NC0020931_Toxicity Test Results_20210324

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
Mr. Vaughn Benton, Mayor
Town of Boonville
P.O. Box 326
Boonville, NC 27011
Dear Mayor Benton:
NORTH CAROLINA
Environmental Quality
March 24, 2021
Subject: Toxicity Test Results
Boonville WWTP
NPDES Permit No. NCO020931
Yadkin County
Please find attached a copy of the toxicity test results for samples obtained from the Boonville
wastewater treatment plant effluent. Aliquots from Boonville's composite samples were collected
on February 23 and 25, 2021 by Mike Mickey of this office for use in a chronic Ceriodaphnia dubia
pass/fail toxicity test conducted by the Division's Aquatic Toxicology Branch laboratory. The
Boonville WWTP effluent (passed) this test at the permitted effluent concentration of 81%. The test
treatment survival rate was 100%.
Should you have any questions concerning this report, please do not hesitate to contact Mike Mickey
at [phone]. Our office appreciates the assistance of the WWTP staff in collecting the samples.
Sincerely,
DocuSigned by:
OD2D3CE3F167456...
Jennifer F. Graznak, Assistant Regional Supervisor
Water Quality Regional Operations Section
Division of Water Resources, NCDEQ
Enclosure: Toxicity Test Results
cc: Jeff Jones Oeff [e-mail])
WSRO
D � North Carolina Department of Environmental Quality I Division of Water Resources
Winston-Salem Regional Office [ 450 West Hanes Mill Road, Suite 300 I Winston-Salem, North Carolina 27105
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DocuSign Envelope ID: D5D85829-5FEC-41BA-BFB3-068688B2AC98
Division of Water Resources
March 18, 2021
MEMORANDUM
To: Jenny Graznak
Water Quality Regional Operations, WSRO
DS
Through: Cindy A. Moor CM
Supervisor, Aquatic o iicology Branch (ATB)
From: Lorimar S. Hennin L11,
Environmental SpAquatic Toxicology Branch (ATB)
Subject: Whole effluent toxicity test results
Boonville WWTP
NPDES Permit # NCO020931/001
Yadkin County
The aquatic toxicity test using flow -proportional composite samples of effluent discharged from
the Boonville WWTP has been completed. Boonville WWTP has a permitted effluent discharge
of 0.2 million gallons per day (MGD) entering Tanyard Creek (7Q10 of 0.075 CFS). Whole
effluent samples were collected on February 23 and February 25 by Mike Mickey and facility
representative Jeff Jones 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 81%
Control Survival 100%
Control Mean Reproduction 29.8 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
30.6 neonates
7.11 SU
364 micromhos/cm
0.06 mg/L
7.03 SU
393 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. Please contact us if you have any questions or if further effluent toxicity
monitoring is desired. We may be reached at [phone].
Basin: Yadkin -Pee Dee
cc: Mike Mickey (WSRO)