NC0084212_Draft Permit_20190514

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
NORTH CAROLINA
Environif ental Quality
May 14, 2019
Johnny Lambert, Director of Public Utilities
Davie County Water System
298 East Depot Street
Mocksville, North Carolina 27028
Subject: Review of NPDES Permit - DRAFT
NC0084212, Class PC-1
Sparks Road Water Treatment Plant (WTP)
728 Sparks Road, Mocksville
Davie County
Dear Mr. Lambert:
Based on your request to renew the subject NPDES permit, the Division of Water Resources (DWR or the
Division) hereby transmits this draft for your review and comment. Please review it carefully to ensure
your understanding of the limits and monitoring conditions, and to correct errors, if any.
Concurrent with this notification, the Division will solicit public comment on this draft by publishing a
notice in newspapers having circulation in the general Davie County area, as required by the NPDES
Program. Please provide your written comments, if any, to DEQ/DWR/NPDES no later June 18, 2019
(approximately 30 days after receiving this document). Your written comments are welcome but are not
mandatory.
Changes for Renewal. Because renewal requires added permit limits for Total Copper and Total Zinc
based on reasonable potential (see below), this facility does not currently qualify for WTP General Permit
NCG590000.
The Division understands that you have made no significant changes in your wastewater treatment
processes since last renewal. We have made changes to your permit by updating your facility description
and site map and have also added relevant regulatory citations to permit sections for your convenience.
Specifically, we have:
1. discontinued monitoring for Total Iron, no longer a WTP parameter for concern as the
discharge database averages less than 1.00 mg/L;
2. added permit limits for Total Zinc and Total Copper because databases show reasonable
potential to exceed their respective water -quality standard; monitoring has therefore
increased from Quarterly to Monthly based on RPA;
3. conversely, Total Fluoride monitoring remains Quarterly because the database does not
show reasonable potential, no changes recommended;
4. updated units of measure for metals as micrograms per litter (ug/L) to facilitate future
compliance evaluation) [see units, section A. (1.)]; past databases were compromised by
analyses reported in milligrams per liter (mg/L;
5. eliminated previous table Footnote 3. [section A. (L)]; sampling a given parameter
"...concurrently with WET -testing" is no longer required;
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617 — 919.707.9000

Johnny Lambert, Director of Public Utilities
Davie County Water System
Draft Review May 2019
Page 2 of 2
6. per EPA, added Total Hardness monitoring Quarterly of Effluent only [upstream not
practicable under zero -flow receiving stream conditions]; monitoring is required for
future evaluation of metal concentrations in dissolved fraction; and lastly
7. removed the Permit Re -Opener [previous permit section A. (4.)] regarding Whole
Effluent Toxicity (WET) testing; records indicate a consistent history of compliance
with all results indicating "Pass" (19 consecutive Quarterly tests).
Division records show that you have successfully registered with the eDMR Program. Please be reminded
that until the state's eDMR application is approved compliant with EPA's Cross -Media Electronic
Reporting Regulation (CROMERR), all permittees must continue to submit hardcopy of DMRs as backup
to eDMR reporting [see updated permit section A. (3.)].
Following the mandatory 45-day public comment period, the Division will review all pertinent comments,
if any, and take appropriate action prior to issuing an NPDES permit final. If you have questions
concerning this draft, please e-mail me [e-mail]], or call my direct line [phone].
VPDES Unit
Enclosure: NPDES Permit NCO084212 (ren
hc: NPDES Program Files [draft permit and Fact Sheet]
ec: DWR/WSRO, attn Lon Snider [draft permit and Fact Sheet]
OCU Maureen Kinney [draft permit and Fact Sheet]
ATU Susan Meadows [draft permit and Fact Sheet]
PWS Jeff Bryan Deff [e-mail]] [draft permit and Fact Sheet]

NPDES Permit NCO084212
WTP Class PC-1
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provisions of North Carolina General Statute 143-21=5.1, other lawful
standards and regulations promulgated and adopted by the North, Carolina Environmental
Management Commission, and the Federal Water Pollution Control,,Act, as amended, the
Davie County Wa
is hereby authorized to discharge
Sparks Road Water
728 Sparks I
to receiving waters desgnated-a;
Dee River Basin in accord cancan e,�N
conditions set forth j&'arts I, II,
This permit shall
This permit and authorization
Signed this day
ve Julj. 1, 2019.
from a facilitv located at the
(WTP)
the Yadkin River within the Yadkin -Pee
monitoring requirements, and other
shall expire at midnight on May 31, 2024.
Linda Culpepper, Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NCO084212
WTP Class PC-1
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked. As of this permit issuance, any previously issued permit bearing this number is no longer
effective. Therefore, the exclusive authority to operate and discharge from this facility arises under
the permit conditions, requirements, terms, and provisions included herein.
Davie County Water System
is hereby authorized to:
1. continue to operate wastewater treatment facilities in support o` f potable water production
(3.0 MGD) using WTP conventional treatment technolog�[coagulation, flocculation,
sedimentation, and filtration] generating filter -backwash — 0.264 MGD) and
waste solids (sludge) at facilities utilizing;
• influent lagoon (15MG; Yadkin River�sdurce water.)
• four (4) each clarifier-filters/"'�,'
• finish -water clear well \\
• tablet dechlorination `\\
• two (2) wastewater lagoons (each 785 K\g'�a'ls)solids land app it cation
• drain line with sam le o to outfallN • flow measurement bv,ult�sonic meter`and Parshall flume
wnire
➢ Np�re cau,,
➢ ferncXsu
➢ causti [
➢ chlonne
➢ zinc-orf
➢ fluoride
sodiumydroxide (NaOH)]
dioxide [C102]
iophosphate [Zn3(PO4)2]
these facilities located at the Sparks Road Water Treatment Plant (WTP), 728 Sparks Road,
Mocksville, Davie County; and
3. discharge from said treatment works via Outfall 001, at the location specified on the
attached map, into an unnamed tributary of the Yadkin River [Stream Index 12-(86.7)], a
waterbody currently classified WS-IV within Subbasin 03-07-02 [HUC: 03040101] of the
Yadkin -Pee Dee River Basin.
Page 2 of 7

Permit NCO084212
WTP Class PC-1
PART I
A. (L) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and
monitored, and reported 1 by the Permittee as specified below:
LIMITS
MONITORING
EFFLUENT CHARACTERISTICS
REQUIREMENTS
(PARAMETER CODES)
Monthly
Daily
Measurement
Sample
Sample
Average
Maximum
Frequency
Type
Location
Flow
50050
Continuous
Recording
Effluent
Total Suspended Solids (TSS)
00530
30.0 mg/L
45.0 mg/L
i� Weekly
Grab
Effluent
^
2
Total Residual Chlorine (TRC
50060
17 Z
µ�
% �Ueekly
�
Grab
Effluent
pH (standard units)
00400
Not < 6.0 or /9A�. u
Weekly\
Grab
Effluent
Turbidity
00076
\ \
^ 2/Month\\
Grab
Effluent
Total Zinc (µg/L)
01092
36.5,µg/L\
36.5\µg2AMonthly
�,
Grab
Effluent
Total Copper (µg/L)
01042
7.88 �g%L'
\10.47 µg/L <
Monthly
Grab
Effluent
Total Fluoride
00951�
\
��� ��
Quarterly
Grab
Effluent
Total Manganese (µg/L)
011055—
�� \
\ ^�
\'Quarterly
Grab
Effluent
Total Hardness (mg/L) <
f
00900
j
�%
\ ~
Quarterly
Grab
Effluent
[as CaCO3 or Ca + Mg]
�
Total Phosphorous (TP)'(
C0665
\
\
Quarterly
Grab
Effluent
\
Total Nitrogen (TN\) (mom)
'C061\0�
Quarterly
Grab
Effluent
WET -Testing 3 �`
TGP3B
\�
Quarterly
Grab
Effluent
Footnotes: ` \
1. The Permittee shall submit discharge monitoring reports electronically using DWR's Electronic Discharge
Monitoring Report (eDMR) application system or apply for a reporting waiver [See Section A. (3.)].
2. Total Residual Chlorine (TRC) - The Division shall deem compliant all effluent TRC values reported below
50µg/L. However, the Permittee shall record and submit all values detected by North Carolina -certified test
methods (including field certified), even if these values are detected below 50µg/L.
3. Whole Effluent Toxicity (WET) testing conducted as Chronic [TGP3B] using Ceriodaphnia dubia, 7-day pass/fail
@ 90% effluent concentration, during the months of February, May, August and November [see Section A. (2.)].
Conditions:
• All samples collected shall accurately represent the effluent discharge event.
• The Permittee shall discharge no floating solids or foam visible in other than trace amounts.
Page 3 of 7

Permit NCO084212
WTP Class PC-1
A. (2.) CHRONIC TOXICITY PASS/FAIL MONITORING (QUARTERLY)
[15A NCAC 02B .0200 et seq.]
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,'oi
Environmental Scice jSe
1621 Mail Service Center
Raleigh, N.C. <276999�9-1621
Completed Aquatic Toxicity Test Forms shall be filed withthe Env
30 days after the end of the reporting period for\w�hich the rep\61- i I
Test data shall be complete and
performed in association with tl
the effluent toxicity sample m
waste stream.
Should there be no discharge
required, the Permittee will c
indicating the faaht} lname,
notation of "No Flown the
Sciences Section at the,adre
Should the Permittee fail
monitoring will begin im
revert to quarterly in the
as
Section no later than
ical/physical measurements
ise data. Total residual chlorine of
employed for disinfection of the
lity during a month in which toxicity monitoring is
.on located at the top of the aquatic toxicity (AT) test form
iumber, county, and the month/year of the report with the
form. The report shall be submitted to the Environmental
g a month in which toxicity monitoring is required, then monthly
submission of a valid test, this monthly test requirement will
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.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed no later than the last
day of the month following the month of the initial monitoring.
Page 4 of 7

Permit NCO084212
WTP Class PC-1
A. (3.) ELECTRONIC REPORTING - DISCHARGE MONITORING REPORTS
[G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and ,
program reports. The final NPDES Electronic Reporting Rule was adopted and became effective on
December 21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of
this permit (Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting Requirements [Supersedes Section D.
The Permittee shall report discharge monitoring data
Electronic Discharge Monitoring Report (eDMR),intt
Monitoring results obtained during the previous
and submitted electronically using eDMR. The
enter monitoring data and submit DMRs electTo
the state's eDMR application is compliant with
Regulation (CROMERR), permittees will be re(
the state electronically using eDMR and will be
printing, signing, and submitting on7/1
signed ori;
to the following address: \-\,,
NC DEQ / Divisj
ATTENTION:,(
1617 Mail Sergi
Raleigh, North
ntral Files\ \\
Center \
olma 276994617
the NC DWR's
,th(s) shall be sum zed for each month
[R system allows permitted facilities to
lyl�lsing the internet. Until such time that
's Cross -Media Electronic Reporting
3.to submit all discharge monitoring data to
ired-to complete the eDMR submission by
and,a copy of the computer printed eDMR
Permitting Section
If a permittee is unable\to use the�,bDMR system due to a demonstrated hardship or due to the
facility being physically, located/in d/in an area where less than 10 percent of the households have
broadband access, then a temporary waiver from the NPDES electronic reporting requirements
may be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1,
1. 1, 2, 3) or alternative forms approved by the Director. Duplicate signed copies shall be
submitted to the mailing address above. See "How to Request a Waiver from Electronic
Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month
following the issuance of the permit or in the case of a new facility, on the last day of the month
following the commencement of discharge.
Starting on December 21, 2020, the Permittee must electronically report the following
compliance monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
Page 5 of 7

Permit NC0084212
WTP Class PC-1
• Pretreatment Program Annual Reports; and
• Clean Water Act (CWA) Section 316(b) Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to Request
a Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the Permittee must identify the initial recipient at the
time of each electronic submission. The Permittee should use the EPA's website resources to
identify the initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the
entity (EPA or the state authorized by EPA to implement the NPDES program) that is the
designated entity for receiving electronic NPDES data [see 40 CVR�I27.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool
for each type of electronic submission and for each statiestructions on how to access and use
the appropriate electronic reporting tool will be available as well. Information on EPA's
NPDES Electronic Reporting Rule is found at: ��//X
Electronic submissions must start by the \at s\\ inlet\ "Reporting Requirements" section
above.
3.
The permittee may -seek a feniporary electronic deporting waiver from the Division. To obtain
an electronic reporting \waver, permrtteemustt first submit an electronic reporting waiver
request to the Division. Requests f l temporary,,electronic reporting waivers must be submitted
in writing to tle Division for�wntten approval at least sixty (60) days prior to the date the facility
would be required under this pe it to begin submitting monitoring data and reports. The
duration of a temporary waiver shall not exceed 5 years and shall thereupon,expire. At such
time, monitoring data and reports)shall be submitted electronically to the Division unless the
Permittee re -applies for, -is granted a new temporary electronic reporting waiver by the
Division. Approved electronic reporting waivers are not transferrable. Only permittees with an
approved reporting waiver request may submit monitoring data and reports on paper to the
Division for the period that the approved reporting waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found
on the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Page 6 of 7

Permit NC0084212
WTP Class PC-1
4. Signatory Requirements [Supplements Section B. (11.) (b); Supersedes Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in
Part II, Section B. (1 l.)(a) or by a duly authorized representative of that person as described in
Part II, Section B. (I 1.)(b). A person, and not a position, must be delegated signatory authority
for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North
Carolina's eDMR system, registering for eDMR and obtaining an eDMR user account, please
visit the following web page:
htlp://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using'the%state's eDMR system shall
make the following certification [40 CFR 122.22]. NO OTHEWSTATEMENTS OF
CERTIFICATION WILL BE ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system design to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is,rt�o'he best of.� y knowledge and belief, true, accurate,
and complete. I am aware that there are s�igni cant penalties, for submitting false information,
including the possibility of f nes and.imprison�for kno�ivivviolations. "
5. Records Retention [Supplements_Section D., (6.)1
v
The Permittee shall retain records of —all Dis he arge�Momtonng Reports, including eDMR
submissions��These records or copies shall be oaintained for a period of at least 3 years from
the date of the`report. This period maybe extended by request of the Director at anytime [40
CFR 122.41]. 7� \ \ 7\�
Page 7 of 7

'Ll� - 1� -
Yadkin River
(flows E)
I1
11
�1455�
- t•
786
Outfall 001
(flows north)
Lat: 36° 02' 03"
Long: 80' 29' 59"
1
Approximate Property'
Boundary
Davie County Water System
Sparks Road WTP, Mocksville
Flows: Not limited
USGS Quads: Farmington/Clemmons State Grids: C 16SE / C17SW
Receiving Stream: UT to the Yadkin River Stream Class: WS-IV
Stream Seement: 12-(86.7) HUC: 03040101
Drainage Basin: Yadkin— Pee Dee Basin Sub -Basin: 03-07-02
IV-7
Sparks Road
Facility
Location
not to scale
North 11!
DES Permit NCO084212
Davie County