NC0020591_Compliance Report_20220309

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
S. DANIEL SMITH
Director
Andy Smith
City of Statesville
Post Office Box 1111
Statesville, North Carolina 28677
Dear Mr. Smith:
NORTH CAROLINA
Environmental Quality
March 9, 2022
Subject: Toxicity Test Results
City of Statesville/Third Creek WWTP
NPDES Permit No. NC0020591
Iredell County
Enclosed is a copy of the toxicity test results relative to the samples collected (split) at the subject facility on January
25 and 27, 2022, by City of Statesville staff and Mr. Wes Bell of this Office. Effluent samples were collected for use in a
chronic Ceriodaphnia dubia pass -fail toxicity test. The test Passed utilizing these samples. Please inform the facility's
Operator -in -Responsible Charge (ORC) of our findings by forwarding a copy of the enclosed report.
Should you have any questions concerning this report, please do not hesitate to contact Mr. Bell at [phone],
or via email at [e-mail].
Enclosure: Toxicity Test Results
NORTH
Dep®rlmont of Environmental Onolit
Sincerely,
Doc uSigned by:
[,24.1.4toH Nue4
F161 FB69A2D84A3...
for
W. Corey Basinger, Regional Supervisor
Water Quality Regional Operations Section
Division of Water Resources, NCDEQ
North Carolina Department of Environmental Quality 1 Division of Water Resources
Mooresville Regional Office 1610 East Center Avenue, Suite 301 I Mooresville, North Carolina 28115
704.663.1699

DocuSign Envelope ID: 1E23DE84-BEB3-4BC2-BD55-2A804E966EAF
Division of Water Resources
February 22, 2022
MEMORANDUM
To: Corey Basinger
Water Quality Regional Operations, MRO
DS
Through: Cindy A. Moore CM
Supervisor, Aquatic • ology Branch (ATB)
From: Lorimar S. Henning btk
Environmental Specialist II, Aquatic Toxicology Branch (ATB)
Subject: Whole effluent toxicity test results
Statesville Fourth Creek WWTP
NPDES Permit # NC0031836/001
Iredell County
The aquatic toxicity test using flow -proportional composite samples of effluent discharged from the Statesville Fourth
Creek WWTP has been completed. Statesville Fourth Creek WWTP has a permitted effluent discharge of 6.0 million
gallons per day (MGD) entering Fourth Creek (7Q10 of 11.0 CFS). Whole effluent samples were collected on January 25
and January 27 by Wes Bell and facility representative Brandy Johnson for use in a chronic Ceriodaphnia dubia pass -fail
toxicity test. The test passed. Toxicity test information follows.
Test Type 3-Brood Ceriodaphnia dubia chronic pass -fail
Test Result Pass
Test Concentrations 55%
Control Survival 100%
Control Mean Reproduction 34.6 neonates
Test Treatment Survival 100%
Treatment Mean Reproduction 36.3 neonates
First Sample pH 7.38 SU
First Sample Conductivity 376 micromhos/cm
First Sample Total Residual Chlorine <0.2 mg/L
Second Sample pH 7.27 SU
Second Sample Conductivity 393 micromhos/cm
Second Sample Total Residual Chlorine <0.2 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 Meritech, Inc. The chronic Ceriodaphnia dubia pass/fail test run by Meritech,
Inc. resulted in a pass. However, the dilution used by Meritech, Inc. (i.e. 45%) was below the required limit of 55%;
therefore, the test is considered invalid and the facility has been advised to performed another test immediately. Due
this dilution discrepancy this test will not be considered a split test. Please contact us if you have any questions or if
further effluent toxicity monitoring is desired. We may be reached at [e-mail] and
[e-mail].
Basin: Yadkin -Pee Dee
cc: Wes Bell (MRO)