NC0026247_Permit (Modification)_19900328

NPDES DOCUHENT SCANNING COVER :SHEET
NC0026247
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Correspondence
Speculative Limits
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(67b)
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Document Date:
March 28, 1990
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State of North Carolina
Department of Natural Resources and Community Development
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor
William W. Cobey, Jr., Secretary
Mr. David R. Keasey
Unocal Refining & Marketing Division
Unocal Corporation
PO Box 4147
Atlanta, Georgia 30302
March 28, 1990
TES;
George T. Everett, Ph. D.
Director
Vr rt'ge irk
MAR 2 71990
Subject: Modifition to NPDES
Permit No. NC0026247
Unocal Corporation -Greensboro
Guilford County
Dear Mr. Keasey:
The Division of Environmental Management is forwarding herewith a modification to the
subject permit. This modification is to replace the 48-hour LC50 Ceriodaphnia toxicity
requirement with a 24-hour LC50 Fathead Minnow toxicity requirement since this latter toxicity
test is more appropriate for facilities of the subject type which have infrequent and relatively small
discharges.
A revised Part III, Condition G is attached and should be inserted into your NPDES
permit. Please discard the old Part III, Condition G.
All other terms and conditions contained in the original permit remain unchanged and in full
effect. This modification 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 December 6, 1983. This permit modification becomes
effective immediately.
If this decision is 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, Post Office Drawer 11666, Raleigh, North
Carolina, 27604. Unless such a demand is made, this decision shall be final and binding.
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer
i

If you have any questions concerning this permit, please contact Mr. Dale Overcash at
telephone number [phone].
Sincerely,
George T. Everett
Enclosure
cc: Central Files
Winston-Salem Regional Office
.117h7116g. Support Branch
Mr. Jim Patrick, EPA

Part III Permit No. NC0026247
G. ACUTE TOXICITY TESTING REQUIREMENT
Fathead Minnow 24 hr - Monitoring (Annual) for Episodic Events
The permittee shall conduct FIVE acute toxicity tests using protocols defined
in E.P.A. Document 600/4-85/013 entitled "The Acute Toxicity of Effluents to
Freshwater and Marine Organisms". The monitoring shall be performed as a
Fathead Minnow (Pimephales promelas) 24 hour static test, using effluent
collected as a single grab sample. Effluent samples for self -monitoring
purposes must be obtained below all waste treatment. Sampling and subsequent
testing will occur during the first five discrete discharge events after the
effective date of this permit. After monitoring of the first five toxicity
tests, the permittee will conduct one test annually, with the annual period
beginning in January of the next calendar year. The annual test requirement
must be performed and reported by June 30. If no discharge occurs by June 30,
notification will be made to the Division by this date. Toxicity testing will
be performed on the next discharge event for the annual test requirement.
The parameter code for this test is TAE6C. 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, DEM Form AT-1 (original) is to be
sent to the following address:
Attention:
Environmental Sciences Branch
North Carolina Division of
Environmental Management
P.O. Box 27687
Raleigh, N.C. 27611
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 any test data from either these monitoring requirements or tests
performed by the North Carolina Division of Environmental Management indicate
potential impacts to the receiving stream, this permit may be reopened 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. Failure to submit suitable test
results will constitute noncompliance with monitoring requirements.

CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Certified No.
P 095 425 894
Dear Mr. Eagleson:
UNOCAL
March 9, 1990
Unocal Refining & Marketing Division
Unocal Corporation
P.O. Box 4147 ,S
Atlanta, Georgia 30302 ,l
Telephone [phone]
F.
::.ir .% aJ 0
North Carolina Department of Environment, Health, and
Natural Resources
Division of Environmental Management
512 North Salisbury Street
Raleigh, North Carolina 27611
Attn: Mr. Ken W. Eagleson
Assistant Water Quality Section Chief
REVISION OF BIOMONITORING REQUIREMENTS
Southeast Terminal (Charlotte)
NPDES No. NC0021971, Mecklenburg County
Southeast Terminal (Greensboro)
NPDES No. NC0026247, Guilford County
I am writing to confirm that the biomonitoring requirements contained in the NPDES
permits for the subject facilities are to modified.
During a recent telephone conversation with your office I was informed that the current
monitoring protocol, which specifies a 48-hour LC50 determination using Ceriodaphnia
dubia as the test organism, is not now considered an appropriate test method. It was
indicated that this test is now considered inappropriate for facilities which have only
infrequent and relatively small discharges.
The monitoring requirement that was considered to be more appropriate was cited as a 24-
hour LC50 test utilizing Fathead Minnows (Pitnephales proinelas) as the test species. It was
indicated that we should proceed with the use of the new biomonitoring procedure for
future testing, and that the NPDES permits for both of the facilities in question would be
modified.
Unocal is to change the biomonitoring program at the Greensboro and Charlotte Southeast
Terminals. At each facility we will arrange to have five sequential discharges tested with
the new procedure, and will continue with annual biomonitoring thereafter.
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rAck 4-7
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I was advised during the telephone conversation that the NPDES permits for the subject
facilities would be modified to show the changes described above, and that Unocal could
proceed immediately to implement the changes. If there is any reason that we should wait
to make the monitoring changes, please let me know as soon as possible. Unless we are
advised otherwise, we will proceed with the new monitoring program.
If you require additional information, please do not hesitate to call me at [phone].
Very truly yours,
..- ,
David R. Keasey
Manager
Marketing Environmental
DRK/bmc
cc: R. E. Van Deusen
C. E. Wells
S. B. Guin