NC0025445_Report_20200320

Division of Water Resources
March 20, 2020
To: Lon Snider
Water Quality Regional Operations, WSRO
Through: Cindy A. Moore
Supervisor, Aquatic Toxicology Branch (ATB)
From: Lorimar S. Henning f�'q
Environmental Specialist II, Aquatic Toxicology Branch (ATB)
Subject: Whole effluent toxicity test results
Randleman WWTP
NPDES Permit # NC0025445/001
Randolph County
The aquatic toxicity test using flow -proportional composite samples of effluent discharged from
the Randleman WWTP has been completed. Randleman WWTP has a permitted effluent
discharge of 5.0 million gallons per day (MGD) entering Deep River (7Q10 of 1.745 CFS). Whole
effluent samples were collected on March 10 and March 12 by Mike Mickey and facility
representative Brett Grimsley 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 35%
Control Survival 100%
Control Mean Reproduction
26.5 neonates
Test Treatment Survival
100%
Treatment Mean Reproduction
27.1 neonates
First Sample pH 6.77 SU
First Sample Conductivity 351.0 micromhos/cm
First Sample Total Residual Chlorine 0.16 mg/L
Second Sample pH 7.17 SU
Second Sample Conductivity 332.0 micromhos/cm
Second Sample Total Residual Chlorine 0.10 mg/L
Test results for the above samples indicate that the effluent would not be predicted to have
water quality impacts. Please contact us if you have any questions or if further effluent toxicity
monitoring is desired. We may be reached at [phone].
Basin: Cape Fear
cc: Mike Mickey (WSRO)