121515 AECOM Duke Energy Conceptual Closure Plan Final

EXISTING ROAD

EXISTING ROAD

EXISTING ROAD

EXISTINGGRAVELROAD

EXISTING 30"RCP CULVERT

EXISTING 48"CMP CULVERT

C-101

C-107

C-103

C-104

B-111

B-102

B-104

B-102

B-110

B-103

B-105

L-4

L-5

L-6

L-7

L-8

L-9

P-102

P-101

MW-26SMW-26D

MW-27SMW-27D

MW-17DMW-17

EXISTING ROAD

EXISTING ROAD

EXISTING ROAD

EXISTING ROAD

EXISTINGGRAVEL

ROAD

EXISTING

ROAD

EXISTING

ROAD

EXISTING ROAD

EXISTING 30"

RCP CULVERT

EXISTING 48"

CMP CULVERT

EXISTING 54"

CMP CULVERT

100 YEAR

FLOODPLAINC-101

C-107

C-103

C-104

C-108

C-106

C-109

B-111

B-102

B-104

B-102

B-110

B-103

B-105

B-108

L-1

L-2

L-3

L-4

L-5

L-6

L-7

L-8

L-9

P-102

P-101

MW-26SMW-26D

MW-27SMW-27D

MW-17DMW-17

MW-5

MW-18MW-18D

MW-12

MW-11SMW-11D

MW-9

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CONSTRUCTION SEQUENCE(CONT.)

05B

;4-=1 % " =1/980-<B -=4 .-=58 /69=?<1 -80 6-802566 /98=><?/>598

1. REMOVE PRIMARY AND SECONDARY ASH BASIN OUTLET STRUCTURES AND PLUG/GROUT EXISTING PRIMARY AND SECONDARYOUTLET PIPES (STRUCTURE DECOMMISSIONING)

2. DEWATER REMAINING FREE STANDING WATER FROM SECONDARY ASH BASIN3. EXCAVATE SECONDARY ASH BASIN AND STAGE MATERIALS4. VERIFY ASH REMOVAL WITHIN SECONDARY ASH BASIN5. BEGIN EXCAVATION AND REGRADING FOR LANDFILL BASE CONSTRUCTION6. COMPLETE CONSTRUCTION OF STORMWATER MANAGEMENT CONTROLS AROUND LANDFILL EXTERIOR7. OBTAIN SECONDARY ASH BASIN DAM BREACH PERMIT8. CONSTRUCT LANDFILL BASE PERIMETER BERM9. COMPLETE LANDFILL CONSTRUCTION

;4-=1 & " ;<57-<B -=4 .-=58 -80 =><?/>?<-6 2566 -<1- /69=?<1 =5>1 <1=>9<->598

1. REMOVE CONTACT WATER FROM PRIMARY ASH BASIN TO FACILITATE ASH REMOVAL2. BEGIN EXCAVATION OF STRUCTURAL FILL AREA MATERIALS AND HAUL TO LANDFILL3. BEGIN PRIMARY ASH BASIN EXCAVATION, CONDITIONING, PLACEMENT AND COMPACTION IN LANDFILL4. IMPROVE / BUTTRESS DIVIDER DIKE AS NEEDED DURING LANDFILL CONSTRUCTION5. EXCAVATE REMAINING ASH IN STRUCTURAL FILL AREA6. EXCAVATE REMAINING ASH IN PRIMARY ASH BASIN7. REGRADE THE AREA OF THE PRIMARY ASH BASIN AND INSTALL POST-CONSTRUCTION STORMWATER CONTROLS8. LOWER PRIMARY ASH BASIN DAM TO 690-FT EL., AND USE SOILS FOR LANDFILL FINAL COVER CONSTRUCTION9. CONSTRUCT CAP LINER SYSTEM OVER LANDFILL AREA10. COMPLETE CONSTRUCTION OF POST-CLOSURE STORMWATER MANAGEMENT SYSTEM IN THE FORMER PRIMARY ASH BASIN11. REMOVE WASTEWATER TREATMENT SYSTEM

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PRIMARY ASHBASIN ACTIVE

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LANDFILL (ACTIVE)

STRUCTURAL FILLAREA (CLOSED)

PRIMARY ASHBASIN (CLOSED)

LANDFILL LINER LIMIT

SECONDARY ASH BASINCLEAN CLOSURE EXTENT

CONCEPTUAL PLANS

613180

EXISTING TRANSMISSION TOWER

EXISTING TRANSMISSION POLE

EXISTING TRANMISSION LINE

EXISTING ROAD

EXISTING RIP RAP

EXISTING VEGETATION

EXISTING SLUICE AND PROCESS PIPE

EXISTING MONITORING WELL

EXISTING PIEZOMETER

EXISTING TREE LINE

EXISTING WETLAND

EXISTING RAIL TRACKS

EXISTING PROPERTY BOUNDARY

EXISTING ASH MANAGEMENT AREA BOUNDARY

PROPOSED LANDFILL LINER LIMITS

PROPOSED STORMWATER MANAGEMENT DITCH

100-YR FLOODPLAIN

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REV

CONCEPTUAL CLOSURE PLAN — PRIMARY ASH BASIN,SECONDARY ASH BASIN AND STRUCTLIRAL FILL AREA

&ENERGY.DUKE

TOPOGRAPHY DEPICTED ON THIS DRAWING BASED ON PUHUCLY AVAILABLE 2OU LIDAR, BATHYMETRIC DATA BASED ON DATA COLLECTED BY WSP GROUP ON DECEMBER U, 2014

EXISTING SLUICEAND PROCESS PIPES

EXISTING ROAD

EXISTING ROAD

EXISTING ROAD

EXISTING ROAD

EXISTING ROAD

EXISTINGGRAVELROAD

EXISTINGOUTLETSTRUCTURE


EXISTINGROAD

EXISTING ROAD

EXISTINGROAD

EXISTING ROAD




EXISTINGCULVERT


EXISTINGMANHOLE



100 YEARFLOODPLAIN

100 YEARFLOODPLAIN

WETLAND 41.09 ACRE WETLAND 14

0.11 ACRE

WETLAND 60.02 ACRE

WETLAND 70.07 ACRE

WETLAND 80.02 ACRE

WETLAND 90.01 ACRE

WETLAND 100.17 ACRE

WETLAND 110.29 ACRE

WETLAND 120.14 ACRE

WETLAND 130.02 ACRE

WETLAND 50.05 ACRE

C-101

C-107

C-103

C-104

C-108

C-106

C-109

B-111

B-102

B-104

B-102

B-110

B-103

B-105

B-108

L-1

L-2

L-3

L-4

L-5

L-6

L-7

L-8

L-9

P-102

P-101

MW-26SMW-26D

MW-27SMW-27D

MW-17DMW-17

MW-5

MW-18MW-18D

MW-12

MW-11SMW-11D

MW-9

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SITE PLAN

AS SHOWN

06

PRIMARY ASH BASIN

SECONDARY ASH BASIN(CONCEPTUAL LANDFILL AREA)

STRUCTURAL FILL AREA

()+$*"

1. THIS DRAWING DETAILS THE OVERALL SITE INTENT FOR THIS PROJECT INCLUDING RELOCATION OFASH INTO THE PROPOSED LANDFILL AND CLOSURE BY REMOVAL OF FORMER ASH MANAGEMENTUNITS.

2. CONTRACTOR TO CONSTRUCT WASTEWATER TREATMENT FACILITY IN ACCORDANCE WITHTREATMENT REQUIREMENTS OF CLOSURE PLAN DOCUMENTS AND ASSOCIATED PERMITREQUIREMENTS.

3. THE PRIMARY ASH BASIN, SECONDARY ASH BASIN AND STRUCTURAL FILL AREA WILL BE CLOSED BYREMOVAL.

4. ROAD LOCATIONS SHOWN ARE APPROXIMATE AND EXACT LOCATIONS CAN CHANGE DUE TO FIELDCONDITIONS.

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EXISTING TOPOGRAPHIC CONTOUR



EXISTING TRANSMISSION LINE

EXISTING ROAD

EXISTING RIP RAP

EXISTING VEGETATION



EXISTING PIEZOMETER

EXISTING TREE LINE

EXISTING WETLAND



EXISTING ASH AREA MANAGEMENT BOUNDARY

EXISTING ASH AREA MANAGEMENT BOUNDARY(DASHED WHERE INFERRED)

PROPOSED ROAD

APPROXIMATE LANDFILL LINER LIMITS

46 15

66 15

66 15

PROPOSEDLAYDOWN AREA

CONCEPTUAL PLANS

66 15

66 15

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CONCEPTUAL CLOSURE PLAN — PRIMARY ASH BASIN,SECONDARY ASH BASIN AND STRUCTURAL FILL AREA

SCALE: I"=2OO'ENERGY.

f DuKE

IOPDGRAPHY DEPICTED ON THIS DRAWING BASED DN PUBLICLY AVAILABLE 2DII CIGAR, BATHYMETRIC DATA BASED ON DATA CDUUEC TED BY WSP GROUP ON DECEMBER 11, 2014



EXISTING ROAD

EXISTING ROAD

EXISTING ROAD

EXISTINGCULVERT

EXISTINGMANHOLE






0.11 ACRE

WETLAND 60.02 ACRE

WETLAND 70.07 ACRE

WETLAND 80.02 ACRE

WETLAND 90.01 ACRE

WETLAND 100.17 ACRE

WETLAND 110.29 ACRE

WETLAND 120.14 ACRE

WETLAND 130.02 ACRE

WETLAND 50.05 ACRE

100 YEARFLOODPLAIN

100 YEARFLOODPLAINC-101

C-107

C-103

C-104

C-108

C-106

C-109

B-111

B-102

B-104

B-102

B-110

B-103

B-105

B-108

L-1

L-2

L-3

L-4

L-5

L-6

L-7

L-8

L-9

P-102

P-101

MW-26SMW-26D

MW-27SMW-27D

MW-17DMW-17

MW-5

MW-18MW-18D

MW-12

MW-11SMW-11D

MW-9

MW-9MMW-9D

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SITE PREPARATION PLAN

1" = 200'

07

PRIMARYASH BASIN

SECONDARYASH BASIN

STRUCTURALFILL AREA

()+$*"

1. REFER TO EROSION AND SEDIMENT CONTROL DETAILS SHEET FOR FURTHER INFORMATION ON EROSIONAND SEDIMENT CONTROL FOR SITE USE.

2. WETLANDS TO BE MARKED WITH ORANGE CONSTRUCTION FENCING.

3. REMOVED TREES TO BE CHIPPED AND STOCKPILED AT OWNER APPROVED LOCATION.

4. REMOVED SLUICE AND PROCESS PIPING TO BE RECYCLED AT OWNER APPROVED LOCATION.

5. ASSOCIATED CONCRETE FOUNDATIONS AND OTHER UNUSABLE DEMOLITION REMAINS TO BE DISPOSED OFAT OWNER APPROVED LOCATION.

6. CONTRACTOR TO IMPROVE ACCESS ROADS AS NECESSARY FOR CONSTRUCTION EQUIPMENT.

7. PRIMARY AND SECONDARY OUTLET STRUCTURES WILL REMAIN IN OPERATION UNTIL WATER LEVELELEVATIONS REACH DESIRED LEVEL. SEE PRIMARY AND SECONDARY ASH BASIN EXCAVATION ANDDEWATERING PLANS FOR FURTHER INFORMATION.

PROPOSEDLAYDOWN AREA

47 15

67 15

67 15

17 15

CONCEPTUAL PLANS

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EXISTING ROAD

EXISTING RIP RAP

EXISTING VEGETATION



EXISTING PIEZOMETER

EXISTING TREE LINE

EXISTING WETLAND



EXISTING ASH AREA MANAGEMENT BOUNDARY

EXISTING ASH AREA MANAGEMENT BOUNDARY(DASHED WHERE INFERRED)

PROPOSED ROAD

PROPOSED TREE REMOVAL

PROPOSED ROAD REMOVAL

67 15

67 15

REV

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EX. ACCESS ROAD

)iPERMIT REQUIRED

ESIZZ3

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AND ~ISPOSE 01 EXISPROCESS PIPING AND ASSOCIA

tt(r(((((((((LC(CC~~~~~w" I; (FHl=CONCEPTUAL CLOSURE PLAN — PRIMARY ASH BASIN,SECONDARY ASH BASIN AND STRUCTUIRAL FILL AREA

SCALE: I"=200'ENERGY.

f DUKE

TOPOGRAPHY DEPICTED ON THIS DRAWING BASED ON PUBUCLY AVAILABLE 20U UIDAR, BATHYMETRIC DATA BASED ON DATA COLLECTED BY WSP GROUP ON DECEMBER U, 2014



0.11 ACRE

WETLAND 60.02 ACRE

WETLAND 70.07 ACRE

WETLAND 80.02 ACRE

WETLAND 90.01 ACRE

WETLAND 100.17 ACRE

WETLAND 110.29 ACRE

WETLAND 120.14 ACRE

WETLAND 130.02 ACRE

WETLAND 50.05 ACRE

100 YEARFLOODPLAIN

100 YEARFLOODPLAINC-101

C-107

C-103

C-104

C-108

C-106

C-109

B-111

B-102

B-104

B-102

B-110

B-103

B-105

B-108

L-1

L-2

L-3

L-4

L-5

L-6

L-7

L-8

L-9

P-102

P-101

MW-26SMW-26D

MW-27SMW-27D

MW-17DMW-17

MW-5

MW-18MW-18D

MW-12

MW-11SMW-11D

MW-9

MW-9MMW-9D

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PRE-CONSTRUCTION STORMWATERMANAGEMENT PLAN

AS SHOWN

08

PRIMARYASH BASIN

SECONDARYASH BASIN

STRUCTURALFILL AREA

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EXISTING ROAD

EXISTING RIP RAP

EXISTING VEGETATION

EXISTING WETLAND

EXISTING PIEZOMETER


EXISTING TREE LINE



EXISTING ASH MANAGEMENT AREA BOUNDARY

EXISTING ASH MANAGEMENT AREA BOUNDARY(DASHED WHERE INFERRED)

PROPOSED ROAD

PROPOSED STORMWATER DITCH

PROPOSED ROCK CHECK DAM

PROPOSED SEDIMENT TRAP

()+$*"

1. CONTRACTOR TO CONSTRUCT DITCHES IN ACCORDANCE WITH DITCH CONSTRUCTION DETAIL ONCONCEPTUAL STORMWATER MANAGEMENT CONTROLS SHEET.

2. CONTRACTOR TO CONSTRUCT ROCK CHECK DAMS IN ACCORDANCE WITH SCDHEC BMP SC-04.REFER TOEROSION AND SEDIMENT CONTROLS DETAIL SHEET FOR FURTHER INFORMATION. ROCK CHECK DAMSSHALL BE CONSTRUCTED AT APPROXIMATELY EVERY 300' ALONG PROPOSED DITCHES.

3. CONTRACTOR TO CONSTRUCT SEDIMENT TRAPS IN ACCORDANCE WITH SCDHEC BMP SC-02.REFER TOEROSION AND SEDIMENT CONTROLS DETAILS SHEET FOR FURTHER INFORMATION.

4. ALL CONSTRUCTION AREAS WITH THE POTENTIAL FOR SEDIMENT-LADEN RUN-OFF SHALL USE SILT FENCESAS NECESSARY TO CONTROL STORMWATER RUN-OFF. REFER TO THE EROSION AND SEDIMENT CONTROLDETAILS SHEET FOR FURTHER INFORMATION ON SILT FENCES.

38 15

38 15

38 15

78 15

98 16

118 16

88 15

88 15

128 16

128 16

88 15

CONCEPTUAL PLANS

108 16

138 16

108 16

138 16

108 16

138 16

108 16

138 16

108 16

138 16

REY

CONCEPTUAL CLOSURE PLAN — PRIMARY ASH BASIN,SECONDARY ASH BASIN AND STRIJCTURAL FILL AREA

SCALE: I"=2OO'ENERGY.DUKE

IOPDGRAPHY DEPICTED ON THIS DRAWING BASED DN PUBLICLY AVAILABLE 2DII LIOAR, BATHYMETRIC DATA BASED ON DATA CDLLEC TED BY WSP GROUP ON DECEMBER 11, 2014

100 YEARFLOODPLAIN

100 YEARFLOODPLAIN

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POST-CLOSURE STORMWATERMANAGEMENT PLAN

AS SHOWN

09

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EXISTING SOIL ROAD

EXISTING GRAVEL ROAD

EXISTING RIP RAP

EXISTING VEGETATION

EXISTING WETLAND


EXISTING PIEZOMETER

EXISTING TREE LINE



PROPOSED ROAD IMPROVEMENTS

PROPOSED ROAD

PROPOSED LANDFILL LINER LIMITS


()+$*"

1. THIS DRAWING REFLECTS CONCEPTUAL STORMWATER MANAGEMENT AT POST-CLOSURE CONDITIONS.

2. THE POST-CONSTRUCTION STORMWATER MANAGEMENT CONTROLS ARE CONCEPTUAL AND BASED ONPRELIMINARY CALCULATIONS. THESE CONTROLS ARE SUBJECT TO REVISION AS THE DESIGN DEVELOPS.

109 16

139 16

109 16

139 16

109 16

139 16

109 16

139 16

CONCEPTUAL PLANS

REY

CONCEPTUAL CLOSURE PLAN — PRIMARY ASH BASIN,SECONDARY ASH BASIN AND STRIJCTURAL FILL AREA

SCALE: I"=2OO'ENERGY.

f DUKE

IOPDGRAPHY DEPICTED ON THIS DRAWING BASED DN PUBLICLY AVAILABLE 2DII LIOAR, BATHYMETRIC DATA BASED ON DATA CDLLEC TED BY WSP GROUP ON DECEMBER 11, 2014



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SECONDARY ASH BASIN EXCAVATIONAND CONCEPTUAL DEWATERING PLAN

AS SHOWN

1010

CONTRACTOR STAGING ANDMATERIAL STORAGE AREA(GRADE TO WORKING SLOPE)

NOTES:

1.1. NO ASH EXCAVATION SHALL BEGIN UNTIL THE SAFETY AND DEWATERING PLANS ARE SUBMITTED BY THE CONTRACTOR,APPROVED BY DUKE ENERGY AND A THOROUGH READINESS REVIEW IS CONDUCTED. ASH EXCAVATION SHALL ONLY OCCURUNDER CONDITIONS WHERE SAFETY OF CONSTRUCTION PERSONNEL CAN BE ASSURED.

2.2. DEWATERING PLAN IS CONCEPTUAL AND FIELD CONDITIONS MAY REQUIRE CHANGES TO THE PLAN AS SHOWN. CONTRACTORTO REMOVE ASH AS NECESSARY TO ATTAIN CLOSURE BY REMOVAL. CLOSURE BY REMOVAL SHALL BE DEFINED ASEXCAVATION UNTIL VISUAL CONFIRMATION THAT ALL ASH AND COMINGLED ASH/SOIL HAS BEEN REMOVED.

3.3. CONTRACTOR TO EXCAVATE AND MAINTAIN A PERIMETER DITCH AROUND THE EDGE OF THE SECONDARY ASH BASIN. MAXIMUMALLOWABLE DEPTH OF 10'. PERIMETER DITCH SHALL BE MAINTAINED TO ALLOW FOR DRAINAGE TO THE EXCAVATION LOWPOINT. ADDITIONAL DITCHES SHALL BE INSTALLED AS NECESSARY TO FACILITATE DRAINAGE TO PERIMETER RIM DITCH.

4.4. CONTRACTOR TO INSTALL TEMPORARY STORMWATER AND DIVERSION CONTROLS AS NECESSARY TO DIRECT WATER TO THEEXCAVATION LOW POINT AND AROUND EXCAVATION AREA.

5.5. GENERAL PROGRESSION OF ASH EXCAVATION IS FROM HIGHER ELEVATIONS AND ASH BASIN PERIMETER TOWARDS SUMPAREA AS SHOWN. PROGRESSION MAY VARY BASED ON FIELD CONDITIONS.

21010151515

31010 1515

71010 1515

51010 1515

REMOVE

6.6. ASH LOCATIONS AND ASH THICKNESS WITHIN THE SECONDARY ASH BASIN ARE UNKNOWN. ASH LOCATION SHOWN ONTHIS DRAWING IS APPROXIMATE BASED ON SECONDARY ASH BASIN BOTTOM SLOPE AND OUTLET LOCATION.CONTRACTOR SHALL ASSESS ASH LOCATION AND THICKNESS PRIOR TO REMOVAL. CONTRACTOR TO CONDITION DRYASH AS NECESSARY FOR ULTIMATE PLACEMENT IN THE LANDFILL.

7.7. CONTRACTOR TO MANAGE CONTACT WATER IN THE ASH BASIN THROUGHOUT CONSTRUCTION AND TREAT (ASNECESSARY) TO THE STANDARDS AS DESCRIBED IN THE CLOSURE PLAN, TECHNICAL SPECIFICATIONS ANDAPPLICABLE NPDES PERMIT LIMITS.

8.8. ASH EXCAVATION SHALL PROCEED INCREMENTALLY IN NOMINAL 10-FT MAXIMUM INCREMENTS OR DEPTHS REQUIREDTO MAINTAIN SAFETY AND STABILITY OF ASH.

9.9. CONTRACTOR TO REMOVE AND DISPOSE OF SECONDARY OUTLET STRUCTURES UPON COMPLETION OFSTORMWATER REMOVAL.

CONCEPTUAL PLANS

81010 1515

81010 1515

31010 1515

31010 1515

31010 1515

%#$#'"





EXISTING ROAD

EXISTING RIP RAP

EXISTING VEGETATION

EXISTING WETLAND

EXISTING PIEZOMETER


EXISTING TREE LINE




CONTACT WATER CONVEYANCE TOWASTEWATER TREATMENT FACILITY

SILT FENCE

PROPOSED ROCK CHECK DAM

TEMPORARY STORMWATER DIVERSION CONTROL

DEWATERING TRENCHES

GENERAL DEWATERING FLOW DIRECTION

APPROXIMATE ASH LOCATION

CONCEPTUAL CLOSURE PLAN — PRIMARY ASH BASIN,SECONDARY ASH BASIN AND STRUCTURAL FILL AREA

I 8 ENERGY.f OuKE

SCALE: I" 100'OPOGRAPHY

DEPICTED ON THIS DRAWING BASED ON PUBLICLY AVAILABLE 2011 UDAR, BATNYMEWWC DATA BASED ON DATA IXILLECTED BY WSP GROUP ON DECEMBER 11, 2014

121515 AECOM Duke Energy Conceptual Closure Plan Final

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