NC0026271_Regional Office Historical File Pre 2018 (41)

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Division of Water Quality
March 28, 2012
MEMORANDUM
To: Rob Krebs
Surface Water Protection, MRO
Through: Cindy A. Moore qox�icology
Supervisor, Aquatic Unit
From: Carol Hollenkamp
Quality Assurance �fficer, Aquatic Toxicology Unit
Subject: Whole effluent toxicity test results
Taylorsville WWTP
NPDES Permit # NCO026271/001
Alexander County
The aquatic toxicity test using flow proportional composite samples of effluent discharged from Taylorsville
WWTP has been completed. Taylorsville WWTP has an effluent discharge permitted that is 0.83 million
gallons per day (MGD) entering the Lower Little River (7Q10 of 14.4 CFS). Whole effluent samples were
collected on March 13 and March 15 by John Lesley and facility representative Brian Eades for use in a
chronic Ceriodaphnia dubia pass -fail toxicity test. The test using these samples resulted in a pass. Toxicity
test information follows.
Test Type 3-Brood Ceriodaphnia dubia chronic pass fail
Test Concentrations 8.2%
Test Result
Pass
Control Survival
100%
Control Mean Reproduction
27.3 neonates
Test Treatment Survival
92%
Treatment Mean Reproduction
31.8 neonates
First Sample pH
7.24 SU
First Sample Conductivity
425 micromhos/cm
First Sample Total Residual Chlorine
<0.10 mg/L
Second Sample pH
7.30 SU
Second Sample Conductivity
525 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 on receiving water. Please contact us if you have any questions or if further effluent toxicity
monitoring is desired. We may be reached at [phone].
Basin: CTB32
cc: Central Files
John Lesley, MRO
Aquatic Toxicology Unit Environmental Sciences Section