NC0085359_Application (ATC)_20221220

UNIONCOUNTY
north carolina
AUTHORIZATION TO CONSTRUCT PERMIT APPLICATION
Twelve Mile Creek Water Reclamation Facility
9.0 mgd Expansion Project
December 20, 2022
Union County Water Prepared By
Engineering Division Hazen and Sawyer
500 North Main Street, Suite 600 9101 Southern Pine
Monroe, NC 28112-4730 Charlotte, NC 28273
[e-mail] [phone]
NC License No. C-0381

THIS PAGE INTENTIONALLY LEFT BLANK

Hazen Hazen and Sawyer
9101 Southern Pine Boulevard, Suite 250
Charlotte, NC 28273•704 357 3150
December 20, 2022
Ms. Min Xiao
North Carolina Division of Water Resources
512 North Salisbury Street
9th Floor—Archdale Building
Raleigh,NC,27604
Re: Union County
Twelve Mile Creek WRF 9.0 mgd Expansion Project
NPDES No.NC0085359
Request for Authorization to Construct
Dear Ms. Xiao:
The enclosed Application for Authorization to Construct Permit(Form ATC-12-14) is for the project
"Twelve Mile Creek WRF 9.0 mgd Expansion". On behalf of Union County,Hazen and Sawyer submits
this letter and enclosures to request Authorization to Construct this project.
This project proposes to expand the Twelve Mile Creek WRF from an initial capacity of 7.5 million
gallons of wastewater(mgd)per day to 9.0 mgd: The facility, located in western Union County,will treat
Union County customers in the surrounding area. Construction is scheduled to begin in late spring 2023.
The scope of construction work includes:
• Influent Pump Station 1 improvements,including addition of diversion pumps.
• New Influent Pump Station 2 to increase total influent pumping capacity.
• New Odor Control - Influent facility to treat foul air from influent facilities.
• New aeration blower provided in the Blower Building.
• MLSS Distribution Box improvements.
• Clarifiers 1-2 and RAS Pump Station A: mechanical rehab and electrical overhaul.
• New Clarifier 4 and New RAS Pump Station B.
• Clarifiers 5-6 and RAS Pump Station C: mechanical rehab and electrical overhaul.
• New standby fan for Odor Control—Solids facility.
• New Chemical Facility to include metal salt solution storage and pumping.
a • New solids pump,piping,valves, and flow meters in Solids Handling Building.
o
The following existing facilities at the Twelve Mile Creek WWTP provide sufficient capacity to
support the proposed expansion to 9.0 mgd with no modifications:
hazenandsawyer.com

Hazen
• Screening Facility: The two(2)existing coarse screens are sized to convey the peak influent
flow rate project at 9.0 mgd rated plant capacity.
• Grit Removal Facility: A new grit removal facility was constructed in the previous plant
expansion project and is sized to accommodate the upgraded capacity.
• Aeration Tanks: The existing aeration tanks were upgraded during the most recent
expansion project and provide adequate process volume to support the additional flow.
• Effluent Filters: The existing cloth disk filters are sized to treat the upgraded capacity.
• UV Disinfection: New UV equipment was installed in the most recent expansion project
with enough capacity for the 9.0 mgd expansion.
In accordance with the ATC Application,the following are included within the submittal package:
• Application for Authorization to Construct Permit(Form ATC-12-14)
• Engineering plans including civil,process mechanical,structural, electrical,and
instrumentation
• Engineering specifications including civil,process mechanical, structural, electrical,and
instrumentation
• NPDES Permit(NC0089630)
• Engineering calculations
• USB with digital PDFs of the above items
Please note the following when reviewing this application:
• Residuals Management Plan: Union County's current agreement with McGill for residuals
disposal is included with this application for reference. A brief summary of the Residuals
Management Plan is included in Section 3J,in accordance with 15A NCAC 02T .0504(j).
• Residuals Storage: The existing digester tanks have sufficient volume to provide 30 days of
liquid residuals storage in addition to the volume required to provide aerobically digested
stabilization,as included in the design calculations provided with this application.
Thank you for your consideration of this application. If you have any questions or need any additional
information to complete your review,please do not hesitate to contact me at 704-649-7080 or via email at
[e-mail].
Very truly yours,
401417 R..
Michael Parker, PE
Senior Associate
Cc: Grant Moore(Union County)
Page 2 of 2
hazenandsawyer.com

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
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. 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.
C. The plans and specifications submitted must represent a completed final design that is ready to advertise for bid.
D. Any content changes made to this Form ATC-12-14 shall result in the application package being returned.
E. 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.
F. Check the boxes below to indicate that the information is provided and the requirements are met.
G. If attachments are necessary for clarity or due to space limitations, such attachments are considered pert of the application
package and must be numbered to correspond to the item referenced.
H. 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.
For more information,visit the Division of Water Resources web site at:https://deq.nc.gov/about/divisions/water-resources/water-
resources-permits/wastewater-branch/npdes-wastewater/authorization-to-construct.
J. 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 Union County Water
Signature authority's name per 15A NCAC 02T.0106(b) John Shutak
Signature authority's title Engineering Division Director
Complete mailing address 500 North Main Street,Suite 600, Monroe, NC 28112-4730
Telephone number 704-283-3651
Email address [e-mail]
B. PROFESSIONAL ENGINEER
Professional Engineer's name Michael Parker
Professional Engineer's title Associate Vice President
North Carolina Professional Engineer's License No. 026432
Firm name Hazen and Sawyer
Firm License number C-0381
Complete mailing address 9101 Southern Pine Blvd,Suite 250, Charlotte, NC 28273
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 1

State of North Carolina
Department of Environmental Quality
Division of Water Resources
tl,r,*(I h'cc,u ((.
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
Telephone number 704-649-7080
Email address [e-mail]
C. NPDES PERMIT
NPDES Permit number NC0085359
Current Permitted flow(MGD)—include permit
flow phases if applicable 7.5 MGD
D. PROJECT DESCRIPTION
Provide a brief description of the project:The project includes new and modified facilities at the Twelve Mile Creek Wastewater
Reclamation Facility(WRF)to support expansion of the rated plant capacity from 7.5 MGD to 9.0 MGD.The new facilities
include an influent pump station, odor control facility, one aeration blower, one secondary clarifier, return activated sludge
(RAS) pump station, metal salts chemical facility, and other miscellaneous improvements. The WRF is located in Waxhaw, NC in
southwestern Union County along the Twelve Mile Creek.
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.
❑ 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. 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
❑ 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-12-14) Page 2

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
E. 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 56.1103(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.
® 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 ❑ Not Applicable
® Process Mechanical ❑ Not Applicable
® Structural ❑ Not Applicable
® Electrical ❑ Not Applicable
® Instrumentation/Controls ❑ Not Applicable
❑ Architectural ® Not Applicable
❑ Building Mechanical ® Not Applicable
❑ 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.
F. ® 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
® Process Mechanical ❑ Not Applicable
® Structural ❑ Not Applicable
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 3

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
® Electrical ❑ Not Applicable
® Instrumentation/Controls ❑ Not Applicable
❑ Architectural ® Not Applicable
LI Building Mechanical ® Not Applicable
❑ Building Plumbing ® 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:Spec 01 14 00(1.06)
H. Engineering Calculations
® Per 15A NCAC 02T.0504(c)(3),submit one set of engineering calculations that have been signed,sealed and dated by a Nor
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 influent 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.
® Hydraulic loading for each treatment unit.
® 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.
® 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 x - - - -
Soil Erosion and Sediment Control - Dec.2022 - - -
USCOE /Section 404 Permit - Dec. 2022 -
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 4

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
CNVIRONMCNTAL DUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
Water Quality Certification (401) - Dec. 2022 - - -
USCOE/Section 10 - - - - -
Stormwater Management Plan - - - - -
CAMA - - - - -
NCDOT Encroachment Agreement - - - - -
Railroad Encroachment Agreement - - - - -
Other: Floodplain Development
Dec. 2022
Permit
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 15A NCAC 02T
.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.
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 5

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
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 7.5
Current NPDES Permit Limit 7.5 MGD
Current Annual Average
(past 12 months) 5.82 mgd
For Past 12 Months: For Past 24 Months:
Start Date:Jan 2022 Start Date:Jan 2021
End Date: Dec 2022 End Date: Dec 2022
Maximum Month 6.67 7.8
Maximum Day 12.58 12.58
Peak Hour [not available] [not available]
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 6

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resouri es
ENVIRONMENTAL oui 1 TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
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):
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
Design Influent Design Influent
Influent Concentration Load
Concentration- (Must be (Must be
Current Annual supported by supported by
Average(past Engineering Engineering Design Effluent
12 months)if Calculations Calculations Concentration and/or NPDES Permit Limits
Parameter Available [Section 3.H]) [Section 3.H]) Load (monthly average)
mmonia Nitrogen 1 mg/L Summer 1 mg/L Summer
31 35 mg/L 2,190 lb/day
1H3-N)
1 mg/L Winter 2 mg/L Winter
Biochemical 5 mg/L Summer 5 mg/L Summer
Oxygen Demand 236.7 275 mg/L 17,140 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 + 9.3 mg/L Not Permitted
NO2-N)
Total Kjeldahl
42.6
Nitrogen
12.4 mg/L Not Permitted
Total Nitrogen
N/A Not Permitted
<0.75 mg/L N/A
Total Phosphorus 2.3 7.0 mg/L 440 lb/day
41.7 lb/yr 41.7 lb/yr
Total Suspended 213.2 310 mg/L 18,450 lb/day 30 mg/L • 30 mg/L
'Ads(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-12-14) Page 7

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
4. Per 15A NCAC 02T.0505(i), 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:
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 1SA 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):
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: Fencing is around the permitter of the plant with restricted entry gates at each
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 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 Calculations
Treatment Unit Type Size per Unit Provided?
Units Reference Reference (Yes or No)
Manual Bar Screen N/A
N/A N/A
N/A N/A
Flow Equalization N/A
Primary Clarifier N/A
Primary Clarifier N/A
Other N/A
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 8

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QU!,L TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
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 Type Size per Unit Provided?
Units Reference Reference
(Yes or No)
Aerobic Zones/ N/A
Tanks
Anoxic Zones/ N/A
Tanks
Anaerobic N/A
Zones/Tanks
Sequencing Batch N/A
Reactor(SBR)
Membrane N/A
Bioreactor(MBR)
(See calculations) M410 Series,
Secondary Clarifier 5 Circular 2x 70-ft diam, 2x 85-ft diam, M440 Series, 46 43 21.13 Yes
lx 100-ft diam M450 Series
Secondary Clarifier N/A
Other N/A
3. TERTIARY TREATMENT
No. of Plan Sheet Specification Calculations
Treatment Unit Type Size per Unit Provided?
Units Reference Reference
(Yes or No)
Tertiary Clarifier N/A
Tertiary Clarifier N/A
Tertiary Filter N/A
Tertiary Membrane N/A
Filtration
Post-Treatment N/A
Flow Equalization
Post-Aeration N/A
Other N/A
4. DISINFECTION
No. of Plan Sheet Specification Calculations
Treatment Unit Type Size per Unit Provided?
Units Reference Reference
(Yes or No)
Ultraviolet Light N/A
Ultraviolet Light N/A
Chlorination N/A
5. RESIDUALS TREATMENT
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 9

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
No.of Plan Sheet Specification Calculations
Treatment Unit Type Size per Unit Provided?
Units Reference Reference
(Yes or No)
Gravity Thickening N/A
Tank
Mechanical N/A
Thickening/
Dewatering
Aerobic Digestion N/A
Anaerobic N/A
Digestion
Composting N/A
Drying N/A
Other N/A
6. PUMP SYSTEMS(include influent, intermediate, effluent, major recycles,waste sludge,thickened waste sludge and plant
drain pumps)
Capacity of
Location No.of Purpose Type each pump Plan Sheet Specificati^^
Pumps I Reference Referent
GPM TDH
e
Influent Pump 2 Influent Pumping Submersible Solids 4,305 129 M150-M153 43 25 13
Station 1 Handling
Influent Pump Submersible Solids
-
2 Diversion Pumping 1,260 258 M150-M153 43 25 13
Station 1 Handling
Influent Pump 1 Influent Pumping Submersible Solids 4,000 113 M160-M166 43 25 13
Station 2 (Smaller Pump) Handling
Influent Pump Submersible Solids
-
2 Influent Pumping 5,500 117 M160-M166 43 25 13
Station 2 Handling
RAS Pump Station B 2 RAS Pumping Submersible Solids- 2,407 42 M480-M482 43 25 13
Handling
Peristaltic Hose
Chemical Facility 3 Metal Salts Feed 0.4 138 M740-M742 46 33 45
Metering Pump
Magnetic Drive
Chemical Facility 1 Metal Salts Transfer Centrifugal 50 30 M740-M742 46 33 67
Chemical Facility 2 Metal Salts Submersible Chem 25 15 M740-M742 43 25 18
Containment Drain Sump Pump
Solids Handling 1 WAS Blending Progressive Cavity 300 45 M850, M851 43 23 57
Building
7. MIXERS
No. of Power of Plan Sheet Specification
Location Purpose Type each Mixer
Mixers (HP) Reference Reference
MLSS Distribution Maintain solids in
3 Vertical Turbine 1 M400-M404 46 41 27.
Box suspension
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 10

State of North Carolina
• Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONKENTAL QUALTY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
8. BLOWERS
No.of Capacity of Plan Sheet Specification
Location Purpose Type each Blower
Blowers (CFM) Reference Reference
Diffused aeration
Integrally Geared
Blower Facility 1 for the basins Single Stage 6,067 M300 43 11 12
Centrifugal
9. ODOR CONTROL
No.of Plan Sheet Specification
Location Purpose Type
Units Reference Reference
Adjacent to 1 Treat Odors from Bio-Trickling Filter M140-142 44 31 31
Screening Facility Influent Facilities
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:
Is Minimum Distance
Minimum Distance
Required from Nearest Requirement met by the
Setback Parameter Design? If"No",identify
Treatment/Storage
Unit Setback Waivers in Item D.2
Below
Any habitable residence or place of assembly under separate
ownership or not to be maintained as part of the project site 100 ft ®Yes n No
Any private or public water supply source 100 ft ®Yes [1 No
Surface waters(streams—intermittent and perennial, perennial
waterbodies, and wetlands) 50 ft ®Yes n No
Any well with exception of monitoring wells 100 ft ®Yes No
Any property line 50 ft ®Yes n No
2. Have any setback waivers been obtained per 15A NCAC 02T .0506(d)? U 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? I I Yes or n No. If
no, provide an explanation:
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 11
1

a
Department of
State Environof mNorth entalCarolin Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QU.AL'TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
SECTION 5: APPLICATION CERTIFICATION BY PROFESSIONAL ENGINEER
Professional Engineer's Certification per 15A NCAC 02T.0105:
application acka a for an Authorization to Construct
I, Michael Parker, attest that this
package
(Typed Name of Professional Engineer)
for the Twelve Mile Creek WRF 9.0 MGD Expansion
(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 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:
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 12

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
SECTION 6: APPLICATION CERTIFICATION BY APPLICANT
Applicant's Certification per 15A NCAC 02T .0106(b):
1 John Shutak, Engineering Division Director , attest that this application package for an Authorization to Construct
(Typed Name of Signature Authority and Title)
for the Twelve Mile Creek WRF 9.0 MGD Expansion
(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(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
3y waive the technical review of the plans, specifications, calculations and other supporting documentation provided
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 fine to exceed $10,000, as well as civil penalties up to $25,000 per violation.
Signature: Date: December 14, 2022
Engineering Division Director
l�
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-12-14) Page 14

THIS PAGE INTENTIONALLY LEFT BLANK

ATTACHMENT 3B
NPDES PERMIT

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
TATE
� I
it a
ft,
ROY COOPER =34I •
Governor iN
DIONNE DELLI-GATTI a•
Secretary �� ��
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
May 28, 2021
Mr. Andrew Neff, P.E.
Water and Wastewater Division Director
Union County Public Works
4600 Goldmine Road
Monroe,North Carolina 28112
Subject: Final NPDES Permit Renewal
Permit NC0085359
Twelve Mile Creek WRF
Union County
Grade IV Biological WPCS
SIC Code 4952
Dear Mr. Neff:
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly,we are forwarding the attached NPDES permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement
between North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007
(or as subsequently amended).
Please note that the receiving stream is listed as impaired for Fish Community and Turbidity on
the North Carolina 2018 303(d) Impaired Waters List. Addressing impaired waters is a high
priority with the Division, and instream data will continue to be evaluated. If there is
noncompliance with permitted effluent limits and stream impairment can be attributed to your
facility, then mitigative measures may be required.
No changes were made to the draft permit sent to you on February 16, 2021.
The final permit maintains the following significant changes identified in the letter sent on
February 16,2021:
• A typographical error regarding the monitoring frequencies for total phosphorous and
total nitrogen in Sections A.(1.)through A.(3.)has been corrected.
• A typographical error has been corrected in the header to Section A.(3.).
• Special Condition A.(8.)has been corrected to reference total zinc instead of total silver.
• The facility components list in the supplement to cover has been updated for accuracy.
Per request by the County, CBOD5 limits have replaced BOD5 limits [See A.(1.)—A.(3.)].
• As the Division has received a signed Engineer's Certificate indication construction has
been completed under ATC No. 085359A07, the 6.0 MGD flow tier has been removed
from the permit and the facility is under operation at the 7.5 MGD flow tier [See A.(1.)].
• Per the Name/Ownership Change Request received on November 23, 2020,the facility
name has been changed from "Twelve Mile Creek WWTP" to"Twelve Mile Creek
WRF."
- v North Carolina Department of Environmental Quality I Division of Water Resources
512 North SalisburyStreet 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
Osirlrod�DEQ� 9
� /"� 919.707.9000

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
• Based on the 2012 Statewide Mercury TMDL implementation guidance, Special
Condition A.(9.)Mercury Minimization Plan has been removed from the permit.
• Based on the reasonable potential analysis (RPA)showing reasonable potential to violate
state water quality standards based on a limited data set, quarterly monitoring for total
cadmium has been added to the permit [See A.(1.), A.(.2), and A.(3.)].
• Based on review of instream monitoring data,the Division has removed sampling
requirements at the location"one quarter mile downstream from the outfall, before
confluence with the first tributary" [See A.(1.), A.(.2), and A.(3.)].
• Some of the wording has changed in Special Condition A.(4.), Chronic Toxicity Permit
Limit,please review each paragraph carefully.
• As the Division is moving to accept data electronically through the eDMR system, the
requirement to submit physical nutrient worksheets has been removed from the permit.
The Permittee shall continue to report Monthly Average Total Phosphorous and 12-
Month Mass Average Loading Total Phosphorous via the Division's eDMR system [See
Special Condition A.(5.)]
• To provide verification of the site-specific criteria for copper and silver developed as a
result of the County's 2005/2006 Water Effect Ratio study, Special Condition A.(8.)
Water Effect Ratio Confirmation Study has been added to the permit.
• Special Condition A.(3.)has been modified to include the specific three years in which
the Effluent Pollutant Scan shall be performed(2022, 2023, and 2024). In addition, at the
end of the Special Condition, 2nd species Toxicity Testing Requirements for municipal
permit renewals per Federal Regulations [40 CFR 122.21(j)(5)] have been added. As
such, Special Condition A.(10.)Additional Toxicity Testing Requirements for Municipal
Permit Renewal has been removed from the permit.
• A notation was made concerning the Electronic Reporting Rule—Phase 2 Extension.
EPA has extended the Phase 2 deadline from December 21, 2020,to December 21,2025
[See Special Condition A.(7.)]
• Parameter codes have been added to the Effluent Limitations and Monitoring
Requirements [ See A.(1.), A.(.2), and A.(3.)].
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-
6714). Unless such demand is made,this decision shall be final and binding.
The NPDES standard conditions (Parts II, III, and IV) are the same as in your current permit
except that agency and division names have been updated. The latest version is available at
https://bit.ly/3k5NFaL and can be viewed online or downloaded as a PDF file.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect
the legal requirements to obtain other permits which may be required by the Division of Water
Resources or any other Federal, State, or Local governmental regulations.
If you have any questions concerning this permit,please contact Nick Coco at(919) 707-3609 or
via email at [e-mail].
Page 2 of 3

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
Sincerely,
—nn DocuSigned by: ��,^�``t•� 'w,. I'''�`,
r V W tAkkilt
"—C464531431644FE_.
for S. Daniel Smith, Director
Division of Water Resources,NCDEQ
Hardcopy: NPDES Files
Central Files
Ecopy: US EPA Region 4
DWR/Mooresville Regional Office/Water Quality/Corey Basinger
DWR/Aquatic Toxicology Branch/Cindy Moore and Zach Thomas
SCDHEC/DWQ/303(d), Modeling & TMDL Manager/Wade Cantrell
SCDHEC/Domestic Wastewater Permitting Section/Brenda Green
Page 3 of 3

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
Permit NC0085359
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, the
Union County Public Works
is hereby authorized to discharge wastewater from a facility located at the
Twelve Mile Creek Water Reclamation Facility
8299 Kensington Drive
Waxhaw
Union County
to receiving waters designated as Twelve Mile Creek in the Catawba River Basin
in accordance with the effluent limitations,monitoring requirements,and other applicable conditions
set forth in Parts I,II,III,and IV hereof.
This permit shall become effective July 1,2021.
This permit and authorization to discharge shall expire at midnight on December 31,2025.
Signed this day May 28,2021.
DocuSigned by: A ` y �.''A
IVY J. ketittaft
•
C464531431644FE...
for S.Daniel Smith, Director
Division of Water Resources
By Authority of the Environmental Management Commission

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
Permit NC0085359
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 authorityto operate and discharge from this facilityarises under the permit conditions, requirements,
terms, and provisions included herein.
The Union County Public Works
is hereby authorized to:
1. Continue to operate and maintain an existing 7.5 MGD wastewater treatment facility consisting of
the following components:
• Mechanical Bar Screens
• Influent pump station with stand-by generator
• Vortex grit tanks
• Carbon odor control facility
• Biological Nutrient Removal (BNR) Distribution Box
• Four(4) BNR basins with anaerobic,anoxic and aerobic zones
• Blower building with standby generator
• MLSS distribution box
• Sodium Aluminate storage and feed facilities for chemical phosphorous trim
• Four(4)final clarifiers
• Three(3)disc filters
• One(1)UV disinfection facility
• Cascade post aeration
• Thickening/Dewatering facility [Two (2) gravity belt thickeners and two (2)belt filter presses]
• Four aerobic digesters with jet aeration
• 2-stage wet scrubber odor control facility
• Main plant standby generator
This facility is located at the Twelve Mile Creek Water Reclamation Facility,8299 Kensington Drive,
Waxhaw,Union County,and
2. Upon issuance of an Authorization to Construct (ATC) permit by the Division and submission of
the Engineer's Certification for construction completion,operate a wastewater treatment facility up
to a design flow of 9 MGD,and
3. Upon issuance of an Authorization to Construct (ATC) permit by the Division and submission of
the Engineer's Certification for construction completion, operate a wastewater treatment facility up
to a design flow of 12 MGD,and
4. Discharge from said treatment works at the location specified on the attached map via Outfall 001
into Twelve Mile Creek,classified C waters in the Catawba River Basin.
Page 2 of 13

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
Permit NC0085359
PARTI
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [7.5 MGD]
[15A NCAC 02B .0400 et seq.,15A NCACO2B .0500 et seq.] Grade IV
Biological Water Pollution Control System [15A NCAC 08G .0302]
a. During the period beginning on the effective date of the permit and lasting until expansion above
7.5 MGD or permit expiration, whichever comes first,the permittee is authorized to discharge
treated municipal wastewater from Outfall 001. Such discharges shall be limited and monitored)
by the permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER
Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location2
Flow 50050 7.5 MGD Continuous Recording I or E
CBOD, 5 day, 20°C3 80082 5.0 mg/L 7.5 mg/L 2/week4 Composite I and E
(March 1-October 31)
CBOD, 5 day, 20°C3 80082 10.0 mg/L 15.0 mg/L 2/week4 Composite I and E
(November 1- February 28/29)
Total Suspended Solids3 C0530 30.0 mg/L 45.0 mg/L 2/week4 Composite I and E
NH3as N C0610 1.0 mg/L 3.0 mg/L 2/week4 Composite
E
(March 1-October 31)
NH3 as N C0610 2.0 mg/L 6.0 mg/L 2/week4 Composite E
(November 1- February 28/29)
Fecal Coliform 31616 200/100 mL 400/100 mL 2/week4 Grab E
(geometric mean)
Dissolved Oxygen 00300 Daily Average >_ 6.0 mg/L Daily Grab E
pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab E
Temperature°C 00010 Monitor and Report Daily Grab E
Total Phosphoruss RM665 Monthly Average: 41.70 pounds/day Monthly Composite E
RA665 12 Month Average: 20.85 pounds/day
Total Nitrogen (mg/L) CO600 Monitor and Report Monthly Calculated E
Total Cadmium(pg/L) 01027 Monitor and Report Quarterly Composite E
Chronic Toxicity6 TGP38 Monitor and Report Quarterly Composite E
Pollutant Scan7 NC01 Monitor and Report Footnote 7 Footnote 7 E
Dissolved Oxygen (mg/L) 00300 Monitor and Report Variable2 Grab U and D
Temperature°C 00010 Monitor and Report Variable2 Grab U and D
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. See Special
Condition A.(7.).
2. Sample locations I-Influent,E-Effluent,U-Upstream=at least 50 feet upstream from the outfall,D-Downstream=at NCSR 1301.
Upstream and downstream samples shall be grab samples collected 3/week during June,July,August,and September and
1/week during the remainder of the year.Additional downstream dissolved oxygen monitoring is recommended to provide DO
stream profile of Twelve Mile Creek in North Carolina and South Carolina.
3. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15%of the respective influent
value(85%removal).
4. Twice per week sampling must occur on any two non-consecutive days during the calendar week.
5. Special Condition A.(5.)describes the methodology for calculation of the monthly average and 12-month limits.
6. Chronic Toxicity(Ceriodaphnia duhia)P/F at 90%with testing in February,May,August,and November.See Special Condition
A.(4.).
7. The permittee shall perform three effluent pollution scans during the term of this permit.See Special Condition A.(6.).
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 3 of 13

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
Permit NC0085359
A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [9.0 MGD]
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade IV
Biological Water Pollution Control System [15A NCAC 08G .0302]
a. Beginning upon receipt of the Engineer's Certification for completion of the expansion to 9.0
MGD and lasting until expansion above 9.0 MGD or permit expiration, whichever comes first, the
Permittee is authorized to discharge treated wastewater from Outfall 001. Such discharges shall
be limited and monitored' by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER
Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location2
Flow 50050 9.0 MGD Continuous Recording I or E
CBOD, 5 day, 20°C3 80082 5.0 mg/L 7.5 mg/L 2/week4 Composite
(March 1-October 31) g g I and E
CBOD, 5 day, 20°C3 80082 10.0 mg/L 15.0 mg/L 2/week4 Composite I and E
(November 1- February 28/29)
Total Suspended Solids3 CO530 30.0 mg/L 45.0 mg/L 2/week4 Composite I and E
NH3 as N CO610
(March 1 October 31) 1.0 mg/L 3.0 mg/L 2/week4 Composite E
NH3 as N CO610 2.0 mg/L 6.0 mg/L 2/week4 Composite E
(November 1-February 28/29)
Fecal Coliform 31616 200/100 mL 400/100 mL 2/week4 Grab E
(geometric mean)
Dissolved Oxygen 00300 Daily Average >_ 6.0 mg/L Daily Grab E
pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab E
Temperature°C 00010 Monitor and Report Daily Grab E
s RM665 Monthly Average: 41.70 pounds/day
Total Phosphorus Monthly Composite E
RA665 12 Month Average: 20.85 pounds/day
Total Nitrogen (mg/L) CO600 Monitor and Report Monthly Calculated E
Total Cadmium(pg/L) 01027 Monitor and Report Quarterly Composite E
Chronic Toxicity6 TGP3B Monitor and Report Quarterly Composite E
Pollutant Scan7 NC01 Monitor and Report Footnote 7 Footnote 7 E
Dissolved Oxygen (mg/L) 00300 Monitor and Report Variablez Grab U and D
Temperature°C 00010 Monitor and Report Variablez Grab U and D
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. See Special
Condition A.(7.).
2. Sample locations I-Influent,E-Effluent,U-Upstream=at least 50 feet upstream from the outfall,D-Downstream=at NCSR 1301.
Upstream and downstream samples shall be grab samples collected 3/week during June,July,August,and September and
1/week during the remainder of the year.Additional downstream dissolved oxygen monitoring is recommended to provide DO
stream profile of Twelve Mile Creek in North Carolina and South Carolina.
3. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15%of the respective influent
value(85%removal).
4. Upon expansion above 7.5 MGD,the County shall revert back to daily sampling of these parameters.After 6 months of daily
sampling,the Permittee may return to twice per week sampling for the parameters for which no permit limit violations have
occurred.Twice per week sampling must occur on any two non-consecutive days during the calendar week.
5. Special Condition A.(5.)describes the methodology for calculation of the monthly average and 12-month limits.
6. Chronic Toxicity(Ceriodaphnia duhia)P/F at 90%with testing in February,May,August,and November.See Special Condition
A.(4.).
7. The permittee shall perform three effluent pollution scans during the term of this permit.See Special Condition A.(6.).
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 13

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
Permit NC0085359
A.(3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [12.0 MGD]
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade IV
Biological Water Pollution Control System [15A NCAC 08G .0302]
a. Beginning upon receipt of the Engineer's Certification for completion of the expansion to 12.0
MGD and lasting until permit expiration, the Permittee is authorized to discharge treated
wastewater from Outfall 001. Such discharges shall be limited and monitored"' by the Permittee as
specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER
Monthly Weekly Daily Measurement Sample Sample
Parameter Code 2
Average Average Maximum Frequency Type Location
Flow 50050 12.0 MGD Continuous Recording I or E
CBOD, 5 day, 20°C3 80082 5.0 mg/L 7.5 mg/L 2/week4 Composite I and E
(March 1-October 31)
CBOD, 5 day, 20°C3 80082 10.0 mg/L 15.0 mg/L 2/week4 Composite I and E
(November 1- February 28/29)
Total Suspended Solids3 C0530 30.0 mg/L 45.0 mg/L 2/week4 Composite I and E
NH3as N C0610 1.0 mg/L 3.0 mg/L 2/week4 Composite
E
(March 1-October 31)
NH3 as N CO610 2.0 mg/L 6.0 mg/L 2/week4 Composite E
(November 1-February 28/29)
Fecal Coliform 316.16 200/100 mL 400/100 mL 2/week4 Grab E
(geometric mean)
Dissolved Oxygen 00300 Daily Average >_ 6.0 mg/L Daily Grab E
pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab E
Temperature°C 00010 Monitor and Report Daily Grab E
Total Phosphorus RM665 Monthly Average:41.70 pounds/day Monthly Composite E
RA665 12 Month Average: 20.85 pounds/day
Total Nitrogen (mg/L) CO600 Monitor and Report Monthly Calculated E
Total Cadmium(pg/L) 01027 Monitor and Report Quarterly Composite E
Chronic Toxicity6 TGP3B Monitor and Report Quarterly Composite E
Pollutant Scan7 NC01 Monitor and Report Footnote 7 Footnote 7 E
Dissolved Oxygen (mg/L) 00300 Monitor and Report Variable2 Grab U and D
Temperature°C 00010 Monitor and Report Variable2 Grab U and D
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. See Special
Condition A.(7.).
2. Sample locations I-Influent,E-Effluent,U-Upstream=at least 50 feet upstream from the outfall,D-Downstream=at NCSR 1301.
Upstream and downstream samples shall he grab samples collected 3/week during June,July,August,and September and
1/week during the remainder of the year.Additional downstream dissolved oxygen monitoring is recommended to provide DO
stream profile of Twelve Mile Creek in North Carolina and South Carolina.
3. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15%of the respective influent
value(85%removal).
4. Upon expansion above 9.0 MGD,the County shall revert back to daily sampling of these parameters.After 6 months of daily
sampling,the Permittee may return to twice per week sampling for the parameters for which no permit limit violations have
occurred.Twice per week sampling must occur on any two non-consecutive days during the calendar week.
5. Special Condition A.(5.)describes the methodology for calculation of the monthly average and 12-month limits.
6. Chronic Toxicity(Ceriodaphnia dubia)P/F at 90%with testing in February,May,August,and November.See Special Condition
A.(4.).
7. The permittee shall perform three effluent pollution scans during the term of this permit.See Special Condition A.(6.).
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 5 of 13

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
Permit NC0085359
A.(4.) CHRONIC TOXICITY PERMIT LIMIT(QUARTERLY)
[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 90%at 7.5 MGD,9.0 MGD and 12.0
MGD flow.
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
February,May,August,and November.These months signify the first month of each three-month
toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained
during representative effluent discharge and shall be performed at the NPDES permitted final effluent
discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV
below the permit limit,then multiple-concentration testing shall be performed at a minimum,in
each of the two following months as described in"North Carolina Phase II Chronic Whole Effluent
Toxicity Test Procedure" (Revised-December 2010) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered electronically using
the Division's eDMR system for the month in which tests were performed,using the parameter code
TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally,DWR Form AT-3
(original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
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.
Page 6 of 13

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
Permit NC0085359
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
g g P
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.
A.(5.) TOTAL PHOSPHOROUS (TP) MONITORING
[G.S. 143-215.1(b)]
The Permittee shall calculate a 12-month rolling average mass loading as the sum of monthly loadings,
according to the following equations:
(1) Monthly Average(pounds/day) =TP x Qw x 8.34
Where:
TP= the arithmetic average of total phosphorus concentrations(mg/L) obtained via composite samples
(either daily,weekly,or monthly average values)collected during the month
Qw =the average daily waste flow(MGD) for the month
8.34=conversion factor,from(mg/L x MGD) to pounds
The 12-month rolling average mass loading is defined as the sum.of the monthly average loadings for
the previous 12 months inclusive of the reporting month:
12
ITPma=12
(2) 12-Month Average Mass Loading(pounds/day)= 1 (inclusive of reporting month)
Where:
TPma is defined as the total phosphorus monthly average mass loading (calculated above).
The monthly average and 12-month average mass loadings shall be reported electronically using the
Division's eDMR system for Twelve Mile Creek WWTP.
The Permittee shall report the TP concentration for each sample electronically using the Division's
eDMR system. Reporting of and compliance with the TP limit shall be done on a monthly basis.
Page 7 of 13

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
Permit NC0085359
A.(6.) EFFLUENT POLLUTANT SCAN (Municipal POTWs)
[G.S. 143-215.1(b)]
a. The Permittee shall perform a total of three(3) Effluent Pollutant Scans for all parameters listed
below. One scan must be performed in each of the following years: 2022,2023,and 2024.
Analytical methods shall be in accordance with 40 CF1(Part 136 and shall be sufficiently sensitive
to determine whether parameters are present in concentrations greater than applicable standards
and criteria. Samples should be collected with one quarterly toxicity test each year,and must
represent seasonal variation [i.e., do not sample in the same quarter every year]. Unless
otherwise indicated,metals shall be analyzed as"total recoverable."
Ammonia(as N) C0610 34546 Bis 2-chloroeth )
Trans-1 2-dichloroeth lene 1 ether 34273
Y Y
Chlorine(total residual,TRC) 50060 1,1-dichloroethylene 34501 Bis(2-chloroisopropyl)ether 34283
Dissolved oxygen 00300 1,2-dichloropropane C0541 Bis(2-ethylhexyl)phthalate CO100
Nitrate/Nitrite 00630 1,3-dichloropropylene 77163 4-bromophenyl phenyl ether 34636
Kjeldahl nitrogen 00625 Ethylbenzene 34371 Butyl benzyl phthalate 34292
Oil and grease 00556 Methyl bromide 34413 2-chloronaphthalene 34581
Phosphorus C0665 Methyl chloride 34418 4-chlorophenyl phenyl ether 34641
Total dissolved solids 70295 Methylene chloride 34423 Chrysene 34320
Hardness 00900 1,1,2,2-tetrachloroethane 81549 Di-n-butyl phthalate 39110
Antimony 01097 Tetrachloroethylene 34475 Di-n-octyl phthalate 34596
Arsenic 01002 Toluene 34010 Dibenzo(a,h)anthracene 34556
Beryllium 01012 1,1,1-trichloroethane 34506 1,2-dichlorobenzene 34536
Cadmium 01027 1,1,2-trichloroethane 34511 1,3-dichlorobenzene 34566
Chromium C0034 ' Trichloroethylene 39180 1,4-dichlorobenzene 34571
Copper 01042 Vinyl chloride 39175. 3,3-dichlorobenzidine 34631
Lead 01051 Acid-extractable compounds: Diethyl phthalate 34336
Mercury(Method 1631E) COMER P-chloro-m-cresol 34452 Dimethyl phthalate 34341
Nickel 01067 2-chlorophenol 34586 2,4-d nitrotoluene 34611
Selenium 01147 2,4-dichlorophenol 34601 2,6-dinitrotoluene C0626
Silver 01077 2,4-dimethylphenol 34606 1,2-diphenylhydrazine 34346
Thallium 01059 4,6-dinitro-o-cresol 34657 Fluoranthene C0376
Zinc 01092 2,4-dinitrophenol 34616 Fluorene 34381
Cyanide 00720 2-nitrophenol 34591 Hexachlorobenzene C0700
Total phenolic compounds 32730 4-nitrophenol 34646 Hexachlorobutadiene C0702
Volatile organic compounds: Pentachlorophenol 39032 Hexachlorocyclo-pentadiene 34386
Acrolein 34210 Phenol 34694 Hexachloroethane 34396
Acrylonitrile 34215 2,4,6-trichlorophenol 34621 Indeno(1,2,3-cd)pyrene 34403
Benzene 34030 Base-neutral compounds: Isophorone 34408
Bromoform 32104 Acenaphthene 34205 Naphthalene 34696
Carbon tetrachloride 32102 Acenaphthylene 34200 Nitrobenzene 34447
Chlorobenzene 34301 Anthracene CO220 N-nitrosodi-n-propylamine 34428
Chlorodibromomethane 34306 Benzidine 39120 N-nitrosodimethylamine 34438
Chloroethane 85811 Benzo(a)anthracene C0526 N-nitrosodiphenylamine 34433
2-chloroethyl vinyl ether 34576 Benzo(a)pyrene 34247 Phenanthrene 34461
Chloroform •32106 3,4 benzofluoranthene 34230 Pyrene 34469
Dichlorobromomethane 32101 Benzo(ghi)perylene 34521 1,2,4-trichlorobenzene C0551
1,1-dichloroethane 34496 Benzo(k)fluoranthene 34242
1,2-dichloroethane 32103 Bis(2-chloroethoxy)methane 34278
b. Reporting. Test results shall be reported electronically using the Division's eDMR system or on
DWR Form DMR-PPA-1(or on a form approved by the Director)by December 31st of each
designated sampling year.
Page 8 of 13

DocuSign Envelope ID.9CF9B540-72EA-41FD-B6EB-B89D08459F96
Permit NC0085359
c. The Permittee must at least report completion of the test in the eDMR system by entering"1" or
"Y" for parameter code NC01 -Annual Pollutant Scan. If utilizing the DWR Form submit to the
following address:
NC DEQ/DWR/NPDES Files,1617 Mail Service Center,Raleigh, North Carolina 27699-1617.
Or the form may be uploaded at:https://edocs.deq.nc.gov/Forms/NPDES WW-EDMR-
Supplemental-Form
d. Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that
Municipal facilities that are subject to the Effluent Pollutant Scan requirements listed above are
also subject to additional toxicity testing requirements specified in Federal Regulation 40 CFR
122.21(j)(5). The US EPA requires four (4) toxicity tests for a test organism other than the test
species currently required in this permit. The multiple species tests should be conducted either
quarterly for a 12-month period prior to submittal of the permit renewal application,or four tests
performed at least annually in the four and one half year period prior to the application. These
tests shall be performed for acute or chronic toxicity,whichever is specified in this permit. The
multiple species toxicityy test results shall be filed with the Aquatic Toxicology Branch at the
following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
Or,results can be sent to the email, ATForms.ATB@ncdenr. ov.
g
Contact the Division's Aquatic Toxicology Branch at 919-743-8401 for guidance on conducting
the additional toxicity tests and reporting requirements. Results should also be summarized in
Part E (Toxicity Testing Data) of EPA Municipal Application Form 2A,when submitting the
permit renewal application to the NPDES Permitting Unit.
A.(7.) ELECTRONIC REPORTING OF MONITORING REPORTS
[G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports(DMRs) and
program reports.The final NPDES Electronic Reporting Rule was adopted and became effective on
December 21,2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of
this permit(Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
Page 9 of 13

DocuSign Envelope ID 9CF9B540-72EA-41FD-B6EB-B89D08459F96
Permit NC0085359
1. Reporting Requirements[Supersedes Section D. (2.)and Section E. (5.1 (a11
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eDMR)internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted monthly electronically using eDMR. The eDMR system allows permitted facilities to
enter monitoring data and submit DMRs electronically using the internet. The eDMR system may
be accessed at: https://deq.nc.gov/about/divisions/water-resources/edmr.
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the
facility being physically located in an area where less than 10 percent of the households have
broadband access,then a temporary waiver from the NPDES electronic reporting requirements
may be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1,1.1,
2,3) or alternative forms approved by the Director. Duplicate signed copies shall be submitted to
the following address:
NC DEQ/ Division of Water Resources/ Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
See"How to Request a Waiver from Electronic Reporting" section below.
Regardless of the submission method,the first DMR is due on the last day of the month following
the issuance of the permit or in the case of a new facility,on the last day of the month following the
commencement of discharge.
Starting on December 21,2025,the permittee must electronically report the following compliance
monitoring data and reports,when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports;and
• Clean Water Act(CWA)Section 316(b) Annual Reports.
The permittee may seek an electronic reporting waiver from the Division(see"How to Request a
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9),the permittee must identify the initial recipient at the time
of each electronic submission. The permittee should use the EPA's website resources to identify the
initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program) that is the designated
entity for receiving electronic NPDES data [see 40 CFR 127.2(b)].
Page 10 of 13

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
Permit NC0085359
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 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 122.221. NO OTHER STATEMENTS OF CERTIFICATION WILL
BE ACCEPTED:
Page 11 of 13

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
Permit NC0085359
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information; the information submitted is, to the best of
my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violations."
5. Records Retention [Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports,including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years from the
date of the report. This period may be extended by request of the Director at any time [40 CFR
122.41].
A.(8.) WATER EFFECT RATIO CONFIRMATION STUDY
[G.S. 143-215.1(b)]
a. During the period beginning on the effective date of the permit and prior to the expansion above
7.5 MGD or permit expiration,whichever comes first, the permittee shall conduct a confirmatory
Water Effect Ratio study to verify copper and zinc site-specific criteria.
b. The Permittee shall conduct a confirmatory Water Effect Ratio study to verify copper and zinc
site-specific criteria with each NPDES permit renewal.The WER study plan shall be submitted to
the Division for approval prior to the study being conducted.The study results shall be submitted
to the Division for approval.
c. The WER study plan and results reports shall include the owner's name, NPDES permit number
and permittee contact person,and shall be submitted to:
NCDEQ/ Division of Water Resources
NPDES Municipal Permitting
1617 Mail Service Center
Raleigh,NC 27699-1617
Page 12 of 13

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
Permit NC0085359
i
o
k Ii j is 'A t t.'
111 t
1
/1
4,\1/,.
n .• ',--:4, �
F �A * ',
J r,0
O'si„ ,.i-.
rMI.FR1SON t.
�. 4{ `
olrl%N 1
t A so_./
,-..„--,...------) ., / ,,,,.......= s,
Twelve Mile Creek �,v./A �—� ,�
•
WRF ` •I
v ) ` /'�• g, Q ,
±t /'� 51�:' \to `1f
Outfall 001 "
s
\•
.,.' 1 , ,
1 ) ' 0 oa '4)11 ,
\‘.1. .....)4‘..,•;7...:.›,,,,
. . 4/1/:/;2 \'''N'
, ,` �. `
I I, '
r ! ; ' i t ' 1. C� .
d' C. • ,;4j k `� s rt
4---"-li —. i".• r\ 130 ' ' ' \ - , 1
r � C 1 Pr cx.1, • -- *•\ ' ...\.
f-,,,,, , „. • . , 1301
5`7-----\,,..„..N 1,.1/4.,___ /4, ...,
I
Facility Information Facility
Latitude 34'57 01 Sun-Basin 03-08-38
Longitude: 80°45'44' B-DioitHUC 03050103 Location x
Quad# H15NE
Stream Class. C
Receivina Stream: Twelve Mile Creek NOT TO SCALE Twelve Mile Creek WRF
Permitted Flow: 7 5 MGD, 9.0 MGD and 12 0 MGD North NC0085359
Union County
Page 13 of 13

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page l of 18
PART II
STANDARD CONDITIONS FOR NPDES PERMITS
Section A. Definitions
2/Month
Samples are collected twice per month with at least ten calendar days between sampling events. These samples shall be
representative of the wastewater discharged during the sample period.
3/Week
Samples are collected three times per week on three separate calendar days. These samples shall be representative of
the wastewater discharged during the sample period.
Act or"the Act"
The Federal Water Pollution Control Act,also known as the Clean Water Act(CWA),as amended,33 USC 1251,et.
seq.
Annual Average
The arithmetic mean of all"daily discharges"of a pollutant measured during the calendar year. In the case of fecal
coliform,the geometric mean of such discharges.
Arithmetic Mean
The summation of the individual values divided by the number of individual values.
Bypass
The known diversion of waste streams from any portion of a treatment facility including the collection system,which is
not a designed or established or operating mode for the facility.
Calendar Day
The period from midnight of one day until midnight of the next day.However, for purposes of this permit,any
consecutive 24-hour period that reasonably represents the calendar day may be used for sampling.
Calendar Week
The period from Sunday through the following Saturday.
Calendar Quarter
One of the following distinct periods:January through March,April through June,July through September,and
October through December.
Composite Sample
A sample collected over a 24-hour period by continuous sampling or combining grab samples of at least 100 mL in
such a manner as to result in a total sample representative of the wastewater discharge during the sample period. The
Director may designate the most appropriate method(specific number and size of aliquots necessary,the time interval
between grab samples,etc.)on a case-by-case basis. Samples may be collected manually or automatically. Composite
samples may be obtained by the following methods:
(1) Continuous:a single,continuous sample collected over a 24-hour period proportional to the rate of flow.
(2) Constant time/variable volume: a series of grab samples collected at equal time intervals over a 24 hour period
of discharge and combined proportional to the rate of flow measured at the time of individual sample
collection,or
(3) Variable time/constant volume: a series of grab samples of equal volume collected over a 24 hour period with
the time intervals between samples determined by a preset number of gallons passing the sampling point.Flow
measurement between sample intervals shall be determined by use of a flow recorder and totalizer,and the
preset gallon interval between sample collection fixed at no greater than 1/24 of the expected total daily flow at
the treatment system,or
Version 11/09/2011.2

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 2 of 18
(4) Constant time/constant volume: a series of grab samples of equal volume collected over a 24-hour period at a
constant time interval.Use of this method requires prior approval by the Director.This method may only be
used in situations where effluent flow rates vary less than 15 percent. The following restrictions also apply:
➢ Influent and effluent grab samples shall be of equal size and of no less than 100 milliliters
➢ Influent samples shall not be collected more than once per hour.
➢ Permittees with wastewater treatment systems whose detention time<24 hours shall collect effluent grab
samples at intervals of no greater than 20 minutes apart during any 24-hour period.
➢ Permittees with wastewater treatment systems whose detention time exceeds 24 hours shall collect effluent
grab samples at least every six hours;there must be a minimum of four samples during a 24-hour sampling
period.
Continuous flow measurement
Flow monitoring that occurs without interruption throughout the operating hours of the facility. Flow shall be
monitored continually except for the infrequent times when there may be no flow or for infrequent maintenance
activities on the flow device.
Daily Discharge
The discharge of a pollutant measured during a calendar day or any 24-hour period that reasonably represents the
calendar day for purposes of sampling. For pollutants measured in units of mass,the"daily discharge"is calculated as
the total mass of the pollutant discharged over the day. For pollutants expressed in other units of measurement,the
"daily discharge"is calculated as the average measurement of the pollutant over the day. (40 CFR 122.2;see also
"Composite Sample,"above.)
Daily Maximum
The highest"daily discharge"during the calendar month.
Daily Sampling
Parameters requiring daily sampling shall be sampled 5 out of every 7 days per week unless otherwise specified in the
permit. Sampling shall be conducted on weekdays except where holidays or other disruptions of normal operations
prevent weekday sampling.If sampling is required for all seven days of the week for any permit parameter(s),that
requirement will be so noted on the Effluent Limitations and Monitoring Page(s).
DWR or"the Division"
The Division of Water Resources,Department of Environmental Quality.
Effluent
Wastewater discharged following all treatment processes from a water pollution control facility or other point source
whether treated or untreated.
EMC
The North Carolina Environmental Management Commission
EPA
The United States Environmental Protection Agency
Facility Closure
Cessation of all activities that require coverage under this NPDES permit. Completion of facility closure will allow this
permit to be rescinded.
Geometric Mean
The Nth root of the product of the individual values where N=the number of individual values.For purposes of
calculating the geometric mean,values of"0"(or"< [detection level]")shall be considered= 1.
Grab Sample
Individual samples of at least 100 mL collected over a period of time not exceeding 15 minutes. Grab samples can be
collected manually.Grab samples must be representative of the discharge(or the receiving stream, for instream
samples).
Version 11/09/2011.2

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 3 of 18
Hazardous Substance
Any substance designated under 40 CFR Part 116 pursuant to Section 311 of the CWA.
Instantaneous flow measurement
The flow measured during the minimum time required for the flow measuring device or method to produce a result in
that instance.To the extent practical,instantaneous flow measurements coincide with the collection of any grab
samples required for the same sampling period so that together the samples and flow are representative of the discharge
during that sampling period.
Monthly Average(concentration limit)
The arithmetic mean of all "daily discharges"of a pollutant measured during the calendar month. In the case of fecal
coliform or other bacterial parameters or indicators,the geometric mean of such discharges.
Permit Issuing Authority
The Director of the Division of Water Resources.
Quarterly Average(concentration limit)
The arithmetic mean of all samples taken over a calendar quarter.
Severe property damage
Substantial physical damage to property,damage to the treatment facilities which causes them to become inoperable,or
substantial and permanent loss of natural resources which can reasonably be expected to occur in the absence of a
bypass. Severe property damage excludes economic loss caused by delays in production.
Toxic Pollutant:
Any pollutant listed as toxic under Section 307(aX1)of the CWA.
Upset
An incident beyond the reasonable control of the Permittee causing unintentional and temporary noncompliance with
permit effluent limitations and/or monitoring requirements.An upset does not include noncompliance caused by
operational error, improperly designed treatment facilities,inadequate treatment facilities,lack of preventive
maintenance,or careless or improper operation.
Weekly Average(concentration limit)
The arithmetic mean of all "daily discharges"of a pollutant measured during the calendar week. In the case of fecal
coliform or other bacterial parameters or indicators,the geometric mean of such discharges.
Section B. General Conditions
1. Duty to Comply
The Permittee must comply with all conditions of this permit. Any permit noncompliance constitutes a violation of
the CWA and is grounds for enforcement action; for permit termination,revocation and reissuance,or
modification;or denial of a permit renewal application [40 CFR 122.41].
a. The Permittee shall comply with effluent standards or prohibitions established under section 307(a)of the
CWA for toxic pollutants and with standards for sewage sludge use or disposal established under section
405(d)of the CWA within the time provided in the regulations that establish these standards or prohibitions or
standards for sewage sludge use or disposal,even if the permit has not yet been modified to incorporate the
requirement.
b. The CWA provides that any person who violates section[s] 301,302,306,307,308,318 or 405 of the Act,or
any permit condition or limitation implementing any such sections in a permit issued under section 402,or any
requirement imposed in a pretreatment program approved under sections 402(aX3)or 402(bX8)of the Act,is
subject to a civil penalty not to exceed$37,500 per day for each violation. [33 USC 1319(d)and 40 CFR
122.41(a)(2)]
c. The CWA provides that any person who negligently violates sections 301,302,306,307,308,318,or 405 of
the Act,or any condition or limitation implementing any of such sections in a permit issued under section 402
of the Act,or any requirement imposed in a pretreatment program approved under section 402(a)(3)or
402(bX8)of the Act,is subject to criminal penalties of$2,500 to$25,000 per day of violation,or
Version 11/09/2011.2

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 4 of 18
imprisonment of not more than 1 year,or both. In the case of a second or subsequent conviction for a negligent
violation,a person shall be subject to criminal penalties of not more than$50,000 per day of violation,or by
imprisonment of not more than 2 years,or both. [33 USC 1319(c)(1)and 40 CFR 122.41(a)(2)] •
d. Any person who knowingly violates such sections,or such conditions or limitations is subject to criminal
penalties of$5,000 to$50,000 per day of violation,or imprisonment for not more than 3 years,or both.In the
case of a second or subsequent conviction for a knowing violation,a person shall be subject to criminal •
penalties of not more than$100,000 per day of violation,or imprisonment of not more than 6 years,or both.
[33 USC 1319(cX2)and 40 CFR 122.41(a)(2)]
e. Any person who knowingly violates section 301,302,303,306,307,308,318 or 405 of the Act,or any permit
condition or limitation implementing any of such sections in a permit issued under section 402 of the Act,and
who knows at that time that he thereby places another person in imminent danger of death or serious bodily
injury,shall,upon conviction,be subject to a fine of not more than$250,000 or imprisonment of not more than
15years,or both. In the case of a second or subsequent conviction for a knowingendangerment a
qviolation,
person shall be subject to a fine of not more than$500,000 or by imprisonment of not more than 30 years,or
both.An organization,as defined in section 309(c)(3)(BXiii)of the CWA,shall,upon conviction of violating
the imminent danger provision,be subject to a fine of not more than$1,000,000 and can be fined up to
$2,000,000 for second or subsequent convictions. [40 CFR 122.41(ax2)]
f. Under state law,a civil penalty of not more than$25,000 per violation may be assessed against any person
who violates or fails to act in accordance with the terms,conditions;or requirements of a permit. [North
Carolina General Statutes§ 143-215.6A]
g. Any person may be assessed an administrative penalty by the Administrator for violating section 301,302,
306,307,308,318 or 405 of this Act,or any permit condition or limitation implementing any of such sections
in a permit issued under section 402 of this Act.Administrative penalties for Class I violations are not to
exceed $16,000 per violation,with the maximum amount of any Class I penalty assessed not to exceed
$37,500.Penalties for Class II violations are not to exceed$16,000 per day for each day during which the
violation continues,with the maximum amount of any Class II penalty not to exceed$177,500. [33 USC
1319(gX2)and 40 CFR 122.41(a)(3)]
2. Duty to Mitigate
The Permittee shall take all reasonable steps to minimize or prevent any discharge or sludge use or disposal in
violation of this permit with a reasonable likelihood of adversely affecting human health or the environment[40
CFR 122.41(d)].
3. Civil and Criminal Liability
Except as provided in permit conditions on "Bypassing"(Part II.C.4),"Upsets"(Part II.C.5)and"Power Failures"
(Part II.C.7),nothing in this permit shall be construed to relieve the Permittee from any responsibilities,liabilities,
or penalties for noncompliance pursuant to NCGS 143-215.3, 143-215.6 or Section 309 of the Federal Act,33 USC
1319.Furthermore,the Permittee is responsible for consequential damages,such as fish kills,even though the
responsibility for effective compliance may be temporarily suspended.
4. Oil and Hazardous Substance Liability
Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the Permittee
from any responsibilities, liabilities,or penalties to which the Permittee is or may be subject to under NCGS 143-
215.75 et seq.or Section 311 of the Federal Act,33 USG 1321.Furthermore,the Permittee is responsible for
consequential damages,such as fish kills,even though the responsibility for effective compliance may be
temporarily suspended.
•
5. Property Rights
The issuance of this permit does not convey any property rights in either real or personal property,or any exclusive
privileges,nor does it authorize any injury to private property or any invasion of personal rights,nor any
infringement of Federal,State or local laws or regulations[40 CFR 122.41(g)].
6. Onshore or Offshore Construction
This permit does not authorize or approve the construction of any onshore or offshore physical structures or
facilities or the undertaking of any work in any navigable waters.
Version 11/09/2011.2

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 5 of 18
7. Severability
The provisions of this permit are severable. If any provision of this permit,or the application of any provision of
this permit to any circumstances,is held invalid,the application of such provision to other circumstances,and the
remainder of this permit,shall not be affected thereby [NCGS 150B-23].
8. Duty to Provide Information
The Permittee shall furnish to the Permit Issuing Authority,within a reasonable time, any information which the
Permit Issuing Authority may request to determine whether cause exists for modifying,revoking and reissuing,or
terminating this permit or to determine compliance with this permit. The Permittee shall also furnish to the Permit
Issuing Authority upon request,copies of records required by this permit [40 CFR 122.41(h)].
9. Duty to Reapply
If the Permittee wishes to continue an activity regulated by this permit after the expiration date of this permit,the
Permittee must apply for and obtain a new permit[40 CFR 122.41(b)].
10. Expiration of Permit
The Permittee is not authorized to discharge after the expiration date. In order to receive automatic authorization to
discharge beyond the expiration date,the Permittee shall submit such information,forms,and fees as are required
by the agency authorized to issue permits no later than 180 days prior to the expiration date unless permission for a
later date has been granted by the Director. (The Director shall not grant permission for applications to be
submitted later than the expiration date of the existing permit.) [40 CFR 122.21(d)]Any Permittee that has not
requested renewal at least 180 days prior to expiration,or any Permittee that does not have a permit after the
expiration and has not requested renewal at least 180 days prior to expiration,will subject the Permittee to
enforcement procedures as provided in NCGS 143-215.6 and 33 USC 1251 et. seq.
11. Signatory Requirements
All applications,reports,or information submitted to the Permit Issuing Authority shall be signed and certified [40
CFR 122.41(k)].
a. All permit applications shall be signed as follows:
(1) For a corporation: by a responsible corporate officer. For the purpose of this Section,a responsible
corporate officer means: (a)a president,secretary,treasurer or vice president of the corporation in charge
of a principal business function,or any other person who performs similar policy or decision making
functions for the corporation,or(b)the manager of one or more manufacturing,production,or operating
facilities,provided,the manager is authorized to make management decisions which govern the operation
of the regulated facility including having the explicit or implicit duty of making major capital investment
recommendations,and initiating and directing other comprehensive measures to assure long term
environmental compliance with environmental laws and regulations;the manager can ensure that the
necessary systems are established or actions taken to gather complete and accurate information for permit
application requirements;and where authority to sign documents has been assigned or delegated to the
manager in accordance with corporate procedures.
(2) For a partnership or sole proprietorship: by a general partner or the proprietor,respectively;or
(3) For a municipality,State,Federal,or other public agency: by either a principal executive officer or
ranking elected official [40 CFR 122.22].
b. All reports required by the permit and other information requested by the Permit Issuing Authority shall be
signed by a person described in paragraph a. above or by a duly authorized representative of that person. A
person is a duly authorized representative only if:
(1). The authorization is made in writing by a person described above;
(2) The authorization specified either an individual or a position having responsibility for the overall operation
of the regulated facility or activity,such as the position of plant manager,operator of a well or well field,
superintendent,a position of equivalent responsibility,or an individual or position having overall
responsibility for environmental matters for the company. (A duly authorized representative may thus be
either a named individual or any individual occupying a named position.);and
(3) The written authorization is submitted to the Permit Issuing Authority[40 CFR 122.22]
Version 11/09/2011.2

DocuSign Envelope ID 9CF9B540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 6 of 18
c. Changes to authorization: If an authorization under paragraph(b)of this section is no longer accurate because
a different individual or position has responsibility for the overall operation of the facility,a new authorization
satisfying the requirements of paragraph(b)of this section must be submitted to the Director prior to or
together with any reports, information,or applications to be signed by an authorized representative [40 CFR
122.22]
d. Certification.Any person signing a document under paragraphs a.or b.of this section shall make the following
certification [40 CFR 122.22].NO OTHER STATEMENTS OF CERTIFICATION WILL BE ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the.system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violations."
12. Permit Actions
This permit may be modified,revoked and reissued,or terminated for cause.The filing of a request by the
Permittee for a permit modification,revocation and reissuance,or termination,or a notification of planned changes
or anticipated noncompliance does not stay any permit condition [40 CFR 122.41(f)].
13. Permit Modification,Revocation and Reissuance,or Termination
The issuance of this permit does not prohibit the permit issuing authority from reopening and modifying the permit,
revoking and reissuing the permit,or terminating the permit as allowed by the laws,rules,and regulations
contained in Title 40,Code of Federal Regulations,Parts 122 and 123;Title 15A of the North Carolina
Administrative Code, Subchapter 02H.0100;and North Carolina General Statute 143.215.1 et. al.
14. Annual Administering and Compliance Monitoring Fee Requirements
The Permittee must pay the annual administering and compliance monitoring fee within thirty days after being
billed by the Division. Failure to pay the fee in a timely manner in accordance with 15A NCAC 02H.0105(b)(2)
may cause this Division to initiate action to revoke the permit.
Section C. Operation and Maintenance of Pollution Controls
1. Certified Operator
Owners of classified water pollution control systems must designate operators,certified by the Water Pollution
Control System Operators Certification Commission(WPCSOCC),of the appropriate type and grade for the
system,and, for each classification must[T15A NCAC 08G .0201]:
a. designate one Operator In Responsible Charge(ORC)who possesses a valid certificate of the type and grade at
least equivalent to the type and grade of,the system;
b. designate one or more Back-up Operator(s)in Responsible Charge(Back-up ORCs)who possesses a valid
certificate of the type of the system and no more than one grade less than the grade of the system,with the
exception of no backup operator in responsible charge is required for systems whose minimum visitation
requirements are twice per year;and
c. submit a signed completed "Water Pollution Control System Operator Designation Form"to the Commission
(or to the local health department for owners of subsurface systems)countersigned by the designated certified
operators,designating the Operator in Responsible Charge(ORC)and the Back-up Operator in Responsible
Charge(Back-up ORC):
(1) 60 calendar days prior to wastewater or residuals being introduced into a new system;or
(2) within 120 calendar days following:
➢ receiving notification of a change in the classification of the system requiring the designation of a new
Operator in Responsible Charge(ORC)and Back-up Operator in Responsible Charge(Back-up ORC)
of the proper type and grade;or
➢ a vacancy in the position of Operator in Responsible Charge(ORC)or Back-up Operator in
Responsible Charge(Back-up ORC).
Version 11/09/2011.2

DocuSign Envelope ID 9CF9B540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 7 of 18
(3) within seven calendar days of vacancies in both ORC and Back-up ORC positions replacing or designating
at least one of the responsibilities.
The ORC of each Class I facility(or the Back-up ORC,when acting as surrogate for the ORC)must:
> Visit the facility as often as is necessary to insure proper operation of the treatment system;the treatment
facility must be visited at least weekly
➢ Comply with all other conditions of 15A NCAC 08G .0204.
The ORC of each Class II,III and IV facility(or the Back-up ORC,when acting as surrogate for the ORC)must:
> Visit the facility as often as is necessary to insure proper operation of the treatment system;the treatment
facility must be visited at least five days per week,excluding holidays
➢ Properly manage and document daily operation and maintenance of the facility
> Comply with all other conditions of 15A NCAC 08G .0204.
2. Proper Operation and Maintenance
The Permittee shall at all times properly operate and maintain all facilities and systems of treatment and control
(and related appurtenances)which are installed or used by the Permittee to achieve compliance with the conditions
of this permit. Proper operation and maintenance also includes adequate laboratory controls and appropriate quality
assurance procedures.This provision requires the Permittee to install and operate backup or auxiliary facilities only
when necessary to achieve compliance with the conditions of the permit[40 CFR 122.41(e)].
NOTE: Properly and officially designated operators are fully responsible for all proper operation and maintenance
of the facility,and all documentation required thereof,whether acting as a contract operator[subcontractor]or a
member of the Permittee's staff.
3. Need to Halt or Reduce not a Defense
It shall not be a defense for a Permittee in an enforcement action that it would have been necessary to halt or
reduce the permitted activity in order to maintain compliance with the condition of this permit [40 CFR 122.41(c)].
4. Bypassing of Treatment Facilities
a. Bypass not exceeding limitations [40 CFR 122.41(m)(2)]
The Permittee may allow any bypass to occur which does not cause effluent limitations to be exceeded,but
only if it also is for essential maintenance to assure efficient operation. These bypasses are not subject to the
provisions of Paragraphs b.and c. of this section.
b. Notice [40 CFR 122.41(m)(3)]
(1) Anticipated bypass. If the Permittee knows in advance of the need for a bypass,it shall submit prior notice,
if possible at least ten days before the date of the bypass; including an evaluation of the anticipated quality
and effect of the bypass.
(2) Unanticipated bypass.The Permittee shall submit notice of an unanticipated bypass as required in Part
II.E.6. (24-hour notice).
c. Prohibition of Bypass
(1) Bypass from the treatment facility is prohibited and the Permit Issuing Authority may take enforcement
action against a Permittee for bypass,unless:
(A) Bypass was unavoidable to prevent loss of life,personal injury or severe property damage;
(B) There were no feasible alternatives to the bypass,such as the use of auxiliary treatment facilities,
retention of untreated wastes or maintenance during normal periods of equipment downtime.This
condition is not satisfied if adequate backup equipment should have been installed in the exercise of
reasonable engineering judgment to prevent a bypass which occurred during normal periods of
equipment downtime or preventive maintenance; and
(C) The Permittee submitted notices as required under Paragraph b.of this section.
(2) Bypass from the collection system is prohibited and the Permit Issuing Authority may take enforcement
action against a Permittee for a bypass as provided in any current or future system-wide collection system
permit associated with the treatment facility.
Version 11/09/2011.2

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 8 of 18
(3) The Permit Issuing Authority may approve an anticipated bypass,after considering its adverse effects,if
the Permit Issuing Authority determines that it will meet the three conditions listed above in Paragraph c.
(1)of this section.
5. Upsets
a. Effect of an upset [40 CFR 122.41(n)(2)]: An upset constitutes an affirmative defense to an action brought for
noncompliance with such technology based permit effluent limitations if the requirements of paragraph b.of
this condition are met.No determination made during administrative review of claims that noncompliance was
caused by upset,and before an action for noncompliance,is final administrative action subject to judicial
review.
b. Conditions necessary for a demonstration of upset:Any Permittee who wishes to establish the affirmative
defense of upset shall demonstrate,through properly signed,contemporaneous operating logs,or other relevant
evidence that:
(1)An upset occurred and that the Permittee can identify the cause(s)of the upset;
(2)The Permittee facility was at the time being properly operated;and
(3)The Permittee submitted notice of the upset as required in Part II.E.6.(b)of this permit.
(4)The Permittee complied with any remedial measures required under Part II.B.2.of this permit.
c. Burden of proof[40 CFR 122.41(n)(4)]: The Permittee seeking to establish the occurrence of an upset has
the burden of proof in any enforcement proceeding.
6. Removed Substances
Solids,sludges,filter backwash,or other pollutants removed in the course of treatment or control of wastewaters
shall be utilized/disposed of in accordance with NCGS 143-215.1 and in a manner such as to prevent any pollutant
from such materials from entering waters of the State or navigable waters of the United States except as permitted
by the Commission.The Permittee shall comply with all applicable state and Federal regulations governing the
including40 CFR 503,Standards for the Use and Disposal of Sewage Sludge;40 CFR
disposal of sewage sludge, p g g ,
Part 258,Criteria For Municipal Solid Waste Landfills;and 15A NCAC Subchapter 2T,Waste Not Discharged To
r change in1
Surface Waters. The Permittee shall notifythe Permit IssuingAuthorityof anysignificant cant c a eits sludge a use
g gg
or disposal practices.
7. Power Failures
The Permittee is responsible for maintaining adequate safeguards(as required by 15A NCAC 02H.0124)to
prevent the discharge of untreated or inadequately treated wastes during electrical power failures either by means
of alternate power sources,standby generators or retention of inadequately treated effluent.
Section D. Monitoring and Records
1. Representative Sampling
Samples collected and measurements taken,as required herein,shall be representative of the permitted discharge.
Samples collected at a frequency less than daily shall be taken on a day and time that is representative of the
h forperiod the sample represents.All samples shall be taken at the monitoringpoints specified in this
discharge o the p p p p
permit and,unless otherwise specified,before the effluent joins or is diluted by any other wastestream,body of
water,or substance.Monitoring points shall not be changed without notification to and the approval of the Permit
Issuing Authority [40 CFR 122.41(j)].
2. Reporting
Monitoring results obtained during the previous month(s)shall be summarized for each month and reported on a
monthly Discharge Monitoring Report(DMR)Form(MR 1, 1.1,2,3)or alternative forms approved by the
Director,postmarked no later than the last calendar day of the month following the completed reporting period.
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. Duplicate signed copies of these,
and all other reports required herein,shall be submitted to the following address:
Version 11/09/2011.2

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 9 of 18
NC DEQ/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
3. Flow Measurements
Appropriate flow measurement devices and methods consistent with accepted scientific practices shall be selected
and used to ensure the accuracy and reliability of measurements of the volume of monitored discharges.The
devices shall be installed,calibrated and maintained to ensure that the accuracy of the measurements is consistent
with the accepted capability of that type of device. Devices selected shall be capable of measuring flows with a
maximum deviation of less than 10%from the true discharge rates throughout the range of expected discharge
volumes. Flow measurement devices shall be accurately calibrated at a minimum of once per year and maintained
to ensure that the accuracy of the measurements is consistent with the accepted capability of that type of device.
The Director shall approve the flow measurement device and monitoring location prior to installation.
Once-through condenser cooling water flow monitored by pump logs,or pump hour meters as specified in Part I of
this permit and based on the manufacturer's pump curves shall not be subject to this requirement.
4. Test Procedures
Laboratories used for sample analysis must be certified by the Division. Permittees should contact the Division's
Laboratory Certification Section(919 733-3908)or visit https://deq.nc.gov/aboutldivisions/water-resources/water-
resources-data/water-sciences-home-page/laboratory-certification-branch for information regarding laboratory
certifications.
Facilities whose personnel are conducting testing of field-certified parameters only must hold the appropriate field
parameter laboratory certifications.
Test procedures for the analysis of pollutants shall conform to the EMC regulations(published pursuant to NCGS
143-215.63 et. seq.),the Water and Air Quality Reporting Acts,and to regulations published pursuant to Section
304(g),33 USC 1314,of the CWA(as amended),and 40 CFR 136;or in the case of sludge use or disposal,
approved under 40 CFR 136,unless otherwise specified in 40 CFR 503,unless other test procedures have been
specified in this permit[40 CFR 122.41].
To meet the intent of the monitoring required by this permit,all test procedures must produce minimum detection
and reporting levels that are below the permit discharge requirements and all data generated must be reported down
to the minimum detection or lower reporting level of the procedure. If no approved methods are determined
capable of achieving minimum detection and reporting levels below permit discharge requirements,then the most
sensitive(method with the lowest possible detection and reporting level)approved method must be used.
5. Penalties for Tampering
The CWA provides that any person who falsifies,tampers with,or knowingly renders inaccurate,any monitoring
device or method required to be maintained under this permit shall,upon conviction,be punished by a fine of not
more than $10,000 per violation,or by imprisonment for not more than two years per violation,or by both.If a
conviction of a person is for a violation committed after a first conviction of such person under this paragraph,
punishment is a fine of not more than $20,000 per day of violation,or by imprisonment of not more than 4 years,
or both [40 CFR 122.41].
6. Records Retention
Except for records of monitoring information required by this permit related to the Permittee's sewage sludge use
and disposal activities,which shall be retained for a period of at least five years(or longer as required by 40 CFR
503),the Permittee shall retain records of all monitoring information,including:
> all calibration and maintenance records
> all original strip chart recordings for continuous monitoring instrumentation
➢ copies of all reports required by this permit
> copies of all data used to complete the application for this permit
•
Version 11/09/2011.2

DocuSign Envelope ID.9CF9B540-72EA-41 FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 10 of 18
These records or copies shall be maintained for a period of at least 3 years from the date of the sample,
measurement,report or application.This period may be extended by request of the Director at any time [40 CFR
122.41].
7. Recording Results
For each measurement or sample taken pursuant to the requirements of this permit,the Permittee shall record the
following information [40 CFR 122.41]:
a. The date,exact place,and time of sampling or measurements;
b. The individual(s)who performed the sampling or measurements;
c. The date(s)analyses were performed;
d. The individual(s)who performed the analyses;
e. The analytical techniques or methods used;and
f. The results of such analyses.
8. Inspection and Entry
The Permittee shall allow the Director,or an authorized representative(including an authorized contractor acting as
a representative of the Director),upon the presentation of credentials and other documents as may be required by
law,to;
a. Enter,at reasonable times,upon the Permittee's premises where a regulated facility or activity is located or
conducted,or where records must be kept under the conditions of this permit;
b. Have access to and copy,at reasonable times,any records that must be kept under the conditions of this permit;
c. Inspect at reasonable times any facilities,equipment(including monitoring and control equipment),practices,
or operations regulated or required under this permit; and
d. Sample or monitor at reasonable times,for the purposes of assuring permit compliance or as otherwise
authorized by the CWA,any substances or parameters at any location [40 CFR 122.41(i)].
Section E Reporting Requirements
1. Change in Discharge
All discharges authorized herein shall be consistent with the terms and conditions of this permit. The discharge of
any pollutant identified in this permit more frequently than or at a level in excess of that authorized shall constitute
a violation of the permit.
2. Planned Changes
The Permittee shall give notice to the Director as soon as possible of any planned physical alterations or additions
to the permitted facility[40 CFR 122.41(1)].Notice is required only when:
a. The alteration or addition to a permitted facility may meet one of the criteria for new sources at 40 CFR
122.29(b);or
b. The alteration or addition could significantly change the nature or increase the quantity of pollutants
discharged. This notification applies to pollutants subject neither to effluent limitations in the permit,nor to
notification requirements under 40 CFR 122.42(a)(1);or
c. The alteration or addition results in a significant change in the Pennittee's sludge use or disposal practices,and
such alteration,addition or change may justify the application of permit conditions that are different from or
absent in the existing permit,including notification of additional use or disposal sites not reported during the
permit application process or not reported pursuant to an approved land application plan.
3. Anticipated Noncompliance
The Permittee shall give advance notice to the Director of any planned changes to the permitted facility or other
activities that might result in noncompliance with the permit[40 CFR 122.41(1X2)].
4. Transfers
This permit is not transferable to any person without prior written notice to and approval from the Director in
accordance with 40 CFR 122.61.The Director may condition approval in accordance with NCGS 143-215.1,in
Version 11/09/2011.2

DocuSign Envelope ID:9CF9B540-72EA-41 FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 11 of 18
particular NCGS 143-215.1(b)(4)b.2.,and may require modification or revocation and reissuance of the permit,or
a minor modification,to identify the new permittee and incorporate such other requirements as may be necessary
under the CWA [40 CFR 122.41(1)(3), 122.61] or state statute.
5. Monitoring Reports
Monitoring results shall be reported at the intervals specified elsewhere in this permit [40 CFR 122.41(1)(4)].
a. Monitoring results must be reported on a Discharge Monitoring Report(DMR)(See Part II.D.2)or forms
provided by the Director for reporting results of monitoring of sludge use or disposal practices.
b. If the Permittee monitors any pollutant more frequently than required by this permit using test procedures
approved under 40 CFR Part 136 and at a sampling location specified in this permit or other appropriate
instrument governing the discharge,the results of such monitoring shall be included in the calculation and
reporting of the data submitted on the DMR.
6. Twenty-four Hour Reporting
a. The Permittee shall report to the Director or the appropriate Regional Office any noncompliance that
potentially threatens public health or the environment.Any information shall be provided orally within 24
hours from the time the Permittee became aware of the circumstances.A written submission shall also be
provided within 5 days of the time the Permittee becomes aware of the circumstances. The written submission
shall contain a description of the noncompliance,and its cause;the period of noncompliance, including exact
dates and times,and if the noncompliance has not been corrected,the anticipated time it is expected to
continue;and steps taken or planned to reduce,eliminate,and prevent reoccurrence of the noncompliance [40
CFR 122.41(1)(6)].
b. The Director may waive the written report on a case-by-case basis for reports under this section if the oral
report has been received within 24 hours.
c. Occurrences outside normal business hours may also be reported to the Division's Emergency Response
personnel at(800)858-0368 or(919)733-3300.
7. Other Noncompliance
The Permittee shall report all instances of noncompliance not reported under Part II.E.5 and 6.of this permit at the
time monitoring reports are submitted. The reports shall contain the information listed in Part II.E.6.of this permit
[40 CFR 122.41(1X7)].
8. Other Information
Where the Permittee becomes aware that it failed to submit any relevant facts in a permit application,or submitted
incorrect information in a permit application or in any report to the Director,it shall promptly submit such facts or
information [40 CFR 122.41(lx8)].
9. Noncompliance Notification
The Permittee shall report by telephone to either the central office or the appropriate regional office of the Division
as soon as possible,but in no case more than 24 hours or on the next working day following the occurrence or first
knowledge of the occurrence of any of the following:
a. Any occurrence at the water pollution control facility which results in the discharge of significant amounts of
wastes which are abnormal in quantity or characteristic,such as the dumping of the contents of a sludge
digester;the known passage of a slug of hazardous substance through the facility;or any other unusual
circumstances.
b. Any process unit failure,due to known or unknown reasons,that render the facility incapable of adequate
wastewater treatment such as mechanical or electrical failures of pumps,aerators,compressors,etc.
c. Any failure of a pumping station,sewer line,or treatment facility resulting in a by-pass without treatment of all
or any portion of the influent to such station or facility.
Persons reporting such occurrences by telephone shall also file a written report within 5 days following first
knowledge of the occurrence.Also see reporting requirements for municipalities in Part IV.C.2.c.of this permit.
10. Availability of Reports
Except for data determined to be confidential under NCGS 143-215.3 (a)(2)or Section 308 of the Federal Act, 33
USC 1318,all reports prepared in accordance with the terms shall be available for public inspection at the offices
•
Version 11/09/2011.2

DocuSign Envelope ID.9CF9B540-72EA-41 FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 12 of 18
of the Division.As required by the Act,effluent data shall not be considered confidential. Knowingly making any
false statement on any such report may result in the imposition of criminal penalties as provided for in NCGS 143-
215.1(b)(2)or in Section 309 of the Federal Act.
11. Penalties for Falsification of Reports
The CWA provides that any person who knowingly makes any false statement,representation,or certification in
any record or other document submitted or required to be maintained under this permit,including monitoring
reports or reports of compliance or noncompliance shall,upon conviction,be punished by a fine of not more than
$25,000 per violation,or by imprisonment for not more than two years per violation,or by both [40 CFR 122.41].
12. Annual Performance Reports
Permittees who own or operate facilities that primarily collect or treat municipal or domestic wastewater and have
an average annual flow greater than 200,000 gallons per day shall provide an annual report to the Permit Issuing
Authority and to the users/customers served by the Permittee(NCGS 143-215.1C). The report shall summarize the
performance of the collection or treatment system,as well as the extent to which the facility was compliant with
applicable Federal or State laws,regulations and rules pertaining to water quality. The report shall be provided no
later than sixty days after the end of the calendar or fiscal year,depending upon which annual period is used for
evaluation.
The report shall be sent to:
NC DEQ/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
Version 11/09/2011.2

DocuSign Envelope ID:9CF9B540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 13 of 18
PART III
OTHER REQUIREMENTS
Section A. Construction
a. The Permittee shall not commence construction of wastewater treatment facilities,nor add to the plant's treatment
capacity,nor change the treatment process(es)utilized at the treatment plant unless(1)the Division has issued an
Authorization to Construct(AtC)permit or(2)the Permittee is exempted from such AtC permit requirements
under Item b.of this Section.
b. In accordance with NCGS 143-215.1(a5) [SL 2011-394],no permit shall be required to enter into a contract for the
construction, installation,or alteration of any treatment work or disposal system or to construct,install,or alter any
treatment works or disposal system within the State when the system's or work's principle function is to conduct,
treat,equalize,neutralize, stabilize,recycle,or dispose of industrial waste or sewage from an industrial facility and
the discharge of the industrial waste or sewage is authorized under a permit issued for the discharge of the
industrial waste or sewage into the waters of the State. Notwithstanding the above,the permit issued for the
discharge may be modified if required by federal regulation.
c. Issuance of an AtC will not occur until Final Plans and Specifications for the proposed construction have been
submitted by the Permittee and approved by the Division.
Section B. Groundwater Monitoring
The Permittee shall,upon written notice from the Director,conduct groundwater monitoring as may be required to
determine the compliance of this NPDES permitted facility with the current groundwater standards.
Section C. Changes in Discharges of Toxic Substances
The Permittee shall notify the Permit Issuing Authority as soon as it knows or has reason to believe(40 CFR 122.42):
a. That any activity has occurred or will occur which would result in the discharge,on a routine or frequent basis,of
any toxic pollutant which is not limited in the permit,if that discharge will exceed the highest of the following
"notification levels";
(1) One hundred micrograms per liter(100 µg/L);
(2) Two hundred micrograms per liter(200 µg/L)for acrolein and acrylonitrile;five hundred micrograms per liter
(500 µg/L)for 2,4-dinitrophenol and for 2-methyl-4,6-dinitrophenol; and one milligram per liter(1 mg/L)for
antimony;
(3) Five times the maximum concentration value reported for that pollutant in the permit application.
b. That any activity has occurred or will occur which would result in any discharge,on a non-routine or infrequent
basis,of a toxic pollutant which is not limited in the permit,if that discharge will exceed the highest of the
following "notification levels";
(1) Five hundred micrograms per liter(500 µg/L);
(2) One milligram per liter(1 mg/L)for antimony;
(3) Ten times the maximum concentration value reported for that pollutant in the permit application.
Section D. Facility Closure Requirements
The Permittee must notify the Division at least 90 days prior to the closure of any wastewater treatment system covered
by this permit.The Division may require specific measures during deactivation of the system to prevent adverse
impacts to waters of the State. This permit cannot be rescinded while any activities requiring this permit continue at the
permitted facility.
Version 11/09/2011.2

DocuSign Envelope ID 9CF9B540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 14 of 18
PART IV
SPECIAL CONDITIONS FOR MUNICIPAL FACILITIES
Section A. Definitions
In addition to the definitions in Part II of this permit,the following defmitions apply to municipal facilities:
Indirect Discharge or Industrial User
Any non-domestic source that discharges wastewater containing pollutants into a POTW regulated under section
307(b),(c)or(d)of the CWA. [40 CFR 403.3 (i)and(j)and 15A NCAC 02H.0903(bxl 1)]
Interference
Inhibition or disruption of the POTW treatment processes;operations;or its sludge process,use,or disposal which
causes or contributes to a violation of any requirement of the Permittee's(or any satellite POTW's if different from the
Permittee)NPDES,collection system,or non-discharge permit or prevents sewage sludge use or disposal in
compliance with specified applicable State and Federal statutes,regulations,or permits. [15A NCAC 02H
.0903(b)(14)]
Pass Through
A discharge which exits the POTW into waters of the State in quantities or concentrations which,alone or with
discharges from other sources,causes a violation,including an increase in the magnitude or duration of a violation,of
the Permittee's(or any satellite POTWs,if different from the Permittee)NPDES,collection system,or non-discharge
permit. [15A NCAC 02H.0903(b)(23)]
Publicly Owned Treatment Works(POTW)
A treatment works as defined by Section 212 of the CWA,which is owned by a State or local government organization.
This definition includes any devices and systems used in the storage,treatment,recycling and reclamation of municipal
sewage or industrial wastes of a liquid nature.It also includes the collection system,as defined in 15A NCAC 2T
.0402,only if it conveys wastewater to a POTW treatment plant. The term also means the local government
organization,or municipality,as defined in section 502(4)of the CWA,which has jurisdiction over indirect discharges
to and the discharges from such a treatment works. In this context,the organization may be the owner of the POTW
treatment plant or the owner of the collection system into which an indirect discharger discharges.This second type of
POTW may be referred to as a"satellite POTW organization." [15A NCAC 02H.0903(b)(26)]
"Significant Industrial User"or"SIU"
An Industrial User that discharges wastewater into a publicly owned treatment works and that[15A NCAC 02H
.0903(bx33)]:
1. Discharges an average of 25,000 gallons per day or more of process wastewater to the POTW(excluding sanitary,
noncontact cooling and boiler blowdown wastewaters);or
2. Contributes process wastewater which makes up five percent or more of the NPDES or non-discharge permitted
flow limit or organic capacity of the POTW treatment plant.In this context,organic capacity refers to BOD,TSS
and ammonia;or
3. Is subject to categorical standards under 40 CFR Part 403.6 and 40 CFR Parts 405-471;or
4. Is designated as such by the Permittee on the basis that the Industrial User has a reasonable potential for adversely
affecting the POTW's operation or for violating any pretreatment standard or requirement,or the POTW's effluent
limitations and conditions in its NPDES or non-discharge permit,or to limit the POTW's sludge disposal options;
5. Subject to approval under 15A NCAC 02H.0907(b),the Permittee may determine that an Industrial User meeting
the criteria in paragraphs 1 or 2 of this definition above has no reasonable potential for adversely affecting the
POTWs operation or for violating any pretreatment standard or requirement,the POTWs effluent limitations and
conditions in its NPDES or non-discharge permit,or to limit the POTW's sludge disposal options,and thus is not a
Significant Industrial User(SIU);or
6. Subject to approval under 15A NCAC 02H .0907(b),the Permittee may determine that an Industrial User meeting
the criteria in paragraph 3 of this definition above meets the requirements of 40 CFR Part 403.3(vX2)and thus is a
non-significant categorical Industrial User.
Section B. Publicly Owned Treatment Works(POTWs)
Version 11/09/2011.2

DocuSign Envelope ID 9CF9B540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 15 of 18
All POTWs must provide adequate notice to the Director of the following [40 CFR 122.42(b)]:
1. Any new introduction of pollutants into the POTW from an indirect discharger,regardless of the means of
transport,which would be subject to section 301 or 306 of CWA if it were directly discharging those pollutants;
and
2. Any substantial change in the volume or character of pollutants being introduced by an indirect discharger as
influent to that POTW at the time of issuance of the permit.
3. For purposes of this paragraph,adequate notice shall include information on(1)the quality and quantity of effluent
introduced into the POTW,and(2)any anticipated impact that may result from the change of the quantity or
quality of effluent to be discharged from the POTW.
Section C. Municipal Control of Pollutants from Industrial Users.
1. Effluent limitations are listed in Part I of this permit.Other pollutants attributable to inputs from Industrial Users
discharging to the POTW may be present in the Permittee's discharge.At such time as sufficient information
becomes available to establish limitations for such pollutants,this permit may be revised to specify effluent
limitations for any or all of such other pollutants in accordance with best practicable technology or water quality
standards.
2. Prohibited Discharges
a. The Permittee shall develop and enforce their Pretreatment Program to implement the prohibition against the
introduction of pollutants or discharges into the waste treatment system or waste collection system which
cause or contribute to Pass Through or Interference as defined in 15A NCAC 02H.0900 and 40 CFR 403. [40
CFR 403.5(a)(1)]
b. The Permittee shall develop and enforce their Pretreatment Program to implement the prohibitions against the
introduction of the following wastes in the waste treatment or waste collection system [40 CFR 403.5(b)]:
(1) Pollutants which create a fire or explosion hazard in the POTW,including,but not limited to,
wastestreams with a closed cup flashpoint of less than 140 degrees Fahrenheit or 60 degrees Centigrade
using the test methods specified in 40 CFR 261.21;
(2) Pollutants which cause corrosive structural damage to the POTW,but in no case discharges with pH lower
than 5.0,unless the works is specifically designed to accommodate such discharges;
(3) Solid or viscous pollutants in amounts which cause obstruction to the flow in the POTW resulting in
Interference;
(4) Any pollutant,including oxygen demanding pollutants(BOD,etc.)released in a Discharge at a flow rate
and/or pollutant concentration which will cause Interference with the POTW;
(5) Heat in amounts which will inhibit biological activity in the POTW resulting in Interference,but in no
case heat in such quantities that the temperature at the POTW Treatment Plant exceeds 40°C(104°F)
unless the Division,upon request of the POTW,approves alternate temperature limits;
(6) Petroleum oil,non-biodegradable cutting oil,or products of mineral oil origin in amounts that will cause
Interference or Pass Through;
(7) Pollutants which result in the presence of toxic gases,vapors,or fumes within the POTW in a quantity that
may cause acute worker health and safety problems;or
(8) Any trucked or hauled pollutants,except at discharge points designated by the POTW.
c. The Permittee shall investigate the source of all discharges into the POTW,including slug loads and other
unusual discharges,which have the potential to adversely impact the Permittee's Pretreatment Program and/or
the operation of the POTW.
The Permittee shall report such discharges into the POTW to the Director or the appropriate Regional Office.
Any information shall be provided orally within 24 hours from the time the Permittee became aware of the
circumstances.A written submission shall also be provided within 5 days of the time the Permittee becomes
aware of the circumstances. The written submission shall contain a description of the discharge;the
investigation into possible sources;the period of the discharge,including exact dates and times; if the
discharge has not ceased,the anticipated time it is expected to continue; and steps taken or planned to reduce,
eliminate,and prevent reoccurrence of the noncompliance,
Version 11/09/2011.2

DocuSign Envelope ID:9CF98540-72EA-41 F D-B6E8-889D08459F96
NPDES Permit Standard Conditions
Page 16 of 18
3. With regard to the effluent requirements listed in Part I of this permit,it may be necessary for the Permittee to
supplement the requirements of the Federal Pretreatment Standards(40 CFR,Part 403)to ensure compliance by
the Permittee with all applicable effluent limitations. Such actions by the Permittee may be necessary regarding
some or all of the industries discharging to the municipal system.
4. The Permittee shall require any Industrial User(IU)discharging to the POTW to meet Federal Pretreatment
Standards developed under Section 307(b)of the Act as amended(which includes categorical standards and
specific local limits,best management practices and narrative requirements). Prior to accepting wastewater from
any Significant Industrial User(SIU),the Permittee shall either develop and submit to the Division a new
Pretreatment Program or,as necessary,a modification of an existing Pretreatment Program,for approval as
required under section D below as well as 15A NCAC 02H.0907(a)and(b). [40 CFR 122.44(j)(2)]
5. This permit shall be modified,or alternatively,revoked and reissued,to incorporate or modify an approved POTW
Pretreatment Program or to include a compliance schedule for the development of a POTW Pretreatment Program
as required under Section 402(b)(8)of the CWA and implementing regulations or by the requirements of the
approved State pretreatment program,as appropriate.
Section D. Pretreatment Pro<urams
Under authority of sections 307(b)and(c)and 402(b)(8)of the CWA and implementing regulations 40 CFR 403,
North Carolina General Statute 143-215.3(14)and implementing regulations 15A NCAC 02H.0900,and in accordance
with the approved pretreatment program,all provisions and regulations contained and referenced in the pretreatment
program submittal are an enforceable part of this permit. [40 CFR 122.44(j)(2)]
The Permittee shall operate its approved pretreatment program in accordance with Section 402(b)(8)of the CWA,40
CFR 403, 15A NCAC 02H .0900,and the legal authorities,policies,procedures,and financial provisions contained in
its pretreatment program submission and Division approved modifications thereof. Such operation shall include but is
not limited to the implementation of the following conditions and requirements. Terms not defined in Part II or Part IV
of this permit are as defined in 15A NCAC 02H.0903 and 40 CFR 403.3.
1. Sewer Use Ordinance(SUO)
The Pennittee shall maintain adequate legal authority to implement its approved pretreatment program. [15A
NCAC 02H.0903(b)(32), .0905 and .0906(bxl);40 CFR 403.8(f)(1)and 403.9(bxi)and (2)]
2. Industrial Waste Survey(IWS)
The Permittee shall implement an IWS consisting of the survey of users of the POTW collection system or
treatment plant,as required by 40 CFR 403.8(f)(2)(i-iii)and 15A NCAC 02H.0905 [also 40 CFR 122.44(jx 1)],
including identification of all Industrial Users that may have an impact on the POTW and the character and amount
of pollutants contributed to the POTW by these Industrial Users and identification of those Industrial Users
meeting the defmition of SIU. Where the Permittee accepts wastewater from one or more satellite POTWs,the
IWS for the Pennittee shall address all satellite POTW services areas,unless the pretreatment program in those
satellite service areas is administered by a separate Permittee with an approved Pretreatment Program.The
Permittee shall submit a summary of its IWS activities to the Division at least once every five years,and as
required by the Division. The IWS submission shall include a summary of any investigations conducted under
paragraph C.2.c. of this Part. [15A NCAC 02H.0903(b)(13), .0905 and.0906(b)(2);40 CFR 403.8(f(2)and 403.9]
3. Monitoring Plan
The Permittee shall implement a Division-approved Monitoring Plan for the collection of facility specific data to
be used in a wastewater treatment plant Headworks Analysis(HWA)for the development of specific pretreatment
local limits.Effluent data from the Plan shall be reported on the DMRs(as required by Parts II.D and II.E.5.). [15A
NCAC 02H.0903(b)(16), .0906(b)(3)and .0905]
4. Headworks Analysis(HWA)and Local Limits
The Permittee shall obtain Division approval of a HWA at least once every five years,and as required by the
Division. Within 180 days of the effective date of this permit(or any subsequent permit modification)the
Permittee shall submit to the Division a written technical evaluation of the need to revise local limits(i.e.,an
updated HWA or documentation of why one is not needed) [40 CFR 122.44].The Permittee shall develop,in
accordance with 40 CFR 403.5(c)and 15A NCAC 02H.0909,specific Local Limits to implement the prohibitions
listed in 40 CFR 403.5(a)and(b)and 15A NCAC 02H.0909.Pursuant to 40 CFR 403.5,local limits are
Version 11/09/2011.2

DocuSign Envelope ID 9CF98540-72EA-41FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 17 of 18
enforceable Pretreatment Standards as defined by 40 CFR 403.3(1). [15A NCAC 02H.0903(b)(10),.0905,and
.0906(bx4)]
5. Industrial User Pretreatment Permits(IUP)&Allocation Tables
In accordance with NCGS 143-215.1,the Permittee shall issue to all Significant Industrial Users,permits for
operation of pretreatment equipment and discharge to the Permittee's collection system or treatment works. These
permits shall contain limitations, sampling protocols,reporting requirements,appropriate standard and special
conditions,and compliance schedules as necessary for the installation of treatment and control technologies to
assure that their wastewater discharge will meet all applicable pretreatment standards and requirements. The
Permittee shall maintain a current Allocation Table(AT)which summarizes the results of the HWA and the limits
from all IUPs.Permitted IUP loadings for each parameter cannot exceed the treatment capacity of the POTW as
determined by the HWA. [15A NCAC 02H.0906(bX6),.0909, .0916,and .0917;40 CFR 403.5,403.8(f)(lXiii);
NCGS 143-215.67(a)]
6. Authorization to Construct(AtC)
The Permittee shall ensure that an Authorization to Construct permit(AtC)is issued to all applicable Industrial
Users for the construction or modification of any pretreatment facility. Prior to the issuance of an AtC,the
proposed pretreatment facility and treatment process must be evaluated for its capacity to comply with all
Industrial User Pretreatment Permit(IUP)limitations. [15A NCAC 02H.0906(b)(7)and .0905;NCGS 143-
215.1(a)(8)]
7. POTW Inspection&Monitoring of their IUs
The Permittee shall conduct inspection,surveillance,and monitoring activities as described in its Division
approved pretreatment program in order to determine,independent of information supplied by Industrial Users,
compliance with applicable pretreatment standards. [15A NCAC 02H.0908(e);40 CFR 403.8(f)(2)(v)] The
Permittee must:
a. Inspect all Significant Industrial Users(SIUs)at least once per calendar year,
b. Sample all Significant Industrial Users(SIUs)at least once per calendar year for all SIU permit-limited
parameters including flow except as allowed under 15A NCAC .0908(e);and
c. At least once per year,document an evaluation of any non-significant categorical Industrial User for
compliance with the requirements in 40 CFR 403.3(v)(2),and either continue or revoke the designation as non-
significant.
8. IU Self Monitoring and Reporting
The Permittee shall require all Industrial Users to comply with the applicable monitoring and reporting
requirements outlined in the Division-approved pretreatment program,the industry's pretreatment permit,or in 15A
NCAC 02H.0908. [15A NCAC 02H.0906(b)(5)and .0905;40 CFR 403.8(f)(1)(v)and(2)(iii);40 CFR
122.44(jX2)and 40 CFR 403.12]
9. Enforcement Response Plan(ERP)
The Permittee shall enforce and obtain appropriate remedies for violations of all pretreatment standards
promulgated pursuant to section 307(b)and(c)of the CWA(40 CFR 405 et. seq.),prohibitive discharge standards
as set forth in 40 CFR 403.5 and 15A NCAC 02H .0909,specific local limitations,and other pretreatment
requirements.All remedies,enforcement actions and other,shall be consistent with the Enforcement Response
Plan(ERP)approved by the Division. [15A NCAC 02H.0903(b)(7),.0906(b)(8)and .0905;40 CFR 403.8(0(5)]
10. Pretreatment Annual Reports(PAR)
The Permittee shall report to the Division in accordance with 15A NCAC 02H.0908.In lieu of submitting annual
reports,Modified Pretreatment Programs developed under 15A NCAC 02H.0904(b)may be required to submit a
partial annual report or to meet with Division personnel periodically to discuss enforcement of pretreatment
requirements and other pretreatment implementation issues.
For all other active pretreatment programs,the Permittee shall submit two copies of a Pretreatment Annual Report
(PAR)describing its pretreatment activities over the previous calendar year to the Division at the following
address:
Version 11/09/2011.2

DocuSign Envelope ID 9CF9B540-72EA-41 FD-B6EB-B89D08459F96
NPDES Permit Standard Conditions
Page 18 of 18
NC DEQ/Division of Water Resources/Water Quality Permitting Section
Pretreatment,Emergency Response,and Collection Systems(PERCS)Unit
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
These reports shall be submitted by March 1 of each year and shall contain the following:
a. Narrative
A narrative summary detailing actions taken,or proposed,by the Permittee to correct significant non-
compliance and to ensure compliance with pretreatment requirements;
b. Pretreatment Program Summary(PP
S)
(P )
A pretreatment program summary(PPS)on forms or in a format provided by the Division;
c. Significant Non-Compliance Report(SNCR)
A list of Industrial Users(lUs)in significant noncompliance(SNC)with pretreatment requirements,and the
nature of the violations on forms or in a format provided by the Division;
d. Industrial Data Summary Forms(IDSF)
Monitoring data from samples collected by both the POTW and the Significant Industrial Users(SIUs). These
analytical results must be reported on Industrial Data Summary Forms(IDSF)or on other forms or in a format
provided by the Division;
e. Other Information
Copies of the POTW's allocation table,new or modified enforcement compliance schedules,public notice of
IUs in SNC, a summary of data or other information related to significant noncompliance determinations for
IUs that are not considered SIUs,and any other information,upon request,which in the opinion of the Director
is needed to determine compliance with the pretreatment implementation requirements of this permit;
11. Public Notice
The Permittee shall publish annually a list of Industrial Users(Ws)that were in significant noncompliance(SNC)
as defined in the Permittee's Division-approved Sewer Use Ordinance with applicable pretreatment requirements
and standards during the previous twelve month period.This list shall be published within four months of the
applicable twelve-month period. [15A NCAC 02H .0903(b)(34),.0908(bX5)and.0905 and 40 CFR
403.8(f)(2)(viii)]
12. Record Keeping
The Permittee shall retain for a minimum of three years records of monitoring activities and results,along with
support information including general records,water quality records,and records of industrial impact on the
POTW and shall retain all other Pretreatment Program records as required by 15A NCAC 02H.0908(f). [15A
NCAC 02H.0908(f);40 CFR 403.12(o)]
13. Pretreatment Program Resources
The Permittee shall maintain adequate funding and qualified personnel to accomplish the objectives of its approved
pretreatment program. and retain a written description of those current levels of inspection. [15A NCAC 02H
.0906(b)(9)and(10)and .0905;40 CFR 403.8(f)(3),403.9(bX3)]
14. Modification to Pretreatment Programs
Modifications to the approved pretreatment program including but not limited to local limits modifications,POTW
monitoring of their Significant Industrial Users(SIUs),and Monitoring Plan modifications,shall be considered a
permit modification and shall be governed by 40 CFR 403.18, 15 NCAC 02H.0114 and 15A NCAC 02H.0907.
Version 11/09/2011.2

ATTACHMENT 3E
ENGINEERING PLANS

ENGINEERING PLANS SUBMITTED SEPARATELY

ATTACHMENT 3F
ENGINEERING SPECIFICATIONS

ENGINEERING SPECIFICATIONS SUBMITTED SEPARATELY

ATTACHMENT 3G
CONSTRUCTION SEQUENCE PLAN

Hazen
Construction Sequence Plan
These work sequences are taken from the specification section 01 14 00 1.06.
Influent and Diversion Pumping Work Sequence
1. Influent Pump Station 1 (IPS 1) shall remain in service continuously for the entire duration of the
construction of IPS 2.
2. Complete installation of IPS 2,manhole(MH) F1,Flow Meter Vault,and the associated piping,
electrical,and instrumentation work,including all associated work in the Influent Electrical
Building.
3. Complete startup of IPS 2 with the new pumps and operate for a period of one(1)month to
demonstrate reliable functionality.
4. Shutdown the existing IPS I for rehabilitation and modification. Once work has been completed,
the facility shall be operated for a period of one(1)month to demonstrate reliable functionality.
5. The Diversion Pump Station (DPS)shall remain in service throughout construction until the
associated electrical breaker must be disconnected to complete the work in the Influent Electrical
building.
MLDS and Secondary Clarifier Work Sequence
1. Secondary Clarifiers 1,2, 5, and 6 and RAS Pump Stations A and C shall remain in service
continuously for the entire duration of the construction of new Secondary Clarifier 4 and RAS
Pump Station B.
2. Complete all work associated with the MLSS Distribution Box.
a. During construction of Secondary Clarifier 4, install temporary piping that provides a
hydraulic connection between the Aeration Tanks 1 and 2 effluent channel and Secondary
Clarifiers 1 and 2. Provide an additional run of temporary piping that provides a
hydraulic connection between the Aeration Tanks 5 and 6 effluent channel and Secondary
Clarifiers 5 and 6. This work will require temporary partial shutdowns of the Aeration
Tanks. During a subsequent shutdown,plugs shall be installed in the permanent ATE
lines and the temporary piping shall be connected so that flow is completely bypassed
around the MLSS Distribution Box.
b. This work shall be performed over a period of three(3)months between the months of
April and September when plant flows are typically lower during the year.
3. Complete installation of Secondary Clarifier 4 and RAS Pump Station B and the associated
piping, electrical, and instrumentation work,including all associated work in the Electrical
Building 4.
4. Complete startup of Secondary Clarifier 4 and RAS Pump Station B with the new pumps and
operate for a period of one(1)month to demonstrate reliable functionality.
5. Complete all work associated with the existing Secondary Clarifiers and RAS Pump Stations,
starting with Secondary Clarifiers 5 and 6 sequentially,and then the Work at Secondary Clarifiers
1 and 2 may be performed simultaneously.
Hazen and Sawyer•9101 Southern Pine Blvd, Suite 250 • Charlotte, NC 28273•704.357.3150

ATTACHMENT 3H
ENGINEERING CALCULATIONS

THIS PAGE INTENTIONALLY LEFT BLANK

UNION COUNTY WATER
TWELVE MILE CREEK
WASTEWATER RECLAMATION FACILITY
9.0 MGD PLANT EXPANSION
DESIGN CALCULATIONS
H CAR
k
�'�y
of Ess� 2
0
264�2
t e;citl '4V/Q7.20kog R
''eL D P ccZ
Hazen
DECEMBER 2022

TWELVE MILE CREEK WRF 9.0 MGD PLANT EXPANSION
DESIGN CALCULATIONS
INDEX
01 - HYDRAULIC PROFILE
02 - PROCESS SCHEMATIC
03 - INFLUENT AND DIVERSION PUMPS
04 - AERATION BLOWER
05 - SECONDARY CLARIFIER 4
06 - RAS PUMPS
07 - CHEMICAL FACILITY
08 - WAS BLENDING PUMP
09 - DESIGN INFLUENT CONCENTRATIONS AND PROCESS DESIGN
CHARACTERISTICS
10 - BUOYANCY CALCULATIONS

01 - HYDRAULIC PROFILE
Union County FORM ATC-12-14
Twelve Mile Creek WRF Expansion Attachment for Section 3.H
NPDES No.NC0085359

•
•
_59O Ip LAmwiwwTEI 590
W MEL�.M-
SEE. �sa.MM
_
!L !fT
I 7xenusMo wauss M
=590 NH
SBOMAn4m _ wAM _ z_ 16 632 ssxo i1ro) Y Nu -
•— _ _ _I '°
—560
xaa NINE ..,a,e. d i:Lseom wM+n sn.=e... 560—
EFFLUENT
e, _ -
GRITWON.EFF EFFLUENT R.OW
REMOVAL — _I Roc', p Q I
_550 �'_ FACILITY I .i J _, - J. Lz_ ECSM .- __ _.. nMnm..,40.11646. 65Ym .. 550
-_FyY•'^ L � AERATION MT. - _ & _
ran�L gSTRBIft1ON AERATION .4. ' —
EL4 0 _
=540 .. .. .. .. TANKS f.". NvlL MEM .. ,1 . 3 F15MM.. 5e0=
` DUX INFLUENT FINS ` ItIN UTION IN
// / 1—= �pI _
_530 // .n.. CLOTH DISC J _ I�.�lL`-$„ 530_
FLIERS
'ULTRAVCTET
l FLTERS DISINFECTION
F o.an _ ` �, SHE
1--/ ♦ TIDH AERATOR
R. RO MalMIM AERATOR
=.] .Mx .Mm .e5,m .uN CUM , SECONDARY .. .
,. iµ�i ,AR" . rn STATION.MIN M SUNoEw
•
_510 FL a, = EL.SM. 5f0
aM.., E.,,., ( I _
= M,m — II WAS FLOW MAN FLOW ISEE NOTES,FLow NOTES:
PROCESS oLWUSING ELEVATIONS =.1�oa, L u..\'"I
,osacs �"1LaW.En sL�f, a...KcFLOAT MR 0053 LANDAU
2.WAFER
CLAW..,,MFr
=EA .. - rn RATED �MR�°.ry aao°�`P .L°owss ...w.r 1....', .. sao=
EAST FORK �l
WMADLIC
SEWER •lw low
— - $ �- _� _ - Oc�Lan n1
•
tLEv.ilaxp cEi.1 _
l ',ow .orrt i�lw cww.EiNeFRMCE.
— 0..-.— .S N .awo(=,vvM ausERs Avc,wo TWELVE MALE
=ABO.... lNv4 elvµ -. '.mu '�w IL \ K..carrot vaw ua FLMMERS.SERVICE. CREEKNM. ..
MR ssMH- JUNCTION Mm MNF F' ��""" PROL186°'"� .a,R„icm..N.w SERVICE
ew .TNREE 1T/EPATON TAMEN SE.
ss wz T SCREENING
•TM O
"g STRUCTURE FACILITY MN F1 •
I = INFLUENT PUMP =
_ STATION 2
.--460 Aso
Iy
1
HYDRAULIC PROFILE
•
li nre.Te M.P4U{ER �0e GROG D101iter.tellatl a. o OECEMSER:
EEeMR,n.r. L.9ENNETr '�' + by Mlehatl D. izen
NORTH CAROLINA MECHANICAL .aL 1 M,..=,•
7 c.aaosr. M.PNatES �`Is"LL' 2022.1 2.t6 PNE Rou.Evnaa HYDRAULIC PROFILE - .A� O
y99 �I o E� t7:5t:5a05'00' TWELVE MILE CREEK WRF
5= , . ` " FINAL DRAWNG•FOR REVEW PURPOSES ONLY. CHARLOTTE NORTHCAROLINA 28P3 9.0 MGD EXPANSION
�[ estwrm We M . SCE. "I.J-ieL9 NOT RELEASED FOR CONSTRUCTION '

Union County,North Carolina
Twelve Mile Creek WRF
Hydraulic Profile
Startup Rated Buildout Rated 12mgd EXP Buildout
AADF AADF AADF Peak Flow Peak Flow Peak Flow
Current Design (Was 4.50) (Was 7.50)
Plant Influent Flow mgd I 5.50 9.00 15.00' 22.50 '1'.50 3BAD I MOO' 8
Number of UV Channels= 1 1 2 2 2 3 1
Q(mgd)per UV Channel= 5.50 9.00 7.50 11.25 22.50 15.00 15.00
Number of Filters= 2 2 3 3 2 4 6
•
Q(mgd)per Filter= 2.75 4.50 5.00 7.50 11.25 7.50 7.50
•
Number of 70'diameter Clarifiers= 2 2 2 2 2 2 2 I
Number of 85'diameter Clarifiers= 2 2 2 2 2 2 2
Number of 100'diameter Clarifiers= 1 1 2 1 2 3
Q(mgd)out of 70'diameter Clarifier= 0.8 1.3 1.6 3.2 4.5 3.3 4.0
Q(mgd)out of 85'diameter Clarifier= 1.2 1.9 2.5 4.8 6.8 4.9 6.0 '
Q(mgd)out of 100'diameter Clarifier= 1.6 2.6 3.4 6.6 0.0 6.8 8.3
Q(mgd)into 70'diameter Clarifier= 1.2 2.5 3.3 4.9 6.3 4.9 5.3
Q(mgd)into 85'diameter Clarifier= 1.7 3.8 4.9 7.3 9.5 7.4 8.0
•
Q(mgd)into 100'diameter Clarifier= 2.4 5.3 6.8 10.1 0.0 10.2 11.1 •
•
Return Activated Sludge Flow % 50% 100% 100% 53% 40% 50% 33%
Return Activated Sludge Flow mgd 2.75 9.0 15.00 12.00 9.00 15.00 15.00
Total Mixed Liquor(ML)Flow mgd 8.3 18.0 30.0 34.5 31.5 45.0 60.0
NRCY Flow(4Q AADF) mgd 30.0 30.0 50.0 30.0 22.5 50.0 50.0
Total FAO Flow mgd 38.3 48.0 80.0 64.5 54.0 95.0 110.0
Total FAO Basins Available 4 4 7 4 miiml, 7 7
FAO Basins in Service 4 4 7 4 7 7
Unit Flow per Basin mgd 2.06 4.50 4.29 8.63 10.50 6.43 8.57
FAO+NRCY Flow Per Basin mgd 9.56 12.00 11.43 16.13 18.00 13.57 15.71 •
•
Grit Gritm Removalli Units Available _ 2 2 2 2 2 2
Grit Removal Units in Service 1 1 2 2liniml 2.0 2.0
Unit Flow per Grit Removal Unit mgd 5.5 9.0 7.5 11.3 22.5 15.0 22.5
Number of Force Mains Being Used 1 1 1 1 1 2 2
Flow Through 24"FM mgd 5.50 9.00 15.00 22.50 22.50 12.42 18.71
Flow Through 30"FM mgd 5.50 9.00 15.00 22.50 22.50 17.58 26.29
Number of Pumps Operating mgd 1 1 2 3 3
Flow Thru Each Pump mgd 5.5 9 7.5 7.5 7.5 •
Downstream Controlling WSE 100-Year Flood Elevation 507.34 507.34 507.34 507.34 507.34 507.34 507.34
Reaeration D/S of Weir

Piping from 10-foot Manhole to Twelve Mile Creek
Module OCCS Circular Open Channel with supercritical flow
Upstrm Inv El= 530.00 Q(mgd)= 5.5 9.0 15.0 22.5 22.5 30.0 45.0
Diameter= 48.00 in Yc(ft)- 0.86 1.10 1.42 1.74 1.74 2.01 2.47
K-ent= 0.50 Theta(rad)= 1.93 2.21 2.56 2.89 2.89 3.16 3.61
Area(sf)= 1.99 2.82 4.01 5.26 5.26 6.34 8.13
V(fps)= 4.27 4.94 5.78 6.61 6.61 7.32 8.56
Hm(ft)= 0.14 0.19 0.26 0.34 0.34 0.42 0.57
531.29 531.67 532.20 532.76 532.76 533.26 534.17
Pipe from Cascade Aerator to 10-foot Manhole
Module OCCP Circular Open Channel Profile
Invert El= 530.50 Q(mgd)= 5.50 9.00 15.00 22.50 22.50 30.00 45.00
Diameter= .-. 48.00 in Backwater(ft)= 0.79 1.17 1.70 2.26 226 2.76 3.67
Manning n= 0.013 Yc(ft)- 0.86 1.10 1.42 1.74 1.74 2 01 2.47
Length= 115 ft vn(fti= 0.78 1.00 1.30 1.61 1.61 1.90 2.43
Slope= 0.005 ft/ft Iterate 0»> 0.00 0.00 0.00 0.00 0.00 0.00 0.00
K= 1.50 Theta(rad)= 1.83 2.09 2.43 2.75 2.75 3.04 3.58
Area(sf)= 1.73 2.46 3.54 4.75 4.75 5.88 8.00
Downstream Station Actual Depth(ft). 0.86 1.17 1.70 2.26 2.26 2.76 3.67
Theta(rad)= 1.93 2.29 2.84 3.41 3.41 3.92 5.12
Area(sf)= 1.99 3.06 5.10 7.33 7.33 9.26 12.08
V(fps)= 4.27 4.54 4.55 4.75 4.75 5.01 5.76
Sf(ft/ft)= 0.0034 0.0027 0.0018 0.0016 0.0016 0.0015 0.0020
Segment Length= 12 ft Upstrm Depth(ft)= 0.85 1.10 1.63 2.20 _ 2.20 2.70 3.63
Iterate 0>>> 11.20 6.40 0.00 0.00 _ 0 00 0.00 0.00
Check>>> Solve Solve ok ok
Theta(rad)= 1.92 2.21 2.77 3.34 3.34 3.86 5.05
Area(sf)= 1.95 2.81 4.80 7.08 7.08 9.04 11.99
V(fps)= 4.36 4.96 4.83 4.92 4.92 5.13 5.81
Sf(ft/ft)= 0.0036 0.0034 0.0022 0.0017 0.0017 0.0016 0.0021
Segment Length= 23 ft Upstrm Depth(ft)_ 9,85,';:ec ,1.09 '1.38 2.08; ,,u.2 06 '" '`', "3 : >=:
Iterate 0>>> 23.00 22.92 0.17 0.00 0.00 0.00 0.00
Check>>> Solve Solve Solve ok ok ok ok
Theta(rad)= 1.92 2.20 2.51 3.20 3.20 3.74 4.91
Area(sf)= 1.95 2.77 3.84 6.53 6.53 8.59 11.78
V(fps)= 4.36 5.02 6.04 5.33 5.33 5.40 5.91
Sf(ft/ft)= 0.0036 0.0036 0.0040 0.0021 0.0021 0.0019 0.0021
Segment Length= 35 ft Upstrm Depth(ft)= 0.85 1.09 1.40 1.80 1.80 2.40 3.41
Iterate 0>>> 34.50 34.50 32.91 0.00 0.00 0.00 0.00
Check>>> Solve Solve Solve ok ok ok ok
Theta(rad)= 1.92 2.20 2.53 2.94 2.94 3.54 4.71
Area(sf)= 1.95 2.77 3.92 5.49 5.49 7.86 11.42
V(fps)= 4.36 5.02 5.92 6.34 6.34 5.91 6.10
Sf(ft/ft)= 0.0036 0.0036 0.0038 0.0034 0.0034 0.0023 0.0022
Segment Length= 46 ft Upstrm Depth(ft)= 0.83 1.09 1.40 , 1.91 1.91 >_'
Iterate 0>>> 46.61 45.92 23.47 0.00 0.00 0.00 0.00
Check>>> Solve Solve Solve ok ok ok ok
Theta(rad)= 1.89 2.20 2.53 3.05 3.05 3.61 4.77
Area(sf)= 1.89 2.77 3.92 5.93 5.93 8.12 11.54
V(fps)= 4.51 5.02 5.92 5.87 5.87 5.72 6.03
Sf(ftlft)= 0.0039 0.0036 0.0038 0.0027 0.0027 0.0021 0.0022
Hm(ft)= 0.47 0.59 0.82 0.80 0.80 0.76 0.85
EGUHGL at 532.70 533.14 533.84 534.32 534.32 534.81 535.94
Freeboard to weir(in) 27.7 22.3 14.0 8.1 8.1 2.3 -11.3
Weir#3 in Cascade Aerator
Module WS Sharp Crested Weir
Weirs in Service= 1 1 1 1 2 2
Number of Weirs= 2.00 Weir Length= 5.00 5.00 5.00 5.00 5.00 10.00 10.00
Weir Length= 5.00 ft Q(mgd)= 5.50 9.00 15.00 22.50 22.50 30.00 45.00
Weir Elev= ,535.00 ft Hw(ft)= 0.64 0.89 1.26 1.65 1.65 1 26 1 85
Length= 5.00 ft Weir Submergence(H>)= 0.00 0.00 0.00 0.00 0.00 0.00 0.94
Cw= 3.3 <If Subm>Hi(ft)= 0.00 0.00 0.00 2.12 1.91 0.00 1.85
<If Subm>Iterate 0»> 0.000 0.000 0.000 0.000 0.000 0.000 0.000
Check>>> Not Subm Not Subm Not Subm Not Subm Not Subm Not Subm ok
535.64 535.89 536.26 536.65 536.65 536.26 536.85

Freeboard to weir(in} 22.3 19.3 14.9 10.3 10.3 14.9 7.8

Weir#2 in Cascade Aerator
Module WS Sharp Crested Weir
Weirs in Service= 1 1 1 1 1 2 2
Number of Weirs= 2.00 Weir Length= 5.00 5.00 5 00 5 00 5 00 10.00 10.00
Weir Length= 5.00 ft Q(mgd)= 5.50 9.00 15.00 22.50 22.50 30.00 45.00
Weir Elev= 537.50 ft Hw(ft)= 0.64 0 89 1.26 1.65 1.65 1.26 1.65
Length= 5.00 ft Weir Submergence(H2)= 0 00 0 00 0.00 0.00 0.00 0.00 0.00
Cw= 3.3 <If Subm>Hi(ft)= 0.00 0.00 0.00 0.00 0.00 0.00 0.00
<If Subm>Iterate 0>» 0.000 0.000 0.000 0.000 0.000 0.000 0.000
Check»> Not SubIIi Not Subm Not Subm Not Sube `:ot Subm
538.14 538.39 538.76 539.15 _ 539.15 538.76 539.15
'Freeboard to weir(in) 25.3 22.3 17.9 13.3 13.3 17.9 13.3
Weir upstream of Cascade Aerator
Module WS Sharp Crested Weir
Weirs in Service= 1 1 1 1 1 2 2
Number of Weirs= 2 Weir Length= 4.00 4.00 4.00 4 00 4.00 8.00 8.00
Weir Length= 4.00 ft Q(mgd)= 5.50 9.00 15.00 22.50 22.50 30.00 45.00.
Weir Elev= 540.25 ft Hw(ft)= 0.75 1.04 1.46 1.91 1.91 1.46 1.91
Length= 4.00 ft Weir Submergence(H2)= 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Cw= 3.3 <If Subm>Hi(ft)= 0.00 0.00 0.00 .00 0.00 1;0 00
<If Subm>Iterate 0»> 0.000 0.000 0.000 0.000 0.000 0.000 0.000
Check»> Not Subm .. Not Subm Not Subs. lot Subm Not Subm Not Subm
541.00 541.29 541.71 542.16 542.16 541.71 542.16
UV Channel Effluent Pipe
Module PIPH Piping by Hazen-Williams Equation 36 36
60 60
Diameter= 48 in Q(mgd)= 5.50 9.00 15.00 22.50 22.50 30.00 45.00
Length= 100 ft V(fps)= 0.68 1.11 1.85 2.77 2.77 2.36 3.55
Hazen&Will.C= 120 Hv(ft)= 0.01 0.02 0.05 0.12 0.12 0.09 0.20
Minor Loss K's: Entr/Exit l.s Hf(ft)= 0.00 0.01 0.03 0.06 0.06 0.03 0.07
45 Bends Hm(ft)= 0.01 0.03 0.10 0.21 0.21 0.16 0.35
90 Bends 0.3 HL(ft)= 0.02 0.04 0.12 0.27 0.27 0.19 0.42
Sum K= 1.8
541.01 541.33 541.83 542.43 542.43 541.90 542.58
UV Trough Effluent Trough"Channel" [Trojan Design with additional depth]
Module OCLI Rectangular Lateral Inflow Channel
Number of Troughs= 4 4 4 4 4 4 4
Invert El= 539.33 ft 4(mgd) 1 38 2.25 1 88 2 81 3.75 3.75
Width= 1 ft Backwater(ft)= 1.68 2.00 2.50 3.10 3.10 2.56 3.25
Length= '8 ft Yc(ft)= 0.52 0.72 0.64 0.84 1.33 1.01 1.01
Slope= 0.0000 ft/ft Actual Depth(ft)= 1.68 2.00 2.50 3.10 3.10 2.56 3.25
Manning n= 0.015 V-end(fps). 1.27 1.74 1.16 1.41 2.81 2.26 1.79
Hf(ft)- 0.00 0.00 0.00 0.00 0.01 0.00 0.00
Yu(ft)= 1.73 2.09 2.54 3.16 3.34 2.72 3.35
541.06 541.43 541.87 542.49 542.67 542.05 542.68
'Freeboard to weir(in) 17.2 12.9 7.5 0.1 -2.1 5.3 -2.2
UV Trough Effluent Trough"Channel" [Wedeco Design check(not linked)]
Module OCLI Rectangular Lateral Inflow Channel
I Number of Troughs= 9 9 9 9 9 9 9
Invert El= -539.33 ft Q(mgd)= 0.61 1.00 0.83 1.25 2.50 1.67 1.67
Width= 0.55 ft Backwater(ft)= 1.68 2.00 2.50 3.10 3.10 2.56 3.25
Length= 8 ft Yc(ft)= 0.45 0.63 0.55 0.73 1.15 0.88 0.88
Slope= 0.0000 ft/ft Actual Depth(ft)= 1.68 2.00 2.50 3.10 3.10 2.56 3.25
Manning n= 0.015 V-end(fps)= 1.02 1.41 0.94 1.14 2.27 1.83 1.44
Hf(ft)- 0.00 0.00 0.00 0.00 0.01 0.01 0.00
Yu(ft)= 1.71 2.06 2.52 3.14 3.26 2.67 3.31
541.05 541.40 541.86 542.47 542.59 542.00 542.65
'Freeboard to weir(in) 17.4 13.3 7.7 0.3 -1.1 6.0 -1.8
UV Effluent Level Control Weir/Troughs Trojan Design]
Module WS Sharp Crested Weir
Weir Elev= 542.50 ft Q(mgd)= 5.50 9.00 7.50 11.25 22.50 15.00 15.00
Length= 72.00 ft Hw(ft)= 0.11 0.15 0.13 0.17 0.32 0.21 0.26
Cw= 3.3 Weir Submergence(H2)= 0.00 0.00 0.00 - 0.00 0.17 0.00 0.18

<If Subm>H1(ft)= 0.00 0.00 0.00 0.00 0.32 0.00 0.26
<If Subm>Iterate 0»> 0.000 0.000 0.000 0.000 0.000 0.000 0.000
Check»> Not Subm opt Subm Not m Not Subm Not Subm et
542.61 542.65 542.63 542.67 542.82 542.71 542.76
UV System [Trojan Design]
Q(mgd)= 5.50 9.00 7.50 11.25 22.50 15.00 15.00
HL= 0.08 0 22 0.16 0.35 1.40 0.62 0.62
HGL 542.69 542.87 542.79 543.02 544.21 543.33 543.38

UV Influent Isolation Valve
Module PIPH Piping by Hazen-Williams Equation
Diameter= 36 in Q(mgd)= 5.50 9.00 7.50 1125 y 22.50 15.00 15.00
Length= 0 ft V(fps)= 1.20 1.97 1.64 2.46 4.93 3.28 3.28
Hazen&Will.C= 120 Hv(ft)= 0.02 0.06 0.04 0.09 0.38 0.17 0.17
Minor Loss K's: Entr/Exit Hf(ft)= 0.00 0.00 0.00 0.00 0.00 0.00 0.00
45 Bends Hm(ft)= 0.01 0.02 0.01 0.03 0.11 0.05 0.05
Valve 0.3 HL(ft)= 0.01 0.02 0.01 0.03 0.11 0.05 0.05
SumK= 03
542.70 542.89 542.80 543.05 544.33 543.38 543.43
UV Influent Pipe from Header to UV
Module PIPH Piping by Hazen-Williams Equation
No.of pipes b/w F&UV 2 2 2 2 2 2 3
Diameter= 30 in Q(mgd)= 2.75 4.50 7.50 11.25 11.25 15.00 _ 15.00
Length= 22 ft V(fps)= 0.87 1.42 2.36 3.55 3.55 4.73 4.73
Hazen&Will.C= 120 Hv(ft)= 0.01 0.03 0.09 0.20 0.20 0.35 0.35
Minor Loss K's: Entr/Exit 1 Hf(ft)= 0.00 0.01 0.02 0.03 0.03 0.06 0.06
Bends 0.2 Hm(ft)= 0.02 0.06 0.17 0.38 0.38 0.68 0.68
Branch Tee 0.75 HL(ft)= 0.03 0.07 0.19 0.41 0.41 0.73 0.73
Sum K= 1.95
542.72 542.96 542.99 543.47 544.74 544.12 544.17
Total Flow 5.50 9.00 15.00 22.50 22.50 30.00 45.00
Flow to 30"Pipe 1 2.23 3.63 5.76 8.65 8.65 11.53 17.29
Flow to 30"Pipe 2 2.23 3.63 5.76 8.65 8.65 11.53 17.29
Flow to 24"Pipe 1.04 1.73 3.47 5.21 5.21 6.95 10.43
Head for 30"Route 542.74 543.00 543.10 543.71 544.99 544.56 545.15
Head for 24"Route 542.73 542.99 543.10 543.71 544.99 544.56 545.15
Difference in Head 0.01 0.02 0.00 0.00 0.00 0.00 0.00
30"Pipe Route
UV Influent Pipe from Filter Effluent Channel to Header
Module PIPH Piping by Hazen-Williams Equation
Diameter= 30 in Q(mgd)= 2.23 3.63 5.76 8.65 8.65 11.53 17.29
Length= 37 ft V(fps)= 0.70 1.15 1.82 2.73 2.73 3.63 5.45
Hazen&Will.C= 120 Hv(ft)= 0.01 0.02 0.05 0.12 0.12 0.21 0.46
Minor Loss K's Entr/Exit 0.5 Hf(ft)= 0.00 0.01 0.02 0.03 0.03 0.06 0.13
Bends 0.3 Hm(ft)= 0.01 0.04 0.09 0.21 0.21 0.38 0.85
Branch Tee 0.75 HL(ft)= 0.02 0.04 0.11 0.25 0.25 0.44 0.98
Run Tee 0.3
Sum K= 1.85
542.74 543.00 543.10 543.71 544.99 544.56 545.15
24"Pipe Route
UV Influent Pipe from Filter Effluent Channel to Header
Module PIPH Piping by Hazen-Williams Equation
Diameter= 30 in Q(mgd)= 1.04 1.73 3.47 I 5.21 5.21 6.95 10.43
Length= 39 ft V(fps)= 0.33 0.55 1.09 1.64 1.64 2.19 3.29
Hazen&Will.C= 120 Hv(ft)= 0.00 0.00 0.02 0.04 0.04 0.07 0.17
Minor Loss K's: Entr/Exit Hf(ft)= 0.00 0.00 0.01 0.01 0.01 0.02 0.05
Reducer 0.3 Hm(ft)= 0.00 0.01 0.02 0.05 0.05 0.09 0.20
Branch Tee HL(ft)= 0.00 0.01 0.03 0.06 0.06 0.11 0.25
Run Tee 0.9
Sum K= 1.2
542.73 542.97 543.02 543.53 544.81 544.23 544.42
UV Influent Pipe from Filter Effluent Channel to Header
Module PIPH Piping by Hazen-Williams Equation
Diameter= 24 in Q(mgd)= 1.04 1.73 3.47 5.21 5.21 6.95 10.43
Length= 23 ft V(fps)= 0.51 0.85 1 71 2.57 2.57 3.42 5 14
Hazen&Will.C= 120 Hv(ft)= 0.00 0.01 0.05 0.10 0.10 0.18 0.41
Minor Loss K's: Entr/Exit 0.5 Hf(ft)= 0.00 0.00 0.01 0.03 0.03 0.04 0.09
Bends 0.3 Hm(ft)= 0.01 0.02 0.07 0.16 0.16 0.28 0.64
Branch Tee 0.75 HL(ft)= 0.01 0.02 0.08 0.18 0.18 0.32 0.73

Run Tee
Sum K= 1.55
542.73 542.99 543.10 543.71 544.99 544.56 545.15

Filter Effluent Collection Channel
Module OCLI Rectangular Lateral Inflow Channel
Invert El= 542.58 ft Q(mgd)==.'r•5,, 3i •. ..., + Q' ?,b;»' WkIEMMVrElttfrSW5DSA
Width= 3 ft Backwater(ft)= 0.16 0.42 0.51 1.13 2.41 1.97 2.56
Length= 46 ft Sc(ft)= 0.40 0.55 0.59 0.77 1.01 0.77 0.77
Slope= 0.0000 ft/ft Actual Depth(ft)= 0.40 0.55 0.59 1.13 2.41 1.97 2.56
Manning n= 0.015 V-end(fps)= 3.57 4.21 4.36 3.42 2.41 1.96 1.51
Hf(ft)- 0.09 0.09 0.09 0.03 0.01 0.01 0.00
Yu(ft)= 0.78 1.05 1.12 1.48 2.59 2.10 2.64
543.36 543.63 543.70 544.07 545.17 544.68 545.22
'Freeboard to wee(in) 30 26 26 21 8 14 7
Filter Effluent Weir
Module WS Sharp Crested Weir
Weir Elev= 545,83 ft Q(mgd)= 2.75 4.50 5.00 7.50 11.25 7.50 7.50
Length= 14.5 ft Hw(ft)= 0.20 0 28 0 30 0 39 0.51 0.39 0 39
Cw= 3.3 Weir Submergence(H2)= 0.00 0.00 0 00 0.00 0.00 0.00 0.00
elf Subm>Hi(ft)= 0.00 0.00 0.00 0.00 0.00 0.00 1 98
<If Subm>Iterate 0>>> 0.000 0.000 0 000 0.000 0.000 0.000 0-000
Check rw> Not Subm Not S, Nc. Not Subm Not S, Nc'.
546.03 546.11 546.13 546.22 546.34 546.22 546.22
Disc Filter Effluent Pipe
Module PIPH Piping by Hazen-Williams Equation
Diameter= 30 in Q(mgd)= 2.75 4.50 5.00 7.50 11.25 7.50 7.50
Length= 20 ft V(fps)= 0.87 1.42 1.58 2.36 3.55 2.36 2.36
Hazen&Will.C= 100 Hv(ft)= 0.01 0.03 0.04 0.09 0.20 0.09 0.09
Minor Loss K's: Entr/Exit 1 Hf(ft)= 0.00 0.01 0.01 0.02 0.04 0.02 0.02
90 Bends Hm(ft)= 0.01 0.04 0.05 0.10 0.23 0.10 0.10
Branch Tee HL(ft)= 0.02 0.05 0.06 0.12 0.28 0.12 0.12
Valves 0.2
Sum K= 12
546.05 546.16 546.19 546.35 546.62 546.35 546.35
'Freeboard to weir(in) 6 5 5 3 0 3 3
Disc Filter Internal Weir
Module WS Sharp Crested Weir
Weir El.= 546.58 ft Q(mgd)= 2.75 4.50 5.00 7.50 11.25 7.50 7 50
Assume Length*= 7.5 ft Hw(ft)= 0.31 0 43 0.46 0.60 0 79 0 60 0 60
Cw= 3.3 Weir Submergence(H2)= 0 00 0 00 0.00 0.00 0 04 0.00 0.00
<If Subm>Hi(ft)= 0.00 0.00 0.00 0.78 0.79 0.00 0.00
*Specified max.HL of 1.00 ft elf Subm>Iterate 0>>> 0 000 0.000 0.000 0.000 0.000 0.000 0.000
Check»> 1 Not Subm Not Subm Not Subm m Noy.
546.89 547.01 1 547.04 547.18 547.37 . 547.18 547.18
Disc Filter Influent Pipe
Module PIPH Piping by Hazen-Williams Equation
Diameter= 30 in Q(mgd)= 2 75 4.50 5.00 7.50 11.25 7.50 7.50
Length= 6 ft V(fps)= 0.87 1 42 1.58 2.36 3.55 2.36 2.36
Hazen&Will.C= 100 Hv(ft)= 0.01 0.03 0.04 0.09 0.20 0.09 0.09
Minor Loss K's: Entr/Exit 1.5 Hf(ft)= 0.00 0.00 0.00 0.01 0.01 0.01 0.01
Bends Hm(ft)= 0.02 0.05 0.07 0.15 0.33 0.15 0.15
Branch Tee HL(ft)= 0.02 0.06 0.07 0.15 0.35 0.15 0.15
Valves 0.2
Sum K= 1.7
546.91 547.06 547.11 547.34 547.72 547.34 547.34
'Freeboard to weir(in) 10 8 8 5 0 5 5
Proposed High Level Setpoint= 548.00 548.00 548.00 548.00 548.00 548.00 548.00
Freeboard to High Level Setpoint= 13.08 11.22 10.69 7.96 3.38 7.96 7.96
Filter Influent Weir
Module WS Sharp Crested Weir
Existing Weir El.- 547.75 ft
New Weir El.- 547.75 ft Q(mgd)= 2.75 4.50 5.00 7.50 11.25 7.50 7.50
Length= 14.5 ft Hw(ft)= 0.20 0.28 0.30 0.39 0.51 0.39 0.39
Cw= 3.3 Weir Submergence(H2). 0.00 0.00 0.00 0.00 0.00 0.00 0.00

<If Subm>H (ft)= 0.00 0.00 0.00 0.00 0.00 0.00 0.00
<If Subm>Iterate 0»> 0.000 0.000 0.000 0.000 0.000 0.000 0.000
Check»> :Subm Not Subm Not Subm Not Subm Not Subm Not Subm Not
547.95 548.03 548.05 548.14 548.26 548.14 548.14

Filter Influent Collection Channel
Module OCLI Rectangular Lateral Inflow Channel
Invert El= 542.58 ft Q(mgd)= 2.75 4.50 5.00 7.50 11.25 7010 7.50
Width= 3 ft Backwater(ft)= 5.37 5.44 5.46 5.56 5.68 5.56 5.56
Length= 43 ft Yc(ft)= 0.40 0.55 0.59 0.77 1.01 0.77 0.77
Slope= 0.0000 ft/ft Actual Depth(ft)= 5.37 5.44 5.46 5.56 5.68 5.56 5.56
Manning n= 0.015 V-end(fps)= 0.26 0.43 0.47 0.70 1.02 0.70 0.70
Hf(ft)- 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Yu(ft)= 5.37 5.45 5.47 5.57 5.71 5.57 5.57
547.95 548.03 548.05 548.15 548.29 548.15 548.15
Use this section for flows up to 30.0 MGD
Total Flow 5.50 9.00 15.00 22.50 22.50 30.00
Flow to 30"Pipe 3.38 5.54 9.23 13.83 13.83 18.44
Flow to 24"Pipe 2.12 3.46 5.77 8.67 8.67 11.56
Head for 30"Route 548.01 548.18 548.46 549.05 549.19 549.74
Head for 24"Route 548.01 548.18 548.46 549.05 549.19 549.74
Difference in Head 0.00 0.00 0.00 0.00 0.00 0.00
30"Route
Filter Influent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 30 in Q(mgd)= 3.38 5.54 9.23 13.83 13.83 18.44
Length= 41 ft V(fps)= 1.07 1.75 2.91 4.36 4.36 5.81
Hazen&Will.C= 100 Hv(ft)= 0.02 0.05 0.13 0.30 0.30 0.52
Minor Loss K's: Exit 1 Hf(ft)= 0.01 0.02 0.06 0.13 0.13 0.22
90 Bends 0.3 Hm(ft)= 0.05 0.12 0.34 0.77 0.77 1.36
Branch Tee 1 HL(ft)= 0.06 0.15 0.40 0.90 0.90 1.58
BFV 0.3
' SUM K= 2.6
548.01 548.18 548.46 549.05 549.19 549.74
24"Route
Filter Influent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 24 in Q(mgd)=I 2.12 3.46 5.77 8.67 8.67 11.56
Length= 41 ft V(fps)= 1.04 1.71 2.84 4.27 4.27 5.70
Hazen&Will.C= 100 Hv(ft)= 0.02 0.05 0.13 0.28 0.28 0.50
Minor Loss K's: Exit 1 Hf(ft)= 0.01 0.03 0.08 0.16 0.16 0.27
90 Bends 0.3 Hm(ft)= 0.04 0.12 0.33 0.74 0.74 1.31
Branch Tee 1 HL(ft)= 0.06 0.15 0.40 0.90 0.90 1.58
Valves 0.3
Sum K= 2.6
548.01 548.18 548.46 549.05 549.19 549.74
Use this section for flows greater than 30.0 MGD
Total Flow 45.00
Flow to 30"Pipe 1 17.13
Flow to 30"Pipe 2 17.13
Flow to 24"Pipe 10.74
Head for 30"Route 549.52
Head for 24"Route 549.52
Difference in Head 0.00
30"Route
Filter Influent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 30 in Q(mgd)= 17.13
Length= 41 ft V(fps)= 5.40
Hazen&Will.C= 100 Hv(ft)= 0.45
Minor Loss K's: Exit 1 Hf(ft)= 0.19
90 Bends 0.3 Hm(ft)= 1.18
Branch Tee 1 HL(ft)= 1.37
Valves 0.3
Sum K= 2.6

f 549.52
24"Route
Filter Influent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 1 in Q(mgd)= 10.74
Length= 4 ft V(fps)= 5.29
Hazen&Will.C= 100 Hv(ft)= 0.43
Minor Loss K's: xit 1 Hf(ft)= 0.24
90 Bends 0.3 Hm(ft)= 1.13
Branch Tee 1 HL(ft)= 1.37
Valves 0.3
Sum K= 26
549.52

SECONDARY CLARIFIERS&PIPING
gty Description Surf.Area Ratio
Existing 70'diameter clarifiers distribution weir length(feet)= 2.94 2 Clar.1-2 3848.45 0.49
Existing 85'diameter clarifiers distribution weir length(feet)= 4.34 2 Clar.5-6 5674.50 0.72
100'diameter clarifiers distribution weir length(feet)= 6.00 1 Clar.3-4 7853.98 1.00
Total distribution weir length(feet)= 20.55
FLOW PATH FROM FILTERS TO CLARIFIERS 1&2
Secondary Clarifier 1 Effluent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 16 in Q(mgd)=1 0.78 1.27 1.64 3.18 4.50 3.28 4.01
Length= ' 175 ft V(fps)= 0.86 1.41 1.82 3.53 4.99 3.63 4.44
Hazen&Will.C= 100 Hv(ft)= 0.01 0.03 0.05 0.19 0.39 0.21 0.31
Minor Loss K's: ntrance 0.5 Hf(ft)= 0.06 0.14 0.23 0.77 1.47 0.82 1.19
Bends 0.5 Hm(ft)= 0.03 0.07 0.12 0.44 0.89 0.47 0.71
Branch Tee 1 HL(ft)= 0.08 0.21 0.35 1.22 2.36 1.29 1.89
Thru Tee 0.3
Valves 1
Sum K= 2.3
548.09 548.39 548.80 550.27 551.55 551.03 551.42
Secondary Clarifier 1 Launder
Module OCLI Rectangular Lateral Inflow Channel
Invert El= 552.50 ft Q(mgd)= 0.39 0.64 0.82 1.59 2.25 1.64 2.00
Width= 2 ft Backwater(ft)= -4.41 -4.11 -3.70 -2.23 -0.95 -1.47 -1.08
Length= 113 ft Yc(ft)= 0.14 0.20 0.23 0.36 0.46 0.37 0.42
Slope= 0.0020 ft/ft Actual Depth(ft). 0.14 0.20 0.23 0.36 0.46 0.37 0.42
Manning n=I
0.015 V-end(fps)= 2.13 2.51 2.73 3.41 3.82 3.44 3.68
Hf(ft)- 0.28 0.27 0.26 0.26 0.26 0.26 0.26
Yu(ft)= 0.34 0.42 0.48 0.70 0.86 0.71 0.80
_ 553.07 553.15 553.20 553.42 553.59 553.43 553.53
TOP OF WALL EL 554.93 Freeboard to Clarifier Wall(in)= 22 21 21 18 16 18 17
Secondary Clarifier 1 V-Notch Weir
Module WV V-Notch Weir
Weir El= 853.31 ft Q(mgd)= 0.78 1.27 1.64 _ 3.18 4.50 3.28 4.01
N Notches= 440 Hw(ft)= 0.07 0.08 0.09 0.11 0.13 0.12 0.13
Depth of Notch= 2.5 in Weir Submerged? - No Yes Yes
Notch Overtopped? No No No Yes
553.38 553.39 553.40 553.54 553.72 553.55 553.65
Freeboard to V-Notch(in)= 3 2 1 -1 -3 -1 -3
SCI Energy Dissipating Inlet
Module MFR Manufacturer Head Loss Info
Reference Q= 7.3 mgd Q(mgd)= 1.17 2.54 3.28 4.88 6.30 4.92 5-35
Reference HL= 0.25 ft HL(ft)= 0.01 0 03 0 05 011 019 011 013
EGL=HGL 553.38 553.42 553.45 553.65 553.90 553.66 553.79
Center Column
Module SCPC Secondary Clarifier Pier with concentric RAS pipe
Pier ID= 30 in Q(mgd)= 1.17 2.54 3.28 4.88 6.30 4.92 5.35
RAS Pipe OD= 14 in
Length= 14 ft V(fps)= 0.47 1.03 1.32 1.96 2.54 1.98 2.15
Manning n= 0.015 Hv(ft). 0.00 0.02 0.03 0.06 0.10 0.06 0.07
SumK= 1.5 Hf(ft)= 0.00 0.01 0.01 0.02 0.04 0.02 0.03
Flow Area(sf)= 3.84 sf Hm(ft)= 0.01 0.02 0.04 0.09 0.15 0.09 0.11
Rh= 0.333333333 ft HL(ft)= 0.01 0.03 0.05 0.11 0.19 0.12 0.14
EGL a HGL 553.39 553.45 553.50 553.76 554.09 553.78 553.92
Secondary Clarifier 2 Influent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 18 in Q(mgd)=I. 1.17 I 2.54 I 3.28 I 4.88 I 6.30 I 4.92 1 6,35
Length= 145 ft V(fps) 1.02 2.23 2.87 4.27 5.52 4.31 4.68

•
M O `" V O N ,<-33
V 01 N b /0 O O O O 7 Of N an1n -7 M O) N- C N O O Yf (0 CO N. Cl M N N 1`.. N CO
0") 1.-- 0) N- 0 M (3) O .0Q V) ^ en co CO co O co co O r N n c0 O O O O C) • N (O O M V O • N co M N V)
O 0 0 H U O C) a o 0 Y) )O 4 6 4 0 0 C) O N Oo Oo 0 0 0 1 N co C) ,- O N - V O C) 0 0 N
Z N
E co m N N U
N (CD 00 CO V 0 0) c0 O O O U) O O) (O N (00 O O CO O I` O O O O O O n R M V N N OO)) t• - N- N N 7 ?
O n N O) (.j - O
O 0 0 O o 0 •Q N `? C) 0 0 0 0 N 0 0 0 0 N (A 0 0 0 0 H r- M O C) 0 0
an
10 d O V 0) O M N-
n n CO (O a 06 O O O 7 O )n O N N M V O M N- O O O O co CO 7 c0 CO V N U) M I- 0) in co
O O N M co M O 0 0 0 0 co n O IT O O O O m N (h 0 0 0 0 0 0) • 0) N O Cr) 0) .- .- O O O 0j
O - N N O 0 a 6 0 M m a 0 0 0 0 - 0 U) O O O O O O 3 N 0 0 0 0 3 O N 0 0 0 0
Z
H
co n (O M �l O in 0 0 0 D c) O (O O V N N M O O O O ,- (h 0) (O N CO (h 00 O V 'T CO O
N (O h V N CO 00 0 0 o U) N` (0 N- (O O O c0 O 1- N co )O O O O O or; c0 (n e- M V O) N (N N - M 0)
O 0 0 - H V O O a C) .O N '(1' V' O v 0 0 0 0 N N O O O O O 3 ,_ Nh O O O O 1 CJ 0 0 0 0 4
Z
cors N N en V
N- N 0 N r O cO O O O co co O co in M CO ( O N O O a N N- C. O (O (O 1` tD U) (n N� V . O
M v.) (D N CO O O 00 (n r N a (O a O O No 1-: N O 00 O O O CO • (O A- N O N a a0 00 O O CD N- CO
O O O O an (h 0 0 0 6 H M 4- 6 'V O O O O U) N O O O O O 4 7- Ni 0 0 0 0 3 ir) 0 0 0 0 I
in
0 - N O CO N- 1'9
co O CO C N 0 0 0 D (0 ' O O) O (O M co u'i N 0 0 0 0 0 (0 .- (h n N CO N 0 C) M -q N n M
O N N 0 /0 (n O O O U) N- a M 0 (p �t O r m 0? N 0 0 0 0 0j 'a V C 0 0 0 0j N-V O O O O 0j
o O O O H N O O O U N V O V 0 0 0 0 N O O O CI C) O 1 (0 - 6 6 C O 1 V:- O C) C) C) 3
Z
co M n V 1--
N (O 0) a N- M 0 0 0 D M Is co O 40 O CO N 0 M OI (0 N O 0 0 0 0 N (O M M O O 00 '- N M 0
0000 (h M 0 0 8 (n N: , ON OO (0 NO N M C N 0000 CO 0) a000OO co N- 0 0000 ap
O O O O H O 0 0 - 0 I0 "- 4 O 4 0 0 0 0 a O O O O O O 3 M O O O O O 1 N 0 0 0 0 0 1
an co
II 11 II II II II II n II II II II 11 ii II II — r II II II II II II II II II II II II II II II 11 II II
ti
V V V V m V i V o Y v .F.a ( ink - 0 a c u, m
x' x i x a = c = u E : > a x o o E > x x = x E x x = x E x x = x
m E « d 3 O o y 0 U' d
E E v y
io a 0 N U '8 O O ,CO
N N m Q U j > i
3 V R LL c W c iu 0)cr W
N (_gyp 'a v) 'ay C v)
a E a E _a E
d y m m E
0 M 0) N- i= ` C J C M IO O C CI (h O (O 1 N N
0 O N '� U = W 7 3 O ' O O O L 3 O O O C
U � c m r = . n g E ro E E y Er E > a •
O II 0 y 0O m , N N O O J 0' W N • (O O y II W N (O O O II
Y ,_▪ h n ni m U N () < (0 W :� )A..,-_ O Y (O N (h (n . Y W N M N- .- Y a
• y y E E 0 '[ W MI U c �, ::.- U E C �, E �, )H E m
lil c c 3U m � r ma 3a c - o > >
_ mmy � � n y � $ I- � c 0 � c � mm m � U � m
C p m > 0 Cl) « gg W < a L>l V•a D m0 < a J N v
lurnv > (n 10 �L g a mm a CCrnm : a cr �
II W II II 11 II 11 F 47 II II u Y II II II ( II II II tr.
U y G _ u O W r. a c C y'Ij LL y U y y U (n m O U y •m
3 >a s O U
co 2 v I E d y U = U = U
y J E a) y
0 J E m co
m EL- co J
« LL a ❑ (t) 3 ❑ ^o _, mc3 y N 3 ix to ca.
92 O x Cj N O C j N O C ? 7 0 C O y > N C NC O N C 0N C ena a a. I u a u
I di 0 n 2 a ( x � (O x2 12 2Z Z2 O (OZ co
0 0
Z J
U.

Module PIPH Piping by Hazen-Williams Equation
Diameter= 24 in Q(mgd) 1.61 2.64 3.40 6.60 0.00. 6.80 , ,,w$.32'
Length= 20 ft V(fps)= 0.79 1.30 1.68 3.25 0.00 3.35 4.10
Hazen&Will.C= 110 Hv(ft)= 0.01 0.03 0.04 0.16 0.00 0.17 0.26
Minor Loss K's. Reducer 0.1 Hf(ft)= 0.00 0.01 0.01 0.04 0.00 0.04 0.06
Branch Cross 1.5 Hm(ft)= 0.02 0.06 0.10 0.39 0.00 0.42 0.63
Entrance 0.5 HL(ft)= 0.03 0.07 0.12 0.43 0.00 0.46 0.69
BFV? 0.3
Sum K= 2.4
548.09 548.40 548.95 550.35 549.67 551.61 552.22
Secondary Clarifier 4 Drop Box
Module CCR Rectangular Closed Conduit by Mannings Equation
Width= 3 ft Q(mgd)=''" 1.61 2.64 ! 3.40 6.60 0.00 6.80 8.32
Height= 5 ft V(fps)= 0.17 0.27 0.35 0.68 0.00 0.70 0.86
Length= 3 ft Hv(ft)= 0.00 0.00 0.00 0.01 0.00 0.01 0.01
Manning n ,;R;-4 }5 Hf(ft)= 0.00 0.00 0.00 0.00 0.00 0.00 0.00
SumK '' ' :i'S Hm(ft)= 0.00 0.00 0.00 0.01 0.00 0.01 0.01
HL(ft)= 0.00 0.00 0.00 0.01 0.00 0.01 0.01
548.09 548.40 548.95 550.36 549.67 551.61 552.23
Secondary Clarifier 4 Launder
Module OCLI Rectangular Lateral Inflow Channel
Invert t =-f 4(mgd)= 01.91 1.32 1.05 3630 0.00 61 .23
Width= ft Backwater(ft). -1.91 -1.60 -1.05 0.36 -0.33 1.61 2.23
length= ft Yc(ft)= 0.20 0.27 0.33 0.51 0.00 0.52 0.59
Slope= 0.0100 ft/ft Actual Depth(ft). 0.20 0.27 0.33 0.51 0.00 1.61 2.23
Manning n= V-end(fps)= 2.52 2.97 3.23 4.03 #DIV/0! 1.30 1.15
Hf(ft)- 0.36 0.35 0.34 0.34 #DIV/0! 0.01 0.01
Yu(ft)= -0.27 -0.25 -0.22 -0.01 #DIV/0! 0.11 0.70
HGL 551.33 551.35 551.38 551.59 0DIV/0' 551.71 552.30
TOP OFWALL-EL 555.60" Freeboa"r`d to Clarifier Wall(in)= 44 44 43 41 #DIV/0l 40 32
Secondary Clarifier 4 V-Notch Weir
Module WV V-Notch Weir
Weir El= 552.50 ft Q(mgd)= 1.61 2.64 3.40 6.60 0.00 6.80 8.32
#Notches= 604 Hw(ft)= 0.08 0.09 0.10 0.14 0.00 0.14 0.15
Depth of Notch 2.5 in Weir Submerged? No No No No #DIV/O! No No
Notch Overtopped? No No No No No No No
552.58 552.59 552.60 552.64 #DIV/0! 552.64 552.65
Freeboard to V-Notch(in). 14 14 13 11 #DIV/0! 10 2
SCI Energy Dissipating Inlet
Module MFR Manufacturer Head Loss Info
Reference Q= 12.5 mgd Q(mgd)= 2.42 5.28 6.80 10.12 0.00 10.20 11.09
Reference HLv`05 ft HL(ft)= 0-01 0.04 0.07 0.16 0.00 0.17 0.20
EGL*HGL 552.59 552.64 552.68 552.80 #DIV/01 552.80 552.85
Center Column
Module SCPC Secondary Clarifier Pier with concentric RAS pipe
Pier ID= 36 in Q(mgd)= 2.42 5.28 6.80 10.12 0.00 10.20 11.09
RAS Pipe OD= 22 in
Length= 15 ft V(fps)= 0.85 1.84 2.38 3.53 0.00 3.56 3.87
Manning n= 0.015 Hv(ft)= 0.01 0.05 0.09 0.19 0.00 0.20 0.23
SumK= 1.5 Hf(ft)= 0.01 0.03 0.04 0.10 0.00 0.10 0.12
Flow Area(sf)= 4.43 sf Hm(ft)= 0.02 0.08 0.13 0.29 0.00 0.30 0.35
Rh= 0.291666667 ft HL(ft)= 0.02 0.11 0.18 0.39 0.00 0.40 0.47
EGL■'HGL 552.61 552.74 552.85 553.19 #DIV/01 553.20 553.31
Secondary Clarifier 4 Influent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= in Q(mgd)= 2.42 5.28 6.80 10.12. 0.00. 10 ) .,: _ '11.09:„,
Length= ft V(fps)= 0.76 1.66 2.15 3.19 0.00 3.22 3.50
Hazen&Will.C= Hv(ft)= 0.01 0.04 0.07 0.16 0.00 0.16 0.19
Minor Loss K's: Hf(ft)= 0.03 0.11 0.18 0.38 0.00 0.38 0.45

90 Bends 0.6 Hm(ft)= 0.02 0.11 0.18 0.40 0.00 0.40 0.47
45 Bends 0.9 HL(ft)= 0.05 0.22 0.36 0.77 0.00 0.79 0.92
Sum K= 2.5
552.66 552.97 553.21 553.96 #DIV/01 553.99 554.24
Secondary Clarifier 4 Influent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 24 in Q(mgd)= 2.42 .5 ,,, $.80 . 10.12 -000"°, *20. ;� 11. 9-<r>
Length= 5 ft V(fps)= 1.19 2.60 3.35 4.99 0.00 5.03 5.46
Hazen&Will.C= 110 Hv(ft)= 0.02 0.11 0.17 0.39 0.00 0.39 0.46
Minor Loss K's: Entrance 0.5 Hf(ft)= 0.00 0.01 0.01 0.02 0.00 0.02 0.03
Increaser 0.2 Hm(ft)= 0.02 0.07 0.12 0.27 0.00 0.27 0.32
HL(ft)= 0.02 0.08 0.13 0.29 0.00 0.30 0.35
Sum K= 07
552.68 553.05 553.35 554.25 #DIV/0! 554.28 554.59
MLSS Dist.Box Effluent Weir to Clarifier 4
Module WS Sharp Crested Weir
Weir Elev= 557.00 ft O(mgd)= 2.42 5.28 6.80 10.12 0.00 10.20 11.09
Length= 6 ft H,,(ft)= 0 33 0.55 0.66 0.85 #DIV/0! 0.86 0.91
Cw= 3.3 Weir Submergence(H2)= 0.00 0.00 0.00 0.00 #DIV/0! 0.00 0.00
<If Subm>Hi(ft)= 0.00 0.00 0.00 1.06 0.00 0.00 1.12
<If Subm>Iterate 0 n>> 0.000 0.000 0.000 0.000 #DIV/0! 0.000 0 000
Check en> Not Subm Not Subm Not Subm Not Subm #DIV/O! Not Subm
557.33 557.55 557.66 557.85 #DIV/01 557.86 557.91
New Distribution Gates
Module FPR Free Surface Rectangular Port
Invert El= 553.25 ft Q(mgd)= 2.42 5.28 6.80 10.12 0.00 10.20 11.09
Width= 4 ft Backwater(ft)= 4.08 4.30 4.41 4.60 #DIV/0! 4.61 4.66
Length= 6 in Yc(ft)= 0.30 0.51 0.60 0.78 0.00 0.79 0.83
No.Suppressed Contr= 0(0-3) Act.Depth(ft)= 4.08 4.30 4.41 4.60 #DIV/0! 4.61 4.66
L/P= 0.04 0.04 0.04 0.04 #DIV/0! 0.04 0.04
Cd= 0.62 0.62 0.62 0.62 #DIVIO! 0.62 0.62
V(fps)= 0.23 0.47 0.60 0.85 #DIV/0! 0.86 0.92
HL(ft)= 0.00 0.01 0.01 0.03 #DIV/0! 0.03 0.03
EGL=HGL 557.33 557.56 557.67 557.88 #DIV/0! 557.89 557.94
TOP OF WALL EL 560.00 freeboard to TOW(in)= 32 29 28 25 #DIV/0! 25 25

T
r
O
an °Q , KW °a ^ W °a (mi KW °ate K ° °ate
O [ O 7 N C O 7 N o O 7 N '; O O N 0 7 =
cp 7 W 0.0 O- j co-- 3 Oo 7 (D 1 O0 0 W X j cD
d — p W p') O W Or QD q 11 W O R. c 11 W Q Q. O 13 W Q Qo g 1 co xi
nQ r c).. m r $ �Q m d -.7 y r $ �'Z m r m �sz O
u II II II II II ~ II II II II .. II II II II II II .• II II II co no ' m
worn v A vw, W CO p CO 73
N N W CJ d .7» U (" C C ? m' T.§ - A ry1
m m m 00i d 5 m m m� _ 5. a o C °' 1
o � � Cl) S [�i c Qa c yam 0 W c o W O
0 o v, c a c c 3 C) 0 `, 0 3 'c 3 `< = 3 n t = Cf
o y fp 52O m o M N - N O. o °'
N w .+. O II N O N N N .�a WW W N RI Z ° N W N O N -. Cn W N O
,n o w V r- 01+fR,W'W': 0 )( II N O N A N II O.O O N '�' II O O O N m II y O (n 0) N m 73
7 (C C C
N a NJco O -, O (O O 0 O O O A NJ O A m
coW N Cit Cn Or 0 m — N W W w (T Cn ri (/I
o o 3 3-a 3 _7.. 37 a
F O_ v, to 3 cn v co 4
n C a a CO a m a m rn
c o Dci Dc) w v
D g, ' 0 7 0 n
m .
o i n
fJ D O O iJ O
x ?� ,<, , 3— I3 .=., ?� 3 .- 3 T. I3 I <- 3 r3 ? <� 3 r3 <�3
m n -. -_.� a x 3--m a ; mox xt 3 s x a n x a a a m � D xrx= .
u , n n u I I II II II II II II y II II II II II II II II II II II II II II II II II II II II II II II II
o _,
cn 0 O
j p co N O O N p A 00000 ..a A 0 0 0 0 0 A O O O O O N 00 (7000, A O O O O O O
N W " -' ^ O 01 p O O p N CO O O O O in ccV O O O O co 00 O O O O Co iO O 0 0 0 0 (n
cokl N Ca A co Do IOO p O O p 0 v p co V V O N NJ ' CD' 0D 0 A Ca 01 of O O O O O N 0)
(co V N
cn
j p co 1,..) 00L0 A p O O p 0 ._. A 0 0 0 0 0 - A O O O O -. A �' 0 0 0 0 O) A . . . . Do
• N NJ 0) NJ NJ v i0 p O O p W t0 0 0 O O CD j0 CO
p O O O O O co 0 0 0 4. •W O 0 O O N t0
W D - 0 0 0 N 42pOOW W A W -� A ) NJ A ( N CD V 0) 0 O 0 0 0 Nv co A CD
OD
N N
cn p co N O O .r A p O O p O N A O O O O N 0 0 0 0 -, (n A O O O O N A O O O O O N
N NJ V N N N N W p O O •p A A co O O O O N j,. co 0 0 0 co co CD 6. N CM Co 0 0 0 0 c 6
N CD W W W W W CO O O O O N 0) (O O N '' N - 0) CO CD W V o Cn 0) V — O O V V A 0 O CP p
CO A oo 0 N V
N O)
in 0 0 (..) O O O N N p O O p O A N 0000 N A O O O O W A O O O O W A O O O O O N
N A W W p W p O O p OD V 0 N N O O W J CO W NJ N cr. • f0 N N Cl) -+ in m CO O O O O CC j
CI
p 0) - 0) O) A to � O N V j Cl) O Cl) c0 N V CO A O A O co Cl) p� V 0) (D W A 0 0 0
CO A e)
Ul O O W O O O W WIp O O p 0) N O O O O W 0) A O O O O N 0) A O O O O N -` A O O O O O p
0 NJ CD A A 0 W p 0 0 p V C A G> O W V CO 0 0 0 -, V f0 A N 0 W CO boo O O W
N NJ 0) NJ O) 0) W co NO N N O Na) 00) o0) V r..) 0 V Cl) A (O J W Cn C1 - (Cl 0) A 0) (n O O O O V G)
00 N O co co
jO O O s O N 0 p O O p 0 ,( o. O O O O N p, j O O O O W N 0 0 0 Cn N A 0 0 0 0 (n
O co T Cl) A ;. p 0 0 p 0 (p N N O O A io Cl) N N V - C -+ A V A -, • CO O O O O p
N N O V -` Q) W O N N N A - W CO N N jp CO Cn O V O V (n N W A V 0) N N O p
V /J N a) A CO
o N Nn 0 0 0 0 0, n p O O p 0 O O O O N 0) cn O O O O A j O O co N A O O O O O N
N 0) O V c0 A to p p OOpOp N Cl) CO O O p cn co co CCA V0) O0) N • O •O O O O 0) V
O O CO CO N co +
O N Cl) O N A O) r N O) V N NJ W jV N VA CO Q) N N - O -' O N
to co OI co co a) w A

TOP OF WALL EL 554.00 Freeboard to Clarifier Wall(in)=I 33 I 33 I 33 I 31 I 30 I 29 I 22
Secondary Clarifier 5 V-Notch Weir
Module WV V-Notch Weir
Weir El= 552.42 ft Q(mgd)= 1.17 1.91 2.46 4.77 6.75 4.92 6.01
#Notches= 487 Hw(ft)= 0.07 0 09 0 10 0.13 0.15 0.13 0.14
Depth of Notch=1 2.5 in Weir Submerged? No No No No No
Notch Overtopped? N No No No No
552.49 552.51 552.52 552.55 552.57 552.55 552.56
IFreeboard to V-Nolgagla 14 14 14 12 11 10 3
SCI Energy Dissipating Inlet
Module MFR Manufacturer Head Loss Info
Reference Q= "' !mgd Q(mgd)=1'` 1 75 3.82 4.92 7.31 9 45 7.38 8.02
ReferenceHL= 0.25ft HL(ft)= 001 003 005 011 018 011 013
EGL :140L 552.50 552.54 552.57 552.66 552.75 552.66 552.69
Center Column
Module SCPC Secondary Clarifier Pier with concentric RAS pipe
Pier ID= 30 in Q(mgd)= 1.75 3.82 4.92 7.31 9.45 7.38 8.02
RAS Pipe OD= 18 in
Length= 14 ft V(fps)= 0.86 1.88 2.42 3.60 4.65 3.63 3.95
Manning n= 0.015 Hv(ft)= 0.01 0.05 0.09 0.20 0.34 0.20 0.24
SumK= 1.5 Hf(ft)= 0.01 0.03 0.05 0.12 0.20 0.12 0.14
Flow Area(sf)= 3.14 sf Hm(ft)= 0.02 0.08 0.14 0.30 0.50 0.31 0.36
Rh= 0.25 ft HL(ft)= 0.02 0.11 0.19 0.42 0.70 0.43 0.50
EGL=HGL 552.52 552.65 552.76 553.08 553.45 553.09 553.20
Secondary Clarifier 6 Influent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 24 in Q(mgd)= 1,7[t_ , A . ' . 4.99 ,_.-. .T> ,...., F -Si :fie,_ A;30; .; t ;
Length= 384.2 ft V(fps)= 0.86 1.88 2.42 3.60 4.66 3.63 3.95
Hazen&Will.C= 110 Hv(ft)= 0.01 0.05 0.09 0.20 0.34 0.21 0.24
Minor Loss K's. Entr/Exit 1.5 Hf(ft)= 0.07 0.28 0.44 0.92 1.48 0.94 1.10
90 Bends 0.3 Hm(ft)= 0.03 0.15 0.25 0.54 0.91 0.55 0.65
45 Bends 0.9 HL(ft)= 0.10 0.43 0.69 1.47 2.39 1.49 1.75
Sum K= 2.7
552.62 553.08 553.45 554.55 555.84 554.58 554.95

MLSS Dist.Box Effluent Weir to Clarifier 6
Module WS Sharp Crested Weir
Weir Elev= 557.00ft Q(mgd)=__ _1.75 3.82 4.92 7.31 9.45 7.38 8.02
Length= 4.34 ft HN,(ft)= 0.33 0.55 0.66 0.85 1.01 0.86 0.91
C,,,= 3.3 Weir Submergence(H2)= 0.00 0.00 0.00 0.00 0.00 0.00 0.00
<If Subm>H1(ft)= 0.00 0.00 0.00 0.00 0.00 0.00 0.94
<If Subm>Iterate 0>>> 0.000 0.000 0.000 0.000 0.000 0.000 0.000
Check>>> Not Subm Not Subm Not Subm Not Subm Not Subm Not Subm Not Subm
557.33 557.55 557.66 557.85 558.01 557.86 557.91
New Distribution Gates
Module FPR Free Surface Rectangular Port
Invert El= 553.25 ft Q(mgd)= 1.75 3.82 4.92 7.31 9.45 7.38 8.02
Width= 3 ft Backwater(ft)= 4.08 4.30 4.41 4.60 4.76 4.61 4.66
Length= 6 in Yc(ft)= 0.29 0.49 0.58 0.76 0.90 0.77 0.81
No.Suppressed Contr= 0(0-3) Act.Depth(ft)= 4.08 4.30 4.41 4.60 4.76 4.61 4.66
UP= 0.04 0.04 0.04 0.04 0 04 0.04 0.04
Cd= 0.63 0.62 0.62 0.62 0 62 0.62 0.62
V(fps)= 0.22 0.46 0.58 0.82 1.02 0.83 0.89
HL(ft)= 0.00 0.01 0.01 0.03 0.04 0.03 0.03
EGL=HGL 557.33 557.56 557.67 557.88 558.06 557.89 557.94
TOP OF WALL EL 560.00 Freeboard to TOW(in). 32 29 28 25 23 25 25
FAO Basins
Parallel Path No.1-FAO Basins 1&2(Not Linked)
Piping from FAO Basins 1&2 to ML Distribution Box-Section from tee on.
Module PIPH Piping by Hazen-Williams Equation
No basins contributing= 3i 2 2 - 2 2
Diameter= 30 in Q(mgd)_ . 17.25 21.00 . 12.86 17-14
Length= 38.3 ft V(fps)= 1.30 2.84 2.70 5.44 6 62 4.05 5.41
Hazen&Will.C= 100 He(ft). 0.03 0.13 0.11 0.46 0 68 0.26 0.45
Minor Loss K's. Entr/Exit 1 Hf(ft)= 0.01 0.05 0.05 0 18 0.26 0.11 0 18
90 Bends Hm(ft)= 0.07 0.31 0.28 1.15 1 70 0.64 1.13
Branch Tee 1.5 HL(ft)= 0.08 0.37 0.33 1 33 1 96 0.74 1.31
Sum K= 2.5
HGL 557.41 557.93 558.00 559.21 560.02 558.63 559.25
Piping from FAO Basins 1&2 to ML Distribution Box-Section from tee to tee.
Module PIPH Piping by Hazen-Williams Equation
No.basins contributing=
Diameter= 24 in Q(mgd)=AiliLiiiiiiiii L.
Length= 101.3 ft V(fps)= 0.79 1.73 1.65 3.32 4.04 2.47 3.30
Hazen&Will.G= 100 He(ft)= 0.01 0.05 0.04 0.17 0.25 0.09 0.17
Minor Loss K's' Entr/Exit Hf(ft)= 0.02 0.07 0.07 0.25 0.36 0.14 0.25
90 Bends 0.3 Hm(ft)= 0.02 0.08 0.08 0.31 0.46 0.17 0.30
Branch Tee 1.5 HL(ft)= 0.04 0.16 0.14 0.56 0.81 0.32 0.55
Sum K= 1.8
HGL 557.44 558.09 558.15 559.77 560.83 558.95 559.80
Piping from FAO Basins 1&2 to ML Distribution Box-Section from basin to tee.
Module PIPH Piping by Hazen-Williams Equation
No.basins contributing=
Diameter in Q(mgd)=
Length= :II ft V(fps)= 2.03 4.43 4.22 8.50 10.35 6.33 8.45
Hazen&Will.C °' Hy(ft)= 0.06 0.31 0.28 1.12 1.66 0.62 1.11
Minor Loss K's. 7.. Hf(ft)= 0.04 0.16 0.15 0.54 0.78 0.31 0.53
Hm(ft)= 0.05 0.24 0.22 0.90 1.33 0.50 0.89
` , HL(ft)= 0.09 0.41 0.37 1.44 2.11 0.81 1.42
Sum K= 0.8
•
HGL 557.53 558.49 558.52 561.21 562.94 559.76 561.22
Parallel Path No.2-FAO Basins 5&6
Piping from FAO Basins 5&6 to ML Distribution Box ,
Module PIPH Piping by Hazen-Williams Equation
No.basins contributing=
Diameter= 30 in Q(mgd)=)Length= 239.8 ft V(fps)= 1.30 2.84 2.70 5.44 6.62 4.05 5.41
Hazen&Will.C= 100 Ho(ft)= 0.03 0.13 0.11 0.46 0.68 0.26 0.45
Minor Loss K's Entr/Exit 1.5 Hf(ft)= 0.08 0.34 0.31 1.14 1.63 0.66 1.12
Tee Bends 4.5 Hm(ft)= 0.18 0.88 0.79 3.22 4.77 1.79 3.18

Valve 1 HL IftS= 026 i.22 1 ii 435 640 245 430
Sum K= 7
HGL 557.59 558.77 558.76 562.21 564.41 560.30 562.21
Governing HGL 557.59 558.77 558.76 562.21 564.41 560.30 562.21
Aeration Tanks
Effluent Channel Effluent Port (BASED ON TANKS 5&6/TANKS 1&2 AT DIFFERENT ELEVATIONS)
Module FPR Free Surface Rectangular Port
Invert El= ft Q(mgd)= Ali.
Width= ft Backwater(ft)= -4.41 -3.23 -3.24 0.21 2.41 -1.70 0.21
Length= in Yc(ft)= 0.33 0.55 , 0.53 0.85 0.97 0.70 0.85
No.Suppressed Cony= (0-3) Act.Depth(ft)= 0.33 0.55 0.53 0.85 2.41 0.70 0.85
UP= 0.27 0.24 0.25 0.21 0.13 0.23 0.21
Cd= 0.78 0.76 0.76 0.74 0.69 0.75 0.74
V(fps). 3.24 4.21 4.14 5.23 2.24 4.74 5.22
HL(ft)= 0.27 0.48 0.46 0.77 0.16 0.62 0.77
EGL- 582.60 563.03 563.00 563.63 564.58 563.32 563.62

• Effluent Channel (BASED ON TANKS 5&6/TANKS 1&2 AT DIFFERENT ELEVATIONS)
Module OCR Short Rectangular Open Channel
Invert El= 0(mgd)= 2.06 4.50 4 29 8.63 10.50 6.43 8.57
Width= .i'i ft Backwater(ft)= 0.60 1.03 1.00 1.63 2.58 1 32 162
Length= ,,=:48.00 ft Yc(ft). 0.33 0.55 0 53 0 85 0.97 0 70 0 85
• Manning n= 0.015 Yn(ft).
Slope= c 0.0000 ft/ft Iterate 0>>> N/A N/A N/A N/A N/A N/A NA
K-ent= 0.50 Area(sf)= 0.00 0.00 0.00 0.00 0.00 0.00 0 00
Downstream Conditions Actual Depth(ft)= 0.60 1.03 1.00 1 63 2.58 1.32 1.62
Area(sf)= 1.80 3.09 2.99 4 88 7.73 3.97 4.85
V(fps). 1.77 2.25 2.22 2 74 2.10 2.51 2.73
Sf(ft/ft). 0.0010 0.0010 0.0010 0.001 1 0.0005 0.0010 0.0011
Upstream Conditions Upstrm Depth(ft)=_ 0.57 0.' 1.38 1.67
Iterate 0»> 69.62 101.39 0.00 82.77 0.00 0 00 0.00
Check»> Solve Sol, ok
Area(sf)= 1.72 2.88 3.14 4.74 7.80 4.13 5.02
V(fps)= 1.86 2.42 2.11 2.82 2.08 2.41 2.64
Sf(ft/ft)= 0.0011 0.0012 0.0009 0.0011 0.0005 0.0009 0.0010
Hm(ft)= 0.03 0.05 0.03 0.06 0.03 0.05 0.05
EGL=HGL 562.65 563.10 563.15 563.76 564.70 563.51 563.84
Freeboard to Effluent Weir(in)= 37 32 31 24 13 27 23
Effluent Weir (BASED ON TANKS 5&6/TANKS 1&2 AT DIFFERENT ELEVATIONS)
Module WS Sharp Crested Weir
• Tank Invert El= 552.50
Weir Wall Concrete El= 565.50
Weir Plate Setting over Wall= 3.00 in Q(mgd)=_ 2.06 4.50 4.29 8.63 10.50 6.43 8.57
Weir Elev= 565.75 ft Nominal H.(ft). 0.12 0.21 0.20 0 32 0.37 0.27 0 32
Length= 22.00 ft Effective Weir Length= 21.98 21.96 21.96 21 94 21.93 21.95 21 94
C,,,= 3.3 H„(ft)= 0.12 0.21 0.20 0.32 0.37 0.27 0.32
No.of End Contractions= 2 Weir Submergence(Hz)= 0.00 0.00 0.00 0.00 0.00 0.00 0.00
<If Subm> H,(ft)= 0.00 0.00 0.00 0.00 0.00 0.00 0.00
<If Subm>Iterate 0»> 0.000 0.000 0.000 0.000 0.000 0.000 0 000
Check>>> Ncr' Not Subm Ni- Not Subm Not Subm Not Subm
EGL=HGL 565.87 565.96 565.95 566.07 566.12 566.02 566.07
Water Depth(ft)= 13.37 13.46 13.45 13.57 13.62 13.52 13.57
Anoxic Zone Weir (BASED ON TANKS 5&6/TANKS 1&2 AT DIFFERENT ELEVATIONS)
Module WS Sharp Crested Weir
Weir Elev= 565.75 ft
Length= 50.00 ft Q(mgd)_ 11.43 16.13 18.00 13.57 15.71
C„,= 3.3 Nominal H,.(ft)= 0.20 0.23 0.23 0.28 0.31 0 25 0.28
No.of End Contractions 2 Effective Weir Length= 49.96 49.95 49.95 49.94 49.94 49.95 49.94
H,,,(ft). 0.23 0.29 0.29 0 38 0.44 0.34 0.39
Weir Submergence(Hz)= 0.12 0.21 0.20 0.32 0.37 0.27 0.32
<If Subm> H,(ft)= 0.23 0.29 0.29 0.38 0.44 0.34 0.39'
<If Subm>Iterate 0>>> 0.000 0.000 0 Om 0 022 0 000 0.000 0 000
Check»> ok ok - -
EGL=HGL. '565.98 566.04 566.04 566.13 566.19 566.09 566.14
Anoxic Zone-Submerged Gate Calc-Normally CLOSED-Size for Zero Headloss,if open when both zones aerated(also For Draining)
P
Module BWPP Baffle Wall with Free Surface Ports and Submerged Ports
Total Flow through Baffle Wall(mgd)= 9.56 12.00 11 43 16.13 18.00 13.57 15.71
Free Surface Ports
No.Ports= 1 Free Port Flow(mgd)= 8.03 10.78 10.23 14.26 16.91 12.46 14.63
Invert El= 565.75 <Iterate 0> 0.000 0.000 0.000 0.157 _ 0.000 0.000 0.000
Width= 50 ft Check>>>
Length of Port= 12 in Backwater(ft)= 0.12 0.21 0.20 0 32 0.37 0.27 0 32
No.Suppressed Cont= 2(0-3) Yc(ft)= 0.12 0.15 0.15 0.18 0.20 0.17 0.19
Act.Depth(ft). 0.12 0.21 0.20 0.32 0.37 0.27 0.32
L/P(See B&K)= 0.02 0.02 0.02 0.02 0.02 0.02 0.02
Submerged Rectangular Ports Cd= 0.63 0.63 0.63 0.63 0.63 0.63 0.63
No.Ports= 1 V(fps)= 1.99 1.59 1.56 1.36 1.42 1.45 1.40
Heighth = 1 ft HL(ft)= 0.155 0.099 0.095 0.072 0.078 0.082 0.077
Width = 1 ft HGL Upstream(ft)= 566.03 566.06 566.05 566.15 566.20 566.10 566.15
Length of Port= 12 in
No Suppressed Cont= 1(0-3)
LIP(See B&K)= 0.250 Subm Port Flow(mgd)= 1.54 1.22 1.20 1 87 1 09 1.12 1.08

Anaerobic Zone-Existing Gate(See Detail 6/M7 of December 2005 Plans) (BASED ON TANKS 5&6/TANKS 1&2 AT DIFFERENT ELEVATIONS)
Module BWPP Baffle Wall with Free Surface Ports and Submerged Ports
Total Flow through Baffle Wall(mgd)=� x„ '-21iiiliti, AL ,
Free Surface Ports
No.Ports #`. 1 Free Port Flow(mgd)= 0.78 ', 1.'7i 1.62 3.05' "4.12 . '2.48 .91""�'`f
Invert El 42 <Iterate 0> 0 000 0 000 0 000 0 008 0 000 0 000 0.000
Width `2 ft Check»> .:,, ok
Length of Port= t. 12 in . Backwater(ft)= 2.56 2.62 2.62 2.71 2.77 2.67 2.72
r
No.Suppressed Cont= 1(0-3) Yc(ft)= 0.23 0 38 0 37 0 56 0 68 0 49 0.59
Act.Depth(ft)= 2.56 2.62 2.62 2.71 2.77 2.67 2.72
UP(See B B K)= 0.14 0.14 0.14 0.13 0.13 0 14 0.13
Submeraed Rectanaular Ports Cd= 0.69 0.69 0.69 0.69 0.69 0.69 0.69
No.Ports= 1 V(fps)= 0.24 0.50 0.48 0.87 1.15 0.72 0.94
Heighth = 3 ft HL(ft)= 0.002 0.008 0.008 0.025 0.044 0.017 0.029
Width i. ft HGL Upstream(ft)= 565.98 566.05 566.04 566.15 566.24 566.11 566.17
Length of Port= k, in
No.Suppressed Cont= 2 1(0-3)
L/P(See B&K)= 0-083 Subm Port Flow(mgd)= 1.28 2.79 2.66 5.58 6.38 3.95 5.25
Cd= 0.66 V(fps)= 0.22 0.48 0.46 0.96 1.10 0.68 0.90
HL(ft)= 0.002 0 008 0 008 0.033 0.043 0.017 0.029
EGL•HGL 565.98 566.05 566.04 566.16 566.24 566.11 566.17
Anaerobic Zone-Baffle .,ASLU ON TANKS S&6 I ASKS 1&2 Ai Lill LI7LN I Lai JAI IONS)
Module FPR Free Surface Rectangular Port
Invert El= 552.42 ft
Width= 3 ft Backwater(ft)= 13.56 13.63 13.62 13.74 13.82 13.69 13.75
Length= 12 in Yc(ft). 0.33 0.55 0.53 0.85 0.97 0 70 0.85
No.Suppressed Contr= 2(0-3) Act.Depth(ft)= 13.56 13.63 13.62 13.74 13.82 13.69 13.75
L/P= 0.03 0.03 0.03 0.03 0.03 0.03 0.03
Cd= 0.64 0.64 0.64 0.64 0.64 0.64 0.64
V(fps)= 0.08 0.17 0.16 0.32 0.39 0.24 0.32
HL(ft)= 0.00 0.00 0.00 0.00 0.01 0 00 0.00
EGL-HGL 565.98 566.05 566.04 566.17 566.24 566.11 566.18
Inlet Channel i6A5eD TiN TANKS 5&6/TANKS 1&2 AT DIFFERENT ELEVATIONS)
Module OCR Short Rectangular Open Channel
Invert El= i 563.67 O(mgd)= - 8.63 10.50 6.43 8.57
Width= 3.00 ft Backwater(ft)= 2.31 2.38 2.37 2.50 2 57 2 44 2 51
Length= c. 5.00 ft Yc(ft). 0.33 0-55 0 53 0.85 0 97 0 70 0 85
Manning n= 0.015 Yn(ft)_IMML;
Slope= 0.0000 ft/ft Iterate 0 as> N/A N/A N/A N/A N/A N/A N/A
K-ent= 0.50 Area(sf)= 0.00 0.00 0.00 0.00 0 00 0.00 0.00
Downstream Conditions Actual Depth(ft). 2.31 2.38 2.37 2 50 2 57 2.44 2.51
Area(sf)= 6.93 7.15 7.12 7 49 7 71 7.32 7.52
V(fps)= 0.46 0.97 0.93 1 78 2 11 1.36 1.76
Sf(ft/ft)= 0.0000 0.0001 0.0001 0 0004 0 0005 0.0002 0.0003
Upstream Conditions Upslrm Depth(ft)=IMMIIIIMMi 2 49 2 57 2.44 2.51
Iterate 0>>> 0.000 0.000 0.000 25.141 0.000 0.000 0.000
Check»> ok ok ok Si. us ok ,,.
Area(sf)= 6.93 7.15 7.12 7.47 7.72 7.32 7.53
V(fps)= 0.46 0.97 0.93 1.79 2.10 1.36 1 76
Sf(ft/ft)= 0.0000 0.0001 0.0001 0 0004 0.0005 0.0002 0.0003
Hm(ft)= 0.00 0.01 001 002 003 0.01 0.02
EGL 565.99 566.08 566.06 566.23 566.35 566.15 566.25
. 20 $ I
ATI Piping
Module PIP( Piping by Hazen-Williams Equation
Diameter= 24 in Q(mgd)_ .06 ( 4 50 1 4.29 8.63 6.43 8.57
[FUTURE AT#7]Length= 500 ft V(fps)= 1.02 2.22 2.11 4.25 5.17 3.17 4.22
Hazen&Will.C= 120 Ha(ft)= 0.02 0.08 0.07 0.28 0.42 0.16 0.28
Minor Loss K's Entr/Exit 1.5 Hf(ft)= 0.10 0.42 0.38 1.39 2.00 0.81 1 37
90 Bends 0.9 Hm(ft).- 0.04 0.20 0.18 0.74 1.10 0.41 0 73
Branch Tee HL(ft)= 0.14 0.62 0.56 2.13 3.10 1.22 2 11
Plug Valve
45 Bends 0.25
Sun K= 2.65

EGL•HGL 566.13 566.70 566.63 568.37 569.45 567.37 568.36
I Freeboard to Distribution Weir(in)= 28 22 22 2 -11 14 2

IAT Temporary Discharge CL(Temporary Conditions During Construction)
Top of Wall Elevation= 567.58 567.58 567.58 567.58 567.58
Temporary Pipe Centerline Elevation= 564.83 564.83 564.83 564.83 564.83
ATI Piping to Aeration Tank No.1(Temporary Conditions During Construction)
Module PIPI Piping by Hazen-Williams Equation
Diameter= 24 in 0(mgd)= 2.06 4 50 4.29 8.63
Length= 180 It V(fps)= 1.02 2.22 2 11 4.25
Hazen&Will.C= 140 Hv(ft)= 0.02 0.08 0.07 0.28
Minor Loss K's• Entr I Exit 0.5 Hf(ft)= 0.03 0.11 0.10 0.38
90 Bends 0.9 Hm(ft)= 0.05 0.22 0.20 0.80
Branch Tee 1.2 HL(ft)= 0.07 0.33 0.30 1.18
Plug Valve
45 Bends 0.25
Sum K= 2.85
EGL=HGL 566.06 566.41 566.36 567.41
Temporary ATI Piping into Aeration Tank No.1(Temporary Conditions During Construction)
Module PIPI Piping by Hazen-Williams Equation
Diameter= 18 in 0(mgd)= 2.06 4.50 4.29 8.63
Length= 20 ft V(fps)= 1.81 3.94 3.75 7.55
Hazen&Will.C= 140 Hv(ft)= 0.05 0.24 0.22 0.89
Minor Loss K's• Entr/Exit 1.0 Hf(ft)= 0.01 0.05 0.05 0.17
90 Bends 0.3 Hm(ft)= 0.07 0.31 0.28 1.15
HL(ft)= 0.08 0.36 0.33 1.32
Sum K= 1.3
EGL=HGL 566.14 566.77 566.70 568.73
Freeboard to Distribution Weir(in)= 28 21 22 -3

Aeration Tank Distribution Structure
Distribution Weir
Module WS Sharp Crested Weir
0(mgd)_'• 2.06 4.50 4.29 8.63 10.50 6.43 8.57
Weir Elev= 568.50 ft Nominal Hw.(ft)=. 0.39 0.65 0.63 1 01 1 15 0 83 1 00
Length= 4 ft Effective Weir Length= 3.92 3.87 3 87 3 80 3 77 3 83 3 80
C„,= 3.3 Hw,(ft)= 0.39 0.67 0.65 1.04 1.45 0.85 1.04
No.of End Contractions= 2 Weir Submergence(Hz)= 0.00 0.00 0.00 0.00 0.95 0.00 0.00
<If Subm> Hi(ft)_i"" 1.45
<If Subm>Iterate 0>>> 0.000 0 000 0.000 0 000 0 000 0 000 0 000
Check>>> Not Subm Not Subm Not Subm Not Subm ok Not Subm Not Subm
568.89 569.17 569.15 569.54 569.95 569.35 569.54
Distribution Weir Approach Channel
Module OCR Short Rectangular Open Channel
Invert El= 565.75 Q(mgd)= 2 06 4 50 4.29 8.63 10.50 6.43 8 57
Width= ` 6.00 ft Backwater(ft)= 3.14 3.42 3.40 3.79 4.20 3.60 3.79
Length= . 6.00 ft Yc(ft)= 0.21 0.35 0.34 0.54 0 61 0 44 0 53
Manning n= /• 0.015 Yn(ft)_ .w'...r'
Slope= 0.0000 ft/ft Iterate 0»> N/A N/A _ N/A N/A N/A N/A N/A
K-ent= '� 0.50 Area(sf)= 0.00 0.00 0 00 0 00 0.00 0.00 0.00
Downstream Conditions Actual Depth(ft)= 3 14 3.42 3 40 3.79 4.20 3 60 3.79 '
Area(sf)= 18.86 20.50 20.37 22.76 25.19 21.61 22.73
V(fps)= 0.17 0.34 0.33 0.59 0.64 0.46 0.58
Sf(ft/ft)= 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Upstream Conditions Upstrm Depth(ft)=11. 11111111r 3.40 3.73 IN1. 3.60 3.79 1
Iterate 0»> 0.000 0.000 0.000 3515.266 35537.929 0.000 0.000
Check»> ok ok ok
Area(sf)= 18.86 20.50 20.37 22.38 16.50 21.61 22.73
V(fps). 0.17 0.34 0.33 0.60 0.98 0.46 0.58
Sf(ft/fl)= 0.0000 0.0000 0.0000 0.0000 0.0001 0.0000 0.0000
Hm(ft)= 0.00 0.00 0.00 0.00 0.01 0.00 0.00
EGL HGL 568.89 569.17 569.15 569.49 568.52 569.36 569.55
Distribution Channel
Module OCR Short Rectangular Open Channel
0(mgd)= 4.13 9.00 8.57 17.25 21.00 12.86 17.14
Invert El 558.49 Backwater(ft)= 10.40 10.68 10.66 11.00 10.03 10.87 11.06
Width= 6.50 ft Yc(ftl= 0.31 0.52 0.51 0.81 0.92 0.66 0.80
Length= 16.00 ft Yn(ft)_ ,4w
Manning n= 0.015 Iterate 0»> NIA NIA NIA N/A N/A N/A N/A
Slope= 0.0000 ft/ft Area(sf)= 0.00 0.00 0.00 0.00 0.00 0 00 0.00
K-ent= 0.50
Downstream Conditions Actual Depth(ft). 10.40 10.68 10.66 11.00 10.03 10.87 11.06
Area(sf)= 67.62 69.42 69.28 71 48 65.21 70.63 71.86
V(fps)= 0 0 9 0.20 0.19 0.37 0.50 0.28 0.37
(
St(ft/ft)= 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Upstream Conditions
Iterate 0»> 0.00 0.00 0.00 333.40 0 00 0.00 0.00
Check>>> ok ok Solve ok ok ok
Area(sf)= 67.62 69.42 69.28 71.48 65.21 70.63 71.86
V(fps)= 0.09 0.20 0.19 0.37 0.50 0.28 0.37
Sf(1Vfl)= 0.0000 0.0000 0 0000 0.0000 0.0000 0.0000 0.0000
Hm(ft)= 0.00 0.00 0 00 0.00 0.00 0.00 "0.00 '
EGL=HGL 568.89 569.17 569.15 569.49 568.53 569.36 569.55
-
Mixed Liquor Distribution Inlet Drop Box
Module CCR Rectangular Closed Conduit by Mannings Equation
Width 6.5 ft Q(mgd)_ 8.3 18.0 15.0 17.3 31.5 22.5 30.0
Height= ti 7 ft V(fps). 0.28 0.61 0.51 0 59 1 07 0 77 1 02
Length - 8.5 ft Hv(ft)= 0.00 0.01 0.00 0.01 0 02 0 01 0.02
Manning n= 0.015 Hf(ft). 0.00 0 00 0.00 0.00 0.00 0.00 0.00
SumK= 0.5 Hm(ft)= 0.00 0 00 0.00 0.00 0 01 0.00 0.01
HL(ft)= 0.00 0.00 0.00 0.00 0.01 0.00 0.01

568.89 569.17 569.15 569.49 568.54 569.36 569.56
Grit Effluent/RAS Blend Piping[Two Parallel Pipes]
Module PIPE Pipin]by Hazen-Williams Equation
Number of Pipes in Service= i. :,
Diameter= 36 in (3(mgd)= 8.25 "'18.00 15.00 17.25 ' 31.50 22.50 30.00
Length= 120 ft V(fps)= 1.81 3.94 3.28 3.78 6.90 4.93 6.57
Hazen&Will.C= 120 Hv(ft)= 0.05 0.24 0.17 0.22 0 74 0.38 0.67
Minor Loss K's. Entr I Exit 1.5 Hf(ft)= 0.04 0.18 0.13 0.17 0.51 0.27 0.46
90 Bends 0.3 Hm(ft)= 0.09 0.43 0.30 0.40 1 33 0.68 1.21
HL(ft)= 0.13 0.61 0.43 0.57 1.84 0.95 1.67
Swn K= 1.8
EGL=HGL 569.03 569.79 500.59 570.06 570.30 570.31 571.23

Grit Removal Facility
Grit Effluent Drop Box ,
Module CCR Rectangular Closed Conduit by Mannings Equation
Width= 6 ft a(mgd)= i _
Height= ' '. 5.2 ft V(fps). 0.41 0.89 0.74 0 86 1.56 1.12 1.49
Length= 21.2 ft Hv(ft). 0.00 0.01 0.01 0.01 0.04 0.02 0.03
Manning n= ' 0.015 Hf(ft)= 0.00 0.00 0.00 0 00 0.00 0.00 0.00
SumK=':':o,.. 0.5 Hm(ft)= 0.00 0.01 .0.00 0.01 0.02 0.01 0.02
HL(ft). 0.00 0.01 0.01 0.01 0.02 0.01 0.02
EGL=HGL 569.03 569.80 569.59 570.06 570.40 570.33 571.25
Freeboard to Parshall Flume(in)= 18 8 it 5 1 2 -9
Total Flow 5.50 9.00 15.00 22.50 22.50 30.00 45.00
Flow through Bypass 1.00 1.50 0.00 3.75 3.75 11.50 20.00
Flow through Grit Tanks 4.50 7.50 15.00 18.75 18.75 18.50 25.00
Head through Bypass 572.90 573.19 572.00 572.95 572.95 573.87 574.66
Head through Grit Tanks 571.96 572.54 572.31 572.88 574.36 573.40 574.36
Difference in Head 0.94 0.65 N/A 0.07 -1.41 0.47 0.30
Influent Parshall Flume-Influent Flow Measurement at Grit
Module FLP Parshall Flume
Q(mgd)= 55 22.5 15.0 22.5
Crest El= 570.50 ft Ha(ft)= 1.04 1.43 1.27 1 65 2 58 1.99 2.58
Throat Width(ft)= 2 ft Submergence(ft). 0.00 0 00 0 00 0.00 0.00 0.00 0 75
Capacity(mgd)= 21.4 mgd Submergence(%)= 0% 0% 0% 0% 0% 0% 29%
Width at Mth(ft)= 4 ft Va(fps)= 2.45 2.92 2.74 3.16 4.04 3.50 4.04
k ent=I
0.5 EGLa(ft)= 571.63 572.06 571.89 572.31 573.34 572.68 573.34
H at Mouth(ft). 1.31 1.71 2.68 2.06 2.68
Iterate 0»> 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Check»> ok nk ok ok ok ok
V at Mouth(fps). 1.98 2 35 2.21 2.55 3.25 2.82 3 25
Entrance Loss(ft)= 0.03 0 04 0 04 0 05 0 08 0 06 0 08
EGL=1-IGL 571.66 572.11 571.93 572.36 573.42 572.74 573.42
Grit Removal Unit-Effluent Channel-Smith&Loveless PISTA Grit
Module OCR Short Rectangular Open Channel
Q(mgd)= 5.5 9.0 7.5 11.3 22.5 15.0 22.5
Invert El 570.50 Backwater(ft)= 1.16 1.61 1.43 1 86 2 92 2 24 2 92
Width= 4.00 ft Yc(ft)= 0.52 0.72 0-64 0L84 1 33 1 0'. 33
Length= 10.00 ft Yn(ft)=
Manning n= 0.015 Iterate 0»> N/A N/A N/A N/A N/A NIA NIA
Slope= 0.0000 ft/ft Area(sf)= 0.00 0.00 0.00 0.00 0 O0 0 00 0 00
K-ent= 0.50
Downstream Conditions Actual Depth(ft)= 1.16 1.61 1.43 1 86 2.92 2.24 2.92
Area(sf)= 4.66 6.42 5.70 7 43 11.67 8.96 11.67
V(fps)= 1.83 2 17 2.03 2 34 2.98 2.59 2.98
Sf(ft/ft)= 0.0005 0.0006 0.0005 0.0006 0.0007 0 0006 0.0007
Upstream Conditions Upstrm Depth(ft)= 1.17 1.61 T4.3 1.86 2.93 2.25 2.93
Iterate 0»> 0.000 -0.001 0 000 0 000 0 000 0 000 0 000
Check»> ok ok
Area(sf)= 4.68 6.45 5.73 7.45 11.71 8.99 11.71
V(fps)= 1.82 2.16 2.03 2.34 2.97 2.58 2 97
Sf(ft/1)= 0.0005 0.0006 0.0005 0.0006 0.0007 0.0006 0 0007
Hm(ft)= 0.03 0.04 0.03 0.04 0.07 0.05 0 07
EGL=HGL 571.75 572.22 572.03 572.49 573.63 572.90 573.63
Grit Removal Unit-Smith&Loveless PISTA Grit
Module MFR Manufacturer Head Loss Info
Reference Q= 20 mgd Q(mgd)= 5.5 9.0 7.5 11.3 22.5 15.0 22.5
Reference HL= 0.021 ft HL(ft)= 0-00 0 00 0 00 0 01 0 03 0 01 (t 03
EGL=HGL 571.75 572.22 572.03 572.50 573.66 572.91 573.66
Sloped Channel into Grit Removal Unit
Module CCR Rectangular Closed Conduit by Mannings Equation

Width= ft Q(mgd)_ +° 1 ' ,,;4:7 , t t '; 3-£�c ,}.... .�,.. 't? . .'
Height= ft V(fps)= 0.85 1.39 1.16 1.74 3.48 2.32 3.48
Length= ft Hv(ft)= 0.01 0.03 0.02 0.05 0.19 0.08 0.19
Manning n= Hf(ft)= 0.00 0.00 0.00 0.00 0.02 0.01 0.02
SumK= Hm(ft)= 0.01 0.02 0.02 0.04 0.14 0.06 0.14
HL(ft)= 0.01 0.03 0.02 0.04 0.16 0.07 0.16
571.76 572.25 572.05 572.54 573.82 572.98 573.82

Grit Removal Unit-Approach Channel-Smith$Loveless PISTA Grit
Module OCR Short Rectangular Open Channel
Q(mgd)=j- 5.5 9.0 7.5 11.3 22.5 15.0 22.5
Invert El 570.50 Backwater(ft)= 1.26 1.75 1.55 2.04 3.32 2.48 3.32
Width= - 4.00 ft Yc(ft)= 0.52 0.72 0.64 0.84 1.33 1.01 1 33
Length= , 10.00 ft Yn(ft). 0.13 0.18 0.18 0.21 0.21 0.29 0.37
Manning n= k 0.015 Iterate 0>>> N/A N/A N/A N/A N/A N/A N/A
Slope= ' 0.0000 ft/ft Area(sT)= 0.54 0.74 0.74 0.85 0 85 1 14 1 48
K-ent=k 0.50
Downstream Conditions Actual Depth(ft)= 1 26 1 75 1 55 2.04 3 32 2.48 3.32
Area(sf)= 5.03 7 00 6.19 8.14 13 26 9 94 13.26
V(fps)= 1.69 1 99 1.87 2.14 2 62 2 34 2.62
• Sf(ft/ft)= 0.0004 0.0004 0.0004 0.0005 0 0005 0 0005 0.0005
Upstream Conditions Upstrm Depth(ft)= 1.26
Iterate 0»> 0 000 0.000 0.000 0.000 0 000 0 000 0 000
Check»> ok ok .= ok ol.
Area(sf)= 5.05 7.02 6.21 8.16 13.29 9.96 13.29
V(fps)= 1.69 1.98 1.87 2.13 2.62 2.33 2.62
Sf(ft/ft)= 0.0004 0.0004 0.0004 0.0005 0.0005 0.0005 0.0005
Hm(ft)= 0.02 0.03 0.03 0.04 0.05 0.04 0.05
EGL=HGL 571.83 572.35 572.13 572.65 573.98 573.12 573.98
Grit Removal Unit-Approach Channel-Influent Gate
Module FPR Free Surface Rectangular Port
Invert El= 570.50 ft Q(mgd)= 5.5 9.0 7.5 11.3 22.5 15.0 22.5
Width= 3.0 ft Backwater(ft)= 1.33 1.85 1.63 2.15 3.48 2.62 3.48
Length= 12 in Yc(ft). 0.63 0.87 0.77 1 01 1 61 1 23 1 61
No.Suppressed Contr= 2(0-3) Act.Depth(ft)= 1.33 1.85 1.63 2.15 3.48 2.62 3.48
UP= 0.18 0.15 0.16 0.14 0.10 0.12 0.10
Ca= 0.72 0.70 0.71 0.70 0.68 0.69 0.68
V(fps)= 2.13 2.51 2.37 2.70 3.33 2.96 3.33
HL(ft)= 0.14 0.20 0.17 0.23 0.38 0.29 0.38
EGL•HGL 571.96 t 572.54 572.31 572.88 574.36 573.40 574.36
Bypass Channel This Module is Not Linked
Module OCR Short Rectangular Open Channel
Q(mgd)= 1.0 1.5 0.0 3.8 3.8 11.5 20.0
Invert El= 572.00 Backwater(ft)= -2.97 -2.20 -2.41 -1.94 -1.60 -1.67 -0.75
Width= 3.00 ft Yc(ft)=_ 0.20 0.27 0.00 0.49 0.49 1.03 1.49
Length= 46.00 ft Yn(ft)_p.
Manning n= 0.015 Iterate 0>>> N/A N/A N/A N/A N/A N/A N/A
Slope= 0.0000 ft!ft Area(sf)= 0.00 0.00 0.00 0.00 0.00 0.00 0 00
Kent= 0.50
•
Downstream Conditions Actual Depth(ft)= 0.20 0 27 0.00 0.49 0 49 1.03 1 49
Area(sf)= 0.61 0.80 0.00 1.46 1.46 3.09 4.47
V(fps)= 2.55 2.92 #DIV/01 3.96 3.96 5.76 6.93
Sf(ft/ft)= 0.0066 0.0063 #DIV/01 0.0060 0.0060 0 0065 0 0072
Upstream Conditions Upstrm Depth(ft)= 0.90 1.18 2.00 0.81 0.81 1.51 2.09
Iterate 0>>>. -133.733 -201.759 #DIV/01 0.000 0 000 0 000 0 000
Check" Solve Solve #DIV/07
Area(sf)= 2.69 3.55 6.00 2.44 2 44 4 52 6 27
V(fps)= 0.58 0.65 0.00 2.37 . 3 Al a 93
Sf(ft/ft)= 0.0001 0.0001 0.0000 0.0013 0 0013 0 0023 0 0030
Hm(ft). 0.00 0 00 0.00 0.04 0 04 0.12 0 19
EGL w HGL' 572.90 573.19 572.00 572.95 572.95 573.87 574.66
Grit Removal Unit-Distribution Channel
Module OCR Short Rectangular Open Channel
0(mgd)= 5.5 9.0 15.0 22.5 22.5 30.0 45.0
Invert El= 571.00 Backwater(ft)= 0.96 1.54 1.31 1.88 3.36 2.40 3 36
Width= 6.00 ft Yc(ft)= 0.40 0.55 0.77 1.01 1 01 1 23 '61
Length= 5.00 ft Yn(ft).
Manning n= 0.015 Iterate 0»> N/A N/A N/A N/A N.A N)A N,A
Slope= 0.0000 ft/ft Area(sf)= 0.00 0.00 0.00 0 00 0 00 0.0D 0 00
Kent= 0.50

Downstream Conditions Actual Depth(ft)= 0.96 1.54 1 31 1.88 3 36 2.40 3.36
Area(sf)= 5.79 9.26 7.83 11.28 20.15 14.41 20.15
V(fps)= 1.47 1.50 2.96 3.09 1.73 3.22 3.46
Sf(fttft)= 0.0003 0.0002 0.0010 0.0008 0.0002 0.0007 0.0007
Upstream Conditions Upstrm Depth(ft)= 0.97 1.54 1.31 1.88 3.36 2.41 3.36
Iterate 0>>> 0.000 0.000 0.000 0.000 0.000 0.000 0.000
Check»> _ ok ok ok ok ok ok
Area(sf)= 5.80 9.27 7.87 11.31 20.15 14.44 20.17
V(fps)= 1.47 1.50 2.95 3.08 1.73 3.22 3.45
Sf(ft/ft)= 0.0003 0.0002 0.0010 0.0008 0.0002 0.0007 0.0007
Hm(ft). 0.02 0.02 0.07 0.07 0 02 0.08 0.09
572.02 572.60 572.51 573.11 574.43 573.65 574.64

02 - PROCESS FLOW SCHEMATIC
Union County FORM ATC-12-14
Twelve Mile Creek WRF Expansion Attachment for Section 3.H
NPDES No.NC0085359

r
TRIBUTARY
OM SDI MLE
iiulpu PM MiFLUENT PUMP
STATION a
11 aMw°>; sill. km i
�Ali
1zuN a EPs FMorvER9oN • N
PNP
11 STATOR
1.x JUNcryION b• •MH• M Mi. srrsma
w g
-
3Y ■ ��� gi" IrFM
u 4G
S M '���1 NN rsFM ® Ir FTM
SCREENING �� �TAMI
7 A00.RY AERATION
�r • BUR GE wAcxc FR BLOWER
SMAA�A cY_ rb0 MI BILGNG
Y ..FLUENT PUMP
.•
STATION RA MBA3K.. irBQN I
rP°0 AER/�110NT®8wee 4 AERATION T®S • Y PS C
1 • a_ ro r DM
— a wa°Y
�ro Y Y 1� li
Y• A•AT3ORTANNA •tEEMN.scpm4TR R• $ 'S' 8 " ❑IFUTUREI® ® = .�..J I^µ�:—
F�e�l _
•
At I"uF..w 3rr AERATON TANK • _
CLUB scull 3r S0 Ir (FUTUREI• ` \` 7---I
ULTRAVIOLET 9' — 13.-0. •i 1
O"� CASCADE DISINFECTION �MUREI Ire. — • >Y DISTRIBUTION TION ORR RENOVN
FACILITY
AERATOR .r 3r UM W _..,_ MLS6 Y fro .....3
_ B MEAGLNEMENT I .
m'lilIIIOI3 3r3rt O .roE �_= - FILTER y r M1°�® BTRIICTURE Mn Pe.
oom a. 3r L}" an'cE gOUTFAUS f CLARIFIER P AERATION TA�®] • ® Y
rPE r .1— 38TEPa 3.R c� ITrBFkg �• e / •
EF NT 3.
.7
OUTFAIL TER, , RAS w Q ""
saw.. CTUPE or PD Err
PbA , g fAaTY Q WAB PS AERATION Tw«1 •
'ssN STATION 1 g g 1 -.-d•' € -
�0 ® Al
1 tcum
ION '" PO
1
: es o i rrR eN.srssro •
rOFR
i
NAANT PUMP LIQUID FLOW SCHEMATIC..rEAAT STATION
,}F•RA"4,•oRai NOPoe .-F UNION COUNTY MTE. DECEMBER:
Y' kip Michael D. Hazen NMI
i °`�"°" L.eE""E^N w• P,N„ NORTH CAROUNA "`¢""°
PIRR.. w.MA3Mhu -c art> 8n.izls MECHANICAL F`a"""°
E. CEI'•O•• M.PARKER S1FLO .. 7:52:20.05•00• 9101sok2EN ALsAwN PINE wuEVARo TWELVE MILE CREEK WRF PROPOSED PROCESS FLOW SCHEMATIC RENx
!a N �� ••PTTO•• ••••"' ` ®Fi4AL 00AWF3G•FOR RENEW PURPOSES ONLY• ...rm.NORTH CAROM..ns» 9.0 MGD EXPANSION
!e My IR•n FOR aN 7NOT RELEASED FOR CONSTRUCTION

03 - INFLUENT AND DIVERSION PUMPS
li Union County FORM ATC-12-14
Twelve Mile Creek WRF Expansion Attachment for Section 3.H
NPDES No.NC0085359

Twelve Mile Creek Water Reclamation Facility 9.0 mgd Expansion Project
Influent and Diversion Pump Summary
The Twelve Mile Creek WRF 9.0 mgd Expansion Project includes construction of a new Influent Pump
Station (IPS) 2 which will operate in parallel to the existing IPS 1. The new IPS 2 is designed as a self-
cleaning, trench style wetwell and will accommodate four(4) large buildout pumps. However three(3)
smaller pumps will be installed initially to convey current flows,with room for another future pump.
The existing IPS 1 is divided into two(2)wetwells with two (2)pump slots included each wetwell (i.e. 4
pump slots total). This pump station is planned for rehabilitation/modification during this project,
including converting one of the wetwells into a diversion pump station. Two(2) diversion pumps will be
provided in this wetwell for conveying influent wastewater to another treatment facility. Note: The
Twelve Mile Creek WRF has an existing diversion pump station, however that facility will be replaced by
these new diversion pumps that are to be located in IPS 1.
Proposed Pump Capacities for IPS No. 1 and IPS No. 2
Pump 9.0 mgd 12.0 mgd 15.0 mgd Buildout Flow
Expansion Expansion Expansion Allowance
IPS No. 1-1 Diversion (160 hp) Diversion (160 hp) Diversion (160 hp) Diversion (160 hp)
IPS No. 1-2 Diversion (160 hp) Diversion (160 hp) Diversion (160 hp) Diversion (160 hp)
IPS No. 1-3 6.2 mgd (215 hp)(2) 5.6 mgd (215 hp)(2) 5.0 mgd (215 hp)(2) 4.0 mgd (215 hp)(2)
IPS No. 1-4 6.2 mgd (215 hp)(2) 5.6 mgd (215 hp)(2) 5.0 mgd (215 hp):2: 4.0 mgd (215 hp):2:
IPS No. 2-1 4.5 mgd (185 hp) 4.3 mgd (185 hp) 10.8 mgd (385 hp) 14 mgd (470 hp)
IPS No. 2-2 8.0 mgd (215 hp)(3) 7.8 mgd (215 hp):3) 10.8 mgd (385 hp) 14 mgd (470 hp)
IPS No. 2-3 8.0 mgd (215 hp)(3> 7.8 mgd (215 hp):3: 10.8 mgd (385 hp) 14 mgd (470 hp)
IPS No. 2-4 N/A(') 7.8 mgd (215 hp)O 10.8 mgd (385 hp) 14 mgd (470 hp)
Firm Capacity 24 mgd 31 mgd 42 mgd 50 mgd
Notes:
1. Consider relocating existing 160 hp pump from IPS No. 1 to this location until 12.0 mgd Expansion to provide operating
flexibility at lower flows with two smaller pumps.
2. Existing pumps to remain in service.
3. 215 hp pumps provide higher capacity(7 mgd)in IPS No.2 than in IPS No. 1 due to valve sizing and pipe velocities in
IPS No. 1 which have higher head loss.

Diversion Pumps (IPS Pumps 1-1 and 1-2)
The Twelve Mile Creek Water Reclamation Facility(TMCWRF)9.0 million gallons per day(mgd)
Expansion project will include installation of diversion pumps in existing Influent Pump Station(IPS)No.
1. The existing diversion pump station will be abandoned and/or partially demolished to: (a)power all
pumps(influent and diversion)from VFDs to optimize the IPS Electrical Building design with active
harmonic correction units; and(b) allow space for a future screening facility in the same location as the
diversion pump station.
500 0
450 0
System Curve(Tarkill On)
400 0 .
C E
System Curve(Tarkill Off)
350 0
Full Spd Pump Curve
E• 300 0 .• •
n — — Min Spd Pump Curve
250 0 —
err-�—
.............. ..... BEP
2000
POR1
1500 •
. -----AOR1
100 0 •
AOR2
500
00
0 500 1000 1500 2000 2500 3000 3500 4000
Pump Flow(ppm)
Proposed Diversion Pump Capacity(One pump running)

Union County Water
Twelve Mile Creek WRF Maximum Loss System Curve
Diversion Pumping Total Flow TDH less
Maximum Loss System Curve Flow per Pump TDH NPSHa Sta Losses
(gpm) (gpm) (ft) (ft) (ft)
Maximum Loss Operating Condition 0 0 209.0 35.7 209.0
Total System Flow,gpm 1527 1200 600 252.5 35.7 252.2
No.Pumps Operating 2 2400 1200 366.8 35.7 365.5
HGL at Discharge 689 High Level at Discharge 3600 1800 544.5 35.7 541.5
HGL at Suction 480 Low Wet Well Level 4800 2400 781.9 35.7 776.7
Static Head,ft 209 6000 3000 1076.8 35.7 1068.6
Total Head at Design Flow,ft 276.9 7200 3600 1427.3 35.7 1415.6
8400 4200 1832.1 35.7 1816.2
9600 4800 2290.0 35.7 2269.4
10800 5400 2800.1 35.7 2774.1
Site Conditions for NPSHa Calculations
Altitude of Site= 480 ft MSL System Friction and Minor Loss Factors
Atmospheric Pressure= 33.3 ft Sum Kf Sum Km
Water Temperature= 60 60 to 90 deg F Combined Suction 0.00E+00 0-00E+00
Vapor Pressure= 0.6 ft Individual Pump Suction 0.00E+00 0.00E+00
Elevation of Pump Impeller Eye= 477.0 ft MSL Individual Pump Discharge 1.14E-02 3.79E-02
Impeller Eye Submergence= 3.0 ft Combined Discharge 6.70E+00 2.49E-01
Define Piping System for Maximum Loss Curve:
Velocity Head
%of at Loss at
Pipe Diameter Length Total Pipe Flow Design Design
No. Description (inches) (feet) H&W C Sum K Flow (gpm) (fps) (ft) Kf Km
Individual Pump Discharge Piping
PD1 Pump Discharge 8.00 3.00 130 0.4 50% 764 4.9 0.2 3.44E-03 1.27E-02
PD2 Pump Discharge 12.00 50.00 130 4 50% 764 2.2 0.4 7.96E-03 2.52E-02
Common Discharge Piping
CD1 Header Section 1 12.00 20 130 3.1 50% 764 2.2 0.3 3.19E-03 1.95E-02
CD2 Forcemain 18.00 16120 130 6.8 100% 1527 1.9 12.8 1.29E+00 3.38E-02
CD3 Forcemain(+Tarkill PS) 16.00 14300 130 8.5 170% 2596 4.1 54.3 5.41E+00 1.96E-01

•
NP 3315 HT 3-455
Performance curve FLYGT
Duty point a xylem brans
Flow Head
1410 US g.p.m. 251 ft
Curves according to. Water,purcWater,pure[100%],39.2°F,62.421b/ft',1.6899E-5 ft'/s
(fl'=
330=Heed
320'
310-
300
290
280
270-
260-
250- _.._ 251 ft
240-
230=
220= 72.2 0
210-
200-
190-
180 `
170 a
180= -455 400mm
1504
140=
130=
120
11C 2
100=
90-
80-
70-
so-
50
40
30'-
20'-
10
1
°Efficiency — _ _ _ 66.6%
l%]_aural'Efficiency _ — -— _
60 =_ 4 nm 62_8%
50_
40
30 i
to-
1D
Power input P1 _4Oi 11�)
lro=Shed power P2 (t' I
160— 142.2 hp
120_ 134.1 hp
40'
[ft,NPSHR-selues A55400trn
554
50=
45
40-
30
25
20=
104
1406 US 9p.m.
iirltiilti il ir � l __
0 7(61 400 600 6(1f1 1000 1200 1400 1600 1600 2000 2760 7400 7601 7600 3(610 3260 (US 0 P m l
Curve:ISO 9906
Dan Joyce
Created on 8/10/2022 Last update 8/10/2022
II

Influent Pumps in IPS 1 (IPS Pumps 1-3 and 1-4)
The TMCWRF 9.0 mgd Expansion Project includes leaving two of the existing influent pumps in IPS 1 in
service. The 12"discharge piping,valves, electrical supply, and variable frequency drives(VFDs)are
planned for replacement,but otherwise these 215 HP pumps will continue to operate as they currently do.
> PERFORMANCE CURVE
DATE PROJECT; ISSUE PROD
2005-10-2� TWELVE MILE CK.P 2-4 ALT 2 5 C 3306/735
NO.OF TOT.MOM.OF 6 FREO. 60 HZ
BLADES 3 INERTIA.... 2 POLES.. 3.94 KGM CURVE NO
IMPELLER RATED VOLTAGE Q6O v 63-631
THROUGHLET... 1 O3"103 SPEED........ 1185 RPM MOTOR SHAFT 160 IMPELLER DIAMETER
POWER.......
Circulara. 215 h kW
TORQUE STARTING 1670 NM 480 MM
1/1-LOAD 9/4-LOAD 1/2-LOAD MAX MOTOR TYPE
MOTOR COS PHI 0.83 0.79 0.69 TORQUE....... 3340 NM 43-44-6BC /01(13)
RATED GEAR TYPE RATIO
MOTOR EFFICIENCY 93.5% 93.5% 93.0% CURRENT,.... 260 A
STARTING
GEAR EFFICIENCY _ CURRENT...... 1555 A
POWER -- -
[hp] -;)
200
150
a
100
50—4 ,-
0 —
DUTY POINis. FLOWIU9 .nI HEAD)11) EFF.(%) (NPSHRXIII GUARANTEE
1 9320 142 83.4(87.7) 19.0 HI level A
HEAD 2 3791. 138 67.7(72.3) ,8.9 HI IevelA (NPSHR)
3 5919 110 74.9(60.0) 19.6 HI level A
[ft] tt] EFF.
[%]
180 ,
160 11111111111.1b., ` � 00,......- I * -- " 80
IIIl • . _ iiU -'13570
12DU!U1//����111I11II
100 IIUIIIIIi ' 'POW R LI 125 50
80 I . uii.. JIlII .
1 !111111 ;iil120•. .•
AN
�riii.�•.-ji11111
40 ���_ 10 20
20 �ir�, ■t::r/ �%1IIlIl11 5 10
I 0
1110
S NOTE: 0 1000 2000 3000 4000 5000 6000 7000 8000 usgpm
1 CURVES SHOW PERFORMANCE WITH CLEAR COLD WATER. FLOW
•:PUMP EFFICIENCY/SHAFT POWER
0:OVERALL EFFICIENCY I INPUT POWER
(NPSHR)<(NPSH3)+margins

Influent Pumps in IPS 2 (IPS Pump 2-1)
includes one new 185 HP pumpto be located in IPS 2. This
The TMCWRF 9.0 mgd Expansion Project
pump will be the smallest influent pump and provide conveyance of low flows into the WRF. The pump
will be provided with 14"discharge piping,valves, electrical supply,and variable frequency drives
(VFDs).
PUMP DATA Guaranteed HI Acceptance Grade 38
Tull Speed Pump Curve: Vanable Speed Pump Curve Minimum Speed Pump Curve
(Set spd to meet typical flow condition) (Set spd to meet nun flow condition)
I.Ifr Flygt 97 w; 70 %
Model No: C 32311665 58 2 Hert 42 Hertz
Full Speed 1780 RPM 1725 5 rpm 1248 rpm
OPERATING CURVE S
Pump Operating Conditions
300.0
----System Curve
250.0 Max HI 38 Tolerance
ss
—Cu!Spd Pimp Curve
_.
200.0 Aln.HI 38 Tolerance
F `{�
----Vr Spd Pump Curve
r! 150.0 r `\ - - - Alm Spa Pump Curve
r
—_-- __ —BEP
100.0 t - �____� -- `jam • —PORT
• —POR2
50.0 -----AORI
-----AOR2
00
0 1000 2000 3000 4000 5000 0000 7000 8000 0000 '0000
Pump Row(Wm)
Proposed Influent Pump Capacity(Peak Flow Condition)

Union County Water
Twelve Mile Creek WRF Typical Loss System Curve
Influent Pumping(IPS 2) Total Flow TDH less
Typical Loss System Curve Flow per Pump TDH NPSHa Sta Losses
(gpm) (gpm) (ft) (ft) (ft)
Typical Loss Operating Condition 0 0 96.0 33 7 96.0
Total System Flow,gpm 17361 15972 4160 1000 97.3 33.7 96.7
No.Pumps Operating 4.16 8320 2000 100.8 33.7 98.8
HGL at Discharge 573.96 High Level at Discharge 12480 3000 106.6 33.7 102.1
HGL at Suction 478 Low Wet Well Level 16640 4000 114.5 33.7 106.5
Static Head,ft 95.96 20800 5000 124.4 33.7 112.1
Total Head at Design Flow,ft 116.0 24960 6000 136.3 33.7 118.7
29120 7000 150.3 33.7 126.3
33280 8000 166.2 33.7 135.0
37440 9000 184.2 33.7 144.7
Site Conditions for NPSHa Calculations
Altitude of Site= 483 ft MSL System Friction and Minor Loss Factors
Atmospheric Pressure= 33.3187 ft Sum Kf Sum Km
Water Temperature= 60 60 to 90 deg F
Vapor Pressure= 0.598 ft
Elevation of Pump Impeller Eye= 477 ft MSL Individual Pump Discharge 1.42E-03 4.93E-03
Impeller Eye Submergence= 6.0 ft Combined Discharge 1.04E-02 1.63E-03
Define Piping System for Typical Loss Curve (Input data defaults to same as Maximum Loss Curve unless modifed)
Velocity Head
%of at Loss at
Pipe Diameter Length Total Pipe Flow Design Design
No. Description (inches) (feet) H&W C Sum K Flow (gpm) (fps) (ft) Kf Km
Common Suction Piping(NOT USED)
Individual Pump Suction Piping(NOT USED)
Individual Pump Discharge Piping
PID1 Discharge Piping 14.00 54.00 110 6.3 24% 4167 8.7 8.6 1.42E-03 4.93E-03
Common Discharge Piping
PCD1 36"Discharge Header 36.00 9.00 110 0.3 24% 4167 1.3 0.0 2.38E-06 5.37E-06
PCD2 36"Discharge Header 36.00 9.00 110 0.3 51% 8854 2.8 0.0 9.61E-06 2.42E-05
PCD3 36"Discharge Header 36.00 9.00 110 0.3 78% 13542 4.3 0.1 2.11E-05 5.67E-05
PCD4 24"Flow Meter Section 30.00 25.00 110 0.9 78% 13542 6.1 0.7 1.43E-04 3.53E-04
PCD5 30"Discharge Header 36.00 250.00 110 0.3 78% 13542 4.3 0.6 5.86E-04 5.67E-05
PCD6 30"Force Main 30.00 2500.00 110 4.45 63% 10937 5.0 10.0 9.60E-03 1.14E-03

CP 3231/706 3—430
Performance curve FLYGT
Duty point a xylem brand
Flow Head
3500 US g.p.m. 141 ft
Curves according to: water,purcwater,pure I100%),39.2°F,62.42lb/ft3,1.6891E-5 ft/s
-Head
200-
190.
180=
170 •
=
180= \\
•
150:
140- 141 ft
1
Ij '430 375mm
50-
40-
30-
•
20-
10-
I1 Efficiency _ __ _ _ 77.1%
70-E O.erall Efficiency -- — _►
72.4%
80. Pr^
50=
40-E
30'
20-=
102
It Poster input P1 _ _ 172.1 hp
1 Shaft powerP2 - - 37755nen11617Ip
140=
120"
100
8afp0=
6 S-NPSHR-values 375mm
60-2
55=
so=
45=
40=
35=
30: NPSHR=32.809 ft
25; 23.5 ft
20-'
15= 3502 US pp.�m.
�'l . , l „ 1 „ I „ I I I I
0 400 800 1200 1600 2000 2400 2800 3200 3600 4000 4400 4800 5200 5600 6000 IUS g.p.m.]
Curve:ISO 9906
Dan Joyce
Created on 7/14/2022 Last update 7/14/2022
1

Influent Pumps in IPS 2 (IPS Pumps 2-2 and 2-3)
The TMCWRF 9.0 mgd Expansion Project includes two new 215 HP pumps to be located in IPS 2. These
pumps will be the largest influent pumps after this project is completed and will provide conveyance of
average and peak flows into the WRF. The pump will be provided with 18"discharge piping,valves,
electrical supply,and variable frequency drives(VFDs).
PUMP DATA Guaranteed HI Acceptance Grade' 38
Full Speed Pump Curve: Variable Speed Pump Curve Minimum Speed Pump Curve
(Set spd to meet typical flow condition) (Set spd to meet min flow condition)
Mir Flygt • 89 % • I 82 %
Model No C 3306/735 53.4 Hertz 49.2 Hertz
Full Speed 1185 RPM v 1054.65 rpm V 971.7 rpm
OPERATING CURVES
Pump Operating Conditions
200 0-
1900
- - System Curve
180 0 -Fur Spd Pt.np Curve
170 0
OD 0 ---•Vie Spd Pump Curve
1150 0 .s Ron Spd Ptenp Curve
1400 1,
BEP
1300 -PORI
—POR2
O. 1100 • _ - -•AOR1
1000
n 90.0 24 FM
80.0. • -X'
700
50 0 -
500
400 - --
30.0
200
100 •
00
0 1000 2000 3000 4000 5000 0000 700C 8000 9000 10000
pump Row loom)
Proposed Influent Pump Capacity(Peak Flow Condition)

Union County Water
Twelve Mile Creek WRF Typical Loss System Curve
Influent Pumping(IPS 2) Total Flow TDH less
Typical Loss System Curve Flow per Pump TDH NPSHa Sta Losses
(gpm) (gpm) (ft) (ft) (ft)
Typical Loss Operating Condition 0 0 96 0 33.7 96.0
Total System Flow,gpm 17361 15972 3700 1000 96.8 33.7 96.6
No.Pumps Operating 3.70 7400 2000 99.0 33.7 98.3
HGL at Discharge 573.96 High Level at Discharge 11100 3000 102.5 33.7 100.9
HGL at Suction 478 Low Wet Well Level 14800 4000 107.3 33.7 104.4
Static Head,ft 95.96 18500 5000 113.3 33.7 108.9
Total Head at Design Flow,ft 111.2 22200 6000 120.5 33.7 114.2
25900 7000 128.9 33.7 - 120.3
29600 8000 138.4 33.7 127.3
33300 9000 149.2 33.7 135.1
Site Conditions for NPSHa Calculations
Altitude of Site= 483 ft MSL System Friction and Minor Loss Factors
Atmospheric Pressure= 33.3187 ft Sum Kf Sum Km
Water Temperature= 60 60 to 90 deg F
Vapor Pressure= 0.598 ft
Elevation of Pump Impeller Eye= 477 ft MSL Individual Pump Discharge 5.20E-04 2.28E-03
Impeller Eye Submergence= 6.0 ft Combined Discharge 1.04E-02 1.64E-03
Define Piping System for Typical Loss Curve (Input data defaults to same as Maximum Loss Curve unless modifed)
Velocity Head
%of at Loss at
Pipe Diameter Length Total Pipe Flow Design Design
No. Description (inches) (feet) H&W C Sum K Flow (gpm) (fps) (ft) Kf Km
Common Suction Piping(NOT USED)
Individual Pump Suction Piping(NOT USED)
Individual Pump Discharge Piping
PID1 Discharge Piping 18.00 54.00 110 6.3 27% 4687 5.9 3.9 5.20E-04 2.28E-03
Common Discharge Piping
PCD1 36"Discharge Header 36.00 9.00 110 0.3 27% 4687 1.5 0.0 2.96E-06 6.80E-06
PCD2 36"Discharge Header 36.00 9.00 110 0.3 54% 9375 3.0 0.0 1.07E-05 2.72E-05
PCD3 36"Discharge Header 36.00 9.00 110 0.3 78% 13542 4.3 0.1 2.11E-05 5.67E-05
PCD4 24"Flow Meter Section 30.00 25.00 110 0.9 78% 13542 6.1 0.7 1.43E-04 3.53E-04
PCD5 30"Discharge Header 36.00 250.00 110 0.3 78% 13542 4.3 0.6 5.86E-04 5.67E-05
PCD6 30"Force Main 30.00 2500.00 110 4.45 63% 10937 5.0 10.0 9.60E-03 1.14E-03
J

•
CP 3306/736 3' 631
Performance curve
FLYGT
Duty point a xylem brand
Flow Head
3470 US g.p.m. 140 ft
Curves according to: Water,purcWater,pure[100%1,39.2'F,62.42 Ib/ft3,1.6891E-5 ft'/s
Ml-'Head
190=
180_
170-
180:
150,
14O .____- —..-- - - _-- _ 140ft
130:
•
11C-
•
10D R.
83. E
90
eo- �
•
70=
60- • 31 480mm
50
•
40_
30_ •
-
20-
10o-
Efficiency
7 Pewee Efficiency _�— � -aa}aaae.rr._ 70.5%
0 1
803, 65.8%
50=
40
30=
203
- i
lhp.=Pomt input P1 631 IPII
200_Shaft pover P2 188.7 t
160-= _174.3 hp
120
eo-
40-o- •
I
80--_-'-NPSHR+4dues ,631 480mm
50
45', •
40Lf
35
30_ • NPSHR=32.809 ft
25-=
20 —
1rr-'- 18.4ft
100 3469 US p.m.
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 [US g.p.m.]
Curve:ISO 9906
Dan Joyce
Created on 7/14/2022 Last update 7/14/2022

04 - AERATION
Union County FORM ATC-12-14
Twelve Mile Creek WRF Expansion Attachment for Section 3.H
NPDES No.NC0085359

Hazen
Aeration Design
The existing aeration system at the Twelve Mile Creek WRF includes four(4)diffused aeration basins
with anoxic-oxic treatment zones and NRCY pumping and has a current permitted capacity of 7.5 MGD.
The existing process volume is adequate for the 9.0 mgd Expansion. The only additional modification to
Expansion d the aeration sy requiredcompleteg stem to the 9.0 is the installation of a 4th blower to
increase capacity.
The existingblowers have capacity to deliver 5,350 scfm(two small blowers, each)and 7,980 scfm(large
P tY ( g
blower) at 100F,40%RH, 14.3 psia, 0.3 psi inlet loss. Existing total and firm blower capacity are 18,680
scfm and 10,700 scfm. One additional small blower(capacity 5,350 scfm)is proposed based on providing
firm capacity at the maximum month,max diurnal airflow and total capacity to meet max day. One
additional small blower provides 24,030 scfm total and 16,050 scfm firm capacity,which provides firm
capacity through max day for 9 mgd(i.e.beyond the required aeration capacity).
The following pages show the design conditions for the 9.0 mgd Expansion project.
•
Hazen and Sawyer•9101 Southern Pine Blvd, Suite 250• Charlotte, NC 28273 •704 357 3150

Project Information
Project Name-Twelve Mile Creek Expansion to 9.0 mgd
Location-Union County,SC
Date-4/8/2022
Engineer-jrohrbacher
1.Site Parameters
Area under Aeration per Basin(ft2) 9900
Side water Depth(ft) 13.5
Diffuser Submergence(ft) 12.5
Number of Diffusers per Basin 1,782
1 Site Elevation(ft above MSL) 560
Average Site Temperature(°C) 16
Diffuser Type 1 1-Fine bubble;2-Coarse bubble;3-Jet Aeration
2.Inputs
Loading Conditions
Condition Annual Max Month Max Month, Max Day Max Day,Max
Average Max Diurnal Diurnal
Aeration Basin Influent Flow 7.5 9.0 9.0 16.5 16.5
Number of Basins in Service 4 4 4 4 4
Influent Flow per Basin 1.88 2.25 2.25 4.13 4.13
Aeration Basin Influent BOD5 230 242 363 236 354
Aeration Basin Influent TKN 48.0 46.8 70.2 48 72
Secondary Effluent BOD5 0 0 0 0 0
Secondary Effluent TKN 0 0 0 0 0
Secondary Effluent Nitrate(w/o carbon feed) 10 10 12 12 14
Design Wastewater Temperature(°C) 20 27 27 27 27
DO Concentration(mg/L) 2 2 1 0.5 0.5
Denitrification Credit?Y or N y y y y y
Design Alpha Factor(oF) 0.64 0.64 0.64 0.64 0.64
Average or Minimum SOTE?A or M A A m m m
3.Actual(Process)Oxygen Requirement(AOR)Calculations
BOD5 Oxidized(lb/day) 14,387 18,165 27,247 32,476 48,714
TKN Oxidized(lb N/day) 2,523 2,907 4,361 5,523 8,284
BOD5 Oxygen Demand(lb 02/day) 17,264 21,797 32,696 38,971 58,457
TKN Oxygen Demand(lb 02/day) 11,529 13,286 19,930 25,239 37,858
Denitrification Credit(lb 02/day) (5,426) (6,168) (9,896) (11,072) (18,183)
Actual Oxygen Requirement(AOR)(lb 02/day) 23,367 28,916 42,729 53,138 78,132
4.Standard Oxygen Demand(SOR)Calculations
Oxygen Saturation Temp.Correction,t(Tau) 1.00 0.87 0.87 0.87 0.87
AOR/SOR 0.47 0.46 0.54 0.57 0.57
Standard Oxygen Requirement(lb 02/day) 49,444 62,283 79,611 92,742 136,365
5.Aeration Demand Calculations
Air required at 100%Transfer Efficiency,scfm 1,972 2,485 3,176 3,700 5,440
' Total Number of Diffusers 7,128 7,128 7,128 7,128 7,128
SOTE at Design Submergence and Diffuser Flow 28.0% 27.2% 25.5% 25.1% 24.1%
Diffuser Flow Macro Input,scfm/diffuser 0.99 1.29 1.75 2.07 3.17
Diffuser Flow Calculated,scfm/diffuser 0.99 1.29 1.75 2.07 3.17
Difference 0.000 0.000 0.001 0.000 0.000
Correct? Yes Yes Yes Yes Yes
Air Required at Design Efficiency 7,036 9,132 12,448 14,729 22,533
•
6.Checks
Minimum Mixing Airflow Requirement(scfm) 4,752 4,752 4,752 4,752 4,752
Minimum Mixing Requirement Met? Yes Yes Yes Yes Yes
Is Diffuser Flow Within Range? Yes Yes Yes Yes No
i

THIS PAGE INTENTIONALLY LEFT BLANK

05 - CLARIFIER 4
Union County FORM ATC-12-14
Twelve Mile Creek WRF Expansion Attachment for Section 3.H
NPDES No.NC0085359

Twelve Mile Creek Water Reclamation Facility
Secondary Clarifier 4 Design Calculations
9.0 mgd Expansion Project
Secondary Clarification
Design Secondary Effluent Flow= 9 mgd
Peak Secondary Effluent Flow= 22.5 mgd
RAS Flow(%MMADF)= 100%
RAS Flow= 9 mgd
Operational MLSS= 4300 mg/I
New Clarifier 4 Ex.Clarifiers 1 and 2 Ex.Clarifiers 5 and 6
Clarifier Diameter 100 ft 70 ft 85 ft
Clarifier Area 7,854 sq.ft. 3,848 sq.ft. 5,675 sq.ft.
Number= 1 2 2
Total Area= 7,854 sq.ft. 7,697 sq.ft. 11,349 sq.ft.
Total Areaone Unit Out ofService= 7,854 sq.ft. 7,697 sq.ft. 5,675 sq.ft.
Clarifier 4 Design Criteria All Units in Service One Unit Out of Service •
Design SCE Flow= 2.6 mgd 3.3 mgd
Peak SCE Flow= 6.6 mgd 8.3 mgd
RAS Flow(%MMADF)= 100% 100%
RAS Flow= 2.6 mgd 3.3 mgd
Parameter 10 States Stnd All Units in Service One Unit Out of Service
Design Peak Design Peak
Solids Loading Rate(Ib/d/ft2)= 35 24.00 41.99 30.41 53.22
Solids Loading Rate(Ib/hr/ft2)= 1.46 1.00 1.75 1.27 2.22
Surface Overflow Rate(gpd/ft2)= 900 335 836 424 1060
Weir Loading Rate(gpd/ft)= 30,000 8,364 20,911 10,601 26,501
Ten State Standards are Based on The Following:
Solids Loading Rate-Maximum Day Solids Loading for Nitrification
Surface Overflow Rate-Maximum SOR at Design Peak Hour Flow-Systems with Chemical Addition to Remove Phosphorus
Weir Loading Rate-Maximum Loading Rate at Design Peak Hour Flow

Union County,North Carolina
Twelve Mile Creek WRF
Hydraulic Profile
Startup Rated Buildout Rated 12mgd EXP Buildout
1 AADF AADF AADF Peak Flow Peak Flow Peak Flow
Current Design (Was 4.50) (Was 7.50)
Plant Influent Flow mgd [ 5.50 9.00 15.00 22.50 ' 2250 30b0 I. 4S.00'`
Number of 70'diameter Clarifiers= 2 2 2 2 2 2
Number of 85'diameter Clarifiers= 2 2 2 2 2 2 2
Number of 100'diameter Clarifiers= 1 1 2 1 2 3
Q(mgd)out of 70'diameter Clarifier= 0.8 1.3 1.6 3.2 4.5 3.3 4.0
Q(mgd)out of 85'diameter Clarifier= 1.2 1.9 2.5 4.8 6.8 4.9 6.0
Q(mgd)out of 100'diameter Clarifier= 1.6 2.6 3.4 6.6 0.0 6.8 8.3
Q(mgd)into 70'diameter Clarifier= 1.2 2.5 3.3 4.9 6.3 4.9 5.3
Q(mgd)into 85'diameter Clarifier= 1.7 3.8 4.9 7.3 9.5 7.4 8.0
Q(mgd)into 100'diameter Clarifier= 2.4 5.3 6.8 10.1 0.0 10.2 11.1
FLOW PATH FROM FILTERS TO CLARIFIER 4
Secondary Clarifier 4,5,and 6 Effluent Piping(Cross-Connector Pipe)
Module PIPH Piping by Hazen-Williams Equation
Diameter= 36 in Q(mgd)= r 05 ..?092 x.,. :240 . :2,31 r 033 ., A00 u .,,,,,,:li.42y..V4§;
Length= 55 ft V(fps)= 0.12 0.20 0.55 0.51 0.07 1.10 0.60
Hazen&Will.C= 110 Hv(ft)= 0.00 0.00 0.00 0.00 0.00 0.02 0.01
Minor Loss K's: BFV 0.3 Hf(ft)= 0.00 0.00 0.00 0.00 0.00 0.01 0.00
Branch Cross 1.5 Hm(ft)= 0.00 0.00 0.01 0.01 0.00 0.03 0.01
HL(ft)= 0.00 0.00 0.01 0.01 0.00 0.04 0.01
Sum K= 1.8
548.01 548.18 548.47 549.06 549.19 549.78 549.54
Secondary Clarifier 4,5,and 6 Effluent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 36 in Q(mgd)= 3.95 6.46 11.72 16.14 13,50 .44 . ,64
Length= 250 ft V(fps)= 0.86 1.41 2.57 3.53 2.96 5.13 6.28
Hazen&Will.C= 110 Hv(ft)= 0.01 0.03 0.10 0.19 0.14 0.41 0.61
Minor Loss K's: Run Tee 0.3 Hf(ft)= 0.03 0.07 0.20 0.36 0.26 0.72 1.04
90 Bend 0.3 Hm(ft)= 0.01 0.02 0.06 0.12 0.08 0.25 0.37
(Buffer) 0 HL(ft)= 0.03 0.08 0.26 0.48 0.34 0.97 1.41
Sum K= 0.6
548.04 548.27 548.73 549.54 549.53 550.75 550.95
Secondary Clarifiers 4 and 5 Effluent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= -in Q(mgd)= 2.78 4.55 5.86 11.37 6.75 11.72 14.33
Length= 1 ft V(fps)= 0.88 1.43 1.85 3.58 2.13 3.70 4.52
Hazen&Will.C 1" , Hv(ft)= 0.01 0.03 0.05 0.20 0.07 0.21 0.32
Minor Loss Ks: Run C '05 Hf(ft)= 0.02 0.04 0.07 0.24 0.09 0.25 0.37
Reducer 0.2 Hm(ft)= 0.01 0.02 0.04 0.14 0.05 0.15 0.22
HL(ft)= 0.03 0.07 0.11 0.38 0.14 0.40 0.59
Sum K= 0.+7
548.07 548.33 548.84 549.92 549.67 551.15 551.54
Secondary Clarifier 4 Effluent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 24 in Q(mgd)= 1.61 2.64 3.40 6.60 0.00 6.80 8.32
Length= 20 ft V(fps)= 0.79 1.30 1.68 3.25 0.00 3.35 4.10
Hazen&Will.C= 110 Hv(ft)= 0.01 0.03 0.04 0.16 0.00 0.17 0.26
Minor Loss K's: Reducer 0.1 Hf(ft)= 0.00 0.01 0.01 0.04 0.00 0.04 0.06
Branch Cross 1.5 Hm(ft)= 0.02 0.06 0.10 0.39 0.00 0.42 0.63
Entrance 0.5 HL(ft)= 0.03 0.07 0.12 0.43 0.00 0.46 0.69
BFV? 0.3
Sum K= 2.4
548.09 548.40 548.95 550.35 549.67 551.61 552.22

Secondary Clarifier 4 Drop Box
Module CCR Rectangular Closed Conduit by Mannings Equation
Width= 3 ft Q(mgd)= 1.61 2.64 3.40 6.60 0.00 6.80 8.32
Height= 5 ft V(fps)= 0.17 0.27 0.35 0.68 0 00 0 70 0.86
Length= 3 ft Hv(ft)= 0.00 0.00 0.00 0.01 0.00 0.01 0.01
Manning n i ',05 Hf(ft)= 0.00 0.00 0.00 0.00 0.00 0.00 0.00
SumK 44t 0,15 Hm(ft)= 0.00 0.00 0.00 0.01 0.00 0.01 0.01
HL(ft)= 0.00 0.00 0.00 0.01 0.00 0.01 0.01
548.09 548.40 548.95 550.36 549.67 551.61 552.23
Secondary Clarifier 4 Launder
Module OCLI Rectangular Lateral Inflow Channel
Invert Elft 4(mgd)= 0.81 1.32 1.05 3.30 0.00 4.16
Width th= ft Backwater(ft)= -161-1.91 -1.60 -1.05 036 -0.33 1.61 2 23
Length= ft Yc(ft)= 0.20 0.27 0.33 0.51 0.00 0.52 0.59
Slope= 0..0100 ft/ft Actual Depth(ft)= 0.20 0.27 0.33 0.51 0.00 1.61 2.23
Manningn= V-end(fps)= 2.52 2.97 3.23 4.03 #DIV/0! 1.30 1.15
Hf(ft)- 0.36 0.35 0.34 0.34 #DIV/0! 0.01 0.01
Yu(ft)= -0.27 -0.25 -0.22 -0.01 #DIV/0! 0.11 0.70
HGL 551.33 551.35 551.38 551.59 #DIV/0! 551.71 552.30
TOP OF WALL EL 555.00 Freeboard to Clarifier Wall(In)= 44 44 43 41 #DIV/0! 40
Secondary Clarifier 4 V-Notch Weir
Module WV V-Notch Weir
Weir El= 2.5 ft m d = 1. 1 .4 .SS 0 Q( g ) 6 2 64 3 0 6 60 0 00 6.80 8.32
#Notches= 604 Hw(ft)= 0.08 0.09 0 10 0 14 0 00 0 14 0 15
Depth of Notch= 2.5 in Weir Submerged? 'o No
Notch Overtopped? 'Jo No
552.58 552.59 552.60 552.64 #DIV/0! 552.64 552.65
. Freeboard to V-Notch(in)= 14 14 13 11 40IV/0! 10
SCI Energy Dissipating Inlet
Module MFR Manufacturer Head Loss Info
Reference Q `� 1.2: mgd Q(mgd)= 2.42 528 6.80 10.12 0.00 10.20 11.09
Reference HL ` 0.25 ft HL(ft)= 0.01 0 04 0 07 0 16 0 00 0.17 020
EGL•HOL. 552.59 552.64 552.68 552.80 #DIV/0! 552.80 552.85
Center Column
Module SCPC Secondary Clarifier Pier with concentric RAS pipe
Pier ID= ` 36 in Q(mgd)= 2.42 528 6.80 10.12 0.00 10.20 1109
RAS Pipe OD= 22 in
Length= 15 ft V(fps)= 0.85 184 2.38 3.53 0.00 3.56 3.87
Manning n= 0.015 Hv(ft)= 0.01 0.05 0.09 0.19 0.00 0.20 0.23
SumK 1.5 Hf(ft). 0.01 0.03 0.04 0.10 0.00 0.10 0.12
Flow Area(sf)= 4.43 sf Hm(ft)= 0.02 0.08 0.13 0.29 0.00 0.30 0.35
Rh= 0.291666667 ft HL(ft)= 0.02 0.11 0.18 0.39 0.00 0.40 0.47
EGL i HGL 552.61 552.74 552.85 553.19 #DIVIO! 553.20 553.31
Secondary Clarifier 4 Influent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 30 in Q(mgd)= 2.42 5.28 6.80 10.12 ! 0.00 10.20 11.09
Length= 255 ft V(fps)= 0.76 1.66 2.15 3.19 0.00 3.22 3.50
Hazen&Will.C= 110 Hv(ft)= 0.01 0.04 0.07 0.16 0.00 0.16 0.19
Minor Loss K's Exit 1 Hf(ft)= 0.03 0.11 0.18 0.38 0.00 0.38 0.45
90 Bends 0.6 Hm(ft)= 0.02 0.11 0.18 0.40 0.00 0.40 0.47
45 Bends 0 9 HL(ft). 0.05 0.22 0.36 0.77 0.00 0.79 0.92
Sum K= 2.5
552.66 552.97 553.21 553.96 #DIV/01 553.99 554.24
Secondary Clarifier 4 Influent Piping
Module PIPH Piping by Hazen-Williams Equation
Diameter= 24 in Q(mgd)= 2.42 5.28 I 6.80 I 10.12 0.00 I 10.20 11.09
Length= 5 ft V(fps)= 119 2 60 1 3.35 I1 4.99 0.00 5.03 5.46

Hazen&Will.C= 110 Hv(ft). 0.02 0.11 0.17 0.39 0.00 0.39 0.46
Minor Loss K's: Entrance 0.5 Hf(ft)= 0.00 0.01 0.01 0.02 0.00 0.02 0.03
Increaser 0.2 Hm(ft)= 0.02 0.07 0.12 0.27 0.00 0.27 0.32
HL(ft)= 0.02 0.08 0.13 0.29 0.00 0.30 0.35
Sum K= 0.7
552.68 553.05 553.35 554.25 #DIV/0! 554.28 554.59
MLSS Dist.Box Effluent Weir to Clarifier 4
Module WS Sharp Crested Weir
Weir Elev= 557.00 ft Q(r„gd)= 2.42 5.28 6.80 10.12 0.00 10.20 11.09
Length= 6 ft Hµ.(ft)= 0.33 0.55 0.66 0.85 #DIV/0! 0.86 0.91
cam,= 3.3 Weir Submergence(H2)= 0 00 0.00 0.00 0.00 #DIV/0! 0.00 0.00
<If Subm> Hi(ft)= 0.00 0.00 0.00 1.06 0.00 0.00 1.12
<If Subm>Iterate 0 vv> 0 000 0.000 0.000 0.000 #DIV/01 0 000 0.000
Check nv> Not Subm Not So: Not SW: Not Subm. Not Subr,
557.33 557.55 557.66 557.85 #DIV/0! 557.86 557.91
New Distribution Gates
Module FPR Free Surface Rectangular Port
Invert El= 553.25 ft Q(mgd)= 2.42 5.28 6.80 10.12 0.00 10.20 11.09
Width= 4 ft Backwater(ft)= 4.08 4.30 4.41 4.60 #DIV/0! 4.61 4.66
Length= 6 in Yc(ft)= 0.30 0.51 0.60 0.78 0.00 0.79 0.83
No.Suppressed Contr= 0(0-3) Act.Depth(ft)= 4.08 4.30 4.41 4.60 #DIV/0! 4.61 4.66
UP= 0.04 0.04 0.04 0.04 #DIV/0! 0.04 0.04
Cd= 0.62 0.62 0.62 0.62 #DIV/0! 0.62 0.62
V(fps)= 0.23 0.47 0.60 0.85 #DIV/0! 0.86 0.92
HL(ft)= 0.00 0.01 0.01 0.03 #DIV/0! 0.03 0.03
EGL=HGL 557.33 557.56 557.67 557.88 #DIV/0! 557.89 557.94
TOP OF WALL EL 560.00 Freeboard to TOW(in)= 32 29 28 25 #DIV/0! 25 25

THIS PAGE INTENTIONALLY LEFT BLANK

06 - RAS PUMPS
Union County FORM ATC-12-14
Twelve Mile Creek WRF Expansion Attachment for Section 3.H
NPDES No.NC0085359

Twelve Mile Creek Water Reclamation Facility 9.0 mgd Expansion Project
RAS Pump Station B Summary
The Twelve Mile Creek WRF 9.0 mgd Expansion Project includes construction of a new Return
Activated Sludge(RAS Pump Station B which will serve the new Clarifier 4 and a future Clarifier 3. The
new RAS PS.B is designed as a submersible pump station with three wetwells that each contain a-RAS
pump. The middle wetwell is provided only for facility redundancy.
As shown in the Clarifier 4 design calcs,the maximum RAS flow rate will be encountered during a peak
flow event with either Clarifier 5 or 6 out of service,and also assuming 100%RAS flow rate. During this
condition,the pump must be capable of conveying 3.3 MGD back to the Aeration Tank Distribution
Structure through the combined RAS header.
PUMP DATA Guaranteed HI Acceptance Grade 38
Full Speed Pump Curve: Variable Speed Pump Curve Minimum Speed Pump Curve
(Set spd to meet typical flow condition) (Set spd to meet min flow condition)
Mfr: Flygt 1 _ 86 n .c
Model NO: NP3202MT€42 __4 Heil: 1'7F. Hertz
Full Speed 1165 RPM ' 102,8 8F rpm v- 722.9E rpm
OPERATING CURVES
Pump Operating Conditions
1000
-Max Loss System
00 D Cuve
----Typ Loss System Give
80 0 - Ain Loss System Curve
70.0 • -•- Max.H1 38 Tolerance
_ '� . -FJSpdPimpCurve
i 50.0 ,.- ✓aaC=2,3000:n gi- --DI- _-_
a f Afro.HI 38 Tolerance
E 50.0 +..t4 ----VarSpdPurpCurve
a of, Min Spd Pimp Curve
i
r -SEP
30.0 -POR1
`� �' 4 -POR2
20.0 i��-
10.0 AOR2
0.0
0 500 1000 1500 2000 2500 3000 3500 4000 4500
Pump Flow)gpm)
Proposed RAS Pump Capacity(Peak Flow Event with 1 Unit OOS)

Union County
Twelve Mile Creek WRF Maximum Loss System Curve
RAS Pump Station B Total Flow TDH less
Maximum Loss System Curve Flow per Pump TDH NPSHa Sta Losses
(gpm) (gpm) (ft) (ft) (ft)
Maximum Loss Operating Condition 0 0 22.0 54.7 22.0
Total System Flow,gpm 6250 1029 300 22.3 54.7 22.2
No.Pumps Operating 3 43 2058 600 23.3 54.7 22.8
HGL at Discharge 570 High Level at Discharge 3087 900 24.9 54.7 23.7
HGL at Suction 548 Low Wet Well Level 4116 1200 27.1 54.7 24.9
Static Head,ft 22 5145 1500 29.8 54.7 26.4 I
Total Head at Design Flow,ft 33.4 6174 1800 33.1 54.7 28.3
7203 2100 37.0 54.7 30.4
8232 2400 41.5 54.7 32.9
9261 2700 46.5 54.7 35.7
Site Conditions for NPSHa Calculations
Altitude of Site= 525 ft MSL System Friction and Minor Loss Factors
Atmospheric Pressure= 33.3 ft Sum Kf Sum Km
Water Temperature= 60 60 to 90 deg F Combined Suction 0.00E+00 0.00E+00
Vapor Pressure= 0.6 ft Individual Pump Suction 0.00E+00 0.00E+00
Elevation of Pump Impeller Eye= 526.0 ft MSL Individual Pump Discharge 5.19E-03' 2.21E-02
Impeller Eye Submergence= 22 0 ft Combined Discharge 2.60E-02 1.56E-02
Define Piping System for Maximum Loss Curve:
Velocity Head
%of at Loss at
Pipe Diameter Length Total Pipe Flow Pipe Flow Design Design
No.- Description (inches) (feet) H&W C Sum K Flow (gpm) (MGD) (fps) (ft) Kf Km
Common Suction Piping
Individual Pump Discharge Piping
PD1 Pump Discharge 8.00 5.00 120 1 29% 1813 2.6 11.6 2.4 2.43E-03 1.07E-02
PD2 Pump Discharge 12.00 39.00 120 5.3 29% 1813 2.6 5.1 2.5 2.63E-03 1.12E-02
PD3 Pump Discharge 16.00 8.00 120 0.3 29% 1813 2.6 2.9 0.1 1.33E-04 2.01E-04
Common Discharge Piping
CD1 Header Section 1 16.00 152.00 120 1.8 29% 1813 2.6 2.9 0.6 2.52E-03 1.21E-03
CD2 Common Discharge 1 16.00 20.00 120 1.5 58% 3625 5.2 5.8 0.9 1.20E-03 4.02E-03
CD3 Common Discharge 2 24.00 218.00 120 2.8 100% 6250 9.0 4.4 1.5 4.97E-03 4.41E-03
CD4 Common Discharge 3 24.00 665.00 120 3.3 107% 6706 9.7 4.8 3.4 1.73E-02 5.98E-03

NP 3202 MT 3"'642
Performance curve
FLYGiT
Duty point a xylem brand
Flow Head
2240 US g.p.m. 44.7 ft
Curves according to: Water,purEWater,pure[100%1,39.2'F,62.42 Ib/ft,1.6891E-5 ft2/s
In, Head
84H.
80=
76-
72-
68-
64-
60=
56-
52-
48-
44- 81 2. 44.7 ft
40-
36-
32-
28-
24-
20-
.•2 334mm
16-
12-
0-Efficiency 81
[0-Qerall Efficiency
72.2 96
=
50 2334
60 y 3333n4 _..
a0= mm
30
20=
10=
Power input P1 642 334mm(P1.) 35.1 hp
35=Shaft power P2 __ 642 334mm LP21
30= 31.3 hp
25l
20=
10"
• 5=
0=
[R:_HPSHRAalues 2 334mm
28-
za=
20-
16H
12- 13.6R
22,42 US m.
0 400 800 1200 1600 2000 2400 2800 3200 3600 [US g.p.m.)
• Curve:ISO 9906
Dan Joyce
Created on 9/15/2022 Last update 9/15/2022

07 - METAL SALTS FACILITY
Union County FORM ATC-12-14
Twelve Mile Creek WRF Expansion Attachment for Section 3.H
NPDES No.NC0085359

Twelve Mile Creek WRF
Metal Salts Usage for Phosphorus Removal Plant Conditions
Dec-22 Design Flow Rate(mgd) 7.5
Secondary Effluent P043 (mg/I) 6.00
Threshold P043 (mg/I)[precip/hydr] 1.00
Final Effluent P043 (mg/I) 0.10
P043-Removed>1.0 mg/I)(Ib/d) 313
P043 Removed<1.0 mg/I)(Ib/d) 56
Metal Salt Consumed Sodium
Aluminate
Supplier Brenntag
Chemical Phosphorus Precipitation Formula Na2A1204
Sodium Aluminate Na2A1204+2P043 +4H20-*2AIP04+2NaOH+60H MW solution(g/mol) 164
Mole A13+ 2
Mole P 2
Mole A137mole P 1
Chemical Alkalinity Mole AI3+/mole P Factor(<1.0 mg/I) 3.5
Sodium Aluminate Na2A1204+4H20 2A1(OH)3+2Na.+20H MW A13`(g/mol) 26.98
MW P(g/mol) 30.97
g AI3+/g P 0.87
g A137 g solution 0.33
%Solution 38%
NOTES: Density,lb/gal 12.7
(1)For PACT:Exact chemical structure varies by product lb A13#/gal solution 1.59
(2)Sodium aluminate adds alkalinity(others consume alkalinity) gal solution/lb P(>1.0 mg/I)removed 0.55
gal solution/lb P(<1.0 mg/I)removed 1.92
Chemical Demand(gal/d) 280
$/gal solution $3.56
Chemical Cost($/d) $995
Alkalinity Consumed
Moles of HCO3-/NaOH -2
MW of 1-1CO3-/NaOH 40
g of HCO3-/NaOH -80
Chemical Formula Molecular Equivalent lb Alkalinity 40
Weight Weight as CaCO3 Equiv weight HCO3-/NaOH
REFERENCE• CaCO3 100.09 50.05 1.00 Equiv weight CaCO3 50
Lime slurry Ca(OH)2 74.10 37.05 0.74 g CaCO3 consumed/g coag -0.61
Magnesium hydroxide Mg(OH)2 58.33 29.17 0.58 lb coag/lb P(>1.0 mg/I)removed 2.65
Sodium hydroxide(caul NaOH 40.00 40.00 0.80 lb coag/lb P(<1.0 mg/I)removed 9.27
lb alk consumed as CaCO3/lb P removed -1.61

Hazen
Metal Salts Metering Pumps
The chemical metering pumps are sized to convey a 62%sodium aluminate solution(which is currently in
use at the plant) over a range of flows from 2.4—23.8 gph at up to 60 psi.
Hazen and Sawyer•9101 Southern Pine Blvd, Suite 250•Charlotte, NC 28273•704.357.3150

Client Union County Water
Facility Twelve Mile Creek WRF
Service Sodium Aluminate
INPUT DATA
Operating Conditions
HGL at Discharge,ft MSL 565.00 Aeration Effluent Channel
HGL at Suction,ft MSL 554.25 MS Tank Drain
Pump CL Elevation,ft MSL 557.00
Site Elevation,ft MSL 554.25
Temperature= 32 **Use minimum anticipated temperature
Atmospheric Pressure,ft= 33.2
Vapor Pressure,ft= 0.3
Flow Conditions
Design System Flow,gpm 0.450 24 gph
Number of Pumps Operating 1
Design Flow per Pump,gpm 0
Chemical Properties
Density,p(lb/gal): 11.09 lb/gal
Density, p(lb/cu ft): 82.95 lb/ft
Viscosity conversion: 1 cP= 0.00067197 lb/ft s
Viscosity(cp): 60 **Use viscosity based on chemical temperature
Pipe Roughness,e(ft) 0.00007
Add"Current Calculation"Results e= 0.00007 PVC,sourced from HazenPro
to Summary Table e= 0.00015 Steel and Wrought Iron
Head Loss Calculations Results of Current Calculation
Copy data
Pipe Darcy Pipe Friction Minor Data Summary
Pipe Viscosity,p Reynolds Total Head
Flow Velocity(fps) Friction Roughness, Losses Losses System Flow,gpm 0
Number 6 4m (cP) No.,Re Factor,f e ft Hf ft Hm ft Loss(ft) Pump Flow,gpm 0
Suction Piping Discharge HGL,ft 565.0
1 0.450 0.0 60.00 15.75 4.06294 0.000070 0.03 0.00 0.03 Suction HGL,ft 554.3
2 0.450 0.0 60.00 15.75 4.06294 0.000070 0.01 0.00 0.01 Total Static Head,ft 10.8
3 0.450 0.3 60.00 42.01 1.52360 0.000070 0.20 0.00 0.20 Pump Submergence,ft -2.8
4 0.450 0.0 60.00 0.00 0.00000 0.000070 0.00 0.00 0.00 Worst Case:
5 0.450 0.0 60.00 0.00 0.00000 0.000070 0.00 0.00 0.00 Suction Loss 0.2
6 0.450 0.0 60.00 0.00 0.00000 0.000070 0.00 0.00 0.00 Discharge Loss 93.1
7 0.450 0.0 60.00 0.00 0.00000 0.000070 0.00 0.00 0.00 Discharge Pressure,psi 58.2
8 0.450 0.0 60.00 0.00 0.00000 0.000070 0.00 0.00 0.00 Total Head(ft) 104.1
9 0.450 0.0 60.00 0.00 0.00000 0.000070 0.00 0.00 0.00 Total Head(psi) 59.9
10 0.450 0.0 60.00 0.00 0.00000 0.000070 0.00 0.00 0.00 Suction head,ft -3.0
Discharge Piping NPSHa 30.0
1 0.450 0.3 60.00 42.01 1.52360 0.000070 1.01 0.01 1.02
2 0.450 0.7 60.00 63.01 1.01574 0.000070 4.09 0.00 4.09
3 0.450 0.7 60.00 63.01 1.01574 0.000070 15.34 0.00 15.34
4 0.450 0.7 60.00 63.01 1.01574 0.000070 17.38 0.00 17.38
5 0.450 0.7 60.00 63.01 1.01574 0.000070 28.63 0.00 28.63
6 0.450 0.7 60.00 63.01 1.01574 0.000070 16.36 0.00 16.36
7 0.450 0.7 60.00 63.01 1.01574 0.000070 10.23 0.01 10.24
8 0.450 0.0 60.00 0.00 0.00000 0.000070 0.00 0.00 0.00
9 0.450 0.0 60.00 0.00 0.00000 0.000070 0.00 0.00 0.00
10 0.450 0.0 60.00 0.00 0.00000 0.000070 0.00 0.00 0.00

520U m AN/REM 30-60 psi NEMA 4X pumps 500 ._
fitted with LoadSure® element pumpheads
i. .a son-1 ar ow =re.e
• Flow rates up to 23.8 gph (1500 mI/min) at 60psi (4 bar) peak pressure with
i _ -
520 LoadSure" elements
• 520REM pumphead features large swept volume with sprung rollers for high '
accuracy, gentle pumping of shear-sensitive fluids =
• Robust pumphead construction with PPS (polyphenylene sulphide) track and -
rotor and stainless steel rollers and bearings 7 '
• Precise 2200:1 speed control range from 0.1 to 220rpm in 0.1 rpm increments - -
• Maintenance free brush less DC motor .n�
• NEMA 4X washdown protection for corrosive and heavy duty industrial t 2-4 bar
environments �" ' 30-60 psi
• Manual control with additional flow calibration and MemoDose for accurate •
single shot dispensing
6 211 (------
,...._)
• Dual voltage, 115V/230V 50/60Hz wa"ty
FUNCTIONALITY
Pump drives 520UmAN
Manual control
Simple calibration to display flow in ml/min
Choice of flowrate or speed display •
Remote control
Run/Stop, direction change,Auto/manual toggle, Leak detector
nput (via contact closure or 5V TTL or 24V industrial logic)
Remote operation of MemoDose(foot/hand-switch or logic input) •
Analog speed control
Software programmable inputs; 0-10V, 1-5V or 4-20mA
Analog outputs; 0-10V(8 bit resolution)
Analog outputs; 0-10V,4-20mA(8 bit resolution) •
Tacho frequency output; 0-1258Hz I •
111.11M111lMillilM
PERFORMANCE
LoadSure® Element tubing flow rates, ml/min(gph)
Tube Material -_ Speed - 3.2mm 6.4mm
Sta-Pure, Chem-Sure, 0.1 to 220rpm 0.18-390(0.003-6.2) 0.70-1500(0.01-23.8)
Marprene TM 0.1 to 220rpm 0.17-370(0.003-5.9) 0.67-1500(0.01-23.8)
mi/min MarpreneTM 30-60psi CCW 200rpm gph ml/min Ste-Pure 30-60psi CCW 200rpm gph
1400 — 22.2 1600 - — 25.4
1200r6.4mm 19 0 1400 6.4mm 22.2
1200 19.0 To achieve 60psi
1000 15.9
1000 15.9 pressure the
800 12.7 800 12 7 pump must rotate
9.5 counter-clockwise
600 ' 9.5
00 6.3 400 — -- 6.3
3/mm 3.2mm
200 3.2 200 3/
0 0 0 0
-14.5 -7.3 0 0 14.5 30 43.5 60 -14.5 -7.3 0 0 14.5 30 43.5 60
Suction Pressure Suction Pressure
—, (-)Pti (+)psi ! —�'� OPsi (-nips III

THIS PAGE INTENTIONALLY LEFT BLANK

08 - WAS BLENDING PUMP
Union County FORM ATC-12-14
Twelve Mile Creek WRF Expansion Attachment for Section 3.H
NPDES No.NC0085359

Hazen
WAS Blending Pump
One solids treatment operating strategy at the plant is to thicken WAS prior to aerobic digestion. Typical
TWAS concentration is approximately 5%. The proposed WAS blending pump allows a portion of
unthickened WAS to bypass the thickeners (GBTs)to manage the feed concentration of sludge into the
aerobic digesters. The schematic below shows approximate distribution of WAS to achieve a typical feed
concentration of 2%to the aerobic digesters,resulting in approximately 70-80%of the WAS being
thickened and 20-30%of the WAS being bypassed to blend with TWAS. This ratio will vary depending
on WAS solids concentration,TWAS solids concentration and the target BFP feed solids concentration.
WAS Blending
Pump
Flopo0.7%TS � 20•30%
SXTS 2%TS
•
SIP 70-sox
WAS Pump Gravity Belt TWAS Pump Sludge Storage BFP Feed Belt Fitter Truck
Thickener Tanks Nos.182 Pump Press Loadout
The following page shows the design calculations for the WAS blending pump.
Hazen and Sawyer•9101 Southern Pine Blvd, Suite 250•Charlotte, NC 28273•704.357.3150

•
•
•
•
Union County Water
Twelve Mile Creek WRF
WAS Blending Pump
INPUT DATA ,
Operating Conditions
HGL at Discharge,ft MSL 568.00 Digesters 1 and 2(Sludge Holding Tanks)
HGL at Suction,ft MSL 578.50 WAS Header
Pump CL Elevation,ft MSL 572.50 •
Sludge Solids Concentration% 5.0%
Sludge Type Factor 1.0 Undigested Sludge=1.5,otherwise 1.0-See Sanks p.580
Additional SF 1.0 Engineers additional safety factor
Water/Sludge Temperature= 60 60 to 140'F
Atmospheric Pressure,ft= 33.2 Calculation assumes site elevation=Suction HGL
Vapor Pressure,ft= 0.6
Grinder Information(See"Grinder Info"tab) Calculations assume that grinder is located in suction piping
Grinder Model No.(JWC) 0-None Select model number or"0-None"if no grinder in system
Grinder Flowrate,gpm 0 Create link to System Flow or Pump Flow Below(Zero if No Grinder)
Grinder Diameter Pipe Size-inch) 0 This value calculated based on Mfr Info on'Grinder Info"Tab
Grinder Max Flow(gpm) 0 This value calculated based on Mfr Info on'Grinder Info"Tab
Grinder HL at Max Flow(ft) 0.00 This value calculated based on Mfr Info on"Grinder Info"Tab
Flow Conditions
Design System Flow,gpm 300 Flaw used for Current Calculation Add"Current Calculation"Results
Number of Pumps Operating 1 to Summary Table
Design Flow per Pump,gpm 300
ad Loss Calculations Results of Current Calculation
Copy data
Pipe Clean Water Minor Data Summary
Pipe Flow Pipe Velocity Friction Loss Losses Worst Case Routine Worst Case Routine Head System Flow,gpm 300
Number (gpm) (fps) Hf(ft) Hm(ft) SMF SMF Head Loss(ft) Loss(ft) Pump Flow,gpm 300
Suction Piping Discharge HGL,ft 568.0
1 Not mooehng• 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Suction HGL,ft 578.5
2 any suction 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Total Static Head,ft -10.5
3 piping-the 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Pump Submergence,ft 6.0
4 WAS pumps 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Sludge Concentration 5.0%
5 essentially 0.0 0.00 '0.00 0.00 0.00 0.00 0.00 Sludge Type Factor 1
6 pump to the 0.0 0.00 0.00 . 0.00 0.00 0.00 0.00 Additional Safety Factor 1
7 elevation of the 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Grinder Loss,ft 0.00
8 WAS Blending 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Worst Case:
9 Pump. 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Suction Loss 0.0
10 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Discharge Loss 22.2
Discharge Piping Total Head 11.7
1 300 3.4 0.09 0.45 6.47 2.99 1.04 0.72 Discharge Pressure,psi 7.7
2 345 3.9 0.32 0.21 5.04 2.37 1.81 0.96 Suction head,ft 6.0
• 3 345 3.9 0.22 0.48 5.04 2.37 1.57 0.99 NPSHa 38.6
4 345 3.9 3.29 1.21 5.04 2.37 17.80 8.99 Routine:
•
5 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Suction Loss 0.0
6 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Discharge Loss 11.7
7 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Total Head 1.2
8 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Discharge Pressure,psi 3.1
9 0.0 0.00 0.00 0.00 0.00 0.00 0.00 Suction head,ft 6.0
10 0.0 0.00 0.00 0.00 0.00 0.00 0.00 NPSHa 38.6 .

THIS PAGE INTENTIONALLY LEFT BLANK

09 - DESIGN INFLUENT CONCENTRATIONS
AND PROCESS DESIGN CHARACTERISTICS
Union County FORM ATC-12-14
Twelve Mile Creek WRF Expansion Attachment for Section 3.H
NPDES No.NC0085359

gel
•
4. Secondary Process Model and Design Characteristics
A calibrated BioWinTM model for the Twelve Mile Creek WWTP was developed as part of the
"Phosphorus Removal Optimization Study" (PROS; Hazen and Sawyer, 2006). BioWinTM is a
dynamic wastewater treatment process modeling and simulation software package widely utilized for
process design and optimization. This model was calibrated using historical data from 2004-2006.
The model was updated based on historical data from 2003-2013 and special sampling performed
in December 2013,for evaluation of the expansion alternatives detailed in Section 5. Historical data
was used to update the influent wastewater concentrations, while the special sampling event was
used for a more detailed look into the process operations and COD influent fractionation. This
section will describe the results of the historical data analysis, updated calibrated model, and
modeling results.
4.1 Wastewater Characterization
Historical data from June 2003 through October 2013 were used to characterize the influent
wastewater and develop annual average flows, concentrations and loads. Daily influent flow,
temperature, total suspended solids (TSS) and 5-day biochemical oxygen demand (BOD5) data
were available. TSS and BOD5 samples are collected and analyzed on weekdays only. In addition,
influent samples are analyzed weekly for ammonia (NH3-N),total nitrogen (TN)and total phosphorus
(TP). It is assumed, for the purposes of the wastewater characterization, that the influent
concentrations of nitrate (NO3) and nitrite (NO2) are insignificant and that the influent TN is
equivalent to the total Kjeldahl nitrogen (TKN)concentration. Monthly average influent and effluent
flow, and influent concentrations and loads for BOD, TSS, TP, TN and NH3 are presented in
Figures 4-1 through 4-6 and tabulated in Appendix C.
Influent samples are collected using a 24-hour flow weighted composite sampler located in the grit
facility. Recycles are returned downstream of the grit facility, and are not included in the influent
composite samples.
The Twelve Mile Creek WWTP has been divertingflow to the McAlpine Creek WWMF since
P
November 2012. In 2013 the diversion flow averaged approximately 0.80 mgd. The diversion pump
station flow is presented in Figure 4-1, and when added to the effluent flow, is presented as "Total
Flow". Figure 4-2 through 4-6 present the total load to the Twelve Mile WWTP including the diverted
load to the McAlpine Creek WWMF.The time period when flow was diverted to the McAlpine Creek
WWMF is shaded blue.
Twelve Mile Creek Facilities Planning Report 4-1 rT.�,,'T AND
February 2015 �v AND SAWYER
Environmental Engineers 8 Scientists

Figure 4-1: Historical Influent and Effluent Flow
-a-Effluent Flow +-Influent Flow -•-Diversion Pump Station Flow -Total Flow
6
•
4
E3
2
reVPAPV1
0
M th 8 to 8 8 '8 h O O O O O O N N M th
O O � O O O O O O O O O O
7 0 7 U C 7 C 3 C C 5 C 3 c 7 C C
Figure 4-2: Historical Influent BOD5 Concentration and Load
-•-BOD Concentration -+-BOD Load
450 18,000
400 16,000
350 14,000
t300 12,000
co
c
250 — 10,000 c-
200 8,000 -
p 150 fv 6,000 in
m
100 + 4,000
50 2,000
0 III 1 , , < < la , 0
4 2O 4 8'O O 4 Y ~ 4 Q 4 Ei3rn Q 0 0 ` '- N
O O
6 = U 5 C c C C C C C C
Twelve Mile Creek Facilities Planning Report 4-2 HAM
AND
(r�
February 2015 j]('1(�Lj�AND Sk
Environmental Engineers&Scientists

CP
. 6
s7
Figure 4-3: Historical Influent TSS Concentration and Load
-+-TSS Concentration -•-TSS Load
700 21,000
600 18,000
11500 15,000
eb
E 1 ,
0 400 I 12,000 33
0
300 it i IAA�j -. :::
t200 ;1111 ! -
100 3,000
C) fr) 4. t() fD - 1? 2 0) O) O) O O — — N N C)
0 0 9 o C? 9 O Q O C7 O C�
3 V 3 U = C C = C = C 3 C 5 C 3 C C 5
0 17
Figure 4-4: Historical Influent TP Concentration and Load
-.-TP Concentration -+-TP Load
14 -- 420
12 360
^10 11
t 300
t
C 6 f,f 2401
° iiiiik.41 tii\le 111III
6 iAvekr \i II , i it, 1801§
4 r
a
F 4 1 120
2 60
O O O to O O O (~ O O p O O e— N N c+7
C) 5 o C 7 C C 5 C 5 C 7 C 7 C C 3
0 _' 0 —) ' —)
Twelve Mile Creek Facilities Planning Report 4-3 lJtil1111\L�l\Lr`W=,�„,YER February 2015
Environmental Engineers&Scientists

0
Figure 4-5: Historical Influent TN Concentration and Load
-+-TN Concentration -•-TP Load
70 2,800
60 2,400
. a E
i 2,000
a
1
g 1,200
U , 11 Z
H
a- 20 800
10 400
0 0
C7 c,/ 8 to tD ` t: OD O O N N M c"
-?5 9 - -5 9 Y R g 9 � 9 9 C C 5 , C
Figure 4-6: Historical Influent NH3 Concentration and Load
-NH3-N Concentration -•-NH3-N Load
45 — — 1,800
40 1,600
35 t t 1,400
rn 1
E 30 ::I
25ISICM 1if#
20 41 I 800 Z
U ,,ddltyli{i
? 15 1 600 z
2 10 400
5 200
tipp 0
C7 lh 4 g, '4 t0 8 N O O W p O O v— 1— N N M
— G — C — Q , Q ,
7 7 U = C 5 C = C 7 C ' C 7 C ' C ' 3
Twelve Mile Creek Facilities Planning Report 4-4 jT.�„�T AND SAWYER
February 2015 ,Ev AND DYER
Environmental Engineers 4 Scientists

e
Influent flow steadily increased from 2004 - 2008 and then remained constant from 2009 - 2013.
Beginning in 2006, the facility began to monitor effluent flow. Union County stopped reporting
influent flow at the end of July 2012. Loads from June 2003 - July 2012 were calculated based on
influent flow. Loads from August 2012 through the present were calculated using effluent flow plus
flow transferred to the McAlpine Creek WWMF (if applicable).
BOD and TSS concentrations remained relatively constant over the time period, but loads increased
as the influent flow increased. Influent TN and ammonia concentration and loads increased over the
time period, while TP concentrations and loads decreased. The reduction in influent TP is likely due
to reduced phosphorus in the solids sidestream upon completion of the gravity belt thickening
facility.
A summary of the annual average concentrations and loads for each parameter for 2004 and 2013
are shown in Table 4-1 and 4-2 below. Flow presented in Table 4-1 for 2013 is a summation of
effluent flow and diversion flow. The tables also show the percent change in concentration and load
from 2004 to 2013 values. From 2004 to 2013 BOD and TSS concentrations reduced slightly, but
the loads have doubled due to the increase in influent flow. Over the same time period influent TN
concentrations have increased by almost 20%, and influent load has almost tripled. The increase in
nitrogen load at a higher rate than BOD loads may have a significant impact on carbon availability
for biological phosphorus and nitrogen removals.
Table 4-1: Annual Avera•e Flow and Concentration 2004 and 2013 Corn•arison
Parameter 2004 Annual Average 2013 Annual Average % Change from
2004-2013
Flow, mgd 1.88 4.09 118%
BOD, mg/L 247 228 (8%)
TSS, mg/L 350 301 (14%)
TN, mg/L 38.9 46.13 19%
NH3-N, mg/L 24.6 32.1 30%
TP, mg/L 7.8 6.5 (23%)
Table 4-2: Annual Avera•e Flow and Loads 2004 and 2013 Corn•arison
Parameter 2004 Annual Average 2013 Annual Average Change from 2004-
2013
Flow,mgd 1.88 4.09 118%
BOD, Ib/d 3,787 7,804 _ 106%
TSS, Ib/d 5,456 10,433 91
TN, Ib/d 586 1,604 173%
NH3-N, Ib/d 363 1,161 220%
TP, Ib/d 119 235 97%
Twelve Mile Creek Facilities Planning Report 4-5 AND Lxi11 SAWYER
February 2015 HAZEN
Environmental Engineers& Scientists

ƒ g 0 -0 o 0_ 2. $ =
0 = E ® G 3.
\ \ 0 k 3 m = _
£
§ 2 ) o 0
/ Concentration (m%)
�
Ul al CD ƒ \ / 0 I §
1,4.1 CZa 0) w CO J ] 0 / @ 3
\ o 0 0 0 0 0 0 0 0 0 0 = _ m Cl) —I 0
\ Jim �. ---- :. . �, � $ � 2 = . & ƒ J
_. n- a_
\ Dec-03 % 7 / 0 0 . § ƒ 7
Jul-04 ° 2 ® d ' £ -
? 9 s ° _ ] £ ƒ
Dec-04 _ — 7 0 0 CD 0 J a
\ .. . . I . -c ƒ • a_ ¥ 0
Ju 0 •
\ ■ \ ° q 0 o a) §
Jan-06 • E m J e A c zf §ki$§- E � \ / $- CD•�>0 a m CD 0 . 0 3
uuloZ- O - % ƒ o \ /
o c % 7 m o a \ m
° Jan-08 = J \ \ = ® o k
6
kpga . CO c d $ = °
O £ > . / a) y
�mm ] / # - ®_ k 0_ =
Jul - a.
% 9 7 o = -0
min - . 2 \ / / ,_ ƒ 0
Judo - s $ » ® 5. k
n 2 0 ± m =
Gmg � \ 2 ° m- 0 7 /
lmJ� � J k § m CD
co$ CD § $ 7 \ / CD
m!2- J m = m = m E
} Ju 12- ( \ C g / 0
�>g� . ƒ § \ \ / 9
\ -:75 0 r - °
Jul-13 0 7 o m 2
�W ¥ = CO 0
CI_
»
2.i \ < i1.
CO !
00 q0
\
.CD 0 0 a

CP
9)I1 ok&
Figure 4-8: Historical Effluent TN and NH3 Concentrations
Effluent TN -4.--Effluent NH3
35
30
_25
J
E
"20
c
0
t15
U
c 1
5 \\„..,..,....„...,__, „................L..„ .
cep A ,,,,,
0, , , . , , , ,. . , ,r , , , , , , v ,_,
t'7 to tD ry ti cn oD tT OS O O r e- N N c+s M
45 - $ 4 R . 4 B 4 5 C = c � c � C = c
Figure 4-9: Historical Effluent TP Concentration
— Effluent TP
6
5 1
24 I
Ifn
c 1 0
23 t 1
C
cu
I\ I
I
el
1 1\4 -I\ II I Lk?i
A \ I \1/4„..,A.A.....k...A4.0..,XANt .
t� t�S tf N 9 h 880 0 ..- �- N {V M In
z c5 5 �+ 5 c 5 c z c = c = c m c =2. c = c
Twelve Mile Creek Facilities Planning Report 4-7 ui�snt►T AND
[ri[x
February 2015 HAH HI,L Sy1'1 I EIi
Environmental Engineers & Scientists

9r1.0 Pp`
With exception to an upset event in 2005 where the facility fully lost nitrification, and the 2006 event
when the facility was unable to control effluent total TP, the Twelve Mile Creek WWTP has had
relatively consistent effluent quality over the past 10 years. Effluent BOD and TSS rarely have
excursions over 20 mg/L and TSS has not exceed the monthly average of 30 mg/L since 2005. In
July 2013 the effluent BOD and TSS concentrations begin to increase, which may be due to
reduced solids capture in the effluent filters. Effluent TN varies between 5 and 10 mg/L for the
majority of the time period, while effluent ammonia typically remains below 1.0 mg/L. In November
2013 the minimum reported effluent ammonia concentration decreased from 1.0 mg/L to 0.1 mg/L,
resulting in a lower average concentration the last two months of 2013. Effluent TP has improved
significantly since 2008, when recommendations made in the PROS were placed in service
including new sodium aluminate storage and feed facilities and sludge thickening.
The Twelve Mile Creek WWTP typically operates at a MLSS concentration between 3,000 and
5,000 mg/L. The average MLSS over the ten year period evaluated was approximately 4,050 mg/L.
Solids are wasted approximately 16-18 hours per day, averaging about 105,000 gpd. Historical
aerobic SRT from 2004 - 2012 was 16.3 days, but for the past five years, the aerobic SRT has
averaged 12.0 days. Prior to the current period, operational staff had trouble controlling the SRT due
to clarifier RAS well seal failure and insufficient solids storage capacity. The historical SVI was also
evaluated. Table 4-3 presents the historical 50, 90 and 99-percentile SVI values.
Table 4-3: Historical SVI Percentile Values
Percentile SVI (mL/g)
50th-percentile 100
90th-percentile 176
99th-percentile 222
4.3 Basis of Design
Based on the historical data, design concentrations and peaking factors were developed and are
summarized in Table 4-4 below. For comparison purposes, the values from the PROS are also
presented. Rationale for the design concentrations are as follows:
• BOD concentration has been stable the past 10 years.The maximum yearly annual average
(AA) BOD concentration from 2004 - 2012 was used (275 mg/L in 2008).
• TSS concentration has been stable the past 10 years. The maximum yearly AA TSS
concentration from 2005 - 2011 was used in mg/L(295 2007). 2004 and 2012 TSS
concentrations are very high, and appear to be outliers.
• TN and NH3 concentration have increased substantially in the last 10 years.A conservative
design value based on the increasing concentration was chosen based on 2012
concentrations (TN = 55 mg/L and NH3 = 35 mg/L).
Twelve Mile Creek Facilities Planning Report 4-8 jT�m,�T AND `��
February 2015 j]H[lj�l� SAWYER
ER
Environmental Engineers& Scientists

•
• TP concentrations decreased the last 10 years due in part to reduced TP loadings from
solids processing recycle streams. The annual average concentration from 2004-2012 was
used (7.0 mg/L).
Table 4-4: Desi•n Concentrations -2006 Re•ort vs. 2014 Re•ort
2006 P-Optimization 2014 Design
Parameter Report Concentrations
Annual Average Annual Average
BOD, m•/L 237 275
279 295
MIMEN 40.4 55
• 25.5 35
TP, mi/L y 7.6 7.0
Influent design concentrations for all parameters increased from the 2006 Report,with the exception
of phosphorus. The average temperature during the seven years evaluated was 19.7°C, and the
minimum and maximum month temperatures were 11.9°C and 25.2°C, respectively. Design peaking
factors based on historical data are presented in Table 4-5. Design concentrations and loads for
annual average and maximum month conditions for 7.5 mgd, 9.0 mgd, and 12.0 mgd expansions
are presented in Table 4-6, Table 4-7, and Table 4-8 respectively.
•
Table 4-5: Desi•n Peakin• Factors
Parameter Min Day Max Month Max Week Max Day
Flow, mgd 0.53 1.20 1.47 2.20
BOD, mg/L 0.27 1.35 2.00 3.00
TSS, mg/L 0.20 1.42 2.00 3.00
TKN, mg/L 0.24 1.16 1.33 2.00
NH3-N, mg/L 0.24 1.16 1.33 2.00
TP, mg/L 0.41 1.18 1.34 2.01
Table 4-6: Desi•n Concentrations & Loads - 7.5 m•d
Annual Average Maximum Month
Parameter Conc. (mg/L) Load (Ib/d) Conc. (mg/L) Load (Ib/d)
Flow, mgd 6.3 7.5
BOD _ 275 14,450 309 19,330
TSS 295 15,500 349 21,830
TKN 55 2,890 53 3,320
•
NH3-N 35 1,840 33 2,060
TP 7.0 370 6.9 430
Twelve Mile Creek Facilities Planning Report 4-9 �JtiL�lil\ 12`]V11L1[
February 2015AND
Environmental Engineers 3 Scientists

( 0 ..
Table 4-7: Desi•n Concentrations & Loads — 9.0 m•d
Annual Average Maximum Month
Parameter Conc. (mg/L) Load (Ib/d) Conc. (mg/L) Load (Ib/d)
Flow, mgd 7.5 9.0
BOD 275 17,140 309 23,190
TSS 310 18,450 349 26,200
TKN 55 3,440 53 3,980
NH3-N 35 2,190 33 2,477
TP 7.0 440 6.9 520
Table 4-8: Desi•n Concentrations & Loads — 12.0 m•d
Annual Average Maximum Month
Parameter Conc. (mg/L) Load (Ib/d) Conc. (mg/L) Load (Ib/d)
Flow, mgd 10.0 12.0
BOD 275 22,940 309 30,920
TSS 310 24,600 349 34,930
TKN 55 4,590 53 5,300
NH3-N 35 2,920 33 3,300
TP 7.0 580 6.9 690
4.4 BioWin Modeling 1
4.4.1 Supplemental Sampling
Supplemental Wastewater Characterization
Supplemental sampling was performed at the Twelve Mile Creek WWTP from December 11th,
through December 19th, 2013. Twenty-four hour composite samples of raw influent without recycles
and secondary effluent were taken daily during this period, and a nutrient profile through the process
was performed on December 16th and December 17th. The results of the composite samples taken
at each location are summarized in Appendix D.
The raw influent sample was taken at the grit tank, upstream of the sidestream return. Influent
concentrations and fractions from special sampling are similar to those observed at other municipal
treatment plants and are thought to be representative of the current influent characteristics of the
facility
Process Profiles
Nutrient, pH and dissolved oxygen (DO) profiles were performed through the secondary treatment
process. Nutrient and pH profiles were taken through each oxidation ditch in the morning and
afternoon of December 16th and December 17th. DO profiles were also performed at those times.
Results of the profiles are presented in Appendix D.
Complete nitrification was not achieved in Oxidation Ditch No. 2 on the afternoon profiles on
December 16th and December 17th. Sufficient DO was present in the aerobic zone of Oxidation Ditch
Twelve Mile Creek Facilities Planning Report 4-10 MEN
February 2015 ME WY 1 {
Environmental Engineers 6 Scientists

OA CO,
ot-
* Q r
20,} ¢
j.H.CAPO.
No. 2, so the high ammonia concentrations leaving Ditch No. 2 may be attributed to uneven flow and
load distribution to each train and/or diurnal fluctuations in load.
4.4.2 Process Modeling and Evaluation
Computer modeling of the biological system using BioWin Mil software was used in order to assess
the capacity of the existing oxidation ditches and identify upgrades necessary for the 7.5, 9.0, and
12.0 mgd expansion alternatives.
Model Calibration
A model of the Twelve Mile Creek WWTP was developed for the PROS. This model was used and
re-calibrated based on recent historical data and the results of the supplemental sampling that took
place in December of 2013. Figure 4-10 presents the BioWin model used in the calibration.
Figure 4-10: BioWin TM Calibration Model —Twelve Mile Creek WWTP
Sodium aluminate
Effluen``
Plant Influent Anaerobic Anoxic OX 2 OX 3 OX 4 OX 5
1
oxt ox7 oxs
T $ludgu
Influent wastewater was characterized based on the historical data and supplemental sampling.
Influent fractions used in the BioWin model are summarized in Table 4-9,and compared to the 2006
values. The fraction of readily biodegradable COD appears to have decreased significantly since
2006. The readily biodegradable COD fraction may have decreased due to reduced collection
systems residence time associated with the increase in flows over the past 10 years. Reduced
collection system residence times limit the amount of complex organics that are broken down into
simpler, more readily biodegradable COD.
Twelve Mile Creek Facilities Planning Report 4-11 TT�� /'m �
February 2015 HAZE'T AND SAWYER
Environmental Engineers& Scientists

J, co&4,
CP
9& Q
Table 4-9: Twelve Mile Creek WWTP Influent Fractions
Constituent BioWin Default 2006 Fractions 2014 Fractions
Fbs- Readily Biodegradable COD 0.16 0.22 0.12
Fxsp - Slowly Biodegradable COD 0.75 0.78 0.82
Fus - Soluble Unbiodegradable COD 0.05 0.10 0.05
Fup - Particulate Unbiodegradable COD 0.13 0.22 0.22
Fna - Ammonia:TKN Ratio 0.66 0.66 0.63
Fnox— Particulate Fraction of Organic 0.50 0.50 0.56
Nitrogen
Fnus - Soluble Unbiodegradable TKN 0.02 0.02 0.02
Fpo4 - Phosphate:TP Ratio 0.50 0.60 0.49
The model was calibrated based on running steady state and dynamic simulations. Dynamic
simulations were performed for the months of March 2012 through October 2013. Figure 4-11
shows that the BioWin predicted MLSS concentrations match well compared to the historical MLSS
concentrations during most periods. The model predicted full nitrification with transient ammonia
spikes, presented in Figure 4-12, and accurately predicted inconsistences in phosphorus removal,
shown in Figure 4-13.
Figure 4-11: Modeled vs. Historical MLSS Concentration
—Modeled MLSS • Historical MLSS
5,000
.
4,500
4,000 , • �" •N,�:. •
+
St
3,500 • . .
• •
5 • •
• • •_r••• •
m 3,000 - - .— -----; ..
2,500 •. ••.
• • ....S.v) 2,000
Cl)
—J
M 1,500
1,000
500
I 0
N N N N N M CO c') M CO M
. ?. — KS. > C T a >
In Z ') 2 3 co Z
Twelve Mile Creek Facilities Planning Report 4-12 HAZE
. m
February 2015 HAZE'j�AD
Environmental Engineers & Scientists

6 0°
Figure 4-12: Modeled vs. Historical Effluent NH3 Concentration
—Modeled NH3-N • Historical NH3-N
6
.•
5
W
z
' 4
5
i
3
ci .
1U4LLLJ1ML*4k4WLJ
1 I. 1 -
0
N N N N N el in n cn to n
z ", 2 2 -, cn z
Figure 4-13: Modeled vs. Historical Effluent TP Concentration
—Modeled TP • Historical TP
6
5
n.
g
o 4
o i
E 3 li 0
N
7
b
. 2 - --r— li .
.•
1
1 , , ILA .
...LilAti._1 • I.1. i \ , •°1
N tV N N N 2J(1
g -3 in 2
Twelve Mile Creek Facilities Planning Report 4-13 ilHlE1\AND `�_,�„,
YER
February 2015 �1
Environmental Engineers& Scientists

tN —COG•,
c
2p.c CPP y?
Process Evaluation
The calibrated model was initially used to analyze expansion alternatives for the 9.0 mgd expansion
phase. The two expansion alternatives modeled included 1) adding two new FAO basins, and 2)
converting the four existing FAO basins to plug flow diffused aeration. Detailed results from these
models are presented in Section 4.4.3. In order to defer capital costs, an interim capacity of 7.5
mgd was developed, and results from the 7.5 mgd expansion are presented in Section 4.4.4.
In order to convert the FAO basins to plug flow diffused aeration one FAO basin would need to be
out of service. The capacity of the facility with one basin out of service was modeled in order to
determine the timeframe in which upgrades would need to be performed. Results from these models
are presented in Sections 4.4.5. In addition to expansion alternatives, the model was used to
evaluate the return gate position in the current FAO basins in order to optimize denitrification and
promote more reliable biological phosphorus removal in the near-term (presented in Section 4.4.6).
Table 4-10 summarizes the annual average and maximum month influent concentrations and
temperature used in the modeling and analysis. Annual average concentrations were used in order
to simulate typical operating conditions for the facility under normal conditions. Maximum month
concentrations were used in order to evaluate the capacity of the facility and performance of each
expansion alternative.
Table 4-10: Modeled Annual Average and Maximum Month Concentrations at 9.0 mgd
Desi•n
Constituent Annual Maximum
Average Month
Flow, mgd 7.5 9.0
Temperature, °C 20 12
BOD5, mg/L 275 309
TSS, mg/L 310 349
TKN, mg/L 55 53
NH3-N, mg/L 35 33
TP, mg/L 7.0 6.9
PO4-P, mg/L 3.5 3.5
4.4.3 9.0 mgd Expansion Evaluation
Two alternatives were modeled for the 9.0 mgd expansion of the biological process:
1. Two (2) new FAO basins, for a total of six (6) FAO basins
2. Convert all four (4) FAO basins to plug flow diffused aeration
Both scenarios were simulated in BioWin under annual average and maximum month conditions.
Results are presented in Table 4-11. BioWin modeling shows that at both annual average and
maximum month conditions both alternatives operate at similar MLSS concentrations and have
similar effluent quality.
Twelve Mile Creek Facilities Planning Report 4-14 TT�,m�T AND
(r�`I
February 2015 HAH AND SkW i'.R
Environmental Engineers & Scientists

\O1�cOG4j
x
♦ M a
c
q j:HxC APO`%
Table 4-11 - BioWin Results - 9.0 m•d Expansion Evaluation
FAO Basins Diffused Aeration Basins
Parameter Annual Maximum Annual Maximum
Average Month Average Month
Flow, mgd 7.5 9.0 7.5 9.0
Basins in Service 6 6 4 4
MLSS, mg/L 3,000 4,600 2,800 4,300
Aerobic SRT, days 10 12 6 7
Temperature, °C 20 12 20 12
Sodium Aluminate Dose, gpd 100 100 30 30
Effluent NH3, mg/L 0.7 1.6 0.2 1.2
Effluent NOx, mg/L 9.0 7.1 9.0 6.8
Effluent TN, mg/L 12.2 11.3 11.7 10.6
Effluent TP, mg/L < 0.2 < 0.2 < 0.2 < 0.2
4.4.4 7.5 mgd Expansion Alternative
The model was run at 7.5 mgd to observe the anticipated MLSS concentrations and effluent quality
for annual average and maximum month conditions for the anticipated initial plant expansion to 7.5
mgd rated capacity. Results from these model runs are presented in Table 4-12 below.
Table 4-12: BioWin Results-7.5 m•d Ex•ansion Evaluation
FAO Basins Diffused Aeration Basins
Parameter Annual Maximum Annual Maximum
Average Month Average Month
Flow, mgd 6.3 7.5 6.3 7.5
Basins in Service 6 6 4 4
MLSS, mg/L 2.500 3.800 2,300 3,600
Aerobic SRT, days 10 12 6 7
•
Temperature, °C 20 12 20 12
Sodium Aluminate Dose, gpd 60 60 10 10
Effluent NH3, mg/L 0.6 1.2 0.2 1.2
Effluent NOx, mg/L 9.3 8.2 8.6 6.8
Effluent TN, mg/L 12.4 11.9 11.4 10.6
Effluent TP, mg/L < 0.2 < 0.2 < 0.2 < 0.2
4.4.5 Capacity of Three FAO Basins
The capacity of three FAO basins in service was modeled in order to evaluate when it is necessary
to begin the conversion of the FAO basins to diffused aeration.As shown in Table 4-13, operation of
three FAO basins at a flow of 4.5 mgd under maximum month load, minimum temperature
conditions may result in operation at elevated MLSS concentrations.With current flows approaching
3.3 mgd, it is recommended that the conversion of the basins begin as soon as possible in order to
limit the potential for effluent excursions.
Twelve Mile Creek Facilities Planning Report 4-15 HAM „m "_„�,
February 2015 AND LAYER
Environmental Engineers & Scientists

mr04,
1/21
qTH;.c Aapy
Table 4-13: BioWin Results — Capacity of Three FAO Basins
Parameter Maximum Month
Flow, mgd 4.5
Basins in Service 3
MLSS, mg/L 4,650
Aerobic SRT, days 12
Temperature, °C 12
Effluent NH3, mg/L 1.2
Effluent NOx, mg/L 5.7
Effluent TN, mg/L 9.5
Effluent TP, mg/L 0.2
4.4.6 Return Gate Evaluation
An evaluation was performed to determine the optimal return gate position to optimize denitrification
in the anoxic zone of the current FAO basins. BioWin models were run at different gate positions
between 0% and 100%, and nitrate concentrations leaving the anoxic zone and secondary clarifier
effluent were recorded. Results of these model runs are shown in Figure 4-14.
Based on the BioWin model runs, the optimal gate position is between 40% and 60% open. This is
the optimal position for denitrification in the anoxic zone, with minimal nitrate bleed through into the
aerobic zone. Minimizing nitrate in the secondary clarifier effluent also improves biological
phosphorus removal in the anaerobic zone, reducing the amount of nitrate that is returned to the
zone via the RAS recycle. This will reduce the amount of chemical necessary at Twelve Mile Creek
WWTP to meet stringent effluent TP limits. It is recommended that the gate position be adjusted,
and anoxic zone effluent nitrate be monitored on a regular basis to optimize anoxic zone effluent
nitrate removal.
Twelve Mile Creek Facilities Planning Report 4-16 TT�„t,�T AND `I
February 2015 HAZE 1'1 I i'R
Environmental Engineers& Scientists

Figure 4-14: Recycle Gate Position and Effluent Nitrate Concentrations
Anoxic Zone Nitrate Secondary Effluent Nitrate
18
16
14 -- -
E
0 12
m
10 —
Optimal
U 8 Range
N
Z s
z 4
2
0
0% 20% 40% 60% 80(3/0 100%
Recycle Gate Position (% Open)
4.4.7 Summary
The process model previously developed for the PROS was updated and recalibrated based on
current historical data and December 2013 special sampling. This model was then run for various
scenarios in order to evaluate the most effective way to increase the capacity of the biological
system.
Process modeling indicates that converting the existing four FAO basins to plug flow diffused
aeration basins provides similar treatment capacity as building two more FAO basins (for a total of
six) at the 9.0 mgd design flow. Based on construction phasing, and the necessity to take at least
one basin out of service for upgrades, it is recommended that the conversion of the FAO basins to
plug flow diffused aeration be performed as soon as possible. In the interim, it is recommended that
the return gate be set between 40-60% open so that anoxic zone denitrification may be optimized.
Twelve Mile Creek Facilities Planning Report 4-17 lJt1LtG1\AND "A,�,�,�YE(
February 2015
Environmental Engineers 8 Scientists

10 - BUOYANCY CALCULATIONS
Union County FORM ATC-12-14
Twelve Mile Creek WRF Expansion Attachment for Section 3.H
NPDES No.NC0085359

Hazen Project Job Ref.
12-Mile Creek 9.0 MGD Upgrade 30831-061
Subject Sheet no./rev.
Hazen and Sawyer
9101 Southern Pine Boulevard Flotation Calculations 1
Suite 250 Calc.by Date
Charlotte,NC 28273 CSW 12/20/2022
IPS2 BUOYANCY CHECK
Flood Design
Design Flood =Structures designed for the 100-Year flood elevation (Base Flood Elevation)of 508.50.
The only structure that has any portion of it below the flood elevation is the new Influent Pump Station (IPS2). All other
structures are above the flood elevation and exempt from the flood design.
IPS 2 Buoyant Volume=47.17 ft*21.5 ft*3 ft+ (508.50 ft—471.50 ft)*45.17 ft* 19.50 ft
= 3042.5 ft3+ 32590 ft3
=35633 ft3
Upward Buoyant Force=35633 ft3*63 pcf=2245 Kips
Volume of Structural Concrete Elements(Volumetric measurments from Modeling):
=683 CY
Weight of Structural Concrete Elements
=683CY*27 ft3/CY* 150 lb/ft3
=2766 kips
Volume of Soil Over Foundation Lip
=[(47.17 ft*21.5 ft)—(45.17 ft* 19.50 ft)] *(510 ft—471.50 ft)
=133.33ft2*38.5ft= 5133ft3
Weight of Soil over Toe:
=5133 ft3* (120 ft3—63 ft3)
=293 kips
Total Uplift Resistance Force:
=293 kips+2766 kips
=3059 kips
FS against Uplift=3059 kips/2245 kips
=1.36
b >1.25
b OK
.> Structure flotation resistance is adequate

ATTACHMENT 3J
RESIDUALS MANAGEMENT PLAN

APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
SECTION 3.1 RESIDUALS MANAGEMENT PLAN
The Twelve Mile Creek WRF 9.0 mgd Expansion Project will continue the current operating strategy at
the plant to produce waste activated sludge (WAS). Table 1 below presents the design sludge
production rates.
Table 1—Design Sludge Production Rates at Monthly Maximum Average Design Flow (9 MGD)
Sludge Type Sludge Production Rate (lb/day)
Waste Activated Sludge 19,100
WAS can either be digested prior to dewatering or can also be directly dewatered, based on the Union
County Water (UCW) agreement with McGill Compost for solids removal and disposal.
Union County Water FORM ATC-12-14
Twelve Mile Creek Water Reclamation Facility Attachment for Section 3.J
NPDES No. NC0085359