DEQp00022006

Division of Water Quality
February 28, 2011
MEMORANDUM
To: Belinda Henson
Surface Water Protection, FRO
Through: Cindy A. Moore lav
Supervisor, Aquatic Toxicology Unit
From: Carol Hollenkamp N
Quality Assurance Officer, Aquatic Toxicology Unit
Subject: Whole effluent toxicity test results
Dupont De Nemours
NPDES Permit # NC0003573/001
Bladen County
The aquatic toxicity test using composite samples of effluent discharged from Dupont De Nemours has
been completed. Dupont De Nemours has an effluent discharge permitted that is 17.0 million gallons
per day (MGD) entering the Cape Fear River (7Q10 of 791.0 CFS). Whole effluent samples were
collected on February 15 and February 17 by facility representative Jamie Lewis (witnessed by Dale
Lopez) 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
Test Concentrations
Test Result
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 Ceriodaphnia dubia chronic pass fail
3.3%
Pass
92%
20.3 neonates
100%
16.3 neonates
7.77 SU
606 micromhos/cm
<0.1 mg/L
7.90 SU
693 micromhos/cm
0.10672 mg/L
The samples were split and sent to Meritech Inc. for testing. The chronic pass fail test conducted by
Meritech also passed at 3.3%. 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 further effluent toxicity
monitoring is desired. We may be reached at [phone].
Basin: CPF16
cc: Central Files
Dale Lopez, FRO
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APR 1 2 2011
Information Processing Uriif
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Aquatic Toxicology Unit Environmental Sciences Section