NC0004979_Application Update_20180312

DUKE Paul Draovitch
Senior Vice President
E N E RGY, Environmental,Health&Safety
526 S.Church Street
Mail Code:EC3XP
Charlotte,NC 28202
[phone]
March 12, 2018
Sergei Chernikov, Ph.D.
NCDEQ Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: AOW S-10 Designation RECEIVEDIDENR/DWR
Duke Energy Carolinas, LLC. MAR 1 6 2018
Allen Steam Station
Permit#: NC0004979 Water Resources
Gaston County Permuting Section
Dear Dr. Chernikov,
Duke Energy Carolinas, LLC (Duke) submits the following updated information in reference to
AOW S-10, contrary to details in the November 29, 2017 Allen Steam Station NPDES
Wastewater Permit Application Update.
We request an update in AOW S-10 designation as an engineered feature due to the
configuration of the French drain conveyance system currently in operation. The system
originates at the North Dike of Cell 1, collecting seepage from the North Dike toe, terminating at
the concrete vault at the head of an existing drainage channel, and ultimately collected and
pumped back to Cell 1. Please find a copy included of the previously submitted drawings
depicting the engineered feature. On February 8th, a DEQ staff member photographed the
engineered feature and can provide copies. Duke Energy requests that S-10 be included in the
permit as it is an engineered featured.
Should you have any questions regarding this letter or require additional information, please
contact Ms. Elizabeth Glenn at [phone] or at [e-mail].
"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."

Since ly,
/Or
Paul DrKovitch
SVP - Environmental, Health & Safety
Enclosures

rc----\
GENERAL NOTES:
g AS-BUILT CONDITIONS
1. BACKGROUND TOPOGRAPHY IN AREA OF TRANSMISSION TOWER FROM o Ili
DRAWING ENTITLED"SITUATION AND TOPOGRAPHIC SURVEY FOR NORTH DIKE pp
OF ASH BASIN",MAP 002096-376571,DATED AUGUST 26,2009,SURVEYED BY = 8
o '41 t
STEWART FOR DUKE ENERGY. TOPOGRAPHY AND INFORMATION BEYOND ,II
a
TRANSMISSION TOWER AREA FROM A VARIETY OF DRAWINGS BY DUKE
ENERGY. FIT BETWEEN TOPOGRAPHIC INFORMATION IS APPROXIMATE AND NI a�s
•
SHOULD BE FIELD VERIFIED. -
EXISTING 36"CMP d I
2. TRANSMISSION TOWER INFORMATION FROM SEVERAL DRAWINGS PROVIDED BY 1 o EXISTING SEDIMENT INVERT=617.0 GEOTECHNICAL NOTES: o
DUKE ENERGY INCLUDING BETHLEHEM STEEL COMPANY SHEET E207 TITLED 90° b
ANGLE&DEAD END TOWER AND UNTITLED TOWER SECTION DRAWING. / --- bNb BASIN#3 THESE NOTES ARE INTENDED TO PROVIDE SOILS
1115
_ (FORMER RISERS REMOVED , INFORMATION AND ESTABLISH CERTAIN QUALITY
3. AS-BUILT CONDITIONS BASED ON FIELD OBSERVATIONS AND DOCUMENTATION NEW NORTH DRAINAGE DITCH AND // ///i REQUIREMENTS ONLY-CONTRACTOR IS RESPONSIBLE
DURING CONSTRUCTION.AS-BUILT SURVEY INFORMATION PROVIDED BY / /// // -- BY DUKE ENERGY) EXISTING RCP FOR CONSTRUCTION MEANS AND METHODS. F
EARNHARDr GRADING,INC. FRENCH DRAIN OUTLET(I.E.622.01). , / / - F
/ // INVERT=615.7
IL B,DRAWING 3 /// /j/j///'- ,` _ I btib 624 SITE PREPARATION FOR THE NEW WEST DITCH LINE
4. FIT BETWEEN BACKGROUND AND AS-BUILT SURVEY INFORMATION IS - - _ - / ./ // /�/ - '-_ / ` OF EXISTING TREES,
SHOULD INCLUDE THE REMOVAL
APPROXIMATE. _ `-_ - / 1-a 622 STUMPS,ROOTS,SURFACE VEGETATION,AND TOPSOIL I ,.
S DTA
I s
-_,` i b / -' ` - - - 62 VOIDS REMAINING FROM STUMP REMOVAL SHOULD BE lyl f
'--" // /// -- - FILLED WITH COMPACTED FILL. DURING CLEARING AND :f' €_ 2
EXISTING 36"CMP - b / STRIPPING,AREAS THAT ARE FOUND SOFT OR UNSTABLE ti
622 INVERT=617.3 "b� - - - SHALL BE UNDERCUT AND REPLACED WITH COMPACTED J
6p 0, FILL.
- - - bti EXISTING RCP TREES AND STUMPS MAY BE DISPOSED OF ON THE ALLEN 2
TOPO VARIES IN THIS EXISTING 14"HDPE INVERT=615.7 STEAM STRPEY A LOCN E
"� AREA DUE TO EXISTING SCRUBBER BLOW DOWN LINE b DETERMINED ATION BY PDUOKE ENERGY.RTAT NO BURNINGATIOTO WILL BE� L
.yo
AND EXISTING 6"HDPE ALLOWED UNLESS APPROVED BY DUKE ENERGY. 2
SOIL STOCKPILES - W
STORM WATER LINE. - / FILL SOILS(INCLUDING FRENCH DRAIN TRENCH BACKFILL)
626...
5 , \ '-- AND GENERAL FILL IN THE AREA OF THE TRANSMISSION
EXISTING 15"HOPE PIPE /' TOWER)COMPRISED THE BALANCE OF ON-SITE SOILS 1
//\\ - (USCS-CL)AND SOILS IMPORTED FROM THE ALLEN STEAM
1 - - INVERT=623.75 ` /�- -1/r- \ f ) I ,_-. STATION SOIL BORROW AREA(USCS-ML). DUKE AND S&ME Z
b"SCHEDULE 80 SOLID PVC OUTLET=623.61 / ) _ AGREED TO USE THE SOILS AVAILABLE FROM THE ALLEN
UNDER ROADWAY(40 FEED / \ 1 ( STEAM STATION SOIL BORROW AREA,SAMPLED AS ML FOR 3 s 5
/ I THIS PROJECT.
SCARP REPAIR. \ \
SEE FRENCH DRAIN PROFILE 1 SEE DETAIL E, j \
AND DETAIL A,DRAWING 3 N DRAWING 3. - - /-- \ ( FILL SOILS SHOULD BE PLACED IN RELATIVELY THIN LIFTS
o b /,// / \ \ \ \ ) ) _, (NOT EXCEEDING 8 INCHES LOOSE)AND COMPACTED. "a E 1
\ - - /n. / \ \ 1 1 6 ONLY MECHANICAL HAND TAMPS WILL BE ALLOWED IN �,�
N G RO A� _ /, J/// \' \ , 1 /`--- TOWER FOOTPRINT. @a �
IE Ctn6 f.. EXTS�N /// ///>\ / \\ \ \ , / TRENCH BACKFILL SOILS SHOULD BE COMPACTED TO AT 4°1f
EXISTING BOLLARDS(TYP). \
�- /\ Q/�� //// ( \ \ ` _._.-- LEAST 95%OF THE SOILS STANDARD PROCTOR MAXIMUM
14"SCRUBBER BLOW-DOWN LINE AND I / \ /,../... '--�/ \\ ,\\ �- - -- DRV DENSITY AT 3t PERCENT OF OPTIMUM MOISTURE
6"STORMWATER LINE / / %/ v \ \ N_-- _-- CONTENT.ALL OTHER FILL MAY BE COMPACTED TO 92%
BELOW GRADE BETWEEN BOLLARDS. ___ '// / \ \___--- __-- STANDARD PROCTOR AT LIKE MOISTURE CONTENT. 5 5
- --.......--C--*-----'
� - /- //'f 1�` - DUKE ENERGY WILL PROVIDE FOR QUALITY CONTROL -
-. - - -. -628 - _. _ 20 `.;.}" _ ._ - -ill-
__ / / I
N.
_ TESTING OF FILL SOILS.V 3 5 -
-630 - _ Of 6 .. _630 __ __ _-ill: I - �// \\�� ) a_ _ _ - b �" � _ ----- - i��� \ TOWER EFO AND ING NSTA S AR PREOVIIDED RE CTIVE TO (!
9 / 111111 3 TO
/ I 5' - - --"' CONTRACTOR
- -- � •, 1 IS RESPONSIBLE FOR CONSTRUCTION AND EXCAVATION 1
- - 62.71.E.624.53 elli
- - SAFETY.
/� \ DUKE ENERGY SPOTTER IS REQUIRED DURING ALL WORK A i)
i H i
3, . / - \ ) WITHIN 25 FOOT TOWER EXCLUSION ZONE. $;� 1 ma il p
3q \ ) --/ CONTRACTOR IS RESPONSIBLE FOR REVIEWING TOWER !WIN
6 \ -�) / - FOUNDATION INFORMATION PROVIDED SEPARATELY FROM 111111 a
63n a NEW FRENCH DRAIN,CLEAN-OUTS,AND PROTECTIVE BOLLARDS \ / / THIS SET OF THREE(3)DRAWINGS. ANY APPARENT 6 131 I
636 y? �v BETWEEN CO#1 AND CO#6(PROFILE I AND DETAIL A,DRAWING 3) \ / / - CONFLICTS,BEFORE OR DURING CONSTRUCTION,MUST i f i
O c c� \ \\ I / BE BROUGHT TO THE ATTENTION OF DUKE ENERGY AND
- o .� ( S&ME IMMEDIATELY.
AO - o CURRENTLY INACTIVE ASH BASIN CELL 1 \\ \\ ( ( RELATIVELY SHALLOW GROUNDWATER(0 TO 4 FEET S ��
63, WATER LEVEL HELD NEAR ELEVATION 635± / \ I \ I I BELOW GROUND SURFACE)SHOULD BE ENTIRE FRENCH DRAIN INSTALLATION ROUTECTED ALONG
CO#4
3 EXISTING ,.i.E.6
z5.44 ) ( I 0 z•
TRANSMISSION / I DEWATERING FOR FRENCH DRAIN INSTALLATION MAY BE Z W ❑
TOWER 6 LINES ! CONSTRUCTION WITHIN TOWER PROXIMITY DISPOSED OF INTO INACTIVE ASH BASIN CELL 1. 0 i F
ALL DISTURBED SOIL EXIST' I�� COMPLETED BY USING JERSEY BARRIERS AROUND I I <@ i
SURFACES SEEDED ' TRANSMI55 •N- ��,� TOWER LEGS AND SHAPING GRADES BENEATH TOWER 1 THE FRENCH DRAIN EXCAVATION(BETWEEN CO#1 AND 0 5 0.71
R AND STABILIZED 4 \ I 1 CO#6)SHOULD BE SHORED CONTINUOUSLY DURING
WITH NORTH ,o w ,OWER FOUND •OHS �,�� �� WITH SMALL MECHANICAL EQUIPMENT. DUKE ENERGY w a 4
AMERICAN GREEN e N (TY'.,4 PLACES) .I•.Fo#3 SPOTTER WAS PRESENT DURING ALL ACTIVITIES IN EXCAVATION WITH NO MORE THAN 4-FOOT VERTICAL o F
2 SC15o i IE 625.93 UN-SHORED AT ANY GIVEN TIME. NO MORE THAN 20-FEET m c m
Si c .�� / PROXIMITY OF TOWER. - HORIZONTAL SHOULD BE OPENED AND NOT BACKFILLED ❑P z F
d
2 LE 62�oe q® /IE 62614 / I ANY GEOTEXAT ANY TILE TIME. OVERLAPS SHOULD BE 2 Z f <❑
_______ ______� II Z
_ - - ° ° ®�- - I INCHES MINIMUM.FABRIC4 <o O F
0 Z
- - __ : __ , _ CONTRACTOR IS ADVISED TO PROTECT EXISTING 2 1 z,
640- - _ -
.._642_. ------ OBSERVATION WELLS AND PIEZOMETERS(5 PLACES). Z" W m
... ...6.{4-- OF OW-21 Y
-- - -- _ ROUTE OF FRENCH DRAIN AND/OR DISPOSITION
$ --- _--- eas A.PN2D WILL BE A FIELD DECISION COLLABORATED WITH B a 2
E �NGFf76HTOR AN5,11I55zpN�NES DUKE ENERGY. GRAPHIC SCALE - �/MR :
t - _
EXISTING PIEZOMETERS AND WELLS(TIP,3 PLACES). - ,,w•....
S- DUKE REPORT No. -""
d;
ASR-UNITS 1-5-2011-0001-000

FRENCH DRAIN, 4'OSTEEL BOLLARD PAINTED CRETESAFETY YELLOW
x e
63,�j 1 CO2 C 0 3 C 0 4 C 0 5 C 0 6 OUTLET _ SET IN AND FILL WITH CONCRETE a°},
" 6_ Jj 6a'. �` /� & ,- - TYPICAL ARRANGEMENT OF FOUR SHOWN AT CLEANOUTS COAL AND CO86,
CLEANOUTS, •
E A N O U T S, SEE PLAN FOR ALTERNATE ARRANGEMENT AT CLEANOUTS CON2,CO83.CO84,S CONE n p
i)37 0 I... _ ___ 30'x 30'x 8'CONCRETE SURFACE PAD Z ._
7 Z - -- -- - 631 BOLLARD DETAILS WITH NEENAH FOUNDRY R-8018 HEAVY DUTY COVER ..�[E
633 W _ _. __.__ SCALE:NONE ij "
- _. —— 633 C x
N ADS PIPE SPECIFICATIONS: i
r p�, G,.- ADS PIPE-SINGLE WALL HIGHWAY PIPE _-__ • v I,
�3i OF _. — — "" 632 (SEE ADS SINGLE WALL PIPE SPECIFICATIONS) 111!!1JOINTS FITTINGS-OUTSIDE SNAP OR SPLIT COUPLINGS . NOTE: Fj
L y' INSTALLATION-PER ADS INSTALLATION GUIDE AND CONE. 8s
63 i ___y 631 4, 4 BOLLARDS PERDUKE
I.
3 BOLLAUTS COR2,UKE3,AND CON4: 1 S 1
130 3 BOLLARDS PER DUKE .71
636 - -- ' ,�\- — — -- — ] 630 1
62 ' -- 1'-- .... _.__...__..__.__ 629 '\ ` e `+ Mil
/ FABRIC A STONE I \\ j Perforations Pattern Type B s 1r
6.20 °3° __- ____.L_._. �...__ __— --I ____ ____ .___. __.-__ __-—__! 628Par ADS Technical Note 6' _ _ al t
L' u ' \ P Slot Length=0.875"
o ` to
..... - F--17.,`97,4,0
As C � Slot Width=0.1211' CLEANOUT PROTECTION
27 .).e ....—_ _ _._...___. +� i.. .\ __... ._.._.. .__._._. _._ bac,� Inlet Area=tin'per foot ca 2
X26 tiT7 -.F 3 Slot Pattern Perforations Rotated 60°Every , 2± 9�
I_
\N other Valley = 2
FABRIC A ETONE�S(PERDRA' Ru.4 HIGHWAY - \\\ 626 ADS&PIPE
PERFO RATIONSSPECIFICATIONS I I �II�r=` VI 1
625 +— lOt
DCO �EEX\ TING Iln"n ,=U I
�= 80 1NI^- RCN aG PVC *' \\ I DRAISNAGE 625 6'CLEANOUT m IITII 1E-11
IIIIILI y
r /J -"AGR SWAY - DITCH 03 WITH PLUG °"' i
•62T ...._._. _...... __. .. .... ___. .._.
_.._.. _...._. __ __ s... � s OVERLAP(MIN) - . I
N 2
NOTE:
!
AS-BUILT
PROV PROVIDEDPROFILE
BVINFORMATION
HARDT GRADBASED
ING,SNC.EYANPOINTS SEE CLEANOUT NE B NE DETAILS Aso D�'80)4S R FABRIC A STONE 8 fe� I=I_I I:I I II-7 �A II Th— I r 3 3 3
L)23 INTERPOLATION BETWEEN THOSE POINTS. .--_ FOR ..—.._.—__. ... o,,lr TO �HGHW ,I -- 623 ' - NON-WOVEN G O I L4. '1r( '71-=-7"1
,1 _,•`L,°,�I�. =[I] ILi_I 111111 'q $ �
..___.. -I =aE TEXT LE '
TRANSITION(S) A✓p/PE � NCDOT SIZE S STONE K �' �' (::. ,
(MIRAF1140N ORIrp8.4E EL n EEE, 1
622 622 OFe APPROVED EQUAL) WASHED STONE
�)g
_. _. _...........—_._....__.. ____ - _ -___..._ ...._... -_�( �I _._. g y ;,Yki i HIGHWAY PIPE
(PERFORATEO)WALL Z6'ADS PERFORATED PIPE :.� �1 CLE ON OSLOPE
UT DETAIL $ g
)21 C N 36" e., WASHED STONE { p 9999
�1I� 62/ 9999 L
TRANSMISSION TOWER LEGS
FOUNDATIONS(BEYOND) 6 20 CDH 7 TO cD#6
��YY-- FRENCH DRAIN DETAIL CLEANOUT DETAIL (TYP UND)
FRENCH DRAIN PROFILE ���������� Q *FT -_
SCALE:AS SHOWN
O 3 3 3 1
SIMILAR K
TRANSITION
MIRAFI 600X GEOTEXTILE(OR APPROVED EQUAL)UNDERNEATH RIP-RAP FROM PVC E ADS p Willy
EXCAVATE IN-PLACE NEAR EL 6241;AVOID DAMAGING PIPE 6'ADs ON OTHER w
NCDOT CLASS RIP-RAP FRENCH DRAIN DETAIL CLEANOUT SIDE OF ROAD O p
ENCAPSULATE PIPE OUTLET WITH BETWEEN EL 622t AND 6241 BEYOND C O#6 PLUG 1D 4 g(,
PVC PIPE SPECIFICATIONS: ;'�;��
11-INCH HARDWARE CLOTH
EXTEND 12 INCHES BACK ONTO PIPE PIPE- ASTM D1785-06 - �; _ _ T i!
SECURE WITH PIPE CLAMPS(2 MINIMUM) FITTINGS-ASTM D2467-06 - II If I —
deb Q
S 4' JOINTS-GLUED ASTM D2855-96(2010) w N If a�.
O SOLVENT CEMENT-ASTM D2564-04(2009)el c 6 as EL--•621 ■ 6'ADS AS-BUILT 110110igql :
`�O O - •• :•. PVC PIPE NCDOT 512E6STONE
6'ADS HIGHWAY PIPE(SOLID) WASHED
STONE
ED PIPE TADe WYE I_SCH 40 BELL�II L CONDITIONS � I
•
SCS
PVC
!• Lu l
r:
6•ADS SOLID PIPE AT OUTLET TO CREST OF PIPE ( e'
•
• SPECIFICATIONS OR SCH 80 PVC(SOLID)
O 0 EXISTING • • CLEANOUT#5 -(ten
- WASHED noes MANN •
oo°.. yy.::::::.::.:::::::0 O no 623 I I • 20 Fr(coos) 140 Fr(CONS) L/ \
-1 T'£`'!fi:sa'._ 0 • 24" 200 FT(CONE) 30 FT(CONE)
il• • • DETAIL(TRANSITION FROM PERFORATED ADS TO SCH 8O PVC) I !
0O DRAINAGE • •• ••• CLEANOUT#6 DETAIL(TRANSITION REVERSED FROM SCH BO PVC TO SOLID ADS)
cS O DITCH M3 •.•.• :... .� -
622 5 NOTE.SILT FENCE REMOVED BY EGI,INC.
FOLLOWING SEEDING AND STABILIZATION WITH Wire. u 0
NORTH AMERICAN GREEN EROSION CONTROL MATTING tense
FRENCH DRAIN OUTLET DETAIL Cross Sect ion
ii <a
8'max standard sfr7301.fabric with wire;mei,'
SCALE:NONE 12'NCDOT ft5 STONE ,re mex..xira Alrve•ih fmr:c.ith°ut r1.a aysFilter View
J G 0
3 Steel fabric BockHll trench Natura' 4I- a rc
and Compact f W
sten' it-T �- B -r-dr post / thoroughly ground W i F U
EXCAVATE SLOUGHED MATERIALS TO BENCH INTO FIRMP•t -` � t rDolDslSOILS.PLACE SEPARATION GEOTEXTILE(MIRAFI 600X OR24'NCDOT CLASS A RIPRAP 7 s N c`L T Phsr'�c or FIs ZHAPPROVED EQUAL)ON EXPOSED SOIL.BACKFILL TO DESIGN 4 c >k r ,rare tm .;, M i D
GRADE WITH CLASS BRIP-RAP " a a�""c r/ eZ J Z
2lit
1 W< •�' a
4 2TYp 6271 t 440'1,
t n4ay.,' � .m'n.. D F
Ups
R SCARP REPAIR(40t LONG) t T� _ — _- --B-' '`tI - �emEl 24` •.:.. mfi D i �D
/ 1 W Z
1 MIRAFI BOOX FABRIC a--'1.64.14'"tea S-r: R W m
OVER-EXCAVATE TOE SO MINIMUM RIP-RAP THICKNESS IS 18' - 6261 I a Y
-`s..,,,, QNOTE:ROCK CHECK DAM REMOVED BY EGI,INC. 24' 144.
F;,Ir ° O
�- FOLLOWING SEEDING AND STABILIZATION WITH
-L—'"' fabric
NORTH AMERICAN GREEN EROSION CONTROL MATTING -. U Ate
aft We
'''.."47.-
SCARP
44SCARP REPAIR DETAIL 0 ROCK CHECK DAM DETAIL SILT FENCE DETAIL NOTE: USE MIRAFI 100XSILT FENCE „60-114N,
3
>:Fr 431 (OR APPROVED EQUAL)
MIRAFI 600X FABRIC SCALE NONE SCALE:NONE SCALE:NONE �' M"1410
S REFERENCE.NORTH CAROLINA EROSION AND SEDIMENT CONTROL PLANNING AND DESIGN MANUAL,CHAPTER 6,MARCH 2009 3 5
DUKE REPORT No. ASR-UNITS 1-5-2011-0001-000^ j