NC0057151_Authorization to Construct_20171205

McGill
A S S O C 1 A T G S
December 5, 2017
RECEIVEDIDENRIDWR
DEC 0 7 2017
Mr. Ron Berry Water Resources
North Carolina Department of Environmental Quality
Permitting Section
NPDES Complex Permitting
512 North Salisbury Street (9th Floor Archdale Building)
Raleigh, North Carolina 27604
Re: Request for Authorization to Construct
Mars Hill WWTP Improvements
Town of Mars Hill
Madison County, North Carolina
Dear Mr. Berry:
The Town of Mars Hill hereby requests Authorization to Construct the referenced
proposed improvements at the Mars Hill wastewater treatment plant (NPDES NCO057151) as
shown and specified in the enclosed plans, specifications and other supporting documents
prepared. This submittal includes one hard copy and one digital copy of the following:
• Application for Authorization to Construct Permit (Form ATC -12-14)
• Engineering plans for the proposed improvements
• Engineering specifications for the proposed improvements
• Engineering calculations for the proposed improvements
If you have any questions or we can provide any additional information, please contact me
at [e-mail] or by telephone at 828-252-0575, extension 177.
Sincerely,
McGILL ASSOCIATES, P.A.
)W-0
Michael Whittenburg, E.I.
Engineering Associate
Enclosures
cc: Darhyl Boone, Town of Mars Hill
Mike Dowd, McGill Associates
I \Projects\2015\15 00325\Letters\rb5dec17ncdwr docx
55 Broad Street P O Box 2259 ph 828 252 0575
Asheville North Carolina 28801 Asheville, North Carolina 28802 f 828 252 2518 www mcgillengmeers corn

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
SECTION 1: INSTRUCTIONS AND INFORMATION
A. The Division of Water Resources will accept this application package for review only if all of the items are provided and the
application is complete Failure to submit all of the required Items will result in the application package being returned as incomplete
per 15A NCAC 02T .0105(b).
B. Plans and specifications must be prepared in accordance with 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina General Statute
133-3, North Carolina General Statute 143-215.1, and Division of Water Resources Minimum Design Criteria for NPDES
Wastewater Treatment Facilities
C. The plans and specifications submitted must represent a completed final design that is ready to advertise for bid.
D. Any content changes made to this Form ATC -12-14 shall result in the application package being returned.
E. The Applicant shall submit ONE ORIGINAL and ONE DIGITAL COPY (CD) of the application, all supporting documentation and
attachments All information must be submitted bound or in a 3 -ring binder, with a Section tab for each Section, except the
Engineering Plans
F. Check the boxes below to indicate that the information is provided and the requirements are met
G. If attachments are necessary for clarity or due to space limitations, such attachments are considered 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: https://deg.nc.gov/about/divisions/water-resources/water-
resources-perm its/wastewater-branch/npdes-wastewater/authorization-to-construct
J. In addition to this Authorization to Construct, the Applicant should be aware that other permits may be required from other Sections
of the Division of Water Resources (for example: reclaimed water facilities permits, Class A or B biosolids residuals permit)
SECTION 2: APPLICANT INFORMATION AND PROJECT DESCRIPTION
A. APPLICANT
Applicant's name
Town of Mars Hill
Signature authority's name per 15A NCAC 02T .0106(b)
Darhyl Boone
Signature authority's title
Town Manager
Complete mailing address
280 South Main Street, Mars Hill, NC, 28754
Telephone number
828-689-2301
Email address
[e-mail]
B. PROFESSIONAL ENGINEER
Professional Engineer's name
Mike Dowd, PE
Professional Engineer's title
Senior Project Manager
North Carolina Professional Engineer's License No
024487
Firm name
McGill Associates, PA
Firm License number
C-0459
Complete mailing address
55 Broad Street, Asheville, NC 28801
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 1

Water Resources
ENVIRONMENTAL QUALITY
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
Telephone number
828-252-0575
Email address
[e-mail]
C. NPDES PERMIT
NPDES Permit number
NCO057151
Current Permitted flow (MGD) — include permit
0.425
flow phases if applicable
D. PROJECT DESCRIPTION
Provide a brief description of the project. This prosect consists of concrete basin repairs, the installation of variable frequency
drives with automatic controls on two existing 75 hp blowers to improve basin aeration and the installation of one additional 5
hp blower and associated air piping modifications necessary to permit four existing return/waste activated sludge air lift pumps
to be operated independently of basin aeration
SECTION 3: APPLICATION ITEMS REQUIRED FOR SUBMITTAL FOR ALL PROJECTS
A. Cover Letter
® The letter must include a request for the Authorization to Construct, the facility NPDES Number; a brief project description
that indicates whether the project is a new facility, facility modification, treatment process modification, or facility expansion,
the construction timeline, and a list of all items and attachments included in the application package.
® If any of the requirements of 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina General Statute 133-3. North Carolina
General Statute 143-215.1, and Division of Water Resources Minimum Design Criteria for NPDES Wastewater Treatment
Facilities are not met by the proposed design, the letter must include an itemized list of the requirements that are not met.
B. NPDES Permit
® Submit Part I of the Final NPDES permit for this facility that includes Part A (Effluent Limitations and Monitoring Requirements)
for the monthly average flow limit that corresponds to the work that is requested for this project.
C. Special Order by Consent
❑ If the facility is subject to any Special Orders by Consent (SOC), submit the applicable SOC.
® Not Applicable
D. Finding of No Significant Impact or Record of Decision
❑ Submit a copy of the Finding of No Significant Impact or Record of Decision for this project
❑ Provide a brief description of any of the mitigating factors or activities included in the approved Environmental Document
that impact any aspect of design of this project, if not specified in the Finding of No Significant Impact or Record of Decision.
® Not Applicable.
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 2

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
E. Engineering Plans
® Per 15A NCAC 02T .0504(c)(1), submit one set of detailed plans that have been signed, sealed and dated by a North Carolina
Licensed Professional Engineer.
® Per 21 NCAC 56.1103(a)(6), the name, address and License number of the Licensee's firm shall be Included on each sheet of
the engineering drawings.
® Plans must be labeled as follows FINAL DRAWING —FOR REVIEW PURPOSES ONLY— NOT RELEASED FOR CONSTRUCTION.
® 15A NCAC 02H .0124 requires multiple (dual at a minimum) components such as pumps, chemical feed systems, aeration
equipment and disinfection equipment. Is this requirement met by the design? ® Yes or ❑ No. If no, provide an
explanation -
Plans shall include:
® Plans for all applicable disciplines needed for bidding and construction of the proposed project (check as appropriate)-
® Civil ❑ Not Applicable
® Process Mechanical ❑ Not Applicable
❑ Structural ® Not Applicable
® Electrical ❑ Not Applicable
® Instrumentation/Controls ❑ Not Applicable
❑ Architectural ® Not Applicable
❑ Building Mechanical ®Not Applicable
❑ Building Plumbing ®Not Applicable
® Plan and profile views and associated details of all modified treatment units Including piping, valves, and equipment (pumps,
blowers, mixers, diffusers, etc.)
® Are any modifications proposed that Impact the hydraulic profile of the treatment facility? ❑ Yes or ® No If yes, provide
a hydraulic profile drawing on one sheet that Includes all Impacted upstream and downstream units. The profile shall Include
the top of wall elevations of each impacted treatment unit and the water surface elevations within each Impacted treatment
unit for two flow conditions: (1) the NPDES permitted flow with all trains In service and (2) the peak hourly flow with one
treatment train removed from service
® Are any modifications proposed that impact the process flow diagram or process flow schematic of the treatment facility?
❑ Yes or ®No If yes, provide the process flow diagram or process flow schematic showing all modified flow paths Including
aeration, recycle/return, wasting, and chemical feed, with the location of all monitoring and control Instruments noted.
F. ® Engineering Specifications
® Per 15A NCAC 02T .0504(c)(2), submit one set of specifications that have been signed, sealed and dated by a North Carolina
Licensed Professional Engineer.
® Specifications must be labeled as follows FINAL SPECIFICATIONS — FOR REVIEW PURPOSES ONLY — NOT RELEASED FOR
CONSTRUCTION.
Specifications shall include:
® Specifications for all applicable disciplines needed for bidding and construction of the proposed project (check as
appropriate):
® Civil ❑ Not Applicable
® Process Mechanical ❑ Not Applicable
❑ Structural ® Not Applicable
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 3

State of North Carolina
Department of Environmental Quality
Division of Water Resources
K4-r
� 0.
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
® Electrical ❑ Not Applicable
® Instrumentation/Controls ❑ Not Applicable
❑ Architectural ® Not Applicable
❑ Building Mechanical ® Not Applicable
❑ Building Plumbing ® Not Applicable
® Detailed specifications for all treatment units and processes including piping, valves, equipment (pumps, blowers, mixers,
diffusers, etc ), and instrumentation.
® Means of ensuring quality and integrity of the finished product including leakage testing requirements for structures and
pipelines, and performance testing requirements for equipment.
® Bid Form for publicly bid projects.
G. Construction Sequence Plan
® Construction Sequence Plan such that construction activities will not result in overflows or bypasses to waters of the State.
The Plan must not imply that the Contractor is responsible for operation of treatment facilities. List the location of the
Construction Sequence Plan as in the Engineering Plans or in the Engineering Specifications or in both: Specifications section
C-700.
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 4.6.2 of this form were
determined
❑ Pollutant loading for each treatment unit demonstrating how the design effluent concentrations in Section 4.13.2 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 (N/A)
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 4
Permit/
If Not Issued Provide
Not
Date
Date
Certification
Status and Expected
Permit/Certification
Applicable
Submitted
Approved
Number
Issuance Date
Dam Safety
n/a
Soil Erosion and Sediment Control
n/a
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 4

J.
Water Resources
ENVIRONMENTAL QUALITY
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
USCOE /Section 404 Permit
n/a
Water Quality Certification (401)
n/a
USCOE /Section 10
n/a
Stormwater Management Plan
n/a
CAMA
n/a
NCDOT Encroachment Agreement
n/a
Railroad Encroachment Agreement
n/a
Other:
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(i) and 15A NCAC 02T
.0508, the Plan must include:
❑ A detailed explanation as to how the generated residuals (including trash, sediment and grit) will be collected, handled,
processed, stored, treated, and disposed.
❑ An evaluation of the treatment facility's residuals storage requirements based upon the maximum anticipated residuals
production rate and ability to remove residuals.
❑ A permit for residuals utilization or a written commitment to the Applicant from a Permittee of a Department approved
residuals disposal/utilization program that has adequate permitted capacity to accept the residuals or has submitted a
residuals/utilization program application
❑ If oil, grease, grit or screenings removal and collection is a designated unit process, a detailed explanation as to how the
oil/grease will be collected, handled, processed, stored and disposed.
® Not Applicable
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 5

Water Resources
ENVIRONMENTAL QUALITY
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
SECTION 4: PROJECT INFORMATION
A. WASTEWATER TREATMENT PLANT FLOW INFORMATION —COMPLETE FOR NEW OR EXPANDING FACILITIES
1. Provide the following flow information:
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 6
Plant Flows
Existing Plant Design
MGD
Current NPDES Permit Limit
MGD
Current Annual Average
(past 12 months)
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 6

State of North Carolina
i+y
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
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? 0 Yes or 0 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:
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? 0 Yes orE] No. If no, describe how and why the Permit Limits will not be
met,
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 7
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
mg/L Summer
(NH3-N)
mg/L
mg/L
Ib/day
mg/L Winter
mg/L Winter
Biochemical
mg/L Summer
mg/L Summer
Oxygen Demand
mg/L
mg/L
Ib/day
(BODS)
mg/L Winter
mg/L Winter
Fecal Coliform
per 100 mL
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
mg/L
Solids (TSS)
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? 0 Yes orE] No. If no, describe how and why the Permit Limits will not be
met,
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 7

Wafer Resources
ENVIRONMENTAL QUALITY
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
4. Per 15A NCAC 02T .0505('1, 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.050501, 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(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 The prosect area is located within the existing gated WWTP
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
PRELIMINARY AND PRIMARY TREATMENT (i e, physical removal operations and flow equalization):
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)
Manual Bar Screen
MGD at peak hourly flow
Mechanical Bar
MGD at peak hourly flow
Screen
Grit Removal
MGD at peak hourly flow
Flow Equalization
--
gallons
ft diameter; ft side
Primary Clarifier
Circular
water depth
Primary Clarifier
Rectangular
square feet; ft side
water depth
Other
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 8

Water Resources
ENVIRONMENTAL QUALITY
State of North Carolina
Department of Environmental Quality
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
Type
Size per Unit
Plan Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
gal/day per bank at
(Yes or No)
Aerobic Zones/
(Parallel; in
gallons
Tanks
Circular
side water depth
Anoxic Zones/
gallons
Tanks
Rectangular
side water depth
Anaerobic
tablet; liquid)
gallons
Zones/Tanks
square feet
Sequencing Batch
--
gallons
Reactor (SBR)
--
gallons
Membrane
--
gallons
Bioreactor (MBR)
Post -Aeration
ft diameter; ft
Secondary Clarifier
Circular
side water depth
square feet, ft
Secondary Clarifier
Rectangular
side water depth
Other
3. TERTIARY TREATMENT
4. DISINFECTION
Treatment Unit
No. of
Type
Size per Unit
Plan Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
gal/day per bank at
(Yes or No)
Ultraviolet Light
(Parallel; in
ft diameter, ft
Tertiary Clarifier
Circular
side water depth
square feet; ft
Tertiary Clarifier
Rectangular
side water depth
Tertiary Filter
tablet; liquid)
square feet
Tertiary Membrane
square feet
Filtration
Post -Treatment
--
gallons
Flow Equalization
Post -Aeration
gallons
Other
4. DISINFECTION
Treatment Unit
No. of
Type
Size per Unit
Plan Sheet
Specification
Calculations
Provided?
Units
Reference
Reference
(Yes or No)
gal/day per bank at
Ultraviolet Light
(Parallel; in
peak hourly flow;
series)
number of banks;
number of lamps/bank
(Gas;
gallons of contact
Chlorination
tablet; liquid)
tank/unit
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 9

Water Resources
ENVIRONMENTAL QUALITY
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
Dechlorination
No. of
(Gas,
gallons of contact
I
Plan Sheet
Specification
Calculations
Treatment Unit
Units
tablet, liquid)
tank/unit
Reference
Reference
Provided?
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?
n/a
C-103 & 104
n/a
(Yes or No)
Gravity Thickening
square feet; ft side
Tank
water depth
Mechanical
Thickening/
dry Ib/hour
Dewatering
Aerobic Digestion
gallons
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
TDH
clarifiers
4
return/waste sludge
air lift
220
n/a
C-103 & 104
n/a
7. MIXERS
Location
No. of
Mixers
Purpose
Type
Power of
ixer
each MP)
plan Sheet
Reference
Specification
Reference
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 10

Wa ter Resources
ENVIRONMENTAL QUALITY
8. BLOWERS
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
Location
No. of
Blowers
purpose
Type
Capacity of
each Blower
(CFM)
plan Sheet
Reference
Specification
Reference
Clarifier 2
1
drive sludge air lifts
positive
displacement
50
C-103 & 104
113760
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 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
1 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 11
Minimum Distance
Is Minimum Distance
Required from Nearest
Requirement met by the
"No",
Setback Parameter
Treatment/Storage
Design? If 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 11

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
SECTION 5: APPLICATION CERTIFICATION BY PROFESSIONAL ENGINEER
Professional Engineer's Certification per 15A NCAC 02T.0105:
I, Mike Dowd, attest that this application package for an Authorization to Construct
(Typed Name of Professional Engineer)
for the Mars Hill 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 133-3, 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 4.13.1 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 dted:
JIM I i
SEAL
024487
EL Z.O��y �
I (!�14
Application for Authorization to Construct Permit (FORM ATC -12-14) Page 12

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC -12-14)
SECTION 6: APPLICATION CERTIFICATION BY APPLICANT
Applicant's Certification per 15A NCAC 02T .0106(b):
I, Darhvl Boone, Town Manager, attest that this application package for an Authorization to Construct
(Typed Name of Signature Authority and Title)
for the Mars Hill Wastewater 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 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.
I understand that in accordance with General Statutes 143-215.6A and 143-215.6B any person who knowingly makes
any false statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor,
which may include a fine not to exceed $10,000, as well as civil penalties up to $25,000 per violation.
Signature: Date: IA— V-17
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 13

rM
Permit NCO057151
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 provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, ,as amended,
Town of Mars Hill
is hereby authorized to discharge wastewater from a facility located at the
Mars Hill Wastewater Treatment Plant (WWTP)
504 Cascade Street, Mars Hill
Madison County
to receiving waters designated as Gabriel Creek in the French Broad 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 March 1, 2016.
This permit and authorization to discharge shall expire at midnight on September 30, 2 02 0.
Signed this day February 2, 2016.
m C•,�
y Zimmerman, P. G., Direet+gf---
ivision of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 5

Permit NCO057151
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked. As of this permit issuance, any previously issued permit bearing this number is no longer
effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the
permit conditions, requirements, terms, and provisions included herein.
Town of Mars Hill
is hereby authorized to:
1. continue to operate an existing 0.425 MGD wastewater treatment system consisting of
following treatment components:
• comminutor
• bar screen
• grit removal chamber
• flow meter with totalizer
• three (3) aeration tanks
• clarifier
• aerobic digestor with sludge return
• chlorine -contact tank
• sludge drying beds
• standby power supply
these facilities located at the Mars Hill WWTP, 504 Cascade Street, Mars Hill, Madison
County, and
2. discharge from said treatment works via Outfall 001, at the location specified on the attached
map, into Gabriel Creep [Stream Segment 6-96-12], a waterbody currently classified C within
subbasin 04-03-04 [HUC: 06010105] of the French Broad River Basin.
Page 2 of 5

' . r
PART I
Permit NCO057151
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq.; 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited, monitored and
reported 1 by the Permittee as specified below:
_ 'EFFLUENT 4 , , ,
LIlVIITS
MONTI'ORYNG
`REQUI)ttEMENTS
CHARACTERISTICS
_ "
Monthly
Weekly
Daily ,
Measurement
Simple'
Sample
(Parameter Codes)
Average
Average.
Maximum
Frequencyr
Type .
Location 2
Flow
00500
0.425 MGD
Continuous
Recording
I or E
Total Residual Chlorine 3
C0530
17 pg/L
2/Week
Grab
E
BOD, 5 -day (20°C) 4
C0310
30.0 mg/L
45.0 mg/L
Weekly
Composite
I & E
Total Suspended Solids 4
C0530
30.0 mg/L
45.0 mg/L
Weekly
Composite
I & E
Dissolved Oxygen
00300
Daily Ave. > 5.0 mg/L
Weekly
Grab
E
Temperature (°C)
00010
Weekly
Grab
E
NH3 as N
(April 1— October 31)
C0610
2.0 mg/L
6.0 mg/L
Weekly
Composite
E
NH3 as N
(November 1 — March 31)
C0610
4.0 mg/L
12.0 mg/L
Weekly
Composite
E
Fecal Coliform
(geometric mean)
31616
200/100 ml
400/100 ml
Weekly
Grab
E
pH
00400
Not < 6.0 or > 9.0 Standard Units
Weekly
Grab
E
Total Nitrogen
(NO2+NO3+TKN)
C0600
Semi -Annually
Composite
E
Total Phosphorus
C0665
Semi -Annually
Composite
E
Dissolved Oxygen
00300
Weekly
Grab
U & D
Temperature (°C)
00100
Weekly
Grab
U & D
Footnotes:
1. Beginning no later than 270 days from the effective date of this permit, the Permittee shall submit
discharge monitoring data electronically using the NCDWR's Electronic Discharge Monitoring Report
(eDMR) internet application [see Section A. (2.)].
2. E = Effluent; I = Influent; U = Upstream 50 ft from the outfall; D = Downstream two (2) miles at NCSR 1559
3. Total Residual Chlorine (TRC) - The Division shall consider compliant all effluent TRC values reported below
50 pg/L. However, the Permittee shall continue to record and report all values detected by North Carolina -
certified test methods (including field certified), even if these values fall below 50 pg/L.
4. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective
influent value (i.e., 85% removal required).
Condition: This discharge shall contain of floating solids or foam.
Page 3 of 5

Permit NCO057151
A. (2.) ELECTRONIC REPORTING - DISCHARGE MONITORING REPORTS
[GS. 143-215.1(b)]
Proposed federal regulations require electronic submittal of all discharge monitoring reports (DMRs)
and specify that, if a state does not establish a system to receive such submittals, then Permittees must
submit DMRs electronically to the Environmental Protection Agency (EPA).
NOTE: This special condition supplements or supersedes the following Sections within Part Il 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 [Supersedes Section D. (2.) and Section E. (5.) (a)1
Beginning no later than 270 days from the effective date of this permit, the Permittee shall submit
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. Until such time that the state's
eDMR application is compliant with EPA's Cross -Media Electronic Reporting Regulation
(CROMERR), Permittees will be required to submit all discharge monitoring data to the state
electronically using eDMR and will be required to complete the eDMR submission by printing,
signing, and submitting one signed original and a copy of the computer printed eDMR to the
following address:
NCDEQ / DWR / Information Processing Unit
ATTENTION: Central Files / eDMR
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a Permittee is unable to use the eDMR system due to a demonstrated hardship, or due to the
facility being physically located in an area where less than 10 percent of the households have
broadband access, then a temporary waiver from the NPDES electronic reporting requirements may
be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1,1.1, 2, 3)
or alternative forms approved by the Director. Duplicate signed copies shall be submitted to the
mailing address above.
Requests for temporary waivers from the NPDES electronic reporting requirements 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 using eDMR. Temporary waivers shall be
valid for twelve (12) months and shall thereupon expire. At such time, DMRs shall be submitted
electronically to the Division unless the Permittee re -applies for and is granted a new temporary
waiver by the Division.
Page 4 of 5

Permit NC0057151
Information on eDMR and application for a temporary waiver from the NPDES electronic reporting
requirements is found on the following web page:
hq://portal.NCDEO.ordweb/wg/admin/bog//iyu/edmr
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.
2. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes
Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part
11, Section B. (I 1.)(a), or by a duly authorized representative of that person as described in Part H,
Section B. (11.)(b). A person, not an assigned 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://portal.NCDEO.or web/wq/admin/bog ipu/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall
make the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF
CERTIFICATION WILL BE ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations. "
3. Records Retention [Supplements Section D. (6.)1
The Permittee shall retain records of all Discharge Monitoring Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years from the
date of the report. This period may be extended by request of the Director at any time [40 CFR
122.41].
Page 5 of 5

DESIGN CALCULATIONS
SEWER SYSTEM LVIPROVEMENTS
WWTP AND I-26 INTERCHANGE
TOWN OF MARS HILL
MADISON COUNTY, NORTH CAROLINA
CA&0
OQ.o�Essio.�,-y
MIKE DOWD, PE SEAL
024487 =
N
GINE�•� �
ChNAEL TV
McGill
ASSOCIATES
Engineering • Planning • Finance
Asheville, North Carolina
NOVEMBER 2017

WWTP Design Flow:
NPDES Permit No. NC0057151
Discharge Limit = Design Daily Flow = ddf = 425,000 gallons/day (295
gallons/minute)
Average Annual Daily Discharge = 160,000 gallons/day (I 11 gallons/minute)
Design Return Activated Sludge Flow:
Return Activated Sludge Flow = 50% to 150% of design average flow per Ten State
Standards 92.41
RAS Q =148 to 443 gallons/minute (37 to 111 gpm per sludge eductor)
Return Sludge Pipe Capacity
The controlling (smallest, and longest) return sludge line connects Clarifier #2 to the
digester. This return sludge line must be capable of carrying half of the RAS, or up to 222
gpm.
Pipe Diameter = 6 inches
Inlet elevation = 2201.99'
Outlet elevation = 2202.15'
Length = 20.68 feet
oz.ls—z2o199
Slope = 2z = 0.0077
2068
RH = diameter (in) = 6 = 0.125
48 48
1.486 2 1 1.486 2 1 ft
V — 0.013 X (RHP X S2 — 0.013 x (0.125)3 x (0.0077)z = 2.51 s
ft'R( Z)Z ft3 x7.48 gall (,60s
1Q = VA = 2.51 X =0.49s l ft3 J minl = 222 gpm
Air Lift Pump Capacity
The previous Authorization to Construct application for the WWTP expansion sized the
sludge holding basin's blower at 225 cfin, with 200 cfin required for basin aeration and 25
cfin to operate two sludge air lift pumps. Consequently, 50 cfin should operate four air lift
PUMPS.
The McGraw Hill Pump Handbook, 1St ed. by Karassik, Messina, Krutzsch, & Fraser states
that —0.15 cfin is required to pump 1 gpm for an air lift pump with a Head/Submergence
2

ratio of 0.4. The amount of liquid that can be pumped per cfin increases as H/S ratio
decreases, implying that for this application, the air required should be less than 0.15
cfm/gpm.
Head= 3 ft
Submergence = 17.3 ft (according to original design drawings)
H/S Ratio = 0.17
443 gpm - 4 air lift pumps =111 gpm/pump
50 cfm _ 4 air lift pumps =12.5 cfin/pump
12.5 cfm_ cfm
111 gpm 0.11 gpm
Transactions of the American Institute of Mining and Metallur 'cgY al Engineers Vol. 63, p.
444 discusses calculating air requirements in the article "Unwatering a Mine by Air -Lift,"
and gives an air lift formula attributed to the Ingersoll-Rand Co. as follows:
Li = length of the lift section (ft) = 3
LS = length of the submerged section (ft) = 17.3
C = constant that depends on Ll (given as 245 for 10-60 ft of lift) = 245
0.8L1 _ 0.8(3) CFM
_
Va Clo LS +34 24510 17.3+34) = 0.055 gal
910 ( 34 ) 910 ( 34
Air= 0.055 cFM x 443 gal = 24.3 CFM
gal mtn
While it may not be appropriate to extrapolate given that this formula is meant for a
minimum lift of 10 ft, this result as well as the previous citation suggests that a total of 50
CFM should be at least adequate for the return sludge flow required.
Air Lift Pump Discharge Pressure
While the intake of the sludge eductors extends almost to the full depth of the sludge
hoppers, the proposed PD blower will discharge into sludge eductors at a depth of
approximately 12 feet according to design drawings.
12 ft depth
= 5.2 psi
2.31psi
Head loss through blower silencer, inlet filter, air piping and fittings = 0.5 psi
Pressure = 5.2 psi + 0.5 psi = 5.7 psi = 6.0 psi
3

Main Aeration Blower VFD Controls
As the aeration basins are currently operated, dissolved oxygen in aeration basin #3 is
frequently observed to be 3.0 mg/1 or higher. Operators would prefer to maintain dissolved
oxygen concentrations closer to the 2.0 mg/l minimum stated in Ten State Standards 92.33.
The main blowers for the plant are two 75 hp Roots 616J blowers driven by 1750 rpm
motors with belts and pulleys
Motor pulley dia. = 18"
Blower pulley dia. =13"
Blower speed =1750 rpm( -13"1) = 2420 rpm
Pressure at the blowers will be the sum of piping losses, water pressure at the diffusers,
and head loss through the diffusers.
Diffuser depth= 11.25 ft
11.25 ft depth
= 4.87 psi
2.31 psi
Head loss through coarse bubble diffusers = 0.5 psi
Head loss through blower silencers and inlet filter = 1.0 psi
Head loss through air piping and fittings = 0.5 psi
Pressure = (4.87 + 0.5 + 1.0 + 0.5) psi = 6.87 psi
According to the pressure -performance curves provided by the manufacturer for the
existing blowers, the existing blowers should discharge approximately 1600 cfin at 7.0 psi.
The replacement of the existing motors with newer 75 hp motors on variable frequency
drives capable of turning the motor rpm down from 1750 to 700 rpm or slower would
permit the blowers to discharge at any point on their curve.
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