NC0003425_04_Rox_CAP Update 2019_Tables_20191231

Corrective Action Plan Update December 2019
Roxboro Steam Electric Plant
TABLES
CAP Content Section 9
SynTerra

Corrective Action Plan Update December 2019
Roxboro Steam Electric Plant SynTerra
Table ES-1
Summary of Roxboro Assessment
Documentation
Included in Executive Summary text

Corrective Action Plan Update December 2019
Roxboro Steam Electric Plant SynTerra
Table ES-2
Summary of Roxboro Assessment
Activities
Included in Executive Summary text

Corrective Action Plan Update December 2019
Roxboro Steam Electric Plant SynTerra
Table ES-3
Components of Source Control, Active
Remediation, and Monitoring
Included in Executive Summary text

TABLE 3-1
CORRECTIVE ACTION EVALUATION SUMMARY OF ROXBORO ASH BASINS AND
HYDRAULICALLY CONNECTED ADDITIONAL SOURCE AREAS
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Evaluated
as Source
Rationale
Facility
CSA
Operational
Area
Area in
Source Material
for Corrective Action
Name
Schedule
Status
or Capacity
CAP
Evaluation
Update
71.3 acres/
East Ash Basin
Coal Ash/NPDES
3,240,000 cy
(excluding Industrial
Yes
NA
Inactive
Permitted waste
(3,888,000 tons)
CAMA-regulated unit
Landfill)
streams
CCR'
42 acres
(halo only)
CCR and
/6,363,000 cy
Hydrologically connected to
Industrial Landfill
Yes
NA
Active
operational waste
(estimated volume
EAB; regulated by NCDEQ
Halo Area
material
for all material
DWM under Permit 7302-
placed in the
INDUS.
landfill beneath
Phases 1 - 6)
Land Clearing and
Land clearing and
Hydrologically connected to
Inert Debris (LCID)
Yes
NA
Inactive
inert debris
6.5 acres
EAB; regulated by NCDEQ
Landfill
partially underlain
DWM under Permit 73-D.
by CCR
Gypsum Storage Area
CCR, as structural
12.5 acres /
Hydrologically downgradient
(GSA)
Yes
NA
Active
fill, and gypsum
131,319 cy CCR
of EAB; regulated by NCDEQ
DWM under Permit CCB0003.
Dry Fly Ash (DFA)
Hydrologically downgradient
Silo and Operational
Yes
NA
Active
CCR
-5 acres
of EAB.
Area
Historic Eastern
Historic local CCR will be
Discharge Canal
No
NA
Inactive
CCR
- 1.7 acres
removed
Deposition Area
186 acres/
Coal Ash/NPDES
10,811,166 cy
No COI exceedance to
West Ash Basin
No
NA
Inactive
Permitted waste
(-12,973,400
applicable standards beyond
streams
tons) CCR
the compliance boundary
Decommissioned
No
NA
Inactive
Coal Ash
- 3 Acres
Historic local CCR will be
Sluice Line Area
removed
Prepared by: KTL Checked by: COE
Notes:
'CCR esitmates provided within East Ash Basin and West Ash Basin Closure In -Place and Closure by Excavation Closure Plan Reports
(Wood, 2019)
CSA Schedule - applicable only for units identified in the letter "Final Comprehensive Site Assessment and Corrective Action Plans Approvals for
Duke Energy Coal Ash Facilities" (April 5, 2019)
CAMA - North Carolina Coal Ash Management Act of 2014
CAP - Corrective Action Plan
cy - cubic yards
DWM - Division of Waste Management
NA - Not applicable
NA - not applicable
NCDEQ - North Carolina Department of Environmental Quality
NPDES - National Pollutant Discharge Elimination System
Page 1 of 1

TABLE 4-1
BACKGROUND SOIL SAMPLE SUMMARY
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Soil Boring
Depth Range
(ft bgs)
Number of Sampled Intervals
BGSB-02
(4-8)
2
BGSB-14
(2-10)
4
BGSB-18
(2-13)
5
BGSB-112
(2-20)
6
MW-08
(14-23)
2
MW-13BR
(22-24)
1
MW-14BR
(1-38)
3
MW-17
(29-31)
1
MW-18
(31-38)
2
Note:
ft bgs - feet below ground surface
Prepared by: KTL Checked by: CDE
Page 1 of 1

TABLE 4-2
BACKGROUND VALUES FOR SOIL
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Constituent
Reporting
Unit
PSRG Protection
of Groundwater
2018
Background
Threshold Values'
2019 Updated
Background
Threshold ValueS2
Piedmont
Background Threshold
Value Range
pH*
S.U.
NE
4.4-9.7
4.2-9.8
2.3-9.8
Aluminum
mg/kg
110,000
34353.0
34,353
25,978 - 81,619
Antimony
mg/kg
0.9
0.6
0.6
0.177 - 0.9
Arsenic
mg/kg
5.8
1.6
1.2
1.2 - 43.13
Barium
mg/kg
580
222
222
122.2 - 1,063
Beryllium
mg/kg
63
0.8
1.4
1.2 - 4.52
Boron
mg/kg
45
2.9
15
14.4 - 56.3
Cadmium
mg/kg
3
0.02
0.03
0.03 - 1
Calcium
mg/kg
NE
3,113
5,300
410 - 8,769
Chloride
mg/kg
NE
11.8
296
12 - 423
Chromium
mg/kg
3.8
11
53
20 - 440
Cobalt
mg/kg
0.9
11
27
27 - 81.68
Copper
mg/kg
700
114
128
17.4 - 216
Iron
mg/kg
150
27,147
30,601
24,500 - 85,345
Lead
mg/kg
270
6.9
7.5
7.5 - 95.23
Magnesium
mg/kg
NE
6,490
17,846
760 - 51,829
Manganese
mg/kg
65
532
590
370 - 3,388
Mercury
mg/kg
1
0.08
0.1
0.04 - 0.113
Molybdenum
mg/kg
7.1
2.8
2.8
1.83 - 12
Nickel
mg/kg
130
6.9
18
9.2 - 237
Nitrate (as N)
mg/kg
NE
0.7
30
0.25 - 31.2
Potassium
mg/kg
NE
9,465
9,465
427 - 35600
Selenium
mg/kg
2.1
1.6
1.6
1.58 - 6.857
Sodium
mg/kg
NE
456
553
338 - 1500
Strontium
mg/kg
1,500
39.2
65.7
7.1 - 200
Sulfate
mg/kg
1,938^
11
296
12 - 437
Thallium
mg/kg
0.28
0.15
0.17
0.166 - 2.132
Total Organic Carbon
mg/kg
NE
---
742
742 - 4960
Vanadium
mg/kg
350
68.7
122
42 - 230.9
Zinc
mg/kg
1,200
63.4
70.6
60.5 - 325.5
Prepared by: JHG Checked by: KTL
Notes:
^ - PSRG Protection of Groundwater value was calculated using the equation shown in Section 6
* - Upper and lower threshold values calculated for parameter
' - Background threshold values were calculated using data from background unsaturated soil samples collected February 2015 to July 2017.
2 - Updated background threshold values were calculated using data from background unsaturated soil samples collected February 2015 to July 2017.
The background threshold value updates retained extreme outlier concentrations in background unsaturated soil datasets (SynTerra, 2019).
s - Piedmont background threshold value ranges include the Duke Energy calculated 20174 and 2019' background threshold values from 10 Duke Energy facilities located in
the Piedmont physiographic region (Allen Steam Stations, Belews Creek Steam Stations, Buck Steam Station", Cape Fear Steam Electric Plant°, Cliffside Steam Stations, Dan
River Steam Station", Marshall Steam Stations, Mayo Steam Electric Plants, Riverbend Steam Station°, and Roxboro Steam Electric Plant).
--- - 2018 background threshold value was not calculated for constituent.
mg/kg - milligrams per kilogram
NE - not established
S.U. - standard unit
PSRG - Preliminary Soil Remediation Goals
Page 1 of 1

TABLE 4-3
BACKGROUND VALUES FOR GROUNDWATER
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Constituent
Reporting
Unit
15A NCAC
02L
Standard
2017 Background
Threshold Values'
2019 Updated
Background Threshold ValueS2
Piedmont
Background
Threshold Value Range
Transition
Flow Zone
Bedrock
Flow Zone
Transition
Flow Zone
Bedrock
Flow Zone
pH
S.U.
6.5 - 8.5
6.3 - 7.6
6.8 - 8.3
6.3 - 7.6
6.1 - 8.3
3.6 - 9
Alkalinity
mg-CaCO3/L
NE
273
317
283
379
19 - 379
Aluminum
pg/L
NE
1237
378
734
183
100 - 1,238
Antimony
pg/L
1*
1
1
1
1
0.5 - 2.9
Arsenic
Ng/L
10
1
1
1
6
0.2 - 6.35
Barium
Ng/L
700
91
185
94
135
10.52 - 840
Beryllium
Ng/L
4*
1
1
1
1
0.0625 - 1
Bicarbonate
mg-CaCO3/L
NE
273
317
284
388
19 - 388
Boron
pg/L
700
50
50
50
50
50 - 176.8
Cadmium
pg/L
2
1
1
1
1
0.08 - 1
Calcium
mg/L
NE
132
102
111
106
4 - 111
Carbonate
mg-CaCO3/L
NE
5
5
5
5
5- 10
Chloride
mg/L
250
150
120
180
130
3.34 - 250
Chromium
pg/L
10
25
4
22
4
1 - 26
Chromium (VI)
pg/L
NE
17
0.2
12
1
0.03 - 12
Cobalt
pg/L
1*
1
6
3
18
0.088 - 88.85
Copper
pg/L
1,000
10
1
10
2
0.5- 17.15
Fluoride
mg/L
2
---
---
0.4
0.4
0.1 - 1.8
Iron
pg/L
300
1,210
4,227
1,293
5,130
56.3 - 37,500
Lead
Ng/L
15
1
1
1
1
0-2
Lithium
pg/L
NE
--
---
26
27
2 - 95.39
Magnesium
mg/L
NE
42
32
45
39
1 - 45
Manganese
Ng/L
50
405
1,198
260
1,773
7 -9,170
Mercury
pg/L
1
0.1
0.05
0.05
0.05
0.05-0.5
Methane
Ng/L
NE
10
367
10
1,120
1 - 2,505
Molybdenum
Ng/L
NE
4
35
8
22
0.5 - 26.2
Nickel
pg/L
100
19
2
17
3
0.87 - 48
Nitrate + Nitrite
mg-N/L
NE
3
0.3
4
0.4
0.02 - 6.3
Potassium
mg/L
NE
5
9
5
10
1.609 - 18.8
Selenium
pg/L
20
2
1
2
1
0.5 - 2.4
Sodium
mg/L
NE
36
38
36
57
6- 190
Strontium
Ng/L
NE
760
232
760
438
27 - 2,120
Sulfate
mg/L
250
37
74
38
69
1.2 - 510
Sulfide
mg/L
NE
0.1
0.1
0.2
0.3
0.1 -2
TDS
mg/L
500
540
530
710
560
50 - 1,200
Thallium
pg/L
0.2*
0.2
0.2
0.2
0.2
0.1 -0.2
TOC
mg/L
NE
3
4
2
11
1 - 12.3
Total Radium
pCi/L
5^
7
5
10
4
0.494 - 35
Total Uranium
pg/mL
0.03^
0.005
0.003
0.004
0.006
0.0002 - 0.864
Vanadium
pg/L
0.3*
30
2
23
3
0.33 - 25.8
Zinc
pg/L
1,000
12
7
14
44
5 - 140
Prepared by: HES Checked by:JHG
Notes: Revised by: KTL
2017 background threshold values (BTVs) approved by North Carolina Department of Environmental Quality (NCDEQ) on September 1, 2017.
Background threshold values have been rounded to similar levels of precision as 15A North Carolina Administrative Code (NCAC) 02L Standard or Interim Maximum Allowable Concentration (IMAC).
' - BTVs were calculated using data from background groundwater samples collected November 2010 to January 2017.
- Updated BTVs were calculated using data from background groundwater samples collected November 2010 to November 2018.
3 - Piedmont background threshold value ranges include the Duke Energy calculated 20171 and 2019e background threshold values from 30 Duke Energy facilities located in the Piedmont physiographic
region (Allen Steam Station', Belews Creek Steam Station', Buck Steam Station', Cape Fear Steam Electric Plant', Cliffside Steam Station, Dan River Steam Station', Marshall Steam Station', Mayo
Steam Electric Plant', Riverbend Steam Station', and Roxboro Steam Electric Plante).
--- - BTV was not calculated for constituent.
* - IMAC of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
^ - Federal Maximum Contaminant Level
pg/L - micrograms per liter
pg/mL - micrograms per milliliter
mg/L - milligrams per liter
mg-CaCO3/L - milligrams calcium carbonate per liter
mg-N/L - milligrams nitrogen per liter
NE - not established
pCi/L - picocuries per liter
S.U. - standard units
TDS - total dissolved solids
TOC - total organic carbon
Page 1 of 1

TABLE 4-4
BACKGROUND DATASET RANGES FOR SURFACE WATER
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Constituent
Reporting Unit
Comparison Criteria
Background Range
Constituents with 15A NCAC 02B (Class Water Supply: Class B, WS-V) Standards
pH
S.U.
6.0-9.0
6.3 - 7.4
Dissolved Oxygen
mg/L
>_ 4
0.7 - 8.66
Temperature
deg C
<_ 29
14 - 20
Turbidity
NTU
s 25
4.4 - 12.4
Arsenic
pg/L
10
0.736 j - <1
Arsenic (Dissolved)
pg/L
acute: 340, chronic: 150
0.735 j - <1
Barium
pg/L
1000
28 - 100
Beryllium (Dissolved)
pg/L
acute: 65, chronic: 6.5
<1
Cadmium (Dissolved)'
pg/L
acute: 0.82, chronic: 0.15
<0.1 - <1
Chloride
mg/L
230
7.9 - 30
Chromium (III) (Dissoly
pg/L
acute: 180, chronic: 24
NA
Chromium (VI) (Dissolve
pg/L
acute: 16, chronic: 11
NA
Copper (Dissolved)'
pg/L
acute: 3.6, chronic: 2.7
<1 - 4.48
Fluoride
mg/L
1.8
0.15 - 0.19
Lead (Dissolved)'
pg/L
acute: 14, chronic: 0.54
<1
Mercury
pg/L
chronic: 0.012
0.00118 - 0.00465
Nickel
pg/L
25
0.619 j - 1.76
Nickel (Dissolved)'
pg/L
acute:140, chronic: 16
0.534 j - 1.28
Nitrate + Nitrite
mg-N/L
10
<0.02 - 0.234
Selenium
pg/L
chronic: 5
0.595 j - <1
Silver (Dissolved)'
pg/L
acute: 0.3, chronic: 0.06
<0.3
Sulfate
mg/L
250
9.5 - 24
Thallium
pg/L
2
0.145 j - <0.2
Total Dissolved Solids
mg/L
500
120 - 190
Total Hardness
mg/L
100
76.4 - 81.9
Zinc (Dissolved)'
pg/L
acute: 36, chronic: 36
<5 - 11
Constituents with USEPA National Recommended Water Quality Criteria
Alkalinity
mg/L
chronic: 20
27.1 - 89
Aluminum
pg/L
acute: 620, chronic: 300
159 - 1,380
Antimony
pg/L
5.6
<1
Iron
pg/L
1000
195 - 4,560
Manganese
pg/L
50
40 - 1,260
Constituents without 02B or USEPA Criteria
Bicarbonate
mg-CaCO3/L
NE
27.1 - 89
Boron
pg/L
NE
<50 - 684
Cadmium
pg/L
NE
<0.1 - <1
Calcium
mg/L
NE
10.6 - 20.9
Carbonate Alkalinity
mg-CaCO3/L
NE
<5 - <10
Chromium
pg/L
NE
0.337 j - 1.25
Chromium (VI)
pg/L
NE
0.044 - 0.071
Cobalt
pg/L
NE
<1 - 8
Copper
pg/L
NE
<1 - 2.18
Lead
pg/L
NE
<1
Page 1 of 2

TABLE 4-4
BACKGROUND DATASET RANGES FOR SURFACE WATER
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Constituent
Reporting Unit
Comparison Criteria
Background Range
Lithium
pg/L
NE
NA
Magnesium
mg/L
NE
7 - 13.2
Methane
pg/L
I NE
<10 - 95
Constituents without 02B or USEPA Criteria (Continued)
Molybdenum
pg/L
NE
<1 - 3.25
Potassium
mg/L
NE
1.35 - 2.67
Sodium
mg/L
NE
5.52 - 16.4
Strontium
pg/L
NE
104 - 198
Sulfide
mg/L
NE
<0.1 - <0.2
Total Organic Carbon
mg/L
NE
2.9 - 5.8
Total Radium
pCi/L
NE
NA
Total Uranium
pg/mL
NE
NA
Vanadium
pg/L
NE
1.14 - 6.03
Zinc
pg/L
NE
1.683 j - 10
Prepared by: LWD Checked by: SIB
Notes•
All samples are subject to Class C water quality standards.
Background location sample dates range from 5/15/2019 to 5/3/2018.
1 Standard value dependent on hardness. Calculated hardness dependent metal standards represent the most conservative value.
Standards are calculated using 25 mg/L hardness, even if actual instream hardness values are greater than 25 mg/L.
Z Chromium speciation is not performed for trivalent chromium (Cr(III)). Trivalent values are derived by subtracting hexavalent
chromium values from dissolved chromium values. Where a dissolved chromium value is less than the detection limit ("<"), it is
considered a whole number for purposes of deriving a trivalent chromium value.
Acute - "Compliance with acute instream metals standards shall only be evaluated using an average of two or more samples
collected within one hour." Reference 15A NCAC 02B .0211.
Chronic - "Compliance with chronic instream metals standards shall only be evaluated using averages of a minimum of four
samples taken on consecutive days, or as a 96-hour average." Reference 15A NCAC 02B .0211.
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
mg/L - milligrams per liter
Ng/L - micrograms per liter
pg/mL - micrograms per milliliter
mg-CaCO3/1- - milligrams calcium carbonate per liter
mg-N/L - milligram nitrogen per liter
NA - not available
NE - not established
pCi/L - picocuries per liter
S.U. - standard unit
USEPA - Unitesd States Environmental Protection Agency
Page 2of2

TABLE 4-5
BACKGROUND DATASET RANGES FOR SEDIMENT
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Constituent
Reporting Unit
PSRG Protection of
Groundwater
Background Range
pH
S.U.
NE
6.5 - 7.3
Aluminum
mg/kg
110,000
4660 - 34000
Antimony
mg/kg
0.9
<0.61 - <10.9
Arsenic
mg/kg
5.8
<0.61 - <10.9
Barium
mg/kg
580
23 - 116
Beryllium
mg/kg
63
0.18 j - 0.64
Boron
mg/kg
45
<3.4 - 27.1
Cadmium
mg/kg
3
0.041 j - <1.3
Calcium
mg/kg
NE
1100 - 33000
Chloride
mg/kg
NE
6.7 j - <524
Chromium
mg/kg
3.8
10.3 - 34 B
Chromium (III)
mg/kg
360,000
NA
Cobalt
mg/kg
0.9
7.2 - 17
Copper
mg/kg
700
11.5 - 55
Iron
mg/kg
150
11900 - 26000
Lead
mg/kg
270
2.1 - <10.9
Magnesium
mg/kg
NE
1480 - 17000
Manganese
mg/kg
65
171 - 978
Mercury
mg/kg
1
<0.018 - 0.1
Molybdenum
mg/kg
7.1
<2.7 - <5.4
Nickel
mg/kg
130
4.6 - 23
Nitrate (as N)
mg/kg
NE
<0.29 - <52.4
Nitrate
mg/kg
NE
NA
Potassium
mg/kg
NE
416 - 1290
Selenium
mg/kg
2.1
<1.6 - <10.9
Silver
mg/kg
3.4
0.56 j
Sodium
mg/kg
NE
<327 - <543
Strontium
mg/kg
1500
5.9 - 160
Sulfate
mg/kg
1938A
<15 - <524
Sulfide
mg/kg
NE
<34.5
Thallium
mg/kg
0.28
<0.16 - <10.9
Total Organic Carbon
mg/kg
NE
2300 - 31700
Vanadium
mg/kg
350
36.7 - 82
Zinc
mg/kg
1,200
11.7 - 39
Prepared by: LWD Checked by: SJB
Notes:
Background locations, which were part of the evaluation of potential groundwater to surface water impacts, were approved by North Carolina Department of
Environmental Quality (NCDEQ).
Background location sample dates range from 5/15/2019 to 5/2/2018.
^ - PSRG Protection of Groundwater value was calculated using the equation shown in Section 6
B - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample is less than 1OX the concentration in the method
blank. Analyte concentration in sample could be due to blank contamination.
j - estimated concentration above the adjusted method detection limit and below the adjusted reporting limit
mg/kg - milligrams per kilogram
NA - not available
PSRG - Preliminary Soil Remediation Goals
S.U. - standard unit
< - concentration not detected at or above the adjusted reporting limit
Page 1 of 1

TABLE S-1
APRIL 2019 WATER LEVEL MEASUREMENTS AND ELEVATIONS
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Well ID
Top of Casing
Elevation
(ft. NAVD 88)
Top of Screen
Elevation
(ft. NAVD 88)
Bottom of
Screen
Elevation
(ft. NAVD 88)
April 2019
Measured
Water Level',
(ft. BTOC)
April 2019
Water Elevation
(ft. NAVD 88)
Monitoring
Flow Zone
ABMW-01
470.58
402.57
397.57
7.19
463.39
Ash Pore Water
ABMW-01BR
470.60
359.66
349.66
7.85
462.75
Bedrock
ABMW-02
471.73
398.30
393.30
10.25
461.48
Ash Pore Water
ABMW-02BR
471.68
370.14
365.14
9.80
461.88
Bedrock
ABMW-03
471.75
465.18
460.18
6.92
464.83
Ash Pore Water
ABMW-03BR
471.87
421.22
411.22
22.86
449.01
Bedrock
ABMW-03BRL
471.90
233.27
223.27
41.80
430.10
Bedrock
ABMW-05
480.03
426.37
421.37
11.51
468.52
Ash Pore Water
ABMW-05D
479.98
391.27
386.27
44.32
435.66
Transition
ABMW-06
481.13
423.25
418.25
11.63
469.50
Ash Pore Water
ABMW-06BR
481.19
396.19
391.19
11.47
469.72
Bedrock
ABMW-07
479.33
404.64
399.64
10.91
468.42
Ash Pore Water
ABMW-07BR
479.29
348.84
343.84
14.47
464.82
Bedrock
ABMW-07BRL
480.43
192.53
182.53
19.24
461.19
Bedrock
ABMW-07BRLL
482.80
109.37
94.37
21.94
460.86
Bedrock
BG-01
533.74
498.39
478.89
35.94
497.80
Transition
BG-01BR
534.68
449.20
439.20
35.79
498.89
Bedrock
BG-01BRL
519.99
252.28
242.28
34.50
485.49
Bedrock
BG-01BRLR
521.36
368.48
358.48
36.57
484.79
Bedrock
BG-01D
534.50
492.18
487.18
36.48
498.02
Transition
BG-02BR
534.54
306.13
296.13
45.04
489.50
Bedrock
CCR-100BR
490.73
424.29
414.29
16.57
474.16
Bedrock
CCR-100D
490.56
460.20
450.20
15.25
475.31
Transition
CCR-101BR
454.34
373.04
363.04
9.29
445.05
Bedrock
CCR-101D
454.15
422.96
412.96
7.29
446.86
Transition
CCR-102BR
437.13
368.77
358.77
24.82
412.31
Bedrock
CCR-103BR
425.53
382.29
372.29
7.25
418.28
Bedrock
CCR-104BR
481.50
412.13
402.13
20.80
460.70
Bedrock
CCR-105BR
494.55
462.21
452.21
10.58
483.97
Bedrock
CCR-106BR
501.32
448.93
438.93
11.22
490.10
Bedrock
CCR-107BR
502.31
454.79
444.79
11.19
491.12
Bedrock
CCR-108BR
521.02
456.78
446.78
29.10
491.92
Bedrock
CCR-109BR
501.68
430.69
420.69
24.80
476.88
Bedrock
CCR-110BR
491.28
472.72
462.72
19.58
471.70
Bedrock
CCR-111BR
510.18
484.67
474.67
9.39
500.79
Bedrock
CCR-112BR-BG
548.59
487.11
477.11
12.76
535.83
Bedrock
CCR-113BR
434.95
364.43
354.43
23.74
411.21
Bedrock
CCR-113D
434.72
400.51
390.51
22.15
412.57
Transition
CCR-200BR
491.44
428.12
418.12
32.02
459.42
Bedrock
CCR-201BR
493.86
446.34
436.34
35.20
458.66
Bedrock
CCR-202BR
456.29
394.12
384.12
29.18
427.11
Bedrock
CCR-202D
455.86
418.30
408.30
22.37
433.49
Transition
CCR-203BR
416.97
364.79
354.79
3.97
413.00
Bedrock
CCR-203D
417.04
383.67
373.67
4.82
412.22
Transition
CCR-203S
417.13
1 403.98
1 393.98
1 6.90
1 410.23
1 Saprolite
CCR-204BR
428.17
1 389.96
1 379.96
1 13.42
1 414.75
1 Bedrock
Page 1 of 4

TABLE S-1
APRIL 2019 WATER LEVEL MEASUREMENTS AND ELEVATIONS
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Well ID
Top of Casing
Elevation
(ft. NAVD 88)
Top of Screen
Elevation
(ft. NAVD 88)
Bottom of
Elevation
(ft. NAVD 88)
April 2019Screen Measured
Water Levels
(ft. BTOC)
April 2019
Water Elevation
(ft. NAVD 88)
Monitoring
Flow Zone
CCR-205BR
478.53
402.20
392.20
41.97
436.56
Bedrock
CCR-206BR
472.86
411.70
401.70
16.74
456.12
Bedrock
CCR-206S
472.88
444.86
434.86
18.63
454.25
Saprolite
CCR-207BR
472.92
412.69
402.69
24.98
447.94
Bedrock
CCR-207S
473.09
444.90
434.90
22.72
450.37
Saprolite
CCR-208BR
473.47
413.07
403.07
22.95
450.52
Bedrock
CCR-208S
473.02
440.08
430.08
22.46
450.56
Saprolite
CCR-209BR
472.81
425.64
415.64
14.95
457.86
Bedrock
CCR-209S
472.84
449.58
439.58
15.83
457.01
Saprolite
CCR-210BR
474.11
434.73
424.73
22.12
451.99
Bedrock
CCR-210S
474.12
454.76
444.76
BP'
--
Saprolite
CCR-211BR
473.76
430.58
420.58
16.50
457.26
Bedrock
CCR-211S
473.90
450.78
440.78
14.20
459.70
Saprolite
CCR-212BR
478.24
456.08
446.08
14.47
463.77
Bedrock
CCR-213BR
503.85
447.43
437.43
33.73
470.12
Bedrock
CCR-214BR
501.73
437.46
427.46
37.68
464.05
Bedrock
CCR-215BR
514.43
446.31
436.31
47.97
466.46
Bedrock
CCR-216BR
504.52
470.35
460.35
32.51
472.01
Bedrock
CCR-217BR
469.79
428.52
418.52
16.57
453.22
Bedrock
CCR-218BR
485.62
442.44
432.44
30.79
454.83
Bedrock
CW-01
508.24
485.82
466.02
17.81
490.43
Bedrock
CW-02
424.60
414.04
404.24
12.43
412.17
Transition
CW-02D
424.60
397.05
392.25
12.45
412.15
Bedrock
CW-03
451.79
445.06
437.06
3.84
447.95
Transition
CW-03D
451.61
406.42
401.62
1.10
450.51
Bedrock
CW-04
479.65
452.94
438.26
23.41
456.24
Transition
CW-05
459.74
452.73
437.93
7.43
452.31
Transition
GMW-01A
436.51
408.62
403.62
23.76
412.75
Transition
GMW-02
424.07
399.46
394.46
4.77
419.30
Transition
GMW-06
478.36
447.76
432.76
19.05
459.31
Transition
GMW-07
499.60
457.96
442.96
23.42
476.18
Bedrock
GMW-08R
528.17
478.73
468.73
41.12
487.05
Bedrock
GMW-09
536.52
503.80
488.80
15.55
520.97
Bedrock
GMW-10
494.41
460.97
445.97
23.62
470.79
Bedrock
GMW-11
496.55
463.41
448.41
11.95
484.60
Bedrock
GPMW-01BR
437.41
335.67
325.67
22.54
414.87
Bedrock
GPMW-01D
437.49
387.49
377.49
19.70
417.79
Transition
GPMW-01S
437.30
414.49
404.49
10.69
426.61
Saprolite
GPMW-02BR
436.48
344.28
333.78
23.20
413.28
Bedrock
GPMW-02D
436.31
397.38
387.38
22.54
413.77
Transition
GPMW-03BR
435.66
334.65
324.65
20.81
414.85
Bedrock
GPMW-03D
435.42
409.66
399.66
12.22
423.20
Transition
HWMW-1BR
429.10
334.58
324.58
10.22
418.88
Bedrock
MW-01BRL
508.75
304.41
289.41
56.63
452.12
Bedrock
MW-01BR2
507.86
438.62
428.62
25.70
482.16
Bedrock
MW-02
423.20
400.84
395.84
12.21
410.99
Transition
MW-02BR
493.79
460.69
455.39
11.42
482.37
Bedrock
Page 2 of 4

TABLE S-1
APRIL 2019 WATER LEVEL MEASUREMENTS AND ELEVATIONS
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Well ID
Top of Casing
Elevation
(ft. NAVD 88)
Top of Screen
Elevation
(ft. NAVD 88)
Bottom of
Elevation
(ft. NAVD 88)
April 2019Screen Measured
Water Levels
(ft. BTOC)
April 2019
Water Elevation
(ft. NAVD 88)
Monitoring
Flow Zone
MW-03BR
452.77
392.49
382.49
23.54
429.23
Bedrock
MW-04BR
502.46
419.10
409.10
46.77
455.69
Bedrock
MW-04BRL
502.62
214.66
194.66
41.64
460.98
Bedrock
MW-05BR
458.97
393.14
382.94
26.09
432.88
Bedrock
MW-05D
458.71
440.36
435.36
6.97
451.74
Transition
MW-06BR3
423.22
352.12
342.02
11.90
411.32
Bedrock
MW-06D3
422.85
399.01
394.01
10.90
411.95
Transition
MW-07BR
478.10
428.15
418.15
9.89
468.21
Bedrock
MW-08BR
482.75
403.45
393.45
38.48
444.27
Bedrock
MW-09BR
450.17
405.25
395.25
28.32
421.85
Bedrock
MW-108BRL
522.76
373.70
363.70
40.76
482.00
Bedrock
MW-108BRLL
523.60
127.20
117.20
64.75
458.85
Bedrock
MW-10BR
536.23
497.42
492.42
20.88
515.35
Bedrock
MW-11BR
467.84
424.30
419.30
3.34
464.50
Bedrock
MW-11D
467.28
443.60
433.60
4.42
462.86
Transition
MW-12BR
456.45
401.48
396.48
10.42
446.03
Bedrock
MW-13BR
553.28
507.12
502.12
38.39
514.89
Bedrock
MW-14BR
513.34
433.56
428.56
42.23
471.11
Bedrock
MW-14D
513.36
460.39
455.39
42.11
471.25
Transition
MW-14S
513.39
479.48
474.48
DRY
--
Saprolite
MW-15BR
508.58
454.83
444.83
5.96
502.62
Bedrock
MW-15D
508.72
484.24
474.24
4.76
503.96
Transition
MW-16BR
520.81
467.12
462.12
27.37
493.44
Bedrock
MW-17BR
534.84
467.05
457.05
35.50
499.34
Bedrock
MW-18BR
532.94
432.34
422.34
42.55
490.39
Bedrock
MW-18D
532.96
481.56
471.56
42.69
490.27
Transition
MW-19BRL
564.32
498.16
488.16
35.35
528.97
Bedrock
MW-205BRL
479.68
316.30
306.30
47.20
432.48
Bedrock
MW-205BRLL
480.35
255.95
245.95
47.99
432.36
Bedrock
MW-205BRLLL
480.85
77.85
62.85
50.83
430.02
Bedrock
MW-208BRL
473.76
317.55
307.55
16.51
457.25
Bedrock
MW-208BRLL
473.95
247.55
237.55
16.60
457.35
Bedrock
MW-208BRLLL
474.10
98.70
88.70
16.95
457.15
Bedrock
MW-20BRL
487.11
288.47
278.47
ARTESIAN
--
Bedrock
MW-21BRLR
528.61
390.72
375.72
44.89
483.72
Bedrock
MW-22BR
474.00
410.93
400.93
33.44
440.56
Bedrock
MW-22BRL
474.08
180.79
170.79
15.58
458.50
Bedrock
MW-22D
474.05
444.79
434.79
16.50
457.55
Transition
MW-23BR
518.94
396.74
386.74
43.77
475.17
Bedrock
MW-23BRR
523.82
327.11
317.11
6.53
517.29
Bedrock
MW-24BR
527.07
379.02
369.02
38.80
488.27
Bedrock
MW-25BR
543.38
440.36
430.36
46.18
497.20
Bedrock
MW-26BR
521.29
443.84
433.84
34.67
486.62
Bedrock
MW-27BR
484.04
416.13
406.13
27.23
456.81
Bedrock
MW-28BR
477.03
350.07
340.07
55.82
421.21
Bedrock
MW-29BR
499.09
422.10
412.10
34.68
464.41
Bedrock
MW-30BR
523.95
390.87
380.87
64.09
459.86
Bedrock
Page 3 of 4

TABLE S-1
APRIL 2019 WATER LEVEL MEASUREMENTS AND ELEVATIONS
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Well ID
Top of Casing
Elevation
(ft. NAVD 88)
Top of Screen
Elevation
(ft. NAVD 88)
Bottom of
Elevation
(ft. NAVD 88)
April 2019Screen Measured
Water Levels
(ft. BTOC)
April 2019
Water Elevation
(ft. NAVD 88)
Monitoring
Flow Zone
MW-31BR
505.40
434.71
424.71
37.12
468.28
Bedrock
MW-32BR
512.04
259.27
249.27
37.87
474.17
Bedrock
MW-33BR
520.12
233.89
223.89
57.84
462.28
Bedrock
MW-34BR
446.40
369.61
359.61
25.88
420.52
Bedrock
MW-34D
445.37
400.76
390.76
24.24
421.13
Transition
MW-35BR
446.35
356.04
346.04
8.77
437.58
Bedrock
MW-35D
446.42
413.08
403.08
4.95
441.47
Transition
MW-35S
446.18
435.97
425.97
2.26
443.92
Saprolite
MW-36BR
446.16
372.98
362.98
5.71
440.45
Bedrock
MW-36D
446.32
415.84
405.84
4.63
441.69
Transition
MW-37BR
449.89
366.51
356.51
3.69
446.20
Bedrock
MW-37D
450.23
415.85
405.85
1.06
449.17
Transition
MW-37S
450.23
440.09
430.09
0.57
449.66
Saprolite
MW-39BR
516.13
318.84
303.84
62.02
454.11
Bedrock
MW-39D
515.89
474.77
464.77
29.70
486.19
Transition
Piezometers - Water Level Only
PZ-14
471.74
--
--
15.84
455.90
--
PZ-12
514.41
--
--
42.02
472.39
Ash Pore Water
Prepared by: AKM Checked by: KTL
Notes:
' - Manual water levels measured April 22-23, 2019 unless otherwise indicated
Z Manual water level measured prior to sampling on April 29, 2019
s Well inaccessible at time of water level sweep - manual water level measured prior to sampling on May 1, 2019
4 CCR-210S pump intake is approximatley 24.10 feet below top of casing
-- Not measured or not available
BGS - below ground surface
BP - Water Level below top of dedicated pump
Dry - Well was dry at time of water level sweep
Ft - feet
Ft. btoc - Feet below top of casing
Ft. NAVD 88 - North American Vertical Datum of 1988
See Figure 5-4a and Figure 5-4b for graphical representation of data
Page 4 of 4

TABLE 5-2
WATERSHED GROUNDWATER BALANCE SUMMARY
WEST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Site
Roxboro WAB
Modeling scenario
Pre -Decanting
Post -Decanting
Closure -in -Place
Closure -by -
Excavation
Water balance components
Flow in
Flow out
Flow in
Flow out
Flow in
Flow out
Flow in
Flow out
Direct recharge to the ash basin
37.8
55.7
1.7
55.4
Direct recharge to the watershed outside of
the ash basin
64.9
72.8
68.7
115.4
Pond, sluicing channel, wetland in the ash
basin
34.9
82.7
Drainage inside the ash basin'
82.4
40.1
145.7
Drainage outside of the ash basin
17.9
16.8
17.1
19.7
Flow through and under the main dam
14.2
12.9
6.3
0.2
Flow through and under the filter dam
8.0
1.5
2.9
78.0
Others z
27.8
15.1
4.0
0.2
Prepared by: RY Checked by: CDE
Notes•
1 Drainage includes streams, seeps, ditch, channel, canal, etc. Drainage streams included are depending on the scenario, for example, the pre -decanting
scenario includes streams present prior to closure and closure -by excavation includes streams that form within the excavated ash basin footprint after
closure.
z Other refers to groundwater flow in/out the watershed that are not accounted in the above categories
Flow in refers to recharge to the groundwater system
Flow out refers to discharge from the groundwater system
gpm - gallons per minute
Page 1 of 1

TABLE 5-3
WATERSHED GROUNDWATER BALANCE SUMMARY
EAST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Site
Roxboro EAB
Modeling scenario
April 2019
Approx. July 2020
Closure -in -Place
Closure -by -
Excavation
Water balance components
Flow in
Flow out
Flow in
Flow out
Flow in
Flow out
Flow in
Flow out
Direct recharge to the ash basin
27.4
25.7
1.1
13.5
Direct recharge to the watershed outside of
the ash basin
60.6
60.3
55.7
20.9
Pond, sluicing channel, wetland in the ash
basin
25.8
3.7
Drainage inside the ash basin'
10.5
37.7
12.7
10.2
Drainage outside of the ash basin
32.3
32.1
32.2
8.5
Flow through and under the main dam
20.2
17.9
14.6
12.6
Flow through and under the filter dam
5.1
4.7
2.7
3.2
Others z
5.9
6.5
5.4
3.8
Prepared by: RY Checked by: CDE
Notes:
1 Drainage includes streams, seeps, ditch, channel, canal, etc. Drainage streams included are depending on the scenario, for example, the April 2019 scenario
includes streams present prior to closure and closure -by excavation includes streams that form within the excavated ash basin footprint after closure.
z Other refers to groundwater flow in/out the watershed that are not accounted in the above categories
Flow in refers to recharge to the groundwater system
Flow out refers to discharge from the groundwater system
gpm - gallons per minute
Page 1 of 1

TABLE 5-4
SURFACE WATER CLASSIFICATIONS
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Adjacent Surface Water Body
Surface Water Classification
(15A NCAC 02B .0300)
Hyco Reservoir
Class B, WS-V
Prepared by: KTL Checked by: CDE
Notes:
1. Class B waters are protected for primary recreation, which includes swimming on a frequent or organized basis and all
Class C uses.
2. Class WS-V waters are generally upstream of Class WS-IV waters or waters currently or formerly used by industry for
water supply. These waters are also protected for Class C uses.
NCAC - North Carolina Administrative Code
WS - Water Supply
Page 1of1

TABLE 6-1
BORON CONCENTRATIONS IN GROUNDWATER BELOW SOURCE AREA 1
EAST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Well Beneath
Number of
Time Period
Boron
Concentration
Boron Concentration
Ash
Sample
of Analytical
Range in
Range in Overlying
(Flow Zone)
Events
Data
Groundwater
Pore Water
(N9/�)
(Ng/�)
ABMW-04BR
13
05/2015 -
<50 1
36,800 - 45,400
(Bedrock)
07/2018
(z30' saturated ash)
ABMW-05D
06/2015 -
13,100 - 28,800
(Transition Zone)
14
04/2019
2,200 - 2,980
(�48' saturated ash)
ABMW-06BR
15
03/2015 -
<50 1
2,190 - 3,960
(Bedrock)
04/2019
(;z:;50' saturated ash)
ABMW-07BR
15
05/2015 -
659 - 2,080
(Bedrock)
04/2019
5,670 - 6,610
(;z::70' saturated ash)
ABMW-07BRL
06/2016 -
(Bedrock)
13
04/2019
63 - 245
Prepared by: KTL Checked by: CDE
Notes:
< - concentration not detected at or above the adjusted reporting limit.
1 - Concentrations have not been detected at or above the adjusted reporting limit across all sampling events
pg/L - micrograms per liter
Page 1 of 1

TABLE 6-2
SOURCE AREA INTERIM ACTIONS
EAST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Groundwater
Rationale
Remedy Component
Cessation of EAB
A system was installed to divert DFAHA wastewater flows from the
wastewater flows
EAB to the recently installed plant wastewater treatment system.
Cessation of Industrial
A collection system was installed to capture landfill leachate that
Landfill Leachate Flows
flowed to the EAB to redirect leachate to the recently installed
plant wastewater treatment system.
Source Area
Modifications to the EAB main dam, in compliance with the Dam
Stabilization
Safety Law of 1967, included ash sluice pipe removal and
abandonment of the pipe culvert at the EAB main dam.
To limit infiltration of precipitation into the unlined portion of the
Source Control
industrial landfill, the Closure Plan was revised to include an
engineered cap system. Approximately 4.38 acres of the halo area
was closed with an engineered cap system in May 2019.
Prepared by: KTL Checked by: CDE
Page 1 of 1

TABLE 6-3
SOIL PSRG POG STANDARD EQUATION PARAMETERS AND VALUES
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Csoil = cgw [Kd + (ew + eaH')/Pb]df
Inorganic
Parameter Definition
Default Values
Units
Parameters
Csoii
Calculated source concentrations for soil
NA
mg/kg
CgW
Applicable groundwater target concentration:
15A NCAC 02L Standard
mg/L
15A NCAC 02L Standard
df
Dilution factor'
20
unitless
Kd
Soil -water partition coefficient for inorganics
Constituent Specific
p
L k
/ 9
(range) 4
9W
Water -filled soil porosity vadose soilsz
0.3
Lwater/Lsoii
ea
Air -filled soil porosity - vadose soils3
0.13
Lair/Lsoii
Pb
Dry bulk density2
1.6
kg/L
Henry's law constant -dimensionless where: H'
H'
= Henry's law constant (atm - m3/mole) x
Constituent Specific3,5
unitless
conversion factor of 41
Prepared by: KTL Checked by: CDE
Notes:
' - Default value from Soil Screening Guidance: Technical Background Document (USEPA, 1996)
z - Site specific value (Murdoch et al., 2019). Effective porosity represents unconsolidated material.
3 - DEQ default value appropriate for North Carolina
4 - Constituent Specific- Soil water partition coefficients (Kd) were obtained from the Groundwater Quality
Signatures for Assessing Potential Impacts from Coal Combustion Product Leachate (EPRI, 2012). Sulfate Kd
ranges from 0.1 to 2.1, based on sands/sediments and a pH range of 4.6 to 7.2
5 - A value of 0 is used for sulfate
NA - Not applicable
NCAC - North Carolina Administrative Code
mg/kg - milligrams per kilogram
mg/L - milligrams per liter
L/kg - liters per kilogram
Lwater/Lsoii - volume of water filled spaces per volume of soil
Lair/LSoii - volume of air filled spaces per volume of soil
kg/L - kilograms per liter
Page 1 of 1

TABLE 6-4
SUMMARY OF UNSATURATED SOIL SAMPLE ANALYTICAL RESULTS - EAST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Parameters
pH
Antimony
Boron
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Vanadium
Reporting Units
S.U.
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
PSRG Protection of Groundwater
NE
0.9
45
3.8
0.9
150
65
7.1
2.1
1500
1938^
350
2018 Background Threshold Values'
4.4-9.7
0.6
2.9
11
11
27,147
532
2.8
1.60
39.2
11
69
2019 Background Threshold Valuesz
4.2-9.8
0.6
15
53
27
30,601
590
2.8
1.60
65.7
296
122
Sample ID
Sample
Collection Date
Analytical Results
Background
BGSB-02 (4-5)
07/18/2017
6.8
<0.48 M
<5.7 M
39 M
19
35,000 M
200 M
0.63 j,M
1.2 j
29 M
<11
120
BGSB-02 (7-8)
07/18/2017
7.4
<0.44
<2.5
4.5
5.5
7,100
46
<2
0.3 j
7.9
<11
31
BGSB-14 (2-3)
07/19/2017
6.0
<0.53
2.7
22
3.9
21,000
78
0.58j
0.31j
11
19
64
BGSB-14 (4-5)
07/19/2017
5.4
<0.53
1.2 j
9
6.6
22,000
97
0.61 j
0.53 j
16
28
54
BGSB-14 (7-8)
07/19/2017
6.1
<0.52
1.1 j
7.4
8.5
19,000
120
<2
0.57 j
31
<11
48
BGSB-14 (9-10)
07/19/2017
6.5
<0.47
<2.1
3.8
8
15,000
1 110
<1.7
0.74 j
29
<10
45
BGSB-18 (2-3)
07/19/2017
7.2
<0.5
<2.7
15
5
15,000
47
<2.1
0.65 j
9.9
7.6 j
47
BGSB-18 (4-5)
07/19/2017
7.1
0.21 j,B
<1.9
6.9
2.2
9,700
39
<1.5
0.37 j
4.6
<11
19
BGSB-18 (7-8)
07/19/2017
7.0
0.096 j,B
<2.9
4.3
3.3
12,000
82
<2.3
0.38 j
9
<12
20
BGSB-18 (9-10)
07/19/2017
7.7
<0.47
<2.4
5.2
4.3
9,900
73
<1.9
0.74 j
8.6
<11
30
BGSB-18 (12-13)
07/19/2017
8.8
<0.4
<2.1
1.8
1.6
7,200
61
<1.7
1
10
<10
9.6
BGSB-112 (2-3)
07/19/2017
5.5
<0.59
1.4j
4.3
4.6
21,000
160
0.62j
0.35j
7.7
13
43
BGSB-112 (4-5)
07/19/2017
5.7
<0.56
1.3 j
4.1
28
21,000
1 360
<2.1
1.1 j
10
<12
36
BGSB-112 (7-8)
07/19/2017
5.3
0.27 j,B
<2.4
4.1
8.7
14,000
110
<1.9
1.1 j
14
<11
39
BGSB-112 (9-10)
07/19/2017
7.6
<0.56
1.2j
2
14
23,000
310
<2.2
0.99j
21
<12
36
BGSB-112 (14-15)
07/19/2017
7.6
<0.54
<2.8
7.3
8.9
17,000
230
<2.2
0.33 j
23
<12
37
BGSB-112 (19-20)
07/19/2017
6.4
<0.43
0.98 j
3
7.1
15,000
270
<1.8
0.49 j
18
<11
32
MW-14BR (1-1.25)
02/25/2015
4.8
<1.2
<3.1
4.1
5.3
16,100
79.4
<0.62
<1.2
20.4
<300
45.2
MW-14BR (31-31.5)
02/25/2015
8.8
<1
<2.6
9
8.6
12,600
238
<0.51
<1
22.4
<254
31
MW-14BR (37.5-38)
02/25/2015
8.0
<1.1
<2.8
54
15.8
15,200
290
<0.55
<1.1
57.5
<286
33.3
MW-08 (14-16)
04/27/2015
7.6
<5.2
<13.1
0.82 j
4.6 j
10,200
222
<2.6
<5.2
13.7
<263
21.6
MW-08 (21-23)
04/27/2015
7.3
<5.7
<14.2
17.4
15.3
20,500
496
<2.8
<5.7
97.2
<283
43.1
MW-13BR (22-24)
03/04/2015
8.0
<1.2
9.2
8.7
8.1
1 13,100
132
<0.6
<1.2
13.2
<299
59.3
MW-17 (29-31)
04/21/2015
8.4
<5.1
17.9
4.8
5.7
19,800
315
<2.5
<5.1
18.8
<250
23
MW-18 (31-33)
05/16/2015
7.3
<6
<15
1.9
<6
7,000
353
<3
<6
8
<292
3.1j
MW-18 (37-38)
05/16/2015
7.3
<6.1
<15.3
1.3 j
<6.1
3,410
175
<3.1
<6.1
6.7
<296
<6.1
Page 1 of 3

TABLE 6-4
SUMMARY OF UNSATURATED SOIL SAMPLE ANALYTICAL RESULTS - EAST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Parameters
pH
Antimon,
Reporting Units
S.U.
mg/kg
PSRG Protection of Groundwater
NE
0.9
2018 Background Threshold Values'
4.4-9.7
0.6
2019 Background Threshold Valuesz
4.2-9.8
0.6
Sample ID
Sample
Collection Date
- Perimeter Soil Borings
O1 (1.5-2)
04/10/2019
5.1
<0.57
-02 (1.5-2)
04/10/2019
5.0
<0.53
03 (1.5-2)
04/10/2019
5.9
<0.57
04 (1.5-2)
04/10/2019
7.1
<0.53
O5 (1.5-2)
04/10/2019
5.6
<0.61
37 (1.5-2)
06/20/2019
6.5
<0.53 M
38 (1.5-2)
06/20/2019
6.3
<0.49
39 (1.5-2)
06/20/2019
5.0
<0.51
40 (1.5-2)
06/20/2019
4.6
<0.52
-41 (1.5-2)
06/19/2019
5.1
<0.5
-42 (1.5-2)
06/19/2019
5.5
<0.45
43 (1.5-2)
06/19/2019
5.0
<0.44
-44 (1.5-2)
06/19/2019
5.0
<0.45
45 (1.5-2)
06/19/2019
5.9
<0.68
46 (1.5-2)
06/20/2019
5.1
<0.46
-47 (1.5-2)
06/20/2019
5.7
<0.53
48 (1.5-2)
06/20/2019
6.5
<0.52
49 (1.5-2)
06/20/2019
5.2
<0.51
- Within Ash Basin Compliance Boundary
11BR (1.5-2)
03/04/2015
8.1
<1.3
02BR (2-2.5)
03/12/2015
6.8
<3.2
/-08R (6-7)
08/01/2018
6.6
<0.46
/-08R (10.5-11.5)
08/01/2018
7.5
<0.47
34D (2-4)
03/27/2019
7.3
<0.57
34D (8-9)
03/27/2019
6.9
<0.55
Boron
Chromium
Cobalt
mg/kg
mg/kg
mg/kg
45
3.8
0.9
2.9
11
11
15
53
27
1.5 j
23
10
1.4 j
12
7.5
1.6 j
15
9.1
1.3 j
12
8.6
1.7 j
16
16
<5.4
2.1
21
<4.9
21
5.5
1.6 j
6
6.1
1.1 j
8
5.9
1.4 j
11
10
<2.2
6.9
6.9
<2.2
9.4
12
1.3 j
13
10
<6.8
29
25
2.7
1.3
0.97
<5.3
37
12
2.1 j
19
9.6
<2.6
9.4
19
10.9
15.7
17.4
<16.2
SOS
15.8
<2.2
57
4.3
<4.6
13
7.4
5.7
59
11
<5.5
26
13
Iron
Manganese
Molybden
mg/kg
mg/kg
mg/kg
150
65
7.1
27,147
532
2.8
30,601
590
2.8
Analytical Results
16,000
490
<2.3
14,000
460
<2.1
14,000
S30
<2.3
17,000
190
<2.1
17,000
410
<2.4
8,000 M
380 M
<2.2
37,000
98
<1.9
11,000
320
<2
22,000
310
<2.1
20,000
200
<2
12,000
270
<1.8
21,000
300
<1.8
12,000
670
<1.8
45,000
660
<2.7
4,700
20
1.2j
31,000
320
<2.1
24,000
310
0.99 j
24,000
380
<2.1
15,500
530
<0.64
18,500
545
<0.65
22,000
150
9.9
27,000
280
<1.8
25,000
330
<2.3
35,000
500
<2.2
Selenium
Strontium
Sulfate
Vanadium
mg/kg
mg/kg
mg/kg
mg/kg
2.1
1500
1938^
350
1.60
39.2
11
69
1.60
65.7
296
122
0.61j
7.6
8.7j
1 45
<1.4
13
<13
33
<1.5
15
<13
42
<1.4
18
37
40
<1.6
14
7 j
55
0.57j
71 M
41
90
<1.3
4.5
59
74
<1.3
6.6
21
24
<1.4
12
32
35
<1.3
13
26
45
<1.2
12
6.8 j
24
0.41 j
17
29
44
<1.2
8.9
29
28
0.85j
69
<14
84
<1.2
8.7
28
5.3
<1.4
32
23
70
1j
38
1200
57
<1.3
26
56
49
<1.3
17.7
<316
55.3
<3.2
27.5
<321
123
<1.2
16
<11
29
<1.2
25
<11
42
<1.5
54
130 M
54
<1.4
62
8 L--j
100
Page 2 of 3

TABLE 6-4
SUMMARY OF UNSATURATED SOIL SAMPLE ANALYTICAL RESULTS - EAST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Parameters
pH
Antimony
Boron
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Vanadium
Reporting Units
S.U.
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
PSRG Protection of Groundwater
NE
0.9
4S
3.8
0.9
150
65
7.1
2.1
SS00
1938^
3S0
2018 Background Threshold Values'
4.4-9.7
0.6
2.9
11
11
27,147
532
2.8
1.60
39.2
11
69
2019 Background Threshold Valuesz
4.2-9.8
0.6
15
S3
27
30,601
S90
2.8
1.60
65.7
296
122
Sample ID
Sample
Collection Date
Analytical Results
EAB - Outside Ash Basin Compliance Boundary
MW-01BR (0-2)
03/26/2015
7.1
<3.5
<3.5
4.2
13.1
14,800
289
<0.71
<3.5
20.3
<339
58.8
MW-01BRL (4-5)
O1/08/2019
7.2
<0.47 M
<4.7
6.3
10
28,000 M
440 M
<1.9
<1.2
28
24
73 M
MW-03BR (0-2)
05/13/2015
6.5
<5.9
15.9
13.8
13.5
17,200
405
<2.9
<5.9
31.8
4920
60.5
MW-03BR (21-23)
05/13/2015
7.7
<5
<12.6
46.6
12.5
16,100
211
<2.5
<5
36.9
<247
43.7
MW-13BR (0-2)
03/04/2015
4.8
<1.3
8.9
4.2
1.9
13,200
51.5
<0.65
<1.3
4.4
<322
30.4
MW-16 (0-2)
04/06/2015
7.7
<6
<14.9
10.6
20.7
1 23,700
168
<3
<6
23.2
<290
43.6
Prepared by: KTL Checked by: IRS
Notes:
' - Background threshold values were calculated using data from background unsaturated soil samples collected February 2015 to July 2017.
z - Updated background threshold values were calculated using data from background unsaturated soil samples collected February 2015 to July 2017. The background threshold value updates retained extreme outlier
concentrations in background unsaturated soil datasets (SynTerra, 2019).
Background data set includes sample locations from the East Ash Basin and West Ash Basin.
- bold highlighted concentration indicates value is greater than applicable regulatory standard (PSRG POG).
- bold highlighted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory
standard.
PSRG - Preliminary Soil Remediation Goals for the Protection of Groundwater (POG); North Carolina Department of Environmental Quality (NCDEQ) Inactive Hazardous Sites Branch (IHSB) Preliminary Soil
Remediation Goals table (February 2018)
< - Concentration not detected at or above the adjusted reporting limit.
^ - PSRG Protection of Groundwater value was calculated using the equation shown in Section 6.
mg/kg - milligrams per kilogram
B - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample is less than 1OX the concentration in the method blank. Analyte concentration in sample
could be due to blank contamination.
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
M - Matrix spike / matrix spike dup failure.
NE - Not established
S.U. - Standard Units
Page 3 of 3

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO APRIL 2019 - EAST ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Results
pH
Antimony
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Total Dissolved
Solids
Total Uranium
Vanadium
Reporting Units
S.U.
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
mg/L
pg/mL
pg/L
15A NCAC 02L Standard
6.5 - 8.5
1*
700
NE
10
1*
300
50
NE
20
NE
250
500
NE
0.3*
2017 Background Threshold Values (Transition Flow Zone)'
6.3 -7.6
1
50
17
25
1
1210
405
4
2
760
37
540
0.005
30
2019 Background Threshold Values (Transition Flow Zone )2
6.3 -7.6
1
50
12
22
3
1293
260
8
2
760
38
710
0.004
23
2019 BTVs Data Set Range (Transition Flow Zone)2
6.3 - 7.6
< 1 - < 1
< 50 - < 50
1.60 - 13.1
1.26 - 42.7
< 1 - 4.01
12 - 1760
<5 - 820
< 1 - 9.9
< 1 - 3.57
221 - 782
11 - 48.1
248 - 750
<0.0002 - 0.00381
0.983 - 24.4
2017 Background Threshold Values (Bedrock Flow Zone)'
6.8-8.3
1
50
0.2
4
6
4227
1198
35
1
232
74
530
0.003
2
2019 Background Threshold Values (Bedrock Flow Zone )2
6.1 - 8.3
1
50
1
4
18
5130
1773
22
1
438
69
560
0.006
3
2019 BTVs Data Set Range (Bedrock Flow Zone )2
6.1 - 8.3
< 1 - < 1
< 50 - < 50
<0.025 - 1.7
< 1 - 9.27
< 1 - 21.7
< 10 - 6220
<5 - 1510
< 1 - 24.3
< 1 - 1.19
64 - 615
0.18 - 77
170 - 820
<0.0002 - 0.00605
<0.3 - 3.03
Sample ID 7 Flow Zone
Mean Result3
Background Locations
BG-01
Transition
6.4
< 1
< 50
2.8
3.2
< 1
61.5
< 5
< 1
< 1
458
17.2
334
0.00055
18.3
BG-01BR
Bedrock
6.9
< 1
< 50
0.1
1.2
< 1
53.3
224
2.3
< 1
177
17.6
310
0.00082
2.1
BG-02BR
Bedrock
8.1
< 1
< 50
0.0
1.6
< 1
97.2
49.5
12.7
< 1
262
33.0
322
0.0031
0.35
CCR-112BR-BG
Bedrock
6.4
< 1
< 50
-
< 1
< 1
-
-
7.3
< 1
-
19
193
-
-
MW-10BR
Bedrock
6.9
< 1
< 50
0.2
< 1
14.6
11.5
187
11.0
< 1
173
39.6
330
0.0026
2.9
MW-14BR
Bedrock
7.2
< 1
< 50
< 0.025
1.1
3.1
1530
360
2.7
< 1
181
12.8
362
0.00025
0.28
MW-15BR
Bedrock
7.6
< 1
< 50
0.1
< 1
< 1
579
35.6
11.0
< 1
124
32.0
345
0.00067
0.27
MW-15D
Transition
6.6
< 1
< 50
3.0
2.9
< 1
40.0
< 5
< 1
< 1
236
29.3
398
0.00066
10.0
MW-18BR
Bedrock
7.9
< 1
< 50
< 0.025
< 1
1.3
1140
777
3.7
< 1
473
12.4
505
0.00048
< 0.3
MW-18D
Transition
7.0
< 1
< 50
7.3
6.8
< 1
112
52.0
2.7
< 1
652
32.1
579
0.0031
1.3
MW-19BRL
Bedrock
7.0
< 1
< 50
< 0.025
< 1
< 1
3928
1454
2.9
< 1
252
18.0
466
< 0.0002
0.35
MW-26BR
Bedrock
7.2
< 1
< 50
< 0.025
< 1
< 1
1950
542
15.4
< 1
259
66.8
512
-
0.32
MW-29BR
Bedrock
7.3
< 1
< 50
0.05
< 1
< 1
274
110
2.1
< 1
152
12.2
280
-
0.40
MW-30BR
Bedrock
6.9
< 1
< 50
< 0.025
< 1
< 1
2174
1074
4.8
< 1
301
62.7
477
-
0.25
Near or Within the Waste Boundary Locations
ABMW-044
Ash Pore Water
5.6
< 1
45000
< 0.025
< 1
6.41
71500
12300
774
< 1
9140
2200
3800
0.0241
1.63
ABMW-04BR4
Bedrock
6.2
< 1
< 50
< 0.025
0.711 j
< 1
3710
1570
4.9
< 1
183
20
230
0.000117 j
0.635
ABMW-05
Ash Pore Water
7.4
< 1
25600
< 0.025
< 1
1.5
3728
1710
2828
< 1
4810
1300
2250
0.0062
0.59
ABMW-05D
Transition
7.1
< 1
2870
< 0.025
< 1
< 1
32780
6308
14.3
< 1
498
13.1
252
< 0.0002
0.72
ABMW-06
Ash Pore Water
7.3
< 1
3014
0.030
< 1
< 1
1035
975
7.3
< 1
9924
169
738
-
1.4
ABMW-06BR
Bedrock
6.7
< 1
< 50
0.028
< 1
< 1
74.8
720
2.1
< 1
208
61.4
332
-
0.39
ABMW-07BR
Bedrock
6.9
< 1
1624
0.03
< 1
1.2
186
498
1.2
< 1
242
116
428
-
0.42
ABMW-07BRL
Bedrock
7.6
< 1
168
0.027
< 1
< 1
224
63.6
5.5
< 1
796
244
532
-
< 0.3
ABMW-07BRLL4
Bedrock
7.8
< 1
137
< 0.025
0.592 j
< 1
460
64
2.52
< 1
634
90
400
0.00164
0.497
CCR-100BR
Bedrock
7.1
< 1
< 50
-
< 1
< 1
-
-
6.1
< 1
-
27.8
440
-
-
CCR-100D
Transition
7.0
< 1
< 50
-
< 1
< 1
-
-
1.9
< 1
-
22.5
423
-
-
CCR-101BR
Bedrock
7.2
< 1
< 50
-
< 1
< 1
-
-
2.4
< 1
-
19
405
-
-
CCR-101D
Transition
6.8
< 1
< 50
-
< 1
31
-
-
2.1
< 1
-
3.3
343
-
-
CCR-102BR
Bedrock
6.5
< 1
< 50
-
< 1
< 1
-
-
2.5
< 1
-
370
813
-
-
CCR-103BR
Bedrock
7.1
< 1
3883
-
< 1
< 1
-
-
< 1
1.4
-
700
1275
-
-
CCR-104BR4
Bedrock
6.8
< 1
7700
-
0.572 j
< 1
-
-
5.43
15.8
-
1100
1900
-
-
CCR-105BR
Bedrock
6.7
< 1
610
-
< 1
< 1
-
-
1.8
12.2
-
243
600
-
-
CCR-106BR
Bedrock
6.7
< 1
1463
-
< 1
< 1
-
-
1.4
< 1
-
380
933
-
-
CCR-107BR
Bedrock
6.2
< 1
3552
0.057
< 1
< 1
3.7
3.7
< 1
< 1
894
306
616
0.00012
12.5
CCR-108BR
I Bedrock
6.6
1 < 1
1 11360
1 0.086
1 < 1
< 1
< 10
74
224
23.9
1490
1044
2020
0.0055
6.3
Page 1 of 3

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO APRIL 2019 - EAST ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Results
y
pH
Antimony
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Total Dissolved
Solids
Total Uranium
Vanadium
Reporting Units
S.U.
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
mg/L
pg/mL
pg/L
15A NCAC 02L Standard
6.5 - 8.5
1*
700
NE
10
1*
300
50
NE
20
NE
250
500
NE
0.3*
2017 Background Threshold Values (Transition Flow Zone)'
6.3 -7.6
1
50
17
25
1
1210
405
4
2
760
37
540
0.005
30
2019 Background Threshold Values (Transition Flow Zone )2
6.3 -7.6
1
50
12
22
3
1293
260
8
2
760
38
710
0.004
23
2019 BTVs Data Set Range (Transition Flow Zone)2
6.3 - 7.6
< 1 - < 1
< 50 - < 50
1.60 - 13.1
1.26 - 42.7
< 1 - 4.01
12 - 1760
<5 - 820
< 1 - 9.9
< 1 - 3.57
221 - 782
11 - 48.1
248 - 750
<0.0002 - 0.00381
0.983 - 24.4
2017 Background Threshold Values (Bedrock Flow Zone)'
6.8 - 8.3
1
50
0.2
4
6
4227
1198
35
1
232
74
530
0.003
2
2019 Background Threshold Values (Bedrock Flow Zone )2
6.1 - 8.3
1
50
1
4
18
5130
1773
22
1
438
69
560
0.006
3
2019 BTVs Data Set Range (Bedrock Flow Zone )2
6.1 - 8.3
< 1 - < 1
< 50 - < 50
<0.025 - 1.7
< 1 - 9.27
< 1 - 21.7
< 10 - 6220
<5 - 1510
< 1 - 24.3
< 1 - 1.19
64 - 615
0.18 - 77
170 - 820
<0.0002 - 0.00605
<0.3 - 3.03
Sample ID 7 Flow Zone
I Mean Result3
Near or Within the Waste Boundary Locations (Continued)
CCR-109BR
Bedrock
6.6
< 1
1305
-
< 1
< 1
-
-
2.9
< 1
-
513
1200
-
-
CCR-110BR
Bedrock
6.2
< 1
17675
-
< 1
7.1
-
-
2082
47.7
-
1028
1713
-
-
CCR-111BR
Bedrock
6.6
< 1
4263
-
1.0
< 1
-
-
1.7
171
-
650
1450
-
-
GMW-01A
Transition
6.7
< 1
113
-
< 1
2.0
-
-
< 1
4.9
-
69.5
373
-
-
GMW-02
Transition
6.7
< 1
5400
-
< 1
< 1
-
-
< 1
3.4
-
865
1500
-
-
GMW-06
Transition
6.5
< 1
2525
0.77
1.0
< 1
37.0
12.6
< 1
58.1
1074
659
1250
0.0023
4.2
GMW-07
Bedrock
6.6
< 1
2800
0.25
1.2
< 1
61.1
< 5
1.6
13.0
835
346
1148
-
6.7
GMW-084
Bedrock
6.5
< 1
3910
0.036
3.2
< 1
42
52
3.3
< 1
909
480
1400
-
2
GMW-08R
Bedrock
6.6
< 1
3444
0.099
< 1
0.705
26.9
213
13.0
< 1
911
420
1320
0.015
2.2
GMW-09
Bedrock
6.2
< 1
< 50
0.13
< 1
< 1
49.2
< 5
< 1
< 1
100
23.9
170
-
3.8
GMW-10
Bedrock
6.0
< 1
124
0.17
< 1
< 1
92.6
6.7
< 1
3.2
141
48.9
211
-
2.8
GMW-11
Bedrock
6.5
< 1
2958
0.28
< 1
< 1
64.7
< 5
0.85
106
503
454
932
-
6.5
MW-02BR4
Bedrock
6.2
< 1
< 50
< 0.025
< 1
3.7
20200
1450
1.96
< 1
599
47
520
-
< 0.3
MW-03BR
Bedrock
6.7
< 1
2744
0.027
< 1
1.3
186
48.4
< 1
2.5
1518
1360
2300
0.040
15.8
MW-11BR
Bedrock
6.7
< 1
< 50
0.15
< 1
< 1
16.5
37.4
2.7
< 1
182
41.3
321
0.00067
5.0
MW-11D
Transition
6.4
< 1
< 50
0.028
< 1
5.1
135
1228
1.4
< 1
329
37
300
0.00012
3.2
MW-20BRL
Bedrock
7.4
< 1
< 50
0.026
< 1
< 1
78.6
412.4
1.1
< 1
200
12.5
257
-
< 0.3
MW-21BRLR
Bedrock
7.4
< 1
65.7
0.026
< 1
< 1
65.1
137
19.5
< 1
523
107
508
0.0058
1.1
MW-23BRR
Bedrock
6.9
< 1
< 50
< 0.025
< 1
< 1
54.4
29
2.3
< 1
140
15.7
263
-
0.92
MW-24BR
Bedrock
7.8
1.1
< 50
0.040
1.9
< 1
431
126
10.3
< 1
1682
64.4
290
-
0.32
MW-35BR4
Bedrock
7.3
< 1
937
0.064
0.339 j
0.528 j
222
102
5.15
0.51 j
347
220
570
0.0037
0.795
MW-35D4
Transition
6.4
< 1
8150
0.16
0.546 j
0.411 j
216
84
2.09
40.6
873
700
1410
0.00554
7.7
MW-35S4
Shallow
6.4
< 1
8270
0.17
0.607 j
0.774 j
127
97
0.968 j
37
1370
830
1320
0.00134
13.8
MW-37BR4
Bedrock
7.6
< 1
4200
0.38
0.775 j
< 1
14
132
1.04
25.5
624
490
200
0.00239
2.18
MW-37D4
Transition
6.2
< 1
506
0.3
1.01
0.434 j
254
25
0.197 j
9.69
735
430
722
0.000638
5.44
MW-37S4
Shallow
6.1
< 1
416
0.061 M1
< 1
0.508 j
13
70
2.41
12.5
898
570
1070
0.00116
7.06
MW-108BRL4
Bedrock
6.8
< 1
22700
< 0.025
0.571 j
13.4
741
2530
1450 M4
< 1
2020
1900
3030
0.00345
1.33
MW-108BRLL4
Bedrock
7.8
0.517 j
4770
0.097
0.584 j
< 1
188
225
261
< 1
414
400
927
0.00745
0.802
Near or Beyond the Compliance Boundary Locations
CCR-113BR
Bedrock
7.0
< 1
< 50
< 0.025
1.0
< 1
318
40.3
2.0
< 1
193
140
478
-
1.6
CCR-113D
Transition
6.7
< 1
< 50
0.10
0.55
< 1
237
35.5
0.59
< 1
260
122
434
-
3.3
CW-01
Bedrock
6.1
< 1
< 50
0.032
< 1
< 1
96.8
66.4
< 1
< 1
458
101
436
0.00039
23.2
GPMW-01BR
Bedrock
6.5
< 1
1554
< 0.025
< 1
< 1
817
137
3.5
< 1
1230
1120
1720
-
0.64
GPMW-01D
Transition
6.5
< 1
1101
< 0.025
< 1
< 1
58.8
61
< 1
< 1
1476
1133
1733
4.0
GPMW-01S
Shallow
6.2
1 < 1
1 1802
1 0.026
1 < 1
1 10.1
1 206
3232
< 1
< 1
2482
1186
1760
4.9
Page 2 of 3

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO APRIL 2019 - EAST ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Results
y
pH
Antimony
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Total Dissolved
Solids
Total Uranium
Vanadium
Reporting Units
S.U.
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
mg/L
pg/mL
pg/L
15A NCAC 02L Standard
6.5 - 8.5
1*
700
NE
10
1*
300
50
NE
20
NE
250
500
NE
0.3*
2017 Background Threshold Values (Transition Flow Zone)'
6.3 - 7.6
1
50
17
25
1
1210
405
4
2
760
37
540
0.005
30
2019 Background Threshold Values (Transition Flow Zone )2
6.3 - 7.6
1
50
12
22
3
1293
260
8
2
760
38
710
0.004
23
2019 BTVs Data Set Range (Transition Flow Zone)2
6.3 - 7.6
< 1 - < 1
< 50 - < 50
1.60 - 13.1
1.26 - 42.7
< 1 - 4.01
12 - 1760
<5 - 820
< 1 - 9.9
< 1 - 3.57
221 - 782
11 - 48.1
248 - 750
<0.0002 - 0.00381
0.983 - 24.4
2017 Background Threshold Values (Bedrock Flow Zone)'
6.8 - 8.3
1
50
0.2
4
6
4227
1198
35
1
232
74
530
0.003
2
2019 Background Threshold Values (Bedrock Flow Zone )2
6.1 - 8.3
1
50
1
4
18
5130
1773
22
1
438
69
560
0.006
3
2019 BTVs Data Set Range (Bedrock Flow Zone )2
6.1 - 8.3
< 1 - < 1
< 50 - < 50
<0.025 - 1.7
< 1 - 9.27
< 1 - 21.7
< 10 - 6220
<5 - 1510
< 1 - 24.3
< 1 - 1.19
64 - 615
0.18 - 77
170 - 820
<0.0002 - 0.00605
<0.3 - 3.03
Sample ID 7 Flow Zone
I Mean Result3
Near or Beyond the Compliance Boundary Locations (Continued)
GPMW-02BR
Bedrock
6.5
< 1
2492
< 0.025
< 1
< 1
232
1074
< 1
< 1
1290
1140
1980
-
1.5
GPMW-02D
Transition
6.7
< 1
< 50
< 0.025
< 1
7.2
96840
9604
1.4
< 1
930
610
1100
-
0.69
GPMW-03BR
Bedrock
7.4
< 1
227
< 0.025
< 1
< 1
215
43.4
3.5
< 1
861
486
750
-
0.39
GPMW-03D
Transition
5.9
< 1
1345
0.046
< 1
4.0
284
602
< 1
57.8
1670
1220
1820
-
1.7
MW-01BR
Bedrock
6.6
< 1
1952
0.071
2.6
1.5
409
547
< 1
9.1
530
138
664
-
16.4
MW-01BRL4
Bedrock
6.9
< 1
24.064 j
< 0.025
0.436 j
< 1
1420
1480
1.26
< 1
337
87
594
0.000654
0.367
MW-13BR
Bedrock
6.2
< 1
< 50
0.072
< 1
2.0
117
141
1.6
< 1
424
33.8
386
0.00013
6.3
MW-16BR
Bedrock
6.8
< 1
< 50
0.098
< 1
< 1
23.7
22.2
0.89
< 1
161
23.3
283
0.0011
3.0
MW-17BR
Bedrock
7.2
< 1
< 50
0.047
< 1
< 1
593
252
2.7
< 1
887
36.9
371
0.00025
0.31
MW-22BR
Bedrock
6.5
< 1
787
0.032
< 1
5.9
74.4
567
4.1
7.7
584
538
936
-
0.98
MW-22D
Transition
6.1
< 1
487
< 0.025
< 1
5.3
12.2
1466
< 1
47.2
1361
960
1560
-
4.1
MW-25BR
Bedrock
7.1
< 1
< 50
< 0.025
2.5
< 1
2225
583
4.6
< 1
1768
97.8
575
-
0.29
MW-27BR
Bedrock
7.3
< 1
< 50
< 0.025
1.2
< 1
645
274
1.5
< 1
303
260
634
-
< 0.3
MW-28BR
Bedrock
7.5
< 1
50.4
0.029
1.6
< 1
621
219
6.6
< 1
326
69
408
-
0.98
MW-34BR4
Bedrock
7.1
< 1
1200
0.07
< 1
0.417 j
168
53
1.65
2
628
590
1140
0.0071
1.54
MW-34D4
Transition
6.7
< 1
537
0.42
0.654 j
< 1
82
8
0.667 j
23.3
662
800
1240
0.0038
6.48
MW-36BR4
Bedrock
6.9
< 1
996
<0.025
0.357 j
0.483 j
136
34
2.12
2.22
855
950
1690
0.0105
0.946
MW-36D4
Transition
6.6
< 1
1220
0.041
< 1
0.378 j
26
180
2.4
27.2
786
1300
2000
0.00441
10.8
Notes:
1 - Background threshold values were calculated using data from background groundwater samples collected November 2010 to January 2017.
Z Background threshold values were calculated using data from background groundwater samples collected November 2010 to November 2018.
s - Statistical mean calculated from data ranging from January 2018 to June 2019. Ash pore water results are not compared to groundwater standards or criteria.
4- Wells with datasets containing fewer than four valid results, the most recent valid sample data up to June 2019 was used.
Mean values have been rounded to similar levels of precision as 15A North Carolina Administrative Code (NCAC) 02L Standard or Interim Maximum Allowable Concentration (IMAC).
Background values have not been established for the shallow flow zone at this time, therefore, data sets are compared to transitional flow zone criteria for comparison purposes only.
Mean or geomean results were used based on the central tendency of the data set.
Means were calculated for wells with four or more valid sample results. Sample results were excluded from calculations:
1) if turbidity >10 NTU (for COIs other than boron)
2) for unusable data (RO qualified)
3) if a result was non -detect at a reporting limit (RL) greater than the normal laboratory RL
0 bold highlighted concentration indicates value is greater than the 15A NCAC 02L .0202 Standard or the IMAC. (Effective date for 15A NCAC 02L .0202 Standard and IMAC is April 1, 2013)
0 bold highlighted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory standard
O - highlighted concentration indicates value is within range of background threshold values for constituents where there is no regulatory standard, or background threshold values are greater than regulatory standard
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
< - concentration not detected at or above the adjusted reporting limit.
no available data to conduct mean analysis
BTVs - Background Threshold Values
COIs - Constituents of Interests
NE - not established
NTUs - Nephelometric Turbidity Units
mg/L - milligrams per liter
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
M1 - Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable.
M4 - The spike recovery value was unusable since the a-lyte concentration in the sample was disproportio-te to the spike level.
pCi/L - picocuries per liter
Ng/L - micrograms per liter
RO - The data are unusable. The sample results are rejected due to serious deficiencies in meeting QC criteria. The analyte may or may not be present in the sample.
S.U. standard unit
Prepared by: KTL Checked by: TAW
Page 3 of 3

TABLE 6-6
COI MANAGEMENT MATRIX - EAST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
MVIR
Constituent
R
Standards
'''
and values - 02L
Criterion
GPMW-IS
Lines of
Evidence (LOE)
- 02L Criterion
Rationale - 02L Criterion
Shallow
NE
NE
NE
1,802
2.6
1
NA
1
1
Y
Multiple locations with means greater than 02L near or beyond the compliance
Transition Zone
50
50
<50
1,345
1.9
3
3
3
3
Y
Boron
700 (pg/L)
<50
50 - 176.8
GPMW-SD, GPMW-3D, MW-36D V
Conservative
boundary and which exhibit a discernable plume. Boron is mapped as primary COI
migration indicator parameter for transition zone and bedrock groundwater for CAP
evaluation.
Bedrock
50
50
<50
2,492
3.6
6
6
6
6
Y
GPMW-1BR, GPMW-2BR, MW-1BR,
MW-22BR, MW-34BR, MW-36BR
Shallow
NE
NE
NE
<1
NA
0
NA
0
0
N
Chromium (Total)
10 (pg/L)
<1 - 42.7
1 - 26
N
Variable
No means greater than comparison criteria near or beyond the compliance boundary.
Does not warrant corrective action.
Transition Zone
25
22
1.26 - 42.7
0.654
0.03
0
0
0
0
N
Bedrock
4
4
<1 - 9.27
2.6
0.3
0
0
0
0
N
Shallow
NE
NE
NE
206
0.7
0
NA
0
0
N
Single location (GPMW-2D) with mean greater than background value and does not
Iron
300 (pg/L)
Transition Zone
1210
1293
12 - 1760
<10 - 6220
56.3 - 37500
96,840
80.0
1
GPMW-2D Y
1
1
1
Y
Variable
exhibit a discernable plume. Boron reported less than reporting limit at GPMW-2D.
Does not warrant corrective action.
Bedrock
4227
5130
<10 - 6220
2,225
0.4
0
0
0
0
N
GPMW-1S
Shallow
NE
NE
NE
3,232
64.6
1
NA
1
0
y
GPMW-31) and MW-22D within Site -specific background range. GPMW-2D with mean
Transition Zone
405
260
<5 - 820
9,604
36.9
3
2
1
1
Y
Manganese
50 (pg/L)
<5 - 1510
7 - 9170
GPMW-2D, GPMW-3D, MW-22D Y
Variable
greater than Site -specific and piedmont background range; does not exhibit a
discernable plume. Boron reported less than reporting limit at GPMW-2D. Does not
warrant corrective action.
Bedrock
1198
1773
'5- 1510
1,480
0.83
0
0
0
0
N
Shallow
NE
NE
NE
<1
NA
0
NA
0
0
N
90
Mean concentrations greater than 02L north of the EAB along the compliance
Selenium
20 (pg/L)
Transition Zone
2
2
<1 - 3.57
<1 - 3.57
0.5 - 2.4
57.8
2.9
4
GPMW-3D, MW-22D, MW-34D, MW-36D N
4
4
4
V
Variable
boundary. Area which exhibits a discernable plume is limited and within COI -affected
groundwater plume depicted for conservative constituents.
Bedrock
1
1
<1 - 1.19
9.1
0.46
0
0
0
0
N
GPMW-15
Shallow
NE
NE
NE
1,186
4.7
1
NA
1
1
Y
Sulfate
250 (mg/1)
0.18 - 77
1.2 - 510
GPMW-ID, GPMW-2D, GPMW-3D, MW-22D, y
MW-34D, MW-36D
Conservative
Multiple locations with means greater than 02L near or beyond the compliance
boundary and which exhibit a discernable plume.
Transition Zone
37
39
11 - 48.1
1,300
5.2
6
6
6
5
Y
Bedrock
74
69
0.18-77
1,140
4.6
7
7
7
5
Y
GPMW-1BR, GPMW-2BR, GPMW-3BR,
MW-22BR, MW-27BR, MW-34BR, MW-36BR
Shallow
NE
NE
NE
1,760
3.5
1
GPMW-15
NA
1
1
y
Total Dissolved Solids
500 (mg/1)
<170 - 820
SO- 1200
y
Conservative
Multiple locations with means greater than 02L near or beyond the Compliance
boundary and which exhibit a discernable plume.
Transition Zone
540
710
248 - 750
2,000
2.8
6
GPMW-1D, GPMW-2D, GPMW-3D,
MW-22D, MW-34D, MW-36D
6
6
5
Y
GPMW-1BR, GPMW-2BR, GPMW-3BR, MW-IBR,
Bedrock
530
560
170 - 820
1,980
3.5
10
MW-1BRL, MW-22BR, MW-25BR, MW-27BR,
5
5
3
Y
MW-34BR, MW-36BR
Constituent Standards and Values - IMAC Criterion
Lines of Evidence (LOE) - IMAC Criterion
Rationale - IMAC Criterion
Shallow
NE
NE
NE
<1
NA
0
NA
0
0
N
Antimony
1 (pg/L)
<1
0.5 - 2.9
N
Conservative
No means greater than comparison criteria near or beyond the compliance boundary.
Does not warrant corrective action.
Transition Zone
1
1
<1
<1
NA
0
0
0
0
N
Bedrock
1
1
<1
<1
NA
0
0
0
0
N
Shallow
NE
NE
NE
10.1
10.1
1
GPMW-1S
NA
0
0
Y
Cobalt concentrations at GPMW-2D, GPMW-3D, and MW-22D within Site -specific
Cobalt
1 (pg/L)
Transition Zone
1
3
< 1 - 4.01
<1 - 21.7
0.088 - 88.85
7.2
2.4
3
GPMW-2D, GPMW-3D, MW-22D
Y
3
0
0
Y
Variable
background range. Boron reported less than reporting limit at GPMW-2D. Does not
warrant corrective action
Bedrock
6
18
< 1- 21.7
5.9
0.3
0
0
0
0
N
Shallow
NE
NE
NE
4.9
16.3
1
GPMW-1S
NA
0
0
Y
MW-13BR and MW-16BR positioned hydraulically upgradient from EAB. Vanadium
Vanadium
0.3 (pg/L)
Transition Zone
30
23
0.983 - 24.4
<0.3 - 24.4
0.33 - 25.8
10.8
0.5
0
N
0
0
0
N
Non -Conservative
concentrations at CW-1, MW-1BR, MW-13BR, and MW-16BR within Site -specific
background range. Does not warrant corrective action
Bedrock
2
3
<0.3 - 3.03
23.2
7.7
4
CW-1, MW-1BR, MW-13BR, MW-16BR
4
0
0
Y

TABLE 6-6
COI MANAGEMENT MATRIX - EAST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Roxboro Steam Number of
02L or IMAC Groundwater Roxboro Steam Electric Plant Piedmont Maximum Mean Wells Above
Zone Statistically Electric Plant ackground Concentration Near Groundwater Monitoring Wells with COI
Constituents of Criterion Background Exceedance Criterion
Derived Back ound Valuez'a Flow Layer Range or Beyond Concentrations Greater than Comparative
Interest' (Reporting gr Dataset Range Ratio' Near or Beyond of
ckground Da (All Flow Compliance Criteria
Unit) (All Flow p Compliance
Set Range Zones) Zones) Boundary Boundary
Constituent Standards and Values - Background Criterion
Flow Zone 20� J ihe
c
e e a 6
ce �a ac a c ° a Rationale for Selection
Qo a tia y d'r$1 yl ae ya Aa Os' Ja cfJa't♦� ec ♦��� of COIs for Corrective Action Evaluation
yr °� Gc o< 'ti 19 a° h° tia Qa as F° o,<° of a"i `�� o�
P pV,�a Q cA o e 3A pa e 9 ? ea c`I' e a ° �`
.c c ,° y♦` a 't' F' ♦o a 0 d oa Q� y 0 eC Oc ,ta ♦ (consituents where no means are greater than
.r.` tie ca a °° ce � F a O 9� a y 0 aC J♦ Lo comparative
ea a a of �a J Q sy o� 9 to J U Q' a. et4 F criteria in all flow zones and/or multiple lines
ey FQ as F` lP ea A< ea ea ec OA a a'�• a of evidence support that constituent occurrences are not related
Qt �`�a tc° (p}mac} }cegao �Qc°,p<Gc° GP°,c to the source area, no corrective action is warranted)
1111 Jill 11111111 11111111 11111111111111 liplill I lJJl�Jll�iii I I Rationale - Background Criterion
Chromium (Hexavalent)
0
No means greater than c-crinnflance boundary.
No means greater than C_
=MOM
®®0
000©
EMMMME
Mean concentrations greater than 02L north of the EAB along the compliance
groundwater plume depicted for conservative constituents.
GPMW-ID, GPMW-2D, GPMW-3D,
CW-1, GPMW-IBR, GPMW-2BR, GPMW-3BRI
0.00605ttM
-. •- -compliance boundary.
- - - .. - Do
®
t tt
®
t ttr r rr.r
t t t
®©:•
.:•
Notes:
0 - Reference Criterion
0 - Evidence supports Inclusion
- Evidence supports exclusion
- Constituent Ilst rec
eflts the constituents of Interest identified In the 2017 CSA Update (SynTerm, 2017).
- Background values were calculated using data from background groundwater samples collected November 2010 to January 2017.
s - Updated background values were calculated using data from background groundwater samples collected November 2010 to November 2018.
° - The exceedance ratio is the ratio of the observed constituent concentration divided by the reference criterion.
s - Assignment of conservative, non -conservative, or variable behavior Is based on geochemlcal modeling results.
< - less than
Notes:
APW - ash pore water
COI - constituent of interest
CSA - Comprehensive Site Assessment
pg/L - micrograms per liter
mg/L - milligrams per liter
NA - Not Applicable
NE - Not Established
y - yes
N - No
Prepared by: KTL Checked by: TAW

TABLE 6-7
SUMMARY OF TREND ANALYSIS RESULTS FOR GROUNDWATER MONITORING WELLS - EAST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Wells Within the Waste Boundary
Well ID
Boron
Sulfate
Total
Dissolved
Solids
Transition Flow Zone
ABMW-05D
Bedrock Flow Zone
ABMW-06BR ND
S
ABMW-07BR
I NT
D
ABMW-07BRL
NT
S
lABMW-07BRLL7 NE
1 NE
NE
Wells Between Waste Boundary
and Compliance Boundary
Well ID
Boron
Sulfate
Total
Dissolved
Solids
Shallow Flow Zone
MW-35S
NE
NE
NE
MW-37S
NE
NE
NE
Transition Flow Zone
CCR-100D
ND D
D
CCR-101D
ND NT
D
GMW-01A
S NT
GMW-02
S
GMW-06
S
MW-11D
ND
D
MW-35D
NE NE
NE
MW-37D
NE NE
NE
Bedrock Flow Zone
CCR-100BR
ND
D
D
CCR-101BR
ND
S
CCR-102BR
ND
S
D
CCR-103BR
S
S
S
CCR-104BR
S
S
D
CCR-105BR
S
NT
S
CCR-106BR
r
S
S
CCR-107BR
NT
NT
CCR-108BR
S
S
CCR-109BR
CCR-110BR
D
D
D
CCR-111BR
NT
NT
S
GMW-10
GMW-11
MW-03BR
S
S
IN
MW-11BR
ND
MW-35BR
NE
NE
E
MW-37BR
NE
NE
E
MW-108BRL
NE
NE
NE
MW-108BRLL
NE
NE
I NE
Wells Downgradient of the Source Area
At or Beyond Compliance Boundary
Well ID
Boron
Sulfate
Total
Dissolved
Solids
Shallow Flow Zone
GPMW-01S I I S S
Transition Flow Zone
GPMW-01D
S
S
GPMW-02D
ND
GPMW-03D
D S
S
MW-22D
D
D
MW-34D
NE NE
NE
MW-36D
NE NE
NE
Bedrock Flow Zone
CW-01
ND
D
GPMW-01BR
S
S
S
GPMW-02BR
S
S
GPMW-03BR
D
S
D
MW-01BR
MW-01BRL
NE
NE
NE
MW-22BR
S
MW-23BRR
ND
D
S
MW-27BR
ND
MW-28BR
ND
MW-29BR
ND
D
MW-30BR
S
7NUE
MW-34BR
NE
NE
MW-36BR
NE
NE2
Mann -Kendall trend analysis and results prepared by Arcadis U.S. Inc.
Notes:
1. Summary of results and trends are presented for samples collected from 2010 - 2019.
2. Trend results are presented when at least four samples were available and frequency of detection was >50 % . Statistically significant trends are reported at the 95 % confidence level.
3. Variability Index (VI) is calculated as the (maximum - minimum) / median concentration and is calculated using detected concentrations only. Values less than 1 indicate low variability in the dataset.
ND = Greater than 50 percent of constituent concentrations were non -detect
D = Statistically significant, decreasing concentration trend
S = Stable. No significant trend and variability is low (VI <_ 1)
NT = No significant trend and variability is high (VI > 1)
= Statistically significant, increasing concentration trend.
NE = Insufficient number of samples to evaluate trend (n a 4)
Page 1 of 1

TABLE 6-8
SEEPS CORRECTIVE ACTION STRATEGY - EAST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Approximate
Seep ID
Regulatory
General Location
Average Present
Seep Corrective Action Strategy
Program
Flow
(cfs)
Continue to cover under NPDES permit. Cessation of sluicing (i.e., passive
S-01 through S-07
NPDES
Toe of WAB main dam
0.001 avg.
decanting) to the WAB initiated in December 2018, active decanting is anticipated
to further reduce flow at these locations.
Re-route flow to tie to NPDES outfall for S-07. Cessation of sluicing to the WAB
S-08
SOC
Toe of WAB main dam
0.002
initiated in December 2018, active decanting is anticipated to further reduce flow at
these locations.
Groundwater remediation by extraction is proposed south, upgradient of the EAB
S-14
SOC
West of Gypsum Storage Area
0.02
pond which is anticipated to reduce flows and COI migration toward the EAB pond
and S-14.
Area north of WAB within
Cessation of sluicing to the WAB initiated in December 2018 followed by
S-18
SOC
decomissioned sluice line
0.004
decommissioning of sluice lines, substantially reducing flow at this location. No
corridor
additional corrective action for this location is anticipated.
Cessation of sluicing to the WAB initiated in December 2018 followed by
S-20
SOC
Area north of WAB and east of
0.01
decommissioning of sluice lines, substantially reducing flow at this location. WAB
heated water discharge pond
active decanting and closure is predicted to cause flow to cease in the future. No
additional corrective action for this location is anticipated.
Groundwater remediation by extraction is proposed in drainage area to the
Drainage area to northeast of
northeast of the EAB, upgradient of S-21. Groundwater extraction is predicted to
S-21
SOC
0.01
reduce flows and COI migration toward S-21. Currently, seep is often dry or
EAB
minimal flow. Anticipated to remain upgradient from future NPDES outfall at eastern
discharge canal.
Notes:
avg. - average
cfs- cubic feet per second
COI - constituent of interest
EAB - East Ash Basin
NPDES - National Pollution Discharge Elimination System
WAB - West Ash Basin
SOC - Special Order by Consent
Prepared by: KTL Checked by: CDE
Page 1 of 1

TABLE 6-9
WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Total
Chromium
Analytical Parameters
pH
Boron
Strontium
Sulfate
Dissolved
Antimony
(VI)
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Vanadium
Solids
Impacted by
Coal Ash?
Comments
Reporting Units
S.U.
ug/L
ug/L
mg/L
mg/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
15A NCAC 02L Standard
6.5-8.5
700
NE
250
500
1*
SO
10
1*
300
50
NE
20
0.3*
Background Threshold Values (Transition Flow Zone)'
6.3 - 7.6
50
760
37
540
1
17
25
1
1210
405
4
2
30
Background Threshold Values (Transition Flow Zone)z
6.3-7.6
50
760
1 38
710
1
1 12
22
3
1 1293
260
8
2
1 23
BTUs Data Set Range (Transition Flow Zone)z
6.3 - 7.6
< 50 - < 50
64 - 615
0.18 - 77
170 - 820
< 1 - < 1
1.60 - 13.1
1.26 - 42.7
< 1 - 4.01
12 - 1760
<5 - 820
< 1 - 9.9
< 1 - 3.57
0.983 - 24.4
Background Threshold Values (Bedrock Flow Zone)'
6.8 - 8.3
50
232
74
530
1
0.2
4
6
4227
1198
35
1
2
Background Threshold Values (Bedrock Flow Zone)'
6.1-8.3
50
438
69
560
1
1
4
18
5130
1773
22
1
3
BTVs Data Set Range (Bedrock Flow Zone)
6.1 - 8.3
< 50 - < 50
64 - 615
0.18 - 77
170 - 820
< 1 - < 1
<0.025 - 1.7
< 1 - 9.27
< 1 - 21.7
< 10 - 6220
<5 - 1510
< 1 - 24.3
< 1 - 1.19
<0.3 - 3.03
Piedmont Background Threshold Value Ranges °
3.6 - 9
50- 176.8
27 - 2120
1.2 - 510
50- 1200
0.5 - 2.9
0.03 - 12
1 - 26
0.088 - 88.85
56.3 - 37500
7 - 9170
0.5 - 26.2
0.5 - 2.4
0.33 - 25.8
SynTerra
Sample ID
Sample Collection
Analytical Results
Map ID
Date
Northeast of EAB and north of Intake Canal. The Intake Canal is considered a hydrologic divide where
RO-01
RO-01 (Vendor)
03/16/2015
6.9
<100
390
51
405
<3
<20
<10
<5
<50
8.29
<10
2.39
2.84
No
affected groundwater is not anticipated to migrated beyond or where migration is significantly
restricted. This is supported by boron, sulfate and TDS concentrations below background or within
background data set ranges. Low vanadium exceedance value might be naturally occurring. The
RO-01
RO-01 (Duke)
03/16/2015
NM
<50
432
48
390
<1
NA
<5
<1
<10
10
<1
1.57
3.47
No
bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones, where
background concentrations of vanadium in the transition flow zone are greater.
RO-02
RO-02(Vendor)
05/04/2015
6.6
<50
<5
<8
383
<5
0.11
<5
<5
<500
<5
<5
<5
<10
No
Southeast and hydraulically upgradient of EAB and WAB. Boron, sulfate, and TDS concentrations are
below background or within background data set ranges. All COIs are below comparative criteria.
RO-02
RO-02 (Duke)
05/04/2015
NM
<50
205
72
380
<1
NA
<5
<1
17
<5
1.42
<1
1.76
No
RO-03
RO-03 (Vendor)
03/12/2015
6.3
<500
180
71
410
<1
<10
<1
<1
<50
<5
2.5
<1
<5
No
Southeast and hydraulically upgradient of EAB and WAB. Boron, sulfate, and TDS concentrations are
below background or within background data set ranges. All COIs are below comparative criteria.
RO-03
RO-03(Duke)
03/12/2015
NM
<50
190
74
400
<1
NA
<5
<1
<10
<5
<1
<1
2.69
No
RO-04
RO-04 (Vendor)
02/19/2015
6.8
<50
260
7
267
<0.5
<5
2.69
<1
228
144
<2
<2
1.38
No
East and hydraulically upgradient of EAB. Boron, sulfate, and TDS concentrations are below
background or within background data set ranges. All COIs are below comparative criteria.
RO-04
RO-04(Duke)
02/19/2015
NM
<50
250
8.1
250
<1
NA
<5
<1
215
152
<1
<1
0.88
No
RO-07
RO-07 (Vendor)
08/17/2015
6.2
<5
268
7.1
200
<0.5
0.57
6.2
<0.5
53.8
29.4
<0.5
<0.5
5.9
No
East and hydraulically upgradient of EAB. Boron, sulfate, and TDS concentrations are below
background or within background data set ranges. All COIs are below comparative criteria. Low
vanadium exceedance value might be naturally occurring. The bedrock flow zone at Roxboro is
unconfined and largely connected to upper flow zones, where background concentrations of vanadium
RO-07
RO-07 (Duke)
08/17/2015
NM
<50
259
6.5
200
<1
NA
<5
<1
24
28
<1
<1
6.03
No
in the transition flow zone are greater.
RO-08
RO-08 (Vendor)
04/27/2015
6.7
<5
255
29.2
366
<0.5
0.19
<0.5
<0.5
<50
1.9
0.74
<0.5
4.5
No
Southeast and hydraulically upgradient of EAB and WAB. Boron, sulfate, and TDS concentrations are
below background or within background data set ranges. Low vanadium exceedance value might be
naturally occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper
RO-08
RO-08 (Duke)
04/27/2015
NM
<50
251
27
360
<1
NA
<5
<1
24
<5
<1
<1
4.78
No
flow zones, where background concentrations of vanadium in the transition flow zone are greater.
RO-1000
RO-1000
10/20/2016
5.1
<25
167
3.9
150
<0.5
0.19
0.6
<0.1
<50
4
<0.5
<0.5
0.6
No
Southeast and hydraulically upgradient of WAB. Boron, sulfate, and TDS concentrations are below
background or within background data set ranges. All COIs are below comparative criteria.
RO-1001
RO-1001
10/05/2016
6.3
<25
119
10.1
179
<0.5
0.099
0.55
<0.1
<50
12.4
<0.5
<0.5
0.83
No
Southeast and upgradient of WAB. Boron, sulfate, and TDS concentrations are below background or
within background data set ranges. All COIs are below comparative criteria.
RO-1003
RO-1003
10/20/2016
6.4
<25
101
25
199
<0.5
0.12
<0.5
<0.1
<50
3.8
1.6
<0.5
1.6
No
Southeast and hydraulically upgradient of WAB. Boron, sulfate, and TDS concentrations are below
background or within background data set ranges. All COIs are below comparative criteria.
RO-1004
RO-1004
10/20/2016
6.2
<25
176
5.6
284
<0.5
<0.03
<0.5
<0.1
565
121
<0.5
<0.5
<0.3
No
Southeast and hydraulically upgradient of WAB. Boron, sulfate, and TDS concentrations are below
background or within background data set ranges. All COIs are below comparative criteria.
Southwest and hydraulically upgradient of WAB. Boron, sulfate, and TDS concentrations are below
background or within background data set ranges. All COIs are below comparative criteria. Low
RO-1005
RO-1005
10/20/2016
5.8
<25
163
<2
129
<0.5
0.75
1.1
<0.1
<50
0.78
<0.5
<0.5
6.1
No
vanadium exceedance value might be naturally occurring. The bedrock flow zone at Roxboro is
unconfined and largely connected to upper flow zones, where background concentrations of vanadium
in the transition flow zone are greater.
Page 1 of 4

TABLE 6-9
WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Total
Chromium
Analytical Parameters
pH
Boron
Strontium
Sulfate
Dissolved
Antimony
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Vanadium
Solids
(VI)
Impacted by
Coal Ash?
Comments
Reporting Units
S.U.
ug/L
ug/L
mg/L
mg/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
15A NCAC 02L Standard
6.5-8.5
700
NE
250
500
1*
SO
10
1*
300
50
NE
20
0.3*
Background Threshold Values (Transition Flow Zone)'
6.3 - 7.6
50
760
37
540
1
17
25
1
1210
405
4
2
30
Background Threshold Values (Transition Flow Zone)z
6.3-7.6
50
760
1 38
710
1
1 12
22
3
1 1293
260
8
2
1 23
BTUs Data Set Range (Transition Flow Zone)z
6.3 - 7.6
< 50 - < 50
64 - 615
0.18 - 77
170 - 820
< 1 - < 1
1.60 - 13.1
1.26 - 42.7
< 1 - 4.01
12 - 1760
<5 - 820
< 1 - 9.9
< 1 - 3.57
0.983 - 24.4
Background Threshold Values (Bedrock Flow Zone)'
6.8 - 8.3
50
232
74
530
1
0.2
4
6
4227
1198
35
1
2
Background Threshold Values (Bedrock Flow Zone)'
6.1 - 8.3
50
438
69
560
1
1
4
18
5130
1773
22
1
3
BTVs Data Set Range (Bedrock Flow Zone)
6.1 - 8.3
< 50 - < 50
64 - 615
0.18 - 77
170 - 820
< 1 - < 1
<0.025 - 1.7
< 1 - 9.27
< 1 - 21.7
< 10 - 6220
<5 - 1510
< 1 - 24.3
< 1 - 1.19
<0.3 - 3.03
Piedmont Background Threshold Value Ranges °
3.6 - 9
50- 176.8
27 - 2120
1.2 - 510
50- 1200
0.5 - 2.9
0.03 - 12
1 - 26
0.088 - 88.85
56.3 - 37500
7 - 9170
0.5 - 26.2
0.5 - 2.4
0.33 - 25.8
SynTerra
Sample ID
Sample Collection
Analytical Results
Map ID
Date
RO-10-1
RO-10-1(Vendor)
05/04/2015
6.5
<50
936
<2
999
<5
0.062
<5
<5
<500
<5
<5
<5
<10
NO
Southwest and hydraulically upgradient of WAB and western discharge canal. The western discharge
RO-10-1
RO-10-1 (Duke)
05/04/2015
NM
<50
1020
17
1000
<1
NA
<5
3.74
142
982
1.72
<1
3.26
No
canal is considered a hydrologic divide where affected groundwater is not anticipated to migrated
beyond or where migration is significantly restricted. Boron and sulfate concentrations are below
background or within background data set ranges. Strontium and TDS concentrations are within
RO-SO-1
RO-10-1
07/11/2017
7.1
<50
570
26
644 J3
<SO
NA
<5
<50
290
1100
<10
<1
<10
NO
Piedmont background threshold value ranges. Low strontium, TDS, and vanadium exceedance values
might be naturally occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to
upper flow zones, where background concentrations of vanadium in the transition flow zone are
RO-10-1
RO-10-1
10/18/2017
NM
<50
520
22
624
NA
NA
<5
<50
52
1200
NA
2.4
<10
No
greater.
RO-10-1
RO-10-1
06/20/2018
7.1
<100
720
18
Boo
<2
NA
<1
1.9
510
840
<10
<5
4.2
NO
Southeast and hydraulically upgradient from the ash basins. Boron, sulfate, and TDS concentrations
RO-1010
RO-1010
04/12/2017
5.9
<25
135
8.2
206
<0.5
2.3
2.3
0.11
<50
9.2
<0.5
<0.5
6.8
NO
are below background or within background data set ranges. Low vanadium exceedance value might be
naturally occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper
flow zones, where background concentrations of vanadium in the transition flow zone are greater.
Southeast and hydraulically upgradient from the ash basins. Boron, sulfate, and TDS concentrations
RO-1010A
RO-1010A
04/12/2017
6.5
<25
180
31.3
332
<0.5
0.082
<0.5
<0.1
80
0.82
0.98
<0.5
7.4
No
are below background or within background data set ranges. Low vanadium exceedance value might be
naturally occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper
flow zones, where background concentrations of vanadium in the transition flow zone are greater.
East and hydraulically upgradient from the EAB. Boron, sulfate, and TDS concentrations are below
RO-1011
RO-1011
01/17/2017
6.0
<25
214
4.7
152
<0.5
0.59
0.52
<0.1
97.9
1.5
<0.5
<0.5
6.2
No
background or within background data set ranges. Low vanadium exceedance value might be naturally
occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones,
where background concentrations of vanadium in the transition flow zone are greater.
East and hydraulically upgradient from the EAB. Boron, sulfate, and TDS concentrations are below
RO-1012
RO-1012
10/05/2016
5.9
<25
109
<2
116
<0.5
2
3.8
<0.1
232
5.6
<0.5
<0.5
7
NO
background or within background data set ranges. Low vanadium exceedance value might be naturally
occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones,
where background concentrations of vanadium in the transition flow zone are greater.
RO-1013
RO-1013
SO/OS/2016
<0.5
1.5
2.5
<0.1
1400
68
<0.5
<0.5
3.8
NO
Turbidity of Sample >_ 10 NTUs. East and hydraulically upgradient from the EAB. Boron, sulfate, and
TDS concentrations are below background or within background data set ranges.
Boron, sulfate, and TDS concentrations are below background or within background data set ranges.
RO-1015
RO-1015
01/17/2017
5.9
<25
248
6.9
160
<0.5
0.037
<0.5
<0.1
576
9.2
<0.5
<0.5
3.5
No
Low vanadium exceedance value might be naturally occurring. The bedrock flow zone at Roxboro is
unconfined and largely connected to upper flow zones, where background concentrations of vanadium
in the transition flow zone are greater.
East and hydraulically upgradient from the EAB. Boron, sulfate, and TDS concentrations are below
RO-1016
RO-1016
10/05/2016
5.8
<25
83.6
4.6
117
<0.5
2
2.5
<0.1
<50
3.4
<0.5
<0.5
5.5
No
background or within background data set ranges. Low vanadium exceedance value might be naturally
occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones,
where background concentrations of vanadium in the transition flow zone are greater.
East and hydraulically upgradient from the EAB. Boron, sulfate, and TDS concentrations are below
RO-1017
RO-1017
11/17/2016
6.3
<25
226
7.3
224
<0.5
0.87
1.2
<0.1
<50
10
<0.5
<0.5
5.1
No
background or within background data set ranges. Low vanadium exceedance value might be naturally
occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones,
where background concentrations of vanadium in the transition flow zone are greater.
Southeast and hydraulically upgradient from the EAB. Boron, sulfate, and TDS concentrations are below
RO-1018
RO-1018
11/10/2016
6.4
<25
149
9.5
209
<0.5
0.078
<0.5
<0.1
<50
4.1
0.75
<0.5
4.1
NO
background or within background data set ranges. Low vanadium exceedance value might be naturally
occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones,
where background concentrations of vanadium in the transition flow zone are greater.
RO-10-2
RO-10-2(Vendor)
05/04/2015
6.7
<50
<5
27
369
<5
<0.03
<5
<5
<500
<5
<5
<5
<10
NO
Southwest and hydraulically upgradient of WAB and western discharge canal. The western discharge
canal is considered a hydrologic divide where affected groundwater is not anticipated to migrated
beyond or where migration is significantly restricted. Boron, sulfate, and TDS concentrations are below
RO-SO-2
RO-10-2 (Duke)
OS/04/2015
NM
<50
277
25
360
<1
NA
<5
<1
1260
369
1.54
<1
3.87
No
background or within background data set ranges. Low vanadium exceedance value might be naturally
occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones,
where background concentrations of vanadium in the transition flow zone are greater.
RO-10-2
I RO-10-2
10/18/2017
NM
<50
220
29
358
NA
NA
<5
<50
370
130
NA
2.4
<10
NO
Page 2 of 4

TABLE 6-9
WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Total
Chromium
Analytical Parameters
pH
Boron
Strontium
Sulfate
Dissolved
Antimony
(VI)
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Vanadium
Solids
Impacted by
Coal Ash?
Comments
Reporting Units
S.U.
ug/L
ug/L
mg/L
mg/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
15A NCAC 02L Standard
6.5-8.5
700
NE
250
500
1*
SO
10
1*
300
50
NE
20
0.3*
Background Threshold Values (Transition Flow Zone)'
6.3 - 7.6
50
760
37
540
1
17
25
1
1210
405
4
2
30
Background Threshold Values (Transition Flow Zone)z
6.3-7.6
50
760
1 38
710
1
1 12
22
3
1 1293
260
8
2
1 23
BTUs Data Set Range (Transition Flow Zone)z
6.3 - 7.6
< 50 - < 50
64 - 615
0.18 - 77
170 - 820
< 1 - < 1
1.60 - 13.1
1.26 - 42.7
< 1 - 4.01
12 - 1760
<5 - 820
< 1 - 9.9
< 1 - 3.57
0.983 - 24.4
Background Threshold Values (Bedrock Flow Zone)'
6.8 - 8.3
50
232
74
530
1
0.2
4
6
4227
1198
35
1
2
Background Threshold Values (Bedrock Flow Zone)'
6.1-8.3
50
438
69
560
1
1
4
18
5130
1773
22
1
3
BTVs Data Set Range (Bedrock Flow Zone)
6.1 - 8.3
< 50 - < 50
64 - 615
0.18 - 77
170 - 820
< 1 - < 1
<0.025 - 1.7
< 1 - 9.27
< 1 - 21.7
< 10 - 6220
<5 - 1510
< 1 - 24.3
< 1 - 1.19
<0.3 - 3.03
Piedmont Background Threshold Value Ranges °
3.6 - 9
50- 176.8
27 - 2120
1.2- 510
50- 1200
0.5 - 2.9
0.03 - 12
1 - 26
0.088 - 88.85
56.3 - 37500
7 - 9170
0.5 - 26.2
0.5 - 2.4
0.33 - 25.8
SynTerra
Sample ID
Sample Collection
Analytical Results
Map ID
Date
Southwest and hydraulically upgradient from the WAB. Boron, sulfate, and TDS concentrations are
RO-1021
RO-1021
01/18/2017
7.2
<25
183
41.5
295
<0.5
<0.025
<0.5
<0.1
<50
117
2
<0.5
3.5
NO
below background or within background data set ranges. Low vanadium exceedance value might be
naturally occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper
flow zones, where background concentrations of vanadium in the transition flow zone are greater.
RO-1023
RO-1023
Ol/18/2017
6.8
<25
77.9
23.7
228
<0.5
0.12
<0.5
<0.1
<50
90.3
1.1
<0.5
1.8
NO
South and hydraulically upgradient. Boron, sulfate, and TDS concentrations are below background or
within background data set ranges. All COIs are below comparative criteria.
RO-1024
RO-1024
01/17/2017
6.0
<25
93.3
31.3
171
<0.5
0.068
<0.5
<0.1
<50
<0.5
<0.5
<0.5
0.73
No
Southeast and hydraulically upgradient. Boron, sulfate, and TDS concentrations are below background
or within background data set ranges. All COIs are below comparative criteria.
Southeast and hydraulically upgradient. Boron, sulfate, and TDS concentrations are below background
RO-1025
RO-1025
Ol/24/2017
6.4
<25
139
13.7
191
<0.5
3.7
4
<0.1
61.4
1.2
<0.5
<0.5
17.1
NO
or within background data set ranges. Low vanadium exceedance value might be naturally occurring.
The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones, where
background concentrations of vanadium in the transition flow zone are greater.
RO-1026
RO-1026
04/12/2017
5.7
<25
96.7
2.2
152
<0.5
0.3
<0.5
<0.1
104
12.7
<0.5
<0.5
0.4
NO
Southeast and hydraulically upgradient. Boron, sulfate, and TDS concentrations are below background
or within background data set ranges. All COIs are below comparative criteria.
RO-1027
RO-1027
04/12/2017
7.3
<25
118
5.4
205
<0.5
<0.025
<0.5
<0.1
177
66.5
4.1
<0.5
<0.3
No
Southeast and hydraulically upgradient. Boron, sulfate, and TDS concentrations are below background
or within background data set ranges. All COIs are below comparative criteria.
RO-11
RO-11 (Vendor)
08/17/2015
6.4
<5
236
31.1
326
<0.5
1.2
1.7
<0.5
<50
1.5
2
<0.5
10.6
NO
Southeast and upgradient of EAB and WAB. Boron, sulfate, and TDS concentrations are below
background or within background data set ranges. Low vanadium exceedance value might be naturally
occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones,
RO-11
RO-11 (Duke)
08/17/2015
NM
<50
231
29
340
<1
NA
<5
<1
26
<5
2.01
<1
10.2
No
where background concentrations of vanadium in the transition flow zone are greater.
RO-12
RO-12 (Vendor)
08/17/2015
6.8
6.1
326
71.8
463
<0.5
<0.03
<0.5
<0.5
1100
494
5.9
<0.5
<1
NO
Southeast and hydraulically upgradient of EAB and WAB. Boron, sulfate, and TDS concentrations are
below background or within background data set ranges. All COIs are below comparative criteria.
RO-12
RO-12(Duke)
08/17/2015
NM
<50
325
73
470
<1
NA
<5
<1
1140
531
5.75
<1
0.455
No
RO-13
RO-13 (Vendor)
08/17/2015
6.0
<5
166
2.6
138
<0.5
0.92
1.3
<0.5
<50
3.7
<0.5
<0.5
3.1
NO
East and hydraulically upgradient of EAB. Boron, sulfate, and TDS concentrations are below
background or within background data set ranges. Low vanadium exceedance value might be naturally
occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones,
RO-13
RO-13 (Duke)
08/17/2015
NM
<50
165
1.5
130
<1
NA
<5
<1
<10
<5
<1
<1
3.06
No
where background concentrations of vanadium in the transition flow zone are greater.
RO-14
RO-14 (Vendor)
08/18/2015
7.1
<5
244
52.3
382
<0.5
<0.03
<0.5
<0.5
827
5.9
0.52
1.1
5.6
No
Boron, sulfate, and TDS concentrations are below background or within background data set ranges.
Low vanadium exceedance value might be naturally occurring. The bedrock flow zone at Roxboro is
unconfined and largely connected to upper flow zones, where background concentrations of vanadium
RO-14
RO-14 (Duke)
08/18/2015
NM
<50
249
51
390
<1
NA
<5
<1
887
6
<1
1.15
6.02
No
in the transition flow zone are greater.
RO-15
RO-15 (Vendor)
10/22/2015
7.0
<5
190
47.1
456
<0.5
0.83
1.3
<0.5
<50
0.62
4.2
<0.5
16.1
NO
East and hydraulically upgradient of EAB. Boron, sulfate, and TDS concentrations are below background
or within background data set ranges. Low vanadium exceedance value might be naturally occurring.
The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones, where
RO-15
RO-15 (Duke)
10/22/2015
NM
<50
188
46
460
<1
NA
<5
<1
17
<5
4.15
<1
14.9
No
background concentrations of vanadium in the transition flow zone are greater.
RO-16
RO-16 (Vendor)
10/22/2015
6.1
<5
121
<2
<25
<0.5
1.2
1.4
<0.5
<50
0.98
<0.5
<0.5
5.5
NO
East and hydraulically upgradient from the EAB. Boron, sulfate, and TDS concentrations are below
background or within background data set ranges. Low vanadium exceedance value might be naturally
occurring. The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones,
RO-16
RO-16 (Duke)
10/22/2015
NM
<50
124
19
170
<1
NA
<5
<1
<10
<5
<1
<1
5.13
No
where background concentrations of vanadium in the transition flow zone are greater.
Page 3 of 4

TABLE 6-9
WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Total
Chromium
Analytical Parameters
pH
Boron
Strontium
Sulfate
Dissolved
Antimony
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Vanadium
Solids
(VI)
Impacted by
Coal Ash?
Comments
Reporting Units
S.U.
ug/L
ug/L
mg/L
mg/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
15A NCAC 02L Standard
6.5-8.5
700
NE
250
500
1*
SO
10
1*
300
50
NE
20
0.3*
Background Threshold Values (Transition Flow Zone)'
6.3 - 7.6
50
760
37
540
1
17
25
1
1210
405
4
2
30
Background Threshold Values (Transition Flow Zone)z
6.3-7.6
50
760
1 38
710
1
1 12
22
3
1 1293
260
8
2
1 23
BTVs Data Set Range (Transition Flow Zone)z
6.3 - 7.6
< 50 - < 50
64 - 615
0.18 - 77
170 - 820
< 1 - < 1
1.60 - 13.1
1.26 - 42.7
< 1 - 4.01
12 - 1760
<5 - 820
< 1 - 9.9
< 1 - 3.57
0.983 - 24.4
Background Threshold Values (Bedrock Flow Zone)'
6.8 - 8.3
50
232
74
530
1
0.2
4
6
4227
1198
35
1
2
Background Threshold Values (Bedrock Flow Zone)'
6.1 - 8.3
50
438
69
560
1
1
4
18
5130
1773
22
1
3
BTVs Data Set Range (Bedrock Flow Zone)
6.1 - 8.3
< 50 - < 50
64 - 615
0.18 - 77
170 - 820
< 1 - < 1
<0.025 - 1.7
< 1 - 9.27
< 1 - 21.7
< 10 - 6220
<5 - 1510
< 1 - 24.3
< 1 - 1.19
<0.3 - 3.03
Piedmont Background Threshold Value Ranges °
3.6 - 9
50- 176.8
27 - 2120
1.2 - 510
50- 1200
0.5 - 2.9
0.03 - 12
1 - 26
0.088 - 88.85
56.3 - 37500
7 - 9170
0.5 - 26.2
0.5 - 2.4
0.33 - 25.8
SynTerra
Sample ID
Sample Collection
Analytical Results
Map ID
Date
R02014-RAW
R02014-RAW
07/11/2017
6.7
<250
274
8.4
241
<0.5
0.031
<0.5
0.16
158
96.7
<0.5
<0.5
1.9
NO
Boron, sulfate, and TDS concentrations are below background or within background data set ranges.
All COIs are below comparative criteria.
R02031-RAW
R02031-RAW
07/10/2017
<25
114
10.8
165
<0.5
0.15
<0.5
<0.1
54
12.9
<0.5
<0.5
0.95
NO
Southeast and hydraulically upgradient of WAB. Boron, sulfate, and TDS concentrations are below
background or within background data set ranges. All COIs are below comparative criteria.
Southwest and upgradient of WAB and western discharge canal. The western discharge canal is
considered a hydrologic divide where affected groundwater is not anticipated to migrated beyond or
R02040-RAW3
R02040-RAW3
07/11/2017
6.2
<500
614
28
891
<0.5
<0.025
<0.5
0.82
55.4
792
3
1.3
1.8
NO
where migration is significantly restricted. Boron and sulfate concentrations are below background or
within background data set ranges. Strontium and TDS concentrations are within Piedmont background
threshold value ranges. Low strontium and TDS exceedance values might be naturally occurring.
Southwest and upgradient of WAB and western discharge canal. Boron, sulfate, and TDS
concentrations are below background or within background data set ranges. Low vanadium and
R02040-RAW4
R02040-RAW4
07/11/2017
NM
<500
358
23.6
474
<0.5
<0.025
<0.5
0.66
269
1900
11.1
<0.5
4.3
No
manganese exceedance values might be naturally occurring. Manganese concentrations marginally
greater than BTVs, however, remain within Piedmont background range. The bedrock flow zone at
Roxboro is unconfined and largely connected to upper flow zones, where background concentrations of
vanadium in the transition flow zone are greater.
Southeast and hydraulically upgradient. Boron, sulfate, and TDS concentrations are below background
R02056-RAW
R02056-RAW
07/11/2017
6.2
<25
68.4
1.4
107
<0.5
1.3
2.1
<0.1
930
10.2
<0.5
<0.5
No
or within background data set ranges. Low vanadium exceedance value might be naturally occurring.
The bedrock flow zone at Roxboro is unconfined and largely connected to upper flow zones, where
background concentrations of vanadium in the transition flow zone are greater.
Notes:
Bold text - greatest comparative value
0 - Bold highlighted concentration indicates exceedance of the 15A NCAC 02L .0202 Standard or the IMAC. (Effective date for SSA NCAC 02L .0202 Standard and IMAC is April 1, 2013)
0 - Bold highlighted concentration indicates exceedance BTV from April 2017 or December 2018, whichever is greater.
- Turbidity of Sample >_ 10 NTUs
Reference Figure 5-7a for water supply well locations
' - BTUs were calculated using data from background groundwater samples collected November 2010 to January 2017.
z - Updated BTVs were calculated using data from background groundwater samples collected November 2010 to November 2018.
4 - Piedmont background threshold value ranges include the Duke Energy calculated 20174 and 2019' background threshold values from 10 Duke Energy facilities located in the Piedmont physiographic region (Allen Steam Stations, Belews Creek Steam Stations, Buck Steam Station °, Cape
Fear Steam Electric Plant°, Cliffside Steam Stations, Dan River Steam Station 4, Marshall Steam Stations, Mayo Steam Electric Plants, Riverbend Steam Station °, and Roxboro Steam Electric Plant).
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013
< - Concentration not detected at or above the adjusted reporting limit.
COI - constituent of Interest
EAB - East Ash Basin
13 - The sample matrix interfered with the ability to make any accurate determination.
NA - not available
NE - not established
NM - Not measured
mg/L - Milligrams Per Liter
pg/L - Micrograms Per Liter
S.U. - standard units
WAB - West Ash Basin
Prepared by: KTL Checked by: TAW
Page 4 of 4

TABLE 6-10
NPDES PERMIT LIMITS AND ANTICIPATED GROUNDWATER
REMEDIATION PARAMETER LEVELS
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
internal Outfall012B
Outfall003
Estimated
Concentrations in
Parameter
E
E
Recovered
s p1
3
s °1
3
Groundwater
o
O x
o>
o x
Flow
M&R
M&R
0.0785 MGD
pH
M&R
6.0-9.0 S.U.
6.40
TSS
30
100
-
-
18.1
Turbidity
-
-
M&R
3.70
Oil & Grease
15
20
-1
-
No Data
Chlorine
Residual
-
-
M&R
No Data
Phosphorous
-
-
M&R
No Data
Nitrogen
-
-
M&R
No Data
Ammonia
M&R
1
1 5
No Data
Arsenic
-
-
M&R
0.00122
Antimony
-
-
M&R
0.00100
Selenium
-
-
M&R
0.01148
Molybdenum
-
-
M&R
0.00179
Mercury
-
-
M&R
0.00005
Thallium
-
-
M&R
0.00020
Chlorides
-
-
M&R
32.5
Hardness
-
-
M&R
No Data
Notes:
Concentrations in mg/L
MGD - million gallons per day
M&R - monitor and report
ND - not detected
a Permit parameters based on Draft NPDES Permit Issued May 2019
b The pH range in monitoring wells near the recovery system is 5.7 to 6.9.
Prepared by: JEC Checked by: GTC
Page 1 of 1

TABLE 6-11
FEATURE IRRIGATION SYSTEM SETBACK
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Feature
Irrigation System Setback (feet)
Spray
Drip
Private residence
400
100
Place of assembly owned by permittee
200
15
Surface waters
100
100
Property line
150
50
Prepared by: VTV Checked by: CDE
Page 1 of 1

TABLE 6-12
REMEDIAL TECHNOLOGY SCREENING SUMMARY
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Summary of Remedial
Retain Technology for Further Consideration
Technology Screening
Technology
Yes/No
Rationale
COIs pose no unacceptable risk to human health
Monitored Natural Attenuation
Yes
or the environment under conservative exposure
scenarios and could be implemented in
conjunction with source control measures.
In -Situ Technologies
The area, depth and heterogeneity of geological
Low Permeability Barriers
No
conditions requiring groundwater remediation
are greater in size and complexity for uniform
implementation of this technology.
Possible application to enhance capture of mobile
Groundwater Flushing
Yes
COIs (e.g., boron) or to add amendments to
immobilize certain COIs.
The area, depth and heterogeneity of geological
Encapsulation
No
conditions requiring groundwater remediation
are greater in size and complexity for uniform
implementation of this technology.
The area, depth and heterogeneity of geological
conditions requiring groundwater remediation
Permeable Reactive Barrier
No
are too large for feasible trenching. Injection of
reagents through boreholes is possible;
however, technology is not well established for
boron, the primary COI.
Groundwater Extraction Technologies
Vertical Extraction Wells
Yes
Applicable for groundwater extraction of mobile
COIs.
Horizontal/Angular Extraction Wells
No
These wells are used in special circumstances.
Extraction Trenches
No
Not feasible due to infrastructure in the
potentially applicable area.
Hydraulic Fracturing
No
Potential for unfavorable fracture patterns that
negatively affect COI plume control.
Phytoremediation
No
Could potentially serve as a secondary means of
groundwater extraction in the future.
Groundwater Treatment Technologies
pH Adjustment
No
Extracted groundwater would be discharged to
the LRB, which has treatment.
Precipitation
No
Extracted groundwater would be discharged to
the LRB, which has treatment.
Page 1 of 2

TABLE 6-12
REMEDIAL TECHNOLOGY SCREENING SUMMARY
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Summary of Remedial
Retain Technology for Further Consideration
Technology Screening
Technology
Yes/No
Rationale
Ion Exchange
No
Extracted groundwater would be discharged to
the LRB, which has treatment.
Membrane Filtration
No
Extracted groundwater would be discharged to
the LRB, which has treatment.
Disposal of Extracted Groundwater
NPDES Permitted Discharge
Yes
Existing permitted discharges for wastewater are
already in place.
Would use much of available capacity and may
POTW
No
not accept large volume of groundwater.
Additional construction of sewer line along public
ROW might be cost prohibitive.
Non -Discharge Permit/Infiltration
No
Significant treatment would be required.
Gallery
Non -Discharge Permit/Land
No
Significant treatment would be required.
Application
Beneficial Reuse
Fire Protection
No
Not reasonable to store extracted groundwater
for fire protection.
Cooling Tower Makeup
No
Extracted groundwater would supply a small
fraction of cooling water required.
Non -Contact Cooling Water
No
Extracted groundwater would supply a small
fraction of cooling water required.
Dust Suppression and Truck Wash
No
Intermittent use.
Prepared by: MSM Checked by: CDE
Page 2 of 2

TABLE 6-13
ALTERNATIVE 2 EXTRACTION WELL SUMMARY - SOURCE AREA 1
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Groundwater Extraction Well System
Number of Wells
Flow Zone
Total Depth
(ft bgs)
32
Bedrock
200-260
0
Clean Water Infiltration
Not applicable
Total Extraction Well Count: 32
System flow and operation assumptions:
Flow rate: 0.7 gpm per well. Total system extraction flow rate of 23 gpm.
Extraction wells operate to maintain water level near bottom of the well.
Notes•
ft bgs - feet below ground surface
gpm - gallons per minute
Prepared by: JEC Checked by: GTC
Page 1 of 1

TABLE 6-14
ENVIRONMENTAL SUSTAINABILITY COMPARISONS FOR REMEDIATION ALTERNATIVES -
SOURCE AREA 1
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Remedial Alternative
Remedial Alternative 1 — Groundwater
Remediation by MNA
Remedial Alternative 2 — Groundwater
Remediation by Extraction
Emissions
Units
COZ Emissions
metric ton
1.14E+00
8.05E+02
Onsite NOx emissions
metric ton
0.00E+00
6.16E-01
Onsite SOX Emissions
metric ton
0.00E+00
6.30E-02
Onsite PMio Emissions
metric ton
0.00E+00
5.54E-02
Total NOx emissions
metric ton
4.23E-04
2.74E+00
Total SOx Emissions
metric ton
1.49E-05
1.76E+00
Total PMio Emissions
metric ton
8.58E-05
4.28E-01
Total Energy Used
MMBTU
1.44E+01
7.97E+05
Total Emissions
metric ton
1.14E+00
8.11E+02
Notes:
COZ - Airborne emissions of carbon dioxide
MMBTU - Million British Thermal Units
NOx - Airborne emissions of nitrogen oxides (combination of nitrogen monoxide and nitrogen dioxide)
SOx - Airborne emissions of sulfur oxides (combination of sulfur monoxide, sulfur dioxide, sulfur trioxide, and others)
PMlo - Airborne emissions of particulate matter that is 10 micrometers or less in diameter
Prepared by: GTC Checked by: SJB
Page 1 of 1

TABLE 6-15
MODELED GROUNDWATER EXTRACTION WELL DETAILS - SOURCE AREA 1 AND SOURCE AREA 3
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Well ID
Easting
(ft NAD 83)
Northing
(ft NAD 83)
Approximate
Ground Surface
Elevation
(ft NAVD 88)
Operational DTW
Maintained In Well
(ft BGS)
Well
Depth
(ft BGS)
Targeted Flow Zones
Total
Simulated
Flow
(gpm)
Vertical Groundwater Extraction Wells
EX-1
1980606.20
994906.50
426
180
220
Transition Zone/Bedrock
1.1
EX-2
1980707.80
994949.60
428
180
220
Transition Zone/Bedrock
1.4
EX-3
1980793.93
994995.37
430
180
220
Transition Zone/Bedrock
10.1
EX-4
1980901.50
995047.00
430
180
220
Transition Zone/Bedrock
10.3
EX-5
1981009.30
995092.00
426
180
220
Transition Zone/Bedrock
2.2
EX-6
1981106.40
995132.20
429
180
220
Transition Zone/Bedrock
1.9
EX-7
1981196.40
995182.00
431
180
220
Transition Zone/Bedrock
2.2
EX-8
1981501.90
995311.00
429
180
220
Transition Zone/Bedrock
3.1
EX-9
1981595.40
995364.30
427
180
220
Transition Zone/Bedrock
2.4
EX-10
1981703.20
995405.80
428
180
220
Transition Zone/Bedrock
2.3
EX-11
1981802.70
995449.60
425
180
220
Transition Zone/Bedrock
2.3
EX-12
1981902.10
995488.70
430
180
220
Transition Zone/Bedrock
2.3
EX-13
1982001.60
995533.70
437
180
220
Transition Zone/Bedrock
1.6
EX-14
1982093.20
995584.00
433
180
220
Transition Zone/Bedrock
0.4
EX-15
1982195.70
995626.30
436
180
220
Transition Zone/Bedrock
0.4
EX-16
1982498.30
995767.60
424
180
220
Transition Zone/Bedrock
1.4
EX-17
1982593.60
995804.30
427
180
220
Transition Zone/Bedrock
1.0
EX-18
1982697.30
995850.00
433
180
220
Transition Zone/Bedrock
1.0
EX-19
1981697.60
994527.90
468
180
220
Bedrock
0.6
EX-20
1981725.00
994495.40
464
180
220
Bedrock
0.5
EX-21
1981844.80
994461.70
467
180
220
Bedrock
0.6
EX-22
1981915.90
994483.00
463
180
220
Bedrock
0.5
EX-23
1981969.50
994502.90
467
180
220
Bedrock
0.6
EX-24
1982709.12
994507.38
505
240
280
Bedrock
0.5
EX-25
1982776.43
994501.26
507
240
280
Bedrock
0.5
EX-26
1982844.98
994487.80
502
240
280
Bedrock
0.6
EX-27
1982562.37
994453.54
499
180
220
Bedrock
0.6
EX-28
1982626.70
994456.30
499
240
280
Bedrock
0.7
EX-29
1982694.60
994457.45
497
240
280
Bedrock
0.6
EX-30
1982741.31
994453.05
498
240
280
Bedrock
0.5
EX-31
1 1982799.48
994448.64
498
240
280
Bedrock
0.5
EX-32
1982848.84
994423.96
498
240
280
Bedrock
0.5
EX-33
1982909.65
994408.98
499
240
280
Bedrock
0.6
EX-34
1982979.28
994363.15
504
240
280
Bedrock
0.5
EX-35
1983015.60
994332.63
511
240
280
Bedrock
0.5
EX-36
1983123.83
994272.36
512
240
280
Bedrock
0.3
EX-37
1983238.66
994260.88
508
240
280
Bedrock
0.7
EX-38
1983290.43
994277.67
503
240
280
Bedrock
0.8
EX-39
1 1980731.30
994666.20
410
180
220
Bedrock
2.4
EX-40
1980801.30
994675.50
432
180
220
Bedrock
1.7
EX-41
1980861.90
994679.00
442
180
220
Bedrock
1.3
EX-42
1980920.20
994675.50
442
180
220
Bedrock
1.0
EX-43
1980982.00
994662.70
442
180
220
Bedrock
0.9
EX-44
1981025.20
994651.10
443
180
220
Bedrock
0.2
EX-45
1981068.30
994631.20
442
180
220
Bedrock
0.1
EX-46
1981113.80
994603.20
443
180
220
Bedrock
1.5
EX-47
1981165.10
994599.70
443
1 180
220
1 Bedrock
1.6
EX-48
1981221.10
994614.90
447
180
220
Bedrock
1.3
EX-49
1981084.10
994729.30
442
180
220
Bedrock
0.1
EX-50
1981079.80
994772.60
440
180
220
Bedrock
0.1
Notes:
All depths are approximated and may change dependinq on site conditions.
Flow rates are approximate and may change depending on site conditions.
DTW - depth to water
ft - feet
ft BGS - feet below ground surface
gpm - gallons per minute
NA - Not applicable
NAD 83 - North American Datum 1983
NAVD 88 - North American Vertical Datum of 1988
Prepared by: GTC Checked by: KTL
Page 1 of 1

TABLE 6-16
GROUNDWATER EFFECTIVENESS MONITORING PLAN ELEMENTS
EAB/INDUSTRIAL LANDFILL/LCID LANDFILL/GSA AND DFAHA
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Effectiveness Monitoring Plan (EMP) Post -Closure Monitoring Plan (PCMP)
Implemented 30 days after CAP Approval I FImplemented after completion of ash basin closure activities
EMP Groundwater Well Monitoring Network
(background, downgradient of source areas)
CCR-112BR-BGt GMW-10 MW-27BR
Y
20
MW-14BR' GMW-11 MW-28BR
y
MW-19BRL1 GPMW-1BR MW-34BR
a
MW-29BR' GPMW-1D MW-34D
e
MW-30BR1 GPMW-IS MW-35BR
0
.E
CCR-103BR GPMW-2BR MW-35D
f
CCR-104BR GPMW-2D MW-35S
d
CCR-105BR GPMW-3BR MW-36BR
3
CCR-106BR GPMW-3D MW-36D
O
c
CCR-107BR MW-11311 MW-37BR
CCR-108BR MW-1BRL MW-37D
t9
CW-1 MW-3BR MW-37S
GMW-2 MW-22BR MW-108BRL
GMW-6 MW-22D MW-108BRLL
Alkalinity
Aluminum
Bicarbonate Alkalinity
Boron2
Calcium
Selenium
EMP Groundwater Quality3' 4
mi-Annual Sampling Frequency)
Ferrous Iron Sodium
PCMP Groundwater Well Monitoring Network
(background, downgradient of source areas)
A PCMP will be implemented at the Site in accordance with
G.S. 130A-309.214(a)(4)k.2 after completion of
ash basin closure activities.
PCMP Groundwater Quality
(Sampling frequency to be determined)
Iron Strontium
Magnesium
Sulfate
Parameters and sampling frequency to be included in the PCMP in accordance
Manganese
Total Dissolved SolidS2
with G.S. 130A-309.214(a)(4)k.2 when submitted.
Nitrate + Nitrite
Total Organic Carbon
Potassium
EMP and PCMP Groundwater Field Parameters
Water Level Specific Conductivity Temperature
PH Oxidation Reduction Potential Dissolved Oxygen
EMP Review
Annual Effectiveness Monitoring Evaluation and Reoortina
1) Summary of annual groundwater monitoring results
2) Evaluate statistical concentration trends
2) Comparison of observed concentrations to model predictions
3) Evaluation of compliance with applicable Standards
4) Evaluation of system performance and effectiveness
4) Recommend plan adjustments, if applicable, to optimize the remedial action
5-Year Performance Review Reporting
1) Update background analysis
2) Confirm Risk Assessment assumptions remain valid
3) Re-evaluate effectiveness of technology
4) Verify modeling results, update model if needed
5) Modify corrective action approach, as needed, to achieve compliance goal
established
30 days after CAP approval, the EMP will be implemented at the Site and will
continue until there is a total of three years of data confirming COIs are below
applicable Standards at or beyond the compliance boundary, at which time a
request for completion of active remediation will be filed with NCDEQ.
If applicable standards are not met, the EMP will continue and transition to
post -closure monitoring if necessary.
PCMP Review
Annual Evaluation and Reporting:
1) Summary of annual groundwater monitoring results
2) Evaluate statistical concentration trends
2) Comparison of observed concentrations to model predictions
3) Evaluation 02L compliance
4) Recommend plan adjustments, if applicable
At a frequency no greater than 5 years:
1) Update background analysis
2) Confirm Risk Assessment assumptions remain valid
3) Verify model results, update if needed
After ash basin closure and following ash basin closure certification,
a PCMP will be implemented at the Site for a minimum of 30 years in
accordance with G. S. 130A-309.214(4)(k)(2).
Early termination:
If groundwater monitoring results are below applicable Standards at the
compliance boundary for three years, Duke Energy will request completion of
corrective action in accordance with G.S. 130A-309.214(a)(3)b. If groundwater
monitoring results are above applicable Standards, the PCMP will continue.
1 Approved background groundwater monitoring location
' Geochemically non -reactive constituent (i.e., conservative corrective anion COI) that best depicts the areal extent of the plume; monitors plume stability and physical attenuation
3 The number of monitoring wells and parameters may be adjusted based on additional data and the effects of corrective action.
4 Groundwater standards may be modified over time in accordance with 02L .0106(k)
3 Proposed extraction well to be installed as part of the remedial alternative
Italicized parameters - parameters for general water quality to evaluate monitoring data quality
Wells indicated in red will have geochemical sondes placed to monitor geochemical conditions
EAB - East ash basin
LCID - land clearing and inert debris
GSA - gypsum storage area
DFAHA - dry Fly ash silos, transport, and handling area
®'

TABLE 6-17
BORON CONCENTRATIONS IN GROUNDWATER BELOW SOURCE AREA 3
WEST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Well Beneath
Number of
Boron
Concentration
Boron Concentration
Ash
Sample
Time Period of
Range in
Range in Overlying
(Flow Zone)
Events
Analytical Data
Groundwater
Pore Water
(pg/�)
(p9/�)
ABMW-01BR
05/2015 -
10,000 - 12,900
(Bedrock)
15
04/2019
146 - 622
(z74' saturated ash)
ABMW-02BR
15
05/2015 -
<50 1
1,430 - 8,000
(Bedrock)
04/2019
(z73' saturated ash)
ABMW-03BR
05/2015 -
(Bedrock)
13
04/2019
2,770 - 4,650
136 - 1,130
(z3' saturated ash)
ABMW-03BRL
06/2016 -
(Bedrock)
13
04/2019
<50 - 192
Prepared by: KTL Checked by: CDE
Notes:
< - concentration not detected at or above the adjusted reporting limit.
1 - Concentrations have not been detected at or above the adjusted reporting limit across all sampling events
pg/L - micrograms per liter
Page 1 of 1

TABLE 6-18
SOURCE AREA INTERIM ACTIONS
WEST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Groundwater
Remedy
Component
Rationale
Coal ash basin decanting is active source remediation by removing
ponded water in the ash basin. Decanting will lower the hydraulic
head within the coal ash basin and reduce hydraulic gradients
Ash Basin Decanting
reducing groundwater seepage velocities and COI transport
potential. Decanting will return the groundwater flow system to its
approximate condition, prior to construction of the ash basin, with
the re-establishment of groundwater flowing toward the perennial
stream and then northward.
Source Area
Dam modifications included spillway repair and the need for
Stabilization
installation of a new spillway.
Prepared by: KTL Checked by: CDE
Page 1 of 1

TABLE 6-19
SUMMARY OF UNSATURATED SOIL SAMPLE ANALYTICAL RESULTS - WEST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Parameters
pH
Antimony
Boron
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Vanadium
Reporting Units
S.U.
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
PSRG Protection of Groundwater
NE
0.9
45
3.8
0.9
150
65
7.1
2.1
1500
1938^
350
2018 Background Threshold Values'
4.4-9.7
0.6
2.9
11
11
27147
532
2.8
1.60
39.2
11
69
2019 Background Threshold Valuesz
4.2-9.8
0.6
15
53
27
30601
590
2.8
1.60
65.7
296
122
Sample ID
Sample
Collection Date
Analytical Results
Background
BGSB-02 (4-5)
07/18/2017
6.8
<0.48 M
<5.7 M
39 M
19
35000 M
200 M
0.63 j,M
1.2 j
29 M
<11
120
BGSB-02 (7-8)
07/18/2017
7.4
<0.44
<2.5
4.5
5.5
7100
46
<2
0.3 j
7.9
<11
31
BGSB-14 (2-3)
07/19/2017
6.0
<0.53
2.7
22
3.9
21000
78
0.58j
0.31j
11
19
64
BGSB-14(4-5)
07/19/2017
5.4
<0.53
1.2j
9
6.6
22000
97
0.61j
0.53j
16
28
54
BGSB-14 (7-8)
07/19/2017
6.1
<0.52
1.1 j
7.4
8.5
19000
120
<2
0.57 j
31
<11
48
BGSB-14 (9-10)
07/19/2017
6.5
<0.47
<2.1
3.8
8
15000
110
<1.7
0.74 j
29
<10
45
BGSB-18 (2-3)
07/19/2017
7.2
<0.5
<2.7
15
5
15000
47
<2.1
0.65 j
9.9
7.6 j
47
BGSB-18 (4-5)
07/19/2017
7.1
0.21 j,B
<1.9
6.9
2.2
9700
39
<1.5
0.37 j
4.6
<11
19
BGSB-18 (7-8)
07/19/2017
7.0
0.096 j,6
<2.9
4.3
3.3
12000
82
<2.3
0.38 j
9
<12
20
BGSB-18 (9-10)
07/19/2017
7.7
<0.47
<2.4
5.2
4.3
9900
73
<1.9
0.74 j
8.6
<11
30
BGSB-18 (12-13)
07/19/2017
8.8
<0.4
<2.1
1.8
1.6
7200
61
<1.7
1
10
<10
9.6
BGSB-112 (2-3)
07/19/2017
5.5
<0.59
1.4 j
4.3
4.6
21000
160
0.62 j
0.35 j
7.7
13
43
BGSB-112 (4-5)
07/19/2017
5.7
<0.56
1.3 j
4.1
28
21000
1 360
<2.1
1.1 j
10
<12
36
BGSB-112 (7-8)
07/19/2017
5.3
0.27 j,B
<2.4
4.1
8.7
14000
110
<1.9
1.1 j
14
<11
39
BGSB-112 (9-10)
07/19/2017
7.6
<0.56
1.2j
2
14
23000
310
<2.2
0.99j
21
<12
36
BGSB-112 (14-15)
07/19/2017
7.6
<0.54
<2.8
7.3
8.9
17000
230
<2.2
0.33 j
1 23
<12
37
BGSB-112 (19-20)
07/19/2017
6.4
<0.43
0.98 j
3
7.1
15000
270
<1.8
0.49 j
18
<11
32
MW-14BR (1-1.25)
02/25/2015
4.8
<1.2
<3.1
4.1
5.3
16100
79.4
<0.62
<1.2
20.4
<300
45.2
MW-14BR (31-31.5)
02/25/2015
8.8
<1
<2.6
9
8.6
12600
238
<0.51
<1
22.4
<254
31
MW-14BR (37.5-38)
02/25/2015
8.0
<1.1
<2.8
54
15.8
15200
290
<0.55
<1.1
57.5
<286
33.3
MW-08 (14-16)
04/27/2015
7.6
<5.2
<13.1
0.82 j
4.6 j
10200
222
<2.6
<5.2
13.7
<263
21.6
MW-08 (21-23)
04/27/2015
7.3
<5.7
<14.2
17.4
15.3
20500
496
<2.8
<5.7
97.2
<283
43.1
MW-13BR (22-24)
03/04/2015
8.0
<1.2
9.2
8.7
8.1
1 13100
132
<0.6
<1.2
13.2
<299
59.3
MW-17 (29-31)
04/21/2015
8.4
<5.1
17.9
4.8
5.7
19800
1 315
<2.5
<5.1
18.8
<250
23
MW-18 (31-33)
05/16/2015
7.3
<6
<15
1.9
<6
7000
353
<3
<6
8
<292
3.11
MW-18 (37-38)
05/16/2015
7.3
<6.1
<15.3
1.3 j
<6.1
3410
175
<3.1
<6.1
6.7
<296
<6.1
Page 1 of 3

TABLE 6-19
SUMMARY OF UNSATURATED SOIL SAMPLE ANALYTICAL RESULTS - WEST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Parameters
pH
Antimony
Boron
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Vanadium
Reporting Units
S.U.
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
PSRG Protection of Groundwater
NE
0.9
45
3.8
0.9
150
65
7.1
2.1
1500
1938^
350
2018 Background Threshold Values'
4.4-9.7
0.6
2.9
11
11
27147
532
2.8
1.60
39.2
11
69
2019 Background Threshold Valuesz
4.2-9.8
0.6
15
53
27
30601
590
2.8
1.60
65.7
296
122
Sample ID
Sample
Collection Date
Analytical Results
WAB - Perimeter Soil Borings
PSB-06(1.5-2)
04/10/2019
5.6
<0.57
3
74
60
29000
1600
<2.3
0.66j
14
<13
96
PSB-07 (1.5-2)
04/10/2019
5.4
<0.59
<5.9
67
50
41000
1500
<2.4
<1.5
7.6
15
140
PSB-08 (1.5-2)
04/10/2019
6.0
<0.55
<8.3
70
42
36000
2300
<2.2
0.73 j
21
<13
110
PSB-09(1.5-2)
04/10/2019
5.6
0.76
<9
88
37
68000
790
<2.4
0.83j
23
22
150
PSB-10 (1.5-2)
04/10/2019
4.8
<0.54
1.4 j
25
9.7
10000
320
<2.1
<1.4
6.1
23
21
PSB-11 (1.5-2)
04/10/2019
5.6
<0.57
1 3
11
6.6
13000
380
<2.3
<1.5
11
9.8 j
19
PSB-12(1.5-2)
04/10/2019
5.6
<0.56
2.1j
17
5
14000
240
<2.3
<1.5
12
12j
19
PSB-13 (1.5-2)
04/10/2019
5.8
<0.58
<5.8
74
25
41000
600
<2.3
<1.5
28
<13
100
PSB-14 (1.5-2)
04/10/2019
5.4
<0.62
<3.1
32
7.7
20000
100
<2.5
<1.6
11
68
37
PSB-15 (1.5-2)
04/10/2019
4.9
<0.69
<3.4
42
7.7
15000
710
<2.7
0.83 j
6.1
14
28
PSB-16 (1.5-2)
04/10/2019
4.7
<0.63
<3.2
62
3.4
24000
87
<2.5
<1.6
5.5
12 j
57
PSB-17 (1.5-2)
04/11/2019
4.9
<0.59
<3
21
9.3
21000
180
<2.4
<1.5
11
13
34
PSB-18(1.5-2)
04/11/2019
5.4
<0.61
<3.1
51
24
29000
S10
<2.4
<1.6
22
<13
96
PSB-19 (1.5-2)
04/11/2019
5.1
<0.57
1.6 j
32
15
12000
360
<2.3
<1.5
11
7.7 j
34
PSB-20(1.5-2)
04/11/2019
5.1
<0.55
<8.2
52
25
30000
390
<2.2
0.58j
11
24
70
PSB-21 (1.5-2)
04/11/2019
5.2
0.45 j,M
2.1 j
48
23
18000 M
400 M
6.8
13
17
88
94 M
PSB-22 (1.5-2)
04/11/2019
5.7
<0.52
<7.8
59
28
35000
680
<2.1
<1.4
25
<13
99
PSB-23 (1.5-2)
04/11/2019
5.2
<0.64
<16
88
39
61000
920
<2.6
0.88 j
21
45
170
PSB-24 (1.5-2)
06/19/2019
5.3
<0.54 M
0.92 j
24
19
19000
510 M
<1.7
<1.4
13
16
51 M
PSB-25 (1.5-2)
06/19/2019
5.3
<0.49
2.1 j
41
29
44000
750
<2
0.54 j
20
19
120
PSB-26(1.5-2)
06/19/2019
5.3
<0.41
0.89j
19
12
18000
330
<1.7
<1.1
12
llj
57
PSB-27 (1.5-2)
06/19/2019
4.7
<0.48
2.1 j
26
13
39000
140
<1.9
<1.2
22
26
91
PSB-28(1.5-2)
06/19/2019
5.5
<0.54
<5.4
32
16
33000
310
<2.2
0.68j
23
<12
93
PSB-29 (1.5-2)
06/19/2019
6.1
<0.48
<4.8
55
18
36000
490
<1.9
<1.2
28
7.5 j
77
PSB-31(1.5-2)
06/19/2019
5.7
<0.43
1.9j
28
13
32000
380
<1.7
0.42j
29
25
67
PSB-32 (1.5-2)
06/19/2019
5.6
<0.64
<6.4
180
53
62000
2800
<2.5
0.69 j
24
37
150
PSB-33 (1.5-2)
06/19/2019
5.9
<0.56
<5.6
36
1 17
33000
420
<2.2
<1.5
25
10 j
91
PSB-34 (1.5-2)
06/19/2019
5.8
<0.58
<5.8
13
18
38000
350
<2.3
<1.5
28
23
110
PSB-35(1.5-2)
06/19/2019
5.9
<0.45
Sj
13
11
17000
300
<1.8
<1.2
14
6j
47
PSB-36(1.5-2)
06/19/2019
5.6
<0.53
<5.3
24
18
30000
570
<2.1
0.5j
17
12j
73
Page 2 of 3

TABLE 6-19
SUMMARY OF UNSATURATED SOIL SAMPLE ANALYTICAL RESULTS - WEST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Parameters
pH
Antimony
Boron
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Vanadium
Reporting Units
S.U.
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
PSRG Protection of Groundwater
NE
0.9
45
3.8
0.9
150
65
7.1
2.1
1500
1938^
350
2018 Background Threshold Values'
4.4-9.7
0.6
2.9
11
11
27147
532
2.8
1.60
39.2
11
69
2019 Background Threshold Valuesz
4.2-9.8
0.6
15
53
27
30601
590
2.8
1.60
65.7
296
122
Sample ID
Sample
Collection Date
Analytical Results
WAB - Within Ash Basin Compliance Boundary
MW-04 (0-2)
05/11/2015
7.7
<5.1
<12.8
27.9
14.3
19100
328
<2.6
<5.1
18.3
<258
49.8
MW-04 (23-25)
05/13/2015
8.3
<5.9
<14.9
81.8
13.7
13800
284
<3
<5.9
20
<300
29.4
MW-05BR (1-2)
03/26/2015
7.4
<2.8
<2.8
5.2
11.7
14400
235
<0.56
<2.8
18.3
178j
66
MW-05BR (5-6)
03/26/2015
7.3
<2.6
<2.6
32.9
16.6
8690
233
<0.53
<2.6
31.9
<267
27.3
SB-31 (0.5-1)
07/19/2017
4.9
<0.54
<4.8
34
44
27000
700
0.54 j
0.83 j
8.3
<11
77
MW-39D (2-4)
04/02/2019
5.7
<0.58
<2.9
14
2.5
11000
110
<2.3
<1.5
11
24
16
MW-39D (6-8)
04/02/2019
6.0
<0.55 M
<2.8
10
2.2
12000 M
330 M
<2.3
<1.4
13
17 M
13
MW-205BRL(4-5)
11/28/2018
5.1
<0.48
<2.4
2.8
3.5
11000
260
<1.9
<1.3
19
<10
17
MW-208BRL (4-5)
12/03/2018
6.7
<0.53 M
<5.3 M
39
18 M
34000 M
4SO M
<2.1
<1.4 M
30
<11
81
WAB - Outside Ash Basin Compliance Boundary
BG-01BR (0-2)
04/09/2015
5.8
<5.9
<14.8
4.7
<5.9
13800
70.1
<3
<5.9
6
<278
26.9
MW-06BR (0-2)
04/01/2015
6.2
<3
26.9
37.3
22.2
22700
663
<3
<3
14.7
<309
77.6
MW-07 (0-2)
04/15/2015
6.2
<7.8
<19.5
24.1
21.4
49400
358
<3.9
<7.8
20.2
<371
177
MW-08 (0-2)
04/27/2015
5.7
<6.9
<17.2
1.5 j
3.5 j
11200
87.4
<3.4
<6.9
14.6
<336
21.8
MW-09 (0-2)
04/30/2015
7.5
<7.3
<18.3
9.6
10
20100
322
<3.7
<7.3
41.9
<356
73.6
MW-10BR (0-2)
04/07/2015
5.6
<7.2
<18
10.7
5.6 j
31400
57.8
<3.6
<7.2
8.3
<359
94.7
MW-12 (0-2)
04/29/2015
7.3
<5.7
<14.2
10.5
<5.7
16500
269
<2.8
<5.7
22.8
<284
38.8
MW-15 (0-2)
04/17/2015
5.5
<6.6
30.9
120
26.3
50500
230
<3.3
<6.6
18.2
<335
201
MW-18 (0-2)
05/16/2015
5.7
<6.9
<17.1
2.8
<6.9
7680
39.1
<3.4
<6.9
6.1
<331
9.9
Prepared by: KTL Checked by: IRS
Notes:
' - Background threshold values were calculated using data from background unsaturated soil samples collected February 2015 to July 2017.
z - Updated background threshold values were calculated using data from background unsaturated soil samples collected February 2015 to July 2017. The background threshold value updates retained extreme outlier
concentrations in background unsaturated soil datasets (SynTerra, 2019).
Background data set includes sample locations from the East Ash Basin and West Ash Basin.
- bold highlighted concentration indicates value is greater than applicable regulatory standard (PSRG POG).
- bold highlighted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory standard.
PSRG - Preliminary Soil Remediation Goals for the Protection of Groundwater (POG); North Carolina Department of Environmental Quality (NCDEQ) Inactive Hazardous Sites Branch (IHSB) Preliminary Soil
Remediation Goals table (February 2018)
< - Concentration not detected at or above the adjusted reporting limit.
^ - PSRG Protection of Groundwater value was calculated using the equation shown in Section 6.
mg/kg - milligrams per kilogram
B - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample is less than 1OX the concentration in the method blank. Analyte concentration in sample
could be due to blank contamination.
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
M - Matrix spike / matrix spike dup failure.
NE - Not established
S.U. - Standard Units
Page 3 of 3

TABLE 6-20
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO APRIL 2019 - WEST ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Parameters
pH
Antimony
Boron
Chromium
VI
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Total Dissolved
Solids
Total Uranium
Vanadium
Reporting Units
S.U.
lag/L
lag/L
lag/L
lag/L
lag/L
lag/L
lag/L
lag/L
lag/L
lag/L
mg/L
mg/L
lag/mL
lag/L
15A NCAC 02L Standard
6.5 - 8.5
1*
700
NE
10
1*
300
50
NE
20
NE
250
500
NE
0.3*
2017 Background Threshold Values (Transition Flow Zone)'
6.3 - 7.6
1
50
17
25
1
1210
405
4
2
760
37
540
0.005
30
2019 Background Threshold Values (Transition Flow Zone )2
6.3 - 7.6
1
50
12
22
3
1293
260
8
2
760
38
710
0.004
23
2019 BTVs Data Set Range (Transition Flow Zone )2
6.3 - 7.6
< 1 - < 1
< 50 - < 50
1.60 - 13.1
1.26 - 42.7
< 1 - 4.01
12 - 1760
<5 - 820
< 1 - 9.9
< 1 - 3.57
221 - 782
11 - 48.1
248 - 750
<0.0002 - 0.00381
0.983 - 24.4
2017 Background Threshold Values (Bedrock Flow Zone)'
6.8 - 8.3
1
50
0.2
4
6
4227
1198
35
1
232
74
530
0.003
2
2019 Background Threshold Values (Bedrock Flow Zone )2
6.1 - 8.3
1
50
1
4
18
5130
1773
22
1
438
69
560
0.006
3
2019 BTVs Data Set Range (Bedrock Flow Zone )2
6.1 - 8.3
< 1 - < 1
< 50 - < 50
<0.025 - 1.7
< 1 - 9.27
< 1 - 21.7
< 10 - 6220
<5 - 1510
< 1 - 24.3
< 1 - 1.19
64 - 615
0.18 - 77
170 - 820
<0.0002 - 0.00605
<0.3 - 3.03
Sample ID
Flow Zone
Mean Result3
Background Locations4
BG-01
Transition
6.4
< 1
< 50
2.8
3.2
< 1
61.5
< 5
< 1
< 1
458
17.2
334
0.00055
18.3
BG-01BR
Bedrock
6.9
< 1
< 50
0.1
1.2
< 1
53.3
224
2.3
< 1
177
17.6
310
0.00082
2.1
BG-02BR
Bedrock
8.1
< 1
< 50
0.0
1.6
< 1
97.2
49.5
12.7
< 1
262
33.0
322
0.0031
0.35
CCR-112BR-BG
Bedrock
6.4
< 1
< 50
-
< 1
< 1
-
-
7.3
< 1
-
19.0
193
-
-
MW-10BR
Bedrock
6.9
< 1
< 50
0.2
< 1
14.6
11.5
187
11.0
< 1
173
39.6
330
0.0026
2.9
MW-14BR
Bedrock
7.2
< 1
< 50
< 0.025
1.1
3.1
1530
360
2.7
< 1
181
12.8
362
0.00025
0.28
MW-15BR
Bedrock
7.6
< 1
< 50
0.1
< 1
< 1
579
35.6
11.0
< 1
124
32.0
345
0.00067
0.27
MW-15D
Transition
6.6
< 1
< 50
3.0
2.9
< 1
40.0
< 5
< 1
< 1
236
29.3
398
0.00066
10.0
MW-18BR
Bedrock
7.9
< 1
< 50
< 0.025
< 1
1.3
1140
777
3.7
< 1
473
12.4
505
0.00048
< 0.3
MW-18D
Transition
7.0
< 1
< 50
7.3
6.8
< 1
112
52.0
2.7
< 1
652
32.1
579
0.0031
1.3
MW-19BRL
Bedrock
7.0
< 1
< 50
< 0.025
< 1
< 1
3928
1454
2.9
< 1
252
18.0
466
< 0.0002
0.35
MW-26BR
Bedrock
7.2
< 1
< 50
< 0.025
< 1
< 1
1950
542
15.4
< 1
1 259
66.8
512
-
0.32
MW-29BR
Bedrock
7.3
< 1
< 50
0.05
< 1
< 1
1 274
110
12.1
< 1
152
12.2
1 280
0.40
MW-30BR
Bedrock
6.9
< 1
< 50
< 0.025
< 1
< 1
2174
1074
4.8
< 1
301
62.7
477
-
0.25
Near or Within the Waste Boundary Locations
ABMW-01
Ash Pore Water
9.3
4.0
12380
0.097
< 1
< 1
11.2
< 5
2206
5.0
2062
186
388
< 0.0002
2.0
ABMW-01BR
Bedrock
6.9
< 1
552
0.040
< 1
< 1
1606
1004
2.5
< 1
178
19.8
342
< 0.0002
< 0.3
ABMW-02
Ash Pore Water
7.8
< 1
4638
< 0.025
< 1
< 1
2956
747
231
1.1
960
33.2
232
0.00045
1.8
ABMW-02BR
Bedrock
7.9
< 1
< 50
0.034
< 1
< 1
568
1154
8.8
< 1
537
83.4
426
0.00058
0.38
ABMW-03
Ash Pore Water
3.5
< 1
255
< 0.025
4.5
127
7514
7824
< 1
1.3
1 910
1642
1344
-
2.2
ABMW-03BR
Bedrock
5.5
< 1
3096
< 0.025
< 1
185
7728
19760
< 1
< 1
1782
2560
3720
2.3
ABMW-03BRL
Bedrock
7.7
< 1
< 50
< 0.025
< 1
< 1
442
37.5
1.8
< 1
818
496
866
< 0.3
CCR-200BR
Bedrock
6.9
< 1
< 50
-
< 1
< 1
-
-
1.4
< 1
-
43.8
383
-
CCR-201BR
Bedrock
6.1
< 1
< 50
-
< 1
17.1
-
-
2.2
< 1
-
3675
5675
-
-
CCR-202BR
Bedrock
6.4
< 1
2732
< 0.025
< 1
< 1
< 10
93
1.1
< 1
1190
2380
2780
0.0086
4.1
CCR-202D
Transition
6.3
< 1
2716
< 0.025
< 1
< 1
7.0
634
< 1
< 1
1400
2060
3100
0.0092
4.8
CCR-203BR
Bedrock
6.6
< 1
718
< 0.025
< 1
8.0
178
355
5.1
< 1
682
426
910
0.0067
3.4
CCR-203D4
Transition
6.5
< 1
505
-
< 1
4.9
-
-
0.723 j
< 1
-
340
790
-
-
CCR-203S
Shallow
6.2
< 1
< 50
< 1
41.3
< 1
< 1
8.2
710
CCR-204BR
Bedrock
6.8
< 1
6323
< 1
1.3
1.8
< 1
310
3175
CCR-205BR
Bedrock
6.3
< 1
5615
< 1
< 1
0.78
1.5
118
2675
CCR-206BR4
Bedrock
6.0
0.981 j
12100
4.65
27.8
1.19
< 1
230
3200
CCR-206S
Shallow
6.7
< 1
23725
< 1
5.1
1.2
< 1
348
1725
Page 1 of 3

TABLE 6-20
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO APRIL 2019 - WEST ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Parameters
pH
Antimony
Boron
Chromium
VI
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Total Dissolved
Solids
Total Uranium
Vanadium
Reporting Units
S.U.
lag/L
lag/L
lag/L
lag/L
lag/L
lag/L
lag/L
lag/L
lag/L
lag/L
mg/L
mg/L
lag/mL
lag/L
15A NCAC 02L Standard
6.5 - 8.5
1*
700
NE
10
1*
300
50
NE
20
NE
250
500
NE
0.3*
2017 Background Threshold Values (Transition Flow Zone)'
6.3 - 7.6
1
50
17
25
1
1210
405
4
2
760
37
540
0.005
30
2019 Background Threshold Values (Transition Flow Zone )2
6.3 - 7.6
1
50
12
22
3
1293
260
8
2
760
38
710
0.004
23
2019 BTVs Data Set Range (Transition Flow Zone )2
6.3 - 7.6
< 1 - < 1
< 50 - < 50
1.60 - 13.1
1.26 - 42.7
< 1 - 4.01
12 - 1760
<5 - 820
< 1 - 9.9
< 1 - 3.57
221 - 782
11 - 48.1
248 - 750
<0.0002 - 0.00381
0.983 - 24.4
2017 Background Threshold Values (Bedrock Flow Zone)'
6.8 - 8.3
1
50
0.2
4
6
4227
1198
35
1
232
74
530
0.003
2
2019 Background Threshold Values (Bedrock Flow Zone )2
6.1 -8.3
1
50
1
4
18
5130
1773
22
1
438
69
560
0.006
3
2019 BTVs Data Set Range (Bedrock Flow Zone )2
6.1 - 8.3
< 1 - < 1
< 50 - < 50
<0.025 - 1.7
< 1 - 9.27
< 1 - 21.7
< 10 - 6220
<5 - 1510
< 1 - 24.3
< 1 - 1.19
64 - 615
0.18 - 77
170 - 820
<0.0002 - 0.00605
<0.3 - 3.03
Sample ID
Flow Zone
Mean Result3
Near or Within the Waste Boundary Locations (Continued)
CCR-207BR
Bedrock
6.4
< 1
18900
< 1
26.6
1.5
< 1
380
4450
CCR-207S
Shallow
6.5
< 1
18958
-
1.1
1.8
-
-
225
< 1
-
350
3050
-
-
CCR-208BR
Bedrock
6.1
< 1
49700
0.2
5.0
36.7
5.6
7770
213
< 1
9370
1006
7220
0.0086
11.4
CCR-208S
Shallow
6.1
< 1
35800
-
< 1
7.1
-
-
124
< 1
-
908
4525
-
-
CCR-209BR
Bedrock
6.6
< 1
4328
< 1
15.1
61.9
< 1
24.8
705
CCR-209S
Shallow
6.7
< 1
3635
< 1
< 1
2.0
< 1
23.8
818
CCR-210BR
Bedrock
6.5
< 1
2513
< 1
3.3
24.0
< 1
7.9
455
CCR-210S
Shallow
6.7
< 1
936
< 1
2.5
9.6
< 1
10.8
398
CCR-211BR
Bedrock
6.3
< 1
1963
< 1
1.2
4.9
< 1
42.5
365
CCR-211S
Shallow
6.5
< 1
3148
< 1
6.6
21.8
< 1
48.8
480
CCR-212BR
Bedrock
5.9
< 1
< 50
1.8
< 1
0.79
< 1
38
270
CCR-213BR
Bedrock
6.4
< 1
< 50
< 1
< 1
< 1
< 1
50.3
793
CCR-214BR
Bedrock
7.0
< 1
< 50
< 1
< 1
1.5
< 1
53.3
425
CCR-215BR
Bedrock
6.8
< 1
< 50
< 1
< 1
9.0
< 1
54.5
408
CCR-216BR
Bedrock
6.6
< 1
< 50
< 1
< 1
1.1
1.0
43
440
CCR-217BR
Bedrock
6.6
< 1
< 50
< 1
< 1
2.5
0.63
44.8
378
CCR-218BR
Bedrock
6.5
< 1
< 50
< 1
< 1
-
-
2.7
< 1
-
44.3
340
-
CW-034
Transition
5.6
< 1
< 50
-
< 5
< 1
377
130
< 1
< 1
287
52
290
2.12
CW-03D
Bedrock
7.4
< 1
< 50
0.10
< 1
< 1
44.3
27.2
2.9
< 1
277
32.5
343
2.5
CW-04
Transition
6.6
< 1
< 50
0.25
< 1
< 1
23.6
< 5
5.9
< 1
189
38.8
342
-
2.3
MW-02
Shallow
6.0
< 1
3336
0.11
1.1
1.0
127
69.6
< 1
< 1
2414
209
2488
0.0043
5.0
HWMW-01BR4
Bedrock
7.3
< 1
28.152 j
0.04
0.392 j
< 1
240
70
2.06
< 1
361
140
475
0.000956
0.205 j
MW-04BR
Bedrock
7.6
< 1
< 50
0.045
< 1
< 1
263
71.2
6.4
< 1
279
32.4
282
-
0.51
MW-12BR
Bedrock
7.2
< 1
< 50
< 0.025
< 1
12.6
3064
1220
5.3
< 1
247
37.4
432
-
0.31
MW-205BRL4
Bedrock
6.7
< 1
6350
0.03
0.336 j
3.3
84
1860
2.13
< 1
687
100
1960
0.000444
0.693
MW-205BRLL4
Bedrock
6.9
< 1
7860
<0.025 P4
< 1
0.338 j
3810
1620
2.22
< 1
914
290
2510
0.00411
0.368
MW-205BRLLL4
Bedrock
7.2
1.9
17900
<0.025 P4
4.97
1.25
7120
2940
1.29
< 1
2660
580
4730
0.0078
0.669
MW-208BRL4
Bedrock
7.5
< 1
678
0.031
< 1
0.463 j
1060
402
4.15
< 1
448
150
703
0.000688
0.411
MW-208BRLL4
Bedrock
7.9
< 1
1 1850
<0.025
1.54
< 1
1333
785
1.99
< 1
627
160
1440
0.000195 j
0.264 j
MW-208BRLLL4
Bedrock
7.3
< 1
1390
0.034
0.469 j
< 1
480
901
1.27
< 1
1340
730
2190
0.00652
0.848
Near or Beyond the Compliance Boundary Locations
BG-01BRLR
Bedrock
8.3
< 1
< 50
0.069
1.1
< 1
84.3
192
21.6
< 1
647
92.5
475
0.020
0.61
CW-02
Transition
6.6
< 1
< 50
0.24
< 1
< 1
420
118
< 1
< 1
386
79.7
430
0.0020
23.2
CW-02D
Bedrock
6.6
< 1
< 50
0.42
< 1
< 1
10.0
< 5
< 1
< 1
324
130
416
0.0014
13.0
Page 2 of 3

TABLE 6-20
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO APRIL 2019 - WEST ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Analytical Parameters
pH
Antimony
Boron
Chromium
VI
Chromium
Cobalt
Iron
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Total Dissolved
Solids
Total Uranium
Vanadium
Reporting Units
S.U.
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
mg/L
lag/mL
pg/L
15A NCAC 02L Standard
6.5 - 8.5
i*
700
NE
10
1*
300
50
NE
20
NE
250
500
NE
0.3*
2017 Background Threshold Values (Transition Flow Zone)'
6.3 - 7.6
1
50
17
25
1
1210
405
4
2
760
37
540
0.005
30
2019 Background Threshold Values (Transition Flow Zone )2
6.3 - 7.6
1
50
12
22
3
1293
260
8
2
760
38
710
0.004
23
2019 BTVs Data Set Range (Transition Flow Zone )2
6.3 - 7.6
< 1 - < 1
< 50 - < 50
1.60 - 13.1
1.26 - 42.7
< 1 - 4.01
12 - 1760
<5 - 820
< 1 - 9.9
< 1 - 3.57
221 - 782
11 - 48.1
248 - 750
<0.0002 - 0.00381
0.983 - 24.4
2017 Background Threshold Values (Bedrock Flow Zone)'
6.8 - 8.3
1
50
0.2
4
6
4227
1198
35
1
232
74
530
0.003
2
2019 Background Threshold Values (Bedrock Flow Zone )2
6.1 - 8.3
1
50
1
4
18
5130
1773
22
1
438
69
560
0.006
3
2019 BTVs Data Set Range (Bedrock Flow Zone )2
6.1 - 8.3
< 1 - < 1
< 50 - < 50
<0.025 - 1.7
< 1 - 9.27
< 1 - 21.7
< 10 - 6220
<5 - 1510
< 1 - 24.3
< 1 - 1.19
64 - 615
0.18 - 77
170 - 820
<0.0002 - 0.00605
<0.3 - 3.03
Sample ID
Flow Zone
Mean Result3
Near or Beyond the Compliance Boundary Locations (Continued)
CW-05
Transition
6.5
< 1
246
0.32
< 1
< 1
10.3
< 5
< 1
< 1
284
172
432
0.00025
27.7
MW-05BR
Bedrock
7.2
< 1
51.8
< 0.025
< 1
5.7
456
363
1.9
< 1
222
536
0.0049
0.75
MW-05D
Transition
6.5
< 1
687
0.90
0.97
< 1
11.2
10.0
4.3
< 1
402
382
654
0.00035
14.1
MW-06BR4
Bedrock
7.4
< 1
< 50
< 0.025
0.396 j
< 1
294
78
0.844 j
< 1
164
21
240
0.000392
0.159 j
MW-06D4
Transition
6.6
< 1
< 50
0.035
0.383 j
< 1
7.296 j
3.533 j
0.246 j
0.506 j
166
33
210
0.000212
6.01
MW-07BR
Bedrock
7.1
< 1
< 50
0.14
< 1
< 1
56.3
26.4
1.9
< 1
107
25.2
208
-
13.5
MW-08BR
Bedrock
7.2
< 1
< 50
< 0.025
0.91
< 1
1828
757
2.3
< 1
216
26.3
382
-
0.53
MW-09BR
Bedrock
6.5
< 1
< 50
< 0.025
< 1
1.1
126
127
0.74
< 1
221
23.5
227
0.00025
5.8
MW-31BR
Bedrock
6.9
< 1
< 50
0.060
1.2
< 1
35.5
338
0.94
1.7
326
34.8
392
-
MW-32BR
Bedrock
7.6
< 1
< 50
0.045
1.3
< 1
356
139
2.3
< 1
1635
350
678
0.34
MW-33BR
Bedrock
12.4
-
< 50
-
-
-
-
-
-
-
-
-
-
-
-
MW-39BR4
Bedrock
8.5
0.492 j
< 50
0.64
1.68 B2
< 1
13
62
2.24
< 1
367
30
310
0.00365
1.05
MW-39D4
Transition
6.1
5.63
< 50
0.085
0.629 j,B2
0.648 j
45
65
0.512 j
< 1
103
25
200
0.0000761 j
1.44
Notes:
1 - Background threshold values were calculated using data from background groundwater samples collected November 2010 to January 2017.
Z - Background threshold values were calculated using data from background groundwater samples collected November 2010 to Nobember 2018.
3 Statistical mean calculated from data ranging from January 2018 to June 2019. Ash pore water results are not compared to groundwater standards or criteria.
4 - Wells with datasets containing fewer than four valid results, the most recent valid sample data up to June 2019 was used.
Mean values have been rounded to similar levels of precision as 15A North Carolina Administrative Code (NCAC) 02L Standard or Interim Maximum Allowable Concentration (IMAC).
Background values have not been established for the shallow flow zone at this time, therefore, data sets are compared to transitional flow zone criteria for comparison purposes only.
Mean or geomean results were used based on the central tendency of the data set.
Means were calculated for wells with four or more valid sample results. Sample results were excluded from calculations:
1) if turbidity >10 NTU (for COIs other than boron)
2) for unusable data (RO qualified)
3) if a result was non -detect at a reporting limit (RL) greater than the normal laboratory RL
0 bold highlighted concentration indicates value is greater than the 15A NCAC 02L .0202 Standard or the IMAC. (Effective date for 15A NCAC 02L .0202 Standard and IMAC is April 1, 2013)
- bold highlighted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory standard
O - highlighted concentration indicates value is within range of background threshold values for constituents where there is no regulatory standard, or background threshold values are greater than regulatory standard
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
< - concentration not detected at or above the adjusted reporting limit.
- - no available data to conduct mean analysis
BTVs - Background Threshold Values
B2 - Target analyte was detected in blank(s) at a concentration greater than 1/2 the reporting limit but less than the reporting limit. Analyte concentration in sample is valid and may be used for compliance purposes.
COIs - Constituents of Interests
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
NE - not established
mg/L - milligrams per liter
NTUs - Nephelometric Turbidity Units
pCi/L - picocuries per liter
P4 - Sample field preservation does not meet EPA or method recommendations for this analysis.
pg/L - micrograms per liter
RO - The data are unusable. The sample results are rejected due to serious deficiencies in meeting QC criteria. The analyte may or may not be present in the sample.
S.U. standard unit
Prepared by: KTL Checked by: TAW
Page 3 of 3

TABLE 6-21
COI MANAGEMENT MATRIX - WEST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Constituent Standards and Values - 02L Criterion
Lines of Evide
- 02L Criterion
Rationale - 02L Criterion
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Boron is not present at concentrations above COI criterion in transition zone or
bedrock groundwater near or beyond compliance boundary. Boron is mapped as
Boron
700 (pg/L)
Transition Zone
50
50
<50
<50
50- 176.8
687
0.98
0
Y
0
0
0
N
Conservative
primary COI migration indicator parameter for transition zone and bedrock
groundwater for CAP evaluation. Plume -like distribution within compliance
boundary.
Bedrock
50
50
<50
51.8
0.07
0
0
0
0
N
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Chromium (Total)
10 (pg/L)
Transition Zone
25
22
1.26 - 42.7
<3 - 42.7
1 - 26
0.97
N
0
0
0
N
Variable
No means greater than comparison criteria near or beyond the compliance
boundary. Does not warrant corrective action.
0.04
0
0.17
0
Bedrock
4
4
<1 - 9.27
1.68 B2
0
0
0
N
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Iron
300 (pg/L)
Transition Zone
1210
1293
12 - 1760
<10 - 6220
56.3 - 37500
420
Y
0
0
0
N
Variable
No means greater than comparison criteria near or beyond the compliance
boundary. Does not warrant corrective action.
0.32
0
0.36
0
Bedrock
4227
5130
<10 - 6220
1828
0
0
0
N
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Manganese
50 (pg/L)
Transition Zone
405
260
<5 - 820
<5 - 1510
7 - 9170
130
Y
0
0
0
N
Variable
No means greater than comparison criteria near or beyond the compliance
boundary. Does not warrant corrective action.
0.50
0
0.43
0
Bedrock
1198
1773
<5 - 1510
757
0
0
0
N
J
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Selenium
20 (pg/L)
Transition Zone
2
2
<1 - 3.57
<1 - 3.57
0.5 - 2.4
0.506 j
N
0
0
0
N
Variable
J1
No means greater than comparison criteria near or beyond the compliance 1
boundary. Does not warrant corrective action.
0.03
0
0.09
0
Bedrock
1
1
<1 - 1.19
1.7
0
0
0
N
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
1
Plume -like distribution of sulfate coincident with boron within ash WAB waste
boundary and at transition zone well MW-05D (associated with decommissioned
1.53
1
MW-SD
Sulfate
250 (mg/1)
Transition Zone
37
38
11 - 46.1
0.18 - 77
1.2 - 510
382
Y
1
1
0
Y
Conservative
sluice line). Boron is not present at concentrations above COI criterion near or
beyond compliance boundary. Isolated detection of sulfate above COI criterion at
hydraulically upgradient bedrock well MW-32BR. Boron is not detected in
1.4
1
MW-32BR
Bedrock
74
69
0.18 - 77
350
1
1
0
y
groundwater at MW-32BR.. Does not warrant corrective action.
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Plume -like distribution of TDS coincident with boron within WAB waste boundary
and at transition zone well MW-05D (associated with decommissioned sluice line).
0.92
0
Total Dissolved Solids
500 (mg/1)
Transition Zone
540
710
248 - 750
<170 - 820
50 - 1200
654
Y
0
0
0
Y
Conservative
Boron is not present at concentrations above COI criterion near or beyond
compliance boundary. Isolated detection of TDS above COI criterion at
hydraulically upgradient bedrock well MW-32BR. Boron is not detected in
1.21
1
MW-32BR
Bedrock
530
560
170 - 820
678
0
0
0
y
groundwater at MW-32BR.. Does not warrant corrective action.
Constituent Standards and Values - IMAC Criterion
NA NA
Lines of Evidence (LOE) - IMAC Criterion
Rationale - IMAC Criterion
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
One mean is greater than comparative criteria associated with newly installed MW-
Antimony
1 (pg/L)
Transition Zone
1
1
<1
<1
0.5 - 2.9
5.63
5.63
1
MW-39D
N
1
1
1
Y
Conservative
39D positioned upgradient at compliance boundary. Not positioned within
conservative group plume. Does not warrant corrective action.
0.49
0
Bedrock
1
1
<3
0.492 j
0
0
0
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Cobalt
1 (pg/L)
Transition Zone
1
3
< 1 - 4.01
<3 - 21.7
0.088 - 88.85
0.648 j
y
0
0
0
N
Variable
No means greater than comparison criteria near or beyond the compliance
boundary. Does not warrant corrective action.
0.22
0
0.32
0
Bedrock
6
18
< 1- 21.7
5.7
0
0
0
N
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Vanadium
0.3 (pg/L)
Transition Zone
30
23
0.983 - 24.4
<0.3 - 24.4
0.33 - 25.8
27.7
N
0
0
0
N
Non -Conservative
MW-7BR positioned upgradient and CW-2D and MW-9BR positioned
downgradient. Not positioned within conservative group plume.
1.20
0
4.49
1 3
1 CW-2D, MW-7BR, 1111-9BR
Bedrock
2
3
<0.3 - 3.03
13.5
3
0
0
1

TABLE 6-21
COI MANAGEMENT MATRIX - WEST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Constituent Standards and Values - Background Criterion
Lines
ence
ckground Criterion
Rationale -Background Criterion
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Chromium (Nexavalent)
NE (pg/L)
<0.025 - 13.1
0.03 - 12
N
Variable
No means greater than comparison criteria near or beyond the compliance
boundary. Does not warrant corrective action.
Transition Zone
17
12
1.60 - 13.1
0.90
0.07
0
0
0
0
N
Bedrock
0.2
1
<0.025 - 1.7
0.64
0.64
0
0
0
0
N
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Molybdenum
NE (pg/L)
<1 - 24.3
0.5 - 26.2
Y
Variable
No means greater than comparison criteria near or beyond the compliance
boundary. Does not warrant corrective action.
Transition Zone
4
8
< 1 - 9.9
4.3
0.54
0
0
0
0
N
Bedrock
35
22
< 1 - 24.3
6.4
0.29
0
0
0
0
N
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Boron is not present at concentrations above COI criterion near or beyond
Transition Zone
760
760
221 - 782
402
0.53
0
0
0
0
N
Strontium
NE (pg/L)
64 - 782
27 - 2,120
Y
Variable
compliance boundary. Isolated detections of strontium greater than background at
hydraulically upgradient wells BG-1BRLRL and MW-32BR. Boron is not detected in
groundwater at BR-1BRLR and MW-32BR.. Does not warrant corrective action.
Bedrock
232
438
64 - 615
647
1.48
2
BG-1BRLR, MW-32BR
2
0
0
Y
Shallow
NE
NE
NE
NA
NA
NA
NA
NA
NA
NA
NA
Uranium (Total)
NE (pg/mL)
0.0002 - 0.00605
0.0002 - 0.864
Y
Non -Conservative
No means greater than comparison criteria near or beyond the compliance
boundary. Does not warrant corrective action.
Transition Zone
0.005
0.004
<0.0002 - 0.00381
0.0020
0.49
0
0
0
0
N
Bedrock
0.003
0.006
<0.0002 - 0.00605
0.020
3.33
1
BG-SBRLR
0
0
0
N
Notes:
0 - Reference Criterion
0 - Evidence supports inclusion
- Evidence supports exclusion
-Constituent list reflects the constituents of interest identified in the 2017 CSA Update (SynTema, 2017).
- Background values were calculated using data from background groundwater samples collected November 2010 to January 2017.
3 - Updated background values were calculated using data from background groundwater samples collected November 2010 to November 2018.
° - The exceedance ratio is the ratio of the observed constituent concentration divided by the reference criterion.
s - Assignment of conservative, non -conservative, or variable behavior is based on geochemical modeling results.
< - less than
Notes:
APW - ash pore water
COI - constituent of Interest
CSA - Comprehensive Site Assessment
pg/L - micrograms per liter
mg/L - milligrams per liter
NA - Not Applicable
NE - Not Established
Y - Yes
N - No
Prepared by: KTL Checked by. A

TABLE 6-22
SUMMARY OF TREND ANALYSIS RESULTS FOR GROUNDWATER MONITORING WELLS - WEST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Wells Within the Waste Boundary
Well ID
Boron
Sulfate
Tota I
Dissolved
Solids
Bedrock Flow Zone
=03BRL
D
S
S
D
D
D
T
S
S
Wells Between Waste Boundary
and Compliance Boundary
Well ID
Boron
Sulfate
Total
Dissolved
Solids
Shallow Flow Zone
CCR-203S
ND NT
D
CCR-206S
D D
D
CCR-207S
NT
NT
CCR-208S
S
CCR-209S JFN
SCCR-210S
D
D
CCR-211S
S
S
MW-01 E NE NE
MW-02
Transition Flow Zone
CCR-202D
S
CCR-203D
S
CW-03
ND D
D
Bedrock Flow Zone
CCR-200BR
ND
S
S
CCR-201BR
ND
NT
CCR-202BR
S
NT
CCR-203BR
S
S
CCR-204BR
CCR-205BR
CCR-206BR
CCR-207BR
S
S
NT
CCR-208BR
S
S
NT
CCR-209BR
S
CCR-210BR
S
S
S
CCR-211BR
S
S
S
CW-03D
ND
S
HWMW-OIBR
NE
NE
NE
MW-12BR
ND
S
MW-205BRL
NE
NE
NE
MW-205BRLL
NE
NE
NE
MW-205BRLLL
NE
NE
NE
MW-208BRL
NE
NE
NE
MW-208BRLL
NE
NE
NE
MW-208BRLLL
NE
NE
NE
Wells Downgradient of the Source Area
At or Beyond Compliance Boundary
Well ID
Boron
Sulfate
Total
Dissolved
Solids
Transition Flow Zone
CW-02
ND
S
CW-05
D
D
D
MW-05D
D
D
D
MW-06D
ND
D
D
Bedrock Flow Zone
CW-02D
MW-05BR
ND
ND
MW-06BR
ND
S
MW-08BR
ND
S
MW-09BR
ND
MW-31BR
ND
S
S
MW-32BR
MW-33BR
ND
S
NE
NE
Mann -Kendall trend analysis and results prepared by Arcadis U.S. Inc.
Notes:
1. Summary of results and trends are presented for samples collected from 2010 - 2019.
2. Trend results are presented when at least four samples were available and frequency of detection was >50 % . Statistically significant trends are reported at the 95 % confidence level.
3. Variability Index (VI) is calculated as the (maximum - minimum) / median concentration and is calculated using detected concentrations only. Values less than 1 indicate low variability in the dataset.
ND = Greater than 50 percent of constituent concentrations were non -detect
D = Statistically significant, decreasing concentration trend
S = Stable. No significant trend and variability is low (VI <_ 1)
= No significant trend and variability is high (VI > 1)
= Statistically significant, increasing concentration trend.
NE = Insufficient number of samples to evaluate trend (n < 4)
Page 1 of 1

c
0
to
0
E
m
6
O
o`
rn
c
•L
0
c
0
Z
TABLE 6-23
GROUNDWATER CONFIRMATION MONITORING PLAN ELEMENTS
WEST ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Confirmation Monitoring Plan (CMP) Post -Closure Monitoring Plan (PCMP)
Implemented 30 days after CAP Approval Implemented after completion of ash basin closure activities
CMP
Groundwater Well Monitoring Network
(background, downgradient of ash
basin)
BG-1'
CCR-204BR
CW-5
BG-1BR'
CCR-205BR
HWMW-1BR
BG-2BR'
CCR-206S
MW-2
MW-10BR'
CCR-206BR
MW-5D
MW-15D'
CCR-207S
MW-5BR
MW-15BR'
CCR-207BR
MW-8BR
MW-18D'
CCR-208S
MW-9BR
MW-18BR'
CCR-208BR
MW-12BR
MW-26BR'
CCR-209S
MW-32BR
CCR-200BR
CCR-209BR
MW-33BR
CCR-201BR
CCR-210BR
MW-205BRL
CCR-202D
CCR-210S
MW-205BRLL
CCR-202BR
CCR-211S
MW-205BRLLL
CCR-203S
CCR-211BR
MW-208BRL
CCR-203D
CW-2
MW-208BRLL
CCR-203BR
CW-2D
MW-208BRLLL
PCMP Groundwater Well Monitoring Network
(background, downgradient of ash basin)
A PCMP will be implemented at the Site in accordance with
G.S. 130A-309.214(a)(4)k.2 after completion of
ash basin closure activities.
CMP Groundwater Quality' PCMP Groundwater Quality
(Semi -Annual Sampling Frequency) (Sampling frequency to be determined)
Boron Calcium Nitrate + Nitrite
Alkalinity Chloride Potassium Parameters and sampling frequency to be included in the PCMP in
Aluminum Ferrous Iron Sodium accordance with G.S. 130A-309.214(a)(4)k.2 when submitted.
Bicarbonate Alkalinity Magnesium Total Organic Carbon
CMP and PCMP Groundwater Field Parameters
Water Level Specific Conductivity Temperature
pH Oxidation Reduction Potential Dissolved Oxygen
CMP Review
(Annual Reporting)
1) Summary of annual groundwater monitoring results
2) Evaluation of statistical concentration trends
2) Comparison of observed concentrations to model predictions
3) Evaluation of 02L compliance
4) Recommend plan adjustments, if applicable
CMP Duration
30 days after CAP approval, the CMP will be implemented at the Site and
will continue until there is a total of three years of data confirming COIs
are below applicable Standards at or beyond the compliance boundary, at
which time a request for termination of CMP sampling will be filed with
NCDEQ.
If applicable standards are not met, the CMP will continue and transition
to post -closure monitoring if necessary.
PCMP Review
(Annual Reporting)
1) Summary of annual groundwater monitoring results
2) Evaluation of statistical concentration trends
2) Comparison of observed concentrations to model predictions
3) Evaluation of 02L compliance
4) Recommend plan adjustments, if applicable
At a frequency no greater than 5 years:
1) Update background analysis
2) Confirm Risk Assessment assumptions remain valid
3) Verify model results, update if needed
PCMP Duration
After ash basin closure and following ash basin closure
certification, a PCMP will be implemented at the Site for a minimum of
30 years in accordance with G.S. 130A-309.214(a)(4)k.2.
Early termination:
If groundwater monitoring results are below applicable standards for
three years, Duke Energy to request termination of corrective action in
accordance with G.S. 130A-309.214(a)(3)b. If groundwater monitoring
results are above applicable standards, continue groundwater
monitoring and evaluate annually thereafter.
' Approved background groundwater monitoring location
2 Geochemically non -reactive constituent (i.e., conservative corrective action COI) that best depicts the areal extent of the plume; monitors plume stability and physical attenuation
3 Parameters are subject to change based on additional data and investigation
Italicized parameters - parameters for general water quality to evaluate monitoring data quality
Wells indicated in red will have geochemical sondes placed to monitor geochemical conditions
Page 1 of 1

TABLE 6-24
ALTERNATIVE 3 EXTRACTION AND CLEAN WATER INFILTRATION
WELL SUMMARY - SOURCE AREA 3
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Groundwater Extraction Well System
Number of Wells
Flow Zone
Total Depth
(ft bgs)
18
All
Up to 180
Total Extraction Well Count: 18
System flow and operation assumptions:
Flow rate: 2.6 gpm per well. Total system extraction flow rate of about 48 gpm.
Extraction wells operate to maintain water level near bottom of the well.
Extraction wells screened through all three zones
Clean Water Infiltration Well System
Total Depth
Number of Wells
Flow Zone
(ft bgs)
27
Transition/Bedrock
Up to 180
Total Well Count: 27
System flow and operation assumptions:
Flow rate: 2.8 gpm per well. Total system recharge flow rate of approximately 76 gpm.
Clean water infiltration wells operate with pressure head set to 20 feet above the ground surface.
Notes:
ft bgs - feet below ground surface
gpm - gallons per minute
Prepared by: JEC Checked by: GTC
Page 1 of 1

TABLE 6-25
ENVIRONMENTAL SUSTAINABILITY COMPARISONS FOR REMEDIATION ALTERNATIVES
SOURCE AREA 3
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Remedial Alternative
Remedial Alternative 1 —Groundwater
Remediation by MNA
Remedial Alternative 2 —Groundwater
Remediation by Extraction
Remedial Alternative 3 — Groundwater
Remediation by Clean Water Infiltration and
Extraction
Emissions
Units
COZ Emissions
metric ton
1.14E+00
9.53E+03
2.85E+03
Onsite NO, emissions
metric ton
0.00E+00
3.47E-01
9.21 E+00
Onsite SOX Emissions
metric ton
0.00E+00
3.54E-02
9.41 E-01
Onsite PM10 Emissions
metric ton
0.00E+00
3.12E-02
8.28E-01
Total NOx emissions
metric ton
4.23E-04
3.45E+01
1.49E+01
Total SOx Emissions
metric ton
1.49E-05
3.17E+01
5.01 E+00
Total PM10 Emissions
metric ton
8.58E-05
3.80E+00
3.29E+00
Total Energy Used
MMBTU
1.44E+01
8.43E+05
1.67E+06
Total Emissions
metric ton
1.14E+00
9.60E+03
2.89E+03
Notes:
COZ - Airborne emissions of carbon dioxide
MMBTU - Million British Thermal Units
NOx - Airborne emissions of nitrogen oxides (combination of nitrogen monoxide and nitrogen dioxide)
SOX - Airborne emissions of sulfur oxides (combination of sulfur monoxide, sulfur dioxide, sulfur trioxide, and others)
PMlo - Airborne emissions of particulate matter that is 10 micrometers or less in diameter
Prepared by: GTC Checked by: SJB
Page 1 of 1

TABLE 6-26
MODELED CLEAN WATER INFILTRATION WELL DETAILS - SOURCE AREA 3
CORRECTIVE ACTION PLAN UPDATE
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Well ID
Easting
(ft NAD 83)
Northing
(ft NAD 83)
Approximate Ground
Surface Elevation
(ft NAVE) 88)
Pressure at Well Head
(ft of Head Above
Ground Surface)
Well
Depth
(ft BGS)
Targeted Flow Zones
Total
Simulated Flow
(gpm)
Clean Water Infiltration Wells
IW-1
1980653.83
994933.36
422
20
140
Shallow/Transition Zone/Bedrock
2.9
IW-2
1980755.43
994976.46
428
20
140
Shallow/Transition Zone/Bedrock
3.2
IW-3
1980824.75
995028.69
433
20
140
Shallow/Transition Zone/Bedrock
19.2
IW-4
1980949.13
995073.86
430
20
140
Shallow/Transition Zone/Bedrock
4.0
IW-5
1981056.93
995118.86
428
20
140
Shallow/Transition Zone/Bedrock
2.9
IW-6
1981154.03
995159.06
430
20
140
Shallow/Transition Zone/Bedrock
2.7
IW-7
1981244.03
995208.86
430
20
140
Shallow/Transition Zone/Bedrock
2.4
IW-8
1981302.40
995227.90
431
20
140
Shallow/Transition Zone/Bedrock
2.4
IW-9
1981351.73
995253.86
432
20
140
Shallow/Transition Zone/Bedrock
2.2
IW-10
1981405.48
995270.31
430
20
140
Shallow/Transition Zone/Bedrock
2.5
IW-11
1981453.63
995295.26
430
20
140
Shallow/Transition Zone/Bedrock
2.0
IW-12
1981481.00
995310.20
433
20
140
Shallow/Transition Zone/Bedrock
2.3
IW-13
1981549.53
995337.86
429
20
140
Shallow/Transition Zone/Bedrock
2.7
IW-14
1981643.03
995391.16
425
20
140
Shallow/Transition Zone/Bedrock
2.5
IW-15
1981750.83
995432.66
429
20
140
Shallow/Transition Zone/Bedrock
2.9
IW-16
1981850.33
995476.46
426
20
140
Shallow/Transition Zone/Bedrock
2.8
IW-17
1981949.73
995515.56
434
20
140
Shallow/Transition Zone/Bedrock
3.1
IW-18
1982049.23
995560.56
433
20
140
Shallow/Transition Zone/Bedrock
1.6
IW-19
1982140.83
995610.86
433
20
140
Shallow/Transition Zone/Bedrock
1.0
IW-20
1982243.33
995653.16
433
20
140
Shallow/Transition Zone/Bedrock
0.8
IW-21
1982279.51
995671.83
433
20
140
Shallow/Transition Zone/Bedrock
0.5
IW-22
1982317.40
995684.00
430
20
140
Shallow/Transition Zone/Bedrock
0.5
IW-23
1982346.03
995699.26
430
20
140
Shallow/Transition Zone/Bedrock
0.6
IW-24
1982404.51
995716.61
426
20
140
Shallow/Transition Zone/Bedrock
0.7
IW-25
1982451.73
995738.96
428
20
140
Shallow/Transition Zone/Bedrock
2.1
IW-26
1982545.93
995794.46
430
20
140
Shallow/Transition Zone/Bedrock
2.7
IW-27
1982641.23
995831.16
430
20
140
Shallow/Transition Zone/Bedrock
2.7
Notes:
All depths are approximated and may change depending on site conditions.
Flowrates are approximate and may change depending on site conditions.
DTW - depth to water
ft - feet
ft BGS - feet below ground surface
gpm - gallons per minute
NA - Not applicable
NAD 83 - North American Datum 1983
NAVD 88 - North American Vertical Datum of 1988
Prepared by: GTC Checked by: KTL
Page 1 of 1