NC0020184_Monitoring (Report)_20230913

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Stephanie Scheringer, Division Manager
Two Rivers Utilities
Post Office Box 1748
Gastonia, NC 28053-1748
SUBJECT: Toxicity Test Results
Long Creek WWTP
NPDES Permit No. NCO020184
Gaston County
Dear Ms. Scheringer:
NORTH CAROLINA
Environmental Quality
September 13, 2023
Enclosed is a copy of the toxicity test results relative to the samples collected at the subject facility on August 22 and 24,
2023, by 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
wes.bell(kdeq.nc. gov.
Enclosure: Toxicity Test Results
Cc: DWR Laserfiche
Sincerely,
DocuSigned by:
A wNNuft
F161 F669A2D84A3...
Andrew H. Pitner, P.G.
Regional Supervisor
Water Quality Regional Operations Section
Mooresville Regional Office
Division of Water Resources, NCDEQ
D North Carolina Department of Environmental Quality I Division of Water Resources
Mooresville Regional Office 1 610 East Center Avenue, Suite 301 1 Mooresville, North Carolina 28115
704.663.1699

DocuSign Envelope ID: F1CA126A-CE37-47B9-B6D6-OD5841ABC498
pEQ�I�� DWR
Division of Wt., Resources
September 1, 2023
MEMORANDUM
To: Andrew Pitner
Water Quality Regional Operations, MRO
Through: Cindy A. Moore
Supervisor, Aquatic Toxicology Branch (ATB)
From: Madison E. Myers
Environmental Specialist II, Aquatic Toxicology Branch (ATB)
Subject: Whole effluent toxicity test results
Long Creek WWTP
NPDES Permit # NCO020184/001
Gaston County
The aquatic toxicity test using flow -proportional composite samples of effluent discharged from
the Long Creek WWTP has been completed. Long Creek WWTP has a permitted effluent
discharge of 16.0 million gallons per day (MGD) entering South Fork Catawba River (7Q10 of 109
CFS). Whole effluent samples were collected on August 22 and August 24 by Wes Bell 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 19%
Control Survival 100%
Control Mean Reproduction 26.4 neonates
Test Treatment Survival 91.7%
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
26.8 neonates
7.54 SU
401 micromhos/cm
<0.1 mg/L
7.70 SU
444 micromhos/cm
0.24 mg/L
Test results for the above samples indicate that the effluent would not be predicted to have
water quality impacts. Please contact us if you have any questions or if further effluent toxicity
monitoring is desired. We may be reached at [e-mail] or
[e-mail].
Basin: Catawba
cc: Wes Bell (MRO)