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Home My WebLink AboutNC0004979_Errata_20200505synTerra CORRECTIVE ACTION PLAN UPDATE REVISION 1: APRIL 23, 2020 Site Name and Location: Allen Steam Station 253 Plant Allen Road Belmont, NC 28012-8845 Groundwater Incident No.: Not Assigned NPDES Permit No.: NC0004979 NCDEQ CCR Impoundment Ranking: Low -Risk Date of Report: December 31, 2019 Permittee and Current Duke Energy Carolinas, LLC Property Owner: 526 South Church Street Charlotte, NC 28202-1803 (855) 355-7042 Consultant Information: SynTerra Corporation 148 River Street, Suite 220 Greenville, SC 29601-2567 (864) 421-9999 Latitude and Longitude of Facility: N 35.186944 / W-81.012500 ris , rf ` . Suttell, !' g LG 2426 s C (J..... a 9 er Ja CI NCrPE a8675 jec4 Erfnineer • �E ,f��'post, rrCseE►`'► FIGURES A __ (NORTH) LIVE COAL PILE — I I JTV I I I I — L — — — — COMPLIANCE BOUNDARY (SOUTH) ' G�0] u1K1u�ufYYNN a CNtAC��OD) olaaa fit aaaa ��3333333I 10 cog �� coil �� o00 �C�C�t, � � as aaaa'c�c� _ CCR-175 CP-SS B <so GWA-SS B <so AB-95 e �zz CCR-14S a sso 504 347 GWA-35 B 338 [CR-16S B 1no B so4 1398 a3.a AB -SOS a sa _ AB-6A B FILL \ 504 m5 18.9 138 504 16 m5 116 B CCR-11S 178 SDa ms 33.9 131 ms 109 5D4 ms 414 129 504 ms 125 zs6 m5 202 504 ms 19.4 1za soa ms 3aa 4 135 ALLUVIUMS cwA-zs ^ SAPROLITE CPrs 504 s3.8 SAPROLITE GWA-46 [[R-16D AB-70D B 1354 Tp5 278 CCR-140 500 CP-SD m5 373 B 2027 B 4% SO4 36&S _ CCR-1 D \ 504 147 709 / \ — _ ms zn ms lEa ms la7 120 WAD m5 178 47.9 302 \/ i 504 4� I - /I \ / \ /, GWA-SD CCR-11BY1 B 6A CCR-16BR / 04D —B 6s6 B 1390 _ soa 6a3 TRANSITION ZONE a 479 504 640 1 ' / \ / _ / - 504 37.6 SO4 814 TDS 1R1 - 504 37.6 450 \ \ B 1468 \ / AB-9D l TDS 1, \ / I / \ / I i i B 5 s1 \ / - GWA74 \ / \ / - _ \ 4 49.1 GWA3BRA / I B 38D \ / \ I / 1 \ / \ / 197 % 504 414 400 \/ \/ /I� \/� /\� /I/ \/ \� sLIL\/i �\ / I' So4 s6.7 /\ / I \� /- /\ / I/ \/� _ � \ / — _ \ / \ / BEDROCK' \ \ / — — \ ./,/ \/ I/1\/\/I/1lk/\I/1�/\/\/1 GWA-3BRA A \\.BEDROCK 149 a 350 / \ I ` /_- I \ / / \ I ♦ /_- I \ CP-6BR �y� \ / soa z61 / I \ / / �T T/_ I \ / / \ I \ / / \ I \ / — I \ B 4zD B 47 / /T TDS 1146 / / \ / 1 / / / / �� / 1 / 504 165 Lu W/`/I/\//\/I/\//\/I/\/�/\/I/\/�/\/I/\/'/\/I/\/ / \/71-1 /1/ \/\I/1�/\/\/1/ \/\I/1\/\ //�/ \ I/1\/\/\/1/ \/\I/1\/\/1/ \/\I/1\/\/1/ 300 \\ \ /\\//I / �\-c�\[�/I / \\ `\'/I \\ /\\ /I / \ //I / \\ /I / \\//\\\\ /I / \\� /`\'/I \\ /\\ 250 \/� \/I/\/�/\/I/\/� \/I�\/�/\/I/\/� GWA-sBRL /I/\/' \/I/ /�/\/I/\/� \/I/\/�/\/I/\/� \/I/\/�/\/I/\/7 0.1 \/I/ 200 \\ \ /\\//I / \\ /\\'i \\ \ /\�//I / \\��\\'/I \\ \ /\� /I / \\� / \\' I / \\/ /\\//I / \� /\\' I / \\/ /\\//I / \\� /\\' I / \\� /\IN \i\/1;' /il\/I/\li \/I/\/i \/I/\li \/I/ /il\/I/\li/il\/I/\li/il\/I/\li 150 /� \ \ / ////// 10 - 1'/\-- \— 1'/\— �\ - 1'/\-- \— 1'/\— �\ - 1'/\-- \— 1'/\— �\ - 1'/\-- \ 1'/\— �\ - 1'/\-- \— 1'/\— �\ _ 1' so /\— �\ - 1'/\-- \— 1'/\— �\ - 1'/\-- \ LEGEND ALL STE STATI n GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE V SHALLOW ZONE FLOW LAYER GROUNDWATER GWA 22D WELL IN TRANSITION ZONE WELL WATER LEVEL ELEVATION PLANT AL N RD. GWA-21BR WELL IN BEDROCK DEEP ZONE FLOW LAYER GROUNDWATER RETIRED ASH BASIN AB-35S WELL IN ASH PORE WATER WELL WATER LEVEL ELEVATION BEDROCK FLOW LAYER GROUNDWATER TORAG S(ASHTRUCSURALFELL) RETIRED CCR-11D ABANDONED WELL/ GEOTECHNICAL WELL WATER LEVEL ELEVATION ASH BASIN BORING ASH LANDFILL Z � GENERALIZED WATER TABLE WELL SCREEN CATAWBA 0 ALLUVIUM MEAN BORON (B) CONCENTRATION (IIg/L) �A (LAKRIVER E WYLIE) ® FILL P <� MEAN SULFATE (SO4) CONCENTRATION (mg/L) oPo �a MEAN TOTAL DISSOLVED SOLIDS (TDS) $ 0 SAPROLITE CONCENTRATION (mg/L) 0.MoNGP P ASH gIIN ® TRANSITION ZONE — — — COMPLIANCE BOUNDARY BEDROCK 0 PREDOMINANT BEDROCK CROSS SECTION A -A' IS LINEAR IN NATURE AND ALL FRACTURE ORIENTATION LOCATIONS NOT ALONG THE CROSS SECTION ARE PROJECTED ONTO THE CROSS SECTION. CROSS SECTION LOCATION SAPROLITE 450 400 CCR-18D- \ / _ 'BEDROCK \ I / 1 ` / \ / \ I / 1 ` -350 300 250 \ \/ \ / - _\/ / - \ \/ \ / - _\/ / 200 150 [100 NOTES 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, REFERENCED TO NORTH AMERICAN VERTICAL DATUM (NAVD) OF 1988. 2. GROUNDWATER FLOW IS APPROXIMATELY WEST TO EAST, PERPENDICULAR TO THE CROSS SECTION. 3. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT THE SITE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY. 4. ALL BOUNDARIES ARE APPROXIMATE. 5. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. t'DUKE ENERGY CAROLINAS 141P synTena GRAPHIC SCALE 0 112 225 450 HORIZONTAL SCALE: 1" = 450' VERTICAL SCALE: 1" = 90' 5X VERTICAL EXAGGERATION DRAWN BY: C. NEWELL DATE: 9/13/2019 REVISED BY: D. KREFSKI DATE: 3/5/2020 CHECKED BY: L. DRAGO DATE: 3/5/2020 APPROVED BY: L. DRAGO DATE: 3/5/2020 PROJECT MANAGER: C. SUTTELL LAYOUT: XSECT_AA(6-9A) www.synterracorp.com NOTES: 4 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS CALCULATED BASED ON CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019. 2. BORON (B) CONCENTRATIONS ARE IN MICROGRAMS PER LITER (Ng/L) 3. SULFATE (SO4) AND TOTAL DISSOLVED SOLIDS (TDS) CONCENTRATIONS ARE IN MILLIGRAMS PER LITER (mg/L) 3 -NO DATA AVAILABLE ANALYTICAL PARAMETER B SO4 TDS REPORTING UNITS Ug/L mg/L mg/L 15A NCAC 02L STANDARD 700 250 500 BACKGROUND THRESHOLD VALUE (SHALLOW FLOW ZONE)' 50 5 154 BACKGROUND THRESHOLD 50 15 173 VALUE (DEEP FLOW ZONE)' BACKGROUND THRESHOLD 50 7 221 VALUE (BEDROCK FLOW ZONE)' '-BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019. FIGURE 6-9a GENERAL CROSS SECTION A -A' CONSERVATIVE GROUP MEAN OF BORON, SULFATE AND TOTAL DISSOLVED SOLIDS (TDS) CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA 23 April 2020 A. (NORTH) LIVE COAL PILE _ I I I I I I 600 v U cai 1 cal cai [I P-35 I Z O 35 LU J W ' � J ' mmeo aQaQ U V GWhS Sr 44 I CCRUDA I Q Q — — _v — — — CCR-14S m SAPROLITE COMPLIANCE BOUNDARY fAOm m �� emo r� J �(37(39t37 UUU VC7 �aa�aa ch Chi GWA-35 s 96 CCR-16S m CCR-17S m AB-IOS Isr I CP-6D - I - I� CCR-16BR �LI CD-0D '` $� 261 CCR-17D sr 584 T / I CP-6DSr CP-3D \ s 1330 \ / I / 1 \ / \ I / \ / / \ I / 1 / / - GwA-sD Gwa m TRANSITION ZONE 456 CCR-14D 243 J' \ \�� \ i � I \ i \ I \ GWA-sBRA I \ i \ i \ I \ I \ i ♦ I - _ I ♦ / — I ♦ �� I zzD - I ♦ / — GwA-3D I ♦ / — \ 133 GWA-3BRA \/i \/I�\/il\/I�\lam \�I-L\/il\/I \li \/I�\/il\/I�\li �l\/li\li ♦/I/v /. /I/\/ - \ ' \ /I \ / \ - \ �I ' /I / \ / - \ �I ' \ I N ' ♦ / ` \"` /I \ / \ _ \ �I / \ BEDROCK'\ / \ _ s /I \ / \ - \ �I N ' /I N \- \ \BEDROC\ 0 sr 1 s65 \ /I - / \/ \ \ /I� \\ /I / \/ \ \ \ I/1♦' /\I "\ I/1`/-/\I "\ I/,oi`/� I `/\ I/1" /\I "\ I/1" /\I "\ I/1♦/- I `/\ I/1" /\I `/\ I/1` \ I / 1 ` / \I " \ I / 1 ` /-/ \I " \ I / 1 ` /-/ I ` / \ \I / 1 ` /-/ \I ♦ / \ \I / 1 ` /-/ \I ` / \ \I / 1 ` /- I \ / \ \I / 1 ` ' / \I " \ I / 1 ` . s zoz /1♦/\/\/\, \/\I/1"\/\/1, \/\I/1♦'\/\/1/ \ \I/1\/\/\/1, >/1, \/\ /\, \/\I/1" \/\ /IL \�/\I/1"\/\ /\/ \/ I/1`/_\/\ /\, \/\I/1"\/\ /1, \/\I/1" \/\ /\/ \ \I/1♦/\/\ /1, \/\I/1" \/\ /1,. //` -\ V//\I/1�'\/\I/1" \/\I/1��\/♦�/1♦ /\/\I/1��\/ I/1" \/\I/1�' \/\I/1"\/\I/1��\/\I/1" \/\I/1��\ \I/1"\/\I/1��\/\I/1" \/\I/1�. AT- \ I\I/1��\/� /1,�\/\I/1��\/� /1,�\/\I LEGEND NOTES STATION GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE V SHALLOW ZONE FLOW LAYER GROUNDWATER D GWA 22D WELL IN TRANSITION ZONE WELL WATER LEVEL ELEVATION PLANT AL N RD. GWA-21BR WELL IN BEDROCK y DEEP ZONE FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION RETIRED AB-35S WELL IN ASH PORE WATER ASH BASIN (ASH STORAGE/ CCR-11D ABANDONED WELL/ GEOTECHNICAL _y BEDROCK FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION STRUCTURAL FILL) RETIRED BORING ASH LANDFIL GENERALIZED WATER TABLE WELL SCREEN 0 ALLUVIUM row MEAN STRONTIUM (Sr) CONCENTRATION (IJg/L) CATAWBA FILL �— N (LAKEVER WYLIE) — — COMPLIANCE BOUNDARY = SAPROLITE j�ONGA0P0 PRMS ® TRANSITION ZONE ACTIVE pASH BASIN BEDROCK D o PREDOMINANT BEDROCK NOTE: D — — — FRACTURE ORIENTATION CROSS SECTION A -A' IS LINEAR IN NATURE AND ALL LOCATIONS NOT ALONG THE CROSS SECTION ARE PROJECTED ONTO THE CROSS SECTION. CROSS SECTION LOCATION I cm-Im I SAPROLITE _ A' (SOUTH) I GWA-2D I 1 450 I• -400 Z O 'BEDROCK Lu Lu 300 250 200 150 -100 NOTES: 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS CALCULATED BASED ON CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019. 2. STRONTIUM (Sr) CONCENTRATIONS ARE IN MICROGRAMS PER LITER (pg/L) 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, REFERENCED TO NORTH AMERICAN VERTICAL DATUM (NAVD) OF 1988. 2. GROUNDWATER FLOW IS APPROXIMATELY WEST TO EAST, PERPENDICULAR TO THE CROSS SECTION. 3. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT THE STE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY. 4. ALL BOUNDARIES ARE APPROXIMATE. 5. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. GRAPHIC SCALE 0 112 225 450 It DUKE ENERGY HORIZONTAL SCALE: 1"0 450' VERTICAL SCALE: 1" = 9' 5X VERTICAL EXAGGERATION CAROLINAS DRAWN BY: C. NEWELL DATE:9/13/2019 REVISED BY: D. KREFSKI DATE: 3/5/2020 CHECKED BY: L. DRAGO DATE: 3/5/2020 APPROVED BY: L. DRAGO DATE: 3/5/2020 PROJECT MANAGER: C. SUTTELL LAYOUT: XSECT_y (6-9B) www.synterracorp.com synTerra 3. -NO DATA AVAILABLE ANALYTICAL PARAMETER Sr REPORTING UNITS pg/L 15A NCAC 02L STANDARD NE BACKGROUND THRESHOLD VALUE (SHALLOW FLOW ZONQ) 300 BACKGROUND THRESHOLD 240 VALUE (DEEP FLOW ZONE)i BACKGROUND THRESHOLD 181 VALUE (BEDROCK FLOW ZONE)' '- BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019. FIGURE 6-9b GENERAL CROSS SECTION A -A' NON -CONSERVATIVE GROUP MEAN OF STRONTIUM CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA 23 April 2020 Lu J W (NORTH) LIVE COAL (SOUTH) PILE COMPLIANCE BOUNDARY ter, I_I 5 /I— \/\/1, NOTE: CROSS SECTION A -A' IS LINEAR IN NATURE AND ALL LOCATIONS NOT ALONG THE CROSS SECTION ARE PROJECTED ONTO THE CROSS SECTION. CROSS SECTION LOCATION LEGEND GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE GWA 22D WELL IN TRANSITION ZONE GWA-21BR WELL IN BEDROCK AB-35S WELL IN ASH PORE WATER CCR-11D ABANDONED WELL/ GEOTECHNICAL BORING GENERALIZED WATER TABLE ALLUVIUM ® FILL 0 SAPROLITE ® TRANSITION ZONE BEDROCK PREDOMINANT BEDROCK FRACTURE ORIENTATION / IMn I 38 co Qz Fe / \\/ I / \ / / \�\I�\v / \\/ I . O _ } / BEDROCK I / 1 / I / 1 ` / \ / \ I / 1 —350 Q Lu Lu 300 /i l \ /i l l \\/ I \ l / l \\/ I 250 150 �\/\II[100 '/ /I \/ i NOTES: 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS CALCULATED BASED ON CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019. 2. COBALT (Co), IRON (Fe), AND MANGANESE (Mn) CONCENTRATIONS ARE IN MICROGRAMS PER LITER (pg/L) 3. -NO DATA AVAILABLE ANALYTICAL PARAMETER Co Fe M. NOTESREPORTING UNITS Ng/L Ng/L Ng/L SHALLOW ZONE FLOW LAYER GROUNDWATER 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, REFERENCED TO NORTH 15A NCAC 02L STANDARD 1' 300 So BACKGROUND THRESHOLD AMERICAN VERTICAL DATUM (NAVD) OF 1988. VALUE (SHALLOW FLOW ZONE)' 6 1,422 608 WELL WATER LEVEL ELEVATION 2. GROUNDWATER FLOW IS APPROXIMATELY WEST TO EAST, PERPENDICULAR TO THE CROSS V DEEP ZONE FLOW LAYER GROUNDWATER SECTION. 3. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE BACKGROUND THRESHOLD VALUE (DEEP FLOW ZONE)' 0.8 665 256 WELL WATER LEVEL ELEVATION ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS BACKGROUND THRESHOLD CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY VALUE (BEDROCK FLOW ZONE)' 0.3 1,242 360 V BEDROCK FLOW LAYER GROUNDWATER DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT THE _ - INTERIM MAXIMUM ALLOWABLE CONCENTRATIONS (IMACs) OFTHE WELL WATER LEVEL ELEVATION SITE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. 15A NCAC 02L STANDARD APPENDIX 1, AP RIL I, 2013. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY. ' - BACKGROUND THRESHOLD VALUES WERE CALCULATED USING WELL SCREEN 4. ALL BOUNDARIES ARE APPROXIMATE. DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED 5. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019. MEAN COBALT (Co) CONCENTRATION (pg/L) GRAPHIC SCALE e.l MEAN IRON (Fe) CONCENTRATION (pg/L) MEAN MANGANESE (Mn) CONCENTRATION (pg/L) DUKE 0 112 225 450 FIGURE 6-9c — — — COMPLIANCE BOUNDARY 40) ENERGY VERTICAL VERTICAL SCALE: 1" = 90' GENERAL CROSS SECTION A -A' 5X VERTICAL EXAGGERATION VARIABLE GROUP CAROLINAS DRAWN BY: C.NEWELL DATE:9/13/2019 MEAN OF COBALT, IRON AND MANGANESE REVISED BY: D. KREFSKI DATE: 3/5/2020 CHECKED BY: L.DRAGO DATE:3/5/2020 CORRECTIVE ACTION PLAN UPDATE 1147 APPROVED BY: L. DRAGO DATE:3/5/2020 gLLEN STEAM STATION PROJECT MANAGER: C.SUTTELL LAYOUT: XSECT_AA(6-9C) BELMONT, NORTH CAROLINA synTerra www.synterracorp.com Rev. 1 23 April 2020 (WEST) I - COMPLIANCE BOUNDARY J EAST STRUCTURAL STRUCTURAL I (EAST) FILL FILL Q ASH STORAGE BEND IN COAL PILE —, �y, CROSS SECTION 700 N =z (7 C7 700 I I I I I J I I N N N �U U j fnUlOm I� (L o aQ Q9� 650 a a s ____ _ ____ ____ _ m Inm a s C� C� 3 3 650 ---------------------- ____ ____ ____ ____ -_ ==___ _ _ ____ _______'_====-I -----__________ ____ ____ ====j-=-==___---- ---_---- ----_ �__ �__= __ _______________ -----__--_- - - - - (n G m (n C m CATAWBA — — — - - --=�=-=�=-=�=-==-= _____�_-_�_ __�____ oo ao 00 0� o� o� RIVER _=======_=___ __ __ ____________-=_=___=' C to G U) CCR-BG-075_--_--_-______- ASH PORE r_-_}-________ _-_-_-_-_-___ -_____ __ __-_--__ AB-44AP ___-_`-_- ---- B 6 WATER ==1= _ ---- _-_====ii'- Q Q Q Q Q Q 600 — — - — 504 12 AB 3855 '_'_'_ _ _ _ AB-395 _____ _ _ _ __ __ -_ _=_=_ = 8 T� B c50 AB-3B5 B 119 ==50a - - GwA-ohs 600 soa z9 s 118 - ms a zsl C9 C9 t9 t9 C9 C9 a a (LAKE soa is C) U �� WYLIE) SAPROLITE D5 120 s6.' SAPROLITE Tos zus — (APPROX.) soa 1 0 I — ( _ _ AB-38D AB-39D A&� CCR-095A GWA-305 CP-O35 CP-02S GWA-ffiS ` ) TDS 137 6 50 B 1190 6 296 B 361 B 50 g <50 B <r�0 550 504 1G6 B 504 370 50q 1330 SO4 98D 504 342 504 1746 s04 110 -- -550 TRANSITION ZONE 5p4 390 TOs s63 TDS 1746 TRANSITION ZONE Tu 199 _ TDs zn ms sn I Tos 1913 Tos zsa TDS 1520 Op-oas _ 1 /\-- \ / / / GwA-06oA SAPROLITE y B <sD BG02D / \ / 1 / \/ / \ 1 _ \/ / \ / I / \ / / \ I _ \/ / \ / CCR-BGOIDA / / \ / 1 / \ / / \ AB-38BR � I / \/ / \ 1 _ \/ / \ / I / \ / / \ �� \/ � GW�� 504 978 Z B <50 I \ / - \ \ / - _ \ I / \ / _ B 6 - - \ I \ B 50 _ \ / _ _ \ \ B 29 - O /\I \ //\1 \ / /\1 /\I \ / \/\ / < \ /\/\I/ I\ / /\1 \ / \/\I/ 1 AB-44D I 504 3a1 CP-02D /\B 50 TOs 1434 / / 504 1 504 15.2 / / 5B 2152 \ / 1 \ / 1 \ soa 11 \ �/ _ /; - 1'/ - \ - \'/ - /\ - \'/ - \ - \'/ - \ - 1'/ - /\ - 1'/ - /� - \'/ - \ - \'/ - /\ - 1'/ - \ \'/ - e 3si TDS s- \ - 1' 190 _ / \ \ \/ / - / \ ; \/ / - / TD ua - / \ \ ./ Tns 191 \ \ \/ / - / \ \ \/ / - / I�y / isa Q 500 TDS ue \\/ 1 / \ / \\/ /\\/\/ / /\\�I / /\/ soa is y CP-mD \ TM - / 500 A�� \ / \I \ /_— \ 1 \ /\ \1 \ /— I \ \I \ /— _ / ♦ \ /— I \ \I \ /— \ \I \ /— I \ / 51 B % W / \ /\ \/\ /1 \ / 1 /\ \ /1, \/♦I/1`/ \ 1/1, cwa 30D �a 6y�I LP-mD 5• '1 / Li_ / ./\/\/.AB-asss/B zm - \ lma.//BW I- / / / / \ / I / \ / / / / \ / 1 / \ / / / \ / I / \ / / / / / \ / I / \ / / // / \ / / \ / / / / \ / I / \ / / / / / / / / / / / \ / I \r\T'B14a14so I\_s0a z2DD ,_I\/ cWA-z9D 7� 929 � \/\ mil/1 /\ \\/\/1 /\ \/�� \/`\ Tos za9 \ \/I 1\/ /\- \'- 1'/ - \ - \' - 1'/ - - \' - \' - \' \�1--i .a? / - - \' C- \- / - \' / - - 1-, --ros 36ao -�/ - �(\ B <50 450 \ / - Y \ X- / - - 1 \ / \ \ / A-zsBR 50421 6so AB-41D CCR-OSDA GWA-06BRA TDS 1170 / \I \ /_— I \ / �f1 /- I \ / / \I \ /_- I \ / / \I \ /_- I ♦ / / \1 / \ I / I \ / \ / \ / 1 ` / D \ / \I / I \ / / \I B 9D B B <50 \ / / \I \ /_— I _ i — I \ . fA GWA-29BR 1 504 1504 17D 504 \� \ / \ /I - \l i /1 \l i /\ /\ /- /i /\ /\ /- /i /\ /\/ /- /i /\ /\/ /- /i /\ /\/ /- /i /TOs \ /- 05/\ /\/ \/ /-/ /1 \l sB <50 I I/ I I I/ 1 / 1100 /I - 400 %I/I/1\/\/\II/1\ / \/\II/1\ /\/\II/1\/ \/\II/1\ /\/\II/1\ / \/\II/\\/\/\I/I/�•, \/\I 1// \/\I/1\/\/\II/1\/ \/\Ii\ 7�5 _1SZa Ij 400 /'\' 350 350 200 /NOTES: /\1 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR 150 _GEOMEANS CALCULATED BASED ON CENTRAL TENDENCY OF DATASET I USING DATA RANGING FROM JANUARY 2018 TO TUNE 2019. _ \ \ / - _ ♦ . / - \ \ / \ / - _ \ / - \ \ / \ / - _ \ / - \ \ / \ / - _ \ / - \ \ / \ / - _ \ / - \ \ / \ / - _ ♦ / - \ \ / \ / - _ ♦ / - \ \ / \ / - _ \ / - \ \ / \ / - _ \ / - \ \ / \ 2. BORON (B) CONCENTRATIONS ARE IN MICROGRAMS PER LITER _ (Pg/L) \'/\-3. SULFATE(504) AND TOTALDISSOLVED SOLIDS (TDS) CONCENTRATIONS ARE IN MILLIGRAMS PER LITER (mg/L) 100 LEGEND NOTES 4. MOST RECENT SAMPLE USED FOR AB-41SS/D, AB-04AP/SS/D, GWA- 28S/D/BR, GWA-29S/D/BR, AND GWA-30S/D. CANALROAD ASH PORE WATER FLOW LAYER ALLE .g, GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE � 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, AND OCTOBER 24, 2019 5. -NO DATA AVAILABLE STEAM STATION GWA-22D WELL IN TRANSITION ZONE WATER LEVEL ELEVATION (AB-41SS, AB-41D, AB-44AP, AB-44SS, AB-44D, GWA-28S, GWA-28D, GWA-28BR, GWA-29S, GWA-29D, ANALYTICAL PARAMETER B SO4 TDS SHALLOW ZONE FLOW LAYER GROUNDWATER GWA-29BR, GWA-30S, GWA-30D) REFERENCED TO NORTH AMERICAN VERTICAL DATUM (NAVD) OF 1988. REPORTING UNITS Pg/L mg/L mg/L B GWA-216R WELL IN BEDROCK PLANTAL N RD. WELL WATER LEVEL ELEVATION 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE 15A NCAC 02L STANDARD 700 250 500 AB-35S WELL IN ASH PORE WATER DEEP ZONE FLOW LAYER GROUNDWATER ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS CONCEPTUALLY BACKGROUND THRESHOLD VALUE (SHALLOW FLOW ZONE)` 50 5 154 WELL WATER LEVEL ELEVATION ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY DISTINCT, CONSISTENT BACKGROUND THRESHOLD RETIRED GENERALIZED WATER TABLE FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT THE SITE. THE ACTUAL NUMBER S0 15 173 ASH BASIN GENERALIZED GROUNDWATER BEDROCK FLOW LAYER GROUNDWATER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTH AND VALUE (DEEP FLOW ZONE)' LENGTH OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY. BACKGROUND THRESHOLD (ASH STORAGE/ FLOW DIRECTION STRUCTURAL FILL) RETIRED WELL WATER LEVEL ELEVATION VALUE (BEDROCK FLOW ZONE)' 50 7 221 eGavD MEAN BORON B CONCENTRATION rt/ L 3. ALL BOUNDARIES ARE APPROXIMATE. , _ GENERALIZED ASH PORE WATER ( ) (US' ) BACKGROUND THRESHOLD VALUES WERE CALCULATED USING ASH LANDFILL �� FLOW DIRECTION a 5° MEAN SULFATE (SO4) CONCENTRATION (mg/L) DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED �� sot 116 MEAN TOTAL DISSOLVED SOLIDS (TDS) 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019. 0 ASH Tos 16 cnrnwBA CONCENTRATION (mg/L) RIVER m (LAKE WYLIE) ASH PORE WATER GP� 5 SAPROLITE GRAPHIC SCALE WELL SCREEN$ DUKE 0 100 200 400' FIGURE 6-10a HORIZONTAL SCALE:V=400' GENERAL CROSS SECTION B-B' tnENERGY BIAS ® TRANSITION ZONE �/� BREAKLINE VERTICAL SCALE: 1"=80' CONSERVATIVE GROUP BEDROCK - — - COMPLIANCE BOUNDARY SX VERTICAL EXAGGERATION CAROLINAS MEAN OF BORON, SULFATE AND TOTAL o DRAWN BY: J. CHASTAIN DATE:7/26/2019 SURFACE WATER REVISED BY: D. KREFSKI DATE:3/5/2020 DISSOLVED SOLIDS (TDS) NOiE: CROSS SECTION B-B'IS LINEAR IN NATURE AND ALL _ _ _ PREDOMINANT BEDROCK LOCATIONS NOT ALONG THE CROSS SECTION ARE FRACTURE ORIENTATION CHECKED BY: L.DRAGO DATE:3/5/2020 141P APPROVED BY: L. DRAGO DATE: 3/5/2020 CORRECTIVE ACTION PLAN UPDATE PROJECT MANAGER: C. SUTTELL PROJECTED ONTO THE CROSS SECTION. LAYOUT ALLEN STEAM STATION 1nte CROSS SECTION LOCATION synTero y p BELMONT, NORTH CAROLINA XSEEC/ S YYa COY .COYYI Rev. 1 23 April 2020 B- (WEST) ASH STORAGE n n COMPLIANCE BOUNDARY STRUCTURAL STRUCTURAL FILL FILL BEND IN CROSS SECTION I - B' (EAST) 200 /:-I,NOTES• -\�/`� ��-\�/♦-'\-\�/`�'�-1�/.-'\-\%/`�'�-1�/.-'\-\�/`�'�-\�/♦-'\-\%/`�'�-1�/.-'\-\%/`�'�-1�/.-'\-\�/`�'�-\�/.-'\-1�/`,'�-1�/.-'\ -\%/ �'�-\�/.-'\�\�/`/ - ` /I / ♦ / - ` / - ` /I / ♦ / - ` / - ` �I / ♦ / - ` / - ` /I / ♦ / - ` / - ` �I / ♦ / - ` / - ` �I / ♦ / - ` / - ` /I / ♦ / - ` ` / - ` �I / ♦ / - ` / - ` /I / ♦ / - ` / - ` �I ♦ / - ` 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR 150 \/ ��/� \ -\'/ -\ \-1�/`-/ \ -1'/ -\ \� 1�/`-/ \ -\'/ -\ \-\�/`-/ \ -\'/ -\ \� 1'/`-/ \ -\'/ -\ \-\�/`-/ \ -1'/ -\ \� \�/`-/ GEOMEANS CALCULATED BASED ON CENTRAL TENDENCY OF DATASET \ -\'/ -\ \ -\�/` \ -\'/ -\ \� 1'/ -/ \ -\'/ -\ \ 1�/`-/ \ -1 USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019. / �. / I / \ i l . �. / I / \ i l �. / I / \ i l �. / I / \ i l . �. / I / \ i l �. / I / \ i l �♦ / / I / \ i l �. / I / \ i l �♦ / I / \ i l �. / I / \ i \`. ♦�� I \`i ♦�� (. \`i �� (. \`i ♦�� I \`� ♦�� (. \`i ♦�� (. \`i ♦�� (. \`i ♦�/ (. \`i �� (. \`i _ ♦ � / - ♦ � i � , - _ ♦ � / - ♦ � i � / - _ ♦ � / - ♦ � i � , - _ ♦ � / - ♦ � i � / - _ \ � / - ♦ � i � / - _ ♦ � / - ♦ � i � , - _ \ � / - ♦ � i � / - _ \ � / - ♦ � i � / - _ \ / - ♦ � i � , - _ ♦ � / - ♦ � 2. STRONTIUM (Sr) CONCENTRATIONS ARE IN MICROGRAMS PER 1 / \ / \' / 1 ` / \ / \' / 1 \ / \' / 1 ` / \ / \' / 1 \ / \' / 1 ` / \ / \' / 1 \ / \' / 1 ` / \ / \' / 1 \ / \' / 1 ` / \ / \' / 1 \ / \' / 1 ` / \ / \' / 1 \ / \' / 1 ` / \ / \' / 1 \ / \' / 1 ` / \ / \' 1 / \ / \' / 1 ` / \ / \' / 1 \ / LITER (Ng/L) �3. MOST RECENT SAMPLE USED FOR AB-41S5/D, AB-44AP/SS/D, GWA- `� ♦ /I \/ i`� /I \/ \ /I \/ i`� /I 1/ ♦ /I \/ i`� /I 1/ ♦ /I \/ i`� /I 1/ ♦ /I \/ i`� /I \/ ♦ /I \/ i`� /I 1/ \ /I \/ i`� /I 1/ ♦ /I \/ i`� /I \/ \ /I \/ i`� /I `l ♦ /I \/ 285/D/BR, GWA-295/D/BR, AND GWA-30S/D. xt '4. CANAL ROAD LEGEND -NO DATA AVAILABLE NOTES ANALYTICAL PARAMETER Sr B� ST GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE ASH PORE LAYER 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, AND OCTOBER 24, 2019 REPORTING UNITS Ng/L STAT WATER LEVEL ELEVATION GWA-22D WELL IN TRANSITION ZONE (AB-41SS, AB-41D, AB-44AP, AB-44SS, AB-44D, GWA-28S, GWA-28D, GWA-28BR, GWA-29S, GWA-29D, 15A NCAC 02L STANDARD NE GWA-29BR, GWA-30S, GWA-30D) REFERENCED TO NORTH AMERICAN VERTICAL DATUM (NAVD) OF 1988. B PLAN N RD. GWA-21BR WELL IN BEDROCK SHALLOW ZONE FLOW LAYER GROUNDWATER BACKGROUND THRESHOLD 2 FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE VALUE (SHALLOW FLOW ZONE)' 300 AB-35S WELL IN ASH PORE WATER WELL WATER LEVEL ELEVATION ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS CONCEPTUALLY BACKGROUND THRESHOLD DEEP ZONE FLOW LAYER GROUNDWATER ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY DISTINCT, CONSISTENT FRACTURE SETS, BUT WIDE VARIETY of FRACTURE ORIENTATIONS AT THE SITE. THE ACTUAL NUMBER VALUE (DEEP FLOW ZONE)' 240 GENERALIZED WATER TABLE ASH BASIN WELL WATER LEVEL ELEVATION OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTH AND BACKGROUND THRESHOLD (ASH STORAGE/ GENERALIZED GROUNDWATER BEDROCK FLOW LAYER GROUNDWATER LENGTH OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY. VALUE (BEDROCK FLOW ZONE)' 181 STRUCTURAL FILL)RETIRED FLOW DIRECTION WELL WATER LEVEL ELEVATION ASHBASIN ASH LANDFILL GENERALIZED ASH PORE WATER 3. ALL BOUNDARIES ARE APPROXIMATE. r _ BACKGROUND THRESHOLD VALUES WERE CALCULATED USING -� FLOW DIRECTION s,a�x a, MEAN STRONTIUM (Sr) CONCENTRATION (ug/L) 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019. Y CATAWBA ASH '\ RIVER o (LAKE WYLIE) 0 ASH PORE WATER WELL SCREEN 0 SAPROLITE 0 GRAPHIC 100002000CALE 400' DUKE FIGURE 6-10b � P�Msca°N o- �,� BREAKLINE ACTIVE ASH BASIN ® TRANSITION ZONE ' HORIZONTAL SCALE: 1"=400' VERTICAL SCALE: 1" = 80' ENERGY GENERAL CROSS SECTION B-B' - _ - COMPLIANCE BOUNDARY SXVERTICALEXAGGEPATION NON -CONSERVATIVE GROUP o BEDROCK CAROLINAS DRAWN BY: J. CHASTAIN DATE:7/26/2019 MEAN OF STRONTIUM SURFACE WATER REVISED BY: D. KREFSKI DATE: 3/5/2020 NOTE: CHECKED BY: L. DRAGO DATE: 3/5/2020 CORRECTIVE ACTION PLAN UPDATE CROSS SECTION B-B' IS LINEAR IN NATURE AND ALL - _ _ PREDOMINANT BEDROCK LOCATIONS NOTALONG THE CROSS SECTION ARE FRACTURE ORIENTATION APPROVED BY: L. DRAGO DATE: 3/5/2020 , PROJECT MANAGER: C. SUTTELL ALLEN STEAM STATION PROJECTED ONTO THE CROSS SECTION. LAYOUT: xsecT6-1o6 BELMONT, NORTH CAROLINA CROSS SECTION LOCATION synTena www.synterracorp.com Rev. 1 23 April 2020 700 650 600 550 v Z O Q 500 W J W 450 400 350 150 100 B - (WEST) I - COMPLIANCE BOUNDARY STRUCTURAL STRUCTURAL FILL FILL ASH STORAGE BEND IN p, I C fn CROSS SECTION QJ �0N I�� rno 0, =_ a`) me Qa m m m U U M coM M M �? M 1 Q a Y mmmm �� mm��aaaa a�aaa ____�___=�---- - �a ---- ---- ---- ---____-_--_----_------____________ _____ -- _ ------------------ _- — — — — — ___ _— — _=w======--=-=-=-=-=--=====_= _______ -------- ASH -------------- PORE _ - - 0 ---------- WATER - - #F=-= __-_ _______ _= ____ _=_= -_= Q _ AB-38S �� _ AB-395 =- ---- ---- -------____� _ BG-025 Mn - Fe 356 Co 13 Co L9 = --- --- --- —==-Mn - �- SAPROLITE Mn 16/ Mo iissz SAPROLITE M� I ccR o4sA Fe 193 AB-38D AB-44S5 Co 210D � - B' (EAST) I COAL PILE I -I I 700 I , I , I , I , I , I , I , m o 650 M M I I CATAW BA Q Q M G m N G m ao ao w rn w rn RIVER G to dd as M M 600 ------ C9C9C9 C9C9C7UU (LAKE -V EL. 565 cP-a1s cP Co 514 Co 10.4 GWA-ffis (APPROX.) Fe 32733 Fe 3243 Ca 224 TRANSITION ZONE 1 1J1 ��-I I I I I I I I I I I I I I �_J_4 1I Mn sLai Mn z960 Fe 386 550 �� Mn — AB�39D Mn 4800 I A&4155 282 CP-02D Mn 4800 CP-03S 1 �"`7 ` ---�r2 % _ \ — 1 , ♦ ��(' r�� Co SO50 W �y Co 49.4 eG azD / // / / Co 01 Mn z370o SAPROLITE Fe Gwer z9s \ / I / \l\/ i l \ / I / \ l \ / I / \/ i l \ - CCR-BG-OIDA \/ i l / I / \ l \ Al- BR 1 1 / \/ \ / I / \/ i / \ / I Fe 393 Fe 10G1 / � / ♦ � _ \ I ♦ / ♦ / — \ / � / � _ \ I ` / 58 Co 9.1 Mn 3090 AB-44D Mn 393000 — GWA-30D Mn 1673 Fe 400 Mn 74 \ / Ca 0.3' — \ — Mn 2210 50U Fe 1 - \ BG-02BRA-2 I \ / I \ / - I ♦ / I \ / - I ♦ / I ♦ / - I ♦ / I \ / - I \ / I \ / - ♦ / I \ / - I 1 / I ♦ / I _ / cP-03D /�.�� \ /♦-_ \ - )% / �``/ - 1 /♦-- \ \ •/ - - \ /♦- 1 .� -) \ /♦-_ \ - 1 `/ / - w os) ccR-o4oA/♦-_ 1 /.� - n 3z7o co 8 \i �T.L/ 1/ \/� I_\/i \ / I/Jlr� I_\/Y \ /�e�� I-\/i \ / 1/ \/� I_\/i \ / I/i i�-\/i \ /jai I \/� / / 1/ \/ \ / \ GWAr29D Fe 3I90 Mn S \/ 1� _ \ ♦ / —\/ / _\ / _ / / ♦ / —e-/y/ — _\ / _\/ / \ �/ \/ / — ♦ / — ./ Fe 4n _ Co 0.3 Co Tl' / _ _ \ i — _ \/ Mn 3223 \ / \ / \ / I �. I \ / I \ / I \ / \ \ / f//�LLI \/\ /1 �^/j1 /1/ \/\ /1 \\/\ /1 'Ci \I/\\/ \/\ %i�� /� Mn 472 Fe \ Fe 93fi Co 0.1 �L GWA-28BR / \ — \' \ — \' \ — \' \ 1 �1 \ — \'/ — C— \'/ — \ — 1' \ - 1 ✓ - 1 Mn ^ Mn 761 - \ / — \ i _ i /� \\ i /1 \ / ` I / \\ /I \ _ /I / \\ i �\ I \_ ♦ /I / \\ i /1 \ _ /1 / \\ i /I \_ %; f/I \\' / \ / I / \\_ /I / \\� /\ / 1 -� / //I / \\' / \ /j �\ / 1 / \\�.1� /I / \\'Fe 53 Mn 610 M �j�\/\I/1♦/\/\I/1/\/\I/1`/\/\I/1/\/\I/1♦/\/\I/1/�\/\I/1\/\/\I�/1/�\ O(� ii(\/\I/1//\/\I/\♦/\ \I/1/�\/\ CO A06B37 /\/\I/1♦/\Y\I/1♦/ /\ Mn ♦/—♦ GWA-29BR \ 9 _ 1 — \ � /♦-- \ � \ ' /♦-- \ — \ � /\—_ \ � \ ' /\-- \ — 1 � /♦—_ \ � \ ' /♦-- \ — \ � /♦—_ \ � 1 ' /♦-- \ — \ � /♦—_ \ � \ ' /♦-- \ — 1 � /♦—_ \ � \ ' /♦-- \ — 1 � /♦—_ \ � \ ' /\-- \ \ � /♦-- \ � \ � Fe 253 - \ � \ ' /♦-- \ — 1 / /`-- \ � \ ' /♦' _� \ _ 1 � /♦-- \ � \ ' /♦-- \ Fe 1000 �Z/\I/1;/\/\I/1♦/\/\I/1;/\/\I/1`/\/\I/1;/\%\I/1`/\/\I/1;/\%\I/1`/\/\I/1;/\%\I/1`/\/\I/1;/\%\I/1\/\/\I/1;/\%\I/\\/\/\I/1;/\/\/1 \, .' 1;/\%\I/1♦/\%\I/1;/\/\I/1\/\/\I/1;/\/\I/1♦/\/ ,,/ 400 _ \\ � /\♦ /I / \ \ /\�//I � \\ � /\♦ /1 / \\ � /\�//1 � \` � �/\111 / \\ � /\.//I �� / \\ � /\�//I � \\�/w//I / \\ � /\. /I � \` � /\\/� \\ � /\� /I � \\ � /\♦� / \\ � /\�//I � \\ � /\�//I / \\ � /\. /I � \\ � /\ //I / \\ � /\�//I � �\�\ /�/`/ \\ � /\♦//I � \\ � /\�/ I / \\ � /\� /I � \\ � /\�//I / /1�//\I/1\/\/'`'/1�//\I/1\/\/\I/1�//\I/1\/\/\I/1�//\I/1♦/\/\�1�//\I/1\/\/�il�/�/\I/\\/\/\I/1\/ /\I ♦/\/\I 1\/ /\I \/- I \/_- ♦/ I �/\ I/1\/\ I/1♦. /I/\/i/\/I/ -350 `\/\I/1♦/\/\I/1`/\/\I/1\/\/\I/1`/\/\I/1\/\/\I/1\/\/\I/1♦/\/\I/1`/\/\I/1\/\/\I/1♦/\/\I/1\/\/\I/1\/\/\I/1\/\/\I/1♦/\/\I/1\/\/\I, Fe 401 1//\/\I/1`/\/\I/1\/\/\I/1♦/\/\I/1♦/\/\I/1\/\/\I/1♦. \\/\I/1�/\/\I/1`/\/\I/1�/\/\I/1♦/\/\I/\�/\/\I/1`/\/\I/1�/\/\I/1`/\/\I/1�/\/\I/1`/\/\I/\//\/\I/1`/\/\I/1�/\/\I/1\/\/\I/1�/\/\I/1\/\/\I 1�/\/\I/1\/\/\I/1��\/\I/1\/\/\I/1/�\/\I/1\/\/\I/1�' I NOTES: 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS CALCULATED BASED ON CENTRAL TENDENCY OF DATASET 1 \'/`—/ \ — 1'/ —\ \ \'/♦—/ \ — \'/ —\ \ / \'/`—/ \ — \'/ —\ \ 1'/♦—/ \ — \'/ —\ \ / \'/\—/ \ \'/ —\ \ \//♦—/ \ — \'/ —\ \ / \'/`—/ \ \'/ —\ \ \'/♦—/ \ — \'/ —\ \ / \'/ —/ \ \'/ —\ \ \//♦—/ \ — \'/ —\ \ .USING DATA RANGING FROMJANUARY 2018 TO JUNE 2019. 1 _ \ / — \ \ / / — _ \ / — \ \ / / — _ \ / — \ \ / / — _ \ / — \ \ / / — _ \ / — \ \ / / — _ \ / — \ \ / / — _ \ ♦ / — \ \ / / — _ \ / — \ \ / / — _ \ / — \ \ / / — _ \ / — \ \ / / — 2. COBALT (Co), IRON (Fe), AND MANGANESE (Mn) CONCENTRATIONS /_\/\I/1//\/\I/1\/\/\I/1/�\/\I/1\ / \/\I/\/�\/\I/1♦ /\/\I/1/�\/\I/1\/\/\I/1/�\/\I/1\/\/\I/\/�\/\I/1\/ \/\I/\/�\/\I/\\ /\/\I/1/�\/\I/1\/ \/\I 1//\/\I/1♦ /\/\I/\/�\/\I/1\/_ ARE IN MICROGRAMS PER LITER(pg/L) 3. MOST RECENT SAMPLE USED FOR AB-4155/D, AB-44AP/SS/D, G WA- 1 _ \ / � / — \ / � / — _ \ / � / — \ / � / — _ \ / ♦ / — \ / � / — _ \ / � / — \ / � / — _ \ / ♦ / — \ / � / — _ \ / � / — \ / ♦ / — _ \ / ♦ / — \ / � / — _ \ / � / — \ / � / — _ \ / ♦ / — \ / � / — _ \ / � / — \ / � / — 285/D/B R, GWA-295/D/BR, AND GWA-305/D. /\/\I/1\/�/�I \/\/\I/\\/ /�I♦/\/\I/1♦//�I,`/\/\I/1\//\I,`/\/\I/1\//�I,`/\/\I/1♦//�I.,`/\/\I/1\//�I,`/\/\I/1\//�I,\/\/\I/1♦/./.I..\/\/\I/1\/�/�I 4.-NO DATA AVAILABLE LEGENDNOTES ANALYTICAL PARAMETER Co Fe Mn CANAL ROAD REPORTING UNITS ALLEN B 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, AND OCTOBER 24, 2019 (AB-41SS, Ng. P9/L P9/L STEAM GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE ASH PORE WATER FLOW LAYER AB-41D, AB-44AP, AB-44SS, AB-44D,GWA-285,GWA-28D,GWA-286R, GWA-295, GWA-29D, GWA-296R, ISA NCAC 02L STANDARD 1= 300 so STATION WATER LEVEL ELEVATION BACKGROUND THRESHOLD GWA-22D WELL IN TRANSITION ZONE GWA-30S, GWA-30D) REFERENCED TO NORTH AMERICAN VERTICAL DATUM (NAND) OF 1988. VALUE (SHALLOW FLOW zoNE)C 6 1,422 608 B GWA-216R WELL IN BEDROCK SHALLOW ZONE FLOW LAYER GROUNDWATER 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE ORIENTATIONS BACKGROUND THRESHOLD WELL IN ASH PORE WATER PLANT AL N RD. WELL WATER LEVEL ELEVATION AB-35S BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS CONCEPTUALLY ILLUSTRATED HERE, VALUE (DEEP FLOW ZONE)i 0.8 66s 256 $ DEEP ZONE FLOW LAYER GROUNDWATER TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY DISTINCT, CONSISTENT FRACTURE SETS, BUTA WIDE VARIETY OF FRACTURE ORIENTATIONS AT THE SITE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO BACKGROUND THRESHOLD RETIRED VALUE (BEDROCK FLOW ZONE)i 0.3 1,242 360 ASH ASIN � • GENERALIZED WATER TABLE WELL WATER LEVEL ELEVATION NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS (ASH STORAGE/ �� GENERALIZED GROUNDWATER V BEDROCK FLOW LAYER GROUNDWATER DEPTH ARE CONCEPTUAL ONLY. _- INTERIM MAXIMUM ALLOWABLE CONCENTRATIONS (IMACs) OF THE STRUCTURAL FILL) RETIRED FLOW DIRECTION WELL WATER LEVEL ELEVATION SSA NCAC 02L STANDARD APPENDIX 1, APRIL 1, 2013. ASH BASIN 3. ALL BOUNDARIES ARE APPROXIMATE. i- BACKGROUND THRESHOLD VALUES WERE CALCULATED USING ASH LANDFILL GENERALIZED ASH PORE WATER GWA-0 RL MEAN COBALT (CO) CONCENTRATION (ug/LDATA FROM BACKGROUND GROUND WATER SAMPLES COLLECTED FLOW DIRECTION Co ow MEAN 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019. Fe 401 MEAN IRON (Fe) CONCENTRATION (Ng/L) cATAweA RIVER 0 ASH "" MEAN MANGANESE (Mn) CONCENTRATION (ug/L) GRAPHIC SCALE Po c (LAKE WYLIE) 0 O ASH PORE WATER SAPROLITE WELL SCREEN �' DUKE o 100 zoo aoo' FIGURE 6-10c o As BIASIN BREAKLINE ENERGY HORIZONTAL SCALE: 1" = 400' VERTICAL SCALE: 1"=80' GENERAL CROSS SECTION B-B' n g ® [T TRANSITION ZONE BEDROCK �" - - - COMPLIANCE BOUNDARY CAROLINAS 5X VERTICAL EXAGGERATION VARIABLE GROUP DRAWN BY: J. CHASTAIN DATE:7/26/2019 MEANS OF COBALT, IRON AND MANGANESE SURFACE WATER REVISED BY: D. KREFSKI DATE:3/5/2020 NOTE: CHECKED BY: L.DRAGO DATE:3/5/2020 CORRECTIVE ACTION PLAN UPDATE CROSS SECTION B-B' IS LINEAR IN NATURE AND ALL LOCATIONS NOT ALONG THE CROSS SECTION ARE PROJECTED ONTO THE CROSS SECTION. _ _ PREDOMINANT BEDROCK FRACTURE ORIENTATION APPROVED BY: L. DRAGO DATE: 3/5/2020 PROJECT MANAGER: C. SUTTELL ALLEN STEAM STATION LAYOUT: XSECT6-10C BELMONT, NORTH CAROLINA www.synterracorp.com CROSS SECTION LOCATION WnTem 23 April 2020 L« (WEST) o a 0 z 700 0 a C�7 v0i ¢ Q 650—[— 1I SAPROLITE --/ GWA-19S 600 B < 50 SO4 <1 TDS 47 550 COMPLIANCE BOUNDARY RETIRED ASH BASIN ASH LANDFILL I I LL M M AB-355 - _____ ___ _________________________________________________________________ AB_34S __________ ___________—______ _______ _ ---- ____________---- ________ _______ 504 133 __— ________ - B all__________________________�"�`_- ________________________ TDs sss - _ =-___-____-___-=---P__�-__- --- _=- TDS ---------------------- AB-35PW5 ASH PORE �cr\rva111.u. c�rvc / — - soa a SAPROLITE WATER AB-32S l I III TIM 1 105 SAPROLITE \ ♦ - ♦ — AB-37D /' AB-36D GWA-15D AB-350 B 50 B <so 1 < GWA-19D / - g < 50 s0a 3.6 s Z 50 SO4 420 504 3.5 ^ ♦� SO4 2.6 �--\� j // ♦ % �T:TION ZONE 0 I \ TDS 155 ` \ / I / \ L �. \ /\I \ \\ AB-3 TDS 153 \ \\i1��' /\I ♦,BEDROCKL!—/\I ♦/�/ //S!/_—/\I\ I `�— I / /\ /1A /\ �Zf-'�c�`'�/ ~ / - - 1r�— , ✓�\ /\,v �_ ,, T�/1, I_I•/ \ /\ AB=�f- \/1, ` , , \ /1, 5Dq \ ` B _ i ''\� 1��\�� \/il\�� \lil\Y/ �� / 1 ��♦/ li\yil�`, ��/i/�`� �� r\/�/�/ ��/�/;`/ ��\ B <so il\♦/ I� \lil ♦/,I / \/ ` soa <s0 \\/%�;♦�i/;♦�y\;/i/;`� �� 1.3 \ /;`/ I/ TDs JS04 28 Lu \/�I%1�'\/\I/1♦'\/�I/�,\/\1/1♦/\/il/1`/-/� ♦/\/il/1`/ /\I Y\\/il/1`/ /\I \� TOS /\I ♦ \ TDS 98 \\' /\1 ♦/ `/- I /A1, I `/ 45 . I / \`i l \♦/ I\/ \ i l \\/ I / \ l \♦/ I / \�/ I / \`i l \♦/ I / \ i l \\/ I`/ \`� l \♦/ I / \ i l�\/ I / \`i l \♦/ I / \ i l�\/ I / . l \♦/ 00, j / \ i l \\/ I / \`i l \♦�1� \ i l \\/ I / \`� ♦/ I / \ i l \\f'� \`� l \♦/ I / \ ii�� \ `��♦/ I / \ —'./—�\�/./— \��'BEDROCK'./—\ `/\/\1/1 �' �/\I/1♦' \/\I/\, �\/\�1"\/\1/\/��/\1/\\' \/\I/1, ��/\I/1♦'\/\I/1, ��/\I/\♦' i/`1/1��\/\1/1♦'\/\1/1, ��/\I/1♦' `/\I/\, �\/\I/1"\/\1/1��\/\1/1♦' \/\I/1, ��. \ -ASH PORE a a WATER -------- GWA-15S --- _- __ _ - B 71 A B-37S �► SO4 11.1 B <50 TDS 107 SAPROLITE 504 2 TDS 112 RETIRED ASH BASIN ASH STORAGE STRUCTURAL FILL AREA w li i ��NM i0 aaaa w FILL -------- -ASH: -- ------------- ---- -- =-=mot=- --- ---_-------- __--- ----- --_ ASH PORE WATER C' it (EAST) I I I I I I I I I I I I J m m � LLY Q Q CATAWBA RIVER (LAKE WYLIE) EL.565' ALLUVIUM I B 1 <50 1 \/ 30-s q\/�q 04 37.6 OS 171 - / \♦ � GWA-oSBRA 6 1 736 SO4 1 56.7 1 `�\/\�!/L\�\1/1"\/\I/1,�\/\I/1"\/\I/\,�\/\1/1"\/\1/\,�\/\1/1"\/\I/1,�\/\I/1"K�\1/1,�\/\1/1"\/\1/\,�\/\I/1"\/\I/1,�\/\I/1♦'\/�LLI♦/�/\1/1♦'\/\I/1, �\/\I/1♦'\/\I. GWA-OSBRL `�\ \V ` / \ / \ 1 / 1 �' / \ I \ ' \ / \I / 1 �' / \I ♦ ' \ / \I / 1 �' / \I ♦ ' \ / \1 / \ � ' / \ I \ ' \ / \I / 1 �' / \I ♦ ' \ / \1 / 1 �' / \I \ ' \ / \ 1 / \ � ' / \I \ ' \ / \I / 1 �' / \I ♦ ' \ / \1 / 1 �' / \ I \ ' \ / \I / 1 � ' / \I \ ' \ / \1 4 d \ / 1 \ / 1 \ / 1 \ / 1 \ / 1 \ / 1 \ / 1 \ / 1 \ / 1 \ / 1 200 ♦ /i I BEDROCK I ♦ / \ ' I ♦ ' \ ' 1 \ ' \ ' 1 ♦ ' /� I \ ' I ♦ ' / \ I \ ' 1 ♦ ' / \ I \ ' I ♦ ' / \ I \ ' / \ I \ ' 1 ♦ ' / \ I \ ' I ♦ ' / \ I /� I /� I /� I \ ' I ♦ ' \ / / 1 \ / 1 / \ / 1 \ / 1 / \ / 1 \ / \ / \ / 1 \ / 1 / \ / 1 \ / 1 / \ / 1 \ / \ / \ / 1 \ / 1 BEDROCK; \ / 1 / \ / 1 \ / 1 / \ / 1 \ / / \ / \ \ i i l\♦/ i l\♦/ i i l\♦/ i l i i l\♦/ i t i i l i l i i l\♦/ i l i i l\♦/ i l\♦/ i i l i l i i l\♦/ i t i i l\♦/ i l\♦/ i i l i l i i l\♦/ i t i I� \ l l I� \ \\/ l l I�\ \\/ l l \`/ I� \ \`/ l l I� \ \\/ l l I�\ l l \`/ I� \ \`/ l l I�\ \\/ l l I�\ l l \`/ I� \ \\/ l l I�\ \\/ l 1. 150 /�— NOTES: _ ` 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS ' \ - 1 / /♦� - \ — \ /�- \ - \ / /♦� - — \ /♦- \ - \ / /♦� - — \ /♦- \ - \ / /♦� - \ — \ /�- \ - \ / /♦� - — \ /♦- \ - \ / /♦� - — \ /♦- \ - \ 'CALCULATED BASED ON CENTRAL TENDENCY OF DATASET USING DATA \ /♦- \ - \ /♦� - \ \ /♦- \ - \ /♦/ - \ \ /♦- \ - I RANGING FROM JANUARY 2018 TO JUNE 2019. LEGEND -\ / 2. BORON (B) CONCENTRATIONS ARE IN MICROGRAMS PER LITER (pg/L)- GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE ASH PORE WATER FLOW LAYER 3. SULFATE (504) AND TOTAL DISSOLVED SOLIDS (TDS) CONCENTRATIONS . \` �l ``/ I / \ i l \\/ I / \` l `♦/ / / \ i l `\/ I ' \` WATER LEVEL ELEVATION 700 650 600 550 500 450 250 200 150 100 ROAD GWA-22D WELL IN TRANSITION ZONE SHALLOW ZONE FLOW LAYER GROUNDWATER ARE IN MILLIGRAMS PER LITER (mg/L) NOTES CANAL GWA-21BR WELL IN BEDROCK WELL WATER LEVEL ELEVATION 4. -NO DATA AVAILABLE AB-35 ® WELL IN ASH PORE WATER ANALYTICAL PARAMETER B SO4 TDS 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, REFERENCED TO NORTH STATTII DEEP ZONE FLOW LAYER GROUNDWATER REPORTING UNITS pg/L mg/L mg/L AMERICAN VERTICAL DATUM (NAVD) OF 1988. ABANDONED WELL/ WELL WATER LEVEL ELEVATION GWA-5BR GEOTECHNICAL BORING 15A NCAC 02L STANDARD 700 250 500 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE PLANT AL N RD. C. BEDROCK FLOW LAYER GROUNDWATER BACKGROUND THRESHOLD ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS c AL34 WATER SUPPLY WELL - WELL WATER LEVEL ELEVATION VALUE (SHALLOW FLOW ZONE)' 50 5 154 CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY RETIRED (DEPTH UNKNOWN) MEAN BORON (B) CONCENTRATION (ug/L) BACKGROUND THRESHOLD 50 DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT 15 173 THE SITE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT THIS ASH BASIN _L _ GENERALIZED WATER TABLE Bs MEAN SULFATE (SO4) CONCENTRATION (mg/L) VALUE (DEEP FLOW ZONE)' SCALE. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL (ASH STORAGE/ STRUCTURAL FILL) RETIRED GENERALIZED GROUNDWATER �� 35 ros MEAN TOTAL DISSOLVED SOLIDS (TDS) BACKGROUND THRESHOLD 50 VALUE (BEDROCK FLOW ZONE)' 7 221 ONLY. ASH BASIN ASH LANDFILL FLOW DIRECTION CONCENTRATION (m g/L) i - BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA 3. ALL BOUNDARIES ARE APPROXIMATE. GENERALIZED ASH PORE WATER WELL SCREEN FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2O11 TO FLOW DIRECTION DECEMBER 2018 AS SUBMITTED IN JUNE 2019. 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. CA RIVER ASH ,\ BREAKLINE GRAPHIC SCALE m (LAKE WYLIE) 0 ASH PORE WATER DUKE 0 too zoo aoo FIGURE 6-11a �OpO g ON G - COMPLIANCE BOUNDARY GENERAL CROSS SECTION C-C' ALLUVIUM HORIZONTAL SCAALE:LE:180400' ACTIVE �, ENERGY CONSERVATIVE GROUP ASH BASIN ® FILL 5X VERTICAL EXAGGERATION g SAPROLITE CAROLINAS DRAWN BY: J. CHASTAIN DATE:7/26/2019 MEAN OF BORON, SULFATE AND TOTAL ® TRANSITION ZONE SED KREFSKI DATE: 3/5/2020 DISSOLVED SOLIDS (TDS) NOTE: CHEICKED BY: L.DRAGO DATE:3/5/2020 BEDROCK APPROVED BY: L. DRAGO DATE:3/5/2020 CORRECTIVE ACTION PLAN UPDATE CROSS SECTION C-O IS LINEAR IN NATURE AND ALL PROJECTED ONTO HE CROSS SECTIONCTION ARE SURFACE WATER PROJECT MANAGER: C. SUTTELL LAYOUT: XSECT(6-11A) ALLEN STEAM STATION CROSS SECTION LOCATION — — PREDOMINANT BEDROCK WnTerm www.s nterracor com BELMONT, NORTH CAROLINA Y P FRACTURE ORIENTATION Rev. 1 23 April 2020 Z O Q W J w 700 650 600 550 200 150 C C' (WEST) COMPLIANCE BOUNDARY (EAST) Q RETIRED ASH BASIN _ I ASH I STORAGE STRUCTURAL FILL I. RETIRED ASH BASIN ASH LANDFILL o AREA rn I CL I 700 °Ln Q Q F I°rM, INr, N I y �� rn a s r ;�aaaa v00i o I J Q Q -ASH PORE m r _____ _ a s SAPROLITE a �+ M M WATER m co lwa �? -____ __ ____ - FILL M M N N I 650 00 Q a s FILL � _====_- 00 00 M M ca -- _ -- --- ----- -- ------------------------- --- _ _-�_____-____-_-_ -==-ASH:-� - -------------------- ---- --- _ _ _ _ -- ------ -- — ------------ ---------------� _ -- ----------------------- _----- __ _______________ __--______ ____ _______________ -----__ ____________________________________________________________________ rlf 4Y rA N swA-i9s AB -sus AB-3Bs =_-- ---' ASH PORE WATER= -_ ______ ________ _____ ___ __- _--_--___ ---------------_________________-__=____-__ =____ srUzi .------------------------ - - -- ---- --v--=_ -- __-------------------- �4SFC ------- A r r r ------- 0-----------------------�------------------------ ------------------- -600 1765 - ___ _ ________= sr AB-35s� ____ ________ sr _____ ____-_—_--- Vr Vr � C(LAKE W RIVER ---------- ----------------------------------------- ------_------- �wA-isD SAPROLITE ____-=== ____ ____-=======-__=====-=== ==_=_ - ____=JALFLUVIUM (APPROX.) I___---_ ASH PORE WATER TRANSITION ZONE SAPROLITE AB 550 SAPROLITE ai sr m-500 TRANSITION ZONE \A`` iI./\.l3EDRO61eZZcwAo I'or \/I�\/il\/I�\• 7 7/\ ��\\\y/1\/\/\T\ \%//1\/\/\/1 �\Y\\/1\/ /\ i l \-450 `y i \ I \ 7 \ I \ \ A \ \ .. / — — \ . / — \ \ ..BEDROCK . / — \— \ / \I \ /_— I \— \ / 1 / \ / 1 / \ / ♦ / 1 / \ / \ / \ / \ / 1 / \ / 1 / \ / ♦ / \ / \ / 1 / \ / ♦ / 1 / \ / 1 / \ / \ / 1 / \ / 1 / \ / ♦ / 1 / Z / 1 / \ / ♦ / \ / \ / 1 / \ / \ / \ / \ / 1 / \ / / \ / \ / \ , \ F -A-osBRL / \ 250 \/\I/\` 200 6EDROCKIBEDROCK;\/\I/1`/�/\I/1\/\/\I/1`/�/\I/1`/\/\I/ l\\/ 1, l -150 NOTES: /\-- \ — \ /\— \ ' 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS - - - - - - - - - - - - - I CALCULATED BASED ON CENTRAL TENDENCY OF DATASET USING DATA LEGEND RANGING FROM JANUARY 2018 TO JUNE 2019.100 - 2. STRONTIUM (Sr) CONCENTRATIONS ARE IN MICROGRAMS PER LITER GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE ASH PORE WATER FLOW LAYER (u9/L) GWA-22D WELL IN TRANSITION ZONE WATER LEVEL ELEVATION 3. -NO DATA AVAILABLE— NOTES CANALROAD GWA-21BR WELL IN BEDROCK SHALLOW ZONE FLOW LAYER GROUNDWATER ANALYTICAL PARAMETER Sr ALLEN STEAM AB-35 WELL IN ASH PORE WATER WELL WATER LEVEL ELEVATION REPORTING UNITS WELLS 8N MARCH 13, 2019, REFERENCED TO DEPTH TO WATER GAUGED IN OUM NNE 1 STATION TIO DEEP ZONE FLOW LAYER GROUNDWATER 15A NCAC 02L STANDARD NE NORTH AMERICAN VERTICAL AT. NAVD) OF 198NITORING GWA-56R ABANDONED WELL/ 0 GEOTECHNICAL BORING WELL WATER LEVEL ELEVATION BACKGROUND THRESHOLD 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE VALUE (SHALLOW FLOW ZONE) PLANT AL N RD. C. BEDROCK FLOW LAYER GROUNDWATER AL34 WATER SUPPLY WELL - WELL WATER LEVEL ELEVATION BACKGROUND THRESHOLD CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY RETIRED (DEPTH UNKNOWN) VALUE (DEEP FLOW ZONE)' 240 DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT ASH BASIN MEAN STRONTIUM (Sr) CONCENTRATION (ug/L) THE SITE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT GENERALIZED WATER TABLE (ASHSTORA s �� BACKGROUND THRESHOLD THIS SCALE. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE 181 STTRUCTURAL FILL) FILL) RETIRED GENERALIZED GROUNDWATER VALUE (BEDROCK FLOW ZONE)' CONCEPTUAL ONLY. WELL SCREEN ASH LANDFILL FLOW DIRECTION i - BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA 3. ALL BOUNDARIES ARE APPROXIMATE. � onw.o, GENERALIZED ASH PORE WATER BREAKLINE FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2011T0 FLOW DIRECTION ✓� DECEMBER 2018 AS SUBMITTED IN JUNE 2019. 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. CA RIVER 0 ASH - - - - COMPLIANCE BOUNDARY GRAPHIC SCALE N �No g (LAKEwvu6) 0 ASH PORE WATER DUKE 0 100 200 400 FIGURE 6-11 b ACTIVE ASH BASIN o ALLUVIUM 4*5 ENERGYHORIZONTAL 1E:1S0aoo' VERTICAL SCALE: GENERAL CROSS SECTION C-C' ® FILL 5X VERTICAL EXAGGERATION NON -CONSERVATIVE GROUP g SAPROLITE CAROLINAS MEAN OF STRONTIUM DRAWN B DATE: 41P TRANSITION ZONE NOTE: ® REVISED BY: D. KREFSKI DATE: 3/5/2020 : D. KR FSK CHECKED BY: L.DRAGO DATE:3/5/2020 CORRECTIVE ACTION PLAN UPDATE CROSS SECTION C-C' IS LINEAR IN NATURE AND ALL LOCATIONS NOT ALONG THE CROSS SECTION ARE %T T% BEDROCK APPROVED BY: L. DRAGO DATE: 3/5/2020 PROJECT MANAGER: C. SUTTELL ALLEN STEAM STATION OSS CROSS SECTIONGLOCATIDONEDTIGN. _Te - SURFACE WATER PREDOMINANT BEDROCK I LAYOUT: XSECT(6116) BELMONT, NORTH CAROLINA FRACTURE ORIENTATION www.synterracorp.com 23 April 2020 C C' (WEST) COMPLIANCE BOUNDARY (EAST) Q RETIRED ASH BASIN I ASH STORAGE STRUCTURAL FILL I. RETIRED ASH BASIN ASH LANDFILL Z AREA 700 0. 700 fM i 3� o „ ;�� mmmmN � a a aaa I Q Q Q n ASH PORE r M C? �'? �? ------ --- _ FILL e g M M G 650 SAPROLITE WATER 650 Q Q Q Q FILL rn _ _ Q Q M M i � ------- ----------------------- ---- ____-_-__-_--________-----___-___ _--------------------------------------------------- I GWA-195 __ _________ _____ ____ _------------- ----_-______-___-_________________________-__-____-__-____-__-____-__-__--_- V) 0mC0.1 AB_365_____________________________ __--- ______-- ____ -_________-______-__________________________---= L? Inco 0.z Fe z� =-_----_ -- ASH PORE WATER: Coa3____ - ________ = AB-aas-�_=_�_ ________________—____-__—___-- ------ uTca 17----------------------- __------------- --- ----------- --------_____====== a a a 600 600 Fe 20. Co <0.1 --_ _ _________ ___ Fe 37580 __� ________ _ ____-_________________________________ Mn 25 �� Fe 13754 - ______ - - Co 19 _____________________' _-�_ ________________ Mn 17 Fe 139 Mn 6302 =----------- ---_-------------------------_____-_--- - CATAWBARIVER I I :WA-1sD Mn lz Mn 1127 -__- -- __ (LAKEWYLIE) SAPROLITE Mn 7916 __ ___________ ___-_ - _--_____-- EL.565' Fe <5D AB-35PW5-------- ------ (APPROX.) Mn4 Co 0.6 -------- I ASH PORE — 550 \ _ \ AB 36D Mn 1m WATER ILL 550 TRANSITION ZONEi SAPROLITE AB-3z5 AB 37D Co <D.1 / \ /� /_ Fe 133 SAPROLITE co v.1 \ co a1 \� /` _ \ Mn s AB-35D Fe 39240 ALLUVIUM �� / ' \/� / I' \/i+r✓t�/� i / I/ \/ i / I� \/' Lo <0.1 Mn 6a14 co Fe \' \ 1 / / \ / \ I / 1 ` / \ v\ / — �— 500 50 T� \ Mn cs ♦ \ — 1 \ —_—\ _ Fe 1250 Z / I / \ \�J \T I / \ / 7 \i l \ / / l \/ 7 `i \ TRANSITION ZONE Fe zFn \ I co I' I /\/ /\I\/V/I./\�-/\�♦/IS \`—\i♦/ �.7-\\i./--/.rrt \�i�.�-_��♦/-\� Mn 6 �+--/\I�/ Fe zsa- Mn sao4 _ _ I \ BEDROCK a!— oe\ i \ / 1 / \ / 1 / .�/> 7 1 , \ /� \ / \ / \ / -► . , A&35BR /♦-L \ — 1 �` \ /\-= C— \ /♦-- \ ' 1 /y \ — \ /♦-- \ `\I \ /♦-- \ 1 /�-_ \ - \ _/h_/-- \ \ ' /♦-_i`\ 1 /♦-_ \ co az /♦-_ \ — \ ' /.-_ \ - 1 /♦-_ \ — \ ' /♦ \ - 1 /♦-_�\ 1' /♦ \ \ /♦-_ !`— \ ' /. i /\/� ��I'\/�/\/Ik/I�\lil\/li\li \/17\/C /\/17\4i \/17\/il\/17\lI'\/17\/il\/I7\li \/I�\„ Fe 94 \/I'\/�/�/17\/�/I'\/�/\/ •eF� \jT'\l�l\/17\�i� \/I�``l�l\ W47 \�``/ i�/- \ / i♦/- \�♦/ !�♦/ \��/ ice/ /\��/ ice/ �C�♦/- �/ i i,(/ i i�W45�l/''/''/', Mn 9T\e 450 - \/ - '/- - \/ - �- '/- 1/ - \ - '/ \/ - \ - '/ - \/ - \ - '/f - 1/ - \ - '/ - - lk- \ y`CI / - \ - '/ -�1/ - \ - '/ \/-\ -'/ / \\i l \♦/ / \ i l \\/ I / i l \\/ I /\/ I / \` i l \`/ I / \ i l \\/ �/ i l \♦/ I / \ i l�\/ I / \`i l \�/ I / \ i l�\/ I / \ i l \�/ I / \ i / \\/ I / \\i / \♦/_h(\ i l \/ \ / \� \/ I / \ / \ % \� / / / \ �1 /C, \ ( `/ / / / — \ / \ i _ / — \ i ♦ / — \ i _ _ ♦ / — \ i / \ I \ / i� / — \ i `I \ i ♦ / / \ '` '\ I \ \ / I i \ GWA-OSBRA \ _ \ �\ \ .BEDROCK . / — \ .. / — /\/\I/1 \`/\/\1/1�/\/\1/\/\/\'/1�/\/\1/1\/\/\'/1\/\/\1/1`/ /\1/1�/�/\1/\�/\/\'/1�/�/\I/1�/ /\' \/\ I/1\/ /\I \/\ I/1♦/ /\I ./\ I 200 200 66116CKI/1♦/\/'/1\//\'/1`/\/'/1\//\'/1\/\/�I/1\//\I/\\/\/'/1\//\'/1`/\/\1/1`//\1/1`/\/\1/1\/�/\1/1`/\/\'/1\/\BEDROCK;\/\I/1`/�/\1/1`/\/\1/1\/�/\'/1`/\/\'/ l i \l i l\/ I�\ i t \�/ l i l i l\ / 1 7 \ i l\♦/ l i l i l\/ 1 7 \ i l \\/ I i l i l\ / 1 7 \ i l\♦/ I i l i l\/ 1 7 \ i l\♦/ l i l i l\/ I�\ i t \�/ l i l i l\ / 1 7 \ i l\♦/ I i l i l\ / 1 7 \ i l \\/ I i l i l\/ I�\ i t \�/ l i l i l\ / 1 7 \ i l\♦/ l i l i l\/ 1 7 \ i l \\/ I i l ♦/�/\1/1//\/\1/1` / \/\'/1, �\/\'/1`/\/\'/1, �\/\'/1\/ \/\1/1/�\/\1/\�/\/\'/1, �\/\'/1\/ \/\1/1/�\/\1/1` /\/\1/1��\/\1/1�/ \/\'/1, �\/\'/1\/\/\1/1/�\/\1/1` / \/\1/1, �\/\'/1`/\/\'/ ��\/\'/1\� \ 150 150- 17 \\ i �\`/ I / \ i l \\/ 17 \` �\♦/ I / \ i l \\/ 17 \\ �\\/ I / \ i / \\/ 17 \\ �\`/ I / \ i / \\/ 17 \` �\♦/ I / \ i l \\/ 17 \` �\\/ I / \ i l \\/ 17 \\ i / , NO'TES: /_ \ i l \\/ 17 \` �\♦/ I / \ i l \\/ 17 \\ �\♦/ I /_ \ i l `\/ I , \\ ♦ / / \ 1 / 1 \ \ / \ 1 ♦ / ` / \' / 1 ` \ / \' ` / ` / \' / 1 \ \ / \' \ / ` / \ I / 1 \ \ / \ 1 ♦ / ` / \' / 1 ` \ / \' ` / ` / \ / \ I / 1 \ \ / \ 1 ♦ / ` / \ \ 11. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS / \ I ♦ / \ / \ I / 1 ` / \ / \ I / ♦ / \' / ` / \ / \ I / \ t ♦ \ t \ \t ` \ t \t \ \l CALCULATED N ON CENTRAL �TENDENCY OF DATASET USING DATA .i/ i/.RANGING FROM O8T0 ]LIN/`ii_♦ i�1�/;1/�-\�/\/�' \\�/�1/\-1�/♦//i 2. COBALT (Co), IRON (Fe), AND MANGANESE (Mn) CONCENTRATIONS ARE / - ` I ` / \ / - \ I ♦ / - ` I ` / ♦ , - ` I \ / - \ I \ / \ / LEGEND \ / \ / 1 IN MICROGRAMS PER LITER (Ig/L) /\ -\ / -/\ 1,\ �1 /\ \/\ � GWA-22S -100 WELL IN FILVALLUVIUM/SAPROLITE ASH PORE WATER FLOW LAYER 3. -NO DATA AVAILABLE GWA-22D WELL IN TRANSITION ZONE WATER LEVEL ELEVATION ANALYTICAL PARAMETER Co Fe Mn SHALLOW ZONE FLOW LAYER GROUNDWATER REPORTING UNITS pg/L pg/L pg/L NOTES GWA-21BR WELL IN BEDROCK L WELL WATER LEVEL ELEVATION 15A NCAC 02L STANDARD 1* 300 so sTEA WELL IN ASH PORE WATER BACKGROUND THRESHOLD 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, REFERENCED TO DEEP ZONE FLOW LAYER GROUNDWATER srnrlo AB-35S VALUE (SHALLOW FLOW ZONE)' 6 1,422 608 NORTH AMERICAN VERTICAL DATUM (NAND) OF 1988. RIVER NOTE: CROSS SECTION C-C' IS LINEAR IN NATURE AND ALL LOCATIONS NOT ALONG THE CROSS SECTION ARE PROJECTED ONTO THE CROSS SECTION. CROSS SECTION LOCATION GWA-5BR ABANDONED WELL/ GEOTECHNICAL BORING AL34 WATER SUPPLY WELL - (DEPTH UNKNOWN) GENERALIZED WATER TABLE GENERALIZED GROUNDWATER FLOW DIRECTION GENERALIZED ASH PORE WATER FLOW DIRECTION ASH 0 ASH PORE WATER 0 ALLUVIUM ® FILL 0 SAPROLITE ® TRANSITION ZONE 0 BEDROCK SURFACE WATER — PREDOMINANT BEDROCK FRACTURE ORIENTATION WELL WATER LEVEL ELEVATION BEDROCK FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION DI MEAN COBALT (Co) CONCENTRATION (pg/L) Fe o.� MEAN IRON (Fe) CONCENTRATION (pg/L) s' MEAN MANGANESE (Mn) CONCENTRATION (pg/L) WELL SCREEN BREAKLINE — — — — COMPLIANCE BOUNDARY BACKGROUND THRESHOLD VALUE (DEEP FLOW ZONE)' 0.8 665 256 BACKGROUND THRESHOLD VALUE (BEDROCK FLOW ZONE)' 0.3 1,242 360 - - INTERIM MAXIMUM ALLOWABLE CONCENTRATIONS (IMACS) OF THE 15A NCAC 02L STANDARD APPENDIX 1, APRIL 1, 2013. '- BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN TUNE 2019. 'DUKE n ENERGY CAROLI NAS 161P synTerra 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT THE SITE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY. 3. ALL BOUNDARIES ARE APPROXIMATE. 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. GRAPHIC SCALE 0 100 200 400 HORIZONTAL SCALE: 1" = 400' VERTICAL SCALE: 1" = 80' 5X VERTICAL EXAGGERATION DRAWN BY: J. CHASTAIN DATE: 7/26/2019 REVISED BY: D. KREFSKI DATE: 3/5/2020 CHECKED BY: L.DRAGO DATE: 3/5/2020 APPROVED BY: L. DRAGO DATE: 3/5/2020 PROJECT MANAGER: C. SUTTELL LAYOUT: XSECT(6-11C) www.synterracorp.com FIGURE 6-11c GENERAL CROSS SECTION C-C' VARIABLE GROUP MEAN OF COBALT, IRON AND MANGANESE CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 Z O H W J W D (WEST) I I I mCGfA I I I I 700 CV N N N aaaa ti � M J a - a as 650 _ -- ----- L---- ------ — ---- — --- GWA-21S AB-135 8 <50 B 150 504 <1 504 16 600 TOS 31 i 11 11 I TDS &5 NI SAPROLITE I AB 130 550 j 122 TRANSIT( (TIIIIIIIIIIIIIIII ZONE COMPLIANCE BOUNDARY ASH BASIN PRIMARY POND 1 PRIMARY POND 2 PRIMARY POND 3 , mCfAfp d'd'J f/l vvva mmtnrnv� N N N N c N N N N N I aaaa mmmmm SASH v aaaaa v _______________ ___________ Jr__ --__—______ AB-255 - ____________________ ______________________ _ ASH PORE _ _==�__�=__�=__� 1 1_____________ ----- WATER ___ RE —__-�-E ASH PORE WATER_ AB-24S _ __-_---_---_---_---_---_-_____-___-___- B 773=_—__- ____ ____ __ _--- AB-255L-_---_____________________________ _______ SAPROLITEFILL AB-245L � so B lOGS - B 631 soa 3s3 SAPROLITE SO4 1&3 1176 183 T09 127 AB-26s ��L A&2555 B 1046 B 1213 504 65.8 SO4 27.2 TDS 1sz TDS 158 B 50 \ / \ / — _ \ I \ AB 25BRU — It\ / \ / I / 1 \ / \ I / 1 \ / \ / \ \ / \ I / 1 \ / \ / SO4 / \ I / \ / / B <5o TRANSITION 500 \I— 1'/ — /\ — 1�'/ —�/\ — 1�, — /� —t'/ — /\ — 1'/ — /\ _ 1� DS 1'/ — /\ — 1� — soa ZONE AB-24BR B A 21D 50 I/\ \ / I / \\ \ �/ I / \ \' /\ / I / \\ / I / \ \' / / I / \\ B 50 AB-25BRU / — j soa 1 14 BEDROCK\� / 1 \ \ / \ I / 1 \ \ / \ I / 1 \ \ // I / 1 \ / \ / \ TDS 97 ,/ \ I / 1 \ B <so /TDS 134 / / i 16 DROCK /- D e/_TDS AB_ -21BR450 GA BEDROCK' B325 �50 9 SO4 z /117G- 400 200 7♦/ I \/—`'I\7\�—� I \/—\'I\7\�—� I \/—`'I\7\�—� I \/—\'I\7\�—� I \/—\'I\r\�—� I \/—\'I\7\. BEDROCKS 150 BEDROCK(X Lsd'\ %\ 1001 NOTES LEGEND GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE GWA-22D WELL IN TRANSITION ZONE CANAL ROAD GWA-216R WELL IN BEDROCK ALLEN STEAM STATION AB-35S WELL IN ASH PORE WATER GWA-5BR ABANDONED WELL/ PLANT AL N RD. GEOTECHNICAL BORING AL34 WATER SUPPLY WELL - RETIRED (DEPTH UNKNOWN) ASH BASIN J GENERALIZED WATER TABLE (ASH STORAGE/ STRUCTURAL FILL) RETIRED GENERALIZED GROUNDWATER ASH BASIN ASH LANDFILL FLOW DIRECTION GENERALIZED H PORE WATER FLOW DIRECTION RIZ ASH rn (LAKE WYLIE) JPD ASH PORE WATER o ACTIVE ALLUVIUM 0 ASH BASIN ® FILL 0 0 SAPROLITE NOTE: ® TRANSITION ZONE CROSS SECTION D-D' IS LINEAR IN NATURE AND ALL :;-,- , �_v. BEDROCK - LOCATIONS NOT ALONG THE CROSS SECTION ARE PROJECTED ONTO THE CROSS SECTION. SURFACE WATER CROSS SECTION LOCATION MINANT FRACTOURE ORIENTDATIION ASH PORE WATER FLOW LAYER WATER LEVEL ELEVATION SHALLOW ZONE FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION DEEP ZONE FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION BEDROCK FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION swAamA MEAN BORON (B) CONCENTRATION (ug/L) R « MEAN SULFATE (SO4) CONCENTRATION (mg/L) 5oa MEAN TOTAL DISSOLVED SOLIDS (TDS) TM CONCENTRATION (mg/L) WELL SCREEN BREAKLINE ----- COMPLIANCE BOUNDARY J m a� m � r1 � a CATAWBA RIVER C9 (LAKE WYLIE) EL. 565' (APPROX.) IDS r' GWA-03D I 700 650 600 550 500 450 GWA-03BRA B 85 1 400 04 1 17.8 /_-\200 _ 1 150 A:WA-GBBRL100 NOTES: 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS CALCULATED BASED ON CENTRAL TENDENCY OF DATAS ET USING DATA 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, REFERENCED TO�o ,�.Q T� _ NORTH AMERICAN VERTICAL DATUM (NAVD) OF 1988. 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT THE SITE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY. 3. ALL BOUNDARIES ARE APPROXIMATE. 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. 'DUKE n ENERGY CAROLINAS 161P synTem GRAPHIC SCALE 0 100 200 400 HORIZONTAL SCALE: 1" = 400' VERTICAL SCALE: 1" = 80' 5X VERTICAL EXAGGERATION DRAWN BY: J. CHASTAIN DATE: 7/26/2019 REVISED BY: D. KREFSKI DATE: 3/5/2020 CHECKED BY: L.DRAGO DATE: 3/5/2020 APPROVED BY: L. DRAGO DATE: 3/5/2020 PROJECT MANAGER: C. SUTTELL LAYOUT: XSECT_DD (6-12A) www.synterracorp.com 2. BORON (B) CONCENTRATIONS ARE IN MICROGRAMS PER LITER (ug/L) 3. SULFATE (SO4) AND TOTAL DISSOLVED SOLIDS (TDS) CONCENTRATIONS ARE IN MILLIGRAMS PER LITER (mg/L) 4. -NO DATA AVAILABLE ANALYTICAL PARAMETER B SO4 TDS REPORTING UNITS Ng/L mg/L mg/L 15A NCAC 02L STANDARD 700 250 Soo VALUE (SHALLOW FLOW ZONEV 50 5 154 VALUE (DEEP FLOW ZONE)i 50 15 173 BACKGROUND THRESHOLD 50 7 221 VALUE (BEDROCK FLOW ZONQ) '-BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019. FIGURE 6-12a GENERAL CROSS SECTION D-D' CONSERVATIVE GROUP MEAN OF BORON, SULFATE AND TOTAL DISSOLVED SOLIDS (TDS) CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 700 650 600 550 (WEST)0 T) 1 _ COMPLIANCE BOUNDARY - D' (EAST) ASH BASIN Q i PRIMARY POND 1 PRIMARY POND 2 PRIMARY POND 3 r� N N N d[v'1 1 24 I I I I I I I SAPROLITE I I I I I I I I I �m ------------- AB-13S sr 67 AB-13D Sr 1 MMTNSITION I � J �, mCfAfp mm dJd) vvva u�u�Inu�v1 N N N N N N N N N ASH QQQQ QQQQQ WA I AB-24S 'I" SAPROLITE \ AB-24SL �� A�zsss SAPROLITE sr z37 �� NIIN ASH uu /1// TRANSITION 500 Q \ - 1 ' / / _ �`I ' - 1 / — \ ' / — \ \ / \ �/ 1 / ' - t' / — \ ' / — \ \ \ / 1 / ' - 1 / _ \ \ / _ / - 1 AB 258R / / _ 1 ZONE W GWA-21DA: I ` / / \\/ I / \\ / \ % I \ / / \\/ I / \\ / \ ' I \ / / (x/ I / \` / sr 103 W I / \ /� / 1 BEDROCK\ / 1 \ /� / 1 \ //� / 1 \ / 1 \�/� / 1 \ / 1 \ / ` \BEDROCK_ 450 ,� � \` �� / .� 1 sr 1 164 — _ _'BEDROCK I _ �/ / \ / I / \/ / \ I \/ y��'1 I / \ l / sr 1 225 /1/�\/\I/1\�\/� /1/�\/\I/1\�\/� /1/�\/\I/1\�\/� /1/�\/\I/1\�\/� /1/�\/\�/1 _ �•/1/�\/\/1\�\/� LUU BEDROCK\ BEDROCK 100 NOTES ASH BASIN NOTE: CROSS SECTION D-D' IS LINEAR IN NATURE AND ALL LOCATIONS NOT ALONG THE CROSS SECTION ARE PROJECTED ONTO THE CROSS SECTION. CROSS SECTION LOCATION LEGEND GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE V ASH PORE WATER FLOW LAYER GWA-22D WELL IN TRANSITION ZONE WATER LEVEL ELEVATION GWA-21BR WELL IN BEDROCK SHALLOW ZONE FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION AB-35S WELL IN ASH PORE WATER DEEP ZONE FLOW LAYER GROUNDWATER GWA-56R ABANDONED WELL/ WELL WATER LEVEL ELEVATION GEOTECHNICAL BORING BEDROCK FLOW LAYER GROUNDWATER AL34 WATER SUPPLY WELL- WELL WATER LEVEL ELEVATION (DEPTH UNKNOWN) MEAN STRONTIUM (Sr) CONCENTRATION (ug/L) GENERALIZED WATER TABLE GENERALIZED GROUNDWATER FLOW DIRECTION WELL SCREEN GENERALIZED ASH PORE WATER FLOW DIRECTION BREAKLINE 0 ASH ----- COMPLIANCE BOUNDARY ASH PORE WATER 0 ALLUVIUM ® FILL SAPROLITE ® TRANSITION ZONE BEDROCK — SURFACE WATER -- PREDOMINANT BEDROCK FRACTURE ORIENTATION 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, REFERENCED TO NORTH AMERICAN VERTICAL DATUM (NAVD) OF 1988. J Ix m M Q 0 CATAWBA RIVER (LAKE WYLIE) EL. 565' (APPROX.) GWA-035 L % 700 650 600 550 500 450 400 \ GWA-B3 \— % Sr 331 \ - LUU 150 -100 NOTES: 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS CALCULATED BASED ON CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019. 2. STRONTIUM (Sr) CONCENTRATIONS ARE IN MICROGRAMS PER LITER (Pg/L) 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC 3. -NO DATA AVAILABLE BOREHOLES. AS CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING ANALYTICAL PARAMETER Sr RESULTS DID NOT INDICATE ANY DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT THE SITE. THE ACTUAL NUMBER OF REPORTING UNITS Ng/L FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE 15A NCAC 02L STANDARD NE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY. BACKGROUND THRESHOLD 3. ALL BOUNDARIES ARE APPROXIMATE. VALUE (SHALLOW FLOW ZONE)' 300 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. BACKGROUND THRESHOLD 240 VALUE (DEEP FLOW ZONE)' BACKGROUND THRESHOLD VALUE (BEDROCK FLOW ZONE)' 181 'DUKE n ENERGY CAROLINAS synTena GRAPHIC SCALE 0 100 200 400 HORIZONTAL SCALE: 1" = 400' VERTICAL SCALE: 1" = 80' 5X VERTICAL EXAGGERATION DRAWN BY: J. CHASTAIN DATE: 7/26/2019 REVISED BY: D. KREFSKI DATE: 3/5/2020 CHECKED BY: L.DRAGO DATE: 3/5/2020 APPROVED BY: L. DRAGO DATE: 3/5/2020 PROJECT MANAGER: C. SUTTELL LAYOUT: XSECT_DD (6-12B) www.synterracorp.com '-BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN TUNE 2019. FIGURE 6-12b GENERAL CROSS SECTION D-D' NON -CONSERVATIVE GROUP MEAN OF STRONTIUM CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 (WEST) COMPLIANCE BOUNDARY (E (EAST) i I �I� ASH BASIN — I I I m p C N i PRIMARY POND 1 — — PRIMARY POND 2 PRIMARY POND 3 700NNNN700 J 04 J mc10 mmmmrn Q J N N N N f V to N N N N cn N N mmmm mmmmm a QaQ�a QaQ ASH mm 650 ASH a s � a s J 650 ---i------------ -----� ----- - m ----------- ______________________________-___--- ------------------------------------------_- -_�_ _ AB-13s--__------------ - -___= ASH PORE _ ---------------------- Co__ �__�____'_ GWA-21S — ----------------- _ AB-255 = ____________ ________________________ co 11 aB __-__ WATER ==__ =__'_ __ ___ ___ ___ ____ co z '='_'_'_'_'_= _==___ _ ==_ U) p 1011 m a Fe w Fe s7 -----------=-_-=_=__-=_= - — - = Fe 47v == ASH PORE WATER =____=_==____==____= eh C? C? ------------- - - Mn 78•. �� --_ Fe 3480-_____________________ Mn 188 __________ Mn 66 �� Mn 95 _____ _ _ _____ _ _____________________________= Q 600 �- - ___=_____ 600 ______ _ __ CATAWBA RIVERSAPROLITE AB-13D SAPROLITE a�z4sL _`.__ _ Co <alC.FILL V' (LAKE WYLIE) C. 0.1 = EL.565' Fe 129 F^ S Mn 30 SAPROLITE (APPROX.) �Z---------- Mo 8 ANSITION �► AB-25S5 550 TRZONE Co 1 Fe 43 550 \ — Fe 107 Mn IF 240 GWA-035 Co 115 Z — \ k \ / — \ / \ / — _ \ / \ / — \ / \ / — _ \ Co - / \ / — _ A&258RU Fe 7092 \ \ / \ / I / 1 / \ I \ / \ / \ I �'li\ / \ I \ / \ / Fe / \ I \ / \ / co \ / \ TRANSITION Mtn 2130 /� �� / \ /1 '� / \ /1 /1 /1 500 / / - \ / - / _ / - T / - _ i / _ / _ 1 Mn i / _ / _ 1 Fe _ / _ / \ _ \ ZONE 500 Q Mn 7 \ / \ — / — / x AB-24BR x — / W GWA-21DA / / \ / I / \\ / \ I / \ / / \ / I / / \ / I / \ / / (/ I / \\ / / / I / J Co 0.1 / _ \ — \ /I \ / \ / — \ Fe 88AB-258R \ / LU / Fe 187 I / 1 BEDROCK\ I / 1 \ \ / \ I / 1 \ / \ / Mn ss \ I / 1 \ `/\ / \ wl� \ 1 /i BEDROCK- / \ \— \ \i \— \ \— \ \— \ /\ — \ AB-26D 450 / GWA-218R / \/ / / \ / I / \/ / / \ / I / \/ / %\ / I / \/ / / \ / I / \/ / \ / I BEDROCK` / I / \ / I / \/ / / co a3 450 \ Fe 337 Mn 100 GWA-03D X MFen 1333 GWA-03BRA 400 co al \ 400 Fe <w�\\—/ Auu \ / I \ / — I - \ / I \ / — I - \ / I \ / — I - \ / I \ / — I - \ / I \ / — I - \ / I \ / — I - \ / I \ / — Auu / \\ / \\ BEDROCK\ / \\ / \\ 150 1/ \/� /1\/\ /1 �\/\ /1\/\ /1 \/\ /F-7—_.tip\ /1 /I \/\ /\\/\ \\\//I /1 j.\'o'�\\ /I \/\ /\\/\ \\\//I /1 /I \/\ /1\/\ /\�//I /1 \ / �\/\ /1 �\/ 150 1J / / BEDROCK � / I / \/ / \ \/- \ / 100 \ - I \ / ` - 1 \ / \ - I \ / 1 \ - I \ / \ - I \ / \ - i \ / I \ / 100 NOTES LEGEND 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, REFERENCED TO GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE V ASH PORE WATER FLOW LAYER NORTH AMERICAN VERTICAL DATUM (NAVD) OF 1988. GWA-22D WELL IN TRANSITION ZONE WATER LEVEL ELEVATION 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE V SHALLOW ZONE FLOW LAYER GROUNDWATER ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS GWA-21BR CANAL ROAD 0 WELL IN BEDROCK WELL WATER LEVEL ELEVATION CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE STEAM AB-35S WELL IN ASH PORE WATER DEEP ZONE FLOW LAYER GROUNDWATER ANY ,LEN OR EONTATINCTNS AOT THIE SITSTETHE THAE CTURE ACTUAL NUMBER OFSETS, BUT AIDE FRACTURVARIEB SFFAR TOORNUMEROUS STATION ABANDONED WELL/ GWA-5BR WELL WATER LEVEL ELEVATION TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES G O C C L 0RI111 ASHBASIN 3H LANDFR NOTE: CROSS SECTION D-D' IS LINEAR IN NATURE AND ALL LOCATIONS NOT ALONG THE CROSS SECTION ARE PROJECTED ONTO THE CROSS SECTION. CROSS SECTION LOCATION 0 ASH 0 ASH PORE WATER 0 ALLUVIUM ® FILL 0 SAPROLITE ® TRANSITION ZONE 0 BEDROCK SURFACE WATER ---- PREDOMINANT BEDROCK FRACTURE ORIENTATION V BEDROCK FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION GwA-o3BRL MEAN COBALT (Co) CONCENTRATION (IJg/L) C° Q1 MEAN IRON (Fe) CONCENTRATION (IJg/L) M„ MEAN MANGANESE (Mn) CONCENTRATION (IJg/L) WELLSCREEN a BREAKLINE ----- COMPLIANCE BOUNDARY 3. ALL BOUNDARIES ARE APPROXIMATE. 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. GRAPHIC SCALE 0 100 200 400 if DUKE ENERGY HORIZONTAL SCALE: 1" = 400' VERTICAL SCALE: 1" = 80' 5X VERTICAL EXAGGERATION CAROLINAS DRAWN BY: J. CHASTAIN DATE:7/26/2019 REVISED BY: D. KREFSKI DATE: 3/5/2020 CHECKED BY: L.DRAGO DATE: 3/5/2020 APPROVED BY: L.DRAGO DATE: 3/5/2020 PROJECT MANAGER: C. SUTTELL LAYOUT: XSECT_DD (6-12C) www.synterracorp.com synTel'Yd NOTES: 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS CALCULATED BASED ON CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019. 2. COBALT (Co), IRON (Fe), AND MANGANESE (Min) CONCENTRATIONS ARE IN MICROGRAMS PER LITER (Ng/L) 3. -NO DATA AVAILABLE ANALYTICAL PARAMETER Co Fe Mn REPORTING UNITS Ng/L Ng/L Ng/L 15A NCAC 02L STANDARD 1` 300 50 BACKGROUND THRESHOLD VALUE (SHALLOW FLOW ZONE), 6 1,422 608 VALUE (DEEP FLOW ZONE)' 0.8 665 256 BACKGROUND THRESHOLD VALUE (BEDROCK FLOW ZONE)' 0.3 1,242 360 -- INTERIM MAXIMUM ALLOWABLE CONCENTRATIONS (IMACs) OFTHE 15A NCAC 02L STANDARD APPENDIX 1, APRIL 1, 2013. ,- BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2O11 TO DECENBER 2018 AS SUBMITTED IN JUNE 2019. FIGURE 6-12c GENERAL CROSS SECTION D-D' VARIABLE GROUP MEAN OF COBALT, IRON AND MANGANESE CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 750 700 650 600 w 550 Z Q a J500 W 450 400 100 50 E (WEST) COMPLIANCE BOUNDARY ASH BASIN 3 3_■Fit C9 C9_ Q ,�rnrn co mmCwv�vi a a a N N N N N N N N - FILLQQ aaaaaa ----- ASH ASH - GWA-245a B <50 20S I--_ _-- - -_-______________________________________________________________________________________________-__ __ ____ -____________________________________ -_____ = B 1B3s--__-__ __-__-__-_--__'-'-=__--_-`_______-________________-___-_=_=ASH - AB-215 -. _ _ PORE WATER:_=-=_-=_ -- = B 3eao__-=-_=--==--==-_ SO4 <i -_: SO4 134 ________________ _______________ TDS 36 6 _-_-_----- ____________ ACTIVE ASH BASIN ' EAST DAM fAGmm � N N N N m m m m aaaa ASH WATER ELEVATION = 634 Q _-____ _ ___ ___ ___ ___ ___ ___ ___ ___ ASH PORE WATER GWA-096 ___________ _ _ _ A& L ______________________________ SAP OLITE = zls R 8 7746.________________________________________________________________________________________________________ GWA-24D_______________________________________________________________________________________________________ SOQ 163 TDS 103 ______________________-___-____________________ ___________ -_ SD4 La SAPROLITE TDS 4os - __--_--_--_--_--_--_--_--_--_------= -----= --= --= --= --= --= ---= - = - --=== -== -_ _= = _ =____= _-_-= _-_-= _-_---_-= _-_ - TDS 172 _r __ ____ ________= _ _ _ _ __ ___ _-_ _ _ _ - _� -_ _--__-___ _-_ _-_ __-_ __-_ _-__ _-__ _-{__-_ AB-21cC AB-225 { SO4 � �SAPROLITE soa 21 €j TDS 54 — �� 1 TRANSITION ZONE AB-21D 6Tua-z46R \ / i fA-o90 AB -zoo —TRANSITION ZONE B 50 A<50 23 504 <8 / 1Soa 1Ls / TO, 1 / — / \ — \ / — \ — ✓� / — / — \ 7 / — \ — / — 7 — \ — \ / — — \ AB-22D _ 1 TDS 131 SSE 1�R Q�CK— 7 / _BEDROCK AB-218RL / / \ I / ♦ / — \ /I / \ — / \ I \ / \ \\ /I / \ / _ / \ I \ / \ / — \ /I -`r\ / / \ I B <so I / \ — �/ /I \ \ /I .BEDROCK- TDS 365 SO4 1L3 TD5 1. ae22BRL B 1948 SO4 4Z7 TDS 259 — \. i 1 //\/ t i \ l�\/ . \.i 1 //\/ l i \, 1 /�\/— \. i 1 //\/ t i \, \.l�\/— E' (EAST) 750 700 M CATAWBA N m m RIVER 000o LAKE 600 WYLIE )EL. 565'(APPROX.)550 hAB-10S B I <50 504 28 3 �\ TDS 147 - _ti 10BR B 554 SO4 468 TDS 2n B 42' 504 165 TDS s51 100 \NOTES: \ 7 / \ I 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS / CALCULATED BASED ON CENTRAL TENDENCY OF DATASET USING DATA LEGEND RANGING FROM JANUARY 2018 TO JUNE 2019. GWA-22S WELL IN FILL/ALLUVIUM/SAPROLITE � ASH PORE WATER FLOW LAYER 2. BORON (B) CONCENTRATIONS ARE IN MICROGRAMS PER LITER (pg/L) GWA-22D WELL IN TRANSITION ZONE _ WATER LEVEL ELEVATION NOTES 3. SULFATE (SO4) AND TOTAL DISSOLVED SOLIDS (TDS) CONCENTRATIONS ARE IN MILLIGRAMS PER LITER (mg/L) GWA-21B WELL IN BEDROCK SHALLOW ZONE FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION 3. -NO DATA AVAILABLE STATION AB-35S WELL IN ASH PORE WATER DEEP ZONE FLOW LAYER GROUNDWATER 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, REFERENCED TO NORTH AMERICAN VERTICAL DATUM (NAVD) OF 1988. ANALYTICAL PARAMETER B SgTDS ABANDONED WELL/ GWA-5BR GEOTECHNICAL BORING WELL WATER LEVEL ELEVATION 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE REPORTING UNITS pg/L m/ L mg/L 15A NCAC 02L STANDARD 700 250 500 LLEN ROAD BEDROCK FLOW LAYER GROUNDWATER ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS BACKGROUND THRESHOLD RETIRED ASH BASIN AL34 WATER SUPPLY WELL - (DEPTH UNKNOWN) WELL WATER LEVEL ELEVATION CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY VALUE (SHALLOW FLOW ZONE)' 50 5 154 DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT (ASH STORAGE/ STRUCTURAL RETIRED GENERALIZED WATER TABLE AB-221) B 2010 MEAN BORON (B) CONCENTRATION (Ng/L) MEAN SULFATE (SO4) CONCENTRATION (mg/L) THE SITE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE BACKGROUND THRESHOLD 50 15 173 VALUE (DEEP FLOW ZONE)' FILL) ASH BASIN ASH LANDFILL GENERALIZED GROUNDWATER Sa TDS 379 �4 MEAN TOTAL DISSOLVED SOLIDS (TDS) CONCEPTUAL ONLY. BACKGROUND THRESHOLD VALUE (BEDROCK FLOW ZONE)' 50 7 221 FLOW DIRECTION CONCENTRATION (mg/L) 3. ALL BOUNDARIES ARE APPROXIMATE. ' _ BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA - CATAWBA -► GENERALIZED ASH PORE WATER FLOW DIRECTION WELL SCREEN � 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019. RIVER (LAKE WYLIE) 0 ASH n BREAKLINE GRAPHIC SCALE FIGURE 6-13a E' ACTIVE ASH BASIN IS= ASH PORE WATER o ALLUVIUM ----- COMPLIANCE BOUNDARYGENERAL DUKE 40) 0 100 200 400 CROSS SECTION E-E' ENERGY VERTICAL SCALE: 1" = 80' VERTICAL CONSERVATIVE GROUP ® FILL 0 SAPROLITE CAROLINAS 5X VERTICAL EXAGGERATION MEAN OF BORON, SULFATE AND TOTAL NOTE: ® TRANSITION ZONE DRAWN BY: J. CHASTAIN DATE:7/26/2019 REVISED BY: D. KREFSKI DATE: 3/5/2020 DISSOLVED SOLIDS TDS RIN OSS SECTION CROSS SECTIONSLON THE LOCATIONS NOT ALONG THE CROSS SECTION ARE ��„��i� BEDROCK CHECKED BY: L.DRAGO DATE: 3/5/2020 APPROVED BY: L. DRAGO DATE: 3/5/2020 CORRECTIVE ACTION PLAN UPDATE PROJECTED ONTO THE CROSS SECTION. SURFACE WATER PROJECT MANAGER: C. SUTTELL ALLEN STEAM STATION LAYOUT: XSECTEE (6-13A) synTerra WWW.synterracorp.com BELMONT, NORTH CAROLINA CROSS SECTION LOCATION Rev. 1 23 April 2020 PREDOMINANT BEDROCK FRACTURE ORIENTATION 750- E E 750 (WEST) COMPLIANCE BOUNDARY (EAST) ACTIVE ASH U) 04 __ I c� BASIN 700 ASH BASIN -700 EAST DAM COD _j U) 9 CPMl C14 N (7 2. CVI ly 9 FILL7<M M co N co m co m 'm m I. 650- OOU �,—ASH ASH— -650 - - ------ - ----------- V _��! 11 �� ASH WATER ELEVATION 634 — - — -- -------------------- ------------------------------- - - -------------------------------------- - - - ---- ----------------------------------------------- ----- -------- ASH PORE WATER.------- - -------------------- ---- -- -- ------- ---------------- --------------------- -------- ------------------- - - -- ------ --------- ------------------ -------------------------------- --- -205 -------------------- — -------------------- ------------------- --------------------- AB ------------------ - -------------------------- - CATAWBA m sr 1734 ------------------ — -------- -------- ----- ------ RIVER ------------------------ — - ------- ��Q CD 600- 1 GWA-095 ----------------------- - -------- ASH PORE- --------------- ffi - SAPROLITE (LAKE -600 CD WYLIE) - Sr 1898 ----------- --------------- - - ---------------------- ----- < EL. 565' ----------------- ------------ - - - -----------(APPROX. SAPROLITE----------------------------------------------------------- ---------------- ------------------------------------ ----- AB-21SS 550- SAPROLITEAB-2zsF Sr 220 -550 sr 0 GWA-24BR TRANSITION ZONE SAPROLITE S, 1 110 gii16 T7 TRANSITION ZONE > AB-21b_ 500 Lu 500- _j Lu , k�\ 4 -WED ABIO�D 201 'SEffR?C'K 7 I x -450450- '7 7BEDRdck L�_Sr2g�4 z BEDROCK 400- 400 7- IL 0/,, /0 A '4N 3501 1 \1 T 350 Z z �1 A - I -A/ I 150- V,—_150 100- -100 NOTES: 1 ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS 50 CALCULATED BASED ON CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019. LEGEND 2. STRONTIUM (Sr) CONCENTRATIONS ARE IN MICROGRAMS PER LITER WELL IN FILL/ALLUVIUM/SAPROLITE ASH PORE WATER FLOW LAYER NOTES (pg/L) WELL IN TRANSITION ZONE WATER LEVEL ELEVATION 3. -NO DATA AVAILABLE CAN SHALLOW ZONE FLOW LAYER GROUNDWATER 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13,2019, REFERENCED TO ANALYTICAL PARAMETER Sr ALLEN WELL IN BEDROCK WELL WATER LEVEL ELEVATION NORTH AMERICAN VERTICAL DATUM (NAVD) OF 1988. REPORTING UNITS pg/L— STEAM WELL IN ASH PORE WATER DEEP ZONE FLOW LAYER GROUNDWATER 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE 15A NCAC 02L STANDARD NE STATION ABANDONED WELL/ WELL WATER LEVEL ELEVATION ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS BACKGROUND THRESHOLD GEOTECHNICAL BORING CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY 300 _ P LUEN ROAD V BEDROCK FLOW LAYER GROUNDWATER DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS VALUE (SHALLOW FLOW ZONE)' FA L3 4] WATER SUPPLY WELL - WELL WATER LEVEL ELEVATION AT THE SITE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE BACKGROUND THRESHOLD RETIRED (DEPTH UNKNOWN) ATTHIS SCALE.IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE VALUE (DEEP FLOW ZONEy 240 ASH BASIN MEAN STRONTIUM (Sr) CONCENTRATION (pg/L) CONCEPTUAL ONLY. RAY STRUCTURAL (A HSTQ E/ GENERALIZED WATER TABLE BACKGROUND THRESHOLD T RU T S URALFILL) 181 RETIRED ASH BASIN GENERALIZED GROUNDWATER WELL SCREEN 3. ALL BOUNDARIES ARE APPROXIMATE. VALUE (BEDROCK FLOW ZONE ASH LANDFILL FLOW DIRECTION 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. - BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA GENERALIZED ASH PORE WATER BREAKLINE FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2011 FLOW DIRECTION TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019. CATAWBA RIVER 0 ASH COMPLIANCE BOUNDARY (LAKEWYLIE) GRAPHIC SCALE ASH PORE WATER 0 100 200 400 mmm� E E' DUKE FIGURE 6-13b PR z ACTIVE ALLUVIUM HORIZONTAL SCALE: 1" = 400' GENERAL CROSS SECTION E-E' ASH BASIN '44PENERGY VERTICAL SCALE: 1"= 80' FILL 5X VERTICAL EXAGGERATION NON -CONSERVATIVE GROUP SAPROLITE CAROLINAS DRAWN BY: J. CHASTAIN DATE: 7/26/2019 MEAN OF STRONTIUM TRANSITION ZONE REVISED BY: D ' KREFSKI DATE: 3/5/2020 NOTE: CHECKED BY: L.DRAGO DATE: 3/5/2020 CORRECTIVE ACTION PLAN UPDATE CROSS SECTION E-E'IS LINEAR IN NATURE AND ALL 0 BEDROCK APPROVED BY: L. DRAGO DATE: 3/5/2020 LOCATIONS NOT ALONG THE CROSS SECTION ARE PROJECT MANAGER: C. SUTTELL ALLEN STEAM STATION PROJECTED ONTO THE CROSS SECTION. SURFACE WATER LAYOUT: XSECTEE (6-i3B) BELMONT, NORTH CAROLINA CROSS SECTION LOCATION PREDOMINANT BEDROCK synTerra FRACTURE ORIENTATION i www.synterracorp.com Rev. 1 23 April 2020 750 E - — E750 (WEST) COMPLIANCE BOUNDARY (EAST) m i ACTIVE ASH NQa BASINASH BASIN 700 N i 7009 EAST DAM i C7 C9 t9 Q rn C to aaa NN NNNNNN NNNN FILLQQ mmmmmm mmmm 650 a �a a �a a a a a a 650 ASH ASH `� ASH - __ - -__ WATER ELEVATION = 634 --------------------------------------- -- _--_--_- 13--- ________. AB-20s _________________________________________ _____________________________________:_______ __ AB-215__________________________________________________________ ___ ____ __ ___ ___ �__ =__ �_ _-____-_= ASH PORE WATER :_=__= =_=__=_=_=_=_=_=_=_=_=_=_=_=_=_=_=_=_=_=_=_=_== -==-=_=_=_=_=_ Co a4=-__& co a3 -_-_ ___------------------ _ co 1 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ -------------- Fe Fe 193 - 475 ___________ _ _________________ 'Y ____ _____ = __________ Fe 9464 :___ _______ _ _____________________________________________________ ___ ___ ___ ___ CATAWBA Mn Fs '= _-- -__ _ _ _ -= _-=_ --=--= --=--= --=--= --=--= --=--= --=--= --=--= --=--= --=--= --=--= --=---=---=---= --=--= ---_===_=�=__=�=__=�=__==-= _- _ _ - (A G m m RIVER _ __ ____ ___ ___ ____________________ O O O O 600 _ __ ___ _________________________-_ ____-__-__-__________________ ___________________________===ASH PORE WATER==_=_=_=___-_= 600 SAPROLITE GwA-oss--=--=--=---- _-_ --=--------------------------------_-_�==_=�=_=�=_=�_-_�=_-_�=_-_=-=_-=_- FILL � � � � (LAKE ____ _ -- _- AB-2LSL --___ GWA-z4D co zl__________________________-___-__________________________________________-------__-___-___-___-___-___= m m m m ) ________________________________________________________________________________________= Q Q Q Q EL. 565 ________________________________________ Fe sos-_=SAPROLITE_-_-�_________________________________________-_____________-�__-_�____ ==-_� ____-�_= APPROX. Fe244 Mn 324 ______________________________________________ _______________________________ __ ( ) _____________ AB-225 v 550an 4, 1, --- — ---- 1 LLL ____T ------ Co <0.1 AB-2155----__- Co 3L7 Co S'9 550 Fe 54 Co 0.6 �� Fe 96 Z _ _ Mn s Fe Sn SAPROLITE Fe 16�5 O / \ / \ I / I \ /_ / \ Mn 114 Mn 1146 Mn 772 SAPROLITE Q / \ 1 TRANSITION ZONE > / i AB-21D TRANSITION ZONE Lu 500 GWA-24BR GWA 09BR 6WA-090 — _ \ / \ / — _ \ ' \ / — _ \ \ — Co 500 J co a3 Co 0.1 :WA-:— \I / Fe W Fe 70D Fe A Fe 1 / 1 / / / ` / Mn 32 Mn 19 Mn / \ / — \ — 1 / — \ — J / — \ — 1 / / Mn AB-10 � � \ / I / \ — yy � / AB-21 co a1 \ \ �'BE�RQQCK / \ / \ / \ \ \ \ / \ / — i . I \ / \ / \ \ /I \ / \ / \ /I / Fe \ / \ — \ \ / \ \ \ / \ _ \ /I \ / \1 \ /I \ / Mn / \ 450 450 \\/�'//1/ \�/\I/1 ��/1 /\I \ y/\ \/�\/\ /1 /\I \\/\ /\ AB2zeR �• / BEDROCK / C / 1 / i Mn 1 / / \\�� / 1 / 1 / \ �— \ — 1 /—J( /\-- \ — I /\-- \ — \ /\-- \ — 1 / /\-- \ — 1 / /y co a3 /I/\/il\/I/\li \/I/y/i/\/I/\/i \/I/l\/ Ali \ l\/li\l��\/I/r\/li1/i \/I/\\ Fe 441 n D.3 \ / / — \ \ / — _ \ \ / �\ ♦ \ / — _ \ / \ / — ♦ \ / ♦ _ `, ♦ .BEDROCK_ \ \ / Mn 9v A&21BRL \ / — /Y I \ \ \- / Cn \ /\ Mn 3s \ / 1 / 1 400 �-� /- \ /- "\ \-\ / �-1 -\--\ /- /( -1 /- �-1 \mil/- -1 \�\ I _ - 400 Mn Is \ / _ \ / Co 14 co a1 _ .l /` / - \ i ` l /\/ i i - \ l /` i - \ . i 1 / /\/ i. i - 1 / /` i - \ . i ` l / Mn I 7D 150 \ 1 2 \ \ / I , \ I / \ \ / I , \ I \ \ / I \ . V I ; \ / \ i \ / — _ \ \ / \ i 150 \ / ,�\/� \ \ \— 100 " 100 / / / / / NOTES: 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS OR GEOMEANS 50 CALCULATED BASED ON CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019. NOTE: CROSS SECTION E-E' IS LINEAR IN NATURE AND ALL LOCATIONS NOT ALONG THE CROSS SECTION ARE PROJECTED ONTO THE CROSS SECTION. CROSS SECTION LOCATION LEGEND GWA-22S WELL IN FI LL/ALLUVI U M/SAPRO LITE GWA-22D WELL IN TRANSITION ZONE GWA-21 WELL IN BEDROCK AB-35S WELL IN ASH PORE WATER GWA-5BR ABANDONED WELL/ GEOTECHNICAL BORING AL34 WATER SUPPLY WELL - (DEPTH UNKNOWN) GENERALIZED WATER TABLE own.,*, GENERALIZED GROUNDWATER FLOW DIRECTION ommo, GENERALIZED ASH PORE WATER FLOW DIRECTION 0 ASH 0 ASH PORE WATER ALLUVIUM ® FILL 0 SAPROLITE ® TRANSITION ZONE BEDROCK O SURFACE WATER --�-- PREDOMINANT BEDROCK FRACTURE ORIENTATION ASH PORE WATER FLOW LAYER WATER LEVEL ELEVATION SHALLOW ZONE FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION DEEP ZONE FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION BEDROCK FLOW LAYER GROUNDWATER WELL WATER LEVEL ELEVATION A410BRL MEAN COBALT (CO) CONCENTRATION (ug/L) MEAN IRON (Fe) CENTRATION (pg/L) IMn) MEAN MANGANESE CONCENTRATION (pg/L) WELL SCREEN BREAKLINE ----- COMPLIANCE BOUNDARY NOTES 1. DEPTH TO WATER GAUGED IN MONITORING WELLS ON MARCH 13, 2019, REFERENCED TO NORTH AMERICAN VERTICAL DATUM (NAVD) OF 1988. 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTS THE GENERALIZED FRACTURE ORIENTATIONS BASED ON TELEVIEWER LOGGING AT SITE SPECIFIC BOREHOLES. AS CONCEPTUALLY ILLUSTRATED HERE, TELEVIEWER LOGGING RESULTS DID NOT INDICATE ANY DISTINCT, CONSISTENT FRACTURE SETS, BUT A WIDE VARIETY OF FRACTURE ORIENTATIONS AT THE SITE. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO ILLUSTRATE AT TH SCALE. IN ADDITION, THE DEPTH AND LENGTH OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY. 3. ALL BOUNDARIES ARE APPROXIMATE. 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS. 40) DUKE ENERGY CAROLINAS 141 synTena GRAPHIC SCALE 0 100 200 400 HORIZONTAL SCALE: 1" = 400' VERTICAL SCALE: 1" = 80' 5X VERTICAL EXAGGERATION DRAWN BY: J. CHASTAIN DATE: 7/26/2019 REVISED BY: D. KREFSKI DATE: 3/5/2020 CHECKED BY: L.DRAGO DATE: 3/5/2020 APPROVED BY: L. DRAGO DATE: 3/5/2020 PROJECT MANAGER: C. SUTTELL LAYOUT: XSECTEE(6-13C) www.synterracorp.com 2. COBALT (Co), IRON (Fe), AND MANGANESE (Mn) CONCENTRATIONS ARE IN MICROGRAMS PER LITER (Pg/L) 3. - NO DATA AVAILABLE ANALYTICAL PARAMETER Co Fe Mn REPORTING UNITS Pg/L Pg/L Pg/L 15A NCAC 02L STANDARD 1* 300 50 BACKGROUND THRESHOLD VALUE (SHALLOW FLOW ZONE)' 6 1,422 608 BACKGROUND THRESHOLD VALUE (DEEP FLOW ZONE)' 0.8 665 256 BACKGROUND THRESHOLD VALUE (BEDROCK FLOW ZONE)' 0.3 1,242 360 * - INTERIM MAXIMUM ALLOWABLE CONCENTRATIONS (IMACs) OF THE 15A NCAC 02L STANDARD APPENDIX 1, APRIL 1, 2013. '-BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED MARCH 2O11 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019. FIGURE 6-13c GENERAL CROSS SECTION E-E' VARIABLE GROUP MEAN OF COBALT, IRON AND MANGANESE CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 40 690 -s80s , ALLEN STATION WATER STEAM INTAKE STRUCTURE STATION hL 1 ■ LIVE COAL PILE HOLDING BASIN Q -600 ■ LL C U _ r ASH y - a STORAGE PROXIMATE RETIRED OL OGIC DIVIDE ASH BASIN RE ILA: 1., r- 6q0. o r lie + +lie TIRED ASH BASIN 9SH LANDFILL PRIMARY PRIMARY - POND 2 POND 3 PRIMARY � POND 1 - a 64� ACTIVE ASH BASIN i r .^.`6ga�4-� *.♦ r ('DUKE 1 , tit ENERGY 66 w ♦,. , �. o70 CAROLINAS �JTT r } ■ . syn LEGEND NOTES: 425 ° 425 850 GRAPHIC SCALE IN FEET FIGURE 6-20a ISOCONCENTRATION MAP SULFATE IN SHALLOW FLOW ZONE DRAWN BY: C. DAVIS DATE: 06/12/2019 REVISED BY: DATE02/28/2020 DATE::02/28/2020 CORRECTIVE ACTION PLAN UPDATE APPROVEDED BY:: L.L. DRAGO DATE: 02/28/2020 ALLEN STEAM STATION CHECKED BY: L. DRAGO PROGRAM MANAGER: C. SUTTELL BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 ram\ S90 630 610 650 ref J J LL J U Fn ASH STORAGE ti 13 0 ALLEN STEAM STATION WATER STATION - INTAKE STRUCTURE ■ I . -.w------ PRIMARY PRIMARY POND 2 POND 3 (' DUKE ENERGY 425 0 425 850 GRAPHIC SCALE IN FEET CAROLINAS DRAWN BY: C. DAVIS DATE: 06/12/201; li REVISED BY: J. KIRTZ DATE: 02/28/2020 APPROVED BY: L. DRAGO DATE: 02/28/2020 DATE: 02/28/2020 CHECKED BY: L. DRAGO synTerra PROGRAM MANAGER: C. SLITTELL www.r,nterracor .com LEGEND NOTES: FIGURE 6-20b ISOCONCENTRATION MAP SULFATE IN DEEP FLOW ZONE CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 mg UE 600 MIMI /Aw"" --_: ■l ,.A0 r PRIMARY PRIMARY POND 2 POND 1 ALLEN STEAM STATION STATION WATER INTAKE STRUCTURE LIVE coal PILE PRIMARY POND 3 —640 kw 'I + '7 t J o"o SRO (' DUKE ENERGY CAROLINAS 425 0 425 850 GRAPHIC SCALE IN FEET DRAWN BY: C. DAVIS DATE: 06/12/2019 REVISED BY: J. KIRTZ DATE: 02/28/2020 DATE: 02/28/2020 APPROVED BY: L. DRAGO DATE: 02/28/2020 CHECKED BY: PROGRAM MANAGER: L. DRAGO C. SUTTELL LEGEND NOTES: FIGURE 6-20c ISOCONCENTRATION MAP SULFATE IN BEDROCK FLOW ZONE CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 690 �� I _ 640 _ 1 1 Ia r O;LO is 67 • 1l /� •. rl ® .. y �. •. '/� �� ' a u ._• 650 rZ • 64 s'90 u 660 •� �a r yo - I 1 1� ff '♦ .� - - 600 s�o DUKE azs o azs sso ENERGY GRAPHIC SCALE IN FEET CAROLINAS DRAWN BY: C. DAVIS REVISED BY: J. KIRTZ DATE: 06/12/2019 DATE: 03/02/2020 DATE: 03/02/2020 141, APPROVED BY: L. DRAGO DATE: 03/02/2020 CHECKED BY: L. DRAGO S) TLMM PROGRAM MANAGER: C. SUTTELL C www.synterracoro.com LEGEND NOTE FIGURE 6-21a ISOCONCENTRATION MAP TOTAL DISSOLVED SOLIDS IN SHALLOW FLOW ZONE CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 690 I r 630 6�0 .-ram r �—r r STEAM STATION T, F . ti r ► zd)v + n 00 ra C3�Ii7 1, r Y � wo ` i � r /// • f bop S I �/ i -=ter r►y 7o ..j VAL '90� • `52� + L. DUKE ENERGY CAROLINAS LEGEND N NOTE 425 0 425 850 FIGURE 6-21c GRAPHIC SCALE IN FEET ISOCONCENTRATION MAP DRAWN BY: C.DAVIS DATE:OG/12/2019 TOTAL DISSOLVED SOLIDS REVISED BY:J. KIRTZ DATE: 03/02/2020 IN BEDROCK FLOW ZONE APPROVED BY: L. DRAGO DATE: 03/02/2020 CORRECTIVE ACTION L DATE: 03/02/2020 CHECKED BY: L. DRAGO ALLEN STEAM STATION PROGRAM MANAGER: C.SCTTELL BELMONT, NORTH CAROLINA WW sVf1YP,rracorn.com Rev. 1 23 April 2020 690 ■ � I ■ ■ ■ F N 660 ;I 660 • �t .. wrr r . ,•� .. �.. 60p�r... �620� . w I ALLEN STATION WATER STEAM INTAKE STRUCTURE STATION i LIVE ■ COAL PILE COAL HOLDING PILE BASIN RETIRED ASH BASIN � ASH LANDFILL r CA PRIMARY PRIMARY (L POND 2 POND 3 (' DUKE azs o azs sso ENERGY GRAPHIC SCALE IN FEET CAROLINAS DRAWN BY: C. DAVIS REVISED BY: J. KIRTZ DATE: 06/12/2019 DATE: 03/02/2020 DATE: 03/02/2020 APPROVED BY: L. DRAGO DATE: 03/02/2020 CHECKED BY: L. DRAGO PROGRAM MANAGER: C. SUTTELL www.synterracoro.com LEGEND NOTES: FIGURE 6-22a ISOCONCENTRATION MAP STRONTIUM IN SHALLOW FLOW ZONE CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 r� 0 " 0,70 COAL HOLDING PILE BASIN (' DUKE ENERGY CAROLINAS LEGEND NOTES: 425 0 425 850 GRAPHIC SCALE IN FEET FIGURE 6-23a ISOCONCENTRATION MAP COBALT IN SHALLOW FLOW ZONE DRAWN BY: C. DAVIS DATE: 06/12/2019 REVISED BY: DATE: 02/28/2020 CORRECTIVE ACTION PLAN UPDATE APPROVEDED BY:: L.L. DRAGO DATE: 02/28/2020 DATE: 02/28/2020 ALLEN STEAM STATION CHECKED BY: L. DRAGO PROGRAM MANAGER: C. SL17ELL BELMONT, NORTH CAROLINA www.synterracor[).com Rev. 1 23 April 2020 . � r ,-.ram ❑ y - 4� •' o 0 f 4190 630 °10 ►- ASH BASIN APPROXIMATE .� HYDROLOGIC DIVIDE ❑ r � � ❑ASH STORAGE RETIRED - ��`n LEGEND 0 �! a _ i • RETIRED ASH BASIN ASH LANDFILL (�,, PRIMARY POND 3 7CTIVE tH BASIN - 1 - P�wd 660 i r \ or r 0� O oo o ° o r ItDUKE ENERGY CAROLINAS syn NOTES: FIGURE 6-23b GRAPHIC SCALE IN FEET ISOCONCENTRATION MAP DRAWN BY: C. DAVIS DATE: 06/12/2019 COBALT IN DEEP FLOW ZONE REVISEDDAVIS DATE:03/24/2020 CORRECTIVE ACTION PLAN UPDATE APPROVEDED BY: L. DRAGO DATE: 03/24/2020 CHECKED BY: L. DRAGO DATE: C3/24/2020 ALLEN STEAM STATION PROGRAM MANAGER: 0. SUTTELL BELMONT, NORTH CAROLINA -w vnferracorn.com Rev. 1 23 April 2020 690 + 630� _0.�J j20ti�-�� r ASH P' STORAGE J rNMIM J LL J J Q J_ U J Q ASH RETIRED ASH IASI STORAGE h ASH LANDFILL i tj 660 PRIMARY POND 2 PRIMARY POND 1 640 lb LEGEND 1 n 1 �gEm NOTES: ■ 680 • \ 425 0 425 850 69, •.o DUKE FIGURE 6-23c ■ , r r ;� %' �' ENERGY GRAPHIC SCALE IN FEET ISOCONCENTRATION MAP �- •� �. �,r l �i CAROLINAS DRAWN BY: C.DAVIS DATE:06/12/2019 COBALT IN BEDROCK FLOW ZONE `��-``�--+-+r•��'w _ J REVISED BY: J. KIRTZ DATE: 02/27/2020 CORRECTIVE ACTION PLAN UPDATE 620_.. APPROVED BY: L. DRAGO DATE: 02/27/2020 4y CHECKED BY: L.DRAGO ALLEN STEAM STATION 630 synTerra PROGRAM MANAGER: C. SUTTELL BELMONT, NORTH CAROLINA www.s nterracor .com Rev. 1 23 April 2020 r ' I BG 4BR 5 �.. soo 11 r al l Jf� la r r . r • r • ;GWA-6B - - _ BG2 ' �" � ■�-. � soar.. -26RA'... (� GWA-6BF 67 AB-38BR 74 syo ' �■ y 1 1 4�777 STORAGE AB-35 B R AB-14BR / 6"0 F GWA-21BR 149AB-4BR Y 213 GWA-9BR .J 19 !AH J r r B G■-1 B R PRIMARY POND 2 PRIMARY POND 1 �. P-6BR 00 C � 14 GWA-5D 147 GWA-5B RA --- ----c— o � 87 l ! GWA-5BRL g +j 24 GWA-4BR ' 53 GWA-4BRL 38 AB-27BR 192 j I AB-25BR GWA-36RA 1 <5 NA GWA-3BRL �. 5 CCR-16BR <5 ► � CCR-16D NA CCR-17D NA AB-10BR AB-22BRL 35 9 AB-22BR AB-10BRL 99 70 1 �J GWA-1BR ♦� j 33 "■� r w ► ■ DUKE ENERGY CAROLINAS syn LEGEND ASSESSMENT MONITORING WELL BACKGROUND MONITORING WELL ISOLATED EXCEEDANCE OF BACKGROUND --- MANGANESE - INFERRED BACKGROUND CONTOUR ACTIVE ASH BASIN WASTE BOUNDARY - — - — ASH BASIN COMPLIANCE BOUNDARY RETIRED ASH BASIN WASTE BOUNDARY RETIRED ASH BASIN ASH LANDFILL WASTE BOUNDARY RETIRED ASH BASIN ASH LANDFILL COMPLIANCE BOUNDARY DORS FILLS BOUNDARIES - - — DUKE ENERGY CAROLINAS PROPERTY LINE TOPOGRAPHIC CONTOUR (10' INTERVAL) STREAM (AMEC NRTR 2015) WETLAND (AMEC NRTR 2015) APPROXIMATE HYDROLOGIC DIVIDE -*-GROUNDWATER FLOW DIRECTION -----*-SURFACE WATER FLOW DIRECTION NOTES 1. DATA INCLUDED IN THIS FIGURE ARE THE MEAN OR GEOMEAN RESULTS FOR WELLS BASED ON THE CENTRAL TENDENCY OF THE DATA SET FROM SAMPLES BETWEEN JANUARY 2018 AND JUNE 2019. FOR WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE MOST RECENT VALID SAMPLE DATA WAS USED. 2. THE 02L FOR MANGANESE IS 50 pg/L. 3THE BACKGROUND VALUE FOR MANGANESE IS 360 pg/L (AS SUBMITTTED JUNE 2619). 4. NA - NOT AVAILABLE. 5. HYDROLOGIC DIVIDE IDENTIFIED IN CSA UPDATE (SYNTERRA, 2018) AND UPDATED GROUNDWATER FLOW AND TRANSPORT MODELING REPORT (MURDOCH AND OTHERS, 2019). 6. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND DELINEATION CONDUCTED BY AMEC FOSTER WHEELER ENVIRONMENTAL & INFRASTRUCTURE, INC. NATURAL RESOURCE TECHNICAL REPORT (NRTR) FOR ALLEN STEAM STATION DATED MAY 29, 2015. 7. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLY AND SHOULD NOT BE USED FOR DESIGN OR ENGINEERING PURPOSES. TOPOGRAPHY IS BASED ON LIDAR BARE EARTH DATA OBTAINED FROM THE NORTH CAROLINA SPATIAL DATA SITE AT https://sdd.nc.gov/sdd/DataDownload.aspx. 8. ALL BOUNDARIES ARE APPROXIMATE 9. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS. 10. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON OCTOBER 11, 2017. AERIAL WAS COLLECTED ON OCTOBER 8, 2016. 11. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE COORDINATE SYSTEM RIPS 3200 (NAD83). FIGURE 6-25c 5 GRAPHIC SCALE IN FEET850 ISOCONCENTRATION MAP DRAWN BY: C. DAVIS DATE: 06/12/2019 MANGANESE IN BEDROCK FLOW ZONE REVISEDBY:BY: KIRTZL. DATE' 02/27/2020 CORRECTIVE ACTION PLAN UPDATE APPROVED BY: L. DRAGO DATE: 02/27/2020 CHECKED BY: L. DRAGO DATE: 02/27/2020 ALLEN STEAM STATION PROGRAM MANAGER: C.SnTYE'rnY„rnm BELMONT, NORTH CAROLINA Rev. 1 23 April 2020 TABLES TABLE 4-3 BACKGROUND VALUES FOR GROUNDWATER CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Constituent Reporting Unit 15A NCAC 02L Standard 2018 Background Threshold Values' 2019 Updated Background Threshold Values2 piedmont Background Threshold Value Range a Shallow Flow Zone Deep Flow Zone Bedrock Flow Zone Shallow Flow Zone Deep Flow Zone Bedrock Flow Zone pH S.U. 6.5 - 8.5 4.4 - 7.4 6.2 - 7.5 7.2 - 8.4 4.5 - 7.8 6.1 - 8.5 6.6 - 9.0 3.6 - 9 Alkalinity mg-CaCO3/L NE 105 77 116 105 134 138 19 - 379 Aluminum pg/L NE 534 304 301 1,238 540 736 100 - 1,238 Antimony pg/L 1* 0.8 0.5 0.5 1 1 3 0.5 - 2.9 Arsenic pg/L 10 0.6 1 2 1 1 2 0.2 - 6.35 Barium pg/L 700 105 132 21 87 103 25 10.52 - 840 Beryllium pg/L 4* 0.1 0.03 0.1 0.1 1 0.1 0.0625 - 1 Bicarbonate mg-CaCO3/L NE 105 77 116 106 125 136 19 - 388 Boron pg/L 700 50 50 50 50 50 50 50 - 176.8 Cadmium pg/L 2 1 1 0.08 0.08 1 0.08 0.08- 1 Calcium mg/L NE 20 17 25 21 31 28 4- 111 Carbonate mg-CaCO3/L NE 5 5 5 5 5 5 5- 10 Chloride mg/L 250 5 5 5 11 5 9 3.34 - 250 Chromium pg/L 10 7 7 9 9 16 10 1 - 26 Chromium (VI) pg/L 10 2 1 0.7 2 2 0.8 0.03 - 12 Cobalt pg/L 1* 2 0.5 0.3 6 0.8 0.3 0.088 - 88.85 Copper pg/L 1,000 3 3 2 3 2 2 0.5 - 17.15 Fluoride mg/L 2 --- --- --- 0.1 0.1 0.1 0.1 - 1.8 Iron pg/L 300 884 356 284 1,422 665 1,242 56.3 - 37,500 Lead pg/L 15 0.2 0.1 0.2 1 0.2 0.1 0 - 2 Lithium pg/L NE --- --- --- 3 25 26 2 - 95.39 Magnesium mg/L NE 6 5 8 6 7 8 1- 45 Manganese pg/L 50 225 26 278 608 256 360 7-9,170 Mercury pg/L 1 0.2 0.2 0.2 0.2 0.2 0.1 0.05 - 0.5 Methane pg/L NE 12 10 90 15 125 10 1 - 2,505 Molybdenum pg/L NE 0.8 2 9 7 26 11 0.5 - 26.2 Nickel pg/L 100 6 5 5 9 10 7 0.87 - 48 Nitrate + Nitrite mg-N/L NE 0.8 1 2 3 3 3 0.02 - 6.3 Potassium mg/L NE 6 5 8 5 10 19 1.609 - 18.8 Selenium pg/L 20 0.5 0.6 0.5 0.5 0.8 0.5 0.5 - 2.4 Sodium mg/L NE 21 12 12 21 24 15 6- 190 Strontium pg/L NE 298 232 181 300 240 181 27 - 2,120 Sulfate mg/L 250 2 5 7 5 15 7 1.2 - 510 Sulfide mg/L NE 0.1 0.1 0.1 0.1 0.1 0.1 0.1 - 2 TDS mg/L 500 163 158 165 154 173 221 50-1,200 Thallium pg/L 0.2* 0.1 0.1 0.1 0.1 0.1 0.1 0.1 - 0.2 TOC mg/L NE 1 1 6 12 11 2 1 - 12.3 Total Radium pCi/L 5^ 1 1 1 2 2 1 0.494 - 35 Total Uranium pg/mL 0.03A 0.0005 0.0005 0.0009 0.0005 0.0005 0.0009 0.0002 - 0.864 Vanadium pg/L 0.3* 6 12 16 4 16 13 0.33 - 25.8 Zinc pg/L 1,000 45 10 15 45 15 13 5 - 140 Prepared by: LWD Checked by: ]YT Notes: 2018 background threshold values (BTVs) approved by North Carolina Department of Environmental Quality (NCDEQ) on May 14, 2018. 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 June 2015 to September 2017. c - Updated BTVs were calculated using data from background groundwater samples collected March 2011 to December 2018. - 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 Station4, Cape Fear Steam Electric Plant°, Cliffside Steam Stations, Dan River Steam Station4, Marshall Steam Stations, Mayo Steam Electric Plants, Riverbend Steam Station4, and Roxboro Steam Electric Plants). --- - 2018 BTV was not calculated for constituent. * - IMAC of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. ^ - Federal Maximum Contaminant Level (MCL) pg/L - micrograms per liter pg/mL - micrograms per milliliter mg/L - milligrams per liter mg-CaCO,/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 Rev. 1 Page 1 of 1 23 April 2020 TABLE 6-5 MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019 AND OCTOBER 2019 CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY, CAROLINAS, LLC, BELMONT, NC Analytical Parameters Antimony Arsenic Beryllium Boron m (VI) Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Dissolved Solids Vanadium Reporting Units u9/L U9/L U9/L u9/LL U9/L u9/L u9/L u9/L u9/L U9/L u9/L u9/L U9/L mg/L u9/L m9/L u9/L 15A NCAC 02L Standard 1* 10 4* 700 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* 2018 Background Threshold Values Shallow Flow Zone)'0.8 0.6 0.1 50 M08O.013 7 2 884 NE 225 0.8 6 0.5 298 2 0.1 163 6 2019 Background Threshold Values Shallow Flow Zone)2 1 1 0.1 50 9 6 1,422 3 608 7 9 0.5 300 5 0.1 154 4 2019 Background Dataset Range Shallow Flow Zone)' 0.084 - <1 0.048 - 2.3 0.01 S1 - 0.22 4.4 - <50 - 3.2 0.11 -37.6 0.038 - 19.2 29 - 2940 0.16 - 3.6 2.8 - 1620 0.09 - 10.7 0.14 - 26.2 0.32 - <0.5 2.6 -309 <0.1 - 10.7 0.017 - <0.2 15 - <250 0.088 - 7.5 2018 Back round Threshold Values Dee Flow Zone 0.5 1 0.03 50 7 0.5 1 356 NE 26 1 2 5 0.6 232 5 1 0.1 158 12 2019 Background Threshold Values (Deep Flow Zone)' 1 1 1 50 1 2 16 665 25 256 26 10 0.8 240 15 0.1 173 16 2019Background DatasetRan a Dee Flow ZoneZ 0.096'-0.85 0.048'-1.4 0.01'-<1 5.8-50.3 0.035'-<1 0.015'-1.8 0.23'BSI-93.2 0.0 27.5'B-823 0.89-44.9 2.7'-900 0.21'-30.2 0.16'-52.6 0.34'-1.2 31-251 0.5'-22 0.016'-<0.1 43-280 1.2-17.9 2018 Background Threshold Values Bedrock Flow Zone) 0.5 2 0.1 50 0.08 0.7 9 E-O.31 284 NE 278 9 5 0.5 181 7 0.1 165 16 2019 Background Threshold Values Bedrock Flow Zone)2 3 2 0.1 50 0.08 0.8 10 1,242 26 360 11 7 0.5 181 7 0.1 221 13 2019 Background Dataset Ran a Bedrock Flow Zone)' 0.27 j - 3.9 0.24- 1.6 0.01 j - <0.1 35.6 j - <50 <0.08 <0.025 - 0.66 0.33 j - 8.9 0.02 40.7 j - 715 0.9 j - 26.3 2.8 j - 278 1.7 - 10.5 0.22 j - 5.8 0.17 j - <0.5 97.7 - 223 1.8 - 33.3 0.02 j - <0.1 104 - 222 7.5 - 15.9 Sample ID Flow Zone Means Results Background Locations° AB-12D Deep < 0.5 0.1 < 0.1 < 50 < 0.08 0.51 0.59 < 0.1 86 < 2.5 < 5 0.24 < 0.5 0.61 181 3.9 < 0.1 103 3.7 AB-12S Shallow < 0.5 < 0.1 0.06 < 50 < 0.08 0.15 0.43 0.6 265 < 2.5 49 < 0.5 < 0.5 < 0.5 < 5 < 1 < 0.1 45 0.6 BG-01BR Bedrock 0.62 1 < 0.1 37 < 0.08 0.38 1 0.1 106 < 2.5 19 8.2 0.71 < 0.5 164 5.8 < 0.1 163 8.1 BG-01DA Deep < 0.5 0.23 < 0.1 < 50 < 0.08 0.28 1.7 0.1 68 1.3 4 1.3 1.3 < 0.5 114 2.3 < 0.1 108 9.7 BG-01S Shallow < 0.5 0.19 < 0.1 < 50 < 0.08 0.33 2.3 0.1 334 < 2.5 11 < 0.5 2.3 < 0.5 30 < 1 < 0.1 36 0.84 BG-02BRA-2 Bedrock 2.1 1.3 < 0.1 < 50 < 0.08 0.99 1.5 0.1 71 37.4 5 7.9 0.88 < 0.5 218 19.8 < 0.1 187 10.8 BG-02D Deep < 0.5 0.22 < 0.1 < 50 < 0.08 0.98 1.3 0.1 144 10.5 7 0.92 0.55 < 0.5 180 1.1 < 0.1 116 8.4 BG-02S Shallow < 0.5 0.18 < 0.1 < 50 < 0.08 1.8 2.0 0.1 199 0.55 11 < 0.5 0.56 < 0.5 184 < 1 < 0.1 137 2.1 BG-03D Deep < 0.5 1 0.13 < 0.1 < 50 < 0.08 1 0.45 0.73 < 0.1 < 50 2.9 < 5 0.32 1 < 0.5 < 0.5 209 < 1 < 0.1 114 6.5 BG-03S Shallow < 0.5 0.16 < 0.1 < 50 < 0.08 1.3 1.7 0.1 323 2.8 17 0.22 0.86 < 0.5 263 < 1 < 0.1 135 3.3 BG-04BR Bedrock < 0.5 0.28 < 0.1 < 50 < 0.08 0.23 1.5 0.1 207 1.5 11 1.9 0.87 < 0.5 99 2.2 < 0.1 125 9.1 BG-04D Deep < 0.5 0.25 < 0.1 < 50 < 0.08 0.72 1.1 0.2 310 5 92 2.1 0.61 < 0.5 199 1.5 < 0.1 150 7 BG-04S Shallow < 0.5 0.23 < 0.1 < 50 < 0.08 0.16 1.8 0.2 249 < 2.5 34 0.32 4.6 < 0.5 289 < 1 < 0.1 141 2.4 CCR-BG-OIDA Deep 0.46 0.27 < 0.1 6 < 0.05 0.58 0.2 14.3 6.5 < 0.5 < 1 < 0.1 114 CCR-BG-01S Shallow < 0.5 < 0.1 < 0.1 6 < 0.08 1.4 1.4 0.75 < 0.5 < 0.5 1.2 < 0.1 29 GWA-16D Deep < 0.5 0.21 < 0.1 < 50 < 0.08 0.56 1.6 0.1 165 1.6 9 0.44 0.84 < 0.5 119 1 < 0.1 72 T9- GWA-16S Shallow < 0.5 0.21 < 0.1 < 50 < 0.08 0.48 1.3 0.2 228 2.4 49 3.7 2.2 < 0.5 191 0.7 < 0.1 101 1.1 GWA-19D Deep 0.33 1 0.3 < 0.1 < 50 < 0.08 0.57 0.62 < 0.1 55 39.7 < 5 1.4 < 0.5 < 0.5 191 4.2 < 0.1 153 10.5 GWA-19S Shallow < 0.5 0.29 < 0.1 < 50 < 0.08 0.79 1.4 0.2 250 < 2.5 17 0.24 1.2 < 0.5 123 < 1 < 0.1 47 0.97 GWA-21BR Bedrock 1.3 0.85 < 0.1 < 50 < 0.08 0.1 1.3 0.3 657 16.0 149 5.8 0.78 < 0.5 164 2.8 < 0.1 176 12.3 GWA-21DA Deep < 0.5 0.15 < 0.1 < 50 < 0.08 1.1 1.6 0.1 187 1.8 6 0.8 0.56 < 0.5 112 1.4 < 0.1 134 GWA-21S Shallow < 0.5 < 0.1 0.17 < 50 < 0.08 0.4 0.63 1.1 97 < 2.5 78 < 0.5 1.1 < 0.5 24 < 1 < 0.1 31 0.18 GWA-23D Deep < 0.5 0.36 < 0.1 < 50 < 0.08 0.1 < 0.5 4 63 1.5 814 7.5 < 0.5 < 0.5 84 2.2 < 0.1 134 3.9 GWA-23S Shallow < 0.5 < 0.1 < 0.1 < 50 < 0.08 0.25 2.3 0.6 95 < 2.5 23 < 0.5 2.5 < 0.5 5 0.9 < 0.1 26 < 0.3 GWA-26D Deep 0.4 0.67 < 0.1 < 50 < 0.08 0.042 0.68 0.2 185 < 2.5 230 1% 1 0.8.2 < 0.5 95 11.2 < 0.1 121 1.8 GWA-26S Shallow < 0.5 0.22 < 0.1 < 50 < 0.08 1.1 2 0.1 165 < 2.5 14 0.55 < 0.5 < 0.5 69 0.7 < 0.1 70 2.3 At or Within the Waste Boundary Locations AB-20D Deep < 0.5 0.69 < 0.1 < 50 < 0.08 1 1.1 < 0.1 54 < 2.5 < 5 3.3 < 0.5 < 0.5 130 8 < 0.1 130 10.5 AB-20S Ash Pore Water 1.2 18 < 0.1 1,836 0.085 0.17 0.99 0.29 475 161 33.8 10.1 23.4 115 1,734 134 0.26 476 6.8 AB-21BR Bedrock - - - < 50 - - - - - - - - - - - - - - - AB-21BRL Bedrock < 0.5 2 0.11 < 50 < 0.08 0.044 < 0.5 0.1 < 50 7.4 55 9.5 < 0.5 < 0.5 94 11.3 < 0.1 144 2.7 AB-21D Deep - - - < 50 - - - - - - - - - - - - - - - AB-21S Ash Pore Water 0.32 827 < 0.1 3,800 0.11 < 0.025 0.54 1 9,464 215 1,166 358 1.8 0.91 3,708 78.9 < 0.1 544 6.1 AB-21SL Ash Pore Water 3.5 494 0.053 7,746 0.28 < 0.025 < 0.5 0.54 508 282 133 2,962 3 < 0.5 1,898 131 < 0.1 405 11.5 AB-21SS Shallow 0.67 0.56 < 0.1 78 < 0.08 0.051 < 0.5 0.6 172 < 2.5 114 1.2 1.1 < 0.5 99 1.3 < 0.1 95 3.3 AB-22BR Bedrock < 0.5 0.27 < 0.1 1,834 < 0.08 1 0.065 1.5 0.3 1 441 18.0 99 2.1 3.8 < 0.5 284 26.3 < 0.1 365 1.3 AB-22BRL Bedrock < 0.5 0.27 < 0.1 1,948 < 0.08 0.043 1.7 0.2 114 2.8 9 1.5 2.8 < 0.5 349 42.7 < 0.1 259 4.3 AB-22D Deep < 0.5 0.11 < 0.1 2,010 < 0.08 0.061 1.5 0.4 445 2.3 166 0.83 3.9 < 0.5 441 37.9 < 0.1 490 5.3 AB-22S Shallow < 0.5 0.13 < 0.1 < 50 < 0.08 0.029 0.53 31.7 1,675 < 2.5 1,146 < 0.5 2.7 < 0.5 62 2.1 0.063 54 0.23 AB-23BRU Deep - - - 58 - - - - - - - - - - - - - - - AB-23S Ash Pore Water 0.95 1193 < 0.1 427 < 0.08 < 0.025 < 0.5 0.039 74.5 224 25.7 51.4 < 0.5 < 0.5 670 17.9 < 0.1 112 16.4 AB-24BR Bedrock < 0.5 0.33 < 0.1 < 50 < 0.08 0.042 < 0.5 0.1 88 1.5 85 2.1 2.1 < 0.5 103 3.6 < 0.1 97 11.4 AB-24D Deep - - - < 50 - - - - - - - - - - - - - - - AB-24S Ash Pore Water 0.94 135 < 0.1 1 773 < 0.08 0.029 0.41 1.9 3480 56.7 1 951 35.7 1 4.2 0.68 1,922 80 0.056 360 9.5 AB-24SL Ash Pore Water 0.47 691 < 0.1 1 631 < 0.08 0.03 < 0.5 < 0.1 1 95.3 128 1 37.2 57 0.56 0.51 709 18.3 < 0.1 127 2.5 AB-25BR Bedrock - - - < 50 - - - - - - - - - - - - - - - AB-25BRU Deep - - - < 50 - - - - - - - - - - - - - - - AB-25S Ash Pore Water 6.5 206 < 0.1 1,234 < 0.08 0.033 < 0.5 2 479.4 147 188 139 2.8 0.54 1364 47.9 0.14 220 28 AB-25SL Ash Pore Water 0.7 886 < 0.1 1,065 < 0.08 0.037 < 0.5 < 0.1 72.7 144 30.4 113 1.2 < 0.5 1,274 35.3 < 0.1 183 8.6 AB-25SS Shallow 0.15 0.37 < 0.1 1,213 < 0.08 0.028 0.82 1 107 1.1 314 5.0 3.1 < 0.5 237 27.2 < 0.1 152 1.2 AB-26D Deep < 0.5 0.24 < 0.1 325 < 0.08 0.33 2.2 0.3 337 9.1 100 1.3 1.9 < 0.5 225 39.8 < 0.1 183 6.2 AB-26S Shallow < 0.5 0.11 < 0.1 1,046 < 0.08 0.15 3.5 1.2 743 1.2 240 < 0.5 4.4 < 0.5 208 65.8 1 < 0.1 158 0.93 AB-27BR Bedrock < 0.5 1 0.44 < 0.1 142 < 0.08 1 0.039 0.35 0.2 79 6.1 192 1 1.8 0.72 < 0.5 166 19.9 < 0.1 203 0.72 AB-27D Deep < 0.5 2.5 < 0.1 985 < 0.08 0.061 1 0.8 1 791 1.3 161 2.8 1.1 1.4 361 74.4 < 0.1 205 3.9 AB-27S Ash Pore Water < 0.5 198 < 0.1 436 < 0.08 < 0.025 < 0.5 4.3 17,775 25 3,718 2 0.43 < 0.5 1,132 16.9 < 0.1 306 0.39 AB-28D Deep < 0.5 0.42 < 0.1 81 < 0.08 0.44 0.61 < 0.1 < 50 52.8 < 5 0.73 0.71 < 0.5 254 18.1 < 0.1 182 9.6 AB-28S Ash Pore Water 0.48 13.2 < 0.1 1,047 < 0.08 < 0.025 0.79 8.8 8610 8.5 2,695 10.8 3.3 1.6 2,263 194 0.36 537 < 0.3 AB-29D Deep < 0.5 0.32 < 0.1 380 < 0.08 0.47 0.62 0.4 < 50 1.9 7 0.3 3.2 < 0.5 243 49.2 < 0.1 178 6.9 AB-29S Ash Pore Water 0.53 447 < 0.1 780 < 0.08 < 0.025 < 0.5 2.5 2,564 49.7 2,007 9.8 1.6 < 0.5 1,191 60.1 < 0.1 236 6.9 AB-29SL Ash Pore Water 5.2 69.9 < 0.1 2,088 < 0.08 0.036 < 0.5 < 0.1 57.3 56.5 315 22.9 < 0.5 8.4 1,073 141 < 0.1 290 59.2 AB-29SS Shallow < 0.5 0.13 < 0.1 569 < 0.08 1.4 1.8 0.2 135 < 2.5 11 0.16 1 0.73 < 0.5 323 94 < 0.1 230 4.9 AB-30D Deep < 0.5 1 0.15 < 0.1 < 50 < 0.08 0.35 0.45 0.1 < 50 1.8 3 0.16 < 0.5 < 0.5 186 26.4 < 0.1 152 11.9 AB-30S Ash Pore Water 0.38 297 < 0.1 549 < 0.08 0.075 < 0.5 2.1 1 4,312 30.8 1070 6.2 1.3 0.86 1,248 132 0.082 349 6.5 AB-31D Deep - - - 412 - - - -I - - - - - - - - - - - AB-31S Shallow < 0.5 0.079 < 0.1 11995 0.095 0.21 1.5 0.1 447 0.6 36 < 0.5 0.86 < 0.5 301 122 < 0.1 228 1.1 AB-32D Deep < 0.5 0.19 < 0.1 663 < 0.08 0.039 1.2 0.3 254 3.2 18 0.56 0.94 < 0.5 211 30.5 < 0.1 162 7.6 AB-32S Shallow < 0.5 0.64 < 0.1 < 50 < 0.08 0.038 0.8 17.1 39,240 < 0.5 6,014 < 0.5 1.4 < 0.5 43 2 < 0.1 73 0.31 AB-33D Deep 1.1 0.24 < 0.1 190 < 0.08 0.06 1.8 0.1 68 79.2 47 0.93 1.2 < 0.5 426 7.9 < 0.1 175 3.2 AB-33S Ash Pore Water < 0.5 0.24 0.16 835 0.15 0.034 1.2 21.6 8,703 3.6 5,146 6 4.1 0.97 2,162 240 0.11 580 < 0.3 AB-33SS Shallow < 0.5 0.37 < 0.1 1,958 < 0.08 < 0.025 < 0.5 3.2 814 1 < 2.5 161111000011 < 0.5 1 < 0.5 1 30 115 < 0.1 216 0.43 AB-34D Deep < 0.5 1 0.14 < 0.1 < 50 < 0.08 0.44 1.7 0.2 260 < 2.5 6 0.6 2 < 0.5 128 1.3 < 0.1 98 11.5 AB-34S Ash Pore Water < 0.5 0.45 < 0.1 311 < 0.08 < 0.025 < 0.5 1.9 135,667 1.5 7,918 < 0.5 0.51 < 0.5 1,567 201 < 0.1 485 < 0.3 AB-35BR Bedrock 0.37 0.41 < 0.1 < 50 < 0.08 0.92 2.4 0.2 94 1.8 9 2.4 0.82 < 0.5 129 2.8 < 0.1 107 7.5 AB-35D Deep 0.42 0.95 < 0.1 < 50 < 0.08 3.1 < 0.1 < 50 17.3 < 5 1.8 1 < 0.5 < 0.5 193 3.5 < 0.1 14.8 AB-35PWS Shallow < 0.5 0.38 1 < 0.1 1 < 50 1 < 0.08 1 0.71 2.4 1 0.6 1 292 1 7.8 1 101 1 0.79 1 1.4 1 < 0.5 1 144 1 4.3 1 < 0.1 1 105 8.7 Rev. 1 23 April 2020 Page l of4 TABLE 6-5 MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019 AND OCTOBER 2019 CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY, CAROLINAS, LLC, BELMONT, NC Analytical Parameters Antimony Arsenic Beryllium Boron m (VI) Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Dissolved Solids Vanadium Reporting Units u9/L U9/L U9/L u9/LL U9/L u9/L u9/L u9/L u9/L U9/L u9/L u9/L U9/L m9/L u9/L m9/L u9/L 15A NCAC 02L Standard 1* 10 4* 700 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* 2018 Background Threshold Values Shallow Flow Zone)'0.8 0.6 0.1 50 M08O.013 7 2 884 NE 225 0.8 6 0.5 298 2 0.1 163 6 2019 Background Threshold Values Shallow Flow Zone)2 1 1 0.1 50 9 6 1,422 3 608 7 9 0.5 300 5 0.1 154 4 2019 Background Dataset Range Shallow Flow Zone)' 0.084 - <1 0.048 - 2.3 0.01 S1 - 0.22 4.4 - <50 - 3.2 0.11 -37.6 0.038 - 19.2 29 - 2940 0.16 - 3.6 2.8 - 1620 0.09 - 10.7 0.14 - 26.2 0.32 - <0.5 2.6 -309 <0.1 - 10.7 0.017 - <0.2 15 - <250 0.088 - 7.5 2018 Back round Threshold Values Dee Flow Zone 0.5 1 0.03 50 7 0.5 1 356 NE 26 1 2 5 0.6 232 5 1 0.1 158 12 2019 Background Threshold Values (Deep Flow Zone)' 1 1 1 50 1 2 16 665 25 256 26 10 0.8 240 15 0.1 173 16 2019Background DatasetRana Dee Flow ZoneZ 0.096'-0.85 0.048'-1.4 0.01'-<1 5.8-50.3 0.035'-<1 0.015'-1.8 0.23'BSI-93.2 0.0 27.5'B-823 0.89-44.9 2.7'-900 0.21'-30.2 0.16'-52.6 0.34'-1.2 31-251 0.5'-22 0.016'-<0.1 43-280 1.2-17.9 2018 Background Threshold Values Bedrock Flow Zone) 0.5 2 0.1 50 0.08 0.7 9 E-O.31 284 NE 278 9 5 0.5 181 7 0.1 165 16 2019 Background Threshold Values Bedrock Flow Zone)2 3 2 0.1 50 0.08 0.8 10 1,242 26 360 11 7 0.5 181 7 0.1 221 13 2019 Background Dataset Ran a Bedrock Flow Zone)' 0.27 j - 3.9 0.24- 1.6 0.01 j - <0.1 35.6 j - <50 <0.08 <0.025 - 0.66 0.33 j - 8.9 0.02 40.7 j - 715 0.9 j - 26.3 2.8 j - 278 1.7 - 10.5 0.22 j - 5.8 0.17 j - <0.5 97.7 - 223 1.8 - 33.3 0.02 j - <0.1 104 - 222 7.5 - 15.9 Sample ID Flow Zone Means Results At or Within the Waste Boundary Locations (Continued) AB-35S Ash Pore Water < 0.5 94.8 < 0.1 1008 < 0.08 < 0.025 2 0.27 37580 183.4 6302 14.9 2.1 < 0.5 1,906 130 < 0.1 558 0.81 AB-36D Deep < 0.5 0.41 < 0.1 < 50 < 0.08 0.15 < 0.5 < 0.1 133 1.4 5 1 1.1 < 0.5 119 3.8 < 0.1 95 8 AB-36S Ash Pore Water < 0.5 82.4 < 0.1 175 < 0.08 < 0.025 < 0.5 1.7 13754 41.8 1127 2 2.9 < 0.5 1,165 3.2 < 0.1 195 1.1 AB-37D Deep < 0.5 0.27 < 0.1 < 50 < 0.08 0.16 < 0.5 < 0.1 82 1.2 < 5 1.6 < 0.5 < 0.5 146 2.6 < 0.1 130 9.3 AB-37S Ash Pore Water < 0.5 0.19 < 0.1 < 50 < 0.08 0.3 0.59 < 0.1 139 < 2.5 12.5 0.11 0.56 < 0.5 143 2.0 < 0.1 112 7.5 AB-38BR Bedrock < 0.5 0.24 < 0.1 < 50 < 0.08 0.035 0.33 0.3 < 50 2.1 74 1.9 2 < 0.5 395 15.2 < 0.1 191 5.7 AB-38D Deep < 0.5 0.20 < 0.1 < 50 < 0.08 0.099 < 0.5 0.6 159 14.8 50 0.45 2.7 < 0.5 397 16.6 < 0.1 199 4.8 AB-38S Ash Pore Water < 0.5 213 < 0.1 118 < 0.08 < 0.025 0.59 1.3 33980 6.3 1552 1.7 0.65 < 0.5 786 5.6 0.1 164 0.44 AB-38SS Shallow < 0.5 0.17 < 0.1 < 50 < 0.08 < 0.025 0.87 3.5 1 356 < 2.5 167 < 0.5 4.1 < 0.5 109 2.9 1 < 0.1 120 1 AB-39D Deep < 0.5 0.18 < 0.1 90 < 0.08 0.06 < 0.5 0.1 58 3.7 26 0.19 1.3 4.7 438 33.1 < 0.1 221 2.6 AB-39S Ash Pore Water < 0.5 1.8 < 0.1 119 < 0.08 < 0.025 < 0.5 1.9 59440 0.6 5488 0.25 < 0.5 < 0.5 274 3.4 < 0.1 230 0.65 AB-40D Deep <1 <1 <1 142 <1 <0.025 2.7 734 4.195 i 701 2 7.86 <1 375 63 <0.2 254 2.88 AB-40SS Shallow <1 0.421 i 1.11 1,160 <1 0.062 P4,M1,111,110 2.82 50.4 41,200 33 7,400 0.203 i 41.3 <1 3,240 590 0.614 942 0.564 AB-41D Deep <1 0.471 i <1 90 <1 <0.025 5.99 0.91 473 3.736 i 412 1.69 3.89 <1 547 160 <0.2 211 2.94 AB-41SS Shallow <1 27.5 29 144 2.36 <0.025 P4,110 0.684 i 5050 393 8 393,000 1.21 467 12.3 1,230 2,200 0.085 i 3,640 1 AB-42AP Ash Pore Water 4.9 206 <1 2,270 <1 0.1 0.553 i 1.56 38,900 288 3,750 28.8 2.07 0.845 i 4,110 430 0.231 951 1.69 AB-42D Deep <1 0.487 i <1 <50 <1 0.026 1.41 0.4 j 321 <5 71 4.2 1.06 1 <1 99 4.7 <0.2 117 5.36 AB-42SS Shallow <1 <1 <1 <50 <1 0.2 0.832 i 3.3 278 <5 451 0.702 i 4.26 <1 139 1.3 <0.2 122 2.84 AB-43AP Ash Pore Water 1.13 1,220 <1 1,880 <1 <0.025 1.5 1.4 17,800 162 2310.0 82.8 1.49 <1 3,170 160 0.187 i 554 12 AB-43D Deep <1 <1 <1 <50 <1 1.1 2.58 0.71 167 <5 65 0.881 j 1.26 <1 222 2.1 S1 <0.2 144 6.95 AB-43SS Shallow <1 2.1 <1 <50 <1 0.26 8.98 3.3 485 9 1,360 2.84 9.27 <1 426--IM 24 <0.2 208 2.85 AB-44D Deep <1 <1 <1 38 i <1 0.88 2.26 0.41 479 2.384 i 191 1.25 0.828 i <1 219 34 <0.2 153 5.67 AB-44SS Shallow <1 <1 <1 1,190 <1 <0.025 0.37 i 12.9 306 2.026 i 4,800 0.272 i 6.86 <1 410 370 <0.2 577 0.764 CCR-01DA Deep < 0.5 0.19 < 0.1 6 < 0.08 0.6125 0.8 1.8 1.2 < 0.5 1 < 0.1 125 CCR-01S Shallow 0.19 < 0.1 0.062 13 < 0.08 1.1 5 1 0.2 < 0.5 2.8 < 0.1 30 CCR-02D Deep < 0.5 0.29 < 0.1 72 < 0.08 < 0.5 0.5 46.8 1.0 < 0.5 13.5 < 0.1 293 CCR-02S Shallow 0.66 0.13 0.049 4 < 0.08 3.5 0.8 1.5 0.7 < 0.5 0.7 < 0.1 31 CCR-03DA Deep 0.27 0.85 < 0.1 12 < 0.08 1.1 0.2 21.6 or6.1 < 0.5 10.4 < 0.1 250 CCR-03S Shallow < 0.5 0.32 0.13 463 0.27 2.4 46.4 1.5 < 0.5 0.92 112 0.11 231 CCR-04DA Deep < 0.5 1.1 < 0.1 40 < 0.08 0.71 0.3 24.7 0.56 < 0.5 170 < 0.1 431 CCR-04SA Shallow < 0.5 77.6 21.9 296 4.7 1.8 2,100 44.2 < 0.5 45.5 1,310 0.80 1,913 CCR-05D Deep < 0.5 0.27 < 0.1 38 < 0.08 < 0.5 0.2 1.8 0.9 < 0.5 42 < 0.1 193 CCR-05S Shallow < 0.5 4.7 7.8 638 6.7 0.56 633 180.5 < 0.5 8.5 796 2.2 1 1,275 CCR-06D Deep < 0.5 0.13 < 0.1 25 < 0.08 < 0.5 0.1 1 2.9 0.86 < 0.5 6.6 < 0.1 125 CCR-06S Shallow < 0.5 5.4 1.6 620 < 0.08 1.2 38.2 22.7 < 0.5 4.1 2,738 3.6 4,060 CCR-07D Deep < 0.5 1 0.12 < 0.1 733 < 0.08 1.1 0.3 1.3 0.54 < 0.5 92.1 < 0.1 223 CCR-07S Shallow < 0.5 0.3 0.13 1,805 0.087 0.91 6.2 1.7 < 0.5 < 0.5 241 < 0.1 455 CCR-08D Deep < 0.5 0.14 < 0.1 1,355 < 0.08 0.55 0.2 4.2 0.22 < 0.5 95.8 < 0.1 219 CCR-08S Shallow < 0.5 0.49 0.1 1,595 0.12 0.51 46.4 0.7 < 0.5 0.79 253 0.12 419 CCR-09D Deep < 0.5 < 0.1 < 0.1 1,863 < 0.08 < 0.5 0.2 2.1 2.5 < 0.5 134 < 0.1 264 CCR-09S Shallow < 0.5 0.2 < 0.1 1,355 < 0.08 < 0.5 19.3 < 2.5 < 0.5 < 0.5 191 0.12 321 CCR-11DA Deep < 0.5 < 0.1 < 0.1 1,390 < 0.08 0.68 0.1 1.2 0.76 0.36 81.4 < 0.1 182 CCR-11S Shallow < 0.5 0.086 < 0.1 178 < 0.08 1.2 0.1 1 10.9 1.8 83.8 < 0.1 278 CCR-14D Deep < 0.5 0.27 < 0.1 576 < 0.08 2 0.4 1.7 1.8 < 0.5 43.2 < 0.1 178 CCR-14S Shallow < 0.5 0.079 < 0.1 680 < 0.08 < 0.5 9.1 1 < 0.5 0.55 34.7 < 0.1 109 CCR-16BR Bedrock < 0.5 0.12 < 0.1 479 < 0.08 0.28 0.57 < 0.1 88 < 2.5 < 5 0.32 1.4 < 0.5 264 37.6 < 0.1 164 8.1 CCR-16D Bedrock < 0.5 0.35 < 0.1 604 < 0.08 < 0.5 0.1 36.7 0.78 < 0.5 38.8 < 0.1 184 CCR-16S Shallow < 0.5 0.27 0.058 1,720 0.080 0.68 2 0.9 < 0.5 < 0.5 125 0.077 286 CCR-17D Bedrock < 0.5 0.24 < 0.1 1,520 < 0.08 < 0.5 0.1 1.6 0.43 < 0.5 47.8 < 0.1 302 CCR-17S Shallow < 0.5 0.083 < 0.1 1,398 < 0.08 1.7 0.8 0.5 < 0.5 < 0.5 43.8 0.13 202 CCR-18D Deep < 0.5 0.16 < 0.1 286 < 0.08 < 0.5 0.2 1.3 0.73 < 0.5 47.3 < 0.1 258 CCR-18S Shallow < 0.5 0.26 0.61 24 < 0.08 1.6 24 1.9 < 0.5 0.6 69.8 < 0.1 129 CCR-20D Deep < 0.5 0.11 < 0.1 508 < 0.08 0.56 0.5 0.9 0.42 0.68 44 < 0.1 261 CCR-20S Shallow < 0.5 0.11 0.46 185 < 0.08 2 12.1 2.9 < 0.5 0.49 15 < 0.1 122 CCR-21D Deep < 0.5 0.1 < 0.1 401 < 0.08 < 0.5 0.1 9.5 0.58 < 0.5 44.5 < 0.1 308 CCR-21S Shallow < 0.5 0.11 2 1,618 0.73 0.67 48.6 7.6 < 0.5 0.29 22.9 0.21 179 CCR-22DA Deep 1.5 0.46 < 0.1 17 < 0.08 3 0.1 11.7 9.3 < 0.5 27.9 < 0.1 1 188 CCR-22S Shallow < 0.5 < 0.1 0.24 4 < 0.08 0.91 4.6 2.8 < 0.5 < 0.5 3.3 0.063 74 CCR-23D Deep < 0.5 0.12 < 0.1 5 < 0.08 0.67 0.6 1.3 0.89 < 0.5 2.3 < 0.1 136 CCR-23S Shallow < 0.5 < 0.1 0.062 3 < 0.08 < 0.5 0.8 0.5 < 0.5 < 0.5 < 1 < 0.1 61 GWA-06BRA Bedrock 0.91 0.2 < 0.1 < 50 < 0.08 1 0.056 3 3.7 1 253 16.9 220 1.4 3 < 0.5 714 130 < 0.1 378 6.7 GWA-06BRL Bedrock 0.15 4.2 < 0.1 75 < 0.08 0.034 1.1 0.4 401 4 67 17.3 1.4 < 0.5 376 71.8 < 0.1 264 0.74 GWA-06DA Deep 0.66 1 0.84 < 0.1 29 < 0.08 0.026 2.3 0.5 936 12.9 761 0.9 2.3 < 0.5 998 341 < 0.1 870 0.95 GWA-06S Shallow < 0.5 121 35.1 281 6.9 5.1 8.6 3,072 2,720 36.4 131,200 < 0.5 660 84.1 1,436 1,380 0.61 2,225 0.73 GWA-27D Deep <1 <1 <1 29 i <1 <0.025 2.33 2.1 942 <5 351 3.34 3.9 0.344 i 1,040 260 <0.2 530 3.2 GWA-27S Shallow <1 <1 0.384 i 143 1.34 0.3 P4,R0 4.09 785 217 1.982 i 45,200 0.155 i 151 <1 304 270 <0.2 478 0.307 GWA-30D Deep <1 <1 <1 207 <1 0.038 0.388 i 4.94 652 4.823 i 1,300 0.434 i 10.6 <1 1,690 640 <0.2 289 1 1.26 GWA-30S Shallow <1 0.438 i <1 1 361 0.909 i <0.025 P4,RO 0.704 i 67.2 67 1 <5 23,700 0.091 i 24.6 1 <1 1 221 1 980 1 <0.2 1 254 1 1.16 At or Beyond the Compliance Boundary Locations - Upgradient of the Ash Basin AB-04BR AB-04D Bedrock Deep < 0.5 < 0.5 0.21 0.075 < 0.1 < 0.1 < 50 < 50 0.14 < 0.08 1.5 5.4 1.5 6.3 1.2 0.1 < 50 103 4 < 2.5 213 7 2.3 < 0.5 1.5 2.7 < 0.5 < 0.5 6 184 4.8 1.9 < 0.1 < 0.1 217 103 3.4 4.5 AB-04S Shallow < 0.5 0.14 < 0.1 < 50 < 0.08 0.1 < 0.5 0.2 622 0.51 38 < 0.5 0.59 < 0.5 51 9.4 < 0.1 93 1.1 AB-13D Deep < 0.5 0.13 < 0.1 < 50 < 0.08 0.86 1.3 0.1 129 < 2.5 8 0.72 0.81 < 0.5 190 < 1 < 0.1 122 5.9 AB-13S Shallow < 0.5 < 0.1 < 0.1 < 50 < 0.08 0.45 0.81 0.8 57 < 2.5 66 < 0.5 2.7 < 0.5 67 1.6 < 0.1 85 0.76 AB-14BR Bedrock < 0.5 1.1 < 0.1 < 50 < 0.08 0.17 < 0.5 < 11 < 50 1.7 < 5 7.7 < 0.5 < 0.5 149 5 < 0.1 134 Rev. 1 23 April 2020 Page 2 of 4 TABLE 6-5 MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019 AND OCTOBER 2019 CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY, CAROLINAS, LLC, BELMONT, NC Analytical Parameters Antimony Arsenic Beryllium Boron m (VI) Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Dissolved Solids Vanadium Reporting Units u9/L U9/L U9/L u9/LL U9/L u9/L u9/L u9/L u9/L U9/L u9/L u9/L U9/L m9/L u9/L m9/L u9/L 15A NCAC 02L Standard 1* 10 4* 700 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* 2018 Background Threshold Values Shallow Flow Zone)'0.8 0.6 0.1 50 M08O.013 7 2 884 NE 225 0.8 6 0.5 298 2 0.1 163 6 2019 Background Threshold Values Shallow Flow Zone)2 1 1 0.1 50 9 6 1,422 3 608 7 9 0.5 300 5 0.1 154 4 2019 Background Dataset Range Shallow Flow Zone)' 0.084 - <1 0.048 - 2.3 0.01 S1 - 0.22 4.4 - <50 - 3.2 0.11 -37.6 0.038 - 19.2 29 - 2940 0.16 - 3.6 2.8 - 1620 0.09 - 10.7 0.14 - 26.2 0.32 - <0.5 2.6 -309 <0.1 - 10.7 0.017 - <0.2 15 - <250 0.088 - 7.5 2018 Back round Threshold Values Dee Flow Zone 0.5 1 0.03 50 7 0.5 1 356 NE 26 1 2 5 0.6 232 5 1 0.1 158 12 2019 Background Threshold Values (Deep Flow Zone)' 1 1 1 50 1 2 16 0.8 665 25 256 26 10 0.8 240 15 0.1 173 16 2019Background DatasetRan a Dee Flow ZoneZ 0.096'-0.85 0.048'-1.4 0.01'-<1 5.8-50.3 0.035'-<1 0.015'-1.8 0.23'BSI-93.2 0.019'-4.6 27.5'B-823 0.89-44.9 2.7'-900 0.21'-30.2 0.16'-52.6 0.34'-1.2 31-251 0.5'-22 0.016'-<0.1 43-280 1.2-17.9 2018 Background Threshold Values Bedrock Flow Zone) 0.5 2 0.1 50 0.08 0.7 9 0.3 284 NE 278 9 5 0.5 181 7 0.1 165 16 2019 Background Threshold Values Bedrock Flow Zone)2 3 2 0.1 50 0.08 0.8 10 0.3 1,242 26 360 11 7 0.5 181 7 0.1 221 13 2019 Background Dataset Ran a Bedrock Flow Zone)' 0.27 j - 3.9 0.24- 1.6 0.01 j - <0.1 35.6 j - <50 <0.08 <0.025 - 0.66 0.33 j - 8.9 0.021 -- 0.31 40.7 j - 715 0.9 j - 26.3 2.8 i - 278 1.7 - 10.5 0.22 j - 5.8 0.17 j - <0.5 97.7 - 223 1.8 - 33.3 0.02 j - <0.1 104 - 222 7.5 - 15.9 Sample ID Flow Zone Means Results At or Beyond the Compliance Boundary Locations - Upgradient of the Ash Basin (Continued) AB-14D Deep < 0.5 < 0.1 0.12 158 < 0.08 2.7 2.7 0.9 125 < 2.5 12 < 0.5 5.7 < 0.5 66 27.5 < 0.1 110 0.65 GWA-09BR Bedrock 0.8 0.44 < 0.1 < 50 0.096 0.22 0.51 0.1 79 4.5 19 8.1 0.61 < 0.5 117 11.5 < 0.1 131 9.8 GWA-09D Deep < 0.5 0.2 < 0.1 < 50 < 0.08 0.62 1.0 0.1 164 < 2.5 9 0.89 0.48 < 0.5 112 2.3 < 0.1 97 5.9 GWA-09S Shallow < 0.5 0.21 0.11 < 50 < 0.08 0.041 0.61 7.1 156 < 2.5 324 < 0.5 2.9 < 0.5 78 16.3 < 0.1 104 0.42 GWA-14DA Deep 1.4 0.73 < 0.1 < 50 < 0.08 0.997 1.2 0.1 < 50 25.3 < 5 4.2 0.43 < 0.5 206 5.2 < 0.1 135 13.2 GWA-14S Shallow < 0.5 0.1 0.14 < 50 0.12 0.21 0.51 3.1 91 < 2.5 23 < 0.5 1.6 < 0.5 4 < 1 < 0.1 47 < 0.3 GWA-15D Deep < 0.5 0.15 < 0.1 < 50 0.12 1 1.4 < 0.1 < 50 2.0 4 0.13 0.91 < 0.5 246 3.5 < 0.1 155 5.0 GWA-15S Shallow < 0.5 0.14 < 0.1 71 < 0.08 0.99 1.2 0.1 229 < 2.5 25 < 0.5 2.4 < 0.5 169 11.1 < 0.1 107 4.4 GWA-22D Deep 0.17 1 0.17 1 < 0.1 1 < 50 1 < 0.08 1 0.79 1 2.7 1 0.3 1 317 1 1.7 1 18 1 0.49 1 3.7 1 < 0.5 1 291 1 1.2 1 < 0.1 1 186 1 12 GWA-22S GWA-24BR Shallow Bedrock < 0.5 < 0.5 0.086 0.6-5 1 0.1 < 0.1 < 50 < 50 0.13 < 0.08 0.1 0.17 0.56 0.85 15.1 0.3 246 700 < 2.5 4.5 32 < 0.5 3.4 2.1 1.1 < 0.5 < 0.5 6 110 1.4 10.1 < 0.1 < 0.1 < 25 131 0.25 9.5 GWA-24D Deep < 0.5 0.23 1 < 0.1 1 < 50 < 0.08 1 1.2 1 1.3 1 0.1 1 244 1 < 2.5 1 7.2 1 0.31 1 0.4 1 < 0.5 1 92 1 2.8 1 < 0.1 1 112 1 11.1 GWA-24SA Shallow < 0.5 < 0.1 < 0.1 < 50 < 0.08 1 0.25 1 1.7 1 0.4 1 198 1 < 2.5 66 < 0.5 3.6 < 0.5 10 < 1 < 0.1 1 38 1 0.41 At or Beyond the Compliance Boundary Locations - Downgradient of the Ash Basin AB-06A Shallow < 0.5 1 0.13 < 0.1 < 50 < 0.08 9.9 10.5 0.1 52 0.54 12 < 0.5 1.1 0.42 227 30.4 < 0.1 135 3.7 AB-06R Shallow < 0.5 0.15 < 0.1 < 50 < 0.08 6.7 7.2 0.1 100 < 2.5 38 < 0.5 1.8 0.35 212 29.7 < 0.1 131 3.4 AB-09D Deep < 0.5 0.087 < 0.1 551 < 0.08 0.3 < 0.5 < 0.1 76 < 2.5 11 0.18 < 0.5 1.7 330 49.1 < 0.1 197 6.5 AB-09S Shallow < 0.5 0.11 < 0.1 722 < 0.08 < 0.025 < 0.5 8.6 8,062 < 0.5 10,050 < 0.5 0.89 < 0.5 147 33.9 < 0.1 131 < 0.3 AB-IOBR Bedrock < 0.5 0.19 < 0.1 554 < 0.08 0.065 1.6 0.3 504 < 2.5 35 0.8 1.9 < 0.5 527 46.8 < 0.1 271 7.8 AB-10BRL Bedrock < 0.5 8.3 < 0.1 420 < 0.08 0.047 0.94 0.1 333 3.9 70 8.9 1.3 < 0.5 565 165 < 0.1 551 0.47 AB-IOD Deep < 0.5 0.083 < 0.1 < 50 < 0.08 2.8 2.8 0.1 57 < 2.5 < 5 < 0.5 0.58 < 0.5 209 28.3 < 0.1 147 4.6 AB -SOS Shallow < 0.5 < 0.1 < 0.1 < 50 < 0.08 0.037 < 0.5 1.9 96 < 0.5 772 < 0.5 0.88 < 0.5 220 19.4 < 0.1 124 0.54 AB-11D Deep < 0.5 < 0.1 < 0.1 < 50 < 0.08 3.2 3.4 < 0.1 87 1 < 0.5 < 5 < 0.5 < 0.5 < 0.5 123 < 1 < 0.1 98 1.8 CCR-26BR Bedrock < 0.5 0.22 < 0.1 < 50 < 0.08 1.9 1.8 0.1 62 3.8 6 0.61 0.79 1.2 629 149 < 0.1 377 4.1 CCR-26D Deep < 0.5 0.13 < 0.1 < 50 < 0.08 2 2.1 < 0.1 176 2.1 19 0.28 0.71 0.66 320 56.4 < 0.1 197 4.3 CCR-26S Shallow < 0.5 1.9 < 0.1 < 50 < 0.08 < 0.025 0.62 11.2 45,575 < 2.5 1,100 0.17 1.1 < 0.5 98 2.2 < 0.1 80 0.29 CP-01D Deep 1.4 0.18 < 0.1 76 < 0.08 0.14 3.6 2.4 < 50 4.6 30,133 < 0.5 1.8 0.91 11510 657 < 0.1 1,074 1.1 CP-01S Shallow < 0.5 0.48 < 0.1 < 50 < 0.08 < 0.025 0.7 51.4 32,733 < 2.5 5,133 0.16 0.63 < 0.5 341 342 0.18 563 < 0.3 CP-02D Deep < 0.5 0.28 < 0.1 24 0.080 < 0.025 0.73 2.2 75 3.6 1,673 0.4 34.7 < 0.5 3,697 2,152 < 0.1 3,318 2.9 CP-02S Shallow < 0.5 0.79 < 0.1 < 50 0.10 < 0.025 0.9 10.4 3,243 < 2.5 2,960 0.36 13.7 < 0.5 3,100 1,746 < 0.1 2,656 0.37 CP-03D Deep < 0.5 1 0.55 < 0.1 < 50 < 0.08 < 0.025 0.52 8 1 3,190 3.8 3,223 1.5 2.8 < 0.5 1,330 540 1 < 0.1 929 0.42 CP-03S Shallow 0.28 0.97 0.24 < 50 0.35 < 0.025 1.1 49.4 1,061 4.8 3,090 < 0.5 5.1 2.3 901 928 0.076 1,434 0.39 CP-04D Deep < 0.5 0.26 < 0.1 478 < 0.08 < 0.025 < 0.5 0.3 431 4.7 418 0.51 1.9 < 0.5 584 24 < 0.1 291 3.9 CP-04S Shallow < 0.5 0.11 < 0.1 32 < 0.08 < 0.025 < 0.5 18.8 5,970 < 2.5 3,400 < 0.5 0.34 < 0.5 109 65.2 0.12 133 < 0.3 CP-05D Deep < 0.5 0.18 < 0.1 709 < 0.08 0.036 < 0.5 1.4 474 4.8 459 0.59 1.6 < 0.5 868 253 < 0.1 491 1.1 CP-05S Shallow < 0.5 0.19 < 0.1 < 50 < 0.08 < 0.025 0.86 36.1 4,544 < 2.5 5,523 < 0.5 1.8 < 0.5 45.6 18.9 0.11 138 0.34 CP-06BR Bedrock 0.18 4.7 < 0.1 47 < 0.08 0.042 < 0.5 < 0.1 < 50 4.8 14 6.6 0.4 < 0.5 194 50 < 0.1 267 0.30 CP-06D Deep < 0.5 0.24 < 0.1 1,488 < 0.08 0.041 1.4 1 562 2.7 280 1.3 0.5 < 0.5 456 122 < 0.1 266 0.78 CP-06S Shallow < 0.5 0.29 < 0.1 1,354 < 0.08 0.029 < 0.5 12.9 4,517 2.5 2,790 < 0.5 0.42 < 0.5 341 185 < 0.1 323 < 0.3 GWA-01BR Bedrock < 0.5 1 0.84 < 0.1 < 50 < 0.08 0.086 0.55 0.2 1 < 50 10.8 33 1.7 < 0.5 < 0.5 244 15 < 0.1 175 6.3 GWA-01D Deep < 0.5 0.19 < 0.1 52 < 0.08 6.5 6.6 < 0.1 70 6.1 7 0.26 0.64 < 0.5 288 11.6 < 0.1 177 5.9 GWA-01S Shallow < 0.5 < 0.1 0.12 < 50 < 0.08 0.83 2.9 3.4 86 < 2.5 13 < 0.5 1.7 < 0.5 11 < 1 0.043 75 < 0.3 GWA-02D Deep < 0.5 0.14 < 0.1 < 50 < 0.08 2.6 2.8 < 0.1 126 3.4 5 0.19 < 0.5 < 0.5 132 1.6 < 0.1 106 4.3 GWA-02S Shallow < 0.5 < 0.1 0.092 < 50 < 0.08 0.058 < 0.5 6.8 85 < 2.5 150 < 0.5 0.96 < 0.5 29 < 1 < 0.1 40 < 0.3 GWA-03BRA Bedrock 1.4 1.9 < 0.1 85 < 0.08 0.037 1.1 0.1 < 50 41.5 < 5 2.4 1.6 < 0.5 111 17.8 < 0.1 149 0.66 GWA-03BRL Bedrock < 0.5 1.4 < 0.1 < 50 < 0.08 0.036 < 0.5 < 0.1 < 50 < 2.5 5 3.1 < 0.5 0.55 129 6.1 < 0.1 128 5.2 GWA-03D Deep < 0.5 0.3 < 0.1 117 < 0.08 0.31 0.86 0.3 133 6.2 13 1 0.46 < 0.5 133 10.9 < 0.1 129 8.4 GWA-03S Shallow < 0.5 0.13 < 0.1 338 < 0.08 < 0.025 0.84 11.5 7,0 0.66 2,130 < 0.5 0.76 < 0.5 1 96 41.4 < 0.1 1 129 < 0.3 GWA-04BR Bedrock 0.54 1 0.33 < 0.1 380 < 0.08 0.038 < 0.5 < 0.1 1 62 2.2 53 2.8 < 0.5 0.52 130 41.4 < 0.1 179 1.2 GWA-04BRL Bedrock 0.12 3.4 < 0.1 206 < 0.08 0.14 3.2 0.1 128 15.6 38 26.5 2.4 0.92 375 261 < 0.1 1,146 4.8 GWA-04D Deep < 0.5 0.092 < 0.1 679 < 0.08 0.03 < 0.5 < 0.1 70 < 2.5 14 0.36 < 0.5 1.3 243 68.3 < 0.1 170 4.5 GWA-04S Shallow < 0.5 0.13 < 0.1 2,027 < 0.08 0.029 0.67 4.3 505 0.51 533 < 0.5 0.54 < 0.5 372 147 0.062 272 < 0.3 GWA-05BRA Bedrock < 0.5 0.88 < 0.1 736 < 0.08 0.038 0.62 0.1 134 2 87 3.1 0.92 < 0.5 220 56.7 < 0.1 195 0.75 GWA-05BRL Bedrock 0.29 5.4 < 0.1 43 < 0.08 0.036 < 0.5 0.1 111 1.3 24 8.5 1.5 < 0.5 202 55.4 < 0.1 208 1.2 GWA-05D Bedrock < 0.5 0.31 < 0.1 656 < 0.08 0.095 0.58 0.3 242 6.4 147 0.75 0.69 < 0.5 225 37.6 < 0.1 171 4.7 GWA-05S Shallow < 0.5 0.26 < 0.1 < 50 0.3 0.052 0.58 21.3 1,250 < 2.5 5,804 < 0.5 3.2 0.51 44 1 16 0.12 116 0.43 GWA-07D GWA-07S GWA-28BR Deep Shallow Bedrock < 0.5 < 0.5 <1 0.11 1 1.6 0.551 i < 0.1 1.0 <1 < 50 < 50 21 i < 0.08 0.24 <1 <0.025 M1 6.6 6.6 <1 < 0.1 65.5 <1 88 148 1.2 4.3 5 334 0.14 < 0.5 0.64 9.7 2.8 3.7 582 18 112 101 < 0.1 0.11 304 170 4.3 < 0.3 53 2.979 i 89 5.13 <1 <1 853 480 <0.2 794 3.06 GWA-28D Deep <1 <1 <1 <50 <1 <0.025 2.16 10.1 734 6 3,270 2.2 2.56 0.528 i 1,980 880 <0.2 1,480 1.2 GWA-28S Shallow <1 <1 0.63 i <50 <1 <0.025 0.496 i 22.4 386 <5 4,800 0.092 i 2.46 0.436 i 126 11100 0.126 i 1,520 0.954 GWA-29BR Bedrock <1 0.454 i <1 <50 <1 <0.025 0.75 i 1.9 1000 2.916 i 449 3.26 2.11 <1 2,840 1,100 <0.2 1,870 2.39 GWA-29D Deep <1 <1 <1 <50 <1 <0.025 0.541 i 4.1 367 <5 610 1.97 16.9 0.423 i 2,090 680 <0.2 1,170 2.05 GWA-29S Shallow <1 0.338 i <1 1 <50 <1 <0.025 1 <1 9.1 400 <5 2,210 0.293 i 3.74 <1 1 504 190 1 <0.2 384 0.417 At or Beyond the Compliance Boundary Locations - Sidegradient of the Ash Basin AB-01R Shallow < 0.5 0.1 < 0.1 < 50 < 0.08 3.8 4.3 0.1 97 0.97 7 0.15 1.4 0.9 3 114 < 0.1 258 2.2 AB-02 Shallow < 0.5 < 0.1 0.1 < 50 < 0.08 0.31 0.43 0.8 96 0.71 34 < 0.5 1.2 < 0.5 4 1.1 < 0.1 30 < 0.3 AB-02D Deep < 0.5 0.1 < 0.1 < 50 < 0.08 2.5 2.5 < 0.1 73 0.59 < 5 < 0.5 0.89 < 0.5 87 < 1 < 0.1 69 4.3 AB-05 Shallow < 0.5 < 0.1 < 0.1 < 50 < 0.08 1.4 4.6 0.1 512 0.6 15 < 0.5 2.9 < 0.5 17 1 < 0.1 29 1.1 GWA-08D Deep < 0.5 0.1 < 0.1 < 50 < 0.08 0.60 1.2 0.2 177 1.5 6 0.49 1.3 < 0.5 268 1.1 < 0.1 128 7 WA -Shallow < < .1 < .1 < < .2 4 < 2. 1 1 .1 < 4 1. < .1 2 nA Rev. 1 Page 3 of 23 April 2020 TABLE 6-5 MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019 AND OCTOBER 2019 CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY, CAROLINAS, LLC, BELMONT, NC Analytical Parameters Antimony Arsenic Beryllium Boron m (VI) Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Dissolved Solids Vanadium Reporting Units IJ9/L 419/L 419/L IJ9/L/L 419/L IJ9/L IJ9/L IJ9/L IJ9/L 419/L IJ9/L IJ9/L 419/L m9/L u9/L m9/L IJ9/L 15A NCAC 02L Standard 1* 10 4* 700 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* 2018 Background Threshold Values Shallow Flow Zone)'0.8 0.6 0.1 50 M08O.013 7 2 884 NE 225 0.8 6 0.5 298 2 0.1 163 6 2019 Background Threshold Values Shallow Flow Zone)2 1 1 0.1 50 9 6 1,422 3 608 7 9 0.5 300 5 0.1 154 4 2019 Background Dataset Range Shallow Flow Zone)' 0.084 - <1 0.048 - 2.3 0.01 S1 - 0.22 4.4 - <50 - 3.2 0.11 -37.6 0.038 - 19.2 29 - 2940 0.16 - 3.6 2.8 - 1620 0.09 - 10.7 0.14 - 26.2 0.32 - <0.5 2.6 -309 <0.1 - 10.7 0.017 - <0.2 15 - <250 0.088 - 7.5 2018 Back round Threshold Values Dee Flow Zone 0.5 1 0.03 50 7 0.5 1 356 NE 26 1 2 5 0.6 232 5 1 0.1 158 12 2019 Background Threshold Values (Deep Flow Zone)' 1 1 1 50 1 2 16 665 25 256 26 10 0.8 240 15 0.1 173 16 2019Background DatasetRana Dee Flow ZoneZ 0.096'-0.85 0.048'-1.4 0.01'-<1 5.8-50.3 0.035'-<1 0.015'-1.8 0.23'BSI-93.2 0.0 27.5'B-823 0.89-44.9 2.7'-900 0.21'-30.2 0.16'-52.6 0.34'-1.2 31-251 0.5'-22 0.016'-<0.1 43-280 1.2-17.9 2018 Background Threshold Values Bedrock Flow Zone) 0.5 2 0.1 50 0.08 0.7 9 E-O.31 284 NE 278 9 5 0.5 181 7 0.1 165 16 2019 Background Threshold Values Bedrock Flow Zone)2 3 2 0.1 50 0.08 0.8 10 1,242 26 360 11 7 0.5 181 7 0.1 221 13 2019 Background Dataset Ran a Bedrock Flow Zone)' 0.27 j - 3.9 0.24 - 1.6 0.01 j - <0.1 35.6 j - <50 <0.08 <0.025 - 0.66 0.33 j - 8.9 0.02 40.7 j - 715 0.9 j - 26.3 2.8 j - 278 1.7 - 10.5 0.22 j - 5.8 0.17 j - <0.5 97.7 - 223 1.8 - 33.3 0.02 j - <0.1 104 - 222 7.5 - 15.9 Sample ID Flow Zone Means Results At or Beyond the Compliance Boundary Locations - Sidegradient of the Ash Basin (Continued) GWA-17D Deep < 0.5 1 0.2 < 0.1 < 50 < 0.08 0.31 1.6 1.1 459 2 2 0.82 1.1 < 0.5 6 3.3 < 0.1 122 5.2 GWA-17S Shallow < 0.5 0.2 < 0.1 < 50 < 0.08 6.3 6.4 0.1 148 0.69 10 0.35 1.7 < 0.5 131 4.7 < 0.11 79 1 2 GWA-18D Deep < 0.5 1 0.4 1< 0.1 < 50 1 < 0.08 1 0.88 1 1.4 1 0.1 1 67 1 4.0 1 9 1 0.64 1 1.1 1 < 0.5 1 166 1 2.6 1 < 0.1 1 113 8 GWA-18S I Shallow I < 0.5 1 0.5 1 < 0.1 < 50 1 < 0.08 1 0.95 1 1.4 1 0.1 1 763 1 0.34 1 77 1 0.35 1 2 1 < 0.5 1 188 1 < 1 I < 0.1 1105 Prepared by: LW D Checked by: JYT / DAA Notes: Revised by: EMY / LWD ` - Background threshold values were calculated using data from background groundwater samples collected June 2015 to September 2017. 2 - Background threshold values and background dataset ranges were calculated using data from background groundwater samples collected March 2011 to December 2018. Statistical mean calculated from data ranging from January 2018 to June 2019. Ash pore water results are not compared to groundwater standards or criteria. For wells with datasets containing fewer than four valid results, the most recent valid sample data was used. 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 (R0 qualified) 3) if a result was non -detect at a reporting limit (RL) greater than the normal laboratory RL Bold text - greatest comparative value - 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 - highlighted concentration indicates value is either within range of background threshold values for constituents where there is no regulatory standard/background threshold values are greater than regulatory standard, or within range of background threshold value and the 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 NE - not established mg/L - milligrams per liter pg/L - micrograms per liter Rev. 1 Page of 23 April 2020 --d—t., thAllen St— Pitd—t Maximum d. NG.bt, T—tft All.. St— ... —h.. � f 02L Statistically Station Flow Zone st.t.h B—g--d G....d—te, Comparative Criter ia --d—tt, Monitoring Well. With COT CConcentrationonlntte.t tt,nmg Unit IMAC tt—d B-91 ..d BB.tkg,o."d Value Range .e.,t d p—ti— CriteriaUpdcdt-mh ,,DItIIIt 1A,, 11 C.�— N.., or B.V..d Greater Th.. C—(2018 CSA—DA—tt Range (All Zones)FIow (.0..$) Bo..i.co.ple... B.—d-y Rationale forSel—m. of COI. forCt-- A—. Evaluation e ,A h.- greater than Comparative criteria i. all fl— ..Itiple Ime. f tvid... —pp— t— constituent tl.ttd t. tM1e source TABLE 6-9 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium Chromium Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Vanadium (VI) Dissolved Impacted by Coal Ash? Comments Reporting Units ug/L u9/L u9/L u9/L ug/L ug/L 1,9/L I ug/L 1,9/L u9/L ug/L u9/L ug/L ug/L ug/L mg/L ug/L mg/L ug/L SSA NCAC 02L Standard 1* SO 4* 700 2 SO SO 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* Back round Threshold Values Bedrock Unit 0.5 2 0.1 50 0.08 0.7 9 0.3 284 NE 278 9 5 0.5 181 7 0.1 165 16 Background Threshold Values Bedrock Unit 3 2 0.1 50 0.08 0.8 10 0.3 1,242 26 360 11 7 0.5 181 7 0.1 221 13 Back round Data Set Range Bedrock Unit 0.27 - 3.9 0.24 - 1.6 0.01 i - <0.1 35.6 - <50 <0.08 <0.025 - 0.66 0.33 L - 8.9 0.021 - 0.31 40.7 - 715 0.9 L - 26.3 2.8 j - 278 1.7 - 10.5 0.22 i - 5.8 0.17 - <0.5 97.7 - 223 1.8 - 33.3 0.02 - <0.1 104 - 222 7.5 - 15.9 Sample ID Sample Analytical Results Collection Date ALI 02/10/2015 <1 <5 <1 <100 <0.1 <10 <1 <1 65 NA <5 <5 <5 <5 130 <1 <0.1 98 5 No All COls are below comparative criteria ALI 08 03 2015 <0.5 <0.5 <0.2 <5 <0.08 0.17 <0.5 <0.5 <50 NA 1.1 0.63 <0.5 <0.5 124 <2 <0.1 100 6.3 AL100 03/17/2015 <3 <10 <1 <100 <1 <20 <10 <5 19.7 NA 1.54 <10 <10 <10 162 <10 <1 134 10 No All COls are below comparative criteria AL100 05 12 2015 <0.5 <0.5 <0.2 <5 <0.08 0.56 0.71 <0.5 <50 NA <0.5 0.89 <0.5 <0.5 161 2.8 <0.1 150 12.8 AL-1000 01/01/2016 <0.5 0.53 <0.1 <25 <0.08 0.2 <0.5 <0.1 <50 NA 1.3 0.91 <0.5 0.53 331 4.4 <0.1 184 7.3 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage system. se arated bv a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1001 01/01/2016 <0.5 0.78 <0.1 <25 <0.08 0.042 <0.5 <0.1 <50 NA 2.7 2.5 <0.5 <0.5 296 60.4 <0.1 200 0.78 No of the Site drainage system, separated by a hydrologic divide. GWA-9S/D/BR, located between the source areas and AL- 1001 do not exceed background for strontium. AL-1002 01/01/2016 <0.5 1 1.2 <0.1 <25 <0.08 I <0.03 <0.5 <0.1 I <50 NA 2.7 3.2 1 <0.5 <0.5 177 4.3 <0.1 103 2.4 No All COls are below com arative criteria AL-1003 01/01/2016 <0.5 1 1.1 <0.1 <25 <0.08 0.052 <0.5 <0.1 <50 NA <0.5 4.1 <0.5 <0.5 151 1 5.9 <0.1 1 133 2.2 No All COls are below comparative criteria West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1004 01/01/2016 <0.5 1.5 1 <0.1 <25 <0.08 0.1 <0.5 <0.1 <50 NA 0.54 1.8 <0.5 2 235 4.9 <0.1 183 5.6 No of the Site drainage system, separated by a hydrologic divide. GWA-9S/D/BR, located between the source areas and AL- 1001. do not exceedkr n for strontium. AL-S005 01/01/2016 <0.5 <0.1 <0.1 <25 <0.08 1.6 1.6 <0.1 <50 NA 0.85 <0.5 <0.5 <0.5 80.9 <2 <0.1 65 4.3 No Northwest and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated bv a h drolo is divide. AL-1006 01/01/2016 <0.5 0.99 <0.1 <25 <0.08 0.2 <0.5 <0.1 <50 NA <0.5 1.8 <0.5 0.96 121 3.7 3 <0.1 <0.1 118 127 3.9 No No All COls are below com arative criteria West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1007 01/01/2016 <0.5 <0.1 <0.1 <25 <0.08 3 3.1 <0.1 112 NA 2.6 <0.5 <0.5 <0.5 280 of the Site draina e s stem al0n a h drolo is divide. AL-1008 01/01/2016 <0.5 <0.1 <0.1 <25 <0.08 1.8 2.2 <0.1 <50 NA 1.3 <0.5 <0.5 <0.5 168 2.2 <0.1 108 6.7 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated bv a h drolo is divide. AL-1009 01/01/2016 <0.5 0.12 <0.1 <25 <0.08 0.82 1.4 <0.1 <50 NA 0.91 <0.5 <0.5 <0.5 202 <2 <0.1 139 5.4 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated bv a h drolo is divide. AL101 05 22 2015 <0.5 <0.5 <0.2 <5 <0.08 0.61 2.9 <0.5 <50 NA 6.9 <0.5 1.6 <0.5 72.5 <0.002 <0.1 40 4 No All COls are below comparative criteria AL-1010 01/01/2016 <0.5 0.12 <0.1 <25 <0.08 5.9 5.8 <0.1 <50 NA 1.1 <0.5 <0.5 <0.5 145 <2 <0.1 106 5.5 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated bv a h drolo is divide. AL-1011 01/01/2016 <0.5 0.12 <0.1 <25 <0.08 2.8 2.7 <0.1 <50 NA 2 <0.5 <0.5 <0.5 146 <2 <0.1 93 5.9 No South and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated b a h drolo is divide. AL-1012 01/01/2016 <0.5 1.1 <0.1 <25 <0.08 0.047 0.92 <0.1 <50 NA 2.5 3 0.83 <0.5 249 10.3 <0.1 98 0.6 1 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e system, separated bv a h drolo is divide. AL-1013 Ol/Ol/2016 <0.5 3.1 <0.1 <25 <0.08 0.09 <0.5 <0.1 <50 NA <0.5 2.8 <0.5 <0.5 277 6.2 <0.1 137 4.2 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated b a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1014 01/01/2016 <0.5 0.1 <0.1 <25 <0.08 0.31 0.6 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 210 2.1 <0.1 128 6.7 No of the Site drainage system, separated by a hydrologic divide. GWA-9S/D/BR, located between the source areas and AL- 1014 do not exceed back round for strontium. AL-1015 01/01/2016 <0.5 1.1 <0.1 <25 <0.08 <0.03 <0.5 <0.1 <50 NA 8.4 3.9 <0.5 <0.5 162 10.5 <0.1 130 <0.3 No All COls are below com arative criteria West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1016 01/01/2016 <0.5 0.16 <0.1 <25 <0.08 2 2.2 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 184 2.3 <0.1 146 10.4 No of the Site draina e s stem se arated b a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1017 01/01/2016 <0.5 0.822 <0.1 <25 <0.08 0.058 5.6 0.1 968 NA 14 4 1.2 <0.5 256 6.4 <0.1 116 3.5 No of the Site draina e s stem se arated b a h drolo is divide. AL-1018 01 01 2016 <25 0.1 <0.1 3870 N <0.5 O6 3.4 <0.1 1 No Invalid dataset' H or turbidit issues West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL102 04/29/2015 <0.5 <0.5 <0.2 9.5 <0.08 1.4 2.6 <0.5 <50 NA <0.5 <0.5 0.79 <0.5 116 <2 <0.1 109 9 No of the Site draina e s stem alon a h drolo is divide. South and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1020 01/01/2016 <0.5 0.17 <0.1 <25 <0.08 0.15 0.58 <0.1 405 NA 5.2 <0.5 <0.5 <0.5 228 <2 <0.1 145 5.9 No of the Site draina e s stem separated b a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1021 Ol/Ol/2016 <0.5 0.12 <0.1 <25 <0.08 0.58 0.81 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 204 <2 <0.1 111 3.6 No of the Site draina e s stem se arated b a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1022 01/01/2016 <0.5 1.4 <0.1 <25 <0.08 0.067 <0.5 <0.1 <50 NA <0.5 2 <0.5 <0.5 96.7 6.4 <0.1 112 16.3 No of the Site drainage s stem se arated b a h drolo is divide. AL-1023 01/01/2016 <0.5 <0.1 <0.1 <25 <0.08 0.71 0.99 <0.1 <50 NA 1.6 <0.5 <0.5 1 <0.5 134 <2 <0.1 92 4.5 No All COls are below comparative criteria West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1024 01/01/2016 <0.5 1.8 <0.1 <25 <0.08 0.23 0.75 <0.1 69.8 NA 3 2.9 <0.5 0.77 297 4.9 <0.1 145 14.8 No of the Site drainage s stem separatedb a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL-1025 01/01/2016 <0.5 0.24 <0.1 <25 <0.08 2.2 3.7 <0.1 <50 NA 0.57 0.82 <0.5 <0.5 139 1.2 <0.1 110 10.3 No of the Site draina e s stem se arated 'IV a h drolo is divide. AL-1026 01/01/2016 <0.5 1 0.67 <0.1 1 <25 <0.08 0.45 0.83 <0.1 119 NA 3 1.4 <0.5 0.56 122 3 <0.1 83 11 No All COIs are below comparative criteria AL-1027 O3 O3 2016 <O.5 0.16 <0.1 <25 <0.08 0.11 <0.5 <0.1 <50 NA <0.5 0.78 <0.5 <0.5 136 4.5 <0.1 123 11.9 No All COIs are below co m arative criteria AL103 02 25 2015 0.078 <1 <1 <500 0.22 <10 7.2 0.74 2700 NA 3.6 0.7 3.6 <1 110 <1 <1 120 9.1 No Invalid dataset• H or turbidit issues AL11 03/17/2015 <3 <10 <1 <100 <1 <20 2.28 <5 <50 NA <10 <10 <10 <10 135 <10 <1 104 4.35 1 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alono a h drolo is divide. AL11 OS 08 2015 <0.5 <0.5 <0.2 <5 <0.08 1.6 2.6 <0.5 <50 NA <0.5 <0.5 0.64 <0.5 153 2.2 <0.1 118 5.2 AL110 01 18 2015 <0.5 <0.5 <0.2 <5 <0.08 1.7 2.1 <0.5 <50 NA <0.5 1 1 <0.5 <0.5 110 2 <0.1 110 11.3 No West and UlDoradient of the Site. Not within the direction of oroundwater flow from the ash basins oLS21LUU21. ALSll 02/19/2015 0.1 <1 <1 43 0.067 <10 0.8 0.068 <50 NA 2 <2 0.7 <1 110 0.6 0.063 140 9.5 No All COls are below comparative criteria ALl11 07 30 2015 <0.5 <0.5 <0.2 <5 <0.08 1.1 1 1.3 <0.5 1 <50 NA 1 1.2 <0.5 0.56 <0.5 120 2.8 <0.1 109 10.4 West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL112 04/28/2015 <0.5 1.2 <0.2 9.2 <0.08 0.05 <0.5 <0.5 <50 NA 0.65 2.9 <0.5 0.71 187 6.5 <0.1 144 4 No of the Site draina e s stem se pa rated b a hydrologic divide. AL113 04/28/2015 <0.5 <0.5 <0.2 <5 <0.08 2 2.8 <0.5 <50 NA 0.66 0.64 <0.5 <0.5 169 2.2 <0.1 108 11.4 No All COIs are below comparative criteria AL114 04/28/2015 <0.5 <0.5 <0.2 <5 <0.08 2.2 2.7 <0.5 <50 NA 0.97 0.64 <0.5 <0.5 162 2.3 <0.1 128 10.5 No All COls are below comparative criteria West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL115 04/28/2015 <0.5 0.82 <0.2 38.8 <0.08 0.16 0.63 <0.5 238 NA 23.9 2.7 0.89 <0.5 3400 373 <0.1 675 5.3 No of the Site drainage system, separated b a h drolo is divide. AL117 03/23/2015 0.089 <1 <1 120 <1 <10 1.4 0.11 200 NA 3.5 1.1 1.6 1 440 34 <1 270 5.1 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated by a h drolo is divide. ALS 17 07 31 2015 <0.5 <0.5 <0.2 42 <0.08 0.15 0.95 <0.5 118 NA 2.6 0.68 1.2 1.8 463 38.3 <0.1 254 5.4 AL118 02/10/2015 <1 <5 <1 <100 <0.1 <10 2 <1 <50 NA <5 <5 <5 <5 230 1.09 <0.1 106 6 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage system, alonga hydrologic divide. AL118 28,053,2015 <0.5 <0.5 <0.2 <5 <0.08 2.3 2.8 <0.5 <50 NA <0.5 <0.5 1.1 <0.5 183 <2 <0.1 107 10.6 AL119 04 22015 <0.5 1.2 <0.2 7.4 <0.08 0.056 1.3 <0.5 144 NA 6.6 3.4 0.81 <0.5 129 5.6 <0.1 114 3.1 No All COls are below comparative criteria West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL12 04/27/2015 <0.5 <0.5 <0.2 <5 <0.08 1.5 1.7 <0.5 <50 NA 0.8 <0.5 <0.5 <0.5 286 4.5 <0.1 146 2.4 No of the Site draina e s stem alon a h drolo is divide. AL120 04 29 2015 <0.5 1.1 <0.2 15.8 <0.08 <0.03 <0.5 <0.5 <50 NA 8.9 3.6 <0.5 <0.5 162 11.2 <0.1 128 <1 No All CO[s are below comparative criteria West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL121 05/19/2015 <0.5 <0.5 <0.2 <5 <0.08 1.7 2 <0.5 <50 NA 1 <0.5 <0.5 <0.5 67.1 <2 <0.1 73 13.1 No of the Site draina e s stem se arated b a h drolo is divide. AL122 05/19/2015 <0.5 <0.5 <0.2 <5 <0.08 0.25 0.66 4300 NA 2.7 <0.5 285 <2 <0.1 129 8.4 No Invalid dataset; pH or turbidity issues AL122 08 14 2015 <0.5 <0.5 <0.2 <5 <0.08 0.21 0.56 2100 NA 2 <0.5 248 <2 <0.1 117 6.3 AL123 OS 15 2015 <0.5 <0.5 <0.2 <5 <0.08 2 2.2 <0.5 <50 NA 0.74 <0.5 1.1 <0.5 173 <2 <0.1 160 7.6 No All COls are below com arative criteria AL124 01 21 2011 <0.5 <0.5 <0.2 <5 <0.08 1 1.1 <0.5 <50 NA <0.5 0.56 <0.5 <0.5 198 2.6 <0.1 133 9.3 No South and side radient of the Site. Strontium value is less than the bedrock Flow zone back round ran e. AL125 OS 18 2015 <0.5 3.6 <0.2 5.6 <0.08 <0.03 <0.5 <0.5 <50 NA 6.7 7 <0.5 <0.5 111 6.9 <0.1 97 <1 No All COls are below com arative criteria AL126 01 28 2015 <0.5 <0.5 <0.2 <5 <0.08 4.2 4.4 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 118 2.1 <0.1 103 12 No All COIs are below com arative criteria AL127 OS 19 2015 <0.5 <0.5 <0.2 <5 <0.08 4.4 5 <0.5 <10 NA <0.5 <0.5 <0.5 <0.5 130 <2 <0.1 109 10.6 No All COIs are below comparative criteria AL129 OS/20/2015 <0.5 <0.5 <0.2 <5 <0.08 0.41 0.63 <0.5 <50 NA 0.87 <0.5 <0.5 <0.5 225 2.8 <0.1 182 6.8 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated b a h drol0 is divide. Rev. 1 Page 1 of 4 23 April 2020 TABLE 6-9 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium Chromium Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Vanadium (VI) Dissolved Impacted by Coal Ash? Comments Reporting Units ug/L u9/L I u9/L u9/L ug/L ug/L u9/L ug/L 1,9/L u9/L ug/L u9/L ug/L ug/L ue/L mg/L P9/L mg/L ug/L 15A NCAC 02L Standard 1* SO 4* 700 2 SO SO 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* Background Threshold Values Bedrock Unit 0.5 2 0.1 50 0.08 0.7 9 0.3 284 NE 278 9 5 0.5 181 7 0.1 165 16 Background Threshold Values Bedrock Unit 3 2 0.1 50 0.8 10 0.3 1,242 26 360 11 7 0.5 181 7 0.1 221 13 Background Data Set Range Bedrock Unit 0.27 - 3.9 0.24 - 1.6 0.01 i - <O.1 35.6 L - <50 <0.08 % <0.025 - 0.66 0.33 L - 8.9 0.021 � - 0.31 40.7 � - 715 0.9 L - 26.3 2.8 L - 278 1.7 - 10.5 0.22 j - 5.8 0.17 L - <0.5 97.7 - 223 1.8- 33.3 0.02 � - <0.1 104 - 222 7.5 - 15.9 Sample ID Sample Analytical Results Collection Date West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL130 05/21/2015 <0.5 <0.5 <0.2 <5 <0.08 2.4 2.4 <0.5 <50 NA 1.1 <0.5 <0.5 <0.5 106 <2 <0.1 110 7.9 No of the Site drainage system, separated b a hydrologic divide. North and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL131 05/28/2015 <0.5 <0.5 <0.2 <5 <0.08 0.78 1.1 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 59.5 <2 <0.1 75 7.9 No of the Site draina e s stem se arated b a h drolo is divide. South and sidegradient of the Site. Strontium value is slightly greater than the bedrock flow zone background range, but AL132 07/30/2015 <0.5 <0.5 <0.2 <5 <0.08 0.93 0.98 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 234 2.1 <0.1 133 7.8 No is less than the shallow and dee flow zone background range. AL133 05 28 2015 <0.5 <0.5 <0.2 <5 <0.08 0.72 0.95 <0.5 273 NA 5.2 <0.5 <0.5 <0.5 89.9 <2 <0.1 99 7.4 No All COls are below comparative criteria West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL135 08/27/2015 <0.5 <0.5 <0.2 <5 <0.08 2.1 2.4 <0.5 88.6 NA 3 <0.5 <0.5 <0.5 180 2.1 <0.1 107 7 No of the Site draina e s stem se arated b a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL136 05/18/2015 <0.5 <0.5 <0.2 <5 <0.08 2.8 3.3 <0.5 52.8 NA 0.82 <0.5 0.57 <0.5 378 2.1 <0.1 233 4.5 No of the Site drainage system, stem alon a h drolo is divide. AL137 07 28 2015 <0.5 <0.5 <0.2 <5 <0.08 0.33 <0.5 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 155 4.6 <0.1 101 6.5 No All COls are below com arative criteria West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL138 08/05/2015 <0.5 <0.5 <0.2 <5 <0.08 1.2 1.4 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 215 <2 <0.1 160 6.4 No of the Site draina e s stem se arated b a h drolo is divide. AL139 07 28 2015 <0.5 <0.5 <0.2 <5 <0.08 0.64 0.81 <0.5 <50 NA 4.1 <0.5 <0.5 <0.5 81.4 2.7 <0.1 81 5.4 No All COls are below comparative criteria West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL14 02/10/2015 <1 <5 <1 <100 <0.1 5 4 <1 <50 NA <5 <5 <5 <5 360 6.92 <0.1 214 2 No of the Site draina e s stem al0n a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL140 07/28/2015 <0.5 <0.5 <0.2 <5 <0.08 2.4 2.5 <0.5 58.4 NA 2 <0.5 <0.5 <0.5 189 2.8 <0.1 151 4.7 No of the Site drainage system, alonga h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL141 07/28/2015 <0.5 <0.5 <0.2 <5 0.092 4.4 3.9 <0.5 <50 NA 1.8 <0.5 0.58 <0.5 104 <2 <0.1 98 12.8 No of the Site draina e s stem alon a h drolo is divide. AL142 08 27 2015 <0.5 <0.5 <0.2 <5 <0.08 0.079 0.89 <0.5 958 NA 21.3 <0.5 0.71 <0.5 125 <2 <0.1 105 4.9 No All COIs are below com arative criteria AL15 03/02/2015 <3 <10 <1 <100 <1 <20 <10 <5 14.5 NA <10 <10 <10 <10 222 <10 <1 138 3.68 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL15 05 19 2015 <0.5 <0.5 <0.2 10.9 <0.08 1.8 2 <0.5 <50 NA 1.8 <0.5 <0.5 <0.5 227 4.6 <0.1 156 4.8 AL16 02/10/2015 <3 <5 <1 <100 2 <1 510 NA <5 <5 <5 150 <0.1 96 West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL16 07 29 2015 <0.5 10.5 <0.2 <5 10.08 1.8 1.7 <0.5 <50 NA 0.87 <0.5 <0.5 <0.5 128 <2 <0.1 116 4.2 No of the Site drainage system, alonga hydrologic divide. AL17 02/16/2015 <3 <10 <1 <100 <1 <20 <10 <5 57.7 NA 1.37 <10 <30 <10 160 <10 <1 106 5.58 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL17 0511 2015 <0.5 <0.5 <0.2 <5 <0.08 1.1 1.4 <0.5 59.3 NA 1.7 <0.5 <0.5 <0.5 168 2.1 <0.1 130 7.8 AL19 03/02/2015 <3 <10 <1 <100 <1 <20 <10 <5 19.4 NA <10 <10 <10 <10 228 <10 <1 155 3.84 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL19 05 12 2015 <0.5 <0.5 <0.2 <5 <0.08 2.6 2.7 <0.5 <50 NA 1.1 <0.5 <0.5 <0.5 233 <2 <0.1 157 4.5 West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL2 04/29/2015 <0.5 0.64 <0.2 6.6 <0.08 1 1.5 <0.5 <50 NA 0.92 1.2 <0.5 0.66 142 3 <0.1 114 9.9 No of the Site draina e s stem se arated b a h drolo is divide. AL20 02/16/2015 <3 <10 <1 <100 <1 <20 <10 <5 <50 NA <10 <10 <10 <10 165 <10 <1 84 10.3 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL20 05 19 2015 <0.5 <0.5 <0.2 <5 <0.08 1.4 1.6 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 160 2.1 <0.1 134 12 AL-2000-RAW 10 18 2017 <0.5 0.17 <0.1 49 <0.08 0.029 2.3 <0.1 <50 NA <0.5 2.2 <0.5 0.79 2.4 105 <0.1 263 <0.3 No All COIs are below com arative criteria AL-2001-RAW 10/17/2017 <0.5 0.46 <0.1 <25 0.13 0.2 0.98 <0.1 <50 NA 0.65 1 <0.5 <0.5 207 1.5 <0.1 137 6.4 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated b a h drolo is divide. AL-2001-RAW 12 04 2017 <0.5 0.74 <0.1 <5 <0.08 0.2 <0.5 <0.1 <50 NA 0.93 1.3 <0.5 <0.5 225 2.6 <0.1 141 6 AL-2003-RAW 10/17/2017 <0.5 0.1 <0.1 <25 0.11 1.6 1.7 <0.1 <50 NA 0.54 <0.5 <0.5 <0.5 262 1.6 <0.1 90 9.7 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL-2003-RAW 12 19 2017 <0.5 <0.1 <0.1 <5 <0.08 1.5 1.7 <0. <50 NA <0.5 <0.5 <0.5 <0.5 257 1.8 <0.1 161 9.4 AL-2005-RAW 11 02 2017 <0.5 1.3 0.25 <25 <0.08 1.3 1.7 <0.1 <50 NA 1.6 4.2 <0.5 0.68 114 3.2 <0.1 102 3.5 No All COIs are below com arative criteria AL-2007-RAW 11 02 2017 <0.5 0.22 <0.1 <25 0.19 6.8 6.9 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 74.9 <1 <0.1 91 7.9 No All CO. are below com arative criteria AL-2008-RAW 11 02 2017 <0.5 0.25 0.14 <25 <0.08 1.7 2.1 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 120 <1 <0.1 109 11 No All COIs are below com arative criteria AL-2010-RAW 10 18 2017 <0.5 0.11 <0.1 <25 <0.08 1.1 2.5 <0.1 <50 NA <0.5 <0.5 1.2 <0.5 173 1.1 <0.1 121 11.9 No All COIs are below com arative criteria AL-2012-RAW 10/17/2017 <0.5 0.16 <0.1 <25 <0.08 1.7 2.5 <0.1 131 NA 5.8 0.52 0.76 <0.5 87.8 <1 <0.1 135 9.5 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage s stem separated b a hydrologic divide. AL-2012-RAW 12 19 2017 <0.5 0.18 <0.1 <5 <0.08 1.8 2.1 <0.1 <50 NA 2.4 0.53 <0.5 <0.5 89.3 <1 <0.1 91 9.1 AL-2013-RAW 10/18/2017 <0.5 0.15 <0.1 <25 <0.08 0.59 0.76 <0.1 <50 NA 1.1 <0.5 <O.5 <O.5 150 1.5 <0.1 109 10.5 No All COIs are below comparative criteria AL-2013-RAW 12 20 2017 <0.5 0.14 <0.1 <5 <0.08 0.66 0.84 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 144 1.9 <0.1 112 10.4 AL21 02/16/2015 <3 <10 <1 <100 <1 <20 <10 <5 <50 NA <10 <10 <10 <10 152 <10 <1 84 11.7 No All COls are below comparative criteria AL21 05 12 2015 <0.5 <0.5 <0.2 <5 <0.08 0.74 0.92 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 158 2.2 <0.1 119 12.6 AL22 05 21 2015 <0.5 <0.5 <0.2 <5 <0.08 0.39 0.58 <0.5 <50 NA <0.5 2.2 <0.5 <0.5 109 3.2 <0.1 133 8.9 No All COIs are below comparative criteria AL23 02/03/201, <1 <1 <0.4 <25 <0.1 <20 <5 0.79 310 NA 1.4 0.57 1.5 <1 100 0.64 <0.5 57 13 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL23 05 14 2015 <0.5 <0.5 <0.2 <5 <0.08 1.1 1.5 <0.5 <50 NA 1.1 0.54 0.51 <0.5 110 2.2 <0.1 94 13.4 AL24 02/11/2015 <1 <5 <1 <100 <0.1 <10 <1 <1 <50 NA <5 2 <5 <5 82 1.86 <0.1 99 12 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL24 08 03 2015 <0.5 <0.5 <0.2 <5 <0.08 0.77 0.89 <0.5 <50 NA <0.5 2.5 <0.5 <0.5 80.7 3.8 <0.1 107 12.5 AL25 02/55/2015 0.081 <1 <1 <500 <1 <10 1.4 <1 <50 NA 0.63 0.14 0.24 <1 230 <1 <1 140 4.3 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL25 07 30 2015 <0.5 <0.5 <0.2 <5 <0.08 2.3 2.7 <0.5 <50 NA <0.5 <0.5 0.53 <0.5 240 <2 <0.1 143 5.3 AL26 02/16/2015 <3 <10 <1 <100 <1 <20 <10 <5 15.6 NA <10 <10 <10 <1 <10 <1 102 6.08 AL26 05 13 2015 <0.5 <0.5 <0.2 <5 <0.08 0.55 0.79 <0.5 <50 NA 0.68 <0.5 <0.5 <0.5 187 2.5 <0.1 147 7.6 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL27 02/11/2015 <1 <5 <1 <100 <0.1 <10 2 <1 <50 NA <5 <5 <5 <5 230 <1 <0.1 144 4 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL27 08 17 2015 <0.5 <0.5 <0.2 <5 <0.08 1.8 2 <0.5 <50 NA 1.2 <0.5 0.53 <0.5 221 <2 <0.1 166 4.2 AL28 02 18 2015 <0.4 0.18 <0.11 <20 <0.06 2.05 2.05 <0.03 <25 NA <0.84 0.95 0.2 <0.16 75 <5 <0.06 152 13 No West and u radient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL29 02/25/2015 0.072 <1 <1 <500 <1 <10 2.3 <1 <50 NA 0.64 0.32 0.55 <1 72 <1 <1 92 8.3 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL29 07 29 2015 <0.5 <0.5 <0.2 <5 <0.08 2.2 2.1 <0.5 <50 NA 0.65 <0.5 <0.5 <0.5 86.4 <2 <0.1 100 6.8 AL3 03/04/2015 0.2 <1 <1 49 <1 <10 1.1 0.099 100 NA 5.2 0.36 0.33 <1 74 0.15 <1 70 6.8 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem separated b a h drolo is divide. AD 07 29 2015 <0.5 <0.5 <0.2 7.1 <0.08 1.9 1.9 <0.5 <50 NA 0.54 <0.5 <0.5 <0.5 80.2 <2 <0.1 83 7.7 AL30 02/16/2015 <3 <10 <1 <100 <1 <20 2.41 <5 <50 NA <10 <10 <10 <10 210 <10 <1 113 5.07 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL30 05 15 2015 <0.5 <0.5 <0.2 <5 <0.08 3.5 3.6 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 220 <2 <0.1 122 5.8 AL31 04/09/2015 1.16 <0.08 <0.11 43 <0.06 <5 2.47 <0.02 92.8 NA 2.59 <0.11 0.5 0.22 89 <5 <0.06 88.6 22.6 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL31 08 13 2015 <0.5 <0.5 <0.2 <5 <0.08 1.7 2 <0.5 <50 NA 1.1 <0.5 <0.5 <0.5 90 <2 <0.1 70 2.9 AL32 07 29 2015 <0.5 <0.5 <0.2 <5 <0.08 2.7 2.4 <0.5 <50 NA 1.1 <0.5 <0.5 <0.5 <2 <0.1 100 2.7 No West and u radient of the Site. Not within the direction of groundwater flow from the ash basins or coal iles. AL33 02/16/2015 <3 <10 <1 <100 <1 <20 <10 <5 <50 NA <10 <10 <10 <10 119 <10 <1 52 5.38 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL33 05/15/2015 <0.5 <0.5 <0.2 <5 <0.08 4.1 4.2 <0.5 <50 NA <0.5 <0.5 0.53 <0.5 127 <2 <0.1 116 6.4 No AL34 02/16/2015 <3 '10 <1 <100 <1 <20 <10 <5 <50 NA <10 <10 <10 <10 139 <10 <1 82 8.43 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL34 05 14 2015 <0.5 <0.5 <0.2 <5 <0.08 2.3 2.6 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 146 2.2 <0.1 108 10.1 AL39 WELL A 02/17/2015 <0.5 <0.08 <0.11 <20 <0.06 <1.5 2.18 <0.03 <15 NA <0.84 3.67 0.46 <0.16 134 5 <0.06 112 3.54 No All COls are below comparative criteria AL39 WELL 07 30 2015 <0.5 <0.5 <0.2 <5 <0.08 0.78 0.84 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 103 <2 <0.1 77 2.9 AL39 WELL B 02/17/2015 <0.4 0.92 <0.11 <20 <0.06 <1.5 1.08 <0.04 <15 NA <0.43 0.16 0.26 1.81 115 <5 <0.06 212 13.1 No All COIs are below comparative criteria AL39 WELL B 07 30 2015 <0.5 0.86 <0.2 <5 <0.08 0.18 0.85 <0.5 271 NA 8.9 3.7 <0.5 1.6 124 6.5 <0.1 139 12.7 AL40 02/17/2015 0.42 <0.08 <0.11 <20 <0.06 <1.5 0.6 <0.03 15.3 NA 1.36 0.34 0.19 <0.16 71 <5 <0.06 87 3.15 No All COls are below comparative criteria AL40 08 03 2015 <0.5 <0.5 <0.2 <5 <0.08 0.19 1.1 <0.5 <50 NA 1.3 <0.5 <0.5 <0.5 68.5 <2 <0.1 64 3.4 AL41 05 21 2015 <0.5 <0.5 <0.2 <5 <0.08 0.12 <0.5 <0.5 <50 NA <0.5 0.69 <0.5 <0.5 47.2 <2 <0.1 49 3.5 No All COls are below com arative criteria AL42 02/03/2015 0.14 <1 0.04 <25 <0.1 <20 <5 0.085 200 NA 0.58 0.21 0.66 <1 80 0.34 <0.5 56 2.9 No All COls are below comparative criteria AL42 05 15 2015 <0.5 <0.5 <0.2 <5 <0.08 0.72 0.89 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 80.3 <2 <0.1 62 3.6 AL44 04/24/2015 <0.5 <0.5 <0.2 26.9 <0.08 0.17 <0.5 1.4 <50 NA 9.2 <0.5 1.1 <0.5 31.8 <2 <0.1 63 <1 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL45 02/03/2015 0.31 <1 0.064 <25 <0.1 <20 0.74 0.089 1400 NA 4.1 0.39 0.77 <1 80 <1 <0.5 61 8.2 1No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage system, alon a hydrologic divide. AL45 05 15 2015 <0.5 <0.5 <0.2 <5 <0.08 0.69 0.89 <0.5 <50 NA 0.6 <0.5 <0.5 <0.5 77 <2 <0.1 74 5.3 AL47 02/11/201, <1 <5 <1 <100 <0.1 <10 2 <1 <50 NA <5 <5 <5 <5 240 1.02 <0.1 167 4 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage system. alonga h drolo is divide. AL47 10 22 2015 <0.5 <0.5 <0.2 <5 <0.08 2.2 2.6 <0.5 70.9 NA 2.6 <0.5 <0.5 <0.5 276 <2 <0.1 229 3.6 AL48 02/20/2015 0.5 8 40 00 NA 0.14 <1 160 1.8 0.08 100 16 West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL48 08 17 2015 <0.5 <0.5 <0.2 <5 <0.08 3.8 4.4 <0.5 <50 NA 2.5 <0.5 <0.5 <0.5 158 4 <0.1 109 6.1 No of the Site draina e system, alon a h drolo is divide. Rev. 1 Page 2 of 23 April 2020 TABLE 6-9 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium Chromium Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Vanadium (VI) Dissolved Impacted by Coal Ash? Comments Reporting Units ug/L 1,9/L 1,9/L 1,9/L ug/L ug/L 1,9/L ug/L 1,9/L 1,9/L ug/L u9/L ug/L ug/L ug/L mg/L ug/L mg/L ug/L SSA NCAC 02L Standard 1* SO 4* 700 2 SO SO 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* Background Threshold Values Bedrock Unit 0.5 2 0.1 50 0.08 0.7 9 0.3 284 NE 278 9 5 0.5 181 7 0.1 165 16 Background Threshold Values Bedrock Unit 3 2 1 0.1 50 0.8 10 0.3 1,242 26 360 11 7 0.5 181 7 0.1 221 13 Background Data Set Range Bedrock Unit 0.27 - 3.9 0.24 - 1.6 0.01 i - <O.1 35.6 L - <50 % <0.08 <0.025 - 0.66 0.33 L - 8.9 715 0.9 L - 26.3 2.8 L - 278 1.7 - 10.5 0.22 j - 5.8 0.17 L - <0.5 97.7 - 223 1.8 - 33.3 0.02 -0.1 104 - 222 7.5 - 15.9 Sample ID Sample Analytical Results Collection Date West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL49 04/23/2015 <0.5 <0.5 <0.2 <5 <0.08 0.9 1.2 <0.5 <50 NA 0.91 <0.5 <0.5 <0.5 141 2.6 <0.1 117 12.6 1 No of the Site drainage system, along a hydrologic divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL5 02/10/2015 <1 <5 <1 <100 <0.1 4 3 <1 75 NA <5 2 <5 <5 110 1.11 <0.1 88 No of the Site draina e s stem alon a h drolo is divide. ALSO WELL A 04 29 2015 <0.5 1.5 <0.2 7 <0.08 0.21 <0.5 <0.5 <50 NA <0.5 4.3 <0.5 0.66 91.4 5.9 <0.1 125 5.5 No All COls are below comparative criteria ALSO WELL B 04 29 2015 <0.5 <0.5 <0.2 5.8 <0.08 0.24 <0.5 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 62.9 <2 <0.1 78 6.7 No All COls are below comparative criteria ALSO WELL C 04/29/2015 <0.5 <0.5 <0.2 102 <0.08 1.1 1.8 <O.5 <50 NA <0.5 <0.5 1 <0.5 133 4.9 <0.1 96 3.7 West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL50 WELL C 06 11 2015 <0.08 <0.5 <50 <0.5 NA <0.1 No of the Site draina e s stem alono a h drolo is divide. AL51 02/03/2015 <1 <1 <0.4 <25 <0.1 <20 <5 0.21 1200 NA 0.88 <10 2.1 0.31 300 <1 <0.5 160 2 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL51 OS 14 2015 <0.5 <0.5 <0.2 <5 <0.08 0.43 0.76 <0.5 <50 NA 0.58 <0.5 <0.5 <0.5 346 2 <0.1 178 2.4 AL52 02/20/2015 0.053 <1 <1 62 <1 <10 0.35 <1 <50 NA 0.76 <2 0.46 <1 240 <1 <1 130 3.2 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage system, along a h drolo is divide. AL52 07 29 2015 <0.5 <0.5 <0.2 <5 <0.08 0.12 0.71 <0.5 <50 NA 0.73 <0.5 <0.5 1 <0.5 232 <2 <0.1 1 158 3.4 AL53 02/17/2015 <0.4 0.12 <0.11 <20 <0.06 2.9 4.06 <0.03 <15 NA <0.84 <0.11 0.58 <0.16 142 <5 <0.06 75 4.3 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL54 02/03/2015 <1 <1 <0.4 <25 <0.1 <20 1.5 0.24 580 NA 3.9 <10 2.2 <1 240 2.8 <0.5 130 3 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage system, along a hydrologic divide. AL54 OS 15 2015 <0.5 <0.5 <0.2 <5 <0.08 2.9 3.2 <0.5 <50 NA 1.3 <0.5 <0.5 <0.5 251 3.8 <0.1 145 4.4 AL55 02/03/2015 0.25 0.44 <0.4 <25 <0.1 8.4 0.65 0.21 330 NA 1.4 0.27 1.2 <1 140 1 <0.5 97 6.8 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alono a h drolo is divide. AL55 10 22 2015 <0.5 <0.5 <0.2 <5 <0.08 1.5 2 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 131 2.5 <0.1 125 7.5 AL56 02/25/2015 0.12 <1 <1 66 <1 <10 4.5 0.26 920 NA 9.9 0.24 1.7 <1 230 <1 0.057 140 7.6 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL56 08 13 2015 <0.5 <0.5 <0.2 <5 <0.08 <0.03 2 2.1 7160 361 0.51 2.8 <0.5 182 2.6 <0.1 133 of the Site draina e s stem along a hydrologic divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL57 07/28/2015 <0.5 <0.5 <0.2 <5 <0.08 1 1.2 <0.5 <50 NA 1.3 <0.5 <0.5 <0.5 205 <2 <0.1 123 8.3 No of the Site draina e s stem alono a h drolo is divide. AL58 02/03/2015 0.1 0.59 <0.4 <25 <0.1 <20 <5 0.22 690 NA 3.2 0.49 2 <1 200 2.8 <0.5 120 10 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL58 OS 15 2015 <0.5 0.82 <0.2 6.6 <0.08 0.24 0.63 <0.5 <50 NA 4.4 <0.5 <0.5 <0.5 203 4.3 <0.1 137 12.2 AL59 04/23/2015 <0.5 <0.5 <0.2 <5 <0.08 2.3 2.5 <0.5 <50 NA 0.78 <0.5 <0.5 <0.5 167 <2 0.24 107 19.1 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL59 06 03 2015 <0.5 <0.5 <0.2 <5 <0.08 2.4 3 <0.5 <50 NA 1.9 <0.5 <0.5 <0.5 183 <2 <0.1 99 17.1 AL6 02/16/2012 <3 <10 <1 <100 <1 1 <20 <10 1 <5 <50 NA <10 <10 <10 <10 90.2 <10 <1 81 4.49 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL6 OS 13 2015 <0.5 <0.5 <0.2 <5 <0.08 3.2 3.5 <0.5 60.8 NA <0.5 <0.5 <0.5 <0.5 94 2.1 <0.1 86 6.4 AL60 04 27 2015 <0.5 <0.5 <0.2 <5 <0.08 5.3 5.8 <0.5 56.9 NA 8.6 <0.5 0.96 <0.5 317 <2 <0.1 197 9 No West and u gradient of the Site. Not within the direction of roundwater flow from the ash basins or coal piles. AL61 07 28 2015 <0.5 <0.5 <0.2 <5 <0.08 4.6 4.8 <0.5 <50 NA 0.57 <0.5 <0.5 <0.5 208 3.3 <0.1 148 No West and u radient of the Site. Not within the direction of oroundwater flow from the ash basins or coal Iles. AL62 02 17 2015 <0.4 0.12 <0.11 <20 <0.06 2.26 2.84 <0.03 <15 NA <0.84 0.45 0.42 <0.16 205 <5 <0.06 108 11.2 No West and u radient of the Site. Not within the direction of roundwater flow from the ash basins or coal Iles. AL63 02 17 2015 <0.5 <0.08 <0.11 <20 <0.06 1.94 3.31 0.05 435 NA 2.74 0.27 0.81 0.25 274 6 <0.06 204 7.02 No West and UDgradient of the Site. Not within the direction of oroundwater flow from the ash basins or coal piles. AL64 04/23/2015 <0.5 <0.5 <0.2 <5 <0.08 4.3 4.4 <0.5 <50 NA 1.6 <0.5 2.6 <0.5 424 <2 <0.1 233 2.8 No West and UDgradient of the Site. Not within the direction of oroundwater flow from the ash basins or coal piles. AL65 04 24 2015 <0.5 <0.5 <0.2 <5 <0.08 0.25 <0.5 <0.5 <50 NA <0.5 1.1 <0.5 0.52 180 3.2 <0.1 165 6 No All COls are below com arative criteria AL66 04 24 2011 <0.5 <0.5 <0.2 <5 <0.08 0.38 0.5 <0.5 <50 NA 3.9 <0.5 1.2 <0.5 306 <2 <0.1 160 5.3 No West and u radient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL67 02/25/2015 0.12 1 0.31 <1 1 47 <1 <10 0.72 <1 47 NA 1 2.1 1 0.72 <1 150 0.59 <1 150 12 No All COls are below comparative criteria AL67 07 29 2015 <0.5 <0.5 <0.2 5.3 <0.08 0.62 0.89 <0.5 <50 NA 0.66 1.2 <0.5 <0.5 132 3.3 <0.1 159 13.3 AL68 08 03 2015 <0.5 <0.5 <0.2 <5 <0.08 1.8 2.8 <0.5 85.9 NA 2.8 0.63 <0.5 <0.5 182 2.7 <0.1 160 15.4 No West and u radient of the Site. Not within the direction of roundwater flow from the ash basins or coal Iles. AL69 04/27/2015 <0.5 <0.5 <0.2 <5 <0.08 1.2 1.8 <0.5 75.8 NA 1.9 <0.5 <0.5 <0.5 219 <2 <0.1 141 8.4 No West and u radient of the Site. Not within the direction of roundwater flow from the ash basins or coal Iles. AL7 OS 19 2015 <0.5 <0.5 <0.2 <5 <0.08 0.97 1.2 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 180 <2 <0.1 119 10.9 No West and upgradient of the Site. Not within the direction of roundwater flow from the ash basins or coal piles. AL70 03/17/2015 <3 <10 <1 <100 <1 <20 1.8 <5 33.4 NA <10 <10 <10 <10 240 <10 <1 158 8.09 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. AL70 OS 15 2015 <0.5 <0.5 <0.2 <5 <0.08 1.6 1.8 <0.5 <50 NA <0.5 <0.5 0.57 <0.5 265 2.7 <0.1 162 9.4 AL71 OS 22 2015 <0.5 <0.5 <0.2 <5 <0.08 1 1.5 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 256 <2 <0.1 149 9.2 No West and u radient of the Site. Not within the direction of roundwater flow from the ash basins or coal piles. AL72 OS 22 2015 <0.5 <0.5 <0.2 <5 <0.08 1.1 2.5 <0.5 <50 NA 7.7 <0.5 <0.5 <0.5 265 <2 <0.1 132 5.1 No West and u radient of the Site. Not within the direction of roundwater flow from the ash basins or coal Piles. AL73 02/17/2015 <0.4 0.12 <0.11 <20 <0.06 <5 3.11 <0.03 55 NA <0.84 <0.12 0.75 <0.16 188 <5 <0.06 61 9.6 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage system, along a hydrologic divide. AL73 07 29 2015 <0.5 <0.5 <0.2 <5 <0.08 2.4 2.2 <0.5 <50 NA 0.72 <0.5 0.66 <0.5 1 181 <2 <0.1 133 9.3 West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL74 05/08/2015 <0.5 <0.5 <0.2 <5 <0.08 2 2.1 <0.5 <50 NA 2.2 <0.5 <0.5 <0.5 293 <2 <0.1 168 5.8 No of the Site draina e s stem alon a h drolo is divide. AL75 02/25/2015 0.095 <1 <1 <500 <1 <10 1.2 <1 <50 NA 1 0.17 0.26 <1 86 <1 <1 110 West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL75 08 14 2015 <0.5 <0.5 <0.2 <5 <0.08 1.7 2.1 <0.5 <50 NA 1 <0.5 <0.5 <0.5 82 <2 <0.1 99 No of the Site draina e s stem alono a h drolo is divide. AL76 02/17/2015 <0.4 0.13 <0.11 <20 <0.06 2.62 2.62 <0.03 <25 NA 1.5 <0.12 0.45 <0.16 109 <5 <0.06 87 8.34 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL77 04/24/2015 <0.5 <0.5 <0.2 <5 <0.08 0.7 1 <0.5 <50 NA 0.54 <0.5 <0.5 <0.5 238 2.5 <0.1 157 8.6 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL78 04 24 2015 <0.5 <0.5 <0.2 <5 <0.08 0.1 <0.5 <0.5 <50 NA 1 <0.5 <0.5 <0.5 86.1 <2 <0.1 70 2.1 No All COIs are below comparative criteria AL79 OS 18 2011 <0.5 <0.5 <0.2 <5 <0.08 0.33 0.6 <0.5 54.9 NA 1 0.71 <0.5 <0.5 <0.5 157 2.1 <0.1 104 4.4 No All COls are below com arative criteria AL8 03/23/2015 0.08 <1 <1 97 <1 <10 3 <1 <50 NA <5 0.4 0.55 <1 240 <1 <1 130 8.1 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage system, along a hydrologic divide. AL8 07 29 2015 <0.5 <0.5 <0.2 <5 <0.08 3.5 3.1 <0.5 <50 NA 25.9 <0.5 0.7 <0.5 237 <2 <0.1 132 8.5 West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL81 07/28/2015 <0.5 <0.5 <0.2 <5 <0.08 0.78 0.73 <0.5 <50 NA 6.5 <0.5 0.95 <0.5 228 <2 <0.1 137 2.2 No of the Site draina e s stem alon a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL82 04/27/2015 <0.5 <0.5 <0.2 <5 <0.08 0.81 1.4 <0.5 <50 NA 1.7 <0.5 0.71 <0.5 392 2.1 <0.1 223 4.7 No of the Site draina e s stem alon a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL83 05/21/2015 <0.5 <0.5 <0.2 <5 <0.08 3.5 3.5 <0.5 <50 NA 1.5 <0.5 1.3 <0.5 289 3.9 <0.1 228 9 No of the Site drainage system, stem alon a h drolo is divide. West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL84 04/27/2015 <0.5 <0.5 <0.2 <5 <0.08 0.59 0.55 <0.5 59.8 NA 15.7 <0.5 <0.5 <0.5 185 <2 <0.1 134 8.2 No of the Site draina e s stem alon a h drolo is divide. AL85 04 24 2015 <0.5 <0.5 <0.2 <5 <0.08 2.5 2.6 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 69.2 <2 <0.1 67 9.6 No All COls are below com arative criteria AL88 10 27 2015 <0.5 <0.5 <0.2 <5 <0.08 0.82 1.4 <0.5 136 NA 34.6 <0.5 0.62 <0.5 83.2 <2 <0.1 63 <1 No All COls are below com arative criteria AL89 02/25/2015 0.14 0.31 <1 67 <1 <10 2.9 <1 <50 NA 0.72 0.39 0.44 <1 120 <1 0.1 140 11 No All COls are below comparative criteria AL89 07 30 2015 <0.5 <0.5 <0.2 <5 <0.08 4 4 1 <0.5 <50 NA <0.5 <0.5 1 <0.5 1 <0.5 1 113 <2 <0.1 75 12 AL9 02/10/2015 <1 <5 <1 <100 <0.1 5 6 <1 <50 NA <5 <5 <5 <5 300 1.22 <0.1 165 7 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL90 02/11/2015 <100 <0.1 1 2100 <5 160 <1 <0.1 AL90 07 30 2015 <0.5 <0.5 1 <0.2 <5 <0.08 1.9 2.4 <0.5 283 NA 8.4 <0.5 0.72 <0.5 142 <2 <0.1 101 5.5 No South and sidegradient of the Site. All COIs are below comparative criteria AL91 04 27 2015 <0.5 <0.5 <0.2 <5 <0.08 1.5 2.1 <0.5 67.6 NA 0.5 <0.5 <0.5 <0.5 127 2 <0.1 98 12.2 No All COls are below comparative criteria AL92 02/12/2015 <1 <5 <1 <100 <0.1 <10 <1 <1 <50 NA <5 <5 <5 <5 110 <1 <0.1 65 5 No All COls are below comparative criteria AL92 08 03 2015 <0.5 <0.5 <0.2 <5 <0.08 0.46 1.2 <0.5 <50 NA 0.5 <0.5 <0.5 <0.5 125 <2 <0.1 90 5.1 AL93 02/20/2015 0.064 <1 <1 90 <1 <10 1.3 0.099 94 NA 7.7 0.77 0.68 <1 82 <1 <1 80 9.6 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage system, separated b a hydrologic divide. AL93 08 17 2015 <0.5 <0.5 <0.2 <5 <0.08 1.5 2.4 <0.5 52.3 NA 5.2 0.61 <0.5 <0.5 81.8 <2 <0.1 98 9.7 AL94 02/17/2015 <0.4 2.39 <0.11 <20 <0.06 <5 1.3 <0.03 16.3 NA <0.84 4.84 0.56 2.49 142 5 <0.06 156 26.5 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated b a h drolo is divide. AL94 08 27 2015 <0.5 2.4 <0.2 5.5 <0.08 0.18 <0.5 <0.5 <50 NA <0.5 5.1 <0.5 1.7 131 5.4 <0.1 124 24.9 AL95 OS 08 2015 7.4 <0.08 1.3 <0.5 <0.5 186 <2 <0.1 107 2.5 No Invalid dataset H or turbidit issues AL96 02/19/2015 <0.4 0.16 <0.11 <20 <0.06 <5 0.82 <0.03 <25 NA <0.84 <0.11 0.18 <0.16 141 <5 <0.06 91 6.8 No All COIs are below comparative criteria AL96 08 14 2015 <O.5 <0.5 <0.2 <5 <0.08 0.43 0.75 <0.5 <50 NA <O.5 <0.5 <O.5 <O.5 123 <2 <0.1 90 5.9 Rev. 1 Page 3of4 23 April 2020 TABLE 6-9 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium Chromium (VI) Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Dissolved Vanadium Impacted by Coal Ash? Comments Reporting Units Pg/L u9/L u9/L u9/L Pg/L Pg/L u9/L I Pg/L 1,9/L u9/L Pg/L u9/L Pg/L Pg/L ug/L mg/L ug/L mg/L Pg/L SSA NCAC 02L Standard 1* SO 4* 700 2 SO SO 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* Background Threshold Values Bedrock Unit 0.5 2 0.1 50 0.08 0.7 9 0.3 284 NE 278 9 5 0.5 181 7 0.1 165 16 Background Threshold Values Bedrock Unit 3 2 0.1 50 0.08 0.8 10 0.3 1,242 26 360 11 7 0.5 161 7 0.1 221 13 Back round Data Set Range Bedrock Unit 0.27 - 3.9 0.24 - 1.6 0.01 i - <0.1 35.6 - <50 <0.08 <0.025 - 0.66 0.33 L - 8.9 0.021 - 0.31 40.7 - 715 0.9 L - 26.3 2.8 j - 278 1.7 - 10.5 0.22 i - 5.8 0.17 - <0.5 97.7 - 223 1.8 - 33.3 0.02 - <0.1 104 - 222 7.5 - 15.9 Sample ID Sample Collection Data Analytical Results AL97 02/11/2015 <1 1 <5 1 <1 <100 <0.1 <10 <1 <1 150 NA 6 4 1 <5 <5 130 6.93 <0.1 111 0.28 No All COls are below comparative criteria AL97 08 03 2015 <0.5 1.4 <0.2 8 <0.08 <0.03 <0.5 <0.5 <50 NA 5.3 4.7 <0.5 <0.5 112 7 <0.1 102 <1 AL98 02 17 2015 <0.4 1.84 <0.11 <20 <0.06 <5 0.82 <0.03 <25 NA 6.43 3.95 0.6 <0.16 34 14 <0.06 173 0.25 No 1All COIs are below com arative criteria AL99 02/12/2015 <1 <5 <1 <100 <0.1 <10 <1 <1 <50 NA <5 <5 <5 <5 140 1.18 <0.1 73 6 No All COIs are below comparative criteria AL99 07 30 2015 <0.5 <0.5 <0.2 1 <5 <0.08 1 0.78 1 0.91 1 <0.5 1 <50 1 NA I <0.5 1 <0.5 1 <0.5 1 <0.5 1 121 1 <2 1 <0.1 1 105 1 7.1 Notes: ' - Background threshold values were calculated using data from background groundwater samples collected June 2015 to September 2017. - Background threshold values were calculated using data from background groundwater samples collected March 2011 to December 2018. Bold text - greatest comparative value - 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 - highlighted concentration indicates value is either within range of background threshold values for constituents where there is no regulatory standard/background threshold values are greater than regulatory standard, or within range of background threshold value and the regulatory standard - highlighted concentration indicates turbidity value is out of range [>10 Nephelometric Turbidity Units (NTUs)] or pH value was not measured. Results are deemed invalid. * - 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. NE - not established NA - not available mq/L - milligrams per liter pg/L - micrograms per liter Prepared by: LWD Checked by: JYT Rev. 1 23 April 2020 Page 4 of 4