NC0004839_Permit (Issuance)_19960802

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NPDES DOCUMENT SCANNINS COVER SHEET
NPDES Permit: NC0004839
Document Type: Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Speculative Limits
Correspondence
Instream Assessment (f 7B)
Environmental Assessment (EA)
Permit
History
Document Date: August 2, 1996
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State of North Carolina
Department of Environment,
Health and Natural Resources 4 •
Division of Water Quality
James B. Hunt, Jr., Governor �A
Jonathan B. Howes, Secretary E H N
A. Preston Howard, Jr., P.E., Director
August 2, 1996
Mr. R.T. Harvin
Exxon Company
Charlotte Marketing Terminal
P.O. Box 82
Paw Creek, North Carolina 28130
Subject: NPDES Permit Issuance
Permit No. NCO004839
Exxon Oil Company
Mecklenburg County
Dear Mr. Harvin:
In accordance with the application for a discharge permit received January 29, 1996, the Division
is forwarding herewith the subject state - NPDES 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 US Environmental Protection Agency dated December 6, 1983.
This final permit has been prepared after a careful review of the comments received. In response
to Exxon's April 30, 1996 letter submitted by Mr. Michael E. Slemp, the term "washdown water" has
been added to the cover supplement sheet and the effluent sheet for outfall 001. Additional changes to the
effluent sheet for outfall 002 have been made to keep the permit consistent with other groundwater
remediation systems. These include the addition of a 30 mg/1 limit for Total Suspended Solids and the
modification from a limit to monitoring only for Oil and Grease.
In response to oil terminals' comments pertaining to the chlorophenol monitoring requirements in
the draft permits, the Division held a teleconference with representatives from the oil terminals and their
laboratories. The oil terminals' representatives had the following concerns: (1) Why was there a
requirement to monitor for eight individual chlorophenols in addition to those specified in EPA Method
625; and (2) What is the proper laboratory procedure to analyze for these eight chlorophenols?
After some additional data review, research, and discussion, two determinations were made.
First, although all chlorophenols have the potential to cause taste and odor problems in drinking water
supplies and tainting of fish tissue, the eight chlorophenols not covered by EPA Method 625 are not
considered to be carcinogens. Second, certain chlorophenolic compounds are likely to form first. This is
significant because certain parameters can be used to "screen" the stormwater discharge for the presence of
chlorophenols. Specifically, the five chlorophenols included in EPA Method 625 can be used as
indicators of all chlorophenols because these five compounds would be the first to form when chlorine
reacts with phenol.
Therefore, EPA Method 625 will be used as an initial screen. If no chlorophenols are detected, no
additional monitoring will be required. However, if one or more chlorophenols are detected at
concentrations greater than 50 µg/l, then the oil terminal would be required to monitor for the eight
additional chlorophenols beginning with the next scheduled monitoring'event and continue to monitor until
PA. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
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the permit expired. The additional chlorophenol monitoring would include identifying and quantifying all
chlorophenols present in the sample(s).
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, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such demand is
made, this decision shall be final and binding.
Please take notice this permit is not transferable. Part Il, EA. addresses the requirements to be
followed in case of change in ownership or control of this discharge.
This permit does not affect the legal requirements to obtain other permits which may be required
by the Division of Environmental Management or permits required by the Division of Land Resources,
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 Mr. Steve Pellei at telephone
number(919)733-5083, extension 516.
Sincerely,
original Signed BY
A. Preston Howard, Jr.
A. Preston Howard, Jr., P.E.
cc: Central Files
Mr. Roosevelt Childress, EPA
Mooresville Regional Office
(Permits and,Enginee_r_ing Unit
Mecklenburg County Environmental Protection
Facilities Assessment Unit
Aquatic Survey and Toxicology Unit
1

'S 1
Permit No. NCO004839
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, 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,
Exxon Company, U.S.A.
is hereby authorized to discharge wastewater from a facility located at
Charlotte Marketing Terminal
6801 Freedom Drive
Mecklenburg County
to receiving waters designated as an Unnamed Tributary to Long Creek in the Catawba River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I,
11, 111, and IV hereof.
The permit shall become effective September 1, 1996
This permit and the authorization to discharge shall expire at midnight on August 31; 2001
Signed this day August 2, 1996
original Signed BY
A. Preston, Howard, lr.
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

i
Permit No. NC0004839
SUPPLEMENT TO PERMIT COVER SHEET
Exxon Company, U. S. A.
is hereby authorized to:
1 . Continue to operate an oillwater separator and holding pond to treat stormwater and washdown
water discharging from outfal1001; and continue to operate a groundwater remediation system
consisting of an oil/water separator, an air stripper, and a carbon polishing unit to discharge
from outfall 002. Both outfalls are located at Charlotte Marketing Terminal, 6801 Freedom
Drive, Mecklenburg County (See Part III of this Permit), and
2. Discharge from said treatment works at the location specified on the attached map into an
unnamed tributary to Long Creek which is classified Class WS-IV waters in the Catawba River
Basin.

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ROAD CLASSIFICATION SCALE 1 :24 000
PRIMARY HIGHWAY LIGHT-DUTY ROAD,HARD OR 0 1 MILE
HARD SURFACE IMPROVED SURFACE
SECONDARY HIGHWAY 0 7000 FEET
HARD SURFACE _3 UNIMPROVED ROAD --
1 0 1 KILOMETER
Latitude °1 '4 " Longitude 80058'27" ..... PERES
Map # F15SW Sub-basin 030834 CONTOUR INTERVAL 10 FEET
Stream Class WS-IV 11.120-(2.5) 813/96 _ QUAD LOCATION
Discharge Class 100% Industrial Exxon/Charlotte Terminal
Receiving Stream Paw Creek/Catawba River NCO004839
Mecklenburg County
Design 0 0.057 MGDPermit expires 8/31/01 Fuel Terminal Facility

A. O. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Permit No. NCO04839
During the period beginning on the effective date oft perm' and lasting until expiration, the Permittee is authorized to discharge
stormwater and washwater from outfall(s) serial numb r 001. uch discharges shall be limited and monitored by the Permittee as
specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement Sample Sample
Monthly _AM. Weekly Avg. Daily Max. Frequency Type- Location
Flow '� Monthly t Effluent
Total Suspended Solids . 45.0 mg/l Monthly Grab Effluent
Oil and Grease2 y Monthly Grab Effluent
Phenol Monthly Grab Effluent
Benzene Monthly Grab Effluent
Xylene Semi-annually Grab Effluent
EPA Methods 624/6253 1 Semi-annually Grab Effluent
Acute Toxicity4 Annually Grab Effluent
Footnotes:
I Where no measurable discharge occurs, "no discharge" should be clearly noted on the submitted monthly discharge monitoring report.
Flow may be monitored in one of four ways: a) Measure flow continuously, b) Calculate flow based on the area draining to-the outfall, the built
upon area, and the total rainfall (this method of flow measurement should not be used at facilities that have large ponds to collect
surface water runoff), c) Estimate by flow measurement at 20 minute intervals during the entire discharge event, or d) Base flow on pump logs.
2 Where possible, the grab sample for oil and grease should be skimmed from the surface of a quiescent (calm water) zone.
3 EPA Method 625 includes five (5) chlorophenols. If one.or more chlorophenoI(s) is detected at concentrations greater than or equal to 50 µg/l, the
permittee will be required to analyze for the eight chlorophenols (listed below) in addition to EPA Method 625. This additional required monitoring
will begin with the permittee's next scheduled monitoring event, occur on a semi-annual basis, and will last for the duration of the permit. Eight
chlorophenols include the following: 3-chlorophenol, 4-chlorophenol, 2,3-dichlorophenol, 2,5-dichlorophenol, 2,6-dichlorophenol, 3,4-
dichiorophenol, 2,3,4,6-tetrachlorophenol, and 3-methyl-6-chlorophenol.
4 Acute Toxicity (Fathead Minnow, 24-hour) Monitoring, Annual, See Part III, Condition E.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
There shall be no direct discharge of tank solids, tank bottom water, or the rag layer.
There shall be no direct discharge of tank contents following hydrostatic testing unlss benzene concentration is less than 1.19 ugA and toluene
concentration is less than I I ug/l.

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A. O. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Permit. No. NC0004839
During the period bcginriing on t effective date of the permit and lasting until expiration, the Pennittee is authorized to discharge
from outfall(s) serial nuinher 002 - eated groundwater. These waters will pass through an approved treatment system prior to
discharge. Such discharges limited and monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement Sample Sample
Monthly, Avg. Daily Max. Frequency T"-e Location
Flow 0.057 MGD Continuous Recording Effluent
Total Suspended Solids 30.0 mg/I Monthly Grab Effluent
Oii and Grease Monthly Grab Effluents
Benzene 1.19 Pg/l Monthly Grab Effluent
Toluene 11.0 pg_h Monthly Grab Effluent
Ethylbenzene Monthly Grab Effluent
Xylene Monthly Grab Effluent
1, 2 Dichloroethane 0.38 µgA Monthly Grab Effluent
Chloroform r 5.7__µgll Monthly Grab Effluent
Phenols = Monthly Grab Effluent
Methyl Tert-But I Ether2 Monthly Grab Effluent
Y
Fluorene Monthly Grab Effluent
Naphthalene Monthly Grab Effluent
Phenanthrene Monthly Grab Effluent
Iron Monthly Grab Effluent
Manganese Monthly Grab Effluent
Footnotes:
1 The grab sample for oil and grease should be skimmed from the surface in a quiescent zone, such as a holding tank, if possible.
2 If MTBE is recorded at levels greater than 200 µg/I, the Mooresville Regional Office Groundwater Section shall be notified.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Part III Permit No. NCO004839
E. ACUTE TOXICITY MONITORING (ANNUAL)
The permittee shall conduct annual toxicity tests using protocols defined as definitive in E.P.A.
Document EPA160014-901027 entitled "Methods for Measuring 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. Effluent samples for self-monitoring purposes must be
obtained below all waste treatment. The permittee will conduct one test annually, with the annual
period beginning in January of the calendar year of the effective date of the permit. 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, DWQ Form AT-1 (original)is to
be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of Water Quality
4401 Reedy Creek Rd.
Raleigh, N.C. 27607
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 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.
Failure to submit suitable test results will constitute noncompliance with monitoring requirements.
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SOC PRIORITY PROJECT: Yes No X
To: Permits and Engineering Unit
Water Quality Section
Attention: Jeanette Powell
Date: February 14, 1996
NPDES STAFF REPORT AND RECOMMENDATION
County: Mecklenburg
MRO No. : 9 6--19
Permit No. NC0004839
PART I - GENERAL INFORMATION
1 . Facility and Address : Charlotte Terminal
Exxon Company, U. S.A.
Charlotte, N.C. 28210
2 . Date of Investigation: 02-13-96
3 . Report Prepared By: Samar Bou-Ghazale, Env. Engineer I
4 . Persons Contacted and Telephone Number: Mr. Mike Slemp, Field
Environmental Specialist with Exxon Company, U.S.A. ; Tel# 704-
529-4272
5 . Directions to Site: Travel northwest from charlotte on
Highway 27 to the Community of Thrift. The Exxon terminal is
located on the left side of Highway 27 approximately 100 yards
past the junction of- Highway 27 and S.R. 1619 .
6 . Discharge Point(s) . List for all discharge points:
Latitude: 35° 16' 40" Longitud 80' 56' 27"
Attach a U.S.G.S. map extract and indicate treatment facility
site and discharge point on map.
USGS Quad No. : F 15 SW USGS Quad Name: Mountain Island
Lake, N.C.
7 . Site size and expansion are consistent with application?
Yes No X If No, explain: Available land for expansion is
limited.
8 . Topography (relationship to flood plain included) : Sloping at
the rate of 3 to 6% . The site is not located in a flood plain.

9 . Location of nearest dwelling: Several houses and businesses
are located within 500 feet of the site. According to Mr.
Gerald Truesdale, Charlotte Terminal Superintendent, Exxon
paid to provide city water to all residents that are within a
1000-foot radius of the terminal .
10. Receiving stream or affected surface waters: Unnamed
Tributary to Long Creek.
a. Classification: C
b. River Basin and Subbasin No. : Catawba 03-08-34
C. Describe receiving stream features and pertinent
downstream uses : The receiving stream appeared to be
headwaters of an unnamed tributary to Long Creek. The
stream flow was low at the time of inspection. There are
no known immediate downstream uses . There are several
other discharges from oil terminal facilities into the
receiving stream.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1 . a. Volume of wastewater to be permitted: 0. 0576 MGD
(Ultimate Design Capacity)
b. What is the current permitted capacity of the wastewater
treatment facility? N/A.
C. Actual treatment capacity of the current facility
(current design capacity) ? 0 .0576 MGD.
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: N/A.
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities : The
existing wastewater treatment facilities for groundwater
remediation consist of an oil/water separator and an air
stripper with a discharge at outfall 001 . The wastewater
treatment facilities for the stormwater consist of a pond
and an oil/water separator which discharges at outfall
002 . The pond receives runoff water from the entire
tank farm site and discharges through the oil/water
separator. The discharge from the loading/unloading area
is also directed to the oil/water separator. Both
outfalls discharges from the same catch basin from two
different pipes .
f. Please provide a description of proposed wastewater
NPDES Permit staff Report
Version 10/92
Page 2

treatment facilities : N/A
g. Possible toxic impacts to surface waters : Discharges of
this nature have been shown to be toxic.
h, Pretreatment Program (POTWs only) : N/A.
2 . Residuals handling and utilization/disposal scheme: Generation
of residuals is not expected.
3 . Treatment plant classification (attach completed rating
sheet) : Proposed, no rating given.
4 . SIC Code(s) : 5171
Primary: 66
Main Treatment Unit Code: 55000 '
PART III - OTHER PERTINENT INFORMATION
I . Is this facility being constructed with Construction Grant
Funds or are any public monies involved (municipals only) ?
N/A.
2 . Special monitoring or limitations (including toxicity)
requests: N/A
3 . Important SOC, JOC or Compliance Schedule dates : (please
indicate) N/A.
4 . Air Quality and/or Groundwater concerns or hazardous waste
utilized at this facility that may impact water quality, air
quality or groundwater? Contaminated groundwater already
exists at the site. GW comments should be obtained. No
hazardous materials will be employed. Air quality permitting
for the air stripper has been handled by Mecklenburg County.
PART IV - EVALUATION AND RECOMMENDATIONS
Exxon Co. , USA is requesting an NPDES Permit renewal for the
discharge of treated groundwater and the discharge of stormwater at
the subject facility.
According to Mr. Slemp the storage tank bottom water is pumped
and hauled in trucks every 3 to 4 months to Baton Rouge, Louisiana,
for disposal . Mr. Slemp also stated that the lagoon has a
compacted clay liner.
NPDES Permit staff Report
Version 10/92
Page 3

Discharge Monitoring reports (DMRs) were reviewed for the
period November 1994 through October 1995 . The reports showed that
the facility was meeting permit effluent limits during this period
except for the month of may 1995, when Toluene and Benzene at
outfall ( 001) were slightly above the daily maximum permit effluent
limits .
It is recommended that the NPDES permit be renewed pending
review by the Groundwater Section.
ignat re 'of�R ort Preparer Date
r'
Water Quality Reg"ronal Supervisor ate
NPDES Permit Staff Report
Version 10/92
Page 4