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Home My WebLink AboutRoxboro_RemnantEAB_DraftClosureOptions_20180622ATTACHMENT 1 REMNANT EAST EXTENSION BASIN NARRATIVE DESCRIPTION OF OPTIONS CONSIDERED (DRAFT - 09/08/2016) DRAFT 9/8/16 Amec Foster Wheeler Table 1— REAB Closure Options Summary Feasibility Analysis - Ash Basin Closure Conceptual Design Roxboro Steam Station - Remnant of East Ash Basin (REAB) Option Description Description It is assumed that remedial stabilization will be implemented for the Divider Berm and toe of landfill prior to proceeding with closure. Ash material will be left in place to maintain passive resistance for the remedial stabilization plan as currently proposed by AECOM. Follow-up is required to confirm whether the remaining ash material will be adequate. The discharge outlet channel will be lowered by excavation of rock for site drainage. The new crest level is expected to be about Elevation 450'. The remaining ash deposits will be closed in place with an engineered cover system. Some grading and fill will be required to assure proper surface drainage in the direction of the lowered discharge outlet channel. There would be no standing water after closure (No ponding). It is assumed that the closure area cannot be used for the purpose of a stormwater retention basin with engineered cover. Construction Sequence • Stabilize the Divider Berm • Dewater • Excavate and lower the discharge outlet channel. • Place fill as needed to grade and drain the site toward the lowered discharge outlet channel. • Install engineered cover for the closure area after completion of grading. • Install stabilized surface drainage features to direct stormwater runoff into the discharge channel. Advantages • Minimal disturbance and handling of ash deposits. • Remaining ash deposits could contribute lateral stability for the remedial stabilization of Divider Berm and toe of landfill. • Lower finished grade and permanent dewatering (no ponding) could facilitate containment and/or collection of seepage and leakage (leachate) from the landfill area. • Lower finished grade and permanent dewatering (no ponding) should result in correspondingly lower groundwater level post closure. Lower groundwater levels could have potential stability benefits for the landfill. • Lower overall groundwater levels within EAB area could also result in lower finished grade along with decreased fill required for EAB closure. Page 1 of 8 DRAFT 9/8/16 Amec Foster Wheeler Table 1— REAB Closure Options Summary Feasibility Analysis - Ash Basin Closure Conceptual Design Roxboro Steam Station - Remnant of East Ash Basin (REAB) Option or Description • Excavated rock could be used for remedial stabilization or other fill purposes. Disadvantages Potential settlement of landfill area from lower groundwater level must be considered. Potential difficulty in placement of engineered cover system above expected post closure groundwater level (5' separation currently recommended). Description It is assumed that remedial stabilization will be implemented for the Divider Berm and toe of landfill prior to proceeding with closure. Ash material will be left in place to maintain passive resistance/lateral stability for the remedial stabilization plan as currently proposed by AECOM. Follow-up is required to confirm whether the remaining ash material will be adequate. The discharge outlet channel will continue to be used for site drainage without excavation. The crest level is expected to remain at Elevation 465'. For this option, the soil fill will be placed within the basin area to allow site drainage through the existing discharge outlet channel. The remaining ash deposits will then be closed in place with an engineered cover system installed on top of the soil fill. There would be no standing water after closure (No ponding). It is assumed that the closure area cannot be used for the purpose of a stormwater retention basin with engineered cover. Construction Seauence • Stabilize the Divider Berm • Dewater • Provide soil fill to raise grades for positive drainage toward the existing discharge outlet. • Install engineered cover system for the closure area after placement of fill. • Install stabilized surface drainage features to direct stormwater runoff into the existing discharge channel. Advantages No standing water after closure (no ponding) Placement of fill could be of benefit for stabilization of the separator dike and toe of landfill. • Minimal disturbance and handling of ash deposits. Page 2 of 8 DRAFT 9/8/16 Amec Foster Wheeler Table 1— REAB Closure Options Summary Feasibility Analysis - Ash Basin Closure Conceptual Design Roxboro Steam Station - Remnant of East Ash Basin (REAB) Option Description Disadvantages • Development of retention basin considered to be not feasible with engineered cover system. • Higher finished grade for closure could impact containment and/or collection of seepage and leakage (leachate) from the landfill area. • Higher finished grade with fill could result in higher overall groundwater levels after closure. • Concern for placement of engineered cover system above expected groundwater level after closure (5' separation currently recommended). We are not sure at this time if the desired GW separation can be provided with site fill approach. Description It is assumed that remedial stabilization will be implemented for the Divider Berm and toe of landfill prior to proceeding with closure; however, ash material will not be left in place to maintain passive resistance/lateral stability for the remedial stabilization plan as currently proposed by AECOM. Soil fill could be placed after ash removal for lateral stability of the Divider Berm and toe of landfill. The discharge outlet channel will be lowered by excavation of rock for site drainage. The new crest level is expected to be about Elevation 450'. The existing ash deposits, silt and impacted soil will be removed for closure. Some grading and fill will be required to assure proper surface drainage in the direction of the lowered discharge outlet channel. There would be no standing water after closure (no ponding); however, an excavated stormwater retention basin may be feasible with this option. This option is presented to represent a closure by removal approach that results in no ponded water after closure. As alternative, a similar closure by removal option could be considered without placement of soil fill to grade which would allow ponding after closure. We have assumed that Option 2B would be preferred for ponding approach. Construction Seauence • Stabilize the Divider Berm • Dewater • Remove existing ash deposits and impacted soil to required extent. • Excavate and lower the discharge outlet channel to the depth required for proper surface drainage. • Place fill as needed to grade and drain the site toward the lowered discharge outlet channel. • Install surface drainage features to direct stormwater runoff into the discharge channel (no ponding). Page 3 of 8 DRAFT 9/8/16 Amec Foster Wheeler Table 1— REAB Closure Options Summary Feasibility Analysis - Ash Basin Closure Conceptual Design Roxboro Steam Station - Remnant of East Ash Basin (REAB) Option Description Advantages • No remaining standing water after closure (no ponding). • Development of excavated retention basin possible after closure. • Lower finished grade and permanent dewatering could facilitate containment and/or collection of seepage and leakage (leachate) from the landfill area that passes through separator dike. • Lower finished grade and permanent dewatering should result in correspondingly lower groundwater levels after closure. Lower groundwater levels could have potential stability benefits for the landfill. • Lower overall groundwater levels within EAB area could also result in lower finished grade along with decreased fill required for EAB closure. • Excavated rock could be used for remedial stabilization or other fill purposes. • Excavated ash and impacted soil can used to meet grading borrow requirements elsewhere in the East Ash Basin. Disadvantages • Settlement of landfill area must be considered for lower groundwater level. Description It is assumed that remedial stabilization will be implemented for the Divider Berm and toe of landfill prior to proceeding with closure; however, ash material will not be left in place to maintain passive resistance/lateral stability for the remedial stabilization plan as currently proposed by AECOM. Soil fill could be placed after ash removal for lateral stability of the Divider Berm and toe of landfill. The discharge outlet channel will continue to be used for site drainage without excavation. The crest level is expected to remain at Elevation 465'. The existing ash deposits and impacted soil will be removed for closure. Grading and fill for surface drainage will not be required within the basin. For this option, the basin area will not be permanently drained after closure (ponding after closure). The ponded area could be used for a stormwater retention basin after completion of closure. Construction Sequence • Stabilize the Divider Berm • Dewater • Remove existing ash deposits and impacted soil to required extent. Page 4 of 8 DRAFT 9/8/16 Amec Foster Wheeler Table 1— REAB Closure Options Summary Feasibility Analysis - Ash Basin Closure Conceptual Design Roxboro Steam Station - Remnant of East Ash Basin (REAB) Option Description Place soil fill as needed for lateral stability of Divider Berm. Allow basin to refill with water. Advantages Area could be used for stormwater retention basin post closure. Excavated ash and impacted soil can be used to meet grading fill requirements for EAB closure. Disadvantages • Concern for containment and/or collection of seepage and leakage (leachate) from the landfill area with ponding after closure. • Groundwater levels will not be lowered after completion of closure. Description It is assumed that remedial stabilization will be implemented for the Divider Berm and toe of landfill prior to proceeding with closure. Ash material will be left in place to maintain passive resistance for the remedial stabilization plan as currently proposed by AECOM. Follow-up is required to confirm whether the remaining ash material will be adequate. The discharge outlet channel will be lowered by excavation of rock for site drainage. The new crest level is expected to be about Elevation 450'. Ash and impacted soil will be removed for construction of the new stabilization berm on sound foundation material. After construction of the new stabilization berm, ash, silt and impacted soil will be removed for the remainder of basin area. Soil fill material would be placed over remaining ash deposits between the new stabilization berm and Divider Berm. The area of soil fill/remaining ash would then be closed in place with an engineered cover system. An excavated channel will be required to bypass the new stabilization berm. For this option, the basin area will not be permanently drained after closure (ponding after closure). The ponded area could be used as a stormwater retention basin after closure. Construction Sequence • Stabilize the Divider Berm • Dewater • Excavate and lower the discharge outlet channel. • Excavate by-pass channel for new containment berm. • Remove existing ash deposits and impacted soil to required extent for construction of new containment berm. • Construct the new containment berm. Page 5 of 8 DRAFT 9/8/16 Amec Foster Wheeler Table 1— REAB Closure Options Summary Feasibility Analysis - Ash Basin Closure Conceptual Design Roxboro Steam Station - Remnant of East Ash Basin (REAB) Option Description • Place soil fill between the new containment berm and existing Divider berm. • Place engineered cover system over the fill area. • Install improvements in discharge channel as needed for basin overflow. • Allow basin to refill with water. Advantages • Can be used for stormwater retention basin post closure • Excavated ash and impacted soil can be used to meet grading fill requirements for EAB closure. • Excavated rock could be used for remedial stabilization or other fill purposes. • Lower water level for ponded area could result in correspondingly lower groundwater levels after completion of closure. Lower groundwater levels could have potential stability benefits for the landfill. • Lower overall groundwater levels within EAB area could also result in lower finished grade along with decreased fill required for EAB closure. • The new stabilization berm could reduce overall remedial stabilization cost for Divider Berm and toe of landfill. Disadvantages • Concern for containment and/or collection of seepage and leakage (leachate) from the landfill area with standing water in basin. Description It is assumed that remedial stabilization will be implemented for the Divider Berm and toe of landfill prior to proceeding with closure. Ash material will be left in place to maintain passive resistance for the remedial stabilization plan as currently proposed by AECOM. Follow-up is required to confirm whether the remaining ash material will be adequate. The discharge outlet channel will continue to be used for site drainage without excavation. The crest level is expected to remain at Elevation 465'. Ash and impacted soil will be removed for construction of the new stabilization berm on sound foundation material. After construction of the new stabilization berm, ash, silt and impacted soil will be removed for the remainder of basin area. Soil fill material will be placed over remaining ash deposits between the new stabilization berm and Divider Berm. The area of soil fill/remaining ash would then be closed in place with an engineered cover system. Page 6 of 8 DRAFT 9/8/16 Amec Foster Wheeler Table 1— REAB Closure Options Summary Feasibility Analysis - Ash Basin Closure Conceptual Design Roxboro Steam Station - Remnant of East Ash Basin (REAB) Option Description An excavated channel would likely be required to bypass the new stabilization berm. For this option, the basin area will not be permanently drained after closure (ponding after closure). The ponded area could be used as a stormwater retention basin after closure. Construction Sequence • Stabilize the Divider Berm • Dewater • Excavate by-pass channel for new containment berm. • Remove existing ash deposits and impacted soil to required extent for construction of new containment berm. • Construct the new containment berm. • Place soil fill between the new containment berm and existing Divider berm. • Place engineered cover system over the fill area. • Install improvements in discharge channel as needed for basin overflow. • Allow basin to refill with water. Advantages • Can be used for stormwater retention basin post closure • Excavated ash and impacted soil can be used to meet grading fill requirements for EAB closure. • The new stabilization berm could reduce overall remedial stabilization cost for Divider Berm and toe of landfill. Disadvantages The water level in ponded area will remain the same after closure; therefore, groundwater levels will not be lowered. Concern for containment and/or collection of seepage and leakage (leachate) from the landfill area with standing water in basin. Description It is assumed that remedial stabilization will be implemented for the Divider Berm and toe of landfill prior to proceeding with closure; however, ash material will not be left in place to maintain passive resistance for the remedial stabilization plan as currently proposed by AECOM. It should be noted that soil fill could be placed after ash removal by dredging for lateral stability of the Divider Berm and toe of landfill. This options represents the same general approach as Closure by Removal Option 2B except that the ash material will be removed by dredging. Page 7 of 8 DRAFT 9/8/16 Amec Foster Wheeler Table 1— REAB Closure Options Summary Feasibility Analysis - Ash Basin Closure Conceptual Design Roxboro Steam Station - Remnant of East Ash Basin (REAB) Option Description The discharge outlet channel will continue to be used for site drainage without excavation. The crest level is expected to remain at Elevation 465'. The existing ash deposits and impacted soil will be removed by dredging for closure with disposal proposed within the EAB "gingerbread man" area.. Grading and fill for surface drainage will not be required within the basin. For this option, the basin area will not be permanently drained after closure (ponding after closure). Sluice water used for dredging operations may be recirculated to manage the pond water level. We have assumed that complete dewatering of the basin area will be required at completion of dredging for inspection, removal in localized areas, and final acceptance. The ponded area could be used for a stormwater retention basin after completion of closure. Construction Sequence • Assume no temporary dewatering will be required for dredging • Stabilize the Divider Berm • Provide temporary reclaim pit facilities for sluice flow within EAB "gingerbread man" area. • Provide temporary facilities for recirculation of dredge sluice flow. • Provide temporary facilities for discharge of reclaim pit overflow to WAB (as needed). • Remove ash, silt and impacted soil from basin by dredging. • Dewater basin for final inspection and cleanup of remaining ash material for closure. • Provide soil fill as needed for remedial stabilization purposes. • Incorporate ash, silt and impacted soil material as fill for EAB closure. • Allow basin to refill with water. Advantages Area could be used for stormwater retention basin post closure. Excavated ash and impacted soil can be used to meet grading fill requirements for EAB closure. Disadvantages • Concern for containment and/or collection of seepage and leakage (leachate) from the landfill area with ponding after closure. • Groundwater levels will not be lowered after completion of closure. Page 8 of 8 Table 2 Roxboro Remnant of EAB (REAB) Closure Options Estimated Quantities Duke Energy - Roxboro Steam Station Person County, NC DRAFT Rev. B Total Estimated Total Estimated Total Estimated Estimated Option Description Ash/ Impacted Soil Ash/ Impacted Soil Rock Material Total Estimated Estimated Haul Estimated Closure Engineered Cover Material Removed Material Removed Excavated (CY) Soil Required (CY) Distance (Miles) Area (Acres) Area (Acres) (CY) (Tons) Closure Option 1A - In Place Closure (Lower Channel/No Ponding) 0 0 50,000 82,587 <1 9.4 7.0 0 0 0 189,781 <1 9.4 9.4 Closure Option 1 B - In Place Closure (Existing Channel /No Ponding) Closure Option 2A - Closure by Removal (Lower Channel/No 97,101 116,521 50,000 97,101 <1 9.4 0.0 Ponding) 97,101 116,521 0 17,500 <1 9.4 0.0 Closure Option 2B - Closure by Removal (Existing Channel/Ponding) Closure Option 3A - Hybrid (New Stabilization Berm/Lower 43,560 52,272 50,000 37,721 <1 9.4 4.0 Channel/Ponding) Closure Option 3B - Hybrid (New Stabilization Berm/Existing 43,560 52,272 5,556 43,277 <1 9.4 4.0 Channel/Ponding) Closure Option 4 - Closure by Removal (Dredging/Ponding) 97,101 116,521 0 0 <1 9.4 0.0 Table 3 Roxboro Remnant of EAB (REAB) Closure Options Evaluation Opinion of Probable Cost Summary Duke Energy - Roxboro Steam Station Person County, NC DRAFT Rev. B Ash Remaining to Total Closure Total Estimated Est Post Closure Provide Passive Est Stabilization Retention Basin Est Sediment Basin Total Estimated Option Description Estimated Cost Cost/Acre (Based Maint & Monitoring Resistance for Cost Feasible Added Cost Project Cost on Closure Area) Cost (30 years) Remedial Stabilization Closure Option 1A- In Place Closure (Lower Channel/No Ponding) $8,521,588 $ 906,552 $2,219,400 Yes $5,000,000 No $5,000,000 $18,521,588 $8,372,650 $ 890,707 $2,219,400 Yes $5,000,000 No $5,000,000 $18,372,650 Closure Option 1 B - In Place Closure (Existing Channel /No Ponding) Closure Option 2A - Closure by Removal (Lower Channel/No $8,933,562 $ 950,379 $2,219,400 No $10,000,000 Possible by $0 $18,933,562 Ponding) excavation of fill. Closure Option 2B - Closure by Removal (Existing Channel/Ponding) $4,845,729 $ 515,503 $1,944,000 No $10,000,000 Yes $0 $14,845,729 Closure Option 3A - Hybrid (New Stabilization Berm/Lower $7,558,832 $ 804,131 $2,046,000 Yes $5,000,000 Yes $0 $12,558,832 Channel/Ponding) Closure Option 3B - Hybrid (New Stabilization Berm/Existing $5,527,742 $ 588,058 $1,995,000 Yes $5,000,000 Yes $0 $10,527,742 Channel/Ponding) Closure Option 4 - Closure by Removal (Dredging/Ponding) $7,348,059 $ 781,708 $1,944,000 No $10,000,000 Yes $0 $17,348,059 ATTACHMENT 2 REMNANT EAST EXTENSION BASIN CONCEPTUAL DRAWINGS OF OPTIONS CONSIDERED (DRAFT - 09/08/2016) Duke Energy — Roxboro Steam Station DRAFT September 20, 2016 Figures Closure Options Evaluation Summary Report Rev. A Remnant of East Ash Basin (REAB) Amec Foster Wheeler Project No. 7810150347 i r j Y 4 5 6 7 8 REV. A ¢ .1i'$i. '91 t° - l ; .*. - k - -- _.. ':- .if. ,. - ,w•' ,ter.' 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SETTLING POND FGD FLUSH POND DIKE 1 EAST ASH BASIN PERMITTED/LINED LANDFILL ki —� EAST ASH BASIN APPROXIMATE b ;a WASTE BOUNDARY _ APPROXIMATE DUKE ENERGY 'PROPERTY BOUNDARY WEST ASH BASIN APPROXIMATE _ a WASTE BOUNDARYy..k.,:a a a fi LEGEND WASTE BOUNDARY DISCHARGE CHANNEL APPROXIMATE DUKE ENERGY wim PROPERTY BOUNDARY 500 0 500 1000 FT t- P Environment & .� TITLE ROXBORO ASH BASIN CLOSURE PROJECT 1rastructure REMNANT OF THE EAST ASH BASIN EXISTING DISCHARGE 4021 STIRRUP CREEK DRIVE, URHAMSUITE 100 DURHAM amec foster CLOSURE OPTIONS EVALUATION OUTLET STRUCTURES (919)381-9901 LICEN81-9901 LICENSURE: Wheeler SITE LOCATION MAP INC ENG: F-1253 FOR INC GEOLOGY:C-247 REVIEW SUBMITTAL ' SEAL SCALE: AS SHOWN DES: DMS DUKE e� �'AA, DWG TYPE: DWG DFTR: DMS ' JOB NO: 7810-15-0347 CHKD: BCL ENEK%,7Y ® DATE: 08/09/2016 ENGR: LL NOT FOR ft , CONSTRUCTION FILENAME: APPD: LL Yti � DWG SIZE FIGURE NO REVISION ANSI D A 08/09/20' 7810-15-0347 CLOSURE PLAN DMS DMS BCL LL LL REVIEWSUBMITTAL 22"x34" REAB-0.0 A REV DATE JOB NO. 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I t I + _ �- / 3 \ �- - / / / / / / \\\ \ - j - / / / -�/� \ _�_�__� ASSESSMENT REPORT, ROXBORO STEAM ELECTRIC PLANT, SEPTEMBER 2015 AND PHASE 2 // ///�// \ \ I I \\\\ \I\\ / I III I llllll I \ \ \ \ � - / \ _ \ \ - / \\ / / - - ///� // /// / + • `_ - / \\� / \ - - n / /IIIII Ir _ I / . 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PROJECT TYPE DES DFTR CHKD ENGR APPD DESCRIPTION 1] F, < 0 INCHES j 2 3 TENTHS 10 20 30 Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: REAB 0.1 September 08, 2016 03: 16: 07pm P:\Energy\Projects\Duke\ABSAT Projects-810150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Option -CAD Figure-EAB Remnant Pond Option-REAB 0.1.dwg 10 5 REV. A ,/-- TOP OF LINED LANDFILL 610 600 590 580 COMPACTED 570 ASH 560 - 1 J 550 - - LANDFILL BASE 54o LINER Z� 530 >\ - APPROX. \ - 520 EXISTING GRADE 510lz� — 1 \ COMPACTED 1 ] 500 ASH _L —_ — j \ DIVIDER BERM CREST ELEV. 480' EXISTING WATER LEVEL SHOWN 490 _ _ AT ELEV. 467' (VARIES) J ' EXISTING DISCHARGE OUTLET APPROXIMATE EXISTING GRADE 480 _ CHANNEL CREST ELEV. 465' 8 eti ASH & SILT MATERIAL 470 460 - - DAM CREST E 47 LEV.77, 450 LUICED ASH 7Z \ \ \ 440N, 430 j / /X, 420 0+00 5+00 10+00 15+00 20+00 25+00 25 BASE OF DIVIDER BERM APPROX. ELEV. 465' PROPOSED CHANNEL EXCAVATION APPROXIMATE ORIGINAL GRADE WITH CREST AT ELEV. 450' EXISTING GRADE ORIGINAL GRADE PROPOSED GRADE E/ �/�ORIGINAL FOUNDATION MATERIALS �'�(SOIL, WEATHERED ROCK) ASH MATERIALS ASH, SILT AND IMPACTED SOIL WATER SURFACE SOIL FILL ABSAT ISSUE # DATE DESIGN INCHES 1 2 3 TENTHS 10 20 30 PROFILE A HORIZONTAL SCALE: 1 "=100' VERTICAL SCALE: 1 "=20' Environment & .� Infrastructure , 4021 STIRRUP CREEK amec DRIVE, SUITE 100 oster foster (919)381-9900 (919)381-9901 wheeler LICENSURE: NC El F-1253 NC GEOLOGY:C-247 SEAL 0 It 0 04 W 610 600 590 580 570 560 550 540 530 520 510 500 490 480 470 460 450 440 430 I 420 64 TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION EXISTING CONDITIONS - SCHEMATIC PROFILE A FOR REVIEW SUBMITTAL DUKE SCALE: AS SHOWN DWG TYPE: DWG JOB ENE RGY® DATE:NO: 08/09/2016 347 NOT FOR CONSTRUCTION FILENAME: REAB-0.2.dwg DWG SIZE FIGURE NO. ANSI D 22"x34" REAB-0.2 A 08/09/2016 7810-15-0347 CLOSURE PLAN DMS DS M BCL ILL ILL REVIEW SUBMITTAL REV DATE JOB NO. PROJECT TYPE I DES IDFTRICHKDIENGRI APPD DESCRIPTION 6 7 8 9 10 I I I I I DES: DMS DFTR : DMS CHKD: BCL ENGR: ILL APPD: ILL REVISION A FT] D Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: REAB 0.2 September 08, 2016 03: 17:10pm P:\Energy\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Options\CAD Eigures\EAB Remnant Pond Options\REAB 0,2,dwg REV. A 520 510 500 490 480 470 460 450 440 430 420 410 0+00 5+00 10+00 15+00 20+00 25+00 EXISTING TOP OF ASH (APPROX.) ASSUME ORIGINAL WEIR CREST AT EL. EXISTING WATER LEVEL APPROX. EL. 467' ORIGINAL GRADE (SEE G-230112) EXISTING GRADE BOTTOM OF DISCHARGE 465' CHANNEL X\ � T ">< V/ X/ \X\/ \ X //X /X X/ N'\ //X\\/ X\/\/ A\ EXISTING ASH AND SILT MATERIAL / ORIGINAL V GRADE , � - CHANNEL EXCAVATION - SECTION B HORIZONTAL SCALE: 1 "=100' VERTICAL SCALE: 1"=20' 0 0 N W 520 510 500 490 480 470 460 450 440 430 420 100 0 100 200 FT 0 LEGEND: N - - - -EXISTING GRADE ORIGINAL GRADE PROPOSED GRADE WATER SURFACE E\</=//ORIGINAL FOUNDATION MATERIALS (SOIL, WEATHERED ROCK) ASH, SILT AND IMPACTED SOIL Environment & 10 Infrastructure , 4021 STIRRUP CREEK amec DRIVE, SUITE 100 oster foster (919)381-9900 (919)381-9901 wheeler LICENSURE: NC El F-1253 NC GEOLOGY:C-247 SEAL TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION FOR CONCEPT SKETCH DUKE SCALE: AS SHOWN DWG TYPE: DWG JOB N: ENE RGY® DATE:008/092016 347 NOT FOR A 08/29/2016 7810-15-0347 CLOSURE PLAN - - - - - DRAFT SKETCH ABSAT ISSUE # DATE DESIGN REV DATE JOB NO. PROJECT TYPE DES DFTR CHKD ENGR APPD DESCRIPTION CONSTRUCTION FILENAME: REAB-0.3.dwg DWG SIZE FIGURE NO. ANSI D 22"x34" REAB 0.3 TENTHS 10 20 30 4 5 6 7 8 9 10 1 1 1 1 1 1 INCHES 1 2 3 DES: - DFTR: - CHl - El - APPD: - REVISION A Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: REAB 0.3 September 08, 2016 03:18: 04pm P: AEn erg y\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Options\CAD Eigures\EAB Remnant Pond Options\REAB 0.3,dwg REV. A 520 510 500 490 480 470 460 450 440 430 420 410 EXISTING ASH AND SILT MATERIAL NOT SHOWN. SEE OPTIONS FOR REMAINING ASH \ EXISTING TOP OF ASH ASSUME ORIGINAL WEIR CREST AT EL. _ WATER LEVEL AFTER CHANNEL EXCAVATION SHOWN AT EL. 450' - (SEE CLOSURE OPTIONS) \ ORIGINAL GRADE (SEE G-230112) \ EXISTING GRADE BOTTOM OF DISCHARGE CHANNEL \ 465' _ PROPOSED FOUNDATION MATERIAL EXCAVATION T 7 -0.64% X X \ �' PROPOSED CREST EL. NEW 450' �/ WEIR X/ K N � ORIGINAL GRADE / X / / PROPOSED EXCAVATED CHANNEL GRADE X 0+00 5+00 10+00 15+00 20+00 25+00 LEGEND: EXISTING GRADE ORIGINAL GRADE PROPOSED GRADE E/�/ ]ORIGINAL FOUNDATION MATERIALS �' �� (SOIL, WEATHERED ROCK) ASH, SILT AND IMPACTED SOIL ROCK EXCAVATION (ASSUMED) WATER SURFACE ABSAT ISSUE # DATE DESIGN INCHES 1 2 3 TENTHS 10 20 30 CHANNEL EXCAVATION - SECTION B HORIZONTAL SCALE: 1 "=100' VERTICAL SCALE: 1"=20' Environment & 10 Infrastructure , 4021 STIRRUP CREEK amec DRIVE, SUITE 100 oster foster (919)381-9900 (919)381-9901 wheeler LICENSURE: NC El F-1253 NC GEOLOGY:C-247 0 0 N W 520 510 500 490 480 470 460 450 440 430 420 TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION FOR CONCEPT SKETCH DUKE SCALE: AS SHOWN DWG TYPE: DWG JOB N: ENE RGY® DATE:008/092016 347 NOT FOR CONSTRUCTION FILENAME: REAB-0.4.dwg DWG SIZE FIGURE NO. ANSI D 22"x34" REAB 0.4 A 08/29/2016 7810-15-0347 CLOSURE PLAN - - - - - DRAFT SKETCH REV DATE JOB NO. PROJECT TYPE I DES IDFTRICHKDIENGRI APPD DESCRIPTION 6 7 8 9 10 I I I I I DES: - DFTR: - CHKD: - ENGR: - APPD: - REVISION A Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: PROFILES September 08, 2016 03: 19: 03pm P:\Enerqy\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Options\CAD Figures\EAB Remnant Pond Options\REAB 0,4,dwg An REV. 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I PROJECT TYPE I DES IDFTRICHKDIENGRI APPD I DESCRIPTION Environment & Infrastructure 4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM (919)381-9900 (919)381-9901 LICENSURE: NC ENG: F-1253 NC GEOLOGY:C-247 SEAL .10 amec foster wheeler NOT FOR CONSTRUCTION OHE LEGEND APPROXIMATE LIMITS OF CCR BOUNDARY APPROXIMATE LIMITS OF UNLINED LANDFILL APPROXIMATE LIMITS OF LINED LANDFILL SURVEYED POND AREA SURVEYED STREAM/CHANNEL AREA EXISTING TRANSMISSION LINES DRAINAGE FLOW DIRECTION ENGINEERED COVER SOIL FILL PONDED WATER REFERENCES- 1 - ASH BASIN FACILITY BOUNDARIES TAKEN FROM SYNTERRA, COMPREHENSIVE SITE ASSESSMENT REPORT, ROXBORO STEAM ELECTRIC PLANT, SEPTEMBER 2015 AND PHASE 2 RECONSTITUTION OF ASH POND DESIGNS FINAL REPORT, REV 0, JUNE 16, 2015. BOUNDARIE ARE APPROXIMATE- 2- EXISTING TOPOGRAPHIC INFORMATION WAS PRODUCED FROM PHOTOGRAMMETRIC METHODS FROM AERIAL PHOTOGRAPHY OBTAINED ON APRIL 16, 2014 BY WSP. 00 0 200 400 IFT TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION REAB OPTION 1A PLAN FOR REVIEW SUBMITTAL DUKE ENERGY® SCALE: AS SHOWN DES: DMS DWG TYPE: DWG DFTR : DMS JOB 347 BLLL DATE:008/09 2016 ENGR: FILENAME: REAB-1A.1.dwg APPD: LL DWG SIZE I FIGURE NO. I REVISION ANSI D 22"REAB-1 A.1 A x34" 1] F71 < INCHES j 2 3 TENTHS 10 20 30 Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: REAB 1 A, I September 08, 2016 03: 20: 44pm P:\Enerqy\Projects\Duke\ABSAT Projects/7810150347 Roxboro Ash Basin Closure Plan/EAB Remnant Pond Closure Options/CAD Figures/EAB Remnant Pond Options/REAB 1 A.1.dwg 10 5 REV. A TOP OF LINED LANDFILL 610 600 590 - - APPROX. EXISTING GRADE 580 —2 /4COMPACTED 570 ASH 560 - 1 J 550 - - BASE 54o CLANDFILL LI 530 - - - ASSUMED FINAL 520 GRADE J � 510 DIVIDER BERM CREST ELEV. 480' COMPACTED 500 ASH STABILIZATION STRUCTURE 490 APPROXIMATE /\ ' EXISTING DISCHARGE OUTLET EXISTING GRADE 480 - CHANNEL CREST ELEV. 465' - - ENGINEERED ASH &SILT MATERIAL a a COVER SYSTEM (SHOW 2' DEPTH) - 0.5% - 470 \ 460 MIN. DAM CREST E 4 0' I �, 3_jz j 450 SLUICED ASH 7 \> \77Z7 \ \ 440 \ / \N \ /\N \ 430 --,47 /-�/ I IN j / / /X, / / / / / x AX 420 0+00 5+00 10+00 15+00 SOIL OR ASH FILL TO GRADE 20+00 25+00 25 BASE OF DIVIDER BERM APPROX. ELEV. 465' PROPOSED CHANNEL EXCAVATION APPROXIMATE ORIGINAL GRADE WITH CREST AT ELEV. 450' 1 r- !-% r- A I r-% . - - - -EXISTING GRADE ORIGINAL GRADE PROPOSED GRADE E/ �/�ORIGINAL FOUNDATION MATERIALS �'�(SOIL, WEATHERED ROCK) / JASH MATERIALS ASH, SILT AND IMPACTED SOIL ENGINEERED COVER SYSTEM SOIL FILL PROFILE A HORIZONTAL SCALE: 1 "=100' VERTICAL SCALE: 1 "=20' A I 08/09/2016 I 7810-15-0347 1 CLOSURE PLAN I DMS I DMS I BCL I ILL I ILL REV I DATE I JOB NO. I PROJECT TYPE I DES IDFTRICHKDIENGRI APPD REVIEW SUBMITTAL DESCRIPTION Environment & .� Infrastructure , 4021 STIRRUP CREEK amec DRIVE, SUITE 100 oster foster (919)381-9900 (919)381-9901 wheeler LICENSURE: NC ENG: F-1253 NC GEOLOGY:C-247 SEAL NOT FOR CONSTRUCTION 0 0 04 W 610 600 590 580 570 560 550 540 530 520 510 500 490 480 470 460 450 440 430 I 420 64 TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION OPTION 1A - SCHEMATIC PROFILE A FOR REVIEW SUBMITTAL DUKE ENERGY® SCALE: AS SHOWN DES: DMS DWG TYPE: DWG DFTR : DMS JOB 347 CHl DATE:NO: 08/09/2016 El ILL FILENAME: REAB-1A.2.dwg APPD: ILL DWG SIZE FIGURE NO. REVISION ANSI D 22"x34" REAB-1 A.2 A F71 D ABSAT ISSUE # DATE DESIGN INCHES 1 2 3 TENTHS 10 20 30 Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: REAB1 A.2 September 08, 2016 03: 21: 38pm P:\Enerqy\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Options\CAD Eigures\EAB Remnant Pond Option s\REAB1 A.2.dwg 10 I An REV. A / —�� G // // j/ / // // // / / — \ \\ -% , C �- ///� __ � z - � / /�� /i/ �/ � //�/ �/ %� / // / �� v� -- v \VAS //iii� — — � —� i �/ // � //� -/ ,- _/ // // //� / /� / / � v v wv �� - ' / // l/ i /ii- �/i/ / // // / / / _--__ _ �iiii/i //jam=/ i /i /� /�==�1/ 111 l / /// / //i _— vvvv ��vwV (��\(111 �i ��v/__ 'y /�� L �/i i_ /_� -/i�ii,�/ /i%�� I\\( \(\ l// /'---�vV�= _w \VA\ 1 I �_�� — /i/i // A / / /—/ // �-- / & /� -- / I I I I ( \� � l / / — \ _ A �n� �_Ay /i ,\\\! 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/ / / / - - - v _� \ \V \ I I \V A�\vv v�� v v v Av \vv VA I II II I ( \ A\ \VA v \v \ I� �/ vv \ \ \ v� v v v vvv vvv v v vA IIII vA\\ VAw V1 1V�� _�,.= /fly �� !// IMPOUNDMENT & �I II 1 I / / v __ z v 1l 1I v A :� i v �, _�(/�� r/ �1 - - - - / / II III I I I I 1 III 1 (( / / - - - \\ \\ 1 \\\VA\v v- v A vvvv v \A�\ ) II II I �A v 11 \ � - II /I� III A (( / / //�- �- v wv�__ v A\ VA(\ "_�,v A\'V I 1 AVA\\ V\\\\V�I VA\ /r / CCR BOUNDARIES I / V/ / , /i (: / - / / - / - �/ / /�540- / A \ \ \ \\ \ \ \ V \ \ ((j/ /iii �% II / / - - - / - - / ' / - / / / //I 11 I I I III VIII \ I I I ( - v vV / 1 I I I ( � �/ ��/J// \ v v A �� 1 �� II v'VA\ \ V \ \\ \VA \V (( \(\ //?,%,� v , / — / - — I \ 1 I ; I v I ; ` I'' / �A vvv ,f �� ` / \ �wvv� vv v vv vvv v vvv\ , v�` I /// /� /— I I A I I i �0 _vv_ v I I I I I///// / / — 1 I I AA \� �\\I I I II I 11 I I / / / ) J A 08/09/2016 7810-15-0347 CLOSURE PLAN DMS DMS BCL LL LL REVIEW SUBMITTAL ABSAT ISSUE # DATE DESIGN / / i, III V _ �� \� 1, � �I I I , / / / / REV DATE JOB NO. PROJECT TYPE DES DFTR CHKD ENGR APPD DESCRIPTION Environment & Infrastructure 4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM (919)381-9900 (919)381-9901 LICENSURE: NC ENG: F-1253 NC GEOLOGY:C-247 SEAL .► amec foster wheeler NOT FOR CONSTRUCTION OHE LEGEND APPROXIMATE LIMITS OF CCR BOUNDARY APPROXIMATE LIMITS OF UNLINED LANDFILL APPROXIMATE LIMITS OF LINED LANDFILL SURVEYED POND AREA SURVEYED STREAM/CHANNEL AREA EXISTING TRANSMISSION LINES DRAINAGE FLOW DIRECTION ENGINEERED COVER SOIL FILL PONDED WATER REFERENCES- 1 - ASH BASIN FACILITY BOUNDARIES TAKEN FROM SYNTERRA, COMPREHENSIVE SITE ASSESSMENT REPORT, ROXBORO STEAM ELECTRIC PLANT, SEPTEMBER 2015 AND PHASE 2 RECONSTITUTION OF ASH POND DESIGNS FINAL REPORT REV 0 JUNE 16 2015- BOUNDARIE ARE APPROXIMATE- 2- EXISTING TOPOGRAPHIC INFORMATION WAS PRODUCED FROM PHOTOGRAMMETRIC METHODS FROM AERIAL PHOTOGRAPHY OBTAINED ON APRIL 16, 2014 BY WSP- TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION REAB OPTION 1 B - PLAN FOR REVIEW SUBMITTAL DUKE ENERGY® SCALE: AS SHOWN DES: DMS DWG TYPE: DWG DFTR : DMS JOB 347 CHl DATE:008/09 2016 El ILL FILENAME: REAB-1B.1.dwg APPD: LL DWG SIZE I FIGURE NO. I REVISION ANSI ° 22"REAB-1 B. 1 A x34" 1] F1 < INCHES j 2 3 (TENTHS 10 20 30 Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: REAB1 3.1 September 08, 2016 03: 23:19pm P:\Energy\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Options\CAD Eigures\EAB Remnant Pond 0ptions\REAB1 B.1.dwg 10 5 REV. A `TOP OF LINED LANDFILL 610 600 590 - APPROX. EXISTING GRADE � 580 OMPACTED ASH 570 560 - 1 J 550 - - LANDFILL BASE 540 LINER 530 >\ - ASSUMED FINAL 520 GRADE J 510 - \ DIVIDER BERM CREST ELEV. 480' COMPACTED ] 500 ASH ENGINEERED COVER 490 STABILIZATION STRUCTURE SYSTEM (SHOW 2' DEPTH) _ _ J APPROXIMATE EXISTING GRADE J 480 _ EXISTING DISCHARGE OUTLET 0.5% ASH &SILT MATERIAL CHANNEL CREST ELEV. 465' MIN. ° , • 470 a ° d enJm . "8 `° .Q . eti G. a r vl e n.• , 9 , d • w. ti. a v . 4 � vb ti v °da• vs. ••d . . ° •°. d ° .aO .m .n • ti 8 4. ° �. ° 9 mod. 460 > DAM CRES ELEV. 4 0 450 • ' � =� _ \ \ j LUICED ASH\X \ X 440 430 N/ j / 420 0+00 5+00 10+00 15+00 SOIL FILL TO GRADE 20+00 25+00 25 PROPOSED CHANNEL EXCAVATIONWITH BASE OF DIVIDER BERM APPROX. ELEV. 465' CREST AT ELEV. 450' APPROXIMATE ORIGINAL GRADE 1 r—t-%r—k Ir1_ - - - -EXISTING GRADE ORIGINAL GRADE PROPOSED GRADE EK=///\:](SOIL, ORIGINAL FOUNDATION MATERIALS WEATHERED ROCK) E��/SASH MATERIALS ASH, SILT AND IMPACTED SOIL ENGINEERED COVER SYSTEM .."...]SOIL FILL kl I /HF'F'LIU/Al I V 1 l Ul I IVIN) PROFILE A HORIZONTAL SCALE: 1 "=100' VERTICAL SCALE: 1 "=20' A I 08/09/2016 I 7810-15-0347 1 CLOSURE PLAN I DMS I DMS I BCL I ILL I ILL REV I DATE I JOB NO. I PROJECT TYPE I DES IDFTRICHKDIENGRI APPD REVIEW SUBMITTAL DESCRIPTION Environment & .� Infrastructure , 4021 STIRRUP CREEK amec DRIVE, SUITE 100 oster foster (919)381-9900 (919)381-9901 wheeler LICENSURE: NC El F-1253 NC GEOLOGY:C-247 SEAL NOT FOR CONSTRUCTION 0 0 04 W 610 600 590 580 570 560 550 540 530 520 510 500 490 480 470 460 450 440 430 I 420 64 TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION OPTION 1 B SCHEMATIC PROFILE A FOR REVIEW SUBMITTAL DUKE ENERGY® SCALE: AS SHOWN DES: DMS DWG TYPE: DWG DFTR : DMS JOB 347 CHl DATE:NO: 08/09/2016 El ILL FILENAME: REAB-1B.2.dwg APPD: ILL DWG SIZE FIGURE NO. 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PROJECT TYPE DES DFTR CHKD ENGR APPD DESCRIPTION Environment & Infrastructure 4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM (919)381-9900 (919)381-9901 LICENSURE: NC ENG: F-1253 NC GEOLOGY:C-247 SEAL V► amec foster wheeler NOT FOR CONSTRUCTION OHE LEGEND APPROXIMATE LIMITS OF CCR BOUNDARY APPROXIMATE LIMITS OF UNLINED LANDFILL APPROXIMATE LIMITS OF LINED LANDFILL SURVEYED POND AREA SURVEYED STREAM/CHANNEL AREA EXISTING TRANSMISSION LINES DRAINAGE FLOW DIRECTION ENGINEERED COVER SOIL FILL PONDED WATER REFERENCES- 1 - ASH BASIN FACILITY BOUNDARIES TAKEN FROM SYNTERRA, COMPREHENSIVE SITE ASSESSMENT REPORT, ROXBORO STEAM ELECTRIC PLANT, SEPTEMBER 2015 AND PHASE 2 RECONSTITUTION OF ASH POND DESIGNS FINAL REPORT, REV 0, JUNE 16, 2015- BOUNDARIE ARE APPROXIMATE- 2- EXISTING TOPOGRAPHIC INFORMATION WAS PRODUCED FROM PHOTOGRAMMETRIC METHODS FROM AERIAL PHOTOGRAPHY OBTAINED ON APRIL 16, 2014 BY WSP- 00 0 200 400 FT TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION REAB OPTION 2A - PLAN FOR REVIEW SUBMITTAL ENERGY® SCALE: AS SHOWN DES: DIMSDUKE DWG TYPE: DWG DFTR : DIMS JOB 347 BLLL DATE:NO: 08/09/2016 ENGR: FILENAME: REAB-2A.l.dwg APPD: LL DWG SIZE I FIGURE NO. I REVISION ANSI 22"x34" REAB-2A.1 A 1] < INCHES j 2 3 (TENTHS 10 20 30 Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: REAB2A.1 September 08, 2016 03: 25: 46pm P: \Energ y\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Options\CAD Eigures\EAB Remnant Pond Option s\REAB2A.1.dwg 10 5 REV. A TOP OF LINED LANDFILL 610 600 590 — APPROX. EXISTING GRADE 580 COMPACTED ASH 570 560 — ) J 550 — — LANDFILL BASE 54o LINER 530 — — — ASSUMED FINAL 520 GRADE J 510 DIVIDER BERM CREST ELEV. 480' EXCAVATED RETENTION BASIN POSSIBLE COMPACTEDz <\ 500 ASH z REMOVE EXISTING ASH, SILT 490 STRUCTURE & IMPACTED SOIL. REPLACE 1zSTABILIZATION WITH SOIL FILL. EXISTING DISCHARGE OUTLET 480 — - CHANNEL CREST ELEV. 465' - a, APPROXIMATE EXISTING GRADE — — 470 0 5% I \ d• ` MIN.°. 460% . .djop e° Y •�Top _ DAM CREST EV. 470' e. 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I PROJECT TYPE I DES IDFTRICHKDIENGRI APPD REVIEW SUBMITTAL DESCRIPTION Environment & .� Infrastructure , 4021 STIRRUP CREEK amec DRIVE, SUITE 100 oster foster (919)381-9900 (919)381-9901 wheeler LICENSURE: NC El F-1253 NC GEOLOGY:C-247 SEAL NOT FOR CONSTRUCTION 0 0 04 W 610 600 590 580 570 560 550 540 530 520 510 500 490 480 470 460 450 440 430 I 420 64 TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION OPTION 2A - SCHEMATIC PROFILE A FOR REVIEW SUBMITTAL DUKE ENERGY® SCALE: AS SHOWN DES: DMS DWG TYPE: DWG DFTR : DMS JOB 347 CHl DATE:NO: 08/09/2016 El ILL FILENAME: REAB-2A.2.dwg APPD: ILL DWG SIZE FIGURE NO. REVISION ANSI D 22"x34" REAB-2A.2 A 9 10 I F71 D Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: REAB2A.2 September 08, 2016 03: 26: 48pm P:\Energy\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Options\CAD Figures\EAB Remnant Pond Option s\REAB2A.2.dwg An REV. 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I PROJECT TYPE I DES IDFTRICHKDIENGRI APPD I DESCRIPTION Environment & Infrastructure 4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM (919)381-9900 (919)381-9901 LICENSURE: NC ENG: F-1253 NC GEOLOGY:C-247 SEAL .10 amec foster wheeler NOT FOR CONSTRUCTION OHE LEGEND APPROXIMATE LIMITS OF CCR BOUNDARY APPROXIMATE LIMITS OF UNLINED LANDFILL APPROXIMATE LIMITS OF LINED LANDFILL SURVEYED POND AREA SURVEYED STREAM/CHANNEL AREA EXISTING TRANSMISSION LINES DRAINAGE FLOW DIRECTION ENGINEERED COVER SOIL FILL PONDED WATER REFERENCES- 1 - ASH BASIN FACILITY BOUNDARIES TAKEN FROM SYNTERRA, COMPREHENSIVE SITE ASSESSMENT REPORT, ROXBORO STEAM ELECTRIC PLANT, SEPTEMBER 2015 AND PHASE 2 RECONSTITUTION OF ASH POND DESIGNS FINAL REPORT, REV 0, JUNE 16, 2015- BOUNDARIE ARE APPROXIMATE- 2- EXISTING TOPOGRAPHIC INFORMATION WAS PRODUCED FROM PHOTOGRAMMETRIC METHODS FROM AERIAL PHOTOGRAPHY OBTAINED ON APRIL 16, 2014 BY WSP- TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION REAB OPTION 213 & 4 - PLAN FOR REVIEW SUBMITTAL DUKE ENERGY® SCALE: AS SHOWN DES: DMS DWG TYPE: DWG DFTR : DMS JOB 347 CHl DATE:NO: 08/09/2016 ElIll ILL FILENAME: REAB-2B.1.dwg APPD: ILL DWG SIZE I FIGURE NO. I REVISION ANSI 22"x34" REAB-2B.1 A 1] < INCHES j 2 3 TENTHS 10 20 30 Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: REAB 2B. I September 08, 2016 03: 28: 31 pm P:\Energy\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure Plan\EAB Remnant Pond Closure Options\CAD Figures\EAB Remnant Pond Options\REAB 2B. I.dwg 10 5 REV. A TOP OF LINED LANDFILL 610 600 590 - APPROX. EXISTING GRADE 580 COMPACTED 570 ASH 560 - ) J 550 - - LANDFILL BASE 54o LINER 530 - - - ASSUMED FINAL 520 GRADE J 510 DIVIDER BERM CREST ELEV. 480' 500 COMPACTED STABILIZATION STRUCTURE ASH 7 T i SOIL FILL AS NEEDED 490 FOR LATERAL STABILITY - WATER LEVEL AFTER CLOSURE AT ASH, SILT &IMPACTED \ - EXISTING DISCHARGE OUTLET ELEV. 465' (VARIES) SOIL TO BE REMOVED 480 CHANNEL CREST ELEV. 465' - - - - APPROXIMATE EXISTING GRADE 470 a `. \ 460 ;. DAM CREST ELEV. 4/ 0' 450 SLUICEDASH 7Oil- 440 Xx 430 >1\ j 420 0+00 5+00 10+00 15+00 20+00 25+00 25 [PROPOSED BASE OF DIVIDER BERM APPROX. ELEV. 465'J CHANNEL EXCAVATION WITH APPROXIMATE ORIGINAL GRADE EXISTING GRADE ORIGINAL GRADE PROPOSED GRADE ORIGINAL FOUNDATION MATERIALS (SOIL, WEATHERED ROCK) ASH MATERIALS �T� J ASH, SILT AND IMPACTED SOIL WATER SURFACE SOIL FILL e� n ABSAT ISSUE # DATE DESIGN INCHES 1 2 3 TENTHS 10 20 30 CREST AT ELEV. 450' (NOT APPLICABLE TO THIS OPTION) A 1 08/09/2016 REVI DATE PROFILE A HORIZONTAL SCALE: 1 "=100' VERTICAL SCALE: 1 "=20' 7810-15-0347 CLOSURE PLAN I DMS I DMS I BCL I ILL I ILL JOB NO. PROJECT TYPE I DES IDFTRICHKDIENGRI APPD REVIEW SUBMITTAL DESCRIPTION Environment & .� Infrastructure , 4021 STIRRUP CREEK amec DRIVE, SUITE 100 oster foster (919)381-9900 (919)381-9901 wheeler LICENSURE: NC El F-1253 NC GEOLOGY:C-247 SEAL NOT FOR CONSTRUCTION 0 0 04 W 610 600 590 580 570 560 550 540 530 520 510 500 490 480 470 460 450 440 430 I 420 64 TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION OPTION 213 - SCHEMATIC PROFILE A FOR REVIEW SUBMITTAL DUKE ENERGY® SCALE: AS SHOWN DES: DMS DWG TYPE: DWG DFTR : DMS JOB 347 CHl DATE:NO: 08/09/2016 El ILL FILENAME: REAB-2B.2.dwg APPD: ILL DWG SIZE FIGURE NO. REVISION ANSI D 22"x34" REAB-2B.2 A 9 10 I F71 D Plotted By: Rahie, Boyd Sheet Set: EAB Remnant Pond Options Layout: REAB2B.2 September 08, 2016 03: 29: 34pm P:\Energy\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Options\CAD Eigures\EAB Remnant Pond 0ptions\REAB2B.2 dwg An REV. 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I PROJECT TYPE I DES IDFTRICHKDIENGRI APPD REVIEW SUBMITTAL DESCRIPTION Environment & .� Infrastructure , 4021 STIRRUP CREEK amec DRIVE, SUITE 100 oster foster (919)381-9900 (919)381-9901 wheeler LICENSURE: NC El F-1253 NC GEOLOGY:C-247 SEAL NOT FOR CONSTRUCTION 0 0 04 W 610 600 590 580 570 560 550 540 530 520 510 500 490 480 470 460 450 440 430 I 420 64 TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION OPTION 3A - SCHEMATIC PROFILE A FOR REVIEW SUBMITTAL DUKE ENERGY® SCALE: AS SHOWN DES: DMS DWG TYPE: DWG DFTR : DMS JOB 347 CHl DATE:NO: 08/09/2016 El ILL FILENAME: REAB-3A.2.dwg APPD: ILL DWG SIZE FIGURE NO. REVISION ANSI D 22"x34" REAB-3A.2 A 9 I 10 I F71 D Plotted By: Rahie, Roya Sheet Set: EAB Remnant Pond Options Layout: REAB3A.2 September 08, 2016 03: 32: 04pm P:\Energy\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Options\CAD Figures\EAB Remnant Pond Option s\REAB3A.2.dwg An REV. 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I PROJECT TYPE I DES I DFTR I CHKD I ENGR I APPD I DESCRIPTION Environment & Infrastructure 4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM (919)381-9900 (919)381-9901 LICENSURE: NC ENG: F-1253 NC GEOLOGY:C-247 SEAL .10 amec foster wheeler NOT FOR CONSTRUCTION OHE LEGEND APPROXIMATE LIMITS OF CCR BOUNDARY APPROXIMATE LIMITS OF UNLINED LANDFILL APPROXIMATE LIMITS OF LINED LANDFILL SURVEYED POND AREA SURVEYED STREAM/CHANNEL AREA EXISTING TRANSMISSION LINES DRAINAGE FLOW DIRECTION ENGINEERED COVER SOIL FILL PONDED WATER REFERENCES- 1 - ASH BASIN FACILITY BOUNDARIES TAKEN FROM SYNTERRA, COMPREHENSIVE SITE ASSESSMENT REPORT, ROXBORO STEAM ELECTRIC PLANT, SEPTEMBER 2015 AND PHASE 2 RECONSTITUTION OF ASH POND DESIGNS FINAL REPORT, REV 0, JUNE 16, 2015- BOUNDARIE ARE APPROXIMATE- 2- EXISTING TOPOGRAPHIC INFORMATION WAS PRODUCED FROM PHOTOGRAMMETRIC METHODS FROM AERIAL PHOTOGRAPHY OBTAINED ON APRIL 16, 2014 BY WSP- TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION REAB OPTION 313 - PLAN FOR REVIEW SUBMITTAL DUKE ENERGY® SCALE: AS SHOWN DES: DMS DWG TYPE: DWG DFTR : DMS JOB 347 CHl DATE:NO: 08/09/2016 El ILL FILENAME: REAB-3B.1.dwg APPD: ILL DWG SIZE I FIGURE NO. REVISION ANSI D 22"x34" REAB-3B.1 A 1] F1 < INCHES j 2 3 )TENTHS 10 20 30 Plotted By: Rahie, Boyd Sheet Set: EAB Remnant Pond Options Layout: REAB 3B. I September 08, 2016 03: 33: 46pm P:\Energy\Projects\Duke\ABSAT Projects\7810150347 Roxboro Ash Basin Closure Plan\EAB Remnant Pond Closure Options\CAD Eigures\EAB Remnant Pond Options\REAB 3B.1.dwg 10 REV. A J J 0 z Oa aQ a Qo z_ J z 610 600 590 580 570 560 550 540 530 520 510 500 490 480 470 z 460 DAM CREST 450 rz 440 V 0 430 420 0+00 \ TOP OF LINED LANDFILL APPROX. EXISTING GRADE COMPACTED ASH LANDFILL BASE LINER ASSUMED FINAL GRAD E DIVIDER BERM CREST E EV. 4 0' STABILIZATION STRUCTURE EXCAVATE T COMPACTED ASH STABLE SLO E - NEW STABILIZATION EXISTING DISCHARGE OUTLET BERM ASH, SILT & IMPACTED SOIL TO BE REMOVED CHANNEL CREST ELEV. 465' SOIL FILL NEW EXCAVATED WATER LEVEL AFTER CLOSURE - BY-PASS CHANNEL a - AROUND EL. 465' (VARIES) APPROXIMATE ORIGINAL GRADE d ° d°h ��h . . ati:• 8 d °. G d °d d ° 4. EV. 470' SLUICED d — ASH d. G \ \ 6 4 d s 77 X\\ 5+00� ASH MATERIAL LEFT J I 10+00 BASE OF DIVIDER BERM APPROX. ELEV. 465 IN PLACE FOR L PROPOSED CHANNEL EXCAVATION LATERAL STABILITY WITH CREST AT ELEV. 450' (NOT APPLICABLE WITH THIS OPTION) EXISTING GRADE ORIGINAL GRADE PROPOSED GRADE E/ �/�ORIGINAL FOUNDATION MATERIALS �'�(SOIL, WEATHERED ROCK) E��/SASH MATERIALS ASH, SILT AND IMPACTED SOIL ENGINEERED COVER SYSTEM WATER SURFACE SOIL FILL ABSAT ISSUE # DATE DESIGN INCHES 1 2 3 TENTHS 10 20 30 15+00 APPROXIMATE ORIGINAL GRADE SECTION A HORIZONTAL SCALE, 1 "=100' VERTICAL SCALE- 1 "=20' 20+00 Environment & 10 Infrastructure , 4021 STIRRUP CREEK amec DRIVE, SUITE 100 oster foster (919)381-9900 (919)381-9901 wheeler LICENSURE: NC El F-1253 NC GEOLOGY:C-247 0 0 N W 610 600 590 580 570 560 550 540 530 520 510 500 490 480 470 460 450 440 430 TITLE ROXBORO ASH BASIN CLOSURE PROJECT REMNANT OF THE EAST ASH BASIN CLOSURE OPTIONS EVALUATION OPTION 313 - SCHEMATIC SECTION B FOR REVIEW SUBMITTAL DUKE SCALE: AS SHOWN DWG TYPE: DWG JOB N: ENE RGY® DATE:008/09/2016 347 NOT FOR CONSTRUCTION FILENAME: REAB-3B.2.dwg DWG SIZE FIGURE NO. ANSI D 22"x34" REAB-3B.2 A 08/09/2016 7810-15-0347 CLOSURE PLAN DMS DS M BCL ILL ILL REVIEW SUBMITTAL REV DATE JOB NO. PROJECT TYPE I DES IDFTRICHKDIENGRI APPD DESCRIPTION 6 7 8 9 10 I I I I I DES: DMS DFTR : DMS CHKD: BCL ENGR: ILL APPD: ILL REVISION A FT] D Plotted By: Rahie, Boyd Sheet Set: EAB Remnant Pond Options Layout: REAB 3B.2 September 08, 2016 03: 34: 41 pm P:\Energy\Projects\Duke\ABSAT Projects\781 0150347 Roxboro Ash Basin Closure PIan\EAB Remnant Pond Closure Options\CAD Eigures\EAB Remnant Pond Options\REAB 3B.2,dwg ATTACHMENT 3 REMNANT EAST EXTENSION BASIN ROUGH ORDER OF MAGNITUDE (ROM) COST ESTIMATE NOT AVAILABLE ATTACHMENT 4 REMNANT EAST EXTENSION BASIN OPTIONS ANALYSIS SCORING SUMMARY (DRAFT - 09/08/2016) APPENDIX A (WITH CLOSURE, STABILIZATION & RETENTION BASIN COST) Scoring for Evaluation of Closure Options Closure Options Evaluation Worksheet Ash Basin Closure - Master Programmatic Document Duke Energy Placeholder values have been entered in "User Input" cells to prevent division by Site Name: Roxboro Remnant of East Ash Basin (REAB) Option -Specific User Input zero error text in calculated score cells. Date: 9/8/16 10 �1= Calculated Value Threshold Criteria: All closure options must comply with the following threshold criteria based on Duke Energy Guiding Principals for Ash Basin Closure 1. Provide continued geotechnical stability meeting appropriate safety factors under applicable loading conditions 2. Provide flow capacity and erosion resistance during design storm and flooding conditions 3. Effectively mitigate groundwater impacts (in conjunction with GW remediation where present) 4. Comply with applicable state and federal regulations (e.g. North Carolina Coal Ash Management Act) Option Description 1A In Place Closure (Lower Discharge Channel/No Ponding) 1B In Place Closure (Maintain Existing Discharge Channel/fill to Grade/No Ponding) 2A Closure by Removal (Lower Discharge Channel/No Ponding) 2B Closure by Removal (Maintain Existing Discharge Channel/Ponding) 3A Hybrid Closure with New Stabilization Berm (Lower Discharge Channel/Ponding) 3B Hybrid Closure with New Stabilization Berm (Maintain Existing Discharge Channel/Ponding) 4 Closure by Removal with Dredging (Maintain Existing Discharge Channel/Same Approach as Option 2B/Ponding) Note: Options that did not meet threshold criteria should be listed in the Options Summary table above for completeness Environmental Protection and Impacts Weight: 30% Refer to This Area Not Used For Interpretation of Environmental Modeling Results Modeled surface water impact EM Sub -Scoring Sheet 21% 6.3% Refer to This Area Not Used For Interpretation of Environmental Modeling Results Modeled off -site impact EM Sub -Scoring Sheet 43% 12.9% Referto This Area Not Used For Interpretation of Environmental Modeling Results Groundwater impact beyond the waste boundary EM Sub -Scoring Sheet 21% 6.3% Interpolation. Zero miles Air emissions off -site (based on miles driven) scores 10. Truck miles driven Miles 0 669815 6 0 5 9 Interpolation. Zero gallons Air emissions on -site (based on miles driven) scores 10. Truck miles driven Miles 0 11424 10 10 Interpolation. Zero acres Disturbed acres of Avoidance of greenfield disturbance scores 10. greenfield Acres 0 23.52657025 6 0 5 9 8 8 10 5% 1.5% Weight: 35% 2.9 2.7 2.7 2.8 2.9 2.9 3.0 Cost Closure Cost Closure Cost Interpolation. Min value scores 10. Max value ($million) OM&M Cost USD $ 10.50 $ 18.90 0.5 0.6 0.0 4.9 7.5 10.0 1.9 80% 28.0% Operation, Maintenance and Monitoringscores Cost 0. ($million) USD � � $ 1.90 $ 2.20 0.0 0.0 0.0 10.0 6.7 6.7 0.1 0.2 0.0 2.1 2.6 3.3 1.2 ;Schedule ;InitiationTime Weight: 15% - - - - � - - - - - - - Interpolation Minimum Time to move first value scores 10 ash Months 4.5% Interpolation Minimum Construction Duration value scores 10 Estimated durations Months 4.4 9.9 6 0 5 9 8 8 10 70% 10.5% 1.1 0.5 0.5 0.9 0.8 0.8 1.1 Ell 1 of 2 Site Name: Roxboro Remnant of East Ash Basin (REAB) Date:9/8/16 Scoring for Evaluation of Closure Options Closure Options Evaluation Worksheet Ash Basin Closure - Master Programmatic Document Duke Energy Option -Specific User Input 1 = Calculated Value Placeholder values have been entered in "User Input' cells to prevent division by zero error text in calculated score cells. Regional Factors Weight: 15% Plan or potential for beneficial reuse of site Subjective Not Used For Subjective Scoring Interpolation Min value scores 10 Max value Imported soil needs scores 0 Soil Imported CY 0 189781 6 0 5 9 8 Interpolation. Maximum Beneficial reuse of CCR value scores 10. Fraction Used CY 97101 0 0 0 10 10 4 4 10 15% 2.3% Interpolation Min value scores 10 Max value Transportation impact (based on miles driven) scores 0 Miles Driven Miles 11424 669815 6 0 5 9 8 8 10 65% 9.8% Noise impact due to on -site activity (based on proximity of neighbors to on -site work areas) Subjective 0 to 10 Not Used For Subjective Scoring View impact (based on final height of storage facility and land uses within viewshed) Subjective 0 to 10 100.7 10 10 0 0 1 0.1 0.9 1.3 1.0 1.1 1.4 Constructability Weight: 5% Subjective 0 to 10: 10 is Consider stormwater management, geotechnical, the easiest while 0 is the Not Used For Subjective Scoring and dewatering riskiest 100% 5.0% 0.2 0.3 0.0 0.3 • • 5.0 3.7 4.1 7.4 7.3 8.3 7.2 2 of 2 Site Name: Roxboro Remnant of East Ash Basin (REAB) Date: 9/8/16 Threshold Criteria: All closure options must comply with the following threshold criteria based on Duke Energy Guiding Principals for Ash Basin Closure 1. Provide continued geotechnical stability meeting appropriate safety factors under applicable loading conditions 2. Provide flow capacity and erosion resistance during design storm and flooding conditions 3. Effectively mitigate groundwater impacts (in conjunction with GW remediation where present) 4. Comply with applicable state and federal regulations (e.g. North Carolina Coal Ash Management Act) APPENDIX B (WITH ONLY CLOSURE COST) Scoring for Evaluation of Closure Options Closure Options Evaluation Worksheet Ash Basin Closure - Master Programmatic Document Duke Energy Option -Specific User Input 1 = Calculated Value Placeholder values have been entered in "User Input" cells to prevent division by zero error text in calculated score cells. Option Description 1A In Place Closure (Lower Discharge Channel/No Ponding) 1B In Place Closure (Maintain Existing Discharge Channel/fill to Grade/No Ponding) 2A Closure by Removal (Lower Discharge Channel/No Ponding) 2B Closure by Removal (Maintain Existing Discharge Channel/Ponding) 3A Hybrid Closure with New Stabilization Berm (Lower Discharge Channel/Ponding) 3B Hybrid Closure with New Stabilization Berm (Maintain Existing Discharge Channel/Ponding) 4 Closure by Removal with Dredging (Maintain Existing Discharge Channel/Same Approach as Option 2B/Ponding) Note: Options that did not meet threshold criteria should be listed in the Options Summary table above for completeness Environmental Protection and Impacts Weight: 30% Refer to This Area Not Used For Interpretation of Environmental Modeling Results Modeled surface water impact EM Sub -Scoring Sheet 21% 6.3% Refer to This Area Not Used For Interpretation of Environmental Modeling Results Modeled off -site impact EM Sub -Scoring Sheet 43% 12.9% Referto This Area Not Used For Interpretation of Environmental Modeling Results Groundwater impact beyond the waste boundary EM Sub -Scoring Sheet 21% 6.3% Interpolation. Zero miles Air emissions off -site (based on miles driven) scores 10. Truck miles driven Miles 0 669815 6 0 5 9 Interpolation. Zero gallons Air emissions on -site (based on miles driven) scores 10. Truck miles driven Miles 0 11424 10 10 Interpolation. Zero acres Disturbed acres of Avoidance of greenfield disturbance scores 10. greenfield Acres 0 23.52657025 6 0 5 9 8 8 10 5% 1.5% Weight: 35% 2.9 2.7 2.7 2.8 2.9 2.9 3.0 Cost Closure Cost Closure Cost Interpolation. Min value scores 10. Max value ($million) OM&M Cost USD $ 4.80 $ 8.90 1.0 1.2 0.0 10.0 3.2 8.3 3.9 80% 28.0% Operation, Maintenance and Monitoringscores Cost 0. ($million) USD � � $ 1.90 $ 2.20 0.0 0.0 0.0 10.0 6.7 6.7 0.3 0.3 0.0 3.5 1.4 2.8 1.8 Schedule Weight: 15% Interpolation Minimum Time to move first Initiation Time value scores 10 ash Months 0 2 10 10 0 0 0 0 0 30% 4.5% Interpolation Minimum Construction Duration value scores 10 Estimated durations Months 4.4 9.9 6 0 5 9 8 8 10 70% 10.5% 1.1 0.5 0.5 0.9 0.8 0.8 1.1 1 of 2 Site Name: Roxboro Remnant of East Ash Basin (REAB) Date: 9/8/16 APPENDIX B (WITH ONLY CLOSURE COST) Scoring for Evaluation of Closure Options Closure Options Evaluation Worksheet Ash Basin Closure - Master Programmatic Document Duke Energy Option -Specific User Input 1 = Calculated Value Placeholder values have been entered in "User Input' cells to prevent division by zero error text in calculated score cells. Regional Factors Weight: 15% - Plan or potential for beneficial reuse of site - Subjective - - • Mot Used For Subjective Scoring is • • • • • - 5% - 0.8% Interpolation Min value 1 scores 10 Max value Imported soil needs scores 0 Soil Imported Cy • • • • 0 189781 6 0 5 9 8 8 10 5% 0.8% Interpolation. Maximum Beneficial reuse of CCR value scores 10. Fraction Used Cy • • • • . • . • • 97101 0 0 0 10 10 4 4 10 15% 2.3% Interpolation Min value scores 10 Max value Transportation impact (based on miles driven) scores 0 Miles Driven Miles 11424 669815 6 0 5 9 8 8 10 65% 9.8% Noise impact due to on -site activity (based on proximity of neighbors to on -site work areas) Subjective 0 to 10 Not Used For Subjective Scoring • • • 5% 0.8% View impact (based on final height of storage facility and land uses within viewshed) Subjective 0 to 10 • • • • • • 5% 0.7% 0.7 0.1 0.9 1.3 1.0 1.1 1.4 Constructability Weight: 5% Subjective 0 to 10: 10 is Consider stormwater management, geotechnical, the easiest while 0 is the Not Used For Subjective Scoring and dewatering riskiest • • 100% 5.0% 0.2 0.3 0.0 0.3 0.0 0.2 0.5 • • • • 5.1 3.9 4.1 8.9 6.1 7.8 7.8 2 of 2