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HomeMy WebLinkAboutWI0400551_Application_20200619DUKE 526 South Church St Mail Code EC13K ENERGY. Charlotte, NC 28202 CAROLINAS June 19, 2020 Mr. Michael Rogers N.C. Department of Environmental Quality Division of Water Resources, UIC Program 1636 Mail Service Center Raleigh, North Carolina 27699-1636 Subject: Underground Injection Permit Application Duke Energy Carolinas, LLC Belews Creek Steam Station 3195 Pine Hall Road, Belews Creek, NC 27009 Mr. Michael Rogers, On behalf of Duke Energy Carolinas, LLC (Duke Energy), AECOM Technical Services of North Carolina Inc. (AECOM) is submitting the attached Application for a Permit to Construct or Operate Injection Wells — Injection Well Type "Other" (UIC Permit) to install and operate a clean water infiltration system as part of a proposed groundwater remediation system for the Duke Energy Belews Creek Steam Station (BCSS). The groundwater remediation system intends to accelerate the corrective action process to meet applicable groundwater standards. The UIC permit application and associated attachments are provided for approval to install and use 74 clean water infiltration wells as part of groundwater remediation activities at the Belews Creek Steam Station. Background A Consent Order (CO) that specifies obligations related to the closure of the coal ash impoundment and groundwater corrective action at the Belews Creek Steam Station (Belews Creek) was signed on February 5, 2020 to address a Settlement Agreement between Duke Energy, the North Carolina Department of Environmental Quality (NCDEQ) and relevant community groups. The CO requires constituents of interest (COls) attributable to the Belews Creek ash basin be remediated to concentrations less than the North Carolina Administrative Code, Title 15A, Subchapter 02L, Groundwater Classification and Standards (02L) by December 31, 2029 at or beyond the defined Geographic Limitation. COls identified in the Corrective Action Plan (CAP) Update (Synterra, 2019) include arsenic, beryllium, boron, chloride, cobalt, iron, lithium, manganese, strontium, thallium, and total dissolved solids. The "Geographic Limitation" is defined in the CO as 500 feet from the ash basin waste boundary, at the property boundary, or the boundary of a water body, whichever is closer. Groundwater flow and transport modeling was used to evaluate and select a groundwater remedial alternative in the CAP Update developed by Synterra Corporation and submitted to NCDEQ on December 31, 2019. Following the acquisition of a 2.67-acre parcel within the Geographic Limitation by Duke in March 2020, the groundwater flow and transport model and selected remedial action were updated to their current iterations as detailed in the Consent Order Provision submitted to NCDEQ on April 7, 2019. The current schedule detailed in the CO BUILDING A SMARTER ENERGY FUTURE"' June 19, 2020 Page 2 assumes that groundwater remedial activities at the Belews Creek Steam Station will begin in 2020. As discussed in the CAP Update (SynTerra 2019), groundwater in the area of the Site occurs in three interconnected hydrostratigraphic zones: • The shallow flow zone in soils and saprolite (saprolite zone), • The transition flow zone (referred to as "deep" in some previous reports); and • The bedrock flow zone. Groundwater flow and transport modeling suggest site -related COI extend from the saprolite into the bedrock flow zone. Groundwater Remediation Activities The groundwater remedial action selected in the CAP Update includes a groundwater remediation system that consists of a combination of groundwater extraction and clean water infiltration. The proposed groundwater remediation system will be installed in phases, beginning with a pilot -scale system (Phase 1) to facilitate refinement of the final system design and implementation. Following Phase 1 implementation and evaluation, the full-scale system will be designed and installed (Phase 2). The groundwater treatment system is designed to maximize pore volume exchange (i.e. groundwater flushing) and establish groundwater flow control and capture in areas downgradient of the Belews Creek Steam Station ash basin. Phase 1 of the groundwater extraction system will include 23 groundwater extraction wells that will utilize down - well submersible pumps to convey groundwater to an on -site treatment system prior to discharging to a Nation Pollutant Discharge Elimination System (NPDES) permitted outfall. Phase 1 of the clean water infiltration system will consist of a water treatment system to treat surface water from Belews Lake delivered to the treatment system from the Steam Station fire service water main. Compounds added to source water will be consumed during the treatment process and will not be a component of the final infiltration water. After treatment, clean water will be conveyed to 23 clean water infiltration wells for low-pressure (less than five pounds per inch [psi]) delivery to groundwater. The anticipated total flow rates during Phase 1 from the extraction wells and into the infiltration wells are approximately 37 gpm and 37 gpm, respectively, based on modeling results. The proposed pilot test extraction and clean water infiltration well locations were selected to ensure that clean infiltration water will be captured by the pilot test extraction well network. Phase 2 of the groundwater extraction system will include the installation of approximately 76 additional groundwater extraction wells and 51 additional clean water infiltration wells. During Phase 2, the anticipated total flow rates from the extraction wells and into the infiltration wells are approximately 130 gpm and 120 gpm, respectively, based on modeling results. Therefore, expected extraction rates are greater than expected infiltration rates. Based on the distribution of COI and the vertical hydraulic connection through the saprolite, transition, and bedrock zones, Duke Energy is proposing to install the infiltration wells with well screen and/or sand pack material across all three zones. Given the interconnectivity of the hydrostratigraphic zones, Duke Energy is requesting a variance from 15A NCAC 02C .0225 North Carolina Well Construction Standards in accordance with 15A NCAC 02C .0241 based on the following: • Construction of the infiltration wells with screens across the three water -bearing units will allow for more effective remediation of groundwater. June 19, 2020 Page 3 • Site -related COI are present in groundwater in all three zones. • Corrective action to address these COI in groundwater is also proposed in all three zones. • Extraction of groundwater provides the necessary hydraulic connection between the COI- affected groundwater zones and the proposed clean water infiltration. • The proposed well construction is not expected to generate a potential risk to human health or groundwater. • Water supply wells are not located within 500 feet of the proposed extraction wells. The Application for a Permit to Construct or Operate Injection Well(s) is attached, as well as additional supporting information provided for your review and approval. We appreciate the NCDEQ's timely review of this submittal package as we proactively implement the groundwater remediation strategy for this Site. Please contact Mr. Andrew Shull (919.546.2104) or Mr. Scott Davies (980.373.6563) with any questions or concerns regarding this application. Sincerely, Scott E. Davies, P.G. Project Director cc: Rick Bolich, NCDEQ Steve Lanter, NCDEQ Eric Smith, NCDEQ deq.coalash@ncdenr.gov Ed Sullivan, Duke Energy John Toepfer, Duke Energy Andrew Shull, Duke Energy Melonie Martin, Duke Energy Matthew Allen, AECOM Bob Wyrick, AECOM Attachments Attachment A — UIC Permit Application (Injection Well Type "Other") Attachment B — Well Construction Schematics Attachment C — Operating Design Table C-1 — Infiltration System Design Parameters Figure C-1 — Groundwater Treatment System Process Flow Diagram Attachment D — Site Maps Figure D-1 — Site Location Map Figure D-2 — Site Map June 19, 2020 Page 4 Figure D-3 — Clean Water Infiltration Well Area Figure D-4 — Existing Groundwater Elevations and Flow Paths (Shallow Flow Zone) Figure D-5 — Existing Groundwater Elevations and Flow Paths (Deep Flow Zone) Figure D-6 — Predicted Groundwater Flow Paths Attachment A UIC Permit Application Injection Well Type "Other" NC DEPARTMENT OF ENVIRONMENTAL QUALITY — DIVISION OF WATER QUALITY APPLICATION FOR A PERMIT TO CONSTRUCT OR OPERATE INJECTION WELL(S) INJECTION WELL TYPE "OTHER" The proposed UIC well(s) may be permitted per 15A NCAC 02C .0240 (check one) x New Application Renewal* Modification * For renewals complete Parts A-C and I, the signature page. Print or Type Information and Mail to the Address on the Last Page. Illegible Applications Will Be Returned As Incomplete. DATE: June 18, 2020 PERMIT NO. (leave blank if New Application) A. STATUS OF APPLICANT (choose one) Non -Government: Individual Residence Business/Organization x Government: State Municipal County Federal B. WELL OWNER/PERMIT APPLICANT — For individual residences, list owner(s) on property deed. For all others, list name of entity/corporation, name of person delegated authority to sign on behalf of the business or agency, and the title of the individual: Duke Energy Carolinas, LLC James Wells, Vice President EHS Programs & Environmental Sciences Mailing Address: 526 South Church Street, Mail Code EC12J City: Charlotte State: NC Zip Code: 28202-1803 County: Mecklenburg Day Tele No.: Cell No.: EMAIL Address: iames.wellsLyAuke-energv.com Fax No.: C. WELL OPERATOR (if different from well owner) — For individual residences, list owner(s) on property deed. For all others, list name of entity/corporation, name of person delegated authority to sign on behalf of the business or agency, and the title of the individual:: same as above Mailing Address: City: State: Zip Code: County: Day Tele No.: Cell No.: EMAIL Address: Fax No.: Page 1 D. LOCATION OF WELL SITE — Where the injection wells are physically located: (1) Parcel Identification Number (PIN) of well site: 6982642715, 6982185694 County: Stokes (2) Physical Address (if different than mailing address): Belews Creek Steam Station 3195 Pine Hall Road City: Belews Creek State: NC Zip Code: 27009 E. WELL DRILLER INFORMATION (if known) Well Drilling Contractor's Name: To be determined, drilling Request for Proposal out for bids NC Well Drilling Contractor Certification No.: TBD Company Name: Contact Person: EMAIL Address: Address: City: Zip Code: State: County: Office Tele No.: Cell No.: Fax No.: F. WELL CONSTRUCTION SPECIFICATIONS (Included as Attachment B) (1) Specify the number and type of wells to be used for the system: *EXISTING WELLS 74 PROPOSED WELLS *For existing wells, please attach a copy of the Well Construction Record (Form GW-1) if available. (2) Attach a schematic diagram of each injection well serving the system. A single diagram can be used for wells having the same construction specifications as long as the diagram clearly identifies or distinguishes each well from one another. Well construction for Injection Well Type "Other" most closely resembles construction in 15A NCAC 02C .0224 for injecting water only. The proposed construction shall include, but not be limited to, the following: (a) Depth of each boring below land surface (b) Well casing and screen type, thickness, and diameter (c) Casing depth below land surface (d) Casing height "stickup" above land surface (e) Grout material(s) surrounding casimg and depth below land surface Note: bentonite grouts are prohibited for sealing water -bearing zones with 1500 mg/L chloride or greater (f) Length of well screen or open borehole and depth below land surface (g) Length of sand or gravel packing around well screen and depth below land surface Page 2 G. H. I. OPERATING DESIGN (Included as Attachment C) At a minimum include as attachments engineering plans for the entire system, showing treatment of the water (if any), details of recovery, injection, monitoring wells and infiltration galleries, operating schedule including any periodic shut -down times, and provisions to ensure the system will continue to function if the system fails, such as standby power capability, complete system -off status, or d uplicity of system components. Also, provide any other relevant information on the proposed system including the following: (1) Injection Rate: Average (daily): gallons per minute (gpm). (2) Injection Volume: Average (daily): gallons per day (gpd). (3) Injection Pressure: Average (daily): pounds/square inch (psi). (4) Injection Temperature: Average (January) ° F, Average (July) ° F. SITE MAP (Included as Attachment D) — Attach a site -specific map that is scaled or otherwise accurately indicates distances and orientations of the specified features from the injection well(s). The site map shall include the following: (1) All water supply wells, monitoring wells, surface water bodies, and septic systems including drainfield, waste application area, and repair area located within 250 feet of the injection well(s). (2) Any other potential sources of contamination located within 250 feet of the proposed injection well(s). (3) Property boundaries located within 250 feet of the parcel on which the proposed injection well(s) are to be located. (4) An arrow orienting the site to one of the cardinal directions (north, south, west, or east). (5) Hydrogeologic Conditions including contours of existing groundwater elevations, predicted groundwater elevations resulting from the proposed injection, and predicted flow paths in the horizontal and vertical planes. This information must be sealed by a North Carolina licensed engineer or geologist. CERTIFICATION (to be signed as required below or by that person's authorized agent) Per 15A NCAC 02C .0211 all permit applications shall be signed as follows: 1. for a corporation: by a responsible corporate officer; 2. for a partnership or sole proprietorship: by a general partner or the proprietor, respectively; 3. for a municipality or a state, federal, or other public agency: by either a principal executive officer or ranking publicly elected official; 4. for all others: by the well owner (person(s) listed on the property deed). If an authorized agent is signing on behalf of the applicant, then supply a letter signed by the applicant that names and authorizes their agent to sign this application on their behalf. "I hereby certify, under penalty of law, that I have personally examined and am familiar with the information submitted in this document and all attachments thereto and that, based on my inquiry of those individuals immediately responsible for obtaining said information, I believe that the information is true, accurate and complete. I am aware that there are significant penalties, including the possibility of fines and imprisonment, for submitting false information. I agree to construct, operate, maintain, repair, and if applicable, abandon the injection well and all related appurtenances in accordance with the approved specifications and conditions of the Permit." 0 WV, / Signature of Property Owner/Applicant James Wells, Vice President EHS Programs and Environmental Sciences Print or Type Full Name and Title Page 3 Submit two copies of the completed application with attachments to: Division of Water Resources — UIC Program 1636 Mail Service Center Raleigh, NC 27699-1636 Page 4 Attachment B Well Construction Schematics U m m 0 m E E m m m d L a FIBERGLASS INSULATED ABOVE GRADE STRUCTURE ALUMINUM SANITARY WELL CAP WITH SEAL, TYP 1.5 INI STILLING WELL 11N 316L SS PITILESS ADAPTOR 11N 316E SS PIPE TO ABOVE WELL SEAL MANIFOLD I i 1 IN SS UNION ONCRETE PAD 1 IN HDPE TRANSITION FITTING- 11N HDPE DROP 61N 101N BENTONITE GROUT BENTONITE SEAL 0 FILTER PACK SILICA SAND (20/30) 1 IN HDPE TRANSITION FITTING 11N SPRING LOADED CHECK VALVE PRESSURE TRANSDUCER (DEPTH VARIES) m 61N 304L SS WIRE -WRAPPED SCREEN (0.010 IN SLOT) THREADED ONTO CASING FOR RISER FLAT BOTTOM SS THREADED PLUG AT BOTTOM OF SCREEN TYPICAL INFILTRATION WELL DETAIL NOT TO SCALE NOTES: 1. ALL DEPTHS ARE APPROXIMATED AND MAY CHANGE DEPENDING ON SITE CONDITIONS. 2. FLOWRATES ARE AVERAGE FLOWRATES FROM SIMULATIONS AND APPROXIMATE AND MAY CHANGE DEPENDING ON SITE CONDITIONS. 3. OPERATIONAL WATER LEVELS ARE APPROXIMATE AND MAY CHANGE DEPENDING ON SITE CONDITIONS. 4. IN - INCH 5. FT - FEET 6. FT BGS - FEET BELOW GROUND SURFACE 7. GPM - GALLONS PER MINUTE 8. NA - NOT APPLICABLE 9. TYP - TYPICAL 10. EASTING AND NORTHING PROJECTED IN NAD 83 - NORTH AMERICAN DATUM 1983 11. ELEVATIONS IN NAVD 88 - NORTH AMERICAN VERTICAL DATUM OF 1988 12. WELL CASING SHALL BE SCHEDULE 40 PVC (FOR WELLS LESS THAN 130 FT BGS), SCHEDULE 80 PVC (FOR WELLS GREATER THAN 130 FT BGS), CARBON STEEL OR STAINLESS STEEL. 13. A BENTONITE SEAL SHALL BE INSTALLED ABOVE THE TOP OF THE FILTER PACK AND CONSIST OF AT LEAST 3 FT OF BENTONITE PELLETS, CHIPS OR ENGINEER APPROVED SLURRY. 14. A BOREHOLE ANNULUS BETWEEN THE BENTONITE SEAL AND THE GROUND SURFACE SHALL BE FILLED WITH A BENTONITE-CEMENT SLURRY MIXED IN THE FOLLOWING RATIO: 50 LBS PORTLAND CEMENT, 2.5 LBS POWDERED BENTONITE AND NO MORE THAN 5 GALLONS OF WATER. Vertical Infiltration Wells Well ID Approximate Ground Surface Elevation (feet, NAVD SS) Pressure at Well Head (ft of Head Above Ground Surface) Well Depth (ft BGS) Screen Bottom (ft BGS) Screen Top (ft BGS) Screen Length (ft) Filter Pack Top (ft BGS) Well Construction Details Targeted Flow Zones Approximate Simulated Flow (gpm) A (in) B (ft) C (ft) D (ft) E (ft) F in G (ft) IW-3 753 10 1 25 1 25 10 15 7 6 15 18 3 4 18 25 Saprolite 2.5 IW-4 746 10 30 30 10 20 7 6 20 23 3 4 18 30 Saprolite 2.5 IW-6 751 10 170 149 129 20 126 6 20 135 3 32 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-7 763 10 35 35 15 20 12 6 20 23 1 3 9 18 35 Saprolite 2.5 IW-9 743 10 165 165 145 20 142 6 20 130 3 32 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-10 768 10 180 180 160 20 157 6 20 145 3 32 18 180 Saprolite/Transition Zone/Bedrock 1.6 IW-12 723 10 145 145 125 20 122 6 20 1101 3 32 18 145 Saprolite/Transition Zone/Bedrock 1.6 IW-13 757 10 170 170 150 20 147 6 20 1351 3 32 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-14 773 10 185 185 165 20 162 6 20 150 3 32 18 185 Saprolite/Transition Zone/Bedrock 1.6 IW-15 730 10 155 155 135 20 132 6 20 120 3 32 18 155 Sa rolite/Transition Zone/Bedrock 1.6 IW-16 744 10 160 160 140 20 137 6 20 125 3 32 18 160 Saprolite/Transition Zone/Bedrock 1.6 IW-17 769 10 180 180 160 20 157 6 20 145 3 32 18 180 Saprolite/Transition Zone/Bedrock 1.6 IW-19 764 10 175 175 155 20 152 6 20 140 3 32 18 175 Saprolite/Transition Zone/Bedrock 1.6 IW-20 734 10 150 150 130 20 127 6 20 115 3 32 18 150 Saprolite/Transition Zone/Bedrock 1.6 IW-21 753 10 165 165 145 20 142 6 20 130 3 32 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-22 767 10 70 70 50 20 47 6 20 35 3 32 18 70 Saprolite/Transition Zone 1.6 IW-23 717 10 145 145 125 20 122 6 20 110 3 32 18 145 Saprolite/Transition Zone/Bedrock 1.6 IW-24 760 10 170 170 150 20 147 6 20 135 3 32 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-25 745 10 155 155 135 20 132 6 20 120 3 32 18 155 Saprolite/Transition Zone/Bedrock 1.6 IW-26 766 10 175 175 155 20 152 6 20 140 3 32 18 175 Saprolite/Transition Zone/Bedrock 1.6 IW-27 737 10 155 155 135 20 132 6 20 120 3 32 18 155 Saprolite/Transition Zone/Bedrock 1.6 IW-28 760 10 170 170 150 20 147 6 20 135 3 32 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-29 745 10 160 160 140 20 137 6 20 125 3 32 18 160 Saprolite/Transition Zone/Bedrock 1.6 IW-30 760 10 170 170 1 150 20 1 147 6 20 135 3 32 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-31 756 10 165 165 145 20 142 6 20 134 3 28 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-32 749 10 160 160 140 20 137 6 20 125 3 32 18 160 Saprolite/Transition Zone/Bedrock 1.6 IW-33 L 749 10 160 160 140 20 137 6 1 20 1 1361 3 21 18 1601 Saprolite/Transition Zone/Bedrock 1.6 IW-34 735 10 155 155 135 20 132 6 20 120 3 32 18 155 Saprolite/Transition Zone/Bedrock 1.6 IW-35 748 10 160 160 140 20 137 6 20 137 3 20 18 160 Saprolite/Transition Zone/Bedrock 1.6 IW-36 748 10 160 160 140 20 137 6 20 1251 3 32 18 160 Saprolite/Transition Zone/Bedrock 1.6 IW-37 751 10 165 165 145 20 142 6 20 1301 3 32 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-38 751 10 160 160 140 20 137 6 20 1341 3 23 18 160 Saprolite/Transition Zone/Bedrock 1.6 IW-39 754 10 165 165 145 20 142 6 20 1361 3 26 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-40 749 10 165 165 145 20 142 6 20 130 3 32 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-42 1 755 10 165 165 145 20 142 6 20 1301 3 32 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-43 741 10 160 160 140 20 137 6 20 125 3 32 18 1 160 Saprolite/Transition Zone/Bedrock 1.6 IW-44 756 10 165 165 145 20 142 6 20 134 3 28 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-45 757 10 170 170 150 20 147 6 20 138 3 29 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-46 751 10 165 165 145 20 142 6 20 130 3 32 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-47 745 10 160 160 140 20 137 6 20 125 3 32 18 160 Saprolite/Transition Zone/Bedrock 1.6 IW-48 761 10 170 170 150 20 147 6 20 134 3 33 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-50 757 10 170 170 150 20 147 6 20 135 3 32 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-51 761 10 170 170 150 20 147 6 20 134 3 33 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-52 747 10 165 165 145 20 1 142 6 20 130 3 32 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-53 759 10 170 170 150 20 147 6 20 146 3 21 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-54 761 10 170 170 150 20 147 6 20 146 3 21 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-55 733 10 155 155 135 20 132 6 20 120 3 32 18 155 Saprolite/Transition Zone/Bedrock 1.6 IW-56 754 10 170 170 150 20 147 6 20 135 3 32 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-57 744 10 160 160 140 20 137 6 20 125 3 32 18 160 Saprolite/Transition Zone/Bedrock 1.6 IW-58 758 10 170 170 150 20 147 6 20 135 3 32 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-59 765 10 175 175 155 20 152 6 20 151 3 21 18 175 Saprolite/Transition Zone/Bedrock 1.6 IW-60 749 10 165 165 145 20 142 6 20 130 3 32 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-61 754 10 170 170 150 20 147 6 20 135 3 32 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-62 765 10 175 175 155 20 152 6 20 151 3 21 18 175 Saprolite/Transition Zone/Bedrock 1.6 IW-63 766 10 175 175 155 20 152 6 20 151 3 21 18 175 Saprolite/Transition Zone/Bedrock 1.6 IW-64 741 10 165 165 145 20 142 6 20 1301 3 32 1 18 165 Saprolite/Transition Zone/Bedrock 1.6 IW-65 766 10 175 175 155 20 152 6 20 151 3 21 18 175 Saprolite/Transition Zone/Bedrock 1.6 JML 739 160 20 137 6 20 125 3 32 18 160 Saprolite/Transition Zone/Bedrock 1.6 IW-67 764 10 175 175 155 20 152 6 20 151 3 21 18 175 Sa p rolite Transition Zone Bedrock 1.6 IW-68 763 10 175 175 155 20 152 6 20 151 3 21 18 175 Saprolite/Transition Zone/Bedrock 1.6 IW-69 759 10 175 175 155 20 152 6 20 151 3 21 18 17 5 Saprolite/Transition Zone/Bedrock 1.6 IW-70 759 10 175 175 155 20 152 6 20 151 3 21 18 175 Saprolite/Transition Zone/Bedrock 1.6 IW-71 761 10 175 175 155 20 152 6 20 151 3 21 18 175 Saprolite/Transition Zone/Bedrock 1.6 IW-72 757 10 175 175 155 20 152 6 20 151 3 21 18 175 Sa rolite/Transition Zone/Bedrock 1.6 IW-74 52 10 170 170 150 20 147 6 20 135 3 32 18 170 Sa mlite/Transition Zone/Bedrock 1.6 IW-75 53 10 175 175 155 20 152 6 20 140 3 32 18 175 Saprolite/Transition Zone/Bedrock 1.6 IW-76 756 10 180 180 160 20 157 6 20 1451 3 32 18 180 Saprolite/Transition Zone/Bedrock 1.6 IW-85 752 10 170 170 150 1 20 147 6 20 1351 3 32 18 170 Saprolite/Transition Zone/Bedrock 1.6 IW-86 675 10 130 130 110 20 107 6 20 95 1 3 32 18 130 Saprolite/Transition Zone/Bedrock 1.5 IW-87 758 10 225 225 205 20 202 6 20 190 13 32 18 225 Saprolite/Transition Zone/Bedrock 1.5 IW-88 716 10 200 200 180 20 177 6 20 165 3 18200 Saprolite/Transition Zone/Bedrock 1.5 IW-89 660 10 145 145 125 20 122 6 20 110 3 18 145 Saprolite/Transition Zone/Bedrock 1.5 IW-90 647 10 135 135 115 20 112 6 20 100 3 L32 18 135 Saprolite/Transition Zone/Bedrock 1.5 IW-91 638 10 130 130 110 20 107 6 20 95 3 18 130 Saprolite/Transition Zone/Bedrock 1.5 NOTES: 1. UNSHADED WELLS WILL BE INSTALLED DURING PHASE 1. 2. PHASE 2 INFILTRATION WELLS. 3. CONSTRUCTION DETAILS SHOWN ABOVE ARE APPROXIMATED AND WILL BE DETERMINED BASED ON FIELD DATA COLLECTED AT A LATER DATE. 4. NA - NOT AVAILABLE 5. REFER TO FIGURE 4-2 FOR WELL LOCATIONS. A=COM PROJECT UIC PERMIT APPLICATION BELEWS CREEK STEAM STATION 3195 Pine Hall Road Belews Creek, North Carolina 27009 PREPARED FOR DUKE ENERGY (OWNER) 3195 Pine Hall Road Belews Creek, North Carolina 27009 PREPARED BY AECOM 1600 Penmeter Park Drive, Suite 400 Morrisvile, North Carolina27560 919.461.1100 tel 919.461.1415 fax www.aecom.com REGISTRATION ISSUE / REVISION DATE 2020-04-29 PROJECT NUMBER 60442330 SHEET TITLE ATTACHMENT B WELL CONSTRUCTION SPECIFICATIONS SHEET NUMBER Attachment C Operating Design • Table C-1 — Infiltration System Design Parameters • Figure C-1 — Infiltration Water Treatment System Process Flow Diagram Attachment C Clean Water Infiltration System Operating Design UIC Permit Application Belews Creek Steam Station Belews Creek, North Carolina The proposed clean water infiltration system will include a pre -infiltration water treatment system, seventy- four (74) vertical clean water infiltration wells, conveyance piping, pumps, and associated equipment and instrumentation. Water used for the clean water infiltration system will be conveyed from the Belews Creek Steam Station fire service water main to the water treatment system. Water for the fire service water main is derived from Belews Lake (see Figure D-2). Duplex pumps will be utilized to convey water from the fire service water main to the infiltration water treatment system. Following the receipt of analytical results from the Belews Lake surface water samples, AECOM will design the infiltration water treatment system to treat surface water prior to low-pressure introduction to groundwater through the infiltration well network. AECOM anticipates the infiltration water treatment system could possibly require the following process treatment components: • Initial Filtration (e.g.: Disposable cartridge filters) • Chemical and mechanical precipitation (e.g.: Sodium hydroxide') • Disinfection (e.g.: Ultraviolet light) • pH adjustment (e.g.: Sulfuric acid', acetic acid') • Final filtration prior to discharge (e.g.: Disposable cartridge filters) Compounds added to source water will be consumed during the treatment process and will not be a component of the final infiltration water. Samples will be collected to evaluate treatment system effectiveness prior to infiltration water delivery to groundwater. Parallel treatment processes will be utilized to facilitate infiltration system operation and maintenance and help achieve optimal runtime and performance. Individual system components (turbine pumps, equalization tanks, modular treatment system units, and transfer pumps) will be capable of operating singularly or in parallel to achieve maximum infiltration water production capacity and system redundancy. The infiltration well system controls and monitoring equipment will be housed in an enclosed structure to prevent exposure to prevailing weather conditions. A conceptual process flow diagram for the groundwater treatment system is included as Figure C-1. In the event of a system malfunction or power loss in any part of the infiltration water treatment or pumping systems, the system control logic will have redundant safeguards designed to shut off water conveyance to infiltration treatment system and clean water infiltration wells to prevent untreated surface water from entering the infiltration wells. Following treatment, infiltration water will be pumped to parallel equalization tanks, each capable of handling the total system flow in the event maintenance is required on either tank. Clean infiltration water will then be conveyed to an infiltration water control and distribution system building that will house the manifold legs of each clean water infiltration well. Manifold legs will include a solenoid shutoff valve, a flow control valve, and flow and pressure transmitters. The transmitters will communicate with the system PLC to monitor clean water infiltration system operation. HDPE piping will then convey infiltration water from the manifold to each infiltration well (well schematic included in Attachment B). Table C-1 includes the design injection rate, pressure, and water temperature at each clean water infiltration well. On/off valves in the system will normally closed (power to open) to ensure infiltration line shutdown in the event of a power failure. 1. Additive approved by the North Carolina Department of Health and Human Services to inject into groundwater. Table C-1 UIC Permit Application Belews Creek Steam Station Belews Creek North Carolina Estimated Flow Estimated Flow Maximum Pressure at Injection Temperature, Injection Temperature, Well ID (gpm) (gpd) Well Head (psi) January (°F)' July (°F)' Individual Infiltration 1.5 - 2.5 2,160 - 3,600 5 58 82 Wells Phase 1 36.8 52,992 5 58 82 Pilot -Scale System) Phase 2 120.5 173,520 5 58 82 Full -Scale System) Notes and Abbreviations 1.Injection temperatures based off the Water Temperature Table of the Southern Atlantic Coast (Wilmington, NC) provided by the National Centers for Environmental Information, National Oceanic and Atmospheric Administration. -- = Not applicable °F = Degrees Fahrenheit gpd = gallons per day gpm = Gallons per minute psi = pounds per square inch 46"=com 0 a CD 2 a a Q L A Z6 A a� aEi co r- co U CD O d U z Y� w w U n w V w a U) w J w 00 000 oU w , of 60 N -0p �U ow aQ Nw cu J i �o ao w �z (.60 o— o75 N z 00 N � zm0, �� m cwn �U c� �cu c_ J LL EQUALIZATION TANK 2 NOTE: 1. ANTICIPATED INFILTRATION WATER TREATMENT SYSTEM COMPONENTS ARE PROVISIONAL. THE FINAL TREATMENT SYSTEM DESIGN WILL BE CONDUCTED FOLLOWING ADDITIONAL SURFACE WATER SAMPLING. COMPOUNDS ADDED TO SOURCE WATER WILL BE CONSUMED DURING THE TREATMENT PROCESS AND WILL NOT BE A COMPONENT OF THE FINAL INFILTRATION WATER. ANALYTICAL SAMPLES WILL BE USED TO EVALUATE INFILTRATION WATER TREATMENT SYSTEM EFFECTIVENESS PRIOR TO DELIVERY TO GROUNDWATER. CLEAN WATER INFILTRATION SYSTEM PROCESS FLOW DIAGRAM EXTRACTION SYSTEM PROCESS FLOW DIAGRAM PROJECT UIC PERMIT APPLICATION BELEWS CREEK STEAM STATION 3195 Pine Hall Road Belews Creek, North Carolina 27009 PREPARED FOR DUKE ENERGY (OWNER) 3195 Pine Hall Road Belews Creek, North Carolina 27009 PREPARED BY AECOM 1600 Perimeter Park Drive, Suite 400 Morrisville, North Carolina 27560 919.461.1100 tel 919.461.1415 fax www.aecom.com REGISTRATION 3 2020-06-1 E ISSUE AS DRAFT 2 2020-06-1 C ISSUE AS DRAFT 1 2020-05-07 ISSUE AS DRAFT 0 2020-05-0 FOR INTERNAL REVIE /R DATE DESRIPTION l8tLOW$aILIvia.] PROJECT NUMBER 60442330 SHEET TITLE FIGURE C-1 GROUNDWATER TREATMENT SYSTEM PROCESS FLOW DIAGRAM SHEET NUMBER �� Attachment D Site Maps • Figure D-1 — Site Location Map • Figure D-2 — Site Map • Figure D-3 — Clean Water Infiltration Well Area • Figure D-4 — Existing Groundwater Elevations and Flow Paths (Shallow Flow Zone) Note: Figure D-4 was originally developed for the Demonstration of Hydraulic Control for Belews Creek COls Technical Memorandum (Synterra, 2020) and has not been altered for inclusion in this permit application. • Figure D-5 — Existing Groundwater Elevations and Flow Paths (Deep Flow Zone) Note: Figure D-5 was originally developed for the 2020 Effectiveness Monitoring Report for Belews Creek Steam Station (Synterra, 2020) and has not been altered for inclusion in this permit application. • Figure D-6 — Predicted Groundwater Flow Paths Note: Figure D-6 was originally developed for the Demonstration of Hydraulic Control for Belews Creek COls Technical Memorandum (Synterra, 2020) and has not been altered for inclusion in this permit application. The figure demonstrates the modeled groundwater extraction system area of influence. Based on this analysis, all clean water infiltration wells will be installed within the groundwater extraction system area of influence. DAN R� ` 1� 1 (1 if- 600 J� a r�1 �� • oo � �s . \� o SH BASIN GEOGRAPHIC LIMITATION LINED RETENTION BASIN 7 ASH BASIN-, 11� � 1nl 20 i PARCEL LINE O l CD 0 Bnn COAL PILE o BELEWS CREEK STEAM TATION ' 9 PINE HALL ROAD LANDFILL` UC C (CLOSED) STRUCTURAL FILL (CLOSED) � c FG6 LANDFILL 30C 13u j D NOTES: 1 1. 2016 USGS TOPOGRAPHIC MAP, BELEWS LAKE QUADRANGLE, OBTAINED FROM THE USGS STORE AT https://stDm.usgs.gov/map-IocatDn 2. THE LOCATIONS OF ALL BOUNDARIES, REMED IATION AND MONITORING WELLS, AND WETLANDS WERE PROVIDED BY SYNTERRA CORPORATION AND ORIGINALLY DOCUMENTED IN THE CORRECTIVE ACTION PLANUPDATE (DECEMBER 2019)AND THE DEMONSTRATION OF 02L COMPLIANCE FOR THE BELEWS CREEK ASH BASIN BY DECEMBER 31, 2019 TECHNICAL MEMORANDUM (MARCH 2O20)AND SHOULD BE CONSIDERED APPROXIMATE. STOKES DUKE ENERGY. COUNTY CAROLINAS WINSTONSC ASHEVILLE • A'CO • CRAIG ROAD LANDFILL E v U FIGURE D-1 3 SITE LOCATION MAP BELEWS CREEK STEAM STATION PILOT STUDY WORK PLAN 9 BELEWS CREEK, NORTH CAROLINA o DRAWN BY: T. EISCHEN DATE: 05/05/2020 GRAPHIC SCALE / REVISED BY: DATE: 1,000 0 1'000 2,000 r CHECKED BY: DATE: APPROVED BY: DATE: (IN FEET) PROJECT MANAGER: U ater Infiltration Area are D-3) ar+ 3 ---- ---' �: rnINN �----1----- - - - - - - - 1Y-`------ ' r N � 1 -iil _ 1 • 4 .1 1 �. r 1�. r O '',lilt I 0 I I I I I 1 d 1 NO -ES'. 1. BASED ON THE CORRECTIVE ACTION PLAN UPDATE (DATED DECEMBER 31. 2019) PREPARED BY SYNTERRA CORPORATION, THERE ARE NO PROPERTY BOUNDARIES, POTENTIAL RECEPTORS, WATER SUPPLY WELLS, SEPTIC SYSTEMS, OR OTHER SOURCES OF CONTAMINATION LOCATED WITHIN 250 FEET OF THE PROPOSED CLEAN WATER INFILTRATION WELLS. MULTIPLE MONITORING WELLS AND SURFACE WATER BODIES ARE LOCATED WITHIN 250 FEET OF THE PROPOSED CLEAN WATER INFILTRATION WELLS. 2. THE WATERS OF THE US HAVE NOT BEEN APPROVED BY THE US ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND STREAMS BOUNDARIES WERE OBTAINED FROMAMEC FOSTER WHEELER ENVIRONMENTAL& INFRASTRUCTURE, INC. NATURAL RESOURCE TECHNICAL REPORT FOR BELEWS CREEK STEAM STATION DATED JULY 2, 2015. 3. ALL BOUNDARIES AND SITE FEATURE LOCATIONS WERE PROVIDED BY SYNTERRA CORPORATION AND SHOULD BE CONSIDERED APPROXIMATE. 4. AERIAL PHOTOGRAPHY OBTAINED FROM ESRI ARCGIS WORLD IMAGERY SERVER 5. DRAWING HAS BEEN SET WITHA PROJECTION OF NORTH CAROLINA STATE PLANE COORDINATE SYSTEM FIPS 3200 N" GRAPHIC SCALE DUKE 0 350 700 1,400 2,100 ENERGY. Feet DRAWN BY: T. EISCHEN DATE: 1512112121 =COM REVISED BY: DATE: APPROVED BY: DATE: APPROVED BY: DATE: PROJECT MANAGER: N A LEGEND DUKE ENERGY CAROLINAS PROPERTY LINE ;-------, ADJACENT PROPERTY BOUNDARIES FIGURE D-2 SITE MAP UIC PERMIT APPLICATION BELEWS CREEK STEAM STATION BELEWS CREEK, NORTH CAROLINA Q J 0 Q CL a 76 U a� U Y a > c U) Q) 0 E a) p 0) ca j w Q� U w o � 0'Q MI Q U� U� z Y� w w U UI w J w m w� Y D Q 0 N O N 1 ao 1 w m U U Q Q U U U w 0 O a z —I O U w Qi U) Q w t7 Y w w U UI w J w m wCD rnY W '^ O U) N U ow N � a)� o a J z w 0U r 0 1 CD C)/ N Y CD 04 0 w Y z zm OO U� z� m �j �U a) CU E Cn cU N aa) J LL �\ 1I 11 II �� CCR-13BR CCR-13S \ VCCR-13D O O ♦ �� . O O O / O I W-23 Q 11 •. \ I � I I I � GWA-30D QD GWA-30S I � I � I � � O O O / O I W-64 IW-15 Q Q / C1 GWA-21 D GWA-11 S GWA-11 D O I W-55 j% V / . GWA-21 S Q I W-66 I W-76 IW-12 Q / / O I W-34 Q I W-43 Q I W-75 O Q QIW--570 pIW-74 2 Q I W-73 CCR-4D GO CCR-4S I W-47 I W-52 I W-60 0 QO ,/ A IW-72 / IW-56 00 IW-70 A IW-71 0 I W-27 A I W-40 Q � 2 1 W-61 \A I W-69 / 0 O 0 QIW-68 IW-20 Q IW-46A Q IW-58 • O EXOB-1 I W-36 I W-50 0 0 I W-67 O '-,,A � I W-65 O / / 0 \A IW-16 Q ❑ EX-01 IW-42\.0 0 O IW-63 / IW-32 Q- 3� Q IWO I W-62 O IW 45 O O O IW-13 A IW-29 A A O7-� IW-59 �IW54 ❑ EX-02OIW37 �'GWA-20DOIW-25 A01 OIW-44 GWA-20S IW-21 Q IW-3801W-48 IW-10 A W-39 / GWA-20SA 0 I W-33 O A— I W-35 ❑ EX-03 / / IW-19 Q O O GWA-20BR I W-24 Q Q I W-31 Q A I W-30 IW-17 A O Q IW-28 GWA-27BR / ❑ EX-04 I W-26 Q / • I W-22 Q GWA-27D /' / ❑ EX-05 GWA-27 S \ O IW-14 Q \\ O IW-3 Q O O O �\ GWA-19D GWA-19SA 0 \\ O O\\ 0 GWA-19BR Q IW-7 GWA-19S O 0 O O I W-4 Q GWA-10S C� 0 GWA-10D / O GWA-10DA OQ O EXOB-2 v0 / ❑ EX-06 / op" / ❑ EX-07 ❑ EX-08 ❑ EX-09 / ❑ EX-10 / CCR-2D CCR-2S LEGEND Duke Energy Carolinas Belews Creek Plant Site Boundary Stream GWA-18S Wetland (AMEC NRTR) ❑ Existing Extraction Well GWA-18SA �GWA-18D / / O Monitoring Well A Proposed Clean Water Infiltration W / O Proposed Extraction Well / 250-foot Radius around Proposed low Clean Water Infiltration Wells 00 Of GWA-1 BR 1 GWA-1S--7g I GWA-1 D C NOTES 00000' /- o op OP O 10 O / 1 I*] O I W-79 A O I W-78 AO O CCR-5S 8 CCR-5D AB-1 S AB-1 D AB-1 BR O AB-1 BRD 1. Based on the Corrective Action Plan Update (dated December 31, 2019) prepared by Synterra Corporation, there are no property boundaries, potential receptors, water supply wells, septic systems, or other sources of contamination located within 250 feet of the proposed clean water infiltration wells. Multiple monitoring wells and surface water bodies are located within 250 feet of the proposed clean water infiltration wells. ASH BASIN 0 o O / O 1 O I W-82 IW81A AIW-83 I IW-80 A MW-200S CD MW-200D O O MW-200BR 1 O O O / O / d� BC-150 WET WELL CCR-6D CD CCR-6S MW-102D (D MW--102S MW-101 D (Q MW-101 S AB-2D DAM AB-2BR/BRD O O AB-2SA AB-2S SOURCE NOTES 1. The aerial photograph was taken from Google Earth, dated 2020-02-03. 2. The locations of all boundaries and monitoring wells were provided by Synterra Corporation and originally documented in the Corrective Action Plan Update (December 2019). 3. The locations of all remediation wells were provided by Synterra Corporation and should be considered approximate. 4. The locations of streams and wetlands were originally documented in the 2015 AMEC Natural Resources Technical Reports. 100 0 100 200 SCALE IN FEET: 1" = 100' CCR-7S CCR-7D L=Com PROJECT BELEWS CREEK STEAM STATION UIC PERMIT APPLICATION BELEWS CREEK STEAM STATION 3195 Pine Hall Road Belews Creek, North Carolina 27009 PREPARED FOR DUKE ENERGY (OWNER) 3195 Pine Hall Road Belews Creek, North Carolina 27009 PREPARED BY AECOM 1600 Perimeter Park Drive, Suite 400 Morrisville, North Carolina 27560 919.461.1100 tel 919.461.1415 fax www.aecom.com REGISTRATION ISSUE / REVISION 2 2020-06-18 ISSUED AS DRAFT 1 2020-05-22 ISSUED AS DRAFT 0 2020-05-21 FOR INTERNAL REVIEW I/R DATE DESRIPTION DATE 2020-06-18 PROJECT NUMBER 60629990 SHEET TITLE D-3 CLEAN WATER INFILTRATION WELL AREA SHEET NUMBER Figure D-4 Existing Groundwater Elevations and Flow Paths Shallow Flow Zone NOTES: 1. SITE FEATURES ARE FOR 2020 SITE CONDITIONS. % 2. WATER LEVELS WERE COLLECTED ON APRIL 6, 2020. O .�rn�, % o�3. NM -NOT MEASURED DUE TO INSUFFICIENT WATER. o 4. ASH BASIN ELEVATION AS OF APRIL 6, 2020. LOWER ELEVATION IS A RESULT OF THE ASH BASIN DECANTING. ppp 5. ELEVATIONS ARE REFERENCED TO THE NORTH AMERICAN VERTICAL DATUM 88 (NAVD 88). 6. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLY AND SHOULD NOT BE USED FOR DESIGN OR ENGINEERING o o J PURPOSES. TOPOGRAPHY IS BASED ON LIDAR BARE EARTH DATA OBTAINED FROM THE NORTH CAROLINASPATIAL DATASITE AT 6 4 https://sdd.nc.gov/sdd/DataDownload.aspx. 6$ 7. THE WATERS OF THE U.S. DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP 6gb CREATION. THIS MAP IS NOT TO BE USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND STREAMS 70= BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND DELINEATION CONDUCTED BY AMEC FOSTER WHEELER �p0 ENVIRONMENTAL & INFRASTRUCTURE, INC. NATURAL RESOURCE TECHNICAL REPORT (NRTR) FOR BELEWS CREEK STEAM STATION / / 726 DATED JULY 2, 2015. 000 GWA-1S 8. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS. / GWA-30S 9. ALL BOUNDARIES ARE APPROXIMATE. CCR-13S �N0 40#1� / 719.02 10. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON 689.59 40 0 ` JUNE 11, 2019. AERIAL WAS COLLECTED ON FEBRUARY 3, 2019. n C DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH E PLANE COORDINATE SYSTEM RIPS 3200 .a (NAD83 2011). (NAD83/20111.�" 'K, 8 00, / i I �Z5 I GWA-21S GWA-11S 718.42 728.60 h' J FORMER PARCEL, I. GWA-27S 736.19 I GWA-1 731.29 GWA-19S GWA-10S 738.88 / 0 I I GWA-18S � o / CCR-4S �_o N V ^�o e NM S NM WA-20SA >SQ \ 35.72 I r / CCR-2S I 737.34 1 1 GWA-18SA ' . 739.20 a I I I \ 5° 739.5739.57 I �4 s • I 710. 100, 4 ,� • 10 7,50 0 �) GWA-24S 3° ♦ 631.71 rn ' 0 so 0 rno 0 o M W-200S GWA-32S i f1 Im is A, , CCR-SS 712.94 ��� -__-Woo ��- 710 NMK�Iovy�' NM GWA-2S NM 000 I� 0 ASH BASiN ,••`"`�H..GRR��''•0 LEGEND • Q' ���� N�d ='� .+ ABANDONED WELL SEAL t17 WELL IN SHALLOW FLOW ZONE II-• INFERRED WATER LEVEL CONTOUR (5' INTERVAL) (NAVD 88) � y Q_ � ASH BASIN WASTE BOUNDARY 4, - - - • ASH BASIN COMPLIANCE BOUNDARY �0 ��j�,,�' FORMER DUKE ENERGY CAROLINAS PROPERTY LINE r'•� """" ,�� �•'" TOPOGRAPHIC CONTOUR (10' INTERVAL) ISB�E����(�/+�ti�t"�• 1 STREAM (AMEC NRTR) frrlJt WETLAND (AMEC NRTR) 0 GROUNDWATER FLOW DIRECTION GRAPHIC SCALE FIGURE 6 (' DUKE 150 0 150 300 GENERALIZED GROUNDWATER LEVEL MAP ENERGY CARf1 (INFEET) SHALLOW FLOW ZONE DRAWN BY: C. CURRIER DATE: 05/29/2020 DEMONSTRATION OF HYDRAULIC CONTROL REVISEDBY: C.CURRIER DATE: 06/04/2020 FOR BELEWS CREEK COIS DBY APPROV:ED BY: BELEWS CREEK STEAM STATION APPROV PROJECTMANAGER: A.ALBERT BELEWS CREEK, NORTH CAROLINA Figure D-5 Existing Groundwater Elevations and Flow Paths (Deep Flow Zone 777 - �0 719.3� �♦ ^/ 0 0 q, a 727.5 C3 00 GWA-21 ?0� 719 �_ 1 0) I • I * ,R-4D 732.9 EXOB-1 �• 733.2 /1 FORMEIR PARCEL A / }01 EX-3 I ►������������ GWA-20D 730.E �° / GWA-27D ����������•`•, �,� o EX-4 737.4 ` 724.E EXOB-2 735.2 I ` EX-5 726.7 EX-6 EX 7 32.3 725.4 EX-8 a �' 712.7 � n O EX-9 715 723.4 CCR7 7 EX-10 1�\ � 712.3 1 I GWA-10DA 735.7 i ! GWA-18D / 739.6 I ir o CCR-1 D .) 4 1 741.2 4� ' f � I 1 I � o r 780 EX-1 /A-1 D a° 717.4 � o � ' � ` , ` ♦' ♦^ ^moo ^ao ` 660 - ` 680- ! � 6so r ` •o `-�'� 720'"�------ 720 720 �-- .i--' 72 0 _ ♦ AB-1D LEGEND � 7zo.s I� �� ` WELL IN DEEP FLOW ZONE 770 EXTRACTION WELL ---INFERRED WATER LEVEL CONTOUR (NAVD 88) 0 ASH BASIN WASTE BOUNDARY - - - - ASH BASIN COMPLIANCE BOUNDARY - - • FORMER DUKE ENERGY CAROLINAS PROPERTY LINE TOPOGRAPHIC CONTOUR (10' INTERVAL) STREAM (AMEC NRTR) WETLAND (AMEC NRTR) o GROUNDWATER FLOW DIRECTION NOTES: 1. SITE FEATURESARE FOR 2020 SITE CONDITIONS. 2. WATER LEVELS WERE COLLECTED ON APRIL 6, 2020. 3. EX-1 THROUGH EX-10 WATER ELEVATIONS ARE AN AVERAGE OF WATER LEVELS RECORDED ON APRIL 6, 2020. 4. ASH BASIN ELEVATION AS OF APRIL 6, 2020. LOWER ELEVATION IS A RESULT OF THEASH BASIN DECANTING. INFERRED AREA OF INFLUENCE 5. ELEVATIONS ARE REFERENCED TO THE NORTH AMERICAN VERTICAL DATUM 88 FROM GROUNDWATER EXTRACTION (NAVD 88). 6. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLY AND SHOULD NOT BE USED FOR DESIGN OR ENGINEERING PURPOSES. TOPOGRAPHY IS BASED ON LI DAR BARE EARTH DATA OBTAI NED FROM THE NORTH CAROLINA SPATIAL DATA SITE AThttps://sdd.nc.gov/sdd/DataDownload.aspx. •i,�ti �+ R I'i rf++ a� '4 �.•""' 7. THE WATERS OF THE U.S. DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT :� {-:,.•'••�� Nt7�,` ++' TO BE USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND 00 Q STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WE a'• y� : + DELINEATION CONDUCTED BYAMEC FOSTER WHEELER ENVIRONMENTAL & INFRASTRUCTURE, INC. NATURAL RESOURCE TECHNICAL REPORT (NRTR) FOR ` SEAL s BELEWS CREEK STEAM STATION DATED JULY 2, 2015. i 2` r 38. i� PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS. ' b c Q� = N i 9. ALL BOUNDARIES ARE APPROXIMATE. •y.C� 10. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JUNE 11, 2019. ,G•� �'� Y�r • .. AERIAL WAS COLLECTED ON FEBRUARY 3, 2019. ++ T " ~ y)+t. C `n p e'� 1� 11. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE RIPS COORDINATE SYSTEM PS 3200 (NAD83/2011). y UVG ► FIGURE 1-4 ('DUKE 100 GRAPHICSCA00 200 ENERGY DEEP FLOW ZONE WATER LEVEL MAP CAR'. (INFEET) APRIL 2020 DRAWN BY: C. WYATT DATE: 04/21/2020 REVISED BY: A. ROBINSON DATE:.6/05/2020 2020 EFFECTIVENESS MONITORING REPORT CHECKEVARD DA. BELEWS CREEK STEAM STATION APPROVED BY: A. ALBERT APPROVED ALBS S1/1'1TPr1'rl PROJECTMANAGER: A.ALBERT BELEWS CREEK, NORTH CAROLINA Figure D-6 Predicted Groundwater Flow Paths Feet (U.S. SUW ] z0 500 0 �x r .z SEAL 2615� LEGEND DUKE DRAWN BY: R. FALTA DATE: 05/15/2020 -•.uauaa.-- FIGURE 5 Clean water infiltration wells \ ENERGY: REVISED BY: DATE: EXTRACTION WELL CAPTURE ZONE CAROLINAS CHECKED BY: A. ALBERT DATE: 05/28/2020 ANALYSIS Extraction wells APPROVED BY: A. ALBERT DATE: 05/28/2020 PROJECT MANAGER: A. ALBERT DEMONSTRATION OF HYDRAULIC CONTROL ---- Compliance Boundary ` FOR BELEWS CREEK COIs Cap ture zone analysis � BELEWS CREEK STEAM STATION extraction well path lines synTerra www.synterracorp.com BELEWS CREEK, NORTH CAROLINA