NC0044440_Bioassay Compliance Inspection_20170111

ROY COOPER
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Water Resources
ENVIrRONMCN1AL QUALITY
January 11, 2017
RECEIVEDINCDEQIDVVR
Mr. Ben Blackburn, City Manager
City of Cherryville JAN 17 2017
116 South Mountain Street Water Quality
Cherryville, NC 28021 Permitting Section
Subject: Bioassay Compliance Inspection
City of Cherryville WWTP
NPDES Permit No. NC0044440
Gaston County
Dear Mr. Blackburn:
Enclosed is a copy of the laboratory results for the effluent samples collected during the
Bioassay Compliance Inspection performed at the subject facility on December 7, 2016 by 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.
Should you have any questions concerning this report, please do not hesitate to contact
Ori Tuvia at [phone], or at [e-mail].
Sincerely,
Ori Tuvia, Environmental Engineer
Mooresville Regional Office
Division of Water Resources, DEQ
Enclosures:
Sample Results -
Cc: NPDES Unit
MRO Files
Gaston County Health Department
Mooresville Regional Office
Location:610 East Center Ave.,Suite 301 Mooresville,NG 28115
Phone:[phone] Fax:[phone] Customer Service:1-877-623-6748

Division of Water Resources
January 10, 2017
MEMORANDUM
To: Corey Basinger 0
Water Quality Regional Operations, MRO
Through: Cindy A. Moore ak,
Supervisor,Aquatic T xicology Branch (ATB).
From: Carol Hollenkamp
• Quality Assurance Officer,Aquatic Toxicology Branch (ATB)
Subject: Whole effluent toxicity test results
Cherryville WWTP
NPDES Permit#NC0044440/001
Gaston County
•
The aquatic toxicitytest using flow-proportional composite samples of effluent discharged from
the Cherryville WWTP has been completed. Cherryville WWTP has a permitted effluent discharge
• of 2 million gallons per day(MGD) entering Indian Creek(7Q10 of 6.1 CFS). Whole effluent
samples were collected on December 6 and December 8 by Ori Tuvia and facility representative
Chris Heedick 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 Concentrations 34%
Control Mean Reproduction • 27.9 neonates
Test Treatment Survival • 100%
• Treatment Mean Reproduction 28.4 neonates • -
First Sample pH 6.56 SU
First Sample Conductivity 391 micromhos/cm
First Sample Total Residual.Chlorine <0.1 mg/L
Second Sample pH 6.34 SU
Second Sample Conductivity 367 micromhos/cm
Second Sample Total Residual Chlorine <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 Meritech,Inc.The chronic Ceriodaphnia
dubia pass/fail toxicity test run by Meritech, Inc. also resulted in a pass. Please contact us if you 0 .
have any questions or if further effluent toxicity monitoring is desired. We may be reached at(919) • • -
743-8401.
Basin: CTB35
cc: Central FilesO 0
Ori Tuvia (MRO)