NC0004987_Application_20210519

(� DUKE
�' ENERGY.
January 5, 2021
Sergei Chemikov, PhD
North Carolina Department of Environmental Quality
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Marshall Stearn station
NPDES Permit NC0004987
NPDES permit modification request
Dear Dr. Chemikov:
Marshall Steam Statton
8320 East NC Nrghway 50
Terrell, NC 28682
Duke Energy requests that NPDES permit # NC0004987 be modified to incorporate
recently modified steam electric Federal Effluent Guidelines (40 CFR Part 423).
It is requested that purge water from the bottom ash handling system be permitted as a
contributing wastewater source to outfall 005. Purge water from the bottom ash
submerged flight conveyer (SFC) handling system will primarily be directed to be used
for FGD makeup water when available but, as allowed in the modified rule in
accordance with 40 CFR 423.13(k)(2)(i)(A), this purge water may be released to the
lined retention basin for treatment and then discharged through outfall 005 as needed to
maintain water system chemistry and/or water balance. In accordance with the updated
federal effluent guideline rule, a 30-day rolling average SFC purge water flow volume of
0.098 MGD is requested to be added to the permit based on a calculated bottom ash
system volume of 0,983 million gallons. Duke Energy requests that this be added as a
special condition.
Additionally, Duke Energy requests for internal outfall 006 that the amended
concentration limits for FGD wastewater found in the modified rule be incorporated into
the permit. Those limits are as follows with changes from current permit limits
highlighted:
Pollutant
Arsenic
Mercury
Selenium
Nitrate/Nitrite
Existing monthly average/daily
max
8 ug/I and 11 /ug/I
356 ng/I and 788 nq/1
12 ug/I and 23 uq/1
4.4 mg/I and 17 mg/I
Modified Rule monthly
average/daily_max
Bug/land 18ug/I 1
34 ng/I and 103 nag/1
19 uq/I and 70 ug/I
3 mg/land 4 m /1

Dr. Sergei Chemikov
North Carolina Department of Environmental Quality
Division of Water Resources
January 5, 2021
Duke Energy request the pH limits at internal outfall 006 be removed. The pH of the
wastewater is adjusted as needed later in the treatment process and prior to
discharging from the final outfall 005. This change is consistent with other Duke Energy
permits where pH was removed from internal outfalls. Internal outfall 006 is subject to
the Federal Effluent Guidelines 40 CFR 423 and these guidelines do not include pH.
Attached is a check for $1,030 in order to process this modification request. If you have
questions, please contact Robert Wylie at [phone] or Robert.Wylie@duke-
energy.com.
Sincerely,
a?f
Rick Roper, General Manager III
Marshall Steam Station
cc: .Robert Wylie via email
Scott La Sala
Shannon Langley — via email

0A2157
7
DUKE ENERGY BUSINESS SERVICES LLC
400 5 TRYON STREET
ACCOUNTS PAYABLE • ST25B
CHARLOTTE. NC 28202
000004 R3K1SDA
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
1617 MAIL SERVICE CENTER
RALEIGH NC 27699-1617
�� NERGY
Remittance Advice
Date:
Check #:
Payment Amount:
Vendor #:
Page 1 of 1
01/05/2021
1000185573
1,030.00
0000071949
Invoice Date
Invoice #
Voucher ID #
Invoice Gross Amt
Discount Amount
Invoice Net Amt
01/04/2021
010420211030
11588139
1,030.00
0.00
1,030.00
PLEASE DETACH BEFORE DEPOSITING CHECK
THIS CHECK CONTAINS MULTIPLE FRAUD DETERRENT SECURITY FEATURES
DUKE ENERGY BUSINESS SERVICES LLC
400 5 TRYON STREET
ACCOUNTS PAYABLE ST25B
CHARLOTTE, NC 28202
Pay Exactly `*One Thousand Thirty and 00/100 -US Dollars**
TO THE
ORDER ENVIRONMENTAL QUALITY
OF
NORTH CAROLINA DEPARTMENT OF
, JP MORGAN CHASE BANK, N A
SYRACUSE, NY 13206
1
50-037/2l3
Date: 01/05/2021
Check #: 1000185573
A thorized Signer
II'MO0L8557310 I:02/309379i:
6❑ L84656 L1u'

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SHISERTTGEI CHERNIKOV, PHD
NCDEQ
1617 MAIL SERVICE CENTER
DIVISION OF WATER RESOURCES
RALEIGH NC 27699-1600
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