NC0024252_Monitoring (Information)_20220726

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Brain Bradshaw
City of Conover
Post Office Box 549
Conover, NC 28613
SUBJECT: Toxicity Test Results
Conover Northeast WWTP
NPDES Permit No. NC0024252
Catawba County
Dear Mr. Bradshaw:
NORTH CAROLINA
Environmental Quality
July 26, 2022
Enclosed is a copy of the toxicity test results relative to the samples collected at the subject facility on June 7 and 9, 2022,
by City of Conover 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 the enclosed report.
Should you have any questions concerning this report, please do not hesitate to contact Mr. Bell at [phone] or at
[e-mail].
Enclosure:
Toxicity Test Results
Cc: DWR Laserfiche
DILLORIN
_E
Sincerely,
DocuSigned by:
14.141.4v ii P4#44.fo r
F161 FB69A2D84A3...
W. Corey Basinger, Regional Supervisor
Water Quality Regional Operations Section
Mooresville Regional Office
Division of Water Resources, NCDEQ
North Carolina Department of Environmental Quality I Division of Water Resources
Mooresville Regional Office 1610 East Center Avenue. Suite 301 1 Mooresville. North Carolina 28115
704.663.1699

DocuSign Envelope ID: 9BE1648A-A401-41 EF-97D5-9C40996C2D32
DWR
Division of Water Resources
July 7, 2022
MEMORANDUM
To: Corey Basinger
Water Quality Re • 98, I Operations, MRO
Through: Cindy A. Moore OM-
Supervisor, Aquaticology Branch (ATB)
From: Lorimar S. Henning
Environmental Specialist II, Aquatic Toxicology Branch (ATB)
Subject: Whole effluent toxicity test results
Conover NE WWTP
NPDES Permit # NC0024252/001
Catawba County
The aquatic toxicity test using constant time/constant volume samples of effluent discharged
from the Conover NE WWTP has been completed. Conover NE WWTP has a permitted effluent
discharge of 1.5 million gallons per day (MGD) entering Lyle Creek (7Q10 of 5.0 CFS). Whole
effluent samples were collected on June 7 and June 9 by Wes Bell and facility representative
William Huffman 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 32%
Control Survival 100%
Control Mean Reproduction 33.8 neonates
Test Treatment Survival 100%
Treatment Mean Reproduction 32.0 neonates
First Sample pH 7.77 SU
First Sample Conductivity 525 micromhos/cm
First Sample Total Residual Chlorine <0.2 mg/L
Second Sample pH 7.84 SU
Second Sample Conductivity 529 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. Please contact us if
you have any questions or if further effluent toxicity monitoring is desired. We may be reached
at [e-mail].
Basin: Catawba
cc: Wes Bell (MRO)