NC0025879_Renewal Application_20171017

Water Resources
ENVIRONMENTAL OUALIrY
October 17, 2017
Steve Hooper
Town of Robbinsville
4 Court St
Robbinsville, NC 28771-0129
Subject: Permit Renewal
Application No. NCO025879
Robbinsville WWTP
Graham County
Dear Applicant:
ROY COOPER
Governer
MICHAEL S. REGAN
srcmfory
S. JAY ZIMMERMAN
Dirrrror
The Water Quality Permitting Section acknowledges the October 16, 2017 receipt of your permit renewal application
and supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW
permitting branch. Per G.S. 1506-3 your current permit does not expire until permit decision on the application is made.
Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit.
The permit writer will contact you if additional information is required to complete your permit renewal. Please respond
in a timely manner to requests for additional information necessary to allow a complete review of the application and
renewal of the permit.
Information regarding the status of your renewal application can be found online using the Department of Environmental
Quality's Environmental Application Tracker at:
https://deq.nc.govlpermits-regulations/permit-guidance/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
Sincerely,
JJ ford
�
Wren Thed
Administrative Assistant
Water Quality Permitting Section
cc: Central Files w/application(ARO)
ec: WQPS Laserfiche File w/application
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-807-6300

McGill
A S S O C I A T E S
October 13, 2017
Charles Weaver, Asheville Region NPDES Unit Supervisor
North Carolina Department of Environmental Quality
Division of Water Resources
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Dear Mr. Weaver:
RECEIVEMCDEWWR
RE: Town of Robbinsville
Permit Renewal Application
NPDES Permit No. NCO025879
Graham County, North Carolina
OCT 16 2017
Water Quality
Permitting Section
On behalf of the Town of Robbinsville, please find enclosed the NPDES Form 2A
application, site map, and process flow schematic for the above referenced discharge permit.
Please feel free to contact us if you have any questions or need any additional information.
Sincerely,
McGILL ASSOCIATES, P.A.
KYLE SEAMAN, PE
Project Engineer
[e-mail]
Enclosure
cc: Steve Hooper — Mayor, Town of Robbinsville
Ben Cathey, PE, McGill Associates
I \PrQlects\2017\17 00359\Misc\NC0025879 NPDES Renewal\cwl3oct2017 docx
55 Broad Strcet P O Box 2259 ph 828 252 0575
Asheville, North Carolina 28801 Asheville, North Carolina 28802 f 828 2522518 www mcgillengmeers corn

FACILITY NAME AND PERMIT NUMBER.
PERMIT ACTION REQUESTED
RIVER BASIN•
Robbinsvllle WWTP, NCO025879
Renewal
Little Tennessee
FORM
2A NPDES FORM 2A APPLICATI • N OVERVIEW
NPDES
APPLICATION OVERVIEW
Form 2A has been developed in a modular format and consists of a "Basic Application Information" packet
and a "Supplemental Application Information" packet. The Basic Application Information packet is divided
into two parts. All applicants must complete Parts A and C. Applicants with a design flow greater than or
equal to 0.1 mgd must also complete Part B. Some applicants must also complete the Supplemental
Application Information packet. The following items explain which parts of Form 2A you must complete.
BASIC APPLICATION INFORMATION:
A. Basic Application Information for all Applicants. All applicants must complete questions A 1 through A 8 A treatment works
that discharges effluent to surface waters of the United States must also answer questions A 9 through A 12
B. Additional Application Information for Applicants with a Design Flow ;-> 0 1 mgd. All treatment works that have design flows
greater than or equal to 01 million gallons per day must complete questions B 1 through B 6
C. Certification. All applicants must complete Part C (Certification)
SUPPLEMENTAL APPLICATION INFORMATION.
D. Expanded Effluent Testing Data. A treatment works that discharges effluent to surface waters of the United States and meets
one or more of the following criteria must complete Part D (Expanded Effluent Testing Data)
1 Has a design flow rate greater than or equal to 1 mgd,
2 Is required to have a pretreatment program (or has one in place), or
3 Is otherwise required by the permitting authority to provide the information
E. Toxicity Testing Data. A treatment works that meets one or more of the following criteria must complete Part E (Toxicity Testing
Data)
1 Has a design flow rate greater than or equal to 1 mgd,
2 Is required to have a pretreatment program (or has one in place), or
3 Is otherwise required by the permitting authority to submit results of toxicity testing
F. Industrial User Discharges and RCRA/CERCLA Wastes. A treatment works that accepts process wastewater from any
significant industrial users (SIUs) or receives RCRA or CERCLA wastes must complete Part F (Industrial User Discharges
and RCRA/CERCLA Wastes) SIUs are defined as
1 All industrial users subject to Categorical Pretreatment Standards under 40 Code of Federal Regulations (CFR) 403 6 and
40 CFR Chapter I, Subchapter N (see instructions), and
2 Any other industrial user that
a Discharges an average of 25,000 gallons per day or more of process wastewater to the treatment works (with certain
exclusions), or
b Contributes a process wastestream that makes up 5 percent or more of the average dry weather hydraulic or organic
capacity of the treatment plant, or
c Is designated as an SIU by the control authority
G. Combined Sewer Systems. A treatment works that has a combined sewer system must complete Part G (Combined Sewer
Systems)
ALL APPLICANTS MUST COMPLETE PART t (CERTIFICATION)
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 1 of 9

FACILITY NAME AND PERMIT NUMBER
PERMIT ACTION REQUESTED
RIVER BASIN
Robbinsvllle WWTP, NCO025879
Renewal
Little Tennessee
BASIC APPLICATION INFORMATION
PART A. BASIC APPLICATION INFORMATION FOR ALL APPLICANTS:
All treatment works must complete questions A.1 through A 8 of this Basic Application Information Packet
A.1 Facility Information
Facility Name Robbinsville WWTP
Mailing Address Post Office Box 126
Robbinsville North Carolina 28771
Contact Person Steve Hooper
Title Mayor
Telephone Number [phone]
Facility Address 197 Sandhole Road
(not P O Box) Robbinsville North Carolina 28771
A 2 Applicant Information If the applicant is different from the above, provide the following
Applicant Name
Mailing Address
Contact Person
Title
Telephone Number ( )
Is the applicant the owner or operator (or both) of the treatment works?
® owner ❑ operator
Indicate whether correspondence regarding this permit should be directed to the facility or the applicant
® facility ❑ applicant
A3 Existing Environmental Permits. Provide the permit number of any existing environmental permits that have been issued to the treatment works
(include state -issued permits)
NPDES NCO025879 PSD
UIC Other
RCRA Other
A 4 Collection System Information. Provide information on municipalities and areas served by the facility Provide the name and population of each
entity and, if known, provide information on the type of collection system (combined vs separate) and its ownership (municipal, private, etc )
Name Population Served Type of Collection System Ownership
Town of Robbinswlle 2,000 Separate Municipal
Total population served 2.000
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 2 of 9

FACILITY NAME AND PERMIT NUMBER PERMIT ACTION REQUESTED: RIVER BASIN
Robbinsvllle WWTP, NCO025879 Renewal Little Tennessee
A.5 Indian Country.
a Is the treatment works located in Indian Country?
❑ Yes N No
b Does the treatment works discharge to a receiving water that is either in Indian Country or that is upstream from (and eventually flows
through) Indian Country?
❑ Yes N No
A6 Flow Indicate the design flow rate of the treatment plant (i e , the wastewater flow rate that the plant was built to handle) Also provide the
average daily flow rate and maximum daily flow rate for each of the last three years Each year's data must be based on a 12 -month time period
with the 12th month of "this year" occurring no more than three months prior to this application submittal
a Design flow rate 0 63 mgd
Two Years Apo Last Year This Year
b Annual average daily flow rate 0 230 0 245 0 193
c Maximum daily flow rate 1.121 1 513 1 265
A 7 Collection System Indicate the type(s) of collection system(s) used by the treatment plant Check all that apply Also estimate the percent
contribution (by miles) of each
N Separate sanitary sewer 100 %
❑ Combined storm and sanitary sewer %
A 8 Discharges and Other Disposal Methods
a Does the treatment works discharge effluent to waters of the U S ? N Yes ❑ No
If yes, list how many of each of the following types of discharge points the treatment works uses
I Discharges of treated effluent
n Discharges of untreated or partially treated effluent
ui Combined sewer overflow points
IV Constructed emergency overflows (prior to the headworks)
V Other
b Does the treatment works discharge effluent to basins, ponds, or other surface impoundments
that do not have outlets for discharge to waters of the U S ? ❑ Yes
If yes, provide the following for each surface impoundment
Location
Annual average daily volume discharge to surface impoundment(s)
Is discharge ❑ continuous or ❑ intermittent?
C Does the treatment works land -apply treated wastewater?
If yes, provide the following for each land application site
d
Location
Number of acres
Annual average daily volume applied to site
Is land application ❑ continuous or ❑ intermittent?
Does the treatment works discharge or transport treated or untreated wastewater to another
treatment works?
N No
❑ Yes
mgd
mgd
N No
❑ Yes N No
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 3 of 9

FACILITY NAME AND PERMIT NUMBER
PERMIT ACTION REQUESTED
RIVER BASIN'
Robbinsville WWTP, NCO025879
Renewal
Little Tennessee
If yes, describe the mean(s) by which the wastewater from the treatment works is discharged or transported to the other treatment works
(e g , tank truck, pipe)
If transport is by a party other than the applicant, provide
Transporter Name
Mailing Address
Contact Person
Title
Telephone Number ( 1
For each treatment works that receives this discharge, provide the following
Name
Mailing Address
Contact Person
Title
Telephone Number ( 1
If known, provide the NPDES permit number of the treatment works that receives this discharge
Provide the average daily flow rate from the treatment works into the receiving facility
mgd
e Does the treatment works discharge or dispose of its wastewater in a manner not included
in A 8 through A 8 d above (e g , underground percolation, well infection) ❑ Yes
® No
If yes, provide the following for each disposal method
Description of method (including location and size of site(s) if applicable)
Annual daily volume disposed by this method
Is disposal through this method ❑ continuous or ❑ intermittent?
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 4 of 9

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED RIVER BASIN'
Robbinsvllle WWTP, NCO025879 Renewal Little Tennessee
WASTEWATER DISCHARGES:
If you answered "Yes" to question A.8.a, complete questions A 9 through A 12 once for each outfall (including bypass points) through
which effluent is discharged. Do not include information on combined sewer overflows in this section If you answered "No" to question
A 8 a, go to Part B, "Additional Application Information for Applicants with a Design Flow Greater than or Equal to 0.1 mgd."
A.9. Description of Outfall
a Outfall number
b Location Town of Robbinsville
28771
(City or town, if applicable)
(Zip Code)
Graham
North Carolina
(County)
(State)
35° 19'55" N
83° 48' 34" W
(Latitude)
(Longitude)
c Distance from shore (if applicable) N/A
ft
d Depth below surface (If applicable) N/A
ft
e Average daily flow rate 0 222
mgd
f Does this outfall have either an intermittent or a periodic discharge? ❑ Yes
® No (go to A 9 g )
If yes, provide the following information
Number f times per year discharge occurs
Average duration of each discharge
Average flow per discharge mgd
Months in which discharge occurs
g Is outfall equipped with a diffuser? ❑ Yes ® No
A.10. Description of Receiving Waters.
a Name of receiving water Cheoah River
b Name of watershed (If known) Lower Little Tennessee
United States Soil Conservation Service 14 -digit watershed code (if known)
c Name of State Management/River Basin (if known) Little Tennessee
United States Geological Survey 8 -digit hydrologic cataloging unit code (if known) USGS 06010204
d Critical low flow of receiving stream (if applicable)
acute N/A cfs chronic N/A cfs
e Total hardness of receiving stream at critical low flow (if applicable) N/A mg/I of CaCO3
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 5 of 9

FACILITY NAME AND PERMIT NUMBER-
PERMIT ACTION REQUESTED
RIVER BASIN
Robbinsvllle WWTP, NCO025879
Renewal
Little Tennessee
A.11. Description of Treatment
a What level of treatment are provided? Check all that apply
® Primary ® Secondary
® Advanced ❑ Other Describe
b Indicate the following removal rates (as applicable)
Design BOD5 removal or Design CBOD5 removal 85 %
Design SS removal 85 %
Design P removal N/A %
Design N removal N/A %
Other %
c What type of disinfection is used for the effluent from this outfall? If disinfection varies by season, please describe
Ultra Violet
If disinfection is by chlorination is dechlorination used for this outfall? ❑ Yes ® No
Does the treatment plant have post aeration? ❑ Yes ® No
A.12. Effluent Testing Information. All Applicants that discharge to waters of the US must provide effluent testing data for the following
parameters. Provide the indicated effluent testing required by the permitting authority for each outfall through which effluent is
discharged. Do not include information on combined sewer overflows in this section All information reported must be based on data
collected through analysis conducted using 40 CFR Part 136 methods. In addition, this data must comply with QA/QC requirements of
40 CFR Part 136 and other appropriate QA/QC requirements for standard methods for analytes not addressed by 40 CFR Part 136. At a
minimum, effluent testing data must be based on at least three samples and must be no more than four and one-half years apart.
Outfall number 001
MAXIMUM DAILY VALUE
AVERAGE DAILY VALUE
PARAMETER
Value
Units
Value
Units
Number of Samples
pH (Minimum)
6.2
s u
pH (Maximum)
76
s u-==
=K= -
Flow Rate
1.513
MGD
0.222
MGD
Dail
Temperature (Winter)
17.1
°C
12.9
°C
Weekly
Temperature (Summer)
28.4
°C
23.9
°C
Weekly
' For pH please report a minimum and a maximum daily value
MAXIMUM DAILY
AVERAGE DAILY DISCHARGE
POLLUTANT
DISCHARGE
ANALYTICAL
MLIMDL
Number of
METHOD
Conc
Units
Conc.
Units
Samples
CONVENTIONAL AND NON CONVENTIONAL COMPOUNDS
BIOCHEMICAL OXYGEN
BOD5
11.6
mg/1
2.1
M911
3 X Week
SM5210
2
DEMAND (Report one)
CBOD5
FECAL COLIFORM
740
#100m1
1.2
#100m1
3 X Week
SM 9222D
1
TOTAL SUSPENDED SOLIDS (TSS)
25.5
M9/1
3.1
1 mg/1
1 3 X Week
SM 2540D
2.5
,END OF PART A.
REFER TO THE APPLICATION OVERVIEW (PAGE 11) TO, DETERMINE WHICH OTHER PARTS
OF FORM 2A YOU MUST' COMPLETE
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 $ 7550-22 Page 6 of 9

FACILITY NAME AND PERMIT NUMBER
PERMIT ACTION REQUESTED
RIVER BASIN
Robbinsvllle WWTP, NCO025879
Renewal
Little Tennessee
BASIC APPLICATION INFORMATION
PART B. ADDITIONAL APPLICATION INFORMATION FOR APPLICANTS WITH A DESIGN FLOW GREATER THAN OR
EQUAL TO 0.1 MGD (100,000 gallons per day).
All applicants with a design flow rate Z 0.1 mgd must answer questions B 1 through B 6 All others go to Part C (Certification)
B 1 Inflow and Infiltration. Estimate the average number of gallons per day that flow into the treatment works from inflow and/or infiltration
14,000 gpd
Briefly explain any steps underway or planned to minimize inflow and infiltration
The Town of Robbinsvllle has completed numerous sewer rehabilitation projects and has maintenance programs aimed at
reducing Infiltration and Inflow (1/1) In addition, the Town has an ongoing program to smoke test the sewer collection
system and repair sources of 1/1 as they are discovered
B 2 Topographic Map Attach to this application a topographic map of the area extending at least one mile beyond facility property boundaries This
map must show the outline of the facility and the following information (You may submit more than one map if one map does not show the entire
area )
a The area surrounding the treatment plant, including all unit processes
b The major pipes or other structures through which wastewater enters the treatment works and the pipes or other structures through which
treated wastewater is discharged from the treatment plant Include outfalls from bypass piping, if applicable
c Each well where wastewater from the treatment plant is injected underground
d Wells, springs, other surface water bodies, and drinking water wells that are 1) within''% mile of the property boundaries of the treatment
works, and 2) listed in public record or otherwise known to the applicant
e Any areas where the sewage sludge produced by the treatment works is stored, treated, or disposed
f If the treatment works receives waste that is classified as hazardous under the Resource Conservation and Recovery Act (RCRA) by truck, rail,
or special pipe, show on the map where the hazardous waste enters the treatment works and where it is treated, stored, and/or disposed
B 3 Process Flow Diagram or Schematic Provide a diagram showing the processes of the treatment plant, including all bypass piping and all
backup power sources or redunancy in the system Also provide a water balance showing all treatment units, including disinfection (e g ,
chlorination and dechlonnation) The water balance must show daily average flow rates at influent and discharge points and approximate daily flow
rates between treatment units Include a brief narrative description of the diagram
B 4 Operation/Maintenance Performed by Contractor(s)
Are any operational or maintenance aspects (related to wastewater treatment and effluent quality) of the treatment works the responsibility of a
contractor? ❑ Yes ® No
If yes, list the name, address, telephone number, and status of each contractor and describe the contractor's responsibilities (attach additional
pages if necessary)
Name
Mailing Address
Telephone Number ( 1
Responsibilities of Contractor
B 5 Scheduled improvements and Schedules of Implementation. Provide information on any uncompleted implementation schedule or
uncompleted plans for improvements that will affect the wastewater treatment, effluent quality, or design capacity of the treatment works If the
treatment works has several different implementation schedules or is planning several improvements, submit separate responses to question B 5
for each (If none, go to question B 6 )
a List the outfall number (assigned in question A 9) for each outfall that is covered by this implementation schedule
b Indicate whether the planned improvements or implementation schedule are required by local, State, or Federal agencies
❑ Yes ❑ No
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 7 of 9

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Robbinsville WWTP, NCO025879
Renewal
Little Tennessee
c If the answer to B 5 b is "Yes," briefly describe, including new maximum daily inflow rate (if applicable)
d Provide dates imposed by any compliance schedule or any actual dates of completion for the implementation steps listed below, as
applicable For improvements planned independently of local, State, or Federal agencies, indicate planned or actual completion dates, as
applicable Indicate dates as accurately as possible
Schedule Actual Completion
Implementation Stage MM/DD/YYYY MM/DD/YYYY
- Begin Construction
- End Construction
- Begin Discharge
-Attain Operational Level
e Have appropriate permits/clearances concerning other Federal/State requirements been obtained? ❑ Yes ❑ No
Describe briefly
B 6 EFFLUENT TESTING DATA (GREATER THAN 0.1 MGD ONLY).
Applicants that discharge to waters of the US must provide effluent testing data for the following parameters Provide the indicated
effluent testing required by the permitting authority for each outfall through which effluent is discharged. Do not include information
on combine sewer overflows in this section. All information reported must be based on data collected through analysis conducted
using 40 CFR Part 136 methods. In addition, this data must comply with QA1QC requirements of 40 CFR Part 136 and other appropriate
QA1QC requirements for standard methods for analytes not addressed by 40 CFR Part 136. At a minimum effluent testing data must be
based on at least three pollutant scans and must be no more than four and on -half years old.
Outfall Number 001
MAXIMUM DAILY
AVERAGE DAILY DISCHARGE
POLLUTANT
DISCHARGE
ANALYTICAL
ML/MDLConc.
Number of
METHOD
Units
Conc.
Units
Samples
CONVENTIONAL AND NON CONVENTIONAL COMPOUNDS
AMMONIA (as N)
0.6
mg/I
01
mgll
Weekly
SM4500NH3-F
0.1
CHLORINE (TOTAL
RESIDUAL, TRC)
DISSOLVED OXYGEN
TOTAL KJELDAHL
NITROGEN (TKN)
NITRATE PLUS NITRITE
NITROGEN
OIL and GREASE
PHOSPHORUS (Total)
6.17
mgll
225
mg/I
Monthly
EPA 365.1
0.050
TOTAL DISSOLVED SOLIDS
(TDS)
OTHER Nitrogen (Total)
27.26
mgll
530
mg/I
Monthly
EPA 351.2 & EPA
353.2
012
0 '_F PART.
REFER TO TIME APPLICATION OV _ _ ( ASE 1) TO PETERMINE, WHICH OTHER PARTS
r r - RM 2AYOU MUST COMPLETE
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 8 of 9

FACILITY NAME AND PERMIT NUMBER
PERMIT ACTION REQUESTED
RIVER BASIN
Robbinsvllle WWTP, NCO025879
Renewal
Little Tennessee
BASIC APPLICATION INFORMATION
PART C. CERTIFICATION
All applicants must complete the Certification Section. Refer to instructions to determine who is an officer for the purposes of this
certification All applicants must complete all applicable sections of Form 2A, as explained in the Application Overview Indicate below which
parts of Form 2A you have completed and are submitting By signing this certification statement, applicants confirm that they have reviewed
Form 2A and have completed all sections that apply to the facility for which this application is submitted
Indicate which parts of Form 2A you have completed and are submitting
® Basic Application Information packet Supplemental Application Information packet
❑ Part D (Expanded Effluent Testing Data)
❑ Part E (Toxicity Testing Biomonitoring Data)
❑ Part F (Industrial User Discharges and RCRA/CERCLA Wastes)
❑ Part G (Combined Sewer Systems)
ALL APPLICANTS MUST COMPLETE THE FOLLOWING CERTIFICATION.
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 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 fine and imprisonment
for knowing violations
Name and official title Steve Hooper - Mayor
i
Signature
Telephone number [phone]
Date signed l 0 ` ( �-- -
Upon request of the permitting authority, you must submit any other information necessary to assure wastewater treatment practices at the treatment
works or identify appropriate permitting requirements
SEND COMPLETED FORMS TO:
NCDENR/ DWQ
Attn: NPDES Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 9 of 9

1000 0 500 1000 2000
GRAPHIC SCALE 1 INCH = 1000 FEET
1/1 / - A I - / / A I
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