NC0041530_Renewal (Application)_20190411

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LINDA CULPEPPER NORTH CAROLINA
Director Environmental Quality
April 23, 2019
David G.Tolson, Plant&System Manager
Ocracoke Sanitary District
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 April 23, 2019 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://deq.nc.gov/permits-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,
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Wren Thed ord
Administrative Assistant
Water Quality Permitting Section
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North Cerobna Department of Environmental€Ire lity� I DivSon of 1Vater Resoartr_s
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OCRACOKE SANITARY DISTRICT
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P. O. BOX 567 OFFICE 252-928-5791
#159 WATER PLANT ROAD PLANT/FAX [phone]
OC:RACOKE, NC 27960
April 11, 2019 --
REo:s',fECVDENR/DWR
NC DENR APR 23 2019
Division of Water Quality
NPDES Unit Water Resource;
1617 Mail Service Center
Permit ing Section
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.
David G.Tolson
Plant& Systems Manager
EFFLUENT

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NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number NC0041530
If you are completing this form in computer use the TAB key or the up - down arrows to move from one
field to the next. To check the boxes, click your mouse on top of the box. Otherwise, please print or type.
1. Contact Information:
Owner Name OCRACOKE SANITARY DISTIRCT
Facility Name OCRACOKE SANITARY DISTRICT
Mailing Address P. O. BOX 567, 159 WATER PLANT ROAD
City OCRACOKE
State / Zip Code NORTH CAROLINA, 27960
Telephone Number 252-928-5791
Fax Number 252-928-6651
e-mail Address Ocracokeh2o(i vahoo.com
2. Location of facility producing discharge:
Check here if same as above X
Street Address or State Road
City
State / Zip Code
County
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name OCRACOKE SANITARY DISTRICT BOARD OF COMMISSIONERS
Mailing Address P. O. BOX 567
City OCRACOKE
State / Zip Code NORTH CAROLINA, 27960
Telephone Number 252-928-5791
Fax Number 252-928-6651
Page I of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
4. Ownership Status:
Federal ❑ State ❑ Private ❑ Public ❑
A SANITARY DISTRICT IS A POLICATL SUBDIVISION OF THE STATE &A LEGAL ENTITY &A
SPECIAL DISTRICT. IT IS A GOVERNMENTAL UNIT OPERATED BY AN ELECTED BOARD OF
COMMISSIONERS.
5. Type of treatment plant:
❑ Conventional (Includes coagulation, flocculation, and sedimentation, usually followed by
filtration and disinfection)
❑ Ion Exchange (Sodium Cycle Cationic ion exchange)
❑ Green Sand Filter (No sodium recharge)
X Membrane Technology (RO, nanofiltration)
Check here if the treatment process also uses a water softener ❑
6. Description of source water(s) (i.e. groundwater, surface water)
GROUND WATER - DEEP WELLS
7. Describe the treatment process(es) for the raw water:
WATER IS DRAWN FROM WELLS AND GOES THROUGH 3 UM PREFILTERS, THEN HIGH
PRESSURE PUMPS PUSH WATER THRU REVERSE OSMOSIS MEMBRANES WHEICH ARE 3
STAGE. POTABLE WATER GOES TO AERATOR, DENTENTION TANK AND THEN IS
CHLORINATED AND HIGH PRESSURE PUMPS SEND IT TO ELEVATED TANK AND THE
DISTRIBUTION SYSTEM.
8. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
REJECT WATER GOES IN A DRAIN PIPE AND IS PUMPED TO THE PAMLICO SOUND. THERE
IS NO TREATMENT. OUT OF EVERY 100 GALLONS FROM WELL ARRPDX. 65% BECOMES
POTABLE AND 35% GOES TO PAMLICO SOUND.
9. Number of separate discharge points: ]
Outfall Identification number(s) UUl
10. Frequency of discharge: Continuous ❑ Intermittent X
If intermittent:
Days per week discharge occurs: 7 Duration: 3 TO 18 HOURS PER DAY
11. Plant design potable flowrate .900 MGD
Backwash or reject flow 0.45 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude): PAMLICO SOUND IN TAR-PAMLICO RIVER BASIN
Page 2 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Alum / aluminum sulfate Yes No X
Iron sulfate / ferrous sulfate Yes No X
Fluoride Yes No X
Ammonia nitrogen / Chloramines Yes No X
Zinc-orthophosphate or sweetwater CP1236 Yes X No
List any other additives below:
VITEC 1400 ANTISCALANT
14. Is this facility located on Indian country? (check one)
Yes ❑ No X
15. Additional Information:
Provide a schematic of flow through the facility, include flow volumes at all points in
the water treatment process. The plan should show the point[s] of addition for
chemicals and all discharges routed to an outfall [including stormwater].
✓ Solids Handling Plan REVERSE OSMOSIS PROCESS HAS NOT SLUDGE OR SOLIDS
16. NEW Applicants
Information needed in addition to items 1-15:
y New applicants are highly encouraged to contact a permit coordinator with the
NCDENR Customer Service Center.
Was the Customer Service Center contacted? ❑ Yes ❑ No
Analyses of source water collected
• Engineering Alternative Analysis
• Discharges from Ion Exchange and Reverse Osmosis plants shall be evaluated using a
water quality model.
17. Applicant Certification
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
DAVID G. TOLSON PLANT & SYSTEMS MANAGER
Printed ``name of Person Signing Title
Signature of Applicant Date
Page 3 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
North Carolina General Statute 143-215.6(b)(2)provides that Any person who knowingly makes any false statement representation,or certification in any application,
record,report,plan,or other document files or required to be maintained under Article 21 or regulations of the Environmental Management Commission implementing that
Article,or who falsifies,tampers with,or knowingly renders inaccurate any recording or monitoring device or method required to be operated or maintained under Article 21
or regulations of the Environmental Management Commission implementing that Article,shall be guilty of a misdemeanor punishable by a fine not to exceed$25,000,or by
imprisonment not to exceed six months,or by both. (18 U.S.C.Section 1001 provides a punishment by a fine of not more than$25,000 or imprisonment not more than 5
years,or both,for a similar offense.)
Page 4 of 4 Version 5/2012

' 4. Permit #NC0041530 Ocracoke Sanitary District Hyde County, NC
LOCATION MAP
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C HATTERAS FI.
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NAT SEASHORE / .*::..1_.1. ! -�`::.-�. t� l 1
point ,, •_ �• sacoke( t\ HorPoint
Discharge p_ t • .,. 1 / .:/ • F-, Ux 1r_ T I-
CoastGuard St' 1� ice. ,.,^ ' % _ /�.. __- \`J 1lI • �-
Windmill ,P.'.�r ''cUcraCOke \ .��� P)NE
,Point -I �� Silver\' �* �\ y _ Y��E'/ S
il ^ ") Lake _ ' ••.i - ,
Ocraco a�F+'(L)•_ ! \- �o // ti
Boiler ...... • + k'-
Piles o <. Vti��:. — /,
Cockle Shoal Ltm B • .... `�•• ,`�. P1 �-0 \Q
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Pile _ — / /.:.- .. low, iP —�--,
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�� //= Ocracoke is>aud
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Teaches Hole, I-First Grass . . •
Channel Lt.b
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ROAD CLASSIFICATION
PRIMARY HIGHWAY LIGHT-CUTY ROAD,HARD OR SCALE 1 :24 000
HARD SURFACE IMPROVED SURFACE 0 1 MILE
xc..,...,...,,=—z`er.,:;�m„i!tc:;�:zh:..—y„ a z \\�
SECONDARY HIGHWAY
HARD SURFACE UNIMPROVED ROAD •— — — 0
0 7000 FEET
Latitude 35°06'58" Longitude 75°59'19" R „ 1 is:x. �3� 1 KILOMETER
Map # G35SW Sub-basin 30155 CONTOUR INTERVAL 5 FEET '
Stream Class SA
QUAD LOCATION
Discharge Codes 22 Ocracok San eSanitary District
Receiving Stream Pamlico Sound Hyde Count
Design Q •0.45 MGD
Permit expires 12/31/02 County
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OCRACOKE SANITARY DISTRICT
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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- 1277
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 - $12.83 / 1,000 GALLONS
REVERSE OSMOSIS UNITS - 9
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 40 HSP MOTOR
PREFILTERS- 2 EACH HAS 21 3 UM FILTERS 30" LONG 2" DIAMETER
WELLS-ONLY 1 WELL USED AT A TIME/ WELL 1 CONNECTED TO EMERGENCY GENERATOR
WELL #1 - PUMP 40' DEEP 600 GPM
WELL #2 - PUMP 80' DEEP 1,000 GPM
WELL #3 - PUMP 80' DEEP 1,000 GPM
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.
USDSI AlAI AR\

OCRACOKE SANITARY DISTRICT FLOW CHART
11:1
DRILL DEPTH 620'
PUMP DEPTH 40'
mum i 4 _♦— YEAR ROUND TEMP 73 F
pH 75
WELL# TDS 3600
OSD only uses ONE WELL
3°m at a rI MIE
s '' 9 HIGH PRESSURE PUMPS 40 HP
MOTORS OUTLET PRESSURE OF
►::111` HPP 388 PSIG
MOTOR
9 RO UNITS 21 MEMBRANES EACH 65eie
P PRODUCT;35%REJECT ,..}�r
r
d* R
1 It t ♦ J REJECT WATER(WASTE)IS
ice._ ^ E
PUT IN THE PAMLICO SOUND
� .. DT 2 / DT 1 C
t T
1)0,000
0A GAS./ Ip 200 ADO GALS }I �. •
DETENTION i
TAB \ TANK
---.,._ - _- System I re s s ux e ELEVA t 150,000 GALS
0 G:lisir �: 130 ft.tall
4 4 NI 128RfW1
01,,,A d 100 ft empty
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