NC0024406_Special Order By Consent_20190213

RECEIVED/DEMO/W
NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION FEB 1 3 2019
COUNTY OF STOKES Water
a€ �:sourcea
Permitting Section
IN THE MATTER OF )
NORTH CAROLINA ) SPECIAL ORDER BY CONSENT
NPDES PERMIT NC0024406 ) EMC SOC WQ S18-009
HELD BY )
DUKE ENERGY CAROLINAS, LLC )
Pursuant to the provisions of North Carolina General Statutes (G.S.) 143-215.2,this Special
Order by Consent is entered into by Duke Energy Carolinas, LLC,hereinafter referred to as
Duke Energy, and the North Carolina Environmental Management Commission, an agency of
the State of North Carolina created by G.S. 143B-282, and hereinafter referred to as the
Commission. Duke Energy and the Commission are referred to hereafter collectively as the
"Parties."
1. Duke Energy and the Commission hereby stipulate the following:
(a) Duke Energy holds North Carolina NPDES permit NC0024406 for the operation of
an existing treatment system for coal ash wastewater at its Belews Creek Steam
Station and the discharge of treated wastewater from that system.
(b) The Belews Creek Steam Station is a two-unit, coal fired electric generating facility
with a 2,240 megawatt capacity, located on Belews Lake in southeastern Stokes
County. The facility was constructed during the early 1970s. It was placed into
service for commercial operation in 1974, and will continue to operate into the future.
(c) Treatment of coal ash wastewater is provided primarily through the use of a coal ash
basin at the site that allows for the settling of solids within the coal ash slurry and
eventual discharge of its liquid portion. The coal ash basin was constructed from
1970-1972 through the installation of an earthen dam across an unnamed tributary
(UT)to the Dan River northwest of the steam station. The coal ash basin created by
this activity has a surface area of approximately 342 acres.
(d) The coal ash basin originally discharged to Belews Lake, a 3,200 acre impoundment
also created by Duke Energy in the 1970s as a source of cooling water for the steam
station. Due to findings of elevated levels of selenium in Belews Lake during the
1980s,the outfall from the ash basin was relocated to its current location,(Outfall
003)in 1985.

EMC SOC WQ S18-009
Duke Energy Carolinas,LLC
p. 2
(e) Outfall 003 was constructed as a concrete cascade structure with discharge to a
channelized feature within the valley landscape below the earthen dam. In previous
versions of the NPDES permit, Outfall 003 has been described as a discharge to the
Dan River with the feature receiving the flow from the concrete cascade understood
to be an effluent channel. In accord with this determination, effluent limitations for
Outfall 003 were based upon conditions in the Dan River.
(f) Investigations conducted by the U.S. Army Corps of Engineers and the North
Carolina Department of Environmental Quality during 2017 each concluded that
feature receiving flow from the concrete cascade is a UT to the Dan River.
(g) The latest draft of a proposed NPDES permit renewal for the Belews Creek Steam
Station has adopted the conclusion noted in paragraph(f) above. The draft permit
designates the receiving stream for the discharge from Outfall 003 to be a UT to the
Dan River and a zero flow stream.
(h) The latest draft of a proposed NPDES permit renewal for the Belews Creek Steam
Station also provides coverage for the discharge of wastewater from Outfall 111, seep
discharge from toe drains within the ash basin's earthen dam. This discharge also
flows to the UT to the Dan River,upstream of the Outfall 003 discharge point
(i) Because the receiving stream for Outfalls 003 and 111 is a zero flow stream,the
proposed effluent limits associated with monitoring of the discharges in the draft
permit are set as the water quality standards established for WS-IV waters (the stream
classification of the UT to the Dan River) for those parameters.
(j) Monitoring of the discharges from Outfalls 003 and 111 indicates that upon the
prospective effective date of the NPDES permit renewal(currently estimated to be
early 2019),the discharges will be noncompliant with the proposed effluent limits.
(k) Noncompliance with fmal effluent limits will constitute causing and contributing to
pollution of the waters of this State named above, and Duke Energy is within the
jurisdiction of the Commission as set forth in G.S. Chapter 143,Article 21.
(1) The composition of the discharged effluent will not substantially change from the
effluent discharged from this facility for the past 34 years. While this Special Order
provides relief from certain proposed effluent limits in NPDES permit NC0024406,
these modified limits (see paragraphs 2(f), (g), and(h)) are more stringent than those
applied in prior NPDES permits for this facility.
(m) Notwithstanding paragraph(k) above,which establishes standing for the issuance of
this Special Order,the Commission and Duke Energy further stipulate that no
wrongdoing occurred on the part of Duke Energy through the discharge of wastewater
via Outfall 003 as it was allowed under the terms of prior versions of NPDES permit
NC0024406.

EMC SOC WQ S18-009
Duke Energy Carolinas,LLC
P. 3
(n) Duke Energy will close the Belews Creek Steam Station coal ash impoundment in
accordance with applicable requirements set out in the North Carolina Coal Ash
Management Act and the Federal Coal Combustion Residuals rule. This will require
relocation of contributing flows to the ash basin, followed by decanting and
dewatering of the basin. These contributing flows will be redirected to a Lined
Retention Basin.
(o) In accord with the compliance schedule below,Duke Energy has agreed to construct
an outfall pipe from the Lined Retention Basin to the Dan River on an expedited
basis. This pipe will discharge at new Outfall 006.
(p) Additionally,Duke Energy has agreed to route the discharge of all ash basin
dewatering flow to the Dan River via Outfall 006.
(q) In accord with the compliance schedule below,Duke Energy has also agreed to
reroute any flow from Outfall 111 that remains after decanting of the ash basin is
completed to Outfall 006 on an expedited basis.
(r) Upon completion of these construction activities, discharge of wastewater to the UT
to the Dan River will be eliminated.
(s) Since this Special Order is by Consent,neither party will file a petition for a contested
case or for judicial review concerning its terms.
2. Duke Energy, desiring to comply with the permit identified in paragraph 1(a) above,hereby
agrees to do the following:
(a) Outfalls 006, 003 and 003A: Undertake the following activities in accordance with
the indicated time schedule:
(1) Conduct decanting activities at the Belews Creek Steam Station ash basin in
accordance with the schedule established in EMC WQ SOC S 18-004.
(2) On or before March 31,2019,begin construction of new NPDES Outfall 006.
(3) On or before August 31, 2020, complete construction of Outfall 006.
(4) On or before September 30, 2020,begin discharging to the Dan River via
NPDES Outfall 006 and eliminate discharge from Outfalls 003 and 003A.

EMC SOC WQ S 18-009
Duke Energy Carolinas,LLC
p. 4
(b) Outfall 111: Undertake the following activities in accordance with the indicated time
schedule:
(1) On or before March 31,2020,begin construction of the rerouting of flow from
the toe drain seepage discharge (Outfall 111)to Outfall 006.
(2) On or before August 31, 2020, complete construction of the rerouting of the toe
drain seepage discharge(Outfall 111)to Outfall 006.
(3) On or before September 30,2020,begin discharging toe drain seepage to the
Dan River via Outfall 006 and eliminate discharge from Outfall 111.
(c) No later than January 31 and July 31 of each year during the time this Special Order
is in effect,provide semi-annual progress reports documenting activities associated
with the planning, design, construction and use of the new outfall to the Dan River.
The reports are to be submitted as follows: one copy must be mailed to the Winston-
, Salem Regional Supervisor,Division of Water Resources/Water Quality Regional
Operations Section, 450 West Hanes Mill Road; Suite 300,Winston-Salem,NC
27105, and one copy must be mailed to the Division of Water Quality/Water Quality
Permitting Section, 1617 Mail Service Center,Raleigh,NC 27699-1617.
(d) No later than thirty(30)calendar days after any date identified for accomplishment of
any activity listed in paragraphs 2(a) and 2(b) above, submit to the Director of DWR
a written notice of compliance(including the date compliance was achieved along
with supporting documentation if applicable) or noncompliance therewith. In the
case of noncompliance,the notice shall include a statement of the reason(s) for
noncompliance,remedial action(s)taken, and a statement identifying the extent to
which subsequent dates or times for accomplishment of listed activities may be
affected.
(e) •Duke Energy shall comply with all terms and conditions of NPDES Permit
NC0024406 except those effluent limitations identified in paragraphs 2(f), 2(g) and
2(h)below. See Attachments A,B, C and D for all monitoring requirements and
effluent limitations. The Permittee may also be required to monitor for other
parameters as deemed necessary by the Director in future permits or administrative
letters.
(f) During the time in which this Special Order by Consent(SOC)is effective,Duke
Energy shall comply with the effluent limitations for Outfall 003 contained in NPDES
permit NC0024406 unless modified below:

EMC SOC WQ S18-009
Duke Energy Carolinas,LLC
p. 5
Under this SOC, only the parameters listed below for Outfall 003 have been modified
from the NPDES Permit NC0024406 issued in 2019.
During Normal Operations &Decanting
Permit Limits Modified Limits(SOC)
Parameter Monthly Daily Monthly Daily
Average Maximum Average Maximum
Total Arsenic 10.0 µg/L 340.0 µg/L 75.0 µg/L 340.0 µg/L
Chlorides 250.0 mg/L 250.0 mg/L Monitor&Report
Total Selenium 5.0 µg/L 56.0 µg/L 25.0 µg/L 56.0 µg/L
Chronic Toxicity Ceriodaphnia P/F @ 90% Ceriodaphnia Full Range
Testing—Monitor Only
(g) During the time in which this Special Order by Consent(SOC)is effective,Duke
Energy shall comply with the effluent limitations for Outfall 003A contained in
NPDES permit NC0024406 unless modified below:
Under this SOC,only the parameters listed below for Outfall 003A have been modified
from the NPDES Permit NC0024406 issued in 2019.
Permit Limits Modified Limits (SOC)
Parameter Monthly Daily Monthly Daily
Average Maximum Average Maximum
Total Arsenic 10.0 µg/L 340.0 µg/L Monitor& 340.0 µg/L
Report
Chlorides 250.0 mg/L 250.0 mg/L Monitor&Report
Sulfates 250.0 mg/L 250.0 mg/L Monitor&Report
Total Cadmium 0.59 µg/L 3.24 µg/L MoRmtort& 3.24 µg/L
Total Selenium 5.0 µg/L 56.0 µg/L Monitor& 85.0
Report µg/L
Chronic Toxicity Ceriodaphnia P/F @ 90% Ceriodaphnia Full Range
Testing—Monitor Only
Total Thallium 2.0 µg/L 2.0 µg/L MR°ep or& 4.0 µg/L
rt
Because the concentrations of pollutants in the Lined Retention Basin discharge are
currently unknown, for the purpose of future considerations,the minimum monitoring
frequencies for all parameters monitored at NPDES permit Outfall 003A,with the
exception of Chronic Toxicity, shall be increased to Weekly during its first six months of
operation.

EMC SOC WQ S18-009
Duke Energy Carolinas,LLC
p. 6
(h) During the time in which this Special Order by Consent(SOC)is effective,Duke
Energy shall comply with the effluent limitations for Outfall 111 contained in NPDES
permit NC0024406 unless modified below:
Under this SOC,only the parameters listed below for Outfall 111 have been modified
from the NPDES Permit NC0024406 issued in 2019.
Permit Limits Modified Limits (SOC)
Parameter Monthly Daily Monthly Daily
Average Maximum Average Maximum
pH >6.0&<9.0 Std.Units >5.0&< 10.0 Std.Units
Total Mercury 12.0 ng/L 12.0 ng/L 47.0 ng/L(Annual Average)*
Total Cadmium 0.59 µg/L 3.24 µg/L 2.0 µg/L 3.24 µg/L
Chlorides 250.0 mg/L 250.0 mg/L Monitor&Report
Total Dissolved Solids 500.0 mg/L 500.0 mg/L Monitor&Report
*Calendar Year
(i) During the time in which this Special Order is effective,the following Interim Action
Levels shall be established within the UT to the Dan River receiving discharges from
Outfalls 003, 003A and 111, from the Outfall 003/003A discharge location to the
confluence of the UT with the Dan River:
Characteristic Interim Action Level
pH** 5.0— 10.0 standard units
Cadmium 3.24 µg/L
Chlorides** 700.0 mg/L
Arsenic 25.0 µg/L
Mercury** 0.1 µg/L
Hardness** 800.0 mg/L
Selenium " 56.0 µg/L
Total Dissolved Solids 1,700.0 mg/L
Sulfates 700.0 mg/L
** Interim Action Levels are the same as those as established in EMC SOC WQ S18-004.

EMC SOC WQ S18-009
Duke Energy Carolinas,LLC
P. 7
3. Duke Energy agrees that unless excused under paragraph four(4), Duke Energy will pay
the Director of DWR,by check payable to the North Carolina Department of Environment
and Natural Resources, stipulated penalties according to the following schedule for failure
to meet the deadlines set out in paragraphs 2(a) and 2(b),the interim limits found in
paragraphs 2(f),2(g) and 2(h), or the interim action levels listed in paragraph 2(i).
Violation Description Stipulated Penalty
Failure to meet a schedule date listed in paragraphs $500 per missed schedule date within the first
2(a)(1)—2(a)(3) or 2(b)(1)—2(b)(2) seven(7)days of tardiness; $750 per day
thereafter.
Failure to submit progress reports as required by $500/day
paragraph 2(c).
Failure to maintain compliance with any modified
limit contained in the Special Order $2,000/violation
Failure to maintain compliance with any interim
action level contained in the Special Order $4,500/violation
Failure to eliminate discharge from Outfall 003 by $200,000.00+$3,000.00 per each day beyond 30
September 30, 2020. days following deadline until discharge from
Outfall 003 is eliminated
Failure to eliminate discharge from Outfall 003A $200,000.00+$3,000.00 per each day beyond 30
by September 30, 2020. days following deadline until discharge from
Outfall 003A is eliminated
Failure eliminate discharge from Outfall 111 by $200,000.00+$3,000.00 per each day beyond 30
September 30, 2020. days following deadline until discharge from
Outfall 111 is eliminated
4. Duke Energy and the Commission agree that the stipulated penalties specified in
paragraph 3 are not due if Duke Energy satisfies DWR that noncompliance was caused
solely by:
a. An act of God;
b. An act of war;
c. An intentional act or omission of a third party,but this defense shall not be
available if the act or omission is that of an employee or agent of Duke Energy or
if the act or omission occurs in connection with a contractual relationship with
Duke Energy;
d. An extraordinary event beyond the Duke Energy's control, specifically including
any court order staying the effectiveness of any necessary permit or approval.
Contractor delays or failure to obtain funding will not be considered as events
beyond Duke Energy's control; or
e. Any combination of the above causes.

EMC SOC WQ S18-009
Duke Energy Carolinas,LLC
p. 8
5. Failure within thirty(30) days of receipt of written demand by DWR to pay the stipulated
penalties, or challenge them by a contested case petition pursuant to G.S. 150B-23,will
be grounds for a collection action, which the Attorney General is hereby authorized to
initiate. The only issue in such an action will be whether the thirty(30)days has elapsed.
6. Noncompliance with the terms of this Special Order is subject to enforcement action in
addition to the above stipulated penalties, including,but not limited to injunctive relief
pursuant to G.S. 143-215.6C.
7. This Special Order and any terms or conditions contained herein,hereby supersede any
and all previous Special Orders (with the exception of EMC SOC WQ S 18-004),
Enforcement Compliance Schedule Letters,terms, conditions, and limits contained
therein issued in connection with NPDES permit NC0024406. In the event of an NPDES
permit modification or renewal, any effluent limit of monitoring requirements contained
therein shall supersede those contained in this Special Order by Consent, except as
modified and contained in paragraphs 2(f), 2(g) and 2(h) above.
8. This Special Order maybe modified at the Commission's discretion,provided the
Commission is satisfied that Duke Energy has made good faith efforts to secure funding,
complete all construction, and achieve compliance within the dates specified. In
accordance with applicable law,modification of this Special Order will go to public
notice prior to becoming effective.
9. In addition to any other applicable requirement, each report required to be submitted by
Duke Energy under this Special Order shall be signed by a plant manager or a corporate
official responsible for environmental management and compliance, and shall include the
following 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.
10. This Special Order shall become effective in accordance with state law, and once
effective,Duke Energy shall comply with all schedule dates,terms, and conditions
herein.

EMC SOC WQ S18-009
Duke Energy Carolinas,LLC
p. 9
This Special Order by Consent shall expire on December 31,2020.
Fear e Energy Carolinas, LLC:
40//// 10/0
—` — t�
Pau Drao ' ch Date
Senior Vie President,Environmental, Health& Safety
For the North Carolina Environmental Management Commission:
Linda Culpepper, Director Date
N.C. Division of Water Resources
For the Chair of the Commission

ATTACHMENT A
EMC SOC WQ S18-009
Duke Energy Carolinas,LLC-Belews Creek Steam Station
INTERIM EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
(Outfall 003-normal operations/decanting)
During the period beginning on the effective date of this Special Order and lasting until September 30,2020,
Duke Energy is authorized to discharge from Outfall 003 -Ash Settling Basin(decanting the free water above
the settled ash layer that does not involve mechanical disturbance of the ash). Such discharges shall be
limited and monitored by the Permittee as specified below.Note that conditions for only those parameters
indicated in Bold have been modified from the terms of NPDES permit NC0024406.
EFFLUENT CHARACTERISTIC LIMITS MONITORING REQUIREMENTS
Monthly Daily Measurement Sample Type Sample Location
Average Maximum Frequency
Flow,MGD Monitor&Report Weekly Pump logs or Effluent
estimate
Oil and Grease1 15.0 mg/L 20.0 mgiL Monthly Grab Effluent
Total Suspended Solids1.7 30.0 mg/L 50.0 mg/L Monthly Grab Effluent
Total Arsenic,NgIL 75.0 pg/L 340 0 pg/L Monthly Grab Effluent
Chlorides Monitor&Report Monthly Grab Effluent
Sulfates 250.0 mg/L 250.0 mg/L Monthly Grab Effluent
Total Ironic 1.0 mg/L 1.0 mg/L Monthly Grab Effluent
Total Copper1° 1.0 mg/L 1.0 mglL [ Monthly Grab Effluent
Total Aluminum 6.5 mg/L 6.5 mg/L Monthly Grab Effluent
Total Cadmium 0.59 pg/L 3.24 pg/L Monthly Grab Effluent
Total Selenium 25.0 pg/L 56.0 pg/L Monthly Grab _Effluent
Total Zinc, pg/L Monitor&Report Monthly Grab Effluent
Total Chromium,pg/L Monitor&Report Monthly Grab Effluent
Total Dissolved Solids,mg/L Monitor&Report Monthly Grab Effluent
Total Silver, pg/L Monitor&Report Monthly Grab Effluent
Fluoride,mg/L Monitor&Report Monthly Grab Effluent
Total Phosphorus,mg/L Monitor&Report Monthly Grab Effluent
Total Nitrogen(NO2+NO3+TKN),mglL Monitor&Report Monthly Grab Effluent
Chronic Toxicity2 See footnote Quarterly Grab Effluent
pH3.8 See footnote 2/Month Grab Effluent
Bromides,mg/L Monitor&Report Monthly Grab Effluent
Total Lead 2.94 pg/L 75.48 pg/L Monthly Grab Effluent _
Total Thallium _ 2.0 pg/L 2.0 pg/L __ Monthly Grab Effluent
Total Mercury4,ng/L Monitor&Report Monthly Grab Effluent
Turbidity6,NTU See footnote Weekly Grab Effluent
Total Hardness,mg/L Monitor&Report _ Monthly Grab Effluent
Ammonia9 1.0 mg/L 5.0 mg/L Variable Grab Effluent
Notes:
1. Monitoring for TSS,oil and grease and all toxicants shall be performed concurrently with the Chronic Toxicity test.
2. Whole Effluent Toxicity shall be monitored through full range chronic toxicity(Ceriodaphnia)testing
(parameter code THP3B). See Attachment D of this SOC for details.
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. The facility shall employ method 1631E.
5. Please See Special Condition A.(23.)of NPDES permit NC0024406.
Attachment A,p. 1

ATTACHMENT A
EMC SOC WQ S18-009
Duke Energy Carolinas,LLC—Belews Creek Steam Station
6. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the instream
turbidity exceeds 50 NTU due to natural background conditions,the discharge cannot cause turbidity to increase in the
receiving stream. Therefore,if the effluent measurement exceeds 50 NTU,the Permittee shall sample upstream and
downstream turbidity in the receiving waterbody,within 24 hours,to demonstrate the existing turbidity level in the
receiving waterbody was not increased.All data shall be reported on the DMRs.(See 15A NCAC 2B .0211 (21)).
NTU-Nephelometric Turbidity Unit.
7. The facility shall continuously monitor TSS concentration when the decanting process commences and the decanting
pump shall be shutoff automatically when one half of the Daily Maximum limit(15 minutes average)is exceeded.
Pumping will be allowed to continue if interruption might result in a dam failure or damage.The continuous TSS
monitoring only required when the pumps are employed for decanting.
8. The facility shall continuously monitor pH when the decanting process commences and the decanting pump shall be
shutoff automatically when the 15 minutes running average pH falls below 6.1 standard units or rises above 8.9
standard units.Pumping will be allowed to continue if interruption might result in a dam failure or damage. The
continuous pH monitoring is only required when the pumps are employed for decanting.
9. Ammonia limit and monitoring is only applicable in the event of the emergency release of anhydrous ammonia.The
sampling should be commenced as soon as possible after the release considering personnel safety and every hour
thereafter until the sampling indicate no discharge of ammonia.
10. The limit applies only when the chemical metal cleaning waste is being discharged to the basin.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Outfall sampling shall be conducting prior to the commingling with wastewater from Outfall 003A.
The facility is allowed to drawdown the wastewater in the ash pond to no less than three feet above the ash. The
rate for lowering the liquid level in a coal ash pond shall not exceed one(1)foot per day unless a higher rate is
supported to the satisfaction of DEMLR and in accordance with NCAC,Title 15A, Subchapter 2K.
The facility shall use a floating pump suction pipe with free water skimmed from the basin surface using an
adjustable weir.The limits and conditions in Section A. (4.)of the permit apply when water in the ash settling
basin is lowered below the three feet trigger mark.
By November 1,2018 there shall be no discharge of pollutants in fly ash transport water.This requirement only
applies to fly ash transport water generated after November 1,2018.
•
By May 31,2021 there shall be no discharge of pollutants in bottom ash transport water.This requirement only
applies to bottom ash transport water generated after May 31,2021.
The facility shall notify via e-mail DWR Complex NPDES Permitting Unit and DWR Winston-Salem Regional
Office seven calendar days prior to the commencement of the decanting.
In accordance with the N.C.G.S. § 130A-309.210,by December 31,2019,the facility shall convert to the
disposal of dry bottom ash, as defined in the Coal Ash Management Act("CAMA").
Attachment A,p. 2

ATTACHMENT B
'EMC SOC WQ S18-009
Duke Energy Carolinas,LLC—Belews Creek Steam Station
INTERIM EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
(Outfall 003A—Lined Retention Basin)
During the period beginning upon the commencement of operation of the new Lined Retention Basin and lasting
September 30,2020,Duke Energy is authorized to discharge from Outfall 003A(new lined retention basin).
Such discharges shall be limited and monitored2 by the Permittee as specified below.Note that conditions for
only those parameters indicated in Bold have been modified from the terms of NPDES permit NC0024406.
EFFLUENT CHARACTERISTIC LIMITS MONITORING REQUIREMENTS Monthly Daily Measurement
Average Maximum Frequency7 Sample Type Sample Location
Flow,MGD Monitor&Report Weekly Instantaneous Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Quarterly Grab Effluent
Total Suspended Solids 30.0 mg/L 50.0 mg/L Quarterly Grab Effluent
pH3 See footnote Weekly Grab Effluent
Total Arsenic,pglL Monitor& 340.0 pg/L Quarterly Grab Effluent
Report
Total Mercury1,nglL Monitor&Report Quarterly Grab Effluent
Total Selenium Monitor& 85.0 pg/L Monthly Grab Effluent
Report
Nitrate/nitrite as N,mg/L Monitor&Report Quarterly Grab Effluent
Chlorides Monitor&Report Monthly Grab Effluent
Sulfates Monitor&Report Monthly Grab Effluent
Total Nickel, pg/L Monitor&Report Quarterly Grab Effluent
Fluoride,pg/L Monitor&Report Quarterly Grab Effluent
Total Barium,mg/L Monitor&Report Quarterly Grab _ Effluent
Total Chromium,pg/L Monitor&Report Quarterly Grab Effluent
Total Cadmium pg/L Monitor& 3.24 pg/L Monthly Grab Effluent
Report
Total Hardness,mg/L Monitor&Report Quarterly Grab Effluent
Total Coppers 1.0 mg/L 1.0 mg/L Monthly Grab Effluent
Total Lead 2.94 pg/L 75.48 pg/L Monthly Grab Effluent
Total Thallium Monitor& 4.0 pg1L Monthly Grab Effluent
Report
Chronic Toxicity4 See footnote Quarterly Grab Effluent
Ammonia5 1.0 mg/L 5.0 mg/L Daily Grab Effluent
Total Iron6 1.0 mg/L 1.0 mg/L Quarterly Grab Effluent
Notes:
1. The facility shall employ method 1631E.Monitoring for TSS,oil and grease and all toxicants shall be
performed concurrently with the Chronic Toxicity test.
2. Please See Special Condition A. (23.)of NPDES permit NC0024406.
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. Whole Effluent Toxicity shall be monitored through full range chronic toxicity(Ceriodaphnia)testing
(parameter code THP3B). See Attachment D of this SOC for details.
5. Ammonia limit and monitoring is only applicable in the event of the emergency release of anhydrous
ammonia.
6. The limit applies when the chemical metal cleaning waste is being discharged to the basin.
Attachment B,p. 1
N

ATTACHMENT B
EMC SOC WQ S18-009
Duke Energy Carolinas,LLC—Belews Creek Steam Station
Outfall 003A Footnotes,continued
7. The monitoring frequency for all parameters,with the exception of Chronic Toxicity,shall be Weekly
during the first six months of operation(discharge)of the Lined Retention Basin treatment system.
The facility shall submit EPA Form 2C for this Outfall within 2 years of commencement of the discharge.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Outfall sampling shall be conducting prior to the commingling with wastewater from Outfall 003.
Attachment B, p. 2

ATTACHMENT C
EMC SOC WQ S18-009
Duke Energy Carolinas,LLC—Belews Creek Steam Station
INTERIM EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Outfall 111
During the period beginning on the effective date of this Special Order and lasting until September 30,2020,
Duke Energy is authorized to discharge from Outfall 111 —Toe Drain Discharge. Such discharges shall be
limited and monitored) by the Permittee as specified below.Note that conditions for only those parameters
indicated in Bold have been modified from the terms of NPDES permit NC0024406.
EFFLUENT CHARACTERISTIC LIMITS MONITORING REQUIREMENTS
Monthly Daily Measurement Sample Sample
Average Maximum Frequency2 Type Location
Flow,MGD Monitor&Report Monthly/Quarterly Estimate Effluent
pH3 See Footnote Monthly/Quarterly Grab Effluent
TSS 30.0 mg/L 100.0 mglL Monthly/Quarterly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly/Quarterly Grab Effluent
Fluoride,mg/L Monitor&Report Monthly/Quarterly Grab Effluent
Total Mercury4,ng/L 47.0 ng/L(Annual Average)* Monthly/Quarterly Grab Effluent
Total Barium,mg/L Monitor&Report Monthly/Quarterly Grab Effluent
Total Zinc,pg/L Monitor&Report Monthly/Quarterly Grab Effluent
Total Arsenic 10.0 pg/L 340.0 pg/L Monthly/Quarterly Grab Effluent
Total Boron,pg/L- Monitor&Report Monthly/Quarterly Grab Effluent
Total Cadmium,pg/L 2.0 pg/L 3.24 pg/L Monthly/Quarterly Grab Effluent
Total Chromium, pg/L Monitor&Report Monthly/Quarterly Grab Effluent
Total Copper, pg/L Monitor&Report Monthly/Quarterly Grab Effluent
Total Thallium Monitor&Report Monthly/Quarterly _ Grab Effluent
Total Lead, pg/L Monitor&Report Monthly/Quarterly Grab Effluent
Total Nickel,pg/L Monitor&Report Monthly/Quarterly Grab Effluent
Total Selenium 5.0 pg/L 56.0 pg/L ,Monthly/Quarterly Grab Effluent
Nitrate/nitrite as N,mg/L Monitor&Report _ Monthly/Quarterly Grab Effluent
Sulfates,mg/L Monitor&Report Monthly/Quarterly Grab Effluent
Chlorides Monitor&Report Monthly/Quarterly Grab Effluent
TDS,mg/L Monitor&Report Monthly/Quarterly Grab Effluent
Total Hardness,mg/L Monitor&Report , Monthly/Quarterly Grab Effluent
Temperature,°C Monitor&Report Monthly/Quarterly Grab Effluent
Conductivity,pmho/cm Monitor&Report Monthly/Quarterly Grab Effluent
Notes:
1. Please See Special Condition A. (23.)of NPDES permit NC0024406.
2. The facility shall conduct monthly sampling from the effective date of the permit.After one year from the
effective date of the permit the monitoring will be reduced to quarterly.
3. The pH shall not be less than 5.0 standard units nor greater than 10.0 standard units.
4. The facility shall employ method 1631E.
*Calendar Year
If no discharge occurs during the reporting period or the Permittee is unable to obtain a representative sample
due to low-flow conditions at the seep,the Permittee shall submit its DMR, as required, and indicate"No Flow"
for the seep(15A NCAC 02B .0506(a)(1)(E)).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Attachment C,p. 1

ATTACHMENT D
EMC SOC WQ S18-009
Duke Energy Carolinas,LLC—Belews Creek Steam Station
Full Range Whole Effluent Toxicity Monitoring(Ceriodaphnia Dubia)
Duke Energy shall perform full range Whole Effluent Toxicity Monitoring of the effluent discharges from
both Outfall 003 and Outfall 003A,using Ceriodaphnia dubia as a test species.
The chronic value for multiple concentration tests will be determined using the geometric mean
of the highest concentration having no detectable impairment of reproduction or survival and the
lowest concentration that does have a detectable impairment of reproduction or survival. The
definition of"detectable impairment," collection methods, exposure regimes, and further
statistical methods are specified in the"North Carolina Phase II Chronic Whole Effluent
Toxicity Test Procedure" (Revised-December 2010)or subsequent versions.
Duke Energy shall perform at a minimum,quarterly monitoring using test procedures outlined in
the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-
December 2010) or subsequent versions. The tests will be performed during the months of
February,May,August, and November. These months signify the first month of each three
month toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be
obtained during representative effluent discharge and shall be performed at the NPDES permitted
fmal effluent discharge below all treatment processes.
All toxicity testing results required as part of this SOC condition will be reported using the
eDMR system,for the months in which tests were performed using the parameter code THP3B
for the Chronic Value. Additionally,DWR Form AT-3 (original)is to be sent to the following
address:
Attention: North Carolina Division of Water Resources
Water Sciences Section
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later
than 30 days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate,include all supporting chemical/physical measurements
and all concentration/response data, and be certified by laboratory supervisor and ORC or
approved designate signature. Total residual chlorine of the effluent toxicity sample must be
measured and reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity
monitoring is required,the permittee will complete the information located at the top of the
aquatic toxicity(AT)test form indicating the facility name,permit number,pipe number, county,
and the month/year of the report with the notation of"No Flow" in the comment area of the ,
form. The report shall be submitted to the Water Sciences Section at the address cited above.
Attachment D,p. 1

ATTACHMENT D
EMC SOC WQ S18-009
Duke Energy Carolinas,LLC—Belews Creek Steam Station
Should the permittee fail to monitor during a month in which toxicity monitoring is required,
monitoring will be required during the following month.Assessment of toxicity compliance is
based on the toxicity testing quarter,which is the three month time interval that begins on the
first day of the month in which toxicity testing is required by this permit and continues until the
final day of the third month.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival,minimum control organism reproduction, and appropriate
environmental controls, shall constitute an invalid test and will require immediate follow-up
testing to be completed no later than the last day of the month following the month of the initial
monitoring.
Attachment D,p. 2