NC0003468_Correspondence_20220715

Strickland, Bev
From: Dishmon, Joyce Martin <[e-mail]>
Sent: Friday, July 1, 2022 10:34 AM
To: Chernikov, Sergei
Cc: Winston, Cynthia C; Milam Jr., William E; Newcomb, Dana H; Carroll, Gary B
Subject: FW: [EXTERNAL] Dan River Draft
Attachments: Cliffside Therma.pdf
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Sergei,
Per our conversation, it is DRCC's understanding that the following changes will be made to the draft:
1. I met with the site to discuss a safe location for collecting the monthly downstream temperature. The
location identified on the Google Earth Snapshot is approximately 85 feet downstream of outfall 001,
meets the mixing zone of the river, and allows safe access to the river. After 12 months of data
collection, DRCC may request the sampling frequency be changed from monthly to quarterly.
2. A footnote will be added to the Temperature (effluent - DRCC) to refer to A(6) Thermal Mixing Zone
and the language in Condition A(6) will be updated to mirror Cliffside's Thermal Mixing Zone in
Condition A(27)..
3. Footnote #2 will be removed due to the language refers to the conditions from the former Steam
Station.
1

Thank you for your consideration. Please let me know if you have questions/comments or require additional
information.
Regards,
Joyce Dishmon
Duke Energy
Permitting and Compliance
864 S. Edgewood Road
Eden, NC 27288
Office: 336-623-0238
Cell: 336-394-5524
Email: [e-mail]
2

Permit No. NC0005088
A. (6.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B .0400 et seq., 02B
.0500 et seq.]
During the period beginning upon commencement of discharge from the new WWTS and lasting until permit
expiration, the Permittee is authorized to discharge from outfall 005 - WWTS. Such discharges shall be limited and
monitored' by the Permittee as specified below:
Effluent Characteristics
Discharge Limitations
Monitoring Requirements
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample
Location2
Flow (MGD)
Continuous
Recorder3
E
Oil and Grease
15.0 mg/L
20.0 mg/L
2/Month
Grab
E
Total Suspended Solids
30.0 mg/L
50.0 mg/L
2/Month
Composite
E
Total Copper
251.0 µg/L
272.0 µg/L
See Note 4
Grab
E
Total Iron
1.0 mg/L
1.0 mg/L
See Note 4
Grab
E
Total Chromium
0.2 mg/L
0.2 mg/L
Monthly
Grab
E
Total Zinc
1.0 mg/L
1.0 mg/L
Monthly
Grab
E
Chronic Toxicity5
Quarterly
Composite
E
Total Nitrogen
(NO2+NO3+TKN)
Quarterly
Composite
E
Total Phosphorus
Quarterly
Composite
E
pH
6.0 to 9.0 S.U.
2/Month
Grab
E
Total Residual Chlorine6
28 µg/L
2/Month
Grab
E
BOD, 5-day, 20° C
30.0 mg/L
45.0 mg/L
Monthly
Composite
E
Fecal Coliform (geo. mean)
200/100 mL
400/100 mL
Monthly
Grab
E
Hardness -Total as
[CaCO3 or (Ca + Mg)] mg/L
Quarterly
Grab
E, U
Temperature?
100 °F
Weekly
Grab
E
Temperature
Quarterly
Grab
U, D
Total Selenium$, µg/L
Monthly/Weekly
Grab
E
Total Cadmium$, µg/L
Monthly/Weekly
Grab
E
Total Mercury$-9, ng/L
Monthly/Weekly
Grab
E
Total Arsenics, µg/L
Monthly/Weekly
Grab
E
Total Leads, µg/L
Monthly/Weekly
Grab
E
Total Thalliums µg/L
Monthly/Weekly
Grab
E
Total Bromides, µg/L
Monthly/Weekly
Grab
E
Total Molybdenums, µg/L
Monthly/Weekly
Grab
E
Total Dissolved Solidss ,mg/L
Monthly/Weekly
Grab
E
126 pollutants contained in
chemicals added for cooling
tower maintenance (except
Total chromium and Total
Zinc)
No detectable amounts 10
Annual
Grab
E
Page 12 of 29

Permit No. NC0005088
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system. See Special Condition A. (28.).
2. Sample Locations: E - Effluent from treatment system prior to mixing with other sources of wastewater, U -
upstream at the Station Intake, and D- at least 476 feet from the discharge.
3. Flow may be measured by pump logs.
4. Monitoring shall be per occurrence of chemical metal cleaning and sample shall be from a representative
discharge.
5. Chronic Toxicity (Ceriodaphnia) P/F at 3.14%; March, June, September, and December; See Special Condition
A. (11) of this permit.
6. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the
permit. However, the permittee shall continue to record and submit all values reported by a North Carolina
certified laboratory (including field certified), even if these values fall below 50 µg/L. Neither free available
chlorine (FAC) nor TRC may be discharged from any single generating unit for more than two hours in any
single day, and not more than one unit in the plant may discharge FAC or TRC, unless the discharger
demonstrates to the Division that the unit(s) cannot operate at or below this level of chlorination.
7. See Special Condition A. (27.) Temperature Mixing Zone.
8. Monthly monitoring is required during normal operations and decanting, weekly monitoring during
dewatering.
9. The facility shall employ method 1631E.
10. Limitations and monitoring requirements for the 126 Priority Pollutants (per 40 CFR Part 423, Appendix A,
exclusive of zinc and chromium) apply only if these substances are added by the permittee for cooling tower
maintenance. Compliance with the limitations for the 126 priority pollutants in 40 CFR 423.13 (d)(1) may be
determined by engineering calculations which demonstrate that the regulated pollutants are not detectable
in the final discharge by the analytical methods in 40 CFR Part 136. All primary industries are required to
submit a priority pollutant analysis in accordance with 40 CFR Part 122 with their application for permit
renewal.
Within 180 days of the commencement of operations of the treatment system the permittee shall submit Items V
and VI of NPDES application Form 2C.
All domestic wastewater produced at the power plant is to be fully treated through the onsite wastewater treatment
system prior to being discharged.
The permittee shall obtain authorization from the Division prior to using any biocide in the cooling water; see
condition A. (20.).
There shall be no discharge of floating solids or foam visible in other than trace amounts.
See Special condition A. (29.) Notification of Start-up.
Page 13 of 29

Permit No. NC0005088
Electronic version (CD and PDF) and hard copy:
DWR Water Science Section
1623 Mail Service Center
Raleigh, NC 27699-1623
Electronic version only (CD and PDF):
WQ Permitting Section - NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
Pursuit to 40 CFR 125.98 the Director has determined that operating and
recirculating system meets the requirements for an interim BTA.
Nothing in this permit authorizes take for the purposes of a facility's
Act.
maintaining
compliance
A. (25.) APPLICABLE STATE LAW (State Enforceable Only) [NCGS 143-215.1(b)]
the existing Closed -cycle
with the Endangered Species
This facility shall meet the General Statute requirements under NCGS § 130A-309.200 et seq. This permit may be
reopened to include new requirements imposed under these Statutes.
A. (26.) ASH POND CLOSURE
The facility shall prepare an Ash Ponds Closure Plan. This Plan shall be submitted to the Division one month prior
to the closure of the ash ponds.
A. (27.) TEMPERATURE MIXING ZONE - OUTFALL 005 [G.S. 143-215.3(a)(2)]
a) The temperature mixing zone is defined as the area extending from outfall 005 to approximately 145 meters (476
feet) downstream and 37 meters (121 feet) wide. The discharge shall not result in acute toxicity to aquatic life,
prevent free passage of aquatic organisms around the mixing zone, result in offensive conditions, produce
undesirable aquatic life or result in a dominance of nuisance species outside of the assigned mixing zone; or
endanger the public health or welfare.
b) The temperature standard of 32°C (89.6°F) and the maximum temperature increase above natural temperature of
2.8°C (5.04°F) shall be met at the end of the mixing zone. The natural water temperature shall be the temperature
measured at the upstream sampling location. The increase in temperature is defined as the difference in
temperature between the upstream and downstream sampling locations.
c) The results of all temperature monitoring shall be reported in the monthly DMRs. When possible, instream
monitoring for temperature shall be performed during times the facility is operating at full loading.
d) After 12 months of temperature data are collected the permittee shall submit a report to the Division to verify the
Cormix model predictions. The report shall include field verification of assumptions used in the model and a
summary of temperature data for effluent, upstream and downstream and shall be submitted to:
Division of Water Resources
WQ Permitting Section - NPDES
Page 24 of 29