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Home My WebLink AboutNC0000396_Modification_20191211 ROY COOPER (- t7 Govorner MICHAEL S.REGAN . Secrlerary' mr° LINDA CULPEPPER NORTH CAROLINA lunec to, Environmental Quality December 12, 2019 Duke Energy Progress, LLC. Attn: Gary Whisnant, Plant Manager 200 CPL Drive Arden, NC 28704 Subject: Permit Modification Application No. NC0000396 Asheville Steam Electric Power Plant Buncombe County Dear Applicant: The Water Quality Permitting Section acknowledges the December 11, 2019 receipt of your permit modification application and supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW permitting branch. Per G.S. 150E-3 your current permit does not expire until permit decision on the application is made. Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit. The permit writer will contact you if additional information is required to complete your permit renewal. Please respond in a timely manner to requests for additional information necessary to allow a complete review of the application and renewal of the permit. Information regarding the status of your renewal application can be found online using the Department of Environmental Quality's Environmental Application Tracker at: https://deq.nc.gov/permits-regulations/permit-guidance/environmental-application-tracker If you have any additional questions about the permit, please contact the primary reviewer of the application using the links available within the Application Tracker. Sincerely, .....%9j4j Wren Thedford Administrative Assistant Water Quality Permitting Section ec: WQPS Laserfiche File w/application E Q North Caro rsDepartrrertofEnvronn eats!gut,ty I Dvsonof Water Reso.roes Ashev a Regona Office 12090 U.S.70 Hghway I Swannanoe,North Csro ra 25778 °�r'•��"'�� 828,28E-4530 DUKE �' ENERGY Garry A.Whisnant Plant General Manager PROGRESS Asheville Steam Electric Plant Certified Mail: 7014 1820 0001 7891 3459 Duke Energy Progress ASVL PLT 200 CP&L Dr Arden,NC 28704 File: 12520B o: 828-687-5211 f 828-687-5204 garry.whisnant@ duke-energy.com December 4, 2019 Julie Grzyb Department of Environmental Quality NPDES Complex Permitting Unit RECEIVED 1617 Mail Service Center Raleigh, NC 27699-1617 DEC 11 2019 Subject: Asheville Steam Electric Generating Plant NCDEQIDWRINPDES NPDES Permit NC0000396 Outfall 002 NPDES Permit Modification Request Dear Ms. Grzyb: Asheville Steam Electric Generating Plant coal units are retiring soon. These coal units will then proceed with decommissioning activities. The shutting down of operational systems and decommissioning activities will warrant the need to modify the NPDES permit. It is requested that the NPDES permit be modified to reflect the NPDES related changes. The following and attachments provide the details associated with this permit modification request. The Condenser Cooling Water (CCW) system currently discharges through NPDES Outfall 002 into Lake Julian. When the coal units are retired this system will no longer discharge into Lake Julian. The current average flow from the CCW system is approximately 255 mgd. The cooling water from the evaporator system for the Combustion Turbines currently discharges into the 64-ash basin, which discharges through NPDES Outfall 001 . One of the initial decommissioning activities is to modify the evaporator system's cooling water flow path to discharge into the treatment pond that the CCW system currently discharges into and then exit Outfall 002 into Lake Julian. This treatment pond also receives storm water. The evaporator system is used to cool air at ambient temperatures by the water flowing across filter media into the Combustion Turbine Air Inlet. The cooling of the air increases the combustion efficiency and maintains megawatt production level in the warmer months. There are no chemicals added to the evaporator system. The source of water is service water (raw lake water) from Lake Julian. Julie Grzyb Department of Environmental Quality NPDES Complex Permitting Unit December 4, 2019 The evaporator system is operated typically from May through October. The average flowrate from this system is estimated to be 56 gpm (0.08 mgd). The temperature of this discharge is close to ambient. The evaporator discharge will not begin to discharge to Outfall 002 until after the CCW flow has stopped. The future flow and heat load from the evaporator at Outfall 002 will be significantly less in comparison to the current CCW discharge. Therefore, it is requested that Outfall 002 be modified to include the discharge from the evaporator system and to reflect shutting down of the coal station's CCW. Continuous thermal, flow and chlorine sampling associated with the CCW flows are requested to be removed with this modification as the addition of chlorine at the intake structure has ceased. Attached are sample results from the evaporator cooling water, a process flow diagram that shows the evaporator, an aerial photo identifying the flow paths for the changes described in this submittal and a check for $1 ,030 to process this permit modification request. Should you have questions or need additional information please contact Robert Wylie at 704 382-4669. Sincerely, Garry Whisnant, Plant Manager GM II - Regulated Stations Attachments: A. Evaporator Analytical Data B. Process Flow Diagram C. Aerial Photos Illustrating Current and Future Flow Paths D. Check for Modification Fee cc: Landon Davidson, DEQ, Asheville Regional Office Teresa Williams, Duke Energy Robert Wylie, Duke Energy Attachment A Evaporator Analytical Data Asheville Electric Power Plant NPDES Permit # NC0000396 Evaporator Cooling Water Analytical Results Item Parameter Concentration 1 Chloride 17.2 mg/L 2 Chromium 0.80 ug/L 3 Copper 2.4 ug/L 4 Hardness 26 mg/L 5 Iron 61.9 ug/L 6 Magnesium 3.1 mg/L 7 Manganese 12.8 ug/L 8 Nickel ND 9 Oil and Grease ND 10 Sulfate 6.2 mg/L 11 TDS 99.0 mg/L 12 TSS ND 13 Zinc ND ND = Not Detected Note the temperature should be approximately the same as the ambient temperature. Attachment B Process Flow Diagram Combined and Simple Cycle Combustion Turbine Plant • Ultrafiltrat;on Service Water/Fire Water Service Water Equipment Drains Ejuia) NI >111 ) �� Tank ----> Users ----> Sump Simple Cycle Existing Evaporator Cooling and 7 Outfall 002 Lake Julian Stormwater Drains Unit 07/OS Raw Standby RO/Dem;n -� Water7upply > Trailers Existing Unit 3 and 4--> Simple Cycle Simple Cycle CTG Water Two-Pass Reverse Osmosis D Mixed-Bed Demineralized ` Demineralized Water Injection -----> Demineralizer ,-----> Water Tanks ,_.> CTG NOx Injection /\ Storage Tanks Simple Cycle CTG ® Atmosphere I( D Water Wash I I Atmosphere V ) ® HRSG Blowdown HRSG Cooling Tower&Basin ) Tank/Sump V A V Water Treatment ) 1( CTG Wash Building Sump V Water > Transfer Truck ) A Sample Panel / n Unit 07/08 Cooling Tower Unit 07/08 V Blowdown Oil-Water Separator Unit 07/08 Sludge Side-Stream 001C 001B Sludge Thickener I Thickener < Filters Unit 05/06 Oil-Water A Separator O01D V V V VV <UudgeThkener Filter Press Unit OS/06 Secondary �� (Shared) CoolingTowerWasteWaterSump Sli Blowdown 001A ) (Shared) ) easing ____> French Broad River Outfa11001 > Transfer Truck / Existing Ash pond /Exsting Fuel Oil Footing Fuel Oil LRB/WTS C oB-water t { Area Separator ` Stormwater -- -- Process Flow Diagram Duke Energy Progress,LLC Asheville Steam Electric Plant Buncombe County, November 2019 Attachment C Aerial Photos Illustrating Current and Future Flow Paths Asheville plant current NPDES flows KEY <--- Ash Treatment—Sluice lines to Rim Ditch, +, 9 Center Pond,Filter Skid,pH building,outfall 001 �+al ', Plant Drains, Coal Pile Run off RO, *t =4.1 OWS(LVSW) ' W WT—FGD Slowdown(currently to POTW) It' 1., rtt_ ,i 1964 Basin Dewatering(Duck Pond)- 9 ' AIL LVSW,Ash removal decant,Industrial SW, 4 tila ~` ' r " ' Once through Cooling�, g g—outfall 002 ,- - j ) ru Industrial SW Permit area(SW1,3 .it 'r." -, •i;,,�;A;K * l' Duke En . '�� River Pump make up to Lake Julian .• 41�P Asheville n t Ka_ ' an ',4 'tP- 002 4 v • 'NSitts, ..:-'-'A-': '-'. ,?. - . N'LL.'-'"4".,' -' _,• - itR. • S ♦� Mlf n Dam is removed- �' .+ A ' 'W. - ,� ,. ys -- �4 s - future industrial r `ti � s��,�y- r; 'R ` " . Stormwater flows A " :*•; �� I y yT a� �kl�ram_ * 'n */_r f : _ �t � 4�.._s as ,,, '_�i:fit '_'�.y+ „ .r. J.4 '�l" a Asheville plant current NPDES flows at Coal Plant Shut down/CC start KEY ( Waste water line to outfall 001 -, �_ Demo- Plant Drains,Coal Pile Run . off, LVSW, Existing OWS iy,W — i F—W WT FGD Slowdown(currently to MSD) P+ `• 1964 Basin Dewatering ‘k , {. l. • . LVSW,Ash removal decant,Industrial SW, `. ,,Convert Once through Cooling—outfall '' ; 002 to CT EVAP Cooler/stormwater 1. 4--Industrial SW area—adding upper back ... 001 �,* road, Fuel oil,CC ,, 713• • • River Pump make up to Lake Julian .., - Duke F.teryy� 4raevillc Platt 002\`r- Extraction r. �k Well ` I Future NPDES yy y 2i, f' • Modification �dM► t !;:^i Y� LQt + tW `V4 • , •te` 001B 101D , , :4 k- ., - C Plan 001C f k(1.' . ,/ r, f , • ',,,'Alk,1*. IL,iti, ot., t. 411 i- '' 4. t •^t'+I. _ �' .r.4. -S.M ;ram , + 6F1 - i Cr \ r ',sp a + e v v�� air T �► ' 4 � �'Aa ,,, "441 � �r v.l' .M.. ♦ to • Attachment D Check for Modification Fee