NC0040011_Authorization to Construct_20180926

UM aIle
HK
September 26, 2018
Williams, carmen, and
Engineering • Architecture • Land Surveying
Dr. Bing Bai
North Carolina Department of Environment & Natural Resources
Division of Water Resources
512 N. Salisbury Street, 9t" Floor (Archdale Bldg)
Raleigh, NC 27604
Subject: Town of Yanceyville — New Aerobic Digesters
Yanceyville, NC
AWCK Job # 15080
Dear Dr. Bai,
On behalf of the Town of Yanceyville, please find attached one (1) hard copy and one (1) digital set of
bid documents for proposed modifications to the Yanceyville Wastewater Treatment Plant for your
review. The bid documents include a full size drawing set, as well as a set of specifications.
Inc
The Town of Yanceyville would like to officially request an Authorization to Construct to allow upgrades
to be made to the existing facility — NPDES Permit Number NC0040011. The project has been submitted
to the Water Infrastructure Department for funding through the Community Development Block Grant
(CDBG) Program. The current CDBG project number is 16-1-2730. The project must be approved by
January 7t", 2019 to retain CDBG funding.
The project proposes to install a new spiral screen, grit removal equipment, aerobic digester, sludge
storage tank and backup generator. Two new waste sludge transport pumps will be required in the SBR
to transport the sludge due to the elevation of the proposed tanks. Additionally, a sludge loading
station is proposed to load stabilized solids for transport from the facility. Lastly, a new effluent control
device will be installed to provide more uniform flow from the equalization tank to the chlorine contact
chamber to improve effluent disinfection during periods of elevated flow. This project is the first step
toward removing the existing sludge lagoon from service due to environmental concerns.
This project was previously issued an Authorization to Construct on December 1, 2015 (ATC No.
040011A01). The previous approval did not include a new bar screen, grit removal system or generator.
The project did not move forward due to funding issues.
If questions arise during your review, please feel free to contact me at 336-226-5534 or
[e-mail].
Sincerely,
ALLEY, WILLIAMS, CARMEN, & KING, INC.
TROY KING, P.E.
740 Chapel Hill Road (27215) - P.O. Box 1179 - Burlington, North Carolina 27216
Tel. - [phone] - Fax — [phone] - awck.com
ESTABLISHED - 1960

North Carolina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
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 part 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.
I. For more information, visit the Division of Water Resources web site at: http://Portal.ncdenr.org/web/wq/swp/ps/npdes.
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
Town of Yanceyville
Signature authority's name per 15A NCAC 02T .0106(b)
Mr. Brian Collie
Signature authority's title
Town Manager
Complete mailing address
PO Box 727, Yanceyville, NC 27379
Telephone number
336-694-5431
Email address
[e-mail]
B. PROFESSIONAL ENGINEER
Professional Engineer's name
Troy King
Professional Engineer's title
Civil Engineer
North Carolina Professional Engineer's License No.
035017
Firm name
Alley, Williams, Carmen and King, Inc.
Firm License number
F-0203
Complete mailing address
PO Box 1179, Burlington, NC 27216-1179
Telephone number
336-266-5534
Email address
[e-mail]
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 1

North Carolina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
C. NPDES PERMIT
NPDES Permit number
NCO040011
Current Permitted flow (MGD) — include permit
flow phases if applicable
0.45
D. PROJECT DESCRIPTION
Provide a brief description of the project: The project includes installation of (2) 60 -ft diameter aerobic digesters with 30 HP
floatine aerators. UDeraded sludee waste oumos will be installed to oumo solids from the existine SBR to the new dieesters. A
sludge loading platform will be installed to fill tankers with stabilized solids to be transported and land applied under separate
contract. Installation of a new effluent flow control device will provide more uniform flow from the equalization tank to the
chlorine contact chamber to improve effluent disinfection. Installation of the above will allow for the abandonment and closure
of the existiniz sludee lagoon after sufficient drvine time has occurred. In addition. a new bar screen. izrit removal system and
enerator will be installed as part of the project
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 133-31 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.
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.
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 2

North Carolina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
® 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 M 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
® Electrical ❑ Not Applicable
❑ Instrumentation/Controls ® Not Applicable
❑ Architectural ® Not Applicable
❑ Building Mechanical ® Not Applicable
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 3

North Carolina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
❑ 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 publically 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: Refer to drawing sheet
#4 for construction sequence.
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.
❑ Influent pollutant loading demonstrating how the design influent characteristics in Section 4.13.2 of this form were
determined.
® Pollutant loading for each treatment unit demonstrating how the design effluent concentrations in Section 4.6.2 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/Certification
Not
Applicable
Date
Submitted
Date
Approved
Permit/
Certification
Number
If Not Issued Provide
Status and Expected
Issuance Date
Dam Safety
X
Soil Erosion and Sediment Control
X
USCOE /Section 404 Permit
X
Water Quality Certification (401)
X
USCOE / Section 10
X
Stormwater Management Plan
X
CAMA
X
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 4

Nath Carolina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
NCDOT Encroachment Agreement X
Railroad Encroachment Agreement X
Other:
J. Residuals Management Plan
❑ For all new facilities, expanding facilities, or modifications that result in a change to sludge production and/or sludge
processes, provide a Residuals Management Plan meeting the requirements of 15A NCAC 02T .0504(*) and .0508; the Plan
must include:
❑ A detailed explanation as to how the generated residuals (including trash, sediment and grit) will be collected, handled,
processed, stored, treated, and disposed.
❑ An evaluation of the treatment facility's residuals storage requirements based upon the maximum anticipated residuals
production rate and ability to remove residuals.
❑ A permit for residuals utilization or a written commitment to the Applicant from a Permittee of a Department approved
residuals disposal/utilization program that has adequate permitted capacity to accept the residuals or has submitted a
residuals/utilization program application.
❑ If oil, grease, grit or screenings removal and collection is a designated unit process, a detailed explanation as to how the
oil/grease will be collected, handled, processed, stored and disposed.
® Not Applicable. - The Town of Yanceyville will continue the contract hauling of stabilized solids.
SECTION 4: PROJECT INFORMATION
A. WASTEWATER TREATMENT PLANT FLOW INFORMATION —COMPLETE FOR NEW OR EXPANDING FACILITIES
1. Provide the following flow information:
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 5
Plant Flows
Existing Plant Design
0.45 MGD
Current NPDES Permit Limit
0.45 MGD
Current Annual Average
(past 12 months)
0.28 MGD
For Past 12 Months:
Start Date: month/yr
End Date: month/yr
For Past 24 Months:
Start Date: month/yr
End Date: month/yr
Maximum Month
MGD
MGD
Maximum Day
MGD
MGD
Peak Hour
MGD
MGD
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 5

North Carolina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
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
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:
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:
4. Per 15A NCAC 02T.0505(*)., by-pass and overflow lines are prohibited. Is this condition met by the design? ® Yes or ❑ No
If no, describe the treatment units bypassed, why this is necessary, and where the bypass discharges:
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 6
Project Basis of Design
Design Influent
Design Influent
Influent
Concentration
Load
Concentration -
(Must be
(Must be
Current 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.H])
[Section 3.H])
Ammonia Nitrogen
mg/L Summer
2.3 mg/L Summer
(NH3-N)
mg/L
mg/L
Ib/day
mg/L Winter
13.0 mg/L Winter
Biochemical
mg/L Summer
18.0 mg/L Summer
Oxygen Demand
300 mg/L
300 mg/L
810 Ib/day
(BODS)
mg/L Winter
30.0 mg/L Winter
Fecal Coliform
per 100 mL
200 per 100 mL
Nitrate + Nitrite
Nitrogen (NO3-N +
mg/L
mg/L
NO2-N)
Total Kjeldahl
mg/L
Nitrogen
mg/L
mg/L
Total Nitrogen
Ib/year
Ib/year
mg/L
mg/L
Total Phosphorus
mg/L
mg/L
Ib/day
Ib/year
Ib/year
Total Suspended
mg/L
mg/L
Ib/day
mg/L
30.0 mg/L
Solids (TSS)
3. Based on the "Project Basis of Design" parameters listed above, will the proposed design allow the treatment facility to
meet the NPDES Permit Limits listed above? ® Yes or ❑ No. If no, describe how and why the Permit Limits will not be
met:
4. Per 15A NCAC 02T.0505(*)., by-pass and overflow lines are prohibited. Is this condition met by the design? ® Yes or ❑ No
If no, describe the treatment units bypassed, why this is necessary, and where the bypass discharges:
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 6

North Carolina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
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.
Per 15A NCAC 02T .0505(0), 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(g), the public shall be prohibited from access to the wastewater treatment facilities. Explain how
the design complies with this requirement: Private Drive with Gate
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):
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 7
No. ofPlan
Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
(Yes or No)
Manual Bar Screen
MGD at peak hourly flow
Mechanical Bar
Shaftless Sprial
N/A
1
2.0 MGD at peak hourly flow
5, 6, 11
11040
Screen
Screen
Grit Removal
1
Vortex Unit
2.0 MGD at peak hourly flow
5, 6, 11
11050, 11060
N/A
w/Classifier
Flow Equalization
-
gallons
ft diameter; ft side
Primary Clarifier
water depth
square feet; ft side
Primary Clarifier
water depth
Other
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 7

Nbdh Carolina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
SECONDARY TREATMENT (BIOLOGICAL REACTORS AND CLARIFIERS) (i.e., biological and chemical processes to remove
organics and nutrients)
3. TERTIARY TREATMENT
No. of
Plan Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
(Yes or No)
Aerobic Zones/
Circular
ft diameter; ft
Tanks
(Parallel; in
gallons
Anoxic Zones/
series)
square feet; ft
Tanks
Rectangular
gallons
Anaerobic
(Gas;
gallons
Zones/Tanks
tablet; liquid)
square feet
Sequencing Batch
-
gallons
Reactor (SBR)
-
gallons
Membrane
-
gallons
Bioreactor (MBR)
gallons
Secondary Clarifier
Circular
ft diameter; ft
side water depth
Secondary Clarifier
Rectangular
square feet; ft
side water depth
Other
3. TERTIARY TREATMENT
4. DISINFECTION
No. of
Plan Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
(Yes or No)
Tertiary Clarifier
Circular
ft diameter; ft
Ultraviolet Light
(Parallel; in
side water depth
series)
square feet; ft
Tertiary Clarifier
Rectangular
side water depth
Tertiary Filter
(Gas;
square feet
Tertiary Membrane
tablet; liquid)
square feet
Filtration
(Gas;
gallons of contact
Post -Treatment
-
gallons
Flow Equalization
Post -Aeration
gallons
Other
4. DISINFECTION
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 8
No. of
Plan Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
(Yes or No)
gal/day per bank at
Ultraviolet Light
(Parallel; in
peak hourly flow;
series)
number of banks;
number of lamps/bank
Chlorination
(Gas;
gallons of contact
tablet; liquid)
tank/unit
Dechlorination
(Gas;
gallons of contact
tablet; liquid)
tank/unit
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 8

North Carolina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
5. RESIDUALS TREATMENT
6. PUMP SYSTEMS (include influent, intermediate, effluent, major recycles, waste sludge, thickened waste sludge and plant
drain pumps)
Location
No. of
Purpose
Type
Plan Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
35'
5 & 12
aerobic digester
(Yes or No)
Gravity Thickening
square feet; ft side
Tank
water depth
Mechanical
Thickening/
dry Ib/hour
Dewatering
Aerobic Digestion
2
Circular
243,998 gallons
Sheet 3
11030
Yes
Anaerobic
gallons
Digestion
Composting
dry Ib/hour
Drying
dry Ib/hour
Other
6. PUMP SYSTEMS (include influent, intermediate, effluent, major recycles, waste sludge, thickened waste sludge and plant
drain pumps)
Location
No. of
Pumps
Purpose
Type
Capacity of
each pump
plan Sheet
Reference
Specification
Reference
GPM
I TDH
Waste Sludge to
2
Waste Sluge
Submersible
247
35'
5 & 12
aerobic digester
7. MIXERS
Location
No. of
Mixers
Purpose
Type
Power of
each MP ixer
Plan Sheet
Reference
Specification
Reference
Digesters
2 (1 ea
tank)
Aeration
Surface
30
5, 10, 12
11000
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 9

North Cardina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
8. BLOWERS
Location
No. of
Blowers
purpose
Type
Capacity of
each Blower
(CFM)
plan Sheet
Reference
Specification
Reference
Treatment/Storage
Design? If "No", identify
Unit
Setback Waivers in Item D.2
Below
Any habitable residence or place of assembly under separate
100 ft
® Yes
❑ No
ownership or not to be maintained as part of the project site
Any private or public water supply source
100 ft
® Yes
❑ No
Surface waters (streams — intermittent and perennial, perennial
50 ft
® Yes
❑ No
waterbodies, and wetlands)
Any well with exception of monitoring wells
100 ft
® Yes
❑ No
Any property line
50 ft
® Yes
9. ODOR CONTROL
Location
No. of
Units
Purpose
Type
Plan Sheet
Reference
Specification
Reference
Setback Parameter
Treatment/Storage
Design? If "No", identify
Unit
Setback Waivers in Item D.2
Below
Any habitable residence or place of assembly under separate
100 ft
® Yes
❑ No
ownership or not to be maintained as part of the project site
Any private or public water supply source
D. SETBACKS —COMPLETE FOR NEW WASTEWATER TREATMENT STRUCTURES
The minimum distance for each setback parameter to the wastewater treatment/storage units per 15A NCAC 02T .0506(b)
are as follows:
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: N/A
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 10
Minimum Distance
Is Minimum Distance
Required from Nearest
Requirement met by the
Setback Parameter
Treatment/Storage
Design? If "No", identify
Unit
Setback Waivers in Item D.2
Below
Any habitable residence or place of assembly under separate
100 ft
® Yes
❑ No
ownership or not to be maintained as part of the project site
Any private or public water supply source
100 ft
® Yes
❑ No
Surface waters (streams — intermittent and perennial, perennial
50 ft
® Yes
❑ No
waterbodies, and wetlands)
Any well with exception of monitoring wells
100 ft
® Yes
❑ No
Any property line
50 ft
® Yes
❑ No
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: N/A
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 10

Nath Carolina Division of Water Resources State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
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:
I, Troy King, attest that this application package for an Authorization to Construct
(Typed Name of Professional Engineer)
for the Town of Yanceyville Wastewater Treatment Plant
(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 133-31 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 4.13.1 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 11

North Cxd4naState of North Carolina
Division of Water Resources Department of Environment and Natural Resources
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
SECTION 6: APPLICATION CERTIFICATION BY APPLICANT
Applicant's Certification per 158 NCAC 02T .0106(b):
I, Brian Collie —Town Managerattest that this application package for an Authorization to Construct
(Typed Name of Signature Authority and Title)
for the Town ofYancewille Waterwater Treatment Plant
(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 NCbAg 02T .0120(bl. the Applicant or any affiliate has not been convicted of environmental crimes,
has not abandoned a wastewater facility without proper closure, does not have an outstanding civil penalty where all
appeals have been abandoned or exhausted, are compliant with any active compliance schedule, and does not have any
overdue annual fees.
I understand that the Division of Water Resources' issuance of the Authorization to Construct Permit may be based
solely upon acceptance of the Licensed Professional Engineer's Certification contained in Section 5, and that the Division
may waive the technical review of the plans, specifications, calculations and other supporting documentation provided
in this application package. I further understand that the application package may be subject to a future audit.
I understand that in accordance with General Statutes 143.215.6A and 143.215.68 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 $10,0000, as well as civil penalties up to $25,000 per violation.
Signature: � 6210,Date: 1 — '? 9 — ) r
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 12

ENGINEERING CALCULATIONS
FOR
Town of Yanceyville-New Aerobic Digesters
Contract 1: General Construction
OWNER: Town of Yanceyville
Yanceyville, North Carolina
Prepared by:
alley, williams, carmen & king, inc.
engineers and architects
740 chapel hill road - post office box 1179
burlington, north carolina 27216-1179
CDBG Project -16-I-2730
September 6, 2018
Project No. 15080
Set No.
11 Page

Table of Contents
Page
Summary 2
A. Aerobic Digester Design Data 3
B. Solids Storage Tank 6
C. Aerator Equipment 6
D. Solids Transfer Pump to Digester 6
E. Solids Thickening 6
F. Flow Equalization to Chlorine Contact Tank 7
G. Auxiliary Power 7
H. Estimate of Probable Cost 8
Exhibit 1- Supplemental information on Vortex Flow Control Valve
21 Page

Summary
The Town of Yanceyville owns and operates a wastewater treatment plant located at
the southern terminus of Pine Drive. The plant was first built at this location in
1960 and was last upgraded in 1994 as a Sequencing Batch Reactor (SBR) plant
and is currently permitted for 0.45 MGD of flow. Structurally, the plant appears to
be in good physical condition although some SBR plant components are now 20
years old, while the existing sludge storage lagoon is 54 years old.
The SBR (Sequencing Batch Reactor) plant has generally provided good treatment
over the years. There has been some discharge violations over the past several
years and the Town has been issued Notices of Violations. Most of the permit
violations relate to exceeding the effluent disinfection standards (fecal count).
With this exception, the plant has generally met effluent standards. The violations
are attributed in some instances to equipment malfunction and high peaks flows
going through the chlorine contact chamber. The project includes installing a flow
control device in the flow equalization chamber to help reduce peak flows going
to the chlorine contact chamber. This will improve the chlorine contact time and
lead to better effluent disinfection which will help the plant provide consistent
permit compliance.
Waste biological solids from the treatment plant are stored in an old lagoon at the site
and are removed periodically (usually 3-4 years) and disposed of using the Town's
approved land application program. This type of solids storage is not now a generally
accepted use and there is currently a trend to eliminate this type of device with the recent
storage lagoon leaks.
The Yanceyville wastewater treatment plant project consists of the following major
items:
1- 60 ft. diameter aerobic digesters with 30 HP floating aerator/decanter
1- 60 ft. diameter sludge storage tank with 30 HP floating aerator/decanter
2- Waste sludge pumps/piping to pump solids from the SBR to the Digesters
1- Sludge loading platform
1- Effluent flow control device from the Equalization tank to the chlorine contact
basins
Upon completion of the New Aerobic Digesters, draining and closing of the old
sludge lagoon after an extended drying time.
31 Page

As the project does not affect the design flow capacity, the engineering calculations
are provided for the new items proposed for construction. These are summarized as
follows:
A. Aerobic Diaester Desian Data
Design Data:
Influent BOD = 300 mg/I, Lbs./day = 300 X 8.34 X 0.45 MGD= 810
Lb./day
Lbs. of sludge/day = Lb. BOD X 0.72 = 810 Lb./day
Sludge Flow to digesters based on 1 % solids =
810/0.01/8.34 = 9,712 gallons/day wasted from
Temperature = 30°C (summer, assumed)
= 20°C (winter, assumed)
Scope:
Recommended size of tanks required and aerator in each of two
tanks. One is for aerobic digester and the other is sludge holding.
Assume sludge is thickened to 2.0%.
Calculations:
Hydraulics Retention Time
According to the US Environmental Protection Agency's Process
Design for Sludge Treatment and Disposal from September 1979,
a 44% VSS reduction requires,
800°C —days = Temperature x SRT
SRT = 800/20
SRT = 40 days
TSS Loading
TSS Loading = 10000 mg/1 x0.009712 MGD x 8.34
= 810 Ib TSS/day
Volume Needed
Assume that the sludge is thickened to 2.0% TSS (20,000 mg/1)
through settling and dewatering.
Volume = 810 Ib TSS / day x 40 days
0.02 x 8.34
= 194,245 gal
4

= 0.20 MG
26,667 W
Recommended Digester Dimensions
Diameter = 60 ft
Water Depth = loft
Volume = 0.21 MG
Actual Oxygen Requirement
It is assumed that the influent VSS concentration is 70% and 2 Ib 02
/lb VSS reduced is used to determine the oxygen demand.
AOR = 2 Ib/Ib x 810 Ib/day x 0.7 x 0.44 x 1 day /24
hr
= 20.76 Ib 022/hr
Field Oxygen Transfer Efficiency
FTE = SOTE x HCs x 13) — Crl x 1.024 (T-20) x a
9.09
Where:
SOTE
= 2.8 Ib 02 / BHP -hr
T
= 300C
Cs
= 7.39 mg/I (30oC and 600 ft)
R
= 0.95 (typical, assumed)
a
= 0.85 (typical, assumed)
Cr
= 2.0 mg/I
FTE
= 1.67 Ib 02/BHP-hr
Power Requirement
Power (aeration) _
20.76 Ib/hr
1.67 Ib/BHP-hr x 0.92
13.5 HP
A mixing level of 150 Hp/MG is recommended to provide complete mix
conditions.
Power (mixing) = 150 HP/MG x 0.20 MG
= 30 HP
This leads to a recommendation of one (1) — 30 HP aerator.
Recommendation:
One (1) — 30 HP aerator and restrained mooring is recommended in each of
the two tanks. Therefore a total of two (2) — 30 HP aerators with and
restrained mooring are required.
51 Page

Based on the above, one (1) 60 ft. diameter
digester is recommended. Provide actual
freeboard and splash protection.
B. Solids Storage Tank
X 10.0 ft. sidewater depth aerobic
sidewall depth of 12 ft. minimum as
It is recommended that a solids storage tank of equal size to the aerobic digester
be provided to store stabilized solids prior to land application (60 ft. diameter).
C. Floating Aerator Equipment
It is recommended that one (1) 30 HP floating aerator be provided in the digester
and storage tank to provide aeration and mixing as indicated on Page 5.
D. Solids Transfer Pump to Digester
Waste solids from the SBR process will need to be transferred to the aerobic
digester. The existing SBR plant currently has a 247 GPM at 18 TDH
submersible sludge pump in each SBR basin that pumps to the sludge
lagoon. As the digesters are at a higher elevation than the lagoon, it is
recommended that the existing pumps be replaced with new 247 GPM
pumps, but that operate at 35 Ft. TDH calculated as follows:
1. Static head
High water elevation in Digester
522.50
Water elevation in SBR at pumping
-494.00
Total Static Head
28.50 ft.
2. Friction Head (using c=120 at 247 GPM)
15 ft. 3" pipe (pump to walkway) Hf
2.90 ft.
385 ft. 6" to digester Hf
2.50 ft.
Misc.
1.10 ft.
Total Dynamic Head 35.00 ft.
The existing pumps are 3 HP. It is proposed for new 5 HP pumps be provided.
The existing SBR controls and wiring are sufficient for this change.
E. Solids thickening in Digester and Decanting
As solids are wasted from the SBR process, they will be aerated and stabilized it
the aerobic digester. It is assumed that waste solids from the SBR process
will be about 1 % solids. As the digester fills, the aerator will be occasionally
shut off to allow solids to settle. After an appropriate settling time (1-2 hours),
supernatant will be removed from the digester by a gravity decanter.
Supernatant will be returned to the head of the plant. Solids are anticipated to
613age

thicken to the 2% range prior to transferring to the Solids Storage Tank.
Following solids stabilization, liquid sludge will be loaded into tanker trucks (at
a new loading station) prior to land application.
F. Flow Equalization to Chlorine Contact Chamber
The SBR tankage has a flow equalization tank with a gravity flow piping
arrangement for flow equalization. The gravity flow arrangement has not
resulted in efficient flow equalization; therefore, it is recommended that a flow
control valve be provided to improve flow equalization to the chlorine contact
chamber to address effluent discharge violations that relate to fecal coliform
violations. A vortex valve is proposed to better equalize the flows to the
chlorine contact tank to improve disinfection performance. The current
permitted design capacity of the WWTP is 0.45 MGD average flow with a
peak design flow of 1.2 MGD. It is recommended that a vortex valve providing
approximately 800-850 GPM flow in a 2-5 ft. head range be installed to
maximize chlorine contact time as the effluent flows through the contact
chamber. In event of high water in the EQ tank, the vortex valve will allow
higher flows at higher heads.
The existing SBR process is designed for a peak flow of 1,200,000 GPD, or 6
cycles per day through the 2 SBR tanks during a storm mode. Normal
operations are 4 cycles per day for each SBR tank. As the SBR tanks
progress through their various aeration, mixing, and settling cycles, at the end
of the settling phase, decant is removed from the SBR unit at the rate of
2,000 GPM to the equalization tank. This decant (or settled water) is really the
plant effluent prior to disinfection and flows to the equalization tank. The
proposed vortex valve is intended to control the flow rate to the chlorine
contact tank to provide for a minimum chlorine contact time of 15 minutes.
The chlorine contact tank has a volume of 12,726 gallons. At a flow rate of
850 GPM, the chlorine contact tank has a contact time of 15 minutes.
As a part of the retrofit of the flow device, the existing 30 degree V -Notch weir in
the stilling well will be changed to a 90 degree V -Notch weir to lower the
water level in the stilling well at the design flow to improve the hydraulics
thorough the equalization tank.
Additional information on use of Vortex Valves for flow control is attached as
Exhibit 1.
G. Auxiliary Power
The Yanceyville WWTP currently has a 60KW standby generator on site that
is used to operate the influent pump station during a power failure. The
generator has capacity to operate the influent pump station to pump
wastewater to the SBR unit. The existing generator does not have the

capacity to operate the equipment within the SBR unit, so in the event of a
power outage, settled water would overflow the SBR unit to the lagoon.
The proposed design includes a new 30OKW generator designed to power
the influent pump station, as well as the SBR equipment during a power
outage (see electrical plans for load information). In addition, the design calls
for the existing 60KW generator to be relocated and used to power the
digesters during a power outage.
Utilizing the existing 60KW generator, which is in good working condition,
helped reduce the size and cost of the generator required to operate the
remaining equipment on site.
At the completion of the project, the WWTP will be fully operational during a
power outage using the two generators. As a result, use of the lagoon during
power outages will no longer be required.
H. Estimate of Probable Cost
The construction cost of the improvements included within the bid
documents is estimated at $1,575,455.00.
8l Page