NC0082949_Technical Correction_20140414

NPDES DOCIMENT SCANNIN' COVRP St'IRRT
NPDES
Permit:
NC0082949
Denton WTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
4echnical Correction
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
April 14, 2014
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ATA
NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory John E. Skvarla, III
Governor Secretary
April 14, 2014
Mr. Tammie B. Melton, WTP Superintendent
Town of Denton
P.O. Box 306
Denton, North Carolina 27239
Subject: Change -Page to Correct Error
NPDES Permit NC0082949
Denton Water Treatment Plant (WTP)
Davidson County
Dear Ms. Melton:
The Division of Water Resources (the Division) noticed an error in your recently issued permit (March 14,
2014). We inadvertently switched sampling months for Whole Effluent Toxicity, inconsistent with your
previous permit.
Accordingly, we hereby forward the modified permit pages reinstating the testing months to February,
May, August and November in Section A. (1.) Footnote 6 and in Section A. (2.). Please insert these
change pages into your existing permit and discard the old pages. We regret any inconvenience this causes
your organization.
Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to
obtain other permits which may be required by the Division of Water Resources or permits required by the
Division of Energy, Mineral and Land Resources, the Coastal Area Management Act or any other Federal or
Local governmental permit that may be required.
If you have questions, or if we can be of further service, please contact Derek Denard at
[[e-mail]] or call [phone].
12L
Thomas A. Reeder, Dire
Division of Water Resources, NCDENR
Enclosure: NPDES Permit NC0088897 (Corrected Page)
hc: Central Files
NPDES Program Files
WSRO Files/ Attn: Corey Basinger
ec: ESS/Aquatic Toxicology Unit, Susan Meadows [[e-mail]]
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Phone: [phone] Internet: www.ncwaterquality.org
An Equal Opportunity \ Affirmative Action Employer— Made in part by recycled paper

NPDES Permit NC0082949
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized to discharge filter backwash via Outfall 001. Such discharges shall be limited and monitored' by the
Permittee as specified below:
4
:,•
y
'ER �CO Es'J
,
,LIMITS .
l Ol OBJNG R1 UmtEMENTS1
1 �
fi pnthly '
Average;
. 1
� Daily " ,
Maximum `
'wi 1
IMe su�"i e�nei t
.Frequency'
' - ample `
- 'ype.
Sa! e•
1 Locatlo
Flow (MGD)
50050
Weekly
Instantaneo 2
or Estimate
Effluent
Total Suspended Solids (mg/L)
C0530
30.0 mg/L
45.0 mg/L
2/month
Grab
Effluent
Turbidity (NTU)
00070
2/month
Grab
Effluent
Total Residual Chlorine 3 (pg/L)
50060
17 tig L 3
2/month
Grab
Effluent
pH (su)
00400
Not < 6.0 or > 9.0
standard units
2/month
Grab
Effluent
Total Aluminum 4 (mg/L)
01105
8.0 mg/L 4
Monthly
Grab
Effluent
Total Manganese 4
(mg/L)
01055
0.2 mg/L4
Monthly
Grab
Effluent
5 'I
Total Fluoride {mg/L)
00951
QuarterlyGrab
Effluent
Total Zinc 5 (mg/L)
01092
Quarterly
Grab
Effluent
Total Copper 5 (mg/L)
01042
Quarterly
Grab
Effluent
Total Iron 5 (mg/L)
01045
Quarterly
Grab
Effluent
n 6
Chronic WET Testing
TGP3B
uarterl
Q Y
Grab
Effluent
Footnotes:
1. No later January 26, 2015 begin submitting discharge monitoring reports electronically using NC DWR's
eDMR application system. See Special Condition A. (3.).
2. For instantaneous flow monitoring, the duration of the discharge must be reported in addition to the
total flow.
3. The Division shall consider TRC effluent values reported below 50 µg/L to be compliant with the
permit. However, the Permittee shall continue to record and submit all values reported by a North
Carolina -certified laboratory method (including field certified), even if these values fall below 50µg/L.
4. Compliance with this limit shall commence on May 1, 2018, approximately 48 months from the permit
effective date.
5. Samples shall be collected concurrently with WET -test samples.
6. Whole Effluent Toxicity (WET) testing - testing of Ceriodaphnia dubia shall be performed as 7-day pass/fail
test at 90% effluent concentration, during February, May, August and November [See A. (2.)].
Comments:
Samples shall be taken at the outfall but prior to mixing with the receiving waters.
There shall be no discharge of floating solids or foam in other than trace amounts.
Page 3 of 7

NPDES Permit NC0082949 •
A. (2.) CHRONIC TOXICITY PASS/FAIL MONITORING (QUARTERLY)
The permittee shall conduct quarterly chronic toxicity tests using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or subsequent
versions.
The effluent concentration defined as treatment two in the procedure document is 90%. The testing shall
be performed as a Ceriodaphnia dubia 7-day pass/fail test. The tests will be performed during the
months of February, May, August and November. These months signify the first month of each
three month toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be
obtained during representative effluent discharge and shall be performed at the NPDES permitted final
effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter code
TGP3B. Additionally, DWR Form AT-1 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Environmental Sciences Section
1621 Mail Service Center
Raleigh, N.C. 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no later
than 30 days after the end of the reporting period for which the report is made.
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual chlorine
of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of
the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the report
with the notation of "No Flow" in the comment area of the form. The report shall be submitted to the
Environmental Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then
monthly monitoring will begin immediately. Upon submission of a valid test, this monthly test
requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
If the Permittee monitors any pollutant more frequently than required by this permit, the results of such
monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT
Forms submitted.
Page 4 of 7

Denard, Derek
0_ rev-eocc
I/.ehvf ph L 1r
From: Meadows, Susan
Sent: Monday, March 24, 2014 11:13 AM
To: Denard, Derek
Subject: RE: Final Yadkinville WTP NC0079260
jJ COO R7_ qt-le‘
Ok, yes you are right. I thought there were two I had come across that you had done but, I think It as someone else's.
Thanks.
Susie
Susan Meadows, Environmental Biologist
Aquatic Toxicology Branch
DWR/Water Sciences Section
4401 Reedy Creek Road Raleigh, NC 27607
[e-mail]
tel: [phone]
fax: [phone]
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Denard, Derek
Sent: Monday, March 24, 2014 11:08 AM
To: Meadows, Susan
Subject: RE: Final Yadkinville WTP NC0079260
Susie,
Ok Thanks. Yadkinville did not change from the previous permit is that right? However, Denton WTP did change, I didn't
catch this before it went out, so I will have to issue a correction. I believe that was the only final that I missed this on. I
will look at my Drafts and make changes. Please let me know if you see this again. Thanks.
Derek
From: Meadows, Susan
Sent: Monday, March 24, 2014 10:31 AM
To: Denard, Derek
Subject: RE: Final Yadkinville WTP NC0079260
Hi Derek,
I've noticed in some of these existing permits the testing Months have been changed.
We usually do not like to do that unless there is a specific reason to do so.
It only leads to confusion with the facilities and certified labs, as they set up ongoing testing schedules.
Please keep that in mind in the future.
Thanks.
Susie
1

Susan Meadows, Environmental Biologist
Aquatic Toxicology Branch
DWR/Water Sciences Section
4401 Reedy Creek Road Raleigh, NC 27607
susan.meadows@ncdenr.l;ov
tel: [phone]
fax: [phone]
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Denard, Derek
Sent: Monday, March 17, 2014 3:36 PM
To: Meadows, Susan
Subject: Final Yadkinville WTP NC0079260
Please find an attached final Draft for the subject permit NC0079260 Yadkinville WTP.
Derek C Denard
Er' ronmerle! Saeearst
NCDENR Division of Water Re-=c .rces
Water Q•aarrty PenTatto; Section
Wastewater Branch
CompF.ance & EKoedted Permitting Una
(919) 807-630i7
[e-mail]
1;17 #Aa3 ianeca Canter, Aaugh, T,C 27 94-1517
httv.A/pertaincdxi norg;l..a:; tifrw;.,/y;'n
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
2