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HomeMy WebLinkAbout20150998 Ver 1_401-404 Scoping Meeting Request_20150914RMA �+'�► North Carolina Department of Environment and Natural Resources NCDENR. SCOPING MEETING REQUEST Please complete all the information below. Call and Email the appropriate coordinator with the completed form. • Asheville Region - Alison Davidson 828 - 2964698; alison.davidson(a.ncdenr..gov • Fayetteville /Raleigh Region - David Lee 919 - 791 -4203; david.lee(a.ncdenr..aov • MooresvilleMinston Salem - Patrick Grogan 704 - 235 -2107, patrick.grogan(cbncdenr..c�ov • Washington Region - Lyn Hardison 252 - 948 -3842; lvn.hardison(c ncdenr.gov • Wilmington Region -Cameron Weaver 910 - 796 -7303; cameron.weaverna.ncdenr.gov Project Name: L.V. Sutton Energv Complex County: New Hanover Applicant: Steve Cahoon Company: Duke Enerqv Address: 410 S. Wilmington Street City: Raleigh State: NC Zip: 27601 Phone: 919 - 546 -7457 Fax: Email: steve.cahoon(a)duke- energv.com Physical Location of Project: L.V. Sutton Enerqv Complex Sutton Steam Plant Road, Wilmington, NC 28401 Engineer /Consultant: Thomas Bristol Company: Geosvntec Consultants of NC PC Address: 1300 South Mint Street, Suite 410 City: Charlotte State: NC Zip: 28203 Phone: 803 - 724 -3266 Fax: Email: tbristol(a)geosvntec.com Please provide a DETAILED proiect narrative, pdf site plan and a vicinity map with road names along with this Request form. The project narrative should include the following when available: Existing Conditions- List of existing permits, previous project name(s) or owner name(s), existing compliance or pollution incidents, current conditions or development on site, size of tract, streams or wetlands on site *, stream name and classification, historical significance of property, seasonal high water table elevation, riparian buffers, areas of environmental concern, setbacks *Relative To Wetlands — Federal and coastal wetlands must be delineated by a US Army Carps Regulatory Official, Coastal Management Field Rep or a qualified environmental consultant prior to undertaking work such as filling, excavating or land clearing. The delineations must be approved by the US Arm Carps of Engineers (USA CE) and /or the Division of Coastal Manapernent. Wetland delineations are valid for a period not to exceed five years frorn date of USACE approval. Proposed- Full scope of project with development phase plan, acreage to be disturbed, wetlands to be disturbed, waste treatment & water supply proposed, soils report availability, % impervious surface, stormwater treatment and number of bmps, public or private funding. I IVease Ilpiro de gxtiiu xted iiinvextirneint & exllpe to eii-q lbyrneint unuii-Wlbeirx�, New 6)s For the scoping meeting, it is best to provide a list of questions and topics of concern. It is helpful to know what you hope to gain from the meeting. Please have thoughts and presentations organized as much as possible to make the best use of time. Agencies Involved: Check all agencies that may be involved with project: ❑ Marine Fisheries ❑ National Marine Fisheries ❑ U.S. Fish & Wildlife ❑ Wildlife Resources ® Coastal Management ❑ DEMLR 0 Stormwater) ® U.S. Army Corps of Engineers ❑ Shellfish Sanitation ®Water Resources: (® 401 /buffer, ❑ NPDES, ❑ Aquifer Protection) ❑ Public Water Supply ❑ Air Quality ® Solid Waste NCDENR Scoping Meeting October 2013 ❑ UST ❑ Other ❑ Other ❑ Other eInUU VVQ DUKE q, F,'IYP QGN SS Project Narrative — Coal Ash Management Act (CAMA) mandated CCR Basin Closure and On -site Landfill Project LV Sutton Steam Station Wilmington, NC Project Purpose and Need Duke Energy Progress, LLC (Duke Energy) is required by the 2014 Coal Ash Management Act (CAMA) Section 3(b), to close LV Sutton Coal Combustion Residual (CCR) surface impoundments in accordance with CAMA Section 3(c) by 1 August 2019. Duke Energy submitted a Coal Ash Excavation Plan to the North Carolina Department of Environment and Natural Resources (NCDENR) on 13 November 2014 describing CCR removal plans beginning with removing ash to an off -site location while simultaneously developing an on- site landfill to meet the CAMA mandated closure date. The purpose and need of the project as proposed is the permitting, construction and operation of an on -site landfill at the L.V. Sutton Steam Station (Sutton) for the disposal of approximately 7.14 million tons of CCR material resulting from the excavation and closure of the 1971 and 1984 Basins and LOLA. Proposed Location and Site Plan Sutton is located in New Hanover County, approximately 4.5 miles north of the city of Wilmington in North Carolina (Figure 1) and is situated between the Cape Fear River to the west and the Northeast Cape Fear River to the east. The Sutton Plant operated as a three - unit, 575 - megawatt coal -fired plant from 1954 until retirement in 2013. Upon retirement of the coal -fired station, a new 625- megawatt gas- fired, combined -cycle facility began operating. The coal -fired units at Sutton are currently undergoing decommissioning and demolition. There are two CCR basins located at Sutton: (i) the 1971 Basin and (ii) the 1984 Basin (Basins). The approximate areas of the 1971 Basin and the 1984 Basin are approximately 54 and 82 acres (ac), respectively. The Basin locations are shown on Figure 2. The 1971 Basin was operated from 1971 to 1985 and temporarily in 2011. The 1984 Basin was operated from 1984 to 2013. Both basins contain fly ash, bottom ash, boiler slag, storm water, ash sluice water, coal pile runoff, and low volume wastewater. Scrubbers were not installed at the Sutton Plant; therefore, Flue Gas Desulphurization (FGD) residuals are not expected to be found in the CCR basins. Other notable features at the site include: (i) the Lay of Land Area (LOLA), located south of the 1971 Basin (ii) the Cooling Pond (also referred to as Lake Sutton), declared waters of the State on 7 November 2014; and (iii) a discharge canal that conveys water from the plant to the Cooling Pond. Investigations conducted within LOLA indicate that the area contains a mixture of CCR and soil; therefore, Duke plans to excavate the material from LOLA and dispose of it in the proposed onsite CCR landfill along with CCR excavated from the Basins. The proposed landfill will be located east of the Basins and LOLA, on the existing site as depicted in Figure 2, and described in further detail in the following section. b1V� P DUKE roject Narrative: LV Sutton Steam Stations o1uuu �u,o� Coal Ash Management Act (CAMA) mandated CCR Basin Closure ENERGY, and On -site Landfill Project PIRO(;;JR "?r`" Project Activities Description After obtaining necessary permits and approvals, anticipated landfill construction activities and basin closure includes: • Modifying existing rail spur and constructing rail car loading facility for initial off -site CCR transport; • Installing erosion and sediment control measures and stormwater management infrastructure; • Constructing the landfill liner system including: • Earthwork: excavation and fill to construct liner system subgrade, perimeter berm /roadways, and storm water management infrastructure (e.g., channels and surface water basins); • Double liner system construction including (from top to bottom) a 24 -in thick protective cover layer, primary geocomposite drainage layer, primary geomembrane, secondary geocomposite drainage layer, secondary geomembrane, geosynthetic clay liner, and a 12 -in thick compacted soil layer; • Leachate collection and removal system construction including connection to on -site storage facility to allow leachate management; • Providing power connections to operate leachate collection systems; • Building haul roads (soil) to support liner system construction and perimeter roads (aggregate) to support landfill operations; • Implementing the approved Landfill Groundwater Monitoring Plan; • Removal of CCR from the basins and filling the landfill with ash placed in compacted, controlled, and monitored lifts; • Earthwork excavation and fill to grade stockpile and CCR storage areas to proposed final grades followed by stabilization by establishing permanent vegetation; • Closing the landfill by constructing a final cover system including (from top to bottom) a 6 -in thick vegetative cover, 18 -in thick protective layer, geocomposite drainage layer, and geomembrane; • Closing the basin areas including removal of some areas of the dikes, fill, grading, and stabilization; and, • Providing post - closure operations, maintenance, and care. A phased erosion and sediment control plan has already been prepared and submitted as part of the landfill application package. The erosion and sediment control plan was prepared to meet applicable local and state regulations and includes: (i) temporary erosion control measures (sediment basins, stone filters terraces, sediment fences, etc.); (ii) permanent erosion control measures (rip rap, energy dissipaters, ditch stabilization, pipe drain, etc.); and (iii) seeding specifications and schedules. Closure of the CCR surface impoundments will require design and installation of erosion and sediment control devices to properly address potential sources of erosion and sedimentation associated with excavation and grading activities. Protective measures may include temporary diversion channels, sediment fencing, sediment basins, riprap slope or ditch protection, and other applicable measures. The erosion and sediment control plan will be 4 b1V� P DUKE roject Narrative: LV Sutton Steam Stations o1uuu �u,o� Coal Ash Management Act (CAMA) mandated CCR Basin Closure ENERGY, and On -site Landfill Project PIRO(;;JR "?r`" prepared with consideration to staging of activities, with erosion and sediment control devices designed specifically for the activities underway at any given time. Project Compatibility with Laws and Regulations A Site Suitability Report has been prepared and submitted to NCDENR as part of the proposed onsite CCR landfill application. Site suitability was approved on 2 July 2015. The proposed landfill project is compatible with local, state, and federal laws and regulations. The proposed landfill will be permitted through the NCDENR Solid Waste Section in accordance with the applicable landfill requirements under Title 15A, Chapter 13, Subchapter B, Sections .0500 and .1600. Furthermore the proposed landfill will be compatible with location restrictions and design criteria defined by the 2014 CAMA and Federal CCR Rules published April 17, 2015. Permitting The Solid Waste Section is the lead permitting agency and permits include: Letter of Site Suitability (received on 2 July 2015) Permit to Construct (application currently under review by NCDENR) Permit to Operate Other permits will be required for basin closure and landfill construction and operations including: • Local zoning consistency • Modification of station industrial stormwater NPDES permits • Sanitary sewer connection permits • Erosion and sediment control permits • Wetlands 401 & 404 permits • Dam decommissioning Identification of Environmental Features Wetlands: • Six isolated wetland areas were identified and delineated within the proposed landfill footprint. There is no apparent nexus of these wetlands to the cooling pond or other waters of the US. The total area of the wetlands is 6.57 acres (see Figure 3A). Impact to these wetlands would be required to facilitate landfill construction in support of the CAMA mandated closure at Sutton. • Wetlands areas have been identified adjacent to the basin dikes and cooling pond. The wetland area is approximately 3.8 acres (see Figure 3A). These wetlands would be impacted to facilitate excavation of CCR material and basin closure for compliance with CAMA. 3 b1V� P DUKE roject Narrative: LV Sutton Steam Stations o1uuu �u,o� Coal Ash Management Act (CAMA) mandated CCR Basin Closure ENERGY, and On -site Landfill Project PIRO(;;JR, "?r`" There are wet areas within the basins and LOLA. These areas were not delineated as wetlands as the soils are primarily CCR waste and do not meet hydric soil indicator requirements. Geosyntec anticipates that these areas would be exempt from 404/401 permitting as they occur within waste disposal / treatment areas. Further avoidance and minimization for impacts to the areas listed above are not feasible if compliance with CAMA mandate for CCR basin closure is to be achieved. • A site -wide wetland delineation has been performed and a jurisdictional determination request submitted to the Army Corp of Engineers. Streams and Rivers: • No streams were identified on the project site. There will be no impacts to streams. • The Cape Fear River is located adjacent to the project site to the west. There will be no impacts to the Cape Fear River. Lakes and Ponds: • The Sutton Plant cooling water pond and discharge canal are located adjacent to the CCR basins. Removal and closure the CCR basins will include decommissioning and removal of portions of the basin dikes and will result in the expansion of the cooling water pond after the CCR has been removed (see Figure 313). Floodplain: • The proposed landfill footprint is not located in the 100 -year floodplain, as shown in Figure 4. Threatened and Endangered Species: A Threatened and endangered species habitat survey has been completed and agency consultations have been conducted. The USFWS responded that and there are no anticipated impacts to threatened or endangered species or their habitat. DENR Office of Land Stewardship responded with a list of species records from the NCNHP database. Cultural Resources: • The project will not impact historical or cultural resources based on consultation received from SHPO. State Parks and Recreation Areas: • Game Management Area is located to the west of the proposed site. The site proposed for the on -site landfill is not located within the Game Management Area. The current CCR units are located directly adjacent to the cooling pond and Management Area. Relocating the CCR further from the pond would be beneficial to this area. IH b1V� P DUKE roject Narrative: LV Sutton Steam Stations o1uuu �u,o� Coal Ash Management Act (CAMA) mandated CCR Basin Closure ENERGY, and On -site Landfill Project PIRO(;;JR "?r`" • The project will not impact State Parks or Recreational areas. Consultation has been received from DENR Division of Parks and Recreation. Land Use: • Final land use will be consistent with current adjacent land uses. Mitigation • A mitigation plan will be developed as needed through the CWA Section 404 and 401 permitting process and will include coordination with USACE and NCDENR for permitting and mitigation of unavoidable wetlands impacts for which mitigation would be required. Final closure plans under development for the Basins and LOLA would include decommissioning and removal of some of the basin dikes and will result in the expansion of the cooling water pond after the CCR has been removed. The closure will replace the basins with natural areas and would provide expansion of open water from the Cooling Pond (Lake Sutton), transitional wetland areas, and upland habitat (see Figure 3B). This plan will result in a net gain to waters and wetlands and ecological benefit. List of Figures: Figure 1 Site Location Map Figure 2 Site Vicinity Map Figure 3a Draft Site Development Plan Figure 3b Conceptual Basin Closure Plan Figure 4 FEMA Floodplain Map 5 Legend ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Existing Basins Property Boundary Cooling Pond Proposed Landfill Footprint 0.75 0.375 0 0.75 1.5 Miles SITE TOPOGRAPHIC MAP L.V. SUTTON CCR LANDFILL L.V. Sutton Energy Complex Wilmington, North Carolina DUKE Geosyntec Notes V" E Y Figure 1. Basemap Source: Copyright:© 2013 National Geographic Society, consultants F R ° "` R i -cubed Charoltte, NC August 2015 Legend ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Existing Basins Property Boundary Cooling Pond Proposed Landfill Footprint Notes 1. Basemap Source: Source: Esri, DigitalGlobe, GeoEye, i- cubed, USDA, USGS 0.4 0.2 0 0.4 0.8 Mile SITE VICINITY MAP L.V. SUTTON CCR LANDFILL L.V. Sutton Energy Complex Wilmington, North Carolina Geosyntec °� DUKE �;u ��" ' ENE Y Figure consultants PR x< t I 'SS 2 Charoltte, NC August 2015 TIDW 7 (Y PRW- 4 ,.....•, oNHC -SW3 z 500' WELL BUFFER ry, rr IDW 11 a � �" "' "'" ' PRW 6 00' WELL BUFFER *` q / O q 500 WELL BUFFER / ` ' �m 1 M ONHC / \ / LIMIT OF DISTURBANCE / ODW 6 ; . SITE ENTRANCE AERIAL MAPPING LIMIT PROPOSED LANDFILL .F.- O:,I . O.,T,+ PR I Na T (NOTE 6) (101.11 ACRES) � DW2 _jDW3, DW -4 _ ON.� H C -_ SW _ 2 57 MW - 12 PROPERTY BOUNDARY NMW r ETLANDS IN LANDFI LL r ...,. r r y, _.e ,�.... .. _ ....M- ... -�. -- .. . - _ - .. :.. _ . ._..P..RI.N.T PZ 6D PZ -14 > r r r ..... -i ..... __ _.._ - _- .. . .l. .w . te . _ ...y l d M W 33C T_ - 50' PROPERTY BUFFER Ty 1 ■LA -PZ -2 LA SPT -5 %�:\ MPZ 29 EPZ 18 ■PZ -23 'F , i l ■PZ -25 ■ I r LA SPT 6 LA PZ-4 I .._ ... , C, �PZ 5X LA PZ 3 �. ,, i I '��j I: ILIA Z5 MW _32C r NORTH SURFACE \y, � M PZ 9 ;' � ' „ , WATER POND PZ iX ■PZ -13 MW 248 ■PZ 17 +SPr 11 (11.85 ACRES). \..� I O O O PZ 19 l _O , LA -SPT 3 s d O III„ y / , �('� ,�PZ -27O �7MW 238 10 ■PZ -7 PZ 11 bz 1s s Pz zx ■ ■ y + / IOMW -35C MW-24C +LIASPTa /1. LAPZ1:..� LASPT2 i ,.f r, // LEACHATE,.. ,,.- _._..._iA -SPT3' - t .r I -- '. /_ /�' �' � dMW 23C I W3B .NMW28B f .�..< .. -�^!'r tl -„ .;..:.. .._.yr _... .... .. _..,... '.' ""....m" _.._�. .y i.. �..i.' ..r-' , MW -22C 1 ,' STORAGE AREA - v ' PZ -0X .a.w, ». PZ 10D .._ ., .. ..., _ W -6A a a: _s.r sPT -1o_ - v yMw -3e dmw7c a, -.d 1. .__... ... :, ..--. ,,,, -.,-� _.: -mw -3A NMW_22E NM 1 : -,', ; -.i: 'NMW 10 PZ 105 ...... .a _e A. *.,.q„PZ 20 ' �'" "J PERIMETER '' „j'PERIMETER ; r MW 34C `'"'" - a= ... .J:M. �,- AMW 28C ,) ,rl ..._ *PZ z4 '^+,.rte..,.. ,*. '""..- "...rr »- _. p . l „'iMW -6C_,. :� .m.,.A, .,.... ..._... / it *MW-7B IIPZ 28 MW 2A 23p4 _T ._ f r, ,.NMW 21C SOUTH SURFACE ,000- _- .__.___:_ ... -.. -_ _ -_ -_ -_ " -_ _ i �. /,. 'r ;7 MW 2C WATER POND I ,„,m, - ■PZ 28 7GWPZ 28, �PZ 1B� -` '. r 1984 ASH BASIN'S 4B r` -Y" NMW 1A > Y` (10.54 ACRES) / - �', LINE °w,v r .. / ,. ,�,,,,, „�„�,, „,H„�,�PZ 1A,,.,�_, ■GWPZ 38, ` ,) *. LINE BUFFER r, -¢SPT 5. BOUNDARY ■GWPZ SCPT 2 � �... ! _ r,^ _"-•.� .yI PZ 103 -PZ 103.. ,"�, i „ ` NCPT -6A f -41CPT3 ,` #MW 1B' IAGWPZ 1B ,..�, NMW 18 qy r �i #PZ3B ti �,, , ,, f /' r �!'�' '*++„*.^"^ ,'�. <kMW 17 `y k dMW -27C I IA . p , , ; , r /. ;a,�/ .1971 ASH BASIN' W - BOAT LAUNCH ACCESS ROADS '. / SPT 4u ; Hb` IA`"w BOUNDARY (TO BE RELOCATED) i SSCPT 4 *µr IIPZ -102 r), �,i ,. 1NSPT7 /n /({ SSCPTI ,;,�„ w- ^' "ow.,a«...:i„r AY OFLANDAEDR -5 CPT-4 +SPT -14 .M"°7'?1 MW 16D MPZ19713 iEOP-0 ARY P�-4A �, ,GP -17 ' , (LOLA)BO \p � µSG CPT 7A CPT 1' r, *. /i v r r '� 0GP 15.. GP -16 G�GP -6 / yl I, ■PZ 4B r,/ RSDPT 6 GP 16A , $GP 7 / Approximate Estimated Airspace f - pp p R ■PZ 101 Construction Sequence Waste Footprint Available for Waste Estimated ",.„ xw 0GP 2 Lifetime ears Z5 "` sc 1� r� (acres) Disposal Icy) (Y ) �i _ $'SPT -6w",. v 2 � IMGP3 ���;. Y� G "N, ,� �'• r i \ ■PZ 5B �„ SCPT 5A:,:, .l / G1GP1,� ,, „ f 'Fe'e . ; +FMB 2 ,,... ,� �mNM L� �% �r � '^.m+r"�PZ 6A, `> PZ -INT': s.... - , . �, GP -13 , , '',_ Mw-15 Cell 3 10.1 840,787 0.9 sGL �w�(�0 / /! %liu�N , Pz 105 Pe // k W6B , *SPT -9 /PZ INT �._l / f}� . 4GP -12 i HA 004 PZ-105 90� Y „r °...,, �y Nv µ Cell 9.2 810,807 0.8 / / ; 777 NMW 15D Cell 8.9 766,286 0.7 ". �� \� � �• ` hSPT1s �� GIGP 11oP 10 r' / D Phase FMB 1B 3p... Cell 9.0 806,715 0.7 1lePr5 ., HA31� 7�ti1 PZ tO8S HA-004-B-3 ,E HA 3 2 / PZ 104 SCPT 3.A \ l PZ 108D/ HA 004 -PZ -106/ MW -13D~r / / /I Cell 7 9.0 818,223 0.8gD q .. r SPT -1° / r MW 13 " 457,857 saT 1z• ,, ,�� i%` �// p / Cell $ 9 9 902,372 2 COOLING POND o6DL NG POND c3 s A RES Ff a oP s �PZ 106, r 9OP8 j 04 Phasel A Dos Pz aGP s ( I , Cell2 7.9 549,967 1.3 > dmw -20 i C ..... 4YED �. - Cell 9 10.0 916,989 1.5 A1sG z HA 2 =z' "r' �" OD Phase 3 Cell 10 9.5 1,038,598 1.5 Y'���,Rti*"J OEDR 11 S w �PZ 107 PZ 107r 2. TF Cell 11 10.5 840,385 1.6 �� "/ ( _ ✓ •.are "'� r Totals 101.1 8,748,987 11.9 w LEGEND NOTES: pE -- PROPERTY BOUNDARY FEMA FLOOD ZONE AE (NOTE 7) 1. COORDINATES ARE BASED ON NORTH CAROLINA STATE PLANE GRID SYSTEM, NAD83. w ELEVATIONS ARE BASED ON NAVD88. fs -- --' -- EXISTING GROUND ELEVATION 3 FEMA FLOOD ZONE X (NOTE 7) o CONTOURS IN OBSCURED AREAS (NOTE 1, 2, AND 4) ^ „m� „m........ ^ .............. ^... ".......- WETLANDS - NATIONAL WETLAND INVENTORY 2 IMAGERY COELEICT D ON 17 APRIL 2I014.ADATA PROVIDED WHERE CLEAR AND MAPPING SABLE ON REV DATE DESCRIPTION URN APP - - - -- ) (�.. eosynte NOTE 8 THE IMAGERY IS WITHIN 2' OF ITS TRUE POSITION. gyp. CONTOURS IN OPEN AREAS NOTE 1 AND 2 .;�� � { NI �g Pr ^.S WETLANDS- SURVEYED(NOTE 9) 3. IS BASE ON UTILITIES AND IS AFRO WHETHER PUBLIC OR PRIVATE, (b� mT��l)TNI ID - -- AERIAL MAPPING LIMIT (NOTE 6) R BASED ON PHOTOG VERIFY LOCH MAPPING AND C APPROXIMATE. IT IS THE USERS N /yy�H„,,,,,„ „�i LL ip. i HAND AUGER RESPONSIBILITY TO VERIFY LOCATION PRIOR TO COMMENCEMENT OF ANY DESIGN ORxSlllBroaC:B:mu' OF NC, PC '�IWfIIMI' IEp, - - DRAINAGE CENTERLINE (NOTE 2) CONSTRUCTION. a A CO NE PENETRATION TEST 13MSOUTHMINTSTRE ,5UITE410 t1 4I D\�R I,., ��, 4. DASHED CONTOURS AND ESTIMATED SPOT ELEVATIONS SHOWN IN OBSCURED AREAS ARE 0 300' 600' CHARLOTTE, NO 28203 USA S FENCE LINE (NOTE 2) {p SEISMIC CONE PENETRATION TEST COMPILED FROM LIMITED MATT ON SHOW IN DATA DUE R CONDITIONS DURING THE 17 �, ®� PHONE: t0a.22].ob4-0 GRAVEL / DIRT PATH (NOTE 2) APRIL 2014 FLIGHT. INFORMATION SHOWN IN OBSCURED AREAS ARE FOR REFERENCE SCALE IN FEET TITLE: A GE0.PROBE ONLY. DRAFT SITE DEVELOPMENT PLAN 4 ,. SPOT ELEVATION (NOTE 1, 2, AND 4) d� BORING 5, CONTOURS SHOWN UNDERWATER ARE FROM BATHYMETRIC SURVEYS CONDUCTED BY SPOT ELEVATION ESTIMATED WSP IN JUNE 2014. PROJECT- CONSTRUCTION PERMIT APPLICATION DRAWINGS IN OBSCURED AREAS (NOTE I, 2, AND 4) ■ PIEZOMETER 6. CONTOURS SHOWN OUTSIDE THE AERIAL MAPPING LIMIT ARE FROM A LIDAR SURVEY z TREE /BRUSH LINE (NOTE 2) MONITORING WELL DATED APRIL 2007 OBTAINED FROM THE NORTH CAROLINA DOT GIS WEBSITE. CONTOURS ONSITE CCR DISPOSAL FACILITY AND TOPOGRAPHY WITHIN THE AERIAL MAPPING LIMIT WERE OBTAINED FROM AN AERIAL SHE w SURVEY DATED MARCH 2015 (FLOWN 17 APRIL 2014) AND WERE OBTAINED FROM WSP. L.V. SUTTON ENERGY COMPLEX (NOTE NE 2AND UTILITIES /STRUCTURES /OBJECTS O WATER SUPPLY WELL s F ZAN03) ® WILMINGTON, NORTH CAROLINA 28401 p ABANDONED WATER SUPPLY WELL 7. FLOOD ZONE INFORMATION OBTAINED FROM NEW PANELS 310 COUNTY GIS WEBSITE AND UTILITY POLE (NOTE 2 AND 3) ARE SHOWN IN REFERENCE TO FEMA FIRM MAP PANELS 3109 AND 3200, LAST REVISED 2 DESIGN EY: VMD DATE: JULY 2015 ♦ STAFF GAUGE JUNE 2006. TRANSMISSION LINE 8. NATIONAL WETLAND INVENTORY INFORMATION SHOWN WAS OBTAINED FROM THE US FISH DRAWN av: JWO PROJECT No GC5770.02 w DISPOSAL AREA WATER (NOTE 5) AND WILDLIFE SERVICE WEBSITE. �o IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII SURFACE WATER PONDS 9. WETLANDS WERE OBTAINED FROM FIELD DELINEATION BY GEOSYNTEC AND PROVIDED IN A CHECKED av: VMD FILE: GC5770.02P050 o V ASH BASIN/COOLING POND BOUNDARY IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII DRAWING DATED 4 MARCH 2015 BASED ON FIELD SURVEY BY WSP. DRAFT WORK I N PROGRESS (APPROXIMATE) LEACHATE STORAGE AREA llllllllllllllllllllllllllllllllllllllllllllll REVIEWED ev: MAO oaawlNC No.: JUJUJUJUJUJIM p 6.57 AC OF ISOLATED WETLAND AREA FOR REVIEW ONLY, NOT FOR CONSTRUCTION APPROVED BY VMD 3A I N 202165 w A N 201165 B N 200165 C N 199165 . —._ — .— ._.. —.- D N 198165 E N 197165 'II COOLING POND z I 3 4 5 6 8 \ ` o N o 0 \ 0 0 \ ' \ w- w / w w w i �'-AP 3ROXIM SITE PR BO 3PERTY BOUNDARY / 1 i m � \ \ \ i o ^ow o N , µ u ----- ... '4 ro .._.. \ 10 � 6 4 �,..,.,...... '....ems / —. LAY OF LAND' AREA�LOLA� I, 311:11, Z ul I F i �l F N 196166 bl 0� 11 1• )� �_ Q I � qp�• r r y,� ' - I DRAFT WORK IN PROGRESS — FOR REVIEW ONLY, NOT FOR CONSTRUCTION 1 2 3 4 5 1 6 1 7 8 LEGEND is MAJOR CONTOUR ELEVATION TARGET EXCAVATION CONTOUR ELEVATION - - - - -- — APPROXIMATE COOLING POND /CANAL OUTLINE ----------- - - - - -- APPROXIMATE EDGE OF BASIN APPROXIMATE LAND LIMIT OF LOLA AND ASH BASIN APPROXIMATE PROPERTY BOUNDARY _ DIRT /UNPAVED ACCESS ROAD -- -- -- EXISTING MAJOR CONTOUR ELEVATION PAVED ACCESS ROAD COOLING POND AND BASIN WATER ELEVATION 3H:1V SLOPE LABEL A B C D CONCEPTUAL CLOSURE NOTES - WET OPTION IV 1. THE 1984 BASIN WILL BE GRADED AS THE DRY OPTION. 2. REMOVE AND PARTIALLY RECONSTRUCT THE BERMS ADJACENT TO THE DISCHARGE CANAL IN THE 1971 BASIN AND THE WEST SIDE OF LOLA, ALLOWING THE COOLING WATER POND TO EXTEND OVER THESE AREAS. 3. THE PRELIMINARY GRADING SHOWN IS CONCEPTUAL AND WILL BE OPTIMIZED IN SUBSEQUENT ENGINEERING STAGES. 4. NO STORMWATER CONVEYANCE CALCULATIONS HAVE BEEN PERFORMED IN THIS CONCEPTUAL STAGE. 0 300' 600' SCALE IN FEET E REV I DATE I DESCRIPTION I DRN I APP GeoSynteC onmmiuN" DUKE cons ultanO,s OF NC, PC 1300 SOUTH MINT E STREET SUITE410 �� �.d�la,"J R J S CHARLOTTE NO —VI USA PHONE ]0422]0940 TITLE CONCEPTUAL BASIN CLOSURE PLAN PROJECT: L.V. SUTTON STEAM STATION CLOSURE GRADING OPTIONS SITE WILMINGTON, NORTH CAROLINA 28401 F DESIGN BY. CFB DATE MARCH 2015 (DRAWN BY'. CET PROJECT NO: GC577O CHECKED BY: CFB FILE 5770 010 WET OPTION VIII REVIEWED BY RK DRAWING NO.: APPROVED BY: RK 3B 7 8 Legend Proposed Landfill Footprint Notes 1. Basernap Source: FEMA FIRM Panels rs 011 FIRM FLOODPLAIN MAP L.V. SUTTON CCR LANDFILL L.V. Sutton Energy Complex Wilmington, North Carolina DUKE GeosyntecL'l V ENERGY consultants F1j111(X31'111FSS Charlotte, NC August 2015 Figure 4 N