NC0083909_Permit Issuance_20090313

AA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
March 13, 2009
Mr. Terry Wheeler, Manager
Dare County
600 Mustian Street
Kill Devil Hills, North Carolina 27948
Dee Freeman
Secretary
Subject: Issuance of NPDES Permit NCO083909
Rodanthe/Waves/Salvo Reverse Osmosis WTP
Dare County
Dear Mr. Wheeler:
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 October 15, 2007 (or as subsequently amended).
This final permit includes no major changes from the draft permit sent to you on December 17, 2008. For
clarification, a footnote regarding the cyanide effluent limit was added to the permit.
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 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 Karen Rust at telephone number [phone].
Sincerely,
��Y�'''`
4(-. Coleen H. Sulhns�
cc: Central Files
Washington Regional Office/Surface Water Protection Section
NPDES Files
Aquatic Toxicology Unit
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
One
Location: 512 N. Salisbury St. Raleigh, NoM Carolina 27604
NorthCarolina
Phone: [phone] \ Fax: [phone] \ Customer Service: l-B77.623-6748
//f�
Internet www.ncwaterquality.org
ur{•!
Nat�yl N
An Equal Opportunity\ Allinnaeve Action Employer
v

Permit NCO083909
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
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 April 1, 2009.
This permit and authorization to discharge shall expire at midnight on December 31, 2012.
Signed this day March 13, 2009.
Ity ..-
„- < Coleen H. Sullins, Dir ctor
Division of Water Quality
By Authority of the Environmental Management Commission

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.

NCO083909 - Rodanthe, Waves, Salvo R.O. WTP
Facility
Latitude:
35°35'43" Sub -Basin: 03-01-55
Location
Longitude:
75°28'12"
Ouad#:
E36SEtRodanthe, NC
Stream Class:
SA-HQW
Dare County Regional Water System
Receivin°Stream:
Blackmar Gut
North
Rodanthe, Waves, Salvo R.O. WTP
Permitted Flow:
0.3 MGD Map not to scale
NC0083909

Permit NC0083909
A. (I.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized to discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee as
OT%Am snarl halmly.
F�'hLUET�, . �._ Y �s�T
. IIt
CMS► A ElSTICS ,;
:_-,.._.. --
Parameter Cafes)
= r
�� ,;ys
M �: �. f ♦
x��,r .�� r °
OVlO ING�REQUI EN�ENIS
,z r.�P ; : , r
�-�'i
�,�F°� AM
r
MonthrY
//��1 Q ..z.'t..
:Airy
Weekl :r
Y
M�1$.....
Average
^ .;Dai[Meas
Y ; ,;,PA
Maximum
re a
�} `-t,. _ •.s 1,ai.• s
Fyert\17
Sam I:�
.'-i•r, -
-
Sam re c tioni�
:',3.' 7 x.*,°-z'x °,1 ., ...c,l� :.d'i.4
Flow (50050)
0.3 MGD
Continuous
Recording
Effluent
Total Dissolved Solids 70295
Monthly
Grab
Effluent
pH2 (00400)
Monthly
Grab
Effluent, Upstream,
Downstream'
Temperature (00010)
Monthly
Grab
Effluent, Upstream,
Downstream'
Salinity (00480)
Monthly
Grab
Effluent, Upstream,
Downstream'
Dissolved Oxygen (00300)
Monthly
Grab .
Effluent, Upstream,
Downstream'
Conductivity (00094)
Monthly
Grab
Effluent, Upstream,
Downstream'
Ammonia Nitrogen 00610
Monthly
Grab
Effluent
Total Nitrogen 00600
Monthly
Grab
Effluent
Total Phosphorus 00665
Monthly
Grab
Effluent
Total Copper 01042
Monthly
Grab
Effluent
Total Zinc 01092
Monthly
Grab
-Effluent
Total Selenium3 01147
71 /j/L
2 / Month
Grab
Effluent
Total C anide3.4 00720
1 N L
2 / Month
Grab
Effluent
Total Arsenic3 01002
50
2 / Month
Grab
Effluent
Total Cadmium3 01027
5 L
2 / Month
Grab
Effluent
Total Chromium3 01034
20 ij L
2 / Month
Grab
Effluent
Total Lead3 01051
25 L
2 / Month
Grab
Effluent
Total Mercu 3 71900
25 n L
2 / Month
Grab
Effluent
Total Nickel3 01067
8 L
2/ Month
Grab
Effluent
Total Silver 01077
I
Monthly
I
Grab
Effluent
Acute Toxici GE3E
Quarterly
Composite
Effluent
Footnotes:
1. Upstream = 27 feet north of the outfall, Downstream = 50 feet south of the outfall.
2. The Effluent pH shall not be less than 6.8 standard units nor greater than 8.5 standard units.
3. After collection of twelve months of data, the permittee may request the Division reevaluate the data and reasonable
potential to exceed water quality standards.
4. The Division shall consider all cyanide values reported below 10 µg/L to be "zero" for compliance purposes. However, the
Permittee shall record and submit all values reported by a North Carolina -certified laboratory, even if these values fall
below 10 jig/L.
5. Acute Toxicity (Mysidopsis babia) 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 MONITORING (QUARTERLY)
The Permittee shall conduct acute toxicity tests on a guartertq 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 Section
North Carolina Division of Water Quality
1621 Mail Service Center
Raleigh, N.C. 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no later
than 30 days after the end of the reporting period for which the report is made.
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 Section 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.
If the Permittee monitors any pollutant more frequently then required by this permit, the results of
such monitoring shall be included in the calculation & reporting of the data submitted on the DMR
& all AT Forms submitted.
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.

NCDUF NO Comment on Dare Co. ROWTP's- Draft NPDES Permi...
Subject: NCDMF NO Comment on Dare Co. ROWTP's- Draft NPDES Permits -Cape Hatteras &
Rodanthe
From: Lynn Henry <[e-mail]>
Date: Mon, 02 Feb 2009 09:58:45 -0500
To: Karen Rust <[e-mail]>
CC: Anne Deaton <[e-mail]>, Jeanne Hardy <[e-mail]>, Sara
Winslow <Sara.Winslow @ncmail.net>, Kathy Rawls <Kathy.Rawls @ncmail.net>
Ms. Rust,
NC Division of Marine Fisheries will have NO COMMENTS on the Draft NPDES Permits for
the Dare Co. ROWTP's below.
1. Cape Hatteras ROWTP, NPDES # NCO085707
2. Rodanthe/Waves/Salvo ROWTP, NPDES # NC0083909.
Thanks for sending me the draft permits for review. LYNN
Lynn T. Henry [e-mail] 1-800-405-7774 (NC only)
Marine Biologist 252-796-1322
NC Division of Marine Fisheries Fax: [phone]
1107 Hwy 64E
Columbia, NC 27925
1 of 1 3/12/2009 11:04 AM

Draft Permit, NC0083909 Rodanthe
Subject: Draft Permit, NCO083909 Rodanthe
From: Susie Meadows <[e-mail]>
Date: Mon, 05 Jan 2009 15:37:52 -0500
To: Karen Rust <[e-mail]>
Hi Karen,
I was looking over the 12/17/08 Draft Permit for Rodanthe/Waves/Salvo RO WTP (NC0083909).
In section A.(2.) it states the Toxicity Test as Acute Toxicity Permit "Limit."
However, they have been "Monitoring" up until this point, shouldn't that indicate "monitoring" at 90%
rather than having a "Limit" at 90%?
Thanks.
Susie
Susan Meadows, Environmental Biologist
Aquatic Toxicology Unit
DWQ/Environmental Sciences Section
4401 Reedy Creek Road Raleigh, NC 27607
[e-mail]
t: [phone]
f: [phone]
1 of 1 3/ 12/2009 1:35 PM

State of North Carolina
Department of Environment J (� d
and Natural Resources
Division of Water Quality UtG 2 y 2008
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Coleen H. Sullins, Director
MEMORANDUM
HEUPON SWUMM
December 17, 2008
To: Shannon Jenkins
NC DENR / DEH / Shellfish Sanitation
From: Karen Rust
Eastern NPDES Program
Subject: Review of Draft NPDES Permit NCO083909
Rodanthe /Waves/ Salvo Reverse Osmosis WTP
Dare County
AAA
HCDENR
DNORTH CAROLINA DEPARTMENT OF
.N,RONMENT AND NATURAL RESOIJRCES
DEC 1.0 2008 L
1 7,HEUY1SN UNffATM
Please indicate below your agency's position or viewpoint on the draft ermit and return this form by January 26,
2009. If you have any questions on the draft permit, please contact t� ber or e-mail address
listed at the bottom of this page. `F O VE
DEC 11 0 2008
RESPONSE: (Check one)
©ed the stated effluent limits
Concur P th the issuance of this permit provided the facility is ope ajne�-�cpR �'�
are met prior to discharge, and the discharge does not contravene !!�j�I!!7��� -aceed e ���y
Concurs with issuance of the above permit, provided the followinconditions=OURCE BRANCH
❑ Opposes the issuance of the above permit, based on reasons stated below, or attached:
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 919 807-6400 (fax) 919 807.6495
VISIT US ON THEINTERNEr0hftpJ/h2o.enr.state.nc.us/NPDES Karen.Rust®ncmail.net

THE DAILY ADVANCE
215 S. Water Street, Elizabeth City, NC 27909
NC DENR/DWQ/PT. SOURCE BRANCH
DINA SPRINKLE
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
PUBLISHER'S AFFIDAVIT
NORTH CAROLINA
PASQUOTANK COUNTY
CopyLine: PN—Nat. Poll. Discharge
Lines: 122
Total Price: $263.60
"*This is not a bill*"
Account: 2119700 AD ID: 7154530
AD ID: 7154530
Before the undersigned, a Notary Public of said County and State, duly commissioned, qualified and authorized by law to
administer oaths, personally appeared Maureen Brinson who being first duly sworn, deposes and says that she is the
Manager of Accounting and Administration of The Daily Advance engaged in the publication of a newspaper known as
The Daily Advance, published, issued and entered as second class mail in the City of Elizabeth City in said County and
State; is authorized to make this affidavit and sworn statement; that the notice or other legal advertisement entitled PN-
-Nat. Poll. Discharge, was published in The Daily Advance on the following dates:
Sunday, December 21, 2008 Page: D1
and that the said newspaper in which such notice,
STATE PUBLIC ORTHH CCAROLINA
paper, document, or legal advertisement was published
ENVIRONMENT
was, at the time of each and every such publication, a
AL MANAGEMENT
COMMISSIONMPDES UNIT
newspaper meetingall of the requirements and
q
1617 MAIL SERVICE CENTER
RALpGN. NC 27699-1617
qualifications of Section 1-597 of the General Statutes
NOTIFICATION OF INTENT
TO ISSUE A NPDES
of North Carolina and was a qualified newspaper within
WASTEWATER PERMIT
the meaning of Section 1-597 of the General Statutes of
On the basis of thorough
North Carolina.
staff review and application
1
of NC General Statute
r
143.21S.1 and 15A NCAC
j
02N.0109 and other lawful
standards and regulations,
the North Carolina Environ-
mental Management Com-
and subscribed before me this 21 day
missionAffirmed
ionalproPollutanthsDis-
charge Elimination System
d
(NPDis-
eel wastewato
of December 2008
permit the
person(s) listed below effec-
tive 45 days from the pub-
lish date of this notice.
Written comments regard-
ing the proposed permit vrill
C\'uu,
be accepted until 30 days
after the publish date of this
U_ (Notary Public Signature)
notice. All comments
received prior to that date
are considered in the final
determinations regarding
the proposed permit. The
Joella Snow
Director of the NC Division
of Water Quality may decide
(Notary Public Typed Name)
to hold a public meeting for
the proposed permit, should
the Division receive a soifi-
cant degree of public Inter-
est.
My commission expires November 22, 2011
Copies of the draft permit
and other wpporting infor-
mation on file used to
determine conditions
present in the draft permit
are available upon request
the
and payment of costs of
reproduction. Mail com-
ments andlor requests for
Information to the NC DI6
sion of Water Quality at the
Anus, ArldrPti nr Ail ninA

Sprinkle [phone]-at
the Point Source Branch.
Please include the NPDES
permit number (below) in
any communication. Inter-
ested persons may also visit
the Division of Water Qual-
Ity at 512 N. Salisbury Street,
Raleigh NC 27604.1148
between the hours of 8:00
a.m, and 5:00 pm. to review
information on file.
Camden County (P.O. Box
190, Camder% NC 27921) has
applied for renewal of
NPDES permit NC00S6681
for the Camden County
Reverse Osmosis WTP in
Camden County. This per-
mitted facility discharges
0.432 MGD wastewater to
the Pasquotank River In the
Pasquotank River Basin.
Currently, total residual
chlorine is water quality
limited. This discharge may
affect future allocations In
this potion of the Pasquo-
tar* River Basin.
Dare County (P.O. Drawer
1000, Manteo, NC 27954)
has arlied for renewal of
NPDES permit NC0085707
for the Cape Hatteras
Reverse Osmosis WTP in
Dare County. This permit-
ted facility discharges 1.8
MGD wastewater to the
Pamlico Sound In the Pas-
quotank River chromium, m nickel,
and selenium are water
quality limited. This dis-
charge may affect future
allocations in this portion of
the Pasquotank River Basin.
Dare County (P.O. Drawer
1000, Manteo, NC 27954)
has applied for renewal of
NPDES permit KC0083909
for the
RodantheNaves/Salve
Reverse Osmosis WTP in
Dare County. This permit-
ted facility discharges 0.3
MGD wastewater to an
unnamed tributary to
Blackmer Gut in the Pasquo-
tank River Basin. Currently,
selenium, cyanide, arsenic,
cadmium, chromium, lead,
mercury, and nickel are
water quality limited. This
discharge may affect future
allocations in this portion of
thePasquotank River Basin.
1221

DENR/DWQ
FACT SHEET 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 County
Miscellaneous
Receiving Stream:
Blackmar Gut
Regional Office:
Washington
Stream Classification:
SA-HQW
State Grid / USGS Quad:
E36SE
303(d) Listed?
no
Permit Writer:
Karen Rust
Subbasin:
03-01-55
Date:
December 17, 2008
Drainage Area (mi2):
NA
Lat. 350 35' 43" N Long. 750 28' 12" W
Summer 7Q10 (cfs)
NA (tidal)
Winter 7Q10 (cfs):
NA (tidal)
30Q2 (cfs)
NA (tidal)
Average Flow (cfs):
NA (tidal)
IWC (%):
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 July 31, 2003 and expired December 31, 2007. The Permittee
applied for renewal of the NPDES permit by submitting Standard Form C-RO on June 21, 2007.
Instream Monitoring and Verification of Existing Conditions and DMR Data Review
This facility discharges to Blackmar Gut (classified SA-HQW), located within sub -basin 03-01-
55 of the Pasquotank River Basin. In the September 2007 Pasquotank Basinwide Water Quality
Plan, some of the waters in this subbasin were rated as impaired for fecal coliform bacteria.
Blackmar 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)).
Effluent data from July 2005 through June 2008 were compiled from Discharge Monitoring
Reports (DMRs) for conventional parameters, metals and toxicants.
Correspondence
The Washington Regional Office (WaRO) conducted site visits to this facility in November
2004, May 2006, and September 2007. The facility received a compliant rating at each
inspection.
Fact Sheet.
NPDES N00083909 Rcnnkal
Page 1

PERMITTING STRATEGY
Waste Load Allocation (WLA)
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 '/2 the water quality standard (since Blackmar Gut is classified
HQW).
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 July 2005 through June
2008. Calculations included: arsenic, cadmium, chloride, chromium, copper, cyanide, lead,
mercury, nickel, selenium, silver, zinc, fluoride and iron.
Results suggest reasonable potential for the facility to discharge arsenic, cadmium, cyanide,
chromium, lead, mercury, nickel, and selenium. These parameters will be limited and the
monitoring frequency will be increased to twice per month.
Copper, silver, and zinc showed reasonable potential to exceed water quality standards. Copper,
silver, 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. Monitoring for
Chloride, Fluoride, and Iron will be eliminated from the permit because there is no saltwater
standard for these parameters. Monitoring for total suspended solids will also be eliminated from
the permit based on the latest water treatment plant permitting strategy.
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:
• Elemination of monitoring for total suspended solids, chloride, fluoride, and
iron.
• Addition of limits and increase in monitoring frequency to twice per month for
arsenic, cadmium, cyanide, chromium, lead, mercury, nickel, and selenium.
• Increase of monitoring frequency for silver to monthly.
• Reduction of TSS monitoring to quarterly.
New Weekly Average and Daily Maximum limits are derived from the latest NC/EPA policies
considering V/2 FAVs and allowable concentrations based on reasonable potential.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: December 21, 2008
Permit Scheduled to Issue: February 12, 2009
NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit, please contact
Karen Rust at [phone].
Fact Shea
NPDES NCO0£3909 Renewed
Page

REASONABLE POTENTIAL ANALYSIS
Rodanthe/Waves/Salvo RO WTP
NCO083909
Time Pedod
0
Ow (MGD)
0.3
WWTP Class I
7010S (ds)
0
lwC (%) ® 7010S
100
701oW(ds)
0
07010W
100
3002 (ds)
0
® 3002
100
Avg. Stream Flow, OA (ds)
0
0 OA
100
Rec%ft Stream Blackmar
Gut
Stream Class SA -HOW
Outfall 001
Ow-0.3MGD
STANDARDS &
PARAMETER
TYPE
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
11)
NCWos/ 11FAV/
n ID►t HnPied CW Aftombl►OW
Ctuonk AMIN
Acute: WA
Arsenic
C
50
uWL
12 10
65.0
Reasonable potential, Include limit
_ _ _
Chronic:._.5�—._.-----------
— _
Acute: WA
Chloride
NC
230.0
mgrL
36 36
6362.3
No standard for saltwater
_ _ _
Chronic:
--------------------------------
Acute: 42
Cadmium
NC
5 42
ugfL
12 9
37.5
Reasonable potential, Include limit
_ _ _
Chronic:-- 5--
---------- -----------------•---
Acute: 570
Chromium
NC
20 570
ugtL
12 10
231.0
Reasonable potential, include limit
_ _ _
Chronic: ---20 —
-- —. I —--------- - — — —
Acute: 6
Copper
NC
3 AL 5.8
uWL
36 26
131.4
_ _ _
No fimtt, action level parameter
---- ----- — ---------------
Chronic:--- 3--
— -
Acute: 1
Cyanide
NC
1 N 1
10
ugfL
13 11
5.0
_ _ _ --- .—
Reasonable potential, include limit
.—._.— —.—.—._.—.—._------
Chronic: -.—_—
_
Acute: WA
Fluoride
NC
1,800
ugfL
12 12
14.068.0
No standard for saltwater (Limited data)
------ — — — ----- ---------
_ _
Chron_ic: '—j,800
- -
Acute: 221
Lead
NC
25 N 221
ugrL
12 10
2163.8
_ _ _ —
Reasonable`potential; include limit
— — — — --- — ----- -------
Chronic:---25
- -
Acute: WA
Mercury
NC
25
2.0000
n9fl.
12 8
342.0000
- —
Reasonable potential, Include limit —•—•_------
---------- --
Chronic:_— 25
------
Acute: WA
Iron
NC
1.000
uWL
12 12
1.178.4
_ _ _ _
No standard for saltwater (Limited data) .—_—_—
Chronic: 1,000
Acute: 75
Nickel
NC
8 75
uWL
12 9
192.0
_ _ _
Reasonable potential, include Itmit
Ch
Acute: WA
vg/L
0 0
WA
------ ------------- —•—•--------
Chronic::rror A Typo
Acute: WA
Selenium
NC
71.0
ugfL
72 51
101.0
-- _
-71 —
Reasonable potential. Include fimlt—_—_-----•—•
--- - ------- —
Chron_ic:
-
Acute: 2
Silver
NC
0.10 AL 1.9
uWL
12 9
211.5
_ _ _ — —
-
No limit, action level parameter ---------------
------ — — ---. —
Chronic:. 0.
Acute: 95
_
Zinc
NC
86 AL 95
ugrL
36 25
988.4
_ _ — - —
'
No limit, action level parameter---------------
- -------- —•
Ctaon�: 66
.Legend. " Freshwater Discharge
C - Carcinogenic
NC - Non-camnogenic
A = Aesthetic
npdesrpa 2004031nc0083909a,rpa
3/12/2009

Table 1. Project Information
Facility Name
WWTP Grade
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
Stream Class
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
Time Period
Data Source(s)
Rodanthe/Waves/Salvo RO WTP
NCO083909
001
0.3
Blackmar Gut
SA-HQW
0.0
0.0
0.0
0.0
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Part a
Par11
Par12
Par13
Parl4
Par15
Table 2. Parameters of Concern
Name Type Chronic Modifier Acute PQL Units
Arsenic
C
50
ug/L
Chloride
NC
230
mg/L
Cadmium
NC
5
42
ug/L
Chromium
NC
20
570
ug/L
Copper
NC
3
AL
5.8
ug/L
Cyanide
NC
1
N
1
10
ug/L
Fluoride
NC
1800
ug/L
Lead
NC
25
N
221
ug/L
Mercury
NC
25
2.0
ng/L
Iron
NC
1000
ug/L
Nickel
NC
8.3
75
ug/L
ug/L
Selenium
NC
71
ug/L
Silver
NC
0.1
AL
1.9
ug/L
Zinc
NC
86
AL
95
ug/L
npdes rpa 2004031 nc0083909a, input
3/12/2009

REASONABLE POTENTIAL ANALYSIS
1
2
3
4
5
6
7
8
9
10
11
12
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
63
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
Arsenic I Chloride
Date
Data
BDL-112DL
Apr-2008
7.0
7.0
Jan-2008
20.0
10.0
Oct-2007
20.0
10.0
Jul-2007
20.0
20.0
Apr-2007
20.0
20.0
Jan-2007
20.0
1
20.0
W-2006
2.0
2.0
Jul-2006
5.0
5.0
Apr-2006
5.0
5.0
Jan-2006
5.0
5.0
Oct-2005
5.0
5.0
Jul-2005
5.0
5.0
Results
Std Dev.
6.7082
Mean
9.5000
C.V.
0.7061
n
12
Mull Factor= 3.2500
Max. Value 20.0
Max. Pred Cw 65.0
Date Data
Jun-2008
May-2008
Apr-2008
Mar-2008
Feb-2008
Jan-2008
Dec-2007
Nov-2007
Oct-2007
Sep-2007
Aug-2007
Jul-2007
Jun-2007
May-2007
Apr-2007
Mar-2007
Feb-2007
Jan-2007
Dec-2006
Nov-2006
Oct-2006
Sep-2006
Aug-2006
Jul-2006
Jun-2006
May-2006
Apr-2006
Mar-2006
Feb-2006
Jan-2006
Deo2005
Nov-2005
OCt-2005
Sep-2005
Aug-2005
Jul-2005
BDL=1/2DL
1983 1983.0
2083 2083.0
1686 1686.0
1959 1959.0
1612 1612.0
2083 2083.0
1512 1512.0
2060 2060.0
1,799 1799.0
1,799 1799.0
1,737 1737.0
1,849 1849.0
1,799 1799.0
1,663 1663.0
1,624 1624.0
1,409 1409.0
2,049 2049.0
2.054 2054.0 .
1,638 1638.0
1,401 1401.0
1,675.0 1675.0
1,663 1663.0
4,644 4644.0
1,615 1615.0
1,747 1747.0
1.853 1853.0
2,043.0 2043.0
1,710 1710.0
1,900 1900.0
1,639 1639.0
1,710 1710.0
1,544 1544.0
1,734 1734.0
1,758 1768.0
1,876 1876.0
1,758 1758.0
Results
Std Dev.
512.5511
Mean
1851.8889
C.V.
0.2768
n
36
Mull Factor = 1.3700
Max. Value 4644.0
Max Fred Gw 6362.3
npdes rpa 2004031 nc0083909a, data
- 1 - 3/12/2009

REASONABLE POTENTIAL ANALYSIS
1
2
3
4
5
6
7
8
9
10
11
12
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
64
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
Cadmium I Chromium I
Date
Data
BDL=112DL
Apr-2008
'<
10
5.0
Jan-2008
<
10
5.0
Oct-2007
<
10
5.0
Jul-2007
-.
10
10.0
Apr-2007
10
10.0
Jan-2007
10
10.0
Oct-2006
1
1.0
Jul-2006
5
5.0
Apr-2006
1
1.00
Jan-2006
1
1.00
Oct-2005
1
1.00
Jul-2005
1
1.00
Results
Std Dev.
3.7285
Mean
4.5833
C.V.
0.8135
n
12
Mult Factor = 3.7500
Max Value 10.0
Max. Pred Cw 37.5
Date
Apr-2008
Jan-2008
Oct-2007
Jul-2007
Apr-2007
Jan-2007
OCh2060
Jul-2006
Apr-2006
Jan-2006
Oct-2005
Jul-2005
Data
<
BDL=I2DL
50 26.0
60 60.0
50 25.0
50 50.0
50 50.0
50 50.0
5 5.0
5 5.0
5.0 5.0
5.0 5.0
5.0 5.0
25.0 25.0
Results
Std Dev.
21,5146
Mean
25,8333
C.V.
0.8328
n
12
Mult Factor = 3.8500
Max. Value 60.0
Max Pred Cw 231.0
npdes rpa 2004031 nc0083909a, data
- 4 - 3/12/2009

REASONABLE POTENTIAL ANALYSIS
Date Data
Jun-2008 -<
May-2008 <
Apr-2008 <
Mar-2008 <
Feb-2008
Jan-2008 <
Dec-2007 =;<
Nov-2007 <
Oct-2007 -<
Sep-2007 >
Aug-2007 :<
Jul-2007
Jun-2007
May-2007
Apr-2007
Mar-2007
Feb-2007
Jan-2007 e=
Dec-2006
Nov-2006
Oct-2006
Sep-2006
Aug-2006
Jul-2006
Jun-2006
May-2006
Apr-2006
Mar-2006
Feb-2006
Jan-2006
Dec-2005
Nov-2005
Oct-2005
Sep-2005
Aug-2005
Jul-2005 F
Copper I Cyanide
BDL=1/2DL
25.0
25.0
25.0
25.0
25.0
25.0
25.0
25.0
25.0
60.0
25.0
50.0
50.0
50.0
50.0
50.0
50.0
50.0
2.0
20.0
5.0
50.0
5.0
7.0
53.0
5.0
5.0
5.0
9.0
5.0
5.0
5.0
5.0
5.0
5.0
33.0
Results
Stall Dev.
18.9764
Mean
24.6944
C.V.
0.7684
n
36
Mult Factor = 2.1900
Max. Value 60.0
Max. Fred Cw 131.4
Date
Apr-2008
Mar-2008
Jan-2008
Oct-2007
Jul-2007
Apr-2007
Jan-2007
OCt-2006
Jul-2006
Apr-2006
Jan-2006
Oct-2005
Jul-2005
Data
BDL=1/2DL
5 5.0
5 5.0
5 5.0
5 5.0
5 5.0
5 5.0
5 5.0
5 5.0
5 5.000
5 5.000
5 5.000
5 5.000
5 5.000
Results
Std Dev.
0.0000
Mean
5.0000
C.V.
0.0000
n
13
Mult Factor = 1.0000
Max. Value 5.0
Max. Fred Cw 5.0
npdes rpa 2004031 nc0083909a, data
- 7 - 3/12/2009

REASONABLE POTENTIAL ANALYSIS
I Fluoride I Lead I
Date
Data
BDL=I2DL
Results
Apr-2008
7100
7100.0
Std Dev.
1847.1108
Jan-2008
4600
4600.0
Mean
4850.0000
Oct-2007
900
900.0
C.V.
0.3808
Jul-2007
3100
3100.0
n
12
Apr-2007
3600
3600.0
Jan-2007
4100
4100.0
Mutt Factor =
1.9800
Oct-2006
6700
6700.0
Max. Value
7100.0
Jul-2006
5100
5100.0
Max Pred Cw
14058.0
Apr-2006
6,000
6000.0
Jan-2006
3,900
3900.0
Oct-2005
6,800
6800.0
Jul-2005
6,300
6300.0
Date
Data
BDL=I2DL
Results
1 Apr-2008
50
25.0
Std Dev.
53.2327
2 Jan-2008
192
192.0
Mean
25.0833
3 Oct-2007
< 50
25.0
C.V.
2.1222
4 Jul-2007
20
20.0
n
12
5 Apr-2007
3
3.0
6 Jan-2007
3
3.0
Mutt Factor =
11.2700
7 Oct-2006
r 5
5.0
Max. Value
192.0
8 Jul-2006
5
5.0
Max Pred Cw
2163.8
9 Apr-2006
5
5.0
10 Jan-2006
5
5.0
11 Oct-2005
5
5.0
12 Jul-2005
8
8.0
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
59
60
61
62
63
64
65
66
67
68
69
npdes rpa 2004031 nc0083909a, data
10 - 311=009

REASONABLE POTENTIAL ANALYSIS
I Mercury I Iron
Date
Apr-2008
Jan-2008
Oct-2007
Jul-2007
Apr-2007
Jan-2007
Oct-2006
Jul-2006
Apr-2006
Jan-2006
Oct-2005
Jul-2005
Data
BDL=1/2DL
<
200
100.0
<
200
100.0
<
200
100.0
200
100.0
200 200.0
200 200.0
200 200.0
200 200.0
200.0 200.0
200.0 200.0
200.0 200.0
200.0 200.0
Results
Sid Dev.
49.2366
Mean
166.6667
C.V.
0.2964
n
12
Mult Factor = 1.71
Max. Value 200.0
Max. Fred Cw 342.0
Date
Data
BDL-1/2DL
Results
1
Apr-2008
75
75.0
Sid Dev.
85.36
2
Jan-2008
122
122.0
Mean
118.83
3
Oct-2007
90
90.0
C.V.
0.72
4
Jul-2007
149
149.0
n
12
5
Apr-2007
112
112.0
6
Jan-2007
81
81.0
Mult Factor =
3.3100
7
Oct-2006
114
114.0
Max. Value
356.0
6
Jul-2006
5
5.0
Max. Fred Cw
1178.4
9
Apr-2006
167.0
167.0
10
Jan-2006
74.0
74.0
11
Oct-2005
8L0
81.0
12
Jul-2005
'.
356.0
356.0
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
60
51
52
53
64
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
npdes rpa 2004031 nc0083909a. data
13 - 3/12/2009

REASONABLE POTENTIAL ANALYSIS
Date
Data
BDL=1/2DL
Results
Apr-2008
<
50
25.0
Sid Dev.
18.6619
Jan-2008
<
50
25.0
Mean
22.4167
Oct-2007
50
25.0
C.V.
0.8325
Jul-2007
50
50.0
n
12
Apr-2007
-
50
50.0
Jan-2007
50
50.0
Mull Factor =
3.8400
Oct-2006
5
5.0
Max. Value
50.0
Jul-2006
_
s
5
5.0
Max. Pred Cw
192.0
Apr-2006
z
5
5.0
Jan-2006
_
5
5.0
Oct-2005
�'
5
5.0
Jul-2005
19
19.0
Date Data
BDL-1/2DL Results
1
Std Dev.
NO DATA
2
Mean
NO DATA
3
C.V.
NO DATA
4
n
0
5
6
Mull Factor=
N/A
7
Max. Value
0.0
8
Max. Pred Cw
WA
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
a
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
59
60
61
62
63
64
65
66
67
68
69
npdes rpa 2004031 nc0083909a, data
16 - 3/12/2009

REASONABLE POTENTIAL ANALYSIS
Selenium
Silver
Date
Data
BDL=1/2DL
Results
Date
Data
BDL=1/2DL
Results
1
Jun-2008
;<
5
2.5
Std Dev.
5.5566
1
Apr-2008
<
50
25.0
Std Dev.
17.0727
2
Jun-2008
'"
6
6.0
Mean
5.0347
2
Jan-2008
<
50
25.0
Mean
18.7500
3
May-2008
5
2.5
C.V.
1.1037
3
Oct-2007
<
50
25.0
C.V.
0,9105
4
May-2008
_<
<
5
2.5
n
72
4
Jul-2007
50
50.0
n
12
5
Apr-2008
sz
5
2.5
5
Apr-2007
50
50.0
6
Apr-2008
';<
5
2.5
Mull Factor =
2.0200
6
Jan-2007
20
20.0
Mull Factor =
4.2300
7
Mar-2008
' <
5
2.5
Max. Value
50.0 ug/L
7
Oct-2006
5
5.0
Max. Value
50.0 ug4
8
Mar-2008
<.
5
2.5
Max. Pred Cw
101.0 ug/L
8
Jul-2006
5
5.0
Max. Pred Cw
211.5 ug/L
9
Feb-2008
r<
5
2.5
9
Apr-2006
5
5.0
10
Feb-2008
l<
5
2.5
10
Jan-2006
5
5.0
11
Jan-2008
<
5
2.5
11
Oct-2005
5
5.0
12
Jan-2008
e
5
2.5
12
Jul-2005
_
5
5.0
13
Dec-2007
5
2.5
13
14
Dec-2007
<
5
2.5
14
15
Nov-2007
<
5
2.5
15
16
Nov-2007
5
2.5
16
17
Oct-2007
<
5
2.6
17
18
W-2007
<-
5
2.5
18
19
Sep-2007
<
5
2.5
19
20
Sep-2007
<
5
2.5
20
21
Aug-2007
<
5
2.5
21
22
Aug-2007
.<
5
2.5
22
23
Jul-2007
5
5.0
23
24
Jul-2007
5
5.0
24
25
Jun-2007
50
50.0
25
26
Jun-2007
10
10.0
26
27
May-2007
5
5.0
27
28
May-2007
-,.
6
6.0
28
29
Apr-2007
-
5
5.0
29
30
Apr-2007
5
5.0
30
31
Mar-2007
a
5
5.0
31
32
Mar-2007
5
5.0
32
33
Feb-2007
€
5
5.0
33
34
Feb-2007
5
5.0
34
35
Jan-2007
8
8.0
35
36
Jan-2007
`
5
5.0
36
37
Dec-2006
5
5.0
37
38
Dec-2006
5
5.0
38
39
Nov-2006
5
5.0
39
40
Nov-2006
5
5.0
40
41
Oct-2006
5
5.0
41
42
Oct-2006
5
5.0
42
43
Sep-2006
5
5.0
43
_
44
Sep-2006
5
5.0
44
45
Aug-2006
5
5.0
45
46
Aug-2006
5
5.0
46
47
Jul-2006
?
5
5.0
47
48
Jul-2006
5
5.0
48
49
Jun-20t16
5
5.0
49
50
Jun-2006
;.
5
5.0
50
51
May-2006
'....
5
5.0
51
52
May-2006
5
5.0
52
s'
53
Apr-2006
5
5.0
53
-
54
Apr-2006
+.
5
5.0
54
55
Mar-2006
5
5.0
55
56
Mar-2006
5
5.0
56
57
Feb-2006
5
5.0
57
58
Feb-2006
5
5.0
68
59
Jan-2006
5
5.0
59
60
Jan-2006
5
5.0
60
61
Dec-2005
5
5.0
61
62
Dec-2005
5
5.0
62
63
Nov-2005
5
5.0
63
64
Nov-2005
..
5
5.0
64
65
Ocb2005
5
5.0
65
66
Och2005
-
5
5.0
66
67
Sep-2005
5
5.0
67
68
Sep-2005
5
5.0
68
69
Aug-2005
5
5.0
69
npdes rpa 2004031 nc0083909a, data
19- 3/12/2009

REASONABLE POTENTIAL ANALYSIS
70 Aug -ZOOS
71 Jul-2005
72 Jul-2005
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
5.0
5.0
5.0
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
20 -
npdes rya 2004031 nc0083909a, data
3/12/2009

REASONABLE POTENTIAL ANALYSIS
1
2
3
4
5
6
7
8
9
10
11
12
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
59
60
61
62
63
64
65
66
67
68
69
Date
Data
BDL=II2DL
Results
Jun-2008
<.
50
25.0
Std Dev.
51.2691
May-2008
<
50
25.0
Mean
35.1389
Apr-2008
<
50
25.0
C.V.
1.4590
Mar-2008
<
50
25.0
n
36
Feb-2008
<
50
25.0
Jan-2008
<
50
25.0
Mult Factor =
3.4200
Dec-2007
<
50
25.0
Max. Value
289.0
Nov-2007
<
50
25.0
Max. Pred Cw
988.4
Oct-2007
<:
50
25.0
Sep-2008-z
50
25.0
Aug-2007
<.
50
25.0
Jul-2007
50
50.0
Jun-2007
50
50.0
May-2007
50
50.0
Apr-2007
50
50.0
Mar-2007
100
100.0
Feb-2007
50
50.0
Jan-2007
50
50.0
Dec-2006
5
5.0
Nov-2006
50
50.0
Oct-2006
8
8.0
Sep-2006
`.
50
50.0
Aug-2006
5
5A
Jul-2006
289
289.0
Jun-2006
'=
5
5.0
May-2006
!
5
5.0
Apr-2006
5
5.0
Mar-2006
5
5.0
Feb-2006
5
5.0
Jan-2006
5
5.0
Dec-2005
5
5.0
Nov-2005
r
5
5.0
Oct-2005"
8
8.0
Sep-2005
5
5.0
Aug-2005
s
5
5.0
Jul-2005
_
125
125.0
22 -
npdes rpa 2004031 nc0083909a, data
3/1212009

COUNTY OF DARE
Water Department
600 Mustian Street, Kill Devil Hills, NC 27948
North Reverse Osmosis
Treatment Facility
June 7, 2007
[phone]
fax [phone]
J U U 2 1 2007
Mrs. Carolyn Bryant L-
NC DENR/DWQ/Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: NPDES Permit Renewal
NCO083909
Rodanthe/Waves/Salvo Reverse Osmosis WTP
Dare County
Dear Mrs. Bryant:
The NPDES permit for the Rodanthe/Waves/Salvo Reverse Osmosis WTP (RWS)
expires on December 31, 2007. As required, we are forwarding a renewal application
package for the facility requesting renewal of the NPDES permit. The renewal package
includes: this cover letter; a completed application form (Short Form C-WTP); a Solids
Handling Plan, and; a schematic of flow through the facilities. There have been no
changes to the wastewater characteristics or treatment since the issuance of the current
permit. Two copies of the renewal package are also enclosed.
The current NPDES permit for RWS was issued effective September 1, 2003. This was
prior to the implementation of DWQ's guidance document "PERMITTING STRATEGY
FOR REVERSE OSMOSIS AND ION EXCHANGE WTPs". The plant is currently
monitoring nine pollutants that are not listed in Appendix A of the Strategy as the
minimum monitoring/limit requirements. We are requesting that these pollutants be
removed as monitoring requirements from the permit. The pollutants are: total
suspended solids, total selenium, total cyanide, total cadmium, total chromium, total lead,
total mercury, total nickel, and total silver. The testing results for all the metals have
been either below detection levels or below water quality standards.
The following parameters are in the current permit and also listed in Appendix A of the
Strategy as minimum monitoring requirements. Based on monitoring results, we request
the following changes be considered:
- Total Dissolved Solids (TDS): Remove from monitoring requirement. Generally,
TDS can be used as an indicator of potential toxicity. The plant has passed all
toxicity testing during the permit cycle.

Temperature: Remove from monitoring requirement for effluent, upstream, and
downstream samples. The discharge flow is from a groundwater well and has
only minor temperature variations. The receiving waters have not been impacted
by the temperature of the discharge.
Salinity: Remove from monitoring requirement for effluent, upstream, and
downstream samples. The salinity of the discharge is approximately 1/3 of the
upstream salinity values. There is very little change between upstream and
downstream salinity values.
Dissolved Oxygen (DO): Remove from monitoring requirement for effluent,
upstream, and downstream samples. A comparison of the upstream and
downstream DO values show little to no change indicating no impact of the
discharge to the receiving waters.
- Conductivity: Remove from monitoring requirement for effluent, upstream, and
downstream samples. The effluent conductivity is averages approximately 1/3 of
the upstream conductivity. A comparison of the upstream and downstream
conductivity values show little to no change between the values.
It is requested that the Division reevaluate the need for the nutrient/ammonia
monitoring. The total phosphorous, total nitrogen and ammonia nitrogen levels in
the wastewater discharge have remained fairly constant over the last few years.
Given the low discharge flow and the location of the receiving waters, the total
pounds of nutrients being added should have negligible impact on water quality.
Total Copper: Remove as a monitoring requirement. A review of the lab results
indicate that copper levels are generally below detection levels. A higher copper
result was reported for June 2006, but a review of the lab reports shows that the
reported number of 0.530 should have been a 0.053. The plant is passing all of its
toxicity tests which indicates that copper in the effluent is not a problem.
Total Arsenic: Remove as a monitoring requirement. All lab results have been
less than detection (<5 ug/L).
Total Iron: Remove as a monitoring requirement. Effluent iron levels are below
the freshwater action level.
Total Zinc: Remove as a monitoring requirement. All lab results have been
below detection levels or below the water quality standard.
Acute Toxicity: Remove as a monitoring requirement. There have been no
failures of the toxicity tests in the past four years.
We realize that we are requesting a significant reduction in the facility's monitoring
requirements. We feel that a reduction is justified based upon past monitoring results,
lack of impact on the receiving waters, and the amount of dilution provided by the
receiving waters for what is basically a potable water discharge.
If you have any questions or comments, please call Ken Flatt, Utilities Director, at
252/475-5606.
Sincerely,
r1ro:01"/L mot/ L--
Terry Wheeler, Manager
Dare County

Sludge Management Plan
Rodanthe/Waves/Salvo Reverse Osmosis WTP
NPDES NC0083909
The discharge from this facility is the reject water from a reverse osmosis water treatment
plant. The reject water flow receives no treatment and no sludge is generated or
removed.
Sincerely,
Terry Wheeler, Manager
Dare County

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FACT SHEET FOR EXPEDITED PERMIT RENEWALS
Basic Information to determine potential for expedited permit renewal
Reviewer/Date
cil Vi z Q K ; 7- l 1- o7
Permit Number
/VC d083gv
Facility Name
doofke GJ4WS 54? t vv IUlr
Basin Name/Sub-basin number
3 of 55
Receiving Stream
Stream Classification in Permit
5 - t1QUJ
Does permit need NH3 limits?
N
Doespen-nit need TRC limits?
j e S i -( C f .040 4r drw KvfeE
Does permit have toxicity testing?
YE S
Does permit have Special Conditions?
,V
Does permit have instream monitoring?
Ye s
Is the stream impaired on 303 d list)?
N o
Any obvious compliance concerns?
Al 0
Any permit mods since lastpermit?
/v O
Existing expiration date
12 - 3/- 0 7
New expiration date
/2 - 31- I a
New pit effective date
f - /-o 0
Miscellaneous Comments
e
YES_ This is a SIMPLE EXPEDITED permit renewal (administrative
renewal with no changes, or only minor changes such as TRC, NH3,
name/ownership changes). Include conventional WTPs in this group.
YES_ This is a MORE COMPLEX EXPEDITED permit renewal (includes
Special Conditions (such as EAA, Wastewater Management Plan), 303(d)
listed, toxicity testing, instream monitoring, compliance concerns, phased
limits). Basin Coordinator to make case -by -case decision.
NO 1/ This permit CANNOT BE EXPEDITED for one of the following reasons:
• Major Facility (municipal/industrial)
• Minor Municipals with pretreatment program
• Minor Industrials subject to Fed Effluent Guidelines (lb/day limits for BOD, TSS,
etc)
• Limits based on reasonable potential analysis (metals, GW remediation organics)
• Permitted flow > 0.5 MGD (requires full Fact Sheet)
• Permits determined by Basin Coordinator to be outside expedited process
TB Version 8/18/2006 (NPDES Server/Current Versions/Expedited Fact Sheet)