NC0004961_Submittal Required by Permit Condition A_20170303

15 DUKE
ENERGYe
February 27, 2017
Mr. Jeffrey O. Poupart, Section Chief
Water Quality Permitting Section
North Carolina Division of Water Resources
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Subject: Submittal Required by Permit Condition A.(16)
Riverbend Station
NPDES Permit NC0004961
Gaston County
Dear Mr. Poupart:
Duke Energy
Riverbend Station
175 Steam Plant Rd
MAC? _ F "";'/
Watp,i Quality
Pem 4iv' g Section
Pursuant to Part 1, Condition A.(16) of the subject permit Duke Energy is required to 1) determine if
jurisdictional seeps identified in the permit as outfalls 101, 103, 104, 106,107, 109, 110, 11 and 112
meet the applicable water quality standards set forth in 15A NCAC 28.200; and 2) demonstrate that
non -jurisdictional seeps Identified as outfalls 105 and 108 will not cause violation of water quality
standards in the receiving stream. The determination of each of these items is required within 90 days
of the effective date of the permit. Outfall 102 is exempt from condition A.(16) pursuant to Special
Order by Consent No. S16-005. This submittal fulfills the requirements of condition A.(16) of the
subject permit.
Only three of the above named outfalls had measurable flow so that representative samples could be
collected. The outfalls with measured flow were outfall 102, outfall 104 and outfall 108. This is due in
large part to the activities undertaken by Duke Energy and authorized by the Department of
Environmental Quality to lower the water levels in the ash basin in an effort to mitigate seepage and
begin the process of closure. A summary of sampling results obtained in December 2016, January 2017
and February 2017 is provided with this submittal. These results confirm that outfalls 104 and 108 meet
the water quality standards. Outfall 102 exceeds the water quality standard for hardness. The hardness
in outfall 102 is most likely a result of inputs from natural sources, given that the water in the ash basin
does not exceed the hardness standard. As referenced above, outfall 102 is not subject to Condition
A.16 under the Special Order by Consent. Outfall 102 meets the interim hardness limits set fort in the
Special Order by Consent. Duke Energy has agreed to address water quality in outfall 102 actor ing to
the terms and schedule set out in the Special Order by Consent for Riverbend.
As required by the permit, Duke Energy will conduct monitoring for the parameters specified in permit
conditions A.(21.), A.(22.), A.(23.), A.(24.), A.(25.), A.(26.), A.(27.), A.(28.), A.(29.), A.(30.), A.(31.) and
A.(32.), as modified by the Special Order on Consent.

If you have any questions, please contact Brad Loveland at [e-mail] or 704-609-
5637.
"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 fines and imprisonment for knowing violations."
Sincerely,
Tim Hill
General Manager
CCP Regional Operations and Maintenance
Riverbend
Cc: Richard Baker(Duke Energy)
Brad Loveland (Duke Energy)
Rick Massey(Duke Energy)
Shannon Langley—Mail Code NC-15
Wes Bell—MRO
610 East Center Avenue,Suite 310
Mooresville, NC 28115

Riverbend Steam Station - Permit Conditions A.(16) Demonstation
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u/L
r - NIL `
r5L` -�n /L
'mk
CCaCO3
e Cunhos/cmm/L
ApplicableISA NUC 28Standards__
6.09.0
12.0_ _
,_ ,1.0.
10.0
25:0'
250.0' °250�.0� �_
500.0 �
100.0_;
OUTFALL 101
12/9/2016
No Sample Collected (No Flow)
OUTFALL 101
1/16/2017
No Sample Collected (No Flow)
OUTFALL 101
2/1/2017
No Sample Collected (No Flow)
OUTFALL 102
12/9/2016
7.0 <5 <5 <0.1
0.679
0.029 0.028 0.888
<0.005 <1
<1
<1 <1 <1
1.24
<1
1 6.5
61 4.9
170
121
10.4
277
OUTFALL 102
1/16/2017
6.5 <5 <5 <0.1
1.24
0.038 0.373 1.32
0.01 <1
<1
<1 1.4 <1
1.93
<1
4.1
68 5.4
170
113
12.1
270.2
OUTFALL 102
2/1/2017
7.0 <5 <5 <0.1
1.08
0.035 0.534 0.989
0.007 <1
<1
<1 <1 <1
1.19
<1
4
64 4.7
180
109
13
251.5
OUTFALL 103
12/9/2016
No Sample Collected (No Flow)
OUTFALL 103
1/16/2017
No Sample Collected (No Flow)
OUTFALL 103
2/1/2017
No Sample Collected (No Flow)
OUTFALL 104
12/9/2016
No Sample Collected (No Flow)
OUTFALL 104
1/16/2017
No Sample Collected (No Flow)
OUTFALL 104
2/1/2017
6.7 1 13 1 <5 1 <0.1
2.45
0.045 1.31 0.726
0.007 <1
<1
<1 <1 <1
4.13
<1
0.36
46 5.1
110
60.1
15.8
162.5
OUTFALL 105
12/9/2016
No Sample Collected (No Flow)
OUTFALL 105
1/16/2017
No Sam le Collected (No Flow)
OUTFALL 105
2/1/2017
No Sample Collected (No Flow)
OUTFALL 106
12/9/2016
No Sample Collected (No Flow)
OUTFALL 106
1/16/2017
No Sample Collected (No Flow)
OUTFALL 106
2/1/2017
No Sample Collected (No Flow)
OUTFALL 107
12/9/2016
No Sample Collected (No Flow)
OUTFALL 107
1/16/2017
No Sample Collected (No Flow)
OUTFALL 107
2/1/2017
No Sample Collected (No Flow)
OUTFALL 108
12/9/2016
7.0 <5 <0.1
1.12
0.017 2.25 0.025
<0.005 <1
<1
<1 <1 <1
<1
<1
<0.1
0.91 2.5
27.7
8.3
85.1
OUTFALL 108
12/13/2016
<5
78
OUTFALL 108
1/16/2017
6.1 <5 <5 <0.1
0.967
0.016 1.87 0.046
<0.005 <1
<1
<1 <1 <1
<1
<1
<0.1
0.91 _ 2
63
23.7 1
11.8
43.3
OUTFALL 108
2/1/2017
7.1 <5 <5 <0.1
0.876
0.015 2.19 0.036
<0.005 <1
<1
<1 <1 <1
<1
<1
0.15
1.4 2.3
89
21.7
13.3
69.5
OUTFALL 109
12/9/2016
No Sample Collected (No Flow)
OUTFALL 109
1/16/2017
No Sample Collected (No Flow)
OUTFALL 109
2/1/2017
No Sample Collected (No Flow)
OUTFALL 110
12/9/2016
No Sample Collected (No Flow)
OUTFALL 110
1/16/2017
No Sample Collected (No Flow)
OUTFALL 110
2/1/2017
No Sample Collected (No Flow)
OUTFALL 111
12/9/2016
No Sample Collected (No Flow)
OUTFALL 111
1/16/2017
No Sample Collected (No Flow)
OUTFALL 111
2/1/2017
No Sam le Collected (No Flow)
11
OUTFALL 112
12/9/2016
No Sample Collected (No Flow)
OUTFALL 112
1/16/2017
No Sample Collected (No Flow)
OUTFALL 112
2/1/2017
No Sample Collected (No Flow)
*Total Hardness requirement is 200mg/I in accordance with Special Order of Consent #EMC SOC WQ S16-005