NC0084212_Permit Issuance_20140627

NPDES DOCUMENT !;CANNINO COVER SNEEIN
NPDES Permit:
NC0084212
Sparks Rd WTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
June 27, 2014
This document is printed on reuse paper -Ignore any
content on the resrerse side

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Resources
Pat McCrory John E. Skvarla, III
Governor Secretary
June 27, 2014
Johnny Lambert, Director
Davie County Water System
298 East Depot Street
Mocksville, North Carolina 27028
Subject: Issuance of NPDES Permit NCO084212
Sparks Road Water Treatment Plant (WTP)
728 Sparks Road, Mocksville
Davie County
Dear Mr. Lambert:
Having approved your application to renew the subject discharge permit, the Division of Water Resources
(DWR of the Division) hereby issues the attached. We issue this permit pursuant to the requirements of North
Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S.
Environmental Protection Agency (EPA) dated October 15, 2007 (or as subsequently amended).
Changes for Renewal. The Division updated your permit in accord with current permitting strategies for potable
water treatment plants (WTPs) applying conventional YYTP treatment technology. We have also updated your
facility description and site map, and have added test -method parameter codes for your convenience [see Section
A. (1.)]. Please note that recent Whole Effluent Toxicity (WET) test failures suggest that this effluent may be
harmful to the aquatic environment. Therefore the Division has included a Special Condition that may require
additional action [see permit Section A. (4)].
Changes From the Permit DRAFT. The Division has reevaluated flow for this facility. Considering regular
discharges in excess of 0.500 MGD, we have readjusted the draft monitoring frequencies in accord with
statewide permitting strategy for conventional treatment technology: thus monitoring for TSS, TRC, Turbidity,
and pH has increased from 2/Month to Weekly; monitoring for Total Manganese, and Total Fluoride
monitoring has decreased from Monthly to Quarterly. We regret any confusion or inconvenience this may have
caused your organization.
Implementing Electronic Discharge Monitoring Reports(eDMRs). Please be advised that the Division will
implement an electronic Discharge Monitoring Report (eDMR) program, in accord with pending requirements
by the Environmental Protection Agency (EPA). We have included the details required to implement the eDMR
program in this permit [see permit Special Condition A. (2.)].
Proposed federal regulations require electronic submittal of all DMRs and specify that, if North Carolina does
not establish a program to receive such submittals, Permittees must then submit eDMRs directly to EPA. For
more information on eDMRs, registering for eDMR submittal, and obtaining an eDMR user account, please
visit DWR's webpage:
h!W://portal.ncdenr.org/web/wq/admin/boglipu/edmr.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service:1-877-623-6748
Intemet www.ncwaterquality.org
An Equal Opportunity 1 Affirmative Acgon Employer

For information on EPA's proposed NPDES Electronic Reporting Rule, please visit EPA's website:
bft://www2 epa gov/compliance/nronosed-npdes-electronic reporting rule
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of
Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless
such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division may
modify, revoke, and/or reissue this permit. This permit does not affect your legal obligation to obtain
other permits required by the Division of Water Quality, the Division of Land Resources, the Coastal
Area Management Act, or any other Federal or Local governmental permit.
If you have any questions, please contact Joe R. Corporon, L.G. at [ioe.corporongricdenr.eovl or call
his direct line [phone].
ncer y,
4
Thomas A. Reeder, Director
Division of Water Resources
Enclosure: NPDES Permit NCO084212 (Issuance Final)
he: WSRO/SWPS Supervisor, Corey Basinger
Central Files
NPDES Program Files
ec: DWR/WSRO, Corey Basinger
ATB Susan Meadows and Carol Hollencamp
Davie County Water Systems, Johnny Lambert [[e-mail]]
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St Raleigh, North Carolina 27604
Phone: 91MO7-63001 FAX: [phone] Customer Service: 1-877-623-6748
Internet: www.ncvvalerquality.org
An Equal Opportunity 1 Affirmative Action Employer

NPDES Permit NCO084212
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
DES)
In compliance with the provisions of North Carolina General Statute 143-215.1, 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 Water System
is hereby authorized to discharge wastewater from a facility located at the
Sparks Road Water Treatment Plant (WTP)
728 Sparks Road, Mocksville
Davie County
to receiving waters designated as an unnamed tributary to the Yadkin River within the Yadkin -Pee
Dee River Basin in accordance with effluent limitations, monitoring requirements, and other
conditions set forth in Parts I, II, III and IV hereof.
This permit shall become effective August 1, 2014.
This permit and authorization to discharge shall expire at midnight on May 31, 2019.
Signed this day June 27, 2014.
Th . Reeder, Director
D ision of Water Resources
By Authority of the Environmental Management Commission

Permit NCO084212
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 of potable water production (3.0
MGD) using WTP conventional treatment technology [coagulation, flocculation, sedimentation,
and filtration] generating filter -backwash wastewater (ave. —1.24 MGD) and waste solids
(sludge) at facilities described as;
• influent lagoon (15MG; Yadkin River source water)
• four (4) each clarifier -filters
• finish -water clear well
• tablet dechlorination
• two (2) wastewater lagoons (each 785 K gals)
• solids land application
• drain line with sample port to outfall
• flow measurement by ultrasonic meter and Parshall flume
while utilizing the chemicals
➢ pre -caustic carbon [C]
➢ ferric sulfate [Fe2(SO4)31
➢ caustic [sodium hydroxide (NaOH)]
➢ chlorine dioxide [C102]
➢ zinc -orthophosphate [Zn3(PO4)21
➢ fluoride (F)
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 of the Yadkin -Pee Dee
River Basin.
Page 2 of 6

Permit NC0084212
PART
A. (L) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this permit and lasting until expiration, the
Perrittee is authorized to discharge from Outfall 001. Such discharges shall be limited and
monitored, and reported I by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
(PARAMETER CODES)
LIMITS
MONITORING REQUIREMENTS t
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow
50050
Continuous
Recording
Effluent
Total Suspended Solids (TSS)
00530
30.0 mg/L
45.0 mg/L
Weekly
Grab
Effluent
2
Total Residual Chlorine (TRC)
50060
17
Weekly
Y
Grab
Effluent
Turbidity 3
00076
Weekly
Grab
Effluent
pH /
00400
Not <6.0 nor> 9.0
standard units
Weekly
Grab
Effluent
Total MahganeseV
01055
Quarterly
Grab
Effluent
Total Fluoride
00951
Quarterly
Grab
Effluent
T
Total Colill5rcy
01042
Quarterly
Grab
Effluent
Total Zinc
01092
Quarterly
Grab
Effluent
Total Phosphorous (TPV
C0665
Quarterly
Grab
Effluent
Total Nitrogen
C0610
Quarterly
Grab
Effluent
WET -Testing h
TGP3B
Quarterly
Grab
Effluent
Footnotes: A'0
1. No later than April 1, 2015, 270 days from the permit effective date, begin submitting electronic discharge
Monitoring Reports (eDMRs) using DWR's eDMR application system, or apply for a 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 detected below 50µg/L.
3. Turbidity - Discharge from this facility shall not cause receiving -stream turbidity to exceed 50 NTU. If natural
background turbidity exceeds 50 NTU, this discharge shall not increase receiving stream turbidity.
4. Parameter to be sampled concurrently with WET -test sampling.
5. 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.
• This permit includes a WET -test compliance Special Condition [see Section A. (4.)].
Page 3 of 6

Permit NCO084212
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.
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 6

Permit NCO084212
A. (3.) ELECTRONIC REPORTING - DISCHARGE MONITORING REPORTS
Proposed federal regulations require electronic submittal of all discharge monitoring reports
(DMRs) and specify that, if a state does not establish a system to receive such submittals, then
Permittees must submit DMRs electronically to the Environmental Protection Agency (EPA). The
Division anticipates that these regulations will be adopted and will begin implementing in 2013.
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 [Supersedes Part H, Section D. (2.) and Section E. (5.) (a)]
Beginning no later than April 1, 2015, 270 days from the effective date of this permit, the
Permittee shall begin reporting discharge monitoring data electronically using the NC DWR's
Electronic Discharge Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month
and submitted electronically using eDMR. The eDMR system allows permitted facilities to
enter monitoring data and submit DMRs electronically using the internet. Until such time that
the state's eDMR application is compliant with EPA's Cross -Media Electronic Reporting
Regulation (CROMERR), Permittees will be required to submit all discharge monitoring data to
the state electronically using eDMR and will be required to complete the eDMR submission by
printing, signing, and submitting one signed original and a copy of the computer printed eDMR
to the following address:
NC DENR / DWR / Information Processing Unit
ATTENTION: Central Files / eDMR
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a Permittee is unable to use the eDMR system due to a demonstrated hardship or due to the
facility being physically located 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.
Requests for temporary waivers from the NPDES electronic reporting requirements must be
submitted in writing to the Division for written approval at least sixty (60) days prior to the date
the facility would be required under this permit to begin using eDMR. Temporary waivers shall
be valid for twelve (12) months and shall thereupon expire. At such time, DMRs shall be
submitted electronically to the Division unless the Permittee re -applies for and is granted a new
temporary waiver by the Division.
Page 5 of 6

Permit NCO084212
Information on eDMR and application for a temporary waiver from the NPDES electronic
reporting requirements is found on the following web page:
http://portal.ncdenr.org/web/wq/admin/bog/ipu/edmr
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.
2. Signatory Requirements [Supplements Part H, Section B. (11.) (b) and supersedes Section B. (11.)
(d)]
All eDMRs submitted to the permit issuing authority shall be signed by a person described in
Part II, Section B. (I 1.)(a) or by a duly authorized representative of that person as described in
Part H, Section B. (11.)(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:
hq://portal.ncdenr.orWweb/wg/admin/bog/ipu/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall
make the following certification [40 CFR 122.22]. NO OTHER STATEMENTS 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 designed 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, to the .best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations. "
3. Records Retention [Supplements Part H, Section D. (6.)]
The Permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions.
These records or copies shall be maintained for a period of at least 3 years from the date of the report.
This period may be extended by request of the Director at any time [40 CFR 122.41].
A. (4.) PERMIT RE -OPENER - WHOLE EFFLUENT TOXICITY MONITORING
This facility's history of Whole Effluent Toxicity (WET) monitoring indicates that discharge to surface
waters may be toxic to the aquatic environment. The Division of Water Resources therefore may reopen this
permit, or request by letter that the Permittee take further action. This action may include additional metals
testing, a Toxicity Identification Evaluation / Toxicity Reduction Evaluation (TIE/TRE), additional
assessment of discharge alternatives, and/or review of waste treatment alternatives.
Page 6 of 6

,' 1! M
1���
It
11 Yadkin River
R
(flowing cast)
ApK"1 N
! r
T
IA
Ik
14
°1 �ti��
7 r \ I li Outfall001
\ o I 11 (flows north)
Long: 800 29' 59" �
,C
�I
11 �\ f
Ilo � '• ;'�JB f � ( �
it II I` Sparks Road
1455
786 f � + � -- —� �� O Approximate Property
Boundary U
Davie County Water System Facility
Sparks Road WTP, Mocksville AS Location
Flows: Potable 3.0 MGD; W W 1.350 MGD not to scale
USGS Ounds: Faunington/Clemmons State Grids: C16SE/C17SW
Receiving Stream: UT to the Yadkin River Stream Class: WS-IV
Stream Segment 12-(86.7) BUC: 03040101 i NOYtjZ NPDES Permit NCO084212
Drainage Basin: Yadkin —Pee Dee Basin Sub -Basin: 03-07-02
Davie Coun

NORTH CAROLINA
FORSYTH 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 D.H. Stanfield, who being duly sworn, deposes and says: that he is
Controller of the Winston-Salem Journal, engaged in the publishing of a
newspaper known as the Winston-Salem Journal, published, issued and
entered as second class mail in the City of Winston-Salem, in said County and
State: 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 Winston-Salem Journal on the following dates:
May 9, 2014
and that the said newspaper in which such notice, paper document, or legal
advertisement was published was, at the time of each and every such
publication, a newspaper meeting all the requirements and qualifications of
Section 1-597 of the General Statutes of North Carolina and was a qualified
newspaper within the meaning of Section 1-597 of the General Statutes of
North Carolina.
This 9th day of May, 2014 d,yW
(signature bfp#rso)z making affidavit)
Sworn to and subscribed before me, this 9th day of May, 2014
Notevyyuglic
My Commission expires: September 28, 2015
KIMALEY JOHNSON
NOTARY PUBLIC
FORSYTH COUNTY
STATE OF NORTH CAR L A
MY COMMISSION EXPIR
PUBLIC NOTICE
Nortb Carolina Environmental
Management Commission/NPDES Unit
1617 Mail Service Center
Raleigh. NC 276"-1617
Notice of Intent to Issue a
NPDES Wastewater Permit
WSJ: May 9, 2014

DENR/DWR/NPDES
EXPEDITED FACT SHEET - NPDES PERMIT DEVELOPMENT
NPDES Permit NCO084212
Corporon, L.G., Expedited Permitting and Compliance Unit 25Apr2014
Facility Information
Facility Name
Sparks Road WTP
Applicant
Davie County Water System
Contact
Director: Johnny Lambert [e-mail]]
Applicant Address
298 /East Depot Street, Mocksville 27028
Facility Address
728 Sparks Road, Mocksville 27028
Permitted Flow (MGD)
Not limited
Type of Waste
Potable WTP / filter backwash (Conventional treatment Technology).
Facility Class
I County
Davie
Facility Status
Renewal
I Regional Office
WSRO
Stream Characteristics
Receiving Stream / Basin
UT to Yadkin River
Stream Classification
WS-1V
Stream Segment
12-(86.7)
Drainage Basin
Yadkin -Pee Dee
River Basin
Summer 7Q10 (cfs)
_
Subbasin
03-07-02
Winter 7Q 10 (cfs)
_
Use Support
Yes
30Q2 (cfs)
303(d) Listed
No
Average Flow (cfs)
_
State Grid(s)
D17SE / C17SW
IWC (%)
100 %
USGS Topo Quad
Farmington /
Clemmons, NC
Facility Summary — This WTP employs conventional treatment technology [coagulation, flocculation,
sedimentation, and filtration] to produce potable water at a system -design rate of 3.0 MGD. Previous permit
required installation of "continuous recording" by March 1, 2011. Filter -backwash discharge rates vary over
time, but reported for the past two years, average 1.241 MGD with a maximum at 2.355 MGD; minimum
0.786 MGD [years 2012-2013; n = 671].
WASTE -WATER Flow History
Jan2009 - Mat-2014
YEAR
n
AVE
MAX
MIN
2009
52
0.158
0.326
0.021
2010
51
0.171
0.326
0.043
2011
290
1.253
2.173
0.075
2012
306
1.481
2.335
0.786
2013
365
1.340
1.996
0.960
2014 (thru Mar)
90
1.142
1.352
0.855
Fact Sheet
Renewal 2014 -- NPDES Permit NCO084212
Page 1 of 1

Summary of Renewal Changes:
1. Within 270-days the Permittee must to apply for electronic submittal of monthly DMRs (eDMRs).
2. Updated facility description [Supplement to Cover Sheet] ; updated Vicinity Map, Lat. / Long;
3. Added parameter codes to effluent table, Section A. (1.);
4. WET testing continued; required of facilities employing conventional treatment technology.
5. Permittee will be required to address toxicity with additional study; therefore, included Special
Condition [see Section A. (4)]. Quarterly WET test history over the past permit cycle shows 19 test
events (TGP3B); Pass =16; Fail = 3 (in the past year, including the most recent 181762014).
6. The renewal application states that the Permittee does not use alum / aluminum sulfate therefore
monitoring for aluminum will be discontinued for renewal.
Reasonable Potential Analysis (RPA). DWR conducted an RPA on data for the parameters Al, Mn, Fe, Cu,
F. and Zn (see attached). Only Cu, Fe, and Zn show RP; action level parameters, therefore monitoring only
is required, no limits [see Section A. (1.)].
Turbidity Data Jan2010-Mar2014 (n = 106): Max = 140 ntu; min = 0.5 ntu; ave. = 4.44 ntu
Fact Sheet
Renewal Apr2014 -- NPDES NC0084212
Page 2 of 2

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Davie County WTP 2014 Freshwater RPA - 95% Probability/95% Confidence
NCO084212 MAXIMUM DATA POINTS = 58
Qw (MGD) = 2.00 WWTP/WTP Class:
IQ 1 OS (cfs) = 0.00 IWC @ I Q I OS = 100.00%
7QIOS (cfs) = 0.00 IWC @ 7Q10S = 100.00%
7QIOW (cfs)= 0.00 IWC cQt 7QIOW = 100.00%
30Q2 (cfs) = 0.00 IWC a 30Q2 = 100.00%
Avg. Stream Flow, QA (cfs) = 0.00 IWC a QA = 100.00%
Receiving Stream: UT to the Yadkin River Stream Class: WS-IV
Outfall 001
Qw =1.996 MGD
Flow Qw: max reported in the last 2 years
PARAMETER
STANDARDS & CRITERIA (2)
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
(1)
cy
IL
z
NC WQS / Applied 'h FAV /
t1 # Det. Max Pred Allowable Cw
Chronic Standard Acute
Cw
Acute: - 7.3
RP for AL(Cu,Zn,Ag,Fe,CI) - apply Quarterly
Copper (AL)
NC
7 FW 7.3
ug/L
17 0
39.5
- __
_ _ - _ _ _ _ _
Monitoring in conjunction with TOX Test
_ - _ -
Chronic: 7.0
RP for AL(Cu,Zn,Ag,Fe,CI) - apply Quarterly
7 values > Allowable Cw
Monitoring in conjunction with TOX Test
Acute: NO WQS
Fluoride
NC
1800 FW
ug/L
17 16
622
---------------------------------------------
Chronic: 1,800
No RP, Predicted Max, 2: 40% of Allowable Cw.
No value > Allowable Cw
defer to LTMP
Acute: 67
RP for AL(Cu,Zn,Ag,FeCI) -apply Quarterly
Zinc (AL)
NC
50 FW 67
ug/L
17 17
114
- _ _ _ _ _ _ _ _ _ -
Monitoring in conjunction with'TOX Test -------
Chronic: 50
RP far AL(Cu,Zn.Ag,Ee,CI) - apply Quarterly
2 values > Allowable Cw
Monitoring In conjunction with TOX Test
Acute: NO WQS
Manganese
NC
200 WS
µg/L
17 17
2.6
----------------------------------------------
Chronic: 200
NO RP, Predicted Max < of Allowable Cw - NO
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Iron
NC
1000 WS
µg/L
50 50
1,133
.............................................
Chronic: 1000
RP for AL(Cu,Zn,Ag,Fe,CI)'- apply Quarterly
2 values > Allowable Cw
Monitoring in conjunction with TOX Test
Acute: 8000
No RP, Predicted Max < 60% of Allowable Cw - No
Aluminum
NC
6500 WS 8000
µg/L
19 12
114
_ _ _ _
Monitoring required _ _ --------------
- _ _ _ -
Chronic: 6500
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
84212 RPA Davie Co WTP Apr201411.xlsx, rpa
Page 1 of 1 4/25/2014

2014 Freshwater RPA - 95% Probability/95% Confidence
MAXIMUM DATA POINTS = 68
® REQUIRED DATA ENTRY
O
Table 1. Project Information
❑ CHECK IF HQW OR ORW WQ5
Facility Name
W WTPIWTP Class
NPDES Permit
Outfall
Flow, Ow (MGD)
Receiving Stream
Stream Class
7Q10s (cfs)
7Q10w (cfs)
3042 (cfs)
QA (cfs)
1410s (cfs)
Data Source(s)
❑ CHECK TO APPLY MODEL
Davie County WTP
NCO084212
001
1.996
UT to the Yadkin River
WS-IV
0.00
0.00
0.00
0.00
0.00 .-
BIMS DMR data - Jan20l O-Ma2014
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
frnni nrrur If data enter does not
meet input criteria.
Flow Qw: max reported in the last 2 years
Paro1
Par02
Par03
Par04
�Par05
Par06
Par07
Parma
Par09
Par19
Par11
Par12
Par13
Par14
Paris
ParI6
Par17
Pari8
Paris
Par20
Par21
Pa22
Table 2. Parameters of Concern t2
Name Type Chronic MoQrer Acute PQL Units f
El
13
❑
Ell
Copper (AL)
NC
7
FW
7.3
ug/L
❑
El
Fluoride
NC
1,800
FW
ug/L
❑
El
El
El
11711
El
Zinc (AL)
NC
50
FW
67
uglL
❑
Manganese
NC
200
WS
pg/L
❑
Iron
NC
1000
WS
pg/L
❑
El
F777Aluminum
NC
6500
WS
8000
pg/L
❑
84212 RPA Davie Co WTP Ap201411.x1sx, input
4/25/2014

REASONABLE POTENTIAL ANALYSIS
9
Copper (AL)
Date Data
BDL=112DL
2010 <
10
5
2010 <
10
5
2010 <
10
5
2010 <
10
5
2011 <
10
5
2011 <
10
5
2011 <
10
5
2011 <
10
5
2012 <
10
5
2012 <
10
5
2012 <
20
10
2012 <
50
25
2013 <
50
25
2013 <
50
25
2013 <
50
25
2013 <
50
25
2014 <
50
25
Uso"PASTE SPECIAL
Veluos" then "CO
. Maximum 4a
points = 6
Results
Sld Dev.
9.7014
Mean
12.3529
C.V.
0.7854
n
17
Mult Factor =
1.58
Max. Value
25.0 ug/L
Max. Fred Cw
39.5 ug/L
11
Fluoride
Date Data
BDL=1/2DL
Results
-
2010
320
320
Still Dev.
111.1994
2010
300
300
Mean
296.0588
2010
460
460
C.V.
0.3756
2010
490
490
n
17
2011
350
350
2011
350
350
Mult Factor =
1.27
2011
340
340
Max. Value
490.0 ug/L
2011
320
320
Max. Pred Cw
622.3 ug/L
2012
300
300
2012
300
300
2012 <
10
5
2012
250
250
2013
221
221
2013
307
307
2013
329
329
2013
268
268
2014
123
123
_2.
84212 RPA Davie Co WTP Ap201411.xlu, data
4/25/2014

REASONABLE POTENTIAL ANALYSIS
18
Date Data
1
2010
2
2010
3
2010
4
2010
5
2011
6
2011
7
2011
8
2011
9
2012
10
2012
11
2012
12
2012
13
2013
14
2013
15
2013
16
2013
17
2014
18
19
20
21
22
23
24
25
26.
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47'
48
49
50
51
52
53
54
55
56
57
58
Zinc (AL)
BDL=il2DL
40 40
17 17
10 10
22 22
32 32
16 16
17 17
34 34
62 62
13 13
39 39
50 50
50 50
82 82
so 50
50 50
47 47
"PASTE SPECIAL 19
res"then"COPY"
Maximum data
poin s = SB
Results 00011116_
Std Dev.
19.7544
Mean
37.1176
C.V.
0,5322
n
17
Mult Factor =
1.39
Max. Value
82.0 ug/L
Max. Fred Cw
114.0 ug/L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1s
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Date Data
2010 0.039
2010 0.246
2010 0.338
2010 0.131
2011 0.062
2011 0.12
2011 0.341
2011 0.491
2012 0.149
2012 0.078
2012 0.35
2012 0.28
2013 1.44
2013 0.26
2013 0.21
2013 0.42
2014 0.11
BDL=1/2DL
0.039
0.246
0.338
0.131
0,062
0.12
0.341
0.491
0.149
0.078
0.35
0.28
1.44
0.26
0.21
0.42
0.11
Usc"PASTE SPECIAL
Values" then "COPY"
.Maximum data
points = 88
Results
Std Dev.
0.3
Mean
0.3
C.V.
1.1
n
17
Mult Factor = 1.78
Max. Value 1.44 Ng/L
Max. Fred Cw 2.56 Ng/L
84212 RPA Davie Co WTP Ap201411.x1sx, data
-3- 4/25/2014

REASONABLE POTENTIAL ANALYSIS
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Iron
Date Data
BDL=1/2DL
Results NIE?:
,"
2009
900
900
Std Dev.
243
2009
1000
1000
Mean
506
2009
1100
1100
CN.
0.5
2009
1100
1100
n
48
2009
800
800
2009
900
900
Mult Factor =
1.03
2009
300
800
Max. Value
1100
pg/L
2009
800
800
Max. Fred Cw
1133
pg/L
2009
800
800
2009
600
600
2009
300
600
2009
500
600
2009
500
500
2009
700
700
2009
400
400
2009
500
500
2009
500
500
2009
400
400
2009
200
200
2009
400
400
2009
400
400
2009
400
400
2009
300
300
2009
200
200
2009
100
100
2009
200
200
2009
200
200
2009
300
300
2009
300
300
2009
200
200
2009
300
300
2010
212
212
2010
625
625
2010
447
447
2010
552
552
2011
356
356
2011
536
536
2011
408
408
2011
453
453
2012
528
528
2012
370
370
2012
0
ERR
2012
0
ERR
2012
330
630
2012
540
540
2013
430
430
2013
440
440
2013
530
530
2013
450
450
2014
280
280
22
Aluminum
Date Data
BDL=1/2DL
Results
-
1
2010
39.
39
Sid Dev.
22.1
2
2010
50.
50
Mean
36.9
3
2010
50.
50
C.V.
0.6
4
2010
82.
82
n
19.0
5
2011
50.
50
6
2011
50.
50
Mult Factor =
1.4
7
2011
47.
47
Max. Value
82.0
8
2011
50.
50
Max. Fred Cw
114.0
9
2012
65.
65
10
2012
37.
37
11
2012
11
11
12
2012
32
32
13
2012 <
101
50.5
14
2012 <
32.
16
15
2013 <
82.
41
16
2013 <
31.
15.5
17
2013 <
28.
14
18
2013 <
1.
0.5
19
2014 <
1.
0.5
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
_4_
84212 RPA Davie Cc WTP Apr201411.xlsx, data
4/25/2014

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number INCO084212
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 Davie County Water System
Facility Name Sparks Road WTP
Mailing Address 298 East Depot St.
ECEIVED/DENR/DWR
city Mocksville
APR 2 4 2014
State / Zip Code NC, 27028
Water Resources
PermItting Section
Telephone Number [phone]
Fax Number [phone]
e-mail Address [e-mail]
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road 728 Sparks Road
City Mocksville
State / Zip Code NC, 27028
County Davie
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 ORQ
Name Davie County Public Utilities
Mailing Address 298 East Depot St.
City Mocksville
State / Zip Code ' NC, 27028
Telephone Number [phone]
Fax Number [phone]
4. Ownership Status:
Page I of 4 Version 5/20I2

Davie County Public Utilities
298 East Depot Street
Mocksville, NC 27028
4l9/14
Mr. Wren Thedford
NCDENR/DWR/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Renewal of NPDES Permit NCO084212
Sparks Road WTP Wastewater Discharge
Dear Wren:
Please renew the above reverenced NPDES permit for the Davie County Sparks
Road WTP wastewater discharge. The only changes to facility processes have
involved instrumentation and control enhancements Including the 2010 addition
of a flow monitoring station at the wastewater dechlorination and discharge point
Incorporating SCADA integration and flow tracking.
Attached are one signed original and two copies of each of the following:
1. Cover letter;
2. Application Form;
3. Sludge Management Narrative
4. Facility Location Exhibit;
5. Facility Process Schematic.
Th you,
T;)
Johnny Lambert, Director
Attachments

NPDES PERMIT APPLICATION - SNORT FORM C - WTP
For discharges associated with %eater treatment plants
Federal ❑ State ❑ Private ❑ Public X
S. Type of treatment plant:
X 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)
Yadkin River Surface Water
7. Describe the treatment processes) for the raw water:
Presedimentation, Coagulation (ferric sulfate), Clarification, Filtration, Disinfection
(chlorine gas) and Discharge to the Clearwell.
S. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
The wastewaters are clarifier and filter backwash conveyed to two treatment lagoons of
785,000 gallons each which are decanted through dechlorination (sodium sulfite tablets)
and now measurement to a ditch tributary to the Yadkin river.
9. Number of separate discharge points: 1
Outfall Identification numbers) 001
10. Frequency of discharge: Continuous X Intermittent Q
If intermittent:
Days per week discharge occurs: Duration:
11. Plant design potable flowrate 3 MGD
I
Backwash or reject flow .26_ 4 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude): .
Unnamed tributary to Yadkin River. See attached exhibit.
Page 2 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
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 X
Iron sulfate / ferrous sulfate Yes X No
Fluoride Yes X No
Ammonia nitrogen / Chloramines Yes No X
Zinc -orthophosphate or sweetwater CP1236 Yes X No
List any other additives below:
Activated Carbon
Sodium Sulfite for wastewater dechlorination
14. is this facility located on Indian country? (check one)
Yes ❑ No X
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].
D Solids Handling Plan
16. NEW Applicants
Information needed in addition to items 1-15:
New applicants must contact a permit coordinator with the NCDENR Customer
Service Center.
Johnny Was the Customer Service Center contacted? El 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.
Johgny Lambert Utilities Director
Pr' d name of Person Signing Title
Date
Page 3 of 4 Version 5/2012

Davie County Public Ufihties
Sparks Road water Treatment Plant
Sludge Handling Plan
The Sparks Road WTP has two parallel 785PO-gallon filler
backwash lagoons. The lagoons provide long-term storage of sludge
developed during clariflOr flushing and filter backwash operations. As
sludge is added to the lagoons the chemical solids are settled by gravity.
The supernatant is discharged through the overflow -supernatant pipe to a
man, made ditch that flows to an unnamed tributary of the Yad do River.
Sludge depth is monitored its each lagoon and lagoons are designed to
last up to 10 years at the expected plant sludge disposal rate before solids
have to be removed. Once lagoons are classified as full, sludge in the
lagoons is dredged and land applied on neighboring farm. Melds. Prior to
dredging a land applioation permit is acquired and the sludge is analyzed to
assure it is safe to apply, The sludge removal is contracted out to a
specialized private company to assure that all state and federal laws would
be followed though out the sludge removal process.
In summary the sludge handling at this facility happens only once
ever 10 years and is contrasted out for land application.

TERMINAL
RESE13VOIR
INFLUENT FROM
YADKIN RIVER
------------------------- 15 MG
f
e
s
QHEMICAL ADDITION
PRE -CAUSTIC CARBON
FERRIC SULFATE, CAUSTIC ;
�f.
i 1 1
CHEMICAL ADDITION
CHLORINE, CAUSTIC, I
PHOSPHATE, FLUORIDE
DISTRIBUTION
SYSTEM �T
< 16"
r _ T
ZAMAll
WTP—SPARKS14 FLW
GREY ENGINEERING, INC.
Civil Design and Surveying
P.O. Box 8 Mocksvilla, N.C. 27028
greyen2"ering.com (336)751--2110
DRAWN BY: G. BULLARD I PROD. NO.: 202.029.GE
DESIGN BY: G. BULLARD DATE: 4/09/14
EINISIJED.
WATER
CLEARWELL
1 MG
DAVIE
CHEMICAL
ADDITIONFLOW
SODIUM
SULFITE
MEASUREMENT
t
EFFLUENT
TRIBUTARY TO
YADKIN RIVER
WASTEWATER
LAQOONS
785,000 GALS
EACH
i f
... ...� .-. J
1
LEGEND
EFFLUENT
-- FINISHED WATER
--•------ . - INFLUENT
•-• SLUDGE
--• •- WASTING/SCUM
COUNTY
SPARKS WTP PROCESS SCHEMATIC - EMBIY
3.0 MGD CAPACITY I OF I

Davie County Public Utilities
Spanks Road Water Treatment Plant
Sludge Handling Plan
The Sparks Road wTP has two parallel 7851,000-gallon filter
backwash lagoons. The lagoons provide long -terns storage of sludge
developed during clarifier flushing and filter backwash operations. As
sludge is added to the lagoons the chemical solids are settled by gravity.
The supernatant is discharged through the overflow -supernatant pipe to a
man made ditch that flows to an uapEname p p p•
d tributary of the Yam Raver.
Sludge depth is monitored in each lagoon and lagoons are designed to
last up to 10 years at the expected plant sludge disposal r
p gate before solids
have to be removed. Once lagoons are classified as full., sludge in the
.lagoons is dredged and land applied on neighboring farm Melds. Prior to
dredging a land application permit is acquired and the sludge is analyzed to
assure it is safe to apply. The sludge removal is contracted out to a
specialized private company to assure that aU state and federal Laws would
be followed though out the sludge removal process.
In summary the sludge handling at this facility happens only once
ever 10 years and is contracted out for land application.