DEQp00021551

Division of Water Quality
November 28, 2000
MEMORANDUM
To: Paul Rawls
Water Quality Supervisor, FRO
Through: Matt Matthews rr'f
Supervisor, Aquatic Toxicology Unit
From: Sandy Mort qSk
Quality Assurance Officer, Aquatic Toxicology Unit
Subject: Whole effluent toxicity test results
Dupont De Nemours 001 & 002
NPDES Permit # NC0003573/001
Bladen County
The aquatic toxicity test using 24-hour composite samples of effluent discharged from Dupont
De Nemours 001 & 002 has been completed. Dupont De Nemours has an effluent discharge
permitted at 17 million gallons per day (MGD) entering Cape Fear River (7Q10 of 791.0 CFS).
Whole effluent samples were collected on November 14 and 17 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 3 -Brood Ceriodaphnia dubia pass/fail
Test Concentrations 3.3% sample
Test Result Pass
Control Survival
100%
Control Mean Reproduction
25.8 neonates
Test Treatment Survival
100%
Treatment Mean Reproduction
28.6 neonates
First Sample pH
7.74 SU
First Sample Conductivity
481 micromhos/cm
First Sample Total Residual Chlorine
<0.1 mg/1
Second Sample pH
7.55 SU
Second Sample Conductivity
478 micromhos/cm
Second Sample Total Residual Chlorine
<0.1 mg/l
Test results for these 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
Environmental Sciences Branch Water Quality Section

JAN 1 9 2.001
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