NC0082949_Fact Sheet_20200121

FACT SHEET FOR EXPEDITED PERMIT RENEWALS
This form must be completed by Permit Writers for all expedited permits which do not require
full Fact Sheets. Expedited permits are generally simple 100% domestics (e.g., schools, mobile
home parks, etc) that can be administratively renewed with minor changes, but can include
facilities with more complex issues (Special Conditions, 303(d) listed water, toxicity testing,
instream monitoring, compliance concerns).
Basic Information for Expedited Permit Renewals
Permit Writer / Date
Brianna Young 1/21/2020
Permit Number
NCO082949
Facility Name / Facility Class
Denton WTP / PC-1
Basin Name / Sub -basin number
Yadkin Pee -Dee / 03-07-08
Receiving Stream / HUC
UT to Yadkin River / 0304010306
Stream Classification / Stream Segment
WS-IV, B; CA / 12- 124.5
Does permit need Daily Maximum NH3
limits?
N/A
Does permit need TRC limits/language?
Alread resent
Does permit have toxicity testing? IWC (%) if
so
Yes; IWC = 90%
Does permit have Special Conditions?
No
Does permit have instream monitoring?
Yes — added hardness monitoring
Is the stream impaired (on 303(d) list)?
No (impaired just upstream at High Rock
Dam for chlorophyll -a and PCB fish tissue
advisory)
Any obvious compliance concerns?
Yes — see below
Any permit mods since lastpermit?
None
New expiration date
1/31/2024
Comments on Draft Permit?
Yes — see below
Facility Overview:
The Town of Denton operates a conventional WTP designed for a potable flowrate of
2.25 MGD. The facility generates intermittent discharge with approximately 90% of the
wastewater coming from the sedimentation basins, and approximately 10% coming from
backwashing the sand filters. Raw water treatment consists of additions of powder
activated carbon and potassium permanganate, alum during flash mixing, caustic soda,
sedimentation basin, chlorine added in the sand filters, additions of fluoride, chlorine,
corrosion inhibitor, and caustic soda before the clear well and out to the distribution
system.
The facility has the potential to discharge the following chemicals:
• Alum/aluminum sulfate
• Caustic soda
• Orthopolyphosphate blend
• Potassium permanganate

Compliance History (October 2014 to October 2019):
• 1 NOD for aluminum exceedance
• 2 NOVs for aluminum frequency violations
• 3 NOVs for late/missing DMRs
• Failed 2 of last 12 toxicity tests (passed last 10)
The Town of Denton discharges consistently and has required quarterly monitoring for
several parameters with specified months, but reporting during the previous permit cycle
was not done consistently, and violations were not being generated in BIMS. See related
discussion with Winston Salem Regional Office in factsheet section below regarding
comments on draft permit.
RPA:
The maximum monthly average discharge between October 2016 and September 2019
was approximately 0.0342 MGD.
• Copper: RP shown; Monthly monitoring with limits will be applied
• Fluoride: No RP; Predicted max < 50% of allowable Cw; Quarterly monitoring
will remain as fluoride is used in potable water treatment
• Zinc: No RP; Predicted max < 50% of allowable Cw; Monitoring no longer
required
NCG59 General Permit Eligibility:
• Limits added for copper, therefore they are not eligible
• Conclusion: They are not eligible for the NCG59
Changes from previous permit to draft:
• Updated outfall map
• Language on the Supplement to Permit Cover Sheet has been updated
• Components list updated on Supplement to Permit Cover sheet to reflect renewal
application
• Units of measure updated in A(1)
• Monitoring for flow reduced to 2/month in A(1) per 2009 WTP strategy
• Turbidity monitoring reduced to monthly in A(1) per 2009 WTP strategy and
2012 WTP guidance update
• Limit for aluminum removed and monitoring reduced to quarterly in A(1) as there
is no longer an RPA necessary for aluminum per 2012 WTP guidance; quarterly
monitoring maintained as alum/aluminum phosphate has the potential to be
discharged
• Monitoring for manganese reduced in A(1) to quarterly as there is no water
quality standard for manganese but it is a pollutant of concern as discharge is into
WS-class waters per 2012 WTP guidance

• Limits added for copper in A(1) and monitoring frequency increased to monthly
per RPA
o Compliance schedule added as A(3)
• Monitoring for iron removed in A(1) as there is no longer a water quality standard
for iron, was monitor only in previous permit, and renewal application indicates
iron sulfate/ferrous sulfate does not have the potential to be discharge
• Monitoring for zinc has been removed in A(1) per 2009 WTP strategy as the
application indicates zinc orthophosphate does not have the potential to be
discharged, and RPA shows no reasonable potential to exceed WQS
• Hardness monitoring added in A(1) per current WTP guidance
• Flow footnote updated in A(1) per 2012 WTP guidance update
• Removed former footnote #4 in A(1) stating "Samples shall be collected
concurrently with WET -test samples" as this is no longer required per the 2012
WTP guidance update
Changes from draft to final:
• Added missing units and parameter code for fluoride in A(1)
• Hardness footnote in A(1) updated to reflect only parameters for which
monitoring is currently required
• Per WSRO request, the compliance footnote in A(1) for total copper has been
updated to clarify that monthly monitoring is required for the duration of the
compliance schedule and permit
• Regional office mailing address corrected in A(3)
Comments received on draft permit:
Email to WSRO 10/18/19:
• Per the current permit, monthly monitoring is required for aluminum and
manganese, and quarterly monitoring is required for fluoride, zinc, copper, and
iron. During review of the data, DWR is missing DMR data for the following:
o Aluminum, iron, manganese, copper, and fluoride from November 2014 to
April 2016
o Zinc between December 2014 and April 2016
o Aluminum, iron, manganese, copper, fluoride, and zinc for all of 2017
except January and May
o Copper, fluoride, iron, and zinc for all of 2019 except August 2019
• After reaching out to Heather Hicks to try and obtain the missing parameter data,
she sent lab data sheets that she informed was everything. Based on this, it looks
like there are a lot of missed sampling events for the facility. In addition, based on
the lab data sheets, some of the monitoring that was done was not submitted.
• BIMS does not contain any violations for the missing monitoring data, which is a
known problem for quarterly monitoring requirements. After speaking with DWR
staff, the question has come up on whether NOVs needs to be issued for all the
missing data. Is WSRO aware of any reason why the monitoring data may be
missing, and if not, should NOVs be issued for the missing data?

Regional office responses to email:
• Paul DiMatteo (via email 10/18/19): I did note the issues with manganese and
aluminum sometime last year, and the response I got back from Charles basically
said that some language should have been included in the permit to specify that
monitoring was required even though the parameters were not limited until some
time after the permit was issued, implying that it may have been understandable
that they didn't think to sample for it until then. So we let the missed sampling
until the time the permit limit came into effect go. As far as the other parameters,
I can't say what happened. It seems that BIMS has not flagged any violations of
these parameters. That might explain why the violations have gone unnoticed. I
will schedule an inspection with them and verify these things.
• Jenny Graznak (via email 10/18/19): I think our main priority should be trying
to figure out why BIMS did not flag those violations and also why the facility did
not sample according to their permit requirements. Those issues need to be
addressed and then we should probably document the issue, with either a Notice
or a letter to the permittee.
• DWR response (via email 10/22/19): In regards to BIMS, Charles previously
mentioned the lack of violations for nonreporting of quarterly monitoring is a
known BIMS problem, and it does not sound like there is anything we can change
about it.
Email from Paul DiMatteo (WSRO 11/6/19): I just got back from my inspection. We'll
discuss what to do about the missing and incorrectly entered data in house but in the
meantime I thought I'd touch base with you.
• Heather said she sent you copies of all the lab sheets from the past 5 years. Is that
available on the S drive so that I could see it? There were a number of data entry
issues and I'd like to go through as many DMRs as I can to verify.
o DWR response: The data was sent to the WSRO.
• Some of the data that was omitted from the DMRs I have was actually metals
data.
o DWR response: See above.
• Do you have the toxicity results in the DMR? For all the data I looked at on site,
they did do quarterly toxicity sampling but didn't correctly report the result in the
DMR.
o DWR response: The tox results were pulled from the summary document
ATB sends out every month. Denton has been sending the results in to
them, but it looks like BIMS may not have been capturing the data.
• For Manganese, at some point the reported unit was changed from mg/1 to ug/l.
This is a mistake. No conversions were made.
o DWR response: Manganese no longer has an 02B standard, so no RPA is
run on it. It will still require monitoring in the new permit and will have
units of ug/L. If they reported data in the wrong units, they will need to
submit corrected DMRs.
• After verifying what data is actually missing, would you need additional metals
data? They were wondering if they should do additional monitoring for a few
months to try to make up for it.
o DWR response: They are welcome to submit whatever data they would
like for review. They don't need to "make up" for missed monitoring, but

the biggest thing right now is getting them to sample at the frequencies
required by their permit. At this point, they will be getting limits for
copper based on the RPA. Getting 5 consecutive days of effluent and
upstream hardness data may help them.
Jenny Graznak and Paul DiMatteo (WSRO, via email 12/12/19)
• I don't see where they define the upstream sampling location. Usually it says
explicitly. Maybe the bridge at Bringle Ferry Road? Or it looks like there's a boat
ramp right there?
o DWR response: The upstream location would need to be upstream of the
discharge point. The wastewater currently discharges into an unnamed
tributary. Is the regional office aware of a location in the unnamed
tributary upstream of the discharge location that the Town can sample at?
If there is no upstream location (i.e. if the discharge is the start of the UT),
then upstream hardness sampling can be removed.
• Maybe they should explicitly state as a footnote that monthly copper monitoring
is required while the compliance schedule is in effect.
o DWR response: This is not normally done as monitoring is always
required, the compliance schedule only relates to the implementation of
limits. However, given the facility's history of not monitoring as the
permit requires, the required monthly monitoring will be clarified in the
footnote.
• I don't see that they included an expected unit for total fluoride, but they have one
for all the other parameters.
o DWR response: Thank you for pointing this out. The units have been
added.
NPDES Implementation of Instream Dissolved Metals Standards — Freshwater
Standards:
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by
the NC Environmental Management Commission (EMC) on November 13, 2014. The US
EPA subsequently approved the WQS revisions on April 6, 2016, with some exceptions.
Therefore, metal limits in draft permits out to public notice after April 6, 2016 must be
calculated to protect the new standards - as approved.
Table 1. NC Dissolved Metals Water Quality Standards/Aquatic Life Protection
Parameter
Acute FW, µg/l
(Dissolved)
Chronic FW,
µg/1
(Dissolved)
Acute SW, µg/l
(Dissolved)
Chronic SW,
µg/1
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1

Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form.
Aquatic life standards for Mercury and selenium are still expressed as Total
Recoverable Metals due to bioaccumulative concerns (as are all human health
standards for all metals). It is still necessary to evaluate total recoverable aquatic
life and human health standards listed in 15A NCAC 213.0200 (e.g., arsenic at 10
µg/1 for human health protection; cyanide at 5 µg/L and fluoride at 1.8 mg/L for
aquatic life protection).
Table 2. Dissolved Freshwater Standards for Hardness -Dependent Metals
The Water Effects Ratio (WER) is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Subparagraph (11)(d)
Metal
NC Dissolved Standard, /l
Cadmium, Acute
WER* {1.136672-[ln hardness] (0.041838)} e^10.9151 [ln
hardness] -3.1485 }
Cadmium, Acute Trout
waters
WER* { 1.136672-[ln hardness] (0.041838)} e^{0.9151 [In
hardness] -3.62361
Cadmium, Chronic
WER*{L101672-[ln hardness] (0.041838)} eA10.7998[ln
hardness] -4.4451 }
Chromium III, Acute
WER*0.316 • e^{0.8190[ln hardness] +3.725 61
Chromium III, Chronic
WER*0.860 eA10.8190[ln hardness] +0. 68481
Copper, Acute
WER*0.960 eA10.9422[ln hardness]-1.7001
Copper, Chronic
WER*0.960 e^{0.8545[ln hardness]-1.702}
Lead, Acute
WER* { 1.46203-[ln hardness](0.145712)} • e^ { 1.273 [ln hardness]-
1.460}
Lead, Chronic
WER* { 1.46203-[ln hardness](0.145712)} • e^ { 1.273 [ln hardness]-
4.705 }
Nickel, Acute
WER*0.998 eA10.8460[ln hardness] +2.25 51
Nickel, Chronic
WER*0.997 e^{0.8460[ln hardness] +0. 05 841
Silver, Acute
WER*0.85 • e^{1.72[ln hardness]-6.59}
Silver, Chronic
Not applicable

Zinc, Acute
WER*0.978 e^{0.8473[ln hardness] +0. 8 841
Zinc, Chronic
WER*0.986 e^{0.8473[ln hardness] +0. 8 841
General Information on the Reasonable Potential Analysis (RPA)
The RPA process itself did not change as the result of the new metals standards.
However, application of the dissolved and hardness -dependent standards requires
additional consideration in order to establish the numeric standard for each metal of
concern of each individual discharge.
The hardness -based standards require some knowledge of the effluent and instream
(upstream) hardness and so must be calculated case -by -case for each discharge.
Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR
122.45(c). The discharge -specific standards must be converted to the equivalent total
values for use in the RPA calculations. We will generally rely on default translator values
developed for each metal (more on that below), but it is also possible to consider case -
specific translators developed in accordance with established methodology.
RPA Permitting Guidance/WQBELs for Hardness -Dependent Metals — Freshwater:
The RPA is designed to predict the maximum likely effluent concentrations for each
metal of concern, based on recent effluent data, and calculate the allowable effluent
concentrations, based on applicable standards and the critical low -flow values for the
receiving stream.
If the maximum predicted value is greater than the maximum allowed value (chronic or
acute), the discharge has reasonable potential to exceed the standard, which warrants a
permit limit in most cases. If monitoring for a particular pollutant indicates that the
pollutant is not present (i.e. consistently below detection level), then the Division may
remove the monitoring requirement in the reissued permit.
To perform a RPA on the Freshwater hardness -dependent metals the Permit
Writer compiles the following information:
• Critical low flow of the receiving stream, 7Q10 (the spreadsheet
automatically calculates the 1 Q 10 using the formula 1 Q 10 = 0.843
(s7Q I0, CfS) 0.993
• Effluent hardness and upstream hardness, site -specific data is preferred
• Permitted flow
• Receiving stream classification
2. In order to establish the numeric standard for each hardness -dependent metal of
concern and for each individual discharge, the Permit Writer must first determine
what effluent and instream (upstream) hardness values to use in the equations.
The permit writer reviews DMR's, Effluent Pollutant Scans, and Toxicity Test
results for any hardness data and contacts the Permittee to see if any additional
data is available for instream hardness values, upstream of the discharge.

If no hardness data is available, the permit writer may choose to do an initial
evaluation using a default hardness of 25 mg/L (CaCO3 or (Ca + Mg)). Minimum
and maximum limits on the hardness value used for water quality calculations are
25 mg/L and 400 mg/L, respectively.
If the use of a default hardness value results in a hardness -dependent metal
showing reasonable potential, the permit writer contacts the Permittee and
requests 5 site -specific effluent and upstream hardness samples over a period of
one week. The RPA is rerun using the new data.
The overall hardness value used in the water quality calculations is calculated as
follows:
Combined Hardness (chronic)
_ (Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) x (s7Q10, cfs *Avg. Upstream Hardness,
MZU
(Permitted Flow, cfs + s7Q10, cfs)
The Combined Hardness for acute is the same but the calculation uses the 1Q10
flow.
The permit writer converts the numeric standard for each metal of concern to a
total recoverable metal, using the EPA Default Partition Coefficients (DPCs) or
site -specific translators, if any have been developed using federally approved
methodology.
EPA default partition coefficients or the "Fraction Dissolved" converts the
value for dissolved metal at laboratory conditions to total recoverable metal
at in -stream ambient conditions. This factor is calculated using the linear
partition coefficients found in The Metals Translator: Guidance for
Calculating a Total Recoverable Permit Limit from a Dissolved Criterion
(EPA 823-B-96-007, June 1996) and the equation:
Cdiss = I
Ctotal I + i [Kpo] [SS(I+a)] [10-6]
Where:
ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L
used, and
Kpo and a = constants that express the equilibrium relationship between
dissolved and adsorbed forms of metals. A list of constants used for each
hardness -dependent metal can also be found in the RPA program under a
4. The numeric standard for each metal of concern is divided by the default partition
coefficient (or site -specific translator) to obtain a Total Recoverable Metal at
ambient conditions.

In some cases, where an EPA default partition coefficient translator does not exist
(ie. silver), the dissolved numeric standard for each metal of concern is divided by
the EPA conversion factor to obtain a Total Recoverable Metal at ambient
conditions. This method presumes that the metal is dissolved to the same extent as
it was during EPA's criteria development for metals. For more information on
conversion factors see the June, 1996 EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total
allowable concentration (permit limits) for each pollutant using the following
equation:
Ca = (s7Q10 + Qw) (Cwgs) — (s7Q10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L)
Cb = background concentration: assume zero for all toxicants except NH3*
(µg/L or mg/L)
Qw = permitted effluent flow (cfs, match s7Q10)
s7Q10 = summer low flow used to protect aquatic life from chronic toxicity
and human health through the consumption of water, fish, and
shellfish from noncarcinogens (cfs)
* Discussions are on -going with EPA on how best to address background
concentrations
Flows other than s7Q 10 may be incorporated as applicable:
IQ 10 = used in the equation to protect aquatic life from acute toxicity
QA = used in the equation to protect human health through the
consumption of water, fish, and shellfish from carcinogens
30Q2 = used in the equation to protect aesthetic quality
The permit writer enters the most recent 2-3 years of effluent data for each
pollutant of concern. Data entered must have been taken within four and one-half
years prior to the date of the permit application (40 CFR 122.21). The RPA
spreadsheet estimates the 95th percentile upper concentration of each pollutant.
The Predicted Max concentrations are compared to the Total allowable
concentrations to determine if a permit limit is necessary. If the predicted max
exceeds the acute or chronic Total allowable concentrations, the discharge is
considered to show reasonable potential to violate the water quality standard, and
a permit limit (Total allowable concentration) is included in the permit in
accordance with the U.S. EPA Technical Support Document for Water Quality -
Based Toxics Control published in 1991.
7. When appropriate, permit writers develop facility specific compliance schedules
in accordance with the EPA Headquarters Memo dated May 10, 2007 from James
Hanlon to Alexis Strauss on 40 CFR 122.47 Compliance Schedule Requirements.
The Total Chromium NC WQS was removed and replaced with trivalent
chromium and hexavalent chromium Water Quality Standards. As a cost savings

measure, total chromium data results may be used as a conservative surrogate in
cases where there are no analytical results based on chromium III or VI. In these
cases, the projected maximum concentration (95th %) for total chromium will be
compared against water quality standards for chromium III and chromium VI.
9. Effluent hardness sampling and instream hardness sampling, upstream of the
discharge, are inserted into all permits with facilities monitoring for hardness -
dependent metals to ensure the accuracy of the permit limits and to build a more
robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for Outfall
001 for this permit included:
Parameter
Value
Comments (Data Source)
Average Effluent Hardness
25 mg/L
No hardness data available
(mg/L)
Total as, CaCO3 or Ca+M
Average Upstream Hardness
25 mg/L
No hardness data available
(mg/L)
Total as, CaCO3 or Ca+M
7Q10 summer cfs
0 cfs
Value from BIMS
1 10 cfs
0 cfs
Value from RPA
Permitted Flow MGD
N/A
WTPs do not have flow limits

R.OY COOPER.
(rove' -nor
MICHAEL S. REGAN
LINDA Ci.JLPE.PPE.R
November 27, 2019
MEMORANDUM
To: Jeff Bryan
NC DEQ / DWR / Public Water Supply
Winston-Salem Regional Office
From: Brianna Young
Compliance and Expedited Permitting Unit
Subject: Review of Draft NPDES Permit NCO082949
Denton WTP
Davidson County
Please indicate below your agency's position or viewpoint on the draft permit and return this form by
December 27, 2019. If you have any questions on the draft permit, please contact me at 919-707-3619
or via e-mail [[e-mail]].
§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§
RESPONSE: (Check one)
Concur with the issuance of this permit provided the facility is operated and maintained properly,
the stated effluent limits are met prior to discharge, and the discharge does not contravene the
designated water quality standards.
F-1 Concurs with issuance of the above permit, provided the following conditions are met:
Opposes the issuance of the above permit, based on reasons stated below, or attached:
Signed:
C_ OVA.
J'ff- 50C Yam,
.Z. `Z�
Date:
North Carolina Department of Environmental Quality I Division ofUv,-ater, Re ource>
1.617 Mail Service Center I Raleigh, North Carolina 2 699-161.1
91.9-707-9000

From: Graznak, Jenny
Sent: Thursday, December 12, 2019 10:55 AM
To: Young, Brianna A
Subject: RE: Draft NPDES Permit NC0082949
Hi Brianna,
Paul DiMatteo had the following comments regarding this permit draft:
1. I don't see where they define the upstream sampling location. Usually it says explicitly. Maybe
the bridge at Bringle Ferry Road? Or it looks like there's a boat ramp right there?
2. Maybe they should explicitly state as a footnote that monthly copper monitoring is required
while the compliance schedule is in effect.
3. I don't see that they included an expected unit for total fluoride, but they have one for all the
other parameters.
Thank you,
Jenny Graznak
Assistant Regional Supervisor
Winston Salem Regional Office
Division of Water Resources
Department of Environmental Quality
450 West Hanes Mill Road, Suite 300
Winston Salem NC 27105
336-776-9695 office
336-403-7388 mobile
[e-mail]
Email correspondence to and from this address is subject to the North Carolina Public Records Law and
may be disclosed to third parties.
From: Young, Brianna A <[e-mail]>
Sent: Friday, November 22, 2019 10:26 AM
To: Snider, Lon <[e-mail]>; Graznak, Jenny <[e-mail]>
Subject: Draft NPDES Permit NC0082949
Good morning Lon and Jenny,
Attached is the draft NPDES permit for the Denton WTP (NC082949), which will be submitted to public
notice next week. Please provide any comments by December 27th.
Thank you,
Brianna Young
Environmental Specialist II
Compliance and Expedited Permitting Branch
Division of Water Resources
Department of Environmental Quality

Office: 919-707-3619
[e-mail]
Mailing address:
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the North Carolina Public Records Law and
may be disclosed to third parties.

NORTH CAROLINA
DAVIDSON COUNTY
Affidavit of Publication
Before the undersigned, a Notary Public of said County
and State, duly commissioned, qualified, and authorized
by law to administer oaths, personally appeared
Stan Bingham
who being first duly sworn, deposes and says that he is
Publisher
of The Denton Orator, engaged in the publication of a
newspaper known as The Denton Orator, published,
issued and entered as second class mail in the Town of
Denton, in said County and State; and that he is
authorized to make this affidavit and sworn statement;
that the notice or other legal advertisement, a true copy of
which is attached hereto, was published in The Denton
Orator on the following dates:
12/4/2019
and that this said newspaper in which such notice, paper,
document, or legal advertisement was published was, at
the time of each and every publication, a newspaper
meeting all of the requirements and qualifications of
Section 1.597 of the General Statutes of North Carolina,
1996, as amended, and was a qualified newspaper within
the meaning of Section 1-597 of the General Statutes of
North Carolina.
This day of �� 2019.
Swor to and subscribed before me, this
day of1_111��201.
Notary Publit---'
My commission expires: /
Public Notice
North Carolina Environmental
Management Commission/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Notice of Intent to Issue a
NPDES Wastewater Permit
The North Carolina Environmental Manage-
ment Commission proposes to issue a
NPDES wastewater discharge permit to the
person(s) listed below. Written comments re-
garding the proposed permit will be accepted
until 30 days after the publish date of this no-
tice. The Director of the NC Division of
Water Resources (DWR) may hold a public
hearing should there be a significant degree
of public interest. Please mail. comments
and/or information requests to DWR at the
.above address. Interested persons may visit
the DWR at 512 N. Salisbury Street, Raleigh,
NC to review information on file. Additional
information on NPDES permits and this no-
tice may be found on our website:
http://deq.nc-gov/about/divisions/water-re-
sources/water-resources-permits/wastewater-
branch/npdes-wastewater/public-notices,or
by calling [phone]. Town of Denton
(PO Box 306, Denton, NC 27239) has ap-
plied to renew its NPDES permit for the
Denton Water Treatment Plant [NC0082949]
which discharges filter -backwash and sedi-
mentation basin wastewater to an unnamed
tributary to the Yadkin River in the Yadkin -
Pee Dee River Basin. This discharge may af-
fect future wasteload allocations in this
portion of receiving stream.

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Proiect Information
Facility Name
WWTP/WTP Class
NPDES Permit
Outfal I
Flow, Ow (MGD)
Receiving Stream
HUC Number
Stream Class
❑ CHECK IF HQW OR ORW WQS
Denton WTP
PC-1
NCO082949
001
0.034
UT to Yadkin River
0304010306
WS-IV, B; CA
EZ Apply WS Hardness WQC
7010s (cfs)
7010w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
0.00
0.00
0.00
0.00
0.00
Effluent Hardness
-----
Upstream Hardness
Combined Hardness Chronic
Combined Hardness Acute
25 mg/L (Avg)
-------------------
25 mg/L (Avg)
25 mg/L
25 mg/L
Data Source(s)
❑ CHECK TO APPLY MODEL
Follow directions for data entry. In some cases a
comment menu list the available choices or a
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
Par01
Par02
Par03
Par04
Par05
Par06E
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Par25
Table 2. Parameters of Concern
Name WQS Type Chronic Modifier Acute PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic
Human Health Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Aquatic Life
NC
0.5899
FW
3.2396
ug/L
Chlorides
Aquatic Life
NC
230
FW
mg/L
Chlorinated Phenolic Compounds
water Supply
NC
1
A
ug/L
Total Phenolic Compounds
Aquatic Life
NC
300
A
ug/L
Chromium III
Aquatic Life
NC
117.7325
FW
905.0818
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
pg/L
Chromium, Total
Aquatic Life
NC
N/A
FW
N/A
pg/L
Copper
Aquatic Life
NC
7.8806
FW
10.4720
ug/L
Cyanide
Aquatic Life
NC
5
FW
1 22
10
1 ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
2.9416
FW
75.4871
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
37.2313
FW
335.2087
pg/L
Nickel
Water Supply
NC
25.0000
WS
N/A
pg/L
Selenium
Aquatic Life
NC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
0.2964
ug/L
Zinc
Aquatic Life
NC
126.7335
FW
125.7052
ug/L
NCO082949 Final FW RPA, input
1 /21 /2020

REASONABLE POTENTIAL ANALYSIS
11
Use "PASTE SPECIAL
H2
Use "PASTE SPECIAL
Effluent Hardness
Values" then "COPY"
Upstream Hardness
Values" then "COPY"
. Maximum data
. Maximum data
points = 58
points = 58
Date Data BDL=1/2DL
Results
Date Data BDL=1/2DL Results
1 25 25
Std Dev.
N/A
1
25 25 Std Dev.
N/A
2
Mean
25.0000
2
Mean
25.0000
3
C.V.
0.0000
3
C.V.
0.0000
4
n
1
4
n
1
5
10th Per value
25.00 mg/L
5
10th Per value
25.00 mg/L
6
Average Value
25.00 mg/L
6
Average Value
25.00 mg/L
7
Max. Value
25.00 mg/L
7
Max. Value
25.00 mg/L
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
36
37
37
38
38
39
39
40
40
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
NCO082949 Final FW RPA, data
2- 1/21/2020

REASONABLE POTENTIAL ANALYSIS
Pal
Par13
Par21
Use"PASTE SPECIAL
Use"PASTE SPECIAL
Use"PASTE SPECIAL
Copper
Values" then "COPY"
FIUOfICIQ
Values" then "COPY"
ZIt1C
Values" then "COPY"
Maximum data
Maximum data
Maximum data
points = 58
points = 58
points = 58
Date Data
BDL=1/2DL
Results
Date Data
BDL=1/2DL
Results
Date Data
BDL=II2DL
Results
1
11/5/2014 4
4
Std Dev.
3.2035
1
11/5/2014 <
100
50
Std Dev.
68.2992
1 11/5/2014 < 10
5
Std Dev.
4.0860
2
11/20/2014 2
2
Mean
3.5625
2
11/20/2014 <
100
50
Mean
75.3750
2 11/20/2014 < 10
5
Mean
6.5333
3
1/20/2016 < 2
1
C.V.
0.8992
3
1/20/2016 <
100
50
C.V.
0.9061
3 1/20/2016 18
18
C.V.
0.6254
4
4/27/2016 3
3
n
16
4
4/27/2016 <
100
50
n
16
4 4/27/2016 < 10
5
n
15
5
7/12/2016 < 2
1
5
7/12/2016
108
108
5 7/12/2016 < 10
5
6
10/12/2016 < 2
1
Mult Factor =
1.71
6
10/12/2016
67
67
Mult Factor =
1.71
6 10/12/2016 15
15
Mult Factor =
1.52
7
12/20/2016 11
11
Max. Value
11.00 ug/L
7
12/20/2016 <
100
50
Max. Value
320.0 ug/L
7 1/17/2017 < 10
5
Max. Value
18.0 ug/L
8
1/17/2017 < 2
1
Max. Fred Cw
18.81 ug/L
8
1/17/2017 <
100
50
Max. Pred Cw
547.2 ug/L
8 5/4/2017 < 10
5
Max. Fred Cw
27.4 ug/L
9
5/4/2017 10
10
9
5/4/2017 <
100
50
9 8/8/2017 < 10
5
10
8/8/2017 3
3
10
8/8/2017
111
111
10 2/6/2018 < 10
5
11
2/6/2018 < 2
1
11
2/6/2018 <
100
50
11 5/9/2018 < 10
5
12
5/9/2018 3
3
12
5/9/2018 <
100
50
12 8/7/2018 < 10
5
13
8/7/2018 7
7
13
8/7/2018 <
100
50
13 11/6/2018 < 10
5
14
11/6/2018 5
5
14
11/6/2018
320
320
14 2/20/2019 < 10
5
15
2/20/2019 3
3
15
2/20/2019 <
100
50
15 8/20/2019 < 10
5
16
8/20/2019 < 2
1
16
8/20/2019 <
100
50
16
17
17
17
18
18
18
19
19
19
20
20
20
21
21
21
22
22
22�
23
23
23
24
24
24
25
25
25
26
26
26
27
28
27
28
27
28
29
29
29
30
30
30
dL
31
31
31
32
32
32
33
33
33
34
34
34
35
35
35
36
36
36
37
37
37
38
38
38
39
39
39
40
40
40
41
41
41
42
42
42
43
43
43
44
44
44
45
45
45
46
46
46
47
47
47
48
48
48
49
49
49
50
50
50
51
51
51
52
52
52
53
53
53
54
54
54
55
55
55
56
56
56
57
57
57
58
58
58
NCO082949 Final FW RPA, data
3- 1/21/2020

Denton WTP
NCO082949
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM
Qw (MGD) =
0.0342
1Q10S (cfs) =
0.00
7Q10S (cfs) =
0.00
7Q10W (cfs) =
0.00
30Q2 (cfs) =
0.00
Avg. Stream Flow, QA (cfs) =
0.00
Receiving Stream:
UT to Yadkin River HUC 0304010306
DATA POINTS = 58
WWTP/WTP Class: PC-1
IWC% @ 1Q10S =
100
IWC% @ 7Q10S =
100
IWC% @ 7Q10W =
100
1WC% @ 30Q2 =
100
IW%C @ QA =
100
Stream Class:
WSW, B; CA
Outfall 001
Qw = 0.03417778 MGD
COMBINED HARDNESS (me/L)
Acute = 25 mg/L
Chronic = 25 mg/L
YOU HAVE DESIGNATED THIS RECEIVING
STREAM AS WATER SUPPLY
Effluent Hard: 0 value > 100 mg/L
Effluent Hard Avg = 25 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
an
Applied
Chronic Acute
# Det. Max Pred Cw Allowable Cw
Standa
Acute: 10.47
RP shown - apply Monthly Monitoring with Limit
Copper
NC
7.8806 FW 10.4720
ug/L
16 10
18.81
_ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 7.88
RP shown - apply Monthly Monitoring with Limit
2 values > Allowable Cw
Acute: NO WQS
Fluoride
NC
1800 FW
ug/L
16 4
547.2
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 1,800.0
No RP, Predicted Max < 50% of Allowable Cw
No value > Allowable Cw
Acute: 125.7
No RP, Predicted Max < 50% of Allowable Cw
Zinc
NC
126.7335 FW 125.7052
ug L
15 2
27.4
_ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 126.7
No RP, Predicted Max < 50% of Allowable Cw
No value > Allowable Cw
NCO082949 Final FW RPA, rpa
Page 4 of 49 1/21/2020

NH3/TRC WLA Calculations
Facility: Denton WTP
PermitNo. NC0082949
Prepared By: Brianna Young
Enter Design Flow (MGD): 0.034178
Enter s7Q10 (cfs): 0
Enter w7Q10 cfs : 0
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
0
s7Q10 (CFS)
0
DESIGN FLOW (MGD)
0.034178
DESIGN FLOW (MGD)
0.03418
DESIGN FLOW (CFS)
0.052976
DESIGN FLOW (CFS)
0.05298
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
100.00
IWC (%)
100.00
Allowable Conc. (ug/1)
17
Allowable Conc. (mg/1)
1.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
0
Monthly Average Limit:
200/100ml DESIGN FLOW (MGD)
0.03418
(If DF >331; Monitor)
DESIGN FLOW (CFS)
0.05298
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
1.00 Upstream Bkgd (mg/1)
0.22
IWC (%)
100.00
Allowable Conc. (mg/1)
1.8
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals)
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis)
If the allowable ammonia concentration is > 35 mg/L, no limit shall be imposed
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

Whole Effluent Toxicity Testing and Self Monitoring Summary
Dare County-/002 (RO) WTP
NCO070157/002
County: Dare
Mysd24PF
Begin:
2/1/2009
24hr p/f ac monit: 90 NonComp:
J
F M
A
M
2015
Pass
- -
Pass
-
2016
Pass
- -
Pass
-
2017
Fail
- -
Pass
-
2018
Pass
- -
Pass
-
2019
Pass
- -
Pass
-
Davidson Water Inc. WTP
NCO084425/001
County: Davidson
Ceri7dPF
Begin:
10/1/2017 Chr Monit: 0.25%
NonComp:
J
F M
A
M
2015
-
Fail -
-
Fail
2016
-
Fail -
-
Pass
2017
-
Pass -
-
Pass
2018
-
H Pass
-
-
2019
-
Fail -
-
-
Deer Chase Subdivision
WWTP
NCO063746/001
County: Wake
Ceri7dPF
Begin:
2/1/2018
chr lim: 90% @ 0.05
NonComp:
Single
J
F M
A
M
2015
Pass
- -
Pass
-
2016
Pass
- -
Pass
-
2017
Fail
>100 >100 >100
Pass
-
2018
Fail
<22.5 <22.5
Fail
>100
2019
Pass
- -
Pass
-
1
Denton WTP, Town of
NCO082949/001
County: Davidson
Ceri7dPF
Begin:
5/1/2014
Chr Monit: 90%
NonComp:
J
F M
A
M
2015
-
Fail -
-
Pass
2016
-
Fail -
-
Pass
2017
-
Pass -
-
Pass
2018
-
Pass -
-
Pass
2019
-
Pass -
-
Pass
Denton WWTP
NCO026689/001
County: Davidson
Ceri7dPF
Begin:
8/1/2016
chr lim: 90%
NonComp:
Single
J
F M
A
M
2015
-
Pass -
-
Pass
2016
-
Pass -
>100(P)
Pass
2017
-
Pass>100(P) -
-
Pass
2018
-
Pass -
-
Pass>100(P)
2019
-
Pass -
-
Pass
Region: WARO Basin: PAS56 Jan Apr Jul Oct SOC JOC:
7Q10: Tidal PF: 1.42 IWC: NA Freq: Q
J J A S O N
- Pass - - Pass -
Pass - - Pass -
Pass - - Pass -
Pass - - Pass -
NR
Region: WSRO Basin: YAD04 SOC JOC:
7Q10: PF: 0.3 IWC: Freq: A
J J A S O N
- - Pass - - Pass
- Pass - - Pass
- - Pass - - Fail
Region: RRO
Basin: NEU02
Jan Apr Jul Oct
7Q10: 0.0
PF: 0.05 IWC:
100 Freq: Q
J
J
A
S
O
-
Pass
-
-
Pass
-
Pass
-
-
Pass
-
Fail
>100
>100
Pass
>100
Pass
-
-
Pass
-
Pass
Region: WSRO
Basin: YAD08
Feb May Aug Nov
70.10:
PF: IWC:
Freq: Q
J
J
A
S
O
Pass
-
Fail
Pass
Pass
Region: WSRO
Basin: YAD08
Feb May Aug Nov
70.10: 0.0
PF: 0.8 IWC:
100 Freq: Q
J
J
A
S
O
Pass
-
Pass
Pass
Pass
-
-
>100(P) Pass
-
-
SOC JOC:
N
SOC JOC:
N
Fail
Fail
Pass
Pass
SOC JOC:
N
Pass
Pass
Pass
Pass
C
D
Fail
G
C
C
Leeend: P= Fathead minnow (Pimohales oromelas). H=No Flow (facilitv is active). s = Solit test between Certified Labs
Page 34 of 124

MONITORING REPORT(MR) VIOLATIONS for:
Permit: nc0082949 MRs Between 10 - 2014 and 10 - 2019 Region: %
Facility Name: % Param Name % County: %
Major Minor: % L
Report Date: 10/18/19 Page: 1 of 5
Violation Category% Program Category:
Subbasin:% Violation Action: %
PERMIT: NCO082949
FACILITY:
Town of Denton - Denton WTP
COUNTY: Davidson
REGION: Winston-Salem
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
11 -2018
001
Effluent
Aluminum, Total (as Al)
11/30/18
Monthly
mg/I
8
10.89
36.1
Monthly Average
Proceed to NOD
Exceeded
10 _2014
001
Effluent
Chlorine, Total Residual
10/01/14
2 X month
ug/I
17
25
47.1
Daily Maximum
No Action, BPJ
Exceeded
11 -2014
001
Effluent
Chlorine, Total Residual
11/06/14
2 X month
ug/I
17
21
23.5
Daily Maximum
No Action, BPJ
Exceeded
01 -2015
001
Effluent
Chlorine, Total Residual
01/15/15
2 X month
ug/I
17
34
100
Daily Maximum
No Action, BPJ
Exceeded
02 - 2015
001
Effluent
Chlorine, Total Residual
02/12/15
2 X month
ug/I
17
23
35.3
Daily Maximum
No Action, BPJ
Exceeded
02 -2015
001
Effluent
Chlorine, Total Residual
02/19/15
2 X month
ug/I
17
30
76.5
Daily Maximum
No Action, BPJ
Exceeded
03 -2015
001
Effluent
Chlorine, Total Residual
03/19/15
2 X month
ug/I
17
22
29.4
Daily Maximum
No Action, BPJ
Exceeded
03 -2015
001
Effluent
Chlorine, Total Residual
03/26/15
2 X month
ug/I
17
20
17.6
Daily Maximum
No Action, BPJ
Exceeded
04 -2015
001
Effluent
Chlorine, Total Residual
04/01/15
2 X month
ug/I
17
24
41.2
Daily Maximum
No Action, BPJ
Exceeded
04 _2015
001
Effluent
Chlorine, Total Residual
04/15/15
2 X month
ug/I
17
22
29.4
Daily Maximum
No Action, BPJ
Exceeded
04 -2015
001
Effluent
Chlorine, Total Residual
04/21/15
2 X month
ug/I
17
26
52.9
Daily Maximum
No Action, BPJ
Exceeded
05 - 2015
001
Effluent
Chlorine, Total Residual
05/04/15
2 X month
ug/I
17
24
41.2
Daily Maximum
No Action, BPJ
Exceeded
05 -2015
001
Effluent
Chlorine, Total Residual
05/12/15
2 X month
ug/I
17
25
47.1
Daily Maximum
No Action, BPJ
Exceeded
05 - 2015
001
Effluent
Chlorine, Total Residual
05/20/15
2 X month
ug/I
17
24
41.2
Daily Maximum
No Action, BPJ
Exceeded
05 - 2015
001
Effluent
Chlorine, Total Residual
05/28/15
2 X month
ug/I
17
20
17.6
Daily Maximum
No Action, BPJ
Exceeded
06 -2015
001
Effluent
Chlorine, Total Residual
06/02/15
2 X month
ug/I
17
20
17.6
Daily Maximum
No Action, BPJ
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: nc0082949 MRs Between 10 - 2014 and 10 - 2019 Region: %
Facility Name: % Param Name % County: %
Major Minor: % L
Report Date: 10/18/19 Page: 2 of 5
Violation Category:% Program Category: %
Subbasin:% Iq
Violation Action:
PERMIT: NCO082949
FACILITY:
Town of Denton -Denton WTP
COUNTY: Davidson
REGION: Winston-Salem
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
06 -2015
001
Effluent
Chlorine, Total Residual
06/11/15
2 X month
ug/I
17
21
23.5
Daily Maximum
No Action, BPJ
Exceeded
06 -2015
001
Effluent
Chlorine, Total Residual
06/18/15
2 X month
ug/I
17
21
23.5
Daily Maximum
No Action, BPJ
Exceeded
06 - 2015
001
Effluent
Chlorine, Total Residual
06/26/15
2 X month
ug/I
17
20
17.6
Daily Maximum
No Action, BPJ
Exceeded
07 - 2015
001
Effluent
Chlorine, Total Residual
07/01/15
2 X month
ug/I
17
19
11.8
Daily Maximum
No Action, BPJ
Exceeded
07 - 2015
001
Effluent
Chlorine, Total Residual
07/23/15
2 X month
ug/I
17
19
11.8
Daily Maximum
No Action, BPJ
Exceeded
08 - 2015
001
Effluent
Chlorine, Total Residual
08/21/15
2 X month
ug/I
17
22
29.4
Daily Maximum
No Action, BPJ
Exceeded
08 - 2015
001
Effluent
Chlorine, Total Residual
08/27/15
2 X month
ug/I
17
18
5.9
Daily Maximum
No Action, BPJ
Exceeded
08 _ 2015
001
Effluent
Chlorine, Total Residual
08/30/15
2 X month
ug/I
17
25
47.1
Daily Maximum
No Action, BPJ
Exceeded
09 - 2015
001
Effluent
Chlorine, Total Residual
09/01/15
2 X month
ug/I
17
23
35.3
Daily Maximum
No Action, BPJ
Exceeded
09 -2015
001
Effluent
Chlorine, Total Residual
09/10/15
2 X month
ug/I
17
18
5.9
Daily Maximum
No Action, BPJ
Exceeded
09 -2015
001
Effluent
Chlorine, Total Residual
09/22/15
2 X month
ug/I
17
20
17.6
Daily Maximum
No Action, BPJ
Exceeded
10 - 2015
001
Effluent
Chlorine, Total Residual
10/01/15
2 X month
ug/I
17
22
29.4
Daily Maximum
No Action, BPJ
Exceeded
10 - 2015
001
Effluent
Chlorine, Total Residual
10/08/15
2 X month
ug/I
17
20
17.6
Daily Maximum
No Action, BPJ
Exceeded
10 - 2015
001
Effluent
Chlorine, Total Residual
10/14/15
2 X month
ug/I
17
19
11.8
Daily Maximum
No Action, BPJ
Exceeded
10 - 2015
001
Effluent
Chlorine, Total Residual
10/22/15
2 X month
ug/I
17
24
41.2
Daily Maximum
No Action, BPJ
Exceeded
10 - 2015
001
Effluent
Chlorine, Total Residual
10/31/15
2 X month
ug/I
17
23
35.3
Daily Maximum
No Action, BPJ
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: nc0082949 MRs Between 10 - 2014 and 10 - 2019 Region: %
Facility Name: % Param Name % County: %
Major Minor: % L
Report Date: 10/18/19 Page: 3 of 5
Violation Category:% Program Category: %
Subbasin:% Iq
Violation Action:
PERMIT: NCO082949
FACILITY:
Town of Denton -Denton WTP
COUNTY: Davidson
REGION: Winston-Salem
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
11 -2015
001
Effluent
Chlorine, Total Residual
11/05/15
2 X month
ug/I
17
25
47.1
Daily Maximum
No Action, BPJ
Exceeded
11 - 2015
001
Effluent
Chlorine, Total Residual
11/11/15
2 X month
ug/I
17
20
17.6
Daily Maximum
No Action, BPJ
Exceeded
11 - 2015
001
Effluent
Chlorine, Total Residual
11/19/15
2 X month
ug/I
17
22
29.4
Daily Maximum
No Action, BPJ
Exceeded
11 - 2015
001
Effluent
Chlorine, Total Residual
11/24/15
2 X month
ug/I
17
20
17.6
Daily Maximum
No Action, BPJ
Exceeded
11 - 2015
001
Effluent
Chlorine, Total Residual
11/30/15
2 X month
ug/I
17
21
23.5
Daily Maximum
No Action, BPJ
Exceeded
12 _ 2015
001
Effluent
Chlorine, Total Residual
12/02/15
2 X month
ug/I
17
19
11.8
Daily Maximum
No Action, BPJ
Exceeded
12 _ 2015
001
Effluent
Chlorine, Total Residual
12/09/15
2 X month
ug/I
17
21
23.5
Daily Maximum
No Action, BPJ
Exceeded
12 _ 2015
001
Effluent
Chlorine, Total Residual
12/16/15
2 X month
ug/I
17
20
17.6
Daily Maximum
No Action, BPJ
Exceeded
12 - 2015
001
Effluent
Chlorine, Total Residual
12/22/15
2 X month
ug/I
17
18
5.9
Daily Maximum
No Action, BPJ
Exceeded
12 - 2015
001
Effluent
Chlorine, Total Residual
12/28/15
2 X month
ug/I
17
25
47.1
Daily Maximum
No Action, BPJ
Exceeded
01 - 2016
001
Effluent
Chlorine, Total Residual
01/20/16
2 X month
ug/I
17
20
17.6
Daily Maximum
No Action, BPJ
Exceeded
01 - 2016
001
Effluent
Chlorine, Total Residual
01/25/16
2 X month
ug/I
17
19
11.8
Daily Maximum
No Action, BPJ
Exceeded
01 - 2016
001
Effluent
Chlorine, Total Residual
01/30/16
2 X month
ug/I
17
21
23.5
Daily Maximum
No Action, BPJ
Exceeded
02 _ 2016
001
Effluent
Chlorine, Total Residual
02/17/16
2 X month
ug/I
17
18
5.9
Daily Maximum
No Action, BPJ
Exceeded
06 - 2016
001
Effluent
Chlorine, Total Residual
06/08/16
2 X month
ug/I
17
18
5.9
Daily Maximum
No Action, BPJ
Exceeded
06 - 2016
001
Effluent
Chlorine, Total Residual
06/28/16
2 X month
ug/I
17
19
11.8
Daily Maximum
No Action, BPJ
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: nc0082949 MRs Between 10 - 2014 and 10 - 2019 Region: %
Facility Name: % Param Name % County: %
Major Minor: % L
Report Date: 10/18/19 Page: 4 of 5
Violation Category:% Program Category: %
Subbasin:% Iq
Violation Action:
PERMIT: NCO082949
FACILITY: Town of Denton -Denton WTP
COUNTY: Davidson
REGION: Winston-Salem
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
11 -2015
001
Effluent
Solids, Total Suspended -
11/05/15
2 X month
mg/I
45
55
22.2
Daily Maximum
No Action, BPJ
Concentration
Exceeded
11 _2015
001
Effluent
Solids, Total Suspended -
11/30/15
2 X month
mg/I
30
40.5
35
Monthly Average
No Action, BPJ
Concentration
Exceeded
08 -2018
001
Effluent
Solids, Total Suspended -
08/07/18
2 X month
mg/I
45
75
66.7
Daily Maximum
None
Concentration
Exceeded
08 -2018
001
Effluent
Solids, Total Suspended -
08/31/18
2 X month
mg/I
30
44.2
47.3
Monthly Average
None
Concentration
Exceeded
08 -2019
001
Effluent
Solids, Total Suspended -
08/31/19
2 X month
mg/I
30
34
13.3
Monthly Average
None
Concentration
Exceeded
Monitoring Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
06 -2018
001
Effluent
Aluminum, Total (as Al)
06/30/18
Monthly
mg/I
Frequency Violation
Proceed to NOV
07 -2018
001
Effluent
Aluminum, Total (as Al)
07/31/18
Monthly
mg/I
Frequency Violation
Proceed to NOV
11 - 2014
001
Effluent
Flow, in conduit or thru
11/01/14
Weekly
mgd
Frequency Violation
No Action, BPJ
treatment plant
03 -2015
001
Effluent
Flow, in conduit or thru
03/14/15
Weekly
mgd
Frequency Violation
No Action, BPJ
treatment plant
04 -2015
001
Effluent
Flow, in conduit or thru
04/11/15
Weekly
mgd
Frequency Violation
No Action, BPJ
treatment plant
05 _2015
001
Effluent
Flow, in conduit or thru
05/02/15
Weekly
mgd
Frequency Violation
No Action, BPJ
treatment plant
06 -2018
001
Effluent
Manganese, Total (as Mn)
06/30/18
Monthly
ug/I
Frequency Violation
No Action, BPJ
07 -2018
001
Effluent
Manganese, Total (as Mn)
07/31/18
Monthly
ug/I
Frequency Violation
No Action, BPJ
11 -2014
001
Effluent
Turbidity
11/30/14
2 X month
ntu
Frequency Violation
No Action, BPJ
Reporting Violation

MONITORING REPORT(MR) VIOLATIONS for:
Permit: nc0082949 MRs Between 10 - 2014 and 10 - 2019 Region: %
Facility Name: % Param Name % County: %
Major Minor: %
Report Date: 10/18/19 Page: 5 of 5
Violation Category:% Program Category: %
Subbasin:% Iq
Violation Action:
PERMIT: NCO082949 FACILITY: Town of Denton -Denton WTP COUNTY: Davidson REGION: Winston-Salem
MONITORING
REPORT OUTFALL LOCATION
VIOLATION UNIT OF CALCULATED %
PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over
VIOLATION TYPE
VIOLATION ACTION
10 -2014
12/01/14
Late/Missing DMR
Proceed to NOV
12 -2014
01/31/15
Late/Missing DMR
Proceed to NOV
01 -2015
03/03/15
Late/Missing DMR
Proceed to NOV
03-2015
05/01/15
Late/Missing DMR
No Action, BPJ
04-2015
05/31/15
Late/Missing DMR
No Action, BPJ
06-2015
07/31/15
Late/Missing DMR
No Action, BPJ
07-2015
08/31/15
Late/Missing DMR
No Action, BPJ
09-2015
10/31/15
Late/Missing DMR
No Action, BPJ
10-2015
12/01/15
Late/Missing DMR
No Action, BPJ
12 _ 2015
01/31/16
Late/Missing DMR
No Action, BPJ
01 - 2016
03/02/16
Late/Missing DMR
No Action, BPJ

ROY COOPER NORTH CAROLINA
Governor Eavbwamental Quality
MICHAEL S. REG-AN
secretory
LINDA CULPEPPER
Interim Director
October 19, 2018
Genie Russell, Clerk Town
Town of Denton
PO Box 306
Denton, NC 27239-0306
Subject: Permit Renewal
Application No. NCO082949
Denton WTP
Davidson County
Dear Applicant:
The Water Quality Permitting Section acknowledges the October 18, 2018 receipt of your permit renewal application and
supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW permitting
branch. Per G.S. 150B-3 your current permit does not expire until permit decision on the application is made.
Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit. The
permit writer will contact you if additional information is required to complete your permit renewal. Please respond in a
timely manner to requests for additional information necessary to allow a complete review of the application and renewal
of the permit.
Information regarding the status of your renewal application can be found online using the Department of Environmental
Quality's Environmental Application Tracker at:
https://deg.nc.ciov/permits-regulations/permit-guidance/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
Siinnc(erely,
w
Wren hedford
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application
North Carolina Department of Environmental Quality I Division of Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-807-6300

TOWN OF DENTON RECEIVED/DENR/DWR
OCT 18 2018
October 10, 2018 Water Resources
Permitting Section
NCDEQ/ DWR/ NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Request for renewal of Town of Denton WTP NPDES Discharge Permit NCO082949
Dear Sirs,
I am hereby submitting the required NPDES Permit Application Short Form C to respectfully
request renewal of our NPDES discharge permit NCO082949 for the Water Treatment Facility.
If there is any further information that you require, do not hesitate to contact me at 336-859-5885
or at email address [e-mail].
Thank you for your attention to this matter.
Sincerely, /yl., -
Michael S. High
Town of Denton Utility Director
201 W. Salisbury Street
P.O. Box 306 Phone: [phone]
Denton, NC 27239 Fax: [phone]
This institution is an equal opportunity provider and employer

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Mail the complete application to:
NCDEQ / DWR / NPDES
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number INCO082949
If you are completing this form in computer use the TAB key or the up - down arrows to move from one
field to the next. To check the boxes, click your mouse on top of the box. Otherwise, please print or type.
1. Contact Information:
Owner Name
Facility Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
John Gray, Interim Town Manager
Denton WTP
PO Box 306
Denton DECEIVED/DENR/DWR
NC 27239 OCT 18 2018
[phone] Water Resources
[phone] Permitting Section
[e-mail]
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road
City
State / Zip Code
County
3049 Bringle Ferry Road
Denton
NC 27239
Davidson
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name Town of Denton
Mailing Address PO Box 306
City Denton
State / Zip Code NC 27239
Telephone Number [phone]
Fax Number [phone]
4. Ownership Status:
Federal ❑
State ❑
Private ❑
Page I of 3 Version 6/2017

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
5. Type of treatment plant:
❑ Conventional (Includes coagulation, flocculation, and sedimentation, usually followed by
filtration and disinfection)
❑ Ion Exchange (Sodium Cycle Cationic ion exchange)
❑ Green Sand Filter (No sodium recharge)
❑ Membrane Technology (RO, nanofiltration)
Check here if the treatment process also uses a water softener ❑
6. Description of source water(s) (i.e. groundwater, surface water)
Surface water from Tuckertown Reservoir apart of the Yadkin/Pee Dee River Basin
7. Describe the treatment process(es) for the raw water:
Carbon addition, Potassium Permanganate addition, Flash mixing, Caustic Soda and Alum
addition, Sedimentation basin, sand filters, Chlorine added, Clear well, Chlorine added,
distribution system.
8. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
Approximately 90% of the wastewater generated is from the sedimentation basins. The
remaining 10% comes from backwashing sand filters
9. Number of separate discharge points: 01 Outfall Identification number(s) 001
10. Frequency of discharge: Continuous ❑ Intermittent F1
If intermittent:
Days per week discharge occurs: 1 Duration: 2 hours
11. Plant design potable flowrate 2.2 MGD
Backwash or reject flow 0.342 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
Lick Creek, 1636390.453, 674200.847
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Alum / aluminum sulfate Yes ✓ No
Vcr�ion 6 2017
Page 2 of 3

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
5. Type of treatment plant:
® Conventional (Includes coagulation, flocculation, and sedimentation, usually followed by
filtration and disinfection)
❑ Ion Exchange (Sodium Cycle Cationic ion exchange)
❑ Green Sand Filter (No sodium recharge)
❑ Membrane Technology (RO, nanofiltration)
Check here if the treatment process also uses a water softener ❑
6. Description of source water(s) (i.e. groundwater, surface water)
Surface water from Tuckertown Reservoir apart of the Yadkin/Pee Dee River Basin
7. Describe the treatment process(es) for the raw water:
Carbon addition, Potassium Permanganate addition, Flash mixing, Caustic Soda and Alum
addition, Sedimentation basin, sand filters, Chlorine added, Clear well, Chlorine added,
distribution system.
8. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
Approximately 90% of the wastewater generated is from the sedimentation basins. The
remaining 10% comes from backwashing sand filters
9. Number of separate discharge points: 01 Outfall Identification number(s) 001
10. Frequency of discharge: Continuous ❑ Intermittent
If intermittent:
Days per week discharge occurs: 1 Duration: 2 hours
11. Plant design potable flowrate 2.2 MGD
Backwash or reject flow 0.342 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
Lick Creek, 1636390.453, 674200.847
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Alum / aluminum sulfate Yes ✓ No
Page 2 of 3
Version 6/2017

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Iron sulfate / ferrous sulfate Yes No ✓
Fluoride Yes No ✓
Ammonia nitrogen / Chloramines Yes No ✓
Zinc -orthophosphate or sweetwater CP1236 Yes No ✓
List any other additives below:
Caustic Soda, Orthopolyphosphate blend, Potassium Permanganate
14. Is this facility located on Indian country? (check one)
Yes ❑ No
15. Additional Information:
> Provide a schematic of flow through the facility, include flow volumes at all points in
the water treatment process. The plan should show the point[s] of addition for
chemicals and all discharges routed to an outfall [including stormwater].
> Solids Handling Plan
16. NEW Applicants
Information needed in addition to items 1-15:
> New applicants are strongly recommended to contact a permit coordinator with the
NCDENR Customer Service Center.
Was the Customer Service Center contacted? ❑ Yes ❑ No
> Analyses of source water collected
Engineering Alternative Analysis
Discharges from Ion Exchange and Reverse Osmosis plants shall be evaluated using a
water quality model.
17. Applicant Certification
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
ch Pt4 / /�, h
ted name of Person
j /a'
of
or'
Title
/O - //- /
Date
North Carolina General Statute 143-215.6 (b)(2) provides that: Any person who knowingly makes any false statement representation, or certification in any application,
record, report, plan, or other document files or required to be maintained under Article 21 or regulations of the Environmental Management Commission implementing that
Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or monitoring device or method required to be operated or maintained under Article 21
or regulations of the Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor punishable by a fine not to exceed $25,000, or by
imprisonment not to exceed six months, or by both. (18 U.S.C. Section 1001 provides a punishment by a fine of not more than $25,000 or imprisonment not more than 5
years, or both, for a similar offense.)
Page 3 of 3 Version 6/2017

EXISTING RATED CAPACITY: 1568 GPM (2.25 MGD)
- PROPOSED RATED CAPACITY: 1568 GPM (2.25 MGD)
Q� PQ
J
PN4
4y
t9
`°ryl�,�tjl'
R J
CJ c1l
RAW
RAW WATER
FLASH MIX
FLOCCULATOR
SEDIMENTSTATION
BV_VEASIN
CLEARWELLVAL
FINISHED
WATER
LRAWWATER
PUMP STATION
DISTRIBUTION
�nILTER
SYSTEM
EXIST: 2 - PUMPS
FTM&NW. NEW 12' BBi7rUhRUlIL-0KNBeR
DETENTION TIME
SURFACE LOADING
FILTER RATE
EXIST: 1 EA. 500.000 GAL POST: 2 - PUMPS (1DOO GPM
1400 GPM O SOFT. TDX
FLOW TUBE WITH
/ O 33OFT TDH)
PROPOSED: MAINTENANCE
MODULATING VALVE RGOPCBEO: MIN.
DETENTION#XM9UW-
EXIST: 20 MIN.
EXIST: 0.35 GPM / SF
EXIST; 4 GPM / SF (1568 GPM)
�P�GALA 5D0.000! 1 PUMP (2000 GPM O 360 FT. TDH)
40 MIN.
HRw"W GPM / S'
WITH 2 FILTERS / 0 SPARE
MMM: ADD VFD TO ✓
r
FIND: 4 GPM / SF (1568 GPM)
WITH 2 FILTEI;S / 1 SPARE
/ 2DD0 GPM PUMP
NPDES BACKWASH /
PERMIT SLUDGE
HOLDING BASIN
LIB6i. Al -AP . 280"&-SAL LAXIINN906 N
PMPQSW. NEW 200,000 GAL LINED BASIN:
RETAIN APPROX. 100.000 GAL POUS ING BASIN.
INSTALL 2400 SF. DRYING BEDS.
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LEGEND
IIO_. PR(?r
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D FIRE HYDRANT
REDUCER/ ENLAR6ER
F- PLUG/ CAP
WATER MAIN
_ FENCE
I --704-- r.ONI'0U2S
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added � r-, n I�AN6 / P
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2 Krh�vo yd Carbon
powered Actiyay
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Pre, Caus4iL
3 Pre- Chloride
`f Chlorinel
Ca,uS- iC,
Phpyha�t
NEW FILTER PIPE
GALLERY
NEW YARD
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INSTALL NEW 2;RISEi2- IN5TAL.L. NEW X R15ER
Epp 591!
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m

Permit NCO082949

Town of Denton Solids Removal Plan
The Town of Denton, NC disposes of the Alum sludge by using the method land
applying. The sludge is removed from the water plant lagoons 2-3 times a year.
Land application company used is Southern Soil Builders.
Southern Soil Builders address: Southern Soil Builders, Inc.
958 Hoots Road, Roaring River, NC 28669, US
[phone]
The Town of Denton has three options for the disposal of residual solids:
By using the Class "A" Water Quality Permit WQ0038071 issued to Southern Soil
Builders for up to 300 dry tons per year.
By using the Class "B" Water Quality Permit WQ0016966 issued to the Town of
Denton for up to 200 dry tons per year.
By using both permits listed above for up to 500 dry tons per year.
201 W. Salisbury Street
PO Box 306
Denton, NC 27239
Phone: [phone]
Fax: [phone]
This institution is an equal opportunity provider and employer.