NC0085707_technical Correction_20041108

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
November 8, 2004
Mr. John Contestable, Plant Superintendent
Dare County
600 Mustian Street
Kill Devil Hills, North Carolina 27948
Subject: Correction to NPDES Permit NCO085707
Cape Hatteras R.O. WTP
Dare County
Dear Mr. Contestable:
A review of the NPDES discharge permit for the above referenced facility has revealed an error in the
whole effluent toxicity testing requirement. The permit issued January 23, 2004 contained a whole effluent
toxicity limit. Division permitting strategy for reverse osmosis facilities calls for whole effluent toxicity
monitoring without a limit. As such, the appropriate changes have been made to conditions A(1) and A(2) of
the permit. These conditions are attached herein and should be inserted into the permit with the old
conditions discarded.
If you have any questions regarding this matter, please do not hesitate to contact Mark McIntire of
my staff at [phone], extension 508.
Sfncerel
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an W. Iffimek, P.E.
cc: Central Files
Washington Regional Office - Water Quality Section
Aquatic Toxicology Unit
NPDES Unit
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North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Intemet h2o.enr.state.nc.us 512 N. Salisbury St. Raleigh, NC 27604 FAX [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycled110% Post Consumer Paper

Permit NCO085707
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on March 1, 2004 and lasting until expiration, the Permittee is authorized to
discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified
below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample Location'
Flow
1.8 MGD
Continuous
Recording
Effluent
Total Suspended Solids
20.0 m L
30.0 m L
Weekly
Grab
Effluent
Settleable Solids
0.1 mill.
0.2 mVL
Weekly
Grab
Effluent
Total Dissolved Solids
Month
Grab
Effluent
NZ
Weekly
Grab
Effluent
H
?/Month
Grab
Upstream, Downstream3
Temperature
2/Month
Grab
Effluent,
U stream, Downstream3
Dissolved Oxygen
21Month
Grab
Effluent,
U stream, Downstream3
Conductivity
21Month
Grab
Effluent,
U stream, Downstream3
Salinity
2/Month
Grab
Effluent,
Upstream, Downstream3
Ammonia Nitrogen
21Month
Grab
Effluent
Total Nitrogen
21Month
Grab
Effluent
Total Phosphorus
21Month
Grab
Effluent
Chloride
2/Month
Grab
Effluent
Total Copper
2/Month
Grab
Effluent
Total Fluoride
2/Month
Grab
Effluent
Total Iron
2/Month
Grab
Effluent
Total Silver
2/Month
Grab
Effluent
Total Zinc
21Month
Grab
Effluent
Total Chromium
Monthly
Grab I
Effluent
Total Nickel
Monthly
Grab
Effluent
Total Selenium
Quarterly I
Grab
Effluent
Chronic ToxjCItV4
Quarterly I
Grab
Effluent
Notes:
1 Samples shall be collected at some point after all treatment units and prior to discharge, unless
otherwise noted.
2 The pH shall not be less than 6.8 standard units nor greater than 8.5 standard units.
3 Upstream = 50 feet north of the outfall, Downstream = 50 feet south of the outfall.
4 Chronic Toxicity Monitoring (Mysidopsis bahic) ® 6.5%, during the months of January, April,
July, and October. See Part I, Condition A. (2.). The collection of samples shall coincide with the
sampling of other parameters.
There shall be no discharge of floating solids or visible foam in other than trace
amounts

NPDES Permit No. NCO085707
A. (2.) CHRONIC TOXICITY MONITORING (QUARTERLY)
The permittee shall performguarterlchronic toxicity monitoring using procedures described below to
establish compliance with the permit condition. The effluent concentration is 6.5%. The tests will be
performed during the months of January, April, July, and October. Effluent sampling for this testing shall
be performed at the NPDES permitted final effluent discharge below all treatment processes.
The toxicity test procedure will be based on EPA Method 1007.0, Mysidopsis bahia, Survival, Growth, and
Fecundity Test, as described in Short -Tenn Methods for Estimating the Chronic Toxicity of Effluents and
Receiving Waters to Marine and Estuarine Organisms, Second Edition, EPA 600-4-91-003, July 1994. The
procedure will be performed as written with the following exceptions:
➢ Mortality will be evaluated using the t test described on page 91 in Methods for Measuring the
Acute Toxicity of Effluents to Freshwater and Marine Organisms, Fourth Edition, EPA/600/4-
90/027, September 1991, applying an alpha level of 0.05.
➢ The growth endpoint will be determined using Appendix G of Short -Tenn Methods for Estimating
the Chronic Toxicity of Effluents and Receiving Waters to Marine and Estuarine Organisms,
Second Edition, EPA 600/4-91 /003, July 1994, applying an alpha level of 0.01.
➢ The test will be performed at 20 ppt salinity.
➢ Fecundity will not be evaluated.
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 TGP3E.
Additionally, DWQ Form AT-4 (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 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. 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, minimum control organism reproduction, 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: [Fwd: Cape Hatteras Water Association, Inc. WTP-NCO0857071
Subject: Re: [Fwd: Cape Hatteras Water Association, Inc. WTP-NC0085707]
From: Matt Matthews <[e-mail]>
Date: Tue, 14 Sep 2004 11:05:25 -0400
To: Mark McIntire <[e-mail]>, Kevin Bowden <[e-mail]>
Mark,
Thanks for following up. To my knowledge, this has not been resolved.
Mark McIntire wrote:
Matt,
Trying to get caught up. Did this one ever get resolved?
Thanks,
Mark
Matt Matthews wrote:
Dave tells me that he passed this issue on to either Mark or Susan, or that Charles might know who
ended up with it.
Can someone contact me to get this cleared up?
Thanks.
Subject:
Cape Hatteras Water Association, Inc. WTP-NC0085707
From:
Matt Matthews <matt.matthews(@ncmail.net>
Date:
. Tue, 30 Dec 2003 14:47:27 -0500
To: Dave Goodrich <Dave.GoodrichAncmail.net>
Dave,
In reviewing RO facilities currently discharging, we recently noted that this facility has an acute limit.
Additionally, based on the August 20th draft permit, they're set to receive a chronic limit (mysid) at
6.5%.
Their initial 9/1/96 permit had a pass/fad monitoring requirement. Their subsequent/current permit
(11/1/99) was issued with a pass/fail acute limit based on the RO permitting policy at that time.
My question is, based on our most recent RO reject water discharger permitting guidelines, should we
issue them a "monitoring without a limit" requirement rather than a limit? Would that be "backsliding"?
1 of 2 9/23/2004 9:05 AM
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