NC0068888_Draft Permit_20200421

ROY COOPER
Governor
MICHAEL S. PEGAN
Secretary
S. DANIEL SMITH
Director
Jon A. Page, ORC
Town of Dallas
210 N Holland St.
Dallas, NC 28034
Dear Mr. Page:
NORTH CAROLINA
Environmental Quality
April 21, 2020
Subject: Draft NPDES Permit NCO068888
DaIIaSWWTP
Grade III Biological WPCS
Gaston County
The Division has reviewed your request to renew the subject permit. Please review this draft carefully to ensure a
thorough understanding of the information, conditions, and requirements it contains.
The draft permit includes the following significant changes from the existing permit:
➢ Section A. (4) and Footnote #1 in Section A. (1.) has been updated regarding electronic submission of
effluent data. Federal regulations require electronic submittal of all discharge monitoring reports (DMRs).
➢ Section A. (3) has been updated regarding monitoring requirements for Total Mercury.
Please note that Dallas Branch is listed as an impaired waterbody on the North Carolina 303(d) Impaired Waters
List. Addressing impaired waters is a high priority with the Division, and instream data will continue to be
evaluated. If there is noncompliance with permitted effluent limits and stream impairment can be attributed to
your facility, then mitigative measures may be required.
With this notification, the Division will solicit public comment on this draft permit by publishing a notice in
newspapers having circulation in the general Gaston County area, per EPA requirements. Please provide your
comments, if any, to me no later than 30 days after receiving this draft permit.
Following the 30-day public comment period, the Division will review all pertinent comments and take appropriate
action prior to issuing a final permit. If you have questions concerning the draft, please contact me at 919-707-3712
or via e-mail [[e-mail]].
Sincerely,
Sydney Carpenter
NPDES Compliance and Expedited Permitting
ec: NPDES File [Laserflche]
Mooresville Regional Office [Laserfiche]
D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617
NORTH CAROLINA -
UapaQ,toiE,WI aa.nwlauaiity /� 919.707.9000

NPDES Permit NCO068888
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
PDES
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
Town of Dallas
is hereby authorized to discharge wastewater from a facility located at the
Dallas WWTP
700 E. Ferguson St
Dallas
Gaston County
to receiving waters designated as Dallas Branch in the Catawba 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
This permit and authorization to discharge shall expire at midnight on January 31, 2025.
Signed this day
S. Daniel Smith, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 8

NPDES Permit NC0068888
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.
The Town of Dallas
is hereby authorized to:
1. Continue to operate an existing 0.6 MGD wastewater treatment plant. This facility is located at the
Dallas WWTP, at 700 E. Ferguson St, Dallas in Gaston County. Wastewater treatment includes the
following components:
• Influent pump station
• Bar screen
• Flow splitter box
• Dual 0.3 MGD circular extended -aeration plants with secondary clarifiers and diffused
post -aeration
• Chlorine disinfection with dechlorination
• Dual aerated sludge holding tanks
• Four sludge drying beds
• Influent and effluent flow measuring devices with totalizers
2. Discharge from said treatment works at the location specified on the attached map into Dallas
Branch, currently classified C waters [Stream Index: 11-129-16-7] in sub -basin 03-08-36 [HUC:
0305010206] in the Catawba River Basin.
Page 2 of 8

NPDES Permit NCO068888
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade III Biological 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 from outfall 001. Such discharges shall be limited and
monitored) by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
[eDMR Code]
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location2
Flow [50050]
0.6 MGD
Continuous
Recording
Influent or
Effluent
BOD, 5 day' (20°C) (mg/L)
(Apr. 1 - Oct. 31) [C0310]
13.0 mglL
19.5 mglL
3/Week
Composite
Influent and
Effluent
BOD, 5 day3 (20°C) (mg/L)
(Nov. 1 - Mar. 31) [C0310]
26.0 mg/L
39.0 mg/L
3/Week
Composite
Influent and
Effluent
Total Suspended Solids3 (mg/L) [C0530]
30.0 mg/L
45.0 mg/L
3/Week
Composite
Influent and
Effluent
NH3as N (Apr. 1 - Oct. 31) (mg/L) [C0610]
2.0 mg/L
6.0 mg/L
3/Week
Composite
Effluent
NH3as N (Nov. 1 - Mar 31) (mg/L) [C0610]
4.0 mg/L
12.0 mg/L
3/Week
Composite
Effluent
Dissolved Oxygen (mg/L) [00300]
Daily Average >_ 5.0 mg/L
3/Week
Grab
Effluent
Fecal Coliform (geometric mean) [31616]
200 1100 ml
400 / 100 ml
3/Week
Grab
Effluent
Total Residual Chlorine4 (lug/L) [50060]
18 lug/L
3/Week
Grab
Effluent
Temperature (°C) [00010]
Monitor & Report
Daily
Grab
Effluent
Total Nitrogen (NO2+NO3+TKN)5 (mg/L) [C0600]
Monitor & Report
Quarterly
Composite
Effluent
Total Phosphorus (TP) (mg/L) [C0665]
Monitor & Report
Quarterly
Composite
Effluent
pH [00400]
> 6.0 and < 9.0 standard units
3/Week
Grab
Effluent
Chronic Toxicity6 [TGP3B]
See Footnote 6
Quarterly
Composite
Effluent
Total Mercury? (ng/L) [COMER]
Monitor & Report
11 Permit Cycle?
Grab
Effluent
Dissolved Oxygen [00300]
Monitor & Report
Variable$
Grab
Upstream &
Downstream
Temperature [00010]
Monitor & Report
Variable$
Grab
Upstream &
Downstream
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the Division's eDMR system.
[See A. (4)]
2. Upstream = at least 100 feet upstream from the outfall. Downstream = at NCSR 2275.
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective monthly average influent value (85% removal).
4. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the
permit. However, the Permittee shall continue to record and submit all values reported by a North Carolina
certified laboratory (including field certified), even if these values fall below 50 µg/L.
Page 3 of 8

NPDES Permit NCO068888
5. For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total
Kjeldahl Nitrogen, and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen, respectively. TP is Total
Phosphorus.
6. Chronic Toxicity (Ceriodaphnia dubia) Pass/Fail limit at 90% with testing conducted in February, May,
August & November. [See A. (3)]
7. See A. (2) for details regarding the mercury analysis. EPA Method 1631E must be used for Total Mercury
sampling & analysis.
8. Instream samples shall be collected three times per week from June through September, and once per week
from October through May.
All samples collected should be from a representative discharge event.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER
THAN TRACE AMOUNTS.
A. (2.) EFFLUENT MERCURY ANALYSIS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
The Permittee shall provide one effluent mercury analysis, using EPA Method 1631E, in conjunction
with the next permit renewal application. The analysis should be taken in the first six months of
calendar year 2024. Any additional effluent mercury measurements conducted from the effective date
of this permit and up to the application date shall also be submitted with the renewal application.
If the result of the mercury analysis is not provided with the application, the application may be
returned as incomplete and the Permittee considered non -compliant.
A. (3.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B.0200 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 90%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in
the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," (Revised December 2010, or
subsequent versions) or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised December 2010, or subsequent versions). 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.
If the test procedure performed as the first test of any single quarter results in a failure or ChV
below the permit limit, then multiple -concentration testing shall be performed at a minimum, in
each of the two following months as described in "North Carolina Phase II Chronic Whole
Effluent Toxicity Test Procedure" (Revised -December 2010, or subsequent versions).
Page 4 of 8

NPDES Permit NCO068888
All toxicity testing results required as part of this permit condition will be entered electronically using
the Division's eDMR system for the months in which tests were performed, using the parameter code
TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWR Form AT-3
(original) is to be sent to the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
Or, results can be sent to the email, ATForms.ATB(d),ncdenr.gov.
Completed Aquatic Toxicity Test Forms shall be filed with the Water 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, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. 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 Water Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month. Assessment of toxicity compliance is based on the toxicity
testing quarter, which is the three-month time interval that begins on the first day of the month in which
toxicity testing is required by this permit and continues until the final day of the third month.
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.
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.
A. (4.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[NCGS 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.
Page 5 of 8

NPDES Permit NC0068888
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits):
• Section B. (11.)
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Signatory Requirements
Reporting
Records Retention
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 internet. The eDMR system may be
accessed at: https:Hdeq.ne.gov/about/divisions/water-resources/edmr.
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 following address:
NC DEQ / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
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
Page 6 of 8

NPDES Permit NC0068888
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:
https://www.federalre ig•ster.gov/documents/2015/10/22/2015-24954/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 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:
hqp:Hdeq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.)
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 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:
Page 7 of 8

NPDES Permit NC0068888
hltp:Hdeq.ne.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. "
5. 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 8 of 8

Town of Dallas WWTP
NPDES Permit NCO068888
Latitude: 35'18'21" N Longitude: 81°09'55" W
USGS Quad: Gastonia North Stream Class: C
Sub -basin: 03-08-36 Receiving Stream: Dallas Branch
Facility
Location AOW
Gaston County