NC0024881_Toxicity Test Results_20200811

a
N G
ROY COOPER
Governor
MICHAEL S.REGAN ma
Secretary
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
August 11, 2020
Mr. Preston W. Mitchell, Manager
City of Reidsville
230 W. Morehead St.
Reidsville,NC 27320
Subject: Toxicity Test Results
Reidsville WWTP
NPDES Permit No. NCO024881 j
Rockingham County
Dear Mr. Mitchell:
Please find attached a copy of the toxicity test results for samples obtained of the Reidsville WWTP
effluent. Aliquots from Reidsville's composite sample were collected on July 7 and 9,2020 by Mike
Mickey and Jordan Burbage of this office for use in a chronic Ceriodaphnia dubia pass/fail toxicity
test conducted by the Division's Aquatic Toxicology Branch laboratory. The Reidsville WWTP
effluent failed the Division's test at the permitted concentration of 61%. It should be noted that the
toxicity sample was also split with Meritech Environmental Laboratories. The Meritech test resulted
in a pass.
Should you have any questions concerning this report, please do not hesitate to contact Mr. Mike
Mickey at(336) 776-9692 or at mike.mickeykncdelingov. Our office appreciates the assistance of
the WWTP staff in collecting the samples.
1
Sincerely,
on T. Snider, Regional Supervisor
Water Quality Regional Operations Section
Division of Water Resources,NCDEQ
Enclosure: Toxicity Test Results
cc: Ben Bani, ORC ([e-mail])
WSRO
I
QZ� North Carolina Department of Environmental Quality I Division of Water Resources
1;i�R Winston-Salem Regional Office 1 450 West Hanes Mill Road,Suite 3001 Winston-Salem,.North Carolina 27105
np 336.776.9800

Division of 1i1Esptirre
....
ttit 27 2020
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TfiroUBity �li%dY A Mtlorc
SOP$rvisor,Aquatir Tox(cplogy""Branch(ATB)
F fe =l on i r 5 wtenning [�,
EnvG4pme al5pecidli§tli;A PTox .# AhS T �
Sri 'u Llthole off fluent toxirrity test npsui s btt:
izetdsvilleuUt�tTp
NPI�S f efr sit Luc 4s: /6t i
Rackitigljain Courtty
Theac{uat`ptc�xi ytestusingfti,W-prgporttanaJcompos ;sarrtpiesmte luerttdisctrifrgid,Itprit
t�reBe€dllie INtN 1 F�has been eotnpieterf Rerdsaiill vYIAiTPtlaS a per4hltted efflueht"d?sehare
� .
; of 7, rriilittrrkSalfasis.perd�y(tvlGl?�entering iiaw lfiYer,(7Q of�.4i~k5); Vittipie""efffrietit '
$ampies were,eoiieeted on-lufy 7 a±tt►July 4 tiY M1itike Miek Y n t f iiit3+`r Presen#aC.ve tat'VIC tt
for usein" ,clironio"ie�odnphnindubtapass-faiftoyie�ty#esL fhetestfaEhcf. txiity`#e
anformaf"con;follovYs.,
est Typr€" 3-Broad Erioc(a�'hr .flirb�rz etr it pass-feii
Tact Result " fail.
Tes_tCbricenttations A?1
Cq rol Survival 'kUt796"
'Control I±liean ifieprodugtjon 2&4 neptiaes
Test Triatment Survival. S3.3Wo
Treatment Mean Reproopctiam 1.33 neonates
Fk9 Sample PH " 7.70 SU
First Si ple,(pnd tivity �93niierprhhosf
PirstSampteTtit lftesidualChlortne Q.p,3mill
Seeorrd Sample ply "$.; �su
Sec-rid Sampla.Gorrdnctivity mil8 m'icrprnhoslctti
SacrkaSl.S,airrple hokdl Residue l fhlorire 0,QQ
Test retsult fr?r the`atiove"saarples irrdicale that the effiiuO6f would,he"predicted to have vaster
quality in[pact . Thesesamplevu�ere split and tested Oy,MOReehrJnc. The.chronic
Gerrattdaladla dub ,pass/fail test"run,by fviaritiach resulted n�arass. fiease c€srrta usff=you
have an :�uesfiori 4eif further e{tluent_tbrNc ty menitorin!¢is dr sired> We maybe reached a"t
itl9)7Q:-840,1.
=Basin: .�a�ieFear i
0ei Mike.Mickey,(WSRO)