HomeMy WebLinkAboutNC0074756_Split Tox Sample_20221026DocuSign Envelope ID: A121C5DF-C367-4727-BDBC-551600570951
October 26, 2022
MEMORANDUM
DWR
Division of Water Resources
To: Andrew Pitner
Water Quality Regional Operations, MRO
DS
Through: Cindy A. Moore ram -
Supervisor, Aquatic Toxicology Branch (ATB)
DS
From: Madison E. MyersFM
Environmental Specialist I, Aquatic Toxicology Branch (ATB)
Subject: Whole effluent toxicity test results
Greater Badin Water & Sewer District
NPDES Permit # NC0074756/001
Stanly County
The aquatic toxicity test using flow -proportional composite samples of effluent discharged from
the Greater Badin Water & Sewer District has been completed. Greater Badin Water & Sewer
District has a permitted effluent discharge of 0.55 million gallons per day (MGD) entering Little
Mountain Creek (7Q10 of 0.26 CFS). Whole effluent samples were collected on October 11 and
October 13 by Roberto Scheller for use in a chronic Ceriodaphnia dubia pass -fail toxicity test.
The test passed. Toxicity test information follows.
Test Type
Test Result
Test Concentrations
Control Survival
Control Mean Reproduction
Test Treatment Survival
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
3-Brood Ceriodaphnia dubia chronic pass -fail
Pass
83.4%
100%
16.08 neonates
100%
11.08 neonates
7.50 SU
297 micromhos/cm
<0.1 mg/L
7.56 SU
295 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 Meritech. The chronic
Ceriodaphnia dubia pass/fail test run by Meritech 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
cindy.a.moore@ncdenr.gov and madison.myers@ncdenr.gov.
Basin: Yadkin -Pee Dee
cc: Roberto Scheller (MRO)