NC0074268_Permit issuance_20170315

Water Resources
ENVIRONMENTAL QUALITY
March 15, 2017
Ms. Stephanie Scheringer, Division Manager, Wastewater Treatment
Two Rivers Utilities
P.O. Box 1748
Gastonia, North Carolina 28053
Dear Ms. Scheringer:
ROY COOPER
Gocemor
MICHAEL S. REGAN
Secrrmn
S. JAY ZIMMERMAN
Direnor
Subject: Final NPDES Permit Renewal
Permit NCO074268
Crowders Creek WWTP
Gaston County
Class IV Facility
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES permit. This permit is issued 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 dated October 15, 2007
(or as subsequently amended).
In response to your comments on the draft permit the permit was modified as follows:
• The address for the facility was updated.
• Monitoring frequency for TSS, ammonia, and fecal coliform was reduced to 2/week
according to the Guidance Regarding the Reduction in Monitoring Frequency.
• The Total Nitrogen effluent limit and monitoring requirement of 6 mg/l listed in the draft
permit was deleted. At the time when the permit was drafted the Division included
effective days and expiration dates for the existing and proposed limits expecting that the
permit would have been issued during 2016. The TN limit of 6 mg/l would have been
applicable until April 1, 2017 but only during the summer season. Due to delays in
issuing the permit this limit is no longer applicable since the effective day of the permit is
April 1, 2017.
• Section A.(4.)(c.) was deleted, it was inadvertently included for this permit but as you
noted is not applicable.
• The location of the facility was corrected in the map.
• Standard conditions are the same as the previous permit.
This final permit contains the following changes from your previous permit:
State ol'North Carolina I Environmental Quality I Water Resou
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919 907 6300

• Mass limits for total nitrogen and total phosphorus were added to the permit. The
calculated allowable TN and TP loads include the allocation from Bessemer City in
addition to the Crowders Creek allocation. The summer TN limits were calculated based
on the 6 mg/l concentration limit established by the Lake Wylie TMDL. The winter TN
limits were calculated based on 12 mg/l. The annual TT limit was calculated based on 1
mg/l limit in the TMDL.
• As a result of a reasonable potential analysis monitoring for bis(2-ethylhexyl)phthalate,
copper, nickel, zinc and silver were removed from the permit and monitoring for cyanide
was added.
• Sampling frequency for the effluent pollutant scan was modified to three times during the
permit cycle. See Special Condition A. (7). This .condition was also modified to add
narrative for four seasonal 2" species toxicity tests.
• Effluent hardness and instream hardness sampling, upstream of the discharge, has been
added to this permit at a monitoring frequency of quarterly. See Sections A.(1.) Effluent
Limitations and Monitoring Requirements and A. (2) Instream Sampling.
• A mercury evaluation was conducted in accordance with the Permitting Guidance
developed for the implementation of the statewide Mercury TMDL to determine the need
for a limit and/or a Mercury Minimization Plan (MMP). the limit was eliminated from
your permit but you will be required to develop a MMP. See Special Condition A. (9).
• 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. 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 final NPDES
permit. See Special Condition A (8).
For information on eDMR, registering for eDMR and obtaining an eDMR user account,
please visit the following web page: http://deq.nc.gov/about/divisions/water-
resources/edmr.
For more information on EPA's final NPDES Electronic Reporting Rule, please visit the
following web site:
http://www2.epa.gov/compliance/final-national-pollutant-discharge-elimination-system-
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 require modification or revocation and reissuance of the permit. This permit does not affect
the legal requirements to obtain other permits which may be required by the Division of Water
Resources or any other Federal, State, or Local governmental permits that may be required.
K

If you have any questions concerning this permit, please contact Teresa Rodriguez at telephone
number [phone] or at email [e-mail].
Sincerely,
ay Z C4 "r".
3 ector, Division of Water Resources, NCDEQ
Hardcopy: NPDES Files
Central Files
DWIWooresville Regional Office / Water Quality
Ecopy: US EPA Region 4
DWR/Aquatic Toxicology Branch/Susan Meadows

Permit NCO074268
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
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,
City of Gastonia
is hereby authorized to discharge wastewater from a facility located at the
Crowders Creek Wastewater Treatment Plant
5642 South York Road
Gastonia
Gaston County
to receiving waters designated as Crowders Creek 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.......................................................................................................... April 1, 2017.
This permit and authorization to discharge shall expire at midnight on .................................... August 31, 2020.
Signed this day ..........................March 15, 2017.
S. J, ' Zimmerman, fVefdr
D. sion of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 12

I
Permit NCO074268
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 City of Gastonia
is hereby authorized to:
1. Continue to operate an existing 6.0 MGD wastewater treatment facility located at 5642 South York Road,
Gastonia, Gaston County, and consisting of:
• Mechanical bar screen
• Grit removal
• Influent pump station
• Dual primary clarifiers
• Dual basins for biological nutrient removal
• Dual final clarifiers
• Two polishing/ stabilization ponds
• Chlorine contact chamber (gas)
• S02 dechlorination
• Static post aerator
• Dissolved air floatation (DAF) unit
• Four anaerobic digesters
• Gravity sludge thickener
• Filter belt press
• Alum and caustic addition
2. Discharge wastewater from said treatment works at the location specified on the attached map into
Crowders Creek, classified Class C waters in the Catawba River Basin.
Page 2 of 12

Permit NCO074268
5. TN or TP Load is the mass quantity of Total Nitrogen or Total Phosphorus discharged in a given period of
time. See Special Condition A.(4.), Calculation of TN or TP Loads.
6. Summer is defined as April 1- October 31; winter is defined as November 1- March 31. Annual means on a
calendar year basis, January 1- December 31.
7. Chronic Toxicity (Ceriodaphnia), P/F at 41 % with testing in March, June, September and December. See
Special Condition A.(6.).
8. See Special Condition A.(7.) Priority Pollutant Scan
(b.) There shall be no discharge of floating solids or visible foam in other than trace amounts.
A.(2.) INSTREAM SAMPLING [15A NCAC 02B .0500 et seq.]
Instrearn monitoring is required for the following parameters at the locations specified:
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Dissolved Oxygen
Grab
U, D1, D2
Temperature
Footnote 2
Grab
U, D10, D2
Conductivity
Footnote 2
Grab
U, D1
Hardness
Quarterly
Grab
U
Footnotes:
1. U: upstream at Highway 1108 (Crawford Rd.); D1: downstream at NCSR 2424 (Thompson Road); DI
downstream at SCSR 564 (Meek Rd).
2. Instream samples shall be grab samples taken 3/week Qune-September) and 1/week (October -May).
A.(3.) TOTAL NITROGEN AND TOTAL PHOSPHORUS LIMITS [G.S.143-215.1(b)]
(a.) Total Nitrogen (TN) allocations and load limits for NPDES dischargers in the Lake Wylie watershed
are seasonal (summer and winter) values. Summer is defined as April 1 through OctDber 31, and
winter is defined as November 1 through March 31. Total Phosphorus (TP) allocations and load limits
are annual values and apply on a calendar year basis, January 1 through December 31.
(b.) The TN (or TP) Load limit in this Permit may be modified as the result of allowable changes in the
Permittee's allocation.
(L) Allowable changes include those transfers resulting from the purchase, sale, trade, or lease of
allocation between the Permittee and other dischargers assigned allocation under the 1995 Lake
Wylie TMDL; regionalization (if both facilities were assigned allocation); and other transactions
approved by the Division.
(ii.) The Permittee may request a modification of the TN (or TP) Load limit in this Permit to reflect
allowable changes in its allocation.
(A), The request must include an analysis demonstrating that change in allocations and limits
does not have a reasonable potential to cause localized water quality impacts.
(B) Upon receipt of timely and proper application, the Division will propose to modify the
permit as appropriate and in accordance with state and federal program requirements.
(C) Changes in TN or TP limits become effective on the first January 1(annual limit), the first
April 1(summer limit), or the first November 1(winter limit) following permit
modification. The Division must receive application no later than 180 days prior to the
requested effective date for any limit change.
(iii.) Any requests for modification should be sent to:
Page 4 of 12

Permit NC0074268
PART I - MONITORING, CONTROLS, AND LIMITATIONS FOR PERMITTED DISCHARGES
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B
.0400 et seq., 02B .0500 et seq.]
(a.) During the period beginning on the effective date of the 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:
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Flow
6.0 MGD
Continuous
Recording
Influent or Effluent
Total Monthly Flow
Monitor and Report
Monthly
Recorded or
Calculated
Influent or Effluent
BOD, 5-day, 20°C 2
13.0 mg/L
19.5 mg/L
2/Week
Composite
Influent & Effluent
Total Suspended Solids 2
30.0 mg/L
45.0 mg/L
2/Week
Composite
Influent & Effluent
NH3 as N
(April 1- October 31)
2.0 mg/L
6.0 mg/L
2/Week
Composite
Effluent
NH3 as N
(November 1— March 31)
10.0 mg/L
30.0 mg/L
2/Week
Composite
Effluent
Dissolved Oxygen
Daily average >_ 6.0 mg/L
Daily
Grab
Effluent
Fecal Coliform
(geometric mean)
200/100 mL
400/100 mL
2/Week
Grab
Effluent
Temperature
Dally
Grab
Effluent
Hardness [CaCO3 or (Ca +
Mg)] mg/L
Quarterly
Composite
Effluent
Total Cyanide (Ng/1)
Quarterly
Composite
Effluent
pH
2: 6.0 and <— 9.0 standard units
Dally
Grab
Effluent
Total Residual Chlorine 3
1 128
Ng/L
Daily
Grab
Effluent
TM (mg/L) 6
Monitor and Report
Weekly
Composite
Effluent
NO3-N + NO2-N (mg/L) 6
Monitor and Report
Weekly
Composite
Effluent
TN 4
Monitor and Report
Weekly
Composite
Effluent
Monitor & Report (lb/mo)
Monthly
Calculated
TN Load 5-6
64,251 lb/summer (eff. 4/1/17)
Seasonally
Calculated
Effluent
90,672 lb/winter (eff. 11/1/17)
Seasonally
Calculated
TP (mg/L) 4
1 mg/L (monthly average)
(effective through 12/31/17)
W�
Composite
Effluent
TP Load 5-6
Monitor & Report (lb/mo)
Monthly
Calculated
Effluent
18,265 Ib/yr (eff. 1/1/18)
Annually
Calculated
Chronic Toxicity'
Quarterly
4Footnote
Composite
Effluent
Effluent Pollutant Scan S
Monitor and Report
Footnote 8
8
Effluent
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application
system. See Special Condition A. (8.).
2. The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. Facility shall report all effluent TRC values reported by a NC certified laboratory including field certified.
However, effluent values below 50 µg /L will be treated as zero for compliance purposes.
4. For a given wastewater sample, TN = TKN + NO3-N + NOrN, where TN is Total Nitrogen, TKN is Total
Kjeldahl Nitrogen, and NOrN and NOrN are Nitrate and Nitrite Nitrogen, respectively. TP is Total
Phosphorus. See Condition A.(3.) Total Nitrogen and Total Phosphorus Limits.
Page 3 of 12

Permit NCO074268
NCDEQ/ DWR/ NPDES Programs
1617 Mail Service Center
Raleigh, NC 27699-1617
A.(4.) CALCULATION AND REPORTING OF TOTAL NITROGEN AND TOTAL
PHOSPHORUS LOADS [G.S.143-215.1(b)]
(a.) The Permittee shall calculate monthly, seasonal, and annual TN (or TP) Loads as follows:
(i.) Monthly TN (or TP) Load (lb/mo) = TN (or TP) x TMF x 8.34
where:
TN or TP the average Total Nitrogen or Total Phosphorus concentration
(mg/L) of the composite samples collected during the month
TMF the Total Monthly Flow of wastewater discharged during the
month (MG/mo); that is, the sum of daily flows in the month
8.34 conversion factor, from (mg/L x MG) to pounds
(ii.) Summer TN Load (lb/summer) = Sum of the April - October Monthly TN Loads for the season
(iii.) Winter TN Load (lb/winter) = Sum of the November - March Monthly TN Loads for the season
(iv.) Annual TP Load (lb/yr) = Sum of the 12 Monthly TP Loads for the calendar year
(b.) The Permittee shall report monthly Total Nitrogen and Total Phosphorus results (mg/L and lb/mo) in
the appropriate discharge monitoring report for each month: the summer TN results with the October
DMR; the winter TN results with the March DMR; and each calendar year's results with the December
report for that year.
(c.) Any addition, deletion, or modification of the listed allocation(s) (other than to correct typographical
errors) or any change in status of any of the listed allocations shall be considered a major modification
of this permit and shall be subject to the public review process afforded such modifications under
state and federal rules.
A.(5.) NUTRIENT ALLOCATIONS [G.S.143-215.1(B)]
(a.) The following table list the Total Nitrogen (TN) and Total Phosphorus (TP) allocations assigned to,
acquired by, or transferred to the Permittee in accordance with the 1995 Lake Wylie TMDL and
nutrient management strategy and the status of each as of permit issuance. For compliance purposes,
this table does not supersede any TN or TP limit established elsewhere in this permit.
Total Nitrogen Allocation
0"
` Y
a
K t f
.�wc-
DATE
4
Y
.t r p
Ail' ciN
T
`
SOi1RCE
A1:L1►0�!'
STS=
Base
TMDL
1995
64,251lb/season
90,672Ib/yr
Active
Connection of
Supplemental
Bessemer City,
2015
16,063 lb/season
22,668 lb/yr
Reserve
NCO020826
Total Allocation
80,314 lb/season
113,341 lb/yr
Mixed
Footnotes:
1. Summer is defined as Apri11- October 31. Winter is defined as November 1- March 31.
Page 5 of 12

Permit NCO074268
Total Phosphorus Allocation
ALLOCATION
DISCHARGE
TYPE
SOURCE
DATE
ALLOCATION
STATUS
ANNUAL'
Base
TMDL
1995
18,265lb/yr
Active
Connection of
Supplemental
Bessemer City,
2015
4,566 Ib/yr
Reserve
NCO020826
Total Allocation
22,831 Ib/yr
Active
Footnotes:
1. Annual means on a calendar year basis, January 1- December 31.
(b.) Any addition, deletion, or modification of the listed allocation(s) (other than to correct typographical
errors) or any change in status of any of the listed allocations shall be considered a major modification
of this permit and shall be subject to the public review process afforded such modifications under
state and federal rules.
A.(6.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) [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 41%.
The permit holder shall perform at a minimum, aya 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 March, June, September,
and December. 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.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) 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:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1623 Mail Service Center
Raleigh, NC 27699-1623
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
Page 6 of 12

Permit NC0074268
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.
Page 7 of 12

Permit NCO074268
A.(7.) EFFLUENT POLLUTANT SCAN [G.S.143-215.1(b)]
(a.) The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below.
One scan must be performed in each of the following years: 2017, 2018, and 2019. Analytical methods
shall be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to determine whether
parameters are present in concentrations greater than applicable standards and criteria. Samples
should be collected with one quarterly toxicity test each year, and must represent seasonal variation
[i.e., do not sample in the same quarter every year]. Unless otherwise indicated, metals shall be
analyzed as "total recoverable."
Ammonia (as N)
Trans-1,2-dichloroethylene
Bis (2-chloroethyl) ether
Chlorine (total residual, TRC)
1,1-dichloroethylene
Bis (2-chloroisopropyl) ether
Dissolved oxygen
1,2-dichloropropane
Bis (2-ethylhexyl) phthalate
Nitrate/Nitrite
1,3-dichloropropylene
4-bromophenyl phenyl ether
K3eldahl nitrogen
Ethylbenzene
Butyl benzyl phthalate
Oil and grease
Methyl bromide
2-chloronaphthalene
Phosphorus
Methyl chloride
4-chlorophenyl phenyl ether
Total dissolved solids
Methylene chloride
Chrysene
Hardness
1,42,2-tetrachloroethane
DI-n-butyl phthalate
Antimony
Tetrachloroethylene
Di-n-octyl phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracene
Beryllium
1,1,1-trichloroethane
1,2-dichiorobenzene
Cadmium
1,42-trichloroethane
1,3-dichlorobenzene
Chromium
Trichloroethylene
1,4-dichlorobenzene
Copper
Vinyl chloride
3,3-dichlorobenzidine
Lead
Acid -extractable avmnounds:
Dlethyl phthalate
Mercury (EPA Method 1631E)
P-chloro-m-cresol
Dimethyl phthalate
Nickel
2-chlorophenol
2,4-dinitrotoluene
Selenium
2,4-dichlorophenol
2,6-dlnitrotoluene
Silver
2,4-dimethylphenol
1,2-diphenylhydrazine
Thallium
4,6-dinitro-o-cresol
Fluoranthene
Zinc
2,4-dlnitrophenol
Fluorene
Cyanide
2-nitrophenol
Hexachlorobenzene
Total phenolic compounds
4-nitrophenol
Hexachlorobutadiene
Jiolatile a —manic
Pentachlorophenol
Hexachlorocyclo-pentadiene
Acrolein
Phenol
Hexachloroethane
Acrylonitrile
2,4,6-trichlorophenol
Indeno(1,2,3-cd)pyrene
Benzene
Besse neutral a2Mg2unds.•
Isophorone
Bromoform
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-nitrosodi-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrosodimethylamine
Chloroethane
Benzo(a)anthracene
N-nitrosodiphenylamine
2-chloroethyl vinyl ether
Benzo(a)pyrene
Phenanthrene
Chloroform
3,4 benzofluoranthene
Pyrene
Dichlorobromomethane
Benzo(ghi)perylene
1,2,4-trichlorobenzene
1,1-dichloroethane
Benzo(k)fluoranthene
1,2-dichloroethane
Bis (2-chloroethoxy) methane
(b.) Reporting. Test results shall be reported on DWR Form -A MR-PPA1(or in a form approved by the
Director) by December 31st of each designated sampling year.
The report shall be submitted to the
following address: NCDEQ/ DWR/ Central Files,1617 Mail
Service Center, Raleigh, North
Carolina 27699-1617.
(c.) Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that
Municipal facilities that are subject to the Effluent Pollutant Scan requirements listed above are also
subject to additional toxicity testing requirements specified in
Federal Regulation 40 CFR 122.210)(5).
The US EPA requires four (4) toxicity tests for a test organism
other than the test species currently
required in this permit. The multiple species tests should be conducted either quarterly for a 12-
month period prior to submittal of the permit renewal application, or four tests performed at least
annually in the four and one half year period prior to the application. These tests shall be performed
Page 8 of 12

Permit NCO074268
for acute or chronic toxicity, whichever is specified in this permit. The multiple species toxicity test
results shall be filed with the Aquatic Toxicology Branch at the following address:
North Carolina Division of Water Resources
Water Sciences Section/ Aquatic Toxicology Branch
1623 Mail Service Center
Raleigh, North Carolina 27699-1623
(d.) Contact the Division's Aquatic Toxicology Branch at 919-743-8401 for guidance on conducting the
additional toxicity tests and reporting requirements. Results should also be summarized in Part E
(Toxicity Testing Data) of EPA Municipal Application Form 2A, when submitting the permit renewal
application to the NPDES Permitting Unit.
A.(8.) 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 and specify that, if a state does not establish a system to receive such submittals, then permittees
must submit monitoring data and reports electronically to the Environmental Protection Agency (EPA). 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 internet. Until such time that the staWs 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 DEQ / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
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.
Page 9 of 12

Permit NC0074268
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 122.410)(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 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 B. (11.) (d)1
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 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:
http://deq.nc.gov/about/divisioris/water-resources/edmr
Certification. Any person submitting an electronic DMR using the staWs eDMR system shall make the
following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
Page 10 of 12

Permit NCO074268
"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.
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.(9.) MERCURY MINIMIZATION PLAN [G.S.143-215.1(b)]
The permittee shall develop and implement a mercury minmuzation plan during this permit term. The
MMP shall be developed within 180 days of the NPDES Permit Effective Date, and shall be available for
inspection on -site. A sample MMP was developed through a stakeholder review process and has been
placed on the Division website for guidance (hft://Rortal.ncdenr.org/webZwAZLwRZps/­nRdes under
Model Mercury Minimization Plan). The MMP should place emphasis on identification of mercury
contributors and goals for reduction. Results shall be summarized and submitted with the next permit
renewal. Performance of the Mercury Minimization Plan will meet the requirements of the TMDL (Total
Maximum Daily Load) for mercury approved by USEPA on October 12, 2012, unless and until a Waste
Load Allocation specific to this facility is developed and this NPDES permit is amended to require
further actions to address the Waste Load Allocation.
Page 11 of 12

Permit NC0074268
• . t ,ram 'r. � '�)
-°• t .. \� \ �I ` Illy sic-- / �� j�� �/ j� � � /
OutfaH 001 ( ` cz-) .� 'l
r
,f� C-i I / �. r, j., � h {\) Vd � jj++• , � �G jl t � �/ C' � /` 11 ��"•
"-
i O � h. ,•
Crowder5 Creek WWTP — NCO074268 Facility Location (not to scale)
Receiving Stream: Crowders Creek Stream Class:C
Drainage Basin: Catawba River Basin Sub -Basin: 03-08-37
HUC: 03040105
State Grid: F16SE USGS Quad: Concord SE, N.C. Latitude 35. 10' 10" Longitude 81' 11' 48"
Page 12 of 12

TWO
We are TR U
Ms. Teresa Rodriguez
NPDES Complex Permitting Unit
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Draft NPDES Permit Renewal
Permit N00074268
Crowders Creek WWTP
Gaston County
Class IV Facility
Dear Ms. Rodriguez:
February 15, 2017
RECEIVEDINCOEWWR
FE,q 21 2017
��tgefiiPettinScton
Thank you for sending the draft of Crowders Creek W WTP's renewed NPDES permit which we received
February 2, 2017. We have reviewed this draft, and appreciate the thorough preparation and the
changes that were made in limits and monitoring frequencies following the data review. In
accordance with your request, we would like to submit the following comments for potential
modifications for the final permit:
The address for the Crowders Creek WWTP should be listed as 5642 South York Road, Gastonia on
pages 1 and 2.
• A monthly TN Limit of 6 mg/L is listed through March 3V 2017. We ask that this be removed since
we do not believe there should be a winter concentration limit in effect during this period.
• "DWQ Guidance Regarding the Reduction of Monitoring Frequencies in NPDES Permits for
Exceptionally Performing Facilities" states that facilities meeting the requirements may have
onitoring reduced to 2/week. The Crowders Creek WWTP met the requirements for BOD, TSS,
ammonia and fecal coliform, but monitoring was only reduced to 3/week. We respectfully ask that
the minimum requirement for this monitoring be reduced to 2/week.
�• ection A.(4.)(c.) makes an incorrect reference to Special Condition A.(2) and talks of combining
trient limits with Long Creek WWTP, which is not applicable for Crowders WWTP. We believe this
section should be deleted.
• T map shows the discharge for Crowders Creek WWTP at an incorrect location. Please see the
attached map with the location of the discharge marked.

• Standard Conditions were not included with the draft permit. We do not have any comments on
Standard Conditions if version 11/09/2011.1 is included.
We appreciate DWR's work on this permit and have no other comments on the draft at this time. If I
can be of any assistance please feel free to contact me at 704-866-6726 or email at
[e-mail].
Sincerely,
Stephanie Scheringer
Division Manager Wastewater Treatment
Two Rivers Utilities
Attachment: Facility Location Map
CC: Kevin Graves, ORC Crowders WWTP
CERTIFIED MAIL: 7014 0150 0002 0276 0852

Permit NCO074268
Faculty Location (not to scale)
Crowders Creek W WTP — NCO074268 �y
Receiving Stream: Crowders Creek Stream Class: C
1Y
Drainage Basin: Catawba River Basin Sub -Basin: 03-08-37
HUC: 03040105
State Grid: F16SE USGS quad: Concord SE, N.C. Latitude 35' 1W 10" Longitude 81. 11' 48"
Page 12 of 12

PUBLI1.NUTICE
Nddh Carolina
Environmental
Management
ComWsz4W
NPDES Unit
1617 Mail Service AFFIDAVIT OF INSERTION OF ADVERTISMENT
Center
Raleigh, NC The Gaston Gazette
27699-1617
Notice of Intent
to Issue a
NPDES Gastonia, N.C.
Wastewater Gaston County
Permit
The North Carolina Envi-
ronmental Management
Commission proposea to
issue a NPDES waste-
The Gaston Gazette does certify that the advertisement for:
water discharge permit to
the persons) listed below.
ard-
ng�the cpoposed ants rpermiit
WASTEWATER PERMIT: NC0006033, Eagle Road WWTP; NC0020184, Long Creek
will be accepted until 30
WWTP; NC0074268, Crowders
days after the publish date
of this notice. The Director
of the NC Division of Water
Resources (DWR) may
hold shouldathere blbe ic a signifi
Measuring 9.84 inches appeared in The Gaston Gazette, a newspaper published in
caritPleee ofpailcublicrom acts
Gaston County, Gastonia, N.C., in issue(s):
and/or information re-
quests to DWR at the
above address. Interested
visit the
at 512 rsonN. Salisbury Sttrreett,,
01 /29/2017.
Raleigh, NC to review in-
formation on file. Addi-
tional information on
NPDES permits and this
notice may be found on our
website: hho://dea.nc
0% a by rating (919)
807-6397.
The City of Gastonia has
-appled for renewal of par-
mk NC0008033 ror Eagle
Road WWTP in Gaston
County; this facility dis-
charge is westee�waterto SouthFork
Name of Account: NCDENR/DWQ/NPDES
Catawba River, Catawba
Order Number: 54581776
River Basin.
Ad Number: 54701813
The City of Gastonia (P.O.
Box 1748, Gastonia, NC
28053) requested renewal
of perk NC0020184 for
Gastton County, tth�facAfty
Sworn to, and subscribed before me this 30 th day of January, 2017.
discharge is treated munio-
KI al wastewater to S. Fork
Catawba River, Catawba
River Basin.
The City of Gastonia re-
quested renewal of ppeerk
NCO074268 for the Crowd -
am Creek WWTP in Gas-
ton County. This permitted
treated gmuncipal waste, ,,,,,,l0E❑S
water to Crowders Creek in 2�• the Catawba River Basin.
f Stephanie B. Sisk, Notary Public
IC -January 29, 2017. NO -NARY
Text GS81776 to 56654 =
PUBLIC U= My Commission Expires March 23, 2020

DEPARTEMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NCO074268
Facifity Information
Applicant/Facility Name:
City of Gastonia / Crowders Creek WWTP
Applicant Address:
P.O. Box 1748, Gastonia, NC 28053-1748
Facility Address:
5642 York Highway, Gastonia
Permitted Flow:
6 MGD
Type of Waste:
Domestic/Industrial
Classification:
IV
Permit Status:
Renewal
County:
Gaston
Miscellaneous
Receivin Stream:
Crowders Creek
Sub -basin:
03-08-37
Stream Classification:
C
HUC:
0304010501
303(d) Listed?
Yes
State Grid / USGS Quad:
Gastonia S/C14NW
Drains a Area mil):
70.4
Latitude:
35010' 10"
Summer 7Q10 (cfs)
13.3
Longitude:
810 11' 48"
Winter 7Q10 (cfs)
20
Regional Office:
Mooresville
Average Flow cfs):
82
Permit Writer.
Teresa Rodriguez
IWC (%):
42
Date:
1/19/2017
I. SUMMARY
The Crowders Creek WWTP is owned by the City of Gastonia and operated and maintained by Two Rivers
Utilities. Gastonia submitted an application for renewal on March 2, 2015. The permit expired on August
31, 2015. The Crowders Creek WWTP is permitted at 6 MGD and consists of. screening/grit removal,
primary clarifiers, dual anoxic/oxic basins, final clarifiers, polishing ponds, chlorine contact basin,
dechlorination and static aerator. Current flows average 2.57 MGD.
Gastonia has a full pretreatment program through the Division's PERCS Unit. The Crowders Creek
WWTP receives wastewaters from four categorical industrial users, one non -categorical industrial user
and three satellite municipalities (Bessemer City, Kings Mountain and Clover). The pretreatment program
will continue to be implemented in accordance with the permit.
Gastonia connected the Bessemer City WWTP (NC0020826) to the Crowders Creek WWTP. Upon
connection the Bessemer City WWTP was decommissioned. Gastonia requested to add the total nitrogen
(TN) and total phosphorus (TP) allocation from Bessemer City to the Crowders Creek permit and that the
limits for TN and TP be expressed as mass limits. This facility is subject to the Nutrients Management
Strategy from the 1995 Lake Wylie TMDL.
Gastonia requested the following permit modifications:
1. Reduction in monitoring frequency for BOD, TSS, ammonia and fecal coliform.
2. Reduce instream monitoring to monthly year around.
3. Remove limit and monitoring for nickel.
II. RECEIVING STREAM
This facility discharges to Crowders Creek in the Catawba River Basin (approximately 10 miles upstream
form Lake Wylie in South Carolina), classified C waters, HUC 0304010501. Crowders Creek,
Assessment Unit 11-135e, is impaired for benthic organisms in the draft 2016 303(d) list.
Fact Sheet
NPDES N00074268
Page 1

III. LAKE WYLIE TMDL
Background
Due to eutrophic conditions and chlorophyll a water quality violations a TMDL and Nutrient
Management Strategy was developed in 1995 for the North Carolina portion of Lake Wylie and its
tributaries. The Nutrient Management Strategy was approved by the EPA in 1996. The strategy set
individual allocations for existing WWTPs and new/expanding discharges. The Division incorporated
permit limits of 6 mg/1(summer only) for Total Nitrogen (TN) and 1 mg/1 for Total Phosphorus (TP) in
the Gastonia's Crowders Creek WWTP and Bessemer City WWTP permits that were effective January 1,
2000. TN and TP limits are expressed as average concentrations. TN are summer limits (April -October);
those for TP apply year-round.
With this permit renewal Gastonia is requesting to add the allocation from Bessemer City WWTP to the
Crowders Creek permit. In addition, Gastonia requested to have the TN and TP limits expressed as mass
limits. Gastonia and Charlotte -Mecklenburg Utilities manage wastewater infrastructure in the area
surrounding Lake Wylie. To effectively manage the wastewater needs in this area both entities have
combined or purchased treatment systems creating regional treatment facilities. In order to transfer
nutrient allocations, nutrient limits for the facilities must be expressed as mass loads rather than
concentrations. Therefore, the Division must adopt a standard way of expressing TN and TP limits that
both enables nutrient transfers and ensures that any transfers remain consistent with the approved TMDL.
Annual mass limits will enable the transfer of allocations among dischargers and are consistent with the
phosphorus allocations set in the TMDL. However, annual limits for nitrogen do not, by themselves,
ensure that summer -season loads satisfy the TMDL: a facility could exceed its allowable summer load
and still meet the annual limit by improving plant performance for the rest of the year. An additional limit
(or other control) is necessary to protect water quality during the summer season.
Proposed TMDL Implementation
The Division proposes to implement the Lake Wylie TMDL using the following approach:
• The distribution of nutrient allocations — and any transfer of allocations — must be consistent with
the approved Lake Wylie TMDL.
a. The point source allocations assigned in the TMDL to the lake and its tributaries are valid
only in the original study area and cannot be transferred outside that area except through
modification of the TMDL and the approval of EPA Region 4.
b. Similarly, the tributary allocations identified in the TMDL are only valid within the
assigned subwatersheds and cannot be transferred elsewhere without EPA approval.
• Within each subwatershed, transfers and other changes in allocations cannot result in exceedance
of the tributary allocations in the TMDL. If additional industrial facilities request allocations
based on BAT determinations (none are foreseen at this time), the Division will consider the
request with Region 4.
• Only those allocations that were identified in the TMDL (WWTPs) or authorized (industries with
BAT determinations) are valid. Facilities within the Lake Wylie study area cannot receive credit
for connecting other WWTPs located outside the study area.
• No transfer of allocation will be approved or implemented until the Division is satisfied that the
transfer will not result in localized impacts ("hot spots").
• TN limits will be implemented as follows:
a. Set summer mass TN limits for all affected dischargers based on the summer daily loads
in the TMDL;
Fact Sheet
NPDES NC0074268
Page 2

b. Set winter limit based on 12 mg/l or other approved BAT determinations.
c. Add summer -only mass TN limits for affected industries based on the same daily loads as
their annual limits.
• TP limits will be implemented as annual mass limit based on daily loads specified on the TMDL
or approved BAT determination.
Proposed Limits
The proposed limits for the Crowders Creek permit will follow the above strategy. Since both the
Crowders Creek W WTP and the Bessemer City W WTP had allocations in the TMDL and discharge
within the same subwatershed the allocation from Bessemer City can be transferred to Crowders Creek.
Since the allocations were added it is necessary to maintain the concentration limits in the current permit
to meet the TMDL.
Table 1. TN Proposed Allocations and Limits
:.. Total Nitrogen
Facility
Summer
Summer
Summer
Status
St
Winter
Winter
Annual
Status
GD
m
lb/d
lb/season
m
lb/d
lb/
Crowders
6.0
6.0
300
64,251
Active
12.0
600
90,672
Active
Creek
Bess
1.5
6.0
75
16,063
Active
12.0
125
22,668
Active
Ciemer
Total Allocation
80 14
113 340
Limits
80 14
113,340
Table 2. TP Proposed Limits
Total Phosphorus
Facility
Q
MGD
Annual
mg/1
Annual
lb/d
Annual
lb/yr
Status
Crowders Creek
6.0
1.0
50
18,265
Active
Bessemer City
1.5
1.0
13
4,566
Active
Total Allocation
22,830
Limit
22 830
Crowders Creek/Lake Wylie Data
There are several ambient monitoring stations in Lake Wylie and tributaries maintained by both the Division
and the South Carolina Department of Health and Environmental Control (DHEC). Data available in
STORET was reviewed and summarized to evaluate the current conditions and trends.
Table 3. Ambient Monitoring Stations
Station ID
Agency
Location
Parameters Monitored
Collection Dates
CW-23
DHEC
Crowders Creek at SR46,
Ammonia, Nitrate &
2001 through 2014
Kendrick Rd, near
Nitrite, TKN, TP
Clover
CW-24
DHEC
Crowders Creek at
Nitrate & Nitrite, TKN, TP
2002 and 2007
Brandon Rd SR 1104
RS-13136
DHEC
Crowders Creek at SR
Ammonia, Nitrate &
2013
152, Riddle Mill Rd
Nitrite, TKN, TP
CTB 198B
DHEC
Lake Wylie at SR 274
Ammonia, Nitrate &
2001, 2002, 2007,
Charlotte Hwy
Nitrite, TKN, TP, Chl-a
2012
Fact Sheet
NPDES NC0074268
Page 3

Table 4. Data Summary
CW-23
CW-24
13136
198B
Ammonia
(1119/1)
Average
0.14
No data
0.08
0.05
Maximum
0.61
No data
0.12
0.25
Min
< 0.05
No data
0.06
< 0.02
Nitrate & Nitrite
(mg/1)
0.83
1.0
0.44
0.13
-Average
Maximum
3.6
2.3
0.72
0.82
Min
0.04
0.3
0.05
<0.02
TKN
(mg/1)
Average
0.54
0.6
0.72
0.51
Maximum
1.5
0.8
1.2
0.7
Min
0.16
0.19
0.32
0.24
TN
(mg/1)
Average
No data
1.8
1.12
No data
Maximum
No data
2.7
1.65
No data
Min
No data
0.94
0.37
No data
TF
(mg/1)
Average
0.13
0.2
0.08
No data
Maximum
1.6
0.84
0.12
No data
Min
0.02
0.04
0.04
No data
Chlorophyll -a
(ug/1)
Average
No data
No data
No data
33
Maximum
No data
No data
No data
61
Min
No data
No data
No data
15
Chlorophyll a is only monitored at station CTB 198B. Trends show declining values over the years. In
2001and 2002 one sample each year was above 40 ug/l. In 2007 two samples were above 40 ug/l. The
following graph presents the trend in chlorophyll values which show a decreasing trend. The other
parameters monitored at this station also show decreasing trends.
Station CTB 198E
Chlorophyll a
(ug/1)
70
60
50
40 .. ........
30
20
10
rl •i N N N r r n n n n n r n n N N ryry N N
N N N N N N N N N N N N N N N N N N N N
\ \ \ \ \ N m m N \ \ \ \ \ \ \ \ \ \ \ \ \ \
V1 1p rl V 00 O1 rtf l0 O N tD rl O N t0 O
Iy. DATA REVIEw
DMR Review
DMR were reviewed for the period of June 2011 to December 2015. Data are summarized in Table 1. A
review of compliance records shows excellent compliance with permit limits, no notices of violations were
issued for this facility for the review period.
Data for TSS, BOD, ammonia and fecal coliform were evaluated according to the Division's Monitoring
Frequency Reduction Guidance. All parameters meet the conditions to receive reduction in monitoring
frequency.
Fact Shect
NPDES NCO074268
Page 4

Table 5. Data Summary
Parameter
Units
Average
Max
Min
Monthly
avera a limit
Flow
MGD
2.375
10.629
1.359
6
BOD
mg/l
4.2
46.7
1.7
13
NH3N
mg/l
0.6
8.2
<0.2
2/10
TSS
mg/l
3.3
27.3
< 2.5
30
Dissolved oxygen
mg1l
1 9.1
14.1
6.7
6
H
SU
7.2
8
6.3
6-9
Temperature
°C
17.7
27
5.9
Monitor
TRC
µg/1
20.4
47.6
< 20
28
Conductivity
umhos/cm
643
856
296
Monitor
Fecal Coliform
#/100 ml
1.9
18800
< 1
200
TN (summer)
mg/1
3.84
5.88
1.58
6 mg/l
TN
mg/1
0.38
0.93
0.18
1 mg/l
Mercury Evaluation
A mercury evaluation was conducted in accordance with the permitting guidance developed for the
implementation of the statewide Mercury TMDL to determine the need for a limit and Mercury
Minimization Plan (MMP). Based on dilution the water quality based effluent limitation (WQBEL) for
mercury is 29 ng/l. The technology based effluent limit (TBEL) is 47 ng/l. None of the annual averages
exceeds the WQBEL or TBEL, therefore the existing limit will be eliminated from the effluent
requirements. The facility had detections above 1 ng/1 over the past five years, therefore a Mercury
Minimization Plan will be required in the permit. A condition will be added to the permit describing the
requirements for the MMP. See the attached mercury evaluation spreadsheet.
Table 6. Mercury Evaluation
2011
2012
2013
2014
2015
Mercury Annual Average n 1
2.1
0.9
0.9
0.9
1.0
Mercury Annual Max n 1
10.3
2.5
1.8
2.1
2.4
Number of samples
25
12
12
12
12
WQBEL
29.2 n 1
TBEL
47 ng/l
RPA:
The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality
standards, a statistical evaluation that is conducted during every permit renewal utilizing the most recent
effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44 (d) (i). The NC
RPA procedure utilizes the following: 1) 95% Confidence Level/95% Probability; 2) assumption of zero
background; 3) use of detection limit for "less than" values; and 4) streamflows used for dilution
consideration based on 15A NCAC 2B.0206. Effective April 6, 2016, NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards, dated June 10, 2016.
A reasonable potential analysis was conducted on effluent toxicant data collected between June 2011 and
September 2015. Reasonable potential was conducted for arsenic, cadmium, chromium, copper, cyanide,
lead, molybdenum, nickel, selenium, zinc and bis(2-ethylhexyl)phthalate. Based on this analysis, the
following permitting actions are proposed for this permit:
• No Limit or Monitorine: The following parameters will not receive a limit or monitoring, since
they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria
and the maximum predicted concentration was <50% of the allowable concentration: arsenic,
Fact Sheet
NPDES NC0074268
Page 5

cadmium, chromium, copper, lead, molybdenum, nickel, selenium, zinc and bis(2-
ethylhexyl)phthalate.
Monitoring_ Only. The following parameters will receive a monitor -only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/criteria, but
the maximum predicted concentration was >50% of the allowable concentration: cyanide.
A spreadsheet of the RPA results is attached to this Fact Sheet.
Priority Pollutant Analysis:
The application includes the results of three priority pollutant analyses. Chlorodibromo-methane,
chloroform and dichlorobromo-methane were detected at concentrations below the water quality criteria,
therefore no monitoring will be required for these parameters.
Aquatic Toxicity Testing_
Permit requires quarterly chronic toxicity test, ceriodaphnia dubia, at 41 %. The facility passed 17 tests out
of 17. The application included four second species toxicity tests with passing results.
F. Instream Monitoring
The permit requires instream sampling for at one upstream station and two stations downstream of the
discharge. The first downstream station is located in North Carolina; the second one is in South Carolina.
The following parameters are monitored instream: temperature, dissolved oxygen, conductivity and fecal
coliform. All parameters show consistent levels between upstream and downstream stations. Occasional
high values for fecal coliform samples were recorded at both upstream and downstream stations. Results
for fecal coliform and conductivity don't show significant variability between the two downstream
stations. Since the stream is not impaired for fecal coliform monitoring will be eliminated from the
instream requirements. Monitoring for conductivity will be modified to eliminate monitoring at the
second downstream location. Hardness was added to the upstream monitoring requirements to collect data
to calculate hardness dependent metals.
v. LIMITS AND MONITORING REQUIREMENTS:
Current conditions, as well as the basis for the limits are summarized in Table 7.
Fact Sheet
NPDES NCO074268
Page 6

Table 7. Current Conditions and Proposed Changes
Parameter
Current
Proposed Changes
Basis for Condition/Change
Limit/Condition
Flow
6 MGD
No changes
15A NCAC 2B .0505
BODS
13 mg/I MA
Monitoring frequency
Based on modeling results for
19.5 mg/1 WA
reduced from daily to
protection of DO standard
3/week
Monitoring reduction as per Division's
Guidance for Monitoring Frequency
Reduction.
NH3-N
2 mg/I MA
Monitoring frequency
DWR ammonia toxicity policy
Summer
6 mg/I WA
reduced from daily to
Monitoring reduction as per Division's
3/week
Guidance for Monitoring Frequency
Winter
10 mg/1 MA
Reduction.
30 m WA
TSS
30 mg/1 MA
Monitoring frequency
Secondary treatment standards/40 CFR
45 mg/1 WA
reduced from daily to
133 /15A NCSC 2B .0406
3/week
Monitoring reduction as per Division's
Guidance for Monitoring Frequency
Reduction.
Fecal coliform
200/100 nil MA
Monitoring frequency
State WQ standards, 15A NCAC 2B
400/100 nil WA
reduced from daily to
.0200
3/week
Monitoring reduction as per Division's
Guidance for Monitoring Frequency
Reduction.
DO
> 6 mg/I
No changes
State WQ standards, 15A NCAC 2B
.0200
pH
6 to 9 SU
No changes
State WQ standards, 15A NCAC 2B
.0200
Total residual
28 µg /I DM
No changes
State WQ standards, 15A NCAC 2B
chlorine
.0200
Total Nitrogen
6 mg/1 MA
Summer: 64,251
Lake Wylie TMDL 1995 &
lb/season
Permitting strategy 2016
Winter: 90,672
lb/season
Total Phosphorus
1 mg/1 MA
Add annual mass limit
Lake Wylie TMDL & Permitting
of 18,265 lb/yr
strategy 2016
Total Mercury
0.012 ng/I MA
Remove limits and
Statewide Mercury TMDL permitting
0.036 n DM
monitoring
strategy
Effluent Pollutant
Annual
Three times during
40 CFR 122
Scan
permit cycle
Nickel, copper, zinc,
Quarterly
Remove monitoring
No reasonable potential to exceed wqs.
silver and bis(2-
monitoring
eth lhex I)phthalate
Total cyanide
No requirement
Quarterly monitoring
Reasonable potential to exceed w s.
Fecal coliform
Instream
Remove monitoring
The stream is not impaired for fecal
monitoring
coliform.
Conductivity
Instream
Eliminated monitoring
Data shows no need for monitoring at
monitoring
at the second
two stations.
downstream station.
Hardness
No requirements
Quarterly monitoring
Data required to calculate standards for
effluent and upstream
hardness dependent metals.
Fact Sheet
NPDES NC0074208
Page 7

VI. ADDITIONAL CHANGES TO PERMIT:
1. To meet new federal regulations for electronic reporting Special Condition A.(8) was added
describing requirements for submittal of electronic DMRs.
VII. PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: January 25, 2017
Permit Scheduled to Issue: March 13, 2017
VIII. NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached
Teresa Rodriguez at 919-807-6387.
NAME: 7DATE:
/a
permit, please contact
Fact Sheet
NPDES NCO074268
Page 8

Permit No. NCO074268
NPDES Implementation of Instream Dissolved Metals Standards - Freshwater Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016, with some exceptions. Therefore, metal limits in draft
permits out to public notice after April 6, 2016 must be calculated 'to protect the new standards - as
approved.
Table 1. NC Dissolved Metals Water Ouality Standards/Aquatic Life Protection
Parameter
Acute FW, µg/1
(Dissolved)
Chronic FW, µg/1
(Dissolved)
Acute SW, µg/l
(Dissolved)
Chronic SW, µg/l
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
I Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns (as are all human health standards for all metals). It is still necessary
to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC
2B.0200 (e.g., arsenic at 10 µg/l for human health protection; cyanide at 5 µg/L and fluoride at
1.8 mg/L for aquatic life protection).
Table 2. Dissolved Freshwater Standards for Hardness -Dependent Metals
The Water Erects Ratio (WER) is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Subparagraph (11)(d)
Metal
NC Dissolved Standard, µg/I
Cadmium, Acute
WER* (I. 136672-[In hardness](0.041838)) • e^{0.9151 [in hardness]-3.1485)
Cadmium, Acute Trout waters
WER* (I. 136672-[In hardness](0.041838)) • e^{0.9151 [in hardness]-3.6236)
Cadmium, Chronic
WER*{1.101672-[In hardness](0.041838)) • e^{0.7998[In hardness]-4.4451)
Chromium III, Acute
WER*0.316 • e^{0.8190[In hardness]+3.7256)
Chromium III, Chronic
WER*0.860 • e^{0.8190[In hardness]+0.6848)
Copper, Acute
WER*0.960 • e^(0.9422[In hardness]-1.700)
Copper, Chronic
WER*0.960 • e^(0.8545[ln hardness]-1.702)
Lead, Acute
WER*{1.46203-[In hardness](0.145712)) • e^{1.273[ln hardness]-1.460)
Lead, Chronic
WER* {1.46203-[In hardness](0.145712)) • e^(1.273[in hardness]-4.705)
Nickel, Acute
WER*0.998 • e^ {0.8460[In hardness]+2.255 )
Nickel, Chronic
WER*0.997 • e^{0.8460[In hardness]+0.0584)
Page 1 of 4

Permit No. NCO074268
Silver, Acute
WER*0.85 - e^(1.72[In hardness]-6.59)
Silver, Chronic
Not applicable
Zinc, Acute
WER*0.978 • e^(0.8473[in hardness]+0.884)
Zinc, Chronic
WER*0.986 - e^(0.8473[ln hardness]+0.884)
General Information on the Reasonable Potential Analysis (RPA)
The RPA process itself did not change as the result of the new metals standards. However, application of
the dissolved and hardness -dependent standards requires additional consideration in order to establish the
numeric standard for each metal of concern of each individual discharge.
The hardness -based standards require some knowledge of the effluent and instream (upstream) hardness
and so must be calculated case -by -case for each discharge.
Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR 122.45(c). The
discharge -specific standards must be converted to the equivalent total values for use in the RPA
calculations. We will generally rely on default translator values developed for each metal (more on that
below), but it is also possible to consider case -specific translators developed in accordance with
established methodology.
RPA Permitting Guidance/WOBELs for Hardness -Dependent Metals - Freshwater
The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern,
based on recent effluent data, and calculate the allowable effluent concentrations, based on applicable
standards and the critical low -flow values for the receiving stream.
If the maximum predicted value is greater than the maximum allowed value (chronic or acute), the
discharge has reasonable potential to exceed the standard, which warrants a permit limit in most cases. If
monitoring for a particular pollutant indicates that the pollutant is not present (i.e. consistently below
detection level), then the Division may remove the monitoring requirement in the reissued permit.
1. To perform a RPA on the Freshwater hardness -dependent metals the Permit Writer compiles the
following information:
• Critical low flow of the receiving stream, 7Q 10 (the spreadsheet automatically calculates
the 1 Q 10 using the formula 1 Q 10 = 0.843 (s7Q 10, cfs) 0.993
• Effluent hardness and upstream hardness, site -specific data is preferred
• Permitted flow
• Receiving stream classification
2. In order to establish the numeric standard for each hardness -dependent metal of concern and for
each individual discharge, the Permit Writer must first determine what effluent and instream
(upstream) hardness values to use in the equations.
The permit writer reviews DMR's, Effluent Pollutant Scans, and Toxicity Test results for any
hardness data and contacts the Permittee to see if any additional data is available for instream
hardness values, upstream of the discharge.
If no hardness data is available, the permit writer may choose to do an initial evaluation using a
default hardness of 25 -mg/L (CaCO3 or (Ca + Mg)). Minimum and maximum limits on the
hardness value used for water quality calculations are 25 mg/L and 400 mg/L, respectively.
If the use of a default hardness value results in a hardness -dependent metal showing reasonable
potential, the permit writer contacts the Permittee and requests 5 site -specific effluent and
upstream hardness samples over a period of one week. The RPA is rerun using the new data.
Page 2 of 4

Permit No. NCO074268
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
_ (Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) + (s7Q 10, cfs *Avg. Upstream Hardness, mg/L)
(Permitted Flow, cfs + s7Q 10, cfs)
The Combined Hardness for acute is the same but the calculation uses the IQ 10 flow.
3. The permit writer converts the numeric standard for each metal of concern to a total recoverable
metal, using the EPA Default Partition Coefficients (DPCs) or site -specific translators, if any
have been developed using federally approved methodology.
EPA default partition coefficients or the "Fraction Dissolved" converts the value for
dissolved metal at laboratory conditions to total recoverable metal at in -stream
ambient conditions. This factor is calculated using the linear partition coefficients
found in The Metals Translator. Guidance for Calculating a Total Recoverable
Permit Limit from a Dissolved Criterion (EPA 823-B-96-007, June 1996) and the
equation:
C 1
r
Ctotal 1 + { [Kpo] [SS(l+a)] [10`6] }
Where:
ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L used,
and
Kpo and a = constants that express the equilibrium relationship between dissolved
and adsorbed forms of metals. A list of constants used for each hardness -dependent
metal can also be found in the RPA program under a sheet labeled DPCs.
4. The numeric standard for each metal of concern is divided by the default partition coefficient (or
site -specific translator) to obtain a Total Recoverable Metal at ambient conditions.
In some cases, where an EPA default partition coefficient translator does not exist (ie. silver), the
dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to
obtain a Total Recoverable Metal at ambient conditions. This method presumes that the metal is
dissolved to the same extent as it was during EPA's criteria development for metals. For more
information on conversion factors see the June, 1996 EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total allowable concentration
(permit limits) for each pollutant using the following equation:
Ca = (s7Q 10 + Qw) (Cwgs) — (s7Q 10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L)
Cb = background concentration: assume zero for all toxicants except NH3* (µg/L or mg/L)
Qw = permitted effluent flow (cfs, match s7Q 10)
s7Q 10 = summer low flow used to protect aquatic life from chronic toxicity and human
health through the consumption of water, fish, and shellfish from noncarcinogens (cfs)
* Discussions are on -going with EPA on how best to address background concentrations
Flows other than s7Q 10 may be incorporated as applicable:
IQ 10 = used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No. NC0074268
QA = used in the equation to protect human health through the consumption of water,
fish, and shellfish from carcinogens
30Q2 = used in the equation to protect aesthetic quality
6. The permit writer enters the most recent 2-3 years of effluent data for each pollutant of concern.
Data entered must have been taken within four and one-half years prior to the date of the permit
application (40 CFR 122.21). The RPA spreadsheet estimates the 95th percentile upper
concentration of each pollutant. The Predicted Max concentrations are compared to the Total
allowable concentrations to determine if a permit limit is necessary. If the predicted max exceeds
the acute or chronic Total allowable concentrations, the discharge is considered to show
reasonable potential to violate the water quality standard, and a permit limit (Total allowable
concentration) is included in the permit in accordance with the U.S. EPA Technical Support
Document for Water Quality -Based Toxics Control published in 1991.
7. When appropriate, permit writers develop facility specific compliance schedules in accordance
with the EPA Headquarters Memo dated May 10, 2007 from James Hanlon to Alexis Strauss on
40 CFR 122.47 Compliance Schedule Requirements.
8. The Total Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromium Water Quality Standards. As a cost savings measure, total chromium data
results may be used as a conservative surrogate in cases where there are no analytical results
based on chromium III or VI. In these cases, the projected maximum concentration (95th %) for
total chromium will be compared against water quality standards for chromium III and
chromium VI.
9. Effluent hardness sampling and instream hardness sampling, upstream of the discharge, are
inserted into all permits with facilities moiutoring for hardness -dependent metals to ensure the
accuracy of the permit limits and to build a more robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for this permit included:
Parameter
Value
Comments (Data Source)
Average Effluent Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
85
PPA
Average Upstream Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
25
Default
7Q 10 summer (cfs)
13.3
1 Q 10 (cfs)
11.1
Permitted Flow (MGD)
6
Date: 1/19/2017
Permit Writer:
Teresa Rodriguez
Page 4 of 4

Gastonia Outfall 001
NCO074268 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators QW = 6 MGD
Qw (MGD) = 6.00
1Q10S lets)= 11.01
7Q10S(cfs)= 13.30
7Q IOW (efs)= 20.00
30Q2 (cfs) = 28.00
Avg. Stream Flow, QA lots) = 82.00
Receiving Stream: NO HUC NUMBER
MAXIMUM DATA POINTS = 58
WWTP/WTP Class: Crowdere Creek WWTP
IWC% @ IQ10S = 45.79025111
IWC% @7QIOS= 41.15044248
IWC%@7QIOW= 31.74061433
IWC% @30Q2= 24.93297587
IW%C@QA= 10.18619934
Stream Class: C
Acute = 52.47 mg/L
Chromic = 49.69 mg/L
YOU HAVE DESIGNATED THIS RECEIVING
STREAM AS WATER SUPPLY
Effluent Hard:O val > 100 mg/L 0 val < 25 mg1L
Effluent Hard Mad = 85 mg1L
PARAMETER
STANDARDS 8 CRITERIA (2)
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
J
12
NC WQS / Applied '/z FAV /
Il # De[. Max Pod Cw Allowable Cw
(1)
itEn
Chronic Standard Acute
Acute(FW): 742.5
No RP
Arsenic
C
150 FW(7QIOs) 340
ug/L
---------------------------------------------
25 0
NO DETECTS
Chronic(FW): 364.5
Max MD_L= 1
Arsenic
C
10 HH/WS(Qavg)
ug/L
Chronic (FIH):---98.2--
-----------
Max MDL = 1
Acute: 8.402
No RP
Cadmium
NG
09914 TR(7QIOs) 3.8474
ug/L
25 U
AD DETECTS
---------------------------------------------
Chronic: 2.409
Max MDL = I
Chromium, Total
NG
µg/L
25 3
1.6
Acute: 45.99
No RP
Copper
NC
14.1738 FW(7QIOs) 21.0583
ug/L
29 29
9.36
_ _ _
_____ _ ___________ _ _ __
___
Chronic 34.'I
No value> Allowable Cw
Acute: 48.0
No RP> 50%, murder
Cyanide
NC
5 FW(7QIOs) 22
10
ug/I.
26 I
10.9
_ _ _ -- _ - _
__ _ _ _ _____
Chronic: 12.2--
No value > Allowable Cw
Acute: 377.562
No RP
Lead
NC
6.3419 FW(7QIOs) 172.8866
ug/I.
25 2
1.254
_ _ -
______._._.____________
-- --
Chronic: 15.411
No value > Allowable Cw
Acute: NO WQS
Molybdenum
NC
2000 HH(7Q10s)
ug/l.
25 23
29.5
----------------------------------------------
Chronic: 4,860.2
No value> Allowable Cw
Acute(FW): 1,370.8
No RP
Nickel
NC
66.5728 FW(7QIOs) 627.6707
µg/L
--------------------------------------
29 29
72
Chronic (FW): 161.8
No value > Allowable Cw
Nickel
NC
25.0000 WS(7QIOs)
PP[L
_ _
Chronic (WS): 60.8
No value> Allowable Cw
1
1
Acute: 1223
No RP
Selenium
NC
5 FW(7QIOs) 56
ug/L
25 0
NO DETECTS
_______ ___ _ __
.__________________________
74268 dissolved metals.xlsm, pa
Page 1 of 2 1/19/2017

Gastonia Outfall 001
NCO074268 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 6 MGD
Chronic: 12.2
Max MDL= I
Acute: 2.317
Silver
NC
0.06 FW(7QIOs) 1.0610
11g,1
29 0
NODETEC75
_ _ _ ------------------------------
Max MDL= 1
Acute: 514.5
No RP
zinc
NC
226.8127 FW(7QIOs) 235.6072
ug/L
29 29
59.8
_ _____ __
Chronic. 551.2
_________
No value > Allowable Cw
Acute: NO WQS
bisi2.ethylhexy0 phtalate
NC
0.37 HH(7QIOs)
µg/L
19 0
NO DETECTS
No RP
I
_
Chronic:----0.895i 4-
-------------------------
Max MDL= 10
Acute:
0 0
N/A
Chronic:
Acute:
0 0
N/A
Acute:
0 0
N/A
74268 dissolved metals.xlsm, r a
Page 2 of 2 1/19/2017

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY CHECK WQS
Table 1. Project Information
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
❑CHECK IF HQW OR ORW WQS
Gastonia
Crowders Creek WWTP
NCO074268
001
6.000
Crowders Creek
C
❑Apply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
CIA (cfs)
1 Q10s (cfs)
13.30
20.00
28.00
82.00
- - 11.01 _
Effluent Hardness (Median)
Upstream Hardness
Combined Hardness Chronic
.___._________
Combined Hardness Acute
85 mg/L
default 25 mg/L (Hard Aveage = 25 mg/L) e
49.69 mg/L
__.__..____ ——
52.47 m 9 /L
Data Source(s)
❑CHECK TO APPLY MODEL
Par01
Par02
Par03
Par04
Par05
Par05ll!
Par07
Par08
Par09
Parl0
Parll
Par12
Par13
Par14
Per15
Pad 6
Par17
Perlis
Parl9
Par20
Par21
Par22
Par23
Par24
Table 2. Parameters of Concern
Name was Type Chronic Monte, Acute PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic
Human Health
Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Tram
NC
0.9914
TR
3.8474
ug/L
Chlorides
Water Supply
NC
250
WS
mg/L.
Chlorinated Phenolic Compounds
Water Supply
NC
1
A
ug/L
Total Phenolic Compounds
Aquatic Life
INC,
300
A
ug/L
Chromium III
Aquatic Life
INC
206.6474
FW
1661.1554
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
pg/L
Chromium, Total
Aquatic Life
INC
N/A
FW
N/A
pg/L
Copper
Aquatic Life
NC
14.1738
FW
21.0583
ug/L
Cyanide
Aquatic Life
INC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
6.3419
FW
172.8866
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
66.5728
FW
627.6707
pg/L
Nickel
Water Supply
NC
25.0000
WS
N/A
pg/L
Selenium
Aquatic Life
INC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
1.0610
ug/L
Zinc
Aquatic Life
NC
226.8127
FW
235.6072
ug/L
bis(2-ethylhexyl) phtalale
Human Health
NC
0.37
HH
pg/L
74268 dissolved metals.xlsm, input
1/1912017

REASONABLE POTENTIAL ANALYSIS
H1
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
Effluent Hardness month avers
' 9
valves^then"Covr
.Maaimum data
Points = 58
Date Data BDL=II2DL Results
85 85 Sld Dev.
N/A
Mean
85.0000
C.V.
0.0000
n
1
10th Per value
85.00 mg/L
Median Value:
85.00 mg/L
Max. Value
85.00 mg/L
Use'PASTE SPECL
Hardness values- thon •TOF
. Maximum data
points = 58
Date Data BDL=1120L Results
25 25 Std Dev.
Mean
C.V.
n
1 Oth Per value
Average Value
Max. Value
25.0000
0.00D0
1
25.00 mg/L
25.00 mg/L
25.00 mg/L
& Par02
Arsenic
Date
Data
BDL=112DL
1
7/10/2015
<
1
0.5
2
4/10/2015
<
1
0.5
3
119/2015
<
1
0.5
4
10/304
<
1
0.5
5
713t2014
<
1
0.5
6
414/2014
<
1
0.5
7
3120/2014
<
1
0.5
8
113/2014
<
1
0.5
9
9/6/2013
<
1
0.5
10
8/2/2013
<
1
0.5
11
7/3/2013
<
1
0.5
12
8/7/2013
<
1
0.5
13
5/3/2013
<
1
0.5
14
4/5/2013
<
1
0.5
15
3/112013
<
1
0.5
16
2/2/2013
<
1
0.5
17
1/412013
<
1
0.5
18
10/5/2012
<
1
0.5
19
9/20/2012
<
1
0.5
20
7/13/2012
<
1
0.5
21
4/13/2012
<
1
0.5
22
1/6/2012
<
1
0.5
23
10/7/2011
<
1
0.5
24
7/8/2011
<
1
0.5
25
6/16/2011
<
1
0.5
26
27
28
29
30
31
32
33
34
U.'PASTE SPECL
Values" then "COP
Maximum data
Points = 58
Results
i_
Sid Dev.
0.0000
Mean
0,5000
C.V.
0.0000
n
25
Mult Factor = 1.00
Max. Value 0.5 ug/L
Max. Fred Cw 0 DETECTS ug/L
74268 dissolved metals.xlsm, data
1/19/2017

REASONABLE POTENTIAL ANALYSIS
Cadmium
Date
Data
BDL=112DL
7110/2015
<
1
0.6
4/1012015
<
1
0.5
1/9/2015
<
1
0.5
10/3//14
<
1
0.5
7/3/2014
<
1
0.5
4/4/2014
<
1
0.5
3/20/2014
<
1
0.5
1/312014
<
1
0.5
9/6/2013
<
1
0.5
8/2/2013
<
1
0.5
7/3/2013
<
1
0.5
6/7/2013
<
1
0.5
5/3/2013
<
1
0.5
4/512013
<
1
0.5
31112013
<
1
0.5
21212013
<
1
0.5
1/4/2013
<
1
0.5
10/5/2012
<
1
0.5
9/20/2012
<
1
0.5
7/1312012
<
1
0.5
4/13/2012
<
1
0.5
1/6/2012
<
1
0.5
100/2011
<
1
0.5
7/8/2011
<
1
0.5
6/16/2011
<
1
0.5
,es` then'COr
Minimum data
points = 5a
Results
E&
Std Dev.
0.0000
Mean
0.5000
C.V.
0.0000
n
25
Mult Factor = 1.00
Max. Value 0.500 ug/L
Max. Fred Cw O DETECTS ug/L
0
Chromium, Total
I values`then'Copr
. Maximum rlata
points = 5a
Date
Data
BDL=112DL
Results
711012015
<
1
0.5
Std Dev.
0.2204
4/10/2015
<
1
0.5
Mean
0.5760
1/9/2015
<
1
0.5
C.V.
0.3826
10/3//14
<
1
0.5
n
25
713/2014
<
1
0.5
4/4/2014
<
1
0.5
Mult Factor =
1.17
3/20/2014
1.4
1.4
Max. Value
1.4 ug/L
1/3/2014
1
1
Max. Fred Ow
1.6 pg/L
9/6/2013
<
1
0.5
8/2/2013
<
1
0.5
7/3/2013
<
1
0.5
6/7/2013
<
1
0.5
5/312D13
<
1
0.5
4/S12013
<
1
0.5
311/2013
<
1
0.5
2/212013
<
1
0.5
1/412013
<
1
0.5
10/5/2012
<
1
0.5
9/20/2012
<
1
0.5
7/13/2012
1
1
4/13/2012
<
1
0.5
1/6/2012
<
1
0.5
10/7/2011
<
1
0.5
7/812011
<
1
0.5
6/16/2011
<
1
0.5
Uae'PASTE er
Copper
Vaiuea•tlren•
Maxlmum,
polnb = 6
Date Data
BDL=112DL
Results
1 6/16/2011
3
3
Std Dev.
1.2296
2 7/8/2011
3.8
3.8
Mean
2.6517
3 10/7/2011
2.1
2.1
C.V.
0.4637
4 1/6/2012
3
3
n
29
5 4/13/2012
2.4
2.4
6 7/13/2012
2.2
2.2
Mult Factor =
1.17
7 9120/2012
2.2
2.2
Max. Value
8.00
8 10/5/2012
2.2
2.2
Max. Fred Cw
9.36
9 1/4/2013
1.8
1.8
10 2/212013
2.2
2.2
11 311/2013
2.4
2.4
12 4/5/2013
3
3
13 5/3/2013
2.7
2.7
14 6/7/2013
2.2
2.2
15 7/5/2013
2.2
2.2
16 8/2/2013
2
2
17 9/6/2013
1.5
1.5
18 10/4/2013
2.5
2.5
19 11/1/2013
2.7
2.7
20 12/12/2013
8
8
21 1/3/2014
1.8
1.8
22 3120/2014
2.6
2.6
23 4/4/2014
3.4
3.4
24 7/3/2014
1.5
1.5
25 1013/2014
3.4
3.4
26 119/2015
4.1
4.1
27 4/1012015
2.9
2.9
28 7/1012015
1.8
1.8
29 10/2/2015
1.3
1.3
30
31
32
33
34
_2.
74268 dissolved metals.xlsm, data
1/19/2017

REASONABLE POTENTIAL ANALYSIS
Par12
Par14
IECIAL
Dea'PASTE SPECIAL
Dee "PASTE SPECIAL
.OPY"
Cyanide
. values' then"COPY"
Lead
values"then"COPY"
fate
. Maximum dew
. Maximum data
a
Points = SB
Points - Se
1
Date
7/10/2015
Data
<
10
BDL=1/2DL
5
Results
Std Dev.
1.0002
1
Date
7/10/2015
Data
<
1
BDL=112DL
0.5
Results
Std Dev.
0.1661
2
4/10/2015
<
10
5
Mean
5.20
2
4/10/2015
<
1
0.5
Mean
0.5480
3
1/912015
<
10
5
C.V.
0.1925
3
1/9/2015
<
1
0.5
C.V.
0.3032
4
10/31/14
<
10
5
n
26
4
10/3//14
<
1
0.5
n
25
5
7/312014
<
10
5
5
7/3/2014
<
1
0.5
6
4/4/2014
<
10
5
Mult Factor =
1.08
6
4/4/2014
1.1
1.1
Mult Factor =
1.14
ug/L
7
3120/2014
<
10
5
Max. Value
10.1 ug/L
7
3/20/2014
<
1
0.5
Max. Value
1.100 ug/L
ug/L
8
1/3/2014
<
10
5
Max. Fred Cw
10.9 ug/L
8
1/3/2014
1.1
1.1
Max. Fred Cw
1.254 ug/L
9
9/6/2013
<
10
5
9
9/6/2013
<
1
0.5
10
8/2/2013
<
10
5
10
8/2/2013
<
1
0.5
11
7/3/2013
<
10
5
11
7/3/2013
<
1
0.5
12
6/7/2013
<
10
5
12
6/7/2013
<
1
0.5
13
5/3/2013
<
10
5
13
5/3/2013
<
1
0.5
14
4/5/2013
<
10
5
14
4/5/2013
<
1
0.5
15
3/112013
<
10
5
15
3/1/2013
<
1
0.5
16
2/2/2013
<
10
5
16
212/2013
<
1
0.5
17
1/4/2013
<
10
5
17
1/4/2013
<
1
0.5
18
10/5/2012
<
10
5
18
10IM012
<
1
0.5
19
9/20/2012
<
10
5
19
9/20/2012
<
1
0.5
20
7/13/2012
<
10
5
20
7/13/2012
<
1
0.5
21
4/13/2012
<
10
5
21
4/13/2012
<
1
0.5
22
1/6/2012
<
10
5
22
1/6/2012
<
1
0.5
23
10/7/2011
<
10
5
23
1017/2011
<
1
0.5
24
7/8/2011
10
10.1
24
7/8/2011
<
1
0.5
25
6/1612011
<
10
5
25
6/16/2011
<
1
0.5
26
101212015
<
10
5
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
6
IMolybdenum
Date
Data
BDL=112DL
Results
7/10/2015
1.9
1.9
Std Dev.
4/10/2015
< 10
5
Mean
1/9/2015
2.4
2.4
C.V.
10/3//14
2.2
2.2
n
7/3/2014
1.6
1.6
4/4/2014
1.5
1.5
Mult Factor=
3/20/2014
1.1
1.1
Max. Value
1/3/2014
1.2
1.2
Max. Pred Cw
9/6/2013
1.6
1.6
8/2/2013
1.8
1.8
7/3/2013
1.2
1.2
617/2013
3.1
3.1
5/3/2013
2.7
2.7
4/5/2013
1.4
1.4
3/1/2013
18.8
18.8
2/2/2013
1.3
1.3
1/4/2013
< 1
0.5
10/5/2012
1.8
1.8
9/20/2012
1.8
1.8
7/13/2012
1.1
1.1
4/13/2012
1.4
1.4
1/6/2012
1.8
1.8
10/7/2011
1.4
1.4
7/8/2011
1.4
1.4
6/16/2011
2.8
2.8
-3-
74268 dissolved metals.xlsm, data
1/19/2017

REASONABLE POTENTIAL ANALYSIS
Values" then "COPY
. Maximum data
points = so
3.5062
2.5120
1.3958
25
1.57
18.8 ug/L
29.5 ug/L
& Par18
Date
6/16/2011
7/8/2011
10/7/2011
1/6/2012
4/13/2012
7/13/2012
9/20/2012
10/512012
1/412013
2/2/2013
3/1/2013
4/5/2013
5l3/2013
6l7/2013
7/5/2013
8/2/2013
9/6/2013
10/412013
11/1/2013
12/1212013
11312014
3120/2014
41412014
713/2014
10/32014
1/9/2015
4/1012016
7/102016
10=016
Data
c
Nickel
BDL=1120L
6.4 6.4
4.4 4.4
4.2 4.2
3.8 3.8
3.8 3.8
3.2 3.2
3.6 3.6
4.1 4.1
2.2 2.2
2.6 2.6
2.8 2.8
2.4 2.4
3.1 3.1
3 3
2.6 2.6
3 3
3.6 3.6
3.8 3.8
3.2 3.2
2.6 2.6
2.1 2.1
1.7 1.7
2 2
2.2 2.2
2.2 2.2
1.9 1.9
5 2.5
2.7 2.7
2.4 2.4
Results
SW Dev
Mean
C.v.
n
Mull Factor =
Max. Value
Max. Pred Cw
Use 'PASTE SPECIAL Per19
Values" then "COPY"
. Maximum data
points =5S
3.0379
0.3236
29
1.12
6.4 Vg/L
7.2 tlg/L
Selenium
Date
Data
BDL=112DL
7/10/2015
<
1
0.5
4/10/2015
<
1
0.5
1/9/2015
<
1
0.5
10131/14
<
1
0.5
7/3/2014
<
1
0.5
4/412014
<
1
0.5
3/2012014
<
1
0.5
1/3/2014
c
1
0.5
9/6/2013
<
1
0.5
8/2/2013
<
1
0.5
713/2013
<
1
0.5
6I7I2013
<
1
0.5
5/3/2013
<
1
0.5
4/5/2013
<
1
0.5
3/1/2013
<
1
0.5
2/2/2013
<
1
0.5
1/4/2013
<
1
0.5
10/5/2012
<
1
0.5
9/2012012
<
1
0.5
7/13/2012
<
1
0.5
4/1312012
<
1
0.5
1/6/2012
<
1
0.5
10/7/2011
<
1
0.5
718/2011
<
1
0.5
6/16/2011
<
1
0.5
Use"PASTE SPECI
Valuee then"COP
. Muleteer data
Points = 0
Results
L
Std Dev,
0.0000
Mean
0.5000
C.V.
0.0000
n
25
Mult Factor = 1.00
Max. Value 0.5 ug/L
Max. Prod Cw O DETECTS ug/L
Silver
Date
Data
BDL=1/2DL
6/16/2011
<
1
0.5
7/8/2011
<
1
0.5
10/7/2011
<
1
0.5
1/6/2012
<
1
0.5
4113/2012
<
1
0.5
7/1312012
<
1
0.5
9120/2012
<
1
0.5
10/5/2012
<
1
0.5
1/412013
<
1
0.5
2/2/2013
<
1
0.5
3/1I2013
<
1
0.5
415/2013
. <
1
0.5
5/312013
<
1
0.5
6/7/2013
<
1
0.5
7/512013
<
1
0.5
8/212013
<
1
0.5
9/612013
<
1
0.5
1014/2013
<
1
0.5
11112013
<
1
0.5
12112/2013
<
1
0.5
1/312014
<
1
0.5
3/20/2014
<
1
0.5
414/2014
<
1
0.5
7/3/2014
<
1
0.5
10/3/2014
<
1
0.5
1/9/2015
<
1
0.5
4110/2015
<
1
0.5
7/102015
<
1
0.5
10122015
<
1
0.5
_4.
74268 dissolved metals.xlsm, data
1/19/2017

REASONABLE POTENTIAL ANALYSIS
Uae"PASTE SPECIAL
Use'PASTE SPECIAL
. _.
UBB"PASTE SPECIAL
Values" Man "COPY"
Zinc
Values' Nen "COPY'
bi5(2•t?thylhexyl) phtala[e
Values" men "DOPY'
.Maximum data
. Maximum data
Maximum data
points = 5a
points -So
points = 58
Results
Date
Data
BDL=1/2DL
Results
Date
Data
BDL=112DL
Results
Still Dev.
0.0000
1
6/1612011
34.4
34.4
Sid Dev.
10.1305
1 718/2011
<
10
5
Sid Dev.
1.2681
Mean
0.5000
2
718/2011
39.4
39.4
Mean
34.6034
210/7/2011
<
10
5
Mean
3.9474
C.V.
0.0000
3
1011/2011
42.1
42.1
C.V.
0.2928
3 1/6/2012
<
10
5
C.V.
0.3213
n
29
4
116/2012
44.4
44.4
n
29
4 4/13/2012
<
10
5
n
19
5
4/13/2012
53.9
53.9
5711312012
<
10
5
Mult Factor =
1.00
6
7/13/2012
45.3
45.3
Mult Factor =
1.11
61015/2012
<
5
2.5
Mult Factor=
1.20
Max. Value
0.500 ug/L
7
9120/2012
33.9
33.9
Max. Value
53.9 ug/L
7 1/4/2013
<
10
5
Max. Value
5.000000 pg/L
Max. Pred Cw
O DETECTS ug/L
8
10/5/2012
28.3
28.3
Max. Pred Cw
59.8 uglL
8 4/5/2013
<
5
2.5
Max. Fred Cw
O DETECTS pg/L
9
1/4/2013
38.5
38.5
9 7/5/2013
<
5
2.5
10
2/2/2013
29
29
1010/42013
<
5
2.5
11
3/1/2013
27.7
27.7
11 1/3/2014
<
5
2.5
12
4/5/2013
52.2
52.2
12 3/202014
<
5
2.5
13
5/3/2013
41.4
41.4
13 4/4/2014
<
5
2.5
14
6/7/2013
31.2
31.2
14 7/3/2014
<
5
2.5
15
7/5/2013
19.6
19.6
15 10/312014
<
10
5
16
812/2013
16.9
16.9
16 1/9/2015
<
10
5
17
9/6/2013
19.8
19.8
17 4/102015
<
10
5
18
10/4/2013
34.2
34.2
18 7/102015
<
10
5
19
11/1/2013
43.4
43.4
19 10/22015
<
10
5
20
12/12/2013
44.7
44.7
20
21
113/2014
47.2
47.2
21
22
3/20/2014
27.6
27.6
22
23
4/4/2014
38.5
38.5
23
24
7/3/2014
16.6
16.6
24
25
10132014
39
39
25
26
1/9/2015
26.1
26.1
26
27
4/102015
26
26
27
28
71102015
35.3
35.3
28
29
10/22015
26.9
26.9
29
30
3D
31
31
32
32
33
33
34
34
74268 dissolved metals.xlsm, data
-5- 1/19/2017

1/19/17 WQS = 12 ng/L
Facility Name: NC0074268 Gastonia Crowders Creek
Total Mercury 1631E PQL = 0.5 ng/L
Date Modifier Data Entry Value
MERCURY WQBEL/TBEL EVALUATION V:2013-5
No Limit Required
MMP Required
7Q10s = 13.300 cfs WQBEL = 29.16 ng/L
Permitted Flow = 6.000 47 ng/L
1/5/2011
1.52
1.52
1/14/2011
2.06
2.06
1/20/2011
2.38
2.38
1/24/2011
2.18
2.18
2/3/2011
2.2
2.2
2/7/2011
4.51
4.51
2/17/2011
3.04
3.04
2/23/2011
5.58
5.58
3/2/2011
5.74
5.74
3/8/2011
10.28
10.28
3/18/2011
1.48
1.48
3/22/2011
1.09
1.09
3/29/2011
<
1
0.5
4/6/2011
<
1
0.5
4/15/2011
1.98
1.98
4/18/2011
1.72
1.72
4/26/2011
<
1
0.5
5/2/2011
<
1
0.5
6/16/2011
1.28
1.28
7/1 /2011
1.26
1.26
8/1/2011
<
1
0.5
9/9/2011
<
1
0.5
10/3/2011
<
1
0.5
11/2/2011
1.08
1.08
12/1/2011
<
1
0.5
2.1 ng/L - Annual Average for 2011
1/6/2012
1.12
1.12
2/1/2012
<
1
0.5
3/1/2012
2.52
2.52
4/9/2012
<
1
0.5
5/1/2012
<
1
0.5
6/1/2012
<
1
0.5
7/3/2012
<
1
0.5
8/1/2012
<
1
0.5
9/20/2012
1.53
1.53
10/4/2012
<
1
0.5
11 /26/2012
1.12
1.12
12/27/2012
<
1
0.5
0.9 ng/L- Annual Average for 2012
1/29/2013
1.06
1.06
2/5/2013
1.36
1.36
3/22/2013
<
1
0.5
4/9/2013
<
1
0.5
5/24/2013
1.86
1.86
6/2412013
<
1
0.5
7/25/2013
<
1
0.5
8/30/2013
<
1
0.5

9/26/2013
<
1
0.5
10/22/2013
<
1
0.5
11/18/2013
1.07
1.07
12/12/2013
1.74
1.74
0.9 ng/L- Annual Average for 2013
1/31/2014
2.06
2.06
2/25/2014
<
1
0.5
3/20/2014
1.38
1.38
4/28/2014
<
1
0.5
5/27/2014
<
1
0.5
6/26/2014
<
1
0.5
7/25/2014
<
1
0.5
8/6/2014
<
1
0.5
9/30/2014
<
0.5
0.5
10/17/2014
1.51
1.51
11 /24/2014
1.98
1.98
12/30/2014
<
1
0.5
0.9 ng/L- Annual Average for 2014
1/30/2015
1.24
1.24
2/23/2015
1.31
1.31
3/17/2015
1.06
1.06
4/21/2015
2.42
2.42
5/26/2015
1.1
1.1
6/29/2015
<
1
0.5
7/28/2015
<
1
0.5
8/27/15
<
1
0.5
9/14/15
<
1
0.5
10/26/15
<
1
0.5
11/25/15
0.72
0.72
12/29/15
1.42
1.42
1.0 ng/L- Annual Average for 2015

To: Complex Permitting Unit
Attention: Teresa Rodriquez
SOC Priority Project: No
Date: May 13, 2015
NPDES STAFF REPORT AND RECOMMENDATIONS
County: Gaston
NPDES Permit No.: NCO074268
PART I - GENERAL INFORMATION
1. Facility and Address: Crowders Creek WWTP Physical Location
City of Gastonia 5642 York Highway RECEIVEDIDENRIDWR
PO Box 1748 South of Gastonia
Gastonia, N.C. 28053-1748
PLAY 2 1 2015
2. Date of Investigation: May 12, 2015 Water Quality
Permitting Section
3. Report Prepared By: Wes Bell, Environmental Specialist
4. Person Contacted and Telephone Number: Sibyl Brotherton/ORC [phone] and David
Shellenbarger/Asst. Division Manager of Compliance [phone]
5. Directions to Site: From the junction of Interstate I-85 S and Exit 17 (US-321 S/N Chester Street), turn
right on US-321 S/Chester Street/York Highway for approximately 9 miles and turn right on the
WWTP's driveway (just after crossing the bridge over Crowders Creek).
6. Discharge Point(s), List for all discharge Point:
Outfall 001 (Google Earth)
Latitude: 35010' 10"
Longitude: 810 11' 46"
See USGS Map included with the renewal application for specific location of the outfall.
USGS Quad No.: G 14 NW
7. Receiving Stream or Affected Surface Waters: Crowders Creek
a. Classification: C
b. River Basin and Subbasin No.: Catawba 03-08-37
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
a. Volume of wastewater and description of wastewater source(s) of each outfall:
Outfall 001— 6.0 MGD — domestic and industrial (8 SIUs with 4 being CIUs). The existing W WT
facilities consist of mechanical bar screen with manual bypass, instrumented flow measurement, grit
removal, influent pump station, dual primary clarifiers, dual biological nutrient removal trains
(anaerobic/anoxic/oxic cells), dual secondary clarifiers, dual polishing ponds, gas chlorination, gas
dechlorination, post aeration, dual DAF units, anaerobic digestion, and standby power.

Page Two
b. Pretreatment Program: The City implements an approved pretreatment program.
PART III - OTHER PERTINENT INFORMATION
Special monitoring or limitations (including toxicity) requests:
The City requests the following permit changes:
1) Total Nitrogen and Total Phosphorus limits be expressed as lbs/day limits and nutrient credits be
applied to this permit for the previous connection of the City of Bessemer City W WTP that was
previously detailed/requested in the City of Gastonia's letter to the Division dated 6/23/14 (letter
attached to the renewal package).
2) Reduction of the effluent monitoring frequencies for BOD, TSS, ammonia, and fecal coliform
according to the Division's criteria for exceptionally performing facilities (data attached to
renewal package).
3) Reduction bf the instream monitoring requirements to once per week year-round.
4) Reduction of the monthly monitoring requirement for effluent mercury to quarterly and the
removal of the effluent mercury limit.
5) Removal of the quarterly monitoring requirement for effluent bis(2-ethylhexy)phthalate.
6) Removal of the quarterly monitoring requirements for effluent nickel, copper, and silver.
PART IV - EVALUATION AND RECOMMENDATIONS
The WWTP appeared to be properly operated and well maintained at the time of the inspection. The
WWTP's effluent was clear with no suspended solids or foam with fish being observed in the effluent
discharge. City personnel have previously discussed with the Division's Permitting Staff regarding the
incorporation of nutrient limits and credits for the NPDES facilities that have or will soon to be connected to the
City's WWTPs. It is recommended that the subject Permit be renewed following review by the Division's
Complex Permitting Staff.
Signature o eport Preparer Date
Water Quality Regional Supervisor Date

v,C) emcee-dar�-
oi
Q.nf'S - �l

6R ul!�
KeVI eVv /
Two vE Rs
UTILITIES
We are TRU to our customersl _
6 (Z7/Z-,O 1Y I O,�
June 23, 2014 No 1")'T wit � (� ` �`
�a NA 4-e A � j �%rod/ �
4-0
Mike Templeton e V
Division of Water Resources "Wastewater Branch r1 /(yO to
1601 Mail Service Center
Raleigh, NC 27699-1601 r ( _ h l L/
RE: NPDES Permit Renewals for Two Rivers Utilities' W WTPs included in the Lake Wylie TMDL
Long Creek Wastewater Treatment Plant (NPDES # NC0020184)
Eagle Road Wastewater Treatment Plant (NPDES# NC0006033)
Crowders Creek Wastewater Treatment Plant (NPDES # NC0074268)
Dear Mr. Templeton:
The NPDES Permits for wastewater treatment plants owned by Two Rivers Utilities (TRU) are due for
renewal in 2015 [Long Creek WWTP (NC0020184) and Eagle Road WWTP (NC0006033) expire on
1/31/15 and Crowders Creek WWTP (NC0074268) expires on 8/31/15]. All three TRU wastewater
facilities are part of the Lake Wylie TMDL for Total Nitrogen (TN) and Total Phosphorus (TP).
TRU has built and operated modern nutrient removal processes which have greatly reduced nutrient
loads to the Lake Wylie watershed. Through regionalization efforts by TRU, five non -nutrient removal
treatment plants have been taken out of service. Projects that will decommission three more non -
nutrient removal facilities are underway.. This wastewater is or will be treated at one of TRU's nutrient
removal facilities; further reducing the nutrient loads into the Lake Wylie watershed.
To help these regionalization efforts make practical and long-term financial sense for our utility, TRU is
requesting revisions to nutrient limits at Itsfacilities with these permit renewals:
TRU requests:
• Allocations from the decommissioned facilities (whether specifically allocated or part of the
non -point allocation) are transferred to the TRU facility that receives its wastewater (provided it
discharges to the same arm).
• Instead of the current concentration limits, we request these allocations be presented in
pounds/day mass load limits and that an aggregate / bubble limit be given to Long Creek WWTP
and Eagle Road WWTP for Total Nitrogen (TN) and Total Phosphorus (TP).

History:
All WWTP discharges are currently included in the Lake Wylie TMDL. When the TMDL was developed,
large plants (greater than 1.0 mgd) were given a specific allocation as part of the Lake Wylie TMDL, and
small plants (less than 1.0 mgd) were included in the non -point allocation.
A summary of the decommissioned facilities is shown below:
Summary of Decommissioned Facilities
Potential
TN
Regional
Permitted
Summer
(lb/yr)2
TP
WWTP
Year
Status
WWTP
Flow
TN Limit
(lb/d)'
(mgd)
(lb/d)2
Ranlo
1998
Complete
Long Creek
0.20
10
5,164
1.7
High Shoals
2012
Complete
Long Creek
0.03
2
775
0.3
Stanley
2015
Construction
Long Creek
0.50
25
12,910
4.2
McAdenville
2016
Design
Long Creek
0.13
7
3,357
1.1
Pharr Yarns
2016
Design
Long Creek
1.0
50
25,821
8.3
Bessemer
Crowders
City"
2002
Complete
Creek
1.5
75
13
Catawba
Creek
1999
Complete
Long Creek
9.0
300
38
'Calculated using permitted flow and 6.0 mg/L for the summer months
2Calculated using 6.0 mg/L in the summer (214 days) and 12.0 mg/L in the winter (151 days) —same
Best Professional Judgment (BPJ) methodology used for Eagle Road WWTP annual mass load for TN
3Calculated using 1.0 mg/L year round
4 Lake Wylie TMDL allocation
The City of Gastonia's Catawba Creek WWTP was decommissioned and its flow routed to the Long Creek
WWTP. No request is being made at this time for the transfer of that TMDL allocation of 300 Ibs/day of
TN and 38 Ibs/day of TP. However, since the flow is treated at the Long Creek WWTP, we wish to
document the decommissioning of that facility potentially made a major contribution to the overall
nutrient reduction in the Lake Wylie watershed.
TRU and HDR staff met previously with DWR staff in Raleigh in August 2010 and August 2013 to discuss
the renewal of the NPDES permits. Meeting minutes for both meetings were recorded and submitted to
all attendees. During both of those meetings, as well as on subsequent phone conversations, the topic
of receiving "credit" in the form of a higher nutrient allocation in exchange for taking these smaller
W WTPs out of service was discussed. An aggregate / bubble limit for Long Creek WWTP and Eagle Road
W WTP for TN and TP was also discussed. DWR stated that both of these requests were reasonable, met
the intent of the TMDL, and could be implemented in the next NPDES permit renewals.
Page 2 of 5

Quantitative Justification:
The Long Creek, Eagle Road, Stanley, McAdenviile and Pharr Yarns wastewater treatment plants all
discharge into the South Fork Arm in the Lake Wylie TMDL. The former Ranlo WWTP and both of High
Shoals' wastewater facilities, discharged into that arm as well. Since TRU operates both the Long Creek
WWTP and Eagle Road WWTP, we are requesting an aggregate or bubble mass load limit between the
two treatment facilities for TN and TP.
While only the Long Creek WWTP and Eagle Road WWTP were given specific allocations in the TMDL,
the other -facilities were included in the non -point nutrient allocation. If these non -specifically allocated
facilities were discharging at 6 mg/L TN in the summer months and 12 mg/L TN in the winter months,
and 1 mg/L TP year-round, they would have the potential to discharge a combined total of 132 lbs/day
of TN and 15.5 Ibs/day of TP. Since the Long Creek WWTP is receiving the flow from these facilities, we
request that these pounds be included in the aggregate allocation for Long Creek and Eagle Road
WWTPs. The pounds are based on the limits they could potentially have received, not the higher
concentrations that they were actually discharging.
TOTAL NITROGEN:
Permitted
TMDL
Calculated Ibs/year at 6
South Fork Arm of TMDL
Flow
Allocation
mg/I summer &
Plant
(mgd)
(Ibs/day)
12 mg/L winter
Long Creek
16
801
4130130
Eagle Road
4.0
*
103,283
Ranlo
0.2
*
5,164
High Shoals
0.03
*
775
Stanley
0.5
*
12,910
McAdenville
0.13
*
3,357
Pharr Yarns
1.0
*
25,821
Total:
564,439
*Included in Non -Point Allocation
Permitted
TMDL
Calculated Ibs/year at
/kowders Arm of TMDL
Flow
Allocation
6,,mg/I summer.&
Plant
(mgd)
(Ibs/day)
12 mg/L winter -
Crowders Creek
6.0
300
154,924
Bessemer City
1.5,
75
38,731
Total:
193,655
Page 3 of 5

TOTAL PHOSPHORUS:
South Fork Arm of TMDL
Plant
Long Creek
Eagle Road
Ranlo
High Shoals
Stanley
McAdenville
Pharr Yarns
Permitted
TMDL
Flow
Allocation
Calculated Ibs/day
Calculated Ibs/year at
(mgd)
(Ibs/day)
at 1 mg/L
1 mg/Lyear-round
16
133
133
48,545
4.0
90**
33**
12,045
0.2
*
1.7
621
0.03
*
0.25
91
0.5
*
4.2
1,533 -
0.13
*
1.1
402
1.0
*
8.3
3,030
Total: 182 66,266
* Included in Non -Point Allocation
**instead of the 90 Ibs/day allocation in the TMDL, only amount currently permitted is being requested.
Permitted
TMDL
Crowders Arm of TMDL,
Flow
Allocation
Plant
(mgd)
(lbs/day)
Crowders Creek
6.0
SO
Bessemer City
1.5
13
Total:
63
Re nest:
In summary, we request limitations for total nitrogen and total phosphorus expressed as follows:
LONG CREEK WWTP (NPDES #NC0020184) & EAGLE ROAD WWTP (NPDES #NC0006033)
Parameter
Limits
iMonitoring Requirements
Monthly
Weekly
Daily
Measurement
Sample
Sample
Average
Average
Maximum
Frequency
Type
Location
Total Nitrogen
Annual Limit:
Weekly
Composite
Effluent
564,439 pounds/years
Total Phosphorus
182
Ibs/dayz
Weekly
Composite
Effluent
1. The annual limit will be the combined sum of the monthly mass loadings from both Long Creek WWTP
(NPDES #NC0020184) and Eagle Road WWTP (NPDES #NC0006033), and all decommissioned WWTPs.
2. Monthly average limit for Total Phosphorus is for the combined total of the discharge from Long Creek
WWTP (NPDES #NC0020184) and Eagle Road WWTP (NPDES #NC0006033), and all decommissioned
WWTPs. This will be computed as the sum of the monthly averages in ibs/day from each discharge.
Page 4 of 5

CRO W DERS CREEK W WTP (N PDES HNC0074268)
Parameter
Limits
Monitoring Requirements
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Total Nitrogen
Annual Limit: 193,265
pounds/year'
Weekly
Composite
Effluent
Total Phosphorus
63 Ibs/day
Weekly
Composite
Effluent
Notes:
1. The annual limit will be the combined sum of the monthly mass loadings from both Crowders Creek
W WTP (NPDES HNC0020184) and Bessemer City WWTP.
We greatly appreciate your openness to consider these permit modifications. Once you have had a
chance to review this request, we would like to have the opportunity to discuss it further. We will
contact you to schedule a meeting in July.
Sincerely,
Matt Ber ardt
Director
Two Rivers Utilities
cc: Tom Belnick, DWR
Kathy Stecker, DWR
Larry Cummings, TRU Wastewater Treatment
Page 5 of 5

Belnick, Tom
From:
Knosby, Mary [[e-mail]]
Sent:
Wednesday, June 25, 2014 11:19 AM
To:
Templeton, Mike
Cc:
Bernhardt, Matt; Cummings, Larry ([e-mail]); Shellenbarger, David;
Belnick, Tom; Stecker, Kathy; Bailey, Erika L.
Subject:
Two Rivers Utilities --- NPDES Permit Renewals
Attachments:
Ltr M_Templeton_DWR 06-23-2014.pdf
Hi Mike,
Per our discussion this morning, on behalf of Two Rivers Utilities (TRU), I am submitting this letter regarding NPDES
permit renewals for your consideration.
The NPDES Permits for Long Creek WWTP, Eagle Road WWTP, and Crowders Creek WWTP expire in 2015 and will
begin the renewal process soon. These plants are part of the Lake Wylie TMDL for Total Nitrogen (TN) and Total
Phosphorus (TP).
Through regionalization efforts by TRU, five (5) non -nutrient removal treatment plants have been taken out of service.
Projects that will decommission three (3) more non -nutrient removal facilities are underway. This wastewater is or will be
treated at one of TRU's nutrient removal facilities, further reducing the nutrient loads into the Lake Wylie watershed.
TRU is requesting revisions to nutrient limits at its facilities with these permit renewals to provide more flexibility, and to
help the regionalization efforts make practical and long-term financial sense.
• Allocations from the decommissioned facilities (whether specifically allocated or part of the non -point allocation).
are transferred to the TRU facility that receives its wastewater (provided it discharges to the same arm).
• Instead of the current concentration limits, we request these allocations be presented in pounds/day mass load
limits and that an aggregate / bubble limit be given to Long Creek WWTP and Eagle Road WWTP for TN and TP.
We would like to meet with your team to discuss this further, as TRU prepares their renewal applications.
Available dates for us to travel to Raleigh are:
July 14
July 21
July 22
Time is flexible.
Please let me know if you have any questions, and if one of these dates for a meeting works for DWR.
Thanks,
Mary
Mary Knosby, PE
Associate Vice -President
HDR
440 S. Church St, Suite 1000
Charlotte, NC 28202
D 704.338.6857 M 704.507.9497
Ma[yXnosby .hdrinc.com
hdrinc.com/follow-us

Mike Templeton
Division of Water Resources — Wastewater Branch
1601 Mail Service Center
Raleigh, NC 27699-1601
RE: NPDES Permit Renewals for Two Rivers Utilities' W WTPs included In the Lake Wylie TMDL
Long Creek Wastewater Treatment Plant (NPDES # NC0020184)
Eagle Road Wastewater Treatment Plant (NPDES # NC0006033)
Crowders Creek Wastewater Treatment Plant (NPDES # NC0074268)
Dear Mr. Templeton:
The NPDES Permits for wastewater treatment plants owned by Two Rivers Utilities (TRU) are due for
renewal in 2015 [Long Creek WWTP (NC0020184) and Eagle Road WWTP (NC0006033) expire on
1/31/15 and Crowders Creek WWTP (NC0074268) expires on 8/31/15). All three TRU wastewater
facilities are part of the Lake Wylie TMDL for Total Nitrogen (TN) and Total Phosphorus (TP).
TRU has built and operated modern nutrient removal processes which have greatly reduced nutrient
loads to the Lake Wylie watershed. Through regionalization efforts by TRU, five non -nutrient removal
treatment plants have been taken out of service. Projects that will decommission three more non -
nutrient removal facilities are underway. This wastewater is or will be treated at one of TRU's nutrient
removal facilities, further reducing the nutrient loads into the Lake Wylie watershed.
To help these regionalization efforts make practical and long-term financial sense for our utility, TRU is
requesting revisions to nutrient limits at its facilities with these permit renewals.
TRU requests:
• Allocations from the decommissioned facilities (whether specifically allocated or part of the
non -point allocation) are transferred to the TRU facility that receives its wastewater (provided it
discharges to the same arm).
• Instead of the current concentration limits, we request these allocations be presented in
pounds/day mass load limits and that an aggregate / bubble limit be given to Long Creek WWTP
id Eagle Road WWTP for Total Nitrogen (TN) and Total Phosphorus (TP).

H isto :
All WWTP discharges are currently included in the Lake Wylie TMDL. When the TMDL was developed,
large plants (greater than 1.0 mgd) were given a specific allocation as part of the Lake Wylie TMDL, and
small plants (less than 1.0 mgd) were included in the non -point allocation.
A summary of the decommissioned facilities is shown below:
Summary of Decommissioned Facilities
Permitted
Potential
TN
WWTP
Year
Status
Regional
Summer
(lb/yr)x
TP
WWTP
(mgd)
(mgd)
TN Limit
(Ib/d}3
(lb/d)'
Ranlo
1998
Complete
Long Creek
0.20
10
5,164
1.7
High Shoals
2012
Complete
Long Creek
0.03
2
775
0.3
Stanley
2015
Construction
Long Creek
0.50
25
12,910
4.2
McAdenville
2016
Design
Long Creek
0.13
7
3,357
1.1
Pharr Yarns
2016
Design
Long Creek
1.0
50
25,821
8.3
Bessemer
City4
2002
Complete
Crowders
Creek
1.5
75
13
Catawba
Creekataw
1999
Complete
Long Creek
9.0
300
38
`Calculated using permitted flow and 6.0 mg/L for the summer months
2Calculated using 6.0 mg/L in the summer (214 days) and 12.0 mg/L in the winter (151 days) —same
Best Professional Judgment (BPJ) methodology used for Eagle Road WWTP annual mass load for TN
3Calculated using 1.0 mg/L year round
4 Lake Wylie TM DL allocation
The City of Gastonia's Catawba Creek WWTP was decommissioned and its flow routed to the Long Creek
WWTP. No request is being made at this time for the transfer of that TMDL allocation of 300 lbs/day of
TN and 38 lbs/day of TP. However, since the flow is treated at the Long Creek WWTP, we wish to
document the decommissioning of that facility potentially made a major contribution to the overall
nutrient reduction in the Lake Wylie watershed.
TRU and HDR staff met previously with DWR staff in Raleigh in August 2010 and August 2013 to discuss
the renewal of the NPDES permits. Meeting minutes for both meetings were recorded and submitted to
all attendees. During both of those meetings, as well as on subsequent phone conversations, the topic
of receiving "credit" in the form of a higher nutrient allocation in exchange for taking these smaller
WWTPs out of service was discussed. An aggregate / bubble limit for long Creek WWTP and Eagle Road
WWTP for TN and TP was also discussed. DWR stated that both of these requests were reasonable, met
the intent of the TMDL, and could be implemented in the next NPDES permit renewals.
Page 2 of 5

Quantitative Justification:
The Long Creek, Eagle Road, Stanley, McAdenville and Pharr Yarns wastewater treatment plants all
discharge into the South Fork Arm in the Lake Wylie TMDL. The former Ranlo WWTP and both of High
Shoals' wastewater facilities, discharged into that arm as well. Since TRU operates both the Long Creek
WWTP and Eagle Road WWTP, we are requesting an aggregate or bubble mass load limit between the
two treatment facilities for TN and TP.
While only the Long Creek WWTP and Eagle Road WWTP were given specific allocations in the TMDL,
the other -facilities were included in'the non -point nutrient allocation. If these non -specifically allocated
facilities were discharging at 6 mg/L TN in the summer months and 12 mg/L TN in the winter months,
and 1 mg/L TP year-round, they would have the potential to discharge a combined total of 132 lbs/day
of TN and 15.5 Ibs/day of TP. Since the Long Creek WWTP is receiving the flow from these facilities, we
request that these pounds be included in the aggregate allocation for Long Creek and Eagle Road
WWTPs. The pounds are based on the limits they could potentially have received, not the higher
concentrations that they were actually discharging.
TOTAL NITROGEN:
Permitted
TMDL
Calculated Ibs/year at 6
South Fork Arm of TMDL
Flow
Allocation
mg/I summer &
Plant
(mgd)
(Ibs/day)
1.2 mg/L winter
Long Creek
16
801
413,130
Eagle Road
4.0
*
103,283
Ranlo
0.2
*
50164
High Shoals
0.03
*
775
Stanley
0.5
*
12,910
McAdenville
0.13
*
3,357
Pharr Yarns
1.0
*
25,821
Total:
564,439
*Included in Non -Point Allocation
Permitted
TMDL
Calculated Ibs/year at
Crowders Arm of TMDL
Flow
Allocation
6 mg/I summer &
Plant
(mgd)
(Ibs/day)
12 mg/L winter
Crowders Creek
6.0
300
154,924
Bessemer City
1.5
75
38,731
Total:
193,655
Page 3 of 5

TOTAL PHOSPHORUS:
South Fork Arm of TMDL
Plant
Long Creek
Eagle Road
Ranlo
High Shoals
Stanley
McAdenville
Pharr Yarns
Permitted
TMDL
Flow
Allocation
Calculated Ibs/day
Calculated Ibs/year at
(mgd)
(Ibs/day)
at 1 mg/L
1 mg/L year-round
16
133
133
48,545
4.0
90**
33**
12,045
0.2
*
1.7
621
0.03
*
0.25
91
0.5
*
4.2
1,533
0.13
*
1.1
402
1.0
*
8.3
3,030
Total: 182 66,266
* Included In Non -Point Allocation
**Instead of the 90 Ibs/day allocation in the TMDL, only amount currently permitted is being requested.
Permitted
TMDL
Crowders Arm of TMDL
Flow
Allocation
Plant
(mgd)
(Ibs/day)
Crowders Creek
6.0
50
Bessemer City
2.5
13
Total:
63
Re uest:
In summary, we request limitations for total nitrogen and total phosphorus expressed as follows:
LONG CREEK WWTP (NPDES #NC0020184) & EAGLE ROAD WWTP (NPDES #NC0006033)
Parameter
Limits
Monitoring Requirements
Monthly
Weekly
Daily
Measurement
Sample
Sample
Average
Average
Maximum
Frequency
Type
Location
Total Nitrogen
Annual Limit:
Weekly
Composite
Effluent
564,439 pounds/year'
Total Phosphorus
182
Weekly
Composite
Effluent
Ibs/dayZ
Notes:
1. The annual limit will be the combined sum of the monthly mass loadings from both Long Creek WWTP
(NPDES #NC0020184) and Eagle Road WWTP (NPDES #NC0006033), and all decommissioned WWTPs.
2. Monthly average limit for Total Phosphorus is for the combined total of the discharge from Long Creek
WWTP (NPDES #NC0020184) and Eagle Road WWTP (NPDES #NC0006033), and all decommissioned
WWTPs. This will be computed as the sum of the monthly averages in Ibs/day from each discharge.
Page 4 of 5

CROWDERS CREEK WWTP (NPDES #NC0074268)
Parameter
Limits
Monitoring Requirements
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Total Nitrogen
Annual Limit:193,265
pounds/year'
Weekly
Composite
Effluent
Total Phosphorus
63 Ibs/day
Weekly
Composite
Effluent
Notes:
1. The annual limit will be the combined sum of the monthly mass loadings from both Crowders Creek
WWTP (NPDES #NC0020184) and Bessemer City WWTP.
We greatly appreciate your openness to consider these permit modifications. Once you have had a
chance to review this request, we would like to have the opportunity to discuss it further. We will
contact you to schedule a meeting in July.
Sincerely,
Matt Ber ardt
Director
Two Rivers Utilities
cc: Tom Belnick, DWR
Kathy Stecker, DWR
Larry Cummings, TRU Wastewater Treatment
Page 5 of 5

��
..k
We are TRU to ourcustomers!
Division of Water Resources
WQ Permitting Section - NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
February 27, 2014
Re: Renewal Application of NPDES Permits
Crowders Creek Wastewater Treatment Plant (NPDES #NC0074268)
Dear Sir or Madam:
Please find attached, the renewal application for the City of Gastonia's National Pollutant Discharge
Elimination System (NPDES) Permit #NC0074268 for the Crowders Creek Wastewater Treatment
Plant. This permit renewal application with attachments is being submitted by the March 4, 2015
deadline to comply with the requirement to apply 180 days prior to the date of permit expiration
�► (August 31, 2015). As requested, please find the original signed version of this information along
.� with two copies. A copy of this cover letter is included inside each packet.
The Crowders Creek Wastewater Treatment Plant continues to operate as a secondary treatment
biological nutrient removal plant which treats municipal wastewater for the City of Gastonia and
surrounding area. Since the last permit renewal request, numerous maintenance items and minor
�► upgrades have taken place throughout the facility. Authorizations to construct have been obtained
,.,, where appropriate. Examples of these upgrades are shown below and more information can be
provided if desired:
• Installed connection allowing for potable water to be used in place of internal reuse water.
This use facilitates flushing of water system lines in the area.
• Automated pumping of Return and Waste Activated Sludge (RAS/WAS).
�► • Installed vault providing access to secondary effluent line.
., • Replaced emergency backup generator #3 with larger size (500 kwH) allowing for full
backup power to digesters and laboratory/control building.
All analyses have been tested by North Carolina certified laboratories in accordance with 40 CFR
Part 136 requirements. Efforts have been made to obtain seasonal variation in the sampling as

•► much as was possible. This application includes all data gathered forth e last three years (January
,,k 1, 2012 through December 31, 2014).
^ With this permit renewal, we respectfully request the following changes to our permit:
^
• As discussed with Mr. Mike Te,npleton, Mr. Tom Belnick and Ms. Kathy Stecker, and as
.n.
outlined in a 6/23/14 letter to Mr. Templeton; we request that limits for Total Nitrogen
and Total Phosphorus for this facility be expressed as Ibs/day limits. We also request
*► that credit be applied to this Ibs/day limit for the Bessemer City Wastewater Treatment
,., Plant. An allocation for total nitrogen and total phosphorus is given to the Bessemer
^ City WWTP in the Lake Wylie TMDL, but the plant has been decommissioned and the
flow is being treated at the Crowders Creek WWTP. A copy of the 6/23/14 letter with
^ details of this request is included in the back of the permit renewal packet.
^ • Data for the last three years has been evaluated, and the Crowders WWTP meets the
�. requirements for reduction in monitoring frequencies in NPDES Permits for
., exceptionally performing facilities as outlined in DENR's October 22, 2012 policy
^ statement. In accordance with this policy, we are requesting that the minimum
required monitoring frequency for BODs, TSS, NH3-N and fecal coliform be reduced to 2x
a week. A copy of the data used for this evaluation is attached in the back of this permit
^% renewal packet.
.. • Upstream and downstream monitoring has not shown a noticeable impact from the
treatment plant discharge, but can be burdensome to perform while maintaining
staffing requirements at the treatment plant — particularly when required three times a
^ week in the summer. We regc 2st that the upstream and downstream monitoring
^ requirements be reduced to once -per -week year-round.
^ • Quarterly monitoring for Nickel, Copper, Zinc and Silver at the Crowders Creek WWTP
N% effluent have shown results summarized below for the last three years. We request
,^ that these monitoring frequency requirements be removed.
.•k Average Concentration Maximum Concentration
Nickel 2.9 µg/L 4.1 µg/L
Copper 2.6 µg/L 8.0 µg/L
^ Zinc 35.2 µg/ 53.9 µg/L
Silver <1.0 µg/L <1.0 µg/L
AM*
^
• Monthly monitoring for mercury at the Crowders Creek WWTP effluent showed an
^
average mercury concentration of only 0.0004 µg/L and a maximum concentration of
0.0025 µg/L. We request that this monitoring frequency requirement be reduced to
quarterly and the permit limit be removed.
• Quarterly monitoring for bis(2-ethlyhexyl)phthalate has shown only one detectable
'^
result in the last three years. This result of 14.7 µg/L was from a sample collected by
.w
pumping through flexible tubing using a peristaltic pump. The fourteen samples taken
since changing to collecting the samples by dippers have all been below detectable
levels. Since bis(2-ethylhexyl)phthalate is commonly used as a plasticizer, we believe
^
the tubing used at the time was the source of the bis(2-ethlyhexyl)phthalate instead of

.� actually being present in the effluent discharge. We request this monitoring frequency
Ak requirement be removed.
Oak Two Rivers Utilities remains committed to good environmental stewardship and take our
Ak obligation to protect the receiving stream very seriously. We request these changes in the
Ak NPDES permits in order to allow us to focus on other environmental issues (such as removing
,. the problematic discharges from some smaller municipalities) while not overburdening our rate
payers. If I can provide any additional information or assistance regarding this application or
these requests, please feel free to contact me at 704-842-5106 or [e-mail].
Sincerely,
David Shellenbarger
AssistantWWTDManager- Compliance
.� Wastewater Treatment Division
Two Rivers Utilities
Aft cc: Stephanie Scheringer— Division Manager Wastewater Treatment, TRU
Sibyl Brotherton —Senior Plant Operator— Crowders Creek WWTP, TRU
Certified Mail: 7009 0820 00015800 6981
Ak
Ak
oft
AW
n.,
Oak

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FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Crowders Creek WWTP, NCO074268
Renewal
Catawba River Basin
Additional Information for NPDES Permit Application
^► Section B.3. Process Flow Diagram or Schematic
Process Flow Description
_ The Crowders Creek WWTP is a 6-MGD facility operated by the City of Gastonia which
.�. discharges to Crowders Creek. Influent wastewater enters the plant through a 42" gravity
,^ feed sewer line and passes through coarse manual and one inch mechanical screens then
.� to a grit screw collector. Following preliminary treatment, the flow enters the main lift
station. Four influent pumps lift the influent flow to a splitter box where the flow is split
A% to two primary clarifiers. The primary clarifier effluent is combined with the return
activated sludge (RAS) in a second splitter box where the flow is split to two biological
n►
r treatment trains. The biological treatment follows a modified Ludzak-Ettinger process
1^ and consists of anaerobic, anoxic and oxic basins, with optional step feed and internal
r�► oxic recycle pumping for denitrification. Following the biological treatment process,
flow is combined in a third splitter box and routed to the two final clarifiers. Sludge from
these clarifiers is routed to the second splitter box as RAS or thickened in a dissolved air
AWA floatation thickener (DAFT) and sent to the anaerobic digesters as waste activated sludge
(WAS). The effluent flow from these final clarifiers is again combined then split to two
polishing ponds. Effluent from these polishing ponds is disinfected in an open chlorine
,., contact chamber by injection of chlorine solution. Sulfur dioxide is injected into the
Aft chlorinated effluent for dechlorination. Finally, the effluent is discharged through a
Ak three -stage static aeration device to a 48" line, which discharges through an effluent
^` channel and into Crowders Creek. The plant has a belt filter press and solids contact
reactor that are currently not being utilized. The process flow schematics show all of the
processes of the treatment plant along with backup power sources. The plant has three
generators with outputs of 500 KW, 750 KW and 1000 KW located throughout the plant.

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Crowders Creek WWTP, NCO074268 Renewal Catawba River Basin
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following Information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: A.B. Carter
Mailing Address: PO Box 518
Gastonia, NC 28053
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Wire cleaniniz, copper coating . Durinp 2014. User used steel that is stamped into parts and lastic/n Ion which is in'ection molded.
Steel wire is drawn to diameter needed by customer. Some is copper coated after being drawn. Some wire coils are pickled. The acid
pickling (HCI) is a 628 gallon tank which is dumped Umonth. Rinse water discharges to pretreatment system throughout each shift.
The alkaline cleaner is a 628 gallon tank which is dumped 1/year. Rinse water discharges to pretreatment system on production days
that acid pickling isn't done.
F.S. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): molded nylon , steel wire
Raw material(s): nylon granules, steel rod
F.6. Flow Rate.
a. Process wastewater Flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
4,800 gpd t continuous or X intermittent)
b. Non -process wastewater Flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent
0 gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ® Yes ❑ No
If subject to categorical pretreatment standards, which category and subcategory?
Metal Finisher 40 CFR 465.14
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g., upsets,
interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Crowders Creek WWTP, NCO074268 Renewal Catawba River Basin
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following Information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Industrial Fabricators
Mailing Address: P.O. Box 12885
Gastonia NC 28053
FA. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Liquid painting and Powder coating Parts undergo 5 stages: sulfuric acid and surfactant clean/rinse/iron ohosohate/rinse/rinse. Parts
are then dried painted. cured Sulfuric acid cleaner tank and phosphate tank are emptied once per 6 months and dischar eg to the
pretreatment system Process rinse tanks continually overflow to pretreatment system during first shift hours If pretreatment system
operator is not present. process rinse tanks recvcle and no process discharge occurs.
F.S. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or comminute to the SIU's
discharge.
Principal product(s): Parts for construction equipment and heavy trucks Facility does fabrication of metal parts laser cutting CNC
machining, forming, and welding in addition to the liquid painting and powder coating.
Raw material(s): Steel. aluminum
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
7,400 god ( continuous or X intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
2,450 gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ® Yes ❑ No
If subject to categorical pretreatment standards, which category and subcategory?
Metal Finisher 40 CFR 433.17
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g., upsets,
interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Crowders Creek WWTP, NCO074268 Renewal Catawba River Basin
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following Information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Lubrizol Advanced Materials Inc.
Mailing Address: 207 Telegraph Drive
Gastonia, NC 28056
FA. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Process and wash down of OCPSF manufacturing.
F.6. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): acrylic latex and compounded latex for textiles, automobile companies, paint bases, household beauty and
hvgiene items.
Raw material(s): vinvlidene chloride. acrylic monomer, surfactants
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
22,200 gpd ( continuous or X intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater now discharged into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
0 gpd continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ® Yes ❑ No
If subject to categorical pretreatment standards, which category and subcategory?
OCPSF 40 CFR 414.85
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g., upsets,
interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.
A discharge of a concentrated foaming agent from the industry in late 2011, caused significant foaming issues in the aeration basin
and digesters at the Crowders W WTP which lasted into early 2012 but did not cause permit limit violations at the W WTP.

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Crowders Creek WWTP, NCO074268 Renewal Catawba River Basin
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following Information for each SIU. If mom than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Powder Coating Services Inc.
Mailing Address: 1260 Shannon Bradlev Road
Gastonia. NC 28052
F.4. Industrial Processes, Describe all the industrial processes that affect or contribute to the SIU's discharge.
Coatines, electrostatic painting: domestic through separate pipe. Process waters discharged are about half from powder coat and half
from ecoat. Powder coat process tanks include alkaline cleaner / rinse / iron phosphate / rinse / rinse and then to painting. Ecoat line
uses zinc phosphate.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal produet(s): painted steel
Raw material(s): steel, aluminum, paint, polyester powder. cleaners
F.B. Flow Rate.
a. Process wastewater Flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
25,000 gpd ( continuous or X intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
1,500 gpd ( continuous or X intermittent) .
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ® Yes ❑ No
If subject to categorical pretreatment standards, which category and subcategory?
Metal Finisher 40 CFR 433.17
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g., upsets,
interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Crowders Creek WWTP, NCO074268 Renewal Catawba River Basin
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following Information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the Information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Valley Proteins Inc. Gastonia Division
Mailing Address: 5533 South York Road
Gastonia, NC 28052
FA. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Discharge from process, wash down- air quality units, boiler blow down and domestic. Animal parts & fluids and restaurant oil &
grease are rendered.
F.S. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Poultry meal feather meal fat and grease sludge
Raw material(s): Meat bones, feathers, blood, used cooking oil
F.6. Flow Rate.
a. Process wastewater Flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
173,000 glad (X continuous or intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
3000 gpd (X continuous or intermittent) -Flow based on 25 gallons per person.
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ❑ Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g., upsets,
interference) at the treatment works in the past three years?
❑ Yes ®No If yes, describe each episode.

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Crowders Creek WI TP, NCO074268 Renewal Catawba River Basin
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following Information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the Information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: City of Bessemer City
Mailing Address: 132 W. Virginia Avenue
Bessemer City, NC 28016
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
The City of Bessemer City discharges orocess and domestic wastewater to Two River Utilities (TRU) Crowders W WTP. Bessemer has
an SIU permit issued by TRU Bessemer operates their own pretreatment program Bessemer has issued an SIU permit to Dole Fresh
Vegetables Inc on pipe 001 Pipe 002 has 2 lU's FMC and Manufacturing Services. Additional industrial users discharge through this
pipe to the Crowders W WTP but they are not permitted.
F.S. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Dole's products are vegetables
Raw material(s): Dole's raw materials are vegetables
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
399,000 gpd (X continuous or intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
550,000 gpd (X continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ❑ Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g., upsets,
interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.
The SIU has not contributed to any violations at the W WTP but cyanide (CN) has been a concern: TRU placed the user on a
Consent Order and Compliance Schedule regarding cyanide Bessemer City also had placed a contributing SIU on a Consent Order
and Compliance Schedule, which ended in 2014.

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Crowders Creek WWfP, NCO074268 Renewal Catawba River Basin
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following Information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: City of Kings Mountain
Mailing Address: PO Box 429
Kings Mountain. NC 28086
FA. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
The City of Kings Mountain discharges consist of I&I and domestic wastewater from one house to Two Rivers Utilities (TRU)
Crowders Creek W WTP. Kings Mountain has an SIU permit issued by TRU. Kings Mountain operates their own pretreatment
roroutim. Additional flow could be discharged during a power outage at a lift station. The outage would cause the wet well's overflow
to be discharged to the lift station then to Crowders Creek W WTP.
F.5. Principal Products) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): N/A
Raw material(s): Domestic wastewater
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
0 gpd ( continuous or intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
32,000 gpd (X continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ❑ Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g., upsets,
interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Crowders Creek WWTP, NCO074268 Renewal Catawba River Basin
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following Information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.6 and
provide the Information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Town of Clover
Mailing Address: P.O. Box 1060
Clover, SC 29710
FA. Industrial Processes. Describe all the Industrial processes that affect or contribute to the SIU's discharge.
The Town of Clover discharges process and domestic wastewater to Two Rivers Utilities (TRU) Crowders Creek W WTP The Town
has an SFU permit issued by TRU. The Town operates their own pretreatment program. The Town has issued SIU permits to
Honeywell and Munzine Various other industrial and commercial wastewater flaws are discharged
F.S. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Honeywell's = synthetic rubber gloves: Munzine's = defoamer. Performance Friction = brake shoes:
Jameson = tool covers and handles: Part Inc = molded plastic iniection: Tuscarora Textiles = washes yam:
SE Huffman = metal cabinets and computer housing: Springfield = uses water iet technology on medical
equipment, turbine blades
Raw material(s): Various
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
20,000 gpd ( continuous or X intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent
650,000 gpd (X continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ❑ Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?
The Town of Clover has 2 categorical users SIU permits have been issued to both users: Honeywell is 40 CFR 428: Munzine is 40
CFR 4I4.
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g., upsets,
interference) at the treatment works in the past three years?
® Yes ❑ No If yes, describe each episode.
The Town of Clover's ammonia and solids discharges can cause issues with processes at the Crowders Creek W WTP The Town is
currently under a Consent Order and Compliance Schedule for Ammonia Nitrogen, Organic Nitrogen. Total Phosphorus and Mercury.

C.
FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Crowders Creek WWTP, NCO074268
Renewal
Catawba River Basin
.. Sludge Management Plan
01% for
Crowders Creek Wastewater Treatment Plant
NPDES Permit # NCO074268
^ The Crowders Creek Wastewater Treatment Plant (WWTP) design for sludge handling consists
,wk of anaerobic sludge digestion followed by land application. This plan describes the processes in
Aftk place for treating and disposing of this material.
^ Anaerobic Digestion:
^ The anaerobic digestion system consists of four anaerobic sludge digesters, each with a volume
of approximately 466,000 gallons, which treat the primary and waste -activated sludge from the
^ WWTP. On average, Two Rivers Utilities sends approximately 24,000 gallons of raw and
.. thickened wasted solids to these digesters each day for treatment. Two of these digesters are
Ak covered and capable of being heated, so both may be used as primary digesters. Currently one of
the digesters is being heated and operated as a primary digester, one digester is used as a
^ secondary digester, and two digester are utilized as holding digesters for sludge storage.
AN Raw sludge from the bottom of two primary clarifiers is pumped to the primary digester where it
is retained for at least 15 days at a temperature greater than 35 'C. Wasting from the secondary
"^ clarifiers is also pumped to the primary digester, however these solids are first thickened in the
^ dissolved air floatation thickener (DAFT) unit. The digested sludge is transferred from the
.. primary digester into the unheated secondary digester, before being transferred and stored in the
holding digesters until transported for land application.
Crowders WWTP final holding digesters each have a capacity of 466,000 gallons. Additionally,
^ Two Rivers Utilities operates a residuals storage facility at Two Rivers Utilities' Resource
Recovery Farm located between Dallas and Chenyville. This facility is capable of storing an
.►
additional eight million gallons of biosolids when application activities are hindered by
inclement weather.
.� The Crowders Creek WWTP currently complies with the 503 pathogen reduction requirement
for Class B biosolids by fecal coliform density demonstration [40 CFR 503.32(b)(2) / 15A
NCAC 02T.1106(c.)(1.)].
�► Vector attraction reduction is demonstrated by a measurement of 38% volatile solids reduction
[40 CFR 503.33 (b)(1) / 15A NCAC 02T.1107(a)(1)] using the Van Kleeck's equation. At least
once per week, the % volatile solids of the raw sludge, DAFT sludge and digested sludge are
analyzed and the %VS reduction is calculated.
..
^
r

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Crowders Creek WWTP, NCO074268
Renewal
Catawba River Basin
Land Application Program:
For beneficial reuse of these biosolids, Two Rivers Utilities utilizes land application for disposal
of these solids. Gastonia contracts with EMA Resources to perform this land application.
Biosolids from Gastonia's wastewater treatment plants are land applied to permitted local
farmland in North Carolina, in accordance with NC DENR Land Application (503) Permit
WQ0001793 and in South Carolina in accordance with SC DHEC Land Application of Domestic
Sludge Permit ND0084883. One hundred seventy-seven of the acres in North Carolina are on
City owned land at the Resource Recovery Farm and the remainder is private farmland.
Aa
rWA
w

Influent
6 mgd
Main Lift /
Screening I
Grit Removal
9 mgd
Crowders Creek WWTP -Process Flow Schematic
Primary
Clarifiers
3 mgd
Add
Caustic
Current Supplemental
Carbon Addition
Alum Addition
1.5 mgd internal recycle I
,p 4.5 mgd
CA
CL
6
3 mgd 3
ca
CL
10
CD
E
IPs�rn,-,�-Ty M
Cd��e RAS
Final Clarifiers
4.5 mgd
. Splitter
► Anaerobic
► Anoxic
Oxic
E
M
RAS '40#AS
Potential Supplemental
Carbon Addition Treatment Trains
6 mgd
3 mgd
4.5 mgd
1.5 mgd internal recycle
Current Supplemental
Carbon Addition
Polishing Ponds
*Plant design allows for multiple step feed
options into aeration basin
Chlorine
Contact
6 mgd 6 mgd
Dechlorination
To Crowders Creek
co
CL

I 18.2 Topographical
Map of Crowders WWTP
'� - r .,n.:13Y[ ( `h
Permit #NC0074268 �,.-� �� V _
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Legend
----- i Facility Boundary =. `�- .. f'*�'� - � p, - - -, �,y- ;�•, �
Parcels
R Ground Water Wells >' t ' `f Crowders Creek WWTP Outfall 001
t y _ Latitude 35 degrees 10' 10" �.
® .25 Mile Buffer i �`'; �` Longitude 81 degrees 11' 48"
Roads
r Nodes
Sewer
Structures-
�) Air Rel Valve in ManholeIk
O Manhole
Abandon Manhole
Proposed Manhole s - --
1 p Abandon SLSIL
O Valve f ;! o
O ° -
(' Monitoring Well
xv
© Meter
b Plug
Inverted Siphon �a
Digesters for treatment and storage of sludge.
C) Chemical Manhole
OTreatment Plant
VF
I e Uncoded Node
e Abandon Uncoded Node W ►OU �NA-
-- _ -
Sewer Lines
Lines' err
I %
I MAIN A.
I FORCE MAIN %-n 56 Y
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N USGS Quandrangle •1'3t� iir� %°t`e€'tl =F
i w E Map Referenced:-
J Gastonia South `
0 0.3 0.6 Miles

Proposed Regional WWTP
Active WWTP
Decommissioned WWTP
Decommissioned WWTP - In -Progress
Decommissioned WWTP - Proposed
i Decommissioned WWTP - Future
Pumping Station
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PS
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ong Cie k
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PS
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Two Rivers Utilities (TRU) I Gastonia Regionalization Area
Proposed Conditions