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Home My WebLink AboutNC0000396_SOC WQ S17-010_20200424 (2) �' DUKE James Wells RECEIVED Vice President ENERGY. Environmental,Health and Safety Programs&Environmental Sciences MAY 01 2020 526 South Church Street • Charlotte,NC 28202 (980)373-9646 NCDEQ/DWR/NPDES April 24, 2020 Via Overnight Mail S. Daniel Smith Director of Water Resources North Carolina Department of Environmental Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Bob Sledge North Carolina Department of Environmental Quality Water Quality Permitting Program Division of Water Resources 1617 Mail Service Center Raleigh, NC 27699-1617 Subject: Report Under Special Order by Consent —EMC SOC WQ S I7-010 Duke Energy Progress, LLC —Asheville Steam Electric Plant NPDES Permit NC0000396 Interim Seep Report Dear Messrs. Smith and Sledge: On behalf of Duke Energy Progress, LLC (DEP), I am submitting to you the Asheville Steam Electric Plant Interim Seep Report summarizing the findings of the comprehensive survey completed in early 2020 as required by the Asheville Steam Electric Plant NPDES Permit NC0000396 Special Order by Consent (SOC), SOC No. S 17-010 Section 2.b.1). 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 April 24, 2020 Page 2 Please direct any questions concerning the Asheville Steam Electric Plant NPDES Permit NC0000396 SoC No. S 17-010 to Robert Wylie at (704) 382-4669 and to Chris Hallman at (980) 373-7892 relative to the Interim Seep Report. Sincerely, James ells Vice P sident, Environment, Health & Safety- Programs and Environmental Sciences Duke Energy Attachment: Asheville Steam Electric Plant Interim Seep Report cc: Richard Baker, Duke Energy Robert Wylie, Duke Energy Chris Hallman, Duke Energy Teresa Williams, Duke Energy Tina Woodward, Duke Energy Paul Draovitch, Duke Energy Matt Hanchey, Duke Energy synTerra 2020 INTERIM SEEP REPORT ASHEVILLE STEAM ELECTRIC PLANT EMC SOC WQ S17-010 46 DUKE ENERGY LANE ARDEN, NC 28704 APRIL 2020 PREPARED FOR efek, DUKE ENERGY, PRO RFS' DUKE ENERGY PROGRESS, LLC Grant Barrier Pro* ct Manager Todd ating, LG 2410 Project Manager • 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant- Duke Energy Progress, 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 2-2 3.0 REFERENCES 3-1 LIST OF FIGURES Figure 1 Seep Locations and Inspection Areas LISTOF TABL ES Table 1 Seep Locations and Descriptions—March 2020 Inspection LIST OF APPENDICES Appendix A Photographs Page i • 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra LIST OF ACRONYMS EMC Environmental Management Commission NPDES National Pollution Discharged Elimination System SOC Special Order by Consent Page ii 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra 1.0 INTRODUCTION Coal fired generation of power ceased at the Asheville Steam Electric Plant (Asheville or Site) in January 2020. On March 30, 2020, Todd Plating (NC L.G. #2410) of SynTerra inspected the 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 #S17-010. That SOC describes inspection requirements after termination of coal fired power generation at the Site as follows: Within ninety days after the Asheville coal fired generation ceases, and no later than April 30, 2020, Duke Energy shall conduct a comprehensive survey of areas downgradient of the 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 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 ("Interim Seep Report"), shall be submitted to the Director of DWR no later than April 30, 2020. This Interim Seep Report must list any seep that has been dispositioned (as described below) since the Special Order became effective, including an analysis of the manner of disposition. All locations listed in Table 1 of the SOC, with the exception of previously dispositioned seep P-01, were observed and documented with photographs during the inspection. P-01 was not accessible during the inspection due to new fencing and highway projects in the area. General observations include: • No previously unidentified seeps were observed during the inspection. • Ongoing dewatering of the 1964 ash basin has produced several notable changes to seep status during this inspection. 1.1 Inspection Details The weather was clear before and during the inspection. Temperature was approximately 60 degrees Fahrenheit (F). Prior to the inspection, the most recent rainfall event occurred on March 25, 2020. A total of 1.37 inches was recorded at the on-Site weather station. No rainfall was recorded on the day of the inspection or in the four days before the inspection. Page 1-1 • 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra The inspector reviewed previous seep inspection reports. Observations from previous inspection reports were consistent with observations made during the March 2020 SOC inspection. The inspection included observations in the following areas (Figure 1): • Along the toe of the 1964 ash basin dam • Along the toe of the former 1982 ash basin dam • Along the divider dike between the two ash basins • Areas along and downgradient of the 1964 ash basin and former 1982 ash basin • In the French Broad River floodplain 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 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra 2.0 FINDINGS 2.1 General Observations Inspection observations of each seep are shown in Table 1. Details include: • No new seeps were observed during the inspection. • No previously unidentified or unreported pipes were observed during inspection. • A 90-degree V-notch weir was installed at the headwall of the 1964 basin seep collection system for 64E0-01 and 64E0-02; therefore, this flow is no longer being contained and pumped back to the 1964 basin. Flow now discharges out NPDES permitted Outfa11101. Flow above the lowest point of the weir (Outfall 101) was recorded at 0.20 feet (approximately 21 gallons per minute) at time of inspection. • Flow was observed emanating from the base of the stormwater dissipation structure north of the former 1982 ash basin weirs. • No flow from the pipes within the weirs at the former 1982 ash basin was observed. Flow from dissipation structures was at a sufficient volume to back up into the weir boxes. • DD-Pipe was observed flowing overland into an adjacent parking lot storm drain, which conveys water to the west stormwater basin. The discharge from the west stormwater basin is ultimately monitored at F-01. • The Interstate 26 (I-26) widening project is changing Site conditions adjacent to M-01, A-01, A-02, and B-01. • Most wet weather ditches appeared dry and were not holding water. 2.2 Effects of Decanting Dewatering of the 1982 ash basin is complete. Seep K-02 was dispositioned because of non-flowing conditions as a result of dewatering the former 1982 ash basin, as noted in the SOC. Page 2-1 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra • Dewatering of the 1964 ash basin is underway at a rate of approximately 240,000 gallons per day. Ongoing dewatering of the 1964 ash basin has produced several notable changes to seep status since the previous inspection: • The saturated area around C-03 appeared to be reduced in size relative to previous inspections, and the area of seepage has migrated approximately 15 feet downslope. • C-05 was dry. • 64E0-03 was dry. 2.3 Changes to Seep Status Mr. Plating 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. Seeps C-05 and 64E0-03 were observed to be dry during the March 2020 inspection, likely due to ongoing dewatering of the 1964 ash basin. If conditions persist, those seeps could meet the requirements for dispositioning. No other changes to seep status were observed during this inspection. Page 2-2 • 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra 3.0 REFERENCES North Carolina Department of Environmental Quality. (2018). Special Order by Consent EMC SOC WQ S17-010. Page 3-1 • 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra FIGURES ...�._ t s • - a '`:'fly..1 5 '1 + L' - - ;C / r . ,t i• Sit �s% ` i, LAKE JUUIW f` ti B *�' • 1 d n ' Teu a, } ..- * ' It 1 -. �C JI . r� 4. 1 . +..- ` 'PONDED ASH BASIN � ' .WA, aver . LEGEND t C-2. /64E0-1/2 I, NPDES CONSTRUCTED SEEP(APPROXIMATE) r t • CONSTRUCTED SEEP(APPROXIMATE) ss _ • NON-CONSTRUCTED SEEP(APPROXIMATE) DO PIPE......„. $ 4FORMER 1984 ) • DISPOSITIONED SEEP(APPROXIMATE —D —'' ' _ ' ' " : 1964 ASH BASIN WASTE BOUNDARY c, — FORMER 1982 ASH BASIN WASTE BOUNDARY -° --' --' - —.DUKE ENERGY PROGRESS PROPERTY LINE p iIRM SPECIAL ORDER BY CONSENT(SOC)INSPECTION AREA ° c `-" - F %Y � t„, ^• �� !� -�—STREAM(TVVf 2016) WETLAND(TWT 2016) �.,, „ »r ._, ` � SURFACE WATER FLOW DIRECTION <`" 82E0 "2 /y 'ilk. . . .' NOTES: c ,. • • r•• 1 SPECIAL ORDER BY CONSENT(SOC)LOCATIONS ARE DESCRIBED IN EMC SOC _ ''�/ ` a �.♦ �e WOS17-010. r •• s£y�E£k( 3'°° �♦ * 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM(NPDES)LOCATIONS _ ♦ �' e°c ". ARE DESCRIBED IN PERMIT NC0000396. • s 3 THE STREAMS AND WETLANDS JURISDICTIONAL DETERMINATION WAS _; K ?✓ , - - ' PERFORMED BY TAYLOR WISEMAN AND TAYLOR(TWT)AND ASSIGNED USAGE • �"• ' #SAW-2 01 4-001 89.THESE WETLANDS AND STREAMS WERE APPROVED BY THE US �/ �+• I ARMY CORPS OF ENGINEERS(USACE)ON MAY 1 016 ( `. I 6,2 ,• r .•' a•`` " .i.,s 4.ALL BOUNDARIES ARE APPROXIMATE. y` • r y Mr �g :, _ _ -L yam, `‘ '• +`A 5.PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY PROGRESS,LLC. ` ' ., 2 `" r/ f� . 6.AERIAL PHOTOGRAPHY OBTAINED FROM NORTH CAROLINA ONE MAP ON a , `:, -8 FEBRUARY 20,2020.AERIAL DATED JANUARY 1,2019. ° r •• + i. �9 7.DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE • •� . 1 1t•- ` P PLANE COORDINATE SYSTEM FIPS 3200(NAD83). .. t �d .> �. _.y.N .- •� � DUKE 300 0 300 600,. GRAPHIC SCALE IN FEET FIGURE 1 bm, r .�, eta', ENERGY SEEP LOCATIONS AND INSPECTION AREAS st L I + Q - _ . PROGRESS DRAWN BY:C.DAVIS DATE:03/24/2020 :W .-, 2020 INTERIM SEEP REPORT it - ^ Fsi �� REVISED BY:A.ROBINSON DATE:04/14/2020 9 CHECKED BY:G.BARRIER DATE:04/16/2020 ASHEVILLE STEAM ELECTRIC PLANT 7S - APPROVED BY:G.BARRIER DATE:04/16/2020 A R D E N, NORTH CAROLINA �pl._ _ s /ri 1er{�� PROJECT MANAGER:G.BARRIER .7�/ r 1 1 U Wnyw. nterracor..com TABLE 1 SEEP LOCATIONS AND DESCRIPTIONS - MARCH 2020 INSPECTION 2020 INTERIM SEEP REPORT ASHEVILLE STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ARDEN, NC Location Coordinates Receiving Receiving Facility Sample ID Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection Latitude Longitude Classification Easternmost of two engineered drain pipes from 1964 Ash Basin. Became permitted outfall during NPDES permit renewal. Combined NA - Monitoring Water exits from a caged pipe. Flow was observed discharging from UT to French seep flow from 64E0-01, 64E0-02, and 64E0-03 is currently being Established per Asheville 64E0-01 35.468319 -82.549104 Broad River B monitored by containment system with 90° V-notch weir. Discharge Terms of NPDES See C-01. containment system V-notch weir. Flow was measured at 0.2 feet above lowest point of weir at time of inspection. flows into UT, through culvert under I-26, into wetland area draining Permit to C-01. Westernmost of two engineered drain pipes from 1964 Ash Basin. Became permitted outfall during NPDES permit renewal. Combined NA - Monitoring Water exits from a caged pipe. Flow was observed discharging from Asheville 64E0-02 35.468319 -82.549104 UT to French B seep flow from 64E0 O1, 64E0 02, and 64EO 03 is currently being Established per See C-01. containment system V-notch weir. Flow was measured at 0.2 feet Broad River monitored by containment system with 90° V-notch weir. Discharge Terms of NPDES flows into UT, through culvert under I-26, into wetland area draining Permit above lowest point of weir at time of inspection. to C-01. Engineered drain from 1964 Ash Basin at black corrugated culvert. Flow infiltrates downstream into 64E0-01 and 64E0-02 containment NA Monitoring UT to French system. Became permitted outfall during NPDES permit renewal. Established per Asheville 64E0-03 35.466943 -82.548502 B Combined seep flow from 64E0-01, 64E0-02, and 64E0-03 is See C-01. No flow. Corrugated pipe to convey flow was dry. Broad River currently being monitored by containment system with 90° V-notch Terms of NPDES weir. Discharge flows into UT, through culvert under I-26, into Permit wetland area draining to C-01. Wetlands drainingMonitoring at Drainage ditch for collection of seeps and runoff. Water runs under pH 5-10 S.U. Point of drainage to French Broad River from wetland/braided flow location A-01 prior the gravel road via culvert toward the French Broad River. Flow Asheville A-01 35.471253 -82.552914 to French B west of I-26. Northernmost sample locations near river. to entering French Mercury 50 ng/L similar to previous inspections. Flow re-enters ground prior to Broad River Broad River Selenium 10 pg/L discharge to French Broad River. Wetlands draining Minor seep in wet area just upstream of A-01. Channeled flow drains Monitoring at Low area that is completely overgrown with vegetation. Saturated Asheville A-02 35.471155 -82.552596 to French Broad B toward A O1 location. location A O1 See A-01 with visible iron staining, but no observable flow. Similar to previous River inspections. Wetlands draining Monitoring at Mercury 50 ng/L In a ditch that runs parallel to the gravel road, right before the water Asheville B-01 35.468595 -82.551418 to French Broad B Point of drainage to French Broad River from wetland/braided flow location B O1 prior Chlorides 600 mg/L flows into a culvert that runs under the road toward the French Broad west of I-26. and south of A-01. to entering French River Broad River TDS 2100 mg/L River. Flow less than previous inspections. Monitoring at This seep is located at the end of the gravel road in the floodplain Molybdenum 300 mg/L UT to French Point of drainage to French Broad River from wetland/braided flow location C-01 prior area, adjacent to the wooden footbridge. This area receives water Asheville C O1 35.466042 -82.549701 Broad River B west of I-26 and south of B-01. to entering French TDS 1500 mg/L from D-01 and from a culvert that runs under I-26 from C-02. Flow Nickel 50 pg/L Broad River similar to previous inspections. Located downstream of the concrete structure at the toe of the 1964 Monitoring location of UT below 1964 Ash Basin for effects of ash basin dike before entering a culvert under I-26. This location is UT to French general area seepage; site is located just east of culvert under I-26. Monitoring at now receiving combined flow from 64E0-1, 2, &3 as per updated Asheville C-02 35.466891 -82.548651 Broad River B Stream flow is conveyed into wetland area draining toward C-01 location C-01 See C-01 NPDES permit. Flow is more channelized with less algae. Wetlands location. area very saturated and flowing into C-02. Wetlands area appears to have greater volume of standing water than previous inspections. Seep near base of northwest side of 1964 Ash Basin. Any flow NA- Monitoring Seep initially collected at Located at the northwest side of the 1964 ash basin between the UT to French drains to 64E0-3, the 1964 engineered outfall collection system. Established per engineered outfall and gravel access road and the dike. Seepage noted in toe of slope Asheville C-03 35.469383 -82.549293 Broad River B This non constructed seepflows to aportion of an NPDES Terms of NPDES behind rip rap approximately 10 yards upslope from sign. Seepage pumped back into basin; contained in rip rap lined drainage and conveyed to 64E0-01 and wastewater treatment system. Permit afterward, see C-01. 64E0-02. No change since previous inspection. Page 1 of 3 TABLE 1 SEEP LOCATIONS AND DESCRIPTIONS - MARCH 2020 INSPECTION 2020 INTERIM SEEP REPORT ASHEVILLE STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ARDEN, NC Location Coordinates Receiving Receiving Facility Sample ID Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection Latitude Longitude Classification AOW near base of northwest side of 1964 Ash Basin. Any flow drains NA - Monitoring Seep initially collected at Located on the north end of the downstream slope of the 1964 ash UT to French to 64E0-3, the 1964 engineered outfall collection system. This non- Established per engineered outfall and basin dam, between C-03 and 64E0-3. Area near C-05 was dry. Asheville C-05 35.46887 -82.54915 B Broad River constructed seep flows to a portion of an NPDES wastewater Terms of NPDES pumped back into basin; Minimal water observed in drainage downslope of C-05 sign. Water treatment system. Permit afterward, see C-01. within rip rap conveyance from C-03 location. Wetlands draining Located at the end of the gravel road in the floodplain area, near the Seep to established channel within wetlands west of I-26. Monitoring at wooden footbridge. This stream is in a deeply incised ditch and is a Asheville D O1 35.465061 -8254944 to French B Channel flows to C-01 location. location C-01 See C 01 tributary to the channel that contains C-01. Substantial iron staining Broad River visible. Wetlands drainingPoint of drainage to French Broad Monitoring at Located in the floodplain area, about 350 feet down the path south of g pH 5-10 S.U. Asheville E-01 35.465061 -82.54944 to French B River from wetland/braided flow west location E O1 prior Nickel 60 pg/L the footbridge and about 40 feet from the French Broad River. Broad River of I 26 and south of C O1 drainage. to entering French TDS 600 mg/L Channelized flow through low lying area. No standing water Broad River observed. Monitoring at pH 5-10 S.U. Wetlands draining Point of drainage to French Broad location F O1 prior Copper 15 pg/L Located in the floodplain area, about 950 feet south of the footbridge Asheville F-01 35.463581 -82.54854 to French B River from wetland/braided flow west Mercury 50 ng/L and about 40 feet from the French Broad River. Flow similar to Broad River of I-26 and south of E-U1 drainage. to entering French Nickel 100 g Broad River pg/L previous inspections. TDS 1000 mg/L Located in the floodplain area, about 1400 feet south of the Wetlands draining Point of drainage to French Broad footbridge near the right-of-way that crosses the floodplain area. An Asheville F-02 35.462533 -82.547499 to French B River from wetland braided flow west Monitoring at wetland/braided F-02 pH 5-10 S.U. area of ponded water ("impounded wetland") drains into a channel Broad River of I-26 and south of F-01 drainage. near the AOW sign and flows through the right-of-way toward the French Broad River. Minimal flow noted exiting the ponded area. Wetlands draining Monitoring location within wetland area west of I-26, at outlet of Located about 200 feet northeast of F-02. Flow spreads into wetlands Asheville F-03 35.463114 -82.547177 to French B culvert under I-26. May be remnant beaver pond. Flows toward F-01 Monitoring at See F-01 area immediately downgradient from culvert. Flow similar to previous Broad River location, then to French Broad River. location F 01 inspections. UT to wetlands Monitoring location of UT below the 1982 Ash Basin dam,just east Located in the ditch adjacent to I 26, east side, and downgradient of Asheville K-01 35.463051 -82.545751 drainage to B of culvert under I 26, conveying flow to wetlands west of I 26. Monitoring at See F-01 AOW 82E0-1 &2. Flow is clear with similar volume to previous French Broad Flows drain through wetlands past locations location F-01 River F-03 and F-01 before entering French Broad River. inspections. Wetlands draining Seep emerging southeast of 1982 basin dam. Any flow would drain NA Seep Asheville K-02** 35.463581 -82.544577 to French B through wetlands to sampling location F-01 before entering French NA - Seep Dispositioned Evidence of former flow and/or runoff flow. Area is completely dry. Broad River Broad River. Dispositioned Located in the ditch adjacent to I-26, east side, about 500 feet Wetlands draining Monitoring location for coalescence of seep flows prior to entering farther northwest on I-26. Construction along I-26 directly adjacent Asheville M-01 35.464266 -82.546712 to French B culvert under I-26. Flow drains throw h wetlands to lin Monitoring at sam See F-01 to M-01. Ditch to south appears g p g location F-01 to have been excavated. Check Broad River location F-01 before entering French Broad River. dams and other BMPs installed north along I-26 adjacent to M-01. Flow appears similar to previous inspections. UT to Powell Monitoring of UT Cadmium 5 pg/L Located in the low area in the woods east of the gravel road that Asheville N-01 35.474088 -82.551532 C Seep to small channel upstream of its confluence with Powell Creek. prior to confluence leads to Powell Creek and SD-01. Monitoring of UT prior to confluence Creek with Powell Creek Mercury 50 ng/L with Powell Creek. No changes since previous inspection. Monitoring site of small drainage channel south of 1982 ash basin * UT to the French NA - Seep Natural stream cut with sandy and cobble substrate. Could not access Asheville P-01 35.46185 -82.544625 Broad River B prior to entering culvert beneath I- 26. Dispositioned NA - Seep Dispositioned p O1 duringinspection due to new fencingand highway From sampling- No CCR impacts. p P 9 y projects. Page 2 of 3 TABLE 1 SEEP LOCATIONS AND DESCRIPTIONS - MARCH 2020 INSPECTION 2020 INTERIM SEEP REPORT ASHEVILLE STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ARDEN, NC Location Coordinates Receiving Receiving Facility Sample ID Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection Latitude Longitude Classification Located in the floodplain area, between B-01 and A-01, on the west Wetlands draining Monitoring at Asheville Ponded Water F 35.467232 -82.550521 to French B Ponded water near dry channel between locations B-01 and C-01 locations B-01 and See B-01 and C-01 side of the gravel road. Monitoring at locations B O1 and C O1. Water present in depression similar to previous inspections. Broad River C O1 I-26 road construction upstream with substantial clearing noted. HDPE pipe that outfalls onto riprap and drains to Powell Creek. Flow Storm Drain location at north end of site near Powell Creek. From NA - Seep present from corrugated pipe, similar to previous inspections. New Asheville SD O1 35.474121 -82.552079 Powell Creek C sampling- No CCR impacts. Dispositioned NA Seep Dispositioned stormwater BMPs installed upslope since last inspection, near laydown area. UT to wetlands Located in a concrete box outfall structure at the toe of the 1982 ash Western drain (Drain 1) from 1982 ash basin. Basin has been Asheville 82E0-01 35.464058 -82.544848 drainage to g excavated and repurposed. Any flow would drain to K-01 and F-01 Monitoring at See F-01 basin dike. No flow observed from the pipe. Flow observed emanating French Broad locations. location F-01 from the base of the stormwater dissipation structure north of the River 1982 ash basin weirs. UT to wetlands Located in a concrete box outfall structure at the toe of the 1982 ash Eastern drain (Drain 2) from 1982 ash basin; east weir. Basin has Asheville 82E0-02 35.464058 -82.544848 drainage to g been excavated and repurposed. Any flow would drain to K-01 and Monitoring at See F-01 basin dike. No flow observed from the pipe. Flow observed emanating French Broad F O1 locations. location F-01 from the base of the stormwater dissipation structure north of the River 1982 ash basin weirs. UT to wetlands French drain below divider dike between '64 and past '82 basin. Water flows from 4" PVC pipe located at divider dike. Toe of slope Asheville DD-Pipe 35.466724 -82.544403 drainage to B Flow is into former 1982 basin footprint which was recently removed Monitoring at See F-01 saturated with standing water. Seepage drains into parking lot and French Broad from the NPDES permit. Flow would drain toward M-01 location and location F-01 stormwater drain just east of seep location. River then to sample point at F-01. Prepared by: GAB Checked by:TDP 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. UT-Unnamed Tributary ig/L-micrograms per liter 28- 15A NCAC 02L.0202 Standard CCR-Coal Combustion Residuals mg/L-milligrams per liter NA-Not Applicable ng/L-nanograms per liter NPDES-National Pollutant Discharge Elimination System S.U. -Standard Units SOC-Special Order by Consent TDS-Total Dissolved Solids Page 3 of 3 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra APPENDIX A PHOTOGRAPHS 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress, LLC SynTerra r°N,17 m • 35°28'1"N,82°32.54"W±16.4ft ♦ '31" • • s It , ,: •• •, �. .0- ,.:, A, Ashevek2020 30C 30 Marl? 11:2• 64E0-01 View of the NPDES permitted seep location(facing northeast)looking down. 0 56°NE(T) *35°28'1"N,82°32'54"W*16.4ft ♦2054ft '� �*'�`�, .mow 1,.' '•:•� -'• �� .f Abt 1 .y ",;. t • • 64-E02 Asheville 2020 SOC datermark-See Settings , •• 30 Mar 2020.11.31:1 64E0-02 View of the NPDES permitted seep location(facing northeast) looking down. Page 1 of 13 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress, LLC SynTerra 0214 • ?S'28'6"N,82°32'56"W±16.4ft ♦2088ft , Y f,, .-- ,,.a.4... `f,L � iff -N , d c,'r: ,i _ _; 64E0-03 View of NPDES permitted seep location facing southwest. € • 10 W 2_98 4ft ♦2124ft d. �A ° ' y, ` , 4* "? ate + r 4 u'r � �." 1. \ A �' .tea - „4,,.- .r—• •V `#� i__ � r.N....k. _,-(..., ,.- _...-.. ..........-c , `r -- r r'!. ~ a f�+ .... . rya,..: 'e � •c term• -See. C • ' f a"1 A-01 View of SOC sample'location facing east. Page 2 of 13 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra ' • ?'16"N,82°33'9"W t16.4ft ♦2036ft ,n r y t i..... t '4 i- t .,N LQ1 <\-01 View of seep location facing east. • a 1" ' ' 'of -,i..1.-- ,.'io t'te : e.4-4,4' e .- mil` .��. '. r. y sue.** 1: P" .y .s0 ,. 4 , , '1 F 44F A ;; } A • . e ' .k#,r-R 1T.' j 1, �.► 4. ' {^ Se „ . y 'a +far. '�;„ ...r B-01 View of SOC sample location facing northeast. , -.. Page 3 of 13 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra 0 165°S(T) • 35°27'57"N,82°32'58"W t16.4ft ♦2005ft tie itt..„ . , ,eF....„.„ 4 *, a ,. :►" ramA .� e .T • .- yc 1 Jy • F„ - _�. "> °.w` { -, : * --:-,..... .• .7. . - r'. iik ' ti '. ti ..,. . , • . , , @r . 4 , . ... .. . . y OX t ,, .. . C-01 View of SOC sample location facing south. n 0176°S(T) • 35°28'0"N,82°32'54"W±,_ ,, ,__.___. 1,,..:, x �� •a, ' z q ` 1 j• . „,A ♦ Y .. r4' I 4 . C-02 View of seep location facing south. Page 4 of 13 I 2020 Interim SeepReport P April 2020 Asheville Steam Electric Plant-Duke Energy Progress, LLC SynTerra 0 29°NE (T) • 35°28'9"N,82°32'57"W±16.4ft A 2119ft T M 11110, t. , 0,� w, , Y vi" - Y T r y ' r . pr y . ,. r ; 1 a r4( 1. If `T I C-03 View of NPDES permitted seep location facing northeast. s 762A,c2.1.1_6ft_ 1 \„..... ::,......., - ' Y a ...,.,. .,,,,,i,.....m,L,:104.0.4.wilf: :i...,•,, .-,. 1'.- P' a. +-'' a f ."a 1 1P; ' l' o �..„. Y"W `'- .'v L ''pis , 0 C-05 View of NPDES permitted seep location facing northeast. Page 5 of 13 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra f4 ' -� w` ...-,may" 'Y } ri. r , j.3K P` r 44e- U-01 View of seep location facing northeast. O 134°SE(T) Z 35°27'54"N,82°32'57"W±16.4ft ♦2027ft s +t om ,' � -. J g j r Y el'`41, • f +y y ,u_ *^ .�} , ` § Ashevi e 2020_S0 ark �rG o 1" �1� t r y>Mar 2b20 15:05:4 } E-QZ View of SOC sample location facing southeast. , f Page 6 of 13 - 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra 0 252°W(T) •,35°27'48"N,82°32.54"W*32.8ft •2027ft ,i, 110, :t +t .f �' A ix,,r: ase i < KK IT{'Ad.%e rx A, . w�Arliw 6 #$1. *' • kw ,,,,, f ,L 0. Your'watermark-See Settings ' ' View of SOC sample location,facing west.SOC sign in F-01 rack round. • 35°2745"N,82°32.51'W± .' a,* ft • w � . I -of- / ♦ 4 .. .,..fie i !i 3 >• Ark w � •", yy4ll.1,,A Nf ♦ 1. .' •L..,. kit0t,,4".*1 , r; , 1 tek n,, .3:-,,4 ' 4 '' ; — i�r .=. p' �I�t OF.. Al. F-0/ View of SOC sample location facing east. Page 7 of 13 - 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra :119°N(T) ;• 35°27'46"N,82°32`48"W±16.4ft ♦2039ft i . i , A . . „ 1 Asheville 2020 SOC r'_iiy _ 30 Mar 2020,15:28:06 I~-O 3 View of seep location facing north. .� c:: • , , .. ♦2049ft 4,F- 1 t a ... 'y*. rt,�w: a y fi y , ,s• ti ,.it .,:i.,.. -,,-- ,,„-.A -,,- -,, "�r _ .. • . 1.• " ' " x a g: i .r. 1- ,'. ,Atte, - 0,1 ,iar -a3► ir2'''' K-01 \ of seep location facing northeast. Page 8 of 13 • 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra O 103°E(T) t$35°27.48"N,82°32'40"W±16.4ft •2051ft , tk,o w _ . f r ds - FT .•'. .. d\i 'dam Jtar#;,,,.;. ,,, r m,.y� P ', L'b' 1 . .4.+,4 • a View of dispositioned 00 ed seeplocation facing east. K 02 p • +y r Nt. ,. . - ,, _ �a 4�• + 1 ,illit Xi ,,,,.. 17,}�0. f 1 v\.,' i s,"tif '44 b ` � � S4 a'11t ( 4 " 014''''''' . 7; ''''', ,‘ r ,,„, .t ..„„.. v. r ,§7,s Z. . Olk,...'.310:'4,If*! 47 i . . AOit i•o 1. „ol zliragi x fi ' 'Q''' ArkVIA ,, , u .,a < I� �'id M—01 \ i('.v of seep location facing ea,t. Page 9 of 13 • 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra 0 37°NE(T) • 35°28'26"N,82°33'5"W±16.4ft ♦2042ft • i .rA 4" e• 5.r-r rt R, • -tM i n ° r j •��,. ,c. s' 4 , r .;.- ifig *i' .: 54,E 1• r,* A: ` .ts -F a, Apk4040 } a , 5i-,1:144L9 N-0 1 View of SOC sample location facing northeast. S • r 210 , �� • 1 • 1 • 1 • 1 • I • I <.._1 ' 1 • 1 • 1 • 1 • 1 • 1 O 233°S,, (T) *35°27'42"N,82°32'40"W s16.4ft ♦2082ft • .- sat �. ! rr t -' ~ '`y 1 p' ,a - r '0� . a' '.§. Previous photo(Spring 2019 inspection)of dispositioned seep P-0 1 location facing southwest. Limited access to seep location due to Plant activities during Spring 2020 inspection. Page 10 of 13 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress, LLC SynTerra o 268°W(T) «?35°28'2"N,82°331"W t16.4ft A 2010ft w ‘,..4 N i . # f ) � � .. � s i a. ` ~• `rr}o ,a + r ' �' a a -- '. .„ 1 ' W, "f A r i . %«� `fit. y �w r- .-,'. x ', 4 f e't' , ',t ! + g 4 ;'^. 9' rk.-See Set n' ', .. . . .. Ponded Water F View of seep location facing west. E 0 360°N(T) • ') . . ') 7 ut: aft ♦2055ft q Fj ?,f' { a • A p i 'y'�•-i,:i>_ by lLA 9: 1 4 Y j. r l,, 4. 1 to ,,! , 4 f la Y� iR 9� .z� f k 5D-01 'i View of dispositioned seep lor,ti ,,n Lacing no!tIi- Page 11 of 13 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra .: ;1 ,,f) • 35°27'50"N,8t2°32'41"W±16.4ft ♦2041ft r -I iimerffottori.. is d ., s `., fie".-... 4!'•.". -4t- 3 4.4 r ,.., ..._.,,,,,,,. .„ . ,;, ,,.:8)t. ' ' %�` % . , r It.'","'t� .V71�```4 ., fi.: e'` N.AAii. a �``��4: 44 ►`► •dik,z~446 L tys. X` ,may,T,t S _vat ya; C .�.ermark-See Sen.- r erp� - 82E0-01 View of seep location facing south. • S___ = 11ir 0 249 • , • , r, ♦2043ft x • k.. . . 1 • iirzlif( i 4 A, `�'€4 !"`'!„1.�. .si/ rye �, `4.i. I i ��4, 4, i ' : '' 4',,.f;fli.L7-'';:( .. .$711';4:.' ;4:ffk+.110101 1 1 82E0-02 view of seep location facing west. Page 12 of 13 • 2020 Interim Seep Report April 2020 Asheville Steam Electric Plant-Duke Energy Progress,LLC SynTerra V(T) • 3b"21 59'NI,U If; ♦ _, - -- # .' -,0041r•':- ...; A 70140 * a .,.� - s 1 s 'ar1 t, ,.... /-. ' ---it`'...' *:,:-.4C4 I."'t ''''- ."4-1. .44-0 1 it -'---4 . .? _ --!,),-- ' ,,,.....„ 1/4. D .. few 4 „tel. ..,4 A4 Ate' . , 1 ill . , i I. .•,< .aaP`' DD-Pipe View of seep location facing west. Page 13 of 13