NC0026441_Application_20241024

Hazen Hazen and Sawyer
4011 Westchase Boulevard,Suite 500
Raleigh,NC 27607•919 833 7152
October 24,2024
Mr.Nick Coco,PE
APRA Environmental Program Supervisor II via email: nick.coco(a,deq.nc.gov
NC Department of Environmental Quality
Division of Water Resources/Water Quality Permitting na(0(4L\ 2-.
1617 Mail Service Center
Raleigh,NC 27699-1617
Re: Siler City WWTP
6.0 MGD Wastewater Treatment Plant Improvements
ATC No.026441A01
NPDES Permit No.NC0026441
Request for Amended Authorization to Construct
4.0 MGD Biological Nutrient Removal Process Upgrades
Dear Mr. Coco:
The Town of Siler City(Town)previously received an Authorization to Construct(ATC) dated August
22,2023 for the 6.0 MGD Wastewater Treatment Plant Improvements(WWTP Improvements)project
designed by McGill Associates. This project includes the completion of a new 2.0 MGD treatment train
and conversion of the existing 4.0 MGD biological process. The project is currently under construction
with an anticipated completion date of March 29,2027. These process improvements will not be in
service in time for the Siler City WWTP to meet its Total Nitrogen(TN) limit in 2025-2026 or comply
with NPDES permit requirements that the 2.0 MGD treatment train be in service by August 31,2024 and
the entire 6.0 MGD improvements project operational by December 31,2024.
As a result,the Town is requesting approval of an Amended ATC to construct a proposed 4.0 MGD
Biological Nutrient Removal Process Upgrade(4.0 MGD BNR Process Upgrade)project that will convert
the biological process to a 4-stage Bardenpho process to improve treatment performance and reliability
until the 6.0 MGD WWTP Improvements project is operational. The proposed 4.0 MGD BNR Process
Upgrade project,designed by Hazen and Sawyer(Hazen),will be constructed by Shook Construction as a
Change Order to the 6.0 MGD WWTP Improvements project. The proposed 4.0 MGD BNR Process
Upgrade project has been designed to not adversely impact the construction of the permanent
improvements and will allow the Town to meet its annual TN limit between 2025 and completion of the
6.0 MGD WWTP Improvements project.
We anticipate completing negotiations and issuing an executed Change Order with DWI concurrence by
December 31, 2024. After procuring supplies and equipment,we anticipate an active three-month
construction period that will be completed by May 30,2025.
hazenandsawyer.com

Hazen Mr. Nick Coco,PE
October 24, 2024
In accordance with ATC Form 10-23 instructions,the following items are enclosed for your review as a
single electronic PDF and hard copy:
• Tab A—Completed ATC Form 10-23,signed by authorized representatives from the Town and
Hazen
• Tab B—Siler City NPDES Permit No.NC0026441
• Tab C—Sider City Special Order of Consent WQ S22-033
• Tab D—Construction Sequence Plan
• Tab E—Engineering Calculations
• Tab F—Copy of Engineering Plans suitable for Change Order development
• Tab G—Copy of Supplemental Technical Specifications suitable for Change Order development
As this is an Amendment to the previously issued ATC,we have not included a check made payable to
NC DEQ for$1,000.00 as part of this submittal.
The enclosed process design calculations assume a 5.0 MGD maximum month condition for
conservatism. Estimates of historical monthly average flows between April 2022 and April 2024, future
domestic allocations with 2%annual growth,reserve domestic capacity of 190,000 gallons per day,
unused significant industrial permitted allocations,and committed future industrial allocation for
Wolfspeed through 2027 were all considered for a worst case scenario. In practice,we anticipate monthly
average flows to be at or below 4.0 MGD based on historical usage patterns and Wolfspeed's actual
monthly flow projections.
As this project will be constructed by Change Order to the original 6.0 MGD WWTP Improvements
project,the Supplemental Technical Specifications included in Tab G were prepared by Hazen and reflect
additional requirements that were not addressed in the technical specifications prepared by McGill
Associates. The Contract Documents prepared by McGill Associates will be utilized by the contractor for
contract requirements,general requirements, and any technical elements that are not expressly included in
the Supplemental Technical Specifications provided in Tab G. This arrangement is defined in Hazen's
package.
In accordance with 15A NCAC 02H.0124,multiple components of key process equipment are generally
required for redundancy. Due to the urgent nature and constructability considerations of the proposed
project,fully redundant equipment will not be installed for the following elements:
• Repurposed surface mixers
• Nitrate recycle(NRCY)pumps
• Positive displacement(PD)blowers
Page2of
hazenandsawyer.com

Hazen Mr. Nick Coco,PE
October 24, 2024
To address the intent of the requirement,a shelf spare NRCY pump and surface mixer will be purchased
by the contractor and stored onsite for immediate replacement,if necessary. Construction of the 6.0 MGD
WWTP Improvements project will be occurring onsite during the operational period of the 4.0 MGD
BNR process upgrades. If failure of a NRCY pump or mixer were to occur,the contractor will have onsite
the means necessary to replace the failed piece of equipment.
Two rental PD blowers will be provided for each of two oxidation ditches.Under annual average
operating conditions, only one operational PD blower is required to maintain the design dissolved oxygen
concentration of 2 mg/L. The operation of the second PD blower is only required during maximum month
or peak day conditions. As part of the PD blower rental agreement,regular preventive maintenance and
repairs will be covered and performed by the vendor. In the event of equipment failure,the vendor will be
responsible for providing a replacement rental PD blower.
In addition,the existing SC WWTP does not currently have access to standby power or a redundant
power supply serving the portion of the treatment process that will be modified as part of the proposed 4.0
MGD BNR Process Upgrade project. The 6.0 MGD WWTP Improvements project does include new
standby power,but it will not be available to support the equipment installed as part of the 4.0 MGD BNR
Process Upgrade project due to long lead times for equipment manufacturing and shipping. Hazen
originally planned to source previously used standby power units in the local market to meet the short-
term needs of the 4.0 MGD BNR Process Upgrade project,but recent severe weather events including
Hurricane Helene are expected to limit availability of used units and result in lead times of 50 to 130
weeks for new units. As a result,we would like to discuss the need to meet the requirements of 15A
NCAC 2T .0505(1)for the 4.0 MGD BNR Process Upgrade project.
Please do not hesitate to contact me if you have any questions as you review this request. I may be
reached at 919.412.8356 and jbbuckley(ahazenandsawyer.com.
Very truly yours,
HAZEN AND SAWYER
J. Brenan Buckley, ' , B E
Associate Vice Pres
Enclosures
cc: Jack Meadows,Town of Siler City Michael Montebello,NC DEQ
Chris McCorquodale, Town of Siler City David Honeycutt,McGill Associates
Brittany York,Town of Siler City TJ Lynch,Hazen
Vic Czar, City of Sanford
Paul Weeks,City of Sanford/Tri River Water
David Lambert,NC DEQ
Page 3 of 3
hazenandsawyer.com

Tab A
Application for
Authorization to
Construct Permit

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
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 (except minor modifications) 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, 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.
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 or the funding entity specifies that this requirement does not apply.
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 Town of Siler City
Signature authority's name per 15A NCAC 02T.0106(b) Jack Meadows
Signature authority's title Town Manager
Complete mailing address P.O.Box 769,Siler City,NC 27344
Telephone number 919-726-8627
Email address [e-mail]
B. PROFESSIONAL ENGINEER
Professional Engineer's name J. Brenan Buckley
Professional Engineer's title Associate Vice President
North Carolina Professional Engineer's License No. 025481
Firm name Hazen and Sawyer,P.C.
Firm License number C-0381
Complete mailing address 4011 Westchase Blvd.,Suite 500,Raleigh,NC 27606
Telephone number [phone]
Email address [e-mail]
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 1

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
C. NPDES PERMIT
NPDES Permit number NC0026441
Current Permitted flow(MGD)—include permit Current:4.0 MGD,After future expansion:6.0 MGD
flow phases if applicable
D. PROJECT DESCRIPTION
Provide a brief description of the project: The Siler City WWTP 4 mgd BNR Process Upgrades are required in order to maintain
compliance with the 54,800 lb/year TN limit from 2025 through completion of the 6 mgd expasion.Process upgrades include the
conversion of both oxidation ditches to the 4-stage Bardenpho process. Each oxidation ditch will be converted into a plug flow
operation with baffle walls to form a pre-anoxic,aerobic,post-anoxic,and reaeration zones.The 4-stage Bardenpho process is a
proven technology that allows Siler City to denitrify wastewater and meet TN limits.Process upgrades also include updated
polyaluminum chloride(PACT)dosing pumps and instrumentation and controls to effectively and consistantly meet total
phosphorus limitations.
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.
0 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.
❑ If the project is funded by American Rescue Plan Act(ARPA) funds, please include the ARPA project number in the cover
letter and here
B. 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.
C. Special Order by Consent
® If the facility is subject to any Special Orders by Consent(SOC),submit the applicable SOC.
❑ Not Applicable.
D. Finding of No Significant Impact or Record of Decision
O 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.
O Not Applicable.
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.
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 2

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
® Per 21 NCAC 56.1103(a)(6),the name,address and License number of the Licensee's firm shall be included on each sheet of
the engineering drawings.
® Plans must be labeled as follows:FINAL DRAWING—FOR REVIEW PURPOSES ONLY—NOT RELEASED FOR
CONSTRUCTION.
El 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:
Due to the urgent and temporary nature of the BNR Process Upgrades.redundant NRCY pumps and surface mixers will not be installed in
the basins.A shelf spare of each piece of equipment will be purchased by the contractor and stored onsite for immediate replacement,in the
case of equipment failure. Construction of the 6 mgd expansion will be occuring onsite during the operational period of the BNR Process
Upgrades.If failure of a NRCY pump or mixer were to occur,the contractor will have onsite the means necessary to replace the failed piece
of equipment.Two rental blowers will be provided for each basin.Under annual average operating conditions,only one operational blower
is required to maintain the design dissolved oxygen concentration of 2 mg„/L.The operation of the second blower is only required during
maximum month or peak day conditions.As part of the blower rental agreement with Aerzen,regular preventaive maintance and repairs will
be covered and performed by Aerzen.In the event of equipment failure,Aerzen will be responsible for providing a replacement rental blower.
Dual pumps will be provided for chemical feed systems.
Plans shall include:
® Plans for all applicable disciplines needed for bidding and construction of the proposed project(check as appropriate):
• Civil 0 Not Applicable
El Process Mechanical ❑Not Applicable
® Structural 0 Not Applicable
E) Electrical ❑Not Applicable
El Instrumentation/Controls ❑Not Applicable
❑ Architectural ®Not Applicable
❑ Building Mechanical ®Not Applicable
❑ Building Plumbing ®Not Applicable
El Plan and profile views and associated details of all modified treatment units including piping,valves,and equipment(pumps,
blowers,mixers,diffusers,etc.)
El 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.
El Are any modifications proposed that impact the process flow diagram or process flow schematic of the treatment facility? El
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.
F. E 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.
® 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 ❑Not Applicable
El Process Mechanical Applicable
ec ani 1 ca ❑Not pp
El Structural ❑Not Applicable
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 3

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
El Electrical ❑ Not Applicable
® Instrumentation/Controls ❑Not Applicable
❑ Architectural ®Not Applicable
❑ Building Mechanical El Not Applicable
❑ Building Plumbing El Not Applicable
® 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.
G. 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:The Construction Sequence Plan is
located in specification 01 11 00 Summary of Work and any specification referenced within.
H. Engineering Calculations
El Per 15A 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:
El Demonstration of how peak hour design flow was determined with a justification of the selected peaking factor.
• Influent pollutant loading demonstrating how the design influent characteristics in Section 4.B.2 of this form were determined.
El Pollutant loading for each treatment unit demonstrating how the design effluent concentrations in Section 4.B.2 of this form
were determined.
® Hydraulic loading for each treatment unit.
El Sizing criteria for each treatment unit and associated equipment(blowers,mixers,pumps,etc.)
E1 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.
® Supporting documentation that the specified auxiliary power source is capable of powering all essential treatment units.
I. 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 N/A
Soil Erosion and Sediment Control 11/14/22 CHATH-
2023-004
USCOE /Section 404 Permit N/A
Water Quality Certification (401) N/A
USCOE/Section 10 N/A
Stormwater Management Plan N/A
CAMA N/A
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 4

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
NCDOT Encroachment Agreement N/A
Railroad Encroachment Agreement N/A
Other:
J. Residuals Management Plan
❑ 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 15A NCAC 02T.0504(j)and.0508;the Plan must include:
❑ A detailed explanation as to how the generated residuals (including trash, sediment and grit) will be collected,handled,
processed,stored,treated,and disposed.
❑ An evaluation of the treatment facility's residuals storage requirements based upon the maximum anticipated residuals
production rate and ability to remove residuals.
❑ 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 4 MGD
Current NPDES Permit Limit 4 MGD
Current Annual Average 2.6 MGD
(past 12 months)
For Past 12 Months: For Past 24 Months:
Start Date: 08/2023 Start Date:08/2022
End Date: 07/2024 End Date:07/2024
Maximum Month 3.5 MGD 3.5 MGD
Maximum Day 7.7 MGD 8.7 MGD
Peak Hour Not Available MGD Not Available MGD
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 5

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
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, 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 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 15A NCAC 02T.0105(n): See Section E for discussion reguarding
provisions of redundant NRCY pumps and Mixers
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:
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
Parameter Available [Section 3.H]) [Section 3.H]) Load (monthly average)
<1 mg/L Summer 1 mg/L Summer
Ammonia Nitrogen 24.8 mg/L 30 mg/L 1001 lb/day
NH3-N) <2 mg/L Winter 2 mg/L Winter
Biochemical <5 mg/L Summer 5 mg/L Summer
Oxygen Demand 236 mg/L 350 mg/L 11,676 lb/day
(BOD5) <10 mg/L Winter 10 mg/L Winter
Fecal Coliform <200 per 100 mL 200 per 100 mL
Nitrate+Nitrite
Nitrogen(NO3-N+ N/A mg/L N/A mg/L
NO2-N)
Total Kjeldahl 46 mg/L
Nitrogen
<4.5 mg/L N/A mg/L
Total Nitrogen
<54,800 lb/year 54,800(2025)lb/year
<0.5 (Summer) 0.5 (Summer)
Total Phosphorus 2.4 mg/L 7 mg/L 234 lb/day
<2.0(Winter)mg/L 2.0(Winter)mg/L
N/A lb/year N/A lb/year
Total Suspended 126 mg/L 200 mg/L 6,672 lb/day <30.0 mg/L 30.0 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 :
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 6

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
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:
5. Per 15A NCAC 02T.0505(k),multiple pumps shall be provided wherever pumps are used. Is this condition met by the
design?❑Yes or®No. If no,provide an explanation: Due to the urgent and temporary nature of the BNR Process
Upgrades,redundant NRCY pumps will not be installed in the basins.A shelf spare will be purchased by the contractor and
stored onsite for immediate replacement,in the case of equipment failure. Construction of the 6 mgd expansion will be
occuring onsite during the operational period of the BNR Process Upgrades.If failure of a NRCY pump were to occur,the
contractor will have onsite the means necessary to replace the failed piece of equipment. Redundant pumps will be provided
for chemical feed systems.
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
> Can tolerate septic wastewater due to prolonged detention.
7. Per 15A 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 15A NCAC
02T.105(n): Project does not result in changes to solids production.
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: Project does not modify existing public access.
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 MECHANICAL EQUIPMENT INFORMATION—COMPLETE
FOR NEW OR EXPANDING FACILITIES AND FOR MODIFIED TREATMENT UNITS
1. PRELIMINARY AND PRIMARY TREATMENT(i.e.,physical removal operations and flow equalization):
No.of Plan Sheet Specification Calculatios
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
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 7

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
2. SECONDARY TREATMENT(BIOLOGICAL REACTORS AND CLARIFIERS) (i.e.,biological and chemical
processes to remove orzanics and nutrients)
No.of Plan Sheet Specification Calculation s
Treatment Unit Units Type Size per Unit Reference Reference Provided.
(Yes or No)
1 Aeration and Aeration(per basin):
Aerobic Zones/ 4 1 Re-aeration 1,381,000 gallons,re-aeration: M103 N/A Yes
Tanks zone per basin 273,000 gallons M 104
1 Pre-anoxic Pre-anoxic(per basin):
Anoxic Zones/ and 1 Post- M 103
Tanks 4 anoxic zone 273,000 gal,post-anoxic(per M 104 N/A Yes
per basin basin): 136,000 gallons
Anaerobic gallons
Zones/Tanks
Sequencing Batch
Reactor(SBR) -- gallons
Membrane
Bioreactor(MBR) -- gallons
Secondary Circular ft diameter; ft
Clarifier side water depth
Secondary Rectangular square feet; ft
Clarifier side water depth
Other
3. TERTIARY TREATMENT
No.of Plan Sheet Specification Calculations
Treatment Unit Provided?
Type Size per Unit Reference Reference
Units
- (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 square feet
Filtration
Post-Treatment gallons
Flow Equalization
Post-Aeration gallons
Other
4. DISINFECTION
No.of Plan Sheet Specification Calculations
Treatment Unit Provided?
Units Type Size per Unit Reference Reference
(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
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
L
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 1 1

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 Purpose Type each Blower
Blowers (CFM) Reference Reference
Adjacent to basins 4(2 per Supply air to the Positive displacement 3,200 M104 43 11 33.13
basin) diffuser panels
9. ODOR CONTROL
Location No.of Purpose Type Plan Sheet Specification
Units Reference Reference
u. 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 Design?If"No",identify
Treatment/Storage Setback Waivers in Item D.2
Unit 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
2. Have any setback waivers been obtained per 15A 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❑No. If no,
provide an explanation:
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 12

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
SECTION 5: APPLICATION CERTIFICATION BY PROFESSIONAL ENGINEER
Professional Engineer's Certification per 15A NCAC 02T .0105:
I,J. Brenan Buckley ,attest that this application package for an Authorization to
Construct
(Typed Name of Professional Engineer)
for the Siler City Wastewater Treatment Plant 4 mgd BNR Process Upgrades
(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.1 of this Application. I understand that the Division of Water Resources' issuance of the
Authorization to Construct Permit may be 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
ickage. I further understand that the application package may be subject to a future audit by the Division.Although
:rtain 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:
coo
Q SEAL
025481
e')fNAN 6\C'
Jon Brenan Buckley
2024.10.23 14.39.14-04'00'
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 13

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 1SA NCAC 02T .0106(b):
I, Jack Meadows _,attest that this application package for an Authorization to Construct
(Typed Name of Signature Authority and Title)
for the Siler City Wastewater Treatment Plant 4 mgd BNR Process Upgrades
(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 i 5A
NCAC 02T .0120(b',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. 1 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 fine not to exceed$10,000,as well as civil penalties up to$25,000 per violation.
Signature: Date: /6 ///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 14