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Home My WebLink AboutNC0003425_SOC WQ S18-005_20200511 (., DUKE James Wells C ENERGY® Vice President Environmental, Health and Safety Programs&Environmental Sciences 526 South Church Street Charlotte, NC 28202 (980)373-9646 May 7, 2020 Via Overnight Mail S. Daniel Smith Director of Water Resources North Carolina Department of Environmental Quality 1617 Mail Service Center RECEIVEDJNCDEQIQWR Raleigh,NC 27699-1617 MAY l i 2U20 Bob Sledge North Carolina Department of Environmental Quality Non-Discharge Division of Water Resources Permitting Unit Water Quality Permitting Program 1617 Mail Service Center Raleigh,NC 27699-1617 Subject: Report Under Special Order by Consent—EMC SOC WQ S 18-005 Duke Energy Progress, LLC—Roxboro Steam Electric Plant NPDES Permit NC0003425 Final Seep Report Dear Messrs. Smith and Sledge: On behalf of Duke Energy Progress, LLC (DEP), I am submitting to you the Roxboro Steam Electric Plant Final Seep Report summarizing the findings of the comprehensive survey completed following completion of decanting as required by Special Order by Consent(SOC), SOC No. S18- 005 Section 2.c.4). Completion of decanting occurred at Roxboro on February 11, 2020. 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. Smith and Sledge May 7, 2020 Page 2 Please direct any questions concerning the Roxboro Steam Electric Plant SOC No. S 18-005 to Lori Tollie at(336) 854-4916 and to Chris Hallman at(980) 373-7892 regarding this Final Seep Report. Sincerely, James Wells Vice President, Environment, Health& Safety- Programs and Environmental Sciences Duke Energy Attachment: Roxboro Steam Electric Plant May 2020 Final Seep Report CC: Richard Baker, Duke Energy Lori Tollie, Duke Energy Chris Hall man, Duke Energy Shannon Langley, Duke Energy Robert Howard, Duke Energy Paul Draovitch, Duke Energy Matt Hanchey, Duke Energy synTerra 2020 FINAL SEEP REPORT ROXBORO STEAM ELECTRIC PLANT EMC SOC WQ S18-005 1700 DUNNAWAY ROAD SEMORA, NC 27343 MAY 2020 PREPARED FOR <CIS DUKE ENERGY PROGRESS DUKE ENERGY PROGRESS, LLC K e ing Project ientist Cr ' ady, NC LG 1 99 Senior Project Manager 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra TABLE OF CONTENTS SECTION PAG E 1.0 INTRODUCTION 1-1 1.1 Inspection Details 1-2 2.0 FINDINGS 2-1 2.1 General Observations 2-1 2.2 Effects of Decanting 2-1 2.3 Changes to Seep Status 2-2 3.0 REFERENCES 3-1 LIST OF FIGURES Figure 1 Seep Locations and Inspection Areas LIST OF TABLES Table 1 Seep Locations and Descriptions—March 2020 Inspection LIST OF APPENDICES Appendix A Photographs pP Page 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra LIST OF ACRONYMS DWR North Carolina Division of Water Resources EAB East Ash Basin EMC Environmental Management Commission NPDES National Pollutant Discharge Elimination System SOC Special Order by Consent WAB West Ash Basin Page ii 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra 1.0 INTRODUCTION On March 18, 2020, Craig Eady (NC L.G. #1599) of SynTerra inspected the Roxboro Steam Electric Plant(Roxboro or Site) property for existing and potential new seeps. Inspection activities were performed in accordance with North Carolina Environmental Management Commission (EMC) Special Order by Consent(SOC) WQ #S18-005. The Special Order by Consent describes inspection requirements as follows: No later than 90 days following the completion of decanting at each Facility, and in the same manner as in the annual surveys, Duke Energy shall conduct a comprehensive survey of areas down gradient of ash basins identifying 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 this survey, including a section analyzing the effect decanting of the basins(s) has had on seep flows, accompanied by copies of the photographs noted above, shall be submitted to the Director of DWR ("Final Seep Report"). This Final Seep Report must list any seep that has been dispositioned (as described in subparagraph (3) above)during decanting process, including an analysis of the manner of disposition. The determination of whether a seep is dispositioned rests with the Director of DWR. At, or at any time prior to, submission of the Final Seep Report, Duke Energy shall seek formal certification from the Director of DWR, certifying the disposition of any seep that Duke Energy has characterized as dispositioned. Any seeps not certified as dispositioned by the Director of DWR shall not be deemed as dispositioned. All locations listed in Table 1 of the SOC were observed and documented with photographs during the inspection. General inspection observations include: • No previously unidentified seeps were observed during the inspection. • No notable changes to seep status were observed during this inspection. • Passive decanting (removal) of free water from the West Ash Basin (WAB) was initiated on April 10, 2019 with the redirection of wastewater inflows from the WAB to the lined retention basin treatment system. Page 1-1 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra 1.1 Inspection Details The weather was clear before and during the inspection. Temperatures ranged from approximately 51 to 60 degrees Fahrenheit (F). No precipitation was recorded on the day of the inspection or three days before the inspection, according to the on-Site weather station. Five days prior to the inspection, on March 13, 2020, a 0.07-inch rain event was documented. The inspector reviewed previous seep inspection reports and the weekly dam safety inspection reports for each ash basin.Jake Muessen (Duke Energy System Owner) conducted the ash basin dam safety inspections and prepared the reports. Before the inspections, Mr.Jake Muessen and Mr. Eric Cleaver (Roxboro CCP Implementation Manager) were interviewed about recent rainfall, construction/stabilization projects associated with the ash basins, and general Site conditions in and around the ash basins. Observations from the dam safety inspection reports were consistent with observations made during the post-decanting inspection. The inspection included observations in the following areas (Figure 1): • WAB main dam and chimney drains • Areas northeast of the WAB main dam • Southern half of the WAB sluice lines access area • The effluent discharge canal from the WAB extension impoundment to the heated water discharge pond • The East Ash Basin (EAB) main dam • Areas proximate to the EAB main dam to the southwest and northeast; eastern side of the EAB/industrial landfill • Effluent discharge canal from the EAB extension impoundment area to the east side of the gypsum storage area • Area between the south side of the industrial landfill and unnamed tributary • Southwestern and eastern sides of the industrial landfill (south of the EAB extension impoundment area) • Areas identified as downgradient of 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 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra 2.0 FINDINGS 2.1 General Observations Inspection observations of each seep are described in Table 1. A summary of the details includes: • No new seeps were observed during the inspection. • No previously unidentified or unreported pipes were observed during inspection. • Flow conditions at seeps were normal and generally consistent with previous inspections. • Water levels in the heated water discharge pond, the unit 3 cooling tower pond, and the cooling water intake canal appeared consistent with normal levels. • Water levels in the WAB/EAB effluent discharge canals and the basin impoundments were noted at slightly lower levels. 2.2 Effects of Decanting Passive decanting of free water from the WAB began on April 10, 2019 through the cessation of wastewater inflows to the WAB. By April 10, 2019, all wastewater inflows to the WAB were ceased with the redirection of Plant wastewater to the lined retention basin treatment system. No decanting is expected or anticipated for the EAB. Duke Energy provided a Notification of Decanting Completion letter to the North Carolina Department of Environmental Quality (NCDEQ) Division of Water Resources (DWR) on February 11, 2020. The notification indicated water levels within the WAB have equalized across the north and south sides of the internal filter dike (Figure 1) at approximately 447 feet elevation. Based on elevation changes of approximately 13 feet across the filter dike, the WAB has been lowered by 90 million gallons of wastewater through the gravity drainage process. Due to the design of the ash basin, this amount of water is the most that can be removed without water allowed to flow back into the ash basin through the filter dike. No mechanical removal of water (active decanting) will occur as indicated in the SOC and prior to National Pollutant Discharge Elimination System (NPDES) permit receipt. The annual seep inspection occurred approximately a year after wastewater inflow to the WAB had ceased. There were no noticeable effects to seep flow related to passive decanting from the WAB during the inspection. Page 2-1 • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra 2.3 Changes to Seep Status Mr. Eady 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 the inspection. Page 2-2 • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra 3.0 REFERENCES Duke Energy Progress, LLC. (February 11, 2020). Interim Date Compliance Submittal, Notification of Decanting Completion Letter, Roxboro Steam Electric Plant. North Carolina Department of Environmental Quality. (2018). Special Order by Consent EMC SOC WQ S18-005. Page 3-1 • • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra FIGURE •' ( ¢ ,�. -,�.. .-.-.�.. /• • , rr • a 1 - iw lNTA' L� CAN 1 'r STORA + UNIT 3 COOLING _Y~ s 21I ' - TOWER POND r ,,:.,...',', — ' EATEO WATER -- __.. - *2 ELECTRICAL 2' :_ x CHARGE POND. 1 .. • AL g • =Y { -- SUBSTATION d f @ l � i S 1 I` c . 2 3 .• S-2 S10 S 1 EAST ASH _ SEPARATO BA (S-5 IS-201 8 S-11 /{S-9 y. IS-6 �S 1 . ..., S 7 --nS 19 . w S8 `• `.�.`+,,` - FGD ' _ LEGEND PONDS t �, `. �- '�+,' ; NPDES CONSTRUCTED SEEP (APPROXIMATE) ........ NON—CONSTRUCTED SEEP (APPROXIMATE) '-, , WEST ASH ? rc �,/ .�' DISPOSITIONED SEEP(APPROXIMATE) ' BASIN ASH BASIN WASTE BOUNDARY r — DUKE ENERGY PROGRESS PRO PERTY LINE - .�/ —EFFLUENT DISCHARGE CANAL s :g~ •�.:m. 'y"—•-_"_ '`- : `.�• �� }�! ��„„,��. e < � ...,...J< ... r.7' .: li, 4t. ,. � ---„ � � •��. � > STREAM (AMEC NRTR) � ` SPECIAL ORDER BY CONSENT(SOC) - +* +�� ".. ( q �INSPECTIONAREA J .M.. .. „ + ) h NOTES: Jr d ..,. . FILTER DIKE 1 C t 1.SPECIAL ORDER BY CONSENT(SOC)LOCATIONS ARE DESCRIBED IN EMC SOC WQ S18-005. !� .- ♦_.a. `' / �+., d "- 2.NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM(NPDES)LOCATIONS ARE r • . ' y"""•:` , DESCRIBED IN PERMIT NC00034245. ' `•'—- ,' '. " . "• .tea ` `M ,- - - 4.PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY PROGRESS,LLC. . _ y R<.. 5.SEEP LOCATIONS WERE DERIVED FROM VARIOUS SOURCES AND AREA MIX OF SURVEYED +. n^ r' ,,, `r •.ram♦ AND APPROXIMATE LOCATIONS.THEREFORE,SEEP LOCATIONS ARE TO BE DEEMED „� • • APPROXIMATE. + ✓ � 6.THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY CORPS :! OF ENGINEERS AT THE TIME OF MAP CREATION.THIS MAP IS A PRELIMINARY '. -+ JURISDICTIONAL DETERMINATION ONLY.THE PRELIMINARY WETLANDS AND STREAMS �"'r' °'•'" ,,, a , BOUNDARIES WERE OBTAINED FROM AMEC FOSTER WHEELER ENVIRONMENTAL& +, ,- ^"}, „',„:, °., ', 1 ,... INFRASTRUCTURE,INC.NATURAL RESOURCES TECHNICAL REPORT(NRTR)FOR ROXBORO J I y oeR - J STEAM ELECTRIC PLANT GATED DUNE 2015. jM� ♦ . :_ ` , .., ar",° J AERIAL WAS COLLECTED ON JUNE ,2018. OGLE EARTH PRO ON OCTOBER 017. + _, / L � ' 7.AERIAL PHOTOGRAPHY OBTAINEDFROM .• 8 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE .r "� ,�-r'� -♦ µ ,,_-* , ,.,. - _... - COORDINATE SYSTEM FIPS 3200(NAD83).C rr' ;=r M -Ir I s' - GRAPHIC SCALE -V a. $ . I/`•' 4.5DUKE ass o e75 1.,350 FIGURE 1 .:.�.1 `, ENERGY �`.. ..1' s$ (IN FEET) PROGRESS SEEP LOCATIONS AND INSPECTION AREAS *•♦t w+`'� DRAWN BY:I.KIRTZ DATE:O5 /03/2019 2020 FINAL SEEP REPORT ` ` t REVISED BY:J.KIRTZ DATE:04/21/2020 ♦ - - . ' �� CHECKED BY:K.LAWING DATE:04/21/2020 ROXBORO STEAM ELECTRIC PLANT +'J I ) APPPRORECT NAGR CI EADY NG DATE:04/21/202G SEMORA, NORTH CAROLINA synTerra �,'" www.s nterracor..com TABLE 1 SEEP LOCATIONS AND DESCRIPTIONS - MARCH 2020 INSPECTION 2020 FINAL SEEP REPORT ROXBORO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, SEMORA, NC Location Coordinates ReceivingReceiving Facility Sample IDWaterbody Description*** SOC Monitoring Interim Action Notes from Inspection Latitude Longitude Waterbody Classification Levels Heated Water NA - Seep Roxboro S-01 36.477043 79.076467 Discharge Pond NA - Not a Classified Chimney drain discharge from West Ash Basin dam to Heated contribution analyzed NA - Not a Classified Very low, clear flow. Biofilm and orange floc present with algae growth flowing to NPDES Surface Water Water Discharge Pond in NPDES Permit Surface Water on concrete substrate. permit outfall 003 monitoring Heated Water NA Seep Very low, clear flow. Biofilm and orange floc present with algae growth Roxboro S 02 36.477055 -79.076727 Discharge Pond NA - Not a Classified Chimney drain discharge from West Ash Basin dam to Heated contribution analyzed NA- Not a Classified on concrete substrate. No flow from 1" PVC pipe due to sediment flowing to NPDES Surface Water Water Discharge Pond in NPDES Permit Surface Water blocking intake. permit outfall 003 monitoring Heated Water NA - Seep Roxboro S-03 36.476994 79.076978 Discharge Pond NA - Not a Classified Chimney drain discharge from West Ash Basin dam to Heated contribution analyzed NA - Not a Classified Low, clear flow. Minimal biofilm, orange floc present with algae growth flowing to NPDES Surface Water Water Discharge Pond in NPDES Permit Surface Water on concrete substrate. permit outfall 003 monitoring Heated Water NA - Seep Roxboro S-04 36.476923 79.077204 Discharge Pond NA - Not a Classified Chimney drain discharge from West Ash Basin dam to Heated contribution analyzed NA - Not a Classified Low, clear flow with no biofilm. Orange floc present with algae growth on flowing to NPDES Surface Water Water Discharge Pond in NPDES Permit Surface Water concrete substrate. permit outfall 003 monitoring Heated Water NA - Seep Roxboro S-05 36.476751 79.077412 Discharge Pond NA - Not a Classified Chimney drain discharge from West Ash Basin dam to Heated contribution analyzed NA - Not a Classified No flow or dry conditions. Small pool of water in concrete channel near flowing to NPDES Surface Water Water Discharge Pond in NPDES Permit Surface Water toe of dam. permit outfall 003 monitoring Heated Water NA - Seep Roxboro S-06 36.47669 79.077643 Discharge Pond NA - Not a Classified Chimney drain discharge from West Ash Basin dam to Heated contribution analyzed NA- Not a Classified Very low flow to stagnant conditions in pooled areas. No orange floc or flowing to NPDES Surface Water Water Discharge Pond in NPDES Permit Surface Water biofilm. Some green algae growth on concrete substrate. permit outfall 003 monitoring Heated Water NA - Seep Roxboro S-07 36.476736 79.077954 Discharge Pond NA - Not a Classified Chimney drain discharge from West Ash Basin dam to Heated contribution analyzed NA- Not a Classified Very low flow. Minimal biofilm, orange floc present with algae growth on flowing to NPDES Surface Water Water Discharge Pond in NPDES Permit Surface Water concrete substrate. permit outfall 003 monitoring Heated Water NA - Seep Discharge Pond NA - Not a Classified Seepage area approximately 30 feet west of chimney drain #7. contribution analyzed NA - Not a Classified Broad wet areas that collect, forming a small channel at confluence with Roxboro S-08 36.476719 -79.078064 flowing to NPDES Surface Water Drainage/flow is to the Heated Water Discharge Pond. in NPDES Permit Surface Water heated water discharge pond. Very low flow at confluence. Biofilm and permit outfall 003 monitoring orange floc/algae at confluence. NA - Seep See page 6 of Roxboro S-09 36.47823 -79.056076 UT to Hyco Reservoir WS-V; B Discharge from extension of East Ash Basin. contribution analyzed attachment A of Abundant reed vegetation and higher water level within thein NPDES Permit Roxboro SOC S18- impoundment creating marshy/boggy soil conditions and algae growth. monitoring 005 document. Extension of East Ash NA Not a Classified Minimal AOW with no flow located on northern portion of East Ditch that directs stormwater flow during heavy or sustained Roxboro S-10** 36.479169 -79.056963 Ash Basin berm. Flow would drain to extension of East Ash NA Seep NA Seep precipitation events. No flow. No biofilm, orange floc, or algae. Rock Basin Surface Water dispositioned dispositioned Basin. substrate with moist soil in ditch. ** Extension of East Ash NA - Not a Classified Minimal AOW with no flow located on central portion of East NA - Seep NA - Seep A vegetated grassy area. Dry conditions. No saturated soil, channeling Roxboro S-11 36.478569 -79.056737 Basin Surface Water Ash Basin berm. Flow would drain to extension of East Ash dispositioned dispositioned or reed/Phragmites vegetation. Basin. Extension of East Ash NA Not a Classified Minimal AOW with no flow located on southern portion of East Roxboro S-12** 36.478103 -79.056735 Ash Basin berm. Flow would drain to extension of East Ash NA Seep NA Seep A vegetated area. Dry during inspection. No saturated soil or channeling. Basin Surface Water dispositioned dispositioned Basin. Page 1 of 2 TABLE 1 SEEP LOCATIONS AND DESCRIPTIONS - MARCH 2020 INSPECTION 2020 FINAL SEEP REPORT ROXBORO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, SEMORA, NC I Location Coordinates Receivin Receiving Interim Action Facility Sample ID Waterbody Waterbody Description*** SOC Monitoring Levels Notes from Inspection Latitude Longitude Classification Not a seep. Outfall of culvert channeling flow from UT on east See page 6 of See page 6 of Roxboro S-13** 36.486175 -79.059612 Hyco Reservoir Intake WS-V; B side of facility that receives flow from East Ash Basin extension attachment A of attachment A of Strong, steady flow from both culverts. Water was clear. Canal (Hyco Reservoir) Roxboro SOC S18- Roxboro SOC S18- and S-21. Flows to facility water intake canal (Hyco Reservoir). 005 document. 005 document. Unit 3 cooling tower Location is the end of the 24" pipe draining a boggy area south pond to the Heated of the gypsum storage area. Pipe extends under the pad NA - Seep Moderate flow from corrugated pipe. Significant reed and vegetation Roxboro S 14 36.483738 -79.063751 Water Discharge NA - Not a Classified towards the northwest, under railroad tracks, with discharge to contribution analyzed NA- Not a Classified growth around culvert and ditch. Very little orange floc absent of biofilm. Canal flowing to Surface Water a ditch that drains to the Heated Water Discharge Pond. This in NPDES Permit Surface Water Slight odor(sulfur/sour egg smell) in area. NPDES permit outfall non-constructed seep flows to a portion of an NPDES monitoring 003 wastewater treatment system. Quarterly monitoring Small stream flowing Seepage from wet area north of West Ash Basin along sluice at point prior to Hardness 1200 mg/L NA - Not a Classified Low, clear flow adequate for sample collection. Slight biofilm, orange floc Roxboro S-18 36.477947 -79.073728 to Heated Water line corridor. Flows west in small stream to the Heated Water flowing into Heated TDS 1600 mg/L Discharge Pond Surface Water Discharge Pond. Water Discharge Sulfates 1000 mg/L and algae on muddy substrate. Pond. Heated Water AOW with minimal flow located adjacent to the S-01 chimney NA Seep Discharge Pond NA - Not a Classified contribution analyzed NA- Not a Classified Roxboro S-19 36.477176 -79.0763902 flowing to NPDES Surface Water drain at the east end of the West Ash Basin dam. Any flow in NPDES Permit Surface Water Dry conditions. Grassy vegetation. No flow or saturated soil observed. permit outfall 003 moves toward the Heated Water Discharge Pond. monitoring Quarterly monitoring Insufficient flow to sample below the S-20 seep including the smaller, Small stream flowing NA Not a Classified Seep flow to small stream channel northeast of West Ash Basin at point prior to Hardness 1200 mg/L secondary channel emerging from the northeast. Sufficient flow for Roxboro S-20 36.47799 -79.0749 to Heated Water dam. Drains west through wetland to Heated Water Discharge flowing into Heated TDS 1600 mg/L sampling in small channel near the heated water discharge pond. Flow is Discharge Pond Surface Water Pond. No sample data due to lack of flow. Water Discharge Sulfates 1000 mg/L low and clear. Slightly muddy substrate with minimal leaf debris. Minimal Pond. orange floc/algae growth. Monitoring of UT to Seep emerging downgradient of storm water basin below East Hardness 1000 mg/L Hyco Reservoir at Small drainage channel from a storm water collection basin. Very low WS-V; B Ash Basin. Flow drains adjacent to East Ash Basin effluent TDS 1000 mg/L Roxboro S-21 36.48246 -79.0559 UT to Hyco Reservoir established Duke flow to stagnant conditions. Abundant leaf litter within channel. (Hyco Reservoir) channel from point of emergence to UT to Hyco Reservoir Energy S-13 Sulfates 1000 mg/L Significant biofilm and algae present with some orange floc. intake canal. monitoring location. Copper 5 pg/L Located just east of the cooling tower ponds. Wetness emerges Flow emerges from a rise with multiple power poles east of the cooling Heated Water NA - Seep tower pond. Very wet soil conditions and Phragmites. Flow crosses from several points on the hill side area. Minimal flow could Discharge Pond NA - Not a Classified contribution analyzed NA- Not a Classified pavement as light sheet flow and under pavement, daylighting on the Roxboro S-22 36.48184 -79.0657 eventually reach Outfall 003. No sample data to date due to flowing to NPDES Surface Water in NPDES Permit Surface Water west side with low flow along side of pavement within a small channel. permit outfall 003 lack of flow. This non constructed seep flows to a portion of an monitoring Flow is muddy on a gravel substrate. No algae or floc on west side. NPDES wastewater treatment system. Significant algae, biofilm on the east side of and on the roadway. Located on sloped area along the southwest end of the East Area is on west side of main dam adjacent to concrete storm water Heated Water Ash Basin dam. Saturated soil conditions with little to no flow. NA - Seep channel. Very saturated soil conditions. No channeling or flow. Roxboro S 23 36.48035 -79.0685 Discharge Pond NA - Not a Classified Diffuse flow is directed to channel with discharge to Heated contribution analyzed NA- Not a Classified Significant algae growth on soil/grass substrate. Wet conditions persist flowing to NPDES Surface Water Water Discharge Pond and Outfall 003. No sample data to date in NPDES Permit Surface Water from end of storm water concrete channel/rip rap downgradient to rip permit outfall 003 due to lack of flow. This non-constructed seep flows to a monitoring rap at perimeter of Unit 3 hot water pond. portion of an NPDES wastewater treatment system. Prepared by:KTL Checked by: CDE 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. ***-Some descriptions have been updated from the original text found in the SOC Attachment A table for accuracy and currency. pg/L-micrograms per liter mg/L-milligrams per liter NA-Not Applicable NPDES-National Pollutant Discharge Elimination System PVC-polyvinyl chloride SOC-Special Order by Consent UT-Unnamed Tributary TDS-Total Dissolved Solids Page 2 of 2 • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra APPENDIX A PHOTOGRAPHS • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra 1 120 150 180 210 I I • I • i • I . 1 • I • I • I • I • i I • I • I . 0166°S (T) (i 36°28'37"N, 79°4'35"W ±16ft A 412ft , Iwo- -.,, �- , . ,..?° , ...?......711$1,..'-',_ --: .., . !liNglr .1 -F"Z -, " ?` �. ria " ��+'". aid,I/ 7,24:41P;41 " . '',. ,,,,,_,..,-!'„,, 7 Aioter''",..gr.,i7,406*-**. i. . " :" '" .. •--' ' �'- `32. �...4 'II: 1 `Y 1`' �' + � = - .ice, • • p' , , , A 18 Mar 2020, 10:12:48 S-01 View of constructed seep location looking south. Page 1 of 20 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra E SE 90 120 150 180 I I I • I • I I • I i i I I I • ' w... o o � �� o � .:� 141 SE (T) * 36 28 37 N, 79 4 36n W +16ft ♦ 407ft ..ter • a _ � .. i•.�'`tom+...• �," .r-.7"` S-02 / • • 18 Mai,2020,'•10;15.•57 S-02 View of constructed seep location looking southeast. Page 2 of 20 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra E SE ,S 90 120 150 180 210 • I • 1 . 1 • 1 • I • I • I • I • I . 1 r 1 r 1 ' I • I 0143°SE (T) (1) 36°28'37"N, 79°4'36"W ±16ft A 413ft ��, ►� •.'��(•,�,• ." ,�,k . ram:. n' � ,�^ . • e. j p�rY .y".• Ekt. may, . >. /' .. c.' d ' t q 1 - - ! M i - •'yam 4 t _ - - \ r y, 18 Mar2020 :10:22:28. S-03 View of constructed seep location looking southeast. Page 3 of 20 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra SE SS 120 150 180 ---..--` 210 I • I • I • I • I • I • I • l • I • I • I • I • I • I • 0 170°S (T) Q 36°28'37"N, 79°4'37"W ±16ft ♦ 450ft r �.` ,gip }.0„ , - • `;": -'4.AIL * _ S;fi ;. y # v ',7 Iii 2 1. ' A 0 . . i , , . , , . 1"1614411Sio p4 , '.-"t . . . ... . . *No„,,,,,, .4 , ... . .,.... . , . . .. ,_ ,. .. , • ., . . ..,,, ... . ..., -..).14 . . ... . , , .., .,..., . 1 . . „ ., . .•. ..' ,. ;:,.:,'.. , . .: . 8 - S-04 View of constructed seep location looking south. Page 4 of 20 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra k. S E S SW 0 120 180 210 I • I • I • I • I • I • I • I • I I I I • ! I 0 161°S (T) O 36°28'36"N, 79°4'38"W +16ft ♦ 425ft r M x �m /e `� ;. ;. - -t • y.,._ .. c yr a a V. � •�.� •?''' '' vma �1 • ,, - 18; ,.a a20, 0. S-05 View of constructed seep location looking south. Page 5 of 20 • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra E SE S S 90 120 150 180 210 I • I • I • I • I • I • I • I . I • I • I • I • I • I . 0159°S (T) r 1 36°28'35"'N, 79°4'39"W ±16ft ♦ 387ft I �... t 40 `-1 f I ' A; .fit. 7. 0) a r 1!i , Wit k : ;'' 2 M f elii • j „4 ,. A • ~ �m ?�. . r . •'i' , $ 0 1:10:22 S-06 View of constructed seep location looking south. Page 6 of 20 • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra E SE S 90 120 150 180 210 • i • I • I • I • I • 1 • I • I • I • I • I • I • 1 . 1 0144°SE (T) G 36°28135"N, 79°4'40"W ±16ft A 430ft a ;, *w„.,w "w P i.;;-.k""-s.:y`y '�:`�, .:..,y :+*+Ao-'�.-9'r'Ij'. ,- x 4,0. f .Lye,'*'G, x„au,,tea • . f. tie ,,,A41.4 . .. ; ' S-07 l • S-07 View of constructed seep location looking southeast. Page 7 of 20 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra NW N NE 300 330 0 30 60 0 5°N (T) * 36°28'36"N, 79°4'41"W ±32ft ♦ 401ft zi (. �r��'! 1 i ..1 i S-08 View of non-constructed seep location looking north. • Page 8 of 20 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra NE E SE 30 60 90 120 1:—d 0 79°E (T) O 36°28'41"N, 79°3'22"W ±16ft ♦ 449ft ., , ,, „ ,. , ., ,..,,,,i• l' # of 4'i:',,, '' $ Ai . t i t 1 i 1 *, ti ilit I ; tl:' t*'; ( 13'0. i 3 ,i'S° IV /1 ti f '3 t ' pi (41 1 � 114ll ; it( .1 't14,41 9 k, r r Ilf‘ i,11414,1 414 ,1, 4 4 ,k,:.'f' ,t'i 11, :1,, P , *,,` ,'i. " l'',,,, \..;c �r4 14 tit, i {,,ai, { M t r, tti, w ' rj/V' `) r ii ii u1 t;` �1i1. 1 , ,` � I '.' 1'¢ s�• r y7t1 , i' l' , t�. 4 il� at �., i , i' I; tlt : �" Alt r ', r P i' l' '' i t( t . 1,1 \ l' I` 1'. i. -,\ ,k i ' ' '' tliii ' ' , ., ,, I 11 V ' ; .1, , I ,,44 t ' r 1. 1 4:: 1:-,' il,Pii/ , l '1 .4 +'� ' .1, 1 ',4. ' ;i',, , 'ii '* • ' rl. • ' 4 H.11111'si ' t ;.' ; ;1 i ' rf' ': !'`1 , ., 1 'a 1t I fI � . t ,f ii ,, 'il, 'n, f i , ! i i .> . i, s 10) ' { "1 i ( 'i / k l ;11 \, • 1 . LP tk f !.. i , , ' , 1 t I e 1 ' ' '' ' . ,. ,� „' •:°, ar 2020, 14:01 S-09 View looking east at constructed seep area with high vegetation. Page 9 of 20 • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra N NE E 330 0 30 6t 90 I • I • I ' I • I I • l • I • I . 1 ' 1 • 1 • I u 0 33a NE (T) ( � 36o 28 44 N, 790 3 24"W ±16ft ♦ 476ft 7 d I f A.O.W. ` ''a { `' „ S-14 �, ff i; � y�' ,� M Y Y l' • ' VTR i ./� ,`� Z,v ., 1 i , .. .^ t ' 7 „„ S-1O View of dispositioned seep location looking northeast. Page 10 of 20 • • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra NE E SE 60 90 120 150 • I • I • I • 1 • I • I • I • I • I • I • 1 • I • I • 0 106°E (T) 0 36°28'42"N, 79°3'24"W ±32ft ♦ 443ft 4• • r.... t$ lr v' ,0420. '.M e7 y a fi 9 j P :S A {y aY n".,I ♦r '' dN d t ' Y yf MW b� l� • 1,•, ' , _ ¢• tt � ^� 1 ar, Q201i18,.53:2 S-11 View of dispositioned seep location looking east. Page 11 of 20 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra N NE 0 60 90 120 . I • 1 • I • 1 • I • 1 • I • I • 1 • I • I • ( • I • I • 0 66°NE (T) * 36°28'41"N, 79°3'25"W ±32ft ♦ 462ft t � q,O.W• .»a 18 Mar 2020, 13:58:4 S-12 View of dispositioned seep location looking east. Page 12 of 20 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra N NE E 330 301 60 90 0 33°NE (T) 36°29'10"N, 79°3'34"W ±16ft ♦ 412ft MEM -imm _ ,. ' I MO IMO B ;°t. 1 A 1_ +.tr+k 1 OMR «ramI OM o OM _� le y 1M \tr * I MOW. -...-.- -_;m s .•• "' 1_..�- 111111111 ......01011111rog 111110011, 0r ..� ,.�...M•► WOO 0 ....... IOW ajaut IM_----r----- is 01A....111.•00 5-13 View of the dispositioned seep location looking down from protective scaffoldin•.Concrete culvert discharging to the north into the intake canal. Page 13 of 20 • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra N NI E 0 30 60 90 1 I • I • I • I • I • I • 1 • I • I • I • 1 • I • I • I • . 0 47°NE (T) C 36°29'1"N, 79°3'49"W ±16ft ♦ 416ft , , ; FriiPP r, �,I 1 :.,. ,P k a« " pis � , 1 , ', ':‘ 4. ' ' '' , ," , \r , ,r, ,r, ,ir '2k ' I., ,,,i ri, 1 1 : ,, . . l'', sr A '.1.s ,.k.,'',,,,,,.\.i . ` �'.‘ 1 1, d a, • /' 1 _ ". siN,, , .N,21 ,.,1), i �� • , •, \?! , ., ....„,,,* . :‘, 11.1i.., ,. — Nkkt4\.‘.k .- ,, •• _ ,, „, , ./.. c •__1......_._._._.__:_... At\.,,li, 11, , ,, ,,, /, /,.; „zi I. ; ,,,, \ i , , I 0 '� W 141/4 \ , Ili t,i,*1 I-11/4:: ,1 ',„i- ,,r, ,,.tlim'i,,,v, ,i.,;:,,,,i,i , _,,fi . ,\ , � �� ail );' 't r �1)k ' 4 �� k4 r . , ,k"."'L•ii=4,47//k. t\IN. f I' ''' ' ' 2 I 1!0‘ . , , . . ., 4,,, � � , . .... ,„, �,,".., ice' 1f .. ' —` ;18 Mar 2020, 13:2 .33 • S-14 View of non-constructed seep location looking northeast. Page 14 of 20 • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra NW N NE 330 0 30 60 • I • I • I • I • I . ! • I • I • ( • I • ( . I • I , 1 C) 15°N (T) CD 36°28'39"N, 79°4`25"W ±16ft A 524ft Ali -, „5,, yip. .„, _ .. s 1.',-1 ....., � a �j rti �� ^ , d f W 1 a M M 1 a ...x -Y , (\ 1 • +° •to •. � n ar r—+ �,,,,` x` - ,`y+ r ,rs +fir . �• ` *�fi; .' .'4 �'# M1 ~1•;*fy- t' . . re. titm35•,�� ..4*- MM -. . ; !* ,, : , . ` , ; .G2020 09:28; 0444.7 S-18 View of non-constructed seep location looking north. Page 15 of 20 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra W NW N 240 270 3C 330 0 ' I • t • I' • I • I • I • I • I • I • I • I • I • I " I 302°NW (T) a 36°28'37"N, 79°4'35"W ±16ft ♦ 424ft sr.µ 18 rMMi3t 2020, 10:05.4 S-19 View of non-constructed seep location looking northwest. Page 16 of 20 • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra NE E SE 60 90 ii 120 150 18 I • I • 1 . 1 • 1 • 1 • 1 • I • I • I • I • I • I • I • 1 0 110°E (T) {11 36°28'40"N, 79°4'30"W ±32ft ♦ 417ft tom . . , a ,� s . : , :,-,,,,,,..—n 1, . .,....:11: .4. :,,,,„4 ,' i ,-, '-'," .:` .:''','-. - _. ,_-_.,-„,.....,.-.'-L.... ,,,.._c...:.-,.......„,:„.......•..:c...,,..i.,.„....,'-...,i.A;..„.,,.„,,`,..-.-„.,-,-,_,_.,I.::4,:,„..,,..'„.,t-'1-,,. x q+ l•:.'„.,.;...,',,„!,,„ti;,„:I4-„;..t.,91 f., , 71 qyf (gp, . 4 ,1,I.... _ /.._ . ,_ ._:. .. :,...„ .. „ , •_„„.,,. „_„.....%.. , ,,_: I:4, __, ....,,, .00.1t.,,„ >.. ..... _.. . , •,..„_.3. .., ,,,..., ,....,..„ ... it : _.;:. • ,,,.,,„..., 4 „„rt'.,- ....,...x.:!,,,,,,,,4 44,,,,,,,., „.,. . Nqklita "�k - It-# , +fit 4" ' ~ �..•. .. � � '.i� J ^� fir. • MM, ar.. a { "" •+., •c�, .,wry. r.4„,.., ov �` ..�iu � t _ Q 1- w, .' !� [fir , t. ,7 i t,0 a . . 13�, # .• . ,.4` r, `. w ,' , ''''''''' .-.: i3 ^'^.''40,44,0 Ys `t, * ' oe,,-*". , 4 , 4 ,j, . " i wr_d .y.` AP` N • +w. �11 r S-20 View of the non-constructed seep location looking east. Page 17 of 20 • 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra NW N NE 300 330 0 30 6i • I . 1 • I • 1 • 1 • 1 • I • I • I • I • I • I . • I • I 0 351°N (T) O 36°28'56"N, 79°3'20"W ±16ft ♦ 475ft • ,,r e: S [f td -7 h ..,,..,1,,ft y: ... .., ,.. „...,•,-..,„ ...7"..-. d y, fir ."'♦ �� ." ;#:. 4- O. A.O.W. . ',. ... .. S- 1 " , v • .. .4.„: . ,......„, . T: ..,,,, a . r , r why i .. ac•+�*, .#fir 4, � +4 '0i 1.-* 'S .0. ;_. b fir. w }gyp "*, '(" x .- 4. ,''� ,:;^ewe.: 4 a" j'k „ �. y v jlt ! a it l !d , *.kipp. 4 p Mai. ry'•; � , ",fir'. '' + .. '.w ra,4% 4, '8 M.a r Q ' . , , .. .�.1..., 1, „ 1`1:17 , S-21 View of non-constructed seep location looking north. Page 18 of 20 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra 150 180 210 • 1 • ' • I • I • j • I • I • I • I • I • I • I . 0166°S (T) 36°28'54' N, 79°3'57` W ±16ft A 399ft 3 w , '` .' ' "it ' 't R < a ' i s 'j' iiHii A air'... -a .',. f r. „:1, .r , '' ' ' ' 4 , ,-. - . .', w v ,,,..,.„,...„,,, J Vik*.ti/t*ki'' :04'......4,4),,,,..,°, 4174%,,,,,k;,,,,,isl•kfl,:,.3.:tt:,,,..;.w....,,,itt...,<,..,,...,,,,t,,,',..r.,„4:...,,,f ' ' ' 4*' ' ''"iekft 1, ...,,, „.. 12., ;,, -.t.,. ,,!::11., 1 ,:ift4 � �li�.r� {fix`»°a�'. 1 kx i. ` ;.: .\ ( "1 s N f 1 , . . ,-wi.„. •Gift'S z r(_ i.k co ' , ,a .i �18))Mar 2g2QA 12:tba:.. View of non-constructed seep location looking southeast. Page 19 of 20 ' 2020 Final Seep Report May 2020 Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra NW N NE 330 0 30 60 9• I • I • I • l • I • I • I • l • I • I • I • I • I • I • I 0 21°N (T) E.) 36°28'49"N, 79°4'6"W ±16ft ♦ 462ft 3 MI fa w. 3gy . Imo y,� r h Y"C{(' .�£ .+Awn y _ 1 4 . 18 Mar 2020, 13:09:07 S-23 View of non-constructed seep location looking northeast. Page 20 of 20