NC0024970_Draft Permit_20230502

ROY COOPER ix
Governor
ELIZABETH S.BISER
Secretary
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
May 2, 2023
Mr. Joseph Lockler
Operations Chief
Charlotte Water
5100 Brookshire Boulevard
Charlotte,North Carolina 28216
Subject: Draft NPDES Permit Renewal
Permit NC0024970
McAlpine Creek WWMF
Mecklenburg County
Grade IV Biological WPCS
SIC Code 4952
Dear Mr. Lockler:
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please
review this draft carefully to ensure thorough understanding of the requirements and conditions it
contains. There are several changes from the existing permit, including the following:
• Based on the reasonable potential analysis (RPA) showing no reasonable potential to
violate state water quality standards, the monitoring requirements for total silver,
dibromochloromethane and total phenolic compounds have been removed from the permit[See
A.(1)].
• For calculation of total nitrogen and total phosphorous loadings, monitoring requirements
for total monthly flow,TKN and Nitrate+Nitrite have been added to the permit [See A.(1.)].
• Total Phosphorous reporting requirements have been further broken down into total
phosphorous concentration, daily loading, monthly loading, 12-month loading and combined
12-month loading [See A.(1.)].
• Language has been added to Special Condition A.(7.) Combined Limitation for Total
Phosphorous and A.(8.) Calculation and Reporting of Total Phosphorous Loads to further
clarify the requirements.
• Based on review of existing total residual chlorine requirements(TRC),the weekly average
TRC limit has been removed and the daily maximum TRC limit has been revised[See A.(1.)].
• The statement,"There shall be no discharge of floating solids or visible foam in other than
trace amounts,"has been added back into the permit [See A.(1.)].
• Based on instream data review reporting observed levels of fecal coliform downstream of
the Irwin Creek WWTP at heightened concentrations, instream fecal coliform monitoring has
been added to the permit upstream in Irwin Creek and downstream in Sugar Creek [See
Conditions A.(3.)and A.(4.)].
• Based on the 2022 Integrated Report identifying turbidity as exceeding criteria in the
receiving stream,instream turbidity monitoring has been added to the permit upstream in Irwin
Creek and downstream in Sugar Creek [See Conditions A.(3.)and A.(4.)].
• A special condition to monitor effluent PFAS chemicals quarterly has been added to the
permit,to be effective six(6)months after EPA has a final wastewater method in 40 CFR136
North Carolina D ry Stye nt 11611 Mail eService Center I Raleigh,North Cazolina 27699-1611
ocan+Ur���,�,;.r��m.••:,.o.� /'� 919.707.9000

method published in the Federal Register [See Special Condition A.(10.) PFAS Monitoring
Requirements].
• As the facility receives complex waste streams from various industrial users with the
potential to discharge 1,4-dioxane via their pretreatment program and the facility discharges
above the NC/SC state border,monthly monitoring for 1,4-dioxane as well as a 1,4-dioxane
reopener condition have been added to the permit[See A.(1.) and Special Condition A.(11.)].
• Some of the wording has changed in Special Condition A.(6.), Chronic Toxicity Permit
Limit,please review each paragraph carefully.
• Special Condition A.(9.)has been modified to include the specific three years in which the
Effluent Pollutant Scan shall be performed (2025, 2026, and 2027). In addition, at the end of
the Special Condition, 2nd species Toxicity Testing Requirements for municipal permit
renewals per Federal Regulations [40 CFR 122.21(j)(5)] have been added.
• A notation was made concerning the Electronic Reporting Rule — NPDES Electronic
Reporting Rule — Phase 2 Extension. EPA extended the Phase 2 deadline to December 21,
2025.
• Federal regulations require electronic submittal of all discharge monitoring reports
(DMRs)and program reports.The requirement to continue reporting discharge monitoring data
electronically using the NC DWR's Electronic Discharge Monitoring Report(eDMR)internet
application has been added to your NPDES permit [See Special Condition A.(13.)].
The NPDES standard conditions(Parts II,III,and IV)that are a part of the permit are not included
in this draft document (cover, map, and Part I). The conditions are the same as in your current
permit except that agency and division names have been updated.The latest version is available at
https://bit.ly/3k5NFaL and can be viewed online or downloaded as a PDF file.
Concurrent with this notification the Division is publishing a notice in a newspaper having
circulation in the general Mecklenburg County area, soliciting public comments on this draft
permit. Please provide any written comments you may have to the following: NCDEQ/DWR,
NPDES Permitting Branch, 1617 Mail Service Center, Raleigh,NC 27699-1617 no later than 30
days after receipt of this draft permit.
Following the 30-day public comment period,the Division will review all pertinent comments
and take appropriate action prior to issuing a final permit. If you have questions concerning this
draft permit,please call me at(919)707-3609 or by email at [e-mail].
Sincerely, Docu$lgn.a by:
49
Coto
A4FBFCAI4FD...
Nick Coco,PE
NPDES Municipal Permitting Unit
Hardcopy: NPDES Files
Ecopy: US EPA Region 4
DWR/Mooresville Regional Office/Water Quality/Andrew Pitner
DWR/Operator Certification Program/Maureen Kinney
DWR/Aquatic Toxicology Branch/Cindy Moore
DWR/Municipal Permitting Unit/Keyes McGee
SCDHEC/Brenda Green
Qs)-A North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11611 Mail Service Center I Raleigh.North Carolina 27699-1611
jeio 919 707 9000
4yvYw11 M FwMrvMYY1 OWN

Permit NC0024970
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provisions of North Carolina General Statute 143-215.1,other lawful standards and
regulations promulgated and adopted by the North Carolina Environmental Management Commission,and the
Federal Water Pollution Control Act,as amended,
Charlotte Water
is hereby authorized to discharge wastewater from a facility located at the
McAlpine Creek Wastewater Management Facility(WWMF)
12701 Lancaster Highway
Pineville
Mecklenburg County
to receiving waters designated as McAlpine 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 Month xx, 2023.
This permit and authorization to discharge shall expire at midnight on June 30,2028.
Signed this day Month xx,2023.
DRAFT
for Richard E.Rogers,Jr.,Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0024970
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked, and as
of this issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive
authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and
provisions included herein.
Charlotte Water
is hereby authorized to:
1. Continue to operate and maintain McAlpine Creek WWMF,an existing 64.0 MGD facility consisting of the
following components :
• Flow equalization
• Screening /,;„
• Grit removal
• Primary clarifiers
• Aeration basins
• Secondary clarifiers �.
• Biological and chemical phosphorous rem.
• Alkaline addition for nitrification
• Chlorination
• Dechlorination
• Anaerobic sludge digestion
• Centrifuges and gravity sludge thickeners
• Rapid sand filters
2. Discharge from said treatment works at the location specified on the attached map via Outfall 001 into
McAlpine Creek currently classified C waters in the Catawba River Basin and 03050103 HUC.
Page 2of16

Permit NC0024970
PART I
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [64.0 MGD]
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade IV
Biological Water Pollution Control System [15A NCAC 08G .0302]
(a.) During the period beginning on the effective date of the permit and lasting until permit expiration,the
permittee is authorized to discharge treated municipal and industrial wastewater from Outfall 001. Such
discharges shall be limited and monitored by the permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location
Flow 50050 64.0 MGD Continuous Recording Influent or
Effluent
Total Monthly Flow(MG) 82220 Monitor and Report Monthly Recorded or Influent or
Calculated Effluent
CBOD,5-day(20°C)2 80082 4.0 mg/L 6.0 mg/L 2/Week 3 Composite Influent and
(April 1 -October 31) Effluent
CBOD, 5-day(20°C)2 80082 8.0 mg/L 12.0 mg/L 2/Week 3 Composite Influent and
(November 1-March 31) Effluent
Total Suspended Solids 2 C0530 15.0 mg/L 22.5 mg/L 2/Week 3 Composite Influent and
Effluent
NH3 as N (April 1 -Oct 31) C0610 1.0 mg/L 3.0 mg/L 2/Week 3 Composite Effluent
NH3 as N (Nov 1-Mar 31) C0610 1.9 mg/L 5.7 mg/L 2/Week 3 Composite Effluent
Fecal Coliform 31616 200/100 mL 400/100 mL 1000/100 mL 2/Week 3 Grab Effluent
(geometric mean)
pH 00400 Between 6.0 and 9.0 standard units Daily Grab Effluent
Dissolved Oxygen 00300 Daily Average > 6.0 mg/L Daily Grab Effluent
Conductivity(pmhos/cm) 00094 Monitor and Report Daily Grab Effluent
Temperature(°C) 00010 Monitor and Report Daily Grab Effluent
Total Residual Chlorine 4 50060 17 pg/L Daily Grab Effluent
Total Nitrogen C0600 Monitor and Report Monthly Calculated Effluent
(NO2+NO3+TKN) (mg/L)
TKN (mg/L) 00625 Monitor and Report Monthly Composite Effluent
NO3-N + NO2-N (mg/L) 00630 Monitor and Report Monthly Composite Effluent
Total Phosphorus(mg/L) C0665 Monitor and Report Monthly Composite Effluent
Daily TP Load 5-' QD665 1,067 lb/day Monthly Calculated Effluent
Monthly TP Load(Ib/mo)5-' QM665 Monitor and Report Monthly Calculated Effluent
12-Month TP Load(Ib/yr)5,7 QY665 Monitor and Report Monthly Calculated Effluent
Combined 12-Month TP RA665 See Conditions A.(7)and A.(8) Monthly Calculated Effluent
Load(Ib/day)6'7
Chronic Toxicity 5 TGP3B Monitor and Report Quarterly Composite Effluent
Hardness-Total as CaCO3 00900 Monitor and Report Quarterly Composite Effluent
(mg/L)
PFAS variable Footnote 9 Footnote 9 Grab Effluent
1,4-Dioxane10 82388 Monitor and Report Monthly'° Grab Effluent
Effluent Pollutant Scan NC01 Monitor and Report Footnote 11 Footnote 11 Effluent
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system.
See Special Condition A.(13.).
Footnotes continue on the next page.
Page 3 of 16

Permit NC0024970
2. The monthly average effluent CBODS and Total Suspended Solids concentrations shall not exceed 15%of the respective
influent value(85%removal).
3. Twice per week sampling must occur on any two non-consecutive days during the calendar week.
4. The facility shall monitor TRC when using chlorination for disinfection.The Division shall consider all effluent total
residual chlorine values reported below 50 µg/1 to be in compliance with the permit. However,the permittee shall
continue to record and submit all values reported by a North Carolina certified laboratory(including field certified),even
if these values fall below 50 µg/l.
5. The requirements for Monthly TP Load(lb/mo,QM665),Daily TP Load(lb/day,QD665),and 12-Month TP Load
(Ib/yr,QY665)apply to discharges from this McAlpine Creek WWMF.These parameters are defined in Condition A.(8)
of this permit.
6. The Permittee is also subject to a Combined TP Load limit(lb/day,RA665)on the combined discharges from the
McAlpine Creek,Sugar Creek,and Irwin Creek facilities in accordance with Conditions A.(7.)and A.(8.).
7. All TP Load values shall be calculated and reported as specified in this Condition and Conditions A.(7.)and A.(8.).
8. Chronic Toxicity(Ceriodaphnia dubia)P/F at 90%with testing in March,June, September,and December.See Special
Condition A.(6.).
9. See Special Condition A.(10.).
10. Samples will be analyzed and reported using sufficiently sensitive test procedures(i.e.,methods)approved under 40
CFR part 136 for the analysis of pollutants or pollutant parameters.After a 24-month sampling period,the Permittee may
request the Division conduct a review of submitted data for assessment and approval of a 1,4-dioxane monitoring
frequency reduction from monthly to quarterly.
11. The permittee shall perform three effluent pollution scans during the term of this permit.See Special Condition A.(9.).
(b.)There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 16

Permit NC0024970
A.(2.) MCALPINE CREEK INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B.0500 et seq.]
(a.) During the period beginning on the effective date of the permit and lasting until expiration,the Permittee
shall monitor McAlpine Creek as specified below:
MONITORING REQUIREMENTS
PARAMETER
Parameter Code Measurement Sam Type
Frequency pSample Location 2
le
Dissolved Oxygen (mg/L) 00300 Variables Grab MC1 and MC2
Temperature(°C) 00010 Variables Grab MC1 and MC2
Conductivity(pmhos/cm) 00094 Variable' Grab MC1 and MC2
Total Copper(pg/L) 01042 Quarterly Grab MC1 and MC2
Hardness Total as[CaCO3 00900 Quarterly Grab MC1
or(Ca+ Mg)] (mg/L)
Footnotes:
1. Variable=Weekly(June 1 —September 30)and monthly(October 1 —May 31)
2. Instream sampling locations:MC1 =McAlpine Creek,upstream of McAlpine Creek WWTP,and MC2=McAlpine
Creek,downstream of confluence with McMullen Creek at SC 2964.
(b.) It is recommended that instream monitoring for sampling locations IC1, SCI, SC2, SC3, SC4, SC5,LSC1,
LSC3,MC1 and MC2 be conducted during the same day or on consecutive days.
Page 5 of 16

Permit NC0024970
A.(3.) IRWIN CREEK INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B.0500 et seq.]
(a.) During the period beginning on the effective date of the permit and lasting until expiration,the Permittee
shall monitor Irwin Creek as specified below:
MONITORING REQUIREMENTS
PARAMETER
Parameter Code Measurement Sample Type2
Frequency p Sample Location
Dissolved Oxygen (mg/L) 00300 Variable' Grab IC1
Temperature(°C) 00010 Variable' Grab IC1
Conductivity(pmhos/cm) 00094 Variable' Grab IC1
Fecal Coliform(#/100mL) 31616 Variable' Grab IC1
•
Turbidity(NTUs) 00070 Variable' Grab IC1
Total Copper(pg/L) 01042 Quarterly Grab IC1
Total Chromium(pg/L) 01034 Quarterly Grab IC1
Hardness-Total as[CaCO3 00900 Quarterly Grab IC1
or(Ca + Mg)] (mg/L)
Footnotes:
1. Variable=Weekly(June 1 —September 30)and monthly(October 1 —May 31)
2. Instream sampling locations: IC1=Irwin Creek,upstream of Irwin Creek WWTP
(b.) It is recommended that instream monitoring for sampling locations ICI, SC1, SC2, SC3, SC4, SC5, LSC1,
LSC3,MC 1 and MC2 be conducted during the same day or on consecutive days.
(c.) McAlpine Creek WWMF's permit contains all instream monitoring requirements for Irwin Creek
WWTP's (NC0024937) receiving stream, Irwin Creek. Submit all monitoring requirements for Irwin
Creek on McAlpine Creek WWMF's electronic discharge monitoring reports.
Page 6 of 16

Permit NC0024970
A.(4.) SUGAR CREEK INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B.0500 et seq.]
(a.) During the period beginning on the effective date of the permit and lasting until expiration,the Permittee
shall monitor Sugar Creek as specified below:
MONITORING REQUIREMENTS
PARAMETER
Parameter Code Measurement Tle Sample PType Sample Location 2
Dissolved Oxygen(mg/L) 00300 Variable' Grab SC1,SC2, SC3,SC4,and SC5
Temperature(°C) 00010 Variable' Grab SC1,SC2,SO,SC4,and SC5
Conductivity(umhos/cm) 00094 Variable' Grab SC1,SC2,SC3,SC4,and SC5
Fecal Coliform(#/100mL) 31616 Variable' Grab SC1
Turbidity(NTUs) 00070 Variable' Grab SC1
Total Chromium(ug/L) 01034 Quarterly Grab SC4
Total Copper(pg/L) 01042 Quarterly Grab SC4
pH(standard units) 00400 Variable' Grab SC5
NH3 as N (mg/L) C0610 Weekly Grab SC5
Nitrate/Nitrite(NOX) 00630 Weekly Grab SC5
(mg/L)
Total Kjeldahl Nitrogen 00625 Weekly Grab SC5
(TKN)(mg/L)
Total Phosphorus(mg/L) C0665 Weekly Grab SC5
Orthophosphate(mg/L) 70507 Weekly Grab SC5
Footnotes:
1. Variable=Weekly(June 1 —September 30)and monthly(October 1 —May 31)
2. Instream sampling locations:SC 1 =Sugar Creek,downstream of confluence with Irwin Creek at Yorkmont Road,SC2=
Sugar Creek,downstream of confluence with Irwin Creek at Arrowhead Road,SC3=Sugar Creek,downstream of
confluence with Irwin Creek at Nations Ford Road,SC4=Sugar Creek,downstream of confluence with Irwin Creek at
Route 51,SC5=Sugar Creek,downstream of confluence with McAlpine Creek at Route 160.
(b.) It is recommended that instream monitoring for stations ICI, SC1, SC2, SC3, SC4, SC5,LSC1, LSC3,
MC 1 and MC2 be conducted during the same day or on consecutive days.
(c.) McAlpine Creek WWMF's permit contains all instream monitoring requirements for Irwin Creek
WWTP's (NC0024937)receiving stream, Sugar Creek. Submit all monitoring requirements for Sugar
Creek on McAlpine Creek WWMF's electronic discharge monitoring reports.
Page 7 of 16

Permit NC0024970
A.(5.) LITTLE SUGAR CREEK INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B.0500 et seq.]
(a.) During the period beginning on the effective date of the permit and lasting until expiration,the Permittee
shall monitor Little Sugar Creek as specified below:
MONITORING REQUIREMENTS
PARAMETER
Parameter Code Measurement Tle Sample p ype Sample Location 2
Dissolved Oxygen(mg/L) 00300 Variables Grab LSC1 and LSC3
Temperature(°C) 00010 Variables Grab LSC1 and LSC3
Conductivity(pmhos/cm) 00094 Variables Grab LSC1 and LSC3
Total Copper(pg/L) 01042 Quarterly Grab LSC1 and LSC3
Hardness-Total as
[CaCO3 or(Ca+ Mg)] 00900 Quarterly Grab LSC1
(mg/L)
Footnotes:
1. Variable=Weekly(June 1—September 30)and monthly(October 1—May 31)
2. Instream sampling locations:LSCI=Little Sugar Creek,upstream of Sugar Creek WWTP and LSC3=Little Sugar
Creek,downstream of Sugar Creek WWTP at Highway 51.
(b.) It is recommended that instream monitoring for stations IC1, SC I, SC2, SC3, SC4, LSC1, LSC3,
MCI and MC2 be conducted during the same day or on consecutive days.
(c.) McAlpine Creek WWMF's permit contains all instream monitoring requirements for Sugar Creek
WWTP's(NC0024937)receiving stream, Little Sugar Creek. Submit all monitoring requirements for
Little Sugar Creek on McAlpine Creek WWMF's electronic discharge monitoring reports.
(d.) The revised instream monitoring program,no longer requires monitoring of sampling location LSC2. The
LSC2 designation continues to refer to the sampling station on Little Sugar Creek downstream of the Sugar
Creek WWTP at Archdale Road; however,this station is inactive.
Page 8 of 16

Permit NC0024970
A.(6.) CHRONIC TOXICITY PERMIT LIMIT(QUARTERLY)
[15A NCAC 02B .0200] [15A NCAC 02B .0500 et sect]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 90%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the"North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,"(Revised December 2010,or subsequent versions)
or"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"(Revised December 2010,or
subsequent versions). The tests will be performed during the months of 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 electronically using the
Division's eDMR system for the months in which tests were performed,using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value.Additionally, DWR Form AT-3(original)is to be sent to the
following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Or,results can be sent to the email,[e-mail].
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after
the end of the reporting period for which the report is made.
Test data shall be complete,accurate, include all supporting chemical/physical measurements and all
concentration/response data,and be certified by laboratory supervisor and ORC or approved designate signature.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required,
the permittee will complete the information located at the top of the aquatic toxicity(AT)test form indicating the
facility name,permit number,pipe number, county,and the month/year of the report with the notation of"No
Flow"in the comment area of the form. The report shall be submitted to the Water Sciences Section at the address
cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required,monitoring will be
required during the following month.Assessment of toxicity compliance is based on the toxicity testing quarter,
which is the three-month time interval that begins on the first day of the month in which toxicity testing is
required by this permit and continues until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water
Resources indicate potential impacts to the receiving stream,this permit may be re-opened and modified to
include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival,minimum control organism reproduction,and appropriate environmental controls,shall constitute an
invalid test and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.
Page 9 of 16

Permit NC0024970
A.(7.) COMBINED LIMITATION FOR TOTAL PHOSPHORUS—OUTFALL TPO1
[NCGS 143-215.1 (b)]
(a.) As stipulated by the 2002 Settlement Agreement between Charlotte-Mecklenburg Utilities(now Charlotte
Water),the South Carolina Department of Health and Environmental Control(SC DHEC),and the North
Carolina Division of Water Quality(now the Division of Water Resources,NC DWR),Charlotte Water's
McAlpine Creek WWMF, Sugar Creek WWTP and Irwin Creek WWTP must comply with a combined
limit for Total Phosphorus.
(b.) Accordingly,during the period beginning on the effective date of this permit and lasting until expiration,
the Permittee continues to be authorized to discharge Total Phosphorus from the McAlpine Creek WWMF
(NC0024970,Outfall 001),the Sugar Creek WWTP(NC0024937,Outfalls 001 and 002),and the Irwin
Creek WWTP(NC0024945,Outfall 001)subject to a Combined TP Load limitation of 826.0 lb/day,
calculated as a rolling 12-month average daily load.
(c.) Monitoring requirements for Total Phosphorus shall be as specified in the Effluent Limitations and
Monitoring Requirements in each of the specified permits; see Condition A.(1.)in this permit.
(d.) TP Loads shall be calculated and reported as specified in the Calculation and Reporting of Total
Phosphorus Loads condition in the facilities' individual NPDES permits. See Condition A.(8),below. The
Combined TP Load(Outfall TPO1)shall be reported on the DMRs for the McAlpine Creek WWMF.
A.(8.) CALCULATION AND REPORTING OF TOTAL PHOSPHORUS LOADS
[NCGS 143-215.1 (b)]
(a.)The Permittee shall calculate the TP Loads for the McAlpine Creek WWMF as follows and report the results
in the facility's discharge monitoring report(DMR)for Outfall 001:
(i.) Monthly TP Load(lb/mo,QM665) = TP x TMF x 8.34
where:
TP = the average of total phosphorus concentrations(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.) Daily TP Load(lb/day, QD665) = Monthly TP Load_Number of Days in the current month
(iii.) .nth TP Load(lb/yr, QY665) = Sum of the Monthly TP Loads for the 12-month
period ending with the reporting month
(b.)The Permittee sha .,a culate the rolling 12-month average daily TP load(or Combined TP Load)for the
McAlpine Creek WWMF(Outfall 001), Sugar Creek WWTP(Outfalls 001 and 002),and Irwin Creek
WWTP(Outfall 001)as follows and report the results on the DMRs for the McAlpine Creek facility for
Outfall TPO1:
Combined TP Load(lb/day,RA665) = Sum of 12-Month TP Loads for the three
facilities_Number of Days in the 12-month period
Page 10 of 16

Permit NC0024970
A.(9.) ADDITIONAL MONITORING REQUIREMENTS FOR PERMIT RENEWAL
[G.S. 143-215.1(B)]
(a.) Effluent Pollutant Scans. 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: 2025,2026,and
2027. 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.
Each annual sample shall coincide with one quarterly toxicity test each year(see Condition A.(6.)
(CHRONIC TOXICITY PERMIT LIMIT(QUARTERLY))),and each must be collected in a different
calendar quarter to 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) C0610 Trans-1,2-dichloroethylene 34546 Bis(2-chloroethyl)ether 34273
Chlorine(total residual,TRC) 50060 1,1-dichloroethylene 34501 Bis(2-chloroisopropyl)ether 34283
Dissolved oxygen 00300 1,2-dichloropropane CO541 Bis(2-ethylhexyl)phthalate C0100
Nitrate/Nitrite 00630 1,3-dichloropropylene 77163 4-bromophenyl phenyl ether 34636
Kjeldahl nitrogen 00625 Ethylbenzene 34371 Butyl benzyl phthalate 34292
Oil and grease 00556 Methyl bromide 34413 2-chloronaphthalene 34581
Phosphorus C0665 Methyl chloride 34418 4-chlorophenyl phenyl ether 34641
Total dissolved solids 70295 Methylene chloride 34423 Chrysene 34320
Hardness 00900 1,1,2,2-tetrachloroethane 81549 Di-n-butyl phthalate 39110
Antimony 01097 Tetrachloroethylene 34475 Di-n-octyl phthalate 34596
Arsenic 01002 Toluene 34010 Dibenzo(a,h)anthracene 34556
Beryllium 01012 1,1,1-trichloroethane 34506 1,2-dichlorobenzene 34536
Cadmium 01027 1,1,2-trichloroethane 34511 1,3-dichlorobenzene 34566
Chromium C0034 Trichloroethylene 39180 1,4-dichlorobenzene 34571
Copper 01042 Vinyl chloride 39175 3,3-dichlorobenzidine 34631
Lead 01051 Acid-extractable compounds: Diethyl phthalate 34336
1 Mercury(Method 1631E) COMER P-chloro-m-cresol 34452 Dimethyl phthalate 34341
Nickel 01067 2-chlorophenol 34586 2,4-dinitrotoluene 34611
Selenium 01147 2,4-dichlorophenol 34601 2,6-dinitrotoluene C0626
Silver 01077 2,4-dimethylphenol 34606 1,2-diphenylhydrazine 34346
Thallium 01059 4,6-dinitro-o-cresol 34657 Fluoranthene C0376
Zinc 01092 2,4-dinitrophenol 34616 Fluorene 34381
Cyanide 00720 2-nitrophenol 34591 Hexachlorobenzene C0700
Total phenolic compounds 32730 4-nitrophenol 34646 Hexachlorobutadiene C0702
Volatile organic ' ,ounds: Pentachlorophenol 39032 Hexachlorocyclo-pentadiene 34386
Acrolein 34210 Phenol 34694 Hexachloroethane 34396
Acrylonitrile 34215 2,4,6-trichlorophenol 34621 Indeno(1,2,3-cd)pyrene 34403
Benzene 34030 Base-neutral compounds: Isophorone 34408
Bromoform 32104 Acenaphthene 34205 Naphthalene 34696
Carbon tetrachloride 32102 Acenaphthylene 34200 Nitrobenzene 34447
Chlorobenzene 34301 Anthracene CO220 N-nitrosodi-n-propylamine 34428
Chlorodibromomethane 34306 Benzidine 39120 N-nitrosodimethylamine 34438
Chloroethane 85811 Benzo(a)anthracene C0526 N-nitrosodiphenylamine 34433
2-chloroethyl vinyl ether 34576 Benzo(a)pyrene 34247 Phenanthrene 34461
Chloroform 32106 3,4 benzofluoranthene 34230 Pyrene 34469
Dichlorobromomethane 32101 Benzo(ghi)perylene 34521 1,2,4-trichlorobenzene C0551
1,1-dichloroethane 34496 Benzo(k)fluoranthene 34242
1,2-dichloroethane 32103 Bis(2-chloroethoxy)methane 34278
(b.) Effluent Scan Reporting. Test results shall be reported electronically via eDMR by December 31 st of
each designated sampling year,except that,subject to prior written approval by the Director,results can be
reported on DWR Form DMR-PPA-1 or other form approved by the Director. The permittee must at least
report completion of the test in the eDMR system by entering"1"or"Y"for parameter code NC01 -
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Permit NC0024970
Annual Pollutant Scan. If written reports are approved,the report shall be submitted to the following
address:
North Carolina Division of Water Resources
Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
Or the form may be uploaded at: https://edocs.deq.nc.gov/Forms/NPDES_WW-EDMR-Supplemental-Form
(c.) 2°d-Species Toxicity Testing and Reporting.
(i.) In addition to the quarterly toxicity tests required in Condition A.(6.) (CHRONIC TOXICITY
PERMIT LIMIT(QUARTERLY)),the Permittee shall perform and report the results of four(4)
toxicity tests using the same test methods using a second species of test organism suitable to the tests
being conducted.
(ii.) The 2nd species toxicity tests shall be conducted either:
(A) Once per quarter in a single 12-month pe tod(four samples);if this option is chosen,the
sample for each 2nd species test shall c< < _4 e with the quarterly samples collected for
(CHRONIC TOXICITY PERMIT LIMIT(• ARTERLI));or
(B) Once per 12-month period in the four-and one-half year period prior to the scheduled
application for permit renewal(four samples);if this option is chosen,three of the samples for
the 2nd species test shall coincide with those for the annual effluent scans and the coincident
quarterly toxicity test,and each of the four annual samples shall be collected in a different
calendar quarter in order to represent seasonal variation.
(iii.) The results of the toxicity tests shall be submitted to the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
Or,results can be sent to the email,[e-mail].
(iv.) ,ults of the 2nd species tests shall also be summarized in Part E(Toxicity Testing Data)of EPA
ipal Application Form 2A when submitting the permit renewal application to the NPDES
W. ter Program.
The Permittee may contact the Division's Aquatic Toxicology Branch at 919-743-8401 for guidance
on conducting the additional toxicity tests and reporting of the results.
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Permit NC0024970
A.(10.) PFAS MONITORING REQUIREMENT
[G.S. 143-215.1(b.)]
This reporting requirement for the per- and polyfluoroalkyl substances(PFAS)parameters listed under Table 1 of
the Final Method 1633 takes effect the first full calendar quarter following six(6)months after EPA publishes a 40
CFR part 136 Final PFAS Method for wastewater in the Federal Register. Monitoring will be at a quarterly
frequency.
Find the current parameters listed under Table 1 of the 3`d Draft Method 1633 Analysis of Per-and Polyfluoroalkyl
Substances(PFAS)in Aqueous, Solid,Biosolids,and Tissue Samples by LC-MS/MS at:
https://www.epa.gov/system/files/documents/2022-
12/3rd%20Draft%20Method%201633%20December%202022%2012-20-22 508.pdf
A.(11.) 1,4-DIOXANE RE-OPENER
[NCGS 143-215.1 (b)]
Pursuant to N.C.General Statutes Section 143-215.1 and the implementing rules found in the North Carolina
Administrative Code at 15A NCAC 2H.0112(b)(1)and 2H.0114(a)and Part II,Sections B-12 and B-13 of this
permit,the Director of DWR may reopen this permit to modify permit requirements to address 1,4-Dioxane
monitoring,treatment and/or compliance.
A.(12.) MERCURY MINIMIZATION PLAN(MMP)
[N.C.G.S. 143-215.1 (B)]
The Permittee shall maintain and continue to implement the Mercury Minimization Plan(MMP)developed in the
previous permit term. The MMP shall continue to be available for inspection on-site.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 MMP 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.
A.(13.) ELECTRONIC REPORTING -DISCHARGE MONITORING REPORTS
[G.S. 143-215.1 (b)]
Federal regulations require electronic submittal of all discharge monitoring reports(DMRs)and program reports.
The final NPDES Electronic Reporting Rule was adopted and became effective on December 21,2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this permit
(Standard Conditions for NPDES Permits):
• Section B.(11.) Signatory Requirements
• Section D.(2.) Reporting
• Section D.(6.) Records Retention
• Section E.(5.) Monitoring Reports
1. Reporting Requirements [Supersedes Section D.(2.)and Section E.(5.)(a)1
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eDMR)interne application.
Monitoring results obtained during the previous month(s)shall be summarized for each month and submitted
monthly electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring data
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Permit NC0024970
and submit DMRs electronically using the internet. The eDMR system may be accessed at:
https://deq.nc.gov/about/divisions/water-resources/edmr.
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility being
physically located in an area where less than 10 percent of the households have broadband access,then a
temporary waiver from the NPDES electronic reporting requirements may be granted and discharge
monitoring data may be submitted on paper DMR forms(MR 1, 1.1,2,3)or alternative forms approved by
the Director. Duplicate signed copies shall be submitted to the following address:
NC DEQ/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
See"How to Request a Waiver from Electronic Reporting"section below.
Monitoring results obtained during the previous month(s)shall be summarized for each month and reported
via the eDMR system no later than the last calendar day of the month following the completed reporting
period. Regardless of the submission method,the first DMR is due on the last day of the month following the
issuance of the permit or in the case of a new facility,on the last day of the month following the
commencement of discharge.
Starting on December 21,2025,the permittee must electronically report the following compliance
monitoring data and reports,when applicable:
• Sewer Overflow/Bypass Event Reports; and
• Pretreatment Program Annual Reports;and
• Clean Water Act(CWA)Section 316(b)Annual Reports.
The permittee may seek an electronic reporting waiver from the Division(see"How to Request a Waiver
from Electronic Reporting"section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9),the permittee must identify the initial recipient at the time of each
electronic submission. The permittee should use the EPA's website resources to identify the initial recipient
for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity(EPA or
the state authorized by EPA to implement the NPDES program)that is the designated entity for receiving
electronic NPDES data[see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each type of
electronic submission and for each state. Instructions on how to access and use the appropriate electronic
reporting tool will be available as well. Information on EPA's NPDES Electronic Reporting Rule is found at:
https://www.federalregister.gov/documents/2015/10/22/2015-24954/national-pollutant-discharge-elimination-
system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the"Reporting Requirements"section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an electronic
reporting waiver,a permittee must first submit an electronic reporting waiver request to the Division.
Requests for temporary electronic reporting waivers must be submitted in writing to the Division for written
approval at least sixty(60)days prior to the date the facility would be required under this permit to begin
submitting monitoring data and reports. The duration of a temporary waiver shall not exceed 5 years and
shall thereupon expire. At such time,monitoring data and reports shall be submitted electronically to the
Division unless the permittee re-applies for and is granted a new temporary electronic reporting waiver by the
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Permit NC0024970
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. Sianatory Requirements [Supplements Section B.(11.1(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 II,Section B.(11.)(b). A
person,and not a position,must be delegated signatory authority for eDMR reporting purposes.
For eDMR submissions,the person signing and submitting the D F t obtain an eDMR user account and
login credentials to access the eDMR system. For more inform t' North Carolina's eDMR system,
registering for eDMR and obtaining an eDMR user account, it the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR Using the state's'eDMR system shall make the
following certification[40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of
my knowledge and belief true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, ' uding the possibility of fines and imprisonment for knowing violations."
5. Records Retention !Supplements Section D.(6.)1
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions. These
records or copies shall be maintained for a period of at least 3 years from the date of the report. This period
may be extended by request of the Director at any time [40 CFR 122.41].
Page 15 of 16

Permit NC0024970
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Subbaskr 03-08-34 HUC: 03050103 USGS Quad-G15SE Charlotte Water
Page 16 of 16