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Home My WebLink AboutNC0027332_Correspondence_20051219NPDES DOCIMENT SCANNING COVER SHEET NPDES Permit: NC0027332 Chatuge Hydro Plant Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Engineering Alternatives (EAA) Correspondence Instream Assessment (67b) Speculative Limits Environmental Assessment (EA) Permit History Document Date: December 19, 2005 This document is printed on reuse paper - izore any content on the reszerse wide *NPDES Correspondence 1VA Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402-2801 December 19, 2005 J;\ N - 3 2006 NCDNR/Division of Water Quality/SWGPU Attention: Bob Guerrat 1617 Mail Service Center Raleigh, North Carolina 27699-1617 TENNESSEE VALLEY AUTHORITY - HIWASSEE HYDRO PLANT (HUI) NPDES PERMIT NO. NC0027359 AND CHATUGE HYDRO PLANT (CTH) NPDES PERMIT NO NC0027332 - OUTFALL SAMPLING METHODOLOGY Dear Mr. Guerrat: This letter is being submitted in response to your conversation with Melissa Tupps on December 7, 2005, concerning the sampling of outfalls at HIH and CTH. Pursuit to the North Carolina Laboratory Certification Protocol, we have resampled and resubmitted results to your office on Hill Outfalls 001, 002, and 0005 relating to oil and grease and pH in accordance with our permit. All four samples for each outfall were collected on the same day but at different times. Outfall 002 which is waters from draft tube unwatering operations is an intermittent discharge. If all four samples are not collected during the unwatering event, it is possible that we would not be able to collect the required four samples since there may not be four unwatering events during the permit life. There are two sample locations for HIH Outfall 005 which are waters from the lower and upper gallery drains, and waters from Unit 2 floor drains and wheel pit leakage. Samples are collected from the small Unit 2 sump as well as the sump in the dam. Both of these sumps are routed to Outfall 005. The small unit 2 sump routes into the sump in the dam then is discharged from Outfall 005. In the December 7, 2005, conversation, you suggested that we should only pull samples from the sump in the dam. Enclosed for your convenience is a letter dated August 17, 200. , discussing each outfall location and enclosed schematic drawings. We plan on resampling the outfalls at CTH. Currently no unwatering events are planned so it may not be possible for us to recollect the four samples for Outfall 002. If there is an unwatering event, we would need to collect all four samples on the same day but at different times. We would also plan on collecting the four samples for Outfall 001 in the same manner. *NPDES Correspondence 2 Please provide us with guidance concerning the sampling of Outfall 005 at HIFI and the collection of all four samples on the same day but at different times at Hill and CTH. If you require further information, please contact Melissa Tupps at 423-825-3008. George Pigg Hydro Production Area Manager Central Hydro Production Area Enclosure mst cc (Enclosures): EDMS, SP 1D-C (*NPDES Correspondence, #1820) J. K. Watts, LP 5D-C Frank Barber, HIH 1A MRN (Plant File No. #1820) Prepared by Melissa Tupps and Reviewed by Frank Barber Environmental Document Type: NPDES Correspondence August 17, 2005 Mr. Keith Haynes Department of Environment and Natural Resources Division of Water Quality 2090 U.S. Highway 70 Swannanoa, North Carolina 28778 Dear Mr. Haynes: Reference: August 4 letter from Keith Haynes to Janet Herrin - Compliance Evaluation Inspection Report - Hiwassee Hydro Plant (HIH), - National Pollutant Discharge Elimination System Permit Number NC0027359 Per your request in the referenced report, enclosed are plant system schematic drawings 47W2303SR5 (Valve Operation Diagram - Unwatering and Filling Systems) and 47W2306S412 (Valve Operation Diagram - Raw Water System) showing the locations of all outfalls at HIH. The minimum normal operating tail water level at HIH is at elevation 1272.5. The discharge elevation for each outfall is listed below: Outfall #001 Outfall #002 Outfall #003 Outfall #004 Outfall #005 Discharge Elevation 1265.17 Discharge Elevation 1270.0 Discharge Elevation 1268.5 Discharge Elevation 1264.0 Discharge Elevation 1267.0 All the outfalls are below the minimum tail water levels and, therefore, are not visible from the surface. Mr. Keith Haynes Page 2 August 17, 2005 If there are any questions or additional information required, please contact Melissa Tupps at (423) 825-3008. Sincerely, (Original Signed by Janet C. Herrin) Janet C. Herrin Senior Vice President River Operations MST:LCB Enclosures cc (Enclosures): Frank H. Barber, HIH 1A-MRN Neil E. Carriker, 2U-C Bridgette K. Ellis, \»T 11 B-K Wayne L. Poppe, LP'3QC Melissa S. Tupps RAC 1Ik-C Janet K. Watts, LP 5D-C EDMS, WT 10D-K Prepared by Melissa S. Tupps, approved by Neil E. Carriker and Wayne L. Poppe. 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AN-1 (UNIT 1)) AS-2S (wtT 2) m ONO 141rn0 r011 nO atATIOtlQ ORS VOA POWERHOUSE SEWAGE DISPOSAL SYSTE NOTES L COVO01T ORD RA40010 SOCIO Wirt MOT 00eae0 swan Nrrtvwr 1M MN 00 Otr 1N IFis 2. w100 NC LISIIS MOOR ON INUS WARM 110N IT IS OOVOCIO w10S 08.1: LIST 1131 0OJD1Q to FIT O1 DI Ddr wK 0 OISR UM FROM ROM VAL a OOY011 11111-03-005-N12 TO DC 10101E MOM 1 CaOOCMT M110 /ASAOIS t4S WC Ip1ARIO STOW NO 111-0-1MMRDD0 AU1 - WON FAUN . RA11E KO = ow YOLK ORS A MOM IV . 103OORIC CO - OCOt 1ALK NOTES WRVS ROAR Qp11a MI DIIS PARING POTATO t INCSAIRSO IN OI ROICUX 11}U10A1a100 D DAN to-111ACC o17WAl REFERENCE DRAWINGS 470100-1-- ML . OF w1R1K-Y3LK 11MCD TOR 'ea ♦70OD-3---SILL K NATa11K-YYK NAO. DWI SCSI ADR1300.-- 1030 O OIATIO1 01AOUY-!TYo0L1 0 0Ob PROJECT REVISION NISI PS 1 1 SFt I b' Iatl 11e1P 1 N R3Ilit0 Atlualr 41 [t21 Itc 1-1—I f00[ i---1 SCALE: NONE PO*ERHCUSE !I DAM VALVE OPERATION DIAGI UNWATERING & FILLING SYSTEM • — I IA�AI�1 1 1 7 P 1 —I HIWASSEE PROJEC TENNESSEE VAU.EY AUTI. 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