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Home My WebLink AboutNC0004987_Report_20190424 c.( DUKpE James Wets ENERGY® s Vice President Environmental,Health and Safety Programs&Environmental Sciences 526 South Church Street Mail Code EC13K Charlotte,NC 28202 (980)373-9646 April 24, 2019 Via Overnight Mail Corey Basinger RECEIVEC/DFNRJDWR Mooresville Regional Office Regional Supervisor North Carolina Department of Environmental Quality APR 29 2019 Division of Water Resources Water Resources - Water QualityRegional Operations Water Pg Section s g� P P®r►raii.;iny Section 610 East Center Avenue, Suite 301 Mooresville, NC 28115 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 17-009 Duke Energy Carolina, LLC— Marshall Steam Station NPDES Permit NC0004987 2018 Annual Seep Survey Report Dear Messrs. Basinger and Sledge: On behalf of Duke Energy Carolinas, LLC (DEC), I am submitting to you the Marshall Steam Station Annual Seep Report summarizing the findings of the comprehensive survey as required by the Marshall Steam Station NPDES Permit NC0004987 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. Basinger and Sledge April24, 2019 Page 2 Please direct any questions concerning the Marshall Steam Station NPDES Permit NC0004987 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. Since - , James W;lls Vice Pres dent, Environment, Health & Safety- Programs .r d Environmental Sciences Duke Energy Attachment: Marshall Steam Station 2018 Annual Seep Survey CC: Richard Baker, Duke Energy Robert Wylie, Duke Energy Chris Hallman, Duke Energy Scott La Sala, Duke Energy Paul Draovitch, Duke Energy Matt Hanchey, Duke Energy gY synTerra 2018 ANNUAL SEEP REPORT MARSHALL STEAM STATION EMC SOC WQ S17-009 8320 NC HIGHWAY 150 E TERRELL, NC 28682 APRIL 2019 PREPARED FOR DUKE ENERGY CAROLINAS, LLC DUKE ENERGY CAROLINAS • • Erin N. ey, EIT Proj ct Engineer Brian 4Vilker, NC LG #2546 Project Manager 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra TABLE OF CONTENTS SECTION PAGE 1.0 INTRODUCTION 1 2.0 FINDINGS 3 2.1 General Observations 3 2.2 Impact of Decanting 3 2.3 Changes to Seep Status 3 3.0 REFERENCES 4 LIST OF FIGURES Figure 1 SOC Locations and Inspection Areas LIST OF TABLES Table 1 SOC Locations and Descriptions-2018 Inspection LIST OF APPENDICES Appendix A Photographs Page i 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra LIST OF ACRONYMS AOW Areas of Wetness CCR Coal Combustion Residuals EMC Environmental Management Commission SOC Special Order by Consent Page ii 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra 1.0 INTRODUCTION On June 7, 2018, Brian Wilker(NC L.G. #2546) of SynTerra inspected the Marshall Steam Station (Marshall or Site)for existing and potential new areas of wetness (AOWs). The aforementioned activities were performed in accordance with North Carolina EMC Special Order by Consent WQ#S17-009. That Special Order by Consent (SOC) describes inspection requirements as follows: Duke Energy shall conduct annual comprehensive surveys 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 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 must 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: • No previously unidentified seeps were observed during the inspection. • No notable changes to seep status were observed during this inspection. • Decanting had not begun at the time of this inspection. Page 1 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra Inspection Details Weather during and preceding the inspection was clear. Temperatures ranged from approximately 79 to 89 degrees F. No precipitation was recorded on the day of the inspection or during the three days before the inspection according to the onsite rain gage. The inspector reviewed previous AOW inspection reports and the weekly dam safety inspection reports pertaining to each ash basin.Dan Zakary (Duke Energy system owner) conducted the ash basin dam safety inspections and prepared the reports. Mr. Zakary was interviewed concerning recent rainfall, construction/stabilization projects associated with the ash basins, and general site conditions in and around the ash basin. Observations from the dam safety inspection reports were consistent with observations made during the SOC inspection. The inspection included observations about the following areas (Figure 1): • Along the northwest shore of Lake Norman • Areas between the ash basin and receiving waters • Drainage features associated with the basins The inspection scope of work included a review of the areas identified as downgradient of the ash basins. SOC locations are shown on Figure 1. Observations noted during the inspection are summarized on Table 1. Photographs of each seep location are included in Appendix A. Page 2 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra 2.0 FINDINGS 2.1 General Observations Inspection observations are shown for each seep in Table 1. Details include: • Recent high water marks (silt deposition, mud-caked vegetation) were observed along the shoreline of Lake Norman. The Lake Norman water level appeared higher than the water level in previous inspections, as certain shoreline lowlands that had previously been dry were observed as being inundated. • One saturated area was observed at the discharge area of an engineered slope drain pipe on the backside of the emergency spillway. No flow was observed at that location;however, stagnant water was present. The area was documented as appearing wet in the Fall 2017 AOW inspection as well. 2.2 Impact of Decanting Decanting of the ash basin at Marshall had not begun at the time of this inspection. 2.3 Changes to Seep Status Mr. Wilker inspected each seep to evaulate whether it may 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 dispositioned during 2018 were done so at the time of the SOC issuance. Table 1 lists those seeps dispositioned and the basis for disposition. Seep S-03 was identified as dispositioned at Marshall. These dispositioned seeps will continue to be inspected and evaluated for any change in flow conditons. In general, there was no change in status of the dispositioned seeps and no change in status of remaining seeps observed during this inspection. Page 3 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra 3.0 REFERENCES North Carolina Department of Environmental Quality. (2018). Special Order by Consent EMC SOC WQ S17-009. Page 4 I 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra FIGURE ' , ..- -___ ..:%l. ', I I . f `w O. 1 .r IIv .�,• • a ,/ .l`. ' 1 \ .' . u q 'to.' 'O • 6 ..;' . '! .,61..'s^ 'far- l ,J=__l I • ..,_.?. LEGEND �' t / , NON-CONSTRUCTED SEEP(APPROXIMATE) • • DISPOSITIONED SEEP(APPROXIMATE) "''�"`�°'" 'iJ �' ,.' ASH BASIN WASTE BOUNDARY • .: .y'' ` • ---�—LANDFILL BOUNDARY ♦ �*...--L,2 ; STRUCTURAL FILL BOUNDARY • --- ASH BASIN COMPLIANCE BOUNDARY 4A ,. .,� LANDFILL COMPLIANCE BOUNDARY I DUKE ENERGY CAROLINAS MARSHALL PLANT :-�.3-y'Ir 7 . _ „�,,,,..., —__SITE BOUNDARY ' "=�1'�n u -r., .• 0 STREAM(MCKIM&CREED) � a �,r;°F SPECIAL ORDER BY CONSENT(SOC)INSPECTION AREA WETLAND(MCKIM 8 CREED) e 1 --.._... •' .. ,• NOTES: •` ♦ r 1 } •e SECIAL ORDER BY CONSENT(SOL)LOCATION6 ARE DESCRIBED IN EMC SOC NA 17.006 `'w • STREAM AND WETLAND DELINEATION CONDUCTED BY MCKIM 8 CREED MARCH 2O16 `' -.. a . PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS. ` AERIAL PHOTOGRAPHY OBTAINED FROM GOGGLE EARTH PRO ON JULY 26.2016. AERIAL WAS COLLECTED ON MARCH 3.2016. \ ♦ DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINASTATE PLANE COORDINATE SYSTEM FIPS]2001NA063R0111. � '. 6LD D 63D FIGURE 1 P„w°, - • •"F 0 `R"°""UANYE""" o SOC LOCATIONS AND INSPECTION AREAS ,, synTerra 346 R VER STREET SU TE 220 GREENYLLE 6DurHCARDLNA296D1 MARSHALL STEAM STATION ?--...—.. • pNONE8644219999 D DUKE ENERGY CAROLINAS,LLC "I �, ,' ENERGY °"""'""" .ER °"IE'°°'°""' TERRELL,NORTH CAROLINA (.,DUKE A ,o e'' CHECKED.E K 6EY 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra TABLE • TABLE 1 SOC LOCATIONS AND DESCRIPTIONS-2018 INSPECTION MARSHALL STEAM STATION DUKE ENERGY CAROLINAS,LLC,TERRELL,NC Location Coordinates Receiving Receiving Facility Sample ID Latitude Longitude Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection Classification General groundwater seepage forming a Water appears slightly deeper and more wet area that flows to an approximately 2 stagnant than previously observed.Wetland UT to Catawba River Monitoring at point prior to pH 5-10 S.U. complex downgradient Is holding more surface Marshall S-01 35.6117 -80.9604 WS-IV;B;CA foot wide natural channel,located (Lake Norman) northeast of the active ash basin,then entering Lake Norman. Hardness 200 mg/L water than previously observed.Orange Flows to Lake Norman. aerobic bacteria/floc/iron-oxidation sheen on substrate. Located east of active ash basin,minor area of wetness(AOW)between basin dike Marshall S-02 35.6066 -80.9589 Catawba River WS-IV;B;CA and river bank.Intermittent flow from Instream Monitoring of NA-2B Standards Apply Orange aerobic bacteria/floc/iron-oxidation was (Lake Norman) Lake Norman observed on substrate. culvert directs seasonal flow to Lake Norman. Located east of active ash basin,minor Catawba River area of wetness between basin dike and Marshall S-03** 35.6067 -80.9591 (Lake Norman) WS-IV;B;CA river bank.AOW was determined to be NA-Seep Dispositioned NA-28 Standards Apply Area was dry. same area of wetness as S-02 above. Located east of active ash basin,non- Evidence In surrounding area of high water flowing AOW in wetland area between levels in Lake Norman.Mud-caked vegetation • Marshall 5-04 35.6064 -80.959g Catawba River WS-IV;B;CA basin dike and river bank.Potential sheet Instream Monitoring of NA-2B Standards Apply was observed in this area.Apparent bog area is (Lake Norman) flow towards Lake Norman primarily during Lake Norman saturated with visible surface water.No wet season. observable flow. Prepared by:GL>f Checked by:y_i_c ham '-Location previously Investigated as a seep.Monitoring has not indicated the presence of coal combustion residuals. ••-Seep dlspositioned via repair and/or non-flowing condition to potentially reach Waters of the U.5.,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. 2B-15A NCAC 02L.0202 Standard AOW-Area of Wetness milograms per liter NA-Not Applicable 5.U..Standard Units SOC-Special Order by Consent UT-Unnamed Tributary SOC Tabies_ALL_Final_2019_04 tt Page 1 of 1 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra APPENDIX A PHOTO GRAPHS • 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra i ,Oj ,", ay -„ ;,'. - :t., „s;i:;,,,•'.... $f : .iir. .' y 10 y� 1ll s3/%`qt ?. _30 S 01 View of seep location facing west. t t ti F " a ar"� 5 ] A.O.W.• o � r fir{ "r �s. , t . ..Z • / . ., aa T. • 4 try W etj x, r I iii, ,,...,_ , _.., .4. ' aty^14,:i.,;,„:::' cjig,, 4' ".`•, .et '• s' .., ^ irigiiitilt. S-02 View of seep location facing north-northwest. 0 synTerra • 2018 Annual Seep Report April 2019 Marshall Steam Station,Duke Energy Carolinas,LLC SynTerra 4 y� ,g/'',« . ♦ - ,yam L it,1" s r _ J � � per : i, 4,,,, , , _ , po _ .,... ,,,_:. .., 4•-h. -,-."--,--. - „ ,�,. ' .4. ,r a. -'cam.. ,, I, `..:�. ✓+fir h.> ! x H.- ,i. 4 I S-03 View of dispositioned seep location facing west. y k. R� �t ii,,'i x • ,. f, ' We rMKx4 f!.�j _ off` / s." !. • + r� �l ,',. i 1 , $ . '`;t ; ma y,' '. �.�1(0 a„� } . . .1t..•..,, -,fey, ,,,,,,,,,lf,.. --,,bi, ... ,,,. , ...„,, 4 4 . ♦ {Y� ' ' r 1/Nit Nt,it e k :. ,� ! A , „„. :‘,. . 1,4 , ; 1 ,,,erri . fk... i r442,L '. , ... r, °,41 eitt , - , . ti iii 1,74,- ' i i r 1 v.'', 1 S-04 I View of seep location facing west-northwest. synTerla