NC0066028_Application ATC (066028A01)_20241118

APPLICATION FOR AUTHORIZATION TO CONSTRUCT
RECEIVED
NOV 18 2024
TOWN OF LANSING NCDEQ/DWR/NPDES
WASTEWATER TREATMENT PLANT PROJECT
UNC-CHAPEL HILL COLLABORATORY
INNOVATIVE HIGHLY TREATED WASTEWATER PILOT PROGRAM
COLLABORATORY PROJECT ID: collab_418(a)
ASHE COUNTY, NORTH CAROLINA
October 25, 2024
Prepared by:
Benjamin B. Thomas, PE
West Consultants, PLLC
405 South Sterling Street WEST
Morganton, North Carolina 28655
Phone: [phone] CONSULTANTS P«c
Fax: [phone]
[e-mail]
North Carolina License No. P-0210

LSJNG
Town of Lansing
Town Hall 173 B Street"'PO Box 266 Lansing,NC 28643"'336.384.3938"'www.lansingnc.us
Board of Aldermen: Jim Blevins,Matt Cordell,Anita Greenwood,Tom Richardson,Teresa McCoy
Finance Officer: Elizabeth Johnson
Mack Powers,Mayor Sandra Roten,Town Clerk
November 14,2024
RECEIVED
Ori Tuvia, Engineer III
NCDEQ—Division of Water Resources-NPDES NO V 18 2024
512 N. Salisbury Street, 9th Floor
Raleigh,NC 27604 NCDEQ/DWR/NPDES
RE: Town of Lansing WWTP Project
Collaboratory Project ID: collab_418(a)
Request for Authorization to Construct
Dear Mr. Tuvia:
The Town of Lansing is requesting authorization to construct (ATC) a new wastewater treatment plant
(WWTP)to replace the existing WWTP.In support of this request,we offer the following information and
enclosed items:
NPDES Permit:
NC0066028
Project Description:
The existing WWTP is over 30 years old and is in a floodplain. A new WWTP will be constructed
above the 100-year flood elevation.The new WWTP will include an activated sludge package plant
consisting of dual influent screens,common flow equalization(surge)tank,a common anoxic tank,
dual aeration tanks, dual clarifiers, and common sludge holding tank(SHT). The effluent from the
package plant will be further treated by a cloth drum filter and by ultraviolet disinfection (with a
chlorine tablet backup system). A new influent pump station and new effluent measurement and
sampling will also be included. The new WWTP has been designed to achieve a highly treated
effluent quality in accordance with Section 8.26(a)of S.L.2021-180.However,we understand that
the NPDES effluent limits will not be affected by S.L. 2021-180. The design capacity of the new
WWTP is 0.050 MGD,but at this time we are not requesting to discharge more than 0.015 MGD.

Ori Tuvia,Engineer III
November 14,2024
Page 2
Construction Timeline:
Start Construction March 1,2025
Complete Construction July 24,2026
ARPA Funding:
This project is being fully funded by the UNC Collaboratory using American Rescue Plan Act
funds via the NC General Assembly appropriations under S.L.2021-180,as amended by S.L.2022-
11.The project number is collab 418(a).
Items included in this Application Package:
1. Check payable to NCDEQ for$1,000
2.Application Form ATC 10-23
3.Plans and Specifications
4.NPDES permit(Part I)
5.Engineering Calculations(includes schematic and hydraulic profile)
6.Residuals Management Plan
Thank you for your assistance with this important project. Please contact the project engineer with any
requests for information:
Benjamin B.Thomas,PE
828 522-4728
[e-mail]
Sincerely,
Mack Powers,Mayor
Enclosures
cc: Landon Davidson,NCDEQ via email [e-mail]
Hope Thomson,UNC-EFC via email [e-mail]
Benjamin B.Thomas,West Consultants,PLLC
Nicole Johnston,Burch Environmental via email [e-mail]

r
APPLICATION FORM
AUTHORIZATION TO
CONSTRUCT
& FEE COPY
PLANS & SPECIFICATIONS
(BOUND SEPARATELY)
umminiiiimirni
• NPDES PERMIT
(PART 1 )
ENGINEERING
4 CALCULATIONS
•
L.,,, II
RESIDUALS
MANAGEMENT PLAN

1i

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
SECTION 1: INSTRUCTIONS AND INFORMATION
A. The Division of Water Resources will accept this application package for review only if all of the items are provided and the
application is complete.Failure to submit all of the required items will result in the application package being returned as incomplete
per 15A NCAC 02T.0105(b).
B. A check or money order must be submitted in the amount of$1000.00 (except minor modifications) dated within 90 days of
application submittal and made payable to North Carolina Department of Environmental Quality(NCDEQ).
C. Plans and specifications must be prepared in accordance with 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina General
Statute 133-3,North Carolina General Statute 143-215.1,and Division of Water Resources Minimum Design Criteria for NPDES
Wastewater Treatment Facilities.
D. The plans and specifications submitted must represent a completed final design that is ready to advertise for bid.
E. Any content changes made to this Form ATC 10-23 shall result in the application package being returned.
F. The Applicant shall submit ONE ORIGINAL and ONE DIGITAL COPY (CD) of the application, all supporting documentation
and attachments. All information must be submitted bound or in a 3-ring binder, with a Section tab for each Section, except the
Engineering Plans.
G. Check the boxes below to indicate that the information is provided and the requirements are met.
H. If attachments are necessary for clarity or due to space limitations,such attachments are considered part of the application package
and must be numbered to correspond to the item referenced.
I. For any project that requires review under the State Environmental Policy Act(SEPA), an Authorization to Construct cannot be
issued prior to the completion of a State Clearinghouse advertisement period for a FONSI,EIS, etc.unless the project qualifies for
a Determination of Minor Construction Activity or the funding entity specifies that this requirement does not apply.
. For more information,visit the Division of Water Resources web site at:http://portal.ncdenr.org/web/wq/swp/ps/npdes.
In addition to this Authorization to Construct,the Applicant should be aware that other permits may be required from other Sections
of the Division of Water Resources(for example:reclaimed water facilities permits;Class A or B biosolids residuals permit).
SECTION 2: APPLICANT INFORMATION AND PROJECT DESCRIPTION
A. APPLICANT
Applicant's name Town of Lansing
Signature authority's name per 15A NCAC 02T.0106(b) Mack Powers
Signature authority's title Mayor
Complete mailing address PO Box 67,Lansing,NC 28640-0067
Telephone number [phone]
Email address [e-mail]
B. PROFESSIONAL ENGINEER
Professional Engineer's name Benjamin B.Thomas
Professional Engineer's title Principal
North Carolina Professional Engineer's License No. 20757
Firm name West Consultants,PLLC
Firm License number P-0210
Complete mailing address 405 S. Sterling St.,Morganton,NC 28655
Telephone number [phone]
Email address [e-mail]
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 1

State of North Carolina
DW RDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
C. NPDES PERMIT
NPDES Permit number NC0066028
Current Permitted flow(MGD)—include permit Phase 1: 0.015
flow phases if applicable Phase 2: 0.050
D. PROJECT DESCRIPTION
Provide a brief description of the project: The existing WWTP is over 30 years old and is in a floodplain.A new WWTP will be
constructed above the 100-year flood elevation. The new WWTP will be an activated sludge package plant including influent
screens,aeration basins,secondary clarifiers.anoxic zone,sludge storage,and flow equalization. The effluent from the package
plant will be further treated by a cloth drum filter and by ultraviolet disinfection(with a chlorine tablet backup system).A new
influent pump station and new effluent measurement and sampling will also be included.
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.
El If the project is funded by American Rescue Plan Act(ARPA)funds, please include the ARPA project number in the cover
letter and here Collaboratory Project ID: collab 418(a).
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
O If the facility is subject to any Special Orders by Consent(SOC),submit the applicable SOC.
® Not Applicable.
D. Finding of No Significant Impact or Record of Decision
O Submit a copy of the Finding of No Significant Impact or Record of Decision for this project.
O 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.
Engineering Plans
® Per 15A NCAC 02T.0504(c)(1),submit one set of detailed plans that have been signed,sealed and dated by a North Carolina
Licensed Professional Engineer.
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 2

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
• Per 21 NCAC 56 .1103(a)(6),the name, address and License number of the Licensee's firm shall be included on each sheet of
the engineering drawings.
® Plans must be labeled as follows: FINAL DRAWING—FOR REVIEW PURPOSES ONLY—NOT RELEASED FOR
CONSTRUCTION.
® 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
El Structural ❑Not Applicable
® Electrical (Pc»k.s 0 Not Applicable
® Instrumentation/Controls ❑Not Applicable
® Architectural ❑Not Applicable
El Building Mechanical co.t.j,NA1 Not Applicable
® Building Plumbing(r Jj ) ❑Not Applicable
El Plan and profile views and associated details of all modified treatment units including piping, valves, and equipment(pumps,
blowers,mixers,diffusers, etc.)
® 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. El 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
El Structural ❑Not Applicable
® Electrical (et»A 41^1 0 Not Applicable
® Instrumentation/Controls 0 Not Applicable
CO Architectural ❑Not Applicable
® Building Mechanical C0t4,1,5p Not Applicable
® Building Plumbing(,A`,41,s\ ❑ Not Applicable
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 3

State of North Carolina
DWRDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
® Detailed specifications for all treatment units and processes including piping, valves, equipment (pumps, blowers, mixers,
diffusers,etc.), and instrumentation.
O 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
O 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: Sheet 2
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 North
Carolina Licensed Professional Engineer;the seal,signature and date shall be placed on the cover sheet of the calculations.
For new or expanding facilities and for treatment process modifications that are included in Section 4.C, the calculations
shall include at a minimum:
® Demonstration of how peak hour design flow was determined with a justification of the selected peaking factor.
O 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.
O Hydraulic loading for each treatment unit.
O Sizing criteria for each treatment unit and associated equipment(blowers,mixers,pumps,etc.)
O Total dynamic head(TDH)calculations and system curve analysis for each pump specified that is included in Section 4.C.6.
O Buoyancy calculations for all below grade structures.
El Supporting documentation that the specified auxiliary power source is capable of powering all essential treatment units.
I. Permits
O 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 t/
Soil Erosion and Sediment Control 1/
USCOE /Section 404 Permit V
Water Ouality Certification (401) t/
USCOE/Section 10
Stormwater Management Plan ✓
CAMA
NCDOT Encroachment Agreement
Railroad Encroachment Agreement ✓
Other: ✓
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 4

State of North Carolina
D
RDepartment of Environmental Quality
." =� Division of Water Resources
Division of Water Resources APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
J. Residuals Management Plan
® For all new facilities,expanding facilities,or modifications that result in a change to sludge production and/or sludge processes,
provide a Residuals Management Plan meeting the requirements of 15A NCAC 02T.0504(j)and.0508;the Plan must include:
® A detailed explanation as to how the generated residuals (including trash, sediment and grit)will be collected, handled,
processed,stored,treated,and disposed.
® An evaluation of the treatment facility's residuals storage requirements based upon the maximum anticipated residuals
production rate and ability to remove residuals.
® A permit for residuals utilization or a written commitment to the Applicant from a Permittee of a Department approved
residuals disposal/utilization program that has adequate permitted capacity to accept the residuals or has submitted a
residuals/utilization program application.
® If oil,grease, grit or screenings removal and collection is a designated unit process, a detailed explanation as to how the
oil/grease will be collected,handled,processed,stored and disposed.
0 Not Applicable.
SECTION 4: PROJECT INFORMATION
A. WASTEWATER TREATMENT PLANT FLOW INFORMATION—COMPLETE FOR NEW OR
EXPANDING FACILITIES
1. Provide the following flow information:
Plant Flows
Existing Plant Design 0.015 MGD
Current NPDES Permit Limit 0.015/0.050 MGD
Current Annual Average
(past 12 months) 0.008 MGD
For Past 12 Months: For Past 24 Months:
Start Date:01/23 Start Date: 01/22
End Date: 12/23 End Date: 12/23
Maximum Month 0.009 MGD 0.014 MGD
Maximum Day 0.015 MGD 0.020 MGD
Peak Hour unknown MGD unknown MGD
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 5

State of North Carolina
DWR Department of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
B. WASTEWATER TREATMENT FACILITY DESIGN INFORMATION—COMPLETE FOR NEW OR
EXPANDING FACILITIES AND FOR TREATMENT PROCESS MODIFICATIONS
1. Have all of the requirements of 15 NCAC 02H. 0100, 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
Influent Design Influent Design Influent
Concentration Concentration Load
-Current (Must be (Must be
Annual supported by supported by Design Effluent
Average(past Engineering Engineering Concentration and/or NPDES Permit Limits
12 months) if Calculations Calculations Load (monthly average)
Parameter Available [Section 3.H1) [Section 3.Hl)
Ammonia Nitrogen 10 mg/L Summer N/A mg/L Summer
(NH3 N) unknown mg/L 40 mg/L 16.7 lb/day
10 mg/L Winter N/A mg/L Winter
Biochemical 10 mg/L Summer 30 mg/L Summer
Oxygen Demand 361 mg/L 250 mg/L 104 lb/day
(BOD5) 10 mg/L Winter 30 mg/L Winter
Fecal Coliform 10 per 100 mL 200 per 100 mL
Nitrate+Nitrite
Nitrogen(NO3-N+ N/A mg/L N/A mg/L
NO2-N)
Total Kjeldahl unknown mg/L
Nitrogen
10 mg/L N/A mg/L
Total Nitrogen
4.2 lb/year N/A lb/year
5 mg/L N/A mg/L
Total Phosphorus unknown mg/L 8 mg/L 3.3 lb/day
2.1 lb/year N/A lb/year
Total Suspended 168 mg/L 250 mg/L 104 lb/day 10 mg/L 30 mg/L
Solids(TSS)
3. Based on the"Project Basis of Design"parameters listed above,will the proposed design allow the treatment facility to meet
the NPDES Permit Limits listed above?® Yes or❑No. If no,describe how and why the Permit Limits will not be met :
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 6

State of North Carolina
DWRDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
4. Per 15A NCAC 02T.0505(j),by-pass and overflow lines are prohibited. Is this condition met by the design?®Yes or❑
No If no,describe the treatment units bypassed,why this is necessary,and where the bypass discharges:
5. Per 15A NCAC 02T.0505(k),multiple pumps shall be provided wherever pumps are used.Is this condition met by the
design?®Yes or❑No. If no,provide an explanation:
6. Per 15A NCAC 02T.0505(1),power reliability shall be provided consisting of automatically activated standby power supply
onsite capable of powering all essential treatment units under design conditions,or dual power supply shall be provided per
15A NCAC 02H.0124(2)(a). Is this condition met by the design? ®Yes or❑No. If no,provide(as an attachment to
this Application)written approval from the Director that the facility:
➢ Has a private water supply that automatically shuts off during power failures and does not contain elevated water storage
tanks,and
➢ Has sufficient storage capacity that no potential for overflow exists,and
➢ Can tolerate septic wastewater due to prolonged detention.
7. Per 15A NCAC 02T.0505(o),a minimum of 30 days of residual storage shall be provided. Is this condition met by the
design? ®Yes or❑No. If no,explain the alternative design criteria proposed for this project in accordance 15A NCAC
02T.105(n):
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: The entinre facility will be surrounded by chain-link fence with locked gate.
9. Is the treatment facility located within the 100-year flood plain? ®Yes or 0 No. If yes,describe how the facility is
protected from the 100-year flood: The top of walls of treatment units will be 2'or higher above base flood elevation.
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 Units Type Size per Unit Reference Reference Provided.
(Yes or No)
Manual Bar Screen 1 bar rack 0.15 MGD at peak hourly flow 8 46 07 53 yes
Mechanical Bar 1 static screen 0.15 MGD at peak hourly flow 8 46 21 00 yes
Screen
Grit Removal 0 -- --MGD at peak hourly flow -- -- N/A
Flow Equalization 1 12,500 gallons 8 46 07 53 yes
Primary Clarifier 0 Circular --ft diameter;--ft side water __ __ N/A
depth
Primary Clarifier 0 Rectangular --square feet;--ft side water __ __ N/A
depth
Other -- -- -- -- -- N/A
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 7

State of North Carolina
DWR
Department of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
2. SECONDARY TREATMENT(BIOLOGICAL REACTORS AND CLARIFIERS)(i.e.,biological and chemical
processes to remove organics and nutrients) 1
No. of Plan Sheet Specification Calculations
Treatment Unit Units Type Size per Unit Reference Reference Provided?
(Yes or No)
Aerobic Zones/ completely,
Tanks 2 mixed 15,000 gallons 8 46 07 53 yes
Anoxic Zones/ I rectanguler 7,575 gallons 8 46 07 53 yes
Tanks
Anaerobic 0 -- --gallons -- -- --
Zones/Tanks
Sequencing Batch 0 --gallons -- -- --
Reactor(SBR)
Membrane 0 -- --gallons -- -- --
Bioreactor(MBR)
Secondary Circular -- ft diameter;--ft side water-- -- -- --
Clarifier depth
Secondary 2 Rectangular 150 square feet;N/A ft side 8 46 07 53 yes
Clarifier water depth
Other -- --
3. TERTIARY TREATMENT
No.of Plan Sheet Specification Calculations
Treatment Unit Units Type Size per Unit Reference Reference Provided?
,(Yes or No)
Tertiary Clarifier 0 Circular --ft diameter;-ft side water -- -- --
depth
Tertiary Clarifier 0 Rectangular "square feet;--ft side water -- -- --
depth
Tertiary Filter 1 rotary cloth N/A square feet 10 46 61 43 No
Tertiary Membrane 0 -- --square feet -- -- --
Filtration 1
Post-Treatment
Flow Equalization 0 -- --gallons -- -- --
Post-Aeration 0 -- --gallons -- -- --
Other 0 -- -- -- -- --
4. DISINFECTION
No. of Plan Sheet Specification Calculatios
Treatment Unit Units Type Size per Unit Reference Reference Provided?
(Yes or No)
100,000 gal/day per bank at
in series peak hourly flow;2 number of
Ultraviolet Light 2 (Parallel;in banks;36 number of 11 46 66 56 yes
sorica) lamps/bank
Chlorination 1 tablet(fps; 1,066 gallons of contact 12 46 36 53 yes
tom) tank/unit
Dechlorination 1 ttable ) 35 gallons of contact tank/unit 12 46 36 53 yes
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 8

State of North Carolina
DWRDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
5. RESIDUALS TREATMENT
No. of Plan Sheet Specification Calculations
Treatment Unit Units Type Size per Unit Reference Reference Provided?
(Yes or No)
Gravity Thickening 1 decanting 98 square feet; 10.5 ft side water 8 46 07 53 no
Tank depth
Mechanical
Thickening/ -- -- --dry lb/hour -- -- --
Dewatering
Aerobic Digestion -- -- --gallons -- -- --
Anaerobic -- --
Digestion
-- -- --gallons
Composting -- -- --dry lb/hour -- -- --
Drying -- -- --dry lb/hour -- -- -- 1
1 Other -- --
6. PUMP SYSTEMS(include influent, intermediate,effluent,major recycles,waste sludge,thickened waste sludge and plant
drain pumps)
Capacity
Location No. of Purpose Type of each Plan Sheet Specification
Pumps pump Reference Reference
GPM TDH
Influent 2 lift to head submersible 104 49 9 33 32 19
Equalization(surge) 2 reduce peak flows to submersible 90 15 8 46 07 53
reactors
7. MIXERS
No.of Power of Plan Sheet Specification
Location Mixers Purpose Type eac(h( MHP
Reference Reference
Anoxic Tank 2 mixing propeller 1.9 8 46 07 53
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 9

State of North Carolina
yr,
DDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
8. BLOWERS
No. of Capacity of Plan Sheet Specification
Location Blowers Purpose Type ea(hCBlower Reference Reference
Mechanical Building 2 aerobic reactors positive displacement 118 14 46 07 53
Mechanical Building 1 flow EQ(surge) positive displacement 54 14 46 07 53
Mechanical Buildling 1 sludge holding positive displacement 54 14 46 07 53
9. ODOR CONTROL
Location No. of Purpose Type Plan Sheet Specification
Units Reference Reference
—
none -- -- -- -- --
1. SETBACKS—COMPLETE FOR NEW WASTEWATER TREATMENT STRUCTURES
1. The minimum distance for each setback parameter to the wastewater treatment/storage units per 15A NCAC 02T.0506(b)are
as follows:
Minimum Distance Is Minimum Distance
Required from Nearest Requirement met by the
Setback Parameter Design?If"No",identify
Treatment/Storage Setback Waivers in Item D.2
Unit Below
Any habitable residence or place of assembly under separate 100 ft ® Yes ❑ No
ownership or not to be maintained as part of the project site
Any private or public water supply source 100 ft ® Yes ❑ No
Surface waters(streams—intermittent and perennial,perennial 50 ft ®Yes ❑ No
waterbodies,and wetlands)
Any well with exception of monitoring wells 100 ft ® Yes ❑No
Any property line 50 ft ®Yes ❑No
2. Have any setback waivers been obtained per 15A NCAC 02T .0506(d)? ❑ Yes or® No. If yes, have these waivers been
written,notarized and signed by all parties involved and recorded with the County Register of Deeds?❑Yes or❑No. If no,
provide an explanation:
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 10

State of North Carolina
DWRDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
SECTION 5: APPLICATION CERTIFICATION BY PROFESSIONAL ENGINEER
Professional Engineer's Certification per 15A NCAC 02T .0105:
I, Benjamin B.Thomas, attest that this application package for an Authorization to Construct
(Typed Name of Professional Engineer)
for the Town of Lansing WWTP Collaboratory Project ID Collab 418(a)
(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
forth Carolina, inclusion of these materials under my signature and seal signifies that I have reviewed the materials and
ave 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:
Att-
ctk CAR®';
SEAL (1
a 20757
(rr' 1
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC 10-23) Page 1 1

f
State of North Carolina
DWRDepartment of Environmental Quality
Division of Water Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT
FORM ATC 10-23
SECTION 6: APPLICATION CERTIFICATION BY APPLICANT
Applicant's Certification per 15A NCAC 02T.0106(b):
I,Mack Powers,Mayor,attest that this application package for an Authorization to Construct
(Typed Name of Signature Authority and Title)
for the Town of Lansing WWTP Collaboratory Project ID Collab 418(a)
(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 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.
understand that in accordance with General Statutes 143-215.6A and 143-215.6B any person who knowingly makes any
Ilse statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor,which
may include a fine not to exceed $10,000, as well as civil penalties up to$25,000 per violation.
Signature: 4 Date: A)0✓ / 7/ ZO 24
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 I 0-23) Page 12

DocuSign Envelope ID:CB9148FA-1E54-4268-B004-35B475692DFB
Permit NC0066028
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provision 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
Town of Lansing
is hereby authorized to discharge wastewater from a facility located at the
Lansing WWTP
3322 Teaberry Road, Lansing
Ashe County
to receiving waters designated as the Big Horse Creek in subbasin 05-07-02 of the New River Basin in
accordance with effluent limitations,monitoring requirements,and other conditions set forth in Parts I,
II, III and IV hereof.
This permit shall become effective November 1, 2021
This permit and authorization to discharge shall expire at midnight on March 31, 2026.
Signed this day September 16, 2021
r—DocuSigned by:
`---8328B44CE9EB4A1...
for S. Daniel Smith, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 9

DowSign Envelope ID:C89148FA-1 E54-4268-8004-35B475692DFB
Permit NC0066028
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility,whether for operation or discharge are hereby revoked,and as
of this issuance,any previously issued permit bearing this number is no longer effective. Therefore,the exclusive
authority to operate and discharge from this facility arises under the permit conditions,requirements,terms,and
provisions included herein.
Town of Lansing
is hereby authorized to:
1. continue operating an existing 0.015 MGD wastewater treatment facility utilizing the
components
• manual bar screen
• wet well with lifting pumps
• influent composite sampler
• aeration basin with air blowers
• clarifier
• tablet chlorinator
• chlorine contact chamber
• tablet dechlorinator
• effluent composite sampler
• effluent meter
• sludge aerobic digestor basin with dewatering pump,
these facilities located at the Lansing WWTP, 3322 Teaberry Road, Lansing,Ashe County, and
2. after notifying the Division's Winston-Salem Regional Office and the Division's Central Office
(to facilitate a site inspection, if warranted),30 days in advance of intent to discharge more than
0.015 MGD under flow Phase 2 of this permit,then
3. discharge from said treatment works via Outfall 001, at the location specified on the attached
map, into Big Horse Creek [10-2-21-{8.5)], a waterbody currently classified C; HQW waters
within hydrological unit 05-07-02 [HUC: 0505000101] of the New River Basin.
Page 2 of 9

DocuSign Envelope ID:CB9148FA-1E54-4268-B004-35B475692DFB
Permit NC0066028
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (0.015)
[15A NCAC 02B.0400 et seq., 15A NCAC 02B.0500 et seq.]
WWTP Biological Grade I WPCS[15A NCAC 08G .0302]
Beginning with the effective date of this permit and lasting until expansion above 0.015 MGD or permit
expiration, the Permittee is authorized to discharge treated domestic wastewater from Outfall 001. Such
discharges shall be limited, monitored, and reported 1 by the Permittee as specified below:
EFFLUENT EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location 2
Flow 50050 0.015 MGD Continuous Recording I or E
BOD,5-day,(20°C)3 C0310 30.0 mg/L 45.0 mg/L Weekly Grab I and E
Total Suspended Solids 3 C0530 30.0 mg/L 45.0 mg/L Weekly Grab I and E
pH standard units 00400 >6.0 and<9.0 s.u. Weekly Grab E
Fecal Coliform
(geometric mean) 31616 200/100 ml 400/100 ml Weekly Grab E
Total Residual Chlorine 4 50060 28 µg/L Weekly Grab E
Temperature(°C) 000/0 Weekly Grab E
NH3 as N(mg/L) C0610 2/Monthly Grab E
Total Nitrogen(mg/L) C0600 Semi-Annually Grab E
Total Phosphorus(mg/L) C0655 Semi-Annually Grab E
Footnotes:
1. Beginning on the effective date,the permittee shall submit discharge monitoring reports
electronically using the NC DWR's eDMR application system [see A. (3)].
2. 1=Influent;E=Effluent
3. The monthly average effluent BODS and Total Suspended Solids concentrations shall not
exceed 15%of the respective influent value(85%removal required).
4. The Division shall consider compliant all effluent TRC values reported below 50 µg/L.
However,the Permittee shall continue to record and submit all values reported by a North
Carolina-certified test methods(including field certified),even if these values fall below 50
Jam•
Condition: The Permittee shall discharge no floating solids or foam visible in other than trace amounts.
Page 3 of 9

DocuSign Envelope ID:CB9148FA-1 E54-4268-B004-35B4756920FB
Permit NC0066028
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (0.050)
(15A NCAC 02B.0400 et seq., I5A NCAC 02B.0500 et seq.]
WWTP Biological Grade II WPCS[15A NCAC 08G.0302]
During the period beginning with approval of a discharge greater than 0.015 MGD and lasting until
permit expiration,the Permittee is authorized to discharge treated domestic wastewater from Outfall
001. Such discharges shall be limited, monitored, and reported l by the Permittee as specified below:
EFFLUENT EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location 2
Flow 50050 0.050 MGD Continuous Recording I or E
BOD,5-day,(20°C)3 C0310 30.0 mg/L 45.0 mg/L Weekly Grab I and E
Total Suspended Solids 3 C0530 30.0 mg/L 45.0 mg/L Weekly Grab I and E
pH standard units 00400 >6.0 and<9.0 s.u. Weekly Grab E
Fecal Coliform 31616 200/100 nil 400/100 ml Weekly Grab E
(geometric mean)
Total Residual Chlorine 4 50060 28 µg/L Weekly Grab E
Temperature(°C) 00010 Weekly Grab E
NH3 as N(mg/L) C0610 2/Monthly Grab E
Total Nitrogen(mg/L) CO600 Semi Grab E
Annually
Total Phosphorus(mg/L) C0655 Semi- Grab E
Annually
Footnotes:
1. Beginning on the effective date,the permittee shall submit discharge monitoring reports
electronically using the NC DWR's eDMR application system[see A. (3)].
2. I=Influent;E=Effluent
3. The monthly average effluent BODS and Total Suspended Solids concentrations shall not
exceed 15%of the respective influent value(85%removal required).
4. The Division shall consider compliant all effluent TRC values reported below 50 pig/L.
However,the Permittee shall continue to record and submit all values reported by a North
Carolina-certified test methods(including field certified),even if these values fall below 50
µg/L.
Condition:The Permittee shall discharge no floating solids or foam visible in other than trace amounts.
Page 4 of 9

DocuSign Envelope ID:CB9148FA-1E54-426843004-35B475692DFB
Permit NC0066028
A. (3.) ELECTRONIC REPORTING OF MONITORING REPORTS
[NCGS 143-215.1 (b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program reports.
The final NPDES Electronic Reporting Rule was adopted and became effective on December 21,2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this permit
(Standard Conditions for NPDES Permits):
• Section B.(11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D.(6.) Records Retention
• Section E.(5.) Monitoring Reports
1. Reporting Requirements [Supersedes Section D.(2.)and Section E. (5.)(a)1
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eDMR)internet application.
Monitoring results obtained during the previous month(s)shall be summarized for each month and submitted
electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring data and
submit DMRs electronically using the internet. The eDMR system may be accessed at:
https://deq.nc.gov/about/divisions/water-resources/edmr.
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility being
physically located in an area where less than 10 percent of the households have broadband access, then a
temporary waiver from the NPDES electronic reporting requirements may be granted and discharge
monitoring data may be submitted on paper DMR forms (MR 1, 1.1, 2, 3) or alternative forms approved by
the Director. Duplicate signed copies shall be submitted to the following address:
NC DEQ/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
See"How to Request a Waiver from Electronic Reporting"section below.
Monitoring results obtained during the previous month(s) shall be summarized for each month and reported
via the eDMR system no later than the last calendar day of the month following the completed reporting
period. Regardless of the submission method,the first DMR is due on the last day of the month following the
issuance of the permit or in the case of a new facility, on the last day of the month following the
commencement of discharge.
Starting on December 21, 2025, the permittee must electronically report the following compliance
monitoring data and reports,when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act(CWA) Section 316(b)Annual Reports.
Page 5of9

DocuSign Envelope ID:CB9148FA-1E54-4268-6004-35B475692DFB
Permit NC0066028
The permittee may seek an electronic reporting waiver from the Division (see "How to Request a Waiver
from Electronic Reporting"section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the time of each
electronic submission. The permittee should use the EPA's website resources to identify the initial recipient
for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity(EPA or
the state authorized by EPA to implement the NPDES program) that is the designated entity for receiving
electronic NPDES data[see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each type of
electronic submission and for each state. Instructions on how to access and use the appropriate electronic
reporting tool will be available as well. Information on EPA's NPDES Electronic Reporting Rule is found at:
https://www.federalreaister.gov/documents/2015/10/22/2015-24954/national-pollutant-discharge-elimination-
system-npdes-electronic-reporting-nil e
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/edm1
4. Signatory Requirements (Supplements Section B. (11.) (b) and Supersedes Section B.(11.)(d)l
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/edtnr
Page 6 of 9

DocuSign Envelope ID:CB9148FA-1 E54-4268-Bp04-35B475692DFB
Permit NC0066028
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the
following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that quaked 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
122.411
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 IVPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
6. Reporting Requirements (Supersedes Section D. (2.)And Section E.(5.) (a)(,
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
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!aboutldi visions!water-resourccs!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:
Page 7 of 9

DocuSign Envelope ID:CB9148FA-1E54-4268-8004-358475692DFB
Permit NC0066028
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.
Thepermittee mayseek an electronic reporting waiver from the Division(see"How to Request a Waiver
P g
from Electronic Reporting"section below).
7. 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)1
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-e lectronic-reporting-rule
Electronic submissions must start by the dates listed in the"Reporting Requirements"section above.
8. 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
tobe 'n
approval at least sixty(60)days prior to the date the facility would be required under this permitbegin
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
Page 8 of 9

DocuSign Envelope ID:CB9148FA-1E54-4268-B004-35B475692DFn
Permit NC0066028
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%aboutldivisions/water-resources/edmr
9. Signatory Requirements_(Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)]
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:
littp://deq.nc.gov/aboutidivisionsiwater-resourcesfedni
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the
following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of
my knowledge and belief true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violations."
10. 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 122.411.
Page 9 of 9

DocuSign Envelope ID.CB9148FA-1 E54-4268 B004-358475692DFB
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Receiving Stream:Big Horse Creek Stream Class:C;HQWi *
USGS Quad:B12NE Warrenville,NC Subbasin: 05-07-02
Outfall Facility Facility Location
Latitude: 36°39'37.4"N 36°29'37.5"N North
Longitude: 81°30'32.3"W 81°30'33"W NPDES Permit NC0066028
HUC:05050001 Ashe County
{

TOWN OF LANSING
WASTEWATER TREATMENT PLANT PROJECT
UNC-CHAPEL HILL COLLABORATORY
INNOVATIVE HIGHLY TREATED WASTEWATER PILOT PROGRAM
COLLABORATORY PROJECT ID: collab_418(a)
ASHE COUNTY, NORTH CAROLINA
TREATMENT PLANT CALCULATIONS
October 25, 2024
Benjamin B Digitally signed by Benjamin B.Thomas
�s�` AcAA'1?/epJPmin B.Thomas,o=West
sO�`` � 4?s�IQPRs bt.LC,ou,email=bthomas@west-
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Prepared by:
Benjamin B. Thomas, PE
West Consultants, PLLC
405 South Sterling Street WEB Morganton, North Carolina 28655
Phone: [phone] CONSULTANTS r«c
Fax: [phone]
[e-mail]
North Carolina License No. P-0210

CONTENTS
I. Narrative
II. Design Flow, Peaking Factors, and Historical Data
III. Process and Buoyancy Calculations
IV. Flow Schematic and Hydraulic Grade Line
V. Auxiliary Power Source
VI. Influent Pump Station and Buoyancy Calculations

I. NARRATIVE
The existing WWTP is over 30 years old and is in a floodplain. A new WWTP will be constructed
above the 100-year flood elevation. The new WWTP will include an activated sludge package
plant consisting of dual influent screens, common flow equalization(surge)tank, a common
anoxic tank, dual aeration tanks, dual clarifiers, and common sludge holding tank(SHT). The
effluent from the package plant will be further treated by a cloth drum filter and by ultraviolet
disinfection(with a chlorine tablet backup system). A new influent pump station and new effluent
measurement and sampling will also be included.
The package plant will have additional treatment techniques or measures for meeting more
stringent effluent limits than the NPDES permit requires. This is due to the funding source(UNC
Collaboratory). The NPDES permit will not be modified. The more stringent limits are voluntary
with regard to regulations,but the manufacturer must demonstrate that the plant can produce the
effluent limits specified. Some degree of freedom will be given to the package plant manufacturer
in the details of the design. The following requirements/explanations are from the purchase
specifications (46 07 53):
The funding for the project requires that the treatment process be "innovative"and that it
produce an effluent water quality that is "highly treated. " To meet the "innovative"requirement,
the process shall feature one or more design elements that achieve a highly treated effluent
without the use of conventional tertiary techniques (e.g., do not use sand or membrane filtration).
Furthermore, due to the Owner's limited capacity to provide extensive operation and maintenance
man-hours, the process must be simple to operate and must use few electrical and mechanical
components. In addition, the process shall not use wearable materials as a significant part of the
pollutant removal system (e.g., do not use membrane bioreactors, microfiltration, or
ultrafiltration), nor shall it depend on chemical additives. Settling tubes in the clarifiers are not
permitted.
The "highly treated"requirement of the packaged wastewater treatment equipment is defined as
effluent that consistently meets the following limits:
Characteristics Influent Effluent
250
BOD5 mg/L 10.0 mg/L
250
TSS mg/L 10.0 mg/L
NH3-N 40 mg/L 10.0 mg/L
10.0 mg/L (or 60%
Total Nitrogen 50 mg/L reduction in TKN)
Total Phosphorus 8 mg/L 5 mg/L
Design flow is 50,000 GPD, which is the maximum flow per the NPDES permit.
The following calculations address the basic unit processes only, and only for the pollutants
regulated under the NPDES permit. Nutrient reduction(TN and TP) is to be accomplished by the
package plant and the plant manufacturer will determine the methods and design.Nutrient
reduction calculations are not included herein, since their reduction is not required by the NPDES
permit.

II. DESIGN FLOW, PEAKING FACTORS, & HISTORICAL DATA
The current annual average flow(ADF) is 0.008 MGD,based on the last full year of data(2023). The
past three years of flow data is shown below. Data is taken from eDMR's submitted by the ORC. Data
also includes influent BOD and TSS. No other influent parameters are monitored at the existing WWTP.
The design flow is 0.050 MGD, in keeping with the NPDES permit.
The peaking factors are based on the DEQ Minimum Design Criteria for pumps (2.5) and on the
engineer's judgement for detention time calculations(2.0) and freeboard calculations(3.0), as shown
below.
Design flow (peak month,ADF) 50,000 GPD
34.72 gpm
Peaking factors(peak hour to ADF):
influent pumps 2.5 86.81 gpm
flow EQ pumps 2.5 86.81 gpm
units DS of flow EQ(for det. time) 2.0 69.44 gpm
units DS of flow EQ(for freeboard) 3.0 104.17 gpm
In addition, rainfall rates versus flow at the WWTP were compared. No significant correlation was
observed. Refer to the graph below.
Influent BOD averages 300 to 361 mg/L, which exceeds normal domestic concentrations. This is due to
an apple cider facility that has attempted but not yet achieved compliance with pretreatment requirements.
The Town has a sewer use ordinance and the cider facility will have to come into compliance with the
ordinance. Therefore, it is not appropriate to design the new WWTP to treat this temporary situation of
high BOD. The plant will be designed to treat domestic-strength wastewater(250 mg/L BOD and 250
mg/L TSS).
25% flow equalization will be provided,to buffer spikes in flow rates and in pollutant concentrations.

TOWN OF LANSING WWTP DMR'S
FLOW _ BOD (influent) TSS (influent)
MON AVG DAILY MAX MON AVG DAILY MAX MON AVG DAILY MAX
January-21 0.010 0.011 318 580 133 154
February-21 0.015 0.001 165 210 136 180
March-21 0.010 0.014 154 233 74 100
April-21 0.010 0.012 143 207 105 250
May-21 0.012 0.014 182 310 141 274
June-21 0.010 0.014 385 420 152 202
July-21 0.015 0.007 492 710 269 414
August-21 0.015 0.007 438 660 242 390
September-21 0.006 0.006 396 670 151 380
October-21 0.007 0.013 348 670 137 170
November-21 0.007 0.009 215 260 158 214
December-21 0.005 0.006 412 730 106 202
YEAR AVG 0.010 304 150
January-22 0.005 0.006 500 680 352 524
February-22 0.008 0.016 543 710 122 152
March-22 0.007 298 530 156 178
April-22 0.009 0.011 231 370 121 165
May-22 0.014 0.016 230 360 117 182
June-22 0.014 0.016 226 420 120 144
July-22 0.010 0.014 253 290 136 302
August-22 0.006 0.008 208 240 210 260
September-22 0.006 0.007 340 630 187 286
October-22 0.009 0.012 352 568 220 403
November-22 0.013 0.020 187 570 214 292
December-22 0.008 0.008 237 410 219 414
YEAR AVG 0.009 300 181
January-23 0.007 0.008 328 400 118 122
February-23 0.007 0.007 207 330 114 202
March-23 0.007 0.007 231 370 141 234
April-23 0.007 0.007 400 630 184 362
May-23 0.007 0.008 421 660 157 316
June-23 0.007 0.007 271 190 164 264
July-23 0.008 0.009 363 530 135 248
August-23 0.008 0.009 420 610 267 622
September-23 0.008 0.009 440 560 254 416
October-23 0.009 0.009 473 560 123 178
November-23 0.008 0.009 470 650 181 252
December-23 0.010 0.015 307 470 176 298
YEAR AVG 0.008 361 168
maximum 0.015 0.020

Flow(MGD)
0 0 0
0 0 0 0 0
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3/1/2021
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Rainfall(IN)
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III. PROCESS CALCULATIONS
Note: Plant manufacturers may have variations in design based on experience and will be required to
meet a performance specification. These calculations only establish minimum requirements.
Design Parameters for Influent:
Flow= 50,000 gpd (Phase II of NPDES)
BOD5= 250 mg/L
TSS =250 mg/L
NH3-N=40 mg/L
Total N= 50 mg/L
Total Phosphorus= 8 mg/L
Design Criteria:
1. Effluent Limits:
BOD5= 30 mg/L Permit, 10 mg/L target
TSS =30 mg/L Permit, 10 mg/L target
NH3-N= 10 mg/L target
Total N = 10 mg/L (or 60% Reduction in TKN) target
Total P = 5 mg/L target
Fecal=200/100 ml Permit, 10/100 ml target
Note: these calculations do not address TN and TP, and there is no NPDES limit for these
pollutants.
2. Requirements:
Loading Rate: 10-25 lb BOD5/day/1000 cf
F/M: 0.05 to 0.15 lb BOD5/day/lb MLSS
02 Required: 1.2 lb/lb BOD5 Removed+4.6 lb/lb NH3-N Removed
SRT: < 30 Days
Surface Loading Rate: < 600 gpd/sf
Solids Loading Rate: < 50 lb/day/sf
Weir Loading Rate: < 10,000 gpd/ft
SCREENING
Use static screen such as Vulcan Industries, Inc. Model SS-24 with 2.5 mm openings and 340 gpm
capacity:

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INCH 01310 0.020 0.030 0.040 0.060 0.080 0.100
MM 0.25 0.50 .75 LO 15 2.0 2.5
Model Design Flow 'GPM A B C D
SS-18 30 60 90 140 180 200 220 201n' 4" 6'
SS-24 40 80 120 200 260 300 340 26112" 6'
SS-36 60 200 270 320 340 360 430 381n' 6'
SS-is 140 500 630 700 740 780 860 50 1/2" 8' 10' 9'
25.60 170 640 780 870 920 960 1070 621n- 10' 12' 10'
55-72 210 800 950 1050 1100 1150 1300 74 ir2' 10` 12 10"
65-96 270 1000 1200 1325 1400 1475 1650 98ln' 12' 14'
SS-120 330 1200 1450 1600 1700 1800 2000 122112' IY 18' 13'
flow rates are based upon dean water flow.
EQUALIZATION (SURGE)TANK
Based on 25% of Design Flow= 0.25 * 50,000 gpd= 12,500 gal
Pumps to use timers to equalize flow,but capacity to be 2.5 x Design Flow
Provide two pumps w/min. output> 90 gallons per minute and gravity overflow
REACTORS LOADING
BOD5 (Organic) Load(lb BOD5/day):
= Design Flow (mgd) * Influent Concentration (mg/L of BOD5)
=0.050 mgd *250 mg/L* 8.34
= 104.3 lb/day
Reactor Volume (cubic feet)
= 104.3 lb/day/(25 lb/day/1,000 cf)
= 4,172 cf
= 31,207 gal. (can include anoxic zone)
CLARIFIER LOADING
Design Criteria
Surface Loading Rate: < 300-400 gpd/sf
Solids Loading Rate: < 50 lb/day/sf
Weir Loading Rate: < 10,000 gpd/ft
MLSS = 3,000 to 6,000 mg/L
Detention Time: >4 Hrs

Surface Loading Rate (gpd/sf):
Based On Design Flow and Max. Surface Loading Rate Of 400 gpd/sf,
Total Min. Surface of Dual Clarifiers= 50,000 gpd/400 gpd/sf= 125 sf(300 sf will be provided)
Solids Loading Rate (lb/day/sf):
=MLSS * Design Flow/Total Min. Surface Area
=Max. 6,000 mg/L * 0.050 mgd * 8.34/300 sf
= 8.34 lb/day/sf
Weir Plate Loading Rate (gpd/ft):
Based On Peak Flow and Max. Weir Loading Rate of 10,000 gpd/ft
Proposed Weir Length of Dual Clarifiers>20 ft, < 4,000 gpd/ft
Detention Time (Hours):
Base on Design Flow and Min. 4 Hrs Retention Time
Required Volume= 50,000 gpd/24 hrs x 4 hrs=8,333 gal
F/M RATIO
Food(BOD5 Load)/Amount of Microorganisms:
Operation=0.05 to 0.15 lb BOD5/day/lb MLSS
=Organic Load/MLSS
= 104.3 lb BOD5/day/(3,000 mg/L * 0.031 MG *8.34)
= 0.131b BOD5/day/lb MLSS
or, if MLSS =6,000 mg/L
Then F/M=0.07
SLUDGE HOLDING TANK
Typical Waste Sludge Removed:
0.15-0.30 lb/lb BOD5 ,Use 0.225
Qi= Influent Flow
Qe=Effluent Flow
Qi= Qe=Design Flow
Qw=Wasted Sludge Flow Rate
BOD5To Be Removed:
=(Raw BOD5—Target Limit) * Design Flow
=(250 - 10)mg/L * 0.050 mgd * 8.34
= 100.1 lb BOD5/day Removed
Wasted Sludge to be Removed(lb/day):
Using 0.225 lb/lb BOD5:
= 100.1 lb BOD5/day Removed * 0.225 lb/lb BOD5
=22.5 lb/day
Wasted Sludge Flow Rate (Qw):
Assume 0.75% Sludge Concentration(7,500 mg/L)
=Wasted Sludge to be Removed/Concentration of Sludge

=22.5 lb/day/(7,500 mg/L * 8.34)
=360 gpd
Sludge Tank Design (Gallons):
Volume Needed if Sizing Based on 30 Days of Storage
=Wasted Sludge Flow Rate * 30 Days
=360 gpd * 30 Days
= 10,800 gallons
Volume Needed if Sizing Based On 3.5 cf/capita and Lansing Population of 128
=448 gallons
Base Sludge Storage size on 30 Days of Storage= 10,800 gallons
SRT (SLUDGE AGE)
MLSS = 3,000 mg/L
Aeration Tank Volume= 0.030 MG
Qw= Sludge Wasting Rate= 360 gpd
Qe= Qi= 50,000 gpd
SSw= Solids concentration in wasted sludge(0.75% = 7,500 mg/L)
SSe= Solids concentration in effluent= 10 mg/L
SRT=MLSS * Aeration Tank Volume/(Qw * SSw+Qe * SSe)
= 3,000 mg/L * 30,000 MG/(360 gpd * 7,500 mg/L+ 50,000 gpd * 10 mg/L)=28 Days
BLOWER SIZING/AIR REQUIRED
Aeration Requirements
Influent Design Conditions
Influent NH3-N=40 mg/L Max.
BOD5: 250 mg/L * 0.050 mgd * 8.34= 104.3 lb BOD5/day
NH3-N: 40 mg/L * 0.050 mgd * 8.34= 16.68 lb NH3-N/day
AOR (Actual 02 Required)(lb/hr):
=4.6 * (NH3-N) + 1.2 * (BOD5)
=201.9 lb/day
= 8.41 lb/hr per side
Ambient and Wastewater Adjustments:
T=20°C
Alt. =2,666 ft
CS= 9.09 mg/L=02 Saturation Concentration @ Standard T and P
(Eddy-Aecom, Appendix E)
Calt= 8.25 mg/L at 800 meters above sea level (Eddy-Aecom, Appendix E)
Coo=2.0 mg/L (working dissolved 02)
a=0.80
(3 =0.95
0=Wastewater Temperature Correction Factor= 1.024
SOTR=AOR/ [((3 *Calt-CD())/Cs) * (6)T 20 * a]
= 8.14/ [(0.95 * 8.25-2)/9.09) * 1 * .8]

= 16.4 lb/hr
Then Std Air Req'd= SOTR/(O2 Density * SOTE)
Use Fine Bubble Diffuser SOTE= 1.9%/ft @ 5 scfm
02 Density= (0.075 lb/cf) * (23.2%02)= 0.0174 lb/cf
Diffuser SOTE= 19% Efficiency @ 10' Submergence
Std Air Req'd= 16.4 lb/hr/(0.0174 lb/cf* 6.19)
=4,961 cf/hr
= 83 scfm
Air Required Based on Aeration Requirement:
Sludge Holding Tank= 10,800 gal * 0.1337 cf/gal * 30 cfiu/1000 cf=43.3 cfm
Airlifts on Plant=20%of Air Required for Aeration
= 0.20 * 83 scfm= 16.6 cfm
Total Air Required= [83 (Aer. Tanks) +43.3 (Sludge Tank) + 16.6 (Airlifts)] scfm
Total Air Required= 142.9 scfm
Total Air Demand on Blower System Based on Mixing:
Aeration Tank= 30,000 gal * 0.1337 cf/gal * 20 cfm/1000 cf= 80.2 cfm
Airlifts on Plant=20%of Air Demand for Aeration= 16.6 cfm
Total Air Demand= 80.2 +43.3 + 16.6= 140.1 cfm
Base Air Required on Aeration Requirement of 142.9 scfm (excluding surge/EQ air)
BLOWER SELECTION
Aeration Basins and Air Lifts:
Inlet Conditions: MSL=2,669= 13.36 psia, T= 100°
Icfm= [(14.7 Psia/ 13.36 Psia)] * 1 scfm * [(460° + 100°)/(460° + 68°)]
Icfm= 1.17 scfm,
Inlet Air Req'd Based on Aeration= (83 scfm + 16.6 scfm) * 1.17 = 116.5 icfm
Equalization Tank Blower Sizing:
Mixing @ 20 cfm/1000 cf
= 12,500 gal * 20 cfui/1000 cf* 0.1337 cf/gal * 1.17 scfm= 39.1 icfm
Sludge Holding Tank Blower Sizing:
Mixing at 30 cfm/1,000 cf
=10,800 gal * 30 cfm/1,000 cf* 0.1337 cf/gal * 1.17 = 50.7 icfm
CALCULATE AERATION BASIN & AIR LIFTS BLOWER PRESSURE AND
HORSEPOWER:
Line Pressure:
10 ft Submergence= 120"H2O
10"Filter/Silencer(Dirty) = 5"
Inlet Guide Vane=4"
Check Valve= 0.4"

Butterfly Valve= 0.4"
Outside Piping= 0.6"
In-Tank Piping= 11"
Diffuser @ 5 scfm=22"
Total= 163"= 5.9 psi, Use Max. of 6.0 psi
Horsepower Required:
wRT1 p 1-1 - 11
Pw 550ne *SF
pi�
Pw=power requirement of each blower,hp
w=weight of flow of air=inlet air req'd * 0.075 lbs of air/cf
R = gas constant for air= 53.3 ft-lb/lb air-°R
Ti = absolute inlet temperature= (460+100) °R
Pi =absolute inlet pressure= 13 psia @ MSL=2,666
P2= absolute outlet pressure=(13.7 + 6)psia= 19 psia
n =(k-1)/k= 0.283 for air
e=blower efficiency= 75% assumed
550 = ft-lb/s-hp
SF = 1.15 safety factor
Capacity required= 83 scfm+ 16.6 scfm= 99.6 scfm
w=99.6 scfin/(60 min/sec)*0.075 pcf(lbs of air/cf) = 0.12 lb/sec
Pw=(0.12 * 53.5 * 560°)/(550 * 0.283 * 0.75) * [(19/13)0.283— 1] * 1.15
Pw=4.0 total minimum HP req'd.
Note: provide two blowers (one duty and one standby) with a minimum of 5.0 HP motors, rated @
118 icfn and operating at a maximum of 6.0 psi
NO. OF DIFFUSERS REQUIRED
Each fine bubble diffuser operating at 5 scfm
Surface area of one aeration tank= 150.5 (10'9"x 14'0")
Inlet air req'd for aeration tanks= 99.6/2 = 50 scfm
No. of diffusers per tank= (50/5) scfm= 10 diffusers (evenly distributed across the floor)
ROTARY DRUM CLOTH FILTER
Select unit designed for 50,000 gpd, such as Purestream/ES Microscreen Drum Filter Model
#2FBO. Note: this unit is not required for meeting the NPDES limits nor the target limits. But it is
planned for the purpose of ensuring compliance during occasional package plant upsets.
ULTRAVIOLET DISINFECTION EQUIPMENT
UV equipment will be provided based on the following disinfection criteria:
Peak Flow= 100,000 gpd
UV Transmittance: 65%
Total Suspended Solids: 30 mg/L (10 mg/L target)

Fecal Coliform: 200/100 ml,based on a 30-day geometric mean of daily samples (10/100 mL
target)
Max Average Particle Size: 30 microns
Min. Contact Time= 30 seconds
Contact Channel Volume> 100,000 gpd * 30 sec= 35 gal
Use channel=4' x 1.1' x 1.17' = 39 gal.
FLOW EQUALIZATION (SURGE)PUMPS
Capacity=2.5 x Design Flow= 87 gpm,use 90 gpm
Static Head, if tank is at low level = 10 ft
Friction Head(Assume 2"pipe, C=120) = (20 LF)(21 ft/100 ft) =4.2 ft
.•. TDH = 10ft+4.2ft= 14.2ft

PACKAGE PLANT BUOYANCY
Scenario 1:Flood Level = 2659.21 (Hurricane Helene, September 2024)
or Flood Level = 2657.4 (FIRM published BFE); use 2659.21
Uplift=62.4 pcf x(2,659.21' -2658.25') x 14' x 1.0' = 838.66 plf
+62.4 pcf x(8"/12) x 16 ft x 1.0 ft(fdn) =665.60 pfl
Total = 1504.26 plf
Resistance=Tank wt. = 60,000 lbs/67 ft = 895.52 plf
Slab wt. = 150 pcf x 16' x 8"/12 =1600.00 plf
Total =2,495.52 plf
Resistance exceeds uplift(not including wt. of soil above slab extensions)
Okay
Scenario 2: Saturated ground but Big Horse Creek not at flood stage
Uplift=62.4 pcf x(2,664' avg ground elevation-2658.25') x 14' x 1.0' = 5023.2 plf
+62.4 pcf x(8"/12) x 16 ft x 1.0 ft(fdn) =665.6 plf
Total = 5,688.8 plf
Resistance=Tank wt. = 60,000 lbs/67 ft = 895.52 plf
Slab wt. = 150 pcf x 16' x 8"/12 =1600.00 plf
Total=2,495.52 plf
If add 1' wide saturated soil on sides=2' x(2664'-2658.25') x(120 pcf-62.4 pcf)
=662.40 plf
Then total resistance=3,158 plf
No Good-Therefore, use drainage system to prevent saturation condition.
CHLORINE CONTACT BASIN BUOYANCY
Average ground elevation=2661.5
Bottom of concrete=2659.87- 8"=2659.20 (2.3' avg. bury)
Top of walls=2663.37 (3.5' ht.)
Perimeter walls= 13' x 10.5' outside dimensions (neglect interior baffles weight)
Foundation= 13.5' x 11' x 8"
Uplift=62.4 pcf x (13' x 10.5' x 2.3' + 13.5' x 11' x 8"/12)=25,799 lbs.
Resistance=45' x 3.5' x 6"/12 x 150 pcf= 11,813 lbs.
+ 13.5' x 11' 8"/12 x 150 pcf= 14,924 lbs.
+ saturated soil on sides =45' x 2.3' x 3"/12 x (120 pcf-62.4 pcf) = 1,490 lbs.
Total= 28,227 lbs>25,799 lbs. OK

IV. FLOW SCHEMATIC & HYDRAULIC GRADE LINE
Note: detention time calculations for tablet chlorination/dechlorination also included below.
Town of Lansing WWTP Replacement
Hydraulic Grade Line(HGL)&Contact Time Calculations
PEAK FLOWS
Design flow(peak month,ADF) 50,000 GPD Orifice Eqn
34.72 gpm Q=CdASQRT(2gh)
Peaking factors(peak hour to ADF):
influent pumps 2.5 86.81 gpm 8"effluent pipe:
flow EQ pumps 2.5 86.81 gpm Q 104.17 gpm
units DS of flow EQ(for det.time) 2.0 69.44 gpm Q 0.232 cfs
units DS of flow EQ(for freeboard) 3.0 104.17 gpm ID 8 inches
A 0.349 sq.ft.
Base Flood Elevation 2657.4 MSL Cd 0.6
BFE+2' 2659.4 MSL h 0.019 feet
chlorine contact perforated plates:
HGL n 64 no.of perforations
8"Effluent Pipe Invert Out 2658.90 MSL(1.5'above BFE) Q 104.17 gpm
Max.head(inlet control,slope is steep) 2659.59 Q 0.232 cfs
Free fall at weir notch 1.0 feet ID 1.0 inches
Weir notch 2660.59 A 0.349 sq.ft.
Max.head at weir(22.5 deg V-notch),PF=3 0.74 feet Cd 0.6
Max.head at weir(22.5 deg V-notch) 2661.33 h 0.019 feet,per plate
Free Fall at Dechlor Unit Outlet Invert 3 inches(per Norweco) Npl 5 no.of plates
Dechlor Unit Outlet Invert El. 2661.58 H -____. 0.10 feet,total head loss due to plates
Dechlor Unit internal headloss 0.50 feet(no data available.,assvmafuH-pipe)-- -----_
Allowance for head loss thru CI contact channel 0.25 feet perforated plates&dechlor unit 22.5 deg.V-notch weir equation:Q(gpm)=223.1 H^2.5
Free Fall at Chlor Unit Outlet Invert 3 inches(per Norweco)
Chlor Unit Outlet Invert El. 2662.58
Chlor Unit internal headloss 0.50 feet(no data available,assume full pipe)
UV Unit outlet pipe invert(Chlor Unit+0.2') 2663.28(could be lower since normally would bypass UV if using tablets)
UV Unit Weir Elev. 2663.78(0.38'min.above DS water level,per Trojan Model 3075K;use 0.5')
UV Unit Outlet Box Floor El. 2662.48(1.30'below weir crest,per Trojan Model 3075K)
Free Fall at Drum Filter Outlet 6.00 inches
Drum filter outlet pipe invert elev. 2664.28
Drum filter inlet pipe invert elev. 2665.28(1'-0-1/8"per Purestream model 2FBO)
Drum filter max.water level 2666.44(2.16'above outlet invert,per Purstream Model 2FB0)
Free Fall at WWTP Clarifiers Pipe Invert Out 9.72 6 inches,min.per Purestream
WWTP Clarifiers Effluent Pipe Inv.Out Elev. 2667.25
WWTP Top of Wall 2670.25(3'above effluent pipe invert,per Purestream)
Chlorine Contact Basin
Flow Rate to Calculate Detention Time 69.44 gpm,peak hour
Detention time required 15 minutes(MDC#8&Ten States Std.102.44)
Volume required 1,041.67 gallons
139.26 cubic feet
Target Length-to-Width Ratio 39(20 to 40 per Eddy-Aecom,5th Edition,page 1349)
Try channel width= 18 inches
Try channel depth= 19.5 inches
Channel length required for target ratio 58.50 feet
Volume provided 142.59 cubic feet
(add perforated plates/baffles to prevent short circuiting)
Dechlorination Contact
Flow Rate to Calculate Detention Time 69.44 gpm,peak hour
Detention time required 0.5 minutes(MDC#9&Ten States Std.102.44)
Volume required 34.72 gallons
4.64 cubic feet
Min.length(if width same as chlor channels and water
is 1'deep) 3.09 feet

Town of Lansing WWTP Replacement
Hydraulic Grade Line(HGL)&Contact Time Calculations
NPDES Design Flow
Design flow(peak month,ADF) 50,000 GPD Orifice Eqn
34.72 gpm Q=CdASQRT(2gh)
Peaking factors(peals-heur to AOF):
influent pumps 1 34.72 gpm 8"effluent pipe:
flow EQ pumps 1 34.72 gpm Q 34.72 gpm
units DS of flow EQ(for det.time) 1.0 34.72 gpm Q 0.077 cfs
units DS of flow EQ(for freeboard) 1.0 34.72 gpm ID 8 inches
A 0.349 sq.ft.
Base Flood Elevation 2657.4 MSL Cd 0.6
BFE+2' 2659.4 MSL h 0.002 feet
chlorine contact perforated plates:
HGL n 64 no.of perforations
8"Effluent Pipe Invert Out 2658.90 MSL(1.5'above BEE) Q 34.72 gpm
Max.head(inlet control,slope is steep) 2659.57 Q 0.077 cfs
Free fall at weir notch 1.0 feet ID 1.0 inches
Weir notch 2660.57 A 0.349 sq.ft.
Max.head at weir(22.5 deg V-notch),PF=3 0.48 feet Cd 0.6
Max.head at weir(22.5 deg V-notch) 2661.05 h 0.002 feet,per plate
Free Fall at Dechlor Unit Outlet Invert 3 inches(per Norweco) Npl 5 no.of plates
Dechlor Unit Outlet Invert El. 2661.30 H _ __ - 0.01 feet,total head loss due to plates
Dechlor Unit internal headloss 0.50 feet(no data available a< e-fol4-p;pr)---------
Allowance for head loss thru CI contact channel 0.25 feet perforated plates&dechlor unit 22.5 deg.V-notch weir equation:Q(gpm)=223.1 H^2.5
Free Fall at Chlor Unit Outlet Invert 3 inches(per Norweco)
Chlor Unit Outlet Invert El. 2662.30
Chlor Unit internal headloss 0.50 feet(no data available,assume full pipe)
UV Unit outlet pipe invert(Chlor Unit+0.2') 2663.00(could be lower since normally would bypass UV if using tablets)
UV Unit Weir Elev. 2663.50(0.38'min.above DS water level,per Trojan Model 3075K;use 0.5')
UV Unit Outlet Box Floor El. 2662.20(1.30'below weir crest,per Trojan Model 3075K)
Free Fall at Drum Filter Outlet 6.00 inches
Drum filter outlet pipe invert elev. 2664.00
Drum filter inlet pipe invert elev. 2665.00(1'-0-1/8"per Purestream model 2FBO)
Drum filter max.water level 2666.16(2.16'above outlet invert,per Purstream Model 2FBO)
Free Fall at WWTP Clarifiers Pipe Invert Out 9.72 6 inches,min.per Purestream
WWTP Clarifiers Effluent Pipe Inv.Out Elev. 2666.97
WWTP Top of Wall(or higher) 2669.97(3'above effluent pipe invert,per Purestream)
Chlorine Contact Basin
Flow Rate to Calculate Detention Time 34.72 gpm,peak hour
Detention time required 15 minutes(MDC#8&Ten States Std.102.44)
Volume required 520.83 gallons
69.63 cubic feet
Target Length-to-Width Ratio 39(20 to 40 per Eddy-Aecom,5th Edition,page 1349)
Try channel width= 18 inches
Try channel depth= 19.5 inches
Channel length required for target ratio 58.50 feet
Volume provided 142.59 cubic feet
(add perforated plates/baffles to prevent short circuiting)
Dechlorination Contact
Flow Rate to Calculate Detention Time 34.72 gpm,peak hour
Detention time required 0.5 minutes(MDC N9&Ten States Std.102.44)
Volume required 17.36 gallons
2.32 cubic feet
Min.length(if width same as chlor channels and water
is 1'deep) 1.55 feet

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WASTEWATER TREATMENT PLANT PROJECT WEST 408 Sown Sterling Street
UNC•CHAPEL HILL COLLAIORATORY•INHOVATIVE FLOW SCHEMATIC Morganton, NC 28865
HIGHLY TREATED WASTEWATER PILOT WORM NTS .4111-1t QONSUIPiNTSmac [phone]
rex [phone]
COLLAIORATORY PROJECT ID:CoIIalL41I(0) NC License No. P-0210
www,west-consLltants.corn

2690 2610
SCREEN
2680 — 2680
(A)
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EQUAURAIION - - 1I _ ULTRAVIOLET FLOW
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-vr.=2663.n*VC AVG=AVERAGE ROW NPOE5 JMI1,50,000 GPO:
-.w.=2663.7D,AVC; PEAK=3 K AVG 1151303 GPO)
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2610 .,w•266'a,AVG; n, PUMP . 2610
fREMAND>1.79'
TOWN OF LANSING
WASTEWATER TREATMENT PLANT PROJECT HYDRAULIC PROFILE
UNC-CHAPEL HILL COLLABORATORY-INNOVATIVE HORIZONTAL-NO SCALE 4.14COlIAJID►Pti'f9Kr *r I,awl
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F.HIGHLY TREATED WASTEWATER PILOT PROGRAM VERTICAL-P"=10' 6C NO.>-62`0
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COLLABORATORY PROJECT ID:collab_418(0)

V. AUXILIARY POWER SOURCE
Power Reliability per 15A NCAC 02T .0505(1)
Power reliability shall be provided, consisting of: (1) automatically activated standby power supply,
located onsite, and capable of powering all essential treatment units under design conditions.
The electrical drawings and specifications call for a new standby diesel generator with automatic transfer
switch. The generator is sized to power all connected loads, including blowers,pumps, controls, SCADA,
alarms, light, and disinfection system.

VI. INFLUENT PUMP STATION & BUOYANCY CALCULATIONS
I. DESIGN FLOW:
A. PRESENT FLOW:
2023 Average Annual Flow per DMR's 8,000 GPD
Peak Month Flow per DMR's (July '21) 15,000 GPD
Peak Day Flow per DMR's (Nov'22) 20,000 GPD
Peak Hour Flow(3x Peak Month) 45,000 GPD
31 GPM
B. FUTURE FLOW:
Future flow is based on Phase 2 of NPDES 50,000 GPD
35 GPM
Peak Flow(3x) 104 GPM
Design Pumping Rate: 104 GPM

II. SYSTEM CURVES: LANSING WWTP INFLUENT PUMP STATION
FORCEMAIN SIZE: 4" DIP I.D. = 4.18 INCHES
EQUIVALENT LENGTH= 262 LF
LOW WATER ELEVATION= 2625.79 MSL
HIGH POINT= 2673.00 MSL static screen inlet(approx)
STATIC HEAD= 47.2 FEET
C= 120 C= 140
Q f Hf Hs TDH f Hf Hs TDH VELOCITY
GPM FT/100FT FEET FEET FEET FT/100FT FEET FEET FEET FPS
0 0.000 0.00 47.21 47.21 0.000 0.00 47.21 47.21 0.00
10 0.010 0.03 47.21 47.23 0.007 0.02 47.21 47.23 0.23
25 0.054 0.14 47.21 47.35 0.041 0.11 47.21 47.31 0.58
31 0.082 0.21 47.21 47.42 0.061 0.16 47.21 47.37 0.73
50 0.195 0.51 47.21 47.72 0.147 0.38 47.21 47.59 1.17
75 0.413 1.08 47.21 48.29 0.311 0.81 47.21 48.02 1.75
104 0.756 1.98 47.21 49.19 0.569 1.49 47.21 48.70 2.43
125 1.063 2.79 47.21 49.99 0.799 2.10 47.21 49.30 2.92
150 1.489 3.91 47.21 51.11 1.119 2.94 47.21 50.14 3.51
175 1.980 5.19 47.21 52.40 1.489 3.91 47.21 51.11 4.09
MIN. PRESENT PUMPING RATE: 31.25 GPM red if < or =2 fps^
MIN. FUTURE PUMPING RATE: 104.00 GPM
PUMP SELECTION:
OPERATING CONDITIONS BASED ON C=120(SEE ATTACHED CURVES):
ONE PUMP ON: 104 GPM @ 49 FT. TDH
TWO PUMPS ON: GPM @ FT. TDH
EQUIVALENT LENGTH CALCULATIONS 4 " FORCE MAIN
EQ LENGTH PER
ITEM UNIT QTY EQ LENGTH(feet)
PS SUCTION PIPE 0 0.0
(SUCTN SUCTION 90° BEND 0 0.0
SIDE) SUCTION 45° BEND 0 0.0
DISCHARGE 90° BEND 5.9 3 17.7
PS DISCHARGE PIPE 1.0 50 50.0
(DISCH GATE VALVE (DIS. SIDE) 2.9 1 2.9
SIDE) CHECK VALVE 38.0 1 38.0
TEE(BRANCH FLOW) 12.0 1 12.0
45° BEND 3.5 4 14.0
FM
FIITGS 90° BEND 5.9 3 17.7
TEE(BRANCH FLOW) 12.0 0 0.0
4 " FM(L) FORCE MAIN 1.0 110 110.0
TOTAL 262.3

III. WETWELL DESIGN:
A. DETERMINE OPERATING VOLUME:
PRESENT: FUTURE:
T= 30 MINUTES (7.5TO30) T= 15 MINUTES (7.5TO30)
Qddf= 13.89 GPM peak day Qddf= 34.72 GPM
Q= 104.00 GPM Q= 104.00 GPM
V= 361.02 GAL. V= 361.02 GAL.
B. SELECT WETWELL DIMENSIONS:
DIAMETER: 6 FEET WETWELL DEPTH = 44.21 FEET
PRESENT CONDITIONS: FUTURE CONDITIONS:
OPERATING DEPTH: 1.71 FEET OPERATING DEPTH: 1.71 FEET
TOP ELEV= 2666.50 TOP ELEV= 2666.50
GROUND = 2666.00 GROUND = 2666.00
LOWEST SEWER IN= 2629.00 LOWEST SEWER IN = 2629.00
LAG PUMP ON= 2628.50 LAG PUMP ON = 2628.50
ALARM= 2628.00 ALARM = 2628.00
LEAD PUMP ON = 2627.50 LEAD PUMP ON= 2627.50
PUMPS OFF = 2625.79 PUMPS OFF = 2625.79
BOTTOM= 2622.29 BOTTOM= 2622.29
DEPTH REQUIRED FOR PUMP PROTECTION: 3.50 FEET
PRESENT CONDITIONS CYCLES PER HOUR: 2.0
FUTURE CONDITIONS CYCLES PER HOUR: 4.0
C. CHECK FLOTATION:
1. BUOYANCY= SUBMERGED VOLUME X 62.4 PCF:
WETWELL I.D. 6.00 FEET
WETWELL O.D. 7.00 FEET
SUBMERGED DEPTH: 44.37 FEET
BUOYANCY: 106,560 LBS.
2. WEIGHT OF WETWELL:
TOP = 9.00 INCHES AND 3,876 LBS.
RISER= 42.96 FEET @ 1910.00 LBS/VF = 82,048 LBS.
BOTTOM= 8.00 INCHES AND 3,850 LBS.
TOTAL= 89,774 LBS.
FACTOR OF SAFETY= 0.84 NO GOOD
EXTENDED BASE SLAB IS REQUIRED
BASE SLAB EXTENSION = 8.0 INCHES
HEIGHT OF SOIL= 43.71 FEET
WET SOIL WT.(50PCF) = 34,995 LBS.
THEN TOTAL RESISTANCE TO UPLIFT= 124,769 LBS.
FACTOR OF SAFETY = 1.17 OK

V = T Qddf/1 — Qddf \
\ Q / ,
olume within the pump station(gallons) I
,le cycle time between starts(minutes)
sign daily flow to pump station (gallons
ing rate of a single pump (gallons per
WETWELL DATA PER TINDALL CONCRETE
G-SERIES
DIA. O.D. WEIGHTS HEIGHT (INCHES) EXTENDED BASE
(FT) (FT) SER(LB/V BASE (LB)* TOP (LB)_ BASE TOP O.D. (FT)
4.0 4.83 915 1375 1242 6 8 5.83
5.0 5.83 1370 2600 2773 8 9 7.17
6.0 7.00 1910 3850 3876 8 9 8.33
7.0 8.17 2207 5240 7625 8 16 9.33
8.0 9.33 2879 6840 8689 8 16 11.00
10.0 11.67 4481 12030 14312 9 16 14.00
* BASED ON BASE AREA X HT X 150 PCF
1

CV
C R U N D FO5 } ` Grundfos Quotation System 24.3.1
Pump Performance Datasheet
..unto rrer • . 'T-!.-r,'':I . • , :!
Customer ref./PO Model :SLV.3+3.A40i.55.4
Tag lumber :001 Stages :1
•Service Based on curve n Wmber :RC 10618
I Cuantily :1 Date last saved :101092024 10:11 AM
Operating Conditions Lipid
e'•.r Il.. .type V'S "_,_
!Differential head i pressure,rated(requested) :49.00 ft Add Tonal liquid description
i Differential head 1 pressure,rated(actual) :49.09 ft Sobs diameter,max :0.00 in
Suction pressure,rated 1 max :0.00 i 0-00 psi_g Temperature,max :8810 deg F
NPSH available,rated :Ample Fluid•- :, ,rated i max :1.00011.000 SG
Ste Supply Frequency :80 Hz Pressor Data
Performance Mfaxirtun working pressure :24.15 psi_g
.r-•+ . . . :i rpm Driver&Power Data Alax density)
Efficiency :32.30% '•.,. sang • cation :'-, power i norr-ove :r.:ng•
NPSH required i margin requred :3.59 i 0_00 ft Service factor :1.15 i used)
Ns(top.eye flour;.Nss(imp.eye'Tow) :1,67215,125 US Units Power,hydraulic 129 hp
MCSF •- Rated power{bases on duty print) :319 hp
Head,maximum,rated diameter :55.80 ft Max power(non-overloading) :5.43 hp
Head rise to shutoff : 13.68% Moto,ratng :5.50 hp!4.10 kW(Fixed)
Row best el.point :200.1 USgpm Efficiency at 100% :87.8
Row ratio,rated 1 BEP :51.97% Efficiency at 75% :87.8
Diameter ratio,rated I max) :100.00% Efficiency at 50°4 :882
Head rato(rated dia 1 max dial :100.00% Power Factor at 100% :0.78
Solids diameter lint :3.15 it Pacer Factor at 75% :0.7
•Cq,ChrCe'Cn [ANSIMI B.6 7-20 t 0] :1.00 i 1.00 11.00/1.00 Power Factor at 50% :0.59
1 Selection st3tt s :AcceptAile Full Load Amps :9.05
Curve Tolerance :ANSI/H111.6:2017 382 Locked Rotor hops :80
I Consult Factory for a diferent Tolerance Nema Code Ltr :K
r.Preferred operafz1g region
72
r>s
se c6 31
6.30 in 35 37
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35
24 31
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z c
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Flow- USgpm

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