NC0003433_Application_20200202

?� DUKE Cape Fear Steam Electric Plant
" ENERGY: tvloncure, Road
curNNCC 2T559
February 20, 2020
Ms. Julie Grzyb
North Carolina Department of Environmental Quality
Division of Water Resources, Complex Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Duke Energy Progress, LLC
Cape Fear Steam Electric Plant
NPDES Permit Modification NPDES Permit
NC0003433
Chatham Count
Dear Ms. Grzyb:
Duke Energy Progress, LLC (Duke Energy) submits this letter to request modification of
the NPDES permit for Cape Fear Steam Electric Plant to add an emergency spillway at
the inactive 1963/1970 ash basin. This request is to support compliance with the North
Carolina Department of Environmental Quality (NCDEQ) Dam Safety's new regulations
for ash basin dams in North Carolina passed in April 2019. The request is in follow up to
discussions between Duke Energy and NCDEQ water quality and dam safety staff on
August 21, 2019 and Duke Energy and Division of Water Resources on November 7,
2019.
The ash basin is currently scheduled for decommissioning; however, prior to
decommissioning, the ash basin is required to contain and safely pass a design storm
event consistent with federal and state regulations. The current regulatory design storm
has been updated from 1/z Probable Maximum Flood, PMF, to the full PMF. The PMF
equates to 27.50-inches of rainfall in a 6-hour period
In order for the combined 1963/1970 inactive ash basins to safely pass the full PMF, a
new auxiliary emergency overflow spillway is required to be constructed to release
stormwater to the Cape Fear River. The proposed spillway is designed to maintain 1-foot
of freeboard within the basin at a minimum crest of 183 ft. Additionally, the spillway is set
at an elevation sufficient to ensure that the basin will contain 100-year, 24-hour storm
without discharge. The emergency spillway will be located on the southwest comer of
the 1963 ash basin (Lat: 35034'57.37" / Long:-79002'57.50" adjacent to Outfall 008A.
Duke Energy requests an emergency spillway be added to the NPDES permit with
discharge to the Cape Fear River. As this outfall would only discharge in an extreme
weather event and would consist primarily of rain that has fallen on the footprint of the
inactive ash basin, we request that sampling be waived in the event of a discharge as

(� DUKE
ENERGY.
Cape Pear Steam Electric Plant
500 CPBL Road
Moncure, NC 27559
conditions are unsafe. During conditions where sampling is achievable, samples of the
same basin water discharge at adjacent Outfall 008A, located approximately 150 feet
away, can easily characterize the discharge.
Enclosed for your consideration in support of this request are the following:
1. Map of proposed emergency spillway;
2. Design Drawings;
3. A check in the amount of $1030.
Should you have any questions regarding this submittal or require additional
information, please contact Joyce Dishmon at [phone] or email
[e-mail].
1 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. 1 am aware that there are significant penalties
for submitting false information, including the possibility of fines and imprisonment for
knowing violations.
Sincerely,
Issa J. Zarzar
General Manager — East Region
CCP Operations and Maintenance
Cc: Scott Vinson, NC DWR,
Water Quality Regional Office,
3800 Barrett Drive, Raleigh, NC 27608
Shannon Langley via email
Joyce Dishmon (filenet) via email
Jonathan Stamas via email

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CFR C901.031.004 REV. 2
NOTES:
F
I \ \ \\\ \ \ \\\ \\\\ \ \\\\\\ \\\\\\ \ \ \ \\ /
3
\\\ I \\\\ \\\ \\\\\\\ \\ \ \
N\
\0\
\\
\\\\ \
LIMITS OF 1963/1970 ASH BASIN BOUNDARY / I
W 29 -V
LOD/6/ t P11 1 too
\ \\ PROPERTY LINE �\ \ \�\\ \ \ - L4o // tQD
169
\ \\\ \ \ \\\ \\\ \ \\\ \ \� \ 39I\\ 24\ // o � 1 I I oo-, SOD \\ TOE OF SLOPE
\\ \\ EXISTING DAM CREST - - _ _ _ - \ / �����-�P12,� _ \
\ \ \
1970 ASH BASIN
LIMITS OF PROPOSED GRADE (TYP.)
1.
TRUCK TURNAROUND IS INTENDED TO BE TEMPORARY, FOR
CONSTRUCTION PURPOSES ONLY. AREA TO BE RESTORED TO
PRE -CONSTRUCTION GRADES AND PERMANENTLY STABILIZED
PRIOR TO REMOVAL OF EROSION AND SEDIMENT CONTROL
MEASURES.
2.
ADD 4-INCH THICK LAYER OF #4 AGGREGATE TO MAKE TURN
AROUND AREA LEVEL FOR TRUCKS TO DO A 3-POINT TURN.
3.
TURN AROUND AREA DIMENSIONS BASED ON THE SIZE OF A DUMP
TRUCK.
4.
THE PREPARED SUBGRADE SHALL BE PROOF ROLLED WITH AT
LEAST 2 PASSES OF A 20-TON LOADED DUMP TRUCK OR 1 PASS OF
A 40-TON LOADED ARTICULATED TRUCK. PROOF ROLLING SHALL
BE CONDUCTED AT THE DIRECTION OF THE CQA ENGINEER OR HIS
REPRESENTATIVE. ANY SOFT, SATURATED OR YIELDING AREAS
EXHIBITED BY PUMPING AND/OR RUTTING WILL REQUIRE REMOVAL
AND REPLACEMENT WITH THE APPROPRIATE COMPACTED SOIL AS
SPECIFIED.
5.
TREES WITHIN THE LIMITS OF DISTURBANCE LINE TO BE REMOVED.
(SEE SHEET CFR.C901.030.010) FOR POINT LIST TABLE)
6.
ALL TREES LESS THAN 3 IN. IN DIAMETER AT BREAST HEIGHT MAY
BE REMOVED EITHER BY EXCAVATION OR CUTTING FLUSH TO THE
GROUND. (SEE SHEET CFR.C901.030.009 FOR TREE REMOVAL
DETAIL)
7.
ALL TREES LARGER THAN 3 IN. IN DIAMETER AT BREAST HEIGHT
_
MUST BE COMPLETELY REMOVED BY EXCAVATION, INCLUDING
\
ROOTS, AND THE RESULTING EXCAVATION PROPERLY BACKFILLED
WITH SELECT FILL. (SEE SHEET CFR.C901.030.009 FOR TREE
REMOVAL DETAIL)
LQD
/ 14253- -
261 _,�_6265 qD
17
CAPE FEAR RIVER \\\ \ / 1\ \ 4 INCH SACRIFICIAL \ P13 _ _ //� � _ 6 - - - - - _ = - - - - - - - - - - - _- - _ - -
1 �\ ���� `' 4 2�_ - - - _--- ------ - - _ - - ° --z _ _ EXISTING DAM CREST _- - _ _ -- ,�
\\\ \ I I LAYER OF #4 / �= _ - 262 2�� _ ----- --_--------- _ ---_-
\\ \ 111 \ \� / \ \ �- - ----------� - - ---_ --_
1 - = ---- ---_-_----------------------_-- _= __----________________=_
AGGREGATE FOR \ \ � `=' , C ��oo � � 260 � �� ���_ _ _ _ _
/ ACCESS 256-- �5- -- --� _ �--------- -- ---- ----------------
NPDES OUTFALL 008A / I o \ \ \ \ \ �7 ^�� 2 259 277 -- P9 _ _ _ _ -_- _ _ _ _ 3_�_ ,� _ - _ _ _ _-_ -_ -
EXISTING 32" HDPE OUTFALL I 1 1 I I l \�� ` \ \ \\ 7o _ - - = 185 - - - - - _ - _ _ - _ - _ _ -_
PIPE (TO REMAIN IN PLACE) I 1 I < < \ \ \ \ \ \ \ s P14 - _ _ _ _ _ _
^o 0270 av 278 ! 292r 29
226I b302 305
\ \ \\\ \ \ III \ l \\ \\ \ \ \ \ \ 2 4
85
288 _ 2----- - s5' - - - - - - - - - - - - - _
\ \ \\ \ \ \ \ \ \ 221 10 - 2`' 91 307 3
� 1 2 83 g � 284 287, / � _185- _ - - - 306 - - - - - - - = EXISTING ACCESS ROAD- - - - - - - - - - - - -
\ 1 ------
\\ A\ �'1\b �\\� P15 2� / P7 `�290_---- -�---- o _ _---------- ------------
\�\����\\�`\ �2-37
� �\ �� I / /-- --- -T06 LOD----LOD LOD LOQ- ---------
\ 3
\ \ \ \ \ \ 220 - = _ _ --LAB _ _ _ _ - - -
\ P16 29 7 171 2+00 2�10 / -- T- -- - - - -----
EXISTING WELLS PROTECT -IN -PLACE \ \\ \\ \\ \ \ �o \�\ \\ \ - P17 1 76 167 16 / C'
\ \ 165
��\ \ / / --------_
W L� \ \ \\ \ \ -185- / / / / 6
----------------------------
p
P6 ' - - - -180 91 0 F TOpYq F 1 �� - I /�
\\ ELLM� '�� ���� ens _
wo-�� "
P18 _----------- _-- _ 50 - - - - CO
CD
\\\ \ - __ __ _ - -
\ \ \ \ 6208 P19 P4--= ___= =--82_ --- -___---____---- O
\\ ,\/� 183 147 / �� _ - - - _ GJ
\ \ , \ i \ �/ 2�1 � 14 P3 / 87 ---- --__
D152 �88 0 - - - - C)
84
I19 P20 192 189 \ \ \ \ \ - \1 J P2 00 99 `,� 17 8 3
19� �� \ P1 132 128 09582 o° PROPOSED TEMPORARY
138 \ � / 98
9 TURN AROUND AREA
1 � 407 \ � \ 142 \ `96 \
°° 14� 1 / 977 18 // (SEE NOTES 1-4) m
1 101 / E 17 /
\ \ \ \\ \ Ol0 \ \ �\ DOl 078 N
\ oOl QOl 102 3 \ 37/ 9\
\� B, \ 77 �5\ \
POINT TABLE
POINT NO.
NORTHING
EASTING
ELEVATION
P1
666890.25
1985372.60
171 FT.
P2
666894.75
1985376.09
171 FT.
P3
666907.48
1985379.01
171 FT.
P4
666917.63
1985381.08
171 FT.
P5
666939.96
1985385.63
184 FT.
P6
666940.27
1985396.85
185 FT.
P7
666981.17
1985434.97
187 FT.
P8
666999.17
1985441.67
187 FT.
P9
667001.71
1985432.21
186 FT.
P10
667032.25
1985432.46
175 FT.
P11
667061.32
1985318.53
176 FT.
P12
667035.80
1985289.36
185 FT.
P13
667015.24
1985247.75
187 FT.
P14
6677000.17
1985235.81
187 FT.
P15
666969.10
1985237.34
185 FT.
P16
666961.14
1985246.41
184 FT.
P17
666952.40
1985249.43
181 FT.
P18
666924.84
198524.05
168 FT.
P19
666902.29
1985208.21
165 FT.
P20
666893.47
1985212.80
165 FT.
P21
666905.62
1985248.51
167 FT.
INCHES 1 2 3 TENTHS 10
EXISTING MAJOR CONTOURS
EXISTING MINOR CONTOURS
WOOD LINE
- WATER SURFACE
PAVED PATH
UNPAVED PATH
LIMITS OF ASH BASIN BOUNDARY
100YR FP ZONE AE FLOODPLAIN LIMIT
PROPOSED RIP -RAP AUXILIARY
i OVERFLOW EMERGENCY
SPILLWAY
PROPOSED MAJOR CONTOURS
PROPOSED MINOR CONTOURS
SACRIFICIAL LAYER OF #4
AGGREGATE
- LIMITS OF PROPOSED GRADE
MONITORING WELLS
LOD LIMITS OF DISTURBANCE
234 EXISTING TREE
20 30
103 39 / 1610�J� \\ \\
104 073 G \i \
SEE NOTES 5-7 \ $ 072 38 1 / \ _ _
,� INSET A PROPOSED RIP RAP
\ �106 109 40�
\\ 127 105 71 �15 "I' AUXILIARY OVERFLOW SPILLWAY
GlO 41 43 �
074 ,\SCALE. 1 - 20
\ G
J 108 69 2 G4 0' G14 20 0 20 40 FT
118
\ G68 G47 45 �lr�� 13
\ y119 / TITLE 1963/1970 BASIN
��" qS§
7 G48 8 wood. AUXILIARY OVERFLOW SPILLWAY DESIGN S 117 G112 G64 CAPE FEAR STEAM STATION F-
\ Environment & Infrastructure Solutions t-% A AM COUNTY NORTH CAROLIKIA
116
\ `113 G65
\ \ ` 12(y 115 49 1
\ \\ o \\ 62 G5
\ � G121 \ \ `56
`124
\ \ \ \ \ \ ��57
�55 �1�44
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558 $
\ \ \ \ 40l 5 00l Cr 40l 001
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REV DATE JOB NO. PROJECT TYPE DES DFTR CHKD ENGR APPD DESCRIPTION
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4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM
INC 27703 TEL: [phone] RIP -RAP AUXILIARY SPILLWAY PLAN
FAX: [phone]
INC ENGSF-11253 FOR ISSUED FOR PERMITTING
INC GEOLOGY: C-247
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CFR C901.031.005
REV. 2
1 SEE
SPILLWAY CROSS-SECTION
�O5DETAIL
PROPOSED AUXILIARY OVERFLOW
2 RIP RAP SPILLWAY
SPILLWAY
.005 ANCHOR DETAIL
200.00
200.00
STA: 0+81.80 STA: 0+98.71
190.00
STA:0+44.50
ELEV.182.50 ELEV.
STA:1+22.78
190.00
EXISTING
ELEV:183.00
- - - - - - - - - - - - - -
ELEV:182.00 EXISTING GRADE
/
75, GROUND
180'0�
0 YR FP
_
_
1.4% SLOPE
\ 2
180'0�
\
!S
SURFACE
(TYP.)
�FP
STA:0+11.84
4 INCH SACRIFICIAL LAYER OF #4 AGGREGATE
�
\ 100 FP 100YR T A:1+74.52
A
170.00
ELEV:176.02
- - ����ELEV.167.45
170.00
160.00
160.00
- I T I -r I-f-l1
T- I T I -r /
-
/i I�
� 2
RIP -RAP LIMITS-
Q
1
2
ICI
T 1
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I
(DEPTH
150.00
150.00
I
I
�� �
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I _
_ 10, 1 VARIES
I 1.5' TO 4'
-0+10 0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70 0+80 0+90 1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10
SECTION VIEW--
(
HORIZONTAL SCALE..��
1 =20�
2+20
_�m��i
TIFI_
O
,_
- -I
,
II - CLASS BRIP-RAP
I� III ,i
- I III- _3'
VERTICAL SCALE: 1 "=20'
SEE SPILLWAY
CROSS-SECTION
1
16 OZ/SY GEOTEXTILE�-
DETAIL
005
\
/
CLASS 2 RIP -RAP
IIII-III'
200.00
200.00
-
STA:0+77.67 STA:0+94.99
PROPOSED AUXILIARY
B
N
-
-� 190.00
srA:o+34.96
ELEV.182.44 ELEV:182.18
STA:1+10.02 OVERFLOW SPILLWAY
190.00 -�
1 SPILLWAY
CROSS-SECTION
B
0
ELEV.
YR FP
- - - - - - - - - - _
' -
ELEV.182.00
EXISTING GRADE
�O5 qrnl F N T
z 180.00
1.4% SLOPE
2
180.00 Z
Q
_ _
100YR 100YR FP
Q
Q 170.00
STA: +07.64
4 INCH SACRIFICIAL LAYER OF #4 AGGREGATE
STA:1+63.96
- - - - - - ELEV.169.49
170.00 Q
o
>
ELEV.175.36
-------
>
CLASS BRIP RAP
W
W
J
W 160.00
J
160.00 W
_
RIP -RAP LIMITS
16 OZ/SY GEOTEXTILE
N
150.00
150.00
o
-0+10 0+00
0+10 0+20 0+30
0+40 0+50 0+60 0+70 0+80 0+90 1+00 1+10
1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90
2+00 2+10
EXISTING GROUND
SURFACE (TYP.) I- APRON WIDTH 10' PER PLAN
C
20
0 20
40 FT
SECTION VIEW (B-B')
�1,-I_-F T-7
1T1 7 r I n
C
HORIZONTAL SCALE: 1 "=20'
1 II ' '
II I1 1=
VERTICAL SCALE: 1 "=20'II
4' I- -
189.00
189.00
I =
STA: 0+10.43
ELEV:187.12
188.00
188.00
sTA:1+99.8
RIP RAP SPILLWAY ANCHOR
�
�
ELEV.186.5
2
EXISTING GRADE
�O5 SCALE: N.T.S.
187.00
------__
187.00
O
186.00
1
PROPOSED AUXILIARY
/ 186.00
/ 1
CO
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EMERGENCY SPILLWAY
10
�
10
u-
185.00
-
185.00
U-
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PMF DEPTH =
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184.00
i
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183.00
183.00
i
100'
182.00
182.00
2-FT THICK CLASS B RIP -RAP
TITLE 1963/1970 BASIN
O O
O O O O
4" SACRIFICIAL LAYER OF #4
AGGREGATE FOR ACCESS
O
AUXILIARY OVERFLOW SPILLWAY DESIGN
ood
W
CAPE FEAR STEAM STATION
F
181.00
STA:0+57.29
181.00
En%ironment& Infrastructure Solutions CHATHAM COUNTY, NORTH CAROLINA
F _
ELEV.182.46
STA:1+55.32
ELEV.182.29
4021 STIRRUP CREEK DRIVE,, SUITE 100 DURHAM
NC 27703
TEL: [phone] CROSS SECTION & PROFILE
O
FAX: [phone]
FOR
NCENGSF-11253 ISSUED FOR PERMITTING
180.00
180.00
INC GEOLOGY: C-247
0+00
0+10
0+20 0+30
0+40 0+50 0+60 0+70
0+80 0+90 1+00 1+10
1+20
1+30
1+40
1+50 1+60 1+70 1+80
1+90 2+00 2+10
SEAL ' j I SCALE: AS SHOWN DES: VRD
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REV
DATE
JOB NO. PROJECT TYPE DES DFTR CHKD ENGR
APPD DESCRIPTION
[TENTHS 10 20 30
4
5
6
7
8 9 10
INCHES 1 2 3