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Home My WebLink AboutNC0025321_Whole Effluent Toxicity Results_20210902Division of Water Resources September 2, 2021 MEMORANDUM To: Landon Davidson Water Quality Regional Operations, ARO Through: Cindy A. Moore Supervisor, Aquatic Toxicology Branch (ATB) From: Lorimar S. Henning Environmental Specialist II, Aquatic Toxicology Branch (ATB) Subject: Whole effluent toxicity test results Waynesville WWTP NPDES Permit # NC0025321/001 Haywood County The aquatic toxicity test using flow-proportional composite samples of effluent discharged from the Waynesville WWTP has been completed. Waynesville WWTP has a permitted effluent discharge of 6.0 million gallons per day (MGD) entering Pigeon River (7Q10 of 95 CFS). Whole effluent samples were collected on August 10 and August 12 by Mikal Willmer and facility representative Mark Jones for use in a chronic Ceriodaphnia dubia pass-fail toxicity test. The test passed. Toxicity test information follows. Test Type 3-Brood Ceriodaphnia dubia chronic pass-fail Test Result Pass Test Concentrations 9% Control Survival 91.7% Control Mean Reproduction 25.8 neonates Test Treatment Survival 100% Treatment Mean Reproduction 27.3 neonates First Sample pH 6.82 SU First Sample Conductivity 2360 micromhos/cm First Sample Total Residual Chlorine <0.2 mg/L Second Sample pH 7.28 SU Second Sample Conductivity 2180 micromhos/cm Second Sample Total Residual Chlorine <0.2 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 Environmental Testing Solutions, Inc. (ETS). The chronic Ceriodaphnia 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 may be reached at cindy.a.moore@ncdenr.gov and lorimar.henning@ncdenr.gov. Basin: French Broad cc: Mikal Willmer (ARO) DocuSign Envelope ID: FEFDEA3B-A1AB-4B06-A519-81A81000EBCE