federal, State or local
authority to meet any implementation schedule for the construction,
upgrading or operations 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.
❑ YES (complete
the following table)
El NO (go to Item IV-B)
1. IDENTIFICATION OF CONDITION,
AGREEMENT, ETC.
2. AFFECTED OUTFALLS
3. BRIEF DESCRIPTION OF PROJECT
4. FINAL COMPLIANCE DATE
a. NO.
b. SOURCE OF DISCHARGE
a. REQUIRED
b. PROJECTED
B. OPTIONAL: You may attach additional sheets describing any additional water pollution control programs (or other environmental projects which may affect your
discharges) you now have underway or which you plan. Indicate whether each program is now underway or planned, and indicate your actual or planned schedules for
construction.
❑ MARK "X" IF DESCRIPTION OF ADDITIONAL CONTROL PROGRAMS IS ATTACHED
EPA Form 3510-2C (8-90) PAGE 2 of 4 CONTINUE ON PAGE 3

EPA I.D. NUMBER (copyfrom Item I ofForm 1)
CONTINUED FROM PAGE 2 NC0000396
V. INTAKE AND EFFLUENT CHARACTERISTICS
A, B, & C: See instructions before proceeding — Complete one set of tables for each outfall — Annotate the outfall number in the space provided.
NOTE: Tables V-A, V-B, and V-C are included on separate sheets numbered V-1 through V-9.
D. Use the space below to list any of the pollutants listed in Table 2c-3 of the instructions, which you know or have reason to believe is discharged or may be discharged
from any outfall. For every pollutant you list, briefly describe the reasons you believe it to be present and report any analytical data in your possession.
1.POLLUTANT
2.SOURCE
1.POLLUTANT
2.SOURCE
NA
BY ANALYSIS
or a component of a substance which you
below) ❑✓
currently use or manufacture as an intermediate
NO (go to Item VI-B)
or final product or byproduct?
VI. POTENTIAL DISCHARGES NOT COVERED
Is any pollutant listed in Item V-C a substance
❑ YES (list all such pollutants
NA
EPA Form 3510-2C (8-90) PAGE 3 of 4 CONTINUE ON REVERSE

CONTINUED FROM THE FRONT
VII. 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 (identify the test(s) and describe their purposes below) ❑ NO (go to Section VIII) ❑✓
Current NPDES permit requires quarterly chronic toxicity testing. Permit NC0000396 issued November 8, 2018
with an effective date of December 1, 2018 requires monthly chronic toxicity testing.
Vill. CONTRACT ANALYSIS INFORMATION
Were any of the analyses reported in Item V performed by a contract laboratory or consulting firm?
❑ YES (list the name, address, and telephone number of, and pollutants analyzed by, NO (go to Section IX)
each such laboratory or firm below)
A. NAME
B. ADDRESS
C. TELEPHONE
(area code & no.)
D. POLLUTANTS ANALYZED
(list)
NA - All values in Item V are
estimated values.
IX. CERTIFICATION
I 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. I 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 orprint)
B. PHONE NO. (area code & no.)
Garry A. Whisnant, Plant Manager
[phone]
C. SIGNATURE
D. DATE SIGNED
EPA Form 3510-2C (8-90) PAGE 4 of 4

PLEASE PRINT OR TYPE IN THE UNSHADED AREAS ONLY. You may report some or all of this information EPA I.D. NUMBER (copyfrom Item I of Form 1)
on separate sheets (use the same format) instead of completing these pages. NC 0 0 0 0 3 9 6
SEE INSTRUCTIONS.
OUTFALL NO.
V. INTAKE AND EFFLUENT CHARACTERISTICS (continued from page 3 of Form 2-C) 001
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.
3. UNITS
4. INTAKE
2. EFFLUENT
(specifyifblank)
(optional)
b. MAXIMUM 30 DAY VALUE
c. LONG TERM AVRG. VALUE
a. LONG TERM
a. MAXIMUM DAILY VALUE
(ifavailable)
(ifavailable)
AVERAGE VALUE
. N-
aCONCE
b. NO. OF
(1)
(1)
. .
dNOOF
(1)
1. POLLUTANT
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
(1) CONCENTRATION
(2) MASS
ANALYSES
TRATION
b. MASS
CONCENTRATION
(2) MASS
ANALYSES
a. Biochemical Oxygen
2.8
27.1
mg/L
lb/day
All
values
est.
Demand (BOD)
b. Chemical Oxygen
23
222.6
mg/L
lb/day
Demand (COD)
c. Total Organic Carbon
8
77.4
mg/L
lb/day
(TOC)
d. Total Suspended
Solids (TSS�
9
87 . 1
m /L
g
lb/day
e. Ammonia (asN)
0.12
1.1
mg/L
lb/day
VALUE
VALUE
VALUE
VALUE
f.Flow
1.16
0.69
0.21
12
MGD
N/A
g. Temperature
VALUE
VALUE
VALUE
°C
VALUE
(winter)
22
h. Temperature
VALUE
VALUE
VALUE
oC
VALUE
(summer)
MINIMUM
MAXIMUM
MINIMUM
MAXIMUM
i. pH
7.21
(est.)
STANDARD UNITS
PART B — Mark "X" in column 2-a for each pollutant you know or have reason to believe is present. Mark "X" in column 2-b for each pollutant you believe to be absent. If you mark column 2a for any pollutant which is limited either
directly, or indirectly but expressly, in an effluent limitations guideline, you must provide the results of at least one analysis for that pollutant. For other pollutants for which you mark column 2a, you must provide
quantitative data or an explanation of their presence in your discharge. Complete one table for each outfall. See the instructions for additional details and requirements.
2. MARK "X"
3. EFFLUENT
4. UNITS
5. INTAKE (optional)
1. POLLUTANT
b. MAXIMUM 30 DAY VALUE
c. LONGTERM AVRG. VALUE
a. LONG TERM AVERAGE
AND
a
b.
a. MAXIMUM DAILY VALUE
(ifavailable)
(ifavailable)
VALUE
CAS NO.
BELIEVED
BELIEVED
d. NO. OF
a. CONCEN-
b. NO. OF
(1)
(1)
(1)
(1)
(ifavailable)
PRESENT
ABSENT
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
ANALYSES
TRATION
b. MASS
CONCENTRATION
(2) MASS
ANALYSES
a. Bromide
(24959-67-9)
�/
X
< 0.10
< 1.0
mg/L
lb/d
All
value
est .
b. Chlorine, Total
< 0.05
< 0.5
mg/L
lb/d
Residual
c. Color
X
20.00
N/A
SU
N/A
d. Fecal Coliform
X
10.00
N/A
Co/100mL
N/A
e. Fluoride
(16984-48-8)
X
0.28
2.7
mg/L
lb/d
f. Nitrate -Nitrite
0.032
0.3
mg/L
lb/d
(as N)
EPA Form 3510-2C (8-90) PAGE V-1 CONTINUE ON REVERSE

ITEM V-B CONTINUED FROM FRONT
2. MARK "X"
3. EFFLUENT
4. UNITS
5. INTAKE (optional)
1. POLLUTANT
b. MAXIMUM 30 DAY VALUE
c. LONGTERM AVRG. VALUE
a. LONG TERM
AND
a
b.
a. MAXIMUM DAILY VALUE
(tfavailable)
(ifavailable)
AVERAGE VALUE
CAS NO.
BELIEVED
BELIEVED
d. NO. OF
a. CONCEN-
b. NO. OF
(�)
(if available)
PRESENT
ABSENT
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
ANALYSES
TRATION
b. MASS
CONCENTRATION
(2) MASS
ANALYSES
g. Nitrogen,
/
Total Organic (as
�X
1.00
9.7
mg/L
lb/d
all
Value
est.
N)
h. Oil and
Grease
Greas
X
<5.00
< 48.4
mg/L
lb/d
I. Phosphorus
(as P), Total
0.231
2.2
mg/L
lb/d
(7723-14-0)
j. Radioactivity
(1) Alpha, Total
X
< 5.00
N/A
pCi/1
N/A
(2) Beta, Total
X
8.62
N/A
pCi/l
N/A
(3)Radium,
< 1.00
N/A
pCi/l
N/A
Total
(4) Radium 226,
< 1.00
N/A
pCi/l
N/A
Total
k. Sulfate
(as SO4)
X
120.00
1161.6 6
lb/d
(14808-79-8)mg/L
I. Sulfide
(ass)
X
1.20
11.6
mg/L
lb/d
m. Sulfite
(assoj)
X
< 2.00
< 19.4
mg/L
lb/d
(14265-45-3)
n. Surfactants
x
0.072
0.7
mg/L
lb/d
o. Aluminum,
Total
X
0.17
1.6
mg/L
lb/d
(7429-90-5)
p. Barium, Total
(7440-39-3)
X
0.094
0.9
mg/L
lb/d
q. Boron, Total
(7440-42-8)
0.327
3.2
mg/L
lb/d
r. Cobalt, Total
< 0.001
< 0.0
mg/L
lb/d
(744048-4)
(7439-89-6)I
x0.262
2.5
mg/L
lb/d
t. Magnesium,
Total
X
9.82
95.1
mg/L
lb/d
(7439-95-4)
u. Molybdenum,
Total
0.024
0.2
mg/L
lb/d
(7439-98-7)
v. Manganese,
Total
u
0.101
1.0
mg/L
lb/d
(7439-96-5)
w. n, Total
(7 4l031-5)
x
< 0.01
< 0.1
mg/L
lb/d
x. Titanium,
Total
0.007
0.1
mg/L
lb/d
(7440-32-6)
EPA Form 3510-2C (8-90) PAGE V-2 CONTINUE ON PAGE V-3

EPA I.D. NUMBER (copyfromItem I of Form 1) OUTFALL NUMBER
CONTINUED FROM PAGE 3 OF FORM 2-C NC0000396 001
PART C - If you are a primary industry and this outfall contains process wastewater, refer to Table 2c-2 in the instructions to determine which of the GC/MS fractions you must test for. Mark "X" in column 2-a for all such GC/MS
fractions that apply to your industry and for ALL toxic metals, cyanides, and total phenols. If you are not required to mark column 2-a (secondary industries, nonprocess wastewater outfalls, and nonrequired GC/MS
fractions), mark "X" in column 2-b for each pollutant you know or have reason to believe is present. Mark "X" in column 2-c for each pollutant you believe is absent. If you mark column 2a for any pollutant, you must
provide the results of at least one analysis for that pollutant. If you mark column 2b for any pollutant, you must provide the results of at least one analysis for that pollutant if you know or have reason to believe it will be
discharged in concentrations of 10 ppb or greater. If you mark column 2b for acrolein, acrylonitrile, 2,4 dinitrophenol, or 2-methyl-4, 6 dinitrophenol, you must provide the results of at least one analysis for each of these
pollutants which you know or have reason to believe that you discharge in concentrations of 100 ppb or greater. Otherwise, for pollutants for which you mark column 2b, you must either submit at least one analysis or
briefly describe the reasons the pollutant is expected to be discharged. Note that there are 7 pages to this part; please review each carefully. Complete one table (all 7 pages) for each outfall. See instructions for
additional details and requirements.
2. MARK "X"
3. EFFLUENT
4. UNITS
5. INTAKE (optional)
1. POLLUTANT
b. MAXIMUM 30 DAY VALUE
c. LONG TERM AVRG.
a. LONG TERM
AND
a.
b.
C.
a. MAXIMUM DAILY VALUE
(ifavailable)
VALUE (ifavailable)
AVERAGE VALUE
CAS NUMBER
TESTING
BELIEVED
BELIEVED
d. NO. OF
a. CONCEN-
b. NO. OF
(ifavailable)
REQUIRED
PRESENT
ABSENT
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
ANALYSES
TRATION
b. MASS
CONCENTRATION
(2) MASS
ANALYSES
METALS, CYANIDE, AND TOTAL PHENOLS
1 M. Antimony, Total
X
3.01
0.03
ug/L
lb/d
all
Values
Est.
(7440-36-0)
2M. Arsenic, Total
36.7
0.36
ug/L
lb/d
(7440-38-2)
3M. Beryllium, Total
\/
X
< 1
< 0.01
ug/L
lb/d
(7440-41-7)
4M. Cadmium, Total
�/
< 0.1
< 0.00
ug/L
lb/d
(7440-43-9)
�\
5M.Chromium,
X
< 1
< 0.01
ug/L
lb/d
Total (7440-47-3)
6M. Copper, Total
\/
X
< 0.005
< 0.05
mg/L
lb/d
(7440-50-8)
7M. Lead, Total
X
< 1
< 0.01
ug/L
lb/d
(7439-92-1)
8M. Mercury, Total
0.000663
0.00
ug/L
lb/d
(7439-97-6)
9M. Nickel, Total
X
5.97
0.06
ug/L
lb/d
(7440-02-0)
Total Selen(778249-
X
1.5
0.01
ug/L
lb/d
Total (7782-49-2)
/ \
11M. Silver, Total
< 1
< 0.01
ug/L
lb/d
(7440-224)
12M. Thallium,
< 0.0002
< 0.0
mg/L
lb/d
Total (7440-28-0)
13M. Zinc, Total
0.006
0.06
mg/L
lb/d
(7440-66-6)
14M. Cyanide,
Total (57-12-5)
< 0.010
< 0.10
mg/L
lb/d
15M. Phenols,
< 0.005
< 0.0
mg/L
lb/d
Total
DIOXIN
2,3,7,8-Tetra-
DESCRIBE RESULTS
chlorodibenzo-P-
Dioxin (1764-01-6)
EPA Form 3510-2C (8-90) PAGE V-3 CONTINUE ON REVERSE

CONTINUED FROM THE FRONT
2. MARK "X"
3. EFFLUENT
4. UNITS
5. INTAKE (optionao
1. POLLUTANT
b. MAXIMUM 30 DAY VALUE
c. LONG TERM AVRG.
a. LONG TERM
AND
a.
b.
C.
a. MAXIMUM DAILY VALUE
(ifavailable)
VALUE (ifavailable)
AVERAGE VALUE
CAS NUMBER
TESTING
BELIEVED
BELIEVED
d. NO. OF
a. CONCEN-
b. NO. OF
(1)
(1)
(1)
(1)
(ifavailable)
REQUIRED
PRESENT
ABSENT
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
ANALYSES
TRATION
b. MASS
CONCENTRATION
(2) MASS
ANALYSES
GC/MS FRACTION -VOLATILE COMPOUNDS
1V.Accrolein
(107-02-8)
X
< 5
< 0.05
ug/L
lb/d
All
Values
Est.
2V. Acrylonitrile
< 5
< 0.05
ug/L
lb/d
(107-13-1)
( 1-43-2)ene
�/
/�
< 2
< 0.02
ug/L
lb/d
hl
r
methyl) Ether
met yl) t
(542-88-1)
5V. Br moform
�/
< 2
< 0.02
ug/L
lb/d
/`�
6V. Carbon
Tetrachloride
X
< 2
< 0.02
ug/L
lb/d
(56-23-5)
7V. Chlorobenzene
< 2
< 0.02
ug/L
lb/d
(108-90-7)
8V. Chlorodi-
\ /
bromomethane
x
< 2
< 0.02
ug/L
lb/d
(124-48-1)
9V. C
< 2
< 0.02
ug/L
lb/d
-13)oethane
10V. 2-Chloro-
ethylvinyl Ether
x
< 5
< 0.05
ug/L
lb/d
(110-75-8)
11V. Chloroform
< 2
< 0.02
ug/L
lb/d
12V. Dichloro-
bromomethane
X
< 2
< 0.02
ug/L
lb/d
(75-27-4)
13V. Dichloro-
difluoromethane
< 2
< 0.02
ug/L
lb/d
(75-71-8)
14V.1,1-Dichloro-
< 2
< 0.02
ug/L
lb/d
ethane (75-34-3)
15V.1,2-Dichloro-
< 2
< 0.02
u g /L
lb/d
ethane (107-06-2)
16V.1,1-Dichloro-
u
< 2
< 0.02
ug/L
lb/d
ethylene (75-35-4)
/ \
17V.1,2-Dichloro-
< 2
< 0.02
ug/L
lb/d
propane (78-87-5)
18V. 1,3-Dichloro-
propylene
< 2
< 0.02
ug/L
lb/d
(542-75-6)
19V. Ethylbenzene
�/
x
< 2
< 0.02
ug/L
lb/d
(100-41-4)
20V. Methyl
X
< 2
< 0.02
ug/L
lb/d
Bromide (74-83-9)
21V. Methyl
u
< 2
< 0.02
ug/L
lb/d
Chloride (74-87-3)
/ \
EPA Form 3510-2C (8-90) PAGE V-4 CONTINUE ON PAGE V-5

CONTINUED FROM PAGE V-4
2. MARK "X"
3. EFFLUENT
4. UNITS
5. INTAKE (optionao
1. POLLUTANT
b. MAXIMUM 30 DAY VALUE
c. LONG TERM AVRG.
a. LONG TERM
AND
a.
b.
C.
a. MAXIMUM DAILY VALUE
(ifavailable)
VALUE (ifavailable)
AVERAGE VALUE
CAS NUMBER
TESTING
BELIEVED
BELIEVED
d. NO. OF
a. CONCEN-
b. NO. OF
(1)
(1)
(1)
(1)
(ifavailable)
REQUIRED
PRESENT
ABSENT
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
ANALYSES
TRATION
b. MASS
CONCENTRATION
(2) MASS
ANALYSES
GC/MS FRACTION -VOLATILE COMPOUNDS (continued)
22V. Methylene
< 2
< 0.02
ug/L
lb/d
All
Values
Est
Chloride (75-09-2)
23V. 1,1,2,2-
Tetrachloroethane
X
< 2
< 0.02
ug/L
lb/d
79-34-5
24V.Tetrachloro-
X
< 2
< 0.02
ug/L
lb/d
ethylene (127-18-4)
25V. Toluene
X
< 2
< 0.02
ug/L
lb/d
(108-88-3)
26V.1,2- Trans -
Dichloroethylene
X
< 2
< 0.02
ug/L
lb/d
156-60-5
27V.1,1,1-Trichloro-
< 2
< 0.02
ug/L
lb/d
ethane (71-55-6)
28V.1,1,2-Trichloro-
X
< 2
< 0.02
ug/L
lb/d
ethane (79-00-5)
29VTrichloro-
X
< 2
< 0.02
ug/L
lb/d
ethylene (79-01-6)
30V. Trichloro-
fluoromethane
X
< 2
< 0.02
ug/L
lb/d
75-69-4
31V. Vinyl Chloride
< 2
< 0.02
ug/L
lb/d
(75-01-4)
GC/MS FRACTION -ACID COMPOUNDS
1A.2-Chlorophenol
< 10
< 0.10
ug/L
lb/d
(95-57-8)
2A.2,4-Dichloro-
X
< 10
< 0.10
ug/L
lb/d
phenol (120-83-2)
3A.2,4-Dimethyl-
< 10
< 0.10
ug/L
lb/d
phenol(105-67-9)
4A.4,6-Dinitro-0-
< 10
< 0.10
ug/L
lb/d
Cresol(534-52-1)
5A.2,4-Dinitro-
< 50
< 0.48
ug/L
lb/d
phenol(51-28-5)
6A.2-Nitrophenol
X
< 10
< 0.10
ug/L
lb/d
(88-75-5)
7A.4-Nitrophenol
< 10
< 0.10
ug/L
lb/d
(100-02-7)
8A. P-Chloro-M-
< 10
< 0.10
ug/L
lb/d
Cresol(59-50-7)
9A. Pentachloro-
X
< 10
< 0.10
ug/L
lb/d
phenol (87-86-5)
10A. Phenol
X
< 10
< 0.10
ug/L
lb/d
(108-95-2)
11A.2,4,6-Trichloro-
< 10
< 0.10
ug/L
lb/d
phenol (88-05-2)
EPA Form 3510-2C (8-90) PAGE V-5 CONTINUE ON REVERSE

CONTINUED FROM THE FRONT
2. MARK "X"
3. EFFLUENT
4. UNITS
5. INTAKE (optional)
1. POLLUTANT
b. MAXIMUM 30 DAY VALUE
c. LONG TERM AVRG.
a. LONG TERM
AND
a.
b.
C.
a. MAXIMUM DAILY VALUE
(ifavailable)
VALUE (ifavailable)
AVERAGE VALUE
CAS NUMBER
TESTING
BELIEVED
BELIEVED
d. NO. OF
a. CONCEN-
b. NO. OF
(1)
(1)
(1)
(1)
(ifavailable)
REQUIRED
PRESENT
ABSENT
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
ANALYSES
TRATION
b. MASS
CONCENTRATION
(2) MASS
ANALYSES
GC/MS FRACTION — BASE/NEUTRAL COMPOUNDS
1 B. Acenaphthene
All
Values
Est.
(83-32-9)
2B. Acenaphtylene
�/
(208-96-8)
3B. Anthracene
(120-12-7)
4B. Benzidine
�/
(92-87-5)
x
5B. Benzo (a)
Anthracene
�/
x
(56-55-3)
6B. Benzo (a)
�/
x
Pyrene (50-32-8)
7B.3,4-Benzo-
fluoranthene
X
(205-99-2)
8B. Benzo (ghi)
�/
x
Perylene (191-24-2)
9B. Benzo (k)
Fluoranthene
(207-08-9)
10B. Bis (2-Chloro-
ethoxy) Methane
(111-91-1)
11B. Bis (2-Chloro-
ethyl) Ether
�/
x
(111-44-4)
12B. Bis (2-
Chloroisopropyl)
Ether (102-80-1)
13B. Bis (2-Ethyl-
hexyl) Phthalate
(117-81-7)
14B. 4-Bromophenyl
Phenyl Ether
�/
x
(101-55-3)
15B. Butyl Benzyl
�/
x
Phthalate (85-68-7)
16B. 2-Chloro-
naphthalene
(91-58-7)
17B. 4-Chloro-
phenyl Phenyl Ether
�/
x
(7005-72-3)
18B. Chrysene
�/
x
(218-01-9)
19B. Dibenzo (a,h)
Anthracene
(53-70-3)
20B. 1,2-Dichloro-
�/
x
benzene(95-50-1)
21 B. 1,3-Di-chloro-
�/
benzene(541-73-1)
/�
EPA Form 3510-2C (8-90) PAGE V-6 CONTINUE ON PAGE V-7

CONTINUED FROM PAGE V-6
2. MARK "X"
3. EFFLUENT
4. UNITS
5. INTAKE (optionao
1. POLLUTANT
b. MAXIMUM 30 DAY VALUE
c. LONG TERM AVRG.
a. LONG TERM
AND
a.
b.
C.
a. MAXIMUM DAILY VALUE
(ifavailable)
VALUE (ifavailable)
AVERAGE VALUE
CAS NUMBER
TESTING
BELIEVED
BELIEVED
d. NO. OF
a. CONCEN-
b. NO. OF
(1)
(1)
(1)
(1)
(ifavailable)
REQUIRED
PRESENT
ABSENT
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
ANALYSES
TRATION
b. MASS
CONCENTRATION
(2) MASS
ANALYSES
GC/MS FRACTION — BASE/NEUTRAL COMPOUNDS (continued)
22B. 1,4-Dichloro-
All
Values
Est.
benzene (106-46-7)
23B. 3,3-Dichloro-
benzidine (91-94-1)
24B. Diethyl
Phthalate (84-66-2)
ethyl
la
Phthalate
(131 -11-3)
26B. Di-N-Butyl
Phthalate (84-74-2)
27B. 2,4-Dinitro-
toluene (121-14-2)
28B. 2,6-Dinitro-
toluene (606-20-2)
29B. Di-N-Octyl
Phthalate (117-84-0)
30B. 1,2-Diphenyl-
hydrazine (as Azo-
benzene) (122-66-7)
31B. Fluoranthene
(206-44-0)
32B. Fluorene
(86-73-7)
33B. Hexachloro-
benzene(118-74-1)
34B. Hexachloro-
butadiene (87-68-3)
35Bcycl Hexadiene-
cyclopentadiene
X
(77-47-4)
36B Hexachloro-
ethane (67-72-1)
37B.Indeno
(1,2,3-cd) Pyrene
(193-39-5)
38B. Isophorone
(78-59-1)
39B. Naphthalene
(91-20-3)
40B. Nitrobenzene
(98-95-3)
41B. N-Nitro-
sodimethylamine
(62-75-9)
42B. N-Nitrosodi-
N-Propylamine
(621-64-7)
EPA Form 3510-2C (8-90) PAGE V-7 CONTINUE ON REVERSE

CONTINUED FROM THE FRONT
2. MARK "X"
3. EFFLUENT
4. UNITS
5. INTAKE (optionao
1. POLLUTANT
b. MAXIMUM 30 DAY VALUE
c. LONG TERM AVRG.
a. LONG TERM
AND
a.
b.
C.
a. MAXIMUM DAILY VALUE
(ifavailable)
VALUE (ifavailable)
AVERAGE VALUE
CAS NUMBER
TESTING
BELIEVED
BELIEVED
d. NO. OF
a. CONCEN-
b. NO. OF
(1)
(1)
(1)
(1)
(ifavailable)
REQUIRED
PRESENT
ABSENT
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
ANALYSES
TRATION
b. MASS
CONCENTRATION
(2) MASS
ANALYSES
GC/MS FRACTION — BASE/NEUTRAL COMPOUNDS (continued)
43B. N-Nitro-
sodiphenylamine
All
Values
Est.
(86-30-6)
44B. Phenanthrene
(85-01-8)
45B. Pyrene
(129-00-0)
46B. 1,2,4-Tri-
chlorobenzene
X
(120-82-1)
GC/MS FRACTION — PESTICIDES
1P. Aldrin
�/
(309-00-2)
2P. a-BHC
(319-84-6)
3P. P-BHC
�/
(319-85-7)
x
4P. y-BHC
\/
x
(58-89-9)
5P. S-BHC
\/
(319-86-8)
x
6P. Chlordane
(57-74-9)
7P. 4,4'-DDT
\/
x
(50-29-3)
8P. 4,4'-DDE
\/
(72-55-9)
x
9P. 4,4'-DDD
\/
x
(72-54-8)
10P. Dieldrin
(60-57-1)
11P. a-Enosulfan
(115-29-7)
12P. R-Endosulfan
(115-29-7)
13P. Endosulfan
Sulfate
u
(1031-07-8)
14P. Endrin
(72-20-8)
15P. Endrin
Aldehyde
(7421-93-4)
16P. Heptachlor
(76-44-8)
EPA Form 3510-2C (8-90) PAGE V-8 CONTINUE ON PAGE V-9

EPA I.D. NUMBER (copyfromItem I of Form 1) OUTFALL NUMBER
CONTINUED FROM PAGE V-8 NC0000396 001
2. MARK "X"
3. EFFLUENT
4. UNITS
5. INTAKE (optional)
1. POLLUTANT
b. MAXIMUM 30 DAY VALUE
c. LONG TERM AVRG.
a. LONG TERM
AND
a.
b.
C.
a. MAXIMUM DAILY VALUE
(ifavailable)
VALUE (ifavailable)
AVERAGE VALUE
CAS NUMBER
TESTING
BELIEVED
BELIEVED
d. NO. OF
a. CONCEN-
b. NO. OF
(1)
(1)
(1)
(1)
(ifavailable)
REQUIRED
PRESENT
ABSENT
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
CONCENTRATION
(2) MASS
ANALYSES
TRATION
b. MASS
CONCENTRATION
(2) MASS
ANALYSES
GC/MS FRACTION — PESTICIDES (continued)
17P. Heptachlor
Epoxide
All
Values
Est.
(1024-57-3)
18P. PCB-1242
\/
x
(53469-21-9)
19P. PCB-1254
\/
(11097-69-1)
x
20P. PCB-1221
\/
(11104-28-2)
x
21P. PCB-1232
\�
(11141-16-5)
x
22P. PCB-1248
\�
(12672-29-6)
x
23P. PCB-1260
\�
(11096-82-5)
x
24P. PCB-1016
(12674-11-2)
25P.Toxaphene
(8001-35-2)
EPA Form 3510-2C (8-90) PAGE V-9

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
Attachment C
Form 2C Item I I —A
Line Drawing for Flows, Sources of Pollution and Treatment
Technologies

Current
French Broad
River
X
Make -Up
Water Intake
Lake N Intake
Julian Structure
U
Public
Water
Supply
Settling
Zone
Service Water
iese
Fire
X
T
Consumptive
Loss
Flue Gas
Desulfurization
Units 1 & 2
Circulating Water
to Heat Exchanger
Vendor supplied
water treatment
uomaustion
Turbine Site
Low Volume
Waste Sources
Groundwater
Extraction (Option B)
Potable and
Sanitary
System
Storm Water
L
Fire
Protection
System
'e7
Stermw
Stormwater flow has
been redirected
V
F
Ash Sump
Clarifier
S Lake Julian
Outfall 002
Preheater
Ash
Cleaning
Sluice
Water
Water
R
G
M
1964
E Ash Pond
(Duck Pond)
----------
Public
Sewer
System
a
J
Coal Pile
Runoff
Evaporati
in Boilei
L
Ultra -Filtration
System (future)
Public
Sewer
System
MSD
internal
l '
1 O
Chemical Metal
Cleaning Waste
(Alt.)
-----------J
------------------
Z
------ -------------
Rim Ditch & French Broad
Polishing Filter Secondary
Settling River
Basin n A Outfall001
(Future Flow) ;
�____� Temporary __
H Phys/Chem Groundwater Extraction
(Option A)
Dam Seepage
Evaporation
MSD

French Broad
River
Post plant shutdown (starting Nov 2019 to Jan 2020) (Option A)
Public Water
Sunnly
Lnll CIULI I I
French Broad
River
Outfall 001
Dam Seepage

1
2
Lake Julian
,
3
Unit 07/08 Raw
Water Supply 4
Existing Unit 3 and 4
Simple Cycle
�\ �
Simple Cade
Unit 3 and 4
Deminerailzed Water
CTG Water
Storage Tanks
Injection
Evaporation
Cycle
a4
FWand
sh
Transfer Truck
Water Treatment
Building Sump
30
36 33 sludge
Unit 07/08 Thickener
Sludge Thickener
37 Nif34
Unit 07/08 Filter Press
Sludge Thickener (shared)
29 Transfer Truck
Combined Cycle and Existing Simple Cycles
g
10
16
25
Ultrafiltration
Service Water/Fire Water
Service Water
Equipment Drains
Tank
Users
Sump
17
Simple Cycle
>1Existing
Evap Cooling & Makeup
38
p
38
Standby RO/Demin
Trailers
12_7
9
1 5
1$
13
Two-Pass Reverse Osmosis
Mixed -Bed
Demineralized
Deminemlizer
Water Tanks
CTG NOx Injection
6
Atmnsphere
14
20
A
Atmosphere
22
19
11
21
HRSG Blowdown
HRS6
Cooling Tower & Basin
Tank/Sump
24
TG Wash
24
[cater
Transfer Truck
35
23
Sample Panel
19
27
31
Unit 07/08 39
32
Cooling Tower
Unit 07/08
Blowdown
Oil -Water Separator
O01C
001E
Side -Stream
Filters
Unit 05/06 Oil -Water
Separator
O01D
25
Secondary
Waste Water Sump
Settling
French Broad River Outfall
Unit 05/06 Cooling
Tower Blowdown
(Shared)
ItS 26
Basin
001
001A
Existing Plant Rim
Existing Fuel Oil Area Oil
Existing Fuel Oil Area
Ditch and Polishing
water Separator
Storm Water
Filter

Duke Energy Progress, Inc.
Asheville Steam Electric Plant — NPDES Permit Number NC0000396
Attachment C - Current Outfall 001
Form 2C - Item II -A Flow, Sources of Pollution, and Treatment Technologies
Stream
Name
Average Flow
Comments
A
Ash Pond/Rim Ditch Discharge
3.52 MGD
Outfall 001
B
Intake to Once -through Cooling & Circulating
Water to Heat Exchangers
255.1 MGD
C
Plant Potable and Sanitary Uses
0.002 MGD
From POTW
D
Makeup to Lake from River
2.68 MGD
2009 Average
E
Low Volume Wastes
• Ash Hopper Seals
• Sandbed Filter Backwash
• Boiler Blowdown
• Truck Wash
• Water purification process waste streams
0.05 MGD
2600 Gal/event
0.006 MGD
Variable
variable
Rare Usage
Startup - Estimated
F
Circulating Water from Heat Exchangers
19.3 MGD
Estimated
G
Ash Sluice Water
3.03 MGD
Estimated
H
Dam Seepage
— 0.09 MGD
Calculated
I
City Water Supply to Boiler Makeup
0 MGD
Rare Usage
J
Coal Pile Runoff
0.01 MGD
Based on Average Annual
Rainfall of 47" and 50 % Runoff
K
Storm Water
0.07 MGD
Estimated
L
Chemical Metal Cleaning Wastes
0 - 90,000 Gallons
(0 gallons anticipated)
Normal Practice is Evaporation
M
Water From Combustion Turbine Facility
Operation (Blade wash activities)
0 - 0.02 MGD
Intermittent
N
From Lake to Intake
256.59 MGD
Estimated
O
Intake to Service Water
0.05 MGD
Estimated
Q
Fire Protection Water
0.010 MGD
Estimated
R
Air Preheater Cleaning
10,000 gallons/event
Estimated
S
Discharge to Lake Julian
255.1 MGD
T
Emergency Fire Protection Water
0
Used for fire fighting
Outfall 002 -Calculated
U
Diesel Fire Pump to Lake Julian
0.128 MG/week
Estimate - pump testing
V
Flue Gas Desulfurization Blowdown
0.086 MGD
Calculated
X
Intake to FGD system
01.08 MGD
Y
Chloride Dilution Water (Lake water)
0.35 MGD
z
FGD treatment system
0.376 MGD
Outfall 005
AA
Makeup water supply
22 Million gallons/year
Calculated
Attachment C - form 2C - Item IIA Flows, Sources of
Pollution, and Treatment Technologies
Duke Energy Progress , Inc.
Asheville Steam Electric Plant
November 2018

Duke Energy Progress, Inc.
Asheville Steam Electric Plant — NPDES Permit Number NC0000396
Outfall 001 - Post Asheville Coal Fired Plant Closure (Anticipated
November 2019)
Form 2C - Item II -A Flow, Sources of Pollution, and Treatment Technologies
Stream
Name
Average Flow
Comments
C
Plant Potable and Sanitary Uses
0.002 MGD
From POTW
D
Makeup to Lake from River
2.68 MGD
2009 Average
E
Low Volume Wastes
• Ash Hopper Seals
• Sandbed Filter Backwash
• Boiler Blowdown
• Truck Wash
• Water purification process waste streams
0.05 MGD
2600 Gal/event
0.006 MGD
Variable
variable
Rare Usage
Startup - Estimated
H
Dam Seepage
— 0.09 MGD
Calculated
J
Coal Pile Runoff
0.01 MGD
Based on Average Annual
Rainfall of 47" and 50 % Runoff
K
Storm Water
0.07 MGD
Estimated
N
From Lake to Intake
256.59 MGD
Estimated
O
Intake to Service Water
0.05 MGD
Estimated
Q
Fire Protection Water
0.010 MGD
Estimated
U
Diesel Fire Pump to Lake Julian
0.128 MG/week
Estimate - pump testing
BB
Contact SW and Interstitial Water
0.360 - 0.532
Estimated
DD
Onsite Physical/Chemical WTS
0.360 - 0.532
Estimated
EE
Lined Retention Pond
0.653
Estimated
FF
Segregated Clean SW
0.0 - 0.172
Estimated
GG
Combined Onsite WTS
1.02 - 1.19
Estimated
Attachment C - form 2C - Item IIA Flows, Sources of Pollution,
and Treatment Technologies
Duke Energy Progress , Inc.
Asheville Steam Electric Plant
November 2018

Duke Energy Progress, Inc.
Asheville Steam Electric Plant — NPDES Permit Number NC0000396
Outfall 001 — Combined Cycle (Anticipated January 2020)*
Form 2C - Item II -A Flow, Sources of Pollution, and Treatment Technologies
Stream
Name
Average Flow
Comments
1
Total Facility Raw Water Supply
2,816
Estimated
2
RW to Unit 05/06
1,408
Estimated
3
RW to Unit 07/08
1,408
Estimated
4
Cooling Tower Makeup
1,126
Estimated
5
Cooling Tower Blowdown
235
Estimated
6
Cooling Tower Evaporation and Drift
940
Estimated
7
Raw Water to Ultrafiltration Inlet
282
Estimated
8
Raw Water to Service Water Tank
267
Estimated
9
Ultrafiltration Reject & Strainer Backwash
15
Estimated
10
Service Water to Users
50
Estimated
11
Condenser Circ Water Quench Water to Boiler
Blowdown Tank
4
Estimated
12
Service Water to Two -Pass Reverse Osmosis
Skids
103
Estimated
13
Reverse Osmosis Permeate to Mixed Bed
Demineralizer
75
Estimated
14
Reverse Osmosis Reject
28
Estimated
15
Demineralized Water System Makeup
75
Estimated
16
Service Water Users to Oil Water Separator
50
Estimated
17
Service Water to Unit 3 & 4 Evap Cooling &
Cycle Makeup
0
Estimated
18
CTG NOx Injection Water
177
Estimated
19
CTG Wash Water
1
Estimated
20
Boiler Makeup
11
Estimated
21
Boiler Blowdown
5
Estimated
22
Boiler Blowdown Tank Evaporation & Losses
2
Estimated
23
Quenched Boiler Blowdown Sump Flow
13
Estimated
24
Sample Panel Flow
6
Estimated
25
Oil Water Separator Discharge Flow
50
Estimated
*These flows will continue to combine with Plant closure flows until approximately 2023
Attachment C - form 2C - Item IIA Flows, Sources of Pollution, and
Treatment Technologies
Duke Energy Progress , Inc.
Asheville Steam Electric Plant
November 2018

Duke Energy Progress, Inc.
Asheville Steam Electric Plant — NPDES Permit Number NC0000396
Stream
Name
Average Flow
Comments
26
Total Facility Waste Water to Plant Discharge
569
Estimated
27
Side -Stream Filter Flow
1,912
Estimated
28
Side -Stream Filter Backwash Flow
17
Estimated
29
Sludge to Transfer Truck
6
Estimated
30
Sludge Thickener Overflow
14
Estimated
31
Side -Stream Filtrate
1,660
Estimated
32
Unit 07/08 Waste Water Flow
50
Estimated
33
Sludge Thickener Underflow
4
Estimated
34
Filter Press Supernatant
1
Estimated
35
Water Treatment Building Sump Flow
29
Estimated
36
Unit 07/08 Sludge Thickener Underflow
4
Estimated
37
Unit 07/08 Sludge Filter Press Supernatant
1
Estimated
38
Standby Demin Trailer Flow
114
Estimated
39
Unit 07/08 Cooling Tower Blowdown
235
Estimated
*These flows will continue to combine with Plant closure flows until approximately 2023
Attachment C - form 2C - Item IIA Flows, Sources of Pollution, and
Treatment Technologies
Duke Energy Progress , Inc.
Asheville Steam Electric Plant
November 2018

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
Attachment D
Form 2C Item II — B
Descriptions of Flows, Sources of Pollution and Treatment Technologies

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
Attachment D
Form 2C — Item II-B Flow, Sources of Pollution, and Treatment Technologies
The Asheville Steam generating facility, located in Skyland, North Carolina, currently consists of two coal
fired units (Units 1 and 2) with a combined summer/winter capacity rating of 378 megawatts (MW)/384
MW (operations will cease by January 30, 2020 per Section 2 of the Mountain Energy Act). The facility
also has two combustion turbines (Units 3 and 4) with a combined summer/winter capacity rating of 320
MW/370 MW and two new combined -cycle power blocks (PB) (PB 1 - Units 5 and 6, PB-2 Units 7 and
8) with a combined summer/winter capacity rating of 500 MW/560 MW. Functional testing is scheduled
to begin in March 2019 and the commercial operation date is currently scheduled for November 2019.
Water is withdrawn from Lake Julian, as needed, for service water/fire protection water and the cooling
tower make-up water. Chemical constituents contained in the discharge from the permitted outfall will, in
part, be representative of the naturally -occurring concentrations of constituents in the intake water and
concentrations of constituents characteristic of similar discharges for fossil generating facilities of this
size, type, and in this geographical location.
The Asheville Plant currently has two external permitted outfalls, one to French Broad River (Outfall
001), which receives all combined wastewaters and one to Lake Julian (outfall 002) for cooling water
blowdown
Outfall 001 Current Condition
The 1964 Ash Basin Dam (BUNCO-097) was constructed in 1964 to serve as a wastewater treatment
facility for the treatment of ash sluice water. The surface area of the basin is approximately 45 acres. The
basin does not retain a permanent pool with the exception of a three -acre unlined retention pond known as
the open water area.
All ash is expected to be removed completely from the 1964 ash basin by applicable regulatory deadlines.
The Plant's remaining ash basin (hereinafter referred to as the 1964 ash basin), is located east of the French
Broad River, south of the plant and discharges into the French Broad River. With the approval of the North
Carolina Department of Environmental Quality (NC DEQ), Duke relocated treated waters from the former
1982 ash basin and lined rim ditch to a downstream outfall location (Outfall 001) on the French Broad
River. The relocation of Outfall 001 was necessary to allow for enhancement to the dam of the 1964 ash
basin to meet current engineering standards. Production ash is sluiced to a concrete rim ditch system that
is located within the footprint of the 1964 Ash Basin. The rim ditch system also receives plant stormwater
drainage and low volume wastewater. CCR are dredged from the rim ditch, dewatered, and transported
off -site.
Historically, the wastewater from the rim ditch process was treated in the lined rim ditch system, then routed
to the open water area, and decanted to a settling pond outside of the 1964 Ash Basin. The settling pond
serves as the monitoring point for Outfall 001 of the Plant's NPDES permit. Water discharge from this
settling pond is routed directly to the French Broad River through the permitted outfall.

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
During 2016, wastewater flows and treatment were adjusted to facilitate the excavation of the 1982 Ash
Basin. The center pond filters were constructed at the end of the rim ditch and commissioned to replace
the treatment provided by the open water area. Infrastructure was developed to dewater the open water area
to the head of the rim ditch, and subsequently, the low volume waste and stormwater that flowed into the
1982 Ash Basin and pumped to the rim ditch was re-routed to the open water area.
The ash basin and/or rim ditch provides treatment by sedimentation and neutralization to the plant's waste
streams. Water leaves the rim ditch via weirs and curtains to the lined center pond where a skimmer pulls
water into 1 of 4 filter trains and flows via either the 1964 ash pond or direct discharge to a lined stilling
pond, where the discharge is treated by an automated pH system, where it is then discharged by overflow
to a pipe that coveys it to the French Broad River. Toe drains from the 1964 basin are currently collected
and pumped to the rim ditch and flow through the treatment system to outfall 001 and the French Broad
River.
Flue Gas Desulfurization Blowdown (Low Volume Waste)
This system is currently discharging to the Metropolitan Sewerage District (MSD) from the waste water
treatment building. The Flue Gas Desulfurization (FGD) system directs flue gas into an absorber where a
limestone (calcium carbonate) slurry is sprayed. Sulfur dioxide in the flue gas reacts with the limestone to
produce calcium sulfate (gypsum). This system reclaims any unreacted limestone slurry to be reused in the
absorber. A small blowdown stream is used to maintain the chloride concentration in the reaction tank.
The blowdown stream is passed through a clarifier to remove solids and reduce the chloride concentration
in the waste stream. Chemicals are used to adjust pH and to aid solids removal in the clarifier. The waste
stream enters a weir box and is discharged into a connection to MSD.
1964 Ash Basin Pre -closure Wastewater
Duke Energy is in the process of excavating ash from the 1964 ash basin which will continue through plant
retirement no later than January 31, 2020 and subsequent closure. It is anticipated that interstitial water will
be encountered early in the process as portions of the 1964 ash basin are being excavated. Duke Energy
plans to place the interstitial water discovered within the 1964 basin into the Rim Ditch and treat as
necessary to ensure compliance with permit limits prior to discharging through Outfall 001. It is Duke
Energy's understanding that this activity is permitted under North Carolina's NPDES wastewater permit
program, because the contents of this basin is regulated as a wastewater until leaving the treatment basin
for disposal or beneficial use. Prior to moving the wastewater into the rim ditch, Duke will assure that (i)
all NPDES permit terms and conditions are being met; and (ii) any necessary dam safety approvals are
secured and that the work is being done in accordance with applicable dam safety guidelines and
requirements.
Outfall 001- Post Asheville Coal Fired Plant Closure (Anticipated November 2019)
This modification details below are proposed changes that will be implemented to accomplish dewatering
and ultimately closure of the 1964 ash basin.
The 1964 Ash Basin is currently void of free-standing water, except for the small open water area (described
above). Stormwater and wastewater flows into the open water area are captured and pumped to the head
of the rim ditch wastewater treatment system within the footprint of the 1964 Ash Basin.
Page 2 of 4
2018 Asheville Combined Cycle
Permit Application

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
As noted above, the settling treatment provided by the open water area was replaced by a filtration
system. The filtration system meets existing permit requirements as it relates to the treatment previously
provided by the open water area. The treated wastewater continues to flow to the permitted NPDES Outfall
001. The open water area is used for retention of the 1964 Basin and the low volume stormwater and
wastewater flows.
Contact and interstitial water from the 1964 Ash Basin excavation will also be pumped to the rim ditch
wastewater treatment system, including filtration until station retirement and demolition of the rim ditch.
Cleaning and commissioning of the HRSG will generate large amounts of liquid waste that will be stored
in an on -site "lake tank" for removal and disposal off -site. The primary operations will be chemical clean
of the HRSG, which uses Citric Acid to remove contaminants from the internal piping and components,
and hydrolasing of the pipe, which uses high pressure water jets to clean weld slag and mill scale from the
interior of the piping. All of the waste from these operations must be contained for off -site disposal.
The installation of two fully redundant treatment trains. Each treatment train would treat 400 to 500 gpm
flows, removing suspended solids and associated metals. One treatment train could be eliminated in the
future once LVWS is eliminated by demolition, which is tentatively scheduled for August 2021. This will
also include a lined settling basin (side hill basin) to segregate the LVWS that is a non-CCR waste stream
from the 1964 basin. This process may also require a tank by the treatment plant to equalize interstitial
water.
Outfall 001— Fully operational Combined Cycle (Anticipated January 2020) & Discussion of Proposed
Internal Outfalls
This modification details below are proposed changes that will be implemented after the full
decommissioning of the coal units that is anticipated to be in January 2020. The overall water treatment
flows and streams of wastewater that that will contribute to Outfall 001 are described below. This section
includes the discussion of new requested internal outfalls that will ultimately be discharged to the
wastewater sump.
Raw water is put through an ultrafiltration (UF) process before being stored in the service water tanks. The
OF backwash is collected in a sump and then pumped into the cooling tower basin for re -use in the
condenser circulating water system. Some of this water will be present in the cooling tower blowdown.
Demineralized water for HRSG makeup and CTG fuel oil operation is put through a Reverse Osmosis (RO)
process, which has a reject flow that is collected in the OF backwash sump and then pumped into the cooling
tower basin. Both the OF and RO share a common clean -in -place (CIP) system. The chemical solution
waste from the CIP system is discharged to the Neutralization tank. Neutralization waste is discharged in
the OF backwash sump and then pumped to the cooling tower basin.
The cooling towers dissipate waste heat through evaporation and the concentration of dissolved solids is
controlled via blowdown to the common wastewater collection sump. The cooling towers will be treated
with dispersant, corrosion inhibitor, and sodium hypochlorite. Each cooling tower utilizes side stream filters
to limit the accumulation of solids in the basin. Cooling tower blowdown is treated with sodium bisulfite
for residual chlorine removal. HRSG Blowdown is routed to the cooling tower for re -use in the condenser
circulating water system. This water will be part of the cooling tower blowdown, which is routed to the
Page 3 of 4
2018 Asheville Combined Cycle
Permit Application

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
wastewater collection sump via the Internal Outfalls. The cooling tower units 05/06 blowdown that is
discharged to the wastewater sump is proposed Internal Outfall 001A and cooling tower units 08/07
blowdown is proposed Internal Outfall 001C.
Various plant equipment, including fuel oil storage tanks, transformers, etc., requires containment areas for
spills. Storm water collected in these areas is visually inspected for the presence of oil and is either released
through the storm drains system or routed through the plant drains to an oil water separator. The discharge
from the oil water separators is sent to the proposed Internal Outfall 001D described below.
Each combined cycle power block has an oil water separator to trap oil before discharging to the wastewater
collection sump. Potentially oily waste is collected from equipment and area drains in the two turbine
building sumps and pumped through their respective oil water separator to the wastewater collection sump.
The oil -water separator connected to Unit 07/08 is proposed Internal Outfall 001B and the oil -water
separator connected to unit 05/06 is proposed Internal Outfall 001D. See Attachment E for the effluent
characters of all proposed internal outfalls.
Sanitary wastes are drained to an on -site lift station and pumped into the Buncombe County MSD manhole
on -site.
The wastewater collection sump that all Proposed Internal Outfalls discharge into will discharge to the
existing manhole north of the simple cycle treatment manhole #1, and then to outfall 001.
The ash basin and/or rim ditch provides treatment by sedimentation and neutralization to the plant's waste
streams. This waste stream will flow into the secondary settling basin which then discharges into Outfall
001.
Removal of Outfall 004 & 005
After the full decommissioning of the coal units that is anticipated in January 2020 and the complete
conversion to the Combined Cycle Plant configuration Internal Outfalls 004 & 005 will no longer be
needed. Currently Internal Outfall 004 discharges wastes from chemical metal cleaning treatment system.
Once the combine cycle units are operational a chemical metal cleaning treatment system will no longer be
needed. Internal Outfall 005, previously discharges wastewaters from the Flue Gas Desulfurization
(FGD) wet scrubber treatment system which also is not part of the combined cycle operational process and
should be removed.
Page 4 of 4
2018 Asheville Combined Cycle
Permit Application

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
Attachment E
Thermal Mixing Zone Report

Outfall 001 Thermal Mixing Zone
Duke Energy - Asheville Energy Plant
Prepared for:
Duke Energy - Asheville Energy Plant
NPDES Permit #NC0000396
Arden, North Carolina
October 23, 2018
Prepared by:
Water Environment Consultants
Mount Pleasant, South Carolina
i
-low =� —

Outfall 001 Thermal Mixing Zone Report
Table of Contents
ExecutiveSummary...................................................................................................................................... iii
1 Introduction..........................................................................................................................................
1
2 NPDES Outfall 001.................................................................................................................................3
2.1 Outfall 001 Flow Rate....................................................................................................................3
2.2 Outfall 001 Recommended Discharge Temperatures...................................................................3
2.3 Outfall 001 Discharge Width and Depth.......................................................................................3
3 Ambient Conditions..............................................................................................................................5
3.1 French Broad River Physical Characteristics.................................................................................5
3.2 Field Data Collection..................................................................................................................... 5
3.3 Field Data Adjustments to 7Q10 Conditions................................................................................. 6
3.4 River Cross -Section for CORMIX Model......................................................................................10
3.5 Ambient Temperatures...............................................................................................................13
4 CORMIX Modeling Summary...............................................................................................................15
4.1 Model Inputs...............................................................................................................................15
4.2 Outfall 001 Mixing Zone Results.................................................................................................15
Appendix A. CORMIX Session and Prediction Files................................................................................
A-1
Appendix B. CORMIX CorView Graphics.................................................................................................B-1

List of Figures
Figure1-1.
Site Location Map...................................................................................................................... 2
Figure 2-1.
Photograph of Outfall 001 discharge structure (river flowing right to left) ..............................4
Figure 2-2.
Photograph of Outfall 001 entering the river (river flowing left to right).................................4
Figure 3-1.
Panoramic photograph of French Broad River at Outfall 001 (river flowing left to right) ........6
Figure 3-2.
Measured water depths.............................................................................................................7
Figure 3-3.
Triangulation contours of water depths....................................................................................8
Figure 3-4.
Measured current velocities......................................................................................................9
Figure 3-5.
USGS Station #03451500 gage height versus flow plot, and table showing estimated
difference in height for 7Q10 conditions based on the best -fit relationship ..........................11
Figure 3-6.
Triangulation contours of water depths lowered by 0.9 feet (flow path shown) ...................12
Figure 3-7.
Average downstream river transect (0.9-foot 7Q10 delta included)......................................13
Figure 4-1.
CORMIX Model Prediction — Approximate Downstream Distance at 5.04°F Excess
(GoogleMaps)...........................................................................................................................17
List of Tables
Table 3-1. French Broad River Temperature Analysis, Jan. 2015 - July 2018 (USGS Station 03451500)....13
Table 4-1. CORMIX Model Inputs Table......................................................................................................16

Executive Summary
Duke Energy's (Duke's) Asheville Energy Plant (Asheville) located in Skyland, North Carolina discharges
wastewater to the French Broad River under an NPDES permit issued by the North Carolina Department
of Environmental Quality (NCDEQ). That permit, which is currently being renewed by NCDEQ, sets end -
of -pipe limits on Outfall 001 prior to discharge, but those limits do not include temperature limits. Duke
is constructing a combined cycle generating plant, and once it becomes operational (projected startup
December 31, 2019), the discharge of heated wastewaters must be permitted to ensure compliance
with the instream water quality standards. Duke committed to perform a thermal mixing zone study,
and the results can be used to request effluent temperature limits.
The mixing zone study included both field data collection and Cornell Mixing Zone Expert System
(CORMIX) modeling of the discharge plume. After an unusually wet summer, instream bathymetry and
velocity data were collected on August 28, 2018, and that data was incorporated into the model after
extrapolating the data down to the 7Q10 low -flow conditions. A CORMIX (Version 11.0) model was
developed that predicts that even under conservative conditions, the resulting thermal mixing zone will
be relatively small. The model predicts that for December through February (winter months) and March
through November, at permitted temperatures of 73.0°F and 89.0°F respectively, the 2.8°C (5.04°F)
"rise -above -background" and 29°C (84.2°F) maximum instream standards will be met at a distance less
than 40.5 meters (approximately 133 feet) downstream of the outfall. Because the temperature excess
is significantly greater in the winter months, the winter thermal mixing zone will be significantly larger
than during the remainder of the year. Therefore, only the winter model case is included. The model
also predicts that the winter plume width will be no wider than 7.5 meters (approximately 25 feet)
across the stream, thereby allowing safe passage of organisms around the plume.
Based on the results of the conservative model included within this report, Water Environment
Consultants (WEC) recommends that the reissued NPDES permit include ONLY the 73.0°F winter
(December through February) and 89.0°F (remaining months) daily maximum permit limitations, to be
monitored by weekly grab sampling. Because actual discharge temperatures will be less than the
maximum permit limits, the actual instream plume will be smaller than the conservative model
prediction results. Therefore, there is no need for Duke to bear the expense of complying with
upstream and downstream temperature monitoring/limitations. Performing an instream study after the
combined cycle plant is operating to verify that the model predictions are conservative is a reasonable
permit condition. However, if an instream study is completed, the study should recognize that the
measured conditions will not be at the conservative modeled conditions, and it should not be performed
with the intent to calibrate the CORMIX model.
r v L

1 Introduction
Duke Energy Corporation (Duke) contracted Water Environment Consultants (WEC) to complete a
mixing zone study in support of their permit application for Duke's Asheville Energy Plant (Asheville).
Asheville is located at 200 CP&L Drive, Arden, North Carolina, and it discharges wastewater to the
French Broad River under NPDES Permit No. NC0000396. The French Broad River originates in
Transylvania County, North Carolina and flows for 210 miles through western North Carolina northward
into Tennessee. The river basin is 2,830 square miles, and as the river flows north towards Asheville
along Interstate 26 just past the Asheville Regional Airport, it passes the Asheville Energy Plant.
Asheville Energy Plant is located immediately adjacent to the French Broad River near Skyland, North
Carolina, and there are currently two primary NPDES outfalls. Outfall 001, the primary process
wastewater outfall discharges directly to the French Broad River as shown in Figure 1-1. Outfall 002
discharges once -through cooling water directly to Lake Julian, and thermal modeling of Outfall 002 is not
part of this modeling report.
Outfall 001 currently includes multiple process wastewater streams, but many wastewater streams will
be eliminated with closure of the coal-fired generating facility. New wastewater streams will be
introduced as part of the combined cycle generating facility currently under construction. The North
Carolina Department of Environmental Quality (NCDEQ) has not reissued Asheville's NPDES permit, but
it will have to do so to include temperature limits so the thermal wastewater streams from the
combined cycle plant can be discharged through Outfall 001.

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Figure 1-1. Site Location Map
2

2 NPDES Outfall 001
The purpose of this report is to request the addition of Outfall 001 temperature limits under future
operating scenarios that will allow the discharge of heated wastewaters generated from the combined
cycle plant. Outfall 001 currently includes all plant process wastewater streams (Outfall 002 is a cooling
water discharge), and it discharges into the French Broad River as shown in Figure 2-1. Once the coal-
fired plant is no longer operational and the on -site ash ponds have been closed, generation will be from
the future combined cycle plant, and the Outfall 001 discharge will consist of wastewaters primarily
from that operation.
2.1 Outfall 001 Flow Rate
Once the coal-fired operations and ash pond closures have been completed, the primary plant
wastewater streams will come from the combined cycle plant. Several of the wastewater streams will
be continuous, while several will be intermittent, including pumped flows that start and stop throughout
the day. NPDES permit limitations and the size of the instream mixing zones are typically based on long-
term daily average discharge flow rates. Duke and their contracted design engineer (McDermott
International, Inc. [McDermott]) calculated worst -case, 24-hour daily average discharge flow rates and
temperatures under four combined cycle operating scenarios. The two cases of interest for this
permitting and modeling project are the full load summer and winter operating scenarios. The
calculations performed were for Unit 5/6 and Unit 7/8 operating at full load during each season, and the
calculated 24-hour average flow rates were 1,795 gallons per minute (gpm) and 837 gpm, respectively.
As discussed in the following sections of this report, only the winter design case was modeled for this
project.
2.2 Outfall 001 Recommended Discharge Temperatures
McDermott calculated 24-hour average temperatures of 85.9°F (maximum) and 70.0°F (worst -case
December through February) cases. To account for potentially warmer days than those used by
McDermott, and to account for a grab sample -based, permit limitations (grab samples will exhibit a
greater degree of variability than 24-hour average values, and therefore may be higher than the 24-hour
averages calculated by McDermott), approximately 3°F were added to these values to set the maximum
recommended discharge temperature limitations. Permit limitations of 89.07 (maximum) and 73.07
(maximum for December through February) were used as the discharge permit temperatures evaluated
for the model study.
2.3 Outfall 001 Discharge Width and Depth
The photograph in Figure 2-1 shows Outfall 001 discharging through a 10-foot wide flume. The flume
headwall leads to a rip rap embankment where the discharge enters the river. As the discharge flows
down through the rip rap, the water slows and spreads to an approximate 20-foot width (Figure 2-2).
Based on spatial restrictions within the model, it is assumed that the discharge will traverse the bank
and enter the French Broad River at a 20-foot channel width and one foot of depth.

3 Ambient Conditions
The Upper French Broad River sub -basin, which is part of hydrologic unit code 06010105, encompasses
1,658 square miles from its headwaters in western Transylvania County to the Tennessee -North Carolina
state line. Major tributaries to the French Broad River include: Big Laurel Creek, Cane Creek, Davidson
River, Hominy Creek, Little River, Mills River, Mud Creek, Sandymush Creek, Spring Creek, and
Swannanoa River. Three small lakes exist within the watershed, but none are on the French Broad River;
therefore, the river flows are not buffered by reservoirs and are a direct result of rain events within the
watershed and the time of travel of the various tributaries and the river. Similarly, water temperatures
are solely a function of the ambient temperature and not affected by equalization within a large lake or
discharges from the bottom of a lake (e.g., hydroelectric generation). The French Broad River is used
extensively for primary and secondary recreational purposes.
3.1 French Broad River Physical Characteristics
Outfall 001 discharges into the French Broad River within the Avery Creek - French Broad River
Subwatershed (060101050704) of the Cane Creek - French Broad River Watershed (0601010507). The
river in this area is characterized by relatively gentle slopes, sandy bottom, and intermittent rock shoals.
The French Broad River at Outfall 001 is a wide, gently sloping, rocky bottomed river with slight
elevation drops at rock shoals (refer to Figure 3-1). Sand and silt fill the rock voids, primarily in the
deeper pools and quiescent zones. The river is 230 to 250 feet wide downstream of Outfall 001. There
are several sets of rock shoals above and below Outfall 001, and the river current patterns meander
back and forth across the stream.
3.2 Field Data Collection
North Carolina's July 23, 1999, mixing zone guidance document states:
In order to ensure that adequate data are available to support the modeling effort, the Division
requires that site -specific flow and velocity estimates be developed and that model inputs be
based upon a cross-section of the receiving waterbody at the discharge site or comparable data on
site morphometry.
Bathymetry and current measurements were collected to support the model study. Bathymetry data is
required in order to create a river cross-section for the Cornell Mixing Zone Expert System (CORMIX)
(Version 11.0) model. Current velocity measurements were also collected in order to verify that the
model reasonably represents the hydrodynamics within the proposed mixing zone.
Field data was collected on August 28, 2018, to support the mixing zone analysis for Outfall 001. A
Sontek M9 Acoustic Doppler Current Profiler (ADCP) was used to collect both water depth and current
velocity data. The Sontek M9 is equipped with a differential GPS to provide horizontal positioning data.
The measured depths are shown in Figure 3-2, and Figure 3-3 includes a graphical representation of the
triangulated depth data. The aerial images in these figures are 2015 NC One Map Aerial Imagery from
the NC Center for Geographic Information and Analysis.
Ar w 7

Figure 3-1. Panoramic photograph of French Broad River at Outfall 001 (river flowing left to right)
The depth -averaged, measured current velocities are shown in Figure 3-4. Measurements across several
transects were used to calculate the instantaneous river flow rate. The average flow rate measured at
these transects was ±1,200 cubic feet per second (cfs), which compares favorably with data retrieved
from USGS Gaging Station #03451500 (https://waterdata.usgs.gov/nwis/uv?03451500) which is
approximately 4.5 river miles downstream of Outfall 001. The average USGS flow during the field study
duration, retrieved based on a two-hour delay due to travel time, was 1,400 cfs.
During the field measurements, most of the rock shoals were submerged, some just slightly, and at
lower (e.g., 7Q10) river flows, many shoals would be exposed, such as those located between the final
two transects shown on Figure 3-2. These shoals, along with deeper pools, help direct the primary flow
path across the river and back within the measured area (refer to the current directions Figure 3-4). The
rock shoals and meandering current were used to define certain CORMIX model inputs as described in
more detail later in this report.
3.3 Field Data Adjustments to 7Q10 Conditions
North Carolina's July 23, 1999, mixing zone guidance document also states:
Models are run using conservative estimates of critical conditions. Critical conditions for streams
are typically defined by the velocity and cross -sectional area associated with the 7Q10 flow.
In order to satisfy this requirement, the measured river depths were reduced to 7Q10 conditions, and to
be conservative, the summer, versus a higher winter, 7Q10 flow of 304 cfs from the July 1, 2005, NPDES
permit fact sheet was used.
Data from the previously referenced USGS Station (located at Pearson Bridge Road; 35°36'32"N,
82°34'41"W) was utilized to determine the depth adjustments. A best -fit line of the USGS river flow
versus gage height (river depth) data was used to estimate the relationship between river flow and

Figure 3-3. Triangulation contours of water depths
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water level, which was then used to calculate the adjustment to river depth at 7Q10 conditions (Figure
3-5). Figure 3-5 shows the best fit to measured flows and heights rated by the USGS as "good" or
"excellent" (measurements rated "fair" or "poor" were excluded).
The difference between the river depth at 7Q10 conditions (304 cfs) and on the August 28, 2018, field
measurement day (1,200 cfs) was calculated to be 0.9 feet. Based on similar river slopes, widths, and
bottom roughness at the USGS and Outfall 001 locations, the river depths were reduced by 0.9 feet
(refer to Figure 3-6).
The CORMIX model requires a representative input river cross-section. Therefore, a representative river
cross-section was prepared based on five cross -sections extracted from the measured river depth
contours. Extracted cross -sections extended downstream to a distance of 400 feet to conservatively
include the Outfall 001 discharge plume. Five transects spaced 100 feet apart extending from Outfall
001 to 400 feet downstream were extracted and then averaged in order to represent the average
conditions in this reach of the river (Figure 3-7).
3.4 River Cross -Section for CORMIX Model
The CORMIX model utilizes a rectangular cross-section as the ambient river width and depth. The
velocity of the water that passes through that cross -sectional "box" is an important model input
affecting instream mixing. With a set river flow (i.e., 7Q10), a smaller cross-section, due to less depth or
width, increases the model ambient velocity. At lower ambient river velocities, the plume momentum
may dominate the mixing characteristics, allowing the plume to cross the river allowing mixing with the
full river width. Higher ambient river velocities may provide more intense initial mixing, but it also
forces the plume rapidly downstream. The ambient velocity can also affect bank attachment, which
causes decreased mixing as the plume moves downstream.
While current velocities were measured, the CORMIX model does not allow for spatially varying
velocities across the stream cross-section. If the current data indicated that the majority of the stream
flow was on one side of the river, it would be appropriate to skew the model box to one side (i.e., less
cross -sectional width). In this case, the predominant current path during 7Q10 conditions will travel
back -and -forth across the river within the 400-foot area of interest (refer to Figure 3-6). While the
current information was not utilized to skew the model box to one side or the other, the meandering
currents, along with the rocky shoals, were utilized to determine the channel appearance and roughness
for the model.
With a uniform, yet undetermined, velocity throughout the cross-section, and the flow through that
cross-section being the 304 cfs 7Q10 flow, the last step is to set the model box dimensions. Therefore, a
model cross-section was best fit within the average of the five, lowered (to 7Q10 conditions) transects
mentioned previously as shown in Figure 3-7. The resulting model "box" is 220 feet wide by 2.3 feet
deep.

12 -
USGS Flow vs. Depth: y = 0.013xo.6648
10
-------------------------------
Flow (cfs) Height (ft) Condition
8
304 0.6 7Q10
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r
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-------------------------------
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1 10 100
1000 10000
Flow rate (cfs)
100000
Figure 3-5. USGS Station #03451500 gage height versus flow plot, and table showing estimated
difference in height for 7Q10 conditions based on the best -fit relationship

DEEP A:�EA
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PREDOMINANT FLOW PATH �
DURING LOW FLOW
CONDITIONS
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Figure 3-6. Triangulation contours of water depths lowered by 0.9 feet (flow path shown)
■ 12
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Figure 3-7. Average downstream river transect (0.9-foot 7Q10 delta included)
3.5 Ambient Temperatures
USGS Gaging Station #03451500 (https://waterdata.usgs.gov/nwis/uv?03451500) is approximately 4.5
river miles downstream of Outfall 001, and data from this station was utilized to determine the
appropriate model input for the ambient river temperature. Calculations performed on USGS
temperature data from January 1, 2015, through July 10, 2018 are provided in Table 3-1.
Table 3-1. French Broad River Temperature Analysis, Jan. 2015 - July 2018 (USGS Station 03451500)
Temperature
Percentile ("F)
5th
38.3
25th
48.9
50th
59.7
75th
70.7
95th
77.2
The purpose of the model study is to estimate the mixing of the effluent in the French Broad River and
determine the downstream temperature under conservative model conditions. The goal is to meet the
84.2°F maximum and 5.04°F "delta-T" instream temperature standards (mountain and upper piedmont
waters, 15A NCAC 02B.0211, Item 18) within a relatively short distance downstream, and the model
13

predictions estimate the distance downstream that the effluent has been reduced to below 84.2°F and
also to below 5.04°F above natural background.
The CORMIX modeling was limited to conditions that create a conservative, large temperature plume.
CORMIX predicts thermal plumes as the excess temperature above ambient, and except in very large,
hot plumes, it is a function of mixing versus heat loss. Therefore, the greater the excess temperature,
the larger the thermal plume/mixing zone. The temperature excess between the maximum
temperature case (89.0°F maximum effluent temperature limit minus the 84.2°F WQ standard) is an
excess of 4.8°F. For the conservative, winter scenario, first note that the CORMIX model will not allow
ambient water colder than 4°C (39.2°F). Therefore, while the French Broad River can freeze, as seen in
Table 2-1, 39.2°F is just above the 5t" percentile of the USGS ambient data. The excess temperature
during the coldest months (73.0°F maximum temperature limit minus 39.2°F equals 33.8°F) must be
lowered to a temperature excess of 5.04°F. Because the winter temperature excess at 33.8°F and 837
gpm will result in a larger plume than the 4.8°F and 1,795 gpm excess (2X more flow but 6.4X less
temperature), only a conservative winter model was developed to prove compliance with both instream
standards.
A-
f r � w� 14

4 CORMIX Modeling Summary
This modeling summary describes an application of the CORMIX (Version 11.0) software system.
CORMIX is used for the analysis, prediction, and design of aqueous toxic or conventional pollutant
discharges into diverse water bodies. The major emphasis is on the geometry and dilution
characteristics of the initial mixing zone, but the system also predicts the behavior of the discharge
plume at larger distances. CORMIX3, a subroutine of the CORMIX system, is for surface discharges like
Outfall 001 entering the French Broad River. The purpose of the model study is to estimate the mixing
of the effluent in the French Broad River and determine the downstream temperature under
conservative conditions. The goal is to meet the 84.2°F maximum and 5.047 "delta-T" instream
temperature standards within a relatively short distance downstream. This summary describes the
model inputs and the model prediction of the downstream distance where the effluent has been
reduced to below 5.047 above ambient.
4.1 Model Inputs
Weather conditions prevented the collection of river bathymetry and current measurements during low
flows similar to 7Q10 conditions, and therefore, conservative assumptions were utilized to generate a
conservative CORMIX model. Table 4-1 provides the CORMIX model inputs as well as a summary of the
basis for each. Also note that CORMIX contains geometrical restrictions on certain inputs, for example
the discharge outfall "channel" depth to width ratio.
4.2 Outfall 001 Mixing Zone Results
As described earlier in this report, the purpose of the CORMIX modeling was to estimate how far
downstream the 5.04°F "delta-T" instream standards would be met under conservative modeling
conditions. The model was run that includes multiple layers of conservative assumptions including but
not limited to:
• 73.0°F (December through February) discharge temperature,
• A long-term daily average 837 gpm discharge flow,
• Discounted mixing caused by instream rocks/shoals,
• The lowest ambient temperature allowed by the CORMIX model, and
• Conservative model depth and width at/and summer 7Q10 flow conditions.
The conservative winter model indicates that at a permitted discharge temperature of 73.0°F, the 5.04°F
delta-T instream standard would be met at a distance of less than 40.5 meters (approximately 133 feet;
refer to Figure 4-1). As described above, the 84.2°F instream standard would be met at a considerably
smaller distance. The width of the winter modeled plume is also 7.5 meters (approximately 25 feet)
across the stream, thereby allowing safe passage of organisms around the plume. Appendix A includes
the CORMIX Session and Prediction files for both models, and Appendix B includes graphical
representations of the model predictions.
r L� 15

Table 4-1. CORMIX Model Inputs Table
Input
Units
values
Reference/Notes
Effluent
Thermal Excess
°F
33.8
Worst -case winter thermal excess "concentration" (see below)
Effluent Flow Rate
gpm
837
Maximum combined cycle (Unit 5/6 and Unit 7/8 operating at full
load), winter, 24-hour average flow rate (Duke Calculation ACC00-
CA-M-WP.00.00-03). The maximum calculated flow rate is 1,795
gpm during the summer (not modeled), and the system is designed
to maintain compliance with the 89.6°F maximum instream
standard during the summer (again, not modeled). The estimated
long-term daily average flow is 286 gpm (per Duke 6-28-18 water
balance); 837 gpm is conservative.
Effluent
°F
73.0
70.0°F max. 24-hour avg. winter temp. (Duke Calculation ACC00-CA-
Temperature —
M-WP.00.00-03); add 3°F for grab sampling (instantaneous
Winter
compliance versus a 24-hr average calculated value); winter
Ambient
Average Depth
ft
2.3
Depth at (summer) 7Q10 river conditions (Figure 3-7)
Depth at Discharge
ft
1.61
Estimated from Figure 3-6; 0.01 ft added because it cannot differ
from the average depth by >30%
Wind Speed
m/s
2
Default CORMIX value; minimal effects within near -field prediction
Bounded Width
ft
220
Model "box" width (Figure 3-7)
Appearance
-
2
Uniform channel, but considered to be a slight meander based on
flow path (Figure 3-6)
Ambient Flow Rate
cfs
304
Summer (therefore conservative) 7Q10 from 7/1/05 NPDES permit
NC0000396 fact sheet
Friction Factor
n-value
0.032
Manning's n; includes some pools and shoals at 7Q10
Ambient
°F
39.2
The 5 t h percentile of the 1-1-15 to 7-10-18 USGS Station #03451500
Temperature —
data set is 38.3°F, but the CORMIX model will not allow ambient
Winter
water colder than 4°C (39.2°F).
Discharge — CORMIX 3 (surface discharge - channel)
Nearest Bank
-
right
As seen looking downstream
Depth at Discharge
ft
1.0
Estimate based on discharge from flume, through riprap, and into
an eroded channel down to the 7Q10 water surface; minimal effect
on prediction results between 1.0 and 2.1 feet
Bottom Slope
degrees
45
Reasonable estimate based on visual observation and bathymetry;
no effect on prediction results within range of zero to 45 degrees
Channel Width
ft
20
Estimate based on discharge from flume, through riprap, and into
an eroded channel down to the 7Q10 water surface; depth/width
aspect ratio also restricted by CORMIX to 0.05
Channel Depth
ft
1
Estimate per above
Horiz. Angle
degrees
90
Perpendicular to river flow; sigma
Mixing Zone
WQ Standard
°F
5.04
5.04'F instream "rise-above-background/excess temperature"
(delta-T)
standard
WQ Standard
°F
84.2
Worst -case summer: 89.0°F summer limit minus 84.2°F WQ
(maximum)
standard - temperature excess much less than winter; not modeled
Region of Interest
ft
2,200
Must be >10 times the modeled channel width
Up- F■
r L� 16

Figure 4-1. CORMIX Model Prediction — Approximate Downstream Distance at 5.04'F Excess (GoogleMaps)
17
ry U

Appendix A. CORMIX Session and Prediction Files

Winter Delta-T Model
CORMIX SESSION REPORT:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
CORMIX MIXING ZONE EXPERT SYSTEM
CORMIX Version 11.OGT
HYDRO3:Version-11.0.0.0 April,2018
SITE NAME/LABEL: Duke - Asheville
DESIGN CASE: Outfall 001 - Thermal Winter Delta-T
FILE NAME: C:\Egnyte\Shared\1 Projects\Duke Energy
(DUKE)\Asheville\Thermal Modeling (DUKE0007)\CORMIX\Outfall 001 Thermal
Winter Delta.prd
Using subsystem CORMIX3: Buoyant Surface Discharges
Start of session: 10/08/2018--15:45:24
**************************************************************************
SUMMARY OF INPUT DATA:
--------------------------------------------------------------------------
AMBIENT PARAMETERS:
Cross-section
=
bounded
Width
BS =
67.06 m
Channel regularity
ICHREG =
2
Ambient flowrate
QA =
8.61 m^3/s
Average depth
HA =
0.70 m
Depth at discharge
HD =
0.49 m
Ambient velocity
UA =
0.1831 m/s
Darcy-Weisbach friction factor
F =
0.0904
Calculated from Manning's n
=
0.032
Wind velocity
UW =
2 m/s
Stratification Type
STRCND =
U
Surface temperature
=
4.00 degC
Bottom temperature
=
4.00 degC
Calculated FRESH -WATER DENSITY
values:
Surface density
RHOAS =
999.9749 kg/m^3
Bottom density
RHOAB =
999.9749 kg/m^3
--------------------------------------------------------------------------
DISCHARGE PARAMETERS:
Surface
Discharge
Discharge located on
=
right bank/shoreline
Discharge configuration
=
flush discharge
Distance from bank to outlet
DISTB =
0 m
Discharge angle
SIGMA =
90 deg
Depth near discharge outlet
HDO =
0.30 m
Bottom slope at discharge
SLOPE =
45 deg
Rectangular discharge:
Discharge cross-section area
AO =
1.858061 m^2
Discharge channel width
BO =
6.096 m
Discharge channel depth
HO =
0.3048 m
Discharge aspect ratio
AR =
0.05
Reduced discharge channel due
to intrusion:
Cross-section area
AO =
0.8993 m^2
Channel width
BO =
6.096 m
Channel depth
HO =
0.15 m
Aspect ratio
AR =
0.02
Discharge flowrate
QO =
0.052806 m^3/s
Discharge velocity
UO =
0.06 m/s

Discharge temperature (freshwater)
= 22.78 degC
Corresponding density
RHO0
= 997.5918 kg/m^3
Density difference
DRHO
= 2.3832 kg/m^3
Buoyant acceleration
GPO
= 0.0234 m/s^2
Discharge concentration
CO
= 33.800000 deg.F
Surface heat exchange coeff.
KS
= 0 m/s
Coefficient of decay
KD
= 0 /s
--------------------------------------------------------------------------
DISCHARGE/ENVIRONMENT LENGTH SCALES:
LQ = 0.95 m Lm = 0.30
m
Lbb = 0.20 m
LM = 0.37 m
--------------------------------------------------------------------------
NON-DIMENSIONAL PARAMETERS:
Densimetric Froude number
FRO
= 0.39 (based on LQ)
Channel densimetric Froude no.
FRCH
= 1 (based on HO)
Velocity ratio
R
= 0.32
--------------------------------------------------------------------------
MIXING ZONE / TOXIC DILUTION ZONE
/ AREA
OF INTEREST PARAMETERS:
Toxic discharge
= no
Water quality standard specified
= yes
Water quality standard
CSTD
= 5.04 deg.F
Regulatory mixing zone
= no
Region of interest
= 670.56 m downstream
**************************************************************************
HYDRODYNAMIC CLASSIFICATION:
------------------------
FLOW CLASS = PL2
------------------------
Limiting Dilution S = (QA/QO)+ 1.0 = 164.0
**************************************************************************
MIXING ZONE EVALUATION (hydrodynamic and regulatory summary):
--------------------------------------------------------------------------
X-Y-Z Coordinate system:
Origin is located at WATER SURFACE and at centerline of discharge channel:
0 m from the right bank/shore.
Number of display steps NSTEP = 200 per module.
--------------------------------------------------------------------------
NEAR-FIELD REGION (NFR) CONDITIONS :
Note: The NFR is the zone of strong initial mixing. It has no regulatory
implication. However, this information may be useful for the discharge
designer because the mixing in the NFR is usually sensitive to the
discharge design conditions.
Pollutant concentration at NFR edge c = 33.800000 deg.F
Dilution at edge of NFR s = 1
NFR Location: x = 3.05 m
(centerline coordinates) y = 0.27 m
z = 0 m
NFR plume dimensions: half -width (bh) = 2.04 m
thickness (bv) = 0.14 m
Cumulative travel time: 16.6447 sec.
IVr LA 2

--------------------------------------------------------------------------
Buoyancy assessment:
The effluent density is less than the surrounding ambient water
density at the discharge level.
Therefore, the effluent is POSITIVELY BUOYANT and will tend to rise
towards
the surface.
--------------------------------------------------------------------------
FAR-FIELD MIXING SUMMARY:
Plume becomes vertically fully mixed at 87.68 m downstream.
--------------------------------------------------------------------------
PLUME BANK CONTACT SUMMARY:
Plume in bounded section contacts one bank only at 0 m downstream.
************************ TOXIC DILUTION ZONE SUMMARY *********************
No TDZ was specified for this simulation.
********************** REGULATORY MIXING ZONE SUMMARY ********************
No RMZ has been specified.
However:
The ambient water quality standard was encountered at the following
plume position:
Water quality standard = 5.04 deg.F
Corresponding dilution s = 6.7
Plume location: x = 40.50 m
(centerline coordinates) y = 0 m
z = 0 m
Plume dimensions: half -width (bh) = 7.46 m
thickness (bv) = 0.26 m
********************* FINAL DESIGN ADVICE AND COMMENTS *******************
INTRUSION OF AMBIENT WATER into the discharge opening will occur!
For the present discharge/environment conditions the discharge densimetric
Froude number is well below unity. This is an UNDESIRABLE operating
condition.
To prevent intrusion, change the discharge parameters (e.g. decrease the
discharge opening area) in order to increase the discharge Froude number.
In a future iteration, change the discharge parameters (e.g. decrease port
diameter) in order to increase the Froude number.
--------------------------------------------------------------------------
REMINDER: The user must take note that HYDRODYNAMIC MODELING by any known
technique is NOT AN EXACT SCIENCE.
Extensive comparison with field and laboratory data has shown that the
CORMIX predictions on dilutions and concentrations (with associated
plume geometries) are reliable for the majority of cases and are
accurate to within about +-500 (standard deviation).
As a further safeguard, CORMIX will not give predictions whenever it
judges the design configuration as highly complex and uncertain for
prediction.
IVr LA-3

Winter Delta-T Model
CORMIX3 PREDICTION FILE:
33333333333333333333333333333333333333333333333333333333333333333333333333
CORMIX MIXING ZONE EXPERT SYSTEM
Subsystem CORMIX3: Buoyant Surface Discharges
CORMIX Version 11.OGT
HYDRO3 Version 11.0.0.0 April 2018
--------------------------------------------------------------------------
----------------
CASE DESCRIPTION
Site name/label: Duke - Asheville
Design case: Outfall 001 - Thermal Winter Delta-T
FILE NAME: C:\... 0007)\CORMIX\Outfall 001 Thermal Winter
Delta.prd
Time stamp: 10/08/2018--15:45:24
ENVIRONMENT PARAMETERS (metric units)
Bounded section
BS = 67.06 AS = 47.01 QA = 8.61 ICHREG= 2
HA = 0.70 HD = 0.49
UA = 0.183 F = 0.090 USTAR =0.1947E-01
UW = 2.000 UWSTAR=0.2198E-02
Uniform density environment
STRCND= U RHOAM = 999.9750
DISCHARGE PARAMETERS (metric units)
BANK = RIGHT DISTB = 0.00 Configuration: flush discharge
SIGMA = 90.00 HDO = 0.30 SLOPE = 45.00 deg.
Rectangular channel geometry:
BO = 6.096 HO = 0.305 AO =0.1858E+01 AR =
0.050
Reduced channel geometry due to intrusion:
BO = 6.096 HO = 0.148 AO =0.8993E+00 AR =
0.024
(All relevant parameters further below are based on this geometry.)
UO = 0.059 QO = 0.053 =0.5281E-01
RHO0 = 997.5917 DRHO0 =0.2383E+01 GPO =0.2337E-01
CO =0.3380E+02 CUNITS= deg.F
IPOLL = 1 KS =0.0000E+00 KD =0.0000E+00
FLUX VARIABLES (metric units)
QO
=0.5281E-01
MO
=0.3101E-02 JO
Associated
length
scales
(meters)
LQ
= 0.95
LM
= 0.37 Lm
0.20
NON -DIMENSIONAL
PARAMETERS
FRO
= 0.39
FRCH
= 1.00 R
FLOW CLASSIFICATION
333333333333333333333333333333333333333333
3 Flow class (CORMIX3) = PL2 3
3 Applicable layer depth HS = 0.49 3
=0.1234E-02
0.30 Lb
0.32
IVr LA-4

3 Limiting Dilution S=QA/Q0= 164.02 3
333333333333333333333333333333333333333333
MIXING ZONE / TOXIC DILUTION / REGION OF INTEREST PARAMETERS
CO =0.3380E+02 CUNITS= deg.F
NTOX = 0
NSTD = 1 CSTD =0.5040E+01
REGMZ = 0
XINT = 670.56 XMAX = 670.56
X-Y-Z COORDINATE SYSTEM:
ORIGIN is located at the WATER SURFACE and at center of discharge
channel/outlet: 0.00 m from the RIGHT bank/shore.
X-axis points downstream
Y-axis points to left as seen by an observer looking downstream
Z-axis points vertically upward (in CORMIX3, all values Z = 0.00)
NSTEP = 200 display intervals per module
--------------------------------------------------------------------------
--------------------------------------------------------------------------
BEGIN MOD301: DISCHARGE MODULE
Efflux conditions:
X Y Z S C BV BH UC
TT
0.00 0.00 0.00 1.0 0.338E+02 0.15 3.05 0.059
.00000E+00
END OF MOD301: DISCHARGE MODULE
--------------------------------------------------------------------------
--------------------------------------------------------------------------
BEGIN MOD302: ZONE OF FLOW ESTABLISHMENT
Control volume inflow:
X Y Z S C BV BH UC
TT
0.00 0.00 0.00 1.0 0.338E+02 0.15 3.05 0.059
.00000E+00
RAPID DEFLECTION by ambient current:
Profile definitions:
BV = top -hat thickness,measured vertically
BH = top -hat half -width, measured horizontally from bank/shoreline
S = hydrodynamic average (bulk) dilution
C = average (bulk) concentration (includes reaction effects, if any)
TT = Cumulative travel time
Control volume outflow: SIGMAE-
60.71
X Y Z S C BV BH UC
TT
3.05 0.27 0.00 1.0 0.338E+02 0.14 2.04 0.059
.16645E+02
Cumulative travel time = 16.6447 sec ( 0.00 hrs)
IVr LA-5

END OF MOD302: ZONE OF FLOW ESTABLISHMENT
--------------------------------------------------------------------------
--------------------------------------------------------------------------
** End of NEAR -FIELD REGION (NFR) **
--------------------------------------------------------------------------
WAKE FLOW CONDITIONS: The discharge velocity (UO) is less than or equal
to the
ambient velocity (Ua) and results in wake flow conditions. There is no
discharge
momentum induced mixing. The mixing characteristics are UNDESIRABLE.
--------------------------------------------------------------------------
BEGIN MOD341: BUOYANT AMBIENT SPREADING
Profile definitions:
BV = top -hat thickness,measured vertically
BH = top -hat half -width, measured horizontally from bank/shoreline
S = hydrodynamic average (bulk) dilution
C = average (bulk) concentration (includes reaction effects, if any)
TT = Cumulative travel time
Plume Stage
2 (bank
attached):
X
Y
Z
S
C
BV
BH
TT
3.05
0.00
0.00
1.0
0.338E+02
0.14
2.03
.16645E+02
3.46
-0.00
0.00
1.0
0.332E+02
0.14
2.12
.18862E+02
3.87
-0.00
0.00
1.0
0.325E+02
0.13
2.21
.21079E+02
4.27
-0.00
0.00
1.1
0.319E+02
0.13
2.29
.23297E+02
4.68
-0.00
0.00
1.1
0.313E+02
0.13
2.38
.25514E+02
5.09
-0.00
0.00
1.1
0.307E+02
0.13
2.46
.27731E+02
5.50
-0.00
0.00
1.1
0.301E+02
0.13
2.54
.29948E+02
5.91
-0.00
0.00
1.1
0.296E+02
0.13
2.62
.32166E+02
6.32
-0.00
0.00
1.2
0.290E+02
0.12
2.70
.34383E+02
6.72
-0.00
0.00
1.2
0.284E+02
0.12
2.77
.36600E+02
7.13
-0.00
0.00
1.2
0.279E+02
0.12
2.85
.38817E+02
7.54
-0.00
0.00
1.2
0.273E+02
0.12
2.92
.41035E+02
7.95
-0.00
0.00
1.3
0.268E+02
0.12
3.00
.43252E+02
8.36
-0.00
0.00
1.3
0.263E+02
0.12
3.07
.45469E+02
8.77
-0.00
0.00
1.3
0.257E+02
0.12
3.14
.47686E+02
9.18
-0.00
0.00
1.3
0.252E+02
0.12
3.22
.49904E+02
9.58
-0.00
0.00
1.4
0.247E+02
0.12
3.29
.52121E+02
9.99
-0.00
0.00
1.4
0.242E+02
0.12
3.36
.54338E+02
10.40
-0.00
0.00
1.4
0.237E+02
0.12
3.42
.56555E+02
10.81
-0.00
0.00
1.5
0.232E+02
0.12
3.49
.58773E+02
11.22
-0.00
0.00
1.5
0.227E+02
0.12
3.56
.60990E+02
11.63
-0.00
0.00
1.5
0.222E+02
0.12
3.63
.63207E+02
12.04
-0.00
0.00
1.6
0.217E+02
0.12
3.69
.65424E+02
12.44
-0.00
0.00
1.6
0.212E+02
0.12
3.76
.67642E+02
12.85
-0.00
0.00
1.6
0.208E+02
0.12
3.83
.69859E+02
13.26
-0.00
0.00
1.7
0.203E+02
0.12
3.89
.72076E+02
13.67
-0.00
0.00
1.7
0.199E+02
0.12
3.95
.74293E+02
14.08
-0.00
0.00
1.7
0.195E+02
0.12
4.02
.76511E+02
14.49
-0.00
0.00
1.8
0.190E+02
0.12
4.08
.78728E+02
r L-X� A-6

14.89
-0.00
0.00
1.8
0.186E+02
0.13
4.14
.80945E+02
15.30
-0.00
0.00
1.9
0.182E+02
0.13
4.21
.83162E+02
15.71
-0.00
0.00
1.9
0.178E+02
0.13
4.27
.85380E+02
16.12
-0.00
0.00
1.9
0.174E+02
0.13
4.33
.87597E+02
16.53
-0.00
0.00
2.0
0.170E+02
0.13
4.39
.89814E+02
16.94
-0.00
0.00
2.0
0.166E+02
0.13
4.45
.92031E+02
17.35
-0.00
0.00
2.1
0.163E+02
0.13
4.51
.94249E+02
17.75
-0.00
0.00
2.1
0.159E+02
0.13
4.57
.96466E+02
18.16
-0.00
0.00
2.2
0.155E+02
0.13
4.63
.98683E+02
18.57
-0.00
0.00
2.2
0.152E+02
0.14
4.69
.10090E+03
18.98
-0.00
0.00
2.3
0.149E+02
0.14
4.75
.10312E+03
19.39
-0.00
0.00
2.3
0.145E+02
0.14
4.80
.10533E+03
19.80
-0.00
0.00
2.4
0.142E+02
0.14
4.86
.10755E+03
20.21
-0.00
0.00
2.4
0.139E+02
0.14
4.92
.10977E+03
20.61
-0.00
0.00
2.5
0.136E+02
0.14
4.98
.11199E+03
21.02
-0.00
0.00
2.5
0.133E+02
0.15
5.03
.11420E+03
21.43
-0.00
0.00
2.6
0.130E+02
0.15
5.09
.11642E+03
21.84
-0.00
0.00
2.7
0.127E+02
0.15
5.14
.11864E+03
22.25
-0.00
0.00
2.7
0.124E+02
0.15
5.20
.12086E+03
22.66
-0.00
0.00
2.8
0.121E+02
0.15
5.26
.12307E+03
23.07
-0.00
0.00
2.8
0.119E+02
0.15
5.31
.12529E+03
23.47
-0.00
0.00
2.9
0.116E+02
0.16
5.37
.12751E+03
23.88
-0.00
0.00
3.0
0.114E+02
0.16
5.42
.12972E+03
24.29
-0.00
0.00
3.0
0.111E+02
0.16
5.48
.13194E+03
24.70
-0.00
0.00
3.1
0.109E+02
0.16
5.53
.13416E+03
25.11
-0.00
0.00
3.2
0.106E+02
0.16
5.58
.13638E+03
25.52
-0.00
0.00
3.2
0.104E+02
0.16
5.64
.13859E+03
25.92
-0.00
0.00
3.3
0.102E+02
0.17
5.69
.14081E+03
26.33
-0.00
0.00
3.4
0.998E+01
0.17
5.74
.14303E+03
26.74
-0.00
0.00
3.5
0.977E+01
0.17
5.80
.14525E+03
27.15
-0.00
0.00
3.5
0.956E+01
0.17
5.85
.14746E+03
27.56
-0.00
0.00
3.6
0.936E+01
0.18
5.90
.14968E+03
27.97
-0.00
0.00
3.7
0.916E+01
0.18
5.95
.15190E+03
28.38
-0.00
0.00
3.8
0.897E+01
0.18
6.00
.15411E+03
28.78
-0.00
0.00
3.8
0.879E+01
0.18
6.06
.15633E+03
29.19
-0.00
0.00
3.9
0.861E+01
0.18
6.11
.15855E+03
29.60
-0.00
0.00
4.0
0.843E+01
0.19
6.16
.16077E+03
30.01
-0.00
0.00
4.1
0.826E+01
0.19
6.21
.16298E+03
30.42
-0.00
0.00
4.2
0.809E+01
0.19
6.26
.16520E+03
30.83
-0.00
0.00
4.3
0.793E+01
0.19
6.31
.16742E+03
31.24
-0.00
0.00
4.4
0.777E+01
0.20
6.36
.16964E+03
31.64
-0.00
0.00
4.4
0.761E+01
0.20
6.41
.17185E+03
32.05
-0.00
0.00
4.5
0.746E+01
0.20
6.46
.17407E+03
32.46
-0.00
0.00
4.6
0.731E+01
0.20
6.51
.17629E+03
32.87
-0.00
0.00
4.7
0.717E+01
0.21
6.56
.17850E+03
33.28
-0.00
0.00
4.8
0.703E+01
0.21
6.61
.18072E+03
33.69
-0.00
0.00
4.9
0.689E+01
0.21
6.66
.18294E+03
34.10
-0.00
0.00
5.0
0.676E+01
0.21
6.71
.18516E+03
34.50
-0.00
0.00
5.1
0.663E+01
0.22
6.76
.18737E+03
34.91
-0.00
0.00
5.2
0.650E+01
0.22
6.81
.18959E+03
35.32
-0.00
0.00
5.3
0.638E+01
0.22
6.86
.19181E+03
35.73
-0.00
0.00
5.4
0.625E+01
0.22
6.90
.19403E+03
36.14
-0.00
0.00
5.5
0.614E+01
0.23
6.95
.19624E+03
r �� A-7

36.55
-0.00
0.00
5.6
0.602E+01
0.23
7.00
.19846E+03
36.95
-0.00
0.00
5.7
0.591E+01
0.23
7.05
.20068E+03
37.36
-0.00
0.00
5.8
0.580E+01
0.24
7.10
.20289E+03
37.77
-0.00
0.00
5.9
0.569E+01
0.24
7.14
.20511E+03
38.18
-0.00
0.00
6.0
0.559E+01
0.24
7.19
.20733E+03
38.59
-0.00
0.00
6.2
0.549E+01
0.24
7.24
.20955E+03
39.00
-0.00
0.00
6.3
0.539E+01
0.25
7.29
.21176E+03
39.41
-0.00
0.00
6.4
0.529E+01
0.25
7.33
.21398E+03
39.81
-0.00
0.00
6.5
0.519E+01
0.25
7.38
.21620E+03
40.22
-0.00
0.00
6.6
0.510E+01
0.26
7.43
.21841E+03
** WATER QUALITY STANDARD OR
CCC HAS
BEEN FOUND
**
The pollutant concentration
in the
plume falls
below
water quality
standard or
CCC value
of 0.504E+01
in the current prediction
interval.
This is the
spatial extent of
concentrations
exceeding
the water
quality
standard or
CCC value.
40.63
-0.00
0.00
6.7
0.501E+01
0.26
7.47
.22063E+03
41.04
-0.00
0.00
6.9
0.492E+01
0.26
7.52
.22285E+03
41.45
-0.00
0.00
7.0
0.484E+01
0.26
7.57
.22507E+03
41.86
-0.00
0.00
7.1
0.475E+01
0.27
7.61
.22728E+03
42.27
-0.00
0.00
7.2
0.467E+01
0.27
7.66
.22950E+03
42.67
-0.00
0.00
7.4
0.459E+01
0.27
7.70
.23172E+03
43.08
-0.00
0.00
7.5
0.451E+01
0.28
7.75
.23394E+03
43.49
-0.00
0.00
7.6
0.443E+01
0.28
7.80
.23615E+03
43.90
-0.00
0.00
7.8
0.436E+01
0.28
7.84
.23837E+03
44.31
-0.00
0.00
7.9
0.429E+01
0.29
7.89
.24059E+03
44.72
-0.00
0.00
8.0
0.421E+01
0.29
7.93
.24280E+03
45.13
-0.00
0.00
8.2
0.414E+01
0.29
7.98
.24502E+03
45.53
-0.00
0.00
8.3
0.408E+01
0.30
8.02
.24724E+03
45.94
-0.00
0.00
8.4
0.401E+01
0.30
8.07
.24946E+03
46.35
-0.00
0.00
8.6
0.394E+01
0.30
8.11
.25167E+03
46.76
-0.00
0.00
8.7
0.388E+01
0.31
8.16
.25389E+03
47.17
-0.00
0.00
8.9
0.382E+01
0.31
8.20
.25611E+03
47.58
-0.00
0.00
9.0
0.375E+01
0.31
8.24
.25833E+03
47.98
-0.00
0.00
9.2
0.369E+01
0.32
8.29
.26054E+03
48.39
-0.00
0.00
9.3
0.363E+01
0.32
8.33
.26276E+03
48.80
-0.00
0.00
9.4
0.358E+01
0.32
8.38
.26498E+03
49.21
-0.00
0.00
9.6
0.352E+01
0.33
8.42
.26719E+03
49.62
-0.00
0.00
9.8
0.347E+01
0.33
8.46
.26941E+03
50.03
-0.00
0.00
9.9
0.341E+01
0.33
8.51
.27163E+03
50.44
-0.00
0.00
10.1
0.336E+01
0.34
8.55
.27385E+03
50.84
-0.00
0.00
10.2
0.331E+01
0.34
8.60
.27606E+03
51.25
-0.00
0.00
10.4
0.326E+01
0.34
8.64
.27828E+03
51.66
-0.00
0.00
10.5
0.321E+01
0.35
8.68
.28050E+03
52.07
-0.00
0.00
10.7
0.316E+01
0.35
8.72
.28272E+03
52.48
-0.00
0.00
10.9
0.311E+01
0.36
8.77
.28493E+03
52.89
-0.00
0.00
11.0
0.306E+01
0.36
8.81
.28715E+03
53.30
-0.00
0.00
11.2
0.302E+01
0.36
8.85
.28937E+03
53.70
-0.00
0.00
11.4
0.297E+01
0.37
8.90
.29158E+03
54.11
-0.00
0.00
11.5
0.293E+01
0.37
8.94
.29380E+03
54.52
-0.00
0.00
11.7
0.289E+01
0.37
8.98
.29602E+03
54.93
-0.00
0.00
11.9
0.285E+01
0.38
9.02
.29824E+03
55.34
-0.00
0.00
12.1
0.280E+01
0.38
9.07
.30045E+03
55.75
-0.00
0.00
12.2
0.276E+01
0.38
9.11
.30267E+03
r L-X� A-8

56.16
-0.00
0.00
12.4
0.272E+01
0.39
9.15
.30489E+03
56.56
-0.00
0.00
12.6
0.268E+01
0.39
9.19
.30710E+03
56.97
-0.00
0.00
12.8
0.265E+01
0.40
9.23
.30932E+03
57.38
-0.00
0.00
13.0
0.261E+01
0.40
9.28
.31154E+03
57.79
-0.00
0.00
13.1
0.257E+01
0.40
9.32
.31376E+03
58.20
-0.00
0.00
13.3
0.254E+01
0.41
9.36
.31597E+03
58.61
-0.00
0.00
13.5
0.250E+01
0.41
9.40
.31819E+03
59.01
-0.00
0.00
13.7
0.247E+01
0.42
9.44
.32041E+03
59.42
-0.00
0.00
13.9
0.243E+01
0.42
9.48
.32263E+03
59.83
-0.00
0.00
14.1
0.240E+01
0.42
9.53
.32484E+03
60.24
-0.00
0.00
14.3
0.237E+01
0.43
9.57
.32706E+03
60.65
-0.00
0.00
14.5
0.233E+01
0.43
9.61
.32928E+03
61.06
-0.00
0.00
14.7
0.230E+01
0.44
9.65
.33149E+03
61.47
-0.00
0.00
14.9
0.227E+01
0.44
9.69
.33371E+03
61.87
-0.00
0.00
15.1
0.224E+01
0.44
9.73
.33593E+03
62.28
-0.00
0.00
15.3
0.221E+01
0.45
9.77
.33815E+03
62.69
-0.00
0.00
15.5
0.218E+01
0.45
9.81
.34036E+03
63.10
-0.00
0.00
15.7
0.215E+01
0.46
9.85
.34258E+03
63.51
-0.00
0.00
15.9
0.213E+01
0.46
9.89
.34480E+03
63.92
-0.00
0.00
16.1
0.210E+01
0.46
9.93
.34702E+03
64.33
-0.00
0.00
16.3
0.207E+01
0.47
9.97
.34923E+03
64.73
-0.00
0.00
16.5
0.204E+01
0.47
10.01
.35145E+03
65.14
-0.00
0.00
16.7
0.202E+01
0.48
10.06
.35367E+03
65.55
-0.00
0.00
17.0
0.199E+01
0.48
10.10
.35588E+03
65.96
-0.00
0.00
17.2
0.197E+01
0.49
10.14
.35810E+03
66.37
-0.00
0.00
17.4
0.194E+01
0.49
10.18
.36032E+03
66.78
-0.00
0.00
17.6
0.192E+01
0.49
10.22
.36254E+03
67.19
-0.00
0.00
17.8
0.189E+01
0.50
10.26
.36475E+03
67.59
-0.00
0.00
18.1
0.187E+01
0.50
10.29
.36697E+03
68.00
-0.00
0.00
18.3
0.185E+01
0.51
10.33
.36919E+03
68.41
-0.00
0.00
18.5
0.182E+01
0.51
10.37
.37141E+03
68.82
-0.00
0.00
18.8
0.180E+01
0.52
10.41
.37362E+03
69.23
-0.00
0.00
19.0
0.178E+01
0.52
10.45
.37584E+03
69.64
-0.00
0.00
19.2
0.176E+01
0.52
10.49
.37806E+03
70.04
-0.00
0.00
19.5
0.174E+01
0.53
10.53
.38027E+03
70.45
-0.00
0.00
19.7
0.172E+01
0.53
10.57
.38249E+03
70.86
-0.00
0.00
19.9
0.170E+01
0.54
10.61
.38471E+03
71.27
-0.00
0.00
20.2
0.168E+01
0.54
10.65
.38693E+03
71.68
-0.00
0.00
20.4
0.166E+01
0.55
10.69
.38914E+03
72.09
-0.00
0.00
20.7
0.164E+01
0.55
10.73
.39136E+03
72.50
-0.00
0.00
20.9
0.162E+01
0.56
10.77
.39358E+03
72.90
-0.00
0.00
21.2
0.160E+01
0.56
10.81
.39579E+03
73.31
-0.00
0.00
21.4
0.158E+01
0.57
10.84
.39801E+03
73.72
-0.00
0.00
21.7
0.156E+01
0.57
10.88
.40023E+03
74.13
-0.00
0.00
21.9
0.154E+01
0.57
10.92
.40245E+03
74.54
-0.00
0.00
22.2
0.153E+01
0.58
10.96
.40466E+03
74.95
-0.00
0.00
22.4
0.151E+01
0.58
11.00
.40688E+03
75.36
-0.00
0.00
22.7
0.149E+01
0.59
11.04
.40910E+03
75.76
-0.00
0.00
22.9
0.147E+01
0.59
11.07
.41132E+03
76.17
-0.00
0.00
23.2
0.146E+01
0.60
11.11
.41353E+03
76.58
-0.00
0.00
23.5
0.144E+01
0.60
11.15
.41575E+03
76.99
-0.00
0.00
23.7
0.142E+01
0.61
11.19
.41797E+03
77.40
-0.00
0.00
24.0
0.141E+01
0.61
11.23
.42018E+03
r �� A-9

77.81
-0.00
0.00
24.3
0.139E+01
0.62
11.27
.42240E+03
78.21
-0.00
0.00
24.5
0.138E+01
0.62
11.30
.42462E+03
78.62
-0.00
0.00
24.8
0.136E+01
0.63
11.34
.42684E+03
79.03
-0.00
0.00
25.1
0.135E+01
0.63
11.38
.42905E+03
79.44
-0.00
0.00
25.4
0.133E+01
0.64
11.42
.43127E+03
79.85
-0.00
0.00
25.6
0.132E+01
0.64
11.45
.43349E+03
80.26
-0.00
0.00
25.9
0.130E+01
0.65
11.49
.43571E+03
80.67
-0.00
0.00
26.2
0.129E+01
0.65
11.53
.43792E+03
81.07
-0.00
0.00
26.5
0.128E+01
0.66
11.57
.44014E+03
81.48
-0.00
0.00
26.8
0.126E+01
0.66
11.61
.44236E+03
81.89
-0.00
0.00
27.1
0.125E+01
0.67
11.64
.44457E+03
82.30
-0.00
0.00
27.3
0.124E+01
0.67
11.68
.44679E+03
82.71
-0.00
0.00
27.6
0.122E+01
0.68
11.72
.44901E+03
83.12
-0.00
0.00
27.9
0.121E+01
0.68
11.75
.45123E+03
83.53
-0.00
0.00
28.2
0.120E+01
0.69
11.79
.45344E+03
83.93
-0.00
0.00
28.5
0.119E+01
0.69
11.83
.45566E+03
84.34
-0.00
0.00
28.8
0.117E+01
0.70
11.87
.45788E+03
84.75
-0.00
0.00
29.1
0.116E+01
0.70
11.90
.46010E+03
Cumulative
travel time
=
460.0961 sec
(
0.13 hrs)
END OF MOD341: BUOYANT AMBIENT SPREADING
--------------------------------------------------------------------------
--------------------------------------------------------------------------
BEGIN MOD361: PASSIVE AMBIENT MIXING IN UNIFORM AMBIENT
Vertical diffusivity (initial value) = 0.273E-02 m^2/s
Horizontal diffusivity (initial value) = 0.683E-02 m^2/s
Profile definitions:
BV = Gaussian s.d.*sgrt(pi/2) (46%) thickness, measured vertically
or equal to water depth, if fully mixed
BH = Gaussian s.d.*sgrt(pi/2) (46%) half -width,
measured horizontally in Y-direction
S = hydrodynamic centerline dilution
C = centerline concentration (includes reaction efects, if any)
TT = Cumulative travel time
Plume Stage 2 (bank attached):
X
Y
Z
S
C
BV
BH
TT
84.75
0.00
0.00
29.1
0.116E+01
0.70
11.90
.46010E+03
Plume interacts
with BOTTOM.
The passive
diffusion
plume
becomes
VERTICALLY
FULLY
MIXED within
this
prediction
interval.
87.68
-0.00
0.00
29.1
0.116E+01
0.70
11.92
.47599E+03
90.61
-0.00
0.00
29.2
0.116E+01
0.70
11.93
.49189E+03
93.54
-0.00
0.00
29.2
0.116E+01
0.70
11.95
.50779E+03
96.47
-0.00
0.00
29.3
0.116E+01
0.70
11.96
.52369E+03
99.40
-0.00
0.00
29.3
0.115E+01
0.70
11.97
.53958E+03
102.33
-0.00
0.00
29.3
0.115E+01
0.70
11.99
.55548E+03
105.25
-0.00
0.00
29.4
0.115E+01
0.70
12.00
.57138E+03
108.18
-0.00
0.00
29.4
0.115E+01
0.70
12.02
.58728E+03
111.11
-0.00
0.00
29.4
0.115E+01
0.70
12.03
.60317E+03
114.04
-0.00
0.00
29.5
0.115E+01
0.70
12.05
.61907E+03
A-10
IV L

116.97
-0.00
0.00
29.5
0.115E+01
0.70
12.06
.63497E+03
119.90
-0.00
0.00
29.5
0.114E+01
0.70
12.07
.65087E+03
122.83
-0.00
0.00
29.6
0.114E+01
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A-11
r � L�

272.21
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A-12
r � L�

427.45
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A-13
r � L�

582.69
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629.55
-0.00
0.00
35.0
0.965E+00
0.70
14.32
.34170E+04
632.48
-0.00
0.00
35.1
0.964E+00
0.70
14.33
.34329E+04
635.41
-0.00
0.00
35.1
0.963E+00
0.70
14.35
.34488E+04
638.34
-0.00
0.00
35.1
0.962E+00
0.70
14.36
.34647E+04
641.27
-0.00
0.00
35.1
0.962E+00
0.70
14.37
.34806E+04
644.20
-0.00
0.00
35.2
0.961E+00
0.70
14.38
.34965E+04
647.13
-0.00
0.00
35.2
0.960E+00
0.70
14.39
.35124E+04
650.06
-0.00
0.00
35.2
0.959E+00
0.70
14.41
.35283E+04
652.98
-0.00
0.00
35.3
0.958E+00
0.70
14.42
.35442E+04
655.91
-0.00
0.00
35.3
0.958E+00
0.70
14.43
.35601E+04
658.84
-0.00
0.00
35.3
0.957E+00
0.70
14.44
.35760E+04
661.77
-0.00
0.00
35.4
0.956E+00
0.70
14.45
.35919E+04
664.70
-0.00
0.00
35.4
0.955E+00
0.70
14.46
.36078E+04
667.63
-0.00
0.00
35.4
0.955E+00
0.70
14.48
.36237E+04
670.56
-0.00
0.00
35.4
0.954E+00
0.70
14.49
.36396E+04
Cumulative
travel time
=
3639.6172 sec
(
1.01 hrs)
Simulation limit based on maximum specified distance = 670.56 m.
This is the REGION OF INTEREST limitation.
END OF MOD361: PASSIVE AMBIENT MIXING IN UNIFORM AMBIENT
--------------------------------------------------------------------------
--------------------------------------------------------------------------
CORMIX3: Buoyant Surface Discharges End of Prediction
File
33333333333333333333333333333333333333333333333333333333333333333333333333
A-14
IVY L

Appendix B. CORMIX CorView Graphics

Winter Delta-T Model — ISO View
UA
Discharge Excess (°F)
0. 70 0.23 0.53 7.23 2.84 6.56 75.76 35.00
Oulfall 001 Thermal Winter Della
Row Class: PL2 Ongin: Water Surface
CORMIX3 Simulation Length units in meters
Distortion Scale: Y:X =1 Z:X =20
Visualization up to X = 50 m (out of R0I X = 671 m)
Plume Centerline
Fnd of Near Reid Region JNFR]
— — — Cormix Module Boundary (MOD)
B-1

Winter Delta-T Model — Plan View
Y
1a
6
4
2
X
I--Z
5... 4 5 10 15 20 25 30 35 40 45 50 55
I
Oulfall 001 Thermal Winter Oelfa
Discharge Excess (OF) Row Class: PI-2 Origin: Water Surface — — — Plume Centerline
0. 70 0.23 0,53 1.23 2.84 6.56 75.76 35.00 CORMIx3 Simulation Length units in meters - - — End of Near Field Region {NPR]
— Cormix Module Boundary (MOD)
DistortionScale Y:x = 1 Z:x =0.01
Visualization up to x = 50 in (out of ROI x = 671 m)
B-2

Winter Delta-T Model
utfall iii,1 Them7aI ',iMerDelta.rc
Flo... Olass. FL2 Concentration Excess vs. Downstream Distance Concentration Excess (T)
3u
3ii
2u
�. 20
1v
ii
ii 10 20 30 40 50
Downstream Distance (m) 4,v!.5m
..
r B-3

Water Environment Consultants
P.O. Box 2221
Mount Pleasant, SC 29465
[phone]
,-Ae AMW
-
-,Mom,
�
Alf

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
Attachment F
Form 2C Item VI
Potential Discharges Not Covered By Analysis

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
Attachment F
Form 2C - Item VI — Potential Discharges Not Covered By Analysis
Chemical
Storage
Purpose
TURBINE BUILDING
Oxygen Scavenger, Elimin-Ox
75 gallon tote
Auxiliary Boiler oxygen scavenger
Aq Ammonia, 19%
2 x 400 gallon
Condensate pH control
Phosphate, BT-3000
2 x 800 gallon
Feedwater scale and pH control
Aq Ammonia, 19%
2 x 20,000 gallon
SCR
Propylene glycol
Freeze protection for closed
cooling loop
WATER TREATMENT BUILDING
Dispersant, 3DT487
4,400 gallon
Circ Water Scale & Corrosion
Control / Dispersant
Sodium Hypochlorite, 12.5%
8,500 gallon
Water Treatment
Sodium Bisulfite, 38%
800 gallon
Dechlorination for cooling water
and makeup water treatment
Coagulant
5,000 gallon
Circ Water Sidestream coagulant
Polymer
Circ Water Sidestream polymer
Coagulant
800 gallon
Makeup water coagulant
Sodium Hydroxide, 25%
800 gallon
Makeup water pH adjustment
Sulfuric Acid, 93-98%
800 gallon
Makeup water pH adjustment
Citric Acid, 50%
800 gallon
Makeup water
Anti-scalant
800 gallon
RO membrane scale prevention
* Combined Cycle flows only depicted on this table. Current permit Attachment 4 with effective
date of 12/1/2018 remains until notification is submitted at later date.

Duke Energy Progress, Inc
Asheville Stream Electric Plant
National Pollutant Discharge Elimination System Permit Number NC0000396
Attachment G
Estimated Intake and Effluent Characterization for Internal Outfalls

Attachment G
Estimated Intake and Effluent Characterization for Internal Outfalls
Units
Raw Water
Intake'
Cooling Tower
Blowdown
001A/001C
Streams 5, 39 2,3
Oil Water
Separator
00113/001D
Streams 25, 32 3
Aluminum (Al)
mg/L
0.03
0.24
0.03
Barium (Ba)
mg/L
0.012
0.096
0.012
Boron (B)
mg/L
<0.02
<0.16
<0.02
Cadmium (Cd)
mg/L
<0.005
<0.040
<0.005
Calcium (Ca)
mg/L
3.6
28.8
3.6
Chromium (Cr)
mg/L
<0.015
<0.120
<0.015
Copper (Cu)
mg/L
<0.03
<0.24
<0.03
Iron (Fe)
mg/L
0.03
0.24
0.03
Lead (Pb)
mg/L
<0.10
<0.80
<0.10
Lithium (Li)
mg/L
<0.005
<0.04
<0.005
Magnesium (Mg)
mg/L
2.3
18.4
2.3
Manganese (Mn)
mg/L
0.005
0.04
0.005
Molybdenum (Mo)
mg/L
<0.04
<0.32
<0.04
Nickel (Ni)
mg/L
<0.01
<0.08
<0.01
Phosphorus (P)
mg/L
<0.03
<0.24
<0.03
Potassium (K)
mg/L
2.2
17.6
2.2
Silica (Si02)
mg/L
7.8
62.4
7.8
Sodium (Na)
mg/L
7.5
60
7.5
Strontium (Sr)
mg/L
0.028
0.224
0.028
Vanadium (V)
mg/L
<0.01
<0.08
<0.01
Zinc (Zn)
mg/L
<0.01
<0.08
<0.01
Chloride (Cl)
mg/L
11
128
11
Nitrite (NO2)
mg/L
<0.20
<1.60
<0.20
Bromide (Br)
mg/L
<0.20
<1.60
<0.20
Nitrate (NO3)
mg/L
0.2
1.6
0.2
Sulfate (SO4)
mg/L
4.7
37.6
4.7
Phosphate (PO4)
mg/L
5.3
Total Alkalinity (CaCO3)
mg/L
16
128
16
Conductivity at 25°C
µS/cm
79
632
79
pH @ 25°C
pH Units
7.4
8
7.4
TSS
mg/L
5
<50
Turbidity
NTU
5
O&G
mg/L
I
I <10
NOTES:
1. Nalco Water Analysis NW 177927, sampled 2-Oct-2015. Raw Water Sampling point: Lake Julian
2. Cooling Tower Cycles of Concentration (per OTQ DUKE-ME-OTQ-000007): 8
3. Values listed are estimated based on water source characteristics and normal design operations.