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Home My WebLink AboutNC0004961_Bioassay Compliance Inspection_20171113WazerResources ENVIRONMENTAL QUALITY November 13, 2017 Mr. Ronnie Goodman, Superintendent Power Generation Operations/Plant Demolition Duke Energy Carolinas. LLC Riverbend Steam Station 175 Steam Plant Road Mount Holly, NC 28120 Dear Mr. Goodman: ROY COOPER Governor MICHAEL S. REGAN Secretary LINDA CULPEPPER Interim Director RECEIVEDN0n. D,21DWR NOV 2 7 2017 wate1 ;_cssai ty Permitting Sel'-011 Subject: Bioassay Compliance Inspection Riverbend Steam Station NPDES Permit No. NC0004961 Gaston County Enclosed is a copy of the laboratory results for the effluent samples collected during the Bioassay Compliance Inspection performed at the subject facility on November 7, 2017, by Ori Tuvia and Brandy Costner. The sampling results revealed that the facility passed the Whole effluent toxicity test (see attached results). Please inform the facility's Operator -in -Responsible Charge (ORC) of our findings by forwarding a copy of the enclosed report. Should you have any questions concerning this report, please do not hesitate to contact Ori Tuvia at (704) 235-2190, or at ori.tuvia@ncdenr.gov. Sincerely, Ori Tuvia, Environmental Engineer Mooresville Regional Office Division of Water Resources, DEQ Cc: NPDES Unit MRO Files Richard Massey (E -Copy) Mooresville Regional Office Location. 610 East Center Ave., Suite 301 Mooresville, NC 28115 Phnnc MAI RRA_i RQQ 1 Fav MAI RRA.Rndri l r i vztnmRr GarwIra• 1.A77.01_R7AR Division of Water Resources November 17, 2017 MEMORANDUM To: Corey Basinger Water Quality Regional Operations, MECO --- Through: CindyA Moore Supervisor, Aquatic Toxicology Branch (ATB) From: Carol Hollenkamp (` Quality Assurance Officer, Aquatic Toxicology Branch (ATB) Subject Whole effluent toxicity test results Duke Power— Riverbend Steam Station Power Plant NPDES Permit# NC0004961/002 Gaston County The aquatic toxicity test using grab samples of effluent discharged from Duke Power's Riverbend Steam Station Power Plant has been completed The Duke Power Riverbend Steam Station facility discharges to the Catawba River (7Q10 of 80 0 CFS), Whole effluent samples were collected on November 7 and November9 by Ori Tuvia and facility representative Rick Massey for use in a chronic Cenodaphnia dubla pass -fad toxicity test. The test passed Toxicity test information follows Test Type Test Result Test Concentrations Control Survival Control Mean Reproduction Test Treatment Survival Treatment Mean Reproduction First Sample pH First Sample Conductivity First Sample Total Residual Chlorine Second Sample pH Second Sample Conductivity Second Sample Total Residual Chlorine 3 -Brood Cenadaphnia dubio chronic pass -fad Pass 27% 100% 22 3 neonates 100% 215 neonates 7 60 SU 425 micromhos/cm <0 1 mg/L 7,55 SU 424 micromhos/cm <0 1 mg/L Test results for the above samples indicate that the effluent would not be predicted to have water quality impacts These samples were split and tested by ETS The chronic Cerrodaphnia dubia pass/fail test run by ETS resulted in a pass. Please contact us if you have any questions or if further effluent toxicity monitoring is desired We maybe reached at (919) 743.8401 Basin Catawba cc- On Tuvia (MRO)