NC0085553_technical correction_20090708

of \NATF'Q Michael F. Easley, Governor
Q State of North Carolina
0 Alan W. Klimek, P.E., Director
William G. Ross, Jr., Secretary
Gq t— Department of Environment and Natural Resources
7 y
Division of Water Quality
July 8, 2009
Mr. Kennith D. Bowling
Village Utility Director
P. O. Box 3009
Bald Head Island, North Carolina 28461
Subject: NPDES Permit Revision
Permit NCO08555.3
Village of Bald Head
Island Utilities Dept.
WTP
Brunswick County
Dear Mr. Bowling:
A recent review of your NPDES discharge permit revealed that the
wrong Whole Effluent Toxicity Testing language was used. The Aquatic
Toxicity unit has requested that we revise the language to require monitoring
only, without a limit. They also recommend using fathead minnows for the
test organism.
Attached are revised copies of sheet A. (1.) Effluent Limitations and
Monitoring Requirements, and A. (2.) Acute Toxicity Monitoring (Quarterly)
for your permit. Please replace the current pages with the new pages.
If you have any questions or need additional information, please
contact Jim McKay of my staff at [phone], or email at
[e-mail].
Sincerely,
Jeff Poupart
Supervisor of Point Source
Branch
cc: Central Files
Wilmington Regional Office/ Surface Water Protection ( via ema/I)
NPDES Unit Files
Aquatic Toxicology, attn: Susan Meadows ( via email)
North Carolina Division of Water Quality [phone], Ext.363
1617 Mail Service Center FAX [phone]
Raleigh, North Carolina 27699-1617 On the Internet at http://h2o.enr.state.nc.us/

Permit NCO085553
A. (2.) ACUTE TOXICITY MONITORING (QUARTERLY)
The permittee shall conduct acute toxicity tests on a quarterly 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 Fathead Minnow
(Pimephales promelas) 24 hour static test. The effluent concentration at which there may
be at no time significant acute mortality is 90% (defined as treatment two in the
procedure document). 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.
The parameter code for P/mepha/es promelas is TGE6C. All toxicity testing results
required as part of this permit condition will be entered on the Effluent Discharge Form
(MR-1) for the month in which it was performed, using the appropriate parameter code.
Additionally, DWQ Form AT-2 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Quality
Environmental Sciences Section
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 any month, 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 any test data from either these monitoring requirements 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 Form 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.

Permit NCO085553
A. (1.) 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 reverse osmosis reject water from outfall 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
�.a��K �ia
LU.E k R.�
h 3Y ��i.`.rc..&,'w �Jtl
f : 11 ,r >
w , fLI FITS/E �y` r
~ wT .L,1i
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:i r NG'RE Ul EMENTS A`tr
s } . ,ON IT h». e, - Q
R� R C(/�' .,
C ARA <� Eli wI V
,7-Yi.{ T.^'l 1„ .�y +.s ��o+s z.,..d.?
t:Jv..
't.a cz. ..5:- , +- ]�... :�.. • .,rf .ai+ v u _ r ', /.
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1�rlt{ ° �1
r
r.^.I! c, ,.. ..-. r. f n: r.<. .^..r �1:. I
Moth"1= w . D�iaY'�;; .
�-..w 1tiw•.*R�_._."47a'. t rrss ��-.^_ <,� r �:F.i'yu::,{',r.i zy ;:;s,j s,ti,�v.4
Measreme�Sam ; le. 'Sa le Location?
rnI�`
,� ? �VJyy+._
Auera:ge Maximum
HE � � � �'TYP
Flow
0.087 MGD
Weekly
Instantaneo
Effluent
us
Temperature OfMonthly
Grab
E, U, D1
Salinity
Monthly
Grab
E, U, D
Conductivity
Monthly
Grab
E, U, D
pH2 --
Monthly
Grab
E, U, D
Dissolved Oxygen 0
Monthly
Grab
E, U, D
Total Dissolved
Monthly
Grab
Effluent
Solids
Total Arsenic
000,Monthly
Grab
Effluent
Total Copper
Monthly
Grab&
Effluent
Total Chloride
Monthly
Grab
Effluent
Total Iron
Monthly
Grab
Effluent
Total Zinc
Monthly
Grab
Effluent
Whole Effluent
Quarterly
Grab
Effluent
ToxiCity,3
Footnotes:
1. E is Effluent, U is at least 50 feet Upstream from the discharge location, D is at least 100 feet
Downstream of the discharge location.
2. The pH shall not be less than 6.8 standard units nor greater than 8.5 standard units.
3. Acute 24-hour Pass/ Fail, Fathead Minnow at 90%; January, April, July and October; refer to Special
Condition A (2).
All samples collected should be from a representative discharge event.
n
There shall be no discharge of floating solids or visible foam in other than trace amounts.