NC0040070_Draft Permit_20150114

ReeeAr�. . --�A
DIVISION OF WATER OttALI'fY
JAN 13 2015
_ SWP SECTION
NCD NR MOORESVILLE REGIONAL OFFICE
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
January 14, 2015
Mr. C. Edward Cross, Division Manager
City of Gastonia -Two Rivers Utilities
P.O. Box 1748
Gastonia, NC 28053
Subject:
Dear Mr. Cross:
Donald van der Vaart
Secretary
Draft NPDES Permit NCO040070
Two Rivers Utilities Water Treatment
Plant (WTP) —Alum Sludge De -watering
298 West Page Ave., Gastonia 28053
Gaston County
In response to 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 this document to assure your
understanding of the permit limits and monitoring conditions, and to correct errors, if any.
The Division understands that you have made no significant changes to your facility the last permit renewal. We
have made the following updates to your previous permit:
• added updates to facility map and parameter codes.
• added quarterly Total Zinc monitoring.
• added a weekly Turbidity monitoring with a limit of 50 NTUs as a daily maximum due Long Creek being
impaired for turbidity.
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 is beginning implementation.
The requirement to begin reporting discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report (eDMR) internet application has been added to your NPDES permit. [See Special
Condition A. (3.)] For information on eDMR, registering for eDMR and obtaining an eDMR user account, please
visit the following web page:
http://portal.ncdenr.or. web/wq/admin/boWipu/edmr.
For information on EPA's proposed NPDES Electronic Reporting Rule, please visit the following web site:
http://www2.epa.gov/compliance/proposed-npdes-electronic-reporting rule.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Phone: [phone] \ Internet: www rimaterquality.org
An Equal Opportunity \ Affirmative Action Employer — Made in part by recycled paper

Mr. Cross
January 14, 2015
Page 2 of 2
Concurrent with this notification, the Division will solicit public comment on this draft by publishing a notice in
newspapers having circulation in the general Gaston 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 DENR
/ DWR / NPDES Program no later than February 20, 2015. 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 [phone].
Sincerely,
Derek Denard, Environmental Specialist
Division of Water Resources, NCDENR
Enclosure: NPDES Permit NC0040070 (renewal DRAFT)
hc: NPDES Program Files [draft permit and Fact Sheet]
ec: MRO / Michael Parker [[e-mail]] [draft permit, Fact Sheet]
Wastewater Operator Certification Group / Steve Reid [[e-mail]]
ESS/ Aquatic Toxicology Unit/ Susan Meadows [[e-mail]]

NPDES Permit NCO040070
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNAK THE
NATIONAL POLLUTANT DISCHARGE LLIMMATION SYSTEM
In compliance with the provisions of North C
and regulations promulgated and adopted
Commission, and the Federal Water Pollution
City of G
is hereby authorized to
to receivi
in accordancei'aI
forth in Parts I,
The permit shall
(NPDES)
ral Statute 15.1, other lawful standards
�,� orth Carolina ironmental Management
Act, as amended, the
is — Tw
Utilities
a facility known as
ant (WTP)
, Gastonia 28052
my
tributary to Long Creek, within the Catawba River Basin,
ing requirements, and other applicable conditions set
This permit and the authorization to discharge shall expire at midnight on January 31, 2019.
Signed this day
2015.
Thomas A. Reeder, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 7

"41S NPDES Permit NC0040070
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. A&
City of Gastonia — T
is hereby authorized to:
1. continue to operate a conventional,pk*nology water
sedimentation, and filtration] with d66harge_pf wast
sedimentation basins with a design pota;;tme
to
0.75 MGD, with water and wastewater
• coagulation
• disinfectiodill+q ipmeny
• two (2) 0.600 '� _ sedi
• filtration
• Turn ltt�ge de-wa
• 5' hlornWquipm
hemical usar�sisi
aluminum sulft .
dium hypochl?
o R 'um hydroxid
o sotl bicarbonat
o hexarn -phospha
0 orthoph '' "' to
o fluoride
o polymer
o sodium thiosulfate
basin
ilities
t . ant [coagulation, culation,
ewaters from media filter backwash and
of 23.3 NW and a wastewater discharge of
located at the Two Rivers Utilities Water Treatment Plant (WTP) Alum De -watering Facility, 298
West Page Avenue, Gastonia 28052, Gaston County; and
2. discharge from said treatment works via Outfall 001 at a location specified on the attached map,
into an unnamed tributary to Long Creek [Stream Segment 11-129-16-(4)], currently a Class C
waterbody within Subbasin 03-08-36 of the Catawba River Basin.
Page 2 of 7

NPDES Permit NCO040070
A. (I.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[I 5A 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 filter backwash via Outfall 001. Such discharges shall be limited
and monitored' by the Permittee as specified below:
LIMITS
MONITORING REQUIREMENTS I
EFFLUENT
Monthly
Daily
Measurement
Sample
Sample
CHARACTERISTIC
(PARAMETER CODESI
Average
Maximum
Frequency
Type
Location
Flow (MGD)
50050
`r IContinud
Recording2
Effluent
Total Suspended Solids (mg/L)
C0530
30.0 in
45.0 mg/L
Weekly
Grab
Effluent
pH (su)
00400
Not < 6. or9.0
Weekly
ab
Effluent
standard
Total Residual Chlorine 3 (µg/L)
50060
17 µ'' 3
Weekly
Effluent
Turbidity (NTU)
00070
50 NTI� ��.
, Weekly
Grab
Effluent
Total Aluminum 4 (mg/L)
01105
uarterly
Grab
Effluent
Total Iron 4 (µg/L)
01045
�� rly
Grab
Effluent
Total Copper 4 (mg/L)
_ 2
Quad y
Grab
Effluent
Total Manganese 4 (µ
O W
arterly
Grab
Effluent
Total Fluoride 4 (mg/L)
009 i__
Quarterly
Grab
Effluent
Total Zinc 4
0102
Quarterly
Grab
Effluent
Total Ph ikarous L)
65
Quarterly
Grab
Effluent
Total Mfto en (TN) 4 (mg/L
C
Quarterly
Grab
Effluent
Chronic W,'w sting 5
GP3B
Quarterly
Grab
Effluent
TAM IV
Footnotes:
1. No later tN2iys from the tive date of this permit, begin submitting discharge monitoring reports
electronically using NC-;DWR's eDMR application system. See Special Condition A. (3.).
2. The City will have 18)i�+mnths from'the effective date of this permit to install a continuous flow meter. Until
then instantaneous measurements can be taken with the duration of discharge to be noted in log books and a
total daily discharge reported°d�'n the DMR.
3. The Division shall consider TRC effluent values reported below 50 µg/L to be compliant with the
permit. However, the Permittee shall continue to record and submit all values reported by a North
Carolina -certified laboratory method (including field certified), even if these values fall below 50µg/L.
4. Samples shall be collected concurrently with WET -test samples.
5. Whole Effluent Toxicity (WET) testing - testing of Ceriodaphnia dubia shall be performed as 7-day pass/fail
test at 90% effluent concentration, during January, April, July and October [See A. (2.)].
Comments:
Samples shall be taken at the outfall but prior to mixing with the receiving waters.
There shall be no discharge of floating solids or foam in other than trace amounts.
Page 3 of 7

NPDES Permit NCO040070
A. (2.) CHRONIC TOXICITY PASS/FAIL MONITORING (QUARTERLY)
[I 5A NCAC 02B .0500 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 procedureocument 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 January, April, July and October. 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 sh l be performF at the NPDES permitted final
effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition willNedon the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was erformed, using the parameter code
TGP3B. Additionally, DWR Form AT-1 (original) is tQ.,bLsent following ad '`
Attention: At Carolina Divisi ater Resources
Environmental Sciences n
1621 Mail Service Center
Raleigh, N .C. 27699,1621
Completed Aquatic T es s shall b filed with the mental Sciences Section no later
than 30 days after the f the reporting period for which the rep is made.
Test data shall be complete. accurate and include all supporting chemical/physical measurements
performed in association with the toxic ity tests, as well as qlI dose/response data. Total residual chlorine
of the effluent toxicity san=le must:. measured an cued if chlorine is employed for disinfection of
the wa ream.
Should ther a no discharge o oNinfo
acility during a month in which toxicity monitoring is
required, the permittee will completation locatedat the top of the aquatic toxicity (AT) test
form indicating the facility name, pen -nit 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 io a address cited above.
Should the permittee fail to for 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.
Page 4 of 7

NPDES Permit NCO040070
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. (3.) ELECTRONIC REPORTING OF DISCHAR
REPORTS [G.S. 143-215.1(b)]
Proposed federal regulations require electronic submittal of
and specify that, if a state does not establish a system to re
submit DMRs electronically to the Environmental Prot io
that these regulations will be adopted and is beginni7
NOTE: This special condition supplements or sup
permit (Standard Conditions for NPDES Permits):
Beginning no later,
reporting discharge
Monitoring, . ort
eDMR application
(CROMERk),'per
electronically ui#xt
signing, and subri't
following address:
MONITORING
monitoring reports (DMRs)
nittals, then permittees must
'A). The Division anticipates
in Part II of this
late of this-7rmit, the permittee shall begin
ing the NC DWR's Electronic Discharge
g the TV:previ � ?i(s) shall be summarized for each month and
,�
M; The eDNICystem allows permitted facilities to enter
.sonically using the internet. Until such time that the state's
ith 1' ` Cross -Media Electronic Reporting Regulation
require o submit all discharge monitoring data to the state
ill be required to complete the eDMR submission by printing,
original and a copy of the computer printed eDMR to the
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.
Page 5 of 7

2.
'41S NPDES Permit NC0040070
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.
Information on eDMR and application for a temporary waiver he 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
the issuance of the permit or in the case of a
commencement of discharge.
All eDMRs submitted to the permit issr
Section B. (11.)(a) or by a duly authot'
Section B. (I 1.)(b). A person, and not
reporting purposes.
For eDMR submiss
account and login credentials to
Carolina's eDMR sys " regisi
the followin web page:
htt .nc a eb/
Certi �pn. Any perso rr
the follo� ,certification'
WILL BE PTED:
signing
pss the
fore
due on the la of the month following
ility, on the last day e month following the
.-
authority shall be signed by a person described in Part II,
e entative of that person as described in Part II,
;i st be del d signatory authority for eDMR
sul7�.__�mg R must obtain an eDMR user
eDMR system. For `re information on North
D
MR; obtaining an eDMR user account, please visit
itti electronic DMR using the state's eDMR system shall make
FR 1 NO OTHER STATEMENTS OF CERTIFICATION
"I certify, under ,ty of l � _ t this document and all attachments were prepared under my
direction or su ery n p i ccolance with a system designed to assure that qualified personnel
properly gather and e,lupte the information submitted. Based on my inquiry of the person or
persons who manage the "s'tem, 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. "
Page 6 of 7

PV
NPDES Permit NCO040070
3. Records Retention [Supplements 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.) PRODUCTION MODIFICATIONS
Monitoring for this permit is suspended. The permittee shall
days prior to any planned discharges from this facility.
Page 7 of 7
Regional Office within 30

F,ankin
Gt
Big
�_" �n I X
'�• 'Rankin Luke 1Qi ■
1 �
Long Creek i ``4� ' ram; 1 •
[flows east] ,�' ' �sims
Al
UT to Long Creek ,
�`�
[flows north] i it ; _ ens
Outfall 001
(flows north)
West Page Ave.
FApproximate
acility Boundary
A y�
P,Irk
Woodhllt0
321 `' ..
a
City of Gastonia — Two Rivers Utilities WTP
Alum De -watering Facility
298 West Page Avenue, Gastonia 28052
Receiving Stream: UT to Long Creek Stream Segment: 11-129-16-(4)
Drainage Basin: Catawba River Basin Sub -Basin: 03-08-36
Latitude: 35° 16' 06" Longitude: 8V 11' 16"
Stream Class: C HUC: 03050102
State Grid/USGS Quad: F14SW / Gastonia North, NC
Facility
Location
Scale 1: 24,000
p North NPDES Permit NC0040070
Gaston County