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Home My WebLink AboutNC0000396_EMC SOC Report_20200423 (5)DUKE ENERGY, April 23, 2020 Via Overnight Mail Landon Davidson Asheville Regional Office Regional Supervisor North Carolina Department of Environmental Quality Division of Water Resources Water Resources - Water Quality Regional Operations 2090 U.S. 70 Highway Swannanoa, NC 28778-8211 Bob Sledge North Carolina Department of Environmental Quality Water Quality Permitting Program Division of Water Resources 1617 Mail Service Center Raleigh, NC 27699-1617 James Wells Vice President Environmental, Health and Safety Programs & Environmental Sciences 526 South Church Street Charlotte, NC 28202 (980) 373.9646 1171-17 - II Water Quality Regional Operations Asheville Regional Office Subject: Report Under Special Order by Consent — EMC SOC WQ S 17-009 Duke Energy Carolinas, LLC — Rogers Energy Complex NPDES Permit NC0005088 2019 Annual Seep Survey Report Dear Messrs. Davidson and Sledge: On behalf of Duke Energy Carolinas, LLC (DEC), I am submitting to you the Rogers Energy Complex Annual Seep Survey Report summarizing the findings of the comprehensive survey as required by the Rogers Energy Complex NPDES Permit NC0005088 Special Order by Consent (SOC), SOC No. S 17-009 Section 2.c.3). As required by the SOC, I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. Messrs. Davidson and Sledge April 23, 2020 Page 2 Please direct any questions concerning the Rogers Energy Complex NPDES Permit NC0005088 SOC No. S 17-009 to Robert Wylie at (704) 382-4669 and to Chris Hallman at (980) 373-7892 relative to the annual seep inspection report. Sincerely, James WeAs Vice President, Environment, Health & Safety - Programs and Environmental Sciences Duke Energy Attachment: Rogers Energy Complex 2019 Annual Seep Survey cc: Richard Baker, Duke Energy Robert Wylie, Duke Energy Chris Hallman, Duke Energy Steve Hodges, Duke Energy Paul Draovitch, Duke Energy Matt Hanchey, Duke Energy 16j synTerra 2019 ANNUAL SEEP REPORT ROGERS ENERGY COMPLEX CLIFFSIDE STEAM STATION EMC SOC WQ S17-009 573 DUKE POWER ROAD MOORESBORO. NC 28114 APRIL 2020 PREPARED FOR fr •� DUKE ENERGY. CAROLINAS DUKE ENERGY CAROLINASf LLC /� A4:�- Tim Grant Project Scientist Scott Spinner, NC LG #2243 Project Manager 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra TABLE OF CONTENTS SECTION PAGE 1.0 INTRODUCTION.........................................................................................................1-1 1.1 Inspection Details......................................................................................................1-1 2.0 FINDINGS.....................................................................................................................2-1 2.1 General Observations...............................................................................................2-1 2.2 Effects of Decanting.................................................................................................. 2-1 2.3 Changes to Seep Status.............................................................................................2-1 3.0 REFERENCES................................................................................................................3-1 LIST OF FIGURES Figure 1 SOC Locations and Inspection Areas LIST OF TABLES Table 1 SOC Locations and Descriptions —2019 Inspection LIST OF APPENDICES Appendix A Photographs Page i 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra LIST OF ACRONYMS EMC Environmental Management Commission SOC Special Order by Consent Page ii 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra 1.0 INTRODUCTION On March 6-7, 2019, Scott Spinner (NC L.G. #2243) of SynTerra inspected the Cliffside Steam Station (Cliffside or Site) property for existing and potential new seeps. No changes to seep status were observed during this inspection. Two previously unidentified seeps were observed. Inspection activities were performed in accordance with North Carolina Environmental Management Commission (EMC) Special Order by Consent (SOC) EMC WQ #517-009. That Special Order by Consent describes inspection requirements as follows: Duke Energy shall conduct annual comprehensive surveys of areas down gradient of ash basins identii ing new seeps, and documenting the physical characteristics of previously documented seeps. All examinations of seeps must include identification of seeps by approximate latitude and longitude and date -stamped digital photographs of their appearance. A report summarizing the findings of the surveys, including a section analyzing the effect decanting of the basin(s) has on seep flows, accompanied by copies of the photographs noted above ("Annual Seep Report"), shall be submitted to DWR in conjunction with submittal of the April 30 quarterly report noted in 2(c)(2) above. This Annual Seep Report moist list any seep that has been dispositioned (as described below) during the previous year, including an analysis of the manner of disposition. All locations listed in Table 1 of the SOC were observed and documented with photographs during the inspection. General inspection observations include: • One previously unidentified seep (5-37) was observed during the inspection. • One previously unidentified seep (5-38) was observed on a follow-up visit after the annual inspection. • No notable changes to existing seep status were observed during this inspection. • Decanting of the active ash basin had not begun at the time of this inspection. 1.1 Inspection Details During the inspection, the weather was clear and no precipitation occurred. The most recent rain event was 0.7 inches on March 3, 2019, according to the on -Site rain gage. Temperatures ranged from approximately 40 to 55 degrees Fahrenheit (F). Page 1-1 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra The inspector reviewed previous seep inspection reports and the weekly dam safety inspection reports pertaining to each ash basin. Patrick Dunn (Duke Energy system owner) conducted the ash basin dam safety inspections and prepared the reports. Mr. Dunn was interviewed about recent rainfall, recent construction/stabilization projects associated with the ash basins, and general Site conditions in and surrounding the ash basins. Observations from the dam safety inspection reports were consistent with observations made during the annual inspection. The inspection included observations in the following areas (Figure 1): • Along the Broad River, north of the Unit 5 inactive ash basin • Between Unit 5 inactive ash basin and Unit 5 power plant • Along the Broad River, northeast of the former Units 1-4 ash basin • Along the Broad River, north of the ash storage area • Along the Broad River, north of the active ash basin • Along the eastern bank of Suck Creek, adjacent to the active ash basin • Areas along and downgradient of the ash basins Seep locations and inspection areas are shown on Figure 1. Observations noted during the inspection are summarized on Table 1. Photographs taken of each seep location during the inspection are included in Appendix A. Page 1-2 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra 2.0 FINDINGS 2.1 General Observations Inspection observations of each seep are described in Table 1. Details include: • Seep conditions were found to be generally similar to conditions in previous inspections. • Seeps S-37 and S-38 were identified as a part of the 2019 inspection and will be incorporated into the monitoring program. Both newly identified seeps exhibited insufficient flow to collect a sample. • No previously unidentified or unreported pipes were observed during inspection. 2.2 Effects of Decanting Decanting of the active ash basin at Cliffside had not yet begun at the time of this inspection. 2.3 Changes to Seep Status Mr. Spinner inspected each seep to evaluate whether it met requirements to be dispositioned in accordance with the SOC. The requirements for dispositioning a seep are as follows: For purposes of this Special Order, "dispositioned" includes the following: (1) the seep is dry for at least three consecutive quarters; (2) the seep does not constitute, and does not flow to, waters of the State or Waters of the United States for three consecutive quarters; (3) the seep is no longer impacted by flow from any coal ash basin as determined by the Director of DWR in accord with applicable law and best professional judgment; or (4) the seep has been otherwise eliminated (e.g., through an engineering solution). If a seep that has been dispositioned through drying up reappears in any subsequent survey, such a seep will no longer be deemed dispositioned and can be subsequently re-dispositioned as specified above. Non -constructed seeps described in paragraph 1(h) of this SOC cannot be dispositioned through option (2) above. No changes to seep status were observed during this inspection. Seeps S-37 and 5-38 were identified as a part of the 2019 inspection and will be included in future inspections. Page 2-1 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra 3.0 REFERENCES NCDEQ. (2018). Special Order by Consent EMC SOC WQ 517-009. Page 3-1 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra FIGURES 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra APPENDIX A PHOTOGRAPHS 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra 0 359°N ITI 0 35.216614°N, 81.774704°W x16.41t 1 668ft S-01 I View of dispositioned seep location facing north. Page 1 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra S-03 I View of seep location facing southeast. O 141OSE (T) ® 35.217594ON, 61.752647OW *16.4ft • 651ft �t{ {1 1 INN I L'OuLaI1104(S-04) View of NPDES Outfall 104 (5-04) facing southeast. Mumma Page 2 of 20 2019 Annual r'MW IMIJ Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra S-05 � View of dispositioned seep location facing north-northwest. Page 3 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra ® 223°SW (T) S-07 I View of SOC sample location facing southwest. (n 4 35.208508°N, 81.756218°W s16.4ft ♦ 7541t ' S-08 I View of dispositioned seep location facing north-northwest. ' Page 4 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra w S-09 I View of dispositioned seep location facing southeast. S-10 I View of dispositioned seep location facing north. Page 5 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra Decimal DM`� Latitude 35.219549 3s i:;' i 0" N Longitude -81 J56671 81 °4 s'2n' w S-11 View of dispositioned-. location ® 32°NE (T) * 35.217472°N, 81. I1NMM17%L�' �' ' S-12 I View of dispositioned seep location facing northeast. Page 6 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra 270 0329°NW . , ¢ 3,¢.2148t¢°N, 81.755798°W -;4ft ♦ 688ft N} OVA t?13 G 0 yr 0�. 3 i 5-14 View of seep location facing northwest. Page 7 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra W I NW N 111 2/0 U 1 9 ,- i .F r ® 297°NW ID S-16 I View of seep location facing west-northwest. Page 8 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra ® 76°E (T) ® 35.2172816N, 81.769218°W x16.4ft ♦ 683ft S-17 I View of dispositioned seep location facing east. ® 354°N (T) * 35.216518°N, 81.768471°W f16.4ft ♦ 667ft S-18 I View of seep location facing north. ' Page 9 of 20 2019 Annual �oril 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra S-19A I View of seep location facing northwest. 1 Page 10 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra 0218°SW Rl S-20 View of dispositioned seep location facing southwest. Photograph taken after annual seep inspection. 0318°NW tp # 35.214676°N, 81.755936°W z16.4ft ♦ 687ft IS-21 I View of seep location facing northwest. ' Page 11 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra 0165°S (T) OO 35°13.102'N, 81°44.896'W t16ft • 651ft View of dispositioned seep location facing south. Photograph taken S-22 after annual seep inspection. Approximate abandoned pipe location indicated by red arrow. * 35.2181134N, 81.750504°W z16.4ft S-23 I View of seep location facing southeast. Page 12 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra O 190°S (T) ® 35.218319°N, 81.749466°W 116.4ft ♦ 668ft tA S-24 I View of dispositioned seep location facing south. 082°E (Tq) * 35.217522°N, 81.755�224yyM�:16.4ft • 706ft S-25 I View of dispositioned seep location facing east. i Page 13 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra S 26 I_ View of dispositioned seep location facing southeast. I ® 337°NW (T) 1. 35.213703-N, 81.756317°W AZ8ft A 707ft t i r zJlli S-27 View of seep location facing north-northwest. Page 14 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra 0227°SW (T) 935.211662°N, 81.754120-W 216.4ft ♦ 7371t 1, 1AIM ; � IS-28 I View of seep location facing southwest. ' 0329°NW (T) III 35.211582-N. 81.754021°W m16.4ft ♦ 7121t - Y A r , I +ate; yr S-29 View of seep location facing northwest. Page 15 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra 0228°SWR14936.211690°N, 81.764074°W x16.4ft A746ft S-30 I View of seep location facing southwest. Page 16 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra 011 ME(T) O35.211273°N. 81.753609°W:16.4F1 ♦769ft NS-32 I View of seep location facing east-southeast. €1 S-33 I View of dispositioned seep location facing east. Page 17 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra IS-34 I View of dispositioned seep location facing southeast. ' 0 347°N M ® 35.208065°N, 81756195°W :16.4ft 1 781ft S-35 I View of dispositioned seep location facing north. Page 18 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra S-36 [S-37 I View of seep location facing northwest. ' Page 19 of 20 2019 Annual Seep Report April 2020 Rogers Energy Complex - Cliffside Steam Station - Duke Energy Carolinas, LLC SynTerra Page 20 of 20 TABLE 1 SOC LOCATIONS AND DESCRIPTIONS - 2019 INSPECTION 2019 ANNUAL SEEP REPORT ROGERS ENERGY COMPLEX - CLIFFSIDE STEAM STATION DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC Location Coordinates Receiving Receiving Facility Sample ID Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection Latitude Longitude Classification Iron oxidizing bacteria apparent on substrate near Cliffside S-OS* 35.215639 -81.775344 Broad River WS-IV Steady flow within 3 foot wide stream located NA -Seep Dispositioned NA -Seep Dispositioned the outlet of the draw. Slightly more flow than northwest of inactive Unit 5 Ash Basin. previously observed. Steady flow consistently observed within a well-defined channel. Seep drainage in wetland area via 1-2 foot wide stream channel, located north of the pH 5-10 0 .0 S. inactive Unit 5 ash basin. Drainage collects Monitoring at established Hardness 800. Cliffside S-02 35.217217 -81.768678 UT to Broad River WS-IV seep flows from S-18, S-19 and S-19A. Flows Duke Energy S-02 Mercury 1 pg/L Flow is steady and clear. Orange aerobic north to the Broad River at a point monitoring site Sulfates 50 mg/L bacteria/floc/iron-oxidation apparent on substrate. approximately 50 feet downstream of the TDS 5050 mg/L Inactive Unit 5 Ash Basin discharge outfall. Thallium 0.5 pg/L Three pipes observed from the bank. Two pipes are Minor seepage and groundwater influence from 6" terracotta and are dry. One pipe is a 10" Cliffside 5-03 35.22001 81.7577 Broad River WS-IV closed Units 1-4 ash basin area to sample point Broad River Instream NA - 2B Standards Apply corrugated steel pipe that has corroded at the base. Seepage emerges from the bank below the within former condenser circulating water Monitoring (CCW) discharge canal for retired units 1-4. pipe. Flow is steady from below the steel pipe and orange aerobic bacteria/floc/iron-oxidation is apparent on substrate. Intermittent flow within a braided stream that may Diffuse flow emerging from a small area along migrate laterally depending on scouring and Cliffside S-05* 35.218147 -81.749844 Broad River WS-IV the bank of the Broad River and base of the NA - Seep Dispositioned NA - Seep Dispositioned deposition cycles from river fluctuation. Orange active ash basin. floc/iron-oxidizing bacteria on sandy substrate. Minimal flow. Steady, clear and braided stream that flows in Monitoring at established Flow infiltrates at berm between river and stream. Cliffside S-07 35.218642 -81.745975 UT to Broad River WS-IV a relatively level area northeast of the active Duke Energy S-07 pH 5-10 S.U. Overland flow discharge to the river was not ash basin at edge of property line. Flow is monitoring site observed land or boat. Slightly more flow than north to Broad River. previous inspections. Cliffside S-08* 35.208547 -81.755781 Suck Creek WS-IV Natural conveyance tributary to Suck Creek NA - Seep Dispositioned NA - Seep Dispositioned Silty and sandy substrate with no apparent floc/iron-oxidation. Similar to previous inspections. Minor, diffuse flow to Suck Creek near Flow observed in concrete channel and on rock Cliffside 5-09* 35.217122 -81.754244 Suck Creek WS-IV confluence with Broad River. NA - Seep Dispositioned NA - Seep Dispositioned face entering Suck Creek. Orange aerobic bacteria/floc/iron-oxidation apparent on subrate. Seep was located near bank of Broad River, from past toe drains adjacent to Unit 1-4 Rip rap on bank from new construction. Braided Cliffside S-10** 35.219472 -81.756731 Broad River WS-IV Inactive Ash Basin. Following ash basin NA - Seep Dispositioned NA - Seep Dispositioned flow from 4 to 5 locations. Sandy and silty excavation and toe drain removals, seep has substrate with no apparent orange aerobic disappeared bacteria/floc/iron-oxidation. Seep was located near bank of Broad River, from past toe drains adjacent to Unit 1-4 Sandy and silty substrate with slight orange Cliffside S-11** 35.2194 -81.756617 Broad River WS-IV Inactive Ash Basin. Following ash basin NA - Seep Dispositioned NA - Seep Dispositioned aerobic bacteria/floc/iron-oxidation observed. Flow excavation and toe drain removals, seep has rate is a trickle with seepage from 3 or 4 locations disappeared below rip -rap. Diffuse seepage to area of wetness (AOW) with Water relatively clear with flow at a trickle. Orange Cliffside S-12* 35.217658 -81.751783 Broad River WS-IV no defined channel on bank of Broad River NA - Seep Dispositioned NA - Seep Dispositioned aerobic bacteria/floc/iron-oxidation apparent on below ash storage area. AOW does not reach substrate. Flow emerging from bank and flowing surface waters. toward Broad River. Page 1 of 4 TABLE 1 SOC LOCATIONS AND DESCRIPTIONS - 2019 INSPECTION 2019 ANNUAL SEEP REPORT ROGERS ENERGY COMPLEX - CLIFFSIDE STEAM STATION DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC Location Coordinates Receiving Receiving Facility Sample ID Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection Latitude Longitude Classification Minor flow was located at bank of Broad River, adjacent to Unit 1-4 Inactive Ash Basin. Flow observed on bank entering Broad River. Flow Cliffside S-13 ** 35.218353 -81.754942 Broad River WS-IV Following ash basin excavation, seep has NA - Seep Dispositioned NA - Seep Dispositioned rate at a trickle. Orange aerobic bacteria/floc/iron- disappeared. oxidation apparent on substrate. Seepage located along toe of dike (west side) Cliffside S-14 35.214511 -81.755844 Suck Creek WS-IV of the active ash basin. Area of wetness - no Suck Creek Instream NA - 2B Standards Al ppy Pooled water by sign, but no flow toward Suck flowing water observed. Any flow would move Monitoring Creek. toward Suck Creek. Second seepage area located along toe of dike (west side) of the active ash basin. Area of Suck Creek Instream Wetter than previous inspections, flow in channel Cliffside S-15 35.214297 -81.756117 Suck Creek WS-IV wetness - no flowing water observed. Any flow Monitoring NA - 2B Standards All reaches Suck Creek. could move via poorly incised channel toward Suck Creek. Third seepage area located along toe of dike (west side) of the active ash basin. Any minor Suck Creek Instream Steady flow within channel. Notable floc/iron- Cliffside S-16 35.2141 -81.756208 Suck Creek WS-IV flow could move via channelized area toward Monitoring NA - 2B Standards Apply oxidizing bacteria on substrate. Flow continues Suck Creek. toward Suck Creek. Minor seep at river edge and below the Cliffside S-17** 35.217192 -81.769272 Broad River WS-IV ordinary high water level of Broad River, west NA - Seep Dispositioned NA - Seep Dispositioned Similar to previous inspections. Flow in three (upstream of S-2). separate channels enters the Broad River. Seepage from riprap at toe of inactive Unit 5 Monitoring at 5-02 Orange aerobic bacteria/floc/Iron-oxidation Cliffside S-18 35.216439 -81.768564 UT to Broad River WS-IV Ash Basin. Flows north into wetland area See S-02 apparent on substrate. Aquatic life apparent in draining to sampling site S-2. . stream. Slightly wetter than previous inspections. Seepage from wooded area at toe of inactive Monitoring at 5-02 Orange aerobic bacteria/floc/iron-oxidation Cliffside S-19 35.216361 -81.768681 UT to Broad River WS-IV Unit 5 Ash Basin. Flows north into wetland area See S-02 apparent on substrate. More flow than previous draining to sampling site S-2. monitoring site. inspections. Seepage from wooded area at toe of inactive Monitoring at 5-02 Orange aerobic bacteria/floc/iron-oxidation Cliffside S-19A 35.216581 -81.769217 Broad River WS-IV Unit 5 Ash Basin. Flows north into wetland area See 5-02 apparent on substrate. Slightly more flow than drainingto sampling site S-2. p g monitoring site. previous inspections. Stagnant AOW at toe of northeast side of Seep not visible in area of rip -rap repair. Water Cliffside S-20** 35.215856 -81.765217 Broad River WS-IV Inactive Unit 5 Ash Basin. AOW dispositioned NA - Seep Dispositioned NA - Seep Dispositioned exists in ditch farther downgradient near the via repair, cooling tower. Seep located along dike of the active ash basin Stagnant water that follows groin of upstream dam Cliffside S-21 35.214625 -81.755953 Suck Creek WS-IV (west side). Area of wetness - no flowing Suck Creek Instream NA - 2B Standards Apply and infiltrates prior to discharge into Suck Creek. water observed. Any flow would move toward Monitoring Traces of orange aerobic bacteria/floc/iron- Suck Creek. oxidation apparent on substrate. Cliffside S-22** 35.218278 -81.748258 WS-IV Pipe has been plugged; discharge eliminated. NA - Seep Dispositioned NA - Seep Dispositioned Pipe is plugged, no discharge. Page 2 of 4 TABLE 1 SOC LOCATIONS AND DESCRIPTIONS - 2019 INSPECTION 2019 ANNUAL SEEP REPORT ROGERS ENERGY COMPLEX - CLIFFSIDE STEAM STATION DUKE ENERGY CAROLINAS, LLC, MOORESBORO, INC Location Coordinates Receiving 9 Receiving Facility Sample ID Waterbo Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection Latitude Longitude Classification Seep to pooled area adjacent to the Broad Cliffside 5-23 35.217994 -81.750208 Broad River WS-IV River, located north of the active ash basin. Broad River Instream NA - 2B Standards Apply Ponded water present at seep emergence. Visible Minor seepage from pool emerges with any Monitoring flows reaching Broad River. minor flow draining north to the Broad River. Cliffside 5-24* 35.218139 -81.749428 Broad River WS-IV Minor seepage to AOW near bank of Broad NA -Seep Dispositioned NA -Seep Dispositioned Sandy and silty substrate. Stable with low flow to River and north of active basin. the river. Minor seepage to AOW below ash storage area. Similar to previous inspections. Trickle of flow to Cliffside S-25** 35.217689 -81.751894 Broad River WS-IV No measurable flow has been observed NA - Seep Dispositioned NA - Seep Dispositioned throughout site history. Broad River. Cliffside S-26* 35.217425 -81.753931 Suck Creek WS-IV Natural conveyance near bank of Suck Creek NA - Seep Dispositioned NA - Seep Dispositioned Sandy and silty substrate with rock outcrops. Flow near confluence with the Broad River. in channel entering Suck Creek. Seep located along dike of the active ash basin Cliffside S-27 35.21383 -81.756478 Suck Creek WS-IV (west side). Area of wetness - no flowing Suck Creek Instream NA - 2B Standards Apply No flow or wetness observed. water observed. Any flow would move toward Monitoring Suck Creek. Minor diffuse groundwater seepage along steep Suck Creek Instream Wetter than previous inspections. Orange aerobic Cliffside S-28 35.211677 -81,753876 Suck Creek WS-IV bank of Suck Creek, west of the active ash Monitoring NA - 2B Standards Apply bacteria/floc/iron-oxidation apparent on substrate. basin dike. Minor diffuse groundwater seepage along steep Suck Creek Instream Flow is low and clear. Orange aerobic Cliffside S-29 35.211542 -81.753993 Suck Creek WS-IV bank of Suck Creek, west of the active ash NA - 2B Standards Apply bacteria/floc/iron-oxidation apparent on substrate. basin dike. Monitoring Similar to previous inspections. Minor diffuse groundwater seepage along steep Suck Creek Instream Flow discharges across several areas toward Suck Cliffside S-30 35.211496 -81.75391 Suck Creek WS-IV bank of Suck Creek, west of the active ash NA - 2B Standards Apply basin dike. Monitoring Creek over rocks and as drip faces along the bank. Flow is trickling/dripping and clear. Orange aerobic Minor diffuse groundwater seepage along steep Suck Creek Instream bacteria/floc/iron-oxidation apparent on substrate. Cliffside S-31 35.211482 -81.753887 Suck Creek WS-IV bank of Suck Creek, west of the active ash Monitoring NA - 2B Standards Apply Area is approximately 20 feet wide along bank and basin dike. water trickles toward Suck Creek at several locations. Minor diffuse groundwater seepage along steep Flow is a trickle and clear. Orange aerobic Cliffside 5-32 35.211258 -81.753646 Suck Creek WS-IV bank of Suck Creek, west of the active ash Suck Creek Instream NA - 26 Standards Apply bacteria/floc/iron-oxidation apparent on substrate. basin dike. Monitoring Area of diffuse flow approximately 30 feet wide flowing toward Suck Creek. Seep was located at bank of Broad River, adjacent to Unit 1-4 Inactive Ash Basin. Soft sediment at bank. Abandoned outfall gone. No Cliffside S-33** 35.218272 -81.754754 Broad River WS-IV Following ash basin excavation, seep has NA - Seep Dispositioned NA - Seep Dispositioned flow. New outfall constructed for wastewater disappeared. treatment plant. Sandy and silty substrate with rock outcrops. Flow Cliffside S-34* 35.217556 -81.753725 Suck Creek WS-IV Natural conveyance near bank of Suck Creek NA - Seep Dispositioned NA - Seep Dispositioned infiltrates prior to entering Suck Creek. No apparent iron -oxidizing bacteria observed. Page 3 of 4 TABLE 1 SOC LOCATIONS AND DESCRIPTIONS - 2019 INSPECTION 2019 ANNUAL SEEP REPORT ROGERS ENERGY COMPLEX - CLIFFSIDE STEAM STATION DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC Location Coordinates Receiving Receiving Facility Sample ID Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection Latitude Longitude Classification Flow less than previously observed and infiltrates Cliffside S-35* 35.208203 -81.755703 Suck Creek WS-IV Natural conveyance near bank of Suck Creek NA - Seep Dispositioned NA - Seep Dispositioned prior to entering tributary. Sandy and silty with minor amounts of iron -oxidizing bacteria observed at the confluence of the tributary. Minor diffuse groundwater seepage along bank Cliffside S-36 35.210258 -81.753983 Suck Creek WS-IV of Suck Creek, west of the active ash basin Suck Creek Instream NA - 26 Standards Apply Steady trickle flow from three drip faces. dike. New area identified with no current data. Monitoring Area to be monitored to determined status. Seeps Discovered During 2019 Inspection Seep located approximately 20 feet Cliffside S-37 35.210266 -81.753827 Suck Creek WS-IV downstream of S-36. Flow emerges 25 feet from Suck Creek as standing water which Suck Creek Instream NA - 2B Standards Apply Flow minor and diffuse. Notable iron staining and becomes shallow, flowing, and somewhat Monitoring floc present. Insufficient volume to sample. diffuse as it flows toward Suck Creek. Seep emerges near the ordinary high water mark of the Broad River north of the active ash Broad River Instream Flow is low and not apparent when river levels are Cliffside S-38 35.217759 -81.752742 Broad River WS-IV basin. Flow is low and travels through multiple 9 p Monitoring NA - 2B Standards Apply PP y high. Iron staining 9 g present on sandy substrate. channels in sandy shoreline substrate toward Insufficient volume to sample. the Broad River. NPDES locations Seepage from bank downgradient of active ash Steady flow consistently within a well-defined rip - Cliffside Outfall 104 35.217641 -81.752596 Broad River WS-IV basin to a channel flowing toward the Broad NA - Monitored per terms NA - 2B Standards Apply rap channel. Silty and clayey sand beneath rip -rap. (5-04) River. of the NPDES permit Orange aerobic bactera/floc/iron oxidizing bacteria apparent on rip -rap substrate along channel. Steady stream with moderate flow volume Steady moderate flow. Water is clear. Seepage Outf-)all within well-defined channel at toe drain for NA -Monitored per terms observed at toe of the dam at/near the rip -rap pile. Cliffside (506 35.21844 -81.748266 Broad River WS-IV active ash basin dam, downstream of former of the NPDES permit p NA - 2B Standards Apply Vegetation conceals some flow. Orange aerobic AOW S-22 and bacterial/floc/iron-oxidation apparent on substrate near the confluence with the Broad River. along channel, especially apparent in eddies. Notes: * - Location previously investigated as a seep. Monitoring has not indicated the presence of coal combustion residuals. ** - Seep dispositioned via repair and/or non -flowing condition to potentially reach Waters of the U. S., or other, as noted. Monitoring shall be conducted at the approximate locations indicated on the attached site map. All monitoring shall be conducted per the requirements found in Attachment B of this Order. pg/L - micrograms per liter 2B - 15A NCAC 02L .0202 Standard mg/L - milligrams per liter NA - Not Applicable NPDES - National Pollutant Discharge Elimination System S.U. - Standard Units SOC - Special Order by Consent TDS - Total Dissolved Solids UT - Unnamed Tributary Prepared by: KDF Checked by: GTC Revised by: T]G Checked by: SAS Page 4 of 4