NC0021181_CBI_20180424

Environmental
Quality
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Interim Director
April 24, 2018
Mr. Adrian Miller, City Manager
City of Belmont
P.O. Box 431
Belmont, NC 28012
Subject: Bioassay results
Belmont WWTP
NPDES Permit No. NCO021181
Gaston County
Dear Mr. Miller:
Enclosed is a copy of the Bioassay results taken during for the inspection conducted at the subject
facility on February 15, 2018, by Maria Schutte and Ori Tuvia. The sampling results revealed that
the facility passed the Whole Effluent Toxicity test (see attached results). Please inform the
facility's Operator -in -Responsible Charge (ORC) of our findings by forwarding a copy of the
enclosed report.
If you any questions, please contact On Tuvia at [phone], or via email at
ori.tuviagncderin gov.
Sincerely,
DocuSigned by:
A14CC681AF27425...
W. Corey Basinger
Regional Supervisor
Mooresville Regional Office
Division of Water Resources
Cc: NPDES, MRO Files (Laserfiche)
Mooresville Regional Office
Location: 610 East Center Ave., Suite 301 Mooresville, NC 28115
Phone: [phone] Fax: [phone] Customer Service: 1-877-623-6748
Internet: www.ncwaterquality.org

Division of Water Resources
March 8, 2018
MEMORANDUM
To: Corey Basinger
Water Quality Regional Operations, MRO
Through: Cindy A. Moore
Supervisor, Aquatic Toxicology Branch (ATB)
From: Carol Hollenkamp
Quality Assurance Officer, Aquatic Toxicology Branch (ATB)
Subject: Whole effluent toxicity test results
Belmont WWTP
NPDES Permit # NCO021181/001
Gaston County
The aquatic toxicity test using flow -proportional composite samples of effluent discharged from
Belmont WWTP has been completed. Belmont WWTP has a permitted effluent discharge of 5.0
million gallons per day (MGD) entering the Catawba River (7Q10 of 95.0 CFS). Whole effluent
samples were collected on February 13 and February 15 by Ori Tuvia and facility representative
Tanya Setzer 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
8%
Control Survival
92%
Control Mean Reproduction
24 neonates
Test Treatment Survival
100%
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
32.5 neonates
7.01 SU
673 micromhos/cm
<0.1 mg/L
7.26 SU
1144 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 ETT. The chronic Ceriodaphnia
dubia pass/fail test run by ETT 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 [phone].
Basin: Catawba
cc: Ori Tuvia (MRO)