NC0089630_Renewal (Application)_20240603

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
William Deal
Charlotte Water
5100 Brookshire Blvd
Charlotte, NC 28216-3371
Subject: Permit Renewal
Application No. NCO089630
Joe C Stowe, Jr., Regional WRRF
Mecklenburg County
Dear Applicant:
NORTH CAROLINA
Environmental Quality
June 03, 2024
The Water Quality Permitting Section acknowledges the June 3, 2024 receipt of your permit renewal application and
supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW permitting
branch. Per G.S. 15OB-3 your current permit does not expire until permit decision on the application is made.
Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit. The
permit writer will contact you if additional information is required to complete your permit renewal. Please respond in a
timely manner to requests for additional information necessary to allow a complete review of the application and renewal
of the permit.
Information regarding the status of your renewal application can be found online using the Department of Environmental
Quality's Environmental Application Tracker at:
https://www.deg.nc.gov/permits-rules/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
ec: WQPS Laserfiche File w/application
Sincerely,
nr' ".,--
Cynthia Demery
Administrative Assistant
Water Quality Permitting Section
North Carolina Department of Environmental Quality I Division of Water Resources
Mooresville Regional Office b10 East Center Avenue. Suite 301 1 Mooresville, North Carolina 28115
704.663.1699

CHARLOTTE
Wt)TER
May 28, 2024
ATTN: Mr. Michael Montebello
Division of Water Resources
Branch Chief
Water Quality Permitting Section - NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
RECEIVED
JUN 0 3 ' R4
I, DF-Q'®\JVRI' `r° ®ES
Re: NPDES Permit Renewal Application
Joe C. Stowe, Jr. Regional Water Resources Recovery Facility (Stowe RWRRF)
NPDES Permit #NC0089630
Mr. Montebello:
Please find the enclosed NPDES permit renewal application for Joe C. Stowe, Jr. Regional Water
Resources Recovery Facility (Stowe RWRRF). The application includes attachments #1-4. The following
is a summary of the attachments submitted with the application:
1. Attachment #1—Stowe RWRRF Topographic Map (Section 2.3).
2. Attachment #2 —Stowe RWRRF Treatment Schematic (Section 2.4).
3. Attachment #3 —Stowe RWRRF Narrative (Section 2.5).
4. Attachment #4 — DWR's Response to Catawba River DO Modeling Report
Please consider the following regarding Charlotte Water's renewal application for Stowe RWRRF:
1. Charlotte Water is requesting to retain our existing Phase I and Phase II flow limits (15.0
and 25.0 MGD) and their associated effluent limitations in our renewed permit.
2. Charlotte Water is requesting the dissolved oxygen limit for Phase II (25.0 MGD) be
modified from 7 mg/L to 6 mg/L based on the Catawba River DO Modeling Study Report
submitted to the Division of Water Resources Modeling and Assessment Branch on
December 8, 2023 (See Attachment #4 — DWR's Response to Catawba River DO).
Charlotte Water 5100 Brookshire Blvd, Charlotte, NC 28216 charlottewater.org
Operated by the City of Charlotte

Please let us know if you have any questions or if you need any further information. You may contact
Shannon Sypolt, Water Quality Program Administrator, at 704/634-6984. You may also contact me at
704/634-3665. Thank you for your assistance with the renewal process.
Respectfuyy,
Joseph LJkler
Operations Chief, Environmental Management Division
Charlotte Water
Cc: Doug Shoutd (ORC, Stowe RWRRF, CLTWater)
Darrell Dewitt (Operations Manager, CLTWater)
Shannon Sypolt (Water Quality Program Administrator, CLTWater)
Charlotte Water 5100 Brookshire Blvd, Charlotte, NC 28216 charlottewater.org
Operated by the City of Charlotte

EPA Identificabw NuTber
NPDES Perrrit N rrber
Facility Narre
Form App aved 03/05/19
110070666903
N00089630
.be C $owe, J'. fbgional WF4F
ONB No. 2040-00D4
Form
U.S. Environmental Protection Agency
2A
:yEPA
Application for NPDES Permit to Discharge Wastewater
NPDES
NEW AND EXISTING PUBLICLY OWNED TREATMENT WORKS
SECTION•N
INFORMATION FOR r
1.1
Facility nameNEU
Rc:CEI
.be C 3owe, Jr. Regional Water Resources Recovery Facility
F5100
Nailing address (street or P.O. box)
Brookshire BLVD. J U N 0 3 2024
City or tam
State
ZIP code
o
Charlotte
NC
6
EContact
nacre (first and last)
Title
Phone number
0
bseph Lockler
Operation Chief
[phone]
bseph.Lockler@charlottenc.g
c
Location address (street, route number, or other specific identifier) ❑ Sarre as mailing address
m
LL
1450 Belmeade Dr.
City or tam
State
ZIP code
'
Charlotte
NC
28214
1.2
Is this application for a facility that has yet to corrrrenoe discharge?
Yes 4 See instructions on data submission ❑ No
requirements for new dischargers.
1.3
Is applicant different from entity listed under Item 1.1 above?
Yes ❑ No -+ Sl4 P to Item 1.4.
Applicant name
Charlotte Water
Applicant address (street or P.O. box)
5100 Brookshire BLVD.
E
`o
City or town
State
ZJ P code
Charlotte
NC
28216
C
Contact name (first and last)
Title
Phone number
Email address
Q
bseph Lodder
Operation Chief
[phone]
bseph.Lockler@charlottenc.9
a
1.4
Is the applicant the facility's owner, operator, or both? (Check only one response.)
❑ Omer ❑ Operator ❑ Both
1.5
To which entity should the NPDES pemitting authority send correspondence? (Check only one response.)
El Facility ❑ Applicant ❑ Facility and applicant
(they are one and the same)
1.6
Indicate below any existing environmental permits. (Check all that apply and print or type the corresponding permit
E
number for each.
Existing Environmental Permits
Ej NPDES (discharges to surface
❑ RCRA (hazardous waste)
❑ UIC (underground injection
water)
control)
E
NOD089630
N/A
N/A
2
❑ PSD (air emissions)
❑ Nonattainm ent program (CAA)
❑ NESFIAPs (CAA)
LU
N/A
N/A
N/A
❑ Cceandumping(NPRSA)
❑ Dredgeor fill (COASection
❑ Other (specify)
404)
w
N/A
WA
N/A
:J
EPA Form 3510-2A (Revised 3-19) Page 1

EPA Identification Number
EPA Identification -��7
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NCO089630
Joe C. Stowe, Jr. Regional WRRF
OMB No. 2040-0004
1.7
Provide the collections stem information
requested below for the treatment works.
Municipality
Population
Collection System Type
Status
Served
Served
indicatepercentage)Ownership
100 % separate sanitary sewer
I] Own 0 Maintain
Charlotte
% combined storm and sanitary sewer
❑ Own ❑ Maintain
2-1
a)
❑ Unknown
❑ Own ❑ Maintain
a
100 % separate sanitary sewer
❑ Own ❑ Maintain
Mount Holly
% combined storm and sanitary sewer
❑ Own ❑ Maintain
❑ Unknown
❑ Own ❑ Maintain
a%
separate sanitary sewer
❑ Own ❑ Maintain
% combined storm and sanitary sewer
❑ Own ❑ Maintain
E
❑ Unknown
❑ Own ElMaintain
a;
% separate sanitary sewer
❑ Own ❑ Maintain
>
% combined storm and sanitary sewer
❑ Own ❑ Maintain
c
❑ Unknown
❑ Own ❑ Maintain
Total
Population y6,51a
�
Served
Separate Sanitary Sewer System
Combined Storm and
Sanitary Sewer
Total percentage of each type of
°
/°
°
/°
sewer line in miles
100
z'
1.8
Is the treatment works located in Indian Country?
'o
U
❑ Yes ✓❑ No
1.9
Does the facility discharge to a receiving water that flows through Indian Country?
❑ Yes ❑✓ No
1.10
Provide design and actual flow rates in the designated spaces.
Design Flow Rate_
15/25 mgd
r y
Annual Average Flow Rates Actual
ca
Two Years Ago
Last Year
This Year
ca
o
N/A mgd
N/A mgd
N/A mgd
Maximum Daily Flow Rates Actual
o
Two Years Ago
Last Year
This Year
N/A mgd
N/A mgd
N/A mgd
y
1.11
Provide the total number of effluent discharge points to waters of the United States by type.
Total Number of Effluent Discharge ointsbyType
95
a. a
Combined Sewer
Constructed
10
Treated Effluent
Untreated Effluent
Overflows
Bypasses
Emergency
2 -0
Overflows
1
N/A
N/A
N/A
N/A
EPA Form 3510-2A (Revised 3-19) Page 2

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NCO089630
Joe C. Stowe, Jr. Regional WRRF
OMB No. 2040-0004
Outfalls Other Than to Waters of the United States
1.12
Does the POTW discharge wastewater to basins, ponds, or other surface impoundments that do not have outlets for
discharge to waters of the United States?
❑ Yes ❑✓ No 4 SKIP to Item 1.14.
1.13
Provide the location of each surface impoundment and associated discharge information in the table below.
Surface Im oundment Location and Discharge Data
Average Daily Volume
Continuous or Intermittent
Location
Discharged to Surface
(check one)
Impoundment
❑ Continuous
gpd
❑ Intermittent
❑ Continuous
gpd
❑ Intermittent
❑ Continuous
gpd
❑ Intermittent
z
1.14
Is wastewater applied to land?
❑ Yes ❑✓ No 4 SKIP to Item 1.16.
c
1.15
Provide the land application site and discharge data requested below.
CL y
Land Application Site and Discharge Data
0
Average Daily Volume
Continuous or
Location
Size
Applied
Intermittent
a,
check one
acres
d
gpd
❑ Continuous
o
❑ Intermittent
s
acres
gpd
❑ Continuous
o
❑ Intermittent
7
acres
gp d
❑ Continuous
R
❑ Intermittent
1.16
Is effluent transported to another facility for treatment prior to discharge?
o
❑ Yes m No -+ SKIP to Item 1.21.
1.17
Describe the means by which the effluent is transported (e.g., tank truck, pipe).
1.18
Is the effluent transported by a party other than the applicant?
❑ Yes ❑ No -+ SKIP to Item 1.20.
1.19
Provide information on the transporter below.
Trans orter Data
Entity name
Mailing address (street or P.O. box)
City or town
State
ZIP code
Contact name (first and last)
Title
Phone number
Email address
EPA Form 3510-2A (Revised 3-19) Page 3

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NCO089630
Joe C. Stowe, Jr. Regional WRRF
OMB No.2040-0004
1.20
In the table below, indicate the name, address, contact information, NPDES number, and average daily flow rate of the
receiving facility.
Receivina F cilitv Data
Facility name
Mailing address (street or P.O. box)
d
City or town
State
ZIP code
0
Contact name (first and last)
Title
0
d
Phone number
Email address
NPDES number of receiving facility (if any) ❑ None
Average daily flow rate mgd
fl
N
0
1.21
Is the wastewater disposed of in a manner other than those already mentioned in Items 1.14 through 1.21 that do not
0
have outlets to waters of the United States (e.g., underground percolation, underground injection)?
s
❑ Yes ❑✓ No 4 SKIP to Item 1.23.
0
1.22
Provide information in the table below on these other disposal methods.
Information on Other Disposal
Methods
o
Disposal
Location of
Size of
Annual Average
Continuous or Intermittent
a
Method
Disposal Site
Disposal Site
Daily Discharge
(check one)
co
Description
Volume
❑ Continuous
acres
gpd
❑ Intermittent
❑ Continuous
acres
gpd
❑ Intermittent
acres
gpd
❑ Continuous
❑ Intermittent
1.23
Do you intend to request or renew one or more of the variances authorized at 40 CFR 122.21(n)? (Check all that apply.
Consult with your NPDES permitting authority to determine what information needs to be submitted and when.)
N
❑ Discharges into marine waters (CWA ❑ Water quality related effluent limitation (CWA Section
Cr
Section 301(h)) 302(b)(2))
❑✓ Not applicable
1.24
Are any operational or maintenance aspects (related to wastewater treatment and effluent quality) of the treatment works
the responsibility of a contractor?
❑ Yes ❑✓ No +SKIP to Section 2.
1.25
Provide location and contact information for each contractor in addition to a description of the contractor's operational
and maintenance responsibilities.
Contractor Information
Contractor 1
Contractor 2
Contractor 3
0
Contractor name
(company name
E
`0
Mailing address
c
street or P.O. box
c
City, state, and ZIP
R
code
;=
Contact name (first and
0
last
Phone number
Email address
Operational and
maintenance
responsibilities of
contractor
EPA Form 3510-2A (Revised 3-19) Page 4

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCO089630 Joe C. Stowe, Jr. Regional WRRF OMB No. 2040-0004
SECTIONDD• •' • 1
c Outfalls to Waters of the United States
ir
2.1
Does the treatment works have a design flow greater than or equal to 0.1 mgd?
o
❑✓ Yes ❑ No 4 SKIP to Section 3.
0
2.2
Provide the treatment works' current average daily volume of inflow
Average Daily Volume of Inflow and Infiltration
and infiltration.
N/A d
9P
s
Indicate the steps the facility is taking to minimize inflow and infiltration.
N/A
3
0
c
r
2.3
Have you attached a topographic map to this application that contains all the required information? (See instructions for
R o.
specific requirements.)
tM
o
0
0Yes ❑ No
E
2.4
Have you attached a process flow diagram or schematic to this application that contains all the required information?
c
(See instructions for specific requirements.)
`L o
❑✓ Yes ❑ No
2.5
Are improvements to the facility scheduled?
❑✓ Yes ❑ No 4 SKIP to Section 3.
Briefly list and describe the scheduled improvements.
0
R
w
1. See Attachment #3 - Stowe RWRRF Narative
c
a
E
0
c.
2.
E
w
0
d
3.
d
4.
co
a
2.6
Provide scheduled or actual dates of completion for improvements.
Scheduled or Actual Dates of Completion for Im rovements
E
Scheduled
Affected
Begin
End
Begin
Attainment of
>
o
Improvement
Outfalls
Construction
Construction
Discharge
Operational
CL E
—
(from above)
(list o number)
(MM/DD/YYYY)
(MM/DD/YYYY)
(MM/DD/YYYY)
Level
MM/DD/YYYY
a)
1.
d
s
U)
2.
3.
4.
2.7
Have appropriate permits/clearances concerning other federal/state requirements been obtained? Briefly explain your
response.
❑✓ Yes ❑ No ❑ None required or applicable
Explanation:
Yes, all appropriate/required permits/clearances have been obtained.
EPA Form 3510-2A (Revised 3-19) Page 5

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCO089630 Joe C. Stowe, Jr. Regional WRRF OMB No. 2040-0004
SECTION•' • ON 1
3.1 Provide the following information for each outfall. (Attach additional sheets if you have more than three outfalls.)
Outfall Number 001
Outfall Number
Outfall Number
State
North Carolina
y
County
Mecklenburg County
0
0
City or town
0
s
Distance from shore
ft.
ft.
ft.
n.
d
Depth below surface
ft.
ft.
ft.
0
Average daily flow rate
N/A mgd
mgd
mgd
Latitude
Longitude
3.2
Do any of the outfalls described under Item 3.1 have seasonal or periodic discharges?
o
❑ Yes ✓❑ No 4 SKIP to Item 3.4.
d
3.3
If so, provide the following information for each applicable outfall.
s
y
Outfall Number
Outfall Number
Outfall Number
0
Number of times per year
0
discharge occurs
a
Average duration of each
o
discharge (specify units
Average flow of each
mgd
mgd
mgd
0
discharge
o
Months in which discharge
occurs
3.4
Are any of the outfalls listed under Item 3.1 equipped with a diffuser?
❑ Yes ❑✓ No 4 SKIP to Item 3.6.
3.5
Briefly describe the diffuser type at each applicable outfall.
CL
Outfall Number
Outfall Number
Outfall Number
d
0
o cd
3.6
Does the treatment works discharge or plan to discharge wastewater to waters of the United States from one or more
discharge points?
Co 3 w
❑✓ Yes ❑ No 4SKIP to Section 6.
EPA Form 3510-2A (Revised 3-19) Page 6

EPA Identification Nrrber
NPDES Pemit NuTber
Facility Narre
FormAMu ed 03h05/19
110070666903
NOD089630
be G aowe, k. Pegional VV T
C NE No. 204N0
3.7
Provide the reosivi rig water and related information if Ivx n for each outfall.
Outfall Number M
Outfall Number
Outfall Number
Receiving water narne
Catawba Fiver
Nacre of watershed, river,
Catawba F3verBasin
0
or stream system
.
a
U.S. Sal Conservation
H
Service 14digit watershed
o
code
Nacre of state
rrnrlagerren river basin
U.S. Geological -Survey
8-digit hydrologic
03050101
cataloging unit code
0iticallaw flow (acute)
95 cfS
cfs
cfs
0ibcallow flow (chronic)
unknown cfs
cfs
cfs
Total hardness at critical
n-g/L of
mg/L of
rg/L of
lowflow
unknown 6a:b
CJa003
C,aO03
3.8
Provide the fdlcW infarrlation describi rig the treatment cvided for discharges from each outfalI.
Outfall Number esr
Outfall Number
Outfall Number
Highest Level of
❑ Priniq
❑ Nmary
❑ Nrnary
Treatment (check all that
❑ Equivalent to
❑ Equivalent to
❑ Equivalent to
apply Per a fall)
secondary
secaxiary
secondary
Secondary
❑ Secondary
❑ Secondary
El Advanced
❑ Advanced
❑ Advanced
❑ Other (specify)
❑ Other (specify)
❑ Other (specify)
0
a
Design Removal Rates by
Outfall
f/!
G)
�p��
L�-/�..7OMh or D5
98.7
C
N
E
ca
a1°i
TSS
90.3 %
%
%
❑ Not applicable
❑ Not applicable
❑ Not applicable
84.8 %
%
%
❑ Not applicable
❑ Not applicable
❑ Not applicable
Nitrogen
87.2 %
%
%
Other (specify)
❑ Not applicable
❑ Not applicable
❑ Not applicable
NH3
96.6 %
%
%
EPA Form 3510-2A (Revised 3-19) Page 7

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NCO089630
Joe C. Stowe, Jr. Regional WRRF
OMB No. 2040-0004
3.9
Describe the type of disinfection used for the effluent from each outfall in the table below. If disinfection varies by
season, describe below.
d
c
w
c
0
Outfall Number 001
Outfall Number
Outfall Number
0
fl
Disinfection type
Ultraviolet Disinfection
0
a>
0
Seasons used
d
All Seasons
E
w
Dechlorination used?
❑✓ Not applicable
❑ Not applicable
❑ Not applicable
❑ Yes
❑ Yes
❑ Yes
❑ No
❑ No
❑ No
3.10
Have you completed monitoring for all Table A parameters and attached the results to the application package?
❑ Yes ❑✓ No
3.11
Have you conducted any WET tests during the 4.5 years prior to the date of the application on any of the facility's
discharges or on any receiving water near the discharge points?
❑ Yes ❑✓ No 4 SKIP to Item 3.13.
3.12
Indicate the number of acute and chronic WET tests conducted since the last permit reissuance of the facility's
discharges by outfall number or of the receiving water near the discharge points.
Outfall Number
Outfall Number
Outfall Number
Acute
Chronic
Acute
Chronic
Acute
Chronic
Number of tests of discharge
water
Number of tests of receiving
water
3.13
Does the treatment works have a design flow greater than or equal to 0.1 mgd?
❑✓ Yes ❑ No 4 SKIP to Item 3.16.
cc
w
0
3.14
Does the POTW use chlorine for disinfection, use chlorine elsewhere in the treatment process, or otherwise have
reasonable potential to discharge chlorine in its effluent?
❑ Yes 4 Complete Table B, including chlorine. ✓❑ No 4 Complete Table B, omitting chlorine.
3.15
Have you completed monitoring for all applicable Table B pollutants and attached the results to this application
package?
w
❑ Yes ✓❑ No
3.16
Does one or more of the following conditions apply?
• The facility has a design flow greater than or equal to 1 mgd.
• The POTW has an approved pretreatment program or is required to develop such a program.
• The NPDES permitting authority has informed the POTW that it must sample for the parameters in Table C, must
sample other additional parameters (Table D), or submit the results of WET tests for acute or chronic toxicity for
each of its discharge outfalls (Table E).
❑✓ Yes -+ Complete Tables C, D, and E as ❑ No 4 SKIP to Section 4.
applicable.
3.17
Have you completed monitoring for all applicable Table C pollutants and attached the results to this application
package?
❑ Yes ❑✓ No
3.18
Have you completed monitoring for all applicable Table D pollutants required by your NPDES permitting authority and
attached the results to this application package?
❑ Yes ❑✓ No additional sampling required by NPDES
permitting authority.
EPA Form 3510-2A (Revised 3-19) Page 8

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NCO089630
Joe C. Stowe, Jr. Regional WRRF
OMB No. 2040-0004
3.19
Has the POTW conducted either (1) minimum of four quarterly WET tests for one year preceding this permit application
or (2) at least four annual WET tests in the past 4.5 years?
❑ Yes ❑✓ No 4 Complete tests and Table E and SKIP to
Item 3.26.
3.20
Have you previously submitted the results of the above tests to your NPDES permitting authority?
❑ Yes ❑✓ No 4 Provide results in Table E and SKIP to
Item 3.26.
3.21
Indicate the dates the data were submitted to our NPDES permitting authority and provide a summary of the results.
Date(s) Submitted
Summary of Results
MM/DD/YYYY
ar
c
c
0
3.22
Regardless of how you provided your WET testing data to the NPDES permitting authority, did any of the tests result in
o
toxicity?
❑ Yes ❑✓ No 4 SKIP to Item 3.26.
3.23
Describe the cause(s) of the toxicity:
d
LU
w
3.24
Has the treatment works conducted a toxicity reduction evaluation?
❑ Yes ❑✓ No 4 SKIP to Item 3.26.
3.25
Provide details of any toxicity reduction evaluations conducted.
3.26
Have you completed Table E for all applicable outfalls and attached the results to the application package?
❑ Yes ❑ Not applicable because previously submitted
information to the NPDES permittinq authority.
SECTION-D•
Does the POTW receive discharges from SIUs or NSCIUs?
4.1
✓❑ Yes ❑ No 4 SKIP to Item 4.7.
d
4.2
Indicate the number of SIUs and NSCIUs that discharge to the POTW.
Number of SIUs
Number of NSCIUs
3
0
4.3
Does the POTW have an approved pretreatment program?
N
1O
x
❑✓ Yes ❑ No
4.4
Have you submitted either of the following to the NPDES permitting authority that contains information substantially
identical to that required in Table F: (1) a pretreatment program annual report submitted within one year of the
application or (2) a pretreatment program?
r
N
❑ Yes ❑ No 4 SKIP to Item 4.6.
0
4.5
Identify the title and date of the annual report or pretreatment program referenced in Item 4.4. SKIP to Item 4.7.
N
7
c
4.6
Have you completed and attached Table F to this application package?
❑ Yes ❑ No
EPA Form 3510-2A (Revised 3-19) Page 9

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NCO089630
Joe C. Stowe, Jr. Regional WRRF
OMB No. 2040-0004
4.7
Does the POTW receive, or has it been notified that it will receive, by truck, rail, or dedicated pipe, any wastes that are
regulated as RCRA hazardous wastes pursuant to 40 CFR 261?
❑ Yes ❑✓ No -+ SKIP to Item 4.9.
4.8
If yes, provide the foliowin information:
Annual
Hazardous Waste
Waste Transport Method
Amount of
Units
Number
(check all that apply)
Waste
Received
❑ Truck ❑ Rail
❑ Dedicated pipe ❑ Other (specify)
O
U
d
❑ Truck ❑ Rail
❑ Dedicated pipe ❑ Other (specify)
y
7
O
N
❑ Truck ❑ Rail
_
❑ Dedicated pipe ❑ Other (specify)
N
N
4.9
Does the POTW receive, or has it been notified that it will receive, wastewaters that originate from remedial activities,
y
including those undertaken pursuant to CERCLA and Sections 3004(7) or 3008(h) of RCRA?
0
❑ Yes ❑✓ No 4 SKIP to Section 5.
4.10
Does the POTW receive (or expect to receive) less than 15 kilograms per month of non -acute hazardous wastes as
specified in 40 CFR 261.30(d) and 261.33(e)?
❑ Yes -+ SKIP to Section 5. ❑ No
4.11
Have you reported the following information in an attachment to this application: identification and description of the
site(s) or facility(ies) at which the wastewater originates; the identities of the wastewater's hazardous constituents; and
the extent of treatment, if any, the wastewater receives or will receive before entering the POTW?
❑ Yes ❑ No
SECTION•
-• • i
Does the treatment works have a combined sewer system?
E
5.1
Ca
❑ Yes ❑✓ No -+SKIP to Section 6.
5.2
Have you attached a CSO system map to this application? (See instructions for map requirements.)
c
Q
❑ Yes ❑ No
co
0
5.3
Have you attached a CSO system diagram to this application? (See instructions for diagram requirements.)
U
El Yes El No
EPA Form 3510-2A (Revised 3-19) Page 10

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NCO089630
Joe C. Stowe, Jr. Regional WRRF
OMB No.2040-0004
5.4
For each CSO outfall, provide the following information. Attach
additional sheets as necessar .
CSO Outfall Number
CSO Outfall Number
CSO Outfall Number
City or town
0
State and ZIP code
Z3
o
County
Latitude
0
0
CO
U
Longitude
°
°
o
Distance from shore
ft.
Depth below surface
5.5
Did the POTW monitor any of the following items in the past year for its CSO outfalls?
CSO Outfall Number
CSO Outfall Number
CSO Outfall Number
Rainfall
❑ Yes ❑ No
❑ Yes ❑ No
❑ Yes ❑ No
c
o
CSO flow volume
❑ Yes ❑ No
❑ Yes ❑ No
❑ Yes ❑ No
CSO pollutant
❑ Yes ❑ No
❑ Yes ❑ No
❑ Yes ❑ No
0
concentrations
CO
U
Receiving water quality
❑ Yes ❑ No
❑ Yes ❑ No
❑ Yes ❑ No
CSO frequency
❑ Yes ❑ No
❑ Yes ❑ No
❑ Yes ❑ No
Number of storm events
❑ Yes ❑ No
❑ Yes ❑ No
❑ Yes ❑ No
5.6
Provide the following information for each of your CSO outfalls.
CSO Outfall Number
CSO Outfall Number _
CSO Outfall Number _
Number of CSO events in
events
events
events
z
the past year
cAverage
duration per
hours
hours
hours
event
❑ Actual or ❑ Estimated
❑ Actual or ❑ Estimated
❑ Actual or ❑ Estimated
a�
w'
million gallons
million gallons
million gallons
0
Average volume per event
❑ Actual or ❑ Estimated
❑ Actual or ❑ Estimated
❑ Actual or ❑ Estimated
Minimum rainfall causing
inches of rainfall
inches of rainfall
inches of rainfall
a CSO event in last year
❑ Actual or ❑ Estimated
❑ Actual or ❑ Estimated
❑ Actual or ❑ Estimated
EPA Form 3510-2A (Revised 3-19) Page 11

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NCO089630
Joe C. Stowe, Jr. Regional WRRF
OMB No.2040-0004
5.7
Provide the information in the table below for each of your CSO outfalls.
CSO Outfall Number _
CSO Outfall Number
CSO Outfall Number
Receiving water name
Name of watershed/
streams stem
N
U.S. Soil Conservation
❑ Unknown
❑ Unknown
❑ Unknown
�
Service 14-digit
watershed code
>
if known
Name of state
management/river basin
coU.S.
Geological Survey
❑ Unknown
❑ Unknown
❑ Unknown
8-Digit Hydrologic Unit
Code if known
Description of known
water quality impacts on
receiving stream by CSO
(see instructions for
exam les
SECTION•
In Column 1 below, mark the sections of Form 2A that you have completed and are submitting with your application. For
6.1
each section, specify in Column 2 any attachments that you are enclosing to alert the permitting authority. Note that not
all applicants are required to provide attachments.
Column 1
Column 2
❑ Section 1: Basic Application
❑ w/ variance request(s) ❑✓ w/ additional attachments
Information for All Applicants
❑ Section 2: Additional
❑✓ w/ topographic map ❑✓ w/ process flow diagram
Information
✓❑ w/ additional attachments
❑ w/ Table A ❑ w/ Table D
❑ Section 3: Information on
❑ w/ Table B ❑ w/ Table E
Effluent Discharges
E
❑ w/ Table C ❑ w/ additional attachments
cc
Section 4: Industrial
❑ w/ SIU and NSCIU attachments ❑ w/ Table F
U
`s
❑ Discharges and Hazardous
❑
Wastes
w/ additional attachments
5: Combined Sewer
E]
❑ wl CSO map / i tiva
El
UOverflows
❑ w/ CSO system diagram
Section 6: Checklist and
❑✓
❑ w/ attachments ) (i i a 0 3 ')4
Certification Statement
6.2
Certification Statement
���
1 certify under penalty of law that this document and all attachments were prepare 0� iO pti�h►i�Ydn P
he
accordance with a system designed to assure that qualified personnel properly ga r 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. 1 am aware that there are significant penalties for submitting false information, including the possibility of fine
and imprisonment for knowing violations.
Name (print or type first and last name)
Official title
Steven Joseph Lockler
Operations Chief
Signature
Date signed
J -� Z'_
-e ( Q I i ay
S
EPA Form 3510-2A (Revised 3-19) Page 12

Attachment # 1

t •u y ,'
"
oil
Hatt
q'Oj- 1AVE11l / x
`ti 1 ; `•](� 9i Wa kid '•!�� c e !� ° ag �� / .8I.
a j .•/� _ A asap y c
\,\ � I
• • if e� ; bsta�
i \
Approximate /
6a� I j ,% Plant Location
`' ,•J �r _ / ? I 35.28022,-81.00630
(It?csufit Holly wvlrrp il/�/ I�• i �; b �l
d Q• 1 t /�
outfall 001
l / 7j ■ /� % , / I �� i� 35.28029,-81.00839 , y
e
ti
,�• to t,� "eea ) �` % / 43'`�i�Jl Ex. Long Creek
Pump Station
` / ` t , _ w, 1 ' ' '( iP 1 \ �,•�" -� j 35.27998,-81.00183 ,
--. _ • / PO 'y~\ - /� ��' � (+ WTs�/� ° �y �/i' "'tip jr`•: 4--•
i^. -: v 1\\.l1 .ti-�. -.r ' l�;'/� i I i .. _ .\` t 4 F,',+ f •;;/�jl
s AV£�-F:KJ i ` �• f
Charlotte Water — Joe C. Stowe, Jr. RWRRF
N
NCO089630
County: Mecklenburg
SCALE T
Receiving Stream: Catawba River
USGS Quad #: Stream Classification: WS-IV, CA
E17NW (Mount Holly), 1:24,000 River Basin: Catawba
E17NE (Mountain Island Lake) (1" = 20001 Sub -Basin/ 8-Digit HUC #: 03-08-33/ 03050101
Ill

Attachment # 2

- PARALLEL FORCE MAINS
FROM INFLUENT PUMP
STATION
SECONDARY
ADDITION
POINT
1 _
W_
LL Z W
Rom
UmU
a1ni­-
25U)
Fr
D_
PRIMARY
CLARIFIER 2
ISSUED FOR DATE
Sc
FUTURE
-- PRIMARY
CLARIFIER 3
PRIMARY
CLARIFIER 1
PRIMARY SLUDGE PRIMARY SLUDGE PUMP
PUMP STATION
----------------------- ------- -
I
I
I
I
I
I
PRIMARY SCUM PUMPS
I
I
I
a
I
a a
m F
T
r----_ ---w{ PRIMARY
ALTERNATE
I I
r---T--►{ ADDITION
ADDITION
I I
j i i I POINT
POINT
I I
I
J
SUC
I
j I 1 I
I I 1
SDCi
I
i I
I
ADDITION
POINT
PROJECT
ENGINEER P. DRUMMEY STIEGEL
DESIGNED BY M. MCLAMB
DRAWN BY. C. ALLEN
CHECKED BY. P. DRUMMEY STIEGEL
IF THIS BAR DOES NOT 0 112" 1
MEASURE 1" THEN DRAWING
IS NOT TO FULL SCALE
I
BY OTHERS
I
I I
SLUDGE
SLUDGE SLUDGE TRANSFER TO
HOLDING HOLDING MCALPINE
TANK 1 TANK 2 CREEK WWMF
I I
L� — — � — — wns�
I f --Tr —_ -----T--T--7--7--7--
' I I I I I I I I I I I
1�91�11�91�91 �y 1 I I I I I I
7--7---
I I
I I I
--
I
I
t _
Io� _
I I
-r-- ---�' � 1 1 1 L
1 1 1
1
T►�41----4---4-
FUTURE I
I
I I • L--— �1
I ❑T -- _— BNR j
— *
L_rI I I IBASINS 3-al
--�---
—
rI *.�►+-.t---I---t- 1 1 1 f I
1 I
11
PRIMARY
I I I I I I/4.y I I
I IL I I I I I I I
I I I
I I
I I ADDITION
POINT
I
I J— I
I MS
ATI-� I I ® ® ® ® ® ®
J
®
®
FCI
TYP 4
!!10-0
Emee YPA-' JE_
....
Hazen
HAZEN AND SAWYER
9101 SOUTHERN PINE BOULEVARD
CHARLOTTE, NORTH CAROLINA 28273
LICENSE NO.: C-OW1
fir_
...........
AERATION
BLOWERS
Carney
[ONS777UCT/ON
y
FUTURE PILOT TRAIN
SURFACE WASTING
PUMP STATION
FINAL
CLARIFIER 2
BNR BASINS 1.4
SURFACE WASTING
PUMP STATION
RAS PUMP
STATION
/ FUTURE
DRAIN FROM
I FINAL I
BNR BASIN
I CLARIFIER 4
L
_——RAS-
\—RAS
-SC
FCE
CSC
FCE
RAS
FC
SCUM
N FINAL
PS CLARIFIER 3
RAS
TO PLANT
DRAIN PUMP
STATION
SECONDARY
ADDITION MS
POINT
I�*
- 17---T---
I 1 1
I I I
I
w
—_
oo
I LU
co
Q W
1jQm
1 I = W ~
U) W
? O
AIR SCOUR
; ;LLFLL
SU)
BLOWERS
I 0_1;
;
Q
I I 1
m
FT?TyT?TyT?T
..
FOB
� I
F
0' W
LLIL
i
I
I
I
I
J_I�J
I
i
I
FUTUREI ________________ ---
BACKWASH TO PROCESS DRAIN
SUPPLY PUMP STATION
CHARLOTTE Stowe Regional
W4JER ee c ery fa Yl,y
CHARLOTTE, NORTH CAROLINA
STOWE REGIONAL WATER
RESOURCE RECOVERY FACILITY
STAGE 2
FLUENT INFLUENT
WELL CHANNEL
--- FE--------- BACKWASH
Bws
SUPPLY PUMP
----------
WET WELL
uv
I
I
CHANNELS
I
EFFLUENT P�F �M}#
WELL rm
WEIR
WELL
TO PLANT
NPW/RCW
DISTRIBUTION
Fm
SHS
NON -POTABLE
WATER/ON-POCLAIMED
STEP CASCADE WATER
0
POST AERATION
PLANT EFFLUENT TO CATAWBA RIVER
DATE: FEBRUARY 2023
HAZENNO.: 31460-001
GENERAL CONTRACT NO 1
PROCESS MECHANICAL
PROCESS FLOW DIAGRAM N MBER
M2

Attachment # 3

The Stowe Regional Water Resource Recovery Facility (WRRF) is currently under construction
and is anticipated to be completed at the earliest in the first quarter of 2027 and the latest by the
third quarter of 2027 pending weather or other unforeseen circumstances.
The work completed to date includes the major excavations (earthwork, dewatering, shoring) for
all structures on site. Additionally, structural concrete has been completed at the Primary
Clarifier Distribution Structure, Primary Clarifier No. 1, BNR Distribution Structure, Final Clarifier
No. 1&2, Headworks basement grit room, and EQ Basin No. 2 Cell 2. Approximately 1/3 of the
yard piping has been installed to date. Several pieces of process equipment have been installed
such as the primary clarifier mechanisms and the flow equalization tank mixers.
The upcoming work includes the continuation of concrete placements at Headworks and Influent
Pump Station, EQ Basin No. 2 Cell 1, Primary Sludge Pump Station, BNR Basins, RAS Pump
Station, Filter Facility, UV Disinfection Facility, and Plant Drain Pump Station. The installation of
underground utilities such as yard piping and ductbank will continue as well as backfilling and
waterproofing available structures. Addition process equipment will be installed as it arrives on
site.
Based on the current schedules provided by the various contractor teams the following are the
tentative key milestones for the Stowe WRRF Project:
1. August 2024: Clean water functional testing of Mount Holly Pump Station.
2. March 2025: Mount Holly Pump Station Online (flow goes into Charlotte Water system
but not the Stowe WRRF).
3. March 2026: Clean water functional testing of Stowe WRRF.
4. May 2026: Wastewater seeding at Stowe WRRF begins.
5. August 2026: Stowe WRRF begins to discharge to the Catawba River.
6. February 2027: Stowe WRRF commissioning complete.

Attachment # 4

DocuSign Envelope ID: FEC24750-C37A-48D8-9555-F6BF71 B4BOE1
ROY COOPER
Govemor
ELIZABETH S. BISER
Secretory
RICHARD E. ROGERS, JR.
Director
NORTH CAROLINA
£nvironmentat Quality
March 12, 2024
Ms. Nicole Bartlett P.E., Senior Project Manager
Charlotte Water
5100 Brookshire Blvd.
Charlotte, NC 28216
Subject: Review of Catawba River DO Modeling Report
Stowe Regional WRRF
NPDES Permit No. NCO089630
Mecklenburg County
Catawba River Basin
Dear Ms. Bartlett:
The Division of Water Resources (DWR) Modeling and Assessment Branch reviewed the modeling files and
report submitted on December 8, 2023 by HDR, Inc on behalf of Charlotte Water. The purpose of this
modeling project was to evaluate the impact of changing the dissolved oxygen (DO) limit for Phase Il of
Stowe Regional WWRF change from 7 mg/L to 6 mg/L. Although the original modeling plan was to use a
steady-state model QUAL2K, flow releases from the Mountain Island Dam approximately 4 miles upstream
of the discharge location were observed to be causing large diel fluctuations in streamflow. To account for the
hydrology of study area, the reported assessment was made using a dynamic version of the model
QUAL2KW.
The submitted calibration and scenario runs were reproduced and it was verified that they were consistent
with the modeling report. Model inputs for the scenario runs were examined to verify that the only inputs that
were changed were permitted DO concentration limits of the Stowe Regional WRRF from 7 mg/L to 6 mg/L.
Simulated stream DO was decreased to a varying degree as the result of changing the DO limit, and the
maximum DO decrease was 0.11 mg/L as reported. All simulated hourly stream DO values were greater than
4 mg/L with daily averages above 5 mg/L. The impact of DO limit change was mostly limited to the
immediate discharge location (reach 8). These findings appear reasonable and in support of the proposed
effluent DO limit change.
As a cautionary note, the submitted QUAL2KW model has several shortcomings and limitations that prevent
its application beyond this study's goal (testing the impact of effluent DO change for the Stowe WRRF):
• The river sampling data collected for this study indicate that vertical temperature and DO
stratification may start developing near downstream of the proposed Stowe WRRF outfall location
during the summer periods, likely due to the backwater effects from Lake Wylie. The observed
stratification became more pronounced in the downstream portions of the modeling domain. The
QUAL2KW is a one-dimensional model and limited in its ability to represent vertically stratified
waters.
• Surface water samples collected during the summer periods in the downstream areas show signs of
DO supersaturation, suggesting elevated algal activities, large diel DO swings and significant
sediment oxygen demand. Currently only factors affecting dissolved oxygen in the model are
North Carolina Department of Environmental Quality I Division of Water Resources
D E Q 512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000
a'.urwaE.m:emrenw a.u\ ��

DocuSign Envelope ID: FEC24750-C37A-48D8-9555-F6BF71B4BOE1
biological oxygen demand (BOD) degradation, nitrification and reaeration without algal processes
and sediment oxygen demand.
Although hourly values of temperature and water quality variables are specified for the headwater,
meteorological inputs (e.g., atmospheric temperature) have no diel variation. As a result, diel
variation in simulated DO diminishes as the water moves downstream, and the model does not appear
to be doing well in reproducing the observed pattern of DO in the downstream portion of the modeled
domain.
Despite these shortcomings, the submitted model appears appropriate for assessing the impact of DO limit
change for the Stowe WRRF, considering that the impact is mostly limited to the immediate discharge
location in the relatively upstream area. The modeling results appear to support the proposed change in the
Stowe WRRF effluent DO limit from 7 mg/L to 6 mg/L at the discharge flow of 25 MGD. The modeling
results should be interpreted with care, considering the limitations outlined earlier. It is essential not to extend
their use beyond evaluating the impact of effluent dissolved oxygen (DO) changes for the Stowe WRRF.
To proceed with the NPDES permitting process, Charlotte Water can choose to either submit a modification
request package and corresponding fee at this time to the Municipal Permitting Branch OR include the
modification request in the permit renewal package and avoid a second fee.
Please let us know if you have any questions regarding these comments and recommendations and we will
schedule a meeting to discuss.
Respectfully,
f�ID.oc'u,Siigneldby�:
%, `Kh(&''`
C4645311316"FE...
Michael Montebello
NPDES Program Branch Chief
ec: NPDES Files [Laserfiche]
Charlotte Water / Nicole Bartlett [[e-mail]]
HDR Inc. / Barry Shearin [[e-mail]]
DWR / Pam Behm [[e-mail]]; Kristin Litzenberger [[e-mail]]; Nick Coco
[[e-mail]]; Bongghi Hong [[e-mail]]; Adugna Kebede [[e-mail]]; Derek
Denard [[e-mail]]
Mooresville Regional Office / Andrew Pitner [andrew.pitner@ deq.nc.gov]
North Carolina Department of Environmental Quality I Division of Water Resources
D EQ512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1611
,��,-�
o.r.a.Mar,� 1 919.707.9000