NC0038377_Figure 10-5 to 10-52 - Isoconcentration Maps_20150902

N---------------� •�---------------------
A •
S-012
Flu
< 1 (<
<1 (21)
AEIMW-04'
�.,<1 (<1)
j
♦............. -.- r-..-1
A
1981W. LANDFILL s.
MAYO
LAKE
,
. ,-..
l .
LEGEND
1 N N NV h X
1 BOLD VALUESN N N
(1) N N IW hX
(1) BOLD VALUESN N N
N N N ITV N N
W N N N N N N
N
0 N
O N N N
N N N
N N N N N N
NOTES:
N
N N
N hhi nr N
N g
N
N N
N Idi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N hhi nrN
N g
N
N
N
N
IW M N N Nn
hg
N
N
N N N
hit )hi npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g BK
w
N N
N
N NN
N
N N N N
N
N
Nni i IW
vohti"
N
pi i pii vii ranii nuii ndii
WN X
tip DUKE
ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnnawmw N N Ntrtp w
9 9
FIGURE 10-5
ISOCONCENTRATION MAP
ANTIMONY IN ASH PORE WATER WELLS

N---------------� ••------------
h
• �J
A / r • ?
�S-012
3.45(2.06)
p
-• - wcrnio �_s� d
A
ABMW-01a 10.
g� V' 518 (369) ABMW-02a
biik
1020(87a)-03'�97)
I
L.
♦................ r-.. -1
Lam.
MAYO
LAKE
,
iLEGEND
10 N N frYV h X
10 BOLD VALUESN N N
(10) N N RV X
(10) BOLD VALUESN N N
N hh N fW N N
W N N N N N N
N
L N
O N N N
N N N
N N N N N N
1.
ti r ♦'� /
J -
X
X
NOTES:
N
N N
N hhi nr N N g
N
N N
N fdi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N hhi nrN N g
N
N
hh N N
N hhN h g
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g fX
w
N N
N
N NN
N N N N N
N
N
fdni i IVV
voh"
N
pi i pii vii ranii nuii ndii
WN X
1�lp
synTerra
rrpvN N N Nni c
IN NMI m
vspEpnmm~
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
ni ssi N N <
N N Ntrtp
FIGURE 10-6
ISOCONCENTRATION MAP
ARSENIC IN ASH PORE WATER WELLS

N---------------� ••----------
o ..
A • •J -
S-012.�-
�142(131) -�-'�-
S-022
ABMW-04
(449)
9r1
j
♦. — .. — .. — ..... — .. r_ .. —1
MAYO
LAKE
,
1•
A"�
`-1
1
LEGEND
700 N N NV h X
700 BOLD VALUESN N N
(700) N N IW h X
(700) BOLD VALUESN N N
N N N Kry N N
W N N N N N N
N
0 N
O N N N
N N N
N N N N N N
NOTES:
N
N N
N hhi nr N N g
N
N N
N Idi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N hhi nrN N g
N
N
hhN N
NNiiNhg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
Idni i IW
voh"
N
pi i pii vii ranii nuii ndii
WN Xtip =
DUKE
a
ENERGY
s mTerra PROGRESS
rrpvN N N Nni c N N N N
a
IN NMI m ni ssi N N
vspEpnnawmw N N Ntrtp LL
9 9 a
FIGURE 10-7
ISOCONCENTRATION MAP
BARIUM IN ASH PORE WATER WELLS

N---------------� •�---------------------
A •
ABMW-01'
g� 4560 (4530)
goo
ABMW-02'
9200 (8100)
J
j
.. -..... -..... -.. r_..-1
A
MAYO
LAKE
,
LEGEND
700 N N NV h X
700 BOLD VALUESN N N
(700) N N RV h X
(700) BOLD VALUESN N N
N hh N Kry N N
N
0 N
O N N N
N N N
�... mz
N N N N N N
NOTES:
N
N N
N hhi nr N N g
N
N N
N fdi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N hhi nrN N g
N
N
hhN N
NNiiN hg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
hhni i IW
voh"
N
pi i pii vii ranii nuii ndii
WN X
DUKE
1�lp ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p W
9 9
FIGURE 10-8
ISOCONCENTRATION MAP
BORON IN ASH PORE WATER WELLS

N---------------� •a------------
h ,
• '• �J
a
L
♦. - .. - .. - ..... - ..
LEGEND
0.035 N NV m IW h X
0.035 BOLD VALUESN N N
-• ' c W.i "e ., T
N NV N N X
W N N N N N N
N
�- N N N
�._._ N N N
N N N N N N
I —
MAYO
LAKE
,
1•
_`Ils`
1 -
X
NOTES:
m
N
N N
N fdi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N fdi nr N
N g
N
N
N
N N
NVMNgorN hJW c
ni nrX
N
N
N N N
Nt Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g hX
w
N N
N
N NN
N
N N N N
N
N
fdni i IW
vohti"
N
pi i pii vii rrmii nuii ndii
WN X
DUKE
All ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-9
ISOCONCENTRATION MAP
CHROMIUM (VI) IN ASH PORE WATER WELLS

N---------------� •�---------------------
A •
S-01Z
n 8.05 Q.n)
AB M W-03'
j
♦. — ..... — ..... — . . r_ .. —1
J vrm.
1•
A"�
`-1
1
LEGEND
1 N N NV h X
1 BOLD VALUESN N N
(1) N N NV hX
(1) BOLD VALUESN N N
N N N NV N N
W N N N N N N
N
0 N
O N N N
N N N
N N N N N N
NOTES:
N
N N
N hhi nr N
N g
N
N N
N Idi nrN
N g
^
N
N N
N Ni nrN
N 9
p
N
N N
N hhi nrN
N 9
N
N
N
N
IW )N N N NN h g
N
N
N N N
Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N
N N N 9
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
VN 0
g
g Bx
w
N N
N
N NN
N
N N N N
N
N
Idni i IW
voh"
N
pi i 31i vii ranii nuii ndii
WN Xtip =
DUKE
a
ENERGY
s mTerra PROGRESS
rrpvN N N Nni c N N N N
a
IN NMI m ni ssi N N
vspEpnnawmw N N Ntrtp LL
9 9 a
FIGURE 10-10
ISOCONCENTRATION MAP
COBALT IN ASH PORE WATER WELLS

N---------------� •a------------
h
• �J
, a ,
slo1Z �J ,
• 22000 (15100)
ASH BASIN i
1981 � ♦W.
LANDFILL s.
ABMW-013 All I00"
1370 (483) ABMW-02' -356(172,
1
aoo
AB W 03�3'Ali Lou
,
Lam.
' MAYO
LAKE
j
.. —..... —..... —.. r_..-1
LEGEND
300 N N f+YV h X
300 BOLD VALUESN N N
(300) N N IW h X
(300) BOLD VALUESN N N
N N N IW N N
W N N N N N N
N
0 N
O N N N
N N N
N N N N N N
NOTES:
N
N N
N hhi nr N
N g
N
N N
N Idi nrN
N g
^
N
N N
N Ni nrN
N g
p
N
N N
N Ni nrN
N g
N
N
N N N
N Idii N h g
N
N
N N N
Ntddi npJpJ N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N 9
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
VN 0
g
g fX
w
N N
N
N NN
N
N N N N
N
N
Nni i IW
voh"
N
pi i pii vii ranii nuii ndii
WN X
DUKE
Alp ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnnawmw N N Ntrtp w
9 9
FIGURE 10-11
ISOCONCENTRATION MAP
IRON IN ASH PORE WATER WELLS

N---------------� •�---------------------
A •
�, 50
ABMW-02'
o 1 1110 (957)
ABMW-03'�
j
L.
.. —..... —..... —.. r_..-1
-4
.•�-
Ali.
v
Lam.
MAYO
LAKE
1•
Its
•1
1 -
iLEGEND
50 N N fW h X
50 BOLD VALUESN N N
(50) N N hl'V h X
(50) BOLD VALUESN N N
r N hh N Kry N N
N
L N
O N N N
N N N
N N N N N N
NOTES:
N
N N
N hhi nr N N g
N
N N
N fdi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N hhi nrN N g
N
N
hh N N
N NiN hg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
fdni i IW
voh"
N
pi i pii vii ranii nuii ndii
WN X =
DUKE
All a
ENERGY
symTerra PROGRESS
rrpvN N N Nni c N N N N
a
IN NMI m ni ssi N N
vspEpnmm~ N N Nt rt p LL
9 9 a
FIGURE 10-12
ISOCONCENTRATION MAP
MANGANESE IN ASH PORE WATER WELLS

N---------------� •a------------
h .
• �J
• m
a
j
1
.--------------- ---1
LEGEND
6.5-8.5 TOTAL pH CONCENTRATION (S.U.)
6.5-8.5 BOLD VALUES INDICATE AN EXCEEDANCES
NORTH CAROLINA2L CONTOUR (DASHED WHERE ESTIMATED)
(HASH MARKS INDICATE DIRECTION OF EXCEEDANCES)
MONITORING WELL
-
0
TOE DRAIN
Q
ACTIVE ASH BASIN BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
DUKE ENERGY PROGRESS MAYO PLANT SITE BOUNDARY
.-
STREAM
LAKE
1•
4
NOTES:
1 CONCENTRATIONS ARE FROM THE MARCH 2O15 SAMPLING EVENT.
2 CONCENTRATIONS ARE FROM THE MAY 2015 SAMPLING EVENT.
3 CONCENTRATIONS ARE FROM THE JUNE 2015 SAMPLING EVENT.
4 CONCENTRATIONS ARE FROM THE JULY 2015 SAMPLING EVENT.
5 THE NORTH CAROLINA 2L RANGE FOR pH IS 6.5 TO 8.5 S.U..
6 SITE AERIAL ORTHOPHOTOGRAPHY IS DATED APRIL 17, 2014. IT WAS OBTAINED
FROM WSP.
7 ADDITIONAL OFFSITE AERIAL ORTHOPHOTOGRAPHY IS DATED 2012. IT WAS
OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS.
(http://services.nconemap.gov/)
8 PARCEL BOUNDARY WAS OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC
INFORMATION AND ANALYSIS. (hftp://services.nconemap.gov/)
9 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD8312011).
GRAPHIC SCALE
400 0 400 800 1,200 1,600 2,000
(IN FEET)
1�lp
symTerra
148 RIVER STREET, SUITE 220,
GREENVILLE, SC 29601
864-421-9999
www.synterracorp.com
�� DUKE
ENERGY
PROGRESS
MAYO STEAM ELECTRIC POWER PLANT
10660 BOSTON RD
ROXBORO, NORTH CAROLINA 27574
FIGURE 10-13
ISOCONCENTRATION MAP
pH IN ASH PORE WATER WELLS

N---------------� ••------------
o ..
A • •J -
W02(-1:0.2)
S-022
it
.. -.. -.. -..... -.. r_..-1
L.
4SIN i
1981
LANDFILL s.
MW-03'-� •'
Ira , Ali .. �.s;:..
Lam.
MAYO
LAKE
LEGEND
0.2 N N fW h X
0.2 BOLD VALUESN N N
(0.2) N N IW h X
(0.2) BOLD VALUESN N N
N N N IW N N
W N N N N N N
N
0 N
O N N N
-� N N N
N N N N N N
NOTES:
N
N N
N hhi nr N
N g
N
N N
N Idi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N Ni nrN
N g
N
N
N
N
RVM N N N gt
hg
N
N
N N N
Nt Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g fX
w
N N
N
N NN
N
N N N N
N
N
Nni i IW
vohti"
N
pi i pii vii ranii nuii ndii
WN X
DUKE
All ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-14
ISOCONCENTRATION MAP
THALLIUM IN ASH PORE WATER WELLS

N--------------- ••---------------------
A • '
ff
s"
LEGEND
500 TOTAL DISSOLVED SOLIDS CONCENTRATION (mg/L)
500 BOLD VALUES INDICATE AN EXCEEDANCE5
NORTH CAROLINA2L CONTOUR (DASHED WHERE ESTIMATED)
(HASH MARKS INDICATE DIRECTION OF LOWER CONCENTRATIONS)
MONITORING WELL
-
0 TOE DRAIN
Q ACTIVE ASH BASIN BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
DUKE ENERGY PROGRESS MAYO PLANT SITE BOUNDARY
.-
STREAM
MAYO
LAKE
•
z,4
1•
s .J
:.r
1
NOTES:
1 CONCENTRATIONS ARE FROM THE MARCH 2O15 SAMPLING EVENT.
2 CONCENTRATIONS ARE FROM THE MAY 2015 SAMPLING EVENT.
3 CONCENTRATIONS ARE FROM THE JUNE 2015 SAMPLING EVENT.
4 CONCENTRATIONS ARE FROM THE JULY 2015 SAMPLING EVENT.
5 THE NORTH CAROLINA2L FOR TOTAL DISSOLVED SOLIDS IS 500 mg/L.
6 SITE AERIAL ORTHOPHOTOGRAPHY IS DATED APRIL 17, 2014. IT WAS OBTAINED
FROM WSP.
7 ADDITIONAL OFFSITE AERIAL ORTHOPHOTOGRAPHY IS DATED 2012. IT WAS
OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS.
(http://services.nconemap.gov/)
8 PARCEL BOUNDARY WAS OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC
INFORMATION AND ANALYSIS. (hftp://services.nconemap.gov/)
9 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD8312011).
GRAPHIC SCALE
400 0 400 800 1,200 1,600 2,000
(IN FEET)
1�lp
symTerra
148 RIVER STREET, SUITE 220,
GREENVILLE, SC 29601
864-421-9999
www.synterracorp.com
�� DUKE
ENERGY
PROGRESS
MAYO STEAM ELECTRIC POWER PLANT
10660 BOSTON RD
ROXBORO, NORTH CAROLINA 27574
FIGURE 10.15
ISOCONCENTRATION MAP
TOTAL DISSOLVED SOLIDS IN ASH PORE
WATER WELLS

N---------------� ••------------
h ,
• �J
n 0.45(<0.3) R��1 ..�--�''_-•
S-022
i'
AE
31
A
ABMW-02' .�
�3.53 (2.59)
h-ft<
W-03'0.3)
J
j
.. —.. —.. —..... —.. r_..-1
Lam.
MAYO
LAKE
� / s
1•
A"�
`-1
1
LEGEND
0.3 N N NV h X
0.3 BOLD VALUESN N N
(0.3) N N KV h X
(0.3) BOLD VALUESN N N
N N N tW N N
W N N N N N N
� N
0 N
O N N N
N N N
N N N N N N
NOTES:
N
N N
N hhi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N hhi nrN
N g
N
N
N
N
RV M N N Ng)
hg
N
N
N N N
hit Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g BK
w
N N
N
N NN
N
N N N N
N
N
fdni i IW
vohti"
N
pi i pii vii ranii nuii ndii
WN X =
DUKE
All a
ENERGY
symTerra PROGRESS
rrpvN N N Nni c N N N N
a
IN NMI m ni ssi N N
vspEpnnawmw N N Ntrtp LL
9 9 a
FIGURE 10-16
ISOCONCENTRATION MAP
VANADIUM IN ASH PORE WATER WELLS

N---------------�
A •
h •
•
J '
r
• MWP16S'
• • <1 (<1)
j
_ MW-12S'
♦.—.....1 <1.....—..�..� �
MAYO
LAKE
LEGEND
1 N N tW h X
1 BOLD VALUESN N N
(1) N N fW hX
(1) BOLD VALUESN N N
N N N tW N N
W N N N N N N
N
N N N
�._._ N N N
N N N N N N
I —
NOTES:
m
N
N N
N fdi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N fdi nr N
N g
N
N
N
N
tW M N N Nn
hg
N
N
N N N
Nt ddi npp N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g hX
w
N N
N
N NN
N
N N N N
N
N
fdni i IW
vohti"
N
pi i pii vii ranii nuii ndii
WN X
1�lp
synTerra
rrpvN N N Nni c
IN NMI m
vspEpnm""
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
ni ssi N N <
N N Ntrtp
FIGURE 10-17
ISOCONCENTRATION MAP
ANTIMONY IN SURFICIAL WELLS

N---------------�
A •
h
•
J '
r
• MWP16S'
• • <1 (<1)
j
_ MW-12S'
•.—.....1 <1.....—..�..� �
LEGEND
10 N N fW h X
10 BOLD VALUESN N N
(10) N N RV h X
(10) BOLD VALUESN N N
N fd N fW N N
W N N N N N N
•�- N N N
�._._ N N N
N N N N N N
I —
Lam.. � •
MAYO
LAKE
,
J
X
X
NOTES:
m
N
N N
N fdi nr N N g
N
N N
N fdi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N fdi nr N N g
N
N
fd N N
N hh N h g
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N fdi nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VV 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
fdni i IW
voh"
N
pi i 31i vii rrmii nbii ndii
WN X
1�lp
synTerra
rrpvN N N Nni c
IN NMI m
vspEpnm""
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
ni ssi N N <
N N Ntrtp
FIGURE 10-18
ISOCONCENTRATION MAP
ARSENIC IN SURFICIAL WELLS

N---------------�
A ,
h •
•
• MWP16S'
• . 46 (46)
j
_ MW-12S'
24 (23)
♦.—...... ...�..
L
MAYO
LAKE
,
LEGEND
700 N N NV h X
700 BOLD VALUESN N N
(700) N N IW h X
(700) BOLD VALUESN N N
N fd N fW N N
W N N N N N N
N
N N N
�._._ N N N
N N N N N N
I —
X
X
NOTES:
m
N
N N
N fdi nr N N g
N
N N
N fdi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N fdi nr N N g
N
N
fdN N
NNiiNhg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N fdi rm pJ N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
fdni i IW
voh"
N
pi i pii vii nmii nbii ndii
WN X
1�lp
synTerra
rrpvN N N Nni c
IN NMI m
vspEpnm""
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
ni ssi N N <
N N Ntrtp
FIGURE 10-19
ISOCONCENTRATION MAP
BARIUM IN SURFICIAL WELLS

N---------------� ••---------------------
A , '
♦
/ 4
♦ _ MWP16S'
/ ♦ ♦ < 50 (< 50)
' SR.1501`,' '.
MW-03'
847 (815) - —
�00 _ a • '
•• ACTIVE - � - - - -
ASH BASIN '
ABMW-03S' ,
1100 (1070)
1
L
MW-12S'
<.5� 050)
i
,l
MAYO
LAKE
♦
$
. A
`
J
LEGEND
700 N N NV h X
700 BOLD VALUESN N N
(700) N N RV h X
(700) BOLD VALUESN N N
N Id N fW N N
W N N N N N N
N
N N N
�._._ N N N
N N N N N N
X
X
NOTES:
N
N N
N fdi nr N N g
N
N N
N Idi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N Idi nrN N g
N
N
IdN N
NNiiN hg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N Idi rm pJ N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
Idni i IW
voh"
N
pi i pii vii ranii nuii ndii
WN X
1�lp
synTerra
rrpvN N N Nni c
IN NMI m
vspEpnmm~
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
m ssi N N <
N N Ntrtp
FIGURE 10-20
ISOCONCENTRATION MAP
BORON IN SURFICIAL WELLS

N--------------- •�---------------------
A •
• SR:l—
j
.. -.. -.. -..... -.. r_..-1
4
MWP16S'
0.011
LEGEND
0.035 N NV m
0.035 BOLD VALUESN N N
N NV
W N N
•�• � N
•�- N N N
�-• U._._ � N N
N N
I —
Lam.. � •
MAYO
LAKE
,
J
IW h X
N
N
X
N
N
N
N X
N
N
N
N
N
NOTES:
m
N
N N
N fdi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N fdi nr N
N g
N
N
N
N N
NVMNgorN hJW c
ni nrX
N
N
N N N
Nt Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g hX
w
N N
N
N NN
N
N N N N
N
N
fdni i IW
vohti"
N
pi i 31i vii rrmii nuii ndii
WN X
1�lp
symTerra
rrpvN N N Nni c
IN NMI m
vspEpnm""
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
ni ssi N N <
N N Ntrtp
FIGURE 10-21
ISOCONCENTRATION MAP
CHROMIUM (VI) IN SURFICIAL WELLS

�Il
N---------------� •�---------------------
Flu
L
31
♦
FILL s.
f-,
``�.
Lam.
MAYO
LAKE
,
LEGEND
1 N N NV h X
1 BOLD VALUESN N N
(1) N N NV hX
(1) BOLD VALUESN N N
N N N NV N N
W N N N N N N
N
N N N
�._._ N N N
N N N N N N
I —
NOTES:
N
N N
N hhi nr N
N g
N
N N
N Idi nrN
N g
^
N
N N
N Ni nr N
N 9
p
N
N N
N hhi nrN
N 9
N
N
N
N
IW )N N N NrN h g
N
N
N N N
Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N
N N N 9
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
VN 0
g
g Bx
w
N N
N
N NN
N
N N N N
N
N
Idni i IW
voh"
N
pi i pii vii ranii nuii ndii
WN X
DUKE
All ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-22
ISOCONCENTRATION MAP
COBALT IN SURFICIAL WELLS

N---------------� ••---------------------
n • �y •
•
� • MW-16S3
L
_ MW-12S'
295 (< 10)
�.. ......
FW
MAYO
LAKE
J
LEGEND
300 N N fW h X
300 BOLD VALUESN N N
(300) N N RV h X
(300) BOLD VALUESN N N
N fd N fW N N
� W N N N N N N
N
N N N
�._._ N N N
N N N N N N
I —
X
X
NOTES:
m
N
N N
N fdi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
p
N
N N
N fdi nr N
N g
N
N
fd N N
N fdi i N h g
N
N
N N N
Ntddi npJpJ N N
N
g
r
N
N
N
N N fdi rm pJ N
N N
N
N N
N
N N N 9
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
VV 0
g
g Bx
w
N N
N
N NN
N
N N N N
N
N
fdni i IW
voh"
N
pi i 31i vii rrmii nbii ndii
WN X
1�lp
synTerra
rrpvN N N Nni c
IN NMI m
vspEpnmm~
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
ni ssi N N <
N N Ntrtp
FIGURE 10-23
ISOCONCENTRATION MAP
IRON IN SURFICIAL WELLS

N---------------� ••---------------------
n • �y •
•
� • MW-16S3
L
MW-12S3
267 (249)
LEGEND
50 N N fW h X
50 BOLD VALUESN N N
(50) N N hl'r/ h X
(50) BOLD VALUESN N N
N fd N fW N N
W N N N N N N
•�� � N
•�- N N N
�._._ N N N
N N N N N N
I —
MAYO
LAKE
,
J
1
X
X
NOTES:
m
N
N N
N fdi nr N N g
N
N N
N fdi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N fdi nr N N g
N
N
fd N N
N NiN hg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N fdi nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
fdni i IW
voh"
N
pi i 31i vii rrmii nbii ndii
WN X
1�lp
synTerra
rrpvN N N Nni c
IN NMI m
vspEpnm""
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
ni ssi N N <
N N Ntrtp
FIGURE 10-24
ISOCONCENTRATION MAP
MANGANESE IN SURFICIAL WELLS

N--------------- •�---------------------
A • '
Ao•
- I..;&Mu
94'
j
_ MW-12S3
5.7
L
17
Flu
1
1•
4
LEGEND
6.5-8.5 TOTAL pH CONCENTRATION (S.U.)
6.5-8.5 BOLD VALUES INDICATE AN EXCEEDANCE5
NORTH CAROLINA2L CONTOUR (DASHED WHERE ESTIMATED)
(HASH MARKS INDICATE DIRECTION OF EXCEEDANCES)
MONITORING WELL
ACTIVE ASH BASIN BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
�^
DUKE ENERGY PROGRESS MAYO PLANT SITE BOUNDARY
—
STREAM
NOTES:
CONCENTRATIONS ARE FROM THE MARCH 2O15 SAMPLING EVENT.
s CONCENTRATIONS ARE FROM THE MAY 2015 SAMPLING EVENT.
3 CONCENTRATIONS ARE FROM THE JUNE 2015 SAMPLING EVENT.
4 CONCENTRATIONS ARE FROM THE JULY 2015 SAMPLING EVENT.
5 THE NORTH CAROLINA 2L RANGE FOR pH IS 6.5 TO 8.5 S.U..
6 SITE AERIAL ORTHOPHOTOGRAPHY IS DATED APRIL 17, 2014. IT WAS OBTAINED
FROM WSP.
7 ADDITIONAL OFFSITE AERIAL ORTHOPHOTOGRAPHY IS DATED 2012. IT WAS
OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS.
(http://services.nconemap.gov/)
8 PARCEL BOUNDARY WAS OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC
INFORMATION AND ANALYSIS. (hftp://services.nconemap.gov/)
9 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD8312011).
GRAPHIC SCALE
400 0 400 800 1,200 1,600 2,000
(IN FEET)
1�lp
symTerra
148 RIVER STREET, SUITE 220,
GREENVILLE, SC 29601
864-421-9999
www.synterracorp.com
�� DUKE
ENERGY
PROGRESS
MAYO STEAM ELECTRIC POWER PLANT
10660 BOSTON RD
ROXBORO, NORTH CAROLINA 27574
FIGURE 10-25
ISOCONCENTRATION MAP
pH IN SURFICIAL WELLS

N---------------�
A •
h •
•
J '
r
• MWP16S'
• • < 0.2 (< 0.2)
_ MW-12S'
< 0.2 (< 0.2)
♦.—...... ......
L
MAYO
LAKE
,
1
LEGEND
0.2 N N fW h X
0.2 BOLD VALUESN N N
(0.2) N N fW h X
(0.2) BOLD VALUESN N N
N N N fW N N
W N N N N N N
N
N N N
�._._ N N N
N N N N N N
I —
NOTES:
m
N
N N
N fdi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nr N
N g
o
N
N N
N fdi nr N
N g
N
N
N
N
RVM N N Ngt
hg
N
N
N N N
fdt ddi npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g fX
w
N N
N
N NN
N
N N N N
N
N
Idni i IVr/
vohti"
N
pi i pii vii ranii nuii ndii
WN X
1�lp
synTerra
rrpvN N N Nni c
IN NMI m
vspEpnm""
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
ni ssi N N <
N N Ntrtp
FIGURE 10-26
ISOCONCENTRATION MAP
THALLIUM IN SURFICIAL WELLS

N--------------:%
A /
h •
•
J '
r
• MWP16S'
• • 100
_ MW-12S'
50 .-- -- — -..�..,
li
LEGEND
500 TOTAL DISSOLVED SOLIDS CONCENTRATION (mg/L)
500 BOLD VALUES INDICATE AN EXCEEDANCE5
NORTH CAROLINA2L CONTOUR (DASHED WHERE ESTIMATED)
(HASH MARKS INDICATE DIRECTION OF LOWER CONCENTRATIONS)
•
MONITORING WELL
• • -
ACTIVE ASH BASIN BOUNDARY
. _ . _ ASH BASIN COMPLIANCE BOUNDARY
�^ DUKE ENERGY PROGRESS MAYO PLANT SITE BOUNDARY
- STREAM
MAYO
LAKE
,
1
R
OPT
1•
' J
s
•J
:.r
NOTES:
1 CONCENTRATIONS ARE FROM THE MARCH 2O15 SAMPLING EVENT.
2 CONCENTRATIONS ARE FROM THE MAY 2015 SAMPLING EVENT.
3 CONCENTRATIONS ARE FROM THE JUNE 2015 SAMPLING EVENT.
4 CONCENTRATIONS ARE FROM THE JULY 2015 SAMPLING EVENT.
5 THE NORTH CAROLINA2L FOR TOTAL DISSOLVED SOLIDS IS 500 mg/L.
6 SITE AERIAL ORTHOPHOTOGRAPHY IS DATED APRIL 17, 2014. IT WAS OBTAINED
FROM WSP.
7 ADDITIONAL OFFSITE AERIAL ORTHOPHOTOGRAPHY IS DATED 2012. IT WAS
OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS.
(http://services.nconemap.gov/)
8 PARCEL BOUNDARY WAS OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC
INFORMATION AND ANALYSIS. (hftp://services.nconemap.gov/)
9 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD8312011).
GRAPHIC SCALE
400 0 400 800 1,200 1,600 2,000
(IN FEET)
1�lp
symTerra
148 RIVER STREET, SUITE 220,
GREENVILLE, SC 29601
864-421-9999
www.synterracorp.com
�� DUKE
ENERGY
PROGRESS
MAYO STEAM ELECTRIC POWER PLANT
10660 BOSTON RD
ROXBORO, NORTH CAROLINA 27574
FIGURE 10.27
ISOCONCENTRATION MAP
TOTAL DISSOLVED SOLIDS IN SURFICIAL
WELLS

N---------------� ••---------------------
n • �y
\\ • i
•
I
L
•,1
Lam.. � •
MAYO
LAKE
,
J
1•
A"�
`-1
LEGEND
0.3 N N NV h X
0.3 BOLD VALUESN N N
(0.3) N N KV h X
(0.3) BOLD VALUESN N N
N N N tW N N
W N N N N N N
•�� N
N N N
U-_-_ N N N
N N N N N N
I —
NOTES:
m
N
N N
N fdi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N fdi nr N
N g
N
N
N
N
RV M N N Ng)
hg
N
N
N N N
Nt Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g BK
w
N N
N
N NN
N
N N N N
N
N
fdni i IW
vohti"
N
pi i 31i vii ranii nuii ndii
WN X =
DUKE
Alp a
ENERGY
s mTerra PROGRESS
rrpvN N N Nni c N N N N
a
IN NMI m ni ssi N N
vspEpnnawmw N N Ntrtp c
9 9 a
FIGURE 10-28
ISOCONCENTRATION MAP
VANADIUM IN SURFICIAL WELLS

N---------------�
A
•
0
h
J
. . . . . . .... .
L
it
1•
A- Ala
> .J
LEGEND
1 N N NV h X
1 BOLD VALUESN N N
(1) N N KV hX
(1) BOLD VALUESN N N
N N N NV N N
W N N N N N N
N
N N N
U-_-_ N N N
N N N N N N
I -
NOTES:
m
N
N N
N fdi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N fdi nr N
N g
N
N
N
N
RV M N N Nn
hg
N
N
N N N
Nt Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g BK
w
N N
N
N NN
N
N N N N
N
N
fdni i IW
vohti"
N
pi i pii vii ranii nuii ndii
WN X
tip DUKE
ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-29
ISOCONCENTRATION MAP
ANTIMONY IN TRANSITION ZONE WELLS

N---------------� ••--------
• �y
* ON
A •
• ,
j
L.
_ MW-12D'
1(C1)
�.—.....—...... ,
LEGEND
10 N N IW h X
10 BOLD VALUESN N N
(10) N N fW h X
MW-16D' (10) BOLD VALUESN N N
N N N IW N N
W N N N N N N
+a.. N
'•� •�- N N N
'4 - N N N
< I (Ns) - -�� �^ N N N N N N
x
1981 � ♦
LANDFILL . _ •
CW-01"
< 1 (NS)
��•�'00,
MAYO
LAKE
NOTES:
N
N N
N hhi nr N N g
N
N N
N Idi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N Ni nrN N g
N
N
N N N
N hhN h g
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g fX
w
N N
N
N NN
N N N N N
N
N
Nni i IW
voh"
N
pi i pii vii ranii nuii ndii
WN X =
DUKE
1�lp a
ENERGY
s mTerra PROGRESS
rrpvN N N Nni c N N N N
a
IN NMI m ni ssi N N
vspEpnnawmw N N Ntrtp LL
9 9 a
FIGURE 10-30
ISOCONCENTRATION MAP
ARSENIC IN TRANSITION ZONE WELLS

N------ ---------� h
A• Jy
i'
iri
MW-02 Wet 711171'-
55(53)
7
cw-021
129 (NS)
L.
MW-12D'
26 (23)
�.—...... ..�.., 1►
Flu
24(23)-----
1981 � ♦
LANDFILL s•. '
CW-014
< 5 (NS)
MAYO
LAKE
Ilk
LEGEND
700 N N NV h X
700 BOLD VALUESN N N
(700) N N IW h X
(700) BOLD VALUESN N N
N N N fW N N
W N N N N N N
N
N N N
�._._ N N N
N N N N N N
I —
NOTES:
N
N N
N hhi nr N N g
N
N N
N Idi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N hhi nrN N g
N
N
hhN N
NNiiNhg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi rm pJ N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
Nni i IW
voh"
N
pi i pii vii ranii nuii ndii
WN XLl
=
DUKE
All a
ENERGY
symTerra PROGRESS
rrpvN N N Nni c N N N N
a
IN NMI m ni ssi N N
vspEpnmm~ N N Nt rt p LL
9 9 a
FIGURE 10-31
ISOCONCENTRATION MAP
BARIUM IN TRANSITION ZONE WELLS

N---------------�
A
MW-12D'
<50(<50)
♦.—...... ......
L
i)
7
it
1•
A— Ala
s .J
`-1
1
LEGEND
700 N N NV h X
700 BOLD VALUESN N N
(700) N N RV h X
(700) BOLD VALUESN N N
N fd N fW N N
W N N N N N N
N
N N N
�._._ N N N
N N N N N N
I —
NOTES:
m
N
N N
N fdi nr N N g
N
N N
N fdi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N fdi nr N N g
N
N
fdN N
NNiiN hg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N fdi rm pJ N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
Nni i IW
voh"
N
pi i pii vii rrmii nbii ndii
WN X
DUKE
All ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-32
ISOCONCENTRATION MAP
BORON IN TRANSITION ZONE WELLS

N---------------�
A •
♦
MW-12D'
/ 0.334
j
L.
MW 16D'
/ 0.051
LEGEND
0.035 N NV m
0.035 BOLD VALUESN N N
N NV
W N N
•�� � N
•�- N N N
�._._ N N
��— N N
I —
' MAYO
LAKE
IW h X
N
N
X
N
N
N
N X
N
N
N
N
N
NOTES:
m
N
N N
N fdi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N fdi nr N
N g
N
N
N
N N
NVMNgorN hJW c
ni nrX
N
N
N N N
Nt Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g hX
w
N N
N
N NN
N
N N N N
N
N
fdni i IVr/
vohti"
N
pi i pii vii ranii nuii ndii
WN X
1�lp
symTerra
rrpvN N N Nni c
IN NMI m
vspEpnmm~
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
ni ssi N N <
N N Ntrtp
FIGURE 10-33
ISOCONCENTRATION MAP
CHROMIUM (VI) IN TRANSITION ZONE WELLS

N---------------�
A -
• I
h •
•
J '
r
CW-031
r - < 1 (NS)
MW-02'
a4
MW-12D' /
LEGEND
1 N N NV h X
1 BOLD VALUESN N N
(1) N N NV hX
_ MW-'16D' (1) BOLD VALUESN N N
<1 (<1) N N N NV N N
W N N N N N N
•�� � N
•�� � N N N
SS)-��..�- N N N N N N
;�• I -
a'
ACTIVE -
ASH BASIN '
1981 � ♦
will -e
LANDFILL s.. '
J,
CW-014
< 1 (NS) '
,
c`
9 ♦
MAYO
LAKE
,
j
Ilk
NOTES:
N
N N
N hhi nr N
N g
N
N N
N Idi nrN
N g
^
N
N N
N Ni nrN
N 9
p
N
N N
N hhi nrN
N 9
N
N
N
N
IW )N N N NrN h g
N
N
N N N
Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N
N N N 9
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
VN 0
g
g Bx
w
N N
N
N NN
N
N N N N
N
N
Idni i IW
voh"
N
pi i pii vii ranii nuii ndii
WN X =
DUKE
All a
ENERGY
symTerra PROGRESS
rrpvN N N Nni c N N N N
a
IN NMI m ni ssi N N
vspEpnnawmw N N Ntrtp LL
9 9 a
FIGURE 10-34
ISOCONCENTRATION MAP
COBALT IN TRANSITION ZONE WELLS

N---------------� ••---------------------
A /y i
r
L
MAYO
LAKE
,
'
1•
A"�
4
`-1
1
LEGEND
300 N N W h X
300 BOLD VALUESN N N
(300) N N RV h X
(300) BOLD VALUESN N N
N htt N Kry N N
� W N N N N N N
•�� � N
N N N
�._._ N N N
N N N N N N
I —
NOTES:
m
N
N N
N hhi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
p
N
N N
N hhi nrN
N g
N
N
hh N N
N hbi i N h g
N
N
N N N
Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N
N N N 9
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
VN 0
g
g Bx
w
N N
N
N NN
N
N N N N
N
N
fdni i IW
voh"
N
pi i pii vii rrmii nbii ndii
WN X =
DUKE
All a
ENERGY
symTerra PROGRESS
rrpvN N (N Mni c N N N N
a
(N Nmi m M ssi N N
vspEpnnawmw N N Ntrtp LL
9 9 a
FIGURE 10-35
ISOCONCENTRATION MAP
IRON IN TRANSITION ZONE WELLS

N---------------� ••---------------------
A , '
•
• � CW-[
• / M wwo?- �.
- • MW-02'
833 (_ 7.
r
BG-02°
135 (NS In35
L
4 4
LEGEND
50 N N fW h X
50 BOLD VALUESN N N
M6D' (50) N N hl'V h X
W-7,
269 (260) T r i. (50) BOLD VALUESN N N
N hh N Kry N N
50 W N N N N N N
• N
•�- N N N
024 ._.•��• U.= ._ N N N
1(NS) �•�-��-�_• ��^ N N N N N N
a'
Fm
PPOI88176)
•
♦
1 �
-F L 4.� '•
1
Lam.. ♦
MAYO
LAKE
•
.v
NOTES:
N
N N
N hhi nr N N g
N
N N
N fdi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N hhi nrN N g
N
N
hh N N
N NiN hg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
fdni i IW
voh"
N pi i pii viirrmii nuii ndii
WN X =
DUKE
All ENERGYa
s mTerra PROGRESS
rrpvN N dN Nni c N N N N
a
IN NMI m ni ssi N N
vspEpnmm~ N N Nt rt p LL
9 9 a
N N
FIGURE 10-36
ISOCONCENTRATION MAP
MANGANESE IN TRANSITION ZONE WELLS

N---------------�
A • �
•
•
r
6D'
1
OPT
LAKE
LEGEND
6.5-8.5 TOTAL pH CONCENTRATION (S.U.)
6.5-8.5 BOLD VALUES INDICATE AN EXCEEDANCES
NORTH CAROLINA2L CONTOUR (DASHED WHERE ESTIMATED)
(HASH MARKS INDICATE DIRECTION OF EXCEEDANCES)
MONITORING WELL
ACTIVE ASH BASIN BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
�^ DUKE ENERGY PROGRESS MAYO PLANT SITE BOUNDARY
— STREAM
NOTES:
1 CONCENTRATIONS ARE FROM THE MARCH 2O15 SAMPLING EVENT.
2 CONCENTRATIONS ARE FROM THE MAY 2015 SAMPLING EVENT.
3 CONCENTRATIONS ARE FROM THE JUNE 2015 SAMPLING EVENT.
4 CONCENTRATIONS ARE FROM THE JULY 2015 SAMPLING EVENT.
5 THE NORTH CAROLINA 2L RANGE FOR pH IS 6.5 TO 8.5 S.U..
6 SITE AERIAL ORTHOPHOTOGRAPHY IS DATED APRIL 17, 2014. IT WAS OBTAINED
FROM WSP.
7 ADDITIONAL OFFSITE AERIAL ORTHOPHOTOGRAPHY IS DATED 2012. IT WAS
OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS.
(http://services.nconemap.gov/)
8 PARCEL BOUNDARY WAS OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC
INFORMATION AND ANALYSIS. (hftp://services.nconemap.gov/)
9 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD8312011).
GRAPHIC SCALE
400 0 400 800 1,200 1,600 2,000
(IN FEET)
1�lp
symTerra
148 RIVER STREET, SUITE 220,
GREENVILLE, SC 29601
864-421-9999
www.synterracorp.com
�� DUKE
ENERGY
PROGRESS
MAYO STEAM ELECTRIC POWER PLANT
10660 BOSTON RD
ROXBORO, NORTH CAROLINA 27574
FIGURE 10-37
ISOCONCENTRATION MAP
pH IN TRANSITION ZONE WELLS

N---------------� h
A• Jy
L
MW-12D'
< 0.2 (< 0.2)
�.—...... ......
7
it
SR:15p1 ,
CW-024
<0.2(NS)----���•
1981 � ♦
LANDFILL s.♦ '
J ,
CW-01°
Y
♦' MAYO
LAKE
1•
A"�
Ala
lt� .JJ� .�
LEGEND
0.2 N N fW h X
0.2 BOLD VALUESN N N
(0.2) N N IW h X
(0.2) BOLD VALUESN N N
N N N IW N N
W N N N N N N
N
N N N
�._._ N N N
N N N N N N
I —
NOTES:
N
N N
N hhi nr N
N g
N
N N
N Idi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N Ni nrN
N g
N
N
N
N
RVM N N N gt
hg
N
N
N N N
Nt Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g fX
w
N N
N
N NN
N
N N N N
N
N
Nni i IW
vohti"
N
pi i pii vii ranii nuii ndii
WN X
DUKE
All ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-38
ISOCONCENTRATION MAP
THALLIUM IN TRANSITION ZONE WELLS

ff
CW-034 _ MW=16D'
`• , 200
CW-024`�-
-� _�•
210
MW-12D8
120
1
1,
•
MAYO
LAKE
1•
' J
s
•J
:.r
LEGEND
500 TOTAL DISSOLVED SOLIDS CONCENTRATION (mg/L)
500 BOLD VALUES INDICATE AN EXCEEDANCE5
NORTH CAROLINA2L CONTOUR (DASHED WHERE ESTIMATED)
(HASH MARKS INDICATE DIRECTION OF LOWER CONCENTRATIONS)
MONITORING WELL
ACTIVE ASH BASIN BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
�^
DUKE ENERGY PROGRESS MAYO PLANT SITE BOUNDARY
—
STREAM
NOTES:
1 CONCENTRATIONS ARE FROM THE MARCH 2O15 SAMPLING EVENT.
2 CONCENTRATIONS ARE FROM THE MAY 2015 SAMPLING EVENT.
3 CONCENTRATIONS ARE FROM THE JUNE 2015 SAMPLING EVENT.
4 CONCENTRATIONS ARE FROM THE JULY 2015 SAMPLING EVENT.
5 THE NORTH CAROLINA2L FOR TOTAL DISSOLVED SOLIDS IS 500 mg/L.
6 SITE AERIAL ORTHOPHOTOGRAPHY IS DATED APRIL 17, 2014. IT WAS OBTAINED
FROM WSP.
7 ADDITIONAL OFFSITE AERIAL ORTHOPHOTOGRAPHY IS DATED 2012. IT WAS
OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS.
(http://services.nconemap.gov/)
8 PARCEL BOUNDARY WAS OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC
INFORMATION AND ANALYSIS. (hftp://services.nconemap.gov/)
9 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD8312011).
GRAPHIC SCALE
400 0 400 800 1,200 1,600 2,000
(IN FEET)
1�lp
symTerra
148 RIVER STREET, SUITE 220,
GREENVILLE, SC 29601
864-421-9999
www.synterracorp.com
�� DUKE
ENERGY
PROGRESS
MAYO STEAM ELECTRIC POWER PLANT
10660 BOSTON RD
ROXBORO, NORTH CAROLINA 27574
FIGURE 10.39
ISOCONCENTRATION MAP
TOTAL DISSOLVED SOLIDS IN TRANSITION
ZONE WELLS

N---------------�
A
El
j
4-
0.3 (N '�----��
a'
MW-07D'
•
1981
LANDFILL s.
CW-01"
0.543 (NNS
Lam.
MAYO
LAKE
,
LEGEND
0.3 N N NV h X
0.3 BOLD VALUESN N N
(0.3) N N IW h X
(0.3) BOLD VALUESN N N
N N N IW N N
W N N N N N N
N
N N N
�._._ N N N
N N N N N N
I —
NOTES:
N
N N
N hhi nr N
N g
N
N N
N Idi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N hhi nrN
N g
N
N
N
N
IW M N N Ng)
hg
N
N
N N N
hit ddi npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g fX
w
N N
N
N NN
N
N N N N
N
N
Nni i IW
vohti"
N
pi i pii vii ranii nuii ndii
WN X
DUKE
Alp ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-40
ISOCONCENTRATION MAP
VANADIUM IN TRANSITION ZONE WELLS

N---------------� •�---------------------
h
/ •'� _ CW-04a
< 1 (NS) •
MW-03BR'
/ ftMW205BRia
<1 (NS)
,-o5a
LEGEND
1 N N NV hX
7 BOLD VALUESN N N
(1) N N fW hX
MW;16BR' (1) BOLD VALUESN N N
<1 (<1) m6mmo6m N N N NV N N
W N N N N N N
•�� � N
•�� N N N
a ._.•�� U._._ N N N
-�. .•�� ��^ N N N N N N
c�ei_ncai_ '
.r III/
Q-'07�9BR;i
1;
.f
��•�' X
Cam.. •
MAYO
LAKE
,
/ s
NOTES:
N
N N
N hhi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N hhi nrN
N g
N
N
N
N
RV M N N Nn
hg
N
N
N N N
Nt Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g hX
w
N N
N
N NN
N
N N N N
N
N
fdni i IW
vohti"
N
pi i pii vii rttnii nuii ndii
WN X
DUKE
1�lp ENERGY°
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-41
ISOCONCENTRATION MAP
ANTIMONY IN BEDROCK WELLS

N---------------� ••---------------------
• �rn •
A / •'� _ CW-04a
< 1 (NS) •
MW-03BR'
/ ftMW205BRia
<1 (NS)
-n5a
LEGEND
10 N N fW h X
10 BOLD VALUESN N N
(10) N N fW h X
MW;16BR' (10) BOLD VALUESN N N
2.05 (2.07) N hh N fW N N
� W N N N N N N
•�• N
•�- � N N N
a ._.•�� U-_-_ � N N N
-�. .•�• ��^ N N N N N N
c�ei_ncai_ '
J
1 M�Wj096B
f
,
.fl
Lam• . ♦
♦' MAYO
LAKE
,
NOTES:
N
N N
N hhi nr N N g
N
N N
N fdi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N hhi nrN N g
N
N
hh N N
N hhN h g
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g fX
w
N N
N
N NN
N N N N N
N
N
fdni i IVV
voh"
N
pi i pii vii rttnii nuii ndii
WN X
DUKE
1�lp ,
ENERGY.,
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-42
ISOCONCENTRATION MAP
ARSENIC IN BEDROCK WELLS

N---------------� W
%.,-
i0 J
C-04° - 25 (NS)
x _ i MW-03BR'
/ • M1N=14BR' r 46 (NS)
A2105BRWKWOMIC-
LEGEND
700 N N NV h X
700 BOLD VALUESN N N
(700) N N NV h X
MW;16BR' (700) BOLD VALUESN N N
11 (9) N N N NV N
� W N N N N N
•�• N
•�- � N N N
a ._.•�� U._._ � N N N
-�. .•�• ��^ N N N N N N
I —
Rmw �..—..
ENNER MWL09BR ._
1
LAKE
,
N X
N X
NOTES:
N
N N
N hhi nr N N g
N
N N
N fdi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N hhi nrN N g
N
N
hhN N
NNiiNhg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
fdni i NV
voh"
N
pi i pii vii ranii nuii ndii
WN X =
DUKE
a
ENERGY
synTerra PROGRESS
rrpvN N dN Nni c N N N N
a
IN NMI m ni ssi N N
vspEpnmm~ N N Nt rt p LL
9 9
a
arw,� N N N PtWpi m
h,E N N N PtWpi m
'# N N
FIGURE 10-43
ISOCONCENTRATION MAP
BARIUM IN BEDROCK WELLS

N---------------� %.,
0 J
•
- AW,
< 50 (NS) -
'x - i MW-03BR'
< 50 (NS)
IIV=I4BR'
50 (<''50)
�SR:1501
"
LEGEND
700 N N NV h X
700 BOLD VALUESN N N
(700) N N RV h X
MW;16BR' (700) BOLD VALUESN N N
< 50 (< 50) N hh N Kry N N
� W N N N N N N
•�• � N
•�� N N N
.�� _ N N N
( _'-� .•�• ��^ N N N N N N
I —
1961 b
7r
LANDFILL - - V • .
MW-096R3
< 50 (< 50) • 1 NOTES:
. ,` • m N N N N hhi nr N N g
D21B `
a ` N N N N hhi nrN N g
90) CW-01D
<50 (NS) : N N N N Ni nrN N g
p N N N N hhi nrN N g
D4BR' •�� N N hhN N NNiiN hg
i0) ; N N N N N Nt bi npJpJ N N
• N g
Y `� -♦ • N N N N N hhi nnp N
N N N N N N N N N 9
♦' MAYO W 9 9
N N N N N N N N N
LAKE
i �. ♦ N N VN 0 9 9
M�BR.NN N N Idni i IW vohN N N N N</
. ,.... ,'
�� �•L
0.
pi vi i rani i nui i nd i i
WN X
DUKE
-!
w�A<t5ENERGYoo
F=j Ter PROGRESS
01
rrpvN N dN Mni c N N N N a
(N Nvzi m M ssi N N o
vspEpnmmymw N N Nt rt p w
9 9 <
m
N N Ptwplm
FIGURE 10-44
ISOCONCENTRATION MAP
a
1 BORON IN BEDROCK WELLS
a

N--------------- •�---------------------
A •
\- • SR,1501 �a--
ABMW-02BR
0.00741
� I I
l• �
r
r /
I
•
j
.. -.. -.. -..... -.. r_..-1
4
MW;16BR'
LEGEND
0.035 N NV m
0.035 BOLD VALUESN N N
0.017 N NV
� W N
N N
•�• �
•�� N N N
W-02D° .�••�� U._-_ N N
.084--��-•�- ��^ N N
\�
1981 �
LANDFILL � _ '
MAYO
LAKE
,
$ • A
` J
�-� -�
`-1
1
IW h X
N
N
X
N
N
N
N X
N
N
N
N
N
NOTES:
N
N N
N hhi nr N
N g
N
N N
N Idi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N hhi nrN
N g
N
N
N
N N
NVMNgorN hJW c
ni nrX
N
N
N N N
hit Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 g
g fX
w
N N
N
N NN
N
N N N N
N
N
Nni i IW
vohti"
N
pi i pii vii ranii nuii ndii
WN X
1�lp
symTerra
rrpvN N N Nni c
IN NMI m
vspEpnmm~
9 9
�� DUKE
ENERGY
PROGRESS
N N N N
I'll ssi N N <
N N Ntrtp
FIGURE 10-45
ISOCONCENTRATION MAP
CHROMIUM (VI) IN BEDROCK WELLS

N---------------�
A •
' I
♦ /
N
MW-11BR'
.'------------------ LEGEND
h ' 1 N N NV h X
•J` - cW-04° ' 7 BOLD VALUESN N N
r —
/ <1 (NS) • (1) N N NV hX
MW-03BR' MW;16BR' (1) BOLD VALUESN N N
MW-14BR' < 1 (NS) < 1 (< 1) , , N N N fW N N
1.41 (1.41) W N N N N N N
1 cW-05° ,SR fspl • _ . • N N N
< 1 (NS) cW-02U° . • U . _ . _ N N N
MW-O5BR' <1(NS) --�. --•��� ��^ N N N N N N
I -
GW-O6° '
I
.r f
MW-09BR ._
fl -
LAKE
,
k -.
3R'
NOTES:
N
N N
N hhi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N 9
p
N
N N
N hhi nrN
N 9
N
N
N
N
KV XN N N NN h g
N
N
N N N
Ntddi npJpJ N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N 9
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
VN 0
g
g Bx
w
N N
N
N NN
N
N N N N
N
N
fdni i IW
voh"
N
pi i pii vii rttnii nuii ndii
WN X
tip DUKE
ENERGY°
s mTerra PROGRESS ol
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-46
ISOCONCENTRATION MAP
COBALT IN BEDROCK WELLS

N---------------�
A •
•
----------------------.
LEGEND
^°' "` •
300 N N IW h X
300 BOLD VALUESN N N
•
(300) N N f+YV h X
•' " $
MW=03BR
(300) BOLD VALUESN N N
W-146R'
300 648 (NS)°'
y ,MW-16BR'
� N hh N fW N N
80
W N N N N N N
(12), -
SR
- /
/ -
CW-05°
CW-02D° - - _ . -
N N N
1060 (NS)
278 (NS) , / '
U - _ - _ N N N
N N N N N N
I —
CW-064
2040 (NS)
MW-07BR' MW-08BR'
339 (223) 2200 (2030)
ACTIVE
- - -
ASH BASIN
...�'
LANDFILL
�
•
MW-09BR
3000 (102)
.'
0
1
f♦
MAYO
LAKE
,
.�
r
NOTES:
m
N
N N
N hhi nr N
N g
N
N N
N Idi nrN
N g
^
N
N N
N Ni nrN
N g
p
N
N N
N Ni nrN
N g
N
N
N N N
N Idii N h g
N
N
N N N
Ntddi npJpJ N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N 9
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
VN 0
g
g fX
w
N N
N
N NN
N
N N N N
N
N
Idni i IW
voh"
N
pi i pii vii rttnii nuii ndii
WN X
tip DUKE
ENERGY.,
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-47
ISOCONCENTRATION MAP
IRON IN BEDROCK WELLS

N---------------� •'---------------------
h •
A ,
• �J
CW-04°
< 5 (NS) . ..: y
' MV1
73
544 (543)
MW-O5BR' CW
OCTIKIC
u
. .. . .. . .. . .. . ..
W
It-
.
SR,150
1
LEGEND
50 N N fW h X
50 BOLD VALUESN N N
(50) N N h1V h X
V=16BR' (50) BOLD VALUESN N N
(25) 1 1 N hh N Kry N N
� W N N N N N N
•�• N
} .•�- N N N N N
N
�. .•�• ��^ N N N N N N
CW-064
1450 (NS) .�y
MW-07BR' .. nco—T ol3 A
.
981
ND
LANDFILL �
J
MW-096R
X
�' MAYO
LAKE
FEW0BR'95�4)
♦
r
NOTES:
N
N N
N hhi nr N N g
N
N N
N Idi nrN N g
^
N
N N
N Ni nrN N g
p
N
N N
N hhi nrN N g
N
N
hh N N
N NiN hg
N
N
N N N Ntddi npJpJ N N
N
g
r
N
N
N
N N hhi nnp N
N N
N
N N
N N N N 9
W 0
9
9
�x
N
N
N
N N N N N N
N
N
VN 0
g g Bx
w
N N
N
N NN
N N N N N
N
N
Idni i IW
voh"
N
pi i pii vii rttnii nuii ndii
WN X
tip DUKE
ENERGY.,
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-48
ISOCONCENTRATION MAP
MANGANESE IN BEDROCK WELLS

N---------------�
A •
4
MW-16BR'
8.7�
LEGEND
6.5-8.5 TOTAL pH CONCENTRATION (S.U.)
6.5-8.5 BOLD VALUES INDICATE AN EXCEEDANCE5
NORTH CAROLINA2L CONTOUR (DASHED WHERE ESTIMATED)
(HASH MARKS INDICATE DIRECTION OF EXCEEDANCES)
•
MONITORING WELL
•
ACTIVE ASH BASIN BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
- . �— . •
f
�^
DUKE ENERGY PROGRESS MAYO PLANT SITE BOUNDARY
> -
STREAM
1981
LANDFILL s ♦ '
MW-09BR
6.5 � •
CW-01 D4
6.8
,
- - 1
Cam.. ♦
`♦' � MAYO
LAKE
my jOQ
79 '
.v
NOTES:
CONCENTRATIONS ARE FROM THE MARCH 2O15 SAMPLING EVENT.
s CONCENTRATIONS ARE FROM THE MAY 2015 SAMPLING EVENT.
8 CONCENTRATIONS ARE FROM THE JUNE 2015 SAMPLING EVENT.
4 CONCENTRATIONS ARE FROM THE JULY 2015 SAMPLING EVENT.
5 THE NORTH CAROLINA 2L RANGE FOR pH IS 6.5 TO 8.5 S.U..
6 SITE AERIAL ORTHOPHOTOGRAPHY IS DATED APRIL 17, 2014. IT WAS OBTAINED
FROM WSP.
7 ADDITIONAL OFFSITE AERIAL ORTHOPHOTOGRAPHY IS DATED 2012. IT WAS
OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS.
(http://services.nconemap.gov/)
8 PARCEL BOUNDARY WAS OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC
INFORMATION AND ANALYSIS. (hftp://services.nconemap.gov/)
9 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD8312011).
GRAPHIC SCALE
400 0 400 800 1,200 1,600 2,000
(IN FEET) _
DUKE
a
ENERGY
s mTerra PROGRESS
148 RIVER STREET, SUITE 220, MAYO STEAM ELECTRIC POWER PLANT a
GREENVILLE, SC 29601 10660 BOSTON RD
864-421-9999 ROXBORO, NORTH CAROLINA 27574 LL
www.synterracorp.com a
FIGURE 10-49
ISOCONCENTRATION MAP
pH IN BEDROCK WELLS

N---------------� h --------------------
• Jy
-
<
... x _ MW-03BR'
/ • M1N=14BR' + < 0.2 (NS)
• < 0.2 (<0.2) .
. �SR;1 '
M_0W-O5BR� CW5°1
_. .. .. _ 7.., 5p.
LEGEND
0.2 N N f+YV h X
0.2 BOLD VALUESN N N
(0.2) N N fW h X
MW;16B R' (0.2) BOLD VALUESN N N
< 0.2 (< 0.2) N N N NV N
� W N N N N N N
•�� N
•�� � N N N
a ._.•��• N N N
�) �.�—.•�� ��^ N N N N N N
J
h.. M.1
R
0.2)
-1
.f
`♦' � MAYO
LAKE
•
.v
NOTES:
N
N N
N hhi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N Ni nrN
N g
N
N
N
N
RVM N N Ngt
hg
N
N
N N N
Nt Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g fX
w
N N
N
N NN
N
N N N N
N
N
Nni i IVV
vohti"
N
pi i pii vii rttnii nuii ndii
WN X
tip DUKE
ENERGY.,
s mTerra PROGRESS
rrpvN N N Nni c N N N N a
IN NMI m ni ssi N N o
vspEpnmm~ N N Nt rt p w
9 9
FIGURE 10-50
ISOCONCENTRATION MAP
THALLIUM IN BEDROCK WELLS

N--------------
A
/ mIAI
rr a
SR.1501 - 1'l-- I '
CW-02DU
250 - ..... '
190
1961
LANDFILL ,r � a
MW-09BR .-
220,
ABMW-02BR'
370 CW-01 D°
200 '
,
AIBM W-04BR'
370 X
' MAYO
LAKE
LEGEND
500 TOTAL DISSOLVED SOLIDS CONCENTRATION (mg/L)
500 BOLD VALUES INDICATE AN EXCEEDANCE5
NORTH CAROLINA2L CONTOUR (DASHED WHERE ESTIMATED)
(HASH MARKS INDICATE DIRECTION OF LOWER CONCENTRATIONS)
MONITORING WELL
ACTIVE ASH BASIN BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
�^ DUKE ENERGY PROGRESS MAYO PLANT SITE BOUNDARY
- STREAM
NOTES:
1 CONCENTRATIONS ARE FROM THE MARCH 2O15 SAMPLING EVENT.
2 CONCENTRATIONS ARE FROM THE MAY 2015 SAMPLING EVENT.
3 CONCENTRATIONS ARE FROM THE JUNE 2015 SAMPLING EVENT.
° CONCENTRATIONS ARE FROM THE JULY 2015 SAMPLING EVENT.
THE NORTH CAROLINA2L FOR TOTAL DISSOLVED SOLIDS IS 500 mg/L.
6 SITE AERIAL ORTHOPHOTOGRAPHY IS DATED APRIL 17, 2014. IT WAS OBTAINED
FROM WSP.
7 ADDITIONAL OFFSITE AERIAL ORTHOPHOTOGRAPHY IS DATED 2012. IT WAS
OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS.
(http://services.nconemap.gov/)
8 PARCEL BOUNDARY WAS OBTAINED FROM THE INC CENTER FOR GEOGRAPHIC
INFORMATION AND ANALYSIS. (hftp://services.nconemap.gov/)
9 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD8312011).
GRAPHIC SCALE
400 0 400 800 1,200 1,600 2,000
(IN FEET)
tT i DUKE
ENERGY.,
s mTerra PROGRESS
148 RIVER STREET, SUITE 220, MAYO STEAM ELECTRIC POWER PLANT
GREENVILLE, SC 29601 10660 BOSTON RD o
864-421-9999 ROXBORO, NORTH CAROLINA 27574 w
www.synterracorp.com Q
FIGURE 10-51
ISOCONCENTRATION MAP
TOTAL DISSOLVED SOLIDS IN BEDROCK
WELLS

N---------------�
A •
,
,
M W-71 BR'
2.69 (2.39)
................
LEGEND
0.3 N N NV h X
0.3 BOLD VALUESN N N
(0.3) N N NV h X
tMW-16R" (0.3) BOLD VALUESN N N
2.68) m6mmo6m N N N NV N N
W N N N N N N
•�• N
•�� � N N N
•�� �._._-1 N N N
g) ��.•�•�_-�^ N N N N N N
+ F-'
I —
< 0.3 Q 0.3) .. — . .
0.3
_:;Ooo
•
MW-096R
1•
LAKE
,
h- �A-
\� f
NOTES:
m
N
N N
N hhi nr N
N g
N
N N
N fdi nrN
N g
^
N
N N
N Ni nrN
N g
o
N
N N
N hhi nrN
N g
N
N
N
N
NV M N N Ng)
hg
N
N
N N N
hit Ni npg% N N
N
g
r
N
N
N
N N Ni nnp N
N N
N
N N
N
N N N g
W 0
9
9
�x
N
N
N
N N N
N N N
N
N
ON 0 9
g BK
w
N N
N
N NN
N
N N N N
N
N
fdni i NV
vohti"
N
pi i pii vii rttnii nuii ndii
WN X
tip DUKE
ENERGY.,.
symTerra PROGRESS
rrpvN N dN Nni c N N N N a
(N Nmi m M ssi N N o
vspEpnmm~ N N Nt rt p w
9 9 a
m
N N N InWnl
h,E N N N In:m
�'#._'N N 1N QJ
F FIGURE 10-52
"`- ISOCONCENTRATION MAP
l _ VANADIUM IN BEDROCK WELLS