DEQp00021955

Division of Water Quality
August 12, 2004
MEMORANDUM
To: Paul Rawls
Water Quality Supervisor, FRO
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Through: Matt Matthews r''
Supervisor, Aquatic Toxicology Unit
From: Sandy Mort 46}v
Quality Assurance Officer, Aquatic Toxicology Unit
Subject: Whole effluent toxicity test results
Dupont -Fayetteville Works
NPDES Permit # NC0003573/001
Bladen County
The aquatic toxicity test using samples of effluent discharged from Dupont -Fayetteville
Works has been completed. Dupont -Fayetteville Works has an effluent discharge permitted
at 17 million gallons per day (MGD) entering Cape Fear River (7Q10 of 356 CFS). Whole
effluent samples were collected on August 3 and 6, 2004 by Dale Lopez for use in a chronic
Ceriodaphnia dubia pass/fail toxicity test. The first sample was collected as a 24-hour
composite, while the second sample was collected as a grab due to a sampler malfunction.
The test using these samples was invalidated due to control organism performance and may
not be used for compliance monitoring purposes. Toxicity test information follows.
Test Type 3 -Brood Ceriodaphnia dubia pass/fail
Test Concentrations 3.3% sample
Test Result Invalid
First Sample pH 7.81 SU
First Sample Conductivity 356 micromhos/cm
First Sample Total Residual Chlorine 0.434 mg/L
Second Sample pH 7.56 SU
Second Sample Conductivity 183 micromhos/cm
Second Sample Total Residual Chlorine 0.0984 mg/L
Please contact us if further effluent toxicity monitoring is desired. We may be reached at
[phone].
Basin: CPF18
cc: Central Files
Environmental Sciences Branch water �2uamy 3ecuon

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