NC0004961_RBSS CSA Report_Figures_20150818

JI I C LVI.H I IVIV IVIHI+
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
URIC
AUGUST 2015
FIGURE
2-1

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NTION A

THE,�,NECK
4}
RIVERBEND C
t STEAM STATIQX
,juC►statiori
r
Nm—
'r
RRENT WAST.t
BOUNDARY
(APPROX)
it • •
J � i,`f • • r
D a Power V i llage
•
i JAI � • •r � •
• • • • r
i
NOTES:
I. SOURCE: USGS TOPOGRAPHIC MAP - PAW CREEK,
CREATED 1948.
SCALE (FEET)
500 0 500 1000
F�2
1948 PAW CREEK TOPO
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
a
11
Ir
Ir
-------------
r�
DATE
AUGUST 2015
FIGURE
2-3
GASTON COUNTY, NORTH CAROLINA

FN
PRIMARY ASH
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YARD SUMP PUMP LOAD CENTER \ \ 1 // I� .` ;� .:
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/ \
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YARD DRAINAGE SYST� M
DISCHARGE PIPE h;lil II I! I !I,i ASH BASIN
PFtw� VP`�� `' - e J/ I I I I I I PRIMARY CELL
LPG P \sv
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ASH SLUICE PIPING
\\\ CINDER
�\ DOZER FUELING STATION STORAGE
�\ INTAKE CANAL �. -' \\ \ I / / //,� \�
TRACTOR SHED I I I / _ J/ /
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_ _ _ _
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s. /. SEWAGE TREATMENT SYSTEM OIL STORAGE HOUSEI:'
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USED MINERAL OIL TANK
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COMBUSTION TURBINE -POWER HOUSE
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- -
JET WAREHOUSE y
INSTRUMENT HOUSE
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MAIN FUEL OIL � � / / -/
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1
I I TURBINE HOUSE U10 SULFURIC ACID SYSTEM
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11 TRANSFORMERS
\ 1100 kV SWITCHYARD
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°j` MAINTENANCE SHOP
OUBLE WIDE TRAILER �t<Q'
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■Trsee Elements
NOTES:
1. FIGURE
WAS OBTAINED FROM THE EPRI COMPARISON OF COAL COMBUSTION
PRODUCTS TO OTHER
MATERIALS - CHEMICAL CHARACTERISTICS, FIGURE 3-1, PG 3-2, EPRI, FINAL REPORT, SEPTEMBER 2010.
F)l
ELEMENTAL COMPOSITION FOR BOTTOM ASH,
FLY ASH, SHALE, AND VOLCANIC ASH
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
3-2
GASTON COUNTY, NORTH CAROLINA

1000
_ .1 00
J
10
0 1
0.1
a)
0.01
0.001
b--
0.0001
0.0000,1
As Ba cd cr pb Hg Se Ag
OMininwm
aximum
P�eraemkie Element
TICi_P regalattxy Limit
1 W` Rrrtil�
NOTES:
1. FIGURE WAS OBTAINED FROM THE EPRI COMPARISON OF COAL COMBUSTION PRODUCTS TO OTHER
MATERIALS — CHEMICAL CHARACTERISTICS, FIGURE 9-1, PG 9-1, EPRI, FINAL REPORT, SEPTEMBER 2010.
F)l
COAL ASH TCLP LEACHATE CONCENTRATION
VS REGULATORY LIMITS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
3-3
ASTON COUNTY, NORTH CAROLINA

100000
10000
1000---
E.
loo
Ic
10
c�
0
1
C
�
i].1
0
0.01
0.001
NOTES:
1. EPRI 2009B.
•
}
As Ba Cd Cr Pb Fitt Se Ag Sb Be B Co Cu Mn Ni TI 1V Zn
ERA Residential Soil Screening Level Element
*Concentrations less than
Fly Ash Range (101 and 901 percentile) method detection limits.
TRACE ELEMENTS IN FLY ASH VS SOIL (EPRI)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
3-4
ASTON COUNTY, NORTH CAROLINA

100000
10000 -
f � �
1000 -
E l oo I
� I
0 I
'C
'V 0.1
0.01
0.001
As Ba Cd Cr Pb Hg Se Ag5b Be B Cu Mn N1 TI V Zr
EPA Residential Soil Screening Level Element
`Concentrations less than
Bottom Ash Range (10' and 90' percentile) method detection limits.
NOTES:
1. EPRI 2009B.
TRACE ELEMENTS IN BOTTOM ASH VS SOIL (EPRI)
F MI offifth DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
3-5

"
BR
O
O
KSHIRE BLVD
(SECONDARYCELL)
(PRIMARYCELL)
ASH BASIN
CINDERSTORAGEASHSTORAGE
RIVERBENDSTEAM STATION
H O R S E S H O E
N C 1 6
STEAM PLANT
C
O
P
P
E
R
H
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R
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N

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TURNOUT
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B R O O K R I D G E
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IL
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R
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G
R I V E N D E L L
C E D A R
T H E L O O P
L A U R E L
G L E N
JOHNSON
S U M M E R
W I N D
R O C K Y
B E E C H B L U F F
CRICKET
HOLLOW
COVEPOINTE
L A K E H A V E N
S T O N E W A T E R
B A Y H
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E
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N
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NC 16
W I L
L O W
T R E E
NC 16LUMBER
HORSESHOE BEND BEACH
NECK RD
NEC K R D
JOHNSON-D A V I S
RD
BALLYPATLN
DRAKE COVE RD
J
O
H
N
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O
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1
USGS RECEPTOR MAPDUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
AU GUST 2015
4-1
P A T H : G :\P R O J E C
T S \D U K E _E N E R
G Y \A S
H _B A S I N _W E L L S
_R E C E P T O R S \C L I F F S
I D E \M X D \R B S S _F
I G _4 _1 _2 0 1
5 0 7 2
3 _M C M .M X D - U S E R : M M U R C H I S - D A T E : 7
/2
3 /2 0 1 5
NOTES:1. ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE.2. PRIVATE WELLS LOCATIONS ARE APPROXIMATE.3. USGS 7.5-MINUTE SERIES TOTOGRAPHIC BASEMAP COPYRIGHT:© 2013 NATIONAL GEOGRAPHIC SOCIETY, I-CUBED4. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a).5. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS LAKE NORMAN SOUTH, NC AND MOUNTAIN ISLAND LAKE, NC-VA.6. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE.7. INFORMATION PERTAINING TO IDENTIFIED WATER SUPPLY WELLS IS INCLUDED IN TABLE 4-1
Legend
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARYCOINCIDENT WITH DUKE ENERGYPROPERTY BOUNDARY
0.5 MILE OFFSET FROM ASH BASINCOMPLIANCE BOUNDARY
STREAM
"SURFACE WATER INTAKE
REPORTED PRIVATE WATER SUPPLY WELL
N
500 0 500 1,000SCALE (FEET)
Brookshire Blvd
(SECONDARYCELL)
(PRIMARYCELL)
ASH BASIN
CINDERSTORAGEASHSTORAGE
RIVERBENDSTEAM STATION
H O R S E S H O E D RSTEAM PLANT RD
C
O
P
P
E
R
C
V
H
E
R
O
N
C
O
V
E

D
R
LEE ST
AUBURNCV
MARIN CT
TURNOUTDR
B
R
A
X
T
O
N
G
A
T
E

C
T
LUCIA RIVERBEND HWY
B R O O K R I D G E D R
W
IL
L
O
W
S
P
R
I
N
G
T
R
L
R I V E N D E L L
C T
C E D A R S T
L A U R E L
G L E N C T
JOHNSONST
S U M M E R
W I N D L N
R O C K Y L N
CRICKET
HOLLOW
COVEPOINTE
L A K E H A V E N
D R
S T O N E W A T E R B A Y L N
H
O
R
S
E
S
H
O
E
L
A
K
E

R
DOAKSTFOXRIDGE L N
WOODWARDRIDGE DR
S O U T H
C E N T U R I O N L N
N I V E N S
C O V E R D
WATERFORD DRVIL
L
A
G
E
G
L
E
N
W
A
Y
W O O D W I N D S D R R I V E R S I D E D R
HOLDSWORTH
DR
HIDDENPINES DR
H O L B E R T L N
E
D
D
I
E
N
I
C
H
O
L
S

D
R
W
I
L
L
O
W
T
R
E
E

L
N
N
C 16 H
W
Y
L U M B E R L N
HORSESHOEBENDBEACH RD
1
NECK RD
NEC K R D
JOHNSON-D A V I S
RD
BALLYPATLN
DRAKE COVE RD
J
O
H
N
S
O
N
-
D
A
V
I
S
R
D
D
U K E
A C C E S S R D
N E C K R D
A R T H U R
A U
T
E
N
R
D
RECEPTOR MAPDUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
AU GUST 2015
4-2
P A T H : G :\P R O J E C
T S \D U K E _E N E R
G Y \A S
H _B A S I N _W E L L S
_R E C E P T O R S \R I V E R B E N D \M X D \R B S S _F I G _4 _2 _2 0 1
5 0 7
2 3 _M C M .M X D - U S E R : M M U R C H
I S - D A T E : 7 /2
3 /2 0 1
5
NOTES:1. ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE.2. PRIVATE WELLS LOCATIONS ARE APPROXIMATE.3.ORTHOPHOTOGRAPHY IS FROM NC ONEMAP GIS ONLINE SERVICE.4. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a).5. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS LAKE NORMAN SOUTH, NC AND MOUNTAIN ISLAND LAKE, NC-VA.6. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE.7. PROPERTY BOUNDARIES WERE SUPPLIED BY THE GASTON COUNTY AND MECKLENBURG COUNTY GIS OFFICES.8. INFORMATION PERTAINING TO IDENTIFIED WATER SUPPLY WELLS IS INCLUDED IN TABLE 4-1
Legend
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARYCOINCIDENT WITH DUKE ENERGYPROPERTY BOUNDARY
0.5 MILE OFFSET FROM ASH BASINCOMPLIANCE BOUNDARY
STREAM
PROPERTY LINES
REPORTED PRIVATE WATER SUPPLY WELL
N
500 0 500 1,000SCALE (FEET)
r, 5
NOTES:
1. ASH BASIN, ASH STORAGE AREA, AND CINDER STORAGE AREA WASTE BOUNDARIES ARE APPROXIMATE.
2. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
3. CMP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED METAL PIPE. HDPE IS ASSUMED TO BE AN
ABBREVIATION FOR HIGH DENSITY POLYETHYLENE. CPP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED
PLASTIC PIPE. RCP IS ASSUMED TO BE AN ABBREVIATION FOR REINFORCED CONCRETE PIPE.
4. UNDERGROUND FEATURES PROVIDED BY STANTEC AND DUKE ENERGY.
5. PIPE LOCATION AND LENGTH SHOWN ARE APPROXIMATE.
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{ i `` .. Y
46
1. k-y; -.'S C �*g1 ., l ;-1 r ♦-+. 1.
_ r 1
_ ',� A . �� S' _�'i'i"�f a� s' f a E s 1 _ �,� • ` F �►�tY 5 .r ,•c 1�,Y'.-
vit
��+�'MR ii '1`�iI•• �_1 ,�Y: - � <' � �,'.T.,�yt�f' ti '. � i Jtt' .�cf-
5 w �.° ram' a»• '� ,
' _ .r M _ ""� ti F t y� .►i ter, '4'M,
' vr%i§ a'� - a •, `' , ,'.• ?� 'd ,� r°r �''�" � .a"•l' t � `�'R_" s, 6;�-�` �'- -�- y� .. �= -Z4 rY�.. .'�.i
_ {.,ray • iF:~- r f �. �d ��. x /17, �_ i ik _` 40
r I .,� , J +'` ' • - r I �{ 4^�. , .yi ..yifi .y' r �.; ., ♦ -r `r< !ri i• _ .; l
at
_ _ � b r , � ��'� � �'r i�+� ..�' ht 'i'! s. �. �l �T'��1 f,�-�,�p�j,��� '� d 5'. �, d f _ � r2�*�t F }-4_- .8 r•��,gtC t«
.L Ft _ �s - '�. + . - :' '+la'- .^r-� _ . _ 'ss.. s�`. t•fr'_. :%.•i. M `•_' ':3'. rl'. `--i ; " T:s :"':C'r' ''' 3.rL&t41,'
LEGEND:
N
ASH BASIN WASTE BOUNDARY
1500 FT OFFSET FROM ASH BASIN WASTE BOUNDARY
PIPE SEGMENT
ASH BASIN UNDERGROUND FEATURES MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTO N COUNTY, NORTH CARO D NA
DATE
AUGUST 2015
FIGURE
43

NOTES:
1. ASH BASIN, ASH STORAGE AREA, AND CINDER STORAGE AREA WASTE BOUNDARIES ARE APPROXIMATE.
2. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
3. CMP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED METAL PIPE. HDPE IS ASSUMED TO BE AN
ABBREVIATION FOR HIGH DENSITY POLYETHYLENE. CPP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED
PLASTIC PIPE. RCP IS ASSUMED TO BE AN ABBREVIATION FOR REINFORCED CONCRETE PIPE.
4. UNDERGROUND FEATURES PROVIDED BY STANTEC AND DUKE ENERGY.
5. PIPE LOCATION AND LENGTH SHOWN ARE APPROXIMATE.
i
'>
�rh
111 1r t Fi! ?'y�M*' L i., .�, � �y ° P: �• � *+�\ - !�' �µ � `. � �`�* r r �
���� r � �.� � � �� �.'. � � -• Yam„ 1 � 1. � r''t.. -� - C. r .. ,
VF
14
s
(
,i. < '�' � i. +may :• �vC 'ri ,
.•-�,''!� .. ' l t li Y , ^ r, r ) rrr- r�fi kr
Jr .4.1fw
a" "V '.• r "fit 7 �.. � � �� . :�`` as `w�+! '�,'�, �r�4 I t + j r� � .... Z w.'i. -r
10, 41
4 R J L q 6 a 1
4 ,
SCALE (FEET)
/00' 0 /00' 200'
l" = 200' �
LEGEND:
N
ASH BASIN WASTE BOUNDARY
1500 FT OFFSET FROM ASH BASIN WASTE BOUNDARY
PIPE SEGMENT
ASH STORAGE AND CINDER STORAGE
UNDERGROUND FEATURES MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
GASTON COUNTY, NORTH CAROD NA
44

r
�k
p..
F
i=
(i
h'
NOTES:
1. ASH BASIN, ASH STORAGE AREA, AND CINDER STORAGE AREA WASTE BOUNDARIES ARE APPROXIMATE.
2. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
3. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS MOUNTAIN ISLAND LAKE, NC AND ON -SITE OBSERVATIONS.
':�'. y �•. � tea• � fiv
3 ♦ � }
SURFACE WATER BODIES
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTO N COUNTY, NORTH CARO D NA
LEGEND:
ASH BASIN WASTE BOUNDARY
1500 FT OFFSET FROM ASH BASIN WASTE BOUNDARY
STREAM
DATE
AUGUST 2015
FIGURE
45

12
3
4
NC OneMap, NC Center for Geographic Information and Analysis, NC
PROPERTIES CONTIGUOUS TOTHE ASH BASIN WASTE BOUNDARYRIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
AU GUST 2015
4-6
P A T H : G :\P R O J E C
T S \D U K E _E N E R
G Y \A S
H _B A S I N _W E L L S
_R E C E P T O R S \R I V E R B E N D \M X D \R B S S _F I G _4 _6 _2 0 1
5 0 7
2 3 _V
1 0 _2
_M C M 2 .M X D - U S E R : M M U R C H I S - D A T E : 7
/2
3 /2 0 1 5
NOTES:1. ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE.2. PROPERTY BOUNDARIES WERE SUPPLIED BY THE GASTON COUNTY AND MECKLENBURG COUNTY GIS OFFICES.3.ORTHOPHOTOGRAPHY IS FROM NC ONEMAP GIS ONLINE SERVICE.4. INFORMATION PERTAINING TO IDENTIFIED PROPERTIES IS INCLUDED IN TABLE 4-2
Legend
ASH BASIN WASTE BOUNDARY
PROPERTY BOUNDARY
N
500 0 500 1,000SCALE (FEET)
Tectonic Map Explanation
(NOTE: Subsurface continuation of terranes shown in lighter shade of same color)
Triassic -Jurassic basins
(patterned subs:nrface;
rifting 3f Fangaea)
Igneous Rocks
_190-179
Ma dikes sjVs. & flaws
rRifting of Pangaea)
285-265 Ma granitoidplutons
rModern age dates)
325-285 Ma granitoidplutons
rModerrn age dates)
350-325 Ma granitoidplutons
rModerrf age dates)
380-355 Ma granitoidplutons
rModern age dates)
O410-80
Malplutons
Likely Ordovician plutons
(no rile dates)
©Ordoviciar
plutons
(Modern age dates)
Greenstone and arTtp,'ribolite
(Ne3prvterozoic to Ordovician)
of arc, VORB, and continental
affinities. Only Blue Ridge units
shown, includes Catoctin Frn. (VA) S.
Hillabea Greenstcane (AL -GA).
Uiframafic rocks
(Neaproterozoic to Ordovician)
700-530 Ma are -related granitoids
(Carolina superterrane)
-735 Ma rift -related a;kalic pfutons
(Faded rifting 3f Rodinia)
Laurentian Platform
& Rifted Margin
Clastic Wedges
Allegha.nian (Mississippian -Pe)
Acadian and iVeoacadian
(Late Den -"rly Mississippiarn)
Jermisan Ghent (Al)
(Early to Middle Devonian)
Talladega belt (AL -GA)
O Fossilifereous Erin Slate
(early Mississippian)
Lay Darts Formation
(Middle Ordovician?
to Devonian?)
Lower Cambrian to Lower Ordovician
Laurentian margin clastic and
carbonate rocks
I� Rifted margin succession
equivalents (iVeopro(erozcric-
Early Cambrian)
Wedowee Group(?) (AL)
(Ordovician oryoc,nger)
Tcaconian
Martinsburg -Tuscarora
rCaradoc to Llandoveary)
Blo._jntian-Sevier Roakrvart
Mineral Bluff (Murphy syncline in Bice Ridge)
rL lan virfr L la ndeho)
Necproterozoic to Ordovician(?, rocks
3f tue Nurphysyrnchre (includes Nantahala
and Brasstown Formations)
Platform Rocks
Cambrian -Ordovician
clastic to carbonate
Riftet:d i"vliargin ;cocks
Ne;cproterozoic-Earlyl Cambrian
clastic & volcanic rocks. Includes
Balfimore lerrane.
Quartzite of unknown affinity in windows
in Cartoogachaye terrane, Tugaloo !errane,
and Sawretown Mountains window
Pine Mountain Window Rock--
Wetamorphosed Paleazofc ptatform(?) cover
- 1.0 -1. t GA basement rocks
Basement Rocks (Blue Ridge and wes t?m
Piedmont all Condw;anan affinity based on
Ph isra'npes)
1.0-1.2 Ga with offer inh, ritance.
erharnockile indicated by darker red.
1.8 Ga Wars Hill terrane,
Terranes Accreted
During Taconian Events
(Laurentian affinity. distal, deep -water deposits)
Hamburg cornpiex (iHc)
Allochthons and u istostrornes of deop-Evator, distal margin
clas!ics and carbonafes (Dauphin Formation) thrust into the
fooreland over the Myerstown euxinic platform limestooe, and
covered by the Martinsburg Formation. Includes greenschist
facics eeauivalent clastic Cocalico Fcrrnatiort to the SE.
Westminster terrane
Q
NeoproterotoiclCambrian-Middle Ofdovician deposition &
volcanism. Sedimentary component }» volcanic.
Dah►omega ,gold beit
Neoproterozoic Carobrion-Middle Ordovician clastic
deposition R MORa.rarc volcanism, minor 1.15 Ga j?)
bascmeot. Sediment ity component »A volcanic_ Contains
detrital zircons ofpossibla Gondwanan or Penokean affinity
Cowrock terrane
NeoproleroroiclCambrialn clastic deposftion, ophlc 10A +
vokanism, minor ?.15Gal?) basement. Sedimentary component
>3-:1, volcanic. Middle Ordovician ton.ilite pluton.
Cartoogechaye terrane
iNeoproterozoic/° ambrian(?l clastic deposition, ophiorite (ntafic-
ultramafic complexesa, & MORBlarc volcanism. minor 1. IS Ga
basement. Sedimentary c3mpum?nt>volcanic.
Terranes Accreted Daring
Neoacadian to Alleghanian Events
idistal, deep -water deposits
and arc-to-MORB volcanics)
Cat Square terrane
MixedLaurentian B ►yva�onian affinity,
post-430 Pita deposition, minor,arc-to-14ORB volconics.
Tupaio+o (-Milton-Potomac-PhiladelphiaV terrane
Dis at Laurentian; NeoproterozoicfCambirlan-Viddte rdavician
deposition & volcanism, minor 1.15 Go bas erneni,
arc-to-MORS volcanics; m-Wanges, Abundant Ordovician
pleltons. Sedimentary component>> volcanic.
Smith River allochthon
Neoproterozoic metasedimentary and rneta volcanic
rocks: Ordovician plutons. May have Laurentian and
Peri-G3ndwanar► provenance.
OKings Mountain (KM] terrane
Mixed Laurentian & Avalonian affinity,
Neoproterozoic to Cambrian(?) depositicrr with Laurentian
affinity; arc volcanic rocks of peri-Gondwanan affinity.
Carolina superterrane (peri-Gondwanar.)
Supraffa 5rat rle
trpraerustal flow grades corrrponents
iVeoproterozoie deposition and arc volcanism
to Ordovician (?) deposition_
Charlotte terrane
lnfracrustal (high grade) cotnpcnents
Neo,proterozotc deposr i3n and are volcanism.
Brunswick (Charleston) terrane
U Rocks of largely unknown composition
and provenance (likely peri-Gondwanan)
Wiggfns-Suwannee suture
Alleghanian deformation obscured by failed riftin
and deposition of Triassic -Jurassic sediments otgthe
South Georgia basin, Joins East Coast magnetic
anomaly.
Suwannee terrane (Gondwanan provenance)
(units and configurations after Thomas. 19H)
Ordovician -Devonian scdi'menlaryrocks
Neoproterozoic Cambrian folsic volcanic rocks
Supracrus(at flow grades components
Neoproterozoic deposition and volcanism
to Ordovician deposition.
Middle Proterozoic Rokelides basement and
African(?) crust (central Appalachians;.
.-. rs:...,_
�� : �~ «- .* 1 �a�-� - a er r� Rj��•01
V.
Carte�rsvill u GA � +c. # � YO
� r by 11EC - ! -,� � f,� `���:,, �f^��,�� �✓����
►A TC
• re
rite Gr.
r
V
loop
AePAN, 1k
V.
0 -,.1 A
- �4
1 �
�, �� •C)�. efl- b . •Oi�'� • -'�}�• •�S�' ��,'i � - _ • Nlli�l P 's \yip+
-
tb AIL
• w"-.4 •'-•'' '"'�``•-.O• a Q•-• .O ►�'•. lay •w.�� 1�� _ - ■
- � o � � ' O_ ,�► o �,a as - - - o �' r ti ®� � - At/ • �
O r . w- a. �Y rr r� +Pw s R- • ,. 0- w O.� �V� F - • i
.0N
ZN
x � � r9 `-i. e -r
Alabatn
a9nell . vi���
gr
fro p V
..............
FL ViT1 '-' -q'� '� q V1 -e ofi-, -o ar•1• -_., .!►.�i �1Col(>ltnbta 1 I V L F\ D L 1 V L )
Nr—
NI
arolinr',
�--�
N.
o - ti • e. 'fit 1s • c+�i+ y r7 -.. -. c, 71 Q � � ON
I AV
-. • ;�� � ��- •�� Abbreviations are
S—
JILHI I JIHI IVIV!f -"war
d Symbols
Aa - Alto allochthon (GA) BBw - Brasstown Bald window (GA)
/ d '�' -• Ci �� «-+ -t+ b •- `rJ •, r Av-Avondalemassit PA l �_ • • - ( ) brow -Dog River-Qao iha window (At -GA)
c� �q Crt. tern: - Carloogaehaye terrane (GA-tytC)
/ 1r b - GBMw -Greif Ba15am Mountains window (MC)
6-k ; � �' Cgh - HonDatomega gold belt (PA) GMw Crandfather Mountain window .VC
h'8rr - Hooey 8raoa rrp�and (PA) ( )
`- q + ■ - ry ' * ` - �ry �_ 4- ` -� h'c - Hamburg complex (PA) LCw - Limestone Cove wradow (T!+)
i• .-+ - o ,_w _' b-' + � ounta'o",_ KMKin Min belt
q , -MCw -Mountain City window ITN(
`. �- . . a •- -_ _ MR - Minc Ridge rrassd (PA)
o •• •�- . _•Z 2 ' oe0r' • Td - Toxaway Boma (SC -NC) Nw- Newton wirrdow(NC,
.0- • SCw-Shhootrn Creekwirrdovs (NC -GA)
TFd Tall.rlah Falls dome l'GA) g f 'A)
C, • - 6 WC - west Chaster massif (PA) SMw - Sauratown Mountains window (NC)
�� , �' • -' -- 4 • - L� ' • _ Wm - Wilmington complex .GE -PA) TC+e - Tuckaleecace Cove, Crades Covc.
`se .p Q, ©- "o « Wr- WhiWrereertrant (SC) and Wear Cove windows (THY)
/ IN, 11 0-o`' .o--'^ •a- NaTE. The Warne fault or f. is not used wish E - Ecfaglte locality
s1` .. - O o- frames of faults in hea Valley and Ridge nr Plareau_
ft,i `�.,: •, r ~' rfajo subsuriase boundary
-ft. mft 4140 u R Subsurface boundary data
�- onacrortagn.Lls
f y Dextral strike -slip fauh
,lides�w� C 81S = Chtsap.ake Bay impact structure
U ��— (X-VA)
/ 7i rfrrust fault
Inner Piedmont Structure
nentti Mormal fault
30 o extent ofsa►n al Salt Flow line (7) derived fnm
............... .... iAr"r<gAy wreed„ aenmagnefs data
rraees of anticlinal hirges
o - rAhughpmy Pf&®au WV -PA -NY) �
IV Ca
o 100
I
kilometers 100
I
miles
NOTES:
1. HATCHER, R. D. JR., BREAM, B. R., AND MERSCHAT, A. J., 2007, TECTONIC MAP OF THE SOUTHERN AND CENTRAL APPALACHIANS: A TALE OF THREE OROGENS AND A COMPLETE WILSON CYCLE, IN HATCHER, R. D., JR, CARLSON, M. P.,
MCBRIDE, J. H., AND MARTINEZ CATALAN, J. R., EDS., 4-D FRAMEWORK OF CONTINENTAL CRUST: GEOLOGICAL SOCIETY OF AMERICA MEMOIR 200, P. 595-632.
Flow the darived from
? ` ;speculated thrustfaul. (AL -GA border) mineral Fnea-lon
Speculated sibsurface extent cf the Central Pledmort suture
her eath Carolina supertarram SE of the Abbeville thrust sheet (SC NC)
77--
'
O
76 33" 75°. 340
Af- AIlatoo ia fault (.-PA)
Agr- Augusta fault (GA -SC)
Asr Ascauga fault (GA-sC)
BAP - Box Ankle fault (GA)
BF.`- Bartlerts Fcrryfauh (AL -GA!
Bs.- Bogertown shear zone �Nc-SC)
CFAf- Craale of Forestry in America fault I'NC)
CGMf - Chunky Gal Wountain faun (GA -MC)
GY Greenbrier fault (W TN)
Ghl-SHr- Gold Hill -Silver WE fau.ts (NC -SC)
GRF- Coat.4ocf fault (Ai -GA)
GSF- Great Smoky fault 'NC -TN -:;A)
Hf- Haye_501ei hutt'locally the lavetuLs surure) (GA -NO
HMV - Po►st3n Mountain fault (TN -VA)
1101-iron Mountain fault [TN -VA)
KMsz -flings Mountain shear zone (NC -SC)
LFf- Linville Fats fault (VC)
MU- Miller Cove fact, and equivalents (TiV-GA)
MSF- Mill Spring fault (GA -SC --NC)
NCF- fYutbish Creel fault (NC -VA)
PG-HV- Pleasant G.-ove-Huntrngton
Valley shear zone ^-MLi)
PMf - Paris Mountain fault (segment of Brindle Creek fault) (SC)
Rsa" - Rosemont shear zone (PA)
SFr- S.4opc Fork fault (►YC)
SW- Six A+fle fault (SC --Ale)
SMtf - Sturrpho3se ilountain fault (SC -NC)
Spr- Spotsfrvaaia fault (VA)
SR'- Soque River fault (GA --NC)
SKI - Stone Wail line fault (AL -GA)
YB! - Yellow Breeches thrust(PA)
35
TECTONOSTRATIGRAPHIC MAP OF THE
SOUTHERN AND CENTRAL APPALACHIANS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
51
GASTO N COUNTY, NORTH CARO U NA

Riverbend Steam StationProperty Line
Lake Norman
Mountain Island Lake
C a t a w b a R i v e r
REGIONAL GEOLOGIC MAPDUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION AUGUST 2015
5-2
G :\P r o j e c t s \D u k e _E n e r g y \A s h _B a s i n _G W _A s s e s s m e n t \G e o l o g i c _S i t e _V i c i n
i t y _M a
p s \M X D s \F i g _5 _
2 _R i v e r b e n
d _S i t e _V i c i n i t y _G e o l o g y _M a p _
2 0 1 5
0 7 1 6
.m x d
DATE
FIGURE
5,000 0 5,000 10,000SCALE (FEET)
N
GASTON COUNTY, NORTH CAROLINA
Notes:Source: Geologic Map of the Charlotte 1° x 2° Quadrangle, North Carolina and South Carolina, 1988, R. Goldsmith, D. J. Milton, and J. W. Horton, Jr., USGS.
Metamorphosed quartz diorite and tonalitemqd
SOIL
Regolith
ZONE
unsaturated
zone
_ Water tatYie
REGOLITH
Regolith
RESIDUUM
saturated
zone
TRANSITION
ZONE
WEATHERED
BEDROCK
r%
f�
UNWEATHERED
BEDROCK
r
phi ♦
FRACTURED BEDROCK
♦
SHEET JOINT
ol
r
�
r
�
t�
BEDROCK
'
STRUCTURE
FRACTURE
NOTES:
1. HARNED, D.A. AND DANIEL III, C.C.
1992. THE TRANSITION ZONE BETWEEN BEDROCK REGOLITH: CONDUIT FOR
CONTAMINATION?, P. 336-348, IN
DANIEL, C.C., III, WHITE,
R.K., AND STONE, P.A., EDS.,
GROUNDWATER IN
THE PIEDMONT: PROCEEDINGS OF A CONFERENCE ON GROUND WATER IN THE PIEDMONT OF THE EASTERN
UNITED STATES, OCTOBER 16-18,
1989, CLEMSON UNIVERSITY, 693P.
F)l
INTERCONNECTED TWO MEDIUM PIEDMONT
GROUNDWATER SYSTEM
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
5-3
GASTON COUNTY, NORTH CAROLINA

A LAND
SOIL SURFACE
0
SAPROLITE c,
a
TRANSITION ZONE �%D���O�D�)p�
(f t'CJQG
:� f
BEDROCK
CIO 1
a) Foliated/Layered Bedrock
LAND
SOIL
SAPROLITE
i
i
INDISTINCT '
TRANSITION ZONE
BEDROCK
b) Massive/Plutonic Bedrock
NOTES:
1. HARNED, D.A. AND DANIEL III, C.C. 1992. THE TRANSITION ZONE BETWEEN BEDROCK REGOLITH: CONDUIT FOR
CONTAMINATION?, P. 336-348, IN DANIEL, C.C., III, WHITE, R.K., AND STONE, P.A., EDS., GROUNDWATER IN
THE PIEDMONT: PROCEEDINGS OF A CONFERENCE ON GROUND WATER IN THE PIEDMONT OF THE EASTERN
UNITED STATES, OCTOBER 16-18, 1989, CLEMSON UNIVERSITY, 693P.
F)l
CONCEPTUAL VARIATIONS OF THE TRANSITION
ZONE DUE TO ROCK TYPE STRUCTURE
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
5-4
GASTON COUNTY, NORTH CAROLINA

Slope Aquifer Boundary and TopograpEc Divide
mmmmmmm Discharge Bomdanj
- - - - - - - Compaitment (G) Boundai77
................. Water Table
Fractures
Groundwater Flow Direction
NOTES:
1. LEGRAND, H.E. 2004. A MASTER CONCEPTUAL MODEL FOR HYDROGEOLOGICAL SITE CHARACTERIZATION IN THE
PIEDMONT AND MOUNTAIN REGION OF NORTH CAROLINA, A GUIDANCE MANUAL, NORTH CAROLINA DEPARTMENT
OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY, GROUNDWATER SECTION, 50P.
F�2
PIEDMONT SLOPE -AQUIFER SYSTEM
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
5-5

")
")
")
")
")
")
")
")")
")")
")")")")
")
")
")
")
")
")
")")
")")
")
")
")
")
")
")
")
")
")
")
")
MOUNTAIN ISL AND LAKE
mgb
DOgm
DOgm
DScgb
DScgb
DScgb
mqdmqd
mqd
mqd
mqd
mqd
mqd
mqd
mqd
mqd
mqd
Metadiorite Gneiss
Metadiorite
Metadiorite
Metadiabase
Metadiorite
Metadiorite
Metadiabase Metadiorite
MetadioriteMetadiorite
MetadioriteMetadiorite
Metadiorite
Metadiorite
Metadiorite
Metadiorite Metadiorite Metadiorite
Metadiorite
Metadiorite
Metadiorite
Metadiorite
Metadiorite
Metadiorite
Metadiorite
Metadiorite
MetadioriteMetadiabase
MetadiabaseMetadiorite
Metadiorite
SITE GEOLOGIC MAPDUKE ENERGY CA ROLINA S, LLCRIVERBEND STEAM STATION ASH BASINGASTON C OUN TY, NORTH CAROLINA
DATE
FIGURE
AUGUST 2015
6-1
NOTES:1. ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE..2. ORTHOPHOTOGRAPHY IS FROM NC ONEMAP GIS ONLINE SERVICE.3. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a).4. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS CHESNEE, NC-SC, AND BOILING SPRINGS SOUTH, NC-SC.5. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE.6. BASED ON GEOLOGIC MAP OF THE CHARLOTTE 1' x 2' QUADRANGLE, NORTH CAROLINA AND SOUTH CAROLINA (GOLDSMITH, MILTON, AND THORTON, 1988)7. SERVICE LAYER CREDITS: NC ONEMAP, NC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS, NC 911 BOARD
N
Legend
GEO LO GY
(DS cgb) Gab bro of the Concord Plutonic Suite -Gabbro, norite, gabbronorite, and hornble ndegabbro; major minerals are plagio bclase, bothclinopyroxene and orthopyroxene, andhornblende, olivine or quartz
(DO gm) Metagranite an d M etagranodiorite - Verylight gray to p inkish -gray, m ediu m- to co arse-grained, foliated, metamo rphosed biotite granite,biotite granodiorite, and hornblende-biotitegranite at M ountain Island, N .C.; coarse-grainedphase is characterized by euhed ral, zonedplagioclase crystals and mosaics o f highlysutured quartz grains
(m gb) Me tagabbro - Dark, coarse-grained;abundant am phibole replaces o livine andpyroxene, although relicts o f these m ineralsoccur; ep idote is com mon , biotite and spinel m aybe present; pla gioclase is less ab undant than themafic minerals; quartz is rare or absent
(m qd) Me tam orpho se d Q uartz Diorite andTonalite - G ray, usually m ediu m- to co arse-grained, generally foliated ro ck comp oseddominantly of plagioclase, quartz, biotite,hornblende, and epidote . Bio tite, hornblende, andepidote co mmon ly associated in clots replacingoriginal mafic phenocrysts; clots may be smearedout, thus definin g foliationOUTCROPPINGS
Metadiabase
Metadiorite
TOP-OF-ROCK AT B ORINGS
")Gneiss
")Metadiabase
")Metadiorite
Contacts - Solid where approximate; dotted whereconcealed
DUKE EN ERG Y PRO PERTY BO UND ARY
ASH BAS IN WA STE BOU NDARY
ASH BAS IN CO MPL IAN CE BOU NDA RY
ASH BAS IN CO MPL IAN CE BOU NDA RYCOINCIDENT WITH DU KE ENE RGYPROPERTY BOU NDA RY
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NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.
2. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE. SCALE (FEET)
3. AS -BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY.
4. SHALLOW MONITORING WELLS (S) - WELL SCREEN INSTALLED ACROSS THE SURFICIAL WATER TABLE. 150' 0 /50' 500'
5. SHALLOW LOWER MONITORING WELLS (SL) - BOTTOM OF WELL SCREEN SET AT THE ASH-REGOLITH INTERFACE. l" - 500'
6. INTERMEDIATE MONITORING WELLS (1) - WELL SCREEN INSTALLEDIN REGOLITH BELOW WATER TABLE AND BELOW ASH IN ASH BASIN.
7. DEEP MONITORING WELLS (D) - WELL SCREEN INSTALLED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCK AND THE REGOLITH.
8. BEDROCK UPPER MONITORING WELLS (BRU) - WELL SCREEN INSTALLED IN COMPETENT BEDROCK IN THE FIRST 15 FEET WHERE NO TRANSITION ZONE EXISTS.
9. BEDROCK MONITORING WELL (BR) - WELL SCREEN INSTALLED IN ROCK FRACTURE ZONE WITHIN COMPETENT BEDROCK.
10. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM NC DOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
11. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
12. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107 (a).
13. SEEP SAMPLING LOCATIONS WERE OBTAINED BY HDR USING A TRIMBLE HANDHELD GPS UNIT ON APRIL 29,2014.
14. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS MOUNTAIN ISLAND LAKE, NC.
* INDICATES SEEP SAMPLING LOCATIONS WERE NOT RECORDED WITH GPS UNIT AND ARE APPROXIMATE.
LEGEND:
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH OR CINDER STORAGE AREA BOUNDARY
STREAM
TOPOGRAPHIC CONTOUR (4 FOOT)
EXISTING ASH BASIN VOLUNTARY GROUNDWATER
MONITORING WELL
EXISTING ASH BASIN COMPLIANCE GROUNDWATER
MONITORING WELL
GROUNDWATER MONITORING WELL LOCATION
OBSERVATION WELL LOCATION
SEEP SAMPLE LOCATION
SURFACE WATER SAMPLE LOCATION
MONITORING WELL AND SAMPLE LOCATIONS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROB NA
DATE
AUGUST 2015
FIGURE
6-2

NOTES:
1. BASE MAP FROM MOUNTAIN ISLAND LAKE, N.C. AND LAKE NORMAN SOUTH, N.C. USGS 7.5-MINUTE TOPOGRAPHIC QUADRANGLES
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UTM GRID AND 1996 MAGNE11C NORTH
4711 DECLINATION AT CENTER Or SHEET South, N.C. USGS 7.5-minute topographic quadrangles
TOPOGRAPHIC LINEAMENTS
AND ROSE DIAGRAM
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
GASTON COUNTY, NORTH CAROL NA
6-3

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AERIAL
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AB2SAB2SNRNR
AB6SAB6S686.73'686.73'
AS2SAS2S694.09'694.09'AS3SA AS3SA 710.01'710.01'
GWA23SGWA23S705.89'705.89'
MW3S MW3S 645.06'645.06'
MW6S MW6S 649.73'649.73'
MW7S MW7S NRNR
MW7SRMW7SR709.04'709.04'
MW8I 707.16'MW8I 707.16'
MW8S 709.86'MW8S 709.86'
AB1S AB1S 685.73'685.73'
AB3SAB3S706.26'706.26'
AB4SAB4S705.91'705.91'
AB5S AB5S 707.5'707.5'
AB5SLAB5SL706.87'706.87'
AB7IAB7I713.78'713.78'AB7SAB7S714.42'714.42'
AB8S 656.55'AB8S 656.55'
AS1S AS1S 678.17'678.17'
BG1SBG1S670.96'670.96'
BG2SBG2S651.82'651.82'
BG3SBG3S644.96'644.96'
C1SC1S653.31'653.31'
C2S C2S 656.39'656.39'
GWA10SGWA10S643.79'643.79'GWA1S GWA1S 661.15'661.15'
GWA20S GWA20S NRNR
GWA22S 712.92'GWA22S 712.92'
GWA2SGWA2S645.13'645.13'
GWA3S GWA3S 646.21'646.21'GWA3SAGWA3SA645.52'645.52'
GWA4S GWA4S 674.17'674.17'
GWA5SGWA5S710.41'710.41'
GWA6S GWA6S 715.45'715.45'
GWA7S GWA7S 670.18'670.18'
GWA8S GWA8S 671.26'671.26'
GWA9S GWA9S 648.24'648.24'
MW10MW10643.74'643.74'
MW11SR MW11SR 664.68'664.68'
MW12MW12NRNR
MW13MW13643.07'643.07'
MW14MW14652.62'652.62'
MW15MW15643.74'643.74'
MW1SMW1S652.58'652.58'
MW2S MW2S 687.03'687.03'
MW4SMW4S648.16'648.16'
MW5SMW5S643.55'643.55'
MW9MW9647.74'647.74'
OB1 OB1 707.75'707.75'OB2 OB2 675.98'675.98'
S R -1 9 1 2
POTENTIOMETRIC SURFACE – SHALLOW WELLS (S)(7/8 - 10, 2015)
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
6-5
P A T H : S :\P R O J E C T S \D U K E E N E R G Y \A S H B A S I N \M A P _D O C S \R I V E R B E N D \R E P O R T _R I V E R B E N D _A N S I B _G W _C O N T O U R _S _W E L L _C O N T O U R S .M X
D - U S E R : D S O U C I E - D A T E : 8 /1
7 /2 0 1
5
LEGEND
!<ASH BASIN ASSESSMENT GROUNDWATERMONITORING WELL
!<ASH BASIN COMPLIANCE GROUNDWATERMONITORING WELL
!<ASH BASIN VOLUNTARY GROUNDWATERMONITORING WELL
GROUNDWATER CONTOUR LINE
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENTWITH DUKE ENERGY PROPERTY BOUNDARY
STREAM
AU GUST 2015
N
500 0 500 1,000
SCALE (FEET)
NR - NO READING
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C a t a w b a R i v e r
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FLOW
AB1DAB1D666.2'666.2'
AB2DAB2D678.41'678.41'
AS1DAS1D675.39'675.39'
AB3D 700.2'AB3D 700.2'
AB4DAB4D702.91'702.91'
AB5DAB5D677.13'677.13'
AB7DAB7D713.48'713.48'
AB8DAB8D658.58'658.58'
AS2D AS2D 695.47'695.47'AS3DAS3D712.53'712.53'BG1D BG1D 674.44'674.44'
BG2DBG2D647.96'647.96'
BG3DBG3D644.85'644.85'
C2DC2D653.38'653.38'
GWA20DGWA20DNRNR
GWA22DGWA22D709.29'709.29'GWA23DGWA23D704.94'704.94'
GWA3DGWA3D645.5'645.5'
GWA4DGWA4D673.88'673.88'
GWA5DGWA5DNRNR
GWA6DGWA6D714.74'714.74'
GWA7D GWA7D 670.98'670.98'
GWA8D GWA8D 671.08'671.08'
GWA9DGWA9D653.78'653.78'
MW11DRMW11DR664.59'664.59'
MW15DMW15D643.84'643.84'
MW1DMW1D649.95'649.95'
MW2DMW2D687.39'687.39'
MW3DMW3D652.45'652.45'
MW4DMW4D647.32'647.32'
MW5DMW5D647.66'647.66'
MW6DMW6D650.63'650.63'
MW7DMW7D714.4'714.4'
MW8DMW8D705.55'705.55'
MW9DMW9D647.93'647.93'
6 8 5 '
6 8 5 '
6 6 5 '6 6 5 '6 4 5 '
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685'
665'
665'
6 8 5 '6 8 5 '
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645'
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7 0 5 '
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7 1 5 '7 1 5 '
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6 6 5 '6 4 5 '
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S R -1 9 1 2
POTENTIOMETRIC SURFACE – DEEP WELLS (D)(7/8 - 10, 2015)
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
6-6
P A T H : S :\P R O J E C T S \D U K E E N E R G Y \A S H B A S I N \M A P _D O C S \R I V E R B E N D \R E P O R T _R I V E R B E N D _A N S I B _G W _C O N T O U R _D _W E L L _C O N T O U R S .M X
D - U
S E R : D S O U C I E - D A T E : 8
/1
7 /2 0 1 5
LEGEND
!<ASH BASIN ASSESSMENT GROUNDWATERMONITORING WELL
!<ASH BASIN COMPLIANCE GROUNDWATERMONITORING WELL
!<ASH BASIN VOLUNTARY GROUNDWATERMONITORING WELL
Groundwater Contour Line
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENTWITH DUKE ENERGY PROPERTY BOUNDARY
STREAM
AU GUST 2015
N
500 0 500 1,000
SCALE (FEET)
NR - NO READING
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GWA23BRGWA23BR703.38'703.38'
GWA7BR**GWA7BR**''
AB3BR AB3BR 583.67'583.67'
AB6BRUAB6BRU663.59'663.59'BG2BRBG2BR693.83'693.83'C1BRUC1BRU549.33'549.33'
GWA20BR GWA20BR NRNR
GWA22BRGWA22BRNRNR
GWA2BRGWA2BR645.24'645.24'
GWA4BRGWA4BRNRNR
GWA7BR 671.01'GWA7BR 671.01'
GWA9BRGWA9BR541.34'541.34'
MW15BRMW15BR643.95'643.95'
MW7BRMW7BR711.76'711.76'
MW9BRMW9BR648.72'648.72'
GWA2BRUGWA2BRUNANA
GWA1BRUGWA1BRU662.07'662.07'
GWA10BRUGWA10BRU643.92643.92
7 2 0 '7 2 0 '
7 0 0 '7 0 0 '
6 8 0 '6 8 0 '
6 6 0 '6 6 0 '
S R -1 9 1 2
POTENTIOMETRIC SURFACE – BEDROCK WELLS (BRU AND BR)(7/8 - 10, 2015)
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
6-7
P A T H : S :\P R O J E C T S \D U K E E N E R G Y \A S H B A S I N \M A P _D O C S \R I V E R B E N D \R E P O R T _R I V E R B E N D _A N S I B _G W _C O N T O U R _B R _W E L L _
C O N T O U R S .M X
D - U S E R : D S O U C I E - D A T E : 8 /1
7 /2 0 1
5
LEGEND
!<ASH BASIN ASSESSMENT GROUNDWATERMONITORING WELL
GROUNDWATER CONTOUR LINE
DUKE ENERGY PROPERTY
ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENTWITH DUKE ENERGY PROPERTY BOUNDARY
STREAM
AU GUST 2015
N
500 0 500 1,000
SCALE (FEET)
NR - NO READING
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S-5
S-4
S-3
S-1
S-6
S-7
S-8S-2
S-9
S-10
S-11
S-12
S-13
SW-1
SW-2
ASH BASINPRIMARYCELL
ASH BASINSECONDARYCELL
ASHSTORAGEAREA
CIN DERSTORAGEAREA
SOURCE CHARACTERIZATION SAMPLE LOCATION MAP
GASTON COUNTY, NORTH CAROLINA
P A T H : \\S A C -S R V 0 1 \G I S \P R O J E C T S \D U K E E N E R G Y \A S H B A S I N \M A P _D O C S \R I V E R B E N D \R E P O R T _R I V E R B E N D _A R C H D _S O U R C E C H A R A C T E R I Z A T I O N _S A M P L E L O C A T I O N .M X D - U S E R : S N O R T O N - D A T E : 8 /1 7 /2 0 1 5
LEGEND:
!(SEEP AND SEDIM ENT SAMPLE LOCATION
!(SUR FACE WATER SAM PLE LOCATION
#NCDENR MARC H 20 14 SAMPLE LOCATION
&<POREWATER SAM PLE LOCATIONS
ASH BASIN C OMPLIANC E BOUN DARY
ASH BASIN C OMPLIANC E BOUN DARY C OINC ID ENTWITH DUKE EN ER GY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
DUKE ENERGY PROPERTY BOU NDARY
STREAM
DATE
FIGURE
AUGUST 2015
7-1
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
N
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NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.
2. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
3. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM NC DOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
4. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
5. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L .0107 (a).
6. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS MOUNTAIN ISLAND LAKE, NC.
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DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH OR CINDER STORAGE AREA BOUNDARY
STREAM
TOPOGRAPHIC CONTOUR (4 FOOT)
NCDENR MARCH 2O14 SEEP SAMPLE LOCATIONS
NCDENR MARCH 2O14 SAMPLE LOCATIONS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROD NA
DATE
AUGUST 2015
FIGURE
72

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5 5
8 8
N
C-16 Business
S R -1 9 1 3
S R -1 9 5 7
S R -1 9 1 7
N C -1 6
N
C-16
N
C
-
2
7
3
N
C
-
2
7
3
S R -5 5 1 0
SR-1912
S R -1 9 1 2
N C -1 6
NC-16
S
R
-
1
9
6
9
S
R
-
2
1
6
5
SR-2165
SR-2127
S
R
-
2
1
2
6
S R -2 1 2
6
SOIL ANALYTICAL RESULTS – PLAN VIEW (PSRG EXCEEDANCES)
GASTON COUNTY, NORTH CAROLINA
P A T H : \\S A C -S R V 0 1 \G I S \P
R O J E C T S \D U K E E
N E R G Y \A S H B A S I N \M A P
_D O C S \R I V
E R B E N D \R E P O R T _R I V
E R B E N D _A R C
H D _C H E M B O X _S O I L
S .M X D - U S E
R : R O L D E N - D A T E : 8 /1 7 /2 0 1 5
LEGEND
&<ASH BASIN ASSESSMENT GROUNDWATERMONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENTWITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
DATE
FIGURE
AUGUST 2015
8-1
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
N
Sample Dept h (ft )58.5-60 68.5-70SoilSoil
Cobalt 13.5 17.3Iron18,600 16,000Vanadium33.6 34.9Manganese477575
GWA -5D
A naly t e (mg/kg)
Sample Dept h (ft )13.5-15 23.5-25SoilSoil
Cobal t 34.7 20.1Iron23,200 19,000Vanadium73.8 59.2Manganese813296
GWA -7D
A nalyt e (mg/kg)
Sample Depth (ft )7-8Soil
Cobal t 73.8Iron58,900Vanadium209Manganese1,700
GWA -7S
A naly t e (mg/kg)
Sample Dept h (ft )8.5-10 18.5-20SoilSoil
Cobal t 87 102Nickel*DNE 151Iron54,200 36,400Vanadium80.1 33.5Manganese9591,410
GWA -8D
A naly t e (mg/kg)
Sample Dept h (ft)1-1 3.5-5SoilSoil
Iron *DNE 109,000Arsenic*DNE 3.5 JCobalt38.7 19.8Iron62,500 *DNEVanadium143148Manganese1,560 937
GWA -9D
A nalyt e (mg/kg)
Sample Dept h (ft )43.5-45 53.5-55SoilSoil
Cobalt 7.3 J 14.7Iron12,300 J 21,000Vanadium29.2 58.5Manganese446 J 615
MW-7BR
A naly t e (mg/kg)
Sample Dept h (ft )3.5-5Soil
Cobalt 37.9Iron26,000Vanadium55.4Manganese656
MW-9D
A nalyt e (mg/kg)
Sample Dept h (ft )33.5-35 43.5-45SoilSoil
Cobalt 17.6 15.9Iron27,400 36,700Vanadium91128Manganese9051,270
OB-1
A naly t e (mg/kg)
Sample Dept h (ft )38.5-40 48.5-50SoilSoil
Cobal t 36.1 16.8Iron41,000 24,900Vanadium13080.2Manganese1,950 938
OB-2
A nalyt e (mg/kg)
Sample Dept h (ft )28.5-30 33.5-35SoilSoil
Cobal t 34.8 38.9Iron31,700 55,200Vanadium88.2 133Manganese1,090 2,940
GWA -1D
A naly t e (mg/kg)
Sample Dept h (ft )53.5-55Soil
Cobal t 75Iron41,300Vanadium81.6Manganese1,950
A B-4S
A naly te (mg/kg)
Sample Depth (ft)43.5-45 48.5-50 58.5-61.5AshSoilSoil
Arseni c 20.9 *DNE *DNECobalt*DNE 36.1 63.6Nickel*DNE *DNE 167Iron3,390 42,400 19,000Vanadium9.9 58.1 40.4Manganese*DNE 485 3,320
A B-4D
A nalyt e (mg/kg)
Sample Dept h (ft )3.5-5 28.5-30 48.5-50 58.5-60 63.5-65AshAshAshSoilSoil
Arse ni c 14.2 55.4 40 *DNE *DNEArsenic*DNE *DNE *DNE 3.5 J 3.7 JCobalt3.8 J 8.2 J 8.4 16.2 6 JIron6,130 13,500 19,100 36,600 37,100Vanadium15.3 46.4 39 119 141Manganese*DNE *DNE 98.1 135 108
A B-5D
A nalyt e (mg/kg)Sample Depth (ft)3.5-5 13.5-15SoilSoil
Cobalt 6.6 J 17.4Iron48,800 36,400Vanadium11874.4Manganese335574
MW-15D
A naly t e (mg/kg)
Sample Depth (ft )38.5-40 43.5-45SoilSoil
Cobal t 15 12.6Iron24,100 32,300Vanadium89.4 126Manganese7131,120
GWA -2BRU
A naly te (mg/kg)
Sample Depth (ft)43.5-45 48.5-50SoilSoil
Cobal t 25.4 10.5Iron19,000 18,200Vanadium55.8 55.5Manganese1,270 523
GWA -6D
A nalyt e (mg/kg)
Sample Depth (ft)8-9 13-14SoilSoil
Cobalt 24.4 20.7Iron30,100 25,400Vanadium59.3 69Manganese1,840 893
GWA -10S
A naly t e (mg/kg)
Sample Dept h (ft)3.5-5 38.5-40 48.5-50 68.5-70SoilAshSoilSoil
Arseni c *DNE 35.6 33.8 26.5Cobalt*DNE 4.5 J 4.1 J 4.1 JIron7,620 J 9,710 7,220 17,900Vanadium18.1 39.7 23.9 47.9
A B-3D
A nalyt e (mg/kg)
Sample Dept h (ft )13-15 20-25SoilSoil
Cobal t *DNE 70.1Cobalt48.4 *DNEIron57,500 50,200Boron51.7 50Vanadium140145Manganese1,080 1,660
A B-8S
A naly t e (mg/kg)
Sample Depth (ft )3-5 18.5-20 23-24 27-28 34-35.5 73-75SoilSoilSoilSoilSoilSoil
Cobalt *DNE 14.6 11 12.1 8 *DNEIron34,100 23,800 18,100 23,500 19,400 13,500Vanadium67.5 62.3 45.4 50.6 41.6 30.5Manganese114943626724542805
BG-3D
A naly te (mg/kg)
Sample Dept h (ft )3.5-5 48-49 53-54 60-62 74-75SoilSoilSoilSoilSoil
Arsenic 5.5 J *DNE *DNE *DNE *DNECobalt*DNE 14.6 8.5 13.8 9.2Iron36,500 17,100 16,000 20,600 14,600Vanadium89.2 43.9 40.8 58.8 37.9Manganese*DNE 290 689 1,440 975
BG-2D
A nalyt e (mg/kg)
Sample Dept h (ft )18.5-19Soil
Iron 5,320Vanadium11.5Manganese155
GWA -3D
A nalyt e (mg/kg)
Sample Depth (ft )38.5-40 48.5-50SoilSoil
Cobal t *DNE 3.9 JIron7,160 6,990Vanadium7 J 9.3Manganese77.7 113
GWA -22D
A nalyt e (mg/kg)
Sample Dept h (ft )3.5-5 8.5-10 13.5-15 23.5-25AshAshSoilSoil
Arse ni c 34.9 47.8 *DNE *DNECobalt*DNE *DNE *DNE 6Iron18,100 20,400 6,380 11,500Selenium2.7 J 3 J *DNE *DNEVanadium10.6 13.3 15.2 23.3Manganese*DNE *DNE *DNE 242
C-1BRU
A naly t e (mg/kg)
Sample Dept h (ft )3.5-5 8.5-10 18.5-20 23.5-25AshAshSoilSoil
Arse ni c 27.6 10.3 *DNE *DNECobalt4.2 3.7 3.1 J 14Iron19,600 14,300 39,000 12,800Selenium3.4 *DNE *DNE *DNEVanadium15.9 21.1 38.1 40.1Manganese10379.1 *DNE 237
C-2D
A nalyt e (mg/kg)
Sample Dept h (ft )3.5-5 33.5-35 73.5-75 83.5-85.5 88.5-90.5AshAshAshSoilSoil
Arseni c 69.2 31.9 33 *DNE *DNECobalt11.4 8.4 7.5 5.1 5.2Iron9,290 5,240 9,690 14,400 7,540Selenium2.5 J 2.9 J 2.5 J *DNE *DNEVanadium67.7 44.4 37.9 35.4 17.2Manganese*DNE *DNE 74.2 170 194
A S-1D
A naly t e (mg/kg)
Sample Depth (ft )33.5-35 38.5-40SoilSoil
Cobal t 6.9 18.6Iron5,230 7,710Vanadium9.9 14.2Manganese336210
GWA -23D
A naly te (mg/kg)
Sample Dept h (ft )3.5-5 33.5-35 43.5-45 53.5-55 58.5-60AshAshAshSoilSoil
Arsenic 101 61.2 67.2 8.6 *DNEAntimony2.2 J *DNE *DNE *DNE *DNECobalt13.3 9 9.9 5.2 8.3Iron8,340 6,820 8,360 16,600 11,100Selenium2.9 J 3.2 J 3.1 J *DNE *DNEVanadium95.7 52.1 56.5 46 21Manganese*DNE *DNE *DNE 127 793
A S-3D
A nalyt e (mg/kg)Sample Depth (ft )3-4.5 18.5-20 23.5-25 28.5-30 30-31.5AshAshSoilSoilSoil
Arse ni c 40.6 62.7 *DNE *DNE 10.9Cobalt9.6 11.2 5.9 6.1 3.7Iron6,010 6,270 J+12,200 12,900 14,300Selenium2.9 J 3 J *DNE *DNE *DNEVanadium54.1 84.2 33.8 37.3 44.4Manganese*DNE *DNE 313 276 85
A S-2D
A nalyt e (mg/kg)
Sample Dept h (ft )15-19 24-26 32-35 34-36SoilSoilSoilSoil
Cobal t 25.5 5.8 J 4.4 J 3.1 JIron38,700 10,200 8,190 4,950Selenium5.6 J *DNE *DNE *DNEVanadium62.9 19.2 17.3 *DNEManganese367269168231
GWA -4S
A nalyt e (mg/kg)
Sample Dept h (ft )5-6 14-15 24-25 30-31 34-35 44-45SoilSoilSoilSoilSoilSoil
Cobal t *DNE 5 J 22.8 12.1 13.9 9.9Iron32,200 26,800 28,200 20,000 19,300 13,500Selenium*DNE *DNE *DNE 4.7 J *DNE *DNEVanadium89.2 70.2 75.8 59.7 53.3 38Manganese*DNE 226 1,140 518 921 817
BG-1D
A nalyt e (mg/kg)
Sample Dept h (ft )3.5-5 8.5-10 23.5-25 28.5-30AshAshSoilSoil
Arse nic 26.7 68.3 *DNE 24.6Antimony*DNE 2 J-*DNE *DNECobalt8.3 11.8 J+*DNE 4.7Iron6,790 8,240 7,830 21,200Vanadium40.9 77.8 58.2 56.3Manganese*DNE 88.5 *DNE 119
A B-7D
A naly t e (mg/kg)
Sample Depth (ft )18.5-20Soil
Arseni c 35.1Cobalt8.3Iron16,400Selenium2.4 JVanadium66.9Manganese158
A B-7S
A naly t e (mg/kg)
Sample Dept h (ft )40-41.5 45-46.5SoilSoil
Cobal t *DNE 5 JIron9,880 16,300Vanadium1931.1Manganese131184
GWA -20D
A naly t e (mg/kg)
SCALE (FEET)
2,000 0 2,000 4,000
NOTES:U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMITJ = ESTIMATED CONCENTRATION<3.0 = LESS THAN THE LABORATORY REPORTING LIMITJ+ = ESTIMATED CONCENTRATION BIASED HIGHJ- = ESTIMATED CONCENTRATION BIASED LOW
mg/L: MILLIGRAMS PER LITERµg/L: MICROGRAMS PER LITERBOLD: EXCEEDS INDUSTRIAL HEALTH STANDARDUNDERLINED & ITALICS: EXCEEDS PROTECTION OF GROUNDWATERBOLD, UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL HEALTH STANDARD & PROTECTION OF GROUNDWATER
A nalyt e CA S No.NC PSRG Ind1 NC PSRG Prot GW1
Aluminum 7429-90-5 100,000 NSAntimony7440-36-0 94 0.9Arsenic7440-38-2 3 5.8Barium7440-39-3 44,000 580Beryllium7440-41-7 460 63Boron7440-42-8 46,000 45Cadmium7440-43-9 200 3Chromium*16065-83-1 100,000 360,000Cobalt7440-48-4 70 0.9Copper7440-50-8 9400 700Cr(VI)18540-29-9 6.3 3.8Iron7439-89-6 100,000 150Lead7439-92-1 800 270Manganese7439-96-5 5,200 65Mercury7439-97-6 8 1Molybdenum7439-98-7 1,200 NSNickel7440-02-0 4,400 130Nitrate14797-55-8 100,000 NSSelenium7782-49-2 1,200 2.1Silver7440-22-4 1,200 3.4Strontium7440-24-6 100,000 NSThallium7440-28-0 2.4 0.28Tin7440-31-5 100,000 10,000Vanadium7440-62-2 1,200 6Zinc7440-66-6 70,000 1,200* Chromium standard shown is f or C hromium III f or comparison.No av ailable standard f or Total C hromium. A ll units shown in mg/kg.1 - North Carolina DENR Inactiv e Hazardous Sites Branch - Preliminary Soil Remediation Goals (PSRG) Table (March 2015). Industrial Health Based Soil PSRG and Protection of Groundwater PSRG shown f or comparison.
1 12 I 3 4 5 I 6 I 7 8
AS -ID
AS-2D
AS-31D
Sample De th ft
3.5-5
33.5-35
73.5-75
83.5-85.5
88.5-90.5
Sample Depth ft
3-4.5
1 18.5-20
23.5-25
28.5-30
30-31.5
Sample Depth ft
3.5-5
33.5-35
43.5-45 1
53.5-55
58.5-60
Ash
Ash
,ash
Soil
Soil
Ash
Ash
Sail
Soil
Sail
Ash
Ash
Ash
Sail
Soil
Ana' e / k
Ana Ilyte / k
Ana /k
Arsenic
69.2
31.9
33
"DNE
*DNE
Arsenic
40.6
62.7
'DNE
'°DNE
10.9
Arsenic
101
61.2
67.2
866
*DNE
Cobalt
11.4
84
7.5
51
5.2
Cobalt
9.6
11.2
5.9
6.1
3.7
Antimony
2.2]
*DNE
*DNE
*DNE
*DNE
Cobalt
13.3
9
9.9
52
83
Iron
9290
5240
14400
7540
Iron
6010
9270]+
12200
12900
14300
_9690
Iran
8340
6820
8350
16600
11100
Selenium
2.5]
29]
2.5.1
DNE
DNE
Selenium
2.91
33
DNE
*DNE
*DNE
Selenium
2.9]
3.2]
3.1 ]
DNE
DNE
Vanadium
67.7
44.4
37.9
35.4
17.2
Vanadium
54.1
84.2
33.8
37.3
44.4
Vanadium
95.7
52.1
56.5
46
21
A manganese
"DNE
'DNE
Z4.2
170
194
Man aneseI
*DNE
"DNE
313
276
85
ian anese
*DNE
I *DNE
I *DNE 1
127
1 793
SOUTHWEST
NORTHEAST
800 r
800
=i
III _. f
WTmmill--
-----------------------------
700
WA_ 4B
z
0
a
w
w
G WA-4D
Sample
a th ft
118-119.5
PWR
Anal a I
/k
mg/ �
Iql
ran
3,970
Manganese
21Z
500 ' '
0
GWA-46R
Sample Depth (ftj
121.5-122.1
Rock
Anal to (mg/ k
Iron 1280
200
400
GWA-4S
Sample Depth fit
15-19
24-26
32-35
34-36
Soil
Soil
Soil
Soil
Ana /k
Cobalt
25.5
5.87
4.4 J
3.13
Iron
.36700
10200
8190
4950
Selenium
5.61
'DCJE
'DNE
'DNE
Vanadlum
62.9
19.2
17.3
*DNE
Manganese,
367
269
168
2.31
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
800 1000 1200
DISTANCE (ft)
SECTION A
SCALE: HORIZ 1 "=100' FIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
1400
1600
NOT FOR
CONSTRUCTION
m
2000
I141111
N
N
I
00
Ld
ry
D
0
L1
Ld
Z
J
2
U
Q
60
--J 500
2200
DUKE ENERGY CAROLINASILIC
DUKE
ENERGY..
GASTON COUNTN
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
ANALYTE
NC PSRG Ind'
NC PSRG Prot GW'
ALUMINUM
100,00
NS
ANTIMONY
94
0.9
ARSENIC
3
5.8
BARIUM
44.000
580
BERYLLIUM
460
63
BORON
46,000
45
CADMIUM
200
3
CHROMIUM*
100 000
360,000
COBALT
70
0.9
I COPPER
9.400
700
Cr(VI)
6.3
3.8
IRON
100,000 !
150
PLEAD
800
270
I MANGANESE
5,200
65
I MERCURY
8
1
MOLYBDENUM
1,200
NS
NICKEL
4,400
130
NITRATE
100,000
NS
SELENIUM
1,200
2.1
SILVER
1.200
3.4
STRONTIUM
100.OQ
NS
THALLIUM
2.4
0.28
TIN
100.000
10.000
VANADIUM
_
1,200
6
ZINC***
70,000
1,200
*Chromium standard shown is for Chromium III for
comparison.
No available standard for Total Chromium.
All units shown in mg/kg.
1- North Caroilina DENR Inactive Hazardous Sites
Branch - Preliminary Soil Remediation Goals
(PSRG) Table (March 2015). Industrial Health
Based Soil PSRG and Protection of Groundwater
PSRG shown for comparison.
NOTES:
U = NOT DETECTED ABOVE LABORATORY REPORTING
LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
PSRG: PRELIMINARY SOIL REMEDIATION GOAL
FT: FEET
MG/KG: MILLIGRAMS PER LITER
juG/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD
UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL
HEALTH STANDARD & PROTECTION OF
GROUNDWATER
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC < 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION A -A'
SOLID MATRIX ANALYTICAL RESULTS
D
C
B
IA
0 1" 2"
FILENAME FIGURE 8-2.1.DWG SHEET
SCALE AS NOTED FIGURE 8-2.1

0
5
1.1
7
.09
ON
700
N
00
LLJ
L.
z
0
Q LLI
> z
Ld w
J
2
U
Q
600
2400
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
2600
2800
ISSUE DATE DESCRIPTION
3000
3200 3400
DISTANCE (ft)
3600
SECTION A
SCALE: HORIZ 1 "=100' IFIC 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
3800
NOT FOR
CONSTRUCTION
4000
A'
NORTHEAST
1 800
GWA-9D
sample Depth ft
1-1
50.5-51
_43.5-5
Soil
Soil
PWR
Ana e f k
Iron
*ONE
i
*DNE
Arsenic
° DNE
3.53
*DNE
Cobalt
36.7
19.8
14.5
Iron
62500
*DNE
20700
4200
BE
IA-9BR
GWA-9S
700
.o
J 500
4400
DUKE ENERGY CAROLINAS.LLC
/� DUKE
ENERGY.:
GASTON COUNTN
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
ANALYTE
NC PSRG Ind'
NC PSRG Prot GW'
ALUMINUM
100,00
NS
ANTIMONY
94
0.9
ARSENIC
3
5.8
BARIUM
44.000
580
BERYLLIUM
460
63
BORON
46,000
45
CADMIUM
200
3
CHROMIUM*
100,000
360,000
COBALT
70
0.9
I COPPER
9.400
700
Cr(VI)
6.3
3.8
IRON
100,000 !
150
PLEAD
800
270
I MANGANESE
5,200
65
I MERCURY
8
1
MOLYBDENUM
1,200
NS
NICKEL
4,400
130
NITRATE
100,000
NS
SELENIUM
1,200
2.1
SILVER
1,200
3.4
STRONTIUM
100.OQ
NS
THALLIUM
2.4
0.28
TIN
100.000
10.000
VANADIUM
_
1,200
6
ZINC***
70,000
1,200
*Chromium standard shown is for Chromium III for
comparison.
No available standard for Total Chromium.
All units shown in mg/kg.
1- North Caroilina DENR Inactive Hazardous Sites
Branch - Preliminary Soil Remediation Goals
(PSRG) Table (March 2015). Industrial Health
Based Soil PSRG and Protection of Groundwater
PSRG shown for comparison.
NOTES:
U = NOT DETECTED ABOVE LABORATORY REPORTING
LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
PSRG: PRELIMINARY SOIL REMEDIATION GOAL
FT: FEET
MG/KG: MILLIGRAMS PER LITER
pG/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD
UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL
HEALTH STANDARD & PROTECTION OF
GROUNDWATER
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH — ASH
F — FILL
S — ALLUVIUM
M1 — SOIL/SAPROLITE; N < 50
M2 — SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC < 50%
TZ — PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR — SOUND ROCK;REC >: 85% AND RQD >— 50%
CROSS SECTION A -A'
SOLID MATRIX ANALYTICAL RESULTS
IC
Im
0 1" 2"
FILENAME FIGURE 8-2.2.DWG SHEET
SCALE AS NOTED FIGURE 8-2.2
LV
/W

1
2
3
0
5
A
7
91
B
WEST
800
N
7001
650 '
.19
5501
500 '-
0
C-1D
Sample Depth ft
3.5-5
1 8.5-10
1 13.5-15
1 23.5-25
Ash
Ash
Soil
Soil
Ana to _ { k
Arsenic
34.9
47..8
*DNE
*DNE
Cobalt
*DNE
*DNE
*DNE
6
Iron
18100
20400
6380
11500
Selenium
271
33
*DNE
*DNE
Vanadium
10.6
133
15.2
233
Manganese
*DNE
*DNE
*DNE
242
�\ I
C-2D
Sample Depth ft
3.5-5
8.5-10
118.5-20
23.5-25
Ash
Ash
Sail
Soil
Ana Ilyte / k
Arsenic
27.6
10.3
*DNE
*DNE
Cobalt
4.2
33=7
3.1 J
14
Iron
19600
14300
39000
12800
Selenium
34
*DNE
"DNE
*DNE
Vanadium
15.9
1 21.1
381
40.1
Manganese
103
1 79.1
*DNE
237
We .�
111 IIml
AB-8D
Sample Depth ft
90-00.5
PWR
Ana Ilyte / k
Cobalt
3]
Iron
5590
Vanadium
11.4
Manganese
130
200 400 600 800 1000 1200 1400
DISTANCE (ft)
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
SECTION B
SCALE: HORIZ 1 "=100' IFIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
1600
AB -SS
�Sam le De th ft 13-15 20-25
Soil Soil
Ana to / k
Cobalt *DNE 70.4
Cobalt 48.4 '`DNE
Iro n 57500 50200
Boron 51.7 50
Vanadium 140 145
Manganesel 10,60 1660
PRIMARY E
I
m
2000
2200
AB-5D
AB-5SL AB-5S
2400
I AB- 5D
ISam le lie th ft
3.5-5
1 28.5-30
1 48.5-50 7T
58.5-60
63.5-65
Ash
Ash
Ash
Soil
Soil
Ana to /k
Arsenic
14.2
55.4
40
*DNE
"DNE
Arsenic
*DNE
"DNE
*DNE
3.51
3.71
Cobalt
3.61
8.2J
8.4
16.2
6J
Iron
6130
13500
1.4100
36600
37100
Vanadium
15.3
46.4
39
119
141
Man anew
*DNE
*DNE
I 98,1
1 135
1108
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINAS.LLC
/� DUKE
ENERGY.:
GASTON COUNTN
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
EAST
1800
1700
1650
C
� C
IN
C4 *Chromium standard shown is for Chromium III for
comparison.
00 No available standard for Total Chromium.
Lv All units shown in mg/kg.
W
1- North Caroilina DENR Inactive Hazardous Sites
U Branch - Preliminary Soil Remediation Goals
L- (PSRG) Table (March 2015). Industrial Health
Based Soil PSRG and Protection of Groundwater
600 PSRG shown for comparison.
Z NOTES:
J U = NOT DETECTED ABOVE LABORATORY REPORTING
LIMIT
2Z J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN LABORATORY REPORTING LIMIT
Q J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
PSRG: PRELIMINARY SOIL REMEDIATION GOAL
1550 FT: FEET
MG/KG: MILLIGRAMS PER LITER
pG/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD B
UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL
HEALTH STANDARD & PROTECTION OF
GROUNDWATER
-J500
2600
ANALYTE
NC PSRG Ind'
NC PSRG Prot GW'
ALUMINUM
100,00
NS
ANTIMONY
94
0.9
ARSENIC
3
5.8
BARIUM
44.000
580
BERYLLIUM
460
63
BORON
46,000
45
CADMIUM
200
3
CHROMIUM*
100.000
360,000
COBALT
70
0.9
I COPPER
9.400
700
Cr(VI)
6.3
3.8
IRON
100,000
150
PLEAD
800
270
I MANGANESE
5,200
65
I MERCURY
8
1
MOLYBDENUM
1,200
NS
NICKEL
4,400
130
NITRATE
100,000
NS
SELENIUM
1,200
2.1
SILVER
1,200
3.4
STRONTIUM
100.OQ
NS
THALLIUM
2.4
0.28
TIN
100.000
10.000
VANADIUM
1,200
6
ZINC***
70,000
1,200
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC < 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION B-B'
SOLID MATRIX ANALYTICAL RESULTS
0 1" 2"
FILENAME FIGURE 8-3.1.DWG SHEET
SCALE AS NOTED FIGURE 8-3.1
/0

1
2
3
0
5
7
.09
AB-4D
Sample Depth ft
3.5-5
43.5-45
48.5-50
58.5-61.5
Fill
Ash
Soil
Soil
Ana a Jk
Arsenic
*DNE
209
*DNE
*DNE
Cobalt
*DNE
*DNE
36.1
63.6
Nickel
*DNE
*DNE
*DNE
167
Iron
17600
3390
42400
19000
Vanadium
36.4
9.9
581
40.4
Man anew
*DNE
*DNE
485
3.320
700
650
o6
z Lt.l
o Of
Q �
w �
J LL-
w
1111111Y9I61
W
Z
J
2
U
Q
550
500
2600
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
3000
ISSUE DATE DESCRIPTION
3200
ABAS
Sample Depth ft
5 3,.5-55
Soil
Ana e (mg/kg)
Cobalt
75
Ira n
41300
'vanadium
81.6
Manganese
1950
3400
3600
3800
DISTANCE (ft)
SECTION B
SCALE: HORIZ 1 "=40' IFIG 11-1
VERT 1"=10'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
4000
NOT FOR
CONSTRUCTION
4200
4400
4600
DUKE ENERGY CAROLINAS,LLC
/� DUKE
AENERGY.:
GASTON COUNTN
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
M•
700
650
550
500
ANALYTE
NC PSRG Ind'
NC PSRG Prot GW'
ALUMINUM
100,00
NS
ANTIMONY
94
0.9
ARSENIC
3
5.8
BARIUM
44.000
580
BERYLLIUM
460
63
BORON
46,000
45
CADMIUM
200
3
CHROMIUM*
100,000
360,000
COBALT
70
0.9
I COPPER
9.400
700
Cr(VI)
6.3
3.8
IRON
100,000
150
PLEAD
800
270
I MANGANESE
5,200
65
I MERCURY
8
1
MOLYBDENUM
1,200
NS
NICKEL
4,400
130
NITRATE
100,000
NS
SELENIUM
1,200
2.1
SILVER
1,200
3.4
STRONTIUM
100.OQ
NS
THALLIUM
2.4
0.28
TIN
100.000
10.000
VANADIUM
1,200
6
ZINC***
70,000
1,200
*Chromium standard shown is for Chromium III for
comparison.
No available standard for Total Chromium.
All units shown in mg/kg.
1— North Caroilina DENR Inactive Hazardous Sites
Branch — Preliminary Soil Remediation Goals
(PSRG) Table (March 2015). Industrial Health
Based Soil PSRG and Protection of Groundwater
PSRG shown for comparison.
NOTES:
U = NOT DETECTED ABOVE LABORATORY REPORTING
LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J— = ESTIMATED CONCENTRATION BIASED LOW
PSRG: PRELIMINARY SOIL REMEDIATION GOAL
FT: FEET
MG/KG: MILLIGRAMS PER LITER
pG/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD
UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL
HEALTH STANDARD & PROTECTION OF
GROUNDWATER
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH — ASH
F — FILL
S — ALLUVIUM
M1 — SOIL/SAPROLITE; N < 50
M2 — SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC < 50%
TZ — PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR — SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION B-B'
SOLID MATRIX ANALYTICAL RESULTS
IC
IC
0 1" 2"
FILENAME FIGURE 8-3.2.DWG SHEET
SCALE AS NOTED FIGURE 8-3.2
LV
/Fj

1
2
3
0
5
7
z
0
a
w
J
w
C
NORTHWEST
750 r--
700
650
•90
550
500
CATAWBA RIB
MOUNTAIN ISLAN
M
0 200
400
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
AB-4D
Sample Depth (ft)
43.5-45
48.5-50
58.5-61.5
Ash
Soil
Soil
Analyte (mg/kg)
Arsenic
20.9
*DNE
*DNE
Cobalt
*DNE
36.1
63.6
Nickel
*DNE
*DNE
167
Iron
3390
42400
19000
Vanadium
9.9
58.1
40.4
Manganese
*DNE
485
3320
AB-4S
Sample Depth (ft)
53.5-55
Soil
Analyte (mg/kg)
Cobalt
75
Iron
41300
Vanadium
81.6
Manganese
1950
AB-3D
Sample Depth ft
3.5-5
38.5-40
46.5-50
68.5-70
Soil
Ash
Soil
Sail
Aria a /k
Arsenic
"DNE
35.6
33.8
26.5
Cobalt
"DNE
4.5J
4.1 J
4.1 J
Iron
7620 J
9710
7220
17900
Vanadium
18.1
39.7
23.9
47.9
INTERMEDIATE DAM
N I AB-4D AB-4S
mom
— — — -----------------
MW-1 1 DR
MW-1 1 SR
600 800 1000 1200 1400 1600 1800
DISTANCE (ft)
ISSUE DATE DESCRIPTION
SECTION
SCALE: HORIZ 1 "=120' IFIG 11-1
VERT 1 "=30'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
2000
NOT FOR
CONSTRUCTION
EIRM WI;
AB-3D I li II IAB-3S
2200
2400
GWA-7S
Sample Depth (ft j
7-8
Soil
Analyte (mg/kg)
Cobalt
73.8
Iron
58900
Vanadium
209
Manganese
1700
GWA-7D
Sample Depth (ft}' 13.5-15 23.5-25
Sail Soil
Analyte (mg/kg)
�uu
2600
erw
DUKE ENERGY CAROLINAS,LLC
/� DUKE
AENERGY.:
GASTON COUNTN
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
Iran
Vanadium
3000
----__ CWA-7D
3200
LEGEND:
C'
SOUTHEAST
-------1 750
GWA-7B
GWA-7S
3400
700
650
550
500
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >- 50% OR REC < 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION C-C'
SOLID MATRIX ANALYTICAL RESULTS
0 ill2"
FILENAME FIGURE 8-4.1.DWG SHEET
SCALE AS NOTED FIGURE 8-4
C
C
LV
IIIIFj

1
Sample Depth (ft)3.5-5
D Ash
WEST Anal e (mg/kg)
00
Arsenic
Arsenic
Cobalt
Iran
Vanadium
Manganese
14.2
*DNE
3.8 J
6130
15.3
*DNE
CAT)
MOL
IN
•!
0
200
2
AB-5D
28.5-30
48.5-50
Ash
Ash
55.4
40
*DNE
*DNE
8.2 J
8.4
13500
19100
46.4
39
*DNE
98.1
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
MW-1 D
Mw-1 S
58.5-60
Soil
*DNE
3.5 J
I
PRIMARY DAM
3
14
Sample Depth (ft}
3.5-5
Ash
Analyte (mg/kg)
63.5-65
Arsenic
26.7
Soil
Antimony
*DNE
Cobalt
6.3
*DNE
Iron
6790
3.71
Vanadium
40.9
A r
Manganese
*DNE
AB-613RU AB-6S
AE3-5D
Afi6A�SL AB-5SL
z
400 600 800 1000
ISSUE DATE DESCRIPTION
23.5-25
Soil
*DNE
*DNE
*DNE
7830
58.2
*DNE
5
28.5-30
Soil
24.6
*DNE
9
1200 1400 1600
DISTANCE (ft)
SECTION
D
SCALE: HORIZ 1 "=100' FIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NOT FOR
CONSTRUCTION
Sample Dep
Analyte (mg
Sal
c
Van
Manc
:rr
6 1 7 1 8
2000
2200
DUKE ENERGY CAROLINAS.LLC
DUKE
ENERGY.:
GASTON COUNTN
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
f
800
D
N-7BR
VAW-7D
700
600 1
' 500
2400 2600 2800
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH — ASH
F — FILL
S — ALLUVIUM
M1 — SOIL/SAPROLITE; N < 50
M2 — SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC < 50%
TZ — PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR — SOUND ROCK;REC >: 85% AND RQD >— 50%
CROSS SECTION D-D'
SOLID MATRIX ANALYTICAL RESULTS
0 1" 2"
FILENAME FIGURE 8-5.DWG SHEET
SCALE AS NOTED FIGURE 8-5
LV
/0

1
2
3
0
5
A
7
91
F
800
700
650
4-
z
0
w MW—�
500
400
0 200 400 600 800 1000 1200 1400 1600 vv
DISTANCE (ft)
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
SECTION E
SCALE: HORIZ 1 "=80' IFIG 11-1
VERT 1 "=40'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINAS,LLC
/� DUKE
ENERGY.:
GASTON COUNTN
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
ANALYTE
NC PSRG Ind'
NC PSRG Prot GW'
ALUMINUM
100,00
NS
ANTIMONY
94
0.9 I
ARSENIC
3
5.8
BARIUM _
44,000
580
BERYLLIUM
460
63
_
BORON
46,000
45
CADMIUM
200
3
_
CHROMIUM*
100,000
360,000
COBALT
70
0.9
I COPPER
9.400
700
Cr(VI)
6.3
3.8
IRON
100,000
150
PLEAD
800
270
I MANGANESE
5,200
65
I MERCURY
8
1
_
MOLYBDENUM_
1,200
NS
NICKEL
4,400
130
NITRATE
100,000
NS
SELENIUM
1,200
2.1
SILVER
1,200
3.4
STRONTIUM--1
00.0Qa
NS
THALLIUM
2.4
0.28
TIN
100,000
10.000
VANADIUM
1,200
6
ZINC***
70,000
1,200
C
C
*Chromium standard shown is for Chromium III for
comparison.
No available standard for Total Chromium.
All units shown in mg/kg.
1 — North Caroilina DENR Inactive Hazardous Sites
Branch — Preliminary Soil Remediation Goals
(PSRG) Table (March 2015). Industrial Health
Based Soil PSRG and Protection of Groundwater
PSRG shown for comparison.
NOTES:
U = NOT DETECTED ABOVE LABORATORY REPORTING
LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J— = ESTIMATED CONCENTRATION BIASED LOW
PSRG: PRELIMINARY SOIL REMEDIATION GOAL
FT: FEET
MG/KG: MILLIGRAMS PER LITER
pG/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD
UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL
HEALTH STANDARD & PROTECTION OF
GROUNDWATER
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH — ASH
F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC < 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >: 50%
CROSS SECTION E-El
SOLID MATRIX ANALYTICAL RESULTS
0 1" 2"
FILENAME FIGURE 8-6.DWG SHEET
SCALE AS NOTED FIGURE 8-6
/W

ir
iL
-
-
-
, �-It
pim
0006, •
Ir
-L
_ `e. '
• i __ a _ •�'' — - _ _ . _ ♦ .fir �, -
444
ti
Av
r _ l Y•E !t. � -i �'Y+_ �.�t a.. Itv' '3 r'�•• - � - - -,•, �f' s�� � 1
le jr
46.
-' - - hS• \ f yt .``:'t3Y'.t�.�1 -it: �! 1.- ..'y`,f � :� �' -- � y`. �It�-�� Y � - ` _ `�
f �_ � • -.-r tC
J
` � '^� 1 ''. {�•1f --may^� I - � -' •t � , � � - - •f _ -I - � F _ �l t _ \ <
' J>_ i•,lT£''._r'��+�?Y�t "-�. _ mot!; a �'., �
3. t -' ' ••re -
pat...:• zlet
9.
It
•21 �- '.�,��! ,�,s Fps �- �+
4 PIP
-- r �•' ,� a s' •'• - ^�: {�
+'�rr�.s�•-�{4��_l• '1'/Tfz, --- •,* '> �i tyi. `- rsi � y.'�'�1e t_ s to �f � _S i..", i f ,� j�.1�?� ,..
.41
40
volm
meow
� � _ _ .I' _s• a s 1 �
�� -- - �'. - - - -+= J.-♦ �• - •-a• '�.t - -, t atr``r ++`i ��� r4Z I,��s ; i'>
IN
ft
`� r,� * 1 , � .fie-'. , • v' -i , +�- ` e� '- 4 -. - � � ' - t r
,• _ 1•,� —��1j' �-JS �} � - ,�, _ -- - � �` e -.� it — - ��S- - �,ti
' a �. - r `> 'fit �� ��_ � _ ■p ,,�•, ' • , r •� - +'�R.•f�� .r r • � . - 1� •
.ice_ IR _.LC •'! _ie.
NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.
2. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
3. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM NC DOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
4. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
5. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L .0107 (a).
6. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS MOUNTAIN ISLAND LAKE, NC.
SCALE (FEET)
200' 0 200'
400'
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH OR CINDER STORAGE AREA BOUNDARY
STREAM
TOPOGRAPHIC CONTOUR (4 FOOT)
SEEP AND SEDIMENT SAMPLE LOCATION
® SURFACE WATER SAMPLE LOCATIONS
fir NDPES IN -STREAM MONITORING LOCATION
SEEP AND SURFACE WATER SAMPLE LOCATIONS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROD NA
DATE
AUGUST 2015
FIGURE
91

ARSENIC CONCENTRATIONS IN GROUNDWATERDUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASINGASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
AUGUST 2015
10-1
MEAN CONCENTRATION BY COUNTY OF ARSENIC IN NC PRIVATE WELL WATER IN 2009 (µg/L)ADAPTED FROM SANDERS ET AL. (2011)
Approximate location of Riverbend Steam Station
Average arsenic concentration (µg/L)
STATE AND FEDERAL WATER STANDARDSDUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASINGASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
AUGUST 2015
10-2
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CONSTITUENTS OF INTEREST NEAR RIVERBEND STEAM STATION WITHTHEIR ASSOCIATED STATE AND FEDERAL DRINKING WATER STANDARDS
Approximate location of Riverbend Steam Station
MANGANESE AND SOIL REGIONSDUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASINGASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
AUGUST 2015
10-3
MANGANESE CONCENTRATIONS IN GROUNDWATER AND SOIL REGIONS OF NORTH CAROLINA(GILLESPIE 2013)
Approximate location of Riverbend Steam Station
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REGIONAL GROUNDWATER QUALITYDUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASINGASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
AUGUST 2015
10-4
MANGANESE CONCENTRATIONS IN GROUNDWATER (µg/L) IN A 20-MILE RADIUS SURROUNDING THE SITEUSGS NURE DATABASE
Legend
$Riverbend Site
Manganese (µg/L)
0.00 - 12.50
12.51 - 25.00
25.01 - 50.00
50.01 - 100.00
100.01 - 434.00
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THALLIUM DISTRIBUTION IN SOILDUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASINGASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
AUGUST 2015
10-5
THALLIUM CONCENTRATIONS IN C HORIZON OF SUBSTRATEUSGS MINERAL RESOURCES DATABASE
$+
$Approximate location of Riverbend Steam Station
$
REGIONAL GROUNDWATER QUALITY - VANADIUMDUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASINGASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
AUGUST 2015
10-6
VANADIUM CONCENTRATIONS IN GROUNDWATER (µg/L) IN A 20-MILE RADIUS SURROUNDING THE SITEUSGS NURE DATABASE
Legend
$Riverbend Site
Vanadium (µg/L)
-0.10 - 0.00
0.01 - 0.30
0.31 - 0.60
0.61 - 1.80
1.81 - 14.80
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REGIONAL GROUNDWATER QUALITYDUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASINGASTON COUNTY, NORTH CAROLINA
DATE
FIGURE
AUGUST 2015
10-7
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GROUNDWATER PH (STANDARD UNITS) IN A 20-MILE RADIUS SURROUNDING THE SITEUSGS NURE DATABASE
Legend
$Riverbend Site
pH
5.40 - 6.00
6.01 - 6.50
6.51 - 7.00
7.01 - 7.50
7.51 - 8.20
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NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATEAND ISAPPROXIMATE.
2. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
3. AS -BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY.
4. SHALLOW MONITORING WELLS (S) - WELL SCREEN INSTALLED ACROSS THE SURFICIAL WATER TABLE.
5. SHALLOW LOWER MONITORING WELLS (SQ - BOTTOM OF WELL SCREEN SETATTHEASH-REGOLITH INTERFACE.
6. INTERMEDIATE MONITORING WELLS (1) - WELL SCREEN INSTALLEDIN REGOLITH BELOW WATERTABLEAND BELOWASH INASH BASIN.
7. DEEP MONITORING WELLS (D) - WELL SCREEN INSTALLED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCK AND THE REGOLITH.
8. BEDROCK UPPER MONITORING WELLS (BRU) - WELL SCREEN INSTALLED IN COMPETENT BEDROCK IN THE FIRST15 FEETWHERE NOTRANSITION ZONE EXISTS.
9. BEDROCK MONITORING WELL (BR) - WELL SCREEN INSTALLED IN ROCK FRACTURE ZONE WITHIN COMPErENT BEDROCK.
10. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM NC DOT GEOGRAPHIC INFORMATION SYSTEM (GIS)WEBSITE.
11. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
12. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCACO2L.0107 (a).
13. SEEP SAMPLING LOCATIONS WERE OBTAINED BY HDR USING A TRIMBLE HANDHELDGPS UNIT ON APRIL 29,2014.
14. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS MOUNTAIN ISLAND LAKE, NC.
* INDICATES SEEP SAMPLING LOCATIONS WERE NOT RECORDED WITH GPS UNIT AND ARE APPROXIMATE.
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MONITORING WELL AND SAMPLE LOCATIONS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CARODNA
DATE
FIGURE
10-8

FLUSH -MOUNT STEEL
WELL MANHOLE COVER
LOCKABLE WELL PLUG
o
2'x2'X4" CONCRETE WELL PAD
-EXISTING GROUND
( STEEL MANHOLE SKIRT
PORTLAND CEMENT AND
BENTONITE MIX
GROUT SEAL
TO SURFACE
WELL CASING
(2-INCH DIA. SCH. 40 PVC)
B-INCH DIA. BOREHOLE
�FERSDEEP AND BEDROCK
OUTER CASING (6-INCH DIA.
SCH. 40 PVC FOR DEEP AND
BEDROCK WELLS)
TYPICAL FLUSH —MOUNT WELL COVER
SCALE: NTS
4-FT (TYP)
WELL PLUG
PROTECTIVE WELL VAULT
WITH LOCKING COVER
(2-FT MIN. HEIGHT) 2'x2'X4" CONCRETE WELL PAD
/ -EXISTING GROUND
GROUT SEAL TO SURFACE
WELL CASING
(2-INCH DIA. SCH. 40 PVC)
�I ----.BENTONITE SEAL
N
TOP OF SCREEN
FILTER SAND
I
O
2-INCH DIA. SCH. 40 PVC SCREEN
(0.010-INCH SLOT) WITH PRE -PACKED
FILTER SAND
THREADED PVC CAP
TYPICAL SHALLOW MONITORING WELL (Single Cased)
SCALE: NTS
ROTECTIVE WELL VAULT
'ITH LOCKING COVER
t-FT MIN. HEIGHT)
2'x2'X4" CONCRETE WELL PAD
PROTECTIVE BOLLARD FILLED WITH
CONCRETE AND PAINTED YELLOW
—0 (TYPICAL)
TYPICAL PROTECTIVE BOLLARDS
SCALE: NTS
PROTECTIV
WITH U
(2-FT
U
5
in
WELL PLUG
PROTECTIVE WELL VAULT
WITH LOCKING COVER
;RETE WELL PAD (2—FT MIN. HEIGHT) 2'x2'X4" CONCRETE WELL PAD
3 GROUND /- -EXISTING GROUND
TO SURFACE I I I II I I GROUT SEAL TO SURFACE
WELL CASING
. SCH. 40 PVC) N
w
(2—INCH DIA. SCH. 40 PVC)
BOREHOLE
8—INCH DIA. BOREHOLE
INCH DIA.
C) SET
C) SETAPPROX.
OUTER CASING (6—INCH DIA.
PARTIALLY
SCH. 40 PVC) SET APPROX.
ROCK
1—FOOT INTO COMPETENT BEDROCK
(V
I
EAL BENTONITE SEAL
N
EEN TOP OF SCREEN
FILTER SAND
SCH. 40 PVC SCREEN
SLOT) WITH PRE -PACKED
THREADED PVC CAP
TYPICAL DEEP MONITORING WELL (Double Cased)
SCALE: NTS
NOTES:
1. MONITORING WELLS WILL BE CONSTRUCTED IN ACCORDANCE WITH 15A NCAC 02C .0108 STANDARDS OF CONSTRUCTION: WELLS OTHER THAN
WATER SUPPLY.
2. PROTECTIVE COVERS TO BE PAINTED BRIGHT YELLOW WITH WEATHER RESISTANT PAINT.
3. WELL TAG IDS TO BE ATTACHED TO WELL PROTECTIVE COVER WITH MECHANICAL RIVETS OR SET INSIDE FLUSH -MOUNT WELL COVER.
4. PROTECTIVE BOLLARDS (CONE -TAPERED, FILLED WITH CONCRETE, AND PAINTED YELLOW) ARE TO BE INSTALLED AS NECESSARY FOR WELLS LOCATED
IN AREAS WITH NEARBY VEHICULAR TRAFFIC.
5. SLOPE 2' X 2' CONCRETE PAD SURFACE UPWARD TO PROTECTIVE COVER TO PREVENT PONDING WATER.
6. WELL ID TO BE ETCHED IN 2' X 2' CONCRETE PAD.
7. ALL CONSTRUCTION MEASUREMENTS ARE APPROXIMATE.
F)�
in
2-INCH DIA. SCH. 40 PVC SCREEN
(0.010-INCH SLOT) WITH PRE -PACKED
FILTER SAND
z
THREADED PVC CAP
w
PORTLAND CEMENT AND BENTONITE
GROUT MIX IF REQUIRED
BOTTOM OF BORING
TYPICAL BEDROCK MONITORING WELL (Double Cased)
SCALE: NTS
WELL CONSTRUCTION DETAILS
DUKE ENERGY CAROLINAS, LLC
ALLEN STEAM STATION ASH BASIN
DATE
August 2015
FIGURE
10-9

100
10
9 R7
A
8.8
6.25
�
4.39
A
5.65
3.02
4.65
3.19
2,76 2.84
1.8
14
2L Standard: 10 ug/I
1.34
1.28
µg/l. 10 -
1 NTU
0. 81
0.8v
5 5
5
5 5 5 5 5 5
5
s
5
5 5
5 5
1
0
Oct-10 Feb-11 Jun-11 Oct-11
Feb-12
Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tChromium ■ Chromium, diss (ug/1)—dr-Turbidity, field (NTU)
MW-7SR DATE
Chromium and Turbidity
DUKE ENERGY CAROLINAS, LLC AUGUST 2015
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY. NORTH CAROLINA

10000
1000
1710
1420
921
1000
182 634
509
100
310
2L Standard: 3GO µgJL 295 301
252
84.1
291
235 220
147 29.7
µg/L100
NTU
vNV 79 21.7
72
\/
8.19
\10.7 ® 7.73
10
■
10
6,92 6.95 _. 5.08
432 4.28
5.51
5.23
3.19
1
1
—
Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-1.4 Feb-15 Jun-15
Oct-10
+Iron, total (ug/1) ■ Iron, dins (ug/1) —A—Turbidity, field (NTU)
VW-10 DATE
Iron and Turbidity
AUGUST2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

1000
100
10
486
2L Standard: 300 µg/L
138
109
87 63 67
39 62 46
38
■
33
30 33
28
20
■ 14 5.07 5.44
6.13
•
3.44 2.72 / 3.53
2.41
3.34 2.48
2.05 2
2.35 .55
1.37
1
Oct-10
100
10 NTU
1
Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
+Iron, total (ug/1) IN Iron, diss (ug/1) —Turbidity, field (NTU)
M W-11 SR DATE
Iron and Turbidity
AUGUST2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

µg/L
100000
10000
1000
100
10
1
Oct-10
37700
30300
23000
24100
24100
19000
20600 19300
20900
16900
18300
19200
21100
/32500
21000
13500
7690
18.8
9.32
18.3
13.7
2L Standard: 300 µ lL
7.67
7.78
y
6.4
4.67
\
/
3.75'
\
.3..'6'.
3.14v
3-15 2.4
2.44
100
10 NTU
1
Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tlron, total (ug/I) ■ Iron, diss (ug/I) --*—Turbidity, field.(NTU)
M W-13 DATE
F)""Z Iron and Turbidity
AUGUST2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

1000
100
686
935
660
421
1
371 374
369
472
280
206
/,n
175
98
100
25.6
2LStandard:300µ lL
58
Y
14.4
A
12.9
µg/L
8.64
- 10 NTU
8.21
13
6.09
6.52
5.48
10
4.89 5.08
4.31
3.92
3.24
2.04
1.85
1 11
Oct-10 Feb-11 Jun-11
Oct-11
Feb-12 Jun-12 Oct-12 Feb-13
Jun-13 Oct-13 Feb-14 Jun-14 Oct-14
Feb-15 Jun-15
tlron, total (ug/1) ■ Iron, diss (ug/1)
—A—Turbidity, field (NTU)
M W-14 DATE
Iron and Turbidity
AUGUST2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

1000
100
465
399
274 4
227
168
230
160
198
2L Standard: 300 paS/L
100
44
1
75
58
74
v
v
72
55
40
13.2
45
µg/L
10.8 10.9
10 NTU
7.99
6.02
10
3:83
4.16
3.35
V2.15
2.59
273'
2.48
1:7T
1.5
1
1
Oct-10
Feb-11 Jun-11 Oct-11 Feb-12
Jun-12 Oct-12 Feb-13
Jun-13 Oct-13
Feb-14 Jun-14 Oct-14
Feb-7.5 Jun-15
tlron, total (ug/I) ■ Iron, diss (ug/1)
--*—Turbidity, field (NTU)
M W-15 Dare
Iron and Turbidity
AUGUST2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

me
1000
100
10
1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
—III—Iron, total (ug/1) ■ Iron, diss (ug/1) —*-Turbidity, field.(NTU)
10
1 NTU
0
M W-7SR DATE
F)""Z Iron and Turbidity
AUGUST2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

10000
1000
4160
2050
1680
1330
1480 1320
2410
954
1720
1000
217
1120
1 _
949 110
777
93.7
&
100
100
76
44
2L Stand�r41: 3 µg/L
72.4
6€
\32.6
µg/L 100
71 36
NTU
■
25
27.4
24.7
■
16
30
10
1
1
Oct-10
Feb-11 Jun-11
Oct-11 Feb-12 Jun-12 Oct-12
Feb-13 Jun-13 Oct-13 Feb-14
Jun-14 00-14 Feb-15 Jun-15
tlron, total (ug/1)
■ Iron, diss (ug/1) —Turbidity, field (NTU)
M W-8D DATE
Iron and Turbidity
AUGUST2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

10000 100
2460 2510
2100
38.7
37.2 51.6
32.2 32.2 43.2
1000
812 1410
643::2 618 629
593 618
942 976 497
787 853
2LStandard:300µWL 23 20.8
"n) 436
19.8
17.7 18.2
14.1 10.8
100
10
µg/L
NTU
9.87
44
■
■
10
1
1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tlron, total (ug/1) ■ Iron, diss (ug/1) —*—Turbidity, field.(NTU)
M W-81 UATE
F)""Z Iron and Turbidity
AUGUST2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

10000 1000
2440
1870 1950
1620
1110 1130
A A
1000
10fi0 569
139
100
464 2L Standard: 300 µg/L 263
381 209
49.7 341
272
37 220
A
µg/L 100
A 140
NTU
21.2
29.5
18.6
14.3 14.4 19
12.6
■
10
13 10.3
■
10
4.79
4.28
5.82
5.07
3.56
1
1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tlron, total (ug/1) ■ Iron, diss (ug/1) —Turbidity, field (NTU)
M W-9 UATE
F)""Z Iron and Turbidity
AUGUST2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

1000
1000
I
355
242
198
A
232
133
182
124
100
132
100
67
68
84.1
z
Z
Zac
72
dard: 50 µg/LNTU
37
48
29.7
36
µg/L
33
21.7
19
■
15
10
10
10.7
8.19
---
�7.�73
6.95
5.08
4.32 4.28
5.81
16
5.23
3.19
1
—
1
Oct-10
Feb-11 Jun-11
Oct-11 Feb-12
Jun-12 Oct-12
Feb-13 Jun-13
Oct-13 Feb-14 Jun-14
Oct-14 Feh-15
Jun-15
+Manganese, tot (ug/1)
■ Manganese, diss (ug/1)
—Turbidity, field (NTU)
MW-10 DATE
Manganese and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

1000 100
384
100
59
2L Standard: 50 µg/L
NTU
µg/L
10
4
11 2
30
17
14
12 5.44
16
1 13 12 10
10
12 8 $,
5.07 9
7
3.44 2.72 / 3,53
3.34 \ 2.41 2.48
—�
T
2.05
2.35 2.55
1.37
3
1
Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
Oct-10
+Manganese, tot (ug/1) ■ Manganese, diss (ug/1) (Turbidity, field (NTU)
MW-11 SR DATE
Manganese and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

100000
100
11200
10300
10000
10100 10500 10000
9330
10000
10500 1111 R070 g..
8760
10400
10300 10300
10300
10100
1000
18'8
18.3
13.7
NTU
µg/L
10
7.67
7.78
`A
9.32
100
6.4
4.67
5.26
2L Standard: 50 µg/L
/75
3.26
3.14 3.15 2.4
2.44
10
1
1
Oct-10 Feb-11 Jun-11
Oct-11 Feb-12 Jun-12 Oct-12
Feb-13 Jun-13 Oct-13 Feb-14 Jun-14
Oct-14
Feb-15 Jun-15
tManganese, tot (ug/I)
■ Manganese, diss (ug/I) —,Turbidity, field (NTU)
M W-13 Dare
Manganese and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

1000 100
353
270
193 185
205
1
126 32
100
4
25.6 81
63 90
55
12.9
56
14.4
NTU
43
NP./L
2L Standard: 50 4/1-4/1-10
\, I64�
8.21
8.fi52
20
4A9 &08
6.09
10
5.48
3.92
4.31
3.24
5 5
2.04
:LON
1
1
—
Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-:14 Feb-15 Jun-15
Oct-10
tManganese, tot (ug/1) ■ Manganese, diss (ug/1) —Turbidity, field (NTU)
M W-14 Dare
Manganese and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

100
100
86
58
52 53
21. Standard: 50 µg/L 50
45
.46 49 47 45 37 -
41
13.2
NTU
10
10
µg/L
10.8 10.9 7.99
6.02
4.16 3,35
V..3
2.48 2.59
2.73
1.77
2.15
1.5
1 1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tManganese, tot (ug/1) ■ Manganese, diss (ug/1) —Turbidity, field (NTU)
MW-15 DATE
Manganese and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

1000
8.8
10
9.17
6.25
413
5.66
4.39
4.65
256
304
I\V\
3.19
167
113
2.84
3.02
2.76
122
100
67
68
1.34
1 8
54
43 38 40
\V/31
33
NTU
1.28
49
` 41
1
2L Standard: 50 µg/L
0.8
0.81
10
1
0
Oct-10
Feb-11 Jun-11
Oct-11 Feb-12 Jun-12 Oct-12
Feb-13 Jun-13
Oct-13 Feb-14
Jun-14 Oct-14 Feb-15 Jun-15
tManganese, tot (ug/1)
■ Manganese, diss (ug/1)
—Turbidity, field (NTU)
MW-7SR DATE
Manganese and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

1000
1000
743
671
535
452
622
174
143
217
82
110 118
86
933
100
100
72.4
100
76
44
74
60
2L standard: 50 Ng/L
34
31
i
R/L
41.4
NTU
36
35
274
32.6
25
■
24.7
16
12
Is
10
10
■
5
1
1
Oct-10
Feb-11
Jun-11 Oct-11
Feb-12
Jun-12 Oct-12
Feb-13 Jun-13
Oct-13 Feb-14
Jun-14 Oct-14' Feb-15 Jun-15
tManganese, tot (ug/I)
■ Manganese, dins (ug/1)
—Turbidity, field (NTU)
M W-8D DATE
Manganese and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

100
1000
51.6
290
43.2
168
38.7
37.2
32.2
32.2
93
20.8
100
17.7
18.2
23
20.4 52
19.8
2L Standard: 50 µg/L
39
10.8
38
--7
32
14.1
9.97
43
23
47 30
NTU
µg/L
10
24
15
10
5
5
1
1
Oct-10
Feb-11 Jun-11 Oct-11
Feb-12 Jun-12 Oct-12
Feb-13 Jun-13
Oct-13 Feb-14
Jun-14 Oct-14 Feb-15 Jun-15
--#—Manganese, tot (ug/1)
■ Manganese, diss (ug/I)
—*—Turbidity, field (NTU)
MW-81 DATE
Manganese and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

1000
1000
282'
347
4
139
100
87
100
68
62
49
2L Standard: 50 µg/L
49.7
A
µg/L
25 25 37
-
NTU
29.5
20
19
21.2
A
18.6
14.3 14.4
10
10
12.6
10
10.3
7
7
5
■
5.82 5
5.07
5
4.79
4.21
3.56
1
1
Oct-10
Feb-11
Jun-11 Oct-11 Feb-12
Jun-12 Oct-12 Feb-13 Jun-13
Oct-13 Feb-14
Jun-14 Oct-14 Feb-15
Jun-15
—*—Manganese, tot (ug/I) ■ Manganese, diss (ug/I)
—*--Turbidity, field (NTU)
M W-9 UATE
Manganese and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

10
SU
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12
Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-1-5 May-15
pH (field) —i—Turbidity, field
M W-10 Dare
pH and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA
1000
100
NTU
10
1

10
10
3.4
2L Standard: 6.5 - 8.5SU
2.6
2.24 2.24
1.94
1.77
1.66
1.55
5.83 5 87
5.63 5.67 5.66 5.75 5.67 5.64 5.76 5.65
5.55
5.71 5.73 5.68
0.94 1.24 0.94
1 NTU
SU
y
0.68
x 0.64
0.18
x
0
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
+pH (field) —Turbidity, field
M W-11 DR DATE
pH and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

10
8
6
4
2
0
Sep-10
r _ate
jS;l;I 5.72 5.78 5.72 5.67
5.77 5.68
5.73 5.68 5.62
21-Standard: 6.5 - 8.55U
1,13
3.44 3.53
Y
5
5.07 .44
3.34
2.72
2.35
2.41 2.15 2.48
2.05
1.37
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
+pH (field) —Turbidity, field
MW-11SR
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST2015
FIGURE
Figure 10-
100
10 NTU
1

10
8
6
SU
4
2
6.27 6.35 18.8 18.3
6.22 6.29 6.18 6.28
6.13
5.99 5.97 5.8 5.86
6.17 6.13
5.97
13.7
2L Standard: 6.5 - 8.5SU 9.32
7 67 7.78
6.4
At
5.26
4.67
.75
3.26 3.14 i3aSe
2.44
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
+pH (field) —Turbidity, field
MW-13
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST2015
FIGURE
Figure 10-
100
10 NTU
1

10
8
6
SU
4
2
13.2
5.21 2L Standard: 6.5 - §.
5.16 5.19 5.07 5.2 5.1 5.19 5.11
5.06 5.05 5.07 5.1
5.29 10.8 10.9
7.99 6.02
3.83
4.16
3.35
2.73
2.48 2.59
2.15
1.77
1.5
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
tpH (field) —*--Turbidity, field
MW-15
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST2015
FIGURE
Figure 10-
100
10 NTU
1

10
8
6
SU
4
2
8.82
A
6.5
s�
4.73
3.25
3.04
3
2.05
2LStandard &5-8.55U
5.79 5.8
5.68 5.68
5.61 5.56
1.48
5.51 5.5
5.69 5.62 5.48
5.61 5.56
5,79
1.2
0.79
A
0.89
0.59
0.42
0.44
0.29
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
+pH (field) —*—Turbidity, field
M W-7D
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST2015
FIGURE
Figure 10-
10
1 NTU
0

10
8
6
5U
4
2
9.17 8.8
5.66
z z
4.65
4.39
2.76
3.02
A,--/
Y 3.19
2.84
1.8 2L Standard: 6.5-8.5SU
1.281.34
5.48
5.33 5.34 5.37 5 29
5.13 5.19
4.96 5.06 5.05 5.1 5,05
5.24
5.12
0.8
0.81
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
tpH (field) —*—Turbidity, field
MW-7SR
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST 2015
FIGURE
Figure 10-
10
1 NTU
0

Su
10
8
6
4
2
217
7
6.84 6.81 110
6.8 6.77 100 93.7
7.08
6.27 6.31 6.34 6.34 6.34
76 6.49 6.41 6.38 6.34 72.4
60 44
41.4
36 32.6
27.4
25
24.7
16
2L Standard: 6.5 - 8.5SU
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
--*--pH (field) —*--Turbidity, field
M W-8D
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST2015
FIGURE
Figure 10-
1000
100
NTU
10
1

10
8
6
Su
4
2
51,.6
43.2
37.2 38.7
,1 32.2
23
20.4 19.8 20.8
6.82 17.7 18.2
6.4 6.33 6.4. 6.4 6.38
14.1
�6��O9�,&,0 6 6.03 5.98 6.02 6.01 5.97
5.65
9 87 10.8
21-Standard: 6.5 - 8.5SU
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
--*--pH (field) (Turbidity, field
M W-81
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST2015
FIGURE
Figue 10-
100
10 NTU
1

10
SU
8
6
4
2
18
16
13.2
10.7
9.98 iLst d:6.5-assu 4.8 478
4.82
5.33 5.22 5.22 T
4.94
7 89 5.08 5.07
4.92
4.83 4.75
4.71 9.46
4.34
7.65 7.07 7.42
6.76
6.12
4.18
2.77 2.72
Y y
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
--*--pH (field) (Turbidity, field
M W-8S
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST2015
FIGURE
Figure 10-
100
10 NTU
1

10
1000
8
2L Standard: 6.5 - 8.5SU
100
6.1
5.95 6 6..4
6.4
5.99
6.29
6.
6.23
6.03
6.01 5.97 6.05
37
5.82
Su
A
NTU
18.6`
4
12.6
14.3
14.4
10
10.3
2
5.82 - "=�— 3.56
-f-----w-'
4.795.07
4.28
0
1
Sep-10
Jan-11
May-11 Sep-11
Jan-12 May-12 Sep-12 Jan-13
May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
tpH(field)
—*--Turbidity, field
M W-9 UATE
pH and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA

10
µg/L 1
0
8.82
6.5
4.73
3 3.04
3.25
1.48 2.05
1.2
1 1 1 1 1 1.04 1 2LStandard: lµg/L 1 1
1 � 1
1 1 1 1 1
0v
.89
0.74
0.59
0.44
0.42
0.29
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-1.5 Jun-15
tAntimony, tot (ug/1) ■ Antimony, dins (ug/1)—d—Turbidity, field (NTU)
MW-7D DATE
Antimony and Turbidity AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
Figure 10-
GASTON COUNTY, NORTH CAROLINA
10 1
NTU
1
0 1

100
2L Standard: 10 ug/I
10
pg/L
1
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—h—MW-7D(BG) tMW-8D --*- MW-81 --IFMW-11DR
MW-7D vs Deep Wells DATE
ChroER
Duke Cum inns AUGUST2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

100
14
10
µg/L
2L Standard10 ug/I
1
Sep-10
.Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—BMW-7SR(BG) tMW-10 tMW-11SR CIE—MW-13 MW-14 MW-15 BMW-8S MW-9
MW-7SR vs Shallow Wells DATE
Chromium (tot)
AUGUST 2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
to -
Gaston County, NORTH CAROLINA

10000
1000
-
2L Standard: 300 pWL
100
µg/L
■
■
20
■
■
10
® ®
®
®
®
■
®
i 10.
® 1
■
1
Sep-30 Jan-11
May-11
Sep-11
Jan-12
May-12
Sep-12
Jan-13 May-13 Sep-13
Jan-14 May-14
Sep-14 Jan-15
May-15
—BMW-7D (BG)
tMW-8D BMW-81 --IFMW-11DR
MW-7D vs Deep Wells DATE
Iron (tot) AUGUST 2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

100000
10000
1000
A Standard: 300 µg/L
100
10
1
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
->jr-MW-7SR(BG) BMW -SS tMW-9—*—MW-10 BMW-115R MW-13 BMW-14 —MW-15
MW-7SR vs Shallow Wells DATE
KR Iron (tot) AUGUST 2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

1000
.
100
■
2L Standard: 50 µg/L
■
µg/L
■
■
10
®
®
®
®
5
1
Sep-10
Jan-11
May-11
Sep-11
Jan-12
May-12
Sep-12
Jan-13
May-13
Sep-13
Jan-14
May-14
Sep-14 Jan-15
May-15
tMW-7D(BG)
tMW-8D BMW-81 --M-MW-11DR
MW-71D vs Deep Wells DATE
EReli(tot, AUGUST2015
DukeCaro
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

100000
-
10000
-
0
EA00
1000
µ6/L
-
7
I
353
9 . .
.
.
■
.
185
.
.
132
100
or
6
00,■
2L Standard: 50 µg/L 43
8.4
®
32
■
®
18
4
10
■
.
.
4
1
,
Sep-10
Jan-11 May-11
Sep-11
Jan-12 May-12
Sep-12
Jan-13 May-13
Sep-13 Jan-14
May-14
Sep-14
Jan-15
May-15
t MW-11SR fMW-7SR(BG)
—0I
t MW-9 --IFMW-10
MW-13 MW-14
MW-15
MW-7SSR vs Deep Wells DATE
ERManganese (tot) AUGUST 2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

9
9
21-Standard: 6.5 - 8.5 SU
8
8
7
7
SU
6
6
5
5
4
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—vk—MW-7D(BG) tMW-8D tMW-81 --)rMW-11DR
MW-7D vs Deep Wells DATE
pH, field
AUGUST2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

9
� -
8
2L Standard: 6.5 - 8.5 SU
7
6.95
6.86 6.79 6.8 6.81 6.71 6.73 6.79 6.85 5.74 6.73 6.76
6.63 6.64 6.64
6
5
SU
4
3
-
2
1
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—rir--MW-75R(BG) +MW-8S tMW-9 --)IFMW-10 BMW-11SR +MW-13 BMW-14 —MW-15
MW-7SR vs Shallow Wells DATE
F)""Z pH, field
Duke Carolinas, LLC AUGUST 2015
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

10
i
1
pg/L
0
• ! ■ i i ■ ■ f ■ i ■ ! ■ �
2L Standard: 1 ug/I
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—BMW-7D (BG) +MW-8D +MW-81 --I—MW-11DR
MW-7D vs DeepWells DATE
KP Antimony (tot) AUGUST 2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

10
M/L
2L Standard: 1 ug/I
0
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
--A—MW-7SR(BG) BMW-10 tMW-11SR-If—MW-13 —MW-14 MW-15 BMW-8S —MW-9
MW-7SR vs Shallow Wells DATE
ERAntimony (tot) AUGUST 2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

10
2L Standard: lug/I
ug/I 1
IN M 0 M IN 0 0 01
0
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
MW-10 tMW-11DR —BMW-115R —04—MW-13 MW-14 MW-15 MW-8D MW-81 MW-8S tMW-9
Stacked Time Series Plots - Compliance Wells DATE
Antimony AUGUST 2015
Duke Energy Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
Figure 10-
Gaston County, NORTH CAROLINA

100,000
10,000
1,000
ug/1
300
2L Standard:
100
ON
IL
10
1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tMW-10 t—MW-11DR MW-11SR —0—MW-13—0—MW-14 MW-15 MW-80 MW-8I MW-8S tMW-9
Stacked Time Series Plots - Compliance Wells DATE
Iron AUGUST 2015
Duke Energy Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
Figure 10-
Gaston County, NORTH CAROLINA

100,000
10,000
1,000
ug/I
1-7
100
2L Standard: g/I
10
eor
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tMW-10—FMW-I1DR fMW-11SR --(—MW-13—w—MW-14 BMW-15 +MW-8D —MW-81 —MW-85 tMW-9
Stacked Time Series Plots - Compliance Wells DATE
Manganese AUGUST 2015
Duke Energy Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
Figure10-
Gaston County, NORTH CAROLINA

ug/1
10
1
Oct-10
2L Standard: 10 ug/1
Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tMW-10 tMW-11DR—1rMW-11SR-I—MW-13 —OK—MW-14 — MW-15 MW-8D —MW-81 —MW-SS +MW-9
Stacked Time Series Plots - Compliance Wells DATE
Chromium AUGUST 2015
Duke Energy Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
Figure 10-
Gaston County, NORTH CAROLINA

9
8
7
2L Standard: 6.5 - 8.5 SU
6
5
SUI 4
3
2
1
0 -,
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tMW-10 -41-MW-11DR fMW-11SR -0-BMW-13 --IFMW-14 tMW-15 +MW-8D —MW-81 —MW-85 tMW-9 —Seriesl—Series2
Stacked Time Series Plots - Compliance Wells DATE
PH AUGUST 2015
Duke Energy Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
Figure10-
Gaston County, NORTH CAROLINA

1000
Ratios > 1 signify concentration greater than concentration in background well.
44
100
072
109.032
® ® 97;. -- 7.719
70.5
®
®
43.190
8.722 36.923
®
43;6
4.051
19.520
17.281
2.343
10
21LStandard: 300 Ng/L
O
';�
6.561
7.290
0
4. 32
.976
221
3. 1
/2.575
2.3941.96
2.903
342.141
005
1.4 ■■
■ ■
.584
c
a 1
.872
:gap
76BB
0.90
0.733
.658
0.661
v
S
542
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Sep-30
Jan-11
May-11 Sep-11 Jan-12 May-12 Sep-12
Jan-13 May-13 Sep-13 Jan-14 May-14
Sep-14 Jan-15 May-15
-BMW-81/MW-7D
+MW-11DR/MW-7D +MW-10/MW-7SR-IFMW-11SR/MW-7SR
tMW-13/MW-7SR --MW-14/MW-7SR
-MW-15/MW-7SR-MW-8S/MW-7SR
tMW-9/MW-7SR
Correlation Plot - Compliance Wells vs. Background DATE
FY� Iron (tot) AUGUST 2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

1000
Ratios > 1 signify concentration greater than concentration in background well.
5.8065
265.78195
000
3.2500
153.7313
162.2222
118.6765
100
All
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May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 .Jan-14
May-14
Sep-14 Jan-15
May-15
-9jr-MW-81/MW-7D
BMW-11DR/MW-7D tMW-8S/MW-7SR --)I(-MW-9/MW-7SR tMW-10/MW-7SR
MW-11SR/MW-7SR BMW-13/MW-7SR
-MW-14/MW-7SR
-4-MW-15/MW-7SR
Correlation Plot - Compliance Well vs. Background DATE
Manganese (tot) AUGUST 2015
Duke Carolinas,, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

10
Ratios > 1 signify concentration greater than concentration in background well.
0
c
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c
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m
c
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V
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Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—rhr-MW-81/MW-7D tMW-11DR/MW-7D tMW-10/MW-7SR—W—MW-11SR/MW-7SR tMW-13/MW-7SR +MW-14/MW-7SR—MW-15/MW_7SR—MW-8S/MW-7SR—*—MW-9/MW-7SR
Correlation Plot - Compliance Well vs. Background DATE
Ch
Duke Cum inns AUGUST2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

1.6
Ratios > 1 signify concentration greater than concentration in background well.
2L Standard: 6.5 - 8.5 SU
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Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—dr-MW-81/MW-7D tMW-11DR/MW-7D tMW-10/MW-7SR—W—MW-11SR/MW-7SR tMW-14/MW-7SR—0—MW-15/MW-7SR BMW-8S/MW-7SR—MW-9/MW7SR
Correlation Plot - Compliance Well vs. Background DATE
ER(fipH
eld)
Dukear AUGUST2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

0
10
Ratios > 1 signify concentration greater than concentration in background well.
0 1 1
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13
—91r-MW-81/MW-7D tMW-11DR/MW-7D +MW-10/MW-7SR —I--MW-11SR/MW-7SR tMW-13/MW-7SR
Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
MW-14/MW-7SR MW-15/MW-7SR—MW-8S/MW-7SR tMW-9/MW-7SR
Correlation Plot - Compliance Well vs. Background DATE
KR Antimony (tot) AUGUST 2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-
Gaston County, NORTH CAROLINA

Figure 10-61 through 10-117 Unused
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GROUNDWAT ER ANALYT ICAL RESULT S – PLAN VIEW (2L EXCEEDANCES)
GASTON COUNTY, NORTH CAROLINA
PAT

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DATE
FIGURE
AUGUST 2015
10-TBD
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND ST EAM ST AT ION ASH BASIN
LEGEND
&<ASH BASIN ASSESSMENTGROUNDWATER MONITORING WELL
&<ASH BASIN COMPLIANCEGROUNDWATER MONITORING WELL
&<ASH BASIN VOLUNTARY GROUNDWATERMONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARYCOINCIDENT WITH DUKE ENERGYPROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
NOTES:U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMITJ = ESTIMATED CONCENTRATION<3.0 = LESS THAN THE LABORATORY REPORTING LIMITJ+ = ESTIMATED CONCENTRATION BIASED HIGHJ- = ESTIMATED CONCENTRATION BIASED LOW
µG/L: MICROGRAMS PER LITER
Antimony 6.3Chromium 49.2Cobalt 2.9Iron 370Vanadium 20
AB-1DAnalyte (µg/L)Antimony 3.2Cobalt 15.9Iron 510Manganese 250Vanadium 1.8
AB-1SAnalyte (µg/L)
Chromium 13Vanadium 32.4
AB-2DAnalyte (µg/L)Antimony 3.1Cobalt 17.1Iron 1,700Manganese 330Vanadium 3.8
AB-2SAnalyte (µg/L)
Chromium 51Total Dissolved Solids 946,000Vanadium 11.5
AB-3DAnalyte (µg/L)
Antimony 1.2Vanadium 24
AB-4DAnalyte (µg/L)
Antimony 1.2Vanadium 12.5
AB-5DAnalyte (µg/L)
Analyte (µg/L) Sample 1 Sample 2Antimony *DNE 2.5Cobalt *DNE 1.8Iron *DNE 970Vanadium 11.9 18.6
AB-6BRU
Antimony 1.8Iron 730Vanadium 25.2
AB-6SAnalyte (µg/L)
Antimony 7.5Chromium 24.7Vanadium 40.5
AB-7DAnalyte (µg/L)Cobalt 1.6Iron 380Manganese 85
AB-7IAnalyte (µg/L)
Manganese 140Vanadium 2.7
AB-8DAnalyte (µg/L)Manganese 150Vanadium 0.79 J
AB-8SAnalyte (µg/L)
Antimony 3Chromium 903Vanadium 14.4
AS-1DAnalyte (µg/L)Boron 2,200Cobalt 5.4Iron 660Manganese 1,900Total Dissolved Solids 750,000 J-Vanadium 1.6 J+
AS-1SAnalyte (µg/L)
Chromium 22.5Vanadium 34.6
AS-2DAnalyte (µg/L)Chromium 44.8Cobalt 12.4Iron 2,090Manganese 640Vanadium 3.9
AS-2SAnalyte (µg/L)
Antimony 1.6Chromium 23.5Vanadium 18.2
AS-3DAnalyte (µg/L)
Cobalt 3Iron 2,200Manganese 300Vanadium 5.9
BG-1SAnalyte (µg/L)
Iron 930Manganese 63Vanadium 3.7
BG-3DAnalyte (µg/L)Antimony 1.3 J+Manganese 240Vanadium 0.75 J+
BG-3SAnalyte (µg/L)
Arsenic 25.8Cobalt 102Iron 175,000Manganese 3,200Sulfate 559,000Total Dissolved Solids 1,110,000Vanadium 4
C-1SAnalyte (µg/L)
Vanadium 10.9
C-2DAnalyte (µg/L)Cobalt 39.7Manganese 600Vanadium 0.52 J
C-2SAnalyte (µg/L)
Antimony 3.2Iron 720Vanadium 21
GWA-1DAnalyte (µg/L)Chromium 11.6Cobalt 2.1Iron 1,800Manganese 110Vanadium 7.9
GWA-1SAnalyte (µg/L)
Vanadium 11.8
GWA-2BRAnalyte (µg/L)Iron 590
Manganese 95 87.2 Vanadium 2.3
GWA-2SAnalyte (µg/L)
Cobalt 1.1Manganese 9,200Sulfate 1,310,000Total Dissolved Solids 2,390,000Vanadium 4.6
GWA-3DAnalyte (µg/L)
Cobalt 4.5Manganese 190
GWA-5SAnalyte (µg/L)
Chromium 24.8Vanadium 28
GWA-6DAnalyte (µg/L)Cobalt 27.6Iron 1,100Manganese 1,300Vanadium 4.8
GWA-6SAnalyte (µg/L)
Vanadium 10.9
GWA-7BRAnalyte (µg/L)Iron 440Vanadium 12.1
GWA-7DAnalyte (µg/L)Iron 790Vanadium 3.5 J+
GWA-7SAnalyte (µg/L)
Iron 1,300Manganese 96
GWA-8DAnalyte (µg/L)Manganese 720
GWA-8SAnalyte (µg/L)
Manganese 90Vanadium 2.8
GWA-9DAnalyte (µg/L)Cobalt 50.1Manganese 2,900Vanadium 0.52 J+
GWA-9SAnalyte (µg/L)
Antimony 1.1Vanadium 6.8
GWA-10DAnalyte (µg/L)Cobalt 10Manganese 250Vanadium 0.62 J
GWA-10SAnalyte (µg/L)
Vanadium 22.4
MW-15DAnalyte (µg/L)Vanadium 2.2
MW-15BRAnalyte (µg/L)
Antimony 2.3Vanadium 7.8
MW-9BRAnalyte (µg/L)Analyte (µg/L) Sample 1 Sample 2Antimony 5.4 2.7Chromium 20.6 27Vanadium 12.5 12.8
MW-9D
Cobalt 1.3Vanadium 2.7
MW-15Analyte (µg/L)
Vanadium 6.2
MW-3DAnalyte (µg/L)
Vanadium 1.1
MW-4DAnalyte (µg/L)
Manganese 68Vanadium 0.6 J+
MW-3SAnalyte (µg/L)
Vanadium 2.1
MW-11DRAnalyte (µg/L)Vanadium 1.4
MW-11SRAnalyte (µg/L)
Vanadium 4.7
MW-2DAnalyte (µg/L)
Manganese 530Vanadium 2.1 J+
MW-1DAnalyte (µg/L)Cobalt 61Iron 30,800Manganese 2,600
MW-1SAnalyte (µg/L)
Vanadium 1.2
MW-10Analyte (µg/L)
Vanadium 2.7
MW-9Analyte (µg/L)
Cobalt 1.1Iron 2,700Vanadium 4.1
MW-8DAnalyte (µg/L)Iron 2,100Vanadium 2.8
MW-8IAnalyte (µg/L)Manganese 57Vanadium 0.32 J+
MW-8SAnalyte (µg/L)
Vanadium 2.6 J+
MW-14Analyte (µg/L)
Cobalt 23.7Iron 15,700Manganese 8,300
MW-13Analyte (µg/L)
Vanadium 8.6
MW-5DAnalyte (µg/L)
Vanadium 0.35 J
MW-6SAnalyte (µg/L)Vanadium 3.8
MW-6DAnalyte (µg/L)
Cobalt 18.4Iron 420Manganese 12,700Sulfate 1,420,000Total Dissolved Solids 23,000,000Vanadium 1.3
GWA-3SAAnalyte (µg/L)
500 0 500 1,000
SCALE (FEET)
Cobalt 1.64Iron 4,440Manganese 87Vanadium 32.1
AB-3BRAnalyte (µg/L)Analyte (µg/L) Sample 1 Sample 2Antimony *DNE 1.7Arsenic 283 *DNECobalt 1.9 *DNEIron 6,500 990Manganese 910 730Total Dissolved Solids *DNE 519,000Vanadium 11.3 4.9
AB-3S
Manganese 1,200
AB-4SAnalyte (µg/L)
Antimony 21.6Arsenic 651Boron 1,400Iron 660Thallium 0.48Vanadium 231
AB-5SAnalyte (µg/L)Antimony 3.2Arsenic 75.1Boron 2,400Vanadium 151
AB-5SLAnalyte (µg/L)
Arsenic 24.3Cobalt 13.4Iron 11,200
Manganese 1,300 1,340 Vanadium 1.1
AB-7SAnalyte (µg/L)
Antimony 3.3Chromium 32.3Cobalt 1.3Iron 1,500Total Dissolved Solids 555,000Vanadium 22
BG-1DAnalyte (µg/L)
Iron 760 JVanadium 4.6
BG-2BRAnalyte (µg/L)Chromium 57.5Vanadium 29.9
BG-2DAnalyte (µg/L)Manganese 370Vanadium 0.35 J
BG-2SAnalyte (µg/L)
Chromium 186Cobalt 1.9Iron 660Sulfate 376,000 J+Thallium 3.2Total Dissolved Solids 2,900,000Vanadium 2.1
GWA-20DAnalyte (µg/L)Chromium 133Cobalt 12.7Iron 9,500Manganese 320Vanadium 23
GWA-20SAnalyte (µg/L)Chromium 108Vanadium 4.33
GWA-22BRAnalyte (µg/L)Antimony 1.4Chromium 174Cobalt 3.4Iron 2,600Manganese 120Vanadium 18.5
GWA-22DAnalyte (µg/L)Antimony 2.2Cobalt 1.3
GWA-22SAnalyte (µg/L)Chromium 15.6Total Dissolved Solids 790,000Vanadium 5.3
GWA-23BRAnalyte (µg/L)Cobalt 3.3Iron 530Manganese 82
GWA-23SAnalyte (µg/L)
Antimony 18.2Chromium 46Iron 1,500Manganese 61Total Dissolved Solids 18,100,000Vanadium 4
GWA-2BRUAnalyte (µg/L)
Vanadium 2.4
GWA-4DAnalyte (µg/L)Cobalt 1.7Manganese 120Vanadium 0.84 J
GWA-4SAnalyte (µg/L)
Chromium 24.5Vanadium 13.9
GWA-5DAnalyte (µg/L)
Antimony 4.5Arsenic 10.7Chromium 40.6Iron 450Vanadium 67.5
GWA-9BRAnalyte (µg/L)
Chromium 24.7Total Dissolved Solids 1,180,000Vanadium 2.1
MW-7BRAnalyte (µg/L)
Analyte CAS No.NC 2L GroundwaterIMAC1
Antimony 7440-36-0 1*Arsenic 7440-38-2 10Barium7440-39-3 700Beryllium7440-41-7 4*Boron 7440-42-8 700Cadmium7440-43-9 2Chloride**16887-00-6 250,000Chromium7440-47-3 10Cobalt7440-48-4 1*Copper**7440-50-8 1,000Iron7439-89-6 300Lead7439-92-1 15Manganese7439-96-5 50Mercury7439-97-6 1Nickel7440-02-0 100Nitrate**14797-55-8 10,000Nitrite as N**14797-65-0 1,000Selenium7782-49-2 20Sulfate**14808-79-8 250,000Thallium7440-28-0 0.2Total Dissolved Solids** TDS 500,000Vanadium7440-62-2 0.3*Zinc**7440-66-6 1000* Interim Maximum Allowable Concentration (IMAC)
All units shown in µg/L.
** Unit reported in mg/L in standard, converted here to µg/L to match units displayed on figure.
1 - North Carolina 15A NCAC 02L.0202 Groundwater Standards (As of 4/2013). Interim Maximum Allowable Concentration shown where no standard is available for comparison.
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AABB--22SS33..11 ((33..44 ))
AB-6SAB-6S1.8 1.8 (1.7 )(1.7 )
AB-7IAB-7I1J+ 1J+ (3.6 )(3.6 )
AB-8SAB-8S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
AS-1SAS-1S0.26J (0.23J)0.26J (0.23J)
AS-2SAS-2S0.21J (0.18J)0.21J (0.18J)BG-1SBG-1S0.43J (0.23J)0.43J (0.23J)
BG-2SBG-2S0.33J (0.25J)0.33J (0.25J)
BG-3SBG-3S1.3J+1.3J+ (1.4J+)(1.4J+)
C-2SC-2S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-10SGWA-10S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-1SGWA-1S0.28J (0.22J)0.28J (0.22J)
GWA-20SGWA-20S0.22J (˂0.5U)0.22J (˂0.5U)GWA-22SGWA-22S2.2 2.2 (3.5 )(3.5 )
GWA-23SGWA-23S0.24J (˂0.5U)0.24J (˂0.5U)
GWA-2SGWA-2S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-3SAGWA-3SA0.77J+ (0.6J+)0.77J+ (0.6J+)
GWA-4SGWA-4S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-5SGWA-5S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-6SGWA-6S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-7SGWA-7S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-8SGWA-8S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-9SGWA-9S0.5UJ (0.5UJ)0.5UJ (0.5UJ)
MW-10MW-10˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-11SRMW-11SR0.87 (0.72 )0.87 (0.72 )
MW-13MW-130.5UJ (0.5UJ)0.5UJ (0.5UJ)
MW-14MW-140.5UJ (0.5UJ)0.5UJ (0.5UJ)
MW-15MW-15˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-1SMW-1S0.5UJ (0.5UJ)0.5UJ (0.5UJ)
MW-3SMW-3S0.5UJ (0.5UJ)0.5UJ (0.5UJ)
MW-5SMW-5S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-6SMW-6S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-8IMW-8I0.5UJ (0.5UJ)0.5UJ (0.5UJ)MW-8SMW-8S0.83J+ (0.4J+)0.83J+ (0.4J+)
MW-9MW-9˂0.5U (˂0.5U)˂0.5U (˂0.5U)
ANTIMONY ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
IMAC CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-119
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR ANTIMONY IS 1 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
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AB-2DAB-2D1 (0.85 )1 (0.85 )
AB-3DAB-3D0.22J (˂0.5U)0.22J (˂0.5U)
AABB--44DD11..22 ((11..44 ))
AB-5DAB-5D1.2 1.2 (0.58 ) (0.58 )
AB-7DAB-7D7.5 7.5 (7.2J+)(7.2J+)
AB-8DAB-8D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
AS-1DAS-1D3 3 (2.7 )(2.7 )
AS-2DAS-2D1J+ 1J+ (1.3J+)(1.3J+)
AS-3DAS-3D1.6 1.6 (1.2 )(1.2 )BBGG--11DD33..33 ((33..99 ))
BG-2DBG-2D0.72 (0.63 )0.72 (0.63 )
BG-3DBG-3D0.16J (˂0.5U)0.16J (˂0.5U)
C-2DC-2D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-10DGWA-10D1.1 1.1 (˂0.5U) (˂0.5U)
GWA-1DGWA-1D3.2 3.2 (2.6 )(2.6 )
GWA-20DGWA-20D˂0.5U (˂0.5U)˂0.5U (˂0.5U)GWA-22DGWA-22D1.4 1.4 (˂0.5U) (˂0.5U)
GWA-23DGWA-23D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-3DGWA-3D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-4DGWA-4D˂0.5U (0.17J)˂0.5U (0.17J)
GWA-5DGWA-5D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-6DGWA-6D0.25J (0.25J)0.25J (0.25J)
GWA-7DGWA-7D0.17J (˂0.5U)0.17J (˂0.5U)
GWA-8DGWA-8D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-9DGWA-9D0.5UJ (0.5UJ)0.5UJ (0.5UJ)
MW-11DRMW-11DR0.590.59
MW-15DMW-15D0.74 (0.74 )0.74 (0.74 )
MW-1DMW-1D0.5UJ (0.5UJ)0.5UJ (0.5UJ)
MW-2DMW-2D0.5UJ (0.5UJ)0.5UJ (0.5UJ)
MW-3DMW-3D0.5UJ (0.5UJ)0.5UJ (0.5UJ)
MW-4DMW-4D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-5DMW-5D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-6DMW-6D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-8DMW-8D0.21J+ (0.5UJ)0.21J+ (0.5UJ)
MW-9DMW-9D5.4 5.4 (16.8 )(16.8 )
ANTIMONY ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
IMAC CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-120
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR ANTIMONY IS 1 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
&<1 1
1 1 1
1
11
11
0 0 ..5 5
0 .5 0 .5
0 0 ..5 5
0.50.5
00..55
S R -2 0 7 4
S R -1 9 1 2
AB-3BRAB-3BR˂1U (˂1U)˂1U (˂1U)
AB-6BRUAB-6BRU2.5 2.5 (0.29J) (0.29J)
BG-2BRBG-2BR˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-20BRGWA-20BR˂1U (˂1U)˂1U (˂1U)
GWA-22BRGWA-22BR˂1U (˂1U)˂1U (˂1U)
GWA-23BRGWA-23BR˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-2BRGWA-2BR0.24J (0.25J)0.24J (0.25J)
GWA-2BRUGWA-2BRU18.2 18.2 (22.4 )(22.4 )
GWA-4BRGWA-4BR˂1U ˂1U (1.41 )(1.41 )
GWA-7BRGWA-7BR0.96 (0.25J)0.96 (0.25J)
GWA-9BRGWA-9BR4.54.5
MW-15BRMW-15BR0.25J (0.21J)0.25J (0.21J)
MW-7BRMW-7BR0.86 (0.22J)0.86 (0.22J)
MW-9BRMW-9BR2.3 2.3 (1.3 )(1.3 )
ANTIMONY ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
IMAC CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-121
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR ANTIMONY IS 1 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
1 1
0 0 ..5 5
0
0
.
.
5
5
00 ..55
S R -2 0 7 4
S R -1 9 1 2
AB-1SAB-1S0.17J (0.14J)0.17J (0.14J)
AB-2SAB-2S0.2J (˂0.5U)0.2J (˂0.5U)
AB-6SAB-6S0.82 (0.88 )0.82 (0.88 )
AB-7IAB-7I˂0.5U (0.12J)˂0.5U (0.12J)
AB-8SAB-8S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
AS-1SAS-1S1.4 (0.95 )1.4 (0.95 )
AS-2SAS-2S0.42J (˂0.5U)0.42J (˂0.5U)BG-1SBG-1S0.21J (˂0.5U)0.21J (˂0.5U)
BG-2SBG-2S0.12J (0.14J)0.12J (0.14J)
BG-3SBG-3S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
C-2SC-2S0.95J+ (0.86 )0.95J+ (0.86 )
GWA-10SGWA-10S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-1SGWA-1S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-20SGWA-20S3.3 (˂0.5U)3.3 (˂0.5U)GWA-22SGWA-22S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-23SGWA-23S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-2SGWA-2S0.28J (0.14J)0.28J (0.14J)
GWA-3SAGWA-3SA0.23J (0.21J)0.23J (0.21J)
GWA-4SGWA-4S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-5SGWA-5S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-6SGWA-6S0.24J+ (0.17J)0.24J+ (0.17J)
GWA-7SGWA-7S0.2J+ (˂0.5U)0.2J+ (˂0.5U)
GWA-8SGWA-8S˂0.5U (0.18J)˂0.5U (0.18J)
GWA-9SGWA-9S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-10MW-100.16J (˂0.5U)0.16J (˂0.5U)
MW-11SRMW-11SR˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-13MW-130.39J (0.36J)0.39J (0.36J)
MW-14MW-14˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-15MW-150.25J (˂0.5U)0.25J (˂0.5U)
MW-1SMW-1S˂0.5U (0.49J)˂0.5U (0.49J)
MW-3SMW-3S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-5SMW-5S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-6SMW-6S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-8IMW-8I0.12J (˂0.5U)0.12J (˂0.5U)
MW-8SMW-8S˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-9MW-90.18J (0.12J)0.18J (0.12J)
ARSENIC ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-122
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR ARSENIC IS 10 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
1 1
11
11
0 .50.5
0 .50 .5
0.50.5
0 .50.5
0.5
0.5
0.50.5
0.50.5
S R -2 0 7 4
S R -1 9 1 2
AB-1DAB-1D0.84 (0.51 )0.84 (0.51 )
AB-2DAB-2D0.72 (0.67 )0.72 (0.67 )
AB-3DAB-3D0.49J (˂0.5U)0.49J (˂0.5U)
AB-4DAB-4D0.65 (0.6 )0.65 (0.6 )
AB-5DAB-5D0.25J (0.45J)0.25J (0.45J)
AB-7DAB-7D2.2 (1.9 )2.2 (1.9 )
AB-8DAB-8D0.17J (0.31J)0.17J (0.31J)
AS-1DAS-1D0.68 (0.32J)0.68 (0.32J)
AS-2DAS-2D0.66 (0.43J)0.66 (0.43J)
AS-3DAS-3D0.97 (0.87 )0.97 (0.87 )BG-1DBG-1D2 (2.1 )2 (2.1 )
BG-2DBG-2D0.66 (0.6 )0.66 (0.6 )
BG-3DBG-3D0.81 (0.38J)0.81 (0.38J)
C-2DC-2D1.3J+ (1.3 )1.3J+ (1.3 )
GWA-10DGWA-10D0.29J (0.36J)0.29J (0.36J)
GWA-1DGWA-1D0.93 (0.82 )0.93 (0.82 )
GWA-20DGWA-20D0.64 (0.27J+)0.64 (0.27J+)GWA-22DGWA-22D0.91 (0.78 )0.91 (0.78 )
GWA-23DGWA-23D0.9 (0.82J+)0.9 (0.82J+)
GWA-3DGWA-3D0.65 (0.72 )0.65 (0.72 )
GWA-4DGWA-4D0.22J (0.28J)0.22J (0.28J)
GWA-5DGWA-5D0.96 (1.1 )0.96 (1.1 )
GWA-6DGWA-6D1J+ (1 )1J+ (1 )
GWA-7DGWA-7D0.48J (0.46J)0.48J (0.46J)
GWA-8DGWA-8D˂0.5U (0.12J)˂0.5U (0.12J)
GWA-9DGWA-9D0.13J (˂0.5U)0.13J (˂0.5U)
MW-11DRMW-11DR˂0.5U˂0.5U
MW-15DMW-15D1 (1.2 )1 (1.2 )
MW-1DMW-1D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-2DMW-2D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-3DMW-3D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-4DMW-4D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-5DMW-5D˂0.5U (0.12J)˂0.5U (0.12J)
MW-6DMW-6D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-8DMW-8D0.32J (0.12J)0.32J (0.12J)
MW-9DMW-9D0.38J (0.28J)0.38J (0.28J)
ARSENIC ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-123
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR ARSENIC IS 10 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
&<
11
11
1 1
11 00
0.50.5
0 .5 0 .5
0 .5 0 .5
0 .50 .5
0.5
0.5
0.50.5
0.5
0.5
S R -2 0 7 4
S R -1 9 1 2
AB-3BRAB-3BR1.23 (˂1U)1.23 (˂1U)
AB-6BRUAB-6BRU0.75 (0.21J)0.75 (0.21J)
BG-2BRBG-2BR0.28J (0.12J)0.28J (0.12J)
GWA-20BRGWA-20BR˂1U (˂1U)˂1U (˂1U)GWA-22BRGWA-22BR˂1U (˂1U)˂1U (˂1U)GWA-23BRGWA-23BR0.28J (˂0.5U)0.28J (˂0.5U)
GWA-2BRGWA-2BR1.3 (1.4 )1.3 (1.4 )
GWA-2BRUGWA-2BRU0.36J (0.18 )0.36J (0.18 )
GWA-4BRGWA-4BR˂1U (˂1U)˂1U (˂1U)
GWA-7BRGWA-7BR0.29J (0.23J)0.29J (0.23J)
GWA-9BRGWA-9BR10.710.7
MW-15BRMW-15BR0.78 (0.68 )0.78 (0.68 )
MW-7BRMW-7BR0.23J (0.24J)0.23J (0.24J)
MW-9BRMW-9BR0.69 (0.52 )0.69 (0.52 )
ARSENIC ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-124
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR ARSENIC IS 10 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
4
0
0
4
0
0
1 0 01 0 0
1 0 0100
1 1 0 0 0 0
1 1 0 0 0 0
1 0 0
1 0 0
1
0
0
1
0
0
100100
100
100
4 0 040 0
770000
5 05 0
5 050
5 0
5 0
5 5 0 0
5050
5050
S R -2 0 7 4
S R -1 9 1 2
AB-1SAB-1S˂50U (˂50U)˂50U (˂50U)
AB-2SAB-2S˂50U (˂50U)˂50U (˂50U)
AB-6SAB-6S45J (41J)45J (41J)
AB-7IAB-7I˂50U (˂50U)˂50U (˂50U)
AB-8SAB-8S220 (240J+)220 (240J+)
AS-1SAS-1S2,200 2,200 (1,900 )(1,900 )
AS-2SAS-2S˂50U (˂50U)˂50U (˂50U)BG-1SBG-1S˂50U (˂50U)˂50U (˂50U)
BG-2SBG-2S˂50U (˂50U)˂50U (˂50U)
BG-3SBG-3S˂50U (˂50U)˂50U (˂50U)
C-2SC-2S170 (170J+)170 (170J+)
GWA-10SGWA-10S170 (170 )170 (170 )
GWA-1SGWA-1S50UJ (˂50U)50UJ (˂50U)
GWA-20SGWA-20S˂50U (30J+)˂50U (30J+)GWA-22SGWA-22S˂50U (˂50U)˂50U (˂50U)
GWA-23SGWA-23S˂50U (˂50U)˂50U (˂50U)
GWA-2SGWA-2S460 (440 )460 (440 )
GWA-3SAGWA-3SA50UJ (˂50U)50UJ (˂50U)
GWA-4SGWA-4S50UJ (˂50U)50UJ (˂50U)
GWA-5SGWA-5S˂50U (˂50U)˂50U (˂50U)
GWA-6SGWA-6S˂50U (34J+)˂50U (34J+)
GWA-7SGWA-7S˂50U (˂50U)˂50U (˂50U)
GWA-8SGWA-8S240 (240 )240 (240 )
GWA-9SGWA-9S200 (210 )200 (210 )
MW-10MW-10180 (170 )180 (170 )
MW-11SRMW-11SR360 (340 )360 (340 )
MW-13MW-1360 (66 )60 (66 )
MW-14MW-14130 (110 )130 (110 )
MW-15MW-15280 (260 )280 (260 )
MW-1SMW-1S300 (310 )300 (310 )
MW-3SMW-3S260 (260 )260 (260 )
MW-5SMW-5S330 (320 )330 (320 )
MW-6SMW-6S230 (240 )230 (240 )
MW-8IMW-8I˂50U (˂50U)˂50U (˂50U)MW-8SMW-8S˂50U (˂50U)˂50U (˂50U)
MW-9MW-936J (37J)36J (37J)
BORON ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-125
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR BORON IS 700 µg/LNON DETECT CONTOUR CONCENTRATION IS 50 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
100100
5050
1 0 0
1 0 0
100
100
11
00
0
0
5 0 5 0
5050
5050
5
0
5
0
44
00
00
44
00
00
S R -2 0 7 4
S R -1 9 1 2
AB-1DAB-1D65 (67 )65 (67 )
AB-2DAB-2D160 (200 )160 (200 )
AB-3DAB-3D˂50U (˂50U)˂50U (˂50U)
AB-4DAB-4D˂50U (26J)˂50U (26J)
AB-5DAB-5D150 (170J+)150 (170J+)
AB-7DAB-7D50UJ (36J)50UJ (36J)
AB-8DAB-8D440 (470 )440 (470 )
AS-1DAS-1D˂50U (˂50U)˂50U (˂50U)
AS-2DAS-2D28J (˂50U)28J (˂50U)
AS-3DAS-3D27J (˂50U)27J (˂50U)BG-1DBG-1D27J (49J)27J (49J)
BG-2DBG-2D50UJ (˂50U)50UJ (˂50U)
BG-3DBG-3D˂50U (˂50U)˂50U (˂50U)
C-2DC-2D˂50U (˂50U)˂50U (˂50U)
GWA-10DGWA-10D140 (110 )140 (110 )GWA-1DGWA-1D33J (31J)33J (31J)
GWA-20DGWA-20D˂50U (˂50U)˂50U (˂50U)GWA-22DGWA-22D˂50U (˂50U)˂50U (˂50U)
GWA-23DGWA-23D˂50U (37J)˂50U (37J)
GWA-3DGWA-3D34J (34J)34J (34J)
GWA-4DGWA-4D50UJ (˂50U)50UJ (˂50U)
GWA-5DGWA-5D˂50U (31J+)˂50U (31J+)
GWA-6DGWA-6D˂50U (˂50U)˂50U (˂50U)
GWA-7DGWA-7D˂50U (˂50U)˂50U (˂50U)
GWA-8DGWA-8D110 (120 )110 (120 )
GWA-9DGWA-9D260J+ (260 )260J+ (260 )
MW-11DRMW-11DR320 (320 )320 (320 )
MW-15DMW-15D170 (190 )170 (190 )
MW-1DMW-1D650 (650 )650 (650 )
MW-2DMW-2D˂50U (˂50U)˂50U (˂50U)
MW-3DMW-3D260 (270 )260 (270 )
MW-4DMW-4D270 (290 )270 (290 )
MW-5DMW-5D380 (400 )380 (400 )
MW-6DMW-6D320 (340 )320 (340 )
MW-8DMW-8D50UJ (˂50U)50UJ (˂50U)
MW-9DMW-9D50UJ (˂50U)50UJ (˂50U)
BORON ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
ISOCONCENTRATION CONTOUR
DATE
FIGURE
AUGUST 2015
10-126
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR BORON IS 700 µg/LNON DETECT CONTOUR CONCENTRATION IS 50 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
&<
4 0 0 4 0 0
1 0 0 1 0 0
1 0 0
1 0 0
1 0 0
1 0 0
110000
5 5 0 0
5 5 0 0
5500
5
0
5
0
S R -2 0 7 4
S R -1 9 1 2
AB-3BRAB-3BR˂50U (˂50U)˂50U (˂50U)
AB-6BRUAB-6BRU480 (460 )480 (460 )
BG-2BRBG-2BR˂50U (˂50U)˂50U (˂50U)
GWA-20BRGWA-20BR˂50U (˂50U)˂50U (˂50U)GWA-22BRGWA-22BR˂50U (˂50U)˂50U (˂50U)
GWA-23BRGWA-23BR˂50U (˂50U)˂50U (˂50U)
GWA-2BRGWA-2BR˂50U (˂50U)˂50U (˂50U)
GWA-2BRUGWA-2BRU˂50U (50 )˂50U (50 )
GWA-4BRGWA-4BR˂50U (˂50U)˂50U (˂50U)
GWA-7BRGWA-7BR˂50U (˂50U)˂50U (˂50U)
GWA-9BRGWA-9BR210210
MW-15BRMW-15BR260 (240 )260 (240 )
MW-7BRMW-7BR˂50U (˂50U)˂50U (˂50U)
MW-9BRMW-9BR˂50U (˂50U)˂50U (˂50U)
BORON ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-127
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR BORON IS 700 µg/LNON DETECT CONTOUR CONCENTRATION IS 50 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
1 1
1 1
11
1 1
1 1
11
11
11
11
1
1
11
1
1
1
0
1
0
1
0
1
0
0 .50 .5
0 0 ..5 5
0 .50.5
0.50.5
0
.
5
0
.
5
0.50.5
0
.
5
0
.
5
S R -2 0 7 4
S R -1 9 1 2
AB-1SAB-1S1.8J+ (0.48J)1.8J+ (0.48J)
AB-2SAB-2S2.5J+ (0.3J+)2.5J+ (0.3J+)
AB-6SAB-6S1.2J+ (0.78J+)1.2J+ (0.78J+)
AB-7IAB-7I0.9J+ (1.1J+)0.9J+ (1.1J+)
AB-8SAB-8S3.8 (3.1 )3.8 (3.1 )
AS-1SAS-1S6.1 (0.66J+)6.1 (0.66J+)
AS-2SAS-2S44.8 44.8 (10.2 )(10.2 )
BG-1SBG-1S5.2 (0.43J+)5.2 (0.43J+)
BG-2SBG-2S0.83 (0.41J)0.83 (0.41J)
BG-3SBG-3S0.25J+ (0.33J+)0.25J+ (0.33J+)
C-2SC-2S0.64J+ (0.51J+)0.64J+ (0.51J+)
GWA-10SGWA-10S3.5J (1J)3.5J (1J)
GWA-1SGWA-1S11.6 11.6 (1.1J) (1.1J)
GWA-20SGWA-20S133 133 (0.38J+) (0.38J+)GWA-22SGWA-22S1.9J+ (0.77J+)1.9J+ (0.77J+)
GWA-23SGWA-23S3.2J+ (0.54J+)3.2J+ (0.54J+)
GWA-2SGWA-2S2.8J+ (1J+)2.8J+ (1J+)
GWA-3SAGWA-3SA0.53J+ (0.55J+)0.53J+ (0.55J+)
GWA-4SGWA-4S2.1 (2.2 )2.1 (2.2 )
GWA-5SGWA-5S0.57J+ (0.32J+)0.57J+ (0.32J+)
GWA-6SGWA-6S1.7J+ (0.52J+)1.7J+ (0.52J+)
GWA-7SGWA-7S3.8 (2.3J+)3.8 (2.3J+)
GWA-8SGWA-8S6.4J+ (1.5J+)6.4J+ (1.5J+)
GWA-9SGWA-9S0.32J+ (0.36J+)0.32J+ (0.36J+)
MW-10MW-102.7 (2.1J+)2.7 (2.1J+)
MW-11SRMW-11SR1.8J (1.9J)1.8J (1.9J)
MW-13MW-130.38J+ (0.4J+)0.38J+ (0.4J+)
MW-14MW-141.7J+ (1.3J+)1.7J+ (1.3J+)
MW-15MW-156.8 (4.9 )6.8 (4.9 )
MW-1SMW-1S0.57J+ (0.5UJ)0.57J+ (0.5UJ)
MW-3SMW-3S0.44J+ (0.41J+)0.44J+ (0.41J+)
MW-5SMW-5S1.7 (1.6 )1.7 (1.6 )
MW-6SMW-6S0.5UJ (0.36J+)0.5UJ (0.36J+)
MW-8IMW-8I1.3J+ (0.71J+)1.3J+ (0.71J+)MW-8SMW-8S0.71J+ (0.42J+)0.71J+ (0.42J+)
MW-9MW-91.2 (1J+)1.2 (1J+)
CHROMIUM ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-128
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR CHROMIUM IS 10 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
1
0
0
1
0
0
1 0 1 0
1 010
1 01 0
1 0 1 0
1 0 1 0
1 0 1 0
1 0 1 0
1010
1010
1010
0 .50 .5
0 0 ..5 5
0 .5 0 .5
00..55
0
.
5
0
.
5
0.50.5
0
0
.
.
5
5
S R -2 0 7 4
S R -1 9 1 2
AABB--11DD4499..22 ((2211..22 ))
AABB--22DD1133((1122..11 ))
AABB--33DD5511((4455..33 ))
AB-4DAB-4D7.4 (6.4 )7.4 (6.4 )
AB-5DAB-5D5.3 (3.9 )5.3 (3.9 )
AABB--77DD2244..77 ((2266..44 ))
AB-8DAB-8D1.4 (0.43J)1.4 (0.43J)
AS-1DAS-1D903 903 (830 )(830 )
AS-2DAS-2D22.5 22.5 (20.7 )(20.7 )
AS-3DAS-3D23.5 23.5 (20.9 )(20.9 )BBGG--11DD3322..33 ((2288..77 ))
BBGG--22DD5577..55 ((5555..99 ))
BG-3DBG-3D0.97J+ (0.86J+)0.97J+ (0.86J+)
C-2DC-2D2.5J+ (2.7J+)2.5J+ (2.7J+)
GWA-10DGWA-10D6.1 (7.9 )6.1 (7.9 )
GWA-1DGWA-1D6.1 (2.9J)6.1 (2.9J)
GWA-20DGWA-20D186 186 (144 )(144 )
GWA-22DGWA-22D174 174 (171 )(171 )
GWA-23DGWA-23D55 55 (53.6 )(53.6 )
GWA-3DGWA-3D1.1 (0.86 )1.1 (0.86 )
GWA-4DGWA-4D2.1 (0.6 )2.1 (0.6 )
GGWWAA--55DD2244..55 ((1111..99 ))
GGWWAA--66DD2244..88 ((2211 ))
GWA-7DGWA-7D3.3 (2.1 )3.3 (2.1 )
GWA-8DGWA-8D4.2J+ (2.5J+)4.2J+ (2.5J+)
GWA-9DGWA-9D0.39J+ (0.4J+)0.39J+ (0.4J+)
MW-11DRMW-11DR2.5J2.5J
MW-15DMW-15D3.5 (3.5 )3.5 (3.5 )
MW-1DMW-1D0.8J+ (0.66J+)0.8J+ (0.66J+)
MW-2DMW-2D3.6J+ (2.3J+)3.6J+ (2.3J+)
MW-3DMW-3D1.7J+ (1.8J+)1.7J+ (1.8J+)
MW-4DMW-4D1.4J+ (1.3J+)1.4J+ (1.3J+)
MW-5DMW-5D2.7J+ (2.4J+)2.7J+ (2.4J+)
MW-6DMW-6D1.9J+ (1.1J+)1.9J+ (1.1J+)
MW-8DMW-8D4.1 (0.77J+)4.1 (0.77J+)
MW-9DMW-9D27 27 (26.3 )(26.3 )
CHROMIUM ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-129
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR CHROMIUM IS 10 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
&<
1 1
1 1
1 1
1 1
1 1
11
11
1
1
11
1
1
1 010
1 1 0 0
1 0 1 0
1 010
1 1 0 0
1 01 0
1010
1
0
1
0
1010
1100
11
00
0 .50 .5
0 .50 .5
0 .5 0 .5
0 .50.5
0.50.5
00..55
S R -2 0 7 4
S R -1 9 1 2
AB-3BRAB-3BR8.27 (1.99 )8.27 (1.99 )
AB-6BRUAB-6BRU8.1 (3.1J)8.1 (3.1J)
BG-2BRBG-2BR2.3 (0.52J+)2.3 (0.52J+)
GWA-20BRGWA-20BR16.7 16.7 (3.85 ) (3.85 )GWA-22BRGWA-22BR108 108 (49.5 )(49.5 )
GWA-23BRGWA-23BR15.6 15.6 (13.4 )(13.4 )
GWA-2BRGWA-2BR7.4 (3.4 )7.4 (3.4 )
GWA-2BRUGWA-2BRU46 46 (22.9 )(22.9 )
GWA-4BRGWA-4BR38.1 38.1 (29.4 )(29.4 )
GWA-7BRGWA-7BR5.8 (7.8 )5.8 (7.8 )
GWA-9BRGWA-9BR40.640.6
MW-15BRMW-15BR4.9 (4.2 )4.9 (4.2 )
MMWW--77BBRR2244..77 ((2233..33 ))
MW-9BRMW-9BR4J (5 )4J (5 )
CHROMIUM ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-130
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR CHROMIUM IS 10 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
1010
1010
1010
1 0 1 0
1
0
1
0
1 0 1 0
11
11
1 1
1 1
1 1
11
11
11
1
1
11
11
11
0 .50.5
0 .5 0 .5
0 .5 0 .5
0.50.5
0
.
5
0
.
5
0.50.5
0
0
.
.
5
5
S R -2 0 7 4
S R -1 9 1 2
AABB--11SS1155..99 ((1166..22 ))
AABB--22SS1177..11 ((1155..99 ))
AB-6SAB-6S0.31J (˂0.5U)0.31J (˂0.5U)
AABB--77II11..66 ((11..55 ))
AB-8SAB-8S0.55 (0.56 )0.55 (0.56 )
AS-1SAS-1S5.4 5.4 (5.3 )(5.3 )
AS-2SAS-2S12.4 12.4 (10.1 )(10.1 )BBGG--11SS33((11..99 ))
BG-2SBG-2S0.69 (0.69 )0.69 (0.69 )
BG-3SBG-3S0.54 (0.54 )0.54 (0.54 )
C-2SC-2S39.7 39.7 (42.5 )(42.5 )
GWA-10SGWA-10S10 10 (10.3 )(10.3 )
GWA-1SGWA-1S2.1 2.1 (0.23J) (0.23J)
GWA-20SGWA-20S12.7 12.7 (3 )(3 )GWA-22SGWA-22S1.3 1.3 (1.2 )(1.2 )
GWA-23SGWA-23S3.3 3.3 (3.1 )(3.1 )
GWA-2SGWA-2S0.34J (˂0.5U)0.34J (˂0.5U)
GWA-3SAGWA-3SA18.4 18.4 (19.8 )(19.8 )
GWA-4SGWA-4S1.7 1.7 (1.4 )(1.4 )
GGWWAA--55SS44..55 ((44..66 ))
GGWWAA--66SS2277..66 ((2255..33 ))
GWA-7SGWA-7S1J+ (0.31J+)1J+ (0.31J+)
GGWWAA--88SS6666..88 ((22 ))
GGWWAA--99SS5500..11 ((5511 ))
MW-10MW-100.9 (0.72 )0.9 (0.72 )
MW-11SRMW-11SR˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MMWW--11332233..77 ((2244..33 ))
MW-14MW-14˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-15MW-151.3 1.3 (0.58 ) (0.58 )
MMWW--11SS6611((6600..77 ))
MW-3SMW-3S0.14J (˂0.5U)0.14J (˂0.5U)
MMWW--55SS11..99 ((22..22 ))
MW-6SMW-6S0.2J (0.21J)0.2J (0.21J)
MW-8IMW-8I0.76 (0.5UJ)0.76 (0.5UJ)MW-8SMW-8S0.23J (0.2J)0.23J (0.2J)
MW-9MW-90.87 (0.67 )0.87 (0.67 )
COBALT ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
IMAC CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-131
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR COBALT IS 1 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
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11
1
1
1 1
11
0 .5 0 .5
0
.
5
0
.
5
0.50.5
0
.
5
0
.
5
0
.
5
0
.
5
0 .5
0 .5
0 .50.5
S R -2 0 7 4
S R -1 9 1 2
AABB--11DD22..99 ((˂˂00..55UU))
AB-2DAB-2D0.15J (˂0.5U)0.15J (˂0.5U)
AB-3DAB-3D0.18J (˂0.5U)0.18J (˂0.5U)
AB-4DAB-4D0.18J (˂0.5U)0.18J (˂0.5U)
AB-5DAB-5D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
AB-7DAB-7D˂0.5U (0.5UJ)˂0.5U (0.5UJ)
AB-8DAB-8D0.73 (0.61 )0.73 (0.61 )
AS-1DAS-1D0.18J (˂0.5U)0.18J (˂0.5U)
AS-2DAS-2D0.2J (˂0.5U)0.2J (˂0.5U)
AS-3DAS-3D0.16J (˂0.5U)0.16J (˂0.5U)BBGG--11DD11..33 ((11..33 ))
BG-2DBG-2D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
BG-3DBG-3D0.84 (0.14J)0.84 (0.14J)
C-2DC-2D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-10DGWA-10D0.19J (˂0.5U)0.19J (˂0.5U)
GWA-1DGWA-1D0.55 (˂0.5U)0.55 (˂0.5U)
GGWWAA--2200DD11..99 ((˂˂00..55UU))GWA-22DGWA-22D3.4 3.4 (˂0.5U) (˂0.5U)
GWA-23DGWA-23D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-3DGWA-3D1.1 1.1 (1.2 )(1.2 )
GWA-4DGWA-4D0.52 (0.52 )0.52 (0.52 )
GWA-5DGWA-5D0.21J (˂0.5U)0.21J (˂0.5U)
GWA-6DGWA-6D0.3J+ (˂0.5U)0.3J+ (˂0.5U)
GWA-7DGWA-7D0.63 (˂0.5U)0.63 (˂0.5U)
GWA-8DGWA-8D0.7 (0.16J)0.7 (0.16J)
GWA-9DGWA-9D0.58 (0.47J+)0.58 (0.47J+)
MW-11DRMW-11DR0.5UJ0.5UJ
MW-15DMW-15D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-1DMW-1D0.51 (0.25J)0.51 (0.25J)
MW-2DMW-2D0.14J (˂0.5U)0.14J (˂0.5U)
MW-3DMW-3D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-4DMW-4D0.67 (0.57 )0.67 (0.57 )
MW-5DMW-5D0.24J (˂0.5U)0.24J (˂0.5U)
MW-6DMW-6D˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-8DMW-8D1.1 1.1 (0.5UJ) (0.5UJ)
MW-9DMW-9D˂0.5U (0.5UJ)˂0.5U (0.5UJ)
COBALT ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
IMAC CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-132
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR COBALT IS 1 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
&<
11
11
0 .50.5
0 .50.5
S R -2 0 7 4
S R -1 9 1 2
AABB--33BBRR11..6644 ((˂˂11UU))
AB-6BRUAB-6BRU1.8 1.8 (˂0.5U) (˂0.5U)
BG-2BRBG-2BR0.82 (0.17J)0.82 (0.17J)
GWA-20BRGWA-20BR˂1U (˂1U)˂1U (˂1U)
GWA-22BRGWA-22BR˂1U (˂1U)˂1U (˂1U)
GWA-23BRGWA-23BR˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-2BRGWA-2BR˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-2BRUGWA-2BRU0.81 (0.5 )0.81 (0.5 )
GWA-4BRGWA-4BR˂1U (˂1U)˂1U (˂1U)
GWA-7BRGWA-7BR˂0.5U (˂0.5U)˂0.5U (˂0.5U)
GWA-9BRGWA-9BR0.750.75
MW-15BRMW-15BR˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-7BRMW-7BR˂0.5U (˂0.5U)˂0.5U (˂0.5U)
MW-9BRMW-9BR˂0.5U (˂0.5U)˂0.5U (˂0.5U)
COBALT ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
IMAC CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-133
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR COBALT IS 1 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
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&<
&<
&<
&<
&<
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1,000
1,000
1 0 ,0 0 010,0 0 0
1 ,0 0 0
1 ,0 0 0
1 ,0 0 0
1 ,0 0 0
1 ,0 0 01,0 0 0
1
,
0
0
0
1
,
0
0
0
1
,
0
0
0
1
,
0
0
0
1 ,0 0 0
1 ,0 0 0
1 1 0 0 ,,0 0 0 0 0 0
300
300
3 0 0300
3
3
0
0
0
0
3
0
0
3
0
0
300
300
3
0
0
3
0
0
33 00 00
3 3 0 0 00
300300 3 0 0300
3 0 030 0
300300
3 0 0 3 0 0
3 0 0 3 0 0
5050
5050
5
0
5
0
5 050
5050
5 050
5 0 5 0
5 0 5 0
S R -2 0 7 4
S R -1 9 1 2
AABB--11SS551100((˂˂5500UU))
AABB--22SS11,,770000 ((˂˂5500UU))
AB-6SAB-6S730 730 (˂50U) (˂50U)
AABB--77II338800((˂˂5500UU))
AB-8SAB-8S160 (˂50U)160 (˂50U)
AS-1SAS-1S660 660 (˂50U) (˂50U)
AS-2SAS-2S2,090 2,090 (314 )(314 )BBGG--11SS22,,220000 ((˂˂5500UU))
BG-2SBG-2S28J (˂50U)28J (˂50U)
BG-3SBG-3S50UJ (˂50U)50UJ (˂50U)
C-2SC-2S140J+ (˂50U)140J+ (˂50U)
GWA-10SGWA-10S87 (32J)87 (32J)
GWA-1SGWA-1S1,800 1,800 (˂50U) (˂50U)
GWA-20SGWA-20S9,500 9,500 (34J) (34J)GWA-22SGWA-22S94 (˂50U)94 (˂50U)
GWA-23SGWA-23S530 530 (˂50U) (˂50U)
GWA-2SGWA-2S590 590 (˂50U) (˂50U)
GWA-3SAGWA-3SA420 420 (190 ) (190 )
GWA-4SGWA-4S220 (˂50U)220 (˂50U)
GWA-5SGWA-5S44J+ (˂50U)44J+ (˂50U)
GGWWAA--66SS11,,110000 ((˂˂5500UU))
GGWWAA--77SS779900((˂˂5500UU))
GWA-8SGWA-8S58 (˂50U)58 (˂50U)
GWA-9SGWA-9S170J+ (26J)170J+ (26J)
MW-10MW-10220 (˂50U)220 (˂50U)
MW-11SRMW-11SR46J (33J)46J (33J)
MMWW--11331155,,770000 ((1155,,000000 ))
MW-14MW-1428J+ (˂50U)28J+ (˂50U)
MW-15MW-15160 (˂50U)160 (˂50U)
MMWW--11SS3300,,880000 ((3300,,660000 ))
MW-3SMW-3S140J+ (˂50U)140J+ (˂50U)
MW-5SMW-5S˂50U (˂50U)˂50U (˂50U)
MW-6SMW-6S250J+ (71J+)250J+ (71J+)
MMWW--88II22,,110000 ((˂˂5500UU))MW-8SMW-8S85J+ (˂50U)85J+ (˂50U)
MW-9MW-9220 (˂50U)220 (˂50U)
IRON ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-134
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR IRON IS 300 µg/LNON DETECT CONTOUR CONCENTRATION IS 50 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
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&<
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11,,0000 00
11
00
00
110000
110000
1 1 0 0 0 0
1 0 010 0
1 0 010 0
1 0 010 0110000
1 0 0
1 0 0
1 1 0 0 0 0
1 0 0 1 0 0
1
1
,
,000000
3 3 0 0 0 0
300300
300
300
3 3 0 0 0 0
3 0 030 0
3300 0 0
3300 0 0
3 3 00 00
5050
5050
5500
5050
5 050
5 05 0
5 050
5 0 5 0
5 05 0
S R -2 0 7 4
S R -1 9 1 2
AABB--11DD337700((˂˂5500UU))
AB-2DAB-2D130 (˂50U)130 (˂50U)
AB-3DAB-3D270 (˂50U)270 (˂50U)
AB-4DAB-4D130 (˂50U)130 (˂50U)
AB-5DAB-5D56 (˂50U)56 (˂50U)
AB-7DAB-7D94J+ (˂50U)94J+ (˂50U)
AB-8DAB-8D300 (60 )300 (60 )
AS-1DAS-1D107 (100 )107 (100 )
AS-2DAS-2D221 (˂50U)221 (˂50U)
AS-3DAS-3D279 (˂50U)279 (˂50U)BBGG--11DD11,,550000 ((˂˂5500UU))
BG-2DBG-2D˂50U (˂50U)˂50U (˂50U)
BBGG--33DD993300((˂˂5500UU))
C-2DC-2D56J+ (˂50U)56J+ (˂50U)
GWA-10DGWA-10D170 (˂50U)170 (˂50U)GWA-1DGWA-1D720 720 (˂50U) (˂50U)
GWA-20DGWA-20D660 660 (˂50U) (˂50U)GWA-22DGWA-22D2,600 2,600 (˂50U) (˂50U)
GWA-23DGWA-23D33J (˂50U)33J (˂50U)
GWA-3DGWA-3D˂50U (˂50U)˂50U (˂50U)
GWA-4DGWA-4D62 (˂50U)62 (˂50U)
GWA-5DGWA-5D86 (˂50U)86 (˂50U)
GWA-6DGWA-6D290J+ (˂50U)290J+ (˂50U)
GGWWAA--77DD444400((˂˂5500UU))
GGWWAA--88DD11,,330000 ((˂˂5500UU))
GWA-9DGWA-9D270 (80 )270 (80 )
MW-11DRMW-11DR62 (˂50U)62 (˂50U)
MW-15DMW-15D75J+ (˂50U)75J+ (˂50U)
MW-1DMW-1D74J+ (˂50U)74J+ (˂50U)
MW-2DMW-2D72J+ (˂50U)72J+ (˂50U)
MW-3DMW-3D44J+ (˂50U)44J+ (˂50U)
MW-4DMW-4D230J+ (˂50U)230J+ (˂50U)
MW-5DMW-5D200J+ (˂50U)200J+ (˂50U)
MW-6DMW-6D93J+ (˂50U)93J+ (˂50U)
MW-8DMW-8D2,700 2,700 (˂50U) (˂50U)
MW-9DMW-9D180 (88 )180 (88 )
IRON ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-135
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR IRON IS 300 µg/LNON DETECT CONTOUR CONCENTRATION IS 50 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
&<
1
0
0
1
0
0
1 ,0 0 01,0 0 0
1
0
0
1
0
0
1 0 0100
1 0 010 0
11 00 00
1 0 01 0 0
1 1 0 0 0 0
1 0 01 0 0
1 0 0 1 0 0
1 0 0 1 0 0
3
0
0
3
0
0
3 0 0300
3 0 0300
3 3 0 0 0 0
3 3 00 00
300300
55
00
5 050
5 0 5 0
5050
5 0 5 0
5 0 5 0
5 0 5 0
S R -2 0 7 4
S R -1 9 1 2
AABB--33BBRR44,,444400 ((3333 ))
AB-6BRUAB-6BRU970 970 (52 ) (52 )
BG-2BRBG-2BR760J760J (˂50U) (˂50U)
GWA-20BRGWA-20BR143 (˂10U)143 (˂10U)
GWA-22BRGWA-22BR61 (˂10U)61 (˂10U)
GWA-23BRGWA-23BR140 (˂50U)140 (˂50U)
GWA-2BRGWA-2BR64 (˂50U)64 (˂50U)
GWA-2BRUGWA-2BRU1,500 1,500 (50 ) (50 )
GWA-4BRGWA-4BR87 (˂10U)87 (˂10U)
GWA-7BRGWA-7BR77 (˂50U)77 (˂50U)
GWA-9BRGWA-9BR450450
MW-15BRMW-15BR54 (˂50U)54 (˂50U)
MW-7BRMW-7BR˂50U (˂50U)˂50U (˂50U)
MW-9BRMW-9BR180 (˂50U)180 (˂50U)
IRON ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-136
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR IRON IS 300 µg/LNON DETECT CONTOUR CONCENTRATION IS 50 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
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&<
&<
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100100
1 0 0
1 0 0
1,000
1,000
1 ,0 0 01,0 0 0
100100
1 0 0100
1 0 0
1 0 0
100100
11 00 00
1
0
0
1
0
0
1 0 0100
1
1
0
0
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55 00 00
1 1 ,,00 0000
1 1 ,,000000
1
1
0
0
0
0
1
,
0
0
0
1
,
0
0
0
5
0
5
0
5
0
5
0
5 0 5 0
5 0 5 0
5050 5 050
5 050
5 0 5 0
5 05 0
5 05 0
55
00
5
0
5
0
5
5
0
0
5500
5
0
5
0
5050
55
5 5
5 5 55
55
55
S R -2 0 7 4
S R -1 9 1 2
AABB--11SS225500((226600 ))
AABB--22SS333300((331100 ))
AB-6SAB-6S12 (˂5U)12 (˂5U)
AABB--77II8855((7777 ))
AB-8SAB-8S150 150 (140 )(140 )
AS-1SAS-1S1,900 1,900 (1,700 )(1,700 )
AS-2SAS-2S640 640 (580 )(580 )BBGG--11SS330000((224400 ))
BG-2SBG-2S370 370 (360 )(360 )
BBGG--33SS224400((224400 ))
C-2SC-2S600 600 (580 )(580 )
GWA-10SGWA-10S250 250 (240 )(240 )
GWA-1SGWA-1S110 110 (30 ) (30 )
GGWWAA--2200SS332200((115500 ))GWA-22SGWA-22S48 (44 )48 (44 )
GGWWAA--2233SS8822((8811 ))
GWA-2SGWA-2S95 95 (56 )(56 )
GWA-3SAGWA-3SA12,700 12,700 (13,600 )(13,600 )
GWA-4SGWA-4S120 120 (92 )(92 )
GGWWAA--55SS119900((220000 ))
GWA-6SGWA-6S1,300 1,300 (1,100 )(1,100 )
GWA-7SGWA-7S30 (16 )30 (16 )
GGWWAA--88SS772200((776600 ))
GWA-9SGWA-9S2,900 2,900 (3,000 )(3,000 )
MW-10MW-1036 (30 )36 (30 )
MW-11SRMW-11SR32 (29 )32 (29 )
MW-13MW-138,300 8,300 (8,700 )(8,700 )
MW-14MW-144J (3.1J)4J (3.1J)
MW-15MW-1533 (26 )33 (26 )
MMWW--11SS22,,660000 ((22,,660000 ))
MMWW--33SS6688((5533 ))
MW-5SMW-5S39 (49 )39 (49 )
MW-6SMW-6S44 (43 )44 (43 )
MW-8IMW-8I39 (2.8J)39 (2.8J)MW-8SMW-8S57 57 (54 )(54 )
MW-9MW-97 (4.6J)7 (4.6J)
MANGANESE ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-137
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR MANGANESE IS 50 µg/LNON DETECT CONTOUR CONCENTRATION IS 5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
1
0
1
0
1 0 1 0
1 0 1 0
1
0
1
0
1100
1 010
1010
1010
1 0 1 0
1 01 0
5 0 5 0
5 0 5 0
5
0
5
0
5 5 0 0
5 050
5050
5050
5 5
5 5
55
55
55
55
5 5
55
5 5
5 5
S R -2 0 7 4
S R -1 9 1 2
AB-1DAB-1D10 (˂5U)10 (˂5U)
AB-2DAB-2D5.6 (˂5U)5.6 (˂5U)
AB-3DAB-3D6.7 (˂5U)6.7 (˂5U)
AB-4DAB-4D4.1J (˂5U)4.1J (˂5U)
AB-5DAB-5D˂5U (˂5U)˂5U (˂5U)
AB-7DAB-7D4.6J (˂5U)4.6J (˂5U)
AB-8DAB-8D140 140 (130 )(130 )
AS-1DAS-1D3.7J (˂5U)3.7J (˂5U)
AS-2DAS-2D8.2 (˂5U)8.2 (˂5U)
AS-3DAS-3D12 (˂5U)12 (˂5U)
BG-1DBG-1D27 (˂5U)27 (˂5U)
BG-2DBG-2D˂5U (˂5U)˂5U (˂5U)
BBGG--33DD6633((1144 ))
C-2DC-2D9.1 (7 )9.1 (7 )
GWA-10DGWA-10D10 (˂5U)10 (˂5U)
GWA-1DGWA-1D28 (˂5U)28 (˂5U)
GWA-20DGWA-20D15 (˂5U)15 (˂5U)GWA-22DGWA-22D120 120 (˂5U) (˂5U)
GWA-23DGWA-23D˂5U (˂5U)˂5U (˂5U)
GWA-3DGWA-3D9,200 9,200 (11,600 )(11,600 )
GWA-4DGWA-4D28 (27 )28 (27 )
GWA-5DGWA-5D˂5U (˂5U)˂5U (˂5U)
GWA-6DGWA-6D6.8 (˂5U)6.8 (˂5U)
GWA-7DGWA-7D28 (˂5U)28 (˂5U)
GGWWAA--88DD9966((6699 ))
GGWWAA--99DD9900((8833 ))
MW-11DRMW-11DR9.1 (6.3 )9.1 (6.3 )
MW-15DMW-15D3.3J+ (˂5U)3.3J+ (˂5U)
MW-1DMW-1D530 530 (430 )(430 )
MW-2DMW-2D8.3 (7.7 )8.3 (7.7 )
MW-3DMW-3D˂5U (˂5U)˂5U (˂5U)
MW-4DMW-4D24J+ (22J+)24J+ (22J+)
MW-5DMW-5D8.1J+ (3J+)8.1J+ (3J+)
MW-6DMW-6D8.4J+ (7.2J+)8.4J+ (7.2J+)
MW-8DMW-8D40 (3.5J)40 (3.5J)
MW-9DMW-9D8.1 (4.6J)8.1 (4.6J)
MANGANESE ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-138
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR MANGANESE IS 50 µg/LNON DETECT CONTOUR CONCENTRATION IS 5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
&<
1
0
1
0
1 010
11 0 0
1 01 0
1100
5 05 0
5 0 5 0
5 5
5 5
55
55
55
S R -2 0 7 4
S R -1 9 1 2
AABB--33BBRR8877((˂˂55UU))
AB-6BRUAB-6BRU25 (2.8J)25 (2.8J)
BG-2BRBG-2BR28J (˂5U)28J (˂5U)
GWA-20BRGWA-20BR˂5U (˂5U)˂5U (˂5U)GWA-22BRGWA-22BR˂5U (˂5U)˂5U (˂5U)
GWA-23BRGWA-23BR4.4J (˂5U)4.4J (˂5U)
GWA-2BRGWA-2BR5UJ (3.5J)5UJ (3.5J)
GWA-2BRUGWA-2BRU61 61 (5 ) (5 )
GWA-4BRGWA-4BR˂5U (˂5U)˂5U (˂5U)
GWA-7BRGWA-7BR4.2J (˂5U)4.2J (˂5U)
GWA-9BRGWA-9BR1313
MW-15BRMW-15BR4.4J (˂5U)4.4J (˂5U)
MW-7BRMW-7BR˂5U (˂5U)˂5U (˂5U)
MW-9BRMW-9BR7.5 (˂5U)7.5 (˂5U)
MANGANESE ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-139
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR MANGANESE IS 50 µg/LNON DETECT CONTOUR CONCENTRATION IS 5 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
1 1 0 0 0 0 ,,0 0 0 0 0 0
1100,,000000
11 00 ,,00 00 00
1 1 0 0 ,,0 0 0 0 0 0
1 1 0 0 ,,0 0 0 0 0 0
1100,,000000
1100,,000000
1
1
0
0
,
,
0
0
0
0
0
0
1 1 00 00 ,,000000
2
2
5
5
00
,,
00
00
00
11 00 00 00
1 1 0 0 0 0 0 0
1 1 0 0 0 0 0 0
1 1 0 0 0 0 0 0
11000000
11
00
00
00
110000
0
0
S R -2 0 7 4
S R -1 9 1 2
AB-1SAB-1S690J690J
AB-2SAB-2S1,000UJ1,000UJ
AB-6SAB-6S15,70015,700
AB-7IAB-7I6,3006,300
AB-8SAB-8S132,000132,000
AS-1SAS-1S231,000231,000
AS-2SAS-2S5,2005,200 BG-1SBG-1S580J580J
BG-2SBG-2S2,9002,900
BG-3SBG-3S2,4002,400
C-2SC-2S60,40060,400
GWA-10SGWA-10S31,00031,000
GWA-1SGWA-1S˂1,000U˂1,000U
GWA-20SGWA-20S980J980J
GWA-22SGWA-22S˂1,000U˂1,000U
GWA-23SGWA-23S˂1,000U˂1,000U
GWA-2SGWA-2S36,10036,100
GWA-3SAGWA-3SA1,420,0001,420,000
GWA-4SGWA-4S84,70084,700
GWA-5SGWA-5S˂1,000U˂1,000U
GWA-6SGWA-6S1,2001,200
GWA-7SGWA-7S530J530J
GWA-8SGWA-8S36,000J+36,000J+
GWA-9SGWA-9S26,50026,500
MW-10MW-1019,50019,500
MW-11SRMW-11SR37,60037,600
MW-13MW-1315,70015,700
MW-14MW-1430,10030,100
MW-15MW-1529,00029,000
MW-1SMW-1S1,200J-1,200J-
MW-3SMW-3S29,90029,900
MW-5SMW-5S10,20010,200
MW-6SMW-6S36,70036,700
MW-8IMW-8I˂1,000U˂1,000U MW-8SMW-8S580J580J
MW-9MW-924,60024,600
SULFATE ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-140
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR SULFATE IS 250000 µg/LNON DETECT CONTOUR CONCENTRATION IS 1000 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
1 1 0 0 0 0 ,,0 0 0 0 0 0
1 0 ,0 0 010,0 0 0
1 0 ,0 0 010,0 0 0
11 00 ,,00 00 00
1 0 ,0 0 010,0 0 0
1 0 ,0 0 010,0 0 0
1 0 ,0 0 0
1 0 ,0 0 0
10,000
10,000
11
00
,,
00
00
00
10,000
10,000
10,000
10,000
1
0
,
0
0
0
1
0
,
0
0
0
1 1 0 0 ,,0 0 0 0 0 0
110000 ,,00 00 0 0
1 1 0 0 0 0 ,,0 0 0 0 0 0
2 2 5 5 0 0 ,,000000
225500 ,,00 0 0 0 0
1 1 00 00 00
1 0 0 0100 0
1 0 0 01000
10001000
1
0
0
0
1
0
0
0
10001000
1
0
0
0
1
0
0
0
S R -2 0 7 4
S R -1 9 1 2
AB-1DAB-1D22,80022,800
AB-2DAB-2D22,70022,700
AB-3DAB-3D144,000144,000
AB-4DAB-4D13,10013,100
AB-5DAB-5D56,30056,300
AB-7DAB-7D46,50046,500
AB-8DAB-8D136,000136,000
AS-1DAS-1D21,30021,300
AS-2DAS-2D26,00026,000
AS-3DAS-3D18,00018,000 BG-1DBG-1D48,400J+48,400J+
BG-2DBG-2D31,10031,100
BG-3DBG-3D1,1001,100
C-2DC-2D1,9001,900
GWA-10DGWA-10D25,90025,900
GWA-1DGWA-1D8,7008,700
GWA-20DGWA-20D376,000J+376,000J+
GWA-22DGWA-22D23,50023,500
GWA-23DGWA-23D10,60010,600
GWA-3DGWA-3D1,310,0001,310,000
GWA-4DGWA-4D4,4004,400
GWA-5DGWA-5D5,0005,000
GWA-6DGWA-6D15,50015,500
GWA-7DGWA-7D32,30032,300
GWA-8DGWA-8D23,800J+23,800J+
GWA-9DGWA-9D33,20033,200
MW-11DRMW-11DR36,00036,000
MW-15DMW-15D40,10040,100
MW-1DMW-1D86,10086,100
MW-2DMW-2D720J720J
MW-3DMW-3D26,70026,700
MW-4DMW-4D30,90030,900
MW-5DMW-5D44,60044,600
MW-6DMW-6D34,60034,600
MW-8DMW-8D˂1,000U˂1,000U
MW-9DMW-9D27,60027,600
SULFATE ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-141
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR SULFATE IS 250000 µg/LNON DETECT CONTOUR CONCENTRATION IS 1000 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
5 5 0 0 ,,0 0 0 0 0 0
2 0 ,0 0 0
2 0 ,0 0 0
2 0 ,0 0 0
2 0 ,0 0 0
2 0 ,0 0 0
2 0 ,0 0 0
22
00,,000000
22
00,,00
00
00
1 1 0 0 ,,0 0 0 0 0 0
1 0 ,0 0 0
1 0 ,0 0 0
1 0 ,0 0 0
1 0 ,0 0 0
10,000
10,000
10,000
10,000
11
00
,,00
00
00
1100,,000000
1 0 0 0
1 0 0 0
1 0 0 01 0 0 0
1 0 0 0
1 0 0 0
10001000
1
0
0
0
1
0
0
0
1000
1000
S R -2 0 7 4
S R -1 9 1 2
AB-3BRAB-3BR17,00017,000
AB-6BRUAB-6BRU87,00087,000
BG-2BRBG-2BR8,2008,200
GWA-20BRGWA-20BR5,8005,800 GWA-22BRGWA-22BR21,00021,000GWA-23BRGWA-23BR18,00018,000
GWA-2BRGWA-2BR39,50039,500
GWA-2BRUGWA-2BRU3,0003,000
GWA-4BRGWA-4BR6,9006,900
GWA-7BRGWA-7BR21,50021,500
MW-15BRMW-15BR39,50039,500
MW-7BRMW-7BR7,2007,200
MW-9BRMW-9BR18,00018,000
SULFATE ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-142
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR SULFATE IS 250000 µg/LNON DETECT CONTOUR CONCENTRATION IS 1000 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
2 2 0 0 0 0 ,,0 0 0 0 0 0220000,,000000
2 2 0 0 0 0 ,,0 0 0 0 0 0
5 5 0 0 ,,0 0 0 0 0 0
5 5 0 0 ,,0 0 0 0 0 0
5 5 0 0 ,,0 0 0 0 0 0
5 5 0 0 ,,000000
50,000
50,000
5500,,000000
5500,,000000
5
5
0
0
,,
0
0
0
0
0
0
550000,,000000
55
0
0
0
0
,,
0
0
0
0
0
0
25000
25000
22
55000000
22 55 00 00 00
2 5 0 0 025000
2 5 0 0 025000
22 55 00 00 0 0
2 2 5 5 0 0 0 0 0 0
2 2 5 5 0 0 0 0 0 0
S R -2 0 7 4
S R -1 9 1 2
AB-1SAB-1S40,00040,000
AB-2SAB-2S30,00030,000
AB-6SAB-6S296,000296,000
AB-7IAB-7I41,00041,000
AB-8SAB-8S274,000274,000
AS-1SAS-1S750,000J-750,000J-
AS-2SAS-2S62,000J-62,000J-BG-1SBG-1S˂25,000U˂25,000U
BG-2SBG-2S87,00087,000
BG-3SBG-3S57,00057,000
C-2SC-2S160,000J+160,000J+
GWA-10SGWA-10S109,000109,000
GWA-1SGWA-1S78,00078,000
GWA-20SGWA-20S31,00031,000 GWA-22SGWA-22S˂25,000U˂25,000U
GWA-23SGWA-23S27,00027,000
GWA-2SGWA-2S132,000132,000
GWA-3SAGWA-3SA23,000,00023,000,000
GWA-4SGWA-4S187,000187,000
GWA-5SGWA-5S˂25,000U˂25,000U
GWA-6SGWA-6S31,000J+31,000J+
GWA-7SGWA-7S65,000J+65,000J+
GWA-8SGWA-8S85,00085,000
GWA-9SGWA-9S60,00060,000
MW-10MW-1069,000J (25,000 )69,000J (25,000 )
MW-11SRMW-11SR˂25,000U˂25,000U
MW-13MW-1387,00087,000
MW-14MW-14138,000138,000
MW-15MW-15227,000227,000
MW-1SMW-1S60,00060,000
MW-3SMW-3S118,000118,000
MW-5SMW-5S58,00058,000
MW-6SMW-6S121,000121,000
MW-8IMW-8I77,00077,000
MW-8SMW-8S˂25,000U˂25,000U
MW-9MW-9114,000114,000
TOTAL DISSOLVED SOLIDS ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-143
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR TOTAL DISSOLVED SOLIDS IS 500000 µg/LNON DETECT CONTOUR CONCENTRATION IS 25000 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
2 2 0 0 0 0 ,,0 0 0 0 0 0
2
2
0
0
00
,,
00
0000
2 2 0 0 0 0 ,,0 0 0 0 0 0
5
5
0
0
,
,
0
0
0
0
0
0
5500,,000000
5 5 0 0 ,,0 0 0 0 0 0
22 00 00 ,,00 00 00
22 00 00 ,,0 0 0 0 0 0
2 2 0 0 0 0 ,,0 0 0 0 0 0
220000,,000000
2 2 0 0 0 0 ,,0 0 0 0 0 0
2 2 0 0 0 0 ,,0 0 0 0 0 0
55
00,,
00
00
00
50,000
50,000
5500,,000000
5 5 0 0 ,,0 0 0 0 0 0
5 0 ,0 0 050,0 0 0
55 00 ,,00 00 00
5 5 0 0 ,,0 0 0 0 0 0
5 5 00 ,,00 00 00
55 00 ,,00 00 00
5 5 0 0 ,,0 0 0 0 0 0
5 5 0 0 ,,0 0 0 0 0 0
55 00 00 ,,0 0 0 0 0 0
5 5 0 0 0 0 ,,0 0 0 0 00
5 5 0 0 0 0 ,,0 0 0 0 0 0
5 5 0 0 0 0 ,,0 0 0 0
0 0
550000,,000000
2
5
0
0
0
2
5
0
0
0
2 2 5 5 0 0 0 0 0 0
2 2 5 5 0 0 0 0 0 0
2500025000
22
55
00
00
00
22
5
5
0
0
0
0
0
0
22
55
0
0
0
0
0
0
2 5 0 0 025000
2500025000
2 2 5 5 0 0 0 0 0 0
22 55 00 00 00
2 5 0 0 0
2 5 0 0 0
2 2 5 5 0 0 0 0 0 0
S R -2 0 7 4
S R -1 9 1 2
AB-1DAB-1D351,000351,000
AB-2DAB-2D241,000241,000
AB-3DAB-3D946,000946,000
AB-4DAB-4D159,000159,000
AB-5DAB-5D214,000214,000
AB-7DAB-7D326,000326,000
AB-8DAB-8D361,000361,000
AS-1DAS-1D390,000J-390,000J-
AS-2DAS-2D280,000J-280,000J-
AS-3DAS-3D110,000J-110,000J-BG-1DBG-1D555,000555,000
BG-2DBG-2D261,000261,000
BG-3DBG-3D231,000231,000
C-2DC-2D152,000J+152,000J+
GWA-10DGWA-10D185,000185,000
GWA-1DGWA-1D232,000232,000
GWA-20DGWA-20D2,900,0002,900,000 GWA-22DGWA-22D214,000214,000
GWA-23DGWA-23D196,000196,000
GWA-3DGWA-3D2,390,0002,390,000
GWA-4DGWA-4D101,000101,000
GWA-5DGWA-5D137,000137,000
GWA-6DGWA-6D184,000J+184,000J+
GWA-7DGWA-7D176,000176,000
GWA-8DGWA-8D128,000128,000
GWA-9DGWA-9D26,00026,000
MW-11DRMW-11DR140,000140,000
MW-15DMW-15D241,000241,000
MW-1DMW-1D197,000197,000
MW-2DMW-2D92,00092,000
MW-3DMW-3D141,000141,000
MW-4DMW-4D113,000113,000
MW-5DMW-5D186,000186,000
MW-6DMW-6D129,000129,000
MW-8DMW-8D111,000111,000
MW-9DMW-9D243,000243,000
TOTAL DISSOLVED SOLIDS ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-144
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR TOTAL DISSOLVED SOLIDS IS 500000 µg/LNON DETECT CONTOUR CONCENTRATION IS 25000 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
2 0 0 ,0 0 0200,0 0 0
220000,,000000
2
2
0
0
00
,,00
0000
220000,,00
00
00
200,000200,000
55 00 ,,00 00 00
5 0 ,0 0 050,0 0 0
55 00 ,,00 00 00
5 5 0 0 ,,0 0 0 0 0 0
55 00,,000000
5 5
0 0 ,,0 0 0 0 0 0
5 5 0 0 ,,0 0 0 0 0 0
5 5 0 0 ,,0 0 0 0 0 0
5 5 0 0 ,,0 0 0 0 0 0
5 0 ,0 0 0
5 0 ,0 0 0
22 0000,,00
00
00
22 00 00 ,,0 0 0 0 0 0
550000,,000000
5 5 0 0 00 ,,000000
5 0 0 ,0 0 0
5 0 0 ,0 0 0
2255
00
00
00
22 55 00 00 00
2 5 0 0 025000
2 2 5 5 0 0 0 0 0 0
2 5 0 0 0
2 5 0 0 0
2 5 0 0 0
2 5 0 0 0
2 5 0 0 0
2 5 0 0 0
S R -2 0 7 4
S R -1 9 1 2
AB-3BRAB-3BR160,000160,000
AB-6BRUAB-6BRU247,000247,000
BG-2BRBG-2BR118,000118,000
GWA-20BRGWA-20BR380,000380,000 GWA-22BRGWA-22BR360,000360,000
GWA-23BRGWA-23BR790,000790,000
GWA-2BRGWA-2BR164,000164,000
GWA-2BRUGWA-2BRU18,100,00018,100,000
GWA-4BRGWA-4BR1,500,0001,500,000
GWA-7BRGWA-7BR141,000141,000
MW-15BRMW-15BR232,000232,000
MW-7BRMW-7BR1,180,0001,180,000
MW-9BRMW-9BR107,000107,000
TOTAL DISSOLVED SOLIDS ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-145
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER NC 2L STANDARD FOR TOTAL DISSOLVED SOLIDS IS 500000 µg/LNON DETECT CONTOUR CONCENTRATION IS 25000 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
0 .10.1
S R -2 0 7 4
S R -1 9 1 2
AB-1SAB-1S˂0.1U (0.018J)˂0.1U (0.018J)
AB-2SAB-2S0.072J (0.052J)0.072J (0.052J)
AB-6SAB-6S(˂0.1U)(˂0.1U)
AB-7IAB-7I0.048J+ (0.042J+)0.048J+ (0.042J+)
AB-8SAB-8S0.02J (˂0.1U)0.02J (˂0.1U)
AS-1SAS-1S0.076J (0.065J)0.076J (0.065J)
AS-2SAS-2S0.11 (0.085J)0.11 (0.085J)BG-1SBG-1S0.032J (0.016J)0.032J (0.016J)
BG-2SBG-2S0.033J+ (0.031J)0.033J+ (0.031J)
BG-3SBG-3S˂0.1U (˂0.1U)˂0.1U (˂0.1U)
C-2SC-2S0.09J (0.095J)0.09J (0.095J)
GWA-10SGWA-10S˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-1SGWA-1S˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-20SGWA-20S0.087J (0.04J)0.087J (0.04J)GWA-22SGWA-22S0.02J (0.02J)0.02J (0.02J)
GWA-23SGWA-23S˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-2SGWA-2S(˂0.1U)(˂0.1U)
GWA-3SAGWA-3SA˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-4SGWA-4S0.1UJ (˂0.1U)0.1UJ (˂0.1U)
GWA-5SGWA-5S˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-6SGWA-6S0.054J (0.041J)0.054J (0.041J)
GWA-7SGWA-7S˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-8SGWA-8S0.031J (˂0.1U)0.031J (˂0.1U)
GWA-9SGWA-9S0.04J (0.041J)0.04J (0.041J)
MW-10MW-10(˂0.1U)(˂0.1U)
MW-11SRMW-11SR˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-13MW-130.072J (0.076J)0.072J (0.076J)
MW-14MW-14˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-15MW-15(˂0.1U)(˂0.1U)
MW-1SMW-1S˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-3SMW-3S˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-5SMW-5S˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-6SMW-6S˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-8IMW-8I0.02J (˂0.1U)0.02J (˂0.1U)MW-8SMW-8S0.033J (˂0.1U)0.033J (˂0.1U)
MW-9MW-9˂0.1U (˂0.1U)˂0.1U (˂0.1U)
THALLIUM ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-146
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR THALLIUM IS 0.2 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.1 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
110.20.2
0 0 ..1 1
S R -2 0 7 4
S R -1 9 1 2
AB-1DAB-1D0.064J (0.097J)0.064J (0.097J)
AB-2DAB-2D0.06J (0.055J)0.06J (0.055J)
AB-3DAB-3D0.025J (0.018J)0.025J (0.018J)
AB-4DAB-4D˂0.1U (0.027J)˂0.1U (0.027J)
AB-5DAB-5D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
AB-7DAB-7D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
AB-8DAB-8D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
AS-1DAS-1D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
AS-2DAS-2D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
AS-3DAS-3D˂0.1U (˂0.1U)˂0.1U (˂0.1U)BG-1DBG-1D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
BG-2DBG-2D0.1UJ (˂0.1U)0.1UJ (˂0.1U)
BG-3DBG-3D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
C-2DC-2D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-10DGWA-10D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-1DGWA-1D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-20DGWA-20D3.2 3.2 (3.1 )(3.1 )GWA-22DGWA-22D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-23DGWA-23D˂0.1U (0.1UJ)˂0.1U (0.1UJ)
GWA-3DGWA-3D˂0.1U (0.016J)˂0.1U (0.016J)
GWA-4DGWA-4D0.1UJ (0.094J)0.1UJ (0.094J)
GWA-5DGWA-5D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-6DGWA-6D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
GWA-7DGWA-7D0.018J (0.032J)0.018J (0.032J)
GWA-8DGWA-8D˂0.1U (0.027J)˂0.1U (0.027J)
GWA-9DGWA-9D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-11DRMW-11DR˂0.1U˂0.1U
MW-15DMW-15D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-1DMW-1D0.034J (0.061J)0.034J (0.061J)
MW-2DMW-2D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-3DMW-3D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-4DMW-4D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-5DMW-5D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-6DMW-6D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-8DMW-8D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
MW-9DMW-9D˂0.1U (˂0.1U)˂0.1U (˂0.1U)
THALLIUM ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
IMAC CONTOUR
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
DATE
FIGURE
AUGUST 2015
10-147
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR THALLIUM IS 0.2 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.1 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
&<
S R -2 0 7 4
S R -1 9 1 2
AB-3BRAB-3BR˂0.2U (˂0.2U)˂0.2U (˂0.2U)
AB-6BRUAB-6BRU˂0.1U (˂0.1U)˂0.1U (˂0.1U)
BG-2BRBG-2BR˂0.1U (0.016J)˂0.1U (0.016J)
GWA-20BRGWA-20BR˂0.2U (˂0.2U)˂0.2U (˂0.2U)
GWA-22BRGWA-22BR˂0.2U (˂0.2U)˂0.2U (˂0.2U)
GWA-23BRGWA-23BR0.077J (0.077J)0.077J (0.077J)
GWA-2BRGWA-2BR˂0.1U (˂0.1U)˂0.1U (˂0.1U)GWA-2BRUGWA-2BRU0.03J (0.025 )0.03J (0.025 )
GWA-4BRGWA-4BR˂0.2U (˂0.2U)˂0.2U (˂0.2U)
GWA-7BRGWA-7BR˂0.1U (0.017J)˂0.1U (0.017J)
GWA-9BRGWA-9BR˂0.1U˂0.1U
MW-15BRMW-15BR(˂0.1U)(˂0.1U)
MW-7BRMW-7BR0.064J+ (0.071J)0.064J+ (0.071J)
MW-9BRMW-9BR0.017J (˂0.1U)0.017J (˂0.1U)
THALLIUM ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
DATE
FIGURE
AUGUST 2015
10-148
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR THALLIUM IS 0.2 µg/LNON DETECT CONTOUR CONCENTRATION IS 0.1 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
3 3
33
33
33
33
0 0 ..
3 3
0.30.3
0
.
3
0
.
3
0.30.3
0 0 ..3 3
0 .3 0 .3
0 .3 0 .3
0 .3 0 .3
0.30.3
00..33
0.30.3
0 0 ..3 3
0 .30.3
0 .30 .3
0 .3 0 .3
0 0 ..3 3
0.30.3
0.30.3
S R -2 0 7 4
S R -1 9 1 2
AABB--11SS11..88 ((˂˂11UU))
AABB--22SS33..88 ((˂˂11UU))
AB-6SAB-6S25.2 25.2 (24.3 )(24.3 )
AB-7IAB-7I˂1U (˂1U)˂1U (˂1U)
AB-8SAB-8S0.79J0.79J (0.37J)(0.37J)
AS-1SAS-1S1.6J+1.6J+ (0.48J+)(0.48J+)
AS-2SAS-2S3.9 3.9 (˂1U) (˂1U)BBGG--11SS55..99 ((˂˂11UU))
BG-2SBG-2S0.35J0.35J (˂1U) (˂1U)
BG-3SBG-3S0.75J+0.75J+ (0.7J+)(0.7J+)
C-2SC-2S0.52J0.52J (˂1U) (˂1U)
GWA-10SGWA-10S0.62J0.62J (0.39J)(0.39J)
GWA-1SGWA-1S7.9 7.9 (0.86J)(0.86J)
GWA-20SGWA-20S23 23 (˂1U) (˂1U)GWA-22SGWA-22S˂1U (˂1U)˂1U (˂1U)
GWA-23SGWA-23S˂1U (˂1U)˂1U (˂1U)
GWA-2SGWA-2S2.3 2.3 (1.1 )(1.1 )
GWA-3SAGWA-3SA1.3 1.3 (0.66J)(0.66J)
GWA-4SGWA-4S0.84J0.84J (0.37J)(0.37J)
GWA-5SGWA-5S˂1U (˂1U)˂1U (˂1U)
GGWWAA--66SS44..88 ((˂˂11UU))
GWA-7SGWA-7S3.5J+3.5J+ (1UJ)(1UJ)
GWA-8SGWA-8S˂1U (˂1U)˂1U (˂1U)
GWA-9SGWA-9S0.52J+0.52J+ (0.42J+)(0.42J+)
MW-10MW-101.2 1.2 (0.46J)(0.46J)
MW-11SRMW-11SR1.4 1.4 (1.3 )(1.3 )
MW-13MW-131UJ1UJ (1UJ)(1UJ)
MW-14MW-142.6J+2.6J+ (2.6J+)(2.6J+)
MW-15MW-152.7 2.7 (˂1U) (˂1U)
MW-1SMW-1S1UJ1UJ (1UJ)(1UJ)
MW-3SMW-3S0.6J+0.6J+ (0.54J+)(0.54J+)
MW-5SMW-5S˂1U ˂1U (0.53J)(0.53J)
MW-6SMW-6S0.35J0.35J (0.3J) (0.3J)
MMWW--88II22..88 ((00..9944JJ))MW-8SMW-8S0.32J+0.32J+ (0.45J+)(0.45J+)
MW-9MW-92.7 2.7 (2.1J+)(2.1J+)
VANADIUM ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
IMAC CONTOUR
ISOCONCENTRATION CONTOUR
DATE
FIGURE
AUGUST 2015
10-149
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR VANADIUM IS 0.3 µg/LNON DETECT CONTOUR CONCENTRATION IS 1 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
&<&<
&<
&<
&<
&<
&<
&<
&<
&<
&<
11 00
1 01 0
1 01 0
1 0 1 0
1 01 0
1010
1100
1
0
1
0
33
33
33
3
3
33
33
33
33
3 3
33 33
3 3
3 3
33
1 0 1 0
0.30.3
0
.
3
0
.
3
0.30.3
0.30.3
0
.
3
0
.
3
0.3
0.3
0 .30.3
0.30.3
0 .30.3
0 .30.3
0.30.3
0 .3 0 .3
0 .30.3
0 .30.3
0 0 ..3 3
0 .3 0 .3
S R -2 0 7 4
S R -1 9 1 2
AABB--11DD2200((1111..55 ))
AABB--22DD3322..44 ((3311..11 ))
AABB--33DD1111..55 ((77..44 ))
AABB--44DD2244((2244..11 ))
AB-5DAB-5D12.5 12.5 (12.7 )(12.7 )
AABB--77DD4400..55 ((4411..11 ))
AB-8DAB-8D2.7 2.7 (2.3 )(2.3 )
AS-1DAS-1D14.4 14.4 (13.4 )(13.4 )
AS-2DAS-2D34.6 34.6 (31.8 )(31.8 )
AS-3DAS-3D18.2 18.2 (17.2 )(17.2 )BBGG--11DD2222((2200 ))
BBGG--22DD2299..99 ((2299..22 ))
BG-3DBG-3D3.7 3.7 (3.1 )(3.1 )
C-2DC-2D10.9 10.9 (9.5 )(9.5 )
GWA-10DGWA-10D6.8 6.8 (7.7 )(7.7 )
GWA-1DGWA-1D21 21 (16.9 )(16.9 )
GWA-20DGWA-20D2.1 2.1 (0.66J)(0.66J)GWA-22DGWA-22D18.5 18.5 (16.1 )(16.1 )
GWA-23DGWA-23D34.1 34.1 (31.9 )(31.9 )
GWA-3DGWA-3D4.6 4.6 (4.3 )(4.3 )
GWA-4DGWA-4D2.4 2.4 (2.4 )(2.4 )
GGWWAA--55DD1133..99 ((1133..99 ))
GGWWAA--66DD2288((2266..99 ))
GGWWAA--77DD1122..11 ((1111..66 ))
GGWWAA--88DD55..55 ((55..55 ))
GGWWAA--99DD22..88 ((22..33 ))
MW-11DRMW-11DR2.12.1
MW-15DMW-15D22.4 22.4 (23.6 )(23.6 )
MW-1DMW-1D2.1J+2.1J+ (1.9J+)(1.9J+)
MW-2DMW-2D4.7 4.7 (4.5 )(4.5 )
MMWW--33DD66..22 ((55..88 ))
MMWW--44DD11..11 ((˂˂11UU))
MMWW--55DD88..66 ((88..55 ))
MMWW--66DD33..88 ((33..77 ))
MW-8DMW-8D4.1 4.1 (1.2 )(1.2 )
MW-9DMW-9D12.8 12.8 (12.5 )(12.5 )
VANADIUM ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
&<COMPLIANCE GROUNDWATER MONITORING WELL
&<VOLUNTARY GROUNDWATER MONITORING WELL
IMAC CONTOUR
ISOCONCENTRATION CONTOUR
DATE
FIGURE
AUGUST 2015
10-150
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR VANADIUM IS 0.3 µg/LNON DETECT CONTOUR CONCENTRATION IS 1 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
&<
&<
&<
&<
&<&<
&<&<
&<
&<
&<
&<
&<
&<
1 1 0 0
1 01 0
1010
11
0
0
1
0
1
0
3 3
3 3
3 3
3 3
33
33
33
33
33
00..33
0
.
3
0
.
3
0.30.3
00
..
33
0 .3 0 .3
0.30.3
S R -2 0 7 4
S R -1 9 1 2
AABB--33BBRR3322..11 ((1199 ))
AB-6BRUAB-6BRU18.6 18.6 (11.4 )(11.4 )
BBGG--22BBRR44..66 ((22..77 ))
GWA-20BRGWA-20BR3.43 3.43 (3.1 )(3.1 )GWA-22BRGWA-22BR4.33 4.33 (9.95 )(9.95 )
GWA-23BRGWA-23BR5.3 5.3 (3.9 )(3.9 )
GWA-2BRGWA-2BR11.8 11.8 (12.3 )(12.3 )
GWA-2BRUGWA-2BRU4 4 (1 )(1 )
GWA-4BRGWA-4BR0.9 0.9 (0.753 )(0.753 )
GGWWAA--77BBRR1100..99 ((1100..99 ))
GWA-9BRGWA-9BR67.567.5
MW-15BRMW-15BR2.2 2.2 (2.1 )(2.1 )
MMWW--77BBRR22..11 ((22..11 ))
MW-9BRMW-9BR7.8 7.8 (7.8 )(7.8 )
VANADIUM ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
LEGEND:
&<GROUNDWATER ASSESSMENT MONITORING WELL
IMAC CONTOUR
ISOCONCENTRATION CONTOUR
DATE
FIGURE
AUGUST 2015
10-151
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
300 0 300 600
SCALE (FEET)
NOTES:
GROUNDWATER IMAC FOR VANADIUM IS 0.3 µg/LNON DETECT CONTOUR CONCENTRATION IS 1 µg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (µg/L)
2.5 TOTAL CONCENTRATION(2.1) DISSOLVED CONCENTRATIONU LESS THAN LABORATORY REPORTING LIMITJ ESTIMATED CONCENTRATIONJ+ ESTIMATED CONCENTRATION (BIASED HIGH)
1 12 I 3 14 I 5 16 17 18
A
SOUTHWEST
800 F----.
70,
GWE
z
0
a
w
w
G WA-4BR
Jig/L)
hromium
38.1
ed Solids
1,500,000
anadium
0.9
50W
0 200 400 600 800
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
AS-2D
1000 1200
DISTANCE (ft)
SECTION A
SCALE: HORIZ 1 "=100' IFIC 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
1400
AS-3D
1600
NOT FOR
CONSTRUCTION
AS-3D
Ana to (jig/ L
Anti mon ' 1.6
Chromium 23.5
%vanadium 18.2
1800
2000
NORTHEAST
1 800
700
LLJ
C'
L_
600
LLJ
Z
J
2
U
Q
--J 500
2200
DUKE ENERGY CAROLINASILIC
/� DUKE
ENERGY.:
GASTON COUNTY'
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
ANALYTE
NC 2L
GROUNDWATER IMAC
ANTIMONY
1**
ARSENIC
10
BARIUM
700
BERYLLIUM
4**
� CADMIUM UM
200
CHLORIDE***
250,000
CHROMIUM
10
COBALT
1**
COPPER***
1,000
IRON
300
I LEAD
15
(MANGANESE
50
MERCURY
1
NICKEL
100
NITRATE***
10,000
NITRATE AS N***
1.000
pH (field)
6.5 - 8.5
SELENIUM
20
SULFATE***
250,000
THALLIUM
0.2
TOTAL DISSOLVED SOLIDS
500,000
VANADIUM
0.3**
ZINC***
1000
** Interim Maximum Allowable Concentration (IMAC)
*** Unit reported in mg/L in standard, converted
here to lug/L to match units displayed on figure.
All units shown in pug/L except pH which is
standard units.
NOTES:
U = NOT DETECTED ABOVE LABORATORY
REPORTING LIMIT
J = ESTIMATED CONCENTRATION
3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
*DNE = DOES NOT EXCEED
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC < 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION A -A'
GROUNDWATER ANALYTICAL RESULTS
0 1" Z, FILENAME
SCALE AS NOTED
D
C
B
IA
SHEET
FIGURE 10- .1

1 1 2 1 3 1 4 1 5 1 6 1 7 1 8
SOUTHWEST
800
700
I
O
LL.I
z
0
j W
w z
J
W J
_
U
Q
600
AB- 7S
Ana lyte 1 L
Arsenic
Cobalt
Iron
Manganese,
Vanadiurn
AB- 7I
Ana lyte (p / L
Cobalt
1
Iron
A
Man anese
L
500 1-
2200
AB- I U
Ana lyte J L
Antimony 7.5
Chromium 24.7
Vanadiuml 40.5
'N%% N"*�
AB-3BR I
AB-3D Fff 1K1TC0AAC-n1ATC nA\A
--—————————————— — — — ---
WATER
IN BASIN
AB-21a
Ana a /L
Chromium 13
Vanadium 32.4
AB-2D
AB-2S II
SECONDARY DAM
AB-2S
Anal a /L
Antimony
Cobalt
Iron
Manganese
Vanadium
Vanadium 2.8
GWA-9BR
Arsenic
Chromium
Iran
Vanadium
2400 2600 2800 3000 3200 3400 3600 3800 4000 4200
DISTANCE (ft)
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
SECTION A
SCALE: HORIZ 1 "=100' IFIC 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NOT FOR
CONSTRUCTION
10.7
40.6
450
67.5
A'
NORTHEAST
1 800
700
GWA-9BR
GWA-9S
]P
GWA-9S
Arm lyte / L
Cobalt 50.1
Manganese 2900
Vanadium 0.52 3+
Iwo]
J 500
4400
DUKE ENERGY CAROLINAS.LLC
/� DUKE
ENERGY.:
GASTON COUNTN
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
■C
ANALYTE
NC 2L
GROUNDWATER IMAC
ANTIMONY
1**
ARSENIC
10
BARIUM
700
BERYLLIUM
4**
BORON
700
CADMIUM
2
CHLORIDE***
250,000
CHROMIUM
10
COBALT
1**
COPPER***
1,000
IRON
300
I LEAD
15
(MANGANESE
50
MERCURY
1
NICKEL
100
NITRATE***
10,000
NITRATE AS N***
1.000
pH (field)
6.5 - 8.5
SELENIUM
20
SULFATE***
250,000
THALLIUM
0.2
TOTAL DISSOLVED SOLIDS
500,000
VANADIUM
0.3**
ZINC*** 1000 I C
** Interim Maximum Allowable Concentration (IMAC)
*** Unit reported in mg/L in standard, converted
here to pug/L to match units displayed on figure.
All units shown in pug/L except pH which is
standard units.
NOTES:
U = NOT DETECTED ABOVE LABORATORY
REPORTING LIMIT
J = ESTIMATED CONCENTRATION
3.0 = LESS THAN LABORATORY REPORTING LIMIT I—
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
*DNE = DOES NOT EXCEED
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC < 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION A -A'
GROUNDWATER ANALYTICAL RESULTS
0 1" 2° FILENAME
SCALE AS NOTED
/W
SHEET
FIGURE 10- .2

1
2 1 3
5
n.
7
:
w
r
r
B
WEST
800
700 —
a�
Cf)�
M I
I
3i0
CD
r,-- GWA-3S
650
.••
550
500 1-
0
GWA-3D
knalyte (Ng/L)
Cobalt
1.1
Manganese
9200
Sulfate
1310000
Total Dissolved Solids
2390000
Vanadium
4.6
GWA- 3SA
Ana lyte / L
Coba1t
18.4
Iro n
420
Manganese
12700
Sulfate
1420000
Total Dissolved Solids
23000000
Vanadium
1.3
200
400
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
C-1BRU C-1S
i
C-2D
C-is
Analyte WglL)
Arsenic
Cobalt
Iron
25.8
102
175000
Manganese
3200
Sulfate
559000
Total Dissolved Solids
1110000
F,
Vanadium
4
C-2D
Analyte (Ng/L)
Vanadiuml 10.9
ISSUE DATE DESCRIPTION
C-2S
C-2S
Analyte [pg/I
Cobalt
Manganese
Vanadium
39.7
600
0.523
AB-8D
Ana to / L
flan anew 140
Vanadium2.7
1200 1400
DISTANCE (ft)
SECTION B
SCALE: HORIZ 1 "=100' IFIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
1600
NOT FOR
CONSTRUCTION
PRIMARY DAM
AB-8S
Analyte (Ng/L)
Manganese
Vanadium
15Q
0.793
AB-5SL
Analyte / L
Antiniony ti.2
Arsenic 5.1
Boron 2400
Vanadium 151
AB -SD
Ana lyte / L
Antimony 1.2
Vanadium 12.5
2000
2200
.. , Milo
o 10,
iI
DUKE ENERGY CAROLINAS,LLC
/� DUKE
AENERGY..
GASTON COUNTN
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
EAST
800
700
AB -SS
Analyte
/ L
Antimony
21.6
f Arsenio
651
Boron
1400
iron
660
Thallium
0.48
Vanadium
2-31
�E
1 50
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
ANALYTE
NC 2L
GROUNDWATER IMAC
ANTIMONY
1**
ARSENIC
10
BARIUM
700
BERYLLIUM
4**
BORON
700
CADMIUM
2
CHLORIDE***
250,000
1 CHROMIUM
10
COBALT
1**
COPPER***
1,000
IRON
300
I LEAD
15
(MANGANESE
50
MERCURY
1
NICKEL
100
NITRATE***
10,000
1 NITRATE AS N***
1.000
pH (field)
6.5 - 8.5
SELENIUM
20
SULFATE***
250,000
THALLIUM
0.2
TOTAL DISSOLVED SOLIDS
500,000
VANADIUM
0.3**
ZINC***
1000
6
** Interim Maximum Allowable Concentration (IMAC)
*** Unit reported in mg/L in standard, converted
here to pug/L to match units displayed on figure.
All units shown in pug/L except pH which is
standard units.
NOTES:
U = NOT DETECTED ABOVE LABORATORY
REPORTING LIMIT
J = ESTIMATED CONCENTRATION
No
3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
O
J- = ESTIMATED CONCENTRATION BIASED LOW
W *DNE = DOES NOT EXCEED
U
LLL
550
Z
J
U
Q
500
2400 2600
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC < 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION B-B'
GROUNDWATER ANALYTICAL RESULTS
0 1" 2° FILENAME
SCALE AS NOTED
C
C
SHEET
FIGURE 10- .1

1
2
3
5
A
7
:
WEST
800
700
6
O
z •-
0
Q Lv
J
W
LLL
600
LL.I
Z
J
U
�Q
550
500
B'
EAST
AB -IS
Ana to f L
INTERMEDIATE DAM Antimony 3.2
Cobalt 15.9
AB-4D
WATER SECONDARY DAM AB-1 D Iron 510
- AB-4S IN BASIN AB-1S
Manganese 250
Vanadium 1.8
i
MW-13
R- - _ _ CATAWBA RIVER
Arsenic
MOUNTAIN ISLAND LAKE
AB-1 [
Ana e f L
Antimony 6.3
Chromium 49.2
Cobalt 2.9
==J
Mom iron 370
Vanadium 20
AB-4D
Ana to j L
Antimony1.2
Vanadium 24
Antimony 2.2
42$
Cobalt 5.7
Manganese 1,240
Vanadium 166
AB-45
Analyte CN91�]
h7W-13
Ana e L)
2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800
DISTANCE (ft)
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
SECTION rB
SCALE: HORIZ 1 "=40' FIG 11-1
VERT 1"=10'
PROJECT MANAGER
DRAWN BY: -
DESIGNED BY: -
CHECKED BY: -
APPROVED BY: -
PROJECT NUMBER 000000000246403
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINASILIC
/� DUKE
ENERGY.:
GASTON COUNTY
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
700
650
550
500
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
C
ANALYTE
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINASILIC
/� DUKE
ENERGY.:
GASTON COUNTY
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
700
650
550
500
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
C
ANALYTE
NC 2L
GROUNDWATER IMAC
ANTIMONY
1**
� ARSENIC
10 �
� BARIUM
700 �
BERYLLIUM
4** �
BORON
700 �
� CADMIUM
2 �
� CHLORIDE***
250,000 �
CHOBOMIUM
10
**
� COPPER***
1,000 �
� IRON
300 �
I LEAD
15 �
(MANGANESE
50 �
I MERCURY
1 �
� NICKEL
100 �
� NITRATE***
10,000 �
� NITRATE AS N***
1.000 �
pH (field)
6.5 - 8.5
� SELENIUM
20 �
� SULFATE***
250,000 �
� THALLIUM
0.2 �
� TOTAL DISSOLVED SOLIDS
500,000 �
VANADIUM
0.3**
ZINC*** 1000 I C
** Interim Maximum Allowable Concentration (IMAC)
*** Unit reported in mg/L in standard, converted
here to pug/L to match units displayed on figure.
All units shown in pug/L except pH which is
standard units.
NOTES:
U = NOT DETECTED ABOVE LABORATORY
REPORTING LIMIT
J = ESTIMATED CONCENTRATION
3.0 = LESS THAN LABORATORY REPORTING LIMIT l---
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOWLV
*DNE = DOES NOT EXCEED
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH -ASH
F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >- 50% OR REC S 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >- 85% AND RQD >- 50%
CROSS SECTION B-B'
GROUNDWATER ANALYTICAL RESULTS
0 1" 2- FILENAME
SCALE AS NOTED
SHEET
FIGURE 10- .2

HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
1 000000000246403
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINAS,LLC
DUKE
ENERGY.:
GASTON COUNTY
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
CROSS SECTION C-Cl
GROUNDWATER ANALYTICAL RESULTS
0 1" 2° FILENAME
SCALE I AS NOTED
SHEET
FIGURE 10-

HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY: -
DESIGNED BY: -
CHECKED BY: -
APPROVED BY: -
PROJECTNUMBER 000000000246403
DUKE ENERGY CAROLINAS,LLC
RIVERBEND STEAM STATION
NOT FDUKE OR �� COMPREHENSIVE SITE
ENERGY,
CONSTRUCTION ASSESSMENT
NORTH CAROLINA
C
c
0
0
CROSS SECTION D-D'
GROUNDWATER ANALYTICAL RESULTS
V. 2-- FILENAME SHEET
SCALE AS NOTED FIGURE 10-

1
2
3
5
1.1
7
:
E
NORTH
800
70
650
I,
a
w
J
LIJ MW-9D
M
500
400
MW-9D
Ana lyte / L
Say rn pie 1
Sample 2
Antimony
5.4
2.7
Chromium
20.6
27
Vanadium
12.5
12.8
MW-9BR
Ana a /L
Antimonyl 2.3
Vanadium 7.8
AS- 2D
Ana lyte / L
Chromium 22.5
Vanadium 34.6
AS-2S
Anallyte (N9/L)
Chromium
44.8
Cobalt
12.4
Iran
2090
Manganese
640
Vanadium
3.9
GWA-23D
Ana to 1 L
Chromium 55
Vanadium 34.1
E'
SOUTH
800
GWA--23BR
I
1 q I GWA-23S
1' ' ' 400
0 200 400 600 800 1000 1200 1400 1600
DISTANCE (ft)
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
SECTION E
SCALE: HORIZ 1 "=80' IFIG 11-1
VERT 1 "=40'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINASILIC
/� DUKE
ENERGY.:
GASTON COUNTN
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
ANALYTE
NC 2L
GROUNDWATER IMAC
ANTIMONY
1**
ARSENIC
10
BARIUM
700
BERYLLIUM
4**
BORON
700
CADMIUM
2
CHLORIDE***
250,000
CHROMIUM
10
COBALT
1**
COPPER***
1,000
IRON
300
I LEAD
15
(MANGANESE
50
MERCURY
1
NICKEL
100
NITRATE***
10,000
NITRATE AS N***
1.000
pH (field)
6.5 — 8.5
SELENIUM
20
SULFATE***
250,000
THALLIUM
0.2
TOTAL DISSOLVED SOLIDS
500,000
VANADIUM
0.3**
ZINC***
1000
** Interim Maximum Allowable Concentration (IMAC)
*** Unit reported in mg/L in standard, converted
here to lug/L to match units displayed on figure.
All units shown in pug/L except pH which is
standard units.
NOTES:
U = NOT DETECTED ABOVE LABORATORY
REPORTING LIMIT
J = ESTIMATED CONCENTRATION
3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J— = ESTIMATED CONCENTRATION BIASED LOW
*DNE = DOES NOT EXCEED
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH — ASH
F — FILL
S — ALLUVIUM
M1 — SOIL/SAPROLITE; N < 50
M2 — SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC < 50%
TZ — PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR — SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION E-El
GROUNDWATER ANALYTICAL RESULTS
0 1" 2° FILENAME
SCALE AS NOTED
SHEET
FIGURE 10-
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AUGUST 2015 10-
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AUGUST 2015 10-
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1
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a
b
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.
DATE
SU
L
F
A
T
E

:

C
H
L
O
R
I
D
E

R
A
T
I
O
S

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N

S
H
A
L
L
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W

W
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L
L
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DU
K
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N
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G
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A
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C
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D

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A
M

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A
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N

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S
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A
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FIGURE
GA
S
T
O
N

C
O
U
N
T
Y
,

N
O
R
T
H

C
A
R
O
L
I
N
A
AUGUST 2015 10-
GW
A
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1
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(
W
G
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G
W
A
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2
0
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W
G
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G
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2
2
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G
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G
W
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2
3
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(
W
G
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W
A
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2
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(
W
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G
W
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3
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(
W
G
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G
W
A
-
4
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(
W
G
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G
W
A
-
5
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(
W
G
)

G
W
A
-
6
S

(
W
G
)

G
W
A
-
7
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(
W
G
)

G
W
A
-
8
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(
W
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3
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2
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b
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DATE
SU
L
F
A
T
E

:

C
H
L
O
R
I
D
E

R
A
T
I
O
S

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N

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A
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L
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W

W
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L
L
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DU
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N
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G
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A
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A
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N

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A
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FIGURE
GA
S
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O
N

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O
U
N
T
Y
,

N
O
R
T
H

C
A
R
O
L
I
N
A
AUGUST 2015 10-
GW
A
-
9
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(
W
G
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M
W
-
1
0

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W
G
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W
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1
1
S
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G
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M
W
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1
3

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M
W
-
1
4

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W
G
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M
W
-
1
5

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W
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M
W
-
1
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(
W
G
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M
W
-
3
S

(
W
G
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M
W
-
5
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W
G
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M
W
-
6
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(
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DATE
SU
L
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:

C
H
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A
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L
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FIGURE
GA
S
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O
N

C
O
U
N
T
Y
,

N
O
R
T
H

C
A
R
O
L
I
N
A
AUGUST 2015 10-
MW
-
8
D

(
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)

M
W
-
8
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W
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8
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(
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DATE
SU
L
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A
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E

:

C
H
L
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R
A
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S

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N

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O
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Y
,

N
O
R
T
H

C
A
R
O
L
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A
AUGUST 2015 10-
BG
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1
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(
W
G
)

B
G
-
1
S

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W
G
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G
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2
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B
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2
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2
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3
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3
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DATE
SU
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:

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Y
,

N
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T
H

C
A
R
O
L
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A
AUGUST 2015 10-
AB
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3
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(
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B
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3
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(
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A
B
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B
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6
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S
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7
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DATE
SU
L
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:

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S
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O
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N
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Y
,

N
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H

C
A
R
O
L
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A
AUGUST 2015 10-
RB
S
W
0
0
1

(
S
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B
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0
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4

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6

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7

(
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8

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9

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a
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.
DATE
SU
L
F
A
T
E

:

C
H
L
O
R
I
D
E

R
A
T
I
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S

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N

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L
L
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N
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S
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Y
,

N
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R
T
H

C
A
R
O
L
I
N
A
AUGUST 2015 10-
AB
-
3
B
R

(
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G
)

A
B
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6
B
R
U

(
W
G
)

B
G
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2
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(
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GW
A
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2
0
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(W
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)
GW
A
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2
2
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(W
G
)
GW
A
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2
3
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GW
A
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(
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GW
A
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2
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GW
A
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4
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R

(
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G
W
A
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7
B
R

(
W
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)

G
W
A
-
9
B
R

(
W
G
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M
W
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1
5
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R

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M
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7
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M
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9
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DATE
PIPER DIAGRAM -ASH BASIN POREWATER, WATER, AND AUGUST 2015
F)l BACKGROUND MONITORING WELLS
DUKE ENERGY CAROLINAS, LLC FIGURE
RIVERBEND STEAM STATION ASH BASIN 10-
GASTON COUNTY. NORTH CAROLINA

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NOTE: Nitrate plus Nitrite was reported by the laboratory and is used here. Equivalent weight of 54 used (average of nitrate and nitrite)
DATE
PIPER DIAGRAM -ASH BASIN POREWATER, WATER, AND AUGUST 2015
F)l SEEPS
DUKE ENERGY CAROLINAS, LLC FIGURE
RIVERBEND STEAM STATION ASH BASIN 10-
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ANIONS
NOTE: Nitrate plus Nitrite was reported by the laboratory and is used here. Equivalent weight of 54 used (average of nitrate and nitrite).
DATE
PIPER DIAGRAM -ASH BASIN POREWATER, WATER, AND AUGUST 2015
F)l DOWNGRADIENT "S", "D", AND "BR" MONITORING WELLS
DUKE ENERGY CAROLINAS, LLC FIGURE
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DATE
PIPER DIAGRAM -ASH BASIN POREWATER, WATER, AND AUGUST 2015
F)l UPGRADIENT "S", "D", AND "BR" MONITORING WELLS
DUKE ENERGY CAROLINAS, LLC FIGURE
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Equivalent weight of 54 used (average of nitrate and nitrite).
PIPER DIAGRAM -ASH BASIN POREWATER,
"S", "D", AND "BR" MONITORING WELLS
DATE
DUKE ENERGY CAROLINAS, LLC
AUGUST 2015
F)l
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GASTON COUNTY, NORTH CAROLINA

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CATIONS ANIONS
NOTE: Nitrate plus Nitrite was reported by the laboratory and is used here. Equivalent weight of 54 used (average of nitrate and nitrite).
DATE
PIPER DIAGRAM - ASH BASIN "S" WELLS AND SEEPS
DUKE ENERGY CAROLINAS, LLC AUGUST 2015
F)l RIVERBEND STEAM STATION ASH BASIN FIGURE
10-
GASTON COUNTY, NORTH CAROLINA

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AUGUST 2015
10-TBD
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DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
LEGEND
&<ASH BASIN ASSESSMENTGROUNDWATER MONITORING WELL
&<ASH BASIN COMPLIANCEGROUNDWATER MONITORING WELL
&<ASH BASIN VOLUNTARY GROUNDWATERMONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARYCOINCIDENT WITH DUKE ENERGYPROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
NOTES:U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMITJ = ESTIMATED CONCENTRATION<3.0 = LESS THAN THE LABORATORY REPORTING LIMITJ+ = ESTIMATED CONCENTRATION BIASED HIGHJ- = ESTIMATED CONCENTRATION BIASED LOW
µG/L: MICROGRAMS PER LITER
500 0 500 1,000
SCALE (FEET)
Analyte AbbreviationBoronBCalciumCaChlorideCl-pH (field)pHSulfateSO4Total Dissolved Solids TDS
Sample MW-15Sample Date 6/23/2015Constituent (µg/L)B 280 Ca 3,930 Cl-6,000 SO4 29,000 TDS 227,000
Sample GWA-10SSample Date 7/2/2015Constituent (µg/L)B 170 Ca 5,040 Cl-5,700 SO4 31,000 TDS 109,000
Sample MW-13Sample Date 6/30/2015Constituent (µg/L)B 60 Ca 9,340 Cl-4,200 SO4 15,700 TDS 87,000
Sample AB-1SSample Date 7/9/2015Constituent (µg/L)Ca 1,170 Cl-5,300 SO4 690 JTDS 40,000
Sample MW-5SSample Date 6/25/2015Constituent (µg/L)B 330 Ca 889 Cl-7,000 SO4 10,200 TDS 58,000
Sample MW-6SSample Date 6/18/2015Constituent (µg/L)B 230 Ca 11,100 Cl-6,600 SO4 36,700 TDS 121,000
Sample MW-3SSample Date 6/30/2015Constituent (µg/L)B 260 Ca 13,800 Cl-7,100 SO4 29,900 TDS 118,000
Sample GWA-1SSample Date 7/2/2015Constituent (µg/L)Ca 4,160 Cl-5,200 TDS 78,000
Sample MW-11SR
Sample Date 7/2/2015Constituent (µg/L)B 360 Ca 9,290 Cl-6,000 SO4 37,600
Sample GWA-9SSample Date 6/30/2015Constituent (µg/L)B 200 Ca 2,170 Cl-6,800 SO4 26,500 TDS 60,000
Sample GWA-2S
Sample Date 6/22/2015Constituent (µg/L)B 460 Ca 13,200 Cl-5,800 SO4 36,100 TDS 132,000
Sample MW-10Sample Date 6/23/2015Constituent (µg/L)B 180 Ca 4,290 Cl-6,400 SO4 19,500 TDS 69,000 J
Sample AB-6SSample Date 6/22/2015Constituent (µg/L)B 45 JCa94,400 Cl-8,800 SO4 15,700 TDS 296,000
Sample MW-1SSample Date 6/29/2015Constituent (µg/L)B 300 Ca 2,010 Cl-10,700 SO4 1,200 J-TDS 60,000
Sample MW-9Sample Date 7/6/2015Constituent (µg/L)B 36 JCa12,400 Cl-2,200 SO4 24,600 TDS 114,000
Sample AB-8SSample Date 6/20/2015Constituent (µg/L)B 220 Ca 37,700 Cl-5,300 SO4 132,000 TDS 274,000
Sample C-2SSample Date 6/19/2015Constituent (µg/L)B 170 Ca 11,800 Cl-3,200 SO4 60,400 TDS 160,000 J+
Sample GWA-3SASample Date 7/1/2015Constituent (µg/L)Ca 367,000 Cl-6,100 SO4 1,420,000 TDS 23,000,000
Sample AS-1SSample Date 6/5/2015Constituent (µg/L)B 2,200 Ca 167,000 M6Cl-18,300 SO4 231,000 TDS 750,000 J-
Sample GWA-4SSample Date 7/10/2015Constituent (µg/L)Ca 25,200 Cl-2,900 SO4 84,700 TDS 187,000
Sample GWA-20SSample Date 7/11/2015Constituent (µg/L)Ca 2,780 Cl-8,100 SO4 980 JTDS31,000
Sample AS-2SSample Date 6/5/2015Constituent (µg/L)Ca 4,870 Cl-2,600 SO4 5,200 TDS 62,000 J-
Sample MW-8ISample Date 7/1/2015Constituent (µg/L)Ca 2,960 J+TDS 77,000
Sample MW-8SSample Date 6/30/2015Constituent (µg/L)Ca 345 Cl-7,000 SO4 580 J
Sample GWA-23SSample Date 7/10/2015Constituent (µg/L)Ca 858 Cl-2,300 TDS 27,000
Sample GWA-22SSample Date 7/10/2015Constituent (µg/L)Ca 696 Cl-2,800
Sample GWA-5SSample Date 6/18/2015Constituent (µg/L)Ca 915 Cl-980 J
Sample AB-7ISample Date 7/7/2015Constituent (µg/L)Ca 2,030 Cl-1,800 SO4 6,300 TDS 41,000
Sample GWA-6SSample Date 6/19/2015Constituent (µg/L)Ca 1,390 Cl-2,900 SO4 1,200 TDS 31,000 J+
Sample BG-1SSample Date 7/6/2015Constituent (µg/L)Ca 1,460 Cl-1,900 SO4 580 J
Sample BG-2SSample Date 7/10/2015Constituent (µg/L)Ca 11,000 Cl-8,900 SO4 2,900 TDS 87,000
Sample BG-3SSample Date 6/30/2015Constituent (µg/L)Ca 6,140 Cl-4,600 SO4 2,400 TDS 57,000
Sample GWA-7SSample Date 6/19/2015Constituent (µg/L)Ca 6,540 Cl-2,600 SO4 530 JTDS65,000 J+Sample GWA-8SSample Date 6/28/2015Constituent (µg/L)B 240 Ca 2,070 Cl-6,200 SO4 36,000 J+TDS 85,000
Sample MW-14Sample Date 6/30/2015Constituent (µg/L)B 130 Ca 6,790 Cl-13,500 SO4 30,100 TDS 138,000
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DETECTION MONITORING CONSTITUENTS DETECTED IN DEEP WELLS (D)
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AUGUST 2015
10-TBD
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DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
LEGEND
&<ASH BASIN ASSESSMENTGROUNDWATER MONITORING WELL
&<ASH BASIN COMPLIANCEGROUNDWATER MONITORING WELL
&<ASH BASIN VOLUNTARY GROUNDWATERMONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARYCOINCIDENT WITH DUKE ENERGYPROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
NOTES:U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMITJ = ESTIMATED CONCENTRATION<3.0 = LESS THAN THE LABORATORY REPORTING LIMITJ+ = ESTIMATED CONCENTRATION BIASED HIGHJ- = ESTIMATED CONCENTRATION BIASED LOW
µG/L: MICROGRAMS PER LITER
500 0 500 1,000
SCALE (FEET)
Analyte AbbreviationBoronBCalciumCaChlorideCl-pH (field)pHSulfateSO4Total Dissolved Solids TDS
Sample GWA-3DSample Date 6/17/2015Constituent (µg/L)B 34 JCa437,000 Cl-6,500 SO4 1,310,000 TDS 2,390,000
Sample GWA-4DSample Date 7/10/2015Constituent (µg/L)Ca 12,300 Cl-3,200 SO4 4,400 TDS 101,000
Sample AS-1DSample Date 6/5/2015Constituent (µg/L)Ca 111,000 Cl-5,700 SO4 21,300 TDS 390,000 J-
Sample C-2DSample Date 6/19/2015Constituent (µg/L)Ca 23,800 Cl-2,200 SO4 1,900 TDS 152,000 J+
Sample MW-9DSample Date 7/1/2015Constituent (µg/L)Ca 72,600 J-Cl-2,700 SO4 27,000 TDS 223,000
Sample AB-8DSample Date 6/17/2015Constituent (µg/L)B 440 Ca 61,300 Cl-5,800 SO4 136,000 TDS 361,000
Sample MW-1DSample Date 6/29/2015Constituent (µg/L)B 650 Ca 25,300 Cl-7,900 SO4 86,100 TDS 197,000
Sample AB-5DSample Date 6/20/2015Constituent (µg/L)B 150 Ca 42,600 Cl-4,700 SO4 56,300 TDS 214,000
Sample GWA-20DSample Date 7/16/2015Constituent (µg/L)Ca 758,000 J-Cl-9,800 SO4 376,000 J+TDS 2,900,000
Sample AS-2DSample Date 6/8/2015Constituent (µg/L)B 28 JCa69,900 M1Cl-4,100 SO4 26,000 TDS 280,000 J-
Sample MW-8D
Sample Date 7/1/2015Constituent (µg/L)Ca 5,760 Cl-1,200 TDS 111,000
Sample GWA-23DSample Date 7/16/2015Constituent (µg/L)Ca 46,400 Cl-2,600 SO4 10,600 TDS 196,000
Sample GWA-22DSample Date 7/10/2015Constituent (µg/L)Ca 44,400 Cl-5,700 SO4 23,500 TDS 214,000
Sample AS-3DSample Date 6/5/2015Constituent (µg/L)B 27 JCa20,400 Cl-3,100 SO4 18,000 TDS 110,000 J-
Sample GWA-5DSample Date 7/11/2015Constituent (µg/L)Ca 28,000 Cl-2,100 SO4 5,000 TDS 137,000
Sample AB-7DSample Date 7/1/2015Constituent (µg/L)Ca 70,100 Cl-7,200 SO4 46,500 TDS 326,000
Sample GWA-6DSample Date 6/19/2015Constituent (µg/L)Ca 47,800 Cl-2,400 SO4 15,500 TDS 184,000 J+
Sample AB-3DSample Date 7/7/2015Constituent (µg/L)Ca 283,000 Cl-6,400 SO4 144,000 TDS 946,000
Sample BG-1DSample Date 7/11/2015Constituent (µg/L)B 27 JCa83,300 Cl-6,100 J-SO4 48,400 J+TDS 555,000
Sample BG-2DSample Date 7/11/2015Constituent (µg/L)Ca 57,600 Cl-10,000 SO4 31,100 TDS 261,000
Sample BG-3DSample Date 7/6/2015Constituent (µg/L)Ca 9,430 Cl-2,800 SO4 1,100 TDS 231,000
Sample GWA-8DSample Date 6/28/2015Constituent (µg/L)B 110 Ca 14,600 Cl-6,300 SO4 23,800 J+TDS 128,000
Sample GWA-7DSample Date 6/17/2015Constituent (µg/L)Ca 24,500 Cl-4,400 SO4 32,300 TDS 176,000
Sample GWA-9DSample Date 7/1/2015Constituent (µg/L)B 260 J+Ca 14,100 Cl-6,700 SO4 33,200 TDS 26,000
Sample MW-5DSample Date 6/18/2015Constituent (µg/L)B 380 Ca 24,300 Cl-6,500 SO4 44,600 TDS 186,000
Sample AB-2DSample Date 7/8/2015Constituent (µg/L)B 160 Ca 64,000 Cl-6,400 SO4 22,700 TDS 241,000
Sample MW-5DSample Date 6/18/2015Constituent (µg/L)B 380 Ca 24,300 Cl-6,500 SO4 44,600 TDS 186,000
Sample AB-1DSample Date 7/9/2015Constituent (µg/L)B 65 Ca 123,000 Cl-4,900 SO4 22,800 TDS 351,000
Sample MW-4DSample Date 6/18/2015Constituent (µg/L)B 270 Ca 10,900 Cl-5,400 SO4 30,900 TDS 113,000
Sample GWA-10DSample Date 7/3/2015Constituent (µg/L)B 140 Ca 25,600 Cl-6,400 SO4 25,900 TDS 185,000
Sample MW-15DSample Date 6/18/2015Constituent (µg/L)B 170 Ca 52,700 Cl-6,200 SO4 40,100 TDS 241,000
Sample MW-3DSample Date 6/30/2015Constituent (µg/L)B 260 Ca 17,100 Cl-6,600 SO4 26,700 TDS 141,000
Sample GWA-1DSample Date 7/2/2015Constituent (µg/L)B 33 JCa47,400 Cl-3,200 SO4 8,700 TDS 232,000
Sample MW-11DRSample Date 7/2/2015Constituent (µg/L)B 320 Ca 9,150 Cl-5,900 SO4 36,000 TDS 140,000
Sample MW-2DSample Date 6/30/2015Constituent (µg/L)Ca 6,950 Cl-4,600 SO4 720 JTDS92,000
Sample AB-4DSample Date 7/8/2015Constituent (µg/L)Ca 32,900 Cl-2,500 SO4 13,100 TDS 159,000
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SR-207
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DETECTION MONITORING CONSTITUENTS DETECTED IN BEDROCK WELLS (BR AND BRU)
GASTON COUNTY, NORTH CAROLINA
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AUGUST 2015
10-TBD
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LEGEND
&<ASH BASIN ASSESSMENTGROUNDWATER MONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
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ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
NOTES:U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMITJ = ESTIMATED CONCENTRATION<3.0 = LESS THAN THE LABORATORY REPORTING LIMITJ+ = ESTIMATED CONCENTRATION BIASED HIGHJ- = ESTIMATED CONCENTRATION BIASED LOW
µG/L: MICROGRAMS PER LITER
500 0 500 1,000
SCALE (FEET)
Sample GWA-4BRSample Date 7/27/2015Constituent (µg/L)Ca 545,000 Cl-4,800 SO4 6,900 TDS 1,500,000
Sample GWA-20BRSample Date 7/27/2015Constituent (µg/L)Ca 97,600 Cl-1,900 SO4 5,800 TDS 380,000
Sample GWA-23BRSample Date 7/17/2015Constituent (µg/L)Ca 307,000 Cl-2,000 SO4 18,000 TDS 790,000
Sample GWA-22BRSample Date 7/21/2015Constituent (µg/L)Ca 303,000 Cl-7,400 SO4 21,000 TDS 360,000
Sample MW-9BRSample Date 7/2/2015Constituent (µg/L)Ca 56,200 Cl-6,300 SO4 18,000 TDS 107,000
Sample MW-15BRSample Date 6/23/2015Constituent (µg/L)B 260 Ca 8,160 Cl-7,500 SO4 39,500 TDS 232,000
Sample MW-7BRSample Date 7/10/2015Constituent (µg/L)Ca 537,000 Cl-4,900 SO4 7,200 TDS 1,180,000
Sample AB-6BRU AB-6BRUSample Date 6/22/2015 7/2/2015Constituent (µg/L)B 480 430 Ca 41,600 92,800 Cl-5,300 5,400 SO4 83,500 87,000 TDS 247,000 212,000
Sample GWA-7BRSample Date 7/7/2015Constituent (µg/L)Ca 33,600 Cl-3,000 SO4 21,500 TDS 141,000
Sample GWA-2BRSample Date 6/17/2015Constituent (µg/L)Ca 27,400 Cl-5,200 SO4 39,500 TDS 164,000
Sample GWA-9BRSample Date 7/10/2015Constituent (µg/L)B 210 Ca 17,500
Sample BG-2BRSample Date 7/17/2015Constituent (µg/L)Ca 24,200 Cl-2,200 SO4 8,200 TDS 118,000
Sample AB-3BRSample Date 7/23/2015Constituent (µg/L)Ca 31,300 Cl-2,200 SO4 17,000 TDS 160,000
Analyte AbbreviationBoronBCalciumCaChlorideCl-pH (field)pHSulfateSO4Total Dissolved Solids TDS
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ASSESSMENT MONITORING CONSTITUENTS DETECTED IN SHALLOW WELLS (S)
GASTON COUNTY, NORTH CAROLINA
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AUGUST 2015
10-104
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LEGEND
&<ASH BASIN ASSESSMENTGROUNDWATER MONITORING WELL
&<ASH BASIN COMPLIANCEGROUNDWATER MONITORING WELL
&<ASH BASIN VOLUNTARY GROUNDWATERMONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARYCOINCIDENT WITH DUKE ENERGYPROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
NOTES:U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMITJ = ESTIMATED CONCENTRATION<3.0 = LESS THAN THE LABORATORY REPORTING LIMITJ+ = ESTIMATED CONCENTRATION BIASED HIGHJ- = ESTIMATED CONCENTRATION BIASED LOW
µG/L: MICROGRAMS PER LITER
500 0 500 1,000
SCALE (FEET)
Analyte AbbreviationAntimonySbArsenicAsBariumBaBerylliumBeCadmiumCdChromiumCrCobaltCoLeadPbMercuryHgMolybdenum MoSeleniumSeThalliumTlRadium-226 Ra-226Radium-228 Ra-228
Sample GWA-3SASample Date 7/1/2015Constituent (µg/L)As 0.23 JBa100 Cd 0.19 Co 18.4 Cr 0.53 J+Mo 0.56 J+Pb 0.14 J+Sb 0.77 J+Se 5.7
Sample MW-9Sample Date 7/6/2015Constituent (µg/L)As 0.18 JBa58 Co 0.87 Cr 1.2 Mo 0.14 JPb0.21
Sample AB-8SSample Date 6/20/2015Constituent (µg/L)Ba 130 Be 0.18 JCd0.16 Co 0.55 Cr 3.8 Hg 0.11 J+Se 1.2 Tl 0.02 J
Sample MW-1SSample Date 6/29/2015Constituent (µg/L)Ba 22 Co 61 Cr 0.57 J+Mo 0.12 JPb0.064 J
Sample AB-6SSample Date 6/22/2015Constituent (µg/L)As 0.82 Ba 9 Co 0.31 JCr1.2 J+Mo 7.6 Pb 0.19 Sb 1.8 Se 2.6
Sample MW-10Sample Date 6/23/2015Constituent (µg/L)As 0.16 JBa56 Be 0.15 JCd0.082 Co 0.9 Cr 2.7 Hg 0.081 J+Pb 0.15 Se 0.53
Sample GWA-2SSample Date 6/22/2015Constituent (µg/L)As 0.28 JBa52 Co 0.34 JCr2.8 J+Hg 0.088 J+Mo 0.1 JPb0.076 J
Sample GWA-1SSample Date 7/2/2015Constituent (µg/L)Ba 60 Co 2.1 Cr 11.6 Mo 0.43 JPb0.21 J+Sb 0.28 J
Sample MW-3SSample Date 6/30/2015Constituent (µg/L)Ba 17 Co 0.14 JCr0.44 J+Pb 0.24
Sample MW-15Sample Date 6/23/2015Constituent (µg/L)As 0.25 JBa86 Be 0.22 Co 1.3 Cr 6.8 Hg 0.078 J+Pb 0.6 Se 2
Sample GWA-10SSample Date 7/2/2015Constituent (µg/L)Ba 29 Be 0.11 JCd0.032 JCo10 Cr 3.5 J
Sample MW-13Sample Date 6/30/2015Constituent (µg/L)As 0.39 JBa300 Co 23.7 Cr 0.38 J+Hg 0.072 JTl0.072 J
Sample AB-1SSample Date 7/9/2015Constituent (µg/L)As 0.17 JBa21 Be 0.12 JCo15.9 Cr 1.8 J+Hg 0.11 J+Mo 0.17 JPb0.18 Sb 3.2
Sample MW-5SSample Date 6/25/2015Constituent (µg/L)Ba 22 Be 0.072 JCo1.9 Cr 1.7 Hg 0.26 Pb 0.062 JSe0.29 J
Sample MW-6SSample Date 6/18/2015Constituent (µg/L)Ba 8.4 Co 0.2 JPb0.051 J Sample GWA-9SSample Date 6/30/2015Constituent (µg/L)Ba 30 Be 0.078 JCo50.1 Cr 0.32 J+Hg 0.11 JPb0.14 Tl 0.04 J
Sample MW-14Sample Date 6/30/2015Constituent (µg/L)Ba 7.8 Cr 1.7 J+Mo 0.37 J Sample GWA-8SSample Date 6/28/2015Constituent (µg/L)Ba 130 Cd 0.054 JCo66.8 Cr 6.4 J+Tl 0.031 J
Sample GWA-7S
Sample Date 6/19/2015Constituent (µg/L)As 0.2 J+Ba 39 Co 1 J+Cr 3.8 Hg 0.075 J+Pb 0.26
Sample BG-3SSample Date 6/30/2015Constituent (µg/L)Ba 33 Cd 0.031 JCo0.54 Cr 0.25 J+Hg 0.073 JMo0.14 JSb1.3 J+
Sample BG-2SSample Date 7/10/2015Constituent (µg/L)As 0.12 JBa71 Co 0.69 Cr 0.83 Mo 0.19 JSb0.33 JTl0.033 J+
Sample BG-1SSample Date 7/6/2015Constituent (µg/L)As 0.21 JBa42 Be 0.076 JCd0.034 JCo3 Cr 5.2 Mo 0.2 JPb0.61 Ra-226 1.01 J+Sb 0.43 JTl0.032 J
Sample GWA-6SSample Date 6/19/2015Constituent (µg/L)As 0.24 J+Ba 45 Be 0.079 JCd0.2 Co 27.6 Cr 1.7 J+Hg 0.073 J+Pb 0.59 Tl 0.054 J
Sample AB-7ISample Date 7/7/2015Constituent (µg/L)Ba 35 Cd 0.036 J+Co 1.6 Cr 0.9 J+Pb 0.11 J+Sb 1 J+Tl 0.048 J+
Sample GWA-5SSample Date 6/18/2015Constituent (µg/L)Ba 17 Co 4.5 Cr 0.57 J+Hg 0.11 J+Mo 0.19 J
Sample GWA-22SSample Date 7/10/2015Constituent (µg/L)Ba 34 Cd 0.075 JCo1.3 Cr 1.9 J+Mo 0.1 JPb0.071 JSb2.2 Tl 0.02 J
Sample GWA-23SSample Date 7/10/2015Constituent (µg/L)Ba 37 Cd 0.04 JCo3.3 Cr 3.2 J+Mo 0.13 JPb0.18 Sb 0.24 J
Sample MW-8ISample Date 7/1/2015Constituent (µg/L)As 0.12 JBa42 Be 0.24 J+Co 0.76 Cr 1.3 J+Mo 3.2 J+Pb 0.28 J+Tl 0.02 J
Sample AS-2SSample Date 6/5/2015Constituent (µg/L)As 0.42 JBa170 Be 0.21 Cd 0.13 Co 12.4 Cr 44.8 Mo 1.5 Pb 1.4 Sb 0.21 JTl0.11
Sample GWA-20SSample Date 7/11/2015Constituent (µg/L)As 3.3 Ba 67 Be 0.65 Cd 0.13 Co 12.7 Cr 133 Mo 14.3 Pb 7.5 Sb 0.22 JSe0.31 JTl0.087 J
Sample GWA-4SSample Date 7/10/2015Constituent (µg/L)Ba 26 Be 0.26 Cd 0.12 Co 1.7 Cr 2.1 Pb 0.083 JSe0.4 J
Sample AS-1SSample Date 6/5/2015Constituent (µg/L)As 1.4 Ba 100 Cd 0.054 JCo5.4 Cr 6.1 Mo 136 Pb 0.14 Sb 0.26 JSe0.49 JTl0.076 J
Sample C-2SSample Date 6/19/2015Constituent (µg/L)As 0.95 J+Ba 36 Be 1.9 Cd 0.21 Co 39.7 Cr 0.64 J+Hg 0.27 J+Pb 0.2 Se 1.5 Tl 0.09 J
SampleMW-9D (POSSIBLY NOT MW-9D-(CJM-8/1/15))Sample Date 7/2/2015Constituent (µg/L)As 0.28 JBa23 Cr 27 Mo 7 Pb 0.091 J+Sb 2.7 Se 0.38 J
Sample MW-8SSample Date 6/30/2015Constituent (µg/L)Ba 57 Be 0.089 JCd0.036 JCo0.23 JCr0.71 J+Pb 0.076 JSb0.83 J+Tl 0.033 J
Sample AB-2SSample Date 7/8/2015Constituent (µg/L)As 0.2 JBa28 Be 0.15 JCd0.065 JCo17.1 Cr 2.5 J+Mo 0.24 JPb0.29 Sb 3.1 Tl 0.072 J
Sample MW-11SRSample Date 7/2/2015Constituent (µg/L)Ba 25 Cd 0.026 JCr1.8 JMo0.16 JSb0.87 Se 0.71
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C a t a w b a R i v e r
SR-207
4
SR-1912
ASSESSMENT MONITORING CONSTITUENTS DETECTED IN DEEP WELLS (D)
GASTON COUNTY, NORTH CAROLINA
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DATE
FIGURE
AUGUST 2015
10-TBD
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
LEGEND
&<ASH BASIN ASSESSMENTGROUNDWATER MONITORING WELL
&<ASH BASIN COMPLIANCEGROUNDWATER MONITORING WELL
&<ASH BASIN VOLUNTARY GROUNDWATERMONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARYCOINCIDENT WITH DUKE ENERGYPROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
NOTES:U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMITJ = ESTIMATED CONCENTRATION<3.0 = LESS THAN THE LABORATORY REPORTING LIMITJ+ = ESTIMATED CONCENTRATION BIASED HIGHJ- = ESTIMATED CONCENTRATION BIASED LOW
µG/L: MICROGRAMS PER LITER
500 0 500 1,000
SCALE (FEET)
Analyte AbbreviationAntimonySbArsenicAsBariumBaBerylliumBeCadmiumCdChromiumCrCobaltCoLeadPbMercuryHgMolybdenum MoSeleniumSeThalliumTlRadium-226 Ra-226Radium-228 Ra-228
Sample GWA-4D
Sample Date 7/10/2015Constituent (µg/L)As 0.22 JBa26 Co 0.52 Cr 2.1 Mo 1
Sample AS-1D
Sample Date 6/5/2015Constituent (µg/L)As 0.68 Ba 51 Co 0.18 JCr903 Mo 57.4 Pb 0.11 Sb 3 Se 1.1
Sample C-2DSample Date 6/19/2015Constituent (µg/L)As 1.3 J+Ba 19 Cr 2.5 J+Hg 0.085 J+Mo 1.1 J+
Sample GWA-3DSample Date 6/17/2015Constituent (µg/L)As 0.65 Ba 49 Cd 0.11 Co 1.1 Cr 1.1 Hg 0.13 J+Mo 6.8 Se 5.2
Sample MW-9D
Sample Date 7/1/2015Constituent (µg/L)As 0.38 JBa21 Cr 20.6 Mo 6 J+Sb 5.4 Se 0.38 J
Sample AB-8DSample Date 6/17/2015Constituent (µg/L)As 0.17 JBa45 Co 0.73 Cr 1.4 Hg 0.11 J+Mo 1.3 Se 0.34 J
Sample MW-1D
Sample Date 6/29/2015Constituent (µg/L)Ba 31 Cd 0.12 Co 0.51 Cr 0.8 J+Hg 0.11 JPb0.064 JSe0.28 JTl0.034 J
Sample AB-5D
Sample Date 6/20/2015Constituent (µg/L)As 0.25 JBa27 Cr 5.3 Mo 5.4 Sb 1.2 Se 0.31 J
Sample AB-4D
Sample Date 7/8/2015Constituent (µg/L)As 0.65 Ba 18 Co 0.18 JCr7.4 Mo 3.3 Pb 0.055 JSb1.2 Se 0.47 J
Sample MW-2DSample Date 6/30/2015Constituent (µg/L)Ba 23 Co 0.14 JCr3.6 J+Mo 0.12 J
Sample GWA-1DSample Date 7/2/2015Constituent (µg/L)As 0.93 Ba 18 Co 0.55 Cr 6.1 Mo 10.5 Pb 0.13 J+Sb 3.2
Sample MW-3DSample Date 6/30/2015Constituent (µg/L)Ba 7.7 Cr 1.7 J+Hg 0.088 JPb0.09 J
Sample MW-15D
Sample Date 6/18/2015Constituent (µg/L)As 1 Ba 9.1 Cr 3.5 Hg 0.073 JMo10.7 Pb 0.059 JSb0.74 Se 1.1
Sample GWA-10D
Sample Date 7/3/2015Constituent (µg/L)As 0.29 JBa58 Co 0.19 JCr6.1 Mo 4.1 Pb 0.42 Sb 1.1 Se 0.41 J
Sample MW-4DSample Date 6/18/2015Constituent (µg/L)Ba 65 Co 0.67 Cr 1.4 J+Hg 0.15 JPb0.058 J
Sample AB-1D
Sample Date 7/9/2015Constituent (µg/L)As 0.84 Ba 30 Be 0.068 JCd0.031 JCo2.9 Cr 49.2 Hg 0.09 JMo4.6 Pb 0.85 Sb 6.3 Se 0.46 JTl0.064 J
Sample MW-5D
Sample Date 6/18/2015Constituent (µg/L)Ba 32 Co 0.24 JCr2.7 J+Hg 0.095 J+Mo 0.24 JPb0.082 J
Sample AB-2DSample Date 7/8/2015Constituent (µg/L)As 0.72 Ba 13 Cd 0.045 JCo0.15 JCr13 Mo 8.9 Pb 0.13 Sb 1 Se 0.57 Tl 0.06 J
Sample MW-6DSample Date 6/18/2015Constituent (µg/L)Ba 7.4 Cr 1.9 J+Mo 0.18 JPb0.051 J
Sample GWA-9DSample Date 7/1/2015Constituent (µg/L)As 0.13 JBa9.4 Co 0.58 Cr 0.39 J+Mo 0.47 J+Pb 0.074 J+
Sample GWA-8DSample Date 6/28/2015Constituent (µg/L)Ba 5.3 Co 0.7 Cr 4.2 J+Mo 0.68 J+Pb 0.072 J+
Sample GWA-7D
Sample Date 6/17/2015Constituent (µg/L)As 0.48 JBa13 Co 0.63 Cr 3.3 Hg 0.13 J+Mo 2.5 Pb 0.35 Sb 0.17 JSe0.24 JTl0.018 J
Sample BG-3D
Sample Date 7/6/2015Constituent (µg/L)As 0.81 Ba 50 Be 0.53 Co 0.84 Cr 0.97 J+Mo 2.8 Pb 5.1 Sb 0.16 JSe0.23 J
Sample BG-2DSample Date 7/11/2015Constituent (µg/L)As 0.66 Ba 42 Cd 0.05 JCr57.5 Mo 5.2 Pb 0.093 JSb0.72 Se 2.9
Sample BG-1DSample Date 7/11/2015Constituent (µg/L)As 2 Ba 370 Co 1.3 Cr 32.3 Hg 0.12 J+Mo 9.4 Pb 0.24 Ra-226 0.652 J+Ra-228 3.18 J+Sb 3.3 Se 2.1
Sample AB-3D
Sample Date 7/7/2015Constituent (µg/L)As 0.49 JBa190 Co 0.18 JCr51 Mo 34.5 Pb 0.44 J+Sb 0.22 JSe3.1 Tl 0.025 J
Sample GWA-6DSample Date 6/19/2015Constituent (µg/L)As 1 J+Ba 27 Co 0.3 J+Cr 24.8 Hg 0.071 J+Mo 7.6 Sb 0.25 JSe0.56
Sample AB-7D
Sample Date 7/1/2015Constituent (µg/L)As 2.2 Ba 41 Cr 24.7 Mo 8.5 J+Sb 7.5 Se 0.77
Sample GWA-5D
Sample Date 7/11/2015Constituent (µg/L)As 0.96 Ba 9.6 Co 0.21 JCr24.5 Mo 3 Pb 1.3
Sample AS-3D
Sample Date 6/5/2015Constituent (µg/L)As 0.97 Ba 21 Co 0.16 JCr23.5 Mo 22.1 Pb 0.094 JSb1.6 Se 0.66
Sample GWA-22DSample Date 7/10/2015Constituent (µg/L)As 0.91 Ba 61 Be 0.28 Co 3.4 Cr 174 Mo 7.1 Pb 1.2 Sb 1.4 Se 1.1
Sample GWA-23DSample Date 7/16/2015Constituent (µg/L)As 0.9 Ba 15 Cr 55 Mo 4.9 Se 0.4 J
Sample MW-8DSample Date 7/1/2015Constituent (µg/L)As 0.32 JBa43 Be 0.12 J+Co 1.1 Cr 4.1 Mo 2.3 J+Pb 0.73 J+Sb 0.21 J+
Sample AS-2D
Sample Date 6/8/2015Constituent (µg/L)As 0.66 Ba 50 Co 0.2 JCr22.5 Mo 10.5 Sb 1 J+Se 1.2
Sample GWA-20DSample Date 7/16/2015Constituent (µg/L)As 0.64 Ba 360 Cd 0.027 JCo1.9 Cr 186 Mo 71.8 Pb 1.1 Se 6.7 Tl 3.2
Sample MW-11DRSample Date 7/2/2015Constituent (µg/L)Ba 54 Be 0.071 JCr2.5 JMo0.14 JPb0.081 J+Sb 0.59 Se 0.72
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ASSESSMENT MONITORING CONSTITUENTS DETECTED IN BEDROCK WELLS (BRU AND BR)
GASTON COUNTY, NORTH CAROLINA
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DATE
FIGURE
AUGUST 2015
10-TBD
N
DUKE ENERGY CAROLINAS, LLCRIVERBEND STEAM STATION ASH BASIN
LEGEND
&<ASH BASIN ASSESSMENTGROUNDWATER MONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARYCOINCIDENT WITH DUKE ENERGYPROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
NOTES:U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMITJ = ESTIMATED CONCENTRATION<3.0 = LESS THAN THE LABORATORY REPORTING LIMITJ+ = ESTIMATED CONCENTRATION BIASED HIGHJ- = ESTIMATED CONCENTRATION BIASED LOW
µG/L: MICROGRAMS PER LITER
500 0 500 1,000
SCALE (FEET)
An alyte Abbreviat io nAntimonySbArsenicAsBariumBaBerylliumBeCadmiumCdChromiumCrCobaltCoLeadPbMercuryHgMolybdenumMoSeleniumSeThalliumTlRadium-226 Ra-226Radium-228 Ra-228
Sample GWA-2BRSample Date 6/17/2015Constituent (µg/L)As 1.3 Ba 7.7 Cr 7.4 Hg 0.15 J+Mo 5.9 Pb 0.048 JSb0.24 JSe1.2
Sample MW-15BRSample Date 6/23/2015Constituent (µg/L)As 0.78 Ba 23 Cr 4.9 Hg 0.088 J+Mo 8.2 Pb 0.066 JSb0.25 JSe0.57
Sample GWA-9BRSample Date 7/10/2015Constituent (µg/L)As 10.7 Ba 3.7 JCo0.75 Cr 40.6 Mo 47.3 Pb 0.84 Sb 4.5 Se 1.6
Sample GWA-7BRSample Date 7/7/2015Constituent (µg/L)As 0.29 JBa18 Cr 5.8 Mo 2.2 Pb 0.14 Sb 0.96 Se 0.3 J
Sample BG-2BRSample Date 7/17/2015Constituent (µg/L)As 0.28 JBa13 Co 0.82 Cr 2.3 Hg 0.79 J-Mo 12.8 Pb 0.35 Se 0.6
Sample AB-3BRSample Date 7/23/2015Constituent (µg/L)As 1.23 Ba 18 Co 1.64 Cr 8.27 Mo 5.66 Se 15.4
Sample MW-7BRSample Date 7/10/2015Constituent (µg/L)As 0.23 JBa340 Cr 24.7 Mo 13.3 Pb 0.21 Sb 0.86 Se 0.51 Tl 0.064 J+
Sample GWA-22BRSample Date 7/21/2015Constituent (µg/L)Ba 185 Cr 108 Mo 946 Se 4.39
Sample GWA-23BRSample Date 7/17/2015Constituent (µg/L)As 0.28 JBa130 Cr 15.6 Mo 5.2 Pb 0.31 Se 0.3 JTl0.077 J
Sample GWA-20BRSample Date 7/27/2015Constituent (µg/L)Ba 553 Cr 16.7 Mo 6.06
Sample GWA-4BRSample Date 7/27/2015Constituent (µg/L)Ba 383 Cr 38.1 Mo 18.2
Sample MW-9BRSample Date 7/2/2015Constituent (µg/L)As 0.69 Ba 21 Cr 4 JMo3.4 Pb 0.33 J+Sb 2.3 Se 0.22 JTl0.017 J
Sample AB-6BRU AB-6BRUSample Date 6/22/2015 7/2/2015Constituent (µg/L)As 0.24 J 0.75 Ba 5.6 38 Cd --0.026 JCo--1.8 Cr 2.4 J+8.1 Hg 0.085 J+--Mo 1.2 2.8 Pb --0.73 J+Sb 0.32 J 2.5 Se --0.27 J
Sample GWA-2BRUSample Date 7/10/2015Constituent (µg/L)As 0.36 JBa280 Co 0.81 Cr 46 Mo 60.1 Pb 0.81 Sb 18.2 Se 2.3 Tl 0.03 J
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1. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
2. AS -BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY.
3. SHALLOW MONITORING WELLS (S) - WELL SCREEN INSTALLED ACROSS THE SURFICIAL WATER TABLE.
4. DEEP MONITORING WELLS (D) - WELL SCREEN INSTALLED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCK AND THE REGOLITH.
5. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM NCDOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
6. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
7. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L .0107 (a).
8. PROPOSED WELL LOCATIONS ARE APPROXIMATE AND MAY BE ADJUSTED DUE TO FIELD CONDITIONS.
9. SEEP SAMPLING LOCATIONS WERE OBTAINED BY HDR USING A TRIMBLE HANDHELD GPS UNIT ON APRIL 29, 2014.
* INDICATES SEEP SAMPLING LOCATIONS WERE NOT RECORDED WITH GPS UNIT AND ARE APPROXIMATE.
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SURFACE WATER SAMPLE LOCATION
MAJOR FLOW TRANSECTS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION
GASTON COUNTY, NORTH CAROB NA
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E
N
E
R
G
Y

C
A
R
O
L
I
N
A
S
,

L
L
C

RI
V
E
R
B
E
N
D

S
T
E
A
M

S
T
A
T
I
O
N

GA
S
T
O
N

C
O
U
N
T
Y
,

N
O
R
T
H

C
A
R
O
L
I
N
A
SO
U
R
C
E
EX
P
O
S
U
R
E
ME
D
I
A
PR
I
M
A
R
Y
RE
L
E
A
S
E
ME
C
H
A
N
I
S
M
PR
I
M
A
R
Y
AF
F
E
C
T
E
D
ME
D
I
A
EX
P
O
S
U
R
E
RO
U
T
E
PRIMARY RECEPTOR Aquatic/Riparian

T
e
r
r
e
s
t
r
i
a
l
Co
a
l

A
s
h
Ba
s
i
n
In
f
i
l
t
r
a
t
i
o
n
Sp
r
i
n
g
s
/
S
e
e
p
s
Pr
e
c
i
p
i
t
a
t
i
o
n

&

D
i
s
s
o
l
u
t
i
o
n
So
i
l
(U
p
l
a
n
d

a
n
d

R
i
p
a
r
i
a
n
)
Gr
o
u
n
d
w
a
t
e
r
Po
t
e
n
t
i
a
l
l
y

C
o
m
p
l
e
t
e

E
x
p
o
s
u
r
e

P
a
t
h
w
a
y
In
c
o
m
p
l
e
t
e

o
r

I
n
s
i
g
n
i
f
i
c
a
n
t

P
a
t
h
w
a
y
A
q
u
a
t
i
c

B
i
o
t
a
Sediment Infauna Aquatic/Riparian Plants Piscivorous Wildlife Herbivorous Wildlife Omnivorous Wildlife Terrestrial Plants Terrestrial Invertebrates Herbivorous Wildlife Omnivorous Wildlife Carnivorous Wildlife
Ex
p
o
s
u
r
e

p
a
t
h
w
a
y
s

a
r
e

b
a
s
e
d

o
n

t
h
e

c
u
r
r
e
n
t

u
n
d
e
r
s
t
a
n
d
i
n
g

o
f

t
h
e

S
i
t
e

a
n
d

a
r
e

s
u
b
j
e
c
t

t
o

c
h
a
n
g
e
.
So
i
l
In
c
i
d
e
n
t
a
l

I
n
g
e
s
t
i
o
n
De
r
m
a
l

o
r

R
o
o
t

A
b
s
o
r
p
t
i
o
n
Te
r
r
e
s
t
r
i
a
l
In
v
e
r
t
e
b
r
a
t
e
s
In
g
e
s
t
i
o
n
Sm
a
l
l

M
a
m
m
a
l
s
an
d

B
i
r
d
s
In
g
e
s
t
i
o
n
Be
n
t
h
i
c

a
n
d
Aq
u
a
t
i
c

I
n
v
e
r
t
e
b
r
a
t
e
s
In
g
e
s
t
i
o
n
Se
d
i
m
e
n
t
In
c
i
d
e
n
t
a
l

I
n
g
e
s
t
i
o
n
De
r
m
a
l

o
r

R
o
o
t

A
b
s
o
r
p
t
i
o
n
Fi
s
h
In
g
e
s
t
i
o
n
Su
r
f
a
c
e

W
a
t
e
r
Se
d
i
m
e
n
t
Su
r
f
a
c
e

W
a
t
e
r
In
g
e
s
t
i
o
n

o
r

G
i
l
l

U
p
t
a
k
e
De
r
m
a
l

o
r

R
o
o
t

A
b
s
o
r
p
t
i
o
n
Aq
u
a
t
i
c
/
R
i
p
a
r
i
a
n
Pl
a
n
t
s
In
g
e
s
t
i
o
n
Ve
g
e
t
a
t
i
o
n
In
g
e
s
t
i
o
n
Le
g
e
n
d
:

No
t
e
:

NP
D
E
S
Di
s
c
h
a
r
g
e