NC0086584_Permit Modification_20000107 (2)

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
January 7, 2000
Mr.'rim M. Johnson
Town Manager
P.O. Box 220
Belhaven, North Carolina 27810
WA
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NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOUROEs
Subject: NPDES Permit Modification
NPDES Permit NCO086584
Belhaven WWTP
Beaufort County
Dear Mr. Johnson:
Personnel in the Division's Aquatic Toxicology Unit conducted a review of the permit file for your
facility. The review noted a typographical error in the instructions for toxicity monitoring on the A. (2.)
page of your permit. This permit modification corrects the typographical error.
Please find enclosed the revised permit page. This page should be inserted into your permit. The
old page may then be discarded. All other terms and conditions contained in the original permit
remain unchanged and in full effect. This permit modification is issued under the requirements of
North Carolina General Statutes 143-215.1 and the Memorandum of Agreement between North
Carolina and the U. S. Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit
modification 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 a written petition
conforming to Chapter 150B of the North Carolina General Statutes, 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.
If you have any questions concerning these permit modifications, please contact Charles Weaver
at [phone], extension 511.
cc: Central Files
Washington Regional Office, Water Quality Section
Point Source Compliance Enforcement Unit
NPDES Unit
Aquatic Toxicology Unit
1617 Mail Service Center, Raleigh, With Carolina 27699-1617
An Equal Opportunity Affirmative Action Employer
Sincerely,
t-werr T. Stevens
Telephone [phone] FAX [phone]
VISIT US ON THE INTERNET @ http'1Ih2o.encstate.nc.us/NPDES

Permit NCO086584
A. (2). ACUTE TOXICITY PASS/FAIL 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 Mysid shrimp (Mysidopsis bahia) 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 &
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: NC DENR / DWQ
Environmental Sciences Branch
1621 Mail Service Center
Raleigh, North Carolina 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 single test is passed. Upon passing, this
monthly test requirement will revert to quarterly in the months specified 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.
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.

DIVISION OF WATER QUALITY
December 23, 1999
MEMORANDUM
TO: Dave Goodrich
THROUGH: Matt Matthews M 0`
FROM: Kristie Robeson 0 -
SUBJECT: Permit Modification
Belhaven WTP
NPDES Permit No. NC0086584
Beaufort County
By cover letter dated November 12, 1999, the subject facility was issued NPDES
Permit No. NC0086584 with an effective date of December 1, 1999 and expiration date
of November 30, 2004. Review of this permit shows that Condition A(2) permits this
facility for an acute pass/fail monitoring requirement. However, a paragraph was added
in this condition page that is for facilities that are permitted for a toxicity limit. Our office
requests that this permit be modified to remove the sixth paragraph which states, "should
any single quarterly monitoring indicate a failure to meet specified limits, then monthly
monitoring will begin...."
Our office appreciates your assistance to undertake the necessary steps to modify
the existing permit and incorporate the recommendation cited above. Should you have
any questions, please feel free to contact me at 733-2136.
cc: Washington Regional Office
Aquatic Toxicology Unit Files
Shannon Langley -Point Source Compliance/Enforcement Unit
Central Files