NC0041530_Fact Sheet_20210202

Fact Sheet
NPDES Permit No. NC0041530
Permit Writer/Email Contact: Derek Denard / [e-mail]
Date: 02Feb2021
Division/Branch: NC Division of Water Resources/Water Quality Permitting Section
Compliance & Expediated Permitting Branch
Permitting Action:
Renewal
❑ Renewal with Expansion
❑ New Discharge
❑ Modification (Fact Sheet should be tailored to mod request)
See Permit Application Attachment A: NC0041530 Renewal (Application)_20190411_10p
Complete applicable sections below. If not applicable, enter NA.
1. Basic Facility Information
Facility Information
Applicant/Facility Name:
Ocracoke Sanitary District
Ocracoke Reverse Osmosis Water Treatment Plant (WTP)
Applicant Address:
PO Box 567, Ocracoke, NC 27960
Facility Address:
159 Water Plant Road, Ocracoke, NC 27960
Permitted Flow:
Not limited
Facility Type/Waste:
Water Plants and Water Conditioning Discharge — Reverse Osmosis
(RO) Concentrate and Softener Regeneration — Membrane Technology
WTP System
Facility Class:
Grade I Physical Chemical WPCS
Treatment Units:
Not Applicable
Pretreatment Program (Y/N)
No
County:
Hyde
Region
Washington
Briefly describe the proposed permitting action and facility background: This facility is a reverse osmosis
(RO) - membrane technology water treatment system with discharge of wastewaters consisting of RO
concentrate with a design potable flowrate of 0.900 MGD of high purity water, a backwash or reject flow
rate of 0.45 MGD and a maximum monthly average reject flow rate of 0.184 MGD [See Attachment B].
Page 1 of 10

Chemical usage consists of the following:
VITEC 1400 Antiscalant (for information see Attachment C for MSDS) and zinc phosphate.
2. Receiving Waterbodv Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 / Mary Ann's Pond (Pamlico Sound)
Stream Segment:
29-89
Stream Classification:
SA; HQW
Drainage Area (mi2):
NA
Summer 7Q10 (cfs)
Tidal
Winter 7Q10 (cfs):
Tidal
30Q2 (cfs):
Tidal
Average Flow (cfs):
Tidal
IWC (% effluent):
NA
303(d) listed/parameter:
Not listed [See Attachment D_2018 NC Integrated Report
072519 p1315]
Subject to TMDL/parameter:
Tar River TMDL / Nitrogen, Phosphorus
Basin/Sub-basin/HUC:
Tar -Pamlico / 03-03-08 / 030201050207
USGS Topo Quad:
Ocracoke, NC
Page 2of10

3. Effluent Data Summary
Effluent data for Outfall 001 is summarized below for the period of Jun2017 through Jun2020.
Table. Effluent Data Summary Outfall 001 (Compete table below or insert Excel Pivot Table.)
Parameters Max Min Average Count PQL MA
Conductivity 17200 14500 16541.7 12
Copper, Total (as Cu) 10 10 10 12 10
Flow, in conduit or thru treatment plant 0.2933 0.0018 0.1040 1112
Nitrite plus Nitrate Total (as N) 0.06 0.04 0.04 12 0.04
Nitrogen, Ammonia Total (as N) - Concentration 9.04 5.48 6.18 12
Nitrogen, Kjeldahl, Total (as N) 11.35 4.74 7.60 12
Nitrogen, Total - Concentration 11.39 4.8 7.65 12
Oxygen, Dissolved (DO) 8.22 4.09 5.69 41
pH 7.6 7 74
Phosphorus, Total (as P) - Concentration 0.87 0.2 0.37 12!
Salinity 10.1 8.4 9.7 12
Solids, Total Dissolved 11650 9060 10376.7 12 _
Turbidity 6.7 0.16 1.68 41 1 25*
DM UoM
pmhos/cm
pg/I
mgd
mg/I
mg/I
mg/I
mg/I
mg/I
su
mg/I
ppth
mg/I
25* ntu
6.8-8.5
PQL - Practical Quantitation Limit, MA - Monthly Average, DM - Daily Max, UoM - Units of Measurement,
= previous permit limits
4. Instream Data Summary
Instream monitoring may be required in certain situations, for example: 1) to verify model predictions
when model results for instream DO are within 1 mg/1 of instream standard at full permitted flow; 2) to
verify model predictions for outfall diffuser; 3) to provide data for future TMDL; 4) based on other
instream concerns. Instream monitoring may be conducted by the Permittee, and there are also
Monitoring Coalitions established in several basins that conduct instream sampling for the Permittee (in
which case instream monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize any instream data and what instream monitoring will be proposed for this
permit action: NA.
Is this facility a member of a Monitoring Coalition with waived instream monitoring (Y/N): No.
Name of Monitoring Coalition: NA.
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): No compliance issues with
effluent limits have been noted.
Summarize the compliance record with aquatic toxicity test limits and any second species test results
(past 5 years): The facility experienced two (2) toxicity failures in November 2019 and December 2019.
Then Jan 2020, Feb 2020, March 2020, and May 2020 were all passed. [See Attachment E: WET
Testing Self Monitoring Summary HQ May 2020_p83]
Summarize the results from the most recent compliance inspection: No compliance issues were noted
from the August 15, 2019 inspection. [See Attachment F]
Page 3of10

6. Water Quality -Based Effluent Limitations (WQBELs)
Dilution and Mixing Zones
In accordance with 15A NCAC 2B.0206, the following streamflows are used for dilution considerations
for development of WQBELs: 1Q10 streamflow (acute Aquatic Life); 7Q10 streamflow (chronic Aquatic
Life; non -carcinogen HH); 30Q2 streamflow (aesthetics); annual average flow (carcinogen, HH).
If applicable, describe any other dilution factors considered (e.g., based on CORMIX model results): NA.
If applicable, describe any mixing zones established in accordance with 15A NCAC 2B. 0204(b): NA.
Oxygen -Consuming Waste Limitations
Limitations for oxygen -consuming waste (e.g., BOD) are generally based on water quality modeling to
ensure protection of the instream dissolved oxygen (DO) water quality standard. Secondary TBEL limits
(e.g., BOD= 30 mg/1 for Municipals) may be appropriate if deemed more stringent based on dilution and
model results.
If permit limits are more stringent than TBELs, describe how limits were developed: NA.
Ammonia and Total Residual Chlorine Limitations
Limitations for ammonia are based on protection of aquatic life utilizing an ammonia chronic criterion of
1.0 mg/1 (summer) and 1.8 mg/1 (winter). Acute ammonia limits are derived from chronic criteria,
utilizing a multiplication factor of 3 for Municipals and a multiplication factor of 5 for Non -Municipals.
Limitations for Total Residual Chlorine (TRC) are based on the NC water quality standard for protection
of aquatic life (17 ug/1) and capped at 28 ug/1(acute impacts). Due to analytical issues, all TRC values
reported below 50 ug/1 are considered compliant with their permit limit.
Describe any proposed changes to ammonia and/or TRC limits for this permit renewal: No changes.
Reasonable Potential Analysis (RPA) for Toxicants
If applicable, conduct RPA analysis and complete information below.
The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality
standards, a statistical evaluation that is conducted during every permit renewal utilizing the most recent
effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44 (d) (i). The NC
RPA procedure utilizes the following: 1) 95% Confidence Level/95% Probability; 2) assumption of zero
background; 3) use of Y2 detection limit for "less than" values; and 4) streamflows used for dilution
consideration based on 15A NCAC 2B.0206. Effective April 6, 2016, NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards, dated June 10, 2016.
A reasonable potential analysis was conducted on effluent toxicant data collected between Jun2017
through Jun2020. Pollutants of concern included toxicants with positive detections and associated water
quality standards/criteria. Based on this analysis, the following permitting actions are proposed for this
permit:
Page 4of10

• Monitoring Only. The following parameters will receive a monitor -only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/criteria.
All data for Total Copper was reported as no detection, <10 µg/L. Compliance with permit limit
for Total Copper was not demonstrated with a PQL of 10 jig/L. A PQL of 2 µg/L or less would
better demonstrate compliance.
If applicable, attach a spreadsheet of the RPA results [See Attachment G] as well as a copy of the
Dissolved Metals Implementation Fact Sheet for freshwater/saltwater [See Attachment H] to this Fact
Sheet. Include a printout of the RPA Dissolved to Total Metal Calculator sheet if this is a Municipality
with a Pretreatment Program.
Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several
exceptions. The State has received prior EPA approval to use an Alternative WET Test Procedure in
NPDES permits, using single concentration screening tests, with multiple dilution follow-up upon a test
failure.
Describe proposed toxicity test requirement: Acute Whole Effluent Toxicity (WET) testing - testing of
Mysidopsis bahia (Mysid shrimp) shall be performed as 24-day pass/fail test at 90% effluent
concentration, during February, May, August and November [See A. (2.)].
Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012. The TMDL target was to comply with
EPA's mercury fish tissue criteria (0.3 mg/kg) for human health protection. The TMDL established a
wasteload allocation for point sources of 37 kg/year (81 lb/year), and is applicable to municipals and
industrial facilities with known mercury discharges. Given the small contribution of mercury from point
sources (-2% of total load), the TMDL emphasizes mercury minimization plans (MMPs) for point source
control. Municipal facilities > 2 MGD and discharging quantifiable levels of mercury (>1 ng/1) will
receive an MMP requirement. Industrials are evaluated on a case -by -case basis, depending if mercury is a
pollutant of concern. Effluent limits may also be added if annual average effluent concentrations exceed
the WQBEL value (based on the NC WQS of 12 ng/1) and/or if any individual value exceeds a TBEL
value of 47 ng/1
Describe proposed permit actions based on mercury evaluation: NA.
Other TMDL/Nutrient Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation within
this permit: This facility is not a member of the Tar Pamlico Basin Association. The appropriate special
condition text will be added. TN and TP quarterly monitoring are required because of the Tar River TMDL
for Nitrogen, Phosphorus.
Page 5 of 10

Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs: NA.
If applicable, describe any special actions (HQW or ORW) this receiving stream and classification shall
comply with in order to protect the designated waterbody: Mary Ann's Pond (Pamlico Sound) is currently
classified SA; HQW. As a safety factor, one-half the normal standard was used in the RPA for toxicant
limitations.
If applicable, describe any compliance schedules proposed for this permit renewal in accordance with
15A NCAC 2H.0107(c) (2) (B), 40CFR 122.47, and EPA May 2007 Memo: NA.
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215.3(e) and 15A NCAC 2B. 0226 for this permit renewal: NA.
7. Technology -Based Effluent Limitations (TBELs)
Not applicable
8. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit
must document an effort to consider non -discharge alternatives per 15A NCAC 2H.0105( c)(2). In all
cases, existing instream water uses and the level of water quality necessary to protect the existing use is
maintained and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results: NA.
9. Antibacksliding Review:
Sections 402(o)(2) and 303(d)(4) of the CWA and federal regulations at 40 CFR 122.44(1) prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
reissued permit to be as stringent as those in the previous permit, with some exceptions where limitations
may be relaxed (e.g., based on new information, increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit (YES/NO): YES.
If YES, confirm that antibacksliding provisions are not violated: Acute WET Testing relaxed to
monitoring based on WTP permitting strategy.
10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following
regulations and guidance: 1) State Regulation for Surface Water Monitoring, 15A NCAC 2B.0500; 2)
Page 6 of 10

NPDES Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo); 3) NPDES Guidance,
Reduced Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best
Professional Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not
considered effluent limitations under Section 402(o) of the Clean Water Act, and therefore anti -
backsliding prohibitions would not be triggered by reductions in monitoring frequencies.
For instream monitoring, refer to Section 4.
11. Electronic Reporting Requirements
The US EPA NPDES Electronic Reporting Rule was finalized on December 21, 2015. Effective
December 21, 2016, NPDES regulated facilities are required to submit Discharge Monitoring Reports
(DMRs) electronically. Effective December 21, 2020, NPDES regulated facilities will be required to
submit additional NPDES reports electronically. This permit contains the requirements for electronic
reporting, consistent with Federal requirements.
12. Summary of Proposed Permitting Actions:
A. Table. Current Permit Conditions and Proposed Changes — Outfall 001
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Flow
Monitor & Report
No change
15A NCAC 2B .0505
pH
6.8 — 8.5 SU
No change
WQBEL. State WQ standard, 15A
NCAC 2B .0200
Turbidity
Monitor & Report
No change from
previous. Draft was
2/month. For final
changed back to
monthly for
consistency with the
WTP permitting
strategy for non -
limited parameters
WQBEL. State WQ standard, 15A
NCAC 2B .0200
Dissolved Oxygen
(DO)
Monitor & Report
No change
WQBEL. State WQ standard, 15A
NCAC 2B .0200
Salinity
Monitor & Report
No change
WQBEL. State WQ standard, 15A
NCAC 2B .0200
Conductivity
Monitor & Report
No change
Parameter of Concern WTP
Permitting Strategy
Total Dissolved Solids
(TDS)
Monitor & Report
No change
Parameter of Concern WTP
Permitting Strategy
Page 7 of 10

Ammonia Nitrogen
Monitor & Report
No change
WQBEL. Based on protection of
State WQ criteria. 15A NCAC
2B.0200
TKN
NO3-N + NO2-N
TN
Monitor & Report
No change
WQBEL. Required individual
TN/TP nutrient limits per 2015 Tar-
Pamlico permitting strategy, and to
comply with NC chl-a WQS. 15A
NCAC 2B.0200
Total Phosphorus
Monitor & Report
No change
WQBEL. Required individual
TN/TP nutrient limits per 2015 Tar -
Pamlico permitting strategy and to
comply with NC chl-a WQS, 15A
NCAC 2B.0200.
Total Copper
Monitor & Report
No change
WQBEL. State WQ standard, 15A
NCAC 2B .0200
Total Zinc
Not required
Added monitoring
WQBEL. State WQ standard, 15A
NCAC 2B .0200
Added because of usage of Zinc -
orthophosphate or Sweetwater
CP1236 base on WP Permitting
strategy. For final changed to
optional since it is added only to
potable water as a corrosion
inhibitor.
Acute WET Testing
Limited
Changed to
Monitoring only
Acute WET Testing relaxed to
monitoring only based on WTP
permitting strategy.
WQBEL. No toxics in toxic
amounts. 15A NCAC 2B.0200 and
15A NCAC 2B.0500
ELECTRONIC
REPORTING OF
MONITORING
REPORTS
Required
Updated
In accordance with EPA Electronic
Reporting Rule 2015.
PERMIT RE-
OPENER: WHOLE
EFFLUENT
TOXICITY
Required
No change
WTP permitting strategy
PERMIT RE-
OPENER: NUTRIENT
REDUCTION
REQUIREMENT
Required
No change
Tar -Pamlico Nutrient Sensitives
Waters (NSW) Implementation
Strategy
MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max
Page 8 of 10

The draft permit includes the following significant changes from the existing permit:
1. The facility classification Physical Chemical Not Classified Water Pollution Control System (WPCS)
was added to the effluent page.
2. Acute WET Testing relaxed to monitoring only based on WTP permitting strategy.
3. Since the renewal application indicated the use of Zinc -orthophosphate or sweetwater CP1236,
quarterly Total Zinc monitoring was added.
13. Public Notice Schedule:
Permit to Public Notice: September 1, 2020 [See Attachment I]
Per 15A NCAC 2H .0109 & .0111, The Division will receive comments for a period of 30 days following
the publication date of the public notice. Any request for a public hearing shall be submitted to the
Director within the 30 days comment period indicating the interest of the party filing such request and the
reasons why a hearing is warranted.
14. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed (Yes/No): Yes.
If Yes, list changes and their basis below:
This final permit includes the following changes from the draft permit previously sent to you on August
13, 2020.
1. Monitoring for Turbidity has been changed from 2/Month to Monthly for consistency with the
WTP permitting strategy for non -limited parameters.
2. Total Zinc monitoring has been changed to optional since it is added only to potable water as a
corrosion inhibitor. The following footnote has been added:
Zinc: This requirement applies only to wastewater discharges that use water treated with
zinc orthophosphate.
Page 9 of 10

15. Fact Sheet Attachments (list in order of reference):
A. NC0041530 Renewal (Application)_20190411_10p
B. B_NC0041530 DMR Flow Data_Jun2017_Jun2020_lp
C. MSDSus-avista-sds-vitec1400v10.201611p
D. 2018 NC Integrated Report 072519 p1315
E. WET Testing Self Monitoring Summary HQ May 2020 p83
F. NC0041530 Compliance Report _20190816_5p
G. NC0041530 RPA 2020_4p
H. Fact Sheet Memo SW - Final 6-24-20163p
I. Ocracoke Observer _20200901_lp
J. Peer Review Mail_20200807_lp
K. Permittee Comments Electronic Transmittal Approval_20200813_3p
L. Permittee Receipt of final_ Electronic Transmittal_2p
Page 10 of 10

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
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
NORTH CAROLINA
Environmental Quality
April 23, 2019
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,
Wren Thed ord
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application
North Carobna Department of Environmental Quality I DivSan of Water Resources
Washington Regional Office 1943 Washington Square Mali I Washington, North Cs67ur6s 27889
252-94S-34S i

OCRACOKE SANITARY DISTRICT
P. O. BOX 567 OFFICE 252-928-5791
#159 WATER PLANT ROAD PLANT/FAX [phone]
OCRACOKE, NC 27960
April 11, 2019
NC DENR
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Permit Number NC0041530, Ocracoke Sanitary District, Hyde County
APR 232019
Water Resources
PsrmitZing Section
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

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
Facility Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
OCRACOKE SANITARY DISTIRCT
OCRACOKE SANITARY DISTRICT
P. O. BOX 567, 159 WATER PLANT ROAD
OCRACOKE
NORTH CAROLINA, 27960
252-928-5791
252-928-6651
Ocracokeh2oavahoo. 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
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
OCRACOKE SANITARY DISTRICT BOARD OF COMMISSIONERS
P. O. BOX 567
OCRACOKE
NORTH CAROLINA, 27960
252-928-5791
252-928-6651
Page 1 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.
1 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: 1
Outfall Identification number(s) OU 1_
10. Frequency of discharge:
Continuous 1 1 Intermittent X
If intermittent:
Days per week discharge occurs: _ i 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
Iron sulfate / ferrous sulfate
Fluoride Yes No X
Ammonia nitrogen / Chloramines
Yes No X
Yes No X
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 D 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:
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 4of4
Version 5/2012

Permit #NC0041530 Ocracoke Sanitary District Hyde County NC
LOCATION MAP
ROAD CLASSIFICATION
PRIMARY HIGHWAY
HARD SURFACE
LIGHT-CUTY ROAD, HARD OR
IMPROVED SURFACE
SECONDARY HIGHWAY
HARD SURFACE Cap UNIMPROVED ROAD
Latitude 35°06'58"
Map # C35sW
Stream Class
Longitude
Sub -basin
SA
75°59'19"
30155
Discharge Codes 22
Receiving Stream Pamlico Sound
Design Q 0.45 MGD Permit expires 12/31/02
SCALE 1:24 000
a'�N<hMC`.Y�\q' <a`M`A\CtM:ttCr•r.. F:�:a�.:::�i:v.:�:a'..
1 C
15zr—sii
CONTOUR INTERVAL 5 FEET
QUAD LOCATION
1 MILE
mvrsaxaroaca�a\ce
7000 FEET
1 KILOMETER
Ocracoke Sanitary District
NC0041530
Hyde County

OCRACOKE SANITARY DISTRICT
P. O. BOX 567 OFFICE 252-928-5791
#159 WATER PLANT ROAD PLANT/FAX [phone]
OCRACOKE, NC 27960
SUMMARY OF OCRACOKE SANITARY DISTRI(1
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 PRODUL I ION - 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 SEC I ION 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

P
r
11
c
t
i
RAW
OCRACOKE SANITARY DISTRICT FLOW CHART
HPP
MOTOR
DRILL DEPTH 620 '
PUMP DEPTH 40 '
YEAR ROUND TEMP 73 F
pH "5
TDS 3600
OSD only uses ONE WELL
at a TL'4IE
9 HIGH PRESSURE PUMPS 40 HP
MOTORS OUTLET PRESSURE OF
388 PSIG
9 RO UNITS 21 MEMBRANES EACH 65%
PRODUCT; 35% REJECT
DT 2
200,000 GALS
DETENTION
TANK
v.
► HSP I
1 VFDat523Hz
0 HSP 2
DT I
200.000 GALS 1
DETENTION f
TANK
System Pressure
55 psiz
•
►
R
E
J
E
C
T
LEVA
Nit
AIREJECT WATER (WASTE) IS
PUT IN THE PAMLICO SOUND
Annimmomm♦
150.000 GALS
130 ft. tall
128 ft full
100 fi empty
MkIER
OM
.a
MINI
E.

Parameter Flow, in conduit or thru treatment plant
Row Labels Average of Measurement
2017
Jun 0.1430
Jul 0.1558
Aug 0.1237
Sep 0.1026
Oct 0.0991
Nov 0.0734
Dec 0.0640
2018 _
Jan 0.0793
Feb 0.0508
Mar 0.0649
Apr 0.0912
May 0.1161
Jun 0.1604
Jul 0.1766
Aug 0.1536
Sep 0.0926
Oct 0.1011
Nov 0.0832
Dec 0.0684
2019
Jan 0.0679
Feb 0.0497
Mar 0.0626
Apr 0.1013
May 0.1234
Jun 0.1639
Jul 0.1838
Aug 0.1667
Sep 0.1202
Oct 0.0781
Nov 0.0742
Dec 0.0662
2020
Jan 0.0776
Feb 0.0811
Mar 0.0847
Apr 0.0703
May 0.1114
Jun 0.1440
Max Monthly Avg 0.1838

4 t A -vista Vitec® 1400
T EC H N 0 LOG I ES SAFETY DATA SHEET
1. Company and Product Identification
Identification — Product Name:
Other means of identification
Synonym:
Recommended Use of the Chemical
and Restrictions On Use:
Name, Address, And Telephone Number of the
Manufacturer, or Other Responsible Party:
1.4
Competent Person email address
24 Hour Emergency No.:
1.5
CERTIFIED BY NSF INTERNATIONAL TO NSF/ANSI 60 AS
STANDARD DRINKING WATER TREATMENT CHEMICAL FOR USE IN
REVERSE OSMOSIS SYSTEMS AT A MAXIMUM LEVEL OF 30 mg/I.
NsFeArvel so
Vitec® 1400
Organic Amine salt
Mixture, none
Reverse osmosis membrane online antiscalant
Use only as directed on the label.
AVISTA TECHNOLOGIES
140 Bosstick Street
San Marcos, CA 92069
[phone]
[e-mail]
1-800-424-9300 (United States)
1-703-527-3887 (International Collect)
2. HAZARDS IDENTIFICATION
EMERGENCY OVERVIEW: This product is a clear, colorless to amber liquid. Depending on the duration of contact, over-
exposures can be harmful to the skin or eyes and respiratory system, or cause injury. This product is neither reactive nor
flammable. Thermal decomposition of this product produces irritating vapors and toxic gases (e.g. carbon monoxide, carbon
dioxide, oxides of nitrogen and sodium). Emergency responders must wear personal protective equipment (and have
appropriate fire -extinguishing protection) suitable for the situation to which they are responding.
Physical Hazards Summary
Potential Health Hazards Summary
Potential Ecological Effects Summary
2.1 Classification Of Product
U.S. OSHA classification
Classification as per EC
1272/2008
(CLP/GHS)
WHMIS classification
None
Acute toxicity, oral, Category 4
Acute toxicity, dermal, Category 4
None
Acute toxicity,
Acute toxicity,
Acute toxicity,
Acute toxicity,
Xi Irritant
Acute toxicity,
Acute toxicity,
oral, Category 4
dermal, Category 4
oral, Category 4
dermal, Category 4
oral, Category 4
dermal, Category 4
Vitec® 1400 PUBLIC GHS SDS
PAGE 1 OF 11

Hazardous Materials Information
System (HMIS) Rating
2.2 Label Elements OSHA/GHS
General Warnings
Signal Word
Hazard statements
P101 If medical advice is needed, have product container or label at hand.
P102 Keep out of reach of children.
P103 Read label before use
P403 Store in a well -ventilated place.
P233 Keep container tightly closed
WARNING
H317 Harmful in contact with skin
H312 Harmful if inhaled
Precautionary statements P280
P305
P351
P338
P310
Hazard pictograms
2.3 Unclassified Hazards None
2.4 Ingredients with unknown acute None
toxicity
Wear protective gloves/protective clothing/eye protection/face
protection.
IF IN EYES: Rinse cautiously with water for several minutes.
Remove contact lenses, if present and easy to do. Continue rinsing
Rinse cautiously with water for several minutes.
Remove contact lenses, if present and easy to do. Continue rinsing.
IF INGESTED or INHALED Immediately call a POISON CENTER
or doctor/physician.
Vitec° 1400 PUBLIC GHS SDS PAGE 2 OF 11

3. COMPOSITION and INFORMATION ON INGREDIENTS
Chemical name
CAS #
EINECS #
% w/w
US OSHA
GHS/EU CLP
WHMIS
Chelate agent 1
Proprietary
Proprietary
10 - 15
Acute toxicity, oral,
Category 3
Acute toxicity, dermal,
Category 3
Skin Corrosive category
1B
Serious eye damage,
category 1
Acute toxicity, oral,
Category 3
Acute toxicity, dermal,
Category 3
Skin Corrosive category 1B
Serious eye damage,
category 1
Acute toxicity, oral,
Category 3
Acute toxicity, dermal,
Category 3
Skin Corrosive category
1B
Serious eye damage,
category 1
Chelate agent 2
Proprietary
Proprietary
5 - 10
Severe skin corrosion
Category 1
Serious Eye Damage
Category 1
Metal Corrosion,
Category 1
H314 Causes severe skin
bums and eye damage
H319 Causes serious eye
damage
H290 May cause
corrosion to metals.
P261 Avoid breathing
dust/ fume/ gas/ mist/
vapours/ spray.
P305 + P351 + P338 IF
IN EYES: Rinse
cautiously with water
for several minutes.
Remove contact lenses,
if present and easy to
do. Continue rinsing.
Severe skin corrosion
Category 1
Serious Eye Damage
Category 1
Metal Corrosion, Category 1
H314 Causes severe skin
bums and eye damage
H319 Causes serious eye
damage
H290 May cause corrosion
to metals.
P261 Avoid breathing dust/
fume/ gas/ mist/ vapours/
spray.
P305 + P351 + P338 IF IN
EYES: Rinse cautiously
with water for several
minutes. Remove contact
lenses, if present and easy
to do. Continue rinsing.
Severe skin corrosion
Category 1
Serious Eye Damage
Category 1
Metal Corrosion,
Category 1
H314 Causes severe skin
burns and eye damage
H319 Causes serious eye
damage
H290 May cause
corrosion to metals.
P261 Avoid breathing
dust/ fume/ gas/ mist/
vapours/ spray.
P305 + P351 + P338 IF
IN EYES: Rinse
cautiously with water for
several minutes. Remove
contact lenses, if present
and easy to do. Continue
rinsing.
PRODUCT
Acute toxicity, oral, Category 4
Acute toxicity, dermal, Category 4
NE = Not Established. C = Ceiling Limit. See Section 16 for Definitions of Terms Used.
4. FIRST -AID MEASURES
4.1 Description of Necessary Measures
Skin exposure: If this product contaminates the skin, immediately begin decontamination with
running water. Remove exposed or contaminated clothing, taking care not to
contaminate eyes. Victim should seek immediate medical attention if any
adverse exposure symptoms develop.
Eye exposure: If this product enters the eyes, open victim's eyes while under gently running
water. Use sufficient force to open eyelids. Have victim "roll" eyes Minimum
flushing is for 15 minutes. Victim must seek medical attention.
Inhalation: If mist of this product are inhaled, remove victim to fresh air. If necessary, use
artificial respiration to support vital functions. Remove or cover gross
contamination to avoid exposure to rescuers.
Ingestion: If this product is swallowed, CALL PHYSICIAN OR POISON CONTROL
CENTER FOR MOST CURRENT INFORMATION. DO NOT INDUCE
VOMITING. Have victim rinse mouth with water, if conscious. Never induce
vomiting or give a diluent (e.g., water) to someone who is unconscious, having
convulsions, or unable to swallow. If contaminated individual is convulsing,
maintain an open airway and obtain immediate medical attention.
Vitec° 1400 PUBLIC GHS SDS PAGE 3 OF 11

4.2 Most Important Symptoms/Effects: Immediate: Inhalation exposure may cause coughing or sneezing. Symptoms
of skin and eye contact may include redness and irritation. Ingestion may cause
stomach pains, cramps, and gastritis.
Delayed: Prolonged or repeated skin overexposure to this product may cause
dermatitis (dry, red skin). Symptoms may include tingling, redness, and visible
injury.
4.3 Indication Of Immediate Medical TARGET ORGANS: Acute: Skin, eyes, respiratory system.
Attention And Special Treatment Needed, Chronic: Skin, eyes, respiratory system
If Necessary:
Victims of chemical exposure must be taken for medical attention if any adverse effects occur. Rescuers should be taken for medical
attention if necessary. Take a copy of label and SDS to physician or health professional with victim.
5. FIRE -FIGHTING MEASURES
Flammable properties Non-flammable aqueous
solution
5.1 Suitable And Unsuitable
Extinguishing Media:
5.2 Specific Hazards Arising From Chemical:
5.3 Special Protective Equipment And
Precautions For Fire -Fighters:
Flash Point °C: Not applicable.
NFPA RATING
FLAMMABILITY
HEALTH
OTHER
See Section 16 for
definitions of ratings
REACTIVITY
Autoignition Temperature °C: Not applicable.
Flammable Limits (in air by volume, %):
Upper: Not applicable.
Lower: Not applicable.
This material will not contribute to the intensity of a fire. Use extinguishing
material suitable to the surrounding fire.
Water spray YES Carbon dioxide YES
Foam YES Dry chemical YES
Halon YES Other YES
When involved in a fire, this material may decompose and produce irritating
fumes and toxic gases (e.g., carbon monoxide, carbon dioxide, and nitrogen
oxides).
Explosion Sensitivity to Mechanical Impact: Not applicable.
Explosion Sensitivity to Static Discharge: Not applicable.
Incipient fire responders should wear eye protection. Structural firefighters must
wear Self -Contained Breathing Apparatus and full protective equipment. Move
containers from fire area if it can be done without risk to personnel. If possible,
prevent runoff water from entering storm drains, bodies of water, or other
environmentally sensitive areas.
Vitec° 1400 PUBLIC GHS SDS PAGE 4 OF 11

6. ACCIDENTAL RELEASE MEASURES
6.1 Personal Precautions Uncontrolled releases should be responded to by trained personnel using pre -
planned procedures. Proper protective equipment should be used. In case of a
spill, clear the affected area and protect people.
Protective equipment For small releases (< 20 L), clean up spilled liquid wearing gloves, goggles,
faceshield, and suitable body protection. The minimum Personal Protective
Equipment recommended for response to non -incidental releases (more than 20
L) should be Level C: triple -gloves (neoprene gloves and nitrile gloves over
latex gloves), chemical resistant suit and boots, hard hat, and full -face respirator
with Amine and HEPA filter.
Emergency procedures Monitoring must indicate that exposure levels are below those provided in
Section 8 (Exposure Controls -Personal Protection) and that oxygen levels are
above 19.5% before anyone is permitted in the area without Self -Contained
Breathing Apparatus.
6.2 Methods and Materials for Containment Vacuum or soak- up liquid for recovery/disposal. Neutralize residue with
and Cleaning Up sodium bicarbonate or other neutralizing agent for acids. Decontaminate the
area thoroughly. Test area with litmus paper to ensure neutralization. Place
all spill residues in a suitable plastic container. Dispose of in accordance with
applicable U.S. Federal, State, or local procedures, or appropriate local
standards (see Section 13, Disposal Considerations).
7.1 Precautions for Safe Handling
7.2 Conditions For Safe Storage
7. HANDLING and STORAGE
All employees who handle this material should be trained to handle it safely. Open containers
carefully on a stable surface. Empty containers may contain residual liquid; therefore,
empty containers should be handled with care.
As with all chemicals, avoid getting this product ON YOU or IN YOU. Wash thoroughly
after handling this product. Do not eat or drink while handling this material. Avoid
generating dust of this product. Remove contaminated clothing immediately.
During equipment maintenance follow practices indicated in Section 6 (Accidental Release
Measures) to decontaminate equipment or clean-up small spills. Make certain that
application equipment is locked and tagged -out safely if necessary. Collect all rinsates and
dispose of according to applicable U.S. Federal, State, or local procedures or appropriate
local standards.
Store containers in a cool, dry location, away from direct sunlight, sources of intense heat, or
where freezing is possible. Store away from incompatible materials. Material should be
stored in secondary containers, or in a diked area, as appropriate. Storage and use areas
should be covered with impervious materials. Keep container tightly closed when not in
use. If appropriate, post warning signs in storage and use areas. Inspect all incoming
containers before storage, to ensure containers are properly labeled and not damaged.
Incompatibilities Bases, oxidizers, metals
Vitec° 1400 PUBLIC GHS SDS PAGE 5 OF 11

8. EXPOSURE CONTROLS - PERSONAL PROTECTION
8.1 Control Parameters
CHEMICAL NAME
CAS #
% w/w
EXPOSURE LIMITS IN AIR
ACGIH-TLVs
OSHA-PELs
IDLH
mg/m3
OTHER
mg/m3
TWA
mg/m3
STEL
mg/m3
TWA
mg/m3
STEL
mg/m3
Chelate agent 1
Proprietary
10-15
NE
NE
NE
NE
NE
NE
Chelate agent 2
Proprietary
5-10
NE
NE
NE
NE
NE
NE
Water and other components which are present in
less than 1 percent concentration (0.1%
concentration for potential carcinogens,
reproductive toxins, respiratory tract sensitizers
and mutagens).
Balance
None of the other components contribute significant additional
in this product. All pertinent hazard information has been
requirements of the Federal Occupational Safety and Health
1910.1200), U.S. State equivalent Standards and Canadian
Identification System Standards (CPR 4).
hazards at the concentration present
provided in this document, per the
Administration Standard (29 CFR
Workplace Hazardous Materials
8.2 Appropriate Engineering Controls.
8.3 Personal Protective Equipment
Respiratory protection:
Eye protection:
Hand protection:
Body protection:
Use with adequate ventilation to ensure exposure levels are maintained below the
limits provided in this Section or as low as reasonably practical. Ensure
eyewash/safety shower stations are available near areas where this product is used.
None needed under normal conditions of use. Use NIOSH approved respirators if
ventilation is inadequate to control mists or vapor. If respiratory protection is needed,
use only protection authorized in the U.S. Federal OSHA Standard (29 CFR
1910.134), applicable U.S. State regulations, or the applicable local standards.
Oxygen levels below 19.5% are considered IDLH by OSHA. In such atmospheres,
use of a full -face piece pressure/demand SCBA or a full -face piece, supplied air
respirator with auxiliary self-contained air supply is required under OSHA' s
Respiratory Protection Standard (1910.134-1998).
Use approved safety goggles or safety glasses, as described in OSHA 29 CFR
1910.133. Splash goggles with a faceshield may be needed if splash hazards exist.
Wear chemical impervious gloves (e.g., SolvexTM, Neoprene).
If needed, use body protection appropriate for task (e.g., Tyvek suit, rubber apron) to
protect from splashes and sprays.
9. PHYSICAL and CHEMICAL PROPERTIES
Appearance
Odor
Freezing Point °C
Initial Boiling Point °C
Flammability
Vapor Density (air = 1)
Solubility (in water)
Viscosity
Decomposition Temperature
How To Detect This Substance
(Warning Properties):
This product is a clear, colorless to amber liquid.
Light disinfectant odor
<0
> 100
Non-flammable
N/A
Soluble
Similar to water
NE
Litmus paper will t
Odor Threshold
pH
Boiling Point Range °C
Evaporation Rate (water = 1)
Vapor Pressure mm Hg @ 20°C:
Relative density (water = 1)
Oil -Water Partition Coefficient
NE
4.1 — 4.7
N/A
Similar to water
18-20
1.05 — 1.10
N/A
urn orange -red in contact with solutions of this product.
Vitec° 1400 PUBLIC GHS SDS
PAGE 6 OF 11

10. STABILITY and REACTIVITY
10.1 Reactivity Not considered reactive.
10.2 Chemical Stability Stable
10.3 Possibility of hazardous reactions Hazardous polymerization will not occur.
10.4 Conditions to avoid Avoid mixing with incompatible materials.
10.5 Incompatible Materials Bases, oxidizers, metals
10.6 Hazardous Decomposition Products Thermal decomposition of this product may generate nitrogen oxides, carbon
monoxide and carbon dioxide.
11. TOXICOLOGICAL INFORMATION
Toxicity data for hazardous ingredients
Oral LD50 mg/kg
Dermal LD50 mg/kg
Inhalation LD50 mg/kg
Chelate agent 1
N/A
N/A
N/A
Chelate agent 2
LD50 (Oral -Rat) 2100 mg/kg
LD50 (Skin -Rabbit) > 6310 mg/kg
LD50 (Oral -Quail) > 2510 mg/kg
LD50 (Oral -Duck) > 2510 mg/kg
TDLo (Oral -Rat) 1302 mg/kg/31
days -intermittent: Kidney,
Urethra, Bladder: other changes in
urine composition; Nutritional and
Standard Draize Test (Skin -
Rabbit) 500 mg/24 hours
Standard Draize Test (Eye-
Rabbit) 100 mg: Moderate
N/A
Gross Metabolic: weight loss or
decreased weight gain, changes in
sodium.
12. ECOLOGICAL INFORMATION
ALL WORK PRACTICES MUST BE AIMED AT ELIMINATING ENVIRONMENTAL CONTAMINATION.
12.1
Ecotoxicity
LC50, mg/L
EC5o, mg/L
Product & Constituents
Aquatic
NE
NE
Terrestrial
NE
NE
12.2
Persistence and Degradability
The components of this product decompose in soil and water.
12.3
Bioaccumulative Potential
This product is not expected to bioaccumulate
12.4
Mobility in Soil
When spilled onto soil, this product will infiltrate downward, the rate being greater
with lower concentration because of reduced viscosity.
12.5
Other Adverse Ecological Effects
This product may be harmful to aquatic life
aquatic environment.
if large volumes of it are released into an
Vitec° 1400 PUBLIC GHS SDS
PAGE 7 OF 11

13. DISPOSAL CONSIDERATIONS
Preparing Wastes of this Product for Waste disposal must be in accordance with appropriate U.S. Federal, State, and local
Disposal regulations or with local regulations. This product, if unaltered by the handling, may
be disposed of by treatment at a permitted facility or as advised by your local waste
regulatory authority.
Disposal of Contaminated Packaging Cleaned containers can be recycled or disposed of as non -contaminated waste, if
authorized by your local authorities. Dispose of containers as required by local
regulations.
U.S. EPA Waste Number Not applicable if the product as supplied becomes a waste
14. TRANSPORT INFORMATION
THIS MATERIAL IS NOT HAZARDOUS AS DEFINED BY 49 CFR 172.101 BY THE U.S. DEPARTMENT OF TRANSPORTATION.
14.1 UN Number N/A
14.2 UN Proper Shipping Name N/A
14.3 Transport Hazard Class(es) N/A
Transport label(s) required N/A
14.4 Packing Group N/A
14.5 Marine Pollutant N/A
NA Emergency Response Guide N/A
Number (2012)
14.6 Transport in Bulk (Annex II of N/A
MARPOL 73/78 and IBC Code)
14.7 Special Transport Precautions N/A
National Motor Freight #70
Classification
International Air Transport Association
14.8 UN Number N/A
UN Proper Shipping Name N/A
Transport Hazard Class(es) N/A
Transport label(s) required N/A
Packing Group N/A
Packaging Instructions N/A
International Maritime Organization
14.9 UN Number N/A
UN Proper Shipping Name N/A
Transport Hazard Class(es) N/A
Transport label(s) required N/A
Packing Group N/A
Marine Pollutant N/A
NA Emergency Response Guide N/A
Number (2012)
Transport in Bulk (Annex II of N/A
MARPOL 73/78 and IBC Code)
Vitec° 1400 PUBLIC GHS SDS PAGE 8 OF 11

15. SAFETY, HEALTH and ENVIRONMENTAL REGULATIONS
SPECIFIC FOr THE PRODUCT
PROGRAM
Chelate agent 1
Chelate agent 2
US EPA PROGRAMS
Clean Air Act Hazardous
Air Pollutants
NO
NO
Safe Drinking Water Act
NO
NO
RCRA F, K, P, U or
D-lists
NO
NO
Epa Priority Pollutant
NO
NO
SARA 302 RQ
NO
NO
SARA 302 TPQ
NO
NO
SARA 313 LISTED
NO
NO
SARA CHEMICAL CATEGORIES
SARA 311/312 ACUTE
NO
NO
SARA 311/312
CHRONIC
NO
NO
SARA 311/312 FIRE
NO
NO
SARA 311/312
PRESSURE
NO
NO
SARA 311/312
NO
NO
REACTIVITY
EPA EXTREMELY
HAZARDOUS
SUB STANCE
NO
NO
CALIFORNIA
This product does not contain any chemical listed on the
California Safe Drinking Water Act list (Proposition 65)
US OSHA PROGRAMS
PEL
NO
NO
PSM
NO
NO
CHEMICAL SECURITY PROGRAMS
DHS CFATS
NO
NO
CHEMICAL WEAPONS CONVENTION
NO
NO
DEA Controlled
Substances
NO
NO
CF CAL INVEN QRY PROG$'
W HMIS NO
NO
DSL
YES
YES
REACH Pre -registered
List
YES
YES
TSCA
YES
YES
European Inventory of
Existing Commercial
Chemical Substances
(EINECS)
YES
YES
EU No -Longer Polymers
List (NLP)
N/A
N/A
EEC Classification
Packaging, and Labeling
of Dangerous
Substances(Annex 1)
NO
NO
Philippines
Japan
YES
YES
YES
YES
Vitec® 1400 PUBLIC GHS SDS PAGE 9 OF 11

Australia
YES
YES
Korea
YES
YES
China
YES
YES
New Zealand Inventory of
Chemicals
YES
YES
16.1 Original Preparation
16.2 Revision History
16. OTHER INFORMATION
9 Dec 2014
24 June 2016 OSHA, WHMIS GHS Update; format changes 08-05-
2016; Content corrections, October 7, 2016
16.3 Prepared by ADVANCED CHEMICAL SAFETY, Inc.
PO Box 152329
San Diego, CA 92195
(858)-874-5577
16.4 Date of Printing October 7, 2016
Vitec° 1400 PUBLIC GHS SDS PAGE 10 OF 11

DEFINITIONS OF TERMS
16.5
A large number of abbreviations and acronyms appear on a SDS. Some of these which are commonly used include the following:
Section 2
GHS: Global Harmonization System
OSHA: U.S. Occupational Safety and Health Administration.
CLP: Classification and Packaging
WHMIS: Workplace Hazardous Materials Information System
STOT: Specific Target Organ Toxicity
Section 3
CAS #: Chemical Abstract Service index number
EINECS #: European Chemical Substances Information System index number
Section 5
NFPA: Nation Fire Protection Association
Health Hazard: 0 (material that on exposure under fire conditions would offer no hazard beyond that of ordinary combustible
materials); 1 (materials that on exposure under fire conditions could cause irritation or minor residual injury); 2 (materials that
on intense or continued exposure under fire conditions could cause temporary incapacitation or possible residual injury); 3
(materials that can on short exposure could cause serious temporary or residual injury); 4 (materials that under very short
exposure could cause death or major residual injury). Flammability Hazard
Reactivity Hazard: Refer to definitions for "Hazardous Materials Identification System".
Flash Point: Minimum temperature at which a liquid gives off sufficient vapors to form an ignitable mixture with air.
Autoignition Temperature: The minimum temperature required to initiate combustion in air with no other source of ignition.
LEL: The lowest percent of vapor in air, by volume, that will explode or ignite in the presence of an ignition source. UEL:
The highest percent of vapor in air, by volume, that will explode or ignite in the presence of an ignition source.
Section 8
ACGIH - American Conference of Govemmental Industrial Hygienists, a professional association which establishes exposure
limits.
TLV - Threshold Limit Value - an airbome concentration of a substance which represents conditions under which it is generally
believed that nearly all workers may be repeatedly exposed without adverse effect. The duration must be considered, including
the 8-hour Time Weighted Average (TWA), the 15-minute Short Term Exposure Limit, and the instantaneous Ceiling Level
(C). Skin absorption effects must also be considered
PEL - Permissible Exposure Limit - This exposure value means exactly the same as a TLV, except that it is enforceable by
OSHA. The OSHA Permissible Exposure Limits are based in the 1989 PF.T s and the June, 1993 Air Contaminants Rule
(Federal Register: 58: 35338-35351 and 58: 40191). Both the current PELs and the vacated PELs are indicated. The phrase,
"Vacated 1989 PEL," is placed next to the PEL which was vacated by Court Order.
IDLH - Immediately Dangerous to Life and Health - This level represents a concentration from which one can escape within
30-minutes without suffering escape -preventing or permanent injury. The DFG - MAK is the Republic of Germany's
Maximum Exposure Level, similar to the U.S. PEL. NIOSH is the National Institute of Occupational Safety and Health, which
is the research ann of the U.S. Occupational Safety and Health Administration (OSHA). NIOSH issues exposure guidelines
called Recommended Exposure Levels (RELs). When no exposure guidelines are established, an entry of NE (Not
Established) is made for reference.
Section 11
LD50 : Lethal Dose (solids & liquids) which kills 50% of the exposed animals;
LCso : Lethal Concentration (gases) which kills 50% of the exposed animals;
ppm: Concentration expressed in parts of material per million parts of air or water;
mg/m3 : Concentration expressed in weight of substance per volume of air;
mg/kg: Quantity of material, by weight, administered to a test subject, based on their body weight in kg
IARC - the International Agency for Research on Cancer;
NTP - the National Toxicology Program,
RTECS - the Registry of Toxic Effects of Chemical Substances,
OSHA and CAL/OSHA.
IARC and NTP rate chemicals on a scale of decreasing potential to cause human cancer with rankings from 1 to 4. Subrankings
(2A, 2B, etc.) are also used.
TDLo, the lowest dose to cause a symptom and
TCLo the lowest concentration to cause a symptom;
TDo, LDLo, and LDo, or TC, TCo, LCLo, and LCo, the lowest dose (or concentration) to cause lethal or toxic effects.
BEI - Biological Exposure Indices, represent the levels of determinants which are most likely to be observed in specimens
collected from a healthy worker who has been exposed to chemicals to the same extent as a worker with inhalation exposure
to the TLV.
Section 12
LCso: The lowest concentration in water which kills 50% of the test subjects.
ECso: The Effect Concentration in water at which 50% of the test species if affected.
Section 13
US EPA Hazardous Waste Codes: refer to 40 CFR 261.20
Section 14
DOT: US Department of Transportation
IATA: International Air Transport Association
IMO: International Maritime Organization
MARPOL: International Convention for the Prevention of Pollution From Ships, 1973 as modified by the Protocol of 1978
IBC Code : Merchant Shipping Code
Section 15
RCRA: US Resource Conservation and Recovery Act
SARA: US Superfund Amendments and Reauthorization Act
PSM: US OSHA Process Safety Management
CFATS: US Department of Homeland Security Chemical Facility Anti -terrorism Standard
DSL: Canadian Domestic Substances List
NDSL: Canadian Non -Domestic Substances List
REACH: European Registration, Evaluation, Authorization and Restriction of Chemicals list
TSCA: US Toxic Substances Control Act
Vitec° 1400 PUBLIC GHS SDS
PAGE 11 OF 11

2018 NC Intergrated Report
Tar -Pamlico River Basin
Pamlico Sound Subbasin
03020105
11).EC:r.p
29-73-(2)b
Long Shoal River
From a line extending river 506 meters south of Deep Creek to Pamlico Sound excluding area at 5th Avenue Pump canal
Classification
SA; H QW
Length or Area
2,641
Units
S Acres
Previous AU Number
'arameter of Interes
=ategory Assessment Criteria StatusLCollection_Year
Fish Tissue Mercury (Nar, FC, NC)
Shellfish Growing Area Status (Fecal, SH, SA)
29-73-(2)c
4t
1
Exceeding Criteria
Meeting Criteria
2012
2010
Long Shoal River
DEH closed area at 5th Avenue pump canal
Classification
SA; H QW
Length or Area
35
Units
S Acres
Previous AU Number
rameter of Interest
Category Assessment Criteria Status Collection_Year
Fish Tissue Mercury (Nar, FC, NC)
Shellfish Growing Area Status (Fecal, SH, SA)
29-89
4t
5
Exceeding Criteria
Exceeding Criteria
2012
2010
Mary Anns Pond
Entire Pond
Classification
SA; H QW
Length or Area
3
Units
S Acres
Previous AU Number
�o ra Info i+
Category+
Fish Tissue Mercury (Nar, FC, NC)
Shellfish Growing Area Status (Fecal, SH, SA)
29-44-5-4
4t
1
Exceeding Criteria
Meeting Criteria
2012
12010
Middle Creek
From source to Deep Bay
Classification
SA; HOW
Length or Area
12
Units
S Acres
Previous AU Number
Parameter of Interest&
gory Assessment Criteria Status Collection_Year
Fish Tissue Mercury (Nar, FC, NC)
Shellfish Growing Area Status (Fecal, SH, SA)
4t
1
Exceeding Criteria
Meeting Criteria
2012
2010
7/23/2019 2018 NC Integrated Report Page 1315 of 1727

Whole Effluent Toxicity Testing and Self Monitoring Summary
• • • • • • • • • • •
•
• — • • — • • - • • - •
• - • • - • • - • • - •
• - • • - • • - • • - •
• - • • - • • - • • •
• - • • - • • • • • • •
— •
• • • • • • • • • • • •
• • • • • • • • • • • •
• • • • • • • • • • • •
• • • • • • • • • • • •
• • • • • • • • • • • •
• • • • • • • • • • • •
— — —
- - — •
• • • • • • • • • • • •
• • - • • - • • - • •
• • - • • - • • - • •
• • - • • - • • - • •
• • - • • - • • - • •
• • m • • • • • • • •
Ocracoke Sanitary District (RO) WTP NC0041530/001 County: Hyde Region: WARO Basin: Tar08 Feb May Aug Nov
Mysd24PF Begin: 6/1/2017 24hr Ac PF Limit: 90% NonComp: 7Q10: NA PF: 0.45 IWC: NA Freq: Q
SOC JOC:
2016
2017
2018
2019
2020
J
Pass
F M A M
Pass - - Pass
Pass - - Pass
Pass - - Pass
Pass - Pass
Pass Pass - Pass
J J
A
Pass
Pass
Pass
Pass
S O
N
Pass
Pass
Pass
Fail
Fail
—
- — — •
• • • • • • •• •• •• •• ••
• • — • • — • • • — • •
• • • • • • • •
• • • • • • • •
• • • • • • • •
• • • • • • • • • •
Legend: P= Fathead minnow (Pimphales promelas), H=No Flow (facility is active), s = Split test between Certified Labs
Page 83 of 122

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
David Tolson
Ocracoke Sanitary District
PO Box 567
Ocracoke, NC 27960-0567
NORTH CAROLINA
Environmental Quality
August 16, 2019
SUBJECT: Compliance Inspection Report
Ocracoke Reverse Osmosis WTP
NPDES WW Permit No. NC0041530
Hyde County
Dear Mr. Tolson:
The North Carolina Division of Water Resources conducted an inspection of the Ocracoke Reverse
Osmosis WTP on 8/15/2019. This inspection was conducted to verify that the facility is operating in
compliance with the conditions and limitations specified in NPDES WW Permit No. NC0041530. The
findings and comments noted during this inspection are provided in the enclosed copy of the inspection
report entitled "Compliance Inspection Report".
If you should have any questions, please do not hesitate to contact me with the Water
Quality Regional Operations Section in the Washington Regional Office at 252-946-6481 or via email at
[e-mail].
Sincerely,
Robbie Bullock, Environmental Specialist II
Water Quality Regional Operations Section
Washington Regional Office
Division of Water Resources, NCDEQ
Cc: Laserfiche
.D.IE 1, North Caro ea Department of Env+ronn erta Qi.ra ty I [Mason ofWate, Resources
,. Wash ngton Regora Dffce 1943Wash rgtor Square Mari I Wash rgtor, North Caro ra 27E59
4-::.: a.;; ._.. 252-846-6481

United States Environmental Protection Agency
EPA Washington, D.C. 20460
Water Compliance Inspection Report
Form Approved.
OMB No. 2040-0057
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection
1 IN 2 L 3 I NC0041530 111 12 I 19/08/15 I17
Type
18 [ j
IIIIIII11II
Inspector Fac Type
19 I G I 20I /j
291I1I11 111111111II III IIII I I IIIII
r6
Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 QA Reserved
67 1 I 70 Li711 1 72 N 73I I �74 751 I I I I I I 180
I I I I I
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
POTW name and NPDES Permit Number)
Ocracoke Reverse Osmosis WTP
NCSR 1324
Ocracoke NC 27960
Entry Time/Date
10:40AM 19/08/15
Permit Effective Date
17/06/01
Exit Time/Date
11:20AM 19/08/15
Permit Expiration Date
19/11/30
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Name, Address of Responsible OfficiaVTitle/Phone and Fax Number
Contacted
Lonnie R Burrus,PO Box 567 Ocracoke NC
279600567/Manager/252-928-5791/2529286651 No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit Records/Reports Self -Monitoring Program • Facility Site Review
Effluent/Receiving Waters Laboratory
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s) and Signature(s) of Inspector(s) Agency/Office/Phone and Fax Numbers Date
Robert Bullock Division of Water Quality//252-948-3924i y^/V / /
2.--4‘,/y(
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page# 1

NPDES yr/mo/day Inspection Type
NC0041530 111 21 19/08/15 117 18
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
The review period for this inspection was January 2015 through April 2019. There were no violations
over the review period.
The current permit was set to expire on November 30, 2019. The facility has submitted a renewal
application and the existing permit will remain effective until a new permit is issued.
The facility was judged to be COMPLIANT with NPDES permit NC0041530.
Page# 2

Permit: NC0041530
Inspection Date: 08/15/2019
Owner - Facility: Ocracoke Reverse Osmosis VVTP
Inspection Type: Compliance Evaluation
Permit Yes No NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new M ❑ ❑ ❑
application?
Is the facility as described in the permit? IM000
# Are there any special conditions for the permit? •❑ ❑ ❑
Is access to the plant site restricted to the general public? M ❑ ❑ ❑
Is the inspector granted access to all areas for inspection? III ❑ ❑ ❑
Comment: The current permit was set to expire on November 30, 2019. The facility has submitted a
renewal application and the existing permit will remain effective until a new permit is issued.
Record Keeping
Are records kept and maintained as required by the permit?
Is all required information readily available, complete and current?
Are all records maintained for 3 years (lab. reg. required 5 years)?
Are analytical results consistent with data reported on DMRs?
Is the chain -of -custody complete?
Dates, times and location of sampling
Name of individual performing the sampling
Results of analysis and calibration
Dates of analysis
Name of person performing analyses
Transported COCs
Are DMRs complete: do they include all permit parameters?
Has the facility submitted its annual compliance report to users and DWQ?
(If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified operator
on each shift?
Is the ORC visitation log available and current?
Is the ORC certified at grade equal to or higher than the facility classification?
Is the backup operator certified at one grade less or greater than the facility classification?
Is a copy of the current NPDES permit available on site?
Facility has copy of previous year's Annual Report on file for review?
Comment: The February 2019 DMR was reviewed for accuracy with no discrepancies found.
Effluent Sampling
Is composite sampling flow proportional?
Yes No NA NE
III ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
0
0
0
0
0
■ ❑ ❑ ❑
❑ ❑ U ❑
O OUD
❑ ❑•❑
O 0110
❑ ❑•❑
• ❑ ❑ ❑
❑ ❑•❑
Yes No NA NE
❑ ❑ • ❑
Page# 3

Permit: NC0041530
Inspection Date: 08/15/2019
Owner - Facility: Ocracoke Reverse Osmosis WTP
Inspection Type: Compliance Evaluation
Effluent Sampling
Is sample collected below all treatment units?
Is proper volume collected?
Is the tubing clean?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type
representative)?
Comment: Compliance samples are grab as stated in the NPDES permit.
The facility is field parameter certified (#5614) for PH and DO.
Effluent Pipe
Is right of way to the outfall properly maintained?
Are the receiving water free of foam other than trace amounts and other debris?
If effluent (diffuser pipes are required) are they operating properly'?
Comment: No adverse conditions were observed from the shore.
During the inspection the water plant was not in operation.
Yes No NA NE
MOOD
▪ ❑ ❑ ❑
❑ ❑•❑
• ❑ ❑ ❑
• ❑ ❑ ❑
Yes No NA NE
III000
• ❑ ❑ ❑
❑ ❑ ❑•
Page# 4

Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
Stream Class
7Q10s (cfs)
7Q1Ow (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
Data Source(s)
Table 1. Project Information
E CHECK IF HQW OR ORW WQS
Ocracoke Reverse Osmosis WTP
NC0041530
Mary Ann's Pond (Pamlico Sound)
SA;HQW
Tidal, IWC = 100%
Tidal, IWC = 100%
Tidal, IWC = 100%
Tidal, IWC = 100%
Tidal, IWC = 100%
BIMS Data Jun2017 to Jun2020
Saltwater streams are tidal resulting in all IWC % = 100%.
If an approved model is conducted then a chronic dilution
factor is determined and can be applied to a discharge to
calculate its IWC % . If a stream is classified as a SA or
ORW then its is also classified as a HQW. The appropriate
IWC % must be defined to properly calculate WQS-based
limits.
Saltwater RPA 95% Probablitv/95% Confidence
MAXIMUM DATA POINTS = 58
' REQUIRED DATA ENTRY
Table 2. Parameters of Concern
Name
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
WQS
Type Chronic Modifier Acute PQL Units
NOTE: The aquatic life chronic and acute WQS for several metals are calculated based on EPA conversi
see "Diss. SW stds. As TM" for more details and summary of calculated WQS..
NC0041530 RPA 2020,input
7/21/2020

REASONABLE POTENTIAL ANALYSIS - DATA
Par07
Copper
Date Data BDL=1/2DL Results
1 8/9/2017 < 10 5 Std Dev.
2 11/7/2017 < 10 5 Mean
3 2/6/2018 < 10 5 C.V.
4 5/8/2018 < 10 5 n
5 8/7/2018 < 10 5
6 11/6/2018 < 10 5 Mult Factor = 1.0000
7 2/5/2019 < 10 5 Max. Value 5.00 ug/L
8 5/7/2019 < 10 5 Max. Pred Cw 0 DETECTS ug/L
9 8/6/2019 < 10 5
10 11/5/2019 < 10 5
11 2/4/2020 < 10 5
12 5/5/2020 < 10 5
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL.
Values" then "COPY"
. Maximum data
points = 58
0.0000
5.0000
0.0000
12
NC0041530 RPA 2020,data
Date}

Ocracoke Reverse Osmosis WTP
NC0041530 Saltwater RPA 95%
MAXIMUM
Qw (MGD) = 0.18
1Q10S (cfs) = Tidal, IWC = 100%
7Q1OS (cfs) = Tidal, IWC = 100%
7Q1OW (cfs) = Tidal, IWC = 100%
30Q2 (cfs) = Tidal, IWC = 100%
Avg. Stream Flow, QA (cfs) = Tidal, IWC = 100%
Receiving Stream: Mary Ann's Pond (Pamlico Sound)
Probablity/95% Confidence
DATA POINTS = 58
WWTP/WTP Class: PC-1
IWC% @ 1Q10S = 100
IWC% @ 7Q1OS = 100
IWC% @ 7Q1OW = 100
IWC% @ 30Q2 = 100
IWC% @ QA = 100
Stream Class: SA;HQW
Outfall 001
Qw = 0.183770967741935 MGD
YOU HAVE DESIGNATED THIS RECEIVING
STREAM AS HQW OR ORW.
PARAMETER
TYPE
(1)
NC STANDARDS OR EPA CRITERIA
PQL
UNITS
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
Chronic
Applied
Standard
Acute
ri
# Det. Max Pred Cw Allowable Cw
Copper
NC
1.85
SW(7Q10s)
2.9
2.0
ug/L
12
0
NO DETECTS
Acute: 2.90
_ _ _ _ _ _ _ _ _ _ _ _maintain
Chronic: 1.85
Max MDL = 10
No detects - MDL (PQL) > Allowable Cw,
quarterly monitoring _ _ _ _ _
No detects - MDL (PQL) > Allowable Cw,
maintain quarterly monitoring
Page 3 of 4
NC0041530 RPA 2020,rpa
7/21/2020

Saltwater - Total Recoverable Metal Standards for Aquatic Life Protection
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC Environmental Management Commission (EMC) on November 13, 2014. The US
EPA subsequently approved the WQS revisions on April 6, 2016, with some exceptions.
Table 1. NC 2007-2015 Triennial Review Dissolved Metals Water Quality Standards converted to Total Recoverable Metals For Aquatic Life Protection
1
Parameter
Acute SW, ug/1
(Dissolved)
Chronic SW, ug/1
(Dissolved)
EPA Conversion FactorsZfor
Dissolved Metals
Acute SW, ug/1
Chronic SW, ug/1
Saltwater CMC
(Acute)
Saltwater CCC
(chronic)
(Total Metal)
(Total Metal)
Arsenic
69
36
1
1
69
36
Cadmium
40
8.8
0.994
0.994
40.2
8.9
Chromium VI
1100
50
0.993
0.993
1107.8
50.4
Copper
4.8
3.1
0.83
0.83
5.8
3.7
Lead
210
8.1
0.951
0.951
220.8
8.5
Nickel
74
8.2
0.99
0.99
74.7
8.3
Silver
1.9
0.1
0.85
—
2.2
Zinc
90
81
0.946
0.946
95.1
85.6
Table 1 Notes:
1. SW= Saltwater
2. EPA Conversion Factors from US EPA website, National Recommended Water Quality Criteria - Aquatic Life Criteria Table;
https://www. epa. gov/wqc/national-recom mended-water-quality-criteria-aquatic-life-criteria-table#a
The dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to obtain a Total Recoverable Metal at ambient conditions. This method presumes that the metal is
dissolved to the same extent as it was during EPA's criteria development for metals.

Permit No.
NPDES Implementation of Instream Dissolved Metals Standards — Saltwater Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April6, 2016, with some exceptions. Therefore, metals limits in draft
permits out to public notice after April 6, 2016 must be calculated to protect the new standards - as
approved.
Table 1. NC Dissolved Metals Water Quality Standards/Aquatic Life Protection
Parameter
Acute FW, µg/1
(Dissolved)
Chronic FW, 1.ig/1
(Dissolved)
Acute SW, 1.ig/1
(Dissolved)
Chronic SW, 1.1g/1
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns (as are all human health standards for all metals). It is still necessary
to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC
2B.0200 (e.g., arsenic at 10 µg/1 for human health protection; cyanide at 5 µg/L and fluoride at
1.8 mg/L for aquatic life protection).
General Information on the Reasonable Potential Analysis (RPA)
The RPA process itself did not change as the result of the new metals standards. However, application of
the dissolved metal standards requires additional consideration in order to establish the numeric standard
for each metal of concern of each individual discharge. Note that none of the saltwater standards are
hardness -dependent.
Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR 122.45(c). The
discharge -specific standards must be converted to the equivalent total values for use in the RPA
calculations. We will generally rely on conversion factors determined by EPA (more on that below), but it
is also possible to consider case -specific translators developed in accordance with established
methodology.
RPA Permitting Guidance — Discharges to Saltwater (Tidal waters)
The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern,
based on recent effluent data, and calculate the allowable effluent concentrations, based on applicable
standards and the stream dilution. For discharges to saltwater, no allowance for dilution is given unless a
dilution study, such as a CORMIX model, is performed.
If the maximum predicted value is greater than the maximum allowed value (chronic or acute), the
discharge has reasonable potential to exceed the standard, which warrants a permit limit in most cases. If
monitoring for a particular pollutant indicates that the pollutant is not present (i.e. consistently below
detection level), then the Division may remove the monitoring requirement in the reissued permit.
Page 1 of 3

Permit No.
1. To perform a RPA using the saltwater dissolved metal standards, the Permit Writer compiles the
following information:
• Permitted flow
• Receiving stream classification
• Instream Wastewater Concentration, if a dilution model has been performed
2. The RPA spreadsheet converts the dissolved numeric standard (SW standards listed in Table 1.)
for each metal of concern to a total recoverable metal, using the EPA conversion factors
published in the June, 1996 EPA Translator Guidance Document. This method presumes that the
metal is dissolved to the same extent as it was during EPA's criteria development for metals.
Conversion Factors for Dissolved Metals
Metal
Saltwater CMC
(Acute)
Saltwater CCC
(chronic)
Arsenic 1.000
Cadmium 0.994
Chromium VI 0.993
Copper 0.83
Lead 0.951
Mercury 0.85
Nickel 0.990
Selenium 0.998
Silver 0.85
Zinc 0.946
1.000
0.994
0.993
0.83
0.951
0.85
0.990
0.998
—
0.946
From: US EPA website, National Recommended Water Quality
Criteria - Aquatic Life Criteria Table
https://www.epa.gov/wgc/national-recommended-water-
quality-criteria-aquatic-life-criteria-table#a
3. The dissolved numeric standard for each metal of concern is divided by the EPA conversion
factor (or site -specific translator) to obtain a Total Recoverable Metal at ambient conditions.
4. If a dilution study was performed on the receiving stream and an Instream Wastewater
Concentration (IWC) determined the RPA spreadsheet uses a mass balance equation to determine
the total allowable concentration (permit limits) for each pollutant using the following equation:
Ca = (s7Q10 + Qw) (Cwqs) — (s7Q10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L)
Cb = background concentration: assume zero for all toxicants except NH3* (µg/L or mg/L)
Qw = permitted effluent flow (cfs, match 7Q10 units)
s7Q10 = summer, critical low flow (cfs)
* Discussions are on -going with EPA on how best to address background concentrations
Assuming no background concentration, this equation can be reduced to:
Ca = (s7Q10 + Qw) (Cwqs) or Ca = Cwqs
Qw
IWC
Page 2 of 3

Permit No.
Where: IWC = Qw
Qw + s7Q10
or 1
D
and D = modelled dilution factor (unitless)
If no dilution study has been performed Ca, the allowable effluent concentration, is equal to the
Total Recoverable Metal determined at ambient conditions (ie. the dissolved numeric standard
divided by the EPA conversion factor (or site -specific translator) for the metal of concern). See
item # 3 above.
5. The permit writer enters the most recent 2-3 years of effluent data for each pollutant of concern.
Data entered must have been taken within four and one-half years prior to the date of the permit
application (40 CFR 122.21). The RPA spreadsheet estimates the 95th percentile upper
concentration of each pollutant. The Predicted Max concentrations are compared to the Total
allowable concentrations to determine if a permit limit is necessary. If the predicted max exceeds
the acute or chronic Total allowable concentrations, the discharge is considered to show
reasonable potential to violate the water quality standard, and a permit limit (Total allowable
concentration) is included in the permit in accordance with the U.S. EPA Technical Support
Document for Water Quality -Based Toxics Control published in 1991.
6. When appropriate, permit writers develop facility specific compliance schedules in accordance
with the EPA Headquarters Memo dated May 10, 2007 from James Hanlon to Alexis Strauss on
40 CFR 122.47 Compliance Schedule Requirements.
7. The Total Chromium NC WQS was removed and replaced with a hexavalent chromium standard.
As a cost savings measure, total chromium data results may be used as a conservative surrogate in
cases where there are no analytical results based on chromium VI. In these cases, the projected
maximum concentration (95th %) for total chromium will be compared against the water quality
standard chromium VI.
Page 3of3

September 2020
Local news
`Keeper of the light' crosses th
By Rita Thiel
0 cracoke Island
may not have
had a human
lighthouse keeper in
recent years, but it has
indeed had its "Keeper
of the Light."
Thurston, the gray
and white Ocracat, had
staked out the board-
walk and grounds of
Ocracoke's lighthouse
for the last several
years and seeing Thur-
ston was a reason visi-
tors kept returning to
see a lighthouse they'd
seen a half a dozen
times already.
"We used to go to the
lighthouse just to see
Thurston," said one of
many Facebook post-
ers.
Ocracoke lost its fe-
line Keeper on Aug. 11.
Thurston had unfortu-
nately been in declining
health and was under the care
of Dr. Laura Trent.
Considered a "feral," or
"community," cat, he eagerly
greeted anyone who walked
Thurston the Ocracat staked out the Ocracoke
Lighthouse.
"his" territory and unabash-
edly solicited pets, hugs and
snuggles.
Over the years, both Ocracats
and residents made sure Thur-
ston had fresh food and water
each day, often chatting
with lighthouse visitors
about him.
When Ocracats post-
ed news of his departure
across the "rainbow
bridge," it was met with
an instant outpouring
lamenting the passing
of a great ambassador
and one of the island's
attractions.
The Ocracats' Face -
book page post has
drawn almost 80,000
hits and hundreds of
comments, and this
is only one of several
internet sites that has
posted news of Thur-
ston's passing.
A common theme
was how and where to
honor Thurston with a
memorial. Ocracats set
up a fundraiser page
that has raised nearly
$2,800.
All funds donated for Thur-
ston will go toward a memorial.
Ocracats is more than willing
to do something in Thurston's
honor somewhere, and that lo-
PUBLIC NOTICE
North Carolina Environmental Management Commission/NPDES Unit
1617Mail Service Center . Raleigh, NC 27699-1617
NOTICE OF INTENT TO ISSUE A NPDES WASTEWATER PERMIT
NC0041530 OCRACOKE SANITARY DISTRICT
The North Carolina Environmental Management Commission proposes to issue a NPDES
wastewater discharge permit to the person(s) listed below. Written comments regarding the pro-
posed permit will be accepted until 30 days after the publish date of this notice (Sept. 1, 2020).
The Director of the NC Division of Water Resources (DWR) may hold a public hearing should
there be a significant degree of public interest. Please mail comments and/or information re-
quests to DWR at the above address. Interested persons may visit the DWR at 512 N. Salisbury
Street, Raleigh, NC to review information on file.
Additional information on NPDES permits and this notice may be found on our website: http://
deq. nc. gov/about/divisions/water- resources/water-resources-permits/wastewater-branch/np-
des-wastewater/public-notices,or by calling [phone].
Ocracoke Sanitary District applied to renew NPDES permit for their RO WTP [NC0041530),
159 Water Plant Road, Hyde County, discharging treated wastewater to Mary Ann's Pond (Pam-
lico Sound), Tar -Pamlico River Basin.
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(25

RE: Peer Review - NC0041530 Ocracoke Sanitary District - Ocracoke Reverse Osmosis
WTP
Phillips, Emily <[e-mail]>
Fri 8/7/2020 1 ,6 AM
To: Denard, Derek <[e-mail]>
Looks good, except you have "Director" twice on page 1, down at the signature line for Danny.
I updated the public access system.
Have an awesome weekend! Stay safe, and take care.
E
From: Denard, Derek <[e-mail]>
Sent: Wednesday, August 5, 2020 2:46 AM
To: Phillips, Emily <[e-mail]>
Subject: Peer Review - NC0041530 Ocracoke Sanitary District - Ocracoke Reverse Osmosis WTP
Emily,
Attached is a share link to the subject peer review. Files to review are in the "peer review" sub -folder.
Please update Access.
ENC0041530 Ocracoke Sanitary District - Ocracoke Reverse Osmosis WTP
Thanks a bunch. Hope you are doing well.
Derek
Derek Denard
Environmental Specialist
N.C. Division of Water Resources
N.C. Department of Environmental Quality
919 707 3618 office
919 707 9000 main DWR
[e-mail]
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

2/2/2021 Mail - Denard, Derek - Outlook
Re: [External] Re: Draft NPDES Permit NC0041530 - Ocracoke Reverse Osmosis WTP
Denard, Derek <[e-mail]>
Wed 8/19/2020 10:39 PM
To: David Tolson <[e-mail]>
David,
Thanks for the comments. I will get back with you with an answer to your requests for the final.
Thanks,
Derek Denard
Environmental Specialist
N.C. Division of Water Resources
N.C. Department of Environmental Quality
919 707 3618 office
919 707 9000 main DWR
[e-mail]
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: David Tolson <[e-mail]>
Sent: Thursday, August 13, 2020 10:19 AM
To: Denard, Derek <[e-mail]>
Subject: [External] Re: Draft NPDES Permit NC0041530 - Ocracoke Reverse Osmosis WTP
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment
to report.spammnc.gov
Mr. Denard
We received and opened and printed the attached for our review and records.
Electronic transmittal from you is fine, just keep in mind that we are a small system and we do not have a scanner to
get documents into the computer on our end, so anything
you may need from us that is not in our computer or if forms have to be printed and signed we cannot get them back
into our computer to send them back to you.
We note that you have Turbidity to be tested twice a month, as was in our draft the last time our permit was renewed,
but it was reduced to once per month.
We have a limit of 25 NTU for Turbidity, but since October 2017, the highest result we have had is 6.7. We tested
years ago for this and that was the reason
for years they removed this from our permit.
https://outlook.office365.com/mail/AAMkADdhYTVmZDBILTESZDctNG15MC04Zj1iLWU4MjVhZTBhMmJkMgAuAAAAAADg3GZR8iZnTYW56121 cjmNA... 1/3

2/2/2021 Mail - Denard, Derek - Outlook
Being on an Island accessible only by ferry can make getting water test off Island to the Lab in the time required very
challenging because wind, tide, fog and
mechanical failure of ferries and can affect ferry schedule and make it very difficult to get UPS to pickup and get back
to Manteo in time to meet the trucks to go out on time.
We request that you make Turbidity testing either quarterly like the rest of our effluent (except for flow, pH and DO) or
at least leave it monthly as it is now.
We use Zinc orthophosphate for corrosion control since RO water is very soft and can cause corrosion in customers
lines and plumbing and it is like the chorine, it is added only to the potable water, it does not go thru the RO units so it
never comes into contact with the effluent/discharge. After the water goes into the RO units, effluent goes out thru
one pipe and potable water goes out thru another towards the tanks and that is where the zinc and chlorine are
added.
Thank you for your consideration in this matter.
If you have any questions, please contact this office.
David Tolson
Ocracoke Sanitary District --Manager
159 Water Plant Rd.
PO Box 567
Ocracoke, NC 27960
252-928-5791--office
252-928-6651--Plant& Fax
[e-mail]
On Thursday, August 13, 2020, 01:12:20 AM EDT, Denard, Derek <[e-mail]> wrote:
Mr. Tolson,
Please find the attached draft NPDES Permit NC0041530 for Ocracoke Reverse Osmosis WTP.
In order to provide more convenience, control, and security to our permittees and assist them in
processing their transactions, The Division of Water Resources is currently transitioning towards
electronic correspondence. This will hopefully provide more efficient service to our permittees and
other partners and will allow us to more effectively process and track documents. We are writing to ask
you for your approval of the transmittal of documents related to your permitting and related activities
with the Division in an electronic format. Documents will be emailed to the appropriate contact
person(s) in your organization in a PDF format.
Please respond to me through email with verification that transmittal of your documents in an
electronic manner is acceptable to you.
Please respond to this email confirming that you received the attached document(s), were able to open
and view the document(s) and have saved/printed a copy for your records.
If you have questions concerning the draft, please contact me at 919-707-3618, or via e-mail at
[e-mail].
Sincerely,
Derek Denard
https://outlook.office365.com/mail/AAMkADdhYTVmZDBILTESZDctNG15MC04Zj1iLWU4MjVhZTBhMmJkMgAuAAAAAADg3GZR8iZnTYW56121 cjmNA... 2/3

2/2/2021 Mail - Denard, Derek - Outlook
Environmental Specialist
N.C. Division of Water Resources
N.C. Department of Environmental Quality
919 707 3618 office
919 707 9000 main DWR
[e-mail]
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
https://outlook.office365.com/mail/AAMkADdhYTVmZDBILTESZDctNG15MC04Zj1iLWU4MjVhZTBhMmJkMgAuAAAAAADg3GZR8iZnTYW56121 cjmNA... 3/3

2/2/2021 Mail - Denard, Derek - Outlook
[External] Re: Issuance of NPDES Permit NC0041530 - Ocracoke Reverse Osmosis WTP
David Tolson <[e-mail]>
Tue 1/19/2021 8:50 AM
To: Denard, Derek <[e-mail]>
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment
to Report Spam.
Mr. Denard:
Transmittal of documents in electronic format is fine. We received printed and saved our new permit with no issues.
Thank you for granting our request of taking Turbidity monthly rather than twice a month.
Janie M. Garrish
Office Manager
David Tolson
Ocracoke Sanitary District --Manager
159 Water Plant Rd.
PO Box 567
Ocracoke, NC 27960
252-928-5791--office
252-928-6651--Plant& Fax
[e-mail]
On Tuesday, January 19, 2021, 08:00:24 AM EST, Denard, Derek <[e-mail]> wrote:
Mr. Tolson,
Please find the attached issuance for NPDES Permit NC0041530 for Ocracoke Reverse Osmosis WTP.
In order to provide more convenience, control, and security to our permittees and assist them in
processing their transactions, The Division of Water Resources is currently transitioning towards
electronic correspondence. This will hopefully provide more efficient service to our permittees and
other partners and will allow us to more effectively process and track documents. We are writing to ask
you for your approval of the transmittal of documents related to your permitting and related activities
with the Division in an electronic format. Documents will be emailed to the appropriate contact
person(s) in your organization in a PDF format.
Please respond to this email confirming that you received the attached document(s), were able to open
and view the document(s) and have saved/printed a copy for your records.
If you have questions concerning the draft, please contact me at 919-707-3618, or via e-mail at
[e-mail].
Sincerely,
https://outlook.office365.com/mail/AAMkADdhYTVmZDBILTESZDctNG15MC04Zj1iLWU4MjVhZTBhMmJkMgAuAAAAAADg3GZR8iZnTYW56121 cjmNA... 1/2

2/2/2021 Mail - Denard, Derek - Outlook
Derek Denard
Environmental Specialist
N.C. Division of Water Resources
N.C. Department of Environmental Quality
919 707 3618 office
919 707 9000 main DWR
[e-mail]
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
https://outlook.office365.com/mail/AAMkADdhYTVmZDBILTESZDctNG15MC04Zj1iLWU4MjVhZTBhMmJkMgAuAAAAAADg3GZR8iZnTYW56121 cjmNA... 2/2