NC0004308_Whole effluent toxicity test results_20180327 (3)

Division of Water Resources
March 27, 2018
To: Corey Basinger
Water Quality Regional Operations, MRO
Through: Cindy A. Moore
ofL­_�
Supervisor, Aquatic Toxicology Branch (ATB)
From: Carol Hollenkamp
Quality Assurance Officer, Aquatic Toxicology Branch (ATB)
Subject: Whole effluent toxicity test results
Alcoa Badin Business Park Outfall 012
NPDES Permit # NC0004308/012
Sta n ly County
The aquatic toxicity test using composite samples of effluent discharged from the Alcoa Badin
Business Park Outfall 012 has been completed. Alcoa Badin Business Park Outfall 012 has a
permitted effluent discharge entering Badin Lake. Whole effluent samples were collected on
March 13 and March 15 by Roberto Scheller for use in a chronic Ceriodaphnia dubia pass -fail
toxicity test. The test passed. Toxicity test information follows.
Test Type
Test Result
Test Concentrations
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
Pass
3.8%
100%
23.3 neonates
100%
24.3 neonates
6.84 SU
276 micromhos/cm
<0.1 mg/L
7.00 SU
411 micromhos/cm
<0.1 mg/L
Test results for the above samples indicate that the effluent would not be predicted to have
water quality impacts. These samples were split and tested by ETS, Inc. The chronic
Ceriodaphnia dubia pass/fail test run by ETS, Inc. resulted in a pass. ETS ran the test at 16%,
which was the test concentration previously. A new permit was issued last fall and the new test
concentration is 3.8%. Please contact us if you have any questions or if further effluent toxicity
monitoring is desired. We may be reached at [phone].
Basin: Yadkin -Pee Dee
cc: Roberto Scheller (MRO)