NC0083909_Permit Issuance_20030731

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, PE, Director
July 31, 2003
Mr. Billy Brown
Dare County
600 Mustian Street
Rill Devil Hills, North Carolina 27948
1I
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Issuance of NPDES Permit NCO083909
Rodanthe, Waves. Salvo R.O. WTP
Dare County
Dear Mr. Brown:
Division of Water Quality (Division) personnel have reviewed and approved your application for
renewal of the subject permit. Accordingly, we are forwarding the attached NPDES discharge permit.
This permit is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and
the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection
Agency dated May 9, 1994 (or as subsequently amended).
In consideration of your comments, the following changes have been made:
• The limit for cyanide has been eliminated and the monitoring has been reduced to
quarterly. In reviewing the data, all samples were below detection level, elimitiating the
need for a limit.
• The limit for chromium has been eliminated and the monitoring has been reduced to
quarterly. Incorrect criteria were applied during the reasonable potential analysis. The
new analysis does not indicate reasonable potential to exceed water quality criteria.
• The footnote and monitoring requirement for total residual chlorine has been eliminated in
consideration of the fact that Dare County does not chlorinate above the reverse osmosis
unit.
• In consideration of the physical constraints for upstream sampling, that point has been
moved to 27 feet north of the outfall pipe. Should you wish to suggest an east -west
configuration for instream sampling, please do so.
The selenium limit and monitoring must remain in the permit as a daily maximum. This is per
a stipulation from EPA Region Iv, which reviews and approves all of North Carolina's NPDES permits.
Implementation of monthly average limits will be considered once Dare County has completed dilution
modeling for the Rodanthe, Waves. Salvo R.O. WTP discharge. It is very strongly recommended that
you perform this modeling, as the Division is considering requiring it of all tidal WTP discharges. If
you have any questions about the manner in which metals criteria are derived, please contact Connie
Brower at [phone] ext. 572.
In addition, the water treatment plant report that you requested is enclosed along with your
new permit. It contains updated permitting strategies for discharges from membrane and ion
exchange water treatment facilities.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition.
conforming to Chapter 150B of -the North Carolina General Statutes, and filed with the Office of
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer VISIT US ON THE INTERNET @ http:Hh2o.encstate.nc.usINPDES

Administrative Hearings (6714 Mail Service Center. Raleigh, North Carolina 27699-6714). Unless
such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect the
legal requirements to obtain other permits which may be required by the Division of Water Quality or
permits required by the Division of Land Resources, the Coastal Area Management Act or any other
Federal or Local governmental permit that may be required.
If you have any questions concerning this permit, please contact Natalie Sierra at telephone
number [phone], extension 551.
Sincerely,
ORIGINAL SIGNED BY
SUSAN A. WILSON
Alan W. HIimek, PE
cc: Central Files
Washington Regional Office/Water Quality Section
NPDES Unit
Technical Assistance & Certification Unit
Aquatic Toxicology Unit
Division of Marine Fisheries
US Fish and Wildlife Service
Division of Coastal Management
DEH, Shellfish Sanitation
Connie Brower, DWQ Planning Branch
Bob Oreskovitch. Dare County
Ed Lawler - Hobbs. Upchurch & Associates. P.A.
2522 S. Croatan Highway, Suite 2A
Nags Head, North Carolina 27959

.-
Permit NCO083909
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PP PMTT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
Dare County
is hereby authorized to discharge wastewater from a facility located at the
Rodanthe, Waves, Salvo Reverse Osmosis Water Treatment Plant
Off NCSR 12
Rodanthe
Dare County
to receiving waters designated as Blackmar Gut in the Pasquotank River Basin
in accordance with effluent limitations, monitoring requirements, and other
conditions set forth in Parts I, II, III and IV hereof.
This permit shall become effective September 1, 2003.
This permit and authorization to discharge shall expire at midnight on December 31, 2007.
Signed this day July 31, 2003.
ORIGINAL SIGNED BY
SUSAN X "LSON
Alan W. Klimek, PE. Director
Division of Water Quality
By Authority of the Environmental Management Commission

a
Permit NCO083909
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge, are hereby
revoked. [The exclusive authority to operate this facility arises under this permit. The authority
to operate the facility under previously issued permits bearing this number is no longer effective.]
The conditions, requirements, terms and provisions of this permit authorizing discharge under
the NPDES govern discharges from this facility.
Dare County is hereby authorized to:
1. Continue to discharge concentrate reject water from a reverse osmosis plant
located at Rodanthe, Waves, Salvo Reverse Osmosis Water Treatment Plant, off
NCSR 12, Rodanthe in Dare County.
2. Discharge from said reverse osmosis treatment plant at the location specified on
the attached map into Blackmar Gut, which is classified SA-HQW waters in the
Pasquotank River Basin.

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NCO083909 - Rodanthe, Waves, Salvo R.O. WTP
Latitude: 35"35*43" Sub -Basin: 03-01-55
Longitude: 75"28* 12-
Quad #- E36SE/Rodanthc. NC
Stream Class: SA-HQW
Receiving Stream: Blackmar Gut
Permitted Flow: 0.3 MGD .I(,Ip In't to sca(e
.1%
Facility x
Location
Dore Comity Regional Water System
Rodanthe. Waves. Salvo R.O. WTP
T o =rth NCO083909

Permit NCO083909
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — FINAL
During the period beginning on the effective date of this permit and lasting until expiration. the Permittee is
authorized to discharge from outfaU 001. Such discharges shall be limited and monitored by the Permittee as
specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample Location'
Flow
0.3 MGD
Continuous
Recording
Effluent
Total Suspended Solids
30.0 m L
45.0 m /L
Quarterly
Grab
Effluent
Total Dissolved Solids
Monthly
Grab
Effluent
pH2
Monthly
Grab
Effluent, Upstream,
Downstream'
Temperature
Monthly
Grab
Effluent, Upstream,
Downstream'
Salinity
Monthly
Grab
Effluent, Upstream,
Downstream'
Dissolved Oxygen
Monthly
Grab
Effluent, Upstream,
Downstream'
Conductivity
Monthly
Grab
Effluent, Upstream,
Downstream'
Chloride
Monthly
Grab
Effluent
Ammonia Nitrogen
Monthly
Grab
Effluent
Total Nitrogen
Monthly
Grab
Effluent
Total Phosphorus
Monthly
Grab
Effluent
Total Copper
Monthly
Grab
Effluent
Total Zinc
Monthly
Grab
Effluent
Total Selenium
36 L
2/Month
Grab
Effluent
Total Cyanide
Quarterly
Grab
Effluent
Total Arsenic
Quarterly
Grab
Effluent
Total Cadmium
Quarterly
Grab
Effluent
Total Chromium
Quarterly
Grab
Effluent
Total Fluoride
Quarterly
Grab
Effluent
Total Iron
Quarterly
Grab
Effluent
Total Lead
Quarterly
Grab
Effluent
Total Mercury
Quarterly
Grab
Effluent
Total Nickel
Quarterly
Grab
Effluent
Total Silver
Quarterly
Grab
Effluent
Acute ToXiCity3
Quarterly
Composite
Effluent
Footnotes:
1. Upstream = 27 feet north of the outfall, Downstream = 50 feet south of the outfall.
2. The pH shall not be less than 6.8 standard units nor greater than 8.5 standard units.
3. Acute Tosicit.' (J ysidopsis Gabia) P/F: January, April, July and October (see A. (2)).
There shall be no discharge of floating solids or visible foam in other than trace amounts

Permit NCO083909
A. (2.) ACUTE TOXICITY PERMIT LINUT (QUARTERLY)
The Permittee shall conduct acute toxicity tests on a auarterty basis using protocols defined in the
North Carolina Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity
In A Single Effluent Concentration" (Revised -July, 1992 or subsequent versions). The monitoring
shall be performed as a Mysidopsis bahia 24 hour static test. The effluent concentration defined as
treatment two in the procedure document will be 90%. Effluent samples for self -monitoring purposes
must be obtained during representative effluent discharge below all waste treatment. The tests will
be performed during the months of January, April, July and October.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter
code TGE3E. Additionally, DWQ Form AT-2 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Water Quality
1621 Mail Service Center
Raleigh, N.C. 27699-1621
Test data shall be complete and accurate and include all supporting chemical/physical
measurements performed in association with the toxicity tests, as well as all dose/response data.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine
is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT)
test form indicating the facility name, permit number, pipe number, county, and the month/year of
the report with the notation of "No Flow" in the comment area of the form. The report shall be
submitted to the Environmental Sciences Branch at the address cited above.
Should the Permittee fail to monitor during a month in which toxicity monitoring is required, then
monthly monitoring will begin immediately until such time that a valid test is submitted. Upon
submission of a valid test, this monthly test requirement will revert to quarterly in the months
specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re-
opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival and appropriate environmental controls, shall constitute an invalid test
and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.

Re: Permit.Revim - Dare County Rodanthe, Waves, Salvo WTP
s.
Subject: Re: Permit Review - Dare County Rodanthe, Waves, Salvo WTP
Date: Fri, 25 Jul 2003 15:41:42 -0400
From: Patti Fowler <[e-mail]>
To: Natalie Sierra <[e-mail]>
Natalie,
We would have no comment on this permit renewal. The proposed discharge is located
in closed
shellfishing waters. If I can be of further assistance please inform.
Patti
Natalie Sierra wrote:
> Patti-
> The map is attached.
> -Natalie
> Patti Fowler wrote:
> > Natalie,
> > Everything looks fine with me but I would like to have a site location map of the
discharge
> > location. I will also need to pass this by J.D. Potts who heads up our
recreational water
> > quality program. He will be on vacation next week so if you can get me a map by
tomorrow
> > that would be great. Our Fax # is 252-726-8475.
> > Thanks.
> > Patti
> > Natalie Sierra wrote:
> > > Patti-
> > > Thanks for reviewing this one. Since no one over there has seen it yet,
> > > I didn't really know what to attach. I've attached the draft permit and
> > > cover letter (along with the fact sheet) as well as the final permit
> > > and issuance letter (ignore the date - I need your approval before
> > > issuance). Let me know if you have any questions.
> > > Thanks,
> > > Natalie
> > > ------------------------------------------------------------------------
> > > Name: NC0083909 Fact Sheet.doc
> > > NC0083909 Fact Sheet.doc Type: Microsoft Word Document
(application /msword )
> > > Encoding: base64
> > > Download Status: Not downloaded with message
> > > Name: NC0083909_draft . doc
> > > NC0083909 draft.doc Type: Microsoft Word Document
(application/msword)
> > > Encoding: base64
> > > Download Status: Not downloaded with message
> > > Name: NC0083909_draftcovlet.doc
> > > NC0083909 draftcovlet.doc Type: Microsoft Word Document
(application/msword)
> > > Encoding: base64
> > > Download Status: Not downloaded with message
> > > Name: issuance cover.doc
> > > issuance cover.doc Type: Microsoft Word Document
1 of 2 7/28/03 11:16 AM

Mill Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
10 2522 S. Croatan Highway • Suite 2A • P.O. Drawer 1929 • Nags Head, North Carolina 27959
May 21, 2003
Ms. Natalie Sierra
NCDENR-DWQ-
1617 Mail Service Center
Raleigh, NC 27699-1617 a J U N- 2 2003
i
RE: NPDES Draft Permit #NC0083909
RWS RO WTP
Dare County
HUA#DR0202
Dear Ms. Siena,
On May 20, 2003 I met with staff members of the Dare County Water Department to
discuss the DRAFT permit for the Rodanthe, Waves, Salvo RO WTP. In that meeting the
following issues were raised:
• Dare County has not received a copy of the RO effluent study cited in recent
correspondence with DWQ. We made our initial request for a copy in our letter
dated January 21, 2003.
• The RWS RO does not use chlorine in any phase of the raw or concentrate f
stream. Therefore we request that total residual chlorine level of 17ug/I not be �,r
written into the monitoring requirements. (for clarity)
• The effluent limits established for the metals Chromium, Cyanide, & Selenium
are below or right at the low limit detection levels of laboratories in North 'j
Carolina. For example, our laboratory services vendor has a low limit detection
level of 10 ug/l for Chromium with a + or —10% accuracy. The turn around time
`fir' 'ia1" ` for analytical results :s yt' 35-40 days at best. Therefore we would like to request
that the limits for metals be assigned to a monthly average.
• Dare County would like you to clarify why the limits for metals are established
below what current laboratory technology (in North Carolina) can detect with
reasonable accuracy and expediency.
• Given physical constraints of the discharge location we feel that the requirement
for upstream and downstream sites specified as being 50 feet away are not
achievable. This requirement needs to be redefined. Please see attached maps.
Also attached is a summary of metals analysis from the RWS system. Please note that the
levels detected are at or near the low limit of available technology. We feel that the
margin of error weighs disproportionately against Dare County.
Nags Head, NC • Telephone [phone] • Fax [phone] • e-mail: [e-mail]
Southern Pines • Myrtle Beach 9 Raleigh • Charlotte

Thank you for your consideration in this matter. Please understand that we are not trying
to get out of monitoring, but the ramifications of a violation for a public entity can exceed
the monetary penalty. Therefore, we request that limits established be analytically
attainable with a reasonable confidence level.
If you have any questions, or need further information please let me know.
Sincerely,
Hobbs, Upchurch & Associates, P.A.
Ed Lawler
Project Manager
CC: Bob Oreskovich, Utilities Director
Dare County Water
Billy Brown, ORC
RWS R.O. WTP

NOTES:
1) Distance from Discharge pipe North to inlet
share = 27 fe et.
2) Distance from Discharge pipe South to inlet
shore = 92 feet.
r
Discharge
LEGEND
^/rc:: utclapa th.
_
1-11 n ekcl..,
� '.IkICtl M3
El
YRSJA Pv-TERS
w.
t;
RWS Water
Treatment Facility
DARE COUNTY WATER. DISCHARGE PIPE
GIS RODANTHE, NC
MATTHEW HIBLER 70 0 70 140 Feet
ZV MAY 22. 2003 Tll�� I +

RODANTHE, WAVES, SALVO RIO WTP
METALS
ANALYSIS SUMMARY
NPDES Detects
Cyanide
Selenium
Chromium RWS PLANT
DATE:
Feb. 2001
0
0
0
Mar. 2001
0
0
8ppb
Apr. 2001
0
0
0
May-01
0
0
0
Jun-01
0
0
6ppb
Jul-01
0
0
0
Aug-01
0
0
0
Sept. 2001
0
0
0
Oct. 2001
0
0
0
Nov. 2001
0
0
0
Dec. 2001
0
0
7ppb
Jan. 2002
0
0
0
Feb. 2002
0
0
0
Mar. 2002
0
0
0
Apr. 2002
0
0
0
May-02
0
0
0
Jun. 2002
0
0
0
Jul. 2002
0
13ppb
0
Aug. 2002
0
0
0
Sept. 2002
0
0
0
Oct. 2002
0
0
0
Nov. 2002
0
0
0
Dec. 2002
0
0
0
Jan. 2003
0
0
0
Feb.2003
0
15ppb
0
Mar.2003
0
18ppb
0
Apr.2003
0
13ppb
0

Draft perrng reviews (7)
f
Subject: Draft permit reviews (7)
Date: Fri, 30 May 2003 10:59:05 -0400
From: John Giorgino <[e-mail]>
To: Natalie Sierra <Natalie.Sierra@ncmaiLnet>
Hi Natalie,
Boy, you have been busy! A quick note to let you know that I have
reviewed the following draft permits:
NCO026433 Town of hillsborough WWTP
NCO064050 Middle Creek WWTP
NCO083909 Rodanthe, Waves, Salvo WTP
NCO021547 Town of Franklin WWTP
NCO026824 John Umstead Hospital WWTP
NCO029033 Neuse River WWTP (Wake)
NC0003379 Neuse River WWTP (Person)
I have no comments concerning the tox section.
-John
1 of 1 7/21/03 2:10 PM

PUBLIC NOTICE
STATE OF NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT
COMMISSION/NPDES UNIT
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
NOTIFICATION OF INTENT TO ISSUE
A NPDES WASTEWATER PERMIT
On the basis of thorough staff review and
application of NC General Statute 143.21.
Public law 92-500 and other lawful stan.
dards and regulations, the North Carolina
Environmental Management Commission
proposes to issue a National Pollutant Dis-
charge Elimination System (NPDES) waste-
water discharge permit to the person(s)
listed below effective 45 days from the pub-
lish date of this notice.
Written comments regarding the proposed
permit will be accepted until 30 days after
the publish date of this notice. All comments
received prior to that date are considered in
the final determinations regarding the pro-
posed permit. The Director of the NC Divi-
sion of Water Quality may decide to hold a
public meeting for the proposed permit
should the Division receive a significant
degree of public interest.
Copies of the draft permit and other sup-
porting information on file used to determine
conditions present in the draft permit are
available upon request and payment of the
costs of reproduction. Mail comments
and/or requests for information to the NC
Division of Water Quality atthe above
address or call Ms. Valerie Stephens at
[phone]. extension 520. Please
include the NPDES permit number
(attached) in any communication. Interested
persons may also visit the Division of Water
Quality at 512 N. Salisbury Street, Raleigh,
NC 27604-1148 between the hours of 8:00
a.m. and 5:00 p.m. to review information on
file.
NCO083909 Dare County — Rodanihe,
Waves, Salvo R.O. Water Treatment Plant
has applied for a renewal of its ,permit dis-
charging to the Blackmer Gut in the Pas-
quotank River Basin. Total chromium, Iota]
cyanide and total selenium are water, rty
limited. This dischaMe may affect future -
allocations to the receiving stream::. - - =:-
pv 2 7 20a3
NORTH Cl�ROL A
DARE CO NTY. 0t.. ',
OF PUBLICATION
Before the undersigned, a Notary Public of said County
and State, duly commissioned, qualified, and authorized
by law to administer oaths, personally appeared
Susan..M,.. Simps.on,..treasurer ........
............................................... who being
first duly sworn, deposes and says: that he (she) is of The
Times Printing Co., Inc., engaged in the publication of a
newspaper known as THE COASTLAND TIMES, pub-
lished, issued, and entered as second class mail in the Town
of Marten, in said County and State; that he is authorized to
make this affidavit and sworn statement; that the notice or
other legal advertisement, a true copy of which is attached
hereto, was published in THE COASTLAND TIMES on the
following dates:
May ..1.1.,..20.03...................................
........................................................:
and that the said newspaper in which said notice, paper,
document, or legal advertisement was published was, at
the time of each and every such publication, a newspaper
meeting all of the requirements and qualifications of Sec-
tions 1-596 and 1-597 of the General Statutes of North Caro-
lina and was a qualified newspaper within the meaning of
Section 1-597 of the General Statutes of North Carolina.
a®
i.
Sworn to and subscribed to tA.
me,dayof .... .2003.........!!` A
Notary Public ,qq�
My Commission expires:.. Y` i ..I Z v Z©V S

DENR/DWQ
FACT SKEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NCO083909
Facility Information
Applicant/Facility Name:
Dare Count /Rodanthe,Waves,Salvo R.O. WTP
Applicant Address:
P.O. Box 500; Rodanthe, North Carolina 27968
Facility Address:
Off NCSR 12; Rodanthe, North Carolina 27968
Permitted Flow
0.3 MGD
Type of Waste:
100% reject water (from reverse osmosisplant)
Facility/Permit Status:
Class I/Active; Renewal
County:
I Dare Count
Miscellaneous
Receiving Stream:
Blackmar Gut
Regional Office:
Washington
Stream Classification:
SA-HQW
State Grid / USGS Quad:
E36SE
303(d) Listed?
no
Permit Writer:
Natalie V. Sierra
Subbasin:
03-01-55
Date:
4/9/03
Drainage Area (mi'"):
NA
Lat. 35035' 43" N Long. 75° 28' 12" W
Summer 7Q10 (cfs)
NA (tidal)
Winter 7Q10 (cfs):
NA (tidal)
30Q2 (cfs)
NA (tidal)
Average Flow (cfs):
NA (tidal)
WC (%):
TIDAL
BACKGROUND
Dare County's Rodanthe, Waves, Salvo Reverse Osmosis Water Treatment Plant is a Class I
Physical/Chemical plant with a permitted flow of 0.3 MGD. The plant discharges reject water
from a reverse osmosis water treatment plant serving the communities of Rodanthe, Waves and
Salvo, all on Hatteras Island. The WTP produces 1.0 MGD of potable water by treating
groundwater from two wells on the Yorktown Aquifer.
The only chemicals added during the water treatment process (and thus expected to be in the
reject water) are a scale inhibitor and sulfuric acid. From concentration of the source water, the
discharge contains detectable levels of barium, boron, calcium, iron, magnesium, potassium,
sodium, tin, ammonia nitrogen, bromide, chloride, sulfate and fluoride.
The permit was last issued on December 22, 2000 and expired March 31, 2003. The Permittee
applied for renewal of the NPDES permit by submitting Standard Form C-RO on October 7,
2002.
Instream Monitoring and Verification of Existing Conditions and DMR Data Review
This facility discharges to Blackman Gut (classified SA-HQW), located within sub -basin 03-01-
55 of the Pasquotank River Basin. In the May 2002 Pasquotank Basinwide Water Quality Plan,
most of the waters in this subbasin were rated as fully supporting their designated uses.
Blackman Gut is considered a primary shellfishing (for market purposes) area with water quality
higher than North Carolina's standards for such waters (High Quality Waters (HQW)).
The facility is not required to monitor instream water quality, so no instream data were reviewed.
Effluent data from February 2001 (the first full effective month of the permit) through February
2003 were compiled from Discharge Monitoring Reports (DMRs) for conventional parameters,
metals and toxicants. Flow, conductivity, salinity, total suspended solids (TSS), settleable solids
and turbidity values are presented in Table 1 below. The remaining monitored parameters were
analyzed using a reasonable potential analysis. This analysis is presented in a later section of this
fact sheet.
Fact Sheet
NPDES NCO083909 Renewal
Page 1

Table 1 Summaryof effluent DMR data NC=not calculated, because most of the values were below detection level.
It is difficult to assess the conductivity and salinity values with no knowledge of the instream
values. TSS, settleable solids and turbidity were extremely low and most of the data points were
below detection level. Flow was well within the permit limit of 0.3 MGD.
Correspondence
The Washington Regional Office (WaRO) conducted one site visit to this facility in February
2001. The facility received a compliant rating at that time. The Aquatic Toxicology Unit (ATU)
conducted a toxicity test in March 2002 that resulted in an LC50 of 76.8%, which is less than the
90% acute limit in most permits.
Waste Load Allocation (WLA)
The permit was last issued in December 2000. The permit contains limits for flow, TSS,
settleable solids, pH, turbidity, arsenic, cadmium, cyanide, lead, mercury, nickel, and selenium.
Due to the tidal nature of the receiving waterbody, no Instream Waste Concentration (IWC) can
be established for this discharge without proper modeling. Limits for toxicants were therefore
implemented as acute limits at I/2 the water quality standard (since Blackmar Gut is classified
HQW). The facility is also required to monitor for conductivity, chloride, chromium, copper,
salinity, silver, zinc, fluoride, iron, and acute toxicity.
Reasonable Potential Analysis (RPA)
The Division conducted EPA -recommended analyses to determine the reasonable potential for
toxicants to be discharged by this facility, based on DMR data from February 2001 through
February 2003. Calculations included: arsenic, cadmium, chloride, chromium, copper, cyanide,
lead, mercury, nickel, selenium, silver, zinc, fluoride and iron.
Results suggest no reasonable potential for the facility to discharge arsenic, cadmium, chloride,
fluoride, iron, lead, mercury, silver and nickel. These parameters will be monitored on a
quarterly basis.
Chromium, copper, cyanide, selenium and zinc all showed reasonable potential to exceed water
quality standards. Copper and zinc will be monitored but not limited, as they are action level
parameters. As per North Carolina's current action level policy, copper and zinc should only be
limited if a facility shows recurrent toxicity problems that can be linked to copper and zinc.
Chromium, cyanide and selenium will all be limited at the standard. Monitoring for copper and
zinc will be monthly, while monitoring for chromium, cyanide and selenium will be twice per
month.
Water Treatment Plant Permitting Strategy
As per the findings of the interagency Water Treatment Plant Workgroup (as summarized in
Assessment and Recommendations for Water Treatment Plant Permitting), the following will
also be incorporated into the draft permit:
. Temperature and dissolved oxygen monitoring - monthly
Fact Sheet
NPDFS NCOO93909 Reuc"ai
Page 2

• Elimination of settleable solids and turbidity monitoring (scarcely detected during
entire permit period). The intent of these monitoring requirements will now be met
with monthly total dissolved solids monitoring.
• Ammonia nitrogen, total nitrogen and total phosphorus monitoring — monthly
• Instream monitoring for pH, dissolved oxygen, salinity, conductivity, and
temperature- monthly
• Total residual chlorine limit — with footnote indicating that this limit is only
required if chlorine or a chlorine derivative is used in the treatment process
Other Changes
It is recommended that the total suspended solids monitoring be reduced to quarterly given that it
was so rarely detected in the past two years. Moreover, this type of discharge is more likely to
include high levels of dissolved solids, not suspended solids. At the next renewal, the permit
writer may wish to consider elimination of the total suspended solids monitoring requirement.
SUMMARY OF PROPOSED CHANGES
In keeping with Division policies and the updated policy for permitting reverse osmosis water
treatment plants, the following will be incorporated into the permit:
• Addition of monthly temperature and dissolved oxygen monitoring
• Elimination of settleable solids and turbidity monitoring
• Addition of monthly total dissolved solids monitoring.
• Addition of monthly ammonia nitrogen, total nitrogen and total phosphorus
monitoring
• Addition of monthly instream monitoring for pH, dissolved oxygen, salinity,
conductivity, and temperature
• Addition of total residual chlorine limit (with footnote)
• Removal of limits for arsenic, cadmium, mercury, lead, and nickel (with
monitoring reduced to quarterly).
• Reduction of monitoring frequency for silver, fluoride and iron from monthly to
quarterly.
• Addition of limit for chromium, monitoring frequency increased to twice
monthly.
• Increase of monitoring frequency for cyanide and selenium to twice monthly.
• Reduction of TSS monitoring to quarterly.
New Weekly Average and Daily Maximum limits are derived from the latest NC/EPA policies
considering'/2 FAVs and allowable concentrations based on reasonable potential.
Requirements for flow, effluent pH, chloride, copper, zinc, salinity and toxicity will remain the same.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
April 23, 2003
June 16, 2003
Attachments: Conventional effluent data summary, toxicant effluent data summary, reasonable potential
analysis, toxicity report, relevant pages of WTP permitting recommendations report.
Fact Sheet
NPDES NCO083909 Rcnoval
Page 3

NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit, please contact
Natalie Sierra at 2
19) 733-5083 eext. 55 .6)/4 2) �/ /�
NAME: • DATE: 7 —� % ! 3
REGIONAL OFFICE COMMENTS
SUPERVISOR: DATE:
Fact Sheet
NPDES NCO083909 Rcne%"l
Page 4

Date
Flow
(MGD)
Conductivity
(umhos)
Salinity
(%)
TSS
(mg/L)
Settleable
Solids
(ml/L)
Turbidity
(NTU)
Feb-01
0.021
8730
3.87
1
<0.1
1.6
Mar-01
0.041
7180
2.85
<1
<0.1
1.9
Apr-Ot
0.052
5560
2.83
<1
<0.1
2
May-01
0.066
8750
3.64
<1
<0.1
<1.0
Jun-01
0.108
8290
3.68
<1
<0.1
1.1
Jul-01
0.132
8300
3.3
<1
<0.1
1.6
Aug-01
0.127
8580
3.48
<1
<0.1
2.8
Sep-01
0.076
9750
3.62
<1
<0.1
<1.0
Oct-01
0.06
8720
3.35
<1
<0.1
1.5
Nov-01
0.045
9120
3.62
<1
<0.1
1.2
Dec-01
0.028
9730
3.62
1
<0.1
<1.0
Jan-02
0.02
7900
2.81
<1
<0.1
1.3
Feb-02
0.02
9120
3.42
<1
<0.1
<1.0
Mar-02
0.035
9470
3.71
<1
<0.1
2.2
Apr-02
0.058
8040
2.92
<1
<0.1
4.7
May-02
0.076
8480
3.12
<1
<0.1
4.7
Jun-02
0.126
9110
3.02
<1
<0.1
<1.0
Jul-02
0.15
8690
3.35
<t
<0.1
<1.0
Aug-02
0.141
8970
3.17
<1
<0.1
<1.0
Sep-02
0.116
8200
4.34
<1
<0.1
<1.0
Oct-02
0.061
5710
2.89
<1
0.1
<1.0
Nov-02
0.047
5500
2.9
<1
<0.1
<1.0
Dec-02
0.035
8230
2.97
<1
<0.1
<1.0
Jan-03
0.042
6700
2.77
<1
<0.1
<1.0
Feb-03
1 0.033
8580
3.55
<1
<U.1
<1.0
Average
0.069
8216
3.31
NC
NC
NC
Max
0.150
1
9750
4.34
1.0
0.1
4.7
Min
0.020
5500
2.77
<t
<0.1
<1
NC = not calculated, because most of the values were below detection level

Date
Arsenic
(ug/L)
Cadmium
(ug/LO
Chloride
(mg/L)
Chromium
(ug/L)
Copper
(ug/L)
Cyanide
(ug/L)
Lead
(ug/L)
Mercury
(ug/L)
Nickel
ug/L)
Selenium
(ug/L)
Silver
(ug/L)
Zinc
(ug/L)
Fluoride
(mg/L)
Iron
(mg/L)
Feb-01
<5
<2
2130
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
7
0.15
Mar-01
<5
<2
1560
8
80
<5
<3
<0.2
<5
<5
<2
7
6.77
0.08
Apr-01
<5
<2
1550
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
7.11
0.085
May-01
<5
<2
2000
<5
8
<5
<3
<0.2
<5
<5
<2
<5
7.07
0.135
Jun-01
<5
<2
1910
<5
<3
<5
<3
<0.2
<5
<5
<2
0.17
6.69
0.115
Jul-01
<5
<2
1810
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
7.25
0.105
Aug-01
<5
<2
2130
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
7
0.15
Sep-01
<5
<2
1990
<5
0.021
<5
<3
<0.2
<5
<5
<2
<5
6.88
0.135
Oct-01
6
<2
1840
<5
<3
<5
<3
<0.2
<5
<5
<2
7
6.94
0.11
Nov-01
<5
<2
1990
<5
30
<5
<3
<0.2
<5
<5
<2
<5
7.2
0.16
Dec-01
<5
<2
1990
7
13
<5
<3
<0.2
<5
<5
<2
46
6.61
0.125
Jan-02
<5
<2
1540
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
7.53
0.06
Feb-02
<5
<2
1880
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
6.16
0.145
Mar-02
<5
<2
2040
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
6.79
0.15
Apr-02
<5
<2
1600
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
7.05
0.09
May-02
<5
<2
1710
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
0.98
0.1
Jun-02
<5
<2
1810
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
6.35
0.1
Jul-02
<5
<2
1760
<5
18
<5
<3
<0.2
<5
13
<2
<5
6.08
0.07
Aug-02
<5
<2
1750
<5
11
<5
<3
<0.2
<5
<5
<2
<5
6.65
0.11
Sep-02
<5
<2
1750
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
6.58
0.11
Oct-02
<5
<2
1850
<5
<3
<5
<3
<0.2
<5
8
<2
<5
6.4
0.06
Nov-02
<5
<2
1800
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
6.12
0.089
Dec-02
<5
<2
1950
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
7.18
0.098
Jan-03
<5
<2
1960
<5
<3
<5
<3
<0.2
<5
<5
<2
<5
6.62
0.096
Feb-03
<5
<2
1950
<5
<3
<5
<3
<0.2
<5
15
<2
<5
5.88
0.18

roalby Nanne =
Dare Co. R\VS KO. \VTP
QW fMGD)=
0.3
WWTP Classification
I
NPDES # =
NC0083909
Receiving Stream
Rlacknmr Gut
1WC(%)=
100.01)
emonxble, Potenfial Suntom
rhd R. d,,
L T' 3° 4°
Strewn Classification SA I HOW
7Q10s(rfs)=
30Q2 (cfs)
Qavg (cfs)
Arsenic
jImplemenlaliou
Mu. Pled Cw
8.6 µgA
'Are all mponed values less than?
No
Liout?
No
Monitoring
Allowable Cw
25.0 µgA
'Is the detection limit acceptable'!
Yes
Monitor?
Yes
-Frequency Quarterly
Cadmium
Implementation
Most. Pred Cw
1.0 µgA
!Are all reposed values less than?
Yes
Linut?
No
!Monitoring
Allowable Ce,
25 82
I)s the detection linut acceptable?
Yes
Monitor?
Yes
!Frequency Quarterly
12 PAVI
42142A
I
[
$1114ri{Ie::aa::::'.:i>::::i:::::
llmPlementalion
I
Max. Psed Cw
2414.5 mg/L
jAmallrepnnedvalues less than'!
No
Limit?
No
jMonitofing
Allowable Cw
no standard mgfL
;Is the detection limit acceptable?
Yes
Monitor!
Yes
:Frequency Monthly
Corundum
9mplennentaliov
i
Max. Pred Cw
14.9 µgA
Are all reposed values less Dun?
No
Linut?
Yes
Monitoring
Allowable Cw
10.0 µgA
!Is the detection limit acceptable?
Yes
Monte"
Yes
!Frequency 2/Month
C41Q?et f::'y`iiiii'!<::.
,lasplementation
Max. Pred Cw
489.1 µgA
!Areall neponedvalues less Nan?
No
Limit?
NO
!Monitoring
Allowable Cw
IS
Its the detection limit acceptable?
Yes
Monitor'!
Yes
(Frequency Monthly
12 FAVI
µgA
I
I
Cyanide t
!implementation
[
Max. Pred Cw
2.5 µgA
jAre all reported values less Dun!
Yes
Lintit?
Yes
Monitoring
Allowable Cw
21
'Is the detectimf tittdtaccepmblc?
Yes
Monitor!
Yes
Frequency 2/Month
12 FAV
1.0 pg/I
Flouride
Implententrtlov
!Are
No
Wonitofing
Max. Pled Cw
Allowable Cw
9.7 pgA
Net aPOC µgA
all mponed values less than?
I Is One, detection limit accetable?
No
Yes
Linut?
.Monitor?
Yes
!Frequency Quarterly
Implementation
Mast Ppmd Cw
0.3 µgA
I Are all reported values less than?
No
Lintt?
No
[MO!toting
Allowable Cw
Not a POC µgA
le de dctacdon limit acceptable?
Yes
meniwrl
Yes
Frequency Quarterly
I.ad
iImplementation
I
Max. Pred Cw
1.5 µgA
iAre all screened values less man?
Yes
Limit?
No
iMOnitoring
Allowable Cw
125
'IS Ne demaion limit acceptable?
Yes
Monitor!
Yes
Frequency Quarterly
12 FAV
2I0.0 µ
Mercury
Implementation
Max. Pred Cw
0.1000 µgA
Are all reported values less matt?
Yes
Limit'!
No
Wonitoring
Allowable Cw
0.0125 µgA
Its de defecueu limit aecepublc?
Yes
Meaner!
Yes
]Frequency Quarterly
Nickel
[Implementation
I
Max. Pled Cw
2.5 µgA
!Are all mponed values less than'(
Yes
Lintit?
No
(Monitoring
Allowable Cw
4.2 go
CIS the detection limit acceptable?
Yes
Monitor?
Yes
jFrequency Quarterly
12 FAVI
5.0 µ
Sil3 ur _..
:'::::::::::: ii
'Imple nenta0on
j
Max. Pred Cw
2.0 pgA
Are all mponed values less thasi?
Yes
Limit!
No
Monitoring
Allowable Cw
0.1 AgA
!Isthedeuxaionkuutacceptable?
Yes
Monitor?
Yes
!Frequency Quarterly
112FAVI
I.9 µgA
!
Sclenims
Implementation
Mux. Pred Cw
43.3 µgA
Are all reported values less than?
No
Lintit'
Yes
I MOM1O ing
Allowable Cw
35.5 µgA
is du detection limit acceptable?
Yes
Moniwr!
Yes
jFr Uency 2/Month
Zinc
llmple nentofion
Max. Pmd Cw
253.0 µgA
i Are all reposed values less Hatt?
No
Limit?
No
jMonitoring
Allowable Cw
43.0
'Is the detection limit acceptable?
Yes
MoniwR
Yes
j Frequency Monthly
12FAV
95.0 µ,A

I
Facility Name =
Dare Co. RWS R.O. WTP
NPDES # =
NC0083909
Qw (MGD) =
0.3
7QIOs (cfs)=
1 0
IWC (%) =
100.00
FINAL RESULTS
Silver
Max. Pred Cw
2.00
Allowable Cw
0.05
ESULTS
d Dev. 0.0000
can 2.0
V. 0.0000
of data points 25
Mull Factor =
1.00
Max. Value
2.00 µg/l
Max. Pred Cw
2.00 µg/1
Allowable Cw
0.05 µg11
Parameter = Silver
Standard = 0.05 1 µg/l
n
<
Actual Data
BDL=1/2DL
1
<
2
1.0
2
<
2
1.0
3
<
2
1.0
4
<
2
1.0
5
<
2
1.0
6
<
2
1.0
7
<
2
1.0
8
<
2
1.0
9
<
2
1.0
10
<
2
1.0
11
<
2
1.0
12
<
2
1.0
13
<
2
1.0
14
<
2
1.0
15
<
2
1.0
16
<
2
1.0
17
<
2
1.0
18
<
2
1.0
19
<
2
1.0
20
<
2
1.0
21
<
2
1.0
22
<
2
1.0
23
<
2
1.0
24
<
2
1.0
25
<
2
1.0

f
Facility Name =
Dare Co. RWS R.O. WTP
NPDES # =
NC0083909
Qw (MGD) =
0.3
7QJos (cjs)=
0
IWC (%) =
100.00
FINAL RESULTS
Arsenic
Max. Pred Cw
8.561715302
Allowable Cw
25.0
RESULTS
Std Dev.
0.7000
Mean
2.6
C.V.
0.2652
Number
of data points
25
MuIt Factor
Max. Value
6.0 µg/1
Max. Pred Cw
8.561715302 µg/l
Allowable Cw
25.0 µg/l
Parameter = Arsenic
Standard = 25.0 1 µg/l
n
<
Actual Data
BDL=1/2DL
1
<
5
2.5
2
<
5
2.5
3
<
5
2.5
4
<
5
2.5
5
<
5
2.5
6
<
5
2.5
7
<
5
2.5
8
<
5
2.5
9
6
6.0
10
<
5
2.5
11
<
5
2.5
12
<
5
2.5
13
<
5
2.5
14
<
5
2.5
15
<
5
2.5
16
<
5
2.5
17
<
5
2.5
18
<
5
2.5
19
<
5
2.5
20
<
5
2.5
21
<
5
2.5
22
<
5
2.5
23
<
5
2.5
24
<
5
2.5
25
<
5
2.5

Facility Name =
Dare Co. RWS R.O. WTP
NPDES # =
NC0083909
Qw (MGD) =
0.3
7QIOs (cfs)=
0
[WC (%) =
100.00
FINAL RESULTS
Cadmium
Max. Pred Cw
1.0
Allowable Cw
2.5
RESULTS
Std Dev. 0.0000
Mean 1.0
C.V. 0.0000
Number
of data points 25
Mull Factor =
1.00
Max. Value
1.0 µgll
Max. Pred Cw
1.0 µg/l
Allowable Cw
2.5 µg/t
Parameter = Cadmium
Standard = 2.5 µgll
n < Actual Data BDL=1/2DL
1
<
2
1.0
2
<
2
1.0
3
<
2
1.0
4
<
2
1.0
5
<
2
1.0
6
<
2
1.0
7
<
2
1.0
8
<
2
1.0
9
<
2
1.0
10
<
2
1.0
11
<
2
1.0
12
<
2
1.0
13
<
2
1.0
14
<
2
1.0
15
<
2
1.0
16
<
2
1.0
17
<
2
1.0
18
<
2
1.0
19
<
2
1.0
20
<
2
1.0
21
<
2
1.0
22
<
2
1.0
23
<
2
1.0
24
<
2
1.0
25
<
2
1.0

Facility Name = Dare Co. RWS R.O. WTP
NPDES # = NC0083909
Qw (MGD) = 0.3
7Q10s (cfs)= 0
IWC (%) = 1 100.00
FINAL RESULTS
Chloride
Max. Pred Cw 2414.5
Allowable Cw no standard
Allowable Nday 0.00
ESULTS
:d Dev. 170.4162
lean 1850.0
N. 0.0921
data points 25
ult Factor = 1.13
lax. Value 2130.0 mg/L
fax. Pred Cw 2414.5 mg/L
Ilowable Cw no standard
Parameter = Chloride
Standard = no standard
Date n <
Actual Data
BDL=1/2DL
1
2130
2130.0
2
1560
1560.0
3
1550
1550.0
4
2000
2000.0
5
1910
1910.0
6
1810
1810.0
7
2130
2130.0
8
1990
1990.0
9
1840
1840.0
10
1990
1990.0
11
1990
1990.0
12
1540
1540.0
13
1880
1880.0
14
2040
2040.0
15
1600
1600.0
16
1710
1710.0
17
1810
1810.0
18
1760
1760.0
19
1750
1750.0
20
1750
1750.0
21
1850
1850.0
22
1800
1800.0
23
1950
1950.0
24
1960
1960.0
25
1950
1950.0

Facility Name = Dare Co. RWS R.O. WTP
NPDES # = NC0083909
Qw (MGD) = 0.3
7Q10s (cfs)= 0
IWC (0/0) = 100.00
FINAL RESULTS
Cyanide
Max. Pred Cw 2.5
Allowable Cw 0.5
RESULTS
Std Dev. 0.0000
Mean 2.5
C.V. 0.0000
Number
of data points 25
Mull Factor =
1.00
Max. Value
2.5 µg/1
Max. Pred Cw
2.5 µg/l
Allowable Cw
0.5 µg/1
Parameter = Cyanide
Standard = 0.5 i µg/1
n
<
Actual Data
BDL=1/2DL
1
<
5
2.5
2
<
5
2.5
3
<
5
2.5
4
<
5
2.5
5
<
5
2.5
6
<
5
2.5
7
<
5
2.5
8
<
5
2.5
9
<
5
2.5
10
<
5
2.5
11
<
5
2.5
12
<
5
2.5
13
<
5
2.5
14
<
5
2.5
15
<
5
2.5
16
<
5
2.5
17
<
5
2.5
18
<
5
2.5
19
<
5
2.5
20
<
5
2.5
21
<
5
2.5
22
<
5
2.5
23
<
5
2.5
24
<
5
2.5
25
<
5
2.5

Facility Name = Dare Co. RWS R.O. WTP
NPDES # =
NC0083909
Qw (MGD) =
0.3
7Q]Os (cfs)=
0
IWC
100.00
FINAL RESULTS
Copper
Max. Pred Cw
488.1
Allowable Cw
1.5
ESULTS
d Dev. 16.5738
can 7.6
V. 2.1911
data points 25
Mull Factor =
=6.10
Max. Value
80.0
µg/l
Max. Pred Cw
488.1
µg/1
Allowable Cw
1.5
µg/1
Parameter = Copper
Standard = 1.5 d µg/l
n
<
Actual Data
BDL=1/2DL
1
<
3
1.5
2
80
80.0
3
<
3
1.5
4
8
8.0
5
<
3
1.5
6
<
3
1.5
7
<
3
1.5
8
2.1
2.1
9
<
3
1.5
10
30
30.0
11
13
13.0
12
<
3
1.5
13
<
3
1.5
14
<
3
1.5
15
<
3
1.5
16
<
3
1.5
17
<
3
1.5
18
18
18.0
19
11
11.0
20
<
3
1.5
21
<
3
1.5
22
<
3
1.5
23
<
3
1.5
24
<
3
1.5
25
<
3
1.5

Facility Name = Dare Co. RWS R.O. WTP
NPDES # = NC0083909
Qw (MGD) = 0.3
7QIQs (cfs)= 0
IWC (%) = 100.00
FINAL RESULTS
Chromium
Max. Pred Cw 14.9
Allowable Cw 10.0
RESULTS
Std Dev. 1.3919
Mean 2.9
C.V. 0.4800
Number
of data points 25
Mult Factor
Max. Value
8.0 µg/1
Max. Pred Cw
14.9 µgll
Allowable Cw
10.0 µg/l
Parameter = Chromium
Standard = 10.0 µgll
n < Actual Data BDL=1/2DL
1
<
5
2.5
2
8
8.0
3
<
5
2.5
4
<
5
2.5
5
<
5
2.5
6
<
5
2.5
7
<
5
2.5
8
<
5
2.5
9
<
5
2.5
10
<
5
2.5
11
7
7.0
12
<
5
2.5
13
<
5
2.5
14
<
5
2.5
15
<
5
2.5
16
<
5
2.5
17
<
5
2.5
18
<
5
2.5
19
<
5
2.5
20
<
5
2.5
21
<
5
2.5
22
<
5
2.5
23
<
5
2.5
24
<
5
2.5
25
<
5
2.5

Facility Name = Dare Co. RWS R.O. WTP
NPDES # = NC0083909
Qw (MGD) = 0.3
7QIOs (cfs)= 0
IWC (%) = 100.00
FINAL RESULTS
Flouride
Max. Pred Cw 9.7
Allowable Cw Not a POC
ESULTS
d Dev. 1.2244
can 6.5
V. 0.1879
of data points 25
Mutt Factor = 1.29
Max. Value 7.5 µg/I
Max. Pred Cw 9.7 µgll
Allowable Cw Not a POC µg/1
Parameter = Flouride
Standard = no standard d µg/1
n < Actual Data BDL=1/2DL
1
7
7.0
2
6.77
6.8
3
7.11
7.1
4
7.07
7.1
5
6.69
6.7
6
7.25
7.3
7
7
7.0
8
6.88
6.9
9
6.94
6.9
10
7.2
7.2
11
6.61
6.6
12
7.53
7.5
13
6.16
6.2
14
6.79
6.8
15
7.05
7.1
16
0.98
1.0
17
6.35
6.4
18
6.08
6.1
19
6.65
6.7
20
6.58
6.6
21
6.4
6.4
22
6.12
6.1
23
7.18
7.2
24
6.62
6.6
25
5.88
5.9

Facility Name = Dare Co. RWS R.O. WTP
NPDES # = NCO083909
Qw (MGD) = 0.3
7Q10s (cfs)= 0
1WC (/o) = 100.00
FINAL RESULTS
Iron
Max. Pred Cw 0.3
Allowable Cw Not a POC
RESULTS
Std Dev. 0.0318
Mean 0.1
C.V. 0.2834
of data points 25
Mult Factor = 1.5
Max. Value 0.2 µg11
Max. Pred Cw 0.3 µ9/1
Allowable Cw Not a POC µg/l
Parameter = Iron
Standard = no standard mg/L
n < Actual Data BDL=1/2DL
1 0.15
0.2
2 0.08
0.1
3 0.085
0.1
4 0.135
0.1
5 0.115
0.1
6 0.105
0.1
7 0.15
0.2
8 0.135
0.1
9 0.11
0.1
10 0.16
0.2
11 0.125
0.1
12 0.06
0.1
13 0.145
0.1
14 0.15
0.2
15 0.09
0.1
16 0.1
0.1
17 0.1
0.1
18 0.07
0.1
19 0.11
0.1
20 0.11
0.1
21 0.06
0.1
22 0.089
0.1
23 0.098
0.1
24 0.096
0.1
25 0.18
0.2

Facility Name = Dare Co. RWS R.O. WTP
NPDES # =
NCO083909
Qw (MGD) =
0.3
7QIOs (cfs)=
0
IWC (%) =
100.00
FINAL RESULTS
Mercury
Max. Pred Cw
0.100
Allowable Cw
0.013
RESULTS
Std Dev. 0.0000
Mean 0.100
C.v. 0.0000
(Number
of data points 25
Mult Factor =
1.000
Max. Value
0.100 µg/1
Max. Pred Cw
0.100 µg/I
Allowable Cw
0.013 µg/1
Parameter = Mercury
Standard = 0.013 µg/1
n
<
Actual Data
BDL=1/2DL
1
<
0.20
0.100
2
<
0.20
0.100
3
<
0.20
0.100
4
<
0.20
0.100
5
<
0.20
0.100
6
<
0.20
0.100
7
<
0.20
0.100
8
<
0.20
0.100
9
<
0.20
0.100
10
<
0.20
0.100
11
<
0.20
0.100
12
<
0.20
0.100
13
<
0.20
0.100
14
<
0.20
0.100
15
<
0.20
0.100
16
<
0.20
0.100
17
<
0.20
0.100
18
<
0.20
0.100
19
<
0.20
0.100
20
<
0.20
0.100
21
<
0.20
0.100
22
<
0.20
0.100
23
<
0.20
0.100
24
<
0.20
0.100
25
<
0.20
0.100

Facility Name =
Dare Co. RWS R.O. WTP
NPDES # =
NCO083909
Qw (MGD) =
0.3
7QIOs (cfs)=
0
IWC (%) =
100.00
FINAL RESULTS
Nickel
Max. Pred Cw
2.5
Allowable Cw
4.2
ESULTS
d Dev. 0.0000
can 2.5
V. 0.0000
of data points 25
ill Factor =
1.00
ax. Value
2.5 µgA
ix. Pred Cw
2.5 µg1I
lowable Cw
4.2 µg1I
Parameter = Nickel
Standard = 4.2 µgA
n < Actual Data BDL=1/2DL
1
<
5.0
2.5
2
<
5.0
2.5
3
<
5.0
2.5
4
<
5.0
2.5
5
<
5.0
2.5
6
<
5.0
2.5
7
<
5.0
2.5
8
<
5.0
2.5
9
<
5.0
2.5
10
<
5.0
2.5
11
<
5.0
2.5
12
<
5.0
2.5
13
<
5.0
2.5
14
<
5.0
2.5
15
<
5.0
2.5
16
<
5.0
2.5
17
<
5.0
2.5
18
<
5.0
2.5
19
<
5.0
2.5
20
<
5.0
2.5
21
<
5.0
2.5
22
<
5.0
2.5
23
<
5.0
2.5
24
<
5.0
2.5
25
<
5.0
2.5

Facility Name =
Dare Co. RWS R.O. WTP
NPDES # =
NC0083909
Qw (MGD) =
0.3
7Q10s (cfs)=
0
IWC (%) =
100.00
FINAL RESULTS
Lead
Max. Pred Cw
1.5
Allowable Cw
0.0
RESULTS
Std Dev.
0.0000
Mean
1.5
C.V.
0.0000
Number
of data points
25
Mult Factor =
1.00
Max. Value
1.5
µg/I
Max. Pred Cw
1.5
µgll
Allowable Cw
12.5
µgll
Parameter = Lead
Standard = 12.5 µgll
n
<
Actual Data
BDL=1/2DL
1
<
3
1.5
2
<
3
1.5
3
<
3
1.5
4
<
3
1.5
5
<
3
1.5
6
<
3
1.5
7
<
3
1.5
8
<
3
1.5
9
<
3
1.5
10
<
3
1.5
11
<
3
1.5
12
<
3
1.5
13
<
3
1.5
14
<
3
1.5
15
<
3
1.5
16
<
3
1.5
17
<
3
1.5
18
<
3
1.5
19
<
3
1.5
20
<
3
1.5
21
<
3
1.5
22
<
3
1.5
23
<
3
1.5
24
<
3
1.5
25
<
3
1.5

Facility Name =
Dare Co. RWS R.O. WTP
NPDES # =
NC0083909
Qw (MGD) =
0.3
7QIOs (cfs)=
0
IWC (%) =
100.00
FINAL RESULTS
Selenium
Max. Pred Cw
43.3
Allowable Cw
35.5
RESULTS
Std Dev. 3.3183
Mean 3.6
C.V. 0.9116
Number
of data points 25
Mult Factor =
2.89
Max. Value
15.0 µgll
Max. Pred Cw
43.3 µg/l
Allowable Cw
35.5 µg/1
Parameter = Selenium
Standard = 35.5 µ9/1
n < Actual Data BDL=1/2DL
1
<
5
2.5
2
<
5
2.5
3
<
5
2.5
4
<
5
2.5
5
<
5
2.5
6
<
5
2.5
7
<
5
2.5
8
<
5
2.5
9
<
5
2.5
10
<
5
2.5
11
<
5
2.5
12
<
5
2.5
13
<
5
2.5
14
<
5
2.5
15
<
5
2.5
16
<
5
2.5
17
<
5
2.5
18
13
13.0
19
<
5
2.5
20
<
5
2.5
21
8
8.0
22
<
5
2.5
23
<
5
2.5
24
<
5
2.5
25
15
15.0

Facility Name = Dare Co. RWS R.O. WTP
NPDES ## =
NCO083909
Qw (MGD) =
0.3
7QIOs (cfs)=
0
IWC (%) =
100.00
FINAL RESULTS
Zinc
Max. Pred Cw
253.0
Allowable Cw
43.0
Allowable Nday
0.0
RESULTS
Std Dev. 8.7500
Mean 4.5
C.V. 1.9415
Number
of data points
25
Mult Factor =
5.50
Max. Value
46.0 µg/I
Max. Pred Cw
253.0 µg/1
Allowable Cw
43.0 µg/I
Parameter = Zinc
Standard = 43.0 µgA
n
<
Actual Data
BDL=1/2DL
1
<
5
2.5
2
7
7.0
3
<
5
2.5
4
<
5
2.5
5
0.17
0.2
6
<
5
2.5
7
<
5
2.5
8
<
5
2.5
9
7
7.0
10
<
5
2.5
11
46
46.0
12
<
5
2.5
13
<
5
2.5
14
<
5
2.5
15
<
5
2.5
16
<
5
2.5
17
<
5
2.5
18
<
5
2.5
19
<
5
2.5
20
<
5
2.5
21
<
5
2.5
22
<
5
2.5
23
<
5
2.5
24
<
5
2.5
25
<
5
2.5

Whole Effluent Toxicity Testing Self -Monitoring Summary February 19, 2003
FACILITY REQUIREMENT
YEAR JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Robbins WWTP chrlim 100/.
1999 Pon
-
-
Pass
--
-
pass
-
-
pass
-
-
NC0062855/001 Begin:7/12002 Frequency: Q Jan Apr Jul Oct
+ NonComp: Single
2000 Pass
-»
Pass
-
-
Pass
--
-
Pass
-
--.
County. Moore Region: FRO Subbasin: CPFIO
2001 Pass
-
-
Pass
-
-
Pass
-
-
NR
Pass
-
PR 1.3 Special
2002 pass
-
--
pass
-
-
Pass
-
-
pass
-
-
7QI0: 15.9 IWC(-/.)10 Order:
2003 Pass
Robersonville WWTP chr lim: 90Y.
1999 -
pass
-
--
Pass
-
-
Pass.Fail
late
>100
pass
-
NC0026042/001 Begin:l/l2001 Frequency: Q Feb May Aug Nov
+ NonComp:Single
2000 -
Pass
--
--
Pass
-
-
Fail
>100
82.16
Pons
-
County: Martin Region: WARO Subbasin: TAR06
2001 -
Pass
-
-
Pass
-
-
Pass
-
-
Fail
>100
PF. 1.8 Special
2002 94.9
Fail
58.1
>100
2,100
-
-
Pass
-
-
Pass
-
7Q10: 0.27 IWC(-/.) 91.2 Order:
2003
Rockingham Power LLC 24hr LC50 ac flhd monit epis(grab)
1999 -
-
-
-
-
-
-
---
-
-
-
-
NC0086665/001 Begin:1/12000 Frequency: A
NonComp:
2000 --
-
-
I
--
-
I
-
-
I
'--
-
County: Rockingham Region: WSRO Subbasin: ROA03
2001 -
>100
--
>100
-
>100
-
>100
-
>100
-
>100
PF. NA Special
2002 >100
--
--
-
-
-
-
--
--
---
--
--
7QIo: 0 IWC(-/.)100 Order:
2003
Rockingham WWTP chr lim: 8•/.
1999 -
Pass
-
-
Pass
-
-
pass
-
-
Pass
-
NC0020427/001 Begin:6Jl/1999 Frequency: Q P/F + Feb May Aug Nov
+ NonComp: Single
2000 -
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
County: Richmond Region: FRO Subbasin: YAD16
2001 -
pass
-
--
Pass
-
-
Pass
-
-
Pass
-
PF: 9.0 Special
2002 ...
Pass
-
-
pass
-
-
pass
-
-
Pass
--
7Q10: 153 IWC(S/.) 8.0 Order.
2003
Rocky Mount/Tar River Regional WWTP chr lim: 35%
M 1999 Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
NC0030317/001 Bcgin:7/12000 Frequency: Q Jan Apr Jul Oct
+ NonComp:Single
2000 Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
County: Edgecombe Region: RRO Subbasin: TAR02
2001 Fail
79.4
>90
Pass
-
-
Pass
-
-
Pass
-
-
PF: 21 Spacial
2002 pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
7QI0: 60 IWC(-/.) 35 Order:
2003 Pass
Rodanthe/Waves/Salvo (RO) WTP-Dare 24hr ac p/f monit 90%mysid (grab)
1999 -~-
NC0083909/001 Begin;2/i/2001 Frequency: Q Jan Apr Jul Oct
NonComp:
2000 --
-
-
_
--
--
--
---
-
--
-
--
County: Dare Region: WARO Subbasin: PAS55
2001 --
-
---
Pass
-
-
Pass
-
-
Fail
Fail
Fall
PF: 0.3 Special
2002 Fail
Pass
Pass
Pass
-
-
Pass
---
Pass
NR
-
--
7QI0: IWC(%)100 Ord:
2003 Pass
Rose Hill WWTP chr lim: 90%
1999 Late
35
61
61
Late
35
35
Late
82
82
Pass,61
PassJrasst
NCO056863/001 Begin:9/t/1996 Frequency: Q P/F + Jan Apr Jul Oct
NonComp:Singlc
2000 52
94.86
82.2
>100
82.2
>100
94.87
>100
>100
-
-
05
County Duplin Region: WIRO Subbasin: CPF22
2001 >100
>100
>100
>100
2-100
>100
Pass
-
-
Pass
-
-
PF: OAS Special
2002 pass
-
-
Pass
-
-
Pass
-
-
Fail
>100
58.1
7QIo: 0.0 IWC(-�.)100 Order:
2003 Pass
Roseboro WWTP chr lim: 52%
1999 -
Pass
-
-
Pass
-
---
Pass
-
Pass
-
NC0026816/001 Begin:8/1/1996 Frequency: Q P/F + Feb May Aug Nov
NonComp:Single
2000 -
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
County: Sampson Region: FRO Subbasin: CPF19
2001 -
Pass
--
-
Pass
-
-
Pass
-
-
Pass
-
PF: 0.7 special
2002 -
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
7Q10:1.0 IWC(•/.)52 Order:
2003
Roxboro WWTP chr lim: 90%
V 1999 -
-
Pass
-
-
Pass
-
-
Late
Pass
-
pass
NCO021024/001 Begin: 1/32003 Frequency: Q Mar Jun Sep Doc
+ NonComp:Singlc
2000 -
-
Pass
-
-
Pass
-
-
Fall
>100
>100
Pass
County: Person Region: RRO Subbasin: ROA05
2001 -
-
Pass
--
-
Pass
-
-
Pass
-
-
Pass
PF: 5.0 Special
2002 --
-
Pass
--
-
Pass
--
-
Pass
>100
-
Late
7Q 10: 0.0 IWC(-/.)100 Order:
2003 Pass
Rutherfordton WWTP chr lim: 71%
1999 Pass
-
-»
Pass
-
-
NR/Pass
--
-
Pass
-
--
NC0025909/001 Begin:7/1/1999 Frequency: Q P/F + Jan Apr Jul Oct
+ NonComp:Single
2000 Pass
-
-
Fail
Late
35A
84.9,Late
at
-
pass
-
-
County: Rutherford Region: ARO Subbasin: BRD02
2001 Fall
<25
NR
Pass
-
-
Fail
<60
<60,<60
Pass
-
-
PF: 3.0 Special
2002 pass
-
-
Fail
92.2
>100
Fail
25.3
>100
Late
Pass
-
7Q10: 1.7 IWC(`/.) 71 order:
2003 Fall
S.S. Mobile Home Park chr lim: 90Y.
1999 -
Late
NR/Pass
-
Fail
NR/Fail
NR
Pass
-
-
Pass
-
NC0038300/001 Begin: l/l2002 Frequency: Q Feb May Aug Nov
+ NonComp: Single
2000 -
Fail
Fail
pass
Fail
pass
-
Late
pass
-
Pass
-
County: Chatham Region: RRO Subbasin: CPF09
2001 -
Pass
-
-
Pass
--
-
pass
-
-
Pass
--
PF: 0.01 special
2002 -
Pass
-
--
Pass
-
-
Fail
>100
Late
>100.pass
-
7Q10: 0.0 IWC(-/.)100 Order:
2003
V Pre 1999 Data Available
LEGEND:
PERM- Permit Requirement LET = Administrative Letter - Target Frequency = Monitoring frequency: Q- Quarterly; M- Monthly; BM- Bimonthly; SA- Semiannually; A- Annually; OWD- Only when discharging; D- Discontinued monitoring requirement
Begin - First month required 7QI0 = Receiving stream low flow criterion (errs) + = quarterly monitoring increases to monthly upon failure or NR Months that testing must occur - ex. Jan, Apr, Jul, Oct NonComp = Current Compliance Requirement
PF - Permitted flow (MGD) IWC/. = Instream waste concentration P/F = Pass/Fail test AC - Acute CHR = Chronic
Data Notation: f - Fathcad Minnow; - - Ccriodaphnin sp.; my - Mysid shrimp; ChV - Chronic value; P - Mortality of stated percentage at highest concentration; at - Performed by DWQ Aquatic Tax Unit; bt - Bad test
Reporting Notation: --- = Data not required; NR - Not reported Facility Activity Status: I - Inactive, N - Newly Issued(To construct); H - Active but not discharging; t-More data available for month in question; • = ORC signature needed
38

Table 4-1 - Parameters of Concern for Membrane Water Treatment
Plants
Conventional Parameters
Flow pH
Temperature Dissolved Oxygen
Salinity Total Dissolved Solids
Conductivity
Toxicants
Arsenic Iron
Copper Fluoride
Chloride Zinc
Nutrients
.Ammonia Nitrogen Total Phosphorus (TP)
Total Nitrogen CM
Whole Effluent Toxicity
Monitor only per Table 4-2
Instreasn Monitoring
pH Conductivity
Dissolved Oxygen Temperature
Salinity
• Dissolved Oxygen
Dissolved oxygen monitoring has been included because of the low
dissolved oxygen concentrations observed in the effluent from the
facilities evaluated. If the facility can demonstrate (over a two year
period) that the discharge is not significantly affecting temperature
and dissolved oxygen in the receiving stream, the facility may petition
the Division to reduce/eliminate either or both the temperature and
dissolved oxygen monitoring requirements.
13

Although variability may occur both between plants and within a
particular facility, the Workgroup felt that grab samples were adequate to
characterize the effluent. After reviewing existing data, the consistency
in the individual source water and treatment process over time suggests
that grab samples are appropriate.
Sample T jpe - Sodium Cycle Cationic Exchange Plants
Over the course of the regeneration cycle, the effluent characteristics can
experience significant variability. Composite samples should be collected
for all parameters except flow, total residual chlorine, temperature, and
pH. These parameters can only be measured properly using grab
samples. An exception to the composite sampling requirement is
provided by 15A NCAC 213.0505 (C), which states that facilities with
design flows under 30,000 gallons per day may use grab samples to
characterize their effluent.
Monitoring Frequency
In order to be consistent with the monitoring guidance employed for most
other permits across the state, monitoring frequency will now be based
on the flow divisions used to define facility class in the 15A NCAC 08C
.0302 regulations. Requirements described in 15A NCAC 2B .0508 (d)
for water supply plants and domestic wastewater plants were used as
guidance. Table 4-4 describes the way in which the monitoring
frequencies will be implemented for the parameters discussed above.
After sufficient data have been collected (eight to 12 data points over a
period of at least one year), the Permittee may petition for a reduction of
monitoring. If the samples are all recorded below laboratory detection
levels or at background concentrations compared with the receiving
waters, then a reduction of monitoring may be granted.
Table 4-4 - Suggested monitoring frequencies for membrane and sodium cationic
exchange water treatment plants
Facility Class
Monitoring Frequency
Conventional
Toxicants
Whole Effluent
Parameters
Toxicity (WET)
(except flow')
If limited- 2/Month
Permitted Flow < 0.5 MGD
Not limited - Monthly
Quarterly
If limited- Weekly
Permitted Flow > 0.5 MGD
Not limited - 2/Month
Notes:
1. If discharge is continuous, then continuous recording monitoring is required. If discharge is intermittent, then
instantaneous flow monitoring is required. For instantaneous flow monitoring, the duration of the discharge
must be reported.
23

Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
2522 S. Croatan Highway • Suite 2A • PA. Drawer 1929 • Nags Head, North Carolina 27959
October 15,2002
Ms. Valery Stephens
Point Source Branch
NC DWQ
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Permit NC 0083909
Dear Ms. Stephens,
Ot�RSOV�G��R'�h
Attached are the requested two extra copies of the NPDES permit renewal application for
Dare County's Rodanthe, Waves, Salvo Reverse Osmosis Water Treatment Plant. In
addition I have attached three copies of the lab analyses performed on the RO concentrate
of the RW S facility. This information pertains to page three of the renewal application.
If you need further information or have any questions please call me at [phone].
Sincerely,
Hobb Upchurch & Associates, P.A.
Ed Lawler
Cc: Bob Oreskovich, Dare County Water
William Brown, Dare County -RWS
Nags Head, NC • Telephone [phone] • Fax [phone] • e-mail: [e-mail]
Southern Pines • Myrtle Beach • Raleigh • Charlotte

NPDEs Application Form — Standard Form C-RO
Reverse Osmosis and other advanced water -treatment facilities
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
SECTION 1. APPLICATION AND FACILITY DESCRIPTION
Unless othuMse specified on this form ell items are to be completed It an Item is not appllcaWa Indlcale'NA'.
North Carolina NPDES Permit Number NC00 83909 (Itknown)
1. Applicant and facility producing discharge
This applies to the person, agency, firm, municipality, or any other entity that owns or is responsible for the pet nt as i facility.fic This may
or may
not be t e ame not name
as the
colloquial facility or as a substitute producing
for the discharge.
scha� Enter
ter the name of the applicant as It Is officially or
referr
use
NNAme Dara r`n„ni-v :Regional Water SVSI-e
nc �
Malling address of applicant: C�
Street address
UILY State NC -Zip Code 27948 \�� '.l
Telephone Number �a 1 2��(
(252 ) �'�'1-77RR Fax Number( 252 )
e-mail address Gin rn Arc c,Gos7
2. Mailing address of applicant's Authorized Agent /Representative: 1 o pis so>>'^ -
Complete this secfion if an outside consulting fimJ engineering firm will ad on behalf of the applicant,/ permitt6e - -
Hobbs, Upchurch&ASSOC.PA
Street address Dar e
City Nags Head County
State NC .Zip Code ?7959
Telephone Number (252 ) 441 -391 3 Fax Number ( 252) /
e-mail address elawler(dhobbsup .h com
3. Facility Location: a13697 /Ywy ya
Street address
City Rodanthe County Dare
State NC Zip Code 2 /9bb 252 987-1110
Telephone Number (252 ) 475-577R Fax Number( )
I certify that am familiar with the information contained in this application and that to the best of my knowledge and belief such
Information is true, complete, and accurate.
Billy Brown.
a7- acio 11,
algnaalre el APICarl MAMOU- N-" .
North Carolina General Statue 143.215.6B (l) provides that: Any person who knowing makes any else statement representation, or wrtiFlcaFlon In any application,
, a other document files or required t be maintained under Article 21 or regulations of the Environmental Management Commission Implementing that
record, report, plan
orregulationsregulations of Ithe Environmentalan Management commission Ily renders Immpleimenting the Article, shall be guilty of ermisd misdemeanor punishable byafinernott elzce d $10,000, 0ed under Article21
by Imprfsonmentnolt exceed six months, orby both. (1e U.S.C. Sectlon 1001 provides a punishment by a fine or not more than $1o,000 orimpdsonment not more than
5 years, or both, for a similar offense.) -

NPDRS Application .Form — Standard Foray C-RO
Reverse Osmosis and other* advanced water -treat facilities
SECTION
Ila BASIC DISCHAR69 DESCRIPTION
• Complete this section for each discharge from the facii'dy to surface waters.
SEPARA D ESC i NS 0 01SC Q E Ul D EVEN SEVE DISCHARGES s is aORIGl NATE IN
dlischarges values should
All values for an existing discharge should be representative at the twehve previous months of operation. If p
reflect best engineering estimatss.
1, Outfail Number 001 and Typeof the a (reject water, regeneration water, finer backwash, etc.)
Give the nature .
2, Discharge To End Date: l end.
'
if the discharge is scheduled to be discontinued within the next 5 years, give the date (or best estimate) the discharge wli
Stream Name: Blac Gut-
3, Discharge Receiving of the area. N the discharge Is to
Give the name of the waterway.(at the point of discharge) by which It is usually designated on published maps
an unnamed tributary, so state and gW the name of the first body of water fed by that tributary which is named on the map, e.g., UT to McIntire
Creak, where McIntire Creek Is the first water way that is named on the map and is reached by the discharge.
4. Discharge Type anti Occurrence
a. Check whether the discharge is continuous or Intemrittent: If the discharge Is intern tt 4 describe the frequency of discharge
• n Continuous • - © intermittent Frequency:.=�'!�'-''- •DY'^�"�' i „a water •
b. Enter the average number of days per week (during periods of discharge) this discharge occurs. .
7 days per week
5, 'Water Treatment Additives that
Complete the table below If flow from this odd contains water treatment additives. • lnctrde' tttiq addi & uoride are thadd d t finish orproduct
p
present fin the cscharge. For example: if finished product water Is used for regeneration (or if chiori .
a- 01mrfffn ohms [r hA ranorted.

e
A licatian Form - Standard Form C-RO
NPDES PP
water
-treatment facilities
Revers e Osmosis and other advanced
•
OUTFALL NUMBER
b
'
• Wastewater Characteristics
Y
60
the box beside
each constituent present in the effluent (dlsgharge water).
one of submittal of this application).
Check year
detemtinatio n is to be based on actual analytical data (minimum of one sample obtained within
This
Present
.
Parameter Present
Pameter
_
Total Residual Chorine 50060
Copper Copp
•01042 .
Ammonia
00610
iron
0 1045
.
. Organic nitrogen
.
00305
Lead
01051
�� ✓
00620
Magnesium
Nitrate .
.
00615
Manganese
.
0iow
Niue
Mercury
71900
Phosphorus
01062
•
� ��
Molybdenum
Sulfate
Nickel
01067
Sulfide
00745
01147
Sulfite
00740
Selenium
Bromide
71870 ,
Silver
01077
••
. Chloride
.00940
Potassium
00937
00929
Cyanide
00720
Sodium
Fluoride.
00951
Thallium
01059
ium
01152
Aluminum
.01105
'
01102
Antimony
01097
Tin
01092 .
• • •
01002 • ' . • •
•:: ��:U+r'�
Zinc .
74051
:7nW
illum
01012
Algidides
01007
Chlorinated, organic compound s74052
Barium
.
Boron
01022
Pesticides
•_
74053
Cadmium
01027
•Fecal colifomt
74055
Calcium �
'00918 . � -
Phenols
' 32730
Cobaft
01037
Surfactants
� 38260 -
Chromium
01034
Radioactivity
74050

♦.
SUPPLEMENTAL DOCUMENTATION

Rodanthe, Waves, Salvo Reverse Osmosis
Process Description
NPDES NCO083909
The RWS- RO is located in Rodanthe, NC and supplies potable water to the communities
of Rodanthe, Waves and Salvo on Hatteras Island. The Reverse Osmosis process is
capable of producing one million gallons per day and is supplied by two wells that tap the
brackish waters of the mid Yorktown aquifer. The RO removes dissolved solids, which
are carried in the concentrate stream (see process schematic) and discharged into
Blackmar Gut. The discharge location is part of the Pasquotank River Basin (Subbasin
30155). This discharge occurs whenever the plant is processing water.

o.
LOCATION MAPS

W I L D L I F E
c LiOht
R E F i.U.:G J E
Pauls
Uncle Xi yr
Landing
Greens N
Bl=k=r GI.-- �t''.�.
oar =
o\So�aCge P ;�Ga�,
ItN North Drain
ROAD CLASSIFICATION
PRIMARY HIGHWAY UGHTZUrY ROAD. HARD OR
HARD SURFACE IMPROVED SURFACE
SECONDARY HIGHWAY I.NIMPROVED ROAD
HARD SURFACE — _
Latitude 35° '4 "
Longitude 7502812"
Map # E36SE
Sub -basin . 30155
Stream Class
-.SA
Discharge Codes
22
Receiving Stream
Blackmar Gut
Design Q =
Permit expires03/ 31 / 03
0
w
000
7000 FEET
—eom..m.........r
CONTOUR INTERVAL 5 FEET
QUAD LOCATION
Dare County Regional Water System
NCO083909
Dare County

PROCESS SCHEMATIC

Well Feedwater 882gpm
TDS 1260mg/L
ited Water to
672 gpm
TDS 175 mg/L
Pretreatment
Scale inhibitor, acid
Post -Treatment
Chlorine, fluoride,
NaoH, Cor. InWb.
Blend 43 gpm
TDS 1260 mg/I
Rodanthe, Waves, Salvo Reverse osmosis WTP
NPDES # NCO083909
Concentrate 210 gpm
TDS 4520 mg/L
Ro System
Permeate 629gpm

0
DISCHARGE PLAN & PROFILE

e
LINE
Co ENTRRTE
p1ARCE LINE
NGTEL
3H
SNE
• CRP
=1

Siff PLAN
1" = 50'-0"
EXIST
BULKHEAD
B" CONCENTRATE
DISCHARGE LINE
SEAL EXIST
OPENING -
NOTE: FITTINGS BEYOND BULKHEAD
TO BE PVC SCH DETAIL A
1/2" = 1'-O" IS
3/8"X2" GALVANIZED
FLAT BAR BRACE W/
GALVANIZED LAG SCREWS
DESIGNED HKP,KDY
DETAILED BLS.MDD.KDY
0!"��r c BlaAshebor<
IY I CK
DATE

CLIENT: DARE COUNTY RWS WATER
DATE RECEIVED: 08/28/02
DATE REPORTED: 10/02102
Jc 1. - c c , , i_
ELAB SAMPLE NUMBER
0208214-01
CLIENT SAMPLE DESCRIPTIONISAMPLING DATE
Concentrate
Discharge
001
8/27/02
9:30:00 AM
REPORTING
USEPA
ANALYTES
LIMITS
METHOD
UNITS
CONC
Aluminum
50
200.7
pg/L
<50
Antimony
10
2001
pg/L
<10
Arsenic
5.0
200.7
pg/L
<5.0
Barium
5.0
200.7
pg/L
340
Beryllium
5.0
200.7
pg/L
<5.0
Boron
10
200.7
pg/L
3200
Cadmium
1.0
200.7
pg/L
<1.0
Calcium
1.0
200.7
mg/L
32
Chromium
5.0
200.7
pg/L
<5.0
Cobalt
5.0
200.7
pg/L
<5.0
Copper
5.0
200.7
pg/L
<5.0
Iron
50
200.7
pg/L
83
Lead
5.0
200.7
pg/L
<5.0
Magnesium
1.0
200.7
mg/L
63
Manganese
5.0
200.7
pg/L
<5.0
Mercury
0.20
245.1
pg/L
<0.20
Molybdenum
5.0
200.7
pg/L
<5.0
Nickel
5.0
200.7
pg/L
<5.0
Potassium
2.0
200.7
mg/1-
150
Selenium-
5.0
200.7
pg/L
<5.0
Silver
1.0
200.7
pg/L
<1.0
Sodium
10
200.7
mg/L
1700
Thallium
10
200.7
pg/L
<10
Tin
10
200.7
pg/L
10
Titanium
5.0
200.7
pg/L
<5.0
Zinc
10
200.7
pg/L
<10
See attached page for definition of terms and qualifiers.
227 French Landing Drive Nashville, TN 37228 615-345-1115 FAX [phone]

n�
CLIENT: DARE COUNTY RWS WATER
DATE RECEIVED: 08/28/02
DATE REPORTED: 10/02/02
ELAB SAMPLE NUMBER
0208214-01
CLIENT SAMPLE DESCRIPTIONISAMP LING DATE
Concentrate
Discharge
001
8I27/02
9:30:00 AM
REPORTING
USEPA
ANALYTES
LIMITS
METHOD
UNITS
CONC
Ammonia, Distilled (as N) (7)
0.10
350.1
mg/L
5.7
Bromide (7)
2.0
300.0
mg/L
6.8
Chloride
50
325.2
mg/L
1700
Cyanide, Total
0.0050
335.3
mg/L
<0.0050
Nitrate + Nitrite (as N)
0.25
353.2
mg/L
<0.25
Phenolics
0.010
420.2
mg/L
<0.010
pH- Laboratory (1)
NA
150.1
Units
8.2 @ 24-C
Sulfate
1.0
375.4
mg/L
4.4
Sulfite (5)
2.0
377.1
mg/L
<2.0
TKN (7)
0.50
351.2
mg/L
11
See attached page for definition of terms and qualifiers.
ELAB
D. Rick Davis
Vice Preside

ANALYTICAL REPORT NOTES, TERMS AND QUALIFIERS (INORGANIC)
Notes:
The metals and cyanide reporting limits (RLs) have been statistically determined to be
no less than three standard deviations as defined in 40 CFR 136, Appendix B,
Revision 1.11. All other reporting limits are referenced from the specific analytical
method.
Terms:
NA Not Applicable
NR Not Requested
OuaRfiers:
B The reported value is less than the practical quantitation limit (PQL, project
defined) but greater than or equal to the RL.
E The reported value is estimated due to the presence of matrix interference.
N Predigested spike recovery not within control limits.
* RPD or absolute difference for Duplicate analysis not within control limits.
^^ Reference Standard Methods 19th edition.
(1) pH analyzed outside USEPA specified holding time. pH must be measured
immediately after sample collection.
(2) The sample pH did not meet the preservation guidelines. Therefore the pH
was adjusted upon receipt.'
(3) Reference Standard Methods 17th edition for the distillation method.
(4) The sample was analyzed out of the USEPA holding time.
(5) The sample was received in the laboratory out of the USEPA holding time.
(6) The shipping cooler temperature exceeded 6°C upon receipt to ELAB of
Tennessee, LLC.
(7) Analysis was subcontracted
L:\REYORTS\ART&QIN I.dl clabAOC

Ivy
Client:.DARE COUNTY RWS WATER
Date Reported: 09/13/02
ELAB SAMPLE NUM BIC
I ri".urw0A.7
j vavv�+= V� i
-----------
--------
DATE SAMPLED
-----------
NA
08/27/02
DATE RECEIVED
NA
08/28/02
DATE ANALYZED
09/01/02
09/03/02 z.
-----------)
-------------------
-----------
M.BLANK
lConcentratel
CLIENT SAMPLE DESCRIPTION
I
Discharge
------------------------
PCB ORGANICS
-----------
-----------
BY USEPA METHOD 8082 1
DL
CONC
CONC
-----------�
-----------------------
PCB-1016
1 0.25
-----------
j< 0.25
j< 0.25
PCB-1221
1 0.25
j< 0.25
j< 0.25
PCB-1232
1 0.25
(< 0.25
j< 0.25
PCB-1242
1 0.25
j< 0.25
j< 0.2S
PCB-1248
( 0.25
I< 0.25
j< 0.25
PCB-1254
1 0.25
j< 0.25
j< 0.25
I PCB-1260
1 0.25
j< 0.25
j< 0.25
ALL COMPOUNDS EXPRESSED IN MICROGRAMS/LITER UNLESS OTHERWISE NOTED.
ALL NON -DETECT VALUES ARE REPORTED AS cDL (MODIFIED TO REFLECT DILUTIONS/SAMPLE VOLUME).
SEE ATTACHED PAGE FOR DEFINITIONS OF TERMS AND QUALIFIERS.
E1
{1' 1
. Rick Dav s
vice Pres' ent

Client: DARE COUNTY RWS WATER
Date Reported: 09/13/02
{ ELAB SAMPLE NUMBER
{
PlBLK0829
10208214-Ul
1
---------------------{-----------{-----------)
{ DATE SAMPLED
NA
08/27/02
{ DATE RECEIVED
( NA
{ 08/28/02 {
DATE ANALYZED
{ 09/01/02
{ 09/03/02 {
--------------------------------------{-----------{-----------{
{ M.BLANK
{Concentrate{
{
'CLIENT SAMPLE DESCRIPTION
{
{ Discharge
-----------------{-----------{-----------�
PESTICIDE ORGANICS
{
•
{ BY USEPA METHOD 8081
{ DL
{ CONC
( CONC
----------------{-----------{-----------{
Aldrin
10.0050
1<0.0050
1<0.0050 {
Alpha-BHC
10.0050
1<0.0050
1<0.0050
{ Beta-BHC
j0.0050
1<0.0050
1<0.0050 {
{ Chlordane
{ 0.025
{< 0.025
{< 0.025 {
4,4'-DDD
{ 0.010
{< 0.010
{< 0.010 {
{ 4,4'-DDE
{ 0.010
k 0.010
{< 0.010 {
4,4'-DDT
{ 0.010
k 0.010
(< 0.010 {
Delta-BHC
10.0050
1<0.0050
1<0.0050 {
{ Dieldrin
{ 0.010
(< 0.010
(< 0.010 {
{ Endosulfan I
10.0050
1<0.0050
1<0.0050 {
Endosulfan II
{ 0.010
j< 0.010
{< 0.010 {
{ Endosulfan Sulfate
{ 0.010
{< 0.010
{< 0.010
{ Endrin
1 0.010
{< 0.010
{< 0.010 {
Endrin Aldehyde
{ 0.010
{< 0.010
{< 0.010
{ Gamma-BHC
j0.0050
1<0.0050
1<0.0050
Heptachlor
10.0050
1<0.0050
1<0.0050 {
{ Heptachlor Epoxide
10.0050
1<0.0050
1<0.0050 {
Toxaphene
{ 1.0
{< 01.0
{< 1.0
ALL COMPOUNDS EXPRESSED IN MICROGRAMS/LITER UNLESS OTHERWISE NOTED.
ALL NON -DETECT VALUES ARE REPORTED AS <DL (MODIFIED TO REFLECT DILUTIONS/SAMPLE VOLUME).
SEE ATTACHED PAGE FOR DEFINITIONS OF TERMS AND QUALIFIERS.
227 French Landing Drive Nashville, TN 37228 615-345-1115 FAX [phone]

71
Client: DARE COUNTY RWS WATER
Date Reported: 09/05./02
ELAB SAMPLE NU t;m
I niaa &%www a
J v­. ___ -_
-----------
DATE SAMPLED
NA
08/27/02
DATE RECEIVED
NA
( 08/28/02
DATE ANALYZED
09/0402
09/05/02 1
-----------I
--------------------------
-----------
M.BLANK
lConcentratel
CLIENT SAMPLE DESCRIPTION
Discharge
001
-----------�
----------------------
HERBICIDE ORGANICS .
-----------
I
BY USEPA METHOD 8151
1 DL CONC
-----------
CONC
-----------�
-------------------
2,4-D
1.2 j< 1.2
j< 1.2
2,4,5-TP (Silvex)
0.12 l< 0.12
j< 0.12
ALL COMPOUNDS EXPRESSED IN MICROGRAMS/LITER UNLESS
OTHERWISE NOTED.
ALL NON -DETECT VALUES ARE REPORTED AS <DL (MODIFIED TO REFLECT DILUTIONS/SAMPLE VOLUME).
SEE ATTACHED PAGE FOR DEFINITIONS OF TERMS AND QUALIFIERS.
El
D. Rick D S
Vice Pre ent
ashville, TN 37228 615-345-1115
FAX [phone]
227 French Landing Drive N

Page 2
ELAB, Inc. Date: 09=Sep-02
CLIENT: Elab of Tennessee, LLC Client Sample ID: 0208214-01
Lab Order: F02081087 Collection Date: 8/27/02 9:30:00 AM '
Project: Dare County S N C- 0 0 W 5� 0 c( Sample Description:
Lab ID: F02081087-001 Matrix: Waste Water
Analyses Result RL Qual Units DF Date Analyzed
ANIONS*BY ION CHROMATOGRAPHY E300.0 PrepDate:
Bromide 6.8 2.0 mg/L
Analyst: MCA
20 8/30/02 7:32:00 PM
Qualifiers: ND - Not Detected at the Reporting Limit S - Spike Recovery outside accepted recovery limits
J - Analyte detected below quanititation limits R - RPD outside accepted recovery limits
B - Analyte detected in the associated Method Blank E - Value above quantitation range
* - Value exceeds Maximum Contaminant Level

CLIENT: DARE COUNTY RWS WATER
DATE RECEIVED: 09113/02
DATE REPORTED: 10102/02
ELAB SAMPLE NUMBER
0209089-01
CLIENT SAMPLE DESCRIPTIONISAMPLING DATE
Concentrate
Discharge
#001
9/12102
10:00:00 AM
REPORTING
USEPA
ANALYTES
LIMITS
METHOD
UNITS
CONC
Fluoride (7)
0.10
9056
mg/L
5.3
MBAS (7)
0.10
425.1
mg/L
<0.10
Sulfide (7)
0.020
9030B
mg/L
<0.020
See attached page for definition of teens and qualifiers.
ELAB
D. Rick Dav'
Vice President
227 French Landing Drive Nashville, TN 37228 615-345-1115 FAX [phone]

ANALYTICAL REPORT NOTES, TERMS AND QUALIFIERS (INORGANIC)
Notes:
The metals and cyanide reporting limits (RLs) have been statistically determined to be
no less than three standard deviations as defined in 40 CFR 136, Appendix B,
Revision 1.11. All other reporting limits are referenced from the specific analytical
method.
Terms:
NA Not Applicable
NR Not Requested
Qualifiers:
B The reported value is less than the practical quantitation limit (PQL, project
defined) but greater than or equal to the RL.
E The reported value is estimated due to the presence of matrix interference.
N Predigested spike recovery not within control limits.
* RPD or absolute difference for Duplicate analysis not within control limits.
** Reference Standard Methods 19th edition.
(1) pH analyzed outside USEPA specified holding time. pH must be measured
immediately after sample collection.
(2) The sample pH did not meet the preservation guidelines. Therefore the pH
was adjusted upon receipt.,
(3) Reference Standard Methods 17th edition for the distillation method.
(4) The sample was analyzed out of the USEPA holding time.
(5) The sample was received in the laboratory out of the USEPA holding time.
(6) The shipping cooler temperature exceeded 6"C upon receipt to ELAB of
Tennessee, I.LC.
(7) Analysis was subcontracted
L:\REPORTS\ART&Q/N Ieaeal elab.DOC

Florida Radiochemistry Services, Inc.
Sample LogLogina,1u_ c o o$ 3 9 0 c{
Client: Elab of Tennessee Date 1 Time Work order #
Received
Client Contact: Herbie Johnson 8130/0212:00 0208201
Client P.O.
Project I.D. 0208214
Lab Sample I.D. Client Sample I.D. Sample Analysis
Date/Time Requested
0208201-01 0208214-01 8127102 09:30 Ga, Gb, Ra226, Ra228
Analysis Results
Gross Alpha
7.1 **
Gross Beta
112 **
Error +1-
11.7
Error +1-
20.8
MDL
18.6
MDL
30.7
EPA Method
SW 846-9310
EPA Method
SW 846-9310
Prep Date
913102
Prep Date
913102
Analysis Date
914102
Analysis Date
914/02
Radium 226
2.4
Radium 228
<1.0
Error +1-
0.3
Error +1-
0.7
MDL
0.1
MDL
1.0
Method
SM 7500
Method
SM 7500
Prep Date
913102
Prep Date
913102
Analysis Date
919102
Analysis Date
919102
Units
pCili
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Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
2522 S. Croatan Highway • Suite 2A • P.O. Drawer 1929 • Nags Head, North Carolina 27959
September 24, 2002
Mrs. Valery Stephens
NCDENR
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Permit Renewals:
RWS RO NCO083909
CHW RO NC 0085707
HUA Project # DR0202
Dear Mrs. Stephens,
R
L-1'
EW EOCT0
l
DENAVATER QUALITY
POINT SOURCE BRANCH
Attached please find the NPDES permit renewal applications for the Rodanthe, Waves,
Salvo RO WTP and Cape Hatteras RO WTP. Both facilities have NPDES permits that
expire 3/31/03. Specific wastewater characteristics specified on page 3 of this form will
be analyzed and forwarded to you as soon as we receive the results from the lab.
Thank you for your assistance in the application review.
Sincerely,
Hobbs, Upchurch & Associates, P.A.
Ed Lawler
Nags Head, NC • Telephone [phone] • Fax [phone] • e-mail: [e-mail]
Southern Pines • Myrtle Beach • Raleigh • Charlotte