HomeMy WebLinkAboutNC0024236_Toxicity results_20211021DocuSign Envelope ID: 9C155E2C-12B7-4022-8AB7-AB8193D5516B
Division of Water Resources
October 21, 2021
MEMORANDUM
To: David May
Water Quality Regional Operations, WaRO
DS
Through: Cindy A. Moore CH
Supervisor, Aquatic Toxicology Branch (ATB)
From: Lorimar S. Henning
Environmental Speci st-II, Aquatic Toxicology Branch (ATB)
IA
Subject: Whole effluent toxicity test results
Kinston -Regional WRF
NPDES Permit # NC0024236/001
Lenoir County
The aquatic toxicity test using constant time/constant volume samples of effluent discharged
from the Kinston -Regional WRF has been completed. Kinston -Regional WRF has a permitted
effluent discharge of 11.85 million gallons per day (MGD) entering the Neuse River. Whole
effluent samples were collected on October 5 and October 7 by the facility representative,
Zachary Johnson, 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 6.1%
Control Survival 100%
Control Mean Reproduction 25.2 neonates
Test Treatment Survival 100%
Treatment Mean Reproduction 27.2 neonates
First Sample pH 7.72 SU
First Sample Conductivity 2230 micromhos/cm
First Sample Total Residual Chlorine <0.2 mg/L
Second Sample pH 7.82 SU
Second Sample Conductivity 2160 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 Meritech, Inc. The chronic
Ceriodaphnia dubia pass/fail test run by Meritech, Inc. 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: Neuse
cc: Robbie Bullock (WaRO)