NC0041530_Renewal (Application)_20240513

ROY COOPER �.
Governor •
ELIZABETH S.BISER • ""°°^'
Secretary
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
May 13, 2024
Ocracoke Sanitary District
Attn: David Tolson, Plant & System Manager
PO Box 567
Ocracoke, NC 27960-0567
Subject: Permit Renewal
Application No. NC0041530
Ocracoke Reverse Osmosis WTP
Hyde County
Dear Applicant:
The Water Quality Permitting Section acknowledges the May 10, 2024, 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. 150B-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://www.deq.nc.gov/permits-rules/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
t7,1(
Wren T df d
Administrative Assistant
Water Quality Permitting Section
cc: Janie M. Garrish, Office Manager
ec: WQPS Laserfiche File w/application
D_E — North Carolina Depanmfent of Environmental Quality Division of Water Resources
Depoliwerrl
'�/'J(/t Washington Regional Office 943 Washington Square Mall Washngton.North Carolina 27889
a I++^ o / 252.946.6481

OCRACOKE SANITARY DISTRICT
rity
P.O. BOX 567 OFFICE 252-928-5791
#159 WATER PLANT ROAD PLANT/FAX [phone]
OCRACOKE, NC 27960
RECEIVED
May 3,2024 MAY 10 2024
Division of Water Resources NCDEQIDWRINPDES
Division of Water Quality Permitting Section
NPDES Unit
1617 Mail Service Center
Raleigh,NC 27699-1617
Re: Permit Number NC0041530, Ocracoke Sanitary District, Hyde County
The Ocracoke Sanitary District is requesting renewal of NPDES Permit No.NC0041530.
Enclosed are an original and two copies of this letter. Also enclosed are an original and two
copies of the completed application a schematic of wastewater flow and location map.
Ocracoke Sanitary District uses Reverse Osmosis(RO)to treat its raw water at 65% product-
drinking water to 35% waste- reject water. The RO process has no sludge, which explains why
Ocracoke Sanitary District has no facility sludge management plan.
If you have any questions, or need more information, please contact this office.
Sincerely, C I �--�' 4
7.1 ��, ts <.
David G.Tolson
Plant& Systems Manager
EFFLUENT PERMIT

OCRACOKE SANITARY DISTRICT
rroy
P.O. BOX 567 OFFICE 252-928-5791
#159 WATER PLANT ROAD PLANT/FAX [phone]
OCRACOKE,NC 27960 1
[e-mail]
The Following Attachments are Included in this Package:
Form 1
1. Section 6—Topographic Map showing Water Plant, Boundary, Outfall 001 and
Pamlico Sound.
Form 2C
1. Summary of Ocracoke Sanitary District Reverse Osmosis Water Plant
2. Flow Chart of Plant with Water Flow. Flow depends on how long water plant
runs. We are a tourist resort area and in the off season months we run 1 —3 hours
per day in the peak season we may run 8 to 14 hours per day so flow can vary
greatly depending on time of the year. We have a year round population of about
900 and in the summer, we can have 12,000 to 18,000 people which include day
trippers, tourists staying here and those who just pass through.
3. I have also included pat 3 of our current permit showing what you have required us
to test.

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 NC 0041530 OCRACOKE SANITARY DIST OMB No.2040-0004
Form U.S. Environmental Protection Agency
�-iEPA Application for NPDES Permit to Discharge Wastewater
NPDES GENERAL INFORMATION
SECTION 1.ACTIVITIES REQUIRING AN NPDES PERMIT(40 CFR 122.21(f)and(f)(1))
1.1 Applicants Not Required to Submit Form 1
Is the facility a new or existing publicly owned Is the facility a new or existing treatment works
1.1.1 12
treatment works? 1. . treating domestic sewage?
If yes,STOP. Do NOT complete ❑ No If yes,STOP.Do NOT 1=1 No
Form 1.Complete Form 2A. complete Form 1.Complete
Form 2S.
1.2 Applicants Required to Submit Form 1
1.2.1 Is the facility a concentrated animal feeding 1.2.2 Is the facility an existing manufacturing,
operation or a concentrated aquatic animal commercial,mining,or silvicultural facility that is
a production facility? currently discharging process wastewater?
Yes 4 Complete Form 1 No El Yes 4 Complete Form E No
and Form 2B. 1 and Form 2C.
c 1.2.3 Is the facility a new manufacturing,commercial, 1.2.4 Is the facility a new or existing manufacturing,
mining,or silvicultural facility that has not yet commercial, mining,or silvicultural facility that
commenced to discharge? discharges only nonprocess wastewater?
d ❑ Yes 4 Complete Form 1 ❑ No ❑ Yes 4 Complete Form 1=1 No
ce and Form 2D. 1 and Form 2E.
•21.2.5 Is the facility a new or existing facility whose
discharge is composed entirely of stormwater
associated with industrial activity or whose
discharge is composed of both stormwater and
non-stormwater?
❑ Yes 4 Complete Form 1 No
and Form 2F
unless exempted by
40 CFR
122.26(b)(14)(x)or
b 15 .
SECTION 2.NAME,MAILING ADDRESS,AND LOCATION(40 CFR 172.21(f)(2))
2.1 Facility Name
OCRACOKE SANITARY DISTRICT
O 2.2 EPA Identification Number
U
O 110018713463
J
2.3 Facility Contact
cn-
Name(first and last) Title Phone number
E
JANIE M.GARRISH OFFICE MANAGER 252-928-5791
Email address
[e-mail]
• 2.4 Facility Mailing Address
ra Street or P.O.box
I z
P.0.BOX 567
City or town State ZIP code
OCRACOKE INC 27960
EPA Form 3510-1 (revised 3-19) Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 NC 0041530 OCRACOKE SANITARY DIST OMB No.2040-0004
y d 2.5 Facility Location
oc Street, route number,or other specific identifier
Q 0 159 WATER PLANT ROAD
rn
_ c County name County code(if known)
E HYDE
ai 0
City or town State ZIP code
z OCRACOKE NC 27960
SECTION 3.SIC AND NAICS CODES(40 CFR 122.21(f)(3))
3.1 SIC Code(s) Description(optional)
4941 PUBLIC WATER SYSTEM
fA
0
C)
Cl)
3.2 NAICS Code(s) Description(optional)
221310 PUBLIC WATER SYSTEM
C)
Cl)
SECTION 4.OPERATOR INFORMATION(40 CFR 122.21(f)(4))
4.1 Name of Operator
EARL H.GASKINS,JR.
0 4.2 Is the name you listed in Item 4.1 also the owner?
4-5
€ ❑ Yes ENo
0
4.3 Operator Status
❑ Public—federal ❑ Public—state ❑ Other public(specify)
o ❑ Private E Other(specify) SANITARY DISTRIC
4.4 Phone Number of Operator
252-928-5791
4.5 Operator Address
Street or P.O. Box
E P.O.BOX 567
g
City or town State ZIP code
O 0 OCRACOKE NC 27960
is
fl Email address of operator
0
SECTION 5.INDIAN LAND(40 CFR 122.21(f)(5))
• c 5.1 Is the facility located on Indian Land?
03
c ❑ Yes El No
EPA Form 3510-1(revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 NC 0041530 OCRACOKE SANITARY DIST OMB No.2040-0004
SECTION 6.EXISTING ENVIRONMENTAL PERMITS(40 CFR 122.21(f)(6))
6.1 Existing Environmental Permits(check all that apply and print or type the corresponding permit number for each)
❑✓ NPDES(discharges to surface ❑ RCRA(hazardous wastes) ❑ UIC(underground injection of
o water) fluids)
.� -- NC0041530
w a ❑ PSD(air emissions) ❑ Nonattainment program(CM) ❑ NESHAPs(CM)
w ❑ Ocean dumping(MPRSA) ❑ Dredge or fill (CWA Section 404) ❑ Other(specify)
SECTION 7.MAP(40 CFR 122.21(f)(7))
7.1 Have you attached a topographic map containing all required information to this application?(See instructions for
specific requirements.)
E]Yes ❑ No ❑ CAFO—Not Applicable(See requirements in Form 2B.)
SECTION 8.NATURE OF BUSINESS(40 CFR 122.21(f)(8))
8.1 Describe the nature of your business.
PUBLICE WATER SYSTEM/REVERSE OSMOSIS PROCESS
N
N
Ca
N
O
N
CO
SECTION 9.COOLING WATER INTAKE STRUCTURES(40 CFR 122.21(f)(9))
9.1 Does your facility use cooling water?
0 Yes ❑r No -) SKIP to Item 10.1.
9.2 Identify the source of cooling water.(Note that facilities that use a cooling water intake structure as described at
a)2 40 CFR 125,Subparts I and J may have additional application requirements at 40 CFR 122.21(r).Consult with your
o Y NPDES permitting authority to determine what specific information needs to be submitted and when.)
o
SECTION 10.VARIANCE REQUESTS(40 CFR 122.21(f)(10))
10.1 Do you intend to request or renew one or more of the variances authorized at 40 CFR 122.21(m)?(Check all that
N apply.Consult with your NPDES permitting authority to determine what information needs to be submitted and
when.)
0 ❑ Fundamentally different factors(CWA ElWater quality related effluent limitations(CWA Section
ce Section 301(n)) 302(b)(2))
CU
❑ Non-conventional pollutants(CWA ❑ Thermal discharges(CWA Section 316(a))
co
I� >
Section 301(c)and(g))
Not applicable
EPA Form 3510-1(revised 3-19) Page 3

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 NC 0041530 OCRACOKE SANITARY DIST OMB No.2040-0004
SECTION 11.CHECKLIST AND CERTIFICATION STATEMENT(40 CFR 122.22(a)and(d))
11.1 In Column 1 below, mark the sections of Form 1 that you have completed and are submitting with your application.
For each section,specifyin Column 2 anyattachments thatyou are enclosingto alert the permittingauthority.Note
Y
that not all applicants are required to provide attachments.
Column 1 Column 2
0 Section 1:Activities Requiring an NPDES Permit ❑ w/attachments
0 Section 2:Name,Mailing Address,and Location ❑ wl attachments
0 Section 3:SIC Codes ❑ w/attachments
0 Section 4:Operator Information ❑ wl attachments
0 Section 5: Indian Land ❑ wl attachments
0 Section 6: Existing Environmental Permits ❑ wl attachments
0 Section 7:Map wl topographic
❑ map ❑ w/additional attachments
0 0 Section 8:Nature of Business ❑ w/attachments
0 Section 9:Cooling Water Intake Structures ❑ wl attachments
a
0 Section 10:Variance Requests ❑ wl attachments
y Cl Section 11:Checklist and Certification Statement 0 wl attachments
11.2 Certification Statement
L
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 fine and imprisonment for knowing violations.
Name(print or type first and last name) Official title
DAVID G.TOLSON PLANT&SYSTEMS MANAGER
Signature Date signed
EPA Form 3510-1(revised 3-19) Page 4

1
. Outfall 001 •
[flows northwest into .
Mary Ann's Pond]
a..
to. \..1 . O. .
Otri
•
Dil . . . 1---, .- p „.. ............._. ..._...._
Pamlico Sound . 'Mary jj
. .�'+t31�8 a �''�.�.,w
r t • • '• :_* Water Plant Rd .1 ,, �'a•�
L•g. ~ 4,-z: x ' IN-,. *' t• tip.
• AT +�n4 ' s •
ff'11'F, 'K;;��;,:�• I ,rt �:. ..w It r
�. . 1{ \..;;- , . Approximate ` Ci
1\ • �=�` r •,-... -• .-� '`.4 Facility Boundary `�
CoastGuard S - , •�` , • •' �'•.- ' ti t
.4 �``+ lK { . h '*" ..
. • °i' ' •
? Lake ,--'-- + s � ••�'
. fi.;,,c. . . , . i .....?"/J 16,-?../ . ar Of N,,••.„ 1
It. IA ..s..k.-....„.7.5.... _.......,..--,,,.....!.:: , :iit•..),<A06,,,,". . //4i,
f ::i!'.0.- At Ar V-7:7\ .ii,::• •• j`4, .: \*>,,,,s,., •4, I'
1 O ceac . 0._ :`kV') LI :' : =�«X:4114.44• 1. yr;n'.! �+} r �, • .,�w *�� 4 •
•
Piles D : d .<4. + �)rtIP • ;'jr
. . ' '. 's--.Fite.:'.. , *. --e • - ...•;:f.:7'.::.;.',:.. .....'.•:.:.• ,"..<
prIr errs .: / • — •- " : `.. ::= . . .
Ocracoke Sanitary District RO WTP l �
NPDES Permit NC0041530A r
159 Water Plant Road,Ocracoke 27960 a ''
Receiving Stream:Mary Ann's Pond(Pamlico Sound)
Stream Segment:29-89 Stream Class:SA;HQW 35.12°N, -75.985°W
River Basin:Tar-Pamlico Sub-Basin#:03-03-08 SCALE NC Grid:G35SW
County:Hyde I MC:030201050207 1:10,000 USGS Quad:Ocracoke,NC

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 NC0041530 OCRACOKE SANITARY DIST OMB No.2040-0004
Form U.S. Environmental Protection Agency
2C . EPA Application for NPDES Permit to Discharge Wastewater
NPDES EXISTING MANUFACTURING,COMMERCIAL,MINING,AND SILVICULTURE OPERATIONS
SECTION 1.OUTFALL LOCATION(40 CFR 122.21(g)(1))
1.1 Provide information on each of the facility's outfalls in the table below.
g Numbelr Receiving Water Name Latitude Longitude
ra
001 PAMLICO SOUND 35° 06' 58" 7° 59' 19"
<C
0
SECTION 2.LINE DRAWING(40 CFR 122.21(g)(2))
p, 2.1 Have you attached a line drawing to this application that shows the water flow through your facility with a water
balance?(See instructions for drawing requirements.See Exhibit 2C-1 at end of instructions for example.)
❑r Yes ❑ No
SECTION 3.AVERAGE FLOWS AND TREATMENT(40 CFR 122.21(g)(3))
3.1 For each outfall identified under Item 1.1,provide average flow and treatment information.Add additional sheets if
necessary.
**Outfall Number** o01
Operations Contributing to Flow
Operation Average Flow
REVERSE OSMOSIS WATER SYSTEM 0.2642 mgd
mgd
I
cts
y mgd
3
Treatment Units
Description Code from Final Disposal of Solid or
co
(include size,flow rate through each treatment unit, Table 2C-1 Liquid Wastes Other Than
a retention time,etc.) by Discharge
9 R/O UNITS APPROX 500 GMP 1-S N/A
EPA Form 3510-2C(Revised 3-19) Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 NC0041530 OCRACOKE SANITARY DIST OMB No.2040-0004
3.1 **Outfall Number** N/A
cont. Operations Contributing to Flow
Operation Average Flow
mgd
mgd
mgd
mgd
Treatment Units
Description Final Disposal of Solid or
(include size,flow rate through each treatment unit, Code from Liquid Wastes Other Than
retention time,etc.) Table 2C-1 by Discharge
d
.=
0
C)
c
m
E
co
m
H
**Outfall Number** N/A
H Operations Contributing to Flow
o Operation Average Flow
mgd
d
' mgd
mgd
mgd
Treatment Units
Description Code from Final Disposal of Solid or
(include size,flow rate through each treatment unit, Table 2C-1 Liquid Wastes Other Than
retention time,etc.) by Discharge
3.2 Are you applying for an NPDES permit to operate a privately owned treatment works?
❑ Yes ElNo 4 SKIP to Section 4.
rn M 3.3 Have you attached a list that identifies each user of the treatment works?
❑ Yes El No
EPA Form 3510-2C(Revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 NC0041530 OCRACOKE SANITARY DIST OMB No.2040-0004
SECTION 4.INTERMITTENT FLOWS(40 CFR 122.21(g)(4))
4.1 Except for storm runoff,leaks,or spills,are any discharges described in Sections 1 and 3 intermittent or seasonal?
❑r Yes ❑ No 4 SKIP to Section 5.
4.2 Provide information on intermittent or seasonal flows for each applicable outfall.Attach additional pages,if necessary.
Outfall Operation Frec,uency Flow Rate
Number (list) Average Average Long-Term Maximum Duration
Days/Week Months/Year Average Daily
R/O WATER PLANT 7 days/week 12 months/year 0.1380 mgd 0.2812 mgd 365 days
0 001 days/week months/year mgd mgd days
LL
I m days/week months/year mgd mgd days
1 days/week months/year mgd mgd days
c
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
SECTION 5.PRODUCTION(40 CFR 122.21(g)(5))
5.1 Do any effluent limitation guidelines(ELGs)promulgated by EPA under Section 304 of the CWA apply to your facility?
❑ Yes 0 No 4 SKIP to Section 6.
u) 5.2 Provide the following information on applicable ELGs.
w ELG Category ELG Subcategory Regulatory Citation
d
-71
CC
0
a
a
5.3 Are any of the applicable ELGs expressed in terms of production(or other measure of operation)?
❑ Yes ID No 4 SKIP to Section 6.
0
c 5.4 Provide an actual measure of daily production expressed in terms and units of applicable ELGs.
J
Outfall Operation,Product,or Material Quantity per DayUnit of
-o NumberMeasure
d
N
co
O
V
-D
0 I
a
EPA Form 3510-2C(Revised 3-19) Page 3

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 NC0041530 OCRACOKE SANITARY DIST OMB No.2040-0004
SECTION 6.IMPROVEMENTS(40 CFR 122.21(g)(6))
6.1 Are you presently required by any federal,state,or local authority to meet an implementation schedule for constructing,
upgrading,or operating wastewater treatment equipment or practices or any other environmental programs that could
affect the discharges described in this application?
❑ Yes ❑ No 4 SKIP to Item 6.3.
6.2 Briefly identify each applicable project in the table below.
Affected Final Compliance Dates
E Brief Identification and Description of Outfalls Source(s)of
Project (list outfall Discharge Required Projected
number)
E
= N/A
N
d
R
C.
G
6.3 Have you attached sheets describing any additional water pollution control programs(or other environmental projects
that may affect your discharges)that you now have underway or planned? (optional item)
❑ Yes ❑ No ❑✓ Not applicable
SECTION 7.EFFLUENT AND INTAKE CHARACTERISTICS(40 CFR 122.21(g)(7))
See the instructions to determine the pollutants and parameters you are required to monitor and, in turn,the tables you must
complete. Not all applicants need to complete each table.
Table A.Conventional and Non-Conventional Pollutants
7.1 Are you requesting a waiver from your NPDES permitting authority for one or more of the Table A pollutants for any of
your outfalls?
❑ Yes ❑r No 4 SKIP to Item 7.3.
7.2 If yes, indicate the applicable outfalls below.Attach waiver request and other required information to the application.
Outfall Number Outfall Number Outfall Number
7.3 Have you completed monitoring for all Table A pollutants at each of your outfalls for which a waiver has not been
y requested and attached the results to this application package?
°f No;a waiver has been requested from my NPDES
ElYes ❑ permitting authority for all pollutants at all outfalls.
Table B.Toxic Metals,Cyanide,Total Phenols,and Organic Toxic Pollutants
x 7.4 Do any of the facility's processes that contribute wastewater fall into one or more of the primary industry categories
listed in Exhibit 2C-3?(See end of instructions for exhibit.)
❑ Yes r❑ No 4 SKIP to Item 7.8.
E 7.5 Have you checked"Testing Required"for all toxic metals,cyanide,and total phenols in Section 1 of Table B?
❑ Yes 0 No
7.6 List the applicable primary industry categories and check the boxes indicating the required GC/MS fraction(s)identified
in Exhibit 2C-3.
Primary Industry Category Required GC/MS Fraction(s)
(Check applicable boxes.)
N/A ❑Volatile 0 Acid 0 Base/Neutral 0 Pesticide
0 Volatile 0 Acid 0 Base/Neutral 0 Pesticide
0 Volatile 0 Acid 0 Base/Neutral 0 Pesticide
EPA Form 3510-2C(Revised 3-19) Page 4

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 NC0041530 OCRACOKE SANITARY DIST OMB No.2040-0004
7.7 Have you checked"Testing Required"for all required pollutants in Sections 2 through 5 of Table B for each of the
GC/MS fractions checked in Item 7.6?
❑ Yes El No
7.8 Have you checked"Believed Present"or"Believed Absent"for all pollutants listed in Sections 1 through 5 of Table B
where testing is not required?
❑ Yes ElNo
7.9 Have you provided(1)quantitative data for those Section 1,Table B,pollutants for which you have indicated testing is
required or(2)quantitative data or other required information for those Section 1,Table B,pollutants that you have
indicated are"Believed Present"in your discharge?
❑ Yes 0 No
7.10 Does the applicant qualify for a small business exemption under the criteria specified in the instructions?
❑ Yes 4 Note that you qualify at the top of Table B, 0 No
then SKIP to Item 7.12.
= 7.11 Have you provided(1)quantitative data for those Sections 2 through 5,Table B, pollutants for which you have
o determined testing is required or(2)quantitative data or an explanation for those Sections 2 through 5,Table B,
pollutants you have indicated are"Believed Present"in your discharge?
❑ Yes El No
d Table C.Certain Conventional and Non-Conventional Pollutants
7.12 Have you indicated whether pollutants are"Believed Present"or"Believed Absent"for all pollutants listed on Table C
for all outfalls?
d ❑ Yes 0 No
c 7.13 Have you completed Table C by providing(1)quantitative data for those pollutants that are limited either directly or
indirectly in an ELG and/or(2)quantitative data or an explanation for those pollutants for which you have indicated
"Believed Present"?
0 Yes 0 No
w Table D.Certain Hazardous Substances and Asbestos
7.14 Have you indicated whether pollutants are"Believed Present"or"Believed Absent"for all pollutants listed in Table D for
all outfalls?
❑ Yes 0 No
7.15 Have you completed Table D by(1)describing the reasons the applicable pollutants are expected to be discharged
and(2)by providing quantitative data,if available?
❑ Yes 0 No
Table E.2,3,7,8-Tetrachlorodibenzo-p-Dioxin(2,3,7,8-TCDD)
7.16 Does the facility use or manufacture one or more of the 2,3,7,8-TCDD congeners listed in the instructions,or do you
know or have reason to believe that TCDD is or may be present in the effluent?
❑ Yes 4 Complete Table E. 0 No 4 SKIP to Section 8.
7.17 Have you completed Table E by reporting qualitative data for TCDD?
❑ Yes ❑ No
SECTION 8.USED OR MANUFACTURED TOXICS(40 CFR 122.21(g)(9))
8.1 Is any pollutant listed in Table B a substance or a component of a substance used or manufactured at your facility as
an intermediate or final product or byproduct?
❑ Yes 0 No 4 SKIP to Section 9.
8.2 List the pollutants below.
c -
al X
1. 4. 7.
0
2. 5. 8.
y
3. 6. 9.
EPA Form 3510-2C(Revised 3-19) Page 5

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 NC0041530 OCRACOKE SANITARY DIST OMB No.2040-0004
SECTION 9.BIOLOGICAL TOXICITY TESTS(40 CFR 122.21(9)(11))
9.1 Do you have any knowledge or reason to believe that any biological test for acute or chronic toxicity has been made
within the last three years on(1)any of your discharges or(2)on a receiving water in relation to your discharge?
❑r Yes ❑ No 4 SKIP to Section 10.
9.2 Identify the tests and their Durposes below.
Test(s) Purpose of Test(s) Submitted to NPDES Date Submitted
o Permitting Authority?
ACUTE TOXICITY REQUIRED BY EXISTING
QUARTERLY PERMIT Yes CI No 03/15/2024
0
0
m ❑ Yes ❑ No
❑ Yes ❑ No
SECTION 10.CONTRACT ANALYSES(40 CFR 122.21(g)(12))
10.1 Were any of the analyses reported in Section 7 performed by a contract laboratory or consulting firm?
❑� Yes ❑ No 4 SKIP to Section 11.
10.2 Provide information for each contract laboratory or consulting firm below.
Laboratory Number 1 Laboratory Number 2 Laboratory Number 3
Name of laboratory/firm MERITECH,INC. WAYPOINT ANALYTICAL
N
�, Laboratory address 642 TAMCO ROAD 114 OAKMONT DRIVE
P.0.BOX 27 GREENVILLE,NC 27835
REIDSVILLE NC 27323
cc
Phone number
3363424748 [phone]
Pollutant(s)analyzed ACUTE TOXICITY TURBIDITY
SALINITY
TDS
AMMONIA NITROGEN
TOTAL KJELDAHL NITRO
TOTAL NITROGEN
SECTION 11.ADDITIONAL INFORMATION(40 CFR 122.21(9)(13))
11.1 Has the NPDES permitting authority requested additional information?
c ❑ Yes ❑ No 4 SKIP to Section 12.
0
E 11.2 List the information requested and attach it to this application.
1. 4.
2. 5.
3. 6.
EPA Form 3510-20(Revised 3-19) Page 6

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110018713463 OCRACOKE SANITARY DIST OMB No.2040-0004
SECTION 12.CHECKLIST AND CERTIFICATION STATEMENT(40 CFR 122.22(a)and(d))
12.1 In Column 1 below,mark the sections of Form 2C that you have completed and are submitting with your application.
For each section,specify in Column 2 any attachments that you are enclosing to alert the permitting authority. Note
that not all applicants are required to complete all sections or provide attachments.
Column 1 Column 2
E Section 1:Outfall Location 0 w/attachments
El Section 2: Line Drawing ✓❑ w/line drawing El w/additional attachments
Section 3:Average Flows and w/list of each user of
Treatment 0 wl attachments ❑ privately owned treatment
works
❑✓ Section 4: Intermittent Flows ❑ wl attachments
❑✓ Section 5: Production ❑ w/attachments
w/optional additional
ESection 6: Improvements ❑ w/attachments ❑ sheets describing any
additional pollution control
plans
❑ w/request for a waiver and ❑ wl explanation for identical
supporting information outfalls
wl small business exemption w/other attachments
❑ request El
❑ Section 7: Effluent and Intake
�' ❑ w/Table A ❑ w/Table B
Characteristics
❑ w/Table C ❑ wl Table D
w/analytical results as an
❑ w/Table E ❑ attachment
In Section 8:Used or Manufactured ❑ w/attachments
Toxics
❑ Section 9: Biological Toxicity ❑ w/attachments
Tests
El Section 10:Contract Analyses ❑ wl attachments
El Section 11:Additional Information ❑ w/attachments
❑ Section 12:Checklist and ❑ w/attachments
Certification Statement
12.2 Certification Statement
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 fine and imprisonment for knowing violations.
Name(print or type first and last name) Official title
DAVID G.TOLSON PLANT&SYSTEMS MANAGER
Signature Date signed
g 9
.
EPA Form 3510-2C(Revised 3-19) Page 7

OCRACOKE SANITARY DISTRICT
lt.
P.O. BOX 567 OFFICE 252-928-5791
#159 WATER PLANT ROAD PLANT/FAX [phone]
OCRACOKE,NC 27960
SUMMARY OF OCRACOKE SANITARY DISTRICT
WATER PLANT
TYPE OF PLANT- REVERSE OSMOSIS
BEGAN OPERATION -JUNE 1977
SOURCE - DEEP WELLS 620' &640' DEEP (CASTLE HAYNE AQUIFER)
YEAR ROUND WELL WATER TEMPERATURE 73 F
NUMBER OF METERS - ORIGINALLY - 349 CURRENTLY- 1321
MAXIMUM DAILY PRODUCTION - 835,200 GALS. / 24 HOURS OR 580 GPM
MONTHLY USAGE - MINIMUM - 2,100,000 MAXIMUM - 8,300,000
AVERAGE DAILY USE - MINIMUM 80,000 GPD MAXIMUM 350,000 GPD
PLANT UPGRADES &ADDITIONS - 7 (1980, 1987, 1993, 1995, 2000, 2003, 2010-11)
AVERAGE COST TO PRODUCE - $13.62 / 1,000 GALLONS
REVERSE OSMOSIS UNITS - 9 WITH 9 40 HP MOTORS
RO'S 1-6 60 GPM
RO'S 7-9 75 GPM (PUT INTO OPERATION JULY 2011)
MEMBRANES- FILMTEC BW30-8040
HIGH PRESSURE PUMPS- 9 EACH WITH 60 HSP MOTOR
PREFILTERS - 2 EACH HAS 21 3 UM FILTERS 30" LONG 2" DIAMETER
WELLS - ONLY 1 WELL USED AT A TIME WELL 2 CONNECTED TO EMERGENCY GENERATOR
WELL #1 - PUMP 40' DEEP 600 GPM 40 HP MOTOR
WELL #2 - PUMP 80' DEEP 1,000 GPM 75 HP MOTOR
WELL #3 - PUMP 80' DEEP 1,000 GPM 75 HP MOTOR
ALL MOTORS HAVE VARIBLE FREQUENCY DRIVES (VFD'S)
ELEVATED TANK CAPACITY- 150,000 GALLONS
GROUND STORAGE CAPACITY- 400,000 GALLONS (2 200,000 GALLON CONCRETE TANKS)
OSDSUMMARY

PRODUCT WATER LEAVES PLANT AND GOES TO FORCED AIR AERATOR ON DETENTION TANK
(DT) 2 OR STATIC AIR AERATOR ON DT 1. THIS EXPELS THE HYDROGEN SULFIDE (H2S) AND
ADDS OXYGEN (02).
HIGH SERVICE PUMPS - 2 MAXIMUM GPM 1,000 GALLONS EACH
CHEMICALS ADDED - CHLORINE AT 1 PPM, ZINC .3 PPM AND AN ANTI-SCALENT.
THE WATER SYSTEM IS RUN AND OPERATED BY THE OCRACOKE SANITARY DISTRICT WHICH
WAS CREATED IN MAY 1972. A SANITARY DISTRICT IS A POLITICAL SUBDIVISION OF THE
STATE OF NORTH CAROLINA UNDER ARTICLE 2, PART 2 OF THE GENERAL STATUES OF NORTH
CAROLINA SECTION 130A-47 TO 130A-87. THERE IS A FIVE MEMBER ELECTED BOARD OF
COMMISSIONERS THAT SET POLICY AND OVERSEE THE OPERATION OF A SANITARY DISTRICT.
CURRENTLY THERE ARE 6 EMPLOYEES 5 WHO OPERATE THE PLANT AND TAKE CARE OF THE
DISTRIBUTION SYSTEM AND 1 OFFICE EMPLOYEE.
OCRACOKE SANITARY DISTRICT IS LOCATED ON OCRACOKE ISLAND, AND IS PART OF THE
OUTER BANKS OF NORTH CAROLINA AND IS IN HYDE COUNTY.
AT PRESENT OCRACOKE IS NOT AN INCORPORATED TOWN. OCRACOKE VILLAGE IS LOCATED
ON THE SOUNDSIDE OF THE WIDEST AND SOUTHERNMOST PART OF THE ISLAND. EXCEPT FOR
THE VILLAGE, THE REST OF THE ISLAND IS PART OF THE CAPE HATTERAS NATIONAL SEASHORE
RECREATION AREA. OCRACOKE IS DEPENDENT ON FERRY SERVICE FOR ACCESSIBILITY.
OCRACOKE IS A RESORT AREA WITH A YEAR ROUND POPULATION OF APPROXIMATELY 900
PERSONS AND A SEASONAL POPULATION OF 12,000 TO 18,000 PERSONS.
OSDSUMMARY

OCRACOKE SANITARY DISTRICT FLOW CHART
Plant running 5.12 hour €1-11=r)
DRILL DEPTH 620 '
PUMP DEPTH 40 '
' 7
,r5��u . att. u t. a `R l +,t� , : s YEAR R UND TEAMF
7.5
,cy ' m ' .2940 gal TDS 3600
OSD only uses ONE WELL
PF 3 um ataTIME
4 gals Vitec
9 HIGH PRES SURE PUMPS 40 HP
F.- RAW MOTORS OUTLET PRESSURE OF
HPP 388 PSIG
MOTOR
blend
13.16 g as-gym 9 RO UNITS 21 MEMBRANES EACH 65 ofo
P I PRODUCT; 35%REJECT ,__ram
r
.166 uT R.I. .1201 gals
gals. t J REJECT WATER(WASTE)IS
" .� ,. _- ___ --__ E 7 PUT IN THE PA1�ILICO SOUND
E C
DT 2 DT 1 T
1
A ' 200,000 GALS 200,000 GALS
T , DETENTION I I DETENTION . �
1 '
TANii TANK ,
rr
Ls
�_ ___ System Pressure 150,000 GALS
p SSsii,_ T�NIs:
' ti o 130 ft.tall
w
128 ft full
10 gals 2 gals 100 $en�ty
I.
462 gals _ _,
VFD at 52.3 Hsi0.,„ 4 I44'I'ER k E-
ll

DocuSign Envelope ID:BF0D7364-5956-47AB-B231-644773E93448
NPDES Permit NC0041530
PART I
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Physical Chemical Not Classified Water Pollution Control System [15A NCAC 08G .0302]
During the period beginning on the effective date of this permit and listing until expiration, the
Permittee is authorized to discharge RO reject water from outfall 001. Such discharges shall be limited,
monitored and reportedl by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS'
CHARACTERISTIC Monthly Daily Measurement Sample Sample
[PARAMETER CODES] Average Maximum Frequency Type Location
Flow(MGD) 50050 Monitor&Report Continuous Recording Effluent
pH(su) 00400 Not<6.8 or>8.5 2/Month Grab Effluent
standard units
Turbidity(NTU) 00070 Monitor&Report Monthly Grab Effluent
li Dissolved Oxygen(mg/L)(DO) 00300 Monitor&Report Monthly Grab Effluent
Salinity(ppth) 00480 Monitor&Report Quarterly Grab Effluent
Conductivity(Ettnhos/cm) 00094 Monitor&Report Quarterly Grab Effluent
Total Dissolved Solids 70295 Monitor&Report Quarterly Grab Effluent
(TDS)(mg/L)
Ammonia Nitrogen(mg/L) C0610 Monitor&Report Quarterly Grab Effluent
TKN 2 (mg/L) 00625 Monitor&Report Quarterly Grab Effluent
NO3-N+NO2-N 2 (mg L) 00630 Monitor&Report Quarterly Grab Effluent
TN 2 (mg/L) C0600 Monitor&Report Quarterly Grab Effluent
Total Phosphorus(mg/L) C0665 Monitor&Report Quarterly Grab Effluent
Total Copper(µg/L)3 01042 Monitor&Report Quarterly Grab Effluent
Total Zinc()Ag/L)3'4 01092 Monitor&Report Quarterly Grab Effluent
Acute WET Testing 5 TGE3E See Footnote 5 . Quarterly Grab Effluent
Footnotes:
1. The Permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Condition A. (3.).
2. For a given wastewater sample, TN=TKN +NO3-N+NO2-N,where TN is Total Nitrogen, TKN is Total
Kjeldahl Nitrogen, and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen, respectively.
3. All practical quantitation limits(PQL) must be sufficiently sensitive considering the respective water quality
standard for each parameter[see Part II. Section D. (4.)]. (For Total Copper a PQL of 2 µg/1 or better is
recommended.)
4. Zinc: This requirement applies only to wastewater discharges that use water treated with zinc orthophosphate.
5. Acute Whole Effluent Toxicity (WET) testing-testing of Mysidopsis bahia (Mysid shrimp) shall be
performed as 24-day pass/fail test,monitoring only, at 90% effluent concentration, during February,May,
August and November [See A. (2.)].
Conditions:
• Samples shall be taken at the outfall but prior to mixing with the receiving waters.
• There shall be no discharge of floating solids or foam visible in other than trace amounts.
Page 3 of 8