NC0089630_Application (ATC)_20231031

CDM
Smith
4600 Park Road,Suite 240 RECEIVED
Charlotte,North Carolina 28209
tel:[phone]
OCT 312023
October 27, 2023 NCDEQ/DWR/NPDES
NPDES Complex Permitting Unit
North Carolina Division of Water Resources
1617 Mail Service Center
Raleigh,North Carolina 27699
Subject: Stowe Regional Water Resource Recovery Facility
Regional Solids Conveyance Phase 1A-Package 2
Authorization to Construct Application
To Whom It May Concern:
Charlotte Water proposes to construct solids screening and storage facilities at the new Stowe
Regional Water Resource Recovery Facility(WRRF) (NPDES Permit No. NC0089630).The Stowe
Regional WRRF currently has a permitted capacity of 15 mgd (Phase 1) and 25 mgd (Phase 2).
Enclosed is an application for Authorization to Construct approval to accomplish this work.The
project includes construction of new waste activated sludge(WAS) and primary solids (PS) storage
basins,sludge processing and screening facilities,and odor control equipment at the Stowe
Regional WRRF. Major components of the project include the WAS storage tanks; the PS storage
tanks;submersible mixers inside the storage tanks;two pressurized solids screens inside a new
building; a monorail track and hoist for the screens; and odor control equipment located on a pad
between the new storage tanks and the new building.The project also includes installation of
interior,exterior,and buried piping,and valves.
The construction timeline for the project is summarized below:
• April 2024-Anticipated Notice to Proceed
• August 2026-Anticipated Final Completion
The following attachments are included as part of this application:
• Application for Authorization to Construct(Section 1)
• NPDES Permit(Section 2)
• Record of Decision (Section 3)
• Bid Form (Section 4)
i0
WATER+ENVIRONMENT+TRANSPORTATION+ENERGY+FACILITIES

CDM
Smith
NPDES Complex PermittingUnit
p
October 27, 2023
Page 2
•
Engineering Calculations (Section 5)
• Stowe Regional WRRF and McAlpine Creek WWMF Residuals Management Plans (Section
g p g 6)
• Engineering Plans and Specifications
• USB drive containing digital copies of Sections 1 through 6 and the Engineering Plans and
Specifications
A check in the amount of$1,000 is enclosed as payment of the application fee.
Please review the application and let me know if you have any questions. Thank you for your
assistance.
Sincer ly,
Laurin B. K nnedy, PE, P
Associate
CDM Smith Inc.
cc: Nicole Bartlett, Charlotte Water
Carl Wilson, Charlotte Water
Project File (1363-235084)
0
Cover Letter.docx

CDM
RECEIVED Smith
OCT 312023
Transmittal
CDM Smith NCDEQIDWRINPDES
4600 Park Road Suite 240
Charlotte, North Carolina 28209
tel: [phone]
fax: [phone] PACKAGE 1 OF 2
NC DEQ DIV OF WATER RESOURCES
To: NPDES From: Heidi Hopkins obo Laurin Kennedy
Organization/ Division of Water Resources
Address: 512 N.Salisbury Street,9th Floor Date: October 30, 2023
[phone]
Re: Stowe RWRRF Authorization to Construct (ATC)
Job#: 235084-tk600a.2.
Via: Mall: Overnight: X Courier.
Enclosed please find: SEE DETAILS BELOW(ALL ITEMS EXCEPT PLANS(PACKAGE 2)
For your information X Approved
For your review X Approved as noted
For your signature Returned to you for correction
Message:
NC DEQ DIV OF WATER RESOURCES NPDES,
Enclosed, please find the complete submittal package for your review with the following items:
• Application for Authorization to Construct(Section 1)
• NPDES Permit(Section 2)
• Record of Decision (Section 3)
• Bid Form (Section 4)
• Engineering Calculations(Section 5)
• Stowe Regional WRRF and McAlpine Creek WWMF Residuals Management Plans(Section 6)
• Engineering Plans(Package 2)and Specifications
• USB drive containing digital copies of Sections 1 through 6 and the Engineering Plans and Specifications
• A check in the amount of$1,000 is enclosed as payment of the application fee.
Thank You,
Heidi Hopkins obo
Laurin Kennedy, PE, PMP
Senior Project Manager
CDM Smith
CDM Smith Charlotte Office

CDM
Smith
4600 Park Road,Suite 240
Charlotte,North Carolina 28209
tel:[phone] RECEIVED
October 27, 2023 OCT 31 2.023
NPDES Complex Permitting Unit NCDEQIWRINPDES
North Carolina Division of Water Resources
1617 Mail Service Center
Raleigh, North Carolina 27699
Subject: Stowe Regional Water Resource Recovery Facility
Regional Solids Conveyance Phase 1A- Package 2
Authorization to Construct Application
To Whom It May Concern:
Charlotte Water proposes to construct solids screening and storage facilities at the new Stowe
Regional Water Resource Recovery Facility(WRRF) (NPDES Permit No.NC0089630).The Stowe
Regional WRRF currently has a permitted capacity of 15 mgd (Phase 1) and 25 mgd (Phase 2).
Enclosed is an application for Authorization to Construct approval to accomplish this work.The
project includes construction of new waste activated sludge (WAS) and primary solids (PS) storage
basins,sludge processing and screening facilities,and odor control equipment at the Stowe
Regional WRRF. Major components of the project include the WAS storage tanks; the PS storage
tanks; submersible mixers inside the storage tanks; two pressurized solids screens inside a new
building; a monorail track and hoist for the screens; and odor control equipment located on a pad
between the new storage tanks and the new building.The project also includes installation of
interior,exterior,and buried piping, and valves.
The construction timeline for the project is summarized below:
• April 2024-Anticipated Notice to Proceed
• August 2026-Anticipated Final Completion
The following attachments are included as part of this application:
• Application for Authorization to Construct(Section 1)
• NPDES Permit(Section 2)
• Record of Decision (Section 3)
• Bid Form (Section 4)
ifi
WATER+ENVIRONMENT+TRANSPORTATION+ENERGY+FACILITIES

CDM
Smith
NPDES Complex Permitting Unit
October 27, 2023
Page 2
• Engineering Calculations (Section 5)
• Stowe Regional WRRF and McAlpine Creek WWMF Residuals Management Plans (Section 6)
• Engineering Plans and Specifications
• USB drive containing digital copies of Sections 1 through 6 and the Engineering Plans and
Specifications
A check in the amount of$1,000 is enclosed as payment of the application fee.
Please review the application and let me know if you have any questions. Thank you for your
assistance.
Sincer ly,
Laurin B. K nnedy,PE, P
Associate
CDM Smith Inc.
cc: Nicole Bartlett,Charlotte Water
Carl Wilson, Charlotte Water
Project File (1363-235084)
0
Cover Letter.docx

SECTION 1
C-
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(I)

State of North Carolina
DWR Department of Environmental Quality
Division of Water Resources
Division of Water Resources APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
SECTION 1: INSTRUCTIONS AND INFORMATION
A. The Division of Water Resources will accept this application package for review only if all of the items are provided and the
application is complete. Failure to submit all of the required items will result in the application package being returned as
incomplete per 15A NCAC 02T.0105(b).
B. A check or money order must be submitted in the amount of$1000.00 dated within 90 days of application submittal and made
payable to North Carolina Department of Environmental Quality(NCDEQ).
C. Plans and specifications must be prepared in accordance with 15 NCAC 02H. 0100, I5A NCAC 02T, North Carolina General
Statute 133-3,North Carolina General Statute 143-215.1,and Division of Water Resources Minimum Design Criteria for NPDES
Wastewater Treatment Facilities.
D. The plans and specifications submitted must represent a completed final design that is ready to advertise for bid.
E. Any content changes made to this Form ATC 10-23 shall result in the application package being returned.
F. The Applicant shall submit ONE ORIGINAL and ONE DIGITAL COPY (CD) of the application, all supporting documentation
and attachments. All information must be submitted bound or in a 3-ring binder, with a Section tab for each Section. except the
Engineering Plans.
G. Check the boxes below to indicate that the information is provided and the requirements are met.
H. If attachments are necessary for clarity or due to space limitations, such attachments are considered part of the application
package and must be numbered to correspond to the item referenced.
I. For any project that requires review under the State Environmental Policy Act(SEPA), an Authorization to Construct cannot be
issued prior to the completion of a State Clearinghouse advertisement period for a FONSI,EIS,etc.unless the project qualifies for
a Determination of Minor Construction Activity.
J. For more information,visit the Division of Water Resources web site at: http://portal.ncdenr.org/web/wq/swp/ps/npdes.
K. In addition to this Authorization to Construct,the Applicant should be aware that other permits may be required from other Sections
of the Division of Water Resources(for example: reclaimed water facilities permits;Class A or B biosolids residuals permit).
SECTION 2: APPLICANT INFORMATION AND PROJECT DESCRIPTION
A. APPLICANT
Applicant's name City of Charlotte
Signature authority's name per 15A NCAC 02T.0106(b) Joseph C. Wilson,P.E.
Signature authority's title Chief Engineer
Complete mailing address 5100 Brookshire Boulevard,Charlotte,NC 28216
Telephone number 704-336-1083
Email address [e-mail]
B. PROFESSIONAL ENGINEER
Professional Engineer's name Laurin Kennedy
Professional Engineer's title Associate
North Carolina Professional Engineer's License No. NC030770
Firm name CDM Smith
Firm License number F-1255
Complete mailing address 4600 Park Road,Suite 240,Charlotte,NC 28209
Telephone number 704-208-2216
Email address [e-mail]
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 1

State of North Carolina
DWR Department of Environmental Quality
Division of Water Resources
Division of Water Resources APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
C. NPDES PERMIT
NPDES Permit number NC0089630
Current Permitted flow(MGD)—include permit Phase 1 - 15.0 MGD
flow phases if applicable Phase 2-25.0 MGD
D. PROJECT DESCRIPTION
Provide a brief description of the project: Project includes construction of new waste activated sludge(WAS)and primary solids
(PS)storage basins,sludge processing and screening facilities,and odor control equipment at the Stowe Regional Water
Resources Reclamation Facility(WRRF). Major components of the project include the WAS storage tanks;the PS storage tanks;
submersible mixers inside the storage tanks;two pressurized solids screens inside of a new building;a monorail track and hoist
for the screens;and odor control equipment located on a pad between the new storage tanks and the new building.The project
also includes installation of interior,exterior,and buried piping and valves.
p g
SECTION 3: APPLICATION ITEMS REQUIRED FOR SUBMITTAL FOR ALL PROJECTS
A. Cover Letter
• The letter must include a request for the Authorization to Construct; the facility NPDES Number; a brief project description
that indicates whether the project is a new facility, facility modification, treatment process modification, or facility
expansion;the construction timeline;and a list of all items and attachments included in the application package.
O If any of the requirements of 15 NCAC 02H. 0100, 15A NCAC 02T,North Carolina General Statute 133-3, North Carolina
General Statute 143-215.1, and Division of Water Resources Minimum Design Criteria for NPDES Wastewater Treatment
Facilities are not met by the proposed design,the letter must include an itemized list of the requirements that are not met.
B. Application Fee(All New and Modification Application Packages):
® Submit a check or money order in the amount of$1,000.00,dated no more than 90 days prior to application submittal.
➢ Payable to North Carolina Department of Environmental Quality(NCDEQ)
C. NPDES Permit
® Submit Part I of the Final NPDES permit for this facility that includes Part A (Effluent Limitations and Monitoring
Requirements)for the monthly average flow limit that corresponds to the work that is requested for this project.
D. Special Order by Consent
❑ If the facility is subject to any Special Orders by Consent(SOC),submit the applicable SOC.
El Not Applicable.
E. Finding of No Significant Impact or Record of Decision
® Submit a copy of the Finding of No Significant Impact or Record of Decision for this project.
❑ Provide a brief description of any of the mitigating factors or activities included in the approved Environmental Document
that impact any aspect of design of this project, if not specified in the Finding of No Significant Impact or Record of
Decision.
❑ Not Applicable.
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 2

State of North Carolina
DWRDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
F. Engineering Plans
• Per 15A NCAC 02T.0504(c)(1),submit one set of detailed plans that have been signed,sealed and dated by a North Carolina
Licensed Professional Engineer.
® Per 21 NCAC 56 .I I03(a)(6),the name, address and License number of the Licensee's firm shall he included on each sheet
of the engineering drawings.
® Plans must be labeled as follows: FINAL DRAWING—FOR REVIEW PURPOSES ONLY—NOT RELEASED FOR
CONSTRUCTION.
® 15A NCAC 02H .0124 requires multiple (dual at a minimum) components such as pumps, chemical feed systems, aeration
equipment and disinfection equipment. Is this requirement met by the design? ® Yes or ❑ No. If no, provide an
explanation:
Plans shall include:
® Plans for all applicable disciplines needed for bidding and construction of the proposed project(check as appropriate):
® Civil 0 Not Applicable
® Process Mechanical ❑Not Applicable
® Structural 0 Not Applicable
® Electrical 0 Not Applicable
® Instrumcntation/Controls ❑Not Applicable
® Architectural ❑Not Applicable
El Building Mechanical ❑Not Applicable
D Building Plumbing ❑Not Applicable
® Plan and profile views and associated details of all modified treatment units including piping,valves,and equipment(pumps,
blowers,mixers,diffusers,etc.)
® Are any modifications proposed that impact the hydraulic profile of the treatment facility? ❑ Yes or ® No. If yes, provide
a hydraulic profile drawing on one sheet that includes all impacted upstream and downstream units. The profile shall include
the top of wall elevations of each impacted treatment unit and the water surface elevations within each impacted treatment
unit for two flow conditions: (1)the NPDES permitted flow with all trains in service and(2) the peak hourly flow with one
treatment train removed from service.
® Are any modifications proposed that impact the process flow diagram or process flow schematic of the treatment facility? ❑
Yes or®No. If yes,provide the process flow diagram or process flow schematic showing all modified flow paths including
aeration,recycle/return,wasting,and chemical feed,with the location of all monitoring and control instruments noted.
G. ® Engineering Specifications
® Per 15A NCAC 02T.0504(c)(2),submit one set of specifications that have been signed, sealed and dated by a North Carolina
Licensed Professional Engineer.
El Specifications must be labeled as follows: FINAL SPECIFICATIONS — FOR REVIEW PURPOSES ONLY — NOT
RELEASED FOR CONSTRUCTION.
Specifications shall include:
® Specifications for all applicable disciplines needed for bidding and construction of the proposed project (check as
appropriate):
® Civil 0 Not Applicable 0 Instrumentation/Controls 0 Not Applicable
® Process Mechanical 0 Not Applicable El Architectural ❑Not Applicable
® Structural ❑Not Applicable ® Building Mechanical 0 Not Applicable
® Electrical 0 Not Applicable ® Building Plumbing 0 Not Applicable
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 3

State of North Carolina
DW R Department of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
D Detailed specifications for all treatment units and processes including piping, valves, equipment (pumps, blowers, mixers,
diffusers,etc.),and instrumentation.
® Means of ensuring quality and integrity of the finished product including leakage testing requirements for structures and
pipelines,and performance testing requirements for equipment.
® Bid Form for publicly bid projects.
H. Construction Sequence Plan
® Construction Sequence Plan such that construction activities will not result in overflows or bypasses to waters of the State.
The Plan must not imply that the Contractor is responsible for operation of treatment facilities. List the location of the
Construction Sequence Plan as in the Engineering Plans or in the Engineering Specifications or in both: Engineering
Specifications(Section 013513.54)
I. Engineering Calculations
l Per I5A NCAC 02T .0504(c)(3), submit one set of engineering calculations that have been signed, sealed and dated by a
North Carolina Licensed Professional Engineer; the seal, signature and date shall be placed on the cover sheet of the
calculations.
For new or expanding facilities and for treatment process modifications that are included in Section 4.C, the calculations
shall include at a minimum:
❑ Demonstration of how peak hour design flow was determined with a justification of the selected peaking factor.
❑ Influent pollutant loading demonstrating how the design influcnt characteristics in Section 4.B.2 of this form were
determined.
❑ Pollutant loading for each treatment unit demonstrating how the design effluent concentrations in Section 4.B.2 of this form
were determined.
IO Hydraulic loading for each treatment unit.
El Sizing criteria for each treatment unit and associated equipment(blowers,mixers,pumps,etc.)
❑ Total dynamic head(TDH)calculations and system curve analysis for each pump specified that is included in Section 4.C.6.
❑ Buoyancy calculations for all below grade structures.
O Supporting documentation that the specified auxiliary power source is capable of powering all essential treatment units.
J. Permits
® Provide the following information for each permit and/or certification required for this project:
Permit/ If Not Issued Provide
Not Date Date Certification Status and Expected
Permit/Certification Applicable Submitted Approved Number Issuance Date
Dam Safety X
Soil Erosion and Sediment Control 11/29/22 MECKL-
22-018
202-018
USCOE /Section 404 Permit X
Water Ouality Certification(401) X
USCOE/Section l0 X
Stormwater Management Plan 4/24/23 LDC-2022-
00207
LAMA X
NCDOT Encroachment Agreement X
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 4

State of North Carolina
DWR Department of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
Railroad Encroachment Agreement X
Other:Mecklenburg County
Building Permit and City of 11/1/23
Charlotte Commercial Plan Review (anticipated)
K. Residuals Management Plan
El For all new facilities, expanding facilities, or modifications that result in a change to sludge production and/or sludge
processes, provide a Residuals Management Plan meeting the requirements of I5A NCAC 02T.0504(j) and .0508;the Plan
must include:
El A detailed explanation as to how the generated residuals (including trash, sediment and grit) will be collected, handled,
processed,stored,treated,and disposed.
El An evaluation of the treatment facility's residuals storage requirements based upon the maximum anticipated residuals
production rate and ability to remove residuals.
El A permit for residuals utilization or a written commitment to the Applicant from a Permittee of a Department approved
residuals disposal/utilization program that has adequate permitted capacity to accept the residuals or has submitted a
residuals/utilization program application.
® If oil,grease,grit or screenings removal and collection is a designated unit process,a detailed explanation as to how the
oil/grease will be collected,handled,processed,stored and disposed.
❑ Not Applicable.
SECTION 4: PROJECT INFORMATION
A. WASTEWATER TREATMENT PLANT FLOW INFORMATION—COMPLETE FOR NEW OR
EXPANDING FACILITIES
1. Provide the following flow information:
Plant Flows
Existing Plant Design n/a MGD
Current NPDES Permit Limit n/a MGD
Current Annual Average n/a MGD
(past 12 months)
For Past 12 Months: For Past 24 Months:
Start Date: n/a Start Date: n/a
End Date: n/a End Date: n/a
Maximum Month n/a MOD n/a MOD
Maximum Day n/a MGD n/a MGD
Peak Hour n/a MGD n/a MGD
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 5

State of North Carolina
DWR Department of Environmental Quality
Division of Water Resources
Division of Water Resources APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
B. WASTEWATER TREATMENT FACILITY DESIGN INFORMATION—COMPLETE FOR NEW OR
EXPANDING FACILITIES AND FOR TREATMENT PROCESS MODIFICATIONS
1. Have all of the requirements of 15 NCAC 02H.0100, I5A NCAC 02T,North Carolina General Statute 133-3,North
Carolina General Statute 143-215.1,and Division of Water Resources Minimum Design Criteria for NPDES Wastewater
Treatment Facilities been met by the proposed design and specifications?®Yes or❑No. If no,provide justification as to
why the requirements are not met,consistent with I5A NCAC 02T.0105(n):
2. Provide the design influent and effluent characteristics that are used as the basis for the project design,and the NPDES
permit limits for the following parameters: Not Applicable to this project
Project Basis of Design
Influent Design Influent Design Influent
Concentration Concentration Load
-Current (Must be (Must be
Annual supported by supported by Design Effluent
Average(past Engineering Engineering Concentration and/or NPDES Permit Limits
12 months)if Calculations Calculations Load (monthly average)
Parameter Available [Section 3.HI) [Section 3.H1)
Ammonia Nitrogen mg/L Summer mg/L Summer
(NH3-N) mg/L mg/L lb/day
mg/L Winter mg/L Winter
Biochemical mg/L Summer mg/L Summer
Oxygen Demand mg/L mg/L lb/day
(BOD3) mg/L Winter mg/L Winter
Fecal Coliform per 100 mL per 100 mL
Nitrate+Nitrite
Nitrogen(NO3-N+ mg/L mg/I,
NO2-N)
Total Kjeldahl mg/L
Nitrogen
mg/L mg/L
Total Nitrogen
lb/year lb/year
mg/L mg/L
Total Phosphorus mg/L mg/L lb/day
lb/year lb/year
Total Suspended mg/L mg/L lb/day mg/L mg/L
Solids(TSS)
3. Based on the"Project Basis of Design"parameters listed above,will the proposed design allow the treatment facility to meet
the NPDES Permit Limits listed above?❑Yes or❑No. If no,describe how and why the Permit Limits will not be met:
Not Applicable-design does not impact facility's ability to meet permit limits.
4. Per 15A NCAC 02T.0505(j),by-pass and overflow lines are prohibited. Is this condition met by the design?®Yes or❑
No If no,describe the treatment units bypassed,why this is necessary,and where the bypass discharges:
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 6

State of North Carolina
DWR Department of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
5. Per I 5A NCAC 02T.0505(k),multiple pumps shall be provided wherever pum
ps are used.Is this condition met by the
design?❑ Yes or®No. If no,provide an explanation: No pumps included in this permit. Pumps to be permitted under
fast track sewer permit with force mains.
6. Per 15A NCAC 02T.0505(1),power reliability shall be provided consisting of automatically activated standby power supply
onsite capable of powering all essential treatment units under design conditions,or dual power supply shall be provided per
15A NCAC 02H.0124(2)(a). Is this condition met by the design? ®Yes or❑No. If no,provide(as an attachment to
this Application)written approval from the Director that the facility:
➢ Has a private water supply that automatically shuts off during power failures and does not contain elevated water storage
tanks,and
➢ Has sufficient storage capacity that no potential for overflow exists,and See statement at bottom of page
> Can tolerate septic wastewater due to prolonged detention.
7. Per I5A NCAC 02T.0505(o),a minimum of 30 days of residual storage shall be provided. Is this condition met by the
design? ® Yes or❑No. If no,explain the alternative design criteria proposed for this project in accordance I5A NCAC
02T.105(n):
8. Per 15A NCAC 02T.0505(q),the public shall be prohibited from access to the wastewater treatment facilities. Explain how
the design complies with this requirement: There will be full fencing around the site,as well as security cameras and gate
with keypad at the entrance.
9. Is the treatment facility located within the 100-year flood plain? ❑Yes or®No. If yes,describe how the facility is
protected from the 100-year flood:
C. WASTEWATER TREATMENT UNIT AND MECHANICALEQUIPMENT INFORMATION—COMPLETE
FOR NEW OR EXPANDING FACILITIES AND FOR MODIFIED TREATMENT UNITS
I. PRELIMINARY AND PRIMARY TREATMENT(i.e.,physical removal operations and flow equalization):
No.of Plan Sheet Specification Calculations
Treatment Unit Units Type Size per Unit Reference Reference Provided?
(Yes or No
Manual Bar Screen MGD at peak hourly flow
Mechanical Bar MGD at peak hourly flow
Screen
Grit Removal MGD at peak hourly
flow
Flow Equalization '- gallons
Primary Clarifier Circular ft diameter; ft side
water depth
Primary Clarifier Rectangular square feet; ft side
water depth
Other
► During a power outage, sludge pumping will be halted and PS and WAS will be stored in the Solids
Storage Tanks. PS and WAS can be held for up to 20 hours at the plant capacity of 15 mgd. Power for
the Stowe RWRRF is provided off Duke Energy transmission lines, so the power source is very reliable.
Power outages are anticipated to be infrequent and power is expected to be restored within 18 hours.
The Stowe RWRRF will have two emergency standby generators with a total capacity of 6000 kW.
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 7

State of North Carolina
DWRDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
2. SECONDARY TREATMENT(BIOLOGICAL REACTORS AND CLARIFIERS)(i.e., biological and chemical
processes to remove organics and nutrients)
No. of Plan Sheet Specification Calculations
Treatment Unit Units Type Size per Unit Reference Reference Provided?
(Yes or No)
Aerobic Zones/
Tanks gallons
Anoxic Zones/
Tanks gallons
Anaerobic
Zones/Tanks gallons
Sequencing Batch
Reactor(SBR) -" gallons
Membrane
Bioreactor(MBR) -- gallons
Secondary Clarifier Circular ft diameter; ft side
water depth
Secondary Clarifier Rectangular square feet; ft side
water depth
Other
3. TERTIARY TREATMENT
No.of Plan Sheet Specification Calculations
Treatment Unit Units Type Size per Unit Reference Reference Provided?
(Yes or No)
Tertiary Clarifier Circular ft diameter; ft side
water depth
Tertiary Clarifier Rectangular square feet; ft side
water depth
Tertiary Filter square feet
Tertiary Membrane
Filtration square feet
Post-Treatment
Flow Equalization -- gallons
Post-Aeration gallons
Other
4. DISINFECTION
No.of Plan Sheet Specification Calculations
Treatment Unit Units Type Size per Unit Reference Reference Provided?
(Yes or No)
gal/day per bank at peak
Ultraviolet Light (Parallel; in hourly flow; number of
banks; number of
series) lamps/bank
Chlorination (Gas; gallons of contact
tablet;liquid) tank/unit
Dechlorination (Gas; gallons of contact
tablet; liquid) tank/unit
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 8

State of North Carolina
DW RDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
5. RESIDUALS TREATMENT
No.of Plan Sheet Specification Calculations
Treatment Unit Units Type Size per Unit Reference Reference Provided?
(Yes or No)
Gravity Thickening square feet; ft side
Tank water depth
Mechanical
Thickening/ dry lb/hour
Dewatering
Aerobic Digestion gallons
Anaerobic
Digestion gallons
Composting dry lb/hour
Drying dry lb/hour
2 Solids Screen 440 gpm @ 1%solids M-5 462160 N/A
Other 2 Solids Storage 2,209 square feet; 18 ft side M-2 033000 Yes
Tank water depth
1 6. PUMP SYSTEMS(include influent, intermediate,effluent,major recycles,waste sludge,thickened waste sludge and plant
drain pumps)
Capacity
Location No.of Purpose Type of each Plan Sheet Specification
Pumps pump Reference Reference
GPM TDH
7. MIXERS
No.of Power of Plan Sheet Specification
Location Mixers Purpose Type eac� ixe Reference Reference
HP)
WAS Storage Tank Mix and maintain
No. 1 1 solids suspension Submersible 8.3 M-2 464123
Primary Solids I Mix and maintain Submersible 12.1 M-2 464123
Storage Tank No. 1 solids suspension
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 9

State of North Carolina
DW RDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
8. BLOWERS
No. of Capacity of Plan Sheet Specification
Location Blowers Purpose Type ea(C Blower Reference Reference
9. ODOR CONTROL
Location No. of Purpose Type I Plan Sheet Specification
Units l Reference Reference
1iotrickling Filter or Bioscrubber
including two(2)blowers, one(1)
Provide Odor biotrickling filter/bioscrubber
Control for vessel,two(2)recirculation pumps
screenings room (temporary installation for 443133,
Odor Control Slab I with dumps er
room
and biotrickling filters and permanent M-2,M-9, 233116,
proposed as well installation for bioscrubbers),one M-10,&H-2 233113,&
future PS and WAS (1)nutrient feed tank,one(1) 431119
tanks nutrient feed pump,interconnecting
ductwork from foul air sources to
vessel exit,and all associated
system appurtenances.
D. SETBACKS—COMPLETE FOR NEW WASTEWATER TREATMENT STRUCTURES
1. The minimum distance for each setback parameter to the wastewater treatment/storage units per 15A NCAC 02T.0506(b)are
as follows:
Minimum Distance Is Minimum Distance
Required from Nearest Requirement met by the
Setback Parameter Treatment/Storage Design?If"No",identify
Unit Setback Waivers in Item D.2
Below
Any habitable residence or place of assembly under separate 100 ft ®Yes ❑ No
ownership or not to be maintained as part of the project site
Any private or public water supply source 100 ft ®Yes ❑ No
Surface waters(streams—intermittent and perennial,perennial 50 ft ® Yes ❑ No
waterbodies,and wetlands)
Any well with exception of monitoring wells 100 ft ®Yes ❑No
Any property line 50 ft ® Yes ❑No
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 10

State of North Carolina
DWR Department of Environmental Quality
Division of Water Resources
Division of Water Resources APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
2. Have any setback waivers been obtained per I5A NCAC 02T .0506(d)? ❑ Yes or® No. If yes, have these waivers been
written, notarized and signed by all parties involved and recorded with the County Register of Deeds? ❑ Yes or 0 No. If
no,provide an explanation:_
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page I l

State of North Carolina
DW R Department of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
SECTION 5: APPLICATION CERTIFICATION BY PROFESSIONAL ENGINEER
Professional Engineer's Certification per 15A NCAC 02T.0105:
I, Laurin Kennedy ,attest that this application package for an Authorization to Construct
(Typed Name of Professional Engineer)
for the Charlotte Water Stowe RWRRF Regional Solids Conveyance Phase IA—Package 2
(Facility and Project Name)
was prepared under my direct supervisory control and to the best of my knowledge is accurate,complete and consistent
with the information supplied in the engineering plans, specifications,calculations, and all other supporting
documentation for this project. I further attest that to the best of my knowledge the proposed design has been prepared in
accordance with all applicable regulations and statutes, 15 NCAC 02H. 0100, 15A NCAC 02T,North Carolina General
Statute 133-3,North Carolina General Statute 143-215.1,and Division of Water Resources Minimum Design Criteria for
NPDES Wastewater Treatment Facilities, and this Authorization to Construct Permit Application,except as provided for
and explained in Section 4.B.I of this Application. I understand that the Division of Water Resources' issuance of the
Authorization to Construct Permit may he based solely upon this Certification and that the Division may waive the
technical review of the plans, specifications,calculations and other supporting documentation provided in this application
package. I further understand that the application package may be subject to a future audit by the Division. Although
certain portions of this submittal package may have been prepared, signed and sealed by other professionals licensed in
North Carolina, inclusion of these materials under my signature and seal signifies that I have reviewed the materials and
have determined that the materials are consistent with the project design.
I understand that in accordance with General Statutes 143-215.6A and 143-215.6B, any person who knowingly makes any
false statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor,which
may include a fine not to exceed $10,000,as well as civil penalties up to$25,000 per violation.
North Carolina Professional Engineer's seal with written signature placed over or adjacent to the seal and dated:
°�`;�N's....
grqk
SEAL
03077,E ••
•'�FNGINE�-' .,r�.
'r, , ....N.�\V IV \\\\
'IBIIIIEN \r`n B Kennedy
NC PE#030770
2023.10.23 13:22:51-04'00'
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 12

State of North Carolina
DWR Department of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
SECTION 6: APPLICATION CERTIFICATION BY APPLICANT
Applicant's Certification per 15A NCAC 02T.0106(b):
I, Joseph C. Wilson,Chief Engineer ,attest that this application package for an Authorization to Construct
(Typed Name of Signature Authority and Title)
for the Charlotte Water Stowe RWRRF Regional Solids Conveyance Phase lA-Package 2
(Facility and Project Name)
has been reviewed by me and is accurate and complete to the best of my knowledge. I also understand that if all required
parts of this application package are not completed and that if all required supporting information and attachments are not
included, this application package will be returned to me as incomplete. I further certify that in accordance with 15A
NCAC 02T.0120(6),the Applicant or any affiliate has not been convicted of environmental crimes,has not abandoned a
wastewater facility without proper closure,does not have an outstanding civil penalty where all appeals have been
abandoned or exhausted,are compliant with any active compliance schedule,and does not have any overdue annual fees.
I understand that the Division of Water Resources' issuance of the Authorization to Construct Permit may be based solely
upon acceptance of the Licensed Professional Engineer's Certification contained in Section 5,and that the Division may
waive the technical review of the plans, specifications,calculations and other supporting documentation provided in this
application package. I further understand that the application package may be subject to a future audit.
I understand that in accordance with General Statutes 143-215.6A and 143-215.6B any person who knowingly makes any
false statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor,which
may include a fi not exceed $10,000,as well as civil penalties up to$25,000 per violation.
Signature: Date: /D/.3/wL3
THE COMPLETED APPLICATION AND SUPPORTING INFORMATION SHALL BE SUBMITTED
TO:
NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES/NPDES
By U.S. Postal Service By Courier/Special Delivery:
1617 MAIL SERVICE CENTER 512 N. SALISBURY STREET, 9TH FLOOR
RALEIGH, NORTH CAROLINA 27699-1617 RALEIGH,NORTH CAROLINA 27604
TELEPHONE NUMBER: [phone]
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 13

SECTION 2
CI
0
1_,J
U
(1)

Permit NC0089630
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,
Charlotte Water
is hereby authorized to discharge wastewater from a facility located at the
Joe C. Stowe,Jr. Regional Water Resources Reclamation Facility
800 Hawfield Road,Charlotte
(Long Creek Pump Station Access)
Mecklenburg County
to receiving waters designated as the Catawba River 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 December 1,2019.
This permit and authorization to discharge shall expire at midnight on November 30,2024.
Signed this day November 4,2019.
Original signed by Julie A. Grzyb for
Linda Culpepper,Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0089630
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.
Charlotte Water
is hereby authorized to:
1. Upon receipt of an Authorization to Construct from the Division of Water Resources,construct and
operate Phase 1 of the Joe C.Stowe,Jr.Regional Water Resources Reclamation Facility,a 15.0 MGD
wastewater treatment facility to be located at 800 Hawfield Road,Charlotte,in Mecklenburg County;
and
2. Upon receipt of an Authorization to Construct from the Division of Water Resources,construct and
operate the Phase 2 expansion of the facility with a design flow of 25.0 MGD;and
3. Upon receipt of Authorizations to Operate from the Division of Water Resources as specified herein,
discharge treated wastewaters from said treatment works into the Catawba River,a Class WS IV,CA
water in the Catawba River Basin,at the location specified on the attached map.
ii

„,,, ( _.brx-,_N . . -...., ,z,-,,,,, „, , ,--7--___-:,...,,, , t-itt{,j, -- 1\\,..,:,,,,,;-:.‘,; ---'. ',;;`') -1,,,'clAtitia t'l ,ii...t7, ,S/ /2/ i;,/ ?\ \I
%' / A �'. t� City ; ; . .”— , .
..:..._icik144, , i.
r '•�� 9i Wa er" ) •
��`,,' `� � F •/ � i agtg ./ / n \�-\t
"4" 'r-- -----‘ '. ,`:---t . m, •-t-_.. ,41, --,,,k-c/P,t,',---.:, •-: ,---'-'---. •Iq., i ' v,55
, ,
�jE o I.
/ / ii9 (ji
Wj,;r Y
/(c
t �-�—ram-'" - ~_�:: rr 1 --
\ ubsta� y �I
�\�. /` �''' • WTI 0 d (I•, (t. • ') . rf
% `�\ , v `� 't , '', '/'
r Approximate
/
�_.'.._' � i �1� \-\_-,'�: ,�,`/• ;'; \ I
1 Plant Location i\
••/ �Ji r �--'✓ 2% ,\ \ ,�-t }i,,,. , / � l 35.28022, 81.00630 �\
f ‘� ' '� o/ ! f r I i 11 p
-16
(.i '- l'/' .\\-. , it,,/,,k,:lij , I/ --.. ...., i , -7' ' 600H
�J �=,_ ;68 3 , - S w a e � O Q? r
'�
-- , 11i. �`,
- (Moht Holly WWTP)i r 7 /-_, • 1'
/ ' /_
// �C1 ,r
I I ..---''NI-----
— IV /4" 0/ 1 __-,-\'-:':'-''• I' "7" /- ' • ., ,t,. --. %.,_
Tt > �` J /1 ��- `_ / Outfall 001 `!'��"�
N sr.y / 35.28029, 81.00839
.• tie , '1 662, / ,vo ft /a i Ex. Long Creek
to Orr\ i - __�- / 1 , .-/r t r Pump Station 1
� `
�\ } / \ \,, . ,__.,I % 35.27998,-81.00183
."-----7' {:.--- ././..., ,z2 , ._,...______/„1 '•,2 1,...; 1 V t.,, 1 '[ i\ \\ ..//-•..2%, -' . " --: "..,....* .
/' 47,3?' !.„1..,,..:L.,:::::::./.1,,(\.,J.,::,,, , .„ _;;;./ :, ,. \ , ; ;, ,,,./..,;:„........ _, ,,,,, 1,,., s„;,..\...,, ) ,..-- — ,-:,
r' I I \ �/ X65/ '
.�'STr ` ' '-' 1/./ ' �IL,c -- � ----` 1 1 /l 1 / /
Ave �--— C\ y :y ,r ''Lci '
1 i ` "-•.
! Charlotte Water —Joe C. Stowe, Jr. RWRRF
x
N NC0089630
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"=z000') Sub-Basin/8-Digit HUC#: 03-08-33/03050101
iii

Permit NC0089630
CONTENTS
PERMIT
PART I-MONITORING,CONTROLS,AND LIMITATIONS FOR PERMI ITFD DISCHARGES 1
A.(1.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS-15 MGD 1
A.(2.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS-25 MGD 2
A.(3.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 3
A.(4.)INSTREAM MONITORING REQUIREMENTS 4
A.(5.)CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT 5
A.(6.)EFFLUENT POLLUTANT SCAN AND SECOND-SPECIES TOXICITY TESTING 6
A.(7.)TOTAL NITROGEN AND TOTAL PHOSPHORUS LIMITS 7
A.(8.)NUTRIENT ALLOCATIONS 8
A.(9.)CALCULATION AND REPORTING OF TOTAL NITROGEN AND TOTAL PHOSPHORUS
LOADS 10
A.(10.)ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS 11
PART II-STANDARD CONDITIONS FOR NPDES PERMITS
PART III-OTHER REQUIREMENTS
PART IV-SPECIAL CONDITIONS FOR MUNICIPAL FACILITIES
iv

Permit NC0089630
PART I -MONITORING,CONTROLS,AND LIMITATIONS FOR PERMITTED DISCHARGES
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS -15 MGD
[15A NCAC 02B.0400 et seq.,02B.0500 et seq.] Grade IV Biological WPCS [15A NCAC 08G .0302]
(a.) During the period beginning on the effective date of this permit and conditioned upon submittal of
the engineer's certification of construction of the 15.0 MGD facility and receipt of an Authorization to
Operate per Condition A.(3.) of this permit,and lasting until expansion to 25.0 MGD capacity or until I
permit expiration,whichever is sooner,the Permittee is authorized to discharge treated wastewaters
from Outfall 001.Such discharges shall be limited and monitored by the Permittee as specified in this
condition and in Condition A.(3.):
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
PARAMETER
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location 1
Flow 50050 15.0 MGD Continuous Recording I or E
Total Monthly Flow(MG) 82220 Monitor and Report Monthly Recorded or I or E
Calculated
CBOD5 (Summer)2-3 80082 4.2 mg/L 6.3 mg/L Daily Composite I, E
CBOD5 (Winter)2'3 80082 8.3 mg/L 12.5 mg/L Daily Composite I, E
Total Suspended Solids 2 C0530 30 mg/L 45 mg/L Daily Composite I, E
NH3-N C0610 1.0 mg/L 3.0 mg/L Daily Composite E
Dissolved Oxygen 00300 Daily average >_ 6.0 mg/L Daily Grab E
Fecal Coliform(geometric mean) 31616 200/100 mL 400/100 mL Daily Grab E
Total Residual Chlorine 4 50060 28 pg/L Daily Grab E
pH 5 00400 >_ 6.0 and <_ 9.0 standard units Daily Grab E
Temperature(°C) ooioo Daily Grab E
TKN(mg/L) 00625 Monitor and Report Weekly Composite E
NO3-N + NO2-N (mg/L) 00630 Monitor and Report Weekly Composite E
Total Nitrogen (mg/L)6 C0600 Monitor and Report Weekly Composite E
TN Load 2 QM600 Monitor and Report(Ib/mo) Monthly Calculated E
Total Phosphorus(mg/L)6 C0665 Monitor and Report Weekly Composite E
TP Load 2 QM665 Monitor and Report(lb/mo) Monthly Calculated E
Total Hardness(mg/L as CaCO3)8 00900 Quarterly Composite E
Chronic Toxicity 8,10 TGP3B P/F at 19.7% Quarterly Composite E
Effluent Pollutant Scan ivc01 Monitor and Report Footnote 10 Footnote 10 E
Footnotes:
1. Sample locations:E=Effluent,I=Influent.
2. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value(i.e.,85%removal is required).
3. Summer is defined as April 1 -October 31.Winter is defined as November 1 -March 31.
4. TRC limits and monitoring requirements apply only if chlorine or chlorine derivatives are used for
disinfection. The Permittee shall report all effluent TRC values reported by a NC-certified laboratory
[including field-certified]. Effluent values below 50 µg/L will be treated as zero for compliance purposes.
5. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
6. Total Nitrogen(TN)is defined as NO3-N+NO2-N+TKN,where NO3-N is nitrate nitrogen,NO2-N is nitrite
nitrogen,and TKN is total Kjeldahl nitrogen.TP is Total Phosphorus.
7. See Condition A.(9.)regarding calculation and reporting of seasonal and annual mass loads.
8. Effluent hardness sampling should be performed in conjunction with testing for hardness dependent metals
(cadmium,copper,lead,nickel,silver,and zinc).
9. See condition A.(5.),Chronic Toxicity;tests performed during March,June,September,and December.
10. See Special Condition A.(6.) Effluent Pollutant Scan and Second-Species Toxicity Testing.
(b.) There shall be no discharge of floating solids or visible foam in other than trace amounts.
Part I,Page 1 of 12

Permit NC0089630
A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS -25 MGD
[15A NCAC 02B .0400 et seq.,02B.0500 et seq.] Grade IV Biological WPCS [15A NCAC 08G .0302]
(a.) Beginning upon expansion to 25.0 MGD capacity and conditioned upon submittal of the engineer's
certification of construction of the 25 MGD facility and receipt of an Authorization to Operate per
Condition A.(3.) of this permit,and lasting until permit expiration,the Permittee is authorized to
discharge treated wastewaters from Outfall 001. Such discharges shall be limited and monitored by
the Permittee as specified in this condition and in Condition A.(3.):
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
PARAMETER
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location 1
Flow 50050 25.0 MGD _ Continuous Recording I or E
Total Monthly Flow(MG) 82220 Monitor and Report Monthly Recorded or I or E
Calculated
CBOD5 (Summer)2-3 80082 4.2 mg/L 6.3 mg/L Daily Composite I, E
CBOD5 (Winter)2-3 80082 8.3 mg/L 12.5 mg/L Daily Composite I, E
Total Suspended Solids 2 C0530 30 mg/L 45 mg/L Daily Composite I, E
NH3-N C0610 1.0 mg/L 3.0 mg/L Daily Composite E
Dissolved Oxygen 00300 Daily average >_ 7.0 mg/L 4 Daily Grab E
•
Fecal Coliform(geometric mean) 31616 200/100 mL 400/100 mL Daily Grab E
Total Residual Chlorine 5 50060 28 pg/L Daily Grab E
pH 6 00400 >_ 6.0 and 5. 9.0 standard units Daily Grab E
Temperature(°C) moo Daily Grab E
TKN (mg/L) 00625 Monitor and Report Weekly Composite E
NO3-N + NO2-N(mg/L) 00630 Monitor and Report Weekly Composite E
Total Nitrogen (mg/L)' C0600 Monitor and Report Weekly Composite E
TN Load 8 QM600 Monitor and Report(lb/mo) Monthly Calculated E
Total Phosphorus(mg/L) ' C0665 Monitor and Report Weekly Composite E
TP Load 8 QM665 Monitor and Report(lb/mo) Monthly Calculated E
Total Hardness(mg/L as CaCO3)9 00900 Quarterly Composite E
Chronic Toxicity 10,11 TGP38 P/F at 29.0% Quarterly Composite E
Effluent Pollutant Scan NC01 Monitor and Report Footnote 11 Footnote 11 E
Footnotes:
1. Sample locations:E=Effluent,I=Influent.
2. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15%of the
respective influent value(i.e.,85%removal is required).
3. Summer is defined as April 1 -October 31.Winter is defined as November 1 -March 31.
4. The Division may lower the Dissolved Oxygen limit to as low as 6.0 mg/L without modification of this permit
provided that the Permittee further evaluates the potential impact of its Phase 2 discharge and demonstrates to
the Division's satisfaction that,at the full permitted flow and the lower D.O.limit concentration,the discharge
would not cause a violation of the D.O.surface water quality standard.
5. TRC limits and monitoring requirements apply only if chlorine or chlorine derivatives are used for
disinfection. The Permittee shall report all effluent TRC values reported by a NC-certified laboratory
[including field-certified]. Effluent values below 50 µg/L will be treated as zero for compliance purposes.
6. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
7. Total Nitrogen(TN)is defined as NO3-N+NO2-N+TKN,where NO3-N is nitrate nitrogen,NO2-N is nitrite
nitrogen,and TKN is total Kjeldahl nitrogen.TP is Total Phosphorus.
8. See Condition A.(9.)regarding calculation and reporting of seasonal and annual mass loads.
9. Effluent hardness sampling should be performed in conjunction with testing for hardness dependent metals
(cadmium,copper,lead,nickel,silver,and zinc).
10. See condition A.(5.),Chronic Toxicity;tests performed during March,June,September,and December.
11. See Special Condition A.(6.) Effluent Pollutant Scan and Second-Species Toxicity Testing.
Part I,Page 2 of 12

Permit NC0089630
(b.) There shall be no discharge of floating solids or visible foam in other than trace amounts.
A.(3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B.0400 et seq.,02B.0500 et seq.] Grade IV Biological WPCS[15A NCAC 08G.0302]
(a.) During the period beginning on the effective date of this permit and lasting until receipt of an
Authorization to Operate in accordance with paragraph(c.), (d.),or(e.) of this Condition or until
permit expiration,whichever is sooner,the Permittee shall not discharge wastes to surface waters of
the state.
(b.) The Permittee shall notify the Division in writing of the intended date of connection of the City of
Belmont wastewater collection system and the intended date of connection of the City of Mount Holly
wastewater collection system to the Joe Stowe,Jr.Regional WRRF no later in each case than 60 days
prior to the intended date of connection.
(c.) Mount Holly connection.During the period beginning upon connection of Mount Holly and receipt of
an Authorization to Operate and lasting until connection of Belmont or permit expiration,whichever
is sooner,the Permittee is authorized to discharge treated wastewaters from Outfall 001.Such
discharges shall be limited and monitored by the Permittee as specified below and in Condition A.(1.)
[15.0 MGD]or A.(2.) [25.0 MGD]of this permit,whichever is effective:
PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location
TN Load 2 3 QS600 111,973 lb/summer Seasonally Calculated E
QS600 124,345 lb/winter Seasonally Calculated
TP Load 3 QY665 31,405 lb/yr Annually Calculated E
Footnotes:
1. Sample locations:E=Effluent,I=Influent.
2. Summer is defined as April 1-October 31.Winter is defined as November 1-March 31.
3. See Condition A.(9.)regarding calculation and reporting of seasonal and annual mass loads.
(d.) Belmont connection.During the period beginning upon connection of Belmont and receipt of an
Authorization to Operate and lasting until connection of Mount Holly or permit expiration,whichever
is sooner,the Permittee is authorized to discharge treated wastewaters from Outfall 001.Such
discharges shall be limited and monitored by the Permittee as specified below and in Condition A.(1.)
[15.0 MGD]or A.(2.) [25.0 MGD]of this permit,whichever is effective:
PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location 1
TN Load 2,3 QS600 88,656 lb/summer Seasonally Calculated E
Q5600 115,449 lb/winter Seasonally Calculated
TP Load 3 QY665 21,309 lb/yr Annually Calculated E
Footnotes:
1. Sample locations:E=Effluent,I=Influent.
2. Summer is defined as April 1-October 31.Winter is defined as November 1-March 31.
3. See Condition A.(9.)regarding calculation and reporting of seasonal and annual mass loads.
(e.) Mount Holly and Belmont connections-15.0 MGD.During the period beginning upon connection of
both Mount Holly and Belmont and receipt of an Authorization to Operate and lasting until permit
expiration or expansion to 25.0 MGD capacity,whichever is sooner,the Permittee is authorized to
discharge treated wastewaters from Outfall 001 in accordance with the terms and conditions in this
Part I,Page 3 of 12

Permit NC0089630
paragraph and in Condition A.(1.)of this permit:
PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location 1
TN Load 2,3 Q5600 160,628 lb/summer Seasonally Calculated E
Q5600 226,681 lb/winter Seasonally Calculated
TP Load 3 QY665 45,662 lb/yr Annually Calculated E
Footnotes:
1. Sample locations:E=Effluent,I=Influent.
2. Summer is defined 910.)regarding calculation and reporting of seasonal and annual mass loads.
(f.) Mount Holly and Belmont connections-25.0 MGD.During the period beginning upon expansion to
25.0 MGD capacity,connection of both Mount Holly and Belmont,and receipt of an Authorization to
Operate and lasting until permit expiration,the Permittee is authorized to discharge treated
wastewaters from Outfall 001 in accordance with the terms and conditions in this paragraph and in
Condition A.(2.)of this permit::
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
PARAMETER
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location 1
TN Load 2,3 Q5600 200,629 lb/summer Seasonally Calculated E
QS600 239,794 lb/winter Seasonally Calculated
TP Load3 QY665 52,713 lb/yr Annually Calculated E
Footnotes:
1. Sample locations:E=Effluent,I=Influent.
2. Summer is defined as April 1-October 31.Winter is defined as November 1-March 31.
3. See Condition A.(9.)regarding calculation and reporting of seasonal and annual mass loads.
A.(4.) INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B.0500 et seq.]
During the period beginning on submittal of the engineer's certification of construction of the 15.0 MGD
facility and lasting until expiration,the Permittee shall conduct instream monitoring as specified below:
PARAMETER FREQUENCY SAMPLE SAMPLING
TYPE LOCATIONI
Dissolved Oxygen(mg/L) Footnote 2 Grab U &D
Temperature(°C) Footnote 2 Grab U&D
Conductivity(pmho/cm) Footnote 2 Grab U&D
pH(S.U.) Footnote 2 Grab U&D
Total Nitrogen(mg/L) Footnote 2 Grab U&D
Total Phosphorus(mg/L) Footnote 2 Grab U&D
Hardness(mg/L as CaCO3) Quarterly Grab U
Footnote:
1. U=upstream at NC Highway 27 bridge. D=downstream at I-85.Upon written request and justification by the
Permittee,the Division may,without further review,modify this permit to move these sampling locations to
other representative locations.
2. Instream samples shall be grab samples taken 3/week(June-September)and 1/week(October-May).
Part I,Page 4 of 12

Permit NC0089630
A.(5.) CHRONIC TOXICITY PERMIT LIMIT
[15A NCAC 02B .0200]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality
to Ceriodaphnia dubia at an effluent concentration of 19.7%(15.0 MGD)or 29.0%(25.0 MGD).
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 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:
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.
Part I,Page 5 of 12

Permit NC0089630
A.(6.) EFFLUENT POLLUTANT SCAN AND SECOND-SPECIES TOXICITY TESTING
[G.S.143-215.1(b)]
(a.) Effluent Scans.In each of the first three years of discharge from this facility,the Permittee shall
perform an Effluent Pollutant Scan for allparameters listed below.Analytical methods shall be in
Y
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.,not
collected 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-ethyihexyl)phthalate
Nitrate/Nitrite 1,3-dichloropropylene 4-bromophenyl phenyl ether
Kjeldahl 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 1,1,2,2-tetrachloroethane Di-n-butyl phthalate
Antimony Tetrachloroethylene Di-n-octyl phthalate
Arsenic Toluene Dibenzo(a,h)anthracene
Beryllium 1,1,1-trichloroethane 1,2-dichlorobenzene
Cadmium 1,1,2-trichloroethane 1,3-dichlorobenzene
Chromium Trichloroethylene 1,4-dichlorobenzene
Copper Vinyl chloride 3,3-dichlorobenzidine
Lead Acid-extractable compounds: Diethyl phthalate
Mercury(EPA Method 1631E) P-chloro-m-cresol Dimethyl phthalate
Nickel 2-chlorophenol 2,4-dinitrotoluene
Selenium 2,4-dichlorophenol 2,6-dinitrotoluene
Silver 2,4-dimethylphenol 1,2-diphenyihydrazine
Thallium 4,6-dinitro-o-cresol Fluoranthene
Zinc 2,4-dinitrophenol Fluorene
Cyanide 2-nitrophenol Hexachlorobenzene
Total phenolic compounds 4-nitrophenol Hexachlorobutadiene
Volatile organic compounds: Pentachlorophenol Hexachlorocyclo-pentadiene
Acrolein Phenol Hexachloroethane
Acrylonitrile 2,4,6-trichlorophenol Indeno(1,2,3-cd)pyrene
Benzene Base-neutral compounds: 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-chloroethylvinyl ether Benzo(a)pyrene Phenanthrene
Chloroform 3,4 benzofluoranthene Pyrene
Dichlorobromomethane Benzo(ghi)perylene 1,2,4-trichlorobenzene
1,1-dichioroethane Benzo(k)fluoranthene
1,2-dichloroethane Bis(2-chioroethoxy)methane
(b.) Reporting of Scan Results. No later than December 31st of each designated sampling year,the
Permittee shall report the year's test results on its electronic Discharge Monitoring Report for the
sampling date,on DWR Form-A MR-PPA1,or in a form approved by the Director.Printed reports,if
used,shall be submitted to the following address:
NC DEQ/ DWR/ Water Quality Permitting Section
Attn: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
Part I,Page 6 of 12

Permit NC0089630
(c.) Second-Species Toxicity Testing.
(i.) In the four-and-one-half year period prior to application for permit renewal,the Permittee shall
conduct four(4)whole effluent toxicity tests for a second species of test organism in addition to
the tests and species specified in the Chronic Toxicity condition of this permit.
(ii.) The second-species tests shall be conducted either quarterly for a 12-month period or annually
and shall be performed as specified in the Chronic Toxicity condition of this permit.
(d.) Reporting of Toxicity Test Results.
(i.) The multiple species toxicity test results shall be filed with the Aquatic Toxicology Branch at the
following address:
NC DEQ/DWR/ Water Sciences Section
Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
NOTE: The Aquatic Toxicology Branch(919-743-8401)can provide guidance on conducting the
additional toxicity tests and reporting requirements.
(ii.) Results shall also be summarized in Part E(Toxicity Testing Data)of Application Form 2A when
applying for renewal of this NPDES permit.
A.(7.) 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 October 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.
(i.) 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:
NCDEQ/ DWR/ NPDES Programs
Attn:Nutrient Coordinator
1617 Mail Service Center
Raleigh,NC 27699-1617
Part I,Page 7 of 12

Permit NC0089630
A.(8.) NUTRIENT ALLOCATIONS
[G.S. 143-215.1(B)]
(a.) The following tables list the Total Nitrogen (TN)and Total Phosphorus (TP) allocations 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.The allocations in this table are not enforceable
limits nor do they supersede any TN limit(s) established elsewhere in this permit.
(b.) The tables in this paragraph list the allocations held by the Permittee and show their status at permit
issuance.These tables apply until the Permittee is authorized to discharge per Condition A.(3.)(c.),
(d.),or(e.).Summer is defined as April 1 -October 31,winter is defined as November 1 -March 31,
and Annual means on a calendar year basis,January 1 -December 31.
Total Nitrogen Allocation at Permit Issuance
ALLOCATION ALLOCATION ALLOCATION
TYPE SOURCE DATE SUMMER WINTER STATUS
(LB/SEASON) (LB/SEASON)
Supplemental Purchase from Clariant Corp. 12/12/2012 61,418 43,337 —
(NC0004375)
Decremental Transfer by agreement to 5/3/2018 -47,722 -33,673 Deducted
Mount Holly(NC0021156)
Decremental Transfer by agreement to 5/3/2018 -13,696 -9,664 Deducted
Belmont(NC0021181)
Total Allocation 0 0 —
Total Phosphorus Allocation at Permit Issuance
ALLOCATION ALLOCATION
TYPE SOURCE DATE ANNUAL STATUS
(LB/YEAR)
Supplemental Purchase from Clariant 12/12/2012 13,140 —
Corp. (NC0004375)
Decremental Transfer by agreement to 5/3/2018 -13,140 Deducted
Mount Holly(NC0021156)
Total Allocation 0 —
(c.) Mount Holly connection.The tables in this paragraph list the allocations to be held by the Permittee
upon connection of the City of Mount Holly collection system to the Joe Stowe,Jr. Regional WRRF and
apply while the Permittee's discharge is subject to Condition A.(3.)(c.) of this permit.
Total Nitrogen Allocation-Mount Holly Connection
ALLOCATION ALLOCATION ALLOCATION
TYPE SOURCE DATE SUMMER WINTER STATUS
(LB/SEASON) (LB/SEASON)
Supplemental Return transfer by agreement 12/12/2012 47,722 33,673 Active
from Mount Holly(NC0021156)
Supplemental Transfer by agreement from 5/3/2018 64,251 90,672 Active
Mount Holly(NC0021156)
Total Allocation 111,973 124,345 Active
Part I,Page 8 of 12

Permit NC0089630
Total Phosphorus Allocation-Mount Holly Connection
ALLOCATION ALLOCATION
TYPE SOURCE DATE ANNUAL STATUS
(LB/YEAR)
Supplemental Return transfer by agreement 12/12/2012 13,140 Active
from Mount Holly(NC0021156)
Supplemental Transfer by agreement from 5/3/2018 18,265 Active
Mount Holly(NC0021156)
Total Allocation 31,405 Active
(d.) Belmont connection.The tables in this paragraph list the allocations to be held by the Permittee upon
connection of the City of Belmont collection system to the Joe Stowe,Jr.Regional WRRF and apply
while the Permittee's discharge is subject to Condition A.(3.)(d.) of this permit.
Total Nitrogen Allocation-Belmont Connection
ALLOCATION ALLOCATION ALLOCATION
TYPE SOURCE DATE SUMMER WINTER STATUS
(LB/SEASON) (LB/SEASON)
Return transfer by
Supplemental agreement from Belmont 12/12/2012 13,696 9,664 Active
(NC0021181)
Supplemental Transfer by agreement from 5/3/2018 74,960 105,785 Active
Belmont(NC0021181)
Total Allocation 88,656 115,449 Active
Total Phosphorus Allocation—Belmont Connection
ALLOCATION ALLOCATION
TYPE SOURCE DATE ANNUAL STATUS
(LB/YEAR)
Supplemental Transfer by agreement from 5/3/2018 21,309 Active
Belmont(NC0021181)
Total Allocation 21,309 Active
(e.) Mount Holly and Belmont connections-15.0 MGD and 25.0 MGD.The tables in this paragraph list
the allocations to be held by the Permittee upon connection of both the City of Belmont and the City of
Mount Holly collection systems to the Joe Stowe,Jr.Regional WRRF and apply while the Permittee's
discharge is subject to Conditions A.(1.) (15.0 MGD) and A.(3.)(e.) or to Conditions A.(2.) (25.0 MGD)
and A.(3.)(f.) of this permit.
Total Nitrogen Allocation-Mount Holly and Belmont Connections
ALLOCATION ALLOCATION ALLOCATION
SOURCE DATE SUMMER WINTER STATUS
TYPE
(LB/SEASON) (LB/SEASON)
Return transfer by agreement
Supplemental from Mount Holly 12/12/2012 47,722 33,673 Active
(NC0021156)
Supplemental Return transfer by agreement from Belmont(NC0021181) 12/12/2012 13,696 9,664 Active
Supplemental Transfer by agreement from 5/3/2018 64,251 90,672 Active
Mount Holly(NC0021156)
Part I,Page 9 of 12

Permit NC0089630
ALLOCATION ALLOCATION ALLOCATION
TYPESOURCE DATE SUMMER WINTER STATUS
(LB/SEASON) (LB/SEASON)
Supplemental Transfer by agreement from 5/3/2018 74,960 105,785 Active
Belmont(NC0021181)
Total Allocation at 25 MGD(Condition A.(1.)) 200,629 239,794 Active
Total Allocation at 15 MGD(Condition A.(2.)) 160,628 226,681 Active
Reserve Allocation at 15 MGD 1 40,001 13,113 Reserve
1. Active allocations are capped at 6.0 mg/L summer and 12.0 mg/L winter;remainder is held in reserve.
Total Phosphorus Allocation-Mount Holly and Belmont Connections
ALLOCATION ALLOCATION
TY SOURCE DATE ANNUAL STATUS
PE
(LB/YEAR)
Supplemental Transfer by agreement from 5/3/2018 21,309 Active
Belmont(NC0021181)
Supplemental Return transfer by agreement 12/12/2012 13,140 Active
from Mount Holly(NC0021156)
Supplemental Transfer by agreement to 5/3/2018 18,265 Active
Mount Holly(NC0021156)
Total Allocation at 25 MGD(Condition A.(1.)) 52,7131 Active
Total Allocation at 15 MGD(Condition A.(2.)) 45,662 Active
Reserve Allocation at 15 MGD 2 7,052 Reserve
1. The sum differs from the expected value due to rounding of the individual values.
2. Active allocation is capped at 1.0 mg/L;remainder is held in reserve.
(f.) 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.(9.) 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 mass loads for TN and TP 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/season)=Sum of the Monthly TN Loads for April-October.
(iii.) Winter TN Load(lb/season)=Sum of the Monthly TN Loads for November-March.
(iv.) Annual TP Load(lb/year)=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
Part I,Page 10 of 12

Permit NC0089630
of this permit and shall be subject to the public review process afforded such modifications under
state and federal rules.
A.(10.) 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.The final NPDES Electronic Reporting Rule 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 Part II,Section D.(2.)and Section E.(5.)(a)1
StartinThe permittee shall report discharge monitoring data electrnically 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 state's 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
A 1T1NTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically located in an area where less than 10 percent of the households have broadband access,
then a temporary waiver from the NPDES electronic reporting requirements may be granted and
discharge monitoring data may be submitted on paper DMR forms(MR 1,1.1,2,3)or alternative forms
approved by the Director. Duplicate signed copies shall be submitted to the mailing address above. 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.
ontte 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 122.41(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.
Part I,Page 11 of 12

Permit NC0089630
A.(10.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS (cont.)
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 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 Part II,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 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 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/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.lam aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations."
5. Records Retention[Supplements Part II,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].
Part I,Page 12 of 12

SECTION 3
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0
I i
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RECORD OF DECISION
ENVIRONMENTAL IMPACT STATEMENT(EIS)
CHARLOTTE-MECKLENBURG UTILITIES/CITY OF MOUNT HOLLY REGIONAL
WASTEWATER TREATMENT
CHARLOTTE-MECKLENBURG UTILITIES/CITY OF MOUNT HOLLY
MECKLENBURG AND GASTON COUNTIES,NORTH CAROLINA
DWR#I603; DENR#1597
PREPARED BY:
NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
March 18, 2015
CONTACT PERSON:
DAVID WAINWRIGHT
NCDENR, Division of Water Resources
Mail Service Center 1617
Raleigh,NC 27604-1617
[phone]
[e-mail]

Record of Decision—Charlotte-Mecklenburg Utilities/City of Mount Holly Regional Wastewater Treatment
SUMMARY
An EIS has been prepared for the Charlotte-Mecklenburg Utilities Department(CMUD)and the planned
wastewater treatment expansion for the existing service area as well as surrounding service areas. The
proposal considers wastewater treatment at a regional level and includes the City of Mount Holly,the
City of Belmont,Clariant Corporation(Clariant),and CMUD's western Mecklenburg County wastewater
service area.A feasibility study was performed in 2006 for CMUD and the City of Mount Holly to
identify potential alternatives to meet the needs of the projected growth in the service areas. Study results
recommended a regional approach,and that is what is being pursued by CMUD and the City of Mount
Holly. As discussed in the EIS,there has been extensive stakeholder involvement with the public and
private sector as well as government officials throughout project development.
The preferred alternative would include constructing a new Wastewater Treatment Plant(WWTP)facility
on the Mecklenburg County side of the Catawba River on land near the existing Long Creek pump
station.The new facility would treat wastewater from both CMUD and the City of Mount Holly. Flows
from the City of Mount Holly and the City of Belmont would be pumped under the Catawba River to the
new facility.A new forcemain would be constructed from the City of Belmont WWTP to the Paw Creek
lift station.The existing Long Creek pump station would be modified to serve as the influent pumping
station for the new facility.
PURPOSE AND NEED
The purpose of the proposed project is to address future wastewater demands in northwestern
Mecklenburg and eastern Gaston Counties. Populations in in these areas are expected to grow
considerably by 2030. Population growth in the CMUD service area,which includes the Long Creek
Basin, Paw Creek Basin,Catawba Creek Basin,Gar Creek Basin,and the Lower Mountain Island Lake
Basin, is expected to increase from 43,371 in 2010 to 115,580 in 2030.Consequently,wastewater flows
in the service area is expected to increase from 6.44 million gallons per day(mgd) in 2010 to 14.74 mgd
in 2030. In order to meet the needs of these growing areas,without hindering growth,the wastewater
capacity of the region will need to be increased.
ALTERNATIVES ANALYSIS
Several alternatives were identified during the planning process.A total of seven alternatives were carried
forward and considered in the EIS;the EIS provides a full discussion of these alternatives. A brief
statement on each is below:
1. No Action: The No Action Alternative does not include construction of a new wastewater treatment
plant or other associated infrastructure. However,based on a NCDENR requirement,this alternative
would include upgrading the existing City of Mount Holly WWTP(Mount Holly WWTP)and City of
Belmont WWTP(Belmont WWTP). Wastewater from the Long Creek basin would continue to be
piped over 20 miles to the McAlpine Creek Wastewater Management Facility(WWMF).The Mount
Holly WWTP is approaching its maximum design capacity. Without expansion,areas not currently
serviced would likely have to utilize onsite septic systems.
2. Operate Separately with Existing and Upgraded Facilities(Alternative 1): With this alternative,
the existing Mount Holly WWTP would be upgraded to 8.0 mgd and would also be upgraded for
1

Record of Decision—Charlotte-Mecklenburg Utilities/City of Mount Holly Regional Wastewater Treatment
nutrient removal;the Belmont WWTP would be decommissioned and wastewater would then be
pumped across the Catawba River to a new pump station;wastewater from the Long Creek Basin in
Mecklenburg County would continue to be pumped and treated at the McAlpine Creek WWMF
and/or at the Irwin WWTP;wastewater from Clariant would continue to be treated by Clariant and
discharged to the Catawba River.Additionally,a force main would be constructed between the
Belmont WWTP and the Paw Creek lift station. Future collection system upgrades would be made to
enable transfer of projected future flows to the Irwin Creek WWTP via the Taggart Creek interceptor.
3. Operate Separately with Additional and Upgraded Facilities(Alternative 2): Under this
alternative,the City of Mount Holly and CMUD would continue to operate WWTPs separately.The
existing Mount Holly WWTP would be expanded and a new WWTP would be constructed at the
Long Creek site to accept flows from Mecklenburg County and Clariant.Additionally,the existing
Belmont WWTP would be decommissioned and a pump station built to pump wastewater across the
Catawba River to CMUD.A new forcemain from the Belmont WWTP to the Paw Creek lift station
would also be required. Wastewater from Clariant would be treated at the newly constructed Long
Creek WWTP,eliminating the need for the existing NPDES discharge.A portion of the wastewater
might be treated for reuse or reclaimed purposes such as landscape irrigation and industrial purposes.
4. Operate Jointly at Upgraded and Expanded Regional Mount Holly WWTP(Alternative 3): This
alternative includes expanding and upgrading the existing Mount Holly WWTP,which would accept
and treat all wastewater in the service area.The Belmont WWTP would be decommissioned and a
pump station built on the site along with a forcemain;wastewater would be pumped to CMUD for
treatment. Wastewater from the Long Creek Basin would be pumped across the Catawba River and
be treated at the Mount Holly Regional WWTP. A portion of the wastewater may be treated for reuse
or reclaimed purposes such as landscape irrigation and industrial purposes.
5. Operate Jointly at New Regional WWTP in Mount Holly(Alternative 4):This alternative
consists of constructing a new WWTP facility on land adjacent to the existing Mount Holly WWTP
site.This new plant would serve the City of Mount Holly as well as CMUD.The Belmont WWTP
would be decommissioned and replaced with a new pump station.A new forcemain would be
constructed from the Belmont WWTP to the Paw Creek lift station. Wastewater from Long Creek
would be pumped across the Catawba River to the new facility. A portion of the wastewater may be
treated for reuse or reclaimed purposes such as landscape irrigation and industrial purposes.
6. Operate Jointly at New Regional WWTP on Mecklenburg County Side(Alternative 5—
Preferred Alternative): Under this alternative,a new WWTP facility would be constructed on the
Mecklenburg County side of the Catawba River on land near the existing Long Creek pump station.
The new facility would treat wastewater from both CMUD and the City of Mount Holly. Flows from
the City of Mount Holly and/or City of Belmont would be pumped under the Catawba River to the
new facility.A new forcemain would be constructed from the Belmont WWTP to the Paw Creek lift
station.The existing Long Creek pump station would be modified to serve as the influent pumping
station for the new facility.A portion of the wastewater may be treated for reuse or reclaimed
purposes such as landscape irrigation and industrial purposes.
7. Combination of New and Existing Facilities(Alternative 6): With this alternative,the existing
Mount Holly WWTP would continue to operate under its existing capacity but would be upgraded to
meet nutrient permit limits.A new WWTP facility would be constructed adjacent to the existing Long
Creek pumping station.This new facility would accept additional flow from the Mount Holly WWTP
that exceeds the current capacity.A new forcemain would be constructed from the Belmont WWTP
to the Paw Creek lift station. The existing Long Creek pump station would be modified to serve as the
2

Record of Decision—Charlotte-Mecklenburg Utilities/City of Mount Holly Regional Wastewater Treatment
influent pump station for the new facility.A new pump station and additional infrastructure would be
constructed at the existing Mount Holly WWTP site allowing transfer of future wastewater to the new
facility. A portion of the wastewater may be treated for reuse or reclaimed purposes such as landscape
irrigation and industrial purposes.
8. Non-Discharee/Land Application Alternative: State law requires land application to be considered
for any WWTP.This option was found to be technically and economically infeasible due to the large
amount of land that would be required. Based on calculations,necessary land requirements would be
between 37 and 230 acres for non-discharge ponds and storage and between 1,000 acres and 13,000
acres for land application. In an urban setting these land requirements would be difficult to achieve
and the cost to purchase suitable land would be prohibitive.
PREFERED ALTERNATIVI
Alternative 5,operate jointly at a new regional WWTP on the Mecklenburg County side of the Catawba
River,was chosen as the preferred alternative.This alternative was selected over the others because it
meets the developing region's need for additional wastewater treatment capacity and results in a
combination of fewer negative environmental consequences.These include comparatively fewer natural
resource and environmental impacts at the building site; fewer construction and operational constraints;
greater public recreation and open space benefits;reduced energy use;increased water volume in Lake
Wylie for local uses such as power generation,cooling water, low flow supplementation,and drinking
water; and concurrence with the planning goals of the affected local governments.
Additionally,the placement of a single WWTP is preferable to other alternatives in terms of compatibility
with existing and future land uses, protection of riparian buffers,and reduced impacts to critical areas
such as streams and wetlands.Advanced treatment at a new facility would produce high quality effluent
with low nutrient concentrations and provide additional water into Lake Wylie for many beneficial uses.
The Preferred Alternative also provides regional wastewater treatment with a single discharge that
promotes efficient planning,design,and permitting; minimizes shoreline and wetland impacts; and cost-
effectively achieves project goals. It also has the potential to eliminate three existing discharges and
reduce the risk of overflows by reducing wastewater pumping distance.
ENVIRONMENTAL IMPACTS
All means of avoiding or minimizing environmental and cultural impacts outlined in the EIS will be
incorporated into the project. Moreover,the project will be designed and constructed to avoid adverse
impacts to existing environmental features as much as practicable.A summary of impacts to
environmental features and mitigative actions for the preferred alternative is described below:
Topography and soils:There will not be significant long-term impacts as a result of the project. Impacts
include those associated with leveling,excavation, and grading from construction of the project.The
preferred alternative would occur on land that has been previously disturbed. Impacts to soils and soil loss
would be controlled through the use of appropriate Best Management Practices(BMPS).
Land Cover and Land Use:The new facility constructed under the preferred alternative would be located
on land currently zoned industrial and the Belmont pump station and force main would be constructed on
3

Record of Decision—Charlotte-Mecklenburg Utilities/City of Mount Holly Regional Wastewater Treatment
previously disturbed land. With the preferred alternative,there would be approximately 80 acres of
undisturbed forested lands adjacent to the National Whitewater Center that could be used for public uses
such as greenways or other recreational activities.
Wetlands and Floodplains: Force mains would cross the Catawba River, Paw Creek,and Long Creek.
These crossings would be within the floodplain and associated wetland areas. Force mains and outfall
structure would be directionally bored,eliminating direct impacts to wetlands.The outfall would be
constructed within the Catawba River floodplain but will not result in an increase in the 100-year flood
base flood elevation.
Water Ouality: Impacts to surface waters include those from stormwater runoff,riparian buffer impacts,
and wastewater effluent. Increases in stormwater runoff may affect aquatic resources.The project will
require a Stormwater Pollution Prevention Plan(SWPPP);the included guidelines will minimize and
reduce the number and amount of pollutants leaving the site through BMPs. Riparian buffer areas may be
affected by force main and outfall crossings. Impacts to these areas will be minimized through the use of
directional boring under streams and associated riparian areas.Additionally,proposed facilities will be
located outside of riparian buffer areas. Wastewater discharge to Lake Wylie will increase. Compliance
with all NPDES permit limits will be required.
Ground Water:No direct impacts to groundwater are expected.
Water Supply: The proposed project will increase the amount of wastewater being discharged into Lake
Wylie.NPDES permit limits will protect the quality of water which will not exceed drinking water
standards.
Wildlife and Aquatic Resource Habitats: Impacts to terrestrial species is expected to be limited to those
areas that will be cleared; impacted wildlife may move to adjacent forested areas. Impacts to aquatic
species are expected to be minimal due to stormwater controls and stringent NPDES discharge limits.
Rare and Protected Species:The preferred alternative will not impact any rare or protected species.
Public,Scenic,and Recreational Areas: A portion of the proposed project is in close proximity to the
National Whitewater Center.The proposed alternative would preserve an 80 acre tract adjacent to the
National Whitewater Center which could be used to provide additional hiking and biking trails as well as
a new canoe launch on Long Creek. Potential adverse impacts include odors and wastewater spills,which
could result in disruption of recreational activities.New facilities would be designed to prevent storm-
flow bypasses and sanitary sewer overflows.Odor control technology would be incorporated into the
project as well.
Energy Resources: Energy consumption would increase as the new facility comes online,but usage would
partially be offset by not having to pump wastewater from Long Creek pumping station to McAlpine
in Lake Wylie could potentiallybe used for additional power
Creek WWTP. Additional water volume
Y
generation,and it may be possible to use onsite generated methane to partially power the facility and
reduce the consumption of natural gas.
Archeological or Historical Resources: There are no properties registered on the National Sate Register of
Historic Places. State Historic Preservation Office correspondence states that they will not require any
archeological surveys.
Prime Agricultural Lands: No prime agricultural lands will be affected by the proposed project.
4

Record of Decision—Charlotte-Mecklenburg Utilities/City of Mount Holly Regional Wastewater Treatment
Air Quality: Direct impacts to air quality will be temporary and minor. During construction,dust control
measures will be employed to limit dust exposure in the project area.Operation of the plant will not
produce any regulated air quality contaminants.Nearby residences and businesses would be buffered by
forested areas surrounding the facility. An air quality permit would be required for the operation of the
back-up generators and methane gas produced onsite would likely be used to generate power for the
facility.
Nuisance Conditions: Temporary noise and dust will be generated as result of construction. Odor control
measures would be used at the plant and pumping station. Most equipment would be housed in buildings
which will also help reduce noise and odors. A forested buffer around the facility will also help alleviate
potential noise and odor concerns.
Toxic Substances: Toxic substances will not be introduced during construction.All chemical storage and
feed areas at the plant would be provided with secondary containment.Onsite diesel fuel tanks for
generators will have secondary containment and leak detection systems.
SECONDARY AND CUMULATIVE IMPACTS
The secondary and cumulative impacts associated with the preferred alternative would generally be
related to continued urban growth and land use changes associated with population increases in the
service area. It is expected that population increases and associated secondary and cumulative impacts
would occur regardless of whether or not the proposed project is constructed.
The Gar and Catawba Sub-basins and portions of the Mountain Island Lake Sub-basin currently utilize
onsite septic tanks.The preferred alternative may allow these areas to be serviced with the wastewater
facility which would help eliminate the effects of failing septic sewer systems. If these areas were to be
serviced by the new facility, it would allow higher density development than what currently exists in
these areas.This may allow these areas to have more development due to higher density than would be
seen if the area remained on individual septic systems.Growth would continue in other areas of the
service areas as well. Several local and State regulations are in place throughout the project service area
that will minimize secondary and cumulative impacts and include various zoning restrictions,Water
Supply Watershed Protection areas,stormwater BMPS and regulations, riparian buffer rules,NPDES
permitting,floodplain protection ordnances,and municipal separate storm sewer systems(MS4). Public
sewer extension projects would be required to apply for and obtain the necessary permits and evaluate,
avoid,and minimize environmental impacts. Water supply watershed protection rules,which limit land
use densities and apply other development restrictions to protect water quality,apply to a large portion of
the project service area in both Gaston and Mecklenburg Counties.Additionally,a number of local
policies and ordinances are in place that would further limit secondary and cumulative impacts.
Beneficial impacts of the proposed project may also occur. By relocating the discharge point from Long
Creek to Lake Wylie,energy currently being used to pump wastewater 20 miles will be saved.The
additional discharge into Lake Wylie could be used to produce additional electricity. While some of the
treated effluent would be used onsite as reclaimed water,there exists the possibility that the reclaimed
water program could be expanded to include industrial and/or landscape applications,which could, in
turn,reduce the demand for treated drinking water during peak and drought conditions.
5

Record of Decision—Charlotte-Mecklenburg Utilities/City of Mount Holly Regional Wastewater Treatment
NECESSARY ACTIONS
It is anticipated that the project will require the following actions:
•NPDES Permit
• FERC Permit
•Air Quality Permit
• Dam Permit(for Equalization Basin embankment)
•401 Water Quality Certification
•404 Clean Water Act Permit
• Erosion Control Permit
• Mecklenburg County Building Permit
•Authorization to Construct
EIS REVIEW AND COMMENT
The EIS has been properly advertised and reviewed by State and Federal agencies. Extensive public input
has been made into the planning process. Comments from agencies and citizens have been incorporated
into the proposed project. A copy of this Record of Decision will be sent to the Clearinghouse,all review
agencies,and a notice of its availability will be published in the Environmental Bulletin.
(2.ti()VI-diiii.1 &V\
S.Jay Zimmerman ( at )
Director, Division of Water Resources
6

SECTION 4
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BID FORM
Regional Solids Conveyance Phase 1A—Package 2
Contract ITB#
Bidder Name:
Bid Date:
Charlotte Water -Page i- C-410,Bid Form Cover Page and Table of Contents
McAlpine Creek WWMF WAS EQ and Blending Facility Revised February 20,2018
and Odor Control Improvements

TABLE OF CONTENTS
Page
ARTICLE 1—Bid Recipient 3
ARTICLE 2—Bidder's Acknowledgements 3
ARTICLE 3—Bidder's Representations 3
ARTICLE 4—Bidder's Certification 4
ARTICLE 5—Basis of Bid 4
ARTICLE 6—Time of Completion 7
ARTICLE 7—Attachments to this Bid 7
ARTICLE 8—Defined Terms 7
ARTICLE 9—Bid Certification 8
Charlotte Water -Page ii- C-410,Bid Form Cover Page and Table of Contents
McAlpine Creek WWMF WAS EQ and Blending Facility Revised February 20,2018
and Odor Control Improvements

ARTICLE 1—BID RECIPIENT
1.01 This Bid is submitted to:
City of Charlotte-Charlotte Water
1.02 The undersigned Bidder proposes and agrees, if this Bid is accepted, to enter into a Contract
with Owner in the form included in the Bidding Documents to perform all Work as specified or
indicated in the Bidding Documents for the prices and within the times indicated in this Bid and
in accordance with the other terms and conditions of the Bidding Documents.
ARTICLE 2—BIDDER'S ACKNOWLEDGEMENTS
2.01 Bidder accepts all of the terms and conditions of the Instructions to Bidders, including without
limitation those dealing with the disposition of Bid security. This Bid will remain subject to
acceptance for 120 days after the Bid opening, or for such longer period of time that Bidder may
agree to in writing upon request of Owner.
ARTICLE 3—BIDDER'S REPRESENTATIONS
3.01 In submitting this Bid, Bidder represents that:
A. Bidder has examined and carefully studied the Bidding Documents, and any data and
reference items identified in the Bidding Documents, and hereby acknowledges receipt of
the following Addenda:
Addendum No. Addendum Date
B. Bidder has visited the Site, conducted a thorough, alert visual examination of the Site and
adjacent areas, and become familiar with and satisfied itself as to the general, local, and
Site conditions that may affect cost, progress,and performance of the Work.
C. Bidder is familiar with and has satisfied itself as to all Laws and Regulations that may affect
cost, progress, and performance of the Work.
D. Bidder has considered the information known to Bidder itself; information commonly
known to contractors doing business in the locality of the Site; information and
observations obtained from visits to the Site; the Bidding Documents; and any Site-related
reports and drawings identified in the Bidding Documents, with respect to the effect of
such information, observations, and documents on (1) the cost, progress, and performance
of the Work; (2) the means, methods, techniques, sequences, and procedures of
construction to be employed by Bidder; and (3) Bidder's safety precautions and programs.
E. Bidder agrees, based on the information and observations referred to in the preceding
paragraph, that no further examinations, investigations, explorations,tests, studies, or data
are necessary for the determination of this Bid for performance of the Work at the price bid
and within the times required, and in accordance with the other terms and conditions of
the Bidding Documents.
Charlotte Water -Page 3 of 10- C-410,Bid Form
McAlpine Creek WWMF WAS EQ and Blending Facility Revised February 20,2018
and Odor Control Improvements

F. Bidder is aware of the general nature of work to be performed by Owner and others at the
Site that relates to the Work as indicated in the Bidding Documents.
G. Bidder has given Engineer written notice of all conflicts, errors, ambiguities, or
discrepancies that Bidder has discovered in the Bidding Documents and confirms that the
written resolution thereof by Engineer is acceptable to Bidder.
H. The Bidding Documents are generally sufficient to indicate and convey understanding of all
terms and conditions for the performance and furnishing of the Work.
I. The submission of this Bid constitutes an incontrovertible representation by Bidder that
Bidder has complied with every requirement of this Article, and that without exception the
Bid and all prices in the Bid are premised upon performing and furnishing the Work
required by the Bidding Documents.
ARTICLE 4—BIDDER'S CERTIFICATION
4.01 Bidder certifies that:
A. This Bid is genuine and not made in the interest of or on behalf of any undisclosed
individual or entity and is not submitted in conformity with any collusive agreement or
rules of any group, association,organization, or corporation;
B. Bidder has not directly or indirectly induced or solicited any other Bidder to submit a false
or sham Bid;
C. Bidder has not solicited or induced any individual or entity to refrain from bidding; and
D. Bidder has not engaged in corrupt, fraudulent, collusive, or coercive practices in competing
for the Contract. For the purposes of this Paragraph 4.01.D:
1. "corrupt practice" means the offering, giving, receiving, or soliciting of any thing of
value likely to influence the action of a public official in the bidding process;
2. "fraudulent practice" means an intentional misrepresentation of facts made (a) to
influence the bidding process to the detriment of Owner, (b) to establish bid prices at
artificial non-competitive levels, or (c) to deprive Owner of the benefits of free and
open competition;
3. "collusive practice" means a scheme or arrangement between two or more Bidders,
with or without the knowledge of Owner, a purpose of which is to establish bid prices
at artificial, non-competitive levels; and
4. "coercive practice" means harming or threatening to harm, directly or indirectly,
persons or their property to influence their participation in the bidding process or
affect the e execution of the Contract.
ARTICLE 5—BASIS OF BID
5.01 Bidder will complete the Work in accordance with the Contract Documents for the following
price(s):
Charlotte Water -Page 4 of 10- C-410,Bid Form
McAlpine Creek WWMF WAS EQ and Blending Facility Revised February 20,2018
and Odor Control Improvements

Item Estimated
No. Description Quantity Unit Bid Price Bid Amount
All costs for all labor,materials,equipment,
supplies,insurance, bonds, permits,fees,
1. taxes,other miscellaneous costs,profit,and 1 Lump Sum N/A $
overhead, both direct and indirect,for
completion of all Work except for those Bid
Items hereinafter listed separately.
Removal of Unsatisfactory Soils and
2. 100 CY
Replacement with Satisfactory Soil Material $ $
3 Pressurized Solids Screens(See Specification 1 Lump Sum N/A $412,000.00
Section 011000,Attachment A)
Subtotal $
4 Contingency Allowance(3%of Summation of 1 Allowance N/A $
Items No. 1—3)
5. Building Permit Allowance 1 Allowance N/A TBD
Instrumentation Integrator Allowance
6. (excluding Taxes)(See Section 011000, 1 Allowance N/A TBD
Attachment B and Section 012100)
TOTAL BID AMOUNT(Summation of Items 1 through 6) $
Charlotte Water -Page 5 of 10- C-410,Bid Form
McAlpine Creek WWMF WAS EQ and Blending Facility Revised February 20,2018
and Odor Control Improvements

5.02 Bidder acknowledges that (1) each Bid Unit Price includes an amount considered by Bidder to be
adequate to cover Contractor's overhead and profit for each separately identified item, and (2)
estimated quantities are not guaranteed, and are solely for the purpose of comparison of Bids,
and final payment for all unit price Bid items will be based on actual quantities, determined as
provided in the Contract Documents.
5.03 All specified cash allowances are included in the price(s) set forth above, and have been
computed in accordance with Paragraph 13.02 of the General Conditions.
5.04 Contingency allowance shall be used only upon written approval of Owner for additional work
not included in the Contract Documents. The amount paid will be negotiated as lump sum or
unit price per each item of additional work. Any unused portion of the allowance remaining at
the completion of the Contract shall revert to Owner as a credit. Owner reserves the right to
delete the allowance from the Contract prior to award. Should an amount other than 3%of the
total Bid price be entered in the space provided, Owner reserves the right to change this
amount to the correct figure.
Charlotte Water -Page 6 of 10- C-410,Bid Form
McAlpine Creek WWMF WAS EQ and Blending Facility Revised February 20,2018
and Odor Control Improvements

ARTICLE 6—TIME OF COMPLETION
6.01 Bidder agrees that the Work will be substantially complete and will be completed and ready for
final payment in accordance with Paragraph 15.06 of the General Conditions on or before the
dates or within the number of calendar days indicated in the Agreement.
6.02 Bidder accepts the provisions of the Agreement as to liquidated damages.
ARTICLE 7—ATTACHMENTS TO THIS BID
7.01 The following documents are submitted with and made a condition of this Bid:
A. Required Bid security
B. List of Subcontractors
C. Equipment Questionnaire/Schedule of Suppliers
D. Commercial Non-Discrimination Certification
E. Debarred Firms
F. E-Verify Certification
G. Non-Collusive Affidavit
H. Certification Regarding Debarment,Suspension and Other Responsibility Matters
I. Byrd Anti-Lobbying Certification
J. Contractor Safety Assessment
K. Sensitive Project Information Distribution List
L. Bidder Qualification Statement
M. Corporate Authority to Execute Bid and Agreement
N. Charlotte Business Inclusion Form 1 and/or 3
ARTICLE 8—DEFINED TERMS
8.01 The terms used in this Bid with initial capital letters have the meanings stated in the Instructions
to Bidders,the General Conditions, and the Supplementary Conditions.
Charlotte Water -Page 7 of 10- C-410,Bid Form
McAlpine Creek WWMF WAS EQ and Blending Facility Revised February 20,2018
and Odor Control Improvements

ARTICLE 9—BID CERTIFICATION
PROJECT: Regional Solids Conveyance Phase 1A—Package 2
BIDDER: [Indicate correct legal name of bidding entity as registered with the City of Charlotte]
By:
[Signature]
[Printed name]
Title:
(If Bidder is a corporation, a limited liability company, a partnership, or a joint venture, attach
evidence of authority to sign.)
Attest:
[Signature]
[Printed name]
Title:
Submittal Date:
Address:
Telephone Number:
Fax Number:
Email:
NC General Contractor's
License No.:
Classification: Limits:
Other Licenses (Type&
No.)
City of Charlotte
Vendor Number:
Communications concerning this Bid shall be addressed to:
Contact Name:
E-Mail Address:
Phone Number:
Address:
(if different from above)
Charlotte Water -Page 8 of 10- C-410,Bid Form
McAlpine Creek WWMF WAS EQ and Blending Facility Revised February 20,2018
and Odor Control Improvements

Subscribed and sworn before me this day of , 20
Signature
My commission expires
If Bid is submitted as a Joint Venture or Partnership, a second Bid Certification must be filled out for
the second member of the Joint Venture or Partnership.
Charlotte Water -Page 9 of 10- C-410,Bid Form
McAlpine Creek WWMF WAS EQ and Blending Facility Revised February 20,2018
and Odor Control Improvements

SECTION 5
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CDM
Smith
Engineering Calculations
Project
Charlotte Water
Regional Solids Conveyance Phase 1A—Package 2
CDM Smith Project No. 1363-235084
Engineering Calculation Package Contents
1. Sludge Storage Tank Sizing
2. Odor Control System Sizing including Sludge Storage Tank Vent Sizing
ock pti�,sy'';
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N?� Laurin B Kennedy
NC PE#030770
2023.10.23 13:02:13-04'00'
Laurin Kennedy, PE
North Carolina License No.030770

CLIENT Charlotte Water JOB NO. 235084 DATE 1/28/21
CDTJI
S i11 t h PROJECT Solids Conveyance DATE CHECKED 9/26/23 COMPUTED BY C.Carden
Solids Quantities and Screened PS&
DETAIL WAS Storage Tank Sizing CHECKED BY Shubha S
Charlotte Water
Solids Conveyance at Stowe Regional WRRF
Solids Quantities and Screened PS &WAS Storage Tank Sizing Calculations
Calculation Description
Tabulation of anticipated solids quantities provided by Hazen and Sawyer for the new Stowe Regional WRRF,as well as calculation of the dimensions
and capacities of the screened sludge storage tanks.Also includes calculation of anticipated pumping schedules in Phase 1 and Phase 2 based on the
solids load,solids concentration,and flow rate.
Final Issued for Bid Initial Review By: R.Tsang Date: 1/29/2021 Digital Signature:
Computed By: C.Carden Date: 1/28/2021 Digital Signature:
Checked By: Shubha S Date: 9/26/2023 Digital Signature:
Final Review By: L Kennedy Date: 10/6/2023 Digital Signature:
1.0 Contents
Tab Number Tab Title Description
1 Cover Sheet This cover sheet
2 Flow and Load Calculations Solids load and flow calculations
3 Tank Calculations Sludge storage tank sizing calculations
4 Pumping Calculations Sludge transfer pumping rate and schedule calculations
5
6
1.1 Purpose/Objective
1. Determine the total hydraulic loading(PS+primary scum,WAS/SWAS+secondary scum)to the screened sludge storage tanks.
2. Determine the new sizing of the sludge storage tanks.
3. Determine the typical transfer pumping flow rates and schedules(pumping out of the sludge storage tanks and to the Irwin Creek
WWTP)based on the Phase 1 and Phase 2 solids loads and concentrations.
4.
5.
1.2 Procedure/Approach
1. Using January 2021 data tables provided by Hazen and Sawyer,calculate the hydraulic loading for primary solids plus primary scum,
and for WAS/SWAS plus secondary scum,in gallons per day at the Phase 2 maximum month flow condition.
2. Calculate the tank volume required to store 6 hours'worth of PS+primary scum and WAS/SWAS+secondary scum.
3. Calculate the dimensions(length,width,sidewater depth)required for storage.Assume all tanks will be the same size,so size based on
the larger of the two volumes calculated in 1.2.2.
4. Calculate the transfer pumping flow rates and number of hours per day to accommodate the Phase 1 and 2 solids loads and
5.
1.3 Data&References
1. November 2020 solids quantities provided by HDR: 2020-11-02 HDR Solids Quantities
2. January 2021 solids quantities provided by Hazen and Sawyer: 2021-01-27 H&S Solids Quantities and Site Plans
3. March 2022 solids quantities provided by Hazen and Sawyer: FW Solids Conveyance Ph 1A Progress Meeting 3 9 22 2.msg
4. Preliminary Engineering Report(contains outdated tank sizes): Final-CLT Water Reg Solids Conveyance.pdf
5.

1.4 Assumptions&Limitations
1. Solids quantities and hydraulic loading are calculated by Hazen and Sawyer through the Phase 2 design period(25 mgd plant capacity).
2. Primary solids and primary scum are screened and stored together.
3. WAS/SWAS and secondary scum are screened and stored together.
4. The screened sludge storage tanks will each consist of two cells(two cells for PS/primary scum and two cells for WAS/SWAS/secondary
scum),for a total of four cells.Six hours of storage of each sludge stream will be provided.
5. Primary solids will be stored at 1%solids.
6. WAS/SWAS will be stored at 0.7%solids.
1.5 Legend
The following color codes are used in this spreadsheet.
Green shaded cell indicates that a manual input is required.
Gray shaded cell indicates a value that is old or not to be used.
No shading in a cell indicates a note,equation or result that does not require manual input.

Charlotte Water Project No: 235084 Calculated by: CDC
Solids Conveyance Checked by: Shubha S Date Calculated: 1/28/2021
Stowe Regional WRRF Solids Quantities Data Received from Hazen and Sawyer Date Checked: 9/26/2022 Page: 1 of 1
November 2020 Solids Quantities
15 mgd MMADF 25 mgd MMADF
Stream Flow Condition Flow(gal/day) TSS(Ibs/day) Solids Conc. lbs/MG treated Max.Month PF Flow(gal/day) TSS(Ibs/day) Solids Conc. lbs/MG treated Max.Month PF
Primary Solids Max Month 150,000 24,000 1.92% 1,600 n/a 150,000 39,500 3.16% 1,580 n/a
WAS Max Month 250,000 16,200 0.78% 1,080 n/a 200,000 24,700 1.48% 988 n/a
January 202.1 Solids 8t Scum Oiiantitie4
Phase 1(15 mgd?) Phase 2(25 mgd?)
Stream Flow Condition Flow(gal/day) TSS(Ibs/day) Solids Conc. lbs/MG treated Max.Month PF Flow(gal/day) TSS(Ibs/day) Solids Conc. lbs/MG treated Max.Month PF
Primary Solids Annual Average 203,040 17,000 1.00% 1,133 335,520 28,000 1.00% 1,120
Max Month 288,000 24,000 1.00% 1,600 1.41 479,520 40,000 1.00% 1,600 1.43
WAS/SWAS Annual Average 279,360 11,200 0.48% 747 305,280 18,300 0.72% 732
Max Month 264,960 15,500 0.70% 1,033 1.38 280,800 24,800 1.06% 992 1.36
Primary Scum Annual Average 5,472 n/a n/a n/a 11,088 n/a n/a n/a
Max Month 5,472 n/a n/a n/a 11,088 n/a n/a n/a
Secondary Scum Annual Average 10,944 n/a n/a n/a 16,560 n/a n/a n/a
Max Month 10,944 n/a n/a n/a 16,560 n/a n/a n/a
PS+primary Scum Annual Average 208,512 at 1% 346,608 at 1%
Max Month 293,472 at 1% 490,608 at 1%
WAS/SWAS+Secondary Scum Annual Average 290,304 at 0.48%WAS 321,840 at 0.72%WAS
Max Month 275,904 at 0.70%WAS 297,360 at 1.06%WAS 441,771 at 0.7%WAS

Charlotte Water Project No.: 235084 Calculated by: CDC
Solids Conveyance Checked by: Shubha S Date Calculated: 1/28/2021
Stowe Regional WRRF Solids Quantities Data Received from Hazen and Sawyer Date Checked: 9/26/2022 Page: 1 of 1
March 2022 Solids huantitiec pW Solids ConveyancePh 1G Progress Meetina 3 9 22 2.msg
Stream Flow Condition 2025 2030 2035 2038 2040 Phase 2
Plant Influent Flow(mgd) Annual Average 9.6 10.9 12.2 12.8 13.4 21.1
PS TSS Load(lb/d) Annual Average 11,250 12,773 14,297 15,000 15,703 23,100
PS VSS Load(lb/d) Annual Average 9,300 10,559 11,819 12,400 12,981 18,900
PS TSS Load(Ib/d) Maximum Month 14,600 16,500 18,500 19,400 20,300 33,100
PS VSS Load(Ib/d) Maximum Month 11,900 13,500 15,100 15,800 16,500 27,000
PS TSS Load(lb/MG) Annual Average 1,172 1,172 1,172 1,172 1,172 1,095 1,159 average
PS Peaking Factor Maximum Month 1.30 1.29 1.29 1.29 1.29 1.43
PS VS/TS% Annual Average 83% 83% 83% 83% 83% 82%
WAS TSS Load(Ib/d) Annual Average 8,900 10,000 11,300 11,800 12,400 19,800
WAS VSS Load(Ib/d) Annual Average 6,900 7,800 8,800 9,200 9,600 15,500
WAS TSS Load(lb/d) Maximum Month 13,000 14,800 16,600 17,400 18,200 28,000
WAS VSS Load(lb/d) Maximum Month 10,200 11,600 13,000 13,600 14,200 21,800
WAS TSS Load(Ib/MG) Annual Average 927 917 926 922 925 938 926 average
WAS Peaking Factor Maximum Month 1.46 148 1.47 1.47 1.47 1.41
WAS VS/TS% Annual Average 78% 78% 78% 78% 77% 78%
After reviewing the March 2022 loads,which were based on lower plant flow rates,the design team decided to stick with the 2021 loads due to their conservatism.

Charlotte Water Project No.: 235084 Calculated by: CDC
Solids Conveyance Checked by: Shubha Date Calculated: 2/17/2021
Stowe Regional WRRF Solids Storage Tank Calculations Date Checked: 9/26/2023 Page: 1 of 1
Tank Volume_Calculationc
Hours of Storage 24 hours at Phase 2 max month
PS+Primary Scum 490,608 at 1%
WAS/SWAS+Secondary Scum 441,771 at 0.7%WAS
Assuming the storaae tanks for PS and WAS/SWAB asp all the same size'
Set Total Storage Volume 492,000 gal
Number of Cells 2 cells
Cell Volume 246,000 gal per cell
Cell Length 47 ft
Cell Width 47 ft
Sidewater Depth(Active) 15 ft above minimum mixer submergence
Minimum Mixer Submergence 3 ft assumed
Freeboard 2 ft
Cell Capacity(Active) .. - 33,135 ft3 per cell includes only liquid above mininum mixer submergence
247,883 gal per cell
Cell Capacity(Total) 39,762 ft3 per cell includes liquid balmy minimum mixer submergence
297,460 gal per cell
Total Capacity(Active Volume) 495,766 gal includes only liquid above mininum mixer submergence
Total Capacity(Total Volume) _ 594,919 gal includes liquid below minimum mixer submergence
Overall Tank Length 97 ft
Overall Tank Width 97 ft

Charlotte Water Project No.: 235084 Calculated by.__ CDC
Solids Conveyance Checked by: Shubha Date Calculated: 2/17/2021
Stowe Regional WRRF Solids Storage Tank Calculations Date Checked: 9/26/2023 Page: 1 of 1
Actual Hours of Storaae Provided in Maximum Month Fxtranolatinn to Starr of Qoeratinnc
Hours of Storage Hours of Storage Hours of Storage
Based on Current Tank Sizing Based on 2019 PER Tank Sizing Based on 2019 PER Tank Sizing
15 mgd(Phase 11, and January 2021 Projections and January 2021 Projections and March 2018 Projections
PS+ WAS/SWAS+ PS+ WAS/SWAS+
Treated Flow Primary Scum @ Secondary Scum Primary Scum @ Secondary Scum PS WAS
PS+Primary Scum ._ 40.5 (mgd) 1%solids @ 0.7%solids 1%solids @ 0.7%solids @ 3%solids @ 0.8%solids
WAS/SWAS+Secondary Scum - 43.1 9 50.3 52.8 4.2 12.6 11.4 11.1
25 mgd(Phase 2) 15 40.5 43.1 3.4 10.3 9.2 9.0
PS+Primary Scum 24.3 25 24.3 26.9 2.0 6.4 5.5 5.4
WAS/SWAS+Secondary Scum 26.9
Previous Tank Active Volume 41,600 118,500
Tank Flevationc gal total gal total
Tank Floor (from Table 8-2 in Conveyance PER)
High Point 600.00 ft
Low Point 599.00 ft Previous B&V Solids Projections
HWL 618.00 ft lbs/day @ 15 mgd 27,100 21,200
Bottom of Top Slab 620.00 ft gal/day 108,313 317,746
Top of Top Slab 621.00 ft assumed slab thickness 12" lbs/day @ 25 mgd 45,200 35,300
gal/day 180,655 529,077

I
Charlotte Water Project No.: 235084 Calculated by: CDC
Solids Conveyance Checked by: Shubha Date Calculated: 8/30/2021 rev 9/7/21&9/9/21
Pumping Calculations Date Checked: 9/26/2023 Page: 1 of 1
PHASE 1 PUMPING CALCULATIONS
Phase 1 Max Month Solids Loads Phase 1 Scum Flows
PS 24,000 lbs/day Primary 5,472 gal/day
WAS 15,500 lbs/day Secondary 10,944 gal/day
Pumping Schedule---> 12 hours/day 16 hours/day 20 hours/day 24 hours/day
Undiluted PS WAS/SWAS PS WAS/SWAS PS WAS/SWAS PS WAS/SWAS PS WAS/SWAS PS WAS/SWAS
Solids +Pri.Scum +Sec.Scum +Pri.Scum +Sec.Scum +Pri.Scum +Sec.Scum +Pri.Scum +Sec.Scum +Pri.Scum +Sec.Scum +Pri.Scum +Sec.Scum
Concentration gal/day gal/day Concentration Concentration gal/min gal/min gal/min gal/min gal/min gal/min gal/min gal/min
0.50% 581,012 382,647 0.50% 0.49% 807 531 605 399 484 319 403 266
0.60% 485,088 320,696 0.59% 0.58% 674 445 505 334 404 267 337 223
0.70% 416,572 276,446 0.69% 0.67% 579 384 434 288 347 230 289 192
0.80% 365,184 243,258 0.79% 0.76% 507 338 380 253 304 203 254 169
0.90% 325,216 217,445 0.88% 0.85% 452 302 339 227 271 181 226 151
1.00% 293,242 196,795 0.98% 0.94% 407 273 305 205 244 164 204 137
1.10% 267,081 179,900 1.08% 1.03% 371 250 278 187 223 150 185 125
1.20% 245,280 165,820 1.17% 1.12% 341 230 256 173 204 138 170 115
1.30% 226,833 153,907 1.27% 1.21% 315 214 236 160 189 128 158 107
1.40% 211,022 143,695 1.36% 1.29% 293 200 220 150 176 120 147 100
1.50% 197,319 134,845 1.46% 1.38% 274 187 206 140 164 112 137 94
Target Max.
Solids
2.0% 149,357 103,870 207 144 156 108 124 87 104 72
Dilution water flow to reach 1.5%solids: 67 43 50 32 40 26 33 22
gal/min gal/min gal/min gal/min gal/min gal/min gal/min gal/min
47,962 30,975 47,962 30,975 47,962 30,975 47,962 30,975
gal/day gal/day gal/day gal/day gal/day gal/day gal/day gal/day

Charlotte Water Project No.: 235084 Calculated by: CDC
Solids Conveyance Checked by: Shubha Date Calculated: 8/30/2021 rev 9/7/21&9/9/21
Pumping Calculations Date Checked: 9/26/2023 Page: 1 of 1
PHASE 2 PUMPING CALCULATIONS
Phase 2 Max Month Solids Loads Phase 2 Scum Flows
PS 40,000 lbs/day Primary 11,088 gal/day
WAS 24,800 lbs/day Secondary 16,560 gal/day
Pumping Schedule---> 12 hours/day 16 hours/day 20 hours/day 24 hours/day
Undiluted PS WAS/SWAS PS WAS/SWAS PS WAS/SWAS PS WAS/SWAS PS WAS/SWAS PS WAS/SWAS
Solids +Pri.Scum +Sec.Scum +Pri.Scum +Sec.Scum +Pri.Scum +Sec.Scum +Pri.Scum +Sec.Scum +Pri.Scum +Sec.Scum +Pri.Scum +Sec.Scum
Concentration gal/day gal/day Concentration Concentration gal/min gal/min gal/min gal/min gal/min gal/min gal/min gal/min
0.50% 970,321 611,284 0.49% 0.49% 1,348 849 1,011 637 809 509 674 425
0.60% 810,449 512,164 0.59% 0.58% 1,126 711 844 534 675 427 563 356
0.70% 696,254 441,363 0.69% 0.67% 967 613 725 460 580 368 484 307
0.80% 610,608 388,263 0.79% 0.77% 848 539 636 404 509 324 424 270
0.90% 543,995 346,962 0.88% 0.86% 756 482 567 361 453 289 378 241
1.00% 490,704 313,922 0.98% 0.95% 682 436 511 327 409 262 341 218
1.10% 447,103 286,889 1.07% 1.04% 621 398 466 299 373 239 310 199
1.20% 410,768 264,362 1.17% 1.12% 571 367 428 275 342 220 285 184
1.30% 380,024 245,300 1.26% 1.21% 528 341 396 256 317 204 264 170
1.40% 353,671 228,962 1.36% 1.30% 491 318 368 239 295 191 246 159
1.50% 330,832 214,801 1.45% 1.38% 459 298 345 224 276 179 230 149
Target Max.
Solids
2.0% 250,896 165,241 348 230 261 172 209 138 174 115
Dilution water flow to reach 1.5%solids: 111 69 83 52 67 41 56 34
gal/min gal/min gal/min gal/min gal/min gal/min gal/min gal/min
79,936 49,560 79,936 49,560 79,936 49,560 79,936 49,560
gal/day gal/day gal/day gal/day gal/day gal/day gal/day gal/day

C Drfi CLIENT CHARLOTTE WATER JOB NO. 1363-235084
SmithPROJECT STOWE Last Revison: 9/26/2023
DETAIL ODOR CONTROL SYSTEM SIZING
ODOR CONTROL SYSTEM SIZING
Calculation Descriptior This calculation is intended to size an odor control system for sludge processes requiring foul air treatment included in this project,
including the near term and future Primary Sludge(PS)Tanks(total of 2),near term and future Waste Activated Sludge(WAS)Tanks
(total of 2),and the sludge screenings facility.
Initial Review By: Bruce Singleton Date: 9/24/2021 Digital Signature: BRUCE SINGLETON
Computed By: Kara DeGroote Date: 9/24/2021 Digital Signature: Kara DeGroote
60%Design
Checked By: Camren Shea Date: 1/12/2023 Digital Signature: Camren Shea
Final Review By: Bruce Singleton Date: 9/4/2023 Digital Signature: BRUCE SINGLETON
1.0 Contents(Description o 1 Cover Sheet
2 PS&WAS Tanks Flows
3 Solids Transfer Building
4 Process Flow Diagram(PFD)
5 BioAir[Odor Control System Selection]
6 Daniel Co.[Odor Control System Selection]
1.1 Purpose/Objective:
1.1.1 To size a biotrickling filter/bioscrubber for Stowe WRRF Primary&Waste-Activated Sludge Storage Tanks and the new Screenings Buildng.Two of the four
tanks eventually needing odor control will be built in the future.This calculation also include commentary on the phasing of the odor control system.
1.2 Procedure/Approach:
1.2.1 Calculate total volume of all structures requiring odor control associated with project.
1.2.2 Design Criteria
1.2.2.1 Odor control for the tanks was sized as large as possible while still being economically viable and controlling fugitive
emissions.
1.2.2.2 Duct sizes were determined using a manual Trane ductilator.
1.3 Data and References:
1.3.1 Drawings of the PS&WAS Storage tanks are here&in c Stowe Sludge Storage Tank Sketches 2020 0910 OC edits.pd Odor Controlled Areas Drawings
1.3.2 Drawings of the Screenings Building are here and in calc:STPS Screenings Room Draft Sketches KVA 2021 10 07.pdf Odor Controlled Areas Drawings
1.3.3 Duct sizes were determined using a TRANE Ductulator but similar online calculators are also available at: Online Ductulator
1.3.4 Vendor Proposals
BioAir
Daniel Co.
1.4 Assumptions
and Limitations:
Odor control for the screenings building was sized for 12 ACH.6 ACH are required for the space to be unclassified by NFPA 820 standards.12 ACH was
1.4.1 selected for air quality control.The dead space in the screenings building storage space is to be ventilated by HVAC and is not economical to treat using odor
control.
No odor control is required in sludge transfer pump room or electrical room. HVAC will provide ventilation in all other rooms in the solids building as well as the
1.4.2 storage space in the screenings room.
1.4.3 The dumpsters will not have enclosures.
1.4.4 Friction or selecting duct sizes losses per 100 ft were assumed to be 0.08 inches
1.4.5 Safety factor of 0.15 is only applied to flows required to declassify a space and are not needed if ACH exceeds NFPA required flow.
1.5 Legend:
1.5.1 Referenced Input Values
1.5.2 Odor Control Flow Design Criteria
1.5.3 Area ventilated by HVAC
1.5.4 Area ventilated with Odor Control

1.6 Conclusions:
1.6.1 The odor control system was evaluated for the following scenarios.Yellow highlights indicate flows selected.
1.6.2 1.6.1.1 Primary tanks were evaluated for the following scenarios
Scenario Flow Notes
Max WSE with 6 ACH 1785 cfm not selected
LWSE with>3 ACH 7292 cfm selected
LWSE with 6 ACH 13139 cfm not selected
The selected flow to the tanks is based on control of fugitive emissions and not odor control.These tanks will be operated with varying water
levels.These tanks will frequently be operated under low water condtions.While 6 ACH is often used as a design criteria for the headspace
in classified tanks,it is not economical to provide 6 ACH for empty tanks,and doing so would require two biotrickling filter vessels on site
instead of one.The most important design criteria for these tanks is that they be under negative pressure to prevent fugitive emissions
Therefore,3 ACH at the low water level was selected as the basis of design sizing of the OC system as this will provide the needed
negative pressure in the classified tanks while also maximizing the use of a single biotrickling filter vessel.This will also provide well over 6
ACH when the tanks are full.Additionally,the tanks will have corrosion liner.
1.6.1.2 The screening room is an unclassified space;therefore flows have the selected safety factor
applied. The following scenarios were evaluated:
Scenario Flow Notes
Screenings building with 6 ACH&15%SF 2800 cfm not selected
Screenings building with 12 ACH&15%SF 4900 cfm selected
Screenings building with 6 ACH and curtains ar 1400 cfm not selected
The 6 ACH scenario was selected as 6 ACH are required for an unclassified space in a screening
room.12 ACH may improve odors but significantly increases sizes of scrubber.
1.6.3 The selected sizing of the scrubber for near and future term was based on WAS/PS Tanks with>3 ACH at the low
water level and the screenings room w/a 15%SF at 12 ACH for a total flow of:
Near term 8550 cfm
Future: 12200 cfm
The size difference between a scrubber installed for the near term and future term flow did not justify installing one vessel now and a second in a future(-2 ft
difference depending on vendor).Thus,the selected vessel sizing is for the full future flow.The selected fans should also cover the range of flow from 8,550 to
12,200 cfm.
The vendor proposals for a unit with a max flow of 12,200 cfm are:
Vessel Velocity EBRT
Vendor Diameter Notes
(ft/min)' (seconds)
MI
BioAir 11.8 112 14
Daniel Company 13.5 85 15 Basis of design
Max recommended velocity is 120 ft/min.Both vendor selections meet this criterion.
1 1.6.4 Estimated Loadings
Avg H2S 15 ppm
Max H2S 50 ppm

PRIMARY SLUDGE & WAS TANK ODOR CONTROL FLOWS SELECTION
Theoretical
Air Duct Size Theoretical Duct
Odor Controlled Unit Length(ft)Width(ft) Headspace(ft) Volume)ft^3) Changes CFM (inches)with CFM per Size(inches)with Notes
per Hour 0.08"w.c.loss pick inlet 0.08"w.c.loss per
(ACH) per 100 ft of 100 ft of duct
duct
Option A)6 ACH when tanks are typically full Not selected;less conservative and less
Primary Solids Storage Tank No.1 47 47 2.02 4462.18 6 446 11 223 8 frequent scenario in near term as tanks
Primary Solids Storage Tank No.2 47 47 2.02 4462.18 6 446 11 223 8 will typically be operated at lower levels
WAS Storage Tank No.1 47 47 2.02 4462.18 6 446 11 223 8 in the future.
WAS Storage Tank No.2 47 47 2.02 4462.18 6 446 11 223 8
Total 1785
Option B)>3 ACH+10%SF at tank low water level Selected scenario;consistent with
Primary Solids Storage Tank No.1 47 47 14.9 32848 3.3 1823 20 912 14 expected lower operating levels of tanks,
Primary Solids Storage Tank No.2 47 47 14.9 32848 3.3 1823 20 912 14 particularly in near term and will provide
WAS Storage Tank No.1 47 47 14.9 32848 3.3 1823 20 912 14>6 ACH of full tanks in future.
WAS Storage Tank No.2 47 47 14.9 32848 3.3 1823 20 912 14
Total 7292
Option C)6 ACH at tank low water level
Primary Solids Storage Tank No.1 47 47 14.9 32848 6.0 3285 20 1642 14 Not selected;overly conservative and not
Primary Solids Storage Tank No.2 47 47 14.9 32848 6.0 3285 20 1642 14 economical(results in using two
WAS Storage Tank No.1 47 47 14.9 32848 6.0 3285 20 1642 14 biotrickling filter vessel units)
WAS Storage Tank No.2 47 47 14.9 32848 6.0 3285 20 1642 14
Total 13139
Plan View
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SCREENINGS BUILDING ODOR CONTROL FLOWS SELECTION
Height Air
Length (ft)/ Volume Changes
Screenings Building Odor Controlled Unit Width(ft) CFM NOTES
(ft) Headspac (ft^3) per Hour
e (ACH)
Option IA)Screenings Room with Odor Control at 6 ACH
Screenings Room Not selected;6 ACH is enough to declassify
the screenings room,but odors were more of
31 22.7 35.1 24387 6 2439 a concern
Total 2439
Total w/15%SF on classification 2804
Rounded 2800
Option 113)Screenings Room with Odor Control at 12 ACH
Screenings Room Selected option;12 ACH selected despite 6
31 22.7 35.1 24386.81 12 4877 ACH being required for an unclassified space
Total 4877 given the nature of odors from dumpsters/to
Rounded provide a work-friendly environment
4900
Option 1C)Screenings Room with Odor Control at 12 ACH with storage space
Screenings Room Not selected;HVAC to ventilate additional
31 22.7 35.1 24386.81 12 4877 space created by storage area with no foul air
Additional Storage Space 4200 12 840 sources
Total 5717
Total w/SF 6575
Rounded
Option 2)Screenings Room with Enclosed Dumpsters
Enclosed Dumpster Area Not selected;too many concerns with access
21 18 32 12096 6 1210 to dumpsters with enclosures
Total 1210
Total w/SF 1391
Rounded
1400
Solids Transfer Building Enlarged Screenings Room Sections
d
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OPTION 2
Section view of dumpster enclosure area
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A DISCHARGE • NINGS
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CLEARANCE o
AROUND CURTAIN ,-`' I
in
SCREENINGS
DUMPSTER
6'W X 91 X 6'H
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1 FIN F
SLUDGE SCREENING ROOM SECTION

ODOR CONTROL SYSTEM PROCESS FLOW DIAGRAM
Notes:
1.Ducts and biotrickling filter vessel were sized to accommodate flows from future structures shown with a dotted outline
Legend:
FFuture facilities I
8lotrickline Filter Scrubber
Near Term Flow(cfm) 8546
I— Future Flow(cfm) 12192
Primary Solids Tank N0.2 Primary Solids Tank No.1 Duct Size(in) 36 38"duct is not std
Foul Air Exhuast No.1 Foul Air Exhaust No.2 Foul Air Exhuast No.1 Foul Air Exhaust No.2
Flow(cfm) 912 Flow(cfm) 2 Flow(cfm) 912 Flow(cfm) 912
Duct size(in) 14 Duct size(in) 4 Duct size(in) 14 Duct size(in) 14 Near Term Flow(cfm) 8546
Future Flow(cfm) 12192 Screenings Building
'Duct Size(In) 36 38"duct
is not std
Near Term D Near Term 0 Near Term 1823 Near Term 3646 Near Term/Future 4900 with 15%5F for indoor space;no
Flow(cfm) Flow(cfm) Flow(cfm) Flow(cfm) Flow(dm) change for future
Ille Future Flow 1823 Future Flow 3646 Future Flow 5469 Future Flow 7292 Duct size(In) 28
(cfm) (cfm) (cfm) (cfm)
Duct size(in) 20 Duct size 24 Duct size(in) 28 32
(in) Duct size in)
r 1
Foul Air Exhuast .I Foul Air Exhaust N 2 I Foul Air Exhuast o.1 Foul Air Exhaus o.2
Flow(cfm) 912 Flow(cfm) 912 Flow(cfm) 912 Flow(cfm) 912
Duct size(in) 14 Duct size(in) 141 Duct size(in) 14 Duct size(in) 14
WAS Storaee Tank N0,2 I WAS Storage Tank No.1
L I

BIOAIR SYSTEM DESIGN
Proposed Treatment System
bkoair -
System 1WAS Pump Station
nrrn�hr 13rrrr
BloAir Proposal No: 0211A025 Stowe WWTP
Reactor Vessel: EcoFilter EF126.5
Technology Type: Biotrickling Filter
Total Price: $903,400 (FOB Project Site)
Design Conditions
Transient
Parameter Units Average Maximum Remarks
Airflow (cirri) 12200 2200
Hydrogen Sulfide(H_S) (ppmv) 15 50
Volatile Organic Compounds(VOCs) (ppmv) <0.5 < 1.0 Assumed
Reduced Sulfur Compounds(RSCs) (ppmv) <0.5 <1.0 Assumed
Volatile Fatty Acids(VFAs) (ppmv) <0.5 <1.0 Assumed
Odourous Air Temperature (`F) 59-100 105
Ambient Air Temperature (`F) 33-110 120
EcoFilter EF126.5 Reactor Details Performance Guarantee*
H, (avg): 99%or< 0.
Quantity: 1 5 ppmv
Height: 37.6 ft(excluding stack) Odor(avg): 90%or<600 OU
Diameter: 11.8 ft 'Based on'Design Conditions'above and ThoAir Standard Performance
Operating Weight: 78725 lb Test Protocol'
Pressure Drop. 9.6 in. w.c. (estimated)
Major Equipment Included Field Services Included
2 Blowers(1 dulyti standby) Equipment Startup and Operator Training
Electrical Control Panel Installation Supervision and Approval
Water Control Panel w!Nutrient Dosing System
Required Utilities
Electrical Power Supply: 480 V/3-phase/60 Hz
Energy Use: 727.7(kw*hr)./day(estimated)
Instantaneous Water Supply: 34 gpm @ 85 psi(intermittent)
Water Use": 3500 gal/day
Nutrient Powder"': 420 lb/year
Mixed Nutrient Solution***: 42 gal/month
Water use is directly proportional to the avg H;S concentration and assumes drain water pH=1.7.
It the actual H;S concentration is lower,the water use will be lower.
Nutrients are not required,provided that the water supply contains 1-5 n a total P and 3-20 !L total N.
e4 PP Y �9 �]

DANIEL CO. SYSTEM DESIGN
Re:Stowe Odor Control System Project 4840
0 Harold Ibarra<[e-mail]>
To ODeGroote,Kara V.
Cc t'Tim Malki; Dillan Truong; Jack Moser; Sasha Larionova; Bin Ngo
iQ You forwarded this message on 12/14/2022 301 PM.
® BioDan-12000 13.5ft 3 Bed BTF.pdf ® A41-9-272FA100FGFCQ3_12200cfm.pdf v
.pdf File pdf File
Kara,
I was able to review the updated H2S loadings and can confirm that our system sizing will be the same as before;see below:
BloDan Biotrickling filter
Flowrate Outlet Bed Superficial Bio- Bio-Media
Flowrate Diameter tt of per Bed with EBRT Surface Face Media Differential
Height
(CFM) (ft) Vessels Vessel Demister (sec) Area Velocity Volume Pressure(in-
(CFM) (ft) (In,0) (ft') (ft/min) (fta) w.c.)
12200 13.5 1 12200 21.31 60 15.00 143.14 85.23 3050.00 2.10
THE DANIEL COMPANY ODOR CONTROL SOLUTIONS
BIO-DAN 12,000 SERIES
SYSTEM DETAILS:
• DESIGN AIRFLOW:9,000- 15,007 CFM
• 13'-6"0 X 32'-6"SSH,BIO-TRICKLING FILTER VESSEL
• 3,000 FTA3 RETICULATED POLYURETHANE MEDIA(21'0"DEPTH IN 3 BEDS)
• H25 REMOVAL EFFICIENCY>99%
• 15 SECONDS EERT
• 3 IN.-W.0 MAX DRESSURE DROP
• VESSEL OPERATNG WEIGHT=78.000 LBS/PER VESSEL
STANDARD EQUIPMENT:
• AMCA CERTIFIED ISOLATION DAMPERS TESTED BUBBLE-TIGHT l)30"W.C.
• FRP CENTRIFUGAL FANS RATED AT 12,000 CFM cs 8"W.C.TSP
• MAG-DRIVE CHEMICAL RESISTANT RECIRCULATION PUMP
• FRP LADDER/PLATFORM/RAILING SYSTEM(S)SHOWN BUT OPTIONAL
• ELECIKICAL CON PANEL
• WATER CONTROL PANEL W/NUTRIENT FEED SYSTEM
• OUTLET MOUNTED MUNTERS T-271 MIST ELIMINATOR
ADDITIONAL COMPONENTS NOT SHOWN;
• DIFFERENTIAL PRESSURE GAUGES FOR:FAN/MEDIA/MIST ELIMINATOR
• PH&FLOW SENSING INSTRUMENTATION
• PLC&INTEGRATED TOUCH PANEL OPTIONAL
UTILITY REQUIREMENTS:
• 480V-3PHASE POWER,
• 4-6 GPM PLANT WATER(SECONDARY TREATEDI OR RECLAIMED WATER(NON CHLORINATED)
• 50-60 GPM PVC OR LINED DIP DRAIN TO SEWER

CDM CLIENT CHARLOTTE WATER JOB NO. 1363-235084
S m t h PROJECT STOW E
DETAIL PS 8 WAS TANK VENT SIZING
ODOR CONTROL SYSTEM SIZING
Calculation Descriptior This calculation is intended to determine the max flow into or out of the vents at any given time and determine what type of damper will be used.
Initial Review By: Bruce Singleton Date: 2/2/2023 Digital Signature Bruce Singleton
•
Computed By: Kara DeGroote Date: 9/6/2023 Digital Signature Kara DeGroote
60%Design
Checked By: Alexandria Stuart Date: 9/15/2023 Digital Signature' Alexandria Stuart
Final Review By: Bruce Singleton Date: 9/18/2023 Digital Signature. Bruce Singleton
1.0 Contents(Description 131 1 Cover Sheet
2 Tank Vent Sizing
1.1 Purpose/Objective:
1.1.1 To size vents for Stowe PS and WAS storage tanks and determine damper types.
1.2 Procedure/Approach:
Calculate the max flows required to go through the vents for sizing of the vents.Confirm the difference between the max and min flow through the
vent is not significant enough to warrant a barometric damper.
1.3 Data and References:
1.3.1 Referenced values listed in tabs.
1.3.2 90%drawings can be found here: CLTW Regional Solids Conveyance Ph1A Pkg2 90%Drawings Feb 2023.pdf
1.3.3 Vent duct sizes were determined using a TRANE Ductulator but similar online calculators are also available at: Online Ductulator
Vent duct friction(head)loss was assumed to be 0.08 inches per 100 ft of duct.
1.4 Assumptions and Limitations
Max Influent Max Effluent
Tank Pumping Rate, Pumping Max Drain
gpm Rate',gpm
Rate',gpm
1.4.1 PS Tank 360 640 ' 882
WAS Tank
Draining Rate 690 650 882
*Note that pumped effluent and drain do not occur at the same time.If the sludge tank drains are open it will be to drain
secondary treatment effluent and will not be pumping sludge.Therefore,drain rates for secondary effluent are used for vent
calcs as these are larger than max pumped rates for sludge.
1.5 Legend:
1.5.1 Selected Design Value in calc
1.6 Conclusions:
1.6.1 Each tank will have two vents with the following sizing:
PS Tanks 14 in.
WAS Tanks 14 in.
1.6.2 The difference between the max flows for the tanks are as follows:
PS Tanks 83 cfm
• WAS Tanks 105 cfm
These differences are small enough that a barometric damper is not warranted in lieu of a balancing damper.

Primary Solids&Primary Scum Tanks
Filling Notes
Total OC Withdraw,cfm -1800 (900 cfm per foul air pick up exhaust;2 exhausts per tank)
Sludge Max Filling Rate,cfm 48 assumes max fill rate is 360 gpm
Flow through Vents,cfm -1752
Draining
OC Withdraw,cfm -1800 (900 cfm per foul air pick up exhaust;2 exhausts per tank)
-118 assumes max drain rate is 882 gpm;the drain would be open if
Sludge Max Drain Rate,cfm secondary treatment is stored in the tanks and drained;therefore
the drains and max pumping rate of 650 gpm should not occur
simultaneously
Flow through Vent,cfm -1918 draining condition is driving force for vent sizing
Vent Sizing
Max Flow through Vents,cfm 1918
No.of Vents 2
Flow per vent,cfm 959
Selected Vent Size,in 14
Difference between Min and Max Flows per Vent
not significant enough of a difference to warrant a barometric
Flow,cfm damper in lieu of balancing damper;this is also a conservative
83 scenario
WAS,SWAS,&Secondary Scum
Filling Notes
Total OC Withdraw,cfm -1800 (900 cfm per foul air pick up exhaust;2 exhausts per tank)
Sludge Max Filling Rate,cfm 92 assumes max fill rate is 690 gpm per reference page
Flow through Vent,cfm -1708
Draining
OC Withdraw,cfm -1800 (900 cfm per foul air pick up exhaust;2 exhausts per tank)
assumes max drain rate is 882 gpm per reference page; per
reference page,the drain would be open if secondary treatment
Sludge Max Draining Rate,cfm is stored in the tanks and drained;therefore the drains and max
pumping rate of 650 gpm should not occur simultaneously
-118
driving max flow for vent sizing when draining;not significant
Flow through Vent,cfm enough of a difference to warrant a barometric damper;per
emails to the right,this is also a conservative scenario
-1918
Vent Sizing
Max Flow through Vents,cfm 1918
No.of Vents 2
Flow per vent,cfm 959
Selected Vent Size,in 14
Difference between Min and Max Flows per Vent
not significant enough of a difference to warrant a barometric
damper in lieu of balancing damper;this is also a conservative
Flow,cfm 105 scenario per reference page

SECTION 6
0
•
IJ
U
Q.)

Stowe Regional WRRF
Residuals Management Plan
Introduction
Primary solids (PS) and waste activated sludge (WAS)generated by the treatment processes at the Stowe
Regional WRRF will be pumped to the pressurized solids screens in this project.The screens will remove
solids particles larger than 5mm from the PS and WAS streams. The screened PS and WAS will flow to
their respective storage tanks; one tank is designated for storage of PS, and the other tank is designated
for storage of WAS. Solids transfer pumps (included in the fast track sewer permit with the force mains)
will transfer the PS and WAS from these storage tanks via force mains to the sewer collection system,
which will convey the PS and WAS to the McAlpine Creek WWMF. A copy of the McAlpine Creek WWMF
Residuals Management Plan is attached for reference.
Required Elements of the Residuals Management Plan
1. A detailed explanation as to how the generated residuals(including trash,sediment and grit)
will be collected, handled, processed,stored,treated,and disposed.
Response: Refer to the attached McAlpine Creek WWMF Residuals Management Plan for a
description of how the Stowe Regional WRRF's PS and WAS will be collected, handled,
processed,stored,treated,and disposed.
2. An evaluation of the treatment facility's residuals storage requirements based upon the
maximum anticipated residuals production rate and ability to remove residuals.
Response: Refer to the attached McAlpine Creek WWMF Residuals Management Plan and the
design calculations for the Stowe Regional WRRF.
3. A permit for residuals utilization or a written commitment to the Applicant from a Permittee of
a Department approved residuals disposal/utilization program that has adequate permitted
capacity to accept the residuals or has submitted a residuals/utilization program application.
Response: Refer to the attached McAlpine Creek WWMF Residuals Management Plan.
4. If oil,grease,grit or screenings removal and collection is a designated unit process,a detailed
explanation as to how the oil/grease will be collected, handled, processed,stored and
disposed.
Response: The resulting screenings are conveyed out of the screens and fall into a roll-off
dumpster below the screen platform. The dumpster containing these screenings,which are
anticipated to be between 35 and 45 percent dry solids,will be removed and replaced on a
regular basis by a subcontractor to Charlotte Water. The subcontractor will haul the screenings
offsite for disposal at a local landfill.

Charlotte Water McAlpine Creek WWMF
Residuals Management Plan
The McAlpine Creek Wastewater Management Facility(WWMF) is Charlotte Water(CLT Water)'s largest
treatment plant. It has a permitted capacity of 64 MGD. In addition to sanitary sewage flows from the
McAlpine Creek Basin, it also currently accepts and treats primary sludge (PS) and waste-activated
sludge (WAS)from the Sugar Creek WWTP. Other plants also have the ability to bypass incoming
sanitary sewage flows to the McAlpine Creek WWMF in case of emergency.
Based on the 2013 Biosolids and Residuals Master Plan (Master Plan) and 2019 Regional Solids
Conveyance Preliminary Engineering Report, CLT Water plans to transform McAlpine Creek WWMF to a
regional solids treatment facility by implementing a thermal hydrolysis process (THP), coupled with
anaerobic digestion at the McAlpine Creek WWMF.The McAlpine Creek WWMF currently receives PS
and WAS from the Sugar Creek WWTP and will receive PS and WAS in the future from the planned
Stowe Regional Water Resource Recovery Facility(WRRF) as well as the Irwin Creek WWTP.
The following sections describe the required elements of the Residuals Management Plan.
1. Detailed explanation as to how the generated residuals(including trash,sediment and grit)will be
collected,handled,processed,stored, treated, and disposed.
Currently,Sugar Creek WWTP PS are combined with PS from the McAlpine Creek WWMF at the PS
screening and flow splitting facility prior to gravity thickening. WAS from Sugar Creek WWTP is blended
with McAlpine Creek WWMF WAS and gravity thickener scum in the WAS pump station wet well.
Conveyance of Sugar Creek PS and WAS is done by dedicated forcemains.The solids treatment process
consists of gravity thickening of PS and centrifuge thickening of WAS,followed by anaerobic digestion
and centrifuge dewatering of the digested solids.The dewatered Class B biosolids are conveyed into
cake storage bins and loaded into trucks, which transfer the biosolids into the Residuals Management
Facility(RMF)for storage prior to land application.
2. Evaluation of the treatment facility's residuals storage requirements based upon the maximum
anticipated residuals production rate and ability to remove residuals.
The projected residuals production rates are described in detail in the 2021 Thermal Hydrolysis Process
and Solids Regionalization Improvements PER and are summarized in Table 1 below.After the
implementation of THP at the McAlpine plant,the RMF will have up to 90 days of storage available for
the final product. With over 10000 acres of land permitted in NC and SC, Charlotte Water will also be
able to move the product reliably from the plant.
3.A permit for residuals utilization or a written commitment to the Applicant from a Permittee of a
Department approved residuals disposal/utilization program that has adequate permitted capacity to
accept the residuals or has submitted a residuals/utilization program application.

CLT Water holds a permit for land application of its Class B residuals(RLAP Permit No.WQ0000057).
Landfills are used if biosolids fail to meet all requirements for land application, or during wet weather
conditions when land is not available.

Table 1. Projected Wastewater Flows and Solids Loads
Total Undigested
111
11114 Annua Undigested PS Undigested WAS. Solids Production
:Year Average (DT/day) (DT/day) (DT/day)
Flow :Annual Max. Annual Max. Annual Max.
(MGD) ,Avg.Day Month Avg.Day Month' Avg.Day Month
2020 49.5 26.2 35.9 28.7 36.7 54.9 72.7
2025 49.2 26.1 35.7 28.5 36.5 54.6 72.3
McAlpine Creek 2030 53.3 28.2 38.7 30.9 39.6 59.2 78.3
WWMF
2035 57.6 30.5 41.8 33.4 42.8 63.9 84.6
2040 61.7 32.7 44.8 35.8 45.8 68.5 90.6
2020 16.0 10.4 13.5 7.6 9.1 18.0 22.6
2025 16.0 10.4 13.5 7.6 9.1 18.0 22.6
Sugar Creek 2030 16.0 10.4 13.5 7.6 9.1 18.0 22.6
WWTP
2035 16.0 10.4 13.5 7.6 9.1 18.0 22.6
2040 16.0 10.4 13.5 7.6 9.1 18.0 22.6
2020 11.6 9.8 11.9 7.0 9.1 16.7 21.0
2025 13.5 11.3 13.8 8.1 10.5 19.4 24.4
Irwin Creek 2030 13.5 11.3 13.8 8.1 10.5 19.4 24.4
WWTP
2035 13.5 11.3 13.8 8.1 10.5 19.4 24.4
2040 13.5 11.3 13.8 8.1 10.5 19.4 24.4
2020 N/A - - - - - -
2025' 8.8 7.1 9.2 4.8 6.2 11.9 15.4
Stowe Regional 2030 10.2 8.1 10.6 5.5 7.1 13.6 17.7
WRRF
2035 13.8 11.1 14.4 7.5 9.7 18.5 24.1
2040 17.9 14.4 18.7 9.7 12.6 24.1 31.3
'Anticipated first year of operation. 1
4. If oil, grease, grit or screenings removal and collection is a designated unit process, a detailed '
explanation as to how the oil/grease will be collected, handled, processed, stored and disposed.
Primary sludge from the North and South Plant primary clarifiers at the McAlpine Creek WWMF and the
Sugar Creek WWMF are consolidated at the primary sludge screening and flow splitting facility.The
combined sludge is screened through a 'A in. mechanically cleaned screen and sent to a splitter box,
where it is split among four gravity thickeners.