NC0088552_Draft Permit_20190710

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ROY COOPER4
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Governorvt. H�
MICHAEL S.REGAN ,
Secretary '
LINDA CULPEPPER NORTH CAROLINA
Director Environmental Quality
July 10, 2019
Mr. Shannon V. Becker,President
c/o Amanda Berger
Aqua North Carolina,Inc.
202 Mackenan Court
Cary,North Carolina 27511
Subject: Draft NPDES Permit NC0088552
Colonial Woods Subdivision—Wells#1 &#2 WTP
Physical Chemical Not Classified WPCS
Surry County
Dear Mr. Becker:
The Division has reviewed your request to renew the subject permit.Please review this draft carefully to
ensure your thorough understanding of the information,conditions and requirements it contains.
The Division understands that you have made no significant changes to your facility since the last permit
renewal.The draft permit includes the following significant changes from the existing permit:
1. The facility map has been updated.
2. Regulatory citations have been added.
3. The facility classification Physical Chemical Not Classified WPCS was added to the effluent page.
4. For Outfalls 001 &002,the limit for Total Residual Chlorine(TRC)under zero flow conditions is set
at the water quality standard of 17 ug/1 for Class C waters. Please note that Footnote 2 stipulates the
following: The Division shall consider compliant all TRC effluent values reported below 50 µg/L.
However,the Permittee shall continue to record and submit all values reported by North Carolina-
certified laboratory methods(including field certified),even if these values fall below 50 µg/L.
5. The NC 2007-2014 Water Quality Standard(WQS)Triennial Review was approved by the NC
Environmental Management Committee(EMC)on November 13,2014.The US EPA subsequently
approved the WQS revisions on April 6,2016 with some exceptions.The NC Division of Water
Resources is required to implement the new dissolved metal standards in all permits public noticed
after April 6,2016.
The new standards for most metals include acute standards.Furthermore,the freshwater standards
for several metals are expressed as the dissolved form of the metals,and seven metals have
hardness-dependent equations. As a result,the Division will need site-specific effluent hardness
data and instream hardness data,upstream of the discharge, for each facility monitoring these
metals in order to calculate permit limitations.The metal of concern for this permit renewal is
Zinc.
To evaluate dissolved Zinc,a Reasonable Potential Analysis(RPA)was conducted using data
from DMRs(May2014—Oct2018) [see attached RPA spreadsheets for Outfall 0011 Results
indicated a reasonable potential to exceed the new dissolved metals standard for Zinc.
Consequently,the following daily maximum limits(acute standard)and monthly average limits
(in this case the acute standard)for Total Zinc could be applied for this permit renewal:
DE 4 North Carolina Department of Environmental Quality I Division of Water Resources
0) 512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
al Errollerrlil Ibil/N /'/ 919.707.9000

Mr.Becker
July 10,2019
Page 2 of 2
Parameter Outfall Monthly Average Limit Daily Maximum Limit
Zinc 001 No Limit No Limit
Zinc 002 187.8 µg/L 187.8 µg/L
Please note that the hardness-dependent water quality standard for zinc typically results in a more
stringent permit limit for the acute total allowable metal verses the chronic value.In this situation,
we use the acute total allowable metal concentration(permit limit)as the limitation for both the
Daily Maximum and the Monthly Average.
Hardness data received on July 2,2019 was used for the calculation of these limits. Since this
facility discharges under zero flow conditions a value of 0 was entered for all stream flow data.
Please note that under zero flow conditions the RPA defaults to a value of 25 mg/L for the
upstream Total Hardness.Additionally,the maximum monthly average flow of 0.0009 MGD
from November 2015 to October 2018 (3 years)data was used as the effluent flow.For a
summary of this information,please see the attached"Dissolved to Total Metal Calculator".
For Outfall 002,please note that monitoring for Zinc is now monthly.
6. For Outfall 002,A compliance schedule has been added for Total Zinc limits in Section A.(2.).
The Total Zinc limits will become effective 48 months from the effective date of the permit.
7. For Outfall 002,Effluent Hardness Sampling was added with quarterly sampling to maintain a
hardness database for this facility. Please note footnote 5 requires that Effluent hardness sampling
be performed in conjunction with sampling for hardness dependent metals(Zinc).
Concurrent with this notification,the Division will solicit public comment on this draft by publishing a
notice in newspapers having circulation in the general Surry County area,as required by the NPDES
Program.Please provide your comments, if any,to me via email [[e-mail]] or write to my
attention care of DEQ/DWR/NPDES Program no later than August 9,2019.Your written comments are
welcome but not mandatory.
Following the mandatory 30-day public comment period,the Division will review all pertinent comments on
your permit draft,and take appropriate action prior to issuing your NPDES permit final. If you have
questions concerning this draft,please e-mail me or call my direct line(919)707-3618.
Sincerely,
Derek Denard,Environmental Specialist
Division of Water Resources,NCDEQ
Enclosure:NPDES Permit NC0088552 (renewal DRAFT)
hc: NPDES Program Files
ec: DWR/WSRO,Gary Hudson[[e-mail]]
Amanda Berger[[e-mail]]
Wastewater Operator Certification Group/Maureen Kinney[[e-mail]]

NPDES Permit NC0088552
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 143-215.1, 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
Aqua North Carolina, Inc.
is hereby authorized to discharge treated wastewater from a facility known as
Colonial Woods Subdivision — Wells #1 & #2 WTP
Atkins Lane, Mt. Airy 27030
Surry County
to receiving waters designated as unnamed tributary to Bull Creek in 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.
The permit shall become effective , 2019.
This permit and the authorization to discharge shall expire at midnight on , 2024.
Signed this day
Linda Culpepper,Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 7

NPDES Permit NC0088552
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked, and as of this 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 described herein.
Aqua North Carolina, Inc.
is hereby authorized to:
1. continue to operate a filter-backwash treatment system in support of potable water production
utilizing green sand treatment technology, including use of the chemicals
• chlorine
• potassium permanganate
• caustic soda
located at the Colonial Woods Subdivision - Wells#1 &#2 WTP, Atkins Lane, Mt Airy, Surry
County; and
2. discharge from said treatment works via Outfalls 001 and 002 at a location specified on the attached
map, into an unnamed tributary to Bull Creek [Stream Segment 12-72-15], a waterbody currently
classified C waters within Subbasin 03-07-03 [HUC: 030401010903] of the Yadkin-Pee Dee River
Basin.
Page 2 of 7

NPDES Permit NC0088552
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
OUTFALL 001 [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Physical Chemical Not Classified Water Pollution Control System [15A NCAC 08G .0302]
During the period beginning on the effective date of this permit and lasting until expiration,the Permittee is
authorized to discharge filter backwash from Well#1 via Outfall 001. Such discharges shall be limited and
monitored 1 by the Permittee as specified below:
LIMITS MONITORING REQUIREMENTS1
PARAMETER
[PARAMETER CODE] Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow(mgd) 50050 Monitor&Report Weekly Estimate Effluent
Total Suspended Solids(mg/1) C0530 30.0 mg/L 45.0 mg/L 2/month Grab Effluent
Total Residual Chlorine 2(µg/L) 50060 17 µg/L 2 2/month Grab Effluent
>6.0 and<9.0
pH(su) 00400 2/month Grab Effluent
standard units
Turbidity(NTU)3 00070 Monitor&Report 2/month Grab Effluent
Total Zinc(µg/L) 01092 Monitor&Report Quarterly Grab Effluent
Total Manganese(µg/L) 01055 Monitor&Report Quarterly Grab Effluent
Total Iron(µg/L) 01045 Monitor&Report Quarterly Grab Effluent
Footnotes:
1. The Permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Condition A. (4.).
2. The Division shall consider compliant all TRC effluent values reported below 50 µg/L.However,the Permittee
shall continue to record and submit all values reported by North Carolina-certified laboratory methods
(including field certified),even if these values fall below 50 µg/L.
3. Discharge from this facility shall not cause receiving-stream turbidity to exceed 50 NTU.If instream
background conditions exceed 50 NTU,this discharge shall not cause instream turbidity to increase.
Conditions:
• Samples shall be taken at the outfall but prior to mixing with receiving waters.
• There shall be no discharge of floating solids or foam in other than trace amounts.
Page 3 of 7
1

NPDES Permit NC0088552
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
OUTFALL 002 [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Physical Chemical Not Classified Water Pollution Control System [15A NCAC 08G .0302]
During the period beginning on the effective date of this permit and lasting until expiration,the Permittee is
authorized to discharge filter backwash from Well#2 via Outfall 002. Such discharges shall be limited and
monitored'by the Pennittee as specified below:
LIMITS MONITORING REQUIREMENTS1
PARAMETER
[PARAMETER CODE] Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow(mgd) 50050 Monitor&Report Weekly Estimate Effluent
Total Suspended Solids(mg/1) C0530 30.0 mg/L 45.0 mg/L 2/month Grab Effluent
Total Residual Chlorine 2(µg/L) 50060 17 µg/L 2 2/month Grab Effluent
>6.0 and<9.0
pH(su) 00400 2/month Grab Effluent
standard units
Turbidity(NTU)3 00070 Monitor&Report 2/month Grab Effluent
Total Zinc(µg/L)4 01092 187.8 µg/L4 187.8 µg/L4 Monthly Grab Effluent
Hardness-Total as
00900 Monitor& QuarterlyGrab
[CaCO3 or(Ca+Mg)](mg/I)5 Report p Effluent
Total Manganese(µg/L) 01055 Monitor&Report Quarterly Grab Effluent
Total Iron(µg/L) 01045 Monitor&Report Quarterly Grab Effluent
Footnotes:
1. The Permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Condition A. (4.).
2. The Division shall consider compliant all TRC effluent values reported below 50 . However,the Permittee
p p µ�
shall continue to record and submit all values reported byNorth Carolina-certified laboratory
p a ry methods
(including field certified),even if these values fall below 50 µg/L.
3. Discharge from this facility shall not cause receiving-stream turbidity to exceed 50 NTU.If instream
background conditions exceed 50 NTU,this discharge shall not cause instream turbidity to increase.
4. Compliance with this limit shall commence on ,approximately 48 months from the permit
effective date. See Compliance Schedule Condition A. (3).
5. Effluent hardness sampling should be performed in conjunction with sampling for hardness dependent metals
(Zinc).
Conditions:
• Samples shall be taken at the outfall but prior to mixing with receiving waters.
• There shall be no discharge of floating solids or foam in other than trace amounts.
Page 4 of 7

NPDES Permit NC0088552
A. (3.) SCHEDULE OF COMPLIANCE (OUTFALL 002)
[G.S. 143-215.1(b)]
1. Within one year from the effective day of the permit the Permittee shall submit to the Division of Water
Resources a Corrective Action Plan summarizing the actions to be taken to achieve compliance with Total
Zinc limits at Outfall 001 and a schedule of activities to implement the Plan.
2. Within two years from the effective date of the permit submit a report to the Division summarizing actions
taken in accordance with the Corrective Action Plan.
3. Within three years from the effective date of the permit submit a report to the Division summarizing actions
taken in accordance with the Corrective Action Plan.
4. Within four years from the effective date of the permit submit a report to the Division summarizing actions
taken in accordance with the Corrective Action Plan.
5. Achieve compliance with Total Zinc limits specified in Section A. (2.)by
Upon approval of the Corrective Action Plan by the Division, the report and actions become an enforceable part
of this permit.Any modifications to the schedule shall be requested to the Division at least ninety(90)days
before the deadline.Modifications to the schedule in excess of four months will be subject to public notice.
A. (4.) ELECTRONIC REPORTING OF 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. (2.) and Section E. (5.) (a)1
The permittee shall report 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 intemet.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:
Page 5of7

NPDES Permit NC0088552
NC DEQ/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
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. 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;
• 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 CFR 127.2(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 state. Instructions 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:
http://www2.epa.gov/compliance/final-national-pollutant-discharge-elimination-system-npdes-electronic-
reporting-rule.
Electronic submissions must start by the dates listed in the"Reporting Requirements"section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division.To obtain an electronic
reporting waiver,a permittee must first submit an electronic reporting waiver request to the Division.
Requests for temporary electronic reporting waivers must be submitted in writing to the Division for written
Page 6 of 7

NPDES Permit NC0088552
approval at least sixty(60)days prior to the date the facility would be required under this permit 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 and 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
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section 13. (11.) (d)I
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II, Section
B. (11.)(a)or by a duly authorized representative of that person as described in Part II, 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:
http://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 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."
S. Records Retention [Supplements Section D.(6.)1
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].
Page 7 of 7

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Colonial Woods Subdivision - Wells 1 and 2 N
NPDES Permit NC0088552
AAtkins Lane, Mt.Airy 27030 , 1 t500
Receiving Stream:UT to Bull Creek
Stream Segment: 12-72-15 Stream Class:C 36.411091°N, -80.624767°W
River Basin:Yadkin-Pee Dee Sub-Basin#:03-07-03 SCALE NC Grid:
County: Surry HUC:030401010903 1:24,000 USGS Quad:Mt.Airy S,NC
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